CN114108188A

CN114108188A - PET (polyethylene terephthalate) dual-orientation melt-blown non-woven fabric and preparation process thereof

Info

Publication number: CN114108188A
Application number: CN202111257509.0A
Authority: CN
Inventors: 张勇彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-03-01

Abstract

The invention discloses a PET dual-orientation melt-blown non-woven fabric and a preparation process thereof, wherein the preparation process comprises the following steps: slicing and melting the PET raw material, putting the PET raw material into a melting furnace, melting the material and then extruding the material; spinning to form a net, spinning the melted material, and forming a net cloth on the moving base material by using the silk yarns through air flow; pressing the air, namely feeding the base material subjected to spinning into processing equipment, alternately feeding the base material into a hot air cavity and a cold air cavity, and generating periodic air pressure for downwards extruding the mesh fabric in the hot air cavity and the cold air cavity; and (5) cooling and forming, namely conveying the pressed base material and the mesh to a cooling cavity for cooling so as to be completely formed. According to the invention, the bonding of the silk threads is accelerated by air pressure, the silk threads are uniformly dispersed, and the bonding speed is improved and the effect of influencing the quality of a finished product due to nonuniform temperature reduction is avoided by alternately pressing the silk threads by cold air and hot air.

Description

PET (polyethylene terephthalate) dual-orientation melt-blown non-woven fabric and preparation process thereof

Technical Field

The invention relates to the technical field of PET non-woven fabrics, in particular to a PET dual-orientation melt-blown non-woven fabric and a preparation process thereof.

Background

Compared with the traditional weaving process, the melt-blown fabric is mainly manufactured in a mode of forming the fabric by naturally forming a net through air flow after melting and spinning the material, so that the melt-blown fabric has good filtering property, shielding property, heat insulation property and oil absorption property, and the PET bi-oriented melt-blown non-woven fabric, namely the PET non-woven fabric is manufactured by using PET as a raw material through melt-blowing technical means.

In the prior art, a process flow for preparing a PET (polyethylene terephthalate) bi-orientation melt-blown non-woven fabric is generally to melt PET raw material slices and then extrude and spray the PET raw material slices, a mesh fabric is formed on a base material by utilizing high-temperature air flow, and then the temperature is reduced, and silk threads are bonded by utilizing the waste heat of the sprayed yarn to prepare the non-woven fabric.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a PET (polyethylene terephthalate) dual-orientation melt-blown non-woven fabric and a preparation process thereof.

The invention provides a preparation process of PET (polyethylene terephthalate) bi-orientation melt-blown non-woven fabric, which comprises the following steps:

s1: slicing and melting the PET raw material, putting the PET raw material into a melting furnace, melting the material and then extruding the material;

s2: spinning to form a net, spinning the melted material, and forming a net cloth on the moving base material by using the silk yarns through air flow;

s3: pressing the air, namely feeding the base material subjected to spinning into processing equipment, alternately feeding the base material into a hot air cavity and a cold air cavity, and generating periodic air pressure for downwards extruding the mesh fabric in the hot air cavity and the cold air cavity;

s4: and (5) cooling and forming, namely conveying the pressed base material and the mesh to a cooling cavity for cooling so as to be completely formed.

Further, the treatment facility is including handling the case, the intermediate position of handling the incasement wall is fixed with the branch seat that the level was placed, and separates a top outer wall and handle and be fixed with a plurality of baffles between the incasement top inner wall, constitutes the hot-pressing chamber that has interval distribution and the chamber of colding pressing between the baffle, and the inner wall sliding connection in hot-pressing chamber has hot casting die, and the inner wall sliding connection in cold-pressing chamber has cold casting die, and the top of hot casting die and cold casting die all is connected with the cylinder telescopic link.

Further, the position that handles roof portion and hot-pressing chamber and cold-pressing chamber correspond all is connected with the breather pipe, the wearing groove of triangle-shaped structure is all seted up with the both ends and the both sides intermediate position of cold-pressing spare top outer wall to hot-pressing spare, the hot-pressing chamber is fixed with the shutoff piece with the position that cold-pressing intracavity wall corresponds with wearing groove, the air current groove has all been seted up to the position that the top of hot-pressing spare and cold-pressing spare is located between two adjacent wearing grooves, the both ends of air current groove penetrate out the wearing groove, the width of air current groove reduces to both ends from the intermediate position gradually, the air current groove sets the arc structure of intermediate position arch to being close to cylinder telescopic link one side.

Furthermore, the temperature of a plurality of hot pressing cavities is gradually reduced along the conveying direction, the temperature of the hot pressing cavity far away from the feeding side of the treatment box tends to the room temperature, the temperature of a plurality of cold pressing cavities is gradually reduced along the conveying direction, and the temperature of the cold pressing cavity close to the feeding groove of the treatment box tends to the room temperature.

Furthermore, the outer wall of the bottom of the hot pressing part is located between two adjacent through grooves and is provided with a first groove, the first groove extends along a diagonal line, the width of the first groove gradually increases towards the position close to the center of the hot pressing part, the depth of the first groove gradually increases towards the position close to the center of the hot pressing part, the outer wall of the bottom of the hot pressing part is located on two sides of the first groove and is provided with a plurality of second grooves, and the second grooves are arranged into arc-shaped structures which are arched towards the center.

Furthermore, a third groove with a circular cross section is formed in the center of the outer wall of the bottom of the cold pressing piece, a fourth groove is formed in the position, located between the two adjacent penetrating grooves, of the inner wall of the circumference of the third groove, the width of the fourth groove is gradually increased towards one end far away from the center, the depth of the fourth groove is gradually increased towards one end far away from the center, a fifth groove is formed in the position, corresponding to the penetrating grooves, of the inner wall of the circumference of the third groove, and the width of the fifth groove is gradually reduced towards one end close to the third groove.

Further, the processing incasement is located the below position that separates the seat and constitutes there is the cooling chamber, and rotates between the inner wall of cooling chamber both ends and be connected with the backing roll that the horizontal direction equidistance distributes, separates the position that seat top and hot-pressing chamber and cold-pressing chamber correspond and offers the mounting groove that pierces through the setting, and the inner wall of mounting groove is fixed with the flabellum mechanism of blowing downwards, and one side that the cooling chamber bottom is close to the feed roller is connected with out the tuber pipe.

Further, the fixed position that corresponds with the hot pressing chamber between the inner wall of cooling chamber both ends has the choke plate, and the choke plate sets up top and both ends open-ended box body structure, the vertical sliding connection of inner wall of choke plate has first otter board, be connected with a plurality of springs between the bottom outer wall of first otter board and the choke plate, the arc structure of both sides perk upwards is all set to choke plate and first otter board, the ventilation groove that has the equidistance of horizontal direction to distribute is all seted up on the both sides top of choke plate, cooling chamber one end is connected with the exhaust column with the position that the choke plate corresponds, the perforation that has the equidistance of horizontal direction to distribute is all seted up to the both sides bottom of choke plate.

Further, the fixed position that corresponds with the chamber of colding pressing between the inner wall of cooling chamber both ends has the dispersion aerofoil, and the dispersion aerofoil sets up the arc structure of both sides decurrent buckling, the embedded second otter board that is fixed with of intermediate position of dispersion otter board, the both sides of dispersion otter board all are fixed with the extension board, the arc structure of the side perk that makes progress is set to the extension board, the one side top that the extension board is close to the dispersion aerofoil is seted up the hole that leaks that the equidistance distributes, the one side that the extension board kept away from the dispersion aerofoil is seted up the through-hole that the equidistance distributes, the dispersion aerofoil top is located the both sides of second otter board and all sets up the disperse flume that the equidistance distributes.

The PET dual-orientation melt-blown non-woven fabric is prepared by adopting the preparation process of the PET dual-orientation melt-blown non-woven fabric.

The beneficial effects of the invention are as follows: the base material after will spouting the silk is sent into processing apparatus, and get into hot air chamber and air conditioning chamber in turn, produce the atmospheric pressure of periodic extrusion screen cloth downwards in hot gas strength and air conditioning intracavity, accelerate the silk thread bonding and make the silk thread homodisperse through atmospheric pressure, and through the pressfitting in turn of cold-hot wind, avoid influencing the effect of finished product quality because the cooling is inhomogeneous when improving bonding rate, the gas of top gathering pushes down fast downwards cooperation hot-pressing spare and the action of colding pressing spare downwards, and make the cold-hot motion air current in turn make the silk thread homodisperse, and utilize cold-hot in turn to avoid the silk thread to bond fast and produce the gathering, and utilize hot-pressing spare and colding pressing spare to follow the wear groove homodisperse of each position with the top air current, thereby improve the homogeneity of actual silk thread distribution, in order to improve the quality of preparing out the non-woven fabrics.

Drawings

FIG. 1 is a schematic overall flow chart of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 2 is a schematic structural view of a gas laminating apparatus of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 3 is a schematic plan sectional structure view of an apparatus of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 4 is a schematic top structure view of a hot press part of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 5 is a schematic view of the bottom structure of a hot press part of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 6 is a schematic view of the bottom structure of a cold pressing part of the preparation process of the PET bi-orientation melt-blown non-woven fabric provided by the invention;

FIG. 7 is a schematic structural view of a choke plate of a process for preparing a PET bi-oriented melt-blown nonwoven fabric according to the present invention;

FIG. 8 is a schematic structural view of a dispersion air plate of a preparation process of a PET bi-oriented melt-blown non-woven fabric provided by the invention.

In the figure: 1 treatment box, 101 feeding roller, 102 discharging roller, 2 separating seat, 3 partition board, 301 connecting roller, 4 hot pressing cavity, 5 cold pressing cavity, 6 hot pressing part, 601 first groove, 602 second groove, 7 cold pressing part, 701 third groove, 702 fourth groove, 703 fifth groove, 8 cylinder telescopic rod, 9 vent pipe, 10 plugging block, 11 through groove, 12 airflow groove, 13 cooling cavity, 14 bending roller, 15 supporting roller, 16 fan blade mechanism, 17 air outlet pipe, 18 choke plate, 19 first screen plate, 20 vent groove, 21 perforation, 22 dispersion air plate, 23 second screen plate, 24 extension plate, 2401 air leakage hole, 2402 through hole, 25 dispersion groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

Referring to fig. 1, a process for preparing a PET bi-oriented melt-blown nonwoven fabric comprises the following steps:

s3: the air pressing is carried out, the base material after the spinning is sent into processing equipment and alternately enters a hot air cavity and a cold air cavity, the air pressure for periodically and downwards extruding the mesh cloth is generated in the hot air cavity and the cold air cavity, the silk thread bonding is accelerated through the air pressure, the silk threads are uniformly dispersed, and the effect of influencing the quality of a finished product due to uneven cooling is avoided while the bonding speed is improved through the alternate pressing of cold air and hot air;

Referring to fig. 2-3, in the invention, the treatment equipment comprises a treatment box 1, wherein cover plates are detachably connected to two ends of the treatment box 1, a horizontally-placed separation seat 2 is fixed in the middle of the inner wall of the treatment box 1, a plurality of partition plates 3 are fixed between the outer wall of the top of the separation seat 2 and the inner wall of the top of the treatment box 1, a hot pressing cavity 4 and a cold pressing cavity 5 which are distributed at intervals are formed between the partition plates 3, two feeding rollers 101 are arranged at positions, corresponding to the partition plates 3, of the top of one side of the treatment box 1, two connecting rollers 301 are rotatably connected at positions, corresponding to the feeding rollers 101, of the partition plates 3, a hot pressing part 6 is slidably connected to the inner wall of the hot pressing cavity 4, a cold pressing part 7 is slidably connected to the inner wall of the cold pressing cavity 5, and cylinder telescopic rods 8 are connected to the tops of the hot pressing part 6 and the cold pressing part 7.

Referring to fig. 2-4, in the invention, the positions of the top of the treatment box 1 corresponding to the hot pressing cavity 4 and the cold pressing cavity 5 are both connected with a vent pipe 9, the two ends and the middle positions of the two sides of the top outer walls of the hot pressing piece 6 and the cold pressing piece 7 are both provided with through grooves 11 with triangular structures, the positions of the inner walls of the hot pressing cavity 4 and the cold pressing cavity 5 corresponding to the through grooves 11 are fixed with blocking blocks 10, the positions of the top of the hot pressing piece 6 and the cold pressing piece 7 between two adjacent through grooves 11 are both provided with airflow grooves 12, the two ends of the airflow grooves 12 penetrate through the through grooves 11, the width of the airflow grooves 12 is gradually reduced from the middle positions to the two ends, the airflow grooves 12 are arranged into arc structures with the middle positions arched towards one side close to the cylinder telescopic rod 8, actually, in the use process, the hot pressing piece 6 and the cold pressing piece 7 are both stopped at the positions of the blocking blocks 10 in advance, so that the top of the hot pressing piece 6 and the cold pressing piece 7 form a sealed cavity, utilize breather pipe 8 to let in steam and air conditioning to the cavity at hot pressing chamber 4 and the 5 tops of cold pressing chamber respectively, and make top atmospheric pressure be higher than the atmospheric pressure of normal environment, make hot pressing piece 6 and cold pressing piece 7 periodic descent in the twinkling of an eye and extrude the air cavity between and the screen cloth, the gas of top gathering pushes down cooperation hot pressing piece 6 and the action of cold pressing piece 7 downwards fast, and make cold and hot motion air current in turn make silk thread homodisperse, and utilize cold and hot in turn to avoid the silk thread to bond fast and produce the gathering, and utilize hot pressing piece 6 and cold pressing piece 7 to follow the wearing groove 11 homodisperse of each position with the top air current, thereby improve the homogeneity that actual silk thread distributes, in order to improve the quality of preparing out the non-woven fabrics.

PET (polyethylene terephthalate) dual-orientation melt-blown non-woven fabric and melt-blown non-woven fabric prepared by adopting preparation process of PET dual-orientation melt-blown non-woven fabric

Example 2

Embodiment 2 includes all the structures and methods of embodiment 1, referring to fig. 3, a process for preparing a PET bi-directional melt-blown nonwoven fabric, further comprising that the temperature of a plurality of hot pressing cavities 4 gradually decreases along the conveying direction, the temperature of the hot pressing cavity 4 far away from the feeding side of a processing box 1 tends to room temperature, the temperature of a plurality of cold pressing cavities 5 gradually decreases along the conveying direction, the temperature of the cold pressing cavity 5 near the feeding slot of the processing box 1 tends to room temperature, the hot pressing cavity 4 gradually decreases towards the far away from the feeding side, and the mesh fabric firstly enters the hot pressing cavity 4 to avoid the mesh fabric from directly contacting cold air to be rapidly bonded, the arrangement of the cold pressing cavity 5 near the feeding side tends to room temperature avoids the aggregation of silk threads caused by the overlarge direct temperature difference, thereby improving the operation effect of mesh fabric pressed by actually using gas, and the interval arrangement and temperature distribution of the hot pressing cavity 4 and the cold pressing cavity 5, and the contact temperature of the mesh cloth is alternately different in temperature and gradually reduced, so that the processing effect of cooling and bonding of actual silk threads in uniform distribution is improved, and the quality of finished non-woven fabrics is further improved.

Referring to fig. 5, in the present invention, a first groove 601 is formed on the outer wall of the bottom of a hot pressing member 6 between two adjacent through grooves 11, the first groove 601 extends along a diagonal line, the width of the first groove 601 gradually increases toward the center of the hot pressing member 6, the depth of the first groove 601 gradually increases toward the center of the hot pressing member 6, a plurality of second grooves 602 are formed on the outer wall of the bottom of the hot pressing member 6 at both sides of the first groove 601, the second grooves 602 are formed in an arc structure that is arched toward the center, when the hot pressing member 6 is separated from a block 10 during gas extrusion using the hot pressing member 6, the top hot gas passes through the through grooves 11, and the gas flow at the middle position is slower than the peripheral gas flow by using the depth change of the first groove 601, so that the hot gas flow is converged toward the middle along the outer wall of the bottom of the hot pressing member 6, and the gas flow is converged toward the middle position at the bottom of the hot pressing member 6 by using the width change of the second grooves 602 and the first groove 601, thereby, hot air flows from the periphery of the mesh cloth to the middle position, and the heat around the mesh cloth is uniformly distributed, thereby improving the operation effect of uniformly distributing and bonding the silk threads.

Referring to fig. 6, in the present invention, a third groove 701 with a circular cross section is formed in the center position of the outer wall of the bottom of the cold pressing piece 7, and a fourth groove 702 distributed along the diagonal line is formed in the position of the circumferential inner wall of the third groove 701 between two adjacent through grooves 11, the width of the fourth groove 702 gradually increases toward the end far from the center position, the depth of the fourth groove 702 gradually increases toward the end far from the center position, a fifth groove 703 is formed in the position of the circumferential inner wall of the third groove 701 corresponding to the through groove 11, the width of the fifth groove 703 gradually decreases toward the end near the third groove 701, actually when the cold pressing piece 7 is used for gas extrusion, when the cold pressing piece 7 leaves the plugging block 10, the top cold flow enters the third groove 701 along the through grooves 11 and the second groove 703, and is uniformly dispersed along the dispersed fourth groove 702 and in cooperation with the width change of the fourth groove 702, thereby when guaranteeing the silk thread evenly distributed bonding effect, improve the homodisperse effect of cold airflow to improve actual even heat dissipation cooling effect.

Example 3

Embodiment 3 includes all the structures and method parts of

embodiments

1 and 2, referring to fig. 2-3, a preparation process of a PET bi-directional melt-blown non-woven fabric, further includes that a cooling chamber 13 is formed in the processing box 1 at the lower position of the separating seat 2, two discharging rollers 102 are rotatably connected to the bottom of one side of the processing box 1 close to the feeding roller 101, a bending roller 14 is rotatably connected to the top and the bottom of one side of the inner wall of the two ends of the processing box 1 far away from the feeding roller 101, supporting rollers 15 are rotatably connected between the inner walls of the two ends of the cooling chamber 13 and are distributed at equal intervals in the horizontal direction, mounting grooves penetrating through are formed in the positions of the top of the separating seat 2 corresponding to the hot pressing chamber 4 and the cold pressing chamber 5, a fan blade mechanism 16 blowing downwards is fixed to the inner wall of the mounting grooves, the fan blade mechanism 16 includes a mounting barrel in which fan blades blowing downwards are arranged, the top and the bottom of installation section of thick bamboo all are fixed with the filter screen, one side that cooling chamber 13 bottom is close to feed roller 101 is connected with out tuber pipe 17, actually in the in-process of processing, make the screen cloth from the hot pressing chamber 4 and the cold pressing chamber 5 at top carry out gaseous pressfitting in proper order, then pass cooling chamber 13 from the below level, hot pressing chamber 4 and the air current that cold pressing chamber 5 produced downwards in turn drive fan mechanism 16 and blow down, and the air current that utilizes alternate motion carries out cooling radiating effect, realize energy-concerving and environment-protective with the make full use of energy, and utilize the temperature difference air current in turn to improve the cooling rate of screen cloth.

Referring to fig. 7, in the present invention, a choke plate 18 is fixed between inner walls of two ends of a cooling chamber 13 corresponding to a hot pressing chamber 4, the choke plate 18 is configured to be a box structure with openings at the top and two ends, a first net plate 19 is vertically and slidably connected to an inner wall of the choke plate 18, a plurality of springs are connected between an outer wall of the bottom of the first net plate 19 and the choke plate 18, the choke plate 18 and the first net plate 19 are both configured to be an arc structure with two sides raised upward, ventilation slots 20 are formed at top ends of two sides of the choke plate 18 and are distributed at equal intervals in the horizontal direction, an exhaust pipe is connected to a position corresponding to the choke plate 18 at one end of the cooling chamber 13, perforations 21 are formed at bottom ends of two sides of the choke plate 18 and are distributed at equal intervals in the horizontal direction, hot air blown out from the hot pressing chamber 4 during use impinges on the first net plate 19, and the operation of the exhaust pipe is performed by using the springs, most of hot air flow is extracted from the air extraction pipe, air flows at other positions of the cooling cavity 13 are introduced to the position below the first screen plate 19 and are dispersed by matching with the subsequent downward blowing air flow, so that the movement repeatability of the air flow in the cooling cavity 13 is increased, and the cooling efficiency of screen cloth below the choke plate 18 is improved.

Referring to fig. 8, in the present invention, a dispersing air plate 22 is fixed between inner walls of two ends of a cooling cavity 13 at a position corresponding to a cold pressing cavity 5, the dispersing air plate 22 is arranged in an arc structure with two sides bent downward, a second mesh plate 23 is fixed in the middle of the dispersing mesh plate 22 in an embedded manner, extending plates 24 are fixed on two sides of the dispersing mesh plate 22, the extending plates 24 are arranged in an arc structure with side edges tilted upward, air leakage holes 2401 distributed equidistantly are formed at the top of one side of the extending plate 24 close to the dispersing air plate 22, through holes 2402 distributed equidistantly are formed at one side of the extending plate 24 far from the dispersing air plate 22, the through holes 2402 correspond to the through holes 21, the through holes 2402 and the air leakage holes 2401 are distributed at intervals, dispersing grooves 25 distributed equidistantly are formed at two sides of the top of the dispersing air plate 22, which are located at two sides of the second mesh plate 23, the width of the dispersing grooves 25 gradually increases towards one side far from the second mesh plate 23, in practice, the arc-shaped structures of the dispersing air plates 22 and the extending plates 24 are arranged to uniformly disperse the air flow blown downwards from the cold pressing cavity 5 to two sides, and the air leakage holes 2401 are formed by matching with the width change of the dispersing grooves 25 to uniformly disperse, cool and bond the silk threads at the lower position, so that the quality of the finished non-woven fabric is enhanced, and the protecting and dispersing effects between the air flows are further enhanced by using the through holes 2402 and the through holes 21 at the corresponding positions.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A preparation process of PET bi-orientation melt-blown non-woven fabric is characterized by comprising the following steps:

2. The preparation process of the PET bi-orientation melt-blown non-woven fabric according to claim 1, wherein the treatment equipment comprises a treatment box (1), a horizontally placed separation seat (2) is fixed in the middle of the inner wall of the treatment box (1), a plurality of partition plates (3) are fixed between the outer wall of the top of the separation seat (2) and the inner wall of the top of the treatment box (1), hot pressing cavities (4) and cold pressing cavities (5) which are distributed at intervals are formed between the partition plates (3), the inner wall of the hot pressing cavity (4) is connected with a hot pressing part (6) in a sliding mode, the inner wall of the cold pressing cavity (5) is connected with a cold pressing part (7) in a sliding mode, and the tops of the hot pressing part (6) and the cold pressing part (7) are connected with cylinder telescopic rods (8).

3. The preparation process of PET bi-orientation melt-blown non-woven fabric according to claim 2, the air flow groove type hot pressing treatment device is characterized in that the positions, corresponding to the hot pressing cavity (4) and the cold pressing cavity (5), of the top of the treatment box (1) are connected with vent pipes (9), penetrating grooves (11) of a triangular structure are formed in the two ends of the outer wall of the top of the hot pressing part (6) and the outer wall of the top of the cold pressing part (7) and the middle positions of the two sides of the outer wall of the top of the hot pressing part (7), sealing blocks (10) are fixed at the positions, corresponding to the penetrating grooves (11), of the inner wall of the hot pressing cavity (4) and the inner wall of the cold pressing cavity (5), air flow grooves (12) are formed in the positions, located between the two adjacent penetrating grooves (11), the two ends of the air flow grooves (12) penetrate through the penetrating grooves (11), the width of the air flow grooves (12) is gradually reduced from the middle positions to the two ends, and the air flow grooves (12) are arranged into arc-shaped structures, wherein the middle positions are arched close to one side of an air cylinder telescopic rod (8).

4. The process for preparing a PET bi-oriented melt-blown non-woven fabric according to claim 3, wherein the temperature of the plurality of hot-pressing cavities (4) is gradually reduced along the conveying direction, the temperature of the hot-pressing cavity (4) far away from the feeding side of the treatment box (1) is close to the room temperature, the temperature of the plurality of cold-pressing cavities (5) is gradually reduced along the conveying direction, and the temperature of the cold-pressing cavity (5) close to the feeding groove of the treatment box (1) is close to the room temperature.

5. The preparation process of the PET bi-orientation melt-blown non-woven fabric according to claim 3 or 4, wherein a first groove (601) is formed in the position, between two adjacent through grooves (11), of the outer wall of the bottom of the hot pressing member (6), the first groove (601) extends along a diagonal line, the width of the first groove (601) is gradually increased towards the position close to the center of the hot pressing member (6), the depth of the first groove (601) is gradually increased towards the position close to the center of the hot pressing member (6), a plurality of second grooves (602) are formed in the position, on two sides of the first groove (601), of the outer wall of the bottom of the hot pressing member (6), and the second grooves (602) are arranged in an arc structure which is arched towards the center.

6. The preparation process of the PET bi-orientation melt-blown non-woven fabric according to claim 3 or 4, wherein a third groove (701) with a circular cross section is formed in the center of the outer wall of the bottom of the cold pressing piece (7), a fourth groove (702) is formed in the position, located between two adjacent through grooves (11), of the circumferential inner wall of the third groove (701), the width of the fourth groove (702) is gradually increased towards one end far away from the center, the depth of the fourth groove (702) is gradually increased towards one end far away from the center, a fifth groove (703) is formed in the position, corresponding to the through grooves (11), of the circumferential inner wall of the third groove (701), and the width of the fifth groove (703) is gradually decreased towards one end close to the third groove (701).

7. The preparation process of the PET bi-orientation melt-blown non-woven fabric according to claim 4, wherein a cooling cavity (13) is formed in the treatment box (1) at a position below the separating seat (2), supporting rollers (15) are rotatably connected between inner walls at two ends of the cooling cavity (13) and are distributed equidistantly in the horizontal direction, mounting grooves penetrating through the top of the separating seat (2) and corresponding to the hot pressing cavity (4) and the cold pressing cavity (5) are formed in positions, fan blade mechanisms (16) blowing downwards are fixed on the inner walls of the mounting grooves, and an air outlet pipe (17) is connected to one side, close to the feeding roller (101), of the bottom of the cooling cavity (13).

8. The preparation process of PET bi-orientation melt-blown non-woven fabric according to claim 7, it is characterized in that a choke plate (18) is fixed between the inner walls of the two ends of the cooling cavity (13) and at the position corresponding to the hot-pressing cavity (4), and choke plate (18) set to top and both ends open-ended box body structure, the vertical sliding connection of inner wall of choke plate (18) has first otter board (19), be connected with a plurality of springs between the bottom outer wall of first otter board (19) and choke plate (18), arc structure that both sides upwards perk is all set to choke plate (18) and first otter board (19), ventilation groove (20) that the horizontal direction equidistance distributes are all seted up on the both sides top of choke plate (18), the position that cooling chamber (13) one end and choke plate (18) correspond is connected with the exhaust column, perforation (21) that the horizontal direction equidistance distributes are all seted up to the both sides bottom of choke plate (18).

9. The preparation process of PET bi-orientation melt-blown non-woven fabric according to claim 7, it is characterized in that a dispersing air plate (22) is fixed between the inner walls of the two ends of the cooling cavity (13) and at the position corresponding to the cold pressing cavity (5), and dispersion aerofoil (22) set up the arc structure of both sides decurrent bend into, the embedded second otter board (23) that is fixed with in intermediate position of dispersion otter board (22), the both sides of dispersion otter board (22) all are fixed with extension board (24), the arc structure of the side perk that makes progress is set to extension board (24), leak wind hole (2401) that the equidistance distributes are seted up at one side top that extension board (24) are close to dispersion aerofoil (22), through-hole (2402) that the equidistance distributes are seted up to one side that dispersion aerofoil (22) were kept away from in extension board (24), dispersion wind board (22) top is located both sides of second otter board (23) and all sets up equidistance distribution's disperse groove (25).

10. The PET double-orientation melt-blown non-woven fabric is characterized in that the melt-blown non-woven fabric is prepared by adopting the preparation process of the PET double-orientation melt-blown non-woven fabric.