JP3772564B2 - Lid material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid material suitable for sealing a container body having an opening at the center and a flange at the periphery, and in particular, a lid material that does not include an aluminum foil in the material constituting the lid material. It is.
[0002]
[Prior art]
For example, a container for storing instant noodles, instant soup, etc., with a sealant layer on the lower surface of a laminated material using a paper layer and aluminum foil as a lid for sealing the container body having an opening in the center and a flange in the periphery Since the lid material with the structure has the property of maintaining the opened state (hereinafter referred to as dead hold property), it is possible to pour hot water as it is.
[0003]
On the other hand, when a lid material using an aluminum foil is subjected to an incineration process after use, the aluminum foil remains as a lump, which may damage the incinerator.
In this way, due to the problem of processing after use, a lid member in which the aluminum foil is removed from the lid member has been proposed, but since it does not have sufficient dead hold property, it has not been put into practical use.
[0004]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a lid material having a sufficient dead hold property even if it is a lid material made of a material that does not use an aluminum foil.
[0005]
[Means for Solving the Problems]
The invention, of the container body having an opening, the lid member for sealing the opening, the lid member is a basis weight and paper layer ranging ^{90g / m 2 ~120g / m 2} , of the paper layer on the lower surface, in a stacked configuration thickness provided with a sealant layer of 20μm~60μm through intervening resin layer, and opening strength of the unsealing start of the container body, 600g / 30mm~1300g / 30mm, the container body peel strength after open trigger is Ri range der of 200g / 3mm~500g / 3mm, the intermediate resin layer, any of ethylene and alpha, beta-unsaturated carboxylic acid copolymer, or ionic crosslinking of the copolymer It is a cover material characterized by consisting of a kind .
[0006]
The invention according to claim 2 is the lid material, wherein the sealant layer is made of a thermoplastic resin containing an incompatible component having an aspect ratio in the range of 1.5 to 10. The invention according to claim 3 is the lid member characterized in that in the sealant layer, the thermoplastic resin is provided so that the longitudinal direction of the incompatible component is parallel to the opening direction of the lid. According to a fourth aspect of the present invention, the sealant layer is made of a hot melt resin .
[0007]
The invention according to claim 5 is the lid member characterized in that the opening direction of the lid member is the grain direction of the paper layer constituting the lid member. The invention according to claim 6 is a lid material characterized in that an opening tab is provided at an opening start portion of the lid material.
[0008]
The invention according to claim 7 is a lid material, wherein a printed layer is provided on a surface of the paper layer.
[0009]
[Action]
The lid material of the present invention has a structure in which the basis weight of the paper layer, the opening strength of the sealant layer and the opening of the container body are specified within a certain range, so that when the lid material is opened, a constant dead hold is obtained. Sex can be expressed.
Here, when the opening strength at the start of opening is less than 600 g / 30 mm, the dead-old property is insufficient, and a constant opening state cannot be maintained, and when it exceeds 1300 g / 30 mm, the opening strength is too strong, Opening may be difficult or the lid may be torn.
Further, by specifying the material and thickness of the intervening layer, more excellent dead hold property can be exhibited, and the content filling machine suitability is excellent, and the lid opening suitability can be obtained.
Furthermore, by making the opening direction of the lid material from the container main body the same as the grain direction of the paper layer constituting the lid material, it is possible to exhibit a more excellent dead hold property.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view showing an example of a lid member, and FIGS. 2 and 3 are cross-sectional views showing an example of the lid member of the present invention.
The arrow in FIG. 1 indicates the grain direction of the paper layer 20 constituting the lid member 10 and is provided with a tab 11 for opening at the opening start portion. Specifically, the opening direction and the paper grain are in the same direction. And it is set as the structure which provided the tab 11 for opening in the opening start part.
Specific configuration of the lid 10, as shown in FIG. 2, a basis weight of the lower surface of 90g / m ² ~120g / m ² in the range of the paper layer 20, provided with a sealant layer 22 having a thickness of 20μm~60μm It is a cover material of a laminated structure.
Further, as shown in FIG. 3, the cover material is provided with an intervening resin layer 23 between the sealant layer 22 and the paper layer 20 shown in FIG.
Then, a print layer 21 for displaying contents, a pattern, or the like may be provided on the surface of the paper layer 20.
In addition, it is good also as a structure which provides light-shielding property and provides a printing layer on the back surface of a paper layer for the protection of the content.
[0011]
Here, when the thickness of the paper layer used for the lid material is less than 90 g / m ² , the paper layer is weakly repelled and can exhibit a dead hold property, but may be peeled off when opened. This is not preferable.
Also, in order to prevent paper peeling, the sealing strength with the container body must be reduced, so that sufficient sealing performance cannot be maintained, causing a practical problem.
[0012]
On the other hand, if the thickness of the paper layer used for the cover material exceeds 120 g / m ² , even if fine embossing or fine punching is performed, the repulsive force of the paper layer is large, and the opened state can be maintained. In other words, it returns to its original state, and sufficient dead hold property cannot be exhibited, and hot water cannot be poured as it is.
[0013]
The sealant layer 22 is not particularly limited as long as it is a resin that can exhibit dead hold properties in a state of being laminated on the paper layer 10 and has a thickness, but is preferably a thermoplastic resin such as polyethylene or polypropylene, and has a thickness of 20 μm to 60 μm. It is preferable to set it as the range.
By using the resin and the thickness, the sealing property can be maintained, and the paper can be opened cleanly without causing paper peeling at the time of opening.
The sealant layer may be made of hot melt resin that can be sealed at a low temperature, in addition to the above resin.
[0014]
Furthermore, the sealant layer 22 has a sufficient sealing property with the opening of the container body by mixing the incompatible component 24 with a thermoplastic resin such as polyethylene or polypropylene having an aspect ratio in the range of 1.5 to 10. Excellent openability becomes possible.
As the incompatible component 24, polystyrene, polybutene, or the like is suitable. The resin is melt-molded so that the longitudinal orientation of the incompatible component extends in the flow direction of the sealant layer 22, and the paper to be laminated By making it the same direction as the grain of the layer, more excellent dead hold property can be exhibited.
[0015]
Here, as shown in FIG. 3, an intervening resin layer 23 may be provided between the sealant layer 22 and the paper layer 24. In this case, as the intervening resin layer 23, either ethylene and an α, β unsaturated carboxylic acid copolymer or an ionic cross-linked product of the copolymer is suitable. Specifically, an ionomer resin, an ethylene-acrylic acid copolymer is used. Polymer (hereinafter referred to as EAA) and ethylene-methacrylic acid copolymer (hereinafter referred to as EMAA). The thickness of the intervening resin layer is in the range of 10 to 40 μm, and the total thickness with the sealant layer 22 is 20 to 60 μm. A range may be used.
[0016]
Further, as shown in FIG. 1, it is preferable that the opening tab is provided in a position that is in the same direction as the opening direction and the paper grain. You may provide in the direction which shifted | deviated in the range of 45 degrees.
Further, the structure of the tab 11 is not particularly limited as long as it has a function of being easily picked and opened at the start of opening.
As shown in FIG. 4, the insertion piece 42 is provided on the tab 11 so as to extend in the circumferential direction via the fold line 41, thereby opening the lid material and pouring hot water. The opening can be resealed by folding it under the tab 11 from the fold line 41 and inserting it under the flange of the container body.
[0017]
【Example】
[Example 1]
100 g / m ² basis weight at the opening of a paper container body (opening diameter 100 mm, container height 110 mm, flange width 3 mm) with paper as a base material and polyethylene (thickness 25 μm) laminated on the inner surface An intervening resin layer (thickness 25 μm) and a sealant layer (thickness 25 μm) having the following composition are provided on the lower surface of the paper layer, and a tab (width of opening start portion 30 mm) is opened at the opening start portion in the same direction as the paper. The lid material provided with was sealed at 120 ° C., 140 ° C., and 150 ° C., respectively, and the opening strength at the start of opening and after the start of opening was measured.
(Sealing condition: sealing pressure 1.8 kg / cm 2, sealing time 1 second, opening condition: opening strength tensile speed 300 mm / min)
The intervening resin layer was an ionomer resin, and the sealant layer was tested using polyethylene mixed with polybutene as an incompatible component.
As a result, the opening strength at the start of opening was 600 g / 30 mm when the seal temperature was 120 ° C., 875 g / 30 mm when the seal temperature was 140 ° C., and 1225 g / 30 mm when the seal temperature was 160 ° C.
In this opening strength, the lid material was not torn and the inner surface of the container main body was removed, so-called paper peeling did not occur, and the opening between 800 g / 30 mm and 1200 g 30 mm was particularly good.
The opening strength after opening was 200 g / 3 mm when the seal temperature was 120 ° C., 400 g / 3 mm when the seal temperature was 140 ° C., and 500 g / 3 mm when the seal temperature was 160 ° C.
In order to evaluate the dead hold property, after opening from the tip of the tab to the center of 48 mm, the tab was released, and the distance from the tip of the tab to the opening of the container was measured. As a result, the lid material sealed at 120 ° C has a distance of 27.2 mm, the seal material at 140 ° C has a distance of 30.1 mm, and the seal material at 160 ° C has a distance of 30.4 mm. It was.
[0018]
[Example 2]
In the configuration of the lid material used in Example 1, the position of providing the tab was changed to 0 °, 45 °, and 90 ° with respect to the grain of the paper layer, respectively, and the lid material was created and sealed at 140 ° C. Done and sealed. (Sealing conditions are the same as in Example 1)
Each of the tabs was opened from the tip of the tab to the center of 48 mm, then the tab was released, and the distance between the tip of the tab and the opening of the container was measured, and a dead hold test was performed. (Opening conditions are the same as in Example 1)
The tab position was 30.3 mm for a 0 ° lid, 28.1 mm for a 45 ° lid, and 20.0 mm for a 90 ° lid. (Average of 10)
Parallel to the paper).
As a result, it was confirmed that the direction of opening in the same direction as possible with respect to the grain of the paper layer of the lid material was excellent in dead hold property.
[0019]
【The invention's effect】
As described above, the present invention can achieve a constant dead hold even in a cover material having a laminated structure that does not use an aluminum foil by setting the thickness of the paper layer constituting the cover material and the opening strength at the start of opening to a certain range. And can be used as a lid material for sealing the opening, and is suitable as a lid material for instant noodles, instant soups, and the like.
Moreover, it can be set as the cover material which was more excellent in dead hold property by making the opening direction the same direction as the direction of the paper grain of the paper layer which comprises a cover material.
Thereby, since it becomes a lid | cover material of the structure which does not use aluminum foil, use of the metal detector which test | inspects whether the metal piece is mixed is attained, and safety | security can be improved.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a lid member of the present invention.
FIG. 2 is a cross-sectional view of a laminated structure showing an example of a lid member of the present invention.
FIG. 3 is a cross-sectional view of a laminated structure showing another example of the lid member of the present invention.
FIG. 4 is a front view showing another example of the lid member of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Cover material 11 ... Tab 20 ... Paper layer 21 ... Print layer 22 ... Sealant layer 23 ... Interposition resin layer 24 ... Incompatible component 41 ... Folding line 42 ... Insert piece

Claims (7)

The container body having an opening, the lid member for sealing the opening, the lid comprises a paper layer ranging basis weight of ^{90g / m 2 ~120g / m 2} , on the lower surface of the paper layer, interposed Peeling after the opening of the container body starts with a laminated structure in which a sealant layer having a thickness of 20 μm to 60 μm is provided through the resin layer , and the opening strength at the start of opening with the container body is 600 g / 30 mm to 1300 g / 30 mm. Strength is in the range of 200 g / 3 mm to 500 g / 3 mm, and the intervening resin layer is made of ethylene and an α, β unsaturated carboxylic acid copolymer, or an ionic cross-linked product of the copolymer. Characteristic lid material. The lid material according to claim 1, wherein the sealant layer is made of a thermoplastic resin containing an incompatible component having an aspect ratio in a range of 1.5 to 10. The lid material according to claim 2 , wherein in the sealant layer, the thermoplastic resin is provided so that the longitudinal direction of the incompatible component and the opening direction of the lid are parallel to each other. The lid material according to claim 1, wherein the sealant layer is made of a hot melt resin. The lid material according to any one of claims 1 to 4 , wherein an opening direction of the lid material is a grain direction of a paper layer constituting the lid material. The lid material according to any one of claims 1 to 5 , wherein an opening tab is provided at an opening start portion of the lid material.   The lid material according to any one of claims 1 to 6, wherein a printing layer is provided on a surface of the paper layer.

Images