As shown previously, grainy defects could not be related to extrusion defect observed at high shear rates.
Extrusion defects at high shear rates were observed, as shown in Fig.
Different extrusion defects
are encountered depending on the polymer characteristics and prevalent processing conditions.
The range's ability to cover substrate imperfections, such as welds and extrusion defects
, and the consistent appearance at different film thicknesses, reduces nonconformity and can lead to fewer rejected parts.
The advantages of ALUM-EX aluminium sections are: (1) smooth and possess durable finish, (2) colour retention, (3) corrosion resistant and (4) no extrusion defects
Over the half past century, researchers have tried to eliminate extrusion defects
in several ways.