阅读说明：本技术 一种无硫环保型引线纱纸及其制作工艺 (Sulfur-free environment-friendly lead yarn paper and manufacturing process thereof ) 是由 罗汉荣 夏钰敏 吴永安 江洪申 于 2020-11-17 设计创作，主要内容包括：本发明涉及引线纱纸制备技术领域,具体为一种无硫环保型引线纱纸及其制作工艺；由引线纱纸及均匀涂敷在其表面的石蜡溶液组成,且无硫环保型引线纱纸表面与水的接触角为152°～163°；本发明所制作的引线纱纸疏水性能得到大幅度地提升,有效地减小了其发生回潮的几率,延长了其使用寿命；而且其还具有优良的抗张强度及抗拉强度,有效地提升了其品质。再者,本发明通过对纸浆进行单端次氯酸盐漂白,有效地提高了引线纱纸的白度及触感；所制作的引线纱纸不含硫元素,其在燃烧后不会产生硫的氧化物而对大气造成污染,比较环保。(The invention relates to the technical field of preparation of lead yarn paper, in particular to sulfur-free environment-friendly lead yarn paper and a manufacturing process thereof; the environment-friendly type lead-in yarn paper consists of lead-in yarn paper and paraffin solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly type lead-in yarn paper and water is 152-163 degrees; the hydrophobic property of the lead yarn paper manufactured by the invention is greatly improved, the probability of moisture regain is effectively reduced, and the service life is prolonged; and it also has excellent tensile strength and tensile strength, effectively improving its quality. Moreover, the single-end hypochlorite bleaching is carried out on the paper pulp, so that the whiteness and the touch of the lead yarn paper are effectively improved; the manufactured lead yarn paper does not contain sulfur element, does not generate sulfur oxide after combustion to pollute the atmosphere, and is relatively environment-friendly.)

1. The sulfur-free environment-friendly lead yarn paper is characterized in that: the environment-friendly type lead-in yarn paper consists of lead-in yarn paper and paraffin solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly type lead-in yarn paper and water is 152-163 degrees.

2. The sulfur-free environment-friendly threading paper according to claim 1, wherein the preparation method of the paraffin solution comprises the following steps: dissolving a proper amount of paraffin in absolute ethyl alcohol to form a mixed component with the concentration of 8-18 g/L; then adding hot water at the temperature of 50-65 ℃ into the paraffin wax solution, and quickly stirring for 3-8 min to obtain the paraffin wax solution; wherein the adding amount of the hot water is 3.5-4.5% of the volume of the mixed components.

3. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 1, characterized by comprising the following steps:

s1, weighing a proper amount of fresh mulberry bark, cleaning the surface of the fresh mulberry bark, cutting the fresh mulberry bark into long strips with the length of 1.5-2.5 cm by using a slicing machine, soaking the long strips in soft water for 4-7 hours, filtering the soaked strips, and drying the filtered strips in a constant-temperature drying oven;

s2, placing the dried mulberry bark into a steaming ball, adding a proper amount of alkali liquor into a cooking pot according to the solid-to-liquid ratio of 1: 3-4, slowly raising the temperature of the alkali liquor at a certain speed to 140-150 ℃, and soaking for 2-3 hours at the temperature in a heat preservation way; then, cold rotation is carried out for 15-25 min, steam is introduced to increase the pressure to 0.18-0.25 MPa, the mixture is soaked for 10-20 min under the pressure, steam is slowly released for 35-50 s, then the pressure is increased to 0.7-1.0 MPa through the steam, the mixture is subjected to heat preservation and cooking for 4-6 h under the pressure, and spraying is carried out after the heat preservation and cooking are finished;

s3, bleaching the pulp obtained in the step S2 by single-ended hypochlorite; wherein the concentration of paper pulp is 3.8-4.2% during bleaching treatment, the content of available chlorine is 2.4-3.2%, the bleaching temperature is set to 36-42 ℃, the bleaching time is set to 3-4 h, the pH value at the end point of bleaching is more than or equal to 8.5, and the obtained bleaching pulp is marked as bleaching pulp;

s4, delivering the bleached pulp obtained after bleaching into a pulping machine for pulping for 60-90 min to enable the beating degree of the pulp to reach 18-30 SR, then placing the pulp with the concentration of 0.75-0.85% into a refiner for homogenizing, and simultaneously adding a proper amount of dispersant to homogenize until the viscosity is 75-80S/20 ℃, and obtaining the mixed pulp;

s5, making paper from the mixed slurry obtained in the step S4 on a lateral-flow cylinder paper machine, drying the wet paper in a flood cylinder, coating the paper with paraffin solution during drying, and performing trial production on the prepared lead yarn paper to finally obtain the sulfur-free environment-friendly lead yarn paper finished product.

4. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: in the step S1, the mulberry bark is dried until the water content is 70-80%, and the drying temperature is set to be 60-70 ℃.

5. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: the alkali liquor used in the step S2 is 20-25% of sodium hydroxide solution.

6. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: the temperature rise rate in the step S2 is 2-5 ℃/min.

7. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: and in the step S4, when pulping is carried out, the pulping current is 80-100A.

8. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: the dispersant used in the step S4 is a polyacrylamide dispersant, and the dosage of the dispersant is 3.5-4.2% of the weight of the slurry.

9. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: the working pressure of the drying cylinder in the step S5 is 1.5-3.0 kg/cm²。

10. The process for manufacturing the sulfur-free environment-friendly lead-wire gauze paper according to claim 3, wherein the process comprises the following steps: the total coating weight of the paraffin solution in the step S5 is 10-12% of the weight of the finished paper.

Technical Field

The invention relates to the technical field of preparation of lead yarn paper, in particular to sulfur-free environment-friendly lead yarn paper and a manufacturing process thereof.

Background

The lead yarn paper is a basic material for producing fireworks and firecrackers, and the soft dry tension of the lead yarn paper is required to be more than 16 newtons, the wet tension is required to be more than 3.5 newtons, and the dry breaking length is more than or equal to 6500 m. Traditionally, only bast plant fibers with fiber length such as mulberry bark, paper mulberry bark and the like and corresponding processes are adopted to produce the lead yarn paper meeting the use requirements. The low-cost and easily available wood pulp and other short fiber materials cannot produce the lead yarn paper which meets the requirements of fireworks and firecrackers. Therefore, most of the silk-threading paper manufacturers concentrate on the raw materials of mulberry bark and paper mulberry bark, and the production scale is limited by the yield of the raw materials. In particular, mulberry bark and paper mulberry bark are also the top grade raw materials for producing typewriting wax paper, so the raw materials are in short supply and demand, and the supply-demand ratio is 1:3. Due to the large gap of raw materials, the price rises straight, the mulberry bark reaches 900 yuan/ton in 90 years and 1400 yuan/ton in 91 years, and the goods source is not organized, and many production plants are forced to stop production.

Fireworks and firecrackers are very pretty in domestic and foreign markets, but the output of the lead yarn paper for the firecrackers and the fireworks is far from meeting the market demand, and the tensile strength of the lead yarn paper are relatively poor, so that the use of the lead yarn paper in the fields of the firecrackers and the fireworks is seriously influenced.

Disclosure of Invention

The invention aims to provide sulfur-free environment-friendly lead-wire yarn paper and a manufacturing process thereof, and the manufactured lead-wire yarn paper has relatively long service life; and it also has excellent tensile strength and tensile strength, effectively improving its quality. Furthermore, the invention effectively improves the whiteness and the touch of the lead yarn paper by carrying out single-end hypochlorite bleaching on the paper pulp. The manufactured lead yarn paper does not contain sulfur element, does not generate sulfur oxide after combustion to cause pollution to the atmosphere, and is relatively environment-friendly.

In order to achieve the purpose, the invention provides the following technical scheme:

the sulfur-free environment-friendly lead-in yarn paper consists of lead-in yarn paper and paraffin wax solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly lead-in yarn paper and water is 152-163 degrees.

Further, the preparation method of the paraffin solution comprises the following steps: dissolving a proper amount of paraffin in absolute ethyl alcohol to form a mixed component with the concentration of 8-18 g/L; then adding hot water at the temperature of 50-65 ℃ into the paraffin wax solution, and quickly stirring for 3-8 min to obtain the paraffin wax solution; wherein the adding amount of the hot water is 3.5-4.5% of the volume of the mixed components.

A process for manufacturing sulfur-free environment-friendly lead-in yarn paper comprises the following steps:

s1, weighing a proper amount of fresh mulberry bark, cleaning the surface of the fresh mulberry bark, cutting the fresh mulberry bark into long strips with the length of 1.5-2.5 cm by using a slicing machine, soaking the long strips in soft water for 4-7 hours, filtering the soaked strips, and drying the filtered strips in a constant-temperature drying oven;

s2, placing the dried mulberry bark into a steaming ball, adding a proper amount of alkali liquor into a steaming pot according to the solid-to-liquid ratio of 1: 3-4, slowly raising the temperature of the alkali liquor at a certain speed to 140-150 ℃, and soaking for 2-3 hours at the temperature in a heat preservation way; then, cold rotation is carried out for 15-25 min, steam is introduced to increase the pressure to 0.18-0.25 MPa, the mixture is soaked for 10-20 min under the pressure, steam is slowly released for 35-50 s, then the pressure is increased to 0.7-1.0 MPa through the steam, the mixture is subjected to heat preservation and cooking for 4-6 h under the pressure, and spraying is carried out after the heat preservation and cooking are finished;

s3, bleaching the pulp obtained in the step S2 by single-ended hypochlorite; wherein the concentration of paper pulp is 3.8-4.2% during bleaching treatment, the content of available chlorine is 2.4-3.2%, the bleaching temperature is set to 36-42 ℃, the bleaching time is set to 3-4 h, the pH value at the end point of bleaching is more than or equal to 8.5, and the obtained bleaching pulp is marked as bleaching pulp;

s4, delivering the bleached pulp obtained after bleaching into a pulping machine for pulping for 60-90 min to enable the beating degree of the pulp to reach 18-30 SR, then placing the pulp with the concentration of 0.75-0.85% into a refiner for homogenizing, and simultaneously adding a proper amount of dispersant to homogenize until the viscosity is 75-80S/20 ℃, thus obtaining mixed pulp;

s5, papermaking the mixed slurry obtained in the step S4 on a lateral flow type cylinder paper machine, drying the wet paper in a flood vat, coating the paper surface with paraffin solution during drying, and trial production of the prepared lead yarn paper to finally obtain the sulfur-free environment-friendly lead yarn paper finished product.

Further, the mulberry bark is dried in the step S1 until the water content is 70-80%, and the drying temperature is set to 60-70 ℃.

Furthermore, the alkali solution used in the step S2 is 20-25% of sodium hydroxide solution;

further, the temperature increase rate in the step S2 is 2-5 ℃/min.

Further, in the step S4, when beating is performed, the beating current is 80 to 100A.

Furthermore, the dispersant used in the step S4 is a polyacrylamide dispersant, and the amount of the dispersant is 3.5 to 4.2% of the weight of the slurry.

Furthermore, the working pressure of the drying cylinder in the step S5 is 1.5-3.0 kg/cm 2.

Further, the total coating amount of the paraffin solution in the step S5 is 10-12% of the weight of the finished paper.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, mulberry bark is taken as a raw material, and is sequentially treated by cutting, steaming, bleaching and other processes to finally prepare the high-yield pulp, and the high-yield pulp is taken as a basic raw material for preparing the yarn guiding paper, and a paraffin solution is taken as an auxiliary material to be coated on the surface of the high-yield pulp, so that the hydrophobic property of the high-yield pulp is greatly improved, the probability of moisture regain of the high-yield pulp is effectively reduced, and the service life of the high-yield pulp is prolonged.

2. According to the invention, the mulberry bark is used as a raw material, and a large amount of mulberry bast fibers exist in the manufactured lead yarn paper, so that the tensile strength and tensile strength of the manufactured lead yarn paper are obviously enhanced, and the quality of the lead yarn paper is effectively improved. Furthermore, the whiteness and the touch of the yarn threading paper are effectively improved by carrying out single-end hypochlorite bleaching on the paper pulp. The manufactured lead yarn paper does not contain sulfur element, does not generate sulfur oxide after combustion to pollute the atmosphere, is relatively environment-friendly, and is specially used for paper for fireworks and firecrackers leads.

Detailed Description

The embodiments described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making an invasive task, are within the scope of the present invention.

Example 1

The sulfur-free environment-friendly lead-in yarn paper consists of lead-in yarn paper and paraffin wax solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly lead-in yarn paper and water is 152 degrees.

The preparation method of the paraffin solution comprises the following steps: dissolving a proper amount of paraffin in absolute ethyl alcohol to form a mixed component with the concentration of 8 g/L; then adding hot water of 50 ℃ into the paraffin solution, and rapidly stirring for 3min to obtain the paraffin solution; wherein the amount of hot water added was 3.5% by volume of the mixed components.

A process for manufacturing sulfur-free environment-friendly lead-in yarn paper comprises the following steps:

s1, weighing a proper amount of fresh mulberry bark, cleaning the surface of the fresh mulberry bark, cutting the fresh mulberry bark into long strips with the length of 1.5cm by using a slicing machine, soaking the long strips in soft water for 4 hours, filtering the soaked long strips, and drying the filtered long strips in a constant-temperature drying box;

s2, placing the dried mulberry bark into a steaming ball, adding a proper amount of alkali liquor into a steaming pot according to the solid-to-liquid ratio of 1:3, slowly heating the temperature of the alkali liquor to 140 ℃ at a certain speed, and soaking for 2 hours at the temperature; then cold-rotating for 15min, introducing steam to increase the pressure to 0.18MPa, soaking for 10min under the pressure, slowly releasing steam for 35s, then increasing the pressure to 0.7MPa, preserving heat and cooking for 4h under the pressure, and spraying after the heat preservation and cooking is finished;

s3, bleaching the pulp obtained in the step S2 by single-ended hypochlorite; wherein, the concentration of paper pulp is 3.8 percent, the content of available chlorine is 2.4 percent, the bleaching temperature is set to be 36 ℃, the bleaching time is set to be 3 hours, the pH value at the end point of bleaching is 8.5, and the obtained pulp is marked as bleached pulp;

s4, delivering the bleached pulp obtained after the bleaching treatment into a beating machine for beating for 60min to enable the beating degree of the pulp to reach 18SR, then placing the pulp with the concentration of 0.75% into a refiner for homogenization, simultaneously adding a proper amount of dispersant, and homogenizing until the viscosity reaches 75S/20 ℃, thus obtaining mixed pulp;

s5, papermaking the mixed slurry obtained in the step S4 on a lateral flow type cylinder paper machine, drying the wet paper in a flood vat, coating the paper surface with paraffin solution during drying, and trial production of the prepared lead yarn paper to finally obtain the sulfur-free environment-friendly lead yarn paper finished product.

The mulberry bark was dried to a water content of 70% in step S1, and the drying temperature was set to 60 ℃.

The alkali liquor used in the step S2 is 20% sodium hydroxide solution;

the temperature increase rate in step S2 was 2 ℃/min.

When the beating is performed in step S4, the beating current is 80A.

The dispersant used in step S4 was a polyacrylamide dispersant, and the amount of dispersant used was 3.5% by weight of the slurry.

The working pressure of the drying cylinder in the step S5 is 1.5kg/cm²。

The total coating amount of the paraffin solution in step S5 was 10% by weight of the paper.

Example 2

The sulfur-free environment-friendly lead-in yarn paper consists of lead-in yarn paper and paraffin wax solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly lead-in yarn paper and water is 158 degrees.

The preparation method of the paraffin solution comprises the following steps: dissolving a proper amount of paraffin in absolute ethyl alcohol to form a mixed component with the concentration of 12 g/L; then adding hot water of 60 ℃ into the paraffin solution, and rapidly stirring for 35min to obtain the paraffin solution; wherein the amount of hot water added was 4.0% by volume of the mixed components.

A process for manufacturing sulfur-free environment-friendly lead-in yarn paper comprises the following steps:

s1, weighing a proper amount of fresh mulberry bark, cleaning the surface of the fresh mulberry bark, cutting the fresh mulberry bark into long strips with the length of 2.0cm by using a slicing machine, soaking the long strips in soft water for 5 hours, filtering the soaked long strips, and drying the filtered long strips in a constant-temperature drying box;

s2, placing the dried mulberry bark into a steaming ball, adding a proper amount of alkali liquor into a steaming pot according to the solid-to-liquid ratio of 1:3.5, slowly raising the temperature of the alkali liquor to 145 ℃ at a certain speed, and soaking for 2 hours at the temperature; then cold-rotating for 20min, introducing steam to increase the pressure to 0.20MPa, soaking for 15min under the pressure, slowly releasing steam for 40s, then increasing the pressure to 0.9MPa, preserving heat and cooking for 5h under the pressure, and spraying after the heat preservation and cooking is finished;

s3, bleaching the pulp obtained in the step S2 by single-ended hypochlorite; wherein, the concentration of paper pulp is 4.0 percent, the content of available chlorine is 2.8 percent, the bleaching temperature is set to be 40 ℃, the bleaching time is set to be 3 hours, the pH value at the end point of bleaching is 9.0, and the obtained pulp is marked as bleached pulp;

s4, delivering the bleached pulp obtained after the bleaching treatment into a beating machine for beating for 80min to enable the beating degree of the pulp to reach 25SR, then placing the pulp with the concentration of 0.80% into a refiner for homogenization, simultaneously adding a proper amount of dispersant, and homogenizing until the viscosity reaches 78S/20 ℃, thus obtaining mixed pulp;

s5, papermaking the mixed slurry obtained in the step S4 on a lateral flow type cylinder paper machine, drying the wet paper in a flood vat, coating the paper surface with paraffin solution during drying, and trial production of the prepared lead yarn paper to finally obtain the sulfur-free environment-friendly lead yarn paper finished product.

The mulberry bark was dried to a water content of 75% in step S1, and the drying temperature was set to 65 ℃.

The alkali liquor used in the step S2 is 22% sodium hydroxide solution;

the temperature increase rate in step S2 was 4 ℃/min.

When beating is performed in step S4, the beating current is 90A.

The dispersant used in step S4 was a polyacrylamide dispersant, and the amount of dispersant used was 3.8% by weight of the slurry.

The working pressure of the drying cylinder in the step S5 is 2.0kg/cm²。

The total amount of the coating of the paraffin solution in step S5 was 11% by weight of the paper.

Example 3

The sulfur-free environment-friendly lead-in yarn paper consists of lead-in yarn paper and paraffin wax solution uniformly coated on the surface of the lead-in yarn paper, and the contact angle between the surface of the sulfur-free environment-friendly lead-in yarn paper and water is 163 degrees.

The preparation method of the paraffin solution comprises the following steps: dissolving a proper amount of paraffin in absolute ethyl alcohol to form a mixed component with the concentration of 18 g/L; adding hot water of 65 ℃ into the paraffin solution, and rapidly stirring for 8min to obtain the paraffin solution; wherein the amount of hot water added was 4.5% by volume of the mixed components.

A process for manufacturing sulfur-free environment-friendly lead-in yarn paper comprises the following steps:

s1, weighing a proper amount of fresh mulberry bark, cleaning the surface of the fresh mulberry bark, cutting the fresh mulberry bark into long strips with the length of 2.5cm by using a slicing machine, soaking the long strips in soft water for 7 hours, filtering the soaked long strips, and drying the filtered long strips in a constant-temperature drying box;

s2, placing the dried mulberry bark into a steaming ball, adding a proper amount of alkali liquor into a steaming pot according to the solid-to-liquid ratio of 1:4, slowly heating the temperature of the alkali liquor to 150 ℃ at a certain speed, and soaking for 3 hours at the temperature; then cold-rotating for 25min, introducing steam to increase the pressure to 0.25MPa, soaking for 20min under the pressure, slowly releasing steam for 50s, then increasing the pressure to 1.0MPa, preserving heat and cooking for 6h under the pressure, and spraying after the heat preservation and cooking is finished;

s3, bleaching the pulp obtained in the step S2 by single-ended hypochlorite; wherein, the concentration of paper pulp is 4.2 percent, the content of available chlorine is 3.2 percent, the bleaching temperature is set to 42 ℃, the bleaching time is set to 4 hours, the pH value at the end point of bleaching is 10.0, and the obtained pulp is marked as bleaching pulp;

s4, delivering the bleached pulp obtained after the bleaching treatment into a beating machine for beating for 90min to enable the beating degree of the pulp to reach 30SR, then placing the pulp with the concentration of 0.85% into a refiner for homogenization, simultaneously adding a proper amount of dispersant, and homogenizing until the viscosity reaches 80S/20 ℃, thus obtaining mixed pulp;

s5, papermaking the mixed slurry obtained in the step S4 on a lateral flow type cylinder paper machine, drying the wet paper in a flood vat, coating the paper surface with paraffin solution during drying, and trial production of the prepared lead yarn paper to finally obtain the sulfur-free environment-friendly lead yarn paper finished product.

The mulberry bark was dried to a water content of 80% in step S1, and the drying temperature was set to 70 ℃.

The alkali liquor used in the step S2 is 25% sodium hydroxide solution;

the temperature increase rate in step S2 was 5 ℃/min.

When the beating is performed in step S4, the beating current is 100A.

The dispersant used in step S4 was a polyacrylamide dispersant, and the amount of dispersant used was 4.2% by weight of the slurry.

The working pressure of the drying cylinder in the step S5 is 3.0kg/cm²。

The total coating amount of the paraffin solution in step S5 was 12% by weight of the paper.

And (3) performance testing:

comparative example: a lead yarn paper produced by a lead yarn paper manufacturer in Hangzhou city, Zhejiang province;

test example: the lead yarn papers prepared by examples 1 to 3 of the present invention were referred to as test example 1, test example 2 and test example 3 in this order;

the following experiments were carried out for comparative examples and test examples 1, 2 and 3, respectively, and the data obtained are reported in the following table:

1. hydrophobic test: a small bubble was blown into the surface of the lead-wire papers provided in test examples 1, 2 and 3 or into the solid-liquid interface, and the contact angle was determined directly or after taking a photograph and then using a protractor. If θ <90 °, the solid surface is hydrophilic, i.e. the liquid wets the solid more easily, with smaller angles indicating better wetting; if θ >90 °, the solid surface is hydrophobic, i.e. the liquid does not easily wet the solid and easily moves over the surface.

2. Combustion experiments: two groups of the lead yarn paper provided in the test example 1, the test example 2 and the test example 3 are respectively taken, wherein one group is subjected to a combustion experiment, and smoke generated by combustion is detected to determine whether the smoke contains sulfur oxides. The other group of lead yarn paper is respectively placed in an environment with the air humidity of 80% for 2-3 months, and then a combustion experiment is carried out on the lead yarn paper; observing through eyes of meat whether the incense can be ignited;

3. respectively taking two groups of the lead yarn paper provided by the test example 1, the test example 2 and the test example 3 according to the GB/T457 standard to carry out tensile strength tests;

the experimental data obtained above are reported in the following table:

as can be seen from the relevant data in the table above, compared with the comparative example, the lead-wire tissue manufactured according to the technical scheme provided by the invention has relatively long service life; and the composite material also has excellent tensile strength and tensile strength, and the quality of the composite material is effectively improved. Furthermore, the invention effectively improves the whiteness and touch of the lead yarn paper by carrying out single-end hypochlorite bleaching on the paper pulp. The manufactured lead yarn paper does not contain sulfur element, does not generate sulfur oxide after combustion to pollute the atmosphere, and is relatively environment-friendly. Therefore, the lead yarn paper prepared by the invention has wider market prospect and is more suitable for popularization.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Rather, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.