JPH0450180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a paper tube container for storing a liquid such as alcoholic beverage.

[Prior Art] In general, paper tube containers that contain drinks such as alcoholic beverages and are equipped with heating means for warming or heating drinks are made by wrapping a thin plastic tape in a spiral to form an interior film. It is formed from a paper tube with multiple liners wound spirally around the outside of the film. Inside this paper tube, as a heating means, water and metal, which are housed in separate containers so as not to mix with the quicklime, are sealed inside the can, and when warming drinks, they can be heated from the outside using pins. Break open a container containing water and mix it with quicklime.

This conventional paper tube container is made by wrapping a metal can filled with quicklime and water at the lower end with a paper tube to seal it.
At the top, a metal lid with a pull-top spout is rolled up together with the paper tube to seal it.

However, in this conventional paper tube container, after the drink is poured into the container, it is sterilized under high temperature and pressure, and then the pressure is reduced, so the paper tube is easily deformed and the contents may leak.

For this reason, the present application proposes a paper tube container in which a plastic ring having an approximately L-shaped cross section is welded to the upper part of the paper tube, and the upper edge of this ring is sealed with a flexible thin film material, as shown in FIG. was developed.

That is, in this paper tube container, a ring 2 having a substantially L-shaped cross section for attaching a sealing thin film material is welded to the upper end of the paper tube 1, and a metal can 3 having a substantially truncated conical shape is inserted from the bottom side. Quicklime 4 and a water container 5 are sealed inside this metal can 3 with a metal lid 7 via a buffer cardboard 6.
It is rolled up together with the lower edge of the container to seal the contents, such as alcoholic beverages. This metal lid 7 is formed with an air vent hole 7a for releasing water vapor when water and quicklime react, and this air vent hole 7a is closed from the outside with a film 8. Furthermore, at the lower end of the paper tube 1,
A protective cap 9 with a hole 9a for a pin is attached, and normally a pin for piercing the water container 5 is attached to this protective cap 9.

When heating the contents, a pin is inserted through the pin hole 9a of the protective cap 9, the film 8 and cardboard 6 are torn and inserted into the metal can 3, and the water container 5 is pierced. As a result, the water and quicklime react to generate heat, warming the contents such as sake.

According to this paper tube container, even when the contents are filled, sterilized at high temperature, sealed with a flexible thin film material, and then cooled to room temperature, the flexible thin film prevents the volume from decreasing due to the reduced pressure of the internal air. The material simply follows and bends, preventing the paper tube from deforming and preventing the contents from leaking. Moreover, when drinking the contents, it is only necessary to tear the thin film material, and no dangerous cuts are formed.

[Problems to be Solved by the Invention] The plastic ring 2 welded to the upper end of the paper tube 1 has a protrusion 2a on the outer periphery as shown in FIGS. is vibrated by an ultrasonic welding device, and the protrusion 2a and the inner film 1a inside the paper tube 1 are welded together.

When this ring 2 is welded to the paper tube 1 using ultrasonic waves, since the inner film is thin, the ridges 2a of the ring
The interior film 1a may be pressed and slip into the seam of the liner 1b spirally wound around the outside of the interior film, and this portion and the protrusion 2a of the ring may not be completely welded. There is a problem that the contents may leak.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a paper tube in which a ring to which a thin film material is attached can be completely welded.

[Means for Solving the Problems] In the paper tube manufacturing method according to the present invention, a plastic tape of a predetermined width is spirally wound around a rotating mandrel to form an interior film, and a plurality of ribbon-like In the method for manufacturing a cylindrical paper tube in which a liner is spirally wound, one side of the plastic tape is folded back to the outside of the mandrel to form a folded part before being wound around the mandrel;
The other side of the plastic tape is wrapped over the folded portion to form a seam portion in which at least three layers of plastic tape are stacked, and the innermost liner of the plurality of liners is wrapped at the side edge of the seam portion. The liner is overlapped on top of the plastic tape while partially covered, and the innermost liner is pressed and crimped onto the plastic tape using a plurality of pressure belts that are placed side by side and driven. The joint portion of the plastic tape is directly pressed by a film edge pressing belt, and the plastic tapes at the joint portion are pressed together.

[Function] According to this paper tube manufacturing method, when the plastic tape that forms the interior film is wound spirally around the mandrel, at least three layers of plastic tape are overlapped at the joint part, and a part of the joint part is It is wrapped over the plastic tape, covering the side edges of the innermost liner. As a result, the seam between the innermost liners that are adjacent to each other overlaps the seam portion of the plastic tape. When wrapping the innermost liner onto the plastic tape, the seam of this plastic tape should be
This liner is pressed and crimped onto the plastic tape by the pressure belt, and at the same time, the liner is directly pressed and crimped by the film edge pressure belt, so that at least three layers of plastic tape at the seam are tightly attached to each other. be done.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[Example] FIGS. 1 to 3 show a state in which a paper tube is manufactured by the method of the present invention, and FIG. 1 shows a state in which a plastic tape 11 and liners 12, 13, and 14 are sequentially wound around a mandrel 10. This is shown diagrammatically. 2 shows the state seen from the direction of the - line in FIG. 1, and FIG. 3 shows the state seen from the direction of the - line in FIG.

According to one embodiment shown, the mandrel 10 is rotated at a predetermined speed in the direction indicated by the arrow A, and during this rotation the plastic tape 11 forming the interior film is rotated.
and paper liners 12, 13, and 14 supplied from different directions along the circumference of the mandrel 10 are sequentially wound to form a paper tube.

Immediately before the rear edge of the plastic tape 11 is wound around the mandrel 10 in the winding direction, it is folded back to the outside of the mandrel 10 by a plurality of rods or rotating rollers 16 to form a folded part 11a having a predetermined width. The opposite edge of the plastic tape 11 is wrapped around the upper side of the folded portion 11a, so that three layers of films are superimposed on the seam of the spirally wound plastic tape 11. Then, before the innermost paper is pasted, this seam part is connected to the hot air supply port 1.
It is heated by high temperature air supplied from 7.

The first sheet of paper pasted on top of the interior film formed of the plastic tape 11 is formed of a liner 12.

After the liner 12 is heated by the heater 19, it is further heated by high temperature air jetted from the hot air supply port 18. Thereafter, as shown in FIG.
The plastic tape 11 is pasted onto the folded portion 11a, that is, the seam portion, respectively. Therefore, the liner 12 is applied with each side edge covering a portion of the seam of the plastic tape 11.

Then, the liner 12 is connected to a plurality of pressure belts 15.
At the same time, the plastic tape 11 is pressed and adhered to the plastic tape 11 at the step a, and the joint portion of the plastic tape in which the three layers of film are overlapped is directly pressed by the plastic tape edge pressing belt 15b.

Both the liner pressing belt 15a and the plastic tape edge pressing belt 15b are formed of round belts wound around two rollers 20, 20, and are driven to rotate in the direction of arrow B by an appropriate drive device. Ru. In this embodiment, 12 round belts are provided.

As shown in FIG. 3, the pressure belts 15a are arranged side by side over the entire width of the liner 12. The plastic tape edge pressing belt 15b is formed of a round belt at the rear end in the winding direction, and directly presses onto the seam where the folded part 11a of the plastic tape 11 and the other edge on the opposite side overlap. placed in position.

The paper tube used in the method of this embodiment has an outer diameter of about 70 mm, the width of the liner 12 in this case is about 115 mm, and the interval between the joints of the liner 12 is about 0 to 0.7 mm. Further, the folded portion 11a of the plastic tape 11 was set to 7.mm, so that three layers of plastic tape were stacked over a range of at least 5 mm.

After the liner 12 is pasted onto the plastic film 11 by the pressure belt 15a, the liner 13 and the liner 14 are similarly heated with high temperature air from the heater 19 and the hot air supply port 18, respectively.
Apply sequentially over the previously applied liner.

The number of these liners can be set as appropriate depending on the use of the paper tube container.

Note that the temperature conditions of the heater 19 for preheating each liner and the hot air from the hot air ports 17 and 18 are selected at a temperature of 200 to 750°C depending on the type of liner and plastic film to achieve an optimal welding state.

The paper tube thus formed is cut into appropriate dimensions and formed into a paper tube container as shown in FIG. 4 for storing alcoholic beverages, for example.

Even if the joint between the innermost liners 12, 12, that is, the gap between the adjacent side edges is large, this paper tube can be used with plastic tape 1 that overlaps the joint.
Since at least three layers of plastic tape 11 are overlapped at the seam part 1, the inner surface of the paper tube will not be greatly depressed due to the interior film entering the gap when the plastic ring is ultrasonically welded. Furthermore, this plastic tape 11
Since the folded portion 11a is directly pressed and bonded to the edge of the plastic tape 11 overlaid thereon by a pressure belt, leakage from this portion is prevented.

[Effects of the Invention] As is clear from the above, according to the present invention, the seam portions of at least three layers of plastic tape are directly crimped to reliably bond these plastic tapes, and The seams of the innermost liner are placed one on top of the other,
It is possible to form a paper tube having an inner film that can withstand ultrasonic welding of a plastic ring and ensure liquid tightness with the ring.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram taken along the line - in FIG. 1, FIG. 3 is an explanatory diagram taken along the line - 5 is an exploded perspective view of the paper tube container shown in FIG. 4, and FIG. 6 is an enlarged explanatory view of a part of the paper tube container shown in FIG. 4. 1...Paper tube container, 2...Plastic ring,
3... Metal can, 9... Protective cap, 10... Mandrel, 11... Plastic tape, 11a... Turned part, 12, 13, 14... Liner, 15...
Pressure belt, 16, 20...Roller, 17, 18
...Hot air supply port, 19...Heating device.

Claims (1)

[Claims] 1. A method for manufacturing a cylindrical paper tube, in which a plastic tape of a predetermined width is spirally wound around a rotating mandrel to form an interior film, and a plurality of ribbon-shaped liners are spirally wound on the interior film. Before wrapping the plastic tape around the mandrel, one side of the plastic tape is folded back to the outside of the mandrel to form a folded part, and the other side of the plastic tape is wrapped over the folded part to create a seam in which at least three layers of plastic tape are stacked. The innermost liner of the plurality of liners is overlapped on the plastic tape with its side edges covering a part of the seam part, and a plurality of pressing belts are driven while being juxtaposed with each other. At the same time, the innermost liner is pressed and crimped onto the plastic tape, and at the same time, the seam part of the plastic tape is directly pressed by a film edge pressing belt placed side by side with these pressing belts, and the plastic tape at the seam part is pressed together. A method for manufacturing a paper tube, characterized by crimping.