Demolding Issue

Describe

Plastic components that undergo demolding deformation, rupture, or breakage may deform due to excessive force or adverse forces applied during the ejection process. After removing the part from the mold, the ejector will leave obvious marks on the surface of the molded part, such as dents or protrusions, gloss

Difference or whitening discoloration (stress-induced whitening). Demolding issues may cause material breakage or fracture.

Reason: There are too few ejector pins in the demolding system, the position is incorrect, or the surface is too small.

Suggestion:

Optimize the shape of the injector system.

Reason: The selected mold is too small or the surface structure smoothness (texture) used does not match the draft mold.

Suggestion:

• Increase the draft angle.

Reason: Due to excessive holding pressure, the mold is excessively held during the filling process.

Suggestion:

Adjust the switching point to switch to holding pressure before reaching the filling level of the mold volume (filling progress is about 98%)

Pressure.

Reduce the holding pressure and establish a decreasing holding pressure curve.

Reason: Due to excessive shrinkage, the material shrinks too much towards the core direction, making it more difficult to remove from the mold.

Suggestion:

• Increase the holding pressure, and if applicable, use the holding pressure curve.

Reason: The selected cooling time is too short.

Suggestion:

Extend the cooling time.

Reason: The actual mold temperature is too low.

Suggestion:

Raise the mold temperature.

Reason: During the removal from the mold, a vacuum is generated between the molded part and the mold surface.

Suggestion:

By incorporating channels, parting lines, or special inserts into the mold, the exhaust of the mold inserts can be improved. When the mold is opened, air can flow between the mold and the cavity through these channels, parting lines, or special inserts.