CN108430775B

CN108430775B - Method for manufacturing composite sheet

Info

Publication number: CN108430775B
Application number: CN201680076698.2A
Authority: CN
Inventors: 桂川邦彦; 泷野俊介; 植田麻穗
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2015-12-28
Filing date: 2016-09-09
Publication date: 2020-06-19
Anticipated expiration: 2036-09-09
Also published as: WO2017115496A1; TWI701143B; JP2017119399A; CN108430775A; BR112018011718B1; JP6719208B2; BR112018011718A2; TW201726386A

Abstract

The invention provides a method for manufacturing a composite sheet, which can easily manufacture a composite sheet having a part with large stretching force and a part with small stretching force in a mechanical direction. The method for manufacturing the composite sheet (106) comprises the following steps: a step (a) in which a continuous elastic body (103) extending in the Machine Direction (MD) is fixed to a 1 st sheet (101) that is conveyed in the Machine Direction (MD); a step (b) in which a part of 1 continuous elastic body (103) fixed to the 1 st sheet (101) is cut at intervals in the Machine Direction (MD); and a step c of bonding the 1 st sheet (101) and the 2 nd sheet (102) to each other with the continuous elastic body (103) interposed between the 1 st sheet (101) and the 2 nd sheet (102).

Description

Method for manufacturing composite sheet

Technical Field

The present disclosure relates to a method of manufacturing a composite sheet.

Background

Conventionally, a method for producing a composite sheet having an elastic force is known. For example, patent document 1 discloses a method for manufacturing a composite sheet having a plurality of projecting portions arranged in order and having a stretching force.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-160919

Disclosure of Invention

Problems to be solved by the invention

In the case of the composite sheet of the invention disclosed in patent document 1, it is difficult to manufacture a composite sheet having a portion with a large stretching force and a portion with a small stretching force in the machine direction.

The present invention addresses the problem of providing a method for manufacturing a composite sheet that enables easy manufacturing of a composite sheet having a portion with a large stretching force and a portion with a small stretching force in the machine direction.

Means for solving the problems

The present invention is a method for manufacturing a composite sheet, including the steps of: a step a of fixing a continuous elastic body extending in a machine direction to a 1 st sheet conveyed in the machine direction; a step b of cutting a part of 1 of the continuous elastic bodies fixed to the 1 st sheet at intervals in the machine direction; and a step c of joining the 1 st sheet and the 2 nd sheet to each other with the continuous elastic body interposed therebetween.

In the step b, a dimension of a remaining portion of the continuous elastic body at the cut portion in a cross direction crossing the machine direction is made smaller than a dimension of the continuous elastic body without the cut portion in the cross direction. Thus, the dimension of the continuous elastic body in the cross direction at the cut portion becomes small, and thus a portion having a large elastic force and a portion having a small elastic force can be provided in 1 continuous elastic body. Therefore, the composite sheet having a portion with a large stretching force and a portion with a small stretching force in the machine direction can be easily manufactured.

In the step b, at least one of a portion of the 1 st sheet overlapping the continuous elastic body in the thickness direction and a portion of the 2 nd sheet overlapping the continuous elastic body in the thickness direction, and a part of the continuous elastic body are cut with a cutting tool having a length dimension in the intersecting direction smaller than a dimension of the continuous elastic body in the intersecting direction. Therefore, the composite sheet having a small area of the cut portion in the 1 st sheet and the 2 nd sheet can be provided.

In the step b, at least one of a part of the continuous elastic body, a part of the 1 st sheet overlapping the continuous elastic body in the thickness direction, and a part of the 2 nd sheet overlapping the continuous elastic body in the thickness direction, and at least one of a part of the 1 st sheet not overlapping the continuous elastic body in the thickness direction and a part of the 2 nd sheet not overlapping the continuous elastic body in the thickness direction is cut by a cutting tool having a length dimension in the intersecting direction larger than a dimension in the intersecting direction of the continuous elastic body. Therefore, the composite sheet having a large area of the cut portion in the 1 st sheet and the 2 nd sheet can be provided.

After applying an adhesive to the circumferential surface of the continuous elastic body, in the step c, the continuous elastic body is fixed to the 1 st sheet and the 2 nd sheet by the adhesive, and in the step b after the step c, a part of the continuous elastic body is cut by the cutting tool. This cuts the continuous elastic body fixed to the 1 st and 2 nd sheets, and therefore the accuracy of the cut portion of the continuous elastic body can be improved.

In the step b, a part of the continuous elastic body is cut by the cutting tool at a portion of the continuous elastic body inside of both side edges in the intersecting direction. Therefore, in the step of cutting the continuous elastic body, the cut end of the continuous elastic body is not generated, and therefore, the cut end does not enter the composite sheet, and the appearance of the composite sheet can be improved.

The cutting tool is fixed to the base so as to be inclined with respect to the machine direction. Therefore, the force applied to the base when the continuous elastic body is cut can be dispersed in the mechanical direction.

The method for manufacturing the composite sheet includes a step d of fixing and laminating a waterproof 3 rd sheet to at least one of the 1 st sheet and the 2 nd sheet after the step b. Therefore, the 1 st sheet and the 2 nd sheet have cut portions and are air-permeable, while the 3 rd sheet does not have cut portions, so that waterproofness can be maintained and a multifunctional composite sheet can be provided.

ADVANTAGEOUS EFFECTS OF INVENTION

In the method for producing the composite sheet according to 1 or more embodiments of the present invention, the elastic force is reduced at the cut portion, while the elastic force is larger than the elastic force at the cut portion at the non-cut portion, and therefore, it is possible to provide 1 continuous elastic body with a portion having a large elastic force and a portion having a small elastic force. Thus, according to the present invention, a composite sheet having a portion with a large elastic force and a portion with a small elastic force in the machine direction can be easily manufactured.

Drawings

The drawings show specific embodiments of the present invention disclosed herein, and include not only indispensable structures of the invention but also optional and preferred embodiments.

Fig. 1 is a schematic configuration diagram of a manufacturing apparatus for a composite sheet for carrying out the manufacturing method of the present invention.

Fig. 2 is a perspective view of an apparatus for manufacturing a composite sheet.

Fig. 3 is a plan view of the 1 st sheet after passing through the continuous elastic body fixing portion (step a).

Fig. 4 is an enlarged cross-sectional view of the continuous elastic body and the 1 st sheet in the cross direction at the cut portion.

Fig. 5 is a developed view of the peripheral surface of the cutting roll developed in the machine direction and the cross direction in order to show the arrangement of the cutters of the cutting roll.

Fig. 6 is a plan view of the 1 st sheet after passing through the cutting section (step b).

Fig. 7 is a plan view of the composite sheet after passing through the joint (step c).

Fig. 8 is a sectional view taken along line VIII-VIII of fig. 7.

Fig. 9 is a development view similar to fig. 5 showing modification 1 of the cutting roll.

Fig. 10 is a plan view of the composite sheet obtained by the manufacturing apparatus having the cutting roll shown in fig. 9.

Fig. 11 is a perspective view showing modification 2 of the cutting roller.

Fig. 12 is a plan view showing a composite sheet obtained by a manufacturing apparatus having a cutting roll according to modification 2 in which the arrangement of the cutter is changed.

Fig. 13 is a plan view showing a composite sheet obtained by a manufacturing apparatus having a cutting roll according to modification 3 in which the arrangement of the cutter is changed.

Fig. 14 is a plan view showing a composite sheet obtained by the manufacturing apparatus having the cutting roll according to modification 4 in which the arrangement of the cutter is changed.

Fig. 15 is a plan view showing a composite sheet obtained by a manufacturing apparatus having a cutting roll according to modification 5 in which the arrangement of the cutter is changed.

Fig. 16 is a plan view showing a composite sheet obtained by a manufacturing apparatus having a cutting roll according to modification 6 in which the arrangement of the cutter is changed.

Fig. 17 is an enlarged cross-sectional view of the continuous elastic body and the 1 st piece in the intersecting direction at the cutting portion of the manufacturing apparatus with a blade according to embodiment 2.

Fig. 18 is a schematic configuration diagram of the manufacturing apparatus according to embodiment 3.

Fig. 19 is a schematic configuration diagram of a manufacturing apparatus according to modification 1 of embodiment 3.

Fig. 20 is a front view showing a front waistline region and a back waistline region in which the composite sheet is used.

Fig. 21 is a partially enlarged view of the front waistline region and the rear waistline region.

Fig. 22 is a perspective view of a disposable wearing article (diaper) using the composite sheet of the present invention as viewed from the front.

Fig. 23 is a partially cut-away developed view of a diaper with elastic bodies stretched in the longitudinal and transverse directions of the diaper.

Detailed Description

The following embodiments relate to a method for manufacturing the composite sheet 106 shown in fig. 1 to 19 according to the present invention, and include not only the indispensable structure of the present invention but also optional and preferable structures.

< embodiment 1 >

Referring to fig. 1 and 2, the manufacturing apparatus 100 of the composite sheet 106 for carrying out the method of manufacturing the composite sheet 106 according to the present embodiment includes a machine direction (conveyance direction) MD in which the 1 st sheet 101 as a continuous sheet is conveyed, a cross direction CD orthogonal to the machine direction MD, and a thickness direction Z orthogonal to the machine direction MD and the cross direction CD, respectively. The manufacturing apparatus 100 is explained from the upstream side to the downstream side in the machine direction MD, and includes: a conveying unit 110 for conveying the 1 st sheet 101; a continuous elastic body fixing section (a step) 120 for supplying the continuous elastic body 103 having the peripheral surface coated with the adhesive to the 1 st sheet 101 and fixing the continuous elastic body 103 extending in the machine direction MD to the upper surface of the 1 st sheet 101; a cutting section (b step) 130 for cutting a part of the continuous elastic body 103 fixed to the 1 st sheet 101 at intervals in the machine direction MD to form a cut portion (through hole) 104 a; and a joining section (c step) 140 that supplies the 2 nd sheet 102 as a continuous sheet to the upper surface of the 1 st sheet 101, and joins the 1 st sheet 101 and the 2 nd sheet 102 to each other with the continuous elastic body 103 interposed between the 1 st sheet 101 and the 2 nd sheet 102.

The continuous sheet of the 1 st sheet 101 and the 2 nd sheet 102 has a thickness of, for example, 0.3 to 1.0mm and a grammage of 15g/m²～30g/m²Continuous in the machine direction MD. The continuous sheet may be, for example, an SMS (spunbond/meltblown/spunbond) fiber nonwoven fabric, a spunbond fiber nonwoven fabric, a through-air fiber nonwoven fabric, a plastic sheet, an apertured plastic sheet, a plastic sheet and an apertured plastic sheetLaminated sheets, and the like.

As the continuous elastic body 103, a linear, strand, or belt-shaped continuous elastic body can be used. The continuous elastic body 103 has a fineness of 450 to 1240dtex and is fixed to at least the 1 st sheet 101 in a state of being stretched 1.5 to 3.5 times from a contracted or relaxed state.

< transport section 110 >

The conveying unit 110 has a conveying roller 111 for conveying the 1 st sheet 101 in the machine direction MD. Although not shown, a plurality of conveying units 110 may be provided, or may be disposed after the joining unit 140. The conveying unit 110 may be configured by a pair of conveying rollers, and the 1 st sheet 101 may be conveyed in the machine direction MD by the rotational driving of one conveying roller of the pair of conveying rollers by passing the 1 st sheet 101 between the pair of conveying rollers.

< continuous elastic body fixing part 120 (step a) >)

The continuous elastic body fixing portion 120 is constituted by a pair of

rollers

121, 122 of a 1 st roller 121 positioned above in the thickness direction Z and a 2 nd roller 122 positioned below in the thickness direction Z, and the 1 st sheet 101 and the continuous elastic body 103 having an adhesive such as a hot melt adhesive applied to the entire circumferential surface thereof are supplied between the

rollers

121, 122, and the continuous elastic body 103 is pressed against the 1 st sheet 101 to fix the continuous elastic body 103 extending in the machine direction MD to the 1 st sheet 101.

Fig. 3 is a plan view of the 1 st sheet 101 after passing through the continuous elastic fixing portion 120. As shown in fig. 3, the dimension in the cross direction CD of the 1 st sheet 101 is L1, and 10 continuous elastic bodies 103 are fixed to the upper surface of the 1 st sheet 101. The plurality of continuous elastic bodies 103 are arranged at intervals from each other in the cross direction CD, for example, at equal intervals.

< cutting part 130 (step b) >

As shown in fig. 2, the cutting unit 130 includes a cutting roller 132 having a plurality of cutters (cutting tools) 131 on the circumferential surface. The cutters 131 are arranged on the circumferential surface of the roll so that 10 cutters are arranged in the cross direction CD, and a plurality of cutters are arranged at equal intervals in the circumferential direction, for example. The arrangement interval of the blades 131 in the cross direction CD of the cutting roller 132 is the same as the interval in the cross direction CD of the continuous elastic body 103.

The cutting section 130 and the joining section 140 include a pair of

rollers

133 and 134, which are a 3 rd roller 133 and a 4 th roller 134 positioned on the left side in fig. 2 in the machine direction MD, and an endless belt 135 stretched over the

rollers

133 and 134, and a pressing section 136 that presses the 1 st sheet 101 and the continuous elastic body 103. The 3 rd roller 133 is disposed below the cutting roller 132, and the 4 th roller 134 is disposed below the roller 141 of the joining portion 140.

Fig. 4 is an enlarged cross-sectional view in the cross direction CD of the continuous elastic body 103 and the 1 st sheet 101 at the cutting section 130, and fig. 5 is a developed view in which the peripheral surface of the cutting roller 132 is developed in the machine direction MD and the cross direction CD in order to show the arrangement of the cutters 131 of the cutting roller 132. The blades 131 are arranged at equal intervals, for example, in the circumferential direction R (the machine direction MD in fig. 5) and the cross direction CD of the cutting roll 132. Referring to fig. 4, a dimension L11 in the cross direction CD of each blade 131 is smaller than a dimension of the fineness in the cross direction CD of the continuous elastic body 103 (the dimension of the fineness in the cross direction CD of the continuous elastic body 103 is a diameter measured in a state where no force is applied to the continuous elastic body 103). Thus, when the cutter 131 partially cuts the 1 continuous elastic body 103, the central portion in the cross direction CD of the continuous elastic body 103 is cut by the cutter 131, and the cut portion 104a is formed at the central portion in the cross direction CD of the continuous elastic body 103 (the dimension in the cross direction CD of the continuous elastic body 103 is L12), and the portion where the cut portion 104a exists loses stretchability, while the residual portion 105 in the continuous elastic body 103 maintains stretchability.

When the continuous elastic body 103 is cut by the cutter 131, the dimension in the cross direction CD of the continuous elastic body 103 at the portion having the cut portion 104a is smaller than the dimension in the cross direction CD of the continuous elastic body 103 before the cut portion 104a is formed by forming the cut portion (the portion having the cut portion) 104a, and therefore, the stretching force (elastic force) of the portion where the cut portion 104a is formed is lower than that of the portion where the cut portion 104a is not formed. After the cut portion 104a is formed, as for the dimension in the cross direction CD of the residual portion 105 in the continuous elastic body 103 having the cut portion 104a, the dimension to the right of the cut portion 104a is L13, the dimension to the left of the cut portion 104a is L14 in fig. 4, and the total dimension in the cross direction CD of the residual portion 105 of the continuous elastic body 103 at the cut portion 104a is the sum of the dimension L13 and the dimension L14, which is smaller than the dimension in the cross direction CD of the continuous elastic body 103 without the cut portion 104a by an amount corresponding to the dimension L12 in the cross direction CD of the cut portion 104 a. In addition, in the cut portion 104a of the continuous elastic body 103, a part of the 1 st sheet 101 overlapping with the continuous elastic body 103 in the thickness direction Z is also cut, and a cut portion 104b is formed in the 1 st sheet 101.

Fig. 6 is a plan view of the 1 st sheet 101 after passing through the cutting section 130. Since the blades 131 of the cutting roller 132 are arranged at equal intervals in the circumferential direction, the cut portion 104a of the continuous elastic body 103 and the cut portion 104b of the 1 st sheet 101 are arranged at intervals in the machine direction MD. In addition, a part of the continuous elastic body 103 is cut by the cutter 131 at a portion inside the both side edges 103a in the cross direction CD of the continuous elastic body 103. Therefore, in the step of cutting the continuous elastic body 103, the cut end of the continuous elastic body 103 does not occur, and therefore, the cut end of the continuous elastic body 103 does not enter the composite sheet 106, and the appearance of the composite sheet 106 can be improved.

< bonding part 140 (step c) >)

As shown in fig. 1 and 2, the joining section 140 is composed of a roller 141 and a pressing section 136, and supplies the 2 nd sheet 102 and the 1 st sheet 101 to which the continuous elastic body 103 is fixed between the roller 141 and the endless belt 135 above the 4 th roller 134, presses the 2 nd sheet 102 against the upper surface of the 1 st sheet 101, and fixes the 2 nd sheet 102 above the 1 st sheet 101 and the continuous elastic body 103 with an adhesive applied to the peripheral surface of the continuous elastic body 103.

Fig. 7 is a plan view of the composite sheet 106 after passing through the joint 140, and fig. 8 is a sectional view taken along line VIII-VIII of fig. 7. In the composite sheet 106, the 1 st sheet 101 and the 2 nd sheet 102 are joined to each other with an adhesive applied to the peripheral surface of the continuous elastic body 103 in a state where the continuous elastic body 103 is interposed between the 1 st sheet 101 and the 2 nd sheet 102.

The stretching force of the continuous elastic body 103 becomes weak at the portion having the

cut portions

104a, 104b formed by the cutter 131, while the stretching force of the continuous elastic body 103 becomes stronger than the stretching force of the continuous elastic body 103 at the portion having the

cut portions

104a, 104b at the portion having the non-cut portions where the

cut portions

104a, 104b do not exist, so that 1 continuous elastic body 103 can have a portion having a strong stretching force and a portion having a weak stretching force. In the manufacturing apparatus 100 of this embodiment, since the continuous elastic body 103 continuously extends in the transverse direction X, it is not necessary to oscillate the continuous elastic body 103 in the cross direction CD and to decelerate the 1 st sheet 101 in the machine direction MD. Therefore, the 1 st and 2

nd sheets

101 and 102 and the continuous elastic body 103 can be conveyed at high speed in the machine direction MD.

< modification 1 >

Fig. 9 is a development view similar to fig. 5 showing a modification of the cutting roller 132. The cutter blades 131 are arranged on the cutting roll 132 so as to be inclined with respect to the machine direction MD and the cross direction CD, respectively. Therefore, the force applied to the cutter 131 when the continuous elastic body 103 is cut can be dispersed in the machine direction MD, and the force applied to the base portion 132a of the cutting roller 132 to which the cutter 131 is fixed can be dispersed, thereby suppressing the base portion 132a from being damaged.

Fig. 10 is a plan view of the composite sheet 106 obtained by using the manufacturing apparatus 100 having the cutting roll 132 on which the cutter 131 shown in fig. 9 is arranged. Since the respective blades 131 are arranged so as to be inclined with respect to the machine direction MD and the cross direction CD, the

cut portions

104a and 104b of the 1 st piece 101 and the continuous elastic body 103 formed by the blades 131 are inclined with respect to the machine direction MD and the cross direction CD, respectively. Further, if the contact area of the continuous elastic body 103 with the cutter 131 is increased, the force applied to the cutter 131 can be dispersed. For example, if the dimension of the blade 131 in the machine direction MD can be increased and the dimension of the blade 131 in the cross direction CD can be increased, the contact area of the continuous elastic body 103 with the blade 131 can be increased.

< modification 2 >

Fig. 11 is a perspective view of modification 2 of the cutting roller 132. As shown in fig. 11, in the cutting roller 132, a cutter-existing region 131a in which 5 cutters 131 are present is disposed on the near side in fig. 11, and a cutter-absent region 131b in which no cutter 131 is disposed on the far side in fig. 11 in the cross direction CD. When the composite sheet 106 is formed using the manufacturing apparatus 100 having the cutting roll 132, as shown in fig. 12, the composite sheet 106 having the 1 st stretch region 151 and the 2 nd stretch region 152 in the cross direction CD can be formed, the continuous elastic body 103 having the cutting portion 104a is disposed in the 1 st stretch region 151, the continuous elastic body 103 having no cutting portion 104a is disposed in the 2 nd stretch region 152, and the stretch force of the 2 nd stretch region 152 is larger than the stretch force of the 1 st stretch region 151.

< modification 3 >

Although not shown, in the cutting roll of modification 3, a cutter-existing region where the cutter 131 is present and a cutter-non-existing region where the cutter 131 is not disposed are alternately arranged in the circumferential direction. For example, in the circumferential direction of the cutting roller 132, a cutter-existing region may be disposed in a half-circumference portion, and a cutter-non-existing region may be disposed in the remaining half-circumference portion. When the composite sheet 106 is formed using the manufacturing apparatus 100 having such a cutting roll, the composite sheet 106 can be formed as shown in fig. 13, and in the composite sheet 106, a 1 st stretchable region 151 having a cut portion 104a is disposed on the right side in fig. 13 in the machine direction MD, and a 2 nd stretchable region 152 having a higher stretchable force than that of the 1 st stretchable region 151 without disposing the cut portion 104a is disposed on the left side in fig. 13.

< modification 4 >

Although not shown, the composite sheet 106 as shown in fig. 14 can be formed by using the manufacturing apparatus 100 having the cutting roll of modification 4 in which modification 2 and modification 3 are combined, as the arrangement of the cutter 131 of the cutting roll 132. In fig. 14, the lower 5 continuous elastic bodies 103 of the composite sheet 106 have a cut portion 104a only on the right side of fig. 14, and do not have a cut portion 104a on the left side. In fig. 14, the upper 5 continuous elastic bodies 103 are not present with one cut portion. Therefore, in the composite sheet 106, in fig. 14, the cut portion 104a is disposed at a lower right corner portion of the four corners, the 1 st expansion/contraction region 151 having a weak expansion/contraction force is disposed at the cut portion, and the 2 nd expansion/contraction region 152 having an expansion/contraction force larger than that of the 1 st expansion/contraction region 151 is disposed at the remaining 3 corner portions of the four corners.

< modification 5 >

Although not shown, the composite sheet 106 as shown in fig. 15 can be formed by using the manufacturing apparatus 100 having the cutting roll in which the cutters 131 are alternately arranged on the circumferential surface of the cutting roll 132. In this composite sheet 106, since the positions of the cut portions 104a of the continuous elastic bodies 103 adjacent to each other in the cross direction CD are shifted from each other, and the interval in the cross direction CD and the interval in the machine direction MD of the cut portions 104a are both increased, it is possible to prevent the stretching force of the continuous elastic bodies 103 from being locally increased.

< modification 6 >

In the above embodiment, the adhesive is applied to the entire circumferential surface of the continuous elastic body 103, and the continuous elastic body 103 is continuously fixed to the 1 st sheet 101 and the 2 nd sheet 102 in the machine direction MD. However, the present invention is not limited thereto. For example, the continuous elastic body 103 may have an application portion to which an adhesive is applied and a non-application portion to which an adhesive is not applied alternately in the machine direction MD, and as shown in fig. 16, the continuous elastic body 103 may have a fixing region 153 (left and right side portions in fig. 16) continuously fixed to the 1 st sheet 101 and the 2 nd sheet 102 at a portion having the cut portion 104a and a non-fixing region 154 (central portion in the lateral direction in fig. 13) not fixed to the 1 st sheet 101 and the 2 nd sheet 102 at a portion not having the cut portion 104 a. In the non-fixed region 154, when the entire region in the cross direction CD of the continuous elastic body 103 is cut, the non-fixed region 154 becomes a non-elastic region where the continuous elastic body 103 does not exist. Further, if the continuous elastic body 103 for forming the inelastic region and the continuous elastic body 103 for forming the cut portion 104a are cut by the cutter 131, the manufacturing apparatus 100 can be made compact.

< embodiment 2 >

Fig. 17 is a cross-sectional view similar to fig. 4 in the method for manufacturing the composite sheet 106 using the cutting roll 132 of embodiment 1. The cutter 131 of the cutting roller 132 has a dimension L15 in the cross direction CD of the cutter 131 longer than the dimension in the cross direction CD of the continuous elastic body 103.

When the continuous elastic body 103 and the 1 st sheet 101 are cut by using the cutting roller 132, a part of the continuous elastic body 103 and a part of the 1 st sheet 101 overlapping the cut continuous elastic body 103 in the thickness direction Z are cut, and a part of the 1 st sheet 101 not overlapping the continuous elastic body 103 in the thickness direction Z is also cut. In other words, the cut portion 104b of the 1 st sheet 101 has a portion 104c overlapping with the cut portion 104a of the continuous elastic body 103 in the thickness direction Z, and has a portion 104d not overlapping with the continuous elastic body 103 in the thickness direction Z.

The manufacturing apparatus 100 including the cutting roll 132 can provide the composite sheet 106 having the large area of the cut portion 104b in the 1 st sheet 101.

< embodiment 3 >

Fig. 18 is a schematic configuration diagram similar to fig. 1 in the manufacturing apparatus 100 according to embodiment 3. This manufacturing apparatus 100 supplies the continuous elastic body 103 having the adhesive applied on the peripheral surface thereof and the 2 nd sheet 102 to the upper surface of the 1 st sheet 101, and bonds the 1 st sheet 101 and the 2 nd sheet 102 to each other with the continuous elastic body 103 interposed between the 1 st sheet 101 and the 2 nd sheet 102. In other words, the step a and the step c are performed simultaneously while sharing the continuous elastic body fixing portion 120 and the joining portion 140 of the 2 nd sheet 102. Thereafter, the cutter 131 of the cutting roller 132 cuts a part of the 1 st sheet 101, a part of the 2 nd sheet 102, and a part of the continuous elastic body 103.

In the manufacturing apparatus 100, the continuous elastic body 103 fixed to the 1 st sheet 101 and the 2 nd sheet 102 is cut by the cutter 131 of the cutting roller 132, and therefore, the accuracy of the cut portion of the continuous elastic body 103 can be improved.

In the manufacturing apparatus 100, the pressing portion 136 is formed by extending the endless belt 135 between the 2 nd roller 122 and the 3 rd roller 133. In a state where the continuous elastic body 103 is interposed between the 1 st sheet 101 and the 2 nd sheet 102, the cutting rollers 132 form the cutting

portions

104a, 104b, and 104c in the 1 st sheet 101, the 2 nd sheet 102, and the continuous elastic body 103.

< modification 1 >

Fig. 19 is a schematic configuration diagram of modification 1 of the manufacturing apparatus 100 according to embodiment 3. In this manufacturing apparatus 100, after the cut portions are formed in the 1 st and 2

nd sheets

101 and 102 and the continuous elastic body 103, the 3 rd sheet 109 having a waterproof property without a cut portion and having an adhesive applied on the lower surface thereof is supplied to the upper surface of the 2 nd sheet 102, and the 3 rd sheet 109 is fixed to the upper surface of the 2 nd sheet 102.

With this manufacturing apparatus 100, the 1 st sheet 101 and the 2 nd sheet 102 have air permeability, while the 3 rd sheet 109 does not have a cut portion, so that it is possible to maintain waterproofness and to provide a multifunctional composite sheet 106.

In the above modification, the example of using the 3 rd sheet 109 having water-repellency is described, but the present invention is not limited thereto, and the 3 rd sheet having moisture permeability may be used.

In the composite sheet 106, the number of the continuous elastic bodies 103 is not limited to 10, and can be arbitrarily changed. In the plurality of continuous elastic bodies 103, the fineness and the elongation ratio of each continuous elastic body 103 may be the same or different from each other.

The continuous elastic body 103 of the composite sheet 106 of embodiments 1 to 3 is continuous in the machine direction MD except for the composite sheet 106 of modification 6 of embodiment 1, and the continuous elastic body 103 of the composite sheet 106 of modification 6 of embodiment 1 is continuous in the machine direction MD except for the non-fixed regions 154 that are cut.

Fig. 20 shows a composite sheet 106 cut to a predetermined length in the machine direction MD and manufactured by using the manufacturing apparatus 100 as described above. As shown in fig. 20, the composite sheet 106 has a longitudinal direction Y and a transverse direction X intersecting (orthogonal to) the longitudinal direction Y, and includes a 1 st sheet 101 having a cut portion 104B, a 2 nd sheet 102 having no cut portion, and a plurality of elastic bodies (obtained by cutting a continuous elastic body 103) 27A and 27B fixed to the 1 st sheet 101 and the 2 nd sheet 102. When this composite sheet 106 is used in a disposable wearing article (diaper 10), the 1 st sheet 101 is positioned on the skin-facing surface side and used as the inner sheet 21, the 2 nd sheet 102 is positioned on the non-skin-facing surface side and used as the outer sheet 23, and the 1 st sheet 101 and the 2 nd sheet 102 form the front waistline region 13 and the rear waistline region 14 (the rear waistline region 14 is shown as an example in fig. 20 and 21). Since the inner sheet 21 has the cut portions 104b, air permeability can be improved, and since the outer sheet 23 does not have cut portions, leakage of excrement can be prevented.

A disposable diaper 10 using this composite sheet 106 is shown in fig. 22 and 23. The diaper 10 has a longitudinal direction Y and a transverse direction X intersecting (orthogonal to) the longitudinal direction Y, and includes a skin-facing surface and a non-skin-facing surface opposed thereto, an annular elastic waist panel 11 extending in the waist circumferential direction, an absorbent chassis (liquid absorbent structure) 12 attached to the skin-facing surface side of the elastic waist panel 11, a front waist region 13, a rear waist region 14, and a crotch region 15 located between the front waist region 13 and the rear waist region 14.

The elastic waist panel 11 has an elastic belt function and includes a front waist panel 16 forming the front waist region 13 and a rear waist panel 17 forming the rear waist region 14. The front waist panel 16 and the back waist panel 17 have a rectangular shape defined by

inner end edges

16a, 17a,

outer end edges

16b, 17b, and both

side edges

16c, 17 c. The opposite side edges 16c of the front waist panel 16 and the opposite side edges 17c of the back waist panel 17 are overlapped with each other and joined at side seams 18 arranged at intervals in the longitudinal direction Y by a known method, for example, various thermal welding methods such as hot embossing and sonic waves, to form a waist opening 19 and a pair of leg openings 20. The front waist panel 16 and the back waist panel 17 respectively include an inner panel 21 positioned on the skin-facing surface side and an outer panel 23 positioned on the non-skin-facing surface side.

The absorbent chassis 12 comprises: a front end portion 12A attached to the skin-facing surface of the front waist panel 16 and a rear end portion 12B attached to the skin-facing surface of the rear waist panel 17; a liquid-absorbent core 43 extending in the longitudinal direction Y at least in the crotch region 15; a top sheet 44 formed of a hydrophilic fibrous nonwoven fabric and positioned on the skin-facing surface side of the liquid-absorbent core 43; a back sheet 45 formed of a hydrophobic or liquid-impermeable fibrous nonwoven fabric and positioned on the non-skin-facing surface side of the liquid-absorbent core 43; and a leakage-preventing sheet 46 which is arranged between the liquid-absorbent core 43 and the back sheet 45 and has a size covering at least the entire surface of the liquid-absorbent core 43 facing the back sheet 45. As the top sheet 44 and the back sheet 45, various known fiber nonwoven fabrics such as SMS fiber nonwoven fabric and spunbond nonwoven fabric can be used.

The liquid-absorbent core 43 is formed by mixing a desired amount of superabsorbent polymer particles and fluff pulp, and has a semi-rigidity higher than that of the sheet member constituting the diaper 10. The liquid-absorbent core 43 has a narrow sheet shape at the center in the longitudinal direction Y, and the entire liquid-diffusing sheet 47 such as tissue paper is covered therewith. The topsheet 44 and the backsheet 45 extend outward from the peripheral edge portions of the liquid absorbent core 43, and the extended portions are overlapped with each other and joined together by a hot melt adhesive (not shown), thereby forming side flaps 48 extending outward in the transverse direction X from both side edges 43C of the liquid absorbent core 43 and end flaps 49 extending outward in the longitudinal direction Y from both end edges of the liquid absorbent core.

In the plurality of waist elastics 27, in fig. 20, the fineness of the upper waist elastics 27A disposed above is larger than the fineness of the lower waist elastics 27B disposed below, and for example, since the extension ratio of the upper waist elastics 27A is the same as the extension ratio of the lower waist elastics 27B, the extension force (contraction force) of the upper extensible regions 28A in which the upper waist elastics 27A are disposed is larger than the extension force of the lower extensible regions 28B in which the lower waist elastics 27B are disposed.

The lower waist elastics 27B have a non-coated region where no adhesive is applied in the center portion in the transverse direction X, and are cut and shrunk in the center portion in the transverse direction in the non-coated region to form non-shrunk regions 36 where the lower waist elastics 27B are not present.

Fig. 21 is a partially enlarged view of fig. 20. The cut portions 104a are not formed on the inner side in the transverse direction X of the 10 lower waist elastics 27B, and the cut portions 104a are formed on the outer side in the transverse direction X of the 10 lower waist elastics 27B. The 1 st stretchable zone 29B is formed in a portion of the lower waist elastic body 27B where the cut portion 104a is formed, and the 2 nd stretchable zone 29C having a higher stretchable force than the 1 st stretchable zone 29B is formed in a portion of the lower waist elastic body 27B where the cut portion 104a is not formed.

By forming the front waistline region 13 and the rear waistline region 14 in this manner, the magnitude of the stretching force of each elastic region is: the upper telescopic region 28A > the 2 nd telescopic region 29C > the 1 st telescopic region 29B.

The materials constituting the production apparatus 100 of the present invention may be any of various known materials generally used in the field, unless otherwise specifically described. In addition, terms such as "1 st" to "3 rd" are used in the present specification only for distinguishing the same elements, positions, and the like.

Description of the reference numerals

101. The 1 st slice; 102. the 2 nd sheet; 103. a continuous elastomer; 103a, two side edges; 105. a residue portion; 106. a composite sheet; 109. the 3 rd slice; 110. a conveying section; 120. a continuous elastic body fixing part (a process); 130. a cutting part (step b); 131. a cutter; 132a, a base; 140. a joining part (step c); MD, machine direction; CD. The cross direction.

Claims

1. A method for manufacturing a composite sheet, wherein,

the method for manufacturing the composite sheet comprises the following steps:

a step a of fixing a continuous elastic body extending in a machine direction to a 1 st sheet conveyed in the machine direction;

a step b of cutting a part of 1 of the continuous elastic bodies fixed to the 1 st sheet at intervals in the machine direction; and

a step c of joining the 1 st sheet and the 2 nd sheet to each other with the continuous elastic body interposed therebetween,

in the step b, a dimension of a remaining portion of the continuous elastic body at the cut portion in a cross direction crossing the machine direction is made smaller than a dimension of the continuous elastic body without the cut portion in the cross direction.

2. A method for manufacturing a composite sheet, wherein,

the method for manufacturing the composite sheet comprises the following steps:

in the step b, at least one of a part of the continuous elastic body, a part of the 1 st sheet overlapping the continuous elastic body in a thickness direction, and a part of the 2 nd sheet overlapping the continuous elastic body in the thickness direction, and at least one of a part of the 1 st sheet not overlapping the continuous elastic body in the thickness direction and a part of the 2 nd sheet not overlapping the continuous elastic body in the thickness direction is cut by a cutting tool having a length dimension in a cross direction crossing the machine direction larger than a dimension in the cross direction of the continuous elastic body.

3. The method of manufacturing the composite sheet of claim 1,

in the step b, at least one of a portion of the 1 st sheet overlapping the continuous elastic body in the thickness direction and a portion of the 2 nd sheet overlapping the continuous elastic body in the thickness direction, and a part of the continuous elastic body are cut with a cutting tool having a length dimension in the intersecting direction smaller than a dimension of the continuous elastic body in the intersecting direction.

4. The method of manufacturing the composite sheet according to claim 2 or 3,

applying an adhesive to the peripheral surface of the continuous elastic body, and then fixing the continuous elastic body to the 1 st and 2 nd sheets with the adhesive in the step c,

in the step b after the step c, a part of the continuous elastic body is cut by the cutting tool.

5. The method of manufacturing the composite sheet according to claim 3,

in the step b, a part of the continuous elastic body is cut by the cutting tool at a portion of the continuous elastic body inside of both side edges in the intersecting direction.

6. The method of manufacturing the composite sheet of claim 2,

the cutting tool is fixed to the base so as to be inclined with respect to the machine direction.

7. The method of manufacturing the composite sheet according to claim 4,

in the step b after the step a and the step c, the cut portion is formed in the 1 st and 2 nd sheets,

the method for producing the composite sheet comprises a step d, wherein after the step b, a waterproof 3 rd sheet is fixed and laminated on at least one of the 1 st sheet and the 2 nd sheet in the step d.