JP2864618B2 - Extrusion molding method for resin molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an extrusion molding method for a resin molding for automobiles comprising a core material coated with a resin and a decorative film.

(Prior Art) As an extrusion molding method for a resin molding for automobiles, a molding extrusion line shown in FIG. 5M is used.

That is, 1 is a core material made of an aluminum thin plate, 2 is a mold, 2 is a molded product, 4 is a cooling bath of a resin molding, 5 is a film, 6 is a resin material extruder, and 7 is a molding take-up machine. It is.

FIG. 6 is an explanatory view of the molding extrusion process, in which the core material 1 and the film 5 are sent to the mold 2, and the molten PVC resin 8 (indicated by the arrow) sent from the extruder 6 is used for the core material 1. Is cooled, and the resin molding 3 in which a part of the film 5 is exposed is formed.

FIG. 7 is a cross-sectional view of the molding 3 in which 1 is a core made of an aluminum thin plate, 5 is a decorative film, and 9 is a cured PVC resin.

(Problems to be Solved by the Invention) However, in the molding extrusion process, the molding speed of the extruded product 3 is 8 m / min.
The core material 1 made of an aluminum thin plate is used in a coil state.
A coil of 1,000m will lose its coil in about 5.5 hours in the continuous production of the mall.

Therefore, when the core material runs out, the molding extrusion molding line M is stopped, a new coil is updated again, the core material 1 is set in the mold 2, and the molding line is started.

For this reason, there is a problem that the condition adjustment that occurs when the molding line is restarted and that the amount of product discarded for the test is extremely large, which affects the cost up of the resin molding.

The present invention provides a molding extrusion molding line in which molding of a resin molding can be continuously performed without stopping the molding line even when a new core material is successively updated and used without a core material in the molding extrusion line. The method is a technical issue.

[Configuration of the invention]

(Means for solving the problem) The technical measures taken to solve the problem are as follows. That is, in a resin molding extrusion molding line in which an extruder and a mold cover a core material made of an aluminum thin plate with a resin, when the core material is lost, the next core material is renewed and supplied. Attach the adhesive tape with a length equal to or greater than the width of the mold to the joint between the previous core material and the next core material, send the next core material to the mold, and stop the resin molding extrusion molding line This is an extrusion molding method for a resin molding in which the resin molding is continuously extruded without performing the molding.

(Operation) When the core material is almost exhausted, the former core material and the next core material are adhered to each other with an adhesive tape, and the connecting portion between the two is adhered to the mold. Is heated at about 150 ° C., and the adhesive layer of the adhesive tape melts.
(The tape part of the adhesive tape has sufficient heat resistance.) If the adhesive tape is shorter than the width of the mold, the adhesive layer of the tape to which the core material is adhered is melted due to high temperature and separated by the adhesive tape. Both cannot be supplied.

However, if the adhesive tape is longer than the width of the mold, even if the tape that has adhered to the previous core material passes through the high-temperature mold, it is immediately sent out of the mold and cooled to separate the core material and the adhesive tape. Sticks securely without

Therefore, the next core material stuck with the tape can be fed into the mold.

Example An example will be described below.

In the resin molding extrusion molding line shown in FIG.
11 is the previous core material, 10 is the new core material, 12 is the adhesive tape,
When the previous core material 11 is completed, a new core material 10 is attached with an adhesive tape 12 to be integrated.

The tape portion of the adhesive tape 12 has sufficient strength at a high temperature (about 150 ° C.), and the adhesive layer melts at a high temperature and solidifies by cooling.

As shown in FIG. 2, the adhesive tape 12 and the core material 10 are separated from each other by the adhesive layer 13 of the tape when the joining portion 14 enters the mold 2 and the adhesive layer 13 of the tape starts to melt due to the ambient temperature of 150 ° C. in the mold. The material 11 and the new core material 10 are separated by the melting of the adhesive layer.

This embodiment is to a core material 11 and S ₁ the length of the adhesive tape to be used in the joint portion of the horizontal width of the mold length of more than S a new core material 10 before, as shown in FIG. 3 .

12b is an adhesive tape adhered to the previous core material 11, and is also adhered to the next core material 10 as shown in 12a.

When the connecting portion 14 of the core material is on the left side of the mold, the core material 11 and the adhesive tape 12b are cooled and the adhesive layer 13 of the adhesive tape is adhered to the core material 11, and the resin material 15 from the extruder is used to form the resin. Even if the molding is performed and the resin molding 3 is moved by the take-off machine, the joining portion 14 is not cut at the joining portion 14 because the core material 11 and the core material 10 are adhered with the adhesive tape 12b.

In this way, if the material of the adhesive tape 12 is selected in consideration of only the resin pressure in the mold and the product take-up strength, the adhesive tape of the core material 10 can be attached at the joint 14 with a length equal to or longer than the entire length of the mold. The core material 10 is successively moved to the mold, and as shown in FIG. 4, the connecting portion 14 is sent to the right outside of the mold 2, so that the resin molding can be formed without stopping the line.

(Effects of the Invention) The present invention has the following effects. (1) In the resin molding extrusion molding process, there is no stoppage of the molding molding line due to the renewal of the core material, and therefore, there is no defective disposal of the resin molding at the time of restart.

(2) The line operation rate is greatly improved by eliminating the stop of the molding line.

[Brief description of the drawings]

FIG. 1 is a view for explaining the external appearance of the present invention, FIG. 2 is a view for explaining the situation in the mold in the case of a short mounting tape, and FIG. 3 is a view for explaining the situation before the connecting portion enters the mold in the embodiment. Fig. 4, Fig. 4 explains the situation when the connecting portion moves out of the mold, Fig. 5 shows the overall appearance of the resin molding extrusion line, and Fig. 6 shows the inside of the mold for core material, film and resin. FIG. 7 is a cross-sectional view of a PVC resin molding. 2 ... Mold, 3 ... Resin molding, 8,15 ... Resin flow,
1,10,11 …… Core material, 12,12a, 12b …… Mounting tape, 13 ……
Adhesive layer of adhesive tape, 14 ... A connecting part between core materials.

Claims (1)

(57) [Claims] 1. In a resin molding extrusion molding line for supplying a core material to a mold and coating the resin, when the core material is lost,
When renewing and supplying the next core material, an adhesive tape having a length equal to or greater than the width of the mold in the supply direction is adhered to the joint between the previous core material and the next core material, and the next A resin molding method in which a core material is fed into a mold and the resin molding is continuously extruded without stopping the resin molding extrusion line.