Patent US2271780A successfully refreshed from Google Patents.
US4263252A
Expired / Lapsed
US
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Method for producing an oriented tubular film
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-04-25
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Granted: 1981-04-21
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Expires: 1999-04-25
Abstract
Abstract A method for coating an axially moving tubular form by depositing a coating medium on a surface of the form, and spreading the deposited medium around at least part of the surface in a direction transverse to the movement of the form. The technique is suitable for the deposition of a uniform coating of a flowable medium on to a tubular film-forming substrate-particularly in the production of antistatic polyolefin films.
Inventors
- 👤 Brian N. Hendy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:59
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28; B05; B05D; B05D1/00; B05D1/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A method of producing an oriented, coated tubular film utilizing a belt having a resilient contact layer, comprising the steps of: extruding a tube of thermoplastic polymeric film-forming material; cooling the extruded tube; withdrawing and axially forwarding the cooled tube; supplying a liquid coating medium to the external surface of said withdrawn tube; spreading the supplied coating medium around at least part of said surface by driving, in a plane substantially normal to the longitudinal axis of said tube, the belt with its resilient contact layer co-operating with said external surface; and reheating and inflating the coated tube to form an oriented coated tubular film.
Claim 2
Independent Claim
105 words
A method of producing an oriented, coated tubular film utilizing a belt having a resilient contact layer, comprising the steps of: extruding a tube of thermoplastic polymeric film-forming material; cooling the extruded tube; withdrawing and axially forwarding the cooled tube; supplying a liquid coating medium to the external surface of said withdrawn tube; spreading the supplied coating medium around at least part of said surface by driving, in a plane substantially normal to the longitudinal axis of said tube, the belt with its resilient contact layer co-operating with said external surface; and reheating and inflating the coated tube to form an oriented coated tubular film.
Claim 3
Dependent Claim
72 words
A method according to claim 1 utilizing a plurality of endless belts axially spaced apart and circumferentially disposed relative to each other about said tube, and wherein said step of spreading coating medium is accomplished by driving each of the belts in a plane substantially normal to the longitudinal axis of the tube so that together the belts spread the supplied coating medium around the entire external peripheral surface of the tube.
Claim 4
Dependent Claim
34 words
A method as recited in claim 1 wherein said supplying step is practiced by supplying the coating medium to the contact layer of the belt for transfer to the external surface of said tube.
Claim 5
Independent Claim
19 words
A method as recited in claims 1 or 2 wherein the coating medium includes at least one antistatic additive.
Claim 6
Independent Claim
19 words
A method as recited in claims 1 or 2 wherein all the method steps are practiced continuously and sequentially.
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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 |