JPH0924972A - Sealed container including food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve openability and prevent a lid from curling by adhering aluminum alloy foils to both upper and lower faces of a polyester film respectively having specific thickness and by heat-sealing a lid equipped with a heat-sealed layer on a lower face of the lower face aluminum alloy foil to a synthetic resin container. SOLUTION: Pudding 2 for example is put into a container 1 made of polystyrol resin, and a lid 3 is heat-sealed 4 to an upper opening peripheral rim of the container 1 to seal the upper opening of the container 1. In such a sealed container 5, the lid 3 is formed by adhering aluminum alloy foils as thick as 15 to 25μm to both upper and lower faces of a polyester film 6 as thick as 6 to 12μm and providing a heat-sealed layer 11 coated by 1 to 10μm on a lower face of the lower face aluminum alloy foil 9. Thus the sealed container 5 can be relatively easily opened, while a load to be applied to a cutter blade when a sheet-like lid material is cut into a lid shape is reduced to lengthen the service life of the cutter blade.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to purines, jellies,
The present invention relates to a hermetically sealed hermetically-sealed container containing food, which is obtained by heat-sealing a lid of a container containing food such as a beverage.

[0002]

2. Description of the Related Art A conventional food-sealed container is, for example, a synthetic resin container sterilized with hydrogen peroxide by using a commercially available aseptic filling machine and the lid is sterilized with hydrogen peroxide. Is heat-sealed to the horizontal wall of the opening edge of the synthetic resin container. Then, as the lid, a synthetic resin film having a thickness of about 12μ to about 16μ adhered to the upper surface of a thick aluminum foil having a thickness of about 30μ to about 50μ is provided, and an adhesive is applied to the lower face of the aluminum foil. Generally, a heat-sealing layer of a heat-sealable synthetic resin film having a large thickness of about 20 μm to about 30 μm is provided. Thus, the food contained in the hermetically-sealed sealed container is kept in good condition for a long period of time after being manufactured even at room temperature.

[0003]

In this conventional food-sealed container, the heat-sealing synthetic resin film is about 20.
Since the thickness is as thick as μ to about 30 μ, there is a problem that the cutter blade has a short life because a heavy load is applied to the blade of the cutter when it is pulled out from the coil-shaped lid material by a cutter and punched into a lid shape. Further, since the lid is a composite material of a heat seal layer of a thick heat sealable synthetic resin film, a thick aluminum foil and a synthetic resin film, the thick heat sealable synthetic resin film and the aluminum foil pressurize when embossing. Since the curl of the lid becomes large due to the difference in elongation due to the force, there is a problem in that when the lid is suctioned by suction, two lids may be sucked at the same time, or the lid may not be sucked by suction. After the lid is sterilized with hydrogen peroxide, high-temperature air is directly applied to the lid during the drying process. The lid is made up of a thick heat-sealing synthetic resin film. Therefore, it is said that the lid and the container are heat-sealed in a state where the lid and the container are misaligned without being placed on the predetermined position of the container There is a problem. Further, when the sealed container containing the sealed food is opened, since it is strongly heat-sealed by the heat-sealing layer of a thick film, the sealing strength is extremely high, and there is a problem that the opening is extremely difficult.

The present invention solves these problems of the conventional food-sealed container, makes it easier to open the food-sealed container, and prevents the lid from curling as much as possible when embossing. , The cutter blade can be used for a long time when punching a large sheet-shaped lid material and cutting it into the shape of the lid, the lid can be smoothly sucked when sucking the lid to cover the container, and the heat of the lid The purpose of the sealing layer is to reduce the difference in elongation due to heating as much as possible in the drying process after sterilization so that the lid does not curl further and sealing defects due to the displacement of the sealing position of the lid do not occur. .

[0005]

A sealed container containing food according to the present invention comprises a polyester film having a thickness of 6 μ to 12 μ, and aluminum alloy foils having a thickness of 15 μ to 25 μ, which are adhered to the upper and lower surfaces of the polyester film. The side surface of the aluminum alloy foil is coated with a heat-sealing layer having a thickness of 1 μ to 10 μ, and the lid has a concave cross section on the horizontal wall continuous with the container body at the opening edge of the synthetic resin container. It is heat-sealed.

In the food-sealed container according to the present invention, the heat-sealing layer of the lid is thinned from 1 μ to 10 μ, so that the heat-sealed strength of the food-sealed container is not so large, so that the sealed container can be opened relatively easily. When a large sheet-shaped lid material is punched into a lid shape by a cutter, the load of the cutter blade is relatively small, so that the life of the cutter blade is extended. Furthermore, when the lid of the container is embossed, the heat seal layer of the lid is thinned, so that the difference in elongation due to the pressing force between the heat seal layer of the composite material and the aluminum foil during embossing is reduced, and curling is less likely to occur. For this reason, the lid is smoothly sucked, correctly inserted into the holder sent to the sterilization zone, and the lid is smoothly put on the container at a predetermined position by an automated machine, and thinned. The heat seal layer of the lid is prevented from further curling because the difference in elongation due to heating between the heat seal layer of the composite material and the aluminum alloy foil in the drying step after sterilization is reduced, and the lid is further sealed Sealing failure due to misalignment is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS.
A pudding 2 is put in a container 1 made of polystyrene (PS) resin, and a lid 3 described later is heat-sealed with a concave cross section on a substantially horizontal wall 1 ′ provided continuously to the container at the upper opening peripheral edge of the container 1. 4 is a sealed container 5 containing pudding in which the upper opening of the container 1 is sealed. The lid 3 is provided by adhering an aluminum alloy foil 7 having a thickness of about 20 μ to an upper surface of a polyester (PET) film 6 having a thickness of about 9 μ with an adhesive layer 8 of polyester resin.
An aluminum alloy foil 9 having a thickness of about 20 μ is adhered to the lower surface of the above with an adhesive layer 10 of polyester resin. The lower surface of the lower surface side aluminum alloy foil 9 is provided with a heat seal layer 11 coated with vinyl chloride vinyl acetate acrylic resin to a thickness of about 5 μm.

In the sealed container 5 containing pudding, the PET film 6 having a thickness of about 9 μ has been described as the lid 3, but as a result of an experiment, the thickness of the film is preferably about 6 μ to about 12 μ. Similarly, the thickness of the aluminum alloy foils 7 and 9 should be about 15μ to about 25μ both on the upper and lower sides, and the aluminum alloy foils should be about 0.75% to about 0.75% as a result of the experiment. Those containing 2.0% or manganese (Mn) from about 0.3% to about 1.
Those containing 5% are particularly preferable. And PET film 6
As aluminum alloy foils 7 and 9 provided on both upper and lower sides of 1
One may contain about 0.75% to about 2.0% iron (Fe), and the other may contain about 0.3% to about 1.5% manganese (Mn). Further heat seal layer 1
As a result of an experiment, the thickness of 1 may be about 1 μ to about 10 μ, and the heat seal layer 11 may be vinyl chloride vinyl acetate acrylic resin containing 50% or more of vinyl chloride vinyl acetate acrylic resin.

The results of experiments conducted on the sealed container 5 containing pudding are as follows. Note 1 * ○ is good. △ is a little good. X is bad. Note 2 * The comparative product uses pure aluminum foil instead of aluminum alloy foil in the lid of the present invention. From the results of this experiment, it can be seen that the product of the present invention is excellent in all respects. On the other hand, it can be seen that the conventional product is inferior to the product of the present invention in the punchability of the lid and the ease of opening the lid, and since the comparative product is pure aluminum foil, it is too weak and the punchability of the lid and the line of the lid. It can be seen that the foil tear at the time of sealing and the foil tear at the time of opening the lid are inferior to those of the present invention. In addition, although this pudding-sealed container has been described as a circular container and lid, the container and lid may have an appropriate shape such as a square such as a quadrangle or an ellipse, and the container is coated with a synthetic resin. It may be a paper container. When heat-sealing the lid of the container, a hollow flat heating mold is provided below, and an inverted convex heating mold is provided above the container.The opening edge wall of the container and the lid are cross-sectionally concave with both heating molds. It is good to heat seal to shape.

[0010]

EXAMPLE A jelly is put in a polypropylene (PP) synthetic resin container, and a lid 21 described later is heat-sealed in a concave cross-section on a substantially horizontal wall continuously provided on the peripheral edge of the upper opening of the container. It is a sealed container containing jelly in which the upper opening of the container is sealed. As shown in FIG. 4, the lid 21 is a polyester (PET) film 22 having a thickness of about 9 μ.
An aluminum alloy foil 23 having a thickness of about 20 μ is formed on the upper surface of
A polyester resin adhesive layer 24 is used for adhesion, and the polyester (PET) film 22 has a lower surface with a thickness of about 2
An aluminum alloy foil 25 of 0 μ is adhered and provided with an adhesive layer 26 of polyester resin. The lower surface of the lower surface side aluminum alloy foil 25 is provided with a heat seal layer 27 formed by coating polypropylene (PP) resin to a thickness of about 4 μm. A polypropylene resin containing 50% or more of polypropylene resin may be used as the heat seal layer.

[0011]

EXAMPLE As shown in FIG. 5 and FIG. 6, a polyethylene container made of polyethylene (PE) resin is coated on a paper, and polyethylene is formed on a substantially horizontal wall 31 'continuous with the container at the upper opening peripheral edge of the container. Fit the (PE) resin receiving ring 32,
It is provided as a heat seal 33. A beverage 34 is placed in the container 31 with the receiving ring 32, and a lid 35 described later is heat-sealed to have a concave cross section 36 to hermetically seal the upper opening of the container. The lid 35 is provided by adhering an aluminum alloy foil 39 having a thickness of about 15 μ with a polyester resin adhesive layer 40 on the upper surface of a polyester (PET) film 38 having a thickness of about 12 μ.
T) An aluminum alloy foil 41 having a thickness of about 15 μm is provided on the lower surface of the film 38 by a polyester resin adhesive layer 42. The lower surface of the lower surface side aluminum alloy foil 41 is provided with a heat seal layer 43 coated with ethylene vinyl acetate resin to a thickness of about 7 μm. It should be noted that ethylene vinyl acetate resin was used as the heat seal layer.
It is also possible to use an ethylene vinyl acetate-based resin containing 0% or more.

[0012]

The food-sealed container according to the present invention has a relatively small heat-sealing strength because the lid is heat-sealed to the container by providing the lid with a thin heat-sealing layer having a thickness of 1 μ to 10 μ. It has an effect that it is easy to open when opening. The thickness of the lid is 15μ to 25μ
Since a thin and slightly strong aluminum alloy foil is used, even if the heat-sealing part of the lid is bent or stretched to have a concave cross section, the aluminum alloy foil does not break like industrial pure aluminum foil and has a concave cross section. The heat-sealing portion is heat-sealed in both the vertical and horizontal directions, although the heat-sealing portion can be molded into a shape and the heat-sealing portion has a concave cross-section, so that the heat-sealing layer is as thin as 10 μm or less. Therefore, even if a force in a certain direction is inadvertently applied to the heat-sealing portion, it is possible to prevent the heat-sealing portion from being opened, and it is possible to maintain a somewhat high heat-sealing strength. Further, since the heat-sealing layer of the lid of the food-sealed container according to the present invention is thinned to 10 μm or less, the burden on the cutter blade when punching a sheet-like lid material is small, and therefore the life of the cutter blade can be extended. However, the difference in elongation due to the applied pressure between the heat seal layer and the aluminum alloy foil becomes smaller during embossing, and the difference in elongation due to heat between the heat seal layer and the aluminum alloy foil becomes smaller during drying after sterilizing the lid. Therefore, there is an effect that the lid is less likely to curl. In this way, the curl-resistant lid can be smoothly suctioned one by one when it is put on the container, and the smoothly sucked lids can be smoothly and surely put on one container at a predetermined position. It is possible to prevent the heat-sealing failure caused by the lid placed on the container being displaced from a predetermined position.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a product of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is likewise an enlarged sectional view of the lid.

FIG. 4 is an enlarged cross-sectional view of another lid of the present invention.

FIG. 5 is a partially enlarged sectional view of still another product of the present invention.

FIG. 6 is also an enlarged cross-sectional view of the lid.

[Explanation of symbols]

 1 Container 1'Wall 2 Pudding 3 Lid 4 Heat Seal 5 Sealing Container 6 Film 7 Aluminum Alloy Foil 8 Adhesive Layer 9 Aluminum Alloy Foil 10 Adhesive Layer 11 Heat Seal Layer 21 Lid 22 Film 23 Aluminum Alloy Foil 24 Adhesive Layer 25 Aluminum Alloy Foil 26 Adhesive Layer 27 Heat Seal Layer 31 Container 31 'Wall 32 Receiving Ring 33 Heat Seal 34 Beverage 35 Lid 36 Heat Seal 37 Sealed Container 38 Film 39 Aluminum Alloy Foil 40 Adhesive Layer 41 Aluminum Alloy Foil 42 Adhesive Layer 43 Heat Seal Layer

Claims (11)

[Claims] 1. An aluminum alloy foil having a thickness of 15 μ to 25 μ is adhered to both upper and lower surfaces of a polyester film having a thickness of 6 μ to 12 μ, and a thickness of 1 μ to 10 μ is provided on the lower surface of the lower surface side aluminum alloy foil. A lid provided with a heat-sealing layer coated on a substantially horizontal wall continuous with the container body at the opening edge of the synthetic resin container,
A sealed container containing food, which is heat-sealed to have a concave cross section. 2. A polyester film having a thickness of 6 μ to 12 μ, and aluminum alloy foils having a thickness of 15 μ to 25 μ are respectively adhered to the upper and lower surfaces of the polyester film, and the lower surface of the aluminum alloy foil has a thickness of 1 μ to 10 μ. It is characterized in that a lid provided with a coated heat-sealing layer is heat-sealed with a concave cross-section on a substantially horizontal wall continuous with the container body at the opening edge of a paper container coated with a synthetic resin. A sealed container containing food. 3. A polyester film having a thickness of 6 μ to 12 μ, and aluminum alloy foils having a thickness of 15 μ to 25 μ are respectively adhered and provided on both upper and lower surfaces, and the lower surface of the aluminum alloy foil has a thickness of 1 μ to 10 μ. The cover with the heat-sealing layer coated on the synthetic resin receiving ring provided on the edge of the opening of the paper container coated with the synthetic resin on the almost horizontal wall continuous with the container body A sealed container containing food, which is heat-sealed in a concave shape. 4. The sealed container containing food according to claim 1, wherein the aluminum alloy foil is an aluminum alloy foil containing 0.75% to 2.0% of iron. 5. The aluminum alloy foil contains 0.3% manganese.
% To 1.5% of aluminum alloy foil, The food-stuffed sealed container according to claim 1, 2, or 3. 6. One of the upper and lower aluminum alloy foils is an aluminum alloy foil containing 0.75% to 2.0% iron, and the other of the upper and lower aluminum alloy foils is 0.3% manganese. The sealed container containing food according to claim 3, which is an aluminum alloy foil containing 1.5%. 7. The hermetically-sealed container containing food according to claim 1, wherein the heat-sealing layer is a vinyl chloride vinyl acetate acrylic resin. 8. The food-sealed container according to claim 1, wherein the heat-sealing layer is a polypropylene resin. 9. The hermetically-sealed container containing food according to claim 1, wherein the heat-sealing layer is an ethylene vinyl acetate-based resin. 10. The sealed container containing food according to claim 1, wherein the synthetic resin container is a polystyrene container. 11. The hermetically-sealed container containing food according to claim 1, wherein the synthetic resin container is a polypropylene container.