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Solutions
Heating Cooling Ventilation Energy Supply & Storage Systems Engineering & Plant Optimization

Heat Recovery Industrial heat pumps Combined heat and power plant Refrigeration systems Rent a refrigeration unit Container Refrigeration Systems Mobile refrigeration unit Ventilation Systems Cleanroom Technology Ice storage Battery storage Compressed air systems Cooling water Cooling Water Treatment Temperature control technology Energy-Efficient Machine Optimization

Heat Recovery

Our heat recovery systems are used worldwide by customers across a wide range of industries. This not only helps customers reduce their energy costs but also makes a significant contribution to reducing their environmental impact. Find out more—free of charge and with no obligation—about the possibilities for utilizing waste heat in your business!

Industrial heat pumps

Industrial heat pumps offer businesses an efficient solution for heating and process heat—especially when waste heat is used as a heat source and the goal is to reduce energy costs.

Combined heat and power plant

As a system supplier, ONI-Wärmetrafo GmbH offers you a wide range of services from a single source. This includes the integration of an existing CHP plant or the design of a new one. We have already completed numerous projects involving combined heat and power plants and would be happy to present you with a system solution tailored to your needs and based on our experience.

Energy-efficient cooling systems tailored to your needs

Let our experts advise you and schedule a no-obligation consultation today. We look forward to designing a system for you.

Rental refrigeration systems / Rental chillers

Do you need additional capacity on short notice, or are you planning a renovation that requires a flexible cooling solution? Then get in touch with us!

Container Refrigeration Systems

Demand for modular energy centers has risen rapidly in recent years. The reasons for this trend can certainly be found in the quick availability, flexibility, and space-saving design of these high-performance ONI systems. From cooling and chilled water to heating and compressed air supply—including pumps, tanks, and control units—the entire system is arranged in a compact, space-saving manner within modular units.

Refrigeration Equipment & Technology

A reliable and energy-efficient supply of cooling water for production is a top priority for any business. That is why more and more companies around the world are choosing our energy-optimized and highly reliable cooling system technology

Highly efficient ventilation systems and room air conditioning systems

Our ventilation systems and room air conditioning systems feature state-of-the-art technology and meet the highest standards for efficiency and reliability.

Cleanroom Technology

The need for a cleanroom environment, where exposure to airborne solid or liquid particles is minimized, usually stems from product-specific or hygiene requirements. The range of industry-specific requirements is broad, and the associated system engineering is correspondingly complex.

Ice storage

Almost every industrial facility generates waste heat. Use our heat recovery systems to harness this energy for heating your offices, factory floors, and much more.

Battery storage in a container

A container-based battery storage system is a scalable storage solution that ensures flexible access to electrical energy during operations.

Compressed air systems

A reliable and efficient compressed air supply is a top priority for industrial companies. In this context, “reliable” also means generating and supplying compressed air in the quality and quantity required for production processes, machinery, and equipment.

Cooling water for industrial facilities

Cooling water in industrial systems: hydraulics, standards, operational and process safety, and energy efficiency in the recirculation cooling loop with ONI-PowerSave.

Cooling Water Treatment for Industrial Facilities

Cooling water treatment for reliable cooling systems: Stabilize water quality; reduce corrosion and scale buildup.

Temperature Control Technology with Rhytemper®

Optimal manufacturing process. The unit costs of die-cast and injection-molded parts are largely determined by mold temperature control! This is because mold temperature control has a direct impact on process stability, product quality, and cycle time.

EtaControl®: Energy Efficiency in Manufacturing

EtaControl® from ONI helps plastics processors quickly reduce energy costs.
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Colorful plastic granules in red, blue, black and yellow lie closely together as raw material for plastics processing.

Plastics Industry: Temperature Control Units for Injection Molding

Temperature control in injection molding tools is the primary factor influencing unit costs and part quality. ONI combines intelligent temperature control management with efficient cooling/distribution and machine efficiency (EtaControl®) to stabilize process windows and save energy.

Rhytemper® temperature control management: thermal “fingerprint” per mold circuit, active control of ΔT/flow rate, cycles ~18% shorter on average.
Efficient temperature control/chilled water technology on the market: e.g., PEM-based temperature control units and R290 chilled water solutions deliver verifiable energy and process benefits.
Machine optimization (EtaControl®): demand-based oil flow management significantly reduces electricity costs for conventional injection molding machines.

Overview of the Site

Benefits for You as a Plastics Customer
Project Process
Challenges in the plastics industry
ONI Solution Overview for the Plastics Industry
Applications & Requirements
Contact
Why Choose ONI
References in Plastics
FAQ

Benefits for Plastics Customers

Why are temperature control units crucial in injection molding?

An ONI Rhytemper control cabinet is mounted on an injection molding machine, surrounded by numerous hydraulic hoses and cables.

Higher OEE, less scrap
Transparent data/visualization: Reliable before/after metrics facilitate approval
Faster ROI from cycle time, quality, and energy efficiency improvements
Quality & process stability through intelligent temperature control
Energy efficiency through integrated PEM/R290 concepts
Scalability: from single-mold to plant-wide standard

Why you should choose ONI

Everything under one roof

This is how we bring your temperature control equipment project to life

To ensure optimal operation, we at ONI consider the interaction between the mold, the medium, the peripherals, and the process requirements.

Temperature Control Audit (circuits, ΔT, flow rates, visualization)
Pilot test on a bottleneck tool, including before/after KPIs
Refrigeration/Distribution Match (PEM/R290, Water Distribution)
Rollout & Training (Maintenance/Process)
Commissioning & Process Stabilization
Operation, maintenance & transparency

Additional services

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Challenges

Challenges in the plastics industry

Process Stability & Quality

Fluctuating quality due to uneven tooling/temperature (hot spots/cold spots)
Dimensional deviations, warping, surface defects despite identical settings
Sensitive start-up phases and unstable production conditions in injection molding

Cycle Time, Cooling & Productivity

Long cooling times slow down the cycle (especially for complex parts)
Insufficient or uneven cooling extends cycle time and reduces output
Potential remains untapped because heat is not effectively removed from the mold

Energy & Efficiency in Operation

High energy consumption due to inefficient control or improperly designed temperature control
Heating and cooling “working against each other” → unnecessary heat/cooling generation
Non-optimized media and circulation concepts (water/oil) increase operating costs

Complexity, Transparency, and Root Cause Analysis

Complex systems with many loops and different requirements for each zone
Missing measurement/process data (temperature, flow) → Optimization becomes “trial and error”
Malfunctions caused by contamination / air / leaks are difficult to detect without monitoring in the temperature control system

Solutions

ONI Solution Overview for the Plastics Industry

Cooling

Our ONI solutions:

To cooling systems
To rental
chillers To container cooling systems
To mobile cooling systems

To the overview

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Heating

Our ONI solutions:

To Heat Recovery
To Industrial Heat Pumps
To Combined Heat and Power Plants

Back to overview

Ventilation

Our ONI solutions:

Ventilation Systems
Cleanroom Technology

To the overview

A mechanical room with an ONI refrigeration system, green valve and blue switch box for the industrial cooling circuit.

Typical applications & requirements

Mass production: stable temperatures, short cycle times, quick changeover
Visible parts: uniform heat distribution for reproducible surfaces
Technical parts: consistent conditions for dimensional accuracy and functionality
Molds with multiple cavities: clear controllability, clean circuit structure, transparent status
Energy/efficiency programs: Reduce unnecessary heating and cooling without compromising quality

View references

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Key Topics

Your ONI Contact

We’re happy to answer your questions!

+49 2266 4748-0
info@oni.de

All Locations

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Your benefits

Why Choose ONI

Comprehensive
system solutions

ISO-certified

Assistance
with applications

24/7 service
worldwide

Over 40 years of experience

Patented
efficiency technologies

Financial stability
through CrefoZert

International
recognition

Our customers

These customers already trust us

Proven quality

References & Testimonials on Plastics

Bernhard Gell | Project Manager | HILTI

“For over 20 years, ONI has been responsible for the installation and technical support of refrigeration systems at Hilti Kunststofftechnik GmbH. During this time, our experience working with them has been entirely positive, both in terms of their consulting services and the quality of their work and technical support.”

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Wolf Plastics Verpackungen GmbH

Secure packaging, designed with sustainability in mind.

Ventilation system with connected piping in a mechanical room, a green compressor on the left and an ONI control cabinet on the right.

Schägner GmbH

Success through quality, efficiency, and hygiene standards

Mechanical room with several black tanks, blue pump motors and piping in a refrigeration and cooling water system.

C. Hübner GmbH

C. Hübner has implemented a system for reusing energy once it has been utilized, ensuring a high level of supply reliability, along with a heating…

View all references

Questions & Answers

FAQ on Temperature Control Units for Injection Molding

Common issues include inconsistent part quality, varying cycle times, sensitive start-up phases, or widely fluctuating mold temperatures despite identical settings.

That depends on the temperature range, the tool requirements, and your safety and operational procedures. Water is often efficient and cost-effective, while oil is typically used when there are specific temperature or process requirements.

Absolutely. When temperature and circulation patterns are visible, it’s easier to pinpoint the causes (e.g., contamination, air, leaks, or changes in heat dissipation) more quickly—rather than spending a long time “trying things out.”

In most cases, yes—it’s important to carefully plan the circuits, connection points, and interfaces so that the temperature control system is compatible with the equipment and remains easy to use on a day-to-day basis.