Patent US1612410A successfully refreshed from Google Patents.
US4054701A
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Plastic sheet with a surface treated to enhance adhesion and method of making such sheets
Assignee: RR Donnelley and Sons Co
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Filing: 1976-03-01
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Granted: 1977-10-18
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Expires: 1996-03-01
Abstract
Abstract A sheet of thermoplastic material has a planar surface treated to enhance adhesion of paper thereto by means of an adhesive of the class consisting of animal glue and water base adhesives as used in book binding. The sheet is passed beneath a heated diamond knurling roll at a temperature and pressure, and at a rate to produce a dwell time, which are controlled to form in said planar surface a continuous pattern of small, shallow recesses separated by inter-recess planar areas of said surface, and a raised rim of the thermoplastic material bordering each of said recesses and projecting above the planar areas, a large percentage of said rims having at least a part of their outer periphery overhanging a portion of the adjacent inter-recess planar area.
Inventors
- 👤 Alvin J. Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:18
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/02; B32B3/06; B29; B29C; B29C59/00; B29C59/02; B29C59/022; B32B27/00; B32B27/06; B32B27/10; B32B27/32; B32B3/26; B32B3/30; B42; B42D; B42D3/00; B42D3/02; B29C59/04; B32B2309/00; B32B2309/02; B32B2309/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24628; Y10T428/24669; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31754; Y10T428/31768; Y10T428/31772; Y10T428/31775; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A sheet of thermoplastic material which has had a planar surface treated to enhance adherence of paper thereto by means of an adhesive of the class consisting of animal glues and water base adhesives, said surface being characterized by a continuous pattern of small, shallow recesses separated by inter-recess planar areas of said surface, and a raised rim of the thermoplasitc material bordering each of said recesses and projecting above the planar areas, a large percentage of said rims having at least a part of their outer periphery overhanging a portion of the adjacent inter-recess planar area.
Claim 2
Dependent Claim
97 words
A sheet of thermoplastic material which has had a planar surface treated to enhance adherence of paper thereto by means of an adhesive of the class consisting of animal glues and water base adhesives, said surface being characterized by a continuous pattern of small, shallow recesses separated by inter-recess planar areas of said surface, and a raised rim of the thermoplasitc material bordering each of said recesses and projecting above the planar areas, a large percentage of said rims having at least a part of their outer periphery overhanging a portion of the adjacent inter-recess planar area.
Claim 3
Dependent Claim
30 words
The sheet of claim 1 in which each recess takes the form of a small crater, and each rim extends substantially continuously around the crater that is bordered by it.
Claim 4
Dependent Claim
18 words
The sheet of claim 2 in which the craters are essentially of a diamond shape with sloping sides.
Claim 5
Dependent Claim
39 words
The sheet of claim 2 in which there are about 320 craters per square inch, and each crater and rim is generally oval with a long dimension of about 0.03125 inch and a short dimension of about 0.02 inch.
Claim 6
Dependent Claim
9 words
The sheet of claim 1 which consists of polyethylene.
Claim 7
Independent Claim
144 words
A method of treating a planar surface of a sheet of thermoplastic material to enhance adherence of paper thereto by an adhesive of the class consisting of animal glues and water base adhesives, said method comprising the step of subjecting said planar surface to contact under pressure from a heated member which has a continuous pattern of small, closely adjacent protuberances that displace the thermoplastic material to form in the planar surface a continuous pattern of small recesses, and controlling the temperature of said member, the pressure, and the time of contact so that said recesses are shallow and separated by small inter-recess planar areas, and so that the thermoplastic material displaced to form each recess remains as a raised rim which borders said recess and has at least a part of its outer periphery overhanging a portion of the adjacent inter-recess planar area.
Claim 8
Independent Claim
144 words
A method of treating a planar surface of a sheet of thermoplastic material to enhance adherence of paper thereto by an adhesive of the class consisting of animal glues and water base adhesives, said method comprising the step of subjecting said planar surface to contact under pressure from a heated member which has a continuous pattern of small, closely adjacent protuberances that displace the thermoplastic material to form in the planar surface a continuous pattern of small recesses, and controlling the temperature of said member, the pressure, and the time of contact so that said recesses are shallow and separated by small inter-recess planar areas, and so that the thermoplastic material displaced to form each recess remains as a raised rim which borders said recess and has at least a part of its outer periphery overhanging a portion of the adjacent inter-recess planar area.
Claim 9
Dependent Claim
24 words
The method of claim 6 in which the protuberances on the heated member form small craters in the planar surface of the thermoplastic sheet.
Claim 10
Dependent Claim
55 words
The method of claim 6 in which the thermoplastic material is polyethylene, the heated member is at a temperature in the range of 400° F. to 425° F., and said heated member is pressed onto the planar surface for about 0.016 seconds at a pressure of about 435 pounds per square inch of said surface.
Claim 11
Dependent Claim
26 words
The method of claim 8 in which the heated member rolls in contact with the planar surface at a rate of about 29 feet per minute.
Claim 12
Dependent Claim
25 words
The method of claim 9 in which the protuberances on the heated member form small craters in the surface of the sheet of thermoplastic material.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |