JP4407051B2 - Lid material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cover material mainly composed of paper suitable for sealing a container body having an opening at the upper end and a flange at the upper edge, and does not particularly include an aluminum foil constituting the cover. It is related with the cover material of a structure.
[0002]
[Prior art]
Conventionally, for example, a container that stores instant noodles, instant soup, etc., and has a paper layer as a lid mainly composed of paper that seals a container body having an opening at the upper end and a flange at the upper end periphery with a seal or the like. It is known that an aluminum foil and a sealant layer are laminated on the lower surface of the steel sheet. When opening the lid, the lid material sealed on the flange part is peeled off to the substantially central part while lifting the tab on the periphery, and the above aluminum The lid with a foil intervening has the property of maintaining the peeled state (hereinafter referred to as dead hold), so it can be peeled off with instant noodles, and hot water can be poured easily in a half-open state. Then, the lid was once covered to loosen and soften the noodles, and then half-opened again so that they could be eaten even in that state. Moreover, in instant miso soup, hot water was poured in a half-open state, and it was easy to eat and drink in that state.
[0003]
[Problems to be solved by the invention]
However, in the lid material having the above-described configuration, there has been a problem that, in the incineration process after use, the aluminum foil is entangled as an ingot in the furnace and damages the incinerator or reduces the incineration efficiency. In addition, the landfill disposal of the incineration ash has problems such as generation of harmful gases due to reaction with rainwater.
[0004]
Furthermore, the inclusion of aluminum foil in the lid material makes it impossible to use a metal detector that inspects the mixing of metal-based chips etc. in the container in which the contents are stored. The law was demanded.
[0005]
The present invention solves the problems and demands of the prior art, and the subject is a material that does not use aluminum foil, which has a concern about environmental problems related to waste, and is sufficient. It is providing the cover material which has a dead hold property.
[0006]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, first, in the invention of claim 1, in the lid member having a tab on the periphery, which seals the opening part of the container body having an opening part at the upper end, the lid material has a basis weight. a paper layer of 75g / m 2 ~120g / m 2 , made of a laminated structure in which a sealant layer having a thickness of 20μm~60μm the back surface of the paper layer is provided, or the sealant layer to the sealant layer and the paper layer back surface A cover material characterized by being provided with a plurality of cut lines extending from the tab to at least a substantially central portion of the cover material, which extends in the direction orthogonal to the tab to the middle.
[0007]
According to the first aspect of the present invention, the basis weight of the paper layer constituting the cover material and the thickness of the sealant layer are specified within a certain range without interposing an aluminum foil having a risk of environmental problems related to waste. However, a plurality of score lines extending in the direction orthogonal to the direction of peeling with the tabs applied to the sealant layer bends along the score lines, and the paper layer that is relatively easy to bend is bent. It comes to express.
[0008]
According to a second aspect of the present invention, the lid material according to the first aspect is characterized in that the direction in which the cut line extends and the grain direction of the paper layer are the same.
[0009]
According to the second aspect of the invention, the paper layer constituting the lid member is easy to bend according to the paper pattern and easily curl, so that in addition to the dead-holding property due to the score line, a more sufficient dead Hold characteristics are developed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in the perspective view of FIG. 1, the present invention relates to a lid member (10) for sealing an opening of a container body (10) having an opening made of a flange (12) at the upper end, for example, The lid member (20) has a tab (22) for picking with a finger when opening at the periphery, and is sealed to the flange portion (12) of the container body (10) by heat sealing or the like.
[0011]
The cover material of the present invention (20), as shown in the side cross-sectional schematic view of FIG. 3, a paper layer having a basis weight of 90g / m 2 ~120g / m 2 (24), the lower surface of the paper layer (24) 2 is provided with a sealant layer (26) having a thickness of 20 μm to 60 μm, and the sealant layer (26) has a direction orthogonal to the direction of the tab (22) as shown in the rear view of FIG. A plurality of score lines (30) extending in the direction are provided, and the score lines (30) may be on the front surface of the lid material (20), but at least from the tab (22) to the substantially central portion of the lid material. I just need it. Moreover, it is preferable not to give to the part sealed by the flange part of a container main body in the periphery vicinity of a cover material (20). This is because when the lid member (20) is peeled off, it may be broken from the cut line (30) at that portion.
[0012]
Further, the cut line (30) is applied to the sealant layer (26) with a cutter or the like, leaving the paper layer (24) as shown in FIG. 3, but the lid material (20) is applied as shown in FIG. The paper layer (24) may be half-cut (32) to such an extent that it does not break. Especially when the paper layer (24) is thick (basis weight is large), the half-cut (32) should be given. Since it becomes easy to bend | curve from this half cut (32), it is preferable for the expression of dead hold property.
[0013]
The cut line (30) and the half cut (32) may be straight as shown in FIG. 2, or may be sawtooth or corrugated as shown in FIG. As described above, the degree of dead hold property can be controlled by selecting the shape, depth, line interval (line width), and the like.
[0014]
Furthermore, as shown in FIG. 2, the cut line (30) and the half cut (32) are the same in the direction in which the cut line (30) extends and the paper grain direction (P) of the paper layer. As a result, it is possible to contribute to the development of sufficient dead hold property in addition to the dead hold property due to the cut line, from the property that the paper layer is easily bent according to the grain and the property that it is easily curled.
[0015]
The paper layer constituting the cover material of the present invention (20) (24), preferably has a multicolor printability at least the surface is a white, basis weight 75g / m 2 ~120g / m 2 about both art paper A piece of art paper or coated paper can be preferably used.
[0016]
Moreover, as the sealant layer (26) laminated on the back surface of the paper layer (24), low density polyethylene, high density polyethylene, and unstretched polypropylene excellent in heat sealability are preferably used. By mixing incompatible components such as polystyrene and polybutene, sufficient sealing performance with the flange portion (12) of the container body (10) and peel-opening capability can be achieved.
[0017]
Further, as shown in FIG. 3, an intervening resin layer (26a) may be provided for the purpose of improving the interlayer adhesive strength between the sealant layer (26) and the paper layer (24) and maintaining the opening of the lid. it can. As the intervening resin layer (26a), either ethylene and an α-, β-unsaturated carboxylic acid copolymer or an ionic cross-linked product of the above-mentioned copolymer are suitable. Specifically, an ionomer resin, an ethylene-acrylic acid copolymer is used. Examples thereof include a polymer and an ethylene-methacrylic acid copolymer, and the thickness of the intervening resin layer (26a) may be 10 μm to 40 μm, and the total thickness with the sealant layer (26) may be 20 μm to 60 μm.
[0018]
As shown in FIG. 7, the opening of the container such as instant ramen using the lid member (20) having the above-described configuration is performed by picking up the tab (22) with a finger and lifting the flange ( 12) to the cover material (20) is peeled off to its substantially central portion. At this time, the lid material (20) is maintained in an upward curled state according to the cut line (30) applied to the back surface, and hot water is poured from the opening (14) in the same manner as the conventional aluminum foil-covered lid material. It is easy to eat and drink in that state, and there is an effect that hot water does not easily spill even when eating and drinking while standing. Moreover, even when it is set as the lid | cover material (20) of the container for jelly-like confectionery or a yogurt, it can be made easy to eat with the lid | cover material (20) in the state opened halfway.
[0019]
【Example】
Next, an Example demonstrates this invention concretely.
<Example 1>
Using a piece of art paper with a basis weight of 79.1 g / m 2 , a low-density polyethylene resin is extruded and laminated to a thickness of 15 μm on the back surface of the paper layer (24) printed on the front surface (coated surface), and further an intervening resin An ethylene-methacrylic acid copolymer is extruded to a thickness of 20 μm as a layer (26a), and a sealant layer (26) made of low-density polyethylene and an incompatible component polybuden is formed thereon by extrusion. A circular lid member (20) having a diameter of 100 mm and having a tab (22) was obtained.
[0020]
A straight score line (30) extending from the back surface of the lid (20) obtained above to the sealant layer (26), the intervening resin layer (26a) and the low density polyethylene layer in a direction perpendicular to the direction of the tab (22). ) Was applied at intervals of 6 mm from the tab (22) to the substantially central portion.
[0021]
The sealant layer (26) surface of the lid material (20) with the score line (30) obtained as described above has a diameter of 100 mm of the opening (14) in which polyethylene of 25 μm thickness is laminated on the inner surface of paper. A container with a lid was obtained by sealing at a temperature of 140 ° C. to the flange part (12) of a paper container main body (10) having a height of 110 mm and a flange part (12) of 3 mm width.
[0022]
In order to evaluate the dead hold property of the lid member (20), the tab (22) is released from the tab (22) to the substantially central portion, then the tab (22) is released, and the distance between the tab (22) tip and the flange portion (12). As a result, the distance was 30 mm. In this state, hot water could be easily poured. In the case of eating and drinking, this distance can be increased by intentionally curling upward, and eating and drinking can be easily performed in this state.
[0023]
【The invention's effect】
Since this invention is the above structure, there exist the following effects.
That is, to seal the opening of the container body having an opening at the upper end, the cover member having a tab on the periphery, and paper lid material having a basis weight of 75g / m 2 ~120g / m 2 layer, the paper layer And a cut line extending in a direction perpendicular to the tab is formed in the sealant layer or halfway between the sealant layer and the paper layer back surface. By making it applied to at least approximately the center part, it is possible to make a lid material excellent in dead hold property similar to a lid material intervening a conventional aluminum foil, and it is easy to pour hot water from the opening of the container And it can make it easy to eat and drink in that state.
[0024]
Furthermore, since there is no aluminum foil like the conventional lid material, there is no environmental problem related to waste, and it is possible to use a metal detector for the inspection of the presence of metal debris in the container. it can.
[0025]
Moreover, it can be set as the lid | cover material which was more excellent in dead hold property by making the extending direction of the said score line, and the paper grain direction of a paper layer the same.
[0026]
Therefore, the present invention exhibits excellent practical effects in applications such as instant noodles, instant soups, jelly-like confectionery, and lids for containers such as yogurt.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining an embodiment of a container to which a lid member of the present invention is applied.
FIG. 2 is a schematic explanatory view showing an embodiment of a lid member of the present invention, as viewed from the back side.
FIG. 3 is a schematic explanatory view showing an embodiment of the lid member of the present invention in a side cross section.
FIG. 4 is a schematic explanatory view showing another embodiment of the lid member of the present invention in a side cross section.
FIG. 5 is a schematic explanatory view showing another embodiment of the lid member of the present invention as seen from the back side.
FIG. 6 is a schematic explanatory view showing another embodiment of the lid member of the present invention in a side cross section.
FIG. 7 is a perspective view for explaining an example of an opened state of a container to which the lid of the present invention is applied.
[Explanation of symbols]
10 ... Container body 12 ... Flange 14 ... Opening 20 ... Lid 22 ... Tab 24 ... Paper layer 26 ... Sealant layer 26a ... Intervening resin layer 30 ... Cut line 32 ... Half cut 50 ... Printing layer P ... Direction of paper

Claims (1)

The lid having a tab at the periphery, sealing the opening of the container main body having an opening at the upper end, the lid is a laminated structure in which a paper layer and a sealant layer are provided on the back surface of the paper layer, A direction orthogonal to the direction of peeling with the tabs on the sealant layer or in the middle of the sealant layer and the paper layer, in the vicinity of the periphery of the lid, excluding the portion sealed by the flange portion of the container body cut line is being subjected extending, lid you wherein the paper grain direction of the direction and the paper layer of extension of the cut line are the same.

Images