Transverse Microwave Resonator for Filter Capsule Liquid Detection
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Solution Overview
Problem
Current methods in the tobacco processing industry fail to effectively check the liquid content of capsules in filter cigarettes after they have been completely processed, leading to potential damage and quality issues during storage and manufacturing, as existing microwave sensors can only detect defects when capsules have dried out, missing the opportunity to prevent damaged capsules from affecting the final product.
Innovation Solution
An arrangement featuring a trough conveyor device with a microwave resonator having a lateral opening, allowing rod-shaped articles to be checked transversely to their longitudinal axis, using multiple microwave measuring devices with different frequencies and orientations to ensure accurate positioning and filling detection, and employing low-loss materials to minimize interference, enabling precise measurement of capsule condition and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional microwave sensors are used to check capsules during filter rod production, then defects can be detected, but the detection is delayed until capsules have dried out during storage
Solution Approach 1:
The patent performs microwave measurements on capsules immediately after filter rod production, before storage and drying occur. This preliminary detection action allows defects to be identified while capsules still contain sufficient liquid content, eliminating the time delay inherent in traditional methods that only detect defects after drying during storage
2Measurement precision
If microwave sensors measure capsules in the production line, then quality control is possible, but the measurement direction is limited to the face of the article
Solution Approach 1:
The patent transitions from traditional face-on measurement (one-dimensional approach) to lateral/radial measurement (introducing a new dimensional approach). The microwave resonator is positioned to measure capsules from the side as they pass through the resonant field, enabling measurement of capsule filling content and position with improved precision while allowing the system to adapt to different capsule orientations and positions within the filter rod
3Measurement precision
If multiple microwave measuring devices are used to increase measurement redundancy, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent employs multiple microwave resonators that are integrated into a single measurement system, where each resonator contributes to comprehensive capsule characterization. The system uses multiple resonators at different positions to simultaneously determine capsule filling content, position, and orientation, achieving high measurement precision while maintaining system efficiency through multi-functional operation of the resonators
Solution Approach 2:
The measurement system is divided into multiple independent microwave resonator units, each capable of independent operation. This segmentation allows the system to achieve high measurement precision through multiple measurements while maintaining flexibility in system configuration and reducing overall complexity compared to a single complex resonator system
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
This solution allows for reliable and precise detection of capsule liquid content and condition in filter cigarettes after manufacturing, preventing damage and ensuring quality by using transverse microwave measurements and multiple resonators for redundancy, thus improving the quality control of finished products before packaging.
Implementation Method 1
at least one microwave resonator which is further developed in that one or more troughed conveyor devices is or are designed as a troughed drum or as a troughed cone drum and the at least one microwave resonator has at least one lateral opening
Implementation Method 2
rod-shaped articles are acted upon by the microwave measuring field substantially transverse to their longitudinal axis with the microwave measuring field
Data Source
Figure 1
Figure 2a~3b
Figure 4~7
AI summary
The invention relates to an arrangement (10, 110, 210) for inspecting rod-shaped articles (25) of the tobacco processing industry, in particular for determining the liquid content of capsules (22) in filters (20) of filter cigarettes (25), comprising at least one trough conveyor device (12, 14, 17) with troughs (16) for receiving and transversely axially conveying rod-shaped articles (25) and at least one microwave measuring device with at least one microwave resonator (30, 30', 32, 130, 230). The invention further relates to a machine of the tobacco processing industry and a corresponding method.In the arrangement according to the invention (10, 110, 210), the at least one microwave resonator (30, 30', 32, 130, 230) has at least one lateral opening (38, 62, 135, 236) and is arranged relative to the at least one trough conveyor device (12, 14, 17) such that rod-shaped articles (25) on their conveying path on the at least one trough conveyor device (12, 14, 17) are located at a point of greatest approximation to or greatest entry into the at least one lateral opening (38, 62, 135, 236) within the effective range of a microwave measuring field (39, 39', 144, 238) generated in the microwave resonator (30, 30', 32, 130, 230), wherein the rod-shaped articles (25) when passing through the microwave measurement field (39, 39', 144, 238) they are subjected to the microwave measurement field (39, 39', 144, 238) essentially perpendicular to their longitudinal axis.