JPH05301304A - Forming method for food packaging container - Google Patents

Abstract

PURPOSE:To simplify and solidify a structure of forming means for a container consisting of front and rear plates connected with a bottom plate and standing inclinedly and a side plate. CONSTITUTION:A base 1 provided with front and rear plates (b) and (c) connected with continuously on front and rear sections of a bottom plate (a) is formed into the given shape by heat melting the bottom plate (a) and folded sections of front and rear plates (b) and (c) and simultaneously standing the front and rear plates (b) and (c) and then fitting the same with the side plates 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a food packaging container using a foamed or non-foamed thermoplastic resin sheet, wood material, cardboard or the like.

[0002]

2. Description of the Related Art Although various structures of food packaging containers are known, the containers to which the present invention is applied are shown in FIGS.
As shown in Fig. 1, the container is composed of front and rear plates b and c that are continuous with the bottom plate a and stand upright, and side plates d and e. In particular, the side edges of the bottom plate a and the front and rear plates b and c are projected as shown in Fig. As the ear portion f, or as an ark like an ear portion g by projecting the end edge and the lower edge of the side plate as shown in FIG.

The conventional method of forming a container of this type is basically that in a substrate in which the bottom plate a and the front and rear plates b and c are integrated, a groove ( The front and rear plates b and c can be easily erected by forming one or a plurality of ridges, or they are bent and erected by using a pressing blade press to erect them, and then the side plates are fitted near the side edges of the substrate. Whether a mating groove is provided or a board fitting groove is provided inside the side plate, the side plates d and e are fitted into the fitting groove, or the board (bottom plate a and front and rear plates b and c) Each edge is fitted into the fitting groove, and at the same time, the container is formed by adhering with an appropriate adhesive. That is, in the conventional method of forming an ark-like container, the substrate (bottom plate a, front and rear plates b, c)
The container shape is held by the connection between the side plates d and e.

[0004]

In the above-described conventional method for forming an ark-like container, the container shape is retained by the side plates d and e.
Since the side plates d and e are erected on the bottom plate a, the side plates d and e and the front and rear plates b and c must be further connected to each other, and the adhesive effect is exerted. Until that time, it is necessary to maintain the shape, and its manufacture is very complicated. Therefore, the present invention proposes a simple method for forming the above-mentioned ark-like food packaging container.

[0005]

According to the method of forming a food packaging container of the present invention, a substrate having front and rear plates b and c connected to the front and rear parts of a bottom plate a is a bent curve portion of the bottom plate a and the front and rear plates b and c. The front and rear plates b and c are erected simultaneously with heating and melting to form a predetermined shape, and then the container is formed by fitting with side plates.

[0006]

When the bent portions of the bottom plate a and the front and rear plates b and c are heated and melted or the adhesive is heated and melted to erect the front and rear plates b and c, the melted parts are bonded to each other and the bottom plate a The front and rear plates b and c stand upright and are in a fixed state, and when the side plates d and e are attached by the fitting means, an ark-like container for food packaging is formed.

[0007]

EXAMPLES Next, examples of the present invention will be described. <First Embodiment> FIGS. 1, 2 and 3 show a first embodiment of the present invention. This embodiment is an example in which a fitting groove is provided in a substrate. In the first embodiment, an ark-like container A is formed by using one substrate 1 and two side plates 2. The substrate 1 is formed of a foamed thermoplastic resin and has a bottom plate a of the container A. The front and rear plates b and c are arranged in series, and a side plate fitting groove 11 is provided near the side edge. The side plate 2 has a trapezoidal shape corresponding to the side shape of the ark-like container A to be formed.

Thus, the bottom plate a and the front and rear plates b, c of the substrate 1 are heated and melted at the same time, and at the same time, the front and rear plates b, c are erected and once formed into a predetermined shape of the half container A1. To do. An example of the implementation device is
As illustrated in FIG. 3, it is composed of a fusion zone 01, a pressing zone 02, and a forming hole 03. The melting section 01 is composed of two heat blades (heating bodies) arranged in parallel, and a holding vertical movement mechanism for holding and moving the hot blades up and down, and the pressing section 02 is a pressing device for pressing the substrate 1 into the forming hole 03. The formation hole portion 03 has an inclined inner wall surface corresponding to the plane projection of the ark-like container A to be formed from the plane projection of the substrate 1.

Therefore, in the above apparatus, the bent portion 12 of the substrate 1 is heated and melted by the hot blade 01, and at the same time, the substrate 1 is pushed by the pushing portion 02.
The front and rear plates b and c for pushing the holes into the forming hole 03 are erected, the melted portion (folded curve portion) 12 is welded, and a half container A1 having side openings is formed. Next, the side plate 2 is attached, and since the semi-container B has a robust connection between the bottom plate a and the front and rear plates b and c standing up front and back, the side plate 2 is fitted into the fitting groove 11.
The ark-like container A having the ears f can be formed by press fitting.

The method of the present invention may be modified in various ways from the above-described first embodiment. For example, the vicinity of the fitting groove 11 is not melted and bent in advance so that the molten liquid does not enter the fitting groove 11. A groove for use may be formed, or a shallow groove may be selectively provided in advance in the bent curve portion so that excessive melting does not occur when the standing angles of the front and rear plates b and c are large. Also, without using a thermoplastic resin on the substrate, a bending groove is provided in the bending curve part, a hot melt adhesive is applied in advance to the groove, and the adhesive is heated and melted by a heating body or ultrasonic heating. You may form a half container.

<Second Embodiment> FIGS. 4 and 5 show a second embodiment of the present invention. This embodiment is an example in which a fitting groove is provided in a side plate. The second embodiment is similar to the first embodiment in that a container B is formed by using one substrate 3 and two side plates 4, and the substrate 1 is formed of a foamed thermoplastic resin. The bottom plate a and the front and rear plates b and c are connected in size. .. The side plate 4 has a shape corresponding to the side shape of the container A to be formed, and has a fitting groove 41 penetrating up and down near the side edge of the inner surface and a fitting groove 42 penetrating forward and backward near the lower edge of the inner surface. is there.

Thus, the bottom plate a and the front and rear plates b and c of the substrate 3 are heated and melted at the same time, and at the same time, the front and rear plates b and c are erected and once made into a predetermined shape (semi-container B1). Form. Next, the side plate 4 is attached, and since the half container B1 has a robust connection between the bottom plate a and the front and rear plates b and c which are continuous upright in the front and rear direction, each side edge of the substrate 3 is attached to the side plate 4. When the fitting grooves 42 and 43 are press-fitted and fitted, the container B having the ears g is formed.

The above-mentioned container B is one in which the top edges of the front and rear plates b and c are projected above the upper edge of the side plate 4, and the fitting groove 41 of the side plate 4 is vertically penetrated. because there is,
When the containers B are stacked, the protruding edges of the front and rear plates b and c are fitted into the fitting grooves 41 of the upper container, so that there is an advantage that the containers can be stacked without displacement.

Various modifications can be made in the second embodiment in which the fitting grooves 41, 42 are formed in the side plates, and the standing angles of the front and rear plates b, c are not upright but are appropriately inclined to the ark. Alternatively, a shallow groove may be selectively provided in advance in the bent curve portion so that excessive melting does not occur when the standing angles of the front and rear plates b and c are large. Further, as shown in FIG. 6, instead of forming the fitting groove 43 in the side plate 4a, a mold may be used, or a partition part 32 formed by heat molding on the substrate 3 may be used. . Of course, it is also possible to adopt a semi-container formation using a hot-melt adhesive by forming a bending groove in the bent line portion without using a thermoplastic resin for the substrate.

<Third Embodiment> FIG. 7 shows a third embodiment. In this embodiment, a through hole 51 is provided as a fitting groove for a side plate 6 in a board 5, and front and rear plates b and c are provided. Is fixed upright to form a semi-container C1, and the rear side plate 6 is inserted into the through hole 51 to form the container C. Further, in the formation of the container C, the portion of the folding curve portion 52 adjacent to the inner through hole 51 is formed as a recess 52a so that the through hole 51 is not deformed when the front and rear plates b and c are erected. The side plate 6 is provided with a stopper portion 61 with the through hole 51.
In the case of the container C, the lower part of the side plate 6 serves as the legs 61 by adopting the through holes 51, so that the container with legs can be easily obtained. As a modified example of the above embodiment, the stopper portion may be provided so as to be located on the upper surface of the substrate, or further, the through hole may be provided in the side plate so that the edge of the substrate is inserted into the through hole. You can

[0015]

INDUSTRIAL APPLICABILITY The present invention relates to a container for food packaging, in particular, a container formed by a side plate and a substrate in which front and rear plates connected to the front and rear parts of a bottom plate are connected to each other. A semi-container with a robust side opening is formed, and then the container is formed by fitting it into a fitting groove formed in the substrate or side plate in advance. In addition, it is possible to use a conventional box-shaped container manufacturing machine for forming a box-shaped container by erecting the four peripheral plates, and automatic formation by the machine is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a first embodiment of the present invention.

FIG. 2 is a perspective view of a container produced by the same method.

FIG. 3 is a simple explanatory diagram of an implementation device.

FIG. 4 is an explanatory view showing the manufacturing process of the second embodiment of the present invention.

FIG. 5 is a front view showing a stacked state of containers produced by the same method.

FIG. 6 is a perspective view of a member of a modified example of the second embodiment.

FIG. 7 is an explanatory view showing the manufacturing process of the third embodiment of the present invention.

[Explanation of symbols]

 A, B, C container A1, B1, C1 half container 1, 3, 5 substrate 11, 41, 42, 43 fitting groove 12, 31, 52 folding curve part 32 partition part 2, 4, 4a, 6 side plate 51 penetrating Hole

Claims (5)

[Claims] 1. A thermoplastic resin substrate having front and rear plates connected to each other at the front and rear parts of the bottom plate and having side plate fitting grooves provided in the vicinity of side edges, and a bending curve of the bottom plate and the front and rear plates on the substrate. A method for forming a food packaging container, characterized in that the front and rear plates are erected at the same time as the parts are heated and melted to be once formed into a predetermined shape, and the rear side plate is fitted into the fitting groove. 2. A board having front and rear plates connected to front and rear parts of a bottom plate via bending grooves, hot-melt adhesive being applied to the grooves, and side plate fitting grooves provided in the vicinity of side edges. It is characterized in that the bending groove portion of this substrate is heated and melted, and at the same time, the front and rear plates are erected and once formed into a predetermined shape, and then the rear side plate is fitted into the fitting groove. A method for forming a food packaging container. 3. A thermoplastic resin substrate in which front and rear plates are connected to the front and rear parts of the bottom plate is heated and melted at the folding curve portions of the bottom plate and the front and rear plates, and at the same time the front and rear plates are erected to be once formed into a predetermined shape. A container for food packaging, characterized in that a side plate provided with a fitting groove corresponding to a bent shape of a plate and a bottom plate is formed, and an edge of the bent substrate is fitted into the fitting groove. Forming method. 4. The front and rear plates are connected to the front and rear parts of the bottom plate through bending grooves, and a hot melt adhesive is applied to the grooves to heat and melt the bending grooves, and at the same time the front and rear plates are erected. At least once formed into a predetermined shape, and a side plate provided with a fitting groove corresponding to the bent shape of the front and rear plates and the bottom plate is formed separately, and the edge of the bent board is fitted into the fitting groove. A method for forming a food packaging container, comprising: 5. The method for forming a food packaging container according to any one of claims 1 to 4, wherein the fitting groove is a through groove.