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Preventing Clogging of Small Orifices in Objects Being Coated

IP.com Disclosure Number: IPCOM000078697D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hildenbrand, WW: AUTHOR [+2]

Abstract

A nozzle 3 is coated with a TEFLON* layer 4 (Fig. 2) applied with an air brush, not shown. An orifice 5 is protected from clogging during coating by ejecting air (nitrogen) through orifice 5. The nozzle 3 is held upon fitting 6 by clamps 7 secured by screws 8. Chamber 9 in fitting 6 has an inlet 10 for receiving air under pressure, which passes through outlet 11 communicating with orifice 5 in nozzle 3.

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Preventing Clogging of Small Orifices in Objects Being Coated

A nozzle 3 is coated with a TEFLON* layer 4 (Fig. 2) applied with an air brush, not shown. An orifice 5 is protected from clogging during coating by ejecting air (nitrogen) through orifice 5.

The nozzle 3 is held upon fitting 6 by clamps 7 secured by screws 8.

Chamber 9 in fitting 6 has an inlet 10 for receiving air under pressure, which passes through outlet 11 communicating with orifice 5 in nozzle 3.

TEFLON primer is sprayed onto nozzle 3 while air flows out of it. Then the primer is baked at 450 degrees F, for example. Next, with air flowing out of nozzle 3, the FEP TEFLON coating is air brush sprayed onto the nozzles. Then, the nozzle 3 is baked at 580 degrees F, for example, with air still flowing from the orifice 5, because FEP TEFLON flows when heated to the range of 580 degrees F and would otherwise clog the orifice 5. Air flow continues until nozzle 3 has cooled.

Machining is a less practical solution because rough edges are produced, reducing the accuracy of direction of ejected fluids passing through the nozzle. * Trademark of E. I. du Pont de Nemours & Co.

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