Transcript Cookson Extrusion Technologies - Extru-Tech
MAKE THE TOOLING CHANGEOVER TO CONCEPT EXTRU-TECH LIMITED EXTRUSION TOOLING TECHNOLOGY CONCEPT EXTRU-TECH LIMITED TEL: 44 (0)121 520 8252
QUALITY THE KEY TO SUCCESS
CONCEPT SHEATHING, STRIPING & SKINNING CROSSHEADS
CONCEPT
TORPEDO SPIDERS
CONCEPT EXTRU-TECH LTD. UK’s NO.1 HI-TECH MULTI-LAYER DIE MANUFACTURERS .
CET 125 3-LAYER TUBE HEAD
MULTI-PURPOSE TUBE DIE HEAD. FOR SINGLE LAYER TUBE WITH OR WITHOUT STRIPES. FOR TWIN LAYER TUBE WITH OR WITHOUT STRIPES. FOR THREE LAYER TUBE WITH OR WITHOUT STRIPES. CONVERSION TO CROSSHEAD FOR CONDUCTOR OR ROPE OPTIONAL.
DESIGNED TO MEET CUSTOMERS’ SPECIFIC REQUIREMENTS. DESIGNED WITH LATEST SPIRALCAD
FLOW SIMULATION SOFTWARE TO GIVE OPTIMUM OUTPUT AND MATCH MATERIAL RHEOLOGY.
CONCEPT SHEATHING CROSSHEAD 40 MM TO 75 MM
STATE OF THE ART TECHNOLOGY
NO JOB TOO SMALL
CONCEPT BREAKER PLATES
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
Inflation Air Exit Land
The center mandrel is supported below the entry point of the material.
Polymer enters from the side and flows around the center mandrel.
Mandrel Mandrel Extension Body Inlet Adapter
Balancing of flow is required to ensure uniform distribution
Material will prefer to take the shortest path from the entrance to the exit.
This will result in more material flowing along the inlet side.
Side Fed Die Outlet Inlet Through Hole
Unwrapped Side Fed Die
Outlet Chamber Restriction Inlet
Path Comparison
For uniform flow
P1
Q1
P2
Q2 Inlet
Thick Side Fed Die Potential Problems Weld Line Thin Thickness Variation, Period = 2
SPIRAL MANDREL TECHNOLOGY FOR 3 LAYER PETROLEUM PIPE
Spiral Mandrel Dies
Commonly used for tubular (blown) film production since 1950’s.
In more recent years applied to pipe and blow molding dies
Spiral Mandrel Die & Body
Spiral Mandrel Flow Field
DIE EXIT MANDREL BODY ENTRY PORT DIE INLET INFLATION AIR
Qs3 Qs2 Qs1 Qin
Flow Path Comparison
P1 =
P2 Qs3 Qs2 Qs1
Fully 3-D Flow Field
Weld Line Orientation Spider Die Spiral Die
Design Evaluation Flow Distribution Good Design Uniform Thickness Poor Design Periodic Thickness Equal to # of Spirals
Design Evaluation Flow Variation Channel Flow Circumferential Position Slow Initial Leakage Fast Initial Leakage Channel Position
Spiral Mandrel Die
Comparison with experiment Run 1 Run 2 Simulation 0 60 120 180 240 300 360 Position [ °]
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
Final Distribution Velocity/Shear Rate/Shear Stress Pressure Drop Sensitivity to Material Changes Sensitivity to Process Conditions Sensitivity to Manufacturing Tolerances
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
CONCEPT 150 CROSSHEAD GENERAL ARRANGEMENT
WALL SHEAR STRESS FIELD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE SHEAR STRESS 150 CROSSHEAD
WALL SHEAR RATE FIELD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE SHEAR RATE 150 CROSSHEAD
THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE PRESSURE DROP THROUGH THE DIE PRESSURE FIELD 150 CROSSHEAD
THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE MATERIAL RESIDENCE TIME AVERAGE RESIDENCE TIME FIELD 150 CROSSHEAD
BULK TEMPERATURE FIELD THE PROCESS OF SIMULATING FLOW THROUGH THE DIE SHOWING THE TEMPERATURE VARIATIONS 150 CROSSHEAD
CONCEPT GUIDE PINS
CET 420 CALIBRATOR
POLYMER FLOW DISTRIBUTOR CET HAVE SOLUTIONS TO YOUR PROBLEMS
PROUD OF A HIGHLY SKILLED WORKFORCE
CET EXTRUSION TOOLING CET CRAFTMANSHIP
SPIRAL MANDREL INNER DIE
PROVIDING YOU WITH QUALITY TOOLS TO MANUFACTURE YOUR QUALITY PRODUCTS