JPH0349868Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a polymer film bonding device used for stacking and welding sheet-like polymer films such as vinyl, polyethylene, and nylon. Therefore, it is particularly useful for the impermeable membrane coating method of the shield method.

[Prior art] In bag making, packaging, etc., polymer films are stacked and welded using ultrasonic waves. In such polymer film bonding equipment, ultrasonic vibrations are applied directly to the polymer film. The voltage is applied using an ultrasonic horn.

[Problems to be solved by the invention] However, in the conventional device, the pressing pressure of the ultrasonic horn is kept constant even when the type of polymer film (material, thickness, etc.) or feeding speed changes. Therefore, there was a problem that a proper welding state could not be obtained.

In view of these circumstances, the present invention is intended to ensure that polymer films can be properly joined even if the type or feed speed of the polymer films to be joined is changed.

[Means for Solving the Problems] The present invention includes an ultrasonic generator and a vibrator, an ultrasonic horn for welding stacked polymer films by ultrasonic waves, and a polymer film feeding device. The welding apparatus continuously welds polymer films by means of a means for adjusting the pressing force of the horn against the polymer film in accordance with the type of polymer film and the feed speed.

[Function] When the type of polymer film or feeding speed is changed, a corresponding pressing force is applied to the horn, and the polymer film is appropriately joined.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes an ultrasonic generator, and the ultrasonic waves generated by the ultrasonic generator 1 are transmitted through an ultrasonic transducer (not shown) housed in an ultrasonic transducer box 3 to an ultrasonic horn. It is now possible to convey this to 4 people. Note that 2 is a balance weight of the horn 4.

Reference numerals 5 and 6 are polymer films, which pass through a feed roller 7, under a horn 4, and are fed to the left in the figure by a feed roller 8. The horn 4 is pressed downward by a fluid pressure cylinder 9, and presses the polymer films 5 and 6 between it and a pedestal 10 provided below, so that the polymer films 5 and 6 are heated by ultrasound. It is designed to be welded together.

In such a configuration, when the polymer films 5 and 6 are being joined while applying a constant pressing pressure to the horn 4 by the cylinder 9, for example, when the polymer films 5 and 6 to be joined next are When the thickness becomes thicker or the feed speed is changed to a higher speed, the pressing force of the cylinder 9 is increased in accordance with the thickness and feed speed. On the other hand, when the thickness of the polymer films 5, 6 becomes thinner or the feeding speed is changed to a slower one, the pressing force of the cylinder 9 is weakened, contrary to the above.

By adjusting the pressing force of the cylinder 9 in this way, the pressing pressure of the horn 4 against the polymer films 5 and 6 is controlled, and the polymer film is given a pressing force from the horn 4 that corresponds to the type and feed speed. A proper bond is made.

In the above embodiment, the fluid pressure cylinder 9 was used as a means for adjusting the pressing pressure, but for example, a plurality of springs with different spring constants or a plurality of weights with different weights may be provided, or other methods of the present invention may be used. Of course, various changes may be made without departing from the gist.

[Effects of the invention] As explained above, according to the invention, the pressing pressure of the horn can be adjusted in accordance with the type of polymer film and the feed speed, so that proper joining can be performed. It can produce excellent effects.

[Brief explanation of the drawing]

The figure is a side view showing an embodiment of the present invention. 1 is an ultrasonic generator, 3 is an ultrasonic transducer box, 4 is an ultrasonic horn, 5 and 6 are polymer films, 8 is a feed roller, and 9 is a fluid pressure cylinder.

Claims (1)

[Scope of utility model registration request] A bonding device for continuously welding polymer films, which includes an ultrasonic generator and a vibrator, an ultrasonic horn for welding stacked polymer films by ultrasonic waves, and a polymer film feeding device, 1. A polymer film bonding apparatus comprising means for adjusting the pressing force of the horn against the polymer film in accordance with the type of polymer film and the feed speed.