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System Selection Guide
56
To select a Hot Runner System to match your part and material specifications consideration must
be given to the following:
• Gate type
• Gate size
• Nozzle range and series
• Nozzle tip style
• Nozzle nut type
Additional Considerations
Additional Considerations
Selecting Material
There are three broad categories of materials each relating to its moulding characteristics:
• Easy
• Medium
• Difficult
When selecting material consider the following:
• Materials with large percentages of filler (for example, >15%) or very low MFI, the material classification moves up a grade (for
example, easy to medium).
Selecting a Gate Type
When designing an injection mould, the type, size and location of the gate is one of the most important consideration
for correct moulding of the part. Incorrect gate position can result in uneven filling, over packing, and dimensional
instability.
Available gate types include:
• Direct gating
• Valve gating
Direct gating is the most common gate type as it offers simple construction and reliability.
Refer to the Nozzle Section for more information about Gate Types
The following factors must be considered when selecting a gate type:
• Shot size of part
• Material to be moulded
• Material
• Viscosity
• Additives
• Glass fibre
• Flame retardant
• Gate surface finish
• Thickness of part walls
• Longest flow length of part
• Required cycle time
Summary of Contents for Hot Half System
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