KR102165393B1 - Apparatus and method for manufacturing spunbonded non-woven fabric having distribution of uniform density and similar tensile strength in longitudinal direction and transverse direction in a large quantity - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a long-fiber nonwoven fabric in large quantities, comprising a plurality of nozzles each connected to a plurality of drawing pipes to discharge the filaments drawn through the plurality of drawing pipes, a plurality of drawing pipes, and spinning The amount of external air introduced by adjusting the size of the drawing part for drawing the filaments through the drawing pipe, the conveyor collecting the filaments and transferring them in the first direction, and the suction port formed at one side of the plurality of drawing pipes It may include a stretched pipe cover for.

Description

Apparatus and method for manufacturing spunbonded non-woven fabric having distribution of uniform density and similar tensile strength in a mass distribution of uniform density and similar tensile strength in longitudinal and transverse directions longitudinal direction and transverse direction in a large quantity}

The present invention relates to an apparatus and method for producing a large amount of long-fiber nonwoven fabric having a uniform density distribution and similar tensile strength in the longitudinal and transverse directions, and more specifically, the tensile strength ratio in the longitudinal and transverse directions. It relates to an apparatus and method for producing a long fiber nonwoven fabric having an excellent density distribution by suppressing the rise.

The manufacturing technology of long fiber nonwoven fabrics has steadily developed since the introduction of commercial manufacturing technology. Industrial large-scale manufacturing methods, which have begun to be developed by grafting long-fiber filaments or filament fibers spinning technology, are largely classified into two types of manufacturing methods: Dokan and Curtain processes. General information related to this is described in "Introduction to Nonwoven Technology (by Subhash K. Batra, 2012, DEStech Publification Inc. North Carolina State Univ. U.S.A.)" P213 to P220.

The Dokan process or Dokan method is a device that stretches fibers at a high speed to increase the strength of a long fiber filament to be produced, and uses a device similar to a circular pipe using compressed air. In such a method, the fiber can be drawn at a high speed of 5,000 m/min or more using a relatively simple device, and thus, a high-strength fiber can be produced relatively simply. However, since fibers that are drawn at high speed are introduced into the Dokan pipe and become a fiber bundle, in order to be used as a nonwoven fabric, the bundled fibers must be separated from each other and spread uniformly.

Curtain Process The curtain method uses a fiber drawing device in the form of a long slit in a relatively complex and large rectangle. Although it is advantageous to mass-produce long-fiber nonwoven fabrics, it may be difficult to uniformly supply compressed air for stretching because a single stretching device is used over a wide width direction, and accordingly, the velocity distribution of the filaments may be locally different. In addition, the weight distribution of the nonwoven fabric tends to be poor due to the entanglement of the stretched filaments.

Therefore, the long-fiber nonwoven fabric manufacturing methods, whether in the Dokan process or the curtain process, are devised for spreading the stretched filaments evenly without clumping together. In addition, various methods and techniques have been devised so that the separated and diffused filaments are regularly rearranged in the longitudinal and transverse directions of the nonwoven fabric to have an equivalent tensile strength ratio. The uniformity of the weight (density) distribution and tensile strength of the nonwoven fabric described above are common characteristics required for all nonwoven fabrics, and many techniques by several prior inventors to devise a method for manufacturing a long fiber nonwoven fabric that satisfies all requirements. Have been introduced.

On the other hand, there is also a method of manufacturing a nonwoven fabric by stretching filaments using a split-type curtain-type stretching device, and then dispersing and diffusing the stretched fibers using a Coanda device.

Looking at this in detail, in the above patent, the technology of the Dokan and the curtain process was combined, (1) a curtain-type stretching device of separate multiple types was introduced, and (2) a plurality of separated stretching devices were used in the direction of nonwoven fabric manufacturing. (3) A filament diffusion device such as Coanda was developed and placed at the bottom of the stretching device to separate the filaments, and at the same time, the fibers were arranged in the transverse direction to reduce the weight distribution of the nonwoven fabric. It provides a method to manufacture products with a uniform tensile strength ratio.

However, the above technologies are basically a method of diffusing the air flow because they use the Coanda device disposed at the bottom of the stretching device, and the stretched filaments flow through the air diffused by the Coanda device. Follows the direction and scatters. Therefore, it is difficult to manufacture a nonwoven fabric having a uniform density distribution because the filaments are entangled or entangled by airflow during diffusion. This phenomenon tends to worsen as the number of filaments increases or the denier of the filaments decreases. In other words, fineness filaments of 3 denier or less move quickly in the air flow, and many filaments are inevitably introduced into the curtain-type stretching device to increase productivity. The degree of freedom of the filaments (Degree of Freedom ≒ the distance between the filaments) is further lowered by this complex action, and the entanglement and entanglement between the fibers are further deteriorated, making it difficult to actually manufacture fineness products. In addition, even in the case of manufacturing a medium fineness product of 5 denier or more and a high fineness product of 8 denier or more, separation and diffusion between fibers are not sufficient when manufacturing a low-weight product with a non-woven fabric weight of 50gr/㎡ or more, so that the fibers are twisted and entangled. It is a situation in which defects such as (entanglement) are frequently observed. Therefore, the product according to the technology is practically used commercially limited to 60gr/m2 or more heavy weight products composed of thick filaments of 8 denier or more.

Coanda technology and equipment applied to the curtain process are shown in EP0224435 and US5045271. The basic principle and structure of the devices are similar to those provided by the German and US patents.

In order to improve this phenomenon, a technique shown in US Patent Publication No. US20030030175 may be considered. This technology provides air injection technology using compressed air instead of the Coanda device disposed at the bottom of the separate stretching device. That is, to propose a method of dispersing and dispersing the filaments by alternately spraying compressed air in a direction perpendicular to the direction of direct downward travel of the stretched filament bundle.

However, this method is a phenomenon in which the filaments are entangled and twisted by turbulence generated when a large amount of high-pressure air streams continuously ejected from the drawing device at high speed and the high-pressure air streams intermittently sprayed in the vertical direction collide with each other. Due to this frequent occurrence, it is inevitable to manufacture a product having an uneven weight distribution. Basically, whether it is the Coanda method or the high-pressure air injection method, there is no change in principle that adjusts the flow of air to give dispersion and diffusion of the filaments. As such, it is obvious that the methods cannot separate and diffuse each filament in two uniformly. Therefore, there is a clear limitation in manufacturing a nonwoven fabric having a uniform density distribution, that is, a nonwoven fabric having a uniform weight distribution.

In order to overcome these technical limitations, an example of a technique for providing a method of effectively separating continuous filaments moving at high speed is shown in US3338992. This technology is a method of attaching high-pressure direct current static electricity to the surfaces of fast moving continuous filaments through friction or corona discharge. As is well known, when high-pressure static electricity is attached to the surface of a thermoplastic synthetic fiber, a force is generated that pushes the filaments together by repulsive force, resulting in the effect of natural separation without twisting or entanglement between the fibers. appear. The method of applying high-voltage direct current static electricity to the surfaces of filaments running at high speed is the Dokan method, but the devices are different according to the curtain method, but the basic principle is the same.

That is, direct current static electricity of 10 KV to 30 KV is generated on the surface of the filament that has been stretched to attach electrostatic ions in a corona state to the fiber surface. In US5225018, the technique and device for generating and attaching direct current static electricity according to the Dokan method are well shown. Explaining this technology, (1) by colliding the filaments drawn at high speed through a pipe against an inclined reflector, it makes the flat state so that static electricity can be evenly attached to the surface of each fiber. (2) In the high-voltage direct current static electricity applying device placed at the bottom of the inclined reflector, the direct current static electricity in the corona state moves and adheres to the surface of the fiber, and (3) the fibers repel each other by the electrostatic force attached to the fiber surface. , Separate and spread.

The electrostatic filament dispersion technique in the curtain method is well disclosed in US5225018. That is, when a rectangular DC static electricity application device is disposed at the bottom of the curtain stretching device where the stretched filaments are discharged downward, and corona ions are attached to the fiber surface, they are separated from each other by the electrostatic repulsive force between the fibers, Spreads.

As described above, the method of dispersing fibers by electrostatic force has an advantage that microscopic defects such as twist and entanglement do not appear because the separation between the fibers works reliably. Therefore, it is an advantageous manufacturing method because it can improve the occurrence of microscopic defects due to filament twist or agglomeration that may appear on the product when manufacturing a low-weight nonwoven fabric of less than 60gr/m2 or, in particular, an ultra-low weight nonwoven fabric of less than 20gr/m2. . In addition, it is widely used because the performance does not appear large depending on the thickness of the fiber.

However, such an electrostatic separation technique does not provide a method of uniformly adjusting the longitudinal and transverse tensile strength of the final nonwoven fabric by forcibly moving the filament fibers in the weft direction. That is, since the repulsive force by the electrostatic force is weak, the separation force is sufficiently provided at the level of the filaments, but a large force at the level of moving a further distance in the transverse direction cannot be exerted. Therefore, the use of such an electrostatic imparting technique is useful in manufacturing a nonwoven fabric having an excellent low weight density distribution, but it is insufficient to manufacture a long fiber nonwoven fabric of excellent quality having the same ratio of tensile strength in the longitudinal and transverse directions.

A prior art for providing a method capable of improving the strength ratio in the longitudinal direction and the transverse direction in the Dokan method is disclosed in JP3106681. This technology provides a method of arranging the filaments in the transverse direction as much as possible by adjusting the spacing between the Docan jet pipes arranged in the vertical (transverse) direction with respect to the longitudinal (longitudinal) direction of nonwoven fabric production. In other words, it is a method of increasing the tensile strength in the transverse direction and suppressing the improvement in the tensile strength in the longitudinal direction to uniformly maintain the tensile strength in the longitudinal and transverse directions of the nonwoven fabric.

The method for improving the weight distribution of the nonwoven fabric of JP3106681 is shown in JP2988052 and JP3269542. All of the above JP3106681, JP2988052, and JP3269542 are methods of separating fibers using static electricity, and are methods using forced frictional static electricity generation without using a high-voltage direct current static electricity generator. That is, the filaments discharged at high speed from the stretching pipe of the Dokan method are rubbed against the collision plate disposed below, and the static electricity generated at this time is used to prevent twisting and entanglement between the fibers, while dispersing them. This is a method of continuously manufacturing a nonwoven fabric having a uniform density distribution.

These methods can be usefully used because simpler devices can be used than methods of directly generating DC high voltage and charging the surfaces of the filaments. However, since (1) lead (Pb) is used as the main component as a friction material, a trace amount of lead (Pb) fine powders that rub against fibers and abrasion at this time are contained in a small amount in the nonwoven fabric, which is a product, and may be harmful to the human body and the environment. )It is a method that does not directly apply high voltage to the fiber by generating a corona discharge using a direct current high voltage generator (HVG), so many fibers cannot be effectively charged due to insufficient electrostatic charge. Therefore, when a large number of fibers are rubbed and charged, the friction between the friction body and the fibers cannot be uniformly maintained.Therefore, due to the non-uniformity of the charging repulsion force and the lack of overall frictional force, sufficient charge amount cannot be secured, so that sufficient separation between fibers is not achieved. May not.

In other words, when the number of fiber filaments is increased to improve productivity, non-uniformity of electrostatic charge and insufficient charge amount are bound to occur. In addition, since lead (Pb) is the main component as a friction material, it is difficult to access the market with high growth and high profitability and demand for hygiene, medical use, and filters.

As a result of detailed investigation and analysis of the conventional techniques as described above, no excellent technique was found that satisfies both the weight distribution and the longitudinal and transverse directions of the long-fiber nonwoven fabric. In particular, there is no production technology for a long fiber nonwoven fabric having an excellent weight distribution and strength ratio in the longitudinal and transverse directions even for low weight products of 60gr/m2 or less. In addition, a new plan that considers both productivity, human-friendly and environmental aspects must be considered.

Korean Patent Registration No. 10-0680373

The present invention is to solve the problems of the prior art as described above, and an object thereof is to provide an excellent technology that satisfies both the weight distribution of the long fiber nonwoven fabric and the strength ratio in the longitudinal and transverse directions.

In addition, there is another object to provide a manufacturing technology of a long fiber nonwoven fabric having excellent weight distribution and tensile strength in the longitudinal and transverse directions even for low weight products of 60gr/m2 or less.

In addition, there is another object to increase productivity and provide a human-friendly long fiber nonwoven fabric.

An apparatus for manufacturing a large amount of a long-fiber nonwoven fabric according to the present invention for achieving the above object comprises a plurality of drawing pipes, and a drawing unit for drawing the spun filaments through the plurality of drawing pipes; A plurality of nozzles respectively connected to the plurality of stretching pipes to discharge the stretched filaments; A conveyor collecting the filaments from the plurality of nozzles and transferring them in a first direction; And a stretch pipe cover for adjusting the amount of external air introduced by adjusting the size of the suction port formed on one side of the plurality of stretch pipes.

Here, a guide member for guiding the external air is provided at a lower portion of the position at which the suction port is formed inside the plurality of elongating pipes.

In addition, the guide member reduces the inner diameters of the plurality of stretched pipes by the length of the hem, and the inner diameters of the plurality of stretched pipes reduced by the length of the hem of the guide member are from one fifth to one third. It is characterized by being between.

In addition, it is provided at the top or bottom of the plurality of nozzles, by introducing compressed air into the plurality of stretching pipes, and attaching ions to the surfaces of the filaments to charge the filaments, thereby separating and diffusing the filaments. Including; wherein the suction port is located at a distance between 2 and 6 times the inner diameter of the plurality of stretch pipes from the upper end of the corona charging unit, and the area of the suction port is an inner area of the plurality of stretch pipes It is characterized in that it is formed between 0.2 times and 1.0 times.

On the other hand, the apparatus for mass-producing a long-fiber nonwoven fabric according to the present invention for achieving the another object includes a plurality of nozzles each connected to a plurality of drawing pipes to discharge the filaments drawn through the plurality of drawing pipes; A conveyor collecting and transferring the filaments from the plurality of nozzles; And a plurality of charging units corresponding to each of the plurality of nozzles, formed by being spaced apart from each of the plurality of nozzles by a predetermined distance, blocking the flow of air applied to the filaments, and performing additional charging on the filaments. Airflow interference prevention plate; may include.

In addition, one of the plurality of charged airflow interference prevention plates includes at least one metal surface and is charged as a voltage is applied, and at least a portion of the charged airflow interference prevention plate is disposed around the charged airflow interference prevention plate. An insulated prevention plate cover is provided, and the metal surface is provided to face the plurality of nozzles so that the filaments discharged from one of the plurality of nozzles directly contact, and the prevention plate cover is provided in the charged airflow interference prevention plate. It is characterized in that only a portion of the metal surface facing the plurality of nozzles is exposed to the outside.

In addition, the spaced apart distance between the charged airflow interference prevention plate and the plurality of nozzles is characterized in that between 0.5 to 2 times the inner diameter of the plurality of stretching pipes.

In addition, the plurality of nozzles are arranged in a non-zero inclination with respect to a direction perpendicular to the first direction.

On the other hand, the method of manufacturing a large amount of a long fiber nonwoven fabric according to the present invention for achieving the above object comprises the steps of: a spinning block melts the thermoplastic synthetic fiber at a high temperature and spun into a filament bundle of long fibers; Stretching the spun filaments through a plurality of stretching pipes; Discharging the filaments by a plurality of nozzles connected to each of the plurality of stretching pipes; Collecting and arranging the filaments from the plurality of nozzles to a conveyor; And a stretching pipe cover configured to control the amount of external air introduced by adjusting a size of an inlet formed at one side of the plurality of stretching pipes and connecting the arranged filaments by transferring the arranged filaments. .

On the other hand, the method of manufacturing a large amount of a long fiber nonwoven fabric according to the present invention for achieving the above another object comprises the steps of: a spinning block melts the thermoplastic synthetic fiber at a high temperature and spun into a filament bundle of long fibers; Stretching the spun filaments through a plurality of stretching pipes; Discharging the filaments by a plurality of nozzles connected to each of the plurality of stretching pipes; Blocking the flow of air applied to the filaments by a charging airflow interference prevention plate, and performing additional charging on the filaments; Collecting and arranging the filaments by a conveyor; And transferring and bonding the arranged filaments.

The apparatus and method for manufacturing a long fiber nonwoven fabric according to the present invention has the following effects.

First, based on the Dokan method, since the jet pipe for filament drawing is arranged diagonally with respect to the direction perpendicular to the nonwoven fabric manufacturing process, fiber movement in the transverse direction can be effectively promoted and manufactured with the same manufacturing width. It is advantageous in improving productivity and weight distribution because more pipes can be arranged in a dense manner compared to the conventional technology.

Second, by providing a corona generating device at the bottom of the pipe, it is possible not only to solve problems such as twisting and entanglement between fibers, but also to efficiently disperse the fibers, so that the productivity is excellent.

1 is a schematic diagram of an apparatus for manufacturing a conventional long fiber nonwoven fabric.
2 is a side view schematically showing an apparatus for manufacturing a long fiber nonwoven fabric according to an embodiment of the present invention.
3 is a plan view schematically showing an apparatus for manufacturing the long fiber nonwoven fabric shown in FIG. 2.
4 is a diagram schematically showing the arrangement of the radiation block shown in FIG. 3.
5 is an enlarged schematic view of a structure for charging the filaments drawn and discharged in the apparatus for manufacturing the long-fiber nonwoven fabric shown in FIG. 2.
6 is a view schematically showing another embodiment of a structure for charging the filaments shown in FIG. 5.
7 is a view schematically showing another embodiment of the structure for charging the filaments shown in FIG.
8 is a view showing another embodiment of the apparatus for manufacturing the long-fiber nonwoven fabric shown in FIG.
9 is a view schematically showing how to adjust the size of the suction port by rotating the elongated pipe cover provided on one side of the suction port in the apparatus for manufacturing the long fiber nonwoven fabric shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, some configurations irrelevant to the gist of the invention will be omitted or compressed, but the omitted configuration is not necessarily a configuration unnecessary in the present invention, and will be combined and used by a person having ordinary knowledge in the technical field to which the present invention belongs. I can.

In the present invention, the above-described shortcomings of the prior art are complemented and the quality and defects are improved, while productivity and environmental aspects are simultaneously considered, and excellent products are provided regardless of the thickness of the fibers constituting the long-fiber nonwoven fabric and the weight of the nonwoven fabric to be manufactured. Invented a method that can be produced continuously.

The drawings have been illustrated to aid in the description of the present invention, and a detailed description of the present invention will be made using the drawings.

1 is a schematic diagram of an apparatus for manufacturing a conventional long fiber nonwoven, FIG. 2 is a side view schematically showing an apparatus for manufacturing a long fiber nonwoven according to an embodiment of the present invention, and FIG. 3 is a long fiber shown in FIG. It is a plan view schematically showing an apparatus for manufacturing a nonwoven fabric, and FIG. 4 is a view schematically showing the arrangement of the spinning block shown in FIG. 3.

As shown in Figs. 1 to 4, an apparatus for manufacturing a long fiber nonwoven fabric having a uniform density distribution and similar tensile strength in the longitudinal and transverse directions (hereinafter referred to as "an apparatus for producing a long fiber nonwoven fabric") The raw material storage and supply tank 110, extrusion unit 120, molten raw material supply and distribution unit, spinning block 130, exhaust unit 140, filament cooling unit 150, stretching unit 160, corona charging Unit 170, high voltage generator 180, nozzle 190, airflow interference prevention plate 200, conveyor 210, suction unit 220, calender roll 230, cooling roll 240, winder It may include (250).

The raw material storage and supply tank 110 is configured to store raw materials of thermoplastic synthetic fibers and supply the raw materials of thermoplastic synthetic fibers to the extrusion unit 120.

The extrusion unit 120 is provided in a horizontal form to melt the supplied raw material of the thermoplastic synthetic fiber and extrude it with the spinning block 130.

Spinning block 130 is a component for manufacturing long fibers by spinning a raw material of a thermoplastic synthetic fiber melted at a high temperature through a spinning nozzle. The spinning block 130 may be arranged in a non-zero slope with respect to a direction perpendicular to the direction in which the conveyor 210 transports the filaments. A plurality of radiation blocks 130 may be provided and may be arranged in a vertical direction of the conveyor 210, and the plurality of radiation blocks 130 may be arranged spaced apart from each other by a predetermined distance.

The exhaust unit 140 is configured to discharge gas generated when the raw material of the thermoplastic synthetic fiber is melted at high temperature.

The filament cooling unit 150 is configured to cool the filament bundle 1 made of long fibers by the spinning block 130. The filament bundle 1 manufactured through the spinning block 130 maintains a high temperature because heat is applied. At this time, since the filament bundle 1 maintained at high temperature is very fluid in shape at a high temperature, the shape of the filament bundle 1 may be changed during movement. Therefore, the filament cooling unit 150 is made of long fibers and provides cooling air to the spun filament bundle 1 to reduce the temperature, thereby maintaining the long fiber shape.

The stretching unit 160 is provided at the lower end of the spinning block 130 to stretch the spun filament bundle 1. The stretching unit 160 may include a stretching pipe 160 ′, and may be stretched at high speed using the introduced compressed air. Since the stretched filaments have high tensile strength and low heat shrinkage, they do not lose their intrinsic properties despite high tension and high temperature continuously applied in subsequent processes. After the stretching is completed, the filament is moved to the nozzle 190 through the stretching pipe 160'. The stretching unit 160 may be interlocked with the spinning block 130, and at an inclination angle in which the spinning block 130 is arranged at a non-zero inclination with respect to a direction perpendicular to the direction in which the conveyor 210 transports the filaments. Accordingly, a plurality of stretching pipes 160 ′ may be arranged at the same inclination angle. For example, if the spinning block 130 forms an inclination angle that is arranged at 30 degrees with respect to a direction perpendicular to the direction in which the conveyor 210 transports the filaments, the plurality of stretching pipes 160 ′ and the conveyor 210 The filament is to form an inclination angle that is arranged at 30 degrees with respect to a direction perpendicular to the direction of travel.

The corona charging unit 170 is provided at the top or bottom of the nozzle 190 to attach ions to the surfaces of the filaments to separate and diffuse the stretched filaments. The corona charging unit 170 is provided with a plurality of charging needles 172, and the charging needle 172 is charged by the charging electrode 171 so as to charge the filament. In addition, a plurality of holes are formed on the surface of the charging electrode 171, and compressed air is introduced from one side of the corona charging unit 170 to eject the filament through the hole formed on the surface of the charging electrode 171. In addition, the protective cover 173 may protect the charging needle 172 from the outside. In addition, the ground electrode 174 and the charging electrode 171 form a ground. For example, the corona charging unit 170 may be located near the filament moving in the stretching pipe 160 ′ when the filament drawn through the stretching pipe 160 ′ is moved to the lower end by gravity. Accordingly, the corona charging unit 170 injects ions into the filaments with the charging needle 172 so that all of the filaments have a polarity to one of the (+) or (-) electrodes. The filaments charged with one polarity generate a repulsive force to each other, and the filaments maintain an elongated state by the repulsive force so that they may be discharged from the nozzle 190 without being bundled with each other.

The high voltage generator 180 is configured to apply a voltage to the corona charging unit 170 to charge the charging needle 172 of the corona charging unit 170 to a (+) pole or a (-) pole.

The nozzles 190 are respectively connected to the lower portions of the stretching pipes 160 ′ to discharge the stretched filaments to the outside. The nozzles 190 may be arranged by forming an inclination angle with a non-zero inclination with respect to a direction perpendicular to the direction in which the conveyor 210 transports the filaments in the same manner as the connected elongated pipe 160 ′. Accordingly, the filaments discharged from the nozzle 190 may be collected by being inclined to the conveyor 210, as shown in FIG. 2, and accordingly, each filament may have different points at which the filaments are collected by the conveyor 210. I can. That is, the distance between the point at which each filament is collected from any one point vertically in the traveling direction of the conveyor 210 is different. For example, if the plurality of nozzles 190 are arranged at 30 degrees with respect to a direction perpendicular to the direction in which the conveyor 210 transports the filaments, the discharged filament is also a point at which the filaments are collected when collected from the conveyor 210 It means that a straight line formed by them is formed at 30 degrees with respect to the horizontal direction of the conveyor 210.

In an embodiment of the present invention, at least two of the collected points may be located at different distances from a region in a vertical direction from the traveling direction of the conveyor 210. For example, it may have a constant slope with respect to the vertical direction in units of two or three points.

The airflow interference prevention plate 200 is provided at a position spaced apart by a predetermined distance for each nozzle 190, and is configured to block air flow that may be applied to the filament. The airflow interference prevention plate 200 is provided in a vertical direction from the ground, and can be inclined at a predetermined angle. For example, the airflow interference prevention plate 200 may be inclined at 30 degrees from the vertical direction of the ground and the filaments discharged from the nozzle 190 may collide.

The conveyor 210 is provided under the airflow interference prevention plate 200 and the nozzle 190, collects the filaments discharged from the nozzle 190, and transfers the arranged filaments.

The suction unit 220 is configured to discharge compressed air remaining inside to the outside.

The calender roll 230 is configured to manufacture a nonwoven fabric by compressing and bonding the filaments arranged on the conveyor 210.

The cooling roll 240 is configured to cool the manufactured nonwoven fabric.

The winder 250 is configured to wind the manufactured nonwoven fabric to a predetermined length.

Hereinafter, the structure of the present invention will be described in detail together with the drawings. The manufacturing process of long fiber nonwoven fabric can be divided into three parts.

The first is a spinning process in which thermoplastic synthetic fibers are melted at high temperature to produce long fibers through a spinning nozzle, which is similar to a general long fiber filament manufacturing process.

Second, the spun thermoplastic filaments are stretched at high speed to produce high-strength fibers, and then each filaments are separated using a configuration in which the filaments are dispersed, and then the filaments are uniformly arranged on the conveyor 210. This process is also referred to as a web manufacturing process.

The third and last is a bonding process in which a web made of a plurality of filaments is bonded to give physical properties including tensile strength. Various techniques may be used in this bonding process, but in general, the calender roll 230 is frequently used among the most general-purpose devices, Thermal Bonding. Therefore, in the present invention, it will be described that the nonwoven fabric is bonded by using the calender roll 230.

Here, filament is a short term for filament fiber, and filament has the same meaning as filament fiber.

The second of these processes, the web manufacturing process, is a core process that determines the performance of nonwoven fabrics, so various technologies and devices have been developed and used.

In FIG. 3, in order to manufacture a long fiber nonwoven fabric having the same tensile strength in the longitudinal and transverse directions while the target weight distribution is uniform in the present invention, the spinning block 130, the stretching pipe and the nozzle 190 are inclined. The core method of arranging a web is shown in the dividing bias arrangement method.

In addition, a conventional arrangement method compared to the divided tilt arrangement method of the present invention can be seen in FIG.

Referring to FIG. 1, a stretching unit including a spinning block 40 arranged and installed in a direction perpendicular to the direction in which the web is manufactured, and a plurality of stretching pipes 30 installed parallel to the bottom of the spinning block 40 ( 30) and a plurality of nozzles 20 are provided, and a collision plate 10 is provided integrally and parallelly arranged while maintaining a constant distance from the plurality of nozzles 20. In this arrangement, the spacing between the nozzles 20 plays a very important role in the weight distribution of the nonwoven fabric and the development of tensile strength in the longitudinal and transverse directions.

Based on the concept as shown in FIG. 1, conventionally, a method of uniformly maintaining the tensile strength of the nonwoven fabric in the longitudinal and transverse direction has been proposed by adopting a structure in which the filaments are widely dispersed in the transverse direction by adjusting the spacing of the nozzles 20 wide.

However, this structure has a disadvantage in that the number of nozzles 20 is reduced because the spacing of the nozzles 20 is relatively wide. In other words, productivity can decline. In addition, since the distance between the nozzles 20 is wide, the tensile strength ratio is improved, but the area in which the nozzles 20 should be dispersed is also increased, so that the weight distribution may be poor.

In the present invention, as can be seen from FIG. 3, the present invention is arranged in a non-zero inclination with respect to the direction perpendicular to the direction in which the spinning block 130 proceeds, that is, the direction in which the conveyor 210 proceeds. Is to form. Here, the radiation block 130 is interlocked with the plurality of elongating pipes 160 ′ and the plurality of nozzles 190. In the present invention, each of the plurality of nozzles 190 maintains a constant distance, thereby generating the effects described in the present invention. That is, it is important to keep the horizontal interval (l ₁ ) and the vertical distance (l ₂ ) of the nozzle 190 constant. As a result, in the present invention, the inclination angle of the radiation block 130 interlocked with the plurality of nozzles 190 to maintain the horizontal distance (l ₁ ) and the vertical distance (l ₂ ) between the nozzles 190 within a certain range And, accordingly, a plurality of elongation pipes 160 ′ and a plurality of nozzles 190 are also interlocked with the radiation block 130 to be arranged in a non-zero slope with respect to a direction perpendicular to the direction in which the conveyor 210 proceeds. And the inclination angle is formed.

Therefore, in the present invention, the inclination angle of the spinning block 130 is preferably maintained at 20 degrees or more with respect to the direction perpendicular to the progression direction of the web or filament, that is, the direction of the conveyor 210. Also, it is good to keep the maximum angle below 80 degrees. More preferably, the level of 25 to 50 degrees is preferred, and the level of 30 to 45 degrees is most preferred. In the present invention, the nozzle spacing (l ₀ ) is divided into a horizontal spacing (l ₁ ) and a vertical distance (l ₂ ), and each nozzle 190 maintains a constant distance, thereby generating the effects described in the present invention.

Therefore, in the present invention, it is preferable to maintain the horizontal spacing (l ₁ ) of the nozzle 190 is 40mm or more. More preferably, it is 70 mm or more, and when it exceeds 150 mm, it is not preferable. Most preferably, the range of 70 to 120 mm is preferred.

Here, when the horizontal distance (l ₁ ) of the nozzles 190 is less than 40mm, the distance between the nozzles 190 is close, so interference occurs between the filaments due to a large amount of air flow ejected from the adjacent nozzles 190 easy. In addition, when the horizontal interval (l ₁ ) exceeds 150 mm, the nozzle interval (l ₀ ) may become farther, resulting in poor weight distribution of the nonwoven fabric. Therefore, the horizontal interval (l ₁ ) should be maintained at the distance suggested by the present invention.

In the present invention, the vertical distance (l ₂ ) is also an important variable. The vertical distance (l ₂ ) should be kept at least 30mm, and the wider it is, the less interference between adjacent nozzles 190 is, so it is preferable. However, if the spaced apart distance between the nozzles 190 increases, that is, if the inclination angle of the radiation block 130 is too large, the size of the conveyor 210 also increases more than necessary, so much effort is required to manufacture and maintain operation. . Therefore, it is desirable to keep the vertical distance (l ₂ ) within a range in which stable operation is possible without falling below a certain interval.

When the inclination angle of the spinning block 130 exceeds 60 degrees, it is possible to install more nozzles 190 when the width of the nonwoven fabric to be manufactured is constant, thereby increasing the production amount and at the same time having a more uniform density distribution and There is an advantage of being able to manufacture a nonwoven fabric having excellent tensile strength in the direction and transverse direction.

However, as described above, if the inclination angle is too large, the length of the conveyor 210 increases, so there is a difficulty in manufacturing and operation. Therefore, it is preferable to maintain the inclination angle of the radiation block 130 within the range of 25 degrees to 50 degrees in consideration of the driving environment. However, it is also possible to manufacture nonwoven fabrics by changing the angle to the level of 60° to 80° depending on the manufacturing environment.

Here, it has been described that a plurality of radiation blocks 130, a plurality of elongation pipes 160', and a plurality of nozzles 190 are arranged in a non-zero inclination from the traveling direction of the conveyor 210 to form an inclination angle. Depending on the implementation, even if the spinning block 130 is disposed at an inclination of 0 with respect to the traveling direction of the conveyor 210 as in the prior art, a plurality of stretching pipes 160 ′ and a plurality of nozzles 190 It is arranged in a non-zero slope with respect to a direction perpendicular from the traveling direction to form an inclination angle.

As described above, the present invention proposes a method capable of manufacturing a nonwoven fabric of excellent quality by narrowing the nozzle spacing (l ₀ ) distance to 150mm or less. According to the present invention, it is possible to install a larger number of nozzles 190, thereby increasing productivity and manufacturing a product having a more uniform density distribution. That is, in the prior art, the tensile strength ratio in the longitudinal direction and the transverse direction is 1.2 or more, so that the longitudinal tensile strength is still high, but the tensile strength ratio in the longitudinal direction and the transverse direction can achieve 1.0 by the method of the present invention.

와 동일하다.Here, L ₁ is the total sum of the horizontal intervals (l ₁ ) of the nozzles 190, and L ₀ is the sum of the nozzle intervals (l ₀ ). So L ₀ and The angle formed by L ₁ is also the angle formed by l ₀ and l ₁

Is the same as

In addition, in the present invention, a long fiber nonwoven fabric having a uniform density distribution may be manufactured by the airflow interference prevention plate 200 installed under the nozzle 190.

In the prior art, a collision plate 10 is provided to generate static electricity due to friction, and the filaments collide with the collision plate 10 to generate triboelectricity. Therefore, in order to generate more static electricity, there was no choice but to increase the amount of compressed air supplied to the stretched pipe 30, and in order to effectively generate friction, a heavy metal material such as lead (Pb) having a high charging sequence with the synthetic fiber was used as a collision plate. It was used as the material of (10). In addition, when the nozzles 20 are arranged, there is a limit of using the collision plate 10 as a long integral type in the front while the nozzles 20 are arranged in a line.

However, in the present invention, the radiation block 130 or a plurality of elongated pipes 160 ′ and a plurality of nozzles 190 are arranged in a non-zero inclination with respect to a direction perpendicular from the traveling direction of the conveyor 210 to form an inclination angle. do. Therefore, in order to minimize airflow interference between adjacent nozzles 190, instead of the integral long collision plate 10, an airflow interference prevention plate 200 having a width shorter than that of the collision plate is provided in the front and lower portions of each nozzle 190. The air flow interference prevention plate 200 prevents turbulence of air from being generated as a large amount of air flow discharged from the adjacent nozzle 190 diffuses, and blocks air flow.

When the long integrated collision plate 10 adopted in the prior art is used, the airflow may be scattered in both directions of the width, so it is impossible to prevent the phenomenon that the nozzles 20 interfere with each other. When airflow interferes, not only does it hinder the progression of the filaments moving in both directions of the width, but also causes vortices, so that the weight distribution of the nonwoven fabric and the ratio of the tensile strength in the longitudinal and transverse directions may also be poor. Accordingly, in the present invention, in order to solve this problem, the airflow interference prevention plate 200 divided for each nozzle 190 is provided to prevent the occurrence of vortex of air and block the airflow.

The width (l _a ) of the airflow interference prevention plate 200 of the present invention is preferably a value of about the horizontal distance (l ₁ ) + (20mm to 100mm) of the nozzle 190, and more preferably The horizontal spacing (l ₁ ) + (20mm to 60mm) level is preferable.

Here, if the width l _a is too short, the airflow moving in the transverse direction may flow out in the web traveling direction, and accordingly, a situation in which the weight distribution and the longitudinal tensile strength increase may occur. Conversely, if the width l _a is too long, there is a problem that it is difficult to install and operate.

The material of the airflow interference prevention plate 200 is preferably an uninterruptible material such as ceramic, but a grounded conductor may be used. In addition, a material charged with the same polarity as the charged filaments may be used. As a result, if the charged filaments do not stick to the airflow interference prevention plate 200, any material may be used.

The vertical length (l _b ) of the airflow interference prevention plate 200 is preferably 50mm to 150mm. Here, if the vertical length (l _b ) of the airflow interference prevention plate 200 is too short, the airflow moving in the lower direction may flow out in the direction in which the web travels, that is, in the direction conveyed by the conveyor 210, and accordingly The weight distribution and longitudinal tensile strength can be increased. In addition, if the vertical length (l _b ) of the airflow interference prevention plate 200 is too long, the speed at which the filaments are discharged from the nozzle 190 decreases, resulting in a problem that fibers are attached to the airflow interference prevention plate 200. . Therefore, it would be desirable to maintain the width (l _a ) and the vertical length (l _b ) of the airflow interference prevention plate 200 as described above.

Although it is preferable to keep the airflow interference prevention plate 200 vertically, it may be formed by maintaining a certain angle to prevent adhesion of the filaments discharged from the nozzle 190. That is, if the angle β at which the airflow interference prevention plate 200 is inclined in the vertical direction from the ground is too large, the airflow is discharged in the direction of the web traveling, that is, the direction conveyed by the conveyor 210, resulting in a weight distribution. Fall off, and the longitudinal tensile strength can be increased. Therefore, it is maintained at 30 degrees or less, more preferably 20 degrees or less.

It is also necessary to maintain a constant distance (d) between the airflow interference prevention plate 200 and the nozzle 190. When the gap d is narrow, the nozzle 190 may be clogged by phenomena such as Yarn Break and Drop, which are caused by intermittent radioactive defects. In addition, when the distance d is wide, the running speed of the filaments discharged from the nozzle 190 decreases, and the filaments may be attached to the airflow interference prevention plate 200. Therefore, it is desirable to maintain the interval between the airflow interference prevention plate 200 and the nozzle 190 at a level of 6mm to 30mm.

As shown in FIG. 3, in the present invention, in order to further increase productivity, two or more radiating blocks 130 may be provided in a direction in which the web proceeds. In this case, the spacing W between the radiation blocks 130 disposed in plurality is important. That is, if the spacing (W) between the spinning blocks 130 is narrow, air flows injected from the front and rear rows interfere with each other, resulting in a non-uniform density distribution of the filaments. Conversely, if the spacing (W) increases, the air interference Although the possibility is reduced, the size of the conveyor 210 is increased more than necessary, making it difficult and costly. Therefore, there is a need to maintain a suitable spacing (W), which is preferably 0.5M to 2.0M level.

In the present invention, as shown in the drawing, it may be provided with a DC corona charging unit 170. This will be described with reference to FIG. 5.

5 is an enlarged schematic view of a structure for charging the filaments drawn and discharged in the apparatus for manufacturing the long-fiber nonwoven fabric shown in FIG. 2.

As shown in Fig. 5, the corona charging unit 170 connects the direct current high voltage generated by the high voltage generator 180 (High Voltage Generator, HVG) to the charging needle 172 to emit an ion beam. It radiates corona. The direct current ions generated from the charging needle 172 are attached to and charged to the surfaces of the filaments that move continuously, so that the fibers can be separated and diffused by the repulsive force of the ions charged to the same pole.

In the present invention, the corona charging unit 170 introduces compressed air into the corona charging unit 170 to increase the amount of ions attached to the fiber surface. Compressed air should be clean air that does not contain moisture and impurities (Instrument Air, IA). If air containing moisture and impurities is used, sparks may occur or insulated portions may be destroyed when charged at high pressure, and problems such as contamination of the charging needle 172 may occur. The charging electrode 171 is made of copper or brass material, which is easy to conduct electricity, and is provided with stainless steel having excellent strength and toughness for the charging needle 172, and the charging electrode 171 Holes with a diameter of 0.3 mm to 1.0 mm are formed on the surface of the. Although the supply amount of compressed air is not determined, the pressure of compressed air supplied to the rear end of the charging electrode 171 is adjusted to a level of 0.05 to 1.0 kg/cm 2 G.

Compressed air introduced into the corona charging unit 170 may be ejected around the charging needle 172 through a hole formed in the charging electrode 171. The ejected compressed air increases the amount of ions generated at the tip of the charging needle 172, and allows the ions of the charged air to more easily contact the filaments, thereby increasing the amount of ions attached to the filaments and at the same time being uniformly attached. do. In addition, it may also play a role of increasing the life of the charging needle 172 by preventing contaminants from adhering to the surface of the charging needle 172.

In addition, a protective cover 173 is provided in front of the charging needle 172 to protect filaments or other foreign substances from directly contacting the charging needle 172. The material of the protective cover 173 is made of an insulating material that does not conduct electricity.

The size of the passage through which compressed air is introduced into the charging electrode 171 is formed so that air always flows into the tip of the charging needle 172 so that the air pressure can be adjusted. If the supply pressure of the compressed air is high, it may come into contact with the filament and air flow discharged vertically downward, resulting in a vortex. Therefore, it is desirable to use it by keeping the pressure of the incoming compressed air low.

In addition, in the present invention, the corona charging unit 170 and the structure may be variously implemented through FIGS. 6 and 7.

6 is a view schematically showing another embodiment of the structure for charging the filaments shown in Figure 5, Figure 7 is a view schematically showing another embodiment of the structure for charging the filaments shown in FIG.

As shown in FIGS. 6 to 7, in the present invention, it is also possible to position the corona charging unit 170 below the nozzle 190. That is, in FIG. 6, when the filaments drawn through the stretching pipe 160 ′ are discharged from the nozzle 190, they first collide with the airflow interference prevention plate 200 and then are charged by the corona charging unit 170. Accordingly, even if the filaments are not charged when discharged from the nozzle 190, the filaments may be charged by the corona charging unit 170 after being ejected, and the compressed air flowing into the corona charging unit 170 is a charging electrode ( By being ejected around the charging needle 172 through the hole formed in the 171, the amount of ions generated at the tip of the charging needle 172 is increased, and the charged air ions are made to contact the filaments more easily. At the same time, it can be uniformly attached while increasing the amount of ions attached to.

In addition, in FIG. 7, the corona charging portion 170 may also be formed with a side inclined by an angle β at which the airflow interference preventing plate 200 is inclined in a vertical direction from the ground. Accordingly, the charging needle 172 provided inside the corona charging unit 170 is also elongated as the side surface of the corona charging unit 170 goes downward, so that the airflow interference prevention plate 200 is inclined in a vertical direction from the ground. It is possible to maintain the charged position at the losing angle β.

As a result, in the present invention, in the present invention, the spinning block 130 melts the thermoplastic synthetic fiber at a high temperature and spins it into the filament bundle 1 of long fibers, stretches the spun filaments through the plurality of stretching pipes 160 ′, and A nozzle 190 connected to each of the stretching pipes 160 ′ discharges the filaments, the airflow interference prevention plate 200 blocks the flow of air applied to the filaments, and the filaments are collected and arranged by the conveyor 210, By transporting the filaments in the first direction and bonding them, a long fiber nonwoven fabric can be manufactured.

In the present invention, the corona charging unit 170 is a particularly useful method when increasing the number of strands of the filament in order to increase productivity, and a low-weight nonwoven fabric of 60 gr/m 2 or less or a thin filament having a thickness of 3 denier or less. For example, a low weight nonwoven fabric of 20 gr/m2 or less tends to have a non-uniform density distribution due to the high speed of the conveyor 210, and is likely to be arranged in the longitudinal direction in which the long fiber filaments constituting the nonwoven fabric are manufactured. However, when compressed air is introduced into the corona charging unit 170 and the corona charging unit 170 as in the present invention, the filaments are easily charged, separated and dispersed, and problems such as twisting and entanglement between the filaments are caused. The probability of occurrence is reduced, and a nonwoven fabric having excellent weight distribution can be manufactured. In addition, regardless of the thickness and number of filaments, the fiber surface can be sufficiently charged and dispersed.

This is an effect that is impossible in the conventional friction-type charging method, and in the present invention, compressed air is introduced to easily charge the charging needle 172 and the service life can be improved. Therefore, in the present invention, by providing the corona charging unit 170, it is possible to improve both productivity and quality, as well as provide various product lines to be produced in the same facility.

As described above, the present invention provides an excellent technology that satisfies both the weight distribution and the aspect strength ratio of the long fiber nonwoven fabric. In particular, a new long fiber nonwoven fabric manufacturing technology with excellent weight distribution and strength ratio in the vertical and transverse directions is provided even for low weight products of 60gr/m2 or less and ultra-low weight of 20gr/m2 or less. In addition, it is possible to improve productivity regardless of the thickness of the filament to be manufactured, and at the same time, it is friendly to the human body and environmentally friendly even when manufacturing and using long fiber nonwoven products.

Hereinafter, an embodiment of the present invention will be described. The effects and results of the present invention are not limited to the following examples. The physical properties of the nonwoven fabrics manufactured in this Example and Comparative Example were evaluated using JIS L 1906 (evaluation method for long fiber nonwoven fabric). This embodiment was implemented based on the structure of the apparatus shown in FIGS. 2 to 7 and the above description.

[Examples 1 to 3, Comparative Examples 1 to 2]

A polyester chip having an intrinsic viscosity (IV) of 0.655 was melted at a spinning temperature of 296° C. to prepare filaments through a spinning nozzle. At this time, the discharge amount was set so that the spinning speed was 5,200m/min by adjusting the pressure of the compressed air flowing into the stretching pipe 160', and the thickness of the manufactured filaments was manufactured to 9 denier. The number of filaments introduced into the stretched pipe 160' was adjusted to 20 to 40, and the weight distribution of the nonwoven fabric and the tensile strength and ratio in the longitudinal and transverse directions were investigated, respectively, along with the production capacity change.

In addition, the inclination angle of the spinning block 130 was fixed at 35 degrees, and the nozzle spacing (l ₀ ) was fixed at 80 mm. The width (l _a ) and the vertical length (l _b ) of the airflow interference prevention plate 200 were 120mm, the distance d=15mm between the nozzle 190 and the airflow interference prevention plate 200, and the angle was fixed vertically. The high voltage of the DC high voltage generator 180 introduced into the corona charging unit 170 was fixed at 22KV, and the air pressure was constantly supplied at 0.25Kg/cm2G.

In the comparative example, the apparatus of FIG. 1 was used, and the horizontal gap (l ₁ ) of the nozzle 190 was fixed at 80 mm, and lead (Pb), which was advantageous for frictional charging, was used as the material of the collision plate 10.

The width of the prepared nonwoven fabric was 1.0m, the surface temperature of the calender roll 230 for thermal bonding used in the manufacture of the nonwoven fabric was fixed at 254°C, and the line pressure was 47Kg/cm. Finally, the weight of the nonwoven fabric wound around the winder 250 was 80gr/m2.

In the investigation of the weight distribution of the prepared nonwoven fabric, a sample in the width direction was collected and CV% was evaluated. As for the nonwoven fabric sample for weight evaluation, MD and CD were each fixed at 10 cm, and 10 samples were collected in the width direction and first irradiated, and 10 samples were collected again in the same manner after 10 M in the length direction to investigate CV%. . The results of the two evaluations were synthesized and recorded in Table 1 below. In addition, using this sample, defects such as twist, roping, and entanglement of the filaments appearing on the surface of the nonwoven fabric were visually observed by three evaluators and recorded in five stages (1: Very Bad, 2: bad, 3: moderate, 4: good, 5: very good).

Tensile strength, tear strength = MD/CD division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Number of filament strands
(Dog/extension part) 30 35 40 20 30 Discharge
(gr/min/extension part) 156 182 208 104 156

part
Straight
artillery
water
castle Weight distribution
(CV%) 4.1 4.6 4.8 6.2 7.5 The tensile strength
(Kg/5cm) 13.7/
13.8 13.3/
13.9 13.2/
13.3 16.5/8.2 16.1/7.9 Tensile strength ratio
(MD/CD) 1.0 1.0 1.0 2.0 2.0 Tear strength
(Kgf) 1.1/1.3 1.2/1.2 1.2/1.1 0.8/1.4 0.7/1.2 Flaw evaluation
score 5 5 4 2 One

[Examples 4 to 7 and Comparative Examples 3 to 4]

Filaments were prepared at a spinning temperature of 220° C. using a polypropylene chip having a Melt Index (MI) of 26. At this time, the spinning speed was 3,600 m/min, and the thickness of the filaments was adjusted to 2.2 denier. The number of strands of the filaments introduced into the stretching pipe 160' is fixed at 200, and the DC high voltage electricity of the corona charging unit 170 is 24KV and the air pressure is constant at 0.40Kg/cm2. The speed of the conveyor 210 was adjusted so that the weight of the final manufactured nonwoven fabric was 24gr/m2. The temperature of the calender roll 230 for thermal bonding was fixed at 164°C and the line pressure at 35Kg/cm. At this time, the nozzle spacing (l ₀ ) was fixed to 85mm, and the physical properties of the nonwoven fabric were investigated while changing the inclination angle of the spinning block 130 to 0 degrees to 80 degrees. Other manufacturing apparatus and conditions were as in Example 1, and the physical properties of the manufactured nonwoven fabric were also investigated as in Example 1. The results were investigated and shown as in Table 2. In Comparative Example 4, the same apparatus as in Comparative Example 1 was used, and the number of strands of the filaments introduced into the stretching pipe 160' was fixed to 100.

Tensile strength, tear strength = MD/CD division Example 4 Example 5 Example 6 Example 7 Comparative Example 3 Comparative Example 4 Radiation block
Angle (degrees) 20 35 45 60 15 0 Vertical distance between nozzles (mm) 30 49 60 74 22 0 Horizontal distance between nozzles (mm) 80 70 60 43 82 80
part
Straight
artillery
water
castle Weight distribution
(CV%) 4.8 4.1 3.6 3.5 6.9 7.3 The tensile strength
(Kg/5cm) 6.6/5.6 5.9/5.7 5.8/5.9 5.4/6.1 6.4/3.9 7.8/2.6 Tensile strength ratio
(MD/CD) 1.2 1.0 1.0 0.9 1.6 2.8 Tear strength
(Kgf) 0.2/0.2 0.2/0.2 0.2/0.3 0.2/0.2 0.1/0.3 0.1/0.3 Flaw evaluation
score 4 5 5 5 2 One

[Examples 8 to 12, Comparative Example 5]

The test was performed by setting the same conditions as in Example 5. The inclination angle of the radiation block 130 was fixed to 38 degrees. At this time, the test was performed while continuously changing the nozzle spacing (l ₀ ) from 30mm to 200mm. The results were examined and shown in Table 3.

Tensile strength, tear strength = MD/CD division Example 8 Example 9 Example 10 Example 11 Example 12 Comparative Example 5 Vertical distance between nozzles (mm) 30 40 80 120 150 200 Horizontal distance between nozzles (mm) 23 31 63 94 117 156
part
Straight
artillery
water
castle Weight distribution
(CV%) 3.8 4.0 4.3 4.8 4.9 6.8 The tensile strength
(Kg/5cm) 6.4/5.6 6.4/5.8 6.2/6.1 5.9/6.3 5.6/5.7 4.7/5.4 Tensile strength ratio (MD/CD) 1.1 1.1 1.0 0.9 1.0 0.9 Tear strength
(Kgf) 0.1/0.2 0.2/0.2 0.2/0.2 0.2/0.2 0.3/0.2 0.3/0.1 Defect evaluation score 4 5 5 4 3.5 One

[Examples 13 to 15, Comparative Examples 6 to 8]

The test was performed by setting the same conditions as in Example 5. The test was conducted while changing the direct current high-voltage electric and air pressure of the corona charging unit 170. The weight of the prepared nonwoven fabric at this time was 18gr/m2. The high voltage generator 180 was adjusted to generate a maximum voltage while adjusting the current to be 6 mmA or less. The results were examined and shown in Table 4.

Tensile strength, tear strength = MD/CD division Example 13 Example 14 Example 15 Comparative Example 6 Comparative Example 7 Comparative Example 8 HVG voltage (KV) 15 20 24 30 22 0 Corona charging unit supply air pressure (Kg/㎠G) 0.15 0.15 0.15 0.15 0 0


part
Straight
artillery
water
castle Weight distribution
(CV%) 4.9 4.3 4.2 Discharge
Occur
/Sample
Produce
impossible 5.8 weight
Distribution
Poor/
Properties
Measure
impossible The tensile strength
(Kg/5cm) 4.6/4.3 4.7/4.5 4.6/4.5 4.1/3.8 Tensile strength ratio
(MD/CD) 1.0 1.0 1.0 1.0 Tear strength
(Kgf) 0.1/0.1 0.1/0.1 0.1/0.1 0.1/0.2 Flaw evaluation
score 4 5 5 3

[Example 16, Comparative Examples 9 to 11]

The test was conducted as in Example 2. The distance (d) between the airflow interference prevention plate 200 and the nozzle 190, the vertical angle (β) of the airflow interference prevention plate 200, and the width (l _a ) and length of the airflow interference prevention plate 200 The test was carried out while adjusting (l _b ). The weight of the nonwoven fabric was manufactured at 30gr/m2. The test and evaluation results were examined and shown in Table 5.

Tensile strength, tear strength = MD/CD division Example 16 Comparative Example 9 Comparative Example 10 Comparative Example 11 Spacing(mm) 15 15 15 30 Width(mm) 120 120 120 120 Length (mm) 100 100 50 120 Angle (degrees) 20 30 20 10
part
Straight
artillery
water
castle Weight distribution
(CV%) 4.0 4.6 5.3 Airflow interference
Prevention plate
Fiber attachment
Occur
/Sample
Produce
impossible The tensile strength
(Kg/5cm) 7.3/7.5 8.6/6.1 7.9/6.3 Tensile strength ratio
(MD/CD) 1.0 1.4 1.3 Tear strength
(Kgf) 0.3/0.2 0.2/0.3 0.3/0.3 Defect evaluation score 5 4 3

Hereinafter, another embodiment of an apparatus for manufacturing a long fiber nonwoven fabric will be described with reference to FIGS. 8 and 9.

Figure 8 is a view showing another embodiment of the device for manufacturing a long-fiber nonwoven fabric according to the embodiment of the present invention shown in Figure 2, Figure 9 is a suction port by rotating a cover provided on one side of the suction port 161 in FIG. It is a diagram schematically showing the adjustment of the size of 161.

8 and 9, the apparatus for manufacturing a long-fiber nonwoven fabric according to the present invention includes a suction port 161, a guide member 162, and a stretch pipe cover 163 under the stretch pipe 160'. It may be additionally provided.

The inlet 161 is formed at a lower side of the stretching pipe 160 ′ so that external air is additionally introduced into the stretching pipe 160 ′ and injects air into the surface of the filament.

The guide member 162 is formed in the inside of the stretching pipe 160 ′, directly below the point where the inlet 161 is formed on one side of the stretching pipe 160 ′, and transfers air introduced into the inlet 161 to the stretching pipe 160. It is a configuration that guides the flow into the interior of'). The guide member 162 may be formed in a shape in which the length of the hem g does not completely block the inner diameter of the stretched pipe 160 ′. That is, the stretched filament moves in the stretching pipe 160 ′, in which case the guide member 162 is formed to narrow the inside of the stretching pipe 160 ′ to the length of the hem g, thereby flowing into the suction port 161. It guides the air so that it can be effectively introduced into the interior of the stretching pipe 160 ′, and thus the introduced air can further reach the surface of the filaments. Accordingly, the guide member 162 narrows the inner diameter of the stretching pipe 160 ′, but does not completely block it, and may be formed to have a length through which the introduced air can be effectively introduced.

The stretched pipe cover 163 is provided along the circumference of the stretched pipe 160' based on the point where the inlet 161 is formed in the stretched pipe 160', and rotates the circumference of the stretched pipe 160' to rotate the suction port ( 161) can be adjusted in size. If the size of the suction port 161 is reduced by the stretch pipe cover 163, the amount of air introduced into the interior of the stretch pipe 160' may be reduced. Accordingly, a worker manufacturing the long-fiber nonwoven fabric can adjust the air contacting the filaments moving inside the elongated pipe 160' by adjusting the size of the inlet 161.

In addition, the charging airflow interference prevention plate 200 ′ is provided in a state spaced apart from the nozzle 190 by a predetermined distance as in the previous embodiment, and may additionally charge the filament by receiving a voltage from the high voltage generator. . The anti-static plate cover 201 is enclosed around the charged airflow interference preventing plate 200' so that only a certain area can be exposed to the outside. Accordingly, at least one of the plurality of surfaces of the charged airflow interference prevention plate 200 ′ is provided as a metal surface, which may be charged by applying a voltage from the high voltage generator 180.

The charging airflow interference prevention plate 200 ′ may additionally charge the filaments in order to more efficiently charge the filaments. In order to further improve productivity in the apparatus for manufacturing a long-fiber nonwoven fabric according to the present invention, the efficiency of corona charging directly applied to the filament surface must be increased, and an additional charging amount must be supplied. Therefore, if the charged airflow interference prevention plate 200' supplies a sufficient amount of static electricity to the surfaces of the filaments running at high speed, and the supplied static electricity is uniformly charged on the surfaces of the filaments, the fibers are twisted together even if the number of filaments is increased (Twist), entanglement (entanglement), the phenomenon that causes the defects of the nonwoven fabric such as agglomeration does not appear.

Here, the prevention plate cover 201 insulates at least a portion of the charged airflow interference prevention plate 200' from the outside, and only a portion of the metal surface facing the nozzle 190 in the charged airflow interference prevention plate 200' Exposed to.

Even if the number of filaments is increased, phenomena that cause defects of nonwoven fabrics such as twisting, entanglement, and agglomeration of fibers do not appear. It can be evaluated by doing this, but experimentally, it can be confirmed indirectly by measuring the amount of charge (or amount of charge) on the surface of the filaments.

Hereinafter, main components of the present invention shown in FIGS. 8 and 9 will be described in detail. In FIG. 8, the corona charging unit 170 is the same as the corona charging unit 170 shown in FIGS. 2 to 7. However, in order to improve the charge amount and efficiency of the corona charging unit 170, the structure of the stretching pipe 160 ′ in the stretching unit connected to the corona charging unit 170 has been changed.

In the present invention, as a result of repeatedly performing an experiment to effectively charge the surfaces of the filaments in the corona charging unit 170, it has been found that the efficiency increases rapidly under certain conditions. That is, the distance (D _c1 ) of the filaments and the tip of the charging needle 172 at which the corona is generated in the corona charging unit 170 is important. In addition, in order to charge the surfaces of all filaments as uniformly as possible, the fibers should be arranged in a straight line and parallel so as not to overlap each other as much as possible. Therefore, if the fibers can be arranged in parallel without overlapping and the variation of the distance D _c1 can be minimized, it is more preferable for the production of a high-quality product since it can keep a constant distance D _c1 .

First, a suction port 161 through which an external air flow is introduced is formed at the upper end of the corona charging unit 170 where the charging needle 172 is installed under the stretching pipe 160 ′. In addition, an elongated pipe cover 163 is provided to control or seal the amount of incoming air. By installing the stretch pipe cover 163, it is possible to adjust the amount of air flowing into the stretch pipe 160'. As external air is introduced, the direction of the air flow inside the stretch pipe 160' is naturally inside the corona charging unit 170 It is focused toward the ground electrode 174 of. In order to further accelerate this phenomenon, a guide member 162 is provided immediately below the suction port 161. The guide member 162 more actively sends the air flow to the ground electrode 174, and at this time, all the filaments moving along the air flow are also directed to the ground electrode 174.

As described above, the filaments moving in a disorderly downward direction from the inside of the stretching pipe 160' are aligned while moving in the direction of the ground electrode 174 by the action of the guide member 162 and the air flow introduced from the external air inlet 161. Is done. At this time, the length (g) of the hem of the guide member 162 can be expressed as (the inner spacing (D _p ) of the elongated pipe (160')-the inner minimum spacing (D _p1 )), which is the inner spacing (D _p ). Keep between the level of one-fifth and one-third. If the inner minimum distance (D _p1 ) is greater than one-third, filaments traveling inside the elongated pipe 160' are caught by the guide member 162 and are blocked. In addition, if the internal minimum spacing (D _p1 ) is less than 1/5, the mobility of the filaments in the direction of the ground electrode 174 decreases, and the filaments are not well arranged in a straight line, so that charging efficiency decreases.

The suction port 161 is spaced apart from the corona charging unit 170 in a vertical upper direction. The location of the suction port 161 may be located at a distance of about 2 to 6 times from the upper end of the corona charging unit 170 than the internal distance D _p . In addition, the area of the suction port 161 is preferably about 0.2 to 1.0 times the inner area of the stretched pipe 160 ′, and preferably within 0.4 to 0.8 times. The opening area and position of the suction port 161 and the position and size of the guide member 162 may be finely adjusted while checking the charged state of the fiber produced during actual production.

Next, a detailed description will be given of the charging airflow interference prevention plate 200', which is the main device developed and applied in the present invention. In the present invention, a further improved method for primarily charging the filaments in the corona charging unit 170 is proposed. In the present invention, as a result of designing, testing, and evaluating a method for further improving productivity without deterioration in quality, a charge airflow interference prevention plate 200' is provided.

In FIGS. 2 to 7 of the present invention, an airflow interference prevention plate 200 is proposed. This airflow interference prevention plate 200 does not impart additional ions to the filament. However, the main purpose is to block the vortex of the air and fibers sprayed from the adjacent nozzle 190, and move and arrange the fibers ejected from the nozzle 190 in the transverse direction.

In addition, a structure for dispersing filaments by installing a corona charging unit 170 on the opposite side of the airflow interference prevention plate 200 is proposed. This structure is a specific example in which the corona charging unit 170 disposed above the nozzle 190 is moved and disposed under the nozzle 190 to simultaneously charge the filaments and block eddy currents. Even in such an example, it cannot be said that it is a function of imparting an active additional charging to the filaments as well as first charging.

On the other hand, in FIG. 8, the charged airflow interference prevention plate 200' has a prevention plate cover 20 to block electric leakage from high voltage direct current electricity, and a metal charged airflow interference prevention plate inside the prevention plate cover 20 ( 200') is installed. The charged airflow interference prevention plate 200 ′ is provided with a metal surface facing the nozzle 190 so that the filaments ejected from the nozzle 190 can directly contact.

In addition, the distance (D _c2 ) between the nozzle 190 and the charged airflow interference prevention plate (200') is compared with the inner distance (D _p ) of the stretched pipe (160'), and the distance (D _c2 ) is the inner distance (D _p) ) Can be expressed as 0.5 to 2 times. If the distance (D _c2 ) between the nozzle 190 and the charged air flow interference prevention plate 200 ′ is too narrow, the space in which the filaments move downward is too narrow to increase the possibility of clogging, and the nozzle 190 and the charged air flow If the distance (D _c2 ) with the interference prevention plate 200 ′ is too wide, the speed of the filaments decreases, so that the transverse movement of the charged filaments on the air flow interference prevention plate 200 ′ is slowed. Therefore, it is important to properly maintain the distance (D _c2 ) between the nozzle 190 and the charged airflow interference prevention plate 200'.

In addition, as an inherent function of the charging airflow interference prevention plate 200', it is possible to prevent air flow from the adjacent nozzle 190 and simultaneously perform functions such as transverse movement of the filaments. Accordingly, the width and length of the charged airflow interference prevention plate 200 ′ are the same as those described in FIGS. 2 to 7 above, and the angle β provided in the vertical direction with respect to the ground is also the same. Therefore, the charging airflow interference prevention plate 200' is added to perform corona charging on the filaments. A conductor is preferable as the material of such an anti-static airflow interference prevention plate 200', especially copper, brass, and stainless steel. Use materials that are not sensitive.

The DC charging voltage is supplied from the high voltage generator, and the voltage is at the level of 10 to 30 KV. Such a charged airflow interference prevention plate 200 ′ may be supplied with a voltage simultaneously with the corona charging unit 170 from one existing high voltage charging unit, and an additional high voltage charging unit is added to the charged airflow interference prevention plate 200 ′. You can only approve it. When the charging airflow interference prevention plate 200 ′ is supplied with a voltage of less than 10KV, charging performance of the filaments may be poor, and thus the separation and dispersion function of the filaments may be deteriorated. In addition, when the charged airflow interference prevention plate 200 ′ is supplied with a high voltage DC electric current of 30KV or more, the insulation voltage of air may be exceeded, resulting in sparks or plasma discharge. Accordingly, electricity supplied to the charged airflow interference prevention plate 200 ′ may be radiated into the air, resulting in a dangerous situation. Therefore, the high voltage charging unit supplying voltage to the charged airflow interference prevention plate 200 ′ may be applied equally to the amount of the high voltage generation unit supplying voltage to the corona charging unit 170.

In addition, the polarity ("+" or "-") of direct current high voltage electricity is often determined in consideration of the electrostatic charging sequence of the filaments. In general, thermoplastic synthetic fibers are charged by supplying a negative charge (-).

As a result, in the present invention, the spinning block 130 melts the thermoplastic synthetic fiber at a high temperature and spins it into a filament bundle of long fibers, stretches the spun filaments through the plurality of stretch pipes 160', and a plurality of stretch pipes ( A plurality of nozzles 190 connected every 160') discharge filaments, the filaments are collected and arranged by a conveyor, and finally, a long-fiber nonwoven fabric can be manufactured in large quantities, including transporting and bonding the arranged filaments.

In addition, the spinning block 130 melts the thermoplastic synthetic fiber at a high temperature and spins it into a filament bundle of long fibers, stretches the spun filaments through a plurality of stretching pipes 160 ′, and for each of the plurality of stretching pipes 160 ′. A plurality of connected nozzles 190 discharge the filaments, the charging airflow interference prevention plate 200' blocks the flow of air applied to the filaments, attaches additional ions to the filaments, and the filaments are It is collected and arranged, it is possible to manufacture a large amount of long fiber non-woven fabric, including transporting and bonding the arranged filaments.

Hereinafter, results of experiments on other embodiments of the present invention will be described. The effects and results of the present invention are not limited to the following examples. The physical properties of the nonwoven fabrics manufactured in this Example and Comparative Example were evaluated using JIS L 1906 (evaluation method for long fiber nonwoven fabric). This embodiment was implemented based on the structure of the apparatus shown in FIGS. 2 to 9 and the above description.

[Examples 17 to 19], Comparative Examples 12 to 14]

First, a test apparatus for examining the effect of the inlet 161 and the guide member 162 connected to the corona charging unit 170 was prepared among the test apparatus of FIG. 8. The airflow interference prevention plate 200 was used as shown in FIGS. 2 to 7.

The test was conducted while adjusting the area and the spacing (D _p1 ) of the suction port 161. The inner spacing (D _p ) of the stretched pipe 160' was fixed at 12 mm, and the cross-sectional area was set at a level of about 100 mm 2. The position of the suction port 161 was provided in the upper 30mm of the corona charging unit 170.

Filaments were prepared at a spinning temperature of 220° C. using a polypropylene chip having a Melt Index (MI) of 26. In addition, the inclination angle of the spinning block 130 was fixed at 33 degrees, and the nozzle spacing (l ₀ ) was fixed at 90 mm. At this time, the spinning speed was 3,400 m/min, and the thickness of the filaments was adjusted to 2.2 denier. The number of strands of the filaments introduced into the stretching pipe 160 ′ was fixed at 260, and the DC high voltage electricity of the corona charging unit 170 was supplied at a constant rate of 22 KV and the air pressure at 0.5 Kg/cm 2. The width of the nonwoven fabric was manufactured to 1.0M by adjusting the speed of the conveyor so that the weight of the final fabricated nonwoven fabric was 20gr/m2. The temperature of the calender roll for thermal bonding was fixed at 162° C. and the line pressure at 33 Kg/cm. The width (l _a ) and the vertical length (l _b ) of the airflow interference prevention plate 200 were respectively 140mm and 110mm, d=15mm, and the angle β was fixed to 10 degrees.

In order to investigate the amount of charge of the manufactured filaments, a Faraday cage 260 was installed on the conveyor as shown in FIG. 8 as shown in the figure. The electric charge meter used a commonly used electric charge meter. The connection between the Faraday cage 260 and the electric charge meter is shown in FIG. 8, and in particular, attention should be paid to insulation and grounding of the Faraday cage. The conductor portion of the Faraday cage 260 allows air to permeate and a stainless mesh mesh was used to collect the filaments, and the non-conductor, which is an insulating material, was used as beckrite.

Therefore, when the filaments charged in the corona charging unit 170 are collected in the Faraday cage 260, the charges of the filaments move and are measured by a measuring device. At this time, the charge performance is evaluated by measuring the time until the electric charge reaches 1,000nC in the electric charge meter. It is judged that the faster the arrival time, the higher the charging amount and the charging performance is improved. At this time, since the performance varies depending on the number and discharge amount of filaments, two factors of the number and discharge amount of filaments should be fixed during the evaluation test.

In the investigation of the weight distribution of the prepared nonwoven fabric, a sample in the width direction was collected and CV% was evaluated. The non-woven fabric sample for weight evaluation was fixed at 10cm each of MD and CD, and 10 samples were collected in the width direction and first irradiated, and 10 samples were collected again in the same manner after 10M in the length direction to investigate CV%. . The results of the two evaluations were summarized and recorded in Table 5 below. Also, using this sample, defects such as Twist, Roping, and Entanglement of the filaments appearing on the surface of the nonwoven fabric were visually observed by three evaluators and recorded in five stages (1: Very Bad, 2: bad, 3: moderate, 4: good, 5: very good). The test results were examined and shown in Table 6.

Tensile strength, tear strength = MD/CD division Example 17 Example 18 Example 19 Comparative Example 12 Comparative Example 13 Comparative Example 14 Air intake area
(㎟) 60 100 30 0 50 80 Spacing ((D _p1 )(mm) 8 8 9 8 6 12


part
Straight
artillery
water
castle Weight distribution
(CV%) 4.6 4.5 4.7 5.4


Stretching
Part (160)
inside
catch
Occur 5.3 Reaching the amount of charge
Time in seconds 3.4 3.3 3.9 4.6 4.8 The tensile strength
(Kg/5cm) 4.3/4.2 4.4/4.5 4.3/4.3 4.2/4.1 3.9/4.1 Tensile strength ratio
(MD/CD) 1.0 1.0 1.0 1.0 1.0 Tear strength
(Kgf) 0.1/0.1 0.1/0.1 0.1/0.1 0.1/0.2 0.1/0.2 Defect evaluation score 4 4 4 3 3

[Examples 20 to 24, Comparative Example 15]

The test was conducted by setting the same conditions as in Example 1. In the configuration of FIG. 8, a test was prepared to investigate the effect of the distance (D _c1 ) between the end of the charging needle 172 of the corona charging unit 170 and the ground electrode 174. The airflow interference prevention plate 200 was used as shown in FIGS. 2 to 7.

The test was carried out by fixing the area of the suction port 161 to 100 mm 2 and the minimum internal spacing (D _p1 ) = 9 mm. The inner spacing (D _p ) of the stretched pipe 160' was fixed at 14 mm, and the cross-sectional area was about 150 mm 2. The position of the suction port 161 was located 35 mm away from the upper end of the corona charging unit 170. The number of filaments supplied to the stretching pipe 160' was changed to 240-300, and the test was conducted while adjusting the discharge amount so that the thickness of the filaments became 2.0 denier. The final weight of the prepared nonwoven fabric was 20gr/m2. The test was carried out in this way and the results are shown in Table 7.

Tensile strength, tear strength = MD/CD division Example 20 Example 21 Example 22 Example 23 Comparative Example 15 Example 24 Number of filament strands (pcs) 240 240 240 240 240 300 Spacing ((Dc ₁ ), mm 15 20 30 10 8 12

part
Straight
artillery
water
castle Weight distribution
(CV%) 4.5 4.8 4.9 4.5

Corona charging department
(170)
inside
Discharge
Occur 4.8 Reaching the electric charge
Time in seconds 3.7 4.1 4.5 3.5 3.3 The tensile strength
(Kg/5cm) 4.5/4.6 4.3/4.6 4.0/4.3 4.6/4.2 4.1/4.1 Tensile strength ratio (MD/CD) 1.0 1.0 1.0 1.0 1.0 Tear strength
(Kgf) 0.2/0.1 0.2/0.1 0.1/0.1 0.1/0.1 0.1/0.1 Defect evaluation score 4 4 4 4 4

[Examples 25 to 28, Comparative Examples 16 to 17]

)과 세로길이(

)는 각각 150mm, 120mm 로 고정하였다. 이 때 필라멘트들의 최종 굵기는 2.1 데니어가 되도록 토출량을 조정하여 최종 부직포의 중량을 20gr/㎡으로 제조하였다. Test conditions were set as in Example 4. The number of filaments introduced into the stretched pipe 160' was fixed at 320, and as shown in FIG. 8, a charging airflow interference prevention plate 200' and a high voltage generator were installed at the bottom of the nozzle 190 for testing. The material of the charged airflow interference prevention plate 200' was made of copper, and the width of the charged airflow interference prevention plate 200'

) And length (

) Was fixed to 150mm and 120mm, respectively. At this time, the discharge amount was adjusted so that the final thickness of the filaments was 2.1 denier, and the weight of the final nonwoven fabric was prepared as 20gr/m2.

Further, the test was conducted while adjusting the distance D _c2 between the nozzle 190 and the charged airflow interference prevention plate 200' and the DC supply voltage of the high voltage generator. The test was conducted in this way and the results are shown in Table 8.

Tensile strength, tear strength = MD/CD division Example 25 Example 26 Example 27 Comparative Example 16 Comparative Example 17 Example 28 Spacing (Dc ₂ ), mm 15 30 9 35 7 18 High voltage (KV) 20 20 20 20 20 24


part
Straight
artillery
water
castle Weight distribution
(CV%) 3.5 3.8 4.0 5.4


filament
Clogging
And
Discharge occurs 3.4 Reach the charge
Time in seconds 2.6 2.9 2.8 4.1 2.6 The tensile strength
(Kg/5cm) 4.8/4.6 4.3/4.5 4.3/4.4 3.8/4.1 4.4/4.7 Tensile strength ratio (MD/CD) 1.0 1.0 1.0 1.0 1.0 Tear strength
(Kgf) 0.1/0.1 0.1/0.1 0.1/0.2 0.1/0.1 0.1/0.1 Defect evaluation score 5 5 5 3 5

[Examples 13 to 16, Comparative Example 7]

This embodiment was tested by preparing configurations as in Example 12 based on what is shown in FIG. 8. A polyester chip having an intrinsic viscosity (IV) of 0.67 was melted at a spinning temperature of 296°C to prepare filaments through a spinning nozzle 190. At this time, the discharge amount was set so that the spinning speed was 5,400m/min by adjusting the pressure of the compressed air flowing into the stretching pipe 160', and the thickness of the manufactured filaments was manufactured to 9 denier.

The number of filaments introduced into the stretched pipe 160' was adjusted to 30-60, and the weight distribution of the nonwoven fabric and the tensile strength and ratio in the longitudinal and transverse directions were investigated, respectively, along with the production capacity change. In addition, the inclination angle of the spinning block 130 was fixed at 33 degrees, and the nozzle spacing (l ₀ ) was fixed at 80 mm.

In Comparative Example 18, the conventional apparatus shown in FIG. 1 was used, and the nozzle spacing (l ₀ ) was fixed to 80 mm, and the material of the collision plate 17 was lead (Pb), which is advantageous for frictional charging.

The width of the prepared nonwoven fabric was 1.0M, and the surface temperature of the calender roll for thermal bonding used in the manufacture of the nonwoven fabric was 252°C and the line pressure was fixed at 54Kg/cm. Finally, the weight of the nonwoven fabric wound around the winder 250 was 90gr/m2. Table 9 shows the experimental results.

Tensile strength, tear strength = MD/CD division Example 29 Example 30 Example 31 Example 32 Comparative Example 18 Number of filament strands
(dog) 30 40 50 60 30

part
Straight
artillery
water
castle Weight distribution
(CV%) 3.9 4.1 4.2 4.7 7.4 Reaching the electric charge
Time in seconds 3.3 3.2 3.0 3.7 7.9 The tensile strength
(Kg/5cm) 17.4/16.9 17.8/18.3 17.6/16.3 17.2/16.0 21.7/8.1 Tensile strength ratio
(MD/CD) 1.0 1.0 1.1 1.1 2.7 Tear strength
(Kgf) 1.7/2.1 2.2/2.4 2.0/2.2 2.1/2.4 1.4/2.8 Flaw evaluation
score 5 5 5 4 2

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes and additions within the spirit and scope of the present invention. And additions will be seen as falling within the scope of the claims of the present invention.

1: filament fiber bundle
110: raw material storage and supply tank
120: extrusion section
130: radiation block
140: exhaust
150: filament cooling unit
160: extension
160': stretched pipe
161: inlet
162: guide member
163: stretched pipe cover
170: Corona charging unit
171: charging electrode
172: anti-static needle
173: protective cover
174: ground electrode
180: high voltage generator
190: nozzle
200: airflow interference prevention plate
200': Daejeon airflow interference prevention plate
201: prevention plate cover
210: conveyor
220: suction unit
230: calendar roll
240: cooling roll
250: winder
260: Faraday cage
<Conventional technology>
10: crash board
20: nozzle
30: drawing pipe
40: radiation block
50: conveyor

Claims (10)

A stretching unit including a plurality of stretching pipes, and stretching the spun filaments through the plurality of stretching pipes;
A plurality of nozzles respectively connected to the plurality of stretching pipes to discharge the stretched filaments;
A conveyor collecting the filaments from the plurality of nozzles and transferring them in a first direction; And
An apparatus for manufacturing a large amount of long-fiber nonwoven fabric, comprising: a stretch pipe cover for adjusting the amount of external air introduced by adjusting the size of the suction port formed on one side of the plurality of stretch pipes.
The method of claim 1,
A device for manufacturing a large amount of long fiber nonwoven fabric, characterized in that a guide member for guiding the external air is provided at a lower portion of the position at which the inlet is formed inside the plurality of stretching pipes.
The method of claim 2,
The guide member reduces the inner diameter of the plurality of stretched pipes by the length of the hem,
The apparatus for manufacturing a large amount of long-fiber nonwoven fabric, characterized in that the inner diameter of the plurality of stretched pipes reduced by the length of the hem of the guide member is between one-fifth and one-third.
The method of claim 1,
A corona charging unit provided at an upper end or a lower end of the plurality of nozzles, introducing compressed air into the plurality of stretching pipes, and charging the filaments by attaching ions to the surfaces of the filaments to separate and diffuse the filaments; Including,
The suction port is located at a distance between 2 and 6 times the inner diameter of the plurality of elongated pipes from the upper end of the corona charging unit,
An apparatus for manufacturing a large amount of long fiber nonwoven fabric, characterized in that the area of the suction port is formed between 0.2 and 1.0 times the inner area of the plurality of stretched pipes.
A plurality of nozzles respectively connected to a plurality of drawing pipes and discharging the filaments drawn through the plurality of drawing pipes;
A corona charging unit provided on one side of the plurality of nozzles to attach ions to the surfaces of the stretched filaments;
A conveyor collecting the filaments from the plurality of nozzles and transferring them in a first direction; And
Corresponding to the plurality of nozzles, a plurality of charged air flows formed by being spaced apart from each of the plurality of nozzles by a predetermined distance, blocking the flow of air applied to the filaments, and additionally charging the filaments Including; interference prevention plate;
One of the plurality of charged airflow interference prevention plates includes at least one metal surface and is charged as a voltage is applied,
A prevention plate cover is provided around the circumference of the charged airflow interference prevention plate to insulate at least a portion of the charged airflow interference prevention plate from the outside,
The metal surface is provided facing the plurality of nozzles so that the filaments discharged from one of the plurality of nozzles directly contact, and the prevention plate cover is the metal surface facing the plurality of nozzles in the charged airflow interference prevention plate. An apparatus for manufacturing a large amount of long-fiber nonwoven fabric, characterized in that exposing only a portion of the outside.
delete The method of claim 5,
The device for manufacturing a large amount of long-fiber nonwoven fabric, characterized in that the spaced apart distance between the charging airflow interference prevention plate and the plurality of nozzles is between 0.5 to 2 times the inner diameter of the plurality of stretching pipes.
The method of claim 1 or 5,
The apparatus for manufacturing a long fiber nonwoven fabric, characterized in that the plurality of nozzles are arranged in a non-zero inclination with respect to a direction perpendicular to the first direction.
The spinning block melts the thermoplastic synthetic fibers and spins them into filament bundles of long fibers;
Stretching the spun filaments through a plurality of stretching pipes;
Discharging the filaments by a plurality of nozzles connected to each of the plurality of stretching pipes;
Collecting and arranging the filaments from the plurality of nozzles to a conveyor; And
Containing;
A method for producing a large amount of long-fiber nonwoven fabric, comprising: a stretch pipe cover for adjusting the amount of external air introduced by adjusting the size of the inlet formed at one side of the plurality of stretch pipes.
The spinning block melts the thermoplastic synthetic fibers and spins them into filament bundles of long fibers;
Stretching the spun filaments through a plurality of stretching pipes;
A corona charging unit provided on one side of the plurality of nozzles to attach ions to the surfaces of the stretched filaments;
Discharging the filaments by a plurality of nozzles connected to each of the plurality of stretching pipes;
Blocking the flow of air applied to the filaments by a charging airflow interference prevention plate, and performing additional charging on the filaments;
Collecting and arranging the filaments from the plurality of nozzles to a conveyor; And
Including; Including,
One of the plurality of charged airflow interference prevention plates includes at least one metal surface and is charged as a voltage is applied,
A prevention plate cover is provided around the circumference of the charged airflow interference prevention plate to insulate at least a portion of the charged airflow interference prevention plate from the outside,
The metal surface is provided facing the plurality of nozzles so that the filaments discharged from one of the plurality of nozzles directly contact, and the prevention plate cover is the metal surface facing the plurality of nozzles in the charged airflow interference prevention plate. Method for producing a large amount of long fiber nonwoven fabric, characterized in that exposing only a portion of the outside.

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