JP2013023238A - Lid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily producible lid material in which a base material of a hot water draining section is strengthened not to cause unexpected breakage because such breakage can cause inconvenience in draining water or separating.SOLUTION: The lid material is a laminated sheet for welding and sealing the peripheral edge of a container to be covered. The material includes a front face material including at least a paper layer 31 and a seal base material having a lamination structure not including a stretched plastic film and at least whose innermost layer formed of a sealant layer 41. The lamination structure of the base material has a core resin layer 42 including a cyclic olefin-based polymer.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a container that stores and seals contents, and in particular, is used for instant foods and the like to be eaten after putting liquid such as water or hot water inside and discharging hot water or water to the outside during use. It relates to a container lid.

  2. Description of the Related Art Conventionally, instant food containers have been known as containers having a structure in which articles are usually sealed and stored, and liquids such as water and hot water, which are contained inside during use, are discharged to the outside through discharge holes. Examples of instant foods that require such containers include fried noodles and spaghetti. When eating these instant foods, it is necessary to pour hot water and quickly drain the hot water from the container after a predetermined time period for making the instant foods edible.

  Various forms have been proposed for containers used for instant foods. For example, the main body of the container is molded from a foamed polystyrene resin (PS) molded container, a polypropylene resin (PP) molded container, or a laminated material in which a polystyrene resin (PS) sheet and a polyethylene terephthalate resin (PET) sheet are laminated. Molded containers are commonly used. This container body contains noodles, utensils, sauces, etc., is fitted with a plastic molding lid with cuts to form hot water cut holes and sealed, and the whole is shrink-wrapped with a shrink film Is commonly used.

  However, in the case of the packaging form having the above-described configuration, the sealing performance is inferior because the plastic molding lid is formed with a cut serving as a hot water cut hole. Moreover, since the number of hot water cutting holes is limited, it takes two hours of hot water cutting. Since it is a fitting lid, the lid is removed from the container when the hot water is drained. Or there was a problem that hot water leaked out from the gap between the lid and the container and could cause burns.

  Therefore, for example, as disclosed in Patent Document 1, a laminated sheet type lid material that is hermetically sealed to the container body has been developed in place of the plastic molding lid described above. The lid member is composed of an upper sheet called a top sheet and a lower sheet made of a composite layer as a lower layer, and is sealed by heat-sealing in an detachable (easy peel) manner at the edge of the opening of the container body. An easy release layer is formed by applying an easy release agent in a part of the area between the upper sheet and the lower sheet, and the lid member has an easy release area in which the easy release layer is formed in plan view. It is divided into non-bonding (non-peeling) regions. A perforation is formed in the upper sheet at a predetermined position close to the adhesion area of the easy peelable layer area. In the easy peeling area of the lower sheet, a plurality of hot water cut holes by cutting are provided so as to penetrate the front and back. Moreover, a hot water draining pull tab is extended from a part of the end of the easy peeling region of the upper sheet so as to protrude outward. On the other hand, an opening pull tab used to peel off the lid from the container body is extended in a part of the adhesion region so as to protrude outward.

By covering the container with the lid material with the above configuration and packaging the contents, it is excellent in sealing performance, can be quickly drained with simple operation, and can be steamed for a predetermined time without leaking hot water It is. At the time of eating, the user lifts the opening pull tab, partially opens the lid, and pours hot water into the container body. Thereafter, the pull tab for opening is closed and locked so as to be bent at the edge of the container main body, and waits for the cooking time by heating the hot water. Thereafter, the pulling tab for hot water cutting is pulled up from the lower sheet, the easy peeling area of the lower sheet is opened, and a predetermined portion of the pulled easy peeling area is cut from the perforation. Thereby, a plurality of hot water cutting holes appear in the easy peeling region of the lower sheet. Therefore, the container is tilted to discharge the hot water after cooking from the hot water hole. When the hot water draining is finished, the pull tab for opening is pulled up again, and the lid is separated from the container main body, so that eating is possible.

JP 2000-203653 A

  However, such a conventional lid has a problem that the strength of the lower sheet is insufficient and the sheet is easily broken. For example, when the upper sheet is peeled off to reveal a hot water hole, the lower sheet breaks due to the hot water hole, or the portion between the hot water holes breaks due to the weight of the contents when the hot water is discharged, and the hole diameter increases. There was a case where food was leaked. In addition, when the hot water drainage part is pulled and removed from the container at the time of eating, the lower sheet breaks, and the lower sheet sealed with the container remains on the edge of the opening of the container main body, thereby hindering eating. There was a thing.

  In order to reinforce the strength of the lower sheet, it may be possible to laminate a stretched film such as polyethylene terephthalate (PET) in the composite layer, but the deadfold (DF) property is lowered and the opening retention property is lost, and hot water is used. There is a risk of closing when pouring.

  In this connection, the applicant of the present application disclosed in Japanese Patent Application No. 2010-077136, which is a laminated sheet type lid material having the same configuration as that of Patent Document 1, and the lower sheet is laminated by melt resin extrusion lamination using a T-die. The present invention proposes and invents a lid material that includes an anti-breaking resin layer, wherein the anti-breaking resin layer is an amorphous polyethylene terephthalate resin layer or an ethylene-vinyl alcohol copolymer layer. Since this technique requires strict control of the film forming conditions in production, there are further improvements such as that it takes a little time to adjust the conditions at the time of product changeover.

  The present invention was made in view of the above-mentioned conventional problems, strengthening the base material strength of the hot water cutting part, without causing inadvertent base material breakage that hinders hot water cutting work and peeling work, In addition, it is an object to provide a lid material that is easy to manufacture.

  The invention according to claim 1 of the present invention is a laminated sheet-like lid member that welds and seals the peripheral edge portion of an adherend container, and is a laminated structure in which a surface material including at least a paper layer, and at least an innermost layer includes a sealant layer. The lid material having a sealing base material, wherein the sealing base material has a resin layer containing a cyclic olefin polymer in the laminated configuration of the sealing base material.

Further, the invention according to claim 2 of the present invention is such that the peel strength (= seal strength) between the container and the lid material at the seal portion at the peripheral edge of the adherend container is 5 N / 15 mm or more and 15 N / 15 mm or less, and The lid material according to claim 1, wherein the sealing substrate has a breaking strength of 20 N / 15 mm or more.
Here, the peel strength is a value measured by a method based on “7.5 heat seal strength” of JIS Z1707, the test speed is 500 mm ± 50 mm per minute, and the peel is a T-type peel. The breaking strength is a value measured by a method according to JIS K7127, and the test speed is 500 mm ± 50 mm per minute.

In the invention according to claim 3 of the present invention, the surface material and the sealing base material are partitioned into an easily peelable region and an adhesive region in which the surface material and the seal base material are laminated so as to be peeled through an easily peelable layer in a predetermined shape region. A plurality of annular half cuts that penetrate the seal substrate and reach the lower part of the surface material are provided in a part of the seal substrate in the peelable region, 3. The lid material according to claim 1, wherein a plurality of hot water cut-out holes are caused to appear in the seal base material by peeling off a part of the surface material covering the shape region.

  The invention according to claim 4 of the present invention is characterized in that the sealing base material includes a layer configuration of polyethylene / aluminum foil / resin layer / sealant layer in order from the side in contact with the surface material. It is a lid | cover material described in any one of 1-3.

  In the invention according to claim 5 of the present invention, the resin layer constituting the sealing base material is composed of a mixed resin layer of cycloolefin copolymer (COC) and linear low density polyethylene (LLDPE). It is a lid | cover material as described in any one of Claims 1-4 characterized by the above-mentioned.

  The lid material of the present invention is composed of a surface material including at least a paper layer, and a seal base material in which an innermost layer is a sealant layer, and is a cover material having a laminated structure not including a stretched plastic film. By having a resin layer containing a cyclic olefin polymer in the structure, the sealing substrate strength is improved, and the lid material can be peeled and removed from the container without causing inadvertent peeling, so it is excellent in handleability. Is.

  In addition, when the lid material of the present invention is applied to instant foods that require hot water cutting operation, the base material strength of the hot water cutting portion is strengthened, and the careless base material that interferes with hot water cutting work or peeling work There is no breakage. In particular, in the cover material of the configuration in which the resin layer containing the cyclic olefin polymer in the sealing base material is formed on the inner side layer of paper and aluminum foil, when removing the hot water drainage portion from the container, A low-strength paper or aluminum foil is supported from the inside of the container by a resin layer containing a strong cyclic olefin polymer, and the sealing substrate is removed together with the surface material. Thereby, layers, such as paper and aluminum foil, fracture | rupture or surface layer destruction, and possibility that it will remain in a container can be made low.

  Further, as a resin layer constituting the sealing base material of the lid material of the present invention, by using a mixed resin of cycloolefin copolymer (COC) and linear low density polyethylene (LLDPE), extrusion workability, film formation It is possible to produce a stable lid material by a method with high productivity.

It is explanatory drawing which shows one embodiment of the lid | cover material of this invention in a plane. It is the schematic diagram which showed the cover material shown in FIG. 1, and the deposition container in the cross section. It is sectional drawing which expanded the place enclosed with the dashed-dotted line in FIG. 2 typically.

  Hereinafter, the present invention will be described based on an embodiment. In addition, although the following description is given about the embodiment applied especially to the hot water lid member, the technique of the lid material of the present invention is not limited to the hot water lid material.

  FIG. 1 is a plan view of one surface of a lid material according to an embodiment of the lid material of the present invention. FIG. 2 is a schematic cross-sectional view of the lid member and deposition container shown in FIG. The lid member is sealed at the periphery of the opening of the deposition container, and seals the deposition container. Further, the lid member is formed of a laminated body including a sealing base material sealed to the deposition container and a surface material that is peelably laminated with the sealing base material. FIG. 3 is an enlarged cross-sectional view schematically enlarging a portion surrounded by an alternate long and short dash line in FIG.

  As shown in FIG. 2, the lid material 10 of the present invention is a laminated sheet-like lid material that welds and seals the peripheral edge of the deposition container 20 to be deposited, and includes a surface material 30 including at least a paper layer 31, and At least the innermost layer has a seal substrate 40 made of a sealant layer 41. And as shown in FIG. 3, it has the resin layer 42 containing a cyclic olefin type polymer in the laminated structure of the sealing base material 40, It is characterized by the above-mentioned. In addition, in the lid | cover material 10 of this invention, a stretched plastic film is not included in the laminated structure of the sealing base material 40. FIG.

  FIG. 1 shows a plan view of one surface of an example in which the lid member of the present invention is applied to a hot water lid member. As shown in FIG. 1 and FIG. 2, the lid member 10 of the present invention has an easily peelable region in which a surface material 30 and a seal substrate 40 are laminated in a predetermined shape region so as to be peelable via an easily peelable layer 33. 50 and a bonding region 60 are laminated and bonded to each other. An opening tab 61 is provided in one place of the adhesion region 60 on the side far from the easy peeling region 50 at the peripheral edge of the lid member 10. The opening tab 61 is not formed with a half cut, and the force applied to the opening tab 61 is also transmitted to the sealing base material 40, so that the lid 10 is sealed by pinching the opening tab 61. The substrate 40 can be peeled off from the deposition container 20 and opened. Further, a peeling half-cut 71 is applied to the paper layer 31 included in the surface material 30 on the easy-peeling region 50 close to the boundary line between the easy-peeling region 50 and the adhesive region 60. Instead of the peeling half cut, a peeling perforation may be formed on the paper layer included in the surface material.

  Further, an annular half cut for a hot water cut hole that penetrates the sealing base material 40 and reaches the lower part of the surface material 30 in a part of the easy peeling region 50 on the opposite side of the opening tab 61 across the peeling half cut 71. A plurality of 72 are provided, a hot water cut hole half-cut 72 is formed from the seal base side of the lid member 10, and a peeling tab 51 is provided on the peripheral edge thereof. The peeling tab 51 is provided at a position close to the peeling half cut 71. A peeling start half cut 73 for cutting the sealing base material is formed at the connecting portion between the peeling tab 51 and the lid member 10. By peeling a part of the surface material 30 covering the sealing base material 40 in the easy peeling region 50 of the lid member 10, a plurality of hot water cutting holes 70 can appear in the sealing base material 40.

  Next, a layer configuration example in which the lid material of the present invention is applied to a hot water lid material will be described with reference to FIG. The surface material 30 of the lid member 10 has a layer structure of a printing layer 32 / paper layer 31 / easy peeling layer 33 from the outer side to the inside of the deposition container 20, and the easy peeling layer. Reference numeral 33 denotes a layer structure of a sealing varnish layer 34 / a release varnish layer 35. Further, the sealing base material 40 of the lid member 10 has a layer structure of polyethylene 44 / aluminum foil 43 / resin layer 42 / sealant layer 41 from the side in contact with the surface material 30 toward the inner side of the deposition container 20. The resin layer 42 contains a cyclic olefin polymer.

The paper constituting the paper layer, basis weight 79.4g ^{/ m 2} ~127.9g ^/ m 2 about one-sided art paper or single-sided coated paper, quality paper, or the like. Further, the surface of the paper is usually subjected to printing necessary as a final product, protective varnish, or the like.

  For the release varnish layer constituting the easy release layer, for example, a wax-based, polyamide-based, silicon-based, acrylic-based resin-based one is preferably used. In order to prevent impregnation of the release varnish into the paper, a sealing varnish layer is provided between the release varnish layer and the paper layer. As the sealing varnish, for example, nitrified cotton, urethane, wax, polyamide, silicon, and acrylic resin are preferably used.

Examples of the polyolefin-based adhesive resin for bonding and laminating the surface material and the seal substrate include a low density polyethylene (LDPE) resin, a high density polyethylene (HDPE) resin, a linear low density polyethylene (LLDPE) resin, Polyolefin resins such as polypropylene (PP) resin and polyolefin elastomer can be used. In view of processing and cost, LDPE is preferably used for general purposes.

  When an aluminum foil is used in the laminated structure of the seal substrate, gas barrier properties and light shielding properties can be imparted. Especially when soft aluminum foil is used, the elastic repulsion force generated in the direction of separation from the surface material to the sealing base material inside the hot water hole half cut is reduced when the surface material of the hot water hole is peeled off. To do. Moreover, in addition to providing opening retention required when opening the pouring port, the deadfold property when the sealed portion is resealed after being once opened and poured with hot water is improved. In this case, if the thickness of the aluminum foil is less than 5 μm, it is difficult to handle in processing, and the deadfold property is inferior. Further, if the thickness exceeds 15 μm, the thickness of the aluminum foil is preferably 5 μm or more and 15 μm or less because it is not preferable because it is too stiff and is economically inferior.

  As the sealant layer for welding and sealing the peripheral part of the lid material and the deposition container, polyolefin resin is generally used, specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, Ethylene resins such as ethylene-vinyl acetate copolymer, ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, homopolypropylene, propylene-ethylene random copolymer Polypropylene resins such as propylene-ethylene block copolymers and propylene-α olefin copolymers are used. The sealant layer may be a single layer of the above material, but when an expensive easy peel sealant is used, it may be co-extruded with an adhesive resin in order to make the sealant layer thin.

  Next, the cyclic olefin polymer mixed resin layer which becomes the resin layer in the laminated structure of the seal substrate will be described. Cyclic olefin polymers include cycloolefin copolymers (COC) which are addition polymers with α-olefins and cycloolefin polymers ((COP) which are ring-opened polymers of cyclic olefins. The coalescence is an amorphous resin having a cyclic olefin structure, unlike a crystalline polyolefin represented by ordinary polyethylene (PE) and polypropylene (PP), and has a glass transition point Tg as high as 100 ° C. or higher. Many of them have good heat resistance even with Tg of 100 ° C or less, and strong physical properties such as tensile strength and bending strength, etc. For example, when applied to a hot water lid, strength at high temperature when steamed with hot water It has an excellent anti-breaking function when added to the resin layer in the laminated structure of the seal substrate. Since film formation and lamination are possible, the process of laminating a stretched film substrate in a separate process is not required, and co-extrusion with a polyolefin adhesive layer or sealant layer is possible. Is good, but the material cost is high, and COC is better as the material hardness.

  As a resin layer, COC is inferior in film forming suitability by itself, but especially by utilizing its good compatibility with LLDPE, film forming suitability can be greatly improved by mixing extrusion with LLDPE. . Therefore, the cyclic olefin polymer mixed resin layer is preferably a mixed resin of COC and LLDPE from the viewpoint of improving the strength of the base material, cost, and film forming suitability. Further, the resin mixing ratio is not particularly limited, but when COC is added in an amount of 20% by mass or more, improvement in waist strength is expected. When COC is added in an amount of 80% by mass or more, the flow characteristics are almost the same as those of a single resin of COC, and the cost increases. Therefore, in order to achieve both improvement in waist strength and suitability for film formation, the mixing ratio of COC is 20% by mass. More than 80% by mass is preferable.

  In addition, although it is set as the structure containing an aluminum foil layer in this embodiment example, the dead hold property improvement effect in an aluminum-less structure can be provided using the hardness of the waist strength of a cyclic olefin system polymer mixed resin layer. it can.

  With the lid member having the laminated structure described above, the peripheral edge portion of the deposition container is welded and sealed by a known method. The main body of the deposition container is formed of a foamed polystyrene resin (PS) molded container, a polypropylene resin (PP) molded container, or a laminated material in which a polystyrene resin (PS) sheet and a polyethylene terephthalate resin (PET) sheet are laminated. Select the sealant material that can be easily peeled. In the lid material of the present invention, it is desirable that the peel strength (= seal strength) between the deposition container and the lid material at the seal portion at the peripheral edge of the deposition container is 5 N / 15 mm or more and 15 N / 15 mm or less. If it is less than 5 N / 15 mm, peeling may occur under packaging and physical distribution conditions in which the contents are put. Moreover, when it exceeds 15 N / 15 mm, opening is difficult. Further, the breaking strength of the sealing base material needs to be 20 N / 15 mm or more corresponding to the above-described peel strength (= seal strength). By satisfying the above-mentioned strength conditions, when the entire lid material is peeled off from the adherend container after hot water is cut off, the sealing base material including the sealing base material in the easy peeling region portion in which the hot water hole is formed, It is removed together with the surface material. Thereby, layers, such as paper and aluminum foil, fracture | rupture or surface layer destruction, and possibility that it will remain in a deposition container can be made low. Here, the peel strength is a value measured by a method based on “7.5 heat seal strength” of JIS Z1707, the test speed is 500 mm ± 50 mm per minute, and the peel is a T-type peel. The breaking strength is a value measured by a method according to JIS K7127, and the test speed is 500 mm ± 50 mm per minute.

  Below, the specific Example and comparative example of the cover material of this invention are demonstrated.

<Example 1>
Using a gravure printing machine on the back of a single-sided art paper with a basis weight of 104.7 / m ^2, a sealing coating agent is used with a 40μ version of the Porschel plate, and a release varnish agent is used with the Helio plate 70L. Each coating agent was applied and laminated on each of the easily peelable regions in a shape in which the single-sided cover material shown was multifaceted. On the surface of single-sided art paper, a normal gravure ink was printed to obtain a gravure printed material constituting the surface material. Next, a melted low-density polyethylene resin (LDPE) was extruded to a thickness of 20 μm on the back surface of the gravure print obtained above, and bonded to an aluminum foil of 7 μm to obtain a laminate. Further, an AC agent was applied to the aluminum foil surface of the laminate to obtain a laminate obtained by extruding a mixed layer of a cyclic polyolefin polymer and LLDPE of 15 μm and a sealant resin layer of 10 μm, and the lid material of Example 1 was obtained. It was.

<Examples 2-7, Comparative Examples 1-4>
Using the same surface material as in Example 1, Examples 2 to 7 having a resin layer containing a cyclic olefin polymer in the laminated structure shown in Table 1 and Comparative Examples 1 to 4 having no resin layer Laminated bodies having a seal base material structure were obtained, and respective lid materials were prepared. Examples 6 and 7 and Comparative Example 4 have a configuration in which no aluminum foil is used, and Comparative Example 1 has a configuration in which a PET film is used. The materials used are described below.
Single-sided art paper: “Gravure Art” (Oji Paper Co., Ltd.) 104.7 g / m ²
Pattern ink: "Eco Color F" (Toyo Ink Manufacturing Co., Ltd.)
Sealing agent: Sealing varnish “P1264” (manufactured by Toyo Ink Co., Ltd.)
Release agent: Peeling varnish “PB703” (manufactured by Toyo Ink Manufacturing Co., Ltd.)
LDPE: “L2340E” (Sumitomo Chemical Co., Ltd.) 20 μm
AL foil: Soft aluminum (Sumitomo Aluminum) 7μm
AC agent: “A3210” (Mitsui Chemicals)
COC: “TOPAS 8007F-500” (manufactured by Polyplastics)
LLDPE: "Kernel KC570S" (manufactured by Nippon Polyethylene)
Easy peel (EP) sealant resin layer: “VN503” (Mitsui DuPont) 10 μm
EMAA: "Nucleel N0908C" (Mitsui DuPont)

上記積層体をイズミ産業社製ロータリーダイカッターを用いて、第１ユニットにてシーラント面から易剥離層までの深さのハーフカットで湯切孔を、第２ユニットにて紙面から易剥離層までの深さのハーフカットで剥離予備線を、更に製品外周縁の抜き加工を行ない、実施例１〜７及び比較例１〜４の蓋材製品を得た。

Using the rotary die cutter manufactured by Izumi Sangyo Co., Ltd., the above laminate is cut in half by a half cut from the sealant surface to the easy peeling layer in the first unit, and from the paper surface to the easy peeling layer in the second unit. The preliminary cut line was cut with a half cut of a depth of, and the outer peripheral edge of the product was further punched to obtain the lid product of Examples 1 to 7 and Comparative Examples 1 to 4.

  Each lid product was sealed in a foamed PS container under conditions of 135 ° C., 0.5 seconds, and 0.4 MPa, and then the seal strength was measured. Using “7.5 heat seal strength” of JIS Z-1707 as an evaluation method, the lid and the sealing part of the adherence container were sampled into strips of 15 mm width, and the T-shape was peeled from the inside of the adherence container (Maximum strength of speed: 500 mm / min.) Was adopted. As a result, all the lid materials of Examples 1 to 7 and Comparative Examples 1 to 4 had a value of 12 N / 15 mm. The values are shown in Table 2.

  Next, the surface material was peeled off at the peeling varnish application portion of each lid material product, and the breaking strength of the sealing base material portion up to the sealant layer below it was measured. Using JIS K-7127 as an evaluation method, the lower material was sampled into a strip shape having a width of 15 mm, and the maximum strength at the time of tensile fracture (grasping speed: 500 mm / min.) Was adopted. The values are shown in Table 2.

[Peelability evaluation]
Each of the above-mentioned lid material products was sealed at 135 ° C. × 0.5 MPa × 0.55 sec in an adherend container (foamed PS cup) containing the contents to obtain a filled sample. First, the opening tab is rolled up, the lid material is peeled off from the deposition container together with the base material, and partially opened. And after pouring to the marked line, the open part of a cover material is suppressed, it suppresses that a heat | fever escapes from an opening, and a hot water process is carried out for the predetermined time. Next, the surface material in the opening area is peeled from the peeling tab along the peeling preliminary line to expose the hot water cutting hole, and after removing the hot water from the hot water cutting hole, the entire lid material is removed from the deposition container. Went. The results are shown in Table 2. In Table 2, the resin layer deposition suitability and deadfold (DF) properties are also shown.
The peelability was determined by visual inspection of the following state as the appearance of the adherend container after peeling.
○: Can be peeled off without causing defects such as paper breakage and aluminum breakage at the periphery of the adherend container ×: Inadequate peeling due to paper breakage, aluminum breakage, etc.

以上、説明したように、本発明の蓋材は、シール基材の積層構成中に環状オレフィン系重合体を含む樹脂層を有することで、シール基材強度が改善され、不用意な剥離を生じることなく、蓋材を被着容器から剥離除去でき、取り扱い性に優れていることがわかった。

As described above, the lid material of the present invention has the resin layer containing the cyclic olefin polymer in the laminated structure of the seal base material, thereby improving the strength of the seal base material and causing inadvertent peeling. Thus, it was found that the lid material can be peeled and removed from the deposition container and is excellent in handleability.

10 .. Lid material 20 .... Adhering container 30 ... Surface material 31 ... Paper layer
32..Print layer 33..Easily peelable layer 34..Sealing varnish layer 35..Peeling varnish layer 40..Seal base material 41..Sealant layer 42..Resin layer 43..Aluminum foil 44..Polyethylene 50・ ・ Easy peeling area 51 ・ ・ Peeling tab
60 ・ ・ Adhesion area 61 ・ ・ Tab for opening 62 ・ ・ Half cut for peeling
70..Hot-cut hole 71..Peeling half-cut 72..Hot-cut hole half-cut 73.

Claims (5)

  A laminated sheet-like lid material that welds and seals the peripheral edge of an adherend container, the lid material having a surface material including at least a paper layer, and a sealing base material having a laminated configuration in which at least the innermost layer is a sealant layer A lid member having a resin layer containing a cyclic olefin polymer in the laminated structure of the seal substrate. The peel strength (= seal strength) between the container and the lid material at the seal portion at the peripheral edge of the adherend container is 5 N / 15 mm or more and 15 N / 15 mm or less, and the breaking strength of the seal substrate is 20 N / 15 mm or more. The lid material according to claim 1, wherein:
Here, the peel strength is a value measured by a method based on “7.5 heat seal strength” of JIS Z1707, the test speed is 500 mm ± 50 mm per minute, and the peel is a T-type peel. The breaking strength is a value measured by a method according to JIS K7127, and the test speed is 500 mm ± 50 mm per minute.   The surface material and the sealing base material are partitioned into an easily peelable region and an adhesive region that are laminated so as to be peelable through an easily peelable layer in a predetermined shape region, and are laminated and adhered to each other. A plurality of annular half cuts that penetrate the seal base material and reach the lower portion of the surface material are provided in a part of the seal base material, and part of the surface material that covers the predetermined shape region of the seal base material is peeled off The lid member according to claim 1, wherein a plurality of hot water cut-out holes are caused to appear in the seal base material.   The said sealing base material contains the layer structure of polyethylene / aluminum foil / resin layer / sealant layer in an order from the side which contact | connects the said surface material, The cover material of any one of Claims 1-3 characterized by the above-mentioned. .   The said resin layer which comprises the said sealing base material consists of a mixed resin layer of a cycloolefin copolymer (COC) and a linear low density polyethylene (LLDPE), The any one of Claims 1-4 characterized by the above-mentioned. The lid material described in 1.

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