: injection troubleshooter :

machine

· injection pressure too low
· injection hold pressure time too short
· overall cycle too short
· back flow valve cracked
· excessive cylinder clearance
· heater bands burned out

mould

· too hot
· gates too small (related to inadequate pressures)
· gating in the wrong place
· mould too small

material

· verify if it is the required material

1st

increase injection pressure

2nd

increase cooling time

3rd

increase mould temperature

4th

maintain uniform cycle time operation

5th

check machine for erratic operation

6th

check the percentage regrind to virgin material

7th

increase gate size

8th

reduce gate land length

9th

relocate gate if glass-filled compounds

10th

balance runner and/or gate system

11th

reduce number of cavities to balanced system