JPH08164541A - Injection mold - Google Patents

Abstract

PURPOSE: To provide an injection mold for a mouth stopper fitted with a pull ring by preventing a pinhole on a thin-walled fragile line easy to generate at the time of mold opening after molding. CONSTITUTION: In an injection mold for molding a mouth stopper wherein an ejection cylinder is vertically provided on a pedestal plate and a cutting-off part having a thin-walled fragile line provided to the periphery thereof is provided to the pedestal plate inside the injection cylinder and a support provided with a pull ring is erected on a part of the cutting-off part, a pin-shaped core mold 103 is provided in the vicinity of the inside of the support of a core mold 101 forming the inside of the pull ring and, at the time of mold opening, the mold is opened in the order of the core mold 101 forming the inside of the pull ring, the core mold 102 forming the inside of the ejection cylinder from the outside of the pull ring and the pin-shaped core mold 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention pulls a pulling ring used for foods such as fruit juices, sake, mirin and other non-foods such as shampoo and fabric softener to cut and open thin weakened lines. The present invention relates to a mold for injection molding of a stopper with a pulling ring.

[0002]

2. Description of the Related Art Conventionally, a base plate (2) as shown in FIG.
And a cutout portion (5) around which the thin film weakening line (4) is provided, is provided on the pedestal plate on the inside of the discharge pipe (3).
A spigot (1) with a tension ring, in which a strut (6) to which a tension ring (7) is attached is erected on a part of the cutout, is used as a spout for food and non-food containers over a wide range of applications. Has been. In the injection molding die for molding the plug with the pulling ring, the core die forming the inside of the pouring tube is
It consists of a core mold that forms the inside of the tension ring and a core mold that forms the inside of the spout tube from the outside of the tension ring.When opening the mold after molding, first open the core mold that forms the inside of the tension ring, and then pull The core mold that formed the inside of the spout from the outside of the ring was open.

[0003]

However, when the core die forming the inside of the pouring tube is opened from the outside of the pulling ring, the outside of the pulling ring undercuts the core die (with respect to the opening / closing direction of the die). The pull ring is pulled in the opening direction of the core mold, and the column that connects with the pull ring and the cutout portion are also pulled, and the ring-shaped thin-walled weak line provided on the periphery of the cutout portion. There was a case where a pinhole was generated in the thin fragile wire due to the force applied to.

According to the present invention, when the core die forming the inside of the pouring tube is opened from the outside of the tension ring when the die is opened after molding, even if the tension ring is pulled in the opening direction of the core die,
The present invention provides a mold for injection molding of a plug with a pulling ring, which prevents a thin weak wire from being applied with force and prevents the occurrence of pinholes.

[0005]

The present invention is based on FIG. 1 or FIG.
As shown in Fig. 3, the pouring tube (3) is erected on the base plate (2),
The pedestal plate inside the pouring tube is provided with a cutout portion (5) around which the thin film weakening line (4) is provided, and a pillar (7) attached to a part of the cutout portion (5). In a mold for injection molding of a spigot (1) in which 6) is erected, a pin-shaped core mold (103) is provided in the vicinity of the inside of the support pillar (6) of the core mold (101) forming the inside of the tension ring (7). A core die (101) that is provided and forms the inside of the pulling ring when the die is opened, and a core die (10) that forms the inside of the dispensing tube from the outside of the pulling ring
2) The mold (100) for injection molding is characterized in that the mold is opened in the order of the pin-shaped core mold (103).

As shown in FIG. 1, the injection molding die is divided into a fixed plate side die (110) and a movable plate side die (120) from the die dividing surface (A), and the fixed board is fixed. Side mold (11
0) is the fixed side mounting plate (111) and several plates (1
12, 113, 114), and the sprue (11), runner (12), gate (13), etc. are internally provided in these. On the other hand, the movable plate side mold (120) includes a movable side mounting plate (121) and several plates (122, 12).
3,124,125,126) and these
The core type (101, 102,
103) and cavity molds (104, 105, etc.) are stored. In addition, the mounting plate and each plate are respectively a predetermined plate and a coupling pin (which is coupled at a constant interval), a suspension pin (which is coupled from a predetermined spacing position), and a ring (which is coupled from a predetermined spacing position). Are linked or linked by. The molten resin injected from the injection nozzle of the injection molding machine passes through the sprue (11) and the runner (12) in the mold and then passes through the gate (13).
As a result, it is injected into the cavity (14) to mold the spout.

[0007]

In the injection-molding die for the stopper with a pulling ring of the present invention, the core die forming the inside of the pulling ring is opened at the time of opening the die after molding, and then the inside of the pouring tube is opened from the outside of the pulling ring. When the core die to be formed is opened, even if the tension ring is pulled in the opening direction of the core die, the pin-shaped core die provided near the inside of the pillar of the core die forming the inside of the tension ring is still open. Since there is no pin-shaped core mold, the thin fragile wire of the pedestal plate inside the spout tube of the molded product is fixed by pressing the cutout that surrounds the pedestal plate, so no force is applied to the thin fragile wire. .

[0008]

EXAMPLE First, an injection molding die (100) of this example shown in FIG. 1 for molding the plug with a pulling ring (1) shown in FIG. 3 by an injection molding method was produced. This injection mold is
As shown in FIGS. 1 and 2, the fixed plate side mold (110)
But sprue (11), runner (12) and gate (1
3) and the like internally provided with a plate (114), a plate (113), a plate (112), and a fixed side mounting plate (1
11) and the movable plate side mold (120) is
Plate (126), plate (125), plate in which core mold (101), core mold (102), pin-shaped core mold (103) and cavity mold (104), cavity mold (104), etc. are installed (123), plate (1
22), plate (124) and movable side mounting plate (12)
1), and further, the movable side mounting plate (121) of the mold on the movable plate side and the plate (122) are joined by a joining pin (not shown) to form the plate (122) and the plate (123). ) Is connected by a hanging pin (21), and the plate (124) and the plate (125) are connected to each other by a joining pin (2).
And the plate (125) and the plate (12
6) and the plate (12)
6) and the plate (114) are connected by a ring (not shown), and the plate (122) includes a core mold (1).
01) is attached, the plate (123) is attached with the core mold (102), the plate (124) is attached with a pin-shaped core mold (103), and the plate (125) is attached with a cavity mold. (104) is attached to the plate (126) and the cavity mold (10
5) is attached.

Next, the injection molding die of this example thus produced was attached to a die mounting plate of an injection molding machine to form a plug with a tension ring. The operation of the mold opening after molding the movable plate side mold will be described in detail with reference to FIGS. 1 and 2. First, when the movable side mounting plate (121) moves, the plate connected to this movable side mounting plate. (122) moves at the same time, and the core mold (101) attached to this plate moves and opens. Further, when the plate (122) moves to a predetermined position, the a-plane of the hanging pin (21) is moved to the plate (12).
The plate (123) moves by contacting the b surface of 3),
The core mold (102) attached to this plate moves and opens. Furthermore, the e-plane of the plate (122) that moves together with the plate (123) is f of the plate (124).
The plate (124) moves in contact with the surface, and the pin-shaped core mold (103) attached to the plate moves and opens. Further, the plate (125) joined to the plate (124) moves, and the cavity mold (104) attached to the plate moves and opens. Next, when the plate (125) moves to a predetermined position, the c-plane of the hanging pin (23) contacts the d-plane of the plate (126), the plate (126) moves, and the cavity attached to this plate is moved. The mold (105) moves and opens. Further, when the plate (126) moves to a predetermined position,
The ring (not shown) moves the plate (114) of the mold on the stationary platen side toward the mold on the movable platen side, and the molded plug with the tension ring is released. The molding condition using the injection molding die of this example was good, and no pinhole was found in the thin fragile wire of the molded plug.

[0010]

EFFECTS OF THE INVENTION When the injection molding die for a stopper with a pulling ring of the present invention is used, a pin-shaped core die is provided in the vicinity of the inner side of the pillar of the core die forming the inside of the pulling ring. Since the pin-shaped core mold presses the cut-out portion around which the thin fragile wire of the pedestal plate surrounds when the is opened, pinholes are rarely generated in the thin fragile wire.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a structure of an injection molding die according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing the movement of the plate by the suspension pin of the injection molding die of the embodiment.

FIG. 3 is a sectional view of a spigot with a tension ring manufactured in an example.

[Explanation of symbols]

1 ... Mouth plug 2 ... Pedestal plate 3 ... Spout tube 4 ... Thin weak line 5 ... Cut part 6 ... Stand 7 ... Tension ring 11 ... Spru 12 ... Runner 13 ... Gate 14 ... … Cavities 21,23 …… Suspension pins 22 …… Joining pins 100 …… Injection molding dies 101,102,103 …… Core dies 104,105 …… Cavity dies 110 …… Fixing plate side dies 111 …… Fixing Side mounting plate 112, 113, 114, 122, 123, 124, 1
25, 126 ... plate 120 ... movable plate side mold 121 ... movable side mounting plate

Claims (1)

[Claims] 1. A pedestal plate is provided with a pouring tube standing upright, a pedestal plate inside the pouring tube is provided with a cutout portion around which a thin film weakening line is provided, and a pulling ring is provided on a part of the cutout portion. In an injection molding die for molding a spout with an attached support,
A pin-shaped core mold (103) is provided in the vicinity of the inner side of the pillar of the core mold (101) forming the inside of the tension ring, and when the mold is opened,
A core mold (101) forming the inside of the pulling ring, a core mold (102) forming the inside of the dispensing tube from the outside of the pulling ring,
A mold for injection molding, characterized in that the mold is opened in the order of a pin-shaped core mold (103).