scholarly journals Um estudo sobre a utilização de sete papéis distintos no "facing" de pintura a óleo sobre tela

2021 ◽  
Vol 20 ◽  
pp. 146-161
Author(s):  
Patrícia Sofia Fernandes Varela ◽  
Matteo Rossi Doria ◽  
Ana Bailão
Keyword(s):  
Wet Strength

Será que o papel japonês é o material mais adequado para o facing de pintura sobre tela? Seria benéfica a utilização de papéis específicos adequados a cada caso? Este estudo procurou dar resposta a estas questões e dar a conhecer, dos papéis testados, qual o mais adequado ao facing em pintura a óleo sobre tela. Para o efeito, foram executadas maquetes, de três cores diferentes. Em cada cor foram realizadas duas texturas, uma lisa e outra empastada. Foram também definidas, em cada cor e textura, três áreas: duas para aplicação de dois vernizes distintos e outra para permanecer sem verniz. As maquetes foram realizadas para que se obtivessem todas as combinações dos materiais anteriormente descritos e cada papel foi testado em cada uma destas combinações.Realizados os ensaios e analisados os resultados, concluiu-se que, dos materiais testados, o papel japonês nem sempre foi o mais eficaz, tendo sido superado pelo Wet-strength Tissue, um papel celulósico, por demonstrar facilidade de aplicação, pela resistência do papel e pela perda de fibras.

Regulatory and sustainability initiatives lead to improved polyaminopolyamide epichlorohydrin (PAE) wet-strength resins and paper products

TAPPI Journal ◽  
2018 ◽  
Vol 17 (09) ◽  
pp. 519-532 ◽  
Author(s):  
Mark Crisp ◽  
Richard Riehle
Keyword(s):  
Health And Safety ◽  
Cost Effective ◽  
Worker Safety ◽  
Regulatory Requirements ◽  
Wet Strength ◽  
The Past ◽  
Consumer Safety ◽  
Federal Institute ◽  
Sustainability Initiatives ◽  
The Impact

Polyaminopolyamide-epichlorohydrin (PAE) resins are the predominant commercial products used to manufacture wet-strengthened paper products for grades requiring wet-strength permanence. Since their development in the late 1950s, the first generation (G1) resins have proven to be one of the most cost-effective technologies available to provide wet strength to paper. Throughout the past three decades, regulatory directives and sustainability initiatives from various organizations have driven the development of cleaner and safer PAE resins and paper products. Early efforts in this area focused on improving worker safety and reducing the impact of PAE resins on the environment. These efforts led to the development of resins containing significantly reduced levels of 1,3-dichloro-2-propanol (1,3-DCP) and 3-monochloropropane-1,2-diol (3-MCPD), potentially carcinogenic byproducts formed during the manufacturing process of PAE resins. As the levels of these byproducts decreased, the environmental, health, and safety (EH&S) profile of PAE resins and paper products improved. Recent initiatives from major retailers are focusing on product ingredient transparency and quality, thus encouraging the development of safer product formulations while maintaining performance. PAE resin research over the past 20 years has been directed toward regulatory requirements to improve consumer safety and minimize exposure to potentially carcinogenic materials found in various paper products. One of the best known regulatory requirements is the recommendations of the German Federal Institute for Risk Assessment (BfR), which defines the levels of 1,3-DCP and 3-MCPD that can be extracted by water from various food contact grades of paper. These criteria led to the development of third generation (G3) products that contain very low levels of 1,3-DCP (typically <10 parts per million in the as-received/delivered resin). This paper outlines the PAE resin chemical contributors to adsorbable organic halogens and 3-MCPD in paper and provides recommendations for the use of each PAE resin product generation (G1, G1.5, G2, G2.5, and G3).

Mineral/microfibrillated cellulose composite materials: High performance products, applications, and product forms

TAPPI Journal ◽  
2018 ◽  
Vol 17 (09) ◽  
pp. 507-515 ◽  
Author(s):  
David Skuse ◽  
Mark Windebank ◽  
Tafadzwa Motsi ◽  
Guillaume Tellier
Keyword(s):  
Composite Materials ◽  
High Performance ◽  
Aqueous Suspension ◽  
Production Capacity ◽  
Cost Savings ◽  
Cost Effective ◽  
New Materials ◽  
Wet Strength ◽  
Product Forms ◽  
Cellulose Composite

When pulp and minerals are co-processed in aqueous suspension, the mineral acts as a grinding aid, facilitating the cost-effective production of fibrils. Furthermore, this processing allows the utilization of robust industrial milling equipment. There are 40000 dry metric tons of mineral/microfbrillated (MFC) cellulose composite production capacity in operation across three continents. These mineral/MFC products have been cleared by the FDA for use as a dry and wet strength agent in coated and uncoated food contact paper and paperboard applications. We have previously reported that use of these mineral/MFC composite materials in fiber-based applications allows generally improved wet and dry mechanical properties with concomitant opportunities for cost savings, property improvements, or grade developments and that the materials can be prepared using a range of fibers and minerals. Here, we: (1) report the development of new products that offer improved performance, (2) compare the performance of these new materials with that of a range of other nanocellulosic material types, (3) illustrate the performance of these new materials in reinforcement (paper and board) and viscosification applications, and (4) discuss product form requirements for different applications.

scholarly journals Development and performance study of a natural silk fiber facial mask paper

2020 ◽  
Vol 15 ◽  
pp. 155892502097575
Author(s):  
Huiling Wang ◽  
Bin Zhou
Keyword(s):  
Silk Fiber ◽  
Entrainment Rate ◽  
Performance Study ◽  
Wet Strength ◽  
Facial Mask ◽  
Antibacterial Performance ◽  
Lower Elongation ◽  
The Common ◽  
And Performance ◽  
Acid Structure

Facial masks are beauty products which composed of a facial mask paper and beauty solution. Silk contains the amino acid structure closest to the human skin, and has the skin-friendly, cosmetic and antibacterial functions, but the common method for making nonwoven facial mask paper is not suitable for silk. In this paper, the silkworm’s spinning path is intervened manually to obtain a smart silk facial mask paper (SMC) of controllable thickness, so that the sericin on the silk fiber is well preserved. In the experiment where the SMC is compared with the nonwoven 384-cuprammonium rayon facial mask paper (CRMC) which is the most widely used in the market, it is found that the ways of forming the two facial mask paper are completely different, and therefore the morphologies under SEM are obviously different. The thickness of the SMC is 0.183 mm and the areal weight of it is 38.0 g/m2. It is very close to the CRMC (0.187 mm, 38.4 g/m2). The porosity of the SMC is 84.0%, which is slightly lower than that of the CRMC (86.3%), but its pores are well distributed. Compared with the CRMC, the smart SMC has higher dry and wet strength, lower elongation, slightly lower air permeability and liquid entrainment rate, and better antibacterial performance.

Enabled Cellulose Nanopaper with Outstanding Water Stability and Wet Strength via Activated Residual Lignin as a Reinforcement

2021 ◽  
Author(s):  
jinlong wang ◽  
Wei Chen ◽  
Tengteng Dong ◽  
Haiqi Wang ◽  
Shurun Si ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Plant Cell ◽  
Cell Walls ◽  
Water Stability ◽  
Plant Cell Walls ◽  
Residual Lignin ◽  
Wet Strength ◽  
Cellulose Nanopaper

Due to water-sensitive hydrogen bonding, uncontrolled deformation and mechanical decay of cellulose nanopaper (CNP) caused by water remain challenging. Inspired by plant cell walls and bonding strengthening, a strategy is...

Effect of Surface Grafting-Modified on Structure and Property of Cellulose Fibers

2012 ◽  
Vol 627 ◽  
pp. 43-48
Author(s):  
Shu Hua Wang ◽  
Jin Ming Dai ◽  
Hu Sheng Jia ◽  
Bing She Xu
Keyword(s):  
Cellulose Fibers ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Wet Strength ◽  
Structure And Property ◽  
Chemically Modified ◽  
Crosslinking Process ◽  
Acrylamide Polymerization ◽  
Modified Cellulose ◽  
Effect Of Surface

Cellulose fibers were chemically modified on surface by acrylamide polymerization and glutaraldehyde crosslinking. The chemical and morphological structures of modified cellulose fibers were investigated with X-ray diffraction, FTIR spectra, and scanning electron microscopy (SEM). The crystalline conformations of the cellulose fibers were slightly changed in polymerization and crosslinking process. The wet strength of modified cellulose fibers was improved. Appreciable difference between the surfaces of native and modified cellulose fibers was observed from SEM images.

Improving wet strength of soy protein films using oxidized sucrose

2014 ◽  
Vol 132 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Linyun Liu ◽  
Zhize Chen ◽  
Bijia Wang ◽  
Yiqi Yang
Keyword(s):  
Soy Protein ◽  
Protein Films ◽  
Wet Strength

Water and humidity-induced shape memory cellulose nanopaper with quick response, excellent wet strength and folding resistance

2020 ◽  
Vol 392 ◽  
pp. 123673 ◽  
Author(s):  
Meiyan Wu ◽  
Prakit Sukyai ◽  
Dong Lv ◽  
Fang Zhang ◽  
Peidong Wang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Quick Response ◽  
Wet Strength ◽  
Cellulose Nanopaper

scholarly journals Fractional pulping of packaging board in high consistency drum pulping

TAPPI Journal ◽  
2017 ◽  
Vol 16 (02) ◽  
pp. 89-95
Author(s):  
HEIKKI UPOLA ◽  
ARI AMMALA ◽  
MIRJA ILLIKAINEN
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Fiber Length ◽  
Short Fiber ◽  
Strength Properties ◽  
Ash Content ◽  
Packaging Materials ◽  
Wet Strength ◽  
Fiber Fractions ◽  
High Consistency

A wide variety of packaging materials with different wetting rates and wet strength properties are used in old corrugated container (OCC) processing. The disintegration rates of the different grades also vary and enable the use of the fractional pulping concept where easily disintegrated material is removed at the early stages. In the present study, fractional drum pulping was studied by pulping (Pilot drum pulping) and fractionating (Tampella oscillating screen) a mixture of strong-grade kraftliner and weak-grade fluting at high consistency to determine if energy consumption could be reduced. The results showed that a 25% energy saving could be realized through fractional pulping and an even higher potential might be possible if pulping conditions are optimized. Average fiber length, fines content, and ash content in the separated fractions were analyzed. The separated short fiber fractions and long fiber fractions could be individually processed, thus decreasing the volumes in the unit processes on the OCC line.

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