Patent US4505869A successfully refreshed from Google Patents.
US4505869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing wood-like molded product
Assignee: Individual
•
Filing: 1983-02-22
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Granted: 1985-03-19
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Expires: 2003-02-22
Abstract
Abstract The present invention relates to a method for manufacturing wood-like molded products comprising the steps of preparing a fine powder of wood material solidified by a thermosetting resin and mixing the same with a resin. More particularly, it relates to a method for manufacturing a molded product having improved quality, and especially the advantages of both wood and plastic by eliminating water and wood vinegar contained in the wood chip aggregate to be mixed and by imparting a surface smoothness.
Inventors
- 👤 Sadao Nishibori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:42
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A method of manufacturing a shaped, synthetic wood-like product comprising sequentially: preparing an aggregate by mixing dry wood meal with a thermosetting urea resin, heating the mixture at a temperature of about 100°-170° C. until the resin is set, to form aggregate having a particle size of 100 mesh or more; reducing the water content of said aggregate to less than 5%, and maintaining said reduced water content during manufacturing; reducing possibility of formation, dissociation or volatilization of wood vinegar or acid gases by said reduced water content and neutralization of said aggregate with urea resin; mixing said aggregate with a thermoplastic resin binder; and heat molding said aggregate/binder mixture into a desired shape.
Claim 2
Independent Claim
114 words
A method of manufacturing a shaped, synthetic wood-like product comprising sequentially: preparing an aggregate by mixing dry wood meal with a thermosetting urea resin, heating the mixture at a temperature of about 100°-170° C. until the resin is set, to form aggregate having a particle size of 100 mesh or more; reducing the water content of said aggregate to less than 5%, and maintaining said reduced water content during manufacturing; reducing possibility of formation, dissociation or volatilization of wood vinegar or acid gases by said reduced water content and neutralization of said aggregate with urea resin; mixing said aggregate with a thermoplastic resin binder; and heat molding said aggregate/binder mixture into a desired shape.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said aggregate water content is reduced to about 3-5%.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said aggregate water content is reduced to as close to 0% as possible.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said aggregate is subjected to heating and drying during its formation.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein said wood meal is subjected to heating and drying before mixing with the urea resin.
Claim 7
Dependent Claim
17 words
The method of claim 5 wherein said aggregate is subjected to heating and drying during its formation.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein said thermoplastic resin binder is a polyvinylchloride.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein said thermoplastic resin binder is an ABS resin or a polystyrene.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein said aggregate particle size is 150 mesh or more.
Claim 11
Dependent Claim
33 words
The method of claim 1 wherein said aggregate is prepared by mixing coarse wood meal with said urea resin, and subjecting the mixture to hot pressing into particles of 120 mesh or more.
Claim 12
Dependent Claim
25 words
The method of claim 10 wherein, after setting, said aggregate is reformed into particles of the desired size by grinding with the use of sandpaper.
Claim 13
Dependent Claim
47 words
The method of claim 1 wherein said aggregate is prepared by pulverizing said wood meal to a fine powder of 100 mesh or more, mixing said fine powder with the urea resin, and thermally setting the mixture by hot air into particles of 100 mesh or more.
References Cited (Backward Citations)
US2033411A
Cited
GB1067940A
Cited
US3736221A
Cited
US3995003A
Cited
US4228116A
Cited
GB1416840A
Cited
US4003866A
Cited
JPS511346A
Cited
US4282120A
Cited
GB1600469A
Cited
US4267285A
Cited
US4376852A
Cited
JPS5725957A
Cited
JPS5796851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |