Compared with the conical superposition head, under the same conditions, the structure of the plane superposition head is compact, its actual height is only 60% of the conical superposition head, in the seven and nine layers of co-extruded film blowing unit, the effective height of the tower is improved, this head has absolute advantages;
Industry insiders know that in the process of multi-layer extrusion blowing film, LDPE and PA plasticization temperature difference is very big, can only be the independent heating head, conical superposition head surface can be independent heating, but some careful analysis is not appropriate, through the profile, the cylinder is relatively independent, but the conical part is inserted into another layer of the cylinder, theoretically affected by another layer of heating temperature, in addition, In the long production process, the heat conduction of the metal will interfere with the temperature of each cone layer and tend to be uniform. To ensure the temperature difference between two adjacent materials, insulation must be added. This design philosophy is evident in the flat overlay nose.
Because the flat superposition machine head adopts side feed, the internal flow channel of the machine head is less inflection point, no dead point, and stop and start frequently will never have a paste, especially when blowing nylon, its advantages are unmatched. This design theory of the nose has gone beyond traditional ideas and is a theoretical leap.