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The advantages of two-step PET preform molding
PET dominates the bottle market
Traditionally, PVC, PC, PE and PP have been widely used in the manufacture of plastic bottles. However, PET has quickly seized the market's main position in the past 10 years. Because PET not only shows excellent tensile properties in the stretch blow molding of bottles, but also has a good performance on the pressure of carbonated drinks. Gas barrier is also much higher than PVC, PC, PE and PP.
Not only that, PET is also more effective in blocking the evaporation of water vapor. The plasticizing temperature of PET is 243-270°C. PET also has good heat resistance, thermal oxidation resistance, good gloss and optical properties, small specific gravity, low acetaldehyde content and reasonable price; these advantages Makes it the main raw material for plastic bottles.
With the rapid improvement of PET processing technology, its strong plasticity makes it occupy the main position of the packaging market.
At present, PET is widely used in the packaging of soft drinks, mineral water, candy biscuits, cooking oils, cosmetics, pharmaceuticals and cleaning products.
Two-step PET preform molding has good economics PET bottles are manufactured in two ways, one-step and two-step. One-step method is to inject PET into the tube blank and blow it into a given bottle shape without cooling. This obviously inefficient process is mainly used in small batch production.
With the popularity of large-capacity carbonated beverages, two-step production has become an inevitable solution, and the two-step molding process shows its advantages in the formation of large quantities of billet.
The two-step PET bottle production process consists of two main steps:
Preform factory Injection molding tubular preform
Delivery of preforms to beverage production sites
Beverage filling plant
Blowing bottles with compressed air and filling beverages
The advantages of two-step molding:
1. PET bottles can be recycled.
2. Suitable for medium and large batch production.
3. The degree of acetaldehyde is very low: 3 x micrograms of soda water X - 5 ppm of mineral water
4. No leakage from the bottle mouth.
5. The preform will not be eccentric.
6. The preform will not be deformed and discolored.
7. In the case of meeting the same mechanical strength, the two-step PET bottle can reduce the weight by 10-15%, without any loss of performance. As a result, raw materials and production costs have dropped significantly.
8. Transport and storage costs are significantly reduced because they are delivered to the beverage filling line in preforms (relatively small) rather than bottles.
9. Separate the preform production from the bottle blowing process to optimize the production process and avoid waste of production capacity. Blowing and preform production equipment is significantly different in speed, capacity and cost.
10. The product defective rate is extremely low.