JPS6251426A - Double walled multiple mouthed blow molded part and manufacture thereof - Google Patents

Abstract

PURPOSE:To easily manufacture a multiple mouthed blow-molded part in a single molding process by a method wherein a plurality of cores and cavities are respectively used so as to independently inject synthetic resins from the cavities and high pressure air is blasted in parisons, which are produced by being independently injected in parallel, so as to expand the parisons in order to closely contact with each other at the middle of both the parisons. CONSTITUTION:Synthetic resin is injected through runners 8 into gaps 5 and 6 under the conditions that two cores 2 and two cavities 3 are respectively heated to a certain temperature and split molds 1 are cooled. In this case, the resins filled in the gaps 6 produce the side walls 10, which have thread-shaped beads corresponding to the grooves 7, while the resins filled in the parison gaps 5 are kept in heated state and formed in parisons 11, which do not solidify and are held at the temperature, at which the blow molding is possible. After that, the cavities 3 are dismounted and, in exchange, a cooled blow cavity bottom force 12 is inserted in the bottom of the split molds 1, and then, high pressure air is blasted through the respective air blowing-in ports 9 of the two cores 2 so as to stretch the parisons 11 by expanding in order to closely contact the parison 11 with the inner surfaces of the side walls and of the bottom force 12.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an injection blow bottle having a plurality of openings made of synthetic resin, and a blow molded product thereof.

<Prior art> Conventionally, in order to manufacture a blow molded product with multiple mouths from synthetic resin, a plurality of bottles a and b, which have been separately molded in advance, are placed in a predetermined mold, as shown in Fig. 7. A plurality of bottles a and b can be integrally connected by inserting the support frame C and the bottom plate d around the support frame C and the bottom plate d, respectively, or as shown in FIG. A bottom plate d was attached to the lower end of a connecting frame e of a plurality of bottles r1g integrally connected via a connecting frame e.

<Problems to be solved by the invention> However, all of these devices are complicated and difficult to work with because they are constructed by combining multiple parts, resulting in high costs and problems when used for a long period of time. However, there were drawbacks such as peeling of the bonded parts.

The present invention fundamentally improves these conventional drawbacks, and in particular uses a plurality of cores and cavities, and combines special molds corresponding to these cores.
A method and molding method that makes it possible to mold a plurality of independent bottle containers into a blow-molded product having a plurality of mutually adjacent mouths integrally and in one piece by blow-molding after injection molding. It is related to goods.

<Means for Solving the Problems> The present invention involves inserting a plurality of cores from the upper part of a split mold and a plurality of cavities from the lower part, and creating a parison space between these cores and cavities. At the same time, an outer surface forming gap communicating with the parison gap is formed between the split mold and the cavity, and the core and cavity are heated to a constant temperature and the split mold is cooled to close the parison gap. Then, a synthetic resin is injected into the surface forming cavity to form the parison and the outer surface wall of the molded product on the outside thereof, and then a cooled blow cavity bottom mold of a predetermined shape is inserted from the bottom of the split mold in place of the cavity. and blowing high-pressure air into each of the plurality of parisons so that the parisons are stretched and brought into close contact with the inner surface of the bottom mold, thereby forming a plurality of containers integrally adjacent to each other. Manufacturing method and molded product.

As described above, the method according to the present invention uses a plurality of cores and cavities, injects synthetic resin separately from these cavities, and further injects the parisons injected separately in parallel. is inflated by blowing high-pressure air to bring both parisons into close contact with each other in the center, thereby making it possible to manufacture a plurality of containers that are brought into close contact with each other integrally and by the same process.

<Embodiment> One means according to the present invention for solving the above problems will be explained with reference to the drawings. As shown in FIG. The injection mold 4 is configured such that two cavities 3 can be inserted at predetermined intervals. Further, a parison gap 5 is formed between the core 2 and the cavity 3 or between two cavities 3, and a gap 6 for forming the outer surface of the molded product is formed outside the gap 5. The inner surface of the split mold 1, which is formed between the split mold 1 and the two cavities 3 in a continuous manner and forms the outer surface forming gap 6, has a screw-shaped groove 7 in which a screw can be formed. It is perforated. Further, in the drawing, numeral 8 indicates a resin injection runner provided in each of the two cavities 3, and 9 indicates an air blowing port provided in each of the two cores 2.

Next, to explain the case of blow molding using the mold 4 configured as described above, the two cores 2 and cavities 3 are heated to a constant temperature, and the split mold 1 is cooled, and then the runners 8 are Synthetic resin is injected into the gaps 5 and 6. At this time, the resin filled in the void 6 flows into the groove 7 formed in the wall of the split mold 1 due to the filling pressure, and is then cooled and solidified to form a screw-shaped protrusion corresponding to the groove 7. However, the resin filled in the parison gap 5 is maintained in a heated state, and is molded into a parison 11 maintained at a blowable temperature without solidifying.

Next, as shown in FIG. 2, remove the cavity 3 by rotating or sliding it, replace it with the cooled blow cavity bottom mold 12, and insert it into the lower part of the split mold 1. High-pressure air is blown into the parisons 11 from the respective air blowing ports 9 of 2, and the two parisons 11, which are paralleled on the left and right and are held so as to be blowable, are expanded and stretched like balloons, thereby blowing the inner surfaces of the side walls 10 and The parisons 11 injected from separate cavities 3 are brought into close contact with the inner surface of the bottom mold 12, and are then cooled and solidified to form a mold having two openings and a double shoulder and side wall. A blow molded product 13 is formed.

Next, the molded product 13 formed as described above is released from the split mold 1 as shown in FIGS. A double-walled blow-molded product 13 as shown in FIG. 5 having a mouth can be obtained.

In the above embodiment, the blow-molded product 1 has two separate containers integrally adjacent to each other.
Although the manufacturing method of No. 3 and the structure of the molded product have been explained, the blow molded product 14, which has three integrally adjacent mouths of three containers as shown in FIG. 6, can also be produced by simply changing the mold. They can be manufactured using the same process.

Furthermore, this blow molded product 14 has a brush as shown in the figure.

It is also possible to integrally form a storage recess 15 in which tools such as a spatula can be stored.

Furthermore, the parison gaps 5 between the cavities 3 in the above embodiment can be omitted.

In this case, the parallel parisons 11 are joined together during expansion.

<Effects of the Invention> Since the method according to the present invention has the structure and operation as described above, by using a plurality of cores and cavities, individually independent bottle containers can be integrated into multiple adjacent bottle containers. A blow-molded product with a mouth can be easily and reliably produced in a single process, and multi-colored containers such as two or three colors can also be produced by using synthetic resins of different brown colors.

Further, as described above, the present invention forms the parison during resin injection and simultaneously injection molds the outer surface of the molded product on the outside of the parison, so that the pattern can be clearly transferred to the formed outer surface at the same time as the resin is injected. It is possible to create fine patterns on the surface of the blow molded product, which were impossible with conventional blow molding, and because the shoulders and side walls of the molded product are not formed by parison blow molding as in the past, the inner surface of the shoulder The overhang of the parison can be prevented by controlling the wall thickness at the time of molding the parison.Furthermore, compared to the conventional insert blow molding method in which the outer wall is split and molded and molded by inserting it into a blow mold, the present invention Since all molds are integrally molded at the same time, the process is simple and the cost is low. Furthermore, since the molded product according to the present invention has a double structure in the shoulder and side walls, it has stronger impact strength than conventional molded products, and moreover, the plurality of bottle containers are integrally constructed as one part. It has the characteristics that there is no fear of mutual peeling and that it can be used for a long time.

[Brief explanation of the drawing]

Figures 1 to 5 are explanatory diagrams of the blow molding method according to the present invention, Figure 6 is an explanatory diagram showing another embodiment, and Figures 7 and 8 are
The figure is an explanatory diagram of a conventional blow molding method. a, b, f, g are bottles, c, e are frames, d is bottom plate, 1 is split mold, 2 is core, 3 is cavity, 4 is injection mold, 5 is void for parison, 6 is surface formation air gap,
8 is a runner, 9 is an air blowing port, and 13 and 14 are molded products. Figure 1 Figure 3 ↓ Figure 4 Figure 5 Figure 7 Figure 8

Claims (2)

[Claims] (1) Insert multiple cores from the top of the split mold and multiple cavities from the bottom to form a parison space between the cores and the cavities, and also insert the spaces between the split mold and the cavities. In between, an outer surface forming void communicating with the parison void is formed, the core and cavity are heated to a constant temperature, the split mold is cooled, and a synthetic resin is injected into the parison void and the surface forming void. Then, a parison and an outer surface wall of the molded product are formed on the outside of the parison, and then a cooled blow cavity bottom mold of a predetermined shape is inserted from the lower part of the split mold in place of the cavity, and a blow cavity bottom mold of a predetermined shape is inserted into each of the plurality of parisons. A method for manufacturing a double-walled multi-mouth blow molded product comprising a plurality of bottle containers integrally adjacent to each other by blowing high-pressure air into the parison to stretch and adhere it to the inner surface of the bottom mold. (2) In a blow-molded product consisting of a mouth, a shoulder, a side wall, and a bottom, a plurality of parisons arranged in parallel inside the shoulder and side walls are expanded and stretched to form an inner wall surface. A double-walled multi-mouth blow molded product characterized by integrally adjoining bottle containers.