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Šta je injekcija plastike-02

Time: 2021-08-18 Pogodaka: 4

Injection molding machine has two basic components: injection device and clamping device for melting and feeding plastic into mold. The function of the clamping device is to:


1. Close the mold under the injection pressure;


2. Take the product out of the injection device, melt the plastic before it is injected into the mold, and then control the pressure and speed to inject the melted plastic into the mold.


There are two designs of injection devices used today: screw type

pre plasticizer or two-stage device, and reciprocating screw. The screw type pre plasticizer uses the pre plasticizing screw (first stage) and then injects the molten plastic into the injection rod (second stage).


The advantages of screw pre plasticizer are constant melt mass, high pressure and high speed, and accurate injection volume control (using mechanical thrust devices at both ends of piston stroke). These advantages are needed for transparent, thin-walled products and high production rate. Its disadvantages include uneven residence time (leading to material degradation), high equipment costs and maintenance costs.


The most commonly used reciprocating screw injection device does not need a plunger to melt and inject the plastic.


The types of injection molding machines are vertical, horizontal and all electric, but no matter which type of injection molding machine, its basic functions are two:


(1) Heating the plastic to a molten state;


(2) High pressure is applied to the molten plastic to make it shoot out and fill the mold cavity.

Prethodna: nijedan

Sledeće: Šta je injekcija plastike-01