DE202013004183U1 - Yarn and its use for protective equipment - Google Patents

Abstract

Flame-retardant, non-thermoplastic yarn, characterized in that it is formed as a core-spun yarn whose core comprises or consists of a cellulosic multifilament having a tensile strength of greater than 28 cN / tex, in particular greater than 32 cN / tex, this Multifilament preferably has an LOI of less than 25, more preferably less than 22, and in particular less than 19.

Description

The invention relates to a flame-retardant, non-thermoplastic yarn which comprises, and in particular consists of, regenerated cellulosic regenerated fibers by a spinning process, in particular wet-spinning, of viscose, and which has flame retardant properties caused by a pigment entrained in at least part of its cellulosic regenerating fibers, wherein the yarn preferably has a strength conditioned of at least 18 cN / tex and a wet strength of at least 11 cN / tex.

Permanent flame retardant cellulosic yarns have been known in the art for about 40 years and are used in particular for improving the wearing comfort in protective fabrics (PPE (Personal Protective Equipment)). Due to their chemical similarity to cotton, cellulosic regenerated fibers are distinguished from synthetic fibers by an increased moisture absorption or significantly higher water retention capacity. Furthermore, as a non-thermoplastic material, cellulose does not tend to deform, melt or increase in adhesion, even at elevated temperatures.

The term "flame retardant", in the first place, generally includes resistance to flame exposure and, more particularly, includes resistance to flame exposure in that, upon removal of the applied flame, combustion is no longer promoted. This corresponds to about an LOI of 24 or higher. A permanent flame retardant effect on regenerated cellulosic fibers is generally achieved by adding water insoluble pigments or additives prior to spinning in a spin dyeing related technique to viscose or cellulose directly dissolved in NMMO or ionic liquids. In the case of the pigments or additives, phosphorus-containing compounds and polymers, silicic acid derivatives or, more recently, also carboxymethylcellulose derivatives are usually used.

In many cases it is currently in the commercially used regenerated staple fibers, which were sold under the brand name Danusil ^® CS or Lenzing FR ^® or be. Other fibers of wool and / or high-temperature resistant synthesis staple fibers in the form of intimate mixtures can be combined with these staple fibers. Ideally, the properties of the individual fibers can be synergistically combined in this way. The widespread use of these intimate blends in the PPE sector as well as even more cost-effective cotton yarns, which must be retrofitted, has led to the end user in the industrial sector, such as welders, blast furnace workers, but also firefighters with regard to the haptic perception of textile fabrics, the Professional speaks here of the "grip" or "goods grip", per se on an experience based expectations of the day. This includes not only the handle but also the visual appearance. Glossy or light-reflecting textiles are often associated with the thermoplastic polyester, a material that melts in spite of permanent flame retardancy under heat and can cause serious injury in contact with the skin.

In addition to cotton-like moisture management, another way to increase comfort is to reduce the weight of the fabric. In order to realize lighter fabrics, in addition to constructive measures, such as 3D constructions, especially finer yarns are required. However, these must inevitably have a higher specific strength than staple fiber yarns usually have, so that the weight-reduced textiles produced therefrom meet the mechanical requirements, for example according to ISO EN 11612 fulfill. One way to achieve this goal with novel permanent flame-retardant cellulosic multifilament yarns was described in the 2012 Lenzinger reports. By using these multifilaments, more than 20% lighter fabrics, with the same strength can be compared to conventional staple fiber yarns of the same construction.

Despite the achieved with these products marketed under the brand name Viscont ^® FR yarns advantages in terms of reduced basis weight and increased comfort has been found, however, that made therefrom fabrics for protection in the industrial sector a partial unsatisfactory because have to smooth fabric hand. This smooth fabric handle primarily results from the filament with respect to the Stapelfasergarn non-existent hairiness. The hairiness can be recordable over the hairiness index H to mangold and pot express. For staple yarns, this value is over 200, while for filaments this is at or around zero.

Furthermore, the permanently flame retardant multifilament and 100% fabric made therefrom have a gloss not unlike that of polyester yarns or polyester fabrics. This effect can lead to undesirable associations with end customers for thermoplastic fabrics and crochets unsuitable for this purpose.

As a related improvement, it has also been proposed to realize taslang yarns from the permanent flame retardant multifilament yarns. The problem, however, is the strength loss due to this technology during taslanization. The strengths cond. are only about 15 cN / tex and thus in the order of staple fiber yarns although the desired effect in terms of "textile" grip and reduced gloss could be achieved.

Because of these problems, the invention has for its object to provide a cellulosic yarn from which textile fabrics can be produced, in particular in the field of protective clothing, which are based on the one hand with respect to the haptic and optical properties of the above considerations and on the other hand improved in terms of tensile strength ,

The object is achieved by the invention surprisingly simply by providing a yarn of the type mentioned, which is characterized essentially in that it is a core-spun yarn (yarn having the structure of a surrounded by a wrapping soul), in which a cellulosic multifilament having a strength greater than 28 cN / tex, more preferably greater than 32 cN / tex, is used as the core. Preferably, this can make up to 50% of the total mass of the yarn and it preferably has an LOI of less than 25, more preferably less than 22, and in particular less than 19. The core may be wound with permanently flame-retardant, cellulosic staple fibers having a length of less than 90 mm, particularly preferably from 40 to 50 mm in length and optionally other fibers.

The production of core spun yarns per se is known to the person skilled in the art. It can be carried out on suitable commercially available machines.

The co-spun flame retardant could be added in the form of a particulate solid to the dope as a dispersion. Preferably, a phosphorus-containing flame retardant is used, in particular 2,2'-oxybis [5,5-dimethyl-1,3,2-dioxaphosphorinane] 2,2 'disulphide, also known under the trade name Exolit or Sandoflam, since these fibers are common Equip methods and dye in the bath. In this case, a phosphorus content based on the cellulose in the range of 2.5% or higher, preferably 2.8% or higher, more preferably 3.2% or higher, or even higher than 3.5% is desired.

Surprisingly, despite the reduction in flame retardant based on the total weight of the core spun yarn to below 15 wt.%, A non-melting, cellulosic yarn having an LOI greater than 24, in particular greater than or equal 25 and thus referred to as permanently flame retardant can be.

In a practical embodiment of the invention, the high-strength cellulosic multifilament used for the core is spun according to the modal method known per se. The Kapillartiter is preferably between 0.4 and 5 dtex, more preferably between 1.7 and 3.0 dtex. As the titer of the single yarn for the core, it is preferred that this be less than 440 dtex, particularly preferably less than 220 dtex, in particular less than 180 dtex. The conditioned tensile strength is at least 28 cN / tex, preferably above 32 cN / tex.

As Kapillartiter the cellulosic, permanently flame-retardant staple fibers is preferred that they are below 5.5 dtex, more preferably below 3.3 dtex and the length of the staple fibers is less than 90 mm, more preferably between 40 and 50 mm. Within the scope of the invention, in particular up to 20% by weight, more preferably only up to 10% by weight, of modacrylic, modal or tenc fibers prior to spinning can be added to the permanent, flame-retardant staple fibers. As a result, the grip and the water retention capacity of the core spun yarn can be influenced according to the end customer needs. In a specific embodiment, the use of cellulosic staple fibers is provided with respect to modal fibers reduced water absorption.

The inventive yarn may also contain up to 2% by weight of antistatic fibers.

From the yarn according to the invention, a textile fabric can be produced such that it is formed predominantly or purely from this yarn. As well as mixtures with other types of yarn can be used, preferably ^® high temperature resistant synthetic fibers such as aramids (Nomex or Conex ^®), PBI ^® or KERMEL ^®. It may be a fabric, wherein the yarn of the invention is also used as a warp yarn. On the other hand, the fabric could also be a knitwear.

The textile fabric preferably has a weight per unit area of 400 g / m ² or less, preferably 300 g / m ² or less, and in particular of 250 g / m ² or less. As a result, a good wearing comfort can be achieved with satisfactory performance properties.

When the fabric is a fabric, it is not limited in the nature of its construction. For example, twill weaves of different types, but also plain weaves, satin ribs, or jacquard weaves could be used.

With regard to the usability, it is further preferred if the textile fabrics have a rub resistance of at least 40,000 turns, preferably at least 50,000 turns under load of 12 kPa (measured according to Martindale EN ISO12947-1,2 ).

The fabrics and knits made with the yarn of the invention can, as already explained, for clothing in the PPE area, for example, clothing for people in foundries, blast furnaces, petroleum industry and other occupational groups, but especially fire and military, with high risk of thermal impact be used.

In addition to textile fabrics, the applications of the yarn according to the invention also include cords, ropes and ropes as well as the use as a monofilament.

Further features, details and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying figures, wherein 1 shows the cross section of an inventive yarn.

In Table 1, an inventive Core-Spun yarn with Viscont ^® FR multifilament and viscose FR stacking yarn are first compared by way of example. Clearly visible are the compared to the staple fiber yarn significantly increased tensile strengths of the inventive yarn, and a comparable Haarigkeitsindex H. yarn Titre [dtex] Tensile strength [cN / tex] Elongation at break [%] Tensile strength wet [cN / tex] Elongation at break wet [%] Coefficient of friction [μ] Index H Viscont FR 200 dtex PS, S500 223 27.0 17.4 17.3 29.9 0.20 0.0 Viscont HT / Viscose FR 350 dtex 352 20.6 12.0 12.0 14.9 0.24 221 Viscose FR stack 200 dtex 204 13.4 16.3 11.6 22.5 0.23 218

Material construction:

Core spun 350 dtex Soul: Viscont ^® HT dtex 67 f38 S90 glz. Umspinnungsfaser: Viscose FR 51 mm dtex 2.2

The soul is wound with the fiber. The material mix is 20% soul, 80% fiber.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• ISO EN 11612 [0005]
• EN ISO12947-1,2 [0020]

Claims (10)

Flame-retardant, non-thermoplastic yarn, characterized in that it is formed as a core-spun yarn whose core comprises or consists of a cellulosic multifilament having a tensile strength of greater than 28 cN / tex, in particular greater than 32 cN / tex, this Multifilament preferably has an LOI of less than 25, more preferably less than 22, and in particular less than 19. Yarn according to protection Claim 1, characterized in that it has an LOI of greater than or equal to 24, particularly preferably greater than or equal to 25. Yarn according to one of the claims 1 to 2, characterized in that the wrapping of the core staple fibers having a maximum length of 90 mm, preferably in the range of 40 to 60 mm and a Kapillartiters of less than 5.5 dtex, preferably of less than 3.3 dtex having. Yarn according to one of the claims 1 to 3, characterized in that it has a tensile strength of at least 18 cN / tex and a tensile strength wet of at least 11 cN / tex. Yarn according to protection claim 3 or 4, characterized in that the staple fibers are formed cellulosic and permanently flame retardant. Yarn according to one of the claims 1 to 5, characterized in that the wrapping of the core in addition to the particular flame retardant staple fibers up to 20 wt.%, Particularly preferably up to 10 wt.% Of the total staple fiber weight fibers of the type Modacryl, Modal, Tencel or hydrophobic Has fibers. Yarn according to one of the claims 1 to 6, characterized in that the wraparound of the core in addition to the particular permanent flame retardant staple fibers up to 2 wt.% Antistatic fibers which were added before the core spun spinning. Yarn according to one of the claims 1 to 7, characterized in that the Haarigkeitsindex to Mangold and pot of the yarn 150, preferably 180, more preferably 200 does not fall below. Textile fabric comprising a yarn according to any one of claims 1 to 8. Use of a yarn according to one of the claims 1 to 8 or a textile fabric according to protection claim 9 for the production of protective clothing and / or protective equipment.

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