It is difficult for new process technologies to become established in extru
sion technology. A number of the reasons for this are the high line costs,
the low number of new lines being installed, the risk of a new technology n
ot giving the desired results after all and the high costs of the tests req
uired on production line. Despite this, new ideas and solutions are repeate
dly emerging which are aimed at both reducing the production costs of extru
ded products and improving product quality.