US4680073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for heat sealing
Assignee: Reynolds Metals Co
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Filing: 1986-03-17
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Granted: 1987-07-14
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Expires: 2006-03-17
Abstract
Abstract A method and apparatus for heat sealing are disclosed. A fin seal is formed along the edge of the film, with the seal being trimmed immediately after being formed, and while still warm and in registry.
Inventors
- 👤 Hans A. Brunner
- 👤 Donald E. Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/74; B29C65/745; B29C65/7459; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/133; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/80; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/84; B29C66/849; B29C66/70; B29C66/71; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/108; Y10T156/1084; Y10T156/1087; Y10T156/12; Y10T156/1317
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A method for forming a fin seal along an edge of a plastics resin film comprising passing an end of said film between a pair of guide rollers, passing said end between a heated, driven band sealing surface and a backup surface to form a sealed region within said end, and subsequently driving said end and cutting excess material from said end, including a portion of said sealed region, to thereby form said edge by passing said end between a rotating drive wheel having a cutting knife therein and a rotating backup wheel, said drive wheel and said backup wheel being sufficiently close to said band such that said end remains in registry during sealing and cutting and said sealed region is cut while at an elevated temperature.
Claim 2
Independent Claim
128 words
A method for forming a fin seal along an edge of a plastics resin film comprising passing an end of said film between a pair of guide rollers, passing said end between a heated, driven band sealing surface and a backup surface to form a sealed region within said end, and subsequently driving said end and cutting excess material from said end, including a portion of said sealed region, to thereby form said edge by passing said end between a rotating drive wheel having a cutting knife therein and a rotating backup wheel, said drive wheel and said backup wheel being sufficiently close to said band such that said end remains in registry during sealing and cutting and said sealed region is cut while at an elevated temperature.
Claim 3
Dependent Claim
11 words
The method of claim 1 further comprising collecting said excess material.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein said collecting is accomplished by means of a vacuum.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said plastics resin film is a polyvinyl chloride film.
Claim 6
Dependent Claim
145 words
Apparatus for forming a fin seal along an edge of a plastics resin film comprising a pair of guide rollers, a band, means for driving said band, means for heating said band, a backup surface against which an end portion of said film is held to form a sealed region within said end by said band, and a means for subsequently driving said end and cutting excess material from said end, including a portion of said sealed region, to thereby form said edge comprising a rotating drive wheel having a cutting knife therein, a rotating backup wheel and a means for driving said drive wheel and said backup wheel, said drive wheel and said backup wheel being positioned sufficiently close to said band such that said end remains in registry during sealing and cutting and said sealed region is cut while at an elevated temperature.
Claim 7
Dependent Claim
145 words
Apparatus for forming a fin seal along an edge of a plastics resin film comprising a pair of guide rollers, a band, means for driving said band, means for heating said band, a backup surface against which an end portion of said film is held to form a sealed region within said end by said band, and a means for subsequently driving said end and cutting excess material from said end, including a portion of said sealed region, to thereby form said edge comprising a rotating drive wheel having a cutting knife therein, a rotating backup wheel and a means for driving said drive wheel and said backup wheel, said drive wheel and said backup wheel being positioned sufficiently close to said band such that said end remains in registry during sealing and cutting and said sealed region is cut while at an elevated temperature.
Claim 8
Dependent Claim
13 words
The apparatus of claim 5 further comprising means for collecting said excess material.
Claim 9
Dependent Claim
12 words
The apparatus of claim 6 wherein said collecting means comprises vacuum means.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |