JPH0585526A - Ultrasonic welding device for film - Google Patents

Abstract

PURPOSE:To provide an ultrasonic welding device for film having high welding strength, which realizes a simultaneous cutting of outside of a welding part. CONSTITUTION:An ultrasonic welding device for film has a flat horn 1 which has a flat surface 1a at a tip end and forms a main parts of the device. The device also has an anvil roller 2 which has a protruding part on an outermost peripheral part 2a to be rotated compulsorily and slanted surfaces 2b and 2c between the outermost peripheral part 2a and an upper and a lower surface. In this constitution, two films 5 are sandwiched forcingly and moved successively between the flat horn 1 and the anvil roller 2, so that the film 5 is welded. In this instance, the protruding part of the outermost peripheral part 2a of the anvil roller 2 and the flat surface 1a at the tip end of the flat horn 1 are brought into contact with each other through a doubling part of the film 5, and then the doubling part of the film 5 is welded, and at the same time, an extra reamaining part 6 is cut down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film ultrasonic welding apparatus, and more particularly to a film ultrasonic welding apparatus for welding a film opening in a heat shrinkable film article, for example, a battery packaging.

[0002]

2. Description of the Related Art Recently, as a packaging form of dry batteries, a plurality of batteries as one unit are packaged with a heat-shrinkable film, and are often supplied to the market.

Conventionally, this kind of film ultrasonic welding apparatus has a flat roller 1 having a flat contact surface as shown in FIG.
1 and a round welding horn 10 having a flat contact portion with the film 12 at the front end, which is the main part of the ultrasonic welding device, and having a roundness in the traveling direction of the film 12, the battery 7 is placed inside. Film 1 folded in two along the length
Linear welding has been performed by continuously moving 2.

[0004]

However, it is difficult to maintain the shape of the tip portion of the R welding horn 10 constant by the welding of the film by the ultrasonic welding device, and as a result, the welding strength between the films is low and there are variations. The film 12 was a cause of damage from the welded portion.

Further, the processing of the shape of the tip of the R-welding horn is a complicated three-dimensional processing, and it is difficult to obtain consistency and it is difficult to set the R-welding horn 10 and the flat roller 11.

The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide an ultrasonic welding apparatus for a film, which has a high welding strength and is capable of simultaneously cutting the film outside the welding portion.

[0007]

In order to solve this problem, an ultrasonic welding device for a film according to the present invention comprises a flat horn, which is a main component of the ultrasonic welding device having a flat surface at the tip, and a forced horn. An outer peripheral part is provided with a convex part, an outermost peripheral part and an anvil roller having an inclined surface between an upper surface and a lower surface are provided, and two films are provided between the flat horn and the anvil roller. In a device for continuously moving the clamping pressure to weld the film, the convex portion of the outermost peripheral portion of the anvil roller and the flat surface of the tip of the flat horn are contacted via the overlapping portion of the film, The overlapping portion of this film is linearly welded, and at the same time, the surplus remaining portion is cut.

[0008]

The two films are sandwiched and continuously moved between the flat surface of the tip of the flat horn and the convex portion of the outermost peripheral portion of the anvil roller, and the overlapping portions of the films are ultrasonically welded to each other. The front end of the two films can be welded and cut at the same time. If the contact area between the anvil roller and the flat horn is increased due to mutual wear, polishing the anvil roller and changing the contact position by rotating the flat horn will make it possible to reproduce the same conditions. It is easily possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film ultrasonic welding apparatus according to an embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, the anvil roller 2 is driven by a timing belt 4 via a timing pulley 3. Outermost part (projection) 2 of the anvil roller 2
a and the flat surface portion 1a at the tip of the flat horn 1 contact the film 5 under pressure. The outermost peripheral portion (convex portion) 2a of the anvil roller 2 and the flat surface 1a of the flat horn 1.
At the contact portion of the film 5 and the battery 7 running on the base 8, the film 5 is continuously moved under high pressure, and the open end of the film 5 is welded and cut. The film 5 is sent to the post-process together with the battery 7, and the surplus remaining film 6 is also wound up in another part.

In FIG. 2, inclined surfaces 2 are provided on the upper and lower surfaces.
The anvil roller 2 provided with b and 2c has the convex portion on the outermost peripheral portion 2a as described above, and the angle θ formed by the upper slope 2b and the vertical direction is preferably 30 ° to 45 °. The tip of the outermost peripheral portion 2a is rounded to 0.3. By the rounded portion and the flat horn 1 that vibrates ultrasonically, the two films at the open end are simultaneously welded and cut. The relative position of the flat horn 1 in contact with the anvil roller 2 is arbitrary as long as it is on the circular flat surface 1a at the tip.

Further, when the contact area between the anvil roller 2 and the flat horn 1 is increased due to mutual wear, the anvil roller 2 is polished and the contact position is changed by rotating the flat horn 1. This makes it possible to reproduce the same conditions extremely easily.

[0013]

As is apparent from the above description of the embodiments, according to the ultrasonic welding apparatus for a film of the present invention, the strength of the welded portion can be increased, and the tensile strength for breaking the welded portion is the conventional one. The ratio was 1.5 to 2 times, and at the same time, the strength variation width was also reduced to about 1/2.

Further, since the film can be simultaneously cut by welding, an additional device for cutting the film is unnecessary.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a main part of an ultrasonic welding apparatus for a film according to an embodiment of the present invention.

FIG. 2 is a side view showing a positional relationship between an anvil roller and a flat horn and a main part in a state where a film opening is welded.

FIG. 3 is a perspective view showing a configuration of a main part of a conventional film ultrasonic welding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat horn 1a Flat surface 2 Anvil roller 2a Outermost peripheral part (convex part) 2b Upper slope (sloping surface) 5 Film 6 Excessive residual film (excessive residual part) 7 Battery

Claims (1)

[Claims] 1. A flat horn, which is a main component of an ultrasonic welding apparatus having a flat surface at its tip, and a convex portion at the outermost peripheral portion that is forcibly rotated, and is provided between the outermost peripheral portion and the upper and lower surfaces. An anvil roller having an inclined surface, wherein the flat horn and the anvil roller are continuously moved by a pressing force between two films to weld the films, and the outermost periphery of the anvil roller is provided. The convex part of the part and the flat surface of the tip of the flat horn,
An ultrasonic welding device for a film, which abuts via an overlapping portion of the film, and linearly welds the overlapping portion of the film, and at the same time, cuts an excessive remaining portion.