Patent US4315050A successfully refreshed from Google Patents.
US4315050A
Expired / Lapsed
US
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Laminates structure of an expanded core panel and a flat sheet of material which does not easily bond and a process for making the same
Assignee: Shawmut Bank Connecticut NA
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Filing: 1980-01-25
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Granted: 1982-02-09
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Expires: 2000-01-25
Abstract
Abstract A method of bonding a sheet of hard to bond thermoformable material to a core made of expanded thermoformable material is disclosed. The sheet of thermoformable material is heated to its glass transition temperature and then pressed into voids in the core forming a mechanical bond in addition to the chemical bond.
Inventors
- 👤 Rosemary Rourke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:06
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/303; B29C66/3032; B29C66/30325; B29C66/30326; B29C66/40; B29C66/41; B29C66/45; B29C66/70; B29C66/71; B29C66/72; B29C66/727; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91421; B29C66/91441; B29C66/91443; B29C66/91445; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/91935; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B3/00; B32B3/26; B32B3/30; B32B38/00; B32B38/08; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C66/91423; B29C66/92; B29C66/924; B29C66/9261; B29C66/92611; B29C66/929; B29C66/94; B29C66/949; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B32B2305/00; B32B2305/02; B32B2305/022; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A method of forming a composite member having a panel of expanded thermoformable material with a plurality of voids, as a core and at least one sheet of the same material attached thereto, comprising the steps of: disposing at least one face portion of a layer of expanded thermoformable material adjacent to a face portion of a layer of a sheet of same material; disposing the layers between two platens of a press; heating at least one platen adjacent to the sheet of the same material to its melting temperature at the point of contact between said layers; moving said presses together thereby squeezing material from the sheet of the same material into voids of said expanded thermoformable material; cooling said at least one platen; and removing said composite member from said platnes.
Claim 2
Independent Claim
133 words
A method of forming a composite member having a panel of expanded thermoformable material with a plurality of voids, as a core and at least one sheet of the same material attached thereto, comprising the steps of: disposing at least one face portion of a layer of expanded thermoformable material adjacent to a face portion of a layer of a sheet of same material; disposing the layers between two platens of a press; heating at least one platen adjacent to the sheet of the same material to its melting temperature at the point of contact between said layers; moving said presses together thereby squeezing material from the sheet of the same material into voids of said expanded thermoformable material; cooling said at least one platen; and removing said composite member from said platnes.
Claim 3
Dependent Claim
48 words
The method according to claim 1 whrein at least some of said voids in said thermoformable material have a portion recessed with respect to said face portion whereby when said material from said sheet is squeezed into said voids and cools, it will form a mechanical interlock therewith.
Claim 4
Dependent Claim
48 words
A method according to claim 1 wherein said step of disposing at least one face portion of a layer of expanded thermoformable material comprises the step of disposing both face portions of a layer of expanded thermoformable material adjacent a layer of a sheet of the same material.
Claim 5
Dependent Claim
24 words
A method according to claim 3 wherein said step of heating comprises heating both platens and said step of cooling comprises cooling both platens.
Claim 6
Dependent Claim
58 words
A method according to claim 1 wherein said material is polypropylene and wherein said step of heating said platen comprises the steps of: p1 raising the temperature of the platen from temperature of approximately 100° F. to a temperature of approximately 430° F. in about 11/2 minutes; and holding the temperature at 4302 F. for about 21/2 minutes.
Claim 7
Dependent Claim
27 words
A method in accordance with claim 5 wherein said step of cooling comprises: lowering the temperature to about 100° F. over a priod of approximately 10 minutes.
Claim 8
Dependent Claim
57 words
A method in accordance with claim 4 wherein said material is polypropylene and said step of heating said platens comprises the steps of: raising the temperature of the pltens from temperature of approximately 100° F. to a temperature of approximately 430° F. in about 11/2 minutes; and holding the temperature at 4302 F. for about 21/2 minutes.
Claim 9
Dependent Claim
30 words
A method in accordance with claim 7 wherein said step of cooling comprises the step of lowering the temperature to about 100° F. over a period of approximately 10 minutes.
Claim 10
Dependent Claim
64 words
A method in accordance with claim 1 further comprising the steps of: determining the desired cross sectional thickness of the composite member; and selecting the panel of expanded thermoformable material and the at least one sheet of the same material to have a combined cross sectional thickness of approximately 1/8 to 1/4 inch more than the desired cross sectional thickness of the composite member.
Claim 11
Dependent Claim
102 words
A composite member comprising: a panel of expanded thermoformable material having a plurality of voids, each of said voids having an opening on at least one surface of said expanded panel, said opening having an area smaller than an interior cross sectional area of said void; and at least one layer of hard to bond thermoformable material attached to said panel and having a plurality of projections into said voids, and each of said projections having a cross sectional area at the interior of said voids which is greater than the area of said openings made by the method of claim 1.
Claim 12
Dependent Claim
11 words
The composite member of claim 10 having openings at both surfaces.
Claim 13
Dependent Claim
15 words
The composite member of claim 11 having two layers of hard to bond thermoformable material.
Claim 14
Dependent Claim
14 words
The composite member of claim 10 wherein said expanded panel is made of polypropylene.
Claim 15
Dependent Claim
20 words
The composite member of claim 10 wherein said layer of hard to bond thermoformable materal is a layer of polypropylene.
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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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |