A high plastifying effect due to twin screw extruder
This Twin Screw Extruder ,Mixing Single Screw Extruder,Universal extruder, can be manufactured in a simple way because the production of annular recesses in the cylinder and ring beads on the does not create problems and is cost-efficient. A high plastifying effect occurs due to Twin Screw Extruder the fact that the material processed in the is rearranged from the windings to the cylinder recesses where it is subjected to a particularly intensive plastifying treatment by the pins.The pins are located in slanted bores of the cylinder of the, their production requiring considerable less expense than the production of a transfer mix thread in the inner wall of the cylinder, which can be produced only by complicated milling processes, while in the case of the of the invention merely drilling processes are required for producing the bores which receive the pins. Consequently a good conveying effect in the axial direction results. It is possible to mount and dismount the without removing the pins. Pin breakages can not occur, since the tangential pins are restrained and fastened on both sides. The plastifying and conveying effect sheet production extruder is similar to the transfer mix, but the manufacture of the apparatus is considerably less expensive.
From the construction point of view thisan be simply produced and built by imparting a trapezoidal shaped cross section to the annular recess in the cylinder wall; the bead on the core can also have a trapezoidal cross section.
A pair of spaced frame members or brackets 40 are welded to bracket 38 such that frame members or brackets 40 are parallel to the longitudinal axis of bores 31 and 33. Each frame member 40 is generally U-shaped in configuration having a pair of spaced bores 42. A slide member 43, H-shaped in plan view, The output shaft 48 of motor 47 is suitably connected via a coupling 49 to an output shaft 50 which in turn is connected to a feed or vent 51 which is journaled for rotation in sleeve 32. Feed or vent 51 is a double flighted helical which as shown in FIG. 3 has a slight clearance with the internal diameter of sleeve 32. Although there has been described but one vent bore or opening to atmosphere, there may be provided a plurality of such vent openings 32 with correspondinto perform the function of venting gases to atmosphere while returning the mix back into the central chambers or bores 22 and 23 for further mixing.
In the operation of the above describe the PVC material being processed by the mixer moves through the central chambers or bores 22 and 23 of the mixer barrel and is fed by the twin rotors During such working action of the PVC material by the twin rotors 20 and 21, there is significant heating up of the PVC materials due to the shearing forces produced by the rotating twin rotors 20 and 21 which melts the particulate PVC or plastic materials which thereby releases volatile gases and moisture within the chambers or bores 22 and 23. Such gases escape through the pre-set clearance between the rotating vent 51 and the bore 33 that communicates the central chambers with atmosphere. mixing/compounding operation, the quality of the finished product is materially improved in an efficient and cost effective manner. It must be remembered that the entrapped gases lower output as they reduce effective internal volume capacity which lower apparent viscosity of the product thus lowering pumping capacity. Such lowering of capacity can be up to twenty percent of twin screw extruderoutput capacity.