1 / 15

Cleaning Process Options

Learn about solvent selection, cleaning benefits, and technologies for effective product surface preparation. Compare and evaluate various cleaning options to meet industry standards and specifications.

awalsh
Download Presentation

Cleaning Process Options

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cleaning Process Options Solvent Selection

  2. Why do we Clean? • We clean to ensure product reliability • remove ionic / acidic contamination and particulates that can cause problems in use of the product • We clean to prepare surfaces • remove oils and flux residues that can inhibit the bonding of conformal coatings / insulation coatings • remove flux residue from underfill areas • prepare surfaces for bonding or coating • We clean to meet specification requirements • because it is in the contract

  3. Was No-Clean technology developed by Military Intelligence? The phrase “No-Clean” is incorrect. These types of fluxes and pastes correctly should be referred to as “Synthetic” Fluxes Many “Synthetic” fluxes and pastes are cleaned Steve Stach / AAT

  4. No-Clean Fluxes really are Synthetic Fluxes • Traditional fluxes are limited • Rosin fluxes must contain rosin • Inherently sticky • not as printable for Fine Pitch • Water solubles must be water soluble • Shorter printing life, less tack • harder to process -must be cleaned • Synthetic Fluxes have no formulary restrictions • Can be formulated to optimize the process • Printability, tack, printing life, cleaning or no clean Steve Stach / AAT

  5. Flip Chip cleaning prior to under-fill improves reliability by preventing under-fill voids and delamination Delamination of under-fill will cause premature solder failure Under-fill Void traps foreign matter and concentrates physical force Steve Stach AAT

  6. Lead free soldering requires stronger fluxes/cleaning or nitrogen oven inertion No-lead residues are discolored due to higher temperature profiles

  7. Vapor Degreasing LENIUM GS, 3M HFEs Aqueous ALPHA 2110 HYDREX SP / SP-50 KYZEN 4520 ZESTRON AC200 Semi-Aqueous BIOACT EC-7R AXAREL 32 / 36 / 46 BIOACT SC-22 Types of Cleaning Options Evaporative Solvents IPA, Acetone, MEGASOLV JB, AXAREL 2200

  8. Cleaning Technologies with Differing Benefit Trade-offs • Aqueous Cleaning • Evaporative Solvent Cleaning • Semi-aqueous Cleaning • Vapor Degreasing • Out-Sourced Cleaning

  9. Cleaning Options • Aqueous • Water Wash with Water Rinse • Semi-Aqueous • Hydrocarbon Wash / Water Rinse • Vapor Degreasing • Heated Solvent Vapor Wash and Rinse • Evaporative Solvents • Hydrocarbon Wash and Rinse • Contract Cleaning • Contractor Responsible for Part Cleaning

  10. Cleaning Trade-offs

  11. Aqueous Cleaning • Advantages • Low VOCs • Cleans Most Contamination • Chemicals Inexpensive • Equipment low to Moderately Expensive • Short process cycle - inline • Disadvantages • Wastewater Treatment / Neutralization • High Energy Cost • Medium to Long Process Cycle - Batch • Government Restrictions on Water Use

  12. Evaporative Solvents • Advantages • Easy to use • Chemicals Relatively Inexpensive • Process Time Under 20 minutes • Good for Cleaning Stencils / CCAs / Misprints • Disadvantages • High VOC Content • Safety concern, Flammable/combustible • Waste Disposal • Can just move dirt around

  13. Semi-Aqueous Cleaning • Advantages • High VOCs, but Low Evaporation • Cleans Most Contamination • Chemicals Moderately Expensive • Many Products are Biodegradable • Disadvantages • Moderate Energy Cost • Medium to Long Process Cycle • Good Machines Are Expensive

  14. Vapor Degreasing • Advantages • Solvent is Continuously Recycled • Cleans Most Organic Contamination • Process Time Under 10 Minutes • Excellent for Cleaning Fine Pitch / BGAs / Blind Holes / Machined Parts • Disadvantages • Not so good for polar soils • Low to Moderate Energy Cost • Chemicals Must Be Handled Carefully • Chemicals Expensive & volitile • Systems can can become acidic with water contamination • VOC issues

  15. Contract Cleaning • Advantages • Contract Professional Manages the Cleaning Process • No Chemicals to Buy; No Maintenance • No Permits to Meet • No Equipment to Purchase • Disadvantages • Not many

More Related