JP2934233B1 - Injection mold - Google Patents

Abstract

The present invention provides an injection mold in which a label is not attached to a portion of a container where a label is not required, or a label is not attached to a portion of a container where a label is required. SOLUTION: This is an injection molding die having a core and a cavity, and having a label holding portion for holding a label at the time of molding the container on the inner peripheral surface of the cavity. Was formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a label L indicated by diagonal lines on an outer peripheral surface is attached integrally with a gap A having a uniform width formed between both ends thereof. A worn cup-like container C is used. As shown in FIG. 5, such a container C includes a core 1 and a cavity 2, and at the time of molding the container on the inner peripheral surface of the cavity 2, sucks and holds the label L by suction through the suction hole 4. It is molded by an injection molding machine equipped with a mold having a label holding section 3. The outer peripheral surface of the core 1 and the inner peripheral surface of the cavity 2 of this mold are smooth.

At the time of molding the container C, a label L is wound around the outer peripheral surface of the core 1 with the cavity 2 being opened, and after closing the mold of the cavity 2, the suction hole 4 is formed in the cavity 2. The label L is moved from the outer peripheral surface of the core 1 to the inner peripheral surface of the cavity 2 by the air suction, and is sucked. In this state, the resin is injected from the nozzle 9 of the fixed die 8 into the mold. The suction of the label L is released to form the container C in which the label L is integrally attached to the outer peripheral surface.

[0004]

By the way, in such a mold, the cavity 2 extends from the outer peripheral surface of the core 1 of the label L.
It is difficult for the label L sucked on the inner circumferential surface of the cavity to be displaced and accurately positioned on the outer circumferential surface of the container C during the movement suction of the label L to the inner circumferential surface. As shown in FIG. 6, the interval A ′ may not be parallel and may have an uneven width and may be stuck to the container C. In the container C thus formed, (1) the container C
The upper edge of the end of the label L is adhered to the portion a where the label L is unnecessary on the back surface of the flange, or (2) the label L is attached to the portion b or c where the label L is required on the outer peripheral surface of the container C. A problem such as not being worn occurs.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional injection molding die, and to attach a label to a place where a container label is unnecessary or to place a label on a place where a container label is required. An object of the present invention is to provide an injection-molding mold in which a label is not stuck.

[0006]

According to the present invention, there is provided an injection molding apparatus having a core and a cavity, and having a label holding portion on an inner peripheral surface of the cavity for sucking and holding a label during molding of a container. Claim 1 in a molding die.
The invention described in (1) is characterized in that a convex portion for preventing label movement is formed on the label holding portion.

The invention according to a second aspect is characterized in that a concave groove extending in the axial direction of the label is formed in the label holding portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment of the present invention shown in FIGS. 2 and 3, the same parts as those of the prior art are denoted by the same reference numerals, and description thereof will be omitted. I do. In this embodiment, at the portion corresponding to the distance A between both ends of the label L of the label holding portion 3 of the cavity 2, a convex portion 6 for suppressing label movement having the same width as this is provided. The protrusion 6 extends in the axial direction of the label L to substantially the same length as the label L, but may be shorter than this.

When the container C is formed by the above-described method, both ends of the label L are provided on the label holding portion 3 on the inner peripheral surface of the opened cavity 2 as shown in FIG. 6, the cavity 2 is closed with the mold, and the label L is suction-fitted into the label holding portion 3 of the cavity 2 by the suction hole 4, and is placed in the mold in the same manner as the conventional one. The resin is injected to form a container C in which the label L is integrally adhered to the outer peripheral surface. After the completion of the molding process, the suction of the label L by the cavity 2 is released, and the container C is removed from the mold. Take out.

When the container C is formed as described above, the two ends of the label L are abutted on the label holding portion 3 of the cavity 2 in a state where both ends of the label L are in contact with both side surfaces of the convex portion 6 at the time of resin injection. As a result, both ends of the label L are not displaced by the convex portions 6, and the label L is firmly held in the cavity 2 and displaced during molding while the interval A between both ends is maintained at a uniform width. Nothing. Therefore, there occurs such a phenomenon that the label L is stuck to a place where the label L of the container C is not necessary as in the above-mentioned conventional one, or the label L is not stuck to a place where the label L of the container C is necessary. Never do.

In a second embodiment of the present invention shown in FIG. 4, a groove 7 extending in the axial direction of the label L is formed in the label holding portion 3, and two grooves 7 are provided in the drawing. However, other numbers may be used. In such a case, the container C is molded in the same manner as the conventional one, but at this time, the suction from the suction hole 4 sucks the label L through the concave groove 7, so that the label L As in the first embodiment, the label L is firmly held in the cavity and is not displaced during molding, as in the first embodiment. Therefore, the phenomenon that the label L is stuck to a place where the label L of the container C is not required or the label L is not stuck to the place of the container C where the label L is required does not occur.

[0012]

As described above, the present invention relates to an injection mold having a core and a cavity, and having a label holding portion on the inner peripheral surface of the cavity for sucking and holding a label during container molding. In the invention described in (1), a convex portion for suppressing label movement is formed in the label holding portion, and in the invention described in (2), a concave groove extending in the axial direction of the label is formed in the label holding portion. The label L is firmly held in the cavity and is not displaced. Therefore, the label L is attached to a place where the label L of the container C is unnecessary, or the label L is placed at a place where the label L of the container C is needed. There is an effect that a phenomenon such as no sticking does not occur.

[Brief description of the drawings]

FIG. 1 is a front view of a container formed according to the present invention, wherein the label is indicated by hatching.

FIG. 2 is a vertical sectional front view of the first embodiment of the present invention.

FIG. 3 is a vertical sectional front view of a state where a label is mounted in the cavity.

FIG. 4 is a vertical sectional front view of a cavity according to a second embodiment of the present invention.

5 is a vertical sectional front view similar to FIG. 2 of a conventional injection mold of the same kind as the present invention.

FIG. 6 is a front view of an example of a defective conventional container similar to the present invention.

[Explanation of symbols]

 A Interval C Container L Label 1 Core 2 Cavity 3 Label Holder 4 Intake Hole 6 Convex Portion 7 Groove 8 Fixed Type 9 Nozzle

Claims (2)

(57) [Claims] 1. An injection molding die having a core and a cavity, and having a label holding portion on the inner peripheral surface of the cavity for sucking and holding a label at the time of molding a container, wherein the label holding portion has a convex portion for preventing label movement. An injection mold characterized by being formed. 2. An injection molding die having a core and a cavity, and having a label holding portion on an inner peripheral surface of the cavity for sucking and holding a label at the time of forming a container, wherein the label holding portion has a groove extending in the axial direction of the label. An injection mold characterized by forming: