Why was Dull Surface happened?
Main causes : 1. Unstable flowing speed. 2. Bad processing conditions. 3. The effect from the volatility in coloring powder. Molding conditions, and injection machines (Solution 1) : 1. Adjust the temperatures in injecting and the mold. 2. Adjust the injecting speed. 3. Clean up the moisture, oil, and the leftover gas, which were stuck on the mold surface. Designs in molding products and models (Solution 2) : 1. Good polishing of the mold is a must. 2. Improve the gas venting. Materials (Solution 3) : 1. Change the colorant, dispersing agents, and lubricants. 2. Replace with materials of better flowing. 3. Use materials of less volatility and and can absorb humidity. 4. Dry up fully.
