US3715422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing crinkled plastic ribbon
Assignee: CHEM Ltd
•
Filing: 1970-05-18
•
Granted: 1973-02-06
•
Expires: 1990-05-18
Abstract
Abstract The present invention relates to a process for making a flatextruded yarn or ribbon of melt-extrudable thermoplastic material having a characteristic surface configuration, and to a method and apparatus for producing such yarn or ribbon.
Inventors
- 👤 S Chopra
- 👤 H Turmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D02; D02J; D02J1/00; D02J1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
176 words
A process for manufacturing a flat-extruded yarn or ribbon of melt-extrudable thermoplastic material having two opposed faces, substantially straight and parallel side edges, the overall width between said edges being within the range of about 0.01 inch to about one-quarter inch and an interior crimped region between the edges in the form of a series of blister-like depressions and protrusions on both faces, the length of said depressions and protrusions lying within the range of about one-sixteenth inch to about one-eighth inch and the depth of said depressions and protrusions lying within the range of about 0.005 inch to 0.015 inch, comprising the steps of: melt extruding a flat yarn or ribbon having a substantial viscosity gradient set therein from a melt extruder having a jet in the form of a slot and generating a substantial viscosity gradient, quenching the extruded yarn or ribbon with water to ambient temperature, and heat stretching the cooled yarn or ribbon at a temperature at or above the softening point and below the melting point of the said thermoplastic material.
Claim 2
Dependent Claim
176 words
A process for manufacturing a flat-extruded yarn or ribbon of melt-extrudable thermoplastic material having two opposed faces, substantially straight and parallel side edges, the overall width between said edges being within the range of about 0.01 inch to about one-quarter inch and an interior crimped region between the edges in the form of a series of blister-like depressions and protrusions on both faces, the length of said depressions and protrusions lying within the range of about one-sixteenth inch to about one-eighth inch and the depth of said depressions and protrusions lying within the range of about 0.005 inch to 0.015 inch, comprising the steps of: melt extruding a flat yarn or ribbon having a substantial viscosity gradient set therein from a melt extruder having a jet in the form of a slot and generating a substantial viscosity gradient, quenching the extruded yarn or ribbon with water to ambient temperature, and heat stretching the cooled yarn or ribbon at a temperature at or above the softening point and below the melting point of the said thermoplastic material.
Claim 3
Dependent Claim
69 words
A method as claimed in claim 1 wherein said stretching is obtained by driving said cooled yarn or ribbon under tension in contact against a convexedly curved surface heated at a temperature at or above the softening point and below the melting point of the said thermoplastic material, the yarn or ribbon being taken up after stretching at a faster speed than it is fed to the stretching surface.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 2 wherein the temperature of the said curved surface is maintained within the range of about 100*C. to about 160*C.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 3 wherein the said thermoplastic material is polypropylene.
Claim 6
Dependent Claim
20 words
A method as claimed in claim 4 wherein the temperature of the said curved surface is maintained at about 120*C.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 7 wherein the extruded yarn or ribbon is quenched in a liquid at ambient temperature.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 6 wherein the extruded yarn or ribbon is quenched by being continuously passed through a tube through which water at ambient temperature is continuously passed.
Claim 9
Dependent Claim
24 words
A method as claimed in claim 1 wherein the yarn or ribbon is stretched between about three and about six times its extruded length.
Claim 10
Dependent Claim
44 words
A method as claimed in claim 5 wherein the extruded yarn or ribbon is quenched by being continuously passed through a tube through which water at ambient temperature is continuously passed, and the yarn is stretched about 4 1/2 times its original extruded length.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 2 wherein the said curved surface is one side of a heated tube whereby the yarn is heated on all sides.
References Cited (Backward Citations)
US2831748A
Cited
US2816349A
Cited
US3002804A
Cited
US3354250A
Cited
US3219739A
Cited
US3408277A
Cited
US3259938A
Cited
US3366722A
Cited
US3283378A
Cited
US3266093A
Cited
US3491405A
Cited
US3489831A
Cited
US3562369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |