Company: Manufacturing


Since 1996, qualified staff have been working on custom solutions for customers from all over Europe, Asia and the Middle East. Fibre composite structures have primarily been the focus of the work in the form of custom prototypes and series components.
In order to manufacture and process its products, INVENT maintains a comprehensive machine park for all its manufacturing processes. Adapted processes are furthermore developed for new kinds of demanding material combinations and these then optimised to series maturity. With the aid of a variety of equipment, a broad spectrum of products can be produced.

The broad portfolio of services from INVENT, both in terms of technical facilities and specialist skills, guarantee maximum flexibility at a very high quality standard and customer-oriented implementation.

Deployment of Manufacturing Processes at INVENT

  • Infusion/ Injection
  • Prepreg
  • Filament winding
  • Assembly
  • Machining
  • Presses
  • Special processes
  • Painting


The design and configuration of the parts takes place in agreement between the requirements and the possible manufacturing processes. In the field of fibre composites, there are a number of variables to choose between to find the right combination for the job: the choice of fibres, fibre semi-finished products (fabric or NCF), and the resin matrix into which the fibres are embedded.

The heart of the manufacturing is three hot air autoclaves. The wide range of temperatures and pressures which can be achieved by these machines enables a broad spectrum of processes, ranging from infusion through to processing thermoplastic pre-pregs. The computer-controlled pressure and temperature runs during the curing process guarantee reproduceable process control and component quality. Combined with a clean room certified to DIN EN ISO 14644/Class 8 for laminating, the facilities are perfectly suited to manufacturing components for aerospace applications.

Cylinders and struts, besides other fibre composite parts, are manufactured on a CNC-controlled winding machine. The five simultaneous axes of the winding machine allow even highly complex shapes to be created at high precision. Depending on the requirements, core tools can be heated or cooled to keep the materials at an optimum processing temperature.

In the machining field, processing is performed on fibre composite materials and metal alloys with the most demanding specification on tolerances, surfaces and purity using CNC-controlled turning and milling machines. All amendments and rework which cannot be performed on the CNC-controlled machines, are carried out professionally by hand by highly trained personnel.

In our department for surface coating, components from all company divisions can be painted to meet the most diverse requirements. Painting fibre composite components is a demanding specialist field, particularly in combination with specialised coatings for optical systems, thermal insulation or erosion protection. INVENT is accredited with the required permits to coat such components.

Besides the clean room, special integration rooms are available for the assembly of components. Assembly work can therefore take place under optimised environmental conditions such as controlled temperature and purity.

INVENT offers both destructive and non-destructive testing methods – both in accordance with standards and with individual customer requirements. All tests are carried out by trained personnel using calibrated equipment. For quality assurance purposes, we take part in external round robin trials at regular intervals in order to ensure the reliability of the results.

Destructive testing

In destructive testing, INVENT uses a universal testing machine which enables tests within a load range of up to 20 kilonewton (compression and tension). The following tests are carried out as part of our quality assurance procedures:
See all tests


Ultrasonic testing

Non-destructive testing is our standard means of quality assurance for components. Ultrasonic testing can detect unwanted pores, imperfections and delamination in monolithic fibre composite structures. This process can also measure laminate thickness, even with complex component geometries. Our employees are fully trained in accordance with DIN 4179, are highly experienced and hold ultrasonic qualification levels UT2 and UT3. They conduct these highly precise tests in accordance with the specified requirements.
In fibre composite lightweight construction for aviation, quality control reference samples in the form of step wedges are essential to ultrasonic testing. Our step wedges meet the Airbus standard AITM 6-0012. With a step size of 130mm x 130mm, the reference samples are also suitable for adjusting phased array equipment. Each step has a flat-bottom hole as comparison reflectors in different diameters and depths. Intentional defects can also be integrated for test purposes.
On the request of the customer, step wedges can be made from unidirectional fibre semi-finished products, fabric and NCF. Even other materials besides carbon fibre and glass fibre semi-finished products can be used. Besides standardised step wedges, INVENT GmbH also produces component-specific reference samples.

Precise 3D measurement

3D coordinate measurement systems with up to seven axes are available to us. With this highly modern technology, almost any complex component geometry can be measured. It is also possible to precisely orient construction elements during their integration. With a working radius of up to 1.2 metres, we can perform measurements to 28 micrometre (µm) volumetric accuracy. The measurement results can be presented in the form of a measurement log or in relation to a CAD dataset. Our 3D measuring arm is transportable, enabling the measurement of components in an installation situation at a customer’s premises.

Betriebswirt d. H.
Stefan Schaare

+49 531 24466-80