JPH0472155A - Heat sealable container - Google Patents

Abstract

PURPOSE:To make unsealing operation extremely easy and efficient and remove a seal material completely from the neck part of a container body by making the adhesive strength between the lower face of a ring-like part and the upper face of a seal material is made larger than that between the upper face of the neck part of the container body and the lower face of the seal material. CONSTITUTION:A seal material 2 is heat bonded to the upper face of a neck part 10 of a container body 1. A lifting member 3 consists of a tab 31 and a ring-like part 32 and the lower face of the ring-like part 32 is heat bonded to the upper surface of the seal material 2. The width of neck part 10 of the container body 1 is made smaller than the width of the lower face of the ring- like part 32 and an annular width W1 is made larger than an annular width W2. Therefore, when the tab 31 of the lifting member 3 is pulled up, since the adhesive strength between the lower face of the ring-like part 32 and the upper face of the seal material 2 becomes larger than that between the upper face of the neck part 10 of the container body 1 and the lower face of the seal material 2, a separation takes place between the neck part 10 of the container body 1 and the seal material 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat-sealed container whose sealing material can be easily peeled off.

(Prior Art) In a conventional heat-sealed container, as described in Japanese Patent Publication No. 49-25869, the lower surface of a sealing material having a metal layer as an upper layer and a thermoplastic resin layer as a lower layer is attached to the container body. It is generally known that the upper surface of the mouth is heat-sealed.

(Problem to be Solved by the Invention) However, in such conventional heat-sealed containers, when opening the mouth of the container body, a small portion of the end of the sealing material, which is the part to be adhered, is touched with a fingertip. Because the product is designed to be peeled off by pinching, it is difficult for the elderly, children, and people with long fingernails to open the package, and it is extremely inefficient for people who have to open large quantities. Ta. Furthermore, if the width of the bonded portion is wide, when high frequency induction heating is used for thermal fusion, the bonded portion will be excessively heated and burnt, resulting in an unsightly appearance.

In addition, Japanese Patent Application Laid-Open No. 52-148389 and Japanese Patent Application Laid-open No. 52-1
As described in Japanese Patent No. 48388, there is also known a heat-sealed container in which a tab is heat-sealed to the top surface of the sealing material, and by pulling up the tab, the heat-sealed area with the tab is broken. However, in this case, even after the container is opened, broken pieces of the sealing material remain at the mouth of the container body, so the liquid content tends to remain, and if the liquid content is drinking water, it may hurt the lips of the person drinking it. There is a fear.

The present invention has been made by focusing on the above-mentioned conventional problems.
For heat-sealed containers in which a sealant is heat-sealed to the mouth of the container body, opening is extremely easy and efficient, and the sealant can be completely removed from the mouth of the container body for safe and efficient use. The challenge is to make it possible to drink it (drinkable).

(Means for Solving the Problems) In order to solve the above problems, in the heat sealing container of the present invention, a tab is provided on the top surface of the sealing material, and the sealing material is not broken, but the opening of the container body It was used as a means to be peeled off from the surface.

That is, in the heat-sealable container according to claim 1, the sealing material has a metal layer as an intermediate layer and a thermoplastic resin layer as both outermost layers.
A lifting member made of thermoplastic resin, which is heat-sealed to the upper surface of the opening of the container body, and is made of a tab and a ring-shaped portion connected to the tab, is heat-sealed to the upper surface of the sealing material at the ring-shaped lower surface. In the heat-sealable container, the adhesive strength between the ring-shaped lower surface and the sealing material upper surface is set to be greater than the adhesive strength between the mouth upper surface of the container body and the sealing material upper surface. It is characterized by being

As a means for setting the adhesive strength between the ring-shaped lower surface and the upper surface of the sealing material to be greater than the adhesive strength between the upper surface of the opening of the container body and the upper surface of the sealing material,
The annular width of the heat-sealed region between the ring-shaped lower surface of the lifting member and the upper surface of the sealing material may be formed to be larger than the annular width of the heat-sealed region between the upper surface of the opening of the container body and the upper surface of the sealant. preferable.

Further, in the heat-sealable container according to claim 3, in the heat-sealable container according to claim 1 or 2, the heat-sealed region between the ring-shaped lower surface of the pulling member and the upper surface of the sealing material is between the ring-shaped portion and the tab. It is characterized by being narrower at a position close to the connecting part than at other parts, and being unevenly distributed toward the outer edge.

Furthermore, in the heat seal container according to claim 4, claim 1,
In the heat-sealable container according to item 2 or 3, a plurality of grooves are formed on the upper surface of the ring-shaped part of the pulling member, and extend in a direction perpendicular to a diameter line of the ring-shaped part passing through a connection part between the ring-shaped part and the tab. It is characterized by

(for production) The invention according to claims 1 to 4 will be explained in detail.

In the heat-sealable container according to any one of claims 1 to 4, the adhesive strength between the ring-shaped lower surface and the sealing material upper surface is greater than the adhesive strength between the mouth upper surface of the container body and the sealing material upper surface. Therefore, when the tab of the lifting member is pulled up, separation occurs between the opening of the container body and the sealing material.

Therefore, since the mouth of the container body can be opened by peeling off the gap between the mouth of the container body and the sealing material, the sealing material can be completely removed from the mouth of the container body together with the lifting member.

Next, in the heat-sealed container according to claim 3, which is characterized by the unique effect of the invention described in claim 3, the heat-sealed region between the ring-shaped lower surface of the lifting member and the sealing material upper surface is formed between the ring-shaped portion and the tab. The width is narrower in the vicinity of the connecting portion than the other portions, and the tab is unevenly distributed toward the outer edge, so that the force for pulling up the tab acts intensively on the outer edge of the ring-shaped portion. Therefore, the force needed to start peeling off is small, and since the peeling between the mouth of the container body and the sealant starts from the outer periphery of the heat-sealed area, it is possible to prevent the sealant from breaking. can do.

Finally, in the heat-sealing container according to claim 4, which is characterized by the unique effect of the invention according to claim 4, the peeling between the opening of the container body and the sealing material passes through the connecting portion between the ring-shaped portion and the tab. Whereas the sealing is performed in the direction along the diameter line of the ring-shaped part, the upper surface of the ring-shaped part of the pulling member is formed with a plurality of grooves extending in a direction perpendicular to the diameter line. The rebound resilience when the material leaves the container mouth is reduced.

That is, when the sealing material is separated from the mouth of the container, the contents attached to the lower surface of the sealing material can be prevented from scattering due to the rebound resilience of the sealing material.

(Example) Embodiments of the present invention will be explained in detail with reference to the drawings.

First, the configuration of the embodiment will be explained based on FIGS. 1 to 5.

FIG. 1 shows a longitudinal sectional view of a heat-sealed container according to an embodiment of the present invention.

As shown in FIG. 1, the heat-sealed container includes a container body 1 made of synthetic resin, a sealing material 2 that seals an opening 10 of the container body 1, and a sealing material 2 that seals the opening of the container body 1 when the container is opened. It is comprised of a lifting member 3 for pulling up from the container body 1, and a cap 4 for protecting the mouth part 10 of the container body 1.

The container body 1 has an opening 10 formed thinner than a body 11, and a threaded portion 12 formed on the outer surface of the opening 10.

The sealing material 2 is, for example, made of aluminum foil and thermoplastic resin (
It is formed by applying or laminating hot melt adhesive. Partly, the sealing material 2 has a metal layer 21 as an intermediate layer, thermoplastic resin layers 22 and 23 as both outermost layers, and is thermally fused to the upper surface of the mouth 10 of the container body 1.

The pulling member 3 is a molded product made of thermoplastic resin,
As shown in FIGS. 2 and 3, the tab 31 and the tab 31
The lower surface of the ring-shaped portion 32 is heat-sealed to the upper surface of the sealing material 2. Further, this pulling member 3 has a ring-shaped portion 3
A connecting portion 33 between the tab 31 and the tab 31 is raised from the ring-shaped portion 32 at a right angle, and a step is formed between the tab 31 and the ring-shaped portion 32. Furthermore, the tab 31 of the pulling member 3 is formed into a ring shape, and a finger can be inserted into the tab 31.

Further, the pulling member 3 has a plurality of grooves 35 on the upper surface of the ring-shaped portion 32 extending in a direction perpendicular to the diameter line of the ring-shaped portion 32 passing through the connecting portion 33 between the ring-shaped portion 32 and the tab 31.
is formed on the outer surface of the ring-shaped portion 32,
A thin collar 36 is formed (see FIG. 2). Note that the cross-sectional shape of the groove 35 may be V-shaped or may be an inverted trapezoidal shape.

Furthermore, the pulling member 3 has an annular width W of the other portion where the heat-sealed region between the lower surface of the ring-shaped portion 32 and the upper surface of the sealing material 2 is located close to the connecting portion 33 between the ring-shaped portion 32 and the tab 31;
It is narrowed to about 1/2 to 2/3 of the width of the tab 32 and is unevenly distributed toward the outer edge. A notch 34 is provided on the inner edge of the portion close to the connecting portion 33.
is formed (see Figure 3).

The cap 4 is a molded product made of synthetic resin, and has a top portion 41.
and a skirt portion 42 extending downward from the outer periphery of the top portion 41. The cap 4 has a threaded part 43 formed on the inner surface of the lower part of the skirt part 42, and this threaded part 43 is screwed into the threaded part 12 formed in the mouth part 10 of the container body 1. A cap is attached to the mouth part 10 of. Furthermore, a contact ring 44 having approximately the same diameter as the upper end of the mouth 10 of the container body 1 is protruded from the inner surface of the top portion 41, and a contact ring 44 having approximately the same diameter as the upper end of the mouth portion 10 of the container body 1 is provided on the inner surface of the upper portion of the skirt portion 42. A protrusion 45 is formed at a slightly lower position. The adhesive strength between the lower surface of the ring-shaped portion 32 and the upper surface of the sealing material 2 is set to be greater than the adhesive strength between the upper surface of the opening 10 of the container body 1 and the lower surface of the sealing material 2. has been
As a means to prevent this, the width of the opening 10 of the container body 1 is made narrower than the width of the lower surface of the ring-shaped portion 32, and the heat-sealed area between the lower surface of the ring-shaped portion 32 of the lifting member 3 and the upper surface of the sealing material 2 is made. The annular width W1 is larger than the annular width W2 of the heat-sealed region between the upper surface of the mouth 10 of the container body 1 and the lower surface of the sealing material 2 (see FIGS. 4 and 5).

Next, the operation of the embodiment will be explained based on FIGS. 6 to 11.

First, an example of the method for sealing the container will be explained based on FIGS. 6 to 8.

First, as shown in FIG. 6, the pulling member 3 is inserted into the cap 4 from the tab 31 side, and after the pulling member 3 is inserted, the sealing material 2 is inserted into the cap 4. At this time, the lifting member 3 and the sealing material 2 are prevented from being removed and removed because the peripheral edge of the sealing material 2 is engaged with the protrusion 45 formed on the skirt portion 42 of the cap 4. The lateral movement of the collar 3 of the ring-shaped part 32
The tip of the cap 4 is regulated by hitting the inner surface of the skirt portion 42 of the cap 4.

Next, as shown in FIG. 7, a cap 4 is placed on the mouth of the container body 1 filled with the contents and tightened. Then, the lifting member 3 inserted inside the cap 4
and the sealing material 2 are supported under pressure between the upper surface of the mouth 10 of the container body 1 and the lower surface of the contact ring 44 of the cap 4, so that the lower surface of the sealing material 2 and the upper surface of the mouth 10 of the container body 1 are uniformly in close contact with each other. At the same time, the lower surface of the ring-shaped portion 32 of the pulling member 3 and the upper surface of the sealing material 2 are evenly brought into close contact.

Thereafter, as shown in FIG. 9, the cap 4 of the container is irradiated with high frequency waves by the high frequency induction heating device 5, and the sealing material 2
heats the metal layer of the thermoplastic resin layer 22 of the sealing material 2.
．． 23 is softened and melted by heat conduction, and the upper surface of the mouth 10 of the container body 1 and the ring-shaped part 32 of the lifting member 3 are
The contact portion of the lower surface with the sealing material 2 is also softened and melted by heat conduction. Thereafter, it is left to cool, and the lower surface of the sealing material 2 and the upper surface of the mouth portion 10 of the container body 1 are heat-sealed, and the upper surface of the sealing material 2 and the lower surface of the ring-shaped portion 32 of the lifting member 3 are heat-sealed. The container is sealed by these thermal fusions. still,
In FIG. 9, 51 is a high frequency oscillator, 52 is a heating coil, 53 is a Bakelite cover, 54 is a belt conveyor, 55 is a guide member, and this high frequency induction heating device 5 includes:
The cap 4 of the container passes under the heating coil 52 in close proximity, and the heating coil 52
It is formed in a track shape having a short axis approximately the same as the diameter of the opening 10 of the container body, so that the container can be reliably sealed by fusion.

In addition, in order to finish the high frequency irradiation time in a short time (about 1 second), the surface thermoplastic resin layers 22 and 23 of the sealing material 2 are
It is desirable to use adhesives with low melting points. For example, when the material of the lifting member 3 is polyethylene and the material of the container body 1 is polypropylene, the thermoplastic resin layer 22 on the upper surface side of the sealing material 2 is made of low-density polyethylene, and the thermoplastic resin layer 22 on the lower surface side of the sealing material 2 is made of polyethylene. The resin layer 23 is preferably made of EVA sealant.

FIGS. 9 to 11 are longitudinal sectional views showing the progress of the unsealing operation of the heat-sealed container.

When opening the container, first, as shown in Figure 9,
The cap 4 is removed, and then the tab 31 of the lifting member 3 is pulled up with a finger.

When the tab 31 of the lifting member 3 is pulled up, the adhesive strength between the lower surface of the ring-shaped portion 32 and the upper surface of the sealing material 2 changes to the adhesive strength between the upper surface of the opening 10 of the container body 1 and the lower surface of the sealing material 2. Since it is set larger than the 10th
As shown in the figure, separation occurs between the opening 10 of the container body 1 and the sealing material 2. Therefore, the mouth part 10 of the container body 1 can be opened by peeling off the gap between the mouth part 10 of the container body 1 and the sealing material 2. As shown in FIG. It can be completely removed from the mouth part 10 of 1.

As mentioned above, in the heat-sealed container of this embodiment, the opening 10 of the container body 1 can be opened by pulling up the tab 31, so the opening operation is easy and efficient, and moreover, when opening, Seal material 3 from mouth 10 of container body 1
Since it is completely removed, it can be used (drinkable) safely and efficiently.

Further, the thermally fused area between the lower surface of the ring-shaped portion 32 of the pulling member 3 and the upper surface of the sealing material 2 becomes narrower at a position near the connecting portion 33 between the ring-shaped portion 32 and the tab 31 than at other portions. , are formed so as to be unevenly distributed toward the outer edge side, so that the force for pulling up the tab 31 acts intensively on the outer edge portion of the ring-shaped portion 32. Therefore, only a small force is required at the time of starting the peeling, and since the peeling between the opening 10 of the container body 1 and the sealing material 2 starts from the outer periphery of the heat-sealed area, the sealing material 2 is not broken. This can be prevented from occurring.

Furthermore, peeling between the opening 10 of the container body 1 and the sealing material 2
Whereas the process is carried out in the direction along the diameter line of the ring-shaped part 32 passing through the connecting part 33 between the ring-shaped part 32 and the tab 31,
Since a plurality of grooves 35 extending in a direction perpendicular to the diameter line are formed on the upper surface of the ring-shaped portion 32 of the lifting member 3, the rebound resilience when the sealing material 2 is separated from the container opening 10 is small. Become. That is, when the sealing material 2 is separated from the mouth portion 10 of the container body 1, the contents attached to the lower surface of the sealing material 2 can be prevented from scattering due to the rebound resilience of the sealing material 2.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change within the scope of the gist of the present invention, it is included in the present invention. .

For example, in the embodiment, the connecting part 33 between the ring-shaped part 32 and the tab 31 is made to stand up to create a step between the tab 31 and the ring-shaped part 32. The portion 32 and the tab 31 may be arranged on the same plane.

Further, in the embodiment, the tab 31 is formed into a ring shape, but the shape of the tab 31 is not limited to the embodiment, and may be formed into a claw shape, for example.

Furthermore, in the embodiment, the adhesive strength between the lower surface of the ring-shaped portion 32 and the upper surface of the sealing material 2 is determined by
As a means for setting the adhesive strength between the upper surface and the lower surface of the sealing material 2 to be greater than the adhesive strength, the annular width of the heat-sealed region between the lower surface of the ring-shaped part 32 of the lifting member 3 and the upper surface of the sealing material 2 is set to be larger than the adhesive strength between the upper surface and the lower surface of the sealing material 2 The thermoplastic resin layer 22, 23 used as the amphoteric layer of the sealing material 2 is formed so as to be larger than the annular width of the heat-sealed region between the upper surface of the mouth portion 10 and the lower surface of the sealing material 2.
It may be adjusted by adjusting the balance of adhesive strength.

(Effects of the Invention) As described above, in the heat-sealed containers according to claims 1 and 2, the opening of the container body can be opened by pulling up the tab, so the opening operation is easy and efficient. . Moreover, since the sealing material is completely removed from the mouth of the container body when the container is opened, the container can be used (drinked) safely and efficiently.

Furthermore, in the heat seal container according to claim 3 or 4, the following effects can be obtained in addition to the above effects.

In the heat-sealed container according to claim 3, the force for pulling up the tab acts intensively on the outer edge of the ring-shaped portion, so that the force required at the start of peeling is small, and the force on the container body is small. Since the peeling between the mouth portion and the sealing material starts from the outer periphery of the heat-sealed region, it is possible to prevent the sealing material from breaking.

Further, in the heat-sealable container according to claim 4, when the sealant is separated from the mouth of the container, the contents attached to the lower surface of the sealant can be prevented from scattering due to the rebound resilience of the sealant. This effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a heat-sealed container according to an embodiment of the present invention, FIG. 2 is a plan view showing a lifting member applied to the heat-sealing container, and FIG. 3 is a bottom view showing the lifting member. Fig. 4 is an enlarged view of the main part 1 in Fig. 1, Fig. 5 is an enlarged view of the main part V in Fig. 1, Figs. Figure 9 ~ 1st
FIG. 1 is a longitudinal sectional view showing the progress of the unsealing operation of the heat-sealed container. 1... Container body 10... Mouth 2... Sealing material 21... Metal layer 22, 23... Thermoplastic resin layer 3... Pulling member 31... Tab 32... Ring Shaped portion 33... Connecting portion 34... Notch 35... Groove Fig. 1 - Container body 21... Gold lN 22.23... Thermoplastic resin layer

Claims (1)

[Scope of Claims] 1) A sealing material having a metal layer as an intermediate layer and thermoplastic resin layers as both outermost layers is thermally fused to the upper surface of the opening of the container body, and includes a tab and a ring connected to the tab. A thermoplastic resin lifting member comprising a ring-shaped lower surface is heat-sealed to the sealing material upper surface, and the ring-shaped lower surface and the sealing material upper surface are connected by heat-sealing. A heat-sealed container, wherein the adhesive strength between the upper surface of the opening of the container body and the lower surface of the sealant is set to be greater than the adhesive strength between the upper surface of the mouth of the container body and the lower surface of the sealing material. 2) The annular width of the heat-sealed region between the ring-shaped lower surface of the lifting member and the upper surface of the sealing material is formed to be larger than the annular width of the heat-sealed region between the upper surface of the mouth of the container body and the lower surface of the sealant. The heat seal container according to claim 1. 3) The heat-sealed region between the ring-shaped lower surface of the pulling member and the sealing material upper surface becomes narrower than other portions at a position near the connecting portion between the ring-shaped portion and the tab, and is unevenly distributed toward the outer edge side. The heat seal container according to claim 1 or 2, which is formed as follows. 4) A plurality of grooves are formed on the upper surface of the ring-shaped part of the pulling member, the grooves extending in a direction perpendicular to the diameter line of the ring-shaped part passing through the connecting part of the ring-shaped part and the tab. 3. The heat sealing container according to 3.