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Pressure Vacuum Coating Device

IP.com Disclosure Number: IPCOM000094623D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Howard, WM: AUTHOR [+2]

Abstract

This device is for coating a workpiece such as the printed circuit board 1. It has a sealed reservoir 2 with multiple attached nozzles 3, only two of which are shown for sake of clarity. An aspirator system is connected to reservoir 2 and a T-shaped venturi constricted hollow member 4. Valves A and B are operatively connected to the rotary solenoids 5 and 6, respectively. Valves A and B are mounted at one end of the horizontal channel of member 4, the other end being connected to an air pressure system, not shown.

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Pressure Vacuum Coating Device

This device is for coating a workpiece such as the printed circuit board 1. It has a sealed reservoir 2 with multiple attached nozzles 3, only two of which are shown for sake of clarity. An aspirator system is connected to reservoir 2 and a T-shaped venturi constricted hollow member 4. Valves A and B are operatively connected to the rotary solenoids 5 and 6, respectively. Valves A and B are mounted at one end of the horizontal channel of member 4, the other end being connected to an air pressure system, not shown.

In operation, valves A and B are first opened. As a result, the air is channeled horizontally through the venturi constriction thereby creating a partial vacuum in reservoir 2. During this period, the device is cycled so the coating fluid 7 is fed into reservoir 2 from a supply, not shown, by a valve and duct system, not shown. As a result of reservoir 2 being maintained in this partial vacuum, fluid 7 is prevented from dripping or leaking out of nozzles 3.

To coat board 1, valves A and B are closed by actuation of solenoids 5 and 6, causing the air from the pressure system to be directed downward to expel fluid 7 from nozzles 3. The device is further cycled so that when flow of fluid 7 being discharged from nozzles 3 is to be cut off, valves A and B are rapidly opened by solenoids 5 and 6 thus again establishing the partial vacuum in reservoir 2. Hence, the discharge is rapidly cut off and fluid 7 is thus prevented from d...