JPS5917664B2 - Composite container manufacturing method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a composite container with a beautiful appearance and an apparatus for manufacturing the same. a flaky material;
The present invention relates to a method and a manufacturing apparatus for efficiently manufacturing a composite container with an excellent appearance that is integrated with a synthetic resin frame formed by injection molding.

5. Conventionally, most thin-walled synthetic resin containers have been manufactured by injection molding, which has caused various technical problems such as injection pressure and mold accuracy.

For this reason, when manufacturing thin-walled containers by injection molding, a portion of the final product, for example, the portion that will form the outer peripheral wall of the container, is pre-shaped into the desired shape from a flexible thin piece of material. A cut-out panel material is prepared, and the panel material thus cut out is fixed in an injection mold cavity prior to manufacturing the container, and the remaining portion of the mold cavity, e.g., the top edge of the container, is A method has been adopted in which molten thermoplastic synthetic resin is press-fitted into the cavity part that forms the frame, such as the lower edge, wall ribs, etc., and the resin is cooled and solidified to integrate the panel material and the frame. (See, eg, US Pat. No. 3,119,540). Such a composite container is a container that is made up of a panel material that is cut out in advance into a desired shape and inserted and fixed into a mold, and a synthetic resin frame that is later formed by injection molding. be.

During manufacture of such composite containers, if the panel material is not properly inserted and fixed into the injection mold, the panel material may become caught between the split surfaces of the female mold, resulting in poor appearance. There was a problem that only products with low commercial value could be obtained. The present invention aims to eliminate the drawbacks of the conventional composite container manufacturing method as described above, and to provide an industrially advantageous method and apparatus for manufacturing composite containers with a beautiful appearance and high commercial value.
This is the purpose.

The gist of this is that the panel material made of flexible material that forms the side and bottom walls of the container is inserted into a cavity formed by a male mold and a female mold that can be divided into two parts. In order to manufacture a composite container in which the panel material and the framework are integrated, the panel material is fixed and held, and a framework is formed by injecting molten thermoplastic synthetic resin into the remaining part of the cavity, and after cooling, the panel material and the framework are taken out from the mold. The bottom wall panel of the panel material is sucked and held by the tip of the male die, the male die is pushed into the female die, and an auxiliary pressing member is brought into contact with the upper edge of the panel material which has been pushed into the female die to some extent and has become approximately container-shaped. The present invention relates to a method for manufacturing a composite container, characterized in that the panel material is auxiliarily pressed into the female mold to complete the pressing, and then the female mold is closed together, and a manufacturing apparatus for carrying out this method. Hereinafter, the method and apparatus of the present invention will be explained based on the drawings, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Fig. 1 is a plan view showing an example of a panel material made of a flexible material used in the method of the present invention, and Fig. 2 is a plan view showing an example of a panel material made of a flexible material used in the method of the present invention. FIG. 3 is a side view showing an example of the apparatus of the present invention, and FIGS. 4 to 7 are enlarged views showing the steps for manufacturing the composite container. In each figure, A is a longitudinal sectional side view of the apparatus according to the method of the present invention, the opening is an A-A-D-D sectional view of each figure A, and each figure C is a sectional view corresponding to the opening of each figure when using the conventional method. FIG. 8 is a drawing corresponding to FIG. 6A showing another example of the apparatus of the present invention.

In the figure, 1 is a panel material used for container manufacturing, and this panel material 1 is a bottom wall panel 2 that constitutes the bottom wall of the container.
and the side wall panel 3 constituting the side wall of the container is connected to the hinge portion 6.
It is connected by.

4 is an upper edge of the side wall panel 3, 5 is a lower edge of the side wall panel 3, 6 is a hinge portion, 7 is a notch portion, 8 is a synthetic resin frame,
9 is a flange part, 10 is a movable platen of the injection molding machine, 11 is a male mold fixed base, 12 is a male mold fixed plate, 13 is a stripper plate, 14 is a male mold, 15 is an auxiliary pressing member, and 16 is a panel material. 1 guide rail, 17 is the fixed plate of the injection molding machine, 1
8 is a spacer, 19 is a hot runner block, 20
2 is a plate, 21 is a female type guide block, 22 is a split female type, 23 is a female type sliding surface, 24 is an auxiliary pressing member insertion groove, 2
Reference numeral 5 indicates a resin introduction part of the female mold 22, 26 a resin introduction part of the male mold 14, 27 a pressing plate, 28 a protrusion, and 29 a decompression hole.

The panel material 1 used in the present invention may be manufactured from a flexible material, or the flexible material may be paper, a laminate of synthetic resin and paper, a synthetic resin sheet, a laminate of paper and metal foil, or paper and gold. Various materials are selected depending on the application, such as a laminated material of layered foil and synthetic resin.

As shown in a plan view in FIG. 1, its shape is such that a bottom wall panel 2 forming the bottom wall of the container and a side wall panel 3 forming the side walls of the container are connected by a hinge portion 6. The bottom wall and side walls of the container are constructed using such a panel material 1, and the required parts of the panel material 1 are joined by a synthetic resin framework 8 to produce a composite container as shown in FIG. However, the process will be explained according to the drawings.

FIG. 3 is a side view showing a state in which the mold is opened and ready for molding, and from this state the movable platen 10 of the injection molding machine is moved in the direction of the female mold 22.

The male mold 14 is moved together with the movable platen 10 toward the female mold 22, and first, the panel material 1 carried within the guide rail 16 is suctioned and held at the tip of the male mold 14. The suction holding mechanism may be any mechanism as long as it applies reduced pressure to the pressure reduction hole 29 as shown in the figure to suction and hold the panel material 1 to the tip of the male die 14. The male mold 14, which has sucked and held the panel material 1 by the depressurizing action of the depressurizing hole 29, passes through the guide rail 16 and is advanced further to the right, reaching the female mold 22 which is in a split open state.

When the male mold 14 is further advanced and enters the female mold as shown in FIG. The panel material 1 is bent from the hinge portion 6 and placed along the male mold 14 as shown in the opening of FIG. Near the sides, two plates that are symmetrical across the central axis of the male mold, perpendicular to the dividing plane of the female mold, and protrude at the same height from the fixed plate side of the male mold to the tip of the male mold. The auxiliary pressing member 15 made of a shaped body comes into contact with it. The state of the panel material 1 in this state when using the conventional method without using the auxiliary pressing member 15 is shown in FIG. 4C.
When the male mold 14 is further pushed from the state shown in FIG. 4A to the position shown in FIG. 5A, the panel material 1 is further bent by the female mold 22, and the male mold 14 assembled into the shape of the outer surface of. In this state shown in Figure 5 A,
In the case of the conventional method that does not use the auxiliary pressing member 15, as shown in FIG. In many cases, one of the parts of the female mold 22 that presses the panel material 1 comes off from the corner of the female mold 22, and in such cases, the elasticity of the panel material 1 causes the blade that has not yet come off (in the direction of the arrow shown) This causes the side wall panel 3 to be pushed out of position. This has been a major drawback when manufacturing composite containers by a method that does not use the auxiliary pressing member 15. Such misalignment of the panel material 1 can be caused by a very small deviation during the feeding of the panel material 1, a slight difference in frictional resistance on the surface of the panel material 1, a slight dimensional difference when creating the panel material 1, etc. When made into a product, this caused a large deviation, reducing the product value. The method of the present invention prevents the above-mentioned misalignment of the panel material 1 during insertion into the mold using a simple knife method, or the upper edge 4 of the panel material 1 referred to in the method of the present invention In this method, an auxiliary pressing member is brought into contact with the panel member, and the panel material is pushed into the female mold while being auxiliary pressed.

That is, in the state shown in FIG. For example, as in the case of the conventional method without using an auxiliary pressing member,
Even if one of the parts of the side wall panel 3 pressed by the female die 22 comes off early, the pushing into the female die is completed without being displaced. During this pushing, the auxiliary pressing member 15 provided on the male mold side is inserted into the auxiliary pressing member fitting groove 24 opened on the dividing surface of the female mold.
be fitted to the The opening of the auxiliary pressing member fitting groove 24 is preferably sized so that even when the auxiliary pressing member 15 is inserted, a slight gap remains. The state in which pushing has been completed is shown in Figure 6, A. Further, FIG. 6C shows a state in which the conventional method of pressing without using an auxiliary pressing member is completed. In the state shown in FIG. 6A, for example, the female mold 2
2 is configured with a pressing plate 27 etc., and when the male mold 14 is pushed into the female mold 22, the lower edge 5 of the side wall panel 3 of the panel material 1 is the pressing plate 27 (bottom of the female mold). It is preferable that the side wall panel 3 is held between the auxiliary pressing member 15 and the pressing plate 27 so that the positioning is perfect.

The auxiliary pressing members 15 are two pieces that are symmetrical across the central axis of the male mold 14, perpendicular to the dividing plane of the female mold, and protrude at the same height from the fixed plate side of the male mold to the tip end side of the male mold. It consists of a plate-like body.

The auxiliary pressing member 15 is placed near the side of the male mold, especially from the base of the male mold by 2 to 10 m77! It is best to install it with a gap between the two.

In addition, if the auxiliary pressing member 15 is installed by accurately measuring the distance from the tip of the male mold 14, the side wall panel 3
The auxiliary pressing member 15 may be attached to the stripper plate 13 via a spring or the like, since a certain amount of pressing force is applied to the upper edge 4, although this is unlikely to damage the upper edge 4.

However, the upper edge 4 will be later embedded in a synthetic resin framework, and any small scratches will be hidden by this framework, so there is little problem. Next, when the male mold 14 advances further, the female mold 22 is pushed by the fixed plate 12 of the male mold 14 and starts sliding along the female mold sliding surface 23 of the female mold guide block 21, and the seventh In Figure A, the CUI is closed as shown.

In this way, the male mold 14 and the female mold 22 are combined and firmly held between the male mold fixing plate 12 provided on the male mold fixing base 11 and the plate 20. This state in a conventional method that does not use an auxiliary pressing member is shown in FIG. 7C. In the device shown in FIG. 8, the female mold 22 is
A protrusion 28 is provided at the bottom of the side wall panel 3 so that the lower edge 5 of the side wall panel 3 is pressed against the protrusion 28. In this way, the pressing plate 27 is not used, and the final product has the following properties: This has the effect of reducing burrs.

After the molds are completely closed in this manner, molten thermoplastic synthetic resin is passed through a hot runner block from an injection molding machine or the like (not shown) into the cavity of the mold from the notch 7 of the bottom wall panel 2. The resin is introduced into the remaining parts of the first part, that is, the resin introduction part 25 of the female mold 22 and the resin introduction part 26 of the male mold 14, the panel material 1 is joined and reinforced, and after cooling, the mold is opened and the stripper plate is 13, the product is ejected from the male die to complete the molding.

The thermoplastic synthetic resin used to form this framework may be any thermoplastic synthetic resin commonly used in injection molding, such as polyethylene, polypropylene, polybutene-1, ethylene-propylene, etc. Polymers, olefin resins such as ethylene monovinyl acetate copolymer, polystyrene, styrene resins such as acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene terpolymer, polyvinyl chloride [■
- Thermoplastic synthetic resins such as polyamides such as vinyl chloride copolymers, nylon 6, nylon 6-6, and nylon 6-10 are used alone or in combination with other resins, especially olefins. type resins are preferably used.

To these thermoplastic synthetic resins, antioxidants, ultraviolet absorbers, heat stabilizers, antistatic agents, dyes, pigments, organic fillers, inorganic fillers, etc. may be added and mixed in appropriate amounts depending on the purpose.

As described above, according to the method of the present invention, when inserting the panel material 1 into the mold, the upper edge 3 of the panel material 1 is pressed and held by the auxiliary pressing member, so that the panel material 1 is inserted into the mold. It can be prevented from shifting and being held fixed.

Therefore, the composite container manufactured by the method of the present invention is one in which the panel material 1 is properly adhered to the frame 8 made of thermoplastic synthetic resin in an accurate position, and has a beautiful appearance and a high commercial value. It can be made high.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of a panel material made of a flexible material used in the method of the present invention, and Fig. 2 is a plan view showing an example of a panel material made of a flexible material used in the method of the present invention. FIG. 3 is a side view showing an example of the apparatus of the present invention, and FIGS. 4 to 7 are enlarged views showing the steps for manufacturing the composite container. In the figures, A is a vertical sectional view of the device according to the method of the present invention, and the opening is A-A-D-D in each figure.
Cross-sectional views, each figure C is a cross-sectional view corresponding to each view opening when using the conventional method, and FIG. 8 is a drawing corresponding to FIG. 6 A showing another example of the apparatus of the present invention. In the figure, 1 is the panel material, 2 is the bottom wall panel, 3 is the side wall panel,
Reference numeral 4 indicates the upper edge of the side wall panel 3, 14 indicates a male die, 15 indicates an auxiliary pressing member, and 22 indicates a split female die.

Claims (1)

[Scope of Claims] 1. A male mold and two panel members made of a flexible material in which a side wall panel forming a side wall portion of a container and a bottom wall panel forming a bottom wall portion are connected at a hinge portion. The remaining part of the cavity is injected with molten thermoplastic synthetic resin to form a skeleton, and after cooling, the mold is removed and the mold is removed. In manufacturing a composite container in which a panel material and a frame are integrated, the bottom wall panel is held by suction at the tip of a male mold, and the male mold is pushed into the female mold, and the male mold is pushed into the female mold to some extent and becomes approximately container-shaped. A method for manufacturing a composite container, which comprises: abutting an auxiliary pressing member against the upper edge of a side wall panel to auxiliarily press the panel material into a female mold to complete the pushing process, and then closing the female mold together. 2. The method for manufacturing a composite container according to claim 1, characterized in that the lower edge of the side wall panel is brought into contact with the bottom of the female mold upon completion of pushing the panel material into the female mold. Production method. 3 A panel material made of a flexible material, in which a side wall panel forming the side wall portion of the container and a bottom wall panel forming the bottom wall portion are connected at a hinge portion, is made into a male type and a female type that can be divided into two parts. The panel material is fixed and held in the cavity formed by the panel material, and the remaining part of the cavity is injected with molten thermoplastic resin to form a framework. After cooling, the panel material and framework are removed from the mold. In an apparatus for manufacturing a composite container, the tip has a mechanism for suctioning and holding the panel material, and the male mold is relatively movable in and out of the female mold. a female mold that can be divided into two parts, and a female mold that can be divided into two parts, symmetrically across the central axis of the male mold, and perpendicular to the dividing plane of the female mold, from the fixing plate side of the male mold. An auxiliary pressing member is provided on the tip side of the male mold, which is composed of two plate-shaped bodies protruding at the same height and abuts on the upper edge of the side wall panel.
An apparatus for manufacturing a composite container, characterized in that the female mold is provided with the auxiliary pressing member insertion groove.