Film gate as
shown in figure 6-19, also known as flash gate, thin film gate like circular
runner, but used in flat edges of plastic parts, it has a flat gate, the gate
width can jumper the whole or part of the cavity cavity edge. Film gate is
suitable for pressing LiSu pieces, and often used in large, flat plastic parts
Film gate F
as shown in figure 6-19, also known as flash gate (flash gate), thin film gate
like circular runner, but used in flat edges of plastic parts, it has a flat
gate, the gate width can jumper the whole or part of the cavity cavity edge.
Film gate is suitable for pressing LiSu pieces, and often used in large, flat
plastic parts, in order to keep the minimum of the warp. Film gate size is
small, the thickness is about 0.25 ~ 0.63 mm, width is about 0.63 mm
6-19
Automatic
removal of gate Automatic removal of gate and mold actions, during ejection
plastic parts cut gate. They are applied to: y avoid removing gate secondary
processing. Y to maintain uniformity of cycle time
Y minimize
gate marks. Automatic removal of gate includes the following types: needle
gate, the latent type gate and hot runner gate, and the valve gate.
(1) needle
gate Pin gate (pin gate) as shown
in figure 6-20, usually applied to three board mould, the runner system located
in a component model online templates, cavity plastic parts meet the main
parting line. The gate with a back taper Angle direction parallel to the
template through the middle template. When open cavity of main parting line,
the small diameter end of the needle gate from plastics tore off, then open the
port can be parting line out port waste. This system can also open port parting
line first, then using assistive devices off port waste. Needle gate used most
often in a single plastic parts more into the water, in order to ensure
symmetrical filling, or shorten the length of flow channel in order to ensure
the parts of the holding operation. The typical needle gate 0.25 ~ 1.6 mm in
diameter.
(2) submarine gate the latent type gate
Latent type gate (submarine gate) or is called the tunnel gate (tunnel gate),
chisel gate (chisel gate), as shown in figure 6-21, used in the two plate mold,
below the parting line, the end of the passage between the cavity and
processing a tilt the cone of the tunnel. Ejection parts and runner, gate will
be separated from the plastic parts. Typical latent type gate is 0.25 ~ 2.0 mm
in diameter, runner from coarse to fine, until become globular endpoint. If
parts of the functional area has the characteristics of large diameter of the
needle, it can be connected to the latent type gate, to reduce processing
costs. If the needle features occur in the hidden surface, also can not remove
him. To multiple submerged in cylinder inside the gate design, can replace the
disk gate, and have the function that automatically remove the gate, to the
periphery of the molded parts roundness than disk gate parts of roundness is
poor, but also can also accept it.
6-20 Pin gate 6-21 Latent type gate
(3) hot runne the hot runner gate The hot
runner gate (Hot - runner gate) or is called thermal probe gate (hot - the
probe gate), as shown in figure6-22, usually from electrothermal vertical sprue
and heat flow transmitted directly melt into the cavity, to produce plastic
parts without a runner. Control the pressure maintaining cycle in plastic parts
near the gate of solidification. When the template is opened, a fairly high
temperature plastic tear from the cavity.
(4) Valve gate valve type gate valve type
gate (Valve gate) as shown in figure 6-23
, in
the hot runner gate increase a needle bar, in order to close the gate before
gate solidification.
It can
be applied in larger gate without gate trace. Because of the holding period is
controlled by needle bar, valve type gate can get better the holding period and
the stable quality of plastic parts.
(5)The side
gate automatic gate design Side of the gate in the general design is not
automatically take off a gate, if the product and the runner design into
different time out, can realize automatic gate effect.
(6) take the bottom gate Take the
bottom side gate of gate of improvement, products suitable for a particular
shape. 1), in the case of side gate is not permitted.
2) and
avoid the fluxion phenomenon; Backoff delay needle
3) in
addition to the hard PVC, suitable for most of the products.
(7)The
fan gate The fan gate is the improved side gate, its width increases with the
decrease of depth. 1), suitable for large flat type shape products
2), the
plastic into the cavity is flat, reduce the production flow and clamp water
lines.
3),
suitable for any except hard PVC plastic,
more information www.chinamoldmaker.org www.cnmoulding.com
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