Nonwoven grooved filter rod

Abstract

This utility model belongs to the technical field of cigarette auxiliary materials, and relates to a non-woven grooved filter rod, comprising an outer wrapping forming paper, grooved cellulose paper, and non-woven fabric. The layers are distributed concentrically along the radial direction of the filter rod, and are bonded together by a water-based adhesive. The outer wrapping forming paper is either ordinary non-permeable or permeable. The grooved cellulose paper has a fully continuous groove structure, a semi-continuous groove structure, a multi-segment groove structure, or a semi-continuous oblique groove structure. The non-woven grooved filter rod disclosed in this utility model has low cost, good tar adsorption capacity, high suction resistance stability, and hardness that meets industry-standard requirements, effectively alleviating the contradiction between suction resistance stability and hardness in non-woven filter rods.

Description

Technical Field

[0001] This utility model belongs to the technical field of cigarette auxiliary materials, and relates to cigarette filter rods, specifically a non-woven grooved filter rod. Background Technology

[0002] The effective filtration section of a filter rod is typically made of cellulose diacetate or polypropylene fiber tows. These tows, aided by plasticizers or adhesives, form a three-dimensional honeycomb porous structure. As flue gas passes through, harmful substances are trapped by the filter rod, thus filtering the flue gas.

[0003] With the development of society and technology, especially the rise of e-cigarettes, heated tobacco products and low-tar cigarettes, tobacco manufacturers are no longer limited to using traditional filter rods to produce cigarettes. More and more new materials are being used, among which non-woven fabrics are one.

[0004] Nonwoven materials prepared by hydroentangling typically have high air permeability, and the disordered mixing of short fiber diameters forms a complex three-dimensional honeycomb porous structure with varying pore sizes. This makes the movement path of flue gas within the filter rod more complex, and makes it easier for harmful substances in the flue gas to be trapped by the filter rod, thereby improving the adsorption and trapping capacity of the filter rod and reducing the harmfulness of the flue gas.

[0005] Despite the many advantages of nonwoven filter rods, the inherent poor uniformity of nonwoven fabrics produced by the hydroentangling process leads to a significant increase in the fluctuation of the draw resistance of the resulting filter rods. The draw resistance difference (the difference between the maximum and minimum draw resistance values) far exceeds the national standard requirements for filter rod products. Furthermore, there is a natural trade-off between the hardness and draw resistance of nonwoven filter rods. Increasing the hardness of the filter rod inevitably requires increasing the filler weight, resulting in excessively high draw resistance, greatly reducing the ease of smoking and leading to a poor smoking experience. Conversely, when the draw resistance of the filter rod is appropriate, its hardness is too low, making it difficult to meet the hardness requirements of high-speed cigarette rolling processes.

[0006] The grooved structure of cigarette filters is a special design used to reduce the amount of harmful substances in cigarette smoke inhaled, while simultaneously regulating draw resistance and smoke temperature. These grooves, typically located on the outer layer (inside the forming paper) or within the inner fiber layer of the filter, are usually spiral, annular, or axial, forming air channels. They are often made of the same material as the main filter body (cellulose acetate or polypropylene) and are formed through special embossing or laser engraving. The core principle of the grooved structure is bypass ventilation, primarily serving to dilute the air, cool it, and maintain draw resistance.

[0007] The nonwoven grooved filter rod disclosed in this utility model improves the adsorption resistance stability of the nonwoven filter rod through filter rod structure innovation, and also increases the hardness of the filter rod, so that the nonwoven filter rod can not only have good adsorption capacity, but also adapt to high-speed industrial production. Summary of the Invention

[0008] In view of the shortcomings of existing nonwoven filter rods, the purpose of this utility model is to disclose a nonwoven grooved filter rod.

[0009] Technical solution

[0010] A nonwoven grooved filter rod includes an outer wrapping forming paper, grooved cellulose paper, and nonwoven fabric. The layers of material are distributed in concentric circles along the radial direction of the filter rod, and the layers are bonded together by a water-based adhesive. The outer wrapping forming paper is a common non-breathable forming paper or a breathable forming paper. The grooved cellulose paper has a fully continuous groove structure, a semi-continuous groove structure, a multi-segment groove structure, or a semi-continuous oblique groove structure.

[0011] In a preferred embodiment of this invention, the longitudinal tensile energy absorption value of the outer wrapping paper is greater than 10 N·m / g, and the basis weight per unit area is greater than 20 g / m². 2 .

[0012] In a preferred embodiment of this utility model, the grooved cellulose paper forms a grooved structure after being shaped by rolling mills, and the basis weight per unit area is greater than 40 g / m². 2 .

[0013] In a preferred embodiment of this utility model, the nonwoven fabric is one or more of polylactic acid (PLA), cellulose acetate (CA), polybutylene succinate (PBS), and polyhydroxyalkanoate (PHA), preferably polylactic acid (PLA); the basis weight per unit area is greater than 30 g / m². 2 .

[0014] The preferred embodiment of this utility model may also include other functional materials, including but not limited to liquid fragrances, solid fragrances, granules, and gels.

[0015] Beneficial effects

[0016] This utility model discloses a non-woven grooved filter rod through structural innovation. It has low cost, good tar adsorption capacity, high suction resistance stability, and hardness that meets the general industry standard requirements, effectively alleviating the contradiction between suction resistance stability and hardness of non-woven filter rods. Attached Figure Description

[0017] Figure 1 Schematic diagram of the cross-sectional structure of a non-woven grooved filter rod;

[0018] Figure 2 Schematic diagram of the full-through trench structure;

[0019] Figure 3 Schematic diagram of a semi-through trench structure;

[0020] Figure 4Schematic diagram of a multi-segment trench structure;

[0021] Figure 5 Schematic diagram of a semi-through inclined groove structure;

[0022] Among them, 1-outer wrapping paper, 2-groove cellulose paper, 3-nonwoven fabric, 4-groove portion of grooved cellulose paper, and 5-ungroove portion of grooved cellulose paper. Detailed Implementation

[0023] The present invention will be described in detail below with reference to the embodiments, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0024] Example 1

[0025] Fully grooved nonwoven filter rod

[0026] according to Figure 1 The structure uses a unit area weight of 35 g / m². 2 Polylactic acid nonwoven fabric 3, with an embossing depth of 0.40 mm and a setting temperature of 120℃, and... Figure 2 The filter rod is made of grooved cellulose paper 2 with a fully grooved structure and an outer forming paper 1. The length of the filter rod after assembly is 30mm.

[0027] Example 2

[0028] Semi-through grooved non-woven filter rod

[0029] The difference from Example 1 is that the grooved cellulose paper uses... Figure 3 The semi-through groove structure shown has a groove section length of 15mm. All other conditions are the same as in Example 1.

[0030] Example 3

[0031] Multi-segment grooved nonwoven filter rod

[0032] The difference from Example 1 is that the grooved cellulose paper uses... Figure 4 The multi-segment groove structure shown has a groove segment length of 15mm. All other conditions are the same as in Example 1.

[0033] Example 4

[0034] Semi-through oblique groove non-woven filter rod

[0035] The difference from Example 1 is that the grooved cellulose paper uses... Figure 5 The semi-through oblique groove structure shown has a groove section length of 15mm. All other conditions are the same as in Example 1.

[0036] A cigarette was fitted with a 30mm long standard cellulose acetate filter rod with a similar draw resistance value (target draw resistance value) to the filter rod of the embodiment of the present invention as Comparative Example 1;

[0037] Using the same outer wrapping forming paper as in the example and 35g / m² 2 Polylactic acid nonwoven fabric (without embossing, shaping, or groove structure) was used to make ordinary cylindrical nonwoven filter rods. After assembly, the filter rods were 30 mm long, serving as comparative example 2.

[0038] The draw resistance difference and hardness of the filter rods were compared, and the tar in the flue gas was analyzed. The results are shown in Table 1 below.

[0039] Table 1. Summary of test results for Examples 1-4 and Comparative Examples 1-2

[0040]

[0041] Note: Tar reduction (%), based on Comparative Example 1.

[0042] The results showed that, compared with ordinary nonwoven filter rods (Comparative Example 2), the various embodiments of this utility model (Examples 1-4) significantly reduced the suction resistance fluctuation (the range of Examples 1-4 was 1245 Pa to 1852 Pa, which was 52.8%-68.0% lower than the 3890 Pa of Comparative Example 2), significantly improved the hardness (from 71.66% to 84.25%-84.88%), and maintained excellent tar reduction effect (25.67%-38.26% vs 19.56%). Although the suction resistance fluctuation (range) of the embodiments of the present invention is still higher than that of the standard cellulose acetate filter rod (Comparative Example 1), it has been significantly improved compared with the ordinary nonwoven filter rod (Comparative Example 2) (the suction resistance range is reduced by 52.8%-68.0%). This shows that the present invention has a significant positive effect on improving the quality of nonwoven filter rods, effectively solves the problems of large suction resistance fluctuation and low hardness of ordinary nonwoven filter rods, and significantly improves the overall performance of nonwoven filter rods, making them meet the requirements of industrial applications.

[0043] The above-described embodiments are merely implementations of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the description of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A nonwoven groove filter rod comprising an outer wrapping of plug wrap (1), a groove of cellulosic paper (2) and a nonwoven (3), characterised in that: The layers of materials are distributed in the form of concentric circles along the radial direction of the filter rod, and the layers are bonded by the water-based adhesive; wherein the outer wrapping forming paper (1) is a common air impermeable forming paper or an air permeable forming paper; the grooved cellulose paper (2) has a full-through groove structure, a half-through groove structure, a multi-section groove structure or a half-through inclined groove structure.

2. A nonwoven sleeve for a grooved filter rod according to claim 1, characterized in that: The outer wrapper forming paper (1) has a longitudinal tensile energy absorption value of greater than 10 N.m / g and a unit area grammage of greater than 20 g / m 2 .

3. The nonwoven-tubed filter rod of claim 1, wherein: The grooved cellulose paper (2) is shaped by roller pressing to form a groove structure, and the weight per unit area is greater than 40 g / m 2 .

4. The nonwoven-tubed filter rod of claim 1, wherein: The nonwoven fabric (3) has a grammage of greater than 30 g / m 2 .

5. The nonwoven-tubed filter rod of claim 1, wherein: The non-woven fabric (3) is polylactic acid (PLA).

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