All of our standard machines use material for Screw : biametalic , Barrel : SACM-645/38CRMOALA

We guaranty if new material our screw lifetime 3 years , if recycled material or filler our screw lifetime 1 years

The screw and barrel assembly in a blown film machine serves several important functions.

1. the screw and barrel is responsible for the feeding, melting, mixing, and conveying of the plastic material. The material is fed into the extruder through a hopper, and the screw rotates within the barrel to transport and melt the plastic pellets. As the plastic is conveyed along the screw flights, the heat generated by the barrel and the rotation of the screw causes the material to melt and become homogenized. This melted plastic is then forced through a die to form a continuous tube, which is inflated and cooled to create a blown film.

2. the screw and barrel assembly allows for precise temperature control throughout the extrusion process. The barrel is equipped with heating and cooling zones, which can be adjusted to control the temperature of the plastic along the length of the barrel. This ensures that the plastic is heated to the appropriate melting temperature and cooled sufficiently to maintain its desired properties during the blown film process.

3. the design and geometry of the screw flights play a crucial role in creating the desired characteristics of the blown film. By adjusting the screw configuration, operators can control the mixing and homogenization of different polymer materials, additives, or colorants. This helps to ensure that the blown film has consistent quality and properties throughout its structure.

4. the screw and barrel assembly in a blown film machine also facilitates the control of the output rate or throughput of the extruder. By adjusting the rotational speed of the screw and the melt pressure in the extruder, operators can control the thickness and width of the blown film, thus controlling the production rate.

Overall, the screw and barrel assembly in a blown film machine is a critical component that provides feeding, melting, mixing, temperature control, and output control during the blown film extrusion process. It plays a vital role in achieving the desired properties, thickness, and quality of the blown film.