By Franz F.P. Kollmann, E.W. Kuenzi, A.J. Stamm

The primary writer released the 1st variation of a e-book entitled in German "Technologie des Holzes" (Springer-Verlag) within the 12 months 1936. This publication used to be to be had in simple terms in photostat replica shape within the usa in the course of international conflict n. A translation into the English language used to be later made in Australia. because of many hampering components because of international conflict n it was once now not unti11951 that the second one variation of the 1st quantity of thir: ebook with the enlarged name (translated) "Technology of 'Vood and W ood established fabrics" used to be released. The se co nd quantity in 1955. The enormOllS enlargement of wooden seience and expertise inside of below deeade: is clear from a comparability of the variety of pages of those variants. the 1st version eomprises 764 pages, the 2 volumes of the second one version 2231 pages. extra lately, it becamc obtrusive that an English model in a condensed up to-date shape was once wanted. consequently, the critical writer determined to submit a e-book on "Principles of W ood technology and expertise" in English. the 1st quantity handled good wooden, this moment quantity bargains with wooden established fabrics. U sing the ward "Principles" within the name of the condensed e-book this led on to leaving behind ft11 targeted historie al experiences, motives, ftnd discussions of mftchines and strategies.

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Relatively high resistance of the glue joints against the influence of moisture. Therefore the structural parts glued with casein glues do not tend to delaminate. 2. A low sensitivity against elevated temperatures. S. Forest Products Laboratory (1956) casein glues may be superior in their behavior to some synthetic resin glues up to 33 oe (91°F) temperature and relative humidity as low as 20%. 3. Casein is a bettel' gap-filling glue than many others. Therefore, it is possible to glue even relatively rough wood surfaces with favorable results but one has to consider that the rate of bonding decreases with joint thickness.

P. g. not only the temperature and pressure, but also the open and closed assembly time. ) Staining of veneer is less for hide glues than for bone glues; it is influenced by the free acidity of the glues. ln. 36. Relation hetween gIlling (joining) prt'sslire and shear stTength 01 joints; ydlow birch blocks glued with an anima I glne. Frolll Truax (1929) t-I 120 ~-kp/cm 2 'S, 80 c 60 //1' / ~ x 40 ;/ ~-- ~/ \\ /' x ~ \/ /.. ~// . /! _. --20% concentrotion I i - /' /,,; // // 20 I x x ~•. / \. ~ Jf ~/J- / 100 r1--- X _ ,x~.

P. " The general relation of quantity of glue spread to joint strength is illustrated in Fig. 29. /l,OOO sq. ) for plywood gives the highest strength. 2. Usually stareh glues contain eaustie soda redueing the viseosity and prolonging the pot-life, but eausing staining. 49). in 300 I / / i"'"" "'Tl'-- r--....... I 100 100 200 300 400 Quantity 01 glue spread 500 600 g/ mZ 100 Fig. 29. Elfect of quantity of glue spread 01\ joint strength of vegetable glue; three-ply cross-banded panels of 1/16 in.

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