JP5569056B2 - Lid material - Google Patents

Description

  The present invention relates to a lid material that is thermally bonded to a tray-like or cup-like container for packaging snack foods, instant noodles, and the like, and more specifically, the outer lid is peeled to peel off the outer lid and the outlet. It is related with the cover material which can form.

  Conventionally, as a cover material of a container in which an opening is formed in the inner lid by peeling off the outer lid, for example, paper, polyethylene, aluminum foil, and a sealing agent are laminated from the outside. It is divided into a peeling area where a release agent is applied between the layers, a non-peeling area arranged in the peeling area, and another non-peeling area arranged adjacent to the peeling area, and from the sealing agent layer A configuration in which a half cut for forming an opening of hot water reaching the middle part of the paper layer is formed, and a half cut for peeling from the sealant layer to the middle part of the paper layer is formed at the neck of the knob in the peeling region By peeling the peeling area from the part where the peeling half-cut is formed, the area surrounded by the peeling half-cut is extracted and an opening is formed in a part of the lid that is adhered to the container Is known Is (e.g., see Patent Document 1).

  However, in the cover material having the above-described configuration, when the cover member is thermally bonded to the flange portion of the container, the cover member and the container are misaligned, and the peeling half-cut portion is thermally bonded at a position where it overlaps the flange portion of the container. In addition, the sealing agent layer that has been half-cut for peeling by thermal bonding is re-bonded, and the half-cut effect disappears and an opening is sometimes not formed.

Japanese Utility Model Publication No. 57-120472

  Accordingly, an object of the present invention is to provide a lid member that can easily form an opening in the inner lid by peeling the outer lid and the inner lid from the opening cut.

The present invention has been made to achieve the above object, and the present invention according to claim 1 includes an outer lid having at least a base material layer and an inner lid having an easy-peeling resin layer in at least the innermost layer. A lid that has a configuration including a knob portion that is laminated via an adhesive resin layer and protrudes outward at the outer peripheral edge, and is thermally bonded to the flange portion of the container provided with a flange portion at the outer peripheral edge to seal the container An easy-peeling region comprising a release agent layer between the outer lid and the inner lid, and a non-peeling region disposed adjacent to the easy-peeling region, and the easy-peeling In the region, an opening notch having a closed shape penetrating the inner lid and the adhesive resin layer from the easy peel resin layer side is formed, and the inner lid is disposed between the knob and the opening notch. Bisecting the inner lid and the adhesive resin from the easy peel resin layer side A core layer made of a resin containing a resin having a melting point higher than that of the resin of the thermal adhesive resin layer and the thermal adhesive resin layer at least from the innermost layer side. The heat-adhesive resin layer and the core layer are releasably laminated, and the lid is thermally bonded to the flange portion of the container to seal the container, and then the knob portion of the lid is removed. When picking up and pulling, at the outer edge of the thermal adhesive part, the thermal adhesive resin layer of the easy peel resin layer breaks, and further delamination occurs between the thermal adhesive resin layer and the core layer, The lid material is characterized in that opening is started .

According to the second aspect of the present invention, an outer lid having at least a base material layer and an inner lid having an easy-peeling resin layer at least on the innermost layer are laminated via an adhesive resin layer at a position opposite to the outer peripheral edge. A lid material that has a structure including an opening knob protruding outward and a hot water hole forming knob, and is thermally bonded to a flange portion of a container provided with a flange on the periphery of the opening to seal the container In the easy peeling region provided with a release agent layer between the outer lid and the inner lid from the hot water cut hole forming knob side toward the unsealing knob portion side, A non-peeling region disposed adjacent to the easy-peeling region, and a plurality of hot water cut-off cups that penetrate the inner lid and the adhesive resin layer from the easy peelable resin layer side. A hole cut is formed, and the hot water cut hole forming knob and the hot water cut hole cut are formed. The inner lid is bisected between the inner peel and the adhesive resin layer from the easy peel resin layer side to form a cut hole for hot water cut hole, and the easy peel resin layer is at least the innermost layer side A core layer made of a resin containing a resin having a melting point higher than that of the resin of the heat adhesive resin layer and the resin of the heat adhesive resin layer is laminated, and the heat adhesive resin layer and the core layer are laminated so as to be peelable , After the lid material is thermally bonded to the flange portion of the container and the container is sealed, the easy peel resin is formed at the outer edge of the thermal bonding portion when the hot water hole forming knob portion of the lid material is picked up and pulled. The heat-adhesive resin layer of the layer is broken, and further, delamination occurs between the heat-adhesive resin layer and the core layer, and opening is started .

  The lid material according to claim 1 of the present invention is such that an outer lid having at least a base material layer and an inner lid having an easy peel resin layer at least on the innermost layer are laminated via an adhesive resin layer outwardly on the outer peripheral edge. A lid member that includes a projecting knob portion and is thermally bonded to a flange portion of a container provided with a flange portion at the periphery of the opening to seal the container. An easy-peeling region having a release agent layer in between, and a non-peeling region disposed adjacent to the easy-peeling region, and the inside of the easy-peeling region from the easy peel resin layer side An opening notch having a closed shape penetrating the lid and the adhesive resin layer is formed, and the inner lid is divided in half between the knob and the opening notch, and the inner lid is formed from the easy peel resin layer side. A peeling start cut through the adhesive resin layer is formed, and the easy By making the peelable resin layer a structure in which the heat-adhesive resin layer and the core layer are detachably laminated from at least the innermost layer side, the outer lid is peeled from the inner lid from the portion where the opening cut is formed. As a result, the region surrounded by the opening cut of the inner lid is removed in a state where it is adhered to the outer lid, so that the opening can be easily formed in the inner lid. In particular, when the easy-peelable resin layer is configured such that the heat-adhesive resin layer and the core layer are detachably laminated from at least the innermost layer side, the lid material is thermally bonded to the flange portion of the container. Even if the gap between the lid and the container is displaced and the peeling start notch is thermally bonded at the position where it overlaps the flange part of the container, when the knob is pulled up, the outer peripheral edge is first thermally bonded to the flange part. When the heat-adhesive resin layer of the lid breaks and then peels off between the heat-adhesive resin layer and the core layer, the peel-off layer is separated from the release agent layer and the adhesive resin layer when the peel reaches the cut for starting peeling. The outer lid can be reliably peeled from the inner lid in the easy peeling region.

  According to the second aspect of the present invention, an outer lid having at least a base material layer and an inner lid having an easy-peeling resin layer at least on the innermost layer are laminated via an adhesive resin layer at a position opposite to the outer peripheral edge. A lid material that has a structure including an opening knob protruding outward and a hot water hole forming knob, and is thermally bonded to a flange portion of a container provided with a flange on the periphery of the opening to seal the container In the easy peeling region provided with a release agent layer between the outer lid and the inner lid from the hot water cut hole forming knob side toward the unsealing knob portion side, A non-peeling region disposed adjacent to the easy-peeling region, and a plurality of hot water cut-off cups that penetrate the inner lid and the adhesive resin layer from the easy peelable resin layer side. A hole cut is formed, and the hot water cut hole forming knob and the hot water cut hole cut are formed. The inner lid is bisected between the inner peel and the adhesive resin layer from the easy peel resin layer side to form a cut hole for hot water cut hole, and the easy peel resin layer is at least the innermost layer side The above-mentioned effect can be obtained by pulling up the knob for forming the hot water cut hole of the lid heat-bonded to the container. The hot water outlet can be easily formed in the inner lid. Further, when the opening knob is pulled up, the lid member can be easily peeled from the container.

(A) which shows 1st embodiment of the cover material which concerns on this invention is a top view, (b) is a bottom view. It is XX sectional drawing in FIG. 1 (a) which shows the laminated structure of 1st embodiment. It is sectional drawing which shows the state which adhere | attached the cover material of 1st embodiment which concerns on this invention to the container opening part. It is sectional drawing which shows the state which peeled partially the outer cover of the cover material of 1st embodiment adhere | attached on the container opening part. (A) which shows 2nd embodiment of the cover material which concerns on this invention is a top view, (b) is a bottom view. It is YY sectional drawing in FIG. 5 (a) which shows the laminated structure of 2nd embodiment. It is a fragmentary sectional view which shows the state which adhere | attached the cover material of 2nd embodiment which concerns on this invention to the container opening part. It is a fragmentary sectional view which shows the state which peeled partially the outer cover of the cover material of 2nd embodiment adhere | attached on the container opening part.

The above-described present invention will be described in detail below with reference to the drawings.
1A is a plan view, FIG. 1B is a bottom view showing a first embodiment of a lid according to the present invention, and FIG. 2 is a cross-sectional view of FIG. X sectional view, FIG. 3 is a sectional view showing a state in which the lid of the first embodiment according to the present invention is bonded to the container opening, and FIG. 4 is an outer lid of the lid of the first embodiment bonded to the container opening. FIG. 5 is a plan view, FIG. 5 is a bottom view, and FIG. 6 is a bottom view of the second embodiment of the lid according to the present invention. 5A is a cross-sectional view taken along line YY in FIG. 5A, FIG. 7 is a partial cross-sectional view showing a state in which the lid according to the second embodiment of the present invention is bonded to the container opening, and FIG. 8 is the container opening. It is a fragmentary sectional view which shows the state which peeled off the outer lid of the lid | cover material of 2nd embodiment adhere | attached to 2 in the figure, 2 is a knob | pick part, 2'a is a knob part for hot water cut hole formation, 2 'b is an opening knob, 3 is an opening cut, 3' is a cut hole for cut, 4 is a cut for peeling start, 4 'is a cut for forming a cut hole, 5 is a flange portion, 6 is a heat bonding portion, 7 is an opening, 8 is a hot water hole, 10 and 10 'are outer lids, 11 is a base material layer, 12 is a release agent layer, 13 is a surface layer, 14 is an adhesive layer, 20 is an adhesive resin layer, and 30 is an inner Lid, 31 is an easy peel resin layer, 31a is a heat-adhesive resin layer, 31b is a core layer, 31c is a laminate resin layer, 32 is an intermediate layer, A and A 'are lid materials, B and B' are containers, S Denotes an easy peeling region, and N denotes a non-peeling region.

  The first embodiment of the lid according to the present invention is as shown in FIGS. As shown in FIG. 1, the lid A has a substantially circular shape with a knob 2 projecting outward on the outer peripheral edge, and is thermally bonded to a flange provided at the peripheral edge of the opening of the container to seal the container. It is used as a lid material. The size of the lid A is preferably substantially the same as or slightly larger than the outer peripheral edge of the flange portion of the container, and the shape of the lid A may be determined according to the shape of the outer peripheral edge of the flange portion, For example, a circle, an ellipse, a square, etc. FIG. 1A is a plan view seen from the outer surface side of the lid A and shows a state in which the outer lid 10 is visible. The outer surface of the lid A is printed on the design for sales promotion, the contents of the product, etc. (not shown). (B) of FIG. 1 is a bottom view seen from the inner surface side (the surface side thermally bonded to the container) of the lid material A, and shows a state where the easy peel resin layer 31 constituting the inner lid 30 is visible. ing. On the inner surface of the lid member A, a substantially square opening notch 3 with rounded corners is formed. The opening cut 3 is not limited to a quadrilateral shape as long as it is a closed shape, and may be arbitrarily formed depending on the ease with which the contents can be shaken out and poured, and the contents can be solid, liquid, powder, etc. A plurality of opening notches 3 may be formed in order to control the amount of ejection and the amount of dispensing depending on the properties of the above. However, it is preferable to form the opening notches 3 in the vicinity of the inner peripheral edge of the flange portion because the amount of contents remaining in the container is reduced. Further, between the knob portion 2 and the opening notch 3, a separation start notch 4 is formed by dividing the inner lid 30 into two.

  FIG. 2: shows XX sectional drawing in FIG. 1 (a) of the cover material A of this invention. As shown in FIG. 2, the lid material A of the present invention includes an outer lid 10 having a base material layer 11, and an inner lid 30 in which an aluminum foil and an easy peel resin layer 31 are laminated on the innermost layer as an intermediate layer 32. In this configuration, the adhesive resin layers 20 are stacked. Between the outer lid 10 and the inner lid 30, an easy-peeling region S provided with the release agent layer 12 and a non-peeling region N adjacent to the easy-peel region S and having no release agent layer are disposed. Has been. The easy peeling region S is formed in a region including the peeling start cut 4 and the opening cut 3 on the knob portion 2 side, and is divided from the non-peeling region N by about 2/5 of the cover material A. The easy peeling region S may be usually less than half of the area of the lid A. For easy understanding, FIG. 1 (b) shows the easy-peeling region S through a dotted line pattern. In the easy peeling region S, a closed opening notch 3 penetrating the inner lid 30 and the adhesive resin layer 20 is formed from the easy peel resin layer 31 side, and the region surrounded by the opening notch 3 is peeled off. There is no agent layer, and the inner lid 30 and the outer lid 10 are bonded via the adhesive resin layer 20. Although there may be a release agent layer in the region surrounded by the opening notches 3, it is preferable that there is no release agent layer because the opening can be reliably formed in the inner lid 30. Further, between the knob 2 and the opening notch 3, an inner lid 30 is divided into two, and a peeling start notch 4 penetrating the inner lid 30 and the adhesive resin layer 20 from the easy peel resin layer 31 side is formed. . The peeling start cut 4 is formed in a shape substantially along the flange portion. It is important to form the peeling start cut 4 so as not to face the opening side of the flange portion of the container.

  The easy-peelable resin layer 31 includes a heat-adhesive resin layer 31a from the innermost layer side, a core layer 31b made of a resin containing a resin having a melting point higher than that of the resin constituting the heat-adhesive resin layer 31a, and a laminate resin layer 31c. The three-layer structure is laminated in this order. The heat-adhesive resin layer 31a, which is the innermost layer, is made of a resin having a low melting point of less than 105 ° C. and can be easily bonded to the flange portion of the container. The core layer 31b is a layer made of a resin having a melting point higher than that of the resin constituting the thermoadhesive resin layer 31a and containing a high melting point resin of 110 ° C. or higher. A resin having a high melting point contained in the core layer 31b preferably has a larger melting point difference than the melting point of the resin constituting the heat-adhesive resin layer 31a because the temperature range for heat-bonding the lid material to the flange portion of the container becomes wider. The adhesive strength between the thermal adhesive resin layer 31a and the core layer 31b is weaker than the thermal adhesive strength between the thermal adhesive resin layer 31a and the container, and the lid material is pulled up from the container to which the lid material A is thermally bonded. When being opened, delamination is performed between the core layer 31b and the thermoadhesive resin layer 31a. Furthermore, the thickness of the heat-adhesive resin layer 31a is as thin as 10 μm or less, more preferably 5 μm or less, and the heat-adhesive resin layer 31a is easily broken at the opening start point of the lid. ing. Further, the laminate resin layer 31c is a layer for facilitating adhesion to the adhesive resin layer 20 in the case where the intermediate layer is not laminated, and to the intermediate layer 32 in the case where the intermediate layer is laminated.

  As a laminated structure of the outer lid 10 constituting the lid member, a transparent plastic film can be laminated on the surface of the base material layer 11 as a surface layer. By laminating the surface layer, it is possible to protect the printing ink printed on the base material layer 11 and to add gloss and matte to the surface to give the lid material a high-class feeling. Further, the intermediate layer 32 can be laminated on the inner lid 30 as in the first embodiment. The laminated structure and materials used for each layer are appropriately determined according to the content protection function such as gas barrier property, moisture proof property, and puncture resistance required for the lid material, and surface physical properties such as surface gloss and friction resistance.

  Next, each layer which comprises the cover material of this invention is demonstrated. For the surface layer constituting the outer lid 10, a plastic film such as polyester, polypropylene, nylon, or polylactic acid, or a plastic film obtained by depositing an inorganic oxide such as silicon oxide or aluminum oxide on these plastic films is used. As the plastic film, a biaxially stretched film is preferable, and the thickness is usually about 9 to 40 μm.

As the base material layer 11 constituting the outer lid 10, plastic films such as polyester, polypropylene, nylon, and polylactic acid, synthetic paper such as polypropylene, polyester, and polystyrene, and paper are used. Moreover, what laminated | stacked combining any of these is used. The thickness of the plastic film is about 9 to 40 μm, and the thickness of the synthetic paper is 60 to 300 μm. When paper is used, single-sided coated paper and double-sided coated paper having excellent printability are preferable. The thickness of the paper, in the case of laminating the surface layer on the outer lid 10 is about 30 to 100 g / m ^2, when not laminated surface layer is about 50~130g / m ^2.

  Examples of the release agent for forming the release agent layer 12 include nitrified cotton-based, polyamide-based, polyester-based, acrylic-based, urethane-based, and alkyd-based resins. These may be used alone or in combination of two or more. The release agent layer 12 can be formed at a predetermined position by part coating by a processing method such as gravure printing or flexographic printing. Wax, silicon or the like can be mixed as an additive to the release agent to adjust the peel strength from the adhesive resin layer. Further, between the release agent layer 12 and the base material layer 11, for example, a sealing agent obtained by mixing, for example, nitrified cotton-based, polyester-based, acrylic-based, urethane-based, alkyd-based resins alone or in combination of two or more. It may be used to provide an undercoat layer. In particular, it is preferable when the release agent layer 12 is provided on the non-coated surface of single-side coated paper.

  Examples of the adhesive resin layer 20 for bonding the outer lid 10 and the inner lid 30 include heat such as polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ionomer, and polypropylene. A plastic resin can be used, these are hot-melt extruded, and the outer lid 10 and the inner lid 30 are laminated by extrusion lamination. Further, the adhesive resin layer 20 can be laminated by wet lamination method or dry lamination method by roll coating, gravure coating, kiss coating, etc. using an emulsion adhesive or dry laminating adhesive. preferable.

  For the intermediate layer constituting the inner lid 30, a plastic film used for the surface layer, a plastic film such as ethylene / vinyl alcohol copolymer, vinylidene chloride, polyvinyl alcohol, aluminum foil, or the like is used. The thickness is usually about 9 to 40 μm.

The easy-peeling resin layer 31 constituting the inner lid 30 needs to be particularly thin in the thickness of the heat-adhesive resin layer 31a, and is preferably manufactured by a coextrusion method. The resin used for the heat-adhesive resin layer 31a is a resin having a low melting point of less than 105 ° C., and is selected according to the type of resin of the container to which the lid member is thermally bonded. For example, polyethylene, ethylene / vinyl acetate copolymer, ethylene / (meth) acrylic acid copolymer, ethylene / (meth) acrylic acid ester copolymer, polyolefin resin such as ionomer, resin such as polystyrene, polyester, etc. These resins are used alone or as a mixture of two or more resins.
The resin used for the core layer 31b is a layer made of a resin containing a resin having a high melting point of at least 110 ° C. or higher. Examples of the high melting point resin include resins such as medium density or high density polyethylene and polypropylene. The core layer 31b must be detachably bonded to the heat-adhesive resin layer 31a. As the resin used for the core layer 31b, the resin used for the heat-adhesive resin layer 31a, the above-described high-melting resin, and acid-modified , for example, It is a mixed resin containing an adhesive resin such as polyolefin and a compatibilizer for increasing the compatibility of these resins. The laminate resin layer 31c is made of a mixed resin similar to the core layer 31b.

  Examples of the resin used for the container to which the lid material of the present invention is attached by thermal bonding include polystyrene, polypropylene, polyethylene, polyester, ethylene vinyl alcohol copolymer, and the like. These resins are used as sheets or foamed sheets, and these sheets are formed as a single body or laminated, and formed by vacuum forming, pressure forming, vacuum pressure forming, or by injection molding these resins. An injection container can be used. In addition, an injection container made of a foamed resin by mixing a foaming agent with the above resin can also be used for the injection container.

  Next, a method of forming the opening cut 3 and the peeling start cut 4 will be described. The opening notch 3 and the peeling start notch 4 formed on the inner surface of the base material layer 11 are the outer lid 10 in which the release agent layer 12 is formed on the base material layer 11, the intermediate layer 32, and the easy peel resin layer 31. After the inner lid 30 laminated with is laminated via the adhesive resin layer 20 to produce a laminate for the lid material, the inner lid 30 is formed by half-cutting from the easy peel resin layer 31 side of the inner lid 30 It is what is done.

  FIG. 3 is a cross-sectional view showing a state in which the lid A of the first embodiment of the present invention is bonded to the container opening. As shown in FIG. 3, the cover material A of the present invention is used by attaching the cover material A to the flange portion 5 of the container B provided with a flange portion at the periphery of the circular opening, and attaching the container B Is sealed with the lid A. The heat bonding portion 6 is formed in a circular shape with a predetermined width at a position inside the periphery of the lid A. When the lid A is thermally bonded to the container B and attached by the heat bonding part 6, the peeling start cut 4 is located outside the heat bonding part 6 or is located in the heat bonding part 6. May be. In addition, in FIG. 3, the example which is in the position which the notch 4 for peeling start overlaps with the flange part 5, ie, the heat bonding part 6, is shown. In the case of a conventional lid material, when the position of the peeling start cut is located in the thermal bonding part, when the lid is heat bonded to the flange part of the container, the thermal adhesive resin layer on which the peeling start cut is formed is restored. Although the effect of half-cut disappeared and no opening was formed, the present invention solves such a problem, and even if the incision for starting peeling is located in the thermal bonding part, the opening is surely made. it can.

  FIG. 4 is a cross-sectional view showing a state where the outer lid of the lid member of the first embodiment of the present invention adhered to the container opening is partially peeled. As shown in FIGS. 3 and 4, when the knob 2 of the lid A of the present invention is picked up and pulled up, the thermal adhesive resin layer 31 a of the easy peel resin layer 31 is first broken at the outer edge of the thermal adhesive part 6. Then, delamination occurs between the thermoadhesive resin layer 31a and the core layer 31b, further delamination proceeds, and when the delamination incision 4 is reached, a transition occurs between the delamination layers. The layer 12 is peeled off, and the knob portion 2 is in a state where the inner lid 30 is adhered to the outer lid 10, and the inner lid 30 and the adhesive resin layer 20 are adhered to the container B inside the separation start cut 4. In this state, the peeling progresses, and when the opening cut 3 is reached, the adhesive resin layer 20 and the inner lid 30 surrounded by the opening cut 3 are cut off in a state of being bonded to the outer lid 10. A substantially square opening 7 with rounded corners surrounded by the cut 3 is formed. Ri can be issued.

  The second embodiment of the lid according to the present invention is as shown in FIGS. As shown in FIG. 5, the lid member A ′ has a substantially rectangular shape, and includes a hot water cut hole forming knob 2 ′ a and an unsealing knob 2 ′ b that protrude outward at opposite corners of the outer peripheral edge. It is used as a lid to seal the container by heat bonding to the flange provided at the periphery of the opening of the container having a rectangular opening, and cooks instant food such as fried noodles with hot water Thus, it is preferably used for the purpose of draining hot water that has become unnecessary after cooking. The size of the lid A ′ is preferably substantially the same as or slightly larger than the outer peripheral edge of the flange portion of the container, and the shape of the lid A ′ is determined according to the shape of the outer peripheral edge of the flange portion. In addition to the quadrangular shape, the shape may be circular, elliptical, rectangular, or the like. FIG. 5A is a plan view seen from the outer surface side of the lid A ′, showing a state in which the outer lid 10 ′ is visible. The outer surface of the lid A ′ is printed on the design for sales promotion and the contents of the product (not shown). (B) of FIG. 5 is a bottom view seen from the inner surface side (the surface side thermally bonded to the container) of the lid material A ′, and shows the state where the easy peel resin layer 31 constituting the inner lid 30 is visible. Show. On the inner surface of the lid member A ', a plurality of hot water cut hole-shaped cut holes 3' are formed. The hot water cut hole cut 3 ′ can be arbitrarily formed as long as it has a closed shape, such as a circle, an ellipse, or a square, depending on the ease of hot water cutting. Further, a hot water cut hole forming notch 4 ′ that bisects the inner lid 30 is formed between the hot water cut hole forming knob 2 ′ a and the hot water cut hole cut 3 ′.

  FIG. 6 is a YY cross-sectional view of the lid member A ′ of the present invention in FIG. As shown in FIG. 6, the lid A ′ of the present invention includes an outer lid 10 ′ in which a surface layer 13 made of a transparent plastic film and a base material layer 11 are laminated via an adhesive layer 14, and an intermediate layer 32. In this configuration, the aluminum foil and the inner lid 30 in which the easy peel resin layer 31 is laminated on the innermost layer are laminated via the adhesive resin layer 20. Between the outer lid 10 ′ and the inner lid 30, an easy peeling region S provided with the release agent layer 12 and a non-peeling region N that does not have a release agent layer adjacent to the easy release region S are arranged. It is installed. The easy peeling area S is formed in a region including the cut hole forming cut 4 ′ and the cut hole forming cut 3 ′ on the side of the cut hole forming knob 2′a, and the cut hole forming knob 2′a. Is separated from the non-peeling region N at a portion connecting about ½ points on both sides adjacent to each other. The easy-peeling region S may usually be half or less of the area of the lid material A ′. In the easy-peeling region S, a closed hot water cut 3 'penetrating the inner lid 30 and the adhesive resin layer 20 from the easy peel resin layer 31 side is formed and surrounded by the hot water cut 3'. There is no release agent layer in the region, and the inner lid 30 and the outer lid 10 ′ are bonded via the adhesive resin layer 20. Although there may be a release agent layer in the region surrounded by the hot water cut hole cut 3 ′, it is preferable that there is no release agent layer because a hot water cut hole can be reliably formed in the inner lid 30. Further, the inner lid 30 is divided in half between the hot water cut hole forming knob 2′a and the hot water cut hole cut 3 ′, and the hot water penetrating the inner lid 30 and the adhesive resin layer 20 from the easy peel resin layer 31 side. A cut hole forming cut 4 'is formed. The hot cut hole forming cut 4 'is formed in a shape substantially along the flange portion. It is important to form the cut hole forming cut 4 'so as not to face the opening side of the flange portion of the container.

  The laminated structure of the lid material, the material used for each layer, and the method of forming the hot water cut hole cut 3 ′ and the hot water cut hole forming cut 4 ′ are the same as in the first embodiment, and a description thereof will be omitted.

  FIG. 7 is a cross-sectional view showing a state in which the lid A ′ according to the second embodiment of the present invention is bonded to the opening of the container. As shown in FIG. 7, the use state of the lid A ′ of the present invention is, for example, made of instant noodles such as fried noodles and plastic film in a tray-like container B ′ having a flange portion 5 at the periphery of a substantially rectangular opening. Ingredients, soup, etc. hermetically packaged in a sachet are accommodated, the cover A ′ is covered with the opening, and the cover A ′ is thermally bonded to the flange 5 and the container B ′ is attached with the cover A ′. It is sealed. The thermal bonding portion 6 is formed in a substantially square shape with a predetermined width at a position inside the periphery of the lid member A ′. When the lid A ′ is thermally bonded to the container B ′ and attached by the heat bonding part 6, the cut hole forming cut 4 ′ is located outside the heat bonding part 6 or the heat bonding part 6 It may be located inside. FIG. 7 shows an example of a state where the cut hole forming cut 4 ′ overlaps with the flange portion 5, that is, in the thermal bonding portion 6. In the case of a conventional lid material, when the position of the cut hole forming slit is located in the thermal bonding portion, when the lid material is thermally bonded to the flange portion of the container, the thermal adhesiveness in which the cut hole forming slit is formed. The resin layer was re-adhered, the effect of half-cutting disappeared, and hot-cut holes were not formed. However, the present invention solves such problems and the cut-holes for hot-cut holes are formed in the thermal bonding section. Even if it is located, the hot water cut hole can be formed reliably.

  To use the container with the lid A ′ shown in FIG. 7, first, the opening knob 2′b of the lid A ′ is picked and the lid A ′ is peeled off from the container B ′ by a predetermined distance. After partially opening the container mouth, taking out the ingredients, soup, etc. hermetically sealed in a sachet stored in the container, after putting the necessary ingredients into the container, After pouring hot water into the container B ′ from the opening to a predetermined water level, the opening is closed with the lid A ′ and the hot water is returned for a certain time. As shown in FIG. 8, in order to perform hot water cutting after the contents have been reconstituted, hot water bonding is performed by picking the hot water hole forming knob 2 ′ a of the lid A ′ and pulling it upward. At the outer edge of the part 6, first, the thermal adhesive resin layer 31a of the easy peel resin layer 31 is broken, delamination occurs between the thermal adhesive resin layer 31a and the core layer 31b, and further peeling progresses. When it reaches the cut hole forming cut 4 ′, the transition between the peeling layers occurs, the adhesive resin layer 20 and the release agent layer 12 are peeled off, and the hot cut hole forming knob 2′a is formed on the inner lid. In the state where 30 is bonded to the outer lid 10 ′, peeling progresses while the inner lid 30 and the adhesive resin layer 20 are bonded to the container B ′ inside the cut hole forming cut 4 ′. When it reaches ′, the adhesive resin layer 20 and the inner lid 30 surrounded by the hot water cut hole 3 ′ are bonded to the outer lid 10 ′. Since the cut in a state 'on the upper surface of the hot water cutting hole cuts 3' container B Yu cut holes 8 of the hot water cut shape surrounded by is plural number. Thus, the hot water in the container B ′ can be discharged from the hot water cutting hole 8 by tilting the container B ′ with the hot water cutting hole 8 facing downward. After the hot water is cut off, the opening knob 2'b is picked to peel the lid A 'from the container B'. Then, eat with the attached soup or sprinkles. In addition, when the opening knob 2'b of the lid A 'is picked and the lid A' is peeled off from the container B ', the opening knob 2'b of the lid A' is not shown. By pulling upward, the thermal adhesive resin layer 31a of the easy-peelable resin layer 31 is first broken at the outer edge of the thermal adhesive portion 6, and an interlayer is formed between the thermal adhesive resin layer 31a and the core layer 31b. When peeling occurs and further peeling progresses and reaches the inner edge of the thermal bonding portion 6, the thermal adhesive resin layer 31a is broken again, and the container B ′ and the lid A ′ are peeled off. That is, the heat-adhesive resin layer 31 a is broken along the heat-bonding portion 6, and a small piece of the broken heat-adhesive resin layer 31 a is bonded to the heat-bonding portion 6.

  Next, the present invention will be described in more detail with reference to examples.

Single-side coated paper 79.1g / m ² is used for the base layer, urethane gravure ink is used for the coated surface, and the non-coated surface is registered to the pattern, and the nitrified cotton / polyamide gravure ink is used. The release agent layer was partially printed on both sides by a gravure printing machine to prepare an outer lid sheet having a structure of <pattern printing / paper / release agent layer>. Next, aluminum foil (Al) 15 μm is used for the intermediate layer, polystyrene resin is used for the heat-adhesive resin layer as the easy-peeling resin layer, and three-layer coextrusion with a thickness of 35 μm of laminate resin layer / core layer / thermoadhesive resin layer Using a film (EP), a low-density polyethylene (PE) as an adhesive resin layer, and a thickness of 15 μm while extruding the release agent layer surface of the outer lid sheet and aluminum foil (Al) 15 μm by heat melting PE. As a sandwich lamination, a polyester-isocyanate adhesive is applied to the opposite surface of Al, an adhesive layer is formed, and the laminate resin layer surface of EP is bonded by the dry lamination method (DL), and <Al / DL / EP > comprising preparing an inner lid sheet structure at the same time <picture-printed / paper 79.1 g / m ² / release agent layer / PE15myuemu / a The sheet | seat for lid | cover materials of the structure of l15micrometer / DL / EP35micrometer> was produced. In addition, the film (Sumika Plustech Co., Ltd. make, brand name: assist MS430) of the structure which is <thermal adhesive resin layer 5micrometer / core layer 10micrometer / laminate resin layer 20> was used for EP.

  Then, a half cut that penetrates the inner lid and the adhesive resin layer from the EP surface is performed with a rotary die cutter provided with a punching die having a predetermined opening cut and a peeling start cut for winding the lid sheet, and the predetermined opening A cut for cutting and a cut for starting peeling were formed. Thereafter, the cover material A shown in FIG.

  The lid A prepared above was thermally bonded to the flange portion of a cup-shaped injection container made of expanded polystyrene, and the container was sealed. Regarding the positional relationship between the separation start cut and the thermal bonding portion 6, the state in which the separation start cut is in the thermal bonding portion 6 (sample A) and the state at the same position as the outer edge of the thermal bonding portion 6 (sample B) ) And a state (sample C) located slightly outside the outer edge of the thermal bonding portion 6 to produce three types of samples A, B, and C. Thereafter, the lid material was pulled up from the knob for each sample, peeled from the container, and the openability was evaluated. The evaluation criteria for openability was that the outer lid peeled off between the release agent layer and the adhesive resin layer from the cut for starting peeling, and an opening could be formed in the adhesive resin layer adhered to the container and the inner lid. Things were judged good.

  As a result of evaluating the unsealing property, the unsealing property was good for all of Sample A, Sample B, and Sample C. Regarding the opening start point, Samples B and C were peeling start cuts. The opening start point of sample A is the outer edge of the thermal bonding part 6, the thermal adhesive resin layer breaks at the opening start point, peels between the layers of the thermal adhesive resin layer and the core layer, The peeling reached.

Single-side coated paper 79.1g / m ² is used for the base layer, urethane gravure ink is used for the coated surface, and the non-coated surface is registered to the pattern, and the nitrified cotton / polyamide gravure ink is used. The release agent layer was partially formed by double-sided printing using a gravure printer. Next, using a biaxially stretched polyethylene terephthalate film (PET) with a single-sided corona treatment having a thickness of 12 μm as a surface layer, a polyester-isocyanate adhesive is applied to the corona-treated surface to form an adhesive layer. An outer cover sheet having a configuration of <PET / DL / pattern printing / paper / release agent layer> was prepared by laminating the pattern surface of the coated paper with a dry lamination method (DL). Next, for the intermediate layer and the easy peel resin layer, the same material having the same thickness as in Example 1 is used, and the release resin layer surface of the outer lid sheet is formed by an extrusion method using low density polyethylene (PE) for the adhesive resin layer. And aluminum foil (Al) 15 μm sandwiched with PE melted to a thickness of 15 μm, a polyester-isocyanate adhesive was applied to the opposite side of Al, an adhesive layer was formed, and the laminate resin layer surface of EP Are laminated by the dry lamination method (DL) to produce an inner lid sheet having a configuration of <Al / DL / EP> and simultaneously <PET 12 μm / DL / pattern printing / paper 79.1 g / m ² / release agent layer / PE 15 μm A sheet for lid material with a hot water hole having a configuration of / Al15 μm / DL / EP35 μm> was produced.

  Then, the inner lid and the adhesive resin layer are penetrated from the EP surface with a rotary die cutter provided with a punching die having a predetermined hot water cut hole cut and a hot water cut hole forming cut for winding the hot water cut hole cover sheet. Half cut was performed to form predetermined hot water cut hole cuts and hot water cut hole forming cuts. Thereafter, cutting and punching were performed to produce a lid material A 'with a hot water cut hole shown in FIG.

  A rectangular tray-shaped molded container made of polystyrene foam was used for the container, and the lid A ′ produced above was thermally bonded to the flange portion of the molded container to seal the container. Regarding the positional relationship between the hot-cut hole forming cut and the thermal bonding portion 6, the state in which the hot-cut hole forming cut is in the thermal bonding portion 6 (sample D) and the outer edge of the thermal bonding portion 6 are almost the same position. Three types of samples D, E, and F were manufactured by thermal bonding in a state (sample E) and a state (sample F) located slightly outside the outer edge of the thermal bonding portion 6. Thereafter, the lid material was pulled up from the knob for forming a hot water hole for each sample, peeled off from the container, and the openability was evaluated. The evaluation standard for openability is that the outer lid peels off between the release agent layer and the adhesive resin layer from the cut for forming the hot water cut hole, and a hot water cut hole is formed in the adhesive resin layer bonded to the container and the inner lid. Those that could be judged as good.

  As a result of evaluating the openability, the openability was good for all of Sample D, Sample E, and Sample F. Regarding the opening start point, Samples E and F were cuts for hot water cut hole formation. The opening start point of sample D is the outer edge of the thermal bonding portion 6, the thermal adhesive resin layer breaks at the opening start point, peels off between the thermal adhesive resin layer and the core layer, and forms a hot water cut hole The peeling reached the cut line.

2 Knob part 2'a Hot-cut hole forming knob 2'b Unsealing knob part 3 Opening cut 3 'Hot-cut hole cut 4 Separation start cut 4' Hot-cut hole forming cut 5 Flange part 6 Thermal bonding part 7 Opening 8 Hot water cutting hole 10, 10 'Outer lid 11 Base layer 12 Release agent layer 13 Surface layer 14 Adhesive layer 20 Adhesive resin layer 30 Inner lid 31 Easy peel resin layer 31a Thermal adhesive resin layer 31b Core layer 31c Laminate resin layer 32 Intermediate layer A, A 'Lid B, B' Container S Easy peeling area N Non-peeling area

Claims (2)

The outer lid having at least a base material layer and the inner lid having at least an inner peelable resin layer at the innermost layer are laminated via an adhesive resin layer and are provided with a knob that protrudes outward at the outer peripheral edge, and has an opening. A lid that seals the container by thermally bonding to the flange part of the container provided with a flange part on the periphery of the part,
An easily peelable region provided with a release agent layer between the outer lid and the inner lid; and a non-peelable region disposed adjacent to the easily peelable region,
In the easily peelable region, an opening notch having a closed shape penetrating the inner lid and the adhesive resin layer from the easy peel resin layer side is formed,
The inner lid is divided in half between the knob and the opening cut, and a peeling start notch penetrating the inner lid and the adhesive resin layer from the easy peel resin layer side is formed,
The easy-peelable resin layer is laminated at least from the innermost layer side with a heat-adhesive resin layer and a core layer made of a resin containing a resin having a melting point higher than that of the resin of the heat-adhesive resin layer, The core layer is laminated in a peelable manner ,
After the lid material is thermally bonded to the flange portion of the container and the container is sealed, when the knob portion of the lid material is picked and pulled up, the thermal adhesion of the easy peel resin layer at the outer edge of the thermal bonding portion The lid material is characterized in that the adhesive resin layer is broken, and further, delamination occurs between the thermal adhesive resin layer and the core layer, and opening is started . An opening knob and hot water in which an outer lid having at least a base material layer and an inner lid having an easy-peelable resin layer at least on the innermost layer are laminated via an adhesive resin layer and project outwardly at positions facing the outer peripheral edge It is a lid that seals the container by thermally bonding to the flange portion of the container having a flange portion provided at the periphery of the opening, comprising a structure having a cut hole forming knob.
An easy peeling region provided with a release agent layer between the outer lid and the inner lid from the hot water cut hole forming knob side toward the opening knob portion side, and adjacent to the easy peeling region. A non-peeling region provided,
In the easily peelable region, a plurality of hot water cut-off hole cuts penetrating the inner lid and the adhesive resin layer from the easy peel resin layer side are formed,
There is a cut hole forming cut that bisects the inner lid between the cut hole forming knob and the cut hole cut and penetrates the inner cover and the adhesive resin layer from the easy peel resin layer side. Formed,
The easy-peelable resin layer is laminated at least from the innermost layer side with a heat-adhesive resin layer and a core layer made of a resin containing a resin having a melting point higher than that of the resin of the heat-adhesive resin layer, The core layer is laminated in a peelable manner ,
After the lid material is thermally bonded to the flange portion of the container and the container is sealed, the easy peel resin is formed at the outer edge of the thermal bonding portion when the hot water hole forming knob portion of the lid material is picked up and pulled. A lid material in which the heat-adhesive resin layer of the layer is broken, delamination occurs between the heat-adhesive resin layer and the core layer, and opening is started .

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