the materials for bed board and supporting board（plywood，veneer）；its production procedures are；peel cutting the logs by rotation to get thin wood sheets，drying， gelatinizing（smear glue），layer assembly{keep wood lines （grain）of the attached layers across each other at right angle），heating at 100--150°c, then be pressed under press machine，the quality standards can be national standard or made by both sides（supplier and buyer）
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