High Pressure Sprays
- High-pressure spray is very effective at particle removal and excellent for cleaning blind, tapped holes.
- High-pressure spray cleaning may use any of the following chemistries:
- High-pressure sprays are probably not necessary for lower cleanliness levels. For example, the removal of machining chips does not require high pressure; however, the removal of lapping compounds might.
- Nozzle design greatly influences process efficiency. Nozzle design range from fan jet to needle jet.
- A basic cleaning system consists of:
- Liquid supply
- Supply pump with filter
- High-pressure pump with filter
- Spray wand (removable nozzles increases adaptability)
- Tank or booth (use of a glove box is common).
- Any chemical additive must have very low foaming properties.
- Process optimization involves:
- Nozzle design
- Nozzle configuration within spray header (spray pattern)
- Impingement angle
- Cleaning liquid chemistry
- Pressure (flow rate)
- Dwell time.
- Redeposition of contaminant from spray bounce-back may be a problem.
- High-pressure spraying can achieve all levels of cleanliness. The cleanliness level required will dictate cleaning system filter requirements.
- High-pressure spraying can be done with a manual spray wand or an automated spray header.
- It may be used alone or as part of a system combining other process steps.
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All SAGE material, Copyright© 1992,
Research Triangle Institute
23 May 2001