Plates Requirement
Manifold and Back Plate Material
• High strength material must be used for the plates.
• Minimum plate material is 1.2311/1.2312, 30HRC, 800MPa Yield Strength.
• High strength material must be used for the plates.
• Minimum plate material is 1.2311/1.2312, 30HRC, 800MPa Yield Strength.
Manifold and Back Plate Thickness
• The minimum recommended back plate thickness is 40mm which should increase as plate sizes increase.
• The minimum manifold plate material required below the nozzle head is 30mm. The material below the nozzle head
should increase as the manifold pocket size increases to ensure system rigidity.
• The minimum recommended back plate thickness is 40mm which should increase as plate sizes increase.
• The minimum manifold plate material required below the nozzle head is 30mm. The material below the nozzle head
should increase as the manifold pocket size increases to ensure system rigidity.
Clamping
• Sufficient clamping between the back plate and manifold plate is required to prevent the plates from being forced apart through thermal expansion of the hot runner system and to resist injection pressure.
• A minimum of 2 bolts per drop positioned as close to the drop positions as possible.
High tensile grade bolts (12.9) must be used and sized according the system size.
• Sufficient clamping between the back plate and manifold plate is required to prevent the plates from being forced apart through thermal expansion of the hot runner system and to resist injection pressure.
• A minimum of 2 bolts per drop positioned as close to the drop positions as possible.
High tensile grade bolts (12.9) must be used and sized according the system size.
Minimum Plate Size
• Sufficient material is required around the manifold pocket (Dimension A) to ensure the rigidity of the system.
• 75mm of material around the pocket is required to give sufficient space for bolts, wire slots, guide pillars. This also maintains the system strength.
• Sufficient material is required around the manifold pocket (Dimension A) to ensure the rigidity of the system.
• 75mm of material around the pocket is required to give sufficient space for bolts, wire slots, guide pillars. This also maintains the system strength.
Central Supports
• To ensure rigidity of large systems - pillars may be required through the manifold to provide additional
bolting close to the sprue bush.
• These integral supports reduce the risk of back plate bowing over large cavity pockets, or the hot runner system forcing the plates apart due to thermal expansion.
• To ensure rigidity of large systems - pillars may be required through the manifold to provide additional
bolting close to the sprue bush.
• These integral supports reduce the risk of back plate bowing over large cavity pockets, or the hot runner system forcing the plates apart due to thermal expansion.
Venting
• Vent slots must be machined into the manifold plate to ensure any moisture from condensation is released from the
manifold pocket and nozzle detail.
• 1mm x 16mm slots are recommended as depicted in the diagram below.
• Vent slots must be machined into the manifold plate to ensure any moisture from condensation is released from the
manifold pocket and nozzle detail.
• 1mm x 16mm slots are recommended as depicted in the diagram below.
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