JP2019005983A - Antifogging sheet, molded body and container - Google Patents

Abstract

To provide an antifogging sheet capable of adding both of antifogging effect and bondability, a molded body, a container and a manufacturing method of the antifogging sheet.SOLUTION: There is provided a transparent antifogging sheet having a zone capable of forming a joint part by joint with a part to be jointed, having a substrate layer 31, a joint layer 32 which is lamination formed on the substrate layer 31 and can be delaminated or aggregation detached between the substrate layer 31 and itself, and an antifogging layer 33 lamination formed on the joint layer 32 and consisting of a resin composition containing an antifogging agent, in which the joint layer 32 in a zone 39 capable of forming the joint part is delaminated or aggregation detached and the antifogging layer 33 is removed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an antifogging sheet, a molded body, and a container.

  2. Description of the Related Art A structure having a transparent lid that can visually recognize food is known as a package for packaging food. As such a container, a container that has been subjected to an anti-fogging treatment so that food can be visually recognized even after cooking (for example, Patent Document 1 or Patent Document 2).

The one described in Patent Document 1 obtains an antifogging sheet by applying a mixed aqueous solution of an antifogging agent and a binder resin on one surface of a polyolefin resin sheet formed by rapid cooling to provide an antifogging layer. A lid is formed from the cloudy sheet.
In the one described in Patent Document 2, an antifogging layer is provided on one surface of a polyolefin sheet by applying a composition containing an antifogging agent and two or more hydrophilic resins having different glass transition temperatures, A lid or the like is formed from the obtained antifogging sheet.

JP 2010-180407 A Japanese Patent Laying-Open No. 2015-231718

The thing of the said patent document 1 and the patent document 2 can provide sufficient anti-fogging effect.
On the other hand, in a container provided with a container body and a lid, it is desired that the package is packaged so as not to leak during transportation.
An object of this invention is to provide the anti-fogging sheet | seat which can provide both an anti-fogging effect and bondability, a molded object, and a container.

One aspect of the antifogging sheet of the present invention is a transparent antifogging sheet having a region where a bonded portion can be formed by bonding to a bonded portion, and is formed by laminating a base material layer and the base material layer. And a bonding layer capable of delamination or cohesive peeling between the base material layer and an antifogging layer formed by laminating the bonding layer and comprising a resin composition containing an antifogging agent, The bonding layer in the region is delaminated or agglomerated and the antifogging layer is removed.
In this one aspect, the antifogging layer is removed by delamination or cohesive peeling of the bonding layer in the region where the bonded portion can be formed by bonding with the bonded portion. For this reason, for example, when forming a container main body and a lid from an antifogging sheet, the antifogging layer is removed by removing the antifogging layer from the flange portion of the container main body and the flange portion of the lid that are joined together. It can join by a normal method, without being inhibited, and can also provide the anti-fogging effect by an anti-fog layer.

Here, the bonded portion is, for example, a lid flange when the molded body is a container body, and a flange portion of the container body when the molded body is a lid. In the case of forming, it is the joining region of the mating antifogging sheet that is overlapped and joined.
In addition, the bonding is not limited to heat sealing, and various methods such as welding by ultrasonic waves and adhesion using an adhesive can be used.
And the transparency should just be a grade which can visually recognize the to-be packaged object packed by the container main body and the lid | cover through the container main body and the lid | cover, for example. Specifically, the total haze of the antifogging sheet is, for example, 50% or less, preferably 30% or less, particularly preferably 10% or less. By setting the total haze to the above range, the packaged object can be visually recognized, and the state of the packaged object can be determined.

One aspect of the antifogging sheet of the present invention is a transparent antifogging sheet having a region where a bonded portion can be formed by bonding to a bonded portion, and is formed by laminating a base material layer and the base material layer. And a bonding layer capable of delamination or cohesive peeling between the base material layer and an antifogging layer formed by laminating the bonding layer and comprising a resin composition containing an antifogging agent, The bonding layer and the anti-fogging layer are provided between the region and the other region, and are provided with weakened portions so as to be able to cut the bonding layer and the anti-fogging layer, respectively. .
In this embodiment, in the region where the joint can be formed by joining with the joined portion, the joint layer and the antifogging layer are respectively cut at the weakened portion, and the joint layer is delaminated or cohesively peeled together with the antifogging layer. The cloud layer can be removed. By this, for example, after removing the antifogging layer at the portion corresponding to the region where the joint portion of the antifogging sheet can be formed, or after forming the container main body or lid, or from the antifogging sheet, the container main body or lid is removed. After the molding, when the antifogging layer is removed at a portion corresponding to the region where the joint portion can be formed, the antifogging layer is not provided on the flange portion of the container main body or the lid portion of the lid to be joined together. For this reason, it can join with a to-be-joined part by a normal method, without being obstructed by an antifogging layer, and can also give the antifogging effect by an antifogging layer.

  Here, the weakened portion is, for example, a structure in which concave portions such as so-called notches that are cut into a V-shaped cross section or a U-shaped cross section in the thickness direction of the bonding layer and the antifogging layer, a so-called perforation, are continuous. The structure which cut | disconnects a joining layer and an anti-fogging layer can be illustrated, such as the structure formed with the material softer than the other part of a layer and an anti-fogging layer, and easy to cut | disconnect.

In the aspect of the invention, the weakened portion may be a notch formed by cutting in the thickness direction of the bonding layer and the antifogging layer.
In this embodiment, by providing a notch with a simple configuration in which the layer is cut in the thickness direction, a part of the bonding layer and the antifogging layer can be delaminated or agglomerated and the antifogging layer can be easily removed. It is done.

Moreover, in one aspect of the present invention, a transparent molded body having a flange having an area where a bonded portion is formed by bonding with a bonded portion, the bonded layer being delaminated or agglomerated peeled It can also be set as the structure used for shaping | molding of the said molded object in the state in which the part to be located is located in the said area | region.
In this one aspect, by using it for molding a transparent molded body having a flange on the outer periphery so that it can be joined to the joined portion, the molded body can be provided with bonding properties together with an antifogging effect.

Here, a molded object is a container main body, a lid, etc. which comprise a container, for example. The container body is not limited to a pair of a container body and a lid. For example, a container in which a bonded portion is interposed between the container body and the lid, a container body of the same shape or a container with a pair of lids, It can also be applied to a bag structure in which antifogging sheets are stacked.
Further, the flange is, for example, a flange portion to which the flange portion of the lid is joined when the molded body is a container body, and a flange portion to which the flange portion of the container body is bonded when the molded body is a lid.
And an outer peripheral part is a peripheral part along the outer periphery of a molded object. This includes not only the case where the joint portions are provided over the entire circumference of the outer peripheral portion but also the case where the joint portions are provided so as to be scattered in the circumferential direction.

Furthermore, in one embodiment of the present invention, a structure where the bonding layer is delaminated or agglomerated and peeled may be annular.
In this one aspect, the antifogging layer can be easily removed from the bonded region by peeling the bonding layer in a ring shape and removing the antifogging layer.

One aspect of the molded body of the present invention includes a base material layer, a laminate layer formed on the base material layer, a debonding layer that can be delaminated or agglomerated between the base material layer, and a laminate layer formed on the bonding layer. And an anti-fogging sheet comprising an anti-fogging layer made of a resin composition containing an anti-fogging agent is formed, and a transparent flange having a flange that can form a joint portion by joining with a joined portion on the outer peripheral portion. In the molded body, the bonding layer is delaminated or cohesively peeled together with the anti-fogging layer in at least the region of the joint portion of the flange.
In this one aspect, for example, when the molded body is a container main body or a lid, the antifogging layer is removed from the flange portion of the container main body or the flange portion of the lid. From this, while being able to join a flange part and a collar part by a normal method, without being inhibited with an anti-fogging layer, an anti-fogging effect can also be provided with an anti-fogging layer.

In one aspect of the molded body of the present invention, the antifogging sheet of the present invention is molded, and is a transparent molded body having a flange on the outer peripheral portion capable of forming a bonded portion by bonding with a bonded portion, The flange is formed in a state where a portion where the layers are delaminated or coherently separated is located in a region corresponding to the joint.
In this embodiment, the molded body is molded using an antifogging sheet from which the antifogging layer has been removed or has a weakened portion so that the antifogging layer can be removed. Can be granted.

And in 1 aspect of this invention, it can also be set as the structure which is a lid | cover with the collar part joined to the flange part of a container main body and which can shape | mold a junction part.
In this one aspect, by using the molded body as a lid, the antifogging effect by the antifogging layer can be obtained, and the sealing performance by joining with the container body can be improved.

In one embodiment of the present invention, the molded body of the present invention is provided.
In this one aspect, the sealing property by joining with the lid or the container main body is obtained together with the anti-fogging effect.

Sectional drawing which shows the container which concerns on one Embodiment provided with the lid | cover (molded object) of this invention. Sectional drawing which shows the anti-fog sheet | seat in other embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Container configuration]
As shown in FIG. 1, the container 1 includes a container body 2 and a lid 3 subjected to an antifogging process.
In addition, as a container demonstrated by this embodiment, the structure opened by the delamination which provided the notch, for example, the structure opened by the cohesive peeling which does not provide a notch, etc. are selected suitably.

The container body 2 is formed by molding a multilayer sheet, specifically, by heating, and is a laminate in which two layers of a peeling layer 21 and a front lower layer 22 are laminated in this order.
The container body 2 has a substantially circular cup shape having a predetermined depth, and extends outwardly from the storage recess 24 that opens the substantially circular opening 24A and the periphery of the opening 24A of the storage recess 24. And a flange portion 25 provided to extend.
Further, an opening start end (not shown) that protrudes in the form of a tongue piece in the outer peripheral direction extends from a part of the outer peripheral edge of the flange portion 25.

The release layer 21 is a layer that comes into contact with an object to be packaged enclosed in the container 1 and is heat-sealed with the sealant of the lid 3. Although details will be described later, the heat seal portion (not shown) heat-sealed with the lid 3 is peeled from the container body 2 together with the lid 3.
As the peeling layer 21, for example, a material heat-sealed with the lid 3, preferably a polyolefin-based resin is suitably used. Specifically, polypropylene resins such as homopolypropylene (HPP), random polypropylene (RPP) and block polypropylene, polyethylene resins such as high density polyethylene (HDPE) and low density polyethylene (LDPE), linear ethylene- An α-olefin copolymer or the like is used.

The front lower layer 22 constitutes a lower layer of the release layer 21 adjacent to the release layer 21, and is delaminated with the release layer 21 when the container 1 is opened.
As a specific material constituting the upper and lower layer 22, for example, it is preferable that the material is composed of at least one selected from the group of olefin resin, polystyrene resin, and polyester resin.
As the olefin resin, specifically, polypropylene, polyethylene or the like is used. In particular, polypropylene is preferably used because it is widely distributed and easily available, is inexpensive, and has high strength.
Specific examples of the polystyrene-based resin include general-purpose transparent and rigid GP grade polystyrene, and impact-resistant HI grade polystyrene. In particular, HI grade polystyrene is suitably used from the viewpoint of impact resistance required when used as a container or the like.
As the polyester resin, specifically, amorphous polyester, crystalline polyester, or the like is used, and amorphous polyester is particularly preferably used for reasons of processability.

In particular, as the surface lower layer 22, a polymer containing at least a part of a propylene unit (hereinafter referred to as a polypropylene resin, and appropriately referred to as PP) and a polymer containing an ethylene unit at least in a part (hereinafter referred to as a polyethylene resin) (PP: PE) = (30% by mass or more and 99% by mass or less: 1% by mass or more and 70% by mass or less) can be used. In addition, as the surface lower layer 22, what made the polypropylene resin 100 mass%, for example may be used.
Here, when mass ratio PP / PE becomes smaller than 0.67, there exists a possibility that the problem that the resin pool may generate | occur | produce at the time of heat sealing, and the unseal | opening failure will generate | occur | produce. In particular, when the mass ratio PP / PE is less than 0.429, rigidity may be insufficient, and when the mass ratio PP / PE is more than 99, flexibility may be insufficient.
The polypropylene resin is specifically selected from any of four types of homopolypropylene, random polypropylene, block polypropylene, and mixtures thereof. And when heat resistance is considered, it is preferable in order of a homo polypropylene, a block polypropylene, and a random polypropylene. Moreover, when considering the sealing properties with other layers, random polypropylene, block polypropylene, and homopolypropylene are preferable in this order.
As the polyethylene resin, specifically, high-density polyethylene, low-density polyethylene, or the like is used. In particular, low density polyethylene is suitably used for reasons of molding process stability.

Note that an inorganic filler such as talc may be added to the front and lower layers 22.
Moreover, although the surface lower layer 22 is laminated | stacked directly adjacent to the peeling layer 21, between the peeling layer 21 and the surface lower layer 22, it does not flow by heat seals, such as an adhesive layer, or is comparatively difficult to flow. A thin layer may be provided.

The thickness of the flange portion 25 of the container body 2 is preferably 200 μm or more and 2000 μm or less, more preferably 250 μm or more and 600 μm or less, and particularly preferably 300 μm or more and 500 μm or less.
Here, when the thickness of the flange portion 25 is thinner than 200 μm, there is a possibility that the inconvenience that the rigidity of the container is lowered is caused. On the other hand, if the thickness of the flange portion 25 is greater than 2000 μm, a large amount of material is required, which may cause a disadvantage that the manufacturing cost (raw material cost) increases. From this, the thickness dimension of the flange part 25 of the container main body 2 is set to the said range.

The lid 3 is formed by molding a transparent antifogging sheet, specifically by heating. The lid 3 includes a base material layer 31 that appears outside the container 1, a joining layer 32 joined to the base material layer 31, and an antifogging layer 33 that is laminated on the joining layer 32 and faces the storage recess 24 of the container body 2. Is a laminated body laminated in these order.
The lid 3 has a substantially circular dome shape having a predetermined height, and has a dome part 35 that covers the opening 24A of the container body 2 in a substantially circular shape. A flange 36 as a flange is provided so as to overhang. The anti-fogging layer 33 is provided only in the dome portion 35 that is an inner peripheral side region from the flange portion 36. That is, the haze part 36 is not provided with the antifogging layer 33 removed. In addition, as removal of the anti-fogging layer 33 in the collar part 36, for example, a weakened part at a position corresponding to a region between the area to be heat-sealed and the other area, specifically, an inner peripheral side from the collar part 36. A notch 39 is provided. With this notch 39, the bonding layer 32 of the flange portion 36 may be agglomerated and peeled or delaminated between the bonding layer 32 and the base material layer 31, and the antifogging layer 33 may be removed together with the bonding layer 32.
Further, an opening start end (not shown) that protrudes in the shape of a tongue piece in the outer peripheral direction extends from a part of the outer peripheral edge of the collar portion 36.

For the base material layer 31, a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O-Ny), a polyolefin resin, or the like can be used.
Examples of the polyolefin resin include homopolymers, copolymers, and mixtures of various olefins. These may be used alone or in combination of two or more. Examples of the homopolymer include homopolymers composed of monomers such as ethylene, propylene, 1-butene, isoprene and butadiene. Examples of the copolymer include an ethylene-α-olefin copolymer, a propylene-α-olefin copolymer, an ethylene-vinyl acetate copolymer, and an ethylene-acrylic acid ester copolymer. Among these, polypropylene is preferable from the viewpoints of transparency and strength.
The bonding layer 32 can be made of a resin composition such as linear low density polyethylene (LLDPE). In addition, it is preferable to set the base material layer 31 and the bonding layer 32 to a composition that provides weak peel strength to such an extent that delamination can be easily performed between the base material layer 31 and the base material layer 31.

The antifogging layer 33 is formed by applying a resin composition in which an antifogging agent and a binder resin are mixed to the bonding layer 32.
The amount of adhesion of the antifogging agent is preferably 4 mg / m ² or more and 400 mg / m ² or less in terms of solid content, and more preferably 50 mg / m ² or more and 200 mg / m ² or less in terms of solid content. If the adhesion amount is within the above range, the antifogging property can be effectively exhibited.
The adhesion amount can be determined by (A) a method of measuring the mass per unit area in the antifogging layer 33 after drying, or (B) a method of calculating from the concentration, coating amount and coating area of the coating solution. it can.

The antifogging agent is not particularly limited, and examples thereof include sucrose fatty acid esters, glycerin fatty acid esters, fatty acid tertiary amides, higher alcohol fatty acid esters, and propylene glycol fatty acid esters. Among these, from the viewpoints of transparency and antifogging property, sucrose fatty acid esters are preferable, and partial ester compounds of sucrose and aliphatic monocarboxylic acids having 12 to 22 carbon atoms are more preferable. These may be used alone or in combination of two or more.
The binder resin is not particularly limited, but is preferably an acrylic adhesive, particularly from the viewpoint of transparency, moldability, and stickiness of the antifogging layer 33. Although there is no limitation in particular as a hydrophilic acrylic resin, Copolymers, such as polyacrylic acid ester, are employable. Here, examples of the acrylic ester constituting the polyacrylic ester include methyl ester, ethyl ester, butyl ester, octyl ester and 2-ethylhexyl ester of acrylic acid. A polymer obtained by copolymerizing these acrylic acid esters with methacrylic acid esters, styrene, acrylonitrile, vinyl chloride, vinyl acetate or the like can be employed. A polymer obtained by copolymerizing these acrylic acid esters with a functional monomer such as acrylic acid, acrylamide, methylol acrylamide, or hydroxydialkyl methacrylate can also be used.

The container 1 is formed by heat-sealing the flange portion 25 of the container body 2 and the flange portion 36 of the lid 3 placed on the flange portion 25. By this heat sealing, the peeling layer 21 and the base material layer 31 exposed at the flange portion 36 are fused to form an annular heat sealing portion, and the inside of the container 1 is sealed. Note that, when the peeling layer 21 and the base material layer 31 are fused, if the bonding layer 32 remains in some cases, the bonding layer 32 is fused.
In order to open the container 1 in a sealed state, the container 3 is pulled apart in the opposite directions at the opening start portion of the lid 3 and the opening start portion of the flange portion 25. Thereby, cohesive peeling and delamination occur in the heat seal part, and the container 1 is easily opened.

[Method of manufacturing lid]
Next, the manufacturing method of the lid | cover of this invention is demonstrated.
In manufacturing the lid 3, a sheet forming step for forming a multilayer sheet, a molding step for molding the lid 3 from the multilayer sheet, and an antifogging layer removing step for removing the antifogging layer 33 laminated on the flange portion 36 of the lid 3. And carry out.

  In the sheet forming step, the resin constituting the base layer 31 and the resin constituting the bonding layer 32 are extruded and laminated from the T-die of the extruder, and the rolls are pressed and rapidly cooled. A transparent sheet 51 is formed. A resin composition in which an antifogging agent and a binder resin are blended with the transparent sheet is applied by, for example, various printing methods to form the antifogging layer 33, thereby forming a multilayer sheet. As a printing method, a general printing method such as a screen printing method, an offset printing method, a gravure printing method, a roll coating method, or a spray coating method can be used.

The obtained multilayer sheet is sent to a molding process for molding the lid 3, and the lid 3 is sequentially molded. When the lid 3 is molded, the antifogging layer 33 is molded so as to be on the inner surface side of the dome portion 35. During this molding, a notch 39 is formed at the same time on the inner peripheral side of the heat-sealed region of the flange 36 (see the right side of FIG. 1).
When cutting the molded lid 3 from the multilayer sheet, for example, a male-female blade or a so-called Thomson blade is used. The multi-layer sheet is cut with a female blade or a Thomson blade from the surface on the base material layer 31 side opposite to the bonding layer 32 at a position corresponding to the outer peripheral edge of the flange portion 36, and the lid 3 is punched and formed. By this punching, in the subsequent antifogging layer removing step, the joining layer 32 can be easily peeled from the end face of the flange portion 36 of the lid 3, or the joining layer 32 can be easily peeled from the base material layer 31. Become.
As a method for forming the lid 3 from the multilayer sheet, a general forming method can be used.
Here, the depth dimension of the notch 39 is not particularly limited as long as the bonding layer 32 can be delaminated or coherently peeled in a post-fogging layer removing step. However, in order to satisfactorily delaminate the bonding layer 32, it is preferable that the depth reaches the base material layer 31, that is, a depth not less than the thickness dimension of the bonding layer 32. Specifically, the preferred depth dimension of the notch 39 is not less than the thickness dimension of the bonding layer 32 and not more than 50% of the thickness dimension of the base material layer 31.

The formed lid 3 is sent to the anti-fogging layer removing step, and the anti-fogging layer 33 laminated on the flange 36 is removed.
As the removal of the anti-fogging layer 33, for example, friction is applied to the end surface of the collar portion 36 of the lid 3 so as to peel off the bonding layer 32 such as an operator's hand or a rotating brush or a rotating roller. As a result, the bonding layer 32 is agglomerated and peeled, or the bonding layer 32 is peeled from the base material layer 31, and the antifogging layer 33 is removed (see the left side of FIG. 1).
In this way, the lid 3 from which the antifogging layer 33 has been partially removed is obtained.
Then, the obtained lid 3 is sent to a subsequent process, and the flange portion 36 from which the anti-fogging layer 33 is removed is heat-sealed to the flange portion 25 of the container main body 2, so that the container 1 in which an object to be packaged is accommodated. can get.

[Effect of the embodiment]
As described above, in the above-described embodiment, the bonding layer 32 is delaminated in the lid 3 that is formed from a transparent multilayer sheet and includes the flange portion 25 of the container body 2 and the flange portion 36 that includes a region to be heat sealed. Alternatively, the anti-fogging layer 33 is removed by cohesive peeling.
For this reason, when the lid 3 is heat-sealed to the container body 2, the anti-fogging layer 33 can be heat-sealed by a normal method without hindering. Therefore, the heat sealability between the container body 2 and the lid 3 can be imparted together with the antifogging effect.

And in the said embodiment, after shape | molding the lid | cover 3 from a multilayer sheet, the joining layer 32 is peeled and the anti-fogging layer 33 is removed.
For this reason, it is possible to easily remove the anti-fogging layer 33 in the region to be heat sealed.

Moreover, in the said embodiment, in order to remove the anti-fogging layer 33 from the collar part 36, the notch 39 is provided.
For this reason, peeling of the joining layer 32 can be performed easily, and the anti-fogging layer 33 can be easily removed in the region to be heat-sealed.

[Modification]
Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the present invention has been described primarily with reference to specific embodiments, but with respect to the above-described embodiments without departing from the scope of the technical idea and object of the present invention, the material, quantity, and other details. In this configuration, those skilled in the art can make various modifications.
Therefore, the description which limited the material, layer structure, etc. which were disclosed above is described in order to facilitate understanding of the present invention, and does not limit the present invention. For this reason, the description by the name which remove | excluded the limitation of some or all of those materials etc. is included in this invention.

For example, in the above-described embodiment, the packaged items stored in the container 1 are not limited to foods, but are not limited to foods, medical instruments that are sterilized by heating, heated articles, articles that generate water vapor, and the like. Various packages such as liquids and mixtures thereof can be targeted.
In addition, the container 1 may have various shapes other than a circular shape, a rectangular shape, and an elliptical shape. Furthermore, although the dome shape was illustrated as the lid | cover 3, a flat sheet-like form may be sufficient.

And in this invention, it does not exclude performing the anti-fogging process to the container main body 2. FIG. For example, the case where the container body 2 is the lid 3 and the lid 3 is the container body 2 is also included.
Thus, by providing the anti-fogging layer 33 on both the container body 2 and the lid 3, even the container 1 that can be turned upside down can obtain a good anti-fogging effect and improved sealing performance.

Further, the anti-fogging layer 33 provided on the lid 3 is not limited to being provided in the entire area of the dome portion 35 that is an inner peripheral region from the flange portion 36, and may be provided only in a part of the dome portion 35. Further, the configuration provided in only a part of the inner peripheral region from the flange 36 includes a case where the configuration is provided in a plurality of locations.
In the said embodiment, although the structure which is not provided in the collar part 36 was illustrated, providing in the area | region of the inner peripheral side rather than the heat seal part in the collar part 36 is not excluded.

  And although it demonstrated by removing the anti-fogging layer 33 in the collar part 36 after shape | molding in the lid | cover 3, you may remove the anti-fogging layer 33 in the step of a multilayer sheet. For example, as shown in FIG. 2, a notch 39 is provided at a predetermined position of the multilayer sheet before being formed into the lid 3. Then, the bonding layer 32 is agglomerated and peeled in a region corresponding to the heat-sealed portion or delaminated between the bonding layer 32 and the base material layer 31, and the antifogging layer 33 is removed together with the bonding layer 32. Thereafter, the lid 3 may be molded so that the region from which the antifogging layer 33 is removed becomes the region to be heat sealed.

In addition, the bonding between the container body 2 and the lid 3 is not limited to heat sealing, and various bonding methods such as welding by ultrasonic waves and bonding using an adhesive can be used.
Furthermore, as a structure which opens the container main body 2 and the lid | cover 3, it can also be set as any structure of the opening by delamination or the opening by cohesive peeling.
And the heat seal of the flange part 25 of the container main body 2 and the collar part 36 of the lid 3 is not limited to the case where the heat seal part is formed in an annular shape along the outer peripheral edge to provide the sealing performance, and the heat seal is performed in the outer peripheral direction. You may heat seal partially so that a part may be scattered. In this case, the bonding layer 32 may be removed in a scattered manner corresponding to the heat seal portion. In addition, even when heat-sealing so as to be scattered, the anti-fogging layer 33 may be removed in an annular shape including a portion to be heat-sealed. As a result, the antifogging layer 33 can be easily removed.
Moreover, although the joining layer 32 was removed in the whole area of the collar part 36, for example, the notch 39 is provided twice, and only the part to be heat-sealed between them is peeled in an annular shape, and the inner peripheral side and outer circumference of the heat seal part of the collar part 36 The antifogging layer 33 may be left on the side.

  And the weakened part for delamination of the anti-fogging layer 33 is not restricted to the notch 39 which cuts the joining layer 32 thinly so that cutting is possible. For example, a perforation such as a so-called perforation may be formed, or it may be formed of a member that is softer than other portions of the surface lower layer 22 and the release layer 21 and is easy to cut.

Moreover, although the two-layer structure of the base material layer 31 and the bonding layer 32 has been described as the transparent sheet 51 for forming the lid 3, the base material layer 31 may have a multilayer structure.
The container body may also have a structure of three or more layers.

Furthermore, not only the form of the container 1 constituted by the container body 2 and the lid 3, but also a form in which the joined portion is interposed between the container body 2 and the lid 3.
Moreover, it is good also as a form of not only the form of the container 1 but a bag. For example, the present invention can also be applied to a case in which a single antifogging sheet 5 is folded and overlapped, or two antifogging sheets 5 are overlapped and the overlapping peripheral edges are heat sealed to form a bag. In the case of this bag form, the mating antifogging sheet to be overlaid and sealed corresponds to the joined portion of the present invention, and the heat-sealed periphery corresponds to the flange of the present invention.

1 ... Container 2 ... Container body (molded body)
3 ... Lid (molded body)
5 ... Anti-fog sheet 25 ... Flange part (joined part)
31 ... base material layer 32 ... bonding layer 33 ... anti-fogging layer 36 ... flange (flange)
39 ... Notch (weakening part)

Claims (9)

A transparent anti-fogging sheet having a region where a bonded portion can be formed by bonding with a bonded portion,
A base material layer;
A laminated layer formed on the base material layer, and a bonding layer capable of delamination or cohesive peeling with the base material layer;
An antifogging layer comprising a resin composition formed by laminating on the bonding layer and containing an antifogging agent;
The anti-fogging sheet, wherein the bonding layer in the region is delaminated or coherently peeled to remove the antifogging layer. A transparent anti-fogging sheet having a region where a bonded portion can be formed by bonding with a bonded portion,
A base material layer;
A laminated layer formed on the base material layer, and a bonding layer capable of delamination or cohesive peeling with the base material layer;
An antifogging layer comprising a resin composition formed by laminating on the bonding layer and containing an antifogging agent;
The bonding layer and the anti-fogging layer are provided between the region and the other region, and are provided with weakened portions so as to cut the bonding layer and the anti-fogging layer, respectively. Anti-fog sheet. In the antifogging sheet according to claim 2,
The weakening portion is a notch formed by cutting in the thickness direction of the bonding layer and the antifogging layer. In the anti-fog sheet | seat of any one of Claim 1- Claim 3,
A transparent molded body provided with a flange having an area where a bonded portion is formed by bonding to a bonded portion, the portion where the bonding layer is delaminated or agglomerated and peeled is located in the region An anti-fogging sheet characterized by being used for molding the molded body. In the anti-fog sheet | seat of any one of Claim 1- Claim 4,
The antifogging sheet is characterized in that a portion where the bonding layer is delaminated or coherently peeled is annular. A base material layer, a laminate layer formed on the base material layer, delaminating or cohesive delamination between the base material layer, and a resin layered on the joint layer and containing an antifogging agent An antifogging sheet comprising an antifogging layer made of a composition is molded, and is a transparent molded body having a flange on the outer peripheral portion capable of forming a joint portion by joining with a joined portion,
The molded body, wherein the bonding layer is delaminated or coherently peeled together with the anti-fogging layer in at least the region of the joint portion of the flange. A transparent molded body in which the antifogging sheet according to any one of claims 1 to 5 is molded, and has a flange on an outer peripheral portion capable of forming a joint portion by joining with a joined portion. ,
The molded body, wherein the flange is molded in a state in which a portion where the bonding layer is delaminated or coherently peeled is located in a region corresponding to the bonding portion. The molded body according to claim 6 or 7, wherein the molded body is a lid having a flange portion that can be joined to the flange portion of the container body to form the joint portion. A container comprising the molded body according to any one of claims 6 to 8.

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