JP2021123805A - Non-woven fabric manufacturing equipment - Google Patents

Abstract

To provide non-woven fabric manufacturing equipment capable of suppressing broken thread due to wear of a filament assembly and controlling dispersion state of the filament assembly in a transport direction of a collection belt.SOLUTION: In non-woven fabric manufacturing equipment 100, extension means 40 includes a dispersion plate 43 having an upper end part 43a continuously connecting to an inner wall 42c on an upstream side in a transport direction C defining a discharge port 42b and a lower end part 43b curved or inclined toward the upstream side in the transport direction C, and a filament assembly 4 is released toward transport means 50 located upstream in the transport direction from the lower end part 43b of the dispersion plate 43 with the dispersion plate 43 in a non-contact state. Since the filament assembly 4 is in the non-contact state with the dispersion plate 43, it can suppress broken thread, and since the filament assembly 4 collides with the transport means 50 at an acute angle, it can control dispersion state of a filament assembly 5 in the transport direction C.SELECTED DRAWING: Figure 3

Description

The present invention relates to a non-woven fabric manufacturing apparatus including a stretching means for aerodynamically stretching a filament aggregate.

Some non-woven fabric manufacturing devices form a non-woven fabric from filaments. For example, in the spunbond manufacturing method, which is one of the manufacturing devices, a thermoplastic resin is melt-spun from a large number of spinning holes of a spinneret by a spinning means to form a filament aggregate which is a bundle of filaments. .. The filament aggregate is supplied with cooling air, which is a controlled uniform flow, from the horizontal direction by the cooling means, cooled to a desired hardness, and then pulled in the vertical direction by the stretching means. After that, the filament aggregates directly deposited on the collection belt are conveyed by the conveying means, and the filament aggregates are entangled with each other by the entanglement means to form a non-woven fabric.

In such a non-woven fabric manufacturing apparatus, when the filament aggregate is deposited on the collection belt, the filament aggregate is simply collided and deposited from a direction substantially perpendicular to the collection belt without controlling the dispersion of the filament aggregate. As a result, the non-woven fabric was uneven and the texture was reduced. Therefore, the non-woven fabric has been required to uniformly disperse the filament aggregates on the collection belt in order to improve the texture, that is, to improve the uniformity of the formation.

Here, for example, in Patent Document 1, in the spunbonded nonwoven fabric manufacturing apparatus, an inclined plate is provided at the discharge port of the ejector on the premise that the edge formed by the passage and the inclined plate is contacted and charged, and the Coanda effect is applied. Described are filament aggregates that are curved along an inclined plate. Further, in Patent Document 1 (in particular, refer to lines 2-4 in the lower right column of page 2), the contact triboelectric charge is controlled by appropriately setting the angle θ and the length l of the inclined plate. Things are listed. As a result, a desired amount of charge is applied to the filament aggregate, and a repulsive force between the filaments is generated, so that the filament aggregate is dispersed in the air and then collides with and is deposited on the collection belt.

Japanese Unexamined Patent Publication No. 52-118068

However, Patent Document 1 has the following problems. The first problem is that the edge formed by the ejector and the inclined plate is intentionally brought into contact with the filament aggregate to cause contact triboelectric charging on the filament aggregate, so that each filament is in constant contact with the edge. It was worn and there was a risk of thread breakage (hereinafter referred to as "thread breakage due to wear"). The second problem is that the charged filament aggregate is dispersed in the air by charging and then collides with the collection belt. Therefore, this collision controls the transport direction of the collection belt. There was a risk of becoming an excessively dispersed state that was not done (hereinafter referred to as "excessively dispersed state").

An object of the present invention is to provide a non-woven fabric manufacturing apparatus capable of suppressing yarn breakage due to wear of the filament aggregate and controlling the dispersed state of the filament aggregate in the transport direction of the collection belt.

In order to solve the above problems, the non-woven fabric manufacturing apparatus includes a spinning means for extruding the molten thermoplastic resin as a filament aggregate composed of filaments, a drawing means for aerically stretching the filament aggregate, and the above-mentioned A transport means for depositing filament aggregates and transporting them in a predetermined transport direction is provided, and the stretching means is continuous with a suction port, a discharge port, and an inner wall on the upstream side in the transport direction that defines the discharge port. A dispersion plate having an upper end portion connected to the above and a dispersion plate having a lower end portion curved or inclined toward the upstream side in the transport direction, the filament aggregate is in a non-contact state with the dispersion plate, and the dispersion plate is provided. It is discharged toward the transport means located on the upstream side in the transport direction from the lower end portion of the.

Further, the non-woven fabric manufacturing apparatus sets an angle between the virtual extension line of the lower end portion of the dispersion plate and the upper surface of the transport means, which is viewed from a direction orthogonal to the transport direction on the upper surface of the transport means, of 30 to 89. It may be (°).

Further, in the non-woven fabric manufacturing apparatus, the vertical line length from the lower end portion of the dispersion plate to the upper surface of the transport means may be 50 to 300 (mm).

Further, the non-woven fabric manufacturing apparatus is viewed from a direction orthogonal to the transport direction on the upper surface of the transport means, and as it goes from the upper end to the lower end of the dispersion plate, the tangential direction of the dispersion plate and the upper surface of the transport means. The angle between the two may be constant or gradually decrease.

Further, in the non-woven fabric manufacturing apparatus, the dispersion plate may have a single or a plurality of curved surface shapes, a single or a plurality of planar shapes, or a combination thereof.

Further, the non-woven fabric manufacturing apparatus may be provided so that the dispersion plate covers the lower part of the discharge port when viewed from the transport direction.

According to the present invention, it is possible to provide a non-woven fabric manufacturing apparatus capable of suppressing yarn breakage due to wear of the filament aggregate and controlling the dispersed state of the filament aggregate in the transport direction of the collection belt.

It is the schematic which shows an example of the spunbonded nonwoven fabric manufacturing apparatus which concerns on one Embodiment of this invention. It is a perspective view explaining the details of the ejector and the collection belt shown in FIG. It is a side view explaining the dispersion plate shown in FIG. 2, (a) shows the manufacturing state of the non-woven fabric, and (b) shows the non-manufacturing state of the non-woven fabric.

An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. However, the present invention is not limited to the aspects of the present embodiment.

<Non-woven fabric manufacturing equipment>
The bundle of a plurality of filaments (hereinafter referred to as "filament aggregate") 3 according to the present embodiment and the nonwoven fabric 6 containing the same can be obtained by a nonwoven fabric manufacturing apparatus by a normal composite melt spinning method without using a special apparatus. can. Among them, a non-woven fabric manufacturing apparatus by the spunbond method, which is excellent in productivity, is preferably used.

FIG. 1 shows a schematic view of a spunbonded nonwoven fabric manufacturing apparatus (hereinafter referred to as “nonwoven fabric manufacturing apparatus”) 100 as an example of the nonwoven fabric manufacturing apparatus according to the embodiment of the present invention, not for a limited purpose but for an exemplary purpose. The white arrows A, arrows B, arrows C and black arrows D in the figure are the spinning direction of the filament assembly 3, the deflection direction of the filament assembly 4, and the transport direction of the collection belt 51 (hereinafter, “MD direction”). ”) And the circumferential direction of the collection belt 51, respectively. Further, the X-axis direction in the drawing indicates the transport direction C (MD direction), and the Y-axis direction is a direction orthogonal to the MD direction of the collection belt 51 (hereinafter, also referred to as “CD direction”). The Z-axis direction indicates a direction orthogonal to the X-axis direction and the Y-axis direction and parallel to the spinning direction A.

The non-woven fabric manufacturing apparatus 100 includes a first extruder 11 and a second extruder 12 (spinning means), a spinneret (spinning means) 20, a cooling blower (cooling means) 30, and an ejector (stretching means) 40. It is composed of a collecting conveyor (transporting means) 50, a heat embossing roll 60, and a winder 70. The outlines thereof will be described in order below.

The first extruder 11 melts the first raw material resin 1 and sends a predetermined flow rate of the melt to the spinneret 20 by the rotation of the spiral first rotor 13. Similarly, the second extruder 12 melts the second raw material resin 2 and sends the melt at a predetermined flow rate to the spinneret 20 by the rotation of the spiral second rotor 14.

(First raw material resin)
The first raw material resin 1 contains a thermoplastic resin as a main component. That is, the first raw material resin 1 can contain a thermoplastic resin in an amount of 90% by mass or more and 100% by mass or less based on the total solid content of the first raw material resin 1. As the thermoplastic resin applicable to the first raw material resin 1, polyolefin-based resins such as polypropylene (PP) and polyethylene (PE) are chemically stable and highly safe, and thus are used as sanitary materials. It is preferably used. From the viewpoint of spinnability of filaments made of composite fibers, polypropylene (PP) is more preferably used as the thermoplastic resin.

(Second raw material resin)
The second raw material resin 2 contains a thermoplastic resin as a main component. Specifically, the second raw material resin 2 contains a thermoplastic resin in an amount of 90% by mass or more and 100% by mass or less based on the total solid content of the second raw material resin 2.

Examples of the thermoplastic resin applicable to the main component of the second raw material resin 2 include polyolefin resins such as polypropylene (PP) and polyethylene (PE). One type of thermoplastic resin may be used, or two or more types may be used in combination. From the viewpoint of texture such as the feel of a filament made of a composite fiber, polyethylene (PE) can be preferably used as the thermoplastic resin.

(Additive)
In the filament made of the composite fiber, in each of the first raw material resin 1 and the second raw material resin 2, in addition to the thermoplastic resin, additives are contained as necessary within a range that does not impair the object of the present invention. You may. In order to exert the necessary functions while ensuring safety, the additive is preferably 1% by mass or less based on the total solid content of the first raw material resin 1 and the second raw material resin 2. ..

Examples of raw materials for additives include various stabilizers such as known heat-resistant stabilizers and weather-resistant stabilizers, antistatic agents, slip agents, anti-blocking agents, antifogging agents, lubricants, dyes, pigments, natural oils, and synthetic oils. Examples include oil and wax.

Stabilizers include, for example, anti-aging agents such as 2,6-di-t-butyl-4-methylphenol (BHT); tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxy). Phenyl) propionate] methane, β- (3,5-di-t-butyl-4-hydroxyphenyl) propionic acid alkyl ester, 2,2'-oxamidbis [ethyl-3- (3,5-di-t-butyl) Phenolic antioxidants such as -4-hydroxyphenyl) propionate; fatty acid metal salts such as zinc stearate, calcium stearate, calcium 1,2-hydroxystearate; glycerin monostearate, glycerin disstearate, pentaerythritol monostearate , Pentaerythritol distearate, polyhydric alcohol fatty acid esters such as pentaerythritol tristearate, and the like. Moreover, these can also be used in combination.

Examples of the lubricant include oleic acid amide, erucic acid amide, stearic acid amide and the like.

Also, silica, diatomaceous soil, alumina, titanium oxide, magnesium oxide, pebbles powder, pebbles balloon, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, barium sulfate, calcium sulfite, It may contain a filler such as talc, clay, mica, asbestos, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, and molybdenum sulfide.

The spinneret 20 has a plurality of composite spinnery nozzles (not shown) configured to form and eject the desired fiber structure. From this nozzle, a filament aggregate 3 made of composite fibers in which melts from the first extruder 11 and the second extruder 12 are combined is spun in the direction of gravity.

The cooling blower 30 is an open type, and blows cooling air 31 to the spun filament aggregate 3 from the X-axis direction, which is a direction orthogonal to the spun direction A, to cool the filament aggregate 3. .. Further, since the high-temperature separated gas 32 exhausted from the filament aggregate 3 is exhausted above the cooling blower 30 without following the spinning direction A, the filament aggregate 3 is efficiently cooled. Can be done.

The ejector (stretching means) 40 is an open type and includes a body 42 having a suction port 42a and a discharge port 42b, and a dispersion plate 43 provided on the upstream side of the transport direction C at the periphery of the discharge port 42b. A low-pressure portion is generated in the body 42 by injecting the ejector high-pressure air 41a, which is a driving fluid, with a component in the spinning direction A in the body 42. The filament aggregate 3 is sucked into the body 42 from the suction port 42a by the generated low pressure portion, and is discharged to the outside from the discharge port 42b together with the discharge air 41b which is the driving fluid whose pressure is recovered. Although details will be described later, the discharge air 41b flows along the dispersion plate 43 due to the Coanda effect of the dispersion plate 43 provided at the discharge port 42b of the body 42. As a result, the filament aggregate 4 discharged from the ejector 40 is stretched while being deflected from the spinning direction A to the deflection direction B and toward the upstream side of the transport direction C.

The collection conveyor 50 includes a collection belt 51, first to fourth rolls 55 to 58 hung around the apex of the inverted trapezoidal orbit of the collection belt 51, and a collection belt 51 in the upper orbit. A suction box 59, which is arranged to face the lower part of the above, is provided. The collection belt 51 moves clockwise in the orbital direction D with at least one drive rotation of the first to fourth rolls 55 to 58. The filament aggregate 4 stretched by the ejector 40 is directly deposited on the collection belt 51 of the collection conveyor 50 to a predetermined thickness, and is also conveyed to the thermal emboss roll 60 in the transfer direction C.

The thermal embossing roll 60 includes a pair of cylindrical rolls having an uneven cylindrical surface heated to a predetermined temperature and a flat cylindrical surface. The pair of cylindrical rolls squeeze the deposited filament aggregate 5 and entangle a part of the filament aggregate 5 by pressure and heat to form the non-woven fabric 6. This entanglement treatment is also called a thermal embossing method, and the non-woven fabric 6 obtained by this method has an embossed pattern appearing on the surface.

In addition to the thermal embossing method, the non-woven fabric 6 according to the present embodiment employs a method using means such as needle punching, water jet, ultrasonic waves, or a method of heat-sealing by hot air through as a method of fiber entanglement treatment. can do. The needle punching means is a method in which a needle is inserted into a filament assembly 5 and entangled. The water jet means is a method of injecting high-pressure water onto the filament aggregate 5 to entangle them. The ultrasonic means is a method of melting and entwining a part of filaments by using ultrasonic waves. The hot air through is a method in which hot air is blown to the filament aggregate 5 to melt and entangle a part of the filaments.

(Non-woven fabric)
The non-woven fabric 6 according to the present embodiment is composed of a filament aggregate 5, and may have a single-layer structure composed of one layer, or may have a multi-layer structure composed of a plurality of layers.

The winder 70 winds the continuous non-woven fabric 6 with a predetermined winding hardness without causing wrinkles.

<Details of ejector and collection belt>
FIG. 2 is a perspective view for explaining the details of the ejector 40 and the collection belt 51 shown in FIG. 1, and FIG. 3 is a side view for explaining the dispersion plate shown in FIG. Here, the black arrow E in FIG. 2 represents the suction direction of the suction box 59. Further, (I) to (IV) in FIG. 3 (a) represent the deposition process of the filament aggregates 4 and 5 in order.

(Details of ejector)
The ejector (stretching means) 40 includes a body 42 and a dispersion plate 43. The body 42 has a suction port 42a, a discharge port 42b, and an inner wall 42c (see FIG. 3) that communicates the suction port 42a and the discharge port 42b. Further, the dispersion plate 43 is provided on the upstream side of the transport direction C at the peripheral edge of the discharge port 42b of the body 42, and is continuously connected to the inner wall 42c on the upstream side of the transport direction C defining the discharge port 42b. It has a lower end portion 43b that is curved or inclined toward the upstream side in the transport direction (see FIG. 3A).

The dispersion plate 43 in this embodiment is used to utilize the Coanda effect. Here, the Coanda effect is a phenomenon in which the jet flow draws in the surrounding fluid due to the viscous effect, and when the dispersion plate 43 is on one side of the discharge air 41b which is the jet flow as in the present embodiment, the surrounding fluid Instead of, the discharge air 41b itself is drawn toward the dispersion plate 43, so that the discharge air 41b flows along the dispersion plate 43. Due to this Coanda effect, the filament aggregate 4 is stretched together with the discharge air 41b in a non-contact state with the dispersion plate 43 while being deflected from the spinning direction A to the deflection direction B toward the upstream side of the transport direction C. .. Therefore, the non-woven fabric manufacturing apparatus 100 in the present embodiment has the effect of suppressing thread breakage due to wear of the filament aggregate 4, that is, because the filament aggregate 4 and the dispersion plate 43 do not come into contact with each other. The first problem (thread breakage due to wear) in Patent Document 1 described above can be solved.

In the dispersion plate 43 of the present embodiment, in order for the Coanda effect to work more strongly, it is preferable that the inner wall 42c on the upstream side in the transport direction C and the upper end portion 43a are smoothly and continuously connected. Further, in the present embodiment, the dispersion plate 43 has the same shape as viewed from the direction (CD direction) orthogonal to the transport direction C on the upper surface of the collection belt 51, and this shape is formed from the upper end portion 43a to the lower end portion. It is preferable that the angle formed by the tangential direction of the dispersion plate 43 and the collection belt 51 becomes constant or gradually decreases toward 43b. As a specific shape of the dispersion plate 43, one that is continuously or stepwise curved or inclined from the upper end portion 43a to the lower end portion 43b, that is, a single or a plurality of curved surface shapes, a single or a plurality of flat surfaces. A shape or a combination thereof is preferable. Further, in order to uniformly exert the Coanda effect in the extending direction (Y-axis direction) of the discharge port 42b of the present embodiment, the dispersion plate 43 is placed on the Y-axis so as to cover the lower side of the discharge port 42b when viewed from the transport direction C. It is preferable to extend it in the direction.

(Details of collection belt)
The collection belt 51 of the upper orbital orbit has a collision region α in which the filament aggregates 4 deflected by the dispersion plate 43 collide with each other, and a part of the collided filament aggregates 4 is dispersed toward the upstream side in the transport direction C. It is roughly divided into a region β and a transport region γ to which the deposited filament aggregate 5 is transported. In the following, the deposition process of the filament aggregates 4 and 5 in each region will be sequentially described with reference to (I) to (IV) in FIG. 3 (a).

In the collision region α in (I), the filament aggregate 4 deflected toward the upstream side in the transport direction C on the collection belt 51 collides with the collection belt 51. At this time, a part of the colliding filament aggregate 4 is dispersed to the upstream side in the transport direction C, and the other part of the filament aggregate 4 is deposited on the collection belt 51. Here, since the deflected filament aggregate 4 moves in a direction opposite to that of the collection belt 51, the collision energy received by the filament aggregate 4 is relatively high, so that the filament aggregate 4 is conveyed in the transport direction. It can be positively dispersed to the upstream side of C.

In the dispersion region β in (II), a part of the filament aggregate 4 dispersed upstream in the transport direction C is the weight of the filament aggregate 4, the suction by the suction box 59 in the suction direction E, and the filament assembly. Kinetic energy is lost due to frictional force between the body 4 and the collection belt 51. As a result, a part of the filament aggregate 4 can be deposited in a dispersed state controlled in the X-axis direction (transportation direction C).

In the collision region α in (III), the other part of the filament aggregate 4 deposited on the collection belt 51 in (I) is laminated on the filament aggregate 5 deposited in (II). As a result, the filament aggregate 5 can be deposited in a dispersed state controlled in the Z-axis direction (stacking direction).

In the transport region γ in (IV), the filament aggregate 5 in the dispersed state controlled in the X-axis direction (transport direction C) and the Z-axis direction (stacking direction) is transported in (II) and (III). NS.

Here, in (I), it is assumed that the ratio of a part of the filament aggregate 4 dispersed in the dispersion region β and the other part of the filament aggregate 4 deposited in the collision region α is controlled. As shown in 3 (b), the collision angle between the deflected filament aggregate 4 and the collection belt 51 (see θ in FIG. 3B) and the filament aggregate 4 emitted from the ejector 40 and the capture. The distance from the collecting belt 51 (see L in FIG. 3B) and the like are important parameters. Therefore, the non-woven fabric manufacturing apparatus 100 in the present embodiment has the effect of controlling the dispersion state of the filament aggregate 5 at least in the transport direction C, that is, the second problem (excessive dispersion) in Patent Document 1 described above. The state) can be resolved.

<Collision angle between the deflected filament aggregate and the collection belt>
The deflected filament aggregate 4 is stretched along a virtual extension line of the lower end portion 43b of the dispersion plate 43 and collides with the collection belt 51. Therefore, as shown in FIG. 3B, the collision angle between the deflected filament aggregate and the collection belt is dispersed as viewed from the direction (CD direction) orthogonal to the transport direction C on the upper surface of the collection belt 51. It is defined as the angle θ formed by the virtual extension line of the lower end portion 43b of the plate 43 and the upper surface of the collection belt 51. Here, although the details will be described later, the width Wα of the collision region α can be appropriately controlled by setting the collision angle θ within a predetermined numerical range. As a result, the deflected filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state (appropriate dispersion region β width Wβ).

<About the distance between the filament aggregate emitted from the ejector and the collection belt>
At the lower end 43b of the dispersion plate 43, the filament aggregate 4 is discharged from the ejector 40. Therefore, the distance between the filament aggregate 4 discharged from the ejector 40 and the collection belt 51 is the perpendicular length from the lower end 43b of the dispersion plate 43 to the upper surface of the collection belt 51, as shown in FIG. 3 (b). Defined as L. Here, although the details will be described later, the collision energy received by the filament aggregate 4 can be appropriately controlled by setting the distance L between the filament aggregate 4 and the collection belt 51 within a predetermined numerical range. As a result, the deflected filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state (appropriate dispersion region β width Wβ).

<Comparative evaluation of dispersion means and collection belt area>
In each region of the dispersion means and the collection belt 51 according to each of Examples 1 to 9 of the present invention, seven parameters related to physical properties were comparatively evaluated with respect to Comparative Example 1. This comparative evaluation is shown in Table 1 below. Here, as a common condition in the comparative evaluation, the material of the filament aggregate 4 is polypropylene resin. Further, the transport speed of the collection belt 51 was constant (200 (m / min)). Further, the suction pressure on the collection belt 51 was set to a constant value (-130 (Pa)).

<Evaluation of thread breakage difficulty>
When the filament breaks, it appears as a lumpy filament in the non-woven fabric 5. Therefore, the difficulty of thread breakage is evaluated by using a defect detector (SmartView automatic defect inspection system manufactured by COGNEX), and the number of lumpy (convex) filaments per ^{1 m 2 of the area of the non-woven fabric 5, that is, the number of defects.} If the number of defects is 3 or more, the thread breakage is likely to occur, so "x". If the number is 2, the thread breakage is small, so "△". If the number is 1, the thread breakage occurs. Since there is almost no occurrence of thread breakage, it is evaluated as "○", and if it is 0, it is evaluated as "◎" because there is no occurrence of thread breakage.

<Evaluation of geological uniformity>
The non-woven fabric has unevenness due to variations in filament thickness and the like. Therefore, for the evaluation of the uniformity of the formation, the light transmission image of the non-woven fabric 5 is acquired by using the total formation (FMT-MIII formation evaluation system manufactured by Nomura Shoji Co., Ltd.), and the formation index (variable coefficient of absorbance) is obtained. The smaller the value, the better the formation), and if the average value is 200 or more, it is "x", if the average value is 185 or more and less than 200, it is "△", and if the average value is 170 or more and less than 185. If there is, it is evaluated as "○", and if the average value is less than 170, it is evaluated as "◎".

<Types of dispersion means>
As the type of the dispersion means, a dispersion plate that disperses the filament aggregate 4 in a non-contact state by the Coanda effect, or a reflector that disperses the filament aggregate 4 by directly contacting the filament aggregate 4 is used. Here, the upper ends of the dispersion plate and the reflector are arranged at the discharge port 42b on the upstream side in the transport direction C. Further, the lower end of the dispersion plate is arranged so as to be inclined toward the upstream side in the transport direction, while the lower end of the reflector is located on the downstream side in the transport direction so as to overlap the discharge port 42b when viewed from the Z-axis direction. Place it at an angle toward. The type of this dispersion means is a parameter that affects "difficulty of thread breakage".

In the present embodiment, it is preferable that the dispersion plate 43 is adopted as the dispersion means. Here, if the dispersion plate 43 is adopted, the filament aggregate 4 can be dispersed on the collection belt in a non-contact state. As a result, the filament aggregate 4 collides with the dispersing means, the thread breakage due to wear is suppressed, and the "evaluation of the difficulty of thread breakage" can be improved.

<About the angle θ (°) formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt>
The angle θ (°) formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt is a direction orthogonal to the transport direction C on the upper surface of the collection belt 51 as shown in FIG. 3 (b). The collision angle between the filament aggregate 4 and the collection belt 51 as viewed from the CD direction) is shown. The collision angle θ (°) between the filament aggregate 4 and the collection belt 51 is approximately inversely proportional to the “width Wα of the collision region α” and is a parameter that affects the “evaluation of geological uniformity”. be.

<About the vertical line length L (mm) from the lower end of the dispersion means to the upper surface of the transport means>
As shown in FIG. 3B, the perpendicular length L (mm) from the lower end of the dispersion means to the upper surface of the transport means is the lower end 43b of the dispersion plate 43, that is, the filament aggregate discharged from the ejector 40. The distance between 4 and the collection belt 51 is shown. The distance L (mm) between the filament aggregate 4 emitted from the ejector 40 and the collection belt 51 is approximately inversely proportional to the “width Wβ of the dispersion region β” and is used for “evaluation of geological uniformity”. It is a parameter that affects.

<About the width Wα (mm) of the collision area α>
As shown in FIG. 3A, the width Wα (mm) of the collision region α indicates the width of the transport direction C in which the deflected filament aggregate 4 and the collection belt 51 collide with each other. The width Wα (mm) of the collision region α is a parameter that affects the “evaluation of the uniformity of the formation”.

<About the width Wβ (mm) of the dispersion region β>
As shown in FIG. 3A, the width Wβ (mm) of the dispersion region β is dispersed and deposited on the collection belt 51 on the upstream side due to the collision between the filament aggregate 4 and the collection belt 51. The width of the transport direction C is shown. The width Wβ (mm) of the dispersion region β is a parameter that affects the “evaluation of the uniformity of the formation”.

The angle θ (see Table 1) formed by the virtual extension line at the lower end of the dispersion means of the present embodiment and the upper surface of the collection belt is preferably 30 to 89 (°). Here, if the angle θ formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt is 30 (°) or more, the collision angle θ between the filament aggregate 4 and the collection belt 51 becomes shallow. That is, it is possible to prevent the "width Wα of the collision region α" that disperses the filament aggregate 4 on the upstream side of the transport direction C from becoming extremely wide. As a result, the filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state, and the "evaluation of the uniformity of the formation" can be improved. On the other hand, if the angle θ formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt is 89 (°) or less, the collision angle θ between the filament aggregate 4 and the collection belt 51 becomes deep. That is, it is possible to prevent the "width Wα of the collision region α" that disperses the filament aggregate 4 on the upstream side of the transport direction C from becoming extremely narrow. As a result, the filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state, and the "evaluation of the uniformity of the formation" can be improved.

The perpendicular length L (mm) (see Table 1) from the lower end of the dispersion means of the present embodiment to the upper surface of the collection belt is preferably 50 to 300 (mm). Here, if the perpendicular length L from the lower end of the dispersion means to the upper surface of the collection belt is 50 (mm) or more, the collision energy received by the filament aggregate 4 is suppressed from becoming extremely large, that is, , It is possible to prevent the "width Wβ of the dispersion region β" from becoming extremely wide. As a result, the filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state, and the "evaluation of the uniformity of the formation" can be improved. On the other hand, when the perpendicular length L from the lower end of the dispersion means to the upper surface of the collection belt is 300 (mm) or less, it is possible to suppress the collision energy received by the filament aggregate 4 from becoming extremely small, that is, to prevent it from becoming extremely small. It is possible to prevent the "width Wβ of the dispersion region β" from becoming extremely narrow. As a result, the filament aggregate 4 can be deposited in the dispersed region β on the upstream side of the transport direction C in a controlled dispersed state, and the "evaluation of the uniformity of the formation" can be improved.

<Results of comparative evaluation of the area of the dispersion means and the collection belt>
As is clear from the comparison of the evaluations of Examples 1 to 9, it was concluded that the "evaluation of the difficulty of thread breakage" can be enhanced to "◎" by adopting the dispersion plate as the dispersion means. rice field. Therefore, the non-woven fabric manufacturing apparatus 100 in the present embodiment has the effect of suppressing thread breakage due to wear of the filament aggregate 4, that is, because the filament aggregate 4 and the dispersion plate 43 do not come into contact with each other. The first problem (thread breakage due to wear) in Patent Document 1 described above can be solved.

Here, the angle θ formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt is 30 to 89 (°), or the perpendicular length L from the lower end of the dispersion means to the upper surface of the collection belt. When is 50 to 300 (mm), the “evaluation of the uniformity of the formation” is “◯” or more, which can be further enhanced (see Examples 1 to 5). Further, the angle θ (°) formed by the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt and the vertical line length L (mm) from the lower end of the dispersion means to the upper surface of the collection belt are preferable numerical values. If the value is from the median value of the range, the "evaluation of the uniformity of the formation" becomes "◎", which can be further enhanced (see Example 1). Therefore, the non-woven fabric manufacturing apparatus 100 in the present embodiment has the effect of controlling the dispersion state of the filament aggregate 5 at least in the transport direction C, that is, the second problem (excessive dispersion) in Patent Document 1 described above. The state) can be resolved.

On the other hand, in Comparative Example 1, by adopting the reflector as the dispersion means, the "evaluation of the difficulty of thread breakage" becomes "x", which is lowered. At this time, since there are many thread breaks, the embossing is not uniform and sufficient, and the non-woven fabric cannot be produced. Therefore, in Comparative Example 1, the "evaluation of the uniformity of the formation" cannot be evaluated.

<Others>
The present invention is not limited to the above-described embodiments, examples, and modifications described therein, and can be appropriately modified or modified without departing from the technical idea of the present invention.

1 First raw material resin 2 Second raw material resin 3 Filament aggregate (stretched state)
4 Filament aggregate (deflection state)
5 Filament aggregate (conveyed state)
6 Non-woven fabric 11 First extruder 12 Second extruder 20 Spinning cap 30 Cooling blower 40 Ejector 41a High-pressure air for ejector 41b Discharge air 42 Body 42a Suction port 42b Discharge port 42c Inner wall 43 Dispersion plate 43a Upper end 43b Lower end 50 Collection conveyor 59 Suction box 100 Spun-bonded non-woven fabric manufacturing equipment L Length of perpendicular line from the lower end of the dispersion means to the upper surface of the collection belt Wα Width of collision area Wβ Width of dispersion area α Collision area β Dispersion area γ Transport area θ The angle between the virtual extension line at the lower end of the dispersion means and the upper surface of the collection belt.

Claims (6)

A spinning means that extrudes a molten thermoplastic resin as a filament aggregate composed of filaments,
A stretching means for aerodynamically stretching the filament aggregate, and
A transport means for depositing the filament aggregates and transporting them in a predetermined transport direction,
With
The stretching means is curved or inclined toward the suction port, the discharge port, the upper end portion that continuously connects the discharge port and the inner wall on the upstream side in the transport direction that defines the discharge port, and the upstream side in the transport direction. With a dispersion plate having a lower end portion,
An apparatus for producing a non-woven fabric, wherein the filament aggregate is discharged from a lower end portion of the dispersion plate toward the transport means located on the upstream side in the transport direction in a non-contact state with the dispersion plate. The angle between the virtual extension line of the lower end of the dispersion plate and the upper surface of the transport means when viewed from the direction orthogonal to the transport direction on the upper surface of the transport means is 30 to 89 (°). The non-woven fabric manufacturing apparatus according to claim 1. The non-woven fabric manufacturing apparatus according to claim 1 or 2, wherein the length of the perpendicular line from the lower end of the dispersion plate to the upper surface of the transport means is 50 to 300 (mm). When viewed from a direction orthogonal to the transport direction on the upper surface of the transport means, the angle formed by the tangential direction of the dispersion plate and the upper surface of the transport means becomes constant as the dispersion plate is directed from the upper end to the lower end. The non-woven fabric manufacturing apparatus according to any one of claims 1 to 3, wherein the amount is gradually reduced. The non-woven fabric manufacturing apparatus according to any one of claims 1 to 4, wherein the dispersion plate is composed of a single or a plurality of curved surface shapes, a single or a plurality of planar shapes, or a combination thereof. .. The non-woven fabric manufacturing apparatus according to any one of claims 1 to 5, wherein the dispersion plate is provided so as to cover the lower part of the discharge port when viewed from the transport direction.

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