Advantages of bottle blowing machine extrusion blow molding

Extrusion blow molding is a common plastic bottle manufacturing process with many advantages. The following is an introduction from the aspects of equipment, products, and costs:

Equipment-related advantages
- Structural and material advantages: The screw center shaft and cylinder of the extrusion blow molding machine are usually made of 38CrMoAlA chromium, molybdenum, and aluminum alloys treated with nitrogen. This material has the advantages of high thickness, corrosion resistance, and wear resistance. It can ensure the stability and reliability of the equipment during long-term use and reduce the maintenance frequency and cost of the equipment.
- Unloading and adjustment advantages: The unloading equipment adopts peeling rotation equipment and center rotation equipment, and uses a torque motor to adjust the film smoothness for easy operation. This enables more accurate control of the molding quality of plastic bottles during the production process and improves production efficiency.
- Gas output and lifting advantages: The complex structure of the film blowing machine makes the output gas more uniform, which is conducive to the uniform expansion of the plastic preform, thereby ensuring the uniformity of the wall thickness of the plastic bottle. The lifting unit adopts a square frame platform structure, and the height of the lifting frame can be automatically adjusted according to different technical requirements, which increases the flexibility and applicability of the equipment.

Product-related advantages
- Performance advantages: During the blow molding process, the preform is formed by the die head and blown at a relatively low pressure, which determines that the blow-molded product has less residual stress, higher strain resistance such as tensile, bending, and impact resistance, and has a good service life.
- Raw material advantages: The raw materials used in the extrusion blow molding machine (such as PE) have excellent low temperature resistance, good chemical stability, and good crack resistance, which can meet the use requirements in different environments.
- Molding advantages: After the preform flows out through the extruder head, it directly enters the blow molding mold for molding, without secondary heating, and has high production efficiency. Moreover, the wall thickness of the bottle body can be changed by simply adjusting the die gap or extrusion conditions, which is very beneficial for products where the required wall thickness cannot be accurately calculated in advance.

Cost-related advantages
- Equipment cost: The cost of blow molding machinery (especially blow molding molds) is relatively low. For example, when molding the same product, the cost of blow molding machinery is about 1/3 or 1/2 of that of injection molding machinery, which reduces the company's initial investment cost.
- Production cost: Since there is no need for complex processes such as secondary heating and the production efficiency is high, the production cost of the product is relatively low, which improves the economic benefits of the enterprise.

Advantages of process flexibility
- Wide selection of raw materials: Extrusion blow molding equipment has a wider selection of raw materials, and can use a variety of different types of plastic raw materials to meet the performance requirements of different products.
- Diverse product shapes: Blow molding can form complex, irregular and integral products, which can meet the diverse product needs on the market.