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The 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 MachineryJohn Rathman Chevron Phillips Chemical LP
Annual Blow Molding Conference 2009
October 7-8, 2009
Bartlesville, OK
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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 EXTRUSION
RECIPROCATING SCREW
RAM ACCUMULATOR
ACCUMULATOR
INJECTION BLOW
INJECTION STRETCH BLOW
CO-EXTRUSION
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The 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
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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Diagram of Typical Continuous
Extrusion Blow Molder
Mold
in Blow
Position
Parison
Mold
under
Die Head
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The 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
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The 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 Screw
Blow Molding Machine
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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 parts
The need to extrude parison quickly to minimize hang
time and parison sag Issues with parison knit line
Strength
Appearance
More difficult to process high molecular weight
polyethylene and form a good parison
Circumferential wall thickness distribution
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CONFIDENTIAL INFORMATION
The 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
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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 Screw
Blow Molding Machine
7/31/2019 Accumulator Head Blow Molding - B. Jackson, J. Rathman.pdf
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The 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 continuously
The 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 line
Capable of fast parison extrusion rate
Polymer flow does not have to split and reweldedduring parison extrusion
Better parison circumferential wall thickness
distribution
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Diagram of Hartig Accumulator Head
Ram
Programming
Rod Manifold
Flow Divider
Pressure Ring Core Receiver
Mandrel Stem
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Development of Accumulator Head
LIFO DesignLast In First Out
Partition wall forplunger
Good parison quality
but large temperature
differential frombottom of parison to
top of parison
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Development of Accumulator Head
FIFO DesignFirst In First Out
No partition wall forplunger
Good parison quality
with a more balanced
temperature differentialfrom bottom of parison
to top of parison
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Development of Accumulator Head
Bleed PortsFirst In First Out
Lubrication betweenthe plunger and ID of
accumulator barrel &
flow divider
Material will flow pastplunger and out of
bleed ports on top of
accumulator
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Uniloy Accumulator Head
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Diagram of Kautex In-Line Head
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Diagram of Hartig Accumulator Head
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