| 摘要 |
Method and apparatus for producing holes, slits, cuts or the like in flexible materials such as films of polyethylene, polypropylene, laminates and coextrusions with reduced noise using a controlled pulse of compressed air to activate a vented pneumatic cylinder which incorporates the cutting element into the cylinder by integrating it into the plunger. The unit is activated by pulsing an electric solenoid valve controlling a supply of compressed air of a known pressure to move the plunger/cutting tool. The body of the pneumatic cylinder is vented at a known position relative to the overall stroke of the plunger to relieve the pressure without an exhaust at the driving air admission end. This allows control of the plunger stroke to pass the cutting tool through the material to be cut without having to physically restrict the length of plunger stroke. Because the stroke is controlled in this manner, the plunger start and stop position can be maintained without physical contact with the ends of the cylinder body. This eliminates the noise ordinarily associated with these types of systems. |
