Vacuum lumber drying kiln with collapsing cover and method...

Details Vacuum lumber drying kiln with collapsing cover and method... Vacuum lumber drying kiln with collapsing cover and method...

2005-03-15

2005-03-15

Wilson, Pamela A (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor pressure varies during treatment

C034S411000, C034S412000, C034S417000, C034S518000, C034S092000, C034S225000, C034S231000

Reexamination Certificate

active

06865821

ABSTRACT:
A lumber drying kiln employs outside air pressure uses a flexible collapsing bag or cover alone or in combination with walls. The collapsing bag seals against a base to maintain the vacuum. The air pressure against the flexible top keeps the lumber layers from warping or cupping during drying. The lumber stack has alternating layers of hot plates or stickers separating layers of lumber. A bag having an open bottom and made of nylon-reinforced rubber or other strong flexible material is placed over the wood and sealed to the stainless steel platform. A vacuum pump is connected with the bag by means of a manifold and operated to remove air from the enclosed lumber stack, the vacuum strengthening the seal between the base and the bottom of the bag. This chamber design is easily scaled up or down to provide a desired drying capacity.

REFERENCES:
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patent: 5123177 (1992-06-01), Koetter et al.
patent: 5199186 (1993-04-01), Rice et al.
patent: 5678618 (1997-10-01), Lindhe et al.
patent: 6161365 (2000-12-01), Girard et al.
patent: 6317997 (2001-11-01), Kooznetsoff et al.
patent: 6640462 (2003-11-01), Choi et al.

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