Micro‐precision sandblasting is a proven process for removing various types of contamination without damaging the leads or traces on the devices. In some cases, simply removing foreign material is sufficient to restore the board to a functional state. 

Cleaning of a contaminated board is best performed by a manual blasting system with an enclosed workstation that confines the spent abrasive and provides a high visibility work area for the operator. The workstation should be equipped with static-dissipative devices to reduce the potential for static charge damage.

A Versatile Tool

MicroBlasting offers a cost-effective solution to many of the problems encountered when trying to salvage and recycle printed circuit boards.  In addition to the selective cleaning example used in this overview, microblasting is used to remove conformal coatings from PC boards, trim epoxy from probe rings and for demarking electronics packages.

Removing contamination from set-top pc boards

Contamination Removal from Set-Top PC Boards

When cable TV converter boxes or “Set‐Tops” fail, the high value of the boards and boxes warrants a significant effort to salvage these products. From coffee or soda to pet hair, contamination is often the source of a short or malfunction to the board. In order to recycle the returned board, it must be cleaned of all foreign substances and tested.

MicroBlasting is a fast, environmentally friendly, and cost‐effective solution to the problem of cleaning PC boards without causing damage to the board circuitry. It works by propelling air and abrasive out a small nozzle. The high velocity of the particles as they exit the nozzle greatly increases their abrasive action. 

PC set-top board with contamination

Board with contamination

PC set-top board after cleaning with MicroBlasting

Board, after removing contamination with MicroBlasting

What You Need to Get Started

Equipment: A manual system designed for static-sensitive applications. In this case: the AccuFlo® micro-precision blaster and the ProCenter Plus™ with ESD Control. (see below)

Media: 50-micron glass bead; removes residue without damaging components and or traces

Nozzle: 0.046” ID round nozzle; recommended for large, even coverage over the entire board

Nozzle Distance: 3-5” from the board

Blast Pressure: 60-80 psi

How to Clean with MicroBlasting

The operator should hold the nozzle a few inches from the board so that there is only light abrasion of the surface. Because of the small size of the nozzle opening, the operator can direct the abrasive stream with pinpoint accuracy and only blast sections of the board that are contaminated with foreign material.

The blasting process needs to be an even, controlled motion across the surface of the board. Care should be taken not to focus on any one section too long. If sprayed in one location long enough, the abrasive will start to damage the board. Once the board is clean, use an air gun to blown off any residual abrasive media.

Due to the variety of contamination types and levels of residue build-up, it may take anywhere from 15 to 45 seconds to process a board.

The ProCenter Plus™ with ESD Control

Any components that are sensitive to electrostatic should be processed in the ProCenter Plus™ with ESD Control. This unit delivers maximum protection against an ESD event.

What is the ProCenter Plus?

The ProCenter Plus is everything necessary to a MicroBlasting system except the blaster. It is a compact, chair-height workstation with an integrated dust collection system and an attached air dryer. It confines the blast area while a built‐in HEPA‐equipped dust collector extracts spent abrasive. It is easy to use and easy to maintain. The ProCenter Plus partners best with the AccuFlo® to form a complete manual MicroBlasting system.

The ProCenter Plus with ESD control has additional features that collaboratively neutralize surface charges and reduce electrostatic build-up.

CTR201- The ESD Control ProCenter Plus and the AccuFlo blaster

Features that Neutralize ESD

Ionizer Bar on ESD Control ProCenter Plus

The Ionizer Bar

Floods the entire work chamber with ionized air to neutralize static build-up. Built-in sensors monitor the effectiveness of the ion flow and indicator lights alert the operator to any changes in operation.

Grounded handpiece on ESD Control ProCenter Plus

Grounded Handpiece

Works with the conductive nozzle to provide a conduit for static, sending it straight to the grounding jacks instead of onto a PCB.

Conductive Nozzle on ESD Control ProCenter Plus

CONDUCTIVE NOZZLE

Limits the potential for a charge to travel to the board from the abrasive hose. A conductive nozzle also blocks a charge that could arc from the operator. Should be used with the grounded handpiece.
Grounding jacks on ESD Control ProCenter Plus

Grounding Jacks

Provide convenient connection points for a wrist-stat, the edge grounding bar, and the needle probe.

Grounding Bar on ESD Control ProCenter Plus

EDGE CONNECTOR GROUNDING BAR

Grounds all edge pins on boards that have edge connectors. This bar is made of conductive rubber material and connects to a grounding jack on the floor of the ProCenter Plus.

Needle probe on ESD Control ProCenter Plus

NEEDLE PROBE

Pierces through the coating and grounds a target trace when the defect is known to be an open trace with no conductive path to ground.

Blacklight on ESD Control ProCenter Plus

BLACKLIGHT

Installed for coatings that are more easily visible under ultra-violet lighting.

CTR201 Specifications

Models: CTR201-1
CTR201-2
Available in: 115V / 60Hz, 4 amp
230V / 50Hz, 4 amp
Dimensions:30" wide x 46" high x 34" deep
Weight:180 lbs (approx.)
Interior Space:2.2 cubic feet, 24" wide x 10" high x 14" deep
Window:Tempered glass opening (hinged) 23" x 11"
Lighting:18W black fluorescent lights (2)
Optional: 40W cool fluorescent lamp
Air Flow: 500 SCFM
Filter:HEPA-99.97% efficiency on 0.3 micron-sized particles
Filter Area:30 square feet
Inlet Air Pressure:80 psi air supply of 10 SCFM in additional to normal blaster supply

Upcoming Events

There are no upcoming events at this time.