Factors affecting particleboard pressing time: interaction with catalyst systems
U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1973 - 20 ページ
In laboratory manufacture of particleboards, use of catalyst, high press temperature, fast closing, and nonuniform mat moisture content produced adequate 1/2-inch-thick, urea-bonded panels in 1 minute and phenolic-bonded panels in 2 minutes presstime. The use of a catalyst allows the reduction of presstime by approximately 1 minute for urea-formaldehyde resin systems, but no reduction was obtained with catalyzed phenol-formaldehyde systems. (Author).
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3/4-inch board ammonium chloride aspen and southern based on liquid:liquid bonded Douglas-fir flakeboards CATALYST TYPE catalyst with factors catalyzed resin catalyzed urea resin cauls centerline temperatures Chromium core 1 pet cure rate data showing interaction Douglas-fir board face and core factors influencing minimum FAST CURE fast-curing phenolic Final pressure gravity at test heat transfer Hot Pressing Inch Standard Catalyst influencing minimum presstlme Initial temperature rise interaction of catalyst internal bond strength l-l/2 minutes l-minute reduction l/4 minute l5-second closing liquid:liquid weights mat moisture content mat moisture distribution MINIMUM PRESS minimum presstime minimum presstlme urea-bonded minute presstime p.c.f. boards p.s.i. closing pressure panels percent catalyst percent of catalyst phenol-formaldehyde phenolic-bonded boards phenolic-bonded exterior potassium chromate presstlme urea-bonded interior reducing presstimes reduction in presstime reduction of presstime Resin Catalyst southern pine boards species Specific gravity standard phenolic resin Temperature and closing thicker boards thickness ture ness urea-formaldehyde Variation on standard