IPA Use For Additive Manufacturing Post Processing Resin Removal
Generally, manufacturers of 3D printer resins recommend the use of isopropyl alcohol (IPA) as the solvent for post-processing removal of uncured resin from printed components. However, this process can be challenging due to IPA’s properties. IPA possesses a flashpoint below ambient temperature, posing a risk of ignition in the presence of vapors, and necessitates specialized storage solutions. Residual IPA absorption by cured resin can lead to deformation or warping of parts over extended exposure, especially at elevated temperatures. Consequently, optimizing exposure duration and temperature is critical. Alternatives solvents exhibit lower efficacy, often requiring aqueous rinses after resin removal, which increases waste volume, prolongs drying times, and incurs higher operational costs.
The VCN (Vacuum Cycling Nucleation) process addresses these issues through initial processing within a controlled nitrogen environment, effectively eliminating entrapped air prior to IPA contact. The fully automated VCN apparatus utilizes heated IPA to facilitate rapid, thorough removal of uncured resin, minimizing component exposure and reducing the risk of damage. Typical process durations as short as 15 seconds are sufficient for complete resin removal from field units. When longer cleaning intervals are necessary, IPA temperature is regulated to near ambient conditions to prevent thermal stress. The VCN process employs gentle vapor expansion rather than pressure buildup, ensuring a non-invasive cleaning cycle that induces internal fluid circulation within the part, thereby enhancing resin removal efficiency and preserving part integrity.
The above-referenced video demonstrates an IPA (isopropyl alcohol) unit designed to clean resin in under one minute. This system features a dedicated distillation unit enabling continuous use of purified IPA for each cycle. All units are equipped with vacuum distillation and vacuum drying capabilities. The enclosed “airless” process efficiently recycles all IPA and produces a clean, dry part in less than five minutes. Minimal waste is generated from still bottoms, and due to the limited amount of IPA required, onsite replacement is infrequent. Please contact us if you are experiencing issues with IPA management.