Ask the expert.Q How can I overcome print defects in my low-VOC, water-based ink formulation for nonporous substrates? A Typically, water-based inks contain 5%-10% isopropyl alcohol isopropyl alcohol: see isopropanol. or other short chain alcohols to reduce ink surface tension and improve wetting over low-energy substrates. However, in order to formulate a low-VOC ink, these high-VOC alcohols must be removed, resulting in the need for a wetting agent wet·ting agent n. A substance that reduces the surface tension of a liquid, causing the liquid to spread across or penetrate more easily the surface of a solid. Noun 1. . Air Products offers several low-VOC surfactants that facilitate the wetting of nonporous substrates, including Surfynol[R] 2502, Surfynol 440 and Dynol[TM] 604 surfactants, which can eaily be incorporated into your water-based ink. All offer low equilibrium and dynamic surface tensions at low use levels, making them excellent choices for use in low-VOC, water-based inks where their exceptional substrate The base layer of a structure such as a chip, multichip module (MCM), printed circuit board or disk platter. Silicon is the most widely used substrate for chips. Fiberglass (FR4) is mostly used for printed circuit boards, and ceramic is used for MCMs. wetting can eliminate print defects on nonporous substrates. Jeanine Snyder Senior Development Chemist (jargon) chemist - (Cambridge) Someone who wastes computer time on number crunching when you'd far rather the computer were working out anagrams of your name or printing Snoopy calendars or running life patterns. May or may not refer to someone who actually studies chemistry. |
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