BLOWPLAS TECHNOLOGY CO., LTD.

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PROCESS

Process Flow Chart

Auxiliary-1: Dehumidifying Dryer

Auxiliary-2: Air Compressor and Air Dryer

Auxiliary-3: Water Chiller

Step-1: Inject naterial.

Step-2: Preform injected.

Step-3: Servo table rotates 180 ^o.

Step-4: Transfer preform to blow mold.

Step-5: Blow mold closes to blow.

Step-6: Bottles been blown.

Step-7: Transfer bottles to eject stand.

Step-8: Eject bottles.

Step-9: Conveyor transfers bottles out.

Advantages of Injection Stretch Blow Molding Process

Item	Extrusion Blow	Injection Stretch Blow
Waste (Burr)	Waste continuously comes out form production line. Small container is with higher waste ratio. Material cost is much higher.	Waste comes out only during start-up stage, free from recycle problem.
Orientation	Higher process temperature causes low orientation.	Highly orientation, container is much stronger.
Investment	Investment is low because only extruder and blow mold are required.	Investment is higher. In addition to injection machine and blow mold, extra injection mold is required. Over all efficiency is higher.
Clarity	With flow mark, less clarity.	No flow mark, high clarity.
Partline on Base	Partline on base, which becomes a week point.	No partline on base, container is stronger.
Shape of Base	Partline on base, shape of base is limited.	Many base shapes are available, better outer appearance.
Neck Dimension	Dimension is not stable.	Accurate in neck dimension.
Neck Opening	Opening is not flat.	Opening is flat and without any leakage.
Wall Thickness	Wall thickness is not even.	With even wall thickness.
Weight	Container is heavy, higher material cost.	Container is lightweight, lower material cost.