JPH051129B2 - - Google Patents

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 molded with a predetermined amount of metal, as shown in Fig. 7. A plurality of bottles a and b can be integrally connected by inserting them into a mold and injection molding a support frame c and a bottom plate d around them, or as shown in FIG. As shown, a bottom plate d was attached to the lower end of a connecting frame e of a plurality of bottles f and g which had been integrally connected in advance via a connecting frame e.

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

The present invention fundamentally improves these conventional drawbacks, and in particular uses a plurality of cores and cavities, and combines a special mold that corresponds to these cores, and after injection molding. A method and a molded product that make 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. It is.

<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 to form a parison cavity between these cores and cavities. At the same time, an outer surface forming void communicating with the parison void 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 form the parison void and surface. Synthetic resin is injected into the gap to form the parison and the outer surface wall of the molded product on the outside thereof. Next, 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 the plurality of molds are cooled. A method for producing a double-walled, multi-mouth blow-molded product in which a plurality of containers are integrally formed adjacent to each other by blowing high-pressure air into each of the parisons so that the parisons are stretched and brought into close contact with the inner surface of the bottom mold, and the same. It is a molded product.

<Function> 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 to high pressure. Both parisons are inflated by blowing air into them and brought 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 as one unit and by the same process. .

<Example> 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 thereinto at predetermined intervals. A parison gap 5 is formed by 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 is formed between the split mold 1 and the two cavities 3 so as to communicate with each other, and forms the outer surface forming gap 6. A screw-shaped groove 7 in which a screw can be formed is bored on the inner surface of the split mold 1. It is set up. Further, in the drawings, 8 is a resin injection runner provided in each of the two cavities 3, and 9 is 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. Then, the synthetic resin is injected into the gaps 5 and 6. At this time, the resin filled in the void 6 is applied to the split mold 1 due to the filling pressure.
It flows into the groove 7 bored in the wall surface, and is then cooled and solidified to form the side wall 10 having a threaded protrusion corresponding to the groove 7. The heated resin is maintained in a heated state and is molded into a parison 11 that is maintained at a temperature that allows blowing without solidifying.

Next, as shown in FIG. 2, the cavity 3 was removed by rotating or sliding, and replaced with the cooled blow cavity bottom mold 12.
into the bottom of the split mold 1, then insert the two cores 2
High-pressure air is blown into the parisons 11 from the respective air blowing ports 9, and the two parisons 11, which are paralleled on the left and right and are held in a blowable manner, are inflated and stretched like balloons, thereby blowing them into the inner surface and bottom of the side wall 10. Separate cavities 3 are placed in close contact with the inner surface of the mold 12.
The injected parisons 11 are also placed adjacent to each other, and are further cooled and solidified to form a blow-molded product 13 having two openings and double shoulders and side walls.

Next, the molded product 13 formed as described above is
As shown in Figures 1 and 4, the double wall as shown in Figure 5 has two openings with screw patterns 7 clearly transferred to the outer surface of the opening after being released from the split mold 1. A blow molded product 13 can be obtained.

In the above embodiment, the method for manufacturing the blow molded product 13 having two mouths integrally adjacent to each other and the structure of the molded product were explained in the sixth embodiment. A blow-molded product 14 having three integrally adjacent containers as shown in the figure can also be manufactured by the same process by simply changing the mold.

Furthermore, as shown in the figure, this blow molded product 14 has
It is also possible to integrally form a storage recess 15 in which tools such as brushes and spatulas can be stored.

Furthermore, the parison gap 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 above-described structure and operation, by using a plurality of cores and cavities, it is possible to combine individual bottle containers into integrally adjacent ones. Multi-mouth blow molded products can be easily and reliably produced in a single process, and multi-colored containers with two or three colors can also be produced by using different colored synthetic resins. I can do it.

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 the pattern can be clearly transferred to the outer surface of the molded product at the same time as the resin is injected. This makes it possible to create fine patterns on the surface of blow-molded products that were impossible with conventional blow molding.
In addition, since the shoulders and side walls of the molded product are not formed by blow molding the parison as in the past, overhang on the inner surface of the shoulder can be prevented by controlling the wall thickness at the time of molding the parison. Compared to the insert blow molding method in which the wall portion is separately molded and then inserted into a blow mold for molding, the present invention performs simultaneous integral molding within the mold, making the process simpler and the cost lower. Furthermore, since the molded product according to the present invention has a double structure in the shoulder and side walls, it has higher impact strength than conventional molded products.
Moreover, since the plurality of bottle containers are integrally constructed from one part, there is no fear of them peeling off from each other, and the bottle containers can be used for a long time.

[Brief explanation of drawings]

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

Claims (1)

[Claims] 1. A plurality of cores are inserted into the upper part of the split mold, and a plurality of cavities are inserted into the lower part of the split mold to form a parison gap between these cores and the cavities, and the split mold and the cavities are inserted into the mold. During this step, 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 synthetic resin is injected into the parison void and the surface forming void. to form the parison and the outer surface wall of the molded product on the outside thereof, and then insert a cooled blow cavity bottom mold of a predetermined shape from the lower part of the split mold in place of the cavity,
Production of a double-walled multi-mouth blow molded product in which a plurality of bottle containers are integrally formed adjacent to each other by 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. Method. 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 to form a plurality of bottle containers. A double-walled multi-mouth blow molded product characterized by integrally adjacent parts.