How to make a silicon rubber pad
Ink is transferred from the cave of pad plate to the substrate by a silicon rubber pad in the process of pad printing. Please choose pad figure and hardness according to the substrate and printing quality. Know how to make a pad as below:
1.Mixing
Pouring mixing emulsion with silicon rubber and silicon oil as 100:20-50 percent into a clean plastic cup. Beat up it uniformity with a beating machine-KC-RM-20M mixxing machine.
2.Cleaning
Cleaning the plastic pad module and put it on the table. In order to remove the pad easily after solid, Please coating some Release agent on the mould.
3.Harding
Adding 3-5 gram harder to mix emulsion and put in a vacuum glass cover of motor machine KC-RM-20BV can vacuumized with 10kg Mixxing liquid . Start the machine for 2-4 minutes till the air in the mixing emulsions completely removed.
4.Pouring & Covering
Taking out mixing emulsion and pouring into pad module. Cover a wooden plate on it. There are two kinds of mould, One is Transparence resin mould, The other is PET adsorption mould . Pet adsorption mould is suitable for commonly rubber pads. Transparence resin mould more suitable for making high quality rubber pads.
5. Solidifying
Solidification speed is related with the environment temperature, higher temperature,faster solidification speed. Otherwise, in order to expedite solidification speed, please put more hardener into mixing emulsion.
6.Optimizing Hardness
Complete solidification requires 2-5 hours. Adjust the percentage of silicon oil can adjust the the hardness of rubber pad. Less percentage of silicon oil will produce a harder pad. When you increase the percentage of silicon pad, please add corresponding percentage of hardener. But, too much percentage of silicon oil will affect pad quality negatively. Precision hardness of rubber pad need measure with Shore durometer.
