JP2005231665A - Container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container showing a superior productivity capable of reducing a blocking phenomenon when several containers are stacked up without applying any silicone oil and capable of smoothly supplying containers at a printing stage and the like. <P>SOLUTION: This container 1A has air feeding grooves 4 in its inner wall surface, and each of the air feeding grooves 4 keeps a lower end reaching an air reservoir formed at a clearance between the inner surface of a lower container and the outer surface of an upper container under an overlapped state of two containers, and its upper end communicating with the surrounding atmosphere. In this type of container of the present invention, it is preferable that the outer wall surface of the container is substantially flat curved surface. Further, in this type of container of the present invention, it is preferable that the container is formed by either a thermoplastic resin foamed sheet or a thermoplastic resin laminated sheet having a thermoplastic resin film laminated on the thermoplastic resin foamed sheet. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a container that can be removed smoothly without causing a blocking phenomenon when an upper container is removed from a state in which a large number of containers are stacked.

Expanded polystyrene-made containers are widely used as food containers for instant noodles such as instant noodles, instant pasta, and soup. Among these types of bowl-shaped containers, in the type of curved surface printing on the outer side wall of the container, in order to increase the printing range in the height direction, a geometrical step (for preventing fitting into the outer surface of the container ( The stack point is eliminated and the side wall is flat. Therefore, the side walls of the containers come into wide contact with each other when they are stacked, and a sealed space is created at the bottom between the containers, so that the upper container cannot be easily removed, so-called “fitting” or “ The “blocking phenomenon” occurs. Usually, in order to alleviate the fitting, use a molding sheet material with silicone oil applied to at least one side in advance, or apply silicone during the molding process of the container to improve the slipperiness of the container surface. ing.
Conventionally, for example, Non-Patent Document 1 and Patent Documents 1 and 2 are known regarding the fitting and blocking phenomenon of containers and the countermeasures against the phenomenon.

Non-Patent Document 1 describes a method and printing apparatus for performing curved surface printing on the outer surface of a cup container such as a plastic cup. In this non-patent document 1, in the case of a container shape that is pressure-bonded (blocked) in a state where the cups are stacked, it may not be possible to separate them one by one during high-speed operation, which is likely to occur in the case of PSP sheet molding It is described.
Patent Document 1 discloses a container in which a thermoplastic resin film composed of a single layer or a multilayer having a thickness of 5 to 550 μm is laminated on at least one surface of a polystyrene resin foam container main body, and the outer side of the laminated film. A container is disclosed wherein the layer film contains 0.01 to 3 weight percent silicone oil.
Patent Document 2 discloses a vertical cup-shaped food container comprising a polystyrene-based resin foam sheet and having a substantially U-shaped cross section, and a stack projectingly provided on the inner surface of the lower side wall of the container. Is disclosed.
Nobuo Keigo, Curved Printing Technology, Plastic Swage, May 1994, 120-124 JP-A-7-108637 JP-A-7-329948

However, the above-described conventional technique has the following problems.
In Non-Patent Document 1, in the case of a container shape that is pressure-bonded (blocked) in a state where the cups are stacked, the problem of being difficult to remove one by one is stopped, and how to solve this problem is described. It is not done.
The container described in Patent Document 1 has a problem that, when the resin and silicone oil are fed into the extruder and melt-mixed in the process of containing the silicone oil in the film, the bite fluctuation is likely to occur, and the condition adjustment takes time. There is.
In the vertical cup-shaped food container described in Patent Document 2, it is difficult to sharpen the mold reproducibility of all molded products in one shot in the molding of many pieces, and the sharp state is slightly damaged. If this happens, the fitting will occur. Moreover, there exists a problem that a container shape is limited to a vertical cup.
Furthermore, when silicone is applied during the molding process of the container, there are problems such as dropping of the silicone oil to be applied and occurrence of unevenness.

  The present invention has been made in view of the above circumstances, and aims to provide a highly productive container that can reduce the blocking phenomenon when the containers are stacked without using silicone oil and can smoothly supply the containers in a printing process or the like. And

In order to achieve the above object, the present invention is a container having an air introduction groove on an inner wall surface, and the air introduction groove has an inner surface of a lower container in a state where two containers are stacked. The container is characterized in that it reaches an air reservoir formed in the gap between the outer container and the outer surface of the upper container, and the upper end side communicates with the outside air.
In the container of the present invention, the outer wall surface of the container is preferably a substantially flat curved surface.
The container of the present invention preferably comprises a thermoplastic resin foam sheet or a thermoplastic resin laminate sheet obtained by laminating a thermoplastic resin film on a thermoplastic resin foam sheet.
In the container of the present invention, it is preferable that a single-layer or multilayer thermoplastic resin film is laminated on at least the outer wall surface of the container.
In the container of the present invention, the thermoplastic resin foam sheet is preferably a polystyrene resin foam sheet.

The container of the present invention is provided with an air introduction groove on the inner wall surface, and the air introduction groove is formed in the gap between the inner surface of the lower container and the outer surface of the upper container with the lower end side thereof being stacked. When the upper or lower container is sequentially removed from the stacked state, the air reservoir formed in the gap between the upper and lower containers is configured so that the upper end communicates with the outside air. Communicates with the outside air through the air introduction groove, and when the upper and lower containers are separated from each other, the air pool does not become depressurized and the blocking phenomenon can be reliably prevented, and the upper or lower container can be removed from the stacked state. It can be removed smoothly. Therefore, the container of the present invention can be individually supplied to the curved surface printing machine at a high speed, printing at a high speed is possible, and productivity can be improved.
In addition, by forming the outer wall surface of the container with a substantially flat curved surface, curved surface printing becomes easy, and the printing height can be raised close to the container height, so printing can be performed on almost the entire outer wall surface. Can be applied.
In addition, the blocking phenomenon can be prevented without using silicone oil, so the number of man-hours for manufacturing can be reduced compared to when silicone oil is applied to a sheet or molded container, and when silicone oil is used. Problems such as dropout and unevenness that occur can be solved.
In addition, by adopting a structure in which a single-layer or multilayer thermoplastic resin film is laminated on at least the outer wall surface of the container, the smoothness of the outer wall surface is improved, printability is improved, and more beautiful curved surface printing is possible. . .
Moreover, by forming with a polystyrene-type resin foam sheet, it is possible to provide a container having high foaming ratio, excellent heat insulation and strength, and good moldability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a first embodiment of the container of the present invention. This container 1A includes a thermoplastic resin foam sheet or a thermoplastic resin laminate sheet obtained by laminating a thermoplastic resin film on a thermoplastic resin foam sheet, from a disk-shaped bottom portion 2 and side wall portions 3 erected from the periphery thereof. This is characterized in that it is formed by forming a bowl shape, and two vertically long air introduction grooves 4 are formed on the inner wall surface thereof. The outer wall surface of the container 1A is formed with a substantially flat curved surface. By setting the outer peripheral surface to a flat curved surface, curved surface printing becomes easy, and the printing height can be increased to near the container height. The side wall 3 of the container 1A is formed with a flange 5 whose tip extends in the horizontal direction.

  Examples of the thermoplastic resin foam sheet used in the container 1A include foam sheets such as polystyrene resin foam sheets, polyethylene resin foam sheets, polypropylene resin foam sheets, and polyethylene terephthalate (PET) resin foam sheets. Among these foamed sheets, a polystyrene-based resin foamed sheet is preferable because it can provide a container with high foaming ratio, excellent heat insulation and strength, and good moldability. Polystyrene resins include styrene, methyl styrene, ethyl styrene, isopropyl styrene, dimethyl styrene, paramethyl styrene, chlorostyrene, bromostyrene, vinyl toluene, and vinyl xylene homopolymers or copolymers, such as styrene-anhydrous resins. A maleic acid copolymer, a styrene / acrylic acid copolymer, high impact polystyrene, a styrene / acrylonitrile resin, an acrylonitrile / butadiene-styrene resin, or the like can be used. Polystyrene resin is particularly preferable.

Examples of blowing agents used include propane, i-butane, n-butane, i-pentane, n-pentane, or mixtures thereof, and N ₂ , CO ₂ , N ₂ / CO ₂ , water, water and —OH. _{, -COOH, -CN, -NH 3,} -OSO 3 H, -NH, CO, NH 2, -CONH 2, -COOR, -CHSO 3 H, compounds having -SO 3 H, -COONH _4, the group And a mixture thereof. Of these, i-butane and n-butane are particularly preferred. Examples of organic foaming agents include foaming agents such as azodicarboxylic acid amide, dinitropentamethylenetetramine, and 4,4′-oxybis (benzenesulfonylhydrazide). Furthermore, a combination of an organic acid such as sodium bicarbonate or citric acid or a salt thereof and a bicarbonate can be used. Alternatively, for example, a combination of an organic acid such as sodium bicarbonate citric acid or a salt thereof and a bicarbonate can be used, and these can also be used by coating with a low molecular weight olefin, liquid paraffin or the like. Examples of inorganic carbon dioxide generators include alkali metal or alkaline earth metal carbonates or bicarbonates, as well as ammonium carbonate and ammonium bicarbonate. Of these, sodium bicarbonate is preferably used. These may be a mixture of two or more. All of these are available as powders. Weak acids mixed with this include oxalic acid, malonic acid, maleic acid, fumaric acid, succinic acid, itaconic acid, citraconic acid, adipic acid, formic acid, acetic acid, propionic acid, butyric acid, stearic acid, oleic acid, caprylic acid, Enatonic acid, caproic acid, valeric acid, lactic acid, tartaric acid, citric acid, phthalic acid, benzoic acid, benzenesulfonic acid, toluenesulfonic acid, chloroacetic acid, diglycolic acid and other organic acids, boric acid and other inorganic acids and acidic tartaric acid Examples thereof include acidic salts such as potassium, and citric acid is preferably used. These may be a mixture of two or more.

  The expansion ratio of this thermoplastic resin foam sheet is about 1.5 to 20 times. In forming the thermoplastic resin foam sheet, a commonly used compounding agent, for example, a cell regulator, a pigment, or the like may be added to the resin. The thickness of the original sheet of the foam sheet is not particularly specified, but it is sufficient that the foam sheet has a thickness suitable for a foam sheet for producing a normal container.

As the thermoplastic resin film laminated on the thermoplastic resin foam sheet, the above-mentioned polystyrene synthetic resin can be used. Besides, a mixture of polystyrene resin and high impact polystyrene or high impact polystyrene alone and Examples of the high-impact polystyrene include those in which a styrene-butadiene copolymer is dispersed in a salami structure and a particle size of 0.3 μm to 10 μm is included. In addition, linear low density polyethylene, high density polyethylene, low density polyethylene, propylene homopolymer, ethylene / propylene random polymer, ethylene / propylene block polymer, ethylene / propylene / butene / terpolymer, ethylene / vinyl acetate copolymer , Ethylene-unsaturated carboxylic acid ester copolymer (for example, ethylene-methyl methacrylate copolymer), ethylene-unsaturated carboxylic acid metal salt copolymer (for example, ethylene-magnesium acrylate (or zinc) copolymer) , Propylene-vinyl chloride copolymer, propylene-butene copolymer, propylene-maleic anhydride copolymer, propylene-olefin copolymer (propylene-ethylene copolymer, propylene-butene-1 copolymer) polyethylene or polyethylene Examples include propylene-modified unsaturated carboxylic acid (for example, maleic anhydride), ethylene-propylene rubber, atactic polypropylene, and the like, polyethylene, ethylene-propylene copolymer, propylene-butene-1 copolymer, and these two types. Examples thereof include films such as the above mixtures, polyethylene terephthalate, polybutylene terephthalate and the like.
In order to laminate the film on the foamed sheet, there are a method of coextruding the foamed sheet and the film and a method of laminating the film on the foamed sheet using a heating roll or an adhesive. Specifically, (1) the coextrusion method of extruding from a die after the foam sheet and film are merged and laminated, or (2) before the film extruded from the extruder is cooled down inline or outline A method of directly laminating on a foam sheet, or (3) a method of laminating a film (which may be plain or printed) on a foam sheet using in-line or outline resin extruded from an extruder as a binder. (4) A method of laminating a film (which may be plain or printed) on a foam sheet while being heated with a heating roll, and the like.

  The air introduction groove 4 is formed so that the lower end side in the longitudinal direction reaches the lower portion of the side wall portion of the inner surface of the container and the other end reaches the upper end of the container. Thus, with the two containers 1A stacked, the lower end side of the air introduction groove 4 reaches the air reservoir 6 formed in the gap between the inner surface of the lower container and the outer surface of the upper container, and the upper end side communicates with the outside air. It has become. In this example, two air introduction grooves 4 are provided opposite to the circumference of the inner wall surface of the container 1A, but the number of grooves is not limited to this. In addition, the code | symbol 8 is a draft line used as a standard of the injection | pouring amount of hot water provided as needed, when using this container 1A as a container for instant noodles etc. in FIG.

  FIG. 2 is a cross-sectional view showing a state in which two containers 1A are overlapped. When removing two containers 1A from a state where they are overlapped, in a conventional container in which no air introduction groove is provided on the inner wall surface, between the inner side of the lower container 1A and the outer lower part of the upper container 1A. The formed air reservoir 6 is depressurized, and fitting (blocking phenomenon) occurs, making it difficult to remove the upper and lower containers 1A. On the other hand, in the container 1A of the present invention in which the air introduction groove 4 is provided on the inner wall surface, as shown in FIG. 2, the air formed between the inner side of the lower container 1A and the outer lower part of the upper container 1A. Since the reservoir 6 communicates with the outside air through the air introduction groove 4, when the upper and lower containers 1A are removed, the air 7 is introduced into the air reservoir 6 through the air introduction groove 4, and the air reservoir 6 is not decompressed. The resistance when removing the container 1A is reduced, and the container 1A can be removed smoothly.

  FIG. 3 is a cross-sectional view of a main part illustrating the groove shape of the air introduction groove 4 formed on the inner wall surface of the container 1A. The groove shape of the air introduction groove 4 is not particularly limited. For example, the groove cross-sectional shape is square as shown in FIG. 3A, or the groove cross-sectional shape is trapezoidal as shown in FIG. 3B. Alternatively, as shown in FIG. 3C, the groove cross-sectional shape is preferably an arc shape. The width of the air introduction groove 4 is not particularly limited, but is usually preferably in the range of 1 to 15 mm. Further, the recess depth X of the air introduction groove 4 is preferably in the range of 15 to 75% of the thickness of the side wall portion 3 of the container 1A, and is usually preferably in the range of 0.5 to 1.5 mm. If the width or dent depth X is less than the above range, it is difficult to introduce the air 7 and the container 1A cannot be removed smoothly. When the above range is exceeded, it is difficult to apply printing pressure during curved surface printing, and printability may be reduced.

The container 1A of the present embodiment is provided with an air introduction groove 4 on the inner wall surface, and the air introduction groove 4 has a lower end side in which two containers 1A are stacked, and the inner and upper containers of the lower container 1A. When the upper or lower container 1A is sequentially removed from a state where a plurality of containers 1A are stacked, the air reservoir 6 reaches the air reservoir 6 formed in the gap with the outer surface of 1A and the upper end side communicates with the outside air. The air reservoir 6 formed in the gap between the containers 1A communicates with the outside air through the air introduction groove 4, and the air reservoir 6 does not become depressurized when the upper and lower containers 1A are separated from each other. This can be surely prevented, and the upper or lower container 1A can be smoothly removed from the stacked state of the plurality of containers 1A. Accordingly, the container 1A can be individually supplied to the curved surface printing machine at a high speed, can be printed at a high speed, and productivity can be improved.
Also, by forming the outer wall surface of the container 1A with a substantially flat curved surface, curved surface printing becomes easy, and the printing height can be increased to near the container height, so that printing can be performed on almost the entire outer wall surface. Can be applied.
In addition, the blocking phenomenon can be prevented without using silicone oil, so the number of man-hours for manufacturing can be reduced compared to when silicone oil is applied to a sheet or molded container, and when silicone oil is used. Problems such as dropout and unevenness that occur can be solved.
In addition, at least the outer wall surface of the container 1A is configured by laminating a single-layer or multilayer thermoplastic resin film, so that the smoothness of the outer wall surface is improved, printability is improved, and more beautiful curved surface printing is possible. Become. .
Moreover, by forming with a polystyrene-based resin foam sheet, it is possible to provide a container 1A that has high foaming ratio, excellent heat insulation and strength, and good moldability.

FIG. 4 is a perspective view showing a second embodiment of the container of the present invention. The container 1B is configured to include substantially the same components as the container 1A of the first embodiment described above, and the same components are denoted by the same reference numerals.
The container 1B of this embodiment is different from the container 1A of the first embodiment in that twelve air introduction grooves 4 are provided on the inner wall surface of the container 1B.

  FIG. 5 is a cross-sectional view showing a state in which two containers 1B are overlapped. When removing two containers 1B from a state where two containers 1B are overlapped, the air reservoir 6 is depressurized in a conventional container having no air introduction groove on the inner wall surface, and fitting (blocking phenomenon) occurs, resulting in upper and lower containers. It becomes difficult to remove 1A. On the other hand, in the container 1B provided with the air introduction groove 4 on the inner wall surface, as shown in FIG. 5, there is an air reservoir 6 formed between the inner side of the lower container 1B and the outer lower part of the upper container 1B. Since the air is communicated with the outside air through the air introduction groove 4, when the upper and lower containers 1B are removed, the air 7 is introduced into the air reservoir 6 through the air introduction groove 4, and the air reservoir 6 is not depressurized. The resistance at the time of removal becomes small, and the container 1B can be removed smoothly.

  The container 1B of the present embodiment can obtain the same effect as the container 1A of the first embodiment described above, and further, the effect of preventing fitting (blocking phenomenon) by increasing the number of the air introduction grooves 4. Is more certain.

FIG. 6 is a perspective view showing a third embodiment of the container of the present invention. The container 1C is configured to include substantially the same components as the container 1A of the first embodiment described above, and the same components are denoted by the same reference numerals.
The container 1C of this embodiment is different from the container 1A of the first embodiment in that twelve air introduction grooves 4 are provided on the inner wall surface of the container 1C, and that the upper part of the container inner wall from the water line 8 and the air introduction groove are provided. The thickness of 4 is made thinner than the thickness of the other side wall 3.

  FIG. 7 is a cross-sectional view showing a state in which two containers 1C are overlapped. When removing two containers 1C from a state in which they are stacked, the air reservoir 6 is depressurized in a conventional container having no air introduction groove on the inner wall surface, and fitting (blocking phenomenon) occurs, resulting in upper and lower containers. It becomes difficult to remove 1A. On the other hand, in the container 1C in which the air introduction groove 4 is provided on the inner wall surface, as shown in FIG. 7, there is an air reservoir 6 formed between the inside of the lower container 1C and the outer lower part of the upper container 1C. Since air is communicated with the outside air through the air introduction groove 4, when the upper and lower containers 1C are removed, the air 7 is introduced into the air reservoir 6 through the air introduction groove 4, and the air reservoir 6 is not depressurized. The resistance at the time of removal becomes small, and the container 1C can be removed smoothly.

  The container 1C of the present embodiment can obtain the same effects as the container 1A of the first embodiment described above, and further, the effect of preventing fitting (blocking phenomenon) by increasing the number of the air introduction grooves 4. Is more certain.

FIG. 8 is a view for explaining an example of the container manufacturing method according to the present invention. In this example, a pair of male and female molds shown in FIG. 8 is used, and the twelve air introduction grooves 4 shown in FIG. The case where the container 1B which has is shown is shown.
In this example, a male mold 11 having a female mold 9 provided with a concave portion 10 that matches the outer surface shape of the container 1B to be molded and a male mold 11 provided with a convex portion 12 that matches the inner surface shape of the container to be molded is used. Twelve protrusions 13 for forming the air introduction groove 4 are formed on the outer peripheral surface of the projection 12.

  In order to mold the container 1B using this pair of male and female molds, a thermoplastic resin foam sheet or a thermoplastic resin laminated sheet obtained by laminating a thermoplastic resin film on a thermoplastic resin foam sheet is heated and softened in a heating furnace. After that, the sheet is placed between the female mold 9 and the male mold 11 which are separated from each other, the mold is closed, and the sheet is formed by sandwiching the sheet between the concave portion 10 and the convex portion 12. Thus, by forming the air introduction groove 4 at the time of forming the container, the air introduction groove 4 having a sharp shape can be formed without increasing the number of steps. After forming, the container 1B is manufactured by taking out the sheet and cutting the container portion. It is not necessary to apply silicone oil to the manufactured container 1B in order to prevent fitting (blocking phenomenon) when many containers 1B are stacked.

Each embodiment mentioned above is only illustration of the present invention, and the present invention is not limited to these, and various changes are possible.
For example, in each said embodiment, although containers 1A-C produced using the thermoplastic resin foam sheet or the thermoplastic resin laminated sheet which laminated the thermoplastic resin film on the thermoplastic resin foam sheet are illustrated, It can also be applied to a container in which a material, for example, a non-foamed thermoplastic resin sheet (polystyrene resin sheet, polyethylene resin sheet, polypropylene resin sheet, polyethylene terephthalate resin sheet, etc.) is molded.
The shape of the container is not limited to a bowl shape, and can be applied to containers of various shapes such as a vertically long cup shape, a tray shape, a rectangular container, a semicircular shape in plan view, and a crescent shape.
Hereinafter, the effects of the present invention will be demonstrated by examples.

[Example 1]
As the base material of the container, it is made of a polystyrene-based resin foam sheet, and a high-impact polystyrene-based resin (E-640N, manufactured by Toyo Styrene Co., Ltd.) is melted with an extruder on the outer surface side, and extruded and laminated in a film form from a T-die. Using the obtained polystyrene-based resin molded sheet, a bowl-shaped container having a diameter of 145 mm and a depth of 75 mm was manufactured. On the inner wall surface of the container, two air introduction grooves having a width (container circumferential direction) of 7 mm and a depth of 1 mm, as shown in FIG. 1, reach the air reservoir formed when the containers are stacked from the container mouth. Provided.
Silicone oil was not applied during the container manufacturing process.
Several containers were piled up, the resistance at the time of removal was evaluated sensuously, and the prevention of fitting was evaluated. The results are shown in Table 1.

<Fitting prevention>
Several containers were overlapped, and the resistance when removing the upper container was sensorially evaluated according to the following evaluation criteria.
○: The container can be easily removed.
Δ: There is a little resistance when removing the container.
X: When removing the container, there is considerable resistance, and removal is difficult.

<Degree of manufacturing man-hour reduction>
The case where the silicone oil was not applied in the container manufacturing process was marked with ◯, and the case where the silicone coating was overworked was marked with ×.

[Example 2]
A container having the shape shown in FIG. 4 was obtained in the same manner as in Example 1 except that the number of air introduction grooves formed on the inner wall surface of the container was twelve.
Silicone oil was not applied during the container manufacturing process.
Several containers were piled up, the resistance at the time of removal was evaluated sensuously, and the prevention of fitting was evaluated. The results are shown in Table 1.

[Comparative Example 1]
A container was obtained in the same manner as in Example 1 except that no air introduction groove was provided on the inner surface of the container.
Silicone oil was not applied during the container manufacturing process.
Several containers were piled up, the resistance at the time of removal was evaluated sensuously, and the prevention of fitting was evaluated. The results are shown in Table 1.

[Comparative Example 2]
A container was obtained in the same manner as in Example 1 except that no air introduction groove was provided on the inner surface of the container.
Silicone oil was applied during the container manufacturing process.
Several containers were piled up, the resistance at the time of removal was evaluated sensuously, and the prevention of fitting was evaluated. The results are shown in Table 1.

From the results shown in Table 1, the containers of Examples 1 and 2 in which the air introduction groove was provided on the inner wall surface, from the state where a plurality of containers were stacked up or down, without applying silicone oil in the container manufacturing process. When removing the container on the side, the container could be removed smoothly, and the prevention of fitting was good.
In addition, the containers of Examples 1 and 2 were not coated with silicone oil during the container manufacturing process, so the number of manufacturing steps was reduced and the reduction in manufacturing steps was also good.
On the other hand, the container of Comparative Example 1 in which the air introduction groove is not provided on the inner wall surface does not perform application of silicone oil in the container manufacturing process, so the manufacturing man-hour reduction degree is ○, but the air introduction groove is not provided. When removing the container on the upper side or the lower side from a state where a plurality of containers were stacked, the fitting occurred and the removal could not be performed smoothly, and the fitting prevention property was x.
Similarly, the container of Comparative Example 2 in which the silicone oil is applied without providing the air introduction groove on the inner wall surface is removed when the upper or lower container is removed from the stacked state of the containers. Although the slippage was improved, the fitting prevention property was insufficient as compared with Examples 1 and 2, and the fitting prevention evaluation was Δ. In Comparative Example 2, since the silicone oil was applied in the container manufacturing process, the manufacturing man-hour increased and the manufacturing man-hour reduction degree was x.

It is a perspective view which shows 1st Embodiment of the container of this invention. It is sectional drawing which shows the state which piled up the container of 1st Embodiment. It is principal part sectional drawing which illustrates the shape of an air introduction groove | channel. It is a perspective view which shows 2nd Embodiment of the container of this invention. It is sectional drawing which shows the state which piled up the container of 2nd Embodiment. It is a perspective view which shows 3rd Embodiment of the container of this invention. It is sectional drawing which shows the state which piled up the container of 3rd Embodiment. It is a schematic block diagram of the shaping | molding die explaining an example of the manufacturing method of the container which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B, 1C ... Container, 2 ... Bottom part, 3 ... Side wall part, 4 ... Air introduction groove, 5 ... Flange, 6 ... Air reservoir, 7 ... Air, 8 ... Waterline, 9 ... Female type, 10 ... Recessed part, 11 ... male mold, 12 ... convex, 13 ... projection.

Claims (5)

  An air introduction groove is provided on the inner wall surface, and the lower end side of the air introduction groove is formed in a gap between the inner surface of the lower container and the outer surface of the upper container in a state where two containers are stacked. A container that reaches the air reservoir and has an upper end that communicates with outside air.   The container according to claim 1, wherein the outer wall surface of the container is a substantially flat curved surface.   The container of Claim 1 or 2 which consists of a thermoplastic resin laminated sheet which laminated the thermoplastic resin film on the thermoplastic resin foam sheet or the thermoplastic resin foam sheet.   The container in any one of Claims 1-3 by which the single layer or the multilayer thermoplastic resin film is laminated | stacked on the outer wall surface of the container at least. The container according to claim 3 or 4, wherein the thermoplastic resin foam sheet is a polystyrene resin foam sheet.

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