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Plastic Blow Moulding: PET Bottles and HDPE Drums
Hollow plastic is blown. A PET drinks bottle starts as an injection-moulded preform, a thick test tube with the finished screw neck; it is reheated, usually with infrared heaters, above its glass transition temperature, stretched by a core rod and blown with high-pressure air against a cold metal mould. Drums and jerrycans are extrusion blow moulded: a hot tube, the parison, is extruded, closed in the mould and blown out.
Osezingeni eliphezulu
Seconds per bottle
Imiyalelo
1
1
Preforms
Preforms
PET preforms come from injection moulding with the neck finished; they are dried and stored.
Izinto zokwakha zalesi sinyathelo:
Isakhiwo sokuqala sebhodlela100 izicucu2
2
Reheat
Reheat
Preforms pass infrared heaters until soft, just above PET's glass transition temperature.
Amathuluzi adingekayo:
Umshini wokubumba ngokufutha wasetafuleni3
3
Stretch and blow
Stretch and blow
In the closed bottle mould a rod stretches the preform lengthwise while high-pressure air blows it out to the mould wall, which cools it.
Amathuluzi adingekayo:
Umshini wokubumba ngokufutha wasetafuleni
Imfoloma yokufutha4
4
Extrusion blow moulding
Extrusion blow moulding
For HDPE drums, a parison is extruded downward, the mould closes on it, pinching the bottom, and air blows it out.
Izinto zokwakha zalesi sinyathelo:
Ama-pellet e-HDPE20 kgAmathuluzi adingekayo:
I-extruder yepulasitikiImfoloma yokufutha5
5
Check
Check
Bottles are checked for even wall thickness and leaks.
Amathuluzi adingekayo:
I-Caliper Yedijithali Yamayintshi Ayi-6Izinto
2- 100 izicucuIsibambeli
- 20 kgIsibambeli
Amathuluzi Adingekayo
4- Isibambeli
- Isibambeli
- Isibambeli
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