CN105624902A - Anti-raveling knitted fabric and preparation method thereof - Google Patents

Abstract

The present invention provides an anti-loosening knitted fabric, which is a weft plain needle mesh structure fabric formed by mutually interlaced coils, wherein the coils are formed by overlapping polyolefin elastic yarn ground yarn and short fiber yarn/filament added yarn, so that the front side of the fabric is short fiber yarn/filament and the back side is polyolefin elastic yarn. The anti-loosening knitted fabric of the present invention, when knitting, the yarns are bent to form coils and interlaced with each other, and the contact parts of the coils interlaced with each other are bonded together by hot melting to form a fixed non-transferring mesh structure, when the yarn breaks somewhere, the yarn breaks and the coil loses its shape, but the unhooking will not occur again, and only a small hole that will not unloose is generated, so the product has stable size, reduced shrinkage, and reduced unloosening and curling.

Description

A kind of loosening-proof knitted fabric and preparation method thereof

technical field

The invention relates to the technical field of knitted fabric structure and preparation, in particular to a loosening-proof knitted fabric and a preparation method thereof.

Background technique

The weft knitted fabric in knitted fabrics, commonly known as single jersey, is widely used in the production of underwear, outerwear and socks because of its good elongation and comfort. But this fabric generally has a kind of defective, in prior art, still not well solved.

In the process of wearing, using or washing the above-mentioned fabrics, if a yarn is broken or the loop loses the interlocking connection, the loop will spread from the broken yarn along one or more wales under the action of its own internal force and external force. When it falls off, it will eventually be separated and disintegrated, which will seriously affect the appearance quality and inner quality of the fabric. Especially for stockings, the material is slender, the fabric structure is simple and thin, and it is easier to separate.

Therefore, under the condition of not damaging its outward appearance or structural extensibility and retractability, it is very necessary to study and avoid yarn breakage without falling apart. Huge promotional value and market prospect.

Contents of the invention

In order to solve the problems existing in the current plain knitted fabric, the present invention provides a novel structure and preparation method of a comfortable fabric with anti-loosening, free-cutting and high elasticity. The preparation method is suitable for developing all-wool elastic fabrics, silk spun silk fabrics, mercerized cotton fabrics, tailor-made underwear fabrics and non-falling socks. Its specific technical scheme is as follows:

An anti-scattering knitted fabric, which is a weft plain stitch net structure fabric formed by loops passing through each other, wherein the loops are overlapped by plating of polyolefin elastic silk ground yarn and short fiber yarn/filament Made so that the face of the fabric is staple fiber yarn/filament and the reverse side is polyolefin elastic yarn.

Further, the contact points of the coils passing through each other are melted and bonded to each other.

A kind of preparation method of anti-scattering knitted fabric, it comprises the following steps:

Step 1: raw material selection, the raw materials include:

Ground yarn: polyolefin elastic yarn;

Plating: staple fiber yarn/filament;

Step 2: Fabric Weaving:

The prepared ground yarn and plating yarn are formed into circles by circular knitting machine, and then woven into semi-finished fabrics;

Step 3: Fabric heat setting:

The semi-finished fabric is subjected to hot-melt and shaping treatment, the hot-melt temperature is 110°C, and the time is controlled at 20-40S. The contact parts where the coils pass through each other are bonded together due to heat melting, forming a fixed non-transfer network structure.

As a preferred solution, in step 2, the yarn feeding mechanism of the strip-type wheel-shaped yarn guide is used to feed and plate the polyolefin elastic yarn and staple fiber yarn/filament, and the yarn feeding tension of the polyolefin elastic yarn is controlled at 6-8CN, the tension of the plating of staple fiber yarn/filament is 3-5CN, and the ratio of yarn feeding and plating is less than 1:2.

Further, in step 2, when weaving, control the position of the yarn guide so that the longitudinal angle of the lapping yarn of the staple fiber yarn/long filament is greater than the longitudinal angle of the lapping yarn of the polyolefin fiber, and the transverse angle of the lapping yarn is smaller than the transverse angle of the lapping yarn of the polyolefin fiber. horn.

Further, in the third step, the fabric is heat-set by using a pin stenter setting machine, and when the setting width parameter is selected, the setting width parameter is 5-15% larger than the width of the final product.

The anti-loosening knitted fabric and its preparation method provided by the present invention have the following advantages:

An anti-loosening knitted fabric of the present invention is woven from polyolefin elastic yarn and short fiber yarn/filament material. During weaving, the yarn is bent to form loops and put on each other, and the contact parts where the loops put on each other are heated Melt and bond together to form a fixed non-transfer network structure. When the yarn breaks somewhere, the broken yarn coil loses its shape, but the sheathing will not happen again, just a small hole that will not come off. Therefore, the size of the product is stable, the shrinkage rate is reduced, and the phenomenon of falling off and curling is reduced.

Description of drawings

Fig. 1 is the structure diagram before bonding of a kind of anti-loosening knitted fabric of the present invention;

Fig. 2 is a schematic diagram of the bonded structure of a loosening-proof knitted fabric according to the present invention.

detailed description

In the following, a further detailed description will be given of the anti-scattering knitted fabric and its preparation method in conjunction with the examples.

Traditional weft jersey fabrics are made of loops formed by bending yarns and looping through each other. Relying on the elastic deformation of the coil bending to maintain its shape, if the yarn breaks somewhere in the fabric, the coil loses its shape and falls off, and disintegrates and loosens from the broken yarn along the wale. If the contact points where the coils are sheathed are glued together, the yarn breaks and the coils lose their shape, but the sheathing will not happen again, and only a small hole that will not come off will be produced.

The design idea of the present invention is based on this, as shown in Figure 1, a kind of anti-loosening knitted fabric of the present invention, it is the weft stitch mesh structure fabric that is formed by the coil that intertwines each other, and wherein, described coil is made of Polyolefin elastic silk ground yarn and staple fiber yarn/filament are overlapped, so that the front side of the fabric is staple fiber yarn/filament, and the reverse side is polyolefin elastic yarn. The contact points of the mutually threaded coils are melted and bonded to each other.

Polyolefin elastic fiber is a high-elastic filament made by mixing two olefin copolymers with different melting points. After stretching at a constant elongation of 300%, the elastic recovery rate reaches more than 90%. According to the DSC thermal performance analysis, it is found that the material has The two peak melting points are 110°C and 160°C respectively. Therefore, when the heat setting temperature is maintained at about 110°C, the fibers are partially melted, and the contact points are bonded together, and the heat setting rate reaches 100% shape retention. Therefore, the weft-knitted fabric formed by crossing each other with thermoplastic polyolefin elastic fibers is heat-set at 110°C, and the connection points of the loops are fixed to form an elastic network structure without fiber transfer.

However, experiments have shown that it is not feasible to weave products with polyolefin elastic fibers alone, and must be woven together with traditional staple fiber yarns or filaments. Therefore, the structure of the fabric is a full-plated structure. All the loops in the fabric are formed by overlapping the two yarns of staple fiber yarn or filament plating and polyolefin elastic silk ground yarn, and have a covering relationship. The staple fiber yarn or filament is on the front of the fabric, and the polyolefin elastic filament On the wrong side of the fabric.

The specific preparation process is as follows: Polyolefin elastic yarn has large elongation and friction characteristics, so the yarn feeding mechanism of strip type wheel-shaped yarn guide is used, the yarn feeding tension is controlled at 6-8CN, and the tension of plating In 3～5CN, the ratio of yarn feeding amount to yarn feeding and plating is controlled in the range of 1:2. When weaving, select the position of the yarn guide so that the longitudinal angle of the plated yarn is larger than that of the polyolefin fiber, and the transverse angle is smaller than that of the polyolefin fiber, thus ensuring the configuration relationship of the two yarns. The prepared ground yarn and plated yarn are formed into circles by circular knitting machines, and then woven into semi-finished fabrics.

After the semi-finished fabric is fully relaxed to eliminate the residual stress inside the fabric, heat setting treatment can make the fabric size stable, reduce the shrinkage rate, and also eliminate defects such as wrinkles, rope wrinkles and thin roads. The following heat setting process is determined through experiments. A pin stenter setting machine is used. The heat setting temperature is set at about 110°C, the first melting point of thermoplastic polyolefin elastic fibers, and the time is controlled at about 20 to 40 seconds. At the same time, it should be considered that the fabric will shrink a little after setting, so the setting width should be about 5-15% larger than the final product width. After heat-melting and shaping treatment, the contact parts where the coils pass through each other are bonded together due to heating and melting, forming a fixed and non-transferring network structure, so the dimensional stability of the product is improved, the shrinkage rate is reduced, and the phenomenon of loosening and curling is reduced. . as shown in picture 2.

Example 1:

In this embodiment, the raw materials are 9.72tex hemp yarn (98% cotton/2% polyester) and 4.44tex polyolefin elastic yarn;

The knitting machine adopts a 24-pin/inch single-jersey circular knitting machine and a yarn-feeding mechanism with a strip-type wheel-shaped yarn guide;

According to the characteristics of raw materials, adjust the yarn feeding tension of polyolefin elastic yarn to 7CN, and the plating tension of hemp ash yarn to 4CN. Yarn position to ensure configuration relationship; in the heat setting process of finishing, consider the control requirements of polyolefin yarn on setting temperature, control parameters such as temperature, width and number of cars: temperature 110 ℃, speed 18 ~ 20m/min.

The performance of the final product: the weight is 145g/㎡, the transverse shrinkage is 0.8%, the longitudinal shrinkage is 5%, the elastic recovery rate is over 95% when the elongation is 80%, and the anti-curling of the fabric is improved. There is almost no loosening of rows, and yarn breakage occurs, only a small hole is produced in the fabric, and no sheathing occurs. Using this fabric to make underwear products, the neckline is laser cut without piping or wrapping, which improves production efficiency and wearing performance.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Claims (6)

1. An anti-scattering knitted fabric is characterized in that: it is a weft flat stitch mesh structure fabric formed by loops that go through each other, wherein the loops are made of polyolefin elastic silk ground yarn and short fiber yarn/ The plating of filaments overlaps so that the fabric has staple yarns/filaments on the front side and polyolefin elastane on the reverse side. 2. The loosening-preventing knitted fabric according to claim 1, characterized in that: the contact points of the intertwined loops are melted and bonded to each other. 3. A preparation method of an anti-scattering knitted fabric, characterized in that: it comprises the following steps: Step 1: raw material selection, the raw materials include: Ground yarn: polyolefin elastic yarn; Plating: staple fiber yarn/filament; Step 2: Fabric Weaving: The prepared ground yarn and plating yarn are formed into circles by circular knitting machine, and then woven into semi-finished fabrics; Step 3: Fabric heat setting: The semi-finished fabric is subjected to hot-melt and shaping treatment, the hot-melt temperature is 110°C, and the time is controlled at 20-40S. The contact parts where the coils pass through each other are bonded together due to heat melting, forming a fixed non-transfer network structure. 4. the preparation method of a kind of anti-loosening knitted fabric according to claim 3 is characterized in that: in step 2, adopt the yarn feeding mechanism of strip-type wheel-shaped yarn guide, to polyolefin elastic yarn and staple fiber The yarn/filament is fed and plated, the tension of the polyolefin elastic yarn is controlled at 6-8CN, the tension of the staple fiber yarn/filament is 3-5CN, and the ratio of the amount of yarn fed to the plated yarn is Less than 1:2. 5. The preparation method of a kind of anti-scattering knitted fabric according to claim 3, characterized in that: in step 2, when weaving, the position of the yarn guide is controlled so that the longitudinal angle of the lapped yarn of the staple fiber yarn/filament is greater than The longitudinal angle of the lapping yarn of the polyolefin fiber is smaller than that of the lapping yarn of the polyolefin fiber. 6. The preparation method of a kind of anti-scattering knitted fabric according to claim 3, characterized in that: in step 3, a needle board tenter setting machine is used to heat-set the fabric, and when the setting width parameter is selected, the setting width The width parameter is 5-15% larger than the width of the final product.