Wyniki wyszukiwania - BazTech

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Possibility of the production of three-layer MDF

Nicewicz D., Klimczewski M.

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

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2014

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No. 88

162--169

EN

The paper proposes the production of a three-layer MDF instead one layer boards. Three-layer panels have been made from fibers of varying dimensions for the outer and the core layers. The outer layers were produced from standard fibers, while the core layer from longer and thicker fibers (of lower pulp freeness). In order to determine the optimal technological parameters in the production of three layer boards, the experimental plan was used in the study. Three factors at two levels were tested. Analysis of variance (ANOVA) was used to analyze the significance of factors. Regression coefficients and 3D contour plots were used to quantify the relationship between panel properties and test factors. Properties of obtained boards were tested according to the standard EN 622-5/2010. All selected factors within the examined range of settings had influence on MDF properties. It has been found that the best properties of the plates were 25x50x25 involving layers, the content of the glue in the outer layers of 10% and the core layer of 12% at the time of overheating of the mats 90s.

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An attempt to use postconsumer MDF as a raw material for the manufacture of particleboards

Borysiuk P., Byczek M., Jenczyk-Tołłoczko I., Boruszewski P., Monder S.

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

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2014

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No. 87

7--11

EN

An attempt to use postconsumer MDF as a raw material for the manufacture of particleboards. The aim of the study was to determine the influence of addition of mechanically grinded postconsumer MDF to the inner layer of particleboards on its properties. Three-layer particleboards with a predetermined density of 650 kg/m3 and a thickness of 16 mm and a weight fraction of MDF particles of 10, 20, 30 and 50 % to the inner layer were prepared. Manufactured boards were tested for the density and density distribution, MOR, MOE, IB, swelling and water absorption after 2 and 24 hours soaking in water. It was observed, that the addition of grinded postconsumer MDF to the inner layer of particleboards (in amount of 10 – 50 %) generally does not have negative effect on their mechanical properties and has a positive influence on the reduction of swelling and water absorption, especially when exposed to water for 24 h.

3

Wpływ zmian zachodzących podczas składowania trocin sosnowych na właściwości płyt wytwarzanych z ich zastosowaniem

Frąckowiak I.

Drewno : prace naukowe, doniesienia, komunikaty

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2005

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vol. 48, nr 173

81-94

PL

W artykule przedstawiono skład frakcyjny i pojemność buforową sosnowych trocin tartacznych świeżych (przed składowaniem) oraz składowanych przez pół roku w warunkach przemysłowych. Omówiono wpływ czasu i położenia trocin w hałdach na te właściwości. Wytwarzano trzywarstwowe płyty z trocin składowanych w różnym czasie. Parametry i warunki wytwarzania płyt oraz surowce chemiczne, zgodne z aktualnie stosowanymi w produkcji płyt wiórowych, były czynnikami stałymi. Zbadano wytrzymałość płyt na zginanie statyczne i rozciąganie prostopadłe do płaszczyzn, spęcznienie płyt po moczeniu w wodzie oraz zawartość formaldehydu. Wyniki badań wykazały, że powyższe właściwości płyt są zdeterminowane kwasową pojemnością buforową trocin, której wartość jest ściśle związana z warunkami ich składowania. Od warunków tego procesu zależy, w dużej mierze poziom i stabilność właściwości płyt oraz pośrednio efektywność produkcji.

EN

The process of storing sawdust in the industrial scale was examined in experimental heaps of the following size: height 15 m, width 25 m, and length 45 m. The method of forming the heaps and placing in them study samples stored for different periods of time were described. Throughout the whole storage period,, temperature in the heaps was controlled by means of probes inserted in the heaps when they were formed. Fraction composition and buffer capacity of fresh sawdust (prior to the storage period and when stored already for 4 and 6 month) were examined throughout the whole width of the heaps at different distances from the ground. Fraction composition and buffer capacity of sawdust were determined.