Filter Rod Diameter Control via In-Line Measurement
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Solution Overview
Problem
The production of non-wrapped filter rods for aerosol-forming articles faces challenges in accurately controlling and maintaining a predetermined diameter, leading to inefficiencies and material waste due to the lack of wrapping paper to constrain the filter material.
Innovation Solution
A filter manufacturing apparatus that includes a feed path for continuously feeding filter material, a forming device with a tubular element and heat source to shape the material into a continuous rod, and a diameter measuring device positioned downstream to ensure the rod meets desired diameter specifications before further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wrapping paper is used to constrain filter material, then diameter control is simplified, but the filter structure becomes more complex and material is wasted
Solution Approach 1:
The invention removes the wrapping paper from the filter structure, extracting the constraint function from the final product. Instead of using wrapping paper to constrain the filter material diameter, the system uses a measuring device to detect and control diameter during the forming process, eliminating the need for the wrapping paper constraint mechanism.
Solution Approach 2:
The invention introduces a feedback mechanism by positioning a measuring device in the feed path to continuously monitor the filter material diameter during forming. The measured diameter information is fed back to control the forming process parameters, enabling precise diameter control without requiring wrapping paper for mechanical constraint.
2Loss of substance
If diameter measurement is performed early in the process, then material waste is minimized, but the measuring device must be positioned precisely in the feed path
Solution Approach 1:
The invention performs preliminary measurement of the filter material diameter during the forming process, before the material is fully processed or rejected. By measuring the diameter early in the feed path, the system can identify and remove defective material promptly, minimizing overall material waste while the measuring device is positioned at an optimal point in the continuous feed path.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus enables precise control of the filter rod's diameter, minimizing waste by detecting deviations early in the process and allowing for rapid adjustments to process parameters, thus ensuring consistent production of filters with uniform dimensions.
Implementation Method 1
a heat source adapted to heat the filter material passing in the tubular element
Implementation Method 2
by hardening a bonding material—such as a plasticizer—present within the filter material
Data Source
AI summary
The invention relates to a filter manufacturing apparatus including a feed path adapted to continuously feed a filter material along a longitudinal transport direction, and a forming device connected to a terminating end of the feed path and adapted to form the filter material into a rod-shaped continuous filter body and deliver the formed continuous filter body. The forming device includes: a tubular element adapted to allow the filter material to pass therethrough to form the filter material into the continuous filter body; a heat source adapted to heat the filter material passing in the tubular element. A diameter measuring device is positioned at the outlet of the forming device and adapted to measure a diameter of the continuous filter body.