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Do you have any understanding of mold heads?
Do you know about the die head of the extrusion compound machine?
Let's learn about the sharp tools of packaging and printing composite production lines&# 8217; Automatic die head+floating die head
The so-called floating automatic die head refers to the repeated movement of the die head in the transverse direction, changing the position of the die head in the transverse direction of the composite film. The edge position of the extrusion film is automatically adjusted to maintain stable edge position, thus achieving a flat surface for coil winding, and the surface of the coil can be as flat as the biaxial stretching BOPP film! At the same time, it does not increase the loss of leftover materials.
Multi layer extrusion composite core technology - floating automatic die head! Extruded composite coil material is produced by extrusion of high-temperature molten resin through a flat die head, followed by bonding and cooling with the substrate (or paper), edge cutting and winding. The surface smoothness of the composite product winding coil is one of the key technical indicators for extrusion composite quality. The uneven surface of the coil material will directly lead to the scrapping of the composite product! And the movable automatic die head can ensure the flatness of the surface of the coil material. Biaxially stretched substrate films (such as BOPP, BOPETI, and cast (CPP, CPE), produced using thickness measurement and automatic flat die heads, can achieve good surface flatness. However, extrusion composites also use thickness measurement and automatic die heads, which cannot solve the surface flatness of the coil.
Movable die head
Edge loss: Stable edge, cutting 10-20mm (when extruding LDPE), same as traditional
Surface flatness of the coil material: There is no concavity or convexity, and the appearance is close to the level of BOPP, exceeding the level of CPP and CPE. The extrusion layer is thick and there is no concavity or convexity.
Automatic die head
Edge loss: Stable trimming 10-20mm (when extruding LDPE)
Surface flatness of coil material:
There are obvious bumps and bumps, and the surface smoothness and appearance are much worse than those of cast CPP. The thicker the extrusion layer, the more severe the accumulation of bumps and bumps.
