Coaxial irregular variable-diameter hollow filter stick

Abstract

A concentric different-diameter hollow filter stick relates to the technical field of cigarettes, a cavity (2) penetrating through two ends of a filter stick body (1) is axially arranged at the axis of the filter stick body (1), the cavity (2) is composed of large-diameter section cavities (3) and small-diameter section cavities (4) which are alternately arranged, the large-diameter section cavities (3) and the small-diameter section cavities (4) are in smooth transition connection, and after the large-diameter section cavities (3) and the small-diameter section cavities (4) are cut into filter tips, the large-diameter section cavities (3) and the small-diameter section cavities (4) are communicated with each other. And each section of filter tip comprises a section of large-diameter section cavity (3) and a section of small-diameter section cavity (4). The variable-diameter cavity filter stick optimizes the smoke flowing path, the large-aperture end is a five-star complex channel, and the small-aperture end is round.

Description

Technical Field

[0001] This utility model relates to the field of cigarette technology, specifically to a coaxial irregularly shaped variable diameter hollow filter rod. Background Technology

[0002] Currently, commercially available cavity composite filter rods are generally fixed-diameter cavities or have simple geometric shapes such as spheres. In practical applications, they suffer from mediocre filtration performance. Patent application CN220800017U discloses "a cigarette filter rod and cigarette product." The variable-diameter filter rod described in this patent is solid, resulting in low deposition during filtration. The filtration effect at the variable-diameter section is not significant, and the dimensions of this variable-diameter filter rod fluctuate considerably at different locations on its outer periphery, causing stratification and leakage in subsequent filter rod manufacturing and finished cigarette production. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a coaxial irregular diameter hollow filter rod with good filtration effect.

[0004] The technical solution of this utility model is: a coaxial irregular-shaped hollow filter rod, including a filter rod body, wherein the filter rod body has a cavity extending through both ends along the axis at the axis, the cavity is composed of alternating large-diameter cavity and small-diameter cavity, the large-diameter cavity and the small-diameter cavity are smoothly connected, and after being cut into filter nozzles, each filter nozzle contains a large-diameter cavity and a small-diameter cavity.

[0005] The technical advantages of this invention are as follows: The variable-diameter hollow filter rod optimizes the path of flue gas flow. The coarse-diameter end features complex channels such as a five-pointed star, while the fine-diameter end is circular. The entire variable-diameter path gradually narrows from a complex shape to a circle. When flue gas enters this path through the circular hole at the fine end, the flow velocity is high at the fine-diameter end and slow at the coarse-diameter end, creating a Venturi effect, resulting in the most significant flue gas deposition. Simultaneously, the complex wall surface of the variable-diameter path greatly increases the probability of flue gas collisions within the cavity, making the flue gas movement more complex and thus enhancing the filter rod's ability to trap and adsorb flue gas. The hollow exterior is wrapped with loosely packed filaments, which are then further wrapped with forming paper. This eliminates the impact of uneven material distribution and fluctuations in circumferential dimensions caused by irregular hollow structures during filter rod manufacturing. Furthermore, it increases the likelihood of harmful substances in the flue gas being trapped and adsorbed by the filaments, thereby enhancing the overall ability of the filter rod to trap and adsorb flue gas. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of this utility model;

[0007] Figure 2 This is a schematic diagram of the cavity structure of this utility model. Detailed Implementation

[0008] like Figure 1 and 2 As shown, a coaxial, irregularly shaped, variable-diameter hollow filter rod includes a filter rod body 1. The filter rod body 1 has cavities 2 extending through both ends along its axis at the center. The cavities 2 are composed of alternating large-diameter cavities 3 and small-diameter cavities 4, with a smooth transition between them. After being cut into filter tips, each filter tip contains a large-diameter cavity 3 and a small-diameter cavity 4. Flue gas enters the large-diameter section from the small-diameter section, creating a Venturi effect, which enhances the flue gas deposition effect.

[0009] The cavity wall of the large-diameter section 3 is provided with axially arranged grooves 5. The grooves can increase the probability of flue gas colliding with the inner wall of the cavity.

[0010] The cross-section of the large-diameter cavity 3 is a polygonal star shape.

[0011] The cross-section of the large-diameter cavity 3 is a four-pointed star, five-pointed star, or six-pointed star. More grooves will increase the scrap rate.

[0012] The cross-section of the small-diameter cavity 4 is circular.

[0013] The filter rod body 1 is made of cellulose diacetate filament bundles.

[0014] The filter rod body 1 is surrounded by a shaped paper layer 6.

[0015] An open filament bundle layer 7 is wrapped between the filter rod body 1 and the forming paper layer 6.

[0016] Existing cavity filter rod molding technologies are all solid-state molding technologies, meaning the core position of the molding die is fixed during production, making it impossible to continuously produce cavity filter rods with varying pore sizes. To solve this problem, this product employs dynamic molding technology. Building upon traditional molding processes, a motor is connected to the core of the molding die, causing the core to reciprocate along the direction of the filament bundle's travel, thereby changing the inner diameter of the cavity filter rod.

Claims

1. A coaxial, irregularly shaped, variable-diameter hollow filter rod, comprising a filter rod body, characterized in that, The filter rod body (1) has a cavity (2) extending through both ends of it along the axis at the center. The cavity (2) is composed of alternating large-diameter cavity (3) and small-diameter cavity (4). The large-diameter cavity (3) and small-diameter cavity (4) are smoothly connected. After being cut into filter nozzles, each filter nozzle contains a large-diameter cavity (3) and a small-diameter cavity (4).

2. The coaxial irregular-shaped variable-diameter hollow filter rod as described in claim 1, characterized in that, The cavity wall of the large-diameter section cavity (3) is provided with axially arranged grooves (5).

3. The coaxial irregular-shaped variable-diameter hollow filter rod as described in claim 2, characterized in that, The cross-section of the large-diameter cavity (3) is a polygonal star shape.

4. The coaxial irregular-shaped variable-diameter hollow filter rod as described in claim 3, characterized in that, The cross-section of the large-diameter cavity (3) is a four-pointed star, a five-pointed star, or a six-pointed star.

5. The coaxial irregular-shaped variable-diameter hollow filter rod as described in claim 1, characterized in that, The cross-section of the small-diameter cavity (4) is circular.

6. The coaxial irregularly shaped variable diameter hollow filter rod as described in claim 1, characterized in that, The filter rod body (1) is made of cellulose diacetate filament bundles.

7. The coaxial irregularly shaped variable diameter hollow filter rod as described in any one of claims 1 to 6, characterized in that, The filter rod body (1) is surrounded by a shaped paper layer (6).

8. The coaxial irregular-shaped variable-diameter hollow filter rod as described in claim 7, characterized in that, The filter rod body (1) is wrapped with an open filament bundle layer (7) between it and the forming paper layer (6).

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