US3869533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of monoaxially stretched film strips
Assignee: Kalle GmbH and Co KG
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Filing: 1969-07-10
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Granted: 1975-03-04
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Expires: 1989-07-10
Abstract
Abstract This invention relates to a process for the manufacture of monoaxially stretched film strips from a film of a high-polymer thermoplastic synthetic material, in which process the film is longitudinally stretched in at least two stretching zones and is cut into strips between the two zones, the first zone being a relatively short stretching zone in the range of a few millimeters to the film thickness and the second stretching zone being a relatively long stretching zone in the range of the initial width of the film to several meters.
Inventors
- 👤 Siegfried Janocha
- 👤 Walter Seifried
- 👤 Horst Gebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:02
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/426; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0022; B29C55/00; B29C55/02; B29C55/04; B29C55/06; B29C55/065; B29C2793/00; B29C2793/0063; B29C48/03; B29C48/07; B29C48/08; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A PROCESS FOR THE MANUFACTURE OF MONOAXIALLY STRETCHED FILM STRIP FROM A FILM OF A HIGH-POLYMER THERMOSPLASTIC SYNTHETIC MATERIAL WHICH COMPRISES EXTRUDING A MELT OF THE HIGHPOLYMER MATERIAL FROM A FLAT DIE TO FORM A FILM, LONGITUDINALLY STRETCHING THE FILM HEATED TO AN EFFECTIVE STRETCHING TEMPERATURE IN A NARROW GAP IN THE RANGE OF A FEW MILLIMETERS TO THE FILM THICKNESS, CUTTING THE FILM LONGITUDINALLY INTO STRIPS, AND LONGITUDINALLY STRETCHING THE STRIPS HEATED TO AN EFFECTIVE STRETCHING TEMPERATURE IN A WIDE GAP IN THE RANGE OF THE INITIAL WIDTH OF THE FILM TO SEVERAL METERS.
Claim 2
Dependent Claim
95 words
A PROCESS FOR THE MANUFACTURE OF MONOAXIALLY STRETCHED FILM STRIP FROM A FILM OF A HIGH-POLYMER THERMOSPLASTIC SYNTHETIC MATERIAL WHICH COMPRISES EXTRUDING A MELT OF THE HIGHPOLYMER MATERIAL FROM A FLAT DIE TO FORM A FILM, LONGITUDINALLY STRETCHING THE FILM HEATED TO AN EFFECTIVE STRETCHING TEMPERATURE IN A NARROW GAP IN THE RANGE OF A FEW MILLIMETERS TO THE FILM THICKNESS, CUTTING THE FILM LONGITUDINALLY INTO STRIPS, AND LONGITUDINALLY STRETCHING THE STRIPS HEATED TO AN EFFECTIVE STRETCHING TEMPERATURE IN A WIDE GAP IN THE RANGE OF THE INITIAL WIDTH OF THE FILM TO SEVERAL METERS.
Claim 3
Dependent Claim
22 words
A process according to claim 1 in which the second stretching is performed in two stages in stretching zones of different lengths.
Claim 4
Dependent Claim
44 words
A process according to claim 1 in which stretching is performed in the short stretching zone at a ratio lambda 1 of (2 to 6) : 1 and in the long stretching zone at a ratio lambda 2 of (1.2 to 5) : 1.
Claim 5
Dependent Claim
27 words
A process according to claim 1 in which the film is selected from the group consisting of a polyolefin, a copolymer thereof or a polymer mixture thereof.
Claim 6
Dependent Claim
14 words
A process according to claim 1 in which the film is high density polyethylene.
Claim 7
Dependent Claim
12 words
A process according to claim 1 in which the film is polypropylene.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |