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DORNIER will present the latest technology for improved production of battery separator film at "Film Expo"


Megatrends like the energy revolution, electromobility and digitalization are inextricably associated with the question of energy storage. Film produced on the production lines built by Lindauer DORNIER GmbH can be found in more and more rechargeable batteries of electric cars, smartphones and wearables. At the Film Expo (December 5 - 7) in Tokyo, the technology leader will present the very latest clip technology for more efficient production of tomorrow's battery films.

"Asian manufacturers, mainly in Japan and South Korea, lead the world in the production of highly specialized films of unrivaled quality", says Patrick C. Fischer, area sales manager film stretching line at DORNIER. The company on the shores of Lake Constance has shipped system components for film production to Japan for decades: components such as transverse stretching and heat setting machines, casting units and longitudinal stretching machines.

The demand in the Land of the Rising Sun for film stretching technology with the extra cachet "Made in Germany" is expected to continue to grow in the future, because battery separator film is made with DORNIER equipment there as well. The film separates the cathode and the anode from each other not only in power stores for photovoltaic systems but also in rechargeable batteries for electric cars and smartphones. Given the intimate association of these special films with current technological megatrends, production volumes thereof may be expected to rise significantly in the foreseeable future.


Low shrinkage, better film properties

DORNIER now intends to introduce a new clip which is designed to further improve the quality of this separator film. "This clip technology allows to achieve a much better relaxation of the produced film”, says Patrick C. Fischer. This is a refinement of a clip which was developed jointly with a Japanese film manufacturer in the mid-1980s for selectively controlling shrinkage. In a production line, clips grip and transport the film during the manufacturing process.

According to Patrick C. Fischer, the new development will make it possible to adjust the film shrinkage – specifically the MD shrinkage – even more effectively than before. This ensures that the film retains very good dimensional stability even at high temperatures both in the machine direction and the transverse direction. Because of the clip, the film is uniformly isotropic in all directions, and this also helps to improve the product properties considerably, area sales manager Patrick C. Fischer says.


Customers value DORNIER service quality and local representation

In Japan, Shonan Trading has managed all sales, deliveries and service business for DORNIER's film stretching lines and systems since 2015. But Mr. Patrick C. Fischer adds that beyond the quality and durability of the machinery, Japanese customers who also use DORNIER equipment to make polyester film for visual effect and polypropylene film for packaging appreciated the confidentiality with which their proprietary expertise was treated. The fact that the family-owned business maintained a local presence and service including spare parts deliveries and conversions represented added value for new and existing customers alike.