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!