ARM Thai Roto Profit 2010

8/6/2019 ARM Thai Roto Profit 2010

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Presented by: Gary Lategan

ARM Thai 2010Technical Seminar

Roto Profit!Roto Profit!


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Additives

Impact

Modifier

UV

Internal

release

Thermal

Stability

A2A1

The Rotomoulding Process

Polymer

Type

MFI

Grind

Particle size

ShapeShot Weight

P1 P2 P3

Moulds

Type

Thickness

Position

Rotation

SpeedsShielding

Air Movers

M1 M2 M3

Heating

Burner

Air Flow

Transfer

Distribution

MFI

PIAT

H1 H2

Cooling

Fast

Even

Cooling

Remove

InsertsHot

Demoulding

C1 C2 C3

Post Moulding

Storing

Jigging

Machining

Colour

TestingAssembly

J1 J1 J1

Moulded Part


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Why do we need todo testing?

Because it will help you!Make a quality partAnd

SAVE Money


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Material Specification SheetUV or NON UV Stabilisation

PIAT


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ARMO Dry Flow Funnel Test

Flow TestBulk Density Test


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Grind Quality

Sieve screen AnalysisParticle size

Particle size distribution

Particle shape


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Colour TestingPigment Test - Dry Blend

Colour Dispersion -Compound

Colour Match After 24hours

Light Box or Torch Test


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Compound Material

What pigment and What %Check for light penetration

And colour dispersion


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Visual Test

Inside Surface

Outside SurfaceSection view or

shaving


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Measure, Control & Improve

Drop Dart TestsMinus 40 Freezer

Temperature Monitoring


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SmellShrinkageWarpage


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Other important checks

Vent TubeParting line

Release AgentCheck &

Calibrate Scale


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The right mould

Type of material

And Thickness

Frame

Clamps

Rotation Speeds


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The right mould

Position on the spider

Method of attaching

Quick release the mould

Hinges, Hinges, Hinges


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How many moulds on a frame

What is the weight of the polymerVs

Weight of the mould, frame and arm

Are we heating polymer or metal!

The right mould


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Type of mould

Mould wall thickness

Inserts & Parting Line

Release Agent - Internal

The right mould


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The right mould

Selection of mould for product

Mould design

Mould clamping

Mould positioning

Type of mould to use


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The right machine

In my opinion it must be

3 station

Now what is it you wish to mould?

Carousel or

Rock and Roll Oven


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The right machine

Other important features!

Temperature Control

Pressure or Internal Cooling

Try to work without platforms


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So what have you done differently!

Today

Last week

Last year

Or are you happy to continue doingit the same for the rest of your life!


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Temperature

Monitoring and Control

Gives you the freedom to:

Experiment every cycle!

Make Real Time adjustment!

Control Multiple skin and Foaming!Mould New Materials


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Internal air temperature

0

50

100

150

200

250

0 10 20 30 40 50 60

time (min)

tem

perat

ure(deg

C)

The DNA of Rotational Moulding


392oF

212oF

C

A

BD

E

PIAT (Peak Internal Air Temperature)

Roy CrawfordUniversity of WaikatoRoy Crawford

University of Waikato


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More important, how can we

CONTROLand IMPROVE

what we have MEASURED!To

Improve bottom line profit!


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0

50

100

150

200

250

300

350

0 5 10 15 20 25 30 35 40 45

Moulding Cycle Time (mins)

Temperatu

re(C)

INTERNAL AIR TEMPERATURE

OVEN TEMPERATURE

OVEN TIME COOLING TIME

392oF

212oF

572oF

350 650375

The Heating Cycle


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Measure, Control & ImproveThe ideal Burner Performance

High Flame Low FlameThe oven fan speed

Direction of flow shot blast the mouldThe rate at which the mould is heated

NOT the oven


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The correct oven temperatureWhen to stop to thicken upRotation Ratios & Speeds

Achieve optimum PIAT every cycle


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0

50

100

150

200

250

0 10 20 30 40 50 60

time (min)

tem

perature(deg

C)

392oF

212oF

C

A

B

D

E


The Heating Cycle

This slope should NOT have

a double slope

Build-up rate of plastic should

be about 1mm/minEnd of powder pool.

Heating rate should beabout 30oC/min


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The cooling ratehas a major effect on the mechanicalproperties of the moulded part and

the cycle time!And yet it is the

least controlled phaseof the process !!

The Cooling Cycle


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0

50

100

150

200

250

300

350

0 5 10 15 20 25 30 35 40 45

Moulding Cycle Time (mins)

Temperature(C)

INTERNAL AIR TEMPERATURE

OVEN TEMPERATURE

OVEN TIME COOLING TIME

392oF

212oF

572oF

850 920 935

The Cooling Cycle

In the cooling stage you create the

structure in the part


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Cool as fast and as even as possiblePosition fans for even cooling

Demould at correct temperature


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0

50

100

150

200

250

0 10 20 30 40 50 60

time (min)

tem

pera

ture(deg

C)

392oF

212oF

C

A

B

D

E


The Cooling CycleCooling rate should be

about 20oC/min


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Benefits of Temperature Control?Benefits of Temperature Control?

Consistent quality!Consistent quality!

Reduced Scrap!Reduced Scrap!

Improved Output!Improved Output!

Increased Profit!Increased Profit!


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Moulding with

TEMPERATUREis the

FUTURE!


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TempLoggerTempLoggerTemperature Monitoring and ControlTemperature Monitoring and Control

For more info please contact me

Gary Lategan+27 82 8883180

[email protected]

or visit our website for downloads!

www.rotosolutions.co.za

For more info please contact me

Gary Lategan+27 82 8883180

[email protected]

or visit our website for downloads!

www.rotosolutions.co.za


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Thanks toSCG & Comos

&Thanks for your attention!

Thanks toSCG & Comos

&Thanks for your attention!

TempLoggerTempLoggerTemperature Monitoring and ControlTemperature Monitoring and Control

ARM Thai Roto Profit 2010

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