JP2015055028A - Method for producing stretchable warp knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a stretchable warp knitted fabric to obtain a stretchable warp knitted fabric that is excellent in stretch-ability, has sufficient fundamental performance required as a stretchable warp knitted fabric, is highly practical, and does not show delicate variations in feelings (softness, hardness, hand feel, touch to the skin, tension due to elasticity or the like of the fabric).SOLUTION: The method for producing a stretchable warp knitted fabric is a method for producing a stretchable warp knitted fabric in which a non-elastic yarn and an elastic yarn are used and stitches are formed by the elastic yarns with one another and to which finish dyeing is applied. The relation expressed by the following formula is satisfied between the unit number of stitches (α) when stitches are formed and the unit number of stitches (β) after the finish dyeing: T-13.4≤β≤T+13.4 (T=-0.0373×α+5.4316×α).

Description

  The present invention relates to a stretch warp knitted fabric, and more specifically, a stretch warp knitted fabric that has good stretchability and recoverability, has no texture variation, and is suitably used for various innerwear and outerwear. About.

Conventionally, as a knitted fabric for innerwear such as pants, girdle, and body suit, a stretch warp knitted fabric, that is, a non-elastic yarn made of a synthetic fiber such as nylon and a polyurethane elastic yarn, for example, by a tricot machine or a Russell machine. A knitted warp knitted elastic fabric or a knitted fabric knitted with a circular knitting machine was used.
Such stretch warp knitted fabrics must be set to appropriate conditions such as the degree of elongation in each direction, the tension on the body, and other characteristics according to the application. However, in a stretch warp knitted fabric having only one elastic yarn, it has not been possible to provide the stretchability and sufficient tension in each direction required for such applications.

In view of this, various measures have been made to exhibit the elasticity and sufficient tightening force in each direction by forming a plurality of elastic yarns constituting the elastic warp knitted fabric and forming the stitches between the elastic yarns. ing. Examples thereof include the elastic warp knitted fabric of Patent Document 1 and the elastic warp knitted fabric of Patent Document 2 according to the invention of the present applicant.
In the elastic warp knitted fabric of Patent Document 1, synthetic warp knitted fabrics such as nylon are alternately knitted into the adjacent wales every two courses to form a warp knitted fabric structure. The first elastic yarn is repeatedly inserted in a zigzag pattern for each course in the same wales on the inner side (back side), and the second elastic yarn is the same on each side of the same number of courses. A stitch is formed by repeatedly inserting with a swing width of several wales. Further, the elastic warp knitted fabric of Patent Document 2 is composed of an inelastic yarn and two types of elastic yarns. The inelastic yarn forms a loop with all stitches, and the first elastic yarn has one course over the entire wale. Each stitch is inserted with a swing width of 1 to 2 stitches, and the second elastic yarn is inserted with a swing width of 1 to 3 stitches per course over the entire wale to form a stitch.

  These stretch warp knitted fabrics are obtained by combining two types of stretch yarns, that is, elastic yarns, and the synthetic fiber yarns, that is, non-elastic yarns, with the knitting structure as described above, and two types of stretch yarns. By forming a stitch with a natural yarn, that is, an elastic yarn, it exhibits good stretchability in both the vertical and horizontal directions, can exhibit sufficient characteristics in terms of power, and can provide a material suitable for innerwear and the like.

Utility Model Registration No. 1610782 Japanese Patent No. 2718441

However, even with stretchable warp knitted fabrics with stitches made of the above elastic yarns, it has recently been pointed out that there are subtle variations on the touch, whether it is the result of increased consumer demand levels. Yes. That is, the elastic warp knitted fabric having the stitches of the elastic yarn sufficiently exhibits the functionality (elongation, tension, etc.) essential for use, and has obtained sufficient satisfaction from consumers in that respect. However, it has been pointed out that there is a subtle variation between products in the texture (softness of fabric, hardness, texture and touch, waist tension, etc.).
Therefore, an object of the present invention is to eliminate the above-described subtle variations in the texture of a stretchable warp knitted fabric having stitches made of elastic yarns.

  The inventor has examined various causes of the above-described texture (softness, hardness, touch and touch, tension of the waist, etc.) in the finished fabric. As a result, no matter how high the stitching accuracy for stitch formation is in the knitting machine, the resulting fabric is not subjected to commercialization as it is, and is always subjected to the dyeing process. The finish density of the fabric does not match the design, which contributes to performance variations, resulting in subtle variations in the texture. However, this variation is the number of unit stitches and the dyed finish at the time of stitch formation. The present invention has been completed by finding that the problem can be solved by controlling so that a predetermined relationship is established with the number of unit stitches later.

That is, the stretchable warp knitted fabric according to the present invention is a stretchable warp knitted fabric in which inelastic yarns and elastic yarns are used and stitches are formed by elastic yarns and dyed and finished. The relationship represented by the following formula is established between the number of unit stitches (α) at the time and the number of unit stitches (β) after dyeing finish.
T-13.4 ≦ β ≦ T + 13.4
However, T = −0.0373 × α ² + 5.4316 × α
In the stretchable warp knitted fabric in which stitches are formed by elastic yarns, as described above, the above formula is used between the number of unit stitches at the time of stitch formation (α) and the number of unit stitches after dyeing finish (β). If the relationship expressed is established, the texture (softness of the fabric) will be improved in a highly practical warp knitted fabric that not only has excellent stretchability but also has sufficient basic performance required for a knitted fabric. In other words, it is possible to avoid subtle variations among products in terms of hardness, texture and touch, tension on the waist, and the like.

  Here, the number of unit stitches (α) at the time of stitch formation and the number of unit stitches (β) after dyeing finish are values obtained as shown in FIGS. 4 (a) and 4 (b). That is, the number of unit stitches at the time of stitch formation (α), as shown in FIG. 4 (a), at the time of stitch formation on a knitting machine using a needle, stitch comb, trick plate, etc. This means the number of stitches per inch (in) from the stitch formation start point to the point of first contact with the take-up roller. The number of unit stitches (β) after dyeing finish is ( As shown in b), it means the number of stitches per inch (in) in the fabric that has been dyed and finished.

  According to the elastic warp knitted fabric according to the present invention described above, as described above, an elastic yarn is also used in addition to an inelastic yarn, and a stitch is formed by elastic yarns. In a stretch warp knitted fabric, as described above, it exhibits good stretchability in both the vertical and horizontal directions, can exhibit sufficient characteristics in terms of power, and can provide a material suitable for innerwear and the like. In addition, there is no subtle variation between the fabrics in the texture of this excellent fabric (the softness and hardness of the fabric, the touch and touch, the tension of the waist, etc.).

It is a concrete knitting | organization organization chart of the elastic knitted fabric used as the Example of this invention. FIG. 3 is a schematic knitting structure diagram in a state of being disassembled into each yarn. It is explanatory drawing which shows the measuring method of the span angle of an elastic yarn. FIG. 4 is a calculation diagram (a) for determining the number of unit stitches (α) at the time of stitch formation and a calculation diagram (b) for determining the number of unit stitches (β) after dyeing finish.

Hereinafter, embodiments of the present invention will be described in detail. The scope of the present invention is not limited by these descriptions, and modifications other than the following examples can be made as appropriate without departing from the spirit of the present invention.
In the present invention, the basic knitting structure of the elastic warp knitted fabric itself, that is, the point that the non-elastic yarn and the elastic yarn are used and the stitches are formed by the elastic yarns may be the same as in the prior art. .
A warp knitting machine such as a normal Raschel machine can also be used as the warp knitting machine. However, as a warp knitting machine, a machine having a plurality of rivets is used, and among them, a full set of inelastic yarns are passed through one or more rows of the heels on the front side, and the first side on the rear side. It is preferable that the first elastic yarn and the second elastic yarn are each knitted with a full set. Either the first elastic yarn or the second elastic yarn may be arranged in front.

  The formation of stitches by elastic yarns is performed, for example, by knitting knitted non-elastic yarns such as nylon alternately on both adjacent or one-side wales every several courses as in the above-described stretchable knitted fabric. In the warp knitted fabric structure (back side), the first elastic yarn is repeatedly inserted in a zigzag pattern for each course in the same wale, and the second elastic yarn is inserted for the same number of courses. It may be performed by repeatedly inserting it with a swing width over the same number of wales adjacent to each other, and, similarly to the above-described elastic warp knitted fabric of Patent Document 2, it is composed of an inelastic yarn and two types of elastic yarn. The non-elastic yarn forms a loop in all stitches, the first elastic yarn is inserted with a swing width of 1 to 2 needles per course over the entire wales, and the second elastic yarn is 1 course over the entire wales. 1 to 3 needles Is inserted in the swing width may be as stitch-forming have been made.

  The stretch warp knitted fabric is not only stretched but also stretched in the body when high stretchability is required depending on the application, and when high stretchability is required in one direction of warp or width. When the tightness to moderately tighten is required, the texture of the knitted fabric surface may be important. It is necessary to change the combination of elastic yarn and inelastic yarn according to each application, but if you change the amount or thickness of elastic yarn or inelastic yarn to improve one performance, other performance Will fall. It is very difficult to obtain a stretch warp knitted fabric having necessary stretch characteristics and satisfying the basic performance as a knitted fabric according to the required performance in each application. For example, even if it has stretchability, it will not be practical if it repeatedly breaks and stretches, causing it to be difficult to use if the fabric is easily curled, and if the tear strength or burst strength is weak, It is inferior in durability and inferior in practicality. Moreover, even if these properties are excellent, if the quality of the appearance as a knitted fabric is poor, the product has no commercial value. Specifically, as the stretch warp knitted fabric of the knitted structure, when it is attempted to obtain a knitted fabric having a soft finish and a thin finished fabric, both inelastic and elastic yarns are thin. If you want to obtain a fabric that has a firm hand feeling and a strong correction force, you can use a thick thread. However, even if a warp knitted fabric is manufactured using the above-mentioned yarns, if the amount of inelastic yarn is small, the finished fabric will have less vertical elongation, and may be broken, pinholes, curls, etc. Defects are likely to occur. If the amount of inelastic yarn is knitted, the finished fabric will have good elongation, but the fabric will tend to be frayed or cracked. Even if the knitting amount is the same, if the thickness of the inelastic yarn changes, the characteristics of the fabric also change.

  When such a thing needs to be taken into consideration, as in the above-described elastic warp knitted fabric of Patent Document 2, consideration should be given to the use of yarn and the weight per unit stitch of the yarn. That is, the thickness of the inelastic yarn is 20 to 75 denier for the long fiber yarn and 35 to 54 denier for the short fiber yarn, the thickness of the first elastic yarn is 40 to 560 denier, The thickness is 20 to 105 denier, the thickness of the first elastic yarn is the same as or larger than that of the second elastic yarn, and the amount of the first elastic yarn supplied is 95 mm / R (warp stretch 75%). More than 130 mm / R (warp stretch 75%) and below, the second elastic yarn moving in the wale direction has an angle of 0 to 25 °, and the thickness of each yarn and the weight per unit stitch are (1) This is a consideration to satisfy the relationship of the expressions (3) to (3).

0.21A <= X <= 0.29A (1)
0.55B <= Y <= 0.69B (2)
4.5C + 0.04A-35 <= Z <= 5.5C + 0.05A-43 (3)
Here, A: Thickness of the first elastic yarn (denier)
B: The thickness of the second elastic thread (denier)
C: Inelastic thread thickness (denier)
X: Weight per unit stitch of the first elastic yarn (g / 3636 pieces / 10R)
Y: Weight per unit stitch of the second elastic yarn (g / 3636 / 10R)
Z: Weight per unit stitch of inelastic yarn (g / 3636 / 10R)
By defining the relationship between the thickness of the yarn that constitutes the knitted fabric and the weight per unit stitch, not only can the various properties be improved by the stretch knitting structure described above, but also the basic function as a knitted fabric. It is possible to provide an elastic warp knitted fabric with high product value and excellent performance. Specifically, since the elongation as a warp knitted fabric is large, it is easy to put on and take off when used in clothing, can follow the movement of the body when worn, and does not have a feeling of pressure or tightness. In addition, in both vertical and horizontal directions, especially in the horizontal direction, there is little difference between stretching force, ie, load power, and tension force, ie, unload power, and it shows characteristics close to a perfect elastic body. It grows along with it and recovers instantly, so it has a very good fit. Furthermore, if the thickness and combination of each yarn are changed within the range satisfying the conditional expression of the present invention, the power, the elongation rate, the elongation recovery rate, etc. have various characteristics suitable for each application and required function. An elastic warp knitted fabric having a value can be easily obtained, and can greatly contribute to the expansion of applications and the demand for this type of stretch warp knitted fabric.

  More specifically, in the present invention, as the inelastic yarn, either a long fiber such as nylon or polyester, or a short fiber such as cotton or acrylic, can be used. Any material can be used. The inelastic yarn has a relatively small elongation, and usually has an elongation of 60% or less. The thickness of the inelastic yarn varies depending on the number of inelastic yarns in a plurality of rows to be combined. Usually, the individual inelastic yarn is 20 to 75 denier in the case of long fibers, and the cotton count in the short fiber yarns. A thread of 35 to 54 denier including 100 to 150 (53.1 to 35.4 denier in terms of denier) is used. The number of rows of inelastic yarns is usually one, but may be two or more if necessary. When the number of inelastic yarns increases, it is preferable to reduce the thickness of each inelastic yarn. If the non-elastic yarn is thick, the finished density of the manufactured warp knitted fabric is less likely to be included compared to the density on the knitting machine at the time of knitting, and it is not preferable because elongation is difficult to occur. If the inelastic yarn is thin, the durability is inferior.

  As the first elastic yarn and the second elastic yarn, various fibers excellent in elasticity can be used. For example, a highly elastic polyurethane yarn, so-called spandex is preferable. In addition, a covering yarn obtained by twisting long fibers such as nylon on an elastic yarn, a covering yarn obtained by twisting a spun yarn such as cotton, or a core yarn, so-called coated elastic yarn or composite elastic yarn is also used in the present invention. Used as elastic yarn. The elongation of the elastic yarn is preferably 400% or more. The elastic yarn is 40 to 560 denier, preferably 105 to 560 denier for the first elastic yarn, and 20 to 105 denier, preferably 40 to 70 denier, for the second elastic yarn. Normally, a thicker thread than the second elastic thread is used for the first elastic thread, but a thread having the same thickness may be used for the first elastic thread and the second elastic thread. If the first elastic yarn is less than 40 denier, it is not preferable because the density is difficult to enter in the warp direction, the warp elongation is not achieved, the warp power is weak, and the intended function cannot be exhibited. If the second elastic yarn is less than 20 denier, the density is difficult to enter in the horizontal direction, the horizontal elongation is not obtained, and the kickback in the horizontal direction is weak, which is not preferable. If the first elastic yarn exceeds 560 denier, the fabric becomes thick and heavy, and the power becomes too strong, which is not preferable. If the second elastic yarn exceeds 105 denier, the fabric becomes stiff and rubbery, which is not suitable for clothes.

  By knitting the first and second elastic yarns with a constant swing width with respect to the basic knitted fabric structure made of inelastic yarn as described above, it is possible to impart good stretchability to the knitted fabric. it can. Of the two types of elastic yarns, the first elastic yarn is inserted with a swing width of 1 to 2 needles per course over the entire wale. Usually, it is repeatedly inserted in a zigzag manner with a swing width of one needle, that is, with a swing width of one needle per course in the same wale. However, there may be a case where the swing width is 2 stitches, or a course where the swing width is 1 needle and a course where the swing width is 2 needles are mixed. When the swing width is 3 stitches or more, the yarns overlap and become thick, the fabric becomes difficult to shrink in the vertical direction, and there is no elongation. In addition, it is not preferable because the power in the horizontal direction becomes too strong, causing problems such as the occurrence of curling of the fabric.

  Further, the second elastic yarn is inserted with a swing width of 1 to 3 needles per course over the entire wales. Usually, it is inserted so that a course having the same swing width as that of the first elastic thread and a course having a swing width of three stitches or less wider than the first elastic thread are mixed over the entire wale. In this case, the swing width of the second elastic yarn does not become narrower than the swing width of the first elastic yarn. With this configuration, when the knitted fabric is formed, the first elastic yarn having a relatively small swing width can exhibit excellent elasticity in the vertical direction, and the second elastic yarn having a relatively wide swing width can be used in the horizontal direction. Excellent elasticity can be demonstrated. More specifically, the second elastic yarn is based on a course having a swing width of one needle, and a course having a swing width of two to three needles is arranged every several courses. If the swing width of the second elastic yarn is 4 stitches or more, it will be difficult to shrink after knitting, so the warp knitted fabric will not stretch, it will feel stiff, it is inappropriate as a material for innerwear etc., and the cost will also be It is expensive and expensive.

When there is only one type of elastic yarn, in other words, when the thickness and knitting structure of the first elastic yarn and the second elastic yarn are all the same, only one direction of warp or horizontal is given stretchability. However, it is not preferable because it cannot provide appropriate stretchability in both directions. If the operating conditions of the warp knitting machine are set so that the knitted structure as described above is knitted using the elastic yarn and the non-elastic yarn as described above, the stretchable knitted fabric of the present invention can be obtained. can get. The specific knitting procedure may be an appropriate combination of conventional warp knitting techniques. However, in the present invention, the characteristics of the obtained warp knitted fabric satisfy the following conditions.
First, the angle of the second elastic yarn moving in the wale direction is set to 0 to 25 °. In the knitted structure, the second elastic yarn is knitted while moving in the wale direction from one course to the next course. At this time, an angle formed by a portion of the second elastic yarn extending in the wale direction between the courses with respect to the wale direction defined as the orthogonal direction of each course direction is referred to as the crossing angle. This span angle is defined in the angle range. The span angle can be measured by observing the structure of the knitted fabric. However, if the knitted fabric is treated with an acid or the like to remove the inelastic yarn and leave only the elastic yarn, the measurement can be easily performed.

The span angle is added at the time of knitting, the ratio of the supply amount of the second elastic yarn to the supply amount of other yarns, the tension applied to the knitted fabric at the time of knitting, and the dyeing and arranging process of the knitted fabric It can be adjusted by the ratio of density adjustment by pushing and pulling vertically. Next, the thicknesses A to C of each yarn and the weights X to Z per unit stitch of each yarn are defined so as to satisfy the expressions (1) to (3).
The weight per unit stitch can be obtained by disassembling a knitted fabric having a fixed number of stitches and measuring the weight of each constituent yarn. The weight measured here is a value including dropping of the oil agent at the time of production and adhesion of the finishing agent after dyeing and arranging. The weight per unit stitch of each constituent yarn of the knitted fabric varies depending on the thickness and length of the yarn included in the number of unit stitches of the knitted fabric. If the thickness of the yarn is the same, the weight per unit stitch in the knitted fabric can be changed by adjusting the yarn supply amount of each constituent yarn at the time of knitting. In the present invention, it is preferable that the weights X to Z per unit stitch satisfy the expressions (1) to (3) by adjusting the supply amounts of the inelastic yarn and the elastic yarn during knitting.

  The supply amount of each yarn constituting the warp knitted fabric is 820 to 1437 mm / R for inelastic yarn, 95 to 130 mm / R for first elastic yarn (75% warp stretch), and 280 to 350 mm for second elastic yarn. / R (warping stretch 100%) is preferable. Here, mm / R means the yarn feed amount mm per rack (480 course). Since the yarn feed amount mm / R varies depending on the warp stretch, if the warp stretch of the first and second elastic yarns is different from the above, the feed in the case of 75% or 100% is used. Convert the yarn amount and set the yarn feed amount in each case. The yarn feed amount can be adjusted with the yarn feed device of the warp knitting machine, but the yarn feed device calculates the correct yarn feed amount from the amount of each yarn per unit stitch of the warp knitted fabric finally obtained. It is preferable to feed back to the adjustment operation.

  If the supply amount of the first elastic yarn is too small, the finished fabric is likely to be broken, slipped or curled. When the amount of the first elastic yarn supplied is too large, the density in the warp direction does not enter and the fabric becomes less stretched in the warp direction. If the supply amount of the second elastic yarn is too small, the fabric width enters and the cost increases, and when the fabric is pulled strongly in the horizontal direction, the yarn breaks and the eyes break. If the amount of the second elastic yarn supplied is too large, the effect of inserting the elastic yarn will not be exhibited, the width in the horizontal direction will not enter, the elongation will be small, and the fabric will have poor kickback, There is also the disadvantage that the surface is not finished in a smooth satin tone. The yarn feed amount of each yarn needs to be adjusted so that the weights X to Z per unit stitch satisfying the expressions (1) to (3) described above are achieved within the above-described yarn feed amount range. There is.

Next, the dyeing finishing process in the elastic warp knitted fabric and the expansion and contraction of the fabric in the preceding and following processes will be described. These expansion / contractions are factors that affect the size of the number of unit stitches related to whether or not the relational expression of the unit stitch numbers defined in the present invention is satisfied.
Refinement / Relaxing Process: A process of removing impurities and dirt adhering to the fiber to obtain a clean state, and at the same time, expressing a contraction factor of the yarn and the knitted structure to make it stable. As a result, in this step, the dough is relaxed and the dough shrinks.
Intermediate setting step: A step of pulling the dough assuming the finishing density and physical properties and applying heat to temporarily fix it. As described above, in this step, the dough is stretched slightly because the dough is pulled.

Dyeing process: A process of dyeing the fabric into a specified color. In order to dye the dough in a hot bath, the dough shrinks slightly in this process.
Finishing setting process: A process of fixing the fabric after slightly pulling the dough so as to match the target density. In this process, the fabric is stretched a little because it is pulled slightly in consideration of the shrinkage in the dyeing process.
In the implementation of the present invention, if the expansion and contraction in each process described above is taken into consideration, and the intermediate set process is considered so as to realize a set according to the target, the blur between the fabrics is reduced and the finished product is stable. Can be obtained.

The elastic warp knitted fabric of the present invention can be used for various applications in which an elastic warp knitted fabric has been conventionally used. For example, innerwear such as girdle and body suit, sportswear such as swimwear and leotard, etc. It is suitable for.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these.
Below, the relationship between the number of unit stitches at the time of stitch formation (α) and the number of unit stitches after dyeing finish (β) is within the range defined in the present invention, and out of the range. Comparative Examples 1 and 2 were shown, and the degree of texture variation was viewed as the degree of density variation.
In all of these examples and comparative examples, the use of yarn, the knitting structure, and the device used are all the same, and are as follows, and are preferred in the present invention (1) to (3) The relationship of the formula is satisfied.
<War knitting machine>
KARL MAYER Raschel machine type RE4N, 130 inches wide, 56GG
<Thread use>
Front: Non-elastic yarn Nylon 66 44T-20Br variant (Toray Industries, Inc.)
Middle: 1st elastic yarn LYCRA 235T-127C (manufactured by East Leoperontex)
Back: 2nd elastic yarn Lycra 44T-127C (manufactured by Toyo Leoperontex)
<Pull-in arrangement to cocoon>
Front, middle, back full set <knitting organization>
Front: 42/24/20/24/42/46 //
Middle: 22/00 //
Back: 22/00/66/44/66/00 //
FIG. 1 shows a concrete knitting structure diagram, and FIG. 2 shows a schematic knitting structure diagram in a state where the knitting structure is disassembled into each yarn. In the figure, the warp knitted fabric is composed of an inelastic yarn 10, a first elastic yarn 20 and a second elastic yarn 30.
<Yarn feed amount>
The yarn feed amount was appropriately adjusted so as to satisfy the relational expression of the weight per unit stitch described above.

Knitting was performed under the above conditions to produce stretch warp knitted fabrics that are the fabrics of Examples 1 to 3 and Comparative Examples 1 and 2.

Next, the dyeing finish described below was applied to the obtained stretch warp knitted fabric.
In addition, the following dyeing finish is an example, and even if it implements other dyeing finishing conditions, the effect intended by the present invention does not change.
<Dyeing finish>
The elastic warp knitted fabric is refined and relaxed by passing it through an expanded continuous relaxer, then preset at 190 ° C, and then put into a liquid dyeing machine for dyeing at 95 ° C for 3 hours. Finishing set was performed at ℃.

About the stretch warp knitted fabric obtained as described above, the span angle and various physical properties of the second elastic yarn were measured as follows.
<The span angle of the second elastic yarn>
A sample cut to about 5 cm ² was sufficiently stirred in a flask containing a 20% strength hydrochloric acid solution. The nylon constituting the inelastic yarn in the sample was melted, and the first and second elastic yarns made of polyurethane remained in contact and fusion in a crossed form in the knitted state. Even when the combination of yarns constituting the knitted fabric is different, the same operation may be performed using a solvent that does not dissolve the elastic yarn but can dissolve only the inelastic yarn.

The appearance of the treated knitted fabric is schematically shown in FIG. It can be seen that the second elastic yarn 30 (neighboring yarns are distinguished by changing the pattern) moves in the wale direction between courses with respect to the first elastic yarn 20 extending in the course direction. In this state, a virtual horizontal line L was set in the wale direction, and the inclination angle of the second elastic yarn 30 with respect to the horizontal line L, that is, the span angle θ was measured.
<Physical properties>
For both directions of warp knitted fabric, loading and unloading were repeated, and a stretch evaluation test was performed. From the test results, power, elongation recovery rate, and elongation were calculated. The test conditions were a sample width of 2.5 cm, a distance between grips of 10 cm, and a tensile speed of 300 mm / min. The value of power indicates a value at an elongation rate of 15 to 80% in the third cycle. When the elongation ratio was 15 to 50%, the values of the loading process / unloading process were shown. The elongation recovery rate indicates the value of the first cycle / third cycle. The elongation is a value in the first cycle.
<Stretch fatigue resistance>
Test equipment: Stretching fatigue tester Sample adjustment:
(Non-sewing test) A test piece of 17 cm × 9 cm is taken in the direction in which the elastic thread enters.
(Sewing test) Two test pieces of 9.5 cm × 9 cm are made in the direction in which the elastic yarn is inserted, one piece is stitched in the knitting start direction, and one piece is stitched in the knitting end direction. The stitch is over 2 stitches, the stitch is 13 stitches / inch, the thread is wooly nylon 210d, the needle is # 11, and the allowance is 7 mm.
Test operation:
(Dry test = D) An unsewn sample is used. Measurement is performed at a tensile interval of 7 cm (both edge gripping margins 5 cm), a tensile speed of 200 rpm, and a number of times of 7500.
(Wet test = W) Sewing samples are used. Measurement is performed under the same conditions as in the drying test except that the test piece is sufficiently immersed in a 0.13% synthetic detergent solution.
(Non-sewn torsion test) After using a non-sewn sample and sufficiently immersing it in pure water, the sample is folded in three and twisted 360 ° and mounted on a testing machine. The test operation is performed in the same manner as the dry test and the wet test, but the number of times is 2500. In the non-sewing test 7500 times in the horizontal direction, the drying test is performed in a direction perpendicular to the direction of the first elastic yarn.
<Rupture strength, tear strength, curl> Measurement is performed as follows.
(Burst strength) Measured according to JIS L-1018 A method (Murren type method). However, since the elongation of the fabric is large, measurement is performed with the test fabric stretched 50% in all directions.
(Tearing strength) Measured according to JIS L-1018 single tongue method. The numerical value reading is expressed as an average value of three minimum values of maximum values from the tearing load curve.
(Curl) A test piece of 10 cm × 10 cm is left in an atmosphere of a temperature of 20 ± 2 ° C. and a humidity of 65 ± 2% RH for 4 hours, and the texture of the fabric is observed. A material whose edge in either the vertical or horizontal direction was curled by 360 ° or more was judged as defective.

Regarding the stretch warp knitted fabric used in Examples and Comparative Examples, various physical properties measured as described above are as shown in Table 1 below.

Whether the relationship between the number of unit stitches (α) at the time of stitch formation and the number of unit stitches (β) after dyeing finish is within the range defined in the present invention (in the case of Examples 1 to 3), or the range The presence or absence of the texture variation due to the outside (in the case of Comparative Examples 1 and 2) was determined by the size of the stitch finish density variation (difference from the target). The number of samples was 5 for all.
The number of unit stitches (α) at the time of stitch formation is “78.0 (c / in)”, the number of unit stitches after dyeing finish (β) is “195.0 (c / in)”, and is defined by the present invention. (Example 1), the number of unit stitches (α) at the time of stitch formation is “75.2 (c / in)”, and the number of unit stitches (β) after dyeing finish is “207.0”. (C / in) ”and satisfying the relationship defined in the present invention (Example 2), and the number of unit stitches (α) at the time of stitch formation is“ 90.2 (c / in) ”, The texture measurement results when the number of unit stitches (β) after dyeing finish is “174.0 (c / in)” and satisfies the relationship defined in the present invention (Example 3) are shown in Tables 2 to 2 below. As can be seen from FIG. 4, in each case, the variation in texture as seen from the variation in density (difference from the target) is extremely small, whereas the number of unit stitches (α) at the time of stitch formation is “67.3 (c / in) ”, when the number of unit stitches (β) after dyeing finish is“ 168.0 (c / in) ”and does not satisfy the relationship defined in the present invention (Comparative Example 1), and stitch formation The number of unit stitches (α) at the time is “85.6 (c / in)”, and the number of unit stitches after dyeing finish (β) is “210.0 (c / in)”. The texture measurement results when the relationship is not satisfied (Comparative Example 2) are as shown in Tables 5 and 6 below, and both have large texture variations as seen from the density variation (difference from the target). I understand that.

  The present invention can be suitably used for providing a knitted fabric for innerwear such as pants, girdle and body suit.

DESCRIPTION OF SYMBOLS 10 ... Inelastic thread 20 ... 1st elastic thread 30 ... 2nd elastic thread

That is, the manufacturing method of the stretchable warp knitted fabric according to the present invention produces elastic warp knitted fabric stitch formation by inelastic yarn and elastic yarn are used elastic yarn to each other has been made dyeing finishing with have been made The method is characterized in that a relationship represented by the following formula is established between the number of unit stitches (α) at the time of stitch formation and the number of unit stitches (β) after dyeing finish.
T-13.4 ≦ β ≦ T + 13.4
However, T = −0.0373 × α ² + 5.4316 × α
In the stretchable warp knitted fabric in which stitches are formed by elastic yarns, as described above, the above formula is used between the number of unit stitches at the time of stitch formation (α) and the number of unit stitches after dyeing finish (β). If the relationship expressed is established, the texture (softness of the fabric) will be improved in a highly practical warp knitted fabric that not only has excellent stretchability but also has sufficient basic performance required for a knitted fabric. In other words, it is possible to avoid subtle variations among products in terms of hardness, texture and touch, tension on the waist, and the like.

According to the method for producing a stretchable warp knitted fabric according to the present invention described above, as described above, an elastic yarn is also used in addition to an inelastic yarn, and a stitch is formed by elastic yarns. In the elastic warp knitted fabric thus made, as described above, the elastic warp knitted fabric exhibits good stretchability in both the vertical and horizontal directions, can exhibit sufficient characteristics in terms of power, and provides a material suitable for innerwear and the like. In addition to being able to do this, this excellent fabric texture (softness of fabric, hardness, feel and touch, tension of the waist etc.) does not cause subtle variation between fabrics. .

Claims (1)

An elastic warp knitted fabric in which inelastic yarns and elastic yarns are used and stitches are formed between elastic yarns and dyed and finished, and the number of unit stitches (α) at the time of stitch formation and after dyeing finish A stretch warp knitted fabric characterized in that a relationship represented by the following formula is established between the number of unit stitches (β).
T-13.4 ≦ β ≦ T + 13.4
However, T = −0.0373 × α ² + 5.4316 × α

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