JPH1129157A - Lid material with spout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent blocking from occurring between overlaid laminates even if an obtained laminate is rolled in a coil by providing an absence of the same size as or larger than a spout on an easy-to-peel adhesive layer for laminating an outer layer material and an inner layer material having the spout. SOLUTION: The lid material 1 comprises an inner layer material 2 and an outer layer material 3 which are laminated via an easy-to-peel adhesive layer 4. A spout 24 is provided through the inner layer material 2. An absence 44 is provided on the easy-to-peel adhesive layer 4 corresponding to the spout 24. The absence 44 is of the same size as or larger than the spout 24, while the adhesive layer 4 may not be exposed when viewed from the spout 24 side. With the absence 44 provided, an internal face of the outer layer material 3 appears from the spout 24. Therefore, when the long lid material 1 is rolled like a coil, even if the outer layer material 3 on a side of the overlaid lid material 1 is fitted in from the spout 24, blocking may not occur since the easy-to- peel adhesive layer 4 is absent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover having an opening such as a decoration discharge port for extruding contents.

[0002]

2. Description of the Related Art Mayonnaise, for example, is commercially available in glass bottles or in flexible extrusion containers. In many cases, a star-shaped decoration discharge port is provided at the opening of this container.

For example, Japanese Patent Publication No. Sho 50-12358 discloses that a synthetic resin member having a discharge port fixed to an opening of an extrusion container and a cushion member are overlapped and inserted between the opening and a screw cap for closing the opening. A technique is disclosed in which only a synthetic resin member with a discharge port is sealed in an opening by high-frequency induction heating to form a discharge port.

However, punching out the two members, that is, the member with the discharge port and the cushion member, and incorporating the member between the cap and the opening of the container complicates the process and causes an increase in cost. In addition, since it is necessary to easily separate the two members from each other and to firmly seal only the member with the discharge port to the container opening, it is difficult to control the working conditions.

[0005]

Therefore, as shown in FIG. 13, it is conceivable to previously laminate two members so that they can be easily peeled off. In the drawing, reference numeral 51 denotes an outer layer material, 52 denotes an easily peelable layer, and 53 denotes an inner layer material having a discharge port 54. Since the inner layer material 53 is sealed in the container opening, a heat sealing layer is formed on the outer surface (lower surface) thereof. have.

[0006] The above-described laminate 50 is usually manufactured as a long product and wound and handled in a coil shape. The film constituting each layer of the laminate 50 is 1
Since the thickness of the stacked body 50 is very small, from about 0 μ to several tens of μm, and the entire stacked body 50 is extremely thin, as shown in FIG.
As can be understood from FIG. 13, the easily peelable layer 5
2 will be crimped. Since the adhesive layer having adhesiveness is generally used in the manufacturing process for the easily peelable layer 52, so-called blocking occurs between the adjacent laminates 50, which hinders rewinding of the coil-like material, A part of the outer surface (for example, paper) of the laminate 50 may be peeled off and handled while being attached to the inner surface of the other laminate 50.
Of course, this causes many inconveniences in the manufacturing process, and defects appear in the product.

Accordingly, a first object of the present invention is to prevent the occurrence of blocking in a laminate used for the above applications.

Further, when the laminate is sandwiched and pressed between the container opening and the cap and heat-sealed to the opening by high-frequency induction heating, the inner surface of the cap slightly melts and the cap and the upper surface of the laminate adhere. As a result, a strong force is required when opening the cap, and sometimes the laminate is broken.

Accordingly, a second object of the present invention is to prevent such a laminated body from being adhered to the cap when the laminated body is pressed against the opening by a cap and sealed by an induction heating method.

[0010]

In order to solve the above first problem, the present invention relates to a lid material in which an inner layer material having an ejection port and an outer layer material are laminated by an easily peelable adhesive layer, wherein It is characterized in that a cutout portion which is equal to or larger than the discharge port is provided. The adhesive force near the periphery of the missing portion can be made relatively strong.

Further, in a lid member in which an inner layer material having a discharge port and an outer layer material are laminated by an easily peelable adhesive layer, the releasability of the outer surface of the outer layer material may be improved.

In order to solve the second problem, the outer surface of the outer layer material is preferably formed by cellophane.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the lid 1 is formed by laminating an inner layer 2 and an outer layer 3 with an easily peelable adhesive layer 4. As shown in FIG. 2, the inner layer material 2 is obtained by laminating a base material 21 and a heat sealing layer 22 with an adhesive layer 23.
The heat sealing layer 22 may be directly provided on the base material 21 by coating or extrusion. If the base material 21 has a heat-sealing property, the heat sealing layer 22 can be omitted. The substrate 21 is preferably made of polypropylene, polyethylene, nylon, polyester, or the like, and may be any of a single substance or a composite thereof. The heat sealing layer 22 may be any as long as it can firmly adhere to the container opening.

As shown in FIGS. 2 and 3, the inner layer material 2 is provided with a discharge port 24 therethrough. Discharge port 2
The shape of 4 is not limited to the star shape as shown in the figure, and can be arbitrarily selected such as a circle or a polygon. The size is also arbitrary. The discharge port 24 can be used for other purposes, for example, as a straw insertion port or an internal pressure release hole.

The easily peelable adhesive layer 4 has an adhesive force adjusted to such an extent that the outer layer material 3 can be easily peeled off from the inner layer material 2 by hand. As shown in FIG. And an adhesive layer 42. The resin layer 41 is made of a single substance or a mixture of, for example, a vinyl resin, a urethane resin, an acrylic resin, a polyamide resin, or a silicone resin having a relatively low adhesive strength, and is formed by a part coat of the resin. FIG. 4 shows an example of the pattern.
As shown in (a), (b) and (c), the uncoated portion (the portion where the adhesive layer 42 is exposed) forms a pattern such as a dot, a line, or a lattice. The adhesive layer 42 may be any resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, etc., as long as the resin can bond the outer layer material 3 and the inner layer material 2. In the case of performing the retort sterilization treatment, it is preferable to use an adhesive having a small decrease in adhesive strength, for example, an adhesive for a two-component curable urethane dry lamination capable of producing a reaction product of a polyol component and an isocyanate component. When weak adhesive strength is sufficient, a resin having easy peeling properties may be used. Further, by using the adhesive layer 42 having a low adhesive force as the easily peelable adhesive layer 4, a one-layer structure in which the resin layer 41 is omitted can be obtained.

As shown in FIGS. 1 and 3, the easily peelable adhesive layer 4 has a cutout portion 44 corresponding to the discharge port 24. The part without this layer 4, that is, the missing part 44
Is equal to or larger than the discharge port 24 so that the layer 4 is not exposed when viewed from the discharge port 24 side. Of course, the shape of the missing portion 44 may be the same as or different from that of the discharge port 24.

By providing the missing portion 44 as described above, FIG.
As is clear from FIG. 7, the inner surface of the outer layer material 3 appears from the discharge port 24. Therefore, when the long lid material 1 is wound in a coil shape, one of the outer layer materials 3 of the overlapping lid material 1 is discharged from the discharge port 24.
Even if the adhesive layer 4
Is missing, so there is no blocking.

The lid 1 as described above is attached to the opening 1 of the container 10.
1, when the internal pressure rises for some reason, as shown in FIG.
In some cases, the outer layer material 3 tends to swell outward due to the internal pressure, and may be separated from the inner interfaces A of the easily peelable adhesive layer 4. Therefore, it is required to increase the internal pressure resistance. In that case, the adhesive strength near the inner interfaces A and A may be increased to increase the peel strength. As a solution, as shown in FIG. 6, it is preferable to reduce the application density of the resin layer 41, that is, increase the density at which the adhesive layer 42 appears, in a range including the periphery of the notch 44. Further, the resin layer 41 is formed in a range including the vicinity of the periphery of the missing portion 44.
May not be provided. As a result, as shown in FIG.
a can be formed.

In addition to the above, the strength of the internal pressure resistance is determined by
It also depends on the relative size of 4 and discharge port 24. FIG. 7A shows a case where the size of the discharge port 24 and the missing portion 44 are equal, and FIGS. 7B and 7C show a case where the missing portion 44 becomes gradually larger than the discharge port 24. That is, X ₁ <X ₂ . In this case, it is considered that the angle θ at which the outer layer material 3 is lifted by the increase in the internal pressure is larger in X ₂ than in X ₁ , that is, θ increases as the missing portion 44 becomes larger than the discharge port 24. When θ increases, the peeling force acting on the easily peelable adhesive layer 4 increases, as understood from the drawing.
Therefore, in order to increase the internal pressure resistance, it can be seen that it is better to make the discharge port 24 and the notch 44 substantially the same size.

In order to prevent blocking, it is preferable to remove the easily peelable adhesive layer 4 as described above. However, as shown in FIG. A similar purpose can be achieved by using a material or by providing a release layer 30 on the outer surface. The release layer 30 may be formed by applying, for example, an acrylic resin or a silicone resin.

The outer layer material 3 is made of a material having a gas barrier property, for example, a metal foil such as an aluminum foil, a metal vapor-deposited film, an inorganic vapor-deposited film such as silicon oxide, a vinylidene chloride copolymer film, ethylene-vinyl alcohol. Copolymer films and the like are preferred. Of course, depending on the application, a material having no gas barrier property can be used. One example of the outer layer material 3 is shown in FIG. In the figure, reference numeral 3
Reference numeral 1 denotes a gas barrier layer.
2. The inner protective layer 33 is laminated via the adhesive layers 34 and 35. Note that the protective layers 32 and 33 can be directly provided by means such as extrusion or coating without using an adhesive.

The inner protective layer 33 is useful when the gas barrier layer 31 is corroded by contents, but may be omitted in some cases. For example, it is preferable to laminate a polyester film on a material which is easily corroded, such as an aluminum foil.

The outer protective layer 32 is similarly formed on the gas barrier layer 31.
When the lid 1 is sealed to the container opening by high-frequency induction heating, the lid 1
In order to prevent false adhesion between the cap and the cap, a highly heat-insulating material such as paper or foamed polyethylene, a material with good release properties such as a polyester film or polypropylene film coated with silicone resin or acrylic resin, A material with a large surface roughness, such as a matte polyester film with irregularities, or a material with high heat resistance and little thermal adhesion, such as cellophane, may be selected. It is a suitable material because it is easy to handle (between the cap and the container opening) and the cost is low. When a film having good releasability such as a polyester film, a polypropylene film, or a mat film coated with a silicone resin or an acrylic resin is used as the outer protective layer 32, FIG.
As described above, the missing portion 44 of the easily peelable adhesive layer 4 (see FIG. 1)
) Is not necessarily provided, but may be provided.

The lid 1 as described above is provided as a long object. When sealing the container opening, as shown in FIG. 10, a sealing material punched out so as to correspond to the shape of the opening. Used as 1a. This sealing material 1a has a tab 5
A cut (half cut) 6 penetrating the inner layer material 2 is provided on the back surface of the base of the tab 5.

When the sealing material 1a is sealed in the opening 11 of the mayonnaise container 10 as shown in FIG. 11 by, for example, a heat sealing hot plate, the sealing material 1a is placed on the upper surface of the opening 11 and heated and heated by the hot plate. I just need. Tab 5 to open
As shown in the figure, the notch 6 is opened, so that the tab 5 is pulled as it is to be peeled off at the interface between the easily peelable adhesive layer 4 and the inner layer material 2 and only the inner layer material 2 having the discharge port 24 is opened. It remains in the part 11. In place of the cut 6, the inner layer material 2 corresponding to the tab 5 may be omitted.

In the case of sealing by high-frequency induction heating, as shown in FIG. 12, the cap 12 is opened with the sealing material 1a placed on the opening 11 of the container 10.
And the screw portions 11a and 12a are engaged, and the cap 1
2, the sealing material 1a is pressed against the opening. Then, induction heating is performed from the outer surface of the cap 12 by a high-frequency induction heating device, and the inner layer material 2 is heat-sealed to the opening 11. Of course, in this case, the outer layer material 3 must include metal foil such as aluminum foil or iron foil.

Opening after sealing may be performed in the same manner as in FIG. 11 after removing the cap 12.

Examples will be described below.

[0030]

[Example 1] $ 30 on the outer surface of 30μ thick aluminum foil
OPT cellophane (18-22μ thickness plain cellophane), 12μ polyester film laminated on the inner surface to form an outer layer material, and the inner layer material is coated with acrylic resin on one surface of a 50μ thickness polyester film in a dot-like manner. 3 on the surface
A 0μ low density polyethylene film was formed as a heat sealing layer. This inner layer material was provided with a star-shaped discharge port having a vertex distance of 12 mm. Then, a two-component curable urethane adhesive is coated on the acrylic resin surface at a portion corresponding to the discharge port with a diameter of 16 m.
The coating was performed while providing a circular notch of m, and the polyester surface of the outer layer material was bonded. Therefore, the easily peelable adhesive layer is formed by the acrylic resin and the urethane adhesive.

When the two-part curable urethane adhesive was cured and then rewound after tension was applied to the laminate, and the two-component curable urethane adhesive was unwound, it could be rewound smoothly without any blocking. No deposit was found on the outer surface of the sample.

A sealing material having a circular tab having a diameter of 20 mm and a length of 7 mm from the outer periphery was punched out of the laminate, and a half cut was formed at the base of the tab at the same time to penetrate the inner layer material.

This sealing material was placed on the opening of a polyethylene tube-type container having a bottle mouth with an outer diameter of 18 mm, and a polyethylene screw cap was screwed and crimped to the opening.
Heat sealing was performed using a high frequency induction device. When 50 of the same samples were prepared and the screw caps were loosened by hand, all the caps could be removed normally, and no trace of the seal material adhered to the inner surface of the cap was observed.

Next, when the tab of the sealing material was pinched by hand, raised and pulled, only the outer layer material was smoothly peeled off in all cases, and the inner layer material remained firmly fixed to the opening of the container.

[0035]

[Embodiment 2] When acrylic resin was applied to the inner layer material of Embodiment 1 in a dot-punched shape, the diameter corresponding to the discharge port was 18 mm.
Are provided with a portion having a high spotting density. Otherwise, a laminate was formed in the same manner as in Example 1 and a similar test was performed. As a result, similar results were obtained.

[0036]

Example 3 An acrylic resin was applied to the upper surface of the outer layer material of Example 1, and a laminate similar to that of Example 1 was formed without providing a cutout portion in the easily peelable adhesive layer. Similar results were obtained.

[0037]

Example 4 A laminate having the same structure as in Example 1 was prepared except that a molten polyethylene resin was used as the adhesive layer of the easily peelable adhesive layer in Example 2, and a similar test was performed.
Similar results were obtained.

[0038]

Example 5 A laminate having the same structure as in Example 1 was prepared except that a 12 μ polyester film was used on the outer surface of the outer layer material, and sealed in a container similar to that of Example 1 with a hot plate.
No blocking occurred and there were no other disadvantages.

[0039]

According to the present invention, as described above, an easily peelable adhesive layer for laminating an outer layer material and an inner layer material having a discharge port is provided with:
Since a cutout portion equal to or larger than the discharge port is provided, even when the obtained laminate is wound in a coil shape, it is possible to smoothly rewind without causing blocking between the stacked laminates. . And this blocking prevention effect is exhibited regardless of the material of the outer layer material.

On the other hand, when no missing portion is provided in the easily peelable adhesive layer, the same blocking prevention effect can be obtained by setting the outer surface of the outer layer material to a surface having good releasability.

Further, in the case where the sealing material made of the laminate is sandwiched between the container opening and the cap and heat-sealed by high-frequency induction heating, the releasability of the upper surface of the laminate, that is, the surface in contact with the cap. By keeping the satisfactorily, the cap and the sealing material do not adhere to each other, and do not hinder the cap from being loosened and removed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a lid material of the present invention.

FIG. 2 is a sectional view showing the inner layer material according to the first embodiment;

FIG. 3 is a rear view of the lid member.

FIG. 4 is a plan view showing an application pattern of a release resin.

FIG. 5 is a longitudinal sectional view showing a state in which a lid member according to another embodiment of the present invention is heat-sealed to a container.

FIG. 6 is a plan view showing another example of a resin application pattern having a weak adhesive force.

FIG. 7 is a longitudinal sectional view showing a state in which a peeling force is applied by an internal pressure.

FIG. 8 is a cross-sectional view showing another example of the lid member.

FIG. 9 is a sectional view showing an outer layer material of the lid material.

FIG. 10 is a plan view of a sealing material.

FIG. 11 is a longitudinal sectional view showing a state in which a sealing material is sealed in a container opening.

FIG. 12 is a longitudinal sectional view showing a state in which a sealing material is heat-sealed by high-frequency induction heating.

FIG. 13 is a cross-sectional view showing an example of a laminate for explaining a problem.

FIG. 14 is a partial cross-sectional view showing a state in which the laminate is wound in a coil shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover material 1a Seal material 2 Inner layer material 3 Outer layer material 4 Easy peeling adhesive layer 5 Tab 6 Cut 10 Container 11 Opening 12 Cap 11a, 12a Screw part 21 Base material 22 Heat sealing layer 23 Adhesive layer 24 Discharge port 30 Release Layer 31 Gas barrier layer 32 Outer surface protection layer 33 Inner surface protection layer 34, 35 Adhesive layer 41 Releasable resin layer 42 Adhesive layer 42a Layer having relatively high adhesive strength 44 Missing portion 50 Stack 51 Outer layer material 52 Easy peeling layer 53 Inner layer material 54 Discharge port

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Saburo Yamashita 3-6-8 Kutaro-cho, Chuo-ku, Osaka-shi Toyo Aluminum Co., Ltd. (72) Inventor Mamoru Kamata 3-6-68 Kutaro-cho, Chuo-ku, Osaka-shi No. Toyo Aluminum Co., Ltd. (72) Inventor Takeo Kumada 2-1-1 Shimoge, Takatsu-ku, Kawasaki City Inside Knoll Foods Co., Ltd. (72) Inventor Kazumi Iijima 1-1-1, Suzukicho, Kawasaki-ku, Kawasaki Ajinomoto Inside the Production Technology Laboratory, Inc.

Claims (5)

[Claims] 1. A cover material in which an inner layer material having an ejection port and an outer layer material are laminated by an easily peelable adhesive layer, wherein the easily peelable adhesive layer is provided with a cutout portion which is equal to or larger than the discharge port. Cover material with a discharge port. 2. The lid member with a discharge port according to claim 1, wherein the adhesive force in the vicinity of the peripheral edge of the missing portion is relatively strong. 3. A lid material having a discharge port, wherein the outer layer material has good releasability in a lid material in which an inner layer material having an outlet port and an outer layer material are laminated by an easily peelable adhesive layer. 4. The lid member with a discharge port according to claim 1, wherein the outer layer material has a metal foil. 5. The lid material according to claim 1, wherein an outer surface of the outer layer material is made of cellophane.