JPH1135028A - Internal pressure resistant composite vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal pressure resistant composite vessel which is not excessively deformed owing to an increase or decrease in the internal pressure of the vessel and has good sealing characteristics and can be easily used. SOLUTION: A paper vessel 110 in which a bottom board 112 is joined to the lower part of the inside of a body part 111 comprising a laminated material having a paper layer, as a main body layer, and having a thermoplastic resin layer at least on the inner side of the vessel, is mounted at a predetermined location in an injection molding die and molten thermoplastic resin is injected into a cavity to form an open periphery frame 121 on an opening at the top end of a body of the paper vessel. And a column-shaped protection frame 122 is provided on a vertical bonded part of the part 111 on the inner side of the vessel and an annular protection frame 123 is provided on a bonded part of the part 111 and the board 112 to form a vessel body 100. An opening 130 of the body 100 is sealed with a cover material 200 using thermally welded parts 101, 201 and fitting parts 102, 202 to form a composite vessel, and at least one of the parts 102, 202 is located on the side of the center of the vessel with respect to the parts 101, 201 in the axial direction of the vessel body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when used for contents such as beverages containing carbonic acid and contents requiring heat sterilization, resists an increase or decrease in the internal pressure in a container and has good sealing performance. The present invention relates to an internal pressure composite container.

[0002]

2. Description of the Related Art Heretofore, as a container for yogurt, fruit juice beverage, sake, etc., a fan-shaped trunk blank made by stamping a laminated material mainly composed of a paper layer is wound into a cylinder to form a trunk. A cup-shaped paper container has been used in which a circular bottom plate blank obtained by punching a laminated material downward is combined, and the lower peripheral edge of the body and the peripheral edge of the bottom plate are heated and tightened. However, in this cup-shaped paper container, it is difficult to obtain a sufficient container sealing property due to the step of the bonding portion of the body when the lid is attached to the opening at the upper end of the body.

Therefore, in order to improve the sealing property of the container with the lid material, for example, Japanese Patent Application Laid-Open No. 8-207175 discloses a method in which a cup-shaped paper container is loaded into an injection mold and a thermoplastic resin is injected. As shown in FIG. 9, the cup-shaped paper container (31)
0) an opening peripheral frame (321) at an opening (330) at the upper end of the body (311), and a columnar protective frame (322) continuous with the opening peripheral frame at a bonding portion of the body on the inner surface side of the container. There is provided a method of manufacturing a cup-shaped composite container body (300) in which an annular protective frame (323) continuous with a columnar protective frame is heat-sealed at a joint between the body and the bottom plate (312) on the inner surface side of the container.

[0004]

However, the container according to the above-mentioned conventional method for producing a composite container does not cause any problem in the use of ordinary contents, but it does not protect the contents such as beverages containing carbonic acid and heat sterilization. When used for required contents, the lid, body, bottom, etc. are extremely deformed due to fluctuations such as increase or decrease in internal pressure in the container, and this deformation may cause damage to the sealing part. This may cause a problem in the hermeticity of the container.

The present invention solves the above-mentioned problems of the conventional composite container, and does not cause extreme deformation of the container due to an increase or decrease of the internal pressure in the container. An object of the present invention is to provide an internal pressure resistant composite container which is easy to operate.

[0006]

Means for Solving the Problems A first invention of the present invention is:
As shown in FIG. 1, a paper container (110) having a paper plate as a main layer and a bottom plate (112) joined to the lower inside of a body (111) made of a laminated material having a thermoplastic resin layer provided at least on the inner surface side of the container. ) Is placed at a predetermined position in the injection mold, a molten thermoplastic resin is injected into the cavity, and an opening peripheral frame (121) is provided at the opening at the upper end of the body of the paper container; Opening of the container body (100) in which a columnar protective frame (122) is provided on the vertical bonding portion of the body on the inner surface side of the container, and an annular protective frame (123) is provided on a joint between the body and the bottom plate. A composite container in which a lid (200) is sealed in a part (130) by a heat-sealing part (101 and 201) and a fitting part (101 and 202), wherein the fitting part (102 and 202) At least one of the heat-fused portions (101 and 201) is in the axial direction of the container body. It is internal pressure resistance composite container (10), characterized in that located on the center side of the vessel.

According to a second aspect of the present invention, as shown in FIGS. 1 and 2 or FIGS. 1 and 3, a top plate (230) of the lid (200) and a bottom plate (230) of the container body (100) are provided. 11
The internal pressure-resistant composite container (10) according to the first invention, wherein reinforcing ribs (231, 124) are provided on the inner surface side of the container (2).

According to a third aspect of the present invention, as shown in FIG. 1 or FIG. 5, the lid (200) can be opened on the top plate (230) or on the bottom plate (112) of the container body (100). The internal pressure-resistant composite container (10) according to the first or second aspect of the present invention, characterized in that the container (10) has a special pouring hole (240, 113).

According to a fourth aspect of the present invention, as shown in FIG. 1 or FIG. 5, a container outer surface side of a top plate (230) of the lid member (200) or a bottom plate (112) of the container body (100). The internal pressure-resistant composite container (10) according to the third invention, characterized in that a sealing film (250, 150) is releasably attached to the container and the pouring hole (240, 140) is sealed. It is.

According to a fifth aspect of the present invention, as shown in FIG. 6, a seal / reinforcement rib (241) for bridging the spout hole (240) of the lid member (200) is provided. An internal pressure-resistant composite container according to a fourth aspect of the present invention.

[0011]

As shown in FIG. 1, the internal pressure-resistant composite container of the present invention comprises a reinforcing frame (120) comprising an opening peripheral frame (121), a columnar protective frame (122) and an annular protective frame (123). Container body (100) thermally fused to the inner surface of paper container (110)
As shown in FIG. 4, the lid material (20)
No. 0) is attached by the heat fusion parts (101 and 201) and the fitting parts (102 and 202) to seal the opening. Then, at least one fitting portion (102 and 20)
2) is provided so as to be located closer to the center of the container in the axial direction of the container body than the heat-fused portions (101 and 201);
When the inner pressure of the container increases and the top plate (230) of the lid material is deformed so as to expand upward, the peripheral wall (220) of the lid material receives a force in a direction of pushing outward and expanding, and the above-mentioned fitting portion (102 and 20) is applied.
2) fits tightly. Therefore, a shearing force is less likely to be generated on the bonding surface of the heat-sealed portions (101 and 201) outside the fitting portion in the axial direction of the container body. As a result, the sealing portion is not damaged, and the sealing property of the container is good.

Further, when the inner pressure of the container is reduced and the top plate of the lid material is deformed so as to expand downward, the fitting portion provided on the lid material receives a downward force, and the fitting portion of the container body is in contact with the fitting portion of the container body. Since the fitting is strengthened and a shearing force is hardly generated on the adhesive surface of the heat-sealed portion, the sealed portion is not damaged, and the sealing performance of the container is good. In addition, since the body is made of a rigid laminated material having a paper layer as a main layer, the body is hardly deformed due to a change in the internal pressure of the container.

Further, the internal pressure-resistant composite container of the present invention, in which reinforcing ribs are provided on the inner surface side of the container on the top plate of the lid member and the bottom plate of the container main body, is capable of reducing the internal pressure of the container due to the rigidity of the reinforcing rib. The top plate of the lid member and the bottom plate of the container body are not easily deformed.

In addition, the top plate of the lid material or the bottom plate of the container body may be
The internal pressure-resistant composite container of the present invention provided with an openable pouring hole is a container that is easy to use because the openable pouring hole is provided when the contents are poured out.

In the internal pressure-resistant composite container provided with a sealing and reinforcing rib for bridging in the form of dividing into an injection hole, the adhesive strength of the sealing film to be sealed is increased. The sealing portion is not damaged, and the container has good sealing performance.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The internal pressure-resistant composite container of the present invention has a paper layer as a main layer and a thermoplastic resin layer such as polyethylene at least on the inner surface side of the container. For example, a polyethylene layer / paper layer / polyethylene layer structure , Polyethylene layer / paper layer /
Polyethylene layer / aluminum foil layer / adhesive layer / polyethylene terephthalate layer / adhesive layer / polyethylene layer structure or polyethylene layer / paper layer / ethylene-acrylic acid copolymer layer / polyethylene terephthalate layer / silicon oxide vapor deposited layer / adhesive layer A paper container joined by heating and bonding the bottom plate under the inside of a body made of a laminated material such as a polyethylene layer structure is placed at a predetermined position in an injection molding die, and polyethylene is placed in a cavity. As shown in FIG. 1, a molten thermoplastic resin such as is injected into the opening (130) at the upper end of the body (111) of the paper container (110) and engages with the heat-sealed portion (101) with the lid material. Or the fitting part (102) by screwing
An opening peripheral frame (121) is provided, and a columnar protective frame (122) is provided on the vertical bonding portion on the inner surface side of the body, and an annular protection is provided on a joint between the body and the bottom plate (112). Frame (1
23), and a fitting part (20) by biting or screwing with a heat-sealed part (201) of the container body (100) provided with the container body.
At least one of the fitting portions has a lid member (200) injection-molded with a thermoplastic resin such as polyethylene, which is located on the center side of the container in the axial direction of the container body from the heat-fused portion. Things. Note that the opening peripheral frame (12
1) and annular protective frame (122) and annular protective frame (123)
Is a continuous reinforcing frame (120), which is thermally fused to the inner surface of the paper container (110) at the same time as molding by insert injection molding. Then, on the filling machine, the lid material is driven into or screwed into the container body filled with the contents, and the container is sealed by heat-sealing the heat-sealed portion by an ultrasonic sealing method or the like. It is.

Further, depending on the use of the container, the lid material (20
As shown in FIG. 2, a reinforcing rib (231) having a lattice shape or an annular shape may be provided on the inner surface side of the top plate (230) of the container (0), and similarly, the bottom plate of the container body (100) (1
As shown in FIG. 3, a reinforcing rib (124) having a lattice shape or an annular shape may be provided on the inner surface side of the container 12). Although the shape of the reinforcing rib is not particularly limited, FIG.
FIG. 8A shows a rib (124) having a rectangular section.
FIG. 8 (b) shows a rib (124) having a convex cross section.
(B) may be an L-shaped rib (124) or the like.

Further, the top plate (230) of the lid material (200)
In addition, as shown in FIGS. 1 and 2,
40) may be provided, and an openable opening (140) may be provided in the bottom plate (112) of the container body (100), as shown in FIG. Normally, as shown in FIG. 1 or FIG. 5, these pouring holes (240, 140) are used to seal a sealing film (250, 150) on the outer surface side of the container in a peelable manner. is there.

As shown in FIG. 6, a sealing / reinforcing rib (241) is formed by dividing the pouring hole (240) so as to reduce the influence of the fluctuation of the internal pressure on the sealing film for sealing the pouring hole. You may build a bridge as you do.

As a method of heat-sealing and fitting the lid member to the container body, for example, the container body (10) shown in FIG.
0) of the heat-sealed portion (10) on the top surface of the opening peripheral frame (121).
1, 201), which are heat-fused in a ring shape, and fitted into one of the fitting portions (102, 202) of the inner peripheral surface of the opening peripheral frame by engaging in a ring shape, FIG. 7 (a). The container body (10
0) of the heat-sealed portion (10) on the top surface of the opening peripheral frame (121).
1,201) in a ring shape, and two upper and lower fitting portions (102a, 202a, and 10) on the inner peripheral surface of the opening peripheral frame.
2b, 202b), which are engaged with each other in a ring shape,
A ring-shaped heat-sealing is performed on the heat-sealed portions (101, 201) on the top surface of the opening peripheral frame of the container body (100) shown in FIG. And two ring-shaped fitting portions (102a, 202a and 102a).
b, 202b), which is fitted in a ring shape on the heat-sealed portion (101, 201) on the top surface of the opening peripheral frame (121) of the container body (100) shown in FIG. 7 (c). Fused
The fitting frame body (260) fitted to the lid member (200) is engaged with one of the fitting portions (102, 202) of the inner peripheral surface of the opening peripheral frame in a ring shape. Good, but not limited to these.

<Example> First, a polyethylene layer (20 μm) was used.
m) / Ink layer (text and pattern) / paper layer (320 g / m ² )
/ Polyethylene layer (20 μm) / polyethylene layer (15
μm) / polyethylene terephthalate layer (12 μm) /
Silicon oxide deposited film (500 °) / polyethylene layer (60
μm) A body member obtained by punching a laminated material having a configuration is wound into a cylinder to form a body, and an upper end of the body forms an opening, and a polyethylene layer (20 μm) / paper layer (245 g / m ² ) below.
/ Polyethylene layer (20 μm) / polyethylene layer (15
μm) / polyethylene terephthalate layer (12 μm) /
Silicon oxide deposited film (500 °) / polyethylene layer (60
μm) A circular bottom plate material obtained by stamping a laminated material having a configuration is combined, and the lower periphery of the body and the periphery of the bottom plate are tightened in a heated state to integrate the body and the bottom plate to produce a paper container. .

Next, the above-described paper container is placed at a predetermined position in an injection molding die, and molten polyethylene is injected into the cavity. As shown in FIG. An opening peripheral frame (121) having a fitting portion (102) with a groove-ring-shaped lid member on the inner peripheral surface is provided in an opening (130) at the upper end of the trunk (111). A columnar protective frame (122) is provided on the bonding portion, an annular protective frame (123) is provided on a joint between the body and the bottom plate (112), and a bottom plate (11) is provided.
On the inner surface side of the container 2), the reinforcing ribs (12
4) was heat-sealed at the same time as molding to produce a container body (100) of this example. Separately, an aluminum foil layer (50 μm) / polyethylene terephthalate (12
μm) / laminated film (45 μm) (polyethylene layer /
A sealing film (250) shown in FIG. 1 having a polyvinylidene chloride layer / polyethylene layer) configuration is placed at a predetermined position in an injection molding die, and molten polyethylene is injected into a cavity, as shown in FIG. As described above, a peripheral wall (22) having a fitting portion (202) with a convex ring-shaped container body on the inner periphery of a flange (210) whose lower surface is a heat-fused portion (201) with the container body.
0), and a spout hole (240) for bridging a sealing and reinforcing rib (241) shown in FIG. 6 on the inner periphery below this peripheral wall and a grid-like reinforcing rib (24) on the inner surface side of the container shown in FIG. 231), and a top plate (230) to which a sealing film (250) is thermally fused is connected to the outer surface of the container shown in FIG.
00).

Next, the carbonated beverage is filled into the container body by a filling machine, and as shown in FIG. 4, the lid material (200) is driven into the opening of the container body (100) to drive the container body. The fitting portion (202) of the lid material is fitted into the fitting portion (102), and the flange (21) of the lid material is further formed by ultrasonic sealing.
0) The heat-sealed portion (201) on the lower surface is heat-sealed to the heat-sealed portion (101) on the upper surface of the opening peripheral frame (220) of the container body, and the internal pressure-resistant composite container (10) of the present embodiment. Was sealed.
In addition, the fitting part (102, 202) of this container was located on the center side of the container in the container main body axial direction from the heat fusion part (101, 201).

When the internal pressure-resistant composite container of the present embodiment was subjected to a normal distribution and storage period, and the appearance of the container was observed, no significant deformation of the container was observed so as to impair the external appearance. No liquid leakage was observed. Then, the sealing film on the top plate of the lid material was easily peeled off, and the container was easily opened.

[0025]

The internal pressure-resistant composite container of the present invention withstands an increase or decrease in the internal pressure of the container even when used for contents such as beverages containing carbonic acid and contents requiring heat sterilization. There is no significant deformation of the container so as to impair the sealing property, the sealing portion is not damaged by the deformation, and the sealing performance is extremely good.

[0026] If necessary, an openable pouring hole can be provided in the top plate of the lid material or the bottom plate of the container body.
It is a container that is easy to use when pouring out the contents.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lid member and a container body of an internal pressure resistant composite container according to an embodiment of the present invention.

FIG. 2 is a bottom view of a lid member of the internal pressure resistant composite container according to one embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA ′ of the internal pressure-resistant composite container of the present invention in FIG. 1;

FIG. 4 is an explanatory view showing a fitted state when a lid member is attached to an opening of a container body of the internal pressure resistant composite container of the present invention in FIG. 1;

FIG. 5 is a partial cross-sectional view of an internal pressure-resistant composite container according to another embodiment of the present invention in which an outlet hole is provided in a bottom plate of the container body.

FIG. 6 is an explanatory view showing a state in which a sealing and reinforcing rib is provided in a pouring hole of a lid material of an internal pressure resistant composite container according to another embodiment of the present invention.

FIGS. 7 (a), (b) and (c) are explanatory views each showing a fitted state of a container body and a lid member of an internal pressure resistant composite container according to another embodiment of the present invention.

FIGS. 8 (a), (b) and (c) show the shapes of reinforcing ribs provided on the inner side of the bottom plate of the container body of the internal pressure resistant composite container according to another embodiment of the present invention. FIG.

FIG. 9 is a cross-sectional view of a conventional composite container.

[Explanation of symbols]

 10 Composite container 100, 300 Container main body 101, 201 Thermal fusion bonding part 102, 202 Fitting part 110, 310 Paper container 111, 311 Body 112, 312 Bottom plate 120 ... Reinforcement frame bodies 121, 312... Opening peripheral frames 122, 322... Column-shaped protection frames 123, 323. Holes 150, 250 Sealing film 200 Lid 210 Flange 220 Peripheral wall 230 Top plate 231, 232 Fitting ring 241 Sealing / reinforcing rib 250 Sealing film 260 … Mating frame

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code FI B29L 22:00 (72) Inventor Katsuyuki Ohno 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd.

Claims (5)

[Claims] 1. A paper container comprising a paper layer as a main layer and a bottom plate joined to the inside lower part of a body made of a laminated material having a thermoplastic resin layer provided at least on the inner surface side of the container. The molten thermoplastic resin is injected into the cavity, an opening peripheral frame is provided at the opening at the upper end of the body of the paper container, and the body is placed on the vertical bonding portion on the inner surface side of the container. A composite container in which a columnar protective frame is provided, and a lid material is sealed by a heat-sealing portion and a fitting portion in an opening of the container body in which an annular protective frame is provided on a joint between the body and the bottom plate. The internal pressure-resistant composite container, wherein at least one of the fitting portions is located closer to the center of the container in the axial direction of the container than the heat-sealed portion. 2. The internal pressure-resistant composite container according to claim 1, wherein reinforcing ribs are provided on the container inner surface side of the top plate of the lid member and the bottom plate of the container main body. 3. The internal pressure resistant composite container according to claim 1, wherein an openable pouring hole is provided in the top plate of the lid member or the bottom plate of the container body. 4. The spout hole is sealed by releasably attaching a sealing film to the top surface of the lid member or the outer surface of the container on the bottom plate of the container body. Internal pressure resistant composite container. 5. The internal pressure-resistant composite container according to claim 4, further comprising a sealing and reinforcing rib for bridging the outlet of the lid material in a divided manner.