JPH0314476A - Easy-to-open vessel for packaging food - Google Patents

Abstract

PURPOSE:To joint between a first layer comprising a plastic film of a vessel collar and a heat sealing material layer on the lower face of a lid by forming a wide circular first heat sealing material on the first layer of the collar and the heat sealing material layer of the lid. CONSTITUTION:A package has a vessel body 1 having a collar 3 in the periphery of the mouth and a heat sealing material layer 6 covering the body 1 and also in the lower face. It also comprises a lid 2 provided with a tab 14 for unpacking on one side of the outer periphery. The vessel body 1 comprises a laminated sheet wherein a first layer 4 made of a plastic film and a second layer 5 comprising a plastic film or a metal foil joint to the outer surface of said layer 4 in an easy-to-detach state are provided. In the periphery of the vessel mouth of the collar 3 or in the vicinity of the periphery, a circular cut 11 is provided approximately on a whole circumference of the collar on the first layer 4. A wide circular first heat sealing part A having grid-like joints is formed on the first layer 4 of the collar 3 and on the heat sealing material layer 6 of the lid 2 outward with respect to this cut 11, while a narrow circular second hot blast sealing part B is formed inside, thereby forming a third heat sealing part C on the side end of the collar of the tab 14 for unpacking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an easy-to-open container for food packaging.

Conventional technology Conventionally, two materials were made of aluminum foil and synthetic resin film.
In composite containers with more than one layer, the first layer made of synthetic resin film and the next layer made of aluminum foil or synthetic resin film have an adhesive strength that is easy to peel, and the flange part A cut is provided near the periphery of the opening of the container main body, and outside the cut, the first layer made of the resin film and the heat sealing material layer provided on the lower surface of the lid have a flat heating surface for sealing. The container was sealed by heat and pressure fusion using a flat seal using a heat sealing device. When opening the package, hold the knob on the lid and pull the lid off.
While the first layer made of resin film on the container flange and the heat sealing material layer on the lid are still bonded, the first layer made of resin film with weak adhesive strength and the next layer are peeled off, so it is easy to seal. Problems to be Solved by the Invention However, with such conventional food packaging containers,
When the content is liquid or viscous, such as alcohol, juice, or jam, contaminants such as water may be present between the first layer of resin film on the flange and the heat sealing material layer on the underside of the lid. If it exists, there is a problem in that the portion is not fused even when heated and pressurized, causing so-called blisters, and the sealing performance is significantly reduced. Furthermore, even if it were possible to seal the container in the presence of foreign substances such as water or jam, the adhesive force is weak, so if the internal pressure of the container increases due to heating during retort sterilization after sealing, this may occur. The joints with the weakest adhesive strength will peel off due to the high internal pressure.
There was a problem that the sealing performance was impaired.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to prevent contaminants such as water and jam from forming between the first layer of resin film on the flange of the container body and the heat sealing material layer on the bottom surface of the lid. Even if there are However, the lid can withstand this resistance sufficiently, the sealing performance is not impaired, and the lid can be opened reliably without requiring much force and can be easily peeled, making it easy to handle. The purpose of the present invention is to provide an easy-to-open container for food packaging that is easy and very convenient.

Means for Solving the Problems In order to achieve the above object, the present invention first provides a container body having a flange on the periphery of the opening, and a container body and the flange covered with a heating element on the lower surface. The lid has a sealing material layer and is provided with an opening knob on the negative side of the outer periphery, so that the container body is easily separated from the first layer made of synthetic resin film and the outer surface thereof. It is made of a laminated sheet with a second layer made of a bonded synthetic resin film or metal foil, and the first layer is formed at the periphery of the opening of the container main body at the flange or at a portion near the periphery.
An annular cut is provided in the layer over almost the entire circumference of the flange, and outside the cut, a wide annular first layer having a checkered joint is formed between the first layer of the flange and the heat sealing material layer of the lid. A heat-sealed portion is formed, a narrow annular second heat-sealed portion is formed inside the annular first heat-sealed portion, and a third heat-sealed portion is formed at the flange side end of the opening knob. This article focuses on easy-to-open containers for food packaging.

Next, a second aspect of the present invention is that a bent edge is provided at the tip of the flange of the above-mentioned easy-to-open container for food packaging, and the bent edge is connected to the periphery of the opening of the container main body of the flange or a portion near the periphery. First and second cuts are provided in the first layer at the edge portions, respectively, over approximately the entire circumference of the flange, and a checkered pattern is formed in the first layer of the flange and the heat sealing material layer of the lid between these cuts. A wide annular first heat-sealing part is formed having a joint part, and a narrow annular second heat-sealing part is formed inside the annular first heat-sealing part, and a flange of the opening knob is formed. The gist of the present invention is an easy-to-open container for food packaging in which a third heat-sealing portion is formed at the side end.

In the above, the laminated sheet constituting the container body includes a first layer made of a synthetic resin film and a second layer made of a synthetic resin film or metal foil bonded to the outer surface of the first layer so as to be easily separated.

Such a laminated sheet is usually a metal foil, especially an aluminum foil, with one or two synthetic resin layers provided on one side of the foil.

Of course, as the laminated sheet, a synthetic resin laminated sheet made of two or more layers of synthetic resin films without metal foil can also be used.

Here, the synthetic resin layer provided on one side of the aluminum foil is made of, for example, polyolefin such as polypropylene or polyethylene, or polyester, polyvinyl chloride, polycarbonate, polystyrene, a copolymer thereof,
Alternatively, it may be made of a synthetic resin obtained by blending these resins in the required proportions.

These synthetic resin layers may be composed of one layer of synthetic resin film, or may be composed of two or more mutually different layers of synthetic resin films.

The total thickness of the synthetic resin layer is 100 to 500 m.
, preferably 200 to 4001 m. In addition, it is preferable that the synthetic resin layer be thicker than the aluminum foil to prevent local wrinkles from forming on the flange of the container during drawing.

Here, the thickness of the aluminum foil is, for example, 40 to 200 mm.
It is Jm.

When the synthetic resin layer is composed of two layers of synthetic resin films, for example, (1) an unstretched synthetic resin coextruded film and (■) two types of thermoplastic synthetic resin films are used as an easily peelable adhesive layer. A laminated film is used, which is bonded via a laminate film.

Here, (I) the unstretched synthetic resin coextruded film includes, for example, polypropylene, polyethylene, polyester, polyvinyl chloride, and polycarbonate, and includes, for example, a coextruded film consisting of two layers of polypropylene and high-density polyethylene. use Of course, the coextruded film may be a combination of other resins, and two or more layers may be used.

In addition, in the above (■) laminated film in which two types of thermoplastic synthetic resin films are bonded via an easily peelable adhesive layer, the first layer on the front side of the laminated film and the second layer on the back side of the laminated film are formed. Examples of the thermoplastic synthetic resin film include polypropylene, polyethylene, nylon, polyvinyl chloride, polycarbonate, etc., and a synthetic resin film made of, for example, a combination of polypropylene and high-density polyethylene is used. Of course, the thermoplastic synthetic resin film may be a combination of other resins.

Also, the laminated sheet can be made of metal foil, especially aluminum foil,
In the case of a single layer of synthetic resin film bonded to one side of the film through an easily peelable adhesive layer, the synthetic resin film constitutes the first layer, and the metal foil constitutes the second layer. Configure.

In the laminated film described in (n) above, in which two types of thermoplastic synthetic resin films are bonded via an easily peelable adhesive layer, or alternatively, the first layer made of a resin film is attached to one side of an aluminum foil with easily peelable adhesive. In the laminated sheets joined through the adhesive layer, as the easily peelable adhesive, for example, a polyether adhesive having easily peelable properties is used.

In addition, such an easily peelable adhesive layer includes an adhesive layer made of a monoolefin-unsaturated carboxylic acid copolymer resin or its metal salt, and a coating layer having easy peelability such as a silicone resin paint. A combination of these may also be used.

In any of the above cases, the adhesive strength that allows easy beer between the first layer on the front side and the second layer on the back side is 50
0-1500g/15 questions width, preferably 700-9
00g/15mm width.

In the first aspect of the invention, the first layer of the synthetic resin film of the flange and the heat sealing material layer of the lid have a relatively low weight, for example, 50 kg, on the outside of the cut in the flange.
They were joined with a relatively weak adhesive force by a sealing pressure of less than 1 f/c and by a so-called low-resoto seal using a primary heat sealing device in which the sealing heating surface of the seal head was shaped like a checkered pattern (knurling). A wide annular first heat-sealed portion having a checkered joint is formed.

By applying such knurl sealing, the first layer of resin film on the flange and the heat sealing material layer on the bottom surface of the lid are fused together under heat and pressure so that a checkered joint is formed. However, at this time, the first part made of the resin film of the flange
If contaminants such as water or jam exist between the layer and the heat sealant layer, these contaminants will enter the mesh-like voids between the checkered joints, so make sure to seal the container thoroughly. It is something that can be done.

Next, a wide annular first part having a checkered joint is formed.
Inside the heat-sealed part, a relatively medium amount of, for example, 50 to 1
By heating and pressurizing fusion using a sealing pressure of 0.0 kgf'/cd, a narrow annular second heat-sealed portion joined with a relatively medium adhesive force is formed.

In this way, by forming the narrow annular second heat-sealing part joined by a medium adhesive force stronger than the adhesive force of the first heat-sealing part, it is possible to seal the sealed container by heating during retort sterilization, for example. Even if the internal pressure becomes high, it can sufficiently withstand this and the sealing performance will not be impaired.

Further, at the flange side end of the opening knob, which is approximately triangular when viewed from a plane provided on one side of the outer peripheral edge of the lid, the first layer of the resin film of the flange and the heat sealing material layer of the lid are bonded to each other. , for example, exceeding 100 kgf/c- and 1
By heating and pressurizing fusion using a sealing pressure of up to 50 kgf'/cd, a substantially arc-shaped third heat-sealed portion joined by a relatively strong adhesive force is formed.

A substantially arc-shaped third bonded by such strong adhesive force
By forming the heat-sealing portion, the first layer of the resin film of the flange portion and the heat-sealing material layer of the lid are strongly bonded in this portion, and the lid can be opened reliably.

Also, at this time, the first layer made of resin film on the flange side and the second layer made of synthetic resin film or metal foil bonded to the outer surface of this layer in a state where they can be easily separated are peeled off, so a large amount of force is applied when opening the bag. Easy peeling is possible without the need for

Note that while the narrow annular second heat-sealed portion is bonded with a relatively medium adhesive force, the approximately arc-shaped third heat-sealed portion is bonded with a relatively strong adhesive force. What is being said is that if the adhesive strength of the second heat-sealed part is too high,
Due to the heat and pressure fusion, not only the first layer of the flange but also the second layer below it is affected and thermally deformed, and the lid is bonded to the first and second layers of the flange as described above. This is because, when the package is opened by peeling it off between the seals, the thermally deformed portion of the second heat-sealed portion acts as a peel resistance and requires a large force, making it difficult to open the package, which is undesirable.

Here, the method of forming the third heat-sealing part on the edge of the flange side of the opening knob is as follows: (1) Using a circular lid that is not provided with an opening knob from the beginning, after heat-sealing. There is a difference between the case where the opening knob is formed by punching and the case where (11) a lid is used in which a substantially triangular opening knob is originally provided on one side of the outer peripheral edge.

First, when using a circular lid that is not provided with an opening knob (1) from the beginning, the circular lid has an outer diameter larger than the outer diameter of the flange.

This circular lid is placed over the flange of the container body, and a wide annular first heat-sealed portion having the checkered joint is formed on the outside of the cut in the flange.
The narrow annular second heat sealing part is formed inside the heat sealing part, and a third heat sealing part is annularly formed along the outer peripheral edge of the annular first heat sealing part. Finally, the lid and the flange are punched out along the inner peripheral edge of the annular third heat-sealed portion so that a portion of the approximately triangular opening knob remains on one side of the lid.

Next, when using a lid that is originally provided with a substantially triangular opening knob on one side of the outer periphery of (I1), place the lid with the knob over the flange of the container body. , a wide annular first heat-sealed part having the above-mentioned checkered joint is formed outside the cut of the flange, and then a narrow annular second heat-sealed part is formed inside this annular ML heat-sealed part. At the same time, a third heat sealing part is formed in a substantially arc shape at the end of the opening knob on the flange side.

In addition, in the cases of ゛(l>) and (l1) above, the third heat-sealing part can be formed together with the second heat-sealing part when forming the second heat-sealing part using a secondary heat-sealing device.

That is, in the case of method (1) above, a low-height annular downward sealing protrusion is formed on the inner peripheral edge of the seal head of the secondary heat sealing device, whereas the outer peripheral edge of the seal head is An annular downward sealing convex portion having a higher height is provided in each portion. Here, the difference in height (ρ) between the inner and outer sealing convex portions is approximately 0.1 to 0.5 degrees.

On the other hand, in the case of Ht) above, the shape of the high downward sealing protrusion on the outer periphery of the seal head is made to match the shape of the flange side end of the opening knob. It is approximately arc-shaped.

Then, using a secondary heat sealing device equipped with a seal head having such two sealing protrusions, the first layer of the flange and the heat sealant layer of the lid are sealed inside the first heat sealant layer. By pressurizing and heating them again, a narrow annular second heat-sealing part is formed at a location corresponding to the inner low-height annular sealing convex part, and at the same time, the outer high-height sealing part is formed. A third heat-sealed portion is formed at a location corresponding to the convex portion, which is bonded with a stronger sealing pressure and a relatively stronger adhesive force.

Note that the first, second, and third heat sealing parts are sequentially sealed using primary, secondary, and tertiary heat sealing devices equipped with separate sealing heads each having a corresponding sealing convex part. Of course, it is also possible to form it.

On the other hand, in the case of the second invention, a bent edge (a rolled edge or a hanging bent edge) is provided at the tip of the flange in order to ensure safety during use, give a sense of luxury to the container, and increase strength. is provided. Then, at the periphery of the opening of the container main body of the flange, or the portion near the periphery and the bent edge portion, a measure is taken between the first cut and the second cut, which are provided almost all around the first layer, to prevent contaminants such as water. As,
A wide annular first heat-sealed part is formed that is joined with a relatively weak adhesive force and has a checkered joint, and the inside of this annular first heat-sealed part is sealed by heating during retort sterilization. In order to withstand an increase in the internal pressure of the container, a narrow annular second heat sealing part is formed that is joined with a relatively medium adhesive force, and an opening knob part is formed to ensure the ease of opening the lid. A short, substantially arc-shaped third heat-sealed portion is formed on the side end of the flange portion of the heat-sealed portion with a relatively strong adhesive force.

In addition, in the case of a packaging container having this bent edge, the third
The heat-sealed portion is shaped by the method (1l) above.

In the first and second inventions above, a protective coating layer is usually provided on the outer surface of the aluminum foil of the container body via an adhesive layer, and if necessary, a protective coating layer is provided between the aluminum foil and the protective coating layer. A printed layer is provided.

Here, the printing layer is applied using, for example, polyvinyl chloride-vinyl acetate-based, nitrocellulose-based, and urethane-based inks.

In addition, the protective coating layer is to protect the aluminum foil, and this is achieved by coating the aluminum foil with a synthetic resin that has excellent chemical resistance and weather resistance.
Alternatively, it is formed by joining layers of the same synthetic resin. The thickness of the protective coating layer made of these resins is 1 to 507 mm.
It is preferable to set it to m. The thickness of the protective coating layer is, of course, 5 (
It may be even larger than lm.

Example Next, embodiments of the present invention will be described based on the drawings.

Example 1 First, in FIGS. 1 to 6 showing a first example of the first invention, an easy-to-open container for food packaging according to the invention has a container body (1) having a flange (3) at the opening periphery. ), and a heat sealing material layer (
6).

Here, the container body (1) is made by co-extruding a laminated sheet consisting of a 100 mm thick fake aluminum foil (7) and a 300 mm thick unstretched synthetic resin coextruded film bonded to one side of the aluminum foil (7). It is formed by drawing with the film inside.

The above-mentioned unstretched synthetic resin coextruded film has a first layer on the surface side (4
) and a second layer (5) with a thickness of 230 mm made of polypropylene on the aluminum foil (7) side, and both layers (4
) and (5) are adhered to each other in a peelable manner with an adhesive strength of approximately 800 g/151 width.

Further, in this embodiment, a printing layer (not shown) is provided on the outer surface of the aluminum foil (7) via an adhesive layer, and a protective coating layer (8 > is provided.

Then, a cut (l1) is formed in the first layer (4) on the surface side of the unstretched coextruded film at a portion of the flange (3) near the periphery of the opening of the container body so that the cut (l1) goes around the entire circumference of the flange (3). It is provided.

Note that the cuts (11) can be made, for example, by partially cutting off the first layer (4) with a knife, or by cutting off the first layer (4) partially.
It may be formed by partially heating and removing.

Contents (not shown) such as desserts and cooked foods are stored in the container main body (1), and a lid (2) having a heat sealing material layer (6) on the lower surface is placed on the container body (1).

In this embodiment, as shown in FIG.
14) was not provided on the lid (2) from the beginning, and the flange (
3) is used. A circular lid (2) having an outer diameter (as shown in the dashed line in the figure) larger than the outer diameter (as shown in the dashed line in the figure) is used.

As shown in FIGS. 2 and 3, first, heat is applied to the portion outside the cut (11) of the first layer (4) of the container body flange (3) and the corresponding lid (2) side. The sealing layer (6) portion is a primary heat sealing device i (2
1), the first heat-sealed part (A) is formed into a wide annular shape having checkered joints joined with a relatively weak adhesive force by heat-pressure welding at a sealing pressure of about 40 kgf'/cd. Ru.

By applying such a knurling seal, as shown in detail in FIG.
) and the heat sealing material layer (6), contaminants such as water and jam may be trapped in the mesh-like voids between the checkered joints (
10>, it is possible to join both layers (4) and (6), thereby making it possible to sufficiently seal the container.

Next, as shown in FIG. 4, a secondary heat sealing device (22) is used.
The corresponding part inside the first heat sealing part (A) is reheated at a sealing pressure of about 80 kgf'/cd by the low-height annular sealing convex part (23) on the inner peripheral edge of the seal head. A narrow annular second heat-sealed part (B) is formed by pressure fusion and bonding with a relatively medium adhesive force that is stronger than that of the first heat-sealed part (A). As a result, even if the internal pressure of the sealed container increases due to heating during retort sterilization, for example, it can withstand this sufficiently.
Sealing performance is not impaired.

Furthermore, at the same time, the seal of the same sealing device (22)
An annular seal convex portion (23) located on the outer periphery of the head
The first heat sealing part (
At the outer peripheral edge of A), the corresponding portions of the first layer (4) of the flange and the heat sealing material layer (8) are heated and pressure-fused again at a high sealing pressure of approximately 120 kgf/c-. The annular third heat-sealed part (C
) is formed.

Thereafter, the M (2) and the flange (3) are attached along the inner periphery of the annular third heat-sealed part (C), and a substantially triangular opening knob (14) is attached to one side of the lid (2). ) by punching out so as to leave a part of it (in Figure 5, the one-dot chain line part and the two-dot chain line part are punched out), Figure 1 and Figures 4 to 4 are punched out.
As shown in Figure 6, three heat-sealed parts (A) (B)
A food packaging sealed container having (C) is obtained.

When opening the food packaging sealed container with the three heat-sealed parts (A), (B), and (C) formed in this way, hold the opening knob (14) of M(2) and pull it upward. and,
At the end of the opening knob (14) on the flange side, the third heat sealing material layer (C) seals the first layer (4) of the flange (3) and the lid (2).
Since the heat sealing material layer (8) is firmly bonded, both layers (4) and (8) remain in close contact with each other, and the two unstretched coextruded films on the flange (3) side The film layers (4) and (5) are peeled off, thereby making it possible to reliably open the lid. Moreover, since both layers (4) and (5) are adhered with a removable adhesive strength of approximately 800 g/15 am width, no great force is required to open the bag, allowing for easy beer.

Embodiment 2 FIG. 7 shows another embodiment of the first invention. Here, the difference from the first embodiment is that the container body (1) has only one resin layer. That is, in this second embodiment, the container body (1) has a thickness of 300 uI.
It is made of a laminated sheet consisting of a first layer (4) on the front side made of a polypropylene resin film of I1 and a second layer (5) on the back side made of aluminum foil with a thickness of 100 μII, and both layers ( As the adhesive layer for releasably bonding 4) and 5) to each other, a polyether adhesive having easy peelability is used. In this case, the peel strength of both layers (4) and (5) is 800 g/15 am width.

Embodiment 3 FIG. 8 shows an embodiment of the second invention. In this third embodiment, the structure of the resin layer of the container body (1) is the same as in the first embodiment, but it is designed to ensure safety during use, give a luxurious feel to the container, and increase strength. A bent edge (rolled edge) (13) is provided at the tip of the flange (3), and a flange is provided at a portion of the flange (3) closer to the container body opening periphery and a portion closer to the bent edge (l3). (3
), the first cut (11
) and a second cut (l2) are provided, which is different from the first embodiment.

In addition, in the third embodiment, an opening knob (
14> is used from the beginning, and a sealing protrusion (24) provided on one side of the outer periphery of the seal head of the secondary heat sealing device (22) shown in FIG. 〉 is approximately arc-shaped.

Embodiment 4 FIG. 9 shows another embodiment of the second invention. In this fourth embodiment, a bent edge (hanging bent edge) (15) is provided at the tip of the flange (3) in order to ensure safety during use, give a sense of luxury to the container, and increase strength. The resin layer of the container body (1) is one layer as in the case of the second embodiment.

The other points of the second to fourth embodiments are the same as those of the first embodiment, so the same parts are given the same reference numerals in the drawings.

In each of the above examples, the cross-sectional shape of the cuts (11) and (12) provided in the first layer (4) of the resin film of the container body flange (3) is not limited to that shown in the drawings. Optional.

In addition, in the case shown, a cut (1l) is provided in the first layer (4) at a portion of the flange (3) near the periphery of the opening of the container body; ) may be provided in the first layer (4) at the periphery of the opening of the container body.

Effects of the Invention First of all, the easy-to-open container for food packaging according to the first aspect of the invention, as described above, includes a container body having a flange on the periphery of the opening, a flange covering the container body and the flange, and a flange on the periphery of the opening. The container body is made up of a lid that covers the container body and the flange, has a heat sealing material layer on the lower surface, and is provided with an opening knob on one side of the outer periphery. It is made of a laminated sheet comprising a first layer made of a resin film and a second layer made of a synthetic resin film or metal foil that is easily separated from the outer surface of the first layer, and the rim of the opening of the container body at the flange. Alternatively, an annular cut is provided in the first layer in a portion near the periphery around the entire circumference of the flange, and a checkered pattern is formed on the first layer of the flange and the heat sealing material layer of the lid outside of the cut. Since the first heat-sealing needle part has a wide annular shape with a joint, there is a gap between the first layer of resin film on the flange of the container body and the heat-sealing material layer on the bottom surface of the lid, even if water or Even if foreign substances such as jam are present, these foreign substances will enter the mesh-like voids between the checkered joints, allowing both layers to be joined and the container to be sufficiently sealed. It is something that can be done.

Also, inside this annular first heat sealing part, there is a narrow annular second heat sealing part.
Because the heat-sealed part is formed, even if the internal pressure of the sealed container increases due to heating during retort sterilization, it can withstand this sufficiently and the sealing performance will not be compromised. do not have.

Further, since the third heat-sealing part is formed at the end of the opening knob on the flange side, when the opening knob of the lid is lifted, the third heat-sealing material is formed at the end of the opening knob on the flange side. Since the first layer of the flange and the heat sealing material layer of the lid are firmly bonded by the layer, these two layers remain in close contact with each other, and the adhesive strength on the flange side allows for easy peeling. Easier than between two layers! 11, thereby allowing the lid to be opened reliably. Moreover, the two layers on the brim side are tightly bonded with adhesive strength that allows them to be easily peeled off, so no great force is required to open the bag, making it possible to make an easy beer, making the container easy to handle. This has the effect of being extremely convenient.

Moreover, since the easy-open container for food packaging according to the second invention of Yomei is provided with a bent edge at the tip of the flange, it is possible to give the container a luxurious feel and increase its strength, A wide annular first heat sealing member having a checkered striped joint between the first layer of the collar member and the heat sealing material layer of the lid in the middle of the first and second cuts provided in the first layer of the collar member. Since the part is formed, as in the case of the first invention,
Even if there are foreign substances such as water or jam, the container can be sufficiently sealed, and a narrow annular second heat-sealed part is formed inside the annular first heat-sealed part. Because of this, even if the internal pressure of the sealed container increases due to heating during retort sterilization, it can withstand this sufficiently, the sealing performance is not impaired, and the flange side of the opening knob Since the third heat-sealing part is formed at the end, the lid can be opened reliably, and it does not require much force when opening, allowing easy peeling, making it easy to handle. This has the effect of being extremely convenient.

[Brief explanation of the drawing]

The drawings show various embodiments of the present invention, and FIG. 1 is an enlarged sectional view of the essential parts of the first embodiment of the invention, and FIG. 2 is an enlarged sectional view of the essential parts, in which the first heat sealing layer is It shows a deformed state. FIG. 3 is an enlarged sectional view of the main part of FIG. 2, and FIG. 4 is an enlarged sectional view of the main part, showing a state in which the second and third heat sealing layers have been formed. FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a schematic perspective view of the product of the present invention, FIG. 7 is an enlarged sectional view of essential parts of the product of the present invention of the second embodiment, and FIG. 8 9 is an enlarged sectional view of a main part of a product of the present invention according to a third embodiment, and FIG. 9 is an enlarged sectional view of a main part of a product of the present invention according to a fourth embodiment. (1)... Container body, (2)... Lid, (3)...
Tsuba, <4)...first layer, (5)...second layer, (6
)...Heat sealing material layer, (10)...Void portion, (11)
(12)... cut, (l3)... bent edge (rolled edge), (14)... opening knob, (15)... bent edge (hanging bent edge), (21 )(22)...Primary and secondary heat sealing device, (23)...Annular sealing protrusion, (24)...Sealing protrusion, (A)...First heat sealing part , (B)...Second heat sealing part, (C)...Third
Heat sealed part. that's all

Claims (2)

[Claims] (1) Container body (1) having a flange (3) at the opening periphery
and a lid that covers the container body (1) and the flange (3), has a heat sealing material layer (6) on the lower surface, and has an opening knob (14) connected to one side of the outer periphery. (2)
Thus, the container body (1) includes a first layer (4) made of a synthetic resin film and a second layer (5) made of a synthetic resin film or metal foil bonded to the outer surface of the first layer (4) in such a manner that it can be easily separated. It is made from laminated sheets,
An annular cut (11) is provided in the first layer (4) at the periphery of the opening of the container main body of the flange (3) or a portion near the periphery, and the annular cut (11) is provided around the entire circumference of the flange (3). ) A wide annular first heat sealing part (A) having a checkered joint between the first layer (4) of the flange part (3) and the heat sealing material layer (6) of the lid (2) on the outside of the flange part (3). A narrow annular second heat sealing part (B) is formed inside the annular first heat sealing part (A), and a second heat sealing part (B) is formed at the end of the opening knob (14) on the flange side. 3. An easy-to-open container for food packaging, in which a heat-sealing portion (C) is formed. (2) Container body (1) having a flange (3) at the opening periphery
and a lid that covers the container body (1) and the flange (3), has a heat sealing material layer (6) on the lower surface, and has an opening knob (14) connected to one side of the outer periphery. (2)
Thus, the container body (1) includes a first layer (4) made of a synthetic resin film and a second layer (5) made of a synthetic resin film or metal foil bonded to the outer surface of the first layer (4) in such a manner that it can be easily separated. It is made from laminated sheets,
A bent edge (13) is provided at the tip of the flange (3) of the container body (1).
(15) are provided, and first and second cuts are made in the first layer (4) at the periphery of the opening of the container body of the flange (3) or a portion near the periphery and a portion near the bent edges (13) and (15). (11) and (12) are provided over almost the entire circumference of the flange (3), and the first layer (4) of the flange (3) and the lid (2) A wide annular first heat sealing part (A) having a checkered joint is formed on the heat sealing material layer (8), and a narrow first heat sealing part (A) is formed inside the annular first heat sealing part (A). An easy-to-open container for food packaging, in which an annular second heat-sealing part (B) is formed, and a third heat-sealing part (C) is formed at the flange side end of the opening knob (14).