JPH084265Y2 - Label insert mold - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming a label-integrated container by inserting a label into a mold and then injecting a resin, and more particularly to a mold for molding a rectangular container.

[0002]

2. Description of the Related Art A technique for integrally providing a product label (printed on synthetic paper) on a side surface of a cylindrical resin container, for example, a resin cup, that is, a label insert molding technique is well known in the art. The technology is shown in Fig. 3 (a).
As shown in Fig. 3, a label 3 which is lightly rolled in advance with the same diameter as the cavity 2 is inserted into the inner surface of the cavity 2 and the mold is clamped (Fig.
(B)) After the resin is injected and the mold is opened, there is a label on the surface.
The process is performed by removing the resin container.

[0003]

[Problems to be Solved by the Invention] However, as shown in FIG. 4, the label 3 is attached to the side surface of the rectangular container .
The order, inserting the label 3 into the cavity 2 of the square
At this time, unless the label 3 is formed so as to be in close contact with the inner surface of the cavity 2 , the label 3 cannot be satisfactorily inserted into the label.

That is, when the cylindrical label 3 is inserted into the cylindrical cavity 2, the synthetic paper of the label 3 is inserted.
The elastic force of the
It works uniformly and projects along the inner surface of the cavity 2. However, the label 3 inserted in the cavity 2 of the rectangular container is
The elastic force does not work so as to be similar to the cavity 2, that is , the label 3 remains round in the square hole.
It Therefore, when the mold is clamped, that is, the core 1 is the cavity
When it is inserted into the label 2, the end of the rectangular core 1 hits the end of the rounded label 3, and the label 3 is crushed.

In order to prevent this, the label 3 is made thick and is formed in advance by making a crease in the shape of a rectangular container.
Further, it is necessary to slow down the mold clamping speed of the core 1 so that the inserted label 3 is not crushed by the core 1 during mold clamping. Therefore, the above method requires a large number of steps and requires a long process time, and thus is not suitable for so-called thin high-cycle molding for mass production with thin resin.

[0006]

In a cavity mold for injection molding used for label insert molding, the cavity is
A suction circuit is provided at the corner of the inner peripheral surface of the mold , and
The split die is formed, and one or both mating surfaces of the split die are formed.
A groove is formed in the peripheral edge of the surface, and a suction circuit is communicated with the groove .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG . Core 1
Is the shape of the inside of the container and is formed along the cavity 2.
It is a square convex portion having a rounded corner. The cavity 2 is a concave portion which has an outer shape of the container and which is enlarged from the core 1 with a clearance corresponding to the thickness of the resin portion. Label 3 is
It is a synthetic paper on which the contents of the container are printed . As the suction circuit 4, four pores are provided at the four corners of the cavity 2. The inner diameter of the pores is 1 mm. This pore is attached to the mouth of cavity 2 .
A total of 8 pieces will be provided near and inside . The other end of the pores are connected to a suction pump (not shown) outside the cavity 2 type.
The suction force is 3 to 5 kg with the label 3 having a thickness of about 50 μm.
/ Cm ² . However, the suction force, the suction position, and the shape of the suction port are determined depending on the shape of the molded product, the material and thickness of the label 3, and the like.

Next, a second embodiment of the present invention is shown in FIG. This
The figure shows the vicinity of the mouth of the cavity type 2 in the first embodiment.
Make a split mold from the part of the pores of
There is a step on the edge of the mold. Split mold for this cavity 2
Groove is formed on the inner peripheral edge of the cavity 2 mold by aligning
The bell 3 can be sucked from the peripheral edge. This practice
Examples are labels 3 made of relatively hard material or complicated shapes.
It is effective when applied to vessels. Also, on the mating surface of the split mold
Is kept airtight by well-known sealing means (for example, O-ring).
Has been.

[0009]

[Operation] Next, the work procedure for label insert molding of the present invention will be described. 1. A single label 3 is rolled and inserted into the cavity 2 by a robot arm. 2. The label 3 is sucked by the suction circuit and is made to follow the inner surface of the cavity 2. 3. The mold is clamped (the core 1 is inserted into the cavity 2) and injection molding is performed. 4. Open the mold and take out the product with the label inserted. A suction circuit is provided at the mouth and back of the cavity 2.
Has the effect of sticking both ends of the label 3 in close contact.
It

[0010]

[Effect] Therefore, when clamping the rectangular container,
The label 3 does not crush the label 3 and thin-cycle high-cycle molding is possible, resulting in cost reduction due to mass production effect. The effect of this embodiment is the suction position, the suction
Not affected by mouth shape. Also, the position accuracy of the label 3
Improves the label by applying the present invention even in round containers
The fluctuation of 3 reduces the defects that were several percent.
It Further, it goes without saying that the present invention can be applied to a so-called round-corner container having a round upper portion and a square bottom portion, or a container with legs.

[0011]

[Brief description of drawings]

FIG. 1A is a side sectional view of a mold according to a first embodiment of the present invention. FIG. 1B is a view on arrow AA of FIG.

FIG. 2 is an exploded perspective view of a mold according to a second embodiment of the present invention.

FIG. 3A is a cross-sectional view of a side surface of a conventional die before die clamping. FIG.3 (b) is sectional drawing of the side surface after mold clamping of the conventional metal mold | die.

FIG. 4 is a perspective view of a rectangular container in which a label 3 is label-inserted.

[Explanation of symbols]

 1 core 2 cavity 3 label 4 suction circuit

Claims (2)

[Scope of utility model registration request] 1. Injection molding used for label insert molding
In the cavity mold, each corner of the inner surface of the cavity mold
A mold for label insert molding, which is characterized in that a suction circuit is provided in the section . 2. Injection molding used for label insert molding
In the cavity mold of, the cavity mold is formed by a split mold.
Groove on one side or both sides of the mating surface of the split mold.
A label insert molding die , which is provided with a suction circuit communicating with the groove .