JP2022107429A - Top seal film and packaged article - Google Patents

Abstract

To provide top seal film that is excellent in product visibility and has a sufficient information display area and a packaged article with the top seal film, which is excellent in product visibility and having a sufficient amount of information.SOLUTION: The top seal film that top-seals by heat seal the opening of a container with an opening on the top includes: a top seal part that top-seals the opening by heat seal; and a ribbon part outside the top seal part. The packaged article includes: the top seal film; and the container with an opening on the top. The top seal film is top-sealed on the opening of the container, at the top seal part of the top seal film by heat seal.SELECTED DRAWING: Figure 7

Description

The present invention relates to a top seal film and a packaged product.

Conventionally, a packaging material that top-seals a container of food or the like by heat-sealing using a resin film has been known. Patent Document 1 includes a bottom surface portion and a side wall portion that is connected to the peripheral edge of the bottom surface portion and rises upward, and is open upward. A synthetic resin made of polyethylene terephthalate is provided on the surface of the upper end edge of the side wall portion. A paper container in which layers are laminated and a paper container body that has been fired and a sealant film that is bonded by heat sealing at least a part of the surface of the upper end edge of the side wall portion is provided. Described is a paper container having a predetermined initial sealing strength when a synthetic resin layer made of polyethylene terephthalate obtained by firing a film is heat-sealed against a laminated surface.

Further, Patent Document 2 describes a non-crystalline film having a heat-sealing property, a printed region in which a printed layer is formed on at least one surface of the non-crystalline film, and a non-printed region in which a printed layer is not formed. A heat seal film having the above is described.
However, with the conventional top-seal film, if the printing area is increased, the visibility of the contents of the packaging material deteriorates, so that a large amount of information cannot be displayed on the top-seal film, and a large amount of information is displayed. In order to do so, it is necessary to attach other articles such as labels, which causes problems such as labor, cost, and increased waste.

JP-A-2018-79945 Japanese Unexamined Patent Publication No. 2019-172276

The present invention has been made in view of such circumstances, and is a top seal film having excellent visibility of the product and having a sufficient information display area, and a product using the above top seal film. It is an object of the present invention to provide a packaged product having excellent visibility and a sufficient amount of information.

In order to achieve the above object, the present invention is configured as follows.

The top seal film of the present invention is a top seal film that top seals the opening of a container having an opening at the top by heat sealing, and has a top seal portion that top seals the opening by heat sealing, and the above. It is characterized by having a ribbon portion on the outside of the top seal portion.
The top seal film configured as described above has excellent product visibility and has a sufficient information display area. In addition, even when displaying a large amount of information, it is less necessary to attach other items such as labels, labor and cost can be reduced, and waste is reduced, which is environmentally friendly.

Further, the top seal film according to claim 2 has at least a heat-sensitive recording layer on the ribbon portion, and does not have the heat-sensitive recording layer at least on a portion of the top seal portion that is top-sealed by heat sealing.
In the top seal film configured as described above, even if the top seal film is top-sealed by heat sealing, the top-sealed portion does not develop color.

Further, the top seal film according to claim 3 has a heat-sensitive recording layer, and the color development temperature of the heat-sensitive recording layer is higher than the temperature at which the top seal is top-sealed by the heat seal.
In the top seal film configured as described above, the heat-sensitive recording layer does not develop color when top-sealing by heat-sealing.

Further, the top seal film according to claim 4 has a transparent base material.
The top seal film configured as described above has excellent product visibility.

Further, the top seal film according to claim 5 has the ribbon portion on both sides of the top seal portion.
The top seal film configured as described above is excellent in information display ability.

Further, the top seal film according to claim 6 has an adhesive layer on at least a part of one surface of the ribbon portion.
With the top seal film configured as described above, the ribbon portion can be easily joined to the container.

Further, in the roll paper of the present invention, the top seal film according to any one of claims 1 to 6 is continuously formed.
According to the roll paper configured as described above, it is possible to provide a top seal film having excellent product visibility and a sufficient information display area. Further, even when displaying a large amount of information, it is less necessary to attach other articles such as labels, labor and cost can be reduced, waste is reduced, and an environment-friendly top seal film can be provided.

Further, the packaged product of the present invention includes the top seal film according to any one of claims 1 to 6 and a container having an opening at the top, and the top seal film is an opening of the container. The top seal portion of the top seal film is top-sealed by heat sealing.
The packaged product configured as described above has excellent visibility of the product and can display a sufficient amount of information. Moreover, even when a large amount of information is displayed, it is less necessary to attach other items such as labels, labor and cost can be reduced, and waste is reduced, which is environmentally friendly.

Further, in the packaged product according to claim 9, the ribbon portion is joined to the container.
The packaged products configured as described above are compact and easy to handle.

Further, the packaged product according to claim 10 includes the top seal film according to claim 5 and a container having an opening at the top, and the top seal film has the top at the opening of the container. It is a packaged product that is top-sealed by heat-sealing in the top-seal portion of the seal film, and the ribbon portions on both sides of the top-seal portion are joined so as to wrap the container.
The packaged product configured as described above has excellent visibility of the product and can display a sufficient amount of information. Moreover, even when a large amount of information is displayed, it is less necessary to attach other items such as labels, labor and cost can be reduced, and waste is reduced, which is environmentally friendly. Furthermore, it is compact and easy to handle.

According to the present invention, a top seal film having excellent product visibility and a sufficient information display area, and using the top seal film, product visibility is excellent and a sufficient amount of information is provided. It is possible to provide a packaged product to have.

It is a schematic diagram of Embodiment 1 of the top seal film which concerns on this invention. It is a schematic diagram of Embodiment 2 of the top seal film which concerns on this invention. It is a figure which shows typically the cross section of the top seal film of Embodiment 2. It is a figure which shows typically the roll paper in which the top seal film of Embodiment 2 was formed continuously. It is a figure which shows typically the cross section of Embodiment 3 of the top seal film which concerns on this invention. It is a schematic diagram of Embodiment 4 of the top seal film which concerns on this invention. It is a perspective view of Embodiment 1 of the packaged article which concerns on this invention. It is a perspective view of Embodiment 2 of the packaged article which concerns on this invention. It is a perspective view of Embodiment 3 of the packaged article which concerns on this invention. It is a schematic diagram of the cross section of Embodiment 4 of the packaged article which concerns on this invention. It is a schematic diagram of the cross section of Embodiment 5 of the packaged article which concerns on this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1. 1. Top seal film The top seal film of the present invention is a top seal film that top seals the opening of a container having an opening by heat sealing, and the top seal portion that top seals the opening by heat sealing and the above. It has a ribbon portion on the outside of the top seal portion.

Embodiment 1
FIG. 1 schematically shows the top seal film 10 of the first embodiment of the top seal film according to the present invention. 1 is a base material, and 2 is a top-sealing portion, which is a region for top-sealing the opening of a container having an opening by heat-sealing. The film in the range indicated by 3 is the ribbon portion (hereinafter, referred to as the ribbon portion 3). In the top seal film 10, the portion of the top seal portion 2 can reduce the display of information by printing, printing, etc. to improve the visibility of the product, and the ribbon portion 3 can display information such as the product description. 301 represents the length of the ribbon portion, and 302 represents the width of the ribbon portion.

Embodiment 2
2 and 3 schematically show the top seal film 4 of the second embodiment of the top seal film according to the present invention. The top seal film 4 is an embodiment in which an adhesive layer and a release layer are provided on the ribbon portion of the top seal film 10.

In the top seal film 4, 5 is a base material and 6 is a top seal portion. The top seal portion 6 is a region where the opening of the container having the opening is top-sealed by heat sealing. The film in the range indicated by 7 is the ribbon portion (hereinafter, referred to as the ribbon portion 7). An adhesive layer 8 is provided on one surface of the base material 5 at an end portion away from the top seal portion 6 in the length direction of the ribbon portion 7 (the length direction of the ribbon portion 7 is the same as in FIG. 1). Then, the release layer 9 is provided on the surface of the base material 5 opposite to the surface having the adhesive layer 8 at a portion facing the adhesive layer 8 with the film interposed therebetween. The adhesive layer 8 and the release layer 9 are continuously formed in a strip shape in the width direction of the ribbon portion 7 (the width direction of the ribbon portion 7 is the same as in FIG. 1). In the top seal film 4, the ribbon portion 7 can be easily joined to the container by the adhesive layer 8.
The release layer 9 may be formed in a size that covers all of the adhesive layer 8 and may have the same width as the adhesive layer 8. The adhesive layer 8 and the release layer 9 are not limited to the end portion separated from the top seal portion 6 in the length direction of the ribbon portion 7, and may be provided at any position, and at least in the width direction of the ribbon portion 7. It may be partially formed.

The top seal film 4 can be supplied, for example, in the form of a roll paper 21 on which the top seal film 4 is continuously formed as shown in FIG. In FIG. 4, the same reference numerals as those in FIGS. 2 and 3 represent the same ones.
The roll paper 21 is supplied as a wound body. The hollow arrow in FIG. 4 is the traveling direction of the line. In this case, the adhesive layer 8 of the ribbon portion 7 is in contact with the release layer 9. In the roll paper 21, the top seal film 4 is obtained by cutting along the cutting line 23.

Embodiment 3
FIG. 5 schematically shows a cross section of the top seal film 14 of the third embodiment of the top seal film according to the present invention. Reference numeral 15 is a base material, and 16 is a top-sealing portion, which is a region for top-sealing the opening of the container having the opening by heat-sealing. The film in the range indicated by 17 is the ribbon portion (hereinafter, referred to as the ribbon portion 17). An adhesive layer 18 is provided on one surface of the base material 15 at an end portion away from the top seal portion 16 in the length direction of the ribbon portion 17 (the length direction of the ribbon portion 17 is the same as in FIG. 1). Then, it has a peeling material 19 which is bonded to the adhesive layer 18 in a peelable state. The portion of one surface of the base material 15 that does not have the adhesive layer 18 is in contact with the release material 19. Similar to the top seal film 4, the adhesive layer 18 and the release material 19 are formed in a continuous strip shape in the width direction of the ribbon portion 17 (the width direction of the ribbon portion 17 is the same as in FIG. 1). In the top seal film 14, the ribbon portion 17 can be easily joined to the container.
The adhesive layer 18 is not limited to the end portion away from the top seal portion 16 in the length direction of the ribbon portion 17, but may be provided at any position, and is formed at least in a part of the ribbon portion 17 in the width direction. It may have been done.

The top seal film 14 can be supplied, for example, in the form of roll paper on which the top seal film 14 is continuously formed. When used in a container, the release material 19 is wound on a take-up roll.

Embodiment 4
FIG. 6 schematically shows the top seal film 100 of the fourth embodiment of the top seal film according to the present invention. Reference numeral 11 is a base material, and 12 is a top seal portion. The top seal portion 12 is a region where the opening of the container having the opening is top-sealed by heat sealing. The film in the range indicated by 13 is the ribbon portion (hereinafter, referred to as the ribbon portion 13). Since the top seal film 100 has two ribbon portions 13 on both sides of the top seal portion 12, more information such as a product description can be displayed on the ribbon portion 13.
The ribbon portion 13 may have an adhesive layer and a release layer in the same manner as the ribbon portion 7 (FIGS. 2 to 4) and the ribbon portion 17 (FIG. 5).

In the top seal film of the present invention, the opening of the container having the opening is top-sealed at the top seal portion by heat sealing. As for the heat sealability of the top seal film, for example, when two top seal films are heat-sealed at a temperature of 160 ° C., a seal bar pressure of 2 MPa, and a seal time of 2 seconds, the heat seal strength is 0.5 N / 15 mm or more. It is preferable to have. By having such heat-sealing strength, the top-seal film can more preferably top-seal the opening of the container having the opening by heat-sealing. The heat seal strength is more preferably 1.0 N / 15 mm or more, further preferably 2.0 N / 15 mm or more, still more preferably 2.5 N / 15 mm or more, and particularly preferably 3.0 N / 15 mm or more. It is 15 mm or more. The heat seal strength is preferably high, but practically, it is preferably 2.5 N / 15 mm or less.

The thickness of the top seal film is, for example, preferably 10 μm to 200 μm, more preferably 15 μm to 100 μm, and even more preferably 20 μm to 70 μm.

1-1 Base material The top seal film of the present invention preferably has a base material. The base material may be any material having a heat-sealing property, and examples thereof include an amorphous film having a heat-sealing property. The base material is preferably transparent. By doing so, the visibility inside the packaging container can be further enhanced.

The thickness of the base material is preferably, for example, 10 μm to 200 μm, more preferably 15 μm to 100 μm, and even more preferably 20 μm to 70 μm.

The non-crystalline film can be made of any suitable resin and typically contains an amorphous component. The amount of the amorphous component in the resin constituting the non-crystalline film is preferably 12 mol% or more, more preferably 13 mol% or more, and further preferably 14 mol% or more. The upper limit of the amount of the amorphous component is preferably 30 mol%, more preferably 29 mol%, and further preferably 28 mol%. As a result, the amorphous film can be imparted with heat-sealing properties.

Examples of the resin used for the amorphous film having heat-sealing property include polyester-based resins and the like. The polyester resin contains an ethylene terephthalate unit as a main component and one or more monomer components that can be an amorphous component. Examples of the monomer of the carboxylic acid component that can be an amorphous component include isophthalic acid, 1,4-cyclohexanedicarboxylic acid, and 2,6-naphthalenedicarboxylic acid. Examples of the monomer of the diol component that can be an amorphous component include neopentyl glycol, 1,4-cyclohexanedimethanol, 2,2-diethyl-1,3-propanediol, and 2-n-butyl-2-ethyl-1. , 3-Propanediol, 2,2-isopropyl-1,3-propanediol, 2,2-di-n-butyl-1,3-propanediol, and hexanediol. Of these, isophthalic acid, neopentyl glycol, and 1,4-cyclohexanedimethanol are preferable. Further, other dicarboxylic acid components and / or diol components constituting the polyester resin may be contained. Examples of the other dicarboxylic acid components include aromatic dicarboxylic acids such as orthophthalic acid, aliphatic dicarboxylic acids such as adipic acid, adipic acid, sebacic acid, and decandicarboxylic acid, and alicyclic dicarboxylic acids. Examples of the diol component include long-chain diols such as diethylene glycol and 1,4-butanediol, aliphatic diols such as hexanediol, and aromatic diols such as bisphenol A.

The base material may contain various additives in addition to the above resin. Examples of the additive include waxes, antioxidants, antistatic agents, crystal nucleating agents, thickeners, heat stabilizers, coloring pigments, coloring inhibitors, ultraviolet absorbers and the like. Further, fine particles may be added as a lubricant for improving the slipperiness of the film. Examples of the fine particles include inorganic fine particles such as silica, alumina, titanium dioxide, calcium carbonate, kaolin, and barium sulfate, and organic fine particles such as acrylic resin particles, melamine resin particles, silicone resin particles, and crosslinked polystyrene particles. Can be mentioned.

The above-mentioned base material is melt-extruded by an extruder to form an unstretched film, and is stretched under arbitrary appropriate stretching conditions (stretching temperature, stretching ratio, stretching direction), if necessary. Can be manufactured. The film may be unstretched, but a film obtained by biaxial stretching is preferable from the viewpoint of film strength and productivity. A non-crystalline film composed of a polyester resin can be produced by polycondensing by selecting the type and amount of a dicarboxylic acid component and a diol component so as to contain an appropriate amount of a monomer that can be an amorphous component.

1-2 Top-seal portion The top-seal portion is provided as a region in the top-seal film for top-sealing the opening of a container having an opening at the top by heat-sealing. The top seal portion is a square or rectangular region having two sides in the longitudinal direction of the top seal film, the length and width of which is preferably the minimum length and width corresponding to the opening of the heat-sealed container. Can be specified. The heat seal is performed in the top seal portion, and the shape and size of the portion to be top sealed by the heat seal in the top seal portion depends on the shape of the opening of the container.

1-3 Ribbon portion The ribbon portion is provided on the outside of the top seal portion in the top seal film. That is, in the top seal film of the present invention, the portion wider than the opening of the container to be top sealed is the ribbon portion. The outside of the top seal portion may be one side of the top seal portion or both sides of the top seal portion, and may be outside of the top seal portion in any three or four directions of up, down, left, and right. There may be. By having the ribbon portion, a large amount of information such as a product description can be displayed without using other labels or the like, and the amount of information displayed in the top seal portion can be suppressed to improve the visibility of the product.

The length of the ribbon portion is, for example, the length indicated by reference numeral 301 in FIG. 1, and is measured in the direction away from the top seal portion at the shortest distance. The length of the ribbon portion is preferably about 2 cm or more, more preferably about 3.5 cm or more, further preferably about 5 cm or more, particularly preferably about 6.5 cm or more, and is about the height of the container to be top-sealed. Alternatively, as described later, both ends of the ribbon portion may be longer than the length that can be joined by heat sealing on the bottom surface or the side surface of the container. When the ribbon portions are on both sides of the top seal portion, the lengths of the ribbon portions on both sides may be the same or different.

The width of the ribbon portion is, for example, the width indicated by reference numeral 302 in FIG. 1, and is measured in a direction parallel to the boundary line with the top seal portion. The width of the ribbon portion may be the same as the width of the top seal film of the portion having the top seal portion, may be wider than the above width by, for example, about 0.5 to 1.5 cm, or may be narrower than the above width. Is also good. The length and width of the ribbon portion can be appropriately selected depending on the amount of information to be displayed and the design of the packaged product top-sealed by the top-sealing film.
The ribbon portion may be rectangular, but may have other shapes such as a semicircle, a triangle, and a trapezoid. When the ribbon portions are on both sides of the top seal portion, the shapes of the ribbon portions on both sides may be the same or different.

1-4 Heat-sensitive recording layer The top seal film may have a heat-sensitive recording layer laminated on the base material. The thermal recording layer is preferably transparent. By doing so, the visibility inside the packaging container can be further enhanced.

The heat-sensitive recording layer is preferably provided so that the heat-sensitive recording layer does not develop color when the top seal film is heat-sealed.
As such a form, it is preferable that the ribbon portion or the like has a heat-sensitive recording layer, and at least the portion to be top-sealed by the heat seal of the top-sealing portion does not have the heat-sensitive recording layer. be.
Further, it is also one of the preferable forms that the color development temperature of the heat-sensitive recording layer is higher than the temperature of the heat seal. In this case, the heat-sensitive recording layer may be provided on the entire surface of the top seal film. The color development temperature of the heat-sensitive recording layer is preferably 10 ° C. or higher higher than the temperature of the heat seal.

The thermal recording layer contains a coloring material that develops color by heating. The color-developing material is not particularly limited as long as it can be colored by heating, and a dye that can be colored independently may be used, and a transparent or light-colored dye (leuco dye) and this dye are colored by heating. It may be used in combination with a color developer capable of producing. Color-developing materials that combine leuco dyes and color-developing agents are also used in general thermal recording paper, etc., and are easily available and highly versatile.

Known leuco dyes can be used, for example, triphenylmethanephthalide type, triallylmethane type, fluorane type, phenothidian type, thiofluorane type, xanthene type, indophthalyl type, spiropirane type, azaphthalide type, chromenopyrazole. Various leuco dyes such as rhodamine-based, methine-based, rhodamine anilinolactum-based, rhodamine lactam-based, quinazoline-based, diazaxanthene-based, and bislactone-based. One type of leuco dye may be used alone, but by using two or more types in combination, it is possible to print a desired color.

As the color developer, an electron acceptor such as an acidic substance can be used. The color developer can be appropriately selected according to the type of leuco dye, and known ones can be used. Examples of the color developer include organic acids such as benzoic acid, metal salt compounds of organic acids such as zinc salicylate, phenolic compounds such as p-octylphenol, and 4-4'thiobis (6-t-butyl-2-methyl). Examples thereof include thiophenolic compounds such as phenol), thiourea derivatives such as NN'-diphenylthiourea, and diphenylsulfone compounds such as 3,3'-diallyl-4,4'-dihydroxydiphenylsulfone. These color developeres can be used alone or in combination of two or more.

In addition, the thermal recording layer may optionally contain other materials such as fillers, binders, and lubricants. Details of the materials that can be contained in the thermal recording layer are described, for example, in International Publication No. 2015/07241. The entire description of the pamphlet is incorporated herein by reference.

Examples of the above-mentioned filler include kaolin and calcium carbonate, and the particle size thereof is preferably 1.0 μm or less.

Examples of the binder include a styrene-butadiene copolymer and the like.

Examples of the lubricant include polyethylene, zinc stearate, paraffin, and the like, and the particle size thereof is preferably 0.5 μm or less.

In order to improve the transparency, it is particularly effective to contain paraffin, which has a low melting point of less than the color development temperature of the heat-sensitive recording layer, preferably less than 80 ° C, more preferably less than 50 ° C. Is preferable.

The particle size of this low melting point paraffin is preferably 0.5 μm or less. The content of this paraffin is preferably 0.1 to 1.0 g / m ² in terms of dry weight, for example.

By containing paraffin having a low melting point in this way, when the coating liquid for forming a heat-sensitive layer is applied onto the substrate and dried, the paraffin melts and the surface irregularities of the particles constituting the heat-sensitive recording layer are formed. It enters into the gaps such as paraffin and fills the gaps, whereby diffuse reflection on the particle surface can be suppressed and the transparency can be further improved.

In the top seal film of the present invention, it is preferable that the ribbon portion has a heat-sensitive recording layer, and the area of the heat-sensitive recording layer in the top seal portion is small. Specifically, the area of the heat-sensitive recording layer in the top seal portion is preferably 60% or less, preferably 40% or less, of the area surrounded by the portion to be top-sealed by the heat seal in the top seal portion. Is more preferable, 20% or less is further preferable, and 0% (that is, no heat-sensitive recording layer is provided) is particularly preferable. By doing so, the visibility inside the top-sealed container can be further improved.

1-5 Adhesive layer The top seal film preferably has an adhesive layer on at least a part of one surface of the ribbon portion. The adhesive layer may be provided on the entire surface of one surface of the ribbon portion. The adhesive layer is preferably formed continuously in the width direction of the ribbon portion (see FIG. 1). The adhesive layer may be formed in at least a part of the ribbon portion in the width direction. As the adhesive layer, a conventionally known adhesive such as an adhesive can be used.

1-6 Release layer or release material When the top seal film has the adhesive layer, it is preferable to further have a release layer or release material. The peeling layer is a layer that is bonded to the adhesive layer in a peelable state, and is preferably provided on a surface of the top seal film opposite to the surface having the adhesive layer. As the release layer, a conventionally known material can be used, and examples thereof include silicon and the like.
Further, the release material is a member that is bonded to the adhesive layer in a removable state. As the release material, a conventionally known release material can be used, and examples thereof include paper having at least one surface peeled.

1-7 Print Layer The top seal film may have a print layer laminated on the base material. The print layer is typically formed by printing a material constituting the print layer on the surface of a base material. Examples of the above-mentioned material include a coating liquid containing a dye, a pigment, a metal, a binder component material, a solvent, and other components. Further, the material may contain a metal, and a printed layer may be formed by depositing the metal on the surface of the base material. The type of metal is not particularly limited, and for example, aluminum, aluminum alloy, copper, copper alloy (copper-nickel alloy, copper-zinc alloy, etc.), silver, silver alloy and the like can be used. The form of the metal may be any form such as metal powder, metal flakes, and metal fibers. The printing layer containing these metals is excellent not only in designability but also in light-shielding property.

As a method of printing the above material on the surface of the base material, any appropriate method can be adopted depending on the application of the top seal film and the compatibility with the base material. For example, gravure printing, offset printing, convex rotation. Examples include printing, UV printing, silk screen printing and the like.

It is preferable that the print layer is mainly provided on the ribbon portion and the area of the print layer in the top seal portion is small. Specifically, the area of the print layer in the top seal portion is preferably 60% or less, and preferably 40% or less of the area of the portion surrounded by the portion to be top-sealed by the heat seal in the top seal portion. It is more preferably 20% or less, and particularly preferably 0% (that is, no printing layer is provided). By doing so, the visibility inside the top-sealed container can be further improved.

1-8 Other Layers The top seal film of the present invention may have other layers other than the above. Examples of the other layer include a protective layer provided on the heat-sensitive recording layer, an intermediate layer provided between the heat-sensitive recording layer and the protective layer, and the like. The intermediate layer preferably has a barrier property against water and oil.

As the protective layer, a binder to which a filler, a lubricant, a cross-linking agent, or the like is added is used.

Examples of the resin as the binder include acrylic resin and the like.

Examples of the lubricant include polyethylene and zinc stearate.

Examples of the cross-linking agent include zirconium carbonate and the like.

Examples of the filler include colloidal silica, calcium carbonate, polymethylmethacrylate (PMMA), polystyrene (PS) and the like.

The particle size of these fillers is preferably 1.0 μm or less.

In order to further improve the transparency, colloidal silica having a small particle size is preferable as the filler.

The intermediate layer is mainly formed of a resin. Examples of the resin of the intermediate layer include an acrylic resin emulsion, a water-soluble resin such as polyvinyl alcohol (PVA) resin, and an SBR resin.

In order to improve the transparency, the resin may be a resin having a water-soluble moiety, for example, a polyvinyl alcohol (PVA) resin which is a resin having a hydroxy group as a hydrophilic structural unit, or hydrophobic core particles. A resin having a core-shell structure coated with a water-soluble shell polymer, for example, a core-shell type acrylic resin is preferable.

Water-soluble polyvinyl alcohol (PVA) and core-shell type acrylic resin have good film-forming properties, and are water-soluble when a coating liquid for forming an intermediate layer is applied onto a heat-sensitive recording layer and dried. Since the resin having the portion soaks into the heat-sensitive recording layer to form a smooth intermediate layer, diffused reflection in the heat-sensitive recording layer is suppressed and the transparency is further improved.

The core-shell type resin is conventionally known, and examples thereof include a core-shell type acrylic resin commercially available under the name of Barrier Star (manufactured by Mitsui Chemicals, Inc.).

According to the top seal film of the present invention, it is possible to provide a packaged product having excellent visibility of a product and having a sufficient amount of information.

2. Packaged product The packaged product of the present invention includes the top seal film and a container having an opening, and the top seal film is top-sealed at the opening of the container by heat sealing at the top seal portion. ..

Hereinafter, specific embodiments will be shown and described in detail.

Embodiment 1
FIG. 7 schematically shows the packaged product 200 of the first embodiment of the packaged product according to the present invention. The packaged product 200 includes a container 24 having an opening at the top and a top seal film 10 (see FIG. 1). In the packaged product 200, the container 24 is packaged by the top seal film 10. Then, the opening of the container 24 is top-sealed at a portion 22 in the top-seal portion 2 (see FIG. 1) of the top-seal film 10 which is top-sealed by heat-sealing.

In the packaged product 200, the ribbon portion 3 hangs down from the side surface of the container 24, and product information or the like can be mainly displayed on this portion by printing or printing. Therefore, the packaged product 200 has excellent visibility of the product and can display a sufficient amount of information.

The ribbon portion 3 hanging from the side surface may be joined to the side surface of the container 24 at least in part. Since the ribbon portion 3 hanging from the side surface is joined at least a part of the side surface of the container 24, the packaged product 200 can be handled more easily. Examples of the joining method include sticking with hot melt glue and percoat glue, ultrasonic sealing, double-sided tape, heat sealing and the like.

Embodiment 2
FIG. 8 schematically shows the packaged product 500 of the second embodiment of the packaged product according to the present invention. The packaged product 500 includes a container 124 having an opening at the top and a top seal film 50. In the packaged product 500, the container 124 is packaged by the top seal film 50. Like the top seal film 10 (see FIGS. 1 and 7), the top seal film 50 has a base material (not shown), a top seal portion 51, and a ribbon portion 53, and is further adhered to the ribbon portion 53. It has a layer 28.

In the packaged product 500, the opening of the container 124 is top-sealed at a portion 52 of the top-sealing portion 51 of the top-sealing film 50, which is top-sealed by heat-sealing. The ribbon portion 53 of the top seal film 50 hangs down from the side surface of the container 124, and product information or the like can be mainly displayed on this portion by printing or printing. Therefore, in the packaged product 500, as in the packaged product 200, the visibility of the product is excellent and a sufficient amount of information can be displayed.

In the packaged product 500, the ribbon portion 53 is joined to the side surface of the container 124 by the adhesive layer 28. In the packaged product 500, since the ribbon portion 53 has the adhesive layer 28, it is easier to join the ribbon portion 53 to the container 124. Further, since the ribbon portion 53 hanging from the side surface is joined to the side surface of the container 124, the packaged product 500 can be handled more easily.

Embodiment 3
FIG. 9 schematically shows the packaged product 600 according to the third embodiment of the packaged product according to the present invention. In the packaged product 600, the container 224 is packaged by the top seal film 14 (top seal film of the third embodiment, see FIG. 5). In FIG. 9, the same reference numerals as those in FIG. 5 represent the same ones. Then, the opening of the container 224 is top-sealed at a portion 62 of the top-seal portion 16 of the top-seal film 14 which is top-sealed by heat-sealing.

In the packaged product 600, the ribbon portion 17 hangs down from the side surface of the container 224, and product information or the like can be printed or printed on this portion. Therefore, in the packaged product 600, the visibility of the product is excellent and a sufficient amount of information can be displayed.

The ribbon portion 17 hanging from the side surface has an adhesive layer 18 over the entire width of the ribbon portion 17 on the surface on the side in contact with the container 224 (see FIG. 2). Then, the ribbon portion 17 is joined to the side surface of the container 224 by the adhesive layer 18. In the packaged product 600, since the ribbon portion 17 has the adhesive layer 18, it is easier to join the ribbon portion 17 to the container 224. Further, since the ribbon portion 17 hanging from the side surface can be joined to the side surface of the container 224 over the entire width thereof, the packaged product 600 can be handled more easily.

Embodiment 4
FIG. 10 schematically shows a cross section of the packaged product 300 according to the fourth embodiment of the packaged product according to the present invention. The packaged product 300 includes a container 34 having an opening at the top and a top seal film 30. The top seal film 30 has a top seal portion 31 like the top seal film 100 (see FIG. 6), and has two ribbon portions 33 on both sides of the top seal portion 31. Then, the opening of the container 34 is top-sealed at the portion 32 that is top-sealed by the heat seal in the top-sealing portion 31. Each of the ribbon portions 33 hangs down on the side surface of the container 34, and product information or the like can be displayed on this portion by printing, printing, or the like. Therefore, the packaged product 300 has excellent visibility of the product and can display a sufficient amount of information.

In the packaged product 300, the two ribbon portions 33 are joined by laminating at the joint portion 35 at the bottom so as to wrap the container 34. The joining portion 35 is not limited to the bottom portion, and may be joined at an appropriate portion. The joint portion of the two ribbon portions 33 may be, but is not limited to, the end portion of the ribbon portion. By joining the two ribbon portions 33, the packaged product 300 can be handled more easily. Examples of the joining method include sticking with hot melt glue and percoat glue, ultrasonic sealing, double-sided tape and the like. Further, the ribbon portion 33 may be provided with an adhesive layer in advance, and the ribbon portions 33 may be joined to each other by the adhesive layer.

Embodiment 5
FIG. 11 schematically shows a cross section of the packaged product 400 according to the fifth embodiment of the packaged product according to the present invention. The packaged product 400 includes a container 44 having an opening at the top and a top seal film 40. The top seal film 40 has a top seal portion 41 like the top seal film 100 (see FIG. 6), and has two ribbon portions 43 on both sides of the top seal portion 41. Then, the opening of the container 44 is top-sealed at the portion 42 that is top-sealed by the heat seal in the top-seal portion 41. Each of the above two ribbon portions 43 hangs down on the side surface of the container 44, and product information or the like can be displayed on this portion by printing, printing, or the like. Therefore, the packaged product 400 has excellent visibility of the product and can display a sufficient amount of information.

In the packaged product 400, the two ribbon portions 43 are joined by a gassho sticking at the joint portion 45 at the bottom so as to wrap the container 44. The joining portion 45 is not limited to the bottom portion, and may be joined at an appropriate portion. The joint portion of the two ribbon portions 43 may be, but is not limited to, the end portion of the ribbon portion. By joining the two ribbon portions 43, the packaged product 400 can be handled more easily. Examples of the joining method include sticking with hot melt glue and percoat glue, ultrasonic sealing, double-sided tape and the like. Further, an adhesive layer may be provided in advance at an appropriate position on the ribbon portion 43, and the ribbon portions 43 may be joined to each other by the adhesive layer.
The joining form of the two ribbon portions is not limited to the gassho pasting and the overlapping pasting, and can be appropriately selected.

The top seal film contained in the packaged product of the present invention is the above-mentioned top seal film of the present invention, and the preferred embodiment thereof is the same as that described in the above section of the top seal film.

According to the packaged product of the present invention, it is possible to provide a packaged product having excellent visibility of the product and having a sufficient amount of information.

10, 4, 14, 30, 40, 50, 100: Top seal film 1, 5, 11, 15: Base material 2, 6, 12, 16, 31, 41, 51: Top seal portion 22, 32, 42, 52, 62: Places top-sealed by heat sealing 3, 7, 13, 17, 33, 43, 53: Ribbon part 301: Length of ribbon part 302: Width of ribbon part 35, 45: Joining of ribbon parts Locations 8, 18, 28: Adhesive layer 9: Release layer 19: Release material 21: Roll paper on which a top seal film is continuously formed 23: Cut lines 24, 34, 44, 124, 224: Containers 200, 300, 400, 500, 600: Packaged product

Claims (10)

A top-seal film that top-seals the opening of a container having an opening at the top by heat-sealing.
A top seal portion that top seals the opening by heat sealing, and a top seal portion.
A top seal film having a ribbon portion on the outside of the top seal portion. At least the ribbon portion has a heat-sensitive recording layer,
The top-seal film according to claim 1, which does not have the heat-sensitive recording layer at least in a portion of the top-seal portion to be top-sealed by heat-sealing. Has a thermal recording layer,
The top seal film according to claim 1, wherein the color development temperature of the heat sensitive recording layer is higher than the temperature at which the top seal is performed by the heat seal. The top seal film according to any one of claims 1 to 3, which has a transparent base material. The top seal film according to any one of claims 1 to 4, which has the ribbon portion on both sides of the top seal portion. The top seal film according to any one of claims 1 to 5, which has an adhesive layer on at least a part of one surface of the ribbon portion. A roll paper on which the top seal film according to any one of claims 1 to 6 is continuously formed. The top seal film according to any one of claims 1 to 6 and a container having an opening at the top thereof are included.
A packaged product in which the top seal film is top-sealed at the opening of the container by heat sealing at the top seal portion of the top seal film. The packaged product according to claim 8, wherein the ribbon portion is joined to the container. The top seal film according to claim 5 and a container having an opening at the top are included.
The top seal film is a packaged product in which the opening of the container is top-sealed by heat sealing at the top seal portion of the top seal film.
A packaged product in which ribbon portions on both sides of the top seal portion are joined so as to wrap the container.

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