JPH058098Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double wall structure made of synthetic resin, and is aimed at obtaining a marble pattern with a high decorative effect.

2. Description of the Related Art Marble patterns, which are created by utilizing the flow of resin material used to mold products, are known as an effective means of decorating synthetic resin products by changing their color.

This marble pattern is created by placing a control resin, which is a resin material of a different color than the base resin, inside the base resin, which is the main resin material used to mold the product, and then molding the product. Conventionally, when forming this marble pattern, in order to create a clearer color pattern,
The color of the control resin was set to be significantly different from the base resin.

Therefore, the traditional marble pattern achieved its decorative effect through the contrast between the richly varied linear pattern and clear color changes. At the same time, it had become superficial and lacked depth.

The present invention eliminates the dissatisfaction in the conventional example,
This invention was devised to obtain an unprecedented marble pattern decorative effect, and the invention will be explained below with reference to the drawings.

The present invention consists of a colored opaque synthetic resin inner shell 4 as part of a mold, and a synthetic resin outer shell 1 that is insert-molded to cover the entire outer surface of the inner shell 4. It is a double wall structure made of resin,
Outer shell 1 is made of polyethylene terephthalate resin (hereinafter simply referred to as PET) and polybutylene terephthalate resin, which are injected from the main injection device of a multicolor injection machine and colored with a pigment in the same color as inner shell 4. A control resin made of a PET material injected from the auxiliary injection device of a multicolor injection machine and colored appropriately with pigment is placed in a base resin made of a translucent mixed resin material without stirring. It is composed of

As described above, since the base resin, which is the main resin material for molding the outer shell 1, is semi-transparent, the control resin located within the base resin can be seen from outside the outer shell 1. The marble pattern that appears has a three-dimensional effect, and a deep decorative effect is created.

In addition, since the inner shell 4 is colored and opaque, and the outer shell 1 is colored in the same color as the inner shell 4, the entire appearance becomes muddy in the color of the inner shell 4.
The color of the control resin is positioned in a marble pattern within this cloudy color.

For this reason, when the color of the control resin is set to a relatively light neutral color, and the same pigment added to the control resin is added to the base resin, and the outer shell 1 is molded, the color appears. As the marble pattern becomes lighter,
It gives a deep and calm feeling.

The inner shell 4 is mainly molded from PET in view of the assembly strength with the outer shell 1 and the molding conditions of the outer shell 1, but depending on other molded products to be assembled, AS resin may be used. It is also possible to mold it from a relatively hard resin material such as.

In contrast to the inner shell 4, the outer shell 1 is mainly molded from PET from the viewpoint of surface gloss and deep transparency. , to make the whole translucent, polybutylene terephthalate resin is mixed.

The illustrated embodiment shows a case in which the present invention is applied to a screw cap, in which both the outer shell 1 and the inner shell 4 have a cylindrical shape with a top, and the inner shell 4 includes a bottle (not shown). ) is fitted and fixed with a threaded cylindrical body 7 that directly achieves screw engagement with the cylindrical body 7.

This threaded body 7 is injection molded into a capped cylindrical shape, with a top plate 8 having a seal thread 11 circumferentially provided on its lower surface connected to the upper end of the threaded barrel 9 having threads 10 provided on its inner peripheral surface. Achieves a strong threaded connection to the bottle body.
It is molded from relatively soft polypropylene resin in order to hold the bottle firmly and to keep it tightly sealed.

The outer shell 1 and the inner shell 4 are combined with the spiral cylinder 7 to form a screw cap. In the illustrated embodiment, the external shape of the cap is shaped like a flattened sphere. In order to achieve this, the peripheral wall portion is shaped to be thick.

That is, the outer shell 1 has a cylindrical shape with a capped top plate 2 and the circumferential wall 3, and the inner shell 4 has a cylindrical capped shape with a top wall 5 and a circumferential wall 6.
The boundaries between the top plate part 2 and the peripheral wall part 3, and between the top wall part 5 and the peripheral cylinder wall part 6 are not angular but have smooth arcuate surfaces.

Various colors and combinations of the outer shell 1 and inner shell 4 can be considered, and are not limited in any way, but an example of a configuration in which the inner shell 4 is milky white, which is considered to be the most common color, will be explained. .

The base resin is a mixture of primary color PET and milky white polybutylene terephthalate resin at a weight ratio of approximately 1/2 of the primary color PET.
A control resin mixed with brown pigment at a weight ratio of about 5/100 is stirred together with a control resin at a weight ratio of about 1/4 of the base resin using a multicolor injection machine. The outer shell body 1 was molded by injection while the shell body 1 was kept in position without any adjustment.
This outer shell body 1 exhibits a brown marble pattern, but the difference in color between the brown portion and other portions appears somewhat clearly.

Therefore, in the base resin mentioned above, we added PET colored in ivory color to approximately 10% of the primary color PET.
PET is mixed at a weight ratio of 1/2, and PET colored ivory is added to the control resin as a primary color.
When the outer shell 1 is formed by mixing PET at a weight ratio of about 1/10, it is possible to obtain a marble pattern in which the color change is not clear and the color change is light overall.

In this way, since the outer shell 1 is molded from a translucent resin of the same color as the inner shell 4, it is possible to obtain a visually deep appearance, and at the same time, the opaque inner shell 4 is made of a translucent resin that is the same color as the inner shell 4. Since it forms the back of the body 1, the spiral body 7 and other assembly members are not visible through the outer shell 1, and the inner shell 4, which forms the back of the outer shell 1, also Since it has the same color as the inner shell body 4, it cannot be visually identified.

In the case of the illustrated embodiment, if the gate marks were located on the easily visible outer surface of the outer shell 1 that directly forms the outer surface of the product, the appearance of the product would be significantly deteriorated. As such, it is preferable to position the gate G on the lower surface of the product, which is the outer surface that is difficult to see.

As is clear from the above description, the present invention can produce a pale deep marble pattern, so it is extremely suitable as a decoration for products that require an elegant appearance, such as cosmetic containers and caps. In addition, since the inner shell is opaque, the inside of the molded structure is not visible, and the decorative effect will not deteriorate due to seeing through the inside, etc., and has many excellent effects. It is something.

[Brief explanation of the drawing]

The figure is an overall vertical sectional view showing an embodiment of the present invention. Explanation of the code, 1...Outer shell, 2...Top plate, 3
...Peripheral wall part, 4...Inner shell body, 5...Top wall part, 6...
... Circumferential tube wall, 7... Spiral body, 8... Top plate, 9...
Spiral tube, 10...Screw thread, 11...Seal thread, G...
Gate.

Claims (1)

[Scope of utility model registration request] A synthetic resin double-walled structure constructed by insert-molding a colored opaque synthetic resin inner shell as part of a mold and insert-molding a synthetic resin outer shell covering the entire outer surface of the inner shell. The outer shell is made of translucent polyethylene terephthalate resin and polybutylene terephthalate resin, which is injected from the main injection device of a multicolor injection machine and colored with a pigment in the same color as the inner shell. A control resin made of a polyethylene terephthalate resin material injected from the auxiliary injection device of the multicolor injection machine and colored appropriately with a pigment is placed within a base resin made of a mixed resin material without stirring. A double wall structure made of synthetic resin.