US4259134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer film slitter-sealer apparatus and method
Assignee: Bank One Corp
•
Filing: 1979-04-12
•
Granted: 1981-03-31
•
Expires: 1999-04-12
Abstract
Abstract Slitter-sealer, for slitting two layers of thermoplastic polymer film and sealing the slit edges of adjacent layers together, has a preheater for preheating the polymer film before slitting to reduce the required temperature at the slitter and improve sealing.
Inventors
- 👤 Richard L. Joice
- 👤 Joseph C. Adamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:37
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/137; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/226; B29C65/228; B29C65/74; B29C65/743; B29C65/7433; B29C65/7439; B29C66/02; B29C66/024; B29C66/0242; B29C66/11; B29C66/112; B29C66/1122; B29C66/133; B29C66/347; B29C66/3472; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/432; B29C66/4322; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/816; B29C66/8167; B29C66/83; B29C66/836; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/9161; B29C66/91651; B29C66/91655; B29C66/91423; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A polymer film slitter-sealer apparatus comprising: first means for advancing along a sealing line a plurality of layers of thermoplastic synthetic polymer film material lying next to each other; second means for preheating, slitting and sealing the polymer film along the sealing line as it advances past a preheating, slitting and sealing station; and third means for heting said second means; said second means comprising a heater bar having an integral preheater portion and an integral slitter-sealer portion positioned along the sealing line at a position the polymer film reaches after it passes said preheater portion.
Claim 2
Dependent Claim
96 words
A polymer film slitter-sealer apparatus comprising: first means for advancing along a sealing line a plurality of layers of thermoplastic synthetic polymer film material lying next to each other; second means for preheating, slitting and sealing the polymer film along the sealing line as it advances past a preheating, slitting and sealing station; and third means for heting said second means; said second means comprising a heater bar having an integral preheater portion and an integral slitter-sealer portion positioned along the sealing line at a position the polymer film reaches after it passes said preheater portion.
Claim 3
Dependent Claim
39 words
The polymer film slitter-sealer apparatus of claim 1 wherein said preheater portion is spaced from said slitter-sealed portion so that there is a thermal soaking dwell time between polymer film contact with said preheater portion and said slitter-sealer portion.
Claim 4
Dependent Claim
24 words
The polymer film slitter-sealer apparatus of claim 2 wherein said slitter-sealer portion incudes a bifurcated knife and said preheater portion includes a heater pad.
Claim 5
Dependent Claim
38 words
The polymer film slitter-sealer apparatus of claim 1 wherein said third means is electric so that electric current passes through said heater bar to directly resistance-heat bar for heating both said preheater portion and said slitter-sealer portion together.
Claim 6
Dependent Claim
83 words
A unitary preheater-slitter-sealer bar for thermoplastic synthetic polymer film slitter-sealer apparatus comprising: a slitter knife portion for positioning along the path of motion of a plurality of layers of thermoplastic polymer film as the film moves along a line upon which slitting and sealing is to take place; and a preheater portion positioned to be in conductive thermal contact with the polymer film layer along the line at a position where preheating of the film is accomplished before film slitting by said knife.
Claim 7
Dependent Claim
83 words
A unitary preheater-slitter-sealer bar for thermoplastic synthetic polymer film slitter-sealer apparatus comprising: a slitter knife portion for positioning along the path of motion of a plurality of layers of thermoplastic polymer film as the film moves along a line upon which slitting and sealing is to take place; and a preheater portion positioned to be in conductive thermal contact with the polymer film layer along the line at a position where preheating of the film is accomplished before film slitting by said knife.
Claim 8
Dependent Claim
37 words
The bar of claim 5 wherein said slitter knife portion is a bifurcated knife, said preheater portion is a heater pad, and said heater bar is heated by electric resistance heating by electric conduction through said bar.
Claim 9
Dependent Claim
41 words
The heater bar of claim 6 wherein said heater pad is spaced from said knife along the line so that there is thermal soaking dwell time between polymer film contact with said heater pad and polymer film slitting by said knife.
Claim 10
Independent Claim
93 words
The method of slitting and sealing of juxtaposed plural layers of thermoplastic polymer film comprising the steps of: advancing a plurality of juxtaposed layers of thermoplastic synthetic polymer film to be slit and sealed along a slit-seal line; disposing a heater bar having a preheater portion and a slitter-sealer portion on the line; and heating the heater bar so that the preheater portion and the slitter-sealer portion are heated simultaneously and commonly so that the thermoplastic polymer film is preheated and subsequently slit-sealed on the line as it is advanced along the line.
Claim 11
Independent Claim
93 words
The method of slitting and sealing of juxtaposed plural layers of thermoplastic polymer film comprising the steps of: advancing a plurality of juxtaposed layers of thermoplastic synthetic polymer film to be slit and sealed along a slit-seal line; disposing a heater bar having a preheater portion and a slitter-sealer portion on the line; and heating the heater bar so that the preheater portion and the slitter-sealer portion are heated simultaneously and commonly so that the thermoplastic polymer film is preheated and subsequently slit-sealed on the line as it is advanced along the line.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein said heating step comprises passing an electric current through said heater bar for electric resistance heating thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |