It is mainly used for the printing of irregular patterns such as plastic toys, electroplating products, electronic toys, trademarks, communication equipment, and craft gifts and stationery. Pad printing silicone rubber series brief description: printing plastic head is the pattern on the plate through the plastic head as a carrier, and then transfer the pattern on the steel plate on the toy product printing pad silicone requires fine quality, no impurities, good resilience, Good oiling, pattern printing clearly. The
First, clean the mold with detergent, and then wipe the moisture in the mold or air dry with a gun, and apply a layer of release agent.
Second, the normal proportion of printing silicone, silicone oil, is based on customer requirements and if the customer requires a large area of the printed pattern, the need to use a soft plastic head, to increase the silicone oil. On the contrary, if the hardness of the rubber head is large, no silicone oil is added or added. Generally, the hardness of the printing head is 15A~-25A°. If the silicone oil is too large, the plastic head is too soft and the number of printing is limited. No matter how good the quality of silica gel is, the silicone oil will destroy its molecular weight, resulting in no wear, solvent and aging.
Third, the introduction of the normal ratio is as follows: 100 grams of silica gel to add 30 grams of silicone oil, plastic head hardness of 15A °, to adapt to the printing alloy car Aberdeen and pattern is small, the contact area is relatively small products. If the pressure contact surface is large or the soft plastic head is required, the ratio of silicone to silicone oil can be 100:30, 100:50, but it should be noted that the greater the amount of silicone oil added, the softer the plastic head, the number of pad printing. The wear resistance and solvent resistance will be reduced and reduced. The number of printing products will also be reduced accordingly, resulting in increased costs and waste of raw materials.
Fourth, the amount of curing agent and the chemical reaction rate of silica gel is as follows: take 100 g of silica gel and 50 g of silicone oil, and then mix and stir. After silicone oil and silica gel are well mixed, press the total weight of silica gel and silicone oil by 2%- Add 3% curing agent, and then stir for 2-3 minutes, then take the time. The time for pumping out is generally less than 10 minutes. If the pumping time is too long, the colloid will soon solidify, which will affect the quality of the poured plastic.