In injection molding processes, cooling technology is a key factor that directly impacts part quality, cycle times, and energy efficiency. Although it often goes unnoticed compared to variables like injection pressure or resin selection, the mold cooling system can be the difference between a competitive production line and one full of rejections and cost overruns.

In this article, we explore the evolution of cooling technology, the latest innovations being implemented in the industry, and how Plásticos Lezo integrates advanced cooling solutions to optimize processes and reduce waste.

Why is cooling so important in injection molds?

The cooling phase often represents over 50% of the total injection cycle time. An inefficient system can cause:

Unnecessarily long cycle times
Dimensional variations and warping
Internal stresses in the part
Poor surface finish or sink marks
Increased energy consumption and production costs

Conversely, a well-designed cooling technology enables:

Shorter cycle times
Greater dimensional stability
Fewer visual defects
Improved repeatability
Lower thermal and electrical energy usage

Key innovations in cooling technology for molds

The injection molding industry has seen major innovations in recent years. Here are some of the most impactful:

1. Conformal Cooling Channels

Unlike traditional straight-drilled channels, conformal cooling adapts to the part’s geometry. Thanks to additive manufacturing (metal 3D printing), it is possible to create curved channels that follow the shape of the cavity.

Advantages:

More uniform cooling
Cycle time reduction of up to 20–30%
Less warping and better dimensional tolerances

2. In-Cavity Temperature Sensors

Smart molds now incorporate thermal sensors in critical cavity areas, allowing real-time monitoring and automatic coolant flow adjustments.

Advantages:

Prevention of hot spots
Precise quality control
Better process traceability

3. Rapid Heat and Cool Technology (RHCM)

This system alternates between intense heating and cooling cycles. It is especially useful for parts with high aesthetic requirements, like glossy surfaces or weld-line-free finishes.

Advantages:

Smoother and more consistent surfaces
Elimination of visible flow lines
Improved bonding in multi-shot parts

4. Smart Flow and Pressure Control

Modern systems adjust coolant flow and pressure in real time based on each cycle’s conditions. This optimizes cooling without manual intervention.

Advantages:

Energy savings
Lower water consumption
Reduced operational costs

5. Use of Advanced Thermal Fluids

Beyond standard industrial water, more and more manufacturers are using thermal oils or glycol solutions for specific temperature ranges or enhanced conductivity.

Advantages:

Greater thermal stability
Less corrosion in the system
Ideal for technical molds with demanding requirements

How we implement these technologies at Plásticos Lezo

At Plásticos Lezo, we work closely with clients and mold suppliers to implement cooling technology tailored to each project.

Our methods include:

Thermal feasibility studies during the design phase
Cooling flow simulations with CAE software
Selection of thermally conductive mold materials
Evaluation and optimization of cooling channel design
Routine inspection and cleaning to maintain performance

Measurable results

Through cooling system optimization, we have achieved:

Up to 25% cycle time reduction
Lower rejection rates due to thermal deformation
Over 30% energy savings in selected references
Improved surface quality on visible parts

Cooling and sustainability: a direct connection

Cooling technology also contributes directly to environmental goals. Improved thermal efficiency helps:

Lower energy use
Optimize water and fluid consumption
Reduce indirect CO₂ emissions per production cycle

At Plásticos Lezo, we are committed to increasingly responsible production, and smart cooling is a key part of that strategy.

Advancements in cooling technology for injection molds are not a luxury—they are a strategic tool to improve productivity, quality, and sustainability. Investing in efficient cooling is investing in long-term competitiveness.

At Plásticos Lezo, we combine technical experience, innovation, and client focus to implement the best solutions at every stage of the plastic transformation process.

Want to improve the thermal performance of your molds or reduce cycle times?
Contact our technical team and let’s find the best solution for your production process.