Challenge

In tire manufacturing, achieving consistent product quality during curing and vulcanization is a complex challenge. One of the key factors affecting the process is the initial temperature of the “green tire”—the uncured tire before it undergoes vulcanization.

Ambient temperature variations, caused by seasonal changes or daily fluctuations, significantly influence the temperature of green tires before they enter the curing press. However, traditional curing processes rely on fixed curing times that do not account for these variations.

As a result, tires may become:

  • overcured, leading to material degradation and reduced flexibility
  • undercured, resulting in poor structural integrity and lower durability

These inconsistencies compromise safety, increase scrap rates, and reduce overall production efficiency.

Solution

Infrared (IR) temperature measurement provides an advanced, non-contact solution for optimizing tire curing processes.

By integrating infrared sensors—such as the Optris CTlaser LT—into the production line, manufacturers can measure the surface temperature of each green tire before curing. This real-time data is transmitted to a programmable logic controller (PLC), which dynamically adjusts curing time based on actual temperature conditions.

Unlike traditional fixed-time approaches, this method ensures that every tire undergoes the optimal vulcanization process, regardless of environmental variations.

Understanding Tire Vulcanization

Tire production begins with assembling various rubber components into a green tire. At this stage, the tire has its shape but lacks the mechanical strength required for operation.

Vulcanization is the final and critical step in tire manufacturing. During this process:

  • the tire is placed in a mold
  • heat (approximately 200°C) and pressure are applied
  • chemical reactions transform rubber into a durable, elastic material

The process is governed by three key parameters:

  • temperature
  • pressure
  • time

Precise control of these factors is essential to ensure the tire achieves its intended performance, durability, and safety characteristics.

How Infrared Monitoring Works

Infrared sensors are positioned to measure the surface temperature of green tires before they enter the curing press.

Rubber materials naturally have high emissivity, making them ideal for infrared temperature measurement. Sensors operating in the appropriate spectral range can therefore deliver highly accurate readings.

Once measured, the temperature data is transmitted via a standard industrial signal (e.g., 4–20 mA) to a PLC system. An algorithm calculates the optimal curing time based on the tire’s initial temperature.

This dynamic adjustment ensures:

  • consistent curing conditions for each tire
  • elimination of overcooking and undercooking
  • precise control of the vulcanization process

Additionally, features such as laser targeting assist with accurate sensor alignment and measurement positioning.

Benefits

Implementing infrared monitoring in tire curing delivers measurable improvements:

  • Consistent curing despite ambient temperature fluctuations
  • Reduced scrap rates caused by defective tires
  • Increased production output through optimized cycle times
  • Improved tire quality and uniformity across batches
  • Enhanced energy efficiency by avoiding unnecessary heating

Technology Advantages

Modern infrared sensors offer several advantages for tire manufacturing:

  • Non-contact measurement, eliminating wear and maintenance
  • High accuracy, even in variable environmental conditions
  • Fast response times for real-time process control
  • Compatibility with rubber materials due to high emissivity
  • Easy integration into existing production systems

Efficiency and Process Optimization

By replacing fixed curing times with temperature-driven control, manufacturers gain greater flexibility and precision.

Real-time monitoring allows immediate adjustments, reducing variability and ensuring consistent results. Over time, collected data supports process optimization, predictive maintenance, and improved production planning.

This data-driven approach leads to:

  • lower production costs
  • higher throughput

improved resource utilization

Enhancing Tire Quality and Safety

As safety standards and performance expectations continue to rise, tire manufacturers must ensure consistent and reliable production processes.

Infrared temperature monitoring provides a modern solution for controlling vulcanization with precision. By adapting curing time to real conditions, manufacturers can produce higher-quality tires with improved durability and performance.

With infrared technology, tire production becomes more efficient, more consistent, and better aligned with the demands of today’s automotive industry.