Firstly,clean the mold with detergent, and dry out the mold by an item of cloth or even an air gun after which coat the mold which has a layer of release agent.
2. The normal proportion relating to the pad printing silicon as well as the silicone oil depends on the requirements the customers can use. If pattern with big place to be printed, a soft silicon pad is needed and the volume of silicone oil is increased. Contrarily, if your silicon pad with higher hardness is required, the silicone oil should be added less or otherwise . The hardness of general pad printing silicone rubber is approximate of 15%~-25% if an excessive amount of silicone oil is added, the silicon pad is really soft that the printing times is bound, the molecular weight of the silicon will be damaged by the silicone oil regardless how superior quality the silicon is, thereby causing abrasion intolerance, solvent intolerance and ageing.
3.General mixing proportion can be as follows: add 30g silicone oil into 100g silicon using the hardness from the silicon pad being 20A%uFFFD, that’s well suited for the material printing for alloy car and items with small patterns and speak to areas. If a big pressure contact surface or possibly a soft silicon pad is needed, the mixing proportion between your silicon as well as the silicone oil may be 100:30-100:50. But please be aware that the harder quantity of silicone oil added, the softer the silicon pad, that may reduce points during the pad printing, abrasion resistance and solvent resistance. In addition, the days of pad printing will likely be correspondingly reduced that may cause increased cost and material waste.
4. The amount of the curing agent and also the chemical reaction with the silicon will be as follows: mix 100g silicon and 50g silicone oil sufficiently and evenly, you can add the curing agent which is 2%-3% from the total weight with the silicon along with the silicone oil, mixing for 2-3 minutes, after which deair to take out the air bubbles . The time of deairring generally doesn’t exceed 10 mins. If the deairing time is simply too long,it can fast curing from the silicon and impact the quality of silicon.
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