JPH0476861B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper tube container for containing drinks such as alcoholic beverages.

[Prior Art] Paper tube containers equipped with heating means for warming or heating drinks such as alcoholic beverages stored therein are known.

This paper tube container equipped with a heating device is formed by attaching a thin plastic interior film to the inner peripheral surface of a cylindrical main body formed of a plurality of spirally wound cardboard layers. In addition, the heating means is quicklime,
It is made up of a metal can that contains this quicklime and water, which is sealed in a separate container so that it does not mix.
This metal can is inserted into the inside of the paper tube from the lower end, and is tightly wound and fixed to the lower end of the paper tube container together with a metal bottom cover having an air vent hole closed with paper. The upper part of the paper tube container is sealed by wrapping a metal lid forming a so-called pull-top drinking spout in the same way as the lower part.

To warm up the drink inside, a pin is inserted through the air vent hole in the bottom lid to pierce the water container inside the metal can and mix the water and quicklime.

[Problems to be Solved by the Invention] According to this conventional paper tube container, the upper end as well as the lower end are sealed with a metal lid by rolling the lid, so it is impossible to sterilize it under high temperature and high pressure after pouring the drink. death,
If the pressure is reduced after this, the paper tube container will easily deform.
Contents may leak.

The present invention has been made in view of the above problems, and provides a paper tube container which is prevented from deformation and whose contents do not leak even when it is cooled and depressurized after sterilization at high temperature and high pressure. The purpose is to

[Means for Solving the Problems] The paper tube container of the present invention comprises a paper tube having a cylindrical main body formed of one or more cardboard layers and a plastic inner film affixed to the inner peripheral surface thereof; A metal lid that seals the lower end of the paper tube, a plastic ring welded to the inner peripheral surface of the upper end of the paper tube, and a flexible lid member made of a thin film material that is pasted on top of this ring. The ring includes an upper flange portion to which the lid member is attached, a cylindrical welded portion extending from the flange portion and decreasing in diameter toward the tip, and a cylindrical welded portion that extends over the entire outer circumference of the welded portion. The upper end of the paper tube has an outer surface that forms a frictional force against the protrusion over the entire circumference when the ring is ultrasonically vibrated along the axial direction. It is characterized by having a tapered ring mounting part whose diameter increases in the opposite direction.

[Function] According to the paper tube container of the present invention, the upper part of the paper tube is sealed with a flexible lid made of a thin film material through a plastic ring welded to the inner inner film, so that after sterilization at high temperature and high pressure, When the paper tube container is sealed with a flexible lid member and cooled, the flexible lid member bends inward following the internal pressure. The paper tube container does not deform due to a drop in internal pressure. In addition, the tapered ring attachment part where the upper end of the paper tube expands outward,
When the ring is ultrasonically vibrated along this axial direction, a frictional force is generated around the entire circumference of the ring's protrusions, and the heat generated by this frictional force causes the ring's protrusions and the inner film of the paper tube to are melted and welded together. As a result, the cylindrical portion of the ring and the inner surface of the paper tube are welded liquid-tightly over the entire circumference, thereby preventing leakage of the contents.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[Example] FIG. 1 shows a cross section of a paper tube container according to an embodiment of the present invention, and FIG. 2 shows the paper tube container of FIG. 1 in an exploded state.

The paper tube container 10 in this embodiment is a sake container with a warming function.

This paper tube container 10 has a metal can 3 disposed within a container body 1, and quicklime 4 and a water container 5 are housed in the metal can 3 as heating means. The quicklime 4 and water container 5 are sealed in a metal can 3 with a metal bottom lid 7 via a buffer cardboard 6, and the metal can 3 and bottom lid 7 are secured to the lower end of the container body 1 by tightening. It is fixed. This metal bottom cover 7 is provided with an air vent hole 7a for releasing steam and the like when water and quicklime react, and this hole 7a is closed from the bottom side with a suitable film 8. Further, a protective cap 9 is fitted to the lower end of the container body 1, and a through hole 9a through which a pin for piercing the water dissolver 5 is inserted is provided in the protective cap. This piercing pin can normally be attached to the protective cap 9.

Next, the upper structure of the paper tube container will be explained with reference to FIGS. 3 and 4 showing the upper part of the container body.

A ring 2 made of plastic is welded to the upper end of the container body 10 using a conventional ultrasonic welding device.

This ring 2 consists of a flange portion 14 at the upper end and a welded portion 15 welded to the melter body 10, and a flexible thin film material forming an upper cover is attached to the upper surface of the flange portion 14. Further, the diameter of the welded portion 15 is reduced toward the tip, and two protrusions 16 are formed over the entire circumference of this outer peripheral portion. When the ring 2 is vibrated by the ultrasonic welding device, this protrusion 16
It is melted and welded to the container body 10 by friction with the inner surface of the container body 10.

The container body 10 to which the ring 2 is welded has a plastic inner diameter film 1 inside one or more paper layers 11 formed by spirally winding a cardboard liner.
It is made of a straight paper tube with 2 pasted on it. The interior film 12 is formed of a long plastic tape 13 wound spirally, and the joint portion of the plastic tape 13 is bent into a flat edge 13a on one side and a bag shape on the opposite side. It is formed by overlapping the bag-shaped edge portion 13b.
Then, the seam portion of the innermost paper layer 11 is placed on top of this seam portion. Therefore, the three-layer interior film formed of the plastic tape 13 slightly protrudes inward of the container body 10 at the seam portion of the paper layer 11.

The upper end of the container body 1 is formed with a ring mounting part 1a whose diameter is expanded outward in a tapered shape. The angle of inclination of this mounting portion 1a is formed to be slightly larger than the angle of inclination of the ring welded portion 15.

According to experiments conducted by the applicant, a range of 3 to 6 degrees is most suitable for welding the ring 2 to the tapered angle of the mounting portion 1a on the upper part of the container body.

That is, when the ring 2 is ultrasonically welded to the container body 10, the ring 2 is attached to the horn of the ultrasonic welding device, and together with the horn, approximately 18,000
Vibrates at Hz. At this time, the welded part 1 of the container body
If the taper angle a is smaller than 3 to 6 degrees, the amount of heat generated by friction will be small and complete welding will not be achieved. If it is larger than this range, the downward load on the horn, that is, when the ring 2 is ultrasonically vibrated along its axial direction, the downward load on the horn acts on the ring 2, causing the flange portion 14 to It will become uneven and there is a risk that the ring will break.

When manufacturing the above-mentioned paper tube container 10, a metal can 3 containing quicklime 4 and a water container 5 is inserted from below into a container body 1 formed of one or more paper layers 1 and an inner film layer 12. The metal can 3 and the bottom lid 7 are wrapped and secured to the lower end of the container body.

Thereafter, the ring 2 is welded to the upper part of the container body 10 using an ultrasonic welding device.

In this case, the diameter of the upper end of the container body 10 is expanded in advance into a tapered shape to form the ring attachment part 1a,
The paper tube container 10 thus formed is housed in an anvil whose upper end is tapered to correspond to the container body, and held so that the container body 10 does not deform. After the ring 2 is mounted on the mounting portion 1a of the container body 10, the horn of the ultrasonic welding device is pressed against the ring 2 to vibrate the ring 2.

Since the attachment part 1a of the container body 10 is formed in a tapered shape, the welded part 15 of the ring 2, that is, the two protrusions 16 of this welded part, completely contact the inner surface of the attachment part 1a of the container body, and the welded part 15 of the ring 2 completely contacts the inner surface of the attachment part 1a of the container body. sealed. Furthermore, since the joint part of the interior film 12 is formed in three layers, even if a gap is formed at the joint part of the paper layer that overlaps the joint part of the interior film, only a part of the film will slip into this gap. This prevents the film inside the container body from slipping into the gaps between the paper layers. Therefore, the ring 2 and the interior film 12 can be completely welded together without any gap.

[Effects] As is clear from the above, the paper tube container of the present invention allows ultrasonic welding of the ring and the paper tube extremely easily and reliably, and reliably prevents leakage of the internal liquid that requires high temperature treatment. At the same time, manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a paper tube container illustrating an embodiment of the present invention, FIG. 2 is an exploded perspective view of the paper tube container shown in FIG. 1, FIG. 3 is a partially enlarged explanatory view, and FIG. The figure is an explanatory diagram taken along the - line in FIG. 2. 1... Container body, 1a... Mounting part, 2... Ring, 3
...Metal can, 10...Paper tube container, 11...Paper layer, 12...
Interior film, 13...Plastic tape, 14
...Flange portion, 15...Welded portion, 16...Protrusion.

Claims (1)

[Scope of Claims] 1. A paper tube in which a plastic interior film is attached to the inner peripheral surface of a cylindrical main body formed of one or more cardboard layers, and a metal lid that seals the lower end of the paper tube. , comprising a plastic ring welded to the inner peripheral surface of the upper end of the paper tube, and a flexible lid member made of a thin film material attached to the upper surface of the ring,
The ring has an upper flange portion to which the lid member is attached, a cylindrical welded portion extending from the flange portion and whose diameter decreases toward the tip, and a cylindrical welded portion that extends all the way around the outer circumferential surface of the welded portion. The upper end of the paper tube has a diameter expanded outward to form a frictional force over the entire circumference against the protrusion when the ring is ultrasonically vibrated along the axial direction. A paper tube container characterized by having a tapered ring attachment part. 2. The paper tube container according to claim 1, wherein the ring mounting portion at the upper end of the paper tube is tapered outward at an angle of 3 to 6 degrees. 3. Two protrusions are formed on the welded part of the plastic ring, and these two protrusions are welded to the ring attachment part of the upper end of the paper tube. Paper tube container as described.