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1、Molding Guide d Zytel nylon resin Start with DuPont Table of Contents Chapter 1 Page Chapter 6 Page General Information . 2 Composition and Properties. 2 Physical Form . 2 Containers . 2 Chapter 2 The Injection Molding Process . 4 Processing Characteristics. 4 Melting or Softening Temperature . 4 En
2、ergy Requirements . 4 Melt Viscosity . 4 Stability and Behavior at Melt Temperature . 5 Cycle Time . 5 Shrinkage . 5 Chapter 3 The Injection Molding Machine . 6 Machine Melt Capacity . 6 Screw Design . 6 Nonreturn Valve . 6 Nozzle . 6 Nozzle Shutoff Valve . 6 Hydraulic System . 7 Injection Pressure
3、. 7 Clamping Capacity . 8 Temperature Control. 8 Chapter 4 Machine Operating Conditions . 9 Cylinder Temperature Profile . 9 Melt Temperature. 9 Nozzle Temperature . 9 Injection Pressure . 10 Injection Rate . 11 Screw Forward Time. 11 Overall Cycle. 11 Screw Speed. 11 Back Pressure . 13 Mold Tempera
4、ture . 13 Start-Up. 13 Shutdown. 14 Purging . 14 Chapter 5 Handling of Molding Resin . 15 Effects of Moisture and Contamination on Molding Resin. 15 Handling Regrind . 16 Drying . 17 How To Obtain Optimum Toughness . 19 Selection of Zytel . 19 Molding Zytel 3189, 408L and ST801 for Toughness . 19 Pa
5、rt Design. 19 Chapter 7 Interrelationship of Part Design, Molding Conditions, Resin Selection and Mold Design . 20 Thickness of Section . 20 Ribs and Strengthening Members . 21 Bosses . 21 Fillets and Radii . 21 Undercuts. 22 Chapter 8 Mold Design . 23 Sprue Bushing . 23 Runner Design . 23 Gate Desi
6、gn . 23 Mold Cooling . 25 Venting . 25 Undercuts. 25 Runnerless MoldsTypes and Terms. 26 Chapter 9 Dimensions . 28 Mold Shrinkage . 28 Post-Mold Shrinkage. 29 Effects of Moisture and Temperature on Dimensions . 29 Dimensional Tolerances . 30 Chapter 10 Quality Control . 34 Resin Specifications . 34 Specifications o
