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System solution for sealing with high process reliability

Kunststofftechnik Krug combines Sonderhoff dosing machine technology from Henkel for seal foaming directly with injection molding production of vacuum cleaner housings

Düsseldorf, Breidenbach / Germany – WEBWIRE
The 6-axis robot places the vacuum cleaner and motor pot housing for the dispensing application in one step on the rotary indexing table part fixtures.
The 6-axis robot places the vacuum cleaner and motor pot housing for the dispensing application in one step on the rotary indexing table part fixtures.

Kunststofftechnik Krug, headquartered in Breidenbach, Germany, has successfully positioned itself in the market as a full-range supplier of complex assemblies for over 50 years. Important industries are the automotive industry as well as living, electrical and electronics. The Krug Group is known for its many years of expertise in plastics technology as well as its high level of development competence and vertical range of manufacture. The company’s customers receive sophisticated and complex plastics technology solutions that are characterized above all by functionality and sustainability.

For Krug, a high level of automation in production and innovative manufacturing technologies are among the decisive factors for success. These were also implemented in the production line for the manufacture of vacuum cleaner housings with polyurethane foam gasket. For this, Henkel Adhesive Technologies supplied a fully automated system solution comprising foam gasket, dosing machine and process automation. The high availability of the dosing system was the decisive factor for Krug in choosing this solution.

The Sonderhoff DM 502 mixing and dosing machine used for 2 material components meets Krug’s high requirements and enables seamless monitoring and compliance with process parameters, for example constant temperature setting by means of a greatly improved temperature control system. Efficient production is also ensured by the constant process stability during fully automatic gasket foaming with the Formed-In-Place-Foam-Gasket (FIPFG) technology.

Fully automatic sealing of vacuum cleaner housings

Krug produces ABS vacuum cleaner housings for the Thomas company on an Engel Duo 650. Injection molding production with a 1-cavity mold sets the cycle time for the subsequent process steps, such as sealing, in a 60-second cycle.

The freshly manufactured vacuum cleaner housing is removed from the mold by a removal gripper and conveyed to the waiting and transfer position on a transfer belt. The housing for the motor pot is fed via a second belt and picked up by the 6-axis robot for parts handling.

In addition, the 6-axis robot picks up the vacuum cleaner housing from the transfer position and moves to the rotary indexing table to deposit the parts on the workpiece fixtures. The rotary table rotates 180° to the dispensing position, where the second 6-axis robot with the mixing head successively traverses the contour of the vacuum cleaner housing as well as the motor pot and precisely applies the Sonderhoff Fermapor K31 polyurethane foam. For the removal of the sealed components, the rotary indexing table rotates again by 180°.

For quality control, the 6-axis robot guides the parts under a camera and places the parts checked in this way on the out-cycle conveyor. The gasket cures on this track. The vacuum cleaner housing is then fully assembled and packed for shipping.

Gasket foaming in the injection molding cycle

In inline processing, the pasty (thixotropic) 2-component sealing foam Fermapor K31 is applied to the contour of the vacuum cleaner housing within the cycle time of 60 seconds directly after removal of the injection molded parts according to the FIPFG principle. The material foams by several times its specific volume in the housing groove and cures under room temperature to form a closed flexible foam gasket. The mixed-cell foam structure allows any component tolerances to be compensated. Due to the fast tack-free time, only short transfer belts are required to clock out the parts. The inline process eliminates the need for pre-produced injection molded parts and expensive intermediate storage. This saves space, costs, and time for efficient production.

Managing Director Rüdiger Braun at Krug is very satisfied with the successful commissioning of the Sonderhoff dosing system from Henkel. ”Thanks to the possibility of inline production and complete assembly of the dusters directly at the machine, we were able to significantly reduce internal logistics processes.” Also decisive for the Sonderhoff system solution were the high expertise of the project management, the short response times, and the willingness to break new ground. In addition, Braun is pleased to say that the high machine availability of the Sonderhoff system is a door opener for new customer orders for sealing components from other industries.

About Kunststofftechnik Krug
The Krug Group, headquartered in Breidenbach in central Hesse and with additional companies in Meerane (Saxony) and Miscolc (Hungary), is a medium-sized family business with 330 employees that has made a name for itself as a reliable partner in the industry far beyond the borders of Germany for over 50 years. Customized solutions in mold making include complex die casting molds (Vacural and structural casting) as well as injection molds (MuCell technology, hybrid technology, stack molds). As an expert in complex components and services in plastics technology, Krug offers economical solutions for the automotive, electrical, and household goods industries through innovative production processes using hybrid, automation and MuCell technologies. The corporate values of a family-owned company – ambition, safety, innovation, and sustainability – are the drivers that enable Krug to continuously align itself with the requirements of the market. Extensive know-how, a high level of innovation, the consistent further development of technology and the continuous training of employees are the basis for quality and constant performance at Krug and ensure long-term prospects for success for customers, suppliers, and employees. More information at

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