JP4994428B2 - Stretchable sheet manufacturing method and disposable wearing article using the same - Google Patents

Description

  The present invention relates to a method for manufacturing a stretchable sheet by attaching a stretchable member made of an elastic material such as rubber thread to a sheet such as a nonwoven fabric or a plastic film, and a disposable wearing article.

Disposable wearing articles such as disposable diapers and disposable pants are required to be able to expand and contract around the waist, around the legs, around the torso, etc., in order to improve the adhesion to the wearer. Although it is conceivable to use a woven fabric (stretch fabric) in which the material itself has a stretching force, it is expensive to use for a disposable wearing article. For this reason, usually, a thread-like or belt-like stretchable member is bonded to a nonwoven fabric or a plastic film in a stretched state so that these non-stretchable sheets can be stretched.
In order to continuously manufacture such a stretchable sheet, the stretchable member is unwound from the roll and applied with a predetermined tension to the nonstretchable sheet while the nonstretchable sheet is unrolled from the roll. The method is adopted. However, it may be necessary to intermittently provide a portion that does not need to be stretched and a stretchable portion in the traveling direction of the seat because of the form of the disposable wearing article or the convenience of cutting into individual products.
For parts that do not need to be expanded and contracted, it may be possible to apply the tension to the sheet without applying tension to the expansion / contraction member, but it is possible to quickly switch between the tensioned state and the state where no tension is applied. It is difficult.
Therefore, usually, the adhesive is intermittently applied to the sheet, the adhesive application portion and the non-application portion are alternately provided on the sheet along the sheet running direction, and the elastic member present in the adhesive non-application portion is cut. Thus, the non-stretchable part is provided. In the adhesive non-applied part, since the elastic member is not bonded to the sheet, the elastic member cut at one place is pulled toward the elastic member bonded to the sheet to relax and stay there. .
As a method of cutting the elastic member, the elastic member is provided between the first roll having a continuous linear convex portion (single blade) continuous along the roll width direction and the second roll facing the first roll. There is one that attempts to cut the elastic member by passing the arranged sheet and applying pressure or heating by the linear convex portion of the first roll.

  However, in this conventional method, since the cutting force is applied in a continuous line shape along the roll width direction, the sheet may be broken when the cutting force is applied to a portion where the elastic member does not exist. It was. In addition, even when the sheet does not reach breakage, a sheet of nonwoven fabric or the like is formed into a film by thermocompression bonding, so that one seal line with a hard tactile sensation remains across the portion where the elastic member does not exist. When this was done, there was a problem that both the appearance and the feeling of wearing were insufficient.

  Therefore, a main problem of the present invention is to enable cutting of the elastic member without fear of sheet breakage.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
On the outer periphery of the roll, an embossed portion that bulges outward in a predetermined circumferential length range is formed, and a first roll in which a group of convex portions is formed on the outer surface of the embossed portion, and a second roll Facing the roll,
A laminate in which a plurality of thread-like stretchable members are arranged in an expanded state on a sheet, or a laminate in which a plurality of thread-like stretchable members are sandwiched in a stretched state between a pair of sheets, the first roll and the second roll Each of the plurality of elastic members in the laminate is cut by at least one of pressurization and heating between the convex portion of the first roll and the second roll.
The manufacturing method of the elastic sheet characterized by the above-mentioned.

<Invention of Claim 2>
On the outer periphery of the first roll, an embossed portion that bulges outward in a predetermined peripheral length range is formed,
Furthermore, on the outer surface of the embossed part, a plurality of groups of convex parts spaced apart in the axial direction of the first roll are formed at intervals in the circumferential direction, so that a group of many convex parts is formed. And in any position in the axial direction, arranged so that any convex portion of the group of convex portions is located in the circumferential direction,
The first roll and the second roll are opposed to each other,
A laminate in which a plurality of thread-like stretchable members are arranged in an expanded state on a sheet, or a laminate in which a plurality of thread-like stretchable members are sandwiched in a stretched state between a pair of sheets, the first roll and the second roll Each of the plurality of elastic members in the laminate is cut by at least one of pressurization and heating between the convex portion of the first roll and the second roll.
The manufacturing method of the elastic sheet characterized by the above-mentioned.

<Action>
According to the first or second aspect of the invention, the elastic member can be reliably cut.

  According to the present invention, the elastic member can be cut without fear of sheet breakage.

It is a perspective view which shows the Example of this invention. It is a perspective view which shows the other Example of this invention. (A), (b) is front explanatory drawing which shows an embossing heat roll and an opposing roll. (A), (b) is explanatory drawing which shows the example of the embossing pattern of a staggered arrangement | sequence. It is explanatory drawing which shows the cutting state of an expansion-contraction member. It is explanatory drawing which shows the cutting | disconnection aspect of a rhombus convex part. It is explanatory drawing which shows the example of the grid | lattice embossing pattern of this invention. It is an explanatory longitudinal section showing a form included in the present invention. It is an expanded state top view of a reference form of a pants type disposable diaper. FIG. 10 is a view taken along line 2-2 in FIG. 9. FIG. 10 is a cross-sectional equivalent part of FIG. 9 in the product state. It is a surface side expansion state top view. It is a top view which shows the expansion | deployment state (front side) of another example. It is a flowchart of a diaper manufacturing line. It is a top view which shows the expansion | deployment state (front side) of the disposable diaper manufactured by the flow of FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings.
<Embodiment of stretch sheet manufacturing method>
(Mode of the present invention)
In FIG. 1, the perspective explanatory drawing of the example of the manufacturing method of the elastic sheet which concerns on this invention was shown. The arrow direction is the seat traveling direction.
A belt-like lower sheet 910 having a predetermined width is running from the right side to the left side of the figure with an adhesive application part 911 and a non-application part 912 provided by a hot melt adhesive application machine (not shown). In the present invention, as shown in FIG. 2, the adhesive 911 can be continuously applied in the longitudinal direction of the sheet. The hot melt adhesive is preferably applied by a spray coater, a curtain coater, a spiral coater or the like from the viewpoint of air permeability.

The plurality of elastic members 920 and 920 are drawn out from the elastic member roll, and are attached to the lower sheet 910 while being guided by the guide guide 921 in a state where a predetermined tension is applied by passing through the tension roll. . At this time, the elastic member 920 is sandwiched between the upper sheet 930 and the lower sheet 910 and passed between the press rolls 931 and 932 so that they are pressure-bonded, and in the adhesive application unit 911, the upper sheet 930, the lower sheet 910, and The elastic member 920 is firmly bonded.
Thereby, the laminated body 940 by which the expansion-contraction member 920 was inserted | pinched between the upper and lower sheets 930 and 910 is obtained.

The laminate 940 is inserted between an embossed heat roll (corresponding to the first roll) 950 and an opposing roll (corresponding to the second roll) 960 provided with the embossed portion 951, and only the elastic member is cut. X in FIGS. 1 and 2 indicates a cut portion. The length L ₂ of the embossed portion 951 is slightly shorter than the length L ₁ of the adhesive non-applied portion 912. Further, the coating interval, the circumferential length of the embossed heat roll 950, and the rotation speed are adjusted so that the embossed portion 951 contacts the adhesive non-applied portion 912.

  As shown in FIG. 3A, the facing roll 960 is preferably separated from the embossed heat roll 950 so as to contact only the embossed portion 951 of the embossed heat roll 950. When the embossed portion 951 is lowered by the rotation of both rolls, it comes into contact with the opposing roll 960. The embossed portion 951 is further formed with small convex portions 952 as illustrated in FIG. 1, and actually the tip surfaces of these convex portions 952 come into contact with the opposing roll 960. You may provide the recessed part which fits the embossed part 951 in the opposing roll 960 side.

Examples of emboss patterns are shown in FIGS. 4 (a) and 4 (b). FIG. 4A shows an emboss pattern in which a plurality of linear convex portions are arranged in a staggered manner. A row of convex portions arranged by arranging linear convex portions 953 and 953 having a length S ₁ and a width W ₁ in the axial direction (black arrow direction) of the embossed heat roll 950 with a distance D ₁ , and a convex portion 953 same length S _1, the protrusions 954,954 of the width W ₁ and, in the circumferential direction of the embossing heat roll 950 (open arrow), at a convex portion 953 and the distance M _1, and the convex portion 954 A row of convex portions arranged so that the center line in the length direction passes through a point of 2 / D ₁ and convex portions 955 and 955 having the same shape as the convex portions 953 are arranged in the same arrangement as the convex portions 953. And a row of convex portions. The number of convex portions in one row may be appropriately set depending on the number of elastic members to be cut. The number of rows of the convex portion group can be appropriately set according to the length L ₁ of the adhesive non-application portion.

FIG. 4B shows a pattern in which rhombic convex portions are arranged in a staggered manner. A row of convex portions arranged by arranging the rhombic convex portions 956, 956 of the long axis S ₂ and the short axis W ₂ in the axial direction (black arrow direction) of the embossed heat roll 950 with a distance D ₂ , and the convex portions The same rhombus-shaped convex portions 957 and 957 as 956 are arranged in the circumferential direction of the embossed heat roll 950 (in the direction of the white arrow), the convex portion 956 is separated from the distance M ₂ , and the short axis of the convex portion 957 is 2 / D It is formed from a row of convex portions arranged so as to correspond to _two points, and a row of convex portions formed by convex portions 958 and 958 having the same shape and the same arrangement as the convex portions 956. Of course, also in this pattern, the number of convex portions in one row is the number of elastic materials to be cut, etc., and the number of rows in the convex portion group is appropriately set according to the length L ₁ of the adhesive non-applied portion. Can do.

The length S ₁ of the linear protrusion and the long axis S _{2 of the} rhombus are preferably in the range of 1 to 25 mm, more preferably 5 to 25 mm. Further, it is preferable that the distances D ₁ and S ₁ between the adjacent convex portions are the same or S ₁ is longer. Because of the staggered arrangement, the elastic member positioned between the convex portions 953 and 953 can be reliably cut by the convex portions 954. Similarly, in D ₂ and S ₂ , it is preferable that D ₂ ≦ S ₂ . If S ₁ or S ₂ is shorter than 1 mm, the elastic member may not be cut in some cases, and if it is longer than 25 mm, the area of the seal portion becomes too large and the feeling of touch may deteriorate. Therefore, the range of D ₁ and D ₂ also range 1~25mm preferably, D ₁ is, 3 to 25 mm is more preferable. When the convex portion is a rhombus, when the corner portions of the convex portions adjacent to each other in the roll circumferential direction overlap slightly when viewed from the direction in which the elastic member is provided, the elastic member may escape from the sealing convex portion and cannot be cut. because, D ₂ is 3~10mm is more preferable.

The width W ₁ of the linear protrusion and the short axis W _{2 of the} rhombus are preferably 0.5 to 15 mm. If it is thinner than 0.5 mm, the elastic member may not be cut. If it is thicker than 15 mm, the area of the seal portion becomes too large, and the feeling of touch may deteriorate. For W ₂ , the lower limit is more preferably 1 mm or more.

The distance between the rows of the convex group is not particularly limited, but M ₁ or M ₂ is preferably ₅ to 25 mm. The shape of the convex portion is not limited to the above-mentioned linear shape and rhombus shape, but can be applied to diagonal lines, circular shapes, triangular shapes, star shapes, other polygonal shapes, and the like. It can be changed according to each row of convex portions.

FIG. 5 schematically shows a state where the elastic member is cut. In the figure, it is assumed that the vehicle is traveling downward. Reference numeral 911 denotes an adhesive application portion, and 912 denotes an adhesive non-application portion. The left elastic member 922 is cut by the nearest seal portion 970 (corresponding to the convex portion 953), and the end portion 922a is released from the tension state, and the elastic member 922 is bonded and fixed to the sheet. Shrink into. If the remaining elastic member is captured by the convex portion 955 before the cutting by the convex portion 953 is completed, the elastic member 922b between the convex portion 953 and the convex portion 955 is sealed when the convex portion 953 is cut. Shrink to the side. When cutting by the convex portion 953 is completed before the remaining elastic member is captured by the convex portion 955, the elastic member contracts toward the elastic member (not shown) existing in the downstream adhesive application portion. Will be. Further, the right expansion / contraction member 923 is also cut at the closest seal portion 971 (corresponding to the convex portion 954), and the end portion 923a contracts.
On the other hand, FIG. 6 shows a cutting mode in the case of the above-mentioned rhombic convex portion 956, and the same cutting and sealing as in the case of the linear convex portion are performed.

  With the above configuration, the stretchable member is cut, a large number of small seal portion groups are formed in the non-stretchable portion, and the upper and lower sheets are joined also in the adhesive application portion. Since each seal part is spaced apart and small one by one, even if it is formed into a film by heat sealing, it does not cause discomfort to the wearer compared to the case of a long continuous line.

(Other forms)
In place of the embossed heat rolls having the convex portions spaced apart from each other in the above embodiment, as shown in FIG. 7, a concave group having a length of 1 to 25 mm and a width of 0.5 to 15 mm is provided. Proposes an embossed heat roll 960 having a grid-like convex part of 0.5 to 5 mm. The grid-like convex part is formed by crossing a plurality of crosspieces 961, 961,... In a cross-beam shape, and a space 962 surrounded by the crosspieces (convex part) 961 is a lattice concave part. W ₃ is the width of the crosspiece and is preferably 0.5 to 5 mm. If it is too thick, the tactile sensation may be deteriorated. On the other hand, if it is thinner than 0.5 mm, it looks like a knife, and the upper and lower sheets may be all cut. The length of the grating recess is D _3, preferably from 5 to 25 mm, more preferably from 5 to 10 mm. The width of the grid recess is M _3, preferably from 5 to 25 mm, more preferably from 5 to 10 mm. Although an oblique lattice is shown in FIG. 7, it may of course be a square or rectangular lattice. In this form, since it is sealed in a lattice shape, the elastic member can be cut reliably. Further, since the portion corresponding to the lattice recess 962 is not sealed, the sheet will not break. Furthermore, since the thin grid-like convex part exists in a certain area part and is mesh-shaped, the expansion-contraction member should just be cut | disconnected by the convex part for a seal | sticker. When sealing with a single blade, all the elastic members must be cut with a single blade, so it is necessary to seal strongly so that there are no elastic members that are not cut, and the sheet will break. However, in the above configuration, since the elastic member only needs to be cut by the projecting portion for sealing, it is not necessary to seal strongly, and the sheet may be ruptured because it may be pressed on the surface. Absent. In addition, the lattice-like seal portion is soft to the wearer and has a beautiful appearance.

(Other forms)
(A) It is preferable that the embossed heat roll 950 and the opposing roll 960 shown in FIG. 1 are provided with a heating means at least one so as to melt the elastic member and seal the upper and lower sheets. A rod-like sheathed heater may be provided near these rolls, or another heating means such as a high-frequency heating means, a far-infrared heater, or an oil heater may be used in combination. However, in this invention, it is also possible to comprise so that an expansion-contraction member may be cut only by pressurization.
In FIG. 1, a configuration in which the positions of the embossed heat roll 950 and the opposing roll 960 are reversed can also be adopted.
(B) Either the lower sheet 910 or the upper sheet 930 is preferably heat-fusible. Nonwoven fabric, plastic film, knitted fabric, woven fabric, paper and the like can be used. As a raw material, a well-known raw material, such as a polypropylene, polyethylene, polyester, a cellulose, rayon, etc. can be used individually or in mixture of 2 or more types, respectively.
(C) Each sheet 910, 930 may be a multilayer sheet in which several sheets are already laminated. In this case, heat fusion is applied to the uppermost surface of the lower sheet 910 or the lowermost surface side of the upper sheet 930. It is necessary to provide a wearing sheet.
(D) As the elastic member of the present invention, a material that can be melted and cut (for example, thermoplastic polyurethane, various elastomers, rubbers, etc.), for example, a thread-like material can be used. An elastic member having a melting point lower than the melting point of the heat-fusible material of the upper and lower sheets is selected so as not to cut the sheet. In the above example, the elastic members are attached in parallel in a plurality of directions. However, in the present invention, only one elastic member can be attached.
(E) In FIG. 1, although the example which adhere | attaches an expansion-contraction member to the width direction center part of the sheet | seat was shown, of course, even if it is the structure which adhere | attaches an expansion-contraction member to the edge part vicinity of a sheet | seat. What is necessary is just to change the arrangement | positioning part of an emboss pattern according to the attachment position of an expansion-contraction member.
(F) The adhesive in the present invention can be applied to either one or both of the upper and lower sheets. Also, an adhesive can be applied to the elastic member. Furthermore, the adhesive may be applied to the sheet or the like discontinuously (see FIG. 1) or continuously (see FIG. 2) along the longitudinal direction, or entirely except a part, all or part of the sheet. it can.
(G) As shown in FIG. 8, the cutting site in the present invention may be an adhesive application part X or an adhesive non-application part Y.
(H) In the above example, the form in which the elastic member is sandwiched between the pair of upper and lower sheets is shown. However, as shown in FIGS. 8C and 8D, the elastic member is arranged and fixed on one sheet or a multilayer sheet. Even in this case, the elastic member cutting method of the present invention can be applied.

The effects of the embodiment of the present invention are summarized as follows.
That is, since an embossed heat seal having a grid-like convex portion is used, the elastic member is surely cut at the time of heat sealing by any of the convex portions.
Since the grid-like array base is formed with a thin grid-like seal portion in a certain area, the feel given to the wearer is soft, the appearance is beautiful, and sheet cutting is prevented.
Also, since the cutting force does not act on the elastic members other than the convex portions, there are portions where the elastic members in the roll axis direction are not cut and portions that are cut, and the pulling in by cutting the elastic members is partial. Thus, the sheet is less worn and has good wearability.

  Furthermore, when adopting a configuration in which a non-application part and an application part are intermittently provided during the application of a hot melt adhesive, an elastic sheet having alternating stretch parts and non-stretch parts can be continuously produced, preferable. In this case, there is also an advantage that the non-stretchable portion can be joined by a seal.

  When the stretchable sheet obtained by the present invention is used as a wearing article, the seal area is small, the seal parts are spaced apart in a zigzag form, or are formed in a lattice shape with spaces, so the appearance is beautiful, There is also an advantage that no discomfort such as pain is given to the wearer.

  Next, an example of application to a disposable wearing article will be described in detail by pulling an example of a pants-type disposable diaper. In the present invention, the right and left side edges on the abdominal side and the left and right side edges on the back side are used when using the diaper. The present invention can also be applied to so-called tape-type disposable diapers to be joined.

<Configuration example of disposable diapers>
FIG. 9 shows a pant mainly composed of a flexible outer sheet 1 and an absorbent main body 10 fixed to the inner surface of the outer sheet 1 and extending in the front-rear direction (vertical direction) with the crotch portion 4 as the center. The mold disposable diaper is shown.
The outer sheet 1 is formed by laminating and fixing two breathable / water-repellent nonwoven fabrics, and in the final stage of the manufacturing process after the outer sheet 1 and the absorbent main body 10 are overlapped, the front body F and the back body B The entire longitudinal direction of both side edges of the body is joined by means such as ultrasonic sealing or heat melting (this joint is indicated by reference numeral 30), thereby forming a waist opening and a pair of left and right leg openings. is there.

As shown in FIG. 10, the absorbent main body 10 includes a rectangular liquid-permeable top sheet 11 made of a nonwoven fabric or the like that directly touches the wearer's skin, and a rectangular absorbent core mainly composed of cotton-like pulp and having a certain degree of rigidity. 13 and an absorber AB composed of a rectangular crepe paper 14 wrapped around the upper and lower surfaces of the frame, and a polyethylene that wraps around the front side from the back surface of the absorber AB in a framed form. A rectangular liquid-impervious back sheet 12 made of a plastic film or the like is integrated by bonding with a hot melt adhesive (indicated by * in the figure is an adhesive portion). If necessary, a liquid-permeable second sheet 11S can be interposed between the liquid-permeable top sheet 11 and the crepe paper 14 as illustrated.
The absorbent main body 10 is integrated with the outer sheet 1 by adhering the outer sheet 1 to the outer sheet 1 with a hot-melt adhesive, leaving only a part of both sides of the liquid-impermeable back sheet 12.
Standing cuffs BA, BA for protruding around the use surface are formed on both sides of the absorbent main body 10, respectively. The standing cuffs BA are substantially standing-up seats 40 extending in the width direction, and elastic members. For example, it is composed of a single elastic rubber member or a plurality of elastic members 50, 50... As shown.

  More specifically, the standing cuff BA is formed by wrapping the standing sheet 40 in a doubled manner, and wrapping each of the elastic members 50, 50... With a hot melt adhesive or the like. The standing sheet 40 that forms each of the standing cuffs BA, BA is preferably not liquid-permeable but liquid-permeable or hydrophobic. Further, the liquid-permeable sheet may be repelled by silicon treatment or the like.

The inner surface of the double standing sheet 40 is fixed to the surface side of the liquid-impermeable backsheet 12 that wraps around the surface of the absorbent body AB with a hot melt adhesive or the like. As a result, the beginning of the inner surface of the double standing sheet 40 to the liquid-impermeable back sheet 12 forms the standing end of the standing cuff BA.
The inside from the standing end is a free part that is not fixed to the product body, and is functionally and conceptually a standing part B1 that faces the center side of the product, and a planar contact part B2 that turns back halfway and faces outward. Are classified.

On the other hand, at the front and rear end portions in the longitudinal direction, the standing portion equivalent portion (extension portion of the standing portion B1) B11 is directed to the article in the state toward the center side of the article, specifically, liquid-permeable, by hot melt adhesive or the like. It is fixed to the outer surface of the top sheet 11, and is fixed on the upright portion corresponding portion B11 in a state where the flat contact portion corresponding portion (extension portion of the flat contact portion B2) B22 is turned upside down.
Further, at least one of the stretchable members 50, 50... Is in the plane contact portion B2, but the stretchable member 50 is particularly preferably located at the tip of the plane contact portion B2. It is preferable to have the elastic member 50 also in B1. The optimum form is that it is in the vicinity of the standing end, in the vicinity of the turn-up, and at the tip of the flat contact portion B2. It is further desirable to have a plurality at the tip of the flat contact portion B2 as shown in the figure. The standing part B1 can be further provided with elastic members 50, 50... To increase the standing force. In the form shown in the figure, there are a total of seven in the standing portion B1 and three in the plane contact portion B2.

FIG. 9 shows the inside of the disposable diaper in a state in which the disposable diaper is expanded in the longitudinal direction. Therefore, the front and rear ends of the product are left as they are, and the standing cuff BA stands up around the leg by the contraction force of each of the elastic members 50, 50... As shown in FIG. At this time, the side portion of the absorbent main body 10 is deformed and lifted, and the absorbent core 13 is also slightly lifted while being deformed to form a deep pocket space.
In addition, in this lifted state, the contraction force of each of the elastic members 50, 50... Acts on the standing cuff BA itself, so that the standing part B1 stands almost vertically. Although the plane contact portion B2 also stands upright, the plane contact portion equivalent portion B22 is fixed on the upright portion equivalent portion B11 in a state where the plane contact portion B22 is turned upside down. The abutting portion B2 stands up while maintaining an upright state while maintaining an upright force. As a result, the flat contact portion B2 always fits planarly around the wearer's leg.

The space surrounded by the standing parts B1 and B1 forms a confined space for urine or soft stool. When urinating into this space, the urine passes through the liquid-permeable top sheet 11 and is absorbed into the absorbent body element AB, and the solid parts of loose stool are raised by the standing parts B1 and B1 of the standing cuff BA. And overcoming it is prevented. In the unlikely event that the urine leaks laterally over the standing distal edge of the standing part B1, the side leakage is prevented by the stop function by the flat contact part B2.
Furthermore, in this example, the lifting elastic member 60 along the longitudinal direction is fixed in an extended state at the center side from the standing end and at both side positions of the absorber AB.

In the illustrated embodiment, the lifting elastic member 60 is interposed between the liquid-impermeable back sheet 12 and the absorber AB. As shown in FIG. 10, the position in plan view does not overlap with the constricted portion of the absorbent core 13 in the leg periphery portion, but overlaps with the protruding portion of the absorbent core 13 in the longitudinal direction. It is in.
By providing such a lifting elastic member 60, when the product is mounted, as shown in FIG. 11, the both sides of the absorber AB by the contracting force of the lifting elastic member 60 (the action state is indicated by a white arrow). Deforms and stands up toward the wearer's skin. With respect to this standing portion, the standing cuff BA is added to the standing portions on both sides of the absorbent body AB via the standing end outside the lifting elastic member 60, so that the standing height with respect to the skin is increased. In other words, a deeper pocket space is formed, the fit with the skin is enhanced, and side leakage can be reliably prevented with only the standing cuff BA.

On the other hand, in the front body F and the back body B, a waistline opening is provided between the nonwoven fabrics of the outer sheet 1 and the folded back portions of the front and rear end portions of the back sheet of the outer sheet 1 in order to improve the fit around the body. The waist elastic members 20F, 20B,... Made of thin rubber thread are arranged and fixed under extension so as to expand and contract with an interval parallel to the edge of the portion. The interval and the number of the waist elastic members 20F, 20B... Can be determined as appropriate. For example, the interval is preferably about 4 to 6 mm, and the number is preferably about 5 to 7.
Further, lower abdominal elastic members 21F and 21F are provided at the waist corresponding to the lower abdomen of the front body F along the waist tightening direction (the direction parallel to the edge of the waist opening). A hip elastic member 21B is provided at the hip part of the back body B corresponding to the part along the waist fastening direction. These lower abdominal elastic members 21F and 21F and the buttocks elastic member 21B are provided by the elastic sheet of the present invention. In the figure, X represents a first roll 950 in which one or a plurality of the elastic members 920 are sandwiched in a stretched state to form a laminate and a plurality of convex portions are arranged on the surface, and the first roll 950 is opposed to the first roll 950. The laminate is passed between the second roll 960 and the elastic member 920 of this laminate is pressed and heated between the convex portion 952 of the first roll 950 and the second roll 960. The cutting part cut | disconnected by at least one is shown.
In the lower abdomen elastic members 21F and 21F in this example, the portion X corresponding to the central part of the absorber AB in the part from the one-side joint part 30 to the other-side joint part 30 in the front body F is the aforementioned book. It is formed discontinuously by cutting according to the inventive method. On the other hand, the buttocks elastic member 21B is continuously provided from the joint part 30 on one side to the joint part 30 on the other side in the back body B, as in the past. Moreover, the side edge on the opposite side to the discontinuous side of the lower abdominal elastic members 21F and 21F comes to be continuous with both ends of the buttocks elastic member 21B.
In the illustrated example, the lower abdomen elastic member 21F and the buttocks elastic member 21B are stretched so that an elastic member made of thin thread rubber expands and contracts, and both the front body F and the rear body B are 9-25 in parallel. It is arranged and fixed between the nonwoven fabrics of the book and the outer sheet 1. The mutual interval between the lower abdominal elastic member 21F and the hip elastic member is the same as or shorter than the interval between the waist elastic members 20F, 20B.

  Further, the thread rubber used as the lower abdomen elastic member 21F and the buttocks elastic member 21B has a smaller tensile stress or outer cross-sectional diameter than the thin rubber used as the waist elastic members 20F, 20B. Can be the same. Although it can respond simply by using the exact same rubber thread in both, differentiation may be achieved in addition to the above characteristics such as color coding. As the thin thread rubber used here, specifically, one having a tensile stress in the range of 4 to 17 g, particularly in the range of 5 to 10 g at 150% elongation, is preferably used, and the cross-sectional outer diameter is 100 to 100 g. The thing of the range of 350 micrometers, especially the range of 120-270 micrometers is used suitably.

  Thus, as can be seen from FIG. 12 showing the diaper surface side, a part of the absorber AB is discontinuously formed in the part from the joint part 30 on one side to the joint part 30 on the other side in the front body F. As a result, the lower abdomen elastic members 21F, 21F do not continue across the absorbent body AB in the front body F, and the contraction force in the direction of tightening the waist around the absorbent body AB is weakened. As a result, it is possible to prevent the problem that the absorbent body floats from the skin and leaks from the waist area due to the vertical hook formed along the waist fastening direction by the action of the elastic member that crosses the absorbent body AB as in the past. Is done. Moreover, in this example, since the collar expansion-contraction member 21B is continuously formed from the joining part 30 on one side to the joining part 30 on the other side in the back body B, as in the past, it prevents slipping off and adheres to the skin. Can be improved to the same extent as the conventional example. Moreover, since the lower abdomen elastic members 21F and 21F in the front body F are almost free from wrinkles at the discontinuous portions, the adhesion to the pants worn from above is also improved, and the appearance is neat and clean. Although not shown in the drawings, the lower abdomen elastic members 21F and 21F of the present invention cover all the parts of the absorber AB among the parts from the one side joint part 30 to the other side joint part 30 in the front body F. It can also be formed discontinuously. In this case, the same effect as described above can be obtained.

  On the other hand, FIG. 13 shows another embodiment of the disposable diaper, which is a rectangular main body outer sheet 1A that is slightly wider than the absorbent main body 10 and a front body waistsheet 1B that forms a front body portion excluding the crotch portion 4. And a back waistline sheet 1C that forms a back body part excluding the crotch part 4 is laminated and fixed.

  In the main body outer shape sheet 1A, a plurality of waist elastic members 70F and 70B are arranged and fixed under expansion at intervals between the both end edges constituting the waist opening in parallel with the end edges. A number of stretchable members 71F and 71F that are continuous along the product width direction are respectively attached to the portions corresponding to the side portions of the front waistline sheet 1B under extension, and the stretchable members 71F and 71F corresponding to the side portions are attached. Each other is considered to be discontinuous. On the other hand, in the back body waistline sheet 1C, the elastic member 71B is arranged and fixed so as to continuously extend from the joint portion on one side to the joint portion on the other side. And the part which continues with a waist elastic member among these elastic members constitutes a part of the waist elastic member of the present invention functionally and notionally.

  In the above example, the lower abdomen elastic member is formed discontinuously and the buttocks elastic member is formed continuously. Conversely, the lower abdominal elastic member is continuously formed from the one side joint to the other side joint. In addition, a part or all of the absorber is discontinuously formed in the part from the one side joint part to the other side joint part of the heel part elastic member, or the elastic member of the lower abdominal part and the buttock part as described later It is also possible to discontinuously form a part or all of the absorber in the part from the one-side joint part to the other-side joint part.

(Other examples)
In the above example, the stretchable sheet of the present invention was used to provide the lower abdomen stretchable member and the buttocks stretchable member. However, the stretchable sheet of the present invention can also be applied to other parts to which stretchability is desired (for example, waist It can also be used to provide a telescopic member, a leg-surrounding elastic member, and the like.

<Production form of disposable diapers>
Next, the example of the manufacturing method of a disposable diaper is shown and the usage method of the elastic sheet of this invention is demonstrated.
FIG. 14 shows an assembly flow of the pants-type disposable diaper, which includes an absorbent main body production / supply line 100, an outer shape sheet production / supply production line 200, and a final processing line 300.
In the absorbent main body production supply line 100, first, the absorbent core is supplied so that the longitudinal direction thereof is along the conveying direction, and a liquid-permeable top sheet is covered and fixed thereon, and further, the liquid-permeable top sheet is formed. Standing cuffs are arranged and fixed at both ends. Subsequently, these are arranged and fixed on a liquid-impervious backsheet supplied separately, and the absorbent main body 10 is completed. In the case of this example, the liquid-impervious backsheet is processed so that both side end portions are folded in advance and a reinforcing member such as a colored urethane film is sandwiched between them to strengthen the edge. (The side edge portion may be emphasized by color hot melt bonding without using a reinforcing member, or stiffness may be strengthened).
The absorbent main body 10 thus manufactured is turned 90 degrees in a plane so that its longitudinal direction is perpendicular to the conveying direction in the 90-degree turn device 110, and the outer sheet attachment device 310 of the final processing line 300 is turned. It is conveyed to.

On the other hand, in the outer sheet manufacturing supply production line 200, the lower abdomen elastic member, the buttocks elastic member, and the waist elastic member are attached to the belt-like outer sheet 201 continuous in the product width direction.
Specifically, the belt-shaped outer sheet 201 is first fed into the slip cutter device 210. In the slip cutter device 210, the separately supplied design sheet 202 is slipped and sequentially cut into a predetermined shape with a supply interval, and the cut design sheets 202 and 202 are placed on the upper surface of the belt-like outer shape sheet 201. The front body width direction center part and the back body width direction center part are respectively arranged and fixed by hot melt bonding or the like. As the design sheet, a film or the like made of a non-transparent material with a pattern or the like can be used.

Subsequently, the lower abdomen elastic sheet and the buttocks elastic sheet supplied from the waistline elastic member supply line 230 are attached to the outer sheet 201, respectively.
For this reason, in this example, in the waist elastic member supply line 230, the above-described manufacturing method of the present invention is used to form one or a plurality of elastic members 920 in a stretched state between the upper and lower sheets to form a laminate, and to protrude on the surface. The laminated body is passed between a first roll 950 in which a plurality of parts are arranged and a second roll 960 opposite to the first roll 950, and the elastic member 920 of the laminated body is attached to the first roll 950. The continuous elastic sheet 206 cut by at least one of pressurization and heating between the convex part 952 of the roll 950 and the second roll 960 and discontinuous in the part that is scheduled to overlap with the absorber is formed in the lower abdomen. One for each and one for the buttocks. In addition, for the production of the elastic sheet for the lower abdomen and the buttocks, individual lines may be provided, or one line produced may be divided into two in the longitudinal direction.
The continuous elastic sheet 206 for the lower abdomen and the buttocks manufactured in this way is continuously attached to a predetermined portion of the front body and the back body on the outer sheet 201 with a hot melt adhesive or the like.

  Next, the outer sheet 201 to which the continuous elastic sheet for the lower abdomen and the buttocks is pasted is sequentially fed to the die cutter device 320, where the portions corresponding to the leg opening 207 are cut out, and then the upper portion thereof. The continuous waist elastic member 203 is continuously supplied to a predetermined portion of each body (for example, a plurality of materials such as thread rubber and belt-like rubber are supplied in parallel at intervals) and fixed by hot melt bonding. The The elastic sheet of the present invention can be used as the waist elastic member.

The external sheet 201 to which the above-described member attachment is applied is subsequently sent to the external sheet attachment apparatus 310 of the final processing line 300. Here, the absorbent main body 10 that is separately fed to the portion corresponding to the center portion in the product width direction of the outer sheet 201 is disposed and fixed by hot melt bonding or the like.
The outer sheet 201 on which the attachment of various members and the like is completed is folded in two by the folding device 330 so that the both side edges 30, 30 of the front body F and the back body B are overlapped, and then the both side edges by the heat seal device 340 After 30 and 30 are heat-sealed, the surplus portion left for transportation in the final cutter 350 is cut off to form a portion corresponding to the edge of the waist opening, and the continuous product is between the side edges. Cut along substantial points and cut to fit the product dimensions into individual diapers. These individual diapers are sequentially fed to a counting device (not shown) after pictures and patterns are transferred onto the surface of the outer sheet 201 by the transfer roll 360 as necessary.

The disposable diaper thus manufactured is shown in FIG. 15 in the unfolded state (surface side), from the joint 30 on one side of the front body F to the other of the stretchable members 205, 205 of the lower abdomen stretchable sheets 206, 206. The portion 205X corresponding to the central portion in the width direction of the absorber among the portions up to the joint portion 30 on the side is the above-described method of the present invention, that is, the first roll 950 in which a plurality of convex portions are arranged on the surface, and the first roll 950. The laminate is passed between the second roll 960 and the opposite second roll 960, and the elastic member 920 of the laminate is added between the convex portion 952 of the first roll 950 and the second roll 960. It is cut by at least one of pressure and heating to be discontinuous. Moreover, the part corresponding to the width direction center part of an absorber among the parts from the junction part 30 of one side in the back body B to the junction part 30 of the other side in the elastic members 205, 205 of the buttocks elastic sheet 206, 206 205X also passes the laminate between the above-described method of the present invention, that is, between the first roll 950 having a plurality of convex portions arranged on the surface and the second roll 960 facing the first roll 950. The elastic member 920 of the laminate is cut by at least one of pressurization and heating between the convex portion 952 of the first roll 950 and the second roll 960 to be discontinuous.
In addition, the lower abdominal stretchable members 205 and 205 and the buttocks stretchable members 205 and 205 of the present invention can be made discontinuous by cutting only the stretchable members of the present invention at the portions corresponding to the entire width direction of the absorbent body.

  On the other hand, by omitting the cutting of the expansion / contraction member of the expansion / contraction sheet for the buttocks, only the buttocks expansion / contraction member from the one side edge of the back body to the other side edge is the same as shown in FIG. The disposable diaper can be arranged and fixed continuously.

  DESCRIPTION OF SYMBOLS 10 ... Absorption main body, 11 ... Liquid-permeable top sheet, 12 ... Liquid-impervious back sheet, 20F, 20B ... Elastic member, 21F ... Lower abdominal elastic member, 21B ... Hip elastic member, 930 ... Upper sheet, 931,932 ... press roll, 950 ... embossed heat roll (first roll), 951 ... embossed part, 952 ... convex part, 960 ... opposed roll (second roll).

Claims (2)

On the outer periphery of the roll, an embossed portion that bulges outward in a predetermined circumferential length range is formed, and a first roll in which a group of convex portions is formed on the outer surface of the embossed portion, and a second roll Facing the roll,
A laminate in which a plurality of thread-like stretchable members are arranged in an expanded state on a sheet, or a laminate in which a plurality of thread-like stretchable members are sandwiched in a stretched state between a pair of sheets, the first roll and the second roll Each of the plurality of elastic members in the laminate is cut by at least one of pressurization and heating between the convex portion of the first roll and the second roll.
The manufacturing method of the elastic sheet characterized by the above-mentioned. On the outer periphery of the first roll, an embossed portion that bulges outward in a predetermined peripheral length range is formed,
Furthermore, on the outer surface of the embossed part, a plurality of groups of convex parts spaced apart in the axial direction of the first roll are formed at intervals in the circumferential direction, so that a group of many convex parts is formed. And in any position in the axial direction, arranged so that any convex portion of the group of convex portions is located in the circumferential direction,
The first roll and the second roll are opposed to each other,
A laminate in which a plurality of thread-like stretchable members are arranged in an expanded state on a sheet, or a laminate in which a plurality of thread-like stretchable members are sandwiched in a stretched state between a pair of sheets, the first roll and the second roll Each of the plurality of elastic members in the laminate is cut by at least one of pressurization and heating between the convex portion of the first roll and the second roll.
The manufacturing method of the elastic sheet characterized by the above-mentioned.

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