Extrusion & Post
12 görüntüleme
Spiral Marks in PEEK Extrusion
Sorun Belirtisi
Spiral flow marks rotating with the screw appear in the core of PEEK extruded rods, with annular texture visible in the cross-section, affecting the uniformity of subsequent machining performance of the rod.
Neden Analizi
After leaving the screw, the melt still retains a rotational flow component and is shaped in the die before being fully stabilized; the die land length is insufficient or lacks a flow-splitting and stabilizing structure, so the rotational texture is carried into the product.
Çözüm
①Install a breaker plate and screen pack assembly to break up the rotational flow; ②Extend the die land length to stabilize melt flow; ③Thoroughly clean the screw and barrel to remove accumulated material that disturbs flow; ④Appropriately reduce the screw speed.
Temel Çıkarım
PEEK rod spiral marks originate from the melt's rotational flow not being stabilized; a breaker plate and an extended land are the standard solutions; the influence of screw cleanliness on flow stability cannot be ignored.
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