JP2009248491A - Manufacturing method and apparatus of composite sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the manufacturing method of a composite sheet favorably manufacturing the composite sheet having specific recessed and projection shapes. <P>SOLUTION: In the manufacturing method of the composite sheet 1 where numerous recessed parts 1B are formed by joining the sheet 2 and 3 together, and protrusions 1A are formed in parts other than the recessed parts 1B on the sheet 2, when forming recessed and projection parts by feeding the sheet 2 between the rolls, while a roll 11 and a roll 12 having recessed and projection parts are rotated so that the recessed and projection parts are engaged with each other, the protrusions of the roll 12 are provided to be asymmetrical in relation to the center in the rotation shaft direction of the roll 11 at the recessed part of the roll 11 and/or in a direction crossing the direction, at the pressing-in position of the sheet 2 by the protrusions of the roll 12 to the recessed parts of the roll 11, after forming the recessed and projection parts on the sheet 2, the sheet 3 is superposed on it in a state that the sheet 2 is held on the roll 11 to partly join both sheets. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for manufacturing a composite sheet having a surface with an uneven shape.

  Two sheet-like objects are partially joined to form a large number of joints, and the first sheet-like material protrudes at a part other than the joints, and a large number of convex parts that are hollow inside are formed. The applicant has made various proposals regarding the production of the formed composite sheet (see, for example, Patent Document 1). Since such a composite sheet has a large number of irregularities formed on the surface, it is excellent in liquid leakage prevention and concealment properties when used for a surface sheet of an absorbent article.

See JP 2004-174234 A

  In the production of the composite sheet as described above, the present inventors have made various studies regarding the shaping of the concavo-convex shape on the sheet, and have completed the present invention.

  An object of this invention is to provide the manufacturing method and apparatus of a composite sheet which can manufacture suitably the composite sheet which has a specific uneven | corrugated shape.

  In the present invention, the first and second sheets are partially joined to form a large number of concave portions, and the first sheet has convex portions formed at least in a part other than the concave portions. The first sheet is supplied between the two rolls while rotating the first roll and the second roll having a concavo-convex portion on the peripheral surface portion so that the concave portion and the convex portion are engaged with each other. Then, when shaping the concave and convex shape, the convex portion of the second roll is changed to the first roll in the concave portion of the first roll at the position where the first sheet is pushed by the convex portion of the second roll into the concave portion of the first roll. A state in which the first sheet is held on the first roll after forming a concavo-convex shape on the first sheet, provided to be asymmetric with respect to the rotation axis direction and / or the center in the direction intersecting the direction. Then, the second sheet is overlaid on the first sheet. By providing a method of manufacturing a composite sheet supplying to join the two sheets partially to match, in which to achieve the above object.

  In the present invention, the first and second sheets are partially joined to form a large number of concave portions, and the first sheet has convex portions in portions other than the concave portions. An apparatus for producing a composite sheet, comprising a first roll and a second roll that have a concavo-convex portion on a peripheral surface portion and rotate so that the concave portion and the convex portion are engaged with each other. In the pushing position of the first sheet by the convex portion of the second roll, the convex portion of the second roll is in the rotation axis direction of the first roll in the concave portion of the first roll and / or the center in the direction intersecting with the direction. Thus, a composite sheet manufacturing apparatus provided to be asymmetrical is provided.

  In addition, the present invention is a composite sheet manufactured using the composite sheet manufacturing apparatus of the present invention, wherein the first and second sheets are partially joined to form a large number of concave portions. In the first sheet, a convex portion is formed in a portion other than the concave portion, and the convex portion provides a composite sheet in which slopes of opposing wall portions of the convex portion are different. is there.

  The present invention also provides an absorbent article in which the composite sheet of the present invention is used for a surface sheet.

  According to the method and apparatus for producing a composite sheet of the present invention, a composite sheet having a specific concavo-convex shape can be produced with good accuracy, stability and ease. The composite sheet produced according to the present invention can control the flow of the liquid depending on the shape of the irregularities formed, and the absorbent article of the present invention using it as a top sheet has a higher liquid leakage.

The present invention will be described below based on preferred embodiments with reference to the drawings.
First, the composite sheet manufacturing apparatus of the present invention (hereinafter also referred to as a manufacturing apparatus) will be described based on a preferred embodiment.

  As shown in FIG. 1, the manufacturing apparatus 10 of the present embodiment includes a first sheet (hereinafter also referred to as a sheet) 2 and a second sheet (hereinafter also referred to as a sheet) 3 as described later. And a plurality of concave portions 1B are formed, and a composite sheet 1 in which convex portions 1A and A ′ are formed on a part of the portion other than the concave portion 1B on the sheet 2 is manufactured. Device. As will be described later, in the composite sheet 1, the convex portion 1 </ b> A has different slopes of opposing wall portions, and the convex portion 1 </ b> A ′ does not have such a wall portion. Further, in the concave portion 1B of the composite sheet 1, a joining portion 1C in which the sheet 2 and the sheet 3 are joined is formed.

  The manufacturing apparatus 10 has a first roll (hereinafter also referred to as a roll) 11 and a second roll (hereinafter also referred to as a roll) that have a concavo-convex portion on the peripheral surface portion and rotate so that the concave portions and the convex portions are engaged with each other. ) 12 and an anvil roll 13. The roll 11 and the anvil roll 13 are arranged such that the top of the convex portion 11 </ b> A of the roll 11 is in contact with the peripheral surface of the anvil roll 13.

  As shown in FIGS. 2 and 3, the roll 11 is formed by combining a plurality of spur gears 111 and gear-like spacers 112 and attaching them concentrically to a rotating shaft 113 to form a roll. . Both the gear 111 and the spacer 112 have the same tooth width. The center of the gear 111 and the spacer 112 is open, and the rotating shaft 113 is inserted into the opening. The gear 111, the spacer 112, and the rotating shaft 113 are each formed with a notch (not shown), and a key (not shown) is inserted into the notch. As a result, idle rotation of the gear 111 and the spacer 112 is prevented.

  The tooth tip circle diameter of the spacer 112 is smaller than the tooth tip circle diameter of the gear 111. The number of teeth of the gear 111 is an integral multiple of the number of teeth of the spacer 112.

  In the roll 11, one gear 111 is arranged on each side of one spacer 112, and a plurality of gear groups 110, each of which is a set, are arranged. In FIG. 2, for convenience, three sets of gear groups 110 and gears 111 on both sides are shown, but the number of gear groups is set according to the width of the sheet 2, the shape of the unevenness to be shaped, and the like. The

  In each gear group 110, the gear 111 and the spacer 112 are arranged such that their teeth are arranged in parallel in the direction of the rotation axis of the roll. As a result, in each gear group 110, convex portions 11 </ b> A and concave portions 11 </ b> B are alternately formed along the rotation direction of the roll 11. The convex portion 11A is formed by the teeth of the two gears and the spacer being arranged in parallel in the rotation axis direction of the roll 11, or the teeth of the two gears 111 are arranged in the rotation axis direction of the roll. Is formed. On the other hand, the recess 11 </ b> B is formed between the teeth of the two gears 111. The width of the convex portion 11A determines the dimension in the width direction (Y direction) of the concave portion 1B of the composite sheet 1.

In the roll 11, the gear groups 110 are arranged so that the pitches of the concave and convex portions in the adjacent gear groups 110 and 110 are different from each other. In the present embodiment, the uneven portions of the adjacent gear groups 110 are shifted by a half pitch.
As shown in FIGS. 2 and 4, in the roll 11, gears 111 are arranged on both sides of the three sets of gear groups 110 so as to be shifted by a half pitch, and six teeth of each gear 111 (for convenience in FIGS. 2 and 4). A concave portion 11B is formed surrounded by a diagonal line on the surface.

  As shown in FIG. 2, in each gear group 110, a plurality of gap portions 114 are formed between the two gears 111 along the rotation direction of the roll 11 at a constant interval. Each gap 114 is formed by two gears 111 and a spacer 112 positioned between them. More specifically, each gap 114 is defined by opposing sides of the two gears 111 and two adjacent teeth on the spacer 112. Therefore, the same number of gaps 114 as the number of teeth of the spacer 112 are formed. The gap 114 opens outward in the recess 11B described above.

  It is more preferable that the gear group 110 is incorporated in the roll 11 so that the gap portion 114 is also arranged outside both sides of the sheet 2. In such a configuration, a suction force acts on both side portions of the sheet 2 from the gap portion 114, so that the side portions of the sheet 2 are not bent during the uneven shape forming process or in subsequent conveyance on the circumferential surface of the roll 11. Is prevented.

  A plurality of suction ports 115 are formed in the gear 111 so as to surround a central opening into which the rotation shaft 113 is inserted. Each suction port 115 has the same diameter, and is formed at a position equidistant from the center of the gear. The angles formed between adjacent suction ports 115 and the center of the gear are all equal. The number of suction ports 115 in each gear 111 is the same as the number of teeth of the spacer 112. And when each gear group 110 is assembled | attached, the gearwheel 111 and the spacer 112 are arrange | positioned so that each suction port 115 may be located between the adjacent teeth in the spacer 112, respectively. In this state where the gear groups 110 are assembled and the gear groups 110 are arranged so that the pitches of the concavo-convex portions are different from each other, the suction port 115 of each gear 111 is continuous in the rotation axis direction of the roll 11. Thus, a plurality of suction paths 116 extending in the rotation axis direction are formed inside the roll 11. Each suction path 116 communicates with the gap 114 described above. Therefore, the gap 114 can be regarded as constituting a part of the suction path 116.

  At least one end of the suction path 116 communicates with an intake source (not shown) such as a blower or a vacuum pump. Therefore, when a suction operation is performed by operating the intake source, intake is performed from the gap portion 114 through the suction path 116. Suction ports (not shown) are disposed on both sides of the roll 116. In this suction port, the sheet 2 is adsorbed to the peripheral surface portion of the roll 11 from the position of forming the concavo-convex shape to the sheet 2 by the rolls 11 and 12 to the joining position of the sheets 2 and 3 by the roll 11 and the anvil roll 13. As described above, the suction path 116 and the intake source are communicated with each other, and the communication between the suction path 116 and the intake source is blocked at other portions.

  The roll 11 of the present embodiment is particularly effective when a large number of small convex portions are formed with a small pitch, and even if a low module spur gear that is a gear with a small pitch and a small tooth size is used, The gap 114 can be enlarged by increasing the tooth width or decreasing the number of teeth. As a result, it is possible to sufficiently secure the expression of the suction force that holds the shaped state of the sheet 2 shaped as a concavo-convex shape by the engagement of the rolls 11 and 12. Furthermore, there is also an advantage that the pitch and size of the convex portions can be freely changed by a simple operation simply by changing the combination and width of the gears.

  As shown in FIG. 4, when the roll 12 is engaged with the roll 11, at the position where the sheet 2 is pushed by the convex portion of the roll 12 into the concave portion 11 </ b> B of the roll 11, at least a part of the convex portion of the roll 2 is The roll 11 is provided with a position shifted so as to be asymmetric with respect to the center Y11B in the rotation axis direction of the roll 11 and / or the center X11B in the direction intersecting the direction in the concave portion 11B of the roll 11, and both rolls are rotated together with the roll 11 If the uneven | corrugated shape can be shaped to the sheet | seat 2 supplied between, there will be no restriction | limiting in particular in the structure. In the following description, the convex portion of the roll 12 shifted in position is indicated by 12A, and the convex portion not shifted in position is indicated by 12A '. In FIG. 4, the X direction indicates the rotation direction of the rolls 11 and 12 (the direction intersecting the rotation axis), and the Y direction indicates the rotation axis direction of the rolls 11 and 12. 2, the X direction is the sheet length direction, and the Y direction is the sheet width direction.

  As shown in FIG. 5, the roll 12 has a center Y12A in the rotational axis direction of the roll 12 in the convex portion 12A and / or a center X12A in the direction intersecting the direction, the rotational axis direction of the roll 11 in the concave portion 11B of the roll 11. It is preferable to deviate from the center Y11B or the center X11B in the direction intersecting the direction. Regarding the amount of deviation between X12A in the convex portion 12A of the roll 12 and X11B of the concave portion 11B of the roll 11, and the amount of deviation between Y12A in the convex portion 12A of the roll 12 and Y11B of the concave portion 11B in the roll 11, the concave portion 11B and the convex portion 12A These are set according to the rotation axis direction, the dimension crossing the rotation axis direction, the material of the sheet 2 to be used, and the shape of the target convex portion.

  As shown in FIG. 5, in the present embodiment, the convex portion 12 </ b> A of the roll 12 does not contact the concave portion 11 </ b> B of the roll 11 at the position where the sheet 2 is pushed by the convex portion 12 </ b> A of the roll 12 into the concave portion 11 </ b> B of the roll 11. As shown in FIG. In the position, the convex portion 12A of the roll 12 is arranged with a gap so as not to contact both end surfaces of the concave portion 11B of the roll 11 in the rotation axis direction. The gap is 0.05 mm or more, In particular, the thickness is preferably 0.2 mm or more from the viewpoint of preventing unnecessary damage to the sheet 2. Further, it is desirable that the roll 11 and the roll 12 be arranged so that the concave bottom surface of the roll 11 and the convex top portion of the roll 12 do not contact each other.

  In the present embodiment, the roll 12 is formed by combining a plurality of gear groups in the same manner as the roll 11 so that a specific pushing position can be obtained when meshed with the roll 11 as described above. By adopting a structure in which a group of gears is combined with the roll 12, it is preferable in that a degree of freedom can be given to the roll 12 in the recess 11 </ b> B of the roll 11. Further, since errors in the thickness when processing the gear 111 and the spacer 112 are accumulated in the roll, it is possible to cope with the error in the roll 11 only by correcting the thickness of the spacer of the roll 12, and the unevenness of the roll The push-in position is easy and it is possible to cope with the minimum part processing. In the roll 12, the diameters of the tooth tips of the gears and the spacers are smaller than those of the roll 11, and the corresponding number of teeth is reduced. In addition, the suction path like the roll 11 is not formed in the roll 12.

  The anvil roll 13 includes heating means (not shown). And when the sheet | seat 2 and the sheet | seat 3 are clamped between the surrounding surface of the anvil roll 13 of the state heated by this heating means, and the convex part 11A of the roll 11, the sheet | seat 2 and the sheet | seat 3 are heat-seal | fused. Bonded to form a bonded portion 1C.

  Although not shown in the drawing, the manufacturing apparatus 10 includes a drive source that rotationally drives the rolls 11 and 12 and the anvil roll 13 at a predetermined rotational speed. The roll 12 may be a rotational rotation with respect to the meshing rotation with the roll 11.

  Next, the composite sheet and its manufacturing method (hereinafter also referred to as manufacturing method) of the present invention will be described based on an embodiment applied to the manufacture of a top sheet of an absorbent article using the manufacturing apparatus 10.

  In the composite sheet manufactured by the manufacturing method of the present embodiment, as shown in FIGS. 6A and 6B, the sheet 2 and the sheet 3 are partially joined to form a large number of concave portions 1B. In addition, convex portions 1A and 1A ′ are formed in a part of the sheet 2 other than the concave portion 1B. As shown in FIG. 6A, a joint 1 </ b> C in which the sheet 2 and the sheet 3 are joined is formed in one concave portion 1 </ b> B of the composite sheet 1.

The convex part 1A has the steep slope part 21 and the gentle slope part 22 as described above, the bottom part has a rectangular shape, and the ridge line is rounded as a whole.
As shown in FIG. 7, the convex portion 1A has a steep slope portion side in a region surrounded by a base line drawn between the joint portions and a perpendicular bisector of the base line in the vertical cross-sectional shape in the sheet width direction. The area S21 and the area S22 on the gentle slope portion side are preferably S21 / S22 = 1.1 to 10, particularly 1.1 to 5.

  Further, the angle θ21 of the steep slope portion of the wall portion of the convex portion 1A is set larger than the angle θ22 of the gentle slope portion. The angle θ21 of the steep slope is preferably 30 to 90 °, and particularly preferably 50 to 85 °. The angle θ22 of the gentle slope is preferably 10 to 50 °, and particularly preferably 20 to 35 °. The angle θ23 of the front and rear slope portions 23 in the sheet length direction of the convex portion 1A is preferably 20 to 90 °, and particularly preferably 45 to 85 °.

It is preferable that the height H of the convex portion 1A is 0.3 to 10 mm, particularly 0.7 to 5 mm. The bottom dimension (L) of the convex portion 1A in the sheet length direction (X direction) is preferably 1.5 to 30 mm, particularly preferably 2 to 5 mm, and the bottom dimension (W21 + W22) in the sheet width direction (Y direction). ) Is preferably 1.5 to 30 mm, particularly preferably 2 to 10 mm. Bottom area of the convex portion 1A is preferably 2.25~900mm ^2, in particular 4~50mm ^2.

  In the composite sheet 1, the slope direction of the gentle slope portion 22 is aligned in two directions, the convex portion 1 </ b> A is in the width direction of the composite sheet 1 so that the steep slope portion 21 faces and the gentle slope portion 22 faces outward. It is formed on both sides in the (Y direction).

  The convex portion 1A 'formed between the convex portions 1A is a flat rectangular parallelepiped or truncated quadrangular pyramid with rounded ridge lines as a whole. The angle θ24 of the wall portion of the convex portion 1A ′ is preferably 20 to 90 °, and particularly preferably 45 to 85 °. The height of the convex portion 1A 'is preferably the same as that of the convex portion 1A. Further, it is preferable that the bottom size of the convex portion 1A ′ in the sheet length direction (X direction), the bottom size in the sheet width direction, and the bottom area of the convex portion 1A ′ are the same as those of the convex portion 1A.

  In the composite sheet 1, the basis weight of the steep slope portion 21 is lower than the basis weight of the gentle slope portion 22. The basis weight of the steep slope portion 21 and the gentle slope portion 22 is calculated by cutting the steep slope portion 21 and the gentle slope portion 22 and measuring the cut area and weight. For the measurement, a plurality of (preferably 10 or more) steep slopes and gentle slopes are cut out to calculate the basis weights, respectively, and whether the basis weights of the steep slope part 21 and the gentle slope 22 are different from each other is compared. Further, whether or not the basis weight of the steep slope portion 21 is lower than the basis weight of the gentle slope portion 22 can be determined by measuring the number of fibers by microscopic observation of these portions.

  The form of the joint portion 1C formed in the concave portion 1B corresponds to the tip surface of the convex portion 11A of the roll 11, and is substantially rectangular in plan view.

  In the composite sheet 1, the convex portions 1 </ b> A, 1 </ b> A ′ and the concave portions 1 </ b> B appear alternately in a row in the sheet length direction (X direction) and are adjacent in the sheet length direction (X direction). The rows 1A and A ′ are staggered so as to be shifted by half a pitch in the sheet length direction (X direction). The concave portions 1B are also arranged in a staggered manner shifted in the length direction of the sheet by half a pitch. The length direction of the sheet coincides with the flow direction in the production process of the composite sheet 1 by the production apparatus 10 and, as will be described later, the longitudinal direction of the absorbent article when the composite sheet 1 is incorporated into the absorbent article. Is consistent with Since the convex portions 1A, 1A 'and the concave portion 1B are arranged in this manner, liquid leakage is extremely effectively prevented in the absorbent article including the composite sheet 1 as a top sheet.

Although there is no restriction | limiting in particular in the sheet | seat 2 which comprises the composite sheet 1, When using as a surface sheet of an absorbent article, the sheet | seat of the material used normally is used. Specific materials for the sheet 2 include various nonwoven fabrics such as a nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric manufactured by the card method. The fineness of the constituent fibers of the nonwoven fabric is preferably 1 to 20 dtex, particularly 1.5 to 4 dtex, from the viewpoint of ensuring the strength of the composite sheet 1 and improving the touch. The basis weight of the sheet 2 is preferably 10 to 100 g / m ² , particularly preferably 10 to 30 g / m ² .

Moreover, there is no restriction | limiting in particular also in the sheet | seat 3 which comprises the composite sheet 1, When using as a surface sheet of an absorbent article, the sheet | seat of the material used generally is used similarly. Specific examples of the material for the sheet 3 include nonwoven fabrics manufactured by the card method, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, and needle punched nonwoven fabrics. When a film is used, it is preferable to perforate the film to provide a large number of holes so that the liquid can be permeated. A laminate sheet of a nonwoven fabric and a film can also be used. The basis weight of the other sheet 3 is preferably 5 to 50 g / m ² , particularly preferably 10 to 30 g / m ² . Total basis weight of the composite sheet 1 including the sheet 2, and the other sheet 3, 15~150g / m ^2, it is particularly preferably 20 to 60 g / m ^2.

  In manufacturing the composite sheet 1 using the sheets 2 and 3, first, in the manufacturing apparatus 10, the roll 2 and the roll 12 are rotated at a predetermined rotation speed while the sheet 2 is supplied to the meshed portion, and the uneven shape is obtained. Is shaped.

  By forming the concavo-convex shape by the rolls 11 and 12, the convex portions 1A and 1A 'shown in FIG. 6 are formed. In the present embodiment, when the sheet 2 is pushed into the concave portion 11B of the roll 11 by the convex portions 12A on both sides of the roll 12, the convex portion of the roll 12 with respect to the concave portion 11B of the roll 11 that is a portion forming the convex portion 1A. Shift the pushing position of 12A. In this embodiment, since the center of the recess 11B in the rotational axis direction of the roll 11 is shifted to the inside of the roll 11, the sheet 2 is pushed into the recess 11B by the protrusion 12A and the convex shape is shaped. In this case, a basis weight difference is generated in the wall portion forming the convex portion 1A.

  That is, the basis weight of the portion formed in the direction in which the convex portion 12A is displaced from the concave portion 11B is lower than the basis weight of the portion formed in the opposite direction. The reason for this is that in the sheet 2 positioned in the direction in which the convex portion is displaced, the gap between the convex portion 12A of the roll 12 and the wall of the concave portion 11B of the roll 11 becomes narrower than the opposite side, and the convex portion 1A. This is because the inclination of the wall portion forming the steep portion becomes steep, and the deformation amount of the sheet 2 pushed into the concave portion 11B by the convex portion 12A becomes larger than the opposing side. On the other hand, on the side where the gap between the convex portion 12A and the concave portion 11B is set wide, the wall portion of the convex portion 1A is relatively gentle, and the deformation amount of the sheet 2 due to the pressing of the convex portion is also reduced. . For this reason, there is little change of basic weight, and the fall of basic weight is suppressed. Further, by changing the deformation amount of the sheet during pressing by changing the shape of the convex portion 12A to an asymmetric shape, the same basis weight change as described above can be expressed in the sheet having the uneven shape. The basis weight of the steep slope portion 21 of the convex portion 2 is lower than the basis weight of the gentle slope portion 22 by the mechanism of forming the uneven shape on the sheet 2 by the rolls 11 and 12.

  After forming the irregular shape, the sheet 2 is transported to the joining position with the sheet 3 by the anvil roll 13 while the sheet 2 is sucked and held on the peripheral surface of the roll 11 by the suction force through the suction path 116. Accordingly, the sheet 2 can be prevented from being lifted from the peripheral surface of the roll 11 before being bonded to the sheet 3, and can be bonded to the sheet 3 while maintaining a desired uneven shape. A composite sheet having an uneven shape is obtained.

  And the sheet | seat 3 is supplied so that it may overlap with this sheet | seat 2, these sheets are heat-seal | fused between the roll 11 and the anvil roll 13, and it joins partially, as shown in FIG.6 and FIG.7. The sheet 2 and the sheet 3 are partially joined to form a large number of concave portions 1B, and a convex portion 1A having a hollow inside is formed in a portion other than the concave portion 1B of the sheet 2, The composite sheet 1 in which 3 is joined at the joint 1C is manufactured.

  As described above, according to the method for manufacturing the composite sheet 1 using the manufacturing apparatus 10 of the present embodiment, the roll 11 and the roll 13 are formed after forming the concavo-convex shape on the sheet 2 while rotating the rolls 11 and 12. By simply joining the sheet 2 and the sheet 3 between them, a composite sheet in which convex portions having different slopes of opposing wall portions are formed can be suitably manufactured.

  Since the composite sheet 1 of the present embodiment manufactured by the above-described manufacturing method includes the convex portion having the gentle slope portion 22 and the steep slope portion 21, the flow of the liquid can be controlled and the touch property can be obtained. Excellent cushioning. In addition, the steep slope portion 21 has a higher liquid permeability because the basis weight is lower than that of the gentle slope portion 22, while the gentle slope portion 22 has a high basis weight and thus has a high liquid damming effect. For this reason, the liquid which entered the inside of the convex part 1A from the steep slope part 21 suppresses the surface liquid flow by the gentle slope part 22, and the movement of the liquid below is promoted. Therefore, the absorbent article using the composite sheet 1 as the top sheet is further improved in liquid leakage.

FIG. 8 shows an embodiment of the absorbent article of the present invention.
In the absorbent article 100 shown in FIG. 8, the absorbent main body 5 is disposed between the composite sheet 1 ′ as the top sheet and the back sheet 4.

  In the composite sheet 1 ′, the convex portion 1A having the steep slope portion and the gentle slope portion in the composite sheet 1 of the above embodiment has two rows on both sides in the width direction, and does not have the steep slope portion and the gentle slope portion. 1A ′ is formed in a three-row zigzag arrangement at the center, and a concave portion 1B is formed between the convex portions A and A ′. As the sheets constituting the composite sheet 1 ′, the same sheets as the sheets 2 and 3 similar to the composite sheet 1 of the above embodiment are used.

  As the back sheet 4 and the absorbent main body 5, those conventionally used for absorbent articles are used.

  The absorbent article 100 of the present embodiment is a composite sheet 1 in which convex portions 1A that can control the flow of liquid and have excellent liquid permeability are formed in a plurality of rows on both sides in the width direction. Since 'is used, liquid leakage is further improved.

The present invention is not limited to the embodiment.
For example, in the embodiment, the position of the convex portion 12A of the roll 12 that pushes the sheet 2 into the concave portion 11B of the roll 11 as shown in FIG. However, in the manufacturing apparatus of the present invention, the convex portion 12A of the roll 12 that pushes the sheet 2 into the concave portion 11B of the roll 11 intersects the rotation axis of the roll 11, as shown in FIG. By providing it so as to be asymmetric with respect to the center of the direction, the convex portion 1A of the composite sheet 1 can also be formed.

  In the manufacturing method and apparatus of the present invention, the shape of the convex portion 12A of the roll 12 (second roll) is set to the rotational axis direction of the roll 12 in the convex portion 12A of the roll 12 and / or the center in the direction intersecting the direction. And can be formed to be asymmetric. For example, as shown in FIG. 10, one side of the convex portion 12 </ b> A may be inclined so that the convex portion 12 </ b> A of the roll 12 is tapered toward the tip, or both sides may be inclined. In this case, as shown in FIG. 11, the convex portion can be formed so that the sheet is shaped along the shape of the convex portion 12A so that damage to the sheet is reduced during shaping. Furthermore, as shown in FIG. 12, the shape of the convex portion of the roll 12 can be asymmetric with respect to the center X <b> 12 </ b> A in the rotation direction of the roll 12.

  As shown in FIG. 13, the manufacturing apparatus of the present invention prepares a plurality of sets of gear groups 110, each of which includes one gear 111 and one spacer 112, so that the gears 111 and the spacers 112 alternate. Further, the first roll 11 ′ can be provided by attaching the teeth of the gear 111 adjacent to the rotary shaft to the axial direction of the roll 11 so as to be shifted by a half pitch. In this case, the concave portion 11B is formed by four teeth on the peripheral surface of the roll 11 '(each tooth becomes the convex portion 11A in the roll 11').

  The manufacturing method and apparatus of the present invention are not particularly limited as long as the first and second rolls for forming the uneven shape on the sheet can obtain a specific pushing position when the uneven portions as described above are engaged with each other. For example, a roll can also be comprised only with a gear without using any one or both as a spacer. Moreover, the manufacturing method and apparatus of this invention can also use the engraving roll formed integrally as a 1st, 2nd roll, for example.

  Further, in the composite sheet of the present invention, the inclination direction of the gentle slope portion of the convex portion may be aligned in only one direction or may be aligned in three or more directions depending on the use of the composite sheet.

  Moreover, the composite sheet of this invention may be formed only by the convex part which has a steep slope part and a gentle slope part.

  Further, in the composite sheet of the present invention, as in the composite sheet 1 of the above-described embodiment, the rows of the convex portions 1A and the concave portions 1B are preferably arranged so as to be shifted by a half pitch from the adjacent rows, They may be arranged at a pitch other than a half pitch or the same pitch (same phase).

  Moreover, in the said embodiment, although the composite sheet 1 was the two-layer structure of the sheet | seat 2 and the sheet | seat 3, one or two or more another which provides a predetermined function to the composite sheet 1 on the lower side of the sheet | seat 3 The sheets may be further laminated or joined.

  Further, the composite sheet of the present invention joins these sheets by adhesive bonding or ultrasonic bonding instead of joining the sheet 2 and the sheet 3 by heat fusion as in the above embodiment. Thus, a joint portion may be formed.

  Moreover, this invention is not restricted to the form where the length direction (X direction) of a sheet | seat corresponds with the longitudinal direction of an absorbent article like the said embodiment. For example, by forming a wide composite sheet and cutting it to a predetermined length and then changing the direction by 90 degrees, the Y direction of the composite sheet may coincide with the longitudinal direction of the absorbent article.

  The composite sheet of the present invention can be used not only as a surface sheet of an absorbent article as in the above embodiment, but also as other constituent members such as an exterior material of the absorbent article and a disposable clothing sheet.

It is a schematic diagram which shows the principal part in one Embodiment of the manufacturing apparatus of the composite sheet of this invention with the manufacturing method of a composite sheet. It is a perspective view which shows one form of the 1st roll in the manufacturing apparatus of the composite sheet shown in FIG. It is a disassembled perspective view of a 1st roll. It is a figure which shows the pushing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll, (a) is a roll partial expansion | deployment top view which shows the relationship between the recessed part of a roll, and the front-end | tip shape of a convex part, (b) ) Is a longitudinal sectional view of the main part. It is a top view for demonstrating the positional relationship of the convex part and a recessed part in the pressing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll. It is a schematic diagram which shows one Embodiment of the composite sheet of this invention, (a) is sectional drawing of the width direction of a composite sheet, (b) is a side view of a composite sheet. It is a schematic diagram which shows the form of the convex part in one embodiment of the composite sheet of this invention. It is sectional drawing which shows typically one Embodiment of the absorbent article of this invention. It is a figure which shows the pushing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll in other embodiment of the manufacturing apparatus of the composite sheet of this invention, and the relationship between the concave part of a roll and the shape of a convex part It is a roll partial expansion | deployment top view which shows. It is a figure which shows the pushing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll in other embodiment of the manufacturing apparatus of the composite sheet of this invention, and is a longitudinal cross-sectional view of the principal part. It is a figure which shows the pushing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll in other embodiment of the manufacturing apparatus of the composite sheet of this invention, and is a longitudinal cross-sectional view of the principal part. It is a figure which shows the pushing state of the sheet | seat to the recessed part of the 1st roll by the convex part of a 2nd roll in other embodiment of the manufacturing apparatus of the composite sheet of this invention, and is a side view of the principal part. It is a perspective view which shows the other form of the 1st roll in the manufacturing apparatus of the composite sheet of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite sheet 1A, 1A 'Convex part 1B Concave part 1C Joint part 2 1st sheet 21 Steep slope part 22 Slow slope part 3 2nd sheet 10 Composite sheet manufacturing apparatus 11 1st roll 11A Convex part 11B Concave part 12 2nd roll 12A, 12A 'Convex part 12B Concave part 13 Anvil roll 100 Absorbent article

Claims (10)

The first and second sheets are partially joined to form a number of concave portions, and the first sheet has a convex portion formed on at least a part of a portion other than the concave portions. A manufacturing method of
When forming the concavo-convex shape by supplying the first sheet between the two rolls while rotating the first roll and the second roll having the concavo-convex portion on the peripheral surface portion so that the concave portion and the convex portion are engaged with each other,
In the pushing position of the first sheet by the convex part of the second roll into the concave part of the first roll, the convex part of the second roll is moved in the rotational axis direction of the first roll in the concave part of the first roll and / or in this direction. Set up to be asymmetric with respect to the center of the intersecting direction,
A composite sheet that forms a concave and convex shape on the first sheet and then supplies the second sheet to the first sheet in a state where the first sheet is held on the first roll to partially join both sheets. Manufacturing method.   The rotation axis direction of the second roll and / or the center of the direction intersecting the second roll in the convex part of the second roll is the rotation axis direction of the first roll in the concave part of the first roll or the direction intersecting the direction. The manufacturing method of the composite sheet of Claim 1 shifted from the center.   The shape of the convex part of the second roll is formed so as to be asymmetric with respect to the rotation axis direction of the second roll in the convex part of the second roll and / or the center in the direction intersecting the direction. The manufacturing method of the composite sheet of description. An apparatus for manufacturing a composite sheet in which a plurality of concave portions are formed by partially joining the first and second sheets, and convex portions are formed in portions other than the concave portions in the first sheet. Because
It has a first roll and a second roll that have a concavo-convex part on the peripheral surface part and rotate so that the respective concave part and convex part mesh with each other,
In the pushing position of the first sheet by the convex part of the second roll into the concave part of the first roll, the convex part of the second roll is the rotation axis direction of the first roll in the concave part of the first roll and / or the direction. An apparatus for manufacturing a composite sheet provided to be asymmetric with respect to the center in the intersecting direction. A composite sheet manufactured using the composite sheet manufacturing apparatus according to claim 4,
The first and second sheets are partially joined to form a large number of concave portions, and the first sheet has convex portions formed in portions other than the concave portions,
The convex portion is a composite sheet in which slopes of opposing wall portions of the convex portion are different.   The composite sheet according to claim 5, wherein the wall portion of the convex portion has a steep slope portion and a gentle slope portion, and the slope direction of the gentle slope portion is aligned in one direction.   The composite sheet according to claim 5, wherein the wall portion of the convex portion has a steep slope portion and a gentle slope portion, and the slope directions of the gentle slope portion are aligned in a plurality of directions.   The composite sheet according to claim 7, wherein the convex portion is formed so that the steep slope portions of the wall portion face each other and the gentle slope portion faces outward.   The composite sheet according to claim 5, wherein a basis weight of the steep slope portion in the wall portion is lower than a basis weight of the gentle slope portion.   An absorbent article in which the composite sheet according to any one of claims 5 to 9 is used as a top sheet.

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