JP2011001115A - Paper-made sealed container with synthetic resin 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 having no generation of pinholes in a synthetic resin layer of a joint where both ends of a laminated material forming a barrel part of a container body are overlapped when the synthetic resin-made ring is jointed on an opening part of the container body, and having a stable quality.SOLUTION: In the paper-made sealed container with the synthetic resin-made ring having the container body consisting of a laminated material in which a paper layer is a main material and the innermost layer is a synthetic resin layer, and having a laminated part overlapping both side end parts of the laminated material, and prepared by jointing the synthetic resin ring having an inner peripheral wall and a flange part extending outward from the inner peripheral wall on the opening part of the container body by ultrasonic welding, the laminated part forms a covering part in which the end edge being inside when the container body is formed covers the end face of the paper layer of the laminated material with a resin part extending from the side end edge of the paper layer with the resin part.

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. 6, this synthetic resin ring-attached paper container is generally a laminated portion (115) in which a paper layer is the main component, the innermost layer is made of a synthetic 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 with synthetic resin ring (10) is used as a lid | cover material (300) for sealing after filling with 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.

  In addition, as shown in FIG. 7, the bonding portion (500) of the trunk portion of the container body has a paper layer (502) that constitutes the trunk portion so that the paper container does not leak even when filled and sealed with liquid. ) And the innermost layer of the laminated material in which the synthetic resin layer (501) is provided, the edge (510) on the inner side of the container body has the paper layer (502) removed in the thickness direction, and about half By forming a folded portion (505) having a thickness and forming an end edge portion where the folded portion (505) is folded to overlap the paper layer, liquid leaks from the bonding portion (500) of the container body. It was done to prevent.

Japanese Examined Patent Publication No. 63-24464

However, the folded-back part is formed by removing the paper layer in the thickness direction from the inner edge of the container body described above, forming a folded part having a thickness of about half, and folding the folded part so that the paper layer overlaps. When the synthetic resin ring is fused and joined to the opening of the container body having the bonding portion (500) using the laminated material provided with (505) by ultrasonic vibration energy, the bonding portion ( 500), a pinhole was generated, and a liquid leakage accident occurred during distribution storage.

The present invention solves the above-mentioned conventional problems, and the work when the synthetic resin ring is fused and joined to the paper container body with ultrasonic vibration energy is easy, and a pinhole is formed at the joint. The present invention provides a paper sealed container with a synthetic resin ring with a stable quality that does not occur and a method for manufacturing the same.

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 cup-shaped container with a synthetic resin ring and a method for producing the same, which does not generate pinholes in the overlapping synthetic resin layers and has a stable quality.

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. A synthetic resin ring-attached paper sealed container with a synthetic resin ring having an inner peripheral wall and a flange portion extending outwardly from the inner peripheral wall at the opening of the synthetic resin ring. Made of synthetic resin, wherein the inner edge is formed of a laminated material having a resin part extending from the side edge of the paper layer, and the resin part covers the paper layer end face. It is a paper sealed container with a ring.

Next, a second invention of the present invention is characterized in that the bonded portion has a covering portion in which the resin portion is folded back to the outer surface side of the edge that becomes the inner side when the container body is formed. It is a paper sealed container with a ring.

Next, a third invention of the present invention is the synthetic resin ring, wherein the bonding portion has a covering portion in which the resin portion is joined to an inner surface of an edge which becomes an outer side when the container body is formed. It is a sealed container made of paper.

Next, the fourth invention of the present invention is characterized in that the synthetic resin ring is welded and fixed in a state where a gap is provided between the flange portion and the upper end of the opening of the container body. This is a paper sealed container with a synthetic resin ring.

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 aspect of the present invention is that a paper layer is mainly used and the innermost layer is made of a synthetic resin layer laminated material, and an inner edge of the laminated material when the container body is formed is a side edge of the paper layer. Forming a resin body extending from the edge, forming a container body having a bonded portion in which a paper layer end surface is covered with the resin part, and forming a peripheral wall and a flange extending outward from the peripheral wall at the opening of the container body The synthetic resin ring having a portion is inserted into the opening inside the upper end of the body portion of the container body, and the synthetic resin ring is inserted between the lower surface of the flange portion and the upper end of the opening. Applying ultrasonic vibration energy while pressing the peripheral wall surface of the synthetic resin ring with a horn, melting the bonding surface between the annular fusion projection of the synthetic resin ring and the inner surface of the container body, and joining Made of synthetic resin ring paper container characterized by It is a method.

The synthetic resin ring-attached paper container of the present invention is such that the laminating portion of the container body has an inner edge when forming the container body of the laminated material, the paper layer does not fold, and extends from the side edge of the paper layer. The outer surface of the peripheral wall of the synthetic resin ring is joined to the inner surface of the upper opening with an ultrasonic welding machine. Therefore, joining work is easy, and pinholes due to ultrasonic welding are not generated in the body portion 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 one Embodiment of the bonding part of a container main body. It is explanatory drawing which shows other embodiment of the bonding part of a container main body. 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 the manufacturing method of the paper container with a synthetic resin ring of this invention. It is explanatory drawing which shows the general form of a synthetic resin ring-attached paper container. It is explanatory drawing which shows the bonding part of the conventional container main body.

As shown in FIG. 1, the synthetic resin ring-attached paper container (10) of the present invention is a laminate in which a paper layer is mainly used 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. A mating portion (115) is formed on the upper inner surface of the body portion of the paper container body (100) having the body portion (110) having an opening portion (130) on the upper portion, and on the upper end outer periphery of the peripheral wall (210). ) Of the synthetic resin ring (200) with the peripheral wall (210) joint surface joined. At this time, it is good also as a structure joined in the state which provided the clearance gap (180) so that the said flange part (220) lower surface may not contact the upper end of an opening part (130).
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. A body part (110) having a laminating part (115) in which both end parts are overlapped, and this body part has an opening (130) on the upper side, and the upper end is wound outward to form an annular winding part. (111) is formed, a circular bottom member is combined below the trunk, and the lower periphery of the trunk and the periphery of the bottom (120) are heated to form a cup shape in which the trunk and the bottom are integrated. It is a paper container.
Here, it is good also as a structure which wound the upper end of the said opening part (130) outside, and formed the cyclic | annular winding part.

As shown in FIG. 2 (a), the laminating portion (115) extends the synthetic resin layer (114) at the inner edge when forming the container body of the laminated material from the side edge of the paper layer (118). As shown in FIG. 2 (b), the resin portion (116) to be taken out is formed, and the resin portion (116) is folded back to the paper layer side to form a covering portion (117) covering the end surface, which is the outside. It is integrated with the edge.
Further, as shown in FIG. 3, the covering portion (117) may be formed by integrating the resin portion (116) on the inner surface of the outer edge.

In addition, as shown in FIG. 4, 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.
And in the case of the paper container which consists of a vertically long container main body which has a flat-shaped opening part shown in FIG. 4, it has a flange part (220) in the upper-end outer periphery of the said trunk | drum on the upper end outer periphery of a surrounding wall (210). When joining the peripheral wall (210) joint surface of the synthetic resin ring (200), the bottom surface of the flange portion (220) is joined with a gap (180) provided so as not to contact the upper end of the opening. Is preferred.
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. 5, 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 (211). 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. 5, 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 into the peripheral wall (210) below the flange portion (220), and a gap is formed between the lower surface of the flange portion (220) and the upper end of the opening. (30) is provided and inserted.
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 portion of the container body, as in the case of a conventional synthetic resin ring-attached paper container. The outer periphery of the flange portion (220) is not joined in a state where the lower surface of the flange portion (220) and the upper end of the opening portion are in close contact with each other, and a gap (between the lower surface of the flange portion (220) and the upper end of the opening portion ( 180) is provided for insertion and bonding, and even when firmly fused, 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 container] configuration was prepared, and a resin layer in which the polyethylene layer of the inner layer of the laminated material extended 5 mm from the side edge edge was joined to the outer polyethylene layer of the laminated material. A blank plate provided with a coating layer was produced.
A cup-shaped container body having an annular winding portion on the outer periphery of the upper end of the body portion was manufactured using the blank plate by a cup molding machine manufactured by PMC.
Next, the synthetic resin ring which provided the flange part in the upper end outer periphery of the surrounding wall was produced by the injection molding method using the high density polyethylene (Mitsui Chemicals 2100K).
On the lower surface of the flange of the reinforcing ring, an annular fusion projection having a rectangular cross section with a width of 2.0 mm and a height of 1.0 mm is provided along the outer peripheral surface of the peripheral wall substantially in the middle of the flange. It was.
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 part, and the lower surface of the flange part is inserted with no gap from the upper end of the opening of the container body, and the peripheral wall surface of the reinforcing ring is horned using an orbital welder (BRANSON 107). Vibrating energy was applied while pressing in (20), and the outer surface of the peripheral wall of the reinforcing ring was joined to the inner surface of the upper opening of the container body to produce a synthetic resin ring-attached paper container.

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.

(Example 2)
When the synthetic resin ring was inserted into the opening of the container body, the flange lower surface of the synthetic resin ring was inserted with a gap of 0.5 mm from the upper end of the opening of the container body. A paper container with a synthetic resin ring was prepared in the same manner as in Example 1.
And like Example 1, after standing still for 1 hour, it leaks from the penetrant liquid concerning the junction part of a synthetic resin ring and a container main body, and it originates in a pinhole in the trunk | drum bonding part of a container main body. It was confirmed that there was no liquid leakage.

(Comparative Example 1)
In Example 1, as shown in the figure, the structure of the joint portion of the container body was removed except that about 1/2 of the paper layer was removed in the thickness direction, and a blank plate formed with a folded portion was used. In the same manner as in Example 1, a paper sealed container with a synthetic resin ring was manufactured.
Then, the penetrant was injected in the same manner as in Example 1, and it was examined whether there was leak of penetrant liquid related to the joint portion and occurrence of pinholes in the joint portion. confirmed.

DESCRIPTION OF SYMBOLS 10 ... Paper container 20 with a synthetic resin ring ... Horn 30 ... Anvil 100 ... Container body 110 ... Body 111 ... Annular winding part 115 ... Bonding part 116 ... Resin part 117 ... Cover Part 120 …… Bottom part 130 …… Opening part 180 …… Gap 190 …… Seal part 200 …… Synthetic resin ring 210 …… Surrounding wall 221 …… Annular fusion projection 220 …… Flange part 300 …… Cover material

Claims (6)

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 A synthetic resin ring-attached paper sealed container with a synthetic resin ring having a flange portion extending outward from the ultrasonic welding, and the bonding portion has an inner edge of the paper layer when the container body is formed A paper sealed container with a ring made of a synthetic resin, wherein a covering portion of a laminated material having a resin portion extending from a side edge and covering a paper layer end surface with the resin portion is formed. The said bonding part has the coating | coated part which turned up the said resin part to the outer surface side of the edge used as the inner side at the time of container main body formation, Sealing with paper with a synthetic resin ring of Claim 1 characterized by the above-mentioned. container. The said bonding part has a coating | coated part which joined the said resin part to the inner surface of the edge used as the outer side at the time of container main body formation, The synthetic resin ring sealed paper container with a ring of Claim 1 characterized by the above-mentioned. . The synthetic resin ring according to any one of claims 1 to 3, wherein the synthetic resin ring is welded and fixed in a state where a gap is provided between the flange portion and an upper end of the opening of the container body. Paper sealed container with resin ring. The synthetic resin ring-attached paper container according to any one of claims 1 to 4, wherein the container body has a vertically long shape having a flat opening. The innermost layer is made of a synthetic resin layer with a paper layer as a main component, and the inner edge of the laminated material when forming the container body forms a resin portion extending from the side edge of the paper layer, Forming a container body having a bonded portion in which a paper layer end surface is covered with a resin portion, and forming a synthetic resin ring having a peripheral wall and a flange portion extending outwardly from the peripheral wall at an opening of the container main body; The synthetic resin ring is inserted into the opening on the inside of the upper end of the body portion with a gap between the lower surface of the flange portion and the upper end of the opening, and is inserted into the opening. A synthetic resin ring paper characterized by applying ultrasonic vibration energy while pressing the peripheral wall surface with a horn to melt and join the joint surface between the annular fusion projection of the synthetic resin ring and the inner surface of the container body. Container manufacturing method.

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