Title:
HIGH-DENSITY LIGNEOUS MATERIAL AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3163352
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high-density ligneous material which is excellent in bend strength, surface properties, and dimensional stability in spite of its lightness in weight and does not generate warps and torsions by heightening specific gravities of only top and rear faces without heightening the whole specific gravity of a base material so as to form hard layers on the top and rear faces.
SOLUTION: A ligneous material whose water content is adjusted to a fiber saturation point or below is pinched in between hot plates, heated and compressed at a temperature below a softening point temperature of a cellulose as a crystal component of the ligneous material and above a softening point temperature in water content after adjustment of a non-crystal component. Thereafter, the compression is released and cooled, so that a ligneous material having densified hard layers 2 on the top and rear faces of the ligneous material is obtained. A butt end edge of the high-density ligneous material 1 is waterproofed. The waterproofing can be performed by sticking an edge sticking material 5 to the but end edge or by impregnating the butt end edge with a synthetic resin.
Inventors:
Tomoyasu Honda
Application Number:
JP34541395A
Publication Date:
May 08, 2001
Filing Date:
December 11, 1995
Export Citation:
Assignee:
Noda Co., Ltd.
International Classes:
B27K3/34; B27K5/00; B27K5/06; B27M1/08; B27M3/00; (IPC1-7): B27K5/00
Domestic Patent References:
| JP6131205A | ||||
| JP8224706A | ||||
| JP585937U | ||||
| JP4115604U |