PVC selection of injection molding machine requirements

(1) Can only choose screw Injection Molding Machine , can not choose plunger Injection molding machine .

(2) All parts in contact with PVC plastic are not allowed to produce any adhesion or retention of the plasticized melt; Due to the role of hydrogen chloride, these parts are required to wear and corrosion resistance. It is best to choose equipment made of wear-resistant and corrosion-resistant materials, or choose equipment that is chrome plated or nitrided for these parts.

(3) The temperature control system of the equipment should be clear and sensitive.

(4) The length to diameter ratio of the screw can be small, and the head of the screw is pointed; The compression ratio of the screw is 2-2.5, and the three lengths of the screw can be set to 40%, 40% and 20% respectively.

(5) Select a general nozzle with a large aperture and be equipped with a heating and temperature control device.

(6) The electric heating system adopts closed loop control to strictly control the upper and lower deviation of the material temperature, and it is recommended that the material temperature be controlled at ±15℃, and the nozzle has an independent temperature control system.

(7) The material pipe group should have a certain cooling device, it is recommended to increase the temperature of the material pipe group to equalize the fan.

(8) The material tube as far as possible to avoid friction heat during feeding and injection, such as sharp Angle, mutation and other phenomena

(9) The material tube as far as possible to avoid dead Angle of accumulation, each injection molding must control the accumulation as little as possible

(10) The nozzle is open, not recommended to use the check valve.

(11) Each injection should be as far as possible to take out the residual material at the nozzle, it is recommended to use the specifications of the nozzle

(12) Rod as shown in the figure should be selected: rigid PVC is a heat-sensitive plastic, its slender ratio is recommended to choose 17 ~ 18, screw, nozzle, need to choose anti-corrosion materials for related treatment

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