JP2019001533A - Adhesion method for food container - Google Patents

Abstract

To provide an adhesin method for a food container capable of easily and reliably adhering a lid body to a container body and also easily peeling off the lid body from the container body.SOLUTION: In a food container 1 having a container body 2 and a lid body 3 to be covered on the container body 2 and having a seal layer 10 of a heat welding type formed on at least one of the container body 2 and the lid body 3, a food 4 is placed in the container body 2 and the lid 3 is covered thereon and the seal head 13 heated to 160 to 200°C is pressed against the lid body 3 at a pressure of 145 to 195 kg/cmfor 1.3 to 2.8 seconds to the container body 2 and the lid body 3 to seal the food container 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for adhering a food container, and in particular, adhering a container main body and a lid for a food container suitable for use in a food store suitable for being put in a food and sealed and sold in a retail store such as a supermarket or a convenience store. It is about the method.

  The thing of patent document 1 is known as such a food container. This has a container main body and a lid that covers the container main body, and in a container that heats the contents accommodated in the container main body while covering the lid, the container main body and the container The container body and the lid body are bonded and sealed to at least one of the lid bodies, and a seal layer that can easily peel off the adhesion between the container body and the lid body is formed. It is a container (see claim 1 of Patent Document 1).

  According to the container, “Because the container body and the lid can be sealed with a sealing layer, it is not necessary to wrap the container with a wrap, and the lid is firmly fixed to the container body. Therefore, the lid does not come off during transport, storage, display, etc. In addition, the liquid contents contained in the contained contents do not leak out. Since it does not have to be packaged, it is said that there is an advantage such as “the container body and the lid do not deform even when heated in a microwave oven” (see paragraph 0009 of Patent Document 1).

  In addition, the container is characterized in that the seal layer adheres and seals the container body and the lid by heat welding (see claim 3 of Patent Document 1), the lid or the container. The main body is formed by forming the seal layer on a part or all of the surface of the sheet-like resin material and then forming it into a predetermined shape by thermoforming (see claim 5 of Patent Document 1), The feature that at least one of the container main body and the lid body is transparent (see claim 9 of Patent Document 1), and that the lid body formed transparently or the inner surface of the container main body is subjected to an antifogging treatment It also has a feature (see claim 11 of Patent Document 1).

JP 2003-231540 A

  In such a container, it is necessary that the lid can be easily and reliably adhered to the container body, and that the lid can be easily peeled off from the container body. However, in the above-described conventional container, it is a constituent requirement that “the container body and the lid are bonded and sealed, and a seal layer that can easily peel off the adhesion between the container body and the lid” is formed. Specifics on how to achieve easy and reliable adhesion of the lid to the container body, and how to achieve ease of peeling of the lid from the container body There is no description or suggestion of the general composition.

  The present invention intends to propose a method for adhering a food container, in which the lid can be easily and reliably adhered to the container body, and the lid can be easily peeled from the container body.

In order to solve the above-mentioned problem, the method for adhering a food container according to the present invention of claim 1 includes a container body and a lid that covers the container body, and at least one of the container body and the lid. In the food container, the container main body and the lid body are bonded and sealed, and a heat-welding type sealing layer capable of peeling off the adhesion between the container main body and the lid body is formed. The food is put on and covered with the lid, and the seal head heated to 160 to 200 ° C. is pressed against the lid at a pressure of 145 to 195 kg / cm ² for 1.3 to 2.8 seconds, The food container is sealed by heat-welding the container body and the lid.

  According to the present invention of claim 1, by setting the temperature, pressing force and pressing time of the seal head within the above ranges, the lid can be easily and reliably adhered to the container body, and the lid from the container body. Can be easily peeled off.

  According to a second aspect of the present invention, there is provided the method for adhering a food container according to the first aspect of the present invention, wherein the heat welding portion is cooled after the container main body and the lid are heat welded. .

  According to this invention of Claim 2, the sealing performance of a food container and the easy peelability of a cover body improve further by cooling of a heat welding part.

  The method for adhering a food container according to the present invention of claim 3 is the method according to claim 1 or 2, wherein the container body has mutual adhesion at the time of heat welding by projecting to the lid body side. It is characterized by forming a raised ridge.

  According to this invention of Claim 3, the adhesiveness of the container main body and a cover body at the time of heat welding improves by the protrusion formed in a container main body. Therefore, the heat welding by the seal layer is easily and reliably performed by heating the protrusions for bonding. Moreover, since the heat welding by the seal layer is performed around the protrusion portion, the lid body can be easily peeled off from the container main body.

  According to a fourth aspect of the present invention, there is provided the method for bonding a food container according to the first, second, or third aspect, wherein the lid body has an upward convex covering portion and an opening peripheral edge of the covering portion. And at least the covering portion of the lid body is transparent and has an antifogging property.

  According to the fourth aspect of the present invention, since the lid is a raised lid, the capacity of the food container is increased. Therefore, a large content can be stored clearly. The raised lid also has the advantage of improving the design of the food container. Furthermore, since at least the covering portion of the lid is transparent and has antifogging properties, the contents are highly visible.

  The method for adhering a food container according to the present invention of claim 5 is the method according to claim 1, 2, 3 or 4, wherein the container body and the container body are placed when the container body is covered with the lid. A positioning projection located on the inner side of the opening periphery of one of the lids is formed on either one of the container body and the lid.

  According to the fifth aspect of the present invention, the positioning projection exerts a positioning action when the container body is covered with the lid, so that the operation of covering the container body with the lid can be performed easily and accurately.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of a food container to which a food container bonding method according to an embodiment of the present invention is applied in a state where a container body and a lid are separated. In the food container of FIG. 1, it is the whole perspective view of the state which put the cover body on the container main body. It is sectional drawing which shows the process of sealing the food container of FIG. 2 with a heat seal apparatus. It is an enlarged view of the IV arrow part of FIG. It is an enlarged view of the state after performing heat welding with respect to FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a food container 1 to which a food container bonding method according to an embodiment of the present invention is applied. As shown in this figure, the food container 1 has a container main body 2 that accommodates the food 4 and a lid 3 that covers the container main body 2.

  The container main body 2 has a concave food container 5 and a flange 6. The flange portion 6 is formed integrally with the opening peripheral edge 5 a of the food container 5, and projects outward from the food container 5. The flange portion 6 of the container body 2 is heat-welded to a flange portion 7 of the lid 3 described later. The container body 2 is entirely formed of a plastic sheet such as nylon, polypropylene, polyethylene, or polyethylene terephthalate. The wall thickness of the container body 2 is, for example, about 0.45 to 1.00 mm. As a method for forming the container body 2, for example, a vacuum / pressure forming method or a vacuum forming method is applied to a plastic sheet using a mold. Further, the container body 2 can be formed by an injection molding method.

  As shown in FIGS. 3 and 4, the flange portion 6 of the container body 2 is formed with a ridge 6 a that protrudes upward (on the lid 3 side) to enhance mutual adhesion during heat welding. . As shown in FIG. 1, the protrusion 6 a surrounds the food container 5 along the flange portion 6. As the cross-sectional shape of the protrusion 6a, various shapes such as a mountain shape, a trapezoidal shape, and a dome shape can be adopted. If the recess corresponding to the protrusion 6a is formed in the mold for molding the container body, the protrusion 6a can be simultaneously formed on the flange portion 6 when the container body 2 is molded.

  The lid 3 is a raised lid having an upwardly convex covering portion 8 and a flange portion 7. The flange portion 7 is integrally formed with the opening peripheral edge 8 a of the covering portion 8 and projects outside the covering portion 8. As shown in FIG. 2, when the lid 3 is put on the container body 2, the flange portions 6 and 7 overlap each other. The entire lid 3 is formed of a plastic sheet such as polypropylene, polyethylene terephthalate, or polystyrene. The thickness of the lid 3 is, for example, about 0.2 to 0.4 mm. Similarly to the container body 2, the lid 3 may be formed by applying a vacuum / pressure forming method or a vacuum forming method to a plastic sheet using a mold.

  As shown in FIG. 3, in the lid 3, it is preferable to form a downward projecting positioning projection 9 between the covering portion 8 and the flange portion 7. The protrusion 9 is positioned on the inner side of the opening periphery 5a of the food container 5 of the container body 2 when the container body 2 is covered with the lid body 3, thereby positioning the lid body 3 with respect to the container body 2. Play. For this reason, the operation | work which covers the cover body 3 on the container main body 2 can be performed easily and correctly. Although not shown, contrary to the above, the positioning protrusion 9 may be formed between the food container 5 and the flange 6 of the container body 2 so as to protrude upward. Of course it is good. In this case, when covering the container body 2 with the lid 3, the positioning projection 9 of the container body 2 is positioned inside the opening peripheral edge 8a of the covering 8 of the lid 3, The positioning effect | action of the cover body 3 with respect to the container main body 2 is show | played. The positioning protrusion 9 may be provided so as to make a round along the peripheral edge of the opening of the lid 3 or the container body 2 or may be provided partially.

  Although not limited, it is preferable that at least the covering portion 8 of the lid 3 is transparent and has antifogging properties. In order to impart antifogging properties, an appropriate antifogging agent may be mixed into the plastic that is the main body of the lid 3 when the plastic sheet that is the base of the lid 3 is formed. Further, the antifogging can be imparted by applying an appropriate antifogging agent to at least the inside of the covering portion 8 of the lid 3.

  Any anti-fogging agent can be used as long as it has an anti-fogging effect. Typically, it is a fatty acid ester of a polyhydric alcohol, its ethylene oxide adduct, an ethylene oxide adduct of a higher fatty acid amine, a higher fatty acid. Examples thereof include alkanolamides, and these can be used alone or in combination of two or more if necessary. In addition, glycerin fatty acid ester, monoglyceride, organic acid monoglyceride, polyglycerin fatty acid ester, sorbitan fatty acid ester, and the like can also be used as an antifogging agent.

  As shown in FIGS. 3 and 4, a seal layer 10 is formed on at least the lower surface of the flange portion 7 of the lid 3. This seal layer 10 is for heat-welding the lid 3 to the container body 2. Therefore, the sealing layer 10 should just be formed in at least any one of the lower surface of the flange part 7 of the cover body 3, and the upper surface of the flange part 6 of the container main body 2 at least. In the example of FIG. 3, the seal layer 10 is formed on the entire inner surface of the lid 3.

  The seal layer 10 seals the food container 1 by adhering the flange portions 6 and 7 of the container body 2 and the lid body 3, and facilitates adhesion of the flange portions 6 and 7 when taking out the food 4 inside. Adhesive strength that can be peeled off. The seal layer 10 is a so-called heat seal type seal layer that bonds the flange portions 6 and 7 together by heating at a predetermined temperature. As the material of the sealing layer 10, for example, stretched polypropylene, non-stretched polypropylene, polypropylene, polyethylene, and the like can be used, and each of these materials is used alone or in combination with a plurality of materials selected from these materials. be able to. The thickness of the seal layer 10 is, for example, about 25 to 70 μm. The sealing layer 10 may be formed by sticking to the surface of the plastic sheet that is the base of the lid 3, or a co-extrusion capable of laminating a plurality of thin films when molding the plastic sheet that is the base of the lid 3. It can also be formed by the method.

  As shown in FIG. 3, according to the present embodiment, when the lid 3 is put on the container body 2, the flange portions 6 and 7 overlap each other. Since the lid 3 is a raised lid, the capacity of the food container 1 is increased. Therefore, the big contents 4 can be accommodated clearly. By using the lid 3 as a raised lid, the design of the food container 1 is improved, and the appearance of the food 4 inside is improved. The cross-sectional shape of the lid 3 may be a dome shape in addition to the trapezoidal shape as in the example of FIG. Moreover, it becomes easy to visually recognize the food 4 inside the food container 1 by making at least the covering part 8 of the lid 3 transparent, and it stands up from the food 4 by giving at least the covering part 8 anti-fogging property. It is possible to prevent the inside of the covering portion 8 from being fogged by steam. Therefore, it can contribute to arousing consumers' purchasing motivation.

  Using the heat seal device 11 illustrated in FIG. 3, the overlapping flange portions 6 and 7 of the container body 2 and the lid body 3 are heat-welded. Thereby, the food container 1 is sealed and the food 4 inside is protected. Moreover, the freshness of the foodstuff 4 is hold | maintained by substituting the inside of the food container 1 with an inert gas at the time of heat welding, and the expiration date of the foodstuff 4 can be extended. Furthermore, by sterilizing the entire food container 1 after heat welding, the freshness of the food 4 is maintained longer, and the expiration date of the food 4 can be further extended.

  The heat seal device 11 includes a seal base 12 that supports the flange portions 6 and 7 of the food container 1 from below, and a seal head 13 that heats the flange portions 6 and 7 of the food container 1 between the seal base 12. And a crimping cylinder 14 that drives the seal head 13 up and down in the direction of approaching and separating from the seal base 12.

  In the heat welding (heat seal), the food body 4 is put in the container body 2 and the lid 3 is covered, and the overlapping flange portions 6 and 7 of the food container 1 are placed on the seal base 12 of the heat seal device 11. Then, the crimping cylinder 14 is operated, and the seal head 13 heated to a predetermined temperature is pressed against the flange portions 6 and 7 on the seal base 12 with a predetermined pressure for a predetermined time. As a result, as shown in FIG. 5, the seal layer 10 is melted or softened by the heat of the seal head 13, and the flange portions 6 and 7 of the container body 2 and the lid 3 are bonded to each other. When the pressing time of the seal head 13 reaches a predetermined time, the seal head 13 is raised by the crimping cylinder 14.

  In the present embodiment, a protrusion 6 a that protrudes upward is formed on the flange portion 6 of the container body 2. For this reason, in the mutual adhesion state of the flange portions 6 and 7 of the container body 2 and the lid body 3, as shown in FIG. 5, the melted or softened seal layer 10 is formed on the protrusion 6 a of the flange portion 6 of the container body 2. Positioned as seal reservoirs 10a and 10b on both sides, the container body 2 and the flange portions 6 and 7 of the lid 3 are firmly bonded to each other. Thereby, the food container 1 is tightly sealed.

Conventionally, in sealed cup-shaped products such as pudding and jelly, when the lid is covered with a film by heat welding using a heat seal device, the cup-shaped container body, from the viewpoint of increasing the efficiency of the heat welding process, It was usual to perform heating at a high pressure for a short time. On the other hand, according to the experiment by the inventors of the present invention, the container body 2 is set by setting the temperature and the pressing force of the seal head 13 low and setting the pressing time of the seal head 13 long. It turned out that the sealing performance and easy peelability (easy opening property) between the lid 3 and the lid 3 are improved. Specifically, the temperature of the seal head 13 is preferably 160 to 200 ° C., the pressing force of the seal head 13 is preferably 145 to 195 kg / cm ² , and the pressing time of the seal head 13 is 1.3 to 2.8 seconds. It is preferable to do this. More preferably, the temperature of the seal head 13 is 172 to 188 ° C., the pressing force of the seal head 13 is 145 to 175 kg / cm ² , and the pressing time of the seal head 13 is 1.3 to 2.3 seconds. Furthermore, when heat sealing under the above conditions is performed twice on the same food container 1, the sealing property and easy peelability between the container body 2 and the lid body 3 are further improved, which is preferable. is there.

  Immediately after the container body 2 and the lid 3 are heat-welded as described above, the heat-welded portion 15 (see FIG. 5) is cooled (rapidly cooled). Since the lid 3 is formed of a plastic sheet, it is particularly important to cool after heat welding, unlike the case of film sealing. Although not shown, the heat welding unit 15 can be suitably cooled by providing the heat seal device with a cooling head that is driven up and down by a cooling cylinder. After completion of the heat welding process, the cooling cylinder is operated to press the cooling head against the heat welding portion 15 of the food container 1. Thereby, the heat-welded part 15 of the food container 1 is rapidly cooled, and the seal reservoirs 10a and 10b are solidified, so that the sealing performance between the container body 2 and the lid 3 is further improved.

  When heat welding is performed under the conditions as described above, and the heat welding portion 15 is cooled immediately thereafter, adhesion between the container body 2 and the lid 3 is surely and easily performed, and when the food 4 inside is taken out. In addition, the adhesion between the container body 2 and the lid 3 could be easily peeled off.

  In addition, as shown in FIG. 2, one or more tongue-shaped projections 16 that are non-adhesive portions are formed on the corners of the lid 3, etc., and a clue to peel off the adhesion between the flange portions 6 and 7; It is preferable.

DESCRIPTION OF SYMBOLS 1 Food container 2 Container main body 3 Cover body 4 Food 5 Food storage part 6 Flange part 6a protrusion 7 Container flange part 8 Cover part 9 Covering part 9 Positioning protrusion 10 Seal layer 11 Heat seal apparatus 12 Seal stand 13 Seal head 15 Heat welding part

Claims (5)

A container body and a lid that covers the container body, and the container body and the lid body are adhered and sealed to at least one of the container body and the lid body, and the container body and the lid In a food container in which a heat-welding type sealing layer that can peel off the adhesion to the lid is formed, food is put in the container body, the lid is covered, and a seal head heated to 160 to 200 ° C is provided. The food container is sealed by heat-welding the container body and the lid body by pressing against the lid body at a pressure of 145 to 195 kg / cm ² for 1.3 to 2.8 seconds. And a method for adhering food containers.   The method for bonding a food container according to claim 1, wherein the heat-welded portion is cooled after the container body and the lid are heat-welded.   The method for adhering a food container according to claim 1 or 2, wherein protrusions that enhance mutual adhesion at the time of heat welding are formed on the container body by projecting toward the lid.   The lid body is a raised lid having an upwardly convex covering portion and a flange portion integrally formed on the periphery of the opening of the covering portion, and at least the covering portion of the lid body is transparent and prevents The method for adhering food containers according to claim 1, 2 or 3, wherein the food container has a cloudiness.   When the lid is put on the container main body, a positioning projection located on the inner side of the opening periphery of either the container main body or the lid is provided on the other of the container main body and the lid. The method for adhering a food container according to claim 1, 2, 3, or 4, wherein the method is formed.

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