Three-layer co-extrusion blown film machines has the advantages of high production efficiency, simple operation, low cost and high membrane quality. It has been widely used in packaging industry. With the development of technology and the increase of market demand, the performance and technology of three-layer co-extrusion blown film machines are constantly improving, which provides more possibilities for producing high-quality film.
Three-layer co-extrusion blown film machines is widely used in food packaging, medical product packaging, agricultural film, building materials film and other fields. The films produced have excellent tensile strength, heat resistance, corrosion resistance and transparency, effectively protect the product, prolong the shelf life of the product and improve the competitiveness of the product.
What are the raw material requirements for three-layer co-extrusion blown film machines?
First, the quality of raw materials is higher. The quality of raw materials directly affects the quality of the extruded film, so it is necessary to choose high-quality raw materials in production. In general, raw materials need to have good ductility, toughness and transparency to ensure tensile strength and light transmittance films.
Secondly, the composition of raw materials should be stable. Three-layer co-extrusion blown film machines usually adopts multi-layer composite material to make the film. Therefore, it is necessary to ensure the balance and stability of each layer of the material to ensure the uniform structure of the extrusion film. If the raw material composition is unstable, it is easy to cause the the extruded film to appear loose, breakage and other quality problems.
Third, the raw material should have good processing performance. Raw material needs to have good processing performance including melt flow index and melt flowability. This ensures the smooth flow of raw materials during extrusion and prevents blockage and leakage, thus producing high-quality films.
Raw material specifications need to match. Three-layer co-extrusion blown film machines usually requires to select suitable raw material specifications including width and thickness according to product requirements. If the raw material specifications do not match, it is easy to the extruded film's size and thickness do not meet requirements.
When adjusting the temperature of a three-layer co-extrusion blown film machine, it is necessary to match the temperature of the upper, middle and lower plastic drum with the extrusion nozzle in order to ensure temperature coordination between the parts, so as to produce high-quality plastic film products. In the course of operation, continuous testing and adjustment are needed to improve production efficiency and product quality by adjusting the temperature according to the actual situation.
A three-layer co-extrusion blown film machine mainly consists of an extruder, die head, coating roller, cooling roller, traction roller roller, tension control system and winding machine. An extruder heats and melts plastic granules, then squeezes them into a film. The mould makes a circular film the extruded plastic material. Coating roller is coated on the cooling roller to cool. The cooling roller adopts cooling system to cool and solidify the film. The traction roller pulls the film to maintain constant speed and tension. The tension control system controls the tension of the traction roller and ensures the uniformity and tension of the film. The coiler rolls the film into a drum for subsequent processing and use.
