JP4631358B2 - Cover material with open state retention function - Google Patents

Description

  The present invention relates to a lid for a molded container used for sealed packaging of instant foods such as cup noodles, and more specifically, in the case of eating instant foods such as cup noodles, In order to facilitate the operation of pouring hot water, the present invention relates to a lid material with an opened state holding function having a function of holding the opened lid material in an opened state as it is.

  Conventionally, in the food packaging field, as a molded container for storing instant foods such as cup noodles that are made ready to eat by adding hot water, it is a cup-shaped or bowl-shaped shape made of polyethylene resin (PE) on paper. Molded containers made of laminated materials laminated with, polystyrene resin (PS) molded containers, polypropylene resin (PP) molded containers, molded containers made of laminated materials laminated with polystyrene resin (PS) sheets and polyethylene terephthalate resin (PET) sheets, etc. in use.

  On the other hand, the container lid used for instant packaging of instant foods such as cup noodles is a laminated body in which aluminum foil is laminated mainly with a paper base material. A packaging method is adopted in which the container is housed, the opening of the container is covered with the lid, and the flange of the container is sealed by a heat seal method or the like.

  By the way, although various things are developed and proposed as a lid | cover material, the laminated material which usually comprises a lid | cover material has many laminated materials containing aluminum foil. For example, a conventional lid material is provided with a pattern printing ink layer on the upper surface of a base material mainly composed of a paper layer, and a thermoplastic resin layer, an aluminum foil layer, and an easy peel sealant layer are sequentially laminated on the lower surface of the base material. It is formed of a laminated material.

  The paper layer uses bleached kraft paper, pure white roll paper, fine paper, art paper, coated paper, etc., produced from pulp in which cellulose is extracted by chemically or mechanically treating plant materials such as wood. ing. As the thermoplastic resin layer, a low density polyethylene resin (LDPE) is mainly used. After the low density polyethylene resin (LDPE) is melted by heat, the thermoplastic resin layer is extruded by an extruder (extruder), and is based on a paper layer. It serves as an adhesive for laminating the material and the aluminum foil layer as the barrier layer. As the aluminum foil layer, an aluminum foil having a thickness of 7 μm or more is used. However, the aluminum foil layer is excellent in moisture proofing, gas barrier properties, incense retention, and light shielding properties, and also has good dead hold properties (molding retention properties). in use.

  As described above, since the conventional lid material is mainly made of a laminated material containing aluminum foil, it has excellent physical properties such as gas barrier properties and has a dead hold property after opening. It has a function to keep it open. Generally, a consumer is in a cup-shaped or bowl-shaped molded container, for example, when eating instant noodles, first peel off a part of the lid from the container, and from the opening once After taking out the bag containing the liquid soup and the ingredients, only the contents are returned to the container again, hot water is poured, and the opened lid is resealed in the opening of the container. When performing the operation of pouring hot water in this way, if the lid has a function to keep the opened state, the operation of pouring hot water into the instant food in the container becomes easy, so sealed packaging of instant food such as cup noodles It is suitable for the lid material of the container used for the above.

The lid material made from a laminated material containing aluminum foil in this way has excellent physical properties such as gas barrier properties, and has a dead hold property after opening, so it is necessary to hold the opened lid material as it is in the opened state. It is the most suitable cover material for applications that require high power. However, in recent years, various problems have been pointed out regarding lids made of a laminate in which aluminum foils are laminated. For example, when incineration processing is performed in disposal after use, problems associated with so-called disposal have occurred, such as problems that the aluminum foil remains as a residue and problems that may damage the incinerator. . In addition, it is requested from the request for resource reuse that the lid material is collected after use, separated by material, and reused. However, in the laminated material using the aluminum foil as described above, the paper base material, aluminum It is extremely difficult to separate and collect materials such as foil and resin film, and it is practically impossible to reuse them. Furthermore, it is impossible to use a metal detector for confirming the contamination of foreign substances such as metals, which is performed from the viewpoint of hygiene and safety after food packaging, and the hygiene and safety aspects are not good.

  Therefore, in order to solve these problems, a lid member made of a laminate in which various plastic films are combined mainly with paper has been studied. That is, it is the development of a laminate that has excellent physical properties such as gas barrier properties and has dead hold property after opening even without an aluminum foil. Physical properties such as gas barrier properties are superior to aluminum foil if a laminate obtained by depositing an inorganic oxide or the like on a plastic film is used, but it is basically rigid and has a dead hold property after opening. There is no plastic film excellent in dead hold property, and there is little possibility of obtaining a cover material that substitutes for aluminum foil on the material surface, so the following method is used as a function to maintain the open state of the cover material Lid materials with improved lids and structural surfaces have been developed. For example, it is a method in which an adhesive is applied to the lid in advance and the open state of the lid is maintained. In this method, the problem of handling the adhesive, the contents of the adhesive, and the inner surface of the container Problem of migration.

  Next, a lid material having a structure in which the opening pull tab portion of the lid material is cut and hooked to the end of the flange portion of the container body has been proposed. However, in this case, repulsion due to the rigidity of the laminate made of paper and plastic film is large, and it is not easy to catch. In addition, since the cut in the opening pull tab portion of the lid material is a full penetration process from the outermost layer to the innermost layer, if the position of the cut processed in the lid material is machined inside the flange of the container body, sealing performance Will be damaged, causing a problem in the storage stability of the contents.

  Next, using a laminate in which a surface base material mainly made of paper and a plastic film are laminated, and further providing a release agent layer between the surface base material and the plastic film, a lid material having an opening function by delamination In the case of a product that has a conventional lid material with a mechanism that forms an opening for pouring hot water by completely removing the peeled surface base material, but it is necessary to steam the contents of noodles In this case, it is necessary to reseal the lid to the container body, so that the lid cannot be completely removed, and the peeled surface base material is warped so that it does not interfere with the operation of pouring hot water. It is necessary to provide a function for maintaining the opened state.

  The present invention is intended to solve such problems of the prior art, and facilitates pouring hot water on dried instant food in a container when eating instant food such as cup noodles. Therefore, an object of the present invention is to provide a lid member with an opened state holding function having a function of holding the opened lid material as it is in the opened state.

The present invention has been made to solve the above problems, and the invention according to claim 1 of the present invention has substantially the same outer shape as the opening of the container body (B), and has an outer periphery (6). ) Having an opening state holding function (A) having a pull tab (4) for opening, comprising a laminate in which a surface base material layer (20) and a plastic film layer (50) are laminated, Between the base material layer (20) and the plastic film layer (50), a release region (1) composed of a release agent layer (14) coated with a release agent, and the release region (1) was disposed. The non-peeling region (7) and the other non-peeling region (8) arranged adjacent to the peeling region (1) are partitioned into the non-peeling region (7) in the peeling region (1). Is an opening forming cut line (2) for forming an opening (5) for pouring or the like. Other non-peeling provided in a range from the innermost surface side of the layer (50) to the surface base material layer (20), and the opening pull tab (4) is disposed adjacent to the peeling region (1) An opening (5) is provided at the center tip in the peeling region (1) opposite to the boundary line between the region (8) and the peeling region (1) and in the vicinity of the opening pull tab (4). ) Is formed in a range from the innermost surface side of the plastic film layer (50) to the front substrate layer (20), and further the release agent layer (14) is formed in an uncoated dot pattern between the opening pull tab (4) and the boundary line between the peeling region (1) and the other non-peeling region (8). The coated dot pattern is formed of uncoated dots whose diameter increases step by step. It is an open state holding function with a lid material and butterflies.

  The invention according to claim 2 of the present invention is the lid member with the opening state holding function according to claim 1, wherein the opening forming cut line (2) and the opening start forming cut line (2a) are perforated. Or it is a lid | cover material with an open state holding | maintenance function characterized by consisting of either a continuous linear half cut or a perforated intermittent half cut.

  The invention according to claim 3 of the present invention is the lid member with an opened state holding function according to claim 1 or 2, wherein the surface base layer (20) is a paper layer (11) alone or at least the paper layer (11 ) Is a cover material with an opened state holding function, which is made of a laminate in which a protective film layer (10) is laminated on one side.

  The invention according to claim 4 of the present invention is the lid member with an opened state holding function according to any one of claims 1 to 3, wherein the plastic film layer (50) is an intermediate base material layer (30), It is a lid | cover material with an open state maintenance function characterized by consisting of a laminated body which laminated | stacked the sealant layer (40).

  The invention according to claim 5 of the present invention is the lid member with an opened state holding function according to claim 4, wherein the intermediate base material layer (30) comprises a thermoplastic resin layer (12), a barrier film layer (13), and It is a lid | cover material with an open state maintenance function characterized by consisting of the laminated body which laminated | stacked.

The lid material with an opened state holding function of the present invention is a lid material with an opened state holding function having an opening shape of the container main body and having an opening pull tab on the outer periphery, and a surface base material layer, A laminate comprising a plastic film layer and a release region comprising a release agent layer coated with a release agent between the surface base material layer and the plastic film layer, and a non-layer disposed in the release region. An opening forming cut line that is divided into a peeling area and another non-peeling area disposed adjacent to the peeling area, and that forms an opening for pouring or the like in the non-peeling area within the peeling area. Is provided in a range from the innermost surface side of the plastic film layer to the surface base material layer, and the opening pull tab is formed between the non-peeling region and the peeling region arranged adjacent to the peeling region. In the separation area on the opposite side of the boundary line A cut line for forming an opening start portion when forming an opening in the vicinity of the opening pull tab is provided in a range from the innermost surface side of the plastic film layer to the surface base material layer. Further, the release agent layer is formed as an uncoated dot pattern between the opening pull tab and a boundary line between the release region and another non-release region, and the uncoated dot pattern is in a stage. Since it is formed with uncoated dots with a large diameter, it can be opened to keep the opened lid as it is, so if you eat instant foods such as cup noodles, It is easy to pour hot water into dried instant foods inside the body, and it is processed into the tab part of the lid, so there is no restriction on the filling machine, and the lid is opened for all sizes of lid Hold It is possible to impart the kill function.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a plan view showing an embodiment of a lid material with an open state holding function (A) according to the present invention, and FIG. 2 is a release agent layer of the lid material with an open state holding function (A) according to the present invention ( 14) is an explanatory diagram for explaining an embodiment in which the uncoated dot pattern is formed with uncoated dot patterns, and the uncoated dot patterns are formed with uncoated dots whose diameter increases stepwise. Is a perspective view showing a state in which the lid material (A) with an opened state holding function according to the present invention is opened, an opening (5) such as pouring is formed, and the lid material (A) holds the opened state. FIG. 4 is a sectional view taken along line XX of FIG.

  As shown in FIG. 1, the cover material (A) with an opened state holding function of one embodiment of the present invention has substantially the same outer shape as the opening of the container body (B), and is used for opening the outer peripheral edge (6). It is a lid | cover material (A) with an open state holding function which has a pull tab (4). Moreover, as shown in FIG. 4, a surface base material layer (20) and a plastic film layer (50) are laminated, and a release agent is provided between the surface base material layer (20) and the plastic film layer (50). The release agent layer (14) coated with is partly formed.

  The front substrate layer (20) is composed of a paper layer (11) alone or a laminate in which a protective film layer (10) is laminated on at least one side of the paper layer (11). Moreover, the said plastic film layer (50) is comprised from the laminated body which laminated | stacked the intermediate | middle base material layer (30) and the sealant layer (40). Furthermore, the said intermediate | middle base material layer (30) is comprised from the laminated body which laminated | stacked the thermoplastic resin layer (12) and the barrier film layer (13).

  As shown in FIG. 1, the lid material (A) with an opened state holding function of the present invention has a release agent layer in which a release agent is applied between the surface base material layer (20) and the plastic film layer (50). (14) a peeling region (1), a non-peeling region (7) arranged in the peeling region (1), and another non-peeling region (1) arranged adjacent to the peeling region (1) 8).

  Next, an opening forming cut line (2) for forming an opening (5) such as pouring is provided in the non-peeling region (7) in the peeling region (1) as shown in FIG. The plastic film layer (50) is provided in the range from the innermost surface side to the front substrate layer (20).

  Moreover, as shown in FIG. 1, the opening pull tab (4) has a boundary line between the other non-peeling region (8) disposed adjacent to the peeling region (1) and the peeling region (1). Is an opening start portion forming cut-off line (5) that is provided at the center tip portion in the peeling region (1) on the opposite side and that forms the opening (5) in the vicinity of the opening pull tab (4). As shown in FIG. 4, 2a) is provided in the range from the innermost surface side of the plastic film layer (50) to the front substrate layer (20).

  The opening forming cut line (2) and the opening start forming cut line (2a) are either a perforation or a continuous linear half cut or a perforated intermittent half cut. May be.

  Moreover, the depth of the opening forming cut line (2) and the opening start forming cut line (2a) is within the thickness range of the plastic film layer (50), and the depth of the lid material (A) In consideration of the barrier property, the portion in contact with the paper layer (11) is preferable.

  The method for forming the opening forming cut line (2) and the opening start forming cut line (2a) uses, for example, a laser beam to cut a thick veneer plywood or a synthetic resin board into a predetermined shape. Use a flat plate punching die consisting of a male die that has a groove with a cutting device or a thread saw, incorporates a cutting edge or a sewing machine blade into the groove, and has sponge rubber attached to both sides of the groove or a rotary die cutter. May be used.

  Next, as shown in FIG. 2, the release agent layer (14) extends from the opening pull tab (4) to the boundary line between the release region (1) and the other non-release region (8). The uncoated dot pattern is formed with uncoated dots having a diameter (φ) that increases stepwise.

  As described above, the peel strength can be controlled by changing the pattern shape of the release agent layer (14) stepwise. That is, since the uncoated dot portion in the uncoated dot pattern is not coated with the release agent, the surface base material layer (20) constituting the lid material (A) and the plastic film layer (50) are completely formed. It is adhered to. Therefore, if the uncoated dot portion becomes large, the adhesive strength between the layers becomes strong, so that the peel strength at the time of peeling increases accordingly.

  From the above, in the lid material (A) of the present invention, the peeling between the opening pull tab (4) and the boundary line between the peeling region (1) and the other non-peeling region (8). The agent layer (14) is formed with an uncoated dot pattern, and the uncoated dot pattern is formed with uncoated dots having a diameter that increases stepwise to increase the peel strength stepwise. By gradually increasing the resistance, the surface base material layer (20) separated from the plastic film layer (50) at the time of opening has a squeezing effect, so that the surface base material layer (20) can be warped, The opening state of the lid member (A) can be maintained.

  The method for using the lid material (A) with an opened state holding function of the present invention as described above will be described in detail.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. By removing the surface base material layer (20) of the cover material (A), as shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) together with the surface base material layer (20). Is removed, and an opening (5) for injecting hot water appears in the peeling region (1).

  In the lid material (A) of the present invention, the release agent layer (14) between the opening pull tab (4) and the boundary line between the release region (1) and the other non-release region (8) is not yet formed. By forming the coated dot pattern and forming the uncoated dot pattern with uncoated dots whose diameter increases stepwise, the peel strength increases stepwise and the peel resistance gradually increases. Then, since the effect of squeezing the surface base material layer (20) occurs at the time of opening, the surface base material layer (20) can be warped, and the open state of the lid material (A) can be maintained, so It can be performed smoothly without interfering with the pouring work.

  Moreover, since the surface base material layer (20) is once squeezed, when the operation of pouring hot water is finished, the lid material (A) can be easily returned to the original unopened state. Moreover, since the lid | cover material (A) of this invention does not change the shape of the outer periphery of this lid | cover material (A), it can use the present production line, without modifying a filling line.

Next, the front base material layer (20), the plastic film layer (50), and the front base material layer (20) and the plastic film layer (50) constituting the lid material (A) with the opening state holding function of the present invention. The material used to constitute the release agent layer (14) that is partially formed between the two layers will be described in detail.

  As shown in FIG. 4, the cover material (A) with the unsealed state holding function is formed of a laminate including at least a surface base material layer (20) on the front surface side and the plastic film layer (50) on the inner surface side. Yes. More specifically, as the surface base layer (20), a paper layer (11) alone or a laminate in which a protective film layer (10) is laminated on at least one side of the paper layer (11) can be used.

For the paper layer (11), art paper, coated paper, or the like obtained by making pulp from a state in which cellulose is taken out by chemically or mechanically treating a plant material such as wood can be used. The thickness of the paper layer (11) is appropriately determined depending on mechanical strength (tensile strength, burst strength, impact strength, etc.), packaging workability, machine adaptability, economic efficiency, etc. It is desirable to use one having a weight of 40 g / m ² to 270 g / m ² , preferably having a basis weight in the range of 50 g / m ² to 130 g / m ² .

  Note that a printing ink layer (not shown) such as letters and patterns can be provided on the upper surface of the paper layer (11) for the purpose of improving the sales promotion effect of the product.

  The printing ink for forming the printing ink layer includes a color material composed of a pigment or a dye that imparts color to the ink, a resin that is fixed to a printed material while the color material is dispersed and held in fine particles, and the resin A vehicle composed of a solvent that can stably dissolve, disperse the pigments and dyes, maintain the fluidity of the ink, and transfer an appropriate amount of ink from the printing plate, and further disperse the coloring material For the purpose of improving color developability, preventing precipitation, and improving fluidity, it is formed from an auxiliary agent such as a surfactant, but the colorant is preferably a pigment with good weather resistance.

  The printing method for providing the printing ink layer is not particularly limited as long as it is a printing method capable of printing on the paper layer (11), but copper plating is applied to the surface of an iron cylinder (cylinder) to form a base, A release layer is provided on the copper-plated surface, and further copper-plated, and the surface is mirror-polished to create a recess (cell) by engraving or corrosion, and the printing ink in the cell is applied. A gravure printing method is preferable in which the paper layer (11) is transferred to the upper surface, and even a toned material can be printed in a colorful manner and has a high appealing effect.

  Next, as a material of the protective film layer (10), for example, a polyethylene terephthalate film (PET), a polypropylene film (PP), a polyamide film (PA), a polyvinyl chloride film (PVC), a polyethylene film (PE), A polybutylene terephthalate film (PBT), a polycarbonate film (PC), a polystyrene film (PS), ordinary cellophane (PT), etc. can be used.

  In addition, the thickness of the protective film layer (10) is preferably in the range of 3 to 200 μm, more preferably in the range of 6 to 30 μm, in consideration of processability.

  Next, the method of laminating the paper layer (11) and the protective film layer (10) includes, for example, a wet lamination method, a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, an extrusion lamination method, and A known method such as a sandwich lamination method using the extrusion lamination method can be used.

For example, in the wet lamination method, a water-soluble adhesive is applied to one substrate, and the adhesive is laminated with the other substrate in a wet state, and then the moisture is evaporated and dried with a drying apparatus to be bonded. It is a method.

  Next, the dry lamination method is composed of three sections, a coating unit for applying an adhesive on a film, a drying device, and a nip roller unit, and an unwinding, winding, and tension control system.

  The coating portion generally employs a gravure roll coating method or a reverse roll coating method.

  The adhesive layer (not shown) used in the dry lamination method is generally made of an adhesive for laminating such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, etc. Can be used.

  As the lamination adhesive, a solvent-type adhesive or a solvent-free adhesive is used. However, when a solvent-free adhesive is used, a drying apparatus is unnecessary, and in particular, a non-solvent dry lamination method and I'm calling.

  The hot-melt lamination method is a method in which a hot-melt adhesive such as a heat-melted ethylene-vinyl acetate copolymer (EVA) is applied on one substrate, and the other substrate is immediately laminated.

  In the extrusion lamination method, a thermoplastic resin such as a polyethylene resin or a polypropylene resin is heated, dissolved in a cylinder called a cylinder, extruded by applying pressure with a screw, and called a T die at the tip of the cylinder. This is a method in which a resin dissolved in a curtain shape is extruded from a thin slit to form a film and then laminated to a laminate substrate.

  At this time, using the extrusion lamination method, it is also possible to use a sandwich lamination method in which a thermoplastic resin such as polyethylene or polypropylene is used instead of an adhesive and one substrate is laminated with the other substrate. it can.

  Next, the said plastic film layer (50) is comprised by the laminated body which laminated | stacked the intermediate | middle base material layer (30) and the sealant layer (40). The intermediate base material layer (30) is composed of a barrier film layer (13) for providing a barrier property of the lid material (A), but is replaced with an adhesive for laminating with the paper layer (11). A layer structure in which a thermoplastic resin layer (12) is added may be used.

  Examples of the barrier film layer (13) include polyethylene terephthalate film (PET), polyamide film (PA), polycarbonate film (PC), polyvinylidene chloride film (PVDC), polyvinyl alcohol film (PVA), and ethylene-vinyl alcohol. Copolymer film (EVOH), resin film having a thin film of inorganic oxide (silicon oxide, aluminum oxide, etc.), film such as saponified ethylene-vinyl acetate copolymer, polyethylene terephthalate (PET), polyamide (PA), It is possible to use a film obtained by coating polyvinylidene chloride (PVDC) on a saponified product of polyvinyl alcohol or ethylene-vinyl acetate copolymer, or a laminate obtained by combining one or more of these films. That.

  Further, the thickness of the barrier film layer (13) is preferably in the range of 3 to 200 μm, more preferably in the range of 6 to 30 μm, in consideration of processability.

  Examples of the thermoplastic resin layer (12) include a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a high density polyethylene resin (HDPE), and a linear low density polyethylene resin (L-LDPE). , Polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic Resins such as acid ester copolymers, ethylene-acrylic acid ester copolymers, ionomer resins, and ethylene-vinyl acetate copolymers (EVA) can be used.

  The thermoplastic resin layer (12) serves as an adhesive when the paper layer (11) and the barrier film layer (13) are laminated.

  As a lamination method, a sandwich lamination method using the extrusion lamination method can be used.

Next, the innermost sealant layer (40) includes, for example, a low-density polyethylene resin (LDPE), a linear low-density polyethylene resin (L-LDPE), a high-density polyethylene resin (HDPE) excellent in heat sealability, Polyolefin resin such as unstretched polypropylene resin (CPP) or ethylene copolymer such as ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA) A film of coalescence, or a hot melt adhesive made of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer or the like may be provided at a coating amount of about 15 to 25 g / m ² , and these sealant layers (40) Depending on the selection of the sealing conditions, sufficient sealing performance with the flange part (3) of the container body (B) Can allow Le resistance) and the easy-open (the easy peeling property).

  However, in the lid material (A) with an opened state holding function of the present invention, the container body (B) is a molded container made of a laminate material in which polyethylene resin (PE) is laminated on paper with an extruder, and a polystyrene resin (PS) molded container. In order to be compatible with various materials, such as polypropylene resin (PP) molded containers, molded containers made of laminated materials in which polystyrene resin (PS) sheets and polyethylene terephthalate resin (PET) sheets are laminated, When opening the lid (A) at the same time as strongly adhering to the end face of the flange portion (3) of the container body (B), the container body (B) can be easily opened (easy peel property) and more complete. Select the sealant layer (40).

  In order to satisfy such requirements, the sealant layer (40) is provided with various functions, one of which is the design of an easy-opening mechanism, and examples thereof include an interface peeling mechanism and an interlayer peeling mechanism. A cohesive peeling mechanism.

  Among these, the cohesive peeling mechanism is designed by blending a base resin made of a thermoplastic resin and an incompatible or partially compatible thermoplastic resin, and the peeling principle is as an incompatible or partially compatible system. When the unsealed thermoplastic resin blend layer has a low cohesive force, it is not the interface between the sealant layer (40), which is the innermost layer of the lid (A), and the adherend. For example, the cohesive failure of a compatible or partially compatible blend layer may be used.

  From the above, the resin forming the sealant layer (40) is a method using a mixed resin in which a thermoplastic resin is used as a base resin and an incompatible or partially compatible thermoplastic resin is polymer blended with the base resin. Is preferred.

For example, as the base resin, various resins can be used according to the material of the seal end surface of the flange portion (3) of the container body (B), such as a low density polyethylene resin (LDPE), a medium Density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), ethylene-propylene copolymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), An ethylene-methacrylic acid copolymer (EMAA), an ethylene-methacrylic acid ester copolymer, an ethylene-acrylic acid ester copolymer, an ionomer resin, an ethylene-vinyl acetate copolymer (EVA), or the like can be used. Further, as these resins, the above resin alone or a resin mixed with the above resin may be used.

  Further, in the resin, low molecular weight petroleum resin such as aliphatic petroleum resin, aromatic petroleum resin, copolymer petroleum resin, alicyclic petroleum resin, rosin, polymerized rosin, hydrogenated rosin, rosin glycerin. An appropriate amount may be added to the above resin using rosins such as esters and hydrogenated products or polymers thereof, rosin pentaerythritol and hydrogenated products or polymers thereof as tackifiers.

  Next, as a blending thermoplastic resin to be blended with the base resin, a resin that is incompatible or partially compatible with the base resin is used.

  Depending on the type of base resin, for example, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), polypropylene resin (PP), polybutene resin (PB), ethylene-propylene Copolymer (EP), ethylene-α olefin copolymer, polyethylene terephthalate resin (PET), polyamide resin (Ny), ethylene-acrylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA) Such as acid copolymer such as ethylene / methyl acrylate copolymer (EMA), ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl methacrylate copolymer (EMMA), and ethylene -Vinyl acetate copolymer (EVA), or a saponified product thereof, Styrene resin, polymethylmethacrylate resin, etc. can be used. In addition to the above-mentioned thermoplastic resins, various thermoplastic resins such as acid-modified products can be used. However, a resin obtained by blending a plurality of resins may be used.

  Further, a copolyester having microbial degradability synthesized by microorganisms can also be used as the base resin. The copolyester is called a microbial polyester as another name, and is a microbial energy storage material corresponding to animal neutral fat, and is a highly crystalline thermoplastic. Since this highly crystalline polyester has a function of microbial degradability, it has attracted attention as an environmentally non-polluting plastic.

  In the present invention, when the adherend that is the end surface to be sealed of the flange portion (3) of the container body (B) that is covered with the lid material (A) is a polyethylene resin (PE), the base resin / for blending The combinations of thermoplastic resins are polyethylene resin (PE) / ethylene-methacrylic acid copolymer (EMAA), polyethylene resin (PE) / ethylene-vinyl acetate copolymer (EVA), polyethylene resin (PE) / ethylene. A combination of acrylic acid copolymer (EAA), polyethylene resin (PE) / ethylene-ethyl acrylate copolymer (EEA), and the like are preferable.

  Next, when the adherend of the container body (B) is a polystyrene resin (PS), an ethylene-vinyl acetate copolymer (EVA) / polybutene resin is used as the base resin / blend thermoplastic resin combination. A combination of (PB), polyethylene resin (PE) + elastomer + petroleum resin / polybutene resin (PB) is preferable.

  Next, when the adherend of the container body (B) is a polypropylene resin (PP), the combination of the base resin / the thermoplastic resin for blending is polypropylene resin (PP) / polystyrene resin (PS), polypropylene A combination of resin (PP) / polyethylene resin (PE) is preferred.

  In addition, the thickness of the sealant layer (40) is preferably in the range of 15 to 100 μm, more preferably in the range of 30 to 70 μm, considering heat seal strength, workability, and the like.

  Examples of the release agent layer (14) include edible surfactants such as lecithin, nitrified cotton-based (nitrocellulose) resins, polyamide resins, polyester-based resins, and the like. A release agent mixed with polyester wax or silicon can be used.

  A gravure roll coating method, a silk screen method, etc. can be used for the method of applying these release agents to the paper layer (11).

  Hereinafter, the lid material (A) with an opened state holding function of the present invention will be described in more detail with specific examples.

As shown in FIG. 4, the laminate used for the cover material (A) with an opened state holding function of the present invention has a biaxially stretched polyethylene terephthalate film (PET) having a thickness of 12 μm on the outermost protective film layer (10). ), A piece of art paper having a basis weight of 84.9 g / m ² is used for the paper layer (11), and lamination is carried out by a wet lamination method on the paper layer (11). ) Was obtained.

  Next, a wax-type release agent is used on the surface of the paper layer (11) of the surface base material layer (20), and a plate made by making an uncoated pattern in four stages as shown in FIG. Then, a release agent layer (14) was provided by a gravure roll coating method. That is, 1) All solids 2) 0.3 mmφ dot uncoated pattern 3) 0.4 mmφ dot uncoated pattern 4) A release agent layer pattern of 0.5 mmφ dot uncoated pattern was prepared.

  Next, as the barrier film layer (13) of the intermediate base material layer (30), a biaxially stretched polyethylene terephthalate film (PET) having a thickness of 12 μm is used, and the barrier film layer (13) and the front base material layer ( The paper layer (11) constituting 20) was laminated by a sandwich lamination method through a thermoplastic resin layer (12) made of low density polyethylene resin (LDPE). Further, an ethylene-vinyl acetate copolymer (EVA) / polybutene resin (PB) composed of a base resin / blend thermoplastic resin combination was used as an easy peel sealant on the barrier film layer (13). Using a mixed resin, a sealant layer (40) is provided by an extrusion lamination method, and the outermost protective film layer (10) / paper layer (11) / patterned release agent layer (14) / thermoplastic resin. A laminate for the lid material (A) composed of layer (12) / barrier film layer (13) / sealant layer (40) was obtained.

Subsequently, the wound laminate is largely cut into sheets, and then the paper layer (11) of the front base material layer (20) from the sealant layer (40) on the innermost surface side of the plastic film layer (50). The opening forming cut line (2) consisting of a linear half-cut that continues to the portion in contact with) and the opening start forming cut line (2a) were processed. Next, the cover material (A) with an opening state holding function of the present invention was obtained through a small cut and punching process (the wound laminate was not cut into a single sheet, and the wound laminate was In some cases, cutting lines and punching processes are performed on an integrated line).

  The lid material (A) having an opening state holding function by heat-sealing the lid material (A) thus obtained to the flange portion (3) of a container body (B) made of a polystyrene resin (PS) molded in advance. Completed a container with cup noodles covered with.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the opening state of the lid member (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 1, the release agent layer pattern was 1) 0.1 mmφ dot uncoated pattern 2) 0.4 mmφ dot uncoated pattern 3) 0.5 mmφ dot uncoated pattern 4) 0.6 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the open state of the lid (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 1, the release agent layer pattern was 1) 0.2 mmφ dot uncoated pattern 2) 0.5 mmφ dot uncoated pattern 3) 0.6 mmφ dot uncoated pattern 4) 0.7 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the open state of the lid (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

As shown in FIG. 4, the laminate used for the cover material (A) with an opened state holding function of the present invention has a biaxially oriented polypropylene film (OPP) having a thickness of 20 μm for the outermost protective film layer (10). A piece of art paper having a basis weight of 84.9 g / m ² is used for the paper layer (11), and the protective film layer (10) is laminated on the paper layer (11) by wet lamination. The surface base material layer (20) which laminated | stacked was obtained.

  Next, a wax-type release agent is used on the surface of the paper layer (11) of the surface base material layer (20), and a plate made by making an uncoated pattern in four stages as shown in FIG. Then, a release agent layer (14) was provided by a gravure roll coating method. That is, 1) All solids 2) 0.3 mmφ dot uncoated pattern 3) 0.4 mmφ dot uncoated pattern 4) A release agent layer pattern of 0.5 mmφ dot uncoated pattern was prepared.

  Next, as the barrier film layer (13) of the intermediate base material layer (30), an ethylene-vinyl alcohol copolymer film (EVOH) having a thickness of 25 μm is used, and the barrier film layer (13) and the surface base material are used. Lamination was performed by a sandwich lamination method on the surface of the paper layer (11) constituting the layer (20) through a thermoplastic resin layer (12) made of low-density polyethylene resin (LDPE). Further, a mixture of an ethylene-vinyl acetate copolymer (EVA) / polybutene resin (PB) composed of a combination of a base resin / a thermoplastic resin for blending as an easy peel sealant on the barrier film layer (13). Resin is used, and the sealant layer (40) is provided by the extrusion lamination method, and the outermost protective film layer (10) / paper layer (11) / patterned release agent layer (14) / thermoplastic resin layer A laminate for the cover material (A) composed of (12) / barrier film layer (13) / sealant layer (40) was obtained.

  Subsequently, the wound laminate is largely cut into sheets, and then the paper layer (11) of the front base material layer (20) from the sealant layer (40) on the innermost surface side of the plastic film layer (50). The opening forming cut line (2) consisting of a linear half-cut that continues to the portion in contact with) and the opening start forming cut line (2a) were processed. Next, the cover material (A) with an opened state holding function of the present invention was obtained through small cutting and punching. (In some cases, the winding-like laminate is not cut into a single sheet, and the winding-like laminate is used to perform a cutting line and a punching process on an integrated line).

  The lid material (A) having an opening state holding function by heat-sealing the lid material (A) thus obtained to the flange portion (3) of a container body (B) made of a polystyrene resin (PS) molded in advance. Completed a container with cup noodles covered with.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4) and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the opening state of the lid member (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 4, the release agent layer pattern was 1) 0.1 mmφ dot uncoated pattern 2) 0.4 mmφ dot uncoated pattern 3) 0.5 mmφ dot uncoated pattern 4) 0.6 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the open state of the lid (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 4, the release agent layer pattern was 1) 0.2 mmφ dot uncoated pattern 2) 0.5 mmφ dot uncoated pattern 3) 0.6 mmφ dot uncoated pattern 4) 0.7 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the opening state of the lid member (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

As shown in FIG. 4, the laminate used for the cover material (A) with an opened state holding function of the present invention has a biaxially stretched polyethylene terephthalate film (PET) having a thickness of 12 μm on the outermost protective film layer (10). ), A piece of art paper having a basis weight of 84.9 g / m ² is used for the paper layer (11), and lamination is carried out by a wet lamination method on the paper layer (11). ) Was obtained.

  Next, a wax-type release agent is used on the surface of the paper layer (11) of the surface base material layer (20), and a plate made by making an uncoated pattern in four stages as shown in FIG. Then, a release agent layer (14) was provided by a gravure roll coating method. That is, 1) All solids 2) 0.3 mmφ dot uncoated pattern 3) 0.4 mmφ dot uncoated pattern 4) A release agent layer pattern of 0.5 mmφ dot uncoated pattern was prepared.

Next, as the barrier film layer (13) of the intermediate base material layer (30), a polyethylene terephthalate film having a thickness of 20 nm formed by vacuum deposition of aluminum oxide, which is an inorganic oxide, is used. The layer (13) and the surface of the paper layer (11) constituting the surface base material layer (20) are sandwiched by a sandwich lamination method through a thermoplastic resin layer (12) made of low-density polyethylene resin (LDPE). Lamination was performed. Further, a mixture of an ethylene-vinyl acetate copolymer (EVA) / polybutene resin (PB) composed of a combination of a base resin / a thermoplastic resin for blending as an easy peel sealant on the barrier film layer (13). Resin is used, and the sealant layer (40) is provided by the extrusion lamination method, and the outermost protective film layer (10) / paper layer (11) / patterned release agent layer (14) / thermoplastic resin layer A laminate for the cover material (A) composed of (12) / barrier film layer (13) / sealant layer (40) was obtained.

  Subsequently, the wound laminate is largely cut into sheets, and then the paper layer (11) of the front base material layer (20) from the sealant layer (40) on the innermost surface side of the plastic film layer (50). The opening forming cut line (2) and the opening start forming cut line (2a), each of which is a linear half-cut that continues to the portion in contact with (), were processed. Next, the cover material (A) with an opened state holding function of the present invention was obtained through small cutting and punching. (In some cases, the winding-like laminate is not cut into a single sheet, and the winding-like laminate is used to perform a cutting line and a punching process on an integrated line).

  The lid material (A) having an opening state holding function by heat-sealing the lid material (A) thus obtained to the flange portion (3) of a container body (B) made of a polystyrene resin (PS) molded in advance. Completed a container with cup noodles covered with.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4), and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the open state of the lid (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 7, the release agent layer pattern was 1) 0.1 mmφ dot uncoated pattern 2) 0.4 mmφ dot uncoated pattern 3) 0.5 mmφ dot uncoated pattern 4) 0.6 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

First, pinch the opening pull tab (4) and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) in the non-peeling region (7) is removed together with the surface base material layer (20), and an opening for injecting hot water into the peeling region (1). Part (5) appeared.

  Further, when the lid (A) is opened, the peel strength is gradually increased from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peel resistance is gradually increased by increasing the size, the surface base material layer (20) is effectively squeezed at the time of opening, the surface base material layer (20) can be warped, and the lid material (A) Since the open state could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

  In Example 7, the release agent layer pattern was 1) 0.2 mmφ dot uncoated pattern 2) 0.5 mmφ dot uncoated pattern 3) 0.6 mmφ dot uncoated pattern 4) 0.7 mmφ dot uncoated A cover material (A) with an open state holding function was produced in the same manner except that the pattern was changed to four stages.

  Next, using such a container containing cup noodles with an opening state holding function, the opening state holding functionality and the like were evaluated.

  First, pinch the opening pull tab (4) and use the opening start portion forming cut line (2a) provided in the vicinity of the opening pull tab (4) as a trigger. The surface base material layer (20) of the lid material (A) was removed. As shown in FIG. 3, the plastic film layer (50) was removed together with the front substrate layer (20), and an opening (5) for injecting hot water appeared in the peeling region (1). .

  In addition, when the lid (A) is opened, the peel strength is stepped from the opening pull tab (4) to the boundary line between the peeling region (1) and the other non-peeling region (8). Since the peeling resistance is gradually increased by increasing the thickness, the effect of squeezing the surface base layer (20) separated from the plastic film layer (50) at the time of opening is generated, and the surface base layer (20) is warped. Since the opening state of the lid member (A) could be maintained, the operation of pouring hot water could be performed smoothly. Furthermore, since the surface base material layer (20) was once squeezed, after the operation of pouring hot water was completed, the lid material (A) could be easily returned to the original unopened state. In addition, since the lid | cover material (A) of this invention did not change the shape of the outer periphery of this lid | cover material (A), it was able to use the present manufacturing line, without modifying the filling line.

It is a top view which shows one Example of the cover material with an open state holding | maintenance function which concerns on this invention. The release agent layer of the lid member with an open state holding function according to the present invention is formed of an uncoated dot pattern, and the uncoated dot pattern is formed of uncoated dots whose diameter increases stepwise. It is explanatory drawing explaining 1 Example. It is a perspective view which shows the state which unseal | opens the lid | cover material with an opening state holding | maintenance function which concerns on this invention, the opening parts, such as pouring, are formed, and the lid | cover material is holding the opening state. FIG. 2 is a side sectional view taken along line XX in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Peeling area 2 ... Cut-out line for opening part 2a ... Cut-out line for opening start part 3 ... Flange part 4 ... Pull tab for opening 5 ... Opening part 6 ... Outer rim 7 ... Non-peeling region 8 ... Other non-peeling region 10 ... Protective film layer 11 ... Paper layer 12 ... Thermoplastic resin layer 13 ... Barrier film layer 14 ... Release agent layer 20 ... Front base material layer 30 ... Intermediate base material layer 40 ... Sealant layer 50 ... Plastic film layer A ... Lid material B ... Container body

Claims (5)

It is a lid material with an opening state holding function that has substantially the same outer shape as the opening of the container body and has an opening pull tab on the outer periphery,
Consists of a laminate in which a surface base material layer and an uncut plastic film layer for hot water cut holes are laminated,
Between the surface base material layer and the plastic film layer, a release region composed of a release agent layer coated with a release agent, a non-release region disposed in the release region, and an adjacent to the release region Partitioned into other non-peeled areas,
In the non-peeling region in the peeling region, an opening forming cut line for forming an opening such as pouring is provided in a range from the innermost surface side of the plastic film layer to the surface base material layer,
The opening pull tab is provided at a central tip portion in the peeling region opposite to the boundary line between the other non-peeling region and the peeling region disposed adjacent to the peeling region, and for opening A cut line for forming an opening start portion when forming an opening in the vicinity of the pull tab is provided in a range from the innermost surface side of the plastic film layer to the surface base material layer,
Further, the release agent layer is formed with an uncoated dot pattern between the peeling region and the boundary line between the other non-peeling region arranged adjacent to the peeling region with the opening pull tab as a base point, The uncoated dot pattern is formed of uncoated dots having a diameter that increases stepwise, and a lid material with an unsealed state holding function.   2. The opening forming cut line and the opening start forming cut line are composed of a perforation or a continuous linear half cut or a perforated intermittent half cut. The cover material with an opening state maintenance function of description.   The lid member with an unsealed state holding function according to claim 1 or 2, wherein the front base material layer is composed of a single paper layer or a laminate in which a protective film layer is laminated on at least one side of the paper layer.   The lid material with an unsealed state holding function according to any one of claims 1 to 3, wherein the plastic film layer comprises a laminate in which an intermediate base material layer and a sealant layer are laminated.   The said intermediate | middle base material layer consists of a laminated body which laminated | stacked the thermoplastic resin layer and the barrier film layer, The lid | cover material with an open state maintenance function of Claim 4 characterized by the above-mentioned.

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