Browse Prior Art Database

Uralane Coating Masking Tool

IP.com Disclosure Number: IPCOM000102820D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Chan, WR: AUTHOR [+2]

Abstract

A masking tool was designed to prevent conformal coating material from penetrating the electrical contact area of the AMP connector during the uralane coating process. Uralane is a two-component urethane conformal coating which is used to protect the printed circuit board against moisture and ionic contamination. Uralane has excellent electrical insulation properties and a thin film of few angstroms may prevent electrical connection. Therefore, in areas on an assembly page such as connector pins (see sketch), the existence of this coating is not permissible.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 84% of the total text.

Uralane Coating Masking Tool

      A masking tool was designed to prevent conformal coating
material from penetrating the electrical contact area of the AMP
connector during the uralane coating process.  Uralane is a
two-component urethane conformal coating which is used to protect the
printed circuit board against moisture and ionic contamination.
Uralane has excellent electrical insulation properties and a thin
film of few angstroms may prevent electrical connection. Therefore,
in areas on an assembly page such as connector pins (see sketch), the
existence of this coating is not permissible.

      Besides being labor intensive, hand masking operations on this
type of connector are not 100 percent reliable because an opening
exists where the contact (solder) end tails emerge from the connector
body.  Any leaks from masking tape could result in uralane coating
wicking into the connector during the vacuum de-air cycle of the
conformal coating process.  This tool was developed to avoid such
imperfections which require a highly skilled operation.

      The tool that was developed mainly consists of an upper body
(1), a lower body (2) and strips of silicon rubber (3). In the sample
tool shown, the rubber strips conform to the contours of the circuit
board and the frame of the assembly around the connector area.
Therefore, when the assembly is "sandwiched" by actuating the toggle
clamp (4), the connector (with the pins) will be sealed and kept free
of coating du...