US4229507A
Expired / Lapsed
US
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Method for drying wood material
Assignee: Asahi Kasei Corp
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Filing: 1979-01-29
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Granted: 1980-10-21
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Expires: 1999-01-29
Abstract
Abstract A dry wood material free from seasoning check is produced with good yield from undried wood material with water content of 50 to 200% by drying the undried wood material while controlling the rate of evaporation of water from the undried wood material by providing on its surface a barrier layer having a water vapor permeability in the specific range from 10 to 100 g/m 2 .day.
Inventors
- 👤 Tamotsu Kai
- 👤 Michio Tsurumi
- 👤 Takashi Sakakiyama
- 👤 Kunihiro Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:09
CPC Classifications
F; F26; F26B; F26B5/00; F26B5/005; F26B1/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31989; Y10T428/4935; Y10T428/662
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
80 words
A method for drying a wood material, which comprises drying an undried wood material having a water content of from 50 to 200 wt.% while controlling the rate of evaporation of water from said wood material by providing on the surface of said wood material a continuous polymeric film barrier layer having a water vapor permeability in the range from 10 to 100 g/m 2 .day (as measured under the condition of the relative humidity of 90% at 37.8° C.).
Claim 2
Independent Claim
80 words
A method for drying a wood material, which comprises drying an undried wood material having a water content of from 50 to 200 wt.% while controlling the rate of evaporation of water from said wood material by providing on the surface of said wood material a continuous polymeric film barrier layer having a water vapor permeability in the range from 10 to 100 g/m 2 .day (as measured under the condition of the relative humidity of 90% at 37.8° C.).
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein the wood material is a log, a primarily worked square, cylindrical or board lumber or a mass of these lumbers.
Claim 4
Dependent Claim
23 words
A method according to claim 2, wherein the wood material is an integrally combined bundle of two or more square or board lumbers.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein the polymeric film is made of a copolymer of vinyl acetate with a mono-olefinic monomer.
Claim 6
Dependent Claim
23 words
A dry wood material free from seasoning check with less than 50 wt % water content, which is prepared according to claim 4.
Claim 7
Dependent Claim
36 words
A method according to claim 1, wherein the polymeric film is made of a copolymer of an aliphatic conjugated diolefin monomer with an alkenyl aromatic monomer or a copolymer of these monomers with another mono-olefinic monomer.
Claim 8
Dependent Claim
23 words
A dry wood material free from seasoning check with less than 50 wt. % water content, which is prepared according to claim 6.
Claim 9
Dependent Claim
53 words
A method according to claim 1, wherein the continuous polymeric film is formed by applying a treating agent containing a polymeric substance in the form of a solution, a suspension or an emulsion in a medium on the surface of the wood material and then evaporating the medium to form the continuous film.
Claim 10
Dependent Claim
23 words
A dry wood material free from seasoning check with less than 50 wt. % water content, which is prepared according to claim 8.
Claim 11
Dependent Claim
17 words
A method according to claim 8, wherein the treating agent is applied by dipping, coating or spraying.
Claim 12
Dependent Claim
18 words
A method according to claim 8, wherein the treating agent is in the form of an aqueous emulsion.
Claim 13
Dependent Claim
23 words
A method according to claim 11, wherein the aqueous emulsion has a minimum film-forming temperature in the range from 0° to 40° C.
Claim 14
Dependent Claim
22 words
A dry wood material free from seasoning check with less than 50 wt.% water content, which is prepared according to claim 12.
Claim 15
Dependent Claim
23 words
A dry wood material free from seasoning check with less than 50 wt % water content, which is prepared according to claim 1.
Claim 16
Dependent Claim
96 words
A wood material controlled in the rate of evaporation of water from the surface thereof, comprising an undried wood material having a water content of from 50 to 200 wt.% and a barrier layer provided on the surface of said wood material in an amount of 10 to 200 g (dry weight) per square meter of the surface area, said barrier layer being a continuous polymeric film having a water vapor permeability in the range from 10 to 100 g/m 2 .day (as measured under the condition of the relative humidity of 90% at 37.8° C.).
Claim 17
Dependent Claim
96 words
A wood material controlled in the rate of evaporation of water from the surface thereof, comprising an undried wood material having a water content of from 50 to 200 wt.% and a barrier layer provided on the surface of said wood material in an amount of 10 to 200 g (dry weight) per square meter of the surface area, said barrier layer being a continuous polymeric film having a water vapor permeability in the range from 10 to 100 g/m 2 .day (as measured under the condition of the relative humidity of 90% at 37.8° C.).
Claim 18
Dependent Claim
29 words
A wood material according to claim 15, wherein the undried wood material is a log, a primarily worked square, cylindrical or board lumber or a mass of these lumbers.
Claim 19
Dependent Claim
25 words
A wood material according to claim 16, wherein the undried wood material is an integrally combined bundle or two or more square or board lumbers.
Claim 20
Dependent Claim
23 words
A wood material according to claim 15, wherein the polymeric film is made of a copolymer of vinyl acetate with a mono-olefinic monomer.
Claim 21
Dependent Claim
37 words
A wood material according to claim 15, wherein the polymeric film is made of a copolymer of an aliphatic conjugated diolefin monomer with an alkenyl aromatic monomer or a copolymer of these monomers with another mono-olefinic monomer.
Claim 22
Dependent Claim
29 words
A wood material according to claim 15, wherein the continuous polymeric film is formed from a solution, a suspension or an emulsion of a polymeric substance in a medium.
Claim 23
Dependent Claim
17 words
A wood material according to claim 20, wherein the polymeric film is formed from an aqueous emulsion.
Claim 24
Dependent Claim
24 words
A wood material according to claim 21, wherein the aqueous emulsion has a minimum film-forming temperature in the range from 0° to 40° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |