JPH10119952A - Device for manufacturing composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a synthetic resin from leaking in the vicinity of the body seamed part of a cup. SOLUTION: This manufacturing device for composite container is equipped with injection dies 31, 32 in which a cup 10 having a body seamed part is placed. The cavity in the injection dies 31, 32, has a resin forming part 41 for a flange at the location corresponding with the upper end opening rim, and a resin forming part 43 for a body seam end surface covering part at a location corresponding with the internal surface of the body seamed part. A slide body 40 which presses the body seamed part inward, is provided at a location corresponding with the external surface of the body seamed part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a composite container having a body portion and a flange portion for sealing a lid material, and for manufacturing a composite container for filling foods, desserts, prepared dishes and the like. .

[0002]

2. Description of the Related Art Conventionally, a composite container as described above has
Known is a cup having a body part and a bottom part with an open upper end, a cup made of a laminated blank material including a paper layer, and a flange part formed by injecting a synthetic resin into the periphery of the upper end opening of the cup. I have.

When manufacturing such a composite container, first, a cup made of the above-described laminated blank material is prepared.
Next, the cup is loaded into an injection mold, and thereafter, a synthetic resin is injected around the upper end opening of the cup to form a flange portion.

[0004]

By the way, the body of the cup is formed by laminating a laminated blank material, so that a body sticking portion on which the laminated blank material overlaps is formed on the body.

[0005] The body sticking portion is made of two blank materials, but the vicinity of the body sticking portion is made of one blank material, so that step portions are formed at both ends of the body sticking portion, and the injected synthetic resin is made of this blank. In some cases, the undesired portion may move from both ends of the sticking portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is a method for manufacturing a composite container capable of manufacturing a highly accurate composite container by preventing the synthetic resin from wrapping around the body sticking portion of the cup. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a cavity comprising a female mold and a male mold, having a body with a top open and a bottom, and receiving a cup made of a laminated blank containing a paper layer. The cavity has a resin molded portion for a flange portion at a position corresponding to the peripheral edge of the opening at the upper end of the cup, and the trunk portion of the cup is formed by laminating a laminated blank material with a trunk sticking portion. The cavity has a resin molded portion for covering the body sticking end surface at a position corresponding to the inner surface of the body sticking portion, and the inside of the body sticking portion is formed in a portion of the injection mold corresponding to the outer surface of the body sticking portion of the cup. A composite container manufacturing apparatus, characterized in that a slide body for pressing inward is provided movably inward.

According to the present invention, since the slide body is slidably provided inward, the body sticking portion can be pressed by the slide body. Therefore, it is possible to prevent the leakage of the injection resin in the vicinity of the body pasting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 are diagrams showing an embodiment of the present invention.

First, the composite container will be described with reference to FIGS. As shown in FIGS. 1 to 3, the composite container is a cylindrical cup 1 having a body 11 with an open upper end and a bottom 12.
0, and a flange 21 formed by injecting a synthetic resin such as polyethylene into the periphery of the upper end opening of the body 11. The flange portion 21 has a lid member (not shown).
Are heat-sealed.

The body 11 of the cup 10 is formed by laminating a laminated blank material including a paper layer at a body sticking portion 25, and the bottom portion 12 is formed of a laminated blank material also including a paper layer. The body 11 and the bottom 12 are formed separately, and are connected to each other at a bottom edge 26. The body 11 extends further below the bottom 12 and forms a string 27 located on the periphery of the bottom 12.

The synthetic resin for molding the flange portion 21 is also injected into the inner surface of the body sticking portion 25 of the body portion 11, and this body sticking portion 25 is formed.
Body pasting end surface covering portion 22 for covering the overlapping portion on the inner surface side of
Is molded. The body sticking end surface covering portion 22 is a flange portion 21
From the lower edge to the bottom edge 26.

Further, the synthetic resin for molding the flange portion 21 and the body sticking end surface covering portion 22 is also injected into the inner surface of the bottom edge portion 26 connecting the body portion 11 and the bottom portion 12, and covers the inner surface of the bottom edge portion 26. Is formed. The bottom edge covering portion 23 covers the inner surface of the bottom edge portion 26 and is connected to the body sticking end surface covering portion 22, so that the flange portion 21, the body sticking end surface covering portion 22, and the bottom edge covering portion 23 are connected to each other. Will be. In addition, the bottom edge covering part 23 is
a, an outer high surface portion 23b higher than the inner low surface portion 23a, and a step portion 23c between the inner low surface portion 23a and the outer high surface portion 23b. The stepped portion 23c allows the female mold 31 and the male mold 32 constituting an injection mold to be described later.
The air in the cavity between the two can be smoothly discharged to the outside. Further, at the desired position (1 to 5 places) in the circumferential direction of the bottom edge covering portion 23, the upper portion extends upward and, when the composite containers are stacked, the thread twist 27 of the composite container located above.
A stack rib 45 is provided in contact with the bottom surface of the stack.

Next, an apparatus for manufacturing a composite container according to the present invention will be described with reference to FIGS. As shown in FIGS. 4 to 6, the composite container manufacturing apparatus according to the present invention includes a movable female mold 31 and a fixed male mold 32, and the female mold 31 and the male mold 3 are provided.
A cavity is formed in the inside where the cup 10 is loaded between the two. In this case, the injection molds 31 and 32 are constituted by the female mold 31 and the male mold 32.

The cavities in the injection molds 31 and 32 correspond to the resin molded portion 41 for molding the flange portion 21 provided at a position corresponding to the peripheral edge of the upper end opening of the cup 10 and the inner surface of the body sticking portion 25 of the cup 10. And a resin molding portion 42 for molding the body sticking end surface covering portion 22 provided at a position to be formed, and a resin molding portion 43 for molding the bottom edge covering portion 23 provided at a position corresponding to the inner surface of the bottom edge portion 26. ing. The cavities in the injection molds 31 and 32 have a resin molding portion 45 a for molding the stack rib 45 and a cup loading space 49 for loading the cup 10.

As shown in FIG. 4, the injection molds 31, 3
The male mold 32 of the two has an injection gate 35 for injecting a synthetic resin into the resin molding portion 41 for forming a flange portion, at a portion corresponding to the inner surface near the upper end of the cup 10. Further, among the cavities, the resin molding portion 41 for forming a flange portion, the resin molding portion 42 for forming a body sticking end surface covering portion, the resin molding portion 43 for forming a bottom edge covering portion, and the resin molding portion 45a for forming a stack rib are all cups. 10 is provided inside. Therefore, when a synthetic resin is injected from the injection gate 35 into the resin molding portion 41 for molding a flange portion, the cup 10 can be pressed against the inner surface of the female mold 31,
The positional accuracy of the cup 10 in the cavity can be improved. As described above, the cup 10 is disposed in the cup loading space 49 of the cavity.
On the entire surface other than 1, 42, 43 and 45a, the female mold 31 and the male mold 32 are tightly clamped. Therefore, it is possible to prevent the synthetic resin injected from the injection gate 35 from leaking to portions other than the resin molded portions 41, 42, 43, and 45a in the cavity.

As shown in FIGS. 4 and 5, a part of the female mold 31 is notched, and a slide body 40 is slidably disposed in a notch space 40a of the female mold 31 in the radial direction. ing. The slide body 40 is arranged at a position in the cup 10 in contact with the outer surface of the body sticking portion 25 of the body portion 11, and presses the outer surface of the body sticking portion 25 against the male mold 32. In this manner, the body sticking portion 25 is
Between the injection gate 3 and the male mold 32.
5 can be prevented from flowing out from both ends of the body sticking portion 25.

That is, the body pasting portion 25 is a portion where the laminated blank material is pasted and doubled, and both ends of the body pasting portion 25 are formed of two laminated blank materials to form a step 58. Has formed. For this reason, it is considered that the synthetic resin may flow out of the step 58 of the body sticking part 25 unless the body sticking part 25 is firmly held. However, according to the present invention, the body sticking part 25 is firmly held. In addition, the outflow of the synthetic resin from the vicinity of the body sticking portion 25 can be prevented.

As described above, the slide body 40 is slidably disposed in the cutout space 40a.
0 may be supported from the female mold 31 side. The male mold 32 may be supported from the side. Further, the slide body 40 may be made of metal, or may be made of an elastic body such as silicon rubber or urethane rubber.

In FIG. 4, a vacuum circuit 38 for discharging air in the cavity to the outside is provided in the male mold 32. Further, as shown in FIG. 4, at the bottom of the female mold 31, the thread 2 is inserted inside the thread 27 of the cup 10.
7 and a cylindrical or cylindrical soft member 47 for pressing the outer peripheral surface against the female mold 31, and a driving member 4 provided at the center of the soft member 47 for pushing the soft member 47 outward in the radial direction.
8 are provided. The soft member 47 is made of urethane, silicon, Teflon, elastomer, rubber, or the like, and is freely deformable in the radial direction. Further, a pressing device is constituted by the soft member 47 and the driving member 48.

As described above, the soft member 47 is pushed and expanded by the driving member 48, and the outer peripheral surface of the thread string 27 of the cup 10 is clamped between the soft member 47 and the female mold 31. The synthetic resin does not flow around 26 and the vicinity of the twisting 27. When the synthetic resin wraps around the bottom edge 26 of the cup 10, it becomes difficult to crush the composite container at the time of disposal, but according to the present invention, such a problem does not occur.

Note that a collapsible core may be used instead of the pressing device including the soft member 47 and the driving member 48. As shown in FIGS. 6A to 6D, the collapsible core 50 includes a truncated cone-shaped core 51 and spring bodies 52 and 53 provided around the core 51. The spring bodies 52 and 53 are both urged inward, and the spring bodies 52 and 53 are
a and 53a. The portions 52a, 53a of the spring bodies 52, 53 are alternately arranged adjacent to each other.

As shown in FIGS. 6A and 6B, when the core 51 of the collapsible core 50 is raised, the spring bodies 52 and 53 are raised.
Are spread radially outward, and the spring bodies 52, 53
Presses the thread twist 27 of the cup 11 against the female mold 31.

On the other hand, as shown in FIGS. 6C and 6D, when the core 51 is lowered, first, the portion 52a of the spring body 52 moves inward, and thereafter, the portion 53a of the spring body 53 moves inward. Therefore, the pressing of the thread twist 27 by the spring bodies 52 and 53 is released.

As described above, the diameter D ₁ of the spring bodies 52 and 53 shown in FIGS. 6A and 6B is larger than the diameter D _{2 of the} spring bodies 52 and 53 shown in FIGS. 6C and 6D. ing.

Next, a method for manufacturing the composite container will be described. First, a laminated blank material including a paper layer is prepared as follows. That is, printing is performed on the paper stock constituting the paper layer, and then a thermoplastic resin such as polyethylene and various barrier materials are stacked on the paper stock to produce a laminated blank material.

As the laminated blank material, for example, the following layer structure can be considered in order from the outside.

Thermoplastic resin / paper / adhesive layer / barrier layer / pinhole-resistant layer / thermoplastic resin Of the above layer structure, the outer thermoplastic resin and the adhesive layer / barrier layer / pinhole-resistant layer are omitted. Is also good.

Next, a blank for the trunk portion and a blank for the bottom portion are formed by punching out such a laminated blank material. The bottom 12 is made from the blank. Next, the body 11 and the bottom 12 are connected at the bottom edge 26 to form the cup 10.

Next, a cup 10 having a body 11 and a bottom 12 and made of a laminated blank material is loaded in a female mold 31. In this case, the slide body 40 is located radially outward and away from the body sticking portion 25 (the position in FIG. 5A).

Next, the female mold 31 approaches the male mold 32 and mold clamping is performed, so that a cavity is formed between the female mold 31 and the male mold 32. In this case, the cup 10 is placed in the cup loading space 49 of the cavity. At the same time, the cup 10 in the cup loading space 49 is
On the entire surface other than 43 and 45a, the female mold 31 and the male mold 32 are tightly clamped. The thread 27 of the cup 10 is pressed against the inner surface of the female mold 31 by the soft member 47 or the spring bodies 52, 53 of the collapsible core 50 (FIGS. 4 and 6). Next, the slide body 40 moves inward in the radial direction and presses the body sticking portion 25 inward in the radial direction.
5 is firmly held between the male mold 32 and the slide body 40.

Next, the synthetic resin is injected from the male injection gate 35 toward the resin molding portion 41 for forming the flange portion, and the synthetic resin injected into the resin forming portion 41 for forming the flange portion is thereafter applied to the end surface of the body. Through the resin molding portion 42 for forming the covering portion, it reaches the resin molding portion 43 for forming the bottom edge covering portion and the resin molding portion 45a for forming the stack rib. In this way, the flange portion 21 is formed around the upper opening edge of the cup 10, and the body sticking end surface covering portion 21 is formed on the inner surface of the body sticking portion 25. At the same time, the bottom edge covering portion 23 and the stack rib 45 are formed on the inner surface of the bottom edge portion 26.

In this case, the resin molded portions 41, 4 made of synthetic resin
2, 43 and 45a are all provided inside the cup 10, so that the cup 10 is
By pressing against the inner surface, the positional accuracy of the cup 10 in the cavity can be improved. Also, since the cup 10 is tightly clamped between the female mold 31 and the male mold 32,
The synthetic resin does not leak to portions other than the resin molded portions 41, 42, 43 and 45a. In addition, injection gate 35
Is located at a position corresponding to the inner surface of the body pasting portion 25, the synthetic resin from the injection gate 35 is passed from the flange portion forming resin molding portion 41 to the body pasting end surface covering portion molding resin molding portion 42,
The transition to the resin molding portion 43 for forming the bottom edge coating portion and the resin molding portion 45a for forming the stack rib can be smoothly performed.

Further, since the body sticking portion 25 having the step portions 58 at both ends is firmly held between the male mold 32 and the slide body 40, leakage of the synthetic resin from the vicinity of the body sticking portion 25 can be prevented. Absent. Furthermore, since the slide body 40 presses the body pasting portion 25 from the outer surface with a certain area, even if the body pasting portion 25 is slightly displaced with respect to the slide body 40, the body pasting portion 2 is pressed.
5 can be reliably pressed between the male mold 32 and the slide body 40.

In this manner, a composite container is obtained by molding the flange portion 21, the body sticking end surface covering portion 22, the bottom edge covering portion 23, and the stack rib 45 on the cup 10.
In this composite container, a gate mark 21a formed by the injection gate 35 is formed on the inner surface of the flange portion 21 (see FIG. 2). However, by forming the injection gate mark 35 on the inner surface of the flange portion 21, the gate mark 21a is moved outward. Not noticeable from. When a plurality of composite containers are stacked, the stack rib 45 of the composite container comes into contact with the bottom surface of the thread 27 of the composite container located above. Therefore, when stacking the composite containers, a plurality of composite containers are not tightly fitted, and thereafter, the individual composite containers can be easily taken out.

Next, the synthetic resin injected from the injection gate 35 of the male mold 32 to the resin molded portions 41, 42, 43, 45a of the cavity will be described in detail. As the synthetic resin, for example, high-density polyethylene can be used.

Here, the melt index (index indicating fluidity) may be 20 or more, and more preferably 30 or more.

The density affects the rigidity of the composite container, and is preferably 0.93 or more.

As described above, the laminated blank of the cup 10 has a paper layer, but by removing the paper layer from the laminated blank at a desired portion of the trunk of the cup 10, the transparent portion is removed. 60 may be formed (FIG. 1). In this case, the layers other than the paper layer in the laminated blank material are made of a transparent material, and the inside can be confirmed through the transparent portion 60.

The layer structure of the laminated blank material is, in order from the outside, a first polyethylene / paper / second polyethylene, a low-density polyethylene having a low softening point is selected as the first polyethylene, and the second polyethylene is softened. High density polyethylene with high points may be selected.

As described above, the cup 10 is formed by using the laminated blank having the low-density polyethylene provided on the outside of the paper layer, and the synthetic resin is injected into the cup 10 so that the flange portion 21 and the end face of the body are stuck. The coating part 22, the bottom edge coating part 23, and the stack rib 45 are formed, and a composite container is obtained.

The composite container is then heated at about 120 ° C. to vaporize the water in the paper, so that only the low-density polyethylene located outside the cup 10 foams to form a foam. Since the foam is formed outside the cup 10 as described above, the heat insulating property is improved, and the cup 10 can be easily gripped even when the high-temperature content is filled in the composite container.

[0043]

As described above, according to the present invention, it is possible to prevent the leakage of the injection resin in the vicinity of the body sticking portion.
The composite container can be manufactured with high accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a composite container obtained by a composite container manufacturing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a side sectional view showing an apparatus for manufacturing a composite container according to the present invention.

FIG. 5 is a side sectional view showing a modified example of the composite container.

FIG. 6 is a side sectional view showing a modified example of the composite container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cup 11 Body part 12 Bottom part 21 Flange part 22 Body sticking end face covering part 23 Bottom edge covering part 25 Body sticking part 26 Bottom edge part 31 Female type 32 Male type 40 Slide body 40a Notch space 41 Flange part forming resin molding part 42 Resin molding part for molding the end surface covering part of the trunk 43 Resin molding part for molding the bottom edge covering part 45 Stack rib 45a Resin molding part for stack rib 47 Soft member 48 Drive member 50 Collapseable core

Claims (1)

[Claims] 1. An injection mold comprising a female mold and a male mold, having a body and a bottom with an open upper end, and forming a cavity into which a cup made of a laminated blank material including a paper layer is loaded. The cavity has a resin molded portion for a flange portion at a position corresponding to the peripheral edge of the opening at the upper end of the cup, and the body portion of the cup is formed by laminating a laminated blank material at the body sticking portion. A resin molding part for the body sticking end surface covering part at a position corresponding to the above, and a slide body for pressing the body sticking part inward in a part of the injection mold corresponding to the outer surface of the body sticking part of the cup. An apparatus for manufacturing a composite container, wherein the apparatus is provided so as to be freely movable in a direction.