Plastic films and the equipment to make them have been around for some time with few significant changes. Whether processed as blown or tentered film, at some point after the orientation is complete, some equipment is used to measure the film thickness. The simplest gauges just measure the overall thickness, while more sophisticated equipment such as is disclosed here, can measure one or more individual layers in a multilayer film. Regardless of the equipment used, they all suffer from a common problem: the equipment only examines a small spot on the film. In an attempt to cover the entire width of the film to look for side-to-side variations, the equipment moves back and forth across the width of the film to look . While this initially seems to be satisfactory, the equipment is only still only examining small section of the film. Let me show this with a picture:
The situation would be much improved if the scanner would examine the full width of the film at the same time. Then the area examined would simply be determined by the measurement time and the film speed.
These problems are widely known in the film industry, so if someone had AFFORDABLE equipment to scan the entire width of a film at once, they would be certain to mention it in their press release. Keep in mind that some film operations can produce films that are 8 meters wide, so this is not a small challenge.
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