Non-woven fabric for filter stick

Abstract

The invention belongs to the technical field of cigarette filter sticks, and particularly relates to a non-woven fabric for a filter stick, which is prepared by blending one or more of lyocell fibers, polylactic acid fibers, viscose fibers, bamboo pulp fibers, cotton pulp fibers, mahjong fibers and wood pulp fibers, and must comprise the lyocell fibers. The non-woven fabric is composed of multiple laying layers, and in the multiple laying layers, the using amount ratios of lyocell fibers and other fibers in each laying layer are not completely the same. According to the technical scheme, the raw materials of the non-woven fabric all adopt fibers which can be degraded by themselves, and in the multiple laying layers, the number of the lyocell fibers in each laying layer is gradually increased from the middle to the two surfaces, so that it is guaranteed that the cigarette filter stick does not have peculiar smell, and the smoking sense is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of filter rods for cigarettes, and particularly relates to a nonwoven fabric for the filter rod. Background Art

[0002] As an important component of the "three papers and one stick" in cigarettes, filter rods have a significant impact on the smoking quality, tar reduction and harm reduction of cigarettes. At present, the commonly used filter rods on the market generally use acetate fiber tow as the main filter material. It has good elasticity and thermal stability, and can effectively intercept harmful components such as tar and nicotine in the smoke. It is an excellent filter material for cigarettes. However, the wood pulp raw material for the production of acetate fiber tow mainly relies on imports, and the production cost is relatively high, and there is a huge room for substitution. In addition, the biodegradation time of acetate fiber tow is long, resulting in the main treatment methods of discarded filter rods being incineration and landfill, which causes great environmental pollution.

[0003] In order to achieve the functions of reducing tar and reducing harm and being degradable, paper filter rods have been studied at home and abroad. They are made of sheets made of natural plant fibers and rolled by wrinkling. They have strong biodegradability and low raw material cost, which is more in line with the industry's development concept of "saving, clean and green". Chinese invention patent CN201810556769.X discloses a multi-component non-woven fabric made of acetate fiber, soybean protein fiber, aloe fiber, corn protein fiber, wormwood fiber, etc. through water spunlace. It has the characteristics of easy degradation, environmental protection and pollution-free. However, in fact, the degradation of this non-woven fabric is only the separation between the components. The soybean protein fiber, aloe fiber, corn protein fiber, wormwood fiber, etc. can indeed be degraded, but acetate fiber cannot actually be degraded. CN 112831911 A discloses a non-woven fabric and a preparation method thereof, the purpose of which is to improve the strength of acetate fiber non-woven fabric. The preparation method adopts mixed opening, web forming, web laying, reinforcement, and drying steps, and the prepared non-woven fabric achieves a biodegradability rate of 100%. However, the nonwoven fabrics prepared by the above technologies cannot be used for filter rods, and acetate fiber cannot be 100% degraded. At the same time, paper filter rods have more significant filtering performance for harmful substances such as tar in flue gas, making them more advantageous in the field of tar reduction and harm reduction. However, due to its high interception rate for various components in flue gas, it also brings problems such as lighter smoke, less aroma and heavier paper smell. Summary of the invention

[0004] The object of the present invention is to provide a nonwoven fabric for filter rods, which is used for manufacturing filter rods and can solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] A nonwoven fabric for a filter rod, prepared by blending one or more of lyocell fiber, polylactic acid fiber, viscose fiber, bamboo pulp fiber, cotton pulp fiber, mahjong fiber, and wood pulp fiber, and must include lyocell fiber;

[0007] The nonwoven fabric is composed of multiple layers, and in the multiple layers, the usage ratio of the lyocell fiber to other fibers in each layer is not all the same.

[0008] Furthermore, the density of the nonwoven fabric is 20-100 g / m 2 , breaking strength is 5-100N, thickness is 100um-1000um.

[0009] Furthermore, in the multi-layered layers of the nonwoven fabric, the proportion of the Lyocell fiber used gradually increases from the middle layer to the two surface layers.

[0010] Further, the nonwoven fabric includes a hydrophobically modified solvent.

[0011] Furthermore, the hydrophobically modified solvent includes one or more of silicon dioxide, zinc oxide polystyrene, calcium carbonate, polytetrafluoroethylene, polydimethylsiloxane, polyvinylidene fluoride, polypropylene, polyethylene, and polyacrylonitrile.

[0012] Furthermore, the hydrophobically modified solvent is disposed on two surfaces of the nonwoven fabric.

[0013] Furthermore, the hydrophobically modified solvent includes a flame retardant, and the amount of the flame retardant is 5%-20% of the hydrophobically modified solvent.

[0014] Furthermore, the flame retardant is a metal hydroxide, an antimony-based flame retardant or a halogen-based flame retardant.

[0015] Furthermore, at least one surface of the nonwoven fabric is treated with fragrance.

[0016] The beneficial effects of the present invention are:

[0017] The raw materials of the nonwoven fabric of the present technical solution are all self-degradable fibers, and by gradually increasing the lyocell fibers in each layer from the middle to the two surfaces in the multi-layer ply, it is ensured that the cigarette filter rod has no odor that affects the smoking sensation.

[0018] The nonwoven fabric of the present technical solution improves the excessive adsorption of tar and nicotine in smoke by using a hydrophobically modified solvent, and prevents smoke generated by the combustion of the filter rod due to heating during the smoking process from being inhaled by using a flame retardant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of the nonwoven fabric for filter rod of the present invention.

[0020] Description of reference numerals:

[0021] 1. Nonwoven fabric; 2. Lamination. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0023] The preparation method of the nonwoven fabric of the present application can refer to the prior art CN 112831911 A, and also adopts the conventional mixing, opening, web forming, web laying, reinforcement and drying steps of conventional nonwoven fabrics. Of course, those skilled in the art can choose any other preparation method according to actual needs to realize the technical solution of the present application. The applicant does not illustrate and describe the preparation method of the nonwoven fabric of the present invention.

[0024] The nonwoven fabric for filter rod of the present application is prepared by blending one or more of lyocell fiber, polylactic acid fiber, viscose fiber, bamboo pulp fiber, cotton pulp fiber, mahjong fiber and wood pulp fiber. However, it should be noted that no matter how many of the above fibers the nonwoven fabric for filter rod of the present application is composed of, lyocell fiber must be used as one of the components. The nonwoven fabric of the present application can also be prepared by only lyocell fiber.

[0025] The nonwoven fabric 1 of the present application is composed of multiple layers 2, and the specific number of layers is determined according to actual needs. The thickness of the prepared nonwoven fabric can be between 100 um and 1000 um, and the number of layers is also between 5 and 30 layers. Moreover, in the nonwoven fabric that is not prepared only from lyocell fibers, the usage ratio of lyocell fibers to other fibers in each layer is not all the same. Such a structural design is verified through repeated experiments. While being able to ensure degradation, it is also necessary to consider whether the use as a filter rod interferes with the taste of cigarette smoke. Because, in the actual tobacco field, so far, the raw materials that can be used for cigarette filter rods and are actually used are only acetate fibers, and other materials are all on paper and cannot be actually used at all. The primary problem that the present technical solution needs to overcome is the replacement of acetate fibers. If the nonwoven fabric is prepared according to the current conventional method, that is, the layers of each component of the present application are all in the same proportion, the effect of acetate fibers being used for filter rods cannot be achieved, and it cannot be used for cigarette filter rods.

[0026] The density of the nonwoven fabric of this application is 20-100g / m 2 The breaking strength is 5-100N, which can fully meet the performance requirements of existing cigarette filter rods.

[0027] The nonwoven fabric of the present application includes a hydrophobic modified solvent for improving the excessive adsorption of tar and nicotine in smoke. The hydrophobic modified solvent in the present application is arranged on both surfaces of the nonwoven fabric and is added during the preparation process of the nonwoven fabric. The hydrophobic modified solvent includes one or more of silicon dioxide, zinc oxide polystyrene, calcium carbonate, polytetrafluoroethylene (PTFE), polydimethylsiloxane (PDMS), polyvinylidene fluoride (PVDF), polypropylene (PP), polyethylene (PE), polyacrylonitrile (PAN), etc.

[0028] In the present application, in order to prevent the prepared filter rod from burning and producing odorous smoke during the heating process, a flame retardant is included in the hydrophobic modified solvent, and the amount of the flame retardant is 5%-20% of the hydrophobic modified solvent. The flame retardant is a metal hydroxide, an antimony-based flame retardant or a halogen-based flame retardant.

[0029] In the present application, at least one surface of the nonwoven fabric is subjected to a fragrance-carrying treatment, which is achieved through processes such as fragrance spraying and fragrance injection, and is used to provide functions such as enriching the filter rod fragrance, enhancing fragrance and retaining moisture.

[0030] Example 1

[0031] The present application provides a nonwoven fabric for a filter rod, which is prepared by blending lyocell fiber, wood pulp fiber and bamboo pulp fiber, wherein the mass ratio of lyocell fiber to wood pulp fiber and bamboo pulp fiber is 7:2.5:0.5. The nonwoven fabric consists of 8 layers, wherein the proportion of lyocell fiber in the middle two layers to the nonwoven fabric is the same, that is, the mass percentage of lyocell fiber in the layer is 60%, and the amount of lyocell fiber increases from the middle two layers to the outside, respectively, to 67%, 74% and 81% of the mass percentage of lyocell fiber in the layer, respectively. In this embodiment and the following embodiments, the weight of each layer is the same.

[0032] The nonwoven fabric in this embodiment has a thickness of 200 um and a density of 38 g / m 2 The breaking strength is 14 N, which can fully meet the performance requirements of existing cigarette filter rods.

[0033] Example 2

[0034] The present application provides a nonwoven fabric for a filter rod, which is prepared by blending lyocell fiber, wood pulp fiber and bamboo pulp fiber, wherein the mass ratio of lyocell fiber to wood pulp fiber and bamboo pulp fiber is 7:2.5:0.5. The nonwoven fabric consists of 8 layers, wherein the proportion of lyocell fiber in the middle two layers to the nonwoven fabric is the same, that is, the mass percentage of lyocell fiber in the layer is 60%, and the amount of lyocell fiber increases from the middle two layers to the outside, respectively, to 67%, 74% and 81% of the mass percentage of lyocell fiber in the layer, respectively. In this embodiment and the following embodiments, the weight of each layer is the same.

[0035] The nonwoven fabric in this embodiment has a thickness of 200 um and a density of 38 g / m 2 The breaking strength is 14 N, which can fully meet the performance requirements of existing cigarette filter rods.

[0036] In the nonwoven fabric of this embodiment, silicon dioxide is used as the hydrophobic modified solvent, and aluminum hydroxide containing 5% silicon dioxide is added. In this embodiment, there is no requirement for the amount of silicon dioxide, and those skilled in the art can make corresponding adaptive changes according to different tobacco formulas, etc.

[0037] Example 3

[0038] The present application provides a nonwoven fabric for a filter rod, which is prepared by blending lyocell fibers and wood pulp fibers, wherein the mass ratio of lyocell fibers to wood pulp fibers is 8.5:1.5, and the nonwoven fabric consists of 13 layers, wherein the lyocell fibers in the middle layer account for 60% of the nonwoven fabric, and the amount of lyocell fibers increases isogradiently from the two middle layers to the outside, and the mass percentage of the lyocell fibers in the outermost layer is 90%.

[0039] The thickness of the nonwoven fabric in this embodiment is 340 um and the density is 64 g / m 2 The breaking strength is 31 N, which can fully meet the performance requirements of existing cigarette filter rods.

[0040] In the nonwoven fabric of this embodiment, polyethylene is used as the hydrophobic modified solvent, and 10% aluminum hydroxide of polyethylene is added. In this embodiment, there is no requirement for the amount of polyethylene, and those skilled in the art can make corresponding adaptive changes according to different tobacco formulas, etc.

[0041] Example 4

[0042] The present application provides a nonwoven fabric for a filter rod, which is made of lyocell fiber and is composed of 20 layers. The thickness of the nonwoven fabric in this embodiment is 450 um and the density is 87 g / m 2 The breaking strength is 58N, which can fully meet the performance requirements of existing cigarette filter rods.

[0043] In the nonwoven fabric of this embodiment, polyethylene is used as the hydrophobic modified solvent, and 10% aluminum hydroxide of polyethylene is added. In this embodiment, there is no requirement for the amount of polyethylene, and those skilled in the art can make corresponding adaptive changes according to different tobacco formulas, etc.

[0044] Example 5

[0045] The present application provides a nonwoven fabric for a filter rod, which is prepared by blending lyocell fiber, wood pulp fiber and cotton pulp fiber, wherein the mass ratio of lyocell fiber to wood pulp fiber and bamboo pulp fiber is 9:0.5:0.5, and the nonwoven fabric consists of 15 layers, wherein the lyocell fiber in the middle layer accounts for 65% of the mass percentage of the nonwoven fabric, and the amount of lyocell fiber increases isogradiently from the middle layer to the outside, and the lyocell fiber in the outermost layer accounts for 92% of the mass percentage of the layer. In this embodiment and the following embodiments, the weight of each layer is the same.

[0046] The thickness of the nonwoven fabric in this embodiment is 360 um and the density is 69 g / m 2 The breaking strength is 42 N, which can fully meet the performance requirements of existing cigarette filter rods.

[0047] In the nonwoven fabric of this embodiment, silicon dioxide is used as the hydrophobic modified solvent, and aluminum hydroxide containing 8% silicon dioxide is added. In this embodiment, there is no requirement for the amount of silicon dioxide, and those skilled in the art can make corresponding adaptive changes according to different tobacco formulas, etc.

[0048] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope disclosed in the present application, multiple variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A nonwoven fabric for a filter rod, characterized in that: It is prepared by blending one or more of lyocell fiber, polylactic acid fiber, viscose fiber, bamboo pulp fiber, cotton pulp fiber, mahjong fiber, and wood pulp fiber, and must include lyocell fiber; The nonwoven fabric is composed of multiple layers, and in the multiple layers, the usage ratio of the lyocell fiber to other fibers in each layer is not all the same.

2. The nonwoven fabric for filter rod according to claim 1, characterized in that: The nonwoven fabric has a density of 20-100 g / m2, a breaking strength of 5-100 N, and a thickness of 100 um-1000 um.

3. The nonwoven fabric for filter rod according to claim 1, characterized in that: In the multi-layer layup of nonwoven fabrics, the proportion of lyocell fiber used gradually increases from the middle layer to the two surface layers.

4. The nonwoven fabric for filter rod according to claim 1, characterized in that: The nonwoven fabric includes a hydrophobically modified solvent.

5. The nonwoven fabric for filter rod according to claim 4, characterized in that: The hydrophobically modified solvent includes one or more of silicon dioxide, zinc oxide polystyrene, calcium carbonate, polytetrafluoroethylene, polydimethylsiloxane, polyvinylidene fluoride, polypropylene, polyethylene, and polyacrylonitrile.

6. The nonwoven fabric for filter rod according to claim 4, characterized in that: The hydrophobic modified solvent is arranged on two surfaces of the nonwoven fabric.

7. The nonwoven fabric for filter rod according to claim 4, characterized in that: The hydrophobically modified solvent includes a flame retardant, and the amount of the flame retardant is 5%-20% of the hydrophobically modified solvent.

8. The nonwoven fabric for filter rod according to claim 7, characterized in that: The flame retardant is a metal hydroxide, an antimony-based flame retardant or a halogen-based flame retardant.

9. The nonwoven fabric for filter rod according to claim 1, characterized in that: At least one surface of the nonwoven fabric is treated with fragrance.

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