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Home » Plastic molding » injection molding runner components of mold part

injection molding runner components of mold part

July 16, 2019 by mechanicaleng blog 1 Comment

In this post I will explain injection molding runner components of mold part. There are 4 main items of runner components: runner lock pin, runner lock pin lock, runner lock pin bushing, ejector runner. It is different functions between the two mold plate and three plate mold, but there are several components that can be used in general without looking at the type of mold construction.

3 plate injection molding runner components
3 plate injection molding runner components

Post contents

  • 1. injection molding runner lock pin
  • 2. Injection molding runner lock pin lock
  • 3. Bushing runner lock pin
  • 4. Ejector runner

1. injection molding runner lock pin

runner lock pin shape
runner lock pin shape

Runner lock pin have undercut shape at end of pin. When injection mold open, this undercut will pull runner, this force will cut gate from product. Runner lock pin does not move during the injection process. Mold base plate moves accordance with the mold opening sequence, the tip of the runner lock pin is the part that greatly affects the success or failure of the gate runner cutting process.

2. Injection molding runner lock pin lock

Runner lock pin lock have function to maintain runner lock pin order not to loose from its position. There are various ways to lock them runner lock pin
+ Closed with a locating ring or sprue bush or heat insulation board.
+ Using a plate
+ Use a screw plug

3. Bushing runner lock pin

High cycle time mold or need durability are advised to use the bushing,the benefits include easy maintenance of runner lock pin, more resistant to wear due to friction so it’s can avoid direct contact between Runner lock pin and mold plate that can caused wears, this method will shorten maintenance time.

4. Ejector runner

Use to push runner out of the mold.

Related posts:

three plate mold constructionPlastic injection molding three plate mold three plate mold constructionConstruction injection mold classification Default Thumbnailejector system in injection molding injection molding processPlastic injection molding process steps

Filed Under: Plastic molding Tagged With: plastic injection molding

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