US4405404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for oxygenating an extruded molten polyethylene film
Assignee: Tetra Pak AB
•
Filing: 1981-12-01
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Granted: 1983-09-20
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Expires: 2001-12-01
Abstract
Abstract In a method of oxygenating an extruded molten polyethylene film before it is pressed onto a carrier web between a pressure roller and a backing roller, ozone is blown onto the web substantially in the direction of web movement in the zone thereof where it enters the nip of the rollers.
Inventors
- 👤 Fritz Blom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B05; B05C; B05C9/00; B05C9/08; B05C9/10; B05D; B05D1/00; B05D1/26; B05D1/265; B32B27/06; B32B27/10; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B38/00; B32B38/0008; B05D2507/00; B05D2507/01; B05D3/00; B05D3/04; B05D3/0433; B05D3/044; B05D3/0446; B32B2310/00; B32B2310/04; B32B2310/0445; B32B2310/0463; B32B2310/0481; B32B2317/00; B32B2317/12; B32B2323/00; B32B2323/04; B32B2367/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
An apparatus for oxygenating an extruded molten polyethylene film before compressing it with a carrier web for joining thereto comprising a pressure roller and a cooling roller forming a backing roller, a wide-slot extrusion nozzle disposed above the nip of the rollers, and an ozone nozzle, characterised in that the ozone nozzle comprises a tube (6) which has blow nozzles (7) arranged in a row, is disposed above the carrier web (3) parallel to the axis of the pressure roller (1), and touches or almost touches the carrier web (3) in the region where it runs onto the pressure roller, the direction of blowing by the nozzles being substantially tangential to the pressure roller (1).
Claim 2
Independent Claim
115 words
An apparatus for oxygenating an extruded molten polyethylene film before compressing it with a carrier web for joining thereto comprising a pressure roller and a cooling roller forming a backing roller, a wide-slot extrusion nozzle disposed above the nip of the rollers, and an ozone nozzle, characterised in that the ozone nozzle comprises a tube (6) which has blow nozzles (7) arranged in a row, is disposed above the carrier web (3) parallel to the axis of the pressure roller (1), and touches or almost touches the carrier web (3) in the region where it runs onto the pressure roller, the direction of blowing by the nozzles being substantially tangential to the pressure roller (1).
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1, characterised in that the tube (6) is provided with one or more blow nozzles in slot form.
References Cited (Backward Citations)
US3075868A
Cited
GB1053173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |