JPH01133711A - Structure of mouthpiece of extrusion molding machine - Google Patents

Abstract

PURPOSE:To contrive simplification of a working process and facilities, by a method wherein a discharge port of a solution is opened and formed on an inner wall surface of an opening part of a coating mouthpiece by corresponding to a desired part to which the solution is applied and a solution feed passage arriving at the discharge port of the solution is formed within the coating mouthpiece. CONSTITUTION:Extrusion molding of glass-run whose section is in about a U-shaped state is performed by making use of a material such as rubber. The tip of a cylinder barrel 1 feeding the material such as the rubber is arranged with, for example, a disklike main mouthpiece 5. Then a coating mouthpiece 6 is arranged similarly on the outside of the same. Then the main mouthpiece 5 and the coating mouthpiece 6 are superposed upon each other closely. A material passage 9 in a form corresponding to a sectional form of the glass-run is formed on the main mouthpiece in a penetrating state. An opening part 12 a little larger than the material passage 9 is formed on the coating mouthpiece 6 in a penetrating state. A discharge port 18 of the solution of the tip of a groovelike solution feed passage 17 corresponding to a desired part to which the solution is applied is opened at an inner wall surface 12a of the opening part 12 of the mouthpiece 6. Then the extrusion molding of the glass-run and coating of a coating solution can be treated at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a die structure for an extrusion molding machine, and more particularly to a die structure that allows coating liquid or paint to be applied to the surface of a molded product simultaneously with extrusion molding.

Conventional technology Long pieces with the same cross-sectional shape, such as automobile weather strips and glass runs, are generally formed by extrusion molding of rubber or synthetic resin, but coating liquid or paint is applied to the surface. There are cases where

As an example, in a glass run having a substantially U-shaped cross section that slidably seals the end surface of an automobile windshield, the bottom surface in contact with the windshield and the inner wall surfaces of both sealing lips are provided with a material to reduce sliding resistance. It is necessary to apply a coating liquid.

Conventionally, in order to apply this coating liquid, the extruded glass run was vulcanized and then the coating liquid was sprayed onto the extruded glass run.

Problems to be Solved by the Invention Therefore, not only is the coating process a separate process, which is very troublesome, but there are also problems in that it requires equipment separate from the extrusion molding machine for the coating process. .

In addition, with this spray application method, it is difficult to apply the minimum amount to the required areas of Grass Run.
Coating liquid is consumed excessively, which increases material costs.

Of course, the problem is not limited to the above-mentioned glass run, and similar problems occur also when a part of the weather strip or the like is painted in the car body color.

Means for Solving the Problems Therefore, the present invention provides a die structure for an extrusion molding machine that allows coating liquid or paint to be applied simultaneously during the extrusion molding stage. That is, the extrusion molding machine nozzle structure according to the present invention includes a main nozzle that is attached to the tip of the extrusion molding machine and has a material passage formed therethrough with a shape corresponding to the desired molded product shape, and a main nozzle that is attached to the tip of the extrusion molding machine. It consists of a coating cap which is attached to the outside in a layered manner, and the coating cap has an opening that is slightly larger than the material passage described in 1. A liquid discharge port is formed in the inner wall surface of the opening, and a liquid supply passage leading to the liquid discharge port is formed inside the coating mouth.

The material plasticized inside the extruder is extruded through the material passage of the main die to form a molded product with a predetermined cross-sectional shape. The molded product extruded from the main nozzle then passes through the opening of the coating nozzle, but
At this time, a liquid, such as a coating liquid or paint, sent out from the liquid discharge port is continuously applied to the surface of the molded product.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

This embodiment is applied to extrusion molding of a glass run 31 made of rubber and having a substantially U-shaped cross section as shown in FIG. A coating liquid 35 is applied to the inner surfaces of 33 and 34.

FIG. 2 shows the main parts of an extrusion molding machine equipped with a die structure according to the present invention.

In the figure, 1 is a cylinder barrel that has a screw 2 inside and supplies the rubber material kneaded by the screw 2, and 3 is a cylinder barrel that is fitted to the outer periphery of the dead end of the cylinder barrel 1. Department. A breaker plate 4 is disposed at the tip inside the silicator barrel 1 to rectify the flow of the plasticized rubber material. A disk-shaped main cap 5 is disposed at the tip of the cylinder barrel 1, and a disk-shaped applicator cap 6 is disposed outside the main cap 5.

The main cap 5 and the coating cap 6 are closely stacked on top of each other, and are held at the tip of the seven-liner barrel 1 by a holding member 7 screwed onto the tip of the hem I part 3.

The head portion 3 also includes a heating tube 8 for heating the rubber material by passing steam or the like.

FIG. 1 is a sectional view showing details of the main cap 5 and the coating cap 6, and FIG. 4 shows the front surface of the main cap 5, that is, the right side surface in FIG. . As is clear from these figures, a material passage 9 having a shape corresponding to the cross-sectional shape of the glass run 31 is formed through the main cap 5 . Therefore, the comb material sequentially supplied under pressure by the screw 2 is extruded into a predetermined shape through the material passage 9 of the main mouthpiece 5. Further, three perforated holes IO are provided at a relatively upper portion thereof, and two positioning holes 11 are recessed at a relatively lower portion thereof.

Next, FIG. 5 shows the front side of the coating nozzle 6, that is, the right side in FIG. 1, and FIG. 6 shows the back side of the coating nozzle 6, that is, the right side in FIG. Showing the left side. As is clear from these figures, the coating nozzle 6
An opening 12, which is slightly larger than the material passage 9 of the main cap 5, is formed therethrough. Note that the area where the coating liquid 35 is applied is precisely machined so that the inner wall surface 12a has a slight step (approximately 0.5 mm) with respect to the inner wall surface 9a of the material passage 9. In this case, the shape has a considerably large margin with respect to the material passage 9. Furthermore, three through holes 13 that match the screw holes 10 of the main cap 5 are provided at a relatively upper portion of the applicator cap 6, and three through holes 13 that match the screw holes 10 of the main cap 5 are provided at a relatively lower portion of the applicator cap 6. A positioning pin 14 that fits into the positioning hole 11 is implanted. The coating mouthpiece 6 is positioned relative to the main mouthpiece 5 by fitting with the positioning pin 14, and is fixed integrally with three screws 15 as shown in FIG.

On the other hand, three liquid supply pipes 16 are installed on the front side of the coating metal 6 described in ``2''.
or fixed. A fan-shaped groove-shaped liquid supply passage 17 extending from a passage hole 20 connected to the liquid supply pipe 16 to a desired liquid application site is recessed on the back surface of the coating nozzle 6. The liquid discharge port 18 at the tip of the liquid supply passage 17 is
As shown in FIGS. 1 and 6, the inner wall surface 12 of the opening 12
It opens at a. Further, as shown in detail in FIG. 7, the liquid discharge port 18 is formed so that its groove depth is shallower than the portion of the liquid supply passage 17 near the passage hole 20, and the groove depth is shallower than that of the liquid supply passage 17 near the passage hole 20. A large number of grooves 19 are carved. The liquid supply pipes 16 are each connected to a coating liquid supply device via a rubber tube (not shown) or the like.
A coating liquid made of urethane resin or the like is supplied at an appropriate pressure.

Therefore, in the die structure having the above configuration, the coating liquid supplied from each liquid discharge port 18 is continuously applied to a predetermined portion of the molded product extruded into a predetermined shape through the material passage 9 of the main die 5. become. That is, extrusion molding of the glass run 31 and application of the coating liquid can be performed simultaneously.

Further, in the above embodiment, a large number of grooves 1 are provided at the liquid discharge port 18.
9, the coating liquid can be uniformly supplied over the entire liquid discharge port 18, that is, the coating thickness of the coating liquid 35 in the glass run 31 can be made uniform. Moreover, the flow of the coating liquid is restricted to a certain extent at the liquid discharge port 18, and since there is a certain volume on the first flow side, pressure pulsations of the coating liquid pumped by the pump can be absorbed. It is possible to prevent uneven coating due to this pressure pulsation.

Note that FIG. 8 shows an embodiment in which a metal filter 21 is disposed in a portion of the liquid supply passage 17 near the liquid discharge port 18 in order to absorb the above-mentioned pressure pulsations. As the metal filter 21, for example, one made of stainless steel fiber in the form of a fabric, one made of sintered metal particles of aluminum, brass, copper, etc. are used.

Further, FIG. 9 shows an embodiment in which a large number of fine rectifying pipes 22 are arranged in a portion of the liquid supply passage 17 near the liquid discharge port 18 in order to similarly absorb pressure pulsations. Also,
Instead of the rectifying pipe 22, etc., a rectifying member 23 made of a corrugated metal plate is installed in the liquid supply passage 1, as shown in FIG.
It may be arranged within 7.

Furthermore, in the above embodiment, an example in which a coating liquid is applied to the glass run 31 has been described, but the present invention is not limited to this, and can be applied to various extrusion molded products when applying a coating liquid, paint, etc. Can be applied. In particular, it can be applied to the case where a liquid is applied to the inner circumferential surface of an extrusion molded product in the shape of a hollow tube.

Effects of the Invention As is clear from the above explanation, the extrusion molding machine nozzle structure according to the present invention allows coating liquid or paint to be applied to the extrusion molding machine nozzle at the same time as extrusion of glass runs, user strips, etc. Application can be carried out continuously. Therefore, compared to the conventional case where coating is performed by spraying, the work process can be significantly simplified and equipment for spray coating is not required. Furthermore, it is possible to minimize the amount of coating applied only to the necessary areas, thereby preventing wasteful consumption of coating liquid and the like. In addition, when applied to partial coloring, there is an advantage that the boundary with non-colored areas becomes clear and masking is not necessary.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a die structure according to the present invention, taken along line I-I in FIG. 6, and FIG. 2 is a cross-sectional view of the main parts of an extrusion molding machine equipped with this die structure. , FIG. 3 is a sectional view showing an example of a molded product formed by this die structure,
Fig. 4 is a plan view showing the front side of the main nozzle, Fig. 5 is a plan view showing the front side of the applicator nozzle, Fig. 6 is a plan view showing the back side of the applicator nozzle, and Fig. 7 is a plan view showing the front side of the applicator nozzle. 8 is an enlarged perspective view of the liquid supply passage, and FIGS. 8 and 9 are enlarged perspective views of the liquid supply passage showing different embodiments of the present invention.
FIG. 10 is a perspective view showing an example of a rectifying member. 5. Main cap, 6. Application cap, 9. Material passage, 1
2...Opening part, 16...Liquid supply pipe, 17 Liquid supply passage,
18・Liquid discharge port. 2 other people - 1 1a

Claims (1)

[Claims] (1) A main cap that is attached to the tip of the extrusion molding machine and has a material passage formed therethrough in a shape that corresponds to the shape of the desired molded product, and a coating cap that is attached to the outside of this main cap to overlap. The coating nozzle has an opening slightly larger than the material passage formed therethrough, and a liquid discharge port is formed on the inner wall surface of the opening corresponding to the desired liquid application site. A mouthpiece structure for an extrusion molding machine, characterized in that a liquid supply passage leading to the liquid discharge port is formed inside the application mouthpiece.