CN111321522A - Production process of high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio - Google Patents
Production process of high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio Download PDFInfo
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- CN111321522A CN111321522A CN201910733080.4A CN201910733080A CN111321522A CN 111321522 A CN111321522 A CN 111321522A CN 201910733080 A CN201910733080 A CN 201910733080A CN 111321522 A CN111321522 A CN 111321522A
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- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 28
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 25
- -1 polypropylene Polymers 0.000 title claims abstract description 25
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000009987 spinning Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 241000207961 Sesamum Species 0.000 claims description 4
- 235000003434 Sesamum indicum Nutrition 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012943 hotmelt Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 240000001705 Striga asiatica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
- D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
- D04H3/045—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles for net manufacturing
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
- D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention discloses a production process of a high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio, which relates to the technical field of non-woven fabric production processes; it comprises the following steps: drying the raw materials; proportioning raw materials; high-temperature melt extrusion; metering: gauge for measuring pumpThe rotation rate of the grid is 250 cc/revolution, and the rotation rate is between 12 and 25 revolutions according to the gram weight; spinning: changing the included angle between the spinning beam and the web former, and making the strand silk cross lapping in MD direction by the 90 degree arrangement mode of the two spinning beams, so as to make the MD/CD value reach (1-1.2)/1; and (3) cooling: stable air with certain temperature and certain air quantity is blown into the cold air blowing box to cool the strand silk; the air volume is 6000-charge 12000m3H; air flow drafting; forming a net by using the net curtain; pre-pressing; hot rolling, wherein the temperature of the upper roller is 135-145 ℃, and the temperature of the lower roller is slightly lower than that of the upper roller by 1-3 ℃. The MD/CD values are nearly balanced; the non-woven fabric has equivalent longitudinal and transverse strength, reduces deformation factors in the using process and improves the strength requirement of the non-woven fabric.
Description
Technical Field
The invention belongs to the technical field of non-woven fabric production processes, and particularly relates to a production process of a high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio.
Background
The non-woven fabric product has the advantages of rich color, brightness, fashion, environmental protection, wide application, elegant appearance, various patterns and styles, light weight, environmental protection and recycling, and is internationally recognized as an environmental protection product for protecting the earth ecology.
The existing common non-woven fabric spinning box body is parallel to a web former without an angle, so that the number of filaments is more in the MD direction, and the MD/CD strength ratio after hot rolling is mostly (2-3)/1.
Table 1 is a prior art data statistic for 30 gram samples:
from table 1, it can be derived: transverse/longitudinal is 1: 2.02; the aspect ratio is different, the non-woven fabric has different strength in the longitudinal direction and the transverse direction in the using process, the deformation is easy to occur, and the like, and the improvement is needed.
Disclosure of Invention
In order to solve the problems existing in the background technology; the invention aims to provide a production process of a high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio.
The invention relates to a production process of a high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio, which comprises the following steps:
1. drying raw materials: selecting raw materials with a melt index (MFI) of more than 35 without special drying;
2. the raw material ratio is as follows: 0.4% of cooling master batch and 99.6% of polypropylene, wherein the cooling master batch is used for reducing the melting temperature;
3. high-temperature melt extrusion: melting the raw materials of the product at high temperature, and fully mixing the raw materials; temperature setting: 235 ℃ and 245 ℃;
4. filtering with a filter, and replacing the filter rod regularly, wherein the filter rod is replaced about 15 days generally; filtering impurities possibly existing in the molten raw materials through a filter;
5. metering: the raw materials are stably and quantitatively conveyed to a spinning box body through a metering pump, and the working procedure is a main means for controlling yield; the specification of a metering pump is 250 cc/revolution, and the rotation is 12-25 revolutions according to different gram weights;
6. spinning: uniformly paving the raw materials with stable and quantitative quantities on a spinneret plate through a spinning box body, forming certain high pressure, and enabling the melt to flow out through the spinneret plate to form a strip shape; changing the included angle between the spinning beam and the web former, and making the strand silk cross lapping in MD direction by the 90 degree arrangement mode of the two spinning beams, so as to make the MD/CD value reach (1-1.2)/1;
7. and (3) cooling: stable air with certain temperature and certain air quantity is blown into the cold air blowing box to cool the strand silk; according to different rotating speeds, the gas temperature is 16-25 ℃, and the air quantity is 6000-12000m3/h；
8. Airflow drafting: a certain amount of high-speed airflow passes through the drafting channel to draft the strand silk, so that the strand silk reaches the process fineness; the drawing airflow is 1500-;
9. forming a net curtain: after the strand silk reaches the process fineness, the strand silk is diffused through a diffuser, the speed of the strand silk is reduced, the strand silk can be uniformly paved on a net curtain, and an air draft device is arranged at the lower part of the net curtain to draw draft and cooling air flow away so as to avoid disturbing paving; the width of a diffusion upper opening is 45mm, the width of a contraction opening is 35mm, the width of a lower opening is 140mm, an air suction opening is 200mm, the suction air volume is slightly larger than the cold air volume, and the speed of a production line is 80-350 m/min;
10. pre-pressing: after being laid on the net curtain, the strand silk becomes loose and is reinforced by a pre-pressing stick at a certain temperature, so that the influence of the air flow of the surrounding environment and the air flow after high-speed running on the cloth cover can be borne; the temperature of the pre-pressing roller is 135-145 ℃;
11. hot rolling: the upper roll of the hot rolling mill is a high-temperature roll with certain grains, the lower roll of the hot rolling mill is a smooth high-temperature roll, the upper roll and the lower roll are occluded to generate certain pressure, and through the grains of a rolling point, strand silk is melted and extruded and is bonded together to achieve certain strength; the hot melting ratio of the upper roller is eighteen percent of small sesame points (which are parameters of the upper roller, patterns are engraved on the upper roller, the point patterns and the size of the patterns influence the physical properties of the cloth through the hot melting ratio to the roller and the size of the hot melting ratio of the formula), the temperature of the upper roller is 135 ℃ plus one year, and the temperature of the lower roller is slightly lower than that of the upper roller by 1-3 ℃.
Preferably, the raw material in step 1 may be monoliths 2040 polypropylene or ceridae 2040 polypropylene.
Preferably, the temperature in step 3 is set to 240-242 ℃.
Preferably, the temperature of the gas in the step 7 is generally 18-22 ℃, and the air volume is 6600-10000m3/h。
Preferably, the drawing method in step 8 is: wide slit negative pressure drafting, drafting speed: 2000 and 2500 m/min. To obtain a higher breaking tensile strength, a higher drawing speed is required to ensure that the fineness of the monofilaments reaches 1.8 denier.
Preferably, the line speed in step 9 is 160-300 m/min.
Preferably, the temperature of the pre-press roll in the step 10 is about 140 ℃.
Preferably, the cold air volume is set to be 6600m in the production process of the high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio3Per h, draft 8000m3The speed is 89m/min, the linear pressure of a rolling mill is 95N/mm, the temperature of an upper roll is 142 ℃, and the temperature of a lower roll is 139 ℃.
When the invention is operated, the longitudinal yarns are far more than the transverse yarns during lapping due to higher drafting speed, and the direction of the longitudinal yarns is changed by changing the included angle between the spinning component and the lapping machine, thus achieving the effect of changing the transverse strength.
The hot rolling process is the main factor influencing the strength of the non-woven fabric, and the roller with larger hot melting ratio (18%) is preferably selected, and the temperatures of the upper roller and the lower roller are preferably selected within the process temperature range.
The production line corresponding to the production process of the invention is provided with two spinning assemblies which are called ss spun-bonded non-woven fabric production lines, and the two spinning assemblies are respectively laid into a net, then are combined together and are hot-rolled to form the non-woven fabric of the process of the invention.
Compared with the prior art, the invention has the beneficial effects that:
the process is simple, convenient to operate, flexible and stable, the process is changed by changing the included angle between the spinning manifold and the web former, and the two spinning manifolds form a 90-degree arrangement mode, so that the strand silk is crossly lapped in the MD direction, and the MD/CD value is close to balance; the non-woven fabric has equivalent longitudinal and transverse strength, reduces deformation factors in the using process and improves the strength requirement of the non-woven fabric.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic flow diagram of the present invention;
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Example (b):
the first embodiment is as follows:
as shown in fig. 1, the following technical solutions are adopted in the present embodiment: it comprises the following steps:
1. drying raw materials: selecting raw material with melt index (MFI) above 35- -Sike 2040 polypropylene without special condition and drying;
2. the raw material ratio is as follows: 0.4% of cooling master batch and 99.6% of polypropylene, wherein the cooling master batch is used for reducing the melting temperature;
3. high-temperature melt extrusion of a large screw: melting the raw materials of the product at high temperature, and fully mixing the raw materials; temperature setting: 240 ℃;
4. filtering with a filter, and replacing the filter rod regularly, wherein the filter rod is replaced about 15 days generally; filtering impurities possibly existing in the molten raw materials through a filter;
5. metering: the raw materials are stably and quantitatively conveyed to a spinning box body through a metering pump, and the working procedure is a main means for controlling yield; the specification of a metering pump is 250 cc/revolution, and 20 g is 12 revolutions;
6. spinning: uniformly paving the raw materials with stable and quantitative quantities on a spinneret plate through a spinning box body, forming certain high pressure, and enabling the melt to flow out through the spinneret plate to form a strip shape; changing the included angle between the spinning beam and the web former, and making the strand silk cross lapping in MD direction by the 90 degree arrangement mode of the two spinning beams, so as to make the MD/CD value reach (1-1.2)/1;
7. and (3) cooling: stable air with certain temperature and certain air quantity is blown into the cold air blowing box to cool the strand silk; the gas temperature is 24 ℃, and the air quantity is 7800m3/h；
8. Airflow drafting: a certain amount of high-speed airflow passes through the drafting channel to draft the strand silk, so that the strand silk reaches the process fineness; the draft air flow is 1700 m/min;
9. forming a net curtain: after the strand silk reaches the process fineness, the strand silk is diffused through a diffuser, the speed of the strand silk is reduced, the strand silk can be uniformly paved on a net curtain, and an air draft device is arranged at the lower part of the net curtain to draw draft and cooling air flow away so as to avoid disturbing paving; the width of a diffusion upper opening is 45mm, the width of a contraction opening is 35mm, the width of a lower opening is 140mm, an air exhaust opening is 200mm, the air suction quantity is slightly larger than the cold air quantity, and the production line speed is 200 m/min;
10. pre-pressing: after being laid on the net curtain, the strand silk becomes loose and is reinforced by a pre-pressing stick at a certain temperature, so that the influence of the air flow of the surrounding environment and the air flow after high-speed running on the cloth cover can be borne; the temperature of the pre-pressing roller is 139 ℃;
11. hot rolling: the upper roll of the hot rolling mill is a high-temperature roll with certain grains, the lower roll of the hot rolling mill is a smooth high-temperature roll, the upper roll and the lower roll are occluded to generate certain pressure, and through the grains of a rolling point, strand silk is melted and extruded and is bonded together to achieve certain strength; and (3) carrying out hot melting on eighteen percent of small sesame points by an upper roller, wherein the temperature of an upper roller is 139 ℃, and the temperature of a lower roller is slightly lower than that of the upper roller by 2 ℃.
The spot check data of this example is shown in table 2:
table 2: statistical table of spot check data of 20 g product
Example two: as shown in fig. 1, the present embodiment includes the following steps:
1. drying raw materials: the raw material with a melt index (MFI) of more than 35, namely the striga asiatica 2040 polypropylene, is selected without being dried under special conditions;
2. the raw material ratio is as follows: 0.4% of cooling master batch and 99.6% of polypropylene, wherein the cooling master batch is used for reducing the melting temperature;
3. high-temperature melt extrusion: melting the raw materials of the product at high temperature, and fully mixing the raw materials; temperature setting: 240 ℃;
4. filtering with a filter, and replacing the filter rods periodically for 12 days; filtering impurities possibly existing in the molten raw materials through a filter;
5. metering: the raw materials are stably and quantitatively conveyed to a spinning box body through a metering pump, and the working procedure is a main means for controlling yield; the specification of a metering pump is 250 cc/revolution, and the product of 30 grams is 14 revolutions;
6. spinning: uniformly paving the raw materials with stable and quantitative quantities on a spinneret plate through a spinning box body, forming certain high pressure, and enabling the melt to flow out through the spinneret plate to form a strip shape; changing the included angle between the spinning beam and the web former, and making the strand silk cross lapping in MD direction by the 90 degree arrangement mode of the two spinning beams, so as to make the MD/CD value reach (1-1.2)/1;
7. and (3) cooling: stable air with certain temperature and certain air quantity is blown into the cold air blowing box to cool the strand silk; according to different rotating speeds, the gas temperature is 22 ℃, and the air quantity is 78000m3/h；
8. Airflow drafting: a certain amount of high-speed airflow passes through the drafting channel to draft the strand silk, so that the strand silk reaches the process fineness; the draft air flow is 1700 m/min;
9. forming a net curtain: after the strand silk reaches the process fineness, the strand silk is diffused through a diffuser, the speed of the strand silk is reduced, the strand silk can be uniformly paved on a net curtain, and an air draft device is arranged at the lower part of the net curtain to draw draft and cooling air flow away so as to avoid disturbing paving; the width of a diffusion upper opening is 45mm, the width of a contraction opening is 35mm, the width of a lower opening is 140mm, an air suction opening is 200mm, the suction air volume is slightly larger than the cold air volume, and the speed of a production line is 280 m/min;
10. pre-pressing: after being laid on the net curtain, the strand silk becomes loose and is reinforced by a pre-pressing stick at a certain temperature, so that the influence of the air flow of the surrounding environment and the air flow after high-speed running on the cloth cover can be borne; the temperature of the pre-pressing roller is 142 ℃;
11. hot rolling: the upper roll of the hot rolling mill is a high-temperature roll with certain grains, the lower roll of the hot rolling mill is a smooth high-temperature roll, the upper roll and the lower roll are occluded to generate certain pressure, and through the grains of a rolling point, strand silk is melted and extruded and is bonded together to achieve certain strength; and (3) hot melting eighteen percent of small sesame points by an upper roller, wherein the temperature of an upper roller is 143 ℃, and the temperature of a lower roller is slightly lower than that of the upper roller by 1-3 ℃.
The spot check data of this example is shown in table 3:
table 3: statistical table of spot check data of 30 g product
As shown in tables 2 and 3, the test data are obtained by taking four different positions of the nonwoven fabric, measuring the tension in the Machine Direction (MD) and the Cross Direction (CD), and then averaging; CD/MD ═ 1.12: 1.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The production process of the high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio is characterized in that: it comprises the following steps:
(1) and drying the raw materials: selecting raw materials with a melt index (MFI) of more than 35 without special drying;
(2) and the raw material ratio is as follows: 0.4% of cooling master batch and 99.6% of polypropylene, wherein the cooling master batch is used for reducing the melting temperature;
(3) and high-temperature melt extrusion: melting the raw materials of the product at high temperature, and fully mixing the raw materials; temperature setting: 235 ℃ and 245 ℃;
(4) filtering the mixture by a filter, and replacing the filter rod regularly, wherein the filter rod is replaced about 15 days generally; filtering impurities possibly existing in the molten raw materials through a filter;
(5) and metering: the raw materials are stably and quantitatively conveyed to a spinning box body through a metering pump, and the working procedure is a main means for controlling yield; the specification of a metering pump is 250 cc/revolution, and the rotation is 12-25 revolutions according to different gram weights;
(6) and spinning: uniformly paving the raw materials with stable and quantitative quantities on a spinneret plate through a spinning box body, forming certain high pressure, and enabling the melt to flow out through the spinneret plate to form a strip shape; changing the included angle between the spinning beam and the web former, and making the strand silk cross lapping in MD direction by the 90 degree arrangement mode of the two spinning beams, so as to make the MD/CD value reach (1-1.2)/1;
(7) and cooling: stable air with certain temperature and certain air quantity is blown into the cold air blowing box to cool the strand silk; according to different rotating speeds, the gas temperature is 16-25 ℃, and the air quantity is 6000-12000m3/h；
(8) And airflow drafting: a certain amount of high-speed airflow passes through the drafting channel to draft the strand silk, so that the strand silk reaches the process fineness; the drawing airflow is 1500-;
(9) and forming a net curtain into a net: after the strand silk reaches the process fineness, the strand silk is diffused through a diffuser, the speed of the strand silk is reduced, the strand silk can be uniformly paved on a net curtain, and an air draft device is arranged at the lower part of the net curtain to draw draft and cooling air flow away so as to avoid disturbing paving; the width of a diffusion upper opening is 45mm, the width of a contraction opening is 35mm, the width of a lower opening is 140mm, an air suction opening is 200mm, the suction air volume is slightly larger than the cold air volume, and the speed of a production line is 80-350 m/min;
(10) and pre-pressing: after being laid on the net curtain, the strand silk becomes loose and is reinforced by a pre-pressing stick at a certain temperature, so that the influence of the air flow of the surrounding environment and the air flow after high-speed running on the cloth cover can be borne; the temperature of the pre-pressing roller is 135-145 ℃;
(11) and hot rolling: the upper roll of the hot rolling mill is a high-temperature roll with certain grains, the lower roll of the hot rolling mill is a smooth high-temperature roll, the upper roll and the lower roll are occluded to generate certain pressure, and through the grains of a rolling point, strand silk is melted and extruded and is bonded together to achieve certain strength; the upper roller is used for hot melting eighteen percent of small sesame points, the temperature of the upper roller is 135-145 ℃, and the temperature of the lower roller is slightly lower than that of the upper roller by 1-3 ℃.
2. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: the raw material in the step (1) can be monoliths 2040 polypropylene or Siraceae 2040 polypropylene.
3. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: the temperature in (step 3) was set to 240-.
4. The machine of claim 1The production process of the high-strength polypropylene spun-bonded non-woven fabric with uniform transverse ratio is characterized in that: the temperature of the gas in the step (7) is generally 18-22 ℃, and the air quantity is 6600-10000m3/h。
5. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: the drawing method in the step (8) is as follows: wide slit negative pressure drafting, drafting speed: 2000 and 2500 m/min.
6. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: the line speed in the step (9) is 160-300 m/min.
7. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: the temperature of the pre-pressing roller in the step (10) is about 140 ℃.
8. The process for producing a high tenacity polypropylene spunbond nonwoven fabric with uniform aspect ratio as claimed in claim 1, wherein: in the step (10), the roller with a larger hot melt ratio is selected, and in the process temperature range, the temperature of the upper roller and the lower roller is preferably higher.
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| CN201910733080.4A CN111321522A (en) | 2019-08-09 | 2019-08-09 | Production process of high-strength polypropylene spun-bonded non-woven fabric with uniform aspect ratio |
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Application publication date: 20200623 |