Effect of sodium ascorbate on weathering performance of NaOH pulping and paper

• Autorzy: Gencer A. , Onat S. M. , Can A. , Ozgul U. , Sivrikaya H. , Yurdakurban F.

Identyfikatory

DOI

10.12841/wood.1644-3985.171.11

• Języki publikacji: EN

Abstrakty

EN

This study aimed to decelerate the weathering of paper from light by utilizing the antioxidant property of sodium ascorbate (SA), which is an ascorbic acid salt. Three different sessions of cooking were carried out by adding 2.5%, 5.0% and 7.5% of SA in proportion to the weight of a completely dried chip in addition to 24% NaOH in order to identify the influence of SA on cooking. It was observed that the pulp yield decreased when SA was added to the cooking. For that reason, it was decided to add SA into the control pulps instead of adding the digester. The same amount of SA was added to the control. The SA-added pulps were held in the agitator initially first for 2 hours and then 12 hours before making paper. So as to determine the influence of the treatment on the process. The paper was treated for 72, 144 and 256 hours and values of ΔL, Δa, Δb and ΔE were identified in order to determine the period of the SA’s efficacy against weathering. The total discoloration in all the samples of paper, displayed an increase with an extension of the time period. The lowest discoloration after a 256-hour time period was seen in the sample group where 7.5% of SA was added and soaked in the water. The final results indicated that the most appropriate concentration was 5% and that pulp suspension must be retained for 12 hours to improve mechanical properties.

Słowa kluczowe

EN

paper; pulp; UV; accelerated weathering

• Wydawca: Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
• Czasopismo: Drewno : prace naukowe, doniesienia, komunikaty
• Rocznik: 2016
• Tom: vol. 59, nr 198
• Strony: 49--60
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Gencer A.

• Bartin University, Faculty of Forest, Bartin,Turkey

autor

Onat S. M.

• Bartin University, Faculty of Forest, Bartin,Turkey

autor

Can A.

• Bartin University, Faculty of Forest, Bartin,Turkey

autor

Ozgul U.

• Bartin University, Faculty of Forest, Bartin,Turkey

autor

Sivrikaya H.

• Bartin University, Faculty of Forest, Bartin,Turkey

autor

Yurdakurban F.

• Bartin University, Faculty of Forest, Bartin,Turkey

Bibliografia

• Baar J., Ondroušková J., Rademacher P. [2015]: Change of wood moisture content during artifical ligth irradiation and its influence on colour measurement. Drvna Industrija 66 (3): 189-193
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• Chang H.T., Yeh T.F., Chang S.T. [2002]: Comparisons of chemical characteristic variations for photodegraded softwood and hardwood with/without polyurethane clear coatings. Polymer Degradation and Stability 77, 1: 129-135
• Hammatt N., Grant N.J. [1998]: Shoot regeneration from leaves of Prunus serotina Ehrh. (black cherry) and P. avium L. (wild cherry). Plant Cell Reports 17, 6-7: 526-530
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• Princi E., Vicini S., Marsano E., Trefiletti V. [2008]: Influence of the artificial weathering on thermal stability of paper-based materials.Thermochimica Acta 468 (1): 27-34
• Schmidt J.A., Rye C.S., Gurnagul N. [1995]: Lignin inhibits autoxidative degradation of cellulose. Polymer degradation and stability 49, 2: 291-297
• Sivrikaya H., Ekinci E., Can A., Tasdelen M., Gokmen K. [2015]: Effect of heat treatment on the weathering and hardness properties of some wood species. 11th Meeting of the Northern European Network for Wood Science and Engineering (WSE). September 14--15, Poznan, Poland: 83-91
• Vanska E., Luukka M., Solala I. Vuorinen T. [2014]: Effect of water vapor in air on thermal degradation of paper at high temperature. Polymer Degradation and Stability 99: 283-289
• Zou X., Uesaka T., Gurnagul N. [1996]: Prediction of paper permanence by accelerated aging II. Comparison of the prediction width natural aging result. Cellulose 3: 269-279
• Yu H., Yu W., Yang L., Fang C., Xu M. [2015]: Surface discoloration analysis and lignin degradation fragments identification of UV-irradiated moso bamboo (Phyllostachys pubescens Mazel). Bioresources 10 (1): 1617-1626
• List of standards
• ASTM G154:1998 Accelerated weathering simulates damaging effects of long term outdoor exposure of materials and coatings
• ISO 2813:1994 Paints and varnishes- Determination of specular gloss of non-metallic paint films at 20 degrees, 60 degrees and 85 degrees
• ISO 7724-2:1984 Paints and varnishes-Colorimetry- Part 2: Color measurement, ISO Standart
• TAPPI T275 sp-02:2002 Screening of pulp (Somerville-type equipment)
• TAPPI T519 om-02:2002 Diffuse Opacity of Paper (d/0 paper backing)
• TAPPI T525 om-02:2002 Diffuse Brightness of Pulp (d/0)
• TAPPI T494 om-01:2001 Tensile Properties of Paper and Paperboard
• TAPPI 403 om-02:2002 Bursting strength of paper