JP2003062908A - Ultrasonic horn and ultrasonic welding operation assembly having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic horn which can be welded to a film without lowering a strength of a tearing tape and to provide an ultrasonic welding operation assembly having the same. SOLUTION: The ultrasonic horn 1 comprises an anvil 2 to be cooperated therewith to ultrasonic weld the tearing tape after packaging to the film as a packaging material. The horn 1 further comprises a seal protruding stripe section 3 having at least one protruding stripe for forming a sealing line at a distal end of the horn 1 brought into contact with the anvil 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic horn for ultrasonically welding a tape used for opening a package to a film forming the package, and an ultrasonic welding actuating assembly having the ultrasonic horn.

[0002]

2. Description of the Related Art Since a tape is welded to a film,
It is made of the same material as the film, but it is thicker than the film because it requires strength when opened.

When the package is, for example, a sausage, the tape is a vertical cut tape extending substantially the entire length along the longitudinal direction of the package, and a horizontal cut tape provided in the circumferential direction (simply as a tape piece). Sometimes I say). In the case of the horizontal cut tape, as shown in FIG. 3 of the accompanying drawings, the tape piece 51 is circumferentially attached to the end of the package 50 such as sausage. Tape piece 51
Extends in the circumferential direction of the package 50, and the specific seal line 5
The second portion is welded to the film of the package 50. Therefore, at the time of unsealing, the non-welded portion of the tape piece 51, in many cases, the end portion is picked up with a finger and pulled up in the direction of the arrow, and by pulling strongly, the film of the package 50 is torn in the circumferential direction, and the unsealing is performed. It The form of the seal line 52 is variously implemented, and for example, there is one as shown in FIGS. 4 (A) and 4 (B).

The longitudinal cut tape is capable of welding the tape along the traveling tubular film when forming the belt-shaped film into a tubular shape for filling the contents, and the stable welding is obtained. It is uneconomical because it is required over the entire length. In this respect, the horizontal cut tape is economical because the tape piece is short, but the tape requires movement in synchronization with the film at the time of welding, which complicates the mechanism.

On the other hand, various methods are known as heating for welding (sealing) the tape to the film, for example, high frequency sealing and ultrasonic sealing. In order to sufficiently secure the welding strength of the tape to the film, the tape is locally pressed to the film by the linear sealing ridges provided on the welding means to form the sealing line as shown in FIGS. This seal ridge is called a seal design. The high-frequency seal is apt to cause sparks, and the shape of the seal design is restricted in order to avoid the adverse effect caused by the sparks, which makes the design difficult. Therefore,
Ultrasonic sealing is widely used without the problem of sparks.

[0006] The ultrasonic sealing is performed by an anvil in which an ultrasonic horn, a film and a tape work together to squeeze the horn. Due to the structure of the packaging machine, the horn is located on the film side and the anvil is located on the tape side, which is the outside of the package. The horn and anvil are shown in FIG. 5, for example, when forming a seal line as shown in FIG.

In FIG. 5, the horn 60 is an anvil 61.
The lower surface facing to is flat, and the anvil 61 is provided with an oval-shaped seal projection portion 61A. And
The horn 60 is arranged on the film 53 side and the anvil 61 is arranged on the tape piece 51 side, and the film 53 and the tape piece 51 are sandwiched and heated between the horn 60 and the anvil 61. The tape piece 51 is firmly welded to the film 53 at the seal protrusion portion 61A to form the seal line 52.

[0008]

Conventionally, it has been believed that the seal ridges are provided on the anvil, and that by doing so, the tape is pressed firmly against the film to obtain sufficient welding strength. It was

However, in such a conventional method, since the tape is locally heated by the seal projection of the anvil, the tape is likely to be melted before the film to form a fragile portion, and the tape may be removed during or after the film is running. When an external force is applied to it, pinholes and the like are likely to occur, which may cause an unfavorable situation in view of the strength of the tape when opened and the possibility of bacteria invading the contents.

In view of such a situation, the present invention provides a horn for ultrasonic welding capable of ensuring the welding strength of a tape without causing pinholes or the like in the package, and a welding operation assembly having the same. The purpose is to

[0011]

An ultrasonic horn according to the present invention cooperates with an anvil to ultrasonically weld an unwrapping tape after packaging to a film as a packaging material.

In such an ultrasonic horn, the present invention provides:
It is characterized in that a seal ridge portion having at least one ridge for forming a seal line is formed on the tip end surface of the horn that comes into contact with the anvil. The form of the seal ridges is free, for example, straight lines, curved lines, a combination of the two, and the like, and the number thereof can be singular or plural.

According to the present invention as described above, since the seal ridge portion for locally heating is provided on the horn located on the film side, the film is melted before the tape piece and is welded to the tape piece. To do. Therefore, the tape piece does not melt first to form a pinhole or an excessively thin fragile portion. That is, the strength of the tape is maintained as it is. Even if the film has some weak points, the tape will be welded to the film to compensate for it.

The ultrasonic horn of the present invention constitutes an ultrasonic welding actuating assembly with the anvil. In this case, the tip surface of the anvil that comes into contact with the horn is a flat surface, or knurled on the tip surface. Are formed.

When the knurls are formed on the anvil, the tape is not displaced, so that the relative position with respect to the film is eliminated, and preferable welding without wrinkles can be performed. Although the knurls are effective in preventing misalignment, they widely and evenly hit the tape, so that the tape is not melted first, unlike the seal ridges, without local heating.

In the present invention, it is preferable that the anvil is provided with a suction port for adsorbing and holding the tape at a position corresponding to the outside of the formation region of the seal protrusion of the horn. By holding the tape at the suction port, it is possible to more reliably prevent the occurrence of a gap between the film and the film.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

In FIG. 1, (A) is a front view showing an ultrasonic welding operation assembly consisting of an ultrasonic horn and an anvil immediately before the film and tape piece are welded, and (B) is a welding tip surface of the horn. FIG.

In FIG. 1 (A), a weldable film F, which is a package filled with contents, is running in the direction of arrow A. In the illustrated example, the film F has a planar shape, and two films are in close contact with each other to form a single film or a flat film. The tape or tape piece T which is welded to the film F is usually the same material as the film F.

A horn 1 and an anvil 2 for ultrasonic welding are provided on both sides of the film F, and they can be moved toward and away from each other in the direction of the film F. Figure 1
At (A), the tape or tape piece T to be welded to the film F is located between the film F and the anvil 2. The horn 1, the anvil 2 and the tape piece T have no relative speed in the direction of arrow A with the film F at the moment of welding.
That is, the film F stops at that moment, or the horn 1, the anvil 2 and the tape piece T move at the same speed with respect to the film F traveling at a constant speed in synchronization with the moment.

In the present embodiment, the upper surface of the anvil 2, that is, the surface facing the horn 1, is a flat surface or a surface having knurls formed substantially uniformly over the entire surface.

On the other hand, as shown in FIG. 1B, the horn 1 is provided with a linear seal projection 3 at the center. This seal protrusion 3 is called a seal design,
It may have various forms such as a straight line, a curved line, or a combination of the two. Although the seal ridge itself is known, this is conventionally provided on the anvil, and the features of the present invention are as follows.
This seal ridge 3 is provided on the horn 1.

When the film F and the tape piece T are pressed by the horn 1 and the anvil 2, the ultrasonic energy is concentrated on the seal ridge 3 of the horn 1, and the film F is contacted with the seal ridge 3. Local heating. Therefore, this portion melts faster than the tape T, and adheres to the tape T. Then, as shown in FIG. 2A, the linear seal line 4 is firmly formed on the tape T. Due to the fact that the tape T melts later than the film F and the temperature does not rise like that of the film F, the thickness of the tape T is kept uniform even after the welding. The predetermined strength as the unsealing tape piece is maintained. On the other hand, since the film F melts before the tape piece as described above, the film F is locally thinned and a fragile portion is generated. However, as a package, a tape piece firmly reinforces this portion, and when opening, the fragile portion of the film rather facilitates breaking the film.

The seal ridge portion of the horn is shown in FIGS.
The present invention is not limited to the example of (A), and various forms can be adopted, for example, as shown in FIGS. It is possible to apply the various known seal protrusions formed on the anvil to the horn of the present invention as they are. Figure 2
(B) to (D) show the seal line formed with the tape piece, but the seal protrusion has the same shape as the seal line.

Although the present embodiment is shown as an example suitable for welding tape pieces, the present invention can also be applied to a vertical cut tape. The point is that the cut tape to be welded is welded to the film without lowering the strength, and the present invention can achieve the purpose for both types of cut tapes.

In the present invention, the anvil may be provided with a suction port for holding the tape.
By holding the tape by the suction port, the tape does not shift with respect to the film and enables stable welding. It is more preferable that the suction port is provided in combination with the knurled eyes described above. It is desirable that the suction port is provided outside the region where the ridge of the horn is formed, from the viewpoint of stable holding.

[0027]

As described above, according to the present invention, when the opening tape is ultrasonically welded to the film forming the package,
The ultrasonic horn arranged on the film side was provided with a seal ridge as a seal design, so when the film and tape were pressed between the horn and the anvil, the film melted from the film side, resulting in the tape. The fragile portion does not occur in the tape, the tape strength is sufficiently maintained at the time of opening, and the pinhole is not generated even when an external force is applied through the tape while the film is running or after packaging.

[Brief description of drawings]

FIG. 1 (A) is a front view showing a horn and anvil as an embodiment of the present invention in relation to a film and a tape, and FIG. 1 (B) is a perspective view of the horn.

FIG. 2 is a view showing a seal line formed on the tape piece according to the present embodiment, FIG. 2 (A) is a seal line formed by the horn of FIG. 1, and FIGS. 2 (B) to (D) are other diagrams. Shows a seal line formed by a horn of the form.

FIG. 3 is a perspective view of a package having tape pieces welded by a conventional device.

FIG. 4A and FIG. 4B are views showing another conventional packaging body.

5 is a perspective view of a conventional device showing a horn and an anvil for forming a seal line of a tape piece welded to the package of FIG. 1. FIG.

[Explanation of symbols]

1 ultrasonic horn 2 anvil 3 Seal ridge

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) B65D 75/62 B65D 75/62 Z (72) Inventor Koji Midorikawa Kamatama village, Shinji-gun, Ibaraki 18- 13 Kureha Chemical Industry Co., Ltd., Resin Processing Technology Center (72) Inventor, Yasuhiro Tetsu 18-year-old Kamaritama, Tamari Village, Shinji-gun, Ibaraki Prefecture 13-13 Kureha Chemical Industry Co., Ltd. 18-13 Kamizamari, Tamari-son, Shinji-gun, Kureha Chemical Industry Co., Ltd. F-Term (Reference) 3E067 AA22 AB06 AC01 BA22A BB14A BC03A EA26 EB09 FA01 FC01 3E075 AA28 BA66 BB14 CA01 DE13 GA05 3E094 AA11 CA22 HA08 4F AH54 TA01 TC17 TJ23 TN23 TQ05 TQ13 5D107 AA14 AA15 BB01 FF03 FF08

Claims (3)

[Claims] 1. An ultrasonic horn that cooperates with an anvil to ultrasonically weld an unsealing tape after packaging to a film as a packaging material, for forming a seal line on a tip surface of the horn abutting the anvil. An ultrasonic horn characterized in that a seal ridge portion having at least one ridge is formed. 2. A horn according to claim 1 and an anvil, wherein the tip surface of the anvil that comes into contact with the horn is a flat surface, or knurls are formed on the tip surface. And an ultrasonic welding actuation assembly. 3. The superstructure according to claim 2, wherein the anvil is provided with a suction port for adsorbing and holding the tape at a position corresponding to the outside of the formation region of the seal protrusion of the horn. Sonic welding actuation assembly.