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CN-121992562-A - Flexible knitted fabric, composite fabric and production process

CN121992562ACN 121992562 ACN121992562 ACN 121992562ACN-121992562-A

Abstract

The invention discloses a flexible knitted fabric, a composite fabric and a production process, wherein the flexible knitted fabric is an all-plated yarn structure based on double ribs, the all-plated yarn structure comprises surface yarns and ground yarns, the surface yarns are made of ultra-high molecular weight polyethylene filaments or composite filaments, the ground yarns are made of heat-shrinkable filaments, and the fineness of the surface yarns is greater than or equal to that of the ground yarns. The invention integrally improves the resistance of the flexible knitted fabric to the penetration of the hypodermic needle.

Inventors

  • Request for anonymity
  • Request for anonymity
  • Request for anonymity

Assignees

  • 广东铠纳防护科技有限公司

Dates

Publication Date
20260508
Application Date
20260204

Claims (15)

  1. 1. A flexible knitted fabric is characterized by being an all-plated yarn structure based on double ribs, wherein the all-plated yarn structure comprises surface yarns and ground yarns, raw materials of the surface yarns are ultra-high molecular weight polyethylene filaments or composite filaments containing the ultra-high molecular weight polyethylene filaments, raw materials of the ground yarns are heat-shrinkable filaments, and fineness of the surface yarns is greater than or equal to fineness of the ground yarns.
  2. 2. The flexible knitted fabric according to claim 1, wherein the fineness of the ultra-high molecular weight polyethylene filaments or the composite filaments in the flexible knitted fabric is 100D to 400D, and the fineness of the heat shrinkable filaments is 50D to 200D.
  3. 3. The flexible knitted fabric according to claim 1, wherein the fineness of the ultra-high molecular weight polyethylene filaments or the composite filaments in the flexible knitted fabric is 100D to 300D, the fineness of the heat-shrinkable filaments is 50D to 150D, and the sum of the combined fineness of the face yarn and the ground yarn is 200D to 400D.
  4. 4. The flexible knitted fabric according to claim 1, wherein the weight percentage of the ultra-high molecular weight polyethylene filaments or the composite filaments in the flexible knitted fabric is 54-78 wt% and the weight percentage of the heat-shrinkable filaments is 22-46 wt%.
  5. 5. The flexible knit according to claim 1, wherein the square meter grammage of the flexible knit is 260g/m 2 ～561g/m 2 .
  6. 6. The flexible knitted fabric according to claim 1, wherein the ultra-high molecular weight polyethylene filaments comprise one or a combination of a plurality of high cut-preventing filaments and 100% ultra-high molecular weight polyethylene filaments containing micro-nano particles.
  7. 7. The flexible knitted fabric according to claim 1, wherein the composite yarn is a composite yarn formed from ultra-high molecular weight polyethylene filaments and one of polyester or polyurethane.
  8. 8. The flexible knitted fabric according to claim 1, wherein the heat shrinkable filament has a boiling water shrinkage of 2% to 4%.
  9. 9. The flexible knitted fabric according to claim 1, wherein the heat shrinkable filament is one of polyester filament, nylon filament, polypropylene filament, lyocell filament and viscose filament.
  10. 10. The flexible fabric of claim 1, wherein said veil is on both the front and back sides of said flexible fabric.
  11. 11. A process for producing a flexible knitted fabric according to any one of claims 1 to 10, comprising the steps of: Weaving all plating stitch structures based on double-rib knitting on a weft knitting double-sided knitting circular knitting machine, wherein ultra-high molecular weight polyethylene filaments or composite filaments containing ultra-high molecular weight polyethylene filaments are used as face yarns, heat-shrinkable filaments are used as ground yarns, the face yarns and the ground yarns are fed into the same knitting needle together, and knitting steps of yarn bending, looping and loop releasing are carried out to obtain blank cloth of a lower machine; during the braiding process, the yarn tension is adjusted to enable the ultra-high molecular weight polyethylene filaments to completely cover the heat-shrinkable filaments; And (5) applying a heat shrinkage finishing process to the blank of the lower machine to obtain the flexible knitted fabric.
  12. 12. The process for producing a flexible knitted fabric according to claim 11, wherein the face yarn and the ground yarn are fed to the same knitting needle together after being led out from the creel respectively, sequentially passing through the yarn guide tube, the yarn storage device and the yarn guide.
  13. 13. A flexible needling-resistant composite fabric is characterized by being formed by combining the flexible knitted fabric and a matrix composite phase according to any one of claims 1 to 10, wherein the matrix composite phase is resin or shear thickening fluid containing inorganic particles, the density ratio coefficient C of the fabric is less than or equal to 0.00028 x d+0.248, and D is more than or equal to 200D, wherein D is the sum of the comprehensive fineness of the face yarn and the ground yarn, and the density ratio coefficient C of the fabric is the ratio of the transverse density to the longitudinal density of the fabric.
  14. 14. The flexible needled-preventing composite fabric as claimed in claim 13, wherein the square meter gram weight of the flexible knitted fabric is 395g/m 2 ～561g/m 2 , and the mass fraction of the matrix composite phase in the composite fabric is 38% -43%.
  15. 15. A process for producing the flexible needled-preventing composite fabric as claimed in claim 13, which is characterized in that a matrix composite relatively flexible knitted fabric is adopted for infiltration treatment, excess liquid is extruded out, and finally the flexible needled-preventing composite fabric is obtained through drying.

Description

Flexible knitted fabric, composite fabric and production process Technical Field The invention relates to a flexible knitted fabric, in particular to a needling-resistant flexible knitted fabric, a composite fabric and a production process. Background The ultra-high molecular weight polyethylene fiber has the excellent characteristics of high specific strength, high specific modulus, good wear resistance, good chemical corrosion resistance and the like, and has great application potential in the field of high-end individual protective equipment, such as anti-cutting gloves, anti-stab clothing and the like. The preparation of fabrics from ultra-high molecular weight polyethylene filaments is an important way to achieve protection. At present, a technical scheme for directly weaving double-rib textures on a weft knitting double-sided circular knitting machine by adopting ultra-high molecular weight polyethylene filaments exists. However, this solution also has significant drawbacks. Because the ultra-high molecular weight polyethylene filaments have smooth surfaces, the coefficient of friction between the fibers is low. When the fabric is woven into a coil structure, the cohesion between the coils is poor, so that the fabric structure is relatively loose, and the overall compactness is insufficient. When the fabric is needled by a hypodermic needle, the smooth fiber bundle is easily pushed around by the penetrated needle tip, rather than being effectively held and resisted, and its resistance to the needling is poor. Second, the high modulus properties of ultra-high molecular weight polyethylene filaments give it high stiffness but poor flexural strength. In the weaving process, the ultra-high molecular weight polyethylene filaments can accelerate the abrasion of knitting needles and other looping parts, and can also influence the hand softness and comfort of the final fabric. In the fields of medical treatment, emergency rescue, public safety, etc., practitioners are often at risk of needle stick injuries. The hypodermic needle penetration action is similar to a very sharp and sharp cutter, has the dual functions of penetration and cutting, takes ASTM F2878 anti-hypodermic needle penetration as an evaluation standard, is different from cone penetration in the EN388:2016 standard, and has more severe performance requirements on protecting materials from tiny needle penetration. In the prior art, there have been proposals to improve the puncture resistance of fabrics by means of specific woven structures. As disclosed in US5837623, a protective fabric is provided that employs a high coverage, dense weave structure with a warp coverage of not less than 100% at the crossing of the fill yarns, and a warp curvature that is significantly higher than the fill yarn curvature, resulting in an interlocking "arch" structure of yarns at the interweaving points. The structure effectively limits the slippage of yarns in the puncturing process, distributes the puncturing force into a plurality of layers of fabrics, and resists the puncturing of sharp instruments through the cooperative action between the structure compactness and the layers. The protective fabric has extremely tight high coverage warp-weft density due to the adoption of a woven fabric structure with poor ductility, so that the hand feeling of the fabric is extremely stiff, multiple layers are required to be overlapped to achieve high protection level, the thickness and the weight of a finished product are further increased, and the use flexibility of the final product is greatly influenced. Another type of permeation resistant fabric is disclosed in U.S. patent No. 6962739B1, which discloses a multi-layer composite structure that provides cut and puncture resistance by providing an array of rigid plates on a flexible substrate. In order to achieve high needling resistance, multiple layers of the needle-punching-resistant protective material need to be staggered and overlapped, so that a penetration-resistant hard protective point is formed locally. Such lamination greatly sacrifices softness and flexibility of use, and is complex to process and longer to produce. At present, the anti-cone penetration in the EN388:2016 standard is mostly prepared by adopting high-performance fibers through a knitting process in the prior art. The knitted fabric has a structure in which yarns are bent into loops, and a yarn aggregate is connected in a longitudinal direction and a transverse direction. Structurally, the fabric has elasticity and ductility superior to those of woven fabrics, and can keep good softness under higher gram weight. However, such materials tend to deform under force, resulting in reduced protective ability. In the prior art, the double rib structure is adopted to improve the problems, the structure is compact, the stripes are clear, the elasticity and the ductility can be controlled to a certain extent, and meanwhile, the softness and the use flexibi