CN112575397A - Spinneret plate, equipment and method for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabric - Google Patents
Spinneret plate, equipment and method for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabric Download PDFInfo
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- CN112575397A CN112575397A CN202011422964.7A CN202011422964A CN112575397A CN 112575397 A CN112575397 A CN 112575397A CN 202011422964 A CN202011422964 A CN 202011422964A CN 112575397 A CN112575397 A CN 112575397A
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- 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
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
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- 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
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
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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
- D04H3/009—Condensation or reaction polymers
- D04H3/011—Polyesters
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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
- D04H3/016—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the fineness
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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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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to a spinneret plate for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabric, which comprises a spinneret plate body, wherein a plurality of circular holes and a plurality of linear holes are formed in the spinneret plate body, the circular hole area is formed by the plurality of circular holes, the linear holes are formed by the plurality of linear holes, the circular hole area is positioned on the periphery of the linear hole area, the plurality of linear holes are arranged in an annular array, extension lines of the linear holes in the length direction pass through the circle center of the annular array, and the plurality of circular holes are also arranged in an annular array. A method of making a high grammage spunbond hot rolled nonwoven characterized by: the method comprises the following steps of PET raw material, air flow conveying, pre-crystallization, drying, melt spinning by a spinneret plate, side blowing cooling, air flow drafting, wire swinging and web forming, hot rolling reinforcement and winding. The special spinneret plate hole design of the same plate with different titer is adopted, and two kinds of spinneret holes with different sectional areas and different shapes are designed in the same spinneret plate, so that fibers with different titer (diameter) and different crystallinity can be spun.
Description
Technical Field
The invention relates to the field of non-woven fabric production, in particular to a spinneret plate, equipment and a method for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabric.
Background
The spunbond process, also known as spunlaid, is the most important and most widely used method in nonwovens. The non-woven fabric is made by using chemical fiber spinning principle, laying continuous filament fibers into a net in the polymer spinning process, and reinforcing the net by a mechanical, chemical or thermal method. The specific process is as follows:
the polymer slice is added into a hopper and then fed into a screw extruder, the screw has a heating function, the slice is melted and extruded in the screw, the filtered melt is conveyed to a spinning assembly by a metering pump according to a certain flow, the spinning assembly is provided with a spinneret plate with a plurality of small holes, the melt flows out of the small holes of the spinneret plate to form a plurality of thin flows, the thin flows of the melt are cooled into fibers after being blown by a side air, then the fibers enter a drafting device, the high-speed air flow in the drafting device is used for drafting, the macromolecules of the fibers are oriented and crystallized, the fibers obtain good mechanical properties, the fibers are laid on a net forming curtain with an air suction device below after being drafted, then the net forming curtain is conveyed to a reinforcing device and is reinforced by any one or two methods of hot rolling, chemical bonding, needle punching, water jet punching and the like, and the non-woven fabric.
In the production of the hot-rolled spunbonded nonwoven fabric, the delamination of the product is easy to occur as the grammage of the product increases, so that the production of the spunbonded nonwoven fabric using the thermoplastic polymer (such as PET) of a single component is difficult to perform for the production of the high grammage product, especially 250g/m2The above products.
The reason is that the temperature of the spun-bonded hot-rolled non-woven fabric is transferred to the fabric through a roller during hot rolling, so that a certain temperature difference exists between the outer layer and the inner layer of the fabric, and the higher the gram weight of the fabric is, the larger the temperature difference between the outer layer and the inner layer of the fabric is. When the temperature of the outer layer reaches the melting point of the nonwoven, the temperature of the inner layer will still be below the melting point. Thus, when a high grammage spunbond nonwoven is produced, the fibers of the inner layer still do not bond well and delamination occurs when good bonding occurs at the outer layer.
Disclosure of Invention
Aiming at the technical problems in the prior art, one of the purposes of the invention is as follows: a spinneret for manufacturing a high grammage spun-bonded hot-rolled nonwoven fabric is provided, which can be used in an apparatus for manufacturing a high grammage spun-bonded hot-rolled nonwoven fabric, which is a key component thereof.
Aiming at the technical problems in the prior art, the second purpose of the invention is as follows: an apparatus for manufacturing a high grammage spunbond hot-rolled nonwoven fabric is provided, which can be used to manufacture a high grammage spunbond hot-rolled nonwoven fabric.
Aiming at the technical problems in the prior art, the invention also aims to provide: the method for manufacturing the high-gram-weight spun-bonded hot-rolled non-woven fabric can avoid the layering phenomenon of the inner layer and the outer layer of the high-gram-weight spun-bonded hot-rolled non-woven fabric, and is suitable for manufacturing the high-gram-weight spun-bonded hot-rolled non-woven fabric.
In order to achieve the purpose, the invention adopts the following technical scheme:
the spinneret plate comprises a spinneret plate body, wherein a plurality of circular holes and a plurality of linear holes are formed in the spinneret plate body, the circular hole area is formed by the plurality of circular holes, the linear hole area is formed by the plurality of linear holes, the circular hole area is located on the periphery of the linear hole area, the plurality of linear holes are arranged in an annular array mode, the extension lines of the length directions of the plurality of linear holes all pass through the circle center of the annular array mode, and the plurality of circular holes are also arranged in the annular array mode.
Preferably, the ratio of the number of circular holes to the number of linear holes is: 10: 1-15: 1.
preferably, the ratio of the cross-sectional area of the circular hole to the cross-sectional area of the linear hole is 1: 6-1: 9.
the equipment for manufacturing the high-gram-weight spun-bonded hot-rolled non-woven fabric comprises a spinning box and a side blowing device, wherein a spinneret plate is arranged in the spinning box, a honeycomb rectifying plate is arranged in the side blowing device, and a plurality of layers of metal gauze are additionally arranged.
The method for manufacturing the high-gram-weight spunbonded hot-rolled non-woven fabric comprises the following steps of PET raw material conveying by air flow, pre-crystallization, drying, melt spinning by a spinneret plate, cooling by side blowing, air flow drafting, yarn swinging, web forming, hot rolling reinforcement and winding.
Further, the specific steps are that PET raw material slices are put into a feed barrel, impurities are screened out by a vibrating screen, pulse airflow generated by a fan is conveyed to a storage bin on the top of a building, and wet slices in the storage bin are conveyed by a rotary valve and fall into a pre-crystallizer; heating the slices in a pre-crystallizer, increasing the crystallinity and reducing the water content, and blowing the slices with higher crystallinity into a drying tower by hot air; the slices enter from the upper part of the drying tower and meet with the dehumidified hot air introduced from the bottom of the drying tower in the falling process, and the moisture in the slices is taken away by the hot air; conveying the slices with the water content meeting the spinning requirement to a dry slice hopper positioned above a screw extruder, dropping the slices into a mixing hopper under the action of gravity, mixing a certain amount of auxiliary agent and the slices according to a certain proportion through the mixing hopper, conveying the slices into the screw extruder, and melting, advancing and uniformly mixing the slices under the action of shearing and heating of the screw extruder; the pressure-stable melt is then filtered by a prefilter; the melt after filtration is conveyed into a spinning box body, the melt is reasonably distributed into each metering pump through the distribution of a melt distribution pipe, the melt with accurate volume is conveyed onto each spinning component through the metering pump, filter sand is filled in the spinning components and can further filter the melt, the filtered melt enters each small hole of a spinneret plate uniformly under the action of the distribution plate, the melt is uniformly divided into a plurality of strands of thin flows by the spinneret plate, and the thin flows are extruded from the small holes of the spinneret plate under the action of pressure and gravity and are exposed in the air; the melt stream is continuously cooled under the action of side blowing, the melt is converted into solid, and molecules in the melt generate certain crystallization and orientation under the action of drawing force and cooling to form fiber filaments with certain mechanical properties; compressed air adopted by the drafting spray head is sprayed downwards to form high-speed airflow after passing through an annular gap in the tubular drafting spray head, and a certain negative pressure area is formed above the drafting spray head to form a certain suction force on fibers; the fiber bundle after exiting the drafting tube is laid into a uniform fiber web under the action of a fiber splitter; the fiber web laid evenly and flatly is conveyed by a net forming curtain to be carried out hot rolling reinforcement in a hot rolling machine, and the non-woven fabric after hot rolling reinforcement is wound into a cloth roll with a certain length under the action of a winding machine.
Further, the pre-crystallization temperature is 110-160 ℃; the drying temperature is 105 ℃ and 150 ℃; the screw extruder is divided into six zones for heating, a resistance heating mode is adopted, and the temperature is set between 205 ℃ and 310 ℃;
further, the prefilter and the spinning beam are heated by biphenyl steam, and the temperature of the prefilter and the temperature of the beam are controlled to be between 280 ℃ and 310 ℃.
Further, the temperature of the cross air blow is controlled between 15 ℃ and 25 ℃. The air speed of the cross-blown air is controlled to be 0.25-0.45 m/s.
Furthermore, the main structure of the filament splitter is an airflow diffuser connected to the tail end of the drafting pipe, and the angle formed by the airflow diffuser and the advancing direction of the net forming curtain can be adjusted according to requirements.
In summary, the present invention has the following advantages:
1. the special spinneret plate hole design of the same plate with different titer is adopted, and two kinds of spinneret holes with different sectional areas and different shapes are designed in the same spinneret plate, so that fibers with different titer (diameter) can be spun.
2. Because the spun-bonded non-woven fabric adopts air flow drafting, fibers with different diameters are subjected to different drafting forces, so that the spinning speeds are different, the crystallinity of PET is different at different spinning speeds, the crystallinity of the fiber with higher spinning speed (small diameter) is higher, and the crystallinity of the fiber with lower spinning speed (large diameter) is lower. Because of the different crystallinity, the degree of melting of the fiber is different when the fiber is heated, the fiber with low crystallinity is obviously melted and plays a role in bonding, and the fiber with high crystallinity is less melted and plays a role in skeleton.
3. The cross section of the fiber with large diameter is in a straight shape, so that the fiber with the circular cross section has larger heated area and is easier to be heated under the same condition, and the fiber with the straight cross section has lower crystallinity, so the melting degree of the fiber is far greater than that of the fiber with the circular cross section at the same temperature. Thus, at the same temperature, the I-shaped fibers melt significantly, while the round fibers melt to a lesser degree.
4. Due to the action of the air-laid web, the straight fibers are distributed in disorder in the interior of the web. Therefore, although the temperature of the inner layer is lower than that of the surface, the straight fibers can be obviously fused and bonded, so that the layering phenomenon of a high-gram-weight product is avoided, and the high-gram-weight spun-bonded hot-rolled non-woven fabric can be produced smoothly to achieve the expected target.
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus for manufacturing a high grammage spunbonded hot-rolled nonwoven fabric according to the present invention.
Fig. 2 is a schematic view of an angle of a spinneret plate.
Wherein, fig. 1 and fig. 2 include:
1-material conveying device, 2-material bin, 3-pre-crystallizer, 4-drying tower, 5-screw extruder, 6-pre-filter, 8-metering pump, 9-spinning box, 10-spinneret plate, 101-circular hole region, 102-straight-line hole region, 11-side blowing window, 12-drafting spray head, 13-yarn separator, 14-net forming curtain, 15-hot rolling machine and 16-winding machine.
Detailed Description
The present invention will be described in further detail below.
As shown in fig. 2, a spinneret plate 10 for manufacturing a high-gram-weight spun-bonded hot-rolled non-woven fabric comprises a spinneret plate body, wherein a plurality of circular holes and a plurality of linear holes are formed in the spinneret plate body, the circular hole area 101 is formed by the plurality of circular holes, the linear hole area 102 is formed by the plurality of linear holes, the circular hole area 101 is located on the periphery of the linear hole area 102, the plurality of linear holes are arranged in an annular array, extension lines of the plurality of linear holes in the length direction pass through the circle center of the annular array, and the plurality of circular holes are also arranged in an annular array. The ratio of the number of the circular holes to the number of the linear holes is as follows: 10: 1-15: 1. the ratio of the cross-sectional area of the circular hole to the cross-sectional area of the linear hole is 1: 6-1: 9.
as shown in figure 1, the equipment for manufacturing the high-gram-weight spun-bonded hot-rolled non-woven fabric comprises a spinning box 9 and a side blowing device, wherein a spinneret plate 10 is arranged in the spinning box 9, a honeycomb rectifying plate is arranged in the side blowing device, and a plurality of layers of metal gauze are additionally arranged.
The production process flow of the high gram weight spun-bonded hot-rolled non-woven fabric is as follows:
PET (polyethylene terephthalate) raw material-air flow conveying-pre-crystallization-drying-special-shaped spinneret plate 10 melt spinning-side blowing cooling-air flow drafting-swinging silk-forming-hot rolling reinforcement-winding reinforcement
As shown in figure 1, the scheme adopts a material conveying device 1 for conveying the slices by adopting airflow, the slices are put into a material inlet barrel, impurities are screened out by a vibrating screen, and pulse airflow generated by a Roots blower is conveyed to a storage bin 2 on the roof. The wet chips in the silo 2 are transported by a rotary valve and fall into a pre-crystallizer 3.
In the pre-crystallizer 3, the slices are in a boiling state under the blowing of hot air, and the slices collide with each other to prevent bonding. The slice is heated in the pre-crystallizer 3, the crystallinity is increased, the water content is reduced, and the pre-crystallization temperature is 110-. The chips with higher crystallinity are blown into the drying tower 4 by hot air. The scheme adopts the filling type drying tower 4, the slices enter from the upper part of the drying tower 4 and meet with dehumidified hot air introduced from the bottom of the drying tower 4 in the falling process, the moisture in the slices is taken away by the hot air, and after the slices stay in the drying tower 4 for a long time, the moisture content of the slices reaches the requirement of spinning, and the drying temperature is 105-150 ℃.
The slices with the water content meeting the spinning requirement are conveyed to a dry slice hopper above the screw extruder 5, fall into a mixing hopper under the action of gravity, the mixing hopper is a material injection fluted disc driven by a motor at the bottom of a material receiver, the number of the slices is controlled through the rotating speed of the motor, and a certain amount of auxiliary agents and the slices are mixed according to a certain proportion and conveyed into the screw extruder 5 under the action of the mixing hopper. The screw extruder 5 is heated in six zones, a resistance heating mode is adopted, the temperature is set between 205 ℃ and 310 ℃, and cooling circulating water is arranged at the feed opening of the screw extruder 5 to prevent the slices from being annularly connected at the feed opening. The chips are melted and mixed uniformly while being advanced by shearing and heating in the screw extruder 5. When the end of the screw rod is reached, the slice is completely melted, the melt pressure is measured by a pressure sensor, and the rotating speed of the screw rod is controlled through the feedback of the pressure, so that the stability of the melt pressure is ensured.
The melt is melted and mixed evenly and completely, the melt with stable pressure is filtered by the pre-filter 6, and the pre-filter 6 can effectively remove inorganic impurities and gel particles in the melt so as to reduce the adverse effect of the impurities on the spinning process. The pre-filter 6 is switchable, and when the filtering pressure difference is larger, the old filter element is switched to a new filter element, so that the stability of the filtering effect is ensured.
The melt after pre-filtration is conveyed into a spinning box 9, a certain number of metering pumps 8 are arranged in the spinning box 9, and the melt is reasonably distributed into each metering pump 8 through distribution of a melt distribution pipe. The metering pump 8 is a precise gear pump, and the melt with precise volume is conveyed to each spinning assembly by the metering pump 8 through the rotation of the metering pump 8. The spinning pack contains filter sand for further filtering the melt, the filtered melt is uniformly fed into each small hole of the spinneret plate 10 by the distribution plate, and the melt is uniformly divided into a plurality of thin streams by the spinneret plate 10, extruded from the small holes of the spinneret plate 10 under the action of pressure and gravity, and exposed to air. The prefilter 6 and the spin box 9 are heated by biphenyl steam to ensure accurate temperature control. The temperature of the pre-filter 6 and the box body is controlled between 280 ℃ and 310 ℃.
As shown in fig. 2, the spinneret holes of the spinneret plate 10 are of the same-plate different-titer structure, the cross section of the spinneret hole in one spinneret plate 10 has a circular shape and a straight shape, and the number ratio of the circular holes to the straight shape holes is as follows: 10: 1-15: 1, and the ratio of the cross-sectional area of the circular hole to the cross-sectional area of the linear hole is 1: 6-1: 9, as shown in the attached drawings.
As shown in fig. 1, the melt stream is continuously cooled by the side-blowing, and the melt is transformed into a solid, and molecules in the melt generate certain crystallization and orientation under the action of the drawing force and the cooling, and become fiber filaments with certain mechanical properties. The temperature of the cross air is controlled by an air conditioner, and the temperature and the humidity of the air are accurately controlled, so that the distribution of the temperature and the tension of the fibers is reasonably controlled. The high-speed spinning is facilitated, and the temperature of the cross air blow is controlled to be 15-25 ℃. The air speed of the cross-blown air is controlled to be 0.25-0.45 m/s. The honeycomb rectifying plate is arranged in the side blowing window 11, and a plurality of layers of metal gauze screens are additionally arranged, so that the side blowing window can still keep a good laminar flow state at high wind speed.
The drafting process of the fiber is realized by the tubular drafting nozzles 12 below each spinning component, compressed air adopted by the drafting nozzles 12 is sprayed downwards to form high-speed airflow after passing through annular gaps inside the tubular drafting nozzles 12, and a certain negative pressure area is formed above the drafting nozzles 12 to form a certain suction force on the fiber. The fiber is sucked above the drafting nozzle 12, and moves downwards at a high speed along with the airflow under the action of the friction force of the high-speed airflow, the high-speed airflow and the fiber are limited in a drafting tube with a certain diameter and a certain length, and the fiber can be accelerated to the speed of 3000 plus 10000m/min in the drafting tube. The fiber speed is far higher than the speed of the melt flowing out of the spinneret plate hole, so that the melt is under stronger stretching action, the molecules are easy to orient and crystallize, the intermolecular force is greatly enhanced, and the fiber obtains excellent mechanical properties. The air flow speed generated by compressed air is fixed under a certain air pressure, the spinning speed which can be reached by the fiber in the drafting tube is greatly influenced by the filament number (specific surface area) of the fiber, the fiber with small fiber number is high in spinning speed due to large specific surface area and large friction force received in unit volume, and the fiber with large fiber number is low in spinning speed due to small specific surface area and small friction force received in unit volume. Therefore, in the same plate spinneret, the spinning speed of the fiber spun by the circular spinneret hole is different from that of the fiber spun by the linear spinneret hole due to the difference of the cross-sectional area and the shape of the spinneret hole. The fiber spun by the circular spinneret orifice has higher spinning speed (more than 6000m/min), so the fiber has higher crystallinity and better mechanical property, is not easy to melt and deform under the action of hot rolling temperature and pressure, and plays a role of a framework. The fiber spun by the straight spinneret orifices has low spinning speed (less than 4000m/min), so that the crystallinity of the fiber is low, and the fiber is easy to melt and deform under the action of hot rolling temperature and pressure to play a role in adhesion.
The fiber bundle after exiting the draft tube is laid into a uniform fiber web under the action of the fiber splitter 13. The main structure of the yarn splitter 13 is an airflow diffuser connected to the end of the draft tube, and the speed of the draft airflow is reduced and the static pressure is increased by increasing the cross section of the airflow diffuser. When the air velocity is slower than the drafted fiber velocity, an aerodynamic "hole effect" is created that causes the fiber bundles to naturally spread and fall in a spiral onto the web 14.
Since the angle of the air diffuser with respect to the direction of advance of the wire 14 can be adjusted as desired. Through the adjustment of the angle, the falling mode of the fibers is changed, so that the arrangement modes of the fibers in the longitudinal direction and the transverse direction are different, and the effect of changing the ratio of the longitudinal strength to the transverse strength of the product is achieved.
The laid uniform and flat fiber web is conveyed by a net forming curtain 14 to a hot rolling mill 15 for hot rolling reinforcement, and the non-woven fabric after hot rolling reinforcement is wound into a cloth roll with a certain length by the action of a winding machine 16.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A spinneret plate for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabric is characterized in that: the spinneret plate comprises a spinneret plate body, wherein a plurality of circular holes and a plurality of linear holes are formed in the spinneret plate body, the circular hole area is formed by the plurality of circular holes, the linear hole area is formed by the plurality of linear holes, the circular hole area is located on the periphery of the linear hole area, the plurality of linear holes are arranged in an annular array mode, the extension lines of the length directions of the plurality of linear holes all pass through the circle center of the annular array mode, and the plurality of circular holes are also arranged in the annular array mode.
2. A spinneret plate for producing a high grammage spunbond hot-rolled nonwoven fabric according to claim 1, wherein: the ratio of the number of the circular holes to the number of the linear holes is as follows: 10: 1-15: 1.
3. a spinneret plate for producing a high grammage spunbond hot-rolled nonwoven fabric according to claim 2, wherein: the ratio of the cross-sectional area of the circular hole to the cross-sectional area of the linear hole is 1: 6-1: 9.
4. an apparatus for making a high grammage spunbond hot rolled nonwoven characterized by: the spinneret plate comprises a spinning box and a side blowing device, wherein the spinning box is internally provided with the spinneret plate as claimed in any one of claims 1 to 3, and the side blowing device is internally provided with a honeycomb rectifying plate and is additionally provided with a plurality of layers of metal gauze.
5. A method of making a high grammage spunbond hot rolled nonwoven characterized by: the method comprises the following steps of PET raw material, air flow conveying, pre-crystallization, drying, melt spinning by a spinneret plate, side blowing cooling, air flow drafting, wire swinging and web forming, hot rolling reinforcement and winding.
6. A method of making a high grammage spunbond thermobonded nonwoven fabric as claimed in claim 5, wherein: the method comprises the following specific steps that PET raw material slices are put into a feeding barrel, impurities are screened out by a vibrating screen, pulse airflow generated by a fan is conveyed to a storage bin on the roof, and wet slices in the storage bin are conveyed by a rotary valve and fall into a pre-crystallizer; heating the slices in a pre-crystallizer, increasing the crystallinity and reducing the water content, and blowing the slices with higher crystallinity into a drying tower by hot air; the slices enter from the upper part of the drying tower and meet with the dehumidified hot air introduced from the bottom of the drying tower in the falling process, and the moisture in the slices is taken away by the hot air; conveying the slices with the water content meeting the spinning requirement to a dry slice hopper positioned above a screw extruder, dropping the slices into a mixing hopper under the action of gravity, mixing a certain amount of auxiliary agent and the slices according to a certain proportion through the mixing hopper, conveying the slices into the screw extruder, and melting, advancing and uniformly mixing the slices under the action of shearing and heating of the screw extruder; the pressure-stable melt is then filtered by a prefilter; the melt after filtration is conveyed into a spinning box body, the melt is reasonably distributed into each metering pump through the distribution of a melt distribution pipe, the melt with accurate volume is conveyed onto each spinning component through the metering pump, filter sand is filled in the spinning components and can further filter the melt, the filtered melt enters each small hole of a spinneret plate uniformly under the action of the distribution plate, the melt is uniformly divided into a plurality of strands of thin flows by the spinneret plate, and the thin flows are extruded from the small holes of the spinneret plate under the action of pressure and gravity and are exposed in the air; the melt stream is continuously cooled under the action of side blowing, the melt is converted into solid, and molecules in the melt generate certain crystallization and orientation under the action of drawing force and cooling to form fiber filaments with certain mechanical properties; compressed air adopted by the drafting spray head is sprayed downwards to form high-speed airflow after passing through an annular gap in the tubular drafting spray head, and a certain negative pressure area is formed above the drafting spray head to form a certain suction force on fibers; the fiber bundle after exiting the drafting tube is laid into a uniform fiber web under the action of a fiber splitter; the fiber web laid evenly and flatly is conveyed by a net forming curtain to be carried out hot rolling reinforcement in a hot rolling machine, and the non-woven fabric after hot rolling reinforcement is wound into a cloth roll with a certain length under the action of a winding machine.
7. A method of making a high grammage spunbond thermobonded nonwoven fabric as claimed in claim 6, wherein: the pre-crystallization temperature is 110-160 ℃; the drying temperature is 105 ℃ and 150 ℃; the screw extruder is divided into six zones for heating, a resistance heating mode is adopted, and the temperature is set between 205 ℃ and 310 ℃.
8. A method of making a high grammage spunbond thermobonded nonwoven fabric as claimed in claim 6, wherein: the prefilter and the spinning beam are heated by biphenyl steam, and the temperature of the prefilter and the beam is controlled between 280 ℃ and 310 ℃.
9. A method of making a high grammage spunbond thermobonded nonwoven fabric as claimed in claim 6, wherein: the temperature of the cross air blow is controlled between 15 ℃ and 25 ℃. The air speed of the cross-blown air is controlled to be 0.25-0.45 m/s.
10. A method of making a high grammage spunbond thermobonded nonwoven fabric as claimed in claim 6, wherein: the main structure of the filament separator is an airflow diffuser connected to the end of the drafting pipe, and the angle formed by the airflow diffuser and the advancing direction of the net forming curtain can be adjusted according to the requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114232216A (en) * | 2021-12-24 | 2022-03-25 | 广东宝泓新材料股份有限公司 | Method for manufacturing polyester spunbonded needle-punched non-woven filter material |
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