JP6964575B2 - Sheet member manufacturing method and seat member manufacturing equipment - Google Patents

Description

The present invention relates to a method for manufacturing a seat member and an apparatus for manufacturing a seat member.

Patent Document 1 discloses that a non-woven fabric composite low-density woven fabric in which a woven fabric and a non-woven fabric are entangled is used in order to soften the texture of an absorbent article such as a sanitary napkin or a disposable diaper.

Japanese Unexamined Patent Publication No. 11-170413

However, in the process of manufacturing a non-woven fabric composite low-density woven fabric as shown in Patent Document 1, the fibers constituting the non-woven fabric to be entangled with the woven fabric are light materials and are easily affected from the outside such as during transportation. Unevenness is likely to occur due to the difference between the two, which may spoil the appearance. In particular, the edge of the non-woven fabric is liable to have uneven fiber density, while the end of the woven fabric is less likely to be uneven. When cut in this way, the end portion of the woven fabric is cut off excessively, which may increase the cost.

The present invention has been made in view of the above problems, and reduces the risk of excessively cutting off the woven fabric while reducing the risk of unevenness due to fiber density, thereby providing a sheet member at a lower cost. The purpose is to manufacture.

The main invention for achieving the above object is a method for manufacturing a sheet member for an absorbent article having a woven fabric and a fiber aggregate in a state of being entangled with the woven fabric, and the woven fabric is continuous in the transport direction. After the arrangement step of arranging the fiber aggregate on the side of at least one surface of the woven fabric and the arrangement step, a fluid is sprayed toward the woven fabric and the fiber aggregate to entangle the fiber aggregate with the woven fabric. It has an entanglement step to be woven, and after the entanglement step, a cutting step of cutting both ends of the fiber assembly in the CD direction intersecting the transport direction, and the maximum length of the fiber assembly in the CD direction. Is a method for manufacturing a sheet member, which is characterized by having a length equal to or longer than the length of the woven fabric in the CD direction.
Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.

According to such a method for manufacturing a sheet member, it is possible to reduce the risk of excessively cutting off the woven fabric when the end portion of the fiber assembly in the CD direction, in which the fiber density is difficult to stabilize, is cut in the cutting step. , The sheet member can be manufactured at a lower cost while reducing the risk of unevenness due to the fiber density.

FIG. 1 is a plan view of the sanitary napkin 1 as viewed from the skin side. FIG. 2 is a plan view of the sanitary napkin 1 as viewed from the non-skin side. FIG. 3 is a cross-sectional view taken along the line XX in FIG. FIG. 4 is a partially enlarged view of the surface sheet 3. FIG. 5 is a diagram showing a state in which the surface sheet 3 is separated into the woven fabric 40 and the fiber aggregate 50. FIG. 6 is a diagram schematically showing a part of a manufacturing apparatus 100 used in the method for manufacturing the seat member 70 of the first embodiment. FIG. 7 is a diagram schematically showing the woven fabric 40 and the fiber assembly 50 in the first step. FIG. 8 is a diagram schematically showing a cross section of the first rotating body 150. FIG. 9A is a diagram schematically showing the injection nozzle 302. FIG. 9B is a diagram schematically showing a configuration example of the injection nozzle 302 nozzle hole. FIG. 10 is a diagram schematically showing a cross section of the sheet 60 in A in FIG. 6 in the CD direction. FIG. 11 is a diagram schematically showing a part of the manufacturing apparatus 101 used in the method for manufacturing the seat member 70 of the second embodiment. FIG. 12 is a diagram schematically showing a part of the manufacturing apparatus 102 used in the method for manufacturing the seat member 70 of the third embodiment. FIG. 13 is a diagram schematically showing the water supply device 200.

The description of this specification and the accompanying drawings will clarify at least the following matters.
A method for manufacturing a sheet member for an absorbent article having a woven fabric and a fiber aggregate in a state of being entangled with the woven fabric, wherein the fiber aggregate is on the side of at least one surface of the woven fabric which is continuous in the transport direction. After the placement step of arranging the body, the entanglement step of injecting fluid toward the woven fabric and the fiber assembly to entangle the fiber assembly with the woven fabric, and after the entanglement step, It has a cutting step for cutting both ends of the fiber assembly in the CD direction intersecting the transport direction, and the maximum length of the fiber assembly in the CD direction is the length of the woven fabric in the CD direction. This is a method for manufacturing a sheet member, which is characterized by the above.

According to such a method for manufacturing a sheet member, it is possible to reduce the risk of excessively cutting off the woven fabric when the end portion of the fiber assembly in the CD direction, in which the fiber density is difficult to stabilize, is cut in the cutting step. , The sheet member can be manufactured at a lower cost while reducing the risk of unevenness due to the fiber density.

In the method for manufacturing such a sheet member, in the entanglement step, the fiber aggregate is conveyed at a certain transfer speed by using a certain transfer mechanism, and the fiber is conveyed toward the certain transfer mechanism by using another transfer mechanism. It is desirable that the aggregate is transported at another transport speed, and that the certain transport speed is equal to or higher than the other transport speed.

According to such a method for manufacturing a sheet member, the fibers of the fiber aggregate can be easily moved in the transport direction, and the possibility that the fiber density of the fiber aggregate entangled with the woven fabric becomes uneven can be reduced.

In the method for manufacturing such a sheet member, in the entanglement step, a fluid is injected a plurality of times toward the fabric and the fiber aggregate at different positions in the transport direction, and is jetted on the upstream side in the transport direction. It is desirable that the pressure of is equal to or less than the pressure of the fluid to be injected on the downstream side in the transport direction.

According to such a method for manufacturing a sheet member, the fibers of the fiber aggregate can be entangled with the woven fabric while reducing the risk of being blown off by the injected fluid.

In the method for manufacturing such a sheet member, in the entanglement step, in a state where at least one of the fabric or the fiber aggregate is in contact with the peripheral surface of the rotating body having a suction mechanism, the outer side in the radial direction of the rotating body. It is desirable to inject the fluid inward from.

According to such a method for manufacturing a sheet member, the fibers of the fiber aggregate can be entangled in a wider range of the woven fabric while reducing the risk of unevenness due to the fiber density, so that the sheet member can be manufactured at a lower cost. be able to.

In the method for manufacturing such a sheet member, the arrangement step uses a transport conveyor to transport at least the fiber aggregate, and the entanglement step uses the rotating body to transfer the fabric and the fiber aggregate. Further, the transport surface of the transport conveyor is provided at the same height as the rotation center of the rotating body or at a position higher than the rotation center. It is desirable that the rotating body is conveyed upward along the rotation direction of the rotating body.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate caused by the transportation become uneven.

In the method for manufacturing such a sheet member, the arrangement step uses a transport conveyor to transport at least the fiber aggregate, and the entanglement step uses the rotating body to transfer the fabric and the fiber aggregate. Further, the transport surface of the transport conveyor is provided below the center of rotation of the rotating body, and the rotating body and the transport conveyor are placed between the transport by the transport conveyor and the transport by the rotating body. It is desirable to further have a passing step through which the fiber assembly passes the closest position.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate caused by the transportation become uneven.

In the method of manufacturing such a sheet member, in the transfer by the transfer conveyor, the transfer conveyor does not convey the woven fabric, but before the transfer by the rotating body, a supply step of supplying the woven fabric to the rotating body is performed. It is desirable to have.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate caused by the transportation become uneven.

In the method for manufacturing such a sheet member, it is desirable that the supply rotating body for supplying the woven fabric in the supply step supplies the woven fabric with the tension of the woven fabric kept constant.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fiber density of the fiber aggregate entwined with the woven fabric becomes uneven.

In the method for manufacturing such a sheet member, the peripheral speed of the supply rotating body is equal to the peripheral speed of the rotating body, and the peripheral speed of the rotating body is faster than the moving speed of the conveyor. desirable.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate caused by the transportation become uneven.

In the method for manufacturing such a sheet member, it is desirable to perform a treatment for reducing the thickness of the fiber aggregate before the entanglement step.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate are uneven.

In the method for manufacturing such a sheet member, it is desirable that the treatment for reducing the thickness of the fiber aggregate is a fluid injection treatment.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate are uneven.

In the method for manufacturing such a sheet member, the arrangement step uses a transport conveyor to transport at least the fiber aggregate, and the entanglement step uses the rotating body to transfer the fabric and the fiber aggregate. It is desirable that the treatment for further transporting and reducing the thickness of the fiber aggregate is to pass the fiber aggregate between the opposing transport conveyor and the rotating body.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the fibers of the fiber aggregate are uneven.

According to the method for manufacturing such a sheet member, in the entanglement step, the woven fabric and the fiber aggregate are conveyed by using one of the rotating bodies, and after being conveyed by the rotating body, the woven fabric is conveyed by using a downstream conveying mechanism. It is desirable that the fiber aggregate is transported at a downstream transport speed, and the downstream transport speed is equal to or higher than the peripheral speed of the rotating body.

According to such a method for manufacturing a sheet member, it is possible to reduce the possibility that the woven fabric and the fiber aggregate are loosened while being entangled while being conveyed by using a rotating body.

According to the method for manufacturing the sheet member, the downstream side transfer conveyor is provided with a suction mechanism, and the woven fabric and the fiber aggregate are conveyed at the downstream side transfer speed by using the downstream side transfer conveyor, and the woven fabric and the fiber aggregate are conveyed. It is desirable to inject a fluid toward the fiber aggregate to further entangle the fiber aggregate with the woven fabric.

According to such a method for manufacturing a sheet member, it is possible to manufacture a sheet member in which a large number of fiber aggregates are entangled with the woven fabric.

An apparatus for manufacturing a sheet member for an absorbent article having a woven fabric and a fiber aggregate in a state of being entangled with the woven fabric. An arrangement portion for arranging the body, an entanglement portion for injecting a fluid toward the woven fabric and the fiber aggregate after the arrangement of the fiber aggregate to entangle the fiber aggregate with the woven fabric, and the transport direction. It has a cutting portion for cutting both ends of the fiber assembly in the CD direction intersecting with the above, and the maximum length of the fiber assembly in the CD direction is equal to or greater than the length of the woven fabric in the CD direction. It is a sheet member manufacturing apparatus characterized by having the above.

According to such a sheet member manufacturing apparatus, it is possible to reduce the risk of excessively cutting off the woven fabric when the end portion of the fiber assembly in the CD direction, in which the fiber density is difficult to stabilize, is cut in the cutting step. , The sheet member can be manufactured at a lower cost while reducing the risk of unevenness due to the fiber density.

=== Embodiment ===
<Structure of sanitary napkin 1>
Hereinafter, embodiments will be described by taking a sanitary napkin as an example of the absorbent article of the present invention, but the present invention is not limited to this, and other absorbent articles such as a vaginal discharge sheet, a urine absorbing pad, and a disposable diaper, for example. It is also applicable to.

FIG. 1 is a plan view of a sanitary napkin 1 (hereinafter, also referred to as “napkin 1”) as viewed from the skin side. FIG. 2 is a plan view of the sanitary napkin 1 as viewed from the non-skin side. FIG. 3 is a cross-sectional view taken along the line XX in FIG. The napkin 1 has a front-rear direction, a width direction, and a thickness direction that are orthogonal to each other. In the anterior-posterior direction, the side that contacts the wearer's lower abdomen is called the front side, and the side that contacts the buttocks is called the posterior side. In the thickness direction, the side in contact with the wearer is called the skin side, and the opposite side is called the non-skin side.

As shown in FIGS. 1, 2 and 3, in the napkin 1, a pair of side sheets 5, a front sheet 3, an absorber 2 and a back sheet 4 are laminated in this order from the skin side in the thickness direction. ing. The surface sheet 3 and the absorber 2 are bonded to each other by a known bonding means such as a hot melt adhesive. The front surface sheet 3 and the back surface sheet 4 have a plane size larger than that of the absorber 2 and cover the entire plane surface of the absorber 2. Further, the front surface sheet 3, the back surface sheet 4 and the side sheet 5 laminated to each other are joined to each other via the outer peripheral sealing portion 8 along the outer peripheral edge of the napkin 1. The pair of side sheets 5 are provided on both sides in the width direction, are arranged on the skin side of the surface sheet 3 along the front-rear direction, and are joined to the surface sheet 3 by a known adhesive means or welding means.

The napkin 1 has a pair of wing portions 6 extending from the central region in the front-rear direction of the napkin 1 to both outer sides in the width direction. The wing portion 6 is formed by a side sheet 5 and a back surface sheet 4 extending outward from both side portions in the width direction of the front surface sheet 3. The napkin 1 may be in a form that does not have a wing portion 6.

An adhesive region 11 to which an adhesive is applied is provided on the non-skin side surface of the napkin 1 (non-skin side surface of the back sheet 4). When the napkin 1 is used, the adhesive region 11 is attached to the side surface of the skin such as underwear, and the napkin 1 is fixed to the underwear or the like. The shape and number of the adhesive regions 11 can be arbitrarily changed.

Similarly, the non-skin side surface of each wing portion 6 (non-skin side surface of the back surface sheet 4) is provided with an adhesive region 12 for the wing portion. When the napkin 1 is used, the adhesive region 12 for the wing portion is attached to a non-skin side surface of the underwear or the like, and the napkin 1 is fixed to the underwear or the like. The shape and number of the adhesive regions 12 for the wing portion can be arbitrarily changed.

The surface sheet 3 is liquid permeable and is composed of a woven fabric 40 and a fiber aggregate 50. The back sheet 4 can be formed from a liquid-impermeable and moisture-permeable plastic film, a liquid-impermeable non-woven fabric, a laminated sheet thereof, and the like. A known non-woven fabric can be used for the side sheet 5.

The absorber 2 is a member that absorbs excrement such as menstrual blood and retains it inside, and is an absorbent core 10 that absorbs a liquid and a liquid-permeable core wrap sheet 20 that covers the entire absorbent core 10. have. The absorbent core 10 is formed into a predetermined shape by adding a highly absorbent polymer (so-called SAP) or the like which is a liquid absorbent granular material to pulp fiber or cell roll type absorbent fiber which is a liquid absorbent fiber or the like. There is. The core wrap sheet 20 is a liquid permeable sheet, and examples thereof include tissue and airlaid.

<Structure of surface sheet 3>
FIG. 4 is a partially enlarged view of the surface sheet 3 when viewed from the skin side, and FIG. 5 is a view showing a state in which the surface sheet 3 is separated into a woven fabric 40 and a fiber aggregate 50. As shown in FIGS. 4 and 5, the surface sheet 3 is a sheet member in which the fibers of the woven fabric 40 and the fiber assembly 50 are entangled with each other (the woven fabric 40 and the fiber assembly 50 are entangled) and integrated. be. A method for manufacturing the sheet member 70 in which the woven fabric 40 and the fiber aggregate 50 are entangled will be described later.

As shown in FIG. 4, the woven fabric 40 is composed of constituent yarns 41 woven in a lattice pattern. The constituent yarn 41 has a plurality of warp yarns 42 and a plurality of weft yarns 43 intersecting each other with the warp yarns 42, and is formed by intersecting each other in the thickness direction, and is surrounded by the warp yarns 42 and the weft yarns 43. A plurality of textures 45, which are regions, are formed. The constituent yarn 41 of the woven fabric 40 is a twisted yarn formed by twisting a raw yarn made of cotton yarn (cotton fiber). In addition to cotton fibers, cellulosic fibers such as natural cellulose fibers such as hemp and pulp fibers, regenerated cellulose fibers such as rayon, and semi-synthetic cellulose fibers such as acetate are preferably used as raw yarn materials. The cotton yarn used for the raw yarn is preferably a cotton yarn having a thickness of 10 to 100. By using the woven fabric 40 mainly made of a cotton material or the like for the surface sheet 3, the wearer can obtain a comfortable touch and skin troubles are less likely to occur. The weaving method of the woven fabric 40 is not limited to the plain weave woven in a lattice pattern, and known weaving methods such as twill weave, satin weave, and entwined weave can be appropriately adopted.

The fiber aggregate 50 is made of fibers formed by a known manufacturing method such as a spunbonding method using long fibers or a dry method in which short fibers are carded in a certain direction with a card machine to prepare the fibers to form a web. It is an aggregate and is in a pre-stage state where it is formed into a non-woven fabric. Further, the fiber aggregate 50 is formed of constituent fibers 51 including hydrophilic fibers. The constituent fibers 51 are soft and light materials, and are irregularly collected aggregates. Examples of the hydrophilic fiber include regenerated cellulose fiber such as rayon and fibril rayon, natural cellulose fiber such as cotton and crushed pulp, and semi-synthetic cellulose such as acetate. Further, the fiber aggregate 50 formed by the card method using a card machine is not limited, and the fiber aggregate 50 formed by a method such as an airlaid method, a wet method, a spunbond method, or a melt blown method may be used. The fiber density of the fiber assembly 50 is, for example, 2.8 to 3.5 × 10 ^-3 g / cm ³ , and the basis weight (weight per unit area) is, for example, 20 to 70 g / m ² . .. The thickness of the fiber assembly 50 is, for example, 7 to 20 mm, and the length of the fibers of the fiber assembly 50 is, for example, 1 to 100 mm. The fineness of the fiber assembly 50 is, for example, 0.1 to 6 dtex.

<Manufacturing method of the sheet member 70 of the first embodiment>
The woven fabric 40 in a continuous state and the fiber aggregate 50 manufactured by a fiber assembly manufacturing apparatus (not shown) are entangled and integrated to manufacture a sheet member 70 in a continuous state, and a sheet in a continuous state. The surface sheet 3 is formed by performing a cutting process for forming the member 70 into a predetermined shape. However, the sheet member 70 after production may have unevenness due to the difference in fiber density of the fiber aggregate 50. In this regard, a method for manufacturing the sheet member 70 that reduces unevenness will be described below. In the following description, the woven fabric 40 and the sheet member 70 will be described as a continuous state.

FIG. 6 is a diagram schematically showing a part of a manufacturing apparatus 100 used in the method for manufacturing the seat member 70 of the first embodiment. The manufacturing apparatus 100 is an apparatus for manufacturing a sheet member 70 in which a fiber assembly 50 and a woven fabric 40 are entangled and integrated. The manufacturing apparatus 100 includes an upstream transport device 130, a first rotating body 150 and a first injection device 300, a second rotating body 160 and a second injection device 400, a downstream transport device 140, and a dehydration device 250 from the upstream side in the transport direction. , The cutting device 500 is provided. The manufacturing apparatus 100 conveys the woven fabric 40 and the fiber aggregate 50 in the conveying direction, and the direction orthogonal to the conveying direction is referred to as "CD direction".

<< First transport step >>
The first transport step is a step of transporting at least the fiber assembly 50 using the upstream transport device 130. The upstream transfer device 130 includes an upstream transfer belt 130a (also referred to as a “conveyor”). The upstream side transport belt 130a is a transport unit that transports the woven fabric 40 and the fiber assembly 50 along a predetermined transport path. First, the fiber assembly 50 is placed in contact with the upstream transport belt 130a, and the woven fabric 40 and the fiber assembly 50 are conveyed with the woven fabric 40 placed on the fiber assembly 50. That is, on the upstream side transport belt 130a, the woven fabric 40 is arranged on the upper surface side of the fiber assembly 50 and is conveyed in the transport direction. The step of arranging the fiber aggregate 50 on the side of at least one surface of the woven fabric 40 is also referred to as an "arrangement step".

At this time, the length of the woven fabric 40 in the CD direction is equal to or less than the length of the fiber assembly 50 in the CD direction (W40 ≦ W50), and the length of the woven fabric 40 in the CD direction is the length of the fiber assembly 50 in the CD direction. It is more preferably shorter than the length (W40 <W50). FIG. 7 is a diagram schematically showing the woven fabric 40 and the fiber assembly 50 in the first step. In FIG. 7, for convenience, the woven fabric 40 and the fiber assembly 50 are shown in a separated state, but in the first transport step, the woven fabric 40 is overlapped from above the fiber assembly 50. The woven fabric 40 and the fiber aggregate 50 in FIG. 7 and the like are schematic views, and the thickness of each constituent yarn 41 of the woven fabric 40, the size of the weave 45, the number of fibers of the fiber aggregate 50, the length of the fibers, and the like are shown. Not always accurate. The fiber aggregate 50 is a soft and light linear material, and since it is collected irregularly, its outer shape is not fixed. Therefore, the length of the fiber assembly 50 in the CD direction is set to the maximum length of the fiber assembly 50 in the CD direction. In the following description, the "length of the fiber assembly 50 in the CD direction" means the maximum length of the fiber assembly 50 in the CD direction. When the upstream side transport belt 130a is viewed in a plan view, substantially the entire area of the woven fabric 40 is transported in a state of being placed on the fiber assembly 50. From the first transport step to before the cutting process in the cutting step, the woven fabric 40 is transported while maintaining the relationship that the length W40 in the CD direction of the woven fabric 40 is shorter than the length W50 of the fiber assembly 50 in the CD direction.

The transport surface of the upstream transport belt 130a is provided below the center C150 of the first rotating body 150, and the first rotating body 150 is arranged above the upstream transport device 130. The upstream side transport belt 130a and the outer peripheral surface 150a of the first rotating body 150 have a portion facing each other. The portion where the upstream transport belt 130a and the outer peripheral surface 150a of the first rotating body 150 face each other is the closest position between the upstream transport device 130 and the first rotating body 150. Further, the second rotating body 160 is arranged above the first rotating body 150.

Further, when the woven fabric 40 and the fiber assembly 50 are delivered from the upstream transfer device 130 to the first rotating body 150, the gap between the opposite upstream transfer belt 130a and the outer peripheral surface 150a, that is, the upstream transfer device 130. And the first rotating body 150 are passed through the woven fabric 40 and the fiber assembly 50 at the closest position (passing step). As a result, it is sandwiched between the upstream transport belt 130a and the outer peripheral surface 150a. The woven fabric 40 and the fiber assembly 50 crushed in the thickness direction reduce the thickness of the fiber assembly 50, and the fibers can be settled. As a result, it is possible to reduce the possibility that the fibers move and the fiber density of the fiber assembly 50 is biased.

<< Second transport step >>
The second transport step is a step of entwining the fibers of the fiber aggregate 50 with the woven fabric 40 while further transporting the fiber aggregate 50 and the woven fabric 40 transported in the first transport step by the rotation of the first rotating body 150. be. The step of entwining and entwining the fibers of the fiber assembly 50 with the woven fabric 40 is also referred to as a "entanglement step". The woven fabric 40 and the fiber aggregate 50 in an entangled state are referred to as a sheet 60. The sheet 60 indicates a state from a state in which at least a part of the fiber aggregate 50 is entangled with the woven fabric 40 to a state in which the cutting process is performed in the cutting step described later. In FIG. 6, the seat 60 and the seat member 70 are shown by diagonally downward sloping portions.

In the second transport step, it is preferable that the fabric 40 is transported in a state of being in contact with the outer peripheral surface 150a of the first rotating body 150, and the fiber aggregate 50 is transported on the outermost side with respect to the transport surface. Since the fibers of the fiber assembly 50 have the property of being light and having a high degree of freedom, as shown in FIG. 6, when the fibers of the fiber assembly 50 have a gradient in the transfer path in the transfer from the first transfer step to the second transfer step, In the transfer of the woven fabric 40 and the fiber aggregate 50 from the upstream side transport device 130 to the first rotating body 150, the transport of the fiber aggregate 50 may be delayed or the fiber density may change.

At this point, when the fiber 40 is conveyed in contact with the outer peripheral surface 150a and the fiber assembly 50 is conveyed on the outermost side of the conveying surface, the fiber assembly 50 is lifted from the bottom to the top along the arc of the first rotating body 150. Since the fiber assembly 50 is conveyed to the fiber assembly 50, the outermost surface of the fiber assembly 50 with respect to the conveying surface and the outer surface of the fiber assembly 50 (the surface opposite to the side facing the fabric 40) are constrained. It is transported with a high degree of freedom. Then, the fibers of the fiber assembly 50 are easily transported while being spread along the transport direction. As a result, by injecting high-pressure water f onto the fiber assembly 50 in which the fibers are further spread with respect to the woven fabric 40 by using the first injection device 300, the fibers of the fiber assembly 50 are uniformly applied to the woven fabric 40. It becomes easy to be entangled with each other, and it is possible to easily reduce the unevenness of the fibers of the fiber aggregate 50 generated in the sheet member 70 after production.

In the transfer from the first transfer step to the second transfer step, the peripheral speed of the first rotating body 150 is preferably equal to or higher than the moving speed of the upstream transfer belt 130a, and the peripheral speed of the first rotating body 150 is the upstream transfer. More preferably, it is faster than the moving speed of the belt 130a. If the peripheral speed of the first rotating body 150 is slower than the moving speed of the upstream transport belt 130a, the woven fabric 40 may loosen in the upstream transport device 130, or the fibers placed on the woven fabric 40 may be loosened. The transport of the aggregate 50 is also delayed, and there is a risk that the fiber density will be biased. In order to prevent this, the peripheral speed of the first rotating body 150 is set to be equal to or higher than the moving speed of the upstream transport belt 130a, and the woven fabric 40 is transported with an appropriate tension, and the fiber assembly 50 is also easily transported in the transport direction. Can be in a state. Further, by facilitating the transport of the fiber aggregate 50, it becomes easy to reduce the possibility of uneven fiber density.

FIG. 8 is a diagram schematically showing a cross section of the first rotating body 150. The outer peripheral surface 150a of the first rotating body 150 is continuously driven and rotated in the circumferential direction Dc2 (for example, counterclockwise) with the horizontal axis C150 as the center of rotation. The circumferential direction Dc2 is also a transport direction, and the CD direction is orthogonal to the circumferential direction Dc2. The first rotating body 150 is a substantially cylindrical body, and a plurality of intake holes 151 are provided on the peripheral surface thereof. The inner peripheral side and the outer peripheral side of the first rotating body 150 communicate with each other so that a liquid or a gas can pass through the intake hole 151.

The first rotating body 150 includes a suction mechanism. On the inner peripheral side of the first rotating body 150, a cylindrical partition wall 152 is provided concentrically with the first rotating body 150. On the inner peripheral side of the first rotating body 150, the donut-shaped substantially closed space SP is divided into the first region SP1, the second region SP2, and the third region SP3 in the order of the circumferential direction Dc1 by the plurality of partition walls 153, 153, and 153. It is partitioned. The first region SP1 and the second region SP2 on the upstream side are maintained in a negative pressure state at a pressure lower than the outside air pressure, and the third region SP3 has the same pressure as the outside air pressure, or with the first region SP1 and the second region SP2. The atmospheric pressure value between the outside atmospheric pressure. By putting the first region SP1 and the second region SP2 in a negative pressure state, the woven fabric 40 and the fiber aggregate 50 are sucked and held, and the jetted water f is sucked to the inner peripheral side. The rotation of the first rotating body 150 means a state in which the outer peripheral surface 150a is rotated, and the cylindrical partition wall 152 and the partition walls 153, 153, and 153 are fixed, respectively.

The first injection device 300 is provided on the outer side of the first rotating body 150 in the radial direction. The first injection device 300 includes injection nozzles 301 and 302 in this order from the upstream side in the transport direction. The first injection device 300 injects water f onto the woven fabric 40 held on the outer peripheral surface 150a of the first rotating body 150 and from the outer side to the inner side in the radial direction of the first rotating body 150 with respect to the fiber assembly 50. do.

The injection nozzles 301 and 302 are arranged at different positions in the transport direction. Since the injection nozzles 301 and 302 have almost the same basic configuration, the injection nozzle 302 will be described below. FIG. 9A is a diagram schematically showing the injection nozzle 302. FIG. 9B is a diagram schematically showing a configuration example of the injection nozzle 302 nozzle hole. In FIG. 9A, the first rotating body 150, the injection nozzle 302, the woven fabric 40, the injection nozzle 301 other than the fiber assembly 50, and the like are omitted.

The injection nozzle 302 is arranged perpendicular to the outer peripheral surface 150a of the first rotating body 150, and injects water f at a high pressure toward the first rotating body 150. As shown in FIGS. 9A and 9B, the member 301a of the injection nozzle 302 facing the outer peripheral surface 150a is provided with a plurality of nozzle holes 301b arranged linearly and at a constant pitch parallel to the CD direction. Water f sent from the side of the injection nozzle 302 opposite to the first rotating body side is injected from the plurality of nozzle holes 301b over the entire CD direction of the fabric 40 and the fiber assembly 50. The hole diameter of the nozzle hole 301b is, for example, 50 to 200 μm, and the distance between the centers of the nozzle holes 301b adjacent to each other in the CD direction is, for example, 0.2 to 2.0 mm.

In the first injection device 300, the pressure of the water f injected on the upstream side (injection pressure of the water flow) is preferably equal to or lower than the pressure injected on the downstream side, and more preferably the injection pressure of the water flow on the upstream side is It should be smaller than the injection pressure of the water flow on the downstream side. Specifically, the injection pressure of the water flow of the injection nozzle 301 is smaller than the injection pressure of the water flow of the injection nozzle 302. The injection pressure of each water stream is preferably set within the range of 1.0 to 7.0 MPa.

In a state where the fibers of the fiber assembly 50 are not entangled with the woven fabric 40, the outer surface of the fiber assembly 50 (the surface opposite to the side facing the woven fabric 40) is not constrained, and the degree of freedom is high. Therefore, if the injection pressure of the water flow on the upstream side is increased, the fibers may be blown off by the injected water flow, and the fiber assembly 50 may be damaged or the fiber density of the fiber assembly 50 may be biased. In this respect, the injection pressure of the water flow on the upstream side is set lower to reduce the risk of the fibers being blown off, and the fibers can be more reliably entangled with the woven fabric 40. On the other hand, on the downstream side, since the fibers are entwined with the woven fabric 40 at least in part, it is necessary to further entangle the fiber aggregate 50 with the woven fabric 40. Therefore, by applying a higher water flow injection pressure than the upstream side, it becomes easier to entangle more fibers of the fiber aggregate 50 with the woven fabric 40.

Subsequently, the seat 60 is delivered from the first rotating body 150 to the second rotating body 160, and the seat 60 is conveyed by the rotation of the second rotating body 160. In the second rotating body 160, the outer peripheral surface 160a is continuously driven and rotated in the circumferential direction Dc1 (for example, clockwise) with the horizontal axis C160 as the center of rotation. The circumferential direction Dc1 is also a transport direction, and the CD direction is orthogonal to the circumferential direction Dc1. The second rotating body 160 has the same configuration as the first rotating body 150, and detailed description thereof will be omitted.

The peripheral speed of the second rotating body 160 is preferably equal to or higher than the peripheral speed of the first rotating body 150, and more preferably the peripheral speed of the second rotating body 160 is faster than the peripheral speed of the first rotating body 150. Similar to the relationship between the speeds of the first rotating body 150 and the upstream transport belt 130a, by setting the peripheral speed of the second rotating body 160 to be equal to or higher than the peripheral speed of the first rotating body 150, the fabric is woven on the first rotating body 150. It is possible to reduce the possibility that the 40 is loosened or the transportation of the fiber assembly 50 is delayed.

A second injection device 400 is provided on the outer side of the second rotating body 160 in the radial direction. The second injection device 400 includes injection nozzles 401 and 402 in order from the upstream side in the transport direction, and is in the radial direction of the second rotating body 160 with respect to the sheet 60 held on the outer peripheral surface 160a of the second rotating body 160. Water f is injected from the outside to the inside. The configuration of the injection nozzles 401 and 402 of the second injection device 400 is the same as that of the injection nozzle 302. By injecting water f by the second injection device 400, the sheet 60 can be brought into a state in which the fibers of the fiber assembly 50 are more entangled. At this time, similarly to the first injection device 300, it is more preferable that the injection pressure of the water flow of the water f injected by the injection nozzle 401 on the upstream side is smaller than the injection pressure of the water flow injected by the injection nozzle 402 on the downstream side. .. The second injection device 400 does not necessarily have to be provided, and can be appropriately installed depending on the entangled state of the seat 60. Further, the second rotating body 160 may be subjected to dehydration and drying treatments for sucking the moisture of the sheet 60.

<< Dehydration step >>
After the transfer by rotation of the second rotating body 160, the sheet 60 is transferred from the second rotating body 160 to the downstream transfer device 140, and then transferred to the dehydration device 250. The downstream side transport device 140 includes the downstream side transport belt 140a, receives the sheet 60 conveyed by the rotation of the second rotating body 160, and conveys the sheet 60 toward the dehydrator 250.

The dehydrating device 250 includes a transport belt 250a and a plurality of suction units 250b, and transports the sheet 60 transported from the downstream transport device 140 toward the cutting device 500 by the transport belt 250a. When passing through the plurality of suction portions 250b being conveyed by the transfer belt 250a, the moisture of the sheet 60 on the transfer belt 250a is sucked from the lower side.

<< Cutting step >>
After the dehydration treatment of the sheet 60, a cutting treatment is performed. The sheet 60 is delivered from the dehydrating device 250 to the cutting device 500. The cutting device 500 includes a cutter roll 501 and an anvil roll 502. The cutter roll 501 and the anvil roll 502 are rotating bodies having a drive source such as a motor and rotating around the rotation shafts C501 and 502 in the circumferential direction Dc2 and the circumferential direction Dc1, respectively. Further, the outer peripheral surface of the cutter roll 501 is provided with a plurality of protrusions (not shown). The cutter roll 501 and the anvil roll 502 are arranged so that the rotation shafts C501 and the rotation shafts C502 are oriented in the CD direction and their outer peripheral surfaces are opposed to each other. Then, when the sheet 60 is passed through the roll gap between the drive-rotating cutter roll 501 and the anvil roll 502, the sheet member 70 is manufactured by cutting along the cutting lines S at both ends of the sheet 60 in the CD direction. NS.

FIG. 10 is a diagram schematically showing a cross section of the sheet 60 in A in FIG. 6 in the CD direction. The length of the woven fabric 40 in the CD direction before cutting in the cutting step is shorter than the length of the fiber assembly 50 in the CD direction. Therefore, in the sheet 60 after entanglement, as shown in FIG. 10, the fiber assembly 50 has regions that do not overlap with the woven fabric 40 in the CD direction at both ends in the CD direction. Since the outer shape of the fiber aggregate 50 is not defined, the fiber densities of both ends in the CD direction in the state of the sheet 60 tend to be uneven. Therefore, in the production of the sheet member 70, it is necessary to cut off both ends of the fiber assembly 50 by a predetermined region. On the other hand, since the woven fabric 40 has a shape having a defined outer shape, it does not necessarily have to be cut off like the fiber aggregate 50. Therefore, in order to reduce the risk of the woven fabric 40 being cut off excessively, the length W40 of the woven fabric 40 in the CD direction is set to be less than or equal to the length W50 of the fiber assembly 50 in the CD direction (W40 ≦ W50), and more preferably. By making the length W40 of the woven fabric 40 in the CD direction shorter than the length W50 of the fiber assembly 50 in the CD direction (W40 <W50), both ends of the fiber assembly 50 in which the fiber density is not stable are cut off. Therefore, the risk of excessively cutting off the woven fabric 40 can be reduced. Since the waste material due to the cut-off woven fabric 40 can be reduced, the yield of the woven fabric 40 can be improved, and the sheet member 70 can be manufactured at a lower cost.

<Manufacturing method of the sheet member 70 of the second embodiment>
FIG. 11 is a diagram schematically showing a part of the manufacturing apparatus 101 used in the method for manufacturing the seat member 70 of the third embodiment. The basic configuration of the manufacturing apparatus 101 is the same as that of the manufacturing apparatus 100. The manufacturing apparatus 101 does not convey the woven fabric 40 in the upstream transfer device 130, but the woven fabric 40 is conveyed toward the first rotating body 150 by the rotation of the supply rotating body 180. That is, in the second embodiment, the arrangement step is performed on the outer peripheral surface 150a of the first rotating body 150. In the following description, the same members and the like as the manufacturing apparatus 100 of the first embodiment have the same reference numerals, and the description of the parts common to the first embodiment will be omitted.

<< First transport step >>
In the first transfer step, the upstream transfer device 130 conveys the fiber assembly 50 toward the first rotating body 150, and the supply rotating body 180 supplies the woven fabric 40 to the first rotating body 150 by the rotation. The supply rotating body 180 is a so-called raw fabric roll in which a continuous woven fabric 40 is wound into a roll shape. By transporting the woven fabric 40 using the supply rotating body 180, the upstream transport belt 130a can transport only the fiber aggregate 50, and the transport state in which the fiber density is stabilized can be lengthened. Therefore, it becomes easy to keep the fiber density uniform. The length (W40) of the woven fabric 40 conveyed from the supply rotating body 180 in the CD direction is shorter than the length (W50) of the fiber assembly 50 conveyed by the upstream transfer device 130 in the CD direction (W40 <W50). ).

It is desirable to supply the woven fabric 40 to the first rotating body 150 at a constant speed, but when a raw fabric roll is used as in the supply rotating body 180, the peripheral speed of the supply rotating body 180 is tentatively used. Even if the speed is controlled to be the same as the peripheral speed of the first rotating body 150, the two are not necessarily the same in reality. If these two velocities are not the same, tension variations may occur. Therefore, as shown in FIG. 11, it is preferable to provide the tension control device 800 for the fabric 40 between the supply rotating body 180 and the first rotating body 150.

The tension control device 800 adjusts so that the magnitude of the tension of the woven fabric 40 when supplied to the first rotating body 150 becomes a predetermined value. The tension control device 800 includes a pair of fixed rolls 801 and a dancer roll 802 provided between the pair of fixed rolls 801. The dancer roll 802 is provided so as to be able to reciprocate in the vertical direction, and the dancer roll 802 moves in the vertical direction by its own weight to keep the tension for feeding out the woven fabric 40 constant. By moving the dancer roll 802 in the vertical direction, the error between the peripheral speed of the supply rotating body 180 and the peripheral speed of the first rotating body 150 is absorbed, and the tension of the fabric 40 supplied to the first rotating body 150 is constant. Make it easier to keep. In this way, by providing the tension control device 800, it is possible to prevent the woven fabric 40 from hanging down and to superimpose the woven fabric 40 and the fiber aggregate 50 in a state where the tension is constant, so that the fiber aggregate 50 can be overlapped. It is possible to make it easy to make the fiber density uniform, and to reduce unevenness due to the fiber density of the fiber aggregate 50 of the sheet member 70 after production.

It is preferable that the peripheral speed of the supply rotating body 180 is equal to the peripheral speed of the first rotating body 150. It is possible to reduce the risk that the woven fabric 40 will loosen during transportation. Further, it is preferable that the peripheral speed of the first rotating body 150 is equal to or higher than the moving speed of the upstream transport belt 130a. When the fiber assembly 50 is conveyed by the first rotating body 150 at a speed equal to or higher than the upstream transport belt 130a, the fibers of the fiber assembly 50 are spread in the conveying direction on the outer peripheral surface 150a of the first rotating body 150. It becomes easier to be transported. Therefore, it is easy to alleviate the unevenness of the fiber density of the fiber aggregate 50 that occurs when the fiber aggregate 50 is delivered from the upstream transport belt 130a to the first rotating body 150.

<Manufacturing method of the sheet member 70 of the third embodiment>
FIG. 12 is a diagram schematically showing a part of the manufacturing apparatus 102 used in the method for manufacturing the seat member 70 of the third embodiment. Similar to the manufacturing devices 100 and 101, the manufacturing device 102 is a device for manufacturing the sheet member 70 in which the fiber assembly 50 and the woven fabric 40 in a continuous state are entangled and integrated. The manufacturing apparatus 102 includes an upstream transport device 130 and a water supply device 200, a first rotating body 150 and a first injection device 300, a second rotating body 160 and a second injection device, and a downstream transport device 140 from the upstream side in the transport direction. , A dehydrating device 250, and a cutting device 500. In the following description, the same members and the like as the manufacturing apparatus 100 of the first embodiment have the same reference numerals, and the description of the parts common to the first embodiment will be omitted.

In the manufacturing apparatus 102, it is preferable that the transport surface of the upstream transport belt 130a is provided at a position higher than the shaft C150. By doing so, the height difference when the woven fabric 40 and the fiber assembly 50 are transferred from the upstream transfer belt 130a to the first rotating body 150 can be made smaller, and the gradient generated in the transfer path can be made smaller. Therefore, it becomes easy to reduce the bias of the fiber density of the fiber assembly 50.

<< First transport step >>
In the first transfer step, the woven fabric 40 and the fiber aggregate 50 are transferred from above the woven fabric 40 by using the upstream transfer device 130. The upstream transfer device 130 includes an upstream transfer belt 130a and a roll 130b. At this time, when the upstream side transport belt 130a is viewed in a plan view, the woven fabric 40 is transported in a state where substantially the entire area thereof is covered with the fiber aggregate 50.

The water supply device 200 is a device that injects water f, which is a fluid, and is provided above the upstream transfer belt 130a. FIG. 13 is a diagram schematically showing the water supply device 200. In FIG. 13, the upstream transfer device 130 and the like are omitted. The water supply device 200 supplies water f toward the upstream transport belt 130a to moisten the fiber aggregate 50 transported by the upstream transport belt 130a and reduce the thickness of the fiber aggregate 50. The fibers of the fiber assembly 50 are a light and soft material, and in a flat state, they are in a fluffy state, so that they may move during transportation until the woven fabric 40 is entangled, or the first injection device 300 in a later step may be used. The fibers may be blown off by the pressure of the injection of water f, and the fibers may be partially increased or decreased. Therefore, it is preferable that the fibers are moistened by injecting water f into the fiber aggregates 50 in advance in the first transport step to reduce the thickness of the fiber aggregates 50 so that the fibers are hard to move. That is, since the purpose of the water supply device 200 is to include water in the fiber aggregate 50, the fiber aggregate 50 is not entangled with the woven fabric 40 at this point. As a result, it is possible to reduce the possibility that the fibers of the fiber assembly 50 of the sheet member 70 after production are uneven due to the unevenness of the fiber density during the transportation during the first transportation step. As a method of moistening the fiber aggregate 50 with water, water may be dropped, spray-like water may be sprayed, or the fiber aggregate 50 may be immersed in a container filled with water.

Then, it passes under the roll 130b and is conveyed toward the first rotating body 150. When the fabric 40 and the fiber assembly 50 are delivered from the upstream transfer device 130 to the first rotating body 150, the fiber assembly 50 is passed through the gap between the rolls 130b facing each other and the upstream transfer belt 130a. By sandwiching the fiber assembly 50 between the roll 130b and the upstream transport belt 130a, the fiber assembly 50 may be crushed in the thickness direction to reduce the thickness of the fiber assembly 50 and calm the movement of the fibers. good. As a result, it is possible to reduce the possibility that the fibers move during the first transport step and cause a bias in the fiber density, and reduce the possibility that the fibers of the fiber assembly 50 of the sheet member 70 after production are uneven. can.

<< Second transport step >>
In the second transport step, it is preferable that the fabric 40 is transported in a state of being in contact with the outer peripheral surface 150a of the first rotating body 150, and the fiber aggregate 50 is transported on the outermost side with respect to the transport surface. Since the fibers of the fiber assembly 50 are light and have a high degree of freedom, as shown in FIG. 12, when the transfer path has a gradient in the transfer from the first transfer step to the second transfer step, the fibers are transported on the upstream side. In the vicinity of the roll 130b where the woven fabric 40 and the fiber assembly 50 are delivered from the device 130 to the first rotating body 150, the transfer of the fiber assembly 50 tends to be delayed, and the fiber density may change. When the woven fabric 40 is conveyed in contact with the outer peripheral surface 150a and the fiber assembly 50 is conveyed on the outermost side of the conveying surface, the outer surface of the fiber assembly 50 (the side opposite to the side facing the woven fabric 40). The surface) is not restrained and is transported in a state of high degree of freedom. Therefore, while the first rotating body 150 is used for transportation, the fibers of the fiber assembly 50 can be easily transported while being spread along the transportation direction. As a result, by injecting high-pressure water f onto the fiber assembly 50 in which the fibers are further spread with respect to the woven fabric 40 by using the first injection device 300, the fibers of the fiber assembly 50 are uniformly applied to the woven fabric 40. It becomes easy to be entangled with each other, and it is possible to easily reduce the unevenness of the fibers of the fiber aggregate 50 generated in the sheet member 70 after production.

Subsequently, the sheet is delivered from the first rotating body 150 to the second rotating body 160, and the sheet 60 is conveyed by the rotation of the second rotating body 160. The second injection device 400 injects water f toward the seat 60 from the outside to the inside in the radial direction of the second rotating body 160. The second injection device 400 includes one injection nozzle. By injecting water f by the second injection device 400, the sheet 60 can be brought into a state in which more fibers of the fiber assembly 50 are entwined with the woven fabric 40. It is more preferable that the injection pressure of the water flow to be injected is the smallest in the injection nozzle 301 and is increased in the order of the injection nozzle 302 and the injection nozzle 303. This is because it is possible to reduce the risk of the fibers of the fiber assembly 50 being blown off by the water stream on the upstream side, and to entangle more fibers with the woven fabric 40 on the downstream side.

<< Dehydration step >>
After the transfer by rotation of the second rotating body 160, the sheet 60 is transferred from the second rotating body 160 to the downstream transfer device 140, and then transferred to the dehydrating device 250, as in the first embodiment. Dehydrate.

<< Cutting step >>
After the dehydration treatment of the sheet 60, a cutting treatment is performed. Similar to the first embodiment, the sheet 60 delivered from the dehydrating device 250 is made into a sheet member 70 by cutting both ends in the CD direction along the cutting line S in the cutting device 500 (see FIG. 10). At this time, by making the length W40 of the woven fabric 40 in the CD direction shorter than the length W50 of the fiber assembly 50 in the CD direction (W40 <W50), both ends of the fiber assembly 50 in which the fiber density is not stable in the CD direction. On the other hand, it is possible to reduce the risk of excessively cutting off the woven fabric 40.

=== Other embodiments ===
Although the embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes an equivalent thereof. For example, the following modifications are possible.

In the above-described embodiment, the fiber assembly 50 is entangled with the woven fabric 40 while being conveyed by using the rotating body (first rotating body 150, second rotating body 160), but the present invention is not limited to this. For example, the fiber assembly 50 may be entangled with the woven fabric 40 by injecting a fluid toward the transport belt while transporting using a horizontal transport belt.

Further, in the above-described embodiment, in the second transport step, the woven fabric 40 and the fiber assembly 50 are transported using the first rotating body 150 and the second rotating body 160, but the present invention is not limited to this. For example, after performing the entanglement process while transporting using the first rotating body 150, the first rotating body 150 may be transported as it is to the downstream transport device 140, or all the steps (from the first transport step to the cutting step) may be performed. , May be performed on a transport device having a transport belt. When the second rotating body 160 is not provided, it is preferable that the carrying speed of the downstream side conveying device 140 is equal to or higher than the peripheral speed of the first rotating body 150. As a result, it is possible to reduce the possibility that the woven fabric 40 transported on the first rotating body 150 is loosened or the fiber assembly 50 is delayed in transportation. Further, when the second rotating body 160 is provided, regardless of whether or not the second rotating body 160 is provided, the downstream side conveying device 140 is provided with a suction mechanism, and the sheet 60 (woven fabric 40 and the fiber assembly 50) is provided by using the downstream side conveying device 140. The woven fabric 40 and the fiber aggregate 50 may be entangled while being conveyed.

Further, in the above-described embodiment, the fabric 40 is placed on the fiber assembly 50 in the placement step, but the present invention is not limited to this. In the arrangement step, the fiber aggregate 50 may be placed on the woven fabric 40 and conveyed to the entanglement step.

In the above-described embodiment, the thickness of the fiber assembly 50 is reduced by using a water supply device 200, a roll 130b, or the like, but the structure may not necessarily include the water supply device 200, or the roll 130b and the upstream. It is not necessary to have a structure in which the side transport belt 130a and the side transport belt 130a face each other with the fiber aggregate 50 interposed therebetween. Further, it may be configured to include either the water supply device 200 or the roll 130b. By providing either one, the thickness of the fiber assembly 50 can be further reduced.

In the above-described embodiment, the first injection device 300 is provided with a plurality of injection nozzles, but the present invention is not limited to this. For example, the first injection device 300 may be provided with one injection nozzle, or a plurality of injection devices for injecting a water stream toward the first rotating body 150 may be provided. Further, the number of injection nozzles provided in the first injection device 300 can be arbitrarily changed. The same applies to the second injection device 400.

Further, in the above-described embodiment, water f is used as the fluid to be injected from the first injection device 300 and the second injection device 400, but the present invention is not limited to this. For example, it may be a gas, not limited to water, and may be a liquid having a predetermined component or viscosity.

1 Sanitary napkin (napkin, absorbent article), 2 absorber, 3 front sheet (sheet member), 4 back sheet, 5 side sheet, 6 wing part, 8 outer peripheral seal part, 10 absorbent core, 11 adhesive area, 12 Adhesive area for wing part, 20 core wrap sheet, 40 woven fabric, 41 constituent yarn, 42 warp, 43 weft, 45 weave, 50 fiber aggregate, 51 constituent fiber, 60 sheet, 70 sheet member, 100 manufacturing equipment, 101 Manufacturing equipment, 102 Manufacturing equipment, 120 Direction change roll, 130 Upstream side transfer device, 130a Upstream side transfer belt (conveyance conveyor, other transfer mechanism), 130b roll, 140 Downstream side transfer device, 140a Downstream side transfer belt, 150 1st rotating body (rotating body, a certain transport mechanism), 150a outer peripheral surface, 151 intake hole, 152 cylindrical partition wall, 153 partition wall, 160 2nd rotating body, 160a outer peripheral surface, 180 supply rotating body, 200 water supply device, 250 Dehydrator, 250a Conveyor Belt, 250b Suction Unit, 300 First Injection Device, 301 Injection Nozzle, 302 Injection Nozzle, 303 Injection Nozzle, 400 Second Injection Device, 401 Injection Nozzle, 402 Injection Nozzle, 500 Cutting Device, 501 Cutter Roll , 502 anvil roll, 800 tension controller, 801 fixed roll, 802 dancer roll, f water, S cutting line, SP almost closed space

Claims (15)

A method for manufacturing a sheet member for an absorbent article having a woven fabric and a fiber aggregate in a state of being entangled with the woven fabric.
An arrangement step of arranging the fiber aggregate on the side of at least one surface of the woven fabric continuous in the transport direction, and
After the placement step, an entanglement step of injecting a fluid toward the woven fabric and the fiber aggregate to entangle the fiber aggregate with the woven fabric.
The entanglement step is followed by a cutting step of cutting both ends of the fiber assembly in the CD direction intersecting the transport direction.
A method for producing a sheet member, wherein the maximum length of the fiber aggregate in the CD direction is equal to or greater than the length of the woven fabric in the CD direction. In the method for manufacturing a sheet member according to claim 1,
In the entanglement step, the fiber assembly is transported at a certain transport speed using a certain transport mechanism.
The fiber aggregate is transported to the certain transport mechanism at another transport speed by using another transport mechanism.
A method for manufacturing a sheet member, wherein a certain transport speed is equal to or higher than the other transport speed. In the method for manufacturing a sheet member according to claim 1 or 2.
In the entanglement step
The fluid is sprayed a plurality of times toward the woven fabric and the fiber aggregate at different positions in the transport direction.
A method for manufacturing a sheet member, wherein the pressure of the fluid injected on the upstream side in the transport direction is equal to or lower than the pressure of the fluid jetted on the downstream side in the transport direction. The method for manufacturing a sheet member according to any one of claims 1 to 3.
In the entanglement step
A sheet characterized by injecting a fluid from the outside to the inside in the radial direction of the rotating body in a state where at least one of the woven fabric or the fiber aggregate is in contact with the peripheral surface of the rotating body having a suction mechanism. Manufacturing method of parts. The method for manufacturing a sheet member according to claim 4.
In the placement step, at least the fiber assembly is conveyed using a transfer conveyor.
In the entanglement step, the rotating body is used to further convey the woven fabric and the fiber assembly.
The transport surface of the conveyor is provided at the same height as the center of rotation of the rotating body or at a position higher than the center of rotation.
A method for manufacturing a sheet member, characterized in that the fiber aggregate is conveyed upward along the rotation direction of the rotating body immediately after the start of transportation by the rotating body. In the method for manufacturing a sheet member according to claim 4,
In the placement step, at least the fiber assembly is conveyed using a transfer conveyor.
In the entanglement step, the rotating body is used to further convey the woven fabric and the fiber assembly.
The conveyor surface of the conveyor is provided below the center of rotation of the rotating body.
Between the transfer by the transfer conveyor and the transfer by the rotating body,
A method for manufacturing a sheet member, further comprising a passing step through which the fiber aggregate passes at the closest position between the rotating body and the transport conveyor. In the method for manufacturing a sheet member according to claim 6,
In the transfer by the transfer conveyor, the transfer conveyor does not convey the woven fabric,
A method for manufacturing a sheet member, which comprises a supply step of supplying the woven fabric to the rotating body before the transportation by the rotating body. In the method for manufacturing a sheet member according to claim 7,
A method for manufacturing a sheet member, characterized in that, in the supply step, the supply rotating body for supplying the woven fabric supplies the woven fabric with the tension of the woven fabric kept constant. In the method for manufacturing a sheet member according to claim 8,
The peripheral speed of the supply rotating body is equal to the peripheral speed of the rotating body,
A method for manufacturing a sheet member, wherein the peripheral speed of the rotating body is faster than the moving speed of the conveyor. In the method for manufacturing a sheet member according to any one of claims 1 to 9,
A method for manufacturing a sheet member, which comprises performing a process for reducing the thickness of the fiber aggregate before the entanglement step. In the method for manufacturing a sheet member according to claim 10,
A method for manufacturing a sheet member, wherein the treatment for reducing the thickness of the fiber aggregate is a fluid injection treatment. In the method for manufacturing a sheet member according to claim 10,
In the placement step, at least the fiber assembly is conveyed using a transfer conveyor.
In the entanglement step, the rotating body is used to further convey the woven fabric and the fiber assembly.
A method for manufacturing a sheet member, characterized in that a process for reducing the thickness of the fiber aggregate is to pass the fiber aggregate between the opposing conveyor and the rotating body. In the method for manufacturing a sheet member according to any one of claims 1 to 12,
In the entanglement step, one rotating body is used to convey the woven fabric and the fiber assembly.
After the transfer by the rotating body, the woven fabric and the fiber aggregate are conveyed at the downstream transfer speed by using the downstream transfer mechanism.
A method for manufacturing a sheet member, wherein the downstream transport speed is equal to or higher than the peripheral speed of the rotating body. The method for manufacturing a sheet member according to claim 13.
The downstream transfer mechanism includes a suction mechanism.
While transporting the woven fabric and the fiber aggregate at the downstream transport speed using the downstream transport mechanism, a fluid is jetted toward the woven fabric and the fiber aggregate to further transfer the fiber aggregate to the woven fabric. A method for manufacturing a sheet member, which is characterized by being entangled. An apparatus for manufacturing a sheet member for an absorbent article having a woven fabric and a fiber aggregate in a state of being entangled with the woven fabric.
An arrangement portion for arranging the fiber aggregate on the side of at least one surface of the woven fabric continuous in the transport direction,
After the arrangement of the fiber aggregates, a confounding portion that injects a fluid toward the woven fabric and the fiber aggregates to entangle the fiber aggregates with the woven fabric.
It has a cutting portion for cutting both ends of the fiber assembly in the CD direction intersecting the transport direction.
An apparatus for manufacturing a sheet member, characterized in that the maximum length of the fiber aggregate in the CD direction is equal to or greater than the length of the woven fabric in the CD direction.

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