JP2007056399A - Special plied yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plied yarn scarcely fraying even by cutting with a sharp edged tool such as scissors or a cutter and scarcely loosening a knot even in a state wetted with water. <P>SOLUTION: The plied yarn comprises a textured yarn composed of synthetic fibers, preferably polyester filaments and having loop fluffs and a polymer having a lower melting point than that of the synthetic fibers by ≥10°C (preferably binder fibers composed of the polymer). The plied yarn is suitable as a tailoring yarn for net fabrics and improves the operation efficiency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a special twisted yarn in which knots are difficult to loosen and fibers in a cut portion are difficult to be unwound.

  Conventionally, yarns that are difficult to loosen knots of yarns have been demanded for various applications. For example, as tailored yarns for netting used for connecting nets and repairing damaged parts, they closely adhere to knots tied to nets and ropes. In order to apply a strong frictional force between fibers, one made of short fiber spun yarn having a fluffy peripheral surface is used. The short fiber spun yarn is bound by a frictional force acting between twisted and closely attached short fibers, and a strength corresponding to the tension is given by the frictional force acting between the short fibers, and as a yarn The form is maintained.

  However, in the case of the short fiber spun yarn as described above, when it gets wet in rainy weather outdoors or when it is submerged in water, water penetrates into the short fiber spun yarn, and the space between the short fibers Acts like a slippery lubricant, reducing the frictional force between the short fibers. For this reason, there is a problem that knots are easily loosened in the case of synthetic fiber spun yarn lacking hygroscopic swelling. In contrast, cellulose fibers such as hemp and cotton that are highly hygroscopic and swellable absorb and swell and thicken the cellulose fibers in water, increasing the adhesion between short fibers, but water acts like a lubricant. This is the same as in the case of synthetic fiber spun yarn, and there is a problem in terms of durability because it is easily corroded and deteriorated.

In order to solve the above problems, a tailored yarn for netting formed by twisting a processed yarn made of polyester continuous fibers having loop fluff has been proposed (see, for example, Patent Documents 1 and 2). However, when these are used for repair of netting or the like, there is a problem that when the repair work is performed with a sharp knife such as scissors or a cutter, the tip of the cut twisted yarn is unwound and the workability is inferior. there were. In order to prevent such unraveling, it can be dealt with by using a lighter, a heat cutter, or the like, but after all, workability is poor and new safety problems such as burns will arise.
3-1980 JP2001-103870

  In view of the above problems, an object of the present invention is to provide a twisted yarn that is difficult to unravel even by cutting with a sharp blade such as scissors or a cutter, and that does not loosen the knot even when wet. is there.

The present invention can solve the above-mentioned problems, and the gist thereof is as follows.
(1) A twisted yarn comprising a processed yarn having loop fluff made of a synthetic fiber and a polymer having a melting point at least 10 ° C. lower than the melting point of the synthetic fiber.
(2) The twisted yarn according to (1) above, wherein the processed yarn having loop fluff is made of polyester continuous fiber.
(3) The twisted yarn according to (1) or (2), which is a tailored yarn for netting.

  The twisted yarn of the present invention contains a processed yarn having loop fluff made of synthetic fibers, so that the loop fluff causes fine irregularities on the surface of the twisted yarn, which strongly adheres the knot at the time of knotting. Even if water enters, it is difficult to loosen. Further, by including a polymer having a melting point at least 10 ° C. lower than the melting point of the synthetic fiber constituting the processed yarn, this polymer functions as a thermal binder, and binds the constituent fibers of the twisted yarn. Strengthen. Therefore, the twisted yarn of the present invention is difficult to break even when cut with a sharp blade such as scissors or a cutter, and when knotted, the knot is difficult to break even when wet, so various applications that require knotting For example, it can be suitably used for a strapping string, a rope, a net or the like for packing. In particular, since the fibers are difficult to break at the time of cutting, it is most suitable as tailoring yarn for netting used for tailoring or repairing netting such as fishing nets, and the workability is greatly improved.

  Hereinafter, the present invention will be described in detail.

  The twisted yarn of the present invention includes a processed yarn having loop fluff made of synthetic fiber. Hereinafter, the processed yarn having loop fluff made of synthetic fiber may be simply abbreviated as “loop processed yarn”.

  The loop processed yarn used in the present invention can be obtained, for example, by subjecting a synthetic fiber to fluid disturbance treatment in an overfeed state using an air processing machine using air as a fluid. The size of the loop and the number of loops are not particularly limited, and in the case of the fluid disturbance process described above, the overfeed rate, fluid speed, and processing speed may be adjusted as appropriate.

  The looped yarn of the present invention contains loop processed yarn, so that there is loop fluff on the surface of the twisted yarn. When the twisted yarn is knotted, the surfaces of the twisted yarn are brought together by the frictional action of the loop fluff. Since it is difficult to slip, the knot is difficult to loosen. Therefore, the content of the loop processed yarn is not particularly limited, but considering the difficulty of loosening the knot, it is preferably 30% by mass or more, more preferably 50% by mass or more based on the total mass of the twisted yarn. preferable.

  The single yarn fineness of the loop processed yarn is preferably 4.5 to 17 dtex, and more preferably 6.6 to 13 dtex.

  In the twisted yarn of the present invention, when fibers other than the loop processed yarn (hereinafter referred to as “other fibers”) are included, the other fibers are also preferably synthetic fibers.

  The polymer forming the synthetic fiber used in the present invention is not particularly limited, and various polymers known as fiber-forming thermoplastic polymers, including polyester and polyamide, should be used. Most preferred is polyester.

  Examples of polyesters include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalene-2-6-dicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid and sebacic acid, or esters thereof, and ethylene glycol, Examples include homopolyester polymers or copolymers having diol compounds such as diethylene glycol, 1,4-butadiol, neopentyl glycol, and cyclohexane-1,4-dimethanol as ester components. These polyesters may be added or copolymerized with paraoxybenzoic acid, 5-sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythritol and the like. Furthermore, it may be a biodegradable polyester, specifically, polylactic acid-based heavy polymers such as poly-D-lactic acid, poly-L-lactic acid, poly-D / L-lactic acid copolymer and polylactic acid stereocomplex. Copolymers, polybutylene succinates, polyethylene succinates, poly (ε-caprolactone) and other biodegradable polyester polymers may be copolymerized.

  Polyamides include polyimino-1-oxotetramethylene (nylon 4), polytetramethylene adipamide (nylon 46), polycoupleramide (nylon 6), polyhexamethylene adipamide (nylon 66), polyundecanamide (nylon). 11), polylaurolactamide (nylon 12), polymetaxylene adipamide, or a polyamide copolymer having these monomers as constituent units.

  Needless to say, a plurality of polymers may be used in combination as the polymer forming the synthetic fiber. In addition, various additives such as matting agents, pigments, light stabilizers, heat stabilizers, antioxidants and the like are included in the synthetic fiber as long as they do not impair the effects of the present invention. Also good.

  The cross-sectional shape of the synthetic fiber is not particularly limited, and in addition to the most general round shape, for example, any shape such as a cross shape, a-shape, a rhombus, a T shape, a Y shape, a triangle, a quadrilateral shape, etc. There may be.

  As the synthetic fiber, long fiber is preferable, but spun yarn may be included in a part of the twisted yarn.

  The twisted yarn of the present invention needs to contain a polymer having a melting point that is at least 10 ° C. lower than the melting point of the synthetic fiber constituting the loop-processed yarn (hereinafter referred to as “low melting point polymer”). . As a result, the low melting point polymer functions as a binder to strengthen the binding of the twisted yarn, and it becomes difficult to unravel when cut with a sharp blade such as scissors or a cutter. The melting point of the low melting point polymer is preferably 115 ° C. or higher. For example, when the synthetic fiber constituting the loop-processed yarn is a polyester fiber mainly composed of polyethylene terephthalate, the low melting point polymer is particularly preferably a copolyester having a melting point of about 120 to 220 ° C.

  As a mode of containing a low melting point polymer, a fiber composed of only a low melting point polymer, or a composite fiber composed of a low melting point polymer and a polymer having a higher melting point is used as a so-called binder fiber in a twisted yarn. It is preferable to heat-treat at a temperature that is preferably equal to or higher than the melting point of the low-melting point resin and lower than the melting point of the synthetic fiber constituting the looped yarn. As such a binder fiber, a core-sheath type composite fiber having a low melting point polymer as a sheath component and a polymer having a higher melting point as a core component is particularly preferable. For example, the core component is polyethylene terephthalate, and the sheath component is The thing comprised by the low melting point copolyester is mentioned.

  The content of the low-melting-point polymer in the twisted yarn is not particularly limited. However, if the amount is too small, the effect of making the twisted yarn difficult to unravel is poor. On the other hand, if the amount is too large, the twisted yarn becomes hard or loop fluff. May be covered with a low-melting-point polymer, which may hinder the difficulty of loosening the knot. Therefore, the content of the low-melting polymer is preferably 1 to 20%, more preferably 3 to 15%, based on the total mass of the twisted yarn.

  The structure of the twisted yarn of the present invention will be described with reference to FIG. In the twisted yarn of the present invention, a plurality of twisted yarns 2 are twisted to form a twisted yarn 1, and each twisted yarn 2 is also composed of a plurality of yarns. Is called component yarn 3. The constituent yarn 3 is composed of a plurality of single yarns, and in the twisted yarn of the present invention, a loop processed yarn is used as at least a part of the constituent yarn 3. In FIG. 1, not every single yarn is shown.

  As the number of twisted yarns 2 constituting the twisted yarn 1, 2 to 8 are preferable. Moreover, as a total number of the component yarn 3 in the twisted yarn 1, 6-50 are preferable, 10-30 are more preferable, and 12-30 are especially preferable.

  The constituent yarn 3 is preferably a multifilament composed of single filaments of long fibers, and as the number of filaments, the total number of filaments per constituent yarn 3 is preferably 40 to 300, More preferably, the number is 48 to 250.

  The twisting directions of the twisted yarns 2 are preferably the same direction. That is, it is preferable that all the twisted yarns 2 are S-twisted or all the twisted yarns 2 are Z-twisted. And it is preferable that the twisting direction when the plurality of twisted yarns 2 are twisted into the twisted yarn 3 is opposite to the twisting direction of the twisted yarn 2 described above. That is, it is preferable to reverse the twist directions of the lower twist and the upper twist, and when the lower twist is the S twist, the upper twist is the Z twist, and when the lower twist is the Z twist, the upper twist is the S twist. By setting it as the combination of such a twist direction, it can prevent that the force of a twist return acts. When a twisting force is generated, it works in a direction that facilitates unraveling when it is cut with a sharp blade such as scissors or a cutter.

  Moreover, it is preferable that the number of twists of the upper twist is not more than half of the number of twists of the lower twist. By doing so, it can suppress that the twisted yarn is stretched by tension. In other words, if the number of twists of the upper twist is set to be less than half of the number of twists of the lower twist, even after finishing the twisted yarn 1 by twisting a plurality of twisted yarns 2, the twisting in the direction opposite to the upper twist is performed. Remains in the twisted yarn 1, so that when the tension acts on the twisted yarn 1 and an untwisting torque in the opposite direction to the upper twist is generated, the untwisting torque is in the same direction as the twisted direction remaining in the twisted yarn 2. This is because the synthetic fiber in the constituent yarn 3 is not easily stretched. In addition, as a twist number of a top twist, 30-250 T / M is preferable and 70-180 T / M is more preferable.

  As a preferred embodiment of containing the above-mentioned low melting point polymer as a binder fiber, in the twisted yarn 2, a yarn made of a binder fiber containing the low melting point polymer is used in combination as the constituent yarn 1, or the low melting point polymer is contained. This can be achieved by twisting a yarn composed of a binder fiber with a plurality of twisted yarns 2. Although the state of the twist is not particularly limited, the twisted yarns 2 can be efficiently fused together if they are present outside the twisted yarn 2.

  The binder fiber is preferably a spun yarn. This is because the spun yarn can advantageously affect the difficulty of loosening the knot.

Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. Various characteristics in the examples were measured or evaluated as follows.
(A) Strong elongation According to JIS L-1013, the sample length was 25 cm and the tensile rate was 30 cm / min. As a tensile tester, Shimadzu Autograph DSS-500 was used.
(B) Difficulty in loosening of knots By letting 10 people perform the work of unraveling the knots by hand by using single twisted knots, let each person determine the difficulty of loosening by ○ △ ×. The decision result with the largest number of people was adopted. ○ indicates that it is most difficult to loosen, and X indicates that it is most likely to loosen
(C) Unraveling at the time of cutting The combined twisted yarn was cut with sharp scissors, and the unraveled length was measured. The shorter the length, the harder it is to solve.

Example 1
Black original polyester fiber (Unitika Fiber Co., Ltd., product number S132B, 940 decitex / 96 filament) is used with an air processing machine (Aiki Seisakusho, AT-501EX type) with an overfeed rate of 15% and an air pressure of 6.5 kg. A polyester multifilament processed yarn having loop fluff was obtained by performing fluid disturbance treatment under the conditions of / cm ² and a yarn speed of 110 m / min. 4 polyester multifilament processed yarns and a spun yarn made of polyester core-sheath type (core / sheath = 1/1) composite binder fiber (Unity fiber "Expolan (trade name)" 10th E100 MBK) 1 The two were combined and aligned, and an S twist 450 T / M was twisted with a ring twisting machine (manufactured by Kyoritsu, ST-30 type) to obtain a twisted yarn. Next, three of these twisted yarns were drawn together and subjected to Z twist 152 T / M top twist, and then twisted to obtain a twisted yarn subjected to heat treatment at 130 ° C. for 2 minutes.

Example 2
Four polyester multifilament processed yarns used in Example 1 and one spun yarn made of composite binder fiber used in Example 1 were combined and aligned, and a ring twisting machine (manufactured by Kyoritsu, ST-30 type) The twisted yarn (A1) was made by applying an S twist 450T / M under twist. Separately, four polyester multifilament processed yarns used in Example 1 were aligned, and an S twist 450 T / M was twisted with a ring twisting machine (manufactured by Kyoritsu, ST-30 type) and the twisted yarn (B1). did. Next, the above two twisted yarns (A1) and one twisted yarn (B1) are combined together and twisted by applying an upper twist of Z twist 152T / M, followed by heat treatment at 130 ° C. for 2 minutes. The applied twisted yarn was obtained.

Example 3
A twisted yarn was obtained in the same manner as in Example 2, except that one twisted yarn (A1) and two twisted yarns (B1) were combined when applying the upper twist.

Comparative Example 1
A twisted yarn is obtained in the same manner as in Example 1 except that only the four polyester multifilament processed yarns are used without using the spun yarn composed of the composite binder fiber during the lower twisting, and no heat treatment is performed. It was.

  The evaluation results of the twisted yarns obtained in Examples 1 to 3 and Comparative Example 1 are shown in Table 1 below.

  From the results shown in Table 1, it can be seen that the twisted yarns of Examples 1 to 3 are difficult to loosen the knots and are excellent in difficulty of being unwound when cut. On the other hand, in Comparative Example 1, it can be seen that the fiber is easily unraveled at the time of cutting because the low melting point polymer is not contained.

Example 4
Black original polyester fiber (Unitika Fiber Co., Ltd., part number S132B, 1100 dtex / 96 filament) is used with an air processing machine (Aiki Seisakusho, AT-501EX type), overfeed rate 15%, air pressure 7 kg / cm ^2. A polyester multifilament processed yarn having loop fluff was obtained by performing fluid disturbance treatment under the condition of a yarn speed of 120 m / min. 4 polyester multifilament processed yarns and a spun yarn made of polyester core-sheath type (core / sheath = 1/1) composite binder fiber (Unity fiber "Expolan (trade name)" 10th E100 MBK) 1 The two were combined and aligned, and an S twist 270 T / M was twisted with a ring twisting machine (manufactured by Kyoritsu, ST-30 type) to obtain a twisted yarn. Next, three of these twisted yarns were drawn together and subjected to Z twist 120 T / M top twist to obtain a twisted yarn, which was then heat treated at 130 ° C. for 2 minutes.

Example 5
Four polyester multifilament processed yarns used in Example 4 and one spun yarn composed of the composite binder fiber used in Example 4 were combined and aligned, and a ring twisting machine (manufactured by Kyoritsu, ST-30 type) At S, a twisted yarn (A2) was obtained by applying an S twist of 270 T / M. Separately, four polyester multifilament processed yarns used in Example 4 were aligned, and an S twist 270 T / M and a twisted yarn (B2) were applied with a ring twisting machine (ST-30 model, manufactured by Kyoritsu). did. Next, the above two twisted yarns (A2) and one twisted yarn (B2) are combined together and twisted by applying an upper twist of Z twist 120T / M, followed by heat treatment at 130 ° C. for 2 minutes. The applied twisted yarn was obtained.

Example 6
A twisted yarn was obtained in the same manner as in Example 5 except that one twisted yarn (A2) and two twisted yarns (B2) were combined when applying the upper twist.

Comparative Example 2
A twisted yarn is obtained in the same manner as in Example 4 except that only four polyester multifilament processed yarns are used without using the spun yarn composed of the composite binder fiber at the time of the lower twist, and no heat treatment is performed. It was.

  The evaluation results of the twisted yarns obtained in Examples 4 to 6 and Comparative Example 2 are shown in Table 2 below.

  From the results shown in Table 2, it can be seen that the twisted yarns of Examples 4 to 6 are difficult to loosen the knot and are excellent in difficulty of being unwound when cut. On the other hand, in Comparative Example 2, it can be seen that the fibers are easily unwound at the time of cutting because the low melting point polymer is not contained.

It is a schematic diagram which shows the structure of a twisted yarn.

Explanation of symbols

1 Combined yarn 2 Twisted yarn 3 Constituent yarn

Claims (3)

A twisted yarn comprising a processed yarn having loop fluff made of synthetic fiber and a polymer having a melting point lower by at least 10 ° C than the melting point of the synthetic fiber. The yarn according to claim 1, wherein the processed yarn having loop fluff is made of a polyester long fiber. The twisted yarn according to claim 1 or 2, which is a tailored yarn for netting.