JP2010043387A - Warp knitted fabric for fabric spring material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warp knitted fabric for a fabric spring material which has a high air permeability, a little stuffy feeling while sitting, a high tensile strength and tear strength, a high surface rigidity and a feeling of stability when sitting, and an excellent stretch recovery after sitting. <P>SOLUTION: The warp knitted fabric is a mesh-like warp knitted fabric whose ground weave is composed of fibers provided from a reed row of at least two or more sheets of reeds and the total fineness of fibers which forms one stitch of the ground weave of the two sheets of reeds is 900-2,500 decitex, where a plurality of rows of wale lines of 2 rows or more of the ground weave branch away into a nearly V shape to form mesh and monofilament fibers of 300-3,000 decitex cross a nearly V-shaped part which is a part of the mesh-shape and are intercalated into the warp knitted fabric. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a warp knitted fabric suitable as a cloth spring material used as a cushion material for seat sheets for automobiles, railway vehicles, airplanes, child seats, strollers, wheelchairs, furniture, offices and the like.

  By stretching a woven or knitted fabric composed of elastic fibers such as polyetherester-based elastic fibers or polytrimethylene terephthalate fibers on the frame, it is possible to develop cushioning properties by utilizing the stretch recovery of elastic fibers. Compared to a spring or urethane cushion material, a seat having characteristics such as thinness, light weight, and high air permeability can be obtained. A woven or knitted fabric made of such elastic fibers is called a cloth spring and is being used as a cushioning material in many seats such as office chairs, furniture chairs, and vehicle seats.

  Patent Document 1 proposes an elastic warp knitted fabric in which a base knitted fabric is configured by a main knitting yarn in a mesh shape, and a main elastic yarn and a main insertion yarn are inserted into the base knitted fabric in a straight line. It is described that warp knitted fabric is excellent in form stability, has high breathability and does not give a feeling of stuffiness when used on a cushion surface that supports a body such as a stool.

  However, the warp knitted fabric described in Patent Document 1 has a fineness of the main knitting yarn and is not devised to reinforce the stress concentration portion of the mesh hole against a load caused by an external force. Therefore, the tensile strength and tear strength are not sufficient. When used for vehicle seats, when the knitted fabric is destroyed by impact at the time of collision, or when a flaw is caused by a knife or the like, the flaw is likely to spread and there is a great concern about strength.

  Patent Document 2 discloses a warp knitted fabric having a specific knitting density in which fibers of a specific fineness are used, the ground structure is composed of chain knitting and multi-needle swing tricot knitting, and insertion yarns are inserted in the vertical direction and / or the horizontal direction. This warp knitted fabric is described as a highly safe cloth spring material that has high tear resistance and is less likely to spread scratches by a blade or the like.

However, although the warp knitted fabric described in Patent Document 2 has high tear resistance, the knitted fabric is too dense and hardly air permeable, so it is easily stuffy when seated, and the weight is heavy, which reduces the weight of the seat. It was against the flow.
Japanese Patent No. 3928179 JP 2006-97170 A

  The present invention solves the conventional problems, is a cloth spring material having high breathability, low stuffiness during sitting, high tensile strength and tearing strength, and high surface rigidity and high stability during sitting. An object of the present invention is to provide a warp knitted fabric for a cloth spring material having good stretch recovery after sitting.

  In order to solve the above-mentioned problems, the present inventor has intensively studied the material to be used, the fineness, and the knitted structure, and as a result, has completed the present invention.

  That is, according to the present invention, the ground structure is constituted by fibers supplied from at least two rows of ridges, and the total fineness of the fibers constituting the first stitch of the two-row ridge is 900 to 2500 decitex. A mesh-shaped warp knitted fabric, wherein a plurality of wale rows of two or more rows of the ground structure are branched into a substantially V shape to form a mesh, and a substantially V shape that is a part of the mesh shape A warp knitted fabric characterized in that 300 to 3000 dtex monofilament fibers are inserted and knitted across the portion.

Hereinafter, the present invention will be described in detail.
The warp knitted fabric of the present invention can be suitably used as a cloth spring material. The cloth spring material is a planar cushion material obtained by stretching a cloth for a cloth spring material on a substantially quadrangular, polygonal, or various-shaped frame by various methods such as sewing, resin molding, and bolting. And the cushioning property when a person is seated is developed by utilizing the stretch characteristics of the cloth spring material.

  Cushion material can be formed only with a frame and cloth spring material, and if necessary, fibrous cushion materials such as three-dimensional knitted fabric, hard cotton, non-woven fabric, urethane, skin material, etc. are laminated on the cloth spring material. It can also be used as a cushioning material.

  In the warp knitted fabric of the present invention, the total fineness of the fibers constituting the first stitch of the mesh knitted fabric is set to 900 to 2500 dtex in order to increase the tensile strength and tear strength. The total fineness of the fibers constituting the first stitch refers to the total fineness of the fibers forming the stitch by being simultaneously hooked on one needle of the knitting machine. When two fibers are simultaneously hooked on one needle and the two fibers are bundled to form one stitch, this is indicated by the total fineness of the two fibers.

  If the total fineness of the fibers constituting the first stitch is less than 900 dtex, the tensile strength and tear strength are reduced. When the total fineness of the fibers constituting the first stitch exceeds 2500 dtex, it becomes difficult to make a mesh shape, the opening ratio is lowered and the air permeability is poor, and the warp knitted fabric is excessively heavy and knitted. It will also be difficult.

  Synthetic fibers such as polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, polybutylene terephthalate fibers, polyester-based elastomer fibers, polyamide-based fibers, and polypropylene-based fibers are preferably used as the fibers used in the ground texture of the warp knitted fabric.

  The cross-sectional shape of the fiber can be any shape such as round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, eight-leaf-shaped, flat-shaped, dog-bone-shaped, etc. However, a round shape is preferable in order to obtain a stronger ground structure. As the form of the fiber, any of unprocessed yarn, spun yarn, twisted yarn, false twisted yarn, fluid injection processed yarn, etc. may be used. However, in order to improve the tensile strength and tear strength of the ground texture, It is preferable to use (unprocessed yarn).

  The mesh warp knitted fabric of the present invention has a total fineness of the fibers constituting the first stitch of 900 to 2500 dtex, but in order to further increase the tensile strength and tear strength of the knitted fabric and obtain appropriate air permeability. In a 2.54 cm square knitted fabric, the ground texture filling index indicated by the relationship between the number of stitches and the total fineness of fibers constituting the first stitch is preferably 3000 to 11000.

However, ground texture filling index = (total fineness of fibers constituting the first stitch) ^0.5 × (number of stitches in 2.54 cm square knitted fabric)
When the texture filling index is 3000 or more, sufficient tensile strength is obtained, and when it is 11000 or less, the aperture ratio is sufficient and air permeability is excellent, and knitting is easy.

  As a method of making the warp knitted fabric of the present invention into a mesh shape, for example, using at least two fibers constituting the ground structure, the fiber arrangement to the guide is 1 in 1 out, 2 in 2 out, It is preferable to form a mesh shape such as a hexagonal pattern, a diamond pattern, or a substantially circular pattern by adopting a thread drawing arrangement such as 3 in 1 out.

  Regarding the formation of the mesh hole, adjacent wal rows in a part of the warp knitted fabric are branched to form an opening, and the wal rows that have been branched after knitting a plurality of courses are joined again to close the opening. The length of the wales that divide into multiple courses is the size of the mesh.

  When adjacent wale rows branch, for example, as shown in FIG. 1, the branching wale row forms a substantially V shape immediately after branching, but in the present invention, in order to improve the tear strength of the knitted fabric, A 300-3000 dtex monofilament fiber is inserted and knitted across the substantially V-shaped portion. Monofilament fiber has high bending rigidity and excellent bend recovery. Inserting it across the substantially V-shaped part of the mesh hole improves the surface rigidity of the knitted fabric and provides a stable sitting comfort. The warp knitted fabric is excellent in stretch recovery after sitting and shape stability.

  In addition, when the mesh-shaped warp knitted fabric is torn, stress concentrates on the knitting at the place where the wale row branches, and the tearing is chained by breaking the fibers of the knitting part of the branch part. In order to improve the tear strength, it is extremely important to insert and knit monofilament fibers across a substantially V-shaped portion where the wale row branches. Thereby, it is prevented that stress concentrates on the branching portion of the wale row, and the tearing strength is improved.

The monofilament to be inserted into the substantially V-shaped portion may be inserted into at least one stitch of the stitch row forming the substantially V-shaped portion. However, in order to further improve the tearing strength, the monofilament is arranged in the stitch row of the substantially V-shaped portion. Two or more are preferably inserted.
The position where the monofilament fiber is inserted into the substantially V-shaped wale row may be any position in the substantially V-shape, but the monofilament fiber is inserted in the first stitch where the wale row is branched. Is preferable and contributes to the distribution of tear stress.

  As a method of inserting a monofilament into at least one knitting of a wale row forming a substantially V shape, a method of inserting it in a straight line in the width direction of the knitted fabric, or so as to cross a mesh hole along a wale row forming a mesh A method of inserting while meandering is preferably used.

  At this time, if the monofilament fiber inserted into the ground structure slips, the stretch recovery property of the warp knitted fabric is impaired, or the stitch of the ground structure is easily deformed by an external force, causing a problem, but the monofilament fiber is prevented from slipping. For this purpose, it is preferable to insert the monofilament fiber in the length direction of the warp knitted fabric while meandering so as to cross the mesh holes or wale rows. In order to further prevent slipping, it is preferable to use a heat-sealable monofilament fiber whose surface is formed of a polymer having a low melting point.

  When monofilament fibers are inserted in a straight line in the width direction of the knitted fabric, the monofilament fibers held in the stitches of the ground structure are likely to slip, so the heat-fusible monofilament fibers whose surface is formed of a low melting point polymer Is preferably used.

  As the type of monofilament fiber used in the present invention, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyethylene terephthalate fiber, polyamide fiber, polypropylene fiber, polyether ester elastic fiber, and the like are preferably used. The monofilament fiber is preferably an elastic yarn, more preferably polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, or polyether ester-based elastic fiber excellent in elastic recovery.

  As the heat-fusible monofilament fiber, it is preferable to use a monofilament fiber having a core-sheathed cross section and a high melting point on the core side so as to have a melting point difference of 60 ° C to 20 ° C. At this time, the core-side area composition ratio is a yarn cross-sectional area ratio, and the core component is preferably 50% or more, and more preferably 70% or more.

  In the present invention, the V-shaped angle of the substantially V-shaped portion is arbitrary depending on the shape and size of the mesh, and the wale row forming the substantially V-shaped may be linear or curved. Further, the “substantially V-shaped” may be a case where the knitting end direction is viewed upward, or a case where the knitting start direction is viewed upward.

  The warp knitted fabric of the present invention needs to have a mesh shape in order to improve air permeability and prevent a feeling of stuffiness during sitting. The mesh opening ratio is preferably 10 to 50%, more preferably 10 to 40%. When the open area ratio is 10 to 50%, the tearing strength is sufficient, and excellent air permeability and anti-steaming effect can be obtained.

The warp knitted fabric of the present invention is preferably knitted with a double raschel knitting machine to give a three-dimensional knitted fabric when cushioning is imparted in the thickness direction to further improve sitting comfort and vibration absorption.
In the case of a three-dimensional knitted fabric, the back surface can be a warp knitted fabric of the present invention, and the front surface can be a three-dimensional knitted fabric having a mesh knitted fabric similar to the back surface or a mesh knitted fabric having a different shape.

  In the three-dimensional knitted fabric, any fiber can be used as the fiber used on the surface, but polyethylene terephthalate fiber is preferably used from the viewpoint of easy recyclability, durability, and low cost. Moreover, the cushioning property of the thickness direction can be provided using a monofilament fiber and a multifilament fiber as a connection thread | yarn. In order to further develop cushioning properties, it is preferable to use monofilament fibers as the connecting yarn. As the material of the monofilament fiber used as the connecting yarn, the same fiber as the monofilament fiber inserted into the ground tissue can be used.

  In the warp knitted fabric of the present invention, the tensile strength in the vertical direction and the horizontal direction is preferably 800 N / 4 cm width or more, and more preferably 1000 N / 4 cm width or more. When the tensile strength is 800 N / 4 cm width or more, the safety of the seat can be maintained without breaking the knitted fabric even in the event of a collision or when an excessive load is applied to the knitted fabric. The higher the tensile strength in the vertical and horizontal directions, the better, but the upper limit is naturally limited by the performance of the fiber.

  The elongation rate in the vertical direction and the horizontal direction is as follows. When the direction of stress is the A direction and the direction of low stress is the B direction when 5% is extended in the vertical or horizontal direction, The ratio of the stress (A) and the stress (B) at the time of 5% elongation in the B direction is preferably (A) / (B) = 1.1 to 10.0.

  When the stress ratio (A) / (B) is 1.1 or more, the fit to the human body is excellent and a good sitting comfort is obtained. When the stress ratio is 10.0 or less, it is difficult for wrinkles to enter in the A direction when seated, there is no sense of incongruity in the hips, and when tension is applied in the A direction and the two sides are fixed. The width of the two unfixed sides along the A direction is difficult to contract, the discomfort of the buttocks does not occur, and a firm and stable sitting comfort is obtained.

  The warp knitted fabric of the present invention is preferably used for a seat that is stretched on a frame to form a seat and / or a back, but the state in which the warp knitted fabric is stretched on the frame as a fabric spring material is limited. Instead, the cloth spring material may form the seat portion or the back portion of the seat by stretching the periphery or at least two sides of the cloth spring material in a tensioned state or a slack state on the back portion or the frame of the seat.

  As a method of fixing the warp knitted fabric to the frame as the fabric spring material, any method can be used. For example, as described in JP-A-2002-219985, a plate member having a groove portion with a substantially U-shaped cross section is fixed to the end portion of the knitted fabric, and the groove portion of the plate member is related to an appropriate frame material. Cavity method, after processing the end part of the cloth spring material by welding, sewing, resin processing, etc., then pressing the end part with a pressing member etc. and fixing it to the frame with bolting etc., the cavity where the end part is folded and sewn Arbitrary methods, such as a method of passing a metal rod through the inside and fixing the metal rod to the frame, can be used.

In addition, by using a method of fixing the warp knitted fabric of the present invention to a frame via a metal spring such as a coil spring or a torsion bar as a fabric spring material, it is possible to give a cushioning property with a further stroke feeling. it can.
The warp knitted fabric of the present invention is preferably knitted using a Russell knitting machine, and the gauge of the knitting machine is preferably 9 gauge to 28 gauge, more preferably 9 gauge to 18 gauge. .

The basis weight of the warp knitted fabric can be arbitrarily set according to the purpose, but in the case of a single knitted fabric, it is preferably 250 to 1000 g / m ² , more preferably 300 to 800 g / m ² , and in the case of a three-dimensional knitted fabric , preferably 500-1500 g / m ^2, more preferably 600~1300g / m ^2.

As a finishing method of warp knitted fabric, the raw machine can be finished through processes such as scouring, dyeing and heat setting, but the scouring and dyeing process can be omitted and the raw machine can be finished only by heat setting.
Moreover, at the time of finishing set, finishing processing such as resin processing, water absorption processing, antistatic processing, antibacterial processing, water repellent processing, and flame retardant processing, which are usually used for fiber processing, can be applied as long as the object of the present invention is not impaired. .

As the heat treatment machine used in the finishing set, a pin tenter, a clip tenter, a short loop dryer, a shrink surfer dryer, a drum dryer, a continuous and batch tumbler, and the like can be used.
The warp knitted fabric of the present invention is a tension type seat as a fabric spring material after finishing, by processing the end by means of fusion, sewing, resin processing, etc., or processing into a desired shape by thermoforming or the like Etc. can be used.

  The warp knitted fabric for the fabric spring material of the present invention has high breathability, little stuffiness when seated, high tensile strength and tear strength, and high surface rigidity when seated, with a sense of stability, after seating And good stretch recovery.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto. In addition, the evaluation method and measurement method of each characteristic are as follows.
Moreover, the manufacturing method of the heat-fusion monofilament used in the example was shown as a reference example.

(1) Mesh opening ratio H (%)
Using an image analysis apparatus (VH-7000) manufactured by Keyence Corporation, an enlarged photograph (5 to 20 times) of the needle loop side of the ground structure of the warp knitted fabric of the present invention was taken from a direction perpendicular to the surface of the knitted fabric and 10 cm square. (Or a copy of the photograph taken).
A line is drawn from the photograph (or copy) to the boundary between the opening without fiber and the non-opening where the fiber is present, and all the openings are cut out. When the weight of the opening is A (g) and the weight of the non-opening is B (g), the opening ratio is calculated at the ratio shown in the following equation.
H (%) = [A / (A + B)] × 100

(2) Tensile strength of warp knitted fabric (N)
Three test pieces obtained by cutting a warp knitted fabric into 20 cm × 4 cm strips are sampled in the warp direction (knitting fabric length direction) and the transverse direction (knitting fabric width direction).
Using Shimadzu Autograph AG-B type (manufactured by Shimadzu Corporation), with the test piece suspended under its own weight, it was fixed to the upper and lower chucks with a grip interval of 10 cm, and the test piece was pulled at a speed of 50 mm / min. The maximum tensile strength (N / 4 cm width) until the warp knitted fabric breaks is measured. The value is an average value measured three times.

(3) Stress at 5% elongation (N)
From the load-displacement curve as a result of evaluating the tensile strength of the warp knitted fabric, the tensile stress when stretched to 5% is obtained. Measure the vertical and horizontal directions three times, and determine the average value of each. The direction in which the stress at 5% elongation is high is taken as the A direction.

(4) Tear strength (N)
A test piece obtained by cutting a warp knitted fabric into 25 cm × 5 cm strips is cut in parallel with the long side from the center of the short side (5 cm side).
Using Shimadzu Autograph AG-B type (manufactured by Shimadzu Corporation), one end of the two ends 2.5 cm wide by cutting was fixed to the upper chuck, and the test piece was suspended under its own weight. The other 2.5 cm wide end is fixed to the lower chuck. At this time, the gripping interval is 10 cm, the test piece is pulled at a speed of 200 mm / min, and the maximum value of the tear strength is measured. The value is an average value measured three times.

(5) Air permeability Measured according to JIS-L-1096 (Fragile method).

(6) Sitting comfort in a stretched seat (feeling of stuffiness, uncomfortable feeling due to the width, stability) and recoverability Seat frame (no backrest) made of a mouth-shaped metal pipe with a seat width of 52cm, depth of 47cm, and height of 32cm ).
50 cm wide x 57 cm long warp knitted fabric (on the short side) on both sides in the length direction of the length direction of the above (3) (A direction obtained by measuring the stress at 5% elongation in 5%) A substantially U-shaped plate made of polybutylene terephthalate resin is attached to the entire width by sewing.

  One of the warp knitted fabric's approximately U-shaped plate meshes with a metal approximately U-shaped plate attached under the front edge of the seat frame, and the seat is in a state where a tension of 10Kg is applied uniformly to the entire width of the warp knitted fabric. The warp knitted fabric is stretched before and after the frame, and the warp knitted fabric is stretched by meshing with the metal substantially U-shaped plate below the rear edge of the seat frame and the resin substantially U-shaped plate of the warp knitted fabric. If the position of the substantially U-shaped plate made of metal and the position of the nearly U-shaped plate made of resin are shifted due to the tension of 10 kg, the position of the metal nearly U-shaped plate made of resin is shifted and adjusted.

Matching the direction of warp knitted fabric with the direction of the knee, a 65 kg male sits on the seat for 10 minutes and then leaves.
As evaluation of sitting comfort at the time of sitting, the feeling of stuffiness of a warp knitted fabric is relatively evaluated in the following four stages.

◎: No stuffiness ○: Little stuffiness △: Slight stuffiness ×: Very stuffy

Also, the sense of discomfort at the time of sitting (sensation that the knitted fabric swells in the recess of the buttocks and sits on a foreign object) is evaluated relative to the following four levels by sensory evaluation.
◎: There is no sense of incongruity ○: There is almost no sense of incongruity

Furthermore, the stability at the time of sitting is evaluated relative to the following four levels.
A: Moderate surface rigidity and excellent stability ○: Surface rigidity is slightly higher and there is stability △: Surface rigidity is slightly lower and stability is slightly inferior ×: Surface rigidity is lower and stability is inferior,

Furthermore, the state of recovery of the cloth spring after leaving the seat is visually evaluated, and the relative evaluation is performed in the following four stages.
◎: Fully restored ○: Almost restored △: Slightly indented (deformed) ×: Largely indented

[Reference Example] (Manufacture of heat-fusible monofilament fiber)
The heat-fusible monofilament fiber used in the examples was produced by the following method.
Dimethyl terephthalate and ethylene glycol were charged, and a transesterification reaction was performed according to a conventional method with a small amount of catalyst to obtain an oligomer. On the other hand, adipic acid and ethylene glycol were charged, and an esterification reaction was carried out according to a conventional method with a small amount of catalyst to obtain an oligomer. Next, each oligomer obtained was mixed with a small amount of an antioxidant and subsequently subjected to a polycondensation reaction to obtain a copolyester having a melting point of 120 ° C., a glass transition temperature of 0 ° C., and a density of 1.25 g / cm ³ .

Using the obtained copolymer polyester as a sheath component, polytrimethylene terephthalate (inherent viscosity [η] 0.92, melting point 227 ° C., density 1.35 g / cm ³ ) as a core component under the following production conditions, the sheath core structure Monofilament fibers were produced.

Sheath component polymer discharge amount: 2.4 g / min Sheath component polymer melting temperature: 200 ° C.
Core component polymer discharge amount: 4.9 g / min Core component polymer melting temperature: 260 ° C.
Spinning temperature: 260 ° C
Cooling bath water temperature: 40 ° C

Take-up roll (first roll) peripheral speed: 8.8 m / min Stretching bath water temperature: 55 ° C.
Stretching roll (second roll) peripheral speed: 44 m / min Dry heat heater temperature: 140 ° C.
Third roll peripheral speed: 40 m / min Winding speed: 40 m / min

  Under the manufacturing conditions, a sheath-core monofilament fiber having a round cross section, a core area ratio of 65%, a fineness of 3230 dtex, a breaking strength of 2.2 cN / dtex, and a breaking elongation of 50% was obtained. The melting point of the sheath component was 121 ° C., and the glass transition temperature was 0 ° C.

式中のηｒは、純度９８％以上のｏ−クロロフェノール溶媒で溶解したポリトリメチレンテレフタレート糸またはポリエチレンテレフタレート糸の稀釈溶液の３５℃での粘度を、同一温度で測定した上記溶媒の粘度で除した値であり、相対粘度と定義されているものである。Ｃはｇ／１００ｍｌで表されるポリマー濃度である。 The intrinsic viscosity [η] (dl / g) is a value obtained based on the definition of the following formula.

Ηr in the formula is the viscosity of a diluted solution of polytrimethylene terephthalate yarn or polyethylene terephthalate yarn dissolved in an o-chlorophenol solvent with a purity of 98% or more, divided by the viscosity of the solvent measured at the same temperature. Which is defined as relative viscosity. C is the polymer concentration expressed in g / 100 ml.

[Example 1]
Using a 14-gauge Russell knitting machine equipped with four ridges, a 1376 decitex / 192 filament polyethylene terephthalate fiber yarn from the heel (L1, L2) forming the ground structure is 1 in 1 out from the heel of L1. Supplied in a 1-in-1 array from the L2 cocoon, and two 390 decitex polytrimethylene terephthalate monofilaments (manufactured by Solotex Co., Ltd.) are aligned from the cocoon for insertion yarn (L3). In this state, it was supplied in a 1-in-1-out arrangement.

  In the knitting structure shown below, the insertion yarn was inserted so as to cross almost all the course of the mesh shape, and the raw machine was knitted at a density of 14.0 pieces on the machine course / 2.54 cm. The resulting green machine was 25% wide and heat-dried at 170 ° C. for 2 minutes to obtain a warp knitted fabric. Table 1 shows various physical properties of the obtained warp knitted fabric.

(Knitting organization)
L1: 20/24/20/24/20/24 /
46/42/46/42/46/42 / (1 in 1 out)
L2: 46/42/46/42/46/42 /
20/24/20/24/20/24 / (1 out 1 in)
L3: 00/88/00/88/00/22 /
1010/22/1010/22/1010/88 / (1 in 1 out)
The obtained warp knitted fabric was a warp knitted fabric having high tensile strength and tear strength, high air permeability, and low stuffiness. Moreover, it was a warp knitted fabric excellent in recoverability without extending too much in the horizontal direction.

[Example 2]
In Example 1, the knitting structure of L3 is the knitting structure shown below, the insertion yarn is one course of the substantially V-shaped portion of the mesh shape, and the wale row is the length direction of the knitted fabric with the mesh most open. A warp knitted fabric was obtained in the same manner as in Example 1 except that a parallel portion (non-substantially V-shaped portion) was inserted across two courses. Table 1 shows various physical properties of the obtained warp knitted fabric.

The obtained warp knitted fabric was a warp knitted fabric having high tensile strength and tear strength, high air permeability, and low stuffiness. In addition, it was a warp knitted fabric that was slightly stretchable in the horizontal direction.
(Knitting organization)
L3: 00/44/00/88/00/22 /
1010/66/1010/22/1010/88 / (all-in)

Example 3
Using a 14G Russell machine equipped with a weft insertion device, in the same ground structure as in Example 1, the heat-fusible monofilament fiber produced in the reference example was inserted into the substantially V-shaped part of the mesh by one course of weft. A warp knitted fabric was obtained by dry heat setting in the same manner as in Example 1.

In the obtained warp knitted fabric, the insertion yarn is inserted in a straight line along the entire width of the warp knitted fabric, and the monofilament sheath of the insertion yarn is melted and fused with the fibers of the ground structure during dry heat setting. It was what was. Table 1 shows various physical properties of the obtained warp knitted fabric.
The obtained warp knitted fabric was a warp knitted fabric having high tensile strength and tear strength, high air permeability, and low stuffiness. Also, the surface rigidity was high, and the seating comfort was stable.

Example 4
Using a 14G double russell machine, a 1376 decitex / 192 filament polyethylene terephthalate fiber yarn from the heel (L4, L5) forming the ground texture is arranged in a 1-in-1 out arrangement from the heel of L4, from the heel of L5. 1 in 1-in arrangement, while 390 decitex polytrimethylene terephthalate monofilaments (manufactured by Solotex Co., Ltd.) are drawn from the cocoon for insertion yarn (L6). Supplied in an in-out sequence.

  Further, false twisted yarns of polyethylene terephthalate fibers of 500 dtex / 144 filaments from the ridges (L1, L2) forming the ground texture on one side are arranged in 1 in 1 out from the heel of L1, and 1 out 1 in from the heel of L2. On the other hand, two monofilaments (manufactured by Solotex Co., Ltd.) of 390 decitex polytrimethylene terephthalate fibers were drawn from the L3 strands constituting the connecting yarn, and supplied in an all-in arrangement. .

In the knitting structure shown below, the insertion yarn was inserted so as to cross almost the entire course of the mesh shape of the ground structure, and the raw machine was knitted at a density of 14.0 on-machine courses / 2.54 cm.
The resulting green machine was 25% wide and heat-dried at 170 ° C. for 2 minutes to obtain a warp knitted fabric. Table 1 shows various physical properties of the obtained warp knitted fabric.

(Knitting organization)
L1: 2022/2422/2022/2422/2022/2444 /
4644/4244/4644/4244/4644/4222 /
(1 in 1 out)
L2: 4644/4244/4644/4244/4644/4222 /
2022/2422/2022/2422/2022/2444 /
(1 out 1 in)
L3: 2024 / (all in)

L4: 2220/2224/2220/2224/2220/2224 /
4446/4442/4446/4442/4446/4442 /
(1 in 1 out)
L5: 4446/4442/4446/4442/4446/4442 /
2220/2224/2220/2224/2220/2224 /
(1 out 1 in)
L6: 0000/8888/0000/8888/0000/2222 /
10101010/2222/10101010/2222/10101010/8888 /

  The obtained warp knitted fabric was a warp knitted fabric having high tensile strength and tear strength, high air permeability, and low stuffiness. Furthermore, the cushioning property in the thickness direction was excellent.

[Comparative Example 1]
Using a 14-gauge Russell knitting machine equipped with four ridges, 840 decitex / 144 filament polyethylene terephthalate fibers are fed in an all-in arrangement from the ridges (L1, L2) forming the ground structure, and inserted yarns Two monofilaments (manufactured by Solotex Co., Ltd.) of 390 decitex polytrimethylene terephthalate fibers were drawn from the jar (L3) for use and supplied in an all-in arrangement.

  With the following knitting structure, the raw machine was knitted at a density of 17.0 on-machine courses / 2.54 cm. The obtained raw machine was dry heat set at 150 ° C. for 3 minutes with a width to obtain a warp knitted fabric. Table 1 shows various physical properties of the obtained warp knitted fabric.

(Knitting organization)
L1: 20/02 / (all-in)
L2: 20/1012 / (all in)
L3: 44/00 / (all in)
Although the obtained warp knitted fabric had high tensile strength and tear strength, there was no opening (that is, it was not mesh-like), so it was a warp knitted fabric with low breathability and a very stuffy feeling.

[Comparative Example 2]
In Example 1, the knitting structure of L3 is the knitting structure shown below, and the insertion yarn is inserted along the wale row of the ground structure without crossing the substantially V-shaped portion of the mesh. I got a warp knitted fabric. Table 1 shows various physical properties of the obtained warp knitted fabric.

(Knitting organization)
L3: 00/44/00/44/00/22 /
66/22/66/22/66/44 / (1 in 1 out)
The obtained warp knitted fabric was a warp knitted fabric with high breathability and low stuffiness, but low tear strength and was too stretched in the horizontal direction. Further, the surface rigidity was low and the stability was inferior, and the recoverability after sitting was poor.

[Comparative Example 3]
Using an 18-gauge Russell knitting machine equipped with four ridges, a 560 dtex / 96 filament polyethylene terephthalate fiber yarn from the heel (L1, L2) forming the ground structure is 1 in 1 out from the heel of L1. Supplied in a 1-out 1-in arrangement from the L2 cocoon, while two 390 decitex polytrimethylene terephthalate monofilaments (manufactured by Solotex Co., Ltd.) are supplied from the cocoon for insertion yarn (L3). In a state of being aligned, they were supplied in a 1-in-1-out arrangement.

In the same knitting structure as in Example 1, a raw machine was knitted at a density of 20.0 on-machine courses / 2.54 cm. The resulting green machine was 25% wide and heat-dried at 170 ° C. for 2 minutes to obtain a warp knitted fabric. Table 1 shows various physical properties of the obtained warp knitted fabric.
The obtained warp knitted fabric was too low in both tensile strength and tear strength.

The warp knitted fabric of the present invention can be used as a cushion material for seats for automobiles, railway vehicles, airplanes, child seats, strollers, wheelchairs, furniture, offices, etc., has high tensile strength, tear strength, blades, etc. It is suitable for use as a highly safe cloth spring material, which is difficult to spread due to scratches caused by cigarettes and tobacco fire. Also, it is suitable for use as a fabric spring material with high breathability, low stuffiness when seated, high surface rigidity, stable seating comfort, and excellent stretch recovery after sitting. it can.

In the warp knitted fabric of this invention, it is a figure which shows an example of the substantially V-shaped part of a mesh shape.

Claims (5)

  A mesh-like warp knitted fabric in which the ground structure is constituted by fibers supplied from at least two rows of ridges, and the total fineness of the fibers constituting the first stitch of the two-row ridge structure is 900 to 2500 dtex And a plurality of wale rows of two or more rows of the ground structure branch into a substantially V shape to form a mesh, crossing a substantially V shape portion that is a part of the mesh shape, 300 A warp knitted fabric in which monofilament fibers of ˜3000 dtex are inserted and knitted.   The warp knitted fabric according to claim 1, wherein the opening ratio is 10 to 50%.   The warp knitted fabric according to claim 1 or 2, wherein the monofilament fiber is an elastic yarn.   The warp knitted fabric according to any one of claims 1 to 3, wherein the tensile strength in the vertical and horizontal directions is 800 N / 4 cm width or more.   The warp knitted fabric according to any one of claims 1 to 4, which is a three-dimensional knitted fabric knitted by a double raschel knitting machine.

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