Page 10 - Injection Molding Advanced Troubleshooting Guide
P. 10
Contents XI
6 Mold Texture and Polish .................................... 47
6.1 Mold Texture ................................................ 47
6.2 Mold Polish ................................................. 50
7 Venting .................................................... 53
7.1 Venting Basics ............................................... 53
7.2 Alternate Venting ............................................ 58
7.3 Venting Conclusion ........................................... 60
8 Machine Performance ...................................... 61
8.1 Load Sensitivity .............................................. 63
8.2 Dynamic Check Valve Study ................................... 64
8.3 Velocity Linearity ............................................ 65
8.4 10-Cycle Overlay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.5 Cycle Variation .............................................. 70
8.6 Velocity to Pressure Transfer ................................... 72
8.6.1 Machine Control ...................................... 75
8.7 Machine Documentation ....................................... 78
9 Drying ..................................................... 81
9.1 Introduction ................................................. 81
9.2 Keys to Drying ............................................... 81
9.2.1 Temperature .......................................... 83
9.2.2 Dry Air .............................................. 83
9.2.3 Air Flow ............................................. 85
9.2.4 Time ................................................ 85
9.3 Moisture Analysis ............................................ 86
9.4 Material Handling ............................................ 88
9.5 Material Concerns ............................................ 90
10 Purging .................................................... 91
10.1 Purging Impact .............................................. 91
10.2 Purging Method Example ...................................... 92
10.3 Purging Compounds .......................................... 93
