Polyethylene terephthalate oxalic ester or polyester (PET), PET plastic bottle production according to the type of billet preforming can be divided into different injection stretch blow molding (hereinafter referred to as blowing) injection and extrusion stretch blow molding (hereinafter referred to as crowded blowing).In the two forming methods, the injection blowing process is easy to control, high production efficiency, less waste defective goods and more general.
PET blow molding bottles can be divided into two kinds, one kind is pressure bottles, such as filling carbonated drinks containing gas bottle;Another kind of bottle without pressure, such as filling water, tea, edible oil bottle, etc.Tea beverage bottle is mixing polyethylene naphthalate formic acid ethyl ester (PEN) two modified PET bottles or the PET composite bottle with thermoplastic aromatic esters, belong to hot bottles on classification, can be more than 85 ℃ heat;Bottle water bottles are cold, with no heat resistance requirements.In the hot and cold cylinders similar molding process.The author mainly discussed the cold bottle beverage bottle pressure molding process.
1 equipment
Along with the advance of science and technology and the production scale, PET bottle blowing machine is more and more high degree of automation, production efficiency is becoming more and more high.Continuously improve equipment production ability, by the former thousands of bottles per hour production development to the present production of tens of thousands of bottles per hour.Operate by manual push button in the past to now also full computer control, greatly reduced the difficulty of the process operation, increase the stability of the process.
At present, PET automatic bottle blowing machine manufacturers abroad mainly French SIDEL, Germany KRONES company, our domestic have Guangzhou Xili machinery company etc.Although the manufacturer is different, but the similar equipment principles, generally include for slab system, heating system, bottle blowing system, control system and auxiliary five most.
conclusion
PET bottle blow molding process adjustment, was conducted for the corresponding material, if the material is poor, the requirement of process is very strict, even hard to blow molding of qualified out of the bottle.
