JP6998165B2 - Package - Google Patents

Description

The present invention relates to a package in which a lid is sealed on a flange of a container filled with contents such as food, film, medicine, cosmetics, and wet tissue. More specifically, the contents are sealed when unopened. With respect to a resealable package that can be packaged and the lid can be resealed after opening.

For example, as a resealable package containing foods such as butter, jam, miso, and boiled in soy sauce, as described in Patent Documents 1 and 2 below, the aluminum foil layer and its heat-sealing property laminated on one side thereof. Formed from a container formed by molding a composite sheet having a resin film layer and having a flange on the peripheral edge of the opening, and a composite sheet having an aluminum foil layer and a heat-sealing resin film layer laminated on one side thereof. It is made of an inner lid (sealing material) that is removable and heat-sealed to the flange of the container filled with the contents, and is made of a synthetic resin molded product and is detachably fitted to the flange of the container so as to cover the inner lid. Those with an outer lid (overcap) that is covered are known. According to the above-mentioned container, excellent barrier property and sealing property are obtained by the barrier layer and the sealing portion of the container and the inner lid before opening the inner lid, and after the inner lid is peeled off and opened, the container is used. The outer lid can be fitted on the flange and resealed.

Further, as another resealable package, as described in Patent Document 3 below, a cover tape (closure) having a sealant layer on the lower surface of the flange of the carrier tape (container) in which electronic parts are housed in a pocket. It is known that the sealant layer of the cover tape can be resealed even after being peeled off from the flange of the carrier tape due to its own cohesive failure.

Japanese Unexamined Patent Publication No. 10-152157 Japanese Unexamined Patent Publication No. 2014-12204 Japanese Unexamined Patent Publication No. 2015-166253

However, in the case of the package described in Patent Documents 1 and 2, after the inner lid is peeled off and removed and opened, the outer lid made of synthetic resin is fitted on the flange of the container and resealed, so that the package is sealed after resealing. The sex was not enough.
Further, in the package described in Patent Document 3, since the opening strength of the sealing portion is uniform, the entire cover tape is easily peeled off at once at the time of opening. Therefore, once all of the cover tape is peeled off, the cover tape is in the original accurate position. It was difficult to reseal, and if the position was misaligned, there was a risk that sufficient sealing performance could not be obtained.

The present invention has been made in view of the above problems, and it is possible to easily and surely reseal the lid to the flange of the container, and resealability is obtained even after resealing. The purpose is to provide a possible packaging.

The present invention comprises the following aspects in order to achieve the above object.

1) A container having a flange on the peripheral edge of the opening and a lid that is heat-sealed to the flange so as to close the opening of the container filled with the contents are provided, and the upper surface of the container flange is provided. Is composed of a heat-sealing resin layer, and the lower surface of the lid is composed of a heat-sealing resin layer of the flange of the container and a heat-sealing resin layer capable of heat-sealing. A resealing adhesive layer laminated on the back surface side of the fusing resin layer is provided, and the heat-sealing portion between the flange and the lid of the container is a part of the circumferential direction or a plurality of spaces spaced in the circumferential direction. A resealable package with a difficult-to-open part in the part that has a higher opening strength than the other parts.

2) The resealable package of 1) above, which is designed to be peeled off at the interface between the heat-sealing resin layer of the lid and the adhesive layer for resealing at the time of opening.

3) The lid is further provided with a heat-sealing resin layer for forming a difficult-to-open portion, which is laminated on the opposite side of the heat-sealing resin layer with the adhesive layer for resealing sandwiched therein. Resealable 1) or 2) above, which is formed by partially heat-sealing the heat-sealing resin layer for forming a difficult-to-open portion and the heat-sealing resin layer of the flange of the container. Package.

4) The resealable package of 3) above, wherein the heat-sealing resin layer for forming the difficult-to-open portion of the lid and the heat-sealing resin layer of the flange of the container are made of the same resin material.

5) A container having a flange on the peripheral edge of the opening and a lid that is heat-sealed to the flange so as to close the opening of the container filled with the contents are provided, and the upper surface of the container flange is provided. Is composed of a heat-sealing resin layer, and the lower surface of the lid is composed of a heat-sealing resin layer of the container flange and a heat-sealing resin layer, so that the container flange is formed. A resealing adhesive layer laminated on the back surface side of the heat-sealing resin layer is provided, and the heat-sealing portion between the flange and the lid of the container has a part in the circumferential direction or a space in the circumferential direction. A resealable package in which a difficult-to-open part having a higher opening strength than the other parts is provided in a plurality of parts.

6) The resealable package of 5) above, which is designed to be peeled off at the interface between the heat-sealing resin layer of the flange of the container and the adhesive layer for resealing at the time of opening.

7) The flange of the container is further provided with a heat-sealing resin layer for forming a difficult-to-open portion, which is laminated on the opposite side of the heat-sealing resin layer with the adhesive layer for resealing sandwiched therein. Resealing of 5) or 6) above, which is formed by partially heat-sealing the heat-sealing resin layer for forming the difficult-to-open portion of the container flange and the heat-sealing resin layer of the lid. Possible packaging.

8) The resealable package of 7) above, wherein the heat-sealing resin layer for forming a difficult-to-open portion of the flange of the container and the heat-sealing resin layer of the lid are made of the same resin material.

9) All the difficult-to-open parts are provided unevenly on one of the two halves that divide the heat-sealed part between the flange of the container and the lid into almost two equal parts in the circumferential direction, and all the parts on the lid. A resealable package according to any one of 1) to 8) above, in which an opening tab is provided at the edge farthest from the difficult-to-open portion.

10) One of the above 1) to 9), in which the difficult-to-open portion is provided in dots at two locations at the heat-sealed portion between the flange and the lid of the container, which are spaced apart from each other in the circumferential direction. Resealable packaging with one description.

11) Two difficult-to-open parts are provided in dots at a position that divides the heat-sealed part between the flange and the lid of the container into two equal parts in the circumferential direction, and approximately 2 by a straight line connecting the two difficult-to-open parts. The resealable package of 10) above, wherein an opening tab is provided at the edge of each of the two halves of the equally divided lid, farthest from the two difficult-to-open portions.

12) A resealable package according to any one of 1) to 11) above, wherein each of the container and the lid further comprises a metal leaf layer.

In the package of 1) or 5) above, when unopened, the lid is heat-sealed to the flange of the container, so that high sealing performance can be obtained. At the time of opening, the lid is peeled off from the flange of the container, but since the heat-sealed portion between the flange and the lid is partially provided with a difficult-to-open portion having increased opening strength, a part of the lid is partially provided. It is easy to remain without peeling from the flange. That is, by the opening operation, the lid is not completely peeled off and detached from the flange, but a part of the lid remains on the flange, and the contents are taken out in the partially opened state. Further, as the lid is peeled off at the time of opening, the resealing adhesive portion provided on one of the lid and the flange of the container is exposed. Then, when the partially opened lid is overlapped on the flange again, the resealing adhesive portion is attached to the other portion overlapping with the lid, whereby the lid is resealed. After the contents are used up, for example, by pulling the lid with a strong force, the lid is peeled off from the flange of the container even in the difficult-to-open portion, so that the container and the lid can be separated and disposed of.
As described above, according to the resealable package of 1) or 5) above, the lid can be easily and surely resealed to the flange of the container, and the sealing property is excellent even after resealing. Is obtained.

According to the package of 2) or 6) above, when the package is opened, it is peeled off at the interface between the heat-sealing resin layer of the flange of the lid or the container and the adhesive layer for resealing laminated on the back surface side thereof. The lid can be easily peeled off, and the peeling strength can be easily designed.

According to the package of 3) or 7) above, the difficult-to-open portion is a heat-sealing resin layer for forming the difficult-to-open portion provided on either one of the lid and the flange of the container, and the other heat-fusing. Since it is formed by partially heat-sealing the adhesive resin layer, the process of forming the difficult-to-open portion can be performed, for example, in the production line of the package, thereby improving the production efficiency. Costs can also be reduced.

According to the package of 4) or 8) above, the heat-sealing resin layer for forming a difficult-to-open portion provided on either one of the lid and the flange of the container, and the heat-sealing resin layer of the other. However, since they are made of the same resin material, the sealing strength of both is high, and therefore the opening strength of the difficult-to-open portion is high, so that the partial opening operation of the lid can be performed more reliably.

According to the package of 9) above, all the difficult-to-open parts are provided unevenly in one of the two half parts in which the heat-sealed part between the flange and the lid of the container is divided into approximately two equal parts in the circumferential direction. Therefore, the degree of opening of the lid can be relatively large, and the contents such as solid matter can be easily taken out. Further, according to the package of 9) above, since the opening tab is provided at the edge of the lid farthest from all the difficult-to-open parts, the opening direction of the lid can be easily grasped, and the opening direction of the lid can be easily grasped. , It becomes difficult for the external force applied at the time of opening the lid to concentrate on one difficult-to-open portion, and it is possible to prevent the difficult-to-open portion from being inadvertently peeled and opened.

According to the package of 10) above, the difficult-to-open portion is a two-point-shaped portion provided at the heat-sealed portion between the flange and the lid of the container at a circumferential interval, so that the difficult-to-open portion is formed. The degree of opening of the lid can be easily adjusted by appropriately changing the positions of the two difficult-to-open portions.

According to the package of 11) above, the lid can be opened almost half by half. Therefore, for example, when one half is opened and resealing is repeated, the adhesive strength of the adhesive layer for resealing is reduced. Therefore, it is possible to open the other half instead of one half and reseal it, and since it can be used as a resealable lid for a longer period of time, the sealing property as a package is maintained. be able to.

According to the package of 12) above, since the metal foil layer is provided on each of the container and the lid, excellent barrier properties can be obtained not only when unopened but also when resealed, and the contents are deteriorated. It can be effectively suppressed and stored for a long period of time.

It shows the package which concerns on 1st Embodiment of this invention, (a) is a plan view, (b) is a front view. It is a partially enlarged vertical sectional view of the package along the line II-II of FIG. 1, (a) is a figure which shows the state at the time of unopening, and (b) is a figure which shows the state after opening. It is a partially enlarged vertical sectional view of the package body along the line III-III of FIG. It is a top view which shows the package which concerns on 2nd Embodiment of this invention. It is a top view which shows the package which concerns on 3rd Embodiment of this invention. A package according to a fourth embodiment of the present invention is shown, in which (a) is a plan view and (b) is a front view. It shows the 5th Embodiment of this invention and corresponds to FIG. It shows the 5th Embodiment of this invention and is the figure corresponding to FIG. It is a top view which shows the package of an Example.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8.

<First Embodiment>
1 to 3 show the package of the first embodiment according to the present invention.
The illustrated package (11) is formed by sealing and packaging the contents (C) of foods such as butter, jam, and miso using a container (2) and a lid (3).
The container (2) is a cup shape formed by deep drawing the composite sheet (20). More specifically, the container (2) comprises a bottom wall (2a) and a peripheral wall (2b) rising from the periphery of the bottom wall (2a). Further, the container (2) has a flange (2c) on the peripheral edge of the upper opening thereof. The flange (2c) has a flat shape that projects horizontally outward from the upper edge of the peripheral wall (2b) in the radial direction. The shape of the container may be any cup-shaped container having a flange, and is not limited to the one shown in the figure.
The lid (3) consists of a composite sheet (30) cut to a predetermined size and shape, and the peripheral edge of the lower surface thereof closes the upper opening of the container (2) filled with the contents (C). It is heat-sealed so that it can be peeled off from the upper surface of the flange (2c) of the container (2).
The heat-sealed portion (4) between the flange (2c) and the lid (3) of the container (2) has two parts spaced apart in the circumferential direction, and the opening strength is higher than the other parts. A difficult-to-open part (41) is provided. The two difficult-to-open portions (41) are each point-shaped, and one of the two halves (lower left in FIG. 1) obtained by dividing the heat-sealed portion (4) into approximately two equal parts in the circumferential direction. It is provided unevenly in the upper right half of the half and the upper right half).
The lid (3) has an opening tab (3a) on the required part of its peripheral edge, more specifically on the edge farthest from the two difficult-to-open portions (41) (lower left edge in FIG. 1). Is provided. The opening tab (3a) has a substantially triangular shape when viewed from a plane formed so as to project radially outward from the above-mentioned portion of the lid (3), and the opening of the lid (3) is opened. Sometimes it can be picked up with fingers.

As shown in FIGS. 2 and 3, the composite sheet (20) constituting the container (2) has a metal foil layer (21) and a heat-sealing property laminated on the inner surface of the metal foil layer (21). It includes a resin layer (22) and an outer resin layer (23) laminated on the outer surface of the metal foil layer (21).
The metal foil layer (21) functions as a barrier layer that imparts a barrier property to gas, steam, etc. to the container (2), and for example, aluminum foil, iron foil, stainless steel foil, and copper foil are used. However, aluminum foil is preferably used. In the case of aluminum foil, either pure aluminum foil or aluminum alloy foil may be used, and either soft or hard foil may be used. For example, it is classified by JIS H4160 having an iron content of 0.3 to 1.5 wt%. Any A8000 series (particularly, A8079H or A8021H) annealed soft material (O material) has excellent moldability and can be preferably used. If necessary, a base treatment such as chromate treatment can be performed on one side or both sides of the metal foil layer (21). The thickness of the metal foil layer (21) is preferably 20 to 200 μm, more preferably 40 to 120 μm. By setting the thickness to 20 μm or more, the probability of pinhole occurrence is reduced, barrier properties can be ensured, and deep drawing properties can be obtained. By setting the thickness to 200 μm or less, it is possible to prevent the composite sheet from being torn due to the force applied during molding, and it is possible to obtain a light container.
The heat-sealing resin layer (22) constitutes the innermost layer of the container (2), in other words, the upper surface of the bottom wall (2a), the inner surface of the peripheral wall (2b), and the upper surface of the flange (2c). Therefore, it plays a role of protecting the metal foil layer (21) from the contents (C) and imparting heat-sealing property to the flange (2c) of the container (2). The heat-sealing resin layer (22) is composed of, for example, a general-purpose film such as a polyethylene resin (PE) film or a polypropylene resin (PP) film, or a composite film thereof. The thickness of the heat-bondable resin layer (22) is preferably 20 to 500 μm, more preferably 40 to 300 μm. The metal foil layer (21) and the heat-sealing resin layer (22) are bonded by using an adhesive such as a two-component curable polyester-polyurethane resin adhesive or a polyether-polyurethane resin adhesive. Will be done.
Examples of the outer resin layer (23) constituting the outer surface of the container (2) include a polyethylene terephthalate resin (PET) film, a polybutylene terephthalate resin (PBT) film, a polyamide resin (PA) film, and a polyethylene naphthalate resin (PEN). ) A highly versatile film such as a film, a polybutylene terephthalate resin (PBN) film, a polypropylene resin (PP) film, or a composite material thereof is used. The thickness of the outer resin layer (23) is preferably 3 to 300 μm, more preferably 20 to 100 μm. By setting the thickness to 3 μm or more, it is possible to prevent corrosion and stains on the metal foil layer (21). For joining the metal foil layer (21) and the outer resin layer (23), for example, an adhesive layer (not shown) such as a two-component curable polyester-polyurethane resin adhesive or a polyether-polyurethane resin adhesive is used. It is done through.

As shown in FIGS. 2 and 3, the composite sheet (30) constituting the lid (3) has a metal leaf layer (31) and a lower surface side of the metal foil layer (31) (inner surface side of the package (11)). ), A heat-sealing resin layer (34) for forming a difficult-to-open portion, an adhesive layer (33) for resealing , a heat-sealing resin layer (32), and an upper surface of a metal foil layer (31). It is composed of an outer resin layer (35) laminated on the side (outer surface side of the package (11)).
The metal foil layer (31) functions as a barrier layer that imparts barrier properties to the lid (3), and is composed of, for example, aluminum foil, stainless steel foil, copper foil, nickel foil, etc., but is preferable. , Aluminum foil is used. In the case of aluminum foil, either pure aluminum foil or aluminum alloy foil may be used, and either soft or hard may be used. For example, the annealed soft material (O material) of A8021 classified by JIS H4160 is preferable. Used.
The heat-fusing resin layer (32) constituting the lowermost layer (innermost layer) of the lid (3) imparts heat-sealing property to the lid (3) and contains a metal foil (31). It plays a role of protecting from the thing (C). The heat-sealing resin layer (32) is composed of, for example, a general-purpose film such as a polyethylene resin (PE) film or a polypropylene resin (PP) film, or a composite film thereof, but is preferably a container (preferably a container (PE). It is composed of the same material as the heat-sealing resin layer (22) of 2). The thickness of the heat-bondable resin layer (32) is preferably 15 to 200 μm, more preferably 30 to 60 μm. The heat-bondable resin layer (32) contains, if necessary, a coloring pigment such as titanium oxide, an antioxidant, a slip agent, an antistatic agent, an additive such as a stabilizer, calcium carbonate, clay, mica, and silica. Etc., fillers and deodorants may be added.
The resealing adhesive layer (33) laminated on the upper surface side (back surface side) of the heat-sealing resin layer (32) is for imparting resealability to the lid (3) after opening. The pressure-sensitive adhesive constituting the resealing pressure-sensitive adhesive layer (33) may be appropriately selected from acrylic resin-based, rubber-based, silicone-based, and urethane-based pressure-sensitive adhesives, depending on the pressure-sensitive adhesive strength required at the time of resealing. Things are used.
The heat-sealing resin layer (34) for forming a difficult-to-open portion, which is laminated between the metal foil layer (31) and the adhesive layer for resealing (33), has a difficult-to-open portion (4) on the heat-sealing portion (4). 41) for forming, preferably the same material as the heat-sealing resin layer (22) of the flange (2c) of the container (2), ie, for example, a polyethylene resin (PE) film. , A general-purpose film such as a polypropylene resin (PP) film, or a composite film thereof. The thickness of the heat-sealing resin layer (34) for forming a difficult-to-open portion is preferably 5 to 60 μm, more preferably 20 to 40 μm. This is because if the thickness is less than 5 μm, it is difficult to form a heat-sealing resin layer (34) for forming a difficult-to-open portion having a stable film thickness, and if the thickness is larger than 60 μm, the cost increases. The heat-sealing resin layer (34) for forming a difficult-to-open portion does not necessarily have to be formed on the lid (3) so as to cover the entire surface thereof, and at least the container of the lid (3) when viewed from a flat surface. It suffices to form it on the peripheral portion that overlaps with the flange (2c) of (2).
The outer resin layer (35) constituting the uppermost layer (outermost layer) of the lid (3) functions as a decorative layer or a protective layer, and is, for example, a polyethylene terephthalate resin (PET) film or a stretched nylon resin (ONy). ) A heat-resistant resin film such as a film is passed through an adhesive layer (not shown) such as a two-component curable polyester-urethane resin adhesive or a polyether-urethane resin adhesive to form a metal foil layer (31). It is formed by dry laminating on the upper surface (outer surface) of. Further, the outer resin layer (35) may be formed by a surface coat layer. The surface coat layer is formed by applying a coating agent, for example, a coating resin such as an epoxy resin, a nitrified cotton resin, an epoxy melamine resin, and a vinyl chloride-vinyl acetate copolymer resin in a solvent to the surface of a metal foil. It is formed by applying and drying.

As shown in FIG. 3, the difficult-to-open portion (41) provided in the heat-sealed portion (4) between the flange (2c) of the container (2) and the lid (3) is difficult to open the lid (3). It is formed by partially heat-sealing the heat-sealing resin layer (34) for forming a portion and the heat-sealing resin layer (22) of the flange (2c) of the container (2).
More specifically, for example, in the production line of the package (11), the heat-sealing resin layers (22) (32) on the laminated surface of the flange (2c) of the container (2) and the lid (3) are used with each other. After the first sealing step of heat-sealing, the heat-sealing resin layer (34) for forming the difficult-to-open portion of the lid (3) and the heat-sealing resin layer (22) of the flange (2c) of the container (2). By providing a second sealing process for spot heat fusion of It is formed. In the second sealing step, for example, with a backing plate arranged on the lower surface side of the flange (2 c ), a heating pin heated to a predetermined temperature should form a difficult-to-open portion (41) in the lid (3). By inserting the lid (3) into the location with a predetermined pressure from above, the heat-sealing resin layer (34) for forming the difficult-to-open portion of the lid (3) becomes the resealing adhesive layer (33) and the heat-sealing resin layer. It penetrates through (32) and comes into contact with the heat-sealing resin layer (22) of the flange (2c), and both (34) and (22) are locally heat-sealed.
The shape, size, and number of the difficult-to-open portion (41) are appropriately determined according to the required opening strength, the degree of partial opening (ratio of the non-peelable portion), and the like, but preferably as in this embodiment. In addition, two dot-shaped difficult-to-open portions (41) are provided at a required interval in the circumferential direction. Here, the "dot-like" includes not only a small circular shape as shown in FIG. 1 but also a polygon such as a triangle or a quadrangle. Further, in the second sealing step, instead of the heating pin, the straight strip-shaped tip edge of the vertical heating plate is pressed against the lid (3) so as to straddle the required two points of the heat fusion portion (4). One difficult-to-open portion may be formed, in which case the difficult-to-open portion is formed into a short strip having a width corresponding to the width of the tip edge of the heating plate (see FIG. 7).
The means for forming the difficult-to-open portion in the heat-sealed portion is not limited to the above, and other means may be used. For example, the flange (2c) and lid (3) of a heat-bonded container (2) may be partially crimped or secured with fasteners, or the flange (2c) of a container (2). It is also conceivable to form a difficult-to-open portion by partially bonding the metal foil layer (21) and the metal foil layer (31) of the lid (3) by ultrasonic bonding.
Regarding the arrangement of the difficult-to-open portion, in this embodiment, the two difficult-to-open portions (41) substantially rotate the heat-sealed portion (4) between the flange (2c) of the container (2) and the lid (3) in the circumferential direction. Since it is provided unevenly on one of the two halves (in Fig. 1, the lower left side and the upper right side of the upper right side), the opening tab (3a) is pulled up to cover (3). The degree of opening (opening area) at the time of opening can be relatively large, and the contents (C) such as solid matter can be easily taken out. However, for example, when the content is a small solid substance such as a liquid substance, a grain, or a powder, the opening tab is provided at a position opposite to that of FIG. 1 with the center of the lid (3) in between. It is also possible to use it with a small degree (opening area).

In the package (11) of the first embodiment, in the unopened state, the contents are provided by a container (2) and a lid (3) having a metal leaf layer (21) (31) having excellent barrier properties. Since (C) is hermetically packaged (see FIGS. 2 (a) and 3), the content (C) can be stored for a long period of time without deterioration.
Then, when the contents (C) are taken out in the required quantity and used, the opening tab (3a) of the lid (3) is picked up by a finger and pulled up, and the heat-sealing resin layer (32) of the lid (3) is pulled up. ) Breaks near the outer edge of the heat-sealed portion (4) between the flange (2c) of the container (2) and the lid (3), and the lid (3) reappears with the heat-sealed resin layer (32). After peeling from the adhesive layer (33) for sealing by an amount approximately equal to the width of the heat-sealed portion (4), the heat-sealed resin layer (32) of the lid (3) is attached to the heat-sealed portion (4). ) Breaks again near the inner edge, and the lid (3) is opened. The portion (32a) of the heat-sealing resin layer (32) separated from the lid (3) by breakage remains on the upper surface of the flange (2c) of the container (2). When the opening of the lid (3) reaches the two difficult-to-open parts (41), the resistance force that prevents the lid (3) from being pulled up is transmitted to the fingers, and the opening operation is stopped there. In this way, the lid (3) is not completely peeled off from the flange (2c) of the container (2), and a part of the lid (3) is not peeled off from the flange (2c) and remains integrated in a partially opened state. In this state, the required quantity of the contents (C) is taken out through the opening of the container (2).
After taking out the contents (C), stack it on the upper surface of the flange (2c) so that the opened part of the lid (3) is restored, and the adhesive for resealing formed by peeling and opening the lid (3). An annular exposed portion (33a) of the layer (33) is attached to the top surface of the flange (2c), thereby resealing the lid (3) and preserving the remaining contents (C) in a sealed state. It becomes possible to do.
When disposing of the package (11) by using up all the contents (C), pull the opening tab of the lid (3) strongly upward to make the difficult-to-open part (41), that is, the lid (3) difficult. Since the heat-sealed portion between the heat-sealed resin layer (34) for forming the opening portion and the heat-sealed resin layer (22) of the flange (2c) breaks, the entire lid (3) is peeled off from the flange of the container. Can be removed. That is, the container (2) and the lid (3) can be separated and disposed of, which facilitates recycling.

<Second embodiment>
FIG. 4 shows the package of the second embodiment according to the present invention.
The package (12) of this embodiment is substantially the same as the package (11) of the first embodiment shown in FIGS. 1 to 3 except for the following points.
That is, in the package (12) of FIG. 4, a curved difficult-to-open portion extending along the circumferential direction of the heat-sealed portion (4) between the flange (2c) of the container (2) and the lid (3). One (42) is provided. The length of the difficult-to-open portion (42) is about one-fourth to one-fifth of the circumference of the heat-sealed portion (4). In the case of the curved difficult-to-open portion (42) as shown in the figure, the area of the heat-sealed portion becomes large, which increases the opening strength, so that the lid (3) may be peeled off more than necessary when the lid (3) is opened. Less.

<Third embodiment>
FIG. 5 shows a package according to a third embodiment of the present invention.
The package (13) of this embodiment is substantially the same as the package (11) of the first embodiment shown in FIGS. 1 to 3 except for the following points.
That is, in the package (13) of FIG. 5, the two dot-shaped difficult-to-open portions (41) surround the heat-sealed portion (4) between the flange (2c) and the lid (3) of the container (2). It is provided at a location that is almost equally divided in the direction. In addition, two difficult-to-open parts are provided in each of the two half parts (lower left half part and upper right half part in FIG. 5) of the lid (3), which is approximately bisected by a straight line connecting the two difficult-to-open parts (41). Opening tabs (3a) are provided at the edges farthest from the portion (41) (lower left and upper right edges in FIG. 5). That is, in the package (13) of this embodiment, the lid (3) can be opened in half from two directions.
Therefore, according to the package (13) of this embodiment, for example, by opening one half of the package and repeating resealing, the adhesive strength of the exposed portion (33a) of the resealing adhesive layer (33) is reduced. At that point, the other half can be opened and resealed instead of one half, and it can be used as a resealable lid for a longer period of time. Can be retained.

<Fourth Embodiment>
FIG. 6 shows the package of the fourth embodiment according to the present invention. The package of this embodiment is particularly preferably used in an application in which cosmetics, chemicals, or the like are filled and packaged as contents and carried when traveling or the like.
As shown in FIG. 6, the package (14) is a multi-unit type in which four packages (140) are integrally connected. More specifically, in the illustrated multi-packet (14), the four containers (2) are integrally molded so as to be arranged vertically and horizontally two by two when viewed from a plane, and the four containers (2) are integrally molded. The lid (3) that closes the opening is composed of one continuous composite sheet (30).

The four containers (2) are formed by overhanging one composite sheet (20), and each has a shallow cup shape or a dish shape of the same shape and size. Specifically, each container (2) has a bottom wall (2a) that is circular when viewed from a plane, and a peripheral wall (2b) that rises from the peripheral edge of the bottom wall (2a). Further, each container (2) has a flange (2c) on the peripheral edge of the opening. The flange (2c) has a substantially triangular shape in the portion near the connecting center of the four containers (2) when viewed from the plane protruding toward the center, and the remaining portion is in the opening peripheral edge of the container (2). It is a ring road along the ring. Then, the four containers (2) are integrated by connecting the straight sides of the overhanging portion of the flange (2c) in the containers (2) adjacent to the front, back, left and right. A cut (24) for separating the container (2) for each unit is formed at the connecting portion between the flanges (2c) of the container (2).
The composite sheet (30) constituting the lid (3) is substantially petal-shaped when viewed from a plane having a shape and size sufficient to close the openings of the four containers (2), and is connected to each other. It is heat-sealed across the upper surfaces of the flanges (2c) of the four containers (2). In addition, the composite sheet (30) has a lid (30) corresponding to the single container (2) at the location corresponding to the cut (24) formed in the flange (2c) of the container (2). Perforations (301) for separating each 3) are formed.
Each lid (3) is provided with a heat-sealed opening tab (3a) on the upper surface of the overhanging portion of the flange (2c) of each container (2). Although not shown, an arc-shaped cut is formed at the base of the overhanging portion of the flange (2c) of each container (2) to separate the same portion from the other portion of the flange (2c).

The composition of the composite sheet (20) used as the material of the container (2) and the composite sheet (30) used as the material of the lid (3) is substantially the same as those of the first embodiment, but the container (2) For the composite sheet (20) for molding), it is necessary to continuously and integrally mold a plurality of (four in this case) containers (2), and compared with the above-mentioned single container, at the time of molding. The cost is high because power (molding force) is required. In order to suppress this power, the film thickness of the material is thinner than that of a single container. In particular, in the case of the shape shown in FIG. 6, the thickness of the outer resin layer (23) is preferably 3 to 300 μm, more preferably 10 to 50 μm.
Then, in each package (140), two dot-shaped difficult-to-open portions (41) are spaced apart in the circumferential direction at the heat-sealed portion between the flange (2c) of the container (2) and the lid (3). It is formed at the same time. The two difficult-to-open portions (41) are provided on the opposite side of the lid (3) from the opening tab (3a) with the center of the lid (3) interposed therebetween. In other words, the opening tab (3a) is formed at the edge of the peripheral edge of the lid (3) farthest from the two difficult-to-open portions (41). The structure of the difficult-to-open portion (41) and the means for forming the same are substantially the same as those in the first embodiment.

In the case of the above-mentioned package (14), first, one package (140) is separated from the connected and integrated state at the time of use. That is, the flange (2c) and lid (3) of the container (2) of the package (140) to be separated are attached to the flange (2c) and lid (2c) of the container (2) of the package (140) adjacent to the front, back, left and right. At the cut (24) and the perforation surface (301) between (3) and the perforation surface (301), the flange (2c) and the lid (3) are cut at the place by applying a force by hand so as to tear, and 1 One package (140) is separated from the other package (140).
Then, the opening tab (3a) of the lid (3) of the separated package (140) is picked up by a finger together with the overhanging portion of the flange (2c) of the container (2) to which it is sealed and bent upward. , The overhanging part of the flange (2c) is broken and separated from the rest. Then, when the opening tab (3a) is pulled up as it is, the lid (3) partially opens up to the two difficult-to-open portions (41), and through the opening of the container (2) formed thereby, the lid (3) is partially opened. The contents can be taken out. The resealing of the lid (3) after taking out the contents and the separation of the container (2) and the lid (3) after the contents are used up are the same as those of the package (11) of the first embodiment. Can be done.

<Fifth Embodiment>
7 and 8 show the packaging of the fifth embodiment according to the present invention.
The package (15) of this embodiment is substantially the same as the package (11) of the first embodiment shown in FIGS. 1 to 3 except for the following points.
That is, as shown in FIG. 7, in the package (15) of this embodiment, the composite sheet (20X) constituting the container (2) has a metal leaf layer (21) and a metal leaf layer (21). A heat-sealing resin layer (25) for forming a difficult-to-open portion, an adhesive layer (26) for resealing , a heat-sealing resin layer (22), and a metal foil layer (21), which are sequentially laminated on the inner surface side of the above. It is composed of an outer resin layer (23) laminated on the outer surface of the above.
On the other hand, the composite sheet (30X) constituting the lid (3) is heat-sealed laminated on the metal foil layer (31) and the lower surface side (inner surface side of the package (15)) of the metal foil layer (31). It is composed of a sex resin layer (32) and an outer resin layer (35) laminated on the upper surface side (outer surface side of the package (15)) of the metal foil layer (31).
Then, as shown in FIG. 8, the difficult-to-open portion (41X) provided in the heat-sealing portion (4) between the flange (2c) of the container (2) and the lid (3) is the container (2). It is formed by partially heat-sealing the heat-sealing resin layer (25) for forming a difficult-to-open portion of the flange (2c) and the heat-sealing resin layer (22) of the lid (3). ..

In the above package (15), when the contents (C) are taken out in the required quantity and used, the opening tab of the lid (3) is picked up by hand and pulled up, and the flange of the container (2) is used. The heat-sealing resin layer (22) of (2c) broke near the outer edge of the heat-sealing portion (4) between the flange (2c) of the container (2) and the lid (3), and the flange (2c) Is peeled off between the heat-sealing resin layer (22) and the adhesive layer for resealing (26) by an amount approximately equal to the width of the heat-sealing portion (4), and then the heat-sealing property of the flange (2c). The resin layer (22) breaks again near the inner edge of the heat-sealed portion (4), and the lid (3) is opened. The portion (22a) of the heat-sealing resin layer (22) separated from the flange (2c) by breakage accompanies the lid (3). When the opening of the lid (3) reaches the points of the two difficult-to-open parts (41X), the resistance force that prevents the lid (3) from being pulled up is transmitted to the fingers, and the opening operation is stopped there. In this way, the lid (3) is not completely peeled off from the flange (2c) of the container (2), and a part of the lid (3) is not peeled off from the flange (2c) and remains integrated in a partially opened state.
After taking out the contents (C), stack the opened part of the lid (3) on the upper surface of the flange (2c) so as to put it back, and the adhesive for resealing formed by peeling and opening the lid (3). An annular exposed portion (26a) of the layer (26) is attached to the underside of the lid (3), thereby resealing the lid (3) and preserving the remaining contents (C) in a sealed state. It becomes possible to do.
When disposing of the package (11) by using up all the contents (C), pull the opening tab of the lid (3) strongly upward to open the difficult-to-open part (41X), that is, the flange of the container (2). Since the heat-sealed portion between the heat-sealed resin layer (25) for forming the difficult-to-open portion of (2c ) and the heat-sealed resin layer (32) of the lid (3) breaks, the entire lid (3) is covered. It can be removed by peeling from the flange of the container.

Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.

<Making a container>
An aluminum foil having a thickness of 120 μm made of A8021H-O classified by JIS H4160 was prepared. A chemical conversion film was formed on the surface of the aluminum foil by performing chromate treatment. Then, a polyethylene resin (PE) film having a thickness of 300 μm as a heat-sealing resin layer is dry-laminated on one side of the aluminum foil using a polyester-based urethane adhesive, and an outer resin is placed on the other side of the aluminum foil. As a layer, a non-stretched polypropylene resin (CPP) film having a thickness of 30 μm was dry-laminated using a polyester-based urethane adhesive to prepare a composite sheet for a container.
Next, the obtained composite sheet was cut into a predetermined size and shape to form a blank, and the blank was deep-drawn into a cup shape to prepare a container (2) having a flange (2c) (Fig.). 9).

<Making a lid>
An aluminum foil having a thickness of 20 μm made of A1N30H-O classified by JIS H4160 was prepared. A chemical conversion film was formed on the surface of the aluminum foil by performing chromate treatment. Then, a polyethylene resin (PE) film having a thickness of 35 μm is dry-laminated on one side of the aluminum foil as a heat-sealing resin layer for forming a difficult-to-open portion using a polyester-based urethane adhesive, and the aluminum foil is also used. A polyethylene terephthalate resin (PET) film having a thickness of 12 μm was dry-laminated on the surface as an outer resin layer using a polyester-based urethane adhesive. Further, the surface of the polyethylene resin (PE) film is gravure-coated with a rubber-based pressure-sensitive adhesive as an adhesive layer for resealing to a thickness of 10 μm, and polyethylene having a thickness of 20 μm as a heat-sealing resin layer is further coated on the surface. A resin (PE) film was attached. In this way, a composite sheet used as a material for the lid was obtained.
The obtained composite sheet was cut into a predetermined size and shape to prepare a lid (3) having an opening tab (3a) as shown in FIG.

<Example 1>
The lid (3) is placed on the upper surface of the flange (2c) of the container (2) obtained as described above, and as the first sealing step, the conditions are a heating temperature of 160 ° C., a pressing force of 120 kgf, and a heating and pressurizing time of 2 seconds. Then, after heat-sealing (heat-sealing) the polymerized surfaces of both (2c) and (3), as a second sealing step, the heating temperature is 170 ° C. at two of the heat-sealed parts shown in FIG. A polyethylene resin (PE) film on the flange (2c) of the container (2) by performing heat sealing (heat fusion) with a sealing width (W) of 5 mm under the conditions of a pressing force of 80 kgf and a heating and pressurizing time of 10 seconds. The (heat-fused resin layer) and the polyethylene resin (PE) film (heat-fused resin layer for forming the difficult-to-open portion) of the lid (3) are heat-sealed to form two difficult-to-open portions (41). did. In this way, the package (11) of Example 1 was obtained.

<Comparative Example 1>
A package was prepared in the same manner as in Example 1 except that the second sealing step was not performed, and this was designated as Comparative Example 1.

<Test of opening strength and sealing property after resealing>
Five packages (11) of Example 1 are prepared, and for each package (11), the tab (3a) of the lid (3) is first pulled up to the two difficult-to-open portions (41). After the partial opening, the lid (3) was placed on the flange (2c) so as to be replaced, and the flange (2c) was lightly pressed with a finger from above so as to trace one round. In this state, the opening strength of the lid (3) after resealing was measured. The opening strength is 100 mm / min at a 45 ° angle by grasping the tab (3a) of the lid (3) with a tensile tester (Universal Material Testing Machine manufactured by Tensilon), up to the front of the difficult-to-open part (41). The maximum strength at the time of opening is measured as the tensile strength (the same applies hereinafter). The lid (3) was resealed a total of 10 times in the same manner from the second time onward, and the opening strength was measured each time. After the 10th resealing, the lid (3) is opened, 50cc of water is put in the container (2), and then the container (2) is resealed. In this state, the package (11) is tilted by about 90 ° to check for water leakage. It was confirmed visually.
Similarly, five packages of Comparative Example 1 are prepared, and for each package, the tab of the lid is first pulled up, the lid is fully opened, and then the lid is placed on the flange so as to be replaced from above. I lightly pressed the flange with my finger so that it would trace one round. In this state, the opening strength of the lid after resealing was measured. The lid was resealed a total of 10 times in the same manner from the second time onward, and the opening strength was measured for each time. After the 10th resealing, the lid was opened, 50 cc of water was put into the container, and then the container was resealed. In this state, the package was tilted by about 90 ° and the presence or absence of water leakage was visually confirmed.
The results are shown in Table 1. In the item of "water leak", "○" indicates that there was no leak, and "x" indicates that there was a leak.

As is clear from Table 1, in the package (11) of Example 1, the opening strength did not decrease and no water leakage occurred even when the number of resealing was 10 times.

<Example 2>
As the second sealing step, two difficult-to-open portions (41) were formed by performing heat sealing (heat fusion) with a seal width (W) of 3 mm at two locations shown in FIG. 9 of the heat-sealed portions. A package was prepared in the same manner as in Example 1 except for the points, and this was designated as Example 2.

<Example 3>
As the second sealing step, two difficult-to-open portions (41) were formed by performing heat sealing (heat fusion) with a seal width (W) of 1 mm at two locations shown in FIG. 9 of the heat-sealed portions. A package was prepared in the same manner as in Example 1 except for the points, and this was designated as Example 3.

<Test of opening strength by size of difficult-to-open part>
Three packages of Examples 1 to 3 are prepared, and for each package, the opening strength at the base of the opening tab (3a) at the initial stage of opening, the opening strength during opening, and the difficult-to-open portion (41) (line). The opening strength at the seal part) was measured. The results are shown in Table 2.

As shown in Table 2, in Examples 1 and 2 in which the width (W) of the wire seal portion (difficult to open portion (41)) is 5 mm and 3 mm, the opening strength of the wire sealing portion is the opening strength in the middle. Since it is about 2 to 3 times, it is possible to surely put it in a partially opened state without accidentally completely peeling off the lid. On the other hand, in the case of Example 3 in which the width (W) of the wire seal portion is 1 mm, the opening strength of the wire seal portion is only slightly higher than the opening strength in the middle, so that the lid is opened carelessly. There is a risk of complete peeling.

INDUSTRIAL APPLICABILITY The present invention can be suitably used as a package for resealable and hermetically sealed and packaged contents such as foods and cosmetics that need to be stored for a long period of time and cannot be used up all at once by using a container and a lid.

(11) (12) (13) (14) (15): Package
(2): Container
(2c): Flange part
(20) (20X): Composite sheet
(21): Metal leaf layer
(22): Heat-sealing resin layer
(25): Heat-sealing resin layer for forming a difficult-to-open portion
(26): Adhesive layer for resealing
(3): Cover
(3a): Opening tab
(30) (30X): Composite sheet
(31): Metal leaf layer
(32): Heat-sealing resin layer
(33): Adhesive layer for resealing
(34): Heat-sealing resin layer for forming a difficult-to-open portion
(4): Heat fusion part
(41) (41X) (42): Difficult to open part
(C): Contents

Claims (10)

A container having a flange on the peripheral edge of the opening and a lid that is heat-sealed to the flange so as to close the opening of the container filled with the contents are provided, and the upper surface of the container flange is heated. In addition to being composed of a fused resin layer, the lower surface of the lid is composed of a heat-sealed resin layer of the flange of the container and a heat-sealed resin layer capable of heat-sealing, and the lid is heat-sealed. A resealing adhesive layer laminated on the back surface side of the sex resin layer is provided, and the heat-sealed portion between the flange and the lid of the container is a part in the circumferential direction or a plurality of portions spaced in the circumferential direction. Is provided with a difficult-to-open part with higher opening strength than other parts.
The lid is further provided with a heat-sealing resin layer for forming a difficult-to-open portion laminated on the opposite side of the heat-sealing resin layer with the adhesive layer for resealing sandwiched therein, and the difficult-to-open portion is a difficult-to-open lid. It is formed by partially heat-sealing the heat-sealing resin layer for forming a portion and the heat-sealing resin layer of the flange of the container.
A resealable package in which the heat-sealing resin layer for forming the difficult-to-open portion of the lid and the heat-sealing resin layer of the flange of the container are made of the same resin material. All the difficult-to-open parts are provided unevenly on one of the two halves that divide the heat-sealed part between the flange of the container and the lid into approximately two equal parts in the circumferential direction, and all the difficult-to-open parts on the lid are provided. The resealable package according to claim 1, wherein an opening tab is provided at the edge farthest from the portion. The resealable package according to claim 1 or 2, wherein the difficult-to-open portion is provided in dots at two locations in the heat-sealed portion between the flange and the lid of the container, which are spaced apart from each other in the circumferential direction. body. It is equipped with a container having a flange on the peripheral edge of the opening and a lid that is heat-sealed to the flange so as to close the opening of the container filled with the contents, and the upper surface of the flange of the container is heated. In addition to being composed of a fused resin layer, the lower surface of the lid is composed of a heat-sealed resin layer of the flange of the container and a heat-sealed resin layer capable of heat-sealing, and the lid is heat-sealed. An adhesive layer for resealing laminated on the back surface side of the sex resin layer is provided, and the heat-sealed portion between the flange and the lid of the container is located at a position where the heat-sealed portion is roughly divided into two in the circumferential direction. , Two difficult-to-open parts with higher opening strength than the other parts are provided in dots.
Resealable, each of the two halves of the lid, approximately bisected by a straight line connecting the two difficult-to-open parts, with an opening tab at the farthest edge from the two difficult-to-open parts. Package. The resealable package according to any one of claims 1 to 4, which is designed to be peeled off at the interface between the heat-sealing resin layer of the lid and the adhesive layer for resealing at the time of opening. A container having a flange on the peripheral edge of the opening and a lid that is heat-sealed to the flange so as to close the opening of the container filled with the contents are provided, and the upper surface of the container flange is heated. In addition to being composed of a fusion resin layer, the lower surface of the lid is composed of a heat fusion resin layer of the container flange and a heat fusion resin layer capable of heat fusion, and the container flange is heated. It is provided with an adhesive layer for resealing laminated on the back surface side of the fusible resin layer, and the heat-sealed portion between the flange and the lid of the container is a part of the circumferential direction or a plurality of spaces spaced in the circumferential direction. A difficult-to-open part with higher opening strength than other parts is provided in this part.
The flange of the container is further provided with a heat-sealing resin layer for forming a difficult-to-open portion, which is laminated on the opposite side of the heat-sealing resin layer with the adhesive layer for resealing sandwiched therein. It is formed by partially heat-sealing the heat-sealing resin layer for forming a difficult-to-open portion of the flange and the heat-sealing resin layer of the lid.
A resealable package in which the heat-sealing resin layer for forming a difficult-to-open portion of the flange of the container and the heat-sealing resin layer of the lid are made of the same resin material. All the difficult-to-open parts are provided unevenly on one of the two halves that divide the heat-sealed part between the flange of the container and the lid into approximately two equal parts in the circumferential direction, and all the difficult-to-open parts on the lid are provided. The resealable package according to claim 6, wherein an opening tab is provided at the edge farthest from the portion. 6. body. The resealable package according to any one of claims 6 to 8 , which is designed to be peeled off at the interface between the heat-sealing resin layer of the flange of the container and the adhesive layer for resealing at the time of opening. .. The resealable package according to any one of claims 1 to 9 , wherein each of the container and the lid further comprises a metal leaf layer.

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