“Power for the future” with a 2-component version of the MicroPower production cell

WITTMANN BATTENFELD is presenting the production of a “lab on a chip” as an impressive example from the field of medical technology to demonstrate a 2-component application of clean-room micro injection molding. The product is manufactured in a production cell consisting of 2 MicroPower 15 machines.

The equipment for this application consists of 2 MicroPower 15/10 machines connected with each other by a clean-room tunnel. The injection-molded parts are transported and joined together by the integrated W8VS2 Scara robots.

Here, both the special micro-structured surface of the molded part and the coordination of the interacting machines and their robot systems by the control system are regarded as special challenges. The molds are supplied by Microsystems UK (Fig. 1).

Fig. 1: Schematic image of 2C MicroPower and lab-on-a-chip drawing
Photo by WITTMANN Group

In this production process, various components of the “check-card lab” are injection-molded, checked and assembled in the upstream MicroPower. The parts are subsequently deposited on a transfer module and transported to the downstream MicroPower, where the assemblies are picked up and inserted into the mold by a combined insertion/removal handling system.

Here, the parts are overmolded with TPE (thermoplastic elastomer), then removed and transferred to a depositing system. The objective of this demonstration is to give trade visitors an idea of the MicroPower’s capabilities and its flexible application options. Firstly, it shows the extremely high degree of precision with which micro parts and micro surface structures can be reproduced and manufactured in a stable injection molding process. Secondly, it highlights the outstanding flexibility of the MicroPower and its peripheral appliances. Thanks to these attributes, this specialized machine is able to accomplish even highly complex tasks.

Fig. 2: Parts are formed and assembled in the injection molding machine on display (1 and 2) and
subsequently overmolded in the downstream injection molding machine (3); finally, the finished part is removed and deposited (4).
Photo by Wittmann-Group

Lab on a chip
The term “lab on a chip” normally designates a micro fluidic system which scales down certain selected functions of conventional labs (such as the separation of individual ingredients from a mixture) to the dimensions of a microchip, using only minute volumes of fluid (Fig. 3).

Fig. 3: Comparison of a conventional lab with a lab-on-a-chip system
Photo by Wittmann-Group

With this technology, fluids such as blood can be completely and automatically analyzed on a single chip. Transport of the samples between the various reaction and analysis chambers is effected by capillary forces. From the engineering point of view, lab-on-a-chip systems can be regarded as a sub-category of micro-electromechanical systems, which combine miniaturized sensor systems with micro fluidics. This involves special challenges in terms of structuring and finishing component surfaces and modifying their electrical attributes. The MicroPower is the machine model of the PowerSeries from WITTMANN BATTENFELD specially designed for injection-molding small and micro parts. The specially remarkable feature of the MicroPower is the innovative two-step screw-and-plunger injection unit with a shot volume range from 0.05 to 4 cm3. Via this injection unit, thermally homogeneous melt is injected with the result of premium-quality parts from absolutely stable production with short cycle times. Thanks to the all-electric MicroPower’s excellent clean-room compatibility, this machine is particularly predestined for medical technology applications.

For further information, please visit: www.wittmann-group.com

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