Browse Prior Art Database

Noncontact Overspray Protection

IP.com Disclosure Number: IPCOM000083884D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Cavallieri, VJ: AUTHOR [+2]

Abstract

Figs. 1 and 2 depict a substrate 4 blocked together on a common carrier plate 5, to provide side protection from spraying of photoresist or similar coatings upon the top surface of the substrate. The basic premise is shown in Fig. 3.

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Noncontact Overspray Protection

Figs. 1 and 2 depict a substrate 4 blocked together on a common carrier plate 5, to provide side protection from spraying of photoresist or similar coatings upon the top surface of the substrate. The basic premise is shown in Fig. 3.

Typically, most spray guns 7 traverse across the product (substrate) with a resultant spray cone as pictured. The sprayed material, for example photoresist, is emitted from the gun 7 at some pressure P. The substrate rests in a pocket within the carrier with centering fingers 6, as shown in Figs. 1 and 2. The side of the carrier denoted A in Fig. 3, precludes the sprayed material that is emitted at an incident angle in the spray cone from striking the side of the substrate 4 by shadowing technique.

The pressure (P) emitted by the gun 7 builds a back pressure (P1) in the cavity surrounding the substrate 4, preventing sprayed material from entering the cavity in sufficient volume to cause appreciable side buildup. That buildup, which does occur, is uniform on all four sides and from part-to-part. Sticking is virtually nonexistent with the possible exception of where the centering fingers 6 contact the substrate 4.

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