To cut them, they are cooled down from their original core temperature (95-98°C) to 30-35°C, accepting in so doing the subsequently increased risk of microbiological contamination. To preserve the freshness and quality of the product, ttz Bremerhaven is working on the development of an industrial cutting machine within the framework of its “Ultrasonic Cutting” project which makes it possible to cut baked goods containing rye both when hot as well as cold.
Industrial cutting machine with rotating ultrasonic circular knife.
In the “Ultrasonic Cutting“ research project, a high-performance cutting machine for baked goods from rye is being developed
Bremerhaven, October 2011. Wheat and rye cereals are the main raw ingredients used in baking. Immediately after the baking process, products made with these ingredients are germ-free. For the benefit of the cutting process however, they are cooled down to about 30°C. Whilst this indeed prevents the crust from being destroyed when the baked goods are cut, the surface of the baked product is particularly susceptible to contamination from microorganisms in the room or ambient air as a result of the relatively long cooling time of about 2 hours. In its “Ultrasonic Cutting” project, ttz Bremerhaven, together with a plant construction firm (Döinghaus cutting and more GmbH & Co. KG), is developing a technology based on ultrasound which makes it possible to cut bread and rolls both in a semi-frozen state as well as in a hot state of about 60°C, in order to keep microbiological contamination as low as possible.
In the framework of the project, the research provider compared two cutting knives and systems: a conventional serrated knife and the new development, an ultrasonic knife with a diameter of 400 mm which can rotate at up to 50 rpm. In addition, knives whetted on just one side were compared with knives whetted on both sides.
Apart from cutting temperature, amongst the variables examined which influence product quality and appearance of the baked goods were also belt speed and rotation of the ultrasonic and serrated knives, baking mould, crust thickness, different percentages of rye flour content or the influence of various levels of acidification in the sourdough. Microbiological tests on the contamination of the baked goods’ surface after the baking process were also implemented.
The trials showed that it is possible with ultrasonic cutting technology to cut products with a core temperature of about 60°C efficiently and with a good quality result. Apart from lowering the risk of microbiological contamination, this innovative cutting technology offers further advantages: Products which are cut with the ultrasonic knife show a significantly better cross section. Whilst products cut with conventional technology have a coarse surface and a rough pore structure, the pores are not destroyed by the ultrasonic knife. In addition, cutting waste compared to conventional cutting technologies is significantly reduced.
ttz Bremerhaven is a provider of research services and performs application-based research and development. Under the umbrella of ttz Bremerhaven, an international team of experts is working in the areas of food, environment and health.Contact:
Christian Colmer | idw
Making lightweight construction suitable for series production
24.04.2017 | Laser Zentrum Hannover e.V.
It Takes Two: Structuring Metal Surfaces Efficiently with Lasers
15.03.2017 | Fraunhofer-Institut für Lasertechnik ILT
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
24.04.2017 | Physics and Astronomy
24.04.2017 | Materials Sciences
24.04.2017 | Life Sciences