JPS6142010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite crimped yarn, in particular a composite crimped yarn composed of thick and thin single yarns made of thermoplastic long fibers and having a spun-like texture. The present invention relates to a method of manufacturing a composite crimped yarn.

Conventionally, various methods have been proposed for producing yarn having a texture similar to that of spun yarn using long fibers. However, in the 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. There were many problems with thread breakage due to entanglement of the threads, and when forming composite threads, the entangled threads separated from each other 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. Using a false twisting device, the tension applied to the yarn on the untwisting side is made smaller than the tension on the twisting side, and the yarn made of relatively thick single yarn thermoplastic long fibers is used as the core yarn and relatively thin single yarn. This product provides a composite crimped yarn composed of yarn made of long thermoplastic fibers as a leno yarn, and in particular, the thin single yarns that make up the long fibers of the leno yarn form a loop, creating a texture similar to that of a spun yarn. The present invention provides a method for producing a composite crimped yarn having a composite crimped yarn.

Hereinafter, a method for manufacturing a composite crimped yarn according to the present invention will be explained with reference to FIG.

A yarn 3 made of relatively thick single thermoplastic long fibers is fed from a bobbin 1 by a supply roller 2, and sent through a heater 4 to a false twisting device 5 made of two endless belts. A second supply roller 6 is provided downstream of the supply roller 2, and from a second bobbin 7, a yarn 8 made of a relatively thin single thermoplastic long fiber is aligned with the yarn 3 sent from upstream. Send it out like this. Then, the yarn 8 is sent together with the yarn 3 through a heater 4 and a false twisting device 5, and the formed composite yarn 9 passes through a delivery roller 10 and a winding roller 1.
It is rolled up to 1. In this case, the tension applied to the yarn on the exit side, ie, the untwisting side, of the false twisting device 5 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 somewhat twisted before joining the second yarn 8, so that the second yarn 8
are particularly easily entangled around the first thread 3.

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 micrograph of a composite crimped yarn according to the present invention, in which polyester SD75de/15fil is used as the first yarn 3 and polyester SD75de/72fil is used as the second yarn 8.
This is a composite crimped yarn 9 manufactured by the method shown in FIG. As can be seen from Fig. 2, the thick single yarn 3 becomes the core yarn, and the thin single yarn 8 is placed on the outside of the core yarn.
It is wrapped in a mixture of twist and Z twist, and is well intertwined. Moreover, the thin single yarn of yarn 8 forms a loop 12 in a protruding form, thereby forming a composite crimped yarn 9.
The entire fabric has a unique texture that makes it appear as if it were spun yarn.

In this way, the present invention produces a composite crimped yarn with a unique texture similar to that of spun yarn from single thick and thin filaments, which has the advantage of being usable in many ways as a new type of yarn. It has the following characteristics.

[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 a relatively thick single filament,
5... False twisting device, 8... Yarn consisting of a relatively thin single filament, 9... Composite crimped yarn, 12... Loop.

Claims (1)

[Claims] 1. A single relatively thick thermoplastic long fiber is supplied from a first bobbin, a relatively thin single thermoplastic long fiber is supplied from a second bobbin, and the relatively thick thermoplastic long fiber of the single yarn is supplied from a second bobbin. The long fibers are merged downstream, and the merged yarn is sent to a false twisting device via a heater. It is a false twisting device of the type that passes the yarn through the intersecting plane of both running belts, twists the yarn, and gives a feeding action at the same time. A method for producing a composite crimped yarn having a structure in which relatively thick thermoplastic long fibers of the single yarn are used as core yarn and relatively thin thermoplastic long fibers of the single yarn are entangled on the outside. .