PVC cable due to different production facilities are mainly the following four ways:
       1, two-roll mill pelletizing: raw materials ingredients → → → mixer → high speed mixer two-roll mill cooling tank → drying → → → screening magnetic pelletizer → metering → ​​packaging.
       2, a single-screw extruder granulation: raw materials ingredients → → → high speed mixer cooling mixer → single screw extruder → eagerly head → cooled metering → ​​→ → screening magnetic separation package.
       3, two-stage extruder (first twin-screw extruder, second single screw extruder) Granulation: raw materials ingredients → → → high speed mixer cooling mixer → Two-stage extruder → eagerly head → Air-cooled metering → ​​→ → screening magnetic separation package.
       4, twin-screw extruder granulation: raw materials ingredients → → → cooling mixer speed mixer twin-screw extruder → → → screening eagerly cooled magnetic head → → → metering package.

Specific process:

       1, two-roll mill pelletizing production process
       (1) Preparation: a colorant, a filler were sieved with a 80 mesh screen, and the plasticizer were added to the impregnating a three-roll mill or colloid milled and set aside. Stabilizers, antioxidants, fillers and plasticizers are added in small amounts, stirring the slurry into a paste, and then with a three-roll mill or a colloid milling, the slurry particle size less than 0.050mm, and has been heated with stirring to 90 ℃, spare. PVC resin is sieved with a 60 mesh screen.
       (2) kneading: 0.2MPa was introduced into a high speed mixer for heating steam, into the PVC resin, mixed well and then slowly added to the polishing slurry, the resin will be substantially absorbed before adding fillers plasticizers, coloring agents, the material was when the expansion loose powder discharge, this time the material temperature at about 110 ℃. The whole process takes about 5 to 10 minutes.
       (3) mixing: steam pressure 0.3 ~ 0.4MPa, air pressure 0.5MPa, mixing time of 3 to 5 minutes, tied to lift the number on the top 2 or 3 times, dense materials to Make dough into small pieces, no powder when unloading.
       (4) two-roll mill: steam pressure 0.4 ~ 0.5MPa, roll temperature 160 ~ 170 ℃ (insulation material temperature should be higher) to feed completely after plasticized evenly, with a film thickness of 3mm, the discharge sheet should plasticizing uniform, tough and smooth, no raw materials.
       (5) Cooling: water cooling countercurrent immersion tank, a blower to remove the moisture adhered on the tablet.
       (6) diced: The flat cutter. No cable cut long strips, and even tablets rhomboid phenomenon.
       (7) Packing: by screening magnetic separation, after weighing and packing.

       2, ordinary single-screw extruder granulation production process

       (1) Preparation: a stabilizer, a filler, a coloring agent were sieved with a 80 mesh screen, and the plasticizer were added to the impregnating a three-roll mill or a colloid mill grinding. After weighing spare. Plasticizer mixture evenly preheated 90 ℃ stand; resin with 60 mesh sieve.
       (2) kneading: into PVC resin, a plasticizer and then stirring the mixture, until the basic resin to absorb the plasticizer, stabilizer is added, the material temperature by friction heat to rise to about 90 ℃, added fillers, coloring agents the material, the melt temperature was raised to 110 ℃, the material discharged into the cooling mixer cooling to 45 ~ 50 ℃ below.
       (3) extrusion granulator: extruder (with SJ-120/20, for example) temperature is 80 ℃, 120 ℃, 160 ℃, 170 ℃, head 165 ℃ (when less plasticizer added, the temperature increase about 5 ~ 10 ℃); extruder screw speed of 10 to 30 rev / min; filter head 80 mesh, 120 mesh of each layer; air-cooled using air pressure 0.07MPa (544mmHg), the air volume 2250m3 / h power 7.5kw the centrifugal fan.
       (4) Packing: by screening magnetic separation, after weighing and packing.

       3, twin-screw extruder granulation production process

       (A) preparation and kneading process with a single screw extruder granulation process.
       (2) extrusion granulation: body temperature of 130 ~ 150 ℃; head temperature 140 ~ 186 ℃; host speed of 5 to 15 rev / min.
       (3) Packing: by screening magnetic separation, after weighing and packing.

       4, two-stage extruder granulation production process

       (A) preparation and kneading process with a single screw extruder granulation process.
       (2) extrusion granulation: Two-stage extruder consists of two parts, the first order for the high-speed co-rotating twin-screw mixer, second-order low-speed single-screw extruder, the two orthogonally arranged vertically, constitute two-stage composite unit; will combine with twin-screw and single screw complementary advantages. Twin-screw compulsory delivery, high shear mixing plastics dispersion, inorganic head backpressure reflux, avoiding high shear overheating; single screw extruder high voltage, but low-speed low shear, also avoid overheating contradiction. Particularly suitable for processing PVC and other heat-sensitive materials. Twin screw processing temperature of 150 ~ 185 ℃, single screw temperature 130 ~ 165 ℃. Air-cooled grinding grain fervent way, pellets after cyclone shaker into the silo.
       (3) Packing: by screening magnetic separation, after weighing and packing.

       PVC cable actual production, the flexibility to mix and match depending on the equipment and on-site conditions, the key is to ensure that the formula is accurate, full uniform mixing of materials, plastic is good. Because the cable is also molded molding heated again, so the temperature of the granulation is not too high.

       At present, many cable production, in order to facilitate easy, type and quantity of abrasive materials has decreased, not even grind directly mixed use, often result in some quality issues.