Automatic inspection apparatus detects flaws in heat seals between films of polyethylene or other thermoplastic material. Heat-sealed strip in multilayer plastic sheet continuously moved lengthwise over illuminators. Variations in light transmitted through sheet interpreted to find flaws in heat seal. Site of flaw marked to facilitate subsequent manual inspection. Heat sealing used to join plastic films in manufacturing of variety of products, including inflatable toys and balloons carrying scientific instruments to high altitudes.
Automatic Inspection Of Heat Seals Between Plastic Sheets
NASA Tech Briefs ; 19 , 1
1995-01-01
Miscellaneous
No indication
English
Automatic Inspection of Heat Seals Between Plastic Sheets
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