JP2002294539A - Uneven surfaced three dimensional knitted fabric and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent three dimensional knitted fabric hardly causing sweatiness, excellent in accuracy in its unevenness, abrasion resistance and also cushioning property, and also not requiring a special treating process. SOLUTION: This uneven-surfaced three dimensional knitted fabric consisting of ground textures 18, 17 and a linking yarn, is provided by forming a third ground texture 19 so as to be knitted for having connecting points N having a gap with the above ground textures along with the knitting direction at the inside of at least one of the ground textures, and forming the ground texture as a swollen state by making the tension of the knitting yarn constituting the above third ground texture larger than that of the ground yarn constituting the corresponding ground texture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional knitted fabric having an uneven shape, and more particularly to a three-dimensional knitted fabric having excellent shape retention and cushioning properties which can be used for industrial materials such as chair upholstery and vehicle interior materials. . (Shoes, sportswear,
Living materials such as bedding and bra cup materials)

[0002]

2. Description of the Related Art Today, in the field of clothing, interior materials and vehicle interior materials, products having a three-dimensional pattern (irregular pattern) on the surface are considered to be high-quality and excellent in design.
Its demand is growing. By the way, the three-dimensional pattern on the surface,
In particular, various methods for forming a concave pattern have been developed.

For example, a method of cutting a pile into an appropriate length in a napping fabric, a mechanical embossing method in which a part of fibers of a fiber product is pressed by mechanical means to deform the fibers and heat set (fixed) as they are, There is a chemical embossing method of swelling, shrinking, dissolving or carbonizing some fibers of a fiber product by chemical means. Among them, as an example of the chemical embossing method, see Japanese Patent Application Laid-Open No. 55-1327.
No. 84 discloses a method in which a printing paste containing a resin, a dye or a pigment, and a discharge agent is printed, and the entire surface is flattened and washed with a hot-pressing roll to form a textured pattern.
No. 81 discloses a concavo-convex printed fabric which has been subjected to a simultaneous weight-reduction coloring process. Both have the advantage that they can be expressed by combining a three-dimensional pattern and a colored pattern. There is also a resin printing method in which a resin is printed in a three-dimensional structure on a base cloth to form a three-dimensional structure.

[0004]

However, each of the above-mentioned conventional techniques has the following problems. First, in a method of cutting a pile, it is difficult to form a three-dimensional pattern with high accuracy. Also, in the mechanical embossing method, it is necessary to produce an engraving roll, so it lacks the flexibility of the pattern pattern, lacks the flexibility of adjusting the partial concave depth, and the color expression of the concave pattern part There are drawbacks such as being limited to a single color in most cases.
Further, since the fabric is inserted between the heating rolls under heavy pressure, the texture hardening and the flattening of the fabric are extremely large, and there is a defect that the hot roll causes metallic luster and sometimes thermal discoloration.

On the other hand, in the chemical embossing method, a sufficient concave effect cannot be obtained depending on an object, so that the application range is limited, and it is necessary to strictly select a treatment agent depending on the material of the object.

Further, in Japanese Patent Application Laid-Open No. 55-132784, since a polyacrylate emulsion is used as a self-crosslinking thermoplastic resin, a high temperature and a high pressure are required to make the fabric uneven. Therefore, the non-printed portion is also flattened, and once set at a high temperature, the flattened non-printed portion is not recovered by the cleaning treatment, and sufficient unevenness cannot be obtained. Further, since the water resistance of the acrylic resin is not sufficient, the printed portion is liable to be worn by washing, which is not suitable for industrial materials such as chair materials which require sufficient abrasion resistance. Further, Japanese Patent Application Laid-Open No. Sho 56-1189
No. 81 uses dangerous chemicals such as sulfuric acid and caustic soda, so there is a danger, and it is necessary to take measures against environmental problems.
In the resin printing method, it is difficult to form large irregularities having a large difference in elevation, and there is a problem in abrasion strength.

[0007] From the above, as a method for efficiently providing a three-dimensional knitted fabric only by a knitting structure without requiring an extra step such as pre-processing or post-processing, for example, a method called tuck knitting or rib knitting is used. And a three-dimensional knitting method in which an opening is provided in a three-dimensional knitted mesh fabric to form pseudo irregularities. However, in the case of the knitting method, tack knitting and rib knitting become less uneven when the fabric is pulled in the knitting direction and have poor cushioning properties. In the three-dimensional knitting method, since the connecting yarn is scraped out from the opening at the time of pressing, the cushioning property is reduced and the appearance is not good.

As described above, in each of the conventional methods, when a concavo-convex pattern is formed, there are generally problems in terms of concavo-convex accuracy and abrasion resistance. Furthermore, cushioning properties (so-called compression resistance) have not always been satisfactory as industrial materials. In addition, no matter how the three-dimensional knitted fabric is used, for example, when it is used for a chair upholstery material or a car seat material, when it is pressed by a human body, there is a drawback that the portion that comes into contact with the skin surface increases and it is easily stuffy. The present invention is to solve the above problems.

[0009] That is, an object of the present invention is to provide a three-dimensional knitted fabric which is not easily stuffy and furthermore has excellent irregularity accuracy, abrasion resistance and cushioning properties. Another object of the present invention is to provide an excellent three-dimensional knitted fabric that does not require a special processing step.

[0010]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies and have found that in a knitting method that does not require a special processing step, a conventional knitting structure is interposed between a ground structure and a conventional knitting structure. By knitting a unique third ground structure, it was found that a three-dimensional knitted fabric having an excellent concavo-convex pattern was obtained, and this finding led to the completion of the present invention.

That is, the present invention provides (1) a three-dimensional knitted fabric comprising a front and back ground structure and a connecting yarn, wherein at least one of the ground structures is spaced apart from the ground structure along the knitting direction. A third ground structure knitted so as to have a joining point is formed, and the tension of the knitting yarn constituting the third ground structure is made larger than the tension of the ground yarn forming the corresponding ground structure, and the ground structure is reduced. It is present in the uneven three-dimensional knitted fabric which is in a state of being swollen.

[0012] (2) The three-dimensional knitted fabric has a large or small junction space.

(3) At least one of the front and back ground structures is present in the uneven three-dimensional knitted fabric having an opening.

Further, (4) the swelling ground structure exists in the uneven three-dimensional knitted fabric having the opening.

[0015] Also, (5) a three-dimensional knitted fabric used for an automobile interior material.

(6) A method for producing a three-dimensional knitted fabric comprising a front and back ground structure and a connecting yarn, wherein at least one ground structure has a joint point spaced from the ground structure. The knitting yarn constituting the third ground structure is made larger in tension than the yarn supply tension of the ground yarn forming the ground structure during knitting. Swelling of the three-dimensional knitted fabric.

Further, (7) a method for producing a three-dimensional uneven knitted fabric in which the degree of swelling of the ground structure is changed by changing the yarn feeding tension of the knitting yarn.

Further, (8) the present invention resides in a method for producing an uneven three-dimensional knitted fabric, wherein the knitting yarn is supplied with a tension of at least twice that of the ground yarn constituting the ground structure.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The uneven three-dimensional knitted fabric of the present invention is formed by knitting a third ground structure 19 below a surface structure 18 at regular intervals, as shown in FIG. A bulge is formed in accordance with. Here, it is a matter of course that the third ground structure is knitted below the lining structure at a constant interval, so that the bulging portion may be formed in accordance with the interval. This interval is the interval (AB interval) of the joint point N where the third ground structure and the outer fabric structure are intertwined,
By changing this interval, the size (curvature) of the bulging part
Can be changed. When knitting (knitting in the course direction), the third ground structure has a yarn feeding tension (for example, the tension value in FIGS. 7 to 12) of the knitting yarn larger than that of the surface material structure 18 in order to knit it (strongly). To form).

Since the third ground structure 19 pulls the lower portion of the surface structure, the ground structure is shortened in the knitting direction, that is, the course direction, and is formed into a bulging convex portion having a constant curvature. It is. Here, in the three-dimensional knitted fabric of the present invention, since the front and back fabrics are connected by the connection yarns A3, the one fabric fabric tends to follow the bulging in order for one fabric fabric to bulge. preferable.

For example, a surface material 18 shown in FIG.
And the backing structure 17 are knitted at the same time, and thereafter, the stitches of the dressing structure 18 are shrunk along the course direction by the knitting yarn A4, so that the stitches of the dressing structure 18 are shorter than those of the backing structure 17. That is, the lining structure 17 cannot follow the dressing structure 18, causing wrinkles and uneven thickness.
For this reason, it is preferable that the outer fabric is designed to have the opening S (the connection between the yarns is disconnected to increase the loop gap). However, forming the opening S in the lining tissue so that the lining tissue 17 follows also has a certain effect.

In such a three-dimensional knitted fabric, by changing the structure of the third ground structure, the joining point N intertwined with the surface structure is changed.
Can be adjusted, so that the size of the so-called bulging convex portion can be changed. In other words, it is possible to cause the bulges in the course direction to appear alternately with the large protrusions and the small protrusions, or to make only one of them appear.

As described above, in the method for manufacturing a three-dimensional knitted fabric according to the present invention, the yarn feeding tension of the knitting yarn A4 constituting the third ground structure is made smaller than the yarn feeding tension of the ground yarn having the surface structure in order to swell the ground structure. It is essential to increase. Here, it has been experimentally found that applying a tension twice or more that of the ground yarn to the knitting yarn A4 in order to give a swollen height difference becomes extremely useful as an industrial material.

The uneven three-dimensional knitted fabric and the method for producing the same according to the present invention can be realized by using a warp knitting machine having a double-row needle bed. FIG. 1 shows a warp knitting machine (double Raschel knitting machine) having a double-row needle bed for knitting the uneven three-dimensional knitted fabric of the present invention. G1 to G6 are guides for introducing a knitting yarn, 7 is a needle pot having a lining structure, 8 is a needle pot having a surface material structure, and 9 and 10
Is a knitting needle for knitting a front and back fabric. 11-16
Represents a beam wound with a knitting yarn. Knitting yarn A1-A
6, A1 and A2 are so-called ground yarns, and L1 and L2
Through the reed and the guides of G1 and G2
To organize.

A5 and A6 are also ground yarns, and are threaded through L5 and L6 reeds and G5 and G6 guides to knit a surface fabric 18. A3 is a connecting yarn, which passes through the L3 reed and the G3 guide to connect the two opposite ground structures 17, 18 to knit a three-dimensional knit. A4 is a knitting yarn which is passed through the L4 reed and the G4 guide and knitted below (inside) the outer fabric 18. The ground structure knitted by the knitting yarn of A4 is the third ground structure referred to in the present invention.

The knitting yarn A4 is located inside the outer fabric 18 and is knitted 18 at regular intervals. Knitting yarn A
4 are knitted by the guide G4 with respect to the outer fabric 18 at an interval inside the knitting of the outer fabric 18. Knitting yarn A4 forming a third ground structure inside the outer material structure 18
Is limited so that the amount of yarn supplied is smaller than that of the outer fabric, and tension is applied between the joining points, so that when the knitted fabric is released from the knitting machine, The outer surface structure 18 of the part bulges to form a convex part.

FIG. 2 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of the present invention, which is a top structural view (perspective view) and a side structural view (course sectional view), respectively. In the course direction cross-sectional view, the knitting yarn A4 is inside the surface fabric 18 of the uneven three-dimensional knitted fabric, and indicates that knitting is repeated while forming joint points with the ground fabric at specific intervals. Here, knitting yarn A
4 is shorter than the length of the surface structure 18 in the course direction, and the third ground structure is formed by joining the ground structure 18 in the course direction at the junction inside the surface structure 18. Pulling to shrink. That is, since the tension of the knitting yarn A4 is larger than the tension of the other ground structure, the knitting yarn A4 acts to pull the joint points between the surface structure and the third ground structure. As a result, the outer material structure 18 forms a bulged convex portion having a curvature on the outside.

In the case where the opening S is formed in the course direction of the convex portion in the surface fabric, a concave shape is obtained not only in the course direction but also in the well direction. Unevenness can be formed.
By forming the unevenness in the course direction and the well direction in this way, there is an advantage that unevenness in a welder processing tone is formed.

The three-dimensional knitted fabric used in the present invention is not particularly limited irrespective of warp knitting such as tricot or raschel, or weft knitting such as circular knitting. Is preferred. In that respect, the double raschel is particularly preferable because it can form a three-dimensional knitted fabric excellent in cushioning property and shape retention. The yarn constituting the ground structure is not particularly limited, such as a multifilament or a monofilament, and the form of the yarn is not particularly limited, such as a covering yarn, a shrinkable yarn, or a crimped yarn having a core-sheath structure.

On the other hand, the connecting yarn is not particularly limited, but a monofilament is preferred from the viewpoint of cushioning properties. Natural fiber, regenerated fiber,
Semi-synthetic fibers, synthetic fibers, or a combination thereof can be used, but synthetic fibers are preferred from the viewpoint of cushioning properties or wear resistance. Particularly, when the present invention is applied to vehicle interior materials, they have excellent durability. Polyester fibers are preferred.

In the uneven three-dimensional knitted fabric of the present invention, the number of connecting yarns per unit area is greatly increased after knitting by the third ground structure as compared with a normal three-dimensional warp knitted fabric knitted with the same gauge. It will be extremely rich in sex. In addition, since the surface of the ground tissue is bulging (in detail, the curvature is drawn), the contact area with the human body (skin surface) becomes small, allowing air to intervene, and making it hard to stuffy. In addition, since a bulge-like repetition in the course direction is formed and a concave portion in the well direction is formed, a complicated geometric pattern can be formed in terms of design, so that the aesthetic appearance is improved. .

Due to such features, the three-dimensional knitted fabric of the present invention is useful when used as an industrial material, particularly as an interior material for automobiles.

In the present invention, the knitted three-dimensional knitted fabric may be subjected to post-processing such as dyeing (including printing), washing and drying, or may be knitted in advance using original yarn.
Of course, knitting and dyeing using two or more types of materials, for example, knitting with a combination of polyester and acrylic, and dyeing with a disperse dye and a cationic dye may be used. By these processes, for example, a three-dimensional knitted material in which the concave portions and the convex portions are colored in different colors can be obtained.

Further, a suede-like three-dimensional knitted fabric having a three-dimensional pattern may be formed by raising or buffing the ground texture surface so that only the convex portions are fluffed.

By these treatments, it is possible to obtain a suede-like three-dimensional knitted fabric in which, for example, the convex portions are fluffed in a suede-like manner.

[0036]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the examples. [Evaluation Method] The following examples were evaluated by the following evaluation methods.

(1) Unevenness feeling The surface roughness of the cloth under test was measured using a surface tester (KES-FB4: manufactured by Kato Tech Co., Ltd.).
The evaluation was made based on the average deviation value of the unevenness and the maximum value of the concave and convex portions.

(2) Abrasion Resistance The cloth to be tested was measured according to JIS-L1096 [wear strength C method (Taber-type method)]. The conditions were as follows: the wear wheel was CS-10, the load was 4.9 N, and the number of times was 1,000. The state of the test cloth after the test was visually evaluated according to the following evaluation items. …: No change from before the test is observed.…: Fuzz is observed on the surface as compared to before the test. ×: The surface is fluffed compared to before the test, and the connecting yarn is scraped.

(3) Compression Resistance (Test for Confirming Retention of Thickness) The cloth to be tested was measured to have a size of 7 cm × 7 cm. On top of this, place a 5 kg cylindrical weight with a diameter of 7 cm, and in this state,
It was left at 100 ° C. for 2 hours so that the thickness was easily changed. Two hours later, the thickness immediately after removing the weight was defined as the thickness L2 after the test. The thickness retention was determined by the following equation. Thickness retention (%) = L2 / L1 × 100

[0040]

Example 1 Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer), a three-dimensional knitted fabric with irregularities was knitted under the conditions shown in FIG. The finished knit was an uneven knit having a total thickness of 4.0 mm. FIG. 3 is a top structural view (perspective view) and a side structural view (course sectional view) of the uneven knitted fabric. On the surface texture, bulging convex portions having a constant curvature are repeatedly formed. Table 1 shows the evaluation results of the products.

[0041]

Example 2 Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer), a three-dimensional knitted fabric having irregularities was knitted under the conditions shown in FIG. The finished knit was an uneven knit having a total thickness of 4.0 mm. FIG. 4 is a top structural view (perspective view) and a side structural view (course direction sectional view) of the uneven knitted fabric. On the surface ground structure, bulging convex portions having a large curvature and bulging convex portions having a smaller curvature are alternately formed at intervals of the joining point N. This interval is two types of intervals, AB interval and BC interval. Table 1 shows the evaluation results of the products.

[0042]

Example 3 Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer Corporation), a three-dimensional knitted fabric having irregularities was knitted under the conditions shown in FIG. The finished knit was an uneven knit having a total thickness of 4.0 mm. FIG. 5 is a top view (perspective view) and a side view (course direction sectional view) of the uneven knitted fabric. Swelled convex portions having a constant curvature are repeatedly formed in the surface texture, and openings S are formed in the surface texture to cross the convex portions in the course direction. Table 1 shows the evaluation results of the products.

[0043]

Embodiment 4 Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer) under the conditions shown in FIG.
An uneven three-dimensional knit was knitted. The finished knit was an uneven knit having a total thickness of 4.0 mm. FIG. 6 is a top structural view (perspective view) and a side structural view (course direction sectional view) of the uneven knitted fabric. In the surface texture, bulging convex portions having a constant curvature are repeatedly formed, and in the surface texture, a number of relatively small openings S are formed. Table 1 shows the evaluation results of the products.

[0044]

[Comparative Example 1] Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer) under the conditions shown in FIG.
We knit a three-dimensional knit. The finished knitted fabric had a total thickness of 4.0 mm and had no unevenness. Table 1 shows the evaluation results of the products.

[0045]

Comparative Example 2 30 parts of acrylic resin (manufactured by Dainippon Ink and Chemicals, Inc .: Boncoat AD-350) and 40 parts of ethylene vinyl acetate resin (manufactured by Shoei Chemical Industry Co., Ltd.) were added to the three-dimensional knitted fabric obtained in Comparative Example 1. AD-912), foaming agent
13 parts (Matsumoto Yushi Pharmaceutical Co., Ltd .: Matsumoto Microsphere F-100), CMC 3 parts (Daiichi Kogyo Seiyaku Co., Ltd .: Fine Gum HE), 10 parts of aqueous pigment (Toyo Ink Co., Ltd .: Black K-) 7), a processing solution composed of 4 parts of water ｛viscosity: 20,000 cps (B-type viscometer:
No. 4 × 12 rpm) was applied using a rotary screen printing machine. Further, a three-dimensional knitted foam print was obtained through drying and curing processes. The applied amount of the treatment liquid was 80 g / m ² . The obtained uneven three-dimensional knitted fabric was evaluated according to the above evaluation method. Table 1 shows the evaluation results of the products.

[0046]

[Comparative Example 3] Using a double Raschel machine RD6DPLM-22G (manufactured by Meyer) under the conditions shown in FIG.
A mesh solid knit was knitted. The finished knit was a mesh knit having an overall thickness of 4.0 mm. Table 1 shows the evaluation results of the products.

[0047]

[Table 1]

[0048]

As described above, the three-dimensional knitted fabric having the concavo-convex pattern obtained by the present invention is not easily stuffy, and furthermore has excellent concavo-convex accuracy, abrasion resistance, and cushioning property, and requires a special treatment step. do not do.

That is, since it has excellent cushioning properties and abrasion resistance, it can be suitably used even in harsh environments such as automobile interior materials, and requires fewer steps than the conventional three-dimensional pattern forming method. It is also advantageous in terms of cost.

Further, when forming the concavo-convex pattern, it is not necessary to use harmful chemicals and the like, so it is friendly to workers and the environment, and the material to be processed is not particularly limited. There is no sacrifice. Furthermore, a three-dimensional structure with a large difference in elevation can be obtained without using welding or embossing, and the size of the three-dimensional knitted fabric can be controlled by variously devising the ground structure of the three-dimensional knitted fabric. And when applied to a vehicle seat, it is a knitted fabric having an appropriate hold feeling and a very comfortable design that is less likely to feel stuffy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of an apparatus for knitting a three-dimensional uneven knitted fabric according to the present invention.

FIG. 2 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of the present invention, and is a top view and a side view, respectively.

FIG. 3 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of Example 1, which is a top view and a side view, respectively.

FIG. 4 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of Example 2, which is a top view and a side view, respectively.

FIG. 5 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of Example 3, which is a top view and a side view, respectively.

FIG. 6 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of Example 4, which is a top view and a side view, respectively.

FIG. 7 is a schematic cross-sectional view of the uneven three-dimensional knitted fabric of Example 1, which is a top view and a side view, respectively.

FIG. 8 is an organization diagram showing the structure of the uneven three-dimensional knitted fabric of Example 2.

FIG. 9 is an organization diagram showing the structure of the uneven three-dimensional knitted fabric of Example 3.

FIG. 10 is an organization diagram showing a structure of a concave-convex three-dimensional knitted fabric of Example 4.

FIG. 11 is an organization diagram showing a structure of the uneven three-dimensional knitted fabric of Comparative Example 1 and Comparative Example 2.

FIG. 12 is an organization diagram showing a structure of a three-dimensional uneven knitted fabric of Comparative Example 3.

[Explanation of symbols]

 A1 ... knitting yarn A2 ... knitting yarn A3 ... knitting yarn (connecting yarn) A4 ... knitting yarn A5 ... knitting yarn A6 ... knitting yarn L1 ... reed L2 ... reed L3 ... reed L3 ... reed L4 ... reed L6 ... reed G1 ... guide G2 … Guide G3… guide G4… guide G5… guide G6… guide 7… lining tissue side needle hook 8… outer fabric tissue side needle hook 9… lining fabric tissue side knitting needle 10… outer fabric tissue side knitting needle 11… beam 12… beam 13… beam 14 ... Beam 15 ... Beam 16 ... Beam 17 ... Back ground texture (lining texture) 18 ... Front ground texture (surface texture) 19 ... Third ground texture N ... Junction point S ... Opening

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukito Kaneko 1-10-1 Kiya, Fukui-shi, Fukui Prefecture F-term (reference) 4L002 AA05 AA07 AB02 CA01 CB01 EA00 FA01 FA02 FA03 FA06 4L054 AA02 BB01 BB10 BD05 BD07 FA03 NA07

Claims (8)

[Claims] 1. A three-dimensional knitted fabric comprising a front and back ground structure and a connecting yarn, knitted so as to have a joining point spaced from the ground structure along a knitting direction inside at least one ground structure. A state in which a third ground structure is formed and the ground structure is formed in a swollen state because the tension of the knitting yarn constituting the third ground structure is higher than the tension of the ground yarn forming the corresponding ground structure. An uneven three-dimensional knitted fabric characterized in that: 2. The uneven three-dimensional knitted fabric according to claim 1, wherein the distance between the joining points is large or small. 3. The uneven three-dimensional knitted fabric according to claim 1, wherein at least one of the front and back ground structures has an opening. 4. The uneven three-dimensional knitted fabric according to claim 1, wherein the swelling ground structure has an opening. 5. The uneven three-dimensional knitted fabric according to claim 1, wherein the three-dimensional knitted fabric is used for an automobile interior material. 6. A method for producing a three-dimensional knitted fabric comprising front and back ground structures and connecting yarns, wherein a third ground is provided inside at least one ground structure so as to have a joint point spaced from the ground structure. Knitting a texture, and, at the time of knitting, expanding the ground texture by making the yarn feeding tension of the knitting yarn constituting the third ground texture greater than the yarn feeding tension of the ground yarn configuring the ground texture. A method for producing a three-dimensional knitted fabric having irregularities. 7. The method according to claim 6, wherein the degree of bulging of the ground structure is changed by changing the yarn feeding tension of the knitting yarn. 8. The method according to claim 6, wherein the knitting yarn is supplied with a tension twice or more that of the ground yarn constituting the ground structure.