JPH02145830A - Opening method of fiber bundle - Google Patents

Abstract

PURPOSE:To efficiently open even thick fiber bundle, etc., without generation of fuzz by feeding yarn onto expander roll comprising a cylindrical body covered with elastomer and parallelizing on a sheet by expanding force in axial direction arising from running of the roll. CONSTITUTION:Fiber bundle 9 of carbon fiber or glass fiber, etc., is fed and brought into contact with an expander roll installing an inclined frame 1 for expanding outer peripheral rubber, a fixed frame 2 for supporting of bearing, screws 4 and 5 for expanding the outer peripheral rubber and a handle 6 and rolling with nipping the outer peripheral rubber 7 in side plate 3, then opened by expansion of the rolling outer peripheral rubber 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the widening or opening of yarns, etc., and is capable of opening yarns, etc. aligned in the - direction to a sufficiently thin layer without generating fluff, etc. The present invention relates to a method for opening yarn, etc., which allows easy production of high-quality sheets.

[Conventional technology]

Currently, aligned prepreg sheets made of carbon fiber, glass fiber, etc. are used for various purposes. This prepreg sheet is manufactured by opening yarn or the like thinly, aligning it onto a sheet, impregnating it with resin, and curing it in the second half. However, when producing a prepreg sheet in this manner, there is a problem in opening the yarns, making it difficult to produce a high-quality sheet, and an improvement is desired.

In other words, a high-quality prepreg sheet is, for example, 10
The sheet is long and thin, for example, 0.1 m or more, and is spread and aligned to a thickness of about 0.1 m, and each filament of this sheet is aligned without meandering, and there are no cracks. In some cases, it is necessary to have a low resin impregnation rate. However, when opening yarn using the conventional method,
Frictional force, cohesive force, etc. act on each filament, making it difficult to spread the yarn sufficiently thinly, and cracks occur after forming into a sheet, making it difficult to manufacture a high-quality product.

With the diversification of uses and expansion of prepreg usage, the widening and opening technology of the yarn that is its raw material has been attracting attention. One reason for this is the increasing demand for ultra-thin prepreg.

For example, in the past, for fishing rods, it was common to use a unidirectionally aligned carbon fiber prepreg with an ultra-thin glass scrim cloth attached to it to obtain crushing strength, but recently, ultra-thin Instead of the glass scrim cloth, we used an ultra-thin unidirectionally aligned carbon fiber prepreg that was affixed directly to the base material, the same unidirectionally aligned carbon fiber prepreg, to improve crushing strength and reduce the carbon fiber ratio. Products aimed at reducing weight by increasing weight are being developed.

Another reason why yarn widening and opening technologies are attracting attention in prepreg manufacturing is cost reduction. That is, this technique attempts to obtain a prepreg with the same thickness as before by widening and opening a yarn with a larger number of filaments than before. For example, it is said that, although it depends on the manufacturing method, yarns with a small number of filaments are generally more expensive to fire than yarns with a larger number of filaments in the case of carbon fibers. In addition, with yarns with a small number of filaments, even when producing prepregs of the same thickness,
When using yarn with a large number of filaments, more yarn must be handled, which increases the amount of work and increases costs.

As described above, among the prepreg manufacturing technologies, techniques for efficiently widening and opening raw material yarns have become important points.

Various proposals have been made in the past regarding widening and opening techniques for such a line. For example, the yarn is placed on a cylindrical body and spread by running it while applying vibration in the axial direction of the cylindrical body (Japanese Patent Laid-Open No. 56-43435), or the yarn is spread under tension on a reciprocating body or a rotating body. For example, the yarn is struck by force, vibrated in a direction perpendicular to the running direction, and pressed against a substrate having a curved surface to continuously spread the yarn (Japanese Patent Laid-Open No. 61-275438). However, in the former method, the yarn is rubbed against a surface, so if the frequency or amplitude is increased to increase the width and opening effect, it is necessary to order fluff, and even in the latter method, if the pressing force is increased, fluff will be generated. This has led to the problem that a sufficient opening effect has not always been obtained.

[Problem to be solved by the invention]

These conventionally known methods include increasing the vibration frequency and amplitude when widening or opening thick yarns with a large number of filaments or yarns with low tensile strength and shear strength, and methods that increase the force when pressing. The reality is that the generation of fuzz becomes a problem and a sufficient opening effect is not necessarily obtained.

[Means to solve the problem]

The gist of the present invention is to spread or spread the yarn, etc. by the expansion force in the roll axis direction of the expander roll while applying tension to the yarn, etc., on an expander roll having an elastic body on a cylindrical body. It is something to do.

[For production]

FIG. 2 shows the main parts of this device.

After the continuously fed yarn leaves the guide roll, it comes into contact with the elastic body of the expander roll, which has an elastic body on a cylindrical body and whose outer periphery is narrow. Transmits rotational force to the roll. While rotating, the expander roll expands the peripheral elastic body and the yarn contact surface by a tensile force in the roll axis direction corresponding to the inclination angle of both side plates. This expansion width can be changed to any desired expansion width by turning the adjustment handle 6 during expansion of the outer rubber. Also, the elastic body is 180 degrees from the entry side contact surface.
``From the rotated point, a force is applied in the opposite direction toward the inner tank, so the widening and opening functions are limited to the half circumference of the expander roll, as shown in the sectional view taken along line A-A' in Figure 2.

〔Example〕

The present invention will be specifically explained below using examples.

FIG. 1 shows an embodiment of the present invention. Note that this embodiment is an example applied to a carbon fiber prepreg device.

In Fig. 1, reference numeral 11 is a CF creel stand, which uses carbon fibers and fiber bundles (1000-12000) filaments to produce CF creel at running speed (0.5-10 m/m1n) and tension (50-500 g). After passing through the guide roll 12 and being preliminarily opened by the expander roll 14, the fibers are made into a sandwich-like shape with resin coated paper 16 on the upper and lower sides. However, one side of the resin-coated vapor 16 does not need to be resin-coated.

Next, after being rolled with a pressure roll 17, the resin-coated paper I6 is peeled off, and the upper surface is laminated again with a polyethylene film 21 and the lower surface with a release paper 22 in the form of a sandwich. Finally, it is wound up by a prepreg winder 23 to become a prepreg roll product.

〔Effect of the invention〕

As explained above, especially in the continuous production of ultra-thin prepreg, the current problem is the generation of filament fuzz, and in order to eliminate this, it is necessary to pre-open the filament by using the expander roll of the present invention. It is essential to provide processing equipment to the prepreg production equipment.

Therefore, by using the preliminary opening method using expander rolls of the present invention, it is possible to widen a wide range of thick fiber bundles with a large number of filaments and those with low tensile strength and shear strength, which were difficult to open in the past, thereby increasing production efficiency. This makes it possible to significantly reduce manufacturing costs by improving prepreg quality.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an embodiment of the present invention. Figure 1 is an overall schematic diagram of a fiber opening device for opening carbon fibers, and Figure 2 is a preliminary opening treatment. FIG. 1 is a schematic diagram specifically showing an expander roll of the present invention. 1: Peripheral rubber expansion inclined frame 2: Bearing support fixed frame 7: Peripheral rubber 8: Bearing 9: Fiber bundle

Claims (1)

[Claims] Spreading of yarn, etc., characterized in that continuously fed yarn, etc. is run on an expander roll having an elastic body on a cylindrical body, and the yarn, etc. is opened by the expansion force in the roll axis direction. Method.