Method of compressed molding
What is compressed molding?There are two types of molding in the shape forming of resin lacquerware. One is compressed molding and the other is mold injection.
Different resin materials are used in the two methods. In the compressed molding, urea resin, melamine resin, phenolic resin, etc. are used. These materials are called thermo-setting resin. Such resin material becomes soft when heated and when reaches a certain temperature, a chemical reaction occurs and the resin hardens. This is similar to how a soft cookie dough hardens when it is heated.
- Urea resin
- Convex shape metallic mold
- Concave shape metallic mold
Process of compressed molding
- 1. Supplying material Pour resin material in the lower mold.
- 2. Mold clamping The lower mold moves upward so that the upper mold and the lower mold clamp together.
- 3. Pressurization and heating The resin is melted by heating and is hardened by increasing the temperature and pressure.
- 4. Releasing The lower mold moves downward, the product is taken out and the burr is cut off.