JP2014104170A - Method of manufacturing disposable trunks-type diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a disposable trunks-type diaper that does not generate cut-off piece removed from a crotch portion.SOLUTION: A plurality of sheet pieces S to be a skirt part 50 are arranged so as to straddle continuous webs W transported in parallel and intermittently in a transport direction D1, a pair of continuous webs W are displaced so that a second edge part E2 of one of the pair of continuous webs W and a second edge part E2 of the other web come into contact with each other, and an absorbent body 40 is sequentially intermittently disposed between the adjacent sheet pieces S. A compound material W4 is folded in two in the transport direction D1 so that the pair of continuous webs W overlap each other, and between two adjacent absorbent bodies 40, the sheet piece S and the pair of continuous webs W are cut in a width direction D2 and sealed. The continuous webs W are sealed at a crotch portion 30, and a side edge part E3 close to the crotch portion 30 in each sheet piece S is sealed.

Description

  The present invention relates to a method for manufacturing disposable trunks-type diapers.

  Such a manufacturing method is disclosed in JP2008-253290A. In this prior art, the absorbent main body is arranged at a predetermined interval in the center in the width direction of the continuous web which becomes the front and rear waist portions, the continuous web is folded along the center line in the width direction together with the absorbent main body, and adjacent absorptions are made. The continuous web is cut and sealed between the sexual main bodies, and the crotch is excised and sealed to form the leg openings to form a trunks-type diaper having a hem.

JP2008-253290 A (FIGS. 4 to 8)

  However, in the said prior art, in order to cut | disconnect a crotch part, a trim generate | occur | produces and it becomes necessary to discard a cut piece.

  Accordingly, an object of the present invention is to provide a method for producing a disposable trunks-type diaper that does not produce a cut piece obtained by cutting off the crotch portion.

In the manufacturing method of the disposable trunks type diaper of the present invention,
The diaper is
A front waistline portion covering the front of the wearer's torso and extending in the waistline direction;
A rear waistline portion covering the back of the wearer's torso and extending in the waistline direction;
The crotch part which joins the front waistline part and the back waistline part, and covers a wearer's crotch in a longitudinal direction perpendicular to the waistline direction,
An absorptive main body disposed at least in a region including the crotch portion;
A pair of hems projecting downward from the front waistline part and the back waistline part along the wearer's leg on both sides of the crotch part;
The manufacturing method includes:
The second edge portions of the pair of continuous webs having a first edge portion disposed on the waist side of the wearer and a second edge portion disposed on the leg side and serving as the front and rear waist portions are parallel to each other. And a conveying step of conveying the pair of continuous webs in a state of being opposed to each other and spaced apart from each other;
An arrangement step of intermittently arranging the plurality of sheet pieces serving as the skirt portions between the continuous webs and in the conveying direction;
The sheet piece is folded in two along an imaginary line extending in the conveying direction, and the one second edge and the other second edge of the pair of continuous webs are in contact with each other, or A displacement step of displacing at least one of the pair of continuous webs in a width direction orthogonal to the transport direction so that the second edges overlap each other;
After the displacing step, the absorbent main body is intermittently disposed one after another on the first and / or second continuous web at a position between adjacent sheet pieces of the plurality of sheet pieces. A forming step to form a composite;
After the forming step, a folding step of folding the composite into two along the transport direction so that the pair of continuous webs overlap each other;
A first sealing step of cutting and sealing the sheet piece and the pair of continuous webs along the width direction between two absorbent bodies adjacent to each other among the plurality of absorbent bodies;
After the folding step, a continuous web is sealed at the crotch portion, and a second sealing step of sealing a side edge portion of each sheet piece close to the crotch portion is provided.

  According to the present invention, since the sheet pieces are intermittently disposed between the pair of continuous webs serving as the front and rear waist portions, a crotch portion that is recessed between adjacent sheet pieces can be formed, and the excision piece There is no risk of occurrence.

  In addition, a 1st sealing process and a 2nd sealing process may be performed simultaneously, and either one may be performed first and the other may be performed later.

1A to 1C are a schematic cross-sectional view taken along line IB-IB and a schematic cross-sectional view taken along IC-IC line, respectively, illustrating an example of a trunks-type diaper according to the present invention. 2A is a plan view showing Example 1 of the manufacturing method of the present invention, and FIG. 2B is an enlarged cross-sectional view taken along the line IIB-IIB. FIG. 3 is a plan view showing the latter half of the manufacturing method. 4A is a plan view showing Example 2 of the manufacturing method, and FIG. 4B is an enlarged cross-sectional view taken along the line IVB-IVB. FIG. 5 is a plan view showing the latter half of the manufacturing method. 6A is a plan view showing Embodiment 3 of the manufacturing method of the present invention, and FIG. 6B is an enlarged sectional view taken along the line VIB-VIB. FIG. 7 is a plan view showing the latter half of the manufacturing method.

Preferably, prior to the forming step, the method further comprises a step of folding the absorbent main body into two in advance at the site to be the crotch portion,
In the forming step, the absorbent main body folded in two is placed on one of the two continuous webs.

  In this case, the absorbent main body can be arranged so that the absorbent main body does not interfere with the seal in the second sealing step.

Preferably, the pair of skirts has leg elastic bodies extending in the circumferential direction of the legs,
A step of continuously arranging the continuous elastic member serving as the leg elastic body on the plurality of sheet pieces so as to straddle between the plurality of sheet pieces;
A step of cutting the continuous elastic member during the first and / or second sealing step.
In this case, the leg elastic body for fitting the skirt to the leg can be efficiently arranged.

Preferably, the lower ends of the pair of skirts have leg openings through which the wearer's legs pass,
The method further includes the step of forming the leg opening in the folded portion of the sheet piece.
In this case, the leg opening is formed after the sheet piece is folded, and the pair of continuous webs and the sheet piece before the sheet piece is folded are maintained in an integrated state. Therefore, conveyance is easy.

  The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

  Embodiments of the present invention will be described below with reference to the drawings. First, prior to the description of the manufacturing method of the present invention, an example of a trunk type diaper to which the present invention is applied will be described.

As shown in FIGS. 1A to 1C, the trunks type diaper 1 includes a front waistline portion 10, a rear waistline portion 20, a crotch portion 30, an absorbent main body 40, and a pair of skirt portions 50. Between the upper end of the front waistline part 10 and the upper end of the rear waistline part 20, a trunk opening O1 through which the wearer's trunk passes is formed. A leg opening O2 through which the wearer's leg passes is formed at the lower end of the pair of hem parts 50.
In FIG. 1A, the portion where the nonwoven fabric is welded and sealed is shown with fine dots.

  The front waistline portion 10 covers the front portion of the wearer's torso and extends in the waistline direction X. The rear waistline portion 20 covers the back of the wearer's torso and extends in the waistline direction X. The front waistline portion 10 and the back waistline portion 20 are formed of a web such as a nonwoven fabric, and are welded and sealed to each other at both ends S1 and S1 in the waistline direction X and a lower end portion S2 that is a part of the crotch portion 30. ing.

  The crotch part 30 covers the wearer's crotch in a row in the longitudinal direction Y orthogonal to the waistline direction X at the lower end S2 where the front waistline part 10 and the rear waistline part 20 are joined.

The absorptive main body 40 is disposed at least in a portion including the crotch portion 30. In this example, the absorbent main body 40 is disposed in a folded state from the crotch portion 30 in FIG. The absorbent main body 40 accommodates an absorbent core such as a known fluff pulp or super absorbent polymer between a liquid-permeable top sheet and a liquid-impermeable back sheet.

  The absorbent main body 40 is joined to the front waistline portion 10 and the rear waistline portion 20 with, for example, an adhesive at the front and rear upper end portions 41, and the lower end portion 42 of the absorbent main body 40 is located above the sealed lower end portion S2. It is in a state that floated. The absorbent main body 40 has a known three-dimensional cuff 43 for fitting the absorbent main body 40 to a wearer. The three-dimensional cuff 43 has a cuff elastic body 44 extending along the longitudinal direction Y. The absorbent main body 40 can be fitted to the wearer by the elastic body for cuff 44, and as described above, the state of floating upward from the lower end S2 is maintained in a state where the absorbent main body 40 is not worn.

    The pair of skirt portions 50 are formed of, for example, a non-woven fabric, and project downward from the front waistline portion 10 and the back waistline portion 20 along the wearer's legs on both sides of the crotch portion 30. The skirt 50 is welded and sealed at the outer portion S4 opposite to the inner portion S3 close to the crotch portion 30, and is formed in a cylindrical shape so that the legs can pass therethrough.

  A waist elastic body F <b> 1 and a waistline elastic body F <b> 2 may be disposed on the upper end portion 41 of the front waistline portion 10 and the rear waistline portion 20. Moreover, the leg elastic body F3 extended in the circumferential direction X1 of a leg may be arrange | positioned at the said skirt part 50, and the skirt part 50 may become easy to fit a wearer's leg.

  The front waistline portion 10 and the rear waistline portion 20 and the skirt portion 50 are formed of separate webs, and are joined to each other in the longitudinal direction Y by welding or bonding at a joint portion 51 in FIG. 1C.

  In the present invention, the elastic body or elastic member includes not only thread rubber and hot melt resin (thermoplastic resin) but also elastic tape, and is greatly elongated and has an original length or a length close to the original length. A member that can shrink.

Next, Example 1 of the manufacturing method of the present invention will be described.
A pair of continuous webs W shown in FIG. 2A, which are the waist portions 10 and 20 shown in FIG. 1A, have a first edge E1 arranged on the wearer's waist side and a second edge E2 arranged on the leg side. . The pair of continuous webs W are transported in the transport direction D1 along the longitudinal direction in a state where the second edge portions E2 of the pair of continuous webs W are parallel to each other, face each other, and are separated from each other. . The following processes are performed while performing this conveyance.

A continuous elastic member F that becomes the waist elastic body F1 (FIG. 1A) and the waistline elastic body F2 (FIG. 1A) may be arranged in advance on the web W. The web W may be a laminated web including two webs with a continuous elastic member F interposed therebetween.
In all the drawings, the elastic bodies and the elastic members are indicated by broken lines in order to make the drawings easy to see.

  During the conveyance, a plurality of sheet pieces (discontinuous webs) S that become the skirt 50 (FIG. 1A) are straddled between the second edge portions E2 of the continuous web W and intermittently in the conveyance direction. The sheet pieces S and the continuous web W are joined to each other at the edges. This joining is performed by welding or an adhesive.

After the arrangement, the continuous elastic member F to be the leg elastic body F3 (FIG. 1A) is continuously arranged and bonded on the plurality of sheet pieces S so as to straddle the plurality of sheet pieces S. . In this arrangement, in order to fix the continuous elastic member F, a sheet piece S made of another discontinuous web may be superimposed on the sheet piece S.

Thereafter, the pair of continuous webs W in the width direction D2 orthogonal to the transport direction D1 so that the one second edge E2 and the other second edge E2 of the pair of continuous webs W are in contact with each other. Displace at least one of them. That is, the conveyance paths of the two continuous webs W and W are brought close to each other. At this time, each sheet piece S is folded as shown in FIG. 2B by a sailor (not shown) along a virtual line L extending in the transport direction D1. In FIG. 2B, in order to illustrate the sheet piece S, the second edge portions E2 and E2 are illustrated slightly apart from each other. Further, the folded sheet piece S is in a state of being overlapped with one of the continuous webs W.

After the displacement step, the absorbent main body 40 is intermittently disposed between the adjacent sheet pieces S of the plurality of sheet pieces S to form a composite W4. In the case of the present embodiment, the absorbent main body 40 is disposed so as to straddle the pair of continuous webs W and W and the cuff elastic body F4 is extended.

Prior to the arrangement of the absorbent main body 40, an adhesive Se1 is preliminarily applied to the continuous webs W and W and / or the portion of the upper end portion 41 of FIG. 1 in the absorbent main body 40. After the arrangement, the continuous web W, The absorbent main body 40 is adhered to W.
In addition, the application part of the adhesive is shown with halftone dots larger than the seal part.

  After the formation of the composite W4, as shown in FIG. 3, the composite W4 is folded in two along the transport direction D1 so that the pair of continuous webs W overlap each other. At this time, the absorbent main body 40 is separated from the second edge E2 of the continuous web W by the contraction force of the cuff elastic body F4 of the three-dimensional cuff 43.

After the folding, the folded portion 59 of the sheet piece S is cut out. As a result, the leg opening O2 is formed in the sheet piece S to form the skirt 50.
Instead of the step of cutting off the folded portion 59, the folded portion 59 of the sheet piece S may be cut into two by a cutter while the continuous webs W are overlapped with each other.

  After the composite body W4 is folded in two, the sheet piece S and the pair of continuous webs W are arranged in the width direction D2 between two adjacent absorbent bodies 40 among the plurality of absorbent bodies 40. Cut along and seal. Thereby, the edge part S1 and the outer side part S4 of each diaper 1 are sealed. After this sealing step, simultaneously with the sealing step, or before the sealing step, the second edge portions E2 of the continuous web W are sealed together, that is, the lower end S2 in the crotch portion 30, and The side edge E3 (inner side S3) close to the crotch part 30 in each sheet piece S is sealed.

In the sealing process, the continuous elastic member F is cut simultaneously with the sealing.
Thus, individual diapers 1 are formed one after another.

In the present invention, the continuous elastic member F for the leg elastic body F3 may be cut immediately after the arrangement of the continuous elastic member F in FIG. 2A, or the leg elastic body F3 may be separated into two continuous pieces in advance. A continuous laminated body sandwiched between the webs W may be formed, and the continuous laminated body may be cut in advance to the length of the sheet piece S and installed on the continuous webs W and W in FIG. 2A.
Further, the leg elastic body F3 may not be provided.

Next, another embodiment will be described.
In the following examples, processes different from those of Example 1 will be mainly described, and description of the same or corresponding processes will be omitted.

4A to 5 show a second embodiment.
As shown in FIG. 4B, the present embodiment is characterized in that the continuous webs W, W are displaced so that the second edge portions E2 of the pair of continuous webs W, W overlap each other. In this case, when the continuous web W is displaced, the continuous web W is folded so that a part of the sheet piece S is sandwiched between the second edge portions E2 and E2 of the pair of continuous webs W and W.

6A to 7 show a third embodiment.
As shown in FIG. 6B, in the case of this example, prior to the formation of the composite W4, the absorptive main body 40 is folded in advance at the site to be the crotch portion 30, and the absorptivity folded into the two. The main body 40 is disposed on one continuous web W in FIG. 6A.

  In this embodiment, before the absorbent main body 40 is arranged, an adhesive Se1 is applied in advance to a part of the one continuous web W, and the absorbent main body 40 is fixed to one of the continuous webs W during the arrangement. The Further, after the arrangement, the adhesive Se2 is applied to the upper end portion 41 of the absorbent main body 40 so that the absorbent main body 40 is fixed to the other continuous web W when the composite W4 of FIG. 7 is folded. May be.

  In addition, the other process of the said Example 2 and 3 is the same as that of the said Example 1, attaches | subjects the same code | symbol to the same part or an equivalent part, and abbreviate | omits the description.

  The present invention can be used in a method for manufacturing disposable trunks-type diapers.

1: Diaper 10: Front waistline part 20: Rear waistline part 30: Crotch part 40: Absorbent body 41: Upper end part 42: Lower end part 43: Solid cuff 50: Hem part 59: Folding part D1: Conveying direction D2: Width direction E1: 1st edge E2: 2nd edge E3: Side edge F: Continuous elastic member F1: Elastic body for waist F2: Elastic body for waistline F3: Leg elastic body F4: Elastic body for cuff L: Line O1: Trunk opening O2: Leg opening S: Sheet piece S1: End S2: Lower end S3: Inner part S4: Outer part Se1, Se2: Adhesive W: Continuous web W4: Composite X: Circumference direction X1: Surrounding direction Y: Longitudinal direction

Claims (4)

A method for producing a disposable trunks-type diaper, wherein the diaper is:
A front waistline portion covering the front of the wearer's torso and extending in the waistline direction;
A rear waistline portion covering the back of the wearer's torso and extending in the waistline direction;
The crotch part which joins the front waistline part and the back waistline part, and covers a wearer's crotch in a longitudinal direction perpendicular to the waistline direction,
An absorptive main body disposed at least in a region including the crotch portion;
A pair of hems projecting downward from the front waistline part and the back waistline part along the wearer's leg on both sides of the crotch part;
The manufacturing method includes:
The second edge portions of the pair of continuous webs having a first edge portion disposed on the waist side of the wearer and a second edge portion disposed on the leg side and serving as the front and rear waist portions are parallel to each other. And a conveying step of conveying the pair of continuous webs in a state of being opposed to each other and spaced apart from each other;
An arrangement step of intermittently arranging the plurality of sheet pieces serving as the skirt portions between the continuous webs and in the conveying direction;
The sheet piece is folded in two along an imaginary line extending in the conveying direction, and the one second edge and the other second edge of the pair of continuous webs are in contact with each other, or A displacement step of displacing at least one of the pair of continuous webs in a width direction orthogonal to the transport direction so that the second edges overlap each other;
After the displacing step, the absorbent main body is intermittently disposed one after another on the first and / or second continuous web at a position between adjacent sheet pieces of the plurality of sheet pieces. A forming step to form a composite;
After the forming step, a folding step of folding the composite into two along the transport direction so that the pair of continuous webs overlap each other;
A first sealing step of cutting and sealing the sheet piece and the pair of continuous webs along the width direction between two absorbent bodies adjacent to each other among the plurality of absorbent bodies;
After the folding step, a continuous web is sealed at the crotch portion, and a second sealing step of sealing a side edge portion of each sheet piece close to the crotch portion is provided. In the manufacturing method of Claim 1,
Prior to the forming step, the method further comprises a step of folding the absorbent main body into two in advance at the site to be the crotch portion,
In the forming step, the absorbent main body folded in two is placed on one of the two continuous webs. In the manufacturing method of Claim 2,
The pair of hems have leg elastic bodies extending in the circumferential direction of the legs,
A step of continuously arranging the continuous elastic member serving as the leg elastic body on the plurality of sheet pieces so as to straddle between the plurality of sheet pieces;
A step of cutting the continuous elastic member during the first and / or second sealing step. In the manufacturing method of Claim 1, 2, or 3,
The lower ends of the pair of hems have leg openings through which the wearer's legs pass,
The method further includes the step of forming the leg opening in the folded portion of the sheet piece.

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