Analysis of the factors leading to unsuccessful injection molding of two-color injection molds

Two-color injection mold in the process of use will appear in the form of failure, such as plastic deformation failure, plastic mold fracture, cavity surface wear and corrosion, etc., that cause failure of what are the reasons? The following two-color mold manufacturers to provide a specific introduction.

First, plastic deformation failure causes

(1) two-color injection molding using materials of insufficient material strength and toughness, deformation resistance is low.

(2) The hardening layer on the surface of the plastic mold cavity is too thin, and the deformation resistance is insufficient or the working temperature is higher than the tempering temperature for phase change softening.

Second, the plastic mold fracture reasons

By the temperature difference generated by the structural stress, thermal stress or due to insufficient tempering, the use of temperature, residual austenite into martensite, resulting in local volume expansion, in the two-color injection mold internal tissue stress caused by.

Third, the cavity surface wear and corrosion causes

(1) The enhanced resin filler in the plastic will produce scouring, wear and corrosion on the surface of the mold cavity.

(2) At the same time, plastic processing containing chlorine, fluorine and other components of the thermal decomposition of corrosive gases HCl, HF.

(3) The plastic melt flows in the mold cavity with a certain pressure, and the solidified plastic parts are taken out from the mold, which will cause friction to the mold forming surface and cause abrasion.

The above is the analysis of what are the reasons for the failure of two-color injection molds introduced by the two-color mold manufacturer, I hope it can provide reference for you.