JPH06182825A - Injection molded product and arrangement thereof - Google Patents

Abstract

PURPOSE:To provide an injection-molded product wherein the same molded parts are collected in a form easy to perform post-treatment and to efficiently arrange the molded parts prior to post-treatment. CONSTITUTION:A molded product 10 has such a form that a plurality of molded parts 5 are connected by runners 8 and a projection 11 used as an index discriminating the surface and rear as well as left and right of the molded product 10 is provided to a part of the runners 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plastic injection molded product, and is particularly suitable for small articles and symmetrical molded articles.

[0002]

2. Description of the Related Art In the plastic injection molding method, a multi-cavity molding in which several identical parts are molded in one injection process is known to be easier to apply to small products, as is known from the Japan Institute of Invention and Innovation Technical Report 92-8023. This is a well-known technique. After the injection molding, the molded parts 2 are connected by a rod-shaped connecting portion 4 in which a plastic in a resin injection passage called a runner is solidified as shown in FIGS. 6 and 7. But,
In this state, the entire molded product 3 is easily entangled with each other and is not suitable for transportation. Therefore, the molded component 2 is usually separated from the runner 4 immediately after being taken out from the injection molding machine. In addition, post-processing such as printing, labeling, coupling and assembling with other components is often performed on each component 2 after injection molding.

The following is an example of a plastic injection molding process when the post-treatment is printing. Molding → Unloading → Runner separation → Container packing → Transportation → Alignment → Printing → Container packing → To the next process

[0004]

However, in the case of the above process, the front and back sides and the directions of the molded parts are different after the runners are separated, and the work of alignment is required before the printing process is performed. This work is otherwise troublesome, and if the molded part has a symmetrical shape or is small in size, it becomes very difficult, resulting in a time loss in manufacturing, resulting in a reduction in productivity.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and provides an injection-molded product in which the same molded parts are put together in a form that can be easily post-processed. It is an object of the present invention to provide a method for aligning molded parts in a mold.

[0006]

In order to achieve the above object, in the invention according to claim 1, the same parts are arranged on the same plane and these parts are surrounded by a runner. An index is formed to identify the front and back of the entire formed article, and the direction. In the invention described in claim 2, a plurality of identical parts are injection-molded so as to be surrounded by the runners, and the parts are not separated from the obtained molded product but aligned as they are with a part of the runner as a reference. Is done.

[0007]

According to the above, the injection-molded product has a shape in which a plurality of identical parts are surrounded by runners, and each of the parts does not project like a branch. Therefore, a large number of such injection-molded products are handled. Sometimes they don't get entangled with each other. Further, since the runner is provided with an index capable of discriminating between the front and back and the left and right of the injection-molded product, the positioning at the time of post-processing can be easily performed. Furthermore, since a plurality of identical parts are arranged in a group, post-processing can be efficiently performed.

[0008]

EXAMPLE FIG. 2 shows a finally required molded part (single unit). The molded part 5 has a length and width of 6 mm and a thickness of 1.5.
After the injection molding, a red plate 6 is formed on a triangular step formed on one side of the rectangular plate part having a size of mm. When the molded parts 5 are injection-molded, they are not molded one by one, but a plurality of molded parts 5 are arranged on the same plane as shown in FIG. It is obtained as a connected molded product 10.

As shown in FIG. 1, a protrusion 11 is integrally formed on a part of the runner 8 of the molded product 10. The protrusion 11 is used as an index for identifying the front and back of the molded product 10 and the left and right. Therefore, the position and shape of the protrusion 11 are determined so that the molded product 10 is rotationally asymmetric. The molded products 12, 13 shown in FIGS.
However, the front and back and the left and right can be similarly identified by the indexes 12a and 13a.

Unlike the conventional molded product as shown in FIGS. 6 and 7, the molded product 10 has most of the molded component 5 surrounded by the runner 8 and arranged on the same plane. The molded products 10 do not get entangled with each other. Therefore, when a large number of these molded products 10 are handled, for example, when a large number of molded products 10 are placed in a container or the like and transported, they can be easily handled as plate-shaped products.

The printing 6 on the molded part 5 is carried out before the molded parts 5 are individually separated from the runner 8. FIG. 5 schematically shows the situation. Molded product 10 obtained in the form of FIG.
Is supplied to a pedestal 16 having a groove 15 into which the molded product 10 is just fitted. As described above, since the molded product 10 is provided with the protrusion 11, the pedestal 16
The molded product 10 fitted in is positioned on the pedestal 16 with the triangular step to be printed facing forward and the upper, lower, left and right postures being constant.

The pedestal 16 is intermittently sent to the printing station by a conveyor such as a belt or a chain. When the molded product 10 is sent to the printing station, the printing plate 1
7 is lowered and printing is performed. In the case of the illustrated example, the printing plate 17 is a plate that allows the five molded parts 5 to be printed in red at once. Since the molded product 10 is positioned on the pedestal 16 by the groove 15, the plate 17 is lowered as it is, and printing is simultaneously performed on the five molded parts 5. When printing,
Printing 6 is performed one by one using the plate for one of the molded parts 5, or the plate 17 is enlarged to form two or more molded products 1.
It is also possible to print all at once.

After the printing process, the molded product 10 is removed from the pedestal 16 and the molded parts 5 are individually separated from the runner 8. The completed molded part 5 is packed in a container or the like, and the runner 8 is crushed by a crusher and then recycled as a raw material. In addition, the molded product 10 is placed on the pedestal 16.
Alternatively, the runner 8 and the molded part 5 may be separated from each other.

According to the above, since the printing process can be collectively performed before the fine molded parts 5 are separated from each other after the injection molding, not only the efficiency of the printing work can be improved but also the pre-printing can be performed. Positioning and alignment can be done easily. It should be noted that the plurality of molded parts 5 integrated as the molded product 10 may be subjected to various post-processings such as, for example, sticking a label or a seal and coupling with other parts, in addition to the above-mentioned printing process. it can.

[0015]

As described above, the injection-molded product of the present invention has a configuration in which a plurality of molded parts are arranged in a plane and surrounded by a runner, so that it is easy to handle after injection molding. Is. Moreover, since a part of the runner is integrated with an index that can uniquely identify the posture of the molded product, it is possible to position the molded product securely during post-processing of the molded product, and at the same time for each molded part. Can also be arranged in a certain state.

[Brief description of drawings]

FIG. 1 is a plan view of a molded product according to the present invention.

FIG. 2 is a perspective view of a molded part obtained from the molded product shown in FIG.

FIG. 3 is a plan view of a molded product using another embodiment of the present invention.

FIG. 4 is a plan view of a molded product using still another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a printing process.

FIG. 6 is a plan view showing a conventional example of a molded product.

FIG. 7 is a plan view showing another conventional example of a molded product.

[Explanation of symbols]

 5 Molded parts 6 Printing 8 Runners 10 Molded parts 11 Protrusions

Claims (2)

[Claims] 1. An injection-molded article integrally formed by connecting a plurality of same parts, wherein each part is arranged on the same plane, and a runner connected to at least a part of the plurality of parts is the plurality of parts. And an index is formed on a part of the runner so that the entire molded product is rotationally asymmetric and left-right asymmetrical. 2. A method of aligning a plurality of identical parts obtained by injection molding for post-processing, wherein the plurality of identical parts are arranged in the same plane and are runners. A method for aligning injection-molded articles, comprising integrally molding so as to be entirely surrounded by, and aligning the entire molded articles with a part of the runner as a reference.