JPH0335183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to hollow containers molded by blow molding, such as food containers and pharmaceutical containers.

Prior Art The above-mentioned hollow container is designed to prevent foreign matter such as dust from entering the hollow container during transportation, storage, etc.
Alternatively, to prevent the original three-dimensional shape of the hollow container from being deformed or damaged, the hollow container is sealed immediately after blow molding.

For example, in the case of a food container, after blow molding, the part near the mouth of the container into which the pressure fluid is introduced is closed by heat welding, and then when the contents are filled into the container, the closed part is cut and opened. The contents are filled from the beginning to prevent bacteria from entering the contents.

FIG. 10 shows the conventionally known hollow container (Japanese Patent Application Laid-open No. 48-23851), in which when the container body a is molded, a bulge unrelated to the product is formed in the mouth part b. At the same time, a pressure fluid injection pipe d is provided protrudingly on this bulged portion c, a blowing needle is inserted into this pressure fluid injection pipe d and blow molding is performed, and then the pressure fluid injection pipe d is The heat-sealed portion e is heat-sealed using a heating blade or the like.
When filling the contents, the cutting line f at the end of the mouth b
The bulging portion c is removed at the step to open the mouth portion b.

In the conventional hollow container described above, since the fluid blowing pipe d and the heat-sealing part e protrude from the mouth part b, when the containers come into contact with each other during transportation, this protruding part closes the body of the container. There was a problem that the surface of the product could be damaged.

In addition, in the conventional example above, the seal part is a thin tubular part, and the heat seal uses two hot plates, which clamp the heat seal part and seal it. It is extremely difficult to properly adjust the heating temperature, time, and pressing force during heat sealing, and the heat seal part e is thinned and easily cut, and the cut thin tubular part easily adheres to the heat seal part e. As a result, there have been problems such as accidents such as the contents getting mixed into the container when filling, and further problems such as the closure part created by the heat seal opening unexpectedly and contaminating the inside of the container.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems.The present invention prevents the obstruction from damaging other containers, prevents the obstruction from separating and opening at an unexpected time, and furthermore, allows the blow hole to be opened in one place. It is an object of the present invention to provide a hollow container that can be easily melted and closed from one direction using a separate heating element without deforming the bulging portion.

Structure of the Invention In a hollow container in which a hollow bulge that closes the mouth is integrally formed at the mouth of the container body, and a blow hole is provided in the bulge, the bulge is provided with a notch, A cylindrical portion is provided on one side wall of the notch, and a blow hole is opened at the top of the cylindrical portion, which is melted and closed by heating and pressing the top of the cylindrical portion after molding.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 9.

In the figure, 1 is a hollow container usually molded by a general blow molding method, 2 is the container body, 3 is a mouth part, and a bulge part 4 that is cut out when filling the contents is integrally molded into the mouth part 3. has been done.

A blow hole 5, which is a passage through which pressure fluid is introduced during blow molding, is opened at the top of the bulging portion 4, and during molding, pressure fluid is introduced through the blow hole 5 to perform blow molding. ing.

The top of the bulging portion 4 has a semi-spherical shape with a portion cut out, and a semi-cylindrical bulging tube portion 6 is provided on one side wall of the notch 4a. The above-mentioned blow hole 5 is opened at the top.

The blowing hole 5 of the hollow container 1 blow-molded into the above-mentioned shape has a bulging portion 4 as shown in FIGS. 3 and 4.
By approaching the hot plate 7 from the side notch 4a side and pressing the top of the cylindrical portion 6 toward the bulging portion 4, the cylindrical portion 6 is closed by melting and deforming.

At this time, the reaction force against the pressing of the hot plate 7 is supported by the bulging portion 4, and the cylindrical portion 6 for closing the blow hole 5 is pressed with a force sufficient to melt and deform.

The shape of the cylindrical portion 6 provided in the bulging portion 4 may be a tapered shape as shown in FIG. 2, or a right cylindrical shape as shown in FIG. 5. On the other hand, a notch 4a provided in the bulge 4
may be small as shown in Fig. 6, or may be small as shown in Fig. 7.
As shown in the figure, the bulging part 4 may be cut out from both sides, or as shown in FIG. In particular, when the cylindrical portion 6 is approximately semi-cylindrical, the portion that melts and deforms and the portion that withstands pressure are effectively arranged in halves, so that complete closure can be achieved.

Further, the blowing hole 5 does not necessarily have to be opened at the top surface of the bulge 4, but may be opened at the side surface of the bulge 4 as shown in FIG.

Further, the top of the bulging portion 4 does not necessarily have to be semicircular and may have a shape that does not have very sharp edges, such as a rectangular cylinder. Especially the cylindrical part 6
If the top of the cylindrical portion 6 is placed inward from the bulging portion 4, the top of the molten cylindrical portion 6 will not damage other containers, and the cylindrical portion 6 will not separate.

As a heating means for melting and deforming the top of the cylindrical part 6, an example other than the hot plate 7 shown in FIGS. 3 and 4 is to heat the top of the cylindrical part 6 with hot air or flame and then use a cooling plate. There is a means for applying pressure.

Effects of the Invention According to the present invention, since the top of the cylindrical portion 6 is closed, there is no cylindrical portion above the closed portion.
Therefore, the portion above the closed portion does not separate during transportation as in the prior art. Furthermore, since the blow hole 5 is provided along the bulging portion 4, the blocked portion of the blow hole 5 will not protrude, and this portion will not damage other containers. Further, since the closing portion is melted and deformed relative to the bulging portion 4, the closing portion is completely closed, and the closing portion does not open unexpectedly, so that the inside of the container is not contaminated. Furthermore, the above-mentioned blow hole 5
can be easily melted and closed from one direction using a heating element without deforming the bulged portion 4.

[Brief explanation of the drawing]

1 to 9 show embodiments of the present invention. FIG. 1 is a front view with the main parts cut away, FIG. 2 is a perspective view of the main parts, and FIGS. 3 and 4 are Action diagram,
5 to 9 are perspective views showing other examples of essential parts, and FIG. 10 is a front view showing a conventional example. 1 is a hollow container, 2 is a container body, 3 is a mouth portion, 4 is a bulging portion, 4a is a notch portion, 5 is a blow hole, and 6 is a cylinder portion.

Claims (1)

[Scope of Claims] 1. A hollow container 1 in which a hollow bulging portion 4 that closes the mouth portion 3 of the container body 2 is integrally molded, and a blowing hole 5 is provided in the bulging portion 4. A notch 4a is provided in the bulging portion 4, a cylindrical portion 6 is integrally arranged in parallel with one side wall of the notch 4a, and the top of the cylindrical portion 6 is closed after molding. A hollow container characterized in that a blowing hole 5 is opened. 2. The hollow container according to claim 1, wherein the top of the bulging portion 4 is semicircular. 3. The hollow container according to claim 1 or 2, characterized in that the blowing hole 5 is provided at the top of the bulging portion 4. 4. The hollow container according to any one of claims 1 to 3, wherein the cylindrical portion 6 is approximately semi-cylindrical. 5. The hollow container according to any one of claims 1 to 4, characterized in that the top of the cylindrical portion 6 is located inward from the bulging portion 4.