How to Solve the Problem of Unstable Film Bubble of Blown Film Machine？

In the production process of plastic films, Blown Film Machines play a vital role. The stability of the film bubble has a direct impact on final product quality, production efficiency and energy consumption. However, film bubble instability is a common technical problem during the operation of the blown film machine.

Analysis of the causes of membrane bubble instability:

1. Temperature and pressure fluctuations:

During the film blowing process, the temperature of the molten plastic and the pressure of the blowing air are key factors affecting the stability of the film bubble. Fluctuations in temperature will cause changes in the fluidity and viscosity of the plastic, while fluctuations in pressure directly affect the shape and stability of the film bubble.

2. Die head design and installation:

The geometry, opening size and installation accuracy of the die head will all affect the formation and stability of the film bubble. Inappropriate die design or improper installation can cause vibration, deflection or rupture of the film bubble.

3. Raw material characteristics:

The melt index, uniformity, impurity content and other characteristics of plastic raw materials have an important impact on the stability of the film bubble. Low-quality raw materials may cause instability in the membrane bubble.

4. Operating parameters:

Unreasonable settings such as the rotation speed, traction speed, air volume and other operating parameters of the film blowing machine may also lead to unstable film bubbles.

Professional solutions:

1. Optimize temperature and pressure control:
An advanced temperature and pressure monitoring system is introduced to monitor the temperature of the molten plastic and the pressure of the blowing air in real time to ensure that they fluctuate within the optimal range.
Use high-precision temperature and pressure sensors to improve the response speed and accuracy of the control system. The entire range of Chaoxin's blown film machines use Omron temperature sensors imported from Japan, and use SSR solid-state electrical and integrated control to ensure extremely high accuracy and extremely low failure rates.
According to different raw materials and film thickness, the control parameters of temperature and pressure are optimized to obtain the best film blowing effect.

2. Improve die design and installation:
Optimize die geometry and opening size to accommodate different raw materials and film thickness requirements.
Improve the processing accuracy and installation quality of the die head to ensure that the die head matches other parts of the blown film machine well. The die head of Chaoxin Machinery is processed by the world's top CNC machine tools, with precise and smooth die head flow channels to ensure the raw material extrusion effect.
Regularly inspect and maintain the die head, and promptly replace seriously worn die heads.

3. Strictly control the quality of raw materials:

Select high-quality plastic raw materials to ensure that melt index, uniformity, impurity content and other characteristics meet production requirements. It is recommended to choose products from first-line petroleum raw material manufacturers.
During the storage and transportation of raw materials, effective measures should be taken to prevent the raw materials from getting damp, contaminated or deteriorating.
During the production process, raw materials are regularly inspected for quality to ensure stable raw material quality.

4. Optimize operating parameters:

According to the characteristics of raw materials, film thickness and product quality requirements, the operating parameters such as rotation speed, traction speed and air volume of the film blowing machine are optimized.
Introduce an automated control system to realize automatic adjustment and optimization of operating parameters, improving production efficiency and product quality.

Chaoxin has equipped all series of products with automatic control systems. Through the visual PLC operation screen, it can accurately control operating parameters, simplify the operation process, and effectively improve productivity.

Film bubble instability is a common technical problem in the production process of blown film machines, but this problem can be effectively solved by optimizing temperature and pressure control, improving die design and installation, strictly controlling raw material quality, and optimizing operating parameters. In the actual production process, these solutions need to be flexibly applied according to specific conditions, and continuous exploration and innovation are needed to improve the stability and production efficiency of the blown film machine. At the same time, strengthening equipment maintenance and management to ensure long-term stable operation of the blown film machine is also the key to solving the problem of unstable film bubbles.