Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

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Rudolf Emmerich

Peter Elsner

Armin Dommer

Peter Eyerer

Helfried Urban

Michael Jauss

Helmut Schmid

Norbert Eisenreich

Lars Ziegler

Adam Geissler

Maik Ziegler

Mathias Kaiser

Horst Muegge

Christian Ress

Horst Mugge

Andreas Koleczko

Gesa Langer

Konstantin Räuchle

Eberhard Räuchle

Klaus Martin Baumgärtner

Urban Helfried

Ruediger Braeuning

Matthias Graf

Peter Prof Eyerer

Michael Dipl-Ing Walch

Axel Dipl -Ing Kauffmann

A method for heating a fiber/plastic composite material (FPC) comprising at least one layer (L) of carbon fibers (F) in a plastic matrix (P) includes inducing a magnetic field (MF) by means of a microwave antenna (MA) in the fiber/plastic composite material (FPC), and the field direction of the magnetic field (MF) runs in a plane of the layer (L) of carbon fibers (F).

Method for heating a fiber/plastic composite material

The aim of the invention is to provide an alternative to the intensive treatment of a product, especially plasma treatment, in specific areas only. Towards this end, the invention provides a device for producing microwaves for treating workpieces, comprising at least one microwave antenna with an extended conductor for producing alternating electromagnetic fields, a housing that substantially extends over the length of the conductor, and an extended microwave decoupling area which follows the conductor and which is located in the housing. The housing is formed by at least one resonant cavity, which has a long shape and follows the course of the microwave antenna. The resonant cavity has at least one tapering, closed, first crown area and the decoupling area essentially extends in the focussing area of the resonant cavity. An at least non-divergent housing area adjoins the resonant cavity.

Linearly extended device for large-surface microwave treatment and for large surface plasma production

A propellant device of consisting of a compact charge and a firing system for pipe weapons or ballistic drives is proposed. At least one electromagnetic radiation absorbing medium, e.g. carbon black, is dispersed in the compact charge and can be activated by means of a firing system emitting electromagnetic radiation. The compact charge is thereby disintergrated in fragments through triggering of the firing system and the fragments are accelerated into the gas volume produced during burning of the compact charge. The inventive propellant device avoids the use of chemical firing as well as mechanical firing means. Moreover, fragmentation of the compact charge permits maintenance of the produced maximum pressure over a longer period of time to impart a higher muzzle velocity to an object to be accelerated, e.g. a projectile, a rocket or the like.

Propellant device for pipe weapons or ballistic projection

Device for heating components &prime; of a microwave-absorbing plastic material, said device incorporating a microwave generator which generates microwaves of a particular frequency, an antenna with at least one free end &prime; to which the microwaves are conducted, and an enclosure surrounding and shielding the antenna with a heating zone &prime; provided between the free end &prime; of the antenna and the shielding enclosure for the localized heating of the components &prime;, said device featuring in the area of the heating zone &prime; at least one temperature sensor &prime; which is interactively unaffected by the microwaves and which is capable of determining the temperature of the component &prime; during the heating process. This device in combination with the associated process for heating components &prime; permits the monitoring of the temperature in the heating zone &prime;, thus ensuring a consistent quality level of the heated components.

Device and method of heating components made of microwave absorbing plastic

With a device for heating parts,made of a microwave absorbing plastic and having a microwave generator,that generates microwaves of a certain wavelength, an antenna,to which the microwaves are conducted, having at least one free end,and a device,which surrounds the antenna,, it is proposed that the device for shielding,be designed with a tubular shape, so that the device,has an inside diameter smaller than half the wavelength, projects beyond the free end,of the antenna and has an opening,in its end face. With this device it is possible to achieve a spatially limited and nevertheless homogeneous heating of parts,. Furthermore a method of heating or welding, shaping or crosslinking parts made of a microwave absorbing plastic using this device is also proposed.

Process for manufacturing composite bodies made of plastics

Process for enlarging the surface of particles

Growing community of inventors

Durmersheim, Germany

Rudolf Emmerich