blow molding 101 - accumulator head blow molding … molding 101 - accumulator head blow molding by...

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Blow Molding 101 - Accumulator Head Blow Molding

by

Bob Jackson – Jackson Machinery

John Rathman – Chevron Phillips Chemical LP

Annual Blow Molding Conference 2009October 7-8, 2009

Bartlesville, OK

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Blow Molding Process

• CONTINUOUS EXTRUSION• INTERMITTENT EXTRUSIONRECIPROCATING SCREWRAM ACCUMULATORACCUMULATOR

• INJECTION BLOW• INJECTION STRETCH BLOW• CO-EXTRUSION

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

CONTINUOUS EXTRUSION BLOW MOLDING

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Typical ContinuousExtrusion Blow Molder

Moldin BlowPosition

Parison

MoldunderDie Head

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

INTERMITTENT EXTRUSION BLOW MOLDING

RECIPROCATING SCREW

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Typical Reciprocating ScrewBlow Molding Machine

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

INTERMITTENT EXTRUSION BLOW MOLDING

RAM ACCUMULATOR

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Breakdown of “Ram” Accumulator Blow Molding Machine

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Accumulator Head Blow Molding

• Reasons for Development of Accumulator HeadThe desire to mold even larger partsThe need to extrude parison quickly to minimize hang

time and parison sag Issues with parison knit lineStrengthAppearance

More difficult to process high molecular weight polyethylene and form a good parison

Circumferential wall thickness distribution

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

INTERMITTENT EXTRUSION BLOW MOLDING

ACCUMULATOR HEAD

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Typical Reciprocating ScrewBlow Molding Machine

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Accumulator Head Blow Molding

• Development of Accumulator HeadThe head can be fed polymer continuouslyThe polymer stream enters and splits to flow around the

upper core to form the round parison shapeLonger time for polymer to weld back together and

form a strong knit lineCapable of fast parison extrusion ratePolymer flow does not have to split and rewelded

during parison extrusionBetter parison circumferential wall thickness

distribution

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Hartig Accumulator Head

• Ram• Programming

Rod• Manifold• Flow Divider• Pressure Ring• Core Receiver• Mandrel Stem

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Development of Accumulator Head

• LIFO DesignLast In First Out

Partition wall for plunger

Good parison quality but large temperature differential from bottom of parison to top of parison

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Development of Accumulator Head

• FIFO DesignFirst In First Out

No partition wall for plunger

Good parison quality with a more balanced temperature differential from bottom of parisonto top of parison

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Development of Accumulator Head

• Bleed PortsFirst In First Out

Lubrication between the plunger and ID of accumulator barrel & flow divider

Material will flow past plunger and out of bleed ports on top of accumulator

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Uniloy Accumulator Head

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Kautex “In-Line” Head

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Diagram of Hartig Accumulator Head

CONFIDENTIAL INFORMATIONThe information contained herein is the confidential intellectual property of Chevron Phillips Chemical Company LP and may not be copied or reproduced without written permission.

Thank You!