JP3917783B2 - Easy peelable lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid member that is sealed against a flange portion of a container that contains food or the like.
[0002]
[Prior art]
One example is described in Japanese Patent No. 2684205. The structure described in this publication is a lid provided with a first adhesive layer that bonds the inner and outer layers, and a second adhesive layer that bonds the inner layer and the flange portion of the container, and bonds the inner layer and the flange portion. The force is set larger than the adhesive force of the first adhesive layer, the adhesive force of the first adhesive layer is set larger than the tear force of the inner layer, and the tear force of the outer layer is more than the adhesive force of the first adhesive layer. Is a large structure.
[0003]
Japanese Patent Application Laid-Open No. 9-255034 discloses a cover material provided with a base material layer and a heat-adhesive resin layer provided on the back surface thereof and sealed against a flange portion. Annular slits are provided at positions corresponding to the inner and outer peripheries of the seal portion, and a release agent layer having a width substantially corresponding to the interval between the slits is interposed between the base material layer and the thermoadhesive resin layer. The structure is described.
[0004]
[Problems to be solved by the invention]
However, in the structure described in Japanese Patent No. 2684205, a structure that allows smooth separation of the lid and the container by a combination of tearing force between the outer layer and the inner layer and adhesive force between the first adhesive layer and the second adhesive layer. In addition, since the materials for each member and each part are restricted, there is a disadvantage that the cost as a whole increases.
[0005]
On the other hand, in the structure described in Japanese Patent Application Laid-Open No. 9-255034, since it is opened so as to be cut along the annular slit, there is an advantage that the appearance of the opening is improved, but the thermal adhesiveness Since the slit, which is a local weak spot in the resin layer, is connected to the release agent layer that promotes the peeling between the base material layer and the thermal adhesive resin layer, the thermal adhesive resin layer and the release agent layer There is a possibility that a fine gap communicating with the slit on the outer peripheral side is generated between them, that is, there is a disadvantage that a sufficient sealing performance cannot always be obtained.
[0006]
In addition, in the structure described in this publication and the structure described in the above-mentioned Japanese Patent No. 2684205, when the contents are heated using a microwave oven, the lid is opened using any means such as an overcap after opening. There is an inconvenience that the contents must not be scattered outside the container during heating.
[0007]
The present invention has been made in view of the above, the sealing property is high and easily opened peeled to, further overcap etc. unnecessary at the time of heating, easily peelable opening of opened after heating The purpose is to provide a lid.
[0008]
[Means for Solving the Problem and Action]
In order to achieve the above object, an invention according to claim 1 is provided with an outer layer material having an outer edge contour capable of closing an opening end of a container, laminated on the outer layer material, and provided at the opening end. An inner layer material that is sealed in a state in which the opening end portion is closed with respect to the flange portion, and the easy peeling with the bonding strength between the inner layer material and the outer layer material set smaller than the adhesive strength between the inner layer material and the flange portion In the openable lid, the inner layer material is divided into a plurality of divided bodies, each divided body closes the opening end of the container and forms an abutting portion, and the abutting portion is formed in the container. Easy opening portions that open as the internal pressure increases are formed, and the divided bodies are each provided with a knob .
[0009]
Therefore, according to the invention of claim 1, first, the outer layer material is peeled off from the inner layer material. Since the bonding strength between the outer layer material and the inner layer material is set as described above, the inner layer material and the flange portion are not separated, and only the outer layer material is easily peeled off. It should be noted that the bonding strength between the outer layer material and the inner layer material does not correspond to the sealing performance as an easily peelable opening lid, and therefore the bonding strength can be set to the lowest value that can be practically used. The outer layer material can be easily peeled off.
[0010]
Here, for example, when the contents of the container are heated by a microwave oven, the container is accommodated in the above-described state in which only the outer layer material is peeled off. When the internal pressure of the container increases with heating, along with its easy-opening is formed in Butt portion of the divided bodies by the pressure is opened, the pressure through which flows out to the outside. Therefore, no damage or forced peeling due to excessive increase in internal pressure occurs, and the contents remain in the container without scattering. That is, heating in a microwave oven can be performed without using a member such as an overcap. Next, the heated contents can be taken out of the container by peeling the inner layer material from the flange portion.
[0011]
Also, with the inner layer material is divided into a plurality of divided bodies, and is characterized in that the easily opening I by the mating portion per each divided bodies are formed.
[0012]
Therefore after heating the container by peeling the plurality of divided bodies from the flange portion, the entire area of the opening end portion is opened completely exposed completed. Since the inner layer material is divided into a plurality of pieces in this way, the resistance force associated with the separation of each divided body is small, so even if the adhesive strength between the inner layer material and the flange portion is set high, the easy-release-open lid Can be easily peeled off. That is, it is possible to achieve both high sealing performance and good opening performance.
[0013]
In a further, the divided body, is characterized in that the tab is provided, respectively.
[0014]
Therefore, in order to grip portion of each divided body is clarified, even though hot is heated, operation for separating the respective divided unit becomes easier, easily separable openability with it The opening of the entire lid is further facilitated.
[0015]
Furthermore the invention described in claim 2, in addition to the invention described in claim 1, which before Kitsumami piece, characterized in that it is polymerized to the surface of the outer layer member side of the other divided member It is.
[0016]
Therefore, according to the invention of claim 2, there is no fear that the tab is pulled before peeling off the outer layer member, since each the tab while peeling off the outer layer material is exposed on the upper side of each divided body, each divided member The operation for peeling off becomes easy, and the opening as the whole easy peelable lid is further facilitated accordingly.
[0017]
Further, in the invention described in claim 3, in addition to the invention described in claim 2, the knob is not bonded to the other divided body or more than the adhesive strength between the inner layer material and the flange portion. It is characterized by being weakly bonded.
[0018]
Therefore, according to the third aspect of the present invention, since each knob has a substantially free end, it is easy to hold the knob and there is a possibility that the inner layer material and the flange portion may be separated at that time. Absent.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A specific example of the present invention will be described below with reference to the drawings. 1 to 6, reference numeral 1 denotes an easily peelable opening lid. As shown in FIG. 1, the easily peelable openable lid 1 is sealed by heat sealing with respect to the flange portion 3 in a state where the opening portion of the molded container 2 is closed. Therefore, the upper surface portion of the flange portion 3 is a seal region 4.
[0020]
As shown in FIG. 2, the forming container 2 includes a bottom wall portion 5 having a circular flat plate shape, a side wall portion 6 that rises outward from the peripheral edge portion of the bottom wall portion 5, and a peripheral edge portion of the side wall portion 6. And a flange portion 3 connected in parallel with the bottom wall portion 5 toward the outer peripheral side, and is made of polyethylene or polypropylene. That is, the flange portion 3 forms an annular flat plate. The molded container 2 contains contents (not shown) such as food or beverage.
[0021]
On the other hand, the easily peelable openable lid 1 is a sheet material that extends slightly outward from the outer peripheral edge of the flange portion 3 as a whole and has a shape and size that substantially follows the shape of the flange portion 3. A part of the outer peripheral edge of the easily peelable openable lid 1 is provided with a tab 7 for picking that has a larger amount of outward protrusion than other parts. The tab 7 has a shape that intersects two tangents that touch the outer peripheral edge of the flange portion 3.
[0022]
The easily peelable lid 1 includes an inner layer material 8 that is in contact with the flange portion 3 and an outer layer material 9 that is disposed outside the inner layer material 8. As an example, the inner layer material 8 and the outer layer material 9 are laminated in the whole area except for the tip portion of the tab 7. In other words, only the tip portion of the tab 7 in the easy-peelable openable lid 1 is a non-adhesive region.
[0023]
First, the outer layer material 9 will be described in detail. The outer layer material 9 has a three-layer structure in which the surface layer 10, the intermediate layer 11, and the back layer 12 are laminated in this order from the outside (opposite the surface contacting the inner layer material 8). It is made. The surface layer 10 which is a surface base material consists of a polyester film, a polypropylene film, a polyethylene film, etc. whose thickness was set to 12 micrometers-45 micrometers as an example.
[0024]
On the other hand, the intermediate layer 11 as a barrier material is an aluminum foil set to a thickness of 12 μm to 30 μm, and is laminated on the surface layer 12 by a method such as extrusion lamination, hot melt lamination, or dry lamination. Backing layer 12 in the outer layer member 9 is made of an adhesive polyester coated with the intermediate layer 11, the coating amount is set to 3g / m ² ~10g / m ² as an example.
[0025]
On the other hand, the inner layer material 8 is a laminated film in which a surface layer 13 in surface contact with the back layer 12 of the outer layer material 9 and a back layer 14 bonded to the flange portion 3 are laminated, and has a two-part structure. . That is, as shown in FIG. 3, the entirety is formed in a circle larger than the flange portion 3 and is divided at the center portion, and one divided piece 15 is provided with a protruding portion having a shape corresponding to the tab 7.
[0026]
More specifically, each of the divided bodies 15 and 16 has an outer surface facing a part of the outer peripheral edge so that the inner layer material 8 sealed by the flange portion 3 passes over the center point of the bottom wall portion 5. The structure is such that a part of the peripheral edge is cut in a straight line, further cut from there in a direction substantially parallel to the outer peripheral edge, and then cut substantially at a right angle toward the outer peripheral edge. Accordingly, the divided bodies 15 and 16 are opposed to each other in a state where the linear cut end surfaces 19 and 20 extending from a part of the outer peripheral edge to the vicinity of a part of the opposed outer peripheral edge are in contact with each other. The pair of cut end surfaces 19 and 20 corresponds to the easy opening portion of the present invention.
[0027]
Each of the divided bodies 15 and 16 is provided with knobs 17 and 18 having a shape similar to a rectangle or a rectangle in the vicinity of one outer peripheral edge. The top edge of the divided body 15 arranged on the right side in FIG. 3 is provided with a knob 17 projecting toward the left side in the figure, and the divided body 16 arranged on the left side with respect to this. At the lower edge portion of the knives, there is provided a knob 18 projecting toward the right side in the figure.
[0028]
Each of the knobs 17 and 18 is disposed on the upper portion of the flange portion 3 so as to partially overlap the seal area 4. Further, as shown in FIG. 4, the knobs 17 and 18 are overlapped in a state of surface contact with the upper surface portions of the other divided bodies 16 and 15. The knobs 17 and 18 and the divided bodies 16 and 15 are not bonded. On the other hand, the upper surface portions of the knobs 17 and 18 are bonded to the back layer 12 of the outer layer material 9. Note each the tab 17, 18 may be any structure capable of picking short easily, thus for example not adhere against the predetermined width divided bodies 16 and 15 at the edges of each the tab 17, 18, may the inner portion as a structure for adhering by a weak adhesive force for the divided bodies 16 and 15.
[0029]
As an example, the surface layer 13 in the inner layer material 8 employs a polyester film having a thickness of 12 μm to 20 μm. On the other hand, the back layer 14 in the inner layer material 8 is made of a polypropylene film or a polyethylene film set to a thickness of 30 μm to 80 μm, and the one corresponding to the material of the target molding container 2 is adopted from these. Yes. Any material is a material that is not thermally bonded to the surface layer 13, and thus the back layer 14 and the surface layer 13 in the inner layer material 8 are selected so as not to be thermally bonded to each other.
[0030]
The tearing force of the inner layer material 8 is set larger than the tearing force of the outer layer material 9. Further, no slit that induces or promotes the breakage of the inner layer material 8 is formed at any position on the inner and outer circumferences of the seal region 4 in the inner layer material 8. Further, the adhesive strength between the back layer 14 and the flange portion 3 in the inner layer material 8 is set to be larger than the bonding strength between the surface layer 13 and the outer layer material 9 in the inner layer material 8. In other words, the bonding strength between the inner layer material 8 and the outer layer material 9 is set to be smaller than the adhesive strength between the inner layer material 8 and the molded container 2. That is, the outer layer material 9 alone can be reliably peeled from the inner layer material 8 without peeling the inner layer material 8 from the flange portion 3.
[0031]
Next, the operation of the present invention configured as described above will be described. First, when the sealing performance against the internal pressure of the molded container 2 is examined, when pressure is applied from the inside of the molded container 2 to the easily peelable openable lid 1, the easy peelable openable lid 1 is peeled as shown in FIG. Although the force F causing the above acts, the width of the seal region 4 is wide, and the adhesive strength by JIS (Z0238: 2.3 kg / 15 mm width or more) is sufficient, so the peeling is Does not occur. Thereby, sufficient sealing performance can be ensured.
[0032]
Here, when the molded container 2 in a state of being completely sealed by the easily peelable openable lid 1 is opened, the tab 7 is first picked to peel the outer layer material 9 from the inner layer material 8. As described above, the laminate strength between the inner layer material 8 and the outer layer material 9 does not correspond to the adhesive strength with respect to the molded container 2 as the easily peelable openable lid 1, that is, the sealing ability. It is possible to set the laminate strength to a minimum value that can withstand practical use, and therefore, the outer layer material 9 can be peeled smoothly.
[0033]
Next, the molded container 2 is accommodated in, for example, a microwave oven in the above state where only the outer layer material 9 is peeled off, and the contents are heated. Since the pressure inside the molding container 2 that rises with heating flows out from the gap while widening the interval between the cut end faces 19 and 20 of the divided bodies 15 and 16, the internal pressure of the molding container 2 is excessive. Forcible opening or partial breakage of the easily peelable openable lid 1 due to the increase does not occur, and scattering of the contents accompanying it is prevented in advance. Prevention The holder halves 15 and 16, from the point which is substantially closed but state opening portion consisting of a side wall portion 6 of the molded container 2 also, that the contents are scattered to the outside of the molded container 2 Is done. Therefore, another member such as an overcap is unnecessary.
[0034]
After the heating is completed, the molded container 2 is taken out from the microwave oven, and for example, when the knob 17 is gripped and moved so as to be pulled in the direction along the seal region 4, the divided body 15 formed integrally therewith is formed. It peels from the flange part 3 with the progress. As the opening progresses along with this, the right side half of the molded container 2 is opened as shown in FIG. And while grasping the other knob | pick piece 18, it moves like the above and peels off the corresponding division body 16. FIG. As a result, the molded container 2 is completely opened. Since each of the knobs 17 and 18 is not bonded to the lower divided bodies 15 and 16 and is a so-called free end, it can be easily gripped.
[0035]
As described above, each of the knobs 17 and 18 forms a part of the outer peripheral edge of the inner layer material 8, and the separation of the divided bodies 15 and 16 proceeds in one direction along the seal region 4. The resistance force against this is small, so that a large pulling force is unnecessary, and as a result, it can be opened easily and smoothly. Moreover, there is no fear that a part of the inner layer material 8 breaks and remains in the flange portion 3 or the seal area 4 becomes rough, and the opening portion looks good.
[0036]
Thus, according to the easily peelable openable lid 1 having the above-described structure, it is possible to release the internal pressure in a state where the substantially entire opening portion of the molded container 2 is covered by peeling only the outer layer material 9. In addition, since the inner layer material 8 and the outer layer material 9 can be easily separated from each other, it can be heated in a microwave oven without using an overcap or the like, that is, adaptability to the microwave oven is improved. Can be made.
[0037]
Moreover, in said easily peelable opening lid | cover 1, since it is comprised so that peeling of each division 15 and 16 from the flange part 3 may advance only to one direction in the seal | sticker area 4, the inner layer material 8 and the flange part 3 are comprised. Even if the adhesive strength is set to be high, the inner layer material 8 can be easily and smoothly peeled off, whereby both high sealing performance and excellent opening performance can be obtained. Furthermore, in the above-described easily peelable openable lid 1, each member can be made of a material that is generally employed in the past, and therefore, there is an advantage that the cost does not increase.
[0038]
In the above specific example, a pair of cut end faces are illustrated as the easy opening, but the present invention is not limited to the above example, and other structures of the easy opening are not connected to, for example, the outer periphery. It may be a spiral cut or a broken line formed so as to connect the inner peripheral edges of the seal area. Furthermore, in the above specific example, the structure in which the inner layer material and the outer layer material are laminated in the entire area excluding the tab is exemplified. However, the present invention is not limited to this. For example, the inner peripheral side range of the seal area is not laminated, A structure in which only the range along the side is laminated may be used.
[0039]
【The invention's effect】
As described above, according to the first aspect of the present invention, the outer layer material having a size capable of closing the opening end of the container and the laminated outer layer material are sealed in a state in which the opening end is closed with respect to the flange portion. It is an easily peelable openable lid that has an inner layer material and the bonding strength between the inner layer material and the outer layer material is smaller than the adhesive strength between the inner layer material and the flange portion, and the inner layer material increases the internal pressure of the container. with partially have been easy opening formed by Butt portion of the divided bodies you prior to opening than the other portion, the substantial entire region of the open end portion in a state capable of flowing out of the internal pressure of the container Since the structure is closed, for example, heating in a microwave oven can be performed without using a covering member such as an overcap, that is, adaptability to the microwave oven can be improved.
[0040]
Also, the inner layer material be composed of a plurality of divided bodies, because substantial resistance force caused by peeling of the entire inner layer material is reduced, easily set high adhesion strength between the inner layer member and the flange portion Therefore, it is possible to obtain an easily peelable opening lid that has both easy peelability and complete sealability.
[0041]
Further, the since the tab to facilitate the peeling of each divided body is provided, even though hot is heated, it is possible to perform the opening as a whole even more easily.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a part of an easily peelable openable lid attached to a molded container.
FIG. 2 is a cross-sectional view showing an easily peelable openable lid and a molded container.
FIG. 3 is a schematic diagram showing an arrangement relationship between a pair of divided bodies.
FIG. 4 is a schematic view showing a positional relationship between a knob and a divided body.
FIG. 5 is a schematic view showing a state in which the internal pressure of the molding container acts on the easily peelable openable lid.
FIG. 6 is a schematic view showing a state in which one divided body is removed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Easy peeling openable lid, 2 ... Molding container, 3 ... Flange part, 4 ... Sealing area, 8 ... Inner layer material, 9 ... Outer layer material, 15, 16 ... Divided body, 17, 18 ... Picking piece, 19, 20 ... cut end face.

Claims (3)

An outer layer material having an outer edge contour capable of closing the opening end of the container, and an inner layer material laminated to the outer layer material and sealed in a state in which the opening end is closed with respect to a flange portion provided at the opening end. In the easily peelable opening lid in which the bonding strength between the inner layer material and the outer layer material is set smaller than the adhesive strength between the inner layer material and the flange portion,
The inner layer material is divided into a plurality of divided bodies, and each divided body closes the opening end of the container and forms a butt portion,
The butt portion forms an easy opening that opens as the internal pressure of the container increases,
Each segment is provided with a knob.
An easily peelable openable lid characterized by that. Peelable opening of the lid according to claim 1, before Kitsumami piece, characterized in that it is polymerized to the surface of the outer layer member side of the other divided member. Before Kitsumami piece, easy peel openability according to claim 2, characterized in that it is bonded weaker than the adhesive strength with respect to the other divided member and non-adhesive or said inner member and said flange portion lid.

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