One of the key moments in the life of a mold for plastic injection molding is maintenance. It can occur due to malfunctions or breakdowns, but at Stamplast, we prefer to avoid these extremes, which can lead to unforeseen issues and obstacles in the production process. We focus instead on preventive and planned maintenance. This is discussed in this video featuring the workshop manager Denis De Donà and the operator Arben Elezaj.

“Mold maintenance within our department,” explains De Donà, “is done by an operator with the help of a mold washing machine to clean impurities and dirt attachments inside the tool to ensure a longer life and better durability of the mold. It is determined by cycle counters, experience, and a number of shots that have been established within the production process department.”

The Cleaning Phases

Arben Elezaj describes the activity: “We open the mold in two, separating the matrix part from the punch part. We start cleaning from the punch side, open the back of the mold and remove the punch to also clean it inside and to change the o-ring seals where the water cooling phase in the mold goes. The cleaning of the punch surface is done with a bit of alcohol because usually the pieces that are molded create dust around the punch.”

“The shiny part is delicate,” he adds, “so you should not scratch it with sandpaper, you have to use our paste. It’s a paste suitable for polishing the shiny part. Even the ejectors are important to clean because they create dirt, gas. When we have finished the mold cleaning procedure, of the punch and the matrix, we come to the moment of closing the mold.”

The Mold Returns to Production

At the end of the cleaning, as De Donà explains, “the request for periodic maintenance made by the molding department is closed and the mold is either stored inside the warehouse, if it does not have an imminent production, or sent back to the production department for the continuation of batches or the production it was doing.”