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SANKO GOSEI

Glossary: What is mold deposit on an injection mold?

Mold Deposits on injection molds are impurities or residues that accumulate on the mold surface during the molding process. These deposits can adversely affect molding quality and cause the following problems


 1.Poor product appearance: Deposits can be transferred to the product surface, resulting

in stained or rough surface areas.


 2.Poor dimensional accuracy: Deposits can accumulate in the mold cavity, causing errors

in the dimensions of the molded product.


 3.Mold malfunction: Deposits on slides and ejector pins can cause the mold to run less smoothly and

affect the molding cycle.

Causes of Mold Deposits


The main causes of mold deposits include


 Material decomposition products: Plastic materials decompose at high temperatures and volatile by-products can adhere to mold surfaces.


 Additive volatilization: Additives (plasticizers, flame retardants, dyes, etc.) contained in plastic materials can volatilize during molding and adhere to molds.


 Lubricant residue: Lubricants used in molding machines can migrate to the mold surface and accumulate as deposits.


External contaminants: Dust and oil from the molding environment can adhere to the mold and form deposits.

Measures to Prevent Mold Deposits


Measures to prevent mold deposits include the following

Regular mold cleaning: Clean molds regularly to remove deposits and prevent buildup.


Material selection: Use of materials that do not degrade easily and additives with low volatility will reduce the occurrence of deposits.


Optimization of molding conditions: Optimizing molding temperatures and cooling times prevents material degradation.

Mold coatings: Special coatings on mold surfaces can prevent deposits from adhering.

These measures will reduce mold deposits and maintain the quality of the molded product.

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