The key role of spiral groove design in extrusion blown film is reflected in its multi-faceted mechanism to promote the mixing effect. First of all, through the design of the spiral groove, the screw can effectively disperse and push the fed solid plastic particles to the mixing area, avoiding accumulation between particles and laying the foundation for subsequent processing. Secondly, the shape and depth of the spiral groove cause frictional heat to be generated when the screw rotates, which helps to heat and melt the plastic particles, achieving the transition from solid to extrudable melt. This also reduces the temperature difference between particles and promotes uniform mixing.
The existence of the spiral groove not only expands the surface area of the screw, allowing more plastic particles to contact the screw, but also effectively enhances the contact between particles through its shape design, promoting heat transfer and improving the mixing effect. This design helps ensure that the plastic particles are fully melted in the mixing area to form a uniform melt, providing uniform and stable raw materials for the subsequent extrusion process.
In general, the spiral groove design synergistically acts on the extrusion film blowing process to improve the mixing effect through multiple mechanisms such as dispersing particles, generating frictional heat, expanding the contact area, and effectively melting. This is of great significance to ensure the consistency of film quality and performance, and provides key support for the normal operation of the extrusion film blowing machine and the production of high-quality films.