JPS5838312B2 - Multi-strand resin extrusion molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extrusion molding apparatus for resin extrusion material in which a plurality of strands are embedded in arbitrary positions.

Various extrusion molding devices are known that embed wires or strands in resin, such as coated electric wires, but it is difficult to embed a plurality of wires in arbitrary positions.

The present invention solves this problem by a simple means of providing a guide near the outlet of the nozzle of the die.

That is, the multi-strand resin extrusion device of the present invention comprises a molten resin supply device and a die forming a space for receiving the molten resin, and the die has a plurality of lines L in the space and a plurality of strands for supplying the strands. A strand guide having a guide hole and a nozzle having a spouting outlet,
A spacer guide having a penetrating guide hole that serves as a guide for the wire or strand is provided inside the nozzle at or near the nozzle, and a plurality of wires or strands are sent to the nozzle through the guide hole of the spacer guide. It is characterized by this.

In the device of the present invention, the strands are ultimately guided by a simple spacer guide located near the outlet of the nozzle, which allows the strands to be implanted in more precise positions.

Furthermore, since a conventional extrusion device is only provided with a simple spacer guide, the device is simple.

The spacer guide has a guide hole for guiding the strand.

The strand is guided by the hole wall of this guide hole and fed to the desired position at the opening.

When the strand is embedded inside the extruded material, it is preferable to provide a space or a through hole through which the resin passes between the guide hole for guiding the strand of the spacer guide and the inner wall surface of the die that holds the spacer guide.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in further detail below, along with a description of an apparatus that is an embodiment of the present invention, which was manufactured for producing a fiber-reinforced thermoplastic resin raw material.

There are hundreds of methods for producing fiber-reinforced thermoplastic resins.
A strand made of several thousand filaments is made into a length of 5
A commonly used method is to melt and knead chopped strands cut into small pieces and resin pellets using an extruder, and then form them into pellets.

One of the drawbacks of this method is that the fibers are damaged at °C during the melting and kneading process by the extruder, and the length of the fibers dispersed in the pellets becomes short, which makes the strength of molded products using this short. This is a weak point.

To improve this drawback, there is a method (referred to as a coated wire manufacturing method) in which a continuous strand is coated with molten resin, cut into appropriate lengths, for example, about 5 mm, and pelletized.

Molded products using beresoto manufactured by this coated wire manufacturing method have good strength because the fibers are long.

This coated wire manufacturing method includes a strand accumulation shelf for accumulating a large number of strand-shaped fibers, an extrusion molding machine having a die for coating the strands with molten resin, a cooling device for cooling the coated resin-coated strands, It consists of a pulling machine for taking the resin-coated strands and a cutting machine for pelletizing them.

This embodiment relates to an apparatus for coating a strand with molten resin.

A cross section of the die portion of the device of this embodiment is shown in FIG.

This device is fixed to a normal extrusion molding device 1 (only the molten resin ridge portion is shown in the figure) and the molten resin ridge portion with bolts 11,
It consists of a die 2 having a nozzle 21 and a strand guide 22, and a spacer guide 3 fitted into an inner wall surface constituting the nozzle 21.

The die 2 has a space 28 in its center that receives the molten resin.
has.

The nozzle 21 is formed in the space 23 in the shape of a load, and the spacer guide 3 is fitted and fixed into a stepped portion provided at the inclined portion thereof.

As shown in FIG. 2, the spacer guide 3 has a guide hole 31 in its center, and four holes 32 through which resin passes around its periphery.

The strand guide 22 consists of four thin through holes provided in the wall opposite to the nozzle 21.

The center axis of the circle passing through the centers of these four through holes is nozzle 2.
The diameter of the circle that is equal to the central axis of the spacer guide 1 and that passes through the centers of the four through holes is larger than the diameter of the guide hole 31 of the spacer guide 3.

Each of the four s1 lands passes through the four thin through holes of the strand guide 220, further passes through the guide hole 31 of the spacer guide 3, and finally exits from the nozzle 21.

On the other hand, the molten resin is transferred from the extrusion molding device 1 to the space 23 of the die 2.
It passes through the guide hole 31 of the spacer guide 3 and the four peripheral holes 32, and is continuously extruded to the outside from the nozzle 21, where it is cooled and formed into a rod shape.

As a result, the four strands are completely separated and embedded in the resin, as shown in the molded cross section in FIG.

In addition, by applying a weak tension to the strand when forming it, the strand comes into contact with the inner wall surface that forms the guide hole 31 of the spacer guide 3, and the position of the sl/land is determined there.

In this invention, since the spacer guide is provided at or near the nozzle, there is little possibility that the strand will be misaligned after the position is determined by the spacer guide.

This allows the strands to be embedded in precise positions.

Further, since a space or a through hole through which the resin passes is provided around the guide hole of the spacer guide, the resin is supplied to the entire circumference of the strand, and the strand can be completely embedded in the resin.

Using the apparatus of this example, a resin rod in which four glass fiber strands were embedded in nylon 66 was shaped.

Certain molding conditions were a molten resin temperature of 280° C., an ejection rate of 1001/min, and a molded article take-up speed of 15 m/min.

The strand is a convergence of 2000 monofilaments with a glass fiber diameter of 13 μm, and the glass fiber content in the molded product is 30% by weight (hereinafter % indicates weight%).

The rod-shaped resin obtained had four strands completely embedded in the resin at regular intervals as shown in the cross section of FIG.

Next, this rod-shaped resin was cut into a length of 51nrIL using a cutting machine to produce pellets to be used as a molding raw material.

There were no inconveniences such as strands falling out during cutting.

In addition, even when the strand content was about 70%, the strands were completely separated and a rod-shaped resin embedded in the resin could be obtained, and the strands could be cut without falling out during cutting.

In addition, in a device that does not use the conventional spacer guide 3,
For example, as shown in the cross section of FIG. 4, a rod-shaped resin was obtained in which the strands were offset toward the periphery.

When this rod-shaped resin was cut, there was an inconvenience that the strands would fall out.

In this embodiment, the spacer guide shown in FIG. 2 is used, but spacer guides having various shapes as shown in FIGS. 5 and 6 can be used.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a multi-strand resin extrusion device according to an embodiment of the present invention, FIG. 2 is a plan view of a spacer guide used in the embodiment, and FIG. FIG. 4 is a cross-sectional view of a rod-shaped resin molded using a conventional apparatus, and FIGS. 5 and 6 are plan views showing other examples of spacer guides. In the figure, reference numeral 1 indicates a resin extrusion molding device, 2 a die, 21 a nozzle, 22 a strand guide, and 3 a spacer guide.

Claims (1)

[Scope of Claims] 1. Consists of a molten resin supply device and a die forming a space for receiving the molten resin, and the die includes a strand guide having a plurality of guide holes for supplying a plurality of wires or strands into the space, and a die. a nozzle having an outlet;
A spacer guide having a penetrating guide hole that serves as a guide for wires or strands is provided inside the nozzle at or near the nozzle, and a plurality of wires or strands are sent to the nozzle through the guide hole of the spacer guide. Features: Multi-strand resin extrusion device. 2. The plurality of spacer guides according to claim 1, wherein the spacer guide has a guide hole passing through the center thereof to serve as a guide for the strand, and a hole or space for passing the molten resin is formed in the peripheral part surrounding the guide hole. Strand-containing resin extrusion molding equipment.