Detection of improper coating of sealing composition on can end

Details Detection of improper coating of sealing composition on can end Detection of improper coating of sealing composition on can end

1983-10-25

1985-02-12

Morgenstern, Norman

Coating apparatus

With indicating, testing, inspecting, or measuring means

118670, 118318, 118409, 427 10, B05C 302, B05B 1306

Patent

active

044984154

ABSTRACT:
Can end disks have annular, curled rims on which a sealing composition is applied as a coat to form airtight seals when the end disks are subsequently attached to can bodies. The sealing composition is sprayed onto the curled rim of each can end disk by an overlying spray nozzle while the disk is being rotated on a rotary rest in a coating machine. For detecting uncoated regions on the curled rim of the can end disk, a photodetector is positioned over the rim of the disk on the rotary rest, with a preassigned angular spacing between the photodetector and the spray nozzle. The detection of uncoated regions is essentially concurrent with the application of the sealing composition. Since the output from the photodetector represents a nonfaulty uncoated region (i.e. a region not yet coated), in addition to a possible faulty uncoated region (i.e. a region accidentally left uncoated), a signal generator such as a proximity detector is provided for invalidating the photodetector output portion representative of the nonfaulty uncoated region. Any can end disk having a faulty uncoated region is rejected while being subsequently conveyed toward the next processing station.

REFERENCES:
patent: 2795818 (1957-06-01), Bertorello et al.
patent: 3396698 (1968-08-01), Alholm et al.
patent: 3898954 (1975-08-01), Galitz

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