US3804571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making, flattening and hauling off blown tubular plastics film
Assignee: Windmoeller and Hoelscher KG
•
Filing: 1971-08-17
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Granted: 1974-04-16
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Expires: 1991-08-17
Abstract
Abstract An apparatus for making, flattening and hauling off blown tubular plastics film is disclosed which comprises an extruder for producing the film, a vertically upwardly operative blowhead for inflating the film with air, first means for provisionally flattening the film provided vertically above the blowhead downstream of a position at which the film has solidified. Direction changing means including two direction changing rolls are arranged for diverting the film through 180*. The direction changing rolls are grooved to permit the passage of inflating air from the blowhead to the squeeze rolls. Supporting means are provided between the two direction changing rolls for limiting inflation of the film. Second means for flattening the film, including squeeze rolls, are disposed at a spacing from and vertically below the downstream end of the direction changing means.
Inventors
- 👤 H Upmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/10; B29C48/901; B29C48/903; B29C48/001; B29C48/0018; B29C48/0019; B29C48/885; B29C48/911; B29C48/9115; B29C48/912; B29C48/9135
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
An apparatus for making, flattening and hauling off blown tubular plastics film comprising an extruder for extruding said film; a blowhead for inflating said film with air in a vertically and upwardly oriented direction, first means positioned vertically above said blowhead and downstream of a position at which said film is solidified for flattening said film, direction changing means including two direction changing rolls for diverting said film through 180*, second means spaced from and positioned vertically below the downstream end of said direction changing means for flattening said film, said second means including squeeze rolls, said direction changing rolls being grooved to permit the passage of inflating air from said blowhead to said squeeze rolls such that said film is inflated with air between said two direction changing rolls and between said direction changing means and said second means, a supporting means arranged between said two direction changing rolls for limiting the inflation of said film; another supporting means positioned upstream of each of said first and second means comprising ring segments surrounding said film and further comprising means for radially adjusting said ring segments for adapting said supporting means to different film diameters, and means for radially adjusting said ring segments in unison.
Claim 2
Independent Claim
205 words
An apparatus for making, flattening and hauling off blown tubular plastics film comprising an extruder for extruding said film; a blowhead for inflating said film with air in a vertically and upwardly oriented direction, first means positioned vertically above said blowhead and downstream of a position at which said film is solidified for flattening said film, direction changing means including two direction changing rolls for diverting said film through 180*, second means spaced from and positioned vertically below the downstream end of said direction changing means for flattening said film, said second means including squeeze rolls, said direction changing rolls being grooved to permit the passage of inflating air from said blowhead to said squeeze rolls such that said film is inflated with air between said two direction changing rolls and between said direction changing means and said second means, a supporting means arranged between said two direction changing rolls for limiting the inflation of said film; another supporting means positioned upstream of each of said first and second means comprising ring segments surrounding said film and further comprising means for radially adjusting said ring segments for adapting said supporting means to different film diameters, and means for radially adjusting said ring segments in unison.
Claim 3
Dependent Claim
69 words
The apparatus of claim 1 in which said segment means is mounted for oscillatory rotary motion and further comprising stationary haul off and coiling means for said film downstream of said second means at substantially the same level as said extruder and further comprising a turning bar system mounted for oscillatory rotary motion, said haul off and coiling means adapted to receive said film from said turning bar system.
Claim 4
Dependent Claim
61 words
The apparatus of claim 2 in which said stationary haul off and coiling means comprises a pair of stationary haul off rolls located downstream of said turning bar system and in which said squeeze rolls are located upstream of said turning bar system, one of said haul off rolls being in contact with said coiling means for driving said coiling means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |