Apparatus, method and use of a composite tubular structure auxetic yarn

Abstract

A kind of processing device of composite tubular structure auxetic yarn, the fiber auxetic structure forming of different hollow tubular structure spinneret is implemented by cooperation of metering pump and spinning box;The sidewall of spinning duct is provided with first temperature regulating air bellow, and the auxetic particle with negative Poisson's ratio effect is exported, and the tow implanted with auxetic particle has shrinkage and auxetic effect;The coating spraying device sprays and coats the tow, and then is stably formed by the twisting and winding device;The processing method of the auxetic yarn includes: feeding raw material polymer by raw material feeding device, and spraying the tow by the spinneret of different hollow tubular structure under the cooperation of spinning box and metering pump, and then implanting auxetic particle into the tow by temperature regulating air bellow, and then spraying the coating on the tow by coating spraying device, and then twisting and winding by twisting and winding device.The present application has complete structure, and the composite tubular yarn structure is stable, the auxetic effect is good, and the mechanical property is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile materials, and particularly relates to a processing device, method and use of a composite tubular structure auxetic yarn. BACKGROUND

[0002] Auxetic material is a new type of material with excellent fracture toughness, shear stiffness, indentation resistance and energy absorption performance, which is different from most materials in nature. The material has a unique deformation mechanism of tensile expansion and compressive contraction. Based on the excellent physical and mechanical properties of auxetic material, the material has been favored by researchers in the field of textiles and related fields.

[0003] Auxetic material has good energy absorption performance and can be applied to protective clothing, protective equipment, protective hats, bulletproof vests, leg guards, knee pads or sheaths. The transmission of active medium by long fiber threads or yarns makes auxetic textiles become intelligent textiles due to their anti-inflammatory, deodorant and drug release capabilities, and auxetic textiles can improve the pressure comfort of clothing. Auxetic material used as paving material can significantly enhance the compression resistance and shock resistance. In the field of biomedicine, artificial auxetic blood vessels can enhance the response of blood vessel walls to blood pulsation and resist rupture. In the field of deep water operation in the ocean, auxetic polymer materials will show high hydraulic stability, and thus will have important applications in the field of national defense such as nuclear submarine manufacturing.

[0004] Currently, there are few studies on auxetic yarns. Although some patents WO2007 / 125352A1, CN2013103361811 and WO2010 / 146347A1 attempt to use two-component filament yarns to prepare negative Poisson's ratio filament yarns by adopting a spiral structure, this design mainly increases the apparent profile of the yarn by the relative movement of the inner and outer yarns during stretching, resulting in auxetic effect. However, the yarn manufactured by this design has a rigid outer layer, which greatly limits the transfer of the inner yarn. Filament yarns are prepared by adopting a spiral structure to prepare negative Poisson's ratio filament yarns. Patents US2011 / 0039088A1 and US2011 / 0209557A1 also describe several auxetic yarn structures similar to patent WO2007 / 125352A1. The main feature is that the filaments of the outer yarn and the core yarn as component yarns can cause the core yarn to bend and produce a negative Poisson's ratio effect according to environmental changes.

[0005] In summary, the above-mentioned method of processing auxetic yarn is mostly offline, which processes the tows into a spiral structure in the form of core-spun yarn or wrapped yarn, and then forms a stable structure through twisting. This spinning method is limited in yarn types and the resulting yarn is single in variety, which is relatively limited in terms of hand feeling of the fabric. By processing the tows during the spinning process, a tow yarn or filament yarn with a negative Poisson's ratio effect can be obtained, and the tows can be functionally modified. The processing flow is short, efficient, and flexible in post-processing and finishing. Therefore, it is necessary to develop a convenient and efficient method for making a negative Poisson's ratio yarn. SUMMARY

[0006] The purpose of the present application is to provide a processing device and method of composite tubular structure auxetic yarn and its use, which can conveniently and quickly make a composite tubular structure auxetic yarn with stable morphology and high negative Poisson's ratio effect, especially an in-line preparation of a filament yarn with a negative Poisson's ratio effect. The shaped product is suitable for functional and intelligent textiles, medical supplies, ordinary underwear, parachutes, thermal underwear, shoelaces, ropes, artificial ligaments, and home textile products.

[0007] A processing device of composite tubular structure auxetic yarn comprises a raw material feeding device, a coating spraying device, and a twisting and winding device, and further comprises a auxetic structure forming device between the raw material feeding device and the coating spraying device. The auxetic structure forming device is composed of a metering pump, a special-shaped hollow tubular structure spinneret, a first temperature adjusting air box, and a spinning duct. The special-shaped hollow tubular structure spinneret is used to form auxetic structure fibers in cooperation with the metering pump and the spinning box. The sidewall of the spinning duct is provided with a first temperature adjusting air box. The coating spraying device sprays and coats the tows coming out of the spinning duct, and the tows are cooled and shaped by a second temperature adjusting air box, and then twisted and wound by the twisting and winding device to form a stable structure of composite tubular structure auxetic yarn.

[0008] Preferably, the raw material feeding device of the present application delivers the polymer raw material to the extruder through a hopper, and the extruder changes the polymer raw material into a liquid with uniform structure and composition. The polymer raw material is a thermoplastic polymer or a thermosetting polymer. The thermoplastic polymer includes at least one of polyester, polypropylene, and polyamide. The thermosetting polymer includes phenolic resin or unsaturated polyester.

[0009] Preferably, the expansion structure forming device of the present application quantitatively delivers the liquid high polymer material extruded by the extruder through a metering pump, and sprays the filament bundle through a special hollow tubular structure spinneret; the special hollow tubular structure spinneret prepares the expansion structure filament bundle through the cooperation of the metering pump and the spinning box; the first temperature adjusting air box outputs the expansion particles with negative Poisson's ratio effect, and the expansion particles are implanted into the filament bundle sprayed by the special hollow tubular structure spinneret in the spinning channel through the first temperature adjusting air box, and the filament bundle with the implanted expansion particles has the effects of contraction and expansion.

[0010] Preferably, the expansion particles of the present application are structures with negative Poisson's ratio effect, including at least one of the following: concave hexagonal structure, triangular arrow structure, herringbone structure, star structure, and chiral honeycomb structure; the cross section of the expansion structure of the filament bundle contains the expansion particles and has an expansion form, which is at least one of the following: concave hexagonal structure, triangular arrow structure, herringbone structure, star structure, and chiral honeycomb structure.

[0011] Preferably, the coating spraying device of the present application comprises a spraying device and a second temperature adjusting air box; the spraying device can perform surface finishing of the filament bundle output by the spinning channel; the finishing agent is sprayed on the surface of the filament bundle to form a filament bundle with a smooth surface, and the smooth surface refers to that the variation coefficient of the apparent profile diameter of the filament bundle is not higher than 5%.

[0012] Preferably, the twisting and winding device of the present application has the functions of twisting and winding, and twists the filament bundle treated by the coating spraying device and winds it to form a composite tubular structure expansion yarn with a stable structure.

[0013] A processing method of a composite tubular structure expansion yarn, comprising the following steps:

[0014] a) feeding the high polymer material through a material feeding device, and conveying the high polymer material to an extruder through a hopper, wherein the extruder changes the high polymer material into a liquid with uniform structure and composition;

[0015] b) the liquid high polymer material is conveyed to a metering pump through the extruder, the metering pump controls and ensures that the high polymer material flows into the spinning box in a liquid state, and sprays the filament bundle through a special hollow ring spinneret;

[0016] c) the first temperature adjusting air box is set to a certain temperature, the expansion particles are conveyed into the filament bundle in the spinning channel to form a filament bundle with expansion effect;

[0017] d) adjusting the temperature of the second temperature adjusting air box, and the spraying device sprays and finishes the filament bundle in step c);

[0018] e) the yarns in step d) are twisted and wound to form auxetic yarns having a composite tubular structure.

[0019] Use of the composite tubular structure auxetic yarns as a rope, a shoelace, or as a yarn for a bandage medical product and an artificial ligament; or as a fabric yarn for a windproof jacket, a jacket, a home underwear.

[0020] The processing principle of the present application is to mix auxetic particles into a yarn by the basic way of spinning to realize the manufacturing of auxetic filament yarns with auxetic effect. Based on the flexibility of selection of auxetic particles, auxetic yarns with different auxetic effects can be manufactured; and different functional or intelligent auxetic particles can be selected to prepare yarn raw materials for functional textiles or intelligent textiles.

[0021] The present application has the characteristics and benefits that:

[0022] 1. By the way of melt spinning, auxetic particles are directly mixed into a yarn, and the yarn structure has good stability, overcoming the problems of yarn slippage on the structure surface, unstable structure, and insignificant auxetic effect of the existing spiral wrapping structure of auxetic yarn design and manufacturing.

[0023] 2. The selection range of auxetic particles is wide, and the styles are various. Most of the auxetic particles resistant to high temperature can be applied to the processing of the composite tubular auxetic yarn, and functional or intelligent or sensing auxetic particles can be selected to manufacture various long filament yarns with different auxetic effects, functionalization, and intelligentization.

[0024] 3. The auxetic yarn is cooled and shaped by a temperature-adjustable air box. Compared with the traditional auxetic yarn, the process of the present application is short, the yarn forming efficiency is high, and the spinning device structure is flexible. The processing method is simple, the adjustability is high, and the prepared yarn can meet the basic needs of functional textiles.

[0025] 4. The negative Poisson's ratio of the yarn is closely related to the selected auxetic particles. The negative Poisson's ratio and the auxetic effect of the auxetic yarn can be adjusted by selecting different auxetic particles. Higher negative Poisson's ratio, structural stability, and functional intelligent integrated auxetic yarns can be prepared, which can be directly applied to multiple fields and have good application prospects in the fields of functional clothing, composite materials, transportation, medical health, vibration damping and buffering, and filtering materials. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the processing device of the composite tubular structure auxetic yarn of the present application

[0027] Figure 2 is a schematic diagram of the state before and after stretching of the composite tubular structure auxetic yarn of the present application.

[0028] Figure 3 is a schematic view of a cross-section of the auxetic particle of the present application. DETAILED DESCRIPTION

[0029] The purpose of the present application is to provide a processing device and method of composite tubular structure auxetic yarn and its use, which can be conveniently and quickly made into composite tubular structure auxetic yarn with stable shape and high negative Poisson's ratio effect. The formed product is suitable for functional and intelligent textiles, medical supplies, ordinary underwear, parachutes, thermal clothing and home textile products, etc.

[0030] As shown in Figure 1 , a processing device of composite tubular structure auxetic yarn, comprising a raw material feeding device, a coating spraying device and a twisting and winding device, further comprising an auxetic structure forming device, the auxetic structure forming device is located between the raw material feeding device and the coating spraying device, and is composed of a metering pump, a special-shaped hollow tubular structure spinneret, a first temperature adjusting air box and a spinning duct; the special-shaped hollow tubular structure spinneret is used to form auxetic structure fibers by cooperating with the metering pump and the spinning box; the side wall of the spinning duct is provided with the first temperature adjusting air box; the first temperature adjusting air box outputs auxetic particles with negative Poisson's ratio effect; the auxetic particles are implanted into the filament bundle sprayed by the special-shaped hollow tubular structure spinneret, and the filament bundle with implanted auxetic particles has the effects of extrusion and auxesis; the coating spraying device sprays and coats the filament bundle, the second temperature adjusting air box cools and shapes the filament bundle, and then the twisting and winding device twists and winds to form a composite tubular structure auxetic yarn with stable structure.

[0031] The raw material feeding device delivers the polymer raw material to the extruder through the hopper, and the extruder changes the polymer raw material into a liquid with uniform structure and composition; the polymer raw material is a thermoplastic polymer or a thermosetting polymer; the thermoplastic polymer includes polyester, polypropylene, polyamide, PLA, etc.; the thermosetting polymer includes phenolic resin and unsaturated polyester, etc.

[0032] The auxetic structure forming device quantitatively delivers the liquid of the polymer raw material extruded by the extruder through the metering pump, and sprays the filament bundle through the special-shaped hollow tubular structure spinneret; the special-shaped hollow tubular structure spinneret prepares the auxetic structure filament bundle by cooperating with the metering pump and the spinning box; the first temperature adjusting air box outputs auxetic particles with negative Poisson's ratio effect, and the auxetic particles are implanted into the filament bundle sprayed by the special-shaped hollow tubular structure spinneret in the spinning duct through the first temperature adjusting air box, and the filament bundle with implanted auxetic particles has the effects of extrusion and auxesis.

[0033] As shown in Figure 3The present application is a kind of auxetic particles, which are structures with negative Poisson's ratio effect, including concave hexagonal structure, triangular arrow structure, herringbone structure, star structure, chiral honeycomb structure; the cross section of the auxetic structure of the filament bundle contains the auxetic particles and has an auxetic shape, which is a concave hexagonal structure, a triangular arrow structure, a herringbone structure, a star structure, and a chiral honeycomb structure. Figure 3 (a) is a concave hexagonal structure, Figure 3 (b) is a star structure, Figure 3 (c) is a triangular arrow structure.

[0034] The coating spraying device includes a spraying device and a second temperature adjusting air box; the spraying device can spray a surface finishing agent on the filament bundle output by the spinning channel; the finishing agent is sprayed on the surface of the filament bundle to form a filament bundle with a smooth surface, and the smooth surface refers to a variation coefficient of the apparent profile diameter of the filament bundle being not higher than 5%.

[0035] The coating spraying device is provided with a second temperature adjusting air box to cool and shape the filament bundle after being sprayed by the spraying device.

[0036] The twisting and winding device has the functions of twisting and winding, and can twist and wind the filament bundle treated by the coating spraying device to form a composite tubular structure auxetic yarn with a stable structure.

[0037] A processing method of a composite tubular structure auxetic yarn includes the following steps:

[0038] a) feeding a high polymer raw material through a raw material feeding device, and conveying the high polymer raw material to an extruder through a hopper, wherein the extruder changes the high polymer raw material into a liquid with uniform structure and composition;

[0039] b) conveying the liquid high polymer raw material to a metering pump through the extruder, and controlling and ensuring the metering pump to stably flow the high polymer raw material in a liquid state into a spinning box and be sprayed into a filament bundle through a special-shaped hollow ring-shaped spinneret;

[0040] c) setting the temperature of the first temperature adjusting air box to convey the auxetic particles into the filament bundle in the spinning channel to form a filament bundle with auxetic effect;

[0041] d) adjusting the temperature of the second temperature adjusting air box, and spraying the filament bundle in step c) by the spraying device;

[0042] e) twisting and winding the filament bundle in step d) to form an auxetic yarn with a composite tubular structure.

[0043] Applications of a composite tubular structure tensile yarn: the composite tubular structure tensile yarn can be used as ropes, shoelaces, and also as yarn for bandages, medical supplies, and artificial ligaments; and as yarn for fabrics such as windproof jackets, coats, and loungewear. Figure 2 This diagram shows the state of the composite tubular structure tension yarn before and after stretching according to the present invention, wherein... Figure 2 (a) is a schematic diagram of the state before stretching. Figure 2 (b) is a schematic diagram of the stretched state.

[0044] The present invention relates to a processing device and method for composite tubular structure stretchable yarn and its applications, specifically involving the following 5 embodiments: Embodiment 1: stretchable shoelaces; Embodiment 2: conductive stretchable yarn; Embodiment 3: artificial ligaments; Embodiment 4: stretchable seat belts for automobiles; Embodiment 5: stretchable hair ties.

[0045] Table 1

[0046]

[0047]

[0048] Table 1 describes the present invention. The corresponding parameter settings of the constituent components involved in each embodiment.

Claims

1. A processing device for composite tubular structure stretched yarn, characterized in that... The system includes a raw material feeding device, a coating layer spraying device, and a twisting and winding device. It also includes a tensile structure forming device located between the raw material feeding device and the coating layer spraying device. The tensile structure forming device consists of a metering pump, a shaped hollow tubular spinneret, a first temperature-regulating air box, and a spinning duct. The shaped hollow tubular spinneret, in conjunction with the metering pump and the spinning box, performs tensile structure fiber forming. The first temperature-regulating air box is installed on the side wall of the spinning duct. The coating layer spraying device coats the filaments exiting the spinning duct with a coating layer, and the second temperature-regulating air box cools and shapes the filaments. The filaments are then twisted and wound by the twisting and winding device to form a stable composite tubular tensile yarn. The aforementioned expansion structure forming device uses a metering pump to quantitatively deliver liquid polymer raw materials extruded from an extruder, and then ejects filament bundles through a shaped hollow tubular spinneret. The shaped hollow tubular spinneret, in conjunction with the metering pump and a spinning box, prepares expansion structure filament bundles. The first temperature-controlled air box outputs expansion particles with a negative Poisson's ratio effect. These expansion particles are implanted into the filament bundles ejected from the shaped hollow tubular spinneret within the spinning channel through the first temperature-controlled air box. The filament bundles with implanted expansion particles exhibit both compression and expansion effects. The coating layer spraying device includes a spraying device and a second temperature-controlled air box; the spraying device can spray a finishing agent onto the surface of the filament bundle output from the spinning tunnel; the finishing agent is sprayed onto the surface of the filament bundle to form a smooth filament bundle, and the smoothness of the surface means that the coefficient of variation of the diameter of the filament bundle's external outline is not higher than 5%.

2. The processing device for composite tubular structure stretched yarn according to claim 1, characterized in that: The raw material feeding device conveys the polymer raw material through a hopper to an extruder, which transforms the polymer raw material into a liquid with uniform structure and composition. The polymer raw material is a thermoplastic polymer or a thermosetting polymer. The thermoplastic polymer includes at least one of polyester, polypropylene, and nylon. The thermosetting polymer includes phenolic resin or unsaturated polyester.

3. The processing device for composite tubular structure stretched yarn according to claim 1, characterized in that: The tensile particles have a negative Poisson's ratio effect and include at least one of the following: a concave hexagonal structure, a triangular arrowhead structure, a herringbone structure, a star-shaped structure, and a chiral honeycomb structure; the cross-section of the tensile structure of the filament bundle contains the tensile particles and has a tensile morphology, wherein the tensile morphology is at least one of the following: a concave hexagonal structure, a triangular arrowhead structure, a herringbone structure, a star-shaped structure, and a chiral honeycomb structure.

4. The composite tubular structure yarn stretching processing device according to claim 1, characterized in that: The twisting and winding device has twisting and winding functions, twisting the filament bundles after the coating layer spraying device is processed, and winding them into a stable composite tubular structure tensile yarn.

5. A processing method based on the composite tubular structure stretched yarn processing device according to any one of claims 1-4, characterized in that, Includes the following steps: a) The polymer raw material is fed in through a raw material feeding device and transported to the extruder through a hopper. The extruder turns the polymer raw material into a liquid with uniform structure and composition. b) The liquid polymer raw material is transported to the metering pump through the extruder. The metering pump controls and ensures that the polymer raw material flows into the spinning box in a stable liquid state and is ejected into filament bundles through the irregularly shaped hollow annular spinneret. c) The first temperature-regulating air box is set to a certain temperature, and the stretching particles are transported into the filament bundle in the spinning channel to form a filament bundle with a stretching effect; d) Adjust the temperature of the second temperature-regulating air box, and the spraying equipment sprays and finishes the filament bundle in step c); e) The filament bundles in step d) are twisted and wound to form a stretched yarn with a composite tubular structure.

6. The use of a composite tubular structure stretched yarn obtained by the processing method of claim 5, characterized in that, The composite tubular structure tensile yarn is used as rope, shoelace, or as yarn for bandage medical supplies and artificial ligaments; or as fabric yarn for windproof jackets, coats, and home underwear.

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