Hosokawa Alpine presents its own calibration basket for blown film lines

Augsburg, 15 December 2025 - The mechanical engineering company Hosokawa Alpine presents a new development for its blown film lines: a new, modular calibration basket for stabilising and calibrating the film bubble above the frost zone.

The calibration basket plays a central role in the production process: directly after exiting the die, it stabilises the blown film bubble and precisely defines its circumference. In this way, it reliably guides the film bubble and makes a decisive contribution to the quality of the film. The premium calibration basket from Hosokawa Alpine has roller arms with ball-bearing rollers in a V arrangement and centre-guided roller positioning. It works with a solid, high-precision scissor principle for optimum film quality. It also has retaining elements for attaching the ultrasonic sensors for bubble control. "Our calibration basket is perfectly matched to the other components of Alpine blown film lines and fully integrated into our overall system. For example, the diameter adjustment and height adjustment can be controlled via our ExVis system control unit," says Bernd Bayer, Director R&D Blown Film Extrusion at Hosokawa Alpine. Customers thus receive everything from a single source. This also facilitates service and maintenance, as suitable spare parts are always readily available.

The calibration basket from Hosokawa Alpine has a modular design and can be optionally equipped with additional features. An additional monomer separator is available for monomer extraction, which collects the extracted monomers separately. This prevents contamination of the bubble. Another option is a post-cooling unit to increase the output. It reduces blocking of the collapsed film bubble and is particularly suitable for faster cooling of the film bubble with limited roof heights. The basket can also be fitted with an infrared sensor to monitor the film temperature. 

The calibration basket from Hosokawa Alpine is available in four different sizes, covering the entire spectrum of layflat widths.

Hosokawa Alpine is a worldwide leader and innovative machine and plant manufacturer with its headquarters in Augsburg and a branch office in Leingarten. The company also maintains several subsidiaries in Germany and abroad. The core competencies of Hosokawa Alpine are, on the one hand in mechanical process engineering operations for the manufacture of machines and systems used in processing powders, granulates and bulk materials, and on the other hand in film extrusion operations for the manufacture and finishing of blown film. The company employs approximately 840 people and generated an annual sales volume of roughly 255 million euros in the 2023/2024 fiscal year. The company's export ratio is around 80 percent. Since 1987, the company has been a wholly owned subsidiary of the Japanese Hosokawa Micron Corporation.