Bernal offers a variety of stripping methods to remove both continuous scrap and island scrap without sacrificing speed or precision. In-tool stripping features a pin mounted in the lower tool to skewer the scrap, and a stripping comb mounted to a rigid assembly to lift the scrap off the pin, which is then vacuumed away. We also provide outboard stripping, in which the stripping pins (which may be fixed or retractable) are housed in a separate cylinder and in a separate station.
Stripping is a method of separating the scrap (waste) from the web and removing it for recycling or disposal. The stripping procedure typically includes the use of stripping pins mounted into the lower die and scrap removing combs. Stripping pins are spiked shaped screws that can come in a variety of shaped barbed ends. They are used to pierce the web in the scrap areas and separate it from the main carton and follow the lower die until removed by the scrap comb. Scrap combs act as a mechanical device to release the held scrap from the stripping pins and eject it into the scrap chute.
Caution should be observed when operating dies with stripping pins and combs. Combs are setup with a minimum clearance to the die (0.001) to increase scrap removal efficiency. This tight clearance could cause a collision with the blades on the lower die, loosened stripping pin, etc. Improper side alignment with comb could cause pin scuffing or broken pins.