JPS6142009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite crimped yarn, and more particularly to a composite crimped yarn comprising thermoplastic long fibers and spun yarn, and a method for manufacturing the same.

Composite crimped yarns using various yarns have conventionally existed. However, conventionally, it has been difficult to false-twist thermoplastic long fibers such as polyester and spun yarn in a consistent manner, so a composite crimped yarn made of both has not been put to practical use. In other words, in the conventional spindle type, external type, or internal type friction false twisting type, which are generally known as conventional false twisting devices, the tension on the untwisting side is greater than the tension on the twisting side, resulting in many yarn breaks, and There was a problem in which the joined yarns were separated into pieces due to the tension on the untwisting side.

The present invention is composed of two endless belts that intersect and are in contact with each other with the belt surfaces pressed against each other at the intersecting points, and the yarn is passed through the intersecting surfaces of both running belts, giving the yarn a twist and a feeding action at the same time. By using a false twisting device to make the tension on the untwisting side smaller than the tension on the twisting side, we can create a composite crimped yarn with a unique texture that uses thermoplastic long fibers as the core yarn and spun yarn as the leno yarn. This is the realization of a method for manufacturing.

A method for manufacturing a composite crimped yarn using long fibers as a core yarn and spun yarn as a leno yarn will be described below with reference to FIG.

In FIG. 1, a yarn 3 made of thermoplastic long fibers is fed out from a bobbin 1 by a supply roller 2,
It passes through a heater 4 and is sent to a false twisting device 5 consisting of two endless belts. A roller 6 is provided downstream of the supply roller 2, and a yarn 8 made of spun yarn from the second bobbin 7 is guided so as to coincide with the yarn 3 sent from upstream. The yarn 8 is then sent together with the yarn 3 through a heater 4 and a false twisting device 5, and the formed composite crimped yarn 9 is wound up by a take-up roller 11 via a delivery roller 10. In this case, the tension applied to the yarn on the output side of the false twisting device 4, that is, on the untwisting side, is selected to be smaller than the tension applied to the yarn on the input side, ie, the twisting side, of the device 5.

In this way, by supplying the second yarn 8 from the downstream side of the first yarn 3, the second yarn 8 becomes a composite crimped yarn in a form that is entangled around the first yarn 3 as a core yarn. 9 is formed. In other words, according to this method, the first yarn 3 is already twisted to some extent before it joins the second yarn 8, so the second yarn 8 in particular is easily twisted into the first yarn 3. It is something that can become entwined with its surroundings.

Note that the second supply roller 6 is preferably a twist prevention roller. Further, a delivery roller and a secondary heater may be arranged on the exit side of the false twisting device 5.

FIG. 2 shows a sketch of a microscopic photograph of a composite crimped yarn according to the present invention. That is, polyester SD75de/36fil is used as the first yarn 3, and the second yarn 8 is made of polyester SD75de/36fil.
A spun yarn consisting of No. 42 single yarn (EC42/1) of 50% polyester and 50% cotton was used as the yarn, and was produced by the method shown in FIG. As can be seen from FIG. 2, the obtained composite crimped yarn 9 has yarns 8 of spun yarns intertwined well on the outside of yarns 3 made of long fibers in a mixed form of S twist and Z twist, and , fluff 13 of thread 8
Since they protrude outward, it is possible to obtain a unique texture as if the entire composite crimped yarn 9 were a spun yarn, and also to obtain a composite processed yarn having hygroscopicity depending on the type of short fibers.

In this way, the composite crimped yarn according to the present invention not only has a unique texture, but also has the necessary strength depending on the application by selecting the long fibers that serve as the core yarn, making it a new type of crimped yarn. It has the excellent property of being able to be used as a thread in many ways.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for manufacturing a composite crimped yarn according to the present invention. FIG. 2 is a sketch of a photomicrograph of a composite crimped yarn produced by the method according to the invention. 3... Yarn consisting of thermoplastic long fibers, 5... False twisting device, 8... Yarn consisting of spun yarn, 9... Composite crimped yarn, 13... Fluff.

Claims (1)

[Claims] 1. Feeding thermoplastic long fibers from the first bobbin,
The spun yarn is provided from the second bobbin and merged with the thermoplastic long fiber downstream, and the merged yarn is sent to a false twisting device via a heater, and the false twisting device intersects and the belt surface at the intersection. It consists of two endless belts that are pressed together and in contact with each other,
It is a false twisting device of the type that passes the yarn through the intersecting planes of both running belts and applies a feeding action to the yarn at the same time as twisting the yarn, and the tension applied to the yarn on the untwisting side is smaller than the tension on the twisting side. A method for producing a composite crimped yarn having a structure in which the thermoplastic long fiber is used as a core yarn and the spun yarn is entangled on the outside.