JPS608933B2 - Composite container molding method and its mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for molding a composite container in which a blank in which a wall plate is partially connected to a bottom plate is sandwiched between male and female molds, and a synthetic resin is injected between the edges of the blank to join the edges together. and its mold.

Composite containers, which are generally made by injecting synthetic resin and bonding plank edge greens together, can be filled with liquids, powders, viscous substances, or bulk materials, and in particular can be filled with heated germs, which was said to be difficult with conventional paper containers. Room-temperature distribution is also possible depending on the material composition, and since the edge of the paper is not exposed on the inner surface of the container, there is no need for special edge treatment to prevent contents from penetrating, and the sealing surface of the lid material on the open end of the container is not required. Because it is injection molded, it has a stable shape and a strong seal.

The manufacturing method for such containers is to first print on a base paper, then laminate the surface, then punch out a blank to match the shape of the container, feed it to an injection mold, and make male and female molds. Synthetic resin is injected into the mold hole, which is made up of a sandwiched blank and a mold, and molded, and then the product is removed from the mold.

To explain this specifically, in Fig. 1, the plank is made of a single layer or a composite layer sheet of paper, synthetic resin sheet, metal foil, etc., and the connecting part 3, 3, the wall plates 4, 4 are divided into two parts and connected to each other.

Further, two other opposing edges of the bottom plate 2 are formed with notches 2a, 2a to which nozzles are to be opposed in order to inject plastic.

When a container is molded using an injection mold using the blank 1 as described above, a finished product as shown in FIG. 6
7 shows the synthetic resin of the sealing part between the wall panels, and 7 shows the synthetic resin of the green part.

Then, in mold molding, the blank 1 is sucked onto the bottom plate 2 by the vacuum hole 10 of the male mold 9 as shown in FIG.
, 3, the wall plates 4, 4 are bent and then inserted into the mold, and the split female molds 8, 8 are closed to form the blank 1 into the mold shape and mold the synthetic resin. By injecting the plank, the edges of the plank are joined together to produce a composite container as shown in FIG.

By the way, in the process of adsorbing the bottom plate 2 of this blank 1 to the male mold 9, bending the connecting parts 3, 3 with a bending device built into the blank supply device, inserting it into the mold, and clamping the mold, the bottom part becomes circular. In the case of the container, the connecting part 3,
Since it is difficult to make the width of the plate 3 wide, the wall plates 4, 4 after bending become very unstable, and it is difficult to accurately position the end green of the plank in the resin flow path of the male mold.

That is, when the plank is attracted to the male mold 9 as shown in FIG. 4, the plank wall plates 4, 4 tend to shift in the direction of the arrow shown.

Figure 5 shows the blank edge being molded in the correct position, Figure 6 shows the wallboard being bent and the edges of the blank are spaced too far apart, and Figure 7 shows the edge of the blank being molded. This shows a case where the green spaces are too narrow and overlap, and generally the phenomenon shown in FIGS. 6 and 7 occurs.

If the blank wall plates 4, 4 are not positioned correctly with respect to the male mold 9, the blank will be sandwiched between the female mold parting surfaces, causing burrs to appear or damaging the mold. There are drawbacks.

Therefore, in the present invention, guide pins for regulating the blank wall plate are provided on the female mold parting surface of the split mold so that the blank can be set in the correct position. The following description will be made based on the embodiments of the present invention shown in FIGS. 8 to 11.

Guide pins 1 are inserted into the blank wall plate on the parting surfaces 12 on both sides of the mold holes 11 of the female molds 8, 8.
Receiving holes 15 and 16 into which the guide pins 13 and 14 are inserted are bored in the female mold 8 of the other party.

Now, the female molds 8 and 8 are the largest flea of the male mold 9 "a in Figure 4"
When the male mold 9 with the plank attached thereto is inserted, the blank is positioned so as to be in contact with the parting surfaces 12 of the female molds 8 and 8, and the guide pins 13 and 14 are inserted into the mating holes 15 and 16. The position of the blank wall plate 4 is regulated to the normal position by the guide pins 13 and 14 inserted into the blank wall board 4,
Phenomena as shown in FIGS. 6 and 7 do not occur, so burrs do not appear or damage the mold.

．． Note that, of course, a guide having a design other than that shown in the drawings may be provided.

In FIG. 11, reference numeral 17 denotes a hydraulic cylinder 19 for simultaneously pushing the male mold 9 and the female molds 8, 8 into the clamping mold 18, and a hydraulic cylinder 19 for pressing the female molds 8, 8 against the male mold 9.

In any case, in the process of inserting the male mold with the blank adsorbed into the split-type female mold and clamping the mold, the blank wall plate weave is precisely positioned in the resin flow path of the male mold. The present invention is characterized by a molding method for a composite container in which the mold is clamped while regulating the end of a blank wall board with a guide provided on the parting surface of the split mold so that the mold can be clamped, and the mold thereof.
This completely eliminates the instability after bending the wall plate due to the narrow inside of the connecting part of the blank, and allows the green end of the blank to be accurately positioned in the resin flow path of the male mold. It is characterized by not damaging the mold or producing burrs.

[Brief explanation of the drawing]

Fig. 1 is a developed view of the blank, Fig. 2 is a slope view of the composite container, Fig. 3 is an explanatory view showing the molding state, Fig. 4 is a slope view showing the state in which the blank is adsorbed to the male mold, 5, 6, 7
The figure is an explanatory diagram showing different bending states of the blank wall plate, No. 8
, 9, 10, and 11 are respectively an oblique view of the mold of the present invention, a cutaway bottom view at the initial stage of mold clamping, a diagram of the assembled state of the male mold and female mold showing one of the female molds opened, and a rare state of the mold. FIG. 1...Blank, 2...Bottom plate, 3...
...Connection part, 4...Wall plate, 8,8...
Female mold, 9...male die, 13, 14... guide pin, 15, 16... receiving hole. Fig. 1 Fig. 2 Fig. 3 Old man Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Leopard Fig. 10 Fig. 11

Claims (1)

[Claims] 1. A blank made of a sheet-like material in which a portion corresponding to the wall plate of the container is partially connected to a portion corresponding to the bottom plate is sandwiched between male and female molds, and the blank is synthesized between the edges of the blank. This method involves injecting resin and joining the edges of the blank with synthetic resin.The blank wall plate supplied on top of the male mold is bent from the connecting part along the male mold, and then split. In the method of injection molding by inserting the blank into the female mold of the type and tightening the split mold, when the male mold with the blank adsorbed is inserted into the female mold of the split type and the mold is clamped, the blank wall A method for molding a composite container, which comprises clamping the blank wall plate end while regulating it with a guide provided on the barting surface of the split mold so that the plate end is accurately positioned in the resin flow path of a male mold. 2. A molding die for a composite container in which a guide for regulating the end of the blank wall plate is provided on the split mold barting surface of the female mold so that the end of the blank wall plate is accurately positioned in the resin flow path of the male mold. Type.