JP2016147454A - Laminated film for sealing lid material with open easiness, and container with open easiness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated film for sealing a lid material with open easiness which is excellent in sealing and open easiness, and a container with open easiness.SOLUTION: The laminated film for sealing a lid material with open easiness, one surface of which constitutes a face for heat-bonding to a metal container and the other surface of which constitutes a face for bonding to a lid material has an easily pealing face inside having a delamination strength lower than a heat-bonding strength of the face for heat-bonding and a bonding strength of the face for bonding. An opening peripheral part of the container is sealed with a lid material via a sealing layer. The sealing layer is constituted by a laminated film having an easily pealing face having a delamination strength lower than a heat-bonding strength to an opening peripheral part of the container and a bonding strength to a lid material. A position of a peel beginning part by the easily peeling face in the sealing layer of a first bonding region of the laminated film bonded to the lid material in a surface direction of the laminated film is located on a position apart from an edge apart of a second bonding region of the laminated film heat-bonded to the opening peripheral part of the container.SELECTED DRAWING: Figure 1

Description

  The present invention is used for a lid material part of a packaging container such as a food product, and has an excellent sealing property, and when opening is required, an easily openable laminated film for lid material sealing that can be easily opened with a low peel force; The present invention relates to an easy-open container using such a laminated film.

  Conventionally, for example, in food packaging containers for storage at room temperature, boil, retort, etc., and in the opening parts of various beverage containers, good sealing and easy opening at the time of storage of food and beverages and heat treatment A technique is known in which a multilayer film or a multilayer structure having sealing properties and easy peelability is interposed between a container and a lid for the purpose of opening (for example, Patent Documents 1 and 2).

  However, it is not easy to effectively achieve both the high sealing strength between the container and the lid material and the excellent easy-opening property at the time of opening, which are directions opposite to each other as to give strength. Technology is still inadequate. In particular, when the container is made of metal, it is difficult to obtain a high bonding strength for bonding a multilayer film interposed between the container and the container to the container side by thermal bonding or the like. The problem remains that the lamination strength inside the film is increased, and the easy-openability to be obtained by utilizing delamination is often impaired.

JP 2001-310431 A JP-A-7-32555

  Therefore, the object of the present invention is to pay attention to the problems in the prior art as described above, and even when the container is made of metal, a high bonding strength is obtained between the container and excellent sealing performance (seal Easily openable, and at the same time, an easy-open laminate film for lid sealing that can be easily opened at the time of opening, and sealability and easy-openability using such a laminate film It is in providing an easily openable container excellent in the above.

  In order to solve the above-described problems, the easy-open laminated film for sealing a lid material according to the present invention is configured such that one surface is a surface for thermal bonding with a metal container and the other surface is a surface for bonding with the lid material. The laminated film is characterized in that it has an easily peelable surface having a delamination strength lower than a heat bond strength in the heat bond surface and a bond strength in the bond surface. In the present invention, the metal container is a concept including containers and container bodies of all forms used for packaging foods and the like, and includes a metal can. The lid material is a concept including all forms of lid materials that can seal the container body at the opening site of the container body.

  In such an easy-open laminated film for sealing a lid material according to the present invention, since one surface is made of a material suitable for thermal bonding with a metal container and a surface for thermal bonding, the container is made of metal. Even if it is manufactured, high thermal bonding strength is obtained with the container, high sealing performance is obtained, and the other surface is made of a material suitable for bonding with the lid, and a performance bonding surface Therefore, high bonding strength can be obtained even with the lid member, and high sealing performance can be obtained. Therefore, excellent sealing performance can be obtained by interposing the laminated film between the container and the lid. And when opening the lid material, delamination inside the laminated film is used, but the delamination surface intended to perform this delamination appropriately is the surface for thermal bonding with the container side It is composed of an easily peelable surface that has a lower delamination strength than the bonding strength at the bonding surface with the lid and the lid material side. The peeling which is scheduled on the easy peeling surface is surely performed with a low peeling force without causing peeling on the surface, and the opening is easily performed through this peeling. As a result, an easy-open laminated film for a lid seal that effectively achieves both excellent sealing properties and excellent easy-open properties is realized.

  In the easy-open laminated film for sealing a lid according to the present invention, it is possible to use a two-layer laminated film as the laminated film, but the laminated film is composed of a laminated film of three or more layers, A configuration in which the interlayer constitutes the easy-release surface is preferable. In such a configuration, in the laminated film, while achieving both the heat bonding surface having the heat bonding strength with the desired container side and the bonding surface having the bonding strength with the desired lid material side, the desired An easily peelable surface that can be reliably peeled off with a low peel force is more easily formed.

  In this case, a first outer layer that forms a surface for thermal bonding with the metal container, a second outer layer that forms a bonding surface with the lid member, and a configuration of the first outer layer and the second outer layer The material preferably has a structure having an incompatible resin or an intermediate layer made of a resin composition containing the resin. The constituent material of the first outer layer and the second outer layer is a boundary between the intermediate layer and the first outer layer or the second outer layer by forming an intermediate layer made of an incompatible resin or a resin composition containing the resin. It is possible to easily form the surface on a desired easily peelable surface. The first outer layer and / or the second outer layer is preferably made of, for example, an olefin resin or a resin composition containing the olefin resin. The first outer layer can also be composed of a modified resin of an olefin resin. As the olefin resin constituting the outer layer, for example, polyethylene or polypropylene can be used. Moreover, in the use which performs a retort process, the heat-resistant polypropylene and the modified resin of polypropylene are preferable, for example.

  As the intermediate layer, in order to achieve a desired low peeling force, it is preferable that the delamination strength between the layers on both sides in the stacking direction is appropriately low. For example, the intermediate layer is preferably composed of a layer having a delamination strength of 10 N / 15 mm or less with the layers on both sides in the stacking direction.

  With respect to a preferable material for constituting the intermediate layer, the intermediate layer preferably contains at least one of a nylon resin, a polyester resin, an ethylene-vinyl alcohol copolymer resin, and a polymethylpentene resin.

  Moreover, in the easy-open laminated film for sealing a lid material according to the present invention, at least one surface is configured as a surface for thermal bonding with a metal container, and the bonding surface with the lid material is also a surface for thermal bonding. It may be configured.

  According to the present invention, an easy-open container is provided. In this easy-open container, the material on the container side is not limited to metal, and may be made of plastic. That is, the easily openable container according to the present invention is a plastic or metal container in which the peripheral edge of the hole is sealed with a lid material with a seal layer interposed therebetween, and the seal layer is an opening of the container. It is composed of a laminated film having an easily peelable surface having a delamination strength lower than the thermal adhesive strength with the peripheral edge and the joining strength with the lid material, and the laminated film is joined to the lid material in the surface direction of the laminated film. The position of the peeling start portion by the easy peeling surface in the seal layer at the outer edge portion of the first bonding region is the outer edge of the second bonding region where the laminated film is thermally bonded to the peripheral edge of the opening of the container It is characterized by being set at a position closer to the opening from the portion (first easy-open container). This first easily openable container is an easily openable container on the premise that opening is performed from the outside of the container.

  Further, the easy-open container according to the present invention is a plastic or metal container in which the peripheral edge of the hole is sealed with a lid material with a seal layer interposed therebetween, and the seal layer is an opening of the container. It is composed of a laminated film having an easily peelable surface having a delamination strength lower than the thermal adhesive strength with the peripheral edge and the joining strength with the lid material, and the laminated film is joined to the lid material in the surface direction of the laminated film. The position of the peeling start portion by the easy peeling surface in the seal layer in the inner edge portion of the first bonding area is the inner edge of the second bonding area where the laminated film is thermally bonded to the peripheral edge of the opening of the container (2nd easily openable container) characterized by being set at a position far from the opening to the opening. This second easily openable container is an easily openable container on the premise that the opening is performed from the inside of the container due to the vapor pressure or the like inside the container.

  In the easy-open container according to the present invention, such as the first easy-open container and the second easy-open container, the peel start side by the easy peel surface in the seal layer is defined with respect to the seal layer. It can be set on either the outer side or the inner side of the container. If the peeling start side is set to the outside of the container as in the first easy-open container, the easy-openability accompanying the operation in the opening direction of the lid is improved, and the second easy-open container Thus, if the peeling start side is set to the inner side of the container, the easy opening by the easy peeling surface can be applied to, for example, internal steam venting of the container containing the retort food.

  In such an easy-open container according to the present invention, the sealing layer interposed between the lid material and the peripheral edge of the opening of the container is a laminated film as described above, that is, the opening of the container It is composed of a laminated film having an easily peelable surface with a delamination strength lower than the thermal bonding strength with the peripheral edge and the bonding strength with the lid material. The positional relationship between the end portions of the joining region with the peripheral edge portion is set to a specific positional relationship. That is, in the surface direction of the laminated film, in the first easy-open container, the position of the peeling start portion by the easy peeling surface in the seal layer at the outer edge portion of the first joining region where the laminated film is joined to the lid material. Is set at a position near the opening from the outer edge of the second joining region where the laminated film is thermally bonded to the opening peripheral edge of the container, and in the second easy-open container, the laminated film is The position of the peeling start portion by the easy peeling surface in the seal layer at the inner edge portion of the first bonding region to be bonded is from the inner edge portion of the second bonding region where the laminated film is thermally bonded to the opening peripheral edge portion of the container. It is set at a position far from the opening. When the lid is operated in the opening direction, the lid in the thickness direction lid material side portion of the laminated film bonded with the lid material with a bonding strength higher than the delamination strength between the lid material and the easily peelable surface is To be peeled from the easy peel surface in the opening direction with respect to the thickness direction aperture peripheral edge side portion of the laminated film joined with a thermal adhesive strength higher than the delamination strength between the perforated peripheral edge portion and the easy peel surface However, as described above, the position of the end portion of the first bonding region (the bonding region on the lid material side) is the position of the end portion of the second bonding region (the bonding region on the opening peripheral edge side of the container). Rather than being set closer to the center of the intervening region of the seal layer, the peeling start operation on the peeling start side on the easy peeling surface is more easily performed along with the operation in the opening direction of the lid. , Easy openability is improved. The reason why the peeling start operation on the peeling start side of the easy peeling surface is likely to be performed is that the laminated film surface direction is between the position of the end of the first bonding region and the position of the end of the second bonding region. It is considered that there is a distance (positional difference in the laminated film surface direction), and in the laminated film surface direction, the end of the first bonding region is located in the middle of the second bonding region. With the operation in the opening direction of the material, the opening operation with the peeling operation by the easy peeling surface from the end position of the first joining region which becomes the position of the opening start side (the peeling start side for the easy peeling surface) is performed. It is because it becomes easy to be performed easily.

  Laminated film surface direction distance between the position of the end of the first bonding area and the position of the end of the second bonding area (in the case of the first easy-open container, the outer edge of the first bonding area Laminated film surface direction distance between the position of the peeling start part in the part and the position of the end part of the outer edge part of the second joining region, and in the second easy-open container, the inner edge part of the first joining region The distance in the laminated film surface direction between the position of the peeling start portion and the position of the end portion of the inner edge portion of the second bonding region is preferably set to 5 times or more the thickness of the laminated film. By setting in this way, the position of the end portion of the first joining region that forms the start position of the opening and peeling operation is set with respect to the position of the end portion of the second joining region on the opening peripheral edge side of the container. It can be distinguished and set more clearly, and the desired easy-openability can be achieved more reliably.

  Moreover, in the easily openable container which concerns on this invention, the said seal layer can employ | adopt the form heat-bonded also with the cover material. Of course, it is also possible to adopt a bonding form other than thermal bonding.

  The laminated film may be a two-layer laminated film, but the laminated film is composed of three or more laminated films, and any one of the internal layers constitutes the easily peelable surface. preferable.

  Thus, when it consists of a laminated film of three or more layers, this laminated film forms the 1st outer layer which forms the heat bonding surface with the opening peripheral edge part of a container, and the 2nd surface which forms the surface for joining with a lid material. The outer layer and the constituent materials of the first outer layer and the second outer layer preferably have an incompatible resin or an intermediate layer made of a resin composition containing the resin.

  In this case, the first outer layer and / or the second outer layer is preferably made of an olefin resin or a resin composition containing the olefin resin. The first outer layer is preferably made of a modified resin of an olefin resin. As the olefin resin constituting the outer layer, for example, polyethylene or polypropylene can be used. Moreover, in the use which performs a retort process, the heat-resistant polypropylene and the modified resin of polypropylene are preferable, for example.

  Moreover, as said intermediate | middle layer, in order to achieve a desired low peeling force, it is preferable that the delamination strength with the layer of the both sides of the lamination direction is low appropriately. For example, the intermediate layer is preferably composed of a layer having a delamination strength of 10 N / 15 mm or less with the layers on both sides in the stacking direction.

  With respect to a preferable material for constituting the intermediate layer, the intermediate layer preferably contains at least one of a nylon resin, a polyester resin, an ethylene-vinyl alcohol copolymer resin, and a polymethylpentene resin.

  Thus, according to the easy-open laminated film for lid | cover material which concerns on this invention, the outstanding sealing performance and the outstanding easy-openability can be made to make compatible effectively. Moreover, according to the easily openable container which concerns on this invention, the opening operation | movement using the easy peelability by the easy peel surface in a laminated | multilayer film can be performed easily and reliably.

It is a partial longitudinal cross-sectional view of the container which shows an example of the easy-open container using the easy-open laminated film for lid | cover material which concerns on one embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an easy-open container 2 using an easy-open laminated film 1 for lid sealing according to an embodiment of the present invention, and in particular, one embodiment of the first easy-open container described above. Is shown. The container body 3 of the easy-open container 2 can be made of plastic or metal, and in this embodiment, it is made of a metal (for example, aluminum) container body. An easy-open laminated film 1 for sealing a lid material is interposed as a sealing layer between a flange portion 4 as a peripheral edge of the opening of the container body 3 and the lid material 5, and the container is sealed and sealed at this portion. . In the present embodiment, the lid member 5 is formed of a plastic sheet, for example, a laminate film, but may be formed of a sheet or a thin plate of another material (for example, a metal such as aluminum). .

  In this embodiment, the laminated film 1 forms a bonding surface 8 for bonding the lid 5 with a first outer layer 7 that forms a heat bonding surface 6 with the container body 3, particularly with the flange portion 4 (this book). In the embodiment, the bonding surface 8 is also formed on the heat bonding surface) and the second outer layer 9 and the constituent materials of the first outer layer 7 and the second outer layer 9 are incompatible resins or the same. It is comprised in the 3 layer laminated film with the intermediate | middle layer 10 which consists of a resin composition to contain. The first outer layer 7 and / or the second outer layer 9 can be composed of, for example, an olefin resin or a resin composition containing the olefin resin, and the first outer layer 7 is made of a modified resin of an olefin resin. It can also be configured. The intermediate layer 10 is configured as a layer containing at least one of nylon resin, polyester resin, ethylene-vinyl alcohol copolymer resin, and polymethylpentene resin.

  The easy-open laminated film 1 for sealing the lid material has a thermal adhesive strength in the surface 6 for thermal bonding between the flange portion 4 of the container body 3 and the first outer layer 7, and the lid material 5 and the second outer layer 9. In the present embodiment, the boundary surface between the second outer layer 9 and the intermediate layer 10 is the easily peelable surface 11. Is formed.

  In the easy-open container 2, the first easy-to-open laminated film 1 for sealing a lid material interposed between the flange portion 4 of the container body 3 and the lid material 5 as a seal layer is joined to the lid material 5. The position 14 of the edge part in the peeling start side (peeling start point 13) by the easy-peeling surface 11 in the laminated | multilayer film 1 of the joining area | region 12 is thermally bonded to the flange part 4 as the peripheral edge part of the opening of the container. The second bonding region 15 is the second position as viewed in the plane direction of the laminated film 1 rather than the end position 16 on the peeling start side (peeling start point 13) by the easy peeling surface 11 in the laminated film 1. 1 is set at a position closer to the opening from the outer edge of the bonding region 15 (a position on the left side in FIG. 1 and a position closer to the center of the intervening region of the seal layer). In FIG. 1, the easy-open laminated film 1 for sealing the lid material is displayed in an enlarged manner in the thickness direction, but the position 14 of the end portion of the first joining region 12 and the second joining region 15 are displayed. The distance d in the laminated film surface direction from the end position 16 is set to be 5 times or more the thickness of the laminated film 1.

  In the easy-open container 2 using the easy-open laminated film 1 for cover material sealing configured as described above, the seal by the cover material 5 is released by operating the cover material 5 in the opening direction 17. The container 2 is opened. That is, the delamination strength is lower than the thermal bonding strength between the heat bonding surface 6 and the flange portion 4 of the container body 3 and the bonding strength with the lid material 5 in accordance with the operation in the opening direction 17 of the lid material 5. The delamination is started from the peeling start point 13 of the easy-peeling surface 11, and the peeling is continued along the easy-peeling surface 11 to complete the opening. At this time, the end position 14 of the first bonding region 12 on the peeling start side is the end position 16 of the second bonding region 15 on the peeling start side (that is, the second bonding region 15 of the second bonding region 15). Is set closer to the opening than the edge of the outer edge), the peeling start operation on the easy peeling surface 11 accompanying the movement of the lid 5 in the opening direction 17 is facilitated, and easy opening Is improved.

  In the above opening operation, when delamination is started from the peeling start point 13 of the easy peeling surface 11, the second outer layer 9 located on the outer side of the container (right side in FIG. 1) from the peeling start point 13. There is a possibility that a division may occur between the portion and the second outer tub 9 portion located on the inner side of the container (on the left side in FIG. 1) from the peeling start point 13 (the dividing point 18). In order to make it easy, for example, a cut line such as a perforation may be made in advance at the position of the dividing point 18.

  Moreover, in the said embodiment, although the peeling start point 13 of the peeling start side by the easy peeling surface 11 in the laminated | multilayer film 1 is set to the exterior side of the container 2, like the above-mentioned 2nd easily openable container, It is also possible to set the inner side of the container 2. In this case, the position 14 of the end portion of the first joining region 12 in FIG. 1, the peeling start point 13, and the position 16 of the end portion of the second joining region 15 are the container inner side opposite to FIG. Is not shown in the figure. In this case, as described above, the easy-opening property by the easily peelable surface 11 can be applied to, for example, internal steam venting of a container containing retort food.

Next, an example of the manufacturing method of the easy-open laminated film for lid | cover material sealing of this invention is demonstrated.
Using three extruders, a density of 0.87 to 0.91 g / cm ³ and a melt flow rate (MFR) (230 ° C.) of 2 to 8 g / 10 as a first outer layer resin from one extruder. The polypropylene resin in the range of minutes is extruded at 220 to 230 ° C., and the density is 0.82 to 0.91 g / cm ³ and the MFR (230 ° C.) is 2 to 15 g / 10 as an intermediate layer resin from another extruder. For example, a poly-4-methylpentene-1 resin having a density of 0.9 to 0.91 g / cm ³ from the other extruder as a second outer layer resin, MFR ( 230 ° C.) is extruded at 220 ° C. to 230 ° C. and laminated with a co-extrusion multilayer die. The thickness of the first outer layer is 5 μm, the thickness of the intermediate layer is 40 μm, The thickness of the second outer layer is 5μ Become manner, extruded into a film, cast on a cooling roll of 25 to 50 ° C. and cooled and solidified, the easily openable laminated film lid material sealing. When changing the resin material of each layer, the extrusion temperature may be set by a conventional method in consideration of the melting point and MFR of the resin. However, it is difficult to laminate resins having significantly different MFR, and the resin combination Needless to say, there are limitations.

  Subsequently, if necessary, the surface of the second outer layer is subjected to corona discharge treatment, wound up, and further slit to a predetermined width and length.

  In the initial stage of peeling in the opening operation, it is necessary for the second outer layer that forms the bonding surface with the lid material to break in the thickness direction, and if the thickness of the second outer layer is too thick In some cases, it is difficult to break and cannot be easily peeled off. For this reason, the thickness of the second outer layer is preferably 15 μm or less, more preferably 10 μm or less, although it depends on the design value of the delamination strength for peeling.

  Hereinafter, the present invention will be described based on examples, but the present invention is not limited thereto. The characteristic measuring method and the effect evaluating method in the present invention are as follows.

(1) Density of resin The density was measured in accordance with the density gradient tube method defined in JIS K 7112 (1980).

(2) Film thickness Using a dial gauge thickness gauge (JIS B 7509 (1992), measuring element 5 mmφ flat type), 10 points are measured at 10 cm intervals in the longitudinal direction and the width direction of the film, and the average value is obtained. It was.

(3) Thickness of each layer The cross section of the film was cut out with a microtome, and the cross section was magnified 1000 times using a digital microscope VHX-100 type (manufactured by Keyence Corporation). The distance in the thickness direction of each layer was measured, and the thickness of each layer was obtained by calculating backward from the magnification. In determining the thickness of each layer, a total of five cross-sectional photometers arbitrarily selected from different measurement visual fields were used, and the average value thereof was calculated.

(4) Melt flow rate (MFR)
In accordance with JIS K 7210, the polyethylene resin was measured at 190 ° C., and the polypropylene resin was measured at 230 ° C.

(5) Aluminum sheet for evaluation (AL sheet)
As the container sheet, aluminum sheet # 3000 (for example, manufactured by Toyo Seikan Co., Ltd. or Yamato Seikan Co., Ltd.) that is not used for epoxy resin coating for corrosion prevention was used.

(6) Preparation of cover sheet Biaxially stretched nylon film ("Emblem" ON made by Unitika Ltd.) and unstretched polypropylene film ("Trephan" NO ZK93KM made by Toray Film Processing Co., Ltd.) with polyurethane adhesive Dry lamination was performed at a solid content coating amount of 2 g / cm ² , and aging was performed at 40 ° C. for 72 hours to prepare a lid sheet.

(7) Aluminum seal strength Prepared by molding the aluminum (AL) sheet prepared in (5) into a width of 30 mm and a length of 100 mm, and cut the easy-open laminated film for sealing the lid material into a width of 30 mm and a length of 40 mm. The top of the aluminum sheet is placed on the end of the aluminum sheet with the first outer layer side facing the aluminum sheet, and an impulse sealer (CA-450-10) manufactured by Fuji Impulse Co., Ltd. is used. ) Between the ends on which the easy-open laminated film for sealing the lid is placed, and the easy-open laminated film for sealing the lid under the conditions of a heating time of 0.8 seconds and a cooling time of 3.0 seconds Impulse seal the center part of the 40mm depth of the to confirm whether it was able to seal. The case where the easy-open laminated film for sealing the lid material was pulled and sealed could be indicated by ◯, and the case where the sealing could not be performed was indicated by ×.

(8) Evaluation of easy-openability Following (7), the lid sheet made in (6) is cut to 30 mm x length 100 mm, the ZK93KM side and the second outer layer side are matched, and the conditions of the impulse sealer are the same The position where the end portion on the side laminated with the easy-open laminated film for lid sealing is inserted between the upper and lower seal bars, and the aluminum sheet and the easy-open laminated film for lid sealing are sealed. Impulse sealing was performed at a position 1 mm deeper than the inner side. When the aluminum sheet and the lid sheet were peeled by hand, the case where peeling was possible between the layers of the easy-open laminated film for lid sealing with an appropriate force was marked as ◯, and the case where peeling was not possible was marked as x.

The raw materials used in this example are as follows.
(1) Modified polypropylene (modified PP) (PP-1)
“Modic” P614V manufactured by Mitsubishi Chemical Corporation, MFR (230 ° C.): 3.4 g / 10 min, density: 0.90 g / cm ³

(2) Modified polypropylene (modified PP) (PP-2)
“Modic” P565 manufactured by Mitsubishi Chemical Corporation, MFR (230 ° C.): 5.9 g / 10 min, density: 0.89 g / cm ³

(3) Homopolypropylene (H-PP) (PP-3)
“Prime Polypro” F107DJ manufactured by Prime Polymer Co., Ltd., MFR (230 ° C.): 8.0 g / 10 min, density: 0.90 g / cm ³

(4) Ethylene / propylene random copolymer (EPC) (PP-4)
Sumitomo Chemical Co., Ltd. Sumitomo “Noblen” FL6412, MFR (190 ° C.): 6.0 g / 10 min, density: 0.900 g / cm ³

(5) Ethylene / propylene block copolymer (B-PP) (PP-5)
WFS 5293-17 manufactured by Sumitomo Chemical Co., Ltd., MFR (190 ° C.): 3.0 g / 10 min, density: 0.90 g / cm ³

(6) Poly-4-methylpentene-1 (TPX) (TP-1)
“TPX” EP0518 manufactured by Mitsui Chemicals, MFR (190 ° C.): 4.0 g / 10 min, density: 0.83 g / cm ³

(7) Ethylene / vinyl alcohol copolymer (EVOH) (EV-1)
“Eval” E105B manufactured by Kuraray Co., Ltd., MFR (190 ° C.): 5.7 g / 10 min, density: 1.14 g / cm ³

(8) Nylon 6 (N6) (NY-1)
UBE nylon 1013B manufactured by Ube Industries, Ltd., density: 1.14 g / cm ³

(9) Polyester (PET) (PT-1)
“Byron” GM913 manufactured by Toyobo Co., Ltd., density: 1.15 g / cm ³

Example 1
100% by weight of modified polypropylene (PP-1) is used as the resin of the first outer layer, 100% by weight of poly-4-methylpentene-1 (TP-1) is used as the intermediate layer, and homopolypropylene (PP) is used as the second outer layer. -3) 100% by weight was put into each of three extruders of a three-type three-layer unstretched film forming machine, extruded from a T-die at 230 ° C at an extrusion temperature of 180-230 ° C, and rapidly cooled with a casting roll at 40 ° C An easy-open laminated film for sealing the lid material was molded. The total thickness of the obtained easy-open laminated film for sealing a lid material was 50 μm, the thickness of the first outer layer was 5 μm, the thickness of the intermediate layer was 40 μm, and the thickness of the second outer layer was 5 μm.

Example 2
The same operation as in Example 1 was performed except that the first outer layer was changed to 100% by weight of modified polypropylene (PP-2).

Example 3
The same operation as in Example 1 was conducted except that the intermediate layer was made 100% by weight of ethylene / vinyl alcohol copolymer (EV-1).

Example 4
The same operation as in Example 1 was conducted except that the intermediate layer was made of nylon 6 (NY-1) 100% by weight.

Example 5
The same operation as in Example 1 was performed except that the intermediate layer was 100% by weight of polyester (PT-1).

Example 6
The same operation as in Example 1 was carried out except that the second outer layer was 100% by weight of ethylene / propylene random copolymer (PP-4).

Example 7
The same operation as in Example 1 was conducted except that the second outer layer was made 100 wt% of an ethylene / propylene block copolymer (PP-5).

Example 8
The same operation as in Example 1 was performed except that the second outer layer was changed to 100% by weight of modified polypropylene (PP-1).

Example 9
The same operation as in Example 1 was performed except that the thickness of the first outer layer was 10 μm, the thickness of the intermediate layer was 30 μm, and the thickness of the second outer layer was 10 μm.

Comparative Example 1
The same operation as in Example 1 was performed except that the first outer layer was 100% by weight of homopolypropylene (PP-3) having no adhesiveness to aluminum.

Comparative Example 2
The same operation as in Example 1 was performed except that the intermediate layer was 100% by weight of homopolypropylene (PP-3).

Comparative Example 3
The same operation as in Example 1 was conducted except that the intermediate layer was made of 100% by weight of an ethylene / propylene random copolymer (PP-4).

Comparative Example 4
The same operation as in Example 1 was performed except that the intermediate layer was changed to 100% by weight of modified polypropylene (PP-1).

Comparative Example 5
The same operation as in Example 1 was performed except that the intermediate layer was changed to 100% by weight of modified polypropylene (PP-2).

  In Examples 1 to 8, it was possible to perform delamination between the second outer layer and the intermediate layer without delamination between the aluminum sheet and the first outer layer and between the lid sheet and the second outer layer. In Example 9, the thickness of the second outer layer was 10 μm and the initial peeling resistance was large, but peeling between the layers was possible and it was judged to be a practical level. It was confirmed that Comparative Example 1 could not be sealed to the aluminum sheet. In Comparative Examples 2, 3, 4, and 5, it was confirmed that there was no easy opening and no delamination.

Comparative Example 6
The aluminum sheet described in (7) of the evaluation method and the easy-open laminate film are sealed, and the lid sheet described in (8) is not stacked and sealed, but the aluminum sheet, easy-open laminate Three sheets of film and cover sheet were stacked and sealed at once with an impulse sealer. The aluminum sheet and the easy-open laminated film, the easy-open laminated film and the lid sheet are in the same seal, and when I tried to peel 10 samples by hand, 4 of them would peel off well. I could not.

  The easy-open laminate film for sealing a lid material according to the present invention can be applied to any metal container where easy-openability is desired, and the easy-open container according to the present invention can be applied to any container where easy-openability is desired. .

DESCRIPTION OF SYMBOLS 1 Easy-open laminated film 2 for lid | cover material sealing Easy-open container 3 Container body 4 Flange part 5 Cover material 6 Surface for heat bonding 7 First outer layer 8 Joining surface 9 Second outer layer 10 Intermediate layer 11 Easy peeling surface 12 First bonding area 13 Peeling start point 14 End position 15 Second bonding area 16 End position 17 Opening direction 18 Dividing point d Laminated film surface direction distance between end positions

Claims (19)

  A laminated film in which one surface is configured as a surface for thermal bonding with a metal container and the other surface is configured as a surface for bonding with a lid material, and the thermal bonding strength and the bonding in the surface for thermal bonding are included therein. An easily openable laminated film for sealing a lid material, characterized by having an easily peelable surface having a delamination strength lower than the bonding strength on the working surface.   The easily-openable laminated film for sealing a lid material according to claim 1, wherein the laminated film is composed of a laminated film of 3 or more layers, and any one of the internal layers constitutes the easy-release surface.   The first outer layer that forms the surface for thermal bonding with the metal container, the second outer layer that forms the bonding surface with the lid, and the constituent materials of the first outer layer and the second outer layer The easily openable laminated film for sealing a lid material according to claim 2, comprising an incompatible resin or an intermediate layer made of a resin composition containing the resin.   The easy-open laminated film for lid | cover material sealing of Claim 3 which said 1st outer layer and / or 2nd outer layer consist of an olefin resin or the resin composition containing it.   The easy-open laminated film for lid material sealing according to claim 3 or 4, wherein the first outer layer is made of a modified resin of an olefin resin.   The easy-open laminated film for sealing a lid material according to any one of claims 3 to 5, wherein the intermediate layer is composed of a layer having a delamination strength of 10 N / 15 mm or less with the layers on both sides in the lamination direction.   The easy opening property for lid | cover material sealing in any one of Claims 3-6 in which the said intermediate | middle layer contains at least any one of nylon-type resin, polyester-type resin, ethylene-vinyl alcohol copolymer resin, and polymethylpentene resin. Laminated film.  The easy-open laminated film for lid | cover material sealing in any one of Claims 1-7 by which the surface for joining with the said lid | cover material is also comprised by the surface for thermal bonding.   A plastic or metal container with a sealing layer interposed and a peripheral edge portion of the opening sealed with a lid material, wherein the sealing layer has a thermal bonding strength with the peripheral edge part of the opening of the container and the lid material The laminated film having an easy peel surface having a delamination strength lower than the bonding strength of the laminated film, and in the surface direction of the laminated film, the laminated film is bonded to the lid member at the outer edge portion of the first bonding region. The position of the peeling start portion by the easy peeling surface in the seal layer is set to a position near the opening from the outer edge portion of the second bonding region where the laminated film is thermally bonded to the opening peripheral edge of the container. An easily openable container characterized by that.   The laminated film surface direction distance between the position of the peeling start portion in the outer edge portion of the first bonding region and the position of the end portion of the outer edge portion of the second bonding region is 5 times or more the thickness of the laminated film. The easily openable container according to claim 9, wherein   A plastic or metal container with a sealing layer interposed and a peripheral edge portion of the opening sealed with a lid material, wherein the sealing layer has a thermal bonding strength with the peripheral edge part of the opening of the container and the lid material The laminate film having an easy peel surface with a delamination strength lower than the bond strength of the laminate film, and in the surface direction of the laminate film, the laminate film is joined to the lid member at the inner edge portion of the first joining region. The position of the peeling start part by the easy peeling surface in the seal layer is set at a position far from the inner edge of the second bonding region where the laminated film is thermally bonded to the peripheral edge of the opening of the container. An easily openable container characterized by that.   The laminated film surface direction distance between the position of the peeling start portion in the inner edge portion of the first bonding region and the position of the end portion of the inner edge portion of the second bonding region is 5 times or more the thickness of the laminated film. The easily openable container according to claim 11, wherein   The easily openable container according to any one of claims 9 to 12, wherein the seal layer is also thermally bonded to the lid member.   The easily openable container according to any one of claims 9 to 13, wherein the laminated film is composed of a laminated film of three or more layers, and any one of the internal layers constitutes the easily peelable surface.   The laminated film includes a first outer layer that forms a thermal bonding surface with the peripheral edge of the opening of the container, a second outer layer that forms a bonding surface with the lid member, a first outer layer, and a second outer layer. The easily openable container according to claim 14, wherein the constituent material of the outer layer includes an incompatible resin or an intermediate layer made of a resin composition containing the resin.   The easily openable container according to claim 15, wherein the first outer layer and / or the second outer layer are made of an olefin resin or a resin composition containing the olefin resin.   The easily openable container according to claim 15 or 16, wherein the first outer layer is made of a modified resin of an olefin resin.   The easily openable container according to any one of claims 15 to 17, wherein the intermediate layer is composed of a layer having a delamination strength of 10 N / 15 mm or less with layers on both sides in the stacking direction.   The easily openable container according to any one of claims 15 to 18, wherein the intermediate layer contains at least one of a nylon resin, a polyester resin, an ethylene-vinyl alcohol copolymer resin, and a polymethylpentene resin.

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