Patent US540999A successfully refreshed from Google Patents.
Patent US3660205A successfully refreshed from Google Patents.
US3660205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for continuously sealing and severing edges of folded film
Assignee: WR Grace and Co
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Filing: 1970-04-13
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Granted: 1972-05-02
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Expires: 1990-04-13
Abstract
Abstract This invention is a device and a method for continuously sealing and severing two superimposed layers of heat-sealable film while controlling the cooling of the sealed and severed edge to cause strengthening of the seal and reduction of wrinkles in the film adjacent the seal. A preferred device is an inverted U-shaped electrically heated blade partially enclosed by a pair of cooling bars disposed so that the superimposed layers of sealable film pass therebetween in prolonged contact with the heated blade.
Inventors
- 👤 Monroe F Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:38
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/003; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/224; B29C65/226; B29C65/24; B29C65/30; B29C65/74; B29C65/743; B29C65/7439; B29C65/749; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/133; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/73713; B29C66/73715; B29C66/80; B29C66/81; B29C66/818; B29C66/8181; B29C66/81815; B29C66/83; B29C66/836; B29C66/84; B29C66/849; B65; B65B; B65B51/00; B65B51/10; B65B61/00; B65B61/04; B65B61/06; B65B61/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/431; B29C66/4312; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
242 words
An apparatus for continuously severing and sealing together superposed layers of heat-shrinkable, heat-sealable thermoplastic sheet material comprising: a. a sealing and severing tool having a leading, blade-like edge for initially sealing and severing two layers of film material and having a second portion for extended contact with said severed edges, said tool being formed from electrically conductive tubing a portion of which has been flattened to form said blade-like edge; b. means for heating said sealing and severing tool; c. a lower sealing bar, said bar having an opening extending therethrough, said opening closely conforming to the shape and size of said sealing and severing tool, said bar being provided with internal passageways for liquid coolant, and said bar having at least one surface across which and in contact with said film may slidable move; d. an upper cooling bar, said upper bar being adapted to receive the upper portion of said severing and sealing tool, said upper cooling bar being provided with internal passageways for liquid coolant, and said upper sealing bar having at least one surface over which and in contact with thermoplastic film may slidably move; and, e. yieldable, adjustable means to maintain said upper and lower cooling bars in spaced apart relationship whereby as said two layers move through said space between said cooling bars the respective surfaces of the cooling bars will be contacted and the leading edge of said severing and sealing tool will be encountered.
Claim 2
Independent Claim
242 words
An apparatus for continuously severing and sealing together superposed layers of heat-shrinkable, heat-sealable thermoplastic sheet material comprising: a. a sealing and severing tool having a leading, blade-like edge for initially sealing and severing two layers of film material and having a second portion for extended contact with said severed edges, said tool being formed from electrically conductive tubing a portion of which has been flattened to form said blade-like edge; b. means for heating said sealing and severing tool; c. a lower sealing bar, said bar having an opening extending therethrough, said opening closely conforming to the shape and size of said sealing and severing tool, said bar being provided with internal passageways for liquid coolant, and said bar having at least one surface across which and in contact with said film may slidable move; d. an upper cooling bar, said upper bar being adapted to receive the upper portion of said severing and sealing tool, said upper cooling bar being provided with internal passageways for liquid coolant, and said upper sealing bar having at least one surface over which and in contact with thermoplastic film may slidably move; and, e. yieldable, adjustable means to maintain said upper and lower cooling bars in spaced apart relationship whereby as said two layers move through said space between said cooling bars the respective surfaces of the cooling bars will be contacted and the leading edge of said severing and sealing tool will be encountered.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said sealing and severing tool is shaped like an inverted U.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein the means for heating said sealing and severing tool is electrical.
Claim 5
Dependent Claim
43 words
A tool for severing and sealing together superimposed layers of heat-sealable thermoplastic material comprising: a. a tubular member of heat-conductive material; b. a leading blade edge formed by flattening a portion of said tubular member; and c. means for heating said tubular member.
Claim 6
Dependent Claim
43 words
A tool for severing and sealing together superimposed layers of heat-sealable thermoplastic material comprising: a. a tubular member of heat-conductive material; b. a leading blade edge formed by flattening a portion of said tubular member; and c. means for heating said tubular member.
Claim 7
Dependent Claim
11 words
The tool of claim 4 wherein said tubular member is U-shaped.
Claim 8
Dependent Claim
46 words
The tool of claim 5 wherein: the leading blade edge has been formed by flattening said tubular member in one of the arcs of said U-shape; the heat-conductive material is electrically conductive; and the means for heating the tubular member is an electrical current passed therethrough.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |