JP5596771B2 - Stretchable sheet manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to the manufacture of a stretchable sheet in which a plurality of elastic members are arranged in an expanded state between sheets and have a non-stretchable portion by cutting the elastic members.

  Conventionally, in an absorbent article such as a disposable diaper, a stretchable sheet has been used in order to improve adhesion to a wearer of a predetermined portion such as a waist portion and a waistline portion, and the nonwoven fabric is used as the stretchable sheet. There is known a configuration in which a plurality of thread-like or belt-like elastic members are arranged in an expanded state on a non-stretchable sheet that does not originally have stretchability, such as plastic film. In addition, as a stretchable sheet, not only a sheet having stretchability as a whole, but also a stretchable sheet that has stretchability only in necessary portions and has a non-stretchable portion that does not have stretchability is known. .

  For example, in Patent Document 1, as a method for producing a stretchable sheet having a non-stretchable portion, between a first roll having a plurality of convex portions arranged on the surface and a second roll facing the first roll, The elastic member of the laminated body is cut by pressurization between the convex portion of the first roll and the second roll. A method is described. In FIG. 4 and the like of Patent Document 1, it is described that the convex portions are arranged in a staggered manner on the peripheral surface of the first roll, and each convex portion arranged in the staggered manner is described in the convex portion. The top portion that comes into contact with the laminate is formed in a linear shape (rectangular shape) or a rhombus shape extending in the direction of the rotation axis of the first roll in plan view.

  Further, Patent Document 2 discloses a first roll in which a convex group is formed in a predetermined area on the outer peripheral surface for the purpose of forming a region having different expansion and contraction characteristics in a predetermined portion of the sheet, and a second facing the first roll. A laminated body in which a plurality of elastic members are stretched between the sheets is passed between the rolls, and the elastic members of the laminated body are connected to the convex portions constituting the convex group and the second In the method of cutting by pressurizing between rolls, as the convex portion group, a convex row, in which a plurality of convex portions are arranged along the rotation axis direction of the first roll, is spaced in the circumferential direction. Adopting a plurality of rows, and at least one of the convex portions constituting the row of convex portions located at the most downstream in the circumferential direction in the convex portion group is a peripheral portion of the convex portion. Whether the position of the downstream end in the direction is the position of the downstream end in the other convex part constituting the convex part row It has been described to be staggered.

JP 2002-35029 A JP 2010-240112 A

  In the first roll described in Patent Document 1 (a roll having a plurality of convex portions arranged on the surface), a plurality of convex portions are arranged at predetermined intervals in the rotation axis direction of the roll to form a convex row. Since the plurality of convex portions constituting the convex row are in contact with the laminate at the same time, the load (linear pressure) assigned to each convex portion is relatively small, and the elastic member of the laminate may not be cut. There is. Moreover, although the technique described in Patent Document 2 has a relatively large load (linear pressure) assigned to each convex portion by devising the convex portion pattern, the elastic member can be cut more reliably. , The load is too large, and there is a possibility of causing chipping or abrasion of the convex portion. Such chipping / abrasion of the convex portion due to the load is particularly caused by the frontmost convex portion located at the forefront portion in the rotational direction of the roll provided with the convex portion and first contacting the work sheet. It is noticeable. In a stretchable sheet manufacturing apparatus provided with a convex portion that presses and cuts an elastic member, no technology has yet been provided that makes it difficult for the convex portion to be chipped or worn, and to reliably cut the elastic member.

  Accordingly, an object of the present invention is to provide an apparatus and a manufacturing apparatus for a stretchable sheet that includes a convex portion that presses and cuts an elastic member, and that the convex portion is not easily chipped or worn, and that can reliably cut the elastic member. It is to provide a method.

  The present invention is used to manufacture a stretchable sheet having a non-stretchable portion by cutting a composite sheet in which a plurality of elastic members are arranged in an expanded state between the sheets, and the elastic member is An apparatus for manufacturing a stretchable sheet comprising a cutting means for cutting, wherein the cutting means includes a first roll having a plurality of protrusions projecting from a peripheral surface thereof, and a second roll facing the first roll. And a convex group in which a plurality of the convex portions are arranged in a regular pattern is formed on a part of the circumferential direction of the peripheral surface of the first roll. In the regular pattern, a plurality of convex portions are arranged at predetermined intervals in the intersecting direction intersecting both the rotation axis direction and the circumferential direction of the first roll. A predetermined interval in a direction intersecting the direction and in a direction other than the rotation axis direction and the circumferential direction The pattern is formed in a plurality of rows at the front, and is located at the forefront portion in the rotation direction of the first roll among the plurality of convex portions constituting the convex portion group, and first contacts the composite sheet. The foremost convex part is a straight line whose front end in the rotational direction at the top is parallel to the rotational axis direction of the first roll, and other convex parts other than the foremost convex part in the convex part group are The front end in the rotational direction of the top portion is a corner portion constituted by two sides intersecting each other, and the two sides both intersect in both the rotational axis direction and the circumferential direction. The manufacturing apparatus of this is provided.

  The present invention also provides a composite sheet manufacturing process for manufacturing a composite sheet in which a plurality of elastic members are arranged in an expanded state between the sheets, and forming the non-stretchable portion in the composite sheet by cutting the elastic member of the composite sheet. A non-stretchable portion forming step, wherein the non-stretchable portion forming step is performed using the manufacturing apparatus, and the composite sheet is rotated in the non-stretchable portion forming step. The elastic member of the composite sheet is caused to pass between the first roll and the second roll, and is pressed by the convex portion constituting the convex portion group and the peripheral surface of the second roll. The manufacturing method of the elastic sheet which cut | disconnects is provided.

  According to the present invention, there is provided a manufacturing apparatus and a manufacturing method for a stretchable sheet that includes a convex portion that presses and cuts an elastic member, and that the convex portion is less likely to be chipped and worn, and that can reliably cut the elastic member. Provided.

FIG. 1 is a schematic perspective view of an embodiment of the method for producing an elastic sheet of the present invention using an embodiment of the apparatus for producing an elastic sheet of the present invention. FIG. 2 is a schematic side view of the first roll shown in FIG. FIG. 3 is a plan view schematically showing an example of a pattern of convex portions in the first roll shown in FIG. FIG. 4 is a plan view schematically showing another example of the pattern of convex portions in the first roll according to the present invention.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The outline of the manufacturing apparatus 1 of the elastic sheet of this embodiment is shown by FIG. The manufacturing apparatus 1 according to this embodiment is used for manufacturing a stretchable sheet 10 in which a plurality of elastic members 13 are arranged in an extended state between sheets 11 and 12 and have a non-stretchable portion 14 by cutting the elastic member 13. The cutting means 3 for cutting the elastic member 13 is provided.

  The manufacturing method of the stretchable sheet 10 includes a composite sheet manufacturing process for manufacturing a composite sheet 10A in which a plurality of elastic members 13 are arranged in an expanded state between the sheets 11 and 12, and the elastic member 13 of the composite sheet 10A is cut. A non-stretchable portion forming step of forming the non-stretchable portion 14 on the composite sheet 10A, the cutting means 3 of the manufacturing apparatus 1 is a means for performing the non-stretchable portion forming step, and the manufacturing apparatus In addition to the cutting means 3, 1 further comprises a composite sheet manufacturing means 2 as means for carrying out the composite sheet manufacturing process.

  The composite sheet manufacturing means 2 is disposed upstream of the cutting means 3 in the MD (Machine Direction), and includes a conveying means (not shown) for the sheets 11 and 12 and an elastic member 13 including a guide roll 21. It includes a conveying means, an adhesive applying means 22 for applying an adhesive to the sheet 11, and a pair of upper and lower nip rolls 23, 23 to which the constituent members 11, 12, 13 of the composite sheet 10A are joined. . The configuration of the composite sheet manufacturing means 2 is basically the same as that in an apparatus for manufacturing this type of stretchable sheet (a sheet having a configuration in which a plurality of elastic members are arranged in an expanded state on the sheet).

  In the composite sheet manufacturing means 2, as shown in FIG. 1, while the belt-like sheet 11 continuously supplied from an original fabric roll (not shown) is conveyed in the sheet conveying direction indicated by reference numeral MD in FIG. An adhesive such as a hot melt adhesive is applied to one surface of the sheet 11 (opposite surface to the sheet 12) by the adhesive applying means 22, and the sheet 11 coated with the adhesive is placed between the pair of nip rolls 23 and 23. Transport. Further, each of a plurality (seven in the illustrated embodiment) of the thread-like elastic members 13 is stretched at a predetermined elongation rate by applying a predetermined tension, and the plurality of elastic members 13 in the expanded state are passed through the guide roll 21. It conveys between a pair of nip rolls 23 and 23. Separately, a belt-like sheet 12 having the same length of a sheet 11 and a CD (Cross machine Direction) is conveyed from above the sheet 11 to a pair of nip rolls 23 and 23. CD is a direction orthogonal to MD, and is parallel to rotation axes 51 and 61 (rotation axis direction A) of rolls 5 and 6 described later. In this way, the two strip-shaped sheets 11 and 12 and the plurality of elastic members 13 in an extended state sandwiched between the two sheets 11 and 12 are fed between the pair of nip rolls 23 and 23 and are pressed by both the rolls 23 and 23. Thereby, each member 11,12,13 is mutually crimped | bonded via an adhesive agent, and 10 A of strip | belt-shaped composite sheets are obtained. The adhesive may be applied to the sheet 12, may be applied to both the sheet 11 and the sheet 12, or may be applied to the plurality of elastic members 13. The elastic member 13 is disposed along the MD. In other words, the elastic member 13 extends in the circumferential direction R of the first roll 5 described later.

  The cutting means 3 included in the manufacturing apparatus 1 is used to cut the elastic member 13 of the composite sheet 10A manufactured using the composite sheet manufacturing means 2 in this way, and to form the non-stretchable portion 14 in the composite sheet 10A. As shown in FIG. 1, there are provided a first roll 5 having a plurality of protrusions 4 projecting from its peripheral surface, and a second roll 6 facing the first roll 5. . The peripheral surface of the second roll 6 does not have an uneven shape, and is substantially (macroscopic) smooth.

  More specifically, as shown in FIG. 1, the cutting means 3 includes a first roll 5 having a cylindrical rotating body 52 that is rotatably supported in a direction R <b> 1 around the rotating shaft 51, and a rotating shaft 61. A second roll 6 having a cylindrical rotating body 62 that rotates in the direction R2 in synchronism with the roll 5 and when both rolls 5 and 6 (rotating bodies 52 and 62) are rotating. In addition, the elastic member 13 of the composite sheet 10A supplied between the two rolls 5 and 6 is cut by pressurization between the convex portion 4 of the roll 5 and the peripheral surface of the roll 6 (rotating body 62). Yes. Both rolls 5 and 6 are provided so as to rotate synchronously when a driving force from a driving means (not shown) is transmitted to the rotating shafts 51 and 61.

  Each member (the convex part 4, the rotating shafts 51 and 61, the rotating bodies 52 and 62, the process part 53 mentioned later etc.) which comprises both the rolls 5 and 6 is metal, such as various tool steels (iron and steel), such as die steel. The rigid body is configured. In this embodiment, each of the rolls 5 and 6 is provided with heating means (not shown) such as a heater inside, and passes between the rolls 5 and 6 by heat conduction from the heating means. Heat is transmitted to the composite sheet 10A. However, in the present invention, such a heating means is not essential, and neither of the rolls 5 and 6 may be provided with a heating means, or only one of them may be provided with a heating means. good.

  From the viewpoint of improving the cutting performance of the elastic member 13 of the composite sheet 10A supplied between both rolls 5 and 6, the heating temperature of the convex portion 4 of the first roll 5 by the heating means is as follows. Preferably they are 30 degreeC or more and 200 degrees C or less, More preferably, they are 50 degreeC or more and 120 degrees C or less. The reason why the upper limit (200 ° C.) is provided for the heating temperature of the convex portion 4 is to prevent the composite sheet 10A (sheets 11 and 12) from melting and adhering to and growing on the rolls 5 and 6. When the nonwoven fabric is used for the sheets 11 and 12, it is preferable that the upper limit of the heating temperature of the convex portion 4 is not higher than the melting point of the constituent material, for example, 130 ° C. or lower if the constituent material is polyethylene. It is preferable.

  In the cutting means 3, as shown in FIG. 1, the strip-shaped composite sheet 10A obtained by using the composite sheet manufacturing means 2 is a first roll 5 that rotates in the direction R1 and a second roll that rotates in the direction R2. The elastic member 13 of the composite sheet 10A is caused to pass between the rolls 6 and pressed by the convex portions 4 constituting the convex portion group 4P described later and the peripheral surface of the second roll 6 (rotating body 62). It cut | disconnects and forms the non-stretching part 14 in this composite sheet 10A (non-stretching part formation process). In the non-stretchable portion forming step of this embodiment, as described above, the heating member attached to both the rolls 5 and 6 is used, and the elastic member 13 is formed by pressurization with both rolls 5 and 6 and heating by the heating unit. Disconnected. In this way, by forming the non-stretchable portion 14 in the composite sheet 10A, the target stretchable sheet 10 (a plurality of elastic members arranged in an expanded state on the sheet and having a non-stretchable portion by cutting the elastic member) Sheet).

  The first roll 5 which is one of the main features of the present invention will be further described. As shown in FIGS. 1 to 3, a part of the circumferential surface R of the peripheral surface of the first roll 5 (rotating body 52). A convex portion group 4P is formed in which a plurality of convex portions 4 are arranged in a regular pattern. More specifically, the first roll 5 (rotating body 52) includes a plurality (two in the illustrated embodiment) of processing portions 53 that are formed on the peripheral surface thereof so as to protrude at substantially equal intervals in the circumferential direction R. And the convex part 4 (convex part group 4P) is formed in the upper surface of each process part 53. As shown in FIG. That is, in the illustrated embodiment, a plurality of (two) convex portion groups 4 </ b> P are formed on the circumferential surface of the first roll 5 at substantially equal intervals in the circumferential direction R, and the circumferential surface of the first roll 5. The convex part 4 is not formed in parts other than the process part 53 in FIG. The pattern of the convex portion 4 in each of the plurality of convex portion groups 4P is the same.

  Each of the plurality of convex portions 4 has a top portion 40 that comes into contact with the composite sheet 10 </ b> A, and the convex portion 4 is cut when the convex portion 4 is cut along the peripheral surface of the roll 5 (rotating body 52). The area has a trapezoidal shape that gradually increases from the top 40 toward the rotation shaft 51 of the first roll 5. The top portion 40 of each convex portion 4 has a quadrangular shape in plan view, and the side surface 40s of the trapezoidal convex portion 4 faces from the four sides constituting the top portion 40 of the quadrangular shape in plan view toward the rotating shaft 51. Extending diagonally. Here, “plan view” means that the object (the convex portion 4 or the like) is perpendicular to the normal direction of the peripheral surface of the first roll 5 (rotating body 52) (the rotation axis direction A of the first roll 5). Means from the outside.

  As described above, the convex portion group 4P is formed by arranging a plurality of convex portions 4 in a regular pattern. As shown in FIG. A plurality of convex portions 4 </ b> X are arranged at a predetermined interval W <b> 1 in the intersecting direction X intersecting both the rotation axis direction A and the circumferential direction R of the first roll 5. The pattern is formed in a plurality of rows at a predetermined interval W2 in the direction Y that intersects with the rotation axis direction A and the direction Y other than the circumferential direction R. The angle θ formed by the intersecting direction X and the other direction Y (the acute angle of the angles formed by the two directions X and Y) is preferably 40 ° or more and 90 ° or less, more preferably 60 ° or more and 70 ° or less, In this embodiment, θ is 65 °.

  In the present embodiment, the regular pattern of the convex portion 4 is “a predetermined interval W2 in the intersecting direction Y where the convex portion 4 intersects both the rotational axis direction A and the circumferential direction R of the first roll 5. A plurality of convex rows 4Y are arranged at a predetermined interval W1 in a direction crossing the intersecting direction Y and in a direction X other than the rotation axis direction A and the circumferential direction R. It can also be said to be a “pattern”.

In this embodiment, the following configurations 1 and 2 are further adopted in addition to the regular pattern of the convex portions 4 (the convex portion group 4P).
Configuration 1: Of the plurality of convex portions 4 constituting the convex portion group 4P, the composite sheet 10A (covered material passing between both rolls 5 and 6 is located at the foremost portion in the rotation direction R1 of the first roll 5. The foremost convex part 4Q that first contacts the processed sheet) is a straight line 30 in which the front end 41 in the rotational direction R1 of the top part 40 is parallel to the rotational axis direction A of the first roll 5 (see FIG. 3). .
Configuration 2: The convex portion 4 other than the foremost convex portion 4Q in the convex portion group 4P has a corner portion 31 formed by two sides 42 and 43 where the front end 41 in the rotation direction R1 of the top portion 40 intersects each other. The two sides 42 and 43 intersect both the rotation axis direction A and the circumferential direction R (see FIG. 3).

  Regarding the configuration 1, in the present embodiment, as shown in FIG. 3, there are a plurality (three) of the foremost convex portions 4Q, and the front ends 41 of the top portions 40 of the plurality of foremost convex portions 4Q, respectively. Is a single virtual straight line (not shown) parallel to the rotation axis direction A in plan view. Each top portion 40 of each foremost convex portion 4Q has a trapezoidal shape (rectangular shape) with the front end 41 (straight line 30) as the hypotenuse in plan view.

  Regarding the configuration 2, in the present embodiment, the top 40 of the projection 4 other than the foremost projection 4Q has a parallelogram shape (rectangular shape) in plan view as shown in FIG. In the two sets of opposite sides 42 and 42 and sides 43 and 43, the sides are parallel to each other. One side 42 of the two sides 42 and 43 constituting the corner portion 31 is a straight line parallel to the intersecting direction X (convex portion row 4X), and the other one side 43 is another direction Y (convex portion row 4Y). Is a straight line parallel to

  Since the convex portion 4 of the first roll 5 that presses and cuts the elastic member 13 disposed between the sheets is configured and arranged in this manner, the cutting of the elastic member by the cutting means 3 is more reliably performed. Will come to be. That is, in particular, the composite sheet that passes between the first roll 5 and the second roll 6 by adopting the combination of the regular pattern of the convex part 4 (convex part group 4P) and the configuration 2 described above. A plurality of other convex portions 4 other than the foremost convex portion 4Q are in contact with 10A (sheet to be processed) in order from the one located on the front side (upper side in FIG. 3) of the rotation direction R1 of the roll 5, and In the plurality of convex portions 4 belonging to the same convex portion row 4X, the convex portions 4 contact one by one in order from the one located on the front side in the rotational direction R1, so that the plurality of convex portions are formed as described in Patent Document 1. The load (linear pressure) assigned to each convex portion is large compared to the case where the sheet to be processed is simultaneously contacted. Therefore, the elastic member 13 of the composite sheet 10A can be reliably cut. In addition, mainly by adopting the configuration 2, it is possible to reduce the change in load (linear pressure) assigned to each convex portion, and in particular, the convex portions 4 other than the frontmost convex portion 4Q. When the sides 42 and 43 constituting the top portion 40 intersect both the rotation axis direction A and the circumferential direction R, the cutting performance of the elastic member 13 of the composite sheet 10A by the convex portion 4 is improved.

  However, when the load assigned to each convex portion is increased in this way, in particular, the foremost convex portion 4Q that first contacts with the composite sheet 10A (sheet to be processed) is chipped or worn due to the excessive load. There is a risk of Therefore, in the present embodiment, the configuration 1 is further adopted in addition to the configuration 2, and the front end 41 of the top portion 40 of the foremost convex portion 4Q that is particularly likely to be chipped and worn is provided by the convex portion 4Q. A straight line 30 parallel to the rotation axis direction A of the first roll 5 provided is used, thereby reducing the load applied to the foremost convex part 4Q and suppressing the occurrence of chipping and wear of the foremost convex part 4Q. doing.

  In the present embodiment, as shown in FIG. 3, any two adjacent convex portions 4, 4 in an arbitrary one convex portion row 4 </ b> X are a part of each of the two convex portions 4, 4. Are arranged at the same position in the rotation axis direction A of the first roll 5. In other words, a virtual straight line (straight line extending in the vertical direction in FIG. 3) that vertically cuts the convex group 4P in the circumferential direction R (rotation direction R1) of the roll 5 is drawn, and the virtual straight line is drawn in the rotation axis direction of the roll 5. When moved along A, any two adjacent protrusions 4 and 4 in any one protrusion line 4X may overlap at the same time as the virtual straight line. That is, two adjacent convex portions 4, 4 belonging to the same convex portion row 4 </ b> X partially overlap in the circumferential direction R of the roll 5. With such a configuration, the elastic member 13 extending in the circumferential direction R of the composite sheet 10 </ b> A (processed sheet) can be more reliably pressed and cut by the convex portion 4, and the elastic member 13 is cut by the convex portion 4. The property is further improved.

  The arrangement of the convex portions 4 in such a convex row 4X also applies to the convex portion row 4Y extending in the direction intersecting with the convex portion row 4X. As shown in FIG. Arbitrary two convex portions 4, 4 adjacent in 4Y are arranged such that a part of each of the two convex portions 4, 4 is in the same position in the rotation axis direction A of the first roll 5. Yes.

  Moreover, in this embodiment, as shown in FIG. 3, any two adjacent convex part rows 4X and 4X are composed of a part of the plurality of convex parts 4 constituting the one convex part row 4X and the other. The plurality of convex portions 4 constituting the convex portion row 4 </ b> X are arranged at the same position in the rotation axis direction A of the first roll 5. In other words, a virtual straight line (straight line extending in the vertical direction in FIG. 3) that vertically cuts the convex group 4P in the circumferential direction R (rotation direction R1) of the roll 5 is drawn, and the virtual straight line is drawn in the rotation axis direction of the roll 5. When moving along A, in any two adjacent rows of convex portions 4X, 4X, the convex portion 4 of one convex portion row 4X and the convex portion 4 of the other convex portion row 4X It is designed to overlap at the same time as a straight line. That is, any two adjacent rows of convex portions 4 </ b> X and 4 </ b> X partially overlap in the circumferential direction R of the roll 5. With such a configuration, the elastic member 13 extending in the circumferential direction R of the composite sheet 10 </ b> A (processed sheet) can be more reliably pressed and cut by the convex portion 4, and the elastic member 13 is cut by the convex portion 4. The property is further improved.

  Note that the arrangement of the convex portions 4 in any two adjacent convex portion rows 4X and 4X also applies to the convex portion row 4Y extending in the direction intersecting with the convex portion row 4X, as shown in FIG. Arbitrary adjacent two rows of convex portions 4Y and 4Y are composed of a plurality of convex portions 4 constituting one convex portion row 4Y and a plurality of convex portions 4 constituting the other convex portion row 4Y. Are disposed at the same position in the rotation axis direction A of the first roll 5.

  Moreover, in this embodiment, the foremost convex part 4Q exists in the center part of the rotating shaft direction A of the surrounding surface of the 1st roll 5 (rotating body 52). Such a configuration is intended to minimize the influence of thermal expansion of the first roll 5. That is, as described above, heating means such as a heater is attached to the inside of the first roll 5, and when the heating means is operated to heat the roll 5, the roll 5 (rotating body 52) is There is a case where thermal expansion occurs in the form in which the central portion in the rotation axis direction A of the peripheral surface expands most, and in this case, the shape and arrangement of the convex portions 4 provided on the peripheral surface changes. From this point of view, in the present embodiment, the foremost convex portion is formed at the central portion in the rotation axis direction A of the peripheral surface of the roll 5 with the least influence of thermal expansion and the least likely deformation of the convex portion on the peripheral surface. 4Q is arranged. The central portion of the circumferential surface of the roll 5 in the rotational axis direction A, that is, the length along the rotational axis direction A of the region where the foremost convex portion 4Q is disposed is the total length of the circumferential surface of the roll 5 in the rotational axis direction A. Is preferably 10% or more, more preferably 20% or more, and preferably 50% or less, more preferably 30% or less, more specifically, preferably 10 to 50%, more preferably 20 to 20%. 30%.

  Moreover, in this embodiment, as shown in FIG. 3, it is located in the last part of the rotation direction R1 of the 1st roll 5 among the some convex parts 4 which comprise the convex part group 4P, and composite sheet 10A. The rear end 44 of the rearmost convex part 4 </ b> R that is in contact with the last part is a straight line 30 in which the rear end 44 in the rotational direction R <b> 1 of the top 40 is parallel to the rotational axis direction A of the first roll 5. The rearmost convex portion 4R has the same number (three) as the frontmost convex portion 4Q, and the straight line 30 that is the rear end 44 of the apex 40 of each of the rearmost convex portions 4R has a rotational axis in plan view. It exists on one virtual straight line (not shown) parallel to the direction A. The top portion 40 of each rearmost convex portion 4R has the same plan view shape as the frontmost convex portion 4Q, and has a trapezoidal shape (rectangular shape) with the rear end 44 (straight line 30) as a hypotenuse. Thus, by making the rear end 44 of the convex portion 40 of the rearmost convex portion 4R a straight line 30 parallel to the rotation axis direction A, the load applied to the rearmost convex portion 4R is reduced, and the rearmost convex portion 4R The effect of suppressing the occurrence of chipping and wear is exhibited.

From the viewpoint of more surely achieving the above-described effects (reduction of chipping / abrasion of protrusions, improvement of cutability of elastic member), the dimensions and the like of each part of the first roll 5 are as follows. It is preferable to set.
The area of the top portion 40 of the convex portion 4 (including the frontmost convex portion 4Q and the rearmost convex portion 4R. The same applies unless otherwise specified) is preferably 0.5 mm ² or more, more preferably 1 mm ² or more, and It is preferably 25 mm ² or less, more preferably 9 mm ² or less, more specifically preferably 0.5 mm ² or more and 25 mm ² or less, and more preferably 1 mm ² or more and 9 mm ² or less.
The protrusion height T (see FIG. 2) of the convex portion 4 is preferably 0.25 mm or more, more preferably 0.5 mm or more, and preferably 5 mm or less, more preferably 2.5 mm or less, more specifically. Preferably, they are 0.25 mm or more and 5 mm or less, More preferably, they are 0.5 mm or more and 2.5 mm or less.
The number of convex portions 4 existing in an arbitrary 1 cm square area is preferably 1 or more, more preferably 10 or more, and preferably 70 or less, more preferably 30 or less, more specifically. Is preferably 1 or more and 70 or less, more preferably 10 or more and 30 or less.

The interval W1 (see FIG. 3) between adjacent convex portions 4 and 4 in the convex row 4X is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less, and more specifically. Specifically, it is preferably 0.5 mm or more and 5 mm or less, more preferably 1 mm or more and 3 mm or less.
The interval W2 (see FIG. 3) between the adjacent convex portion rows 4X, 4X is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less, more specifically, Preferably they are 0.5 mm or more and 5 mm or less, More preferably, they are 1 mm or more and 3 mm or less.

  The elastic sheet 10 will be described. As the members constituting the elastic sheet 10, those normally used in this type of elastic sheet can be used without particular limitation. As the sheets 11 and 12, for example, paper, various nonwoven fabrics, a resin film, or a composite sheet obtained by appropriately combining these can be used. The sheet 11 and the sheet 12 may have the same composition or may be different. The material of the elastic member 13 is not particularly limited, and the form of the elastic member 13 can be appropriately selected from a thread shape, a belt shape, a ribbon shape, and the like. The width (diameter) of the elastic member 13 is preferably 0.1 mm or more and 5 mm or less.

  The stretchable sheet 10 can be used for various applications that make use of its stretchable properties, and can be used for absorbent articles having an absorbent body such as disposable diapers and sanitary napkins. When the elastic sheet 10 is used as a disposable diaper, it is suitable as a diaper exterior body, an elastic member disposed in the exterior body, or a gather member of a diaper, and when used as a sanitary napkin, a gather member It is suitable as. In addition to the absorbent article, the elastic sheet 10 is also suitable for a wearing article that does not include an absorbent body, for example, a medical wearing article such as a surgical gown and a general wearing article such as a jumper.

  As mentioned above, although this invention was demonstrated based on the embodiment, this invention is not restrict | limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, in the said embodiment, cutting | disconnection of the elastic member 13 of 10 A of composite sheets is attached to the 1st roll 5 with the pressurization with the convex part 4 of the 1st roll 5, and the surrounding surface of the 2nd roll 6. FIG. However, the latter may be omitted, and the elasticity is obtained only by the pressurization between the convex portion 4 of the first roll 5 and the peripheral surface of the second roll 6. It is also possible to cut the member 13. Moreover, in the said embodiment, although the two convex part groups 4P were formed in the 1st roll 5, the number of the convex part groups 4P may be one, and three or more may be sufficient as them. Moreover, in the said embodiment, although the convex part group 4P (convex part 4) was formed on the process part 43, the process part 43 does not need and it is directly formed on the surrounding surface of the rotary body 52. Also good.

  Moreover, the pattern of the convex part 4 in the 1st roll 5 may be a pattern as shown in FIG. The pattern of the convex part 4 shown in FIG. 4 is a pattern in which the foremost convex part 4Q exists in the central part in the rotation axis direction A of the convex part group 4P. The pattern of the convex part 4 shown in FIG. 4 exists in the center part of the rotation axis direction A of the peripheral surface of the 1st roll 5 (rotary body 52). It is effective to minimize the influence of the thermal expansion of the first roll 5 in the same manner as "". From the viewpoint of more surely exhibiting such an effect by the pattern of the convex portion 4 shown in FIG. 4, the foremost convex portion 4Q is separated from the virtual straight line CL that bisects the convex portion group 4P in the rotation axis direction A. In the rotation axis direction A, it is preferable to exist in an area within 25% of the total length of the convex portion group 4P in the rotation axis direction A.

  In addition to the embodiment of the present invention described above, the following additional notes (stretching sheet manufacturing apparatus and manufacturing method) are disclosed.

<1> A composite sheet in which a plurality of elastic members are arranged in an expanded state between sheets is used to produce an elastic sheet having a non-expandable portion by cutting the elastic member. An apparatus for producing a stretchable sheet comprising cutting means for performing
The cutting means includes a first roll having a plurality of protrusions projecting from a peripheral surface, and a second roll facing the first roll,
A convex group in which a plurality of the convex portions are arranged in a regular pattern is formed on a part of the circumferential direction of the peripheral surface of the first roll,
The regular pattern of the convex portions includes a plurality of convex portions arranged at predetermined intervals in the intersecting direction in which the convex portions intersect both the rotation axis direction and the circumferential direction of the first roll. , A pattern formed in a plurality of rows at predetermined intervals in a direction intersecting the intersecting direction and in a direction other than the rotation axis direction and the circumferential direction,
Among the plurality of convex portions constituting the convex portion group, the foremost convex portion located at the foremost portion in the rotational direction of the first roll and first contacting the composite sheet is the top convex portion. The front end of the rotation direction is a straight line parallel to the rotation axis direction of the first roll;
The other convex portions other than the frontmost convex portion in the convex portion group are corner portions constituted by two sides intersecting each other at the front end in the rotational direction of the apex portion, An apparatus for producing a stretchable sheet that intersects both the rotation axis direction and the circumferential direction.

<2> Of the plurality of convex portions constituting the convex portion group, the rearmost convex portion located at the rearmost portion in the rotation direction of the first roll and in contact with the composite sheet lastly is The apparatus for producing an elastic sheet according to <1>, wherein a rear end of the top portion in the rotation direction is a straight line parallel to the rotation axis direction of the first roll.
<3> The stretchable sheet manufacturing apparatus according to <2>, wherein a plurality of the rearmost convex portions exist.
<4> The stretchable sheet manufacturing apparatus according to <2> or <3>, wherein the rearmost convex portion is present in the same number as the frontmost convex portion.
<5> Arbitrary two convex portions adjacent to each other in the one row of convex portion rows have a part of each of the two convex portions in the same position in the rotation axis direction of the first roll. The manufacturing apparatus of the elastic sheet as described in any one of said <1>-<4> arrange | positioned.
<6> The stretchable sheet according to <5>, wherein any two of the adjacent convex portions adjacent to each other in the one row of the convex portion rows partially overlap in the circumferential direction of the first roll. manufacturing device.
<7> The stretchable sheet manufacturing apparatus according to any one of <1> to <6>, wherein a plurality of the foremost convex portions are present.
<8> The stretchable sheet according to any one of <1> to <7>, wherein the foremost convex portion exists in a central portion in a rotation axis direction of the peripheral surface of the first roll. manufacturing device.
<9> The length along the rotation axis direction of the area where the foremost convex portion is arranged on the circumferential surface of the first roll is relative to the total length of the circumferential surface of the first roll in the rotation axis direction. Preferably, it is 10% or more, more preferably 20% or more, and preferably 50% or less, more preferably 30% or less, more specifically, preferably 10-50%, more preferably 20-30%. The apparatus for producing an elastic sheet according to <8>, wherein

<10> Furthermore, it comprises a composite sheet manufacturing means arranged upstream of the cutting means in the sheet transport direction, the composite sheet manufacturing means comprising: a sheet transport means; an elastic member transport means; and a sheet or Any one of <1> to <9>, including an adhesive application unit that applies an adhesive to the elastic member, and a pair of upper and lower nip rolls to which the constituent members of the composite sheet are joined. The manufacturing apparatus of the elastic sheet of description.
<11> The stretch sheet manufacturing apparatus according to any one of <1> to <10>, wherein the peripheral surface of the second roll does not have an uneven shape and is smooth.
<12> The stretch sheet manufacturing apparatus according to any one of <1> to <11>, wherein a heating unit is attached to the first roll or the second roll.
<13> The heating temperature of the convex portion of the first roll or the second roll by the heating means is preferably 30 ° C. or higher and 200 ° C. or lower, more preferably 50 ° C. or higher and 120 ° C. or lower. The manufacturing apparatus of the elastic sheet as described in>.

<14> The first roll has a plurality of processed portions formed on the peripheral surface thereof so as to protrude at equal intervals in the circumferential direction, and the convex portion group is formed on the upper surface of each processed portion. The apparatus for producing an elastic sheet according to any one of <1> to <113>.
<15> When each of the plurality of convex portions constituting the convex portion group has a top portion that comes into contact with the composite sheet, and the convex portion is cut along the peripheral surface of the first roll. The cross-sectional area of the convex part of <1> to <14> has a trapezoidal shape that gradually increases from the top part toward the rotating shaft side of the first roll. Stretch sheet manufacturing equipment.
<16> The angle θ formed by the intersecting direction and the other direction is preferably 40 ° or more and 90 ° or less, more preferably 60 ° or more and 70 ° or less, and any one of <1> to <15>. The manufacturing apparatus of the elastic sheet of description.
<17> The regular pattern of the convex portions in the convex group includes a predetermined interval in the other direction Y where the convex portions intersect both the rotation axis direction and the circumferential direction of the first roll. A plurality of convex portions are arranged in a direction intersecting with the other direction and formed in a plurality of rows at predetermined intervals in the intersecting direction other than the rotation axis direction and the circumferential direction. The apparatus for producing an elastic sheet according to any one of <1> to <16>.
<18> A plurality of the foremost convex portions are present, and a straight line that is a front end in the rotational direction at the top of each of the plurality of the foremost convex portions is a rotation axis direction of the first roll in a plan view. The manufacturing apparatus of the elastic sheet as described in any one of said <1>-<17> which exists on one virtual straight line parallel to H.
<19> The elastic sheet manufacturing apparatus according to any one of <1> to <18>, wherein a top portion of the other convex portion has a parallelogram shape in plan view.
<20> The top part of the other convex part is a straight line in which one side of two sides constituting the corner part is parallel to the intersecting direction (convex part row extending in the intersecting direction), and the other one side is The apparatus for producing a stretchable sheet according to any one of <1> to <19>, which is a straight line parallel to the other direction (a row of convex portions extending in the other direction).
<21> The elastic sheet according to any one of <1> to <20>, wherein two arbitrary adjacent rows of convex portions are partially overlapped in a circumferential direction of the first roll. Manufacturing equipment.

<22> The top area of each of the plurality of convex portions constituting the convex portion group is preferably 0.5 mm ² or more, more preferably 1 mm ² or more, and preferably 25 mm ² or less, more preferably 9 mm. ² or less, more specifically, preferably 0.5 mm ² or more and 25 mm ² or less, and more preferably 1 mm ² or more and 9 mm ² or less. The stretchable sheet according to any one of the above <1> to <21> Manufacturing equipment.
<23> The protrusion height of each of the plurality of protrusions constituting the protrusion group is preferably 0.25 mm or more, more preferably 0.5 mm or more, and preferably 5 mm or less, more preferably 2. The elastic sheet according to any one of <1> to <22>, which is 5 mm or less, more specifically, preferably 0.25 mm or more and 5 mm or less, more preferably 0.5 mm or more and 2.5 mm or less. Manufacturing equipment.
<24> The number of the convex portions existing in an arbitrary 1 cm square region is preferably 1 or more, more preferably 10 or more, and preferably 70 or less, more preferably 30 or less, More specifically, the apparatus for producing a stretchable sheet according to any one of <1> to <23>, which is preferably 1 or more and 70 or less, and more preferably 10 or more and 30 or less.
<25> The interval between the convex portions adjacent to each other in the convex row is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less, more specifically preferably. Is 0.5 mm or more and 5 mm or less, More preferably, it is 1 mm or more and 3 mm or less, The manufacturing apparatus of the elastic sheet as described in any one of said <1>-<24>.
<26> The interval between the adjacent projections is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 3 mm or less, more specifically preferably 0.5 mm. The elastic sheet manufacturing apparatus according to any one of <1> to <25>, which is 5 mm or less and more preferably 1 mm or more and 3 mm or less.

<27> A composite sheet manufacturing process for manufacturing a composite sheet in which a plurality of elastic members are arranged in an expanded state between the sheets, and a non-stretchable portion formed on the composite sheet by cutting the elastic member of the composite sheet. A method for producing a stretchable sheet comprising a stretchable portion forming step,
The non-stretchable part forming step is performed using the manufacturing apparatus according to any one of <1> to <26>, and the first roll that rotates the composite sheet in the non-stretchable portion forming step. And the second roll, and stretchability to cut the elastic member of the composite sheet by pressurization between the convex portion constituting the convex portion group and the peripheral surface of the second roll Sheet manufacturing method.

DESCRIPTION OF SYMBOLS 1 Elastic sheet manufacturing apparatus 2 Composite sheet manufacturing means 3 Cutting means 4 Convex part 40 Convex part top part 41 Convex part top part rotation direction front end 44 Convex part top part rotation direction rear end 4P Convex part group 4Q Forefront Part convex part 4R Last part convex part 5 First roll 51 Rotating shaft 52 of the first roll Rotating body 6 constituting the first roll 6 Second roll 10 Elastic sheet 10A Composite sheet 11, 12 Sheet 13 Elastic member 14 Non-stretchable part A Roll rotation axis direction R Roll circumferential direction R1, R2 Roll rotation direction

Claims (7)

A cutting means for cutting an elastic member, which is used to manufacture a stretchable sheet having a non-stretchable part by cutting a composite sheet in which a plurality of elastic members are arranged in an extended state between the sheets. A stretch sheet manufacturing apparatus comprising:
The cutting means includes a first roll having a plurality of protrusions projecting from a peripheral surface, and a second roll facing the first roll,
A convex group in which a plurality of the convex portions are arranged in a regular pattern is formed on a part of the circumferential direction of the peripheral surface of the first roll,
The regular pattern of the convex portions includes a plurality of convex portions arranged at predetermined intervals in the intersecting direction in which the convex portions intersect both the rotation axis direction and the circumferential direction of the first roll. , A pattern formed in a plurality of rows at predetermined intervals in a direction intersecting the intersecting direction and in a direction other than the rotation axis direction and the circumferential direction,
Among the plurality of convex portions constituting the convex portion group, the foremost convex portion located at the foremost portion in the rotational direction of the first roll and first contacting the composite sheet is the top convex portion. The front end of the rotation direction is a straight line parallel to the rotation axis direction of the first roll;
The other convex portions other than the frontmost convex portion in the convex portion group are corner portions constituted by two sides intersecting each other at the front end in the rotational direction of the apex portion, An apparatus for producing a stretchable sheet that intersects both the rotation axis direction and the circumferential direction.   Among the plurality of convex portions constituting the convex portion group, the rearmost convex portion located at the rearmost portion in the rotation direction of the first roll and in contact with the composite sheet last is the top convex portion. The stretch sheet manufacturing apparatus according to claim 1, wherein a rear end of the rotation direction is a straight line parallel to a rotation axis direction of the first roll.   3. The stretchable sheet manufacturing apparatus according to claim 2, wherein there are a plurality of the rearmost convex portions.   Arbitrary two convex portions adjacent to each other in the row of convex portions are arranged such that a part of each of the two convex portions exists at the same position in the rotation axis direction of the first roll. The manufacturing apparatus of the elastic sheet as described in any one of Claims 1-3.   The stretchable sheet manufacturing apparatus according to any one of claims 1 to 4, wherein a plurality of the foremost convex portions are present.   The said foremost convex part exists in the center part of the rotating shaft direction of the surrounding surface of a said 1st roll, The manufacturing apparatus of the elastic sheet as described in any one of Claims 1-5. A composite sheet manufacturing process for manufacturing a composite sheet in which a plurality of elastic members are arranged in an expanded state between the sheets, and formation of a non-stretchable portion that cuts the elastic member of the composite sheet to form a non-stretchable portion in the composite sheet A process for producing an elastic sheet comprising steps,
The non-stretchable portion forming step is performed using the manufacturing apparatus according to any one of claims 1 to 6, and in the non-stretchable portion forming step, the composite sheet is rotated with the first roll and the first roll. The elastic sheet of the composite sheet is cut by pressing between the convex portions constituting the convex group and the peripheral surface of the second roll. Method.

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