JP2011001116A - Paper container with synthetic resin-made ring, and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container with a synthetic resin-made ring in which a work is easy to be performed when the synthetic resin-made ring is jointed on a container body, and there exists no generation of pinholes in a synthetic resin layer of a laminated part where both ends of the laminated material forming the barrel part of the container are overlapped when they are jointed, and which has a stable quality, and to provide a method for manufacturing the same.SOLUTION: In the paper container with the synthetic resin-made ring having the container body consisting of the laminated material in which a paper layer is the main material and the innermost layer is a synthetic resin layer and having the laminated part in which both side end parts of the laminated material are overlapped, and in which the synthetic resin-made ring having the inner peripheral wall and the flange part extending outward from the inner peripheral wall is welded and jointed on the opening part of the container body by ultrasonic welding, the upper part of the laminated part of the container body is made to be a butt part in which both end parts of the laminated material are butted.

Description

The present invention relates to a synthetic resin ring-attached paper container in which a synthetic resin ring is joined to the opening of a container body having an opening made of a laminated material mainly including a paper layer, and a method for manufacturing the same.

Conventionally, a paper container having an opening made of a laminated material mainly composed of a paper layer has been widely used for alcoholic beverages, fruit juices, etc. due to its characteristics such as light weight and easy disposal. In some cases, the lid is easily crushed and it is difficult to fix the lid with a stable and constant strength.
For this reason, in order to give strength to a paper container having an opening, a synthetic resin ring-attached paper container in which a synthetic resin ring is welded to the opening has been proposed (see Patent Document 1).

As shown in FIG. 4, this synthetic resin ring-attached paper container is generally a laminated portion (115) in which a paper layer is the main component and the innermost layer is made of a laminated material of a synthetic resin layer, and both end portions of the laminated material are overlapped. ) Of a paper container body (100) having a body part (110) having an opening (130) in the upper part, and a flange part (220) on the upper end outer periphery of the peripheral wall (210) on the upper inner surface of the body part. The resin ring (200) is formed by joining the peripheral wall (210) joining surfaces.

And this container (10) with a ring made of synthetic resin is used as a cover material (300) for sealing after filling the contents, as shown in FIG. ) And heat sealed so as to be peeled off, or the cap was screwed or engaged with a synthetic resin ring for sealing.

Japanese Examined Patent Publication No. 63-24464

However, the above-described conventional container with a synthetic resin ring includes an annular fusion projection having a horizontal triangular shape and a linear fusion surface provided on the outer periphery of the inclined peripheral wall of the synthetic resin ring, and a container body. The inner surface of the slanted opening of the body is fused and joined with ultrasonic vibration energy from the horn, and the horn pressure is set appropriately by the variation in the dimensions of the container and the variation in the dimensions of the reinforcing ring. In addition, when joining, there was a pinhole in the synthetic resin layer of the joint where the both ends of the laminated material that forms the body of the container overlap, causing a liquid leakage accident during distribution storage, etc. .

The present invention solves the above-mentioned conventional problems, and the work when joining the synthetic resin ring to the container body is easy, and when joining, both ends of the laminated material forming the body part of the container are The present invention provides a synthetic resin ring-attached paper container having no pinholes in the synthetic resin layer of the overlapping bonded portion and having a stable quality, and a method for producing the same.

That is, according to the first aspect of the present invention, there is provided a container body having a laminated portion in which a paper layer is a main component and an innermost layer is made of a synthetic resin layer, and the both end portions of the laminated material are overlapped, and the container body. In the paper container with an opening reinforcing ring, which is formed by ultrasonic welding a synthetic resin opening reinforcing ring having a peripheral wall and a flange portion extending outwardly from the peripheral wall, the upper part of the bonding portion of the container main body is A synthetic resin ring-attached paper container comprising a butted portion where both end portions of the laminated material are butted.

Next, the second invention of the present invention is the synthetic resin ring-attached paper container, wherein the butting portion has a lower end positioned above a lower end of the peripheral wall of the synthetic resin ring.

Next, a third invention of the present invention is the synthetic resin ring-attached paper container, wherein the synthetic resin ring has an annular fusion projection on the inner surface of the peripheral wall.

Next, a fifth invention of the present invention is the synthetic resin ring-attached paper container, wherein the container body has a vertically long shape having a flat opening.

Next, a sixth invention of the present invention is the above-mentioned butt, in which a paper layer is the main component and the innermost layer is made of a laminated material of a synthetic resin layer, and the upper part is made of a butt portion in which both end portions of the laminated material are abutted. A synthetic resin ring having a peripheral wall and a flange extending outward from the peripheral wall at the opening of the container main body having a bonding portion formed by overlapping portions on both side ends of the laminated material. Is inserted by inserting the peripheral wall below the flange, and vibration energy is applied while pressing the inner peripheral wall surface of the synthetic resin ring with a horn, and the annular fusion projection of the synthetic resin ring and the inner surface of the container main body are A synthetic resin ring-attached paper container manufacturing method characterized in that a joining surface is melted and an inner surface of a peripheral wall of the synthetic resin ring is joined to an upper inner surface of the container body.

The synthetic resin ring-attached paper container of the present invention has a laminated portion of a bonding portion of a container body that joins the outer surface of the peripheral wall of the synthetic resin ring to the inner surface of the upper opening of the container body with an ultrasonic welding machine. Since there is no overlapped step, the synthetic resin ring bonding operation is easy, and pinholes due to ultrasonic welding are not generated in the body bonding portion of the container body.

It is explanatory drawing which shows one Embodiment of the paper container with a synthetic resin ring of this invention. It is explanatory drawing which shows other embodiment of the paper container with a synthetic resin ring of this invention. It is explanatory drawing which shows one Embodiment of the manufacturing method of the paper container with a synthetic resin ring of this invention. It is explanatory drawing which shows the manufacturing method of the conventional paper container with a ring made from a synthetic resin.

As shown in FIG. 1, the synthetic resin ring-attached paper container (10) of the present invention comprises a paper layer as a main component, the innermost layer is made of a synthetic resin layer, and the upper part protrudes from both ends of the laminated material. The butt portion (116) is provided with a bonding portion (115) formed of an overlapping portion (117) in which both end portions of the laminated material are overlapped, and an opening ( 130) of a synthetic resin ring (200) having a flange portion (220) on the outer periphery of the upper end of the peripheral wall (210) on the upper inner surface of the body portion of the paper container body (100) having the barrel portion (110) having 130). The peripheral wall (210) joint surface is joined.
Then, after filling the contents, as a lid material (300) for sealing, the sealing sheet is heat-sealed to the upper surface of the synthetic resin ring (200) in accordance with the purpose of use. Or the cap is screwed or occluded into the synthetic resin ring for sealing.

Next, an embodiment of the synthetic resin ring-attached paper container of the present invention will be described in detail.
As shown in FIG. 1, the container body (100) is mainly made of a laminated material having a paper layer as a main component and a synthetic resin layer such as polyethylene as an outermost layer and an innermost layer, and a fan-shaped body member is wound into a cylindrical shape. The upper part is composed of an abutting part (116) in which both end parts of the laminated material are abutted, and below the abutting part (116) is an overlapping part (117) in which both end parts of the laminated material are overlapped. ) Having a laminating portion (115) made of a), and the trunk portion has an opening (130) on the upper side, and a lower part is a circular bottom member below the trunk portion. The combination is a paper container having a cup shape in which the lower peripheral edge of the body part and the peripheral part of the bottom part (120) are integrated with the body part and the bottom part in a heated state.
Here, the opening (130) may have a configuration in which an upper end is wound outward to form an annular winding portion.

In addition, as shown in FIG. 2, the container body is not configured to be sealed by providing the cup-shaped bottom member, but is configured to be sealed by providing a seal portion (190) below the trunk without providing the bottom member. It is good.
In the case of a paper container having a vertically long shape having a flat opening as shown in FIG. 2, a synthetic resin having a flange portion (220) on the upper end outer periphery of the peripheral wall (210) on the upper inner surface of the barrel portion. When joining the joint surface of the ring (200) to the peripheral wall (210), the upper part is composed of a butted part (116) in which both end parts of the laminated material are butted, and below the butted part (116), It is preferable to make it the bonding part (115) which consists of the overlapping part (117) which piled up the both ends of the said laminated material.
Here, the flat opening refers to a shape having a major axis and a minor axis, such as an ellipse or an ellipse, rather than a circle.

Further, as shown in FIG. 3, the synthetic resin ring (200) is provided with a flange (220) on the outer periphery of the upper end of the peripheral wall (210), and an annular fusion projection (221) is formed on the outer surface of the peripheral wall (210). It is provided. Further, the vertical cross-sectional shape of the annular fusion projection (221) may normally be any of a rectangle, a triangle, and a trapezoid.
This synthetic resin ring (200) is usually produced by injection molding using a thermoplastic resin such as high-density polyethylene having rigidity.

And the method of joining a synthetic resin ring to the container main body which has the bonding part (115) which piled up the both ends of the laminated material, as shown in FIG. 3, attaches the container main body (100) to the anvil (30) ( The outer surface of the opening at the upper end is fixed from the outside, the opening (130) at the upper end inside the trunk (110) of the container body (100), and the flange at the outer periphery at the upper end of the peripheral wall (210) The synthetic resin ring (200) having (220) is inserted by inserting the peripheral wall (210) below the flange portion (220).
Next, vibration energy is applied while pressing the peripheral wall (210) of the synthetic resin ring ring with the horn (20), and the joint surface between the annular fusion projection (221) of the synthetic resin ring and the inner surface of the opening of the container body. And the outer surface of the peripheral wall (210) of the synthetic resin ring is joined to the inner surface of the body portion of the container body.

The synthetic resin ring-attached paper container of the present invention described above has an inclination of the peripheral wall of the synthetic resin ring on the inclined inner surface of the opening of the trunk of the container body, as in the case of a conventional synthetic resin ring-attached paper container. Since there is no step where the laminated material is laminated, the bonding part of the container body that joins the outer periphery with an ultrasonic welding machine has no liquid leakage due to the occurrence of pinholes in the body bonding part (115) , The quality is stable.

Further, the abutting portion is provided so that the lower end is located above the lower end of the peripheral wall of the synthetic resin ring, so that the laminating portion of the container body to be joined by the ultrasonic welding machine overlaps the laminated material. Since there is no combined step, there is no liquid leakage due to the occurrence of pinholes in the body bonding portion (115), and the quality is stabilized.

  In addition, the laminated material used for the container main body is a paper layer mainly composed of a synthetic resin layer, and a synthetic resin layer, a metal foil layer, and a vapor deposition layer on the other layers according to the purpose of use of the container. Or a laminated material provided.

Example 1
First, by the laminating method, [outside of container] polyethylene layer (20 μm) / printing layer / paper layer (300 g / m 2) / adhesive layer / aluminum foil layer (9 μm) / polyethylene terephthalate layer (12 μm) / adhesive layer / A laminated material having a polyethylene layer (60 μm) [inner side] structure was prepared, a butt having a length of 15 mm was provided on the upper part thereof, and a cup-shaped container body having a bonding part serving as an overlapping part was prepared below.
Next, the synthetic resin ring which provided the flange part in the outer periphery of the upper end of the surrounding wall whose length is 20 mm was produced by the injection molding method using the high density polyethylene (Mitsui Chemicals 2100K).
In addition, a laminated material of [upper] polyethylene terephthalate layer (12 μm) / adhesive layer / aluminum foil (9 μm) / adhesive layer / polyethylene layer (20 μm) / polyethylene adhesive resin (40 μm) [lower] is prepared. And the sheet | seat for sealing was produced using this laminated material.

Next, the above-mentioned paper container main body is inserted into the anvil, the annular winding part at the upper end of the trunk part is fixed from the lower side, and the synthetic resin ring is attached to the opening inside the upper end of the trunk part. Insert the peripheral wall below the flange, insert it, and use the orbital welder (BRANSON 107) to give vibration energy while pressing the peripheral wall surface of the synthetic resin ring with the horn (20). The outer surface of the peripheral wall of the synthetic resin ring was joined to the inner surface of the part to produce a paper container with a synthetic resin ring.

Then, the penetrating liquid is poured into the above-mentioned synthetic resin ring-attached paper container, and the sealing sheet is heat-sealed by the heat sealing method on the upper surface of the synthetic resin ring, and the container is sealed for 1 hour. After standing still upside down, the presence or absence of leakage of the penetrating liquid was examined. The penetrating liquid leaked at the joint between the synthetic resin ring and the container main body and the pinhole at the body bonding portion of the container main body. It was confirmed that there was no liquid leakage.

(Comparative Example 1)
A synthetic resin-made cup-shaped container with a ring was produced in the same manner as in Example 1 except that the pasting part was an overlapping part where all ends overlapped.
And, as in Example 1, after standing upside down for 1 hour, there is no leakage of penetrant liquid related to the joint between the synthetic resin ring and the container body, but there is a pinhole in the body bonding part of the container body The resulting liquid leakage was confirmed.

DESCRIPTION OF SYMBOLS 10 ... Synthetic resin ring-attached paper container 20 ... Horn 30 ... Anvil 100 ... Container body 110 ... Body 111 ... Annular winding part 115 ... Laminating part 116 ... Butting part 117 ... Overlapping part 120 ... Bottom part 130 ... Opening part 180 ... Clearance 190 ... Seal part 200 ... Synthetic resin ring 210 ... Peripheral wall 221 ... Annular fusion projection 220 ... Flange part 300 ... Lid

Claims (5)

A container body having a paper layer as a main component and a laminated material of a synthetic resin layer as an innermost layer, and a laminated portion in which both end portions of the laminated material are overlapped, and an inner peripheral wall and an inner peripheral wall at an opening of the container main body In a paper container with an opening reinforcement ring in which a synthetic resin opening reinforcement ring having a flange part extending outward from the ultrasonic welding is joined, both ends of the laminated material are abutted against the upper part of the bonding part of the container body A paper container with a ring made of a synthetic resin, characterized by comprising a butted portion. 2. The synthetic resin ring-attached paper container according to claim 1, wherein a lower end of the abutting portion is located above a lower end of a peripheral wall of the synthetic resin ring. The synthetic resin ring-attached paper container according to claim 1 or 2, wherein the synthetic resin ring has an annular fusion projection on an inner surface of the peripheral wall. The synthetic resin ring-attached paper container according to any one of claims 1 to 3, wherein the container body has a vertically long shape having a flat opening. Next, a sixth invention of the present invention is a butt portion in which the paper layer is a main component and the innermost layer is made of a laminated material of a synthetic resin layer, and the upper portion is made of a butt portion where both end portions of the laminated material are abutted. Is a synthetic resin ring having a peripheral wall and a flange portion extending outward from the peripheral wall at the opening of the container body having a bonding portion formed by overlapping portions on both side ends of the laminated material. Inserting the peripheral wall below the flange and inserting it, applying vibration energy while pressing the inner peripheral wall surface of the synthetic resin ring with a horn, and joining the annular fusion projection of the synthetic resin ring and the inner surface of the container body A method for producing a paper container with a synthetic resin ring, wherein the surface is melted and the inner surface of the peripheral wall of the synthetic resin ring is joined to the upper inner surface of the container body.

Images