TWI807132B - Sheet member manufacturing method and sheet member manufacturing apparatus - Google Patents

Abstract

[Problem] The purpose is to reduce concerns about occurrence of non-uniformity due to fiber density and reduce concerns about excessive cutting of fabrics, and to manufacture sheet members at a lower cost. [Solution] A method of manufacturing a sheet member (70), comprising: a sheet member (70) for absorbent articles comprising a fabric (40) and a fiber assembly (50) in a state intertwined with the fabric (40), characterized by: a step of arranging the fiber assembly (50) on at least one side of the fabric (40) continuous in the conveying direction; after the arranging step, jetting a fluid toward the fabric (40) and the fiber assembly (50) to allow the fibers to assemble an intertwining step in which the body (50) and the fabric (40) are intertwined; and a cutting step in which, after the intertwining step, both ends of the fiber aggregate (50) in the CD direction intersecting with the conveying direction are cut, the maximum length in the CD direction of the fiber aggregate (50) is greater than or equal to the length in the CD direction of the fabric (40).

Description

Sheet member manufacturing method and sheet member manufacturing apparatus

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

Patent Document 1 discloses the use of a nonwoven composite low-density fabric in which woven fabrics and nonwoven fabrics are entangled in order to make absorbent articles such as sanitary napkins and disposable diapers soft to the touch.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 11-170413

However, in the manufacturing process of the nonwoven composite low-density fabric shown in Patent Document 1, the fibers constituting the nonwoven fabric intertwined with the fabric are light materials, and since they are easily affected by external influences such as during transportation, unevenness due to the difference in fiber density is likely to occur, and there is a concern that the appearance will be spoiled. In particular, the end of the non-woven fabric is In addition to the fact that uneven density is easy to occur, because the end of the fabric is not easy to produce, so in the manufacturing process of the non-woven composite low-density fabric, if the end of the fabric is cut to be the same as the end of the non-woven fabric, excessively cutting off the end of the fabric may increase the cost.

The present invention was developed in view of the above-mentioned problems, and aims to reduce the concern of unevenness caused by fiber density and to reduce the concern of excessive cutting of fabrics, and to manufacture sheet members at a lower cost.

The main invention for achieving the above object is a method of manufacturing a sheet member, which is a method of manufacturing a sheet member for an absorbent article having a fabric and a fiber assembly in a state intertwined with the fabric, characterized by comprising: an arranging step of arranging the fiber assembly on at least one surface side of the continuous fabric in the conveying direction; after the arranging step, an entanglement step of jetting a fluid toward the fabric and the fiber assembly to entangle the fiber aggregate and the woven fabric; In the step of cutting both ends of the fiber aggregate in the CD direction, 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.

Other characteristics of the present invention will be apparent from the descriptions in this specification and the attached pages.

According to the manufacturing method of such a sheet member, when cutting the end portion of the CD direction of the fiber aggregate whose fiber density is not easily stabilized in the cutting step, since the worry of excessively cutting off the fabric can be reduced, the concern of non-uniformity caused by the fiber density can be alleviated, and the sheet member can be manufactured at a lower cost.

[Mode for Carrying Out the Invention]

From the description in this manual and the attached pages, at least the following matters are clear. A method for manufacturing a sheet member, which is a method for manufacturing a sheet member for an absorbent article having a fabric and a fiber assembly intertwined with the fabric, comprising: arranging the fiber assembly on at least one surface side of the web continuous in the conveying direction; after the arranging step, spraying a fluid toward the fabric and the fiber aggregate to entangle the fiber aggregate and the fabric; and after the entangling step, cutting the fiber aggregate in a CD direction intersecting the conveying direction In the step of cutting both ends, 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.

According to the manufacturing method of such a sheet member, when cutting the end portion of the CD direction of the fiber aggregate whose fiber density is not easily stabilized in the cutting step, since the worry of excessively cutting off the fabric can be reduced, the concern of non-uniformity caused by the fiber density can be alleviated, and the sheet member can be manufactured at a lower cost.

Such a method for manufacturing a sheet member, wherein, in the intertwining step, the fiber aggregate is conveyed at a certain conveying speed by using one of the conveying mechanisms, and the fiber aggregate is conveyed toward the one conveying mechanism at another conveying speed by using the other conveying mechanism, and it is desirable that the certain conveying speed is greater than or equal to the other conveying speed.

According to the manufacturing method of such a sheet member, the fibers of the fiber aggregate can be easily moved in the conveying direction, and the concern about the unevenness of the fiber density of the fiber aggregate intertwined with the fabric can be alleviated.

In the manufacturing method of such a sheet member, in the entanglement step, the fluid is sprayed toward the fabric and the fiber assembly a plurality of times at different positions in the conveying direction, and the pressure of the fluid sprayed on the upstream side of the conveying direction is preferably equal to or lower than the pressure of the fluid sprayed on the downstream side of the conveying direction.

According to such a method of manufacturing a sheet member, the possibility of the fibers of the fiber assembly being blown away by the injected fluid can be alleviated, and it can be more intertwined with the fabric.

A method of manufacturing such a sheet member. Here, in the entanglement step, it is desirable to jet the fluid from the radially outer side toward the inner side of the rotating body in a state where at least one of the fabric or the fiber aggregate is brought into contact with the peripheral surface of the rotating body having a suction mechanism.

According to the manufacturing method of such a sheet member, since the fear of occurrence of non-uniformity due to the fiber density is alleviated, and the fibers of the fiber aggregate and the fabric can be entangled in a wider range, it can be manufactured at a lower cost.

In the manufacturing method of such a sheet member, in the arranging step, at least the fiber aggregate is conveyed using a conveyor belt, and in the interlacing step, the fabric and the fiber aggregate are further conveyed using the rotating body, the conveying surface of the conveyor belt is set at the same height as the center of rotation of the rotating body, or at a position higher than the center of rotation, and it is desired that the fiber aggregate is conveyed upward along the rotation direction of the rotating body after the conveyance by the rotating body is started.

According to such a method of manufacturing a sheet member, concerns about non-uniformity of the fibers of the fiber aggregate due to conveyance can be alleviated.

In the manufacturing method of such a sheet member, in the arranging step, at least the fiber aggregate is conveyed using a conveyor belt, and in the interlacing step, the fabric and the fiber aggregate are further conveyed using the rotary body, the conveying surface of the conveyor belt is located below the rotation center of the rotary body, and it is desirable to further include a passing step in which the fiber aggregate passes through the closest position between the rotary body and the conveyor belt between the conveyance by the conveyor belt and the conveyance by the rotary body.

According to such a method of manufacturing a sheet member, concerns about non-uniformity of the fibers of the fiber aggregate due to conveyance can be alleviated.

In the manufacturing method of such a sheet member, it is desirable to have a supply step of supplying the web to the rotating body before the conveying by the conveying conveyor without conveying the web by the conveying conveyor.

According to such a method of manufacturing a sheet member, concerns about non-uniformity of the fibers of the fiber aggregate due to conveyance can be alleviated.

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

According to such a method of manufacturing a sheet member, concerns about occurrence of unevenness in fiber density of the fiber aggregate intertwined with the woven fabric can be alleviated.

In the manufacturing method of 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 preferably a speed equal to or higher than the moving speed of the conveying belt.

According to such a method of manufacturing a sheet member, concerns about non-uniformity of the fibers of the fiber aggregate due to conveyance can be alleviated.

In such a method for producing 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 of manufacturing a sheet member, concerns about occurrence of unevenness in the fibers of the fiber aggregate can be alleviated.

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

According to such a method of manufacturing a sheet member, concerns about occurrence of unevenness in the fibers of the fiber aggregate can be alleviated.

In the manufacturing method of such a sheet member, in the arranging step, at least the fiber aggregate is transported using a conveyor belt, and in the entanglement step, the fabric and the fiber aggregate are further transported using a rotating body to reduce the thickness of the fiber aggregate, and it is desirable to pass the fiber aggregate between the opposing conveyor belt and the rotating body.

According to such a method of manufacturing a sheet member, concerns about occurrence of unevenness in the fibers of the fiber aggregate can be alleviated.

In the manufacturing method of such a sheet member, in the entanglement step, the fabric and the fiber aggregate are conveyed using one of the rotating bodies, and after the conveyance by the rotating body, the fabric and the fiber aggregate are conveyed at a downstream conveying speed by a downstream conveying mechanism, and the downstream conveying speed is equal to or higher than the peripheral speed of the rotating body.

According to such a method of manufacturing a sheet member, it is possible to reduce concerns about slack in the fabric and fiber aggregates during intertwining while being transported using the rotating body.

In the manufacturing method of such a sheet member, wherein the downstream conveying belt is provided with a suction mechanism, and while conveying the fabric and the fiber assembly using the downstream conveying mechanism at the downstream conveying speed, it is desirable to spray a fluid toward the fabric and the fiber aggregate to further entangle the fiber aggregate and the fabric.

According to such a method of manufacturing a sheet member, it is possible to manufacture a sheet member in a state where more fiber aggregates and woven fabrics are entangled.

A manufacturing apparatus of a sheet member, which is a sheet member manufacturing apparatus for absorbent articles having a fabric and a fiber aggregate intertwined with the fabric, comprising: an arrangement portion for arranging the fiber aggregate on at least one surface side of the fabric continuous in the conveyance direction; an entanglement portion for jetting a fluid toward the fabric and the fiber aggregate after the arrangement of the fiber aggregate to entangle the fiber aggregate and the fabric; and cutting both ends of the fiber aggregate in a CD direction intersecting the conveyance direction. In the cut portion, it is desirable that the maximum length of the fiber aggregate in the CD direction is equal to or greater than the length of the fabric in the CD direction.

According to such a manufacturing apparatus of a sheet member, when cutting the CD-direction end portion of the fiber aggregate whose fiber density is not easily stabilized in the cutting step, since the worry of excessively cutting off the fabric can be reduced, the concern of non-uniformity caused by the fiber density can be alleviated, and the sheet member can be manufactured at a lower cost.

===Implementation form=== <Structure of sanitary napkin 1> Hereinafter, an embodiment of the absorbent article of the present invention will be described by taking sanitary napkins as an example, but it is not limited thereto, and it is also applicable to other absorbent articles such as secretion sheets, urine absorbing pads, and disposable diapers.

Fig. 1 is a plan view of a sanitary napkin 1 (hereinafter, also referred to as "sanitary napkin 1") viewed from the skin side. Fig. 2 is a plan view of the sanitary napkin 1 viewed from the non-skin side. Fig. 3 is a cross-sectional view along line X-X in Fig. 1 . The sanitary napkin 1 has a front-back direction, a width direction, and a thickness direction that are perpendicular to each other. In the front-rear direction, the side contacting the wearer's lower abdomen is referred to as the front side, and the side contacting the buttocks is referred to as the rear side. In the thickness direction, the side contacting the wearer is called the skin side, and the opposite side is called the non-skin side.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the sanitary napkin 1 has a pair of side sheets 5 , a top sheet 3 , an absorber 2 , and a back sheet 4 sequentially laminated from the skin side in the thickness direction. 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 surface sheet 3 and the back sheet 4 are larger in plane size than the absorber 2 and cover the absorber 2 as a whole. In addition, the top sheet 3 , back sheet 4 , and side sheet 5 laminated on each other are joined to each other through the outer peripheral seal portion 8 along the outer peripheral edge of the sanitary napkin 1 . A pair of side sheets 5 are provided on both sides in the width direction, are arranged on the skin side of the top sheet 3 along the front-rear direction, and are bonded to the top sheet 3 using known bonding means or fusing means.

The sanitary napkin 1 has a pair of wing portions 6 extending from a central region in the front-rear direction of the sanitary napkin 1 toward both outer sides in the width direction. The wings 6 are formed by the side sheet 5 and the back sheet 4 extending outward from both sides in the width direction of the front sheet 3 . In addition, the form which does not have the wing part 6 may be sufficient as the sanitary napkin 1.

The non-skin side of the sanitary napkin 1 (the non-skin side of the back sheet 4) is provided with an adhesive region 11 coated with an adhesive. The adhesive region 11 is stuck to the side of the skin such as underwear when the sanitary napkin 1 is used, and fixes the sanitary napkin 1 to the underwear or the like. The shape and number of the adhesive regions 11 can be changed arbitrarily.

Similarly, an adhesive region 12 for wings is provided on the non-skin side of each wing 6 (the non-skin side of the back sheet 4 ). The adhesive region 12 for the wings is stuck to the non-skin side of the underwear or the like when the sanitary napkin 1 is used, so as to fix the sanitary napkin 1 to the underwear or the like. The shape and number of the adhesive regions 12 for wing portions can be changed arbitrarily.

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

The absorbent body 2 is a member that absorbs excrement such as menstrual blood and holds it therein, and includes an absorbent core 10 that absorbs liquid, and a liquid-permeable core wrap sheet 20 that wraps the entire absorbent core 10 . The absorbent core 10 is formed into a predetermined shape by adding a superabsorbent polymer (so-called SAP) or the like as liquid-absorbent particulate matter to pulp fibers, cellulose-based absorbent fibers, or the like as liquid-absorbent fibers. The core clad sheet 20 is a liquid-permeable sheet, and examples thereof include tissue paper, air-laid, and the like.

<Structure of surface sheet 3> FIG. 4 is an enlarged view of a part of the top sheet 3 viewed from the skin side, and FIG. 5 shows a state in which the top sheet 3 is separated into a fabric 40 and a fiber assembly 50 . As shown in FIGS. 4 and 5 , the surface sheet 3 is an integral sheet member formed by intertwining the fibers of the fabric 40 and the fiber aggregate 50 (the fabric 40 and the fiber aggregate 50 are entangled). The manufacturing method of the sheet member 70 in which the fabric 40 and the fiber aggregate 50 are entangled will be described later.

As shown in FIG. 4 , the fabric 40 is composed of constituent yarns 41 woven in a lattice. The constituent yarn 41 has: a plurality of warp yarns 42 and a plurality of weft yarns 43 intersecting with the warp yarns 42, which are formed by intersecting each other in the thickness direction, and a plurality of weaves 45 surrounded by the warp yarns 42 and the weft yarns 43 as penetrating regions are formed. The constituent yarn 41 of the fabric 40 is a twisted yarn formed by twisting a raw yarn made of cotton yarn (cotton fiber). As the material of the raw yarn, other than cotton fibers, natural cellulose fibers such as hemp and pulp fibers, regenerated cellulose fibers such as rayon, and cellulose-based fibers such as semi-synthetic cellulose fibers such as acetate, are suitably used. As far as the cotton yarn used for the raw yarn is concerned, it is ideal to use a cotton yarn with a thickness of 10~100. By using the fabric 40 mainly made of cotton material etc. for the surface sheet 3, the wearer can obtain a comfortable touch on the skin, and skin problems are less likely to occur. In addition, the weave method of the fabric 40 is not limited to the plain weave which is woven in a grid pattern, Well-known weave methods, such as twill weave, satin weave, and rib weave, can be suitably used.

The fiber aggregate 50 is an aggregate of fibers formed by a well-known manufacturing method such as a dry method in which long fibers are carded in a certain direction with a carding machine in a spunbond method using long fibers, and the fibers are arranged to form a fiber web, that is, the state before being formed into a nonwoven fabric. Also, the fiber aggregate 50 is formed of constituent fibers 51 containing hydrophilic fibers. The constituent fibers 51 are soft and light materials, and are irregularly aggregated aggregates. Examples of the hydrophilic fiber include regenerated cellulose fibers such as rayon and fibrillated rayon, natural cellulose fibers such as cotton and pulverized pulp, and semi-synthetic cellulose such as acetate. Also, not limited to the fiber assembly 50 formed by the carding method using a carding machine, the fiber assembly 50 formed by methods such as air forming, wet method, spunbonding method, and melt blowing method may also 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. Moreover, the fineness of the fiber aggregate 50 is set to 0.1-6 dtex, for example.

<Manufacturing method of the sheet member 70 of the first embodiment> Fabric 40 in a continuous state is produced by interlacing with fiber aggregates 50 produced by a fiber aggregate manufacturing apparatus (not shown) to form an integrated continuous sheet member 70, and a carding process is applied to form the continuous sheet member 70 into a predetermined shape to form the surface sheet 3. However, the manufactured sheet member 70 may be uneven due to the difference in fiber density of the fiber aggregate 50 . In this regard, a method of manufacturing the sheet member 70 that reduces unevenness will be described below. In addition, in the following description, the fabric 40 and the sheet member 70 are demonstrated in the continuous state.

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

＜＜1st conveying step＞＞ The first conveying step is a step of conveying at least the fiber aggregate 50 using the upstream conveying device 130 . The upstream conveying device 130 includes an upstream conveying belt 130a (also referred to as a "conveying conveyor"). The upstream conveying belt 130a is a conveying unit that conveys the fabric 40 and the fiber aggregate 50 along a predetermined conveying path. First, the fiber aggregate 50 is placed in contact with the upstream conveyor belt 130a, and the fabric 40 and the fiber aggregate 50 are conveyed while the fabric 40 is further placed thereon. That is, on the upstream conveyor belt 130a, the fabric 40 is arranged on the upper surface side of the fiber aggregate 50, and is conveyed in the conveying direction. The step of arranging the fiber aggregate 50 on at least one side of the fabric 40 is also referred to as "arranging step".

At this time, the length in the CD direction of the fabric 40 is not more than the length in the CD direction of the fiber assembly 50 (W40≦W50), and the length in the CD direction of the fabric 40 is preferably shorter than the length in the CD direction of the fiber assembly 50 (W40<W50). FIG. 7 is a diagram schematically showing the fabric 40 and the fiber assembly 50 in the first step. In FIG. 7 , although the fabric 40 and the fiber assembly 50 are shown in a separated state for convenience, the fabric 40 is laminated from above the fiber assembly 50 in the first conveying step. The fabric 40 and fiber assembly 50 in FIG. 7 etc. are schematic diagrams, and the thickness of each constituent yarn 41 of the fabric 40, the size of the mesh 45, the number of fibers in the fiber assembly 50, and the length of the fibers are not necessarily correct. The fiber aggregate 50 is a soft and light linear material, and its shape is not fixed because it is gathered irregularly. Therefore, the length in the CD direction of the fiber aggregate 50 is the maximum length in the CD direction of the fiber aggregate 50 . In addition, in the following description, "the length of the CD direction of the fiber assembly 50" means the maximum length of the fiber assembly 50 in the CD direction. When viewed from above, the upstream conveyor belt 130a is conveyed in a state where substantially the entire area of the fabric 40 is placed on the fiber aggregate 50 . In addition, from the first conveying step to before the cutting process in the cutting step, the fabric 40 is conveyed while maintaining a relationship in which the length W40 in the CD direction of the fabric 40 is longer than the length W50 in the CD direction of the fiber aggregate 50 .

The conveying surface of the upstream conveying belt 130 a is provided below the center C150 of the first rotating body 150 , and the first rotating body 150 is disposed above the upstream conveying device 130 . The upstream conveyor belt 130 a has a portion facing the outer peripheral surface 150 a of the first rotating body 150 . The portion where the upstream conveying belt 130a faces the outer peripheral surface 150a of the first rotating body 150 is the closest position between the upstream conveying device 130 and the first rotating body 150 . Moreover, the second rotating body 160 is disposed above the first rotating body 150 .

Also, when the fabric 40 and the fiber aggregate 50 are delivered from the upstream conveying device 130 to the first rotating body 150, the fabric 40 and the fiber aggregate 50 pass through the gap between the opposing upstream conveying belt 130a and the outer peripheral surface 150a, that is, pass through the closest position between the upstream conveying device 130 and the first rotating body 150 (passing step). Thereby, it is sandwiched between the upstream conveyor belt 130a and the outer peripheral surface 150a. The fabric 40 and the fiber assembly 50 are crushed in the thickness direction, and the thickness of the fiber assembly 50 becomes thinner, and the fibers thereof can be stabilized. Thereby, it is possible to reduce the fear of the fiber density variation of the fiber assembly 50 due to the movement of the fibers.

＜＜Second transport step＞＞ The second conveying step is a step of interlacing the fibers of the fiber aggregate 50 with the fabric 40 while further conveying the fiber aggregate 50 and the fabric 40 conveyed in the first conveying step by the rotation of the first rotating body 150 . The step of intertwining the fibers of the fiber aggregate 50 and the fabric 40 is also referred to as an "entanglement step". The woven fabric 40 and the fiber assembly 50 in an intertwined state are referred to as a sheet 60 . The sheet 60 shows a state from a state in which at least a part of the fiber aggregate 50 is intertwined with the fabric 40 to a state in which a cutting process is performed in a cutting step described later. In FIG. 6 , the sheet 60 and the sheet member 70 are indicated by hatched portions facing downward to the right.

In the second conveying step, the fabric 40 is conveyed in a state of being in contact with the outer peripheral surface 150a of the first rotating body 150, and it is desirable to convey the fiber aggregate 50 on the outermost side with respect to the conveying surface. Since the fibers of the fiber aggregate 50 are light and have a high degree of freedom, as shown in FIG. 6 , if there is a gradient in the conveyance path from the first conveying step to the second conveying step, the conveyance of the fiber aggregate 50 may stagnate or the fiber density may change during the conveyance of the fabric 40 and the fiber aggregate 50 from the upstream conveying device 130 to the first rotating body 150 .

In this regard, the fabric 40 is conveyed in a state of contacting the outer peripheral surface 150a. If the fiber aggregate 50 is conveyed on the outermost side with respect to the conveying surface, the fiber aggregate 50 is conveyed in a manner of lifting from the bottom to the top along the arc of the first rotating body 150. The next is transported. Furthermore, the fibers of the fiber aggregate 50 are easily conveyed while being spread out along the conveying direction. As a result, by using the first injection device 300 to spray high-pressure water f on the fiber aggregate 50 whose fibers are more spread than the fabric 40, the fibers of the fiber aggregate 50 are easily formed relative to the fabric 40, and the fibers of the fiber aggregate 50 are uniformly entangled, and the unevenness of the fibers of the fiber aggregate 50 that occurs in the manufactured sheet member 70 can be reduced.

In the transfer from the first transfer step to the second transfer step, the peripheral speed of the first rotating body 150 is preferably higher than the moving speed of the upstream conveyor belt 130a, and the peripheral speed of the first rotating body 150 is more preferably faster than the moving speed of the upstream conveyor belt 130a. If the peripheral speed of the first rotating body 150 is slower than the moving speed of the upstream conveying belt 130a, the fabric 40 may become loose in the upstream conveying device 130, or the conveyance of the fiber aggregate 50 placed on the fabric 40 may also stagnate, resulting in variations in fiber density. In order to prevent this, the peripheral speed of the first rotating body 150 is set above the moving speed of the upstream conveyor belt 130a, and the fabric 40 is conveyed with an appropriate tension, and the fiber aggregate 50 can be easily conveyed in the conveying direction. In addition, the fiber aggregate 50 can be easily conveyed, and the concern about unevenness of the fiber density can be easily alleviated.

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 continuously drives and rotates in the circumferential direction Dc2 (for example, counterclockwise) with the horizontal axis C150 as the rotation center. In addition, the circumferential direction Dc2 is also the conveyance direction, and the CD direction is perpendicular to the circumferential direction Dc2. The first rotating body 150 has a substantially cylindrical shape, and a plurality of suction holes 151 are provided on its peripheral surface. The inner peripheral side and the outer peripheral side of the first rotating body 150 communicate through the suction holes 151 so that liquid and gas can pass through.

The first rotating body 150 includes a suction mechanism. A cylindrical partition wall 152 is provided on the inner peripheral side of the first rotating body 150 concentrically with the first rotating body 150 . On the inner peripheral side of the first rotating body 150 , the annular substantially closed space SP is divided into a first area SP1 , a second area SP2 , and a third area SP3 sequentially in the circumferential direction Dc1 by a plurality of partition walls 153 , 153 , 153 . The first area SP1 and the second area SP2 on the upstream side are maintained at a negative pressure state lower than the outside air pressure, and the third area SP3 is at the same pressure as the outside air pressure or at a pressure value between the first area SP1 and the second area SP2 and the outside air pressure. The first region SP1 and the second region SP2 are brought into a negative pressure state, and the sprayed water f is sucked toward the inner peripheral side while sucking and holding the fabric 40 and the fiber assembly 50 . In addition, the rotation of the 1st rotating body 150 means the state which rotates the outer peripheral surface 150a, and the cylindrical partition wall 152 and the partition walls 153, 153, 153 are each fixed.

The first injection device 300 is provided on the outer side in the radial direction of the first rotating body 150 . The 1st spray apparatus 300 is equipped with spray nozzles 301 and 302 sequentially from the upstream side of a conveyance direction. The first spraying device 300 sprays water f from the radially outer side to the inner side of the first rotating body 150 to the fabric 40 and the fiber assembly 50 held on the outer peripheral surface 150 a of the first rotating body 150 .

The injection nozzles 301 and 302 are respectively arranged at different positions in the conveyance direction. Since the injection nozzles 301 and 302 have almost the same basic structure, 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 an injection hole of the injection nozzle 302 . In addition, FIG. 9A shows that the first rotating body 150 , the spray nozzle 302 , the spray nozzle 301 and the like other than the fabric 40 and the fiber assembly 50 are omitted.

The spray nozzle 302 is vertically arranged with respect to the outer peripheral surface 150 a of the first rotating body 150 , and sprays water f at 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 injection holes 301b arranged at regular intervals in a straight line parallel to the CD direction. The water f sent from the side opposite to the first rotating body side of the spray nozzle 302 is sprayed from the plurality of spray holes 301b to the entire CD direction of the fabric 40 and the fiber assembly 50 . The diameter of the injection holes 301b is set to, for example, 50-200 μm, and the distance between the centers of the injection holes 301b adjacent to the CD direction is set, for example, to 0.2-2.0 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 it is more desirable that the injection pressure of the water flow on the upstream side is lower than the injection pressure of the water flow on the downstream side. Specifically, the injection pressure of the water flow from the injection nozzle 301 is lower than the injection pressure of the water flow from the injection nozzle 302 . In addition, it is desirable to set the injection pressure of each water flow within the range of 1.0 to 7.0 MPa.

When the fibers of the fiber assembly 50 are not entangled with the fabric 40 , the outer surface of the fiber assembly 50 (the surface opposite to the side facing the fabric 40 ) is not constrained and has a high degree of freedom. Therefore, if the injection pressure of the water flow on the upstream side is increased, the fiber assembly 50 may be damaged or the fiber density of the fiber assembly 50 may be uneven because the injected water flow blows off the fibers. In this regard, setting the injection pressure of the water stream on the upstream side to be lower lowers the concern of blowing off the fibers, and makes it easier and more sure to entangle the fibers with the fabric 40 . On the other hand, on the downstream side, since at least a part of the fiber is entangled with the fabric 40 , it is necessary to further entangle the fiber assembly 50 with the fabric 40 . Therefore, more fibers of the fiber assembly 50 and the fabric 40 are easily entangled in addition to applying a higher spray pressure of the water flow on the upstream side.

Next, the sheet 60 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 rotating body 160 continuously drives and rotates the outer peripheral surface 160 a in the circumferential direction Dc1 (for example, clockwise) with the horizontal axis C160 as the rotation center. The circumferential direction Dc1 is also the conveyance direction, and the CD direction is perpendicular to the circumferential direction Dc1. The second rotating body 160 has the same structure as that of the first rotating body 150, and detailed description thereof will be omitted.

In addition, the peripheral velocity of the second rotating body 160 is preferably higher than the peripheral velocity of the first rotating body 150 , and the peripheral velocity of the second rotating body 160 is more preferably faster than that of the first rotating body 150 . Similar to the relationship between the speeds of the first rotating body 150 and the upstream conveyor belt 130a, setting the peripheral speed of the second rotating body 160 to be higher than that of the first rotating body 150 can reduce concerns that the fabric 40 will loosen on the first rotating body 150 or that the conveyance of the fiber aggregate 50 will stagnate.

A second injection device 400 is provided on the radially outer side of the second rotating body 160 . The second spraying device 400 includes spraying nozzles 401 and 402 sequentially from the upstream side in the conveying direction, and sprays water f from the outside to the inside in the radial direction of the second rotating body 160 to the sheet 60 held on the outer peripheral surface 160 a of the second rotating body 160 . The injection nozzles 401 and 402 of the second injection device 400 have the same structure as the injection nozzle 302 . By spraying the water f by the second spraying device 400, the sheet 60 can be brought into a state where the fibers of the fiber assembly 50 are more entangled. At this time, as with the first spraying device 300 , it is preferable that the injection pressure of the water flow of water f sprayed by the spray nozzle 401 on the upstream side is lower than that of the water flow sprayed by the spray nozzle 402 on the downstream side. In addition, the second spraying device 400 does not necessarily have to be installed, and may be appropriately installed according to the entanglement state of the sheet 60 . In addition, the second rotating body 160 may also be subjected to dehydration and drying processes for sucking moisture of the sheet 60 .

＜＜Dehydration step＞＞ After being conveyed by the rotation of the second rotating body 160 , the sheet 60 is conveyed from the second rotating body 160 toward the downstream conveying device 140 and then conveyed to the dehydrating device 250 . The downstream conveying device 140 includes a downstream conveying belt 140 a, receives the sheet 60 conveyed by the rotation of the second rotating body 160 , and conveys it toward the dehydrating device 250 .

The dehydration device 250 includes a conveyor belt 250a and a plurality of suction units 250b, and the sheet 60 conveyed from the downstream conveyor device 140 is conveyed toward the cutting device 500 by the conveyor belt 250a. When passing through the plurality of suction units 250b being conveyed by the conveying belt 250a, the moisture of the sheet 60 on the conveying belt 250a is sucked from the lower side.

＜＜Cutting Step＞＞ Cutting processing is performed after the dehydration processing of the sheet 60 . Flakes 60 are delivered from the dehydration device 250 towards the cutting device 500 . The cutting device 500 includes a cutting roll 501 and an anvil roll 502 . The cutter roll 501 and the anvil roll 502 are rotating bodies each equipped with a drive source such as a motor, and are driven to rotate in the circumferential direction Dc2 and the circumferential direction Dc1 around the rotating shafts C501 and 502, respectively. In addition, a plurality of protrusions (not shown) are provided on the outer peripheral surface of the cutter roller 501 . The cutter roll 501 and the anvil roll 502 are arranged so that the axial directions of the rotation axis C501 and the rotation axis C502 are oriented in the CD direction, and their outer peripheral surfaces face each other. Then, when the sheet 60 passes through the roller gap between the rotating cutter roll 501 and the anvil roll 502 , the sheet 60 is cut at the cutting line S at both ends in the CD direction to produce the sheet member 70 .

FIG. 10 is a diagram schematically showing a CD-direction cross-section of the sheet 60 with respect to A in FIG. 6 . The length in the CD direction of the fabric 40 in the state before cutting in the cutting step is longer than the length in the CD direction of the fiber aggregate 50 . Therefore, as shown in FIG. 10 , in the entangled sheet 60 , both end portions of the fiber aggregate 50 in the CD direction have regions that do not overlap with the fabric 40 in the CD direction. Since the outer shape of the fiber aggregate 50 is not predetermined, fiber densities tend to be different at both ends in the CD direction in the state of the sheet 60 . Therefore, in the manufacture of the sheet member 70 , it is only necessary to cut off predetermined regions at both end portions of the fiber aggregate 50 . On the other hand, since the outer shape of the fabric 40 has a predetermined shape, it is not necessarily necessary to cut off the fiber assembly 50 . Therefore, in order to reduce the worry of excessive cutting of the fabric 40, the length W40 of the CD direction of the fabric 40 is set to be equal to or less than the length W50 of the CD direction of the fiber assembly 50 (W40≦W50). Fabric 40 concerns are alleviated. Since the waste of cut fabric 40 can be reduced, the yield of 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 manufacturing method of the sheet member 70 according to the second embodiment. The basic structure of the manufacturing apparatus 101 is the same as that of the manufacturing apparatus 100 . In the manufacturing apparatus 101 , the fabric 40 is not conveyed by the conveying device 130 on the upstream side, but the 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 150 a of the first rotating body 150 . In the following description, the same members as those of the manufacturing apparatus 100 of the first embodiment are denoted by the same reference numerals, and descriptions of parts common to the first embodiment are omitted.

＜＜1st conveying step＞＞ In the first conveying step, the upstream conveying device 130 conveys the fiber aggregate 50 toward the first rotating body 150 , and the supply rotating body 180 supplies the fabric 40 to the first rotating body 150 by the rotation thereof. In addition, the supply rotating body 180 is what is called a raw material roll which winds the continuous fabric 40 in the form of a roll. The fabric 40 is conveyed using the supply rotating body 180, and the upstream conveying belt 130a can convey only the fiber aggregate 50, and the conveying state in which the fiber density is stabilized can be further extended. Therefore, it is easy to keep the fiber density uniform. The CD length (W40) of the fabric 40 conveyed from the supply rotating body 180 is shorter than the CD length (W50) of the fiber aggregate 50 conveyed by the upstream conveying device 130 (W40<W50).

In addition to the desire to feed the fabric 40 to the first rotating body 150 at a constant speed, if the supply rotating body 180 uses a raw material roller, even if the peripheral speed of the supply rotating body 180 is controlled to be the same as the peripheral speed of the first rotating body 150, in fact, the two will not necessarily be the same. When these two speeds cannot be the same, tension unevenness will occur. Therefore, as shown in FIG. 11 , it is desirable to provide a tension control device 800 for the web 40 between the supply rotating body 180 and the first rotating body 150 .

The tension control device 800 adjusts the magnitude of the tension of the fabric 40 when it is supplied to the first rotating body 150 to a predetermined value. The tension control device 800 includes a pair of fixed rollers 801 and a dancer roller 802 provided between the pair of fixed rollers 801 . The dancing roller 802 is set to reciprocate in the vertical direction, and the dancing roller 802 moves in the vertical direction by its own weight to keep the tension of the continuous release fabric 40 constant. The vertical movement of the dancer roller 802 absorbs the difference between the peripheral velocity of the supply rotor 180 and the peripheral velocity of the first rotor 150 , so that the tension of the fabric 40 supplied to the first rotor 150 is easily kept constant. Equipped with the tension control device 800 in this way prevents the fabric 40 from hanging down. Since the fabric 40 and the fiber assembly 50 can be superimposed with the tension maintained at a constant state, the fiber density of the fiber assembly 50 can be easily made uniform, and unevenness caused by the fiber density of the fiber assembly 50 of the manufactured sheet member 70 can be reduced.

In addition, it is desirable that the peripheral speed of the supply rotating body 180 is equal to the peripheral speed of the first rotating body 150 . The worry that the fabric 40 will loosen during conveyance can be alleviated. In addition, it is desirable that the peripheral speed of the first rotating body 150 is equal to or higher than the moving speed of the upstream conveyor belt 130a. The fiber aggregate 50 is conveyed by the first rotating body 150 at a speed higher than that of the upstream conveyor belt 130a, and the fibers of the fiber aggregate 50 are easily conveyed on the outer peripheral surface 150a of the first rotating body 150 while spreading in the conveying direction. Therefore, it is easy to alleviate the variation in the fiber density of the fiber aggregate 50 that occurs when the fiber aggregate 50 is delivered from the upstream conveyor belt 130 a 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 manufacturing method of the sheet member 70 according to the third embodiment. The manufacturing device 102 is a device that manufactures the sheet member 70 that is integrated by entangling the fiber aggregate 50 and the continuous fabric 40 in the same manner as the manufacturing devices 100 and 101 . The manufacturing apparatus 102 includes an upstream conveying device 130 and a water supply device 200, a first rotating body 150 and a first spraying device 300, a second rotating body 160 and a second spraying device, a downstream conveying device 140, a dehydrating device 250, and a cutting device 500 from the upstream side in the conveying direction. In the following description, the same members as those of the manufacturing apparatus 100 of the first embodiment are denoted by the same reference numerals, and descriptions of parts common to the first embodiment are omitted.

In the manufacturing apparatus 102, it is desirable to provide the conveyance surface of the upstream conveyor belt 130a at a position higher than the axis C150. In this way, the height difference when the fabric 40 and the fiber aggregate 50 are conveyed from the upstream conveyor belt 130a to the first rotating body 150 is further reduced, so the gradient generated in the conveying path can be further reduced, so it is easy to reduce the variation in the fiber density of the fiber aggregate 50.

＜＜1st conveying step＞＞ In the first conveying step, the upstream conveying device 130 is used to convey the fabric 40 and the fiber aggregate 50 on and from the fabric 40 . The upstream conveyance device 130 is equipped with the upstream conveyance belt 130a and the roller 130b. At this time, when the upstream conveyor belt 130a is viewed in a plan view, the fabric 40 is conveyed in a state where the fabric 40 is covered with the fiber aggregate 50 in substantially the entire area.

The water supply device 200 is a device that sprays water f as a fluid, and is installed above the upstream conveyor belt 130a. FIG. 13 is a diagram schematically showing the water supply device 200 . In FIG. 13 , the upstream conveying device 130 and the like are omitted. The water supply device 200 supplies water f toward the upstream conveyor belt 130 a to wet the fiber aggregate 50 conveyed on the upstream conveyor belt 130 a to reduce the thickness of the fiber aggregate 50 . The fibers of the fiber assembly 50 are light and soft materials, and simply put, they are in a fluffy state. Therefore, they may move during the conveyance until intertwined with the fabric 40 or may be blown away by the pressure of the water f sprayed by the first spraying device 300 in a subsequent step, and there may be concerns that the number of fibers may increase or decrease. Here, it is preferable to spray water f on the fiber aggregate 50 in the first conveying step to wet the fibers and reduce the thickness of the fiber aggregate 50 so that the fibers are not easily moved. That is, since the purpose of the water supply device 200 is only to allow the fiber assembly 50 to contain water, the fiber assembly 50 and the fabric 40 are not intertwined at this point. Thereby, in the conveyance in the first conveyance step, it is possible to reduce the possibility of unevenness of the fibers in the fiber aggregate 50 of the manufactured sheet member 70 caused by the variation in fiber density. In addition, as a method of wetting the fiber aggregate 50 with water, dripping water, spraying sprayed water, or immersing the fiber aggregate 50 in a container filled with water may be used.

And it is conveyed toward the 1st rotating body 150 by passing below the roller 130b. When the fabric 40 and the fiber aggregate 50 are delivered from the upstream conveying device 130 to the first rotating body 150, the fiber aggregate 50 is passed through the gap between the roller 130b facing each other and the upstream conveying belt 130a. The fiber aggregate 50 is sandwiched between the rollers 130b and the upstream conveyor belt 130a, and the fiber aggregate 50 is crushed in the thickness direction to reduce the thickness of the fiber aggregate 50 and stabilize the movement of the fibers. Thereby, the fiber moves in the first conveying step, and the possibility of unevenness of the fiber density can be alleviated, and the concern of the unevenness of the fibers in the fiber assembly 50 of the manufactured sheet member 70 can be alleviated.

＜＜Second transport step＞＞ In the second conveying step, the fabric 40 is conveyed in a state of being in contact with the outer peripheral surface 150a of the first rotating body 150, and it is desirable to convey the fiber aggregate 50 on the outermost side with respect to the conveying surface. The fibers of the fiber aggregate 50 are light and have a high degree of freedom. Therefore, as shown in FIG. 12 , when there is a gradient in the conveyance path from the first conveying step to the second conveying step, the conveyance of the fiber aggregate 50 may easily stagnate and the fiber density may change in the vicinity of the roller 130b that conveys the fabric 40 and the fiber aggregate 50 from the upstream conveying device 130 to the first rotating body 150. When the fabric 40 is conveyed in a state of being in contact with the outer peripheral surface 150a, if the fiber aggregate 50 is conveyed on the outermost side with respect to the conveyance surface, the outer surface of the fiber aggregate 50 (the surface opposite to the side opposite to the fabric 40) is not constrained, but is conveyed in a state with a high degree of freedom. Therefore, when conveying using the first rotating body 150 , it is easy to convey the fibers of the fiber aggregate 50 while spreading them along the conveying direction. As a result, by using the first injection device 300 to spray high-pressure water f on the fiber aggregate 50 whose fibers are more spread than the fabric 40, the fibers of the fiber aggregate 50 are easily formed relative to the fabric 40, and the fibers of the fiber aggregate 50 are uniformly entangled, and the unevenness of the fibers of the fiber aggregate 50 that occurs in the manufactured sheet member 70 can be reduced.

Next, 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 spraying device 400 sprays the water f from the radially outer side to the inner side of the second rotating body 160 toward the sheet 60 . The second injection device 400 includes one injection nozzle. The spraying of water f by the second spraying device 400 can make the sheet 60 into a state where more fibers of the fiber assembly 50 are entangled with the fabric 40 . In addition, it is more desirable to set the injection pressure of the sprayed water stream to be the smallest at the injection nozzle 301 and to increase in the order of the injection nozzle 302 and the injection nozzle 303 . On the upstream side, it is possible to create a state in which more fibers are entangled with the fabric 40 on the downstream side, while reducing the concern that the fibers of the fiber assembly 50 will be blown away by the water flow.

＜＜Dehydration step＞＞ After being conveyed by the rotation of the second rotating body 160, the sheet 60 is conveyed from the second rotating body 160 to the downstream conveying device 140 similarly to the first embodiment, and then conveyed to the dehydrating device 250 for dehydration treatment.

＜＜Cutting Step＞＞ Cutting processing is performed after the dehydration processing of the sheet 60 . Similar to the first embodiment, the sheet 60 delivered from the dehydrating device 250 is cut by the cutting device 500 at both ends in the CD direction at the cutting line S to form a sheet member 70 (see FIG. 10 ). At this time, the length W40 in the CD direction of the fabric 40 is made shorter than the length W50 in the CD direction of the fiber assembly 50 (W40<W50), and the worry of excessive cutting of the fabric 40 can be alleviated except for both ends of the CD direction of the fiber assembly 50 whose fiber density is unstable.

===Other Embodiments=== Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention for explainers. In addition, the present invention can be changed and improved without departing from the gist thereof, and it goes without saying that the present invention also includes equivalents thereof. For example, such variations as shown below are possible.

In the above-mentioned embodiment, although the rotating body (first rotating body 150, second rotating body 160) is used for conveying and interlacing the fiber aggregate 50 and the fabric 40, it is not limited to this. For example, the fiber assembly 50 and the fabric 40 may be entangled while being conveyed using a horizontal conveyor belt and jetting the fluid toward the conveyor belt.

In addition, in the above-mentioned embodiment, although the fabric 40 and the fiber aggregate 50 were conveyed using the 1st rotating body 150 and the 2nd rotating body 160 in the 2nd conveying step, it is not limited to this. For example, after the interlacing process is performed while being conveyed by the first rotating body 150, it may be conveyed toward the downstream conveying device 140 immediately, or all processes (from the first conveying step to the cutting step) may be performed on a conveying device having a conveying belt. In addition, when the second rotating body 160 is not provided, it is desirable that the conveying speed of the downstream side conveying device 140 is equal to or higher than the peripheral speed of the first rotating body 150 . Thereby, concerns that the fabric 40 conveyed on the first rotating body 150 will loosen or that the conveyance of the fiber aggregate 50 will be stagnated can be alleviated. In addition, when the second rotating body 160 is installed, regardless of whether it is installed or not, the downstream conveying device 140 is provided with a suction mechanism, and the downstream conveying device 140 can be used to convey the sheet 60 (the fabric 40 and the fiber aggregate 50) while interlacing the fabric 40 and the fiber aggregate 50.

In addition, in the above-mentioned embodiment, the fabric 40 is placed on the fiber aggregate 50 in the arrangement step, but the present invention is not limited to this. In the arranging step, the fiber aggregate 50 may be placed on the fabric 40 and conveyed to the entanglement step.

In the above-mentioned embodiment, although the thickness of the fiber aggregate 50 is reduced by using the water supply device 200, the roller 130b, etc., the structure of the water supply device 200 may not necessarily be provided, and the structure in which the roller 130b and the upstream conveyor belt 130a are opposed to each other with the fiber aggregate 50 sandwiched therebetween may not be required. Moreover, the structure of any one of the water supply device 200 and the roller 130b may be provided. As long as any one is provided, the thickness of the fiber aggregate 50 can be made thinner.

In the above-mentioned embodiment, although a plurality of spray nozzles are provided in the first spray device 300, it is not limited thereto. For example, one spray nozzle may be provided in the first spray device 300 , or a plurality of spray devices that spray water toward the first rotating body 150 may be provided. In addition, the number of spray nozzles included in the first spray device 300 can also be changed arbitrarily. The same applies to the second injection device 400 .

In addition, in the above-mentioned embodiment, although water f is used as the fluid sprayed from the first spraying device 300 and the second spraying device 400, it is not limited thereto. For example, a gas may be used, and a liquid having a predetermined composition and viscosity may be used instead of water.

1: Physiological sanitary napkins (sanitary napkins, absorbent articles) 2: Absorber 3: Surface sheet (sheet member)

4: back sheet

5: side sheet

6: wing

8: Peripheral sealing part

10: Absorbent core

11: Adhesive area

12: Adhesive area for wings

20: core cladding sheet

40: Fabric

41: Composition Yarn

42: warp

43: weft yarn

45: weave

50: fiber aggregate

51: Forming fibers

60: flakes

70: sheet components

100: Manufacturing device

101: Manufacturing device

102: Manufacturing device

120: Roller for direction change

130: Upstream conveying device

130a: Upstream side conveyor belt (conveyor conveyor belt, another conveyor mechanism)

130b: Roller

140: Downstream conveying device

140a: Downstream conveyor belt

150: The first rotating body (rotating body, one of the conveying mechanisms)

150a: outer peripheral surface

151: suction hole

152: Cylindrical partition

153: next door

160: The second rotating body

160a: outer peripheral surface

180: supply rotating body

200: water supply device

250: dehydration device

250a: conveyor belt

250b: Department of Attraction

300: 1st injection device

301: spray nozzle

302: spray nozzle

303: spray nozzle

400: The second injection device

401: spray nozzle

402: spray nozzle

500: cutting device

501: cutting roller

502: Anvil roller

800: Tension control device

801: fixed roller

802: Dancing roller

f: water

S: cutting line

SP: Roughly enclosed space

Dc1: Circumferential

Dc2: Circumferential

C160: Horizontal axis

C150: Horizontal axis

C502: Rotary axis

C501: Rotary axis

[FIG. 1] It is a top view which looked at the sanitary napkin 1 from the skin side. [ Fig. 2 ] is a plan view of the sanitary napkin 1 viewed from the non-skin side. [ Fig. 3 ] is a sectional view taken along line X-X in Fig. 1 . [ FIG. 4 ] is an enlarged view of a part of the surface sheet 3 . [ FIG. 5 ] A diagram showing a state where the surface sheet 3 is separated into a fabric 40 and a fiber assembly 50 . [ Fig. 6 ] is a diagram schematically showing a part of the manufacturing apparatus 100 used in the manufacturing method of the sheet member 70 according to the first embodiment. [ Fig. 7 ] is a diagram schematically showing the 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. 9 ], FIG. 9A is a diagram schematically showing the injection nozzle 302 . FIG. 9B is a diagram schematically showing a configuration example of an injection hole of the injection nozzle 302 . [ Fig. 10 ] is a diagram schematically showing a cross section in the CD direction of the sheet 60 in relation to A in Fig. 6 . [ Fig. 11 ] is a diagram schematically showing a part of the manufacturing apparatus 101 used in the manufacturing method of the sheet member 70 according to the second embodiment. [ Fig. 12 ] is a diagram schematically showing a part of the manufacturing apparatus 102 used in the manufacturing method of the sheet member 70 according to the third embodiment. [ FIG. 13 ] is a diagram schematically showing a water supply device 200 .

40: fabric

50: fiber aggregate

60: flakes

70: sheet member

100: Manufacturing device

130: Upstream conveying device

130a: Upstream conveyor belt (conveyor belt, other conveyor mechanisms)

150: the first rotating body (rotating body, a certain conveying mechanism)

150a: outer peripheral surface

160: The second rotating body

160a: outer peripheral surface

250: dehydration device

250a: conveyor belt

250b: Department of Attraction

300: 1st injection device

301: spray nozzle

302: spray nozzle

400: The second injection device

401: spray nozzle

402: spray nozzle

500: cutting device

501: cutting roller

502: Anvil roller

C150: Horizontal axis

C160: Horizontal axis

C501: Rotary axis

C502: Rotary axis

Dc1: Circumferential

Dc2: Circumferential

Claims (15)

A method for manufacturing a sheet member, which is a method for manufacturing a sheet member for an absorbent article having a fabric and a fiber assembly intertwined with the fabric, comprising: arranging the fiber assembly on at least one surface side of the web continuous in the conveying direction; after the arranging step, spraying a fluid toward the fabric and the fiber aggregate to entangle the fiber aggregate and the fabric; and after the entangling step, cutting the fiber aggregate in a CD direction intersecting the conveying direction In the step of cutting both ends, 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. The method for manufacturing a sheet member according to claim 1, wherein, in the interlacing step, one of the conveying mechanisms is used to convey the fiber aggregate at a certain conveying speed, and the other conveying mechanism is used to convey the fiber aggregate toward the one of the conveying mechanisms at another conveying speed, and the certain conveying speed is greater than or equal to the other conveying speed. The method for manufacturing a sheet member according to claim 1 or 2, wherein, in the entanglement step, the fabric and the fibers are oriented at different positions in the conveying direction. The dimensional aggregate injects fluid a plurality of times, and the pressure of the fluid injected on the upstream side of the conveying direction is equal to or lower than the pressure of the fluid injected on the downstream side of the conveying direction. The method for manufacturing a sheet member according to claim 1, wherein, in the entanglement step, the fluid is sprayed from the radially outer side toward the inner side of the rotating body in a state where at least one of the fabric or the fiber aggregate is brought into contact with the peripheral surface of the rotating body having a suction mechanism. The method for manufacturing a sheet member according to claim 4, wherein in the arranging step, at least the fiber aggregate is conveyed using a conveyor belt, and in the interlacing step, the fabric and the fiber aggregate are further conveyed using the rotating body, the conveying surface of the conveyor belt is set at the same height as the center of rotation of the rotating body, or at a position higher than the center of rotation, and the fiber aggregate is conveyed upward along the rotation direction of the rotating body after the conveyance by the rotating body is started. The manufacturing method of a sheet member according to claim 4, wherein in the arranging step, at least the fiber aggregate is conveyed using a conveyor belt, and in the interlacing step, the rotator is used to further convey the In the fabric and the fiber aggregate, the conveying surface of the conveying belt is located below the center of rotation of the rotating body, and between the conveying by the conveying belt and the conveying by the rotating body, there is a step of passing the fiber aggregate through the closest position between the rotating body and the conveying belt. The method of manufacturing a sheet member according to claim 6, wherein, in the conveyance by the conveyer, the conveyer does not convey the web, and there is a supply step of supplying the web to the rotating body before conveying by the rotating body. The method of manufacturing a sheet member according to claim 7, wherein in the supplying step, the supply rotating body for supplying the fabric supplies the fabric while maintaining a constant tension of the fabric. The method of manufacturing a sheet member according to claim 8, wherein the peripheral speed of the supply rotating body is equal to that of the rotating body, and the peripheral speed of the rotating body is equal to or higher than the moving speed of the conveying belt. The method for manufacturing a sheet member as described in claim 1, wherein, Before the aforementioned entanglement step, a treatment for reducing the thickness of the aforementioned fiber aggregate is performed. The method of manufacturing a sheet member according to claim 10, wherein the treatment for reducing the thickness of the fiber aggregate is a fluid jetting treatment. The method for manufacturing a sheet member according to claim 10, wherein in the arranging step, at least the fiber aggregate is transported using a conveyor belt, and in the interlacing step, the fabric and the fiber aggregate are further conveyed using a rotating body to reduce the thickness of the fiber aggregate, and the fiber aggregate is passed between the opposing conveyor belt and the rotating body. The method for manufacturing a sheet member according to claim 1, wherein, in the entanglement step, the fabric and the fiber assembly are conveyed by one rotating body, and after the conveyance by the rotating body, the fabric and the fiber assembly are conveyed by a downstream conveying mechanism at a downstream conveying speed, and the downstream conveying speed is equal to or higher than the peripheral speed of the rotating body. The method of manufacturing a sheet member according to claim 13, wherein the downstream conveying mechanism includes a suction mechanism, The fabric and the fiber aggregate are conveyed at the downstream conveying speed by the downstream conveying mechanism, and the fluid is sprayed toward the fabric and the fiber aggregate to further entangle the fiber aggregate and the fabric. A manufacturing apparatus of a sheet member, which is a sheet member manufacturing apparatus for absorbent articles having a fabric and a fiber aggregate intertwined with the fabric, comprising: an arrangement portion for arranging the fiber aggregate on at least one surface side of the fabric continuous in the conveyance direction; an entanglement portion for jetting a fluid toward the fabric and the fiber aggregate after the arrangement of the fiber aggregate to entangle the fiber aggregate and the fabric; and cutting both ends of the fiber aggregate in a CD direction intersecting the conveyance direction. In the cut portion, 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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