JPS592089Y2 - Glass fiber bundle drawing device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a glass fiber bundle drawing device used for manufacturing continuous strand mats, etc.

Continuous strand mats have a high tensile strength and are widely used for reinforcing FRP because they do not break even when deep drawn using a press molding method.

Continuous strand mats are made by applying a sizing agent to glass fibers pulled out of a bushing with many small holes, and then brought into contact with a pulling wheel that rotates at high speed. However, unlike this conventional method, the present inventor attempted to manufacture this continuous strand mat using a cake as a starting material. Special application 1977-
It was proposed as No. 79693 (Japanese Unexamined Patent Publication No. 56-4759).

A cake is made by applying a sizing agent to molten glass pulled out from a bushing with many small holes, condensing it, and winding it up on a paper tube fitted to a mandrel that rotates at high speed. , has been widely used in the production of chopped strand mats, twisted yarn, etc., and the strands are pulled out from the cake using a pair of feeding rolls,
Two methods are widely practiced: and extraction by air flow.

However, the following drawbacks exist when these methods are used for continuous strand mat production.

In other words, it is possible to obtain a constant drawing speed by drawing the strands while pinching them between a pair of feed rolls, but in the production of continuous strand mats, the drawn strands are Since the strand is not directly connected to the manufacturing equipment, and therefore the drawn strand is not mechanically pulled, the strand drawn out from the feed roll is likely to wind around the roll, and the strand may become tangled during drawing. There is a risk that a large tension will be applied to the strand and a cutting accident will occur, so it was necessary to provide some kind of detection means to prevent the thread from becoming entangled or breaking.

On the other hand, in a method in which the strand is introduced into a cylindrical draw-out hole, air is discharged at high speed from a compressed air discharge hole provided in the draw-out hole, and the strand is drawn out using the air flow, there is no risk of the thread being entangled or breaking. Although it has the advantage that the strands are opened sufficiently, it is not possible to obtain a constant drawing speed because the force required for drawing changes depending on the application state of the sizing agent. It was not possible to produce a pure strand mat.

This invention eliminates the above-mentioned drawbacks of conventional glass fiber bundle drawing devices, and allows the strand to be drawn out reliably at a constant speed, without the fear of thread breakage or thread entrainment, and allows the strand to be drawn out sufficiently. It is an object of the present invention to provide a novel glass fiber bundle drawing device capable of opening the fibers.

Hereinafter, the structure of the invention will be explained in detail based on an embodiment of the invention shown in the drawings.

1 is a drive roll, and 2 is a driven roll, which are mounted opposite to each other in a housing 3 and have the same diameter, so that the driven roll 2 rotates when the drive roll 1 rotates.

A strand introduction hole 4 whose diameter tapers outward is provided on the housing wall surface opposite to the feeding direction of the driving roll 1 and the driven roll 2 on a tangent to the contact portion of the rolls. Further, on the feeding direction side of the driving roll 1 and the driven roll 2, there are provided strand discharge holes 5 which have a gently tapered shape and whose diameter increases toward the outside.

Furthermore, a plurality of compressed air discharge holes 6, 6 are opened in this strand discharge hole 5 and are inclined toward the feeding direction, so that compressed air can be fed through an air pipe 7.7.

In this embodiment, two compressed air discharge holes 6,
6 are provided facing each other and staggered in the axial direction of the strand discharge holes, and compressed air is discharged at a pressure of approximately 2 kg/cm2, but the compressed air discharge holes 6
The number of compressed air discharge holes and their mounting positions are not necessarily limited to those in this embodiment, and one or three or more compressed air discharge holes may be provided.

Further, in this embodiment, the diameter of the driving roll 1 and the driven roll 2 is 3Qmm, and the rotation speed thereof is 6000 RPM.

Note that 8 in the figure is a strand.

This device has the above-mentioned configuration, and the strand 8 introduced into the housing 3 through the strand introduction hole 4 is rotated by the drive roll 1 and the driven roll 2 and the arrow A in the strand discharge hole 5. The fibers are drawn out and opened by the directional air flow and discharged.

In this embodiment, the number of rotations of the drive roll 1 is 6.
000 RPM, the feed speed is 500 m/min, the flow rate of the air flow in the direction of arrow A is 600 m/min, the strand is pulled out at 500 m/min, and the strand is pulled out at 10 m/min.
The strands fall continuously onto a moving conveyor (not shown) and are deposited in a non-directional loop to form a continuous strand mat.

Note that a continuous strand mat may be manufactured by depositing the strands drawn out according to the present invention on a continuous strand mat manufactured by a conventional method using a print wheel.

This device has the above-mentioned structure and function, and after drawing with the driving roll 1 and the driven roll 2, the drawing is performed using an air flow faster than the feed roll, so the drawing speed is accurate depending on the number of rotations of the rolls. The strand can be pulled out at a constant speed, and since it is pulled out again by the air flow after being pulled out by the roll, there is no risk of the strand winding around the roll, and the air is pulled out at a constant speed. The strands are appropriately dispersed by the flow and fall onto the conveyor in a fully opened state, which has the excellent effect of producing a continuous strand mat of constant quality.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of a glass fiber bundle drawing device according to this invention. Further, in the figure, 1 indicates a driving roll, 2 indicates a driven roll, 3 indicates a housing, 4 indicates a strand introduction hole, 5 indicates a strand discharge hole, and 6 indicates a compressed air discharge hole.

Claims (1)

[Scope of utility model registration request] A strand introduction hole 4 is provided on the tangent to the contact point of both rolls of a housing 3 containing a pair of opposing driving rolls 1 and a driven roll 2, and a strand discharge hole 5 is provided on the opposite side, and the strand is discharged into the discharge hole 5. A glass fiber bundle drawing device characterized by being provided with a compressed air discharge hole 6 for producing airflow to the side.