WO2019107333A1

WO2019107333A1 - Sheet-piece producing method, sheet-piece producing apparatus, and absorbent-body producing method

Info

Publication number: WO2019107333A1
Application number: PCT/JP2018/043499
Authority: WO
Inventors: 到高濱; 知之茂木; 優喜加藤
Original assignee: 花王株式会社
Priority date: 2017-11-28
Filing date: 2018-11-27
Publication date: 2019-06-06
Also published as: TW201924887A; JP2019097614A; RU2020120948A; CN111417369A; CN111417369B; RU2020120948A3

Abstract

A sheet-piece producing method according to the present invention includes: a first cutting step in which a raw-material sheet (10bs) is cut in a transport direction (MD) thereof by a first cutting mechanism (5A) to obtain a plurality of strip-shaped narrow sheets (10bt); and a second cutting step in which the narrow sheets (10bt) are cut in a direction (CD) intersecting the transport direction by a second cutting mechanism (5B) to obtain a plurality of sheet pieces (11). The second cutting step is performed by supplying the narrow sheets (10bt) between a cutter roll (53) and an anvil roll (54), which axially rotate, in the second cutting mechanism (5B). The circumferential velocity (V1) of the roll (53) is set to be higher than the velocity (V0) at which the narrow sheets (10bt) are supplied between the rolls (53), (54).

Description

Method of manufacturing sheet piece, apparatus of manufacturing sheet piece, and method of manufacturing absorbent body

The present invention relates to a method of continuously producing a plurality of sheet pieces of the intended size, and a method of producing an absorbent containing the sheet pieces.

DESCRIPTION OF RELATED ART The absorber which contains a pulp fiber and a synthetic fiber as an absorber used for absorbent articles, such as a disposable diaper, a sanitary napkin, an incontinence pad, etc. is known. With regard to such an absorbent body, for example, Patent Document 1 describes an absorbent body comprising hydrophilic fibers and non-woven fabric pieces as an aggregate of synthetic fibers, and, as a method of producing the absorbent body, bonding fibers to each other There is described a manufacturing method comprising the steps of: grinding a non-woven fabric having a three-dimensional structure to obtain non-woven fabric pieces by a cutter mill method; and mixing the non-woven fabric pieces with hydrophilic fibers.

Further, so-called slitting, in which a long sheet having a large width is continuously cut at a constant width, is used not only in this technical field but also in various fields. For example, Patent Document 2 uses a slitter device that performs a corresponding number of slit cuts on an object to be cut with a predetermined number of slitter blades provided on a shaft axis, in the direction perpendicular to the sheet conveying direction. It is described to cut and separate into multiple rows.

JP 2002-301105 A JP 2014-42944 A

The present invention is directed to a first cutting process of obtaining a plurality of strip-like narrow sheets by transporting the strip-like material sheet in one direction and cutting the material sheet along the transport direction by the first cutting mechanism. A second cutting step of obtaining the plurality of sheet pieces by transporting the narrow sheet in one direction, and cutting the narrow sheet in the transport cross direction intersecting with the transport direction by the second cutting mechanism; It is a manufacturing method of a sheet piece which has. The second cutting mechanism is configured to include a cutter roll rotatably supported around an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed to face the cutter roll. The second cutting step is performed by introducing the narrow sheet between the cutter roll rotating about an axis and the anvil roll. It is a manufacturing method of a sheet piece which makes the peripheral speed of the above-mentioned cutter roll quicker than the introduction speed of the above-mentioned narrow sheet between the above-mentioned cutter roll of the above-mentioned cutter roll, and the above-mentioned anvil roll.

Moreover, this invention is a manufacturing method of the absorber containing a several sheet piece. It is a manufacturing method of an absorber which has a process of carrying and accumulating a sheet piece manufactured by a manufacturing method of a sheet piece of the above-mentioned present invention by a flow of air to a predetermined accumulation part.

Further, according to the present invention, a first cutting mechanism for forming a plurality of strip-like narrow sheets by cutting the strip-like raw material sheet in one direction while cutting the raw-material sheet along the transport direction; The narrow sheet formed on the downstream side of the conveying direction with respect to the first cutting mechanism and cut by the first cutting mechanism is cut in the conveying crossing direction intersecting the conveying direction to form a plurality of strip-shaped sheet pieces It is a manufacturing apparatus of a sheet piece provided with the 2nd cutting mechanism to form. The second cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed opposite to the cutter roll, and both rolls rotating about an axis The narrow sheet introduced therebetween is configured to be cut in the conveyance cross direction. It is a manufacturing apparatus of a sheet piece in which the peripheral speed of the said cutter roll is quicker than the introduction speed of the said narrow sheet | seat between this cutter roll and the said anvil roll.

FIG. 1 is a schematic perspective view of an embodiment of an absorbent body produced by the method for producing an absorbent body of the present invention. FIG. 2 is a schematic perspective view of a manufacturing apparatus that can be used to carry out the method of manufacturing an absorbent according to the present invention. FIG. 3 is a schematic configuration view of a second supply mechanism (sheet piece manufacturing apparatus) included in the manufacturing apparatus shown in FIG. FIG. 4 is an explanatory view of a method of cutting a raw material sheet performed by the second supply mechanism shown in FIG. 3. FIG. 5 is an explanatory view of a method of cutting a narrow sheet by a cutter roll in the second cutting mechanism shown in FIG. 3. FIG. 6 is a schematic configuration view of another embodiment of the second supply mechanism (sheet piece manufacturing apparatus) included in the manufacturing apparatus shown in FIG. FIG. 7 is an explanatory view of a narrow sheet cutting method according to another embodiment of the cutter roll in the second cutting mechanism shown in FIG. 3;

Detailed Description of the Invention

As described in Patent Document 1, when a nonwoven fabric is manufactured by crushing a nonwoven fabric using a cutter mill method, it is difficult to form a nonwoven fabric piece of a desired size, and it is possible to use the intended size. Variations occur. As a result, unevenness occurs in the structure of the absorbent body including the non-woven fabric piece formed, which may cause a feeling of foreign matter during use.

As a method capable of continuously producing a plurality of sheet pieces of the intended size, there is mentioned a method (cross cut) of cutting an object to be cut in two cutting directions crossing each other. Specifically, for example, a plurality of strip-like narrow sheets are first subjected to slit cutting as the first cutting using a known slitter as described in Patent Document 2 with respect to the non-woven fabric as the raw material sheet. Then, the plurality of narrow sheets are supplied to a cutter roll provided with a cutter blade extending in the slit direction, that is, in the direction intersecting with the conveyance direction of the raw material sheet, and the second cutting is performed. However, when the present inventors variously examined such non-woven cloth cross-cuts, it is possible that cutting defects may occur particularly in the second cutting step of cutting a strip narrow sheet in the transport direction. It turned out to be.

Therefore, the present invention includes a method for producing a sheet piece, an apparatus for producing the sheet piece, and a production method for the sheet piece, in which cutting defects of the sheet are suppressed and a plurality of sheet pieces of the intended size can be efficiently produced continuously. The present invention relates to providing a method of producing an absorbent.

Hereinafter, the method for producing a sheet piece, the apparatus for producing a sheet piece, and the method for producing an absorber according to the present invention will be described based on those preferred embodiments with reference to the drawings. FIG. 1 shows an absorber 10 which is an embodiment of an absorber produced by the method for producing an absorber of the present invention. The absorbent body 10 includes a plurality of sheet pieces 11 and hydrophilic fibers 12.

Each of the plurality of sheet pieces 11 is a fiber assembly in which a plurality of fibers are integrated. As described later, the sheet piece 11 is manufactured by so-called cross cutting in which a raw material sheet having a predetermined size is cut in two cutting directions crossing each other (see FIG. 4). Due to the method of manufacturing such a sheet piece, the absorbent body 10 has a point that the plurality of sheet pieces 11 contained therein have a certain size. In the present embodiment, each of the plurality of sheet pieces 11 has a rectangular parallelepiped shape, has a rectangular surface in a plan view, and has a longitudinal direction and a lateral direction.

The size of the sheet piece 11 affects the characteristics such as the cushioning property of the absorbent body 10 to some extent. The average length of the sheet piece 11 is preferably 0.3 mm or more and 30 mm or less, more preferably 1 mm or more and 15 mm or less, and particularly preferably 2 mm or more and 10 mm or less. The “average length of the sheet piece” mentioned here means that, in the case where the sheet piece 11 has a rectangular parallelepiped shape, the four long sides (longer than the other sides) extending in the longitudinal direction (long-axis direction) When the sheet piece 11 is cubic, it means the average value of the length of all the sides which define the cube.

The average width of the sheet piece 11 is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 6 mm or less, and particularly preferably 0.5 mm or more and 5 mm or less. The “average width of the sheet piece” as used herein refers to a plurality of short sides (other sides) extending in a direction (short direction) orthogonal to the longitudinal direction (long axis direction) when the sheet piece 11 has a rectangular parallelepiped shape. This means the average value of the lengths of relatively shorter sides), and in the case of the sheet piece 11 having a cubic shape, it is the same as the “average length of the sheet piece” described above. That is, when the sheet piece 11 has a cubic shape, the average length and the average width are the same.

When the average length of the sheet piece 11 is 0.3 mm or more and / or the average width is 0.1 mm or more, a loose structure is easily formed in the absorbent body 10, and the cushioning property is excellent. In addition, when the absorbent body 10 is used by incorporating it into an absorbent article such as a disposable diaper when the average length of the sheet piece 11 is 30 mm or less and / or the average width is 10 mm or less, the wearer of the absorbent article It is hard to give a sense of incongruity due to the absorber 10, and furthermore, it is difficult to make the absorption performance uneven depending on the position in the absorber 10.

A non-water absorbing synthetic resin (thermoplastic resin) can be illustrated as a raw material of the constituent fiber of the sheet piece 11, For example, polyethylene, a polypropylene, a polyethylene terephthalate etc. are mentioned. The constituent fibers of the sheet piece 11 are typically short fibers consisting of one or more of these synthetic resins.

In addition, as the hydrophilic fibers 12 used in combination with the sheet piece 11 in the absorbent body 10, various types of fibers conventionally used in absorbent bodies for absorbent articles can be used without particular limitation. For example, pulp fibers, Rayon fibers, cotton fibers and the like can be mentioned.

The absorbent body 10 may further contain a water absorbing polymer, and as the water absorbing polymer, various materials conventionally used for an absorbent for absorbent articles can be used without particular limitation. Moreover, in this embodiment, as shown in FIG. 1, although the some sheet piece 11 is uniformly disperse | distributed to the whole of the absorber 10, you may be unevenly distributed. As a form by which the sheet piece 11 is unevenly distributed, the absorber which has a laminated structure of the layer which the sheet piece 11 makes a main body, and the layer which the hydrophilic fiber 12 makes a main body can be illustrated.

The absorbent body 10 is suitably used as a component of an absorbent article. The absorbent articles mentioned here widely include articles used for absorbing body fluid (urine, soft stools, menstrual blood, sweat, etc.) discharged from the human body, and so-called unfolded disposable diapers having a fastening tape, pants type Disposable diapers, sanitary napkins, sanitary shorts, incontinence pads and the like. The absorbent in the absorbent article typically comprises a liquid absorbent absorbent core and a liquid permeable core wrap sheet that covers the outer surface of the absorbent core, and the absorbent 10 is this absorbent. It can be used as a core. As the core wrap sheet, paper, non-woven fabric or the like can be used. In addition, the absorber 10 does not need to contain a core wrap sheet, and in that case, an absorbent core is used for an absorbent article as the absorber 10 as it is.

An absorbent article having an absorbent body 10 typically has a liquid-permeable top sheet which can come into contact with the wearer's skin when worn, a liquid-impermeable to water-repellent back sheet, and a gap between these both sheets. And a liquid-retaining absorber disposed in between. As the surface sheet, various non-woven fabrics or porous synthetic resin sheets can be used, and as the back surface sheet, a synthetic resin film made of polyethylene, polypropylene, polyvinyl chloride or the like, or a composite of a synthetic resin film and non-woven fabric Materials and the like can be used. The absorbent article may further include various members according to the specific use of the absorbent article. Such components are known to those skilled in the art. For example, when the absorbent article is applied to a disposable diaper or a sanitary napkin, one or two or more pairs of three-dimensional guards can be disposed on the left and right sides of the top sheet.

FIGS. 2 and 3 show a manufacturing apparatus (stacking apparatus) 1 that can be used to carry out the above-described method of manufacturing the absorbent body 10. The method of manufacturing the absorbent body 10 includes the step of manufacturing the sheet piece 11 and the accumulation step of conveying and accumulating the plurality of sheet pieces 11 manufactured in the manufacturing step to a predetermined accumulation portion by an air flow.

The manufacturing apparatus 1 includes a rotating drum 2 in which an accumulation recess 22 as an accumulation portion is formed on an outer peripheral surface 2 f, and a duct 3 having a flow passage 30 for conveying the raw material of the absorber 10 on the outer peripheral surface 2 f. The raw material carried on the air flow (vacuum air) generated in the flow path 30 by suction from the inside of the rotary drum 2 while rotating the rotary drum 2 around the rotary shaft along the drum circumferential direction 2Y Is made to be accumulated in the accumulation recess 22. A first supply mechanism 4 and a second supply mechanism 5 are respectively connected to the duct 3 as a supply mechanism of the raw material (fiber material) of the absorber 10. Further, below the rotary drum 2, there is disposed a vacuum conveyor 6 which receives the accumulated material of the raw material released from the accumulation recess 22, ie, the absorbent body 10 and conveys it to the next process. Further, on the opposite side of the rotary drum 2 from the duct 3, a pressing belt 7 for pressing the accumulated material in the accumulation recess 22 is disposed along the outer peripheral surface 2 f of the rotary drum 2. The presser belt 7 is an endless, breathable or non-breathable belt, and is stretched over the

rolls

71 and 72 so as to move along with the rotation of the rotary drum 2.

The rotary drum 2 includes a cylindrical drum main body 20 made of a rigid metal body and an outer peripheral member 21 disposed on the outer peripheral portion of the drum main body 20 so as to form an outer peripheral surface 2 f of the rotary drum 2. ing. The outer peripheral member 21 receives power from a prime mover such as a motor and rotates in the direction R1 along the drum circumferential direction 2Y about the horizontal rotation axis as a rotation center, but the drum main body disposed inside the outer peripheral member 21 20 is fixed and does not rotate. Both ends in the drum width direction Y of the drum main body 20 are airtightly sealed by a side wall not shown and a sealing material such as felt.

The outer peripheral member 21 is a bottom of the accumulation recess 22, that is, the air permeable porous plate 23 which forms the pile surface of the raw material, and the air permeability which forms a portion other than the pile surface in the outer peripheral surface 2 f of the rotary drum 2. Alternatively, it is configured to include a non-air-permeable pattern forming plate 24. In the manufacturing apparatus 1, the pattern forming plate 24 has an annular shape extending continuously along the entire length in the drum circumferential direction 2Y, and a pair of pattern forming plates 24 is provided at both ends in the rotational axis direction of the rotary drum 2. Between the

plates

24, 24, the porous plate 23 is located.

The porous plate 23 transmits an air flow generated by suction from the inside of the apparatus (inward of the rotating drum 2) to the outside of the apparatus (outward of the rotating drum 2), and is carried on the air flow It is a breathable plate that holds raw materials without permeation and allows only air to permeate. In the porous plate 23, a large number of suction holes penetrating the porous plate 23 in the thickness direction are formed in the entire porous plate 23, and the accumulation recess 22 is located on the space maintained at a negative pressure in the rotary drum 2. During passage, the suction holes function as air flow passage holes. As the porous plate 23, for example, a mesh plate made of metal or resin, or a plate made of metal or resin, in which a large number of pores are formed by etching, punching or the like can be used. Further, as the pattern forming plate 24, for example, a plate made of metal such as stainless steel or aluminum or resin can be used.

As shown in FIG. 2, the inside of the drum main body 20 is divided into a plurality of spaces A, B, and C in the drum circumferential direction 2Y. Further, a pressure reducing mechanism (not shown) for reducing the pressure inside is connected to the drum body 20. The decompression mechanism includes an exhaust pipe (not shown) connected to a side wall (not shown) constituting the drum main body 20 and an exhaust fan (not shown) connected to the exhaust pipe. There is. The plurality of spaces A, B and C in the drum main body 20 are independent of each other, and the negative pressure (suction force) of the plurality of spaces can be independently adjusted by the pressure reducing mechanism.

The rotary drum 2 has a predetermined range in the drum circumferential direction 2Y, specifically, a space A in which the outer peripheral portion is covered with the duct 3, a stacking zone in which stacking of raw materials can be performed by suction from inside. It is done. When the outer peripheral member 21 is rotated around the rotation axis in a state in which the space A is maintained at a negative pressure, the accumulation concave 22 formed in the outer peripheral member 21 passes over the space A. The negative pressure in the space A acts on the bottom (the porous plate 23), and suction of air is performed through a large number of suction holes formed in the bottom. By the suction through the suction holes, the raw material transported in the supply path 32 in the duct 3 is guided to the accumulation recess 22 and piled on the bottom thereof. On the other hand, the space B of the rotary drum 2 is normally set to a negative pressure or pressure (zero atmospheric pressure) weaker than the space A, and the space C is the transfer position of the fiber material in the accumulation recess 22 and its The pressure is set to zero or positive pressure because it is an area including front and back.

The vacuum conveyor 6 is disposed at a position opposed to the endless air-permeable belt 63 stretched over the driving roll 61 and the driven roll 62 and the area where the space C of the rotary drum 2 exists with the air-permeable belt 63 interposed therebetween. And a vacuum box 64. A band-shaped core wrap sheet 10W is introduced onto the air-permeable belt 63, and the absorbent material 10 as a piled fiber released from the accumulation recess 22 is delivered onto the core wrap sheet 10W.

As shown in FIG. 2, the duct 3 extends continuously from the first supply mechanism 4 to the rotary drum 2, and includes an opening on the upstream side and a downstream side (rotary drum 2 side) in the raw material supply direction. There is an opening, and a flow path 30 of the raw material exists between these two openings. The top plate of the duct 3 is provided with a polymer scattering pipe 31 for supplying water absorbing polymer particles to the flow path 30. When the absorbent body 10 contains water absorbing polymer particles, this polymer scattering pipe 31 is used .

As described above, the absorbent body 10 contains two types of sheet pieces 11 and hydrophilic fibers 12 as a fiber material, and the manufacturing apparatus 1 correspondingly ducts the hydrophilic fibers 12 as a fiber material supply mechanism. A first supply mechanism 4 (hydrophilic fiber manufacturing device) for supplying the inside of the sheet 3 and a second supply mechanism 5 (sheet piece manufacturing device) for supplying the sheet piece 11 into the duct 3 are provided.

The first supply mechanism 4 (hydrophilic fiber producing device) is disposed at the opening of the duct 3 opposite to the rotary drum 2 side. The first feeding mechanism 4 is configured in the same manner as the feeding mechanism of the fiber material in the fiber laying device such as this type of pulp fiber, and is disintegrated to break up the strip-like raw material sheet 10as in which a plurality of hydrophilic fibers 12 are accumulated. A fiber machine 41 is provided.

The 2nd supply mechanism 5 (sheet piece manufacturing apparatus) is expanded and schematically shown by FIG. The second supply mechanism 5 is an apparatus for manufacturing and supplying the rectangular or cubic sheet piece 11, and as shown in FIG. 4, a strip-like raw material sheet 10bs composed of constituent fibers (synthetic fibers) of the sheet piece 11 is shown. An apparatus for carrying out a sheet piece manufacturing process described later in which cutting is performed in a predetermined length in two directions (first direction D1 and second direction D2) intersecting each other, the object to be cut (raw material sheet 10bs) A first cutting mechanism 5A for cutting into D1 and a second cutting mechanism which is disposed downstream of the first cutting mechanism 5A in the conveying direction MD of the object to be cut and cuts the object to be cut in the second direction D2 And a mechanism 5B. As raw material sheet 10bs, the nonwoven fabric by various manufacturing methods can be illustrated.

The “first direction D1”, which is one of the cutting directions of the raw material sheet 10bs, corresponds to the conveyance direction MD of the raw material sheet 10bs in the second supply mechanism 5, and the angle between the first direction D1 and the conveyance direction MD. Is less than 45 degrees. In the illustrated embodiment, the first direction D1 coincides with the transport direction MD, and the angle between the two directions D1 and MD is zero.
In addition, “the second direction D2” which is another one of the cutting direction of the raw material sheet 10bs is a direction intersecting the first direction D1, and in the illustrated embodiment, the first direction D1 (conveying direction MD) The second direction D2 is orthogonal to the second direction D2, and the angle between the two directions D1 and D2 is 90 degrees.
Further, a direction indicated by a code CD in FIG. 2 is a conveyance orthogonal direction orthogonal to the conveyance direction MD, and is a direction parallel to the rotation axes of various rolls included in the rotary drum 2 and the manufacturing apparatus 1. In the form, it coincides with the width direction (direction orthogonal to the longitudinal direction) of each of the long band shaped absorbent material 10 as the accumulated fiber and the long band shaped raw material sheet 10as, 10bs, and also coincides with the second direction D2. There is.

The first cutting mechanism 5A includes a cutter roll 51 and an anvil roll 52, as shown in FIGS. The two rolls 51 and 52 each have a substantially cylindrical shape, are rotatably supported about the rotation axis, and are arranged to rotate in opposite directions with the circumferential surfaces facing each other while aligning their rotation axes in parallel. It is done. While the cutter blade 51C is disposed on the circumferential surface of the cutter roll 51, the circumferential surface of the receiving roller 52 is smooth because the cutter blade is not disposed. In the first cutting mechanism 5A, the cutter blade 51C of the cutter roll 51 corresponds to the cutting direction so as to cut the material to be cut (raw material sheet 10bs) in the transport direction MD (first direction D1). It extends in the circumferential direction 51 and extends over the entire circumferential length of the circumferential surface of the roll 51. On the circumferential surface of the cutter roll 51, a plurality of cutter blades 51C are disposed at predetermined intervals in the conveyance orthogonal direction CD (second direction D2).

The 2nd cutting mechanism 5B is comprised including the cutter roll 53 and the anvil roll 54, as shown in FIG.2 and FIG.3. The two rolls 53 and 54 are rotatably supported around their respective rotation axes, and arranged so that their circumferential surfaces face each other and rotate in opposite directions while aligning their rotation axes in parallel. While the cutter blade 53C is disposed on the circumferential surface of the cutter roll 53, the circumferential surface of the receiving roller 54 is smooth without the cutter blade being disposed. In the second cutting mechanism 5B, the cutter blade 53C of the cutter roll 53 corresponds to the cutting direction so as to cut the object to be cut (the narrow sheet 10bt) in the conveyance orthogonal direction CD (second direction D2). It extends in the rotational axis direction of the roll 53, and extends from the central portion in the rotational axis direction on the circumferential surface of the roll 53 to both outer sides in the same direction. On the circumferential surface of the cutter roll 53, a plurality of cutter blades 53C are arranged at predetermined intervals in the circumferential direction of the roll 53.

The manufacturing method of the sheet piece 11 using the manufacturing apparatus 1 of the above structures is demonstrated with the manufacturing method of the absorber 10 using this manufacturing method. In the method of manufacturing the absorbent body 10, a sheet piece manufacturing process for obtaining the sheet piece 11 by cutting (cross-cutting) the strip-like raw material sheet 10bs, and conveying and accumulating the sheet piece 11 to a predetermined accumulation portion by air flow And an accumulation step. The said sheet piece manufacturing process is a process implemented according to the manufacturing method of the sheet piece of this invention. First, the sheet piece manufacturing process will be described.

The sheet piece manufacturing process in the method of manufacturing the absorbent body 10 of the present embodiment, that is, the method of manufacturing the sheet piece 11 is performed by the second supply mechanism 5 and, as shown in FIGS. The strip-like raw material sheet 10bs in which the fibers (synthetic fibers) are accumulated is cut in a first direction D1 (conveying direction MD) along the longitudinal direction of the raw material sheet 10bs to obtain a plurality of strip-like narrow sheets 10bt The sheet pieces 11 are manufactured by cutting the plurality of narrow sheets 10bt in the second direction D2 (conveying orthogonal direction CD) intersecting (in the illustrated embodiment, "orthogonal") in the first direction D1.

In the sheet piece manufacturing process performed by the second supply mechanism 5, as shown in FIG. 3, the sheet material 10bs is conveyed by the first cutting mechanism 5A while the strip-like raw material sheet 10bs is conveyed in one direction. A first cutting step of obtaining a plurality of strip-like narrow sheets 10bt by cutting along the MD, and conveying the narrow sheets 10bt in one direction, the second sheet 10bt by the second cutting mechanism 5B And a second cutting step of obtaining a plurality of sheet pieces 11 by cutting in a conveyance orthogonal direction CD orthogonal to the conveyance direction MD.

In the second supply mechanism 5, first, the raw material sheet 10bs being conveyed is transferred to the cutting portion 50A which is the closest portion of the

rolls

51 and 52 between the cutter roll 51 and the anvil roll 52 of the first cutting mechanism 5A. The plurality of narrow sheets 10bt extending in the same direction D1 are manufactured by cutting in the first direction D1 (see FIG. 4) which is the longitudinal direction of the sheet 10bs and is also the transport direction MD by the cutter blade 51C. Cutting process). The said 1st cutting process is implemented by introduce | transducing the raw material sheet 10bs between the cutter roll 51 and the anvil roll 52 (cutting part 50A) which rotate around a rotating shaft. The average width of the narrow sheets 10bt formed in the first cutting step (the average value of the lengths of the plurality of narrow sheets 10b in the conveyance orthogonal direction CD) is necessary for the sheet piece 11 to exhibit a predetermined effect. From the viewpoint of securing such dimensions, it is preferably 0.1 mm or more and 10 mm or less, more preferably 0.3 mm or more and 6 mm or less, and particularly preferably 0.5 mm or more and 5 mm or less. In the present embodiment, the width of the narrow sheet 10bt (the length in the conveyance orthogonal direction CD) cut by the cutter roll 51 of the first cutting mechanism 5A is the width of the sheet piece 11 finally formed. It corresponds to the side length of the direction. However, the width of the narrow sheet 10bt cut by the cutter roll 51 of the first cutting mechanism 5A is cut so as to correspond to the length of the longitudinal side of the sheet piece 11 finally formed. The average width of the narrow sheet 10bt cut by the cutter roll 51 in that case is preferably 0.3 mm or more and 30 mm or less, more preferably 1 mm or more and 15 mm or less, and 2 mm or more and 10 mm or less Is particularly preferred. The plurality of narrow sheets 10bt manufactured in this manner are conveyed to the second cutting mechanism 5B in a state of being arranged in parallel in the conveyance orthogonal direction CD.

Next, in the second cutting mechanism 5B, the plurality of strip-like narrow sheets 10bt manufactured in the first cutting step are both rolls between the cutter roll 53 and the anvil roll 54 of the second cutting mechanism 5B. At the cutting portion 50B which is the closest portion of 53 and 54, it is cut by the cutter blade 53C in the second direction D2 (see FIG. 4) which is the width direction of the narrow sheet 10bt and the transport orthogonal direction CD. A plurality of sheet pieces 11 having a predetermined length in the direction D2 are manufactured (second cutting step). FIG. 5 shows how a plurality of sheet pieces 11 are manufactured by cutting a plurality of narrow sheets 10bt traveling in parallel in the transport orthogonal direction CD by the cutter roll 53 in the second cutting mechanism 5B in the transport orthogonal direction CD. It is done. The second cutting step is performed by introducing the narrow sheet 10bt between the cutter roll 53 rotating around the rotation axis and the anvil roll 54 (cut portion 50B). In FIG. 5, reference numeral 530 indicates a roll main body of the cutter roll 53, and reference numeral 531 indicates a rotation axis of the cutter roll 53. Like the cutter roll 53, the

other rolls

51, 52, 54 in the second supply mechanism 5 also have a roll main body and a rotating shaft.

As described above, by sequentially cutting the strip-like raw material sheet 10bs in the first direction D1 and the second direction D2 orthogonal to this in the second supply mechanism 5, the raw material sheet 10bs is cut into a gauze shape as shown in FIG. The plurality of sheet pieces 11 have a rectangular parallelepiped shape or a cubic shape. The average length of the sheet pieces 11 formed in the second cutting step (the average value of the lengths of the plurality of sheet pieces 11 along the conveyance direction MD of the narrow sheets 10bt) is that the sheet pieces 11 have a predetermined effect. From the viewpoint of securing dimensions necessary for expression, etc., it is preferably 0.3 mm or more and 30 mm or less, more preferably 1 mm or more and 15 mm or less, and particularly preferably 2 mm or more and 10 mm or less. In the present embodiment, the length of the sheet piece 11 cut by the cutter roll 53 of the second cutting mechanism 5B corresponds to the length of the side of the sheet piece 11 in the longitudinal direction. However, the length of the sheet piece 11 cut by the cutter roll 53 of the second cutting mechanism 5B may be cut so as to correspond to the length of the short side of the sheet piece 11, in that case The length (width) of the sheet piece 10bh cut by the cutter roll 53 of the second cutting mechanism 5B is preferably 0.1 mm or more and 10 mm or less, and further preferably 0.3 mm or more and 6 mm or less Preferably, it is 0.5 mm or more and 5 mm or less.

In the method of manufacturing the absorbent body 10 of the present embodiment, as described above, after the method of manufacturing the sheet piece 11 is performed by the second supply mechanism 5 to complete the sheet piece manufacturing process, the second supply mechanism 5 is completed. The plurality of sheet pieces 11 manufactured in the first embodiment and the hydrophilic fibers 12 manufactured in the first supply mechanism 4 are accumulated in the accumulation recess 22 as the accumulation portion formed on the outer peripheral surface 2 f of the rotating drum 2 (Accumulation process).

More specifically, the plurality of sheet pieces 11 manufactured in the sheet piece manufacturing process are supplied to the flow path 30 in the duct 3 by the suction nozzle 8 and flow from the first supply mechanism 4 toward the rotary drum 2 It mixes with the hydrophilic fiber 12 which has scattered the path | route 30, and is accumulated in the recessed part 22 for accumulation | storage with the hydrophilic fiber 12 (accumulation process). The suction nozzle 8 is open at both ends in the length direction, and one of the openings 81 is near the cutting portion 50B which is the closest portion between the cutter roll 53 of the second cutting mechanism 5B and the anvil roll 54. , And communicates with the flow passage 30 in the duct 3 at the other opening (not shown). The plurality of sheet pieces 11 manufactured between the cutter roll 53 and the anvil roll 54 are taken into the suction nozzle 8 through the opening 81 and supplied into the duct 3. In the manufacturing apparatus 1, the connection position of the suction nozzle 8 and the duct 3 is between the rotary drum 2 and the first supply mechanism 4 as shown in FIG. It is the position of the side.

When water absorbent polymer particles are contained in the absorbent body 10, the polymer dispersion tube 31 (see FIG. 2) disposed in the duct 3 is used to flow the water absorbent polymer particles in the duct 3 in the accumulation step. It is supplied to the passage 30 and placed in the air flow flowing in the flow passage 30 toward the accumulation recess 22, and together with the sheet piece 11 and the hydrophilic fiber 12 separately supplied in the flow passage 30, the accumulation recess 22 Stacked

In the manufacturing method of the sheet piece 11 mentioned above (sheet piece manufacturing process in the manufacturing method of the absorber 10), the 2nd cutting process in the 2nd supply mechanism 5 (sheet piece manufacturing apparatus) which cross-cuts the raw material sheet 10bs, ie, In the step of cutting the plurality of strip narrow sheets 10bt in the conveyance cross direction (in the present embodiment, the conveyance orthogonal direction CD) intersecting the conveyance direction MD to obtain the plurality of sheet pieces 11, the narrow sheet 10bt is cut It is possible that a defect occurs and that the narrow sheet 10bt is not cut at a predetermined position but is conveyed to a predetermined accumulation portion in a long strip-like state, or a disadvantage such as winding around each portion of the manufacturing apparatus 1 such as the cutter roll 53 is generated. There is sex. Generally, in order to cut a sheet being conveyed in one direction at a predetermined cutting portion such as the cutting

portions

50A and 50B in the manufacturing apparatus 1 of this embodiment, the sheet needs to be under tension in the cutting portion In a general cutting device, by providing a sheet feed mechanism on the upstream side and downstream side of the cutting portion and conveying the sheet, it is possible to cut the sheet in a tensioned state at the cutting portion. However, since the sheet piece manufactured by this invention is about 30 mm or less in cutting pitch, it is difficult to provide a feed mechanism downstream from a cutting part. Therefore, as shown in FIG. 3, the narrow sheet 10bt, which is the object to be cut in the second cutting step, extends from the cutting portion 50A of the first cutting mechanism 5A to just before the cutting portion 50B of the second cutting mechanism 5B. Of the narrow sheet 10bt after being cut in the conveyance orthogonal direction CD for the first time by the cutting section 50B and being cut out of the first sheet piece although it is continuous in the conveyance direction MD and given a constant tension. Since the cut end is in a non-fixed state, the tension is insufficient. Therefore, when the cutter blade 53C is worn and deteriorated due to long-term use, it is presumed that a cutting defect easily occurs.

Therefore, in the present invention, attention is directed to the ratio of the peripheral speed of the cutter roll 53 in the second cutting mechanism 5B to the conveying speed of the narrow sheet 10bt to be cut to the cutting mechanism 5B, and this is appropriately controlled. Solved the problem of cutting defects of the narrow sheet 10bt. Specifically, the peripheral speed V1 (see FIG. 3) of the cutter roll 53 is the introduction speed V0 (see FIG. 3) between the cutter roll 53 and the anvil roll 54 of the narrow sheet 10bt (see FIG. 3). It is made faster than that, that is, the magnitude relation that "the peripheral velocity V1 of the cutter roll> the introduction velocity V0 of the object to be cut" is established. By adjusting the speed ratio, the strip-like narrow sheet 10bt to be cut is given sufficient tension to cut it in the direction intersecting with the transport direction MD, and the thin sheet by the second cutting mechanism 5B The width sheet 10bt can be stably cut, and the plurality of sheet pieces 11 of uniform size can be continuously and efficiently manufactured. The ratio of the peripheral velocity V1 to the introduction velocity V0 is preferably 1.1 or more, more preferably 1.2 or more, and preferably 4.0 or less, more preferably V1 or V0, assuming V1> V0. Is less than 3.5.

The peripheral velocity V1 of the cutter roll 53 and the introduction velocity V0 of the narrow sheet 10bt are not particularly limited, respectively, and may be appropriately adjusted according to the type, physical properties, etc. of the narrow sheet 10bt. For example, when the narrow sheet 10bt (raw material sheet 10bs) is a non-woven fabric, the peripheral velocity V and the introduction velocity V0 can be set as follows.
Peripheral speed V1: preferably 30 m / min or more, more preferably 50 m / min or more, and preferably 1000 m / min or less, more preferably 500 m / min or less. The introduction speed V0 is the same as the setting value of the peripheral speed V1. It can be set by the relationship between the peripheral velocity V1 and the introduction velocity V0.

In the second cutting mechanism 5B (sheet piece manufacturing apparatus) of the present embodiment, as shown in FIG. 3, the narrow sheet 10bt is placed between the first cutting mechanism 5A and the second cutting mechanism 5B. A feed mechanism 5C for feeding out from the upstream side to the downstream side of the transport direction MD is disposed, and the introduction speed V0 is adjusted by the feed mechanism 5C. Thus, by arranging the feed mechanism 5C at an intermediate position between the first cutting mechanism 5A (cutting portion 50A) and the second cutting mechanism 5B (cutting portion 50B), the conveyance stability of the narrow sheet 10bt is improved. In order to improve, cutting defects in the second cutting mechanism 5B are more effectively prevented.

The feeding speed of the narrow sheet 10bt by the feed mechanism 5C is usually the same as the introduction speed V0 of the narrow sheet 10bt to the cutter roll 53 (the second cutting mechanism 5B). Here, the delivery speed of the narrow sheet 10bt by the feed mechanism 5C means the speed on the surface of the delivered narrow sheet 10bt.

As shown in FIG. 3, the feed mechanism 5C is configured to include a pair of

rotating rolls

55, 55 disposed opposite to each other across the sheet conveyance path, and the narrow sheet 10bt introduced between the two

rolls

55, 55 is It is configured to be sandwiched by both

rolls

55, 55 and sent out to the downstream side in the transport direction MD. The feed mechanism 5C contacts and sends out the narrow sheet 10bt at the closest portion (nip portion) between the

rolls

55 and 55, and the closest portion is the narrow sheet 10bt and the narrow sheet 10bt. Contact portion 50C. One of the two

rolls

55, 55 may be connected to the drive source, and may be a drive roll that can rotate alone about the rotation axis, and the other may be a co-rolling roll that can not rotate around the axis. Both may be drive rolls.

From the viewpoint of ensuring the effect by the arrangement of the feed mechanism 5C more reliably, the cutting portion 50B of the raw material sheet 10bs in the second cutting mechanism 5B and the contact portion 50C between the narrow sheet 10bt in the feed mechanism 5C. A separation distance L2 (see FIG. 3) along the sheet conveyance path between them is a separation distance L1 along the sheet conveyance path between the contact portion 50C and the cutting portion 50B of the narrow sheet 10bt in the first cutting mechanism 5A. It is preferable to be shorter than (see FIG. 3). The ratio of the separation distances L1 and L2 is preferably 0.8 or less, and more preferably 0.5 or less as L2 / L1, on the assumption that L1> L2.

In the present embodiment, before the first cutting process, the tension during conveyance of the narrow sheet 10bt is stabilized, and the cutting failure in the second cutting mechanism 5B is more effectively prevented. A tension adjustment process is provided to adjust the tension of the raw material sheet 10bs. Specifically, as shown in FIG. 3, the tension adjustment mechanism 5D is disposed in the sheet conveyance path on the upstream side of the first cutting mechanism 5A in the conveyance direction MD, and the tension adjustment mechanism 5D tensions the raw material sheet 10bs. The tension at the time of conveyance of the narrow sheet 10bt formed by cutting the raw material sheet 10bs in the conveyance direction MD is stabilized by adjusting.

As shown in FIG. 3, the tension adjusting mechanism 5D includes two fixed

rolls

59A, 59A intermittently arranged in the transport direction MD, and a dancer roll 59B arranged between the both rolls 59A, 59A. ing. The dancer roll 59B is movable between the two

rolls

59A, 59A in a direction approaching the raw material sheet 10b being conveyed, and is also movable in the opposite direction to the approaching direction. By moving the dancer roll 59B between the two

rolls

59A, 59A in a direction approaching the raw material sheet 10bs being conveyed, the raw material sheet 10bs is pressed by the roll 59B, and the tension of the raw material sheet 10bs increases. Further, by moving in the opposite direction to the approaching direction, the tension is reduced. Such moving mechanism of the dancer roll 59B can be configured in the same manner as in the known dancer roll.

Hereinafter, other embodiments of the present invention will be described with reference to FIGS. 6 and 7. About the other embodiment mentioned below, a component different from the above-mentioned embodiment is mainly explained, the same component attaches the same numerals, and omits explanation. The description about the said embodiment is suitably applied to the component part which is not demonstrated in particular.

Another embodiment of the second supply mechanism 5 provided in the manufacturing apparatus 1 is shown in FIG. The second supply mechanism 5 shown in FIG. 6 differs from the second supply mechanism 5 shown in FIG. 3 in the configuration of the feed mechanism 5C. The feed mechanism 5C in the second supply mechanism 5 shown in FIG. 6 includes a pair of

rotary belts

56, 56 disposed opposite to each other across the sheet conveyance path, and the narrow width introduced between both

belts

56, 56 The sheet 10bt is moved by a predetermined distance in the same direction as the narrow sheet 10bt while holding the sheet 10bt between the

belts

56 and 56, and thereafter, the narrow sheet 10bt is fed to the downstream side in the transport direction MD. The pair of

rotary belts

56 and 56 are respectively endless belts and are wound around a plurality of (two) rotary rolls 57 and 57 intermittently arranged in the conveyance direction MD along the sheet conveyance path. In the vicinity of each rotating belt 56, a dancer roll 58 for adjusting the tension of the rotating belt 56 is disposed. The dancer roll 58 is movable in the direction approaching the rotating belt 56 and is also movable in the opposite direction to the approaching direction, and the rotation of the dancer roll 58 is adjusted by adjusting the moving direction and the amount of movement of the roll 58. By adjusting the tension of the belt 56, the holding force of the narrow sheet 10bt being conveyed by the pair of

rotating belts

56, 56 can be adjusted. When the rotating belt 56 as shown in FIG. 6 is used as means for contacting with the transported object (the narrow sheet 10bt) and feeding it out in the feeding mechanism 5C, a pair of rotating rolls 55 as shown in FIG. Compared to the case of using 55, the transport stability is further improved because the transport distance of the transported object in a relatively stable state is longer, and cutting defects in the second cutting mechanism 5B are further enhanced. It can be effectively prevented.
Moreover, as a feed mechanism, not only the said embodiment but a vacuum conveyor provided with a suction device which makes the rotation belt and the narrow sheet 10bt adsorb | suck not only in the said embodiment, for example can also be used.

FIG. 7 shows another embodiment of the cutter roll 53 in the second cutting mechanism 5B included in the manufacturing apparatus 1. In the embodiment shown in FIG. 5, the cutter blade 53C of the cutter roll 53 extends parallel to the rotation axis direction (the conveyance orthogonal direction CD) of the roll 53, but in the embodiment shown in FIG. It has a portion extending in a direction intersecting with the 53 rotational axis direction. More specifically, in the cutter roll 53 shown in FIG. 7, the plurality of cutter blades 53 </ b> C disposed on the circumferential surface extend in a direction intersecting with the rotational axis direction of the roll 53 without intersecting in plan view. It has a straight shape, and the entire cutter blade 53C extends in this direction.

When the plurality of cutter blades 53C in the cutter roll 53 extend in parallel to the rotational axis direction of the roll 53 as shown in FIG. 5, the cutter blade 53C is brought into contact with the narrow sheet 10bt to be cut. Immediately after cutting, there occurs a time in which there is no other cutter blade 53C in contact with the cut narrow sheet 10bt, so that it is impossible to instantaneously apply an appropriate tension to the narrow sheet 10bt. The conveyance stability of the sheet 10bt may be reduced, which may lead to cutting failure. On the other hand, in the case where the cutter blade 53C has a portion extending in the direction intersecting the rotational axis direction of the cutter roll 53 as shown in FIG. 7, the cutter blade 53C with respect to the narrow sheet 10bt being conveyed. However, the conveyance stability of the narrow sheet 10bt can be further improved, which can lead to the further prevention of the cutting failure. In order to obtain such an effect, it is sufficient that the cutter blade 53C has a portion extending in the direction intersecting with the rotational axis direction of the cutter roll 53, and the whole of the cutter blade 53C is shown in FIG. It does not have to extend in the direction intersecting the rotation axis direction. From that point of view, the cutter blade 53C may have, for example, a wave shape extending in parallel with the rotation axis direction of the cutter roll 53 in a plan view, in addition to the form shown in FIG.

From the viewpoint of more reliably achieving the function and effect by the device of the extension direction of the cutter blade 53C described above, the inclination angle of the cutter roll 53 with respect to the rotation axis direction in the extension direction of the cutter blade 53C is 3 ° or more is preferable, 5 ° or more is further preferable, and 50 ° or less is preferable, 30 ° or less is more preferable, 3 ° or more and 50 ° or less is preferable, and 5 ° or more and 30 ° or less is more preferable.

As mentioned above, although this invention was demonstrated based on the embodiment, this invention can be suitably changed, without being restrict | limited to the said embodiment. All parts that only the one embodiment described above has can be used mutually as appropriate. Further, the following appendices will be disclosed regarding the embodiment of the present invention described above.

<1> A first cutting process of obtaining a plurality of strip-like narrow sheets by cutting the raw material sheet along the transport direction by the first cutting mechanism while transporting the strip-like raw material sheet in one direction; And a second cutting step of obtaining a plurality of sheet pieces by conveying the narrow sheet in one direction and cutting the narrow sheet in a conveyance crossing direction intersecting the conveyance direction by a second cutting mechanism. A method of manufacturing a sheet piece,
The second cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface and an anvil roll disposed to face the cutter roll, and the second cutting step , By introducing the narrow sheet between the cutter roll rotating about an axis and the anvil roll;
The sheet strip manufacturing method, wherein the peripheral speed (V1) of the cutter roll is made faster than the introduction speed (V0) of the narrow sheet between the cutter roll and the anvil roll.
<2> A feed mechanism is disposed between the first cutting mechanism and the second cutting mechanism for feeding the narrow sheet from the upstream side to the downstream side in the conveying direction, and the feed mechanism is configured to The manufacturing method of the sheet piece as described in said <1> which adjusts introduction speed.
<3> A separation distance (L2) along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feed mechanism is the contact portion The method of manufacturing a sheet piece according to <2>, wherein the method is shorter than the separation distance (L1) along the sheet conveyance path between the first cutting mechanism and the cutting portion of the narrow sheet.
<4> A separation distance (L2) along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feed mechanism, and the contact portion The ratio of L2 / L1 to the separation distance (L1) along the sheet conveyance path between the first cutting mechanism and the cutting portion of the narrow sheet is preferably 0.8 or less, more preferably 0. The manufacturing method of the sheet piece as described in said <3> which is .5 or less.
<5> The feed mechanism is configured to include a pair of rotating rolls disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between both rolls is sandwiched by both rolls and the conveyance direction downstream thereof The method for producing a sheet piece according to any one of the above <2> to <4>, wherein the sheet piece is sent out to the side.
<6> The feed mechanism is configured to include a pair of rotating belts disposed opposite to each other across the sheet conveyance path, and the narrow sheet introduced between both belts is held by the both belts, the narrow width The sheet is moved by a predetermined distance in the same direction as the sheet, and thereafter, the narrow sheet is fed to the downstream side in the conveying direction. The sheet piece according to any one of <2> to <4>. Method.
<7> The method according to <6>, wherein the pair of rotating belts is an endless belt, and is wound around a plurality of rotating rolls intermittently arranged in the conveying direction along the sheet conveying path. .
<8> The feed mechanism is a vacuum conveyor including a rotating belt and a suction device for adsorbing the narrow sheet to the rotating belt, and the narrow sheet introduced between both belts is sandwiched by both belts. The sheet piece manufacturing method according to any one of <2> to <4>, wherein the sheet piece is fed to the downstream side in the conveying direction.

<9> The method for producing a sheet according to any one of <1> to <8>, further comprising: a tension adjusting step of adjusting the tension of the raw material sheet before the first cutting step.
<10> Any one of the items <1> to <9>, wherein the cutter blade of the cutter roll in the second cutting mechanism has a portion extending in a direction intersecting the axial direction of the cutter roll. The manufacturing method of the sheet piece as described in.
<11> In the extending direction of the cutter blade of the cutter roll in the second cutting mechanism, the inclination angle with respect to the rotation axis direction of the cutter roll is preferably 3 ° or more, more preferably 5 ° or more, and preferably The manufacturing method of the sheet piece as described in said <10> which is 50 degrees or less, More preferably, it is 30 degrees or less.
<12> The ratio of the peripheral speed (V1) of the cutter roll and the introduction speed (V0) of the narrow sheet between the cutter roll and the anvil roll is preferably 1.1 as V1 / V0. The method for producing a sheet piece according to any one of the above <1> to <11>, which is more preferably 1.2 or more, and preferably 4.0 or less, more preferably 3.5 or less.
<13> When the narrow sheet is a non-woven fabric, the peripheral velocity (V1) of the cutter roll is preferably 30 m / min or more, more preferably 50 m / min or more, and preferably 1000 m / min or less, more preferably The method for producing a sheet piece according to any one of the above <1> to <12>, which has a value of 500 m / min or less.
<14> The average value (average width) of the lengths in the conveyance cross direction of the plurality of narrow sheet pieces formed in the first cutting step is preferably 0.1 mm or more and 10 mm or less, more preferably 0. The method for producing a sheet piece according to any one of <1> to <13>, which is 3 mm or more and 6 mm or less, particularly preferably 0.5 mm or more and 5 mm or less.
<15> The average value (average length) of lengths along the transport direction of the plurality of sheet pieces formed in the second cutting step is preferably 0.3 mm or more and 30 mm or less, more preferably 1 mm or more and 15 mm The method for producing a sheet according to any one of the above <1> to <14>, which is particularly preferably 2 mm or more and 10 mm or less.

<16> A method of manufacturing an absorbent containing a plurality of sheet pieces,
A method of manufacturing an absorber, comprising the steps of conveying and accumulating sheet pieces manufactured by the manufacturing method according to any one of <1> to <15> by a flow of air to a predetermined accumulation portion.

<17> A first cutting mechanism for cutting a raw material sheet along one of the conveyance directions while conveying the belt-like raw material sheet in one direction, thereby forming a plurality of narrow narrow sheets; A plurality of strip-shaped sheet pieces are formed by cutting the narrow sheet, which is disposed downstream of the cutting mechanism in the transport direction and formed by the first cutting mechanism, in the transport cross direction intersecting the transport direction. An apparatus for manufacturing a sheet piece, comprising: a second cutting mechanism;
The second cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed opposite to the cutter roll, and both rolls rotating about an axis Configured to cut the narrow sheet introduced therebetween in the conveying cross direction,
An apparatus for producing a sheet strip, wherein the peripheral speed of the cutter roll is higher than the introduction speed of the narrow sheet between the cutter roll and the anvil roll.
<18> A feed mechanism is provided between the first cutting mechanism and the second cutting mechanism to feed the narrow sheet from the upstream side to the downstream side in the conveying direction, and the introduction mechanism The manufacturing apparatus of the sheet piece as described in said <17> which adjusts speed.
<19> A separation distance (L2) along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feed mechanism is the contact portion The manufacturing apparatus of the sheet piece as described in said <18> short compared with the separation distance (L1) along the sheet conveyance path between the cutting parts of this narrow sheet in said 1st cutting mechanism.
<20> A separation distance (L2) along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feed mechanism, and the contact portion The ratio of L2 / L1 to the separation distance (L1) along the sheet conveyance path between the first cutting mechanism and the cutting portion of the narrow sheet is preferably 0.8 or less, more preferably 0. The manufacturing apparatus of the sheet piece as described in said <19> which is .5 or less.
<21> The feed mechanism includes a pair of rotating rolls disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between both rolls is sandwiched by both rolls and the conveyance direction downstream thereof The apparatus for producing a sheet piece according to any one of the above <17> to <20>, which is configured to be fed to the side.
<22> The feed mechanism is configured to include a pair of rotating belts disposed opposite to each other across the sheet conveyance path, and the narrow sheet introduced between both belts is held by both belts while the narrow width is held. The sheet is moved by a predetermined distance in the same direction as the sheet, and thereafter, the narrow sheet is fed to the downstream side in the transport direction, and the sheet piece according to any one of <17> to <20> is produced. apparatus.
<23> The apparatus for manufacturing a sheet according to <22>, wherein the pair of rotary belts are endless belts and are wound around a plurality of rotary rolls intermittently arranged in the conveyance direction along the sheet conveyance path. .
<24> The feed mechanism is a vacuum conveyor provided with a rotating belt and a suction device for adsorbing the narrow sheet to the rotating belt, and the narrow sheet introduced between both belts is sandwiched by both belts. The apparatus for manufacturing a sheet piece according to any one of the above <17> to <20>, wherein the apparatus is configured to be fed to the downstream side in the transport direction.

<25> The sheet piece according to any one of <17> to <24>, further including a tension adjusting mechanism for adjusting the tension of the raw material sheet on the upstream side in the transport direction with respect to the first cutting mechanism. Production equipment.
<26> The sheet piece according to <25>, wherein the tension adjustment mechanism includes two fixed rolls intermittently arranged in the transport direction and a dancer roll disposed between the two rolls. Production equipment.
<27> Any one of the items <17> to <26>, wherein the cutter blade of the cutter roll in the second cutting mechanism has a portion extending in a direction intersecting the axial direction of the cutter roll. The manufacturing apparatus of the sheet piece as described in.
<28> In the extending direction of the cutter blade of the cutter roll in the second cutting mechanism, the inclination angle with respect to the rotation axis direction of the cutter roll is preferably 3 ° or more, more preferably 5 ° or more, and preferably The manufacturing apparatus of the sheet piece as described in said <27> which is 50 degrees or less, More preferably, it is 30 degrees or less.
<29> The ratio of the peripheral speed (V1) of the cutter roll and the introduction speed (V0) of the narrow sheet between the cutter roll and the anvil roll is preferably 1.1 as V1 / V0. The apparatus for producing a sheet piece according to any one of the above <17> to <28>, which is more preferably not less than 1.2, and preferably not more than 4.0, more preferably not more than 3.5.
<30> When the narrow sheet is a non-woven fabric, the peripheral velocity (V1) of the cutter roll is preferably 30 m / min or more, more preferably 50 m / min or more, and preferably 1000 m / min or less, more preferably The manufacturing apparatus of the sheet piece of any one of said <17>-<29> which is 500 m / min or less.
<31> The average value (average width) of the lengths in the conveyance cross direction of the plurality of narrow sheet pieces formed by the first cutting mechanism is preferably 0.1 mm or more and 10 mm or less, more preferably 0 . The apparatus for producing a sheet piece according to any one of the above <17> to <30>, which is 3 mm or more and 6 mm or less, particularly preferably 0.5 mm or more and 5 mm or less.
<32> The average value (average length) of the lengths along the transport direction of the plurality of sheet pieces formed by the second cutting mechanism is preferably 0.3 mm or more and 30 mm or less, more preferably 1 mm or more The manufacturing apparatus of the sheet piece of any one of said <17>-<31> which is 15 mm or less, especially preferably 2 mm or more and 10 mm or less.
<33> The first cutting mechanism includes a cutter roll rotatably supported around an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed opposite to the cutter roll, the first cutting. The cutter blade of the mechanism extends in the circumferential direction of the cutter roll of the first cutting mechanism, and extends over the entire circumferential length of the peripheral surface of the cutter roll. The manufacturing apparatus of the sheet piece of any one of these.
<34> The cutter blade of the second cutting mechanism extends in the rotational axis direction of the cutter roll in the second cutting mechanism, and in the circumferential surface of the cutter roll from the central portion in the rotational axis direction, the same direction The apparatus for manufacturing a sheet piece according to any one of the above <17> to <33>, which extends over both outer sides of the sheet.

ADVANTAGE OF THE INVENTION According to this invention, the cutting defect of a sheet | seat is suppressed and the several sheet piece of the intended size can be manufactured continuously continuously and efficiently.

Claims

A first cutting step of obtaining a plurality of strip-like narrow sheets by cutting the strip-like material sheet in one direction while conveying the strip-like material sheet in one direction; And a second cutting step of obtaining a plurality of sheet pieces by cutting the narrow sheet by a second cutting mechanism in a conveyance crossing direction crossing the conveyance direction while conveying the sheet in one direction. Manufacturing method of
The second cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface and an anvil roll disposed to face the cutter roll, and the second cutting step , By introducing the narrow sheet between the cutter roll rotating about an axis and the anvil roll;
A sheet strip manufacturing method, wherein the peripheral speed of the cutter roll is made faster than the introduction speed of the narrow sheet between the cutter roll and the anvil roll.
A feed mechanism is disposed between the first cutting mechanism and the second cutting mechanism for feeding the narrow sheet from the upstream side to the downstream side in the conveying direction, and the introduction speed is set by the feeding mechanism. The manufacturing method of the sheet piece of Claim 1 to adjust.
The separation distance along the sheet conveyance path between the cutting portion of the raw material sheet in the second cutting mechanism and the contact portion with the narrow sheet in the feeding mechanism is the contact portion and the first cutting mechanism. The method according to claim 2, wherein the distance between the narrow sheet and the cut portion of the narrow sheet is short as compared with the separation distance along the sheet conveyance path.
A separation distance along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feeding mechanism, the contact portion and the first cutting mechanism 4. The method according to claim 3, wherein the ratio of the separation distance between the narrow sheet and the cut portion of the narrow sheet along the sheet conveyance path is 0.8 or less as a ratio of the former to the latter.
The feed mechanism includes a pair of rotating rolls disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between the two rolls is nipped by both rolls and sent out to the downstream side in the conveyance direction. The method for producing a sheet piece according to any one of claims 2 to 4, which is carried out as described above.
The feed mechanism includes a pair of rotating belts disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between the two belts is held by the two belts in the same manner as the narrow sheet. The method for producing a sheet according to any one of claims 2 to 4, wherein the narrow sheet is fed to the downstream side in the transport direction after being moved by a predetermined distance in a direction.
The method according to claim 6, wherein the pair of rotary belts are endless belts and are wound around a plurality of rotary rolls intermittently arranged in the conveyance direction along the sheet conveyance path.
The feed mechanism is a vacuum conveyor provided with a rotating belt and a suction device for adsorbing the narrow sheet to the rotating belt, and the narrow sheet introduced between both belts is sandwiched by both belts and conveyed The method of manufacturing a sheet piece according to any one of claims 2 to 4, wherein the sheet is fed downstream in the direction.
The method for manufacturing a sheet piece according to any one of claims 1 to 8, further comprising a tension adjustment step of adjusting the tension of the raw material sheet before the first cutting step.
10. The sheet piece according to any one of claims 1 to 9, wherein the cutter blade of the cutter roll in the second cutting mechanism has a portion extending in a direction intersecting the axial direction of the cutter roll. Production method.
The method according to claim 10, wherein the inclination angle of the cutter roll relative to the rotation axis direction in the extending direction of the cutter blade of the second cutting mechanism is 3 ° or more and 50 ° or less. .
The ratio of the peripheral speed of the cutter roll to the introduction speed of the narrow sheet between the cutter roll and the anvil roll is 1.1 to 4.0 as a ratio of the peripheral speed to the introduction speed. The method for producing a sheet piece according to any one of claims 1 to 11, which is the following.
The narrow sheet is a non-woven fabric,
The method of manufacturing a sheet piece according to any one of claims 1 to 12, wherein a circumferential velocity of the cutter roll is 30 m / min or more and 1000 m / min or less.
A method of manufacturing an absorbent containing a plurality of sheet pieces, wherein
A method of manufacturing an absorber, comprising the steps of conveying and accumulating sheet pieces manufactured by the manufacturing method according to any one of claims 1 to 13 by a flow of air to a predetermined accumulation portion.
A first cutting mechanism for forming a plurality of strip-like narrow sheets by cutting the raw material sheet along the transport direction while transporting the strip-shaped raw material sheet in one direction, and the first cutting mechanism A second sheet forming the plurality of strip-shaped sheet pieces by cutting the narrow sheet formed by the first cutting mechanism in the conveyance cross direction intersecting the conveyance direction; What is claimed is: 1. A sheet piece manufacturing apparatus comprising: a cutting mechanism;
The second cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed opposite to the cutter roll, and both rolls rotating about an axis Configured to cut the narrow sheet introduced therebetween in the conveying cross direction,
An apparatus for producing a sheet strip, wherein the peripheral speed of the cutter roll is higher than the introduction speed of the narrow sheet between the cutter roll and the anvil roll.
A feed mechanism is provided between the first cutting mechanism and the second cutting mechanism for feeding the narrow sheet from the upstream side to the downstream side in the transport direction, and the feed speed is adjusted by the feed mechanism. The manufacturing apparatus of the sheet piece of Claim 15.
The separation distance along the sheet conveyance path between the cutting portion of the raw material sheet in the second cutting mechanism and the contact portion with the narrow sheet in the feeding mechanism is the contact portion and the first cutting mechanism. The apparatus for producing a sheet strip according to claim 16, wherein the apparatus is short as compared to the separation distance along the sheet conveyance path between the narrow sheet and the cut portion of the narrow sheet.
A separation distance along a sheet conveyance path between a cutting portion of the raw material sheet in the second cutting mechanism and a contact portion with the narrow sheet in the feeding mechanism, the contact portion and the first cutting mechanism The apparatus for manufacturing a sheet piece according to claim 17, wherein the ratio of the separation distance between the narrow sheet and the cut portion of the narrow sheet along the sheet conveyance path is 0.8 or less as a ratio of the former to the latter.
The feed mechanism includes a pair of rotating rolls disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between the two rolls is nipped by both rolls and sent out to the downstream side in the conveyance direction. The apparatus for manufacturing a sheet piece according to any one of claims 15 to 18, which is configured as described above.
The feed mechanism includes a pair of rotating belts disposed opposite to each other with the sheet conveyance path interposed therebetween, and the narrow sheet introduced between the two belts is held by the two belts in the same manner as the narrow sheet. The apparatus for manufacturing a sheet piece according to any one of claims 15 to 19, wherein the narrow sheet is fed to the downstream side in the transport direction after being moved by a predetermined distance in a direction.
21. The sheet piece manufacturing apparatus according to claim 20, wherein the pair of rotary belts is an endless belt and is wound around a plurality of rotary rolls intermittently arranged in the conveyance direction along the sheet conveyance path.
The feed mechanism is a vacuum conveyor provided with a rotating belt and a suction device for adsorbing the narrow sheet to the rotating belt, and the narrow sheet introduced between both belts is sandwiched by both belts and conveyed The apparatus for manufacturing a sheet piece according to any one of claims 15 to 18, wherein the sheet is fed downstream in the direction.
The apparatus for manufacturing a sheet piece according to any one of claims 15 to 22, further comprising a tension adjusting mechanism for adjusting the tension of the raw material sheet on the upstream side of the first cutting mechanism in the transport direction.
The apparatus according to claim 23, wherein the tension adjusting mechanism includes two fixed rolls intermittently arranged in the transport direction and a dancer roll disposed between the two rolls.
25. The sheet piece according to any one of claims 15 to 24, wherein the cutter blade of the cutter roll in the second cutting mechanism has a portion extending in a direction intersecting with the axial direction of the cutter roll. manufacturing device.
The sheet strip manufacturing apparatus according to claim 25, wherein the inclination angle of the cutter roll in the extending direction of the cutter blade in the second cutting mechanism with respect to the rotation axis direction of the cutter roll is 3 ° or more and 50 ° or less. .
The ratio of the peripheral speed of the cutter roll to the introduction speed of the narrow sheet between the cutter roll and the anvil roll is 1.1 to 4.0 as a ratio of the peripheral speed to the introduction speed. The apparatus for manufacturing a sheet piece according to any one of claims 15 to 26, which is the following.
The narrow sheet is a non-woven fabric,
The sheet piece manufacturing apparatus according to any one of claims 15 to 27, wherein a circumferential velocity of the cutter roll is 30 m / min or more and 1000 m / min or less.
The first cutting mechanism includes a cutter roll rotatably supported about an axis and having a cutter blade on a circumferential surface, and an anvil roll disposed opposite to the cutter roll, the first cutting mechanism The cutter blade extends in the circumferential direction of the cutter roll of the first cutting mechanism, and extends along the entire circumferential length of the circumferential surface of the cutter roll in any one of claims 15 to 28. The manufacturing apparatus of the described sheet piece.
The cutter blade of the second cutting mechanism extends in the rotational axis direction of the cutter roll in the second cutting mechanism, and in the circumferential surface of the cutter roll, both outer sides in the same direction from the central portion in the rotational axis direction. The apparatus for manufacturing a sheet piece according to any one of claims 15 to 29, which extends across the same direction.