US4532154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a sized multifilament yarn of an aromatic polyamide
Assignee: Akzo NV
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Filing: 1984-04-12
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Granted: 1985-07-30
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Expires: 2004-04-12
Abstract
Abstract A multifilament yarn of an aromatic polyamide, in particular poly-p-phenylene terephthalamide, having a tenacity of at least 15 cN/dtex and an initial modulus of at least 400 cN/dtex is provided with a water-soluble size, the filaments of the yarn having a cohesion corresponding to a Manra number not higher than 40. The yarn is made by subjecting a non-sized yarn having a moisture content which is lower than its equilibrium moisture content, while under a tension of at most 0.25 cN/dtex, to a continuous wetting treatment with an aqueous solution of a size and subsequently winding the treated yarn into a yarn package. The yarn package contains a single continuous length of the sized yarn. The sized yarn is suitable as warp and weft yarn in the weaving industry.
Inventors
- 👤 Evert Harteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/40; D02G3/404; D02G3/406; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D06; D06B; D06B21/00; D06M; D06M13/00; D06M13/52; D06M15/00; D06M15/19; D06M15/195; D06M15/37; D06M15/507; D06M15/70; D06M23/00; D06M23/06; D10; D10B; D10B2331/00; D10B2331/02; D10B2331/021; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T442/00; Y10T442/30; Y10T442/3049; Y10T442/3057
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A process for the manufacture of a multifilament yarn provided with a water-soluble size selected from the group of film-forming materials consisting of polymers built up from acrylic acid or its derivatives and polyesters derived from at least a dicarboxylic acid, at least a diol and a sulphonated dicarboxylic acid, the filaments of the sized yarn having a cohesion corresponding to a Manra number not higher than 40, said process being characterized in that a multifilament yarn of an aromatic polyamide having a tenacity of at least 15 cN/dtex, an initial modulus of at least 400 cn/dtex, and a moisture content which is lower than the equilibrium moisture content of the yarn, is subjected, while under a tension of at most 0.25 cN/dtex, to a continuous wetting treatment with an aqueous solution of a size as aforesaid, and the yarn is subsequently wound into a yarn package.
Claim 2
Dependent Claim
147 words
A process for the manufacture of a multifilament yarn provided with a water-soluble size selected from the group of film-forming materials consisting of polymers built up from acrylic acid or its derivatives and polyesters derived from at least a dicarboxylic acid, at least a diol and a sulphonated dicarboxylic acid, the filaments of the sized yarn having a cohesion corresponding to a Manra number not higher than 40, said process being characterized in that a multifilament yarn of an aromatic polyamide having a tenacity of at least 15 cN/dtex, an initial modulus of at least 400 cn/dtex, and a moisture content which is lower than the equilibrium moisture content of the yarn, is subjected, while under a tension of at most 0.25 cN/dtex, to a continuous wetting treatment with an aqueous solution of a size as aforesaid, and the yarn is subsequently wound into a yarn package.
Claim 3
Dependent Claim
99 words
A process according to claim 1, characterized in that a substantially twistless yarn of poly-p-phenylene terephthalamide is successively passed over a feed roll and a hot roll heated to a temperature of 300° to 500° C., with the yarn tension between the feed roll and the hot roll being at least 0.5 cN/dtex, but below the value at which the single filaments break, and subsequently over a non-heated discharge roll, after which the yarn is wetted with said aqueous solution of the size by means of a rotating applicator roll, followed by winding the yarn into said yarn package.
Claim 4
Dependent Claim
32 words
A process according to claim 2, characterized in that the yarn passes over the applicator roll via an annular groove provided in the surface thereof, which groove has a substantially rectangular cross-section.
Claim 5
Dependent Claim
39 words
A process according to claim 1, 2 or 3, characterized in that the size is applied as a 20 to 40 percent by weight aqueous solution of a polyester derived from isophthalic acid, diethylene glycol and sulphonated isophthalic acid.
Claim 6
Dependent Claim
21 words
A process according to claim 1, 2 or 3, characterized in that before the size is applied, the yarn is tangled.
Claim 7
Dependent Claim
32 words
A process according to claim 1, 2 or 3, characterized in that after the size is applied, the yarn is provided with a non-ionic wax with the aid of an applicator roll.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |