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Dispensing Viscous Curable Liquids in Measured Amounts

IP.com Disclosure Number: IPCOM000093384D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Bromberg, M: AUTHOR [+2]

Abstract

This apparatus delivers measured amounts of curable liquid material to the interior surfaces of stacked modules.

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Dispensing Viscous Curable Liquids in Measured Amounts

This apparatus delivers measured amounts of curable liquid material to the interior surfaces of stacked modules.

In the manufacture of stacked electronic modules, it is desirable to apply an encapsulating coating of silicone gel 23 over the circuitry on the top surface of lower substrate 12 of module 10 shown at A. The handling of the uncured liquid gel as well as delivery in precise measured amounts to the relatively inaccessible locations on the module present problems. The liquid gel must be delivered between substrates 11 and 12 in which the clearance is on the order of .058 to
.080 inches without allowing the gel to flow over the side edges.

Apparatus 20 has conduit 21 connected to a source of fluid under pressure. Fluid is transported through pinch tube type valve 22 to needles 23 positioned between substrates 11 and 12 of module 10 supported on carrier 15. Valve 22 consists of flexible tubes 24 seated in arcuate grooves 25 in base 26. Pinch rod 27, positioned transverse to groove 25 and actuated by cylinder 28 provided with a suitable time control not shown, opens and closes tubes 24.

In order to provide complete closure of tubes 24 and insure a reasonable work life, the diameter of pinch rod 27 must be two or more times the inside diameter of tubing 24.

In operation, needles 23 extend about two thirds across the width of the substrate. Silicone gel is dispensed using a time and pressure control to obt...