JP2001019039A - Easy peelable lid - Google Patents

Abstract

(57) [Problem] To provide an easily peelable openable lid sealed to a flange portion of a food container or the like, improve both the sealing property and the opening property, and further obviate the need for an overcap at the time of heating. An outer layer material (9) large enough to close an open end of a container (2), laminated on the outer layer material (9), and sealed to a flange (3) at the open end so as to close the open end. The easily peelable openable lid 1 including the inner layer material 8, wherein the bonding strength between the inner layer material 8 and the outer layer material 9 is set smaller than the adhesive strength between the inner layer material 8 and the flange portion 3. The inner layer material 8 is formed with easy openings 19 and 20 that partially open ahead of other portions with an increase in the internal pressure of the container 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material sealed to a flange of a container for storing foods and the like.

[0002]

2. Description of the Related 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 for adhering the inner and outer layers and a second adhesive layer for adhering the inner layer and the flange portion of the container. The force is set to be greater than the adhesive force of the first adhesive layer, the adhesive force of the first adhesive layer is set to be greater than the tear force of the inner layer, and the tear force of the outer layer is greater than the adhesive force of the first adhesive layer. Is also a large set structure.

[0003] Japanese Patent Application Laid-Open No. 9-255034 discloses that
A cover material provided with a base material layer and a thermo-adhesive resin layer provided on the back surface thereof and sealed against the flange portion,
Annular slits are respectively provided at positions corresponding to the inner and outer peripheries of the seal portion in the heat-adhesive resin layer, and a release agent layer having a width substantially corresponding to the interval between the slits is formed between the base material layer and the heat-adhesive resin layer. Are described.

[0004]

However, the patent No. 2
The structure described in Japanese Patent No. 684205 is configured to allow a smooth separation between the lid member and the container by a combination of a tear force between the outer layer and the inner layer and an adhesive force between the first adhesive layer and the second adhesive layer. In addition, since the material for each member and each part is restricted, there is a disadvantage that the cost as a whole increases.

On the other hand, in the structure described in Japanese Patent Application Laid-Open No. 9-255034, the opening is opened so as to be cut along the annular slit. Since the slit, which is a local weak spot in the heat-adhesive resin layer, is connected to the release agent layer that promotes the separation between the base material layer and the heat-adhesive resin layer, the heat-adhesive resin layer and the release agent There is a possibility that a fine gap communicating with the slit on the outer peripheral side may occur between the layer and the layer,
That is, there is a disadvantage that sufficient sealing properties cannot always be obtained.

[0006] Further, 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 contents are both
There is an inconvenience that the lid must be covered with any means such as an overcap to prevent the contents from scattering to the outside of the container during heating.

The present invention has been made in view of the above points, and has a high sealing property, and can be easily peeled off and opened.
It is another object of the present invention to provide an easily peelable opening lid that does not require an overcap or the like during heating.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 is characterized in that an outer layer material having an outer edge contour capable of closing an open end of a container and an outer layer material having the outer edge shape are provided. An inner layer material which is laminated and is sealed in a state where the opening end is closed with respect to a flange provided at the opening end, and a joining strength between the inner layer and the outer layer is increased by the inner layer and the flange. In the easily peelable opening lid set to have a bonding strength smaller than that of the container, an easy-opening portion is formed in the inner layer material, the opening portion partially opening ahead of other portions as the internal pressure of the container increases. It is characterized by having been done.

Therefore, according to the first aspect of the present invention, first, the outer layer material is separated from the inner layer material. Since the bonding strength between the outer layer material and the inner layer material is set as described above, only the outer layer material is easily peeled off without separating the inner layer material and the flange portion.
Note that the bonding strength between the outer layer material and the inner layer material does not correspond to the sealing property as the easily peelable opening lid, and therefore, it is possible to set the bonding strength to the lowest value that can withstand practical use. The peeling of the outer layer material becomes easy.

Here, for example, when heating the contents of the container by a microwave oven, the container is accommodated in the above-described state where only the outer layer material is peeled off. When the internal pressure of the container rises due to the heating, the pressure causes the easy opening to open, and the pressure flows out therethrough. Therefore, damage or forced peeling due to an excessive increase in the internal pressure does not occur, and the contents remain in the container without being scattered. That is, heating in a microwave oven can be performed without using a member such as an overcap. Next, by peeling the inner layer material from the flange portion, the heated content can be taken out of the container.

The invention described in claim 2 is the first invention.
In addition to the above invention, the inner layer material is divided into a plurality of divided bodies, and the easy opening is formed by an abutting portion of each divided body.

Therefore, according to the second aspect of the present invention, by peeling each of the plurality of divided bodies from the flange, the entire area of the opening end is completely exposed and the unsealing is completed.
By dividing the inner layer material into a plurality in this way,
Since the resistance force due to the separation of each divided body is small, even if the adhesive strength between the inner layer material and the flange portion is set high, the entire easily peelable opening lid can be easily peeled. That is, it is possible to achieve both high sealing properties and good opening properties.

[0013] Further, the invention described in claim 3 is an invention according to claim 2.
In addition to the above invention, the divided bodies are provided with knobs, respectively.

Therefore, according to the third aspect of the present invention, since the gripping portions in each divided body are clarified, the operation for peeling each divided body becomes easy, and accordingly, the easy-peeling open lid as a whole. Opening becomes easier.

Further, the invention according to claim 4 is characterized in that the knob is superposed on the surface of the other divided body on the side of the outer layer material.

Therefore, according to the fourth aspect of the present invention, since each knob is exposed above each divided body in a state where the outer layer material is peeled, the operation for peeling each divided body is facilitated. This makes it easier to open the entire easily peelable openable lid.

The invention described in claim 5 provides the invention according to claim 4.
In addition to the above-described invention, the knob is non-adhered to the other divided body or is adhered to the inner layer material and the flange portion with a weaker adhesive strength. .

According to the fifth aspect of the present invention, since each knob has a substantially free end, it is easy to hold the knob, and at this time, the inner layer material and the flange are separated from each other. There is no danger.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment 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 opening lid 1 is sealed to the flange portion 3 by heat sealing in a state where the opening of the molding container 2 is closed. Therefore, the upper surface of the flange 3 is
The seal area 4 is provided.

As shown in FIG. 2, the molding container 2 has a bottom wall portion 5 having a circular flat plate shape, a side wall portion 6 rising from the periphery of the bottom wall portion 5 in a state of being inclined outward, and a side wall portion 6. And a flange portion 3 connected in parallel with the bottom wall portion 5 from the peripheral portion toward the outer peripheral side, and is made of polyethylene or polypropylene. That is, the flange portion 3 forms an annular flat plate. The inside of the molded container 2 contains contents (not shown) such as food or beverage.

On the other hand, the easily peelable opening lid 1 extends slightly outward from the outer peripheral edge of the flange portion 3 as a whole,
Further, the sheet material has a shape and a size substantially following the shape of the flange portion 3. In addition, a portion of the outer peripheral edge of the easily peelable opening lid 1 is provided with a tab 7 for picking which has a larger amount of outward projection than other portions. The tab 7 has a shape such that two tangents touching the outer peripheral edge of the flange portion 3 intersect.

The easily peelable openable lid 1 includes an inner layer material 8 in contact with the flange portion 3 and an outer layer material 9 disposed outside the inner layer material 8. As an example, the inner layer material 8 and the outer layer material 9 are laminated over the entire area excluding the tip of the tab 7. In other words, only the tip portion of the tab 7 of the easily peelable opening lid 1 is a non-adhesive region.

First, the outer layer material 9 will be described in detail.
The outer layer material 9 has a three-layer structure in which a surface layer 10, an intermediate layer 11, and a back layer 12 are laminated in this order from the outside (the side opposite to the surface in contact with the inner layer material 8). Surface layer 10 which is a surface base material
Is made of, for example, a polyester film, a polypropylene film, a polyethylene film, or the like, whose thickness is set to 12 μm to 45 μm.

On the other hand, the intermediate layer 11 which is a barrier material
Is an aluminum foil having 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.

On the other hand, the inner layer material 8 is a laminated film obtained by laminating 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 3.
It has a split structure. That is, as shown in FIG. 3, the whole has a larger circular shape than the flange portion 3 and is divided at the center thereof, and one of the divided pieces 15 is provided with a projecting portion having a shape corresponding to the tab 7.

More specifically, the individual divided bodies 15 and 16
Cuts the inner layer material 8 sealed in the flange portion 3 linearly from a part of the outer peripheral edge to the vicinity of a part of the opposing outer peripheral edge so as to pass over the center point of the bottom wall portion 5, From there, the structure is such that it is further cut substantially parallel to the outer peripheral edge, and then cut at a substantially right angle toward the outer peripheral edge. Therefore, the divided bodies 15 and 16 face each other in a state where the linear cut end faces 19 and 20 extending from a part of the outer peripheral edge to a part of the opposing outer peripheral edge are in contact with each other. Note that the pair of cut end faces 19 and 20 correspond to the easy opening of the present invention.

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, respectively, near one outer peripheral edge. The upper 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 FIG. The lower edge portion is provided with a knob 18 protruding rightward in FIG.

Each of the knobs 17 and 18 is disposed above the flange 3 so as to partially overlap the seal area 4. As shown in FIG. 4, the knobs 17, 18 are superimposed on the other divided bodies 16, 15 in surface contact with each other. Each knob 17, 18 and divided bodies 16, 15
And are not glued. On the other hand, each knob 17,
The upper surface of 18 is adhered to the back layer 12 of the outer layer material 9. The knobs 17 and 18 need only have a structure that can be easily picked. Therefore, for example, a predetermined width at the edge of each knob 17 and 18 is set to the divided body 1.
7 and 18, the inner part is divided into
It is good also as a structure made to adhere to 7 and 18 with weak adhesive strength.

As the surface layer 13 of the inner layer material 8, for example, a polyester film having a thickness of 12 μm to 20 μm is adopted. On the other hand, the back layer 14 of 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 a material corresponding to the material of the target molding container 2 is adopted from these. I have. Any material is a material that does not thermally bond 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 thermally bond to each other.

The tear force of the inner layer material 8 is set to be greater than the tear force of the outer layer material 9. In addition, the inner layer material 8 may be located anywhere on the inner and outer circumferences of the seal area 4 in the inner layer material 8.
No slit for inducing or accelerating the breakage is formed. Further, the bonding 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 smaller than the adhesive strength between the inner layer material 8 and the molded container 2. That is, the structure is such that only the outer layer material 9 can be reliably separated from the inner layer material 8 without separating the inner layer material 8 from the flange portion 3.

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 molding container 2 is examined, when pressure acts on the easily peelable opening lid 1 from the inside of the molding container 2, the easily peeling opening lid 1 is peeled as shown in FIG. Is applied, the sealing area 4 has a large width, and sufficient adhesive strength by heat sealing (JIS standard Z0238: 2.3).
(kg / 15 mm width or more), no peeling occurs. Thereby, sufficient sealing performance can be secured.

Here, when opening the molded container 2 completely sealed with the easily peelable opening lid 1, first, the tab 7
To remove the outer layer material 9 from the inner layer material 8. As described above, the lamination strength between the inner layer material 8 and the outer layer material 9 does not correspond to the adhesive strength to the molded container 2 as the easily peelable opening lid 1, that is, the sealing ability. And the lamination strength can be set to the lowest value that can withstand practical use, so that the peeling of the outer layer material 9 can be performed smoothly.

Next, the molding container 2 is placed in, for example, a microwave oven in a state where only the outer layer material 9 is peeled off, and the contents are heated. The internal pressure of the molding container 2 that rises with heating flows out of the gaps between the cut end surfaces 19 and 20 of the divided bodies 15 and 16 while widening the interval between the cut end surfaces 19 and 20. Forced opening or partial breakage of the easily peelable opening lid 1 due to the increase in height does not occur, and the accompanying scattering of contents is prevented.
Further, the pair of divided bodies 15 and 16 are
The fact that the opening portion made of is substantially closed also prevents the contents from scattering to the outside of the molding container 2. Therefore, another member such as an overcap is not required.

After the heating is completed, the molded container 2 is taken out of the microwave oven and, for example, the knob 17 is gripped and moved in a direction along the seal area 4 to form a divided part integrally formed therewith. The body 15 is peeled off from the flange portion 3 as it advances. With this, the opening progresses, and the divided body 15 is peeled off until it is removed from the flange portion 3, so that the right half of the molded container 2 is opened as shown in FIG. Then, the other knob 18 is gripped and moved in the same manner as described above to peel off the corresponding divided body 16. As a result, the molded container 2 is completely opened. Since the knobs 17 and 18 are not bonded to the lower divided bodies 15 and 16 but are so-called free ends, they can be easily gripped.

As described above, the knobs 17 and 18 form 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 area 4. From
The resistance to peeling is small, so that a large pulling force is not required, and as a result, the package can be opened easily and smoothly. In addition, there is no fear that a part of the inner layer material 8 is broken and remains in the flange portion 3 or the seal area 4 is roughened, so that the opening portion has a good appearance.

As described above, according to the easily peelable opening lid 1 having the above-described structure, only the outer layer material 9 is peeled, so that the internal pressure is released while substantially covering the entire opening portion of the molding container 2. In addition, since the inner layer material 8 and the outer layer material 9 can be easily separated from each other, heating can be performed in a microwave oven without using an overcap or the like. Performance can be improved.

Further, in the above-mentioned easily peelable opening lid 1, since the separation of each of the divided bodies 15 and 16 from the flange portion 3 proceeds in only one direction in the seal region 4, the inner layer material 8 and the inner layer material 8 are separated. Even if the adhesive strength with the flange portion 3 is set high, the inner layer material 8 can be easily and smoothly peeled off, and thereby both high sealing properties and excellent opening properties can be obtained. Further, in the above-mentioned easily peelable opening lid 1, since each member can be constituted by a material generally used conventionally, there is an advantage that the cost does not increase.

In the above-mentioned specific example, a pair of cut end faces is exemplified as the easy opening. However, the present invention is not limited to the above example. May be a spiral cut not connected, 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 illustrated.However, the present invention is not limited to this.For example, the inner area of the seal area is not laminated, and the seal area is not laminated. It may be a structure in which only the area along the area is laminated.

[0039]

As described above, according to the first aspect of the present invention, the outer layer material is large enough to close the open end of the container.
An inner layer material laminated to the flange portion and sealed so as to close the opening end with respect to the flange portion, wherein a bonding strength between the inner layer material and the outer layer material is set to be smaller than an adhesive strength between the inner layer material and the flange portion. An easy-to-peel openable lid, in which an inner layer material is formed with an easy-opening portion that opens partially ahead of other portions with an increase in the internal pressure of the container, allowing the internal pressure of the container to flow out. Since it is a structure in which substantially the entire opening end is closed in the obtained state, heating in a microwave oven can be performed without using a covering member such as an overcap, that is, adaptability to a microwave oven can be achieved. Improvement can be achieved.

According to the second aspect of the present invention, since the inner layer material is constituted by a plurality of divided bodies, and the substantial resistance force due to the peeling of the entire inner layer material is reduced, the inner layer material and the flange portion are separated. Can be easily opened even if the adhesive strength is set to be high, so that an easy-peelable openable lid having both easy-peelability and complete sealing can be obtained.

Further, according to the third to fifth aspects of the present invention, since the knobs for facilitating the separation of the divided bodies are provided, the opening as a whole can be more easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state in which an easily peelable opening lid attached to a molding container is partially cut away.

FIG. 2 is a sectional view showing an easily peelable opening lid and a molded container.

FIG. 3 is a schematic diagram showing an arrangement relationship in a pair of divided bodies.

FIG. 4 is a schematic diagram showing an arrangement 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 opening lid.

FIG. 6 is a schematic diagram showing a state where one of the divided bodies has been removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Easily peelable opening lid, 2 ... Molded container, 3 ... Flange part, 4 ... Seal area, 8 ... Inner layer material, 9 ... Outer layer material, 1
5, 16 ... divided body, 17, 18 ... knob, 19, 20
… Cut end face.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiyasu Usuki 5-5-1 Nishihashimoto, Sagamihara City, Kanagawa Prefecture Within Daiwa Seikan Co., Ltd. (72) Inventor Junji Matsumura 5-5 Nishihashimoto, Sagamihara City, Kanagawa Prefecture No. 1 Daiwa Seikan Co., Ltd. Research Laboratory F term (reference) 3E067 AA11 AB01 BA07A BB15A BB16A BC07A CA24 EA06 EA13 EA29 EA35 EB11 EB27 FC01 GD08

Claims (5)

[Claims] 1. An outer layer material having an outer edge contour capable of closing an open end of a container, and a seal laminated to the outer layer material and sealed to the flange provided at the open end so that the open end is closed. The inner layer material, the bonding strength between the inner layer material and the outer layer material is set to be smaller than the adhesive strength between the inner layer material and the flange portion. An easy-to-peel openable lid, wherein an easy-opening portion is formed which partially opens ahead of other portions with an increase in pressure. 2. The easy peeling method according to claim 1, wherein the inner layer material is divided into a plurality of divided bodies, and the easy opening is formed by an abutting portion between the divided bodies. Opening lid. 3. The easily peelable opening lid according to claim 2, wherein a knob is provided on each of the divided bodies. 4. The easily peelable openable lid according to claim 3, wherein the knob is superposed on the surface of the other divided body on the side of the outer layer material. 5. The method according to claim 4, wherein the knob is non-adhered to the other divided body or is adhered to the inner layer material and the flange with a weaker adhesive strength.
3. The easily peelable openable lid according to 1.).