Blow moulding is a manufacturing process used to create hollow plastic parts, containers, and bottles. There are three main types of blow moulding techniques commonly used in the industry:
Extrusion Blow Moulding:
1. Firstly, plastic pellets are fed into a heated barrel where they are melted.
2. The melted plastic is then extruded through a die to form a hollow tube called a parison.
3. The parison is placed in a mould cavity and inflated with compressed air, taking the shape of the mould.
4. The plastic is cooled and hardened, the mould opens, and the finished part is ejected.
Injection Blow Moulding:
1. A preform, which is a tube-shaped piece of plastic, is injection moulded in a separate machine.
2. The preform is transferred to a blow moulding machine.
3. The preform is heated and placed in a blow mould where compressed air inflates it to the shape of the mould.
4. The plastic is cooled and hardened, and the finished part is ejected.
Stretch Blow Moulding:
1. A preform is injection moulded in a similar way as in injection blow moulding.
2. The preform is transferred to a stretch blow moulding machine.
3. The preform is heated and stretched in both length and diameter to the shape of the mould.
4. Compressed air is then used to blow the plastic to the final shape of the mould.
5. The plastic is cooled and hardened, and the finished part is ejected.
In conclusion, the three types of blow moulding are extrusion blow moulding, injection blow moulding, and stretch blow moulding. Each technique has its own unique process and applications in the manufacturing industry. Extrusion blow moulding is commonly used for producing large containers and bottles, while injection blow moulding is ideal for high-precision parts. Stretch blow moulding is often used in the production of PET bottles for beverages and personal care products. Understanding the differences between these techniques is crucial for choosing the most suitable method for a specific production need.
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