JPH05247783A - Bulky woven or knitted fabric - Google Patents

Abstract

PURPOSE:To obtain a bulky woven or knitted fabric suitable for obtaining a steric structure having a uniform interlayer as a resin-impregnated composite material excellent in repairing properties of plastic deformation by using yarn having shape memorizing characteristics in an amount of a specific wt.% or more as connecting yarn of base fabrics on the front and back sides in a woven or a knitted fabric of a multilayered structure. CONSTITUTION:In the objective woven or knitted fabric of a multilayered structure in which a base fabric on the front side is connected through yarns to a base fabric on the back side, polyester-based filament yarn having shape memorizing characteristics is used in at least 30wt.% of the connecting yarns. Thereby, the plastic deformation such as compressive deformation of the interlayer, partially recessed parts or complicated strain of the base fabrics on the front and back sides can readily be repaired by heating the fabric at a temperature for recovering the shape memorizing yarn to the original shape.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention has a multilayer three-dimensional structure,
Lightweight and bulky, as well as general clothing and sports clothing,
The present invention relates to a bulky woven or knitted fabric suitable for a base fabric of a composite material obtained by impregnating various functional resins and the like.

[0002]

2. Description of the Related Art In recent years, many three-dimensional woven and knitted fabrics have been proposed for general clothing, sports clothing, and fiber reinforced composite materials. However, such a three-dimensional woven or knitted fabric is subjected to mechanical external force such as pressure, tension, bending, etc. in higher-order processing such as dyeing or resin impregnation even if it maintains a uniform three-dimensional shape during weaving and weaving. However, the three-dimensional shape becomes asymmetrical, and the three-dimensional effect disappears, which makes it difficult to obtain satisfactory clothing and composite materials.

[0003]

Therefore, according to the present invention, it is possible to prevent the shape change due to the external force in the thickness direction, and
The object is to provide a bulky woven or knitted fabric capable of maintaining extremely uniform bulkiness.

[0004]

In order to solve this problem, the present invention is a multi-layered woven or knitted fabric in which a front surface backing fabric and a back surface backing fabric are connected by yarns, and the front and back double sided backing fabrics are connected. The gist of the high-loft woven or knitted fabric is characterized in that at least 30% by weight or more of the yarns are yarns having shape memory characteristics.

The yarn having the shape memory characteristic in the present invention means, for example, the original shape is memorized by heating at a processing temperature for memorizing the shape, and heating and cooling in a deformed state at a specific temperature below the memorized processing temperature. A typical example is a yarn whose shape is temporarily fixed by doing so, and which can be restored to its original shape by heating again at a temperature above the glass transition point in a tension-free state. Alternatively, a yarn that can be restored to its original shape by being heated at a specific temperature even if it is plastically deformed by being applied with an external force for a long time while being deformed at room temperature.

The yarn form may be any of monofilament, multifilament, crimped yarn, fluid entangled yarn, spun yarn, various composite yarns and the like.

Further, if at least 30% by weight or more of the connecting yarn is not composed of the shape memory yarn,
Sufficient recovery to the original shape is not obtained, and the woven / knitted fabric does not recover its shape satisfactorily.

The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of a bulky knitted fabric according to an example of the present invention, FIG. 2 is a schematic cross-sectional view of the bulky knitted fabric shown in FIG. 1, and FIG. 3 is a bulky knitted fabric according to an example of the present invention. 3 is a schematic perspective view showing a deformed state before the original shape is recovered, and FIG.
FIG. 4 is a schematic cross-sectional view of a compressed and deformed portion of the bulky knit shown in FIG.

In FIGS. 1 and 2, a bulky knit (1)
Has a front base fabric (2) composed of a front loop (5) and a back base fabric (3) composed of a back loop (6),
The front and back base cloths (2) and (3) are connected by a connecting thread (4) at a constant interval.

FIG. 3 shows a state in which the bulky knitted fabric (1) shown in FIG. 1 is deformed by an external force. Particularly, the deformed portion which is crushed by being strongly pressed does not recover to the original state and has a high bulkiness. Have lost.

FIG. 4 is an enlarged schematic cross-sectional view of the deformed portion of FIG. 3, showing a front loop (5) and a back loop (6).
Is not deformed, but the connecting yarn (4) is folded and compression-deformed, and is plastically deformed as it is. This plastic deformation is
It is caused by being pressed for a long time at room temperature, or by applying complex stress in a dyeing solution at high temperature. Normally, such plastically deformed woven and knitted fabrics must be corrected by applying mechanical force or heat at the same time, but in particular, the deformation and strain in the thickness direction can be corrected uniformly and at high speed. This is extremely difficult. In the bulky woven or knitted fabric of the present invention, since the connecting yarn (4) has a shape memory characteristic, if the state of FIG. 1 is stored in advance, the plastically deformed connecting yarn (4) is heated at a specific temperature. Only by doing so, it is possible to recover to the original state shown in FIG. 1 extremely easily and at high speed.

In the above-mentioned bulky woven or knitted fabric of the present invention, it is desirable that the shape is stored immediately after the cloth is formed by the loom or the knitting machine.

Next, a production example of the bulky woven or knitted fabric according to the present invention will be described.

FIG. 5 shows a conventional double circular knitting machine as shown in FIG.
FIG. 8 is a knitting action diagram for producing the bulky knitted fabric. In FIG. 5, at the first yarn feeder (F1), the dial long hand (D
L) and the dial short hand (DS) knit the back side base cloth. At the second yarn feeder (F2), the cylinder long hand (C
The surface base fabric is knitted by L) and the cylinder short needle (CS). Therefore, the back surface cloth and the front surface cloth do not have direct contact with each other and are in a separated state. At the third yarn feeder (F3), tuck knitting is performed by the dial long needle (DL) and the cylinder long needle (CL) to connect the front and back base fabrics. Therefore, this third yarn feeder (F3)
It is necessary that some of the yarns that are fed to have shape memory characteristics. Subsequently, the fourth yarn feeder (F4) and the fifth yarn feeder (F5) have the same knitting action as the first yarn feeder (F1) and the second yarn feeder (F2) respectively, and the sixth yarn feeder (F4) F
In 6), the dial short needle (DS) and the cylinder short needle (C) of knitting needles different from the knitting needles knitted at the third yarn feeder (F3) are used.
By S), the yarn including shape memory characteristics is tucked,
It becomes a connecting thread. In addition, the above first, second, fourth and fifth
The yarn to be fed to the yarn feeder (F1, F2, F4, F5) is
Any yarn may be selected and selected according to the application.

Next, among the bulky woven and knitted fabrics of the present invention, production examples of bulky fabrics will be described.

FIG. 6 is a schematic longitudinal sectional view of a bulky fabric according to an example of the present invention, and FIG. 7 shows a weaving action diagram of the bulky fabric of FIG. That is, the surface backing fabric (12) is composed of a plain weave design with the front warp (7) and the front weft (10), and the back backing fabric (13) is the back warp (8) and the back weft (1).
According to 1), it is composed of plain weave. Further, the connecting yarn (9) is alternately woven with the front weft yarn (10) of the front face fabric (12) and the back weft yarn (11) of the back face fabric (13) so that the space between both base fabrics (12) and (13) is increased. It is connected.

Explaining an example of such a method of weaving a woven fabric, the surface warp (7) drawn from the surface yarn beam (14) makes an opening motion by a heddle (not shown), and together with the surface weft (10). A surface backing (12) is formed. Similarly, the back warp (8) pulled out from the back yarn beam (15)
Forms a backside base cloth (13) by intersecting the back weft (11). The connecting yarn (9) including the shape memory yarn drawn out from the connecting yarn beam (16) passes through the middle of the warp yarns (7) and (8) on the front and back, and has a special opening of a heddle (not shown) for the connecting yarn. The front base cloth (12) and the back base cloth (13) are alternately woven by movement, and the two base cloths are connected to each other. Then heat treatment part (not shown)
Is installed to treat the bulky woven fabric in a balanced state at a temperature above the shape memory temperature. The bulky woven fabric of the present invention can be manufactured in this manner, and a velvet loom or the like which is generally commercially available may be used for such weaving.

[0019]

[Working] As in the present invention, in a multi-layer structure woven or knitted fabric in which a front surface fabric and a back surface fabric are connected by yarns, at least 30% by weight or more of the yarns connecting the front and back double-sided fabrics has a shape memory characteristic. If the yarn is used, even if plastic deformation such as dents or strains occurs in the woven or knitted fabric after weaving or knitting, if the intermediate layer is heated without tension at a temperature at which the original shape of the shape memory yarn can be recovered. The connecting yarn of No. 1 returns to its original shape, and it becomes possible to eliminate dents and distortions. If the shape memory yarn has an original shape such as a coil shape or an accordion shape, excellent compression elasticity can be obtained after recovery.

[0020]

EXAMPLES Next, examples of the present invention will be described.

Example 1 Polyester multifilament yarn 250d / 30f having a glass transition temperature of 40 ° C. and having a shape memory ability was used as a connecting yarn.
The polyester multifilament yarns 150d / 30f are used for the yarns constituting the front surface backing cloth and the back surface backing cloth, respectively, and the knitting machine gauge 20 needles / inch, the number of yarn feeders 48 feed
Using a knitting machine with a cylinder diameter of 30 inches and a dial / cylinder gap of 12 mm, knitting is performed according to the knitting action diagram shown in FIG. 5, and immediately after that, heat treatment is performed on the knitting machine at 180 ° C. for 30 seconds. I memorized the conforming shape. The resulting knitted fabric was dyed at a temperature of 120 ° C and heat set at 160 ° C. The knitted fabric was cut into 30 cm × 30 cm, and a load of 1 kg / 10 cm ² was placed on the knitted fabric for 7 days and left.

When the load was removed on the 8th day, the part on which the load was placed was deeply dented, and it did not recover even after 24 hours had passed. Then, when left in a hot air dryer set at 180 ° C. for 5 minutes in a tension-free state, the depression disappeared and the surface became uniform.

[0023]

As described above, the bulky woven or knitted fabric according to the present invention has at least 3 of the yarns connecting the front and back base fabrics.
Since 0% by weight or more is composed of yarns having shape memory characteristics, it is possible to prevent the plastic deformation such as compressive deformation of the intermediate layer or partial depressions or complicated strains of the front and back base fabrics from recovering the original shape memory yarn temperature. It can be easily repaired by heating to. In addition, if the original shape of the shape memory yarn is a special shape such as a coil shape or an accordion shape, expansion and contraction performance, particularly a spring function due to excellent compression elasticity is imparted. Furthermore, when a matrix resin or the like is impregnated into a composite material, a uniform three-dimensional structure of the intermediate layer can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a bulky knitted fabric according to an example of the present invention.

FIG. 2 is a schematic cross-sectional view of a bulky knitted fabric according to an example of the present invention.

FIG. 3 is a schematic perspective view showing a deformed state of a bulky knitted fabric according to an example of the present invention.

FIG. 4 is a schematic cross-sectional view of a compressed and deformed portion of a bulky knitted fabric according to an example of the present invention.

FIG. 5 is a knitting action diagram for producing a bulky knitted fabric according to an example of the present invention.

FIG. 6 is a schematic longitudinal sectional view of a bulky fabric according to an example of the present invention.

FIG. 7 is a weaving operation diagram for producing a bulky fabric according to an example of the present invention.

[Explanation of symbols]

 1 Bulky Knit 2 Surface Fabric 3 Back Fabric 4 Connecting Thread 5 Surface Loop 6 Back Loop 7 Front Warp 8 Back Warp 8 Back Warp 9 Connecting Thread 10 Front Weft 11 Back Weft 12 Front Base Fabric 13 Back Base Fabric 14 Front Thread Beam 15 Back Thread Beam 16 Connected thread beam DL Dial long needle DS Dial short needle CL Cylinder long needle CS Cylinder short needle F1 to F6 Yarn feeder number

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location D04H 1/52 7199-3B

Claims (1)

[Claims] 1. A multi-layered woven or knitted fabric in which a front surface fabric and a back surface fabric are connected by yarns, and at least 30% by weight or more of the yarns connecting the front and back double-sided fabrics have shape memory characteristics. A bulky woven or knitted fabric characterized by comprising yarns.