JP4363008B2 - Lid material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid, made of paper as its main material, for hermetically sealing a container, wherein the lid maintains the conventional pealing strength in unsealing, avoids a production cost increase, and prevents the lid itself from tearing. <P>SOLUTION: The lid for hermetically sealing an opening defined along the upper edge of a container body comprises a paper layer serving as an outermost layer, an aluminum foil as an intermediate layer, and a sealant layer as the innermost layer. The sealant layer 30 is formed from a co-extrusion film which has a five-layer structure consisting of a polyethylene resin layer 36, an adhesive resin layer 33, a polyester or polyamide resin layer 34, an adhesive resin layer 33, and an easy-to-peel resin layer 32. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid material suitable for sealing and sealing the flange part of a container body having an opening part at the upper end and a flange part at the upper end rim, particularly for storing instant noodles, etc. The present invention relates to a cover material mainly composed of paper that seals and seals an opening of a container to be poured and eaten.
[0002]
[Prior art]
Conventionally, for example, a foam bead-molded polystyrene container for storing instant noodles, instant soup, etc., mainly made of paper that seals the flange part of the container body having an opening at the upper end and a flange part at the upper end periphery with a seal or the like As a cover material, an aluminum foil and an easy peelable sealant layer laminated on the lower surface of the paper layer are known. The opening (opening) is picked up by pulling the opening pull tab on the outer periphery, and the sealant is pulled up. It is made to peel off from the layer surface.
[0003]
The step of laminating and laminating the above-described conventional lid material will be described more specifically. For example, as shown in the sectional side sectional view of FIG. 4, as the outermost paper layer (10) having the printing layer (11) on the surface, Is a piece of art paper with a basis weight of 79.1 g / m 2, an aluminum foil (20) having a thickness of 6 to 7 μm as an intermediate layer, and an easily peelable easily peelable resin layer (30) as the innermost layer, and a thickness of about 25 μm Easy-peelable resin, for example, a low-density polyethylene resin mixed with an incompatible component such as polystyrene or polybutene, and laminated by extrusion lamination of polyethylene. A paper layer (10) and an aluminum foil ( 20) is laminated (adhered) with a polyethylene-extruded sand polyethylene layer (15), and an easy-release resin is extruded onto the aluminum foil (20) surface. It is common to peeling the resin layer (30) formed by the sealant layer.
[0004]
[Problems to be solved by the invention]
However, when opening (opening) the conventional lid member having the above structure, as shown in the perspective view of FIG. 5, for example, the opening pull tab (12) on the outer peripheral edge is picked up and pulled up, and the container body (2) If the easily peelable resin layer surface (30a) of the lid member (1) is peeled from the flange portion (21), the flange portion (21) may not be partially peeled off, and the lid material (1) is torn at that portion. Has occurred, and part (1a) of the lid member partially remains on the flange portion (21), and there is a problem that normal opening may not be possible.
[0005]
This is because of the weak tear strength of the lid (1) itself, the variation in the balance between adhesion and easy peelability between the easily peelable resin layer surface (30a) and the flange portion (21), and peeling (pulling up). Although it occurs depending on the speed, etc., it must be able to open normally without tearing or tearing even if the customer peels at any speed or force.
[0006]
Therefore, as a countermeasure for solving the above problem, for example, there is a method of lowering the peel strength (adhesive strength) of the sealant layer. However, if this peel strength is too low, it may be peeled off when it is not necessary, such as during transportation. In addition, there is a method of making the lid itself difficult to break as a laminate of aluminum foil and polyethylene terephthalate film via a dry lamination adhesive, but there is a problem that the manufacturing cost increases due to an increase in the number of processes and materials (raw fabric). there were.
[0007]
The present invention solves the problems of the prior art, and the problem is that the paper is mainly used for the lid that seals and seals the opening of the container. An object of the present invention is to provide a lid material that is maintained and is not expensive to manufacture and has no tearing of the lid material itself.
[0008]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, first, in the invention of claim 1, a laminated body for sealing and sealing the upper edge opening of the container body, and a lid member having an opening tab on the outer periphery, In the laminate, the outermost layer is a paper layer, the intermediate layer is an aluminum foil, and the innermost layer is a sealant layer. The sealant layer has a polyethylene resin layer on one side of a polyester resin layer or a polyamide resin layer, and an opposite side. It consists of a co-extruded film having a five-layer structure in which an easily peelable resin layer is provided via an adhesive resin layer, and the polyethylene resin layer surface of the sealant layer is interposed between the aluminum layer via a sand polyethylene layer formed by extrusion of polyethylene. A lid material characterized by being bonded to a foil .
[0009]
According to the first aspect of the present invention, the innermost sealant layer has a polyethylene resin layer on one side of the polyester resin layer or polyamide resin layer and an easily peelable resin layer on the opposite side through the adhesive resin layer. It consists of a co-extruded film with a five-layer structure, and a particularly tear-resistant polyester resin layer or polyamide resin layer is laminated in the middle. When the surface of the sealant layer is peeled off, the lid material is not torn and normal opening can be achieved. In addition, since the innermost surface is made of an easily peelable resin as in the conventional case, it is possible to provide an easily peelable lid member that maintains a balanced heat sealability and peel strength (also adhesive strength).
[0011]
In addition, the innermost sealant layer is a five-layer structure in which a polyethylene resin layer is provided on one side of a polyester resin layer or a polyamide resin layer, and an easily peelable resin layer is provided on the opposite side via an adhesive resin layer. Because it is an extruded film and a laminate of the outermost paper layer and the intermediate aluminum foil, there is no increase in the number of steps and the original fabric, and a coextruded film of a single layer to a five-layer structure as the original fabric. Therefore, it is possible to obtain an easily peelable lid member whose manufacturing cost is relatively low.
[0012]
According to a second aspect of the present invention, there is provided the lid according to the first aspect, wherein the paper layer and the aluminum foil are bonded together by extrusion lamination of polyethylene.
[0013]
According to the second aspect of the present invention, the paper layer and the aluminum foil are bonded together by extrusion lamination of polyethylene, and the aluminum foil and the sealant layer are bonded together by extrusion lamination of polyethylene. It can be set as the easily peelable lid | cover material which enables lamination | stacking.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
As shown in the perspective view of FIG. 1, the present invention is for sealing and sealing a flange portion (21) of a container body (10) having an opening portion at the upper end and a flange portion (21) at the upper end periphery. A suitable paper-based lid (1) with an opening pull tab (12) at the periphery, especially for storing instant noodles etc. of the contents and for opening the instant noodles etc. The present invention relates to a container lid (1) for picking and pulling the pull tab (12) and opening it.
[0016]
Therefore, in the lid material of the present invention, the outermost layer is a paper layer (10) having a printing layer (11) on the surface, and the intermediate layer is an aluminum foil (20), as shown in the sectional side sectional view of FIG. The innermost layer in contact with the contents is a lid material (1) made of a sealant layer (30), and each layer (10, 20, 30) is bonded with a sand polyethylene layer (15) made by extrusion of polyethylene. In the invention according to claim 1, for example, as shown in the sectional side view of FIG. 3, from the innermost surface (the surface touched by the contents and also the surface heat-sealed to the container flange). An easily peelable resin layer (32), a polyester or polyamide resin layer (34), and a polyethylene resin layer (36) on the outermost surface (the surface bonded to the intermediate aluminum foil (20) shown in FIG. 2), Adhesive resin for each (33) It is an sealant layer being bonded via a (30).
[0017]
Thus, a tear-resistant (breaking-resistant) polyester or polyamide resin layer (34) and an easily peelable resin layer (32) with the same balance of heat sealability and peelability as conventional are laminated on the innermost surface. Therefore, the lid material (1) is not torn when opened, and the conventional easy peelability is maintained, so that the lid material (1) can be easily opened normally.
[0018]
As a polyethylene resin layer (36) which comprises the said sealant layer (30), the layer by linear low density polyethylene resin (LLDPE), low density polyethylene (LDPE), medium density polyethylene resin (MDPE) etc. is mentioned, for example. In particular, the linear low density polyethylene resin (LLDPE) and the ethylene-methacrylic acid copolymer (EMAA) can be used as suitable materials from the viewpoint of processability (particularly heat sealability).
[0019]
Further, the polyester or poly A phagemid resin layer constituting the sealant layer (30) as (34), for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) such as a polyester resin or nylon, A layer made of a polyamide resin typified by a resin (Ny) can be mentioned, and in particular, the former polyethylene terephthalate (PET) or nylon (Ny) can be used as a suitable material from the viewpoint of material cost.
[0020]
Moreover, as the easily peelable resin layer (32) constituting the sealant layer (30), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), unstretched polypropylene (CPP), etc. excellent in heat sealability, etc. However, since the adhesive strength and the peel strength may not be balanced only with these resins, for example, these polyolefin resins are further composed of polystyrene, polybutene, etc. For example, CMPS: VN503 (manufactured by Mitsui DuPont Polychemical Co., Ltd.) or the like can be suitably used as an adhesive polyolefin resin extrusion grade.
[0021]
Furthermore, as the easily peelable resin layer (32) constituting the sealant layer (30), for example, a hot melt resin (adhesive) made of ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin or the like is used. These easily peelable resin layers (32) can enable sufficient sealing and peel-opening properties with the flange portion (21) of the container body (2).
[0022]
The sealant layer (30) is an adhesive resin layer (33) for bonding the polyethylene resin layer (36), the polyester or polyamide resin layer (34), and the easily peelable resin layer (32). For example, a layer made of an unsaturated carboxylic acid-modified polyethylene resin is preferably used in terms of processability and adhesiveness.
[0023]
Further, the invention according to claim 1 includes, for example, a sealant layer (30) shown in a sectional side sectional view of FIG. 3, a polyethylene resin layer (36) having a thickness of about 7 to 8 μm, and an adhesive resin having a thickness of about 2 to 3 μm. Layer (33), polyester or polyamide resin layer (34) having a thickness of about 5 to 6 μm, adhesive resin layer (33) having a thickness of about 2 to 3 μm, and easily peelable resin layer (32) having a thickness of about 7 to 8 μm In this order, a five-layer coextruded film is formed by a melt extruder. As shown in FIG. 2, this five-layer coextruded film is used as a sealant layer (30), and sand is applied to the aluminum foil (20) surface. It is possible to obtain a cover material (1) which is bonded via a polyethylene layer (15) and does not increase the number of steps and the original fabric (a coextruded film having a five-layer structure is used as one original fabric).
[0024]
Furthermore, the invention according to claim 2 is a co-extrusion of a paper layer (10) having a printed layer (11) on the surface, an aluminum foil (20), and the above five-layer structure, for example, as shown in FIG. A molten polyethylene resin is extruded between the film and the sealant layer (30), and a sand polyethylene layer (15) of about 5 to 20 μm is formed and laminated. The lid material (1) can be used.
[0025]
The paper layer (10) constituting the lid material (1) of the present invention preferably has at least a white surface and has multicolor printing suitability, for example, a basis weight of about 50 g / m 2 to 120 g / m 2, preferably 75 g. It is possible to suitably use both art paper, single art paper, double-sided, single-sided coated paper, etc. of about / m2 to 100 g / m2.
[0026]
Further, the aluminum foil (20) constituting the lid material (1) of the present invention has a thickness of about 7 to 9 μm and has a light shielding property and gas barrier property for protecting the contents (for example, dried noodles). In addition, when the lid is opened, when approximately half of the lid is peeled off from the container flange portion, the lid has a property of keeping the curled state outside (referred to as a dead hold property). It is a suitable material that can be poured.
[0027]
【The invention's effect】
Since this invention is the above structure, there exist the following effects.
That is, in the first aspect of the present invention, it is a laminated body that seals and seals the upper edge opening of the container body, and has a tab for opening on the outer peripheral edge, the outermost layer being a paper layer. The intermediate layer is an aluminum foil, the innermost layer is a sealant layer, the innermost sealant layer is formed of a polyester resin layer or a polyamide resin layer on one side, a polyethylene resin layer on the opposite side, and an easily peelable resin layer on the opposite side. A co-extruded film with a five-layer structure provided through an adhesive resin layer, especially a tear-resistant polyester resin layer or polyamide resin layer laminated in the middle, so pull up the pull pull tab to open the container body When the sealant layer surface is peeled from the flange portion, the lid material is not torn and normal opening can be achieved.
[0028]
In addition, since the innermost surface is made of the same easy-peeling resin as the conventional one, it is possible to provide an easily-peelable lid member that maintains a balanced heat sealability and peel strength (also adhesive strength).
[0029]
In addition , the innermost sealant layer is a five-layer structure in which a polyethylene resin layer is provided on one side of a polyester resin layer or a polyamide resin layer, and an easily peelable resin layer is provided on the opposite side via an adhesive resin layer. Because it is an extruded film and a laminate of the outermost paper layer and the intermediate aluminum foil, there is no increase in the number of steps and the original fabric, and a coextruded film of a single layer to a five-layer structure as the original fabric. Therefore, it is possible to obtain an easily peelable lid member whose manufacturing cost is relatively low.
[0030]
Furthermore, in the invention according to the second aspect , the paper layer and the aluminum foil are bonded with a sand polyethylene layer by extrusion extrusion lamination of polyethylene , and the aluminum foil and the sealant layer are also bonded by extrusion extrusion lamination of polyethylene. Therefore, it can be set as the easily peelable lid | cover material which enables lamination | stacking efficiently.
[0031]
Accordingly, the present invention is a lid material suitable for sealing and sealing the flange portion of the container body having an opening at the upper end and a flange portion at the upper end periphery, and in particular stores instant noodles and pours hot water. The lid material mainly composed of paper that seals and seals the opening of an eating container exhibits an excellent practical effect.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining an embodiment of a container to which a lid of the present invention is applied.
FIG. 2 is an explanatory view showing one embodiment of a lid member of the present invention in a side cross section.
FIG. 3 is an explanatory view showing, in a side cross-section, one embodiment of a sealant layer constituting the lid member of the present invention.
FIG. 4 is an explanatory view showing an example of a conventional lid member in a side section.
FIG. 5 is a perspective view for explaining an example of an opened state of a container to which a conventional lid material is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cover material 1a ... A part of cover material which remained in the flange part 2 ... Container body 10 ... Paper layer 11 ... Printing layer 12 ... Pull tab 15 for opening ... Sand polyethylene layer 20 ... Aluminum foil 21 ... Flange 30 ... Sealant layer 30a ... Sealant layer surface 32 ... Easy peelable resin layer 33 ... Adhesive resin layer 34 ... Polyester or polyamide resin layer 36 ... Polyethylene resin layer

Claims (2)

It is a laminated body that seals and seals the upper edge opening of the container body, and is a lid member having a tab for opening on the outer peripheral edge, the outermost layer being a paper layer, the intermediate layer being an aluminum foil, The sealant layer has a five-layer structure in which a polyethylene resin layer is provided on one side of a polyester resin layer or a polyamide resin layer, and an easily peelable resin layer is provided on the opposite side via an adhesive resin layer. A lid material comprising a co-extruded film, wherein a polyethylene resin layer surface of the sealant layer is bonded to the aluminum foil via a sand polyethylene layer formed by extrusion of polyethylene . Between the paper layer and the aluminum foil, lid according to claim 1, characterized in that it is bonded by extrusion lamination of polyethylene.

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