CN111560710A - Bidirectional electrostatic electret method for melt-blown non-woven fabric - Google Patents
Bidirectional electrostatic electret method for melt-blown non-woven fabric Download PDFInfo
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- CN111560710A CN111560710A CN202010430350.7A CN202010430350A CN111560710A CN 111560710 A CN111560710 A CN 111560710A CN 202010430350 A CN202010430350 A CN 202010430350A CN 111560710 A CN111560710 A CN 111560710A
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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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
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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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
- D06M10/025—Corona discharge or low temperature plasma
Abstract
The invention discloses a melt-blown non-woven fabric bidirectional electrostatic electret method, belonging to the technical field of new material processing, wherein the method comprises the steps of feeding a melt-blown non-woven fabric raw material into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the filtered melt into a spinning box, metering through a metering pump, continuously conveying the melt to a spinneret plate, and uniformly receiving and paving ultrafine fibers on a net through a conveying net curtain under the blowing of hot air flow to form the melt-blown non-woven fabric; the invention applies electrostatic charges on the front and back surfaces of the melt-blown non-woven fabric simultaneously, can greatly improve the implantation density of the electrostatic charges of the melt-blown non-woven fabric, enhance the coulomb force of the electrostatic charges and improve the quality of the melt-blown non-woven fabric.
Description
Technical Field
The invention belongs to the technical field of new material processing, and particularly relates to a bidirectional electrostatic electret method for melt-blown non-woven fabric.
Background
Protective masks have been widely used by hospital staff, laboratory researchers, construction workers, and the general public in high-pollution areas, during flu seasons, or when new epidemics occur.
The melt-blown non-woven fabric is used as a core material of the protective mask, and the filtering efficiency of the melt-blown non-woven fabric directly influences the protective effect of the mask. Therefore, the melt-blown filter material generally adds electrostatic charge effect to the melt-blown cloth through the electrostatic electret process, and the filtering efficiency is improved by using an electrostatic method.
The action principle of the melt-blown non-woven fabric mainly depends on the electrostatic action of the melt-blown non-woven fabric, and dust particles and virus and bacteria in the air are adsorbed, intercepted and captured so as to prevent toxic and harmful gases and solid particles from entering the human body through a respiratory tract and endangering the health of the human body. Meanwhile, the electrostatic charge coulomb force on the surface of the melt-blown non-woven fabric can kill viruses and bacteria in the air and play a certain role in protecting the health of human bodies.
In order to increase the electrostatic adsorption capacity of the melt-blown nonwoven fabric and improve the filtration efficiency, in the production process of the melt-blown nonwoven fabric, generally, in addition to mixing the electrostatic electret master batch into the raw materials, electrostatic charges must be applied to the surface of the melt-blown nonwoven fabric. However, electrostatic charge is applied to the front surface of the melt-blown non-woven fabric at present, in order to enable the filtering efficiency to reach 99%, the addition amount of the electrostatic electret master batch needs to be increased, the production cost of the melt-blown non-woven fabric is high, and meanwhile, the density of common polypropylene slices is generally 0.9g/cm3The density of the electrostatic electret master batch is generally larger, so that the electrostatic electret master batch generally sinks when being fed into a hopper though being stirred in the material mixing process. Particularly, the phenomenon is more obvious by adopting an automatic feeding machine, so that the electrostatic charge distribution on the surface of the melt-blown non-woven fabric is uneven, and the filtering efficiency of the protective mask is directly influenced. In the prior art, in order to improve the adsorption capacity of the melt-blown non-woven fabric, the corona discharge voltage is increased. Generally, the higher the voltage, the better the electrostatic effect of the melt-blown nonwoven tape, and the lower the voltage, the worse the electrostatic effect of the melt-blown nonwoven tape. However, too high a voltage can cause sparking and breakdown, which can cause melt holes in the meltblown nonwoven surface.
Disclosure of Invention
The invention aims to increase the electrostatic adsorption capacity of melt-blown non-woven fabric, enhance the electrostatic coulomb force sterilization and disinfection capacity and improve the filtration efficiency, and provides a bidirectional electrostatic electret method for melt-blown non-woven fabric.
In order to achieve the purpose, the invention adopts the following technical scheme: a melt-blown non-woven fabric bidirectional electrostatic electret method comprises melt-blown non-woven fabric raw material mixing, melt-blown technology and electret treatment, and is characterized in that: the flow of the melt-blown process comprises the following steps: feeding a melt-blown non-woven fabric raw material into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the filtered melt into a spinning box, metering the filtered melt through a metering pump, continuously conveying the melt to a spinneret plate, spraying the melt through spinneret holes, and forming superfine fibers under the blowing of hot air flow, wherein the superfine fibers are uniformly received by a conveying net curtain and laid on a net to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185-195 ℃, the second zone heating temperature is 200-205 ℃, the third zone heating temperature is 220-230 ℃, and the fourth zone heating temperature is 230-235 ℃; wherein, the first zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone; the electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 5-10 ten thousand volts; the back side electret voltage control range is 4-10 ten thousand volts, and the distances between the discharge corona wires or needle points positioned at two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric are 12-15 mm.
Wherein the melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary master batches, and fully mixing to obtain the melt-blown non-woven fabric raw material.
Wherein the superfine fiber is a fiber with the fineness of less than 0.3 denier.
Preferably, the front side electret voltage is greater than the back side electret voltage.
Through the design scheme, compared with the prior art, the invention can bring the following beneficial effects: the invention provides a melt-blown non-woven fabric bidirectional electrostatic electret method, which applies electrostatic charges on the front and back surfaces of melt-blown non-woven fabric simultaneously, can greatly improve the implantation density of the electrostatic charges of the melt-blown non-woven fabric, enhances the coulomb force of the electrostatic charges, improves the quality of the melt-blown non-woven fabric, and realizes the double 99-level filtration efficiency (the filtration efficiency of 0.3 micron dust particles and 2-5 micron viruses and bacteria reaches 99 percent), so that the melt-blown non-woven fabric prepared by the method is used as a filter layer of a protective mask, and is safer and more reliable.
Detailed Description
The invention provides a melt-blown non-woven fabric bidirectional electrostatic electret method, which comprises the steps of melt-blown non-woven fabric raw material mixing, melt-blown process and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary master batches, and fully mixing to obtain a melt-blown non-woven fabric raw material;
the electret master batch and the auxiliary agent master batch are commonly used in the existing melt-blown non-woven fabric preparation process, and are taken as the prior art, so that the design points of the invention are highlighted, and the details are not repeated here.
The flow of the melt-blown process comprises the following steps: feeding a melt-blown non-woven fabric raw material into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the filtered melt into a spinning box, metering the filtered melt through a metering pump, continuously conveying the melt to a spinneret plate, spraying the melt through spinneret holes, and forming superfine fibers under the blowing of hot air flow, wherein the superfine fibers are uniformly received by a conveying net curtain and laid on a net to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185-195 ℃, the second zone heating temperature is 200-205 ℃, the third zone heating temperature is 220-230 ℃, and the fourth zone heating temperature is 230-235 ℃; one zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, and realizing double 99-level filtering efficiency (the filtering efficiency of 0.3 micron dust particles, 2-5 micron viruses and bacteria reaches 99%), wherein the control range of the voltage of the front side electret is 5-10 ten thousand volts; the back side electret voltage control range is 4-10 ten thousand volts, and the distances between the discharge corona wires or needle points positioned at two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric are 12-15 mm. The front surface electret voltage is larger than the back surface electret voltage, and the filtering effect is better.
In the electret treatment process: firstly, implanting electrostatic charges on the front side and the back side of the melt-blown non-woven fabric simultaneously by adopting two 0-12 ten thousand volt electrostatic electret machines; secondly, implanting electrostatic charges by adopting tip corona discharge, wherein the distance between the tip of an electrode and the surface of the melt-blown non-woven fabric is 12-15 mm; the bidirectional electret voltage is 60-70% of single-side electret voltage; and fourthly, the mixing proportion of the electret master batch in the raw material of the melt-blown non-woven fabric is 65 to 75 percent of that of the conventional melt-blown non-woven fabric.
The invention adopts two electrostatic electret machines to implant electrostatic charges on the front and back surfaces of the melt-blown non-woven fabric. The method is used for implanting electrostatic charges into the melt-blown non-woven fabric in two directions, and aims to greatly improve the surface density of the electrostatic charges on the surface of the melt-blown non-woven fabric, enhance the electrostatic adsorption force of the melt-blown non-woven fabric, increase the coulomb force of the electrostatic charges and improve the killing efficiency of toxic and harmful gases and virus aerosol. Thereby promoting the grade of the melt-blown non-woven fabric and ensuring that the melt-blown non-woven fabric reaches grade double 99 (the filtering efficiency of 0.3 micron dust particles, 2-5 micron viruses and bacteria reaches 99%). The other layer of the bidirectional electret has the significance of reducing the mixing proportion of expensive electret master batches and reducing the production cost of melt-blown non-woven fabric. In order to ensure the product quality of the melt-blown non-woven fabric, high voltage is not needed any more, so that the phenomenon of uneven electrostatic charge distribution on the surface of the melt-blown non-woven fabric is overcome, and the phenomenon of forming melt holes due to the breakdown of the surface of the melt-blown non-woven fabric caused by the high voltage is avoided. Most importantly, the product cost is reduced, and the product quality is improved.
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below through embodiments with reference to the examples of the present invention, and it is obvious that the described examples are some examples of the present invention, but not all examples.
Example 1
A bidirectional electrostatic electret method for melt-blown non-woven fabric includes such steps as mixing raw materials of melt-blown non-woven fabric, melt-blowing and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary agent master batches, and fully mixing 95.5% of PP1500 conventional polypropylene slices, 3% of electret master batches and 1.5% of auxiliary agent master batches according to weight percentage to obtain the melt-blown non-woven fabric raw material.
The flow of the melt-blown process comprises the following steps: feeding the raw material of the melt-blown non-woven fabric into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the melt into a spinning box after filtering, metering the melt through a metering pump, continuously conveying the melt to a spinneret plate, arranging hot air spray pipes on two side surfaces of the spinneret plate, arranging hot air spray holes below the spinneret plate, spraying the fiber to form superfine fiber, and uniformly receiving and laying the superfine fiber on a net through a conveying net curtain to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185 ℃, the second zone heating temperature is 200 ℃, the third zone heating temperature is 220 ℃, and the fourth zone heating temperature is 230 ℃; one zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 5 ten thousand volts; the back side electret voltage control range is 4 ten thousand volts, and the distances between the discharge corona wires or needle points positioned at the two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric are 12 mm.
Example 2
A bidirectional electrostatic electret method for melt-blown non-woven fabric includes such steps as mixing raw materials of melt-blown non-woven fabric, melt-blowing and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary agent master batches, and fully mixing 96% of PP1500 conventional polypropylene slices, 2.5% of electret master batches and 1.5% of auxiliary agent master batches according to weight percentage to obtain the melt-blown non-woven fabric raw material.
The flow of the melt-blown process comprises the following steps: feeding the raw material of the melt-blown non-woven fabric into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the melt into a spinning box after filtering, metering the melt through a metering pump, continuously conveying the melt to a spinneret plate, arranging hot air spray pipes on two side surfaces of the spinneret plate, arranging hot air spray holes below the spinneret plate, spraying the fiber to form superfine fiber, and uniformly receiving and laying the superfine fiber on a net through a conveying net curtain to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185 ℃, the second zone heating temperature is 200 ℃, the third zone heating temperature is 220 ℃, and the fourth zone heating temperature is 230 ℃; wherein, the first zone is a high-temperature preheating zone, and the second zone is a high-temperature softening zone; the three zones are high-temperature melting zones; the fourth zone is a low-temperature spraying preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 8 ten thousand volts; the back side electret voltage control range is 7 ten thousand volts, and the distances between the discharge corona wires or needle points positioned at the two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric are 14 mm.
Example 3
A bidirectional electrostatic electret method for melt-blown non-woven fabric includes such steps as mixing raw materials of melt-blown non-woven fabric, melt-blowing and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary agent master batches, and fully mixing 96.5% of PP1500 conventional polypropylene slices, 2% of electret master batches and 1.5% of auxiliary agent master batches according to weight percentage to obtain the melt-blown non-woven fabric raw material.
The flow of the melt-blown process comprises the following steps: feeding the raw material of the melt-blown non-woven fabric into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the melt into a spinning box after filtering, metering the melt through a metering pump, continuously conveying the melt to a spinneret plate, arranging hot air spray pipes on two side surfaces of the spinneret plate, arranging hot air spray holes below the spinneret plate, spraying the fiber to form superfine fiber, and uniformly receiving and laying the superfine fiber on a net through a conveying net curtain to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185 ℃, the second zone heating temperature is 200 ℃, the third zone heating temperature is 220 ℃, and the fourth zone heating temperature is 230 ℃; one zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 10 ten thousand volts; the back side electret voltage control range is 10 ten thousand volts, and the distance between the discharge corona wires or needle points positioned at the two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric is 15 mm.
The larger the adding proportion of the electret master batch is, the smaller the electret voltage is, and the closer the distance between the corona electrode and the surface of the melt-blown non-woven fabric is. In order to prevent the phenomenon that the electret voltage is too high, sparks are formed, and the breakdown phenomenon is generated, so that the melt hole phenomenon can be generated on the surface of the melt-blown non-woven fabric, the larger the electret voltage is, the farther the distance between the corona electrode and the surface of the melt-blown non-woven fabric is.
Example 4
A bidirectional electrostatic electret method for melt-blown non-woven fabric includes such steps as mixing raw materials of melt-blown non-woven fabric, melt-blowing and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary agent master batches, and fully mixing 95.5% of PP1500 conventional polypropylene slices, 3% of electret master batches and 1.5% of auxiliary agent master batches according to weight percentage to obtain the melt-blown non-woven fabric raw material.
The flow of the melt-blown process comprises the following steps: feeding the raw material of the melt-blown non-woven fabric into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the melt into a spinning box after filtering, metering the melt through a metering pump, continuously conveying the melt to a spinneret plate, arranging hot air spray pipes on two side surfaces of the spinneret plate, arranging hot air spray holes below the spinneret plate, spraying the fiber to form superfine fiber, and uniformly receiving and laying the superfine fiber on a net through a conveying net curtain to form the melt-blown non-woven fabric; wherein the first zone heating temperature of the screw heating zone is 190 ℃, the second zone heating temperature is 202 ℃, the third zone heating temperature is 225 ℃, and the fourth zone heating temperature is 232 ℃; one zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 8 ten thousand volts; the back side electret voltage control range is 7 ten thousand volts, and the distance between the discharge corona wires or needle points positioned at the two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric is 13.5 mm.
Example 5
A bidirectional electrostatic electret method for melt-blown non-woven fabric includes such steps as mixing raw materials of melt-blown non-woven fabric, melt-blowing and electret treatment.
The melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary agent master batches, and fully mixing 95.5% of PP1500 conventional polypropylene slices, 3% of electret master batches and 1.5% of auxiliary agent master batches according to weight percentage to obtain the melt-blown non-woven fabric raw material.
The flow of the melt-blown process comprises the following steps: feeding the raw material of the melt-blown non-woven fabric into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the melt into a spinning box after filtering, metering the melt through a metering pump, continuously conveying the melt to a spinneret plate, arranging hot air spray pipes on two side surfaces of the spinneret plate, arranging hot air spray holes below the spinneret plate, spraying the fiber to form superfine fiber, and uniformly receiving and laying the superfine fiber on a net through a conveying net curtain to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 195 ℃, the second zone heating temperature is 205 ℃, the third zone heating temperature is 230 ℃, and the fourth zone heating temperature is 235 ℃; one zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone.
The electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 10 ten thousand volts; the back side electret voltage control range is 10 ten thousand volts, and the distance between the discharge corona wires or needle points positioned at the two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric is 15 mm.
Claims (4)
1. A melt-blown non-woven fabric bidirectional electrostatic electret method comprises melt-blown non-woven fabric raw material mixing, melt-blown technology and electret treatment, and is characterized in that: the flow of the melt-blown process comprises the following steps: feeding a melt-blown non-woven fabric raw material into a screw extruder through a feeding system, heating and melting a screw to form a melt, filtering the melt through a melt filter, feeding the filtered melt into a spinning box, metering the filtered melt through a metering pump, continuously conveying the melt to a spinneret plate, spraying the melt through spinneret holes, and forming superfine fibers under the blowing of hot air flow, wherein the superfine fibers are uniformly received by a conveying net curtain and laid on a net to form the melt-blown non-woven fabric; wherein, the first zone heating temperature of the screw heating zone is 185-195 ℃, the second zone heating temperature is 200-205 ℃, the third zone heating temperature is 220-230 ℃, and the fourth zone heating temperature is 230-235 ℃; wherein, the first zone is a high-temperature preheating zone, the second zone is a high-temperature softening zone, the third zone is a high-temperature melting zone, and the fourth zone is a low-temperature injection preparation zone; the electret treatment process comprises the following steps: carrying out bidirectional corona electret treatment on the front side and the back side of the melt-blown non-woven fabric to obtain the melt-blown non-woven fabric with electrostatic charges on the surface, wherein the control range of the voltage of the front side electret is 5-10 ten thousand volts; the back side electret voltage control range is 4-10 ten thousand volts, and the distances between the discharge corona wires or needle points positioned at two sides of the melt-blown non-woven fabric and the surface of the melt-blown non-woven fabric are 12-15 mm.
2. The melt-blown non-woven fabric bidirectional electrostatic electret method according to claim 1, characterized in that: the melt-blown non-woven fabric raw material mixing process comprises the following steps: respectively weighing PP1500 conventional polypropylene slices, electret master batches and auxiliary master batches, and fully mixing to obtain the melt-blown non-woven fabric raw material.
3. The melt-blown non-woven fabric bidirectional electrostatic electret method according to claim 1, characterized in that: the superfine fiber is a fiber with the fineness of less than 0.3 denier.
4. The melt-blown non-woven fabric bidirectional electrostatic electret method according to claim 1, characterized in that: the front side electret voltage is larger than the back side electret voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010430350.7A CN111560710A (en) | 2020-05-20 | 2020-05-20 | Bidirectional electrostatic electret method for melt-blown non-woven fabric |
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| CN202010430350.7A CN111560710A (en) | 2020-05-20 | 2020-05-20 | Bidirectional electrostatic electret method for melt-blown non-woven fabric |
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| CN111560710A true CN111560710A (en) | 2020-08-21 |
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| CN202010430350.7A Pending CN111560710A (en) | 2020-05-20 | 2020-05-20 | Bidirectional electrostatic electret method for melt-blown non-woven fabric |
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| CN112877910A (en) * | 2021-01-14 | 2021-06-01 | 宁波文泽机电技术开发有限公司 | Processing system and processing method for melt-blown non-woven fabric |
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Application publication date: 20200821 |