JPS5915097B2 - Method for manufacturing glass fiber bundles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing glass fiber bundles such as glass fiber strands, rovings, or cut products thereof.

A glass fiber bundle is produced by pulling out a large number of glass fibers from a bushing, adding a sizing agent to the fibers, and sifting them together.

By passing a large number of glass fibers to which a sizing agent has been applied through grooves provided in the sizing member, the glass fibers are bundled in parallel and in close contact with each other.

Glass fibers are usually extremely thin with a diameter of about 10 μm, and because they are pulled out at a high speed of about 500 m/min or more and run through the grooves, they can be damaged by friction with the focusing member while they are running. easy.

For this reason, graphite, which has good lubricity, has been used as a focusing member, but it has been found that the use of a focusing member made of graphite has the following drawbacks.

That is, when a graphite focusing member is used, it is possible to obtain good results without damaging the glass fibers while the member is new, but as the member is used, it not only becomes easier to damage the glass fiber bundles, but also causes damage to the glass fiber bundles. This causes stains on the fiber bundle or uneven adhesion of the sizing agent, making it difficult to obtain a good glass fiber bundle.

In order to solve these difficulties, the inventor of the present invention, after repeated studies, decided to pass glass fibers to which a sizing agent has been added through a phenolic resin sizing member, and to perform sizing during this time. The present invention has been proposed based on the discovery that not only the above-mentioned drawbacks can be eliminated, but also very favorable results can be obtained, such as the usable life being longer than when using a graphite focusing member.

Comparing the hardness of phenolic resin and that of graphite, graphite has a Shore hardness of 45, and phenolic resin has a hardness of about 10 O. Phenol resin is softer, and graphite has better lubricity.

There is also no significant difference between graphite and phenolic resin in terms of adhesive strength with the sizing agent.

Judging from these properties alone, it seems that using a graphite focusing member is better in terms of durability and scratch resistance, but when using a phenolic resin focusing member, , it is possible to obtain remarkable effects as described below.

Although the effect of the present invention is not fully clear, it is thought to be approximately as follows.

The focusing member is abraded by being slid by the glass fiber bundle traveling at high speed, and a large number of scratches extending approximately in the running direction of the glass fiber bundle are generated on the surface.

The directions of these scratches are not completely parallel, but often intersect with each other at a slight angle, or overlap each other.

As a result of detailed observation of the wall surface that constitutes these scratches (dents), it was found that the graphite focusing member had many acute angles, whereas the phenol resin focusing member had almost no acute angles. It was found that the wall surface was composed of a rounded curved surface.

If a graphite focusing member is used, the glass fiber bundle will be damaged by the sharp angle mentioned above, but with a phenol resin focusing member, the wall surface is rounded, so the glass fiber bundle slides over the member at high speed. It seems that no scratches will occur even if the product is moved.

Furthermore, when observing the focusing member under magnification, the graphite member has a large number of micropores on its surface, especially the uneven surface, but the phenol resin focusing member has almost no such small pores. Turns out it doesn't exist.

The sizing agent enters into these micropores, and due to the anchoring effect, the sizing agent adheres and accumulates to form small lumps, and this anti-adhesive sizing agent peels off and adheres to the glass fiber bundle, which is one of the causes of uneven adhesion. This is one of the factors, and it is thought that phenol resin members with fewer small pores are less likely to experience uneven adhesion.

It is not entirely clear why the usable life of the phenolic resin focusing member is shorter, but as seen in the examples below, the usable life can be greatly improved by using the phenolic resin member. You can force it.

In the present invention, the phenolic resin focusing member is a liquid phenolic resin for lamination (for example, LP manufactured by Hitachi Chemical Co., Ltd.).
A reinforcing material such as paper or cloth is impregnated with rough phenol resin and then dried to produce resin-impregnated paper.Next, the phenol resin-impregnated cloth is cut to a predetermined size, stacked on top of each other, and heated under pressure. Using a commercially available phenolic resin laminate produced by curing, a focusing member can be manufactured by machining and used suitably.

(For example, see page 34 of "Phenol Resin Guidebook," published by Imori Publishing Co., Ltd., October 1, 1962, by the Polymer Machinery and Materials Committee of the Society of Polymer Science and Technology.) On the other hand, the graphite focusing member is an MC system manufactured by Mechanical Carbon Co., Ltd. Alternatively, it is preferable to use A-based graphite machined.

Next, the present invention will be explained in more detail.

In Fig. 1, reference numeral 1 denotes a focusing member made of phenolic resin of the present invention, and a shaft hole 2 in the center for attaching the member to a predetermined position.
It has a cylindrical shape, and a V-shaped groove 4 is provided on the circumferential side surface 3 of the V-shaped groove 4 running along the axis.

Note that the Bakelite resin may also be reinforced with paper, cloth, or the like.

The sizing agent member is tightened with a nut (not shown) using a bolt (not shown) passing through its axis so that its axis is substantially perpendicular to the traveling direction of the glass fiber bundle, as shown in FIG. It is routed to a suitable support member.

A large number of glass fibers 6 pulled out from the bushing 5 and given a sizing agent are guided into the V-shaped groove and bundled into a strand 7.
is formed and sent to a winding device, a cutting device (not shown), etc.

Note that if the focusing member is always fixed at a fixed position, uneven wear will occur in the groove, so it is desirable to occasionally loosen the nut and rotate the focusing member.

When using the focusing member of the present invention configured as described above,
As seen in the examples below, it is possible to obtain a glass fiber bundle with good quality without scratches or uneven adhesion resistance.

Example: A starch-based sizing agent was applied to glass fibers with a diameter of 10μ pulled out from a bushing, and about 500 fibers were bundled using a phenol resin binding member as shown in the figure, and the fibers were collected at a speed of 500 m/mi.
It was wound up while traversing at a high speed of n or higher.

The following table shows a comparison with the case using a graphite focusing member under the same conditions.

[Brief explanation of the drawing]

FIG. 1 is a front view of a phenol resin convergence member, and FIG. 2 is a front view of a glass fiber bundle manufacturing apparatus. 1 is a focusing member made of phenol resin, and 4 is a V-shaped groove.

Claims (1)

[Claims] 1. Pull out a large number of glass fibers, add a sizing agent and bundle them,
A method for producing a glass fiber bundle, which comprises passing the glass fibers through a groove provided in a phenol resin focusing member, and collecting the glass fiber bundles during this time. Method.