Operation Instruction of Silicone Mold for Pen Cas...

Prepare the necessary tools, such as rulers, knives, brushes, wood board, etc. Polish the original mold. Fix the mold on the wood board with glue. According to the size and shape of the mold, we divide it into two or multi-piece. It will be easy for demolding. The mold line should be positioned on the highest point of the mold. Pile up the clay under the mold line.   After fixing the clay, make latches which can avoid the dislocation between two pieces of silicone rubber mold. The latch should be about 1cm away from the mold.Brush a layer of release agent on the mold evenly(such as detergent, soapy water and Vaseline) Choose the type of silicone rubber according to the product’s structure, pattern and application. Here we use HY-635 silicone rubber, adding 2%-5% curing agent into the silicone rubber, then stir the silicone rubber and curing agent evenly。 Vacuum to -0.1MP, which can release bubbles. If no vacuumizer, you can reduce the proportion of the curing agent which can extend the curing time and release the bubbles by itself. After vacuum-pumping, brush the first layer of silicone rubber(the thickness<1mm) evenly on the mold. Brush the second layer of silicone rubber till the first layer is cured(about 15 minutes). The proportion of curing agent in second layer can be higher than the first layer. After brushing the second layer(or the third layer) of silicone rubber, cover the gauze(increase the tension of the mold) when the silicone stop flowing. Then brush the fourth layer of silicone rubber evenly. When the silicone rubber is cured, make the gypsum mold. Firstly, fix the paperboard around the mold without any gaps. Then pour the gypsum into the square. Remove the paperboard when the gypsum is cured, trim edge of the gypsum mold and clean up the clay on the other side. Repeat the above steps to make the other side of silicone mold and outer mold. Release the mold: Remove the paperboard when the outer mold is cured. Release the whole gypsum mold out off the silicone mold. Then check and trim the silicone mold with scissors. The silicone mold of pen case is finished. We suggest to put the silicone mold into production after 24 hours.