PVC pipe fittings manufacturers _ sea Widex (certified) _PVC fittings provided by Widex Qingdao Rubber Material Co. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is specialized in "PVC profiles, seals, ABS extruded profiles, PVC raw material" of the enterprise, the company adhering to the "honesty, hard service" concept, for You provide the highest quality products and services. Welcome to inquire! Contact: Zhao Shuang. pvc pipe drying process conditions: usually do not require drying. Melting temperature: 185 ~ 205C. Mold temperature: 20 ~ 50C. Injection pressure: can be as large 1500bar holding pressure: 1000bar injection speed can be as large: To avoid material degradation, the general use of injection speed considerably. Runners and Gates: All conventional gate can be used. If the processing of smaller components, it is best to use the tip gate or sneak into the gate; for thicker parts, it is best to use the fan gate. The minimum diameter of the needle-type gate or sneak into the gate should be 1mm; fan gate thickness not less than 1mm. Typical uses: water supply pipe PVC pipe fittings, household pipes, house siding PVC pipe fittings, business machine housings, electronics packaging, medical equipment, food packaging. A method of emulsion polymerization method, the first industrial production of PVC. In the emulsion polymerization, the addition of water and vinyl chloride monomer, but also the alkyl sulfonate surfactant as emulsifier, the monomer is dispersed in an aqueous phase from an emulsion, or a water-soluble potassium persulfate ammonium persulfate as the initiator, you can also use "oxidation - reduction" trigger system, a different course and suspension polymerization. There are also added polyvinyl alcohol as emulsion stabilizers, dodecyl mercaptan as regulator, sodium bicarbonate as a buffer. There batch polymerization process, semi-continuous and continuous process of three. Latex-like polymerization product, the emulsion particle diameter of 0.05 ~ 2μm, can be applied directly or by spray drying into a powder resin. Emulsion polymerization method cycle is short, easier to control, resulting in a high molecular weight resin, more uniform degree of polymerization, suitable for PVC paste, made of artificial leather or impregnated products. Emulsion polymerization recipe complex, higher product impurities. Bulk polymerization polymerization apparatus is special, mainly by vertical pre-polymerization reactor and stirrer with a frame composed of horizontal polymerization reactor. Polymerization in two stages. Monomer and initiator to the polymerization vessel in the pre-prepolymer 1h, the seed particles are generated, then the conversion rate of 8% to 10%, and then flows into the second polymerization reactor, the monomer and the prepolymer supplemented with an equal volume of to continue the polymerization. Pending conversion rate of 85% ~ 90% PVC pipe fittings supply, exhaust the residual monomer PVC pipe factory, and then crushed and sieved to obtain the finished product. Resin particle size and particle shape is controlled by the stirring speed, reaction heat from the monomer reflux condenser out. This production process is simple, good product quality, production costs are lower.