How to adjust the temperature of a three-layer co extrusion blown film machine

The three-layer co extrusion blown film machine is an efficient, stable, and reliable production equipment that provides important support and guarantee for the development and product improvement of the plastic film industry. With the continuous advancement of technology and the growing market demand, three-layer co extrusion blown film machines will play a more important role in the future, providing strong technical support for industry innovation and product upgrades.

Different plastic materials require different temperatures during the extrusion process. For example, the extrusion temperature of polyethylene is generally between 160-220 ℃, while the extrusion temperature of polypropylene is between 180-260 ℃. At the co extrusion die, the temperature also needs to be precisely controlled to ensure that the three-layer melt can converge and extrude well. Excessive temperature may cause plastic decomposition, while insufficient temperature may result in incomplete plasticization of the plastic, affecting the quality of the film.

How to adjust the temperature of a three-layer co extrusion blown film machine

The first thing to adjust is the temperature of the upper, middle, and lower plasticizing cylinders, which play a crucial role in extruding plastic film. Generally speaking, the temperature of the upper plasticizing barrel should be slightly higher than that of the middle and lower layers to ensure that the plastic material is fully melted when passing through the plasticizing barrel. Normally, the temperature of the upper plasticizing cylinder can be set between 180-220 degrees Celsius, while the temperature of the middle and lower layers is 160-200 degrees Celsius.

Secondly, the temperature control of the extrusion nozzle directly affects the extrusion speed and uniformity of the film. Generally speaking, the temperature of the extruder mouth should be slightly higher than the temperature of the plasticizing barrel, which can make the extruded plastic film more uniform. Normally, the temperature of the extrusion nozzle can be set between 200-240 degrees Celsius.

In the process of adjusting the temperature, it is necessary to continuously experiment and adjust according to the specific requirements and production process of the film. In practical operation, the temperature can be precisely adjusted through a computer control system or manually adjusted. The key is to determine the appropriate temperature range based on production needs and actual conditions, and adjust the temperature of each component according to the actual situation to ensure the production of stable quality plastic film products.

The three-layer co extrusion blown film machine is an equipment used for producing multi-layer plastic films. Its working principle is to plasticize three different plastic raw materials through independent extruders, merge them at a mold head, and then form a thin film through processes such as blowing and cooling. These three types of plastic materials form a three-layer structure in the film, with each layer having its specific function. For example, the outer layer may have good printing adaptability and wear resistance, the middle layer may provide barrier properties, and the inner layer may have good heat sealing properties.

The three-layer co extrusion blown film machine has the advantages of high production efficiency, low production cost, and stable product quality. By adjusting the extrusion speed, pressure, and temperature of the extruder, films of different thicknesses and materials can be produced. At the same time, the three-layer co extrusion blown film machine adopts advanced control technology and automated production system, which can achieve fully automatic production, reduce manual intervention, and improve production efficiency and quality.