US4174244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a printing blanket
Assignee: Industrial Electronic Rubber Co
•
Filing: 1977-08-01
•
Granted: 1979-11-13
•
Expires: 1997-08-01
Abstract
Abstract The present invention provides an improvement in the manufacture of laminates containing a rubber surface and particularly to a method of preparing printing blankets for the printing industry wherein the top or printing layer comprises a substantially void-free fluoroelastomer. The improved method of preparing the printing blankets of the invention comprises preparing a composite of a fibrous or pressure sensitive adhesive backing material; a layer of a foamable and cross-linkable elastomeric material over the backing material; a second fibrous material over the layer of foamable material; a top layer of a non-foamable cross-linkable elastomeric material over said second layer of fibrous material; and molding the composite at an elevated temperature under pressure. The improved process of the present invention provides a compressible printing blanket having a top layer surface which not only is substantially void free but also is substantially free of surface irregularities.
Inventors
- 👤 Eric W. Thomas
- 👤 Thomas J. Maistros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:26
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B41; B41N; B41N10/00; B41N10/02; B41N10/04; D; D06; D06N; D06N3/00; D06N3/04; D06N3/047; D06N3/10; D06N3/106; B41N2210/00; B41N2210/02; B41N2210/04; B41N2210/14; D06N2205/00; D06N2205/04; D06N2205/20; D06N2209/00; D06N2209/16; D06N2209/1657; D06N2209/1678; Y; Y10; Y10S; Y10S428/00; Y10S428/909; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/335
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
A process for preparing a printing blanket useful for offset printing which comprises (a) preparing a composite by (1) sheeting out a layer of a foamable and cross-linkable elastomeric material over a fibrous or pressure sensitive adhesive backing material, (2) applying an intermediate layer of fibrous material over a layer of foamable material, and (3) sheeting out a top layer of a non-foamable cross-linkable elastomeric material over said intermediate layer of fibrous material, and (b) molding the composite at an elevated temperature under pressure whereby both layers of elastomeric material are cross-linked in situ and the foamable elastomeric material is foamed in situ.
Claim 2
Dependent Claim
103 words
A process for preparing a printing blanket useful for offset printing which comprises (a) preparing a composite by (1) sheeting out a layer of a foamable and cross-linkable elastomeric material over a fibrous or pressure sensitive adhesive backing material, (2) applying an intermediate layer of fibrous material over a layer of foamable material, and (3) sheeting out a top layer of a non-foamable cross-linkable elastomeric material over said intermediate layer of fibrous material, and (b) molding the composite at an elevated temperature under pressure whereby both layers of elastomeric material are cross-linked in situ and the foamable elastomeric material is foamed in situ.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the fibrous backing material is a woven or non-woven fabric.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein the composite is molded at a temperature between about 125° to about 225° C. for a period of from about one to about 20 minutes.
Claim 5
Dependent Claim
24 words
The processs of claim 3 wherein the composite is molded between steel plates at a pressure of between about one to about 500 psi.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the elastomeric material of the top layer is a fluoroelastomer.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the foamable elastomeric material is a fluoroelastomer.
Claim 8
Dependent Claim
11 words
The process of claim 5 wherein the fluoroelastomer is a fluorocarbon.
Claim 9
Dependent Claim
20 words
The process of claim 5 wherein the fluoroelastomer is a polymer containing a major portion of hexafluoropropylene and vinylidene fluoride.
Claim 10
Dependent Claim
125 words
A process for preparing a compressible printing blanket for offset printing which comprises (a) preparing a composite by (1) sheeting out a layer of a foamable and cross-linkable fluoroelastomeric material over a fibrous backing material, (2) applying an intermediate layer of fibrous material over the layer of foamable elastomeric material, and (3) sheeting out a top layer of non-foaming cross-linkable fluoroelastomeric material over said intermediate layer of fibrous material, and (b) molding the composite under a pressure of from one to about 500 psi at a temperature of from about 150° C. to about 200° C. for a period of from about one to 20 minutes whereby both layers of elastomeric material are cross-linked in situ and the foamable elastomeric material is foamed in situ.
Claim 11
Dependent Claim
125 words
A process for preparing a compressible printing blanket for offset printing which comprises (a) preparing a composite by (1) sheeting out a layer of a foamable and cross-linkable fluoroelastomeric material over a fibrous backing material, (2) applying an intermediate layer of fibrous material over the layer of foamable elastomeric material, and (3) sheeting out a top layer of non-foaming cross-linkable fluoroelastomeric material over said intermediate layer of fibrous material, and (b) molding the composite under a pressure of from one to about 500 psi at a temperature of from about 150° C. to about 200° C. for a period of from about one to 20 minutes whereby both layers of elastomeric material are cross-linked in situ and the foamable elastomeric material is foamed in situ.
Claim 12
Dependent Claim
31 words
The process of claim 9 wherein the fluoroelastomer in the top layer is a copolymer of hexafluoropropylene and vinylidene fluoride and is from about five to about 30 mils in thickness.
Claim 13
Dependent Claim
16 words
The process of claim 9 wherein the fluoroelastomer in the top layer is a fluorocarbon polymer.
Claim 14
Dependent Claim
20 words
The process of claim 11 wherein the foamable and cross-linkable fluoroelastomeric material is a copolymer of hexafluoropropylene and vinylidene fluoride.
References Cited (Backward Citations)
CA636007A
Cited
US1398147A
Cited
US2792321A
Cited
US3143457A
Cited
US3186894A
Cited
US3235772A
Cited
US3519527A
Cited
US3700541A
Cited
DE2025547A1
Cited
US3795568A
Cited
US3881045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |