Hollow Filter Rod with Triangular Inner Core
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Solution Overview
Problem
Existing hollow filter sticks for cigarettes are complex in shape and difficult to produce on a large scale due to their multi-layered structure, which limits their industrial production and flavoring capabilities.
Innovation Solution
A forming method for an externally-hollow filter stick with a filled core, utilizing a cylindrical outer layer and a regular triangle inner layer formed by folding paper, where the inner layer is filled with tows, allowing for a one-time forming system with a trumpet-like mouth design that simplifies the production process and enables better smoke gas circulation and flavoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered hollow filter stick structure is used, then filtering efficiency is improved, but manufacturing complexity increases and large-scale production becomes difficult
Solution Approach 1:
The filter stick is divided into distinct functional layers: an outer hollow cylindrical layer for smoke circulation and an inner triangular layer filled with flavoring tows. This segmentation allows each layer to be optimized independently while simplifying the overall manufacturing process through modular assembly.
Solution Approach 2:
The inner triangular forming paper layer is nested within the outer cylindrical forming paper layer, with the inner layer containing flavoring tows. This nested structure enables compact integration of multiple functions (filtration, flavoring, smoke guidance) while maintaining a simple external form suitable for standard production equipment.
2Adaptability or versatility
If a complex pressure-reduced channel or groove is formed by folding forming paper, then hollow filter stick function is achieved, but ease of manufacture decreases
Solution Approach 1:
Instead of creating complex folded grooves in the forming paper to achieve the hollow structure, the invention inverts the approach by directly forming a simple cylindrical hollow structure and filling it with tows. This simplifies the forming paper design to basic cylindrical and triangular shapes that are much easier to manufacture at scale.
Solution Approach 2:
The invention changes the geometric parameters of the forming paper from complex folded patterns to simple cylindrical and triangular geometries. The hollow structure is achieved through the cylindrical shape itself rather than through complex folding patterns, making the manufacturing process significantly simpler and more suitable for large-scale production.
3Reliability
If flavoring is added to improve cigarette sensory quality, then aroma quality is enhanced, but manufacturing process complexity increases
Solution Approach 1:
The flavoring tows are merged with the inner forming paper layer during the same manufacturing process. The inner triangular forming paper is filled with flavoring tows before the final assembly, combining the structural forming and flavoring insertion steps into a single integrated process that does not increase overall manufacturing complexity.
Solution Approach 2:
The inner triangular forming paper layer serves dual functions: it provides structural support for the hollow filter stick and simultaneously acts as a container for the flavoring tows. This self-service design eliminates the need for separate flavoring insertion mechanisms, maintaining manufacturing simplicity while achieving enhanced aroma quality.
Data Source
Figure 1~3
Figure 4
AI summary
The present invention discloses an externally-hollow filter stick with a filled core. The filter stick is cylindrical in appearance and is composed of an outer layer which is a cylinder (W1) formed by rolling outer forming paper (W) and an inner layer which is in a cylindrical shape with a cross section being a regular triangle (N1) in an axial direction of the cylinder (W1) formed by folding inner forming paper (N); and three vertexes of the regular triangle (N1) are on an inner wall surface of the cylinder (W1), wherein an interior of the inner forming paper (N) is filled with inner tows (S2). The present invention further discloses a forming method of a triangular filter stick with a filled core.