Purging Material for injection molding machine (Plastic purging agent)
- Daicel Miraizu

Why it works? [Characteristics of Celpurge]

Effect seen from [Characteristic of Celpurge]

Easily discharge preceding material
due to interfacial tension

Celpurge controls wettability

It is effective to use the resin with higher viscosity than the preceding material for most efficient purging. It’s about the resin flushing through the flow path.

Due to cylinder and screw inner wall of the molding machine, it is more effective to use interfacial tension than viscosity.

For example, if water or oil is placed on a frying pan that has been treated with a fluororesin, it will play like a ball and prevent the food from burning, that’s the theory had been applied.

The Celpurge contains a surfactant. By controlling the interfacial tension between the preceding or subsequent material and the cylinder / screw metal surface, the contact angle θ can be increased to change the preceding material. Discharge smoothly.

Smooth discharge due to interfacial tension

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Excellent in self-discharge

Full spreading over the screw

The purge agent must coating all the screw and cylinder in order to flush out the original resin from the cylinder.

Celpurge is designed to roll around the surface of the screw and the screw surface by the unique rheology control technology, so it spreads over the entire screw.

Rolling around

Cylinder / Screw

Compatibility is important to prevent resin from remaining.

Even if you use normal resin, the resin near the metal wall will not be easily discharged.The surfactant contained in Celpurge makes the contact angle θ is big when discharging the preceding material. But when charging with the subsequent material, it plays a role to discharge Celpurge itself.

Celpurge will fully spreading in the cylinder/screw surface because the surfactant is between the Celpurge and the metal surface of the cylinder/screw (interface).
Even if you use normal resin, the resin near the metal wall will not be easily discharged.

Even if you use normal resin, the resin near the metal wall will not be easily discharged.

Hot runner cleaning

The resin remaining in the dead space is also removed
No residue is remaining

Due to the structure of the hot runner, there is a dead space where the resin tends to stay.

Celpurg is not a viscous type of purging agent, but a type of interfacial tension controlling purging agent.

Hot runner cleaning

Please select the hot runner compatible grade.

Celpurge for hot runner (with audio)

For those who want to know more in detail

Reference materials

“Plastics for molding machine cleaning that expand the applicable range”(JP) 

Effect of resin viscosity and polarity on normal resin color changeover process
/ The Japan Society of Polymer Processing

Technical report “Color change of hot runner mold by resin with surfactant”

A quick overview of hot runner cleaning concepts.

Technical report “Influence of resin viscosity and polarity on color change process of molding machine”

The experimental results of purging between PP and AS resin were shown and interpreted based on the concept of ​​wettability.

Technical Report “A Study on Behavior of Material Replacement during Molding”

We interpreted the normal color change of resin with the idea of ​​wettability.