JPS6235501B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a knitted fabric with good water absorption. Conventional methods for imparting water absorbency to knitted fabrics include: using water-absorbing fibers, imparting water-absorbing properties to fibers through chemical processing, and creating micropores in fibers physically or chemically. Although some methods have been developed and are in use, they are not fully satisfactory because they have problems in terms of comfort when worn, quick drying properties, durability against washing, and the like. In other words, water absorbency and quick-drying properties are contradictory properties; some fibers, like cotton fibers, have excellent water-absorbing properties but are poor in quick-drying properties, while others, like general synthetic fibers, have excellent quick-drying properties. However, some have poor water absorbency, but all have poor wearing comfort. Cotton fibers have the disadvantage of becoming sticky due to wetness due to poor quick-drying properties when the amount of perspiration increases per unit time, while general synthetic fibers have the same disadvantage of lacking a cool feeling when sweating and becoming sticky due to wetness due to poor water absorption. have. Furthermore, in order to solve this problem, we have developed a layered knitted fabric using hydrophilic fibers such as natural fibers on one side and hydrophobic fibers such as polyester on the other side. is proposed. However, since these layered knitted fabrics use natural fibers, etc., they do not dry quickly, and after absorbing enough sweat, the knitted fabric itself becomes heavy and its resilience is impaired. Therefore, the feeling of wearing becomes poor, and
Due to its poor quick-drying properties, it has the disadvantage that it becomes sticky due to wetness when there is a lot of perspiration, and it also dries slowly. An object of the present invention is to improve the above-mentioned drawbacks and provide a knitted fabric that has a cotton-like feel, excellent water absorption and quick drying properties. That is, in the present invention, one surface of the knitted fabric is composed of a synthetic fiber double-dwelling yarn having a nearly core-sheath multilayer structure with fused portions interspersed therein, and the other surface is composed of a synthetic fiber multifilament yarn and/or A knitted fabric with a two-layer structure composed of long fiber yarns made of crimped synthetic fiber multifilament yarns, in which the single fiber fineness of the filaments forming the outermost layer of the synthetic fiber composite yarn is The average fiber density coefficient of the stitches forming the layer of the synthetic fiber composite yarn in the two-layer structure knitted fabric is smaller than the single yarn fineness of the filaments constituting the fiber yarn, and the average fiber density coefficient of the stitches forming the layer of the synthetic fiber composite yarn in the two-layer structure knitted fabric is The water-absorbing knitted fabric is characterized by having a larger water-absorbing capacity, and furthermore, the knitted surface made of the long fiber yarn is subjected to a hydrophilic treatment, thereby further improving the water-absorbing property. The present invention will be explained in detail below. The knitted fabric of the present invention has a two-layer structure on the front side and the back side, and has a so-called knotted structure in which an intermediate layer is formed by tuck knitting between the front side and the back side. A reversible structure or the like is preferably used, and a pile knitted fabric is also preferably used. Furthermore, the knitted fabric may have a bonded structure in which the knitted fabrics are combined together, but the front side and the back side are bonded with dorsal-ventral two-layers by adhesive or other means to prevent layer separation.
It is necessary to have a layered structure. In the present invention, one side of the knitted fabric having such a two-layer structure (i.e., one layer of the two-layer structure knitted fabric)
Synthetic fiber composite yarn having a nearly core-sheath multilayer structure with interspersed fused parts (hereinafter simply referred to as composite yarn)
It is composed of: That is, the fused portions are generated by heat treatment, etc., and the fused portions are distributed in a dispersed manner, and due to the dispersed distribution, the constituent fibers of the entire composite yarn are appropriately fused, resulting in a three-dimensional fused distribution structure. It is desirable that the Further, the composite yarn must have a core-sheath multilayer structure, and for example, a yarn having a three-layer core-sheath structure as shown below is effectively used.
In other words, it is a false twisted composite yarn in which sheath yarns made of multifilament yarns are wound around a core yarn with a yarn length difference of 15% or more. The filament threads are wound in a substantially converged manner around the core yarn in a continuous inverted alternate twist, and the winding interface is at least partially fixed due to the fusion of the core yarn, while the remaining filament yarns separate individually and are not wound. It is wrapped in a contracted state. Furthermore, specifically, such a composite yarn has a higher thermal fusing temperature than the thermoplastic synthetic fiber 1 that is being false twisted, and has a relatively small single yarn fineness. For example, a multifilament yarn 3 made of ultrafine single fibers of approximately 2 de or less and 40 or more fibers is wound under the overfeed, and in this state, the yarn 1 that substantially forms the core is partially fused. At the same time, heat fixing is performed while fixing at least a part of 3 which is in contact with 1 at the interface by fusing 1, and further, by winding both yarns 1 and 3 without separating them after untwisting. It is preferable that there is a yarn length difference of 15% or more between the core yarn and sheath yarn of the composite yarn from the viewpoint of the appearance of the core-sheath structure, and a more preferable texture and appearance is obtained when the difference is 25% or more. It will be done. When the yarn length difference is 40 to 70%, a slight excess yarn length occurs and fine noils (uneven thickness) are present, but it is preferable because it has a natural cotton fiber appearance. However, when it exceeds 70%, there are obvious nets and slabs, and it becomes fanciful. Next, an example of the composite yarn used in the knitted fabric of the present invention will be explained in more detail with reference to the drawings. Figure 1 is a model diagram of a typical yarn side structure of the composite yarn, and Figure 2 is a cross-sectional view of the yarn. It is a model diagram of the structure. The core yarn 1 is partially fused and has no elasticity, and the part 2 of the sheath yarn is at least partially fixed at the interface with the core yarn due to partial fusion of the core yarn, and moreover, in the S direction and the Z direction. The filament yarns 3 of the sheath yarn are individually separated and wound in a crimped state. It has a unique structure. In other words, the high-density sheath yarn structure that is wound continuously in the S and Z directions exhibits excellent water retention performance, and the partial fusion allows the fusion points to be dispersed and distributed, creating a three-dimensional fusion distribution structure. Therefore, such a fused distribution structure exhibits excellent water retention performance. In addition, in order to improve water retention performance, it is preferable that the single yarn fineness of the sheath yarn is thinner, and by setting it to 2 denier or less, more preferably 1 denier or less, in addition to water retention performance, a cotton-like texture can be imparted. I can do it. On the other hand, on the other side of the two-layer knitted fabric, a long fiber yarn consisting of a synthetic fiber multifilament yarn and/or a synthetic fiber multifilament crimped yarn is used. Effective methods of crimping include false twisting and fluid jetting. Further, when comparing the single yarn fineness of the filaments constituting the long fiber yarn with the single yarn fineness of the filaments mainly forming the outermost layer of the composite yarn, the single yarn fineness of the outermost layer filament is smaller. In addition, it is necessary that the average fiber density coefficient of the stitches forming the layer of the composite yarn in the two-layer knitted fabric be larger than that of the layer of the long fiber yarn. Here, when the average fiber density coefficient of the stitches forming a layer of composite yarn is high, it means that the average fiber density of the composite yarn itself is high, and also that the structure of the layer of the knitted fabric is made of long fiber yarns. This includes cases where the texture is denser than that of strips, and as a result, the average fiber density coefficient of the stitches is large. The average fiber density coefficient of a stitch is the product of the number of fibers included in each stitch constituting each layer of the knitted fabric, the fiber length, and the square root of the single yarn fineness, that is, it is calculated by the following formula. However, M = average fiber density coefficient of unit stitches constituting one layer li = loop length of unit stitch fi = number of single fibers constituting the stitch di = fineness of single fiber ki = 1 stitch in complete structure Number i = 1 yarn feeding number of complete structure The above-mentioned composite yarn and long fiber yarn used in the knitted fabric of the present invention may be made of the same type of synthetic fibers, or may be made of different types of synthetic fibers. It can be anything. In addition, the types of synthetic fibers used include polyamide fibers, acrylonitrile fibers, polyester fibers, etc. When it is desired to emphasize the feel of cotton lighter due to the fused portion, it is preferable to use polyester fibers. The knitted fabric of the present invention obtained with the above-described configuration is a novel knitted fabric that can be imparted with water absorbency without reducing the quick-drying characteristic of synthetic fibers. That is, as mentioned above, the composite yarn used in the knitted fabric of the present invention has a core-sheath structure and a three-dimensional fused structure, and has superior water retention performance compared to general long fiber yarns. Compared to threads made of cotton fibers, it has superior water release properties and dries quickly. Table 1 shows conventional false twisted yarn (polyester processed yarn 150 denier/48 filaments), composite yarn used in the present invention (200 denier/108 filaments), cotton fiber spun yarn (100% cotton fiber, cotton yarn count 30 /
−) knitted fabric (structure; smooth)
This shows the results of investigating water retention and quick drying properties.

[Table] The water retention rate shown in Table 1 is calculated by immersing the sample in water.
After thoroughly kneading the fabric to absorb moisture, the fabric was dehydrated for 5 minutes in a household washing machine dehydrator, and the weight of the fabric was measured, and the amount of water retained was expressed as a percentage (%) of the original fabric weight. Water release rate is 20℃, 65% of the above dehydrated fabric.
Let the fabric dry naturally in an RH atmosphere, find the drying time until it returns to its original weight, and show the water release rate as the amount of water released per unit time. Furthermore, in the knitted fabric of the present invention, the average fiber density coefficient of the stitches of the layer made of composite yarn having such excellent water retention and quick drying properties is larger than the average fiber density coefficient of the stitches of the other layers. The water retention performance described above becomes even greater. Furthermore, since the single filament fineness of the filament disposed in the outermost layer of the composite yarn is smaller than that of the filament filament, the filament has a greater ability to trap moisture. Due to these factors, when comparing the layers of a two-layer knitted fabric, the water absorption performance of the layer formed by composite yarn,
Alternatively, the water retention performance is greater, and if the surface formed by the composite yarn is used in contact with the outside air, even if the other surface is in direct contact with the skin or underwear, the composite yarn will Moisture transfers easily to the layer consisting of the material, providing excellent wearing comfort. In this case, if at least the knitted surface made of the long fiber yarn is subjected to a hydrophilic treatment, the efficiency of water transfer will be improved, and the water retention performance of the layer made of composite yarn will not be reduced in the slightest. A knitted fabric with improved properties in both properties and water retention can be obtained. Here, methods for hydrophilic treatment include, for example, in the case of polyester fibers, a method in which a polyalkylene glycol polymer is applied and dried after hydrolysis treatment with an alkali; There is a method of treating polyamide fibers including coalescence to form streak-like micropores. Furthermore, since the knitted fabric of the present invention uses a composite yarn having a three-dimensional fusion distribution structure, it can obtain a texture similar to that of a knitted fabric made of cotton fibers,
A knitted fabric with excellent quick-drying properties and water absorption (water retention) can be obtained. Examples will be explained below. Example A knitted fabric of the present invention was obtained according to the knitting diagram shown in FIG. The numbers on the left side of FIG. 3 are the same as the yarn feeding numbers, D indicates a dial needle, and C indicates a cylinder needle. A 24-gauge double-sided circular knitting machine was used as the knitting machine, and a composite yarn (200 denier, 108 filament) was used for the first yarn feed. The composite yarn uses polyester multifilament (75 denier, 36 filament) for the core yarn and polyester multifilament (75 denier, 72 filament) for the sheath yarn, and is false twisted and heat treated to separate the core yarn and sheath yarn. The yarn used had a yarn length difference of 60% and a partially fused portion. A polyester false twisted yarn (75 denier, 24 filaments) is used for the second yarn feed, a water-soluble fiber is used for the third yarn feed, and a polyester false twisted yarn (150 filaments) is used for the fourth yarn feed. Denier, 48 filament) was used. After knitting, the knitted fabric was subjected to normal dyeing and finishing processes to dissolve the water-soluble fibers, thereby obtaining a pile knitted fabric having one side of the knitted fabric made of composite yarn. The average fiber density coefficient of unit stitches on the front and back sides of this knitted fabric is
340 and 225 on the other side. The obtained knitted fabric had excellent water retention and quick drying properties.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing the side surface of a composite yarn used in the present invention, and FIG. 2 is a sectional view showing a cross section of the composite yarn in FIG. 1. FIG. 3 shows a knitting method diagram for knitting a knitted fabric according to an embodiment of the present invention. 1... core thread, 2... fused portion, 3... sheath thread.

Claims (1)

[Scope of Claims] 1. One side of the knitted fabric is mainly composed of synthetic fiber composite yarn having a nearly core-sheath multilayer structure with fused parts interspersed therein, and the other side is composed of synthetic fiber multifilament yarn and synthetic fiber multifilament yarn. / Or a two-layer knitted fabric mainly composed of long fiber yarns made of crimped synthetic fiber multifilament yarns,
The single filament fineness of the filament mainly forming the outermost layer of the synthetic fiber composite yarn is smaller than the single filament fineness of the filament constituting the long fiber yarn, and the synthetic fiber in the two-layer structure knitted fabric The average fiber density coefficient of the stitches forming the layer of composite yarn is
A water-absorbing knitted fabric characterized by being larger than that of the long fiber yarn. However, the average fiber density coefficient of the stitch is Here, M = Average fiber density coefficient of unit stitches forming one layer li = Loop length of unit stitch fi = Number of single fibers making up the stitch di = Fineness of single fiber ki = 1 Complete structure The number of stitches in the mesh is i=1, which is the yarn feeding number of the complete structure. 2. A synthetic fiber composite yarn having a core-sheath multilayer structure is a false-twisted composite yarn in which a sheath yarn made of multifilament yarn is wound around the core yarn with a yarn length difference of 15% or more, At this time, a part of the filaments constituting the sheath yarn are wound around the core yarn in a continuous inverted alternate twist in a substantially bundled state, and the winding interface is at least partially fixed due to the fusion of the core yarn. The water absorbent knitted fabric according to claim 1, wherein the remaining filament yarns are individually separated and wound in a crimped state. 3 One side of the knitted fabric is mainly composed of synthetic fiber composite yarn having a core-sheath multilayer structure with interspersed fused parts, and the other side is composed of synthetic fiber multifilament yarn and/or synthetic fiber multifilament yarn. A knitted fabric with a two-layer structure mainly composed of long fiber yarns made of crimped yarn, in which the filament fineness of the filaments forming the outermost layer of the synthetic fiber composite yarn mainly constitutes the long fiber yarns. The fineness of the single filament is smaller than that of the filament, and the average fiber density coefficient of the stitches forming the layer of the synthetic fiber composite yarn in the two-layer knitted fabric is made larger than that of the long fiber yarn, and A water-absorbent knitted fabric, characterized in that at least a knitted surface made of the long fiber yarn has been subjected to a hydrophilic treatment. However, the average fiber density coefficient of the stitch is Here, M = Average fiber density coefficient of unit stitches forming one layer li = Loop length of unit stitch fi = Number of single fibers making up the stitch di = Fineness of single fiber ki = 1 Complete structure The number of stitches in the mesh is i=1, which is the yarn feeding number of the complete structure.