US5143768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated dieboard structure
Assignee: Weyerhaeuser Co
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Filing: 1991-08-30
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Granted: 1992-09-01
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Expires: 2011-08-30
Abstract
Abstract This invention is directed to a dieboard comprising a rigid core of a plastic material, such as polyurethane, having a polyurea-cellulose composite secured to its opposed major surfaces. The polyurea-cellulose composite imparts substantial dimensional stability to the laminated dieboard. A layer of a liquid impermeable material, such as a film, can be secured to the outer major surfaces of the dieboard. By making this outer layer of a light color, such as white, the projection of CAD or hand-drawing slotting templates onto the dieboard surface is facilitated.
Inventors
- 👤 Ronald C. Wilderman
- 👤 David W. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B26; B26F; B26F1/00; B26F1/38; B26F1/44; B32B27/30; B32B27/304; B32B27/40; B32B7/00; B32B7/04; B32B7/12; B26F1/40; B26F2001/4463; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2307/726; B32B2307/7265; B32B2375/00; Y; Y10; Y10S; Y10S76/00; Y10S76/06; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/234; Y10T428/236; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31591
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
107 words
A laminated dieboard structure comprising a core having first and second opposed major surfaces, the core being of a plastic material of a density of from ten to thirty pounds per cubic foot; first and second cover sheets each having opposed major surfaces, the core being positioned between respective major surfaces of the cover sheets to form the laminated structure, the cover sheets each comprising cellulosic material impregnated with a heat-curable polyisocyanate within a range of from about eight percent to about thirty percent by weight of polyisocyanate to cellulosic material, the polyisocyanate being heat cured under conditions of temperature and pressure to form a polyurea-cellulose composite.
Claim 2
Dependent Claim
107 words
A laminated dieboard structure comprising a core having first and second opposed major surfaces, the core being of a plastic material of a density of from ten to thirty pounds per cubic foot; first and second cover sheets each having opposed major surfaces, the core being positioned between respective major surfaces of the cover sheets to form the laminated structure, the cover sheets each comprising cellulosic material impregnated with a heat-curable polyisocyanate within a range of from about eight percent to about thirty percent by weight of polyisocyanate to cellulosic material, the polyisocyanate being heat cured under conditions of temperature and pressure to form a polyurea-cellulose composite.
Claim 3
Dependent Claim
23 words
A dieboard structure according to claim 1 wherein each cover sheet comprises plural plies of cellulosic material impregnated with the polyisocyanate and cured.
Claim 4
Dependent Claim
21 words
A dieboard structure according to claim 1 in which each cover sheet is from about 0.075 to about 0.2 inches thick.
Claim 5
Dependent Claim
21 words
A dieboard structure according to claim 1 in which each cover sheet is from about 0.1 to about 0.15 inches thick.
Claim 6
Dependent Claim
30 words
A dieboard structure according to claim 1 in which each cover sheet is about 0.13 inches thick and the density of the core is about fifteen pounds per cubic foot.
Claim 7
Dependent Claim
16 words
A dieboard structure according to claim 1 in which the core is of a polyurethane material.
Claim 8
Dependent Claim
26 words
A dieboard structure according to claim 1 which absorbs no more than about four percent water when soaked in a bath of water for ninety-six hours.
Claim 9
Dependent Claim
43 words
A dieboard structure according to claim 1 including a layer of a liquid and water vapor impermeable surface forming material overlaying a major surface of at least one of the cover sheets and which is exposed to the exterior of the dieboard structure.
Claim 10
Dependent Claim
16 words
A dieboard structure according to claim 8 in which the surface forming material comprises a film.
Claim 11
Dependent Claim
22 words
A dieboard structure according to claim 9 in which the film is bonded to the cover sheet during curing of the polyisocyanate.
Claim 12
Dependent Claim
16 words
A dieboard structure according to claim 10 in which the film is a polyvinyl fluoride film.
Claim 13
Dependent Claim
68 words
A dieboard structure according to claim 1 including a first layer of a liquid and water vapor impermeable surface forming material overlaying a major surface of the first cover sheet and a second layer of a liquid and water vapor impermeable surface forming material overlaying a major surface of the second cover sheet, the layers of surface forming material being exposed to the exterior of the dieboard structure.
Claim 14
Dependent Claim
17 words
A dieboard structure according to claim 12 in which the surface forming material is a light color.
Claim 15
Dependent Claim
18 words
A dieboard structure according to claim 1 having an elongated slot for receiving and retaining a rigid rule.
Claim 16
Dependent Claim
29 words
A dieboard structure according to claim 14 in which the slot is formed by a laser at a rate of from about fifteen to about forty inches per minute.
Claim 17
Dependent Claim
32 words
A dieboard structure according to claim 1 having a thickness of from about 0.5 inches to about 1 inch, a density of from about forty to about forty-three pounds per cubic foot.
Claim 18
Dependent Claim
146 words
A dieboard structure comprising: a core of a plastic material having first and second opposed major surfaces, the core having a density of from about ten to about thirty pounds per cubic foot; first and second cover sheets each having opposed major surfaces, the first cover sheet being secured to and overlaying the first major surface of the core, the second cover sheet being secured to and overlaying the second major surface of the core, each of the cover sheets comprising cellulosic material impregnated with a heat-curable polyisocyanate within a range of about 8 percent to about 30 percent by weight of polyisocyanate to cellulosic material, the polyisocyanate being heat cured to form a polyurea composite; and a liquid and water vapor impermeable surface forming material overlaying a major surface of each of the cover sheets and being exposed to the exterior of the dieboard structure.
Claim 19
Dependent Claim
146 words
A dieboard structure comprising: a core of a plastic material having first and second opposed major surfaces, the core having a density of from about ten to about thirty pounds per cubic foot; first and second cover sheets each having opposed major surfaces, the first cover sheet being secured to and overlaying the first major surface of the core, the second cover sheet being secured to and overlaying the second major surface of the core, each of the cover sheets comprising cellulosic material impregnated with a heat-curable polyisocyanate within a range of about 8 percent to about 30 percent by weight of polyisocyanate to cellulosic material, the polyisocyanate being heat cured to form a polyurea composite; and a liquid and water vapor impermeable surface forming material overlaying a major surface of each of the cover sheets and being exposed to the exterior of the dieboard structure.
Claim 20
Dependent Claim
17 words
A dieboard structure according to claim 17 having slots or notches for receiving and retaining rigid rule.
Claim 21
Dependent Claim
33 words
A dieboard structure according to claim 18 in which the cover sheets comprise plural plies of cellulosic sheet material, each cover sheet having a thickness of from about 0.1 to about 0.15 inches.
Claim 22
Dependent Claim
85 words
A dieboard structure comprising: a core of a plastic material having first and second opposed major surfaces, the core having a density of from about ten to about thirty pounds per cubic foot; and a cover sheet having first and second major surfaces, the first major surface of the cover sheet overlaying one of the first and second opposed major surfaces of the core to form the dieboard structure, the cover sheet comprising cellulosic material impregnated with a heat-curable polyisocyanate, the polyisocyanate being heat cured.
Claim 23
Dependent Claim
85 words
A dieboard structure comprising: a core of a plastic material having first and second opposed major surfaces, the core having a density of from about ten to about thirty pounds per cubic foot; and a cover sheet having first and second major surfaces, the first major surface of the cover sheet overlaying one of the first and second opposed major surfaces of the core to form the dieboard structure, the cover sheet comprising cellulosic material impregnated with a heat-curable polyisocyanate, the polyisocyanate being heat cured.
Claim 24
Dependent Claim
26 words
A dieboard structure according to claim 20 including a liquid and water vapor impermeable surface forming material overlaying the second major surface of the cover sheet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |