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Browse Prior Art Database

Floor Bar in Horizontal Cleaning Equipment for Circuit Boards

IP.com Disclosure Number: IPCOM000104951D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Kilthau, HD: AUTHOR

Abstract

Suitability positioned exit slots ensure a quasi-enclosed system between the flood bar and the horizontally transported circuit board. As a result, the cleaning agent is applied at uniform pressure to any point of the field surrounded by the slots.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 80% of the total text.

Floor Bar in Horizontal Cleaning Equipment for Circuit Boards

      Suitability positioned exit slots ensure a quasi-enclosed
system between the flood bar and the horizontally transported circuit
board.  As a result, the cleaning agent is applied at uniform
pressure to any point of the field surrounded by the slots.

      For cleaning the holes of circuits boards, a slot-shaped jet,
known as flood bar, is used.  To ensure an adequate flow of the
cleaning agent in the holes, the spacing between the circuit board
and the flood bar has to be accurately controlled down to 0.1 and 0.2
mm.  This involves considerable expense in design and material both
for the flood and the transport system.

      As the typical operating temperatures range from 60 to
80ºC, alignment at room temperature tends to be extremely
problematical, since event the slightest misalignment impairs the
flow of the cleaning agent in the holes and the transport of the
board through the equipment.

      Compared with the prior-art means, the flood bar described in
this article has two parallel slots or is designed as a rectangularly
shaped enclosed slot.  This ensures a uniform pressure in the area
surrounded by the slot(s) and an adequate flow of the cleaning agent
in the holes.  The pressure is solely dependent on the exit speed of
the cleaning agent from the flood bar and is readily controllable by
adapting the bar's exit cross-section and the output power of the
circulating pump to e...