JP5882048B2 - Multiaxial nonwoven fabric manufacturing method and multiaxial nonwoven fabric manufacturing apparatus - Google Patents

Description

  The present invention relates to a method for producing a multiaxial nonwoven fabric having oblique yarns obliquely crossed in an oblique direction and a reverse oblique direction, and an apparatus for producing the multiaxial nonwoven fabric.

  Conventionally, a multiaxial nonwoven fabric has a conveyance part provided with a pair of left and right thread hanging part rows in which a plurality of yarn hanging parts are erected along the conveying direction, and a plurality of yarn discharge parts arranged along the conveying direction. It is manufactured using a traverser (see, for example, Patent Document 1). In this manufacturing method, the yarn is hooked on the yarn hooking section by the conveyance of the yarn hooking section by the conveying section and the reciprocating movement of the traverser. Yarn is stretched. In this manufacturing method, the yarn discharging portion of the traverser forms an oblique yarn while passing over the inclined yarn already spanned by the yarn hooking portion. At this time, there is a possibility that the yarn discharging portion may cause yarn breakage by contacting the already inclined slanted yarn. In order to avoid such contact, Japanese Patent Application Laid-Open No. H10-228667 discloses a guide for pushing down when the traverser is reciprocated so that the yarn discharging portion is positioned above the upper end of the yarn hooking portion, and the yarn is hooked on the yarn hooking portion. A method to push down the thread is proposed.

Japanese Patent Laid-Open No. 01-306664 JP 2005-15981 A

  However, according to the method using the push-down guide described in Patent Document 2, although the contact between the yarn discharge portion and the already inclined slant yarn is avoided, the guide that pushes down the yarn discharged from the yarn discharge portion. The load on the yarn increases because it is pushed down by. In addition, the push-down guide causes complication around the yarn discharge portion.

  The present invention has been made in view of such circumstances, and its purpose is to suppress the load on the yarn and avoid complication around the yarn discharging portion when avoiding contact between the yarn discharging portion and the inclined yarn. An object of the present invention is to provide a method for producing a multiaxial nonwoven fabric and an apparatus for producing a multiaxial nonwoven fabric that are easy to do.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a first yarn hooking portion row in which a plurality of first yarn hooking portions are arranged along the carrying direction and a plurality of second yarn hooking portions being conveyed. Using a transport unit including a second yarn hooking portion array arranged along a direction, and a traverser having a plurality of yarn discharge units arranged above the transport unit and arranged along the transport direction. The plurality of yarn discharging portions are positioned below the upper ends of the first yarn hooking portion and the second yarn hooking portion, and the traverser is reciprocated along a direction intersecting the conveying direction of the conveying portion. Then, an oblique process is performed in which the yarn is alternately wound around the first yarn hooking portion and the second yarn hooking portion to form an oblique yarn in which the yarn is obliquely crossed in the oblique direction and the reverse oblique direction. A multiaxial nonwoven fabric manufacturing method for performing a joining step of joining the intersections of the oblique yarns, In oblique step, the upper inclined yarn discharged from the yarn discharge portion, when the yarn discharging section adjacent to the conveying direction passes for the yarn discharging portion, the supply amount of the yarn to the traverser By adjusting, the gist of the inclined yarn discharged from the yarn discharge portion is displaced below the yarn discharge portion adjacent to the yarn discharge portion in the transport direction by utilizing the weight of the yarn. .

  According to this method, contact between the yarn discharge portion and the inclined yarn can be avoided by the displacement of the inclined yarn using the own weight of the yarn, so that the load on the yarn is suppressed when the contact is avoided. Further, since the inclined yarn is displaced below the yarn discharge portion by adjusting the amount of yarn supplied to the traverser, it becomes easy to avoid complications around the yarn discharge portion.

  Invention of Claim 2 is a manufacturing method of the polyaxial nonwoven fabric of Claim 1, In this manufacturing method, these yarn discharge | emission parts are located upwards with respect to the said conveyance part, so that it is located in the said conveyance direction. The gist is that the crossing step is performed.

  In the oblique crossing process, the yarn discharge portion passes above the oblique yarn discharged by the yarn discharge portion adjacent to the side opposite to the conveyance direction (upstream side in the conveyance direction). According to the above method, since the plurality of yarn discharge units are positioned higher as they are positioned in the transport direction and the oblique crossing process is performed, the yarn discharge unit and the yarn discharge unit positioned on the upstream side in the transport direction It is even easier to avoid contact with the yarn discharged from the thread.

  Invention of Claim 3 is a manufacturing apparatus of the polyaxial nonwoven fabric used for the manufacturing method of the polyaxial nonwoven fabric of Claim 1 or Claim 2, Comprising: The said conveyance part, the said traverser, and the said traverser thread | yarn And a plurality of yarn supplying devices to be supplied, and the amount of yarn supplied to the traverser is adjusted by rotational driving of the plurality of yarn supplying devices.

The manufacturing method mentioned above can be implemented using the manufacturing apparatus comprised in this way.
Invention of Claim 4 is a manufacturing apparatus of the polyaxial nonwoven fabric of Claim 3 , Each of these yarn feeding apparatus is provided with the drive wheel, respectively, Each drive wheel has a clutch mechanism , respectively , the clutch mechanism, when the force to leave-out forcibly pull the yarn supplied by the driving rotation of the driving wheel is applied to the yarn, the rotational drive of the drive wheel is configured to be released, the rotating the release has been the drive wheel of the drive, it is summarized in that the yarn at a faster rotational speed than the rotational speed of the rotary drive is pulled out.

According to this arrangement, when the force to leave-out forcibly pull the yarn supplied by rotation of the driving wheel is applied to the yarn, faster rotational speed than the rotational speed of the rotary drive the rotary drive is released The thread is pulled out from the drive wheel . Thereby, the supply amount of the yarn to the traverser can be increased while suppressing application of excessive tension to the yarn.

  The invention according to claim 5 is the multiaxial nonwoven fabric manufacturing apparatus according to claim 3 or 4, wherein the plurality of yarn feeding devices are provided at positions not interlocked with the reciprocating motion of the traverser. The gist.

According to this configuration, the plurality of yarn feeding devices are not easily affected by vibrations and impacts associated with the reciprocating movement of the traverser, so that each yarn feeding device can be stably operated.
Invention of Claim 6 is a manufacturing apparatus of the polyaxial nonwoven fabric as described in any one of Claims 3-5. WHEREIN: These yarn feeding apparatuses are connected with the common drive shaft. Is the gist.

  According to this configuration, since a plurality of yarn feeding devices can be driven by a single drive source, control of each yarn feeding device is facilitated.

  According to the present invention, when avoiding contact between the yarn discharge portion and the inclined yarn, a method for producing a multiaxial nonwoven fabric that can easily suppress the load on the yarn and avoid complication around the yarn discharge portion, and An apparatus for producing a multiaxial nonwoven fabric is provided.

(A) is a top view which partially shows the outline of the manufacturing apparatus of embodiment, (b) is a side view which shows the outline of a manufacturing apparatus partially, (c) is a side view which expands and shows a part of manufacturing apparatus Figure. (A)-(d) is the schematic which shows the flow of an oblique process. (A) is a graph which shows the relationship between time T and the distance D to a 2nd thread hook part in a crossing process, (b) is a graph which shows the relationship between time T and the supply amount F of a thread | yarn. (A) is a top view which shows the outline of the location which implements a warp arrangement | positioning process and a joining process in a manufacturing apparatus, (b) is a top view which expands and shows a polyaxial nonwoven fabric. Schematic which shows a manufacturing apparatus. Schematic which shows a yarn feeder and a traverser. Schematic which shows the example of a change of a yarn feeder. The side view which shows the example of a change of a manufacturing apparatus.

Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1A, the method for producing a multiaxial nonwoven fabric includes a transport unit 31 including a first yarn hooking part row 11 and a second yarn hooking part row 21, and a traverser disposed above the transporting part 31. 41.

  The first thread hook section 11 is formed by arranging a plurality of first thread hook sections 12, 12,... Along the transport direction. Each first yarn hooking portion 12 has a columnar shape and is erected on the first conveyor 13. The second yarn hooking portion row 21 is formed by arranging a plurality of second yarn hooking portions 22, 22... In the transport direction. Each of the second yarn hooking portions 22 has a cylindrical shape, and is erected on a second conveyor 23 that is arranged in parallel with the first conveyor 13 at an interval. Each yarn hooking part row 11, 21 is conveyed by moving each conveyor 13, 23 horizontally at the same speed.

  As shown in FIGS. 1B and 1C, the traverser 41 includes a traverser body 42 reciprocated along a direction orthogonal to the conveying direction, and a plurality of yarn guide tubes extending downward from the traverser body 42. 43. The traverser 41 is controlled so as to reciprocate at a constant time, and the distance that the transport unit 31 moves per time when the traverser 41 reciprocates once is controlled to be constant. The traverser 41 discharges the yarn from each yarn discharge portion 43a which is the tip portion of each yarn guide tube 43 through the plurality of yarn guide tubes 43, 43.

In the method for producing a multiaxial nonwoven fabric, an oblique process is performed in which an oblique yarn is formed by obliquely intersecting a yarn in an oblique direction and a reverse oblique direction by using the transport unit 31 and the traverser 41 described above.
In the crossing step, each yarn discharge portion 43a is positioned below the upper ends of each first yarn hooking portion 12 and each second yarn hooking portion 22. As a result, the yarn discharged from each yarn discharging portion 43a can be hooked on each yarn hooking portion 12, 22. Then, the traverser 41 is horizontally reciprocated along the direction intersecting the transport direction of the transport unit 31, whereby the yarn discharged from the yarn discharge unit 43 a is the first yarn hook unit 12 and the second yarn hook unit 22. And are alternately bridged. At this time, since each of the yarn hooking section rows 11 and 21 is conveyed in a fixed direction, as shown in FIG. 1A, the yarn is inclined with the inclined yarn 71a extending obliquely with respect to the moving direction of the traverser 41 The slanted yarn 71a extends in the reverse oblique direction and is stretched over the yarn hooking portions 12 and 22. The slanted yarn 71a and the slanted yarn 71a are overlapped in the vertical direction, so that the oblique yarn 71 is formed.

  Examples of the yarn used in the crossing step include multifilaments, monofilaments, tapes, and belts. In the present embodiment, a multifilament having heat fusibility is used.

  As shown in FIG. 1 (b), in the oblique process, the plurality of yarn discharge portions 43a, 43a,... Thereby, the yarn discharge portion 43a discharges the yarn from a position below the yarn discharge portion 43a adjacent in the transport direction.

  The crossing step is performed by adjusting the amount of yarn supplied to the traverser 41. As a result, as shown in FIG. 1 (c), the inclined yarn 71a discharged from the yarn discharge portion 43a located on the opposite side (upstream side of the transfer direction) to the transfer direction is made to the yarn discharge portion 43a. The yarn is displaced by using its own weight below the yarn discharge portion 43a adjacent to the downstream side in the conveying direction. The interval between the inclined yarn 71a thus discharged from the yarn discharge portion 43a and the yarn discharge portion 43a adjacent to the downstream side in the transport direction with respect to the yarn discharge portion 43a is the interval shown in FIG. S. The interval S is generated by adding the distance B based on the setting of the position of each yarn discharge portion 43a described above to the distance A based on the adjustment of the yarn supply amount to the traverser 41.

  When the traversing process is described in detail, as shown in FIG. 2A, when the traverser 41 is reversed, the slanting thread 71a is displaced downward by supplying excessive yarn to the traverser 41. Such an excessive supply of yarn is continued even after the traverser 41 is reversed as shown in FIG. As the traverser 41 approaches the first yarn hooking portion 12, the slack of the inclined yarn 71a decreases, and tension is applied in the direction in which the yarn is pulled out from the yarn discharging portion 43a as shown in FIG. 2 (c). Become. Subsequently, when the traverser 41 further approaches the first yarn hooking portion 12, the inclined yarn 71a is again displaced downward as shown in FIG. 2 (d).

  The adjustment of the supply amount of the yarn accompanying the displacement of the yarn will be specifically described. The distance between the second yarn hooking portion 22 and the yarn discharging portion 43a shown in FIGS. 2A to 2D is determined by the conveyance of the second yarn hooking portion 22 and the movement of the traverser 41. Here, the conveyors 13 and 23 are driven at a constant speed. Such driving of the conveyors 13 and 23 can simplify drive control. Moreover, the moving speed of the traverser 41 is set so as to be faster near the center between the yarn hooking portions 12 and 22 than in the vicinity of the yarn hooking portions 12 and 22, thereby increasing the efficiency of the crossing process. It becomes easy. As shown in FIG. 3A, the driving of the conveying unit 31 and the driving of the traverser 41 increase the distance D from the second yarn hooking unit 22 to the yarn discharging unit 43a with the passage of time T, The amount of change in the distance D per unit time varies depending on the speed of the traverser 41.

  On the other hand, the yarn supply amount F to the traverser 41 is adjusted, for example, as shown in FIG. At time T1 shown in FIG. 3B, the yarn supply speed to the traverser 41 is constant. At this time T1, the yarn supply amount F (yarn supply length) is excessive with respect to the distance D, so that the inclined yarn 71a is displaced downward. Then, with the passage of time T and the increase in the distance D, the inclined thread 71a and the distance D are made substantially the same, so that the time T2 is reached. Next, at time T2, the yarn supply amount (supply speed) to the traverser 41 is increased in order to maintain the yarn supply amount F (yarn supply length) to be substantially the same as the distance D. Thereby, application of excessive tension to the yarn is suppressed. Note that the yarn supply amount F at time T2 is not necessarily the same as the distance D, and may be adjusted in consideration of mechanical properties such as the strength and elongation of the yarn used in the oblique process.

  Subsequently, at time T3, the yarn supply speed is set to the same supply speed as at time T1. At the time T3, the yarn supply amount F (yarn supply length) is excessive with respect to the distance D, whereby the inclined yarn 71a is displaced downward.

The adjustment of the supply amount of the yarn when the inclined yarn 71a is bridged from the second yarn hooking portion 22 to the first yarn hooking portion 12 is the same, and the description thereof is omitted.
After the crossing step, a warp arranging step of arranging the warp along the conveying direction with respect to the crossing yarn 71 is performed. In the warp arranging step, as shown in FIG. 4A, the upper warp 72 is arranged by the upper warp supplying unit 62 installed above the oblique yarn 71. On the other hand, the lower warp 73 is arranged by the lower warp supply unit 63 installed below the oblique yarn 71. The upper warp 72 and the lower warp 73 overlap with the intersection of the oblique yarns 71 and are alternately arranged in the width direction orthogonal to the conveying direction. The upper warp 72 and the lower warp 73 arranged in this way are transported to the heat fusion part 64 together with the oblique yarn 71, and a joining step is performed.

  In the joining step, the oblique yarn 71, the upper warp 72, and the lower warp 73 conveyed to the heat-sealing portion 64 are heated and pressurized from above and below. Thereby, as shown in FIG. 4B, the intersection of the oblique yarns 71 is thermally fused, and the upper warp 72 or the lower warp 73 is thermally fused to the intersection of the oblique yarns 71. A multiaxial nonwoven fabric is obtained.

  The multiaxial nonwoven fabric is used as, for example, a building material, a civil engineering material, an agricultural material, a fishery material, an industrial material, or the like. Specific examples of the use of the multiaxial nonwoven fabric include, for example, concrete peeling prevention materials, riverbed protection nets, cultured shell outflow prevention nets, nets used for pest control, filter casing materials, resin material reinforcements, etc. Is mentioned. In addition, the multiaxial nonwoven fabric can be molded into a cylindrical shape, for example. Moreover, it can also be laminated | stacked and used for multiaxial nonwoven fabrics and another sheet material.

Next, the effect | action of the manufacturing method of a multiaxial nonwoven fabric is demonstrated.
When the supply amount of the yarn to the traverser 41 is not adjusted, the yarn is pulled out from the yarn discharging portion 43 a as the traverser 41 and the conveyance unit 31 are driven. At this time, since tension always acts in the direction in which the yarn is pulled out, the yarn discharged from the yarn discharging portion 43a in the crossing process is not displaced by its own weight. For this reason, for example, the contact is forcibly avoided by using a member that guides the position of the yarn discharged from the yarn discharge portion 43a to the lower side of the yarn discharge portion 43a. In this regard, in the oblique crossing process of the present embodiment, the yarn discharged from the yarn discharge portion 43a is adjacent to the yarn discharge portion 43a in the transport direction by adjusting the supply amount of the yarn to the traverser 41. The yarn is displaced below the yarn discharge portion 43a by utilizing its own weight. In this way, the displacement of the inclined yarn 71a using the own weight of the yarn makes it possible to avoid contact between the yarn discharge portion 43a and the inclined yarn 71a, and therefore, the load on the yarn is suppressed when the contact is avoided. Further, according to the method of displacing the inclined yarn 71a by adjusting the supply amount of the yarn to the traverser 41, it becomes easy to avoid complications around the yarn discharge portion 43a.

  In the crossing step, the yarn discharging portion 43a passes above the yarn discharged by the adjacent yarn discharging portion 43a on the upstream side in the transport direction. Here, the plurality of yarn discharge portions 43a are positioned higher as they are positioned in the transport direction, and the oblique process is performed. For this reason, it becomes easier to avoid contact between the yarn discharge portion 43a and the yarn discharged from the yarn discharge portion 43a located on the upstream side in the transport direction.

Next, the manufacturing apparatus of a multiaxial nonwoven fabric is demonstrated.
As shown in FIGS. 5 and 6, the multiaxial nonwoven fabric manufacturing apparatus includes the above-described transport unit 31 and traverser 41, and further includes a plurality of yarn feeding devices 51, 51... For supplying yarn to the traverser 41. . The amount of yarn supplied to the traverser 41 is adjusted by the rotational drive of each yarn feeding device 51.

  The yarn fed from the creel device 61 is supplied to each yarn feeding device 51. Each yarn feeding device 51 is installed above the traverser 41 so that the yarn is supplied to the traverser 41 by utilizing the weight of the yarn. Each yarn feeding device 51 is provided at a position not interlocked with the reciprocating motion of the traverser 41. Thus, by providing each yarn feeder 51, it becomes difficult to receive the influence of the vibration and impact accompanying the reciprocating motion of the traverser 41.

  The yarn feeding device 51 includes a drive wheel 52 that is rotationally driven through a drive shaft 52 a and a driven wheel 53 that is driven by the drive wheel 52. As shown in FIG. 6, the yarn supplying devices 51 are connected by a common drive shaft 52a, and the driven wheels 53 are connected by a common driven shaft 53a. The drive wheel 52 and the driven wheel 53 sandwich the yarn fed out from the creel device 61, and supply the yarn to the traverser 41 at a predetermined speed by rotating the drive shaft 52a with a drive source such as a servo motor.

  The drive wheel 52 has a clutch mechanism, and releases the rotational drive according to the force applied to forcibly pull out the yarn from the yarn feeding device 51. When the rotational drive is released by this clutch mechanism, the yarn is pulled out from each yarn feeding device 51 at a rotational speed faster than the rotational speed by the rotational drive. As the clutch mechanism, for example, a magnet clutch mechanism using an electromagnet or a permanent magnet, a fluid clutch mechanism using fluid viscosity, or the like can be used.

Next, the operation of the multiaxial nonwoven fabric manufacturing apparatus will be described together with the operation.
Each yarn supplying device 51 adjusts the amount of yarn supplied to the traverser 41 by rotational driving. At this time, since each yarn feeding device 51 is connected by a common drive shaft 52a, each yarn feeding device 51 can be driven by one drive source.

  A yarn is spanned between the thread hooks 12 and 22 by the reciprocating movement of the traverser 41 and the movement of the transport unit 31. At this time, at the time T1 shown in FIG. 3B, the yarn supply speed to the traverser 41 is kept constant by each yarn supplying device 51. At time T1, as the distance D increases, the inclined thread 71a and the distance D become substantially the same. Along with this, tension acts in the direction in which the yarn is pulled out from each yarn feeding device 51. At this time, since each yarn feeding device 51 has a clutch mechanism, the rotational driving is released according to the tension, and the yarn is pulled out from each yarn feeding device 51 at a rotational speed faster than the rotational speed by the rotational driving. As a result, as indicated by time T2 in FIG. 3B, the supply amount (supply speed) of the yarn to the traverser 41 is increased, so that application of excessive tension to the yarn is suppressed.

According to the embodiment described in detail above, the following effects are exhibited.
(1) In the manufacturing method and manufacturing apparatus of the present embodiment, the yarn discharged from the yarn discharging portion 43a is adjusted in the transport direction with respect to the yarn discharging portion 43a by adjusting the supply amount of the yarn to the traverser 41. It displaces using the dead weight of a thread | yarn below the adjacent thread | yarn discharge part 43a. Thus, when avoiding contact between the yarn discharge portion 43a and the inclined yarn 71a, it is easy to suppress a load on the yarn and avoid complications around the yarn discharge portion 43a. Therefore, for example, by suppressing the fuzz of the yarn, the oblique yarn 71 can be easily maintained in a good state, and maintenance of the yarn discharge portion 43a and its surroundings is facilitated.

  (2) Although it becomes easy to avoid contact between the inclined yarn 71a and the yarn discharge portion 43a by the distance A generated by the amount of yarn supplied to the traverser 41, for example, the traverser 41 and the conveyors 13 and 23 are slightly There is a possibility that the yarn discharging portion 43a and the inclined yarn 71a come into contact with each other due to the vertical movement. In this respect, as each yarn discharging portion 43a is positioned in the carrying direction, the oblique crossing step is performed with respect to the carrying portion 31, so that contact between the yarn discharging portion 43a and the inclined yarn 71a is avoided. It becomes even easier.

  (3) Since each yarn supplying device 51 has a clutch mechanism, the supply amount of yarn to the traverser 41 can be increased while suppressing application of excessive tension to the yarn. For this reason, it is possible to suppress the load on the yarn and to avoid complicated control according to the moving speed of the traverser 41. Therefore, for example, it is particularly advantageous when the speed of the transport unit 31 and the traverser 41 is increased to improve production efficiency.

  (4) Each yarn feeding device 51 is provided at a position not interlocked with the reciprocating motion of the traverser 41. According to this structure, since it becomes difficult to receive the influence of the vibration and impact accompanying the reciprocation of the traverser 41, it becomes possible to operate each yarn feeder 51 stably.

  (5) Each yarn feeding device 51 is connected by a common drive shaft 52a. According to this configuration, each yarn feeding device 51 can be driven by one drive source, so that the control of each yarn feeding device 51 is facilitated.

  (6) When the inclined yarn 71a is arranged on the lower warp arranged in advance, the inclined yarn 71a displaced below the yarn discharge portion 43a and the warp are rubbed by utilizing the weight of the yarn, for example, the yarn There is a risk of fluffing. In this respect, according to the method in which the lower warp 73 is arranged along the conveying direction from below the oblique yarn 71 after the oblique step, the contact between the lower warp 73 and the inclined yarn 71a is avoided in the oblique step. Therefore, for example, fuzz of yarn is suppressed.

The embodiment may be modified as follows.
The driven wheel 53 of the yarn supplying device 51 may be omitted, and the yarn may be supplied to the traverser 41 by winding the yarn around the driving wheel 52 that is rotationally driven and has a clutch mechanism as shown in FIG. .

  -The drive wheel 52 which the yarn supplying apparatus 51 has may be changed into the drive wheel which does not have a clutch mechanism. In this case, when a force is applied to forcibly pull out the yarn from the yarn feeding device 51, the yarn is driven between the driving wheel and the driven wheel 53 so that the yarn is slid out between the driving wheel and the driven wheel 53. By adjusting the pressure or selecting the material of the outer periphery of the drive wheel or driven wheel 53, the load on the yarn can be suppressed. However, the driving wheel 52 having the above-described clutch mechanism is advantageous in that the manufacturing conditions can be easily set.

  In the oblique process, the inclined thread 71a is displaced downward in the vicinity of both ends in the moving direction of the traverser 41 as shown in FIGS. 2 (a) and 2 (d). Not limited to this, for example, by increasing the rotational speed of the drive shaft 52a according to the location where the traverser 41 and the conveyors 13 and 23 are likely to slightly move up and down, the location where the inclined thread 71a is displaced downward is increased. It may be set.

  The installation location of each yarn feeding device 51 is not limited to the movement range of the traverser 41 and may be outside the movement range of the traverser 41. In this case, the yarn is installed so that the yarn is supplied to the traverser 41 positioned below the guide rollers positioned below the yarn feeding devices 51.

The yarn feeding device 51 may be interlocked with the reciprocation of the traverser 41 by providing each yarn feeding device 51 in the traverser 41.
Each yarn feeding device 51 is connected by a common drive shaft 52a, but each yarn feeding device 51 may be individually driven by a different drive shaft 52a.

  In the crossing process, the yarn discharge portions 43a that are positioned in the transfer direction are positioned above the transfer portion 31. However, as shown in FIG. The same position may be used. In this case, the distance A generated by adjusting the supply amount of the yarn to the traverser 41 is the interval S between the inclined yarn 71a and the yarn discharge portion 43a. Also by this interval S, when avoiding contact between the yarn discharge portion 43a and the inclined yarn 71a, it is easy to suppress a load on the yarn and avoid complication around the yarn discharge portion 43a.

  In the joining step, the intersection of the oblique yarn 71 and the upper warp 72 or the lower warp 73 are heat-sealed simultaneously, but after the intersection of the oblique yarn 71 is heat-sealed, the intersection and the upper warp 72 or the lower warp 73 may be heat-sealed. Furthermore, the thermal fusion of the intersections of the oblique yarns 71 may be performed in multiple stages.

  In the warp arranging step, the upper warp 72 and the lower warp 73 are alternately arranged in the width direction orthogonal to the conveying direction. In other words, one of the upper warp 72 and the lower warp 73 is arranged at the intersection of the oblique yarn 71, but the upper warp 72 and the lower warp 73 are arranged at the intersection of the oblique yarn 71. Both may be arranged.

  In the warp arranging step, the upper warp 72 and the lower warp 73 are arranged with respect to the oblique yarn 71, but at least one of the upper warp 72 and the lower warp 73 may be omitted. For example, you may change to the polyaxial nonwoven fabric which consists only of the oblique thread 71. FIG. Further, for example, one of the upper warp 72 and the lower warp 73 in the embodiment may be changed to the other.

The warp arranging step of arranging the lower warp 73 before the oblique step may be performed, and the warp arranging step of arranging the upper warp 72 after the oblique step may be performed.
-Although the said crossing process is applied to the process of crossing the thread | yarn which has heat-fusibility, you may be applied to the process of crossing the non-heat-sealable thread | yarn. In this case, the joining step is changed to a step of applying an adhesive and curing the adhesive.

  The traverser 41 is reciprocated along a direction orthogonal to the conveyance direction of the conveyance unit 31, but may be reciprocated along a direction inclined with respect to the conveyance direction and the direction orthogonal to the conveyance direction. Good.

  DESCRIPTION OF SYMBOLS 11 ... 1st thread hook part row | line | column, 12 ... 1st thread hook part, 21 ... 2nd thread hook part row | line | column, 22 ... 2nd thread hook part, 31 ... Conveyance part, 41 ... Traverser, 43a ... Yarn discharge part, 51 ... yarn feeding device, 52a ... drive shaft, 71 ... oblique yarn, 71a ... inclined yarn.

Claims (6)

Conveying provided with a first yarn hooking portion row in which a plurality of first yarn hooking portions are arranged in the carrying direction and a second yarn hooking portion row in which a plurality of second yarn hooking portions are arranged in the carrying direction. And a traverser having a plurality of yarn discharge portions arranged above the transport unit and arranged along the transport direction,
By positioning the plurality of yarn discharge portions below the upper ends of the first yarn hooking portion and the second yarn hooking portion, and reciprocating the traverser along a direction intersecting the conveying direction of the conveying portion. The crossing step is performed in which the yarn is alternately wound around the first yarn hooking portion and the second yarn hooking portion to form an oblique yarn in which the yarn is obliquely crossed in the oblique direction and the reverse oblique direction. later,
A method for producing a multiaxial nonwoven fabric for performing a joining step for joining intersections of the oblique yarns,
The amount of yarn supplied to the traverser when the yarn discharging portion adjacent to the yarn discharging portion in the conveying direction passes above the inclined yarn discharged from the yarn discharging portion in the skewing step. The slanted yarn discharged from the yarn discharge portion is displaced by using the own weight of the yarn below the yarn discharge portion adjacent to the yarn discharge portion in the transport direction. A method for producing a multiaxial nonwoven fabric.   2. The multiaxial nonwoven fabric according to claim 1, wherein the plurality of yarn discharging units are positioned higher than the conveying unit as they are positioned in the conveying direction, and the oblique crossing step is performed. Production method. It is a manufacturing apparatus of the multiaxial nonwoven fabric used for the manufacturing method of the multiaxial nonwoven fabric of Claim 1 or Claim 2, Comprising: The said supply part, the said traverser, and the some yarn feeder which supplies a thread | yarn to the said traverser Prepared,
An apparatus for producing a multiaxial nonwoven fabric, wherein a supply amount of yarn to the traverser is adjusted by rotational driving of the plurality of yarn feeding devices. Each of the plurality of yarn feeding devices includes a drive wheel,
Each drive wheel each have a clutch mechanism, the clutch mechanism, when the force to leave-out forcibly pull the yarn supplied by the rotation of the driving wheel is applied to the yarn, the drive wheel 4. The yarn according to claim 3 , wherein the yarn is pulled out at a rotation speed faster than a rotation speed by the rotation drive in the drive wheel that is configured to be released from the rotation drive and released from the rotation drive. Multiaxial nonwoven fabric manufacturing equipment.   The apparatus for producing a multiaxial nonwoven fabric according to claim 3 or 4, wherein the plurality of yarn feeding devices are provided at positions not interlocked with the reciprocation of the traverser.   The apparatus for producing a multiaxial nonwoven fabric according to any one of claims 3 to 5, wherein the plurality of yarn feeding devices are connected by a common drive shaft.