JP2017160553A - Apparatus for manufacturing filament three-dimensional conjugate and filament three-dimensional conjugate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a surface hardness without impairing a repelling force and a surface smoothness of a filament three-dimensional conjugate.SOLUTION: An apparatus for manufacturing a filament three-dimensional conjugate comprises a molten filament feeder that ejects a plurality of molten filaments from a nozzle part and an apparatus for forming a three-dimensional conjugate that forms a filament three-dimensional conjugate in which molten filaments are mutually molten and combined. The nozzle part is provided with a nozzle group comprising first nozzles and second nozzles having an opening cross sectional area smaller than that of the first nozzles. In a predetermined direction on a cross section of the nozzle part that crosses an ejection direction of molten filaments, the first nozzles are provided more at a center portion than at an end portion of the cross section and the second nozzles are provided more at the end portion than at the center portion.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a filament three-dimensional bonded body and an apparatus for manufacturing the same.

  As a cushion material used for mattresses, pillows and the like, a filament three-dimensional bonded body obtained by partially fusing a plurality of thermoplastic resin fibers (molten filaments) in a molten state has recently attracted attention.

  For example, in Patent Document 1, when melted filaments made of a molten thermoplastic resin extruded from a plurality of nozzles are three-dimensionally bonded to each other in a three-dimensional manner, a predetermined inclination is provided so as to be inclined downward toward the center portion. A plurality of molten filaments are lowered on a pair of plate members arranged with a gap therebetween. By doing so, a three-dimensional filament combined body in which the surfaces of both end portions in the thickness direction of the mattress are smooth is formed.

JP 2013-57158 A

  However, in the mattress manufactured in Patent Document 1, since the filament density near the surfaces at both ends in the thickness direction of the mattress is increased, a hard surface layer is formed on the mattress surface. Therefore, when the user sleeps as shown in FIG. 13, the mattress is deformed into a V shape with the ground contact point of the user's body as a vertex. Therefore, the subject that the soft sleeping comfort fitted to the shape of the body was impaired occurred.

  On the other hand, in order to suppress the hardening of the surface layer of the mattress, if the pitch of the nozzle for discharging the filament to the surface layer is increased and the filament density in the vicinity of the surface of the mattress is lowered, the surface layer has more voids. There was a problem that the smoothness of the surface was impaired, such as the formation of a relatively large hole of 2 cm.

  In view of the above problems, the present invention provides an apparatus for manufacturing a filament three-dimensional assembly that can reduce the surface hardness without impairing the repulsive force and surface smoothness of the filament three-dimensional combination, and thereby It aims at providing the filament three-dimensional coupling body obtained.

  In order to achieve the above object, a filament three-dimensionally bonded body manufacturing apparatus according to an aspect of the present invention includes a molten filament supply device that discharges a plurality of molten filaments from a nozzle portion, and a filament 3 in which the molten filaments are fusion bonded. A nozzle group including a first nozzle and a second nozzle having an opening cross-sectional area smaller than that of the first nozzle. In a predetermined direction on the cross section of the nozzle portion that intersects the discharge direction of the molten filament, the first nozzle is provided more in the center than the end of the cross section, and the second nozzle is more than the center. It is set as the structure provided in many at the said edge part.

  According to this configuration, a relatively thick molten filament is discharged from the first nozzle, and a relatively thin molten filament is discharged from the second nozzle. Then, when the melted filaments are fused and bonded to form a filament three-dimensional combination, in a central region in a predetermined direction (for example, the thickness direction) on the cross section that intersects the forming direction of the filament three-dimensional combination The relatively thick melt filament is more. In addition, in the region of the end portion (that is, the surface layer) in the predetermined direction, the number of relatively thin filaments increases.

  Accordingly, it is possible to suppress a decrease in the repulsive force of the filament three-dimensional bonded body, and it is possible to suppress the surface layer from becoming excessively hard without reducing the smoothness of the surface. Therefore, the hardness of the surface can be reduced without impairing the repulsive force and the smoothness of the surface of the filament three-dimensional combination.

  In the filament three-dimensional assembly manufacturing apparatus, the nozzle group may be provided in a region having a longitudinal direction and a short direction on the cross section, and the predetermined direction may be the short direction. .

  According to this configuration, it is possible to form a filament three-dimensional combination in which a cross section perpendicular to the discharge direction of the molten filament has a shape having a longitudinal direction and a short direction. Furthermore, a large number of first nozzles are provided at the center in the short direction of the region where the nozzle group is provided, and a large number of second nozzles are provided at the end in the short direction. Therefore, a relatively thick molten filament increases in the center in the thickness direction of the filament three-dimensional combination. In addition, relatively thin filaments increase in the end portion (that is, the surface layer) in the thickness direction. Accordingly, the surface hardness can be reduced without impairing the repulsive force and the surface smoothness, particularly in the thickness direction of the filament three-dimensional combination.

  In the filament three-dimensional assembly manufacturing apparatus, the opening shape of the first nozzle is a shape having a major axis and a minor axis on the cross section, and the minor axis is an opening of the first nozzle in the lateral direction. The structure which is an internal diameter of a shape may be sufficient.

  According to this structure, the cross section of the relatively thick filament discharged from the first nozzle can be formed into a flat shape having a major axis and a minor axis. Furthermore, when a relatively thick flat filament is discharged, it becomes easy to wave in a predetermined direction (for example, the thickness direction) on the cross section of the filament three-dimensional combination. Therefore, the repulsive force (hardness) of the filament three-dimensional combination in a predetermined direction can be easily stabilized.

  The filament three-dimensional assembly manufacturing apparatus may have a configuration in which the ratio of the major axis to the minor axis of the opening shape of the first nozzle is 2 or more and 10 or less.

  According to this structure, the freedom degree of the wave direction (amplitude direction) of the relatively thick flat filament discharged from the 1st nozzle can be adjusted moderately. In other words, it is possible to prevent the wave direction from being too varied in a direction other than a predetermined direction on the cross section (for example, the short direction of the region on the cross section) or aligned in the short direction. Accordingly, it is possible to suppress a decrease in bonding (linking) with other filaments adjacent in a direction other than the predetermined direction, and to suppress a decrease in local repulsive force.

  In the filament three-dimensional assembly manufacturing apparatus, the opening shape of the second nozzle is a shape having a long diameter and a short diameter on the cross section, and the short diameter is an opening shape of the second nozzle in the longitudinal direction. The inside diameter may be a configuration.

  According to this structure, the cross section of the relatively thin filament discharged from the second nozzle can be formed into a flat shape having a major axis and a minor axis. Furthermore, when a relatively thin flat filament is discharged, it becomes easy to wave in the longitudinal direction of the region where the nozzle group is provided (for example, the width direction of the filament three-dimensional combination). Therefore, the bonding (linking) with other filaments (particularly relatively thick filaments) can be promoted, and the bonding strength between the filaments can be improved.

  In the above-described filament three-dimensional assembly manufacturing apparatus, the nozzle group further includes a third nozzle having an opening cross-sectional area smaller than that of the first nozzle, and the third nozzle is disposed at a central portion of the cross section in the predetermined direction. The structure provided may be sufficient.

  According to this configuration, a relatively thin filament is present in a central region in a predetermined direction (for example, the thickness direction) on a cross section that intersects the forming direction of the filament three-dimensional combination. Can be combined. Therefore, the bond point density per unit volume (linking density) in the central portion can be increased, and a stable repulsive force can be obtained. Therefore, for example, it is possible to reduce a decrease in local repulsion force that occurs in a portion having a low bonding point density.

  In the filament three-dimensional assembly manufacturing apparatus, in the cross section, the opening shape of the third nozzle is a shape having a long diameter and a short diameter, and the short diameter is an opening shape of the third nozzle in the longitudinal direction. The inside diameter may be a configuration.

  According to this configuration, a relatively thin flat filament can be discharged from the third nozzle. Furthermore, the wave of this flat filament can promote the coupling | bonding (linking) with another filament (especially relatively thick filament), and can improve the joint strength between filaments.

  In the filament three-dimensional assembly manufacturing apparatus, in the predetermined direction, the first nozzle is provided more in the center than the both ends of the cross section, and the second nozzle is more in the both ends than the center. The structure provided may be sufficient.

  According to this configuration, it is possible to reduce the hardness of both surfaces by increasing the number of relatively thin filaments at both ends (both the front side and the back side) in the predetermined direction.

  In order to achieve the above object, the filament three-dimensional combination according to one aspect of the present invention is a filament three-dimensional combination in which a plurality of filaments are three-dimensionally fused and bonded, A filament and a second filament that is thinner than the first filament, and the volume ratio of the second filament to the first filament at the end in the thickness direction of the filament three-dimensionally coupled is the central portion It is set as the structure larger than the said volume ratio.

  According to this configuration, the thicker filaments are relatively thicker in the central region in the thickness direction of the filament three-dimensional combination, and the end region (that is, the surface layer) in the thickness direction is relatively thicker. The number of fine filaments increases. Accordingly, it is possible to suppress a decrease in the repulsive force of the filament three-dimensional bonded body, and it is possible to suppress the surface layer from becoming excessively hard without reducing the smoothness of the surface. That is, the surface hardness can be reduced without impairing the repulsive force and the smoothness of the surface of the filament three-dimensional combination.

  Further, when the filament three-dimensional bonded body is used for, for example, a mattress, a soft sleeping comfort that fits the shape of the body can be obtained along with a repulsive force that is easy to turn over.

  According to the present invention, the hardness of the surface can be reduced without impairing the repulsive force and the smoothness of the surface of the filament three-dimensional bonded body.

It is a conceptual diagram which shows an example of a filament three-dimensional conjugate | bonded_body manufacturing apparatus. It is an A-A 'cross-sectional arrow figure of the filament three-dimensional conjugate | bonded_body manufacturing apparatus shown in FIG. It is a block diagram which shows the structural example of the filament three-dimensional conjugate | bonded_body manufacturing apparatus shown in FIG. It is an enlarged view of a pair of slat conveyor. It is a horizontal sectional view about the nozzle part concerning a 1st embodiment. It is an example of the shape of the horizontal cross section of the opening part of the 1st nozzle which concerns on 1st Embodiment. It is a conceptual diagram at the time of using a filament three-dimensional coupling body as a mattress. It is a horizontal sectional view about the nozzle part concerning a 2nd embodiment. It is an example of the shape of the horizontal cross section of the opening part of the 1st nozzle which concerns on 2nd Embodiment. It is a horizontal sectional view about the nozzle part concerning a 3rd embodiment. It is a conceptual diagram which shows the preferential vibration direction (wave direction) of the molten filament discharged | emitted from the nozzle group which consists of a flat-shaped nozzle. It is a conceptual diagram which shows the wave direction of a thick filament and a thin filament in a filament three-dimensional coupling body. It is a conceptual diagram at the time of using the conventional filament three-dimensional coupling body as a mattress.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the unit of length or area may be indicated by adding [] such as [mm] for easy viewing.

<First Embodiment>
FIG. 1 is a configuration diagram illustrating an example of a filament three-dimensional joined body manufacturing apparatus 1. FIG. 2 is a cross-sectional view taken along the line AA ′ of the filament three-dimensional assembly manufacturing apparatus 1 shown in FIG. FIG. 3 is a block diagram illustrating a configuration example of the filament three-dimensional joined body manufacturing apparatus 1 illustrated in FIG. 1.

  In FIG. 1, a filament three-dimensional joined body manufacturing apparatus 1 is an apparatus for manufacturing a filament three-dimensional joined body 3 made of thermoplastic resin fibers having a three-dimensional network structure, and includes an extruder 10 and a three-dimensional joined body. A forming apparatus 20 and a controller (not shown) for controlling each component of the filament three-dimensional joined body manufacturing apparatus 1 are provided. Hereinafter, the thermoplastic resin fiber is referred to as a filament 2 and the filament three-dimensional combination 3 is referred to as an FTS (Filament-linked Three-dimensional Structure) 3. The filament three-dimensional joined body manufacturing apparatus 1 is referred to as an FTS manufacturing apparatus 1.

  The extrusion molding machine 10 is an example of a molten filament supply device that forms a filament 2 in a molten state and discharges (supplies) the filament 2 to a three-dimensional joined body forming device 20. The extrusion molding machine 10 includes an extruder 11 that is a pressure-melting section having a hopper 13 for charging materials, a die 12 having a nozzle section 17 connected to the extruder 11, and the nozzle section. The melted filament 2 is sent out from 17. Hereinafter, the filament 2 in a molten state is referred to as a molten filament 2.

  The hopper 13 is a material input unit for supplying a thermoplastic resin as a material of the filament 2 into the extrusion molding machine 10. Examples of the thermoplastic resin that can be used include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamides such as nylon 66, polyvinyl chloride, and polystyrene. Alternatively, a copolymer or elastomer copolymerized based on these resins may be used, or these resins may be blended and used.

  The extruder 11 is a pressure melting part that melts a thermoplastic resin while applying pressure. A cylinder 11 a is formed inside the extruder 11. A screw 14 rotated by a screw motor 15 is inserted through the cylinder 11a. A screw heater 16 (16a, 16b, 16c) is provided on the outer periphery of the cylinder 11a. The screw 14 is a pressurizing and conveying member that pressurizes and melts a thermoplastic resin that is heated and melted by the screw heater 16 and conveys the thermoplastic resin from the filament discharging portion 11b to the die 12. The screw heater 16 is a heating unit that heats the thermoplastic resin in the cylinder 11a.

  The die 12 is a filament sending unit that sends the molten thermoplastic resin conveyed from the extruder 11 as a fibrous molten filament 2. A die guide channel 12 a is formed inside the die 12. The die heater 18 is a heating unit that heats the molten filament 2 passing through the die guide channel 12a. A plurality of openings (nozzle group 17a described later) having different opening cross-sectional areas are formed in the nozzle portion 17. The nozzle unit 17 feeds the molten filament 2 from the nozzle group 17a to the outside to form a plurality of fibrous molten filaments 2.

  A temperature sensor 19 (19a, 19b, 19c) for measuring the temperature of the molten filament 2 is provided in the vicinity of the die heater 18, and a temperature sensor (not shown) is also provided in the vicinity of the screw heater 16. Based on the temperature measurement results by these temperature sensors, the outputs of the screw heater 16 and the die heater 18 are controlled.

  The extruder 10 melts the thermoplastic resin supplied from the hopper 13 in the cylinder 11a by means of a screw 14, a screw heater 16, a die heater 18, and the like. Thereafter, the extrusion molding machine 10 leads out as a plurality of molten filaments 2 from a nozzle group 17a composed of a plurality of types of circular nozzles formed in the nozzle portion 17 via a die guide passage 12a inside the die 12. The further configuration of the nozzle portion 17 will be described in detail later.

  Next, the three-dimensional joined body forming apparatus 20 forms a three-dimensional network FTS 3 by fusion bonding and cooling and solidifying a plurality of molten filaments 2. The three-dimensional combined body forming apparatus 20 includes receiving plates 21a and 21b and a cooler 22 including a water tank 23 that stores cooling water 22a.

  The receiving plates 21a and 21b are an example of a filament coupling portion that is oppositely disposed in a reverse C shape when viewed in the same direction as that of FIG. The receiving plates 21 a and 21 b receive the plurality of fibrous molten filaments 2 sent from the die 12 below, and temporarily retain the molten filaments 2. In addition, the receiving plates 21 a and 21 b promote fusion bonding between the retained molten filaments 2 by the buoyancy action of the cooling water 22 a in the water tank 23. That is, the molten filament 2 receives the buoyancy of the cooling water 22a of the water tank 23 inside the receiving plates 21a and 21b, and the transport speed (take-off speed) of the slat conveyor 24 described later is slower than the falling speed of the molten filament 2. Since it is set, it stays inside the receiving plates 21a and 21b. At this time, the plurality of molten filaments 2 are partially fused and bonded three-dimensionally to form FTS 3.

  In addition, you may provide the cooling water supply water absorption apparatus (not shown) which supplies a cooling water to the whole surface of receiving plate 21a, 21b in the upper part of receiving plate 21a, 21b. By suppressing or preventing the temperature rise of the receiving plates 21a and 21b by supplying the cooling water, it is possible to prevent the molten filament 2 from being fused to the receiving plates 21a and 21b.

  The cooler 22 is an example of a filament cooling unit, and cools and solidifies the melted filament 2 that has been fusion bonded. The cooler 22 includes a water tank 23 that stores cooling water 22a, a pair of slat conveyors 24 (24a, 24b), a plurality of transport rollers 25a to 25g, and a transport motor 26.

  The pair of slat conveyors 24 (24a, 24b) and the plurality of transport rollers 25a to 25g are transport devices that transport the FTS 3. The pair of slat conveyors 24 is provided at the lower part in the vertical direction of the receiving plates 21a and 21b, and moves the mesh-like molten filament 2 having the three-dimensional fusion bond progressed downward while being cooled with the cooling water 22a. The cooled and solidified FTS 3 is conveyed. The conveying speed of the slat conveyor 24 is closely related to the filament density. That is, in relation to the cooling speed of the molten filament 2, the filament density decreases as the conveying speed increases, and the filament density increases as it decreases. The conveyance rollers 25 a to 25 g are arranged at the subsequent stage of the pair of slat conveyors 24 and convey the FTS 3 that has passed through the slat conveyors 24 to the outside of the water tank 23. In this embodiment, the slat conveyor 24 is used as an example of an endless conveyor, but there is no particular limitation as long as it is a transport device. For example, in place of the slat conveyor 24, an endless conveyor in which an endless wire mesh (not shown) is fixed to the outer peripheral portion of the plurality of guide plates 34 may be used.

  The transport motor 26 is a drive unit for a transport member that transports the FTS 3, and drives the pair of slat conveyors 24 and the plurality of transport rollers 25 (25 a to 25 g) at the same speed via gears (not shown), thereby moving the FTS 3 to the water tank 23. Transport outside.

  Next, a more detailed configuration of the slat conveyor 24 will be described. FIG. 4 is an enlarged view of the pair of slat conveyors 24. In FIG. 4, the pair of slat conveyors 24 includes a first slat conveyor 24a and a second slat conveyor 24b that are arranged in parallel at a predetermined interval, and is provided so that the conveying direction of the FTS 3 is vertically downward. ing. Hereinafter, the configuration of the first slat conveyor 24a will be mainly described. Since the configuration of the second slat conveyor 24b is the same as that of the first slat conveyor 24a, its description is omitted.

  The first slat conveyor 24 a includes a driven gear 31, a drive gear 32, an endless guide plate holding member 33, and a plurality of guide plates 34. The guide plate holding member 33 is a chain that is stretched by the driven gear 31 and the drive gear 32, and holds a plurality of guide plates 34. The driven gear 31 and the drive gear 32 are driven to rotate by the transport motor 26 (see FIG. 3) and drive the guide plate holding member 33. That is, the plurality of guide plates 34 are driven along the outer periphery of the slat conveyor 24 by a drive member configured by the driven gear 31, the drive gear 32, and the guide plate holding member 33.

  Each of the plurality of guide plates 34 is a plate-like conveying member that rotates together with the guide plate holding member 33 along the outer periphery of the first slat conveyor 24a, and moves the FTS 3 in contact with the surface thereof vertically downward.

  Next, a specific configuration of the nozzle unit 17 will be described. FIG. 5 is a diagram illustrating a main part of a discharge portion of the molten filament 2 of the nozzle portion 17 according to the first embodiment. Fig.5 (a) is a horizontal sectional view of the nozzle part 17 which concerns on 1st Embodiment, FIG.5 (b) is a horizontal sectional view of the nozzle part 117 which concerns on the modification of 1st Embodiment. In FIG. 5, the shape of the nozzle formation region in which the nozzle group 17 a is provided on the horizontal cross section (the cross section perpendicular to the discharge direction of the filament 2) of the discharge portion of the nozzle portion 17 is rectangular. It is not limited to the illustration. As long as the shape has a longitudinal direction and a short direction, it can be adopted according to the shape of the horizontal cross section (cross section orthogonal to the transport direction) of the FTS 3. The same applies to other embodiments (see FIGS. 8 and 10 described later).

  In FIG. 5A, the nozzle group 17a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 17b and a plurality of second nozzles 17c. The cross-sectional area (opening cross-sectional area) of the opening portion of the first nozzle 17b is larger than the opening cross-sectional area of the second nozzle 17c. The formation positions of the plurality of first nozzles 17b are gathered in the vicinity of the central portion (region of the central portion) in the short direction of the nozzle forming region on the horizontal section of the nozzle portion 17. The formation positions of the plurality of second nozzles 17c are gathered in the vicinity of the end portions (regions of the end portions) on both sides in the lateral direction in the nozzle formation region on the horizontal section of the nozzle portion 17.

In this embodiment, the internal diameter of the 1st nozzle 17b is 1 [mm], The opening cross-sectional area is 0.79 [mm < ² >]. The shortest distance between adjacent first nozzles 17b (inter-nozzle distance) is set to 10 [mm]. Moreover, the internal diameter of the 2nd nozzle 17c is 0.6 [mm], The opening cross-sectional area is 0.28 [mm < ² >]. The inter-nozzle distance between the adjacent second nozzles 17c and the shortest distance between the first nozzle 17b and the second nozzle 17c are each set to 6 [mm]. In addition, the shortest distance between each nozzle is not limited to the above-mentioned illustration, It can adjust suitably based on the repulsive force and smoothness specification of FTS3.

  Further, the ratio of the opening sectional area of the second nozzle 17c to the first nozzle 17b (second nozzle opening sectional area / first nozzle opening sectional area) is not particularly limited. However, if the ratio is too small, it is difficult to obtain the effects of the present invention. If the ratio is too large, it is difficult to stabilize the discharge rate per unit time of both the molten filaments 2 discharged from the first nozzle 17b and the second nozzle 17c. Therefore, the ratio of the opening cross-sectional area is preferably 1.5 or more and 15 or less, and more preferably 2 or more and 10 or less.

  The relatively thick molten filament (hereinafter sometimes referred to as “molten filament 2a”) discharged from the first nozzle 17b is likely to gather near the center of the FTS 3 in the thickness direction. Relatively thin molten filaments (hereinafter sometimes referred to as “molten filament 2b”) discharged from the second nozzle 17c are likely to gather near both end portions (surface layers) in the thickness direction of the FTS 3. As a result, the vicinity of the end of the FTS 3 in the thickness direction (hard surface layer) is compressed to increase the filament density, but the composition ratio of the relatively thin filament 2b is increased. Therefore, it can suppress that a hard surface layer becomes hard too much. On the other hand, in the vicinity of the central portion of the FTS 3 in the thickness direction, the composition ratio of the relatively thick filament 2a is increased, so that a reduction in repulsive force can be suppressed.

  The nozzle group 17 of the present embodiment can adjust the thickness and cross-sectional area of each filament 2 in the FTS 3 to be formed by adjusting the inner diameter and the cross-sectional area of the first nozzle 17b and the second nozzle 17c. . However, depending on the modulus of elasticity of the thermoplastic resin and the manufacturing conditions (distance from the lower end of the nozzle portion 17 to the water surface, etc.), the relationship between the relative thickness and the cross-sectional area does not change, but the nozzles 17b and 17c The inner diameter and cross-sectional area may not completely match the thickness and cross-sectional area of the filament 2. For this reason, the nozzles 17b and 17c are previously grasped in relation to the inner diameter and cross-sectional area of the nozzles 17 and the thickness and cross-sectional area of the filament 2 so that the desired thickness and cross-sectional area of the filament 2 are obtained. It is desirable to finely adjust the inner diameter and the cross-sectional area of 17b and 17c.

(Modified example of the nozzle part 17)
In FIG. 5B, the nozzle group 117a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 117b, second nozzles 117c, and third nozzles 117ca. The sectional area (opening sectional area) of each opening portion of the second nozzle 117c and the third nozzle 117ca is smaller than the opening sectional area of the first nozzle 117b. The nozzle unit 117 in FIG. 5B has the same configuration as the nozzle unit 17 in FIG. 5A except that the third nozzle 117ca is formed between the adjacent first nozzles 117b. .

  In the nozzle portion 117, the relatively thin molten filament 2c discharged from the third nozzle 117ca between the adjacent first nozzles 117b is combined with the relatively thick molten filament 2a discharged from the first nozzle 117b. Further, the bonding point density (linking density) per unit volume can be increased. Accordingly, since the local repulsion force generated at a location where the bonding point density is low can be reduced, the FTS 3 can obtain a stable repulsion force.

  In the present embodiment, the first nozzles 17b and 117b are not formed at the end portions in the short direction of the nozzle formation region on the horizontal cross section of the nozzle portions 17 and 117, but the present invention is not limited to this example. A smaller number of first nozzles 17b, 117b than the center in the hand direction may be formed at the end in the short direction. However, as the number of the first nozzles 17b and 117b formed at the ends in the short direction increases, the number of relatively thick filaments 2a existing in the surface layer of the FTS 3 also increases. The layer tends to be hard. Therefore, it is preferable to reduce the number of first nozzles 17b and 117b formed at the end portion in the short direction according to the hardness of the surface layer of FTS3. The same applies to other embodiments.

  Further, in the present embodiment, a solid molten filament 2 having a circular horizontal cross section is formed by using nozzle groups 17a and 117a in which the shape of the horizontal cross section of the opening portion is circular (see FIG. 6A). . The shape of the horizontal cross section of the opening portion is not limited to this example, and may be a polygonal shape such as a triangle, a quadrangle (see FIG. 6B), a hexagon (see FIG. 6C). If the polygonal nozzle groups 17a and 117a are used to form a melt filament 2 having a polygonal and solid cross section, the melt filaments 2 are brought into surface contact with each other to increase the contact area of the joint portion, and the bond strength thereof. Can be improved.

  Or even if the shape of the horizontal cross section of the opening part of nozzle group 17a, 117a is a shape which can form the melt filament 2 whose horizontal cross section becomes a hollow shape like FIG.6 (d)-(h), for example. Good. The nozzle groups 17a and 117a having a horizontal cross section as shown in FIGS. 6 (d) to 6 (f) are connected to the nozzle portions 17 and 117 main body at the central portion at any part (for example, upstream portion) in the discharge direction. This can be realized by connecting. Moreover, the outer peripheral shape and inner peripheral shape of the horizontal cross section of an opening part may be the same as FIG.6 (d)-(h), and may differ. In the molten filament 2 having a hollow cross section, the outer diameter has a greater influence on the smoothness and the repulsive force than the inner diameter. Therefore, when calculating these opening cross-sectional areas, it is desirable to calculate on the assumption that the molten filament 2 has no hollow portion.

  The FTS 3 described above can be applied to a mattress, for example. FIG. 7 is a conceptual diagram when the FTS 3 is used as a mattress. In the FTS 3 obtained by the FTS manufacturing apparatus 1 described above, the volume ratio of the relatively thin filament 2b to the relatively thick filament 2a is higher than the center portion in the thickness direction of the FTS 3 (that is, the surface layer portion of the mattress). ) Is great. Therefore, it can suppress that the surface layer of FTS3 becomes too hard, without impairing the repulsive force of FTS3. As a result, when FTS3 is applied to a mattress, it is possible to obtain a soft sleeping comfort that fits the shape of the body with a repulsive force that is easy to turn over.

  As described above, the FTS manufacturing apparatus 1 according to the present embodiment includes an extrusion molding machine 10 (melting filament supply device) that discharges a plurality of molten filaments 2 from the nozzle portions 17 and 117, and an FTS in which the melting filaments 2 are fusion-bonded to each other. A three-dimensional combined body forming apparatus 20 for forming a filament three-dimensional combined body) 3. The nozzle portions 17 and 117 are provided with nozzle groups 17a and 117a including first nozzles 17b and 117b and second nozzles 17c and 117c having smaller opening cross-sectional areas than the first nozzles 17b and 117b. In a predetermined direction on the cross section of the nozzle portions 17 and 117 intersecting the discharge direction of the molten filament 2, the first nozzles 17b and 117b are provided more in the central region than in the end region of the cross section, The second nozzles 17c and 117c are provided more in the end region than in the central region of the cross section.

  In this way, the relatively thick molten filament 2a is discharged from the first nozzles 17b and 117b, and the relatively thin molten filament 2b is discharged from the second nozzles 17c and 117c. Then, when the FTS 3 is formed by fusion bonding of the melt filaments 2, the relatively thick melt filament 2 a is formed at the center in a predetermined direction (for example, the thickness direction) on the cross section that intersects the formation direction of the FTS 3. More. Further, the relatively thin filament 2b is increased at the end portion (that is, the surface layer) in the predetermined direction.

  Therefore, it is possible to suppress a decrease in the repulsive force of the FTS 3 and further to suppress the surface layer from becoming excessively hard without reducing the surface smoothness. Therefore, the surface hardness can be reduced without impairing the repulsive force and surface smoothness of the FTS 3. In the present embodiment, relatively thin filaments 2b are increased at both ends (both the front side and the back side) in the predetermined direction, and the hardness of both surfaces can be reduced. However, only one end portion (one of the front side and the back side) in the predetermined direction may have a configuration in which the relatively thin filament 2b increases.

  In the FTS manufacturing apparatus 1, the nozzle groups 17a and 117a are provided in a nozzle forming region having a longitudinal direction and a short direction on the cross section, and the predetermined direction is a short direction of the nozzle forming region.

  By doing so, it is possible to form the FTS 3 having a shape in which the cross section perpendicular to the discharge direction of the molten filament 2 has a longitudinal direction and a transverse direction. Further, a large number of first nozzles 17b and 117b are provided at the center in the short direction of the nozzle formation region where the nozzle groups 17a and 117a are provided, and a large number of second nozzles 17c and 117c are provided at the end in the short direction. . Therefore, the thicker filament 2a is relatively thicker at the center of the FTS 3 in the thickness direction. Further, the relatively thin filament 2b is increased at the end portion (that is, the surface layer) in the thickness direction. Therefore, particularly in the thickness direction of the FTS 3, the surface hardness can be reduced without impairing the repulsive force and the surface smoothness.

  In the FTS manufacturing apparatus 1, the nozzle group 117 a further includes a third nozzle 117 ca having a smaller opening cross-sectional area than the first nozzle 117 b, and a cross section of the nozzle portion 117 intersecting with the discharge direction of the molten filament 2. In the predetermined direction above, the third nozzle 117ca is provided at the center of the cross section.

  In this way, the relatively thin filament 2b can also be present at the center portion in a predetermined direction (for example, the thickness direction) on the cross section intersecting with the formation direction of the FTS 3, and can be combined with the relatively thick filament 2a. Therefore, the bond point density per unit volume (linking density) in the central portion can be increased, and a stable repulsive force can be obtained. Therefore, for example, it is possible to reduce a decrease in local repulsion force that occurs in a portion having a low bonding point density.

  Further, in the FTS manufacturing apparatus 1, the first nozzles 17b and 117b are provided in the center in the short direction in the short direction of the nozzle formation region on the cross section, and the second nozzles 17c and 117c are the short side. Provided at the end of the direction.

  In this way, in the short direction of the nozzle formation region where the nozzle groups 17a and 117a are provided, the relatively thick filaments 2a are more in the center and the relatively thin filaments 2b are more in the surface layer. FTS3 can be formed. Therefore, the effect of reducing the surface hardness can be further enhanced without impairing the repulsive force and surface smoothness of FTS3.

  Further, the FTS 3 of the present embodiment is an FTS 3 in which a plurality of filaments 2 are three-dimensionally fusion bonded. The filament 2 includes a first filament 2a and a second filament 2b that is thinner than the first filament 2a. The volume ratio of the second filament 2b to the first filament 2a at the end in the thickness direction of the FTS 3 is larger than the volume ratio at the center of the FTS 3 in the thickness direction.

  By doing so, the thicker filament 2a is relatively thicker at the center in the thickness direction of the FTS 3, and the thinner filament 2b is more at the end (that is, the surface layer) in the thickness direction. Become. Therefore, it is possible to suppress a decrease in the repulsive force of the FTS 3 and further to suppress the surface layer from becoming excessively hard without reducing the surface smoothness. That is, the surface hardness can be reduced without impairing the repulsive force and surface smoothness of the FTS 3.

  Moreover, when FTS3 is used for a mattress, for example, it is possible to obtain a soft sleeping comfort that fits the shape of the body as well as a repulsive force that is easy to turn over. In the present embodiment, the volume ratio at both end portions (both the front side and the back side) in the thickness direction of the FTS 3 is larger than the volume ratio at the center portion. You can get a soft sleeping comfort even when facing up. However, only the volume ratio at one end (one of the front side and the back side) in the thickness direction of the FTS 3 may be larger than the volume ratio at the center.

Second Embodiment
Next, a second embodiment will be described. Hereinafter, a configuration different from the first embodiment will be described. Moreover, the same code | symbol is attached | subjected to the structure part similar to 1st Embodiment, and the description may be abbreviate | omitted.

  FIG. 8 is a diagram illustrating a main part of a discharge portion of the molten filament 2 of the nozzle portion 17 according to the second embodiment. FIG. 8A is a horizontal sectional view showing an example of the nozzle portion 217 according to the second embodiment. FIG. 8B is a horizontal sectional view showing an example of the nozzle portion 317 according to the first modification of the second embodiment. Moreover, FIG.8 (c) is a horizontal sectional view which shows an example of the nozzle part 417 which concerns on the 2nd modification of 2nd Embodiment.

  In FIG. 8A, the nozzle group 217a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 217b and a plurality of second nozzles 217c. The cross-sectional area (opening cross-sectional area) of the opening portion of the first nozzle 217b is larger than the opening cross-sectional area of the second nozzle 217c. The formation positions of the plurality of first nozzles 217b are gathered in the vicinity of the central portion in the short direction of the nozzle formation region on the horizontal section of the nozzle portion 217. The formation positions of the plurality of second nozzles 217c are gathered in the vicinity of the end portions on both sides in the lateral direction in the nozzle formation region on the horizontal section of the nozzle portion 217.

In the present embodiment, the shape of the horizontal cross section of the opening of the first nozzle 217b is substantially elliptical. The direction of the short diameter (shortest inner diameter) of the shape is the same as the short direction of the nozzle formation region on the horizontal cross section of the nozzle portion 217, and the direction of the long diameter (longest inner diameter) is on the horizontal cross section of the nozzle portion 217. This is the same as the longitudinal direction of the nozzle formation region. The opening sectional area of the first nozzle 217b is 1.62 [mm ² ], and the inter-nozzle distance between adjacent first nozzles 217b is set to 10 [mm]. Moreover, the shape of the horizontal cross section of the opening part of the 2nd nozzle 217c is circular, The internal diameter and opening cross-sectional area are 0.6 [mm] and 0.28 [mm < ² >], respectively. The inter-nozzle distance between the adjacent second nozzles 217c and the shortest distance between the first nozzle 217b and the second nozzle 217c are each set to 6 [mm]. In addition, the shortest distance between each nozzle is not limited to the above-mentioned illustration, It can adjust suitably based on the repulsive force and smoothness specification of FTS3.

  The ratio of the opening cross-sectional area of the second nozzle 217c to the first nozzle 217b is not particularly limited, but is preferably 1.5 to 15 and more preferably 2 to 10 as in the first embodiment. The

  The relatively thick and flat cross-section molten filament 2a discharged from the first nozzle 217b is likely to gather near the center of the FTS 3 in the thickness direction. The relatively thin molten filaments 2b discharged from the second nozzle 217c are likely to gather near both ends (surface layer) in the thickness direction of the FTS 3. As a result, the vicinity of the end of the FTS 3 in the thickness direction (hard surface layer) is compressed to increase the filament density, but the composition ratio of the relatively thin filament 2b is increased. Therefore, it can suppress that a hard surface layer becomes hard too much. On the other hand, in the vicinity of the central portion in the thickness direction of the FTS 3, the composition ratio of the filament 2a having a relatively thick and flat cross section becomes high. Further, the thick filament 2a having a flat cross section preferentially forms waves in the thickness direction of the FTS 3 (that is, the short direction in the nozzle formation region on the horizontal cross section of the nozzle portion 217). For this reason, it is possible to suppress a decrease in the repulsive force and obtain a stable repulsive force.

(First Modification of Nozzle 217)
In FIG. 8B, the nozzle group 317a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 317b, second nozzles 317c, and third nozzles 317ca. The sectional area (opening sectional area) of each opening portion of the second nozzle 317c and the third nozzle 317ca is smaller than the opening sectional area of the first nozzle 317b. The nozzle portion 317 in FIG. 8B has the same configuration as the nozzle portion 217 in FIG. 8A except that the third nozzle 317ca is formed between the adjacent first nozzles 317b. .

  In the nozzle portion 317, the relatively thin molten filament 2c discharged from the third nozzle 317ca between the adjacent first nozzles 317b is combined with the relatively thick molten filament 2a discharged from the first nozzle 317b. Further, the bonding point density (linking density) per unit volume can be increased. Accordingly, since the local repulsion force generated at a location where the bonding point density is low can be reduced, the FTS 3 can obtain a stable repulsion force.

(Second Modification of Nozzle 217)
The nozzle portion 417 in FIG. 8C has the same configuration as the nozzle portion 217 in FIG. 8A except that the shape of the horizontal section of the opening of the first nozzle 417b is different. The shape of the horizontal section of the opening of the first nozzle 417b is rectangular. The short direction and the long direction of the shape are the same as the short direction and the long direction of the nozzle forming region on the horizontal cross section of the nozzle portion 417, respectively. The opening sectional area of the first nozzle 417b is 1.80 [mm ² ], and the inter-nozzle distance between adjacent first nozzles 417b is set to 10 [mm]. The inter-nozzle distance between the adjacent second nozzles 417c and the shortest distance between the first nozzle 417b and the second nozzle 417c are each set to 6 [mm]. In addition, the shortest distance between each nozzle is not limited to the above-mentioned illustration, It can adjust suitably based on the repulsive force and smoothness specification of FTS3.

  In addition, the shape of the horizontal cross section of the opening part of 1st nozzle 217b, 317b, 417b is not restrict | limited to the illustration of FIG. The shapes of the first nozzles 217b, 317b, and 417b are as shown in FIGS. 9 (c) and 9 (d) in addition to a substantially oval shape (see FIG. 9 (a)) and a rectangle (see FIG. 9 (b)). It may be a flat shape having a minor axis and a major axis. Furthermore, the shape of the horizontal cross section of the opening portion of the first nozzles 217b, 317b, and 417b may be a continuous circular shape in which circular openings are continuously overlapped in one direction as shown in FIGS. Good. The molten filament 2 discharged from the continuous circular shape becomes flat due to surface tension. Moreover, since the shape of the horizontal cross section of the opening part of the 1st nozzles 217b, 317b, 417b can be easily formed, for example by drilling with a drill, the manufacturing cost of the nozzle parts 217, 317, 417 can be reduced.

  The aspect ratio of the major axis (length in the longitudinal direction) to the minor axis (length in the lateral direction) of the flat shape as described above is preferably 2 or more and 10 or less, and more preferably 3 or more and 5 or less. Is done. When the aspect ratio is smaller than 2, the wave direction (amplitude direction) of the molten filament 2 varies. That is, since the freedom degree of a wave direction becomes high, the ratio of the molten filament 2 which waves in a transversal direction falls. On the other hand, if the aspect ratio is greater than 10, the degree of freedom in the wave direction of the molten filament 2 is reduced, so that the wave direction of the molten filament 2 is too uniform. That is, the ratio of the molten filaments 2 that wave in the short direction becomes very large, and the ratio of the molten filaments 2 that wave in other than the short direction decreases. Therefore, since the bonding (linking) with other adjacent filaments 2 other than the short direction is reduced, a region where the repulsive force is locally reduced is likely to occur.

  As described above, in the FTS manufacturing apparatus 1 of the present embodiment, the opening shapes of the first nozzles 217b, 317b, and 417b are shapes having a major axis and a minor axis on the cross section. The minor axis is the inner diameter of the opening shape of the first nozzles 217b, 317b, and 417b in the lateral direction of the region on the cross section.

  If it carries out like this, the cross section of the relatively thick filament 2a discharged | emitted from the 1st nozzle 217b, 317b, 417b can be made into the flat shape which has a major axis and a minor axis. Furthermore, the relatively thick flat filament 2a is easily waved in a predetermined direction (for example, the thickness direction) on the cross section of the FTS 3 when discharged. Therefore, the repulsive force (hardness) of the FTS 3 in the predetermined direction can be easily stabilized.

  In the FTS manufacturing apparatus 1, the aspect ratio of the major axis to the minor axis of the opening shape of the first nozzles 217b, 317b, and 417b is 2 or more and 10 or less.

  If it carries out like this, the freedom degree of the wave direction (amplitude direction) of the relatively thick flat filament 2a discharged | emitted from the 1st nozzle 217b, 317b, 417b can be adjusted moderately. That is, it is possible to prevent the wave direction from being excessively varied in a direction other than a predetermined direction on the cross section (for example, the short direction of the nozzle formation region) or not aligned in the short direction. Therefore, it is possible to suppress a decrease in bonding (linking) with another filament 2 adjacent in a direction other than the predetermined direction, and to suppress a decrease in local repulsive force.

<Third Embodiment>
Next, a third embodiment will be described. Hereinafter, a configuration different from the first and second embodiments will be described. Moreover, the same code | symbol is attached | subjected to the component similar to 1st and 2nd embodiment, and the description may be abbreviate | omitted.

  FIG. 10 is a diagram illustrating a main part of a discharge portion of the molten filament 2 of the nozzle portion 17 according to the third embodiment. FIG. 10A is a horizontal sectional view showing an example of the nozzle portion 517 according to the third embodiment, and FIG. 10B is a horizontal view showing an example of the nozzle portion 617 according to the modification of the third embodiment. It is sectional drawing.

  In FIG. 10A, the nozzle group 517a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 517b and a plurality of second nozzles 517c. The cross-sectional area (opening cross-sectional area) of the opening portion of the first nozzle 517b is larger than the opening cross-sectional area of the second nozzle 517c. The formation positions of the plurality of first nozzles 517b are gathered in the vicinity of the center in the short direction of the nozzle formation region on the horizontal section of the nozzle portion 517. The formation positions of the plurality of second nozzles 517c are gathered in the vicinity of the ends on both sides in the lateral direction in the nozzle formation region on the horizontal section of the nozzle portion 517. In addition, between the adjacent first nozzles 517b, a third nozzle 517ca in which an opening cross-sectional area of an opening (see FIG. 6) having a non-flat horizontal cross section is smaller than that of the first nozzle 517b may be formed. .

  In this embodiment, each shape of the horizontal cross section of the opening part of the 1st nozzle 517b and the 2nd nozzle 517c is a rectangle. The short side direction and the long side direction of the first nozzle 517b are the same as the short side direction and the long side direction of the nozzle forming region on the horizontal section of the nozzle portion 517, respectively. The short side direction and the long side direction of the second nozzle 517c are the same as the long side direction and the short side direction of the nozzle forming region on the horizontal section of the nozzle portion 517, respectively.

The opening sectional area of the first nozzle 517b is 1.60 [mm ² ], and the inter-nozzle distance between adjacent first nozzles 517b is set to 10 [mm]. The opening sectional area of the second nozzle 517c is 0.25 [mm ² ], and the distance between adjacent nozzles 517c and the shortest distance between the first nozzle 517b and the second nozzle 517c are 6 respectively. [Mm] is set. In addition, the shortest distance between each nozzle is not limited to the above-mentioned illustration, It can adjust suitably based on the repulsive force and smoothness specification of FTS3.

  The ratio of the opening cross-sectional area of the second nozzle 517c to the first nozzle 517b is not particularly limited, but is preferably 1.5 to 15 and more preferably 2 to 10 as in the first and second embodiments. It is as follows.

  The relatively thick and flat cross-section molten filament 2a discharged from the first nozzle 517b is likely to gather near the center of the FTS 3 in the thickness direction. Therefore, in the vicinity of the central portion in the thickness direction of the FTS 3, the composition ratio of the filament 2a having a relatively thick and flat cross section becomes high. Further, the thick filament 2a having a flat cross section preferentially forms waves in the thickness direction of the FTS 3 (that is, the short direction in the nozzle formation region on the horizontal cross section of the nozzle portion 217). For this reason, it is possible to suppress a decrease in the repulsive force and obtain a stable repulsive force.

  Also, the relatively thin and flat cross-section molten filament 2b discharged from the second nozzle 517c is likely to gather near both ends (surface layer) in the thickness direction of the FTS 3. As a result, the vicinity of the end of the FTS 3 in the thickness direction (hard surface layer) is compressed to increase the filament density, but the composition ratio of the relatively thin flat filament 2b is increased. Furthermore, the relatively thin flat filament 2b preferentially forms waves in the width direction of the FTS 3 (that is, the longitudinal direction in the nozzle formation region on the horizontal section of the nozzle portion 517). In addition, since the wave in the thickness direction is densified by compression of the end portion in the thickness direction, it becomes easy to form a relatively thin lump of flat filament 2b. Therefore, it can suppress that a hard surface layer becomes hard too much, and also can improve the smoothness of the thickness direction edge part vicinity (hard surface layer).

(Modified example of nozzle part 517)
In FIG. 10B, the nozzle group 617a formed at the discharge portion of the molten filament 2 includes a plurality of first nozzles 617b, second nozzles 617c, and third nozzles 617ca. The sectional area (opening sectional area) of each opening portion of the second nozzle 617c and the third nozzle 617ca is smaller than the opening sectional area of the first nozzle 617b. The nozzle unit 617 in FIG. 10B has the same configuration as the nozzle unit 517 in FIG. 10A except that a flat third nozzle 617ca is formed between adjacent first nozzles 617b. It has become.

  In the nozzle portion 617, the relatively thin molten filament 2c discharged from the third nozzle 617ca between the adjacent first nozzles 617b is combined with the relatively thick molten filament 2a discharged from the first nozzle 617b. Further, the bonding point density (linking density) per unit volume can be increased. Therefore, it is possible to reduce a decrease in the local repulsive force generated at a location where the bonding point density is low.

  In the present embodiment, the shape of the horizontal cross section of the opening portions of the second nozzles 517c and 617c and the third nozzle 617ca is not limited to the illustration of FIG. 10, but may be other shapes like the first nozzles 517b and 617b. Since there may be (refer FIG. 9 (a) and FIG.9 (c)-(g)), these description is omitted.

  Next, the wave direction in the horizontal cross section of the FTS 3 of the molten filament 2 discharged from the nozzle portion 517 of FIG. FIG. 11 is a conceptual diagram showing the preferential vibration direction (wave direction) of the molten filament 2 discharged from a nozzle group 517a (see FIG. 10A) composed of flat nozzles. FIG. 12 is a conceptual diagram showing the wave directions of the thick flat filament 2a and the thin flat filament 2b in the FTS 3. 11 and 12 illustrate the case where the horizontal cross-sectional shape of the opening portion of the first nozzle 517b and the second nozzle 517c is a rectangle (see FIG. 9B), the present invention is limited to this example. For example, the same applies to the shapes as shown in FIGS. 9A and 9C to 9G.

  In FIG. 11, the first nozzle 517 b is formed such that the short diameter direction of the cross-sectional shape of the opening portion is the short direction of the nozzle formation region on the horizontal cross section of the nozzle portion 517. Therefore, the molten filament 2a preferentially waves in the short direction (for example, the thickness direction of the mattress) of the nozzle forming region on the horizontal section of the nozzle portion 517. The second nozzle 517 c is formed such that the minor axis direction of the cross-sectional shape of the opening portion is the longitudinal direction of the nozzle formation region on the horizontal cross section of the nozzle portion 517. Therefore, the molten filament 2 waves preferentially in the longitudinal direction (for example, the width direction of the mattress) of the nozzle formation region on the horizontal section of the nozzle portion 517.

  As shown in FIG. 12, the relatively thick flat filament 2a discharged from the first nozzle 517b waves preferentially in the thickness direction of the FTS 3 (mattress), and the amplitude in the thickness direction becomes larger than the amplitude in the width direction. . On the other hand, the relatively thin flat filament 2b discharged from the second nozzle 517c preferentially waves in the width direction of the FTS 3 (mattress), and the amplitude in the width direction becomes larger than the amplitude in the thickness direction.

  When the molten filament 2 is discharged from the nozzle portion 517, the relatively thin flat filament 2b located near the end in the width direction of the molten filament 2 group (that is, the width direction of the FTS 3) is a backing plate of the filament coupling portion 21. It is regulated by 21a and 21b and is compression-molded toward the central portion in the width direction. Therefore, in the surface layer at the end portion in the width direction of the two groups of molten filaments, the filament density is stabilized and it becomes easy to smooth. Further, the relatively thick flat filament 2a located in the vicinity of the central portion in the width direction of the melt filament 2 group (that is, the width direction of the FTS 3) is melted without being regulated by the receiving plates 21a and 21b of the filament coupling portion 21. It is formed so that the amplitude in the width direction of the filament 2 group (that is, the thickness direction of the FTS 3) is increased. Therefore, the repulsive force of FTS3 is easily stabilized. If the amplitude in the thickness direction is small, the repulsive force decreases.

  In FIGS. 11 and 12, the shape of the filament 2 is illustrated as a sine curve to simplify the drawing. However, in actuality, the shape of the filament 2 is a complicated shape such as a loop or an 8-character depending on manufacturing conditions. Is formed. 11 and 12, only two types of the first nozzle 517b and the second nozzle 517c are used as shown in FIG. 10A. For example, as shown in FIG. Or you may use 3 or more types of nozzles from which the shape of the horizontal cross section of an opening part differs.

  As described above, in the FTS manufacturing apparatus 1 of the present embodiment, the opening shape of the second nozzles 517c and 617c is a shape having a major axis and a minor axis on the cross section, and the minor axis is the nozzle formation region on the cross section. Of the second nozzles 517c and 617c in the longitudinal direction.

  If it carries out like this, the cross section of the relatively thin filament 2c discharged | emitted from the 2nd nozzles 517c and 617c can be made into the flat shape which has a major axis and a minor axis. Furthermore, the relatively thin flat filament 2c is easily waved in the longitudinal direction (for example, the width direction of the FTS 3) of the region where the nozzle groups 517a and 617a are provided when discharged. Therefore, the bonding (linking) with other filaments 2 (particularly relatively thick filaments 2a) can be promoted, and the bonding strength between the filaments 2 can be improved.

  In the FTS manufacturing apparatus 1, the nozzle groups 517 a and 617 a further include third nozzles 517 ca and 617 ca having an opening cross-sectional area smaller than that of the first nozzles 517 b and 617 b, and intersect the discharge direction of the molten filament 2. The third nozzles 517ca and 617ca are provided at the center of the cross section in a predetermined direction on the cross section of the nozzle portions 517 and 617.

  In this way, the relatively thin filament 2c can also be present at the central portion in a predetermined direction (for example, the thickness direction) on the cross section that intersects with the formation direction of the FTS 3, and can be combined with the relatively thick filament 2a. Therefore, the bond point density per unit volume (linking density) in the central portion can be increased, and a stable repulsive force can be obtained. Therefore, for example, it is possible to reduce a decrease in local repulsion force that occurs in a portion having a low bonding point density.

  The embodiment of the present invention has been described above. The above-described embodiment is an exemplification, and various modifications can be made to the combination of each component and each process, and it will be understood by those skilled in the art that it is within the scope of the present invention.

  The FTS3 manufacturing apparatus 1 and FTS3 manufacturing method according to the present invention can be used for manufacturing FTS3 used for mattresses, pillows, and cushions.

1 ... Filament three-dimensional joined body manufacturing apparatus (FTS manufacturing apparatus)
2 ... Molten filament 3 ... Filament three-dimensional combination (FTS)
DESCRIPTION OF SYMBOLS 10 ... Extruder 11 ... Pressure part 11a ... Cylinder 11b ... Filament discharge part 12 ... Die 12a ... Die guide flow path 13 ... Hopper 14 ... Screw 15 ... Screw motor 16 (16a, 16b, 16c) ... Screw heater 17, 117, 217, 317, 417, 517, 617 ... Nozzle part 17a, 117a, 217a, 317a, 417a, 517a, 617a Nozzle group 17b, 117b, 217b, 317b, 417b, 517b, 617b ... 1st nozzle 17c, 117c, 217c, 317c, 417c, 517c, 617c ... 2nd nozzle 117ca, 117ca, 317ca, 617ca .. Third nozzle 18 ・ ・ ・ Daihi -19 (19a, 19b, 19c) ... Temperature sensor 20 ... Three-dimensional combined body forming device 21 (21a, 22b), 61 (61a, 61b) ... Receiving plate 22 ... Cooling machine 22a .... Cooling water 23 ... Water tank 24 (24a, 24b) ... Slat conveyor 25a, 25b, 25c, 25d, 25e, 25f, 25g ... Conveyance roller 26 ... Conveyance motor 31 ... Drive gear 32 ... Follower gear 33 ... Guide plate holding member 34 ... Guide plate

Claims (9)

A molten filament supply device for discharging a plurality of molten filaments from the nozzle portion;
A three-dimensional joined body forming apparatus for forming a filament three-dimensional joined body in which the melt filaments are fusion-bonded,
The nozzle portion is provided with a nozzle group including a first nozzle and a second nozzle having a smaller opening cross-sectional area than the first nozzle,
In a predetermined direction on the cross section of the nozzle portion that intersects the discharge direction of the molten filament, the first nozzle is provided more in the central portion than the end portion of the cross section, and the second nozzle is more than the central portion. A filament three-dimensional joined body manufacturing apparatus, characterized in that a large number are provided at the end.   2. The filament three-dimensional joined body manufacturing method according to claim 1, wherein the nozzle group is provided in a region having a longitudinal direction and a lateral direction on the cross section, and the predetermined direction is the lateral direction. apparatus. On the cross section, the opening shape of the first nozzle is a shape having a major axis and a minor axis,
The apparatus for producing a three-dimensional filament assembly according to claim 2, wherein the short diameter is an inner diameter of an opening shape of the first nozzle in the short direction.   The apparatus for producing a three-dimensional filament assembly according to claim 3, wherein the ratio of the major axis to the minor axis of the opening shape of the first nozzle is 2 or more and 10 or less. On the cross section, the opening shape of the second nozzle is a shape having a major axis and a minor axis,
5. The filament three-dimensional joined body manufacturing apparatus according to claim 2, wherein the short diameter is an inner diameter of an opening shape of the second nozzle in the longitudinal direction. The nozzle group further includes a third nozzle having an opening cross-sectional area smaller than that of the first nozzle,
The filament three-dimensional joined body manufacturing apparatus according to any one of claims 1 to 5, wherein the third nozzle is provided at a central portion of the cross section in the predetermined direction. On the cross section, the opening shape of the third nozzle is a shape having a major axis and a minor axis,
The apparatus for producing a three-dimensional filament assembly according to claim 6, wherein the minor axis is an inner diameter of the opening shape of the third nozzle in the longitudinal direction.   The first nozzle is provided more at the center than at both ends of the cross section in the predetermined direction, and the second nozzle is provided at the both ends more than the center. The filament three-dimensional joined body manufacturing apparatus according to claim 7. A filament three-dimensional combination in which a plurality of filaments are three-dimensionally fused and bonded,
The filament includes a first filament and a second filament thinner than the first filament,
In the thickness direction of the three-dimensional filament bonded body, the volume ratio of the second filament to the first filament at the end is larger than the volume ratio at the center. .