Blending impact of hardwood pulps with softwood pulp on tissue paper properties

The influences of endo-cellulase pretreatment of bleached softwood pulp before refining was investigated in this paper. Refining energy consumption, paper properties, wetting properties, electric charge and aggregation structure of fiber were investigated. The results showed that pretreated with endo-cellulase at the dosage of 0.4ECG/g before refining could increase the refining degree by 53.09%, and it would reduce refining energy consumption significantly. At this dosage, the tensile index of the paper sheet increased while the tear index of paper sheet decreased slightly. Additionally, enzymatic pretreatment could raise fiber surface wettability, lower the absolute value of Zeta potential and decrease the crystallinity of fiber, which was help to improve refining performance.

Download Full-text

Cellulose fiber enzymatic modification to improve the softness, strength, and absorption properties of tissue papers

BioResources ◽

10.15376/biores.16.1.846-861 ◽

2020 ◽

Vol 16 (1) ◽

pp. 846-861

Author(s):

Flávia P. Morais ◽

Ana M. M. S. Carta ◽

Maria E. Amaral ◽

Joana M. R. Curto

Keyword(s):

Fiber Type ◽

Capillary Rise ◽

Reaction Times ◽

Cellulose Fiber ◽

Strength Properties ◽

Enzymatic Modification ◽

Absorption Properties ◽

Paper Properties ◽

Tissue Properties ◽

Tissue Paper

Effects of enzymatic modification were evaluated in bleached Eucalyptus kraft and sulfite cellulosic pulps, separately, to improve key tissue paper properties and design new Eucalyptus fiber applications. Different cellulase dosages (0.01 mg and 0.1 mg of enzyme/g of pulp) and reaction times (30 min and 60 min) were used to modify the fibers and replace the traditional mechanical based refining or beating process. The results showed that for enzymatic modified kraft and sulfite pulps, the softness properties were improved by 1 and 2 units, respectively, for each unit of decreased strength properties. To achieve a balance between the tissue properties, the different fiber pulp furnishes that contained 80% of the enzymatically treated kraft pulp and 20% of the sulfite pulp with and without enzymatic treatment, were studied. Overall, the structures made with these mixtures presented softness properties in the commercial range (57.8 to 74.4), improved absorption properties (107 mm to 120 mm of capillary rise), and good strength properties (13.0 to 17.7 N.m/g). This study was conducted in order to adjust the fiber furnishes according to industrial tissue standards, using one Eucalyptus fiber type providing strength and another providing softness.

Download Full-text

Computational Simulation Tools to Support the Tissue Paper Furnish Management: Case Studies for the Optimization of Micro/Nano Cellulose Fibers and Polymer-Based Additives

Polymers ◽

10.3390/polym13223982 ◽

2021 ◽

Vol 13 (22) ◽

pp. 3982

Author(s):

Flávia P. Morais ◽

Ana M. M. S. Carta ◽

Maria E. Amaral ◽

Joana M. R. Curto

Keyword(s):

Case Studies ◽

Raw Materials ◽

Computational Simulation ◽

Cellulose Fibers ◽

Paper Properties ◽

Fiber Modification ◽

Simulation Tools ◽

Tissue Paper ◽

Nano Cellulose ◽

End Use

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.

Download Full-text

EFFECT OF CHITOSAN ADDITION DURING PAPER-MAKING ON AGEING STABILITY OF DOCUMENT PAPER

Cellulose Chemistry and Technology ◽

10.35812/cellulosechemtechnol.2021.55.93 ◽

2021 ◽

Vol 55 (9-10) ◽

pp. 1083-1094

Author(s):

DIMITRINA TODOROVA ◽

◽

VESKA LASHEVA ◽

Keyword(s):

Chitosan Solution ◽

Thermal Ageing ◽

Paper Strength ◽

Aluminium Sulphate ◽

Paper Properties ◽

Hygroscopic Properties ◽

Complex Evaluation ◽

Softwood Pulp ◽

Negative Effect ◽

Hardwood Pulp

The aim of the present work has been to study the influence of chitosan addition into the composition of paper intended for documents on its ageing stability, with a view of enhancing the resistance of paper strength and optical properties over time. The chitosan solution was added during the formation of the paper sheets in various amounts: 0.2%, 1% and 2% o.d.f. Paper samples of different fibrous compositions were prepared from bleached sulphate softwood pulp (BSWP) and bleached sulphate hardwood pulp (BHWP) in the following ratios: 50% BSWP:50% BHWP, 80% BSWP:20% BHWP, 100% BSWP and 100% BHWP. Then, paper samples were subjected to accelerated thermal ageing for 24 hours at 105 °C. It was found that the use of chitosan as additive in the composition of bleached cellulose paper samples led to improved strength and hygroscopic properties. The study showed that chitosan could be used in the production of kraft document papers comprising aluminium sulphate, as the presence of aluminium sulphate had no negative effect on the action of the biopolymer. Regarding the complex evaluation of the properties of the obtained papers, it could be summarized that, for the studied fibrous compositions, the optimum amount of the additive was 1% chitosan for a fibrous composition of 50% bleached softwood pulp and 50% bleached hardwood cellulose. Therefore, preparing document paper with the addition of chitosan is a convenient procedure to enhance a number of paper properties, even after the ageing process.

Download Full-text

Study on the Degradable Mulch Sheet Papermaking Technique

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.430-432.1236 ◽

2012 ◽

Vol 430-432 ◽

pp. 1236-1240 ◽

Cited By ~ 1

Author(s):

Yu Jie Gao ◽

Hong Juan Liu ◽

Min Li

Keyword(s):

Current Paper ◽

Paper Properties ◽

Base Paper ◽

Softwood Pulp

The current paper studies the technology used in making mulch sheet out of softwood pulp. The best technology for mulch sheet manufacturing is determined by studying the effect of the beating degree, quantitation of the base paper, dosage, and usage of the Polyamide epichlorohydrin condition for the base paper properties. The transparency is found to be very good after the base paper is steeped in a self-made transparent agent. Degradability experiments conducted on soil suggest that the mulch sheet is completely degradable.

Download Full-text