JPS5984730A - Hollow double wall vessel and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hollow droplet container having a rib portion between an inner wall and an outer wall, and a method for manufacturing the same. .

Conventionally, a hollow double-walled container used as a document case or a case for various parts has two outer walls, an inner wall 26, and a hollow portion surrounded by the outer and inner walls, as shown in Figure 5 (b). When an item is put into the container, the inner wall deforms due to the pressure of the stored item, and the main body λ3 itself deforms, causing the mating surfaces of the main body 3 and the lid 12 to shift. It had some drawbacks. In addition, in order to prevent this deformation, it is necessary to increase the strength of the inner and outer walls, and when the contents are heavy, the wall thickness becomes particularly thick, resulting in a heavy container.

The present invention was invented in view of the above two points, and the present invention has a sliding rib portion in which the inner wall and the outer wall are connected to each other in the hollow portion in order to prevent the inner wall from being deformed due to the pressure of stored items. , a hollow double-walled container which does not undergo deformation due to the pressure exerted on the inner wall by the stored object when the stored object is put in the container through the rib portion, and a method for manufacturing the hollow double-walled container. .

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a hollow double-walled container manufactured by the method according to the present invention, and FIGS. 3 and 9 show the same. It is a figure showing a manufacturing method.

First, a hollow double-walled container according to an embodiment of the present invention will be explained.The hollow double-walled container/ is composed of a lid body λ, a main body 3, and a hinge l, and the positional relationship of these three is as follows. The hinge q is located at a position where the body and the main body 3 are hingedly connected.
When the bendable, hollow, heavy-walled container/is opened/closed, the lid body λ and the main body 3 are separated from each other about the hinge q. Lid body λ
The main body 3 is a hollow member composed of an outer wall, an inner wall 6, a rib part 7, and a hollow part g surrounded by these three,
The rib portion 7 occupies a part of the hollow portion g and extends outward (bridging between S and the inner wall B, so that the inner wall 6, the outer wall S, and the rib portion 7 are integrated and connected). The shape of the rib portion 7 is not limited to the flat plate shape shown in the embodiment, but may also be cylindrical or
A flat plate shape with some cylindrical shape added is effective.

Next, the manufacturing method of the second embodiment will be explained with reference to FIGS. 3 and 9. As shown in Fig. 3(a), the split mold/U a,
.

' Varissure /3, which is a melt of plasticized thermoplastic synthetic resin, is suspended between /2b, and the split mold /,2a
,/,! Stop the drooping of burr thread/3 at the position where it passes through the cavity surface b. This split mold /λa, /, 2b
is a cavity/S in the shape of the desired hollow double-walled container/
A hollow molding mold having //, the divided mold/, 2a, /
,! , b, a pressure contact plate /7 connected to the cylinder /da is configured to protrude into the cavity /S.

In the process of vertical F of the burr thread/3, the pressure contact plate/7 is held in the split mold without protruding into the cavity IS.

Then, as shown in Fig. 3(b), after clamping the burr thread /3 and closing the split mold /, 22L, /, 2b, the pressure contact plate /7 connected to the cylinder /g is inserted from the cavity /S. Protruding from the cavity surface of the split mold /, ja, /knob/
Depress the burr thread /3 that has contacted B into the cavity IS. The pressure contact plate /7 is made to protrude inward of the cavity until it comes into contact with the other nopallison /3, and the contact portions are welded by mutual burr thread contact. At this time, the hinge is molded by compressing the burr thread with the split molds /Ja and /b.

Next, as shown in FIG. 3(C), the pressure contact plate/7 is slid to retreat into the mold. Then, a blowing needle (not shown) is inserted into the burr thread/3, and pressurized fluid such as compressed air is sent from the blowing needle into the burr thread/3 to perform blow molding, cool it, and then mold the split mold. 7. Open 2a and /2b to take out the molded product, and remove the paris to obtain a hollow double-walled container having a rib portion in the hollow portion. During the above process, the projection plate/7
The space between the burr thread /3 and the cavity surface /B that was created when the burr thread was retracted into the mold is filled up by the burr threads contacting each other due to the expansion of the burr thread by blowing, and the burr thread/
The burr thread /3, which forms a space between the burr thread 3 and the cavity surface /l, is welded and integrated to form a plate-shaped rib portion 7.

The nozzle /3 is formed into a hollow double-walled container (formed) having an external shape corresponding to the cavity surface /B and having a rib part 7 in the hollow part g.

In the example, to form the rib portions of the bottom of the main body and the lid, the pressure contact plate was slid so as to protrude equally from the cavity surfaces of the two split molds by the distance z, but the method of sliding the pressure contact plate was However, it is also effective to make the left and right split molds protrude at different distances over which the pressure contact plate slides. The material of the pressure plate should be adjusted so that it protrudes only from one of the split molds (you can also use the sliding method of the pressure plate). Examples of materials include metals, synthetic resins, stone masonry, inorganic materials, etc. (although materials used are particularly preferred, as they have a low coefficient of thermal conductivity).

This is due to the fact that the space between the burr thread and the cavity surface created by the retreat of the pressure welding plate is filled up by the burr thread coming into contact with each other from the blowing plate, and the burr thread is welded, but this welding is completely In order to achieve 49 years old, it is necessary that the humidity of the Parison during welding does not drop below the melting temperature, but if the pressure welding plate is made of a material with a small thermal conductivity coefficient,
This is because it creates a barrier to prevent the Parisian from losing its heat.

Since the hollow double-walled container according to the present invention has a rib portion connecting the outer wall and the inner wall in the hollow portion, it will not deform even if an external force is applied to the outer wall or the inner wall, and it will not be deformed even if an external force is applied to the outer wall or the inner wall. The hollow double-walled container according to the present invention can be made thinner than the outer and inner walls, which were previously made thicker.
It is strong against external forces as described above and is lightweight. In addition, conventional hollow-wall containers have a residual ratio /J during the forming path r, and if left undisturbed after forming, deformation will occur, so after forming,
The molded product was fixed and left alone to remove residual stress. This process requires a lot of labor and space.
This severely hindered the productivity of blow molding hollow double-walled containers. However, in the hollow double-walled container according to the present invention, the flat plate portions of the inner wall and outer wall, which had been deformed, are connected by a rib portion, so there is no deformation after molding, and the above-mentioned labor and space are not required. It is now possible to package and ship after molding.

On the other hand, the effect of shock-induced relaxation of the contents stored inside the container, which is an inherent feature of the hollow double-walled container, can be further improved by providing rib portions on the outer and inner walls of the hollow portion as in the present invention. I can do it.

In the manufacturing method according to the present invention, the pressure contact plate is placed in the split mold again and then blow molded, so that molding can be performed without leaving any depressions on both the outer wall and the inner wall.

The hollow double-walled container thus formed can have increased strength without compromising its appearance, and the inner wall can form a concave recess to accommodate the stored articles.

However, in the conventional manufacturing method, when a container is provided with ribs, it impairs the appearance of the container and the storage characteristics of the article, and there is even a rib on the side wall of the container that impairs the appearance of the container due to the mold coming out. I couldn't. However, according to the present invention, since the pressure contact plate is returned into the mold before blow molding, there is no problem with the mold coming out, and a reinforcing rib portion can also be provided on the side wall of the container.

As described above, when blow molding a hollow double-walled container made of synthetic resin, a part of the parison is recessed and welded using a slidable pressure plate, and after the welding is completed, the pressure plate is placed in the mold. Since it is a molding method in which blow molding is performed by blowing the container back inside, it has the advantage that ribs can be formed in various parts of the container without leaving any dents on the outer or inner walls. , strong against residual stress (, can simplify the processing process and increase productivity). On the other hand, according to the present invention, the hollow wall container
It has the features of not deforming due to external forces and being lightweight.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a hollow at-wall container according to an embodiment &5 of the present invention, FIG. (b) is a cross-sectional view of seven parts of a conventional hollow double-walled container, Figures 3 (a), (b) and (
C) is a cross-sectional view of a mold showing a manufacturing method according to an embodiment of the present invention, FIG. /Hollow double-walled container λ lid body 3 Main body S Outer wall B Inner wall 7 Rib part g Hollow part /7 Pressure contact plate 4 Patent applicant Kyoraku Co., Ltd. ) 12- Figure 3 (b) (C)

Claims (1)

[Claims] l A hollow double-walled container having a hollow part between an inner wall and an outer wall formed by blow molding a thermoplastic synthetic resin, in which the outer wall and the inner wall are integrated in a part of the hollow part. A hollow double-walled container characterized by continuous rib portions. λ A parison is hung between split molds whose cavities have the external shape of the desired hollow double-walled container, and then the split molds are closed to sandwich the barison and pressurized fluid is blown into the parison. In the method for manufacturing a double-walled container, before or after the parison contacts the split mold, a slidable F11 plate is protruded from the cavity surface of the split mold, and the barison is gathered by the tip of the L1 contact plate. A hollow double-walled container characterized in that the recessed part of the parison is brought into contact with the other part of the parison and welded, and then the pressure plate is slid up to the cavity surface and retreated to perform blow molding. Production method.