JPH0351142Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a polymer film bonding inspection device used when stacking and welding sheet-like polymer films such as vinyl, polyethylene, and nylon. This is especially 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 this type of welding of polymer films, once the material and thickness of the polymer film is determined, the polymer film is welded using ultrasonic waves while being fed at a constant speed according to the material and thickness. However, no equipment for inspecting the bonding state of polymer films had been developed.

[Problems that the invention aims to solve] Even if the polymer film is fed and welded at a constant speed depending on the material and thickness of the polymer film, changes occur in the welded state of the polymer film due to various factors. Sometimes. As a result, the polymer film sometimes melts and has holes, is not sufficiently welded, and the purpose of joining cannot be achieved.

The present invention attempts to inspect whether polymer films have been properly bonded.

[Means for Solving the Problems] The polymer film bonding inspection device of the present invention is an apparatus for welding and bonding polymer films using ultrasonic waves, etc., and includes an optical sensor at least at a downstream position above and downstream of the weld bond. and a comparison device that compares the signal from the downstream optical sensor with the signal before bonding.

[Operation] Therefore, the signal from the downstream optical sensor and the signal before bonding are compared by the comparator, and the bonding state is inspected based on the difference in light transmittance.

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

In the figure, 1 is an ultrasonic generator, and the ultrasonic waves generated by this ultrasonic generator 1 are transmitted to a horn 4 through an ultrasonic transducer (not shown) housed in an ultrasonic transducer box 3. It is becoming possible to convey the message. 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 spring 9, and the polymer films 5 and 6 are pressed against a pedestal 10 provided below, and the polymer films 5 and 6 are welded together by ultrasonic waves. I'm starting to do that.

In such a joining device, optical sensors 13a and 13b, each consisting of a light emitter 11 and a light receiver 12, are installed at a position above and downstream of the welded joint, that is, the horn 4 and the pedestal 10, so as to sandwich the polymer films 5 and 6. A comparator amplifier 14 is provided which is arranged and compares the signals from the optical sensors 13a, 13b.

Now, the polymer films 5 and 6 fed out by the feeding rollers 7 and 7 are joined by the horn 4 while being sent to the left in the figure by the feeding rollers 8 and 8.
At this time, the optical sensor 1 is located above and downstream of the horn 4.
3a and 13b transmit light, and the transmittance of each is compared by a comparison amplifier 14. Since there is a difference in light transmittance between the polymer films 5 and 6 before and after bonding, that is, the transparency of the polymer films 5 and 6 increases after welding, so if the difference in transmittance exceeds a certain level, it is determined that the polymer films 5 and 6 have been welded. It can be seen that if it is below a certain level, there is poor welding. If a welding failure occurs, control is performed to adjust the pressing force of the horn 4 and the amount of ultrasonic vibration applied.

In the above embodiment, the optical sensors 13a and 13b were arranged above and downstream of the welded joint, but if the transmittance data before joining is recorded in advance in the comparator amplifier 14, microcomputer, etc., the upstream optical sensor 13a, can be omitted. Furthermore, in order to make the difference in transmittance more clear, the bonding surfaces of the polymer films 5 and 6 may be made matte or coated with a color.

[Effects of the invention] As explained above, the polymer film bonding inspection device of the present invention can easily and reliably detect the bonding state of polymer films based on the difference in light transmittance before and after bonding. It can produce excellent effects.

[Brief explanation of the drawing]

The figure is a side view of one embodiment of the present invention. 1 is an ultrasonic generator, 4 is a horn, 5 and 6 are polymer films, 13a and 13b are optical sensors, 14
indicates a comparison amplifier.

Claims (1)

[Scope of utility model registration request] A joining device that welds and joins polymer films using ultrasonic waves, etc., which has an optical sensor located downstream of the welded joint, and is equipped with a comparison device that compares the signal from the optical sensor with the signal before joining. A polymer film bonding inspection device featuring: