JP7152108B2 - double raschel knitted fabric - Google Patents

Description

The present invention relates to a double raschel knitted fabric.

2. Description of the Related Art Conventionally, a double raschel knitted fabric in which a front fabric structure and a lining structure are connected by a connecting part made of a connecting yarn, and in which a large number of openings are formed in the outer structure and the lining structure is known. For example, in the invention of Patent Document 1, such an opening functions as a vent. Generally, such an opening is formed by a knitted structure and penetrates the outer fabric structure and the lining structure of the double raschel knitted fabric.

However, the formation of the openings reduces the strength of the double raschel knitted fabric. Further, if the double raschel knitted fabric having openings is used for a long period of time, the strength of the ground structure having the openings may be further reduced.

Attempts have been made to improve the strength not only of double raschel knitted fabrics but also of warp knitted fabrics in general. For example, in Patent Document 2, "A cloth spring material made of a warp knitted fabric in which 95 wt% or more is composed of multifilaments, the ground structure of the warp knitted fabric is composed of at least three reeds, and at least one reed is used. The reeds form a chain stitch, at least two reeds form a tricot stitch with one or more stitches and eight stitches or less, and the at least two reeds forming the tricot stitch are swayed in opposite directions, A warp-knitted cloth spring material characterized in that the relationship between the number of courses (C) and the number of wells (W) of the structure satisfies 0.8W≤C≤1.5W. According to the description of Patent Document 2, the warp-knitted fabric spring material having this feature has high surface rigidity and high strength.

JP 2016-43062 A JP 2013-7143 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a double raschel knitted fabric having excellent strength despite having openings.

さらに、前記裏地組織が、コード編組織と、デンビ編組織および／または鎖編組織との組合せであり、前記裏地組織を形成するコード編組織のニードルループと、前記裏地組織を形成するデンビ編組織および／または鎖編組織のニードルループとが、異方向にオーバーラップしてニードルループを形成していることを特徴とする。
The double raschel knitted fabric of the present invention is a double raschel knitted fabric consisting of a front and back fabric structure and a connecting portion that connects them, the front fabric structure has openings, and the lining structure is calculated by the following calculation formula: The total fineness of overlapping sinker loops is 400 to 1800 dtex ,

Further, the lining structure is a combination of a cord knitting structure and a denim knitting structure and/or a chain knitting structure, and the needle loops of the cord knitting structure forming the lining structure and the denim knitting structure forming the lining structure. and/or the needle loops of the chain stitch structure are overlapped in opposite directions to form needle loops.

The double raschel knitted fabric of the present invention has excellent strength in spite of having openings in the outer fabric because the total fineness of overlapping sinker loops in the lining fabric is 400 to 1800 dtex.

FIG. 4 is a diagram illustrating openings in the outer fabric; FIG. 4 is a diagram for explaining the number of overlapping sinker loops when the lining fabric is composed of two Denbi knitted fabrics. FIG. 5 is a diagram for explaining the number of overlapping sinker loops when the lining fabric is composed of a denim knitting structure and a two-needle swing cord knitting structure. FIG. 5 is a diagram for explaining the number of overlapping sinker loops when the lining fabric is composed of a denim knitting structure and a three-needle swing cord knitting structure. FIG. 10 is a diagram for explaining the number of overlapping sinker loops when the lining structure is composed of two Denbi knitting structures and a three-needle swing cord knitting structure, and the two Denbi knitting structures have different underlap directions. Sectional drawing of a double raschel knitted fabric. FIG. 2 is a view of the knitting section of the double raschel knitting machine viewed from the side (the same direction as the direction in which the knitting needles are arranged). Organization chart of Example 1. Organization chart of Example 2. Organization chart of Example 3. Organization chart of Example 4. Organization chart of Example 5. Organization chart of Example 6. Organization chart of Example 7. Organization chart of Example 8. Organization chart of Example 9. Organization chart of Example 10. The organizational chart of Comparative Example 1. The organizational chart of Comparative Example 2. The organizational chart of Comparative Example 3. The organizational chart of Comparative Example 4. The organizational chart of Comparative Example 5. The organizational chart of Comparative Example 6.

The double raschel knitted fabric of the present invention will be described below. In the following description, when a range is expressed as "(numerical value) to (numerical value)", the numerical values on both sides of the range are included in the range. Also, in the following description, "A and B", "A", and "B" may be collectively expressed as "A and/or B".

A double raschel knitted fabric is a type of warp knitted fabric and has a front and back fabric design, that is, a front fabric design and a lining design. The double raschel knitted fabric further has connecting portions that connect the outer fabric structure and the lining structure. The connecting portion is formed by a connecting thread.

In the double raschel knitted fabric of the present invention, the outer fabric structure has openings. The opening is formed by a knitted structure and penetrates the outer fabric in a direction perpendicular to its surface. Apertures are formed at locations where adjacent loops are not connected in the weft direction, such as locations indicated by double-dotted lines H in FIG. Note that FIG. 1 shows a knitting structure by two reeds, and yarns are arranged in 3-in-3-out on each of these two reeds. In FIG. 1, the solid line indicates the design of yarn fed from one reed, and the dashed line indicates the design of yarn fed from another reed. The knitting structure of the outer fabric structure having openings is not limited, but may be, for example, a net structure made of yarns fed from two reeds. A specific configuration of the outer material structure having openings will be described later.

Furthermore, in the double raschel knitted fabric of the present invention, the total fineness of overlapping sinker loops in the lining fabric is 400 to 1800 dtex. Here, the total fineness of overlapping sinker loops in the lining fabric is calculated by the following formula.

In this calculation formula, the base thread is the thread forming the lining fabric. The number of underlaps of ground yarns means the number of underlaps of ground yarns in the lining fabric. A reed is a reed used for knitting the lining fabric, and n is the number of reeds used for knitting the lining fabric. The threading ratio of the reed is the ratio of the number of guides through which the thread is threaded to the total number of guides of the reed. For example, when a full set of yarns is supplied to the reed, the thread ratio is 1.00, when 2 in 2 out or 3 in 3 out of yarn is supplied to the reed, the thread ratio is 0.50, and 3 in 1 out of the yarn is supplied to the reed. The threading ratio is 0.75 when the yarn is fed to the reed, and the threading ratio is 0.25 when the yarn is fed to the reed at 1 in 3 out.

According to the above calculation formula, for example, when the lining fabric is made of yarn fed from a single reed,
Overlapping total fineness of sinker loop (dtex)
= fineness (dtex) of ground thread x number of underlaps of ground thread x thread ratio of reed. Further, for example, when the lining fabric is made of yarn fed from two reeds,
Overlapping total fineness of sinker loop (dtex)
= Fineness of base yarn supplied from the first reed (dtex)
× Number of underlaps of base yarn supplied from the first reed
× Thread ratio of the first reed
+ Fineness of base yarn supplied from the second reed (dtex)
× Number of underlaps of base yarn supplied from the second reed
× It becomes the threading ratio of the 2nd reed. Further, for example, when the lining fabric is made of yarn fed from three reeds,
Overlapping total fineness of sinker loop (dtex)
= Fineness of base yarn supplied from the first reed (dtex)
× Number of underlaps of base yarn supplied from the first reed
× Thread ratio of the first reed
+ Fineness of base yarn supplied from the second reed (dtex)
× Number of underlaps of base yarn supplied from the second reed
×2nd reed thread ratio
+ Fineness of base yarn supplied from the third reed (dtex)
× Number of underlaps of base yarn supplied from the third reed
× It becomes the threading ratio of the 3rd reed.

In the present invention, the fineness of the ground threads in the lining fabric, the number of underlaps of the ground threads, and the number of reeds used for knitting the lining fabric are adjusted so that the total fineness of overlapping sinker loops in the lining fabric falls within the above range. It is determined. A specific configuration of the lining fabric including the fineness of the ground thread will be described later.

As described above, when the total fineness of overlapping sinker loops in the lining fabric is 400 to 1800 dtex, the double raschel knitted fabric has excellent strength in spite of having openings in the outer fabric fabric. Here, the strength exhibiting particularly excellent properties includes bursting strength, tensile strength, tearing strength and seam fatigue.

When the total fineness of overlapping sinker loops of the lining fabric is 400 dtex or more, the double raschel knitted fabric has excellent strength as listed above. In addition, since the total fineness of overlap of the sinker loops of the lining fabric is 1800 dtex or less, the double raschel knitted fabric has flexibility and elongation properties, and as a result, workability such as sewability and stretchability is improved.

More preferably, the total fineness of overlapping sinker loops of the lining fabric is 500 to 1600 dtex. As a result, the above effects of the double raschel knitted fabric become more excellent.

The overlapping total fineness of the sinker loops in the outer fabric is also calculated by the above formula. In the calculation of the total fineness of overlapping sinker loops in the outer fabric structure using the above calculation formula, the base yarn is the yarn that forms the outer structure, and the number of underlaps of the base yarn is the underlap of the base yarn in the outer structure. A reed is a reed used for knitting the surface fabric.

The sum of the total overlapping fineness of the sinker loops of the outer material structure and the total overlapping fineness of the sinker loops of the lining structure (hereinafter referred to as the "sum of the total overlapping fineness of the sinker loops of the front and backing structure") is 650 to 2000 dtex. is preferred. When the sum of the overlapping total fineness of the sinker loops of the front and back fabric is 650 dtex or more, the double raschel knitted fabric has excellent strength as listed above. In addition, since the sum of the total fineness of overlapping sinker loops of the front and back fabric is 2000 dtex or less, the double raschel knitted fabric has flexibility and elongation characteristics, and as a result, workability such as sewability and stretchability is good. becomes.

In addition, the total fineness of overlapping sinker loops of the front and back fabric is more preferably 650 to 1700 dtex, and even more preferably 750 to 1600 dtex. When the total fineness of overlapping sinker loops of the front and back fabric is 650 to 1700 dtex, the strength, flexibility and elongation properties of the double raschel knitted fabric are satisfactorily compatible. Further, when the sum of the overlapping total fineness of the sinker loops of the front and back fabric is 750 to 1600 dtex, the strength, flexibility and elongation properties of the double raschel knitted fabric can be achieved at the same time.

Here, the fineness of the yarn used for the double raschel knitted fabric of the present invention is preferably 84 to 550 dtex. When the fineness of the yarn is 84 dtex or more, the double raschel knitted fabric has excellent strength. Further, when the fineness of the yarn is 550 dtex or less, the double raschel knitted fabric has good flexibility and workability such as sewability is good. The material, shape, etc. of the yarn used for the double raschel knitted fabric are not particularly limited.

Here, the single fineness (also referred to as single fiber fineness) of the yarn used in the double raschel knitted fabric of the present invention is preferably 2.3 to 8.3 dtex, more preferably 2.3 to 4.6 dtex. is more preferred. When the yarn has a single fineness of 2.3 dtex or more, the double raschel knitted fabric has excellent strength. In addition, when the single fineness of the yarn is 8.3 dtex or less, the double raschel knitted fabric has good flexibility and workability such as sewability is good. In particular, in the outer texture, the ratio of yarns with the above single fineness (that is, 2.3 to 8.3 dtex or 2.3 to 4.6 dtex) in the entire ground texture (that is, the proportion of all yarns used in the outer texture) A double raschel knitted fabric with good texture can be obtained by setting the ratio of the number of yarns having the above single fineness to the number of yarns) to be 70% or more.

When monofilament yarns and multifilament yarns are used in the double raschel knitted fabric of the present invention, the ratio of the number of monofilament yarns to the total number of yarns used in the double raschel knitted fabric is 8 to 40%. is preferred, and 8 to 30% is more preferred. When the ratio of the number of monofilament yarns is 8% or more, the double raschel knitted fabric has excellent shape retention and strength. Further, when the ratio of the number of monofilament yarns is 40% or less, the flexibility of the double raschel knitted fabric is improved, and the workability such as sewability is improved.

Next, a preferred specific configuration of the front and back fabric structure in the double raschel knitted fabric of the present invention will be described.

First, in the double raschel knitted fabric of the present invention, the lining structure is preferably composed of a plurality of knitted structures. That is, it is preferable that the lining structure is made of yarns fed from a plurality of reeds, and the yarns fed from each reed form a different knitting structure.

In the case where the lining structure is composed of a plurality of knitted structures, if the underlap directions of those knitted structures are different, or if the number of underlaps of those knitted structures is different, the knitted structures are arranged as shown in FIGS. 2 to 5. The tissue sinker loops overlap each other. In the figure, F indicates a knitting course using knitting needles on the front side, and B indicates a knitting course using knitting needles on the back side.

For example, as shown in FIG. 2, the lining structure is composed of two knitting structures, one of which is a Denbi knitting structure indicated by a broken line, and the remaining one is a Denbi knitting structure indicated by a solid line. It is assumed that the wrap directions are different. In this case, the sinker loops intersect and overlap each other as shown in FIG. The number of overlapping sinker loops in the lining fabric of FIG. 2 is two.

Here, the number of overlapping sinker loops of the lining fabric means between one well and between one course in the lining fabric (in other words, two stitches adjacent in the well direction and two stitches adjacent in the course direction in the lining fabric. is the number of sinker loops that overlap within the range enclosed by and (that is, the range enclosed by the two-dot chain lines in FIGS. 2 to 5).

The number of overlapping sinker loops of the lining fabric varies depending on the number of underlaps of the knitting fabric forming the lining fabric, the number of knitting fabrics forming the lining fabric (in other words, the number of reeds forming the lining fabric), and the like.

For example, as shown in FIG. 3, when the lining fabric is composed of a denim knitting structure indicated by a broken line and a cord knitting structure with two stitches indicated by a solid line, the number of overlapping sinker loops of the lining structure is three. Also, as shown in FIG. 4, when the lining structure is composed of a denim knitting structure indicated by a broken line and a three-stitch cord knitting structure indicated by a solid line, the number of overlapping sinker loops of the lining structure is four. Further, as shown in FIG. 5, the lining structure is composed of a Denbi knitting structure indicated by a broken line, a Denbi knitting structure indicated by a dashed line, and a cord knitting structure indicated by a solid line with a three-needle swing. When the wrapping directions are different, the number of overlapping sinker loops of the lining fabric is five.

When the lining structure is composed of a plurality of knitted structures and the sinker loops overlap each other, the average number of overlapping sinker loops of the lining structure is preferably 2 to 10/(well/course).

Here, the average value of the number of overlapping sinker loops of the lining fabric is obtained by calculating the number of overlapping sinker loops at all locations in one pattern of the lining fabric, averaging them and rounding off the decimal point. is the value of The reason for calculating the average in this way is as follows. First, when all the knitting structures constituting the lining structure have a full-set yarn arrangement (in other words, when knitted with reeds fed with a full set of yarns), at any place in the lining structure , the number of overlapping sinker loops is the same. However, when at least one of the knitting structures that make up the lining structure has a yarn arrangement in which the yarn is removed (in other words, when knitting with a reed that has been yarn-extracted and supplied), the lining structure may vary depending on the location. are different in the number of overlapping sinker loops. In this case, the average number of overlapping sinker loops in the lining fabric is related to the strength of the double raschel knitted fabric.

When the average number of overlapping sinker loops in the lining structure is 2/(well/course) or more, the double raschel knitted fabric has excellent strength. Here, bursting strength, tensile strength, tearing strength and seam fatigue are mentioned as strengths exhibiting particularly excellent properties. In addition, the average number of overlapping sinker loops in the lining structure is 10 / (well / course) or less, so that the flexibility and elongation characteristics of the double raschel knitted fabric are secured, and as a result, the sewability and stretchability Workability such as flexibility is improved.

More preferably, the average number of overlapping sinker loops of the lining fabric is 3 to 7 loops/(well course). As a result, the above effects of the double raschel knitted fabric become more excellent.

In addition, when the outer fabric is composed of a plurality of knitting structures and the sinker loops of those knitting structures overlap each other, the average number of overlapping sinker loops of the outer fabric can be obtained by the same method as for the lining fabric. Then, when the sinker loops of a plurality of knitting structures overlap each other in each of the outer fabric and the lining fabric, the average number of overlapping sinker loops in the outer fabric and the average number of overlapping sinker loops in the lining fabric are calculated. The sum is preferably 4 to 15 lines/(well course).

The sum of the average number of overlapping sinker loops of the outer fabric and the average number of overlapping sinker loops of the lining fabric is 4 / (well course) or more, so that the double raschel knitted fabric has strength. will be excellent. Here, bursting strength, tensile strength, tearing strength and seam fatigue are mentioned as strengths exhibiting particularly excellent properties. In addition, since the sum is 15 lines/(well/course) or less, the double raschel knitted fabric has flexibility and elongation characteristics, and as a result, workability such as sewability and stretchability is improved.

More preferably, the sum of the average number of overlapping sinker loops of the outer fabric and the average number of overlapping sinker loops of the lining fabric is 6 to 11 loops/(well course). As a result, the above effects of the double raschel knitted fabric become more excellent.

Next, a case where the lining structure has a cord knitting structure will be described. When the lining structure consists of a plurality of knitting structures, at least one of the plurality of knitting structures is preferably a cord knitting structure. As a result, the number of underlaps in the cord knitting structure can be adjusted to bring the total fineness of overlapping sinker loops in the lining structure within a desired range.

Furthermore, when at least one of the plurality of knitting structures of the lining structure is a cord knitting structure, the remaining knitting structures of the lining structure are preferably dembi knitting and/or chain stitching. That is, the lining structure is preferably a combination of a cord knitting structure and a Denbi knitting structure, a combination of a cord knitting structure and a chain knitting structure, or a combination of a cord knitting structure, a Denbi knitting structure and a chain knitting structure. The double raschel knitted fabric has an excellent balance of elongation in each direction due to the combination of these lining structures. The lining structure may be a combination of one cord knitting structure and one Denbi knitting structure and/or one chain knitting structure. Also, the lining structure may be a combination of a plurality of cord knitting structures and one Denbi knitting structure and/or one chain knitting structure.

In the case where the lining structure is composed of a combination of the cord knitting structure and the dembi knitting structure and/or the chain knitting structure, the needle loops of the cord knitting structure and the needle loops of the dembi knitting structure and/or the chain stitch structure are They may overlap in opposite directions. That is, when the lining structure is a combination of a cord knitting structure and a Denbi knitting structure, the needle loops of these two structures overlap in opposite directions, and when the lining structure is a combination of a cord knitting structure and a chain stitch structure, these needle loops overlap. When the needle loops of two weaves overlap in opposite directions and the lining weave is a combination of a cord weave, a dembi weave, and a chain weave, the needle loops of the cord weave overlap the needle loops of the other two weaves. may overlap in opposite directions. As a result, the base yarn of the cord knitting structure and the base yarn of the dembi knitting structure and/or the chain knitting structure are pulled in the direction opposite to the well direction at the position of the needle loop, and the needle loop is enlarged, resulting in a double raschel knitting. Improves the elasticity of the ground.

Moreover, when the lining structure has at least a combination of a cord knitting structure and a denim knitting structure, it is preferable that the cord knitting structure and the denim knitting structure underlap in the same direction to form a sinker loop. As a result, the double raschel knitted fabric has good elongation in the warp direction, and the double raschel knitted fabric can be easily knitted and processed, and the double raschel knitted fabric is less likely to wrinkle even when the base yarn shrinks.

Further, when the lining structure is composed of a combination of a cord knitting structure and a Denbi knitting structure and/or a chain stitching structure, the needle loops formed by the cord knitting structure are preferably closed stitches. This increases the shape of the needle loop. By increasing the shape of the needle loops, the double raschel knitted fabric has a good balance of elongation in the warp and weft, and the flexibility of the needle loops makes it difficult for the double raschel knitted fabric to wrinkle.

In addition, when the lining fabric is composed of a combination of a cord knitting structure and a Denbi knitting structure and/or a chain stitch structure, the needle loops formed by the Denbi knitting structure and/or the chain stitch structure are preferably open stitches. As a result, the yarn length of the ground yarns forming the denim knitted structure and/or the chain stitched structure is shortened, and the stretch in the weft direction of the double raschel knitted fabric is suppressed, thereby improving the stretch balance.

Further, when the lining structure is composed of a combination of a cord knitting structure and a Denbi knitting structure and/or a chain knitting structure, the cord knitting structure is arranged on the needle loop side of the lining structure, and the Denbi knitting structure is arranged on the sinker loop side of the lining structure. and/or a chain stitch structure is preferably arranged. In general, the cord knitting structure is a structure with good elongation, but with the above arrangement, the sinker loop of the cord knitting structure is suppressed by the Denbi knitting structure, so that the warp and weft elongation can be suppressed.

As described above, when the cord knitting structure is arranged on the needle loop side of the lining structure, and the dembi knitting structure and/or chain stitch structure is arranged on the sinker loop side of the lining structure, the dembi knitting structure and / or The chain stitch structure has a greater effect on the elongation in the warp direction of the double raschel knitted fabric. Therefore, in this case, if the needle loops formed by the dembi knitting structure and/or the chain stitching structure on the sinker loop side are open stitches, the warpwise elongation of the double raschel knitted fabric is suppressed and the elongation balance is improved. It is particularly preferable because the effect becomes remarkable.

Although the case where the lining structure is composed of a plurality of knitting structures has been described above, the lining structure may be formed of only one knitting structure. For example, the lining structure may be formed from a single cord knitting structure.

Regardless of the number of knitting structures that the lining structure has, when the lining structure has a cord knitting structure, the cord knitting structure preferably has 2 to 8 stitches. Thereby, it becomes easy to make the total fineness of overlapping sinker loops of the lining fabric within a desired range. In addition, the double raschel knitted fabric has excellent strength because the cord knitting structure has two needles or more. In addition, since the cord knitting structure is 8 stitches or less, the double raschel knitted fabric has flexibility and elongation characteristics, and as a result, workability such as sewability and stretchability is improved.

When the lining fabric has a cord knitting structure, it is particularly preferable that the cord knitting structure has 3 to 6 stitches. As a result, the above effects of the double raschel knitted fabric become more excellent.

Regardless of the specific configuration of the front and back fabric structure, the angle formed by the front and back fabric structure and the connecting yarn is preferably 30 to 85 degrees when no stress is applied to the double raschel knitted fabric. The angle formed by the front/back fabric structure and the connecting yarn is the angle θ formed between the front/back fabric structures 1 and 2 and the connecting yarn 4 (the angle at the point where the angle is the smallest) shown in FIG. Since the angle formed by the front/back fabric structure and the connecting yarn is 30 degrees or more, even if force is applied to the double raschel knitted fabric in the thickness direction, the double raschel knitted fabric is not easily crushed and the thickness is maintained. In addition, since the angle formed by the front and back fabric structure and the connecting yarn is 85 degrees or less, even if tension is applied to the front and back fabric structure in the weft and weft directions, the connecting yarn will not be greatly displaced and the double raschel knitted fabric will not be distorted. unlikely to occur.

The angle formed by the front/lining fabric and the connecting thread varies for each connecting thread, but the ratio of the connecting threads where the angle between the front/lining fabric and the connecting thread is 30 to 85 degrees (in terms of the number of connecting threads) ratio) is preferably 75% or less of all connecting yarns.

Further, the angle formed by the front/lining fabric and the connecting yarn is more preferably 40 to 85 degrees. In addition, it is more preferable that the ratio of connecting yarns in which the angle between the front and back fabric and the connecting yarns is 40 to 85 degrees (percentage of the number of connecting yarns) is 75% or less of all connecting yarns. preferable. As a result, the above effects, such as the double raschel knitted fabric being less likely to be crushed, become more excellent.

Moreover, regardless of the specific structure of the front and back fabric, the density of the double raschel knitted fabric is preferably 18-60 courses/25.4 mm and 16-50 wells/25.4 mm. When the density is at least these lower limits, the double raschel knitted fabric has good flexibility and workability. Further, when the density is below these upper limits, the elongation property is improved.

Moreover, the thickness of the double raschel knitted fabric is preferably 2 to 12 mm regardless of the specific structure of the front and back fabric. When the thickness is 2 mm or more, the seam fatigue and burst strength of the double raschel knitted fabric are improved. Further, when the thickness is 12 mm or less, the flexibility and workability of the double raschel knitted fabric are improved.

Further, the thickness of the double raschel knitted fabric is more preferably 2 to 8 mm. When the thickness is 8 mm or less, the double raschel knitted fabric has better flexibility and workability.

Moreover, it is preferable that the double raschel knitted fabric has a bursting strength of 1800 to 3800 Pa, regardless of the specific structure of the front and back fabric. Here, the bursting strength is the bursting strength measured by the method of Examples described later. A bursting strength of 1800 Pa or more provides sufficient durability for applications such as vehicle interior materials, interior materials, and shoes. Further, when the bursting strength is 3800 Pa or less, the texture is less likely to become rough and hard, and wrinkles are less likely to occur.

More preferably, the double raschel knitted fabric has a bursting strength of 1,900 to 3,200 Pa. As a result, the durability, feel and the like are improved.

Moreover, regardless of the specific structure of the front and back fabric structure, it is preferable that the seam fatigue of the double raschel knitted fabric is 2.5 mm or less. Here, the seam fatigue is the seam fatigue measured by the method of the embodiment described later. When the seam fatigue is 2.5 mm or less, the base threads are less likely to break from the seams and the double raschel knitted fabric is less likely to break, resulting in good durability of the double raschel knitted fabric.

The double raschel knitted fabric described above is knitted by a double raschel knitting machine, which is a type of warp knitting machine. As shown in FIG. 7, the double raschel knitting machine has two rows of knitting needles N1 and N2 and reeds L1 to L6 (expressed as L-1 to L-6 in the figure) each having a plurality of guides G1 to G6. ) and beams B1-B6 that supply yarns to the reeds L1-L6, respectively. Symbols M1 and M2 in FIG. 7 are needle hooks.

The double raschel knitting machine is preferably 14-28 gauge. If the double raschel knitting machine is 14 gauge or more, the feel of the knitted double raschel knitted fabric is less likely to become rough and hard, and the basis weight of the double raschel knitted fabric is less likely to be heavy , and workability is less likely to be impaired. If the double raschel knitting machine is 28 gauge or less, the texture of the knitted double raschel knitted fabric is less likely to be rough and hard, and the double raschel knitted fabric has good elongation and is less prone to wrinkles and distortion during use.

Such a double raschel knitting machine knits the double raschel knitted fabric of the present invention. When the double raschel knitting machine operates, the knitting yarns A1 to A6 supplied from the beams B1 to B6 are transferred from the outer fabric structure 1, the lining structure 2, and the connecting portion 3 by the operation of the reeds L1 to L6 and the knitting needle rows N1 and N2. The double raschel knitted fabric 10 is knitted.

A double raschel knitted fabric knitted by a double raschel knitting machine can be subjected to conventionally known post-processing such as dyeing and heat setting.

The manufactured double raschel knitted fabric of the present invention is used, for example, as interior materials, vehicle interior materials, and shoes. Vehicle interior materials include, for example, seat surfaces of seats, backrests, and headrests. The double raschel knitted fabric of the present invention is not only excellent in feel and cushioning properties, but also has good air permeability and good comfort during sweating because the outer fabric has openings. As described above, the double raschel knitted fabric of the present invention is also excellent in strength. Therefore, the double raschel knitted fabric of the present invention is suitable for at least the above uses.

Examples and comparative examples will now be described.

[Example 1]
A double raschel knitted fabric was knitted using a 22 gauge double raschel knitting machine (RD6DPLM-77E-22G, manufactured by Karl Mayer). As shown in FIG. 8, a full set of polyester multifilament yarns of 167 dtex/48 f is arranged on reed L-1 to form a three-needle swing cord knitting structure (1-0/3-4). A full set of polyester multifilament yarns of 167 dtex/48 f was arranged in No. 2 to form a denim knitted structure (0-1/2-1) to form a lining structure. Further, a full set of 33 dtex/1 f polyester monofilament yarns were arranged on reed L-3 to connect the front and back fabric structures. Furthermore, 167 dtex/48 f polyester textured yarn was arranged 3 in 3 out on reed L-4, and 167 dtex/48 f polyester textured yarn was arranged 3 in 3 out on reed L-5 to knit the surface texture.

The knitted double raschel knitted fabric is pre-set at 190 ° C. for 1 minute with a heat setter, dyed with a disperse dye at 130 ° C., dried, and finished set at 150 ° C. for 1 minute with a heat setter, A finished double raschel knitted fabric with 34 courses/25.4 mm, 23 wells/25.4 mm and a thickness of 3.0 mm was obtained. Table 1 shows the properties of the obtained double raschel knitted fabric and the structure of the knitted fabric.

[Examples 2 to 10 and Comparative Examples 1 to 6]
The double raschel knitted fabrics of Examples 2-10 and Comparative Examples 1-6 are summarized in FIGS. 9-23 and Tables 1-2. The method of manufacturing the double raschel knitted fabrics of Examples 2 to 10 and Comparative Examples 1 to 6 is the same as that of Example 1 unless otherwise specified.

Next, evaluation items and evaluation methods for the double raschel knitted fabrics of Examples and Comparative Examples will be described.

[Seam fatigue]
A piece of knitted fabric having a width of 100 mm and a length of 100 mm was taken as a set of two each in the warp and weft directions. Then, the front sides of the two pieces of knitted fabric were put together and sewn together at a position 7 mm from the end of one side to obtain a test piece. The sewing conditions were as follows: knitting needle: DP×17 21BPD (manufactured by Organ Needle Co., Ltd.), sewing thread: polyester #8, stitch pattern: lockstitch, stitch pitch: 5.0±0.5 mm. Furthermore, two cuts were made on each of the two sides parallel to the machine seam of the test piece. A cut was made at a position 25 mm inside from both ends of the side parallel to the sewing seam. The cut length was 88 mm. Two sets of such test pieces were made in each of the warp and weft directions.
Using an Amsler seam fatigue tester (ATD-200L, manufactured by Daiei Kagaku Seiki Co., Ltd.), the test piece is grasped at an interval of 120 mm in the center part of the three divisions by the above two cuts, and both sides A load of 30 N was applied to each. A test of 2500 reciprocations was performed under conditions of a stroke of 150 mm and a speed of 30 reciprocations/minute. After the reciprocating test, the maximum dimension of the hole caused by the displacement of the seams of the test piece was measured under load.
The seam fatigue was expressed in the warp and weft directions by whichever of the two sets of test pieces was larger. If the result is 2.5 mm or less, it can be said that the seam fatigue is excellent.

[Burst strength]
A fabric tensile tester (TGE-10 kN, manufactured by MinebeaMitsumi Co., Ltd.) equipped with a push rod type bursting jig with a diameter of 25 mm was used. A push rod was pushed into a circular test piece with a diameter of 44 mm taken from a double raschel knitted fabric at a speed of 100 mm/min, and the maximum point (N) of the test force at that time was converted to Pa and taken as the bursting strength.

[Tensile strength/elongation]
Three test pieces each having a width of 50 mm and a length of 250 mm were taken from each of the warp and weft directions, and the test pieces were marked so that the distance between the marks was 100 mm. Next, the test piece was attached to the grips of an Instron type testing machine at a grip interval of 150 mm, and an initial load of 1.0 N was applied to remove wrinkles and slack. It was pulled at a speed of 200 mm/min, and the maximum load and the distance between gauge lines at break were measured.
The tensile strength was defined as the average value of the maximum load of three test pieces in each of the warp and weft directions. If the result is 392 N/50 mm or more, it can be said that the tensile strength is excellent.
The elongation rate was calculated by the following formula and represented by the average value of three test pieces.
Elongation = (L1 - L0) / L0 x 100
L0: distance between gauge lines when initial load is applied (mm)
L1: Distance between gauge lines at break (mm)

[Tear strength]
Three test pieces each having a width of 50 mm and a length of 250 mm were taken from each of the warp and weft directions. Next, in the center of the test piece in the length direction, a cut of 10 mm is made at right angles to the side of the test piece, and the short side is 100 mm and the long side is 150 mm so that the cut is at the center of the short side of the isosceles trapezoid. marked with an isosceles trapezoid. Next, the portions on both hypotenuse sides of the isosceles trapezoid marked on the test piece were attached to grips of an Instron type testing machine at a grip interval of 100 mm. Here, the trapezoid was attached so that the short sides were stretched and the long sides were loose. Then, the test piece was torn at a speed of 200 mm/min until it broke, and the maximum load was measured. The average value of the maximum load was obtained for each of the three test pieces in the warp direction and the three test pieces in the weft direction, and the average values were taken as the tear strengths in the warp and weft directions. If the result is 78.4 N or more, it can be said that the tear strength is excellent.

Evaluation results of the double raschel knitted fabrics of Examples and Comparative Examples are shown in Tables 3 and 4. It was confirmed that the evaluation results of Examples were favorable.

A1 to A6... knitting yarn, B1 to B6... beam, G1 to G6... guide, H... opening, L1 to L6... reed, M1 to M2... needle hook, N1 to N2... knitting needle row 1... outer fabric structure, 2... Lining structure 3... Connecting part 4... Connecting yarn 10... Double raschel knitted fabric

Claims (10)

A double raschel knitted fabric consisting of a front and back fabric structure and a joint connecting them, wherein the front fabric structure has openings, and the total fineness of overlapping sinker loops calculated by the following calculation formula of the lining structure is 400. ~1800 dtex ,

moreover,
The lining fabric is a combination of a cord knitting fabric and a Denbi knitting fabric and/or a chain knitting fabric,
The needle loops of the cord knitting structure forming the lining structure and the needle loops of the Denbi and/or chain knitting structure forming the lining structure overlap in opposite directions to form needle loops. A double raschel knitted fabric characterized by 2. The double raschel knitted fabric according to claim 1, wherein the sum of the total overlapping fineness of the sinker loops of the outer fabric structure and the total fineness of overlapping the sinker loops of the lining structure is 650 to 2000 dtex. 2. The double raschel according to claim 1, wherein the lining structure is composed of a plurality of knitted structures, and the average number of overlapping sinker loops of the lining structure is 2 to 10/(well course). Knitted fabric. The outer fabric structure consists of a plurality of knitted structures, and the sum of the average number of overlapping sinker loops of the outer fabric and the average number of overlapping sinker loops of the lining fabric is 4 to 15 / (well / The double raschel knitted fabric according to claim 3, characterized in that it is a course. The double raschel knitted fabric according to any one of claims 1 to 4, wherein the cord knitting structure forming the lining structure has 2 to 8 stitches. The double raschel according to any one of claims 1 to 5, wherein the cord knitting structure and the denim knitting structure forming the lining structure are underlapped in the same direction to form a sinker loop. Knitted fabric. The double raschel knitted fabric according to any one of claims 1 to 6 , wherein the needle loops formed by the cord knitting structure forming the lining structure are closed stitches. The double raschel knitted fabric according to any one of claims 1 to 7 , characterized in that the needle loops formed by the denim knitted structure and/or the chain stitched structure forming the lining structure are open stitches. The double raschel knitted fabric according to any one of claims 1 to 8 , characterized in that the bursting strength is 1800-3800Pa. The double raschel knitted fabric according to any one of claims 1 to 9 , characterized in that seam fatigue is 2.5 mm or less.

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