JPH0976284A - Method and apparatus for manufacture of plastic molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a plastic molded product wherein a label is surely provided at a specific position by a simple process. SOLUTION: A suction port 5 is formed to a cavity mold 1, a label is sucked by the suction port 5, and clamping is carried out according to a sucked state of the label 7. Molten resin is injected into the clamped cavity, and cured. The label 7 can be integrated at the same time when a plastic molded product is molded, and a process becomes simple. Since the resin is injected under a state wherein the label 7 is sucked to be fixed to a mold, the label can be surely provided at a specific position of the plastic molded product without any positional shear of the label 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for manufacturing a container body and its lid by resin injection molding, and a manufacturing apparatus applied to this manufacturing method.

[0002]

2. Description of the Related Art The main body of a container made of a plastic molded product or its lid is required to display information such as description of product contents, manufacturer and date of manufacture on its surface. Conventionally, this display is performed by printing the above-mentioned information on a label, separately forming a container body or a lid by injection molding, and sticking the label on the surface of these molded articles.

[0003]

However, in the conventional display, it is necessary to print a label, mold a container or the like, and attach a label to the container or the like, which requires many steps and is a troublesome work. Was there. In particular, when the label is small, it is difficult to attach the label to the correct position, and it is often impossible to attach the label to the proper position, resulting in a large number of defective products, resulting in a high defect rate. Further, the attached label has a problem that the label is easily peeled off, and this peeling off lowers the commercial value.

The present invention has been made in consideration of such conventional problems, and it is possible to attach a label at an accurate position to a molded product by a simple process, and further, to prevent the label from peeling off. It is an object of the present invention to provide a method for producing a plastic molded article that does not have a plastic molded article. Another object of the present invention is to provide a manufacturing apparatus that can be suitably implemented in this manufacturing method.

[0005]

According to the method for producing a plastic molded article of the present invention, a mold label is clamped in a state where a film-shaped label is adsorbed on the molding surface of one mold to form a cavity, and then a molten resin is formed. Is injected into the cavity and cured.

In this method, the label is adsorbed on one of the molds, and the positional fluctuation of the label with respect to the mold is suppressed. By injecting molten resin into the cavity of the mold for the label positioned in this way and curing it,
It is possible to manufacture a plastic molded product in which the cured resin and the label are integrated. Therefore, the label can be easily and surely placed in the fixed position and is not peeled off.

In the manufacturing apparatus of the present invention used in this method, one mold having a suction portion for sucking a film-like label on the molding surface and a gate for injecting molten resin are formed,
And the other mold forming a cavity by abutting against the one mold.

In this apparatus, since the suction portion of one mold holds the label by suction, the label can be attached to the one mold at a fixed position. In this state, a pair of molds are clamped to form a molding cavity,
A plastic molded product in which the label and the resin are integrated can be molded.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an embodiment of a manufacturing apparatus according to the present invention, which is a mold 1 as a movable mold.
And the core mold 2 as a fixed mold face each other. The mold 1 is fixed to a movable mounting plate 3 attached to a movable platen (not shown), and a surface facing the core mold 2 is a molding surface 4. The mold 1 is provided with a plurality of suction holes 5 as suction portions.

A suction hole 5 as a suction portion penetrates the mold 1 in the thickness direction. A rod member 6 is inserted in each suction hole 5. The rod member 6 is formed with a diameter smaller than that of the suction hole 5 and is inserted into the suction hole 5, and the label 7 is adsorbed through the gap between the rod member 6 and the suction hole 5. This suction is performed by depressurizing the inside of the suction holes 5. An exhaust passage 8 communicates with each suction hole 5, and the exhaust passage 8 is connected to a vacuum pump (not shown). In this case, the suction hole 5 is provided in the suction area of the label 7.

The core mold 2 is fixed to a fixed side mounting plate 9 mounted on a fixed side platen (not shown) with bolts 10 or the like. The core die 2 has a molding surface 11 facing the cavity die 1. When the cavity die 1 moves so as to face the core die 2 and is clamped, the core die 2 and the cavity die 1 are moved. The molding surfaces 4 and 11 form a cavity for molding.

A runner 12 communicating with a heating cylinder (not shown) for melting the resin penetrates through the core mold 2. The tip portion of the runner 12 is opened in the molding surface 11 of the core mold 2, and this opening portion serves as a gate 13 for injecting the molten resin into the cavity. 14 is a heater for heating the molten resin in the runner 12 to maintain the molten state,
A coil is wound around the outer peripheral portion of the runner 12.
Reference numeral 15 is a nozzle that moves back and forth in the runner 12 to open and close the gate 13.

Next, the production of a plastic molded product will be described with reference to FIGS. FIG. 1 shows the mold open state, and the label 7 is carried into the mold by the robot hand 17. Label 7 has a product description, manufacturer, and
The date of manufacture and other information are printed. The label 7 is made of a material such as paper, non-woven fabric, cloth, resin or the like and formed into a film. The material of the label 7 is preferably the same as the molten resin injected from the gate 13 in terms of integration with the molded product. Therefore, in the case of paper, non-woven fabric, or the like, or a resin different from the molten resin, at least the same resin as the molten resin is laminated on the surface of the label 7 on the gate 13 side.

In the state of FIG. 1, the robot hand 17 is oriented so that the label 7 is located on the side of the mold 1, and the robot hand 17 moves to bring the label 7 to a predetermined position on the molding surface 4 of the mold 1. Abut. By this contact, the suction hole 5 of the mold 1 sucks the label 7, and as a result, the label 7 is sucked to the molding surface 4 of the mold 1 as shown in FIG. By this suction, the label 7 is fixed at the fixed position of the mold 1, and the position does not change. Then, the movable side platen and the movable side mounting plate 3 move while the label 7 is attracted, the cavity mold 1 approaches in the direction of the core mold 2 and is abutted, and mold clamping is performed. As a result, as shown in FIG. 3, the molding cavity 18 becomes the cavity mold 1 and the core mold 2.
Is formed between

FIG. 3 shows a state where the molten resin is injected into the cavity 18 after the mold clamping. The molten resin is driven by a plunger (both not shown) in the heating cylinder,
It gushes from 3 and fills the inside of the cavity 18. And
The molten resin is cooled and cured in the mold clamped state. By this curing, the label 7 and the cured resin 19 are integrated to form a plastic molded product 20. After this curing, the mold 1 is retracted from the core mold 2 to open the mold.

FIG. 4 shows this mold opening state, in which the robot hand 17 is turned upside down with respect to FIG. 1 and then enters the mold opened. Then, the plastic molded product 20 held by the core mold 2 is adsorbed and separated from the core mold 2, and the plastic molded product 20 is released.

In the above manufacturing, the molten resin is injected with the label 7 being adsorbed by the mold 1, so that the label 7 can be securely attached to the plastic molded article 20 at a fixed position. Therefore, defective products due to misalignment of the label are eliminated, and even a small label can be reliably attached at a fixed position. In addition, the label 7 is attached to the plastic molded product 20 by the plastic molded product 20.
Since it can be performed at the same time as molding, the work of attaching the label 7 is unnecessary, the process is simplified, and mass production is possible. Moreover, since the label 7 is integrated with the plastic molded product 20, the label 7 does not peel off, and it is possible to prevent a decrease in commercial value due to peeling off of the label 7.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, the plastic molded product can be formed into another shape, and the plastic molded product is released from the robot hand. Alternatively, it may be carried out by a protruding rod or a stripper. Also,
The label may be sucked only by the suction hole without inserting the rod member into the suction hole.

[0019]

According to the method for producing a plastic molded product of the present invention, the mold is clamped with one of the molds adsorbing the label, and the molten resin is injected to cure the label, so that the label can be securely placed in a fixed position on the molded product. It is possible to prevent the generation of defective products due to displacement. Further, since the label can be attached at the same time when the plastic molded product is molded, the manufacturing process is simplified. Furthermore, since the label is integrated with the molded product, it does not peel off and the commercial value does not decrease.

In the manufacturing apparatus of the present invention, the suction portion for adsorbing the label is formed on one of the molds, so that the label can be accurately and surely set on the mold.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a manufacturing apparatus.

FIG. 2 is a cross-sectional view showing a shift to mold clamping.

FIG. 3 is a cross-sectional view showing an injection state of molten resin.

FIG. 4 is a cross-sectional view of a mold open state after molding.

[Explanation of symbols]

 1 Cavity type 2 Core type 4 Molding surface 5 Suction hole 6 Rod member 7 Label 11 Molding surface 13 Gate 18 Cavity 20 Plastic molded product

Claims (2)

[Claims] 1. A plastic characterized in that after a film-shaped label is adsorbed on the molding surface of one of the molds, a mold is clamped to form a cavity, and then a molten resin is injected into the cavity and cured. Molded article manufacturing method. 2. A mold for forming a suction surface for adsorbing a film-like label on a molding surface and a gate for injecting a molten resin are formed, and a cavity is formed by butting the mold on the one side. An apparatus for manufacturing a plastic molded product, comprising the other mold.