JPH0541002Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an ultrasonic horn used to attach a pouring tool to a paper container.

(Prior Art) Paper containers are popular as containers for various contents such as milk, youth, and alcoholic beverages. Some of these paper containers have a plastic pouring device attached to make it easier to pour out the contents. In this case, the means for attaching the pouring device to the paper container is as shown in the cross section in A linear pressure seal part 31 is attached to the tip.
Using an ultrasonic horn 30 having a flange 2 of a thermoplastic dispensing tool 1,
Generally, it is thermally fused to the thermoplastic resin layer 22 of the paperboard material 20.

(Problem to be solved by the present invention) In the conventional ultrasonic horn, as shown in FIG. 3, the peripheral edge of the flange 2 of the spouting tool 1, which is heat-sealed to the paperboard material, tends to curl up. This can cause problems in subsequent processes such as filling the contents, and can cause the contents to solidify and get caught in the small gap between the rolled-up flange and the paperboard material after opening. There were concerns that it would cause deterioration.

This ensures that the linear pressure seal part 31 of the ultrasonic horn does not come off the outer periphery of the flange 2 in the positional relationship with the opposing flange 2 during heat fusion, and that the entire pressure seal part 31 is always attached to the outside of the flange 2. This is because the pattern of the pressure seal part 31 is formed to be smaller than the outer shape of the flange 2 so as to be located inside the periphery, taking into account errors in machine accuracy. In this way, since the pressure seal part 31 is located inside the outer peripheral edge of the flange 2, the flange 2 is located outside the part thermally fused by the pressure seal part 31. Under the influence of shrinkage during heat fusion, the outer periphery is deformed so as to warp.

(Means for Solving the Problems) As shown in FIG. 1, the ultrasonic horn according to the present invention is a pouring tool provided on a paperboard material 20 for paper containers having thermoplastic resin layers 21 and 22 on both the front and back sides. An ultrasonic horn heat-seals the flange 2 and the thermoplastic resin layer 22 that will become the inner wall surface of the paper container of the paperboard material 20 with the tube portion 3 of the flanged pouring tool 1 inserted into the through hole 23. At the tip of the ultrasonic horn 10, there is a linear first wire located inside facing the outer peripheral edge of the flange 2 as a contact portion with the thermoplastic resin layer 21 which becomes the outer wall surface of the paper container.
In addition to forming the seal portion 15, there is a second planar surface that is located outside the first seal portion, contacts more roughly than the first seal portion, and includes a repeating pattern of contact portions and non-contact portions. It is characterized in that a seal portion 16 is also formed.

(Function) When using an ultrasonic horn, the first seal portion 15 of the ultrasonic horn 10 is the contact surface between the flange 2 of the pouring tool 1 and the thermoplastic resin layer 22 of the paperboard material 20.
However, over the entire circumference of the flange 2, the contact surface generates heat at a location facing the first seal portion, and the mutual resins melt and are thermally fused. At the same time, the second seal part 16 of the ultrasonic horn 10 heat-seals the flange 2 in the outer peripheral area of the first seal part 15 to the thermoplastic resin layer 22. The second seal part 16 heat-seals the paperboard material 20 and the flange 2 by making the contact area coarser than that of the first seal part 15. Roughly heat seal the outside of the flange 2.
This prevents it from rolling up.

(Example) The present invention will be described below based on an example shown in the drawings.

FIG. 1 is a cross-sectional view showing how an ultrasonic horn according to an embodiment of the present invention is used. In the figure, the paperboard material 20 for paper containers has thermoplastic resin layers 21 on both the front and back sides.
22, and a through hole 23 is provided at the intended insertion position of the pouring tool. On the other hand, the pouring tool 1 has a cylindrical portion 3 for discharging the contents, and a flange 2 that is heat-sealed to a thermoplastic resin layer 22 located on the inner surface of the paper container of a paperboard material 20. Accordingly, in order to ensure a perfect seal before opening, the cylindrical portion 3 may be covered with a cap 4, or a closing membrane 5 having a gripping portion 6 and surrounded by a thin line 7 may be provided. I'm doing it.

The pouring tool 1 is inserted into the through hole 23 of the paperboard material 20, and the tip of the cylindrical portion 3 or the cap 4 is made to protrude to the outside of the paper container. Next, while the backing material 29 is pressed from the inner surface of the paper container and the position of the pouring tool 1 is fixed, the ultrasonic horn 10 is pressed from the outer surface of the paper container.
is brought into contact. The ultrasonic horn 10 has an outer shape at the tip facing the paperboard material 20 that is equivalent to or larger than the outer shape of the flange 2, and has a
A linear first seal portion 15 is formed, and a second seal portion 16 with a rough contact degree is further formed outside the first seal portion 15. The second seal portion 16 is formed in a comb-teeth shape so that contact and non-contact are alternately repeated so that the entire surface thereof does not come into solid contact with the paperboard material 20.

Note that the ultrasonic horn 10 forms a recess 11 on the opposing surface of the paperboard material 20 depending on the protrusion level of the tip of the cylindrical portion 3 or the cap 4 protruding toward the outer surface of the paper container.
The first seal part 15 and the second seal part 16 are provided.
It is necessary to take care that the material can be sufficiently contacted with the paperboard material 20. When the ultrasonic horn 10 contacts, the thermoplastic resin layer 22 of the paperboard material 20
Heat melting occurs between the flange 2 and the flange 2 of the pouring tool 1, and the two are bonded together. The bonding pattern follows the uneven pattern of the tip of the ultrasonic horn 10 and corresponds to the pattern of the first seal portion 15 and the second seal portion 16. Of these, the first
The seal portion 15 forms a heat-sealed line that will not leave any traces, achieving complete sealing. On the other hand, the second seal part is heat-sealed at the comb-shaped protrusions and not heat-sealed at the recesses, so it is not completely sealed.
By having a rough degree of contact, the contact pressure can be almost concentrated on the first seal portion 15 during heat fusion, and the integrity of the seal can be improved, and at the same time, the pouring tool 1
It is possible to prevent the outer peripheral edge of the portion where the flange 2 is heat-sealed to the paperboard material 20 by the first seal portion 15 from curling up by properly heat-sealing the contact portion. .

2A and 2B show various patterns of the first seal portion 15 and the second seal portion 16 at the tip of the ultrasonic horn of the present invention. In each of the above figures, the shapes of the tips of the ultrasonic horns 10 are different, but the shapes themselves have no special meaning and are merely matched to the shape of the flange 2 of the spouting tool 1. As described above, the first seal part 15 almost matches the outer shape of the tip of the ultrasonic horn, which reflects the outer shape of the flange 2, and the second seal part 16 is located outside the first seal part 15. It is important to cover the entire outer peripheral edge of the flange 2 of the dispensing tool 1 so that the degree of contact is rough, but the shape may be comb-shaped as shown in FIG. 2A, net-like as shown in FIG. 2B, or other shapes. , a thin line drawn around the first seal portion 15, etc. may be used as desired.

Further, the first seal part 15 and the second seal part 16 are not limited to the shape of continuous integral parts as shown in FIGS. 2A and 2B, but may be separated from each other.

The ultrasonic horn 10 of the present invention may be used when heat-sealing the flange 1 to the unfolded paperboard material 20 before assembling the paper container, or when assembling the body of the paper container and It may also be used when attaching a pouring tool to a paper container that is in the process of being formed with at least one side of the container being open.

(Effects of the invention) According to the ultrasonic horn according to the invention, a completely sealed seal can be performed between the paperboard material and the flange of the pouring tool at the first sealing part, and at the same time, at the second sealing part, By sealing with an appropriate degree of contact, contact pressure is concentrated on the first seal part to ensure sealing integrity, and the edge of the flange is prevented from rolling up at the outer peripheral edge of the first seal part. It is possible to prevent unnecessary snags when inserting the filling nozzle in a later step, and at the same time, it is possible to maintain the quality of the contents. Since the second seal part provided on the ultrasonic horn has a simple pattern, there are no problems in manufacturing it, and extremely great effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the installation state of a dispensing tool using an ultrasonic horn according to an embodiment of the present invention, and FIG.
Both Fig. 2B and Fig. 2B show the first horn of the present invention.
FIG. 3 is an explanatory view showing various patterns of the seal part and the second seal part, and FIG. 3 is an explanatory view showing the mounting state of the pouring tool using a conventional ultrasonic horn. 1...Pour tool, 2...Flange, 3...Cylinder part,
10... Ultrasonic horn, 15... First seal part,
16...Second seal portion, 20...Paperboard material, 21
... Thermoplastic resin layer on the outer surface of the paper container, 22 ... Thermoplastic resin layer on the inner surface of the paper container.

Claims (1)

[Scope of utility model registration request] When the cylindrical part of the flanged spouting tool is inserted into the through hole for the spouting tool provided in the paperboard material for paper containers, which has thermoplastic resin layers on both the front and back sides, the inner wall surface of the paperboard material becomes heated. This is an ultrasonic horn that heat-seals the plastic resin layer and the flange of the pouring tool, and the tip of the ultrasonic horn is provided with a part facing the outer periphery of the flange as a contact part for the thermoplastic resin layer that becomes the outer wall surface of the paper container. and a linear first seal part located inside the first seal part, and a planar second seal part located outside the first seal part and having a rougher degree of contact than the first seal part. An ultrasonic horn for paper containers characterized by: