Tire tread mold designs are becoming increasingly complex and cleaning of tire molds poses a consistent challenge within the industry to reduce maintenance cost and to simplify the cleaning processes. Today’s technologies such as CO2 blasting, ultrasonic wet processing and/or laser cleaning are mainly applied to remove rubber contamination from the surface of tire molds. Cleaning the surface alone however is not sufficient. With todays mold complexity, the air venting system plays a key role in tire mold cleaning. Mechanical vents such as spring vents, or puzzle molds aka ventless molds become clogged with rubber and require a time-consuming disassembly – cleaning – reassembly process. 

Avonisys has tested a variety of different cleaning processes in order to qualify a suitable process to deal in particular with rubber contamination removal from molds with micro-gaps, such as the Ventless Twin Shell ® mold or an assembled puzzle mold. We have identified a robust process that can efficiently remove vulcanised rubber contamination from micro gaps in molds.

    Effective removal of vulcanised rubber from micro-slots

    Highly suitable for cleaning of Ventless Twin Shell ® molds

Cleaning of the micro-gaps in a Ventless Twin Shell ® mold

1)  New Mold

Visual impression of an aluminum Ventless Twin Shell ® mold tread insert with micro surface connection slots.

    Aluminum tread shell

    Micro surface connection slots

2)  After Curing Cycles

For a cleaning test, clogging of the micro slots was provoked by various non-standard curing cycles.

    Slots clogged several mm deep

    Low viscosity rubber

3)  After Cleaning

Complete removal of all contamination from the mold surface and from all of the micro gaps in the mold.

✔︎    Slots fully cleaned

✔︎    Simple and reliable process

Complete removal of all vulcanisation contamination from micro-gaps

= as new !