JPH0544271Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a composite container made by combining a sheet-like material such as cardboard or paperboard with foamed polystyrene or other foam molded resin.

[Prior Art] It is already known to manufacture a composite container having heat insulating properties by combining a resin foam such as expanded polystyrene with paper, plastic film, metal foil, etc. Such containers can be made by inserting a sheet material such as paper punched into a desired shape into a container mold and then injecting synthetic resin into the mold to obtain a composite container, or by combining paper and foam. A composite material is formed by bonding the foam sheet with an adhesive, and a bending groove is formed on the foamed sheet using a heated blade.The composite material is then folded along the bending groove to assemble the container, and the abutting portion is taped. They were pasted together to form a rectangular parallelepiped container.

[Problems to be solved by the invention] When manufacturing any of the above types of composite containers, Styrofoam has poor adhesive properties, so a heat-adhesive film is pasted on the back of the sheet material in advance, or an adhesive is used to manufacture the composite container. It is necessary to apply this heat-adhesive film or adhesive to firmly bond the Styrofoam and sheet material so that they do not separate. However, attaching a heat-adhesive film or applying an adhesive to the back side of the sheet material each time during manufacturing has the disadvantage of lowering manufacturing efficiency and increasing manufacturing costs.

The object of the present invention is to propose a bondless composite container with a new configuration that solves the above problems.

[Means for Solving the Problems] To summarize the technical means adopted by the present invention to achieve the above object, a composite container consisting of a foam-molded container body and a sheet material combined with the outer surface of the container body. The sheet material cut into a desired shape and having a hole or notch in a part thereof is inserted into a container mold, and the resin injected into the clamped mold is poured into the container mold. This is a composite container formed by cutting into the hole or notch.

[Function] After preparing the sheet material produced as described above and setting it in a mold for molding a container, when a resin for foam molding is injected into the mold, the resin sheet material in the fluidized state It is cut into the hole or cutout and is integrally bonded to the sheet material.

[Example] Next, an example of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a perspective view showing an example of a composite container 10 according to the present invention, which is a combination of sheet material and foam molded resin.

In the figure, reference numeral 11 denotes a top-opening container body, which is made of a foamed molded resin material such as expanded polystyrene. 12 is the container body 11
This is a sheet material for reinforcing containers or for decoration placed on the outer surface of the lower part of the container. This sheet material 12 is formed using a base paper such as cardboard or paperboard whose surface is printed as necessary, or a composite material in which a synthetic resin film or metal foil is bonded to at least one side of the base paper. There is. Such a sheet material is punched into a desired developed shape, for example, a planar cross shape as shown in FIG. A plurality of holes 14 or notches 15 are formed into which the resin to be injected bites.

As illustrated in FIG. 5, the notch 15 is preferably formed in the shape of a dovetail groove with a narrow entrance and a widening inside.

After the sheet material 12 formed in this way is set between male and female molds (not shown) during container molding,
A resin for foam molding is injected into the clamped mold, and when the resin is foamed, the flowing resin is bitten into the hole 14 or cutout 15 provided at or near the edge of the side plate 13 of the blank sheet. By doing so, the molded container body 11 and the sheet material 12 are integrated.

In this case, a hot-melt adhesive coating layer or a heat-adhesive film layer 16 is provided on the back side of the sheet material 12 in advance, and the hot-melt coating layer or the like is thermally melted at the same time as the resin is foam-molded to form the sheet material 12. Of course, it is also possible to fuse the container main body 11.

As shown in FIGS. 2 and 3, in the composite container after molding, the end of the sheet material 12 is not exposed inside the container 11, and the outer surface of the lower part of the container is made of a base paper such as corrugated cardboard or paperboard, or a combination thereof. A highly rigid composite container 10 is obtained which is covered and protected by the sheet material 12.

Note that this composite container can be used, for example, by covering its opening with a lid and storing appropriate products as a heat/cold container, gift container, or other general distribution container. Furthermore, depending on the purpose of use, the container body 11 can be provided with an internal partition 17 (see FIG. 3) by integral molding, and a protrusion 18 for stacking can also be provided at the opening of the container. (See Figure 6). Incidentally, what is indicated by the reference numeral 19 in FIGS. 4 and 6 is a hole formed in the blank sheet corresponding to the projection 18. Further, FIG. 8 is a partially cutaway sectional view of the container shown in FIG. 6. Note that, as described above, the developed shape of the sheet material does not have to be a planar cross shape, and a sheet material having an appropriate shape can be selected and used depending on the shape of the container body to be molded.

[Effects of the invention] As explained above, the invention provides sheet materials such as cardboard and paperboard on the surface of the foam molded container body.
It is possible to easily form a highly rigid composite container that is assembled into one body at the same time as molding. In particular, it exhibits a practical effect not found in conventional types in that a bondless composite container can be obtained that does not require attaching a heat-adhesive film or applying adhesive to the back side of the sheet material during molding.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a container according to an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of the same container, Fig. 3 is a longitudinal cross-sectional view of the same container, and Fig. 4 is a diagram showing the sheet material used in the present invention. 5 is an explanatory diagram showing the shape of the notch, FIG. 6 is a perspective view of the container of the present invention having a stacking protrusion, FIG. 7 is a perspective view showing the containers stacked together, and FIG. FIG. 7 is a partially cutaway perspective view of the container shown in FIG. 6; 10...Composite container, 11...Container body, 12...
... Sheet material, 13 ... Side plate, 14 ... Hole, 15
...Notch, 16...Hot melt coat layer, 1
7...Inner partition, 18...Protrusion, 19...Hole.

Claims (1)

[Claims for Utility Model Registration] 1. A composite container consisting of a foam-molded container body and a sheet material assembled on the surface of the container body, which is cut into a desired shape and has a hole or notch in a part thereof. The composite container is obtained by inserting the sheet material having a shape of 100% or less into a container mold, and then injecting the resin injected into the clamped mold into the hole or notch. 2. The composite container according to item 1, wherein the sheet material is made of a base paper such as corrugated cardboard or paperboard, or a composite material in which a synthetic resin film, metal foil, etc. is bonded to the base paper. 3. The composite container according to any one of item 1 or 2, wherein the hole or cutout is formed at or near an edge of the sheet material, and the cutout is formed in a dovetail shape. 4. The composite container according to any one of items 1 to 3, wherein a partition wall is integrally erected on the inner surface of the bottom of the container body. 5. The composite container according to any one of items 1 to 4, wherein the sheet material has a hot melt adhesive coat layer or a heat adhesive film layer on the back surface.