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Perforation is used in multilayer tissue products, such as toilet and kitchen papers, as part of the converting process. Perforation facilitates the detachment of consecutive sheets by the user. The compromise between the strength required to detach a perforated sheet and the strength required to break a sheet affects the perforation efficiency. In this work, the mechanical behaviors of 15 commercial papers from different European producers were studied. A morphological analysis of the materials was performed, followed by the determination of their perforation efficiency (through tensile tests). A qualitative analysis of the cuts quality, along with a quantitative analysis of the same cuts dimensions was performed through an optical system. Finally, the stress concentration in the holes and the influence of the cuts distance were analyzed using a finite element model implemented in Abaqus/Standard finite element software. The results showed that a cut distance of 2.0 mm should not be used in these types of papers, and the perforation efficiency increased with the cut distance, regardless of the number of plies in the toilet paper. The stress concentration factor was also determined to have a limit value of 0.11. Papers above this limit value tear at the perforation line, as desired.

Background/Aims: The incidence of disease outbreaks in clinical settings arising from ultrasound examinations is well documented, and is a source of worry. The ultrasound transducers and the coupling gel are potential sources of these infections since they come in direct contact with the patient’s skin. In this study, we examine the efficacy of the widespread practice of the use of plain non-sterile tissue paper in some low-cost private ultrasound centres in our locality as a method of disinfecting ultrasound transducers after each use. Its potential impact on nosocomial infection management in clinical practice is also examined. Methods: Swab samples from convex ultrasound transducers before and after transabdominal scanning of three consecutive patients were obtained from 10 different ultrasound centres in urban and rural areas of Enugu state. Ultrasound coupling gel samples were equally obtained, and all samples cultured for bacteria growth which was quantified in colony-forming units per ml (CFU/ml) and reported in 1000/ml. Paired sampled t-test was used to check for significance in a reduction in a bacterial load before and after the transducer was cleaned. Results: Nine different bacterial strains were isolated. Staphylococcus aureus and Klebsiella spp had the highest percentage of occurrence in all centres. Significant bacteria growth was recorded in the morning before the examination, and plain tissue paper significantly reduced the bacteria load in the ultrasound transducer. Conclusion: Even though disinfecting ultrasound transducers with non-sterile plain tissue paper alone is statistically effective and has the potential to minimize nosocomial infection, it is however not clinically effective and hence not advised.

Abstract Tissue paper softness relies on two major factors, the bulk softness, which can be indicated by the elasticity of the sheet, and surface softness. Measurement of surface softness is complicated and often requires a multi-step process. A key parameter defining surface softness is the topography of the surface, particularly the crepe structure and its periodicity. Herein, we present a novel approach to measure and quantify the tissue paper surface crepe structure and periodicity based on the detection of waviness along the sample using laser scanning confocal microscopy (LSM) and X-ray tomography (XRT). In addition, field emission scanning electron microscope (FESEM) was used to characterize the tissue paper surface. We demonstrate that surface topography is directly correlated to the erosion of the doctor blade, which is used to remove the dry tissue paper from the Yankee cylinder. Because of its accuracy and simplicity, the laser confocal microscopy method has the potential to be used directly on the production line to monitor the production process of the tissue paper. XRT revealed more structural details of the tissue paper structure in 3D, and it allowed for the reconstruction of the surface and the internal structure of the tissue paper. Graphic abstract

Tissue paper conversion consists of the transformation of base tissue papers into finished tissue products to meet specific demands. When base tissue paper arrives at the converting line, it already holds different requirements that were met during its manufacture in the paper machine (e.g., grammage, bulk, tensile index, etc.). However, what happens during converting can still influence the performance and quality of the finished products. The current work addresses this topic and aims to evaluate the influence of converting conditions on the final softness. For that, two 5-ply finished tissue products were analyzed using different methodologies for their proper characterization in terms of softness and surface analysis. The analyzed products are composed by the same base tissue papers, but some changes were applied on their settings in the converting line. In particular, the base tissue papers arrangement and the embossing pressure affected the finished products, resulting in one of them being softer and more pleasant to touch, with a global handfeel (HF) value of 75.3 units, and the other revealed to be rougher and less pleasant, with a global handfeel (HF) value of 68.0 units.

Tissue paper production frequently combines two main types of raw materials: cellulose fibers from renewable sources and polymer-based additives. The development of premium products with improved properties and functionalities depends on the optimization of both. This work focused on the combination of innovative experimental and computational strategies to optimize furnish. The main goal was to improve the functional properties of the most suitable raw materials for tissue materials and develop new differentiating products with innovative features. The experimental plan included as inputs different fiber mixtures, micro/nano fibrillated cellulose, and biopolymer additives, and enzymatic and mechanical process operations. We present an innovative tissue paper simulator, the SimTissue, that we have developed, to establish the correlations between the tissue paper process inputs and the end-use paper properties. Case studies with industrial interest are presented in which the tissue simulator was used to design tissue paper materials with different fiber mixtures, fiber modification treatments, micro/nano fibrillated cellulose, and biopolymer formulations, and to estimate tissue softness, strength, and absorption properties. The SimTissue was able to predict and optimize a broader range of formulations containing micro/nanocellulose fibers, biopolymer additives, and treated-fiber mixtures, saving laboratory and industrial resources.

Tissue paper is defined by its physical and mechanical properties, namely: high softness, low grammage, high bulk and high liquid absorption capacity. It is expected that the production of tissue paper will continue to grow, which increases the importance of better understanding the processes involved in its production as well as its optimization [1] . The experimental data presented in this article, are the physical-mechanical characterization of a group of 13 industrial base tissue papers, which were collected at the end of the tissue paper machine on Portuguese factories. These samples vary in grammage, composition and creping [2] , enabling a later evaluation of the crepe type [3] and its relationship with the final properties of the tissue paper.

With the surging energy price and environmental concerns, measures to improve energy efficiency have attracted increasing concerns of the manufacture sector, especially energy-intensive manufacturing industries such as tissue paper mills. Energy-efficiency scheduling, as a novel energy-efficient method, has attracted the attention of an increasing number of researchers in recent years. Drying process is the most energy-intensive production process in tissue paper mills, which has a great energy-saving potential. This paper aims to reduce the energy costs for the tissue paper mill, consisting of processing energy cost and set-up energy cost, through integrating drying process optimization with energy-efficient scheduling. First, the energy cost model and the scheduling model were built. Then, the energy cost of the drying process of every job in a given scheduling problem was optimized using particle swarm optimization (PSO). Afterwards, the energy cost was further optimized using energy-efficiency scheduling. In addition, a hybrid non-dominated sorting genetic algorithm II (NSGA-II) was utilized to solve the energy-efficiency scheduling problem. Finally, several real scheduling problems from a real tissue paper mill were addressed using the proposed approach to demonstrate its effectiveness in energy saving. The experiment result showed that there is a great energy-saving potential in the drying process, accounting for up to 12.53% of the total energy consumption. Moreover, the maximum energy saving ratio of the proposed approach could reach 9.03%. On the whole, the proposed approach can provide a new energy-saving method for tissue paper mills or other manufacturing industries.

In remote areas, such as India, Africa and Southeast Asia, typically not connected to the natural gas distribution network, tissue paper production is currently carried out using a Yankee cylinder and two hot air hoods heated with saturated steam produced in conventional boilers. In this way the drying air is heated at medium temperature, around 160-180 °C, with consequent low levels of dried paper production. In this context, the present study intends to evaluate the technical and economic feasibility of using a wood biomass fixed bed downdraft gasification plant for the production of syngas to be used as fuel in gas hoods, in order to reach high drying temperatures (around 500 °C), comparable with those of the current modern hoods powered with natural gas. Using previously developed calculation codes, an evaluation of energy performance of the paper drying system and of the gasification plant has been performed. The present study also evaluates the possibility of applying a CHP plant, powered by biomass, for the production of steam and electric, this last obtained adopting a steam turbine, thus covering all the electrical and thermal needs of the paper mill. Results show that, for a paper mill with a production of about 80 t/day of paper, two gasification reactors with a thermal output of about 1.95 MWt, and a consumption of dry biomass of 0.86 t/h, are required. For the steam system, the net electric power needed to meet the needs of the paper mill is about 3100 kW with a consumption of 4.72 t/h of moist biomass and a net efficiency of 23.9 %.

This study aimed to identify the performance properties that drive the shelf price of kitchen paper towels and evaluate whether sustainability is an important driver for pricing. Nineteen products were compared according to their performance (softness, absorbency, and strength), technology, and fiber morphology. Metrics to rank the products in different grades (economy, premium, and ultra) according to their performance were provided. A multiple linear regression showed that absorbency and softness are the most significant properties used to predict the price. Market data indicates that there is a segment of consumers willing to pay a premium price for products marketed as “sustainable”, even though their performance is comparatively inferior to the majority of the samples. Sustainable products are up to 85% more expensive than regular products. The metrics obtained in this work can contribute to improvement in market transparency, and aid companies in deciding strategies for product development and new investments.

Electricity consumption and material wastage of manufacturing industries have directly or indirectly influenced the environment. Many manufacturing enterprises are committed to improving energy and material efficiencies. To achieve this goal, one of the high-efficiency ways is to optimize the scheduling. In this study, a multi-object optimization model is constructed for a particular kind of batch processing scheduling problem existed in flexible flow shops, where the objects include makespan, electricity consumption and material wastage. First, the models for electricity consumption and material wastage are built, based on which a mathematic model for scheduling problem is built afterwards. Finally, a hybrid non-dominated sorting genetic algorithm II (NSGA-II) method is employed to solve the multi-object optimization scheduling model. A case study based on a real-world paper mill industry is presented to demonstrate the effectiveness of the method and its application in practice. Moreover, a real-life scheduling problem is investigated, and the result shows that the proposed method is more efficient than manual scheduling in energy and material saving. In fact, many tissue paper mills or other manufacturing industries schedule by manual labor in China, indicating that the proposed method has a significant potential in improving energy and material efficiencies in the studied flexible flow shop, and in energy and material saving in similar industries.

At present, the tissue paper manufacturing is mostly based on the dry crepe technology. During the last decade, the manufacturers have introduced new tissue machines concepts that increase the softness, bulk, and absorption capacity. Such machines produce a strong regular three-dimensional (3D) structure to the sheet before the Yankee cylinder. At present, the quality of the 3D structure is not evaluated, or it is evaluated only subjectively at the mill. This is mostly because of the difficulties to separate reliably the regular 3D pattern from other variations. This paper introduces a frequency analysis based method which separates the surface profile variances in tissue paper to the creping, to the regular 3D pattern and to the residual variation. The 3D surface profiles and their variances were determined online with the photometric stereo method. We show that the introduced analysis method evaluates the variance portions reliably and the results are consistent with the visual perception of the 3D surfaces. In one particular product, the regular 3D pattern explains 74 % of total surface variance; the creping explains 10 % and residual variations 16 %. Furthermore, the creping and residual variances are quite stable over time whereas the variance of the regular 3D pattern fluctuates significantly.

When portability, low cost, and green energy requirements are considered, the search for an electricity generator harvesting environmental energy based on available cheap commercial materials and simple fabrication techniques becomes significantly important. In this study, the capability of ultrasoft and cuttable paper-based triboelectric nanogenerator (P-TENG) to harvest mechanical energy is demonstrated. The P-TENG maintains the excellent softness of tissue paper and has the characteristics of light weight (~ 87 g/m2), high electric conductivity (6 Ω/square), and low cost (~ $3.00/m2). More importantly, the P-TENG can be cut by the end-user to modify its size and shape and still function properly. The mechanical energies available during cleaning processes, the energy associated with the body's motion, sound energy, and wind energy can be directly harvested by using the P-TENG. The high portability of the P-TENG, the simple and scalable fabrication processes, low cost, and its ability to harvest mechanical energy make the P-TENG important for the development of green, portable, energy-harvesting devices.

To relief the water shortage crisis in China, the Chinese government has initiated a series of clean production (CP) measures to reduce the freshwater consumption and wastewater discharge from paper industry. In this study, a new CP technology was introduced in the paper industry to reuse tissue paper mill effluent water as intake water of corrugated paper mill. The feasibility and impact of the new CP technology was investigated in three different scales, laboratory experiments, pilot-scale testing, and long-term implementation. Results show that the water quality of treated tissue paper mill effluent water is competitive with that of freshwater and some water quality indexes are even better, indicating that treated tissue paper mill effluent water is a suitable alternative to replace the freshwater as intake water for the corrugated paper mill. By reusing tissue paper mill effluent water as intake water of corrugated paper mill, most physical properties of different corrugated paper layers are improved or similar as those by using freshwater as intake water in all different scale experiments. Moreover, the new CP technology significantly reduced the freshwater consumption for the corrugated paper mill, eliminated the wastewater discharged from the tissue paper mill, and at the same time, lowered the operation cost for both paper mills in terms of freshwater consumption and wastewater treatment cost. Total 216,000 RMB will be saved every year with an assumption that tissue paper mill provides annual daily average 2000 cubic meter of effluent water to corrugated paper mill every day. © 2017 American Institute of Chemical Engineers Environ Prog, 2017

Electronics based on paper substrates can be foldable, inexpensive, and biodegradable, making such systems promising for low-cost sensors, smart packaging, and medical diagnostics. In this work, we saturate tissue paper with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) by using a simple and scalable process and construct pressure sensors that exhibit an enhanced response when the active material is folded or stacked. Nanoscale pressure actuation and current mapping reveals a sensing mechanism that takes advantage of the fibrous microstructure of the paper and relies on the formation and expansion of electrical contacts between fibers in adjacent paper layers as pressure is applied. The resulting paper-based pressure sensors respond to an impulse within 20 ms and are robust, showing only a 4.6% decrease in the operating current after 30 000 load/unload cycles. Pressure distribution mapping was achieved by using a sensor array with a stacked architecture, whereas folding was used to demonstrate multistate switching and to detect conformational change in a three-dimensional origami system. These strategies of folding and layering paper saturated with functional materials open up new avenues for building multifunctional paper electronics.

The drying process accounts for the largest proportion of energy consumption in paper mills. Energy system optimization has a great significance for reducing the energy consumption of the paper drying process. The drying process is a complex system that consists of several subsystems, such as cylinder and air hood systems. Previous optimization models for energy systems usually focused on these subsystems. A global optimization methodology for the entire drying process is lacking, and no existing models can be applied in practice. In this work, an energy system optimization model for the tissue paper drying process is proposed based on a process simulation model. The modeling process integrates the various subsystems and fully considers the coupling of the paper drying process, which greatly enhances the industrial application value of the model. Industrial operating data are used to test the simulation model, and the results show that the simulation error of each key variable is within 5%, which meets the real-world production requirements and lays the foundation for an energy efficiency analysis of each subsystem. Applying the optimization model to a tissue paper mill, the results show that it can reduce drying costs by 8.71%.

Environmental concerns and soaring energy prices have brought huge pressure of energy saving and emission reduction to tissue paper mills. Electricity is one of the main energy sources of tissue paper mills. The production characteristics of tissue paper mills make it easy to decrease energy cost by using time-of-use (TOU) electricity tariffs. This study investigates the bi-objective energy-efficiency scheduling of tissue paper mills under time-of-use electricity tariffs, the objectives of which are makespan and energy cost. First, considering the processing energy cost, setup energy cost, and transportation energy cost, an energy cost model of a tissue paper mill under TOU electricity tariffs is established. Second, the energy-efficiency scheduling model under TOU electricity tariffs is built based on the energy cost model. Finally, on the basis of decomposition and teaching&ndash, learning optimization, this study proposes a novel multi-objective evolutionary algorithm and further combined with the variable neighborhood search to solve the problem. The case study results demonstrate that our study of tissue paper mill energy saving is feasible, and the proposed method has better performance than the existing methods.

In this paper an original and exhaustive mathematical modelling of air impingement drying systems for the production of tissue paper in the Yankee-hoods configurations is reported, which offers the possibility to optimize its energy performance. The model takes into account many detailed operative parameters of the overall drying process with the aim to execute its energy and mass balance and to evaluate its energy performances. The validity of the mathematical model has been assessed by comparison with actual data from an existing tissue paper mill. Finally, the energy performances of two different layouts of the air system have been evaluated and compared. Changing the operative parameters of the drying process, such as air jet temperature and speed and moisture content of the extraction air, it is possible to obtain the same paper production with an energy saving of about 4.5%. In average, the layout with two parallel air circuits assure an energy saving of about 1% with respect to the layout with a single air circuit.

High-performance electronics demand extremely sensitive piezo-resistive sensors with important features such as low-fabrication cost, easy implementation, low power consumption and high-pressure sensitivity over broad pressure range. Herein, we report a flexible piezo-resistive paper-based device functionalised by WSe2 nanosheets. An efficient and low-cost fabrication strategy using Whatman filter paper and tissue paper is adopted for versatile sensing applications. The WSe2 nanosheets were synthesized by high-yield and size-controlled liquid phase exfoliation technique. The flexible WSe2 nanosheets-paper sensor shows excellent response in broad pressure range of 1 Pa-100 kPa with exceptionally high sensitivity of 29.24 kPa-1, current responsivity of 70 and response time of 100 ms. The pressure sensor is also employed to recognize the pressure generated due to finger tapping. Encouragingly, the piezo-resistive sensors can also sense extremely small pressure differences of about 1.4 Pa generated by water drops.

Received: 22 April 2015 Abstract Accepted: 7 July 2015 The aim of this work is to compare the environmental impacts of two production processes of tissue paper using virgin pulp (virgin fiber) or waste paper pulp (recycled fiber). This comparison is based on the materials and energy used as well as emissions and waste resulting from the production of tissue paper. Life cycle assessment (LCA), ReCiPe method, was chosen as the analysis tool. The results of the research proved that electricity has the most considerable participation in the overall environmental impacts in both production processes, followed by either virgin pulp or heat. Consequently, these two production processes are the greatest contributors to the following midpoint environmental impact categories: human toxicity, climate change, human health and ecosystems, and fossil depletion. The analysis based on endpoint impact categories proved that the production process based on waste paper is more environmentally friendly than the one based on virgin pulp in all impact categories: human health, ecosystems, resources. This is largely because of its lower material and energy requirements in the entire life cycle. Due to the fact that the tissue paper is the final use of fiber, using recycled waste paper is strongly recommended. The obtained research results are a valuable source of management information for the decision makers at both company and national levels required to improve the environmental performance of tissue paper production.

The stock approach system of Chinese high speed tissue paper machines and the configuration of measuring and control points are specified. After introducing the control of absolute dry pulp quantity, the control scheme of Fuzzy-PID composite is implemented. The application result indicates that the scheme proposed is feasible and effective

The light inspection on surface finishing of most product measurement is an important feature in the industries. In this study, a lab module tester for examination on the different type quality of tissue paper quality was done. The light reflectance element was used in this study to differentiate the quality of tissue paper. The laser diode and photodiode was used as manipulator to differentiate the tissue paper and photo detector to detect the reflected light from the surface of tissue paper. The both of laser diode and photodiode were placed in a light box. Different level of intensity reflected from the surface material will have different voltage output. The result showed that the total ply high quality tissue paper has a higher reflected voltage output compared to low quality tissue paper.

Tissue production is largely dependent on the creping process as creping influences the paper properties and thus the quality of the end product and the runnability of the tissue machine. The proce ...

Purpose The aim of this work is to compare greenhouse gas (GHG) emissions from producing tissue paper from virgin pulp (VP) or recycled waste paper (RWP). In doing so, the study aims to inform decision makers at both company and national levels which are the main causes of emissions and to suggest the actions required to reduce pollution.

Handle has a primary influence with nearly everything surrounding us as it gives the essential information to interact with our neighbourhood. The need to know how this affects our decisions is fundamental and leads to the study and understanding of this human sense. Tissues paper is one of the most common elements of interaction in the day-to-day human life; it can be produced in various ways leading to different textures which can transmit various sensations. The FRICTORQ® is a laboratory equipment developed by the authors to measure the friction coefficient in fabrics, to enable a quantitative assessment of touch/handle, in order to predict the comfort behaviour of 2D/3D structures when used or touched by humans.In the present study the existence of a correlation between a subjective assessment and the objective measurement of different parameters analysed in paper tissues has been investigated.

This chapter deals with materials and surfaces that do not respond well to standard processes or to processes that are not mainstream as of yet. Using standard protocols on thermal paper cause the paper to darken exceedingly, making recovery very difficult (if not impossible). A fingerprint on skin is another area where no particular process has been shown to have consistent results. Tips on processing latex or nitrile gloves and objects from fires, including techniques for general soot removal and soot removal from blood prints, is discussed. The recovery of fingerprints from difficult surfaces, such as Kleenex or tissue paper, rough or textured surfaces, desiccated remains, wet or submerged evidence, and touch DNA are examined. The recovery of fingerprints from firearms and casings are explained, and the results of a study on the success of fingerprint recovery off of firearms and casings are included. Additional processes are explained to make the reader aware of their existence.

Hand towel is one kind of disposable tissue paper which has characteristic of soaking up water quickly and lower cost. It becomes increasingly popularity in families, at work, and public places. There are many kinds of raw materials to produce hand towel according to its level. Some researches showed that bleached chemical pulp could be partially used to the production of hand towel and some other household paper. In this study, some kinds of raw material which be used to produce hand towel were analyzed and trying to looking for new one. Poplar Extruding Mechanical Pulp (EMP) had characteristics of long fiber, high level of strength and brightness. Different ratio of poplar EMP and certain Bleached Kraft Pulp were tested to make hand towel. The effects of poplar EMP on whiteness, tensile strength, bulkiness, absorbability were discussed. The results showed that characteristic targets of hand towel made from poplar EMP and Bleached Kraft Pulp met the quality requirements of GBT22455-2009 and satisfied the high-end hand towel. The new hand towel had lower cost, higher stiffness and higher bulkiness. It was feasible from the technique and economy point.

The key operation in tissue production is the creping at the Yankee cylinder. The tissue sheet is adhered to a Yankee cylinder and then detached from the surface with a blade. As a result a strong microstructure - crepe folds - is generated on the web. In this work the structure of creping pattern in CD and MD of tissue paper was studied. The samples available in this work consisted of bath tissue and towel grades. The significant difference between the samples was in the number of crepe folds. The tissue sheets were analyzed with an imaging system. The variation of crepe folds in images was studied in spatial frequency space through 2D Welch spectrum. It was noticed that the difference in creping pattern structure between the samples can be seen clearly in spectra. The creping pattern was simulated based on the creping pattern variation found from the Welch spectra of tissue paper images. The simulation was based on a set of sinusoidal terms representing several orientations and amplitudes. The amplitudes of sinusoidal terms located in regular grid in spectra were approximated with 2D normal distribution. Thus, the structure of creping pattern can be represented with three parameters originating from the deviations and location of 2D normal distribution. The creping pattern reconstructed with simulations contains the relevant features in the creping pattern of true tissue images.

Research of fed batch saccharification using paper mill primary sludge from Waste Water Treatment Plant (WWTP) has been conducted. The research was conducted in several stages i.e. sludge characterization, determining optimum dosage of cellulase and glucosidase through batch saccharification , and continued with fed batch saccharification . The characterization was performed on 3 primary sludge type from 3 paper mill, which are print paper mill with virgin pulp raw material , paper tissue mill with virgin pulp raw material and core board mill with waste paper raw material . The characterization results showed that the sludge derived from the tissue paper mill with virgin pulp raw material has the highest content of cellulose which is 47.06% , this sludge wa s used as further research material. The initial trial of batch saccharification at 6% w/w and temperature of 60 o C gave optimum dosage of cellulase 9 FPU/g cellulose and β-glucosidase 80 IU/g cellulose with reducing sugar 20.01 g/L and a saccharification efficiency of 63.84% . Fed batch saccharification was performed on tissue paper mill sludge at cellulase and glucosidase enzyme doses respectively 9 FPU/g cellulose and 80 IU/g, temperature 60°C and initial pH of 4 with t wo variables , which are cumulative solid content (10%, 14%, and 18% w/v) and feed enzyme system (at the beginning and in step ). The best results were obtained at fed batch sakarifikasi with gradual enzyme feeding at 14% solids content resulting in reducing sugar 43 . 899 g/L and efficiency 60 . 03% .

This paper considers an industrial scheduling problem. It involves profit maximization and the determination of the optimal cycle time, while meeting the minimum demands for the several products. Resource-Task Network-based formulations are employed and a detailed comparison between continuous- and discrete-time models is provided. Both have the improved capability of handling tasks with flexible proportions of input materials in order to consider the incorporation of different flowrates of byproducts that are recycled back to the first production stage. The continuous-time formulation is shown to be more efficient and the resulting mixed integer nonlinear program (MINLP) can be solved to optimality within reasonable computational time. A new recycling policy is proposed that achieves the double goal of making the process more profitable due to important savings on the more expensive raw-materials and also more environmentally friendly, due to the reduction of waste disposal requirements.

A model of an industrial through-dryer for production of tissue paper was developed. The model can be used to predict the performance of a dryer section of an industrial through-drying machine consisting of one or more through-drying rolls separated by free draw sections. Roll diameters, wrap angles, machine speed, basis weight, initial paper moisture ratio, operating pressure differentials, drying air temperatures, and drying air humidity are input parameters to the model. Based on the input information, the model predicts paper drying rate, paper moisture ratio, paper temperature, exhaust air humidity, exhaust air temperature, and air flow rate as a function of time, which at a given machine speed is equivalent to a certain position in the machine direction of the dryer. The model also includes a description of the fabric and along with the paper properties the model also predicts fabric drying rate, fabric moisture ratio, fabric temperature, and fabric air humidity as a function of time (or position). Air, vapor, and enthalpy fluxes were integrated over the residence time of each through-drying roll in order to retrieve the average flow rate and air properties of the air leaving each roll. These data were then used in a steady-state description of the air system of each roll, which means that, for given drying conditions, natural gas consumption in the burners and the fan power associated with each roll can be predicted. The model was used to study how the different operating conditions affect the energy demand and economics of the through-drying process. The simulation results indicate small differences in total drying cost for different operating conditions. Reduction of fabric water was shown to have a relatively large impact on overall drying cost. Reducing the initial fabric moisture ratio from 0.019 to 0.012 kg water/kg dry solids reduced total operating costs by approximately 3.3%.

This paper describes a full-scale physical model and its application to investigate the effectiveness/performance of small-bore sewers for a range of operational and design parameters. The implementation methodology involves observing the movement of synthetic gross solids in three small bore sewers (150, 100 and 75 mm diameter) for different volumes of simulated flush waves and gradients. The simulated flush waves were generated, using an automated wave sequencer, for three different flush volumes (3, 4.5 and 6 litres). To investigate the impact of solid shape factor, a number of tests were carried out using synthetic solids in combination with toilet tissue paper. In total, more than 1,000 tests were performed for different operational and design parameter combinations. Results obtained to date have confirmed earlier studies, particularly with respect to the role of flush volume in solids transport, and identified the impact of gradient variation and its significance particularly in small-bore sewers receiving low flush volume. Results from the physical model application exercise will be used to propose new design guidelines for wastewater collection systems with specific consideration to new developments and inform the decision support system, currently being developed as part of a research project on water cycle management for new developments (WaND).

A kind of tissue paper used in industrial applications for Puer tea packaging was studied. The properties of tissue paper surface which were detrimental to printability were tested. Particular attention was paid to pore rate which was affected mainly by the structure of tissue paper surface and to find correlation between their surface properties and their printability. Tissue paper for Puer tea packaging should have high pore rate because Puer tea needs ferment. Results indicated that tissue paper had a high pore rate and pores on the tissue paper arrange compactly without order. Tissue paper was printed with offset fast-drying inks to examine the conditions of color reproduction. The immediate objective of this study was to investigate surface properties of tissue paper and printability and to find which kind of press product tissue paper adapted to. Introduction Paper printability is variable property which is according with press conditions and printing characters [1-3]. Tissue paper for Puer tea packaging belongs to uncoated paper and fibers arrange out of order and sparsely. Tissue paper has good toughness, water absorbency, vapor permeability and pliancy. These characteristics make tissue paper adapt to Puer tea packaging. Printing process becomes difficult because tissue paper fibers range sparsely and have too strong ink absorption. When inks from plate meet substrates, a colored organic pigment in inks will penetrate into tissue paper rapidly. Studies of the effect of the coating pore structure on ink setting rate have been widely published in recent years [4–7]. But tissue paper printing can not form a certain ink film thickness and get perfect optical density. Colors of print image will become dim, and multi-color printing occur bad trapping easily. The main aim of our study was to obtain the surface properties of tissue paper and printability and to find which kind of press product tissue paper adapted to.

В работе приведены результаты исследований практического применения перемешивающего аппарата профилированной формы с ротором геликоидального типа на основе определения физико-механических и гидрофильных свойств санитарно-гигиенической бумаги, обеспечивающих эксплуатационные качества санитарно-гигиенических изделий.Полученные результаты исследований показали, что применение перемешивающего аппарата профилированной формы с ротором геликоидального типа для подготовки композиции бумажной массы обеспечивает создание определенной гидродинамической обстановки в рабочей полости аппарата, позволяющей до минимума снизить возможность появления застойных зон как статического, так и динамического типа и уменьшить гидравлические потери вдоль траектории движения потока жидкости. Это, в свою очередь, ведет к максимальному увеличению степени циркуляции и равномерному распределению концентрации волокнистой суспензии для подготовки композиции бумажной массы, обеспечивающей получение требуемых физико-механических и гидрофильных свойств бумаги санитарно-гигиенического назначения при сравнительно низких затратах удельной электроэнергии., The paper presents the research results of practical application of mixing apparatus of profiled form with the rotor helical type based on the definition of physico-mechanical and hydrophilic properties of tissue paper, providing the performance of sanitary-hygienic products.The obtained results showed that the application of the mixing apparatus of profiled form with the rotor helical type for preparing the compositions of the paper pulp ensures the creation of a particular hydrodynamic environment in the working cavity of the device, allowing to minimize the possibility of stagnant zones both static and dynamic type and to reduce hydraulic losses along the trajectory of the fluid flow. This, in turn, leads to the maximum increase in the degree of circulation and uniform distribution of concentrations of fibrous suspensions for the preparation of the composition in paper pulp, providing the required physico-mechanical and hydrophilic properties of paper for sanitary purposes at a relatively low cost unit of electricity.

The rate, quality and economics of printing process are tightly linked to the characteristics of printing technology and materials used. Paper printability is variable property which is according with press conditions and printing characters. A kind of tissue paper used in industrial applications for Puer tea packaging was studied. Tissue paper for Puer tea packaging should have good air permeability because Puer tea needs ferment. Ink receptivity is one of the most important properties of tissue paper in terms of the print quality. The ink receptivity is too strong and ink will not set onto the paper, which make poor color and tone reproduction. Tissue paper was printed with offset fast-drying inks to examine the conditions of tone reproduction, color reproduction and dot gain which determined the printing quality. The immediate objective of this study was to investigate dot gain and tone reproduction of tissue paper.

Context: Decontamination of various working surfaces with sodium pertechnetate minor spillage is essential for maintaining good radiation safety practices as well as for regulatory compliance. Aim: To observe the influences of decontaminating agents and swipe materials on different type of surfaces used in nuclear medicine laboratory work area wet spilled with 99m-technetium (99mTc) sodium pertechnetate. Settings and Design: Lab-simulated working surface materials. Experimental study design. Materials and Methods: Direct decontamination method on dust-free lab simulated new working surfaces [stainless steel, polyvinyl chloride (PVC), Perspex, resin] using four decontaminating agents [tap water, soap water (SW), Radiacwash, and spirit] with four different swipe material [cotton, tissue paper (TP), Whatman paper (WP), adsorbent sheet (AS)] was taken 10 samples (n = 10) for each group. Statistical Analysis: Parametric test two-way analysis of variance is used with significance level of 0.005, was used to evaluate statistical differences between different group of decontaminating agent and swipe material, and the results are expressed in mean ± SD. Results: Decontamination factor is calculated after five cleaning for each group. A total of 160 samples result calculated using four decontaminating agent (tap water, SW, Radiacwash, and spirit), four swipe material (cotton, TP, WP, and AS) for commonly used surface (stainless steel, PVC, Perspex, resin) using direct method by 10 samples (n = 10) for each group. Conclusions: Tap water is the best decontaminating agent compared with SW, Radiac wash and spirit for the laboratory simulated stainless steel, PVC, and Perspex surface material, whereas in case of resin surface material, SW decontaminating agent is showing better effectiveness. Cotton is the best swipe material compared to WP-1, AS and TP for the stainless steel, PVC, Perspex, and resin laboratory simulated surface materials. Perspex and stainless steel are the most suitable and recommended laboratory surface material compared to PVC and resin in nuclear medicine. Radiacwash may show better result for 99mTc labelled product and other radionuclide contamination on the laboratory working surface area.

Characterization of an artificial denture is required to give the denture a more natural appearance. This article describes the laboratory procedures for internal characterization of denture base in a removable prosthesis using acrylic stains and absorbent tissue paper incorporated in the heat cure polymerizing denture base resin at the stage of packing.

The drying process influences the product quality. Additives are introduced into the product to further improve the quality. But the additives remain in the final product. A novel technique is presented which suggests the introduction of a volatile additive into the drying air. Small amounts will condense on the moisture and will react. Thus, an effect on the quality may be achieved. After drying, no additive remains in the product due to its volatility. It can be recycled. As an example, we present the reduction of strength of paper and therefore an increase in softness by adding alcohol to the drying air. A short calculation shows the effect that may be expected. Experimental investigations verify the predicted effect.

Dermabrasion remains one of the effective ways to treat scars and facial wrinkles. Spot dermabrasion is for a localized limited area. Bleeding and oozing from the abraded wound are cumbersome during the operation. Small pieces of tissue paper were used for the intraoperative hemostasis. The efficiency and safety of the tissue paper as a temporary dressing for hemostasis was discussed and presented. It is simple, cost-effective, and easy to use for hemostasis from spot dermabrasion.

This is a translation of the captioned paper jointly presented at the Tissue Symposium held in Munich, Germany on April 17, 1991.Multi-layer tissue production can control the paper quality with more flexibility than the conventional technology. The structure of the headbox as well as the operating results at the papermill are introduced.

The need for more rational use of water also calls for more efficient usage. An example is the production of tissue paper, where large amounts of water are discharged into the drain because its turbidity does not allow for recirculation. While this is a serious problem, even worse is the fact that the quality of such wastewater makes it difficult not only to recirculate but also to discharge due to environmental law restrictions. In this paper, electrocoagulation is proposed as a suitable technology to meet standards of water discharge, and even better, as a treatment option for removal of turbidity. Since energy consumption has been a drawback for EC applications, relevant aspects that contribute to increase it such as cell voltage and current density have been reviewed. For this purpose a systematic micro-electrolysis study combined with macro-electrolysis experiments have provided evidence that shows it is possible to achieve a turbidity removal of 92% with an energy consumption of 0.68 kWh/m 3 . Thus, the results presented in this paper support the use of EC to obtain water of acceptable quality for reuse in the tissue paper industry.

Aikawa has had rich experiences for deinking technology from toilet paper, tissue paper to news papers, printing paper and respond to various deinking requirements. The biggest subject in a deink plant is how to treat difficult deink printed paper and solve sticky problems. The removal of the contaminants by excellent screening facilities without cutting of impurities, …… Aikawa's deink systems are made by various combinations of superior technologies of Helipoire, coarse and fine screening, and light weight impurity cleaner. Difficult deink printed paper, with high brightness and quality deinked pulp can be produced by the combination of superior defibering and ink dispersing accomplished by the Helipoire, Dispersion and deinking by the DA-Verticel.

In this paper, two novel techniques developed by the authors to measure certain quality variables in paper manufacturing are described. These methods are based on the new online image sensors for digital image processing of paper samples. The techniques use the two dimensional Fourier transform of the original images to estimate basically two variables: the floc size distribution in paper formation and creping of tissue paper. In the first case, a new method to estimate the floc size distribution in paper is presented. The method computes only a reduced portion of the spectrum to determine, in frequency, the floc sizes present. The technique to measure creping gives the degree of roughness that has been induced on the tissue paper by looking also at its power spectra distribution. This characteristic is essential in determining the smoothness of tissue paper. >

This paper describes a novel sensor designed to provide information on some basic variables of paper during its manufacture. Depending on the type of grade, the instrument is easily configurable to measure anyone of three variables, namely: dimensional variations of paper (shrinkage), flocculation and creeping (tissue paper). The paper presents the basic concepts behind each technique used and describes the human interfaces of this equipment. Finally, the problem of spectral rotation due to camera misadjustments is addressed. >

Publisher Summary This chapter discusses some of the useful robot stuff, such as a floor sweeper. This robot is based on the principle that a vehicle moving randomly about a room will eventually touch every point of the floor. This robot is simply a differential drive that in place of supporting casters mounts a relatively large wiper, wrapped in a piece of tissue paper. Wiper is made from three layers of different materials: LEGO plates (on top), a thin sheet of foam rubber, and tissue paper. The foam rubber is attached to the plates with a small piece of double-sided adhesive tape. The tissue paper, easily replaceable, covers the foam rubber and then folds over the top of the plates to be pinned between them and four 2 x 2 plates. The projects discussed in this chapter are: the Floor Sweeper, Milk Guard, and the Plant Sprinkler, which provide a starting point for talking about some offbeat capabilities, like pumping water. In fact, the Plant Sprinkler shows an unusual application of the LEGO pneumatic system.