JPH055929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for piling yarns, and particularly to a method for preventing splitting of spliced yarns.

[Prior Art] Conventionally, in order to combine two or more yarns in a fiber bundle, it has been common practice to guide each yarn using a V-shaped or U-shaped grooved guide and then combine the yarns. It was hot.

[Problems to be Solved by the Invention] However, in such conventional yarn doubling methods, each yarn has a twist during doubling and becomes rope-like, which tends to cause yarn breakage after doubling. However, it was not possible to obtain yarns in a stable intertwined state. Such spliced yarns with many cracks can significantly impede the operability in the next process, or if the spliced yarns are made of carbon fiber, for example, when processed into a prepreg sheet, a uniform sheet may not be obtained, resulting in quality defects. There were problems such as.

The object of the present invention is to solve the problems of the prior art, particularly to prevent splitting of doubled yarns and to obtain yarns in a continuously stable intertwined state.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for doubling a plurality of yarns using a guide, which includes:
A plurality of yarns are spread out on a first guide, aligned in the same direction and overlapped, and the overlapping yarns are guided onto a second guide, and the second guide guides the first and second guides. 45～
To provide a method for doubling yarns, which is characterized in that the yarns are intertwined with each other by twisting in a range of 90°.

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a schematic plan view showing an example of the yarn doubling means of the present invention, and FIG. 2 is a schematic side view of FIG. 1.

In the figure, 1 and 1' are guides for the purpose of spreading and overlapping the yarns, 2 is a guide for twisting the doubling yarns, 3 is a common base for fixing the guides 1, 1', and 2; 4 and 4' indicate the yarn before doubling, and 5 indicates the yarn after doubling.

That is, the yarns 4 and 4' to be combined are first brought into contact with the guides 1 and 1' in a perpendicular direction to spread each yarn into a tape shape, and then on the guide 1' (first guide), Align the directions and overlap. This state can be called preliminary doubling, and the yarns are almost layered, although there is some intertwining. Next, the superimposed yarn is twisted between guide 1' and guide 2 by guide 2 (second guide). Due to this twist, the overlapping yarns move in the direction of convergence on the guide 2, increasing the entanglement between the yarns, completing the yarn doubling, and greatly reducing the yarn breakage of the yarn 5 after the yarn doubling. can be reduced to

In this case, the relationship between the guide 1 and the guide 1' may be such that the threads can be placed on top of each other, and the distance between the guides in the direction of thread travel may be set as appropriate.

Also, the twist angle of guide 2 with respect to guide 1 (or 1') is usually 45° to 90°, preferably 60° to
Set to 90°. If the twist angle is less than 45°, the yarn breakage rate tends to increase, and if it exceeds 90°, the doubled yarn will become rope-like, and the yarn will spread evenly, especially if it will be processed into a sheet in the next process. Problems such as difficulty may occur more easily.

As an example of the guide used in the present invention, a known guide or guide roller may be used, but a fixed cylindrical guide, a shell rotating guide roller with a built-in bearing, etc. are particularly preferable.

In addition, in the present invention, the above-mentioned guide 1,
It is not at all prohibited to use guides other than 1' and 2 for stabilizing the thread path.

[Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

In this example, the yarn breakage rate was measured by the following method.

The yarn after doubling was cut in 1m increments in the length direction and visually inspected while placed on the paper surface, and those that were not doubled with a distance of 0.2m or more were classified as "thread cracked". . 100 samples were taken using this method.
The yarn breakage rate (%) was calculated.

Example 1 Roller guides with an outer diameter of 20 mmφ were used as the guides 1 and 1', and the distance between the guides was about 50 mm in the yarn running direction. In addition, the yarns were overlapped by about 2 mm in the direction of overlapping. A roller guide with an outer diameter of 20 mmφ is used as guide 2, and the distance from guide 1' is approximately
It was set to 50mm. At this time, guide 1 (or 1')
The twist angle of guide 2 was 90°.

Using the above doubling device, two multifilament yarns (1.5 denier, 2000 yarns) are doubled,
A 6000 denier doubled yarn was produced. The yarn breakage rate of the doubled yarn was approximately 5%.

Incidentally, the yarn breakage rate of yarns spun by conventional V-shaped or U-shaped grooved guides was about 90%.

Example 2 In Example 1, when the twist angle of guide 2 with respect to guide 1 (or 1') was set to 60°,
The thread breakage rate was approximately 10%.

Example 3 In Example 1, when the twist angle of guide 2 with respect to guide 1 (or 1') was set to 45°,
The thread breakage rate was approximately 30%.

Comparative Example 1 In Example 1, when the yarn was doubled without using the guide 2, the yarn breakage rate was about 75%.

[Effects of the invention] According to the yarn doubling method of the present invention, the entanglement of the doubling yarns is significantly improved compared to the conventional yarn doubling method using a V-shaped or U-shaped grooved guide, etc. It is possible to obtain a yarn in a stable intertwined state.

It is possible to significantly reduce the yarn breakage rate of the spun yarns, and is particularly effective when multiple yarns are spliced.

and other remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an example of the yarn doubling means of the present invention, and FIG. 2 is a schematic side view of FIG. 1. 1, 1′; Guide for the purpose of spreading and overlapping the yarn;
2; Guide for twisting the plied yarn; 3;
A common base for fixing guides 1, 1' and 2; 4, 4'; yarn before doubling; 5: yarn after doubling;

Claims (1)

[Claims] 1. In a method of piling multiple yarns using a guide, multiple yarns are spread out on a first guide, overlapped with the same direction, and the overlapped yarn is placed on a second guide. A yarn combination method characterized in that the second guide applies a twist in the range of 45 to 90 degrees to the overlapping yarns between the first and second guides to intertwine the yarns. Yarn method.