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In the papermaking process, it can be difficult to maintain specified mechanical-strength levels while minimizing fiber costs and meeting specified targets. If significantly increased, bonding could be achieved without as much refining of the fibers, just adding a biopolymer, then it might be possible to achieve important paper-property targets at lower basis weights. The incorporation of a biopolymer in the papermaking process changes positively the relations between important pulp properties, rendering its application differentiated and advantageous, as these gains will be immediately passed on to the paper obtained. Thus, this study aims to evaluate the development potential of the physical-mechanical properties of Sack Kraft paper through the application of biopolymers in two types of cellulose pulp from Pinus spp. (UKP - Unbleached Kraft Pulp and DKP - Delignified Kraft Pulp), allowing for a possible basis-weight reduction in these papers. Two different biopolymers were developed according to the specific type of cellulose pulp and production process conditions of the present study, B1 and B2. The applications and analyses contemplated two scenarios: 1) cellulose pulp without refining, with 120 minutes of retention time for both pulps; and 2) industrially-refined cellulose pulp, with 23 minutes and 20 minutes retention time for UKP and DKP, respectively. For scenario 1, the cellulose pulp was refined in laboratory after application of the biopolymers, considering the following refining degrees: initial, 15, 20 and 30°SR. For both scenarios, laboratory handsheets were formed to carry out physical and mechanical tests in order to assess properties of the pulp itself, which were: tensile strength, stretch, TEA (Tensile Energy Absorption), tearing resistance and burst strength. Overall, the industrially -refined cellulose pulp with subsequent application of Biopolymer B2 showed the best performance for both types of cellulose pulp, with a substantial increase in tensile index (9% - 16.5%), stretch (9% - 16%), TEA (21% - 30%) and burst index (13% - 14%) for UKP and DKP cellulose pulp, respectively. The results show that applying the biopolymer after refining allows for the gains obtained in cellulose pulp to be passed on to the end product, resulting in expressive gains in Sack Kraft paper quality and production. [ABSTRACT FROM AUTHOR]

The article informs about the ongoing modernization efforts at the BO Paper's Arapoti-PR plant, which aims to expand its production capacity and enhance flexibility. Topic includes investments in the plant's infrastructure and workforce training. The Arapoti unit specializes in graphic papers, fibers, and specialties and plays a significant role in the social and economic development of the region, providing both direct and indirect employment opportunities.

The article focuses on the role of the forest-based industry in the circular economy, with the Industrial Research and Development Manager of Klabin discussing the contribution of the sector to solutions aligned with the bioeconomy and circular economy and how ABTCP provides technical support to companies in Brazil. It further discusses the pulp and paper sector's performance in the circular economy and its contribution to the development of bioeconomy.

Multiple coatings are often employed to give a smooth, highly opaque and even surface on coated board which is suitable for high-quality printing. The first coating applied generally contains coarser pigments which give high bulk and good coverage of the fibres. The topcoat is often designed to have finer pigments in order to obtain the required gloss, optical properties and end functionality (laser marking and printing). As well as the impact of the pigment choice in the formulation, the coating application method and the rate that it dries also have a significant influence on the resulting topography and pore structure. The binders, thickeners and additives in the coating formulation will control the rate of water loss during the coating process and this determines the runnability of the coating layer on the board machine as well as its final structure. This publication is the first in a series of 3 which explore factors that impact the structure of the precoat and its subsequent influence on the topcoat. In this work, the same basepaper, pigment and latex binder systems are used throughout and the variables studied are the speed of the coating drying, the weight % solids of the coating colour applied to the base and finally the impact of adding thickener to the precoat. Mercury porosimetry and stain length tests were used to probe the bulk and surface porosity of the layers respectively and in each case the impact on the porosity of the precoat alone and the final top coated board were assessed. A comparison of the bulk porosity of coatings applied onto porous basepaper and onto non-porous plastic was also made to determine the impact of dewatering on the dried layer structure. SIMS sectioning and labelling of the precoat and topcoat with markers also allowed assessment of movement of water and starch within the coated board. The work has proven that the pore structure of the precoat is very dependent on the substrate to which it is applied (porous or non-porous), the % solids content and the amount of thickener added as well as the speed of drying. These differences then follow through in influencing the structure of the final topcoat. The work will help provide levers for paper and board producers to be able to optimise their whole coating formulation. [ABSTRACT FROM AUTHOR]

The article offers information on the pulp & paper industry of Brazil focusing on the planted trees sector's performance in the first quarter of 2017. Topics discussed include the increase in the pulp production and exports, the production paper and its exports, and the revenue and places to which the products were exported including China. Also presented are several charts and graphs showing production.