Process for masking sheet metal for chemical milling

Details Process for masking sheet metal for chemical milling Process for masking sheet metal for chemical milling

1977-10-27

1979-05-22

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156241, 156249, 156253, 156634, 156644, 156656, 156659, 156660, 156661, C23F 102

Patent

active

041558014

ABSTRACT:
This process comprises the steps of depositing a suitable maskant which is resistant to the chemicals used in chem-milling on a back-up sheet such as thin plastic, punching or cutting the desired pattern to be removed from the sheet metal through the maskant and the back-up sheet, then applying the maskant by adhering the same to the sheet metal surface with the plastic back-up sheet on the outside surface. The back-up sheet/maskant combination is placed on both sides of the sheet metal where the thickness of the sheet metal requires chem-milling from both surfaces. For thin metal, one surface of the material can be directly coated with the maskant while the other surface employs the back-up sheet/maskant combination. After the adhesive operation, the plastic back-up sheet is then removed from the maskant and the sheet metal, with the maskant then remaining on the sheet metal, the sheet metal is then deposited in an appropriate chem-mill solution and the openings through the maskant material are caused to be etched away, the maskant is then removed from the finished sheet metal.

REFERENCES:
patent: 3415699 (1968-12-01), Brown
patent: 3718473 (1973-02-01), Gervay et al.
patent: 4054483 (1977-10-01), Peiffer

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