An arrangement for static charge reduction in air jet milling

EP4601794A1Pending Publication Date: 2025-08-20C N INDU +1
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Patent Information

Application Number
EP2023876915
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-10-12
Filing Date
2023-10-10
Publication Date
2025-08-20

AI Technical Summary

Technical Problem

Air jet milling generates significant static charges that can lead to unpredictable discharges, potentially causing fires or explosions, especially in the pharmaceutical industry, where adding water or steam to reduce charges alters particle properties and electrostatic dispersion increases charges further.

Method used

An arrangement featuring a tubular element with a horizontal and vertical component, where an ion emitter inside the vertical tubular element generates alternating charges that are carried by the pneumatic air supply to the milling chamber to neutralize static charges, using a single pin ion emitter connected to an AC voltage for balanced ion emission.

Benefits of technology

Effectively neutralizes static charges during air jet milling, preventing dangerous discharges and maintaining particle properties, resulting in a safe and efficient process that improves the quality of milled powders.

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Abstract

The invention provides an arrangement for reducing static charge in air jet milling The arrangement includes a tubular element having a horizontal tubular element and a vertical tubular element. The vertical tubular element is substantially perpendicular to the horizontal tubular element and joins the horizontal tubular element to form a 'T'. An ion emitter is placed inside the vertical tubular element and generates alternating charges into the horizontal tubular element. The horizontal tubular element is connected to the pneumatic air supply of the air jet mill. The alternating charges generated by the ion emitter are carried by the pneumatic air supply to the milling chamber of the air jet mill for neutralizing the static charges generated during milling.
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