技術資訊

INJECTION PROBLEMS :
SURFACE MELT FLOW LINE
SOLUTION:
1 . TOO HIGH MELTING POINT.
2 . ADJUST INJECTION SPEED.
3 . ENLARGE INLET SIZE.
4 . MATERIAL NOT DRY ENOUGH.
5 . INCREASE MOLD TEMP.
6 . CHANGE INLET POSITION.



INJECTION PROBLEMS :
MOLD STRIP DIFFICULTY
SOLUTION:
1 . DECREASE INJECTION PRESSURE.
2 . DECREASE HOLDING PRESSURE TIME.
3 . INCREASE COOLING TIME.
4 . CHECK MOLD TEMP.
5 . MOLD SURFACE TOO SMOOTH.
6 . USE MOLD RELEASE AGENT.
7 . INCREASE SLOPE OF EJECTOR PIN.
8 . CHECK RESIN SHIRNKAGE RATE AND MOLD SPEC.
INJECTION PROBLEMS :
CONNECTION
LINE
SOLUTION:
1 . INCREASE INJECTION SPEED.
2 . ADJUST MELTING TEMP.
3 . ENLARGE INLET SIZE OR CHANGE INLET POSITION.
4 . SET AIR HOLE.
5 . REMOVE CONNECTION OF FRONT COLD RESIN.
INJECTION PROBLEMS :
NOZZLE
DRIPPING MELT MATERIAL
SOLUTION:
1 . DECREASE MELTING TEMP.
2 . DECREASE NOZZLE TEMP.
3 . DCREASE BACK PRESSURE.
4 . DELAY TIME OF STRIPPING GATE'S COLD RESIN.


INJECTION PROBLEMS :
PRODUCT INDENTATION
SOLUTION:
1 . DECREASE INJECTION TEMP.
2 . INCREASE HOLDING PRESSURE.
3 . INCREASE INJECTION PRESSURE.
4 . DECREASE MELTING TEMP.
5 . CHECK LENGTH OF RESIN MEASURMENT AREA.
6 . DECREASE MOLD LOCKING PRESSURE & INCREASE EXHAUST.
INJECTION PROBLEMS :
WARPAGE
SOLUTION:
1 . BALANCE MOLD TEMP.
2 . CHECK INJECTION PRESSURE.
3 . DECREASE INJECTION SPEED.
4 . CHANGE INLET POSITION.
5 . CHECK MOLD LOCKING PRESSURE.


INJECTION PROBLEMS :
RESIN NOT FULL IN THE MOLD
SOLUTION:
1 . INCREASE MATERIAL SUPPLY.
2 . INCREASE INJECTION PRESSURE TIME.
3 . INCREASE MELTING TEMP.
4 . ENLARGE MOLD GATE, SPRUE, INLET.
5 . USE BIGGER INJECTION MACHINE.
6 . CHECK SCREW HEAD.
7 . .INCREASE MATERIAL M.F.I.


INJECTION PROBLEMS :
TOUGHNESS
NOT ENOUGH
SOLUTION:
1 . MELTING TEMP. IS TOO LOW OR TOO HIGH.
2 . MATERIAL NOT DRY ENOUGH.
3 . DECREASE RECYCLE MATERIAL RATIO.
4 . CHECK CONTAMINATION.
5 . MATERIAL REMAIN TOO LONG TIME IN THE SCREW.
6 . USE TOUGHNESS AGENT TO IMPROVE PHYSICAL PROPERTY.

INJECTION PROBLEMS :
BURNED
SOLUTION:
1 . DECREASE INJECTION SPEED.
2 . ADJUST MELTING TEMP.
3 . SET AIR HOLE.

INJECTION PROBLEMS :
SCREW CANNOT ROLL
SOLUTION:
1 . INCREASE MELTING TEMP.
2 . DECREASE BACK PRESSURE.
3 . FILL UP PROPER GREASE.
4 . STOP MACHINE & CHECK IF ANY FOREIGN STUFF.

PVC GRADES
(DOP CONTENTS)
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
SHOREA 100 98 96 94 92 89 85 83 79 76 72 69 66 64 60 58 55
SHORED 78 75 67 60 53 48 42 37 34 30 27 24 22 24 18 15 14

bar
Mpa psi kg/cm2 N/mm2
1 0.1 14.5 1 0.1
10 1 145 10 1
0.07 0.007 1 0.07 0.007