JP3174853U - Resin injection structure for paper containers - Google Patents

Abstract

The present invention provides a resin injection structure for a paper container that can increase the structural strength of the paper container and reduce the defective rate for sealing the opening of the paper container.
A housing space and an upper surface are provided, and a plurality of grooves are provided at a distance from the periphery of the housing space, and the grooves are provided in a lower mold and a lower mold that penetrate from the housing space to the upper surface. The upper mold and the lower mold are provided with gates that communicate with the grooves, and are melted by the gates. The upper resin and the lower mold are provided with runners communicating with the gate, and the runner communicates with the sprue and the air vent.
[Selection] Figure 2

Description

The present invention relates to a resin injection structure for a paper container, and in particular, guides molten resin by combining a groove provided in a lower mold with an upper mold, so that the wall of the paper container is adjacent to the wall. The present invention relates to a resin injection structure for paper containers in which a plurality of support ribs are formed at the connecting portion of the upper edge surface, and the structural strength of the paper containers can be increased by the support ribs and the defective rate for sealing the opening of the paper containers can be reduced. It is.

  If a conventional paper container for a lid sealer takes on a larger rectangle, the wall will spread outward and deform, and the upper edge surface will deform upward, resulting in poor sealing quality. The reason is that the wall and the upper edge of the conventional paper container are weak and easily swayed. As a result, the conventional paper container cannot be accurately positioned in the sealing mold, and the opening of the paper container is sealed. When the film is welded, the sealing cannot be performed accurately.

The main object of the present invention is to provide a resin injection structure for a paper container that can increase the structural strength of the paper container and reduce the defective rate for sealing the opening of the paper container.

According to the resin injection structure for a paper container of the present invention, the storage space and the upper surface are provided, and a plurality of grooves are provided at a distance from the periphery of the storage space, and the grooves penetrate from the storage space to the upper surface. Mold,
An upper mold that is fitted to the lower mold, includes a protruding block, and the protruding block can be fitted into the accommodation space;
Including
The upper mold and the lower mold are provided with a gate communicating with the groove, and the molten resin can flow into the groove by the gate, and the upper mold and the lower mold have runners communicating with the gate. And the runner communicates with the sprue and the air vent.

According to the resin injection structure for a paper container of the present invention, the upper mold and the lower mold are connected to a heating device, and the upper mold and the lower mold are held at a constant temperature by the heating device.

According to the resin injection structure for a paper container of the present invention, the shape of the groove is preferably a triangle inclined at 45 degrees.

According to the resin injection structure for a paper container of the present invention, it is possible to increase the structural strength of the paper container and to reduce the defective rate for sealing the opening of the paper container.

It is a perspective view which shows the completed product of the paper container produced by one Example of this invention. It is a disassembled perspective view which shows one Example of this invention. It is a schematic diagram which shows operation of one Example of this invention. It is a schematic diagram which shows the injection molding of one Example of this invention. It is a perspective view which shows the work in progress of the paper container produced by one Example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 to FIG. 5 will be referred to. The paper container resin injection structure according to an embodiment of the present invention includes a lower mold 10 and an upper mold 20. The lower mold 10 includes an accommodation space 11 and an upper surface 12. A plurality of grooves 13 are provided at a distance from the periphery of the accommodation space 11. The shape of the groove 13 is preferably a triangle inclined at 45 degrees. The groove 13 penetrates from the accommodation space 11 to the upper surface 12. The upper mold 20 is aligned with the lower mold 10 and includes a protruding block 21. The protruding block 21 can be fitted into the accommodation space 11. The shapes of the accommodation space 11 and the protruding block 21 correspond to the shape of the paper container 3. The upper mold 20 and the lower mold 10 are provided with gates 14 and 24 communicating with the groove 13. The melted resin can flow into the groove 13 by the gates 14 and 24. The upper mold 20 and the lower mold 10 are provided with runners 15 and 25 communicating with the gates 14 and 24, respectively. The runners 15 and 25 communicate with the sprues 16 and 26 and the air vents 17 and 27. The upper mold 20 and the lower mold 10 are connected to a heating device (not shown). The upper mold 20 and the lower mold 10 are maintained at a constant temperature by the heating device.

The accommodation space 11 can accommodate the paper container 3. A wall 31 and an upper edge surface 32 are provided on the four circumferences of the paper container 3. During the mold matching, the wall 31 and the upper edge surface 32 of the paper container 3 are in close contact with the accommodation space 11 and the upper surface 12 respectively. When the molten resin is injected from the sprues 16 and 26 into the upper mold 20 and the lower mold 10 by the injection molding machine, the upper mold 20 and the lower mold 10 are fixed by the heating device. Since the temperature is maintained, the resin uniformly fills the runners 15 and 25, the gates 14 and 24, and the grooves 13. Air in the groove 13 is discharged from the air vents 17 and 27. Since the resin in the groove 13 comes into contact with the opposite surface of the wall 31 and the upper edge surface 32 of the paper container 3, when the resin cools and is removed from the mold, the wall 31 and the upper edge surface 32 of the paper container 3 A plurality of support ribs 33 are formed on the opposite surface. In this way, the structural strength of the paper container 3 can be increased, and the defect rate for sealing the opening of the paper container 3 can be reduced.

Thus, although the present invention has been described with reference to specific examples, the examples are for illustrative purposes only, and are not intended to limit the invention and have ordinary knowledge in the art. Those skilled in the art will recognize that changes, additions, or deletions may be made to the embodiments disclosed herein without departing from the spirit of the invention and the scope of the utility model registration claims.

  The present invention can be applied to a paper container.

3: Paper container 10: Lower mold 11: Storage space 12: Upper surface 13: Groove 14: Gate 15: Runner 16: Sprue 17: Air vent 20: Upper mold 21: Protruding block 24: Gate 25: Runner 26: Sprue 27: Air vent 31: Wall 32: Upper edge surface 33: Support rib

Claims (3)

A lower die that penetrates from the receiving space to the upper surface; and a plurality of grooves are provided at a distance on the periphery of the receiving space.
An upper mold that is fitted to the lower mold, includes a protruding block, and the protruding block can be fitted into the accommodating space;
Including
The upper mold and the lower mold are provided with a gate communicating with the groove, and the gate allows the molten resin to flow into the groove, and the upper mold and the lower mold are connected to each other. Is provided with a runner that communicates with the gate, and the runner communicates with a sprue and an air vent.   The paper according to claim 1, wherein the upper mold and the lower mold are connected to a heating device, and the upper mold and the lower mold are held at a constant temperature by the heating device. Resin injection structure for containers. The resin injecting structure for a paper container according to claim 1, wherein the shape of the groove is preferably a triangle inclined at 45 degrees.

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