US3840384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for coating plastics film
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-03-03
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Granted: 1974-10-08
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Expires: 1992-03-03
Abstract
Abstract A method and device for coating plastic films in which the thickness of the coating is controlled by passing the coated film under steady pressure past a resilient scraping member in whose surface are embedded solid particles which space the film from the surface of the resilient member.
Inventors
- 👤 G Reade
- 👤 A Viney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/40; B05D1/42; B05C; B05C11/00; B05C11/02; B05C11/021; B05C3/00; B05C3/02; B05C3/12; B05D1/26; B05D7/00; B05D7/02; B05D2201/00; B05D2254/00; B05D2254/02; Y; Y10; Y10S; Y10S118/00; Y10S118/11
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
118 words
A METHOD OF COATING THE ENTIRE SURFACE OF A PLASTIC FILM WITH A FLOWABLE POLYMERIC COATING MATERIAL COMPRISING APPLYING THE FLOWABLE POLYMERIC COATING MATERIAL TO THE FILM SURFACE, REGULATING THE THICKNESS OF THE APPLIED POLYMERIC COATING MATERIAL TO PROVIDE A UNIFORM COATING LAYER ON THE FILM SURFACE BY PASSING THE FILM WITH THE POLYMERIC COATING MATERIAL THEREON PAST A RESILIENT SCRAPING MEMBER A SURFACE OF WHICH IS BIASED TOWARDS THE FILM SURFACE UNDER A SUBSTANTIALLY CONSTANT PRESSURE, THE SAID SURFACE OF THE SCRAPING MEMBER HAVING A PARTICULATE MATERIAL EMBEDDED THEREIN AND EVENLY DISTRIBUTED SO AS TO PROVIDE A FINE CLEARANCE BETWEEN SAID SURFACE AND THE SURFACE OF THE PLASTIC FILM, AND THEREAFTER DRYING THE APPLIED POLYMERIC COATING MATERIAL.
Claim 2
Independent Claim
118 words
A METHOD OF COATING THE ENTIRE SURFACE OF A PLASTIC FILM WITH A FLOWABLE POLYMERIC COATING MATERIAL COMPRISING APPLYING THE FLOWABLE POLYMERIC COATING MATERIAL TO THE FILM SURFACE, REGULATING THE THICKNESS OF THE APPLIED POLYMERIC COATING MATERIAL TO PROVIDE A UNIFORM COATING LAYER ON THE FILM SURFACE BY PASSING THE FILM WITH THE POLYMERIC COATING MATERIAL THEREON PAST A RESILIENT SCRAPING MEMBER A SURFACE OF WHICH IS BIASED TOWARDS THE FILM SURFACE UNDER A SUBSTANTIALLY CONSTANT PRESSURE, THE SAID SURFACE OF THE SCRAPING MEMBER HAVING A PARTICULATE MATERIAL EMBEDDED THEREIN AND EVENLY DISTRIBUTED SO AS TO PROVIDE A FINE CLEARANCE BETWEEN SAID SURFACE AND THE SURFACE OF THE PLASTIC FILM, AND THEREAFTER DRYING THE APPLIED POLYMERIC COATING MATERIAL.
Claim 3
Dependent Claim
31 words
A method according to claim 1 wherein the plastic film is tubular, and including passing a tubular plastic film of substantially cylindrical configuration through an annular scraping member of appropriate perimeter.
Claim 4
Dependent Claim
34 words
A method according to claim 2 further comprising passing the tubular plastic film through a vessel containing the polymeric coating material and through an annular scraping member which forms a seal in the vessel.
Claim 5
Dependent Claim
19 words
A method according to claim 3 further comprising maintaining a steady pressure of polymeric coating material in the vessel.
Claim 6
Dependent Claim
17 words
A method according to claim 1 in which the polymeric coating material is a latex or solution.
Claim 7
Dependent Claim
17 words
A method according to claim 1 in which the coated film is heated to dry the coating.
Claim 8
Dependent Claim
16 words
A method according to claim 1 in which the coated film is subsequently oriented by stretching.
Claim 9
Independent Claim
70 words
A device for coating a surface of a plastic film comprising a resilient scraping member, means for drawing a plastic film past the scraping member and in contact therewith under a substantially constant pressure, and means for applying a flowable polymeric coating material to the film surface in advance of the scraping member, the resilient scraping member having a particulate material evenly distributed upon and embedded in its film-contacting surface.
Claim 10
Independent Claim
70 words
A device for coating a surface of a plastic film comprising a resilient scraping member, means for drawing a plastic film past the scraping member and in contact therewith under a substantially constant pressure, and means for applying a flowable polymeric coating material to the film surface in advance of the scraping member, the resilient scraping member having a particulate material evenly distributed upon and embedded in its film-contacting surface.
Claim 11
Dependent Claim
34 words
A device according to claim 8 wherein the plastic film to be coated is tubular and wherein the scraping member is annularly configured to receive the coated tubular film and pass the film therethrough.
Claim 12
Dependent Claim
21 words
A device according to claim 9 in which the annular member forms a seal in a vessel for containing coating material.
Claim 13
Dependent Claim
20 words
A device according to claim 10 comprising further means for maintaining a steady pressure of coating material in the vessel.
Claim 14
Dependent Claim
16 words
A device according to claim 8 in which the scraping member is formed from silicone rubber.
Claim 15
Dependent Claim
15 words
A device according to claim 8 in which the particulate material is an abrasive material.
Claim 16
Dependent Claim
14 words
A device according to claim 13 in which the abrasive material is carborundum powder.
Claim 17
Dependent Claim
19 words
A device according to claim 8 in which the average particle size of the particulate material is 140 microns.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |