Additive Dispensing Inside a Converging Rod Former
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Solution Overview
Problem
Existing methods for adding substances to sheet material shaped into rods, such as aerosol-generating or flavorful substances, face inefficiencies in distribution and waste due to the fragility of herbaceous materials, leading to uneven additive application and equipment contamination.
Innovation Solution
A method involving dispensing an additive onto sheet material within a funnel-shaped converging device while shaping it into a rod, ensuring high application efficiency and controlled distribution by selecting the dispensing location and using a pipe with varying wall thickness and coatings to minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additive is dispensed onto sheet material after shaping into rod, then application is simple, but distribution is uneven with high concentration in radially outer regions and low concentration in radially inner regions
Solution Approach 1:
The additive is dispensed onto the sheet material before the shaping process completes, while the material is still in the converging device. This preliminary action allows the additive to be distributed throughout the material as it forms the rod shape, ensuring uniform concentration throughout the final rod structure rather than concentrating it on the outer surface.
Solution Approach 2:
The dispensing system is nested within the converging device structure. The pipe with varying wall thickness is positioned inside the converging device, allowing additive delivery integrated with the shaping process without requiring separate external dispensing equipment.
2Loss of substance
If additive is sprayed onto sheet material upstream of converging device, then one side is covered, but additive is wasted due to missing the sheet material
Solution Approach 1:
The pipe structure acts as an intermediary delivery system. Instead of direct spraying that may miss the target, the additive flows through a controlled conduit (the pipe with varying wall thickness) that positions the dispensing opening precisely where needed, ensuring complete transfer of additive to the sheet material without waste.
3Strength
If pipe with constant wall thickness is used, then structure is simple, but sheet material is damaged due to friction and compression
Solution Approach 1:
The pipe wall thickness varies along its length, creating different local properties. The thinner sections are positioned where the sheet material contacts the pipe, reducing friction and compression damage in those critical areas, while thicker sections provide structural support where needed. This local variation in quality optimizes both material protection and structural integrity.
4Loss of substance
If additive is dispensed within converging device, then high percentage of additive is applied to sheet material, but sheet material is fragile and may be damaged
Solution Approach 1:
The pipe wall thickness parameter is changed along its length, creating a gradient structure. This parameter variation allows the pipe to provide adequate structural support while minimizing contact pressure and friction on the fragile sheet material in the critical dispensing zones, enabling efficient additive transfer without material damage.
Data Source
AI summary
A method for producing a rod containing herbaceous material comprises the steps of: providing a sheet material containing herbaceous material; shaping the sheet material into a rod-shape by conveying the sheet material along a conveying direction through a funnel-shaped converging device; and dispensing an additive onto the sheet material within the converging device.