MAKE THE TOOLING CHANGEOVER TO CONCEPT EXTRU-TECH LIMITED EXTRUSION TOOLING TECHNOLOGY CONCEPT EXTRU-TECH LIMITED TEL: 44 (0)

QUALITY THE KEY TO SUCCESS CONCEPT SHEATHING, STRIPING & SKINNING CROSSHEADS

CONCEPT TORPEDO SPIDERS

CONCEPT SHEATHING CROSSHEAD 40 MM TO 75 MM

 STATE OF THE ART TECHNOLOGY

CONCEPT BREAKER PLATES NO JOB TOO SMALL

TO SCALE - SEE MOBILE PHONE

FLOWPATH FOR CREATIVE 150 SHEATHING & STRIPING CROSSHEAD

Concept Extru-Tech DESIGN AND MANUFACTURE CROSSHEADS AND DIES TO MATCH:  PRODUCTION OUTPUT  MATERIAL RHEOLOGY CET USE COMPUPLAST  TECHNOLOGY TO OPTIMISE THE FLOW OF MELT THROUGH THE DIE

Side Fed Dies n The center mandrel is supported below the entry point of the material. n Polymer enters from the side and flows around the center mandrel. Inlet Exit Land Body Mandrel Extension Mandrel Adapter Inflation Air

Balancing of flow is required to ensure uniform distribution n Material will prefer to take the shortest path from the entrance to the exit. n This will result in more material flowing along the inlet side.

Side Fed Die Inlet Outlet Through Hole

Unwrapped Side Fed Die Inlet Channel Restriction Chamber Outlet

Path Comparison Inlet  P1  P2 For uniform flow  Q1  Q2

Side Fed Die Potential Problems Weld Line Thick Thin Thickness Variation, Period = 2

SPIRAL MANDREL TECHNOLOGY FOR 3 LAYER PETROLEUM PIPE

Spiral Mandrel Dies n Commonly used for tubular (blown) film production since 1950’s. n In more recent years applied to pipe and blow molding dies

Spiral Mandrel Die & Body

Spiral Mandrel Flow Field DIE INLET ENTRY PORT DIE EXIT INFLATION AIR

Unwrapped View Use periodicity to simplify analysis o oo oo

Qin Qs1 Qs2 Qs3  P1=  P2 Flow Path Comparison

More Complicated Analysis Flow between plates Flow in ‘U’ channel Flow from lower channels Leakage out of channel Flow from previous section channels

Fully 3-D Flow Field

Weld Line Orientation Spider DieSpiral Die

Design Evaluation Flow Distribution Good Design Uniform Thickness Poor Design Periodic Thickness Equal to # of Spirals

Design Evaluation Circumferential Position Channel Flow Channel Position Slow Initial Leakage Fast Initial Leakage Flow Variation

Position [°] Thickness variation [%] Run 1 Run 2 Simulation Spiral Mandrel Die Comparison with experiment

Potential Problem Rapid reduction in channel flow will result in the remainder of the channel having too little material flow and consequently a high residence time If sufficient material leaks out prior to the first spiral overlap, then it is quite likely that this will result in a visual defect in the final product. A type of Port Line

Design Evaluation Additional Criteria n Final Distribution n Velocity/Shear Rate/Shear Stress n Pressure Drop n Sensitivity to Material Changes n Sensitivity to Process Conditions n Sensitivity to Manufacturing Tolerances

Calculation Methods n Step by step calculations n Develop analytical expressions related to the geometry and solve for the correct dimensions. n Control Volume Method analysis n Finite Element Method analysis

STACKED DIES Each layer is added sequentially. Each distribution module can have the same surface area. All layers (except the inner layer) can have the same residence time.

CONCEPT 150 CROSSHEAD

GENERAL ARRANGEMENT

WALL SHEAR STRESS FIELD 150 CROSSHEAD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE SHEAR STRESS

WALL SHEAR RATE FIELD 150 CROSSHEAD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE SHEAR RATE

PRESSURE FIELD 150 CROSSHEAD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE PRESSURE DROP THROUGH THE DIE

AVERAGE RESIDENCE TIME FIELD 150 CROSSHEAD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE MATERIAL RESIDENCE TIME

BULK TEMPERATURE FIELD 150 CROSSHEAD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE TEMPERATURE VARIATIONS

CONCEPT GUIDE PINS

CET 420 CALIBRATOR

POLYMER FLOW DISTRIBUTOR CET HAVE SOLUTIONS TO YOUR PROBLEMS

PROUD OF A HIGHLY SKILLED WORKFORCE

CET CRAFTMANSHIP CET EXTRUSION TOOLING

SPIRAL MANDREL INNER DIE

PROVIDING YOU WITH QUALITY TOOLS TO MANUFACTURE YOUR QUALITY PRODUCTS