JPH0428536B2 - - Google Patents

Abstract

PURPOSE:To keep the temperature of a horn, which abuts against a plastic ring, constant and consequently prevent the frictional heat from being built up in the horn by a method wherein cooling air is blasted through the air jets of a cooling air pipe, which is arranged at the peripheral part of the horn. CONSTITUTION:A cooling air pipe 51 annularly surrounding a horn above the tip part, which abuts against a plastic ring 2, of the horn 49. The cooling air pipe 51 is bonded through a proper bracket 52 to the horn 49 so as to be vertically movable together with the horn 49. A large number of air jets 52 are bored on the side, which faces to the horn 49. The tip part of the horn 49 of a supersonic vibration device 48 fits to the inner peripheral surface of the plastic ring 2 so as to vibrate the plastic ring 2 at a super high speed in order to melt the projecting strips of the plastic ring 2 by the frictional heat and to bond the ring to an interior finish film 1a. Though the generated frictional heat is transmitted to the tip part of the horn 49, since the horn 49 is cooled at all times by the air blasted from the cooling air pipe 51 through the jets 52 to the horn, no heat build-up in made on the horn 49 even after the continuous welding of a large number of plastic rings 2 with the horn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic welding device for welding a plastic ring to the upper end of the main body of a paper tube container with a heating function for warming Japanese sake.

[Prior Art] Paper tube containers with a sake warming function are known. This paper tube container is formed of a cylindrical body made of a plurality of spirally wound cardboard layers.
A metal can containing quicklime as a heating means and water sealed in a separate container so as not to mix with the quicklime is inserted into the cylindrical body.

This metal can is inserted into the paper tube from the lower end thereof, and is tightly wound and fixed under the paper tube container together with the metal bottom cover. 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.

If you want to warm up the drink inside, mix the water in the metal can with quicklime.

According to this conventional paper tube container, the upper end as well as the lower end are sealed by rolling a metal lid, so after pouring the drink, it is sterilized under high temperature and high pressure.
If the pressure is reduced after this, the paper tube container will easily deform.
Contents may leak.

For this reason, the applicant has developed paper tube containers shown in FIGS. 4 to 6.

That is, this paper tube container 10 has a metal can 3 disposed inside a container body 1 to which an inner film is attached, and quicklime 4 and a water container 5 as heating means are placed inside the metal can 3.
and accommodates. 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 water vapor etc. when water and quicklime react, and this hole 7a is provided with an appropriate film 8.
It is closed from the bottom side. Further, a protective cap 9 is fitted to the lower end of the container body 1, and a pin for piercing the water dissolver 5 is inserted into the insertion hole 9 in the protective cap.
A is provided. This piercing pin can normally be attached to the protective cap.

The upper end of the immunity container main body 1 is sealed with a flexible thin film material via a plastic ring 2.
That is, the ring 2 is ultrasonically welded to the interior film 1a at the upper tapered portion of the container body 1, and a flexible thin film material is attached to the upper surface of the ring 2 to form the upper lid.

As a result, even if the sake inside is sterilized under high temperature and pressure, and the top lid is sealed before cooling, the top lid made of a flexible thin film material will only bend downward and prevent the container body from deforming. Leakage is prevented. It is also safe as no dangerous metal cuts are formed.

However, when welding the plastic ring 2 to the tapered mounting portion at the upper end of the container body 1, the horn of the ultrasonic welding device comes into contact with the inner surface of the plastic ring 2, causing the ring 2 to vibrate at an ultra-high speed.
When the plastic rings 22 are successively welded to a large number of paper tube container bodies 1 one after another, the heat of the rings 2 is accumulated in the horn. For this reason, the plastic ring 2 tends to adhere to the horn, making it difficult to accurately weld it to the container body 1 at the correct position. If the plastic ring is tilted or not installed in an accurate position, the paper tube container may look unsightly, and the plastic ring may become wavy or crack. Therefore, it has been desired to develop an apparatus that can accurately and efficiently weld plastic rings.

The present invention was made in view of the above problems, and
The purpose of the present invention is to provide an ultrasonic welding device that can accurately and efficiently manufacture a paper tube container in which the paper tube body does not deform even when the top lid is sealed and cooled to room temperature after sterilization at high temperature and high pressure. .

[Means for Solving the Problems] The ultrasonic welding device according to the present invention includes a horn that comes into contact with a plastic ring that is welded to the upper part of a tube container body, and a contact portion with the plastic ring around the horn. A cooling air pipe arranged in an annular manner at a predetermined interval from the air pipe, and a plurality of air injection holes bored on the side facing the horn of the air pipe, the part of the horn that comes into contact with the plastic ring. It is characterized by being kept at a constant temperature.

[Function] According to this ultrasonic welding device, the horn that comes into contact with the plastic ring and vibrates the ring at an ultra-high speed blows cooling air through the air jet holes of the cooling air pipe arranged around the horn. attached,
maintained at a constant temperature. Therefore, even when continuously welding plastic rings, no frictional heat is accumulated in the horn.

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

[Embodiment] FIG. 1 shows the overall layout of a paper tube container manufacturing apparatus equipped with a welding device according to an embodiment of the present invention.

This paper tube manufacturing apparatus 20 includes a cylindrical cam 22 supported at a predetermined position on a base 21 via three pillars 19, and a cam groove 22a is provided around the entire circumference of the cylindrical cam 22. They are arranged continuously.

Around the cylindrical cam 22, there are provided a paper tube container feeding station 25 for supplying the paper tube container body 1, a ring attachment station 26 for attaching a plastic ring to the upper end of the paper tube container body 1, and a paper tube container feeding station 26 for attaching a plastic ring to the upper end of the paper tube container body 1. A welding station 27 that welds a plastic ring to the inner film of a tube container.
and a discharge station 28 for discharging the paper tube container to which the ring is welded are arranged in this order.
Then, the turntable 2 below the cylindrical cam 22
3 is rotated intermittently in the direction of arrow A along each of these stations.

Cylindrical receiving members 30 are fixed to the outer periphery of an annular turntable 23 coaxially provided below the cylindrical cam 22 with bolts or the like at equal intervals.

Further, a cylindrical support stand 24 is fixed to the inner peripheral part of the turntable 23, and this support stand 24
The sliding member 32 slides on an appropriate guide rail provided in the
are fitted so that they can move only in the vertical direction. A roller 32a that rolls within the cam groove 22a of the upper cylindrical cam 22 is provided at the upper end of the sliding member 32.
A clamping means 35 is provided at the lower end of the receiving member 30, and is capable of moving in and out of the receiving member 30 in the vertical direction. Clamping arm 36 of this clamping means 35
is opened at the supply station 25 and discharge station 28 and closed at other locations by a suitable cam arrangement driven via a cam drive shaft 37.

The cam groove 22a of the cylindrical cam 22 allows each of these clamping means 35 to be attached to the receiving member 3 according to each work station when the turntable 23 rotates.
vertically between a high position above 0 and a low position accommodated within the receiving member 30.

The ring attaching station 26 is provided with a ring attaching device 38 for attaching the plastic ring 2 to the upper end of the paper tube container body 1, and is provided with a turret 40 that is rotationally driven in synchronization with the turntable 23.

This turret 40 is connected to the base 2 by a rotating shaft 39.
1, and four guide cylinders 41 are mounted on the circumference thereof at equal intervals. This guide cylinder 41 is larger than the plastic ring 2.
The plastic ring supply device 46 is formed with a small diameter of 0.1 to 1 mm and has a tapered upper end.
The plastic ring 2, which is transferred from the plastic ring 2 via the transfer rail 47, is inserted into the plastic ring 2. 42 is a push-in pad for fitting the plastic ring 2 into the guide cylinder 41, and 43 is a push-out pad that is pushed out from the guide cylinder 41 and attached to the upper end of the paper tube container body. These pads 42, 43 are actuated by air cylinders 44, 45, respectively.

This turret 40 is rotated by a timing belt in synchronization with the turntable 23 and a cam device via the cam drive shaft 38, and when the receiving member 30 of the turntable 23 stops at the ring mounting station 26, the receiving member 30 and the receiving member 30 are rotated by a timing belt. The guide cylinder 41 is stopped at the aligned position.

A welding device 48 according to an embodiment of the invention is installed in the ring welding station 27.

As shown in FIG. 2, this welding device 48 includes a horn 49 that is moved up and down by a cylinder 50. When welding the plastic ring 2, the tip of the horn 49 is inserted into the plastic ring 2 attached to the upper end of the paper tube container main body 1, and is attached to the inner peripheral surface of the plastic ring 2 as shown in FIG. They are brought into contact and vibrated at an extremely high speed of approximately 18,000Hz, for example.

Further, a cooling air pipe 50 is provided above the tip of the horn 49 that comes into contact with the plastic ring 2.
surrounds it in a ring. This cooling air pipe 5
0 is connected to the horn 49 via a suitable bracket 52 so as to be able to move up and down.
A large number of air ejection holes 51 are bored on the side facing 9.

The cooling air pipe 51 is supplied with air from, for example, a working air source of an air cylinder, and blows air out onto the outer peripheral surface of the horn 49 through the air blowing holes 51 . As a result, the frictional heat generated when the plastic ring 2 is vibrated at an extremely high speed is not accumulated in the horn 49.

Next, the operation of the welding device will be explained together with this paper tube container manufacturing device.

As shown in FIG. 1, the paper tube container main body 1 is supplied to the clamp means 35 in the paper tube container supply station 25 with the clamp arm 36 open.
Thereafter, the clamp arm 36 is closed, and as the turntable 23 rotates, the roller 32a of the sliding member 32 rotates along the cam groove 22a, and the clamp arm 36 descends into the receiving member 30. The turntable 23 stops after rotating by a predetermined angle, and at this time, the clamp arm 36 is accommodated together with the paper tube container main body 1, and the receiving member 30 is placed on the ring mounting station 26.

At the ring mounting station 26, the turret 40 of the plastic ring mounting device is rotated intermittently in synchronization with the turntable 23.
A guide cylinder 41 having a plastic ring 2 is coaxially aligned with the upper side of the paper tube container body 1.

Then, the push pad 43 is connected to the air cylinder 4.
5, the plastic ring 2 is pushed out from the guide cylinder 41 and fitted accurately into the upper end of the paper tube container body 1.

Thereafter, the turntable 23 rotates, and the paper tube container body 1 with the plastic ring 2 attached thereto is rotated and moved to the ring welding station 27, as shown in FIG.

As shown in FIG. 3, in the ring welding station 27, the tip of the horn 49 of the ultrasonic vibrator 48 fits into the inner peripheral surface of the plastic ring 2.
Vibrate at ultra-high speed. At this time, the protrusions on the outer periphery of the plastic ring 2 rub against the inner film 1a of the paper tube container main body 1, and this frictional heat melts the protrusions of the plastic ring 2 and joins it to the inner film 1a. The frictional heat generated at this time is
However, since this horn 49 is constantly cooled by the air blown from the cooling air pipe 51 through the jet hole 52, even after welding a large number of plastic rings 2 continuously, this horn 49 No heat is accumulated in the horn 49.

When the turntable 23 further rotates, the clamping means 35 is moved to the ejection station 28 and is also raised by the cam groove 22a of the cylindrical cam 22 to a high position above the receiving member 30. After the clamp arm 36 is released, the paper tube container body 1 is discharged via a conveyor or the like.

[Effects] As is clear from the above, according to the welding device according to the present invention, the frictional heat of the plastic rings is not accumulated in the horn, and therefore, even when welding a large number of plastic rings in succession, the It is possible to accurately weld to the correct position on the paper tube container, and it is possible to efficiently manufacture the paper tube container.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the entire paper tube container manufacturing apparatus equipped with a welding device according to an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory view of the welding station shown in the figure, and FIG. 3 is an enlarged explanatory view showing the welding state. Figures 4 to 6
The figure shows a paper tube container. FIG. 4 is an explanatory diagram of the inside of the paper tube container, FIG. 5 is an explanatory diagram of the disassembled state, and FIG. 6 is a partially enlarged explanatory diagram. 1... Container body, 2... Plastic ring,
DESCRIPTION OF SYMBOLS 10... Paper tube container, 21... Base, 22... Cylindrical cam, 22a... Cam groove, 23... Turntable, 25... Supply station, 26... Mounting station, 27... Welding station, 28 …
...Ejection station, 30...Receiving member, 32...
...Sliding member, 35... Clamp means, 36... Clamp arm, 40... Turret, 41... Guide cylinder, 42... Push-in pad, 43... Push-out pad, 48... Ultrasonic vibration device, 49 ...Horn, 51...Cooling air pipe.

Claims (1)

[Claims] 1. A horn that comes into contact with a plastic ring that is welded to the upper part of the paper tube container body, and a cooling air pipe that is arranged in an annular shape around the horn at a predetermined distance from the part that makes contact with the plastic ring. An ultrasonic welding device characterized in that the air pipe has a plurality of air jet holes bored on the side facing the horn, and the portion of the horn that comes into contact with the plastic ring is maintained at a constant temperature.