CN111021091A - Dispersible wet tissue material and preparation method and application thereof - Google Patents
Dispersible wet tissue material and preparation method and application thereof Download PDFInfo
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- CN111021091A CN111021091A CN201911117576.5A CN201911117576A CN111021091A CN 111021091 A CN111021091 A CN 111021091A CN 201911117576 A CN201911117576 A CN 201911117576A CN 111021091 A CN111021091 A CN 111021091A
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- wet tissue
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Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/18—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0011—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using non-woven fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
- D06N3/0036—Polyester fibres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2203/00—Macromolecular materials of the coating layers
- D06N2203/02—Natural macromolecular compounds or derivatives thereof
- D06N2203/024—Polysaccharides or derivatives thereof
- D06N2203/028—Starch or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2203/00—Macromolecular materials of the coating layers
- D06N2203/06—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06N2203/068—Polyurethanes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1607—Degradability
- D06N2209/1621—Water-soluble, water-dispersible
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/24—Personal care
Abstract
The invention relates to the technical field of wet tissue raw materials, in particular to a dispersible wet tissue material and a preparation method and application thereof, wherein the dispersible wet tissue material comprises the following raw materials: cotton, terylene, starch, anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water. The raw material of the wet tissue which is smooth in texture and not easy to damage is obtained by mixing the terylene and the cotton in a proper proportion; the corn flour is added, so that the material is easy to hydrolyze and is environment-friendly. The preparation method disclosed by the invention is simple to operate, convenient to control, high in production efficiency, low in production cost and suitable for large-scale production. The wet tissue or sanitary towel made of the dispersible wet tissue material can be quickly degraded, and has cotton and smooth texture.
Description
Technical Field
The invention relates to the technical field of wet tissue raw materials, in particular to a dispersible wet tissue material and a preparation method and application thereof.
Background
The market of Chinese wet tissues is in the blowout bedding period, and ice can be broken by a small thing to promote the growth of the whole industry.
The wet tissue is divided into two types according to the materials: one is wet strength paper, the other is non-woven fabric, most of the wet tissues are made of non-woven fabric, and the raw material non-woven fabric is mostly spunlaced. The spunlace non-woven fabric has the characteristic of long period in the natural degradation time. Therefore, a new raw material for wet wipes, which can be rapidly degraded, is urgently needed to be developed. In addition, the existing wet tissue material adopts terylene or cotton, the terylene wet tissue material is hard and smooth, and the cotton material is soft but easy to damage.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a dispersible wet tissue material, which is prepared by mixing terylene and cotton in a proper proportion to obtain a wet tissue raw material which is smooth in texture and not easy to damage; the corn flour is added, so that the material is easy to hydrolyze and is environment-friendly.
The invention also aims to provide a preparation method of the dispersible wet tissue material, which has the advantages of simple operation, convenient control, high production efficiency, low production cost and suitability for large-scale production.
The invention further aims to provide application of the dispersible wet tissue material.
The purpose of the invention is realized by the following technical scheme: a dispersible wet tissue material comprises the following raw materials in parts by weight:
40-80 parts of cotton;
10-40 parts of terylene;
10-40 parts of starch;
30-40 parts of anionic aliphatic polyester type polyurethane;
20-30 parts of fatty alcohol sulfate surfactant;
10-15 parts of water.
The raw material of the wet tissue which is smooth in texture and not easy to damage is obtained by mixing the terylene and the cotton in a proper proportion; the corn flour is added, so that the material is easy to hydrolyze and is environment-friendly. The wet tissue or sanitary towel made of the wet tissue raw material is soft and smooth, comfortable and environment-friendly.
Preferably, the dispersible wet tissue material comprises the following raw materials in parts by weight:
50-70 parts of cotton;
20-30 parts of terylene;
20-30 parts of starch;
35 parts of anionic aliphatic polyester polyurethane;
25 parts of fatty alcohol sulfate surfactant;
and 10 parts of water.
More preferably, the dispersible wet tissue material comprises the following raw materials in parts by weight:
60 parts of cotton;
30 parts of terylene;
20 parts of starch;
35 parts of anionic aliphatic polyester polyurethane;
25 parts of fatty alcohol sulfate surfactant;
and 10 parts of water.
Preferably, the starch is one or a mixture of two of corn starch and sweet potato starch.
A preparation method of a dispersible wet tissue material comprises the following steps:
a) putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
b) uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
c) uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
d) and (5) putting the mixture into an oven for baking, drying and rolling.
The preparation method of the dispersible wet tissue material has the advantages of simple operation, convenient control, high production efficiency and low production cost, and is suitable for large-scale production.
Further, the carding times in the process of a) are 3 times.
Further, the stirring speed of high-speed stirring in the b) process is 5000-7000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps;
the invention can rapidly adjust the viscosity of the slurry to 8000cps by controlling the rotating speed to be 5000-7000r/min, thereby effectively saving the time cost and the raw material cost.
Further, the viscosity of the starch slurry in the c) process is 5000-7000cps, and the temperature of the starch slurry is 30-50 ℃.
The invention keeps the temperature of the starch slurry at 30-50 ℃, so that the applied starch slurry is more uniform.
Further, the baking temperature in the d) process is 50-150 ℃, and the baking time is 20-80 min.
According to the invention, the drying temperature is adjusted to 50-150 ℃, and the drying time is 20-80min, so that the slurry is dried fully and uniformly, and the thickness of the dispersible wet tissue material is uniform.
An application of a dispersible wet tissue material in preparing wet tissue or sanitary towel is provided.
The invention has the beneficial effects that: the raw material of the wet tissue which is smooth in texture and not easy to damage is obtained by mixing the terylene and the cotton in a proper proportion; the corn flour is added, so that the material is easy to hydrolyze and is environment-friendly.
The preparation method of the dispersible wet tissue material has the advantages of simple operation, convenient control, high production efficiency and low production cost, and is suitable for large-scale production.
Wet tissues and sanitary towels prepared from the material are easy to hydrolyze and have moderate texture.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A dispersible wet tissue material comprises the following raw materials in parts by weight:
60 parts of cotton;
30 parts of terylene;
20 parts of starch;
35 parts of anionic aliphatic polyester polyurethane;
25 parts of fatty alcohol sulfate surfactant;
and 10 parts of water.
Preferably, the starch is one or a mixture of two of corn starch and sweet potato starch.
A preparation method of a dispersible wet tissue material comprises the following steps:
a) putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
b) uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
c) uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
d) and (5) putting the mixture into an oven for baking, drying and rolling.
Further, the carding times in the process of a) are 3 times.
Further, the stirring speed of high-speed stirring in the b) process is 5000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps;
further, the viscosity of the starch slurry in the c) process is 7000cps, and the temperature of the starch slurry is 50 ℃.
Further, the baking temperature in the d) process is 150 ℃, and the baking time is 20 min.
The wet tissue material prepared by the embodiment starts to degrade automatically in soil for 5 days, can degrade completely in 20-23 days on average, and has no harm to skin.
Example 2
A dispersible wet tissue material comprises the following raw materials in parts by weight:
40 parts of cotton;
10 parts of terylene;
10 parts of starch;
30 parts of anionic aliphatic polyester polyurethane;
20 parts of fatty alcohol sulfate surfactant;
and 10 parts of water.
Preferably, the starch is one or a mixture of two of corn starch and sweet potato starch.
A preparation method of a dispersible wet tissue material comprises the following steps:
a) putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
b) uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
c) uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
d) and (5) putting the mixture into an oven for baking, drying and rolling.
Further, the carding times in the process of a) are 3 times.
Further, the stirring speed of high-speed stirring in the b) process is 6000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps;
further, the viscosity of the starch slurry in the c) process is 6000cps, and the temperature of the starch slurry is 40 ℃.
Further, the baking temperature in the d) process is 100 ℃, and the baking time is 50 min.
The wet tissue material prepared by the embodiment starts to degrade automatically in soil for 3 days, can degrade completely in 18-20 days on average, and has no harm to skin.
Example 3
A dispersible wet tissue material comprises the following raw materials in parts by weight:
80 parts of cotton;
40 parts of terylene;
40 parts of starch;
40 parts of anionic aliphatic polyester polyurethane;
30 parts of fatty alcohol sulfate surfactant;
and 15 parts of water.
Preferably, the starch is one or a mixture of two of corn starch and sweet potato starch.
A preparation method of a dispersible wet tissue material comprises the following steps:
a) putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
b) uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
c) uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
d) and (5) putting the mixture into an oven for baking, drying and rolling.
Further, the carding times in the process of a) are 3 times.
Further, the stirring speed of high-speed stirring in the b) process is 7000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps;
further, the viscosity of the starch slurry in the c) process is 5000cps, and the temperature of the starch slurry is 40 ℃.
Further, the baking temperature in the d) process is 50 ℃, and the baking time is 80min
The wet tissue material prepared by the embodiment starts to degrade automatically in soil for 6 days, can degrade completely in 20-23 days on average, and has no harm to skin.
Example 4
A dispersible wet tissue material comprises the following raw materials in parts by weight:
70 parts of cotton;
35 parts of terylene;
30 parts of starch;
30 parts of anionic aliphatic polyester polyurethane;
25 parts of fatty alcohol sulfate surfactant;
and 10 parts of water.
Preferably, the starch is one or a mixture of two of corn starch and sweet potato starch.
A preparation method of a dispersible wet tissue material comprises the following steps:
a) putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
b) uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
c) uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
d) and (5) putting the mixture into an oven for baking, drying and rolling.
Further, the carding times in the process of a) are 3 times.
Further, the stirring speed of high-speed stirring in the b) process is 7000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps;
further, the viscosity of the starch slurry in the c) process is 6000cps, and the temperature of the starch slurry is 40 ℃.
Further, the baking temperature in the d) process is 150 ℃, and the baking time is 60 min.
The wet tissue material prepared by the embodiment starts to degrade automatically in soil for 5 days, can degrade completely in 20-22 days on average, and has no harm to skin.
From the above results, it can be seen that the flushable wet wipe materials prepared in examples 1 to 4 of the present invention have excellent degradability and comfortable texture without any damage to the skin.
Claims (8)
1. A dispersible wet tissue material is characterized in that: the feed comprises the following raw materials in parts by weight:
40-80 parts of cotton;
10-40 parts of terylene;
10-40 parts of starch;
30-40 parts of anionic aliphatic polyester type polyurethane;
20-30 parts of fatty alcohol sulfate surfactant;
10-30 parts of water.
2. The flushable wet wipe material of claim 1, wherein: the starch is one or a mixture of two of corn starch and sweet potato starch.
3. The process for producing a flushable moist wipe material as set forth in any one of claims 1-2, characterized in that: the method comprises the following steps:
putting cotton and terylene in proportion into a carding machine for carding and directly laying to form a base material 1;
uniformly mixing anionic aliphatic polyester polyurethane, fatty alcohol sulfate surfactant and water, stirring at a high speed to obtain slurry, and uniformly coating the slurry on the surface of the substrate 1 obtained in the step a) to form a substrate 2;
uniformly mixing starch with water to form starch slurry, and uniformly coating the starch slurry on the surface of the base material 2 obtained in the step b);
and (5) putting the mixture into an oven for baking, drying and rolling.
4. The method for preparing a dispersible wet wipe material as claimed in claim 3, wherein: the carding times in the process of a) are 3 times.
5. The method for preparing a dispersible wet wipe material as claimed in claim 4, wherein: the stirring speed of high-speed stirring in the b) process is 5000-7000r/min, and the stirring is carried out until the viscosity of the slurry is 8000 cps.
6. The method for preparing a dispersible wet wipe material as claimed in claim 5, wherein: the viscosity of the starch slurry in the c) process is 5000-7000cps, and the temperature of the starch slurry is 30-50 ℃.
7. The method for preparing a dispersible wet wipe material as claimed in claim 6, wherein: the baking temperature in the d) process is 50-150 ℃, and the baking time is 20-80 min.
8. Use of a flushable wipe material according to claims 1-2, characterized in that: it can be made into wet towel or sanitary towel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117576.5A CN111021091A (en) | 2019-11-15 | 2019-11-15 | Dispersible wet tissue material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117576.5A CN111021091A (en) | 2019-11-15 | 2019-11-15 | Dispersible wet tissue material and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111021091A true CN111021091A (en) | 2020-04-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911117576.5A Pending CN111021091A (en) | 2019-11-15 | 2019-11-15 | Dispersible wet tissue material and preparation method and application thereof |
Country Status (1)
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| CN1940174A (en) * | 2005-09-28 | 2007-04-04 | 东丽纤维研究所（中国）有限公司 | Production of coating fabrics with high-peneration and waterproofing functions |
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-
2019
- 2019-11-15 CN CN201911117576.5A patent/CN111021091A/en active Pending
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| CN107326536A (en) * | 2016-11-22 | 2017-11-07 | 上海缔荣纺织品有限公司 | Special-shaped polyester fiber and the composite spunlaced wet tissue cloth of wood pulp cellulose and preparation method thereof |
| CN108360146A (en) * | 2018-03-06 | 2018-08-03 | 张欢 | A kind of bamboo fiber nonwovens face layer of water-fast antibacterial and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 纺织导报: "《纺织导报》", 31 December 2017 * |
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Application publication date: 20200417 |