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A full-cellulose derived hydrogel, composed of carboxymethyl cellulose (CMC) and nanofibrillated cellulose (NFC), was successfully manufactured and immobilized with Pd/Fe bimetallic nanoparticles for the dechlorination of 2,4,6-trichlorophenol. The NFC-reinforced CMC hydrogels with or without loading of bimetallic nanoparticles were characterized by Fourier transform infrared spectroscopy, Transmission electron microscopy, Scanning electron microscopy-energy dispersive X-ray, and X-ray diffraction analyses. The effect of amounts of NFC on the loading capacity of Pd/Fe, mechanical properties and specific Brunauer-Emmett-Teller surface areas of NFC-reinforced CMC hydrogel was also investigated. The experimental results showed that Pd/Fe bimetallic nanoparticles were dispersed and fixed in the hydrogel matrix with the nanosize spherical shape. The hydrogel would protect the Pd/Fe nanoparticles from oxidation, and thus providing long-term stability in comparison with only NFC-coated Pd/Fe nanoparticles. The hydrogel loaded with Pd/Fe nanoparticles, as a soft material catalytic system, was investigated to dechlorinate 2,4,6-trichlorophenol and was found to be very effective.

This paper proposed a new method for the determination of the viscosity average molar mass of guar gum, based on a volatile tracer assisted twice headspace extraction gas chromatographic technique. The feasibility study showed that n-butanol was a suitable tracer to be used in this method. The results showed that the present method had a good precision (with the relative standard deviation

NaOH-based hydrolysis of epoxypropyltrimethylammonium chloride (ETA) was carried out in a batch reactor using ethanol/water system. The analytic technique, headspace-gas chromatography, was employed in order to follow the time evolution of ETA aqueous solution. Various effects on hydrolysis degree, such as, molar ratio of ethanol/water, NaOH concentration, reaction temperature, and dosage of hydrolysis product (2,3-dihydroxypropyl trimethylammonium chloride) were investigated. And then the kinetic model of the hydrolysis of ETA was developed and the possible mechanism of nucleophilic ring opening reaction was proposed. Furthermore, the model parameters of the process were also determined by data fitting. The results show that ETA hydrolysis follows the pseudo-first order law and kinetic model agrees well with the experimental results. Therefore, based on this kinetic model we could control the hydrolysis degree of ETA during ETA-involved cationic etherification of natural polymer in order to improve the etherification efficiency.

In this study, we reported on the nano-scale nickel/iron particles loaded in carboxymethyl/nanofibrillated cellulose (CMC/NFC) hydrogel for the dechlorination of o-dichlorobenzene (DCB) in aqueous solution. The biodegradable hydrogel may provide an ideal supporting material for fastening the bimetallic nano-scale particles, which was examined and characterized by TEM, SEM-EDX, FT-IR and BET. The performance of the selected bimetallic particles was evaluated by conducting the dechlorination of DCB in the solution under different reaction conditions (e.g., pH, dosage of nickel/iron nanoparticles and temperature). The results showed that about 70% of DCB could be dechlorinated at 20 °C in 8 h, which indicated that the immobilized reactive material had a high reduction activity when Ni/Fe loading dosage in the hydrogel (18 wt%) was considered. Moreover, the reduction behavior agreed to the pseudo-first order reaction, in which the dechlorination rate was irrelative to the pH aqueous solution. A kinetic model for predicting the concentration of DCB during the reduction reaction was established based on the experimental data.

Covalent organic frameworks (COFs) have attracted much attention due to their high porosity and highly ordered crystalline structure. However, the insoluble and unprocessable features of bulk COF powder limit their applications. To overcome these limitations, COF-TpPa film was prepared based on amine-group functionalized nanofibrillated cellulose (NFC) by Schiff base reaction for the first time. The obtained COF-TpPa/NFC membrane had high specific surface area (BET, 357 m2/g) and uniform pore size of 2–20 nm with the thickness of 250 nm. Via a simple post-treatment, a Pd-containing Pd@COF/NFC composite membrane, was accordingly synthesized, which showed excellent catalytic activity in catalyzing dechlorination of o-dichlorobenzene (o-DCB) with high activity (the apparent reaction rate was 0.0235 min−1).We expect that our approach will further boost research on designing and employing functional COF film for catalysis.

Image edge detection plays an important role in the process of image processing. This article classified the effect of various edge detection algorithms of digital images, mainly through the analysis of characteristics of the commonly used several kinds of classical edge detection operator in the time domain. For the actual image, the edge of the gray scale is sometimes not very clear, and the image also contains noise. A new algorithm of edge detection based on gray correlation degree and Kirsch operator is discussed in the paper. Kirsch operator is the reference sequence. Firstly, calculate the gray correlation degree of each pixel in the image and its neighbors formed eight action sequences and reference sequences, then determine the detection of edges based on gray correlation degree. The results show that this method can more accurately detect the useful information of the edge, and has a certain noise immunity. It is an effective and feasible new edge detection method.

With the rapid development of the printing industry, relying on its flexibility and advantage for short-run printing, the use of digital printing in various areas of the market becomes more widely. Digital print quality evaluation and control is particularly important. Among them, the solid density is an important indicator of print quality evaluation. Using different digital printing methods, the factors to influence the density is different. In this paper, two factors that affect xerographic toner solid density were discussed base on the principle of electrostatic imaging and toner transfer and fusing process. Experiments analyzed different transfer supply voltage conditions on CMYK four-color solid density; and the fusing temperature on CMYK four-color solid density. The results showed that: transfer supply voltage and fusing temperature are influential factors on the four-color solid density.

In this paper, a robust watermarking technique which combines features of Discrete Wavelet Transformation (DWT) and Discrete Cosine Transformation (DCT) is proposed. Firstly the original color image is converted from RGB space to Lab space. In this technique, DWT is used to decompose the luminance coefficients into various frequency and time scale. The block DCT is applied on DWT coefficients of middle frequency to provide high level of robustness. The encrypted watermark is embedded in it by comparison of the intermediate frequency coefficients. Then the color image is converted from Lab space to RGB space to get the watermarked image. Extracting the watermark does not need the original image and the original watermark, it is a blind watermarking method. Finally, the watermarked image is attacked. Peak signal-to-noise ratio (PSNR) value and the normalized correlation (NC) coefficient value are used to evaluate this technique. Simulation experiments show that the watermark is perceptually invisible, this method can achieve the highest possible robustness without losing the transparency.

In this paper, we report a synthetic method to prepare vegetable oil-based polyurethane acrylate (PUA) resin, which can be used in photo polymerization coating, ink and other fields. First, the mercaptoethanol was introduced into castor oil via thiol-ene photo-click reaction with UV irradiation, forming polyhydroxy compounds, then we added the isocyanate acrylate, which was obtained by the reaction between hydroxypropyl acrylate (HPA) and isophorone diisocyanate (IPDI), into polyhydroxy compounds, the molar ratio of HPA and IPDI is 1:1. Finally, we get the castor oil-based polyurethane acrylate. Different functional acrylate can be obtained by adjusting the hydroxyl content. Furthermore, the structure and performance of Polyurethane acrylate was confirmed by FT-IR and TG. The water absorption and adhesion of synthetic polyurethane acrylate were tested. Meanwhile, the thermal stability was studied. The results indicated that the thiol-ene addition reaction was proceeded and compared to our previous studies, the properties of cured film are greatly improved, especially the hardness and thermal stability.

Compared with the lithography and traditional technology, ink-jet printing technology has huge advantages such as reducing costs, improving production efficiency and reducing environment damage. The silver nanoparticles conductive ink used as core material in ink-jet printing technology has been greatly developed. At present, the conductive inks for printed circuit usually has high sintering temperature, low adhesion, poor mechanical properties, high cost, which limit the further industrial application. In this paper, nano silver pulp was prepared through liquid phase reduction method, and a self-made protective agent ensured that the particle size distribution of silver particles is about 5nm. The above silver pulp was dispersed in the organic resin to get conductive ink with 20% (wt%) silver content. Under 170°Csintering, the electrical conductivity of the ink layer was 1.15×104S/m.

The experiment studied effects of paper on the height and glossiness of UV ink-jet 3D printing. The results showed that there all existed penetrations between the 1st ink layer and three kinds of paper, the bigger the roughness and bulk of paper were, the larger the penetration was, and penetration between the 1st ink and paper was obviously larger than that between two ink layers. Penetration between two ink layers was stable, almost not affected by paper. The bigger the roughness and bulk of paper were, the smaller the glossiness of ink layer was. There appeared directional ink strips on ink layer on three kinds of paper, beginning from the 3rd ink layer, there also appeared ink pits on ink layer on paper whose roughness and bulk were the biggest, which showed printer precision was also an important factor for the glossiness, apart from paper. Thus, the tight and smooth paper should be selected in UV ink-jet 3D printing. Before printing, pretreatment should be done to exclude the influence of the 1st ink layer and the ink strips.

Most paper-based 3D color printers are plagued by the problem of slow printing speed, which is caused by the double-sided coloration for A4 office paper during the printing process. In order to resolve this issue, we propose a new fast and reliable coloration algorithm using geometric information in STL file, given the existing slicing methods. During the entire process, the colored surface is determined by D value that represents the positive or negative slope of layer in the 3D model after slicing. Colored inks with corresponding permeability are used to print single-sided or double-sided to accelerate the printing speed. For the given 3D models, the efficiency of the speedup is discussed and qualitatively analyzed. The results show that the proposed algorithm can increase the printing speed of paper-based 3D color printers, based on the existing materials and apparatus, at a lower cost than the common approaches.

Neugebauer printing color model can be divided into tristimulus model and spectral model in form. After color subarea, if these two models are directly applied to multicolor separation, the accuracy of color separation is far from enough. A relatively effective way is to conduct cellular division for device independent color space and achieve higher accuracy through measuring more training samples. This article aims at CMYKRGB seven color separation applications and after performing color separation for two Neugebauer models, cellular divisions with different grades would be carried out successively. The predicted color accuracy of these two models after cellular divisions will be detected using color separation printing test color targets. The impact of cellular division correction on predicted color accuracy and calculation efficiency would be analyzed based on the test results finally.

To study the structure and properties of hyperbranched polyesters as well as the modified ones. Three generations of hyperbranched polyesters named HBPE-1, HBPE-2 and HBPE-3 were synthesized by the reactions from pentaerythritol and 2,2-dihydroxy-methyl-propionic acid by single-step polycondensation. They were characterized by 1H NMR, 13C NMR and the results indicated they possessed a high degree of branching. Then homemade urethane acrylate prepolymer reacted with three generations of hydroxyl-terminated hyperbranched polyesters introducing C=C contents, the product was characterized by FT-IR, DSC, TGA techniques. The results of TGA showed well thermal stability of all the products. TGA curves of the modified HBPES showed two stages, 280-350°C means pyrolysis of main chain ester section and 400-450°C means pyrolysis of urethane acrylate section. The results of DSC indicated that glass transition temperature increased with the number of the hyperbranched polyester units’ increment. What’s more, glass transition temperature of HBPE-3 was 48.13°C. HPUA-3 was semi-crystalline material, its glass transition temperature was-12.59°C, cold crystallization temperature Tc 110.92°C, melting temperature Tm 134.74°C. Since the introduction of a large number of unsaturated units to the end, the resin can be introduced into the UV-curable systems for paints, inks, adhesives and some other fields.

A new method of reproducing oil paintings is presented in this paper. Implemented by 3D printing, this method can duplicate oil paintings with embossing effect as the same as the stereo brushstrokes in the original paintings. Firstly we use a laser scanner to detect the surface morphology and establish the 3D model of the painting. Next we analyze the UV ink thickness of the UV LED flatbed printer. After these experiments, a slicing strategy was proposed for 3D printing. Lastly, the 3D reproduction is printed by the UV LED flatbed printer.

Scan-digitizing is one of the main ways to digitize the original. Building scanner profiles are usual practice to get the consistent color. In the paper, we describe how to get the best possible ‘Raw RGB’ image from a scanner. First we measured the accuracy of those different input profiles. The profile accuracy depends on the relationship between scanner RGB and the corresponding LAB or XYZ values. Then we compared the range of those input profile tones. The ideal tone response curve can be decided by setting the scanner gamma. So a good input profile can faithfully render the dark and murky appearance of an underexposed image or the washed-out appearance of an overexposed one. In order to get a good scanner profile we proposed a method to determine a suitable tone response curve. A new algorithm was then developed according to N-component LUT-based input profile. Experiments were carried out to compare these scanner profiles. The results showed that the ICC profile generated by the new algorithm has obvious advantages in accuracy and grey predicting.

This work reports on a simple method for the determination of lysine content by an in situ sample pretreatment and headspace gas chromatographic measurement (HS-GC) technique, based on carbon dioxide (CO2) formation from the pretreatment reaction (between lysine and ninhydrin solution) in a closed vial. It was observed that complete lysine conversion to CO2 could be achieved within 60 min at 60 °C in a phosphate buffer medium (pH = 4.0), with a minimum molar ratio of ninhydrin/lysine of 16. The results showed that the method had a good precision (RSD

This study reports on a headspace-based gas chromatography (HS-GC) technique for determining the degree of substitution (DS) of cationic guar gum during the synthesis process. The method is based on the determination of 2,3-epoxypropyltrimethylammonium chloride in the process medium. After a modest pretreatment procedure, the sample was added to a headspace vial containing bicarbonate solution for measurement of evolved CO2 by HS-GC. The results showed that the method had a good precision (relative standard deviation of

An important thiol ester photosensitive monomer COMP (CO-based mercaptopropionate) was prepared via melt polycondensation method using castor oil (CO) and 3-Mercaptopropionic acid (3-MPA). Structure of the thiol-compounds was characterized by FT-IR, 1H-NMR. When the thiol compound was used as photosensitive monomer and polyurethane-acrylate prepolymer was used as main material in UV curable adhesive. The UV curable adhesive showed good curing behaviors and thermal stability with curing time 100s, T-peel strength 3.8N/25mm and shrinkage rate 8%; so the UV curable adhesive could meet the requirements for flexible packaging composite.

In the process of 3D printing, stereo image acquisition is the basis and premise of 3D modeling so that it’s important to study the acquisition methods and techniques. This paper will study the process of point cloud data acquisition of a hand model by using handheld laser scanner REVscan, and processed by the reverse engineering software Geomagic Studio. Using the object model captured, we can greatly improve the efficiency and accuracy, as well as reduce the cycle of the 3D printing. This will help achieve the transmission of 3D printing data without geographical restrictions, in which truly realize the concept "What You See Is What You Get".

This paper presents design and development of a viewing and editing tool, namely 3DPJ Editor, for Workflow visualization of 3D Print Job files. 3D Print Job (3DPJ) is an XML based format for 3D Printing job purposed to enable automation and integration of multiple vendor systems in a 3D Printing manufacture environment. The paper also shows preliminary 3DPJ format for further development of 3D Printing manufacture community with multiple vendors. The 3DPJ Format tries to separate content information and meta-data of 3D Print Jobs, in order to integrate different processes into one standard 3D Printing Workflow. The complete specification of 3DPJ should be further complex and comprehensive, and it should be gradually adopted by major 3D Printer vendors.

If the pressure sensitive adhesive is coated on the back, it can be used for bonding electronic tag, overburden, protective layer, and RFID layer. The acrylate pressure sensitive adhesives are simple and less pollution, so more and more companies pay attention on this kind of binder. Since the thickness of adhesive layer is relatively small, ink-jet printing is now widely used to easily obtain thin layer and design the pressure sensitive adhesive shape of different parts. So how to get superior performance pressure sensitive adhesive which is suitable for ink-jet printing become an urgent problem in printed electronics. The experiment was conducted through solution copolymerization of various vinyl monomers which were selected on the principle of solvent parameter prepared by free radical polymerization. The monomer, initiator mixture solution was dropped in continuous and synchronization process. By regulating the amount of initiator and polymerization temperature, we could effectively reduce the system viscosity and prepare high quality high-solids acrylate UV-curable pressure sensitive adhesives with low viscosity for ink-jet printing. The influence of initiator, solvents, transfer reagents and temperature on the structure and properties of the resin were discussed.

In this letter, a digital watermarking method which combines the singular value decomposition (SVD) and the discrete cosine transform (DCT) is presented. First of all, The Arnold scrambling and the DCT are performed on the watermark and the original image, respectively. The SVD transform is performed on the image when scrambled watermark is embedded, then the watermarked image is formed. Finally, we extract watermark from the image which is handled by halftone screens. The experimental results show that this method can achieve the highest possible robustness without losing the transparency. Also it can anti printing and scanning. All the processes do not require any additional equipment. It will bring new hope to the field of anti-counterfeiting printing with singular value decomposition is applied to the half-tone image area.

The quality of forming model was influenced by the nozzle distance, during three dimensional printing. UV inkjet printer was used to complete 3D printing; the micro quality of printings under different nozzle distances were studied, and the influences of line attributes and surface attributes in micro quality caused by different nozzle distances were analyzed and discussed, in order to get the best micro quality through the nozzle distance setting. The results showed that the nozzle distance within a certain range, the influence on line attributes is greater than the influence on surface attributes caused by nozzle distance; when the nozzle distance is between 1.5-2.5mm, the micro quality of printed image is best.

In the process of gaining digital images whether scanning or photographing, the rugged manuscript or the nonlinear characteristic of the camera lens, etc. may lead to severe geometric distortions of the captured images. Therefore, geometric rectification of the distorted images is necessary before they can be further processed. In this paper, A careful analysis was done on the cases of geometric distortion, and then an auto-correction method is deduced. In the correction process for image scanned, global thresholding was used to extract the feature region which was needed, use Sobel operator to detect edge, then use Hough transform to auto-extract the boundary. After Hough transform, some parameters associated with the control point were obtained for correcting images. Extensive experiments proved that it can recognize the outline fast and correct geometric distortions effectively. The results show that the method was applicable and had high accuracy.

With the reduction of fossil resources, renewable raw molecules have drawn a great deal of attention because of their ability to substitute for petrochemical-based materials. In this context, we synthesis a soybean oil based polyfunctional acrylate (PFA) by thiol-ene photo-click reaction and DCC catalyzed esterification in mild environment for UV-curable materials. Chemical structure was confirmed by 1H NMR and FTIR. Thermal and mechanical properties were respectively revealed by DSC, TG and TMA. All the cured films possessed excellent thermal stability and UV-curing performance, implying that they can be used for high-performance UV inks and coatings of packing industry, especially for ink-jet inks.

This work aims at presenting a new method for reproducing oil paintings via 3D printing. We used a laser scanner to detect the surface morphology of an oil painting and found it was capable to print the stereo brushstrokes through layered printing after analyzing the UV ink thickness of type UJF-3024 ink-jet printer. Base on the 3D model we established, a slicing strategy was proposed for 3D printing. An experiment was conducted to validate feasibility of the method. Ultimately, the method has proven to be comparatively effective.

With the rapid development of materials science, polymers are widely used in food packaging. Because the polymer modification process can lead to the formation of low molecular weight compounds, these substances which migrate from packaging materials to food bring many hidden dangers to food safety and threaten peoples health. In order to ensure the safety of food packaging materials, it is necessary to completely study and discuss the migration process of low molecular weight compounds, and then take effective methods to control the pollutants. The real process of polymer components in food package migration is quite complex, which is affected by many non-ideal factors. If we simply analysis the migration model, the actual results could not be got. We use migration model combining with the methods of modern analysis instruments on the basis of migration model, the model will have more practical application. The paper is based on migration theory and migration model. Under the existing experimental conditions, truly simulate the migration process of food packaging materials by using modern analytical measurement instruments and experimental simulation tools. Combine the theory and practice, analyze the migration and migration influencing factors of PS extract from qualitative and quantitative aspects. It is of great practical significance in solving the food safety problems which caused by migration from food packaging materials.

In this work we studied the migration amount of formaldehyde in products of tripolycyanamide for food packaging. In order to review the rule of products of tripolycyanamide for food packaging, with different stimulant solutions, simulated temperatures and soaking time, the migration quantities of formaldehyde in products of tripolycyanamide for food packaging into deionized water, 3% acetic acid and 15% ethanol were measured by phenylhydrazine hydrochloride spectrophotometry. The amounts of formaldehyde migrated to 3 % acetic acid was higher than those of 15 % ethanol. Espousing in higher temperature , amount of formaldehyde of the products of tripolycyanamide were migrated more. And the total migrations of formaldehyde in three exposures was beyond the EU specific migration limits for formaldehyde (15 mg/L ).With the higher temperature exposure was done , the amount of formaldehyde migration reaches maximum in lower number of repeated exposures. We also discussed the formaldehyde migration rule for different surface roughness of food packaging materials.

In this paper, polyethylene glycol thioglycolate was prepared by esterfication. Spherical silver nanoparticles were formed from silver nitrate solution by liquid chemical reduction method with hydrazine hydrate as reducant. Based on the previous two steps, the nanoAg was absorbed by the polyethylene glycol thioglycolate trough the deposition. Metal nanoparticles were absorbed by polyethylene glycol thioglycolate with M-S bond to form polymer modified nanoparticle powder. The conductive inks were prepared using modified nanoparticles, other filler and laborator self-made water-borne polyurethane resin as the bonding material. Then the ink was coated on the PET film surface to mold. Catalyst, temperature and time effected esterfication. The esterfication rate was about 55% at 110°C for 3 hours. XRD indicated that the nanoAg prepared were cubic crystals, TEM showed that the size of modified nanoAg was less than 10nm. Metal nanoparticles with M-S bond effectively reduced the surface energy and had better compatibility with organic materials. Cross-cutting tests showed that adhesion between the ink and PET films was well and the conductive inks also showed good wet resistance and thermostability.

In digital printing process, the color reproduction quality is no longer determined by printing sequence, trapping, solid density and etc., since the technique is different from traditional printing technology. In order to analyze the effects of paper on color reproduction quality in digital ink-jet printing, three kinds of commercial paper were selected and a set of experiments were carried out by using color management technique to simulate the digital proofing. The density and chromaticity of both primary color and composite color in each printed were measured. The effects of paper’s characters on shadow, mid-tone and highlight were analyzed and discussed. Finally the influence on color reproduction quality principle, including chromaticity and absorbing characteristics of paper, was revealed. The conclusion has certain significance in directive function in ink-jet printing.

Different rendering conditions (e.g., changes in lighting conditions or atmospheric conditions, changes of the imaging system) often cause significant color differences between two images. In the prepress process, the brightness and hue between two images should be adjusted to be as similar as possible. Currently, we generally use image processing software such as PhotoShop to adjust the image manually, it’s complex and time consuming. In this paper, the color correction algorithm based on histogram matching was put forward and implemented. Only one image needed to be adjusted well previously as the reference image, and the mapping relationship was established on pixels between the histogram of the source images and the reference image, then the source images would have the histograms similar to that of the reference image, so that the images would have similar color characteristic and achieve image color correction finally. The experimental result showed that the realized color correction algorithm was effective, it could not only maintain the visual effect of images, but also eliminate the color differences between the reference image and the source images.

Three thiol-compounds with different functionalities were synthesized through esterification reaction which was prepared by 1, 4-butanediol, trimethylolpropane, and pentaerythritol and 3-mercapto propionic acid respectively. Thiol-compounds and polyurethane-acrylate prepolymer were blended with addition of photo-initiator in certain proportions in order to form polyurethane curing film under UV irradiation. The structure and properties of the thiol-compounds and the polyurethane curing film were characterized by NMR, FT-IR, and TG. The results showed that the thiol-ene addition reaction between the urethane acrylates and the thiol-compounds was preceeded. With the increase of functionality of mercaptopropionic acid ester, the thermal stability improved, and the T-peel strength enhanced. When the moral ratio of urethane acrylates and trimethylolpropane-3-mercapto propionic acid ester was 1:1, the adhesive showed the best mechanical properties and thermal stability with curing time 40s, T-peel strength 88N/m and 50 % mass loss at 369°C, respectively.

Traditional maps have the characteristics of high and low terrain, using the method of contour. Although contour map can express relief form, the stereo sense is not intuitive. In this paper, according to the characteristics of UV inkjet printer, the designed test pattern was printed, ink layer thickness of different colors was measured to establish a quantitative relationship between ink thickness and ink layers. The contour map of Taiwan was chosen, in graphics processing software, to extract the contour vector image according to its elevation. According to the relationship between ink thickness and ink layers, the corresponding relation table between the actual elevation and ink layers was established. Layered corresponding table was designed, according to the contour of layered principle. The experimental result shows that the color topographic map with stereoscopic effect can be obtained, through UV ink-jet printer.

From the prospect of the printing forgery prevention technology, this paper systematically analyzed the principles of digital watermark in printing forgery prevention technology, based on this, it proposed wavelet transforming printing forgery prevention algorithm based on chaotic characteristics, in this paper, by using digital watermark image scrambling technology based on chaotic mapping to encrypt the wavelet transforming coefficient, then choose the different K value in chaotic mapping and the size of the scrambling image to combine the the cryptography technology and the wavelet transforming technology for resisting the various printing forgery attack effectively. In the end, the author made a detailed design about the wavelet transform printing forgery prevention system which based on chaotic characteristics and put it into fact by VC++, then validated the algorithm by experimental result, then compared it to the traditional watermark algorithm from the aspect of the image compression and anti attack ability to prove the stability and robustness of the algorithm this paper proposed.

In order to research the relationship between ink permeability and dot gain of different paper, four kinds of coated paper and two kinds of printing paper were chosen. Ink marks method was used to measure ink permeability of four kinds of coated paper and two kinds of common printing paper. After the ink marks were printed on each of the six kinds of paper, the length of them were measured, then the reciprocal of the ink marks length was multiplied by 1000 to obtain the value of the ink permeability. Inkjet printer was also used to print yellow GATF step-wedge simulating offset printing on the six kinds of paper, then using an optical densitometer to measure the dot gain. Conclusion shows that non-coated paper is higher in permeability than coated paper, which results in high percentage of dot gain.

Image halftoning is the core technique of digital image output, which determines the quality of the color and tonal gradation reproduction. In this paper, the existing halftoning techniques were analyzed and evaluated, such as FM halftoning and AM halftoning, etc. And a new halftoning mode, frequency conversion amplitude modulation (FCAM), was proposed. This method is still based on AM halftoning, but it uses the different screen frequency for halftoning image of the different color version, so as to avoid moiré fringes on the smaller superposition angle. The use of new halftoning model can achieve halftoning image output which is more than 4 colors (such as 6 colors or 7 colors) without visual moirè pattern when overprinting. By the new technique, high-fidelity printing is achieved, and the color gamut of the output image is expanded, and we can get more vivid realistic effect of image transmission. We tested color gamut expansion of 6 colors and 7 colors high-fidelity printing, and obtained the expected conclusion by quantitative analysis.

We proposed overall design of the visualization browsing map data in network environment in this paper. And we developed map data flow according to the data structure and attributes of map data base. We programmed one map display control, MapCtrl.ocx, with GUI in the specific implementation. It could browse the map by utilizing map data base and self-designed map symbol base. Furthermore, we detailed the specific process of programming the control and the related techniques, such as component technique, data exchange technique and display technique. We developed a prototype of map data visualization browsing system based on ActiveX in network environment, which could achieve several functions such as browsing vector graphics of map data on internet, operation and simple query and analysis.

With the development of printing industry, more and more waste ink appears. Currently, most wastes were dealt with by incineration or landfill, which brought great pollutions to the environment. Based upon co-boiling distillation, grinding, and toning, a method can convert waste ink into black for reuse, which reduces environmental pollutions from wastes.

A series of low viscosity and solvent free polyurethane (PUR) adhesives were synthesised from polyester [poly-1, 4-butylene adipate glycol (PBA)], castor oil (CO), diethylene glycol (DEG) and isophorone diisocyanate. In this study, the molecular structure was characterised by attenuated total reflection Fourier transform infrared spectrometer, and the thermostability was analysed by thermogravimetric analyser. The influences of different ratios of polyols on viscosity, water resistance as well as adhesion intensity, curing time and hardness of PUR elastomer were investigated. The experimental results showed that with the increase in DEG, the PUR had higher bond strength, better water resistance and harder film hardness. It was also found that CO could improve the water resistance and reduce the curing time of the prepolymer. The best CO/PBA/DEG mole ratio was 0·5∶0·15∶0·35.

It briefly analyzed the disadvantages of ICC (International Color Consortium) color management technology and color management technology based on iCAM (image Color Appearance Model), and then it put forward the thought of multi-spectral color management technology. It specifically designed the basic framework of the multispectral color management, focused on the basic composition and working principle of spectral color management model. Besides it analyzed the composition and basic principle of spectral color gamut mapping framework. Lastly it pointed out the research direction of multispectral color management.

In this paper, a kind of water-soluble acrylic emulsion with methyl methacrylate (MMA) and butyl acrylate (BA) as hard and soft monomer respectively, acrylic acid (AA) and hydroxypropyl methacrylate as functional monomers, ammonium persulfate (APS) and ammonia as initiator and neutralizer respectively, was prepared by emulsion polymerization. The resulting emulsion possesses high solid content, low viscosity, high stability and film-forming properties, indicating that it would be applicable to water-based ink. The effect of the ratio of MMA to BA on the film-forming properties of resin and the influence of AA and HPA on the water-soluble property and viscosity of resin were investigated, and the relationship of reaction temperature and the emulsion stability was also studied. This paper can provides a certain reference to synthesis of acrylic resin and application of acrylic resin to the water-based ink.

The first component of the Polyurethane adhesive was prepared with polyester polyol, polyether polyol ,castor oil and isophorone diisocyanate. And this component was mixed with the castor oil and its modified production to prepare a two-component solvent-free aliphatic polyurethane laminating adhesive. In this study, the influences of the copolymerization ratio of polyester/ether on viscosity, heat resistance, adhesion strength and boiling resistance were studied, as well as influences of castor oil and its modified production on curing speed and adhesion strength. The results showed that when proportion of polyether diol was 25% and castor oil was 50% of the total hydroxyl content of first component, the PU adhesive with lower viscosity, better reactivity and enhanced boiling resistance would be achieved. And with an appropriate amount of derivatives castor oil in second component, the curing speed and adhesion strength of the PU adhesive were significantly improved.

Sterile anti-shedding UV ink used on PE bottle cap was developed. The ink can be soaked in peracetic Acid solution with the concentration at 1800ppm for four hours’ sterilization under the constant temperature 90 °C, and there was no deinking phenomenon. The ink was prepared by mixed experimental method. The influence of prepolymer, monomer and photoinitiator on the UV ink properties such as curing speed, adhesion and solvent resistance were discussed. The optimum formulation of this sterile ink was as follow: PEA is 22.5%, PUA is 22.5%, TMPTA is 13.5%, DPGDA is 13.5%, 907 is 3%, ITX is 3%, carbon soot is 18%, defoamer is 4%. Under this condition, the properties of UV curing ink were as follow: curing time 10s, adhesion level 3 and good solvent resistance. The ink was an environmental ink used on plastic bottle cap.

The properties of iCAM appearance model including the viewing conditions calculation, chroma adaptation transformation, IPT properties computation and perception correlation calculation was studied according to the researches studied in the paper. iCAM color appearance model was proposed as the PCS in this paper and the effects on printing image reproduction and evaluation were studied. The conclusions showed that setting iCAM as the PCS had an important role in improving color conversion accuracy and the high fidelity reproduction quality of printing image.

As one of the intelligent materials, Magnetorheological Fluid is dispersions composed of soft magnetic particles, carrier liquid and additives. The apparent yield strength of Magnetorheological Fluid can be changed significantly within milliseconds by the application of an external magnetic field. As the key elements of the three-dimensional imaging, the three-dimensional grating is a special material composed of cylindrical lens. Because water-based magnetorheological fluid has a unique magnetorheological effect, good rheological properties and environment-friendly performance, it is applied to the production of three-dimensional printing grating, through the change of the magnetorheological fluid to control the exact distribution of the soft magnetic particles, so as to achieve the desired accuracy, light transmittance and stability of printing raster, and finally present a ideal three-dimensional effect after laminating the grating and three-dimensional images.

Line quality micro-measurement is of important content of objective measurement, contributing to reproduction quality assessment of digital printed character and line metrics. Transforming physical presswork to digital image is not only the first but also a key procedure in micro quality measurement. In this study, effect of input resolution was verified in order to determine the precision requirement in micro quality survey. A series of experiments were carried out to measure same inkjet samples, which were scanned with a normal flatbed in three resolution sets. The effect on assessment accuracy of resolution condition was analyzed by pair-wise comparison method. Results show that normal flatbed is precise enough for micro line quality measurement. But 600DPI identified in ISO13660 standard is too low to serve in this survey. 1200DPI can work well enough and extra-high resolution version will not respond to improve the measurement precision obviously in inkjet line attribute evaluation.

The impact of coated paper printability for image quality on the high-fidelity digital printing was studied in this paper. Compared with the traditional printing technology, high-fidelity digital printing technology is more likely to expand the color gamut, maintain the original tone linear and produce vivid image. The performance of coated paper to a large extent determines the image quality. In order to get high-quality printed matters, the mechanism of the coated paper printability influencing on the performance on high-fidelity digital printing is need to be researched in-depth. The printability of coated paper was studied from several aspects in this paper, including the structural properties, roughness, optical properties, absorption etc, the relationships between these properties and printing color, dot reproduction performance were also studied. Based on the previous theoretical and practical studies, the printability evaluation system of coated paper on high-fidelity digital printing was established initially. On digital printing, accurate color management technology also affects the printing quality as the performance of coated paper, so the advanced color management technology was also used in the current study. The results showed that the pore structure and the absorbent of coated paper were the most important factors for affecting the printing quality, and the roughness and optical properties of coated paper also had a certain impact.