US3850716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame sealing method
Assignee: RPR IND Inc
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Filing: 1973-12-20
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Granted: 1974-11-26
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Expires: 1993-12-20
Abstract
Abstract An apparatus and method for flame sealing heat-sealable sheet material, as polyester film. The sheet material is center-folded and moves under substantially constant tension in an elongated path. During movement of the folded sheet material in the elongated path, a knife trimmer cuts linear aligned edges on superimposed portions of the sheet material. The aligned edges are flame sealed with an elongated flame unit. A linear portion of the sheet material adjacent and substantially parallel to the edges being heat sealed is cooled to confine the heat to the edges. The heat sealed edges are then cooled in an elongated chamber. A pair of puller rollers act on the sheet material to continuously move the sheet material under tension in the elongated path.
Inventors
- 👤 R Podvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:25
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/106; B29C66/00; B29C66/01; B29C66/03; B29C66/034; B29C66/0342; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/137; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/80; B29C66/81; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/836; B29C2793/00; B29C2793/0081; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1052; Y10T156/1062; Y10T156/1066
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
158 words
A method of sealing together adjacent longitudinal portions of heat-sealable sheet material comprising: continuously moving the sheet material and longitudinal portions thereof in an elongated path determined by the longitudinal length of the sheet material, subjecting the sheet material to substantially constant tension along the longitudinal length of the sheet material as the sheet material continuously moves in the elongated path, forming linear aligned longitudinal edges along adjacent longitudinal portions of the sheet material as the sheet material moves along the elongated path, said longitudinal edges being extended along the elongated path of movement of the sheet material, applying an elongated flame to a substantial length of said linear edges to longitudinally seal during movement of said sheet material along the elongated path, said flame being extended along the elongated path of movement of the sheet material, cooling a linear longitudinal portion of said linear seal as the seal moves away from said flame in said elongated path.
Claim 2
Independent Claim
158 words
A method of sealing together adjacent longitudinal portions of heat-sealable sheet material comprising: continuously moving the sheet material and longitudinal portions thereof in an elongated path determined by the longitudinal length of the sheet material, subjecting the sheet material to substantially constant tension along the longitudinal length of the sheet material as the sheet material continuously moves in the elongated path, forming linear aligned longitudinal edges along adjacent longitudinal portions of the sheet material as the sheet material moves along the elongated path, said longitudinal edges being extended along the elongated path of movement of the sheet material, applying an elongated flame to a substantial length of said linear edges to longitudinally seal during movement of said sheet material along the elongated path, said flame being extended along the elongated path of movement of the sheet material, cooling a linear longitudinal portion of said linear seal as the seal moves away from said flame in said elongated path.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein: said sheet material is pulled in said elongated path.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein: the linear edges are joined by mechanical force during the formation thereof.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein: the elongated flame provides a substantially constant source of heat along a substantial linear longitudinal length of said linear aligned edges.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein: an elongated longitudinal portion of the sheet material longer than the elongated flame is cooled adjacent the linear aligned edges that are being heat sealed together.
Claim 7
Dependent Claim
32 words
The method of claim 1 including: longitudinally folding the sheet material to place opposite portions thereof in side-by-side relation to each other, said folded sheet material being moved in the elongated path.
Claim 8
Dependent Claim
31 words
The method of claim 6 wherein: the opposite portions of the folded sheet material are subjected to substantially the same pulling forces to move the sheet material in the elongated path.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein: the linear aligned edges are formed by linearly cutting the adjacent portions of the sheet material.
Claim 10
Dependent Claim
23 words
The method of claim 1 wherein: the linear aligned edges are formed by linearly compressing and cutting adjacent portions of the sheet material.
Claim 11
Dependent Claim
52 words
The method of claim 1 wherein: the sheet material is subjected to a substantially constant tension by braking movement of the sheet material adjacent the beginning of the elongated path and pulling the sheet material adjacent the end of the elongated path to overcome the braking force acting on the sheet material.
Claim 12
Independent Claim
139 words
A method of sealing together adjacent longitudinal edge portions of superimposed layers of heat-sealable sheet material comprising: continuously moving the sheet material and adjacent longitudinal edge portions thereof in an elongated path determined by the longitudinal length of the sheet material, subjecting the sheet material to substantially constant tension along the longitudinal length of the sheet material as the sheet material continuously moves in the elongated path, applying an elongated flame extended in the direction of movement of the sheet material to a substantial length of the longitudinal edge portions to longitudinally heat seal said edge portions together to form a linear longitudinal seal during movement of said sheet material and edge portions along the elongated path, and cooling a linear portion of said sheet material adjacent said longitudinal edge portions being heat sealed together by said elongated flame.
Claim 13
Independent Claim
139 words
A method of sealing together adjacent longitudinal edge portions of superimposed layers of heat-sealable sheet material comprising: continuously moving the sheet material and adjacent longitudinal edge portions thereof in an elongated path determined by the longitudinal length of the sheet material, subjecting the sheet material to substantially constant tension along the longitudinal length of the sheet material as the sheet material continuously moves in the elongated path, applying an elongated flame extended in the direction of movement of the sheet material to a substantial length of the longitudinal edge portions to longitudinally heat seal said edge portions together to form a linear longitudinal seal during movement of said sheet material and edge portions along the elongated path, and cooling a linear portion of said sheet material adjacent said longitudinal edge portions being heat sealed together by said elongated flame.
Claim 14
Dependent Claim
15 words
The method of claim 11 wherein: said sheet material is pulled in said elongated path.
Claim 15
Dependent Claim
24 words
The method of claim 11 including: forming linear longitudinal edges on the edge portions by mechanical means before the application of the flame thereto.
Claim 16
Dependent Claim
27 words
The method of claim 11 wherein: the elongated Flame provides a substantially constant source of heat along a substantial linear longitudinal length of said linear aligned edges.
Claim 17
Dependent Claim
34 words
The method of claim 11 wherein: an elongated longitudinal portion of the sheet material which is longer than the elongated flame is cooled adjacent the linear aligned edges that are being heat sealed together.
Claim 18
Dependent Claim
27 words
The method of claim 11 including: cooling a linear longitudinal portion of said linear seal as the seal moves away from said flame in said elongated path.
Claim 19
Dependent Claim
32 words
The method of claim 11 wherein: opposite portions of the superimposed layers of sheet material are subjected to substantially the same pulling forces to move the sheet material in the elongated path.
Claim 20
Dependent Claim
28 words
The method of claim 11 wherein: linear aligned edges are formed on the longitudinal edge portions by linearly cutting the sheet material before the application of flame thereto.
Claim 21
Dependent Claim
30 words
The method of claim 11 wherein: linear aligned edges are formed on the longitudinal edge portions by linearly compressing and cutting the sheet material before the application of flame thereto.
Claim 22
Dependent Claim
52 words
The method of claim 11 wherein: the sheet material is subjected to a substantially constant tension by braking movement of the sheet material adjacent the beginning of the elongated path and pulling the sheet material adjacent the end of the elongated path to overcome the braking force acting on the sheet material.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |