JPS6144977B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a bulky yarn by combining a spun yarn made of natural fibers and a filament yarn made of thermoplastic synthetic fibers. The present invention relates to a method for producing a bulky yarn having both the texture and the feel of a spun yarn of natural fibers. Many studies have already been attempted to bring the performance of synthetic fiber yarn closer to the moisture absorption, heat retention, texture, etc. of natural fiber spun yarn, but it is difficult to achieve properties that are exactly equivalent to natural fibers. This is impossible, and bulky crimped yarns made of synthetic fibers also have unique performance in terms of crimp properties that cannot be obtained with natural fibers. For this reason, many types of inter-knitted fabrics and inter-woven fabrics, and composite yarns, have been proposed in which both yarns are used as constituent materials, and in particular, various textures have been proposed to compensate for the shortcomings of both yarns and simultaneously combine their advantages. Composite yarns, which can be freely selected, have recently come into increasing use. However, in the case of intertwisted yarn produced by a twisting machine, which is one of the composite yarns currently in practical use, the difference in dyeing of the heathered yarn tone disappears even in the final product due to the difference in dyeability between natural fibers and synthetic fibers. In addition, in the case of false-twisted yarn using a pin-type spindle, which is another composite yarn that has been put into practical use, the heathered texture due to difference in dyeing is eliminated compared to mixed-twisted yarn, and the yarn is finely dispersed evenly. Although a dyed state can be obtained, the frictional resistance between the pin 1 of the false twisting element shown in FIG. There are cases where comrades come into contact with each other, and the threads may be squeezed and cut, or the natural fibers may harden into a slab, making it impossible to obtain high quality products. As a method to solve these drawbacks that occur in false-twisted composite yarns using a spindle-type twister, the applicant previously proposed a method for simultaneously false-twisting a natural fiber spun yarn and a thermoplastic synthetic filament yarn. proposed that false twisting be performed in the direction opposite to the ground twisting of natural fiber spun yarns, and that a disk-shaped friction twister be used as the false twisting element. According to this method, deterioration in yarn quality due to contact with the twister can be almost completely prevented, but some difference in dyeing in the heathered yarn tone remains, and in this respect it is still insufficient. The method of the present invention improves the above-mentioned manufacturing method previously provided by the applicant, and provides a new manufacturing method capable of manufacturing high-quality bulky composite yarns. When a spun yarn made of natural fibers is aligned and twisted, and then heat-treated while being continuously given false twist to form a bulky yarn, the twisting is performed in the same direction as the ground twist of the spun yarn. of
The twisting is performed at 100 to 300 T/m, and the false twisting is performed by a frictional false twisting method in which the yarn is brought into contact with the periphery of a rotating disk, and the false twisting is performed in the opposite direction to the ground twist of the spun yarn. This is a summary. The present invention will be specifically explained below based on the drawings. FIG. 2 is a schematic diagram showing the state of implementation of the method of the present invention, in which the spun yarn 3 of natural fibers is aligned with the thermoplastic synthetic filament yarn 4, and then twisted in the same way as the ground twist applied to the spun yarn 3. The yarn is twisted in the direction of 100 to 300 T/m, and in this state is introduced into the crimping process as a yarn to be processed. In this process, a heater 7 and a friction type twister 8 are installed between a supply roller 5 and a delivery roller 6, and the yarn to be processed is spun by the friction type twister 8 under an appropriate tension. The yarn 3 is false twisted in the opposite direction to the ground twist, that is, in the direction in which the original twist of 100 to 300 T/m is returned, and both yarns 3 and 4 are continuously heat-treated with a heater 7 while being entangled. be done. The yarn that has passed through the eight friction twisters is immediately untwisted, and both yarns 3 and 4 return to their original twisted state. At this time, the spun yarn 3
Each of the constituent fibers is held between the crimped filament yarns, and the two are mixed and integrated.
Moreover, the false twisting during this time is done by friction, and if the frictional force on the yarn to be processed exceeds a certain value, a slip will occur and the yarn will no longer be strained, so the tension during processing will be reduced. If the amount is adjusted appropriately, defects such as fiber stiffening will not occur even if the fibers are lightly twisted. In addition, since both constituent threads are aligned and twisted in advance, the produced thread loses its heathered texture and exhibits a finely dispersed marbled dyeing difference similar to that of a single yarn in a blended yarn. . The number of original twists given in advance to the processed yarn is
It is required to be 100 to 300 T/m, and if it is outside this range, the object of the present invention cannot be achieved.
In other words, if the twist number is less than 100T/m, the fine dispersion of dyeing differences, which is a feature of the present invention, is insufficient;
Twisting of 300 T/m or more is added to the ground twist of the natural fiber spun yarn, increasing the torque (force that tries to twist the yarn in the opposite direction to the direction in which the yarn itself is twisted), which can be used for the next process. Tight threads are generated when
Workability is significantly reduced. As shown in the following table, which shows the experimental results of the degree of fine dispersion of the heathered yarn tone during dyeing, a very favorable condition is obtained when the original twist number is 100 T/m or more.

[Table] The spun yarns used in the method of the present invention include:
Short fiber spun yarns such as cotton yarn, woolen yarn, hemp yarn, silk yarn, and synthetic fibers such as polyester or acrylic fibers can also be used depending on the purpose, and as thermoplastic synthetic filament yarns, mainly polyamide-based and polyester-based yarns can be used. It is desirable to use multifilament yarn. Example 1 A ^52S (meter count) worsted yarn with a twist in the Z direction and a 45d/36f polyester filament yarn were aligned, and then twisted at 150T/m in the Z direction.
A yarn to be processed was obtained. This was processed using the apparatus shown in FIG. In order to compare with the method of the present invention, the processed yarn was false-twisted using a conventional pin-type false-twisting machine. The processed yarns of both are as follows.

【table】 The results obtained by both methods are shown in the table below.

[Table] The processed yarn obtained by implementing the method of the present invention is
The ends of the worsted yarn are fluffed in a desirable manner on the surface of the polyester filament processed yarn, and both are integrated into the yarn, and the fabrics knitted and woven using this yarn have an even heathered texture after dyeing, and the texture is fine. The product was very similar to worsted yarn. However, the comparative example had problems with operability. In other words, in the case of the pin method, the yarn is wound once around a thin twisted yarn pin (1.5φ to 2φ) and runs while being twisted, so the yarns do not come into contact with each other while being wound around the twisted yarn pin. Raise and rub. Furthermore, the sheath yarn moves and becomes a lump, and the yarn becomes partially knotted in the longitudinal direction of the yarn, which prevents the yarn from running smoothly through the twisting yarn pins, leading to yarn breakage, resulting in poor operability. Nakatsuta. However, as mentioned above, in the case of the method of the present invention (friction method),
There was no contact or friction between the threads, and although the threads contacted the end face of the friction disk in the longitudinal direction, they were only bent, so there was little thread breakage, and the operability was good. Example 2 Hemp yarn with apparent fineness of 150d and twisted in the Z direction
75d/36f polyester filament yarn is aligned and twisted at 250T/m in the Z direction to obtain the processed yarn.
This was processed using the apparatus shown in FIG. The processing conditions were as follows. False twisting yarn speed: 430 m/min Frictional false twisting element surface speed: 1200 m/min False twisting direction: S Heater temperature: 200°C The resulting processed yarn utilizes the characteristics of hemp itself, and has less unevenness than 100% hemp yarn. A small number of uniform yarns can be obtained, and troubles during knitting, which were considered difficult in the past, have been significantly reduced. In addition, although simultaneous false twisting with hemp yarn has not been possible with conventional pin type spindle false twisting, the method of the present invention has made it possible to do so at high speeds.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the structure of a spindle type twister, FIG. 2 is an explanatory diagram showing an embodiment of the method of the present invention, and FIG. 3 is a perspective view showing an example of a friction type twister. 1... Pin, 2... Yarn, 3... Spun yarn, 4...
...synthetic filament yarn, 5...supply roller,
6... Delivery roller, 7... Heater, 8... Friction type twister.

Claims (1)

[Claims] 1 A thermoplastic synthetic filament yarn and a spun yarn made of natural fibers are aligned and twisted, and then heat treated while being continuously given false twist to form a bulky yarn. It is a friction-type false twisting method in which twisting is performed at 100 to 300 T/m in the same direction as the ground twist of the yarn, and the false twisting is brought into contact with the periphery of a rotating disk, and the twist is the same as the ground twist of the spun yarn. A method for producing a bulky composite yarn characterized by false twisting in opposite directions.