EP2235244B1 - Method for producing a textile article comprising a staple fibre yarn and textile article - Google Patents

Description

The present invention relates to a method for producing a textile article and a textile article.

Staple fiber yarn textile articles made from aramid staple fibers are made EP-B 1 099 088 known. Such articles, such as gloves, have high abrasion resistance and high cut resistance, but are correspondingly expensive because of the high quality aramid fibers processed therein.

A method according to the preamble of claim 1 is made WO-A-02/052077 known. The document teaches that in a staple fiber yarn up to 40% by weight of the high-cut pile fibers can be replaced by synthetic staple fibers. EP-A-1 862 572 Teaches a weight ratio of g5: 5 to 50:50 without any statements about abrasion resistance.

Therefore, the present invention has the object to provide textile articles available that can be offered cheaper, but without losing abrasion resistance.

• entweder am Stapelfasergarn durchgeführt wird, wonach aus dem geschrumpften Stapelfasergarn der Artikel hergestellt wird,
• oder an dem das ungeschrumpfte Stapelfasergarn enthaltenden Artikel durchgeführt wird.

This object is achieved by a method for producing a textile article using a staple fiber yarn comprising at least one thread, wherein the thread comprises a mixture of first staple fibers and second staple fibers, wherein the first staple fibers are made of high-strength filaments having a tensile strength of at least 80 cN / tex, the second staple fibers have a shrinkage in the range of 5% to 50%, the weight ratio of the first staple fibers to the second staple fibers in the at least one twist A: B, and A: B is in the range of 5:95 to 45:55, which method involves shrinkage, and shrinkage

• either on the staple fiber yarn, after which the shredded staple fiber yarn is used to make the article,
• or at which the unrestrained staple fiber yarn containing article is carried out.

Surprisingly, the textile article according to the invention has an abrasion resistance which is similar to or even higher than that of a suitably produced textile article whose staple fiber yarn consists exclusively of first staple fibers, the article according to the invention, in view of its content of first staple fibers of high-tenacity filaments, due to the Ratio A: B in the range of 5:95 to 45:55 is always smaller than the proportion of the second staple fibers, yet has a cut resistance, which is surprising in comparison with a comparative article made exclusively from the first staple fibers of high strength filaments is low.

Therefore, in addition to the above-described method for producing a textile article, the textile article produced by this method belongs to the present invention.

Thus, the present invention makes textile articles accessible for the first time, which - because the second staple fibers contained in the article according to the invention are significantly cheaper than the first staple fibers - can be offered correspondingly more favorably. In one particular embodiment of the textile article according to the invention, the abrasion resistance is increased by 81%, the cut resistance being only 11% lower than in a similarly produced textile article of a staple fiber yarn whose staple fibers consist exclusively of first staple fibers of high-tenacity filaments ( A: B = 100: 0).

The staple fiber yarn comprises at least one twine, wherein the twine comprises a mixture of first and second staple fibers. this means in the context of the present invention, that intimate mixing of the first and second staple fibers is present in each volume element of the staple fiber yarn such that the staple fiber yarn is substantially free of any core / shell structure with respect to the first and second staple fibers, and preferably entirely free of any core / Sheath structure with respect to the first and second staple fibers.

The staple fiber yarn comprises at least one twine comprising first staple fibers made from high tenacity filaments having a tenacity of at least 80 cN / tex. Below a tear strength of 80 cN / tex, the cut resistance of the textile article made of the staple fiber yarn is too low. Preferably, the first staple fibers of the staple fiber yarn are made of high tenacity filaments having a tenacity of at least 120 cN / tex, more preferably at least 150 cN / tex, and most preferably 190 cN / tex.

The first staple fibers can be made by tearing corresponding high strength filaments, resulting in first staple fibers having a length distribution due to the tearing process. Alternatively, the first staple fibers may be made by cutting corresponding high strength filaments, resulting in first staple fibers having a uniform length, preferably in the range of 10 mm to 200 mm, and more preferably in the range of 30 to 60 mm.

In a preferred embodiment, the first staple fibers are selected from at least one of the groups comprising aramid staple fibers, polybenzoxazole staple fibers, and polybenzothiazole staple fibers. In the context of the present invention, this means that the first staple fibers are selected either from aramid staple fibers only or only from polybenzoxazole staple fibers or only from polybenzothiazole staple fibers.

Furthermore, in the context of the present invention, this means that the first staple fibers can also consist of a mixture of aramid staple fibers with polybenzoxazole and / or polybenzothiazole staple fibers.

In the context of the present invention, aramid staple fibers mean staple fibers made from aramids, i. are prepared from aromatic polyamides wherein at least 85% of the amide (-CO-NH-) bonds are bonded directly to two aromatic rings. An aromatic polyamide particularly preferred for the present invention is poly-para-phenylene terephthalamide, a homopolymer resulting from the mol: mol polymerization of para-phenylenediamine and terephthalic acid dichloride. Further suitable for the present invention as aromatic polyamides are copolymers which, in addition to para-phenylenediamine and terephthalic acid dichloride, contain small amounts of other diamines and / or other dicarboxylic acid chlorides incorporated in the polymer chain. As a general rule, based on para-phenylenediamine and terephthalic acid dichloride, the other diamines and / or other dicarboxylic acid chlorides may be incorporated in the polymer chain in a proportion of up to 10 mol%.

In staple fiber yarn, the first staple fibers used therein, e.g. also the aramid staple fibers, as good as new staple fibers. However, in staple fiber yarn, first staple fibers, e.g. also aramid staple fibers, from up to 100 wt .-% recycled staple fibers are used.

In the context of the present invention, polybenzoxazole staple fibers and polybenzothiazole staple fibers mean staple fibers made from polybenzoxazoles or from polybenzothiazoles, ie from polymers having the structural units shown below, wherein the aromatic groups attached to the nitrogen are preferably carbocyclic, as shown in the structural units. However, said groups may also be heterocyclic. Further, the nitrogen-bonded aromatic groups are preferable six-membered rings as shown in the structural units. However, said groups may also be formed as fused or unfused polycyclic systems.

In a preferred embodiment, the staple fiber yarn has first staple fibers with a titre in the range from 0.1 dtex to 10 dtex, more preferably in the range from 0.5 dtex to 5 dtex and in particular in the range from 0.5 dtex to 2.5 dtex ,

The staple fiber yarn has second staple fibers which have a shrinkage in the range of 5% to 50%. Below a shrinkage of 5%, the cut resistance of the textile article produced from the staple fiber yarn according to the invention is too low. Above a shrinkage of 50%, the shrunken textile article is too stiff and offers too little wearing comfort.

Preferably, the second staple fibers have a shrinkage in the range of 7% to 40%, more preferably in the range of 8% to 35% and most preferably in the range of 9% to 30%.

The second staple fibers can be produced by tearing corresponding filaments with the shrinkage required according to the invention, resulting in second staple fibers having a length distribution caused by the tearing process. Alternatively, the second staple fibers can be made by cutting corresponding filaments with the shrinkage required by the invention, resulting in second staple fibers having a uniform length, preferably in the range of 10 mm to 200 mm, and more preferably in the range of 30 to 60 mm.

In another preferred embodiment, the second staple fibers are staple thermoplastic fibers, which are preferably selected from at least one of the groups comprising polyacrylonitrile staple fibers and polyetheretherketone staple fibers. In the context of the present invention, this means that the second staple fibers are preferably selected from either only polyacrylonitrile staple fibers or only polyetheretherketone staple fibers. Furthermore, in the context of the present invention, this means that the second staple fibers in a further preferred embodiment may consist of a mixture of polyacrylonitrile staple fibers with polyetheretherketone staple fibers, with an increasing proportion of polyetheretherketone staple fibers the heat resistance of the textile article according to the invention produced from the staple fiber yarn according to the invention increases.

besteht, wobei die restlichen bis zu 15 Gew.-% ethylenische Monomere sein können, die - einzeln oder im Gemisch - mit Acrylnitril copolymerisierbar sind, wie z.B. Ester der Acrylsäure und Methacrylsäure (Methylacrylat, Ethylacrylat, Methylmethacrylat, Ethylmethacrylat usw.), Vinylacetat, Vinylchlorid, Vinylidenchlorid, Acrylamid, Methacrylamid oder Methacrylnitril.In the context of the present invention, polyacrylonitrile staple fibers mean staple fibers made from a polymer containing at least 85% by weight of acrylonitrile units

the remainder being up to 15% by weight of ethylenic monomers copolymerizable individually or in admixture with acrylonitrile, such as esters of acrylic acid and methacrylic acid (methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, etc.), vinyl acetate, Vinyl chloride, vinylidene chloride, acrylamide, methacrylamide or methacrylonitrile.

In the context of the present invention, polyetheretherketone staple fibers mean staple fibers made from a polymer in which phenyl radicals are linked via ether or keto groups in a sequence in which two ether linkages are followed by a keto linkage.

In a preferred embodiment, the staple fiber yarn has second staple fibers with a titre in the range from 0.1 dtex to 20 dtex, more preferably in the range from 0.5 dtex to 5 dtex and in particular in the range from 0.9 dtex to 2.5 dtex ,

The staple fiber yarn comprises at least one thread, preferably two or three or four threads.

Preferably, each of the yarns has a linear density in the range from 100 dtex to 10000 dtex, more preferably in a range from 120 dtex to 5000 dtex and in particular in a range from 200 dtex to 2000 dtex and corresponding Nm values (Nm = 1000 / tex). ,

In a preferred embodiment, A: B is in the range of 10:90 to 40:60.

1. a) Zur Verfügung stellen von ersten Stapelfasern und zweiten Stapelfasern, wobei die ersten Stapelfasern aus hochfesten Filamenten hergestellt sind, die eine Reißfestigkeit von mindestens 80 cN/tex aufweisen, und wobei die zweiten Stapelfasern einen Schrumpf im Bereich von 5 % bis 50 % aufweisen.
2. b) Mischen der ersten und zweiten Stapelfasern durch Herstellen eines Vorbandes, wobei das Mischen so durchgeführt wird, dass in jedem Volumenelement des herzustellenden Stapelfasergarns eine innige Vermischung der ersten und zweiten Stapelfasern vorliegt, sodass das resultierende Stapelfasergarn im wesentlichen frei von jeglicher Kern/Mantel-Struktur hinsichtlich der ersten und zweiten Stapelfasern ist, und wobei das Gewichtsverhältnis von ersten Stapelfasern : zweiten Stapelfasern im Bereich von 5 : 95 bis 45 : 55, vorzugsweise im Bereich von 10: 90 bis 40 : 60 liegt, und
3. c) Verspinnen des in Schritt b) resultierenden Vorbandes zu mindestens einem Zwirn.

The staple fiber yarn may, in principle, be made by any process for making a staple fiber yarn, such as by a process comprising the steps

1. a) providing first staple fibers and second staple fibers, wherein the first staple fibers are made of high strength filaments having a tear strength of at least 80 cN / tex, and wherein the second staple fibers have a shrinkage in the range of 5% to 50%.
2. b) mixing the first and second staple fibers by making a pre-strip, wherein mixing is performed so that there is intimate mixing of the first and second staple fibers in each volume element of the staple fiber yarn to be produced so that the resulting staple fiber yarn is substantially free of any core / shell yarn. Is structure with respect to the first and second staple fibers, and wherein the weight ratio of first staple fibers: second staple fibers is in the range of 5:95 to 45:55, preferably in the range of 10:90 to 40:60, and
3. c) spinning the preliminary strip resulting in step b) into at least one twisted yarn.

The above-mentioned process features have the corresponding meaning explained at the beginning in the description of the staple fiber yarn.

In the process according to the invention, the shrinkage is carried out by heating the staple fiber yarn at a shrinkage temperature T _s which is above the glass transition temperature T _g and below the melting temperature T _{m of} the material constituting the second staple fibers. The shrinkage can be carried out in a dry, steam-saturated or wet atmosphere, ie as hot air, Stattdampf- or cooking shrinkage.

If the shrinkage of the staple fiber yarn is carried out prior to its processing into the textile article according to the invention, the Staple yarn during shrinkage are on a coil, which is located in one of the aforementioned atmospheres. Alternatively, the staple fiber yarn may be unwound from the spool and passed through one of the stated atmospheres.

If the shrinkage is carried out on the article containing the staple fiber yarn, the textile article according to the invention containing the staple fiber yarn is introduced into one of the said atmospheres and the shrinkage of the staple fiber yarn is initiated in the temperature range mentioned.

As already mentioned, the shrinkage in the process according to the invention for the production of a textile article is carried out at a shrinkage temperature T _s which lies in the range T _g <T _s <T _m . For a large number of the materials forming the second staple fibers, in particular for thermoplastic polymers, T _s extends in a range from 100 ° C. to 150 ° C., in particular in a range from 110 ° C. to 140 ° C., for which reason the ranges mentioned in the process according to the invention preferred or particularly preferred.

In order for the shrinkage to take place to a sufficient extent in the process according to the invention for producing the textile article according to the invention, a shrinkage time t _s in the range from 20 seconds to 700 seconds, in particular from 30 seconds, is sufficient for a large number of the materials forming the second staple fibers, in particular for thermoplastic polymers 240 seconds and most preferably from 50 seconds to 180 seconds.

The use of the staple fiber yarn in the process according to the invention for producing a textile article may be in the form of any of the known processes by which textile articles are produced from staple fiber yarns, but preferably by knitting, knitting, braiding or weaving.

If the use of the staple fiber yarn by knitting takes place in the method according to the invention for producing a textile article, the knitting is preferably effected with a needle spacing of 7 gg to 18 gg (1 gg means 1 needle per 2.54 cm) and a row density in the range of 3 per cm to 12 per cm and in sticks in the range of 3 per cm to 12 per cm.

For example, in the manufacture of the article of the present invention, the staple fiber yarn may be made of a single twist, e.g. a knitting, knitting, braiding or weaving device are supplied. However, a staple fiber yarn of two or three or four plys may also be fed to one of said devices, wherein the two, three or four plys may be fed in parallel to the device. Alternatively, the two, three or four threads may first be twisted around each other and then fed to the apparatus which manufactures the textile article of the invention.

The object underlying the present invention is finally achieved by a textile article which has been produced by the process according to the invention.

In preferred embodiments, the textile article according to the invention is a glove, an apron, a trouser, a jacket, a cuff, a hose, a hose wrap or a vandalism resistant article.

The present invention will be further illustrated in the following examples.

Example 1a

As first staple fibers, 50 mm p-aramid staple fibers (Type 1072 from Teijin Aramid) made by cutting p-aramid filament yarn (Type 1012 from Teijin Aramid) with a filament titer of 1.7 dtex are provided.

As the second staple fibers, 50 mm-long polyacrylonitrile staple fibers (type SHK1.3 / 50 from Dyvertex) made by cutting polyacrylonitrile filament yarn having a filament titer of 1.3 dtex are provided. The polyacrylonitrile staple fibers have a shrinkage of 19.1% measured according to DIN 53866, part 3 (March 1979) with a shrinking time of 15 minutes, a shrinking temperature of 190 ° C. and a preloading of 240 mg.

30 parts by weight of the first staple fibers are intimately mixed with 70 parts by weight of the second staple fibers by ribbon mixing and a staple fiber yarn is made, which consists of a thread with Nm 28/1 (36 tex). Four of these threads are twisted around each other, fed to a knitting machine and knitted into a glove, the needle spacing being 7 gg (7 needles per 2.54 cm), the stitch density of the glove before shrinking in row 3.5 per cm and in sticks 3, 5 per cm.

Example 1b

Example 1b is carried out as Example 1a with the difference that in the manufacture of the glove a yarn with Nm 28/1 (36 tex) is fed to the knitting machine, the needle spacing is 13 gg (13 needles per 2.54 cm) and the stitch density of the glove before shrinking in row 8 per cm and in sticks 6 per cm.

Comparative Example C1

50 mm p-aramid staple fibers (type 1072 from Teijin Aramid) are prepared by cutting p-aramid filament yarn (type 1012 from Teijin Aramid) with a filament titer of 1.7 dtex.

From the o.g. Staple fibers are made of a staple fiber yarn, which consists of a twisted yarn with Nm 28/1 (36 dtex). Four of these threads are twisted around each other, fed into a knitting machine and knitted into a glove, the needle spacing being 7gg (7 needles per 2.54 cm), the mesh density in the row 3.5 per cm and in sticks 3.5 per cm.

Comparative Example V2

Comparative Example C2 is carried out as Comparative Example C1, with the difference that a yarn is fed to the knitting machine, the needle spacing being 13 gg and the mesh density in row 8 per cm and in bars 6 per cm.

On the gloves according to the invention prepared according to Examples 1a-b and on the comparative gloves prepared according to Comparative Examples V1 and V2, the lowest single-cut index NESI and the abrasion resistance are determined according to EN 388 as the number of turns TZ until the formation of holes. Thereafter, the gloves produced according to the invention are shrunk in a hot air oven at a shrinkage temperature T _s = 130 ° C in a shrinkage time t _s = 120 seconds and measured again NESI and TZ.

The results are summarized in the following table. Here, A / B means the weight ratio of p-aramid staple fibers: polyacrylonitrile staple fibers in the staple fiber yarn of the invention, gg the needle pitch of the knitting machine, NESI uncut or shrunk the lowest single cut index, ie, the cut resistance before or after shrinking and TZ unhardened or shrunk as the number of revolutions Abrasion resistance before or after shrinking specified until the formation of the hole. Examples FROM gg NESI unconsolidated NESI shrunk TZ unshrinked TZ shrunk 1a 30:70 7 2.8 5.7 406 904 1b 30:70 13 2.5 1.8 96 202 V1 100: 0 7 6.4 - 500 - V2 100: 0 13 2.7 - 200 -

The comparison of Example 1a with Comparative Example C1 shows that the glove according to the invention, which was produced and shrunk with the staple fiber yarn according to the invention, has only 11% lower cut resistance and 81% higher abrasion resistance than the comparison glove, although in the staple fiber yarn of the invention Glove 70% of the p-aramid staple fibers were replaced by polyacrylonitrile staple fibers.

The comparison of Example 1b with Comparative Example C2 shows that the glove according to the invention, which was produced and shrunk with the staple fiber yarn according to the invention, although a 33% lower cut resistance but has virtually the same abrasion resistance as the comparison glove, although 70% of the p-aramid staple fibers were replaced by polyacrylonitrile staple fibers in the staple fiber yarn of the glove of the present invention.

Claims (17)

1. Method for producing a textile article by the use of a staple fiber yarn comprising at least one twisted thread, wherein the twisted thread comprises a mixture of first staple fibers and second staple fibers, wherein the first staple fibers are produced from high strength filaments that have a breaking tenacity of at least 80 cN/tex, the second staple fibers have a shrinkage in the range from 5% to 50%,
   wherein the method comprises shrinkage, and the shrinkage is implemented

   - either on the staple fiber yarn, after which the article is produced from the shrunken staple fiber yarn,

   - or on the article containing the non-shrunken staple fiber yarn, characterized in that the weight ratio of the first staple fibers to the second staple fibers in the at least one twisted thread is A:B, and A:B lies in the range from 5:95 to 45:55.
2. Method according to Claim 1, characterized in that the first staple fibers are produced from high strength filaments that have a breaking tenacity of at least 120 cN/tex.
3. Method according to Claim 1 or 2, characterized in that the first staple fibers are selected from at least one of the groups comprising aramid staple fibers, polybenzoxazole staple fibers, and polybenzothiazole staple fibers.
4. Method according to one or more of Claims 1 to 3, characterized in that the first staple fibers have a linear density in the range from 0.1 dtex to 10 dtex.
5. Method according to one or more of Claims 1 to 4, characterized in that the second staple fibers have a shrinkage in the range from 7% to 40%.
6. Method according to one or more of Claims 1 to 5, characterized in that the second staple fibers are thermoplastic staple fibers.
7. Method according to Claim 6, characterized in that the thermoplastic staple fibers are selected from at least one of the groups comprising polyacrylonitrile staple fibers and polyether ether ketone staple fibers.
8. Method according to one or more of Claims 4 to 7, characterized in that the second staple fibers have a linear density in the range from 0.1 dtex to 20 dtex.
9. Method according to one or more of Claims 1 to 8, characterized in that the staple fiber yarn comprises two or three or four twisted threads.
10. Method according to Claim 9, characterized in that each of the twisted threads has a linear density in the range from 100 dtex to 10,000 dtex.
11. Method according to one or more of Claims 1 to 10, characterized in that the weight ratio A:B of first staple fibers:second staple fibers lies in the range from 10:90 to 40:60.
12. Method according to one or more of Claims 1 to 11, characterized in that the shrinkage is implemented at a shrinkage temperature T_s in the range from 100ºC to 150ºC.
13. Method according to one or more of Claims 1 to 12, characterized in that the shrinkage is implemented for a shrinkage time t_s of 20 seconds to 700 seconds.
14. Method according to one or more of Claims 1 to 13, characterized in that the use occurs by knitting, crocheting, plaiting, or weaving.
15. Method according to Claim 14, characterized in that the knitting occurs using a needle gauge of 7 gg to 18 gg and a mesh density in the range from 3 per cm to 12 per cm in the courses and in the range from 3 per cm to 12 per cm in the wales.
16. Textile article produced according to the method according to one or more of Claims 1 to 15.
17. Textile article according to Claim 16, characterized in that the article is a glove, an apron, a pair of pants, a jacket, a sleeve, a hose, a hose jacket, or a vandalism-resistant article.