JPS643968B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for producing a covering yarn, particularly a covering yarn in which a wrapping yarn is wound around an elastic yarn and a splint yarn attached thereto.

[Conventional technology]

Covering yarn is made by winding a wrapping yarn around a yarn that serves as a core yarn, and the wrapping yarn is pulled out from a bobbin that is inserted into a hollow spindle through which the core yarn is inserted. It is wrapped around the core thread immediately after it is pulled out. Therefore, the larger the size of the bobbin for winding thread, the larger the amount of thread to wind, reducing the number of work stops for replacing the bobbin, and increasing efficiency.
If the fineness of the thread to be wound is made small, the length of the thread wound on the same bobbin will be long and it will be possible to withstand a long period of time without replacing the bobbin, but it is not possible to arbitrarily increase the bobbin size and make the thread thinner. In the above, the working efficiency also changes depending on the number of windings per unit length of the winding yarn. That is, the spindle rotation can be increased as the number of windings increases, but the spindle rotational speed is approximately fixed, so in order to increase the number of windings, the speed of the yarn passing through the spindle must be reduced. This reduces work efficiency. Furthermore, depending on the texture of the yarn, woolly textured yarn may be used as the plating yarn or the winding yarn. However, the amount of woolly processed yarn wound around the bobbin is smaller than that after unprocessed yarn. For this reason, the bobbin is replaced at an early stage.

[Problems to be solved by the invention]

The present invention aims to reduce the number of covered yarns by delaying the replacement of the bobbin as much as possible on the spindle that is winding the wrapping yarn to be wound onto the core yarn, and reducing the number of covered yarns to be covered. By increasing the speed, the aim is to improve work efficiency while obtaining a covering yarn that has the same swelling properties as conventional processed yarns.

[Means to solve the problem]

An unheat-treated splint thread is pulled around the elongated elastic yarn to form a core yarn, and an unheat-treated splint yarn with a finer fineness than the core yarn is wound around the core yarn. By applying twisting and untwisting by false twisting while heating at a lower elongation rate than the above-mentioned elongation, surrounding the elastic yarn with a swollen plint, and pressing the swollen plint with a winding thread. Manufacture covering yarn.

[Function] The unheated splint attached to the elongated elastic yarn and the unheated wrapped yarn wound around both cores of the stretched elastic yarn are used between the feed roller and the delivery roller to create a string with a lower elongation than the above elongation. Because false twisting is applied at the same time as heating, the twisted yarn is heated and heat-set, and then untwisted. For this reason, the thread attached to the elastic thread surrounds the elastic thread in a bent and swollen state, and the winding thread also becomes a woolly thread that is wrapped around them. When the winding yarn is wound around the bobbin, since it is unheated yarn, it is wound more than the woolly yarn, and therefore the interval between bobbin replacements is longer. Furthermore, compared to a method in which a pre-woolly spliced yarn is pulled together with an elastic yarn, the number of coverings of the wrapped yarn with respect to the core yarn is smaller than 1000 t/m.

【Example】

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1A, an elastic thread 2 such as a rubber thread or polyurethane elastic thread pulled out from a package 1 and a splint 4 pulled out from a package 3 are aligned and inserted into a hollow spindle 5. At this time, the elastic thread 2 is given an appropriate elongation between rollers 6 and 7, and the splint thread 4 is given an appropriate tension by a tension device 8. A bobbin 9 is supported on the hollow spindle 5, and a winding thread 10 is pulled out from the bobbin 9, and the elastic thread 2 and splint thread 4 are pulled out from the hollow spindle 5 in an aligned manner.
It is wrapped around. When used for socks, etc., generally the elastic thread 2 is a polyurethane elastic thread of 20 d to 40 d, the plating thread 4 is 70 d to 140 d of nylon, and the wrapping thread 10 is 7 d to 40 d.
A thin nylon thread of about 14D is used. Both the splint thread 4 and the wrapping thread 10 are made of unheated nylon. The unheat-treated covering yarn 11 on which the winding yarn 10 has been wound is arranged so that the elastic yarn 2 and the splint yarn 4 are aligned in parallel, and the winding yarn 10 is wound around the unheated covering yarn 11. When the thread 11 passes through the roller 7, the stretched state is released, the elastic thread 2 is contracted, and the splint thread 4 is moved to the tension device 8.
Although tension has been added to the elastic thread 2, the elongation rate is not higher than that of the elastic thread 2, and the elongation is not that great. The wrapping thread 10 is tightened. The covering yarn 11 wound into the package cage 12 is then subjected to wooly processing. As shown in FIG. 1B, the yarn pulled out from the package 12 is transferred to the feed roller 13.
The false twisting spindle 1 is heated with a heater 15 under a slight elongation between the
Add false twist in step 6. As an example of the above treatment, in the case of polyurethane 20d nylon splicing thread 70d, the false twist spindle rotation is 375,000 times/min, the number of false twists is 3286/US (S
or Z), heater temperature 180℃, overfeed rate -
It is 3%. During the above-mentioned false twisting and untwisting heat treatment, the splint yarn 4 that was bent around and surrounded the elastic yarn 2 was sufficiently transferred with heat and twisted, and then sent out from the delivery roller 14, and the unstretched covering yarn 17 became an elastic yarn. 2
The woolly splint 4 bends and bulges out around the periphery of the cheese 18, being held down in places by the winding thread 10 and wound around the cheese 18.

【effect】

In the method of the present invention, a yarn, such as a so-called raw nylon yarn, which has not undergone a heat treatment step is arranged as a splicing yarn on an elastic yarn, covered with a similar unheat-treated yarn, and heat-set and untwisted in a false twisting region. Because of this, the plint surrounds the elastic yarn in a swollen state, and the wrapping yarn is also entwined with it by heat fixation, so the covering number of the wrapping yarn is sufficient at 1000t/M or less, and the number of covering can be reduced. Therefore, the yarn speed during winding of the wrapped yarn can be increased, and the efficiency during covering can be increased. In addition, since the thickness of the thread to be wound can be reduced to less than half that of the conventional method, it is possible to wind more than twice the length of the covering thread onto the bobbin attached to the hollow spindle, making it possible to replace the bobbin. This enables the number of times to be halved, allowing continuous operation for long periods of time. Furthermore, by changing the rotation ratio of the feed roller and delivery roller, the texture and bulkiness of the yarn can be changed depending on the purpose.

[Brief explanation of drawings]

Fig. 1A is a schematic diagram of a device for winding the wrapping yarn around the core yarn, Fig. 1B is a schematic diagram of a heating false twisting device, and Fig. 2 is a schematic diagram of the device for winding the wrapping yarn around the core yarn. FIG. 3 is a front view of the covering yarn according to the method of the present invention. 2... Elastic thread, 4... Plating thread, 10... Winding thread, 11... Unheated covering yarn, 13
...Feed roller, 14...Delivery roller,
17...Covering yarn.

Claims (1)

[Claims] 1 A splint made of a synthetic fiber thread before heat setting is arranged around the stretched elastic thread to form a core thread, and around it, a wrapping thread made of a synthetic fiber thread before heat set with a fineness relative to the core thread is arranged. A method for producing a covering yarn, which comprises winding the yarn, then twisting the yarn with an elongation smaller than the elongation between a feed roller and a delivery roller, heat-setting it, and then untwisting it.