Injection molding machine screw barrel troubleshooting table

Not cutting

Screw break

New screw

Hopper rack "bridge"

Collapse the "bridge"

Feed tube feed section temperature is too high

Reset the feed section temperature to ensure smooth operation of the water ring

The size of the crushed material is too large

Re-break the raw material, change the design of the feed inlet of the material tube (inner wall groove, do eccentric milling), deepen the depth of the screw groove

Product yellowing has black spots

Screw tube wear

Change the corresponding screw or tube according to the wear condition

Screw assembly has a dead angle

Re-replace the corresponding special screw or three small pieces

The screw is carbonized by the raw material

Use a screw material with better corrosion resistance

The nozzle hole is too small

Re-drill the nozzle hole

Screw compression ratio is too large

Change the corresponding compression ratio screw

Screw temperature is too high

Screw core is cooled deep hole

Poor plasticization of the product

The raw material cannot be fully melted in the screw

Increase the temperature of the tube, using a separate screw

Uneven color mixing

Screw mixing is not good

High mixing screw

The end of the glue is unstable

The gap between the left and right aprons is too large

Re-replace the apron with small clearance

The rubber ring and the meson are not well matched.

Rings and mesons with good outer diameter and end face perpendicularity

Over the gap between the apron and the tube

Replace the corresponding wear parts

Feed pipe and flange contact points are easy to leak

The ends of the tube and the flange are not tightly attached

Overhaul the length of the inner and outer stops of the two workpieces

The end face of the flange and the outer stop are not vertical

Overhaul the verticality of the inner and outer stops and end faces of the two workpieces

Screw or tube is not strong enough

Use 12.9 screws, use the adjustable material tube, the outer diameter of the tube

Screw backlash difficulty

The feed section temperature is too high; the crushed material is too large; the shell pressure is set too large; the barrel feed section is set unreasonably; the Screw Barrel gap is too small

Set reasonable parameters; re-break smaller materials; replace the new screw barrel with too large gap; design a reasonable feed port

Products have bubbles

The back pressure is too low; the compression ratio is too small; the rate of fire is too slow, and the mold temperature is not high;

Set reasonable process parameters and choose a screw with a larger compression ratio

The screw has abnormal noise

The material pipe is not assembled; the size of the material of the barrel is too small; the diameter of the screw handle is too small; the straightness of the screw is not good; the screw discharge design is not smooth enough; the debris is dropped into the barrel

Check the size of each file; re-install; take out foreign objects; raw materials with poor fluidity are produced in three small pieces with smooth structure