submarine gate

submarine gate

[¦səb·mə′rēn ′gāt]
(engineering)
An edge gate with the opening from the runner into the mold positioned below the printing line or mold surface.
References in periodicals archive ?
An angled, conically shaped tunnel gate, also known as a subgate or submarine gate, is one of the best--and worst--types of gating methods.
Mold design will be examined in detail, including the design process and information gathering, parting line considerations, overflow considerations, part feeding (sprues, ring feed, pin feed, tab feed and submarine gate), cavity spacing, mold construction (mold plates, core pin/inserts, leader pins/bushings, material selection, durability and spring assists), compression molds, transfer molds, injection molds, injection-transfer, and additional topics, including CAD in mold design and cold runner blocks.
For parts injected in a more conventional sprue such as a submarine gate or cone gate, small diameter feeds are typically preferred for the low-viscosity LSR materials.
After pre-compression to between 29,000 and 36,000 psi using a special needle shutoff nozzle, the parts filled in 40-50 millisec through a submarine gate.
Mold design will be explored, including the design process and information gathering; parting line considerations; overflow considerations; part feeding (sprues, ring feed, pin feed, tab feed and submarine gate); cavity spacing; mold construction (mold plates, core pin/inserts, leader pins/bushings, materials selection, durability and spring assists); compression molds; transfer molds; injection molds; injection-transfer; and miscellaneous topics such as CAD, in-mold design and cold runner blocks.
For parts injected in a more conventional sprue, such as a submarine gate or cone gate, small diameter feeds are typically preferred for the low-viscosity LSR materials.
The quality and appearance of the gate vestige are said to be comparable to what was previously possible only with a submarine gate. Also, parts reportedly can be filled using considerably lower pressures than previously required.
It is synchronized through an interlocking system to work with a traversing picker-and-pin or submarine gate molder.
The current mold had 0.050" (1.27 mm) diameter submarine gates and a 0.180" (4.57 mm) diameter nozzle on the press with a 0.300" (7.62 mm) diameter at the top of the cold sprue (see Table 2).
Burn-vector or side-sparking electrodes are used to spark undercuts within moulds, including those needed for submarine gates, or to avoid any possibility of a collision when sparking the base of a deep rib or similar feature.
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