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What is pet preform manufacturing process?
Step2: Injecting the plastic into the preform mold
Before making plastic bottles, the preform is produced using an injection molding process (injection molding machine). Once the plastic is molten, a screw mechanism injects the molten PET plastic into a preform cavity in the shape of a preform. PET preforms are much more compact than fully molded bottles.
After the plastic is injected and fills the preform mold cavities, the product is cooled and shaped inside the mold. After cooling, the preforms are hard enough to be ejected from the mold.
However, the point to note here is that if the cooling effect is not good, the preforms will appear to be whitened. Because if the injection pressure is small, low injection speed, the first injection failed to fill the cavity, the first injection of the material flow front will be because of poor contact with the mold wall so that the temperature does not fall below the glass transition temperature, thus forming a large number of nuclei.
Step4: Blowing preforms into bottles
The process of blowing the preforms made by the injection molding machine into bottles is called blow molding.
Place the preform in a blow mould. Inject compressed air into the preform to inflate it until it is close to the cavity wall, and maintain the blowing pressure until the bottle cools. The plastic bottles are then removed after cooling.
Step5: Testing for PET bottles
Rigorous testing of PET bottles on the production line is the final step before packaging to ensure compliance with industry standards. Tests include: impact test, pressure test, permeability test, transparency check.
| INTERNATIONAL CLASS NO | HCK310-PET | |
| INJECTION UNIT | ||
| Screw diameter | mm | 75 |
| Screw L/D ratio | L/D | 25 |
| Shot volume(theoretical) | cm3 | 1436 |
| Injiection weight(pet) | g | 1666 |
| Injection rate | cm3/s | 548 |
| Injection pressure | Bar | 1330 |
| Screw pressure | rpm | 167 |
| CLANPING UNIT | ||
| Clamping force | kN | 3100 |
| Open stroke | mm | 610 |
| Space between tie bars(W×H) | mm | 670*620 |
| Max.Mold height | mm | 670 |
| Min.Mold height | mm | 270 |
| Ejector stroke | mm | 170 |
| Ejector force | kN | 110 |
| OTHERS | ||
| Pump pressure | Bar | 175 |
| Pump motor power | kW | 42 |
| Heating power | kW | 20 |
| Number of heating area | Segment | 4+1 |
| Machine dimension(L×W×H) | m | 7.0*1.6*2.3 |
| Oiltank cubage | L | 400 |
| Machine weight | t | 9.5 |
- Location: Ningbo,Zhejiang, China
- Company type: Manufacturing
- Year founded: 2005
- Main product: Plastic Injection Mold, Plastic Injection Molding Machine from 50T-3000T
The machines have high rigid structure and equipped with imported hydraulic and electrical elements, It also uses mixing metal screw head in order to have excellent plastifying performance and it's suitable for plastic injection molding products.
Services and Advantages
One-stop solution: complete solution from mold design to machine configuration.
Technical Support: Provide online and engineer support to ensure customer's production needs.
Fast delivery: average delivery time is 15 days.
After-sales service: provide comprehensive pre-sales, in-sales and after-sales service.
