All-plant fiber paper filter rod filter element base paper, preparation method thereof and paper filter rod

Abstract

The invention provides filter element base paper of a full-plant fiber paper filter stick, a preparation method of the filter element base paper and a paper filter stick. The preparation raw materials comprise mixed plant fiber pulp and a sizing auxiliary agent, plant fibers in the mixed plant fiber pulp comprise coniferous wood fibers, bamboo fibers, mulberry bark fibers, paper mulberry bark fibers and jute fibers; the coniferous wood fiber accounts for 40-96% of the mass of the plant fiber; the bamboo fiber accounts for 1-50% of the mass of the plant fiber; the mulberry bark fiber accounts for 1-50% of the mass of the plant fiber; the paper mulberry bark fiber accounts for 1-50% of the plant fiber by mass; the jute fibers account for 1-50% of the plant fibers in mass. The raw paper is prepared from the mixed plant fibers in a specific proportion, so that the on-machine adaptability of paper filter stick forming equipment can be met, and the paper filter sticks which are good in appearance and stable in circumference and pressure drop are prepared.

Description

Technical Field

[0001] The invention belongs to the technical field of paper filter tip rod filter element base paper, and in particular relates to a full-plant fiber paper filter tip rod filter element base paper and a preparation method thereof and a paper filter tip rod. Background Art

[0002] Acetate fiber is made of cellulose, which is made from renewable wood pulp or cotton linter pulp. It is converted into chemical fiber made of cellulose acetate ester by chemical synthesis. Its degradation is mainly achieved through its own aging and microbial action, which generally takes decades or even hundreds of years. The natural degradation process is very slow. Acetate fiber is one of the important auxiliary materials in cigarette production. A large amount of waste is generated every year in the production process of cigarettes and filter rods. Waste acetate fiber bundles and a large number of cigarette butts after people smoke are abandoned in nature, burned or buried, which not only causes a lot of waste, but also harms the environment and is not conducive to environmental protection.

[0003] The European Union defines cellulose diacetate (acetate) as a "disposable plastic product" and stipulates that its member states should reduce the use of acetate in cigarette filters containing acetate by 50% by 2025. The United States, Japan, Southeast Asia and other countries have successively issued "smoking bans" for difficult-to-degrade acetate cigarette butts in the "plastic ban" clauses. The extensive development model at the expense of resource and environmental consumption is no longer suitable for the requirements of high-quality development in the new era. The traditional raw materials of propylene fiber and acetate used in filter rods have poor degradation capabilities. Under the guidance of plastic restrictions and bans, they will gradually transform into easily degradable green materials. Paper filter rods and filter element base paper have become hot topics in industry research. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a full-plant fiber paper filter rod filter element base paper and a preparation method thereof and a paper filter rod. The paper filter rod filter element base paper adopts full-plant fiber, can meet the machine adaptability of paper filter rod forming equipment, and prepare a paper filter rod with good appearance, stable circumference and pressure drop.

[0005] The present invention provides a full-plant fiber paper filter rod filter element base paper, the preparation raw materials include mixed plant fiber slurry and sizing aid;

[0006] The plant fibers in the mixed plant fiber slurry include softwood fibers, bamboo fibers, mulberry fibers, mulberry fibers and hemp fibers;

[0007] The coniferous wood fiber accounts for 40 to 96% of the plant fiber mass;

[0008] The bamboo fiber accounts for 1 to 50% of the mass of the plant fiber;

[0009] The mulberry fiber accounts for 1 to 50% of the plant fiber mass;

[0010] The bast fiber accounts for 1 to 50% of the mass of the plant fiber;

[0011] The hemp fiber accounts for 1 to 50% of the mass of the plant fiber.

[0012] Preferably, the coniferous wood fibers account for 50-90% of the mass of the plant fibers;

[0013] The bamboo fiber accounts for 3-20% of the mass of the plant fiber;

[0014] The mulberry fiber accounts for 2-10% of the mass of the plant fiber;

[0015] The bast fiber accounts for 2-10% of the mass of the plant fiber;

[0016] The hemp fiber accounts for 2-15% of the mass of the plant fiber.

[0017] Preferably, the preparation raw materials include coniferous wood fiber, bamboo fiber, mulberry fiber, ebony fiber and hemp fiber in a mass ratio of (70-90):(3-10):(2-5):(2-5):(3-10).

[0018] Preferably, the basis weight of the base paper is 35.0 to 37.0 g / m 2 , thickness is 84~110μm, air permeability is 3200~3800CU; longitudinal tensile strength is 2.2~2.5KN / m; D65 brightness is ≥87%.

[0019] The present invention provides a method for preparing the base paper of the all-plant fiber paper filter rod filter element described in the above technical solution, comprising the following steps:

[0020] The softwood fiber, bamboo fiber, mulberry fiber, ebony fiber and hemp fiber are dispersed and then decomposed to obtain plant fiber slurry;

[0021] Mixing and purifying the plant fiber slurry to obtain a mixed slurry;

[0022] The mixed pulp and the sizing aid are mixed, sheet-formed, dried, and rolled up to obtain the full-plant fiber paper filter rod and filter element base paper.

[0023] Preferably, the sizing aid is selected from guar gum and / or starch;

[0024] The sizing aid accounts for 3-6% of the mass of the plant fiber.

[0025] The present invention provides a paper filter tip rod, which is made from the full-plant fiber paper filter tip rod filter element base paper described in the above technical solution.

[0026] Preferably, the pressure drop of the paper filter rod is 260-370 mmH2O, and the hardness is 83.6-88.5%.

[0027] The present invention provides a base paper for a filter rod and filter element made of all plant fibers, and the raw materials for preparing the base paper include mixed plant fiber slurry and a sizing agent; the plant fibers in the mixed plant fiber slurry include coniferous wood fiber, bamboo fiber, mulberry fiber, ramie fiber and hemp fiber; the coniferous wood fiber accounts for 40-96% of the mass of the plant fiber; the bamboo fiber accounts for 1-50% of the mass of the plant fiber; the mulberry fiber accounts for 1-50% of the mass of the plant fiber; the ramie fiber accounts for 1-50% of the mass of the plant fiber; the hemp fiber accounts for 1-50% of the mass of the plant fiber. The present invention prepares the base paper by using mixed plant fibers with a specific proportion, which can meet the machine adaptability of the paper filter rod forming equipment and prepare a paper filter rod with good appearance, stable circumference and pressure drop. DETAILED DESCRIPTION

[0028] The present invention provides a full-plant fiber paper filter rod filter element base paper, the preparation raw materials include mixed plant fiber slurry and sizing aid;

[0029] The plant fibers in the mixed plant fiber slurry include softwood fibers, bamboo fibers, mulberry fibers, mulberry fibers and hemp fibers;

[0030] The coniferous wood fiber accounts for 40 to 96% of the plant fiber mass;

[0031] The bamboo fiber accounts for 1 to 50% of the mass of the plant fiber;

[0032] The mulberry fiber accounts for 1 to 50% of the plant fiber mass;

[0033] The bast fiber accounts for 1 to 50% of the mass of the plant fiber;

[0034] The hemp fiber accounts for 1 to 50% of the mass of the plant fiber.

[0035] The all-plant fiber paper filter rod filter element base paper provided by the present invention is prepared from raw materials including mixed plant fiber slurry; the plant fiber in the mixed plant fiber slurry includes coniferous wood fiber; the coniferous wood fiber accounts for 40-96% of the mass of the plant fiber, preferably 50-90%. The tensile index of the coniferous wood fiber slurry is not less than 45N·m / g, the whiteness is not less than 87%, the fluorescent whiteness is not more than 0.5%, and the ash content is in the range of 0.2-0.5%. The length of the coniferous wood fiber is 2-4mm. In a specific embodiment, the coniferous wood fiber is spruce.

[0036] The plant fiber includes bamboo fiber; the bamboo fiber accounts for 1-50% of the plant fiber mass, preferably 3-20%. The tensile index of the bamboo fiber slurry is not less than 30N·m / g, the whiteness is not less than 73%, the fluorescent whiteness is not more than 0.5%, and the dustiness is not more than 800mm 2 / 500g. Bamboo fiber is an excellent plant fiber between coniferous wood and broadleaved wood. It has excellent fast-growing and regeneration properties and is a green and environmentally friendly fiber with better quality than wood pulp. Bamboo pulp is divided into natural unbleached bamboo pulp and bleached bamboo pulp. The natural unbleached bamboo pulp has a richer bamboo scent than the bleached bamboo pulp. Since bamboo pulp fiber is a hollow fiber with a larger specific surface area than wood pulp, it has better water retention performance. Therefore, bamboo pulp paper filter can also be developed as a differentiated and characteristic new highlight, and one or several can be selected to be compounded with wood pulp.

[0037] The plant fiber includes mulberry fiber; the mulberry fiber accounts for 1-50% of the mass of the plant fiber, preferably 2-10%; the tensile index of the mulberry fiber pulp is not less than 40N·m / g; mulberry fiber is an ancient and excellent papermaking raw material, which has both the characteristics of cotton and the advantages of hemp fiber. The fiber morphology of mulberry is very similar to that of mulberry bark, that is, the fiber is mostly cylindrical and has obvious transverse sections on the wall. However, the cellulose content of mulberry fiber is low, only about 40%, the fiber is short, and the strength is insufficient, so it can only be used in combination with long fiber.

[0038] The plant fiber includes mulberry fiber; mulberry fiber is one of the oldest excellent papermaking raw materials, mulberry fiber is relatively long, with an average length of about 5 to 8 mm, obvious transverse sections on the fiber wall, obvious cell cavity, pointed ends of the fiber, and often branched. The mulberry fiber accounts for 1 to 50% of the mass of the plant fiber, preferably 2 to 10%; the tensile index of the mulberry fiber pulp is not less than 45N·m / g.

[0039] The plant fiber includes hemp fiber; the hemp fiber accounts for 1-50% of the mass of the plant fiber, preferably 2-15%. The length of the hemp fiber can reach more than 20 mm. The tensile index of the hemp fiber pulp is not less than 40 N·m / g, the whiteness is not less than 80%, the fluorescent whiteness is not more than 0.5%, and the dustiness is not more than 500 mm. 2 / 500g.

[0040] The coniferous wood fiber in the present invention is longer, which is beneficial to the bonding between fibers and increases the strength and toughness of paper; the hemp fiber is longer and stronger than the coniferous wood fiber, and can be compounded with coniferous wood pulp or bamboo pulp to improve the strength.

[0041] The raw materials for preparation in the present invention include coniferous wood fiber, bamboo fiber, mulberry fiber, walnut fiber and hemp fiber in a mass ratio of (70-90): (3-10): (2-5): (2-5): (3-10). In a specific embodiment, the raw materials for preparation in the present invention include coniferous wood fiber, bamboo fiber, mulberry fiber, walnut fiber and hemp fiber in a mass ratio of 90:3:2:2:3; or coniferous wood fiber, bamboo fiber, mulberry fiber, walnut fiber and hemp fiber in a mass ratio of 70:10:5:5:10; or coniferous wood fiber, bamboo fiber, mulberry fiber, walnut fiber and hemp fiber in a mass ratio of 80:5:5:5:5.

[0042] The preparation raw materials provided by the present invention include a sizing agent; the sizing agent is selected from guar gum and / or starch; the sizing agent accounts for 3-6% of the mass of the plant fiber, specifically 3%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5% or 6%.

[0043] The basis weight of the base paper provided by the present invention is 35.0-37.0 g / m 2 , thickness is 84~110μm, air permeability is 3200~3800CU; longitudinal tensile strength is 2.2~2.5KN / m; D65 brightness is ≥87%.

[0044] The present invention provides a method for preparing the base paper of the all-plant fiber paper filter rod filter element described in the above technical solution, comprising the following steps:

[0045] The softwood fiber, bamboo fiber, mulberry fiber, ebony fiber and hemp fiber are dispersed and then decomposed to obtain plant fiber slurry;

[0046] Mixing and purifying the plant fiber slurry to obtain a mixed slurry;

[0047] The mixed pulp and the sizing aid are mixed, sheet-formed, dried, and rolled up to obtain the full-plant fiber paper filter rod and filter element base paper.

[0048] The present invention disperses coniferous wood fiber, bamboo fiber, mulberry fiber, ramie fiber and hemp fiber and then deflaches them to obtain plant fiber pulp. The obtained plant fiber pulps are coniferous wood pulp, bamboo pulp, mulberry pulp, ramie pulp and hemp pulp respectively; the hemp pulp is specifically flax pulp or bleached hemp pulp. In the present invention, the plant fiber is dispersed by a hydraulic pulper and then enters a deflaker for deflaking. The present invention determines whether to beat the pulp according to production needs; in some embodiments, the beating concentration is 0.5% and the beating degree is 15°SR.

[0049] The plant fiber slurry of the present invention is mixed evenly by a dynamic pulp mixer and then enters a pulping tank; after being purified by a desander and a pressure screen, a mixed slurry is obtained.

[0050] After obtaining the mixed pulp, the present invention mixes the mixed pulp with a sizing agent, forms the mixed pulp into a sheet, dries the mixed pulp, and rolls the mixed pulp into a sheet to obtain a filter element paper made of all plant fibers. The sizing agent in the present invention is selected from guar gum and / or starch; the sizing agent accounts for 3-6% of the mass of the plant fibers.

[0051] The invention forms wet paper sheets through a headbox and a wire part, dries after being passed through a press part, and rolls up to obtain full-plant fiber paper filter rod and filter element base paper.

[0052] The present invention provides a paper filter tip rod, which is made from the full-plant fiber paper filter tip rod filter element base paper described in the above technical solution.

[0053] The pressure drop of the paper filter rod of the present invention is 260-370 mmH2O, and the hardness is 83.6-88.5%.

[0054] The invention adopts GB / T 22838.2-2009, Determination of Physical Properties of Cigarettes and Filter Rods, Part 2: Length Photoelectric Method, to detect the length of the paper filter rod; adopts GB / T 22838.3-2009, Determination of Physical Properties of Cigarettes and Filter Rods, Part 3: Circumference Laser Method, to detect the circumference of the paper filter rod; adopts GB / T 22838.5, Determination of Physical Properties of Cigarettes and Filter Rods, Part 5: Cigarette Pressure Drop and Filter Rod Pressure Drop, to detect the pressure drop of the paper filter rod; adopts GB / T 22838.6-2009, Determination of Physical Properties of Cigarettes and Filter Rods, Part 6: Hardness, to detect the hardness of the paper filter rod; adopts GBT / 22838.13, Determination of Physical Properties of Cigarettes and Filter Rods, Part 13: Filter Rod Roundness, to detect the roundness of the paper filter rod.

[0055] To further illustrate the present invention, a full-plant fiber paper filter rod filter element base paper and its preparation method and paper filter rod provided by the present invention are described in detail below in combination with embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0056] Example 1

[0057] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fibers and a sizing agent according to a paper processing method, wherein the plant fibers include softwood pulp, bamboo pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, the softwood fiber is 90kg, the bamboo fiber is 3kg, the mulberry fiber is 2kg, the mulberry fiber is 2kg, the hemp fiber is 3kg, and the hemp pulp is 3kg. The softwood fiber is made of masson pine, and the hemp pulp is made of bleached hemp pulp. The paper filter rod filter element base paper is prepared by adding the sizing agent according to the ratio of 100kg of absolute dry fiber weight and 6kg of sizing agent. The sizing agent is guar gum.

[0058] The preparation method comprises the following steps:

[0059] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking, and the beating concentration is 0.5%, the beating degree is 15 ° SR, and the plant fiber slurry is obtained;

[0060] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic pulp mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0061] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0062] The basic performance test results of the base paper are shown in Table 1 below.

[0063] Table 1 Basic performance test results of base paper in Example 1

[0064] Serial number Inspection items unit Detection value Detection basis 1 Quantification <![CDATA[g / m 2 ]]> 36.2 GB / T451.2 2 thickness μm 89 GB / T451.3 3 Breathability CU 3689 GB / T23227 4 Tensile strength (longitudinal) KN / m 2.5 GB / T12914 5 D65 Brightness ％ 91 GB / T7974 6 Moisture ％ 5.1 GB / T462

[0065] The present invention uses the plant fiber paper filter rod filter element base paper prepared in Example 1 to make a paper filter rod, and the physical test results of the circumference, roundness, length, pressure drop and hardness are shown in Table 2:

[0066] Table 2 Physical properties test results of paper filter rods prepared in Example 1

[0067]

[0068]

[0069] Example 2

[0070] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fibers and a sizing agent according to a paper processing method, wherein the plant fibers include softwood pulp, bamboo pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, the softwood fiber is 70kg, the bamboo fiber is 10kg, the mulberry fiber is 5kg, the mulberry fiber is 5kg, the hemp fiber is 10kg, and the hemp fiber is 10kg. The softwood fiber is spruce, and the hemp pulp is flax pulp. The paper filter rod filter element base paper is prepared by adding the sizing agent according to the ratio of 100kg absolute dry fiber weight to 4kg. The sizing agent is guar gum.

[0071] The preparation method comprises the following steps:

[0072] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking to obtain a plant fiber slurry;

[0073] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic pulp mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0074] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0075] The basic performance test results of the base paper are shown in Table 3 below.

[0076] Table 3 Basic performance test results of base paper in Example 2

[0077]

[0078]

[0079] The present invention uses the full plant fiber paper filter rod filter element base paper prepared in Example 2 to make a paper filter rod, and the physical test results of the circumference, roundness, length, pressure drop and hardness are shown in Table 4:

[0080] Table 4 Physical properties test results of paper filter rods prepared in Example 2

[0081]

[0082] Example 3

[0083] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fiber and a sizing agent according to a paper processing method, wherein the plant fiber includes coniferous wood pulp, bamboo pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, there are 80kg of coniferous plant fiber, 5kg of bamboo pulp fiber, 5kg of mulberry fiber, 5kg of mulberry fiber and 5kg of hemp pulp fiber. The coniferous plant fiber is larch, and the hemp pulp is bleached hemp pulp. According to the ratio of 100kg of absolute dry fiber weight and 3kg of sizing agent, the paper filter rod filter element base paper is prepared. The sizing agent is guar gum.

[0084] The preparation method comprises the following steps:

[0085] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking to obtain a plant fiber slurry;

[0086] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic pulp mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0087] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0088] The basic performance test results of the base paper are shown in Table 5 below.

[0089] Table 5 Basic performance test results of base paper in Example 3

[0090] Serial number Inspection items unit Detection value Detection basis 1 Quantification <![CDATA[g / m 2 ]]> 36.1 GB / T451.2 2 thickness μm 86 GB / T451.3 3 Breathability CU 3517 GB / T23227 4 Tensile strength (longitudinal) KN / m 2.3 GB / T12914 5 D65 Brightness ％ 89 GB / T7974 6 Moisture ％ 4.9 GB / T462

[0091] The present invention uses the plant fiber paper filter rod filter element base paper prepared in Example 3 to make a paper filter rod, and the physical test results of the circumference, roundness, length, pressure drop and hardness are shown in Table 6:

[0092] Table 6 Physical property test results of paper filter rods prepared in Example 3

[0093]

[0094] Comparative Example 1

[0095] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fiber and a sizing agent according to a paper processing method, wherein the plant fiber pulp includes bamboo pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, there are 40kg of bamboo pulp fiber, 10kg of mulberry fiber, 10kg of hemp fiber and 40kg of hemp pulp fiber. The hemp pulp is bleached hemp pulp. According to the ratio of 100kg of absolute dry fiber weight and 6kg of sizing agent, the paper filter rod filter element base paper is prepared. The sizing agent is guar gum.

[0096] The preparation method comprises the following steps:

[0097] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking, and the beating concentration is 1%, the beating degree is 15 ° SR, and the plant fiber slurry is obtained;

[0098] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0099] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0100] The basic performance test results of the base paper are shown in Table 7 below.

[0101] Table 7 Basic performance test results of base paper in Comparative Example 1

[0102] Serial number Inspection items unit Detection value Detection basis 1 Quantification <![CDATA[g / m 2 ]]> 36.1 GB / T451.2 2 thickness μm 79 GB / T451.3 3 Breathability CU 2809 GB / T23227 4 Tensile strength (longitudinal) KN / m 1.9 GB / T12914 5 D65 Brightness ％ 91 GB / T7974 6 Moisture ％ 5.0 GB / T462

[0103] The present invention intends to make a paper filter rod with the full plant fiber paper filter rod filter element base paper prepared in Comparative Example 1. The physical test results of the circumference, roundness, length, pressure drop and hardness are shown in Table 8:

[0104] Table 8 Physical properties test results of paper filter rods prepared in Comparative Example 1

[0105]

[0106]

[0107] The paper filter rod made of the all-plant fiber paper filter rod filter element base paper prepared in Comparative Example 1 has many holes in its cross section, and the average pressure drop is only 52.81, which does not meet the filter rod appearance and pressure drop requirements.

[0108] Comparative Example 2

[0109] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fiber and a sizing agent according to a paper processing method, wherein the plant fiber slurry includes coniferous wood pulp, bamboo pulp, mulberry pulp and mulberry pulp, wherein, according to the absolute dry weight of the fiber raw materials, there are 80kg of coniferous plant fiber, 10kg of bamboo pulp fiber, 5kg of mulberry fiber and 5kg of mulberry fiber. The coniferous wood fiber is masson pine. According to the ratio of 100kg of absolute dry fiber weight and 4kg of sizing agent, the paper filter rod filter element base paper is prepared. The sizing agent is starch.

[0110] The preparation method comprises the following steps:

[0111] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking, and the beating concentration is 0.6%, the beating degree is 18 ° SR, and the plant fiber slurry is obtained;

[0112] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic pulp mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0113] S-3. Papermaking and forming: Add sizing agent into the prepared mixed pulp, and form wet paper sheets through the headbox and wire section, dry them after the pressing section, and then wind them up to obtain the full-plant fiber paper filter rod and filter element base paper.

[0114] The basic performance test results of the base paper are shown in Table 9 below.

[0115] Table 9 Basic performance test results of base paper in comparative example 2

[0116]

[0117]

[0118] The present invention makes a paper filter rod with the full plant fiber paper filter rod filter element base paper prepared in Comparative Example 2. The physical test results of the paper filter rod, such as the circumference, roundness, length, pressure drop and hardness, are shown in Table 10:

[0119] Table 10 Physical properties test results of paper filter rods prepared in Comparative Example 2

[0120]

[0121] The overall hardness of the paper filter rod made of the all-plant fiber paper filter rod filter element base paper prepared in Comparative Example 2 is relatively low and does not meet the filter rod hardness requirements.

[0122] Comparative Example 3

[0123] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fibers and a sizing agent according to a paper processing method, wherein the plant fibers include hardwood pulp, bamboo pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, there are 90kg of hardwood fiber, 3kg of bamboo pulp fiber, 2kg of mulberry fiber, 2kg of hemp fiber and 3kg of hemp pulp fiber. The coniferous plant fiber is masson pine, and the hemp pulp is bleached hemp pulp. The paper filter rod filter element base paper is prepared by adding the sizing agent according to the ratio of 100kg of absolute dry fiber weight and 6kg of sizing agent. The sizing agent is guar gum.

[0124] The preparation method comprises the following steps:

[0125] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaker for deflaking, and the beating concentration is 0.8%, the beating degree is 23 ° SR, and the plant fiber slurry is obtained;

[0126] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0127] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0128] The basic performance test results of the base paper are shown in Table 11 below.

[0129] Table 11 Basic performance test results of base paper in comparative example 3

[0130] Serial number Inspection items unit Detection value Detection basis 1 Quantification <![CDATA[g / m 2 ]]> 36.3 GB / T451.2 2 thickness μm 88 GB / T451.3 3 Breathability CU 3092 GB / T23227 4 Tensile strength (longitudinal) KN / m 0.8 GB / T12914 5 D65 Brightness ％ 91 GB / T7974 6 Moisture ％ 5.3 GB / T462

[0131] The present invention intends to make a paper filter rod with the full plant fiber paper filter rod filter element base paper prepared in Comparative Example 3. However, due to its low tensile strength, the paper was crushed after trial production on a machine and could not be formed.

[0132] Comparative Example 4

[0133] A full-plant fiber paper filter rod filter element base paper is prepared from raw materials including plant fibers and a sizing agent according to a paper processing method, wherein the plant fibers include softwood pulp, Spanish grass pulp, mulberry pulp, mulberry pulp and hemp pulp, wherein, according to the absolute dry weight of the fiber raw materials, the softwood fiber is 90kg, the Spanish grass pulp is 3kg, the mulberry fiber is 2kg, the mulberry fiber is 2kg, the hemp fiber is 2kg, and the hemp pulp is 3kg. The softwood fiber is made of Masson pine, and the hemp pulp is made of bleached hemp pulp. The paper filter rod filter element base paper is prepared by adding a sizing agent according to a ratio of 100kg of absolute dry fiber weight and 5kg of sizing agent. The sizing agent is guar gum.

[0134] The preparation method comprises the following steps:

[0135] S-1. Preparation of plant fiber slurry: After the plant fiber raw material is dispersed by a hydraulic pulper, it enters a deflaking machine for deflaking, and the beating concentration is 0.6%, the beating degree is 18 ° SR, and the plant fiber slurry is obtained;

[0136] S-2. Preparation of mixed pulp: The obtained plant fiber pulp is mixed evenly by a dynamic mixer and then enters a pulping tank; after purification by a desander and a pressure screen, a mixed pulp is obtained;

[0137] S-3. Papermaking and forming: Add guar gum, a sizing aid, into the prepared mixed pulp, and form wet paper sheets through the headbox and the wire section, and then dry them after the pressing section. After winding, the full-plant fiber paper filter rod and filter element base paper is obtained.

[0138] The basic performance test results of the base paper are shown in Table 12 below.

[0139] Table 12 Basic performance test results of base paper of comparative example 4

[0140] Serial number Inspection items unit Detection value Detection basis 1 Quantification <![CDATA[g / m 2 ]]> 35.8 GB / T451.2 2 thickness μm 97 GB / T451.3 3 Breathability CU 3704 GB / T23227 4 Tensile strength (longitudinal) KN / m 2.1 GB / T12914 5 D65 Brightness ％ 90 GB / T7974 6 Moisture ％ 5.1 GB / T462

[0141] The present invention makes a paper filter rod with the full plant fiber paper filter rod filter element base paper prepared in Comparative Example 4. The physical test results of the paper filter rod, such as the circumference, roundness, length, pressure drop and hardness, are shown in Table 13:

[0142] Table 13 Physical property test results of paper filter rod prepared in Comparative Example 4

[0143]

[0144] The pressure drop of the paper filter rod made of the all-plant fiber paper filter rod filter element base paper prepared in Comparative Example 4 is high and unstable, and does not meet the filter rod pressure drop requirements.

[0145] It can be seen from the above embodiments that the present invention provides a full-plant fiber paper filter rod filter element base paper, and the raw materials for preparation include mixed plant fiber slurry and sizing aid; the plant fibers in the mixed plant fiber slurry include coniferous wood fiber, bamboo fiber, mulberry fiber, ramie fiber and hemp fiber; the coniferous wood fiber accounts for 40-96% of the mass of the plant fiber; the bamboo fiber accounts for 1-50% of the mass of the plant fiber; the mulberry fiber accounts for 1-50% of the mass of the plant fiber; the ramie fiber accounts for 1-50% of the mass of the plant fiber; the hemp fiber accounts for 1-50% of the mass of the plant fiber. The present invention prepares the base paper by using mixed plant fibers with a specific proportion, which can meet the machine adaptability of the paper filter rod forming equipment and prepare a paper filter rod with good appearance, stable circumference and pressure drop. The experimental results show that the pressure drop of the paper filter rod is 260-370 mmH2O, and the hardness is 83.6-88.5%.

[0146] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A full-plant fiber paper filter rod filter element base paper, the preparation raw materials include mixed plant fiber slurry and sizing aid; The plant fibers in the mixed plant fiber slurry include softwood fibers, bamboo fibers, mulberry fibers, mulberry fibers and hemp fibers; The coniferous wood fiber accounts for 40 to 96% of the plant fiber mass; The bamboo fiber accounts for 1 to 50% of the mass of the plant fiber; The mulberry fiber accounts for 1 to 50% of the plant fiber mass; The bast fiber accounts for 1 to 50% of the mass of the plant fiber; The hemp fiber accounts for 1 to 50% of the mass of the plant fiber.

2. The all-plant fiber paper filter rod and filter element base paper according to claim 1, characterized in that: The coniferous wood fibers account for 50 to 90% of the plant fiber mass; The bamboo fiber accounts for 3-20% of the plant fiber mass; The mulberry fiber accounts for 2-10% of the plant fiber mass; The bast fiber accounts for 2-10% of the mass of the plant fiber; The hemp fiber accounts for 2-15% of the mass of the plant fiber.

3. The all-plant fiber paper filter rod and filter element base paper according to claim 1, characterized in that: The preparation raw materials include coniferous wood fiber, bamboo fiber, mulberry fiber, mulberry fiber and hemp fiber in a mass ratio of (70-90): (3-10): (2-5): (2-5): (3-10).

4. The all-plant fiber paper filter rod and filter element base paper according to claim 1, characterized in that: The basis weight of base paper is 35.0~37.0g / m 2 , thickness is 84~110μm, air permeability is 3200~3800CU; longitudinal tensile strength is 2.2~2.5KN / m; D65 brightness is ≥87%.

5. A method for preparing the base paper of the all-plant fiber paper filter rod filter element according to any one of claims 1 to 4, comprising the following steps: The softwood fiber, bamboo fiber, mulberry fiber, ebony fiber and hemp fiber are dispersed and then decomposed to obtain plant fiber slurry; Mixing and purifying the plant fiber slurry to obtain a mixed slurry; The mixed pulp and the sizing aid are mixed, sheet-formed, dried, and rolled up to obtain the full-plant fiber paper filter rod and filter element base paper.

6. The preparation method according to claim 5, characterized in that: The sizing aid is selected from guar gum and / or starch; the sizing aid accounts for 3-6% of the mass of the plant fiber.

7. A paper filter rod made from the all-plant fiber paper filter rod filter element base paper according to claim 1.

8. The paper filter rod according to claim 7, characterized in that: The pressure drop of the paper filter rod is 260-370 mmH2O, and the hardness is 83.6-88.5%.

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