Indirect heating
For metal-plastic joints

Illustration Indirect heating of a workpiece

For some compounds it is not possible or not worthwhile heating the materials directly. Here, the target material can be heated indirectly.

Indirect heating is carried out by a metallic workpiece that is inductively heated and transmits or radiates the heat to the target material.

This process is particularly suitable for joining metal and plastic (e.g. metallic bodies surrounded by plastic). Here, indirect heating of the metal creates a strong bond with the plastic that is free of contamination.

Where is indirect heating used?

Syringe manufacture

In the production of syringes, clean metal-plastic joints are essential. Therefore, the syringe needles are melted into the plastic receptacle. The cannula is inductively heated up to the temperature at which the plastic of the already placed receptacle begins to melt. This creates a liquid-tight and sterile connection between the materials.
Since induction heating has very short heating times and is easily reproducible, very fast cycle times and efficient production processes are possible in medical technology.

Your process

This is how we implement inductive joining techniques for you

Optimised, sustainable and efficient processes for joining, shrinking and separating require experience and expertise. As a solution provider, we bring this to the table.

These process steps are taken together
Zwei Mitarbeiter vor Anlage
Zwei Mitarbeiter an Whiteboard

Our service

Other services we offer

Various services relating to the development process, financing and maintenance of induction systems are standard with us.

More about our service offers

Products for induction heating

Induction converters
Inductors
Measuring & monitoring technology
Other induction heating technology

Or get involved
a little deeper:

Fundamentals of induction
Layout of induction systems
The Himmelwerk Laboratory
Research collaboration

Get in touch with your personal contact - our engineers are looking forward to hearing from you

Daniel Schulte

Head of International Sales

Applications overview
Special solutions

Since 1950, Himmelwerk has shipped more than 19,000 high and medium frequency converters worldwide.
By how much can you reduce your CO₂ emissions per year? Let’s have a look.

Assumption 1: 25% of your converters are still operational.

Assumption 2: They have an average output of 6 kW and thus a power consumption of 7 kW.

Assumption 3: These generators are operational 8 hrs per day and 5 days per week.

Assumption 4: Inductive heating uses up to 40% less energy than conventional methods. Let’s assume 30%.

With these assumptions, our calculation would look like this: Daily energy consumption: 8 hrs x 7 kW = 56 kW

Energy savings per day: 56 kWh / 0.7 = 80 kWh; 80 – 56 = 24 kWh

Total energy savings per day: 24 kWh x 4,750 converters = 114,000 kWh

Total energy savings per year: 220 working days x 114,000 kWh = 25,080,000 kWh

Conversion factor kWh/CO₂: 1 kWh is equivalent to approx. 0.485 kg of CO₂ (source: German Federal Environmental Agency, Climate Change 15/2022)

CO₂ reduction per year: 25,080,000 kWh x 0.485 kg = 12,163,800 kg