06. June 2019

Hennecke: Using polyurea to optimise a ceramic industrial filter

The German company Hennecke GmbH is well-known for providing polyurethane systems and technologies that are geared to meeting customer requirements in all conceivable applications. According to the company, this would not be possible without intensive and continuous research and development at the in-house Techcenter. This example from Nanostone Water GmbH demonstrates how a ceramic industrial filter with a polyurea coating was developed for serial production at the Techcenter in close cooperation with the customer.

Modern PU processing technology for virtually all application areas is available at the Hennecke Techcenter (Source: Hennecke)

Modern PU processing technology for virtually all application areas is available at the Hennecke Techcenter (Source: Hennecke)

Nanostone contacted Hennecke in mid-2016 with an unusual request. The front of a ceramic industrial filter was to be sealed with polyurethane or polyurea. The challenge of this project was to avoid closing up the many nano-coated channels and to only wet the unprotected web structure between them, so that they may longer withstand the abrasive or chemical influences on the medium to be filtered and thus effectively increase the filter service life. Together with Nanostone, Hennecke simulated possible spraying distances, outputs and robot travelling speeds. Assuming that a certain material surface tension could provide a solution to the problem, tests were planned at the Techcenter to verify the theory in practice.

This involved using a Microline – a high-pressure metering machine for the precise metering of the tiniest outputs – together with a robot-controlled MN6 spray mixhead. The first shots looked very promising and the desired physical effects were confirmed. It was even possible to process two different systems and thus determine their advantages and disadvantages. During the testing period, the optimal process parameters were identified and prototypes were produced for further testing and a field trial.

Uncoated ceramic industrial filter (show monolith) (Source: Hennecke)

Uncoated ceramic industrial filter (show monolith) (Source: Hennecke)

The results exceeded expectations and so Nanostone Water GmbH decided to invest in a production plant. In under just six months, Hennecke had manufactured the plant, assembled it at Nanostone and integrated it into the existing synchronised serial production. The process-related knowledge gained from the preliminary testing could be passed on to the plant operators at Nanostone. According to Hennecke, this is an impressive example of the opportunities provided by its Techcenter. In less than two years' development time, an idea and initial enquiry have been transformed into a production plant for optimised serial parts.

From research & development to production

At its headquarters in Sankt Augustin, Germany, Hennecke operates a fully equipped 1,000 m2 technology centre. The facility houses a variety of different machines operated by application engineers, making it possible for interested customers to develop their own new parts or to redefine existing parts. Not only can prototypes be made for pilot production, and initial tests carried out on new products, but also existing products can be improved and reproduced using other production processes. Process technology engineers are actively involved in the development process and if necessary can also provide support services such as simulations or calculations.

The machine portfolio currently includes the following systems:

Automatic polyurea spray application to coat the filter front (Source: Hennecke)

Automatic polyurea spray application to coat the filter front (Source: Hennecke)

  • 2-component Microline 45/45 for small-quantity spray applications with MN mixheads or casting applications with the established MT mixheads
  • 4-component high-pressure Topline HK and Topline HT
  • metering plants, with 4-component MN10-4 mixheads for processing spray systems for PREG, LFT or open spray applications. In addition, sandwich panel feed tables with a panel gripper, glass-fibre cutter, 600 t press, 2.5 m rotary table and Fanuc robot on a traversing axis
  • 3-component Streamline for manufacturing structural elements in the HP-RTM process
  • 6-component high-pressure machine with 40 t mould carrier and Fanuc robot with multi-component mixhead for producing different foams
  • JFlex for continuous production of slabstock foams
  • 3-component Elastoline HP for processing elastomer raw material systems under high-pressure
  • 3-component Elastoline FP for processing elastomer raw material systems under low-pressure
  • 2-component Topline HK 650/650 for processing rigid, flexible and integral skin foam systems under high-pressure
  • 2-component Highline 130/65 for processing rigid, flexible and integral skin foam systems under high-pressure

Hennecke said that due to the growth in new application areas and more extensive processes, existing machines are constantly being designed, tested and further developed for serial production at the Techcenter.

www.hennecke.com

URL: https://www.gupta-verlag.com/news/technology/22927/hennecke-using-polyurea-to-optimise-a-ceramic-industrial-filter