JPH0421569B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a method for molding the head of a tube container made of thermoplastic synthetic resin. More specifically, the present invention relates to a method for molding the head of a tube container made of thermoplastic synthetic resin. The purpose of this is to eliminate the occurrence of scraps of resin material in the mold device section consisting of.

As a method for forming the head of a tube container made of synthetic resin, as shown in Figs.
A head body sheet, which forms the head of a tube container using a rubber pad 3 and a cutter 4, is made into a flat circle from a freshly formed thermoplastic synthetic resin sheet S which is extruded from the mold and is conveyed as it is by the conveyor belt 2. The head element sheet is punched and formed into a plate shape, and this head element sheet is integrally welded to one end of a sleeve that has been previously formed into a cylindrical shape.The combination of this sleeve and the head element sheet is used as the main body part of the tube container forming apparatus. It is assembled into a mold device part consisting of a core mold and a cavity mold, and compression molding is performed using the core mold and cavity mold.
A method was adopted in which a head element sheet was molded onto the head of the tube container.

That is, a flat disk-shaped sheet piece is punched and formed from the band-shaped sheet S, and this punched-out flat disk-shaped sheet piece is used as a head element sheet. In particular, the sheet S has a pull-out hole S1, which is the mark left when the head body sheet was pulled out, as shown in FIG.
However, the sheet S that has become a scrap sheet is generally used as a recycled material as it is.

This conventional method for molding the head of a tube container has the following advantages: the molding operation is simple, and the amount of synthetic resin material for molding the head of the tube container can be set extremely easily and accurately. It is widely used due to its advantages such as being able to obtain a more beautiful product, but when forming the head from the head material sheet, it is necessary to form the opening at the mouth. In order to remove the resin material that had been removed, this removed resin material becomes scrap of the resin material in the mold device part, which is the main body part of the tube container molding device, which consists of a core mold and a cavity mold. There was a serious drawback in that it required a great deal of labor and time to remove the scraped resin material from within the apparatus.

In other words, in a conventional tube container head molding device consisting of a core mold and a cavity mold, the resin piece cut out to form the opening in the head is naturally removed from the device. However, in order to remove these resin pieces, a specialized device is required to remove the resin pieces that adhere to the tip of the core mold out of the equipment when the mold is opened. In addition, various inconveniences and drawbacks arise in terms of equipment, operation, and operation, such as the need for special means to securely attach the resin piece to the tip of the core mold.

Further, in this conventional method for forming the head of a tube container, the opening shape of the mouth portion that can be formed is limited to a circular shape, and it is completely impossible to freely set the opening shape.

The present invention was devised to eliminate the drawbacks, inconveniences, and dissatisfaction of the conventional examples described above. A sheet was formed, and the head of the tube container was formed from this head body sheet.

Embodiments of the present invention will be described below with reference to the drawings.

The method for forming the head of a tube container made of thermoplastic synthetic resin according to the present invention is to punch a sheet S made of thermoplastic synthetic resin extruded from a die 1 with a hole S2 having a small diameter in the center. A head body sheet HS for forming the head part H of the tube container T is integrally welded to one end of a cylindrical sleeve 14 made of thermoplastic synthetic resin with one end of the sleeve 14 closed. The sleeve 14 and the head body sheet HS are integrated into a core mold 9 and a cavity mold 1 for forming tube containers.
2, and the mouth core metal part 11 protruding from the front end surface of the mouth tube core metal part 10 formed at the tip of this core mold 9 is inserted into the mouth hole S2 of the head body sheet HS. The head body sheet HS is compression-molded into the head H of the tube container T by the core mold 9 and the cavity mold 12 in the inserted state.

In the case of the embodiment shown in FIGS. 3 and 4, the sheet S extruded from the die 1 is provided with small diameters at preset intervals by the first cutter 7 and the first rubber pad 5. A hole S2 is formed by punching, and then a second hole S2, which is the same as the conventional cutter 4, is formed around this hole S2.
The head body sheet HS is punched and formed using the cutter 8 and the second rubber pad 6.

That is, as shown in FIG.
When it moves to a position opposite to the second cutter 8, the second cutter 8 punches out the head body sheet HS to form a punching hole S1.

Therefore, the form of the scrapped sheet S itself is exactly the same as the conventional one.

The head body sheet HS punched and formed by this second cutter 8 is a heat-treated sheet that has already been separately molded before being assembled into a mold device consisting of a core mold 9 and a cavity mold 12. It is integrally welded and fixed to one end of a cylindrical sleeve 14 made of plastic synthetic resin with one end of the sleeve 14 closed.

The means for integrally welding and fixing the head body sheet HS to the sleeve 14 is not particularly limited, but from the viewpoint of operation, handling, and fixing strength, the method shown in the embodiment shown in FIG. Second
With the sleeve 14 assembled and fixed in advance on the second cutter 8, the head body sheet HS is punched out using this second cutter 8, and the head body sheet HS thus punched and formed is It is convenient to integrally weld and fix it to one end of the sleeve 14.

In other words, the head body sheet HS is
Since it is punched from a sheet S that has just been extruded from a sheet S, it has not yet fully hardened, and therefore has sufficient welding strength to the sleeve 14, which is also made of synthetic resin. The base sheet HS is punched and formed by the cutter 8 and at the same time is integrally welded to the sleeve 14 assembled to the cutter 8.

This method of integrally welding and fixing the sleeve 14 and the head body sheet HS eliminates the need to operate and set the assembled mutual posture and mutual positional relationship of the sleeve 14 and the head body sheet HS, and also for welding. Excellent effects such as no heating operation required, and furthermore, the assembly positional relationship between the sleeve 14 and the head body sheet HS is automatically set accurately by the punching and forming operation of the head body sheet HS itself. It has become a way to demonstrate this.

As described above, the combination of the head body sheet HS and the sleeve 14 formed into the structure shown in FIGS. It is assembled into a mold device consisting of.

As shown in Figure 7, the head body sheet HS
After the combination of the sleeve 14 and the sleeve 14 is assembled into the mold device, the core mold 9 is moved forward (moved downward in FIGS. 7 and 8), and the core mold 9 and the cavity mold 12 are moved forward (moved downward in FIGS. 7 and 8). As shown in FIG. 8, the head element sheet HS is compression molded into a head H.

When compression molding this head body sheet HS into the head H, first, by advancing the core mold 9,
The mouth core metal part 11 protruding from the tip surface of the mouth tube core metal part 10 of the core mold 9 fits into the mouth hole S2 of the head body sheet HS.
As the core mold 9 moves forward, the core mold 9 moves forward while passing through the head body sheet HS, and is tightly fitted into the assembly hole 13 of the cavity mold 12, and the core mold 9 and The formation of the molding space with the cavity mold 12 is temporarily completed.

When fitting and assembling the mouth core metal part 11 into the assembly hole 13, as described above, the mouth core metal part 11
penetrates through the head body sheet HS through the opening S2, so a part of the head body sheet HS is not pushed out into the assembly hole 13 outside the molding space of the head H, and the head body sheet HS is not pushed out. All of the body sheets HS are located within the molding space for head H molding.

From this state, the core mold 9 and cavity mold 12
By clamping the head body sheet HS,
It is compression molded into the head H shown in FIG. 8, and the molding of the head of the tube container is completed.

As described above, in the method for forming the head of a tube container according to the present invention, the mouth hole S is formed in the head body sheet HS in advance.
2, and when compression molding the head body sheet HS onto the head H, the opening core metal part 11 of the core mold 9 is inserted into the opening hole S2. Therefore, there is no scrap of resin material at all, which eliminates the need for special equipment, work, and time for removing scraps of resin material from the molding equipment, simplifying the equipment and simplifying the work. You can.

In addition, since compression molding of the head element sheet HS into the final head H is performed with the mouth core metal part 11 positioned in the mouth hole S2, the planar shape of the mouth core metal part 11 can be changed, for example, by By forming the tube container T into a triangle shape as shown in Figure 9 or a heart shape as shown in Figure 10, the opening shape of the opening formed in the head H of the tube container T can be shaped freely such as a triangle or a heart shape. It can be easily set up and molded.

As is clear from the above description, the method for molding the head of a tube container according to the present invention uses resin material in the mold device section consisting of a core mold for head molding and a cavity mold, which are the main body of the molding device. Since no scrap is generated, there is no need for special equipment to remove this scrap outside the mold equipment, and there is no need for work and time to remove the scrap, which is why this type of equipment The structure of the tube can be simplified, the operation can be made easier, the time and man-hours required to complete one tube can be greatly reduced, and the opening shape of the mouth of the tube can be changed freely. It can be easily set and molded, and exhibits many excellent effects such as being able to give tube containers ease of use, interest, and variety.

[Brief explanation of drawings]

1 and 2 are used to explain a conventional example, and FIG. 1 is a front view and FIG. 2 is a plan view of the seat. FIG. 3 is a front view showing one embodiment of the method of the present invention. FIG. 4 is a plan view of the sheet when the method of the present invention is carried out. 5 and 6 show a combination of a head element sheet and a sleeve formed by carrying out the method of the present invention; FIG. 5 is a plan view, and FIG.
The figure is a longitudinal sectional view. 7 and 8 are longitudinal sectional views showing the state of the head molding operation according to the method of the present invention, with FIG. 7 showing the state immediately before compression molding, and FIG.
The figure shows the state in which compression molding has been completed.
FIGS. 9 and 10 show examples of the planar shape of the mouth core metal part of the core mold used in carrying out the method of the present invention. Explanation of symbols, 1: Dice, 2: Conveyor belt,
3, 5, 6; Rubber pad, 4, 7, 8; Katsuta,
9; Core mold, 10; Mouth core part, 11; Mouth part core part, 12; Cavity mold, 13; Assembly hole,
S: sheet, HS: head body sheet, S2: mouth hole, T: tube container, H: head.

Claims (1)

[Claims] 1. A head body sheet for forming the head portion of a tube container, which is punched from an extruded thermoplastic synthetic resin sheet with a small opening in the center, is inserted into a thermoplastic synthetic resin tube. One end of the shaped sleeve is welded together with one end of the sleeve closed, and the sleeve and head element sheet are assembled into a core mold and a cavity mold for molding tube containers. and with the mouth core metal part protruding from the front end surface of the mouth tube core metal part formed at the tip of the core mold inserted into the mouth hole of the head element sheet, A method for forming a head of a tube container made of synthetic resin, comprising compression molding the head body sheet onto the head of the tube container using the core mold and the cavity mold.