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Web Handling & Electrostatic Converting

Bag-Making: Achieving the Perfect Bag Count

After high and low-density resins have been blended together, heated and blown overhead, the resulting film is sent through a series of rollers to lay it flat and wind it onto large cores. These large cores are sent to converters to create plastic bags.  Converters take the film and cut it to size using hot knives that also seam the sides of the bag. 

Problem:

With varying bag sizes, machine cycle speeds may produce anywhere from 2,000 bags per hour for larger bags and 70,000 bags per hour for smaller bags. When running at such high speeds, it can be difficult for bag manufactures to ensure accurate bag counts

Solution:

The PD-22 Perforation Detector incorporates a high resolution and clean signal reducing interference for accurate counts. It is an adjustable output, DC high voltage power supply designed for use with Simco-Ion’s EL10 Perforation Detecting Probe.  Because of its compact size, the PD-22 is well suited for machinery environments where operating clearance are greatly limited.  Its low weight and shock resistance allow it to be mounted directly to a gantry or robot arm in automated perforation detection processes.

By placing the EL-10 facing a ground roller, the PD-22 shoots a high voltage stream at the moving web of bags.  Each time a perforation is exposed to the area where the probe is facing, the charge is able to penetrate the perforation to the grounded surface.  Each time the charge is able to penetrate, the perforation detector counts a perforation. 

By setting the perforation detector to a specific number, bag manufacturers can accurately count perforations allowing for production machines to cut bags and drop them into a box.