tissue

Abstract

Fabric (100) made from a first yarn (101) selected from a group containing flame-resistant fibers, in particular aramids, polyimides, polyamide-imides, polybenzimidazole, poly(p-phenylene-2,6-benzobisoxazole), viscose FR and modacrylic, as well as mixtures thereof, and wherein the fabric comprises at least one further, second yarn (102) containing fibers of a liquid crystal polymer (LCP), wherein the second yarn (102) is designed as a multifilament yarn, characterized in that the filaments of the second yarn have a core of a liquid crystal polymer (LCP), and wherein the core of the filaments is surrounded by a sheath of a dyeable material chemically compatible with the core material.

Description

[0001] The invention relates to a fabric made from a first yarn selected from a group containing flame-resistant fibers, in particular aramids, polyimides, polyamide-imides, polybenzimidazole (PBI), poly(p-phenylene-2,6-benzobisoxazole), viscose FR and modacrylic, as well as mixtures thereof, and wherein the fabric comprises at least one further, second yarn containing fibers made from a liquid crystal polymer (LCP), wherein the second yarn is designed as a multifilament yarn, and to protective clothing made therefrom.

[0002] Protective clothing, especially for firefighters, is subject to stringent requirements for its outer fabric. On the one hand, sufficient heat resistance must be guaranteed; on the other hand, this outer fabric must also be able to withstand high mechanical stresses. The tear resistance of the outer fabric is therefore a particularly important criterion. Aramid-based fabrics are primarily used for this purpose.

[0003] A typical aramid fabric, according to the state of the art, consists predominantly of 75% m-aramid, 23% p-aramid, and 2% antistatic fibers, or a PBI fabric of 58% p-aramid, 40% PBI, and 2% antistatic fibers. However, the abrasion resistance of p-aramid is rather low, and the fabric frays easily.

[0004] Furthermore, high-strength and flame-resistant fabrics are described that combine m-aramid with another liquid crystal polymer fiber. For example, DE 10 2013 214 999 A1 discloses a fabric of the type mentioned above, in which a mixture of an aramid and an aromatic polyester is present. The aromatic polyester can be, in particular, VECTRAN. ® (registered trademark of Kuraray Co., Ltd.)

[0005] The VECTRAN used here ® This has the disadvantage that it cannot be dyed, or only to a limited extent. This leads to undesirable, non-uniformly colored fabrics.

[0006] For this reason, EP 3 875 650 B1 discloses a fabric with an aromatic polyester, in particular VECTRAN. ® , which is woven in such a way that the threads of the aromatic polyester do not appear on the front of the fabric.

[0007] It is therefore an object of the invention to provide a fabric which, in particular as an outer fabric, meets the requirements for protective clothing of fire brigades with regard to heat resistance and tear resistance and can additionally be uniformly dyed.

[0008] This problem is solved according to the invention by the fact that the filaments of the second yarn have a core made of a liquid crystal polymer (LCP), and wherein the core of the filaments is surrounded by a sheath made of a dyeable material that is chemically compatible with the core material.

[0009] For the purposes of this disclosure, the term "fabric" means a substantially planar textile structure consisting of at least two yarn systems interwoven or linked together, the yarn systems being of the same material or of different materials.

[0010] For the purposes of this disclosure, the term "yarn" refers to an essentially linear textile structure made from staple fibers, filaments, or ribbons. According to DIN 60900, these yarns can be single yarns used as individual threads, or they can be multiple individual threads plied, twisted, and / or braided together. The individual threads are either filament yarns or staple fiber yarns made from natural or synthetic fibers. The filament yarns are exclusively synthetic fibers, with the filaments being produced by appropriate spinning processes, for example, melt spinning. The filaments can be monofilaments or multifilaments.

[0011] According to the invention, the first yarn contains flame-resistant fibers, such as: - Meta-aramid (Nomex ® , Teijinconex ® , New Star ® ) - Polyimide (P84)® ) - Polyamide-imide (Kermel) ® ) - Para-Aramid (Kevlar ® , Twaron ® , Technora ® ) - Polybenzimidazole (PBI) - Poly(p-phenylene-2,6-benzobisocazole) [PBO] (Zylon ® ) - Viscose FR (Lenzing FR) ® , Birla ® Cellulose) - Modacrylic (Kanecaron) ® ) as well as their mixtures, also with additional antistatic fibers.

[0012] According to the invention, the core of the filaments of at least one second yarn consists of a liquid crystal polymer (LCP) surrounded by a sheath of a dyeable material that is chemically compatible with the core material.

[0013] These filaments are produced, for example, using a bicomponent melt spinning process, resulting in a multicomponent fiber with a core made of a liquid crystal polymer and a dyeable sheath made of a different polymer material. The sheath can have a sharp phase boundary with the core, or the sheath material can be mixed with the core material in a transition zone between the sheath and core. The sheath content of the second yarn filaments is 10% to 20% by weight, preferably 15%.

[0014] This multifilament yarn, in combination with a first yarn made of flame-resistant fibers, such as preferably aramid fibers or PBI fibers, is suitable for the production of fabrics according to the invention, which, in addition to their flame resistance, are also characterized by uniform coloring, high tear strength, high abrasion resistance and UV resistance.

[0015] Preferably, the sheath of the filaments of the second yarn contains at least one aromatic polyester, preferably polyethylene naphthalate (PEN). This aromatic polyester of the sheath of the multifilament yarn must be chemically compatible with the liquid crystal polymer in order to obtain a multifilament yarn, particularly by melt spinning. A combination in which the core of the second yarn consists of VECTRAN has proven particularly suitable. ® The first yarn is formed from a single strand, while the sheath of the filaments of the second yarn consists of polyethylene naphthalate (PEN). This is a multifilament yarn called VECTRAN MF, a product of Kuraray Co., Ltd. Investigations by the applicants have shown that this multifilament yarn is particularly suitable as the second yarn in the fabric according to the invention.

[0016] Preferably, the second yarn is at least partially dyed with a fluorescent and / or phosphorescent dye in order to be used for the production of protective clothing that requires a corresponding visibility of the wearer of this protective clothing even in poor visibility conditions.

[0017] In a further embodiment of the invention, the fabric according to the invention comprises an additional, third yarn, which is preferably designed as a multifilament yarn. Para-aramid, for example, can be used as the third yarn. Such a fabric can thus be adapted, in particular, to customer-specific requirements.

[0018] The fabric according to the invention has a basis weight of 120 g / m² 2 up to 250 g / m² 2 , preferably of 160 g / m² 2 up to 220 g / m² 2It can be used in particular as the outer fabric of protective clothing. In a further embodiment of the invention, for fabrics according to the invention with a basis weight of less than 160 g / m². 2 These fabrics are applied to a membrane, preferably with a basis weight of 40 g / m². 2 up to 50 g / m² 2 , laminated.

[0019] The fabric according to the invention is particularly suitable for use as the outer fabric of protective clothing due to its properties, namely its good dyeability, high tear resistance, high abrasion resistance and UV resistance.

[0020] For the purposes of this disclosure, the term "outer fabric" refers to the layer of fabric located on the outside of the protective clothing, facing away from the wearer.

[0021] The protective clothing has an outer fabric made of a woven material consisting of at least two yarns, wherein a first yarn is selected from a group comprising flame-resistant fibers, in particular aramids, polyimides, polyamide-imides, polybenzimidazoles, poly(p-phenylene-2,6-benzobisoxazole), viscose FR and modacrylic, as well as mixtures thereof, and wherein at least one further, second yarn is provided, which is designed as a multifilament yarn, the filaments of which have a core made of a liquid crystal polymer (LCP), the core being surrounded by a sheath of a dyeable material that is chemically compatible with the core material. The core of the filaments made of VECTRAN is particularly preferred. ® manufactured and surrounded by a coating of polyethylene naphthalate (PEN).

[0022] The requirements for the outer fabric of protective clothing in terms of durability and wearing comfort necessitate a fabric weight of 120 g / m².2 up to 250 g / m² 2 , preferably of 160 g / m² 2 up to 220 g / m² 2 It is preferably provided that, if the fabric according to the invention has a basis weight of less than 160 g / m² 2 has the fabric on a membrane, preferably with a basis weight of 40 g / m² 2 up to 50 g / m² 2 , is laminated to provide the necessary stability.

[0023] Investigations by the applicant have shown that protective clothing with an outer fabric made with the fabric according to the invention, which has a basis weight that is usually referred to as a lightweight fabric, has the same or better tensile strength and tear resistance, although the basis weight of the outer fabric with the fabric according to the invention is 20% lower than outer fabrics made of a known PBI or aramid fabric.

[0024] With the same basis weight, the fabric according to the invention offers up to 90% improved tensile strength, up to 160% improved tear resistance, and up to 180% improved abrasion resistance compared to known fabrics.

[0025] Further investigations have shown that, particularly due to the outstanding UV resistance of the fabric according to the invention, these values ​​are maintained or only slightly reduced even over extended periods of wear, thus ensuring compliance with the legal requirements for protective clothing. Not only are the legal standards met, but in fact, tests under above-average UV exposure achieved an average improvement in tensile strength of approximately 70% and in tear resistance of over 75%.

[0026] This allows the production of particularly lightweight protective clothing that has high tear resistance and heat resistance while also offering high wearing comfort.

[0027] The invention will now be explained in more detail using non-limiting exemplary embodiments with accompanying figures. These show: Fig. 1 and Fig. 2 the fabric according to the invention with different plain weaves; Fig. 3 and Fig. 4 further embodiments of the fabric according to the invention with twill weave; and Fig. 5 another embodiment of the fabric according to the invention with Panama weave.

[0028] The fabric 100 according to the invention can be in different weaves.

[0029] Thus, in Fig. Figure 1 schematically shows a fabric 100 with a simple plain weave (L 1 / 1), wherein the warp threads 10 and the weft threads 20 are each alternately formed from a first yarn 101, a meta-aramid, and a second yarn 102 in the form of a multifilament yarn, the multifilament yarn consisting of filaments having a core of an aromatic polyester and a sheath of polyethylene naphthalate. In this embodiment of the invention, the second yarn 102 is a yarn designated VECTRAN MF (trademark of Kuraray Co., Ltd.).

[0030] The one in Fig. The fabric 100 shown has additionally reinforced ribs 103, which are also formed from VECTRAN MF threads 102 in both the weft and warp directions.

[0031] The yarn ratio of m-Aramid to VECTRAN MF is 7:2 in the warp direction and 6:2 in the weft direction.

[0032] In the Fig. Figure 2 again shows a fabric 100 with a plain weave, where the yarn ratio of m-aramid to VECTRAN MF is 13:2 in the warp direction and 12:2 in the weft direction. Reinforced ribs 103 made of VECTRAN MF are also provided here.

[0033] The Fig. 3 and Fig. Figure 4 shows tissue 100 with twill weaves (twill 2 / 1), wherein in the Fig. 3 the yarn ratio of m-aramid to VECTRAN MF is 7:2 in the warp direction and 7:2 in the weft direction, while in the Fig. 4. The thread ratio of m-aramid to VECTRAN MF is 16:2 in the warp direction and 13:2 in the weft direction. Reinforced ribs 103 made of VECTRAN MF are also provided for these fabrics 100.

[0034] The Fig. 5 describes a fabric 100 with Panama weave (P 2 / 1) with a yarn ratio of m-Aramid to VECTRAN MF in both the warp and weft directions of 10:2.

[0035] It is understood that the bonding described above is merely exemplary. The essential aspect of the invention is that a fabric with at least two yarns is present, wherein a first yarn comprises fire-resistant fibers and at least a second yarn is provided, which is designed as a multifilament yarn whose filaments have a core of a liquid crystal polymer (LCP), the core of the filaments being surrounded by a sheath of a dyeable material that is chemically compatible with the core material. In this way, a high-strength, flame-resistant fabric is obtained, which is particularly suitable for the production of protective clothing for firefighters. This fabric, preferably used as the outer fabric for protective clothing, can be dyed as desired, in particular uniformly.

[0036] In addition to uniformly dyed, especially single-color, fabrics, it can also be provided that the fabric has a main color, such as blue, gold, or red, and that additional stripes in a different color, especially a fluorescent or phosphorescent color, are woven into the fabric. In this way, an outer fabric for protective clothing is obtained in which yarns with fluorescent or phosphorescent properties are already woven in, resulting in a uniform fabric surface that is less susceptible to mechanical stress than an outer fabric to which the required reflective stripes are sewn. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2013 214 999 A1

[0004] EP 3 875 650 B1

[0006]

Claims

[1] Fabric (100) made from a first yarn (101) selected from a group containing flame-resistant fibers, in particular aramids, polyimides, polyamide-imides, polybenzimidazole, poly(p-phenylene-2,6-benzobisoxazole), viscose FR and modacrylic, and mixtures thereof, and wherein the fabric comprises at least one further, second yarn (102) containing fibers of a liquid crystal polymer (LCP), wherein the second yarn (102) is designed as a multifilament yarn, characterized by , that the filaments of the second yarn have a core made of a liquid crystal polymer (LCP), and wherein the core of the filaments is surrounded by a sheath made of a dyeable material that is chemically compatible with the core material. [2] Tissue (100) according to claim 1, characterized by , that the sheath of the filaments of the second yarn (102) contains at least one aromatic polyester, preferably polyethylene naphthalate (PEN). [3] Tissue (100) according to claim 1 or 2, characterized by that the core of the second yarn is made of another aromatic polyester, preferably VECTRAN ® , is educated. [4] Tissue (100) according to any one of claims 1 to 3, characterized by that the second yarn is at least partially dyed with a fluorescent and / or phosphorescent dye. [5] Tissue (100) according to any one of claims 1 to 4, characterized by an additional third yarn, preferably designed as a multifilament yarn. [6] Tissue (100) according to any one of claims 1 to 5, characterized by a basis weight of 120 g / m² 2 up to 250 g / m² 2 , preferably of 160 g / m² 2 up to 220 g / m² 2 . [7] Use of a fabric according to any one of claims 1 to 6 as the outer fabric of protective clothing. [8] Protective clothing with an outer fabric, wherein the outer fabric is made from a woven fabric of at least two yarns (101, 102), wherein a first yarn (101) is selected from a group comprising flame-resistant fibers, in particular aramids, polyimides, polyamide-imides, polybenzimidazoles, poly(p-phenylene-2,6-benzobisoxazole), viscose FR and modacrylic, as well as mixtures thereof, and wherein at least one further, second yarn (102) is provided which comprises fibers of a liquid crystal polymer (LCP), characterized by , that the second yarn (102) is designed as a multifilament yarn, the filaments of which have a core of a liquid crystal polymer (LCP), wherein the core of the filaments is surrounded by a sheath of a dyeable material chemically compatible with the core material, preferably polyethylene naphthalate (PEN). [9] Protective clothing according to claim 8, characterized bythat the core of the second yarn is made of an aromatic polyester, preferably VECTRAN ® consists. [10] Protective clothing according to claim 8 or 9, characterized by that the outer fabric has a basis weight of 120 g / m² 2 up to 250 g / m² 2 , preferably of 160 g / m² 2 up to 220 g / m² 2 exhibits. [11] Protective clothing according to claim 8 or 9, characterized by that the outer fabric is designed as a laminate in which a fabric according to one of claims 1 to 5 with a basis weight of less than 160 g / m² 2 on a membrane, preferably with a basis weight of 40 g / m² 2 up to 50 g / m² 2 , is laminated.

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