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8/13/2010

Different types of gate for injection m…

Injection Mold Making
I llustrated guide for mold makers

Different types of gate for injection molding
Posted on December 30, 2005 by Elito

If you're new here, you may want to subscribe to my RSS feed. In some cases, you will need to install a feed reader to your browser to make this work. Thanks for visiting! The narrow and shallow portion of the runner as it enters the cavity is called the gate. Listed here are the different types of gate with their characteristics. Sprue and runner are described here. Side gate: This is the most commonly used gate type and is commonly used for mold structures with 2 or more cavities. It is placed at the side of the plastic product. The gate has to be cut manually by a cutter.

Submarine gate: The positioning of this gate is flexible thoughout the sides of the plastic product. It can be placed on the fixed or movable side of the mold but the design has to be thought about carefully so that the product will not be left inside the fixed cavity. The gate automatically cuts itself as the mold opens.

Fan gate: It is commonly used for large and flat plate products. It is placed at the side of the product – same as the side gate. The gate has to be cut manually by a cutter.

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8/13/2010

Different types of gate for injection m…

Film gate: Similar to fan gate except that it is commonly used for thin and flat plate products.

Pin gate: This is possible for molding multiple cavities or parts. The gate positioning is relatively flexible at the top side of the product. The runner layout is very flexible as well. The mold base structure is complicated because it uses a 3-plate method.

Banana gate: This is not a very common gate. It is used when the visible surface of the product requires no trace of the gate. The gate automatically cuts itself as the mold opens.

Direct gate: The sprue serves as the gate. It is...