Wyniki wyszukiwania - BazTech

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Selected aspects of production and characterization of layered biopolymer composite bonded with a cellulose-based binder

Dasiewicz Julia, Kowaluk Grzegorz

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2022

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No. 119

24--34

EN

Selected aspects of production and characterization of layered biopolymer composite bonded with a cellulose-based binder. This project aimed to study the possibility of using regenerated cellulose for gluing a layered composite. In the scope of research have been produced different variants of layered composite differ in wood species and pressing time. The produced composite has been characterized according to selected mechanical and physical properties. The prepared samples have been referred to as those bonded with industrial MUF resin. Obtained results proved that regenerated cellulose can be used as a bonding agent. Furthermore, the tests confirmed an improvement in mechanical and physical properties after the bonding of the regenerated cellulose.

PL

Wybrane aspekty wytwarzania i charakterystyka warstwowego kompozytu biopolimerowego wiązanego spoiwem na bazie celulozy. Celem badań było określenie możliwości wykorzystania regenerowanej celulozy do klejenia kompozytu warstwowego. W ramach badań wykonano różne warianty kompozytu warstwowego różniące się gatunkiem drewna i czasem prasowania. Wytworzony kompozyt scharakteryzowano zgodnie z wybranymi właściwościami mechanicznymi i fizycznymi. Uzyskane wyniki dowiodły, że regenerowana celuloza może być stosowana jako spoiwo. Ponadto badania potwierdziły poprawę właściwości mechanicznych i fizycznych po użyciu regenerowanej celulozy w kompozytach warstwowych.

2

Particleboards with partially liquefied bark of different particle sizes

Jiang Wen, Adamopoulos Stergios, Petrič Marko, Šernek Milan, Medved Sergej

Drewno : prace naukowe, doniesienia, komunikaty

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2021

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vol. 64, nr 207

43--57

EN

This paper presents a novel method of partially liquefying bark sawmilling waste for use in making particleboards. Maritime pine (Pinus pinaster Ait.) bark of different particle sizes (fine, medium, coarse, and mixed) was partially liquefied in the presence of ethylene glycol as a solvent and sulphuric acid as a catalyst at 180°C for 30 minutes. Single-layer particleboards were prepared by mixing partially liquefied bark (PLB) and wood chips at a ratio of 0.25 with no adhesives (group A) and at ratios of 0.25 or 0.1 with melamine-urea-formaldehyde (MUF) adhesives for additional bonding (groups B and C respectively). Mechanical and physical properties of the particleboards were tested according to European standards. The results showed that the boards in group A had lower densities, inferior mechanical properties and higher moisture content than those in groups B and C. Bark particle size had a significant effect on the mechanical properties of particleboards within each group. Additional MUF bonding and avoidance of coarse bark particles had a positive effect on mechanical properties. The thickness swelling (TS) and water absorption (WA) values of MUF-bonded boards were lower than those of boards without MUF, and greater addition of PLB produced particleboards with better water resistance. Bark particle size was not as critical for TS and WA as for mechanical properties. The overall results suggested using a bark particle size of < 2 mm for further studies.

3

Research on the effect of MUF resins as an agent for fire protection of plywood veneers in the form of a thermosetting adhesive film

Jóźwiak M., Fojutowski A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2018

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No. 104

22--30

EN

Research on the effect of MUF resins as an agent for fire protection of plywood veneers in the form of a thermosetting adhesive film is presented. The external protection with thermosetting films made of non-waste MUF resins only slightly reduce the value of the combustion index. The protection of plywood in the form of film coatings of hardened MUF resin on the surface are not sufficiently fire protection of the plywood. The combustion index is in the range from 2.46 to 3.22. The methods has a very positive effect on the reduction of the flammability index of plywood.