Applications of pad printing silicon rubber

Pad printing silicon rubber is specially designed for makingprinting pads . It is mainly used for printing irregularpatterns of plastic toys, electroplating products, electronic toys,trademarks, etc.

Operation instruction for pad printingsilicon

1. Wash and clean molds with detergents, dry the molds and usean air gun if necessary, and apply a film of mold release.

2. Determine the normal proportion of pad printing silicon andsilicon oil on the basis of customer requirements. Add more siliconoils if a larger area of printed pattern and therefore soft rubberhead is needed by the customer. Otherwise, add no or less siliconoil for better hardness. For normal pad printing rubber head,hardness between 15 A°--25A°will be appropriate. If excessiveamount of silicon oil is added, the number of printing will belimited by an extremely soft rubber head, and the molecular weightof silicon of however supreme quality will be destroyed by siliconoil, and therefore, the phenomenon of compromised resistance toabrasion, solvent and aging.

3. The normal proportion is as follows: 100g silicon admixedwith 30g silicon oil for a hardness of 20 A° will be

suitable for pad printing for alloy toy cars and products withsmall patterns and contact area. If larger pressure contact surfaceor soft rubber head is required, the silicon and silicon oilproportion can be adjusted to 100:50, 100:80 and so on. Remember,the more silicon oil is added, the softer the rubber head will be,and the number of pad printing, resistance to abrasion and solventwill be undermined, and hence, heightened cost and more materialwaste.

4. Admixture amount of curing agent and chemical reaction ofsilicon: e.g., mix 100g of silicon with 50g of silicon oil, afterthey are sufficiently and evenly mixed, add curing agent as per 2%of the total weight of silicon and silicon oil, mix again for 2-3minutes before exhausting. Generally exhausting duration can notexceed 10 minutes; otherwise, the silicon will harden quickly toaffect the quality of molding.

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