compressor is the air source for PET stretch blow molding machine. It
compresses air from atmospheric pressure to required pressure. For
bottle production process, generally, multi-stage reciprocating type
(piston type) air compressor is adopted, which is generally made up of
3-stage or 4-stage cylinders to compress the air to 10~40 bar output
pressure step by step according to different requirement.
compressors are comprised by several key components: compressor head,
motor, air tank and so on. The compressor head and the motor are both
installed on the plate of the tank. The whole set is easily movable. The
compressor head is driven to work by the motor through the V-belt
transmission. Passing through the air filter, the air is inhaled into
the 1st stage cylinder, where it is compressed to a certain pressure.
After being cooled in the intermediate cooler, the compressed air is
inhaled into the 2nd stage cylinder and finally compressed to the rated
pressure. It enters the air tank via the check valve and ready for use.
For PET bottle blow molding, usually 20~40 bar compressed air required
But to drive the PET stretch blow molding machine, only 8 bar is needed.
So two kinds of air compressor to be required: High-pressure one to
supply high pressure compressed air to blow bottle and Low-pressure one
to supply low pressure compressed air to drive the machine.
series air compressors are piston type machine, compressed air contains
some water, oil and dust. But for PET bottle blow molding, purified
compressed air (oil-free, water-free, dust-free) is necessary. Thus, an
air purifier is necessary.
- Automatic Unload Device.
- Sucking & Draining Valves
Stainless steel valve made of Sweden Sandvik 7C27M02
steel, critically lathe & grinder machined, stress
eliminated, to assure excellent strength and anti-impact under high
- Air Filter
Made of imported materials, with perfect filtering and muffling
result, and long service life.
- Cylinder Cover
Streamlined air tunnel with excellent cooling result.
Cylinder body machined and grinded by precision CNC to assure
- Piston Ring
Adopts Riken Ring (Japan) made of fine
material, preventive to scrape on cylinder body, low oil
consumption, avoidance to carbon gathering.
- Tie Rod
Tie rods machined and holed by special machining tool with
guaranteed parallelity, leads to more smooth and stable running of
air compressor, and lower consumption of lubricating oil.
Parts wear abrasion adopt wearing-resistant steel with their surface
hardened, to assure best wearability. Crank equipped counter weight
to lower vibration.
- Crank Box
All the orifices and surfaces done in once by one integrated CNC
machine to assure parallelity and verticality.
- Belt Wheel
Dynamically balanced belt wheel integrated with fan by iron casting
leads to perfect flywheel result, low noise, stable running.
Bearing of high performance and long service life made by Sino-US
- Cooling Copper Tube
With technical design on high cooling effect, the tube is specially
used for reducing temperature.