CN115573103A - Polypropylene filament geotextile for airport cement concrete pavement isolation layer and preparation method thereof - Google Patents
Polypropylene filament geotextile for airport cement concrete pavement isolation layer and preparation method thereof Download PDFInfo
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- CN115573103A CN115573103A CN202211552708.9A CN202211552708A CN115573103A CN 115573103 A CN115573103 A CN 115573103A CN 202211552708 A CN202211552708 A CN 202211552708A CN 115573103 A CN115573103 A CN 115573103A
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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
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
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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
- D04H3/08—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
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
- D06C7/02—Setting
Abstract
The invention belongs to the technical field of non-woven geotextiles, and discloses polypropylene filament geotextile for an airport cement concrete pavement isolation layer and a preparation method thereof. The method comprises the following steps: heating, melting and filtering polypropylene resin, and extruding the polypropylene resin through a spinneret plate to obtain melt trickle; the melt trickle is cooled by three-stage side blowing, drafted by air flow and mechanically swung to obtain a fiber net which is uniformly laid on a first net forming curtain; conveying the fiber web on the first web forming curtain to a second web forming curtain for through-air bonding treatment; and sequentially carrying out hot rolling to form cloth and cold rolling and sizing on the fiber web subjected to hot air penetrating bonding treatment to obtain the polypropylene filament geotextile. The polypropylene filament geotextile produced by the method meets the requirements of civil airport cement concrete surface course construction technical specifications on the isolation layer geotextile, and has short process flow and low energy consumption of products.
Description
Technical Field
The invention belongs to the technical field of non-woven geotextiles, and particularly relates to polypropylene filament geotextile for an airport cement concrete pavement isolation layer and a preparation method thereof.
Background
In recent years, airport construction is rapidly developed, the traffic volume of each airport is rapidly increased, the airplane load is increasingly large, the flying frequency is increasingly high, the cement concrete pavement bears the influences of climate change, cold and warm change, airplane takeoff and landing load impact abrasion, weathering and snow melting agent spraying on the runway by airport management departments in winter, the phenomena of surface pits, corner damage, plate fracture, plate bottom void and the like commonly exist on the pavement of the airport runway, the cracks of the runway plate are increased, and even the cracks are developed to cause plate fracture. However, reducing the comfort of use of the pavement has a greater impact on flight safety.
The surface layer repairing method of the cement concrete pavement at the present stage has various modes, and different repairing methods are generally adopted according to different repairing thicknesses. However, the maintenance of the road surface requires construction without stopping the navigation, the cost is high, the safety pressure is high, the time required by the conventional repairing method is long, the damage can be caused again in a short time even after the repairing, and the repeated process causes huge investment in manpower and material resources.
Through analysis, the airport pavement has the conditions of board bottom void, board fracture and the like, and has direct relation with the base layer and the isolation layer.
Therefore, the polypropylene filament geotextile for the isolation layer of the airport cement concrete pavement and the preparation method thereof are urgently needed to be provided, so that the damage of the airplane load to the concrete pavement is reduced, and the construction is convenient and quick.
Disclosure of Invention
The invention aims to provide polypropylene filament geotextile for an airport cement concrete pavement isolation layer and a preparation method thereof, aiming at the defects of the prior art. The polypropylene filament geotextile produced by the method meets the requirements of civil airport cement concrete surface course construction technical specifications on the isolation layer geotextile, and has short process flow and low energy consumption of products.
In order to achieve the above object, the present invention provides, in a first aspect, a method for preparing a polypropylene filament geotextile for an airport cement concrete pavement isolation layer, comprising the steps of:
s1: heating, melting and filtering polypropylene resin, and extruding the polypropylene resin through a spinneret plate to obtain melt trickle;
s2: cooling the melt thin stream by three-stage side blowing, drafting the melt thin stream by air flow and mechanically swinging the melt thin stream to obtain a fiber web, and uniformly paving the fiber web on a first web forming curtain;
s3: conveying the web on the first web forming curtain to a second web forming curtain for through-air bonding;
s4: and sequentially carrying out hot rolling cloth forming and cold rolling sizing on the fiber net subjected to hot air penetration bonding treatment to obtain the polypropylene filament geotextile for the airport cement concrete pavement isolation layer, and optionally winding and forming.
According to the present invention, preferably, the polypropylene resin has a melt index of 12 to 15g/10min.
According to the present invention, preferably, the heating and melting are performed by using a screw extruder, and the temperature of the heating and melting is 280-295 ℃.
According to the invention, the filtration is preferably carried out with a melt filter, which filters out impurities and colloidal particles.
According to the invention, the spinneret plate is provided with a plurality of rows of conical spinneret orifices and a plurality of rows of biconical spinneret orifices, and the plurality of rows of conical spinneret orifices and the plurality of rows of biconical spinneret orifices are arranged at intervals.
According to the invention, preferably, the multi-row conical spinneret orifice row group is 5-7 rows; each row of conical spinneret orifice group is provided with 8-12 conical spinneret orifices; the distance between two adjacent conical spinneret orifices is 6-7mm; the diameter of each conical spinneret orifice (i.e. the extrusion end) is 0.6-0.8mm, and the length-diameter ratio (4-5): 1.
According to the invention, preferably, the multi-row double-conical spinneret orifice row group is 5-7 rows; each row of the double-conical spinneret orifice group is provided with 8-12 double-conical spinneret orifices; the distance between two adjacent biconical spinneret orifices is 6-7mm; the diameter of each biconical spinneret orifice (namely an extrusion end) is 0.6-0.8mm, and the length-diameter ratio is (4-5): 1.
According to the invention, the distance between adjacent conical and biconic rows of orifices is preferably 6 to 7mm.
In the invention, the spinneret plate is designed to effectively solve the problems of fibers such as floating filaments, doubling filaments, defects and the like generated in the spinning process.
In the invention, because the selected polypropylene resin has low melt index and the aperture of the spinneret plate is large, the filament bundle is easy to be insufficiently cooled, and therefore, three-stage side blowing cooling is designed, and according to the invention, the height of a side blowing air window of the three-stage side blowing cooling is preferably 2.2-2.6m.
According to the present invention, preferably, the tertiary side-blow cooling includes primary cooling, secondary cooling, and tertiary cooling.
According to the invention, preferably, the primary cooling area is 45-55cm from the top of the side blowing air window to the bottom, the side blowing temperature is 20-23 ℃, and the side blowing air speed is 1.2-1.5m/s.
According to the invention, preferably, the secondary cooling area is an area between the primary cooling area and the tertiary cooling area, and is 110-130cm, the cross air blow temperature is 17-20 ℃, and the cross air blow speed is 1.5-1.7m/s.
According to the invention, preferably, the cooling area of the three-stage cooling is 65-75cm from the bottom of the side blowing air window to the top, the side blowing temperature is 14-17 ℃, and the side blowing air speed is 1.7-2.0m/s.
According to the invention, preferably, the pressure of the air flow drawing is 5.8-6.2bar, the monofilament fineness of the fiber yarn obtained by the three-stage cross air blow cooling and the air flow drawing is 15-18dtex, and the monofilament strength is more than or equal to 3.2cN/dtex.
In the present invention, a melt stream extruded from a spinneret is cooled by three stages of side-blowing and air-drafted to form solid fibers. The problem of insufficient cooling of coarse denier fiber (namely melt trickle) is solved by three-level side blowing cooling matched air draft, the crystallinity of the fiber is improved, the axial orientation degree of macromolecules along the fiber is improved, the breaking strength of the fiber is increased, and the wear resistance and the fatigue resistance are obviously improved. The isolation layer geotextile made of fibers spun by two types of spinneret orifices can meet the performance requirements of tensile strength and longitudinal and transverse tearing strength at 5 percent of elongation.
According to the invention, the first web forming curtain is preferably a receiving curtain, which is intended to receive the laid fibers and to lay the fibers uniformly into a fiber web, and the material of the receiving curtain is polyester.
According to the invention, the second web forming curtain is preferably a pre-reinforcing curtain, the purpose of which is to initially reinforce the loose fibre web with a certain tensile strength for further processing. The second net forming curtain is made of metal fibers.
According to the invention, preferably the first and second web forming curtains are arranged horizontally, the distance between the first and second web forming curtains being 5-8cm.
According to the invention, the horizontal working area of the second web forming curtain preferably has a length of 2.5-3.5m.
According to the invention, preferably, a hot air area is arranged in the horizontal working area of the second web forming curtain, the length of the hot air area is 0.5-1.5m, a hot air duct is arranged above the web forming curtain of the hot air area, and a heat absorbing air device is arranged below the web forming curtain of the hot air area; the temperature of hot air in the hot air duct is 165-170 ℃, and the blowing speed of hot air is 5.5-7.0m/s.
In the invention, the hot air suction device sucks hot air penetrating through the fiber web and the second wire forming curtain away and recycles the hot air. The heated fiber net surface is melted, fiber cross points are bonded, and the fiber net which is primarily bonded is conveyed to a hot rolling mill by a second wire forming curtain to be hot-rolled into cloth.
According to the invention, preferably, a cold air area is arranged in an area below the second web forming curtain, a cold air duct is arranged on one side of the web forming curtain of the cold air area, and a cold air suction device is arranged on the other side of the web forming curtain of the cold air area; the cold air duct cools the second net forming curtain to below 40 ℃.
In the invention, the cold air sucking device sucks the cold air penetrating through the second wire forming curtain and recycles the cold air.
According to the invention, preferably, the hot rolling equipment is a double-roller three-dimensional configuration hot rolling mill, the diameter of an upper roller and a lower roller is 1000-1500mm, heat conduction oil is introduced into the rollers, the surface temperature of the rollers is controlled to be 110-120 ℃, the linear pressure of the hot rolling mill is 65-80kg/cm, and the fiber web entering the hot rolling mill is in a 'one' shape.
According to the present invention, preferably, the fiber cloth is obtained after the fiber web after the through-air bonding treatment is subjected to the hot rolling to form a cloth.
According to the invention, preferably, the equipment for cold rolling and shaping is a cold rolling mill, the diameters of an upper roller and a lower roller are 400-600mm, cooling water is introduced into the rollers, the surface temperature of the rollers is controlled to be 30-40 ℃, the linear pressure of the cold rolling mill is 40-60kg/cm, and the fiber cloth entering the cold rolling mill is in an S-shaped cloth penetrating mode.
The invention provides the polypropylene filament geotextile for the airport cement concrete pavement isolation layer, which is prepared by the preparation method of the polypropylene filament geotextile for the airport cement concrete pavement isolation layer.
The technical scheme of the invention has the following beneficial effects:
(1) The polypropylene filament geotextile for the airport cement concrete pavement isolation layer provided by the invention has excellent acid and alkali resistance and large modulus, can effectively transfer impact stress to a foundation when an airplane takes off and lands, transfer load, ensure the integrity and the completion of functions of the isolation layer under the stress action of seasonal variation, thermal expansion and cold contraction, ensure pavement quality and pavement durability, and simultaneously has the advantages of convenience and rapidness in construction and reduction of construction period.
(2) The polypropylene filament geotextile produced by the method meets the requirements of civil airport cement concrete surface course construction technical specifications on the isolation layer geotextile, and has short process flow and low product energy consumption.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a process flow diagram of a method for preparing polypropylene filament geotextile for an airport cement concrete pavement isolation layer according to the present invention.
Fig. 2 is a schematic view showing spinneret holes of a spinneret plate used in the method for preparing the polypropylene filament geotextile for an airport cement concrete pavement isolation layer according to the present invention.
Fig. 3 is a schematic view showing a spinneret used in a method for preparing a polypropylene filament geotextile for an airport cement concrete pavement isolation layer according to the present invention.
Fig. 4 is a schematic view illustrating a three-stage side-blowing cooled side-blowing air window of the method for manufacturing a polypropylene filament geotextile for an airport cement concrete pavement isolation layer according to the present invention.
Fig. 5 is a schematic view showing the flow arrangement of the first net forming curtain, the second net forming curtain, the hot rolling cloth forming and the cold rolling shaping of the preparation method of the polypropylene filament geotextile for the airport cement concrete pavement isolation layer.
The reference numerals are explained below:
1. a conical spinneret orifice; 2. a biconical spinneret orifice; 3. a hot air duct; 4. a heat absorption wind device; 5. a cold air duct; 6. a cold air suction device; 7. hot rolling to form cloth; 8. cold rolling and shaping; A. one end of the horizontal work area of the second web forming; B. one end of the hot air zone; C. the other end of the hot air area; D. the other end of the horizontal work area of the second web forming screen; l1, the distance between the first net forming curtain and the second net forming curtain.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The embodiment provides a preparation method of polypropylene filament geotextile for an airport cement concrete pavement isolation layer, as shown in fig. 1, the method comprises the following steps:
s1: selecting polypropylene resin with a melt index of 13g/10min, heating and melting in a screw extruder, wherein the temperature of the screw extruder is 285-295 ℃, filtering impurities and colloidal particles from the melted melt through a melt filter, feeding the melt into a spinning manifold, and extruding through a spinneret plate to obtain melt trickle;
as shown in fig. 2 and 3, the spinneret plate is provided with a plurality of rows of conical spinneret holes and a plurality of rows of biconical spinneret holes, and the plurality of rows of conical spinneret holes and the plurality of rows of biconical spinneret holes are arranged at intervals.
The rows of the conical spinneret orifices are 6 rows; each row of conical spinneret orifice groups are provided with 10 conical spinneret orifices; the distance between two adjacent conical spinneret orifices is 6.5mm; the aperture of each conical spinneret orifice is 0.7mm, and the length-diameter ratio is 4.5;
the rows of the double-conical spinneret orifices are 6; each row of the double-conical spinneret orifice groups is provided with 10 double-conical spinneret orifices; the distance between two adjacent biconical spinneret orifices is 6.5mm; the aperture of each biconical spinneret hole is 0.7mm, and the length-diameter ratio is 4.5.
The distance between two adjacent conical spinneret orifice rows and the distance between two adjacent biconical spinneret orifice rows is 6.5mm.
S2: the melt thin stream is cooled by three-stage side blowing and drafted by air flow to form solid fibers, and then the solid fibers are subjected to mechanical yarn swinging to obtain a fiber net which is uniformly laid on a first net forming curtain;
as shown in fig. 4, the height of the side blow air window of the three-stage side blow cooling is 2.4m. The three-stage cross air blow cooling comprises primary cooling, secondary cooling and tertiary cooling.
The cooling area of the primary cooling is 50cm from the top of the side blowing air window to the lower part, the side blowing temperature is 21 ℃, and the side blowing air speed is 1.4m/s.
The secondary cooling area is an area between the primary cooling area and the tertiary cooling area, is 120cm, has a cross-blowing temperature of 19 ℃ and a cross-blowing wind speed of 1.6m/s.
The cooling area of the third-stage cooling is 70cm from the bottom of the side blowing air window, the side blowing temperature is 15 ℃, and the side blowing air speed is 1.8m/s.
The pressure of the air flow drafting is 5.8bar, the monofilament fineness of the fiber yarn obtained through the three-stage cross air blow cooling and the air flow drafting is 15dtex, and the monofilament strength is 3.4cN/dtex.
The first net forming curtain is made of polyester.
S3: conveying the web on the first web forming curtain to a second web forming curtain for through-air bonding;
the second net forming curtain is made of metal fibers.
As shown in fig. 5, the first web forming curtain and the second web forming curtain are horizontally arranged, and a distance L1 between the first web forming curtain and the second web forming curtain is 5-8cm.
The horizontal working area of the second web forming screen, i.e. a to D, has a length of 3m. A hot air area is arranged in a horizontal working area (namely from A to D) of the second web forming curtain, the length of the hot air area (namely from B to C) is 1m, a hot air duct 3 is arranged above the web forming curtain of the hot air area, and a hot air suction device 4 is arranged below the web forming curtain of the hot air area; the hot air temperature in the hot air duct 3 is 166 ℃, and the hot air blowing speed is 5.8m/s. A cold air area is arranged in an area below the second web forming curtain, a cold air duct 5 is arranged on one side of the web forming curtain of the cold air area, and a cold air sucking device 6 is arranged on the other side of the web forming curtain of the cold air area; the cold air duct 5 cools the second net forming curtain to below 40 ℃.
S4: and carrying out hot rolling on the fiber web subjected to hot air penetrating and bonding treatment to form cloth, thus obtaining the fiber cloth. And (3) cold rolling and shaping the fiber cloth to obtain the polypropylene filament geotextile for the airport cement concrete pavement isolation layer, and conveying the geotextile to a winding machine for winding and forming.
The hot rolling cloth forming equipment is a double-roller three-dimensional configuration hot rolling mill, the diameter of an upper roller and a lower roller is 1200mm, heat conducting oil is introduced into the rollers, the heat conducting oil is controlled by electric heating, the surface temperature of the rollers is controlled to be 115 ℃, the linear pressure of the hot rolling mill is 70kg/cm, and the fiber net entering the hot rolling mill is in a one-line shape.
The equipment for carrying out the cold rolling shaping is a cold rolling mill, the diameter of an upper roller and a lower roller is 500mm, cooling water is introduced into the rollers, the surface temperature of the rollers is controlled to be 35 ℃, the line pressure of the cold rolling mill is 50kg/cm, and the fiber cloth entering the cold rolling mill is in an S-shaped cloth penetrating mode.
Example 2
The present embodiment provides a method for preparing polypropylene filament geotextile for an airport cement concrete pavement isolation layer, which is different from embodiment 1 only in that:
selecting polypropylene resin with a melt index of 15g/10min;
the temperature of the screw extruder is 280-290 ℃;
the cooling area of the primary cooling is 50cm from the top of the side blowing air window to the lower part, the side blowing temperature is 22 ℃, and the side blowing air speed is 1.3m/s.
The secondary cooling area is an area between the primary cooling area and the tertiary cooling area, is 120cm, has a cross-blowing temperature of 20 ℃ and a cross-blowing wind speed of 1.5m/s.
The cooling area of the third-stage cooling is 70cm from the bottom of the side blowing air window, the temperature of the side blowing air is 17 ℃, and the air speed of the side blowing air is 1.7m/s.
The pressure of the air flow drafting is 6.2bar, the monofilament fineness of the fiber yarn obtained through the three-stage cross air blow cooling and the air flow drafting is 18dtex, and the monofilament strength is 3.3cN/dtex.
The temperature of hot air in the hot air duct 3 is 168 ℃, and the blowing speed of hot air is 6.5m/s.
The hot rolling cloth forming equipment is a double-roller three-dimensional configuration hot rolling mill, the diameters of an upper roller and a lower roller are 1200mm, hot oil is introduced into the rollers, the heat oil is controlled by electric heating, the surface temperature of the rollers is controlled to be 117 ℃, the linear pressure of the hot rolling mill is 75kg/cm, and the fiber net entering the hot rolling mill moves in a linear shape.
The equipment for carrying out the cold rolling shaping is a cold rolling mill, the diameter of an upper roller and a lower roller is 500mm, cooling water is introduced into the rollers, the surface temperature of the rollers is controlled to be 37 ℃, the line pressure of the cold rolling mill is 55kg/cm, and the fiber cloth entering the cold rolling mill is in an S-shaped cloth penetrating mode.
Test example
This test example the polypropylene filament geotextiles prepared in examples 1-2 were tested and the results are shown in table 1.
As can be seen from Table 1, the polypropylene filament geotextile prepared by the method meets the requirements of civil airport cement concrete surface course construction technical specifications on the isolation layer geotextile, and has the advantages of short process flow and low product energy consumption.
TABLE 1
While embodiments of the present invention have been described above, the above description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A preparation method of polypropylene filament geotextile for an airport cement concrete pavement isolation layer is characterized by comprising the following steps:
s1: heating, melting and filtering polypropylene resin, and extruding the polypropylene resin through a spinneret plate to obtain melt trickle;
s2: cooling the melt thin stream by three-stage side blowing, drafting by air flow and mechanically swinging to obtain a fiber web, and uniformly paving the fiber web on a first web forming curtain;
s3: conveying the web on the first web forming curtain to a second web forming curtain for through-air bonding;
s4: and sequentially carrying out hot rolling cloth forming and cold rolling sizing on the fiber net subjected to hot air penetration bonding treatment to obtain the polypropylene filament geotextile for the airport cement concrete pavement isolation layer, and optionally winding and forming.
2. The method for preparing polypropylene filament geotextile for airport cement concrete pavement isolation layer as claimed in claim 1,
the melt index of the polypropylene resin is 12-15g/10min;
heating and melting by using a screw extruder, wherein the heating and melting temperature is 280-295 ℃;
filtering by using a melt filter;
the spinneret plate is provided with a plurality of rows of conical spinneret orifice rows and a plurality of rows of biconical spinneret orifice rows, and the plurality of rows of conical spinneret orifice rows and the plurality of rows of biconical spinneret orifice rows are arranged at intervals.
3. The method of making a polypropylene filament geotextile for use in an airport cement concrete pavement insulation as defined in claim 2,
the rows of the conical spinneret orifices are 5-7 rows; each row of conical spinneret orifice group is provided with 8-12 conical spinneret orifices; the distance between two adjacent conical spinneret orifices is 6-7mm; the aperture of each conical spinneret orifice is 0.6-0.8mm, and the length-diameter ratio (4-5) is 1;
the multi-row double-conical spinneret orifice row group is 5-7 rows; each row of the double-conical spinneret orifice group is provided with 8-12 double-conical spinneret orifices; the distance between two adjacent biconical spinneret orifices is 6-7mm; the aperture of each biconical spinneret orifice is 0.6-0.8mm, and the length-diameter ratio (4-5) is 1;
the distance between the adjacent conical spinneret orifice row group and the biconical spinneret orifice row group is 6-7mm.
4. The method of making a polypropylene filament geotextile for use in an airport cement concrete pavement insulation as defined in claim 1,
the height of the side blowing air window for cooling the three-stage side blowing is 2.2-2.6m;
the three-stage cross air blow cooling comprises primary cooling, secondary cooling and tertiary cooling.
5. The method for preparing polypropylene filament geotextile for airport cement concrete pavement isolation layer as claimed in claim 4,
the cooling area of the primary cooling is 45-55cm from the top of the side blowing air window to the bottom, the side blowing temperature is 20-23 ℃, and the side blowing air speed is 1.2-1.5m/s;
the secondary cooling area is an area between the primary cooling area and the tertiary cooling area, the area is 110-130cm, the temperature of cross air blow is 17-20 ℃, and the air speed of the cross air blow is 1.5-1.7m/s;
the cooling area of the third-stage cooling is 65-75cm from the bottom of the side blowing air window, the side blowing temperature is 14-17 ℃, and the side blowing air speed is 1.7-2.0m/s.
6. The method for preparing polypropylene filament geotextile for an isolation layer of a cement concrete pavement for an airport according to claim 1, wherein the pressure of air draft is 5.8-6.2bar, the monofilament fineness of the fiber yarn obtained by the three-stage cross air blow cooling and air draft is 15-18dtex, and the monofilament strength is more than or equal to 3.2cN/dtex.
7. The method for preparing polypropylene filament geotextile for airport cement concrete pavement isolation layer as claimed in claim 1,
the first net forming curtain is made of polyester;
the second net forming curtain is made of metal fibers;
the first net forming curtain and the second net forming curtain are horizontally arranged, and the distance between the first net forming curtain and the second net forming curtain is 5-8cm;
the length of the horizontal working area of the second web forming curtain is 2.5-3.5m;
a hot air area is arranged in the horizontal working area of the second web forming curtain, the length of the hot air area is 0.5-1.5m, a hot air duct is arranged above the web forming curtain of the hot air area, and a heat absorbing air device is arranged below the web forming curtain of the hot air area; the temperature of hot air in the hot air duct is 165-170 ℃, and the blowing speed of hot air is 5.5-7.0m/s;
a cold air area is arranged in an area below the second net forming curtain, a cold air duct is arranged on one side of the net forming curtain of the cold air area, and a cold air sucking device is arranged on the other side of the net forming curtain of the cold air area; the cold air duct cools the second net forming curtain to below 40 ℃.
8. The method for preparing polypropylene filament geotextile for airport cement concrete pavement isolation layer as claimed in claim 1,
the hot rolling cloth forming equipment is a double-roller three-dimensional configuration hot rolling machine, the diameters of an upper roller and a lower roller are 1000-1500mm, heat conducting oil is introduced into the rollers, the surface temperature of the rollers is controlled to be 110-120 ℃, the linear pressure of the hot rolling machine is 65-80kg/cm, and the fiber net entering the hot rolling machine is in a one-line shape;
and the hot air penetrates through the fiber web after the bonding treatment to be subjected to hot rolling to form cloth, so that the fiber cloth is obtained.
9. The method for preparing polypropylene filament geotextile for an airport cement concrete pavement isolation layer according to claim 8, wherein the equipment for cold rolling and sizing is a cold rolling mill, the diameters of an upper roller and a lower roller are 400-600mm, cooling water is introduced into the rollers, the surface temperature of the rollers is controlled to be 30-40 ℃, the linear pressure of the cold rolling mill is 40-60kg/cm, and the fiber cloth entering the cold rolling mill is in an S-shaped cloth penetrating mode.
10. The polypropylene filament geotextile for an airport cement concrete pavement isolation layer prepared by the method of any one of claims 1 to 9 having a grammage of 140-145g/m 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211552708.9A CN115573103B (en) | 2022-12-06 | 2022-12-06 | Polypropylene filament geotextile for airport cement concrete pavement isolation layer and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211552708.9A CN115573103B (en) | 2022-12-06 | 2022-12-06 | Polypropylene filament geotextile for airport cement concrete pavement isolation layer and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115573103A true CN115573103A (en) | 2023-01-06 |
| CN115573103B CN115573103B (en) | 2023-02-28 |
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| CN202211552708.9A Active CN115573103B (en) | 2022-12-06 | 2022-12-06 | Polypropylene filament geotextile for airport cement concrete pavement isolation layer and preparation method thereof |
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| CN1060994A (en) * | 1990-10-24 | 1992-05-13 | 阿莫科公司 | Self-adhesive non-woven fibre web and mesh network film composite material |
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| CN115573103B (en) | 2023-02-28 |
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