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Titolo:
Element behavior in the mat pressing process and properties of the boards
Autore:
Nishimura, T; Yanagida, M; Ando, N;
Indirizzi:
Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 Sch Agr & Life Sci, Tokyo 1138657, Japan
Titolo Testata:
MOKUZAI GAKKAISHI
fascicolo: 4, volume: 46, anno: 2000,
pagine: 326 - 333
SICI:
0021-4795(2000)46:4<326:EBITMP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLAKEBOARD;
Keywords:
wood-based boards; mat structure; board structure; dimensional stability; internal bond strength;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
3
Recensione:
Indirizzi per estratti:
Indirizzo: Nishimura, T Univ Bath, Dept Mat & Sci & Engn, Bath BA2 7AY, Avon, EnglandUniv Bath Bath Avon England BA2 7AY h BA2 7AY, Avon, England
Citazione:
T. Nishimura et al., "Element behavior in the mat pressing process and properties of the boards", MOKUZAI GAK, 46(4), 2000, pp. 326-333

Abstract

An investigation was made of the dimensional stability of wood-based boards, pressed from elements arranged in four geometrical patterns. Four mat structures (homogeneous packing type, parallel crossed type, reciprocal parallel crossed type, random type) fabricated from elements were tested to evaluate their moisture absorption characteristics. The relationship between thickness swelling, mat structure, specific gravity and internal bond strength were investigated. The pressing process for forming mats was categorised by four characteristic stages. Stage I involves the closing of gaps between elements. Stage II relates to the elastic deformation of elements after closing of gaps. StageIII involves plastic yield of elements arid Stage IV concerns the final consolidation of elements. It was difficult to distinguish between Stage I, II and III deformation for reciprocal parallel crossed-type and random-type mats. Homogeneous packed type and parallel crossed-type mats were well characterised in Stages I, II, III and IV. Each of the four board geometries was produced in Stage II, III and IV forms. Environmental stability was measured following four weeks of exposure to a 90% RH, 26 degrees C environment. Boards which had been subjected to a high degree of compression experienced higher thickness swelling. Thicknessswelling corresponded to stress, which was calculated as load divided by effective section-area. In general, high internal bond strengths were related to high specific gravities with the exception of the homogeneous packed type. In addition, the internal bond strength was closely proportional to the specific gravity for reciprocal crossed type and random type mats. Therefore, it is presumed that the element to element contact areas in reciprocalparallel crossed type and random type mats are closely similar. Boards fabricated with different mat structures exhibit different internal bond strengths even at the same specific gravity values. In conclusion, internal bond strength and thickness swelling of the four types of board are a function of specific gravity, but the arrangement of elements has a dominant effect on the board properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 10:04:53