JPS6029334B2 - Manufacturing method for multicolored soft molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a pattern on a soft molded product, and more specifically, the present invention relates to a method for forming a pattern on a soft molded product, and more particularly, a gate is applied to a molded product body made of a soft polymeric material having a pattern recess on the surface, and a back surface and a pattern recess. After making the hole, the molded product body is set in a mold, and the cavity formed by the pattern recess and the inner wall surface of the mold is filled with a material with a different color from the molded product body through the gate hole by injection to form the molded product. The present invention relates to a method of forming a pattern on a paper.

Here, the pattern refers to characters, figures, symbols, or a combination of these.

Conventionally, there was a method of injecting and filling a molded product body made of a rigid material with a different color material to obtain a multicolored molded product.
When the main body of the molded product is made of a soft member, the joint portion is deformed due to changes in the injection pressure or injection amount of different colored materials during injection molding, making it impossible to obtain a multicolored molded product with a good appearance.

Another method has been seen in which a protruding wall is provided on the joint surface of the mold with the molded product body to prevent the above fluctuations and obtain a multicolored soft molded product, but the joint surface is not uniform and wax, dust, etc. There was a problem that the metal particles easily entered the grooves formed by the walls of the mold, spoiling the appearance. Other methods for producing multi-colored soft molded products include low-pressure potting methods, painting methods, and hot stamping methods, but these methods also have limitations such as parting durability and material limitations, making it desirable to produce multi-colored soft molded products. No molded product was obtained. In view of the above, it is an object of the present invention to provide a method for producing a multi-colored flexible molded product that has a uniform joint surface and a good appearance, regardless of variations in the injection pressure or injection amount of different-colored materials.

The gist of this invention is to provide a molded product body made of a sensitive polymer material with a gate hole that passes through the patterned recesses on the surface and the bag surface, and then set the molded product in a mold, and then connect the patterned recesses and the mold. When forming a pattern on a molded product by injecting a material with a different color from that of the molded product body into the cavity formed by the inner wall surface through the gate hole, a different color material that can absorb the excess pressure of the different color material after filling the pattern recesses is used. The present invention provides a method for producing a multicolored flexible molded product, in which a concave portion for inflow is provided through a gate hole on the back surface of the molded product body or on the surface of the mold that abuts the back surface of the molded product body.

Hereinafter, the method of the present invention will be explained in detail based on the drawings.

As shown in FIGS. 1 and 2, a molded product body 1 made of European polymer material with patterned recesses 2 on its surface is provided with a gate hole 3 through which the back surface and patterned recesses 2 fit together. A narrow groove 7 is provided on the back surface of 1 so as to communicate with the gate hole 3.

Furthermore, a runner groove 10 is provided on the back surface of the molded product main body 1 to accommodate each gate hole 3. Although it is desirable to provide this runner groove 101 during molding of the molded product body 1, it is not necessary when a runner is provided in the mold or when there is only one gate hole 3. Here, the gate hole 3 and the narrow groove 7 may be provided during molding of the molded product main body 1 or after molding, but it is preferable to provide the gate hole 3 after molding. The molded product body 1 is manufactured by injection molding, press molding or cutting after extrusion, and the molding material is P.
A soft polymer material such as VC, TPR, EVA, etc. is used. Subsequently, the molded product main body 1 provided with the gate hole 3 is set in the fixed mold 5a and the movable mold 5b.

Here, the molded product main body 1 is iron-fitted into a set space 11 formed by a fixed mold 5a and a movable mold 5b, and a cavity 12 is formed by the inner wall surface of the set space 11 and the pattern recess 2. next,
When a different color material made of a polymeric material different from that of the molded product body 1 or a polymer material of a different color tone is injected into the sprue 13 of the fixed mold 5a using an injection machine, the different color material passes through the gate hole 3 and fills the cavity 12.

After filling the cavity 12, the excess different color material flows into the pongee groove 7. After the different color material has hardened, the mold is opened and the sprue portion is cut out, producing a multicolor soft molded product having patterned portions 14 as shown in FIG. Here, the pongee groove 7 allows the different color material to flow in at a pressure lower than the pressure at which the pattern recess 2 begins to deform due to the excessively filled different color material, and requires a larger pressure for the different color material to flow in compared to the gate hole 3. The size is as follows.

Another method of providing a concave portion on the back surface of the molded product body 1 through which an excessive amount of different color material can flow is as shown in FIG. A pongee groove 7 having a recess 9 for storing a different color material may be provided.

Furthermore, as shown in FIG. 5, a narrow groove 7 is formed to fit the gate hole 3
A patterned recess 2 is provided between the recess 9 and the recess 9 that collects excess different color material.
It is also possible to provide a thin wall 8 that breaks or deforms at a pressure lower than the pressure at which it begins to deform. Next, as shown in FIG. 6, a fixed mold 5a that abuts the back surface of the molded product body 1 is provided as a method of providing a recess into which an excessive amount of different color material can flow into the mold that abuts the back surface of the molded product body 1. A narrow twill 7 is provided on the surface of the fixed mold 5a by passing the sprue 13 through it, and a recess 9 is provided on the surface of the fixed mold 5a by passing the thread through the end of the narrow groove 7.

Here, similar to the method described above, the narrow groove 7 allows the different colored material to flow in at a pressure lower than the pressure at which the pattern recess 2 begins to deform due to the excessively filled different colored material, and the different colored material can flow into the narrow groove 7 compared to the gate hole 3. This structure requires a large amount of pressure for the inflow of water. The method for producing a multicolored soft molded product of the present invention is configured as described above, and the excessively filled different color material contacts or contacts the back surface of the molded product body before deforming the pattern recessed portion of the molded product body. It flows into the recesses provided on the surface of the mold, does not deform the pattern recesses, and can produce multicolor soft molded products with uniform joint surfaces and good appearance, regardless of the injection pressure or injection amount of different color materials. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view of a molded product body made of a soft polymer material, FIG. 2 is a cross-sectional view showing the molded product body set in a mold in the method of the present invention, and FIG. 3 is a method of the present invention. A cross-sectional perspective view of a multicolor molded product manufactured by
6 to 6 are cross-sectional views showing a molded article body set in a mold in another embodiment of the method of the present invention. 1... Molded product body, 2... Pattern recessed part,
3...Gate hole, 5a, 5b...Mold, 7...Small groove, 12. ．． ····cavity,
8, 9... Concavity that can absorb excess pressure. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. After providing a molded product body made of a soft polymer material with patterned recesses on the surface and providing a gate hole that communicates the back surface with the patterned recesses, the molded product body is set in a mold, and the patterned recesses and the mold are placed. In a method of forming a pattern on a molded product by injecting a material with a different color from that of the molded product body into a cavity formed by the inner wall surface of the molded product through the gate hole, excessive pressure of the different color material after filling the pattern recess is suppressed. A multicolor soft molded product, characterized in that a recess into which the absorbable different color material flows is provided in the back surface of the molded product body or in the surface of the mold that comes into contact with the back surface of the molded product body, communicating with the gate hole. Production method.