Apparatus for manufacturing a PET melt blown fiber web and method for manufacturing a PET melt blown fiber web using the same

Abstract

To provide a manufacturing device and method for PET melt blown fibers that can attempt to improve dimensional stability and productivity and can control the thickness of the fiber web.SOLUTION: There is provided a device for manufacturing a PET melt blown fiber web further including a heat treatment machine that presses and heat-treats a PET melt blown fiber web formed on a forming table, wherein the heat treatment machine includes: a porous pressure belt that presses the PET melt blown fiber web toward the forming table and transfers the PET melt blown fiber web to the winder side together with a porous circulation belt of the forming table; a hot air supply chamber that supplies high-temperature hot air to the PET melt blown fiber web to crystallize the PET melt blown fiber web that is pressed and transferred by the porous pressure belt; and height control means that controls height of the porous pressure belt for pressing the PET melt blown fiber web.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an apparatus for producing a PET meltblown fiber web and a method for producing a PET meltblown fiber web using the same. [Background technology]

[0002] The present invention provides background art related to the present invention, which does not necessarily mean that the art is publicly known. The meltblown process generally involves producing a fiber web using polypropylene (PP) as a raw material, and PP meltblown fiber webs are widely used in various high-performance filters, oil-absorbent fabrics, thermal insulation materials, sound-absorbing materials, etc.

[0003] However, polypropylene (PP) has a characteristic melting point of approximately 160°C, making it difficult to apply in industrial fields that require high heat resistance of 150°C or higher. To solve this problem, polyethylene terephthalate (PET) meltblown fiber webs, which have a melting point of approximately 255°C and are excellent in heat resistance, physical properties, and recyclability, are widely used.

[0004] However, PET meltblown fiber webs have a slower crystallization rate than other crystalline polymers, and shrinkage occurs around 70°C (near the glass transition temperature, Tg), making it difficult to immediately use in products without post-processing such as heat treatment.The reason for this shrinkage is that polymers have crystalline and amorphous regions, and the amorphous regions become mushy in the glass transition temperature range, causing them to lose their original shape and shrink.

[0005] Conventional heat treatment of PET meltblown fiber webs is carried out by applying hot air at a temperature of 100°C to 200°C on a forming table where the fiber web is collected.

[0006] However, when heat-treating a conventional PET melt blown fiber web, hot air is not uniformly transferred to the PET melt blown fiber web collected on the forming table at a uniform temperature, resulting in differences in crystallization rates. This not only causes differences in the dimensions and thickness of the PET melt blown fiber web produced thereby, but also has the problem that the fiber web is formed in a concave-convex shape. Further, there was another problem that the thickness of the fiber web produced during the heat treatment of the conventional PET melt blown fiber web could not be adjusted.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention is to provide an apparatus for manufacturing PET melt blown fibers that crystallizes a PET melt blown fiber web at a high speed to improve dimensional stability and productivity, and a method for manufacturing a PET melt blown fiber web using the same. An object of the present invention is to provide an apparatus for manufacturing PET melt blown fibers that enables adjustment of the thickness of the produced PET melt blown fiber web, and a method for manufacturing a PET melt blown fiber web using the same. Further, the problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention belongs from the following description. [Means for solving the problem]

[0009] A general summary of the invention is provided here, which should not be understood to limit the scope of the invention.

[0010] The apparatus for producing a PET meltblown fiber web of the present invention includes an extruder for melt-extruding a PET resin, a die for receiving the molten resin extruded by the extruder and emitting extremely thin PET meltblown fibers in the direction of its own weight, a forming table installed below the die and spaced apart to collect and gather the PET meltblown fibers to form a PET meltblown fiber web, a winder for winding up the PET meltblown fiber web, and a blending nozzle for blending PET short fibers with the PET meltblown fibers emitted toward the forming table. The web manufacturing apparatus includes a heat treatment machine that pressurizes and heat-treats a PET meltblown fiber web formed on a forming table. The heat treatment machine includes a perforated pressure belt that presses the PET meltblown fiber web toward the forming table and transports the PET meltblown fiber web toward the winder together with the perforated circulation belt of the forming table; a hot air supply chamber that supplies high-temperature hot air to the PET meltblown fiber web so that the PET meltblown fiber web being pressurized and transported by the perforated pressure belt is crystallized; and a height adjustment means that adjusts the height of the perforated pressure belt that pressurizes the PET meltblown fiber web.

[0011] In the apparatus for manufacturing PET melt blown fibers according to one aspect of the present invention, the porous pressure belt is provided by a mesh-like belt. The porous pressure belt is installed rotatably between a pair of belt frames on a carrier roller and a drive roller of a belt drive motor so as to be circulated and rotated. The porous pressure belt passing through the lower end side of the belt frame is installed to horizontally pass through carrier rollers installed lower than the lower end of the belt frame and on both sides of the lower end of the belt frame. The PET melt blown fiber web can be transferred to the winder side together with the porous circulation belt while pressing the surface of the PET melt blown fiber web toward the porous circulation belt side.

[0012] In the apparatus for manufacturing PET melt blown fibers according to one aspect of the present invention, the hot air supply chamber is installed between the belt frames so as not to interfere with the porous pressure belt and is filled with hot air blown from a hot air passage installed outside the heat treatment machine. A number of hot air injection nozzles for injecting hot air toward the PET melt blown fiber web side can be formed at the lower part of the hot air supply chamber.

[0013] In the apparatus for manufacturing PET melt blown fibers according to one aspect of the present invention, the height adjustment means is installed one or more on a height adjustment frame fixedly installed at a distance above the porous pressure belt. The height adjustment means can include a height adjustment servo motor installed in a gear box installed on the upper surface of the height adjustment frame and a lifting bar for lifting and lowering the porous pressure belt in conjunction with the height adjustment servo motor.

[0014] On the output shaft that rotates by the operation of the height adjustment servo motor, a pinion gear is installed. The lifting bar is installed in the gear box so as to be liftable. The lower end of the lifting bar passes through the height adjustment frame and is connected to the outer surface of the belt frame. On the lifting bar, a rack gear meshing with the pinion gear can be formed to extend along the length direction of the lifting bar.

[0015] The method for manufacturing PET melt blown fibers according to the present invention includes a spraying step of spraying a PET raw material in a melt blown manner to form PET melt blown fibers, a forming step of collecting and aggregating the PET melt blown fibers deposited on a porous circulating belt to form a PET melt blown fiber web, and a pressure heat treatment step of providing hot air at a high temperature while pressing the PET melt blown fiber web to crystallize the PET melt blown fiber web.

[0016] In the spraying step of the PET melt blown fibers in the method for manufacturing PET melt blown fibers according to another aspect of the present invention, the PET melt blown fibers are sprayed at a temperature of 270 to 330 ° C. at a speed of 25 to 60 m 3 / min and can be sprayed to have a diameter of 2 to 5 μm.

[0017] In the spraying step of the PET melt blown fibers in the method for manufacturing PET melt blown fibers according to another aspect of the present invention, PET staple fibers having a diameter of 15 to 40 μm are mixed with the sprayed PET melt blown fibers, and the PET staple fibers can be mixed with the PET melt blown fibers at a ratio of 3:7.

[0018] In the forming step of the PET melt blown fiber web in the method for manufacturing PET melt blown fibers according to another aspect of the present invention, the porous circulating belt is transferred at a speed of 1 to 10 m / min, and a PET melt blown fiber web having a weight of 100 to 700 g / m 2 can be formed on the porous circulating belt.

[0019] In the pressure heat treatment stage of the PET melt blown fiber web in the method for manufacturing PET melt blown fibers according to another aspect of the present invention, the porous pressure belt circulates and rotates at a speed of 1 to 10 m / min, circulates and rotates along the transfer direction of the PET melt blown fiber web, and the hot air supply chamber can inject hot air at a high temperature of 80 to 200 °C at a speed of 1 to 10 m 3 / min through the hot air injection nozzles.

[0020] In the pressure heat treatment stage of the PET melt blown fiber web in the method for manufacturing PET melt blown fibers according to another aspect of the present invention, the porous pressure belt forms a gap of 1 to 150 mm from the porous circulation belt, and can pressure-transfer the PET melt blown fiber web.

Advantages of the Invention

[0021] According to the present invention, since the collected fiber web is heat-treated while being pressurized, the fiber web can be crystallized at a uniform and high speed, and such shortening of the heat treatment time can improve the productivity of the PET melt blown fiber web. According to the present invention, since the collected fiber web is heat-treated while being pressurized, a PET melt blown fiber web having a uniform thickness can be manufactured. According to the present invention, since the pressurized height of the collected fiber web can be adjusted, a PET melt blown fiber web having various thicknesses can be manufactured.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0023] Hereinafter, embodiments of an apparatus for manufacturing a PET melt blown fiber web according to the present invention and a method for manufacturing a PET melt blown fiber web using the same will be described in detail with reference to the drawings.

[0024] It should be clarified that the essential technical idea of the present invention is not limited to the implementable forms by the embodiments described below, and includes the scope that can be easily proposed by an ordinary technician by replacing or changing the embodiments described below based on the essential technical idea of the present invention. Also, the terms used below are selected for the convenience of explanation, and therefore, when grasping the essential technical idea of the present invention, it should not be limited to the dictionary meaning, but should be appropriately interpreted in a meaning that conforms to the technical idea of the present invention.

[0025] FIG. 1 is a drawing schematically showing an apparatus for manufacturing a PET melt blown fiber web according to the present invention. Referring to FIG. 1, an apparatus 100 for manufacturing a PET melt blown fiber web according to the present invention has a configuration that is substantially the same as that of a conventional apparatus (equipment) for manufacturing a melt blown fiber web. In other words, the apparatus 100 for manufacturing a PET melt blown fiber web according to the present invention includes an extruder 10 that melt-extrudes a PET (polyethylene terephthalate) resin, a die 20 that emits PET melt blown fibers F thinned in the self-weight direction in response to the supply of the molten resin extruded by the extruder 10, a forming table 30 that is disposed below the die 20 at a distance and collects and aggregates the PET melt blown fibers F to form a PET melt blown fiber web W, and a winder 40 that winds up the PET melt blown fiber web W.

[0026] In addition, the manufacturing apparatus 100 for a PET melt blown fiber web according to the present invention further includes a two-fluid nozzle 50 that sprays fine droplets onto the PET melt blown fiber F radiated toward the forming table 30, and a blending nozzle 60 that air-blends (mixed-fibers) PET short fibers S into the PET melt blown fiber F radiated toward the forming table 30, in the same manner as a conventional manufacturing apparatus for a melt blown fiber web.

[0027] Here, since the configurations of the extruder 10, the die 20, the forming table 30, the winder 40, the two-fluid nozzle 50, and the blending nozzle 60 and their operating relationships are known techniques, detailed descriptions thereof are omitted.

[0028] On the other hand, different from a conventional manufacturing apparatus for a melt blown fiber web, the manufacturing apparatus 100 for a PET melt blown fiber web according to the present invention further includes a heat treatment machine 110 that pressurizes and heat-treats the PET melt blown fiber web W collected and aggregated on the forming table 30.

[0029] FIG. 2 is a drawing schematically showing the heat treatment machine shown in FIG. 1. Referring to FIG. 2, the heat treatment machine 110 of the manufacturing apparatus 100 for a PET melt blown fiber web according to the present invention includes a porous pressure belt 120, a hot air supply chamber 130, and a height adjustment means 140.

[0030] First, the porous pressure belt 120 pressurizes the PET melt blown fiber web W formed on the forming table 30 toward the forming table 30 side, and transfers the PET melt blown fiber web W together with the porous circulation belt 32 of the forming table 30 toward the winder 40 side. The porous pressure belt 120 is provided as a mesh-like belt and is provided in a closed loop shape with one end and the other end connected in an endless manner.

[0031] In the present invention, the perforated pressure belt 120 is not particularly limited, but may be a regular mesh belt, for example. The perforated pressure belt 120 is rotatably mounted on a carrier roller 124 rotatably mounted between a pair of belt frames 122 and a drive roller 128 of a belt drive motor 126.

[0032] At this time, the porous pressure belt 120 passing along the lower end of the belt frame 122 is installed lower than the lower end of the belt frame 122 so as to pass horizontally over carrier rollers 124 installed on both sides of the lower end of the belt frame 122. In this manner, the face of the porous pressure belt 120 passing horizontally along the lower end of the belt frame 122 presses the surface of the PET meltblown fiber web W, which is transferred to the winder 40 by the operation of the porous circulating belt 32 of the forming table 30, toward the porous circulating belt 32 of the forming table 30, and transfers the PET meltblown fiber web W toward the winder 40 together with the porous circulating belt 32.

[0033] To this end, the porous pressure belt 120 is circulated and rotated in the transport direction of the PET meltblown fiber web W by the operation of a belt drive motor 126, which circulates and rotates the porous pressure belt 120 at the same speed as the transport speed of the porous circulating belt 32 of the forming table 30, preferably at a speed of 1 to 10 m / min. The face of the porous pressure belt 120, which passes horizontally along the lower end side of the belt frame 122, has a pressure position that presses the PET meltblown fiber web W adjusted by the operation of a height adjustment means 140, thereby allowing the PET meltblown fiber web W to be manufactured in various thicknesses.

[0034] The hot air supply chamber 130 provides high-temperature hot air to the PET melt blown fiber web W so that the PET melt blown fiber web W pressurized and transferred by the porous pressure belt 120 is crystallized. The hot air supply chamber 130 is installed between a pair of belt frames 122 so as not to interfere with the circulating and rotating porous pressure belt 120, and is connected to a hot air duct (not shown) installed outside the heat treatment machine 110. At this time, the inside of the hot air supply chamber 130 is filled with hot air blown from the hot air duct. And, at the lower part of the hot air supply chamber 130, a large number of hot air injection nozzles 132 for injecting the hot air inside the hot air supply chamber 130 toward the PET melt blown fiber web W side are formed in a large number of rows and columns.

[0035] The hot air supply chamber 130 installed in this way injects hot air at 80 to 200 °C at a speed of 1 to 10 m 3 / min toward the PET melt blown fiber web W side through a large number of hot air injection nozzles 132. However, since the PET melt blown fiber web W is pressurized by the porous pressure belt 120, the hot air injected through the large number of hot air injection nozzles 132 can be transmitted to the front and back surfaces of the PET melt blown fiber web W at a uniform temperature, whereby the PET melt blown fiber web W is uniformly crystallized (heat treated).

[0036] The height adjusting means 140 adjusts the height of the porous pressure belt 120 that pressurizes the PET melt blown fiber web W to manufacture the PET melt blown fiber web W in various thicknesses. The height adjusting means 140 is installed on one or more height adjusting frames 142 fixedly installed at a distance above the porous pressure belt 120. FIG. 2 shows a state in which two height adjusting means 140 are installed on the height adjusting frame 142. The height adjusting means 140 includes a height adjusting servo motor 146 and a lifting bar 150 that interlocks with the height adjusting servo motor 146 to move the porous pressure belt 120 up and down.

[0037] The height adjustment servo motor 146 is installed in a gear box 144 installed on the upper surface of the height adjustment frame 142 as shown in the figure. At this time, a pinion gear 148 that meshes with the lifting bar 150 is installed on an output shaft (not shown) that rotates due to the operation of the height adjustment servo motor 146 through the gear box 144.

[0038] The lifting bar 150 is provided in the shape of a vertically extended bar and is installed in the gear box 144 so as to be able to move up and down. At this time, the lower end of the lifting bar 150 penetrates the height adjustment frame 142, and the lower end of the lifting bar 150 that penetrates the height adjustment frame 142 is connected to the outer surface of the belt frame 122 so as not to interfere with the perforated pressure belt 120. And a rack gear 152 that meshes with the pinion gear 148 is formed along the length direction of the lifting bar 150 on the lifting bar 150.

[0039] That is, when the height adjustment servo motor 146 rotates the output shaft to one side or the other side, the pinion gear 148 also rotates to one side or the other side along the output shaft. When the pinion gear 148 rotates to one side or the other side, the lifting bar 150 on which the rack gear 152 that meshes with the pinion gear 148 is formed moves up and down. As a result, the belt frame 122 and the perforated pressure belt 120 are adjusted in height while moving up and down along the lifting bar 150.

[0040] Preferably, the height adjustment means 140 enables the perforated pressure belt 120 to press and transfer the PET melt blown fiber web W so that the distance between the perforated circulation belt 32 of the forming table 30 and the perforated pressure belt 120 is adjusted within a range of 1 to 150 mm.

[0041] The following describes a method for manufacturing a PET melt blown fiber web using an apparatus for manufacturing a PET melt blown fiber web. Among the attached drawings, FIGS. 3 and 4 are flowcharts schematically showing the method for manufacturing a PET melt blown fiber web according to the present invention. The method for manufacturing a PET melt blown fiber web according to the present invention includes a radiation step (S10) of PET melt blown fibers, a forming step (S20) of a PET melt blown fiber web, and a pressure heat treatment step (S30) of the PET melt blown fiber web.

[0042] Radiation step (S10) of PET melt blown fibers The radiation step (S10) of PET melt blown fibers is a step (S10) of melting and radiating a PET (polyethylene terephthalate) polymer resin by a melt blown method to form PET melt blown fibers F.

[0043] The PET melt blown fibers F formed in the radiation step (S10) of PET melt blown fibers are vertically melt radiated toward the porous circulating belt 32 side through a die 20 facing the porous circulating belt 32 of the forming table 30 in a direction perpendicular thereto. Here, the forming table 30 manufactures a PET melt blown fiber web W by collecting and aggregating the PET melt blown fibers F in the forming step (S20) of the PET melt blown fiber web to be performed later.

[0044] On the other hand, when explaining the radiation step (S10) of PET melt blown fibers, the radiation step (S10) of PET melt blown fibers includes a charging step (S10-1) of PET raw materials, an extrusion step (S10-2) of PET raw materials, and a radiation step (S10-3) of PET raw materials. The charging step (S10-1) of PET raw materials is a step (S10-1) of charging the prepared PET raw materials into a dry hopper (not shown) connected to an extruder 10. In the charging step (S10-1) of PET raw materials, the PET raw materials can be charged into the dry hopper through a normal spring conveyor.

[0045] Then, the PET raw material loaded into the dry hopper is transferred to the extruder 10 installed on the lower side of the dry hopper. In the process of being transferred from the dry hopper to the extruder 10 in this way, the PET raw material can be dried by hot air so as to have a moisture content of about 0.01 - 1.0%. The extrusion stage (S10-2) of the PET raw material is a stage (S,10-2) in which the PET raw material is melted while being transferred receiving the supply of the PET raw material from the dry hopper, and the melted PET raw material is extruded. In the extrusion stage (S10-2) of the PET raw material, the PET raw material can be extruded at a speed of 1,250 g / min while maintaining a temperature of 280 - 300°C.

[0046] Here, when the PET raw material is extruded at a temperature lower than 280°C, not only does the fluidity decrease and a load is applied, but also there is a problem that the molecular weight increases, and the physical properties may change. When the PET raw material is extruded at a temperature exceeding 300°C, a decrease in molecular weight may occur due to thermal decomposition, and there may be a problem that the physical properties deteriorate and yellowing occurs.

[0047] Also, the extrusion speed of the PET raw material can be set differently depending on the melting temperature. However, if the extrusion speed of the PET raw material is too slow, the residence time in the extruder becomes long and the molecular weight decreases due to thermal decomposition. If the extrusion speed is too fast, there may be an unmelted phenomenon. Therefore, the extrusion speed of the PET raw material is preferably 1,250 g / min. And the melted PET raw material extruded by the extruder can be supplied to the radiation stage (S10-3) of the PET raw material through a normal screen changer (not shown) and a gear pump (not shown).

[0048] The spraying stage (S10-3) of the PET raw material is a stage (S10-3) in which the melted PET raw material supplied in the extrusion stage (S10-2) is sprayed in the form of ultrafine fibers, PET melt blown fibers, using a high-temperature and high-pressure gas. The melted PET raw material supplied to the spraying stage (S10-3) of the PET raw material flows in the self-weight direction through the die 20 and through the spraying nozzle installed at the lower part of the die 20, and the melted PET raw material flowing through the spraying nozzle can be sprayed in the form of PET melt blown fibers F that are elongated in the self-weight direction and reduced in diameter by the high-temperature and high-pressure gas sprayed on the side surface of the spraying nozzle.

[0049] Here, the high-temperature and high-pressure gas may be at 310~330 °C and may be sprayed at a speed of 25~60 m 3 / min, but if the temperature of the high-temperature and high-pressure gas is less than 310 °C, the PET melt blown fibers F sprayed will cool immediately and become hard fibers instead of soft fibers, and if the temperature of the high-temperature and high-pressure gas exceeds 330 °C, thermal decomposition will occur and the fibers will turn yellow.

[0050] Preferably, in the spraying stage (S10) of the PET melt blown fibers, the PET melt blown fibers F are sprayed to have a diameter of 2~10 μm, but if the diameter of the PET melt blown fibers F is less than 2 μm, the workability is poor and it is difficult to form stable process conditions, and if the diameter of the PET melt blown fibers F exceeds 10 μm, the sound absorption performance will decrease.

[0051] On the other hand, although not shown in the spraying stage (S10) of the PET melt blown fibers, a PET short fiber air blending stage for blending PET short fibers S may be selectively added. The PET short fiber air blending stage is for imparting bulkiness to the produced PET melt blown fiber web W, and the PET short fibers S can be air blended (mixed) with the PET melt blown fibers F sprayed toward the forming table 30 through the blending nozzle 60.

[0052] Here, the PET staple fiber S has a diameter of 15 to 40 μm. However, when the diameter of the PET staple fiber S is 15 μm, it is difficult to impart bulkiness to the produced PET melt-blown fiber web W. When the diameter of the PET staple fiber S exceeds 40 μm, although the bulkiness is improved, the cotton density of the produced PET melt-blown fiber web W is inferior and the sound absorption performance is reduced.

[0053] As an example, for improving the sound absorption performance in the low-frequency (1,000 Hz or less) range band, the PET melt-blown fiber F and the PET staple fiber S are mixed at a ratio of 3:7. For improving the sound absorption performance in the middle and high-frequency (1,000 Hz or more) range band, the PET melt-blown fiber F and the PET staple fiber S are mixed at a ratio of 7:3. That is, the mixing ratio of the PET melt-blown fiber F and the PET staple fiber S may be variable depending on the destination of use of the produced PET melt-blown fiber web. Generally, the PET melt-blown fiber F and the PET staple fiber S are mixed at a ratio of 5:5.

[0054] Forming stage (S20) of the PET melt-blown fiber web The forming stage (S20) of the PET melt-blown fiber web is a stage (S20) of collecting and aggregating the PET melt-blown fiber F that adheres to the porous circulating belt 32 of the forming table 30 to form the PET melt-blown fiber web W.

[0055] In the forming stage (S20) of the PET melt-blown fiber web, the PET melt-blown fiber F is collected on the porous circulating belt 32 that is circulated and transferred and transferred along the porous circulating belt 32. The PET melt-blown fiber F transferred along the porous circulating belt 32 is combined by the normal suction means provided on the forming table 30 to form the PET melt-blown fiber web W.

[0056] Here, the forming table 32 may be disposed 10 to 100 cm away from the emitting nozzle for melting and emitting the PET meltblown fiber F, and the perforated circulation belt 32 may be moved at a speed of 1 to 10 m / min, so that the perforated circulation belt 32 has a melting point of 100 to 700 g / m. 2 However, if the distance between the forming table 32 and the radiating nozzle and the transport speed of the perforated circulating belt 32 are less than or exceed the critical values, the weight of the PET meltblown fiber web W will be 100 to 700 g / m. 2 Therefore, it becomes impossible to form a PET meltblown fiber web W having a weight of 1000 kJ / cm2 or less.

[0057] For example, in the step of forming the PET meltblown fiber web (S20), if the transport speed of the perforated circulating belt 32 is set at 5 m / min, the fiber web will have a density of 400 g / m 2 A PET meltblown fiber web W having a weight of 10 ...

[0058] Pressurized heat treatment step (S30) of PET meltblown fiber web The pressurized heat treatment step (S30) of the PET meltblown fiber web is a step (S30) of crystallizing the PET meltblown fiber web W by applying high-temperature hot air while applying pressure to the PET meltblown fiber web W so as not to interfere with the transport of the PET meltblown fiber web W formed in the preceding PET meltblown fiber web formation step (S20).

[0059] In the pressurized heat treatment step (S30) of the PET meltblown fiber web, the PET meltblown fiber web (W) formed on the forming table (30) is pressed toward the porous circulation belt (32) of the forming table (30) by the porous pressure belt (120) of the heat treatment device (110), and the PET meltblown fiber web (W) pressed by the porous pressure belt (120) is crystallized by high-temperature hot air sprayed through the hot air spray nozzles (132) formed in the hot air supply chamber (130) of the heat treatment device (110).

[0060] At this time, the porous pressure belt 120 rotates at the same speed of 1 to 10 m / min as the transport speed of the porous circulation belt 32, and circulates along the transport direction of the PET meltblown fiber web W. The hot air injection nozzles 132 then blow high-temperature hot air at 80 to 200°C at a speed of 1 to 10 m / min. 3 The hot air can be sprayed at a speed of 6 m / min. 3 It can be injected at a rate of / min.

[0061] Here, if the high-temperature hot air is less than 80°C, crystallization of the amorphous region does not occur even if stabilization heat treatment is carried out at a temperature lower than the PET glass transition temperature and crystallization temperature, and shrinkage occurs at a temperature of 120°C or higher. If the high-temperature hot air exceeds 200°C, shrinkage occurs severely, and the produced PET meltblown fiber web becomes hard and yellowing may occur.

[0062] In addition, the high-temperature hot air is sprayed at a speed of 1 m 3 If the speed is less than 10m / min, the diameter of the produced PET meltblown fiber web will be too large and the fiber will not be formed. 3When it exceeds / min, not only does the diameter of the produced PET melt blown fiber web become thinner, but it also scatters without being collected on the forming table 30. Then, in the pressure heat treatment stage (S30) of the PET melt blown fiber web, the porous pressure belt 120 forms a gap of 1 to 150 mm with the porous circulation belt 32 of the forming table 30 by the height adjusting means 140 of the heat treatment machine 110 to pressure-transfer the PET melt blown fiber web W. As a result, the PET melt blown fiber web W can be manufactured to have various thicknesses corresponding to the gap between the porous pressure belt 120 and the porous circulation belt 32.

[0063] On the other hand, a non-woven fabric (not shown) or the like can be heat-pressed onto the front and back surfaces of the PET melt blown fiber web W that has undergone the pressure heat treatment stage (S30). According to the present invention formed in this way, since the PET melt blown fiber web W is heat-treated while being pressurized, the PET melt blown fiber web W can be crystallized at a uniform and high speed, and the productivity of the PET melt blown fiber web W can be improved by shortening such heat treatment time.

[0064] According to the present invention, since the PET melt blown fiber web W is heat-treated while being pressurized, it is possible to manufacture a PET melt blown fiber web W having a uniform thickness. According to the present invention, since the pressurizing height of the PET melt blown fiber web W can be adjusted, it is possible to manufacture a PET melt blown fiber web W having various thicknesses.

Explanation of Reference Numerals

[0065] 10 Extruder 20 Die 30 Forming Table 32 Porous Circulation Belt 40 Winders 50 Two-Fluid Nozzle 60 Blending Nozzle 100 Manufacturing Apparatus for PET Melt Blown Fiber Web 110 Heat treatment machine 120 Porous pressure belt 122 Belt frame 124 Carrier roller 126 Belt drive motor 128 Drive roller 130 Hot air supply chamber 132 Hot air injection nozzle 140 Height adjustment means 142 Height adjustment frame 144 Gear box 146 Height adjustment servo motor 148 Pinion gear 150 Lifting bar 152 Rack gear

Claims

1. An extruder for melt-extruding PET resin, a die that receives the supply of the molten resin extruded by the extruder and emits PET melt blown fibers thinned in the self-weight direction, and is installed at a distance below the die, and the PET melt blown fibers are collected and agglomerated to form a PET melt blown fiber web. A forming table, a winder for winding the PET melt blown fiber web, and a blending nozzle for blending PET short fibers with the PET melt blown fibers radiated toward the forming table side, in a manufacturing apparatus for a PET melt blown fiber web, The manufacturing apparatus for the PET melt blown fiber web is, Including a heat treatment machine that pressurizes and heat-treats the PET melt blown fiber web formed on the forming table, The heat treatment machine is, Provided with a mesh-like belt, rotatably installed between a pair of belt frames, and rotatably installed on a carrier roller and a drive roller of a belt drive motor, and pressurizes the PET melt blown fiber web toward the forming table side, and together with the perforated circulation belt of the forming table, the PET melt blown fiber web is transferred toward the winder side. A perforated pressure belt, A hot air supply chamber that provides hot air at a high temperature to the PET melt blown fiber web so that the PET melt blown fiber web pressurized and transferred by the perforated pressure belt is crystallized, Including height adjusting means for adjusting the height of the perforated pressure belt that pressurizes the PET melt blown fiber web, The perforated pressure belt passing through the lower end side of the belt frame is installed so as to pass horizontally through the carrier rollers installed on both sides of the lower end of the belt frame, which is lower than the lower end of the belt frame, and the surface of the PET melt blown fiber web is pressurized toward the perforated circulation belt side, and together with the perforated circulation belt, the PET melt blown fiber web is transferred toward the winder side, The height adjustment means is installed on one or more height adjustment frames fixedly installed at a distance above the porous pressure belt, and includes a height adjustment servo motor installed in a gear box installed on the upper surface of the height adjustment frame, and a lifting bar that moves the porous pressure belt up and down in conjunction with the height adjustment servo motor. A pinion gear is installed on the output shaft that rotates by the operation of the height adjustment servo motor. The lifting bar is installed in the gear box so as to be able to move up and down. The lower end of the lifting bar penetrates the height adjustment frame and is connected to the outer surface of the belt frame. The manufacturing apparatus for a PET melt blown fiber web is characterized in that a rack gear meshing with the pinion gear is formed along the length direction of the lifting bar.

2. The hot air supply chamber is installed between the belt frames so as not to interfere with the porous pressure belt, and is filled with hot air sent from a hot air duct installed outside the heat treatment machine. The manufacturing apparatus for a PET melt blown fiber web according to claim 1, wherein a plurality of hot air injection nozzles for injecting hot air toward the PET melt blown fiber web are formed at the lower part of the hot air supply chamber.

3. In a method for manufacturing a PET melt blown fiber web using the manufacturing apparatus for a PET melt blown fiber web according to claim 1, a PET melt blown fiber spraying step (S10) of melting and spraying a PET raw material by a melt blown method to form the PET melt blown fiber, a PET melt blown fiber web forming step (S20) of collecting and aggregating the PET melt blown fiber deposited on the porous circulation belt to form the PET melt blown fiber web, and a pressurized heat treatment step (S30) of providing hot air at a high temperature while pressurizing the PET melt blown fiber web to crystallize the PET melt blown fiber web.

4. In the PET melt blown fiber spraying step (S10), The PET melt blown fiber is emitted at a temperature of 270 to 330°C at a speed of 25 to 60 m ３ / min and is emitted so as to have a diameter of 2 to 10 μm. The method for producing a PET melt blown fiber web according to claim 3, characterized in that.

5. In the PET melt blown fiber spraying step (S10), PET staple fibers having a diameter of 15 to 40 μm are mixed with the sprayed PET melt blown fiber. In order to improve the sound absorption performance in the low-frequency band, the PET short fibers and the PET melt-blown fibers are mixed at a weight ratio of 3:

7. In the middle and high-frequency bands, in order to improve the sound absorption performance, the PET short fibers and the PET melt-blown fibers are mixed at a weight ratio of 7:

3. The method for manufacturing a PET melt-blown fiber web according to claim 3, characterized in that.

6. In the forming step (S20) of the PET melt-blown fiber web, The porous circulating belt is transported at a speed of 1 to 10 m / min. The porous circulating belt has the PET melt blown fiber web having a weight of 100 to 700 g / m ２ The method for producing a PET melt blown fiber web according to claim 3, characterized in that the PET melt blown fiber web having a weight of ２ is formed on the porous circulating belt.

7. In the pressurized heat treatment step (S30) of the PET melt-blown fiber web, The porous pressurized belt rotates in a cycle at a speed of 1 to 10 m / min and rotates in a cycle along the transport direction of the PET melt-blown fiber web. The hot air supply chamber injects hot air at a temperature of 80 to 200°C through a hot air injection nozzle at a rate of 1 to 10 m ３ / min, and the method for manufacturing a PET melt blown fiber web according to claim 3 is characterized by this.

8. In the pressurized heat treatment step (S30) of the PET melt-blown fiber web, The porous pressurized belt forms a gap of 1 to 150 mm from the porous circulating belt, and the method for manufacturing a PET melt-blown fiber web according to claim 7, characterized in that the PET melt-blown fiber web is pressurized and transported.

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