JP2005126082A - Packaging container and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container, the design of which can be changed at a low cost easily. <P>SOLUTION: A plastic outer container 11 and a plastic inner container 12 are fitted together via an interposed inner packaging sheet 13 made of paper or plastic film with an offset print to form the packaging container B having a three-layer structure. An air layer is formed inside the bottom wall of the packaging container B, and an air vent passage is formed on a part of the peripheral wall of the container B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plastic packaging container, and more particularly to a packaging container for packaging food such as sugar beet and Japanese confectionery and a method for producing the same.

  As shown in FIG. 5, this type of packaging container A is molded into a container shape, and is transported, exhibited, and sold in a state where the upper surface opening is covered with a plastic lid or film.

  Conventionally, this packaging container A is manufactured as follows.

  I. As shown in FIG. 6, a two-layer sheet A1 is made by laminating a plastic film 2 that has been subjected to a design process such as a pattern or color on the surface of the plastic sheet 1 by gravure printing.

  II. The two-layer sheet A1 is thermoformed to produce a container sheet A2 in which a large number of recesses 3 are arranged at intervals in the vertical and horizontal directions.

  III. The container sheet A2 is cut at a portion connecting the recesses 3 to obtain a large number of container-like containers A having an open upper surface as shown in FIG.

In addition, as a composite container similar to this, a paper container (refer to Patent Document 1) in which a thermoplastic sheet is laminated on the outer surface of a paper box, or a body material is enclosed and integrated between both side plastic sheets. A constructed container (see Patent Document 2) is known.
JP 2000-238759 A Shokai 56-84927

  However, according to the publicly known technology in which the plastic film or the like that has been subjected to the design treatment as described above is integrated with the base material, the design is fixed to one. For example, according to seasonal changes, events, product campaigns, etc. In response to the desire to change the design, the only way to change the design is to increase the cost.

  Further, according to the known technology, there is a problem that the entire container is inferior in heat insulation and heat retention.

  Therefore, the present invention provides a packaging container that can easily change the design at low cost and can improve the heat insulation and heat retention of the entire container.

  The invention of claim 1 (packaging container) is formed by fitting an outer container body and an inner container body formed by molding a plastic sheet into a container shape with an interior sheet interposed therebetween. .

  The invention of claim 2 is the packaging container of claim 1, wherein the interior sheet is printed as a design treatment.

  The invention of claim 3 is the packaging container of claim 1 or 2, wherein paper is used as the interior sheet.

  The invention of claim 4 is the packaging container according to any one of claims 1 to 3, wherein the interior sheet is cut and bent into a shape corresponding to the outer container body and the inner container body.

  According to a fifth aspect of the present invention, in the packaging container according to any one of the first to fourth aspects, an air layer is formed inside a container peripheral wall constituted by the outer container body, the inner container body, and the interior sheet.

  The invention of claim 6 is the packaging container of claim 5, wherein the thickness of the air layer is set to 10 μm or more and 20 mm or less.

  According to a seventh aspect of the present invention, in the packaging container according to any one of the first to sixth aspects, an air vent passage is formed between the peripheral walls where the outer container body and the inner container body overlap, and the air is vented to the outside when both the container bodies are fitted. Is.

  The invention according to claim 8 (a method for manufacturing a packaging container) includes forming a plurality of recesses in a plastic sheet to form an outer container shot sheet and an inner container shot sheet, and an inner sheet in each recess of the outer container shot sheet. After inserting the container, the container shot sheets are overlapped in a state where the recesses are fitted to each other to form a three-layer sheet, and the upper surface is formed by cutting the three-layer shot sheet at a portion connecting the respective recesses. A large number of packaging containers are obtained which are composed of an open container-like outer container body, an inner container body, and an interior sheet interposed between the two container bodies.

  The invention of claim 9 is the method of claim 8, wherein the interior sheet is cut and bent into a shape corresponding to the recess of the outer container body shot sheet, and the interior sheet is fitted into each recess of the outer container body shot sheet. In this state, the inner container shot sheet is overlaid inside.

  According to the present invention, this interior sheet is replaced by interposing the interior sheet between the independent outer container body and the inner container body as a design sheet subjected to design processing such as printing (Claim 2). Design change is possible only by. That is, it is possible to easily change the design in accordance with the seasonal change or the like at a low cost.

  In addition, because the inner and outer container bodies are fitted with the interior sheet interposed between them, air is sealed between the container bodies, and the heat insulation effect by the interior sheet and this air is obtained. By being obtained, the heat insulation and heat retention of the entire container can be improved, and it is particularly suitable as a food container.

  Further, by forming the air layer positively over the entire bottom wall and side surfaces of the container as in the fifth aspect, higher heat insulation and heat retention can be obtained.

  Here, as in the sixth aspect, the thickness of the air layer is preferably 10 μm or more, more preferably 50 μm or more, and further preferably 100 μm or more from the viewpoint of improving heat insulation and heat retention. In addition, the thickness of the air layer is preferably 20 mm as an upper limit from the viewpoint of preventing cracking during punching.

  On the other hand, if paper is used as the interior sheet as in claim 3, offset printing can be performed in a small lot and at a low cost when printing.

  In this case, the interior sheet may be a flat sheet piece, but if it is cut and bent into a shape corresponding to both the outer and inner container bodies as in claim 4, there is no risk of the sheet moving. Moreover, since air is enclosed over the whole container surrounding wall, there exists an effect in improving heat insulation and heat retention.

  According to the seventh aspect of the present invention, when the inner container body is fitted to the outer container body, the air of both container bodies can be extracted to the outside by the air vent hole, so that the container bottom wall is partly formed by excess air. There is no problem of swelling or incomplete fitting.

  Further, according to the inventions of claims 8 and 9, a three-layer shot sheet is formed by superposing an inner container shot sheet and an interior sheet interposed between these recesses, with a recess, and this three-layer shot sheet. Since the three-layered packaging container is made by cutting the material, it can be mass-produced and the manufacturing cost can be reduced.

  A shot sheet refers to a thermoformed plastic sheet cut for each shot.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows the completed state of the packaging container B, and FIG. 2 shows its disassembled state. As shown in both figures, this container B is molded into a container shape with an open top, and is opened, covered with a plastic lid or film (not shown), and transported, displayed, and sold. Is done.

  The packaging container B includes an outer container body 11, an inner container body 12 having the same shape as the outer container body 11 and slightly smaller in size, and a design sheet interposed between the container bodies 11 and 12. It is comprised by the interior sheet 13.

  That is, both the container bodies 11 and 12 are formed as independent containers with the same plastic material, and both the container bodies 11 and 12 are provided with an interior sheet 13 between them as shown in FIGS. By fitting in a state, the packaging container B having a three-layer structure in which the interior sheet 13 is seen through from the outside is configured.

  Both container bodies 11 and 12 are formed with a flange portion 14 (see FIG. 3) whose section is bent in a stepped shape at the opening edge, and the entire body including the flange portion 14 is overlapped and fitted and joined. .

  The interior sheet 13 is formed by cutting and bending a paper such as high-quality paper or Japanese paper, a plastic film, and the like, so that the height of the interior sheet 13 is shorter than both the container bodies 11 and 12. By inserting the inner container body 12 in a state of being inserted into the container body 13, the sheet 13 is sandwiched between the container bodies 11 and 12.

  The interior sheet 13 plays a role as a design sheet by printing patterns, characters, colors, and the like on the surface or both front and back surfaces by offset printing or the like, and the printed patterns and the like are seen through from the outside.

  A pattern having a design effect or the like may be printed on the front surface of the interior sheet 13, and manufacturing data such as a manufacturing date, a raw material, a manufacturer name, or a price may be displayed on the back surface. When using Japanese paper, printing may not be performed in order to make use of the texture of the material itself.

  By the way, air is naturally enclosed inside the outer and inner container bodies 11 and 12 with the interior sheet 13 interposed between them, and this packaging container B is shown in FIG. In addition, an air layer 15 is actively formed in the bottom wall over the entire bottom wall. In other words, the height dimension of the outer and inner container bodies 11 and 12 and the thickness dimension of the interior sheet 13 are set so that such an air layer 15 is actively formed in the assembled state.

  The air layer 15 can enhance the heat insulation and heat retention of the container B (heat retention and cold insulation of the stored food).

The heat insulation effect of the packaging container of this invention is demonstrated based on an Example.
[Example 1]
From a polystyrene biaxially stretched sheet having a thickness of 0.25 mm, an inner container body 12 having an opening of 118 mm, a bottom surface of 83 mm, and a depth of 27 mm as shown in FIG. Further, an outer container body 11 having a shape shown in FIG. 2 having an opening of 118.5 mm, a bottom surface of 85 mm, and a depth of 30 mm was formed from a high impact polystyrene sheet having a thickness of 0.18 mm. 2 is inserted between the inner container body 12 and the outer container body 11 and made of paper of 40 μm, and the inner container body 12 is fitted outwardly. Got. The air layer thickness of this container was about 3 mm.

  After leaving the container in a thermostatic chamber at 23 ° C. for 24 hours, 85 g of 70 ° C. hot water was put into the container, and the surface temperature of the bottom of the container after 10 to 60 seconds was measured with a surface thermometer. The results are shown in Table 1.

[Comparative Example 1]
A container having the same shape as the inner container of Example 1 was formed from a polystyrene biaxially stretched sheet having a thickness of 0.25 mm. About the obtained container, the surface temperature of the container bottom part was measured on the same conditions as Example 1. FIG. The results are shown in Table 1.

  As shown in the above table, in the comparative example, the difference between the surface temperature of the bottom of the container and the temperature in the container at the time of 60 seconds is only 5 ° C., whereas according to the example container, the temperature difference is 17 ° C. High thermal insulation was demonstrated.

  On the other hand, as shown in FIG. 3, the upper part of the peripheral wall (the flange portion 14) of the outer container body 11 partially bulges outward to form a groove-like air vent passage 16, and the inner container body 12 is When fitting into the outer container body 11, excess air between the two is extracted outside by the air vent passage 16.

  For this reason, the problem that the container bottom wall partially swells due to excess residual air or the fitting of the container bodies 11 and 12 becomes incomplete does not occur.

  The air vent passage 16 may be provided only at one place on the peripheral wall, or may be provided at a plurality of places at an appropriate pitch.

  This packaging container B has a three-layer structure in which the interior sheet 13 is used as a design sheet as described above and is interposed between the outer container body 11 and the inner container body 12, and can be easily assembled and disassembled. The design can be changed simply by replacing the interior sheet 13.

  For example, the retailer may change the design according to seasonal changes, such as changing to a seasonal floral pattern, or changing the design according to festivals, sports events, product types, and product campaigns. Can be easily performed at low cost.

  In particular, if paper is used as the interior sheet 13 as in this embodiment, offset printing can be performed in a small lot and at a low cost when printing, so that it is possible to easily cope with design changes. Because it is possible to print in small lots, a wide variety of designs can be taken.

  The manufacturing method of this packaging container B is demonstrated with reference to FIG.

  I. As shown in the upper part of FIG. 4, the plastic sheet is provided with a large number of recesses 17 to form the outer and inner container shot sheets 11a and 12a, which are the bases of the outer and inner container bodies 11 and 12. In addition, although the recessed part 17 ... is correctly shape | molded in the step shape corresponding to the collar part 14, an opening edge part is shown as a simple recessed part here for simplification of a figure.

  II. The interior sheet 13 that has been separately printed, cut, and bent is inserted into each of the recesses 17 of the outer container body shot sheet 11a.

  III. The inner container shot sheet 12a is superposed on the outer container shot sheet 11a containing the interior sheet in a state where the recesses 17 are fitted to each other to form a three-layer sheet B ′.

  IV. Although not shown, the three-layer sheet B ′ is cut at a portion connecting the recesses 17 to obtain a container-like packaging container B having an open upper surface as shown in FIG.

  Thus, the three-layer shot sheet B ′ is formed by superposing the inner and outer container shot sheets 11a and 12a and the interior sheet 13 interposed between the recesses, with the recesses, and this three-layer shot sheet B Since the three-layered packaging container B is made by cutting the ′, it is rich in mass productivity and can be manufactured at low cost.

  By the way, the interior sheet 13 is preferably made of paper because it has a great merit such that offset printing is possible. However, a non-woven fabric rich in texture may be used, or a plastic film may be used.

  Further, if the interior sheet 13 is shaped like a container corresponding to the container B as in the above-described embodiment, there is an advantage that there is no displacement movement, but the interior sheet 13 may be a flat sheet piece.

  Further, the air layer 15 may be formed not only on the bottom wall but also on the entire side wall.

  On the other hand, the planar shape of the packaging container can be selected from a circle, an ellipse, various polygons, and the like.

It is a perspective view of the packaging container concerning embodiment of this invention. It is a disassembled perspective view of the container. It is a partial expanded sectional view of the container. It is a perspective view for demonstrating the manufacturing method of the container. It is a perspective view of the conventional packaging container. It is a perspective view for demonstrating the manufacturing method of the container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Outer container body 12 Inner container body 13 Interior sheet 15 Air layer 16 Air vent passage 17 Recessed part

Claims (9)

  A packaging container comprising an outer container body and an inner container body formed by molding a plastic sheet into a container shape, with an interior sheet interposed therebetween.   The packaging container according to claim 1, wherein the interior sheet is printed as a design process.   The packaging container according to claim 1 or 2, wherein paper is used as the interior sheet.   The packaging container according to any one of claims 1 to 3, wherein the interior sheet is cut and bent into a shape corresponding to the outer container body and the inner container body.   The packaging container according to any one of claims 1 to 4, wherein an air layer is formed inside a container peripheral wall constituted by the outer container body, the inner container body, and the interior sheet.   The packaging container according to claim 5, wherein the thickness of the air layer is set to 10 μm or more and 20 mm or less.   The packaging container according to any one of claims 1 to 6, wherein an air vent passage is formed between the peripheral walls of the outer container body and the inner container body so as to draw air to the outside when the two container bodies are fitted together. .   After forming a large number of recesses in the plastic sheet and molding the outer container shot sheet and the inner container shot sheet, and inserting the interior sheet into the recesses of the outer container shot sheet, both the container shot sheets are The three-layer shot sheet is configured by overlapping in a fitted state, and the three-layer shot sheet is cut at a portion connecting the respective recesses, whereby a container-shaped outer container body and inner container body having an upper surface opened A manufacturing method of a packaging container, characterized in that a large number of packaging containers made of an interior sheet interposed between the two container bodies are obtained.   The manufacturing method of the packaging container according to claim 8, wherein the interior sheet is cut and bent into a shape corresponding to the recess of the outer container body shot sheet, and the interior sheet is fitted into each recess of the outer container body shot sheet. A method for manufacturing a packaging container, wherein an inner container shot sheet is overlaid on the inside.

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