JPS587549B2 - sealed container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed container, and is particularly suitable as a package that can be filled with powder, granular materials, fluid food and drink, etc., and can be sealed and easily provided with an opening for taking out the filled material during use. It is something.

BACKGROUND ART Conventionally, a sealed package in which a lid material coated with a heat-sensitive adhesive is adhered to the opening of a container body filled with contents by heat sealing has been used as an individual package for food and drink.

To take out the contents of this package, just pinch and pull the edge of the lid material on the opening edge of the container body.The adhesive strength of the lid material to the container body is weak, so it can be easily peeled off to form an opening. Although there are advantages, there are disadvantages in that the seal portion may peel off due to impact during handling or transportation of the package, causing the contents to flow out, and it is not possible to form an opening in a predetermined shape.

In addition, there are also containers in which the lid material is tightly sealed to the container body and an opening is provided in the lid material.

In this case, the lid material is an aluminum layer on the outside and a polyethylene layer on the inside. A notch is provided at the position where the opening is formed in the aluminum layer, and a peel-off tab made of aluminum sheet can be pinched at one end on top of the notch. By pulling the peel-off tab, the lid material can be cut from the notched portion to form a hole in the lid.

However, this lid material requires the use of an aluminum layer, and since a cut in the aluminum layer is formed in the hole, there is a risk of cutting the lips when drinking a beverage directly.

In addition, when a printed pattern is applied to provide a peel-off tab, there are disadvantages such as poor appearance and complicated manufacturing and high cost. To provide an inexpensive sealed container in which an opening can be formed by easily peeling off a part of the lid material, and the container body and the lid material can be strongly sealed, by eliminating the drawbacks of the sealed container. The gist is that the lid material has a synthetic resin layer that can be heat-sealed to the brim of the opening of the container body on one side of the lid base material, which is made of a film oriented in one direction and easily torn. A cut is made in the lid material over a predetermined width in a direction intersecting the orientation direction of the lid base material, and the lid material is pulled in the orientation direction of the lid base material from this cut. Half of the tear piece is inserted and adhered to the synthetic resin layer on the inner surface of the lid, the cut and the inserted and glued tear piece are covered with a backing material, and this backing material is attached to the synthetic resin layer on the inner surface of the lid around the tear piece. The present invention resides in a sealed container characterized in that the layer is glued to the container.

Next, the sealed container of the present invention will be explained with reference to the drawings.

FIGS. 1 and 2 are a sectional view and a plan view showing an example of a sealed container of the present invention, in which 1 is a container body and 2 is a lid material.

The container body 1 is a cup-shaped container, and the outer layer 11 is made of paperboard, and a heat-fusible film such as polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, polypropylene, or a laminated film thereof is vacuum-formed on the inner surface. A water-resistant inner layer 12 is adhered thereto.

The opening edge of this container body 1 is bent outward to form a flange 13.

Further, the lid material 2 has a synthetic resin layer 22 that can be heat-sealed to the flange 3 of the container body 1 on one surface of a lid base material 21 made of a film oriented in one direction so as to be easily torn. be.

The lid base material 21 is a film made of polyethylene, polypropylene, polyethylene terephrate, polyamide, etc., oriented in one direction by rolling or uniaxial stretching, and the synthetic resin layer 22 is the inner layer of the container body 1. Any material can be used as long as it can be thermally fused to the inner layer 12, and preferably the same type of resin layer as the inner layer 12.

The lid material 2 is made of, for example, a laminated film of a high-density polyethylene film, which is the lid base material 21, and a low-density polyethylene film, which is a synthetic resin layer.
It can be easily produced by rolling a synthetic resin layer to about 5 to 1/6, extrusion laminating or dry laminating a synthetic resin layer on the lid base material 21 obtained by a rolling method or uniaxial stretching method, or solution coating.

A surface material layer 23 may be provided on the outer surface of the lid base material 21.

The purpose of the surface material layer 23 is to impart printability to the lid base material 21;
It is provided for the purpose of maintaining strength in the direction perpendicular to the orientation direction of the lid base material 21 and for providing gas barrier properties. For example, aluminum foil, cellophane, paper, plastic film, etc. can be used, and the lid base material 21 is bonded. has been done.

The lid material 2 is placed over the flange 13 of the opening of the container body 1 so that the synthetic resin layer 22 is in contact with the flange 13, and is heat-sealed to the flange 13 for sealing.

The container body 1 is filled with contents A.

A cut 24 is made in the lid material 2 in a direction intersecting the orientation direction of the lid base material 21.

As long as the cuts 24 are provided over a predetermined width in the direction intersecting the alignment direction, they may be perpendicular to the alignment direction, oblique to the alignment direction, or may be provided in a zigzag pattern.

Then, as shown in an enlarged view in FIG. 3, a half part 31 of the tear piece 3 is inserted into this cut 24 in the orientation direction of the lid base material 21, and a half part 31 of the tear piece 3 inserted through the cut 24 31 is bonded to the synthetic resin layer 22 on the inner surface of the lid 2, and the other half 32 of the tear piece 3 protrudes from the lid 2 to the outside.

In addition, the cut 24 and the tear piece half 31 are covered with a backing material 4,
This backing material 4 is adhered to the synthetic resin layer 22 on the inner surface of the lid material 2 around the tear piece half 31.

In addition, 33 and 34 indicate the bonded portion between the tear piece 3 and the synthetic resin layer 22, 41 indicates the bonded portion between the backing material 4 and the synthetic resin layer 22, and 42 indicates the bonded portion between the backing material 4 and the tear piece 3. There is.

To take out the contents A from the sealed container formed as described above, remove the half portion 3 of the tear piece 3 protruding from the lid 2 to the outside.
2, pick it up, and pull it along the orientation direction of the lid base material 21 as shown in FIG.

The lid material 2 is torn in the orientation direction of the lid base material 21 from both ends of the cut 24, and is peeled off from the backing material 4 to form the cut 2 in the lid material 2.
An opening 5 having a width of 4 is formed.

In order to form the opening 5 in this manner, the half portion 31 of the tear piece 3 must be strongly adhered to the synthetic resin layer 22, and the backing material 4 and the synthetic resin layer 22 must be adhered to such an extent that they can be peeled off. good.

For example, the tear piece 3 is formed from a synthetic resin sheet piece of the same type as the synthetic resin layer 22 and heat-sealed with a sealing strength of 1.0 kg/1.5 mm or more, while the backing material 4 is made of a synthetic resin sheet piece of the same type as the synthetic resin layer 22. Use a film that does not have very good fusion properties, or use a laminated film that causes delamination, such as a stretched film of polyethylene or polyamide, or a thin piece of aluminum, with a hot-melt adhesive layer provided on the adhesive layer side. material 2
Heat fusion is performed toward the synthetic resin layer 22 on the inner surface to give a thickness of 0.3 to 1.
The adhesive strength may be 0 kg/1.5 mm width.

In addition, the lid base material 21 has a tensile strength of 2,000 kg/cu2 or more and a thickness of 0.02 mm or more, preferably 0.04 to 0.0
5 mm, and the synthetic resin layer 22 has a thickness of 0.02 to 0.5 mm.
It is about 0.03 mm.

In order to make the lid material 2, a laminated film consisting of a lid base material 21, a synthetic resin layer 22 and, if necessary, a surface material layer 23 is made, and at the same time the laminated film is punched into a predetermined shape, cuts 24 are provided. .

Then, the half part 31 of the tear piece 3 is inserted into this cut 24 and overlapped with the film surface, and the backing material 4 is further covered on top of this,
These may be heat-sealed by heating and pressing.

In this case, the resin forming the tear piece 3 and the backing material 4 is selected so that the contact portion 33 between the synthetic resin layer 22 of the lid material 2 and the half part 31 of the tear piece 3 is formed between the synthetic resin layer 22 and the backing material 4. Adhesive part 4
It is preferable that the adhesive force be made stronger than that at the adhesive part 42 between the half part 31 of the tear piece 1 and the tear piece 3 and the backing material 4.

Note that the outer surface of the lid 2 is made of a layer that is difficult to thermally fuse with the tear piece 3 so that the half portion 32 of the tear piece 3 that protrudes outside from the lid 2 does not adhere to the outer surface of the lid 2 during heat suppression. It is better.

Further, the tear piece 3 is inserted into the cut and overlapped with the lid material 2. is,
As it is pressed under pressure, it is deformed between the cuts and at the same time adheres to the synthetic resin layer 22 of the lid material 2 on both sides of the cuts, the cuts are closed, and the backing material 4 is bonded around the tear piece 3. Together with this, the sealing performance at the cut is maintained.

If a material having a rigid layer such as a stretched film made of polypropylene or polyamide is used as the lining material 4, the internal pressure of the container applied to the lining material 4 will be dispersed and the adhesive strength of the adhesive portion 41 will be increased. Even if it is weak, it does not peel off and has tear pieces 3
When the opening 5 is formed by pulling the material, it is likely to be peeled off.

Moreover, the cut 24 is formed in the lid base material 21 as shown in FIGS. 5 and 6.
If the tear piece 3 is provided obliquely to the orientation direction (in the direction of the arrow), it will easily separate from the backing material 4 when the tear piece 3 is pulled to form the opening 5.

Furthermore, if notches 25, 25 are provided at both ends of the cut 24 in the orientation direction of the lid base material 21, this will trigger the lid material 2 to tear, making it easier to tear.

Further, in the present invention, the container body 1 may be made by vacuum forming a heat-fusible synthetic resin sheet as long as it has an inner surface that can be bonded to the synthetic resin layer 22 of the lid material 2. , an outer layer 11 made of paperboard and an inner layer 1 made of heat-fusible material shown in the examples.
If the container is made of 2, it can be disposed of by incineration, so it is preferable as a sealed container for disposable packaging.

The hermetically sealed container of the present invention is constructed as described above, and has a lid base made of a unidirectionally oriented film that is easy to tear, and a synthetic resin that can be heat-sealed to the brim of the opening of the container body. Since it has a layer, it can be sealed by heat-sealing it to the container body, and since the lid base is oriented in one direction and is easy to tear, it is not possible to tear the lid to form an opening. can.

In addition, a cut is made in the lid material in a direction perpendicular to the orientation direction of the lid base material, and half of the tear piece is inserted and glued into this cut, and the cut and the inserted tear piece are attached to the backlight material. Since it is covered with
When forming an opening, by pinching and pulling the tear piece protruding outward from the lid material, an opening corresponding to the width of the tear piece can be easily formed.

In addition, the lid material is obtained by cutting the laminated film, making cuts, inserting tear pieces, stacking the backing material, and heat-sealing the film, making it easy to manufacture and inexpensive.

[Brief explanation of drawings]

1 and 2 are a sectional view and a plan view showing an example of the sealed container of the present invention, FIG. 3 is an enlarged sectional view taken along line I-1 in FIG. 2, and FIG. 4 is the same as in FIG. 1. FIG. 5 is a perspective view showing a state in which an opening is formed in a sealed container, and FIGS. 5 and 6 are plan views showing different examples. 1... Container body, 11... Outer layer, 12
...Inner layer, 13...Tsuba, 2...
- Lid material, 21... Lid base material, 22... Synthetic resin layer, 23... Surface layer, 24...
Cut line, 3...Tear piece, 4...Backing material,
33, 41, 42... Adhesive part.

Claims (1)

[Scope of Claims] 1. The lid base material is made of a film oriented in one direction and easily torn, and the lid material has a synthetic resin layer that can be heat-sealed to the flange of the opening of the container body on one side of the lid base material. The opening of the lid is heat-sealed and sealed, and a cut is made in the lid material over a predetermined width in a direction intersecting the orientation direction of the lid base material, and the lid material is pulled from the cut in the orientation direction of the lid base material. Half of the tear piece is inserted and adhered to the synthetic resin layer on the inner surface of the lid, the cut and the inserted and glued tear piece are covered with a backing material, and this backing material is attached to the synthetic resin layer on the inner surface of the lid around the tear piece. 2. A patent claim in which the adhesive strength between the tear piece and the synthetic resin layer of the lid material is greater than the adhesive strength between the lining material and the synthetic resin layer of the lid material. 3. A patent in which the opening is provided obliquely to the orientation direction of the lid base material, and notches are provided at both ends of the cut toward the orientation direction of the lid base material. A sealed container according to claim 1 or 2.