Fuzhou barrel screw injection molding machine parts sales professional screw barrel

Fuzhou relationship barrel screw injection molding machine barrel screw fittings 0591-83534582 professional sales materials and several special projects between the screw: PMMA (plexiglass) features: ① glass transition temperature 105 ℃, melting temperature greater than 160 ℃, decomposition temperature of 270 ℃, forming a wide temperature range. ② viscosity, poor mobility, better thermal stability. ③ highly absorbent. Preferences a. L / D aspect ratio of graded screw taken 20 to 22, the precision requirements are generally molded article which L1 = 40%, L2 = 4%. Epoxy grout 0311.8927-6098 b. Compression ratio ε, generally select from 2.3 to 2.6. c. For which there is a certain hydrophilic, so the use of the screw in the front end of the mixing ring structure. d. Other parameters can be generally universal screw design and barrel gap is not too small. PET (polyester) Features: ① melting point of 250 ℃ ~ 260 ℃, blow molding grade PET molding temperature is a little wider, about 255 ℃ ~ 290 ℃. ② PET blow molding grade high viscosity, temperature effect on viscosity, thermal stability. Preferences ①L / D generally take 20, three sections of the distribution of L1 = 50% -55%, L2 = 20%. ② low shear, low compression ratio of the screw, the compression ratio ε, and generally 1.8 to 2, while the shear overheating cause discoloration or opaque h3 = 0.09D. ③ mixing screw tip does not ring, to prevent overheating, hidden material. ④ because this material is more sensitive to temperature, and many manufacturers use recycled materials in general, is to increase production, using low-shear screw, it may be appropriate to increase the motor speed to achieve their goals. While the use of recycled materials used (mostly flakes), according to the actual situation, to increase the transmission capacity of the feed zone, has taken to increase the blanking aperture in the barrel in the slot, etc., and achieved good results .