US3891374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for imparting an oblique orientation to tubular film
Assignee: Mitsui Chemicals Inc
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Filing: 1973-03-27
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Granted: 1975-06-24
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Expires: 1993-03-27
Abstract
Abstract An obliquely oriented tubular film is produced by using an apparatus which includes a first zone where a tubular film of a thermoplastic resin is extruded from an annular die and then cooled, a second zone comprising a fixed mandrel, a rotating mandrel and heating means where the tubular film is heated to its orienting temperature and given torsion between the fixed and rotating mandrel which are mounted coaxially thereby to orient the film obliquely, and a third zone comprising a pair of nip rollers which pull out the oriented tubular film while rotating synchronously and concentrically with the rotating mandrel.
Inventors
- 👤 Tomokazu Ninomiya
- 👤 Nobuhiro Hirata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:17
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/88; B29C48/90; B29C48/901; B29C48/902; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/04; B32B7/12; B29C48/001; B29C48/0018; B29C48/0019; B32B2307/00; B32B2307/50; B32B2307/514; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
181 words
An apparatus for producing a tubular film which comprises: an extruder and an annular die for extruding a tubular film of a thermoplastic resin; means located adjacent said die for cooling said film; a fixed mandrel mounted above said die coaxially therewith and including a slit on its peripheral surface for sucking said film to secure it firmly to said fixed mandrel; a rotating mandrel mounted above said fixed mandrel coaxially therewith and including a slit on its peripheral surface for sucking said film to secure it firmly to said rotating mandrel, said rotating mandrel being capable of imparting torsion to said film between it and said fixed mandrel thereby to orient said film obliquely; a heating zone located between sAid fixed mandrel and said rotating mandrel; heating means located exteriorly between said fixed and rotating mandrels for heating the tubular film in said heating zone to its orientation temperature; and a pair of nip rollers mounted above said rotating mandrel for pulling out the oriented film, said nip rollers being capable of rotating synchronously and concentrically with said rotating mandrel.
Claim 2
Independent Claim
181 words
An apparatus for producing a tubular film which comprises: an extruder and an annular die for extruding a tubular film of a thermoplastic resin; means located adjacent said die for cooling said film; a fixed mandrel mounted above said die coaxially therewith and including a slit on its peripheral surface for sucking said film to secure it firmly to said fixed mandrel; a rotating mandrel mounted above said fixed mandrel coaxially therewith and including a slit on its peripheral surface for sucking said film to secure it firmly to said rotating mandrel, said rotating mandrel being capable of imparting torsion to said film between it and said fixed mandrel thereby to orient said film obliquely; a heating zone located between sAid fixed mandrel and said rotating mandrel; heating means located exteriorly between said fixed and rotating mandrels for heating the tubular film in said heating zone to its orientation temperature; and a pair of nip rollers mounted above said rotating mandrel for pulling out the oriented film, said nip rollers being capable of rotating synchronously and concentrically with said rotating mandrel.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein a flex preventing disc and another fixed mandrel is provided between the fixed and rotating mandrels.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |