Ejection System of an Injection Mold

Murali K

12 Aug, 2018 04:53 PM

Ejection is a process of removing the plastic material from the mold.

This are of different types to remove the material from mold.

EJECTION TECHNIQUES:
• PIN EJECTOR:
• Simplest and most economical method .
• Location and number of ejector pins depends on component shape and size.
D-SHAPED EJECTOR PIN :
• Flat sided ejected pin.
• Made by machining of flat on standard ejected pin.
• BLADE EJECTOR :
• Basically a rectangular ejector pin.
• Slender parts such as ribs are ejected by this method.

• SLEEVE EJECTOR:
• Molding by means of hallow ejector pin or sleeve.
• Ejections of small cylindrical Molding.
• Provide positive ejector around a local core pin in forming and hole in the mold.
• VALVE EJECTOR :
• Large diameter ejector pin.
• Used for ejections of large component.
• Ejector applies ejector force on to the inside surface of the molding
• AIR EJECTOR:
• Ejector force is supplied by compressed air.
• STRIPPER BAR EJECTOR:
• Ejector element pushes against the bottom at the molding.
• Effective area of ejection is greater.
• Suitable for walled box type moldings.
• STRIPPER PLATE EJECTOR:
• Mold adopted for ejecting circular box moldings with thin wall sections.

1. Step 1: Ejection System of an Injection Mold

   Ejection is a process of removing the plastic material from the mold.

   
   

   This are of different types to remove the material from mold.

   EJECTION TECHNIQUES:

   ·        PIN EJECTOR:

   ·        Simplest and most economical method .

   ·        Location and number of ejector pins depends on component shape and size.

   D-SHAPED EJECTOR PIN :

   ·        Flat sided ejected pin.

   ·        Made by machining of flat on standard ejected pin.

   ·        BLADE EJECTOR :

   ·        Basically a rectangular ejector pin.

   ·        Slender parts such as ribs are ejected by this method.

   ·        SLEEVE EJECTOR:

   ·        Molding by means of hallow ejector pin or sleeve.

   ·        Ejections of small cylindrical Molding.

   ·        Provide positive ejector around a local core pin in forming and hole in the mold.

   ·        VALVE EJECTOR :

   ·        Large diameter ejector pin.

   ·        Used for ejections of large component.

   ·        Ejector applies ejector force on to the inside surface of the molding

   ·        AIR EJECTOR:

   ·        Ejector force is supplied by compressed air.

   ·        STRIPPER BAR EJECTOR:

   ·        Ejector element pushes against the bottom at the molding.

   ·        Effective area of ejection is greater.

   ·        Suitable for walled box type moldings.

   ·        STRIPPER PLATE EJECTOR:

   ·        Mold adopted for ejecting circular box moldings with thin wall sections.