US4263073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for releasing laminates
Assignee: Formica Corp
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Filing: 1979-10-09
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Granted: 1981-04-21
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Expires: 1999-10-09
Abstract
Abstract A novel method of releasing from one another in a press pack, a plurality of heat and pressure consolidated resin-impregnated laminates, including those pressed back-to-back, e.g. decorative laminates, metal clad laminates, veneer backs and the like, which method comprises utilizing, as a separator sheet, a web of phenol-formaldehyde resin-free paper having a water absorption of at least about 200 seconds which has been sized on at least one side thereof, from an aqueous solution, with a water-soluble, alkaline earth or earth metal salt, e.g. a calcium salt such as calcium chloride, and then coated on said sized side with a film of a salt of alginic acid, such as sodium alginate.
Inventors
- 👤 Richard F. Jaisle
- 👤 Walter W. Schiermeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:31
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/06; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/68; D; D21; D21H; D21H27/00; D21H27/001; B29C43/00; B29L; B29L2009/00; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2317/00; B32B2317/12; B32B2317/122; D21H19/00; D21H19/10; D21H19/14; D21H19/34; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041; Y10T156/1043; Y10T156/1044; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/24802; Y10T428/24851; Y10T428/2486
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
A method of releasing laminates from one another in a heat and pressure consolidated press pack which comprises (1) arranging a plurality of thermosetting synthetic resin-impregnated fibrous core sheets in superimposed relationship in groups of at least two stacks, (2) separating each of said two stacks from one another with a pair of separator sheets, each separator sheet comprising a web of phenol-formaldehyde resin-free paper having a water absorption of at least about 200 seconds, only one side of which has been sized with a water-soluble salt of an alkaline earth metal or earth metal in an amount sufficient to provide a solids content of said salt distributed throughout the sized surface of said web ranging from about 0.001% to about 10%, by weight, based on the dry weight of the sized web, and then coated on its sized side with at least 0.5 lbs. per ream of a film of a salt of alginic acid, the alginic acid salt coated side of each of said separator sheets in said pair facing one another, (3) consolidating said stacks of core sheets and said separator sheets by the application of heat and pressure thereto and, (4) separating the resulting laminates from one another at the locus of said alginic acid salt coated sides of said separator sheets, the bottommost surface of each resulting laminate constituting one of said separator sheets.
Claim 2
Independent Claim
229 words
A method of releasing laminates from one another in a heat and pressure consolidated press pack which comprises (1) arranging a plurality of thermosetting synthetic resin-impregnated fibrous core sheets in superimposed relationship in groups of at least two stacks, (2) separating each of said two stacks from one another with a pair of separator sheets, each separator sheet comprising a web of phenol-formaldehyde resin-free paper having a water absorption of at least about 200 seconds, only one side of which has been sized with a water-soluble salt of an alkaline earth metal or earth metal in an amount sufficient to provide a solids content of said salt distributed throughout the sized surface of said web ranging from about 0.001% to about 10%, by weight, based on the dry weight of the sized web, and then coated on its sized side with at least 0.5 lbs. per ream of a film of a salt of alginic acid, the alginic acid salt coated side of each of said separator sheets in said pair facing one another, (3) consolidating said stacks of core sheets and said separator sheets by the application of heat and pressure thereto and, (4) separating the resulting laminates from one another at the locus of said alginic acid salt coated sides of said separator sheets, the bottommost surface of each resulting laminate constituting one of said separator sheets.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said water-soluble salt is a salt of an alkaline earth metal.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein said water-soluble salt is a salt of an earth metal.
Claim 5
Dependent Claim
15 words
A method according to claim 1 wherein said water-soluble salt is a salt of calcium.
Claim 6
Dependent Claim
15 words
A method according to claim 1 wherein said salt of alginic acid is sodium alginate.
Claim 7
Dependent Claim
24 words
A method according to claim 1 wherein said water-soluble salt is a salt of calcium and said salt of alginic acid is sodium alginate.
Claim 8
Dependent Claim
13 words
A method according to claim 1 wherein said paper is corrugating medium kraft.
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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |