Custom film processor Wiman Corp., Sauk Rapids, Minn., worked with customer Debra Aperfine to develop flexible, waterproof thermochromic films for children’s apparel, novelties, and other applications. Thermochromic dyes and pigments change color with temperature. At a certain tunable temperature, the pigment color disappears and the material’s base color shows through. Thermochromic particles are larger than conventional pigments, so formulations for plastic films took years to adjust so that both colors show up uniformly. Aperfine’s company, Chameleon International in Oak Ridge, N.C., offers its patented ChroMyx films in PVC, TPU, PP, and PE extruded over a variety of fabric backings and in over 50 color pairs. Now Chameleon is developing thermochromic films with three or four color changes for new medical and industrial uses. (336) 643-0157 • www.chameleonint.com (320) 259-2554 • www.wimancorp.com
Editor PickSizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.