What is the process of blowing machine?

Full analysis of the process flow of plastic film blowing machine: precise manufacturing from particles to films

The film blowing machine (Blowing Machine) is the core equipment for plastic film production and is widely used in packaging, agriculture, medical and other fields. This article will introduce the working principle, process flow, key technologies and industry applications of the film blowing machine in detail to help you fully understand this efficient film manufacturing technology.

I. Working principle of film blowing machine

The film blowing machine processes plastic particles (such as LDPE, LLDPE, HDPE, PP, etc.) into plastic films of different thicknesses and widths through extrusion, blowing, cooling, pulling, winding and other processes. Its core lies in melt extrusion + airflow expansion molding, which is mainly divided into flat extrusion blowing method (TUBULAR) and down blowing method (INFLATION).

Main components of film blowing machine

II. Complete process flow of film blowing machine

1. Raw material pretreatment

Drying treatment: Some hygroscopic materials (such as PA, PET) need to be dried in advance to prevent bubble formation.
Compounding modification: Add functional additives such as masterbatch, UV inhibitor, antistatic agent, etc.

2. Melt extrusion

Plastic particles enter the extruder and melt at a high temperature of 150-250℃. The screw rotates to push the molten plastic forward and build up a pressure of 15-30MPa

3. Die molding

The molten plastic passes through the circular die to form a tubular film bubble.

Key parameters: die gap (0.8-2.0mm), temperature control (accuracy ±1℃).

4. Film blowing and cooling

Inject compressed air into the film bubble to expand it (film blowing ratio 2:1~4:1).

Air ring cooling: cold air blows evenly to the film bubble to quickly shape it.

5. Traction and thickness measurement

The traction roller stretches the film at a constant speed to control the thickness (accuracy ±0.01mm).
Online thickness gauge (such as beta ray or infrared sensor) monitors the thickness uniformity in real time.

6. Winding and slitting

The automatic winder adopts constant tension control to prevent film deformation.

The slitting machine cuts different widths according to customer needs.

III. Key technologies of film blowing machines

1. Multi-layer co-extrusion technology (Co-extruding)

ABA, ABC and other structures, for example:
Outer layer (printing layer)
Middle layer (barrier layer, such as EVOH)
Inner layer (heat sealing layer)

Advantages: Improve film strength, barrier properties, and reduce costs.

2. Intelligent control system

Automatic air volume adjustment: stabilize the shape of the film bubble
Thickness closed-loop control: reduce material waste
Remote monitoring (IoT): real-time adjustment of process parameters

3. Energy-saving technology

Frequency conversion drive: reduce energy consumption by 20-30%
Waste heat recovery: use the waste heat of the extruder to preheat the raw materials

Xinye film blowing extruder manufacturers provide high-performance film blowing solutions. With multi-layer co-extrusion technology, intelligent control systems and advanced energy-saving technologies, they ensure uniform film thickness (±0.1mm), efficient and stable production (energy consumption reduced by 10-30%, output increased by 20-50%), and support flexible customization of 800mm-2300mm. This equipment is widely used in food packaging, agricultural film, industrial film and shopping bags, etc., meeting the diverse needs of high barrier, high strength and low cost.

IV. Application fields of film blowing machine

Conclusion

As the core equipment for plastic film manufacturing, the process optimization of film blowing machine directly affects the film quality and production cost. With the development of technologies such as multi-layer co-extrusion and intelligent control, film blowing machine is developing towards high efficiency, low energy consumption and high precision.

As a manufacturer specializing in the production of film blowing bag making machines, we focus on the intelligent production of film blowing machines, reduce dependence on workers' skills and manpower, monitor the production line in real time, and provide customers with customized production equipment. If you are still hesitant and don't know how to make a choice, contact us and tell us your needs. We will tailor-make specialized equipment for you.