Such nomenclature, however, often induces confusion as the terms do not relate to the perceived origin of the extrusion defect
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.
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
It is well recognized that many polymer-processing operations (extrusion, melt spinning or film blowing) are disturbed by extrusion defects and flow instabilities, namely surface melt fracture (sharkskin), stick-slip defect (spurt instability), and gross melt fracture.
Over the half past century, researchers have tried to eliminate extrusion defects in several ways.