JP3977012B2 - Container with undercut and blow mold suitable for molding the container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container with an undercut and a blow mold suitable for molding the container. The container is filled with beverages, cosmetics, detergents, etc. It is intended to make a significant differentiation from other containers.
[0002]
[Prior art]
In recent years, most of containers filled with beverages, cosmetics, kitchen detergents, etc. are made of synthetic resin, and the direct blow molding method or the injection blow molding method is adopted for the molding. Yes.
[0003]
Such a container made of synthetic resin has a mouth part for taking out the contents at the upper part in an upright posture of the container, and is usually a bottle shape as an outer shape, only the outer shape of the container Therefore, it is difficult to distinguish from other containers.
[0004]
In order to differentiate from other products, conventionally, characters, figures, colors, etc. are printed directly on the outer surface of the container, or a pre-decorated label is attached to the body of the container. Yes.
[0005]
By the way, when an in-mold label is used as a label for decorating a container, there is a problem that the label is displaced in the mold during molding of the article, or the label is wrinkled by residual air in the mold.
[0006]
In addition, many shrink-type labels that are attached so as to surround the outer periphery after the container is molded are also used, but this type of label requires a separate process for attaching the label, and the production cost In this case, since the mounting styles are almost the same, the product must be differentiated only by the difference in the label design, which is not an effective means. .
[0007]
On the other hand, it is conceivable to provide a bellows-like, pulse-like or wavy undercut on the body of the container to give an identification function to the external shape of the container itself to differentiate it from other products. In a container having a peculiar appearance shape, a split mold is designed so that no parting line is formed on the outer surface to be decorated. In some cases, it is impossible to set the appearance of the molded product freely.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to propose a container that can be differentiated from other containers by the appearance shape itself, and a blow mold suitable for molding the container.
[0009]
[Means for Solving the Problems]
The present invention is a container main body filled with contents, and a container having a mouth part that is integrally formed with the container main body and performs filling and discharging of the contents,
At least one part of the body of the container body has an undercut that gives an external shape that is locally recessed toward the inside of the container, and the undercut forms a mold cavity by combining at least two blocks. In the mold having a split mold structure , a slide core is disposed so as to be movable toward and away from each other along a slide surface provided on an opposing surface of the block that contacts when the mold is clamped. And a parting line formed at the outermost edge of the undercut corresponding to the contact portion of the slide core.
[0010]
The undercut has a function of discharging the contents by bending and deforming the undercut by squeezing the decorative surface of the container formed with the undercut interposed therebetween, or The thing for decorating a trunk | drum is preferable.
[0011]
Furthermore, the present invention is a mold having a split mold structure in which a mold cavity is formed by combining at least two blocks,
The mold includes a slide core that forms a part of a mold cavity together with a block, forms an undercut in at least one portion of a body portion of a molded article, and forms a parting line at a contact portion with the block,
The blow mold is characterized in that the slide core is cantilevered and supported by one of the blocks forming the mold cavity.
[0013]
In the present invention, undercut is defined as a case where the body of the container is locally recessed toward the inside of the container, and a plurality of them are arranged at intervals to form a bellows shape or a pulse The outer shape of the container is formed by exhibiting a shape and a wave shape.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A peculiar appearance shape which forms an undercut in the body part of a container and makes remarkable distinction from other containers is formed, avoiding a parting line which has a bad influence when printing for decoration.
[0015]
As for the mold, an undercut is formed in the body portion of the container at the time of blow molding, and a slide core that guides easy mold opening is separately provided to form a mold cavity in combination with a block.
[0016]
【Example】
Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 shows the external appearance of a container according to the present invention having an undercut on both sides and a curved surface sandwiching the undercut on both sides as a decorative surface (outer surface). In the figure, reference numeral 1 denotes a container body filled with contents. This container main body 1 can print characters, figures, etc. on the curved surface 1a as a decorative surface. Reference numeral 2 denotes a mouth portion that is integrally formed with the container main body 1 and performs filling and discharging of the contents. In this example, a screw-fastened cap 3 is attached.
[0017]
Reference numeral 4 denotes an undercut formed on the side surface of the body portion of the container body 1 over the entire length in the longitudinal direction. The undercut 4 gives a unique appearance.
[0018]
FIG. 2 is a plan view showing a blow mold for molding the container shown in FIG. In the figure, 5 is a mold having a split mold structure. The mold 5 includes a block 5a and a block 5b, and a slide core 6 is incorporated in the mold 5 respectively.
[0019]
The slide core 6 has a convex shape at its tip and forms an undercut of the container at the time of blow molding. In this example, the slide core 6 is cantilevered by the block 5b. Although the configuration is not shown, the slide cores 6 can move toward and away from each other along slide surfaces s provided in the blocks 5a and 5b.
[0020]
In order to perform blow molding using such a mold 5, first, the block 5a and the block 5b are brought into contact with each other, mold clamping is performed, and the slide core 6 is moved in a direction close to each other to move the blocks 5a, 5b and the slide core 6 together. After forming a mold cavity C for molding the container, a parison is placed in the cavity C and blow molding is performed according to a conventional method.
[0021]
In order to perform the mold opening after finishing the blow molding, the slide core 6 is moved in the direction away from each other in the mold 5, and then the block 5a and the block 5b are separated as shown in FIG.
[0022]
The mold 5 according to the present invention can be formed by moving the slide core 6 backward so that the mold can be easily opened even when forming a container having a unique shape having a large undercut 4 at the body of the container. Various types of containers can be blow-molded without being restricted by the appearance of the container to be used. In addition, since the parting line is formed at the contact portion between the blocks 5a and 5b and the slide core 6, a decorative surface can be reliably secured.
[0023]
4 and 5 show another example of a container with an undercut according to the present invention. When such a container is blow-molded, a slide core having a tip shape that fits the undercut may be applied.
[0024]
Further, the slide core 6 does not necessarily have to be provided on both sides of the mold, and depending on the shape of the container, the mold 5 having the configuration shown in FIG. 6 can be used. In this case, one slide core 6 is provided. That's enough.
[0025]
The undercut 4 shown in FIG. 1 can be a squeeze-type container in which the thickness of the portion is reduced and the decorative surface 1a sandwiching it is pressed to discharge the contents. The cut 4 can be bellows, pulse or wave.
[0026]
The slide core 6 can be moved by applying a normal drive mechanism such as a link mechanism or a screw mechanism, and is not particularly limited in the present invention.
[0027]
【The invention's effect】
According to the present invention, it is possible to impart various appearance shapes to the container by undercut without causing any harmful effects during parting line or mold opening,
It is possible to achieve a clear differentiation from other containers.
[Brief description of the drawings]
FIG. 1 is a diagram showing the external shape of a container according to the present invention.
FIG. 2 is a view showing a plane of a mold suitable for blow molding of the container shown in FIG. 1;
3 is a view showing a mold open state of the mold shown in FIG. 2; FIG.
FIG. 4 shows another example of a container according to the present invention.
FIG. 5 shows another example of a container according to the present invention.
6 is a view showing a plane of a mold suitable for molding the container shown in FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container body 1a Decoration surface 2 Mouth part 3 Cap 4 Undercut 5 Mold 5a Block 5b Block 6 Slide core s Slide surface C Mold cavity

Claims (3)

A container body that is filled with contents, and a container that is integrally formed with the container body and has a mouth for filling and discharging the contents,
At least one part of the body of the container body has an undercut that gives an external shape that is locally recessed toward the inside of the container, and the undercut forms a mold cavity by combining at least two blocks. In the mold having a split mold structure , a slide core is disposed so as to be movable toward and away from each other along a slide surface provided on an opposing surface of the block that contacts when the mold is clamped. And a parting line formed at the outermost edge of the undercut corresponding to the contact portion of the slide core.   The container has an undercut that gives an external shape that is locally recessed toward the inside of the container at least at one location of the body of the container body, and the container is formed with the undercut interposed therebetween. 2. The container with an undercut according to claim 1, wherein the undercut is bent and deformed by squeezing the decorative surface of the container to discharge the contents. A mold having a split mold structure in which at least two blocks are combined to form a mold cavity,
The mold includes a slide core that forms a part of a mold cavity together with a block, forms an undercut in at least one portion of a body portion of a molded article, and forms a parting line at a contact portion with the block,
A blow mold, wherein the slide core is cantilevered and supported by one of blocks forming a mold cavity.

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