Bayer introduces two new bellows thermoplastic polyurethane materials

Thermoplastic polyurethane (TPU) bellows are typically manufactured using injection blow molding. However, current TPU grade products available on the market face a significant challenge: when production is halted, restarting can be both time-consuming and expensive. The machine must go through a cleaning process, often involving special particles, before it can be restarted smoothly. In some cases, it may take several hours to achieve acceptable part quality. Bayer MaterialScience’s Desmopan® DP1485A and DP1490ATPU grades, based on aromatic polyester, offer a more efficient solution. According to Jürgen Winkler, a TPU processing expert at Bayer, these new materials allow the injection blow molding machine to maintain a longer standby period after the screw has been idle. This means that when production resumes, it can restart without issues or errors. This innovation was developed with the support of OSSBERGER GmbH + Co., a leading manufacturer of bellows injection blow molding machines based in Weissenburg, Bavaria. Klaus Haub, Sales Director at OSSBERGER, shared, “We tested the two new TPU materials on our existing PRESSBLOWER automated injection blow molding machine. The results showed that after using these materials, the restart process became much simpler and production could stabilize quickly.” The two new TPU grades exhibit excellent characteristics for their class. They are highly resistant to abrasion, ensuring long-lasting performance. Their high melt hardness contributes to cost savings during the injection blow molding process. Additionally, their noise-reducing properties are superior, making the bellows significantly quieter during operation compared to similar components made from other elastomeric materials. Winkler added, “We’ve also expanded the processing window based on melting temperature, which allows us to establish a stable production process quickly after the machine restarts.” Bellows are widely used across various industries, particularly in automotive applications such as protecting shock absorbers, suspension systems, and steering axles. When space is limited and thin-walled bellows are required, TPU proves to be an ideal choice. Unlike other elastomers, TPU can produce thin-walled bellows with exceptional mechanical properties, making it a preferred material for demanding applications.

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