JP3394183B2 - 3D knitting - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional knitted fabric.
More specifically, the present invention relates to a three-dimensional knitted fabric further improved in fitting to a human body and shape followability without impairing compression elastic recovery. 2. Description of the Related Art A three-dimensional knitted fabric composed of a front and back two-layered knitted fabric and a connecting yarn for connecting the two-layered knitted fabric has various uses such as cushioning materials due to its excellent air permeability and compression elastic recovery. It is used especially for supporters, linings, shoulder pads, etc.
When used for the human body, there is a demand for a material that is further improved in fit and shape followability with a human body without impairing excellent breathability and compressive elasticity recovery. Conventionally, in order to improve the fit of the three-dimensional knitted fabric to the human body and the ability to follow the shape to the movement, the front and back knitted fabrics are meshed, and the knitting density is further reduced. A method of reducing the bending rigidity of the three-dimensional knitted fabric by reducing the thickness is used. However, when the knitting density is reduced or the thickness of the connecting yarn is reduced, the three-dimensional knitted fabric becomes soft, but the compression elastic recovery is inferior, and there is a problem that the intended cushion effect is not obtained. [0003] The present invention has been made to solve the above-mentioned problems, and to provide a three-dimensional knitted fabric which further improves the fit to the human body and the shape following ability without impairing the compressive elasticity recovery. It is intended for. Means for Solving the Problems The inventors of the present invention have made intensive studies on the thickness, density, etc., of the knitted fabrics and connecting yarns constituting a three-dimensional knitted fabric. It has been found that the object of the present invention is achieved and the present invention has been achieved. That is, the present invention is a three-dimensional knitted fabric composed of a front and back two-layer knitted fabric and a connecting yarn that connects the two-layer knitted fabric,
A three-dimensional knitted fabric characterized in that the connecting yarn is made of polytrimethylene terephthalate fiber. Hereinafter, the present invention will be described in more detail. [0005] The polytrimethylene terephthalate fiber in the present invention refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit contains about 50 mol% or more, preferably 70 mol% or more, and more preferably 80 mol% or more. Mol% or more, more preferably 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is within a range of about 50 mol% or less, preferably 30 mol% or less, further 20 mol% or less, and more preferably 10 mol% or less. Polytrimethylene terephthalate contained. [0006] Polytrimethylene terephthalate is produced by condensing terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this production process, an appropriate one or two or more third components may be added to form a copolymerized polyester, or
Polyester other than polytrimethylene terephthalate such as polyethylene terephthalate, polyester, nylon and polytrimethylene terephthalate may be separately produced and then blended or composite-spun (sheath core, side-by-side, etc.). The third components to be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexane dicarboxylic acid, etc.), and aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.). ), Aliphatic glycols (ethylene glycol, 1,2
-Propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanediol, etc.), aromatic dioxy compounds (hydroquinone bisphenol A, etc.), aliphatic glycols containing aromatics (1, 4
-Bis (β-hydroxyethoxy) benzene, etc.), polyether glycols (polyethylene glycol, polypropylene glycol, etc.), aliphatic oxycarboxylic acids (ω
-Oxycaproic acid), aromatic oxycarboxylic acids (P
-Oxybenzoic acid, etc.). Also one or three
Compounds having more than one ester-forming functional group (such as benzoic acid or glycerin) can also be used as long as the polymer is substantially linear. Further, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricating agents such as aerosil, and antioxidants such as hindered phenol derivatives. An oxidizing agent, a flame retardant, an antistatic agent, a pigment, a fluorescent whitening agent, an infrared absorbing agent, an antifoaming agent and the like may be contained. The spinning of the polytrimethylene terephthalate fiber used in the present invention is 1500
After spinning at a winding speed of about m / min to obtain an undrawn yarn,
Either a method of twisting at a rate of about 2 to 3.5 times, a direct drawing method in which a spinning-drawing step is directly connected, or a high-speed spinning method (spin draw or spin take-up method) with a winding speed of 5000 m / min or more is adopted. You may. In the three-dimensional knitted fabric of the present invention, it is necessary to use polytrimethylene terephthalate fiber for the connecting yarn.
The polytrimethylene terephthalate fiber has a density of 20 to 500 denier, preferably 50 to 2 denier.
It is effective to use a monofilament yarn of 50 denier, but a multifilament yarn, spun yarn or crimped yarn of equivalent total denier may be used. As the cross-sectional shape of the polytrimethylene terephthalate fiber, any cross-section such as a circle, a square, a triangle, and a flat shape can be used. The polytrimethylene terephthalate fiber preferably has a strength of 2 to 5 g / d, an elastic modulus of 20 to 40 g / d, and an elastic recovery of 90% at 10% elongation. The recoverability, the fit to the human body, and the shape followability are improved. Further, the fibers forming the front and back knitted fabric of the three-dimensional knitted fabric of the present invention include cotton, cupra, rayon, purified cellulose fiber, polyester, polyamide, polytrimethylene terephthalate fiber and the like if the object of the present invention is achieved. Natural fiber, synthetic fiber, etc., any fiber may be used, and the form may be filament or staple, and any form such as original yarn, mixed fiber yarn, mixed spun yarn, false twisted yarn, etc. . Also, the cross section of the single fiber can be arbitrarily selected. The three-dimensional knitted fabric of the present invention can be knitted by a double Raschel machine, a double circular knitting machine or the like having two needle rows. The front and back knitted fabric may be a knitted fabric having a plurality of openings, such as a mesh knitted fabric and a margiette knitted fabric, to further improve air permeability and water permeability.
Further, the front and back knitted fabrics may have the same knitting structure or different structures. The knitting density of the connecting yarn is 5 square centimeters.
Assuming that the number of connecting yarns in the bundle is N (number of yarn / 5 cm ² ), the denier of the connecting yarn is D (g / 9 × 10 ⁵ cm), and the specific gravity of the connecting yarn is ρ (g / cm ³ ), The total cross-sectional area of the connecting yarn in the double knitted fabric of 5 square centimeters (ND · 9 × 10 ^5.
ρ) is 0.1 to 1.0 cm ² , more preferably 0.3 to 1.0 cm ²
When it is 0.6 cm ² , the three-dimensional knitted fabric has a moderate elastic recovery property,
It has a fitting property and a shape-following property, and is optimal when used for applications in contact with the human body. If it is less than 0.05 cm ² , the elastic recovery will be reduced, and if it is more than 1.0 cm ² , the fit and shape follow-up properties will be reduced. A three-dimensional knitted fabric in which polytrimethylene terephthalate having the above-mentioned physical properties is used as a connecting yarn at a knitting density in the above-mentioned range is low in the elastic modulus inherent to PTT fibers, and is not suitable for a human body as a three-dimensional knitted fabric. Contributes to the fit, and also has a moderate elastic recovery. That is, by combining the polytrimethylene terephthalate fiber having the specific physical properties with the specific structure of the three-dimensional knitted fabric, it is possible to simultaneously satisfy the elastic recovery property and the fitting property (softness) to the human body. The connecting yarn may form a loop-shaped stitch in the front and back knitted fabric, and may have a structure in which the front and back knitted fabric is hooked in a tack structure.The point is that the front and back knitted fabric may be connected, if necessary. You can arrange the connecting thread at an angle,
They may be arranged so as to cross in an X shape. The thickness and the basis weight of the three-dimensional knitted fabric may be appropriately selected as desired. When the three-dimensional knitted fabric is used as a cushioning material, a cushioning material, or a shape-retaining material that fits the human body, for example, it is light and bulky. The thickness is about ^{2 to 20} mm, preferably about 3 to 10 mm, and the basis weight is 80 g / m ^2.
About 700 g / m ² , preferably 100 to 400 g / m ²
It may be to the order of m ^2. The double knitted fabric may be cut into a desired size as required, or the cut knitted fabric piece may be used in a desired shape by sewing or thermoforming. Examples of applications of the three-dimensional knitted fabric of the present invention include cushioning materials that come into contact with the human body, such as shoulder pads, bra cups, leggings cushioning materials, supporter cushioning materials, lining materials such as warm clothing, helmet linings, and human body protection pads.
It can be suitably used for applications such as cushioning materials, shape-retaining materials, and heat-retaining materials. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to embodiments, but the present invention is not limited to the embodiments. <Method for producing polytrimethylene terephthalate fiber> ηsp
The polytrimethylene terephthalate of /c=0.8 is discharged from the spinneret at a spinning temperature of 270 ° C., quenched in a cooling bath of 15 ° C., wound up on a first roll at 12.4 m / min. 2nd while stretching 4 times between heaters
After being wound up by a roll, a relaxation treatment was performed at 150 ° C. to obtain a 180d drawn monofilament yarn. The strength, elongation, elastic modulus and elastic recovery at 10% elongation of the obtained drawn yarn were 3.0 g / d, 4 g and 4 g, respectively.
9%, 30 g / d and 98%. The elastic recovery rate at 10% elongation was determined by applying an initial load of 0.01 g / d to the sample and elongating it at a constant rate of 20% elongation per minute. Conversely, contraction is performed at the same speed to draw a stress-strain curve. During shrinkage, the residual elongation when the stress is reduced to 0.01 g / d, which is equal to the initial load, is L
Is a value calculated by the following equation. Elastic recovery rate at 10% elongation = [(10−L) / 10] ×
The method of measuring the properties of the three-dimensional knitted fabric will be described below. (1) After applying a load of 0.6 kg / cm ² in the thickness direction of the three-dimensional knitted fabric having compressive elasticity recovery for 5 minutes, the thickness is measured after 10 minutes by removing the weight, and the thickness relative to the thickness before the load is applied is determined. Measure the percentage of thickness after unloading. (2) Fit and shape followability A three-dimensional knitted fabric is sewn into a cylindrical shape with a diameter of 8 cm and a length of 20 cm, and is fitted to the elbow, and the fit to the arm and the ease of bending the elbow (shape followability) are determined by a sensory test. , ：: very good, ：: good, Δ: slightly poor, ×: very poor. Example 1 18 gauge equipped with 6 reeds, 5 mm between pots
180 d of polytrimethylene terephthalate fiber monofilament yarn is supplied as a connecting yarn from two intermediate reeds (L3, L4) using a double Raschel machine, and two reeds (L1, L1 L2), a 150d / 32f polyester multifilament yarn is used as the surface knitting yarn, and two reeds (L
5, L6), as a yarn for the back knitting fabric, a polyester multifilament yarn of 150d / 32f is supplied to the guide in an arrangement of 1 in 1 out, and is driven in at 22 courses / inch. A three-dimensional knitted mesh was obtained. After the three-dimensional knitted fabric was scoured at 70 ° C., it was set in a tentering heat setting (180 ° C.) to obtain a three-dimensional knitted fabric having the properties shown in Table 1. (Knitting structure) L1: 1011/1211/1011/1211/10
11/1222/2322/2122/2322/21
22/2322/2111 / L2: 2322/2122/2322/2122/23
22/2111/1011/1211/1011/12
11/1011/1222 / L3: 1010/1212/1010/1212/10
10/1212/2323/2211/2323/21
21/2323/22121 / L4: 2323/21211/2323/2212/123
23/2121/10/12/12/10/12
12/10/12/1212 / L5: 1110/1112/1110/1112/11
10/1112/2223/2221/2223/22
21/2223/22211 / L6: 2223/2221/2223/2221/22
23/221/1110/1112/1110/11
12/1110/1112 / The obtained three-dimensional knitted fabric had very good compressive elasticity recovery, and also had good fit and shape followability. Example 2 A three-dimensional knitted fabric having the properties shown in Table 1 was obtained in the same manner as in Example 1 except that the driving was changed to 18 courses / inch. The obtained three-dimensional knitted fabric had good compressive elasticity recovery, and very good fit and shape followability. [Comparative Example 1] In Example 1, 180d was used as the connecting yarn.
A three-dimensional knitted fabric having the properties shown in Table 1 was obtained in the same manner as in Example 1, except that the nylon 6 monofilament yarn was used. Although the obtained three-dimensional knitted fabric had good compression elastic recovery, it was slightly inferior in fit and shape followability. Comparative Example 2 In Example 2, 180d was used as the connecting yarn.
A three-dimensional knitted fabric having the properties shown in Table 1 was obtained in the same manner as in Example 2, except that the nylon 6 monofilament yarn was used. The obtained three-dimensional knitted fabric had good fit properties and shape followability, but was somewhat inferior in compression elastic recovery. Comparative Example 3 A three-dimensional knitted fabric having the properties shown in Table 1 was obtained in the same manner as in Example 1, except that a 90d nylon 6 monofilament yarn was used as the connecting yarn. The obtained three-dimensional knitted fabric had very good fit and shape followability, but was slightly inferior in compression elastic recovery. Comparative Example 4 In Example 1, 180d was used as the connecting yarn.
In the same manner as in Example 1 except that the polyethylene terephthalate monofilament yarn was used, a three-dimensional knitted fabric having the properties shown in Table 1 was obtained. The obtained three-dimensional knitted fabric was slightly inferior in compression elasticity recovery, and very poor in fit and shape followability. [Comparative Example 5] In Example 2, 180d was used as the connecting yarn.
In the same manner as in Example 2 except that the polyethylene terephthalate monofilament yarn was used, a three-dimensional knitted fabric having the properties shown in Table 1 was obtained. The obtained three-dimensional knitted fabric was very poor in compression elasticity recovery, and a little inferior in fit and shape followability. [Table 1] According to the present invention, there is provided a three-dimensional knitted fabric which is excellent in fitting property and shape following property without impairing the compressive elasticity recovering property.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) D04B 21/14-21/18 D04B 1/00

Claims (1)

(57) [Claim 1] A three-dimensional knitted fabric composed of a front and back two-layer knitted fabric and a connecting yarn for connecting the two-layer knitted fabric, wherein the connecting yarn is
Constructed from 20 to 500 denier polytrimethylene terephthalate monofilament yarn , three-dimensional knitting
The total cross-sectional area of the connecting yarn in the object 5 square centimeters is 0.05
cm ² or more, 1.0 cm ² or less, the thickness is ² to 20 mm
Solid knitted fabric, characterized in that it.