JP2007186217A - Lid and package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid material formed by sticking together an external layer and an internal layer via an adhesive layer so that one is peelable from the other, the lid material being designed such that a relatively small partial opening is easily defined in the internal layer at a lower cost without occurrences of residue of removal or contents or the like sticking to the opening. <P>SOLUTION: The internal layer 13 of the lid material 10 is formed from a base material layer 13a and a heat-shrink resin layer 13b. Curved or bent cuts 13c are made through the internal layer 13. The lid material 10 is heated to apply shrinking force to a heat shrinkable resin layer 13b. The lid material 10 is stuck to the flange 23 of the container 20 storing contents 30 and thus a package 1 is produced. By peeling the external layer 11 of the lid material 10 while holding the tab 10a, a flap 13d sectioned by the cut 13c of internal layer 13 curls by the shrinking force of the heat shrinkable resin layer 13b. Consequently, a partial opening 13e is formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lid used for containers of foods, beverages, medicines, fragrances, deodorants and the like, and a package using the lid.

Conventionally, a lid formed by releasably bonding an outer layer and an inner layer through an adhesive layer has been used in containers for foods, beverages, medicines, fragrances, deodorants and the like.
For example, Patent Document 1 describes a lid member in which a cut or perforation is provided in an inner layer and a part of the inner layer surrounded by the cut or perforation is strongly bonded to the outer layer. When the outer layer of the lid member is peeled from the inner layer, a part of the inner layer is attached to the outer layer, so that the cuts and perforations are broken, and a part of the lid member is partially opened.

A package using such a lid material has an advantage that it has a good sealing property when not in use and can easily form an opening in a part thereof when used.
However, in the case of adopting a structure in which a cut or the like is provided in the inner layer and the portion surrounded by the cut or the like is strongly bonded to the outer layer in this way, it is effective when a relatively large partial opening is intended, but the small It is not suitable for the purpose of partial opening.
This is because if the inner layer has small cuts, it is difficult to strongly bond only the part surrounded by the cuts to the outer layer. This is because there is a possibility that parts other than the part surrounded by etc. may break carelessly.

Therefore, instead of this, a lid material in which a small partial opening is formed by providing a small through hole in the inner layer in advance has been devised. This eliminates the need for strong adhesion between the inner layer and the outer layer, thus solving the problems such as inadvertent breakage described above.
However, in this case, it is necessary to process the removed residue so that the removed residue generated when the through-hole is drilled does not adhere to the lid material or mix into the container contents, but this is troublesome and costly. It also takes. In addition, since the adhesive layer in the through-hole portion is exposed, there is a problem that foreign matters and contents adhere.
JP-A 61-287571

  Therefore, the present invention provides a cover material in which the outer layer and the inner layer are detachably bonded via an adhesive layer, and the inner layer is relatively free from the occurrence of scum or the contents adhering to the opening. It is an object to form a small partial opening easily and at low cost.

  In order to solve the above-described problems, in the present invention, in a lid member in which an outer layer and an inner layer are detachably bonded via an adhesive layer, the inner layer includes at least a base material layer and a heat-shrinkable resin layer. The inner layer is provided with one or more notches penetrating the front and back surfaces.

When the lid member configured as described above is heated, a shrinkage force is applied to the heat-shrinkable resin. Therefore, the flap defined by the cut is peeled off from the outer layer and curled, or when the outer layer is peeled from the inner layer, the flap defined by the cut is curled. Thus, a relatively small partial opening is formed by curling the flap.
At that time, since only the cut is formed in the inner layer, there is no occurrence of scum as in the conventional case, and the processing effort and cost can be saved. Further, since there is a curled flap below the opening, the contents and the like are difficult to adhere to the opening.
In addition, unlike the cover material described in Patent Document 1 described above, since it is not necessary to strongly bond the outer layer and the inner layer, it is possible to avoid the trouble of aligning the partial opening of the inner layer and the strong bonding portion, Further, inadvertent breakage of the inner layer due to the displacement of these positions can be prevented.
In addition, it is more preferable that the flap partitioned by the cut is curled for the first time when the outer layer is peeled off from the inner layer because the sealing property when not in use is high.

Here, the heat shrinkage rate of the heat-shrinkable resin layer is preferably 1 to 50%. This is because when the heat shrinkage rate is less than 1%, the shrinkage force that sufficiently generates the curl is poor, and when it exceeds 50%, the shrinkage force becomes excessively strong and wrinkles or cracks may occur in the lid. Because there is. For the same reason, the heat shrinkage rate is more preferably 1.5 to 30%.
Here, the heat shrinkage rate is calculated by the following equation when a heat shrinkable resin layer formed in a sheet shape is heated in a 120 ° C. atmosphere for 30 minutes.
Thermal shrinkage (%) = {(length of film before heating−length of film after heating) / (length of film before heating)} × 100
For example, the length of the film before heating is 100 mm at room temperature, and after being held in an oven at 120 ° C. for 30 minutes, the film is taken out of the oven, cooled to room temperature, the length of the film is scaled, a comparator, etc. If it is 90 mm, the heat shrinkage rate is 10%. Other details are based on JIS C2318.
The heat shrinkage rate differs in the length (longitudinal direction at the time of film production) and the width (width direction at the time of film production) in the case of an unstretched film as well as a stretched film. If you are satisfied. More preferably, the heat shrinkage rate in the direction in which the flap curls during heating should satisfy the above.

When the heat-shrinkable resin layer is composed of a heat-shrinkable sealant film, the heat-shrinkable resin layer itself has a heat-bonding performance, so that it is not necessary to separately laminate an adhesive layer and is simple.
Further, as another aspect, the heat shrinkable resin layer is composed of a heat shrinkable film and a heat bonding layer coated on one surface thereof, so that the cost is low.

When the notch is formed so as to draw a curved line or a bent line, the flexibility of the flap defined by the notch is improved. Therefore, compared with the case where the cut is formed in a straight line, the curl when thermally contracted becomes larger, and the size of the partial opening can be sufficiently taken.
Here, that the notch draws a curved line or a bent line means that the slopes of tangents at at least two points on the notch are different.
As a curved line or a bent line, any of a U-shaped, U-shaped, V-shaped, U-shaped, H-shaped, X-shaped, circular arc, corrugated shape, or a combination thereof can be easily formed. Since the flap is easily curled, heating is preferable because a sufficient partial opening can be obtained.

  If a package is comprised from such a lid | cover material, the container by which the opening part was sealed with the lid | cover material, and the content accommodated in the container, it is suitable for forming a small partial opening in a package.

  By adopting a configuration in which the heat shrinkable resin layer of the inner layer is heat shrunk by heating and the flaps defined by the notches provided in the inner layer are curled, punching residue is generated or contents etc. are attached to the opening Therefore, a small partial opening can be formed easily and at low cost.

Embodiments of the present invention will be described below with reference to the drawings. The lid | cover material 10 concerning embodiment is shown in FIGS. 1-4, and the package 1 concerning embodiment is shown to FIG. 5 and FIG.
As shown in FIG. 1, the lid member 10 according to the embodiment includes an outer layer 11, an inner layer 13, and an adhesive layer 12 that adheres them in a peelable manner.
As shown in FIGS. 3 and 4, the lid member 10 has a substantially disk shape with a tab 10a, and a sheet formed by laminating an outer layer material, an adhesive layer material, and an inner layer material is punched out with a die. It is formed by. Hereinafter, the outer layer 11, the adhesive layer 12, and the inner layer 13 will be described.

  First, the outer layer 11 is made of a simple substance or a composite such as a synthetic resin film, paper, or metal foil. Examples of the synthetic resin film include, in addition to a known resin film, for example, a matted (white turbid) resin film, a resin film subjected to an antistatic treatment, a resin film on which alumina, silicon oxide, or the like is deposited.

Next, as shown in FIG. 2, the adhesive layer 12 is preferably composed of a weak adhesive layer 12a made of a resin having a relatively weak adhesive force and a strong adhesive layer 12b made of an adhesive having a strong adhesive force.
Examples of the resin having a relatively weak adhesive force (hereinafter referred to as a release coating agent) include an acrylic resin, a polyamide resin, a vinyl resin, and a silicone resin. The coating amount of the release coating agent is not limited, but it is usually desirable that the coating weight be about 0.1 to 3 g / m ² after drying. The weak adhesive layer 12a is formed by applying this release coating agent to the entire surface of one side of the base material layer of the inner layer 13 or by part coating with a predetermined pattern, and the adhesive force of the adhesive layer 12 is adjusted as appropriate.
Examples of the weak adhesive layer 12a are shown in FIGS. 3 (a), 3 (b), and 3 (c). The release coating agent is formed into a lattice dot pattern in FIG. 3A, a parallel line pattern in FIG. 3B, and a lattice layer pattern in FIG. It is applied to.
As shown in FIG. 2, the strong adhesive layer 12b is made of an adhesive having a strong adhesive force so as to cover both the weak adhesive layer 12a on the surface of the inner layer 13 where the release coating agent is applied and the part where the release coating agent is not applied. It is formed by coating.
Examples of the adhesive having strong adhesive strength include an ethylene vinyl acetate copolymer, a polyurethane adhesive, a polyester adhesive, polyethylene, and a vinyl chloride-vinyl acetate copolymer. The application amount of the adhesive is not limited, but generally it may be about 0.5 to 15 g / m ^{2 by} weight after drying.

  Further, instead of the adhesive layer 12 composed of the weak adhesive layer 12a and the strong adhesive layer 12b, an adhesive (adhesive) having a weak adhesive strength to the extent that it can be easily peeled by hand may be used. The adhesive strength of the adhesive layer 12 is not particularly limited as long as it can be easily peeled by hand, but is usually 0.05 (N / 15 mm width) or more and less than 2.0 (N / 15 mm width). Any degree is acceptable.

Next, the inner layer 13 includes a base material layer 13a and a heat-shrinkable resin layer 13b. Similar to the outer layer 11, the base material layer 13a is made of a simple substance such as a synthetic resin film, paper, or metal foil, or a composite. As the synthetic resin film, there are, for example, a matte (white turbidity) resin film, a resin film subjected to an antistatic treatment, a film on which alumina, silicon oxide or the like is deposited, in addition to a known resin film.
The heat-shrinkable resin layer 13b is not particularly limited as long as it has a heat-shrinkable resin. For example, at least one selected from unstretched polypropylene, stretched polypropylene, styrene, polyethylene, polyester, and the like is used. Is preferred.
The heat shrinkage rate of the heat-shrinkable resin layer 13b is preferably 1 to 50% in a film state, and more preferably 1.5 to 30%.
Here, lamination | stacking with the base material layer 13a and the heat-shrinkable resin layer 13b shall be based on well-known means, such as bonding by an adhesive agent, co-extrusion, extrusion coating, heat lamination, wet lamination.

  In the inner layer 13, when the packaging body 1 to be described later is formed, a notch 13 c penetrating the front and back of a curved line or a bent line is formed in an arbitrary portion inside the flange 23 of the container 20. Examples of the shape of the notch 13c are shown in FIGS. 4 (a), U-shaped (arc) as shown in FIG. 4 (b), V-shaped (shaped) as shown in FIG. 4 (c), FIG. 4 (d). Thus, a letter X (+), a wave (S) as shown in FIG. 4 (e), and a letter H (I) as shown in FIG. 4 (f) can be considered. A combination of these may also be used. Moreover, as shown in the drawing, a portion defined by the notch 13c forms a flap 13d.

  Of course, at least one of the outer layer 11 and the inner layer 13 may be printed, and a light shielding layer, an OP (overprint) layer, a primer layer, an anchor coat layer, and the like may be laminated as necessary. Further, an antifogging agent, a lubricant, an anti-slip agent, and various coating agents may be coated on the surface.

As shown in FIGS. 5 and 6, the packaging body 1 according to the embodiment includes the lid member 10, the container 20, and the contents 30 described above.
As shown in the figure, the container 20 includes a circular bottom surface 21, a peripheral surface 22 that rises in a tapered shape from the periphery of the bottom surface 21, and a flange 23 that projects horizontally from the upper edge of the peripheral surface 22. The lid 10 is heat sealed. The material of the container 20 is not particularly limited, but glass containers, paper containers, metal containers, and plastic (polypropylene, polyethylene, polyester, polystyrene, etc.) containers are preferable.
As shown in the figure, the contents 30 are stored in a storage unit surrounded by the bottom surface 21 and the peripheral surface 22 of the container 20. Although the kind of the content 30 is not specifically limited, A foodstuff, a drink, a chemical | medical agent, an aromatic, and a deodorizer are preferable.

The package 1 is completed by heating the flap 13d portion of the lid 10. The heating of the flap 13d portion may be before heat-sealing the lid member 10 to the flange 23 of the container 20, simultaneously with heat sealing, or after heat sealing.
When the flap 13d portion is heated in this manner, the heat-shrinkable resin layer 12b contracts and a contracting force is applied to the inner layer 13. Therefore, as shown in FIG. 5, when the outer layer 11 of the lid member 10 is peeled from the inner layer 13, the flap 13 d defined by the notch 13 c curls, so that a relatively small partial opening 13 e is generated in the inner layer 13. Alternatively, as shown in FIG. 6, the flap 13 d is curled before the outer layer 11 of the lid member 10 is peeled from the inner layer 13, so that a relatively small partial opening 13 e is generated in the inner layer 13.

For example, when the content 30 of the package 1 is a deodorant, when the outer layer 11 of the lid 10 is pinched and peeled off, the deodorant component is released into the atmosphere from the partial opening 13e. It is provided for use. At this time, since the partial opening 13e is small, it is possible to prevent dust in the atmosphere from adhering to the deodorant. The usage when the content 30 is other than a deodorant is substantially the same.
In addition, the partial opening 13e of a desired size can be obtained by appropriately adjusting the length (size) of the cut 13c according to the type of the content 30 and the usage situation.

  Hereinafter, more detailed examples and comparative examples will be given. About these, the measurement test mentioned later was done. Three packaging bodies are produced as examples, and one packaging body is produced as a comparative example. These packages are composed of a lid and a container, and the contents are not stored in the container.

The cover materials of the examples were obtained by sequentially laminating an outer layer material / adhesive / release coat / inner layer substrate / adhesive / heat-shrinkable resin, and the following materials and materials were used.
Outer layer material: Polyethylene terephthalate film (thickness 25 μm)
Adhesive: Two-component curable polyurethane adhesive (1 part by weight of KW75 curing agent manufactured by the same company is added to 10 parts by weight of LX500 polyester main agent manufactured by Dainippon Ink & Chemicals, Inc.)
Release coat: Main component acrylic release coat Inner layer base material: Polyethylene terephthalate film (thickness 12 μm)
Heat-shrinkable resin: Unstretched polypropylene film P1153 (thickness 60 μm) manufactured by Toyobo Co., Ltd. Heat shrinkage: 1.7% vertical, 1.0% horizontal (after holding at 120 ° C. atmosphere for 30 minutes, other JIS C2318 compliant)

The lid material of the example was manufactured as follows. First, a release coating agent is preliminarily printed on one side of the inner layer base material in a grid pattern by a gravure method so that the laminate strength is 0.1 N / 15 mm width, and an adhesive is applied to the entire other surface of the inner layer base material. After dilution with ethyl acetate, after drying and coating by a gravure method so that the coating amount becomes 3.5 g / m ² , a film-like heat-shrinkable resin was bonded, and aging (curing) at 40 ° C. for 3 days was performed.
Next, in the portion corresponding to the substantially central portion of the lid member, in Example 1, a notch of a V-shape (character height 5 mm) having an angle of 90 ° between two lines is used. The V-shaped notch with a line segment angle of 60 ° (character height 5 mm), and in Example 3, the U-shaped notch (character width and height 5 mm) penetrates the front and back of the lid inner layer. In addition, it was applied with a knife, and a portion corresponding to the base of the tab of the inner layer of the lid was cut.
Then, after diluting the adhesive with ethyl acetate on one side of the outer layer material, after applying by gravure method so that the coating amount after drying is 3.5 g / m ² , it is bonded to the release coating surface of the inner layer base material, Aging (curing) was performed at 40 ° C. for 3 days. The outer shape of the lid member was punched out with a mold so as to be a substantially disk shape with a tab of φ80 mm.

Production of the package of the example was performed as follows. The container is a polypropylene container (bottom diameter 55 mm, bottom diameter, rising from a circumferential bottom surface, a peripheral surface with an upper edge forming an opening, and a flange projecting horizontally from the upper edge of the peripheral surface. Using a height of 70 mm, an opening diameter of 70 mm, and a flange width of 4 mm, the flange of the container and the heat-shrinkable resin surface of the lid were heat sealed at 200 ° C. × 80 kg / cup × 1 second.
Thereafter, a hot plate heated to 200 ° C. was applied for 1 second to a substantially central portion where the cover material was cut to give a shrinkage force to the heat-shrinkable resin. As a matter of course, when the substantially central portion was not heated, no curling occurred even after the outer layer material was peeled off.

  In Comparative Example 1, in place of the heat-shrinkable resin, a non-heat-shrinkable general-purpose resin film (commercially available product, heat shrinkage ratio: vertical 0.6%, horizontal 0.7%: after holding at 120 ° C. atmosphere for 30 minutes and others JIS Example 2 is the same as Example 1 except that C2318 is used.

After peeling off the outer layer material of the packaging body of Examples 1 to 3 and Comparative Example 1 produced as described above with fingers, the height of the curl of the flap part partitioned by the cut (other than the flap part of the lid material, The maximum distance between the curled flap portion and the cover member in the vertical direction was measured using a ruler.
The test results are shown in FIG. As shown in the figure, the curl was stably formed in the example, but it was confirmed that the curl was hardly formed in the comparative example. That is, in the embodiment, by adjusting the shape of the notch or the like, a partial opening having a size as required is formed by heat shrinkage, but in the comparative example, since the heat shrinkage does not occur, the required partial opening. Will not be formed.

Sectional drawing of the cover material concerning embodiment Enlarged sectional view of the adhesive layer of the lid Plan view showing application pattern of weak adhesive layer Plan view showing the pattern of notches in the inner layer Sectional drawing of the package concerning one embodiment Sectional drawing of the package concerning other embodiment Table showing test results

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Package 10 Cover material 10a Tab 11 Outer layer 12 Adhesive layer 12a Weak adhesive layer 12b Strong adhesive layer 13 Inner layer 13a Base material layer 13b Heat shrinkable resin layer 13c Notch 13d Flap 13e Partial opening 20 Container 21 Bottom surface 22 Peripheral surface 23 Flange 30 Contents

Claims (10)

  In a lid formed by releasably bonding an outer layer and an inner layer through an adhesive layer, the inner layer includes at least a base material layer and a heat-shrinkable resin layer, and one or more penetrating the front and back surfaces of the inner layer A lid material provided with a notch.   The lid member according to claim 1, wherein the heat shrinkable resin layer has a heat shrinkage rate of 1 to 50%.   The lid according to claim 1 or 2, wherein the heat-shrinkable resin layer is made of a heat-shrinkable sealant film.   The lid material according to claim 1 or 2, wherein the heat-shrinkable resin layer comprises a heat-shrinkable film and a heat-adhesive layer coated on one surface thereof.   The lid according to any one of claims 1 to 4, wherein the notch draws a curved line or a bent line.   The shape of the curved line or the bent line is any one of a square shape, a U shape, a V shape, a U shape, an H shape, an X shape, an arc shape, a corrugated shape, or a combination thereof. The lid material described.   A lid material obtained by applying a shrinkage force by heating to the heat-shrinkable resin layer of the inner layer of the lid material according to claim 1.   The lid material according to claim 7, wherein the flap defined by the cut of the inner layer is peeled off from the outer layer and curled by applying a shrinkage force to the heat-shrinkable resin layer.   The lid material according to claim 7, wherein when the outer layer is peeled from the inner layer by applying a shrinkage force to the heat-shrinkable resin layer, the flap defined by the cut of the inner layer curls.   A package comprising the lid according to any one of claims 1 to 9, a container having an opening sealed with the lid, and contents stored in the container.

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