Page 61 - Plastics News January 2017
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Nordson launches Motorized PolyOne develops SynPlast
valve assembly for extrusion L9TM high-performing
coating plasticiser
Anew patent-pending motorized back pressure valve PolyOne has announced the commercial availability
assembly for extrusion coating and laminating is of SynPlast L9TM plasticiser, which contains
the first such system to provide closed-loop control, equivalent performance characteristics to 810TM
minimizing human error and the possibility of injury linear plasticiser. In addition, the new SynPlast
option for flexible PVC features supply stability to
when making manual help counteract historic supply chain disruptions of
adjustments, it was 810TM, and is formulated for use in wire and cable and
announced today by automotive slush moulding PVC applications. Flexible
Nordson Corporation. PVC compounders have traditionally relied on 810TM
Although extrusion to achieve critical performance properties at both
coating operates at elevated and low temperatures. When 810 alcohol
higher melt temperatures than other extrusion processes became scarce in 2013, a global supply shortage of
and requires use of a back pressure valve to reach 810TM plasticiser spurred a need for alternatives.
these temperatures, excess back pressure can lead to
polymer degradation. Installed between the extruder In cooperation with a leading wire and cable PVC
and the die, the new patent-pending EDI PolyStream™ compounder, PolyOne’s cross-functional Synthetic
motorized valve assembly uses closed-loop control to Esters team began developing another option.The
maintain back pressure within a range targeted to ensure result, SynPlast L9TM plasticiser, relies on linear 9
optimal processing. The drive for the valve responds to alcohol to achieve the same performance properties
a controller that receives a continuous flow of signals as 810TM, but with abundant supply availability.“The
from a pressure transducer, causing the valve to open at 810TM shortage could have spelled disaster for our
varying degrees in accordance with whether back pressure wire and cable compounding customers,” said Don
is trending too high or too low. Wiseman, General Manager, Performance Products
and Solutions at PolyOne. “The foresight and expertise
When the valve reaches its limit of opening as a result of of PolyOne’s Synthetic Esters team, combined with
excessive contaminant buildup on the filtration screen, PolyOne’s manufacturing agility, enabled rapid
an automated warning indicates that it is time to change development, production and delivery of a cost-
the screen. A human / machine interface (HMI) enables effective alternative.”
the operator to specify process conditions or to use
specifications from a recipe. The valve assembly can be
run manually, although Nordson recommends automated
closed-loop operation. The PolyStream valve assembly is
the first completely hands-free system for regulating back
pressure in extrusion coating, Back pressure conditions are
affected by numerous factors and are in a constant state
of flux. By making operator intervention unnecessary,
our new system helps to ensure coat weight consistency,
adequate adhesion to the substrate, and a high level of
product quality. The PolyStream assembly includes a
motor, breaker plate screen pack, linear valve, melt pipe,
control system, and optional display panel.
61 • January 2017 • Plastics News
