Extrusion Tubing Dies -- In-line and Crosshead

STANDARD IN-LINE TUBING DIES

• FLOW OF PLASTIC much more symmetrical with in-line die than with crosshead.
• IN-LINE DIE USUALLY BETTER for single lumen tubing than crosshead.
• SUPERIOR THERMAL DESIGN -- separate heater and sensor on "snout" allows close control of last portion of die that plastic sees. Heat for glossy surface; cool to increase back pressure.

IN-LINE "SPIRODIES"

• ALL FEATURES OF STANDARD IN-LINE die above
• PLUS...INTEGRAL "LEAKY SPIRAL" mixer downstream to eliminate spider lines in the tubing
• MIXER REMOVABLE when not needed. May be converted to standard die.

STANDARD CROSSHEAD DIES

• CROSSHEAD USUALLY RECOMMENDED for multi-lumen tubing. Air passages are straight through and far easier to clean if clogged.
• FAR SUPERIOR THERMAL DESIGN to most crosshead dies. Separate heater and sensor directly on "snout" allows close control of the part of the die the plastic sees last -- heat for glossy surface: cooler to increase back pressure.

CROSSHEAD SPIRODIES

• ALL FEATURES OF STANDARD CROSSHEAD ABOVE
• PLUS.... INTEGRAL "LEAKY SPIRAL" mixer downstream to eliminate weld lines in the tubing created where two plastic streams join.

STANDARD COEXTRUSION DIES

• TWO OR THREE layers.
• LAYERS JOIN AS FAR DOWNSTREM as possible to preserve layer integrity
• SEPARATE HEATER AND SENSOR on "snout", which is last part of the die the plastic sees. Heat for glossy surface; run cooler to increase back pressure.

"SPIRODIE" COEXTRUSION DIES

• SAME AS STANDARD COEXTRUSION die except each layer features a "leaky spiral" mixer to eliminate weld lines on the two sides of each layer where the plastic streams join.

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