JPH0414380Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is an inner seal material for sealing the mouth of a container filled with coffee powder, cream powder, flavored salt, chemical seasonings, etc. It is related to.

``Prior Art'' For example, an inner sealing material for sealing the mouth of a container filled with coffee powder, cream powder, etc. is attached to the mouth of the container in order to protect the contents from moisture.

After the inner sealing material is secured to the inside of the cap, the cap is fitted onto the container opening and at the same time the back side of the inner sealing material is adhered to the container opening. The reseal layer and the seal layer are separated by rotating the cap to remove it from the container.

For example, as illustrated in FIG.
, and glassine paper 4 is laminated with an extrusion coat layer 3 of polyolefin resin on the back side.
A metal foil 5 such as foil is bonded to an adhesive layer 6 made of wax.
In a container in which an inner sealing material 1 having a laminated structure is adhered to the mouth of the container using adhesives and laminated layers, when the cap 7 is rotated to remove it from the container, as shown in FIG. As shown in FIG. , remains glued to the container opening.

In addition, in FIGS. 1 and 2, the part indicated by the reference numeral 11 is the anchor coat layer for printing formed on the surface of the metal foil 5, and the part indicated by the reference numeral 12 is the anchor coat layer. This is the printed pattern part attached to page 11.

``Problem to be solved by the invention'' In a container in which the conventional inner sealing material having the above-mentioned structure is adhered to the container mouth, when the inner seal material in the container is used, after the cap 7 is removed, , the sealing layer 9 attached to the container opening 10 is removed.

Therefore, the remaining contents inside the container are protected only by the reseal layer 8 loaded inside the cap 7, which has the disadvantage that its moisture-proofing function is not sufficient. There is.

Further, after the inner seal material is loaded inside the cap, the back surface of the inner seal material is brought into close contact with the tip of the container mouth at the same time as the cap is fitted to the container mouth. Therefore, since it is first applied to the tip of the container mouth and fixed to the container mouth, the tip of the container mouth may not have good smoothness, or the container may have only one sheet of inner seal material. If the thickness of the part that comes into contact with the tip of the mouth is not uniform, the tightness between the back side of the inner seal and the tip of the container mouth may be affected by the rigidity of the inner seal itself. This may result in insufficient adhesion between them.

In particular, one-touch type caps, such as those described in Japanese Patent Publication No. 55-34071, in which the cap is pressed against the container mouth from above the container mouth, are used to create a connection between the cap and the container mouth. In the case of a one-touch type cap in which fitting is performed, the closeness between the back side of the inner seal material loaded inside the cap and the tip of the container mouth should be adjusted as in the case of a rotary type cap. Since it cannot be adjusted by the amount of rotation of the cap,
The tip of the container opening may not be smooth enough,
Due to uneven thickness of the part of the inner seal material that contacts the tip of the container mouth, poor adhesion between the inner seal material and the container mouth may occur due to rotation. This is more than in the case of formula caps.

Furthermore, the inner seal material having the above-mentioned configuration,
The adhesive strength between the reseal layer and the reseal layer is high, and especially when used in one-touch type caps, the angle required to open the cap is small, so the seal layer and reseal layer do not peel off at a designated area. In some cases, they remain in one piece at the mouth of the container.

Note that if the adhesive strength of the wax layer is weakened in order to weaken the adhesive strength between the reseal layer and the seal layer, the reseal layer and the seal layer will separate before loading the inner seal material inside the cap. Mistakes such as this occur.

On the other hand, the present invention does not have the above-mentioned defects in the conventional inner seal material for sealing the mouth of a container, and has sufficient cushioning properties due to the presence of the core layer in the reseal layer. For,
Not only does it have good resealability properties, but it also improves the clearance between the container opening and the inside surface of the cap when the inner sealing material loaded inside the cap adheres to the container opening. To provide an inner sealing material which is large in size and free from the risk of poor contact between the container opening and the inner sealing material caused by inappropriate fitting of a cap to the container opening.

Further, in the present invention, the adhesive strength between the reseal layer and the seal layer can be adjusted as appropriate by the spot-shaped adhesive layer located between them.
During the handling process until the inner seal material is adhered to the container mouth, there may be cases where a part of the reseal layer and seal layer peels off or separates, or wrinkles occur, etc. In addition, even in the case of a one-touch cap that requires a small rotation angle to open the cap, the seal layer and reseal layer can be neatly separated at a predetermined location by rotating the cap. Provided is an inner sealing material for sealing the mouth of a container that separates.

"Means for solving the problem" The inner seal material for sealing the container mouth of the present invention is
The reseal layer and the seal layer are formed of a laminate partially bonded by a spot-like adhesive layer located between the bottom layer of the reseal layer and the top layer of the seal layer.

The resealable layer in the laminate includes an uppermost layer made of paperboard or a breast ball, a first core layer made of a wax layer, a second core layer made of foamed plastic, and an uppermost layer made of a polyolefin resin layer. The sealing layer has a top layer made of a synthetic resin that has a weak affinity for the polyolefin resin layer that forms the bottom layer of the resealing layer, and a center core made of Al foil. layer and
It has a bottom layer made of polyolefin resin that can be heat-sealed to the container mouth.

The adhesive layer arranged in spots between the uppermost layer of the sealing layer and the lowermost layer of the resealing layer is made of a resin having good affinity for the polyolefin resin forming the lowermost layer of the resealing layer. The adhesive strength (easy peelability) between the reseal layer and the seal layer is adjusted by the area of the adhesive layer.

In the inner seal material for sealing the mouth of a container of the present invention having the above structure, the first core layer made of a wax layer and the second core layer made of foamed plastic in the reseal layer are the uppermost layer in the reseal layer. As long as it is located between the lowest layer and the lowest layer, it does not matter whether it is placed above or below the middle layer.

The uppermost layer in the sealing layer, that is, the uppermost layer formed of a synthetic resin that has a weak affinity for the polyolefin resin layer forming the lowermost layer in the resealing layer, exhibits mold releasability for the polyolefin resin layer. Synthetic resins, such as nitrocellulose resins, polyamide resins, acrylic resins, rubber resins, polyester resins, polyurethane resins, polyvinyl chloride resins, mixtures thereof, and single substances of the above resins. Alternatively, it is formed by a mixture in which silicone is further added to the mixture.

When the uppermost layer of the sealing layer mentioned above is formed of a mixed resin containing a silicone resin, the mold release performance of the uppermost layer with respect to the lowermost layer consisting of a polyolefin resin layer is determined by the mold release performance of the uppermost layer. Since it is enhanced by the silicone resin, peeling between the reseal layer and the seal layer becomes extremely easy, and it is suitable as an inner seal material applied to, for example, one-touch type caps.

The bottom layer in the sealing layer is Al in the sealing layer.
It not only improves the tear resistance and puncture resistance of the foil, but also provides suitability for thermal bonding when bonding the inner sealing material to the container mouth.

The partial adhesive layer located between the reseal layer and the sealing layer is made of a synthetic resin that has good affinity for the reseal layer and the polyolefin resin layer that forms the bottom layer.
For example, it is formed from chlorinated polypropylene, ethylene-vinyl acetate copolymer, or a mixed resin thereof.

The total area of the partial adhesive layer depends on the degree of affinity of the adhesive layer with the polyolefin resin layer that forms the bottom layer of the resealing layer, and the capacity of the cap when opening (closing) the container to which the inner sealing material is applied. Before the inner seal material is loaded onto the inner surface of the cap, the reseal layer is determined by the rotation angle of so that it forms about 5 to 15% of the area between the layer and the seal layer,
It is preferable that it is applied in a substantially uniform spot shape.

"Example" Hereinafter, the specific structure of the inner seal material for sealing the mouth of a container according to the present invention will be described based on the drawing examples.

In the inner sealing material 31 for sealing the mouth of a container, which is an embodiment of the present invention illustrated in FIG. A first core layer 34 made of a wax layer laminated with an agent layer 33 in between, and the first core layer 34
A second core layer 36 made of foamed plastic is bonded to one side of the plastic via an adhesive layer 35 made of a polyolefin resin layer, and an adhesive layer made of a polyolefin resin layer is attached to one side of the second core layer 36. 3
A reseal layer 39 is formed in a laminated structure with a bottom layer 38 made of a polyolefin resin layer laminated with a layer 7 interposed therebetween.

Further, the sealing layer indicated by the reference numeral 45 includes an uppermost layer 40 made of a synthetic resin that has no affinity for the polyolefin resin forming the lowermost layer 38 of the resealable layer 39, and a polyolefin resin on one side of the uppermost layer 40. A core layer 42 made of aluminum foil is laminated with an adhesive layer 41 made of a resin layer interposed therebetween, and a polyolefin layer 42 is laminated on one side of the core layer 42 with an adhesive layer 43 made of a polyolefin resin layer laminated therebetween. It has a laminated structure with a bottom layer 44 made of resin.

The reseal layer 39 and the seal layer 45 are partially bonded together by an adhesive layer 46 formed in a spot shape between the top layer 40 of the seal layer 45 and the bottom layer 38 of the reseal layer 39.

Note that in FIG. 3, a portion indicated by the reference numeral 47 is a printed pattern portion attached to the back surface of the uppermost layer 40 in the seal layer 45.

The inner seal material for sealing the container opening of the present invention having the above-mentioned structure includes, for example, a laminated sheet having a laminated structure corresponding to the reseal layer 39 having an adhesive layer 46 on the back surface, and the uppermost layer 40 of the seal layer 45. This can be easily obtained by bonding a laminated sheet corresponding to the missing structure with a synthetic resin layer interposed therebetween, which corresponds to the uppermost layer 40.

"Operation and Effects" The inner seal material for sealing the container mouth of the present invention is
The reseal layer is laminated with a partial adhesive layer so that the back surface of the reseal layer, which has a packing effect, and the surface of the seal layer, which has moisture-proof properties, are in contact with each other. is separated.

The function of the inner sealing material for sealing the mouth of a container according to the present invention will be explained with reference to FIG. 4 based on the structure of the inner sealing material 31 which is an example product shown in FIG. 3.

In FIG. 3, the inner seal material 31 is attached to the cap 51 with the seal layer 44 side of the inner seal material 31 facing the container opening 50.
After loading the inner surface of the container, the cap 51 is inserted into the container opening 5.
0 and heat the inner seal material 3.
The inner sealing material 31 is fixed to the container opening 50 by adhering the lowermost layer 44 forming the back layer 1 to the container opening 50.

When the cap 51 is removed when the contents inside the container are consumed, the reseal layer 39 and the seal layer 45 of the inner seal material 31 are separated, leaving only the seal layer 45 adhered to the container opening 50. The rest of the reseal layer 39 remains locked to the inner surface of the cap 51.

After the seal layer 45 is peeled off from the container opening 50 and part of the filling inside the container is consumed,
Reseal layer 39 remaining on the inner surface of the cap 51
The sealing inside the container is measured by this.

In the inner sealing material for sealing the container mouth of the present invention, the reseal layer includes a first core layer made of a wax layer and a second core layer made of foamed plastic, and the cap The moisture-proofing effect of the reseal layer remaining on the inner surface of the wax layer is achieved by the wax layer, and the seal retention is achieved by the sufficient cushioning properties provided by both the paperboard or breast ball and the foamed plastic. It will be done.

In addition, in the inner seal material for sealing the container mouth of the present invention, when adhering the inner seal material loaded inside the cap to the container mouth,
The tip of the container mouth is not smooth enough,
Alternatively, even if there is some variation in the thickness of the part of the inner seal material that contacts the tip of the container mouth, the inner seal material may be made of foamed plastic present in the reseal layer. Due to the sufficient cushioning properties of the second core layer,
Insufficient smoothness of the tip of the container mouth and variations in the thickness of the part of the inner seal material that contacts the tip of the container mouth are absorbed, so that the back surface of the inner seal material and the container mouth are smooth. The closeness between the inner seal material and the tip of the container is improved, and poor adhesion between the inner seal material and the container opening is avoided.

In particular, in one-touch type caps, the degree of contact between the back surface of the inner sealing material loaded inside the cap and the tip of the container opening cannot be adjusted by changing the amount of rotation of the cap.
Insufficient smoothness of the tip of the container mouth provided by the second core layer made of foamed plastic present in the reseal layer and the tip of the container mouth of the inner sealing material. Utilizing the effect of absorbing variations in the thickness of the part that contacts the
This is extremely effective.

In addition, in the inner seal material for sealing the container mouth of the present invention, since the lowest layer of the inner seal material is formed of a polyolefin resin layer, the adhesion of the inner seal material to the container mouth is controlled by the inner seal material. It can be done using a heat sealing method using high-frequency induction heating, etc., which does not cause the filling material to absorb moisture during adhesion, so it has good moisture resistance, and the process of adhering to the container mouth is simple. can be done.

Furthermore, the polyolefin resin layer forming the bottom layer of the inner seal material for sealing the container mouth improves the tear resistance and puncture resistance of the Al foil in the seal layer.

Furthermore, in the inner seal material for sealing the container mouth of the present invention, the adhesive strength between the reseal layer and the seal layer is adjusted as appropriate by the spot-shaped adhesive layer located between them. Therefore, during the handling process until the inner seal material is bonded to the container mouth, a portion of the reseal layer and seal layer may peel off or separate, wrinkles may occur, etc. This eliminates clumsiness.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing an example of the laminated structure of a conventional inner seal material for sealing the mouth of a container, and FIG.
FIG. 1 is a model cross-sectional view showing the separated state of the inner seal material when the cap is removed from the container to which the inner seal material for sealing the container mouth is adhered, and FIG. 3 is a cross-sectional view of the container according to the present invention. FIG. 4 is a partial cross-sectional view showing an example of the laminated structure of the inner seal material for sealing the mouth of the container, when the cap is removed from the container shown in FIG. It is a sectional view of the model showing a removed state. 31...Inner sealing material for sealing the container mouth, 3
2...Top layer of paperboard or breast ball, 34
...First core layer consisting of wax layer, 36...
A second core layer of foamed plastic, 38...
...Lowest layer made of polyolefin resin, 39...
reseal layer 40...a top layer formed of a synthetic resin with weak affinity for the bottom layer 38;
42... Core layer made of Al foil, 44... Bottom layer made of polyolefin resin that can be heat-sealed to the container mouth, 45... Seal layer, 46... Partial adhesive layer.

Claims (1)

[Scope of utility model registration request] a resealing layer having a top layer made of paperboard or breast plug balls, a first core layer made of a wax layer, a second core layer made of foamed plastic, and a bottom layer made of a polyolefin resin layer;
The top layer is made of a synthetic resin that has a weak affinity for the polyolefin resin layer that forms the bottom layer of the reseal layer, the core layer is made of Al foil, and the top layer is heat-sealable to the container mouth. a sealing layer having a bottom layer made of a polyolefin resin; the sealing layer having a bottom layer made of a polyolefin resin is partially adhered by an adhesive layer arranged in spots between the top layer of the sealing layer and the bottom layer of the resealing layer; Moreover, the container opening is characterized in that the adhesive layer arranged in the spot shape is formed of a resin having good affinity for the polyolefin resin forming the lowest layer in the resealing layer. Inner seal material for sealing.