Tool, tools double-punch

Melamine-formaldehyde resins are available in a range of colours and complementary or contrasting colours can be used in two-tone mouldings made with double-punch tools (as examples, cups and mugs that are white inside but a different colour outside). 

Multiple-action pressing Multiple-action pressing systems are those that support and compact each level of multilevel parts with a separate punch or tool member. Such tooling is used to minimize density gradients in complex compacts. Therefore, all of these more sophisticated machines also use one or the other method of double-motion pressing, as demonstrated in Figure 216. With the above descriptions the figures are self-explanatory. 

Die Pressing. Pressing of powders in rigid dies is carried out either in mechanical or hydraulic presses. The pressure is applied from the top, or from the top and bottom (double action presses). Die and punches are made of high-speed tool steel or... 

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