CA1336056C - Means of producing a totally impregnated coated yarn structure - Google Patents
Means of producing a totally impregnated coated yarn structureInfo
- Publication number
- CA1336056C CA1336056C CA 599300 CA599300A CA1336056C CA 1336056 C CA1336056 C CA 1336056C CA 599300 CA599300 CA 599300 CA 599300 A CA599300 A CA 599300A CA 1336056 C CA1336056 C CA 1336056C
- Authority
- CA
- Canada
- Prior art keywords
- staple fiber
- varieties
- variety
- fibers
- nylon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
- D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
The subject of this invention is a method for producing a totally impregnated, coated yarn structure.
According to the method, a carded roving containing two varieties of staple fiber, each having a different melting point, is drawn through a tapering die heated to a temperature sufficient to melt only the staple fibers of the variety having the lower melting point. The molten liquid so produced coats and impregnates the staple fibers of the other variety.
The tapering die provides the compression needed to impregnate these fibers and to drive out any air trapped between them.
The yarn obtained by practicing this method is also claimed.
According to the method, a carded roving containing two varieties of staple fiber, each having a different melting point, is drawn through a tapering die heated to a temperature sufficient to melt only the staple fibers of the variety having the lower melting point. The molten liquid so produced coats and impregnates the staple fibers of the other variety.
The tapering die provides the compression needed to impregnate these fibers and to drive out any air trapped between them.
The yarn obtained by practicing this method is also claimed.
Description
IMPREGNATED COATED YARN STRUCTURE
Background of the Invention Field of the Invention This invention relates to the yarns which are used in the manufacture of the absorbent clothing or felt for machines in the papermaking industry. More specifically, it involves the production of a yarn whose fibrous structure has been totally impregnated and coated with an agent, such as a ! thermal plastic polymer, thereby providing a unified integrity to the final structure.
Descriptlon of the Prior Art In the processes conventionally used to coat yarns, it has proven difficult for the coating or encapsulating agent to penetrate to the core of the yarn structure because of the density of the individual fibers. As a result, impregnation is often incomplete and some air remains trapped in the regions between these individual fibers. A yarn of less-than-optimum strength and integrity is often the outcome.
Summary of the Invention It i8 the purpose of this invention to provide both a yarn whose fibers are oompletely encapsulated and embedded in a desired coating agent and a means to produce such a yarn.
This has been accomplished by producing a carded roving containing two staple fibers with diffërent melting temperatures, as is the case, for example, with nylon and polyester. The carded roving is then twisted to the desired degree of tightness, as expressed in number of turns per inch, and then passed through the orifice of a heated die.
I 33~056 The hole through the die gradually narrows or tapers in the direction of travel o~ the fibers being passed through.
The temperature of the die must be controlled so that only the fibers having the lower melting point will become fluid, and flow completely around those having the higher melting point. At,the same time, that temperature must be j lower than that which would damage the fibers to be coated and encapsulated. The twist of the fibers of the unmelted component is not affected by the ~eat and maintains the same degree of tightness. In addition, the taper of the die j compresses the molten fluid and forces out any air bubbles present.
j Once the structure exits from the die, the molten fluid solidifies as it is cooled by the ambient air. The resulting yarn has a structure of twisted staple fibers completely i, bounded by thermoplastic material and void of any trapped air ~ bubbles.
j A number of paired fiber combination have been tried and found workable. In the listing to follow, the first polymer of each blend has the lower melting temperature.
1. nylon and polyester 2. nylon and Nomex*
Background of the Invention Field of the Invention This invention relates to the yarns which are used in the manufacture of the absorbent clothing or felt for machines in the papermaking industry. More specifically, it involves the production of a yarn whose fibrous structure has been totally impregnated and coated with an agent, such as a ! thermal plastic polymer, thereby providing a unified integrity to the final structure.
Descriptlon of the Prior Art In the processes conventionally used to coat yarns, it has proven difficult for the coating or encapsulating agent to penetrate to the core of the yarn structure because of the density of the individual fibers. As a result, impregnation is often incomplete and some air remains trapped in the regions between these individual fibers. A yarn of less-than-optimum strength and integrity is often the outcome.
Summary of the Invention It i8 the purpose of this invention to provide both a yarn whose fibers are oompletely encapsulated and embedded in a desired coating agent and a means to produce such a yarn.
This has been accomplished by producing a carded roving containing two staple fibers with diffërent melting temperatures, as is the case, for example, with nylon and polyester. The carded roving is then twisted to the desired degree of tightness, as expressed in number of turns per inch, and then passed through the orifice of a heated die.
I 33~056 The hole through the die gradually narrows or tapers in the direction of travel o~ the fibers being passed through.
The temperature of the die must be controlled so that only the fibers having the lower melting point will become fluid, and flow completely around those having the higher melting point. At,the same time, that temperature must be j lower than that which would damage the fibers to be coated and encapsulated. The twist of the fibers of the unmelted component is not affected by the ~eat and maintains the same degree of tightness. In addition, the taper of the die j compresses the molten fluid and forces out any air bubbles present.
j Once the structure exits from the die, the molten fluid solidifies as it is cooled by the ambient air. The resulting yarn has a structure of twisted staple fibers completely i, bounded by thermoplastic material and void of any trapped air ~ bubbles.
j A number of paired fiber combination have been tried and found workable. In the listing to follow, the first polymer of each blend has the lower melting temperature.
1. nylon and polyester 2. nylon and Nomex*
3. polyester and Nomex 4. nylon and Kevlar**
5. polyester and Kevlar j 6. nylon and acrylic ; 7. polyester and acrylic Blends wherein the lower melting point fibers account for percentages by weight in the range from 25% to 75% of the combination have been tested. In practice, the choice of proportion of low-melt to high-melt fibers is governed by the amount of fiber encapsulation required. It is important to note that, in general, the higher the percentage of low-melt fiber, the stiffer will be the resulting yarn, the process is * No~ex is a trade-mark of ~. I. Du Pont de Nemours and Company for a fibrous material obtained frcQ a polymer of m-phenylenedi~mine and isorhth~loyl chloride.
** Kevlar is a trade-mark of E. I. Du Pont de Ne~ours and Company for an aramid fiber produced by a modifled polyamid.
1 33~05~
therefore capable of being engineered to produce yarns having specific properties.
The advantages of these yarns are strength, uniform structural integrity, and the total encapsulation of fibers within a thermal plastic coating.
Brief Description of the Drawing Figure 1 illustrates the manner in which the totally impregnated, coated yarn structure can be produced.
Description of the Preferred Embodiment On the left side of Figure 1 i8 depicted a carded roving 1 of two staple fibers, identified as low-melt 2 and high-melt 3 components, twisted together to a desired degree of tightness by suitable means not shown. The twisted strand of carded roving 1 is drawn through a heated, compressing die 4, in the direction indicated by the arrow, by another suitable means, also not shown.
The die 4 is tapered, as shown, can be made of teflon, and 19 posltloned and flxed ln a metal dle retalner 5, which supplies the necessary heat to the die 4. Heat from the die 4 melts the low-melt component 2, and, in the course of passage through the die 4, the compression that arises from the taper in the die 4 forces the molten low-melt component 2 completely around the fibers of the high-melt component 3.
Air remaining in the spaces between the fibers of the high-melt component 3 is forced out by the compressing action of the die 4.
Emerging from the die 4 on the right side of Figure 1 is a strand of yarn 6 made up of fibers of the high-melt component 3 which have been coated and totally impregnated with the low-melt component 2.
Other modifications to the totally impregnated, coated yarn and to the method of producing it would be obvious to one skilled in the art without departing from the scope of the invention as defined by the appended claims.
-- ~~
.
** Kevlar is a trade-mark of E. I. Du Pont de Ne~ours and Company for an aramid fiber produced by a modifled polyamid.
1 33~05~
therefore capable of being engineered to produce yarns having specific properties.
The advantages of these yarns are strength, uniform structural integrity, and the total encapsulation of fibers within a thermal plastic coating.
Brief Description of the Drawing Figure 1 illustrates the manner in which the totally impregnated, coated yarn structure can be produced.
Description of the Preferred Embodiment On the left side of Figure 1 i8 depicted a carded roving 1 of two staple fibers, identified as low-melt 2 and high-melt 3 components, twisted together to a desired degree of tightness by suitable means not shown. The twisted strand of carded roving 1 is drawn through a heated, compressing die 4, in the direction indicated by the arrow, by another suitable means, also not shown.
The die 4 is tapered, as shown, can be made of teflon, and 19 posltloned and flxed ln a metal dle retalner 5, which supplies the necessary heat to the die 4. Heat from the die 4 melts the low-melt component 2, and, in the course of passage through the die 4, the compression that arises from the taper in the die 4 forces the molten low-melt component 2 completely around the fibers of the high-melt component 3.
Air remaining in the spaces between the fibers of the high-melt component 3 is forced out by the compressing action of the die 4.
Emerging from the die 4 on the right side of Figure 1 is a strand of yarn 6 made up of fibers of the high-melt component 3 which have been coated and totally impregnated with the low-melt component 2.
Other modifications to the totally impregnated, coated yarn and to the method of producing it would be obvious to one skilled in the art without departing from the scope of the invention as defined by the appended claims.
-- ~~
.
Claims (10)
1. A method for producing a totally impregnated, coated yarn structure comprising:
providing a carded roving containing two varieties of staple fiber, each said variety having a different melting temperature;
maintaining a heated die, having a tapering passage, at a temperature between the melting temperatures of the two said varieties of staple fiber; and drawing the carded roving through said heated die, whereby the variety of staple fiber having the lower melting temperature melts and totally impregnates and coats the variety of staple fiber having the higher melting temperature.
providing a carded roving containing two varieties of staple fiber, each said variety having a different melting temperature;
maintaining a heated die, having a tapering passage, at a temperature between the melting temperatures of the two said varieties of staple fiber; and drawing the carded roving through said heated die, whereby the variety of staple fiber having the lower melting temperature melts and totally impregnates and coats the variety of staple fiber having the higher melting temperature.
2. A method as described in claim 1, comprising the additional step of twisting the carded roving containing the two varieties of staple fiber before drawing said carded roving through said heated die.
3. A method as described in claim 1, wherein the variety of staple fiber having the lower melting temperature represents a percentage by weight lying in the range from 25%
to 75% of the total of the two varieties of staple fiber.
to 75% of the total of the two varieties of staple fiber.
4. A method as described in claim 1, wherein the two varieties of staple fiber are nylon and polyester.
5. A method as described in claim 1, wherein the two varieties of staple fiber are nylon and fibers obtained from a polymer of m-phenylenediamine and isophthaloyl chloride.
6. A method as described in claim 1, wherein the two varieties of staple fiber are polyester and fibers obtained from a polymer of m-phenylenediamine and isophthaloyl chloride.
7. A method as described in claim 1, wherein the two varieties of staple fiber are polyester and fibers obtained from a polymer of paraphenylenediamine and terephthalic acid.
8. A method as described in claim 1, wherein the two varieties of staple fiber are nylon and acrylic.
9. A method as described in claim 1, wherein the two varieties of staple fiber are polyester and acrylic.
10. A method as described in claim 1, wherein the two varieties of staple fiber are nylon and fibers obtained from a polymer of paraphenylenediamine and terephthalic acid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19238788A | 1988-05-10 | 1988-05-10 | |
| US192,387 | 1988-05-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1336056C true CA1336056C (en) | 1995-06-27 |
Family
ID=22709436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 599300 Expired - Fee Related CA1336056C (en) | 1988-05-10 | 1989-05-10 | Means of producing a totally impregnated coated yarn structure |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP2703614B2 (en) |
| BR (1) | BR8901988A (en) |
| CA (1) | CA1336056C (en) |
| DE (1) | DE3913788A1 (en) |
| FI (1) | FI89079C (en) |
| GB (1) | GB2218432B (en) |
| SE (1) | SE508608C2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4036926A1 (en) * | 1990-11-20 | 1992-05-21 | Basf Ag | METHOD FOR PRODUCING HYBRID YARN |
| DE4321560A1 (en) * | 1993-06-29 | 1995-01-12 | Danubia Petrochem Deutschland | Polyolefin yarn and fabric |
| DE19961216A1 (en) * | 1999-12-15 | 2001-06-28 | Hempage Ag | Reinforcement material, process for its manufacture and use of the reinforcement material |
| US20070269654A1 (en) * | 2002-10-10 | 2007-11-22 | Veillat Cyril D | Process for Making a Monofilament-Like Product |
| US6808548B2 (en) * | 2002-12-31 | 2004-10-26 | Hollinee Glass Corporation | Three component filtration material |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7340070U (en) * | 1974-12-05 | Textilwerk Goch Gmbh | Yarn made from synthetic fibers | |
| DE72939C (en) * | D. MATTEI in Genua, Italien | Method and apparatus for dyeing textile fibers in the form of card tapes or roving | ||
| GB1085567A (en) * | 1965-06-28 | 1967-10-04 | Ici Ltd | Improvements in or relating to compact filament bundles and their production |
| GB1185623A (en) * | 1966-04-30 | 1970-03-25 | Bondina Ltd | A method of Forming a Bonded Textile Product |
| US3694131A (en) * | 1971-03-25 | 1972-09-26 | Dart Ind Inc | Die for impregnating and coating filamentary material |
| JPS4936058A (en) * | 1972-08-09 | 1974-04-03 | ||
| NL7508486A (en) * | 1975-07-16 | 1977-01-18 | Tno | CHAIN YARN. |
| FR2348988A1 (en) * | 1976-04-20 | 1977-11-18 | Inst Textile De France | PROCEDURE FOR OBTAINING A FANTASY WIRE AND THREAD SO OBTAINED |
| US4275117A (en) * | 1977-09-02 | 1981-06-23 | Ashaway Line & Twine Mfg. Co. | String construction produced by subjecting a fibrous strand composed of fibrous materials having differing melting points to heating conditions sufficient to melt some but not all of the fibrous materials |
| JPS5716934A (en) * | 1980-06-27 | 1982-01-28 | Fujikura Ltd | Aromatic polyamide twisted yarn |
| US4470941A (en) * | 1982-06-02 | 1984-09-11 | Bioresearch Inc. | Preparation of composite surgical sutures |
-
1989
- 1989-02-01 GB GB8902216A patent/GB2218432B/en not_active Expired - Fee Related
- 1989-02-15 FI FI890731A patent/FI89079C/en not_active IP Right Cessation
- 1989-03-08 JP JP1053943A patent/JP2703614B2/en not_active Expired - Lifetime
- 1989-04-07 SE SE8901249A patent/SE508608C2/en not_active IP Right Cessation
- 1989-04-26 DE DE19893913788 patent/DE3913788A1/en not_active Ceased
- 1989-04-27 BR BR898901988A patent/BR8901988A/en not_active IP Right Cessation
- 1989-05-10 CA CA 599300 patent/CA1336056C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR8901988A (en) | 1989-12-05 |
| SE508608C2 (en) | 1998-10-19 |
| JP2703614B2 (en) | 1998-01-26 |
| SE8901249D0 (en) | 1989-04-07 |
| GB2218432A (en) | 1989-11-15 |
| JPH0214038A (en) | 1990-01-18 |
| FI890731A (en) | 1989-11-11 |
| FI890731A0 (en) | 1989-02-15 |
| SE8901249L (en) | 1989-11-11 |
| FI89079B (en) | 1993-04-30 |
| DE3913788A1 (en) | 1989-11-23 |
| FI89079C (en) | 1993-08-10 |
| GB8902216D0 (en) | 1989-03-22 |
| GB2218432B (en) | 1992-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |