Spear System

About the Spear System

The spear has a double heater structure consisting of a tip heater and a body heater.
The spear tip has been modified to directly heat itself.
There are a large variety of spears available to accommodate different resin types and applications.

Principle and Features of the Spear System

Spear probe has long service life because of its thermal valve principle having no sliding part.
The resin at the sprue and runner is kept molten to maintain constant fluidity. Depending on the temperature of the gate land and a die, a very small amount of the resin solidifies along with the resin inside of the cavity.
After the molded product is removed, the spear tip is heated up to instantly melt the solidified resin at the gate land just before the next injection.

Overall structure of the Spear System

Spear System consists of a spear (embedded into the die)

Spear System line-up

Series G

  • External heating system contributes to a high injection rate.
  • Suitable for multi colored products.
  • Suitable for Super engineering plastics.


Series D

  • Suitable for a wide range of the molding operations from small products to large products.
  • Suitable for multiple cavity moldings.
  • Suitable for general engineering plastic.


Series SPT

  • The newly-developed external heating topless probe is equipped with a tip heater.
  • It is best suited for molding high-function plastics for extremely-small mechanical parts.
  • It can be used for multiple cavity mold as well, taking advantage of its compactness of minimum 7mm pitch.
  • Unlike a conventional block method, gate lay out can be arranged flexibly.
  • Applicable to small parts molding, as small as using 15t machine.


Series ESN

  • Minimum resin content and first-in first-out flow path prevents the resins from deterioration and contamination.
  • Tip replacement between several types is available to suit to the resin.


Series ESXL

  • Specifically for side gating.
  • Best suited to medical parts.


Series SI

  • Multiple tip style; cluster of 8, 12, or 16 tips on one block body.
  • Close pitch (15 mm) can be processed.
  • Multiple cavity molding can be easily processed.


Materials are available for download.
If you have any other questions about the product, please feel free to contact us from the inquiry form.