The three-layer co extrusion blown film machine is an advanced plastic film production equipment. It has the following characteristics: advantages of multi-layer structure: through three-layer co extrusion technology, materials with different properties can be combined together to achieve multifunctional thin film products. For example, the outer layer can have good weather resistance and printability, the middle layer ensures strength and barrier properties, and the inner layer meets performance requirements such as heat sealing.

What are the types of die heads for three-layer co extrusion blown film machines?

There are several types of die heads for three-layer co extrusion blown film machines:

Flat overlay die: The melt flows symmetrically along the central axis on the overlay surface of each layer, instead of the traditional cylindrical flow. Its advantage is that the number of layers of the machine head can be arbitrarily combined, the structure is simple, and the temperature of each layer can be individually controlled.

Cone superimposed die head: Adopting a conical modular modular structure, each unit is composed of a pair of short conical modules, and the flow channel is on the conical cylindrical surface. This type of die head is divided into upper oblique overlay type and lower oblique overlay type. The upper oblique conical overlay type is mainly used for die heads with a diameter of 10mm-50mm, while the lower oblique conical overlay type is suitable for larger co extrusion heads.

Radial stacking die head: The flow channel is a spiral core rod type, characterized by a low center, and the height of the die head will not increase with the increase of layers. Due to the fact that the pressure of the melt is balanced in the circumferential direction of the flow channel, the sealing is better than that of the stacked type. But the disadvantage is that the temperature of the melt cannot be controlled separately, especially the temperature of the intermediate layer.

The three-layer co extrusion blown film machine is widely used in various fields, such as food packaging, daily necessities packaging, industrial packaging, etc., to meet the diverse needs of different industries for film performance. Efficient production: With high production efficiency, it can quickly produce a large number of films that meet the requirements. Progressiveness technology: advanced control system, such as computer automatic control, is used to facilitate operation and monitoring of the entire production process.

Structurally, it mainly includes extrusion system, die head, wind ring, traction device, winding device, and other parts. The extrusion system is responsible for heating, melting, and extruding different plastic raw materials; The die head causes the extruded material to form tubular film bubbles; Wind rings are used for cooling and regulating film bubbles; The traction device stretches the film and guides it to the winding device for winding.