US3846955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for packaging acrylic fibers
Assignee: EIDP Inc
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Filing: 1974-04-08
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Granted: 1974-11-12
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Expires: 1994-04-08
Abstract
Abstract Process for the packing, for storage and shipment, of acrylic tow comprising depositing tow into a container and an extension thereof at a temperature of between about 65* and 125*C., depending on the water content of the atmosphere used to dry the tow, and compressing the tow into the container at a pressure which does not bulge the container walls and preferably not greater than 10 psi. The packed tow has a density of at least 20 lbs./ft.3.
Inventors
- 👤 W Mattis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:15
CPC Classifications
B; B65; B65B; B65B1/00; B65B1/20; B65B1/24; B65H; B65H54/00; B65H54/76; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
223 words
Process for preparing a package of tow of acrylic fiber in a flat-sided paperboard container comprising: providing a free standing flat-sided paperboard container having the dimensions of the package to be prepared, said container having an opening at the top; providing an extending member on said top temporarily extending the height of said container; heating a tow consisting essentially of acrylic fibers to a temperature not exceeding 160* C. to provide a tow of fibers having a shrinkage of not more than 3 percent and a moisture content of not more than 2 percent by weight and advancing said tow at a rate of at least 60 yds./min. through said extending member at a temperature not exceeding 125* C., and at a minimum temperature of at least 65* C. when the heating of said tow is carried out in an atmosphere having a water vapor content of 40 percent or more by volume, and of at least about 75* C. when the heating of said tow is carried out in an atmosphere having a water vapor content of 20 percent to 40 percent by volume; compressing said deposited tow into the container to a density of at least 20 lbs./ft.3 by pressure applied substantially uniformly across the cross-section of the container defined by the opening, removing the extending member, and closing the container.
Claim 2
Dependent Claim
223 words
Process for preparing a package of tow of acrylic fiber in a flat-sided paperboard container comprising: providing a free standing flat-sided paperboard container having the dimensions of the package to be prepared, said container having an opening at the top; providing an extending member on said top temporarily extending the height of said container; heating a tow consisting essentially of acrylic fibers to a temperature not exceeding 160* C. to provide a tow of fibers having a shrinkage of not more than 3 percent and a moisture content of not more than 2 percent by weight and advancing said tow at a rate of at least 60 yds./min. through said extending member at a temperature not exceeding 125* C., and at a minimum temperature of at least 65* C. when the heating of said tow is carried out in an atmosphere having a water vapor content of 40 percent or more by volume, and of at least about 75* C. when the heating of said tow is carried out in an atmosphere having a water vapor content of 20 percent to 40 percent by volume; compressing said deposited tow into the container to a density of at least 20 lbs./ft.3 by pressure applied substantially uniformly across the cross-section of the container defined by the opening, removing the extending member, and closing the container.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the temperature of the tow being advanced to said container is between about 90*-110* C.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the pressure applied is not more than about 10 psi.
Claim 5
Dependent Claim
66 words
The process of claim 1 wherein the tow to be advanced through said member is heated to a temperature between about 125* C. and 160* C. in an atmosphere containing at least 40 percent by volume water vapor until the tow contains not more than 2 percent moisture after which the tow is cooled and fed to said container at a temperature between about 75*-125* C.
Claim 6
Dependent Claim
44 words
The process of claim 1 wherein said temperature and pressure employed while advancing said tow through said member are sufficient to obtain a nonbulging container substantially filled with a self-supporting block of said tow, said block having a density of between about 25-33 lbs./ft.3.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the acrylic fiber is a monocomponent fiber crimped to a level between about 5-15 crimps/inch.
Claim 8
Dependent Claim
46 words
The process of claim 1 wherein the acrylic fiber comprising the tow consists essentially of a copolymer between about 93-95 percent acrylonitrile, between about 5-7 percent methyl acrylate and up to 0.5 percent sodium styrenesulfonate, all parts being by weight of the total polymeric components present.
References Cited (Backward Citations)
US3119212A
Cited
US3645061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |