JP2014015688A - Method of manufacturing circularly knitted fabric, circularly knitted fabric, and working wear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a circularly knitted fabric capable of stably manufacturing a fabric having a maximum elongation in a circumferential direction of 200% in the circularly knitted fabric.SOLUTION: In the method of manufacturing a circularly knitted fabric for forming a cylindrical circularly knitted texture having a large elongation in a circumferential direction by knitting an elastic inserting yarn 3 in a course direction while making stitches with an elastic knitting yarn 2, predetermined active feeding means 30 are respectively disposed on routes of the knitting yarn 2 and the inserting yarn 3 for feeding the knitting yarn 2 and the inserting yarn 3 while enlarging elongation of these to feed the knitting yarn 2 and the inserting yarn 3 to the circular knitting machine 40 with the active feeding means 30 while keeping amounts of feeding of the knitting yarn 2 and the inserting yarn 3 constant respectively.

Description

  The present invention relates to a method for producing a circular knitted fabric, a circular knitted fabric and work clothes.

  Circular knitted fabric is rich in stretch in the circumferential direction, and is widely used as a supporter, a reinforcing member, and the like for clothing. The size of the body, especially around the torso, neck, wrists and ankles, varies from person to person, but it is reasonable to deal with a certain amount of clothes with a predetermined size. In addition, there is a case where it is preferable that an appropriate pressure is applied when clothes are worn, and there is an increasing demand for a circular knitted fabric excellent in properties (elongation elasticity recovery property, stretch property) that stretches well and returns to its original state. .

  Patent document 1 relates to sportswear, and describes using polyurethane elastic yarn to form a knitted fabric with an elongation of 80% by Russell knitting.

  Patent Document 2 describes a stretchable knitted fabric that is made into a stretchable knitted fabric by Russell knitting using two types of elastic yarns and inelastic yarns in order to exert power.

  Patent Document 3 describes a soft stretch elastic knitted fabric that is knitted from polyurethane elastic yarn and non-elastic yarn and has stitches formed by elastic yarn.

Japanese Patent No. 3000444 Japanese Patent No. 2718441 Japanese Patent Laid-Open No. 2005-213661

  As described above, the size of the wrist and ankle varies depending on the person, but it is reasonable to correspond to some extent with clothes of a predetermined size. However, the stretch fabrics described in Patent Documents 1 to 3 are mainly intended to press the body, and depending on the person, the wrist and ankle may be tightened and may feel painful. As a method for solving this problem, it is necessary to form a circular knitted fabric that has a higher elongation rate than the prior art and requires less power to obtain a larger elongation rate. For example, if the horizontal axis of the graph is the expansion rate and the vertical axis of the graph is the power, the slope of the hysteresis curve consisting of the expansion curve and the contraction curve (recovery curve) is reduced, and the expansion rate (circumferential or longitudinal direction) It is considered that the maximum elongation) may be 200% at the maximum. Here, the circumferential stretch rate of the circular knitted fabric is 200%. Based on the circumferential length of the circular knitted fabric in a state where no power is applied, the circular knitted fabric is when the power is applied. This means that the length in the circumferential direction is 3.0 times in the circumferential direction.

  Recently, in the food industry, the electronic parts industry, and the like, there is an increasing demand for work clothes that prevent body hair from falling. More specifically, there is a demand for circular production of a circular knitted fabric having a single predetermined size, which can be stretched better than before and excellent in returning properties.

  Circular knitted fabrics are characterized by a greater elongation in the circumferential direction than weft knitted fabrics. However, it is considered difficult to industrially produce a circular knitted fabric with a maximum elongation of 200% in the circumferential direction. In other words, in the known knitting method, the downstream knitting machine is knitting while pulling the yarn (elastic yarn or inelastic yarn) from the upstream beam. Generally, when the yarn tension exceeds a set value, the upstream knitting machine When the yarn is supplied from the beam and the yarn tension falls below the set value, the supply of the yarn from the upstream beam is stopped. When an inelastic yarn is used, it is relatively easy to supply a constant amount because the yarn does not expand or contract. However, when an elastic yarn is used, the yarn is knitted while the expansion and contraction of the elastic yarn are repeated, and the variation in the expansion and contraction of the knitted elastic yarn becomes large. Due to the nature of rubber, the elastic yarn stretches and contracts slowly, so it is not possible to quickly supply and stop the yarn, and there is a time lag, which stabilizes the elastic yarn with a constant tension. I can't send it. In addition, due to the time lag, if the operation of the knitting machine is accelerated, the elastic yarn may be broken in some cases.

  Accordingly, an object of the present invention is to provide a circular knitted fabric manufacturing method capable of stably producing a fabric having a maximum circumferential elongation of 200% in a circular knitted fabric, and a maximum elongation in the circumferential direction. It is to provide a circular knitted fabric and work clothes that will be 200%.

  The manufacturing method of the circular knitted fabric of the present invention forms a cylindrical circular knitting structure in which a stretchable insertion yarn is knitted in the course direction while making a stitch with a stretchable knitting yarn to increase the elongation rate in the circumferential direction. In the manufacturing method of circular knitted fabric, in order to feed the circular knitting machine to the circular knitting machine while increasing the elongation rate of the knitting yarn and the insertion yarn, respectively, predetermined positive feeding means are arranged in the path of the knitting yarn and the insertion yarn, respectively. The feeding means feeds the knitting yarn and the insertion yarn to the circular knitting machine while keeping the feeding amounts constant.

  According to the present invention, predetermined positive feed means are arranged in the path of the knitting yarn and the insertion yarn, respectively, and the positive feed means feeds the circular knitting machine while keeping the feed amounts of the knitting yarn and the insertion yarn constant. Therefore, these elastic yarns can be stably fed at a constant tension, and a cylindrical circular knitted structure having a large elongation in the longitudinal direction can be formed.

  The present invention is characterized in that the positive feeding means is configured by arranging one driven roller on two driving rollers.

  According to the present invention, the positive feed means can easily feed the knitting yarn and the insertion yarn to the circular knitting machine while keeping the feed amounts constant.

  The positive feeding means is preferably arranged at a position close to the circular knitting machine. It becomes easy to deliver to the circular knitting machine in a state where the tension applied to the elastic yarn is high. The positive feeding means may be operated asynchronously with the circular knitting machine or may be operated synchronously.

  For example, the positive feeding means includes one driven roller at a position above a point between two drive rollers arranged at intervals, and these drive rollers transmit power from one electric motor. Examples include a configuration that rotates synchronously via a mechanism, and a configuration that rotates synchronously from two electric motors via a power transmission mechanism. As the electric motor, an electric motor provided in the circular knitting machine may be used, or a separate and independent electric motor may be provided. Examples of the power transmission mechanism include a chain drive mechanism, a gear drive mechanism, and a belt drive mechanism. Elastic yarns are stretched between the driving roller and the driven roller, and the driven roller rotates in synchronization with the driving roller. For example, the drive roller is made of stainless steel, steel, ceramics, etc., in order to positively send out elastic yarn and increase wear resistance, and the driven roller is made of rubber, to increase frictional resistance. . The positive feeding means is also called a three-point roller because of its arrangement.

  Examples of the circular knitting machine include a flow circular knitting machine (circular knitting jersey machine), a molding circular knitting machine (garmet strength machine), and a small round machine (sock knitting machine). Sink circular knitting machines are suitable for knitting fabrics for cutting and sewing. The forming circular knitting machine is suitable for transferring the knitted fabric from the cuff knitting to the sleeve knitting. The Komaru machine is suitable for finishing products such as socks.

  In the present invention, tension control means for controlling the tension applied to the knitting yarn and the insertion yarn so as not to exceed the upper limits respectively on the upstream side of the positive feeding means is provided, and the tension control means allows the knitting yarn and the insertion yarn to be respectively transmitted. It is characterized in that the positive feed means is fed out while keeping the tension in a certain range.

  According to the present invention, it is easy to apply high tension to the insertion yarn, and it is easy to stabilize the tension on the knitting yarn and the insertion yarn. In order to further reduce variation in tension applied to the elastic yarn, it is preferable that the tension control means is disposed at a position away from the positive feeding means.

  The tension control means is a control mechanism that controls using the principle of leverage (or the principle of yajirobe). For example, the tension control means is composed of a control frame provided with a yarn feed roller, a limit switch, and an electric yarn feed roller, and is lifted or lowered like a seesaw (or a jar) by an external force (tension). It is the arrangement configuration. More specifically, as the elastic yarn is stretched and its tension increases, the roller on the front end of the control frame rises, the limit switch is turned on at the upper limit of the tension, and the electric yarn feed roller rotates. When the elastic yarn is supplied and the elastic yarn loosens and its tension decreases, the roller on the tip side of the control frame descends, the limit switch is turned off at the lower limit of the elastic yarn tension, the electric yarn feed roller stops, and the elastic yarn Supply stops.

  A stretchable yarn (elastic yarn) is applied to the knitting yarn and the insertion yarn. As the elastic yarn, a stretchable yarn made of polyurethane, latex, elastomer, natural rubber, etc., a composite yarn of these, And twisted yarns.

  In the present invention, polyurethane elastic yarn is used for the knitting yarn and the insertion yarn, the elongation rate of the knitting yarn and the insertion yarn is 200% or more and less than 500%, and the elongation rate of the insertion yarn is higher than the elongation rate of the knitting yarn. It is preferable to set a large value.

  According to the present invention, when the circular knitted fabric has N1 as the power when the circumferential elongation is 50% and N2 when the circumferential elongation is 150%, N2 is It becomes a knitted structure that is less than three times N1, and it is easy to form a circular knitted fabric that requires a small amount of power to obtain a large elongation rate. In order to obtain the elongation required for the present invention, the elongation of the knitting yarn and the insertion yarn needs to be 200% or more. In order to improve the resilience of the expansion / contraction, the elongation of the knitting yarn and the insertion yarn is required. The rate should be less than 500%.

  The present invention is characterized in that after the circular knitted structure is formed, water immersion, steam heating, washing, and drying are performed, and then heat shrinkage is performed without applying a tension load in the circumferential direction of the knitted structure. .

  According to the present invention, it is possible to form a circular knitted fabric that has a higher elongation rate than before and requires less power to obtain a larger elongation rate without losing much the inherent elongation rate of the knitted structure. Can be easily done.

  The circular knitted fabric of the present invention has a cylindrical circular knitting structure formed by knitting a stretchable insertion yarn in the course direction while making a stitch with a stretchable knitting yarn, and the knitting yarn and the insertion yarn are polyurethane. , Latex, elastomer, natural rubber, or any two or more elastic yarns, and the knitting yarn and the insertion yarn are knitted with the elongation rate set to 200% or more and less than 500%. N2 is less than 3 times N1, where N1 is the power when the elongation is 50% and N2 is the power when the elongation in the circumferential direction is 150%.

  According to the present invention, it is possible to cover a range of 1 to 2.5 times in length with a single predetermined size, and the pressure on the body can be reduced. Easy to wear and comfortable to wear.

  The work clothes of the present invention are characterized in that the above-described circular knit fabric according to the present invention is used for either or both of the cuffs and the hem.

  According to the present invention, since the outer peripheral length of the wrist or ankle can cover a range of 1 to 2.5 times with a single predetermined size and the pressure on the body can be reduced, the fall of body hair can be prevented. It is prevented and it is reduced that the wrist and ankle are tightened and feel painful. In addition, even when the strength of the legs, waist and arms is weak, the work clothes are easy to wear and comfortable to wear.

  According to the method for manufacturing a circular knitted fabric of the present invention, predetermined positive feeding means are respectively arranged in the path of the knitting yarn and the insertion yarn, and the feed amounts of the knitting yarn and the insertion yarn are respectively constant by these positive feeding means. Therefore, these elastic yarns can be stably fed at a constant tension, and a cylindrical circular knitting structure having a large elongation rate in the circumferential direction can be formed. And it becomes easy to stabilize the tension | tensile_strength to a knitting yarn and an insertion yarn by arrange | positioning a tension | tensile_strength control means to the upstream of the said positive feed means.

  The work clothes made of the circular knitted fabric of the present invention can cover the range of the outer peripheral length of the wrist or ankle from 1 to 2.5 times with a single predetermined size, and the pressure on the body can be reduced. Therefore, the fall of body hair is prevented, and it is reduced that the wrist and ankle are tightened and feel painful. In addition, even when the strength of the legs, waist and arms is weak, the work clothes are easy to wear and comfortable to wear.

It is a figure which shows functionally the knitting process of the circular knitted fabric of embodiment of this invention. It is a perspective view which shows the positive feeding means of the knitting process of the said embodiment. It is a figure which shows the tension control means of the knitting process of the said embodiment, (a) is a figure which shows the state where tension became high, (b) is a figure which shows the state where tension became low. It is a figure which shows functionally the water immersion, steam heating, washing | cleaning, and drying process of the circular knitted fabric of embodiment of this invention. It is a figure which shows functionally the heating process of the circular knitted fabric of embodiment of this invention. It is a flowchart figure which illustrates the manufacture procedure of the circular knitted fabric of embodiment of this invention. It is an organization chart which illustrates the knitting organization of the circular knitted fabric of the embodiment of the present invention. It is a figure which illustrates the cuff part of the work clothes using the circular knitted fabric of embodiment of this invention. It is a graph which compares and shows the relationship between the expansion | extension rate of circular knitted fabric, and power with this invention product and a conventional product, respectively.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Circle fabric)
FIG. 7 is a structure diagram illustrating a knitting structure of the circular knitted fabric 1e (1) to which the present invention is applied. The circular knitted fabric 1 of this embodiment is a cylindrical fabric and exhibits high stretchability in the circumferential direction. Reference numeral 2 is a stretchable knitting yarn formed with stitches, and reference numeral 3 is a stretchable insertion yarn knitted in the course direction, and a cylindrical circular knitting structure is formed by these yarns. Here, the knitting yarn 2 and the insertion yarn 3 are elastic yarns, and more specifically, any one of polyurethane, latex, elastomer, and natural rubber, or an elastic yarn using two or more of them. The elongation rate of the knitting yarn 2 and the insertion yarn 3 is set to 200% or more and less than 500% and is knitted by a circular knitting machine. As the circular knitting machine, any one of a flow circular knitting machine (circular knitting jersey machine), a molding circular knitting machine (garmet strength machine), and a small round machine (sock knitting machine) is applied. As a result, the circular knitted fabric 1 is uniformly stretched in the circumferential direction, and the circular knitted fabric 1 is hard to fray and has high stretchability.

(Method of manufacturing circular knitted fabric)
FIG. 6 is a flowchart illustrating the manufacturing procedure of the circular knitted fabric 1 according to the embodiment of the invention. The manufacturing procedure of the circular knitted fabric 1 of the present embodiment includes warping (reference S1), knitting (reference S2), water immersion and steam heating (reference S3), cleaning and drying (reference S4), heating (reference S5), It consists of each process of winding (code | symbol S6) (FIG. 6). This will be described below based on the flowchart shown in FIG.

  Warping (reference S1) is a preparation process for knitting, in which a side yarn is wound around each of the knitting yarn 2 and the insertion yarn 3 while the elastic yarn of the core yarn is stretched. As a guideline for setting the elongation rate when covering, the knitting yarn 2 is 350% to 450%, and the insertion yarn is 400% to 600%. The standard of the count (thickness) of the knitting yarn 2 to be used is 20-40 denier for the core yarn and 30-100 denier for the side yarn. Moreover, the standard of the count (thickness) of the insertion thread 3 to be used is 140 to 1680 denier for the core thread and 30 to 300 denier for the side thread. It should be noted that there is a case where the covered yarn is purchased or the cover is not covered depending on the application. Next, in order to reduce variations in the yarn supply amount, beam warping is performed in which a plurality of yarns are aligned and wound around the beam.

  FIG. 1 is a diagram functionally showing a knitting process (knitting apparatus 10) (reference numeral S2) of the circular knitted fabric 1 of the present embodiment. The knitting apparatus 10 according to the present embodiment is configured to knit the yarn supplied from the beam 20 arranged on the upstream side by the circular knitting machine 40 arranged on the downstream side (FIG. 1).

  In the present embodiment, a sink circular knitting machine (circular knitting jersey machine) is used as the circular knitting machine 40. This is because it is easy to knit into a fabric shape.

  In the present embodiment, in order to feed the circular knitting machine 40 while increasing the elongation rates of the knitting yarn 2 and the insertion yarn 3, respectively, positive feeding means 30 are arranged in the path of the knitting yarn 2 and the insertion yarn 3, respectively. The positive feed means 30 feeds the knitting yarn 2 and the insertion yarn 3 to the circular knitting machine 40 while keeping the feed amounts constant. The positive feeding means 30 is arranged upstream of a position close to the circular knitting machine 40 in order to facilitate delivery to the circular knitting machine 40 with a high tension applied to the knitting yarn 2 and the insertion yarn 3. Yes.

  FIG. 2 is a perspective view showing the positive feeding means 30 (32). The positive feeding means 32 has a configuration in which a driven roller 323 is arranged directly above an intermediate point between the upstream driving roller 321 and the downstream driving roller 322. The drive rollers 321 and 322 are configured to rotate synchronously from the electric motor 32M via a power transmission mechanism such as a chain drive mechanism. The drive rollers 321 and 322 are rotatably mounted between the side walls of the standing frames 325 and 323 via bearings or the like. The driving rollers 321 and 322 are fixed in position. On the other hand, the driven roller 323 has its shaft 3231 placed in a recess 3251 formed on the inner side walls of the standing frames 325 and 323, and is rotatable and swingable. Here, the driven roller 323 is not in direct contact with the driving rollers 321 and 322, but the knitting yarn 2 (or the insertion yarn 3) is bridged between the driving rollers 321 and 322 and the driven roller 323. Since the elastic yarn 2 is under high tension, the driven roller 323 rotates synchronously with the drive rollers 321 and 322. For example, the driving rollers 321 and 322 are made of stainless steel, steel, ceramics or the like in order to positively send out the elastic yarns 2 and 3 and increase the wear resistance, and the driven roller 323 is rubber to increase the frictional resistance. It is made. The positive feeding means 30 may be operated asynchronously with the circular knitting machine 40 or may be operated synchronously. Reference numeral 41 </ b> M is an electric motor that drives the fabric take-up roller 411 in the circular knitting machine 40. In addition, this embodiment is not restricted to said structure, The said driven roller 323 is good also as a structure which contacts the driving rollers 321,322.

  According to the present embodiment, the positive feed means 30 are arranged in the path of the knitting yarn 2 and the insertion yarn 3, respectively, and the feed amounts of the knitting yarn 2 and the insertion yarn 3 are kept constant by the positive feed means 30, respectively. However, since the elastic yarns 2 and 3 can be sent stably at a constant tension, the cylindrical circular knitting structure having a large elongation rate in the circumferential direction can be formed.

  According to the circular knitted fabric 1 of this embodiment, when the circular knitted fabric 1 is in an unstretched state, the deformation of the circular knitted fabric during repeated expansion and contraction is reduced by the effect of holding the insertion yarn 3 by the knitting yarn 2. The The speed ratio between the drive rollers 322 and 332 shown in FIG. 1 and the fabric take-up roller 411 in the circular knitting machine 40 is set as follows, for example. That is, assuming that the yarn feed speed of the fabric take-up roller 411 is 1 as a reference value, the speed of the driving roller 322 of the knitting yarn 2 is set to 4 to 5 times, and the speed of the driving roller 332 of the insertion yarn 3 is 0. The speed is set to 2 to 0.3 times. The present embodiment is not limited to the above-described configuration as long as the insertion yarn 3 is held by the knitting yarn 2 when the circular knitted fabric 1 is in an unstretched state.

  In the present embodiment, the circular knitted fabric 1 is obtained by setting the elongation rate of the knitting yarn 2 and the insertion yarn 3 to 200% or more and less than 500% and setting the elongation rate of the insertion yarn to be larger than the elongation rate of the knitting yarn.

  In the present embodiment, tension control means 50 for controlling the tension applied to the knitting yarn 2 and the insertion yarn 3 so as not to exceed the upper limits on the upstream side of the positive feeding means 30 and on the side close to the beam 20, respectively. ing. In order to reduce the variation in tension applied to the elastic yarns 2 and 3 as much as possible, the tension control means 50 is disposed at a position away from the positive feeding means 30. In the example shown in FIG. It is arranged at a remote location.

  FIG. 3 is a diagram illustrating the tension control means 50. The tension control means 50 includes a control frame 526 provided with a yarn feed roller 525, a limit switch 527, and an electric yarn feed roller 521. Reference numeral 52M denotes an electric motor. The tension control means 50 has an arrangement configuration in which it rises and falls like a seesaw (or yajirobe) by an external force (tension). The tension control means 50 controls the electric yarn feed roller 521 by turning on / off the limit switch 527 when the control frame 526 provided with the yarn feed roller 525 performs an operation similar to that of the yarn feed roller 525. That is, as the elastic yarn 2 is stretched and the tension is increased, the roller 525 at the front end of the control frame is raised, the limit switch 525 is turned on at the upper limit of the tension (FIG. 3A), and the electric motor 52M is started. When the electric yarn feeding roller 521 rotates and the elastic yarn 2 is supplied, and the elastic yarn 2 is loosened and its tension is lowered, the roller 525 at the front end of the control frame is lowered, and the limit switch 527 is at the lower limit of the tension of the elastic yarn 2. Becomes OFF, the electric motor 52M stops, the electric yarn feeding roller 525 stops, and the supply of the elastic yarn 2 stops (FIG. 3B). The upper and lower limits of the tension of the elastic yarn 2 can be adjusted at the position where the limit switch 527 is turned ON / OFF, and the tension of the elastic yarn 2 can also be added by adding a weight to the front end side or the rear end side of the control frame 526. The upper and lower limits can be adjusted.

  According to the present embodiment, the tension control means 50 feeds the knitting yarn 2 and the insertion yarn 3 to the active feeding means 30 while keeping the tension to the knitting yarn 2 and the insertion yarn 3 within a certain range, thereby providing the tension to the knitting yarn 2 and the insertion yarn 3. It becomes easy to stabilize. In the tension control means 50, the limit switch 525 is turned ON at the upper limit of the tension of the elastic yarn 2, the electric yarn feeding roller 521 is rotated and the elastic yarn 2 is supplied, and the limit is set at the lower limit of the tension of the elastic yarn 2. It is sufficient that the switch 527 is turned OFF, the electric yarn feeding roller 525 is stopped, and the supply of the elastic yarn 2 is stopped, and is not limited to the above-described embodiment.

  FIG. 4 is a diagram functionally showing the water immersion and steam heating (symbol S3) of the circular knitted fabric 1 of the present embodiment, and the cleaning and drying (symbol S4) in the next process. The circular knitted fabric 1a knitted in the knitting process (reference S2) is immersed in the water tank 61, steamed with high-temperature steam in the steaming box 65, and the fabric is heat-shrinked to obtain a circular knitted fabric 1b. (Reference S3). The water temperature in the water tank 61 is a normal temperature of 10 to 30 ° C. The temperature of the high temperature steam in the steaming box 65 is 104 to 106 ° C. Here, if the water in the water tank 61 is used as the dyeing solution, the dyed circular knitted fabric 1 can be obtained in the same process as described above.

  The circular knitted fabric 1b steam-heated by the water immersion and steam heating (symbol S3) is immersed in a cleaning solution in a plurality of soaping tanks 70 to become a circular knitted fabric 1c, and dried by a drying drum 80 to be circular knitted fabric 1d. (Reference S4). The soaping is a step of washing oil and dirt adhering to the yarn constituting the circular knitted fabric 1b with a washing liquid, and the temperature of the washing liquid is 40 to 60 ° C. The cleaning liquid may be an existing one. Then, the washed circular knitted fabric 1c is dried by the drying drum 80 at a drying temperature of 100 to 120 ° C. to become a circular knitted fabric 1d. The temperature condition described above is an example in which the elastic yarns 2 and 3 are polyurethane yarns, and is not limited to the temperature condition described above, but any of the yarns constituting the circular knitted fabric 1 is hot. The temperature must not be raised to a temperature range where plasticity is manifested. This is so as not to interfere with the further shrinkage of the dough in the next heating step.

  The circular knitted fabric 1d washed and dried in the washing and drying step (reference S4) is heated and shrunk in a tumbler box 95 (reference S5), and is naturally cooled or forcedly cooled by a blower fan or the like to form the circular knitted fabric 1e. (Reference S6). The tumbler box 95 has a tunnel shape and is provided with a belt conveyor 92 provided with a heater. A delivery-side roller 91 is disposed on the inlet side of the tumbler box 95, and a take-up roller 97 is disposed on the outlet side of the tumbler box 95. The circular knitted fabric 1d is nipped in a state where the tension is almost zero by the feeding side roller 91 and the winding side roller 97, and fed while being heated by the belt conveyor 92. In other words, the circular knitted fabric 1d is heated and shrunk while maintaining a loose state to some extent to become a circular knitted fabric 1e. The heating temperature by the belt conveyor 92 is 190 to 195 ° C., and the heating time is 60 to 90 seconds. The temperature condition described above is an example in which the elastic yarns 2 and 3 are polyurethane yarns, and is not limited to the temperature condition described above, but any of the yarns constituting the circular knitted fabric 1 is hot. By raising the temperature to a temperature range in which plasticity is expressed or to a range close thereto, the yarns are hardly frayed. Here, for example, the tension applied to the circular knitted fabric 1d is made zero by decelerating the rotational speed of the take-up roller 97 with respect to the rotational speed of the feed-side roller 91, and the circular knitted fabric 1d is loosened. The rotation speed of the take-up roller 97 is adjusted to such an extent that does not increase. The completed circular knitted fabric 1e is wound or cut into a predetermined length to become a part of clothes.

(Example)
Circular knitted fabric 1 was produced using commercially available polyurethane yarn as knitting yarn 2 and insertion yarn 3. For the product of the present invention and a conventional product made of the same type of yarn material, a power test at the time of expansion and contraction was performed, respectively. In the power test, the test method was a constant-speed extension tensile tester, and the tensile speed was 30 cm / min for the entire width with a gripping interval of 10 cm. The results are shown in Table 1 below.

  From Table 1, the product of the present invention is a circular knitted fabric that stretches better than the conventional product. For example, the power required for expansion when the expansion rate is 80% is 26.32 [N] in the conventional product, while 11.18 [N] in the present product, which is less than half. Power is enough. And, for example, when stretched with the same level of power as the conventional product, the stretch rate of the conventional product is 80%, whereas the stretch rate of the product of the present invention is 190%, and doubles with the same power. It turns out that it extends more.

  FIG. 9 is a graph showing a comparison of the relationship between the stretch rate and power of the circular knitted fabric in the product of the present invention shown in Table 1 and the conventional product. The horizontal axis of the graph is the expansion rate [%], and the vertical axis of the graph is the power [N]. In the hysteresis curve in the graph, with the peak point as a boundary, the upper line is an extension curve, and the lower line is a contraction curve (recovery curve).

  According to Table 1 and FIG. 9, the product according to the present invention has a power of 6.93 [N] when the elongation rate (elongation rate in the circumferential direction) is 40%, and the power when the elongation rate is 80%. Since it is 11.18 [N], the required power is as small as about 1.6 times in order to double the expansion rate. However, the conventional product has a power of 9.12 [N] when the expansion rate (elongation rate in the circumferential direction) is 40%, and a power of 26.32 [N] when the expansion rate is 80%. Therefore, in order to double the expansion rate, the required power is as large as about 2.9 times. The product of the present invention is knitted with a circular knitting machine with the elongation rate of the knitting yarn and the insertion yarn set to 200% or more and less than 500%, and the elongation rate (elongation rate in the circumferential direction) is 50%. Power is 7.96 [N], and when the expansion rate is 150%, the power is 20.44 [N], so the expansion rate is 3 times, while the required power is about 2.6 times. That's it. That is, when the expansion rate (elongation rate in the circumferential direction) is 50% and the power when the expansion rate is 150% is N2, N2 is less than 3 times N1. In Example (product of the present invention), the hysteresis curve has a smaller slope than the comparative example (conventional product). In addition, the product of the present invention requires 28.56 [N] when the elongation rate reaches 200%, and the power required when the elongation rate of the conventional product reaches 90% is 35.36 [N]. N]. From this, it can be considered that the product of the present invention requires less power than the conventional product for the power required to maximize the expansion rate. Therefore, for example, when the product of the present invention is pulled with a power of 35 [N], the elongation rate of the product of the present invention exceeds 200%. According to the present invention, in a circular knitted fabric, a fabric having a circumferential elongation of 200% or more can be stably produced, and further, the circumferential elongation can be up to 300%. It is also possible to produce a stable dough stably.

(Application to work clothes)
FIG. 8 is a diagram illustrating the cuff portion 101 of the work clothes 100 using the circular knitted fabric according to the embodiment of the invention. The width of the cuff portion is about 50 to 100 mm. In order to prevent the fall of body hair, it is necessary to reduce the gap between the cuff and the wrist as much as possible. In the case of using a conventional circular knitted fabric, the wrist has been pressed because the range of elongation rate per unit power is narrow. When the circular knitted fabric of the product of the present invention is used, the stretch rate range per unit power is wide, so that the wrist is not squeezed and the wear feeling is excellent (FIG. 8). According to the present invention, since the outer peripheral length of the wrist or ankle can cover a range of 1 to 2.5 times with a single predetermined size and the pressure on the body can be reduced, the fall of body hair can be prevented. It is prevented and it is reduced that the wrist and ankle are tightened and feel painful. In addition, even when the strength of the legs, waist and arms is weak, the work clothes are easy to wear and comfortable to wear.

  The knitting yarn 2 and the insertion yarn 3 may be yarns of the same material, or may be yarns of different materials, diameters and colors. The method of knitting the circular knitting is not limited to the above-described embodiment, and so-called knit, tack, and welt can be applied. The circular knitting machine is not limited to the above-described embodiment, and it is also possible to perform knitting with a milling knitting machine or a links and linking knitting machine. Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

1, 1a, 1b, 1c, 1d, 1e Circular knitted fabric,
2 Knitting yarn,
3 Insertion thread,
20 beams,
30 Aggressive feeding means,
321 and 322 driving rollers,
323 driven roller,
50 Tension control means

Claims (9)

  In a method for producing a circular knitted fabric in which a stretched insertion yarn is knitted in a course direction while forming a stitch with a stretchable knitting yarn to increase a circumferential elongation rate, In order to feed the circular yarn knitting machine while increasing the elongation rate of each insertion yarn, predetermined positive feeding means are arranged in the path of the knitting yarn and the insertion yarn, respectively, and the feed amount of the knitting yarn and the insertion yarn by these positive feeding means. A method for producing a circular knitted fabric, characterized in that the knitted fabric is fed to a circular knitting machine while keeping each constant.   2. The method for producing a circular knitted fabric according to claim 1, wherein the positive feeding means is configured by arranging one driven roller on two drive rollers.   Tension control means for controlling the tension applied to the knitting yarn and the insertion yarn so as not to exceed the upper limit respectively is arranged upstream of the positive feeding means, and the tension on the knitting yarn and the insertion yarn is kept constant by these tension control means. 3. The method for manufacturing a circular knitted fabric according to claim 1, wherein the circular knitted fabric is fed to the positive feeding means while being within a range.   Polyurethane elastic yarn is used for the knitting yarn and the insertion yarn, the elongation rate of the knitting yarn and the insertion yarn is set to 200% or more and less than 500%, and the elongation rate of the insertion yarn is set larger than the elongation rate of the knitting yarn. The method for producing a circular knitted fabric according to any one of claims 1 to 3.   After the circular knitted structure is formed, water immersion, steam heating, washing, and drying are performed, and then heat shrinkage is performed without applying a tension load in the circumferential direction of the knitted structure. 5. The method for producing a circular knitted fabric according to any one of 4 above.   A circular knitted fabric manufactured by the method for manufacturing a circular knitted fabric according to any one of claims 1 to 5.   It has a cylindrical circular knitting structure formed by knitting elastic insertion yarns in the course direction while creating stitches with elastic knitting yarns, and the knitting yarns and insertion yarns are made of polyurethane, latex, elastomer, natural rubber Either one or two or more kinds of elastic yarns are used, and the knitting yarn and the insertion yarn are knitted with the elongation rate set to 200% or more and less than 500%, and the circumferential elongation rate is 50%. A circular knitted fabric characterized in that N2 is less than three times N1 when the power is N1 and the power when the circumferential elongation is 150% is N2.   The circular knitted fabric according to claim 7, wherein the circular knitted fabric is knitted by any one of a flowing circular knitting machine, a molding circular knitting machine, and a small circular machine.   Work clothes characterized in that the circular knitted fabric according to any one of claims 5 to 8 is used for either a cuff or a hem.