US3616042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag-making apparatus and method
Assignee: Dow Chemical Co
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Filing: 1968-05-29
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Granted: 1971-10-26
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Expires: 1988-05-29
Abstract
Abstract Apparatus and method for forming bags from flattened tubular or longitudinally folded web stock wherein the stock can include opposed beadlike closure members located on the inner surface thereof. The flattened stock is initially sandwiched between two layers of release material, and then directed to between cooperating sealing elements, one of which is heated. The sealing elements laterally seal the stock at regularly spaced intervals to form a plurality of connected compartments or bags. Assisting the sealing elements is a stomperlike member which flattens the closure members in the region of each seal, thereby rendering the seal at the closure substantially liquid and gastight. Thereafter, the release is removed from each side of the sealed stock, and the stock parted into individual bags.
Inventors
- 👤 Carlton E Beyer
- 👤 Raymond D Behr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:51
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/83; B29C66/834; B29C66/8351; B29C66/83511; B29C65/00; B29C65/02; B29C65/18; B29C65/78; B29C65/7858; B29C65/7879; B29C65/7882; B29C65/7885; B29C65/7888; B29C65/7894; B29C66/004; B29C66/0042; B29C66/0044; B29C66/00441; B29C66/01; B29C66/03; B29C66/034; B29C66/0342; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/346; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/432; B29C66/4322; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/81; B29C66/812; B29C66/8122; B29C66/814; B29C66/8145; B29C66/81457; B29C66/82; B29C66/822; B29C66/8221; B29C66/824; B29C66/8242; B29C66/832; B29C66/8322; B29C66/84; B29C66/851; B29C66/8511; B29C66/71; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1317
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
The method of claim 1 wherein at least one of said panels includes a thickened profile located in said sealed strip area, said heat applying step comprising applying sufficient heat to heat plastify the material comprising the portion of said profile in the region of said strip, and including the additional step of applying pressure externally to one of said layers to locally flatten the heat plasticized portion of said profile, said pressure being sufficient to obtain a substantially airtight adherence between said panels in the area of said strip comprising the profile.
Claim 2
Dependent Claim
23 words
The method of claim 2 wherein said heat applying step comprises applying said heat substantially uniformly across the entire area comprising said strip.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said supporting layers comprise release material.
Claim 4
Dependent Claim
245 words
Apparatus for sealing together continuous panels of synthetic resinous material placed in face to face contiguous relationship, said apparatus comprising a first continuous layer of release material, a second continuous layer of release material disposed in superposed relationship with said first layer of material, means to continuously move said first and second layers of matErial forward as a unit, a first region where said layers are continuously brought together, a second region where said layers are continuously separated from each other, said second region being located downwardly of said first region with respect to the direction and travel of said layers, said layers at said first region being adapted to continuously receive said panels therebetween and carry said panels forward to said second region, first and second sealing elements disposed opposite each other with said layers being disposed between the sealing elements, means to move said sealing elements at a rate uniform with the movement of said layers and at least partially over the distance between said first and second regions, means to reversibly move at least one of said sealing elements generally transversely with respect to the direction of movement of said layers so that said sealing elements can be moved together and apart engaging a strip of said layers therebetween in the closed position, and means to transmit heat through at least one of said sealing elements in the closed position to cause said panels to adhere to each other along said strip.
Claim 5
Dependent Claim
53 words
The apparatus of claim 5 including means to disengage said sealing elements at a vicinity remote from said second region said apparatus including a cooling zone located between said second region and the vicinity said sealing elements disengage, whereby said panels can cool while being firmly supported between said first and second layers.
Claim 6
Dependent Claim
53 words
The apparatus of claim 6 wherein at least once of said panels includes a thickened profile, said heating means being sufficient to heat plastify the portion of said profile located in the region of said strip, said apparatus including means to locally flatten said profile in the area thereof contiguous with said strip.
Claim 7
Dependent Claim
41 words
The apparatus of claim 7 wherein said flattening means operates in said cooling zone, said apparatus including means to move said flattening means at a rate uniform with said layers while a flattening means is applying pressure locally to said profile.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |