Reliable Solutions for Harsh Environments and Critical Precision

Steam and condensate networks in tyre plants are large, complex and energy-intensive, but they also represent major opportunities for savings. Where improvements are integrated without altering curing performance, plants reduce waste, cut fuel demand and stabilise operations across the site.

Each part of the process has its own challenges:

• Curing presses produce heavy condensate loads, particularly in large dome presses where steam is in direct contact with the rubber. This increases the risk of condensate contamination. Stable condensate removal is critical, and carefully engineered recovery can provide hot water for site utilities without disturbing curing cycles.
• Tyre presses often produce tyres of different sizes, creating varying loads depending on tyre size and curing profile. Additional load occurs when presses are changed over, as more energy is required to heat the press metal. GEM Steam Traps are proven to manage these challenges effectively.
• Bladders pressurise the mould with hot water, steam or nitrogen. In hot water systems, depressurisation releases flash steam to atmosphere, representing a major recovery opportunity if reclaimed without back pressure that affects curing stability.
• Mixers and extrusion lines are continuous steam and hot water users where even small efficiency gains accumulate to significant site wide savings when waste heat is recovered and reused.

Curing steam in autoclaves is rarely clean. Rubber, grease and other particles carried in the flow foul mechanical traps quickly, either forcing them open and wasting live steam or blocking them and backing up condensate. Both outcomes are disruptive: unstable press temperatures, off-spec tyres, and unplanned downtime.

GEM steam traps are engineered for these conditions. With no moving parts and a patented multi-stage internal filtration system, they maintain continuous condensate removal even in dirty streams. This keeps curing pressures stable and protects product quality. At one major rubber processing plant, replacing more than 250 failed traps eliminated blockages entirely, held curing within one degree, and cut maintenance interventions from hours to minutes.

Presses run on tight temperature profiles, where even a 0.5°C deviation can disrupt curing and risks rework or extended curing cycle. Waterlogging from inconsistent condensate removal is a frequent cause, reducing heat transfer and destabilising curing surfaces. The result is costly scrap, downtime to reset the press, and pressure on quality teams to explain failures.

By draining condensate continuously, GEM steam traps keep curing surfaces stable and protect product integrity. This approach reduced steam use per cure by more than 10%, achieved payback in under six months, and maintained consistent curing stability across dozens of different presses.

Keeping mechanical traps in service demands constant attention. Surveys, cleaning and replacements consume hours of skilled labour, while blocked or failed traps bring presses offline at high cost. In plants running continuous operations, this cycle of maintenance and disruption is a familiar drain on time and resources.

GEM traps remove that burden. They have no moving parts to fail, can be serviced in place within minutes, and require no internal replacements. The results of a GEM steam trap retrofit project at an off-road tyre manufacturer included reduced boiler load, shortened curing times and increased production capacity, generating more than £135,000 in annual savings while cutting maintenance to a fraction of previous levels.

Curing presses and bladders release large amounts of recoverable heat, yet in most plants this is vented to atmosphere for fear of disturbing curing stability.

• Boiler and CHP exhausts, along with flash steam from bladder water release, represent major efficiency opportunities that can be safely reclaimed for boiler feedwater, combustion air, hot water or space heating.
• Tyre curing’s reliance on medium to high pressure steam creates further potential for flash steam recovery, provided systems are correctly engineered to avoid back pressure or altered temperature profiles.

When recovery systems are properly engineered, this energy can be reclaimed and reused without impacting curing performance.