JP2017008444A - Stretchable weft knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weft knitted fabric that has heavier basis weight and contains an elastomer, in which the weft knitted fabric exhibits an instantaneous temperature rise even under low elongation when stretched, persistently generates heat when stretched by stretching and contracting the weft knitted fabric repeatedly, and enables heat generation by stretching in an efficient manner.SOLUTION: There is provided a stretchable weft knitted fabric having a structure composed of an elastomer and a non-elastomer, in which the stretchable weft knitted fabric has a basis weight of 400 to 900 g/mand percent elongation in a warp direction under load of 9.8 N of 50 to 100%. The stretchable weft knitted fabric has a content of the elastomer of 30 to 70 g/m. When the stretchable weft knitted fabric is returned to the original length after stretching up to 50%, and stress of a forward path and stress of a backward path at a point of 40% in the middle of stretching and contracting are measured, a stress ratio of the fabric obtained from following expression (1): stress ratio of the fabric=(stress of a backward path (N) at a point of 40%)/(stress of a forward path (N) at a point of 40%) is 0.40 to 0.70. An instantaneous exothermic temperature is 1.0°C or more when the stretchable weft knitted fabric is stretched in the warp direction.SELECTED DRAWING: None

Description

  The present invention relates to a stretchable weft knitted fabric containing an elastic yarn whose temperature rises instantaneously when stretched.

Conventionally, clothes such as heat-insulating clothing that increase in temperature when worn are manufactured using a cloth mixed with moisture-absorbing heat-generating fibers such as cellulose, and heat is generated by insensitive excretion or sweating from the human body when worn. (For example, refer to Patent Document 1 below). However, the moisture-absorbing exothermic fiber does not generate any further heat when the fiber's moisture absorption reaches saturation, and not only the heat generation time is short, but also after the moisture absorption reaches saturation, the moisture in the fiber causes a cooling sensation. I even felt it. Furthermore, it is known to incorporate a heater such as a planar heating element or a linear heating element into a garment as a heating fabric or a heating garment other than hygroscopic heat generation. If you wear it, it will be heavy, and you will need an electrode, making it difficult to move.
Recently, there have been proposed knitted fabrics having a completely different heat generation function that generates heat when the knitted fabric is stretched during a wearing operation (see, for example, Patent Documents 2 and 3 below). In particular, Patent Document 3 proposes a knitted fabric that generates heat when stretched by a supporter having a relatively high weight.

JP 2003-227043 A JP 2011-195970 A JP 2013-072157 A

  Although these knitted fabrics are surely thin and generate heat when stretched, they are warm and suitable for shirts and tights. However, if the knitted fabric is not stretched by about 100% or more, the heat generation temperature is low. The supporter is also a supporter having an elongation of 100% or more, and when it is desired to firmly fix the joint portion or the like, the support effect is low and the support effect is low. As described above, a knitted fabric that has a high weight per unit such as a supporter, a glove, and a sock, and that generates heat when the knitted fabric is not stretched at the time of wearing is not yet obtained. Under such circumstances, the knitted fabric with a high-weight garment that can generate heat even when stretched low can provide support functions such as joints like a supporter, and even new items that are different from previous ones can be more comfortable. There is a need to provide a knitted fabric that can be manufactured.

  In view of the current state of the art, the problem to be solved by the present invention is that the temperature rises instantaneously at the time of extension even under low extension, and heat is generated at the time of extension continuously by repeating expansion and contraction. By providing a high-weight weft knitted fabric containing elastic yarn, which is a well-achieved and easy-to-move garment, and by using the weft knitted fabric as a garment such as gloves, socks, supporter, It is intended to provide a garment that can be expected to retain heat, prevent injuries caused by warming muscles and joints at the extension site, and improve blood flow.

As a result of intensive studies and repeated experiments to solve the above-mentioned problems, the present inventors have the following configuration in a weft knitted fabric composed of an inelastic yarn and an elastic yarn. The present inventors have found that the temperature can be set to 1.0 ° C. or higher and have completed the present invention.
That is, the present invention is as follows.

[1] A stretchable weft knitted fabric having a structure composed of elastic yarns and inelastic yarns having a basis weight of 400 to 900 g / m ² and a warp 9.8 N load elongation of 50 to 100%. The elastic yarn content is 30 to 70 g / m ² , the stretchable weft knitted fabric is stretched to 50% after being stretched, and the forward and backward stresses at 40% during stretching When measuring, the following formula (1):
Stress ratio of knitted fabric = return stress at 40% (N) / outward stress at 40% (N)
A stretch weft knitted fabric characterized in that the stress ratio of the knitted fabric obtained by the above is 0.40 to 0.70, and the instantaneous exothermic temperature at the time of stretching in the warp direction is 1.0 ° C or higher.
[2] At least two types of covered elastic yarns are used as the elastic yarn, and the thinnest covered elastic yarn extracted from the knitted fabric is returned to the original length after being stretched to 200%, and at the time of 100% during stretching. When measuring the forward stress and the return stress, the following formula (2):
Stress ratio of coated elastic yarn = Return stress at 100% (N) / Outward stress at 100% (N)
The elastic ratio described in [1], wherein the coated elastic yarn has a stress ratio of 0.40 to 0.70 and the thickest coated elastic yarn is knitted with an inlay structure. Knitted fabric.
[3] The above [1] or [2], wherein the number of loops determined by the product of the warp density (course / inch) and the weft density (wale / inch) of the stretchable weft knitted fabric is 400 to 800. Elastic weft knitted fabric described in 1.
[4] A garment in which the stretchable weft knitted fabric according to any one of [1] to [3] is used for a portion where the garment extends.

  The garment in which the stretchable weft knitted fabric of the present invention is arranged has a high basis weight and low elongation, and the weft knitted fabric is heated by over 1.0 ° C. due to bending and stretching of the knees and arms. In addition to being excellent in heat retaining properties, it has an effect of preventing injury and a fat burning effect by warming the muscles at the extension site. In particular, when worn during winter exercise, it is possible to prevent a decrease in muscle temperature due to heat generation, and to prevent a decrease in motor function due to a decrease in muscle temperature.

Hereinafter, embodiments of the present invention will be described in detail.
In this embodiment, in a high-weight clothing, in order to make it easy to wear and move, the yarn knitting length is increased to increase the loop, and the knitted fabric is increased by using a coarse gauge knitting machine. This makes it easy to wear and move. However, in order to generate heat when stretched, it is necessary for the elastic yarn to stretch efficiently, and in a knitted fabric that stretches well, the deformation of the loop is large and the elastic yarn is not stretched. It is important to balance the two because the heat generation efficiency is contradictory.

Furthermore, in the supporter aiming to support the body, there is also a problem that the support effect cannot be obtained in a knitted fabric that stretches better than 100%.
Therefore, the present inventors have examined the structure that generates heat when stretched even under low elongation in a stretchable weft knitted fabric having an elongation of 50 to 100% under a load of 9.8 N in the knitted fabric warp direction. Invented.

Specifically, in order to obtain a knitted fabric that generates heat when stretched under low elongation rather than the conventionally known heat generated when stretched under high elongation, the stretchable weft knitted fabric of the present embodiment has, for example, a hook diameter. About 30-40 inch round knitting machine with large diameter, small diameter round knitting machine with hook diameter 13-17 inch, cylindrical knitting machine with hook diameter 4 inch, and flat knitting machine Can be manufactured by a relatively coarse gauge circular knitting machine of about 16 to 24 gauge and a flat knitting machine, and has a basis weight of 400 to 900 g / m ² and an elongation under a 9.8 N load in the warp direction. A stretchable weft knitted fabric having a structure composed of elastic yarns and inelastic yarns of 50 to 100%, wherein the elastic yarn content is 30 to 70 g / m ² , and the stress ratio of the knitted fabric is 0. .40 to 0.70, and the instantaneous exothermic temperature during elongation in the warp direction is 1.0 ° C. or higher.

  Instantaneous heat generation temperature means that there is no external energy supply other than expansion and contraction, and the heat generation temperature does not change due to wind. The maximum temperature indicated by the knitted fabric during stretching for 5 minutes at a rate of 100 times per minute is measured by thermography, and the knitted fabric temperature before the start of the test. It is a value calculated from the difference. In addition, after the 10% stretch set of the knitted fabric, the stretch condition for performing the 30% repeat stretch for 5 minutes is hereinafter abbreviated as 30% repeat stretch.

  If the knitted fabric temperature during repeated stretching and stretching for 5 minutes is higher than the knitted fabric temperature before the start of the test, it indicates that heat is generated instantaneously. In the stretchable weft knitted fabric of the present embodiment, the instantaneous heat generation temperature measured by this method needs to be 1.0 ° C. or higher. At an instantaneous heat generation temperature of less than 1.0 ° C., almost no heat generation is felt. The instantaneous heat generation temperature is preferably 1.3 ° C. or higher, more preferably 2.0 ° C. or higher. The upper limit is not particularly limited as long as the instantaneous heat generation temperature is high, and the upper limit is not particularly limited as long as it does not adversely affect the human body, but if the elastic fiber content becomes too high to increase the instantaneous heat generation temperature, the knitted fabric will have high power. Therefore, it is practically preferable that the instantaneous heat generation temperature is 5 ° C. or less.

  Conventional knitted fabrics that contain elastic yarns give the knitted fabric stretchability and give it a comfortable fit when wearing clothes, which makes it possible to obtain slim aesthetic garments and improve motor functions. It was something to do. On the other hand, the present invention obtains a knitted fabric that generates heat by expansion and contraction, and is a knitted fabric of a completely different concept from the conventional product. In order to set the instantaneous heat generation temperature at 30% repetitive elongation to 1.0 ° C. or higher, the elastic yarn content, the knitted fabric elongation, the stress ratio of the knitted fabric, the number of loops, etc. are in an appropriate range, It is important to design a knitted fabric such as using a yarn, a loop structure, and the like, and a knitted fabric manufacturing method including a processing method for efficiently exhibiting heat generation by extension. According to the present invention, a stretchable knitted fabric having an instantaneous heat generation temperature of 1.0 ° C. or higher when repeatedly stretched by 30% is obtained for the first time. When worn as a garment, the stretch amount of the garment is only 20 to 30% even when the garment is worn. However, it generates a lot of heat, so that it can be felt when worn.

In the stretchable weft knitted fabric of the present embodiment, the elastic yarn content greatly contributes to the elongation heat generation in order to set the instantaneous heat generation temperature at 30% repeated stretching to 1.0 ° C. or more. Therefore, it is necessary to contain 30 to 70 g / m ² of elastic yarn in the knitted fabric. The more the elastic yarn is contained, the higher the heat generation temperature, so the content of the elastic yarn in the knitted fabric is preferably 35 to 65 g / m ² . If the elastic yarn content is low, the exothermic temperature is low, and if the elastic yarn content is too high, the weight of the knitted fabric increases and the knitted fabric becomes high power, making it difficult to move as a garment. The content is preferably 30 to 70 g / m ² .

  More importantly, for example, the elastic yarn generates heat when it is stretched, absorbs heat when it is stretched, and the complete elastic body, that is, the elongation-stress curve (SS curve) when stretched is completely overlapped. Such an elastic body has substantially the same heat generation during extension and endothermic temperature during relaxation of extension, that is, the amount of heat generation is substantially zero in the entire cycle during extension and relaxation of extension. The present invention defines a knitted fabric stress ratio for minimizing endothermic heat during stretching with respect to the heat generation temperature during stretching of the knitted fabric, and further achieves the range of the defined knitted fabric stress ratio. It was completed by finding the technical means for this.

There are optimum conditions for the stress ratio of the knitted fabric. That is, the knitted fabric is stretched to 50% in the warp direction, returned to the original length after stretching, and the following formula (1):
Stress ratio of knitted fabric = return stress at 40% (N) / outward stress at 40% (N)
It is important that the stress ratio of the knitted fabric obtained by rounding off the third digit after the decimal point is 0.40 to 0.70 with respect to the ratio of the forward stress and the backward stress at 40% during expansion and contraction obtained by It is.

In general, the stress ratio of a weft knitted fabric having a basis weight of 400 to 900 g / m ² is more than 0.70 even in a knitted fabric having a low elongation, but if the stress ratio of the knitted fabric is larger than 0.70, heat is generated during elongation. However, an endothermic phenomenon occurs during relaxation of the elongation, and as a result, the heat generation tends to be small. Further, when the knitted fabric has a stress ratio of less than 0.40, when the garment is used, the knitted fabric is deformed after bending and stretching the joints of the elbows and knees, and the garment loses its shape. Therefore, the stress ratio of the knitted fabric is preferably 0.40 to 0.70, and more preferably 0.45 to 0.65.
The reason why the stress ratio of the knitted fabric is obtained from the elongation and the stress at the time of recovery of 40% is that at this time, the heat generation temperature at the time of knitting fabric expansion and the endothermic temperature at the time of elongation recovery can be easily grasped. In addition, the smaller the stress ratio within the specified range, the lower the endothermic temperature and the higher the exothermic temperature.

  In the stretchable weft knitted fabric of the present embodiment, the elastic yarn content, the stress ratio of the elastic yarn itself, the stress ratio of the coated elastic yarn in which the elastic yarn is covered with the non-elastic yarn, the setting condition of the knitted fabric, the density of the knitted fabric The stress ratio of the knitted fabric can be controlled by the yarn friction between the loops in the knitted fabric. In particular, the stress ratio of the knitted fabric can be easily controlled by controlling the stress ratio of the coated elastic yarn.

  The elastic yarn used for the stretchable weft knitted fabric is preferably a coated elastic yarn coated with an inelastic yarn, thereby improving the knitting property and easily controlling the stress ratio of the knitted fabric. Become. That is, it becomes easy to set the stress ratio of the knitted fabric within a specific range by defining the stress ratio of the coated elastic yarn. To reduce the stress ratio of the coated elastic yarn, the draft ratio of the elastic yarn is reduced. Increasing the number of twists between elastic yarns and elastic yarns, using thick non-elastic yarns, and heat-setting coated elastic yarns or manufactured knitted fabrics to increase the set temperature, set time Strengthen the heat setting conditions such as lengthening. To increase the stress ratio of the coated elastic yarn, reduce the number of twists between the inelastic yarn and the elastic yarn, use a thin inelastic yarn, weaken the setting conditions when heat setting the manufactured knitted fabric, etc. Is possible. As a result, it is possible to control the stress ratio of the coated elastic yarn. By using the coated elastic yarn having a stress ratio in a specific range, the stress ratio of the knitted fabric can be set in a specific range. It becomes possible to produce a knitted fabric that generates high heat when stretched in the stretch region.

  Among these methods, the adjustment of the draft rate of the elastic yarn is particularly effective. The draft rate of the general coated elastic yarn is about 3.2 to 3.7, whereas the stretchable weft of the present embodiment. In the knitted fabric, when the draft rate is about 2.5 to 3.1, the stress ratio of the coated elastic yarn shown below can be easily set within a specified range. As for the draft ratio at the time of producing the coated elastic yarn, if the draft ratio is higher than 3.1, the stress ratio of the knitted fabric tends to increase. Conversely, if the draft ratio is less than 2.5, the stress ratio of the knitted fabric tends to increase. Becomes too low, and the production trouble of the coated elastic yarn is likely to occur.

In the stretchable weft knitted fabric of the present embodiment, the thin covered elastic yarn means a covered elastic yarn using a thin elastic yarn, and the thick covered elastic yarn means an elastic yarn used as a thin covered elastic yarn. In a preferred embodiment, at least two types of coated elastic yarns are used. In the stress control of the knitted fabric, the stress performance of the thin coated elastic yarn is important. As the thinnest covered elastic yarn extracted from the ground, it is returned to its original length after stretching to 200%, and the outward stress and the backward stress at 100% during expansion and contraction are measured, and the following formula (2):
Stress ratio of coated elastic yarn = Return stress at 100% (N) / Outward stress at 100% (N)
By using the coated elastic yarn having a stress ratio of the coated elastic yarn obtained by rounding off the third digit after the decimal point to 0.40 to 0.70, preferably 0.45 to 0.65, The stress ratio of the knitted fabric can be set within a specific range.

  The thickest coated elastic yarn is preferably knitted with an inlay structure in which tack and welt are repeated. The method of repeating the tack and welt is not particularly limited, and the tack and the welt may be alternated. Arbitrary combinations are possible, such as a loop followed by a welt 2 loop. Note that the covered elastic yarn of the inlay structure greatly affects the tightening force on the body when it is made into a knitted fabric, but it also affects the heat generation during elongation, and in particular, the coated elastic yarn that uses a thick elastic yarn as the tack increases. The inlay structure is preferably a structure in which the tuck and the welt repeat every loop since it becomes easy to stretch.

  In the preferred embodiment, at least two types of coated elastic yarns composed of a thin coated elastic yarn and a thick coated elastic yarn are used. Of course, the elastic yarns having different finenesses are used with the same fineness. A thin covered elastic yarn using a thin elastic yarn uses one elastic yarn, and a thick covered elastic yarn using a thick elastic yarn is a non-elastic yarn obtained by aligning a plurality of elastic yarns. In this case, the coated elastic yarn using a plurality of elastic yarns is the thickest coated elastic yarn. For example, a coated elastic yarn using one elastic yarn of 44 dt (decitex: the same symbol is used hereinafter) is a thin coated elastic yarn, and a coated elastic yarn using two 44 dt elastic yarns is a thick coated elastic yarn.

  The elastic yarn used for the stretchable weft knitted fabric of the present embodiment can be a polyurethane-based or polyetherester-based elastic yarn. For example, as the polyurethane-based elastic yarn, a dry-spun or melt-spun yarn is used. The polymer and spinning method are not particularly limited. The breaking elongation of the elastic yarn is about 400% to 1000%, is excellent in stretchability, and it is preferable that the stretchability is not impaired near the normal processing temperature of 180 ° C. in the presetting process during dyeing. As the elastic yarn, an elastic yarn imparted with functions such as high setting property, antibacterial property, moisture absorption and water absorption by addition of a special polymer or powder can be used. Here, with respect to the fineness of the elastic yarn used for the thin coated elastic yarn, it is possible to use a fiber of about 20 to 110 dtex, easy to manufacture the knitted fabric, and high heat generation temperature at the time of stretching, an elastic fiber of about 30 to 80 dtex. Is preferred. The fineness of the elastic yarn used for the thick coated elastic yarn is not particularly limited, but fibers of about 40 to 300 dtex can be used.

  Furthermore, the elastic yarn can contain an inorganic substance, and a knitted fabric that takes into account the performance of the contained inorganic substance can be obtained. For example, when titanium oxide is contained, the heat of the knitted fabric is stored in the titanium oxide. In addition, heat retention due to the far-infrared effect can be imparted. As the method of containing an inorganic substance, the simplest method is to add an inorganic substance to a spinning dope for elastic yarn and perform spinning. The inorganic substance refers to ceramics such as titanium oxide, inorganic simple substances such as carbon and carbon black, and / or inorganic compounds, and is preferably in a fine powder form so as not to hinder spinning of the elastic yarn. These inorganic substances are preferably contained in the elastic yarn in an amount of 1 to 10% by weight. By containing the inorganic substance, it becomes possible to more effectively exhibit the heat retention effect during heat generation of the knitted fabric. If the inorganic substance is small, the heat retention effect is small, and if it is too large, the yarn may break during spinning or stretching, so the content is preferably 1 to 10% by weight, more preferably 2 to 5% by weight. .

  In addition, the stress ratio of the knitted fabric is easily controlled by controlling the stress ratio of the thin coated elastic yarn. The stress ratio of the thin coated elastic yarn is determined by the draft rate of the elastic yarn, the number of twists and fineness of the inelastic yarn, and heat setting. For example, when the elastic yarn is stretched to 200% and then returned to its original length, the stress ratio of the forward stress and the return stress at the time of 100% However, it is preferable to produce a thin coated elastic yarn using an elastic yarn of 0.40 to 0.70 limited by the thin coated elastic yarn.

  As a method for producing an elastic yarn used for such a thin covered elastic yarn, there is a method for increasing the molecular weight of the elastic yarn. As another method, for example, a first class disclosed in JP-A-2001-140127 is known. Obtained by reacting an organic diisocyanate with a nitrogen-containing compound containing at least one selected from monofunctional amines of either amines or secondary amines, hydroxyl groups, and tertiary nitrogen or heterocyclic nitrogen, Urethane urea compound having an average number of urea bond units per molecule of 4 to 40; bifunctionality selected from at least one of primary amines and secondary amines shown in Japanese Patent No. 4343446 A nitrogen-containing compound containing a nitrogen-containing group selected from at least one of an amino group, a tertiary nitrogen and a heterocyclic nitrogen, and an organic diisocyanate, mono- or di- A urea compound obtained by reacting with at least one compound selected from the group consisting of alkyl monoamines, alkyl monoalcohols, and organic monoisocyanates; polyacrylonitrile polymers shown in JP-A-7-316922; Examples thereof include a method of spinning by adding a polyurethane having a terminal hydroxyl group structure obtained by a reaction of a mixture of a low molecular diol and a polymer diol with an organic diisocyanate; or a styrene-maleic anhydride copolymer. Examples of the polyurethane having a terminal hydroxyl group structure include a low molecular diol having a hydroxyl group at both ends of a linear or branched alkylene group having 2 to 10 carbon atoms or a divalent alicyclic hydrocarbon, and a number average molecular weight of 400 to 400. A number average molecular weight of 10,000 to 40,000, which is a reaction product of a mixture of 3000 high molecular diols (molar ratio 1 to 99) and an organic diisocyanate, having a terminal hydroxyl group and a urethane group concentration of 3 meq / g or more. The polyurethane polymer is preferred. These may be added to the elastic yarn alone or in combination of two or more, but if the addition amount is small, the elongation exothermic temperature effect is low, and conversely, if the addition amount is large, the knitted fabric stretch recovery is reduced, Since it becomes easy to lose shape due to wearing and washing, the addition amount is 2.0 to 15.0%, preferably 2.5 to 8.0%, based on the weight of the elastic yarn.

  The coated elastic yarn for covering the elastic yarn with the inelastic yarn includes a covering yarn in which the inelastic yarn is wound around the elastic yarn, a twisted yarn, and a mixed yarn in which the inelastic yarn and the elastic yarn are mixed by air injection or the like. It is possible to use a yarn or the like.

  In the elastic weft knitted fabric of the present embodiment, the warp direction density (course / inch) of the knitted fabric in addition to the elastic yarn content, the warp direction elongation, the knitted fabric stress ratio, and the thin coated elastic yarn stress ratio. The number of loops of the knitted fabric, which is the product of the knitted fabric's weft direction density (wale / inch), is also important. Can be optimized. That is, the number of loops is preferably in the range of 400 to 800, and even when the elastic yarn content, the stress ratio of the knitted fabric, the stress ratio of the coated elastic yarn, etc. are within the specified ranges, the exothermic temperature during stretching may be low. is there. In other words, when the number of loops is less than 400, one loop is a large loop. When the knitted fabric is stretched at a low elongation, the loop is only deformed and the elastic yarn is not stretched. The temperature goes down. When the number of loops is more than 800, the deformation of the loop is small, but the knitted fabric is too dense, the elongation becomes small and the movement is difficult, and the texture is hard. The number of loops can be controlled by the elastic yarn used, the fineness of the inelastic yarn, the gauge of the knitting machine, and the loop length control at the time of manufacturing the knitted fabric. It is easy to achieve by roughening the knitting machine gauge and increasing the degree of production of the knitted fabric. In particular, it is preferable to design the knitted fabric to have a wal of 20 to 30 wal / inch.

  The stretchable weft knitted fabric of this embodiment includes a circular knitting machine with a large diameter of about 30 to 40 inches, a small circular knitting machine with a diameter of 13 to 17 inches, a cylindrical knitting machine with a diameter of about 4 inches, Further, using a flat knitting machine, the gauge of the knitting machine can be manufactured by a relatively coarse gauge circular knitting machine of about 16 to 24 gauge and a flat knitting machine. Can be used arbitrarily, such as knitting with a knitting loop mainly composed of a knit loop, or a deer-like structure with a tucked structure, knitting with a wide knitting machine, cutting and sewing into a garment Using a knitting machine with a small hook diameter, a part of the knitted fabric knitted into a cylindrical shape can be sewn to make a garment. However, it is preferable to use a coated elastic yarn as the elastic yarn, and at least two or more types of coated elastic yarn may be used, and a knit loop may be formed only with a thin coated elastic yarn. It is preferable to manufacture the knitted fabric by aligning with

  Regarding the usage of the covered elastic yarn in the garment, at least the part that wants to generate heat when the knitted fabric is heated by the movement of the joint part, knitting the thin covered elastic yarn that contributes most to the heat generated during the extension, Although the contribution to the tightening force at the time of wearing is great, it is preferable that the thick covered elastic yarn that also affects the heat generation at the time of stretching is knitted by the inlay structure for every course or every 2 to 3 courses. For the parts other than the joint part, the coated elastic thread is not necessarily required, and it is possible to use a handle or a mesh tone, but in addition to the fit and support feeling of the clothes, Since some heat is generated when stretched, it is preferably composed of at least a thin covered elastic yarn. Even when a pattern or mesh is used, it is preferable that the covered elastic yarn also has a knitted structure.

Moreover, what is necessary is just to select a fineness so that a basis weight may be 400-900 g / m < ² > about inelastic yarns other than covering elastic yarn.

  The elastic weft knitted fabric of the present embodiment has a high power that is partially different in power, such as dotted, linear, curved, etc., by changing the knitting structure, yarn usage, or applying resin printing. And a low power part may be mixed. In this case, it is only necessary to satisfy this performance even in a part of the knitted fabric. For example, it is possible to place a high-strength exothermic knitted fabric only on the part that wants an exothermic heat effect, such as the knee, and a high-power constant stretch knitted fabric around the knee, etc. It becomes possible to make a product aimed at protecting the knee joint, etc., in the low extension part.

  Non-elastic yarns include polyester fibers such as polyethylene terephthalate and polytrimethylene terephthalate, polyamide fibers, polyolefin fibers such as polypropylene, cellulose fibers such as cupra, rayon, cotton and bamboo fibers, and animal hair such as wool. Any fiber such as fiber can be used. Also, these bright yarns, semi-dal yarns, full dull yarns, etc. can be used arbitrarily, and the fibers can have any cross-sectional shape such as round, elliptical, W-shaped, saddle-shaped, hollow fiber, etc. The shape of the fiber is not particularly limited, and a crimped yarn such as a raw yarn or false twist can be used, and the thickness of the inelastic yarn is not particularly limited, but the inelastic yarn used for the coated elastic yarn Is preferably inelastic yarn of 20 to 110 dt, preferably 30 to 90 dt. Further, it may be a long fiber or a spun yarn, and a composite yarn obtained by mixing two or more kinds of fibers by twisting, covering, air blending, or the like can be used. Furthermore, it is of course possible to mix two or more types of fibers on the knitting machine instead of mixing the fibers themselves.

  In the case of non-elastic yarns, particularly polyester fibers, polyamide fibers and cellulosic fibers, it is preferable to contain 0.3 to 5% by weight of an inorganic substance. By containing the inorganic substance, it is possible to more effectively exhibit the heat retaining effect when the elastic knitted fabric generates heat. If the inorganic substance is small, the heat retention effect is small, and if it is too large, yarn breakage may occur at the time of spinning or stretching. Therefore, the content is more preferably 0.5 to 5% by weight, and further preferably 0.4 to 3%. It is contained by weight%.

  In the elastic weft knitted fabric of this embodiment, if a material that absorbs moisture such as cellulose is used for the non-elastic yarn, it generates heat when worn and also generates heat when exercised. It is possible to increase. Furthermore, it is possible to make it difficult to release the heat generated by using spun yarn or raising, and it is possible to enhance the heat retaining effect.

  As a dyeing finishing method for the stretchable weft knitted fabric of the present embodiment, a normal dyeing finishing process can be used, and dyeing conditions according to the fiber material to be used are used, and the dyeing machine to be used is also a liquid dyeing machine, a wine dyeing machine, A paddle dyeing machine or the like is optional, and it is also possible to use a processing agent that improves water absorption and flexibility and a processing agent that improves heat retention. It is also possible to use dyed inelastic yarns. In this case, the dyeing process after knitting of the knitted fabric can be omitted, and the product can be made with the waste of the knitted fabric.

The elastic weft knitted fabric of the present embodiment can be clothes that are in close contact with the body, such as supporters, gloves, socks, etc., and may be used for the entire clothes, but it should be used for at least a part that greatly expands with clothes. Can do. For example, in the elbow supporter, the outer part of the elbow, the outer part of the knuckles in the glove, and the part from the instep to the ankle in the sock are greatly stretched during wearing movement. For example, it becomes warm clothes by daily movement and exercise. Further, if these portions that generate heat during extension are small, heat generation during extension cannot be realized. Therefore, it is preferable to have an area of about 1500 mm ² , such as at least 50 mm in the extension direction and 30 mm in the width direction.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited only to these Examples. In addition, evaluation in an Example was performed with the following method.
(1) Sampling If the knitted fabric includes a portion satisfying the constituent requirements of the present invention (hereinafter referred to as a stretchable weft knitted fabric portion) and a portion that does not, only the stretchable weft knitted fabric portion is present. In addition, if the sampling part does not meet the predetermined length or width according to the following measurement method, the maximum length and the maximum width of the elastic weft knitted fabric part are sampled. The sampled length was obtained as a reference.

(2) Instantaneous exothermic temperature The instantaneous exothermic temperature is measured using the following repetitive stretching tester, and the highest sample surface temperature during the specified time at which the knitted fabric is stretched and relaxed (returned) at a specified speed. Determined by measurement.
Repeating expansion and contraction machine: Dematcher testing machine (manufactured by Daiei Scientific Instruments)
Sample size: length 100 mm (excluding gripping part), width 50 mm
Measurement environment: constant temperature and humidity conditions of temperature 20 ° C. and 65% RH. The measurement was performed without receiving external energy supply other than expansion and contraction.
Sample set: The sample to be measured was stretched by 10%, and the dematcher tester was held at the top and bottom of the sample.
Elongation: 30%
Repeated stretching cycle: 108 times / minute Exothermic temperature measurement: Sample surface temperature during repeated stretching for 5 minutes was continuously measured by thermography. The emissivity of the thermography was set to 1.0.
Exothermic temperature evaluation: The temperature when the surface of the sample to be measured reached the maximum temperature was read, and the temperature that was higher than the temperature before expansion / contraction was defined as the instantaneous exothermic temperature.

(3) Elongation of knitted fabric Elongation of knitted fabric: length 100mm (excluding gripping part), width 25mm, using a Tensilon tensile tester (RTC-1210A manufactured by Orientec Co., Ltd.), stretched under the following conditions, 9 .Elongation under 8N load was measured.
Load: 0.1N
Tensile speed: 300 mm / min Tensile length: Elongation to 9.8 N load Measurement: Elongation was performed under the above conditions, and the longitudinal elongation at 9.8 N load was determined.

(4) Stress ratio of knitted fabric The stress ratio of the knitted fabric was measured by the following method.
Sample size: length 100 mm (excluding gripping part), width 25 mm
Tensile tester: Tensilon tensile tester (RTC-1210A manufactured by Orientec Co., Ltd.)
Initial load: 0.1N
Tensile speed and recovery speed: 300 mm / min Tensile length and measurement: Elongate to 50% extension, return to the original length after extension at the same speed (recover), and repeat extension and recovery three times under these conditions, The forward stress and the backward stress at 40% during the third expansion / contraction are obtained, and the following formula:
Stress ratio of knitted fabric = return stress at 40% (N) / outward stress at 40% (N)
Was calculated by rounding off the third decimal place.

(5) Stress ratio of coated elastic yarn The stress ratio of the coated elastic yarn was measured by the following method.
Sampling of sample: The knitted fabric was unwound and the coated elastic yarn was pulled out 100 mm (excluding the gripping portion).
Tensile tester: Tensilon tensile tester (RTC-1210A manufactured by Orientec Co., Ltd.)
Initial load: 0.05N
Tensile speed and recovery speed: 300 mm / min Tensile length and measurement: stretched to 200% elongation, returned to the original length after stretching at the same speed (recovered), repeated elongation and recovery three times under these conditions, The outward stress and the return stress at 100% during the third expansion / contraction are obtained, and the following formula:
Stress ratio of coated elastic yarn = Return stress at 100% (N) / Outward stress at 100% (N)
Was calculated by rounding off the third decimal place.

(6) Elastic Yarn Content The elastic yarn content (g / m ² ) in the knitted fabric was determined by rounding off one decimal place by the following method.
The inelastic yarn in the knitted fabric was removed by dissolution or the like, and the weight of only the elastic yarn was measured and converted to the weight per unit area. If it is difficult to remove the non-elastic yarn, the elastic yarn is removed from the knitted fabric after the weight measurement by dissolving, etc., and the weight of only the non-elastic yarn is measured. Weight.

[Example 1]
When manufacturing a supporter for elbows using a 24 gauge cylindrical knitting machine, the ester 84dtex / 36 filament processed yarn is prepared by dyeing it as it is, and then the elbow part is designed to be 100 mm in length. Then, an ester-processed yarn 84 dtex / 36 filament previously dyed on an elastic yarn 44 dtex (trade name Roika SF: manufactured by Asahi Kasei Fibers Co., Ltd.) as a thin coated elastic yarn is obtained by using an elastic yarn draft ratio of 2.8 and a twist number of 500 T / As a thick covered elastic yarn, an elastic yarn of 78 dtex (trade name Roika SF: manufactured by Asahi Kasei Fibers Co., Ltd.) and an ester-processed yarn 84 dtex / 36 filament previously dyed are used as a draft of the elastic yarn. It was manufactured by covering at a rate of 3.0 and a twist number of 500 T / m. The manufactured coated elastic yarn is used, and as the support texture, the previously dyed ester-processed yarn 84/36 and the fine coated elastic yarn are knitted together with a tense tissue, and the part corresponding to the elbow is in the ground structure. An inlay structure in which thick elastic yarns were alternately tucked and welted was knitted on all courses, and a knitted fabric having an elbow length of 100 mm was produced. The finished knitted fabric was finished so that the end of the knitted fabric could not be unraveled, and finished as a steamer set at 100 ° C. for 10 seconds to obtain a supporter product. Incidentally, the basis weight of the portion where the thick covered elastic yarn corresponding to the elbow is knitted by the inlay was 715 g / m ² .
The results of evaluating the performance of the obtained knitted fabric are shown in Table 1 below. The stretchable weft knitted fabric of the present invention of Example 1 had an instantaneous heat generation temperature of 1.0 ° C. or more when stretched, and was able to be a garment that warmly supports the elbow.

[Examples 2-6, Comparative Examples 1-2]
A knitted fabric (Example 2) in which the density is made coarser than in Example 1 and the elastic yarn content and the number of loops are lowered (Example 2), and the elastic yarn content and the number of loops are increased in density (Example 3). A knitted fabric in which the fineness of the thin coated elastic yarn was changed (Example 4: 33 dtex elastic yarn used, Example 5: 78 dtex elastic yarn used, Comparative Example 1: 22 dtex elastic yarn used), and the finished steam set at 120 ° C Knitted fabric made in 1 minute (Example 6), knitted fabric manufactured with a draft ratio of the elastic yarn at the time of production of the coated elastic yarn of 3.5 (Comparative Example 2), and knitted in the same manner as in Example 1 except these The ground was made and evaluated. The results are shown in Table 1 below.

[Example 7]
As the elastic yarn used for the thin coated elastic yarn, it is used in the polyurethane polymer (A agent) used in Example 4 of JP-A-7-316922 and in Example 1 of JP-A-2001-140127. A urethane urea compound (agent B) was prepared, and the agent A was added at 7 wt% and agent B was added at 3 wt% to the spinning bath when producing elastic yarn 44 dtex (trade name Roika CR: manufactured by Asahi Kasei Fibers Co., Ltd.). A knitted fabric was prepared and evaluated in the same manner as in Example 1 except that this elastic yarn was manufactured and used. The results are shown in Table 1 below.

[Example 8]
In producing socks using a 21 gauge sock knitting machine, prepare 84 dtex / 36 filament processed yarn as it is and prepare elastic yarn 44 dtex (trade name Roika BX: manufactured by Asahi Kasei Fibers Co., Ltd.) A thin covered elastic yarn was covered with a draft rate of 3.0 and a twist number of 500 T / m. Also, two elastic yarns 44 dtex (trade name Roika CF: manufactured by Asahi Kasei Fibers Co., Ltd.) are aligned and covered with an ester 84 dtex / 36 filament previously dyed with a draft rate of 2.9 and a twist number of 500 T / m. A thick coated elastic yarn was obtained. Using these coated elastic yarns, the cotton yarn 30S /-previously dyed as the ground texture and the fine coated elastic yarns are knitted and knitted in a kano and tuck structure that repeats knit and tack alternately. A thick elastic yarn is knitted with an inlay structure that repeats tuck and welt for a length of 100 mm, and a portion corresponding to the heel around the middle between 100 mm forms a ridge so that the thick covered elastic yarn is not knitted. And organized. The part corresponding to the toe of the finished knitted fabric was sewn, finished so that the end could not be unraveled, and finished as a sock by steam setting at 100 ° C. for 10 seconds. The weight of the portion where the thick covered elastic yarn corresponding to the instep was knitted by the inlay was 827 g / m ² .
The results of evaluating the performance of the obtained knitted fabric are shown in Table 1 below. The stretchable weft knitted fabric of the present invention of Example 8 had an instantaneous exothermic temperature of 1.0 ° C. or higher when stretched, and was able to be a warm sock even when walking.

  The stretchable weft knitted fabric of the present invention is a knitted fabric with a high basis weight, a knitted fabric whose temperature instantaneously rises even when stretched at a low stretch, and keeps heat by making clothes such as gloves, socks and supporters. Sex, prevention of injuries due to warming muscles and joints at the extension site, and clothing that can be expected to improve blood flow.

Claims (4)

A stretchable weft knitted fabric having a structure composed of elastic yarns and inelastic yarns having a basis weight of 400 to 900 g / m ² and an elongation of 50 to 100% under a load of 9.8 N in the warp direction, When the yarn content is 30 to 70 g / m ² , the stretched weft knitted fabric is stretched to 50% and then returned to its original length, and the forward stress and the backward stress at the time of 40% during stretching are measured The following formula (1):
Stress ratio of knitted fabric = return stress at 40% (N) / outward stress at 40% (N)
A stretch weft knitted fabric characterized in that the stress ratio of the knitted fabric obtained by the above is 0.40 to 0.70, and the instantaneous exothermic temperature at the time of stretching in the warp direction is 1.0 ° C or higher. At least two types of coated elastic yarn are used as the elastic yarn, and the thinnest coated elastic yarn extracted from the knitted fabric is returned to its original length after stretching to 200%, and the outward stress at the time of 100% during stretching When measuring the return stress, the following formula (2):
Stress ratio of coated elastic yarn = Return stress at 100% (N) / Outward stress at 100% (N)
The stretchable weft knitting according to claim 1, wherein the coated elastic yarn has a stress ratio of 0.40 to 0.70 and the thickest coated elastic yarn is knitted with an inlay structure. Earth.   The stretchable weft according to claim 1 or 2, wherein the number of loops determined by the product of warp density (course / inch) and weft density (wale / inch) of the stretchable weft knitted fabric is 400 to 800. Knitted fabric.   The garment which used the stretchable weft knitted fabric of any one of Claims 1-3 for the site | part which clothes extend.