![]() The precipitation from the dispersion of byproduct NH 4Cl after water removal, and insoluble surfactant DiDAB after dilution with pure decane, is confirmed by X-ray diffraction (XRD). ![]() Transmission electron microscopy (TEM) characterization shows that the ZrO 2 and Fe 2O 3 precursor nanoparticles are both nonagglomerated, spherical, and have a narrow particle size distribution, centered at 4 nm in diameter. A purification process is conducted to remove the precipitation reaction byproduct and excess surfactants from the nanoparticle dispersions. Excess water is removed by azeotropic distillation, and steric stabilization of the particles in the remaining oil medium is achieved with poly(octadecyl methacrylate) (PODMA), initially present dissolved in the oil phase. After mixing of the two emulsions, individual precursor particles are formed by precipitation in the confinement of the aqueous solution droplets. This method starts with preparing two thermostable water-in-oil (w/o) emulsions with nonylphenol tetra(ethylene glycol) ether (Arkopal-40) as the main surfactant, didodecyldimethylammonium bromide (DiDAB) as the cosurfactant, decane as the continuous oil phase, and either a metal salt solution or a hexamethylenetetramine (HMTA) precipitation agent solution as the dispersed water phase. If you have any further questions about reclaiming a screen for screen printing, please contact us today.ZrO 2 and Fe 2O 3 precursor nanoparticles are synthesized, well-dispersed in decane, via a modified emulsion precipitation (MEP) method. NOTE: When using a pressure washer, always wear ear protection. Rinse both sides of the screen with pressure washer. ![]() ![]() Scrub with a brush until the emulsion starts to break down.Ĥ. Apply Chroma/Strip and let soak for 15-30 seconds. Scrub with a brush until you can see the emulsion start to break down and rinse with a pressure washer.Ģ. NEVER let the emulsion remover dry on the screen. Spray on the emulsion remover and let it soak in for about 15-30 seconds. You need around 1000-1500 PSI to properly blow the emulsion out of the mesh after the emulsion remover has been applied to the screen.Īnd finally, how you apply the emulsion remover is important. Without the proper pressure you will have a hard time getting the emulsion to wash out completely. The next thing to consider when reclaiming your screen is water pressure. If some parts of your screen are washing out fine, but other areas are being stubborn, your screen may not be coated evenly. An unevenly coated screen can cause issues when you try to reclaim the screen. First things first, make sure your screen is coated properly. When it comes to removing emulsion from your screen, there are a few things to consider. Your best best is to cut out the screen with a razor and have the frame re-meshed.Ĭlick below to watch a video in which Mick Orr, Applications & Training Specialist for Chromaline Screen Print Products, shows in detail what happens when you let emulsion remover dry on your screen. Unfortunately, the emulsion is now locked into the screen and the mesh is no longer any good. Once the emulsion remover dries on the screen, you will no longer be able to reclaim that screen. What can I do? Is my screen ruined?Įmulsion remover should NEVER be allowed to dry on your screen. The emulsion remover is now completely dried on the stencil and I can't get the emulsion to wash off. I applied Chroma/Strip screen reclaimer but then I got distracted with a phone call and forgot about it. I went to reclaim my screen after printing. In this Q&A, Mick addresses a common question we receive about what to do when emulsion remover dries on the screen during the reclaiming process.
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