What are the defects of the plywood?
unsound section unsound knots The decaying part of a section of a child does not exceed 1/3 of the knot.
partially intergrown knOts surrounded by the surrounding wood part of the length of its cross-section around the length of more than 1/4 to 3/4, texture Kuang hard.
dead dead knots formed by the dead branches of trees, knots surrounded by the surrounding wood together, or even only part of the length of its cross-section of the length of about 1/4 or less than 1/4 , Texture hard or soft, and sometimes fall off the formation of empty.
The intergrown knots are formed by the tree's live technique. Knots and the surrounding wood close together or with the surrounding wood part of the length of its cross-section than the length of 3/4, hard texture, normal structure
