- The trapezoidal runner is preferred because it is easy to process and design. A full circle runner is acceptable and common and is necessary for some material types. All runner intersections will have an increased radius in the direction of flow and cold plugs will be provided at each intersection. Refer to drawing S3-1 for cold runner design guidelines.
- The design of the edge gate shall be “double chisel” type, which can be easily removed from parts. Refer to drawing S3-2 for edge gate design guidelines.
- Fan gate is usually used to help reduce part warpage or maintain flatness. Refer to drawing s3-3 for fan gate design guidelines.
4. Sub-gate designs vary, so they should be treated according to the specific situation. Refer to drawing s3-4 for auxiliary gate design guidelines.
5. Tunnel (“cashew “) gates can only be used for specific material types. Refer to drawing s3-5 for the design guide of the cashew nut gate.
- Runner shut-off inserts shall be DME “Mrs” type. When the DME “Mrs” type is not available, refer to drawing s5-6 for another custom design.
- If nozzle cleaning of the press is required, the system will be designed so that the parting line is accessible to the s.h.c.s. to remove the hot runner system plate assembly as shown in drawing s3-7. The guide pin must be longer than the nozzle tip to protect the nozzle head during assembly/disassembly of the “hot half”.
- PinPoint gates need to be designed so that they can be break off at the desired location. A gate indent (spherical radius detail) is required to leave “carrot” marks on the surface of the part. See drawing s3-8 for details.
- The design and position of the sucker pin are very important, and its design largely depends on the specification of plastic material. See drawing s3-9 for details.
