JPH0513725U - Multi-bag container molding die structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a multi-bag container molding die structure,
In particular, it is characterized in that the connecting portion between the bags can be sealed in the same step during hollow molding. [Structure] The multi-bag container molding die structure according to the present invention is a multi-bag container molding die in which a parison (12) is hollow-molded into a desired shape by using a pair of openable mold parts (1, 10). In the mold structure, at least a first bag cavity (2) and a second bag cavity (4) formed in the mold parts (1, 10),
A connecting cavity (3) for connecting the respective cavities (2, 4) and a cylinder (15) having a piston (14) provided in the mold part (1, 10) and configured to be able to move in and out. The piston (14) is configured to seal the connecting portion (22) of the hollow molded product (30) in the connecting cavity (3).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-bag container molding die structure, and more particularly to a novel improvement for sealing a connecting portion between bags in the same step during hollow molding.

[0002]

[Prior Art]

 In the case of hollow-molding a multi-bag container of this type which has been conventionally used, generally, a pair of mold parts 1 shown in FIG. 5 is used and a parison (extruded by an extruder (not shown)) is used. (Not shown) is hollow-molded in the first bag cavity 2, the connection cavity 3 and the second bag cavity 4 of this mold part, and the molded hollow molded product (not shown) is taken out from the mold part 1. A sealing machine was used to seal the joints of each bag of the hollow molded product to manufacture a multi-bag container.

[0003]

[Problems to be solved by the device]

 Since the conventional multi-bag container molding die structure is configured as described above, the following problems exist. That is, when the parison is placed in the mold and hollow-molded, the air supplied into the parison is guided from the cavity for the first bag to the cavity for the second bag through the coupling cavity, so that after molding, the coupling cavity is closed. Since the hollow molded product's connecting part corresponding to the above has an air hole, it is necessary to seal the hollow molded product's connecting part taken out from the mold part by a sealing machine, which requires multiple steps. As a result, production efficiency declined and it was impossible to avoid cost increases. In addition, since the resin still swells from the sealed state at this joint, the area around the boundary of the sealed joint becomes extremely thin, leaving a problem in terms of product reliability.

The present invention has been made to solve the above problems, and in particular, a multi-bag container molding die capable of sealing the connecting portion between each bag in the same process when forming a hollow shape. It is intended to provide a structure.

[0005]

[Means for Solving the Problems]

 The multi-bag container molding die structure according to the present invention is a multi-bag container molding die structure in which a parison is hollow-molded into a desired shape by using a pair of openable and closable mold portions. At least the first bag cavity and the second bag cavity, a connecting cavity for connecting the respective cavities, and a cylinder having a piston provided in the mold part and configured to be retractable. The piston is configured to seal the connecting portion of the hollow molded product in the connecting cavity.

[0006]

[Action]

 In the multi-bag container molding die structure according to the present invention, since the cylinder having the piston that can be freely moved in and out of the mold part is provided, the parison extruded from the extruder is sandwiched between the mold parts and the air is blown. When it is supplied into the parison and blow molded, multiple bags are molded along the inner wall of each bag cavity, and a connecting part is formed between the bags. By pushing, the connection is sealed and the bags are not connected. Therefore, the molding of each bag and the sealing of the connecting portion are simultaneously performed in the same molding process. That is, since the hollow molded product is sealed before being cooled and solidified in the expanded state, the change in wall thickness is reduced, the occurrence of pinholes is suppressed, and a high-quality multi-bag container can be obtained.

[0007]

【Example】

 Hereinafter, preferred embodiments of a multi-bag container molding die structure according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those of the conventional example will be described using the same reference numerals. 1 to 4 show a multi-bag container molding die structure according to the present invention. FIG. 1 is a plan view showing one mold portion, FIG. 2 is a side view of FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing the cylinder, and FIG. 4 is a side view showing the hollow molded product after the hollow molding.

In FIG. 1, reference numeral 1 denotes a second mold part 10 that is a pair of components, and a first mold part that is configured to open and close automatically. A mold composed of these mold parts 1 and 10. An extruder 13 for extruding the parison 12 is arranged at the upper position of the mold 11.

A first bag cavity 2, a connecting cavity 3 and a second bag cavity 4 are formed in each of the mold parts 1 and 10, and the first mold part 1 corresponding to the connecting cavity 3 is formed. A seal portion 16 including a cylinder 15 having a piston 14 is provided inside.

The seal portion 16 is configured as shown in FIG. 3, and the cylinder 15 is formed with a first hole 18 and a second hole 17 for supplying air or oil. The seal portion 16 is not limited to the pneumatic or hydraulic cylinder type, but may be an electromagnetic cylinder type.

The tip 14 a of the piston 14 is configured so as to project into the coupling cavity 3, and the piston 14 is supplied, for example, by supplying air pressure through the holes 17 and 18 of the cylinder 15. Can be moved in and out, and the piston 14 has a stroke L shown in FIG.

Next, in the above-mentioned configuration, first, the seal portion 16 is operated to retract the piston 14 by the stroke L, and the die portions 1 and 10 are opened. When the parison 12 is hung from 13 and the mold parts 1 and 10 are closed at the time when the parison 12 is positioned in the mold 11, the parison 12 is positioned in the cavities 2, 3 and 4.

In this state, when air is supplied into the parison 12 through a supply unit (not shown), the parison 12 is hollow-molded along the inner walls of the cavities 2, 3 and 4, and the mold is Inside 11, a hollow molded article 30 in the form of a multi-bag container having a pair of bags 20, 21, a connecting portion 22 and inlet portions 23, 24 is molded as shown in FIG.

In this case, at the same time as this molding, before the hollow molded article 30 is cooled and solidified, air pressure is sent to the seal portion 16, the piston 14 moves forward, and the tip 14a of the piston 14 moves to the connecting portion 22 ( This state before sealing has a thickness shown by the dotted line in FIG. 4), so that the connecting portion 22 is thinned by the piston 14 as shown by the solid line from the dotted line, and at the same time formed inside. The communication hole (not shown) that has been formed is crushed to seal between the bags 20 and 21.

Therefore, by performing the above-described hollow molding and sealing operation at the same time, as shown in FIG. 4, a hollow molded article 30 having a pair of bags 20 and 21 and having completed sealing is formed by one and the same operation. Obtained by the process.

In the above-described embodiment, the case of the mold 11 having the pair of bag cavities 2 and 4 for molding the pair of bags 20 and 21 has been described. Can also be configured.

[0017]

[Effect of the device]

 Since the multi-bag container molding die structure according to the present invention is configured as described above, the following effects can be obtained. In other words, since a piston that can be moved in and out of the mold is provided, it is possible to simultaneously seal the joints during hollow molding in the same process, eliminating the sealing process that was a separate process in the past and eliminating the manufacturing process. The efficiency of can be greatly improved. In addition, since the hollow molded product is sealed before being cooled and solidified in a swelled state, a change in wall thickness after sealing is reduced, and a high quality hollow molded product having no problems such as pinholes can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing one mold part of a multi-bag container molding mold structure according to the present invention.

FIG. 2 is a side view of FIG.

3 is a cross-sectional view showing the cylinder of FIG.

FIG. 4 is a side view showing a hollow molded product after the hollow molding.

FIG. 5 is a side view showing one conventional mold portion for hollow molding.

[Explanation of symbols]

 1 1st metal mold part 2 1st bag cavity 3 Connection cavity 4 2nd bag cavity 10 2nd metal mold part 12 Parison 14 Piston 15 Cylinder 22 Connection part 30 Hollow molding

Claims (1)

[Scope of utility model registration request] 1. A multi-bag container molding die structure in which a parison (12) is hollow-molded into a required shape by using a pair of openable and closable mold portions (1, 10). , 10) at least a first bag cavity (2) and a second bag cavity (4), a connection cavity (3) for connecting the respective cavities (2, 4), and the mold. Cylinder having a piston (14) that is provided in the parts (1, 10) and is configured to be able to move in and out
(15), and the piston (14) is the connection cavity
(3) A multi-bag container molding die structure, characterized in that it is configured so as to seal the connecting portion (22) of the hollow molded product (30) in the inside.