US3894904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing synthetic paper laminates
Assignee: Fort James Corp
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Filing: 1973-06-11
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Granted: 1975-07-15
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Expires: 1993-06-11
Abstract
Abstract Synthetic paper comprises a laminate of at least three layers bonded together, one layer being a fractured, unidirectionally or uniaxially stretched, thermoplastic resin containing minute particles of an inorganic filler and microvoids between the resin and filler providing a printing surface. A bonding layer adhered to the inorganic filler-containing layer is of tough, unfractured, unidirectionally or uniaxially stretched, thermoplastic film and provides an intermediate layer which is bonded to a foundation sheet or layer providing support and imparting strength to the laminate. The microvoids in the inorganic filler-containing layer are formed by first providing a bilaminate of the inorganic filler-containing layer and the intermediate layer and stretching both layers simultaneously in only one direction (the machine direction), after which the foundation sheet is bonded to the intermediate layer. Thus, tentering apparatus for stretching the laminate in a direction transverse to the machine direction is obviated.
Inventors
- 👤 Stephen O Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:52
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/32; B32B37/00; B32B37/14; B32B37/144; B32B37/15; B32B37/153; B32B38/00; B32B38/0012; B32B7/00; B32B7/04; B32B7/12; B44; B44D; B44D3/00; B44D3/18; B32B2305/00; B32B2305/30; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10S428/00; Y10S428/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
THE METHOD OF MAKING A SYNTHETIC PAPER LAMINATE COMPOSED OF AT LEAST THREE LAYERS WHICH COMPRISES FORMING A BILAMINATE CONSISTING OF A LAYER OF A FRACTURABLE FILM OF A THERMOPLASTIC RESIN CONTAINING MINUTE PARTICLES OF AN INORGANIC FILLER AND A CARRIER LAYER FOR SAID FILLER-CONTAINING LAYER OF A STRETCHABLE, NON-BRITTLE, PLASTIC, HEAT SEALABLE FILM HAVING ONE FACE THEREOF BONDED TO FACE OF THE FILLER-CONTAINING FILM, WHILE SAID LAYERS ARE BONDED TOGETHER SIMULTANEOUSLY STRETCHING BOTH LAYERS OF SAID BILAMINATE IN ONLY ONE DIRECTION WHILE MOVING SAID BILAMINATE IN SAID DIRECTION TO EFFECT FRACTURING OF SAID FILLER-CONTAINING FILM AND FORMATION OF MICROOIDS BETWEEN THE RESIN THEREOF AND THE FILLER TO THEREBY PROVIDE SAID FRACTURED FILM WITH A PRINTING SURFACE, AND AFTER SAID SIMULTANEOUS STRETCHING OF SAID BILAMINATE HAS BEEN COMPLETED AND WHILE SAID FILLER-CONTAINING LAYER IS SUPPORTED BY AND BONDED TO SAID PLASTIC HEAT SEALABLE FILM EFFECTING BONDING BY HEAT AND PRESSURE OF ONE FACE OF A FOUNDATION SHEET TO THE OPOSITE FACE OF SAID PLASTIC HEAT SEALABLE FILM.
Claim 2
Independent Claim
167 words
THE METHOD OF MAKING A SYNTHETIC PAPER LAMINATE COMPOSED OF AT LEAST THREE LAYERS WHICH COMPRISES FORMING A BILAMINATE CONSISTING OF A LAYER OF A FRACTURABLE FILM OF A THERMOPLASTIC RESIN CONTAINING MINUTE PARTICLES OF AN INORGANIC FILLER AND A CARRIER LAYER FOR SAID FILLER-CONTAINING LAYER OF A STRETCHABLE, NON-BRITTLE, PLASTIC, HEAT SEALABLE FILM HAVING ONE FACE THEREOF BONDED TO FACE OF THE FILLER-CONTAINING FILM, WHILE SAID LAYERS ARE BONDED TOGETHER SIMULTANEOUSLY STRETCHING BOTH LAYERS OF SAID BILAMINATE IN ONLY ONE DIRECTION WHILE MOVING SAID BILAMINATE IN SAID DIRECTION TO EFFECT FRACTURING OF SAID FILLER-CONTAINING FILM AND FORMATION OF MICROOIDS BETWEEN THE RESIN THEREOF AND THE FILLER TO THEREBY PROVIDE SAID FRACTURED FILM WITH A PRINTING SURFACE, AND AFTER SAID SIMULTANEOUS STRETCHING OF SAID BILAMINATE HAS BEEN COMPLETED AND WHILE SAID FILLER-CONTAINING LAYER IS SUPPORTED BY AND BONDED TO SAID PLASTIC HEAT SEALABLE FILM EFFECTING BONDING BY HEAT AND PRESSURE OF ONE FACE OF A FOUNDATION SHEET TO THE OPOSITE FACE OF SAID PLASTIC HEAT SEALABLE FILM.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the forming of the bilaminate is by simultaneously extruding the layers from a coextruder onto a casting roll.
Claim 4
Dependent Claim
28 words
The method of claim 2 wherein said stretching of the bilaminate is effected only in the machine direction, and in a water bath at room temperature or lower.
Claim 5
Dependent Claim
46 words
The method of claim 2 wherein the bilaminate is conducted from said casting roll through differential speed rolls so as to uniaxially stretch the bilaminate and then to heated laminating rolls which bond the foundation sheet to said opposite face of said plastic heat sealable film.
Claim 6
Dependent Claim
54 words
The method of claim 1 wherein the resin of the fractured film is of high density polyethylene having a density above about 0.925, a melt index above about 5.0, and a thickness of about 0.5 to 2.5 mil, and said plastic heat sealable film has a stretchability of at least about 350% without breaking.
Claim 7
Dependent Claim
51 words
The method of claim 1 wherein a second bilaminate of the same character as the bilaminate recited by said claim is formed in the same way, and the plastic heat sealable film of said second bilaminate is simultaneously bonded by heat and pressure to the opposite face of said foundation sheet.
Claim 8
Independent Claim
161 words
THE METHOD OF MAKING A SYNTHETIC PAPER LAMINATE COMPOSED OF AT LEAST THREE LAYERS WHICH COMPRISES FORMING A BILAMINATE BY EXTRUDING A BRITTLE FRACTURABLE HIGH MELT INDEX POLYOLEFIN FILM CONTAINING MINUTE PARTICLES OF AN INORGANIC FILLER, WHICH FILM IS SUBSEQUENTLY FRACTURED BY STRETCHING EFFECTING BONDING THEREOF TO A HEAT SEALABLE TOUGH STRETCHABLE WHICH FILM TO FORM A BILAMINATE COMPOSED OF TWO LAYERS IN WHICH SAID TOUGH STRETCHABLE PLASTIC FILM PROVIDES SUPPORT FOR THE FRACTURABLE FILM DURING SAID SUSEQUENT STRETCHING, AFTER SAID BILAMINTE IS FORMED SIMULTANEOUSLY STRETCHING, BOTH LAYERS THEREOF IN ONLY ONE DIRECTION WHILE SAID BILAMINTE IS CONTINUOUSLY MOVED THROUGH A WATER BATH, COMPENSATING FOR HEAT WHICH MAY DEVELOP DURING THE STRETCHING BY PROVIDING SUCH WATER BATH AT ROOM TEMPERATURE OR LOWER, AND AFTER SAID STRETCHING HAS BEEN COMPLETED EFFECTING BONDING UNDER HEAT AND PRESSURE OF A FOUNDATION SHEET TO SAID HEAT SEALABLE LAYER TO FORM AT LEAST SAID THREE LAYERS WHEREIN SAID HEAT SEALABLE PLASTIC LAYERS IS AN INTERMEDIATE LAYER.
Claim 9
Independent Claim
161 words
THE METHOD OF MAKING A SYNTHETIC PAPER LAMINATE COMPOSED OF AT LEAST THREE LAYERS WHICH COMPRISES FORMING A BILAMINATE BY EXTRUDING A BRITTLE FRACTURABLE HIGH MELT INDEX POLYOLEFIN FILM CONTAINING MINUTE PARTICLES OF AN INORGANIC FILLER, WHICH FILM IS SUBSEQUENTLY FRACTURED BY STRETCHING EFFECTING BONDING THEREOF TO A HEAT SEALABLE TOUGH STRETCHABLE WHICH FILM TO FORM A BILAMINATE COMPOSED OF TWO LAYERS IN WHICH SAID TOUGH STRETCHABLE PLASTIC FILM PROVIDES SUPPORT FOR THE FRACTURABLE FILM DURING SAID SUSEQUENT STRETCHING, AFTER SAID BILAMINTE IS FORMED SIMULTANEOUSLY STRETCHING, BOTH LAYERS THEREOF IN ONLY ONE DIRECTION WHILE SAID BILAMINTE IS CONTINUOUSLY MOVED THROUGH A WATER BATH, COMPENSATING FOR HEAT WHICH MAY DEVELOP DURING THE STRETCHING BY PROVIDING SUCH WATER BATH AT ROOM TEMPERATURE OR LOWER, AND AFTER SAID STRETCHING HAS BEEN COMPLETED EFFECTING BONDING UNDER HEAT AND PRESSURE OF A FOUNDATION SHEET TO SAID HEAT SEALABLE LAYER TO FORM AT LEAST SAID THREE LAYERS WHEREIN SAID HEAT SEALABLE PLASTIC LAYERS IS AN INTERMEDIATE LAYER.
References Cited (Backward Citations)
US3790435A
Cited
US3765999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |