MAKE THE TOOLING CHANGEOVER TO

CONCEPT EXTRU-TECH LIMITEDEXTRUSION 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 CONCEPT SHEATHINGSHEATHING CROSSHEADCROSSHEAD

40 MM 40 MM TO 75 MMTO 75 MM

STATE OF THE ART STATE OF THE ART TECHNOLOGYTECHNOLOGY

CONCEPTBREAKER 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 DiesSide Fed Dies

The center The center mandrel is mandrel is supported below supported below the entry point the entry point of the material.of the material.

Polymer enters Polymer enters from the side from the side and flows around and flows around the center the center mandrel.mandrel.

Inlet

Exit Land

Body

Mandrel Extension

Mandrel Adapter

Inflation Air

Balancing of flow is Balancing of flow is required to ensure required to ensure

uniform distributionuniform distribution

Material will prefer to take Material will prefer to take the shortest path from the the shortest path from the entrance to the exit.entrance to the exit.

This will result in more This will result in more material flowing along the material flowing along the inlet side.inlet side.

Side Fed Die

Inlet

Outlet

Through Hole

Unwrapped Side Fed Unwrapped Side Fed DieDie

Inlet

Channel

Restriction

Chamber

Outlet

Path ComparisonPath Comparison

Inlet

P1 P2For uniform flow Q1 Q2

Side Fed DieSide Fed DiePotential ProblemsPotential Problems

Weld Line

Thick

Thin

Thickness Variation, Period = 2

SPIRAL MANDREL TECHNOLOGY FOR 3 LAYER

PETROLEUM PIPE

Spiral Mandrel DiesSpiral Mandrel Dies

Commonly used Commonly used for tubular for tubular (blown) film (blown) film production production since 1950’s.since 1950’s.

In more recent In more recent years applied to years applied to pipe and blow pipe and blow molding diesmolding dies

Spiral Mandrel Die & Spiral Mandrel Die & BodyBody

Spiral Mandrel Flow Spiral Mandrel Flow FieldField

MANDREL BODY

DIE INLET

ENTRY PORT

DIE EXIT

INFLATION AIR

Qin

Qs1Qs1

Qs2Qs2

Qs3Qs3

P1 = P2

Flow Path Flow Path ComparisonComparison

Fully 3-D Flow FieldFully 3-D Flow Field

Weld Line Orientation

Spider Die Spiral Die

Design EvaluationDesign EvaluationFlow DistributionFlow Distribution

Good DesignUniform Thickness

Poor DesignPeriodic ThicknessEqual to # of Spirals

Design EvaluationDesign Evaluation

Circumferential Position

ChannelFlow

Channel Position

Slow Initial Leakage

Fast Initial Leakage

FlowVariation

0 60 120 180 240 300 360

Position [°]

-8

-6 -

4 -2

0

2

4

6

Th

ickn

ess

vari

atio

n [

%]

Run 1 Run 2 Simulation

Spiral Mandrel DieComparison with experiment

Potential ProblemPotential ProblemRapid 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 EvaluationDesign EvaluationAdditional CriteriaAdditional Criteria

Final DistributionFinal Distribution Velocity/Shear Rate/Shear StressVelocity/Shear Rate/Shear Stress Pressure DropPressure Drop Sensitivity to Material ChangesSensitivity to Material Changes Sensitivity to Process ConditionsSensitivity to Process Conditions Sensitivity to Manufacturing Sensitivity to Manufacturing

TolerancesTolerances

STACKED DIESSTACKED 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

150 CROSSHEADTHE

PROCESS OF SIMULATING

FLOW THROUGH

THE DIE SHOWING

THE SHEAR

STRESS

WALL SHEAR RATE FIELD

150 CROSSHEADTHE PROCESS OF

SIMULATING FLOW

THROUGH THE DIE

SHOWING THE SHEAR RATE

PRESSURE FIELD

150 CROSSHEADTHE PROCESS

OF SIMULATING

FLOW THROUGH THE DIE SHOWING

THE PRESSURE DROP

THROUGH THE DIE

AVERAGE RESIDENCE TIME FIELD

150 CROSSHEADTHE PROCESS OF

SIMULATING FLOW

THROUGH THE DIE SHOWING

THE MATERIAL RESIDENCE

TIME

BULK TEMPERATURE

FIELD

150 CROSSHEADTHE PROCESS OF SIMULATING

FLOW THROUGH THE DIE SHOWING

THE TEMPERATURE

VARIATIONS

CONCEPTCONCEPT

GUIDE PINSGUIDE 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