US3717538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming articles of thermoplastic film material
Assignee: Joisten & Kettenbaum Elektro M
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Filing: 1970-12-31
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Granted: 1973-02-20
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Expires: 1990-12-31
Abstract
Abstract There is disclosed an apparatus for forming articles of a thermoplastic film material, in particular of tubular film material, including an endless circulating conveying belt carrying and conveying said film material drawn from a storage roll, a welding die vertically movable above the belt and including an electrically heated welding band having a projecting edge producing a severed and welded seam upon being moved upon the film material, and a counter engaging platen arranged in the vicinity of said die below the conveying belt for supporting same. The apparatus is characterized by a depressor arranged within the projecting edge of the welding die, the depressor having an engaging plate provided with bores and a cavity disposed thereover and selectively capable of being connected to a vacuum or compressed air line.
Inventors
- 👤 G Hartung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:10
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/06; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/224; B29C65/74; B29C65/743; B29C65/7441; B29C65/78; B29C65/7841; B29C65/7847; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7888; B29C65/7891; B29C65/7897; B29C66/00; B29C66/003; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/24; B29C66/244; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/83; B29C66/832; B29C66/8322; A; A41; A41D; A41D19/00; A41D19/04; B29C65/749; B29C66/816; B29C66/8161; B29L; B29L2031/00; B29L2031/48; B29L2031/4842; B29L2031/4864; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313; Y10T156/1348; Y10T83/00; Y10T83/04; Y10T83/0448; Y10T83/0476; Y10T83/202; Y10T83/2033; Y10T83/2037; Y10T83/2092; Y10T83/2183; Y10T83/2185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
An apparatus for forming articles from multiple layers of thermoplastic material comprising: platen means for supporting layers of thermoplastic material, conveying means for conveying multiple layers of thermoplastic material over said platen means, welding means selectively movable into engagement with the thermoplastic material for pressing the material against said platen means and including heated edge means for producing a severed and welded seam in the multiple layers of the thermoplastic material, and depressor means adjacent to said edge means and connected to said welding means for applying a vacuum to the material being severed and welded to remove same from said platen means as said welding means moves therefrom and for subsequently applying air pressure to the severed and welded material to remove same therefrom.
Claim 2
Independent Claim
125 words
An apparatus for forming articles from multiple layers of thermoplastic material comprising: platen means for supporting layers of thermoplastic material, conveying means for conveying multiple layers of thermoplastic material over said platen means, welding means selectively movable into engagement with the thermoplastic material for pressing the material against said platen means and including heated edge means for producing a severed and welded seam in the multiple layers of the thermoplastic material, and depressor means adjacent to said edge means and connected to said welding means for applying a vacuum to the material being severed and welded to remove same from said platen means as said welding means moves therefrom and for subsequently applying air pressure to the severed and welded material to remove same therefrom.
Claim 3
Independent Claim
125 words
An apparatus for forming articles from multiple layers of thermoplastic material comprising: platen means for supporting layers of thermoplastic material, conveying means for conveying multiple layers of thermoplastic material over said platen means, welding means selectively movable into engagement with the thermoplastic material for pressing the material against said platen means and including heated edge means for producing a severed and welded seam in the multiple layers of the thermoplastic material, and depressor means adjacent to said edge means and connected to said welding means for applying a vacuum to the material being severed and welded to remove same from said platen means as said welding means moves therefrom and for subsequently applying air pressure to the severed and welded material to remove same therefrom.
Claim 4
Independent Claim
125 words
An apparatus for forming articles from multiple layers of thermoplastic material comprising: platen means for supporting layers of thermoplastic material, conveying means for conveying multiple layers of thermoplastic material over said platen means, welding means selectively movable into engagement with the thermoplastic material for pressing the material against said platen means and including heated edge means for producing a severed and welded seam in the multiple layers of the thermoplastic material, and depressor means adjacent to said edge means and connected to said welding means for applying a vacuum to the material being severed and welded to remove same from said platen means as said welding means moves therefrom and for subsequently applying air pressure to the severed and welded material to remove same therefrom.
Claim 5
Dependent Claim
53 words
An apparatus as set forth in claim 1 wherein said depressor means includes a pLate defining the bottom of a cavity in said depressor means and said plate has bores extending therethrough to establish fluid communication with said cavity, and means for selectively supplying said vacuum and said air pressure to said cavity.
Claim 6
Dependent Claim
51 words
An apparatus as set forth in claim 1 wherein said edge means defines the periphery of an article to be formed by severing and welding the layers of the thermoplastic material together, said plate of said depressor means having an edge which is closely spaced to and within said edge means.
Claim 7
Dependent Claim
34 words
An apparatus as set forth in claim 3 wherein said welding means includes a base and said edge means depends from said base, and means for resiliently attaching said depressor means to said base.
Claim 8
Dependent Claim
20 words
An apparatus as set forth in claim 4 wherein said depressor means includes cooling means for cooling said plate thereof.
Claim 9
Dependent Claim
23 words
An apparatus as set forth in claim 5 wherein said cooling means includes a cooling tube disposed about the edge of said plate.
Claim 10
Dependent Claim
94 words
An apparatus as set forth in claim 6 including an article supporting platen spaced horizontally from said platen means, guide means for moving said welding means vertically upwardly from said platen means and horizontally to a position over said article supporting platen and vice versa whereby an article defined by the severed and welded layers of thermoplastic material may be removed from said platen means as a vacuum is applied thereto by said depressor means and deposited upon said article supporting platen as air pressure is applied to the article by said depressor means.
Claim 11
Dependent Claim
20 words
An apparatus as set forth in claim 1 including means for resiliently attaching said depressor means to said welding means.
Claim 12
Dependent Claim
15 words
An apparatus as set forth in claim 1 wherein said depressor means includes cooling means.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |