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How can I change hoding/packing pressure in BOY 15 S injection moulding machine?
And what is 'stepped injection pressure' metioned in user manual?

Thanks in advance.

Thanks! This will help a lot.

Thanks! Mechanical/thermal cleaners is preferable. I do not want to disassemble the mould.

Thanks! This will help a lot.

Polymer sometimes get stucked in the sprue after injection moulding. How can I clean stucked polymer from the sprue in a easy way?