PVC plastic extruder extruding process: raw materials formula, sieving, weighing, high speed hot mix, cold mix - sieve - storage - at low speed wind send - extrusion, finalize the design - traction - film, cutting, inspection, warehousing

1. Single-screw PVC extruder production: the formula of PVC is granulated by single-screw extruder first, and then extruded by single-screw extruder using pellets as transport materials in the second step. (this method is adopted by manufacturers of PVC sealing strips and partial sex) this method has low efficiency and low yield. Suitable for small batch production.

2. Production of double-screw PVC extruder: the first step is to pre-mix the ingredients (hot mix and cold mix) so that the mixture can achieve better dispersion and pre-brush effect, and at the same time obtain higher apparent density. The second part is to use the twin screw machine with the premix for direct extrusion profiles. Suitable for mass production.

Mixing system includes thermal mixing cold mixing system, is a kind of high-speed mixing unit, heat mixing pot and cold mixing pot is equipped with the import and export and airtight container, internal agitator motor drive, purpose is greatly components dispersion and mixing, cooling mixing pot wall generally equipped with circulation cooling water system to strengthen the cooling through, improve the production rate; The volume of the cold mixing pan is at least twice that of the hot mixing pan. The larger volume is on the opposite side, which is conducive to the dispersing of hot mixing in the cooling process. The raw material that passes hot mix and cold mix is called dry mix makings, to dry mix makings the most basic requirement is the stability between batch of dry mix makings is good and even, the dry mix that does not boil does not boil makings (be like hot mix insufficient or overmuch), adjust through the technology of extruder forehead is very difficult to produce good product.