JP2018102772A - Production method and production device of absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a compression groove on a laminate of a sheet member and an absorber.SOLUTION: There is provided a production method of an absorbent article 100 in which an absorber 30 and a sheet member 10 are laminated, comprising: an absorber transport step for transporting the absorber 30; a sheet transport step for transporting the sheet member 10 to the absorber 30; and a groove formation step for pressing a laminate of them from the sheet member 10 side by a groove formation part 240 in a state in which the absorber 30 and the sheet member 10 are overlapped, for forming one or plural compression grooves 40 on the laminate. Speed Vfor feeding the sheet member 10 to the groove formation part 240 in the sheet transport step is faster than speed Vfor feeding the absorber 30 to the groove formation part 240 in the absorber transport step.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and an apparatus for manufacturing an absorbent article that is mounted on a crotch of a wearer and absorbs and holds a liquid such as urine.

  2. Description of the Related Art Absorbent articles that are worn on the wearer's crotch are known for the purpose of absorbing and retaining excreted body fluid. Examples of absorbent articles include disposable diapers, urine pads, and sanitary napkins. Disposable diapers include, for example, pants-type ones where the left and right sides of the front body and back body are joined, and tape-type ones that are worn by attaching a fastening tape attached to the back body to the front body Are known. Such an absorbent article generally includes an absorber for absorbing and holding body fluid such as urine between a liquid-permeable top sheet and a liquid-impermeable back sheet.

  Moreover, conventionally, forming a pressing groove with respect to the laminated body of a top sheet and an absorber is known (patent documents 1 and patent documents 2). For example, in Patent Documents 1 and 2, after a top sheet is stacked on the skin-facing surface side of the absorbent body, the absorbent body and the top sheet are sandwiched and pressed by an embossing roller or the like, and a laminated body of the absorbent body and the top sheet. It is disclosed that a compressed groove is formed.

JP 2013-169437 A JP, 2006-007226, A

  When forming the pressing groove, an embossing roller having a protrusion corresponding to the pressing groove is disposed in the laminate of the top sheet and the absorber, and the flat surface or the recess corresponding to the protrusion is provided on the absorber side. There is a manufacturing method in which this laminate is sandwiched between an anvil roller or a conveyor.

When such a manufacturing method is used, in the step of conveying the absorbent body and the top sheet to the compressed groove forming step, these are conveyed in a substantially linear / substantially one-dimensional manner, while the compressed groove formed. In the process, directional elements other than the above directions are added, such as bending the top sheet in the groove direction or forming a groove in the absorber. As a result, the top sheet may be easily pulled and broken, or the adhesiveness between the absorber and the top sheet may be deteriorated. The top sheet cannot be placed along the groove formed in the absorbent body. For example, the top sheet may be easily peeled off from the groove. Therefore, the manufactured groove and absorbent article may not be able to exhibit the expected performance.
The above problem is the same when the compressed groove is formed in a composite in which a sheet other than the top sheet (appropriately referred to as “sheet member”) is placed on the absorbent main body.

  An object of this invention is to provide the manufacturing method and manufacturing apparatus of an absorbent article which can form a pressing groove in the laminated body of a sheet | seat member and an absorber.

  The manufacturing method of an absorbent article according to the present invention is a manufacturing method of an absorbent article in which an absorbent body and a sheet member are laminated, and an absorbent body transporting process for transporting the absorbent body, and transporting a sheet member onto the absorbent body In the state where the sheet conveying step to be performed and the absorbent body and the sheet member are overlapped, the groove forming portion presses the laminated body from the sheet member side to form one or a plurality of compressed grooves in the laminated body. The speed at which the sheet member is fed into the groove forming part in the sheet conveying process is higher than the speed at which the absorber is fed into the groove forming part in the absorber conveying process.

  An absorbent article manufacturing apparatus according to the present invention is an absorbent article manufacturing apparatus in which an absorbent body and a sheet member are laminated, and an absorbent body transporting section for transporting the absorbent body, and a sheet member on the absorbent body. In the state where the sheet conveying unit to convey, and the absorbent body and the sheet member are overlapped, the laminated body is pressed from the sheet member side to form one or a plurality of compressed grooves in the laminated body, and The speed at which the sheet conveying section feeds the sheet member into the groove forming section is faster than the speed at which the absorber conveying section feeds the absorber into the groove forming section.

  According to this invention, it becomes possible to form a pressing groove in the laminated body of a sheet | seat member and an absorber.

Drawing 1 is a mimetic diagram showing a part of process of a manufacturing method of an absorptive article concerning one embodiment of the present invention. FIG. 2 is a plan view showing a state after pressing grooves are formed in the laminate of the top sheet and the absorbent body. FIG. 3 is an exploded cross-sectional view taken along the line III-III shown in FIG. 2 and schematically shows the structure of the top sheet and the absorbent body in which the compressed grooves are formed. FIG. 4 is a plan view showing an absorbent body according to another embodiment. 5 is a cross-sectional view taken along the line V-V shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In the method for manufacturing an absorbent article according to the present embodiment, the absorbent article has a structure in which at least an absorbent body and a sheet member are laminated. The sheet member may be any sheet member that is stacked on the absorber, and includes, for example, a liquid-permeable top sheet and a liquid-impermeable back sheet. Specifically, the sheet member is preferably a liquid-permeable top sheet positioned on the skin-facing surface side of the absorber, but is not limited thereto, and the liquid positioned on the skin-non-facing surface side of the absorber. An impermeable back sheet or the like may be used. Another sheet member may be interposed between the absorber and the sheet member.

  The manufacturing method includes an absorber transporting process, a sheet transporting process, and a groove forming process. An absorber conveyance process is a process of conveying an absorber. A sheet conveyance process is a process of conveying a sheet member on an absorber (skin opposing surface side or skin non-opposing surface side). The direction in which these absorbers and sheet members are conveyed is referred to as “conveying direction”. The groove forming step is a step of forming one or a plurality of compressed grooves in the laminated body by pressing the laminated body from the sheet member side by the groove forming portion in a state where the absorbent body and the sheet member are overlapped. In the groove forming step, pressure is applied to the laminate as a reaction from the absorber side. The speed at which the sheet member is fed into the groove forming part in the sheet transporting process is faster than the speed at which the absorber is fed into the groove forming part in the absorber transporting process.

  As described above, when the sheet member and the laminated body of the absorbent body are pressed from the sheet member side by making the speed at which the sheet member is fed into the groove forming part faster than the speed at which the absorbent body is fed into the groove forming part. Further, it is possible to prevent the sheet member from being torn or easily broken by being pulled by the protrusion. Since the sheet member can be appropriately inserted into the groove portion of the absorbent body (along the groove shape formed in the absorbent body), the state in which the sheet member is adhered to the groove portion surface of the absorbent body is effectively maintained. It is also possible to make it.

The length of the absorbent body in the transport direction is L, the number of squeezing grooves in the transport direction is N, and the depth of the squeezing grooves is D. Let X be the transport length for transporting the sheet member toward the groove forming portion in the sheet transport step per unit time T required to transport one absorber in the absorber transport step. In this case, the transport length X is preferably within a range represented by the following formula.
[Formula] L <X ≦ L + N × 2D

  As described above, by setting the conveyance length X of the sheet member to a value that exceeds the length L of the absorbent body, it is possible to prevent the sheet from being pulled or torn at the time of squeezing or easily broken. can do. Moreover, it becomes easy to make a sheet | seat member follow the groove part of an absorber. The conveyance length X of the sheet member is L + N × 2D or less (the value obtained by multiplying the number N of compressed grooves by twice the depth D of the compressed grooves is equal to or less than the value obtained by adding to the length L of the absorbent body) By doing so, it is possible to prevent a portion where the sheet does not follow the surface of the absorber from occurring (dubbing). In other words, it is possible to prevent the appearance from becoming worse or the surface of the absorbent article from becoming worse, and leaking from the place where the absorbent body and the sheet are separated from each other, or both are easy to peel off. Can be prevented.

  It is preferable that the number N of compressed grooves is the number of compressed grooves in a portion having the largest number of compressed grooves as viewed in the conveying direction. That is, depending on the pattern of the squeezing groove, the number of intersections between the imaginary straight line extending in parallel with the conveyance direction and the squeezing groove may vary depending on the location. In that case, the number N of squeezing grooves is counted on the basis of a part having the largest number of intersections between the imaginary straight line extending in parallel with the conveying direction and the squeezing grooves. If the number N of the compressed grooves is counted based on the position where the number of the compressed grooves is small when viewed in the transport direction, the sheet member may be strongly pulled in another portion where the number of the compressed grooves N is large and may be easily broken. However, as described above, such a problem can be avoided by counting the number N of the compressed grooves based on the position where the number of the compressed grooves is the largest.

  Also, the conveyance length X of the sheet member (the length of conveyance of the sheet member toward the groove forming portion in the sheet conveyance step per unit time T required to convey one absorber in the absorber conveyance step) Preferably exceeds the length L of the absorbent body in the transport direction, and is not more than the surface length in the transport direction on the surface of the laminate on which the compressed grooves are formed by the groove forming portion. By adjusting the conveyance length X of the sheet member so as to satisfy the above conditions, the sheet member can easily enter the groove portion of the absorber, and the sheet member can be torn or easily broken by being pulled. In addition, the sheet member can be prevented from dubbing.

  The surface length is preferably the surface length at the site where the surface length of the laminate is the longest in the transport direction. Thus, by determining the conveyance length X of the sheet member on the basis of the portion having the longest surface length of the laminate, it is possible to avoid the problem that the sheet member is strongly pulled and easily broken.

  In the said embodiment, it is preferable that the sheet | seat member laminated | stacked on an absorber is a nonwoven fabric. Although the nonwoven fabric has a certain degree of extensibility, it is easy to break and has a certain restoring force. For this reason, the said manufacturing method can be utilized suitably in the form which laminates | stacks the sheet | seat member which consists of a nonwoven fabric on an absorber, and forms a pressing groove in these laminated bodies.

  In the above embodiment, the elongation stress (also referred to as 5% elongation stress) at the time of 5% elongation in the conveyance direction of the sheet member may be 10 N or more. It can be said that a sheet member (particularly a nonwoven fabric) having a 5% elongation stress of 10 N or more is generally difficult to stretch.

  If an attempt is made to form a compressed groove by stacking a sheet member that is difficult to stretch on the absorbent body, as described above, the sheet member may not enter the groove portion of the absorbent body, and the sheet portion may be partially broken or easily broken. There is a high possibility of becoming. According to the said manufacturing method, even if it is such a sheet member which is hard to stretch, it is possible to stick appropriately along the groove part surface of an absorber. Therefore, it can be said that the range of selection of materials used for the sheet member is widened. In addition, when a material that does not easily stretch is used for the sheet member, it is possible to form a beautiful compressed groove while preventing the sheet member from being torn. Furthermore, the stretch rate of the nonwoven fabric in the portion provided with the compressed groove (especially the portion corresponding to the inside of the groove, especially when the groove has a corner) and the other portion (non-compressed region) is approximately Can be equal.

  It is preferable that an absorber conveyance process is a process of conveying an absorber with a suction conveyor. The suction conveyor is a conveyor that can transport the absorbent body in the transport direction while sucking the absorber in the vertical direction. Thus, the absorber can be conveyed at a stable speed by using the suction conveyor. Moreover, it is also possible to sandwich the laminated body of an absorber and a sheet member by this suction conveyor and an embossing roller, and to form a pressing groove in this laminated body, conveying an absorber with a suction conveyor.

  It is preferable to apply a hot melt adhesive to at least one of the absorber and the sheet member, and to heat a region where the compressed groove is formed in the laminate when the laminate is pressed in the groove forming step. Thus, the bonding force of the sheet member and the absorbent body at the site where the compressed groove is formed can be increased by pressing the laminated body to form the compressed groove. In the case where the sheet member is formed of, for example, a nonwoven fabric, the sheet member is likely to enter the groove portion of the absorbent body because the elongation force is increased by partially heating the sheet member.

  The absorbent article manufacturing apparatus in which the absorbent body and the sheet member in the present embodiment are laminated can be basically used in the above-described method for manufacturing an absorbent article. That is, this manufacturing apparatus includes an absorbent body transport unit, a sheet transport unit, and a groove forming unit. An absorber conveyance part conveys an absorber. The sheet conveying unit conveys the sheet member onto the absorber. The groove forming portion presses the laminated body from the sheet member side in a state where the absorbent body and the sheet member overlap with each other to form one or a plurality of compressed grooves in the laminated body. The speed at which the sheet conveying unit feeds the sheet member into the groove forming unit is set to be faster than the speed at which the absorber conveying unit sends the absorber into the groove forming unit.

In the present specification, the “conveying direction” is a direction in which the absorbent body and the sheet member laminated thereon are conveyed, and corresponds to the machine direction of the absorbent article manufacturing apparatus. The “orthogonal direction” is a direction orthogonal to the transport direction in a plane. The “vertical direction” is a direction that extends perpendicularly to the plane formed by the transport direction and the orthogonal direction. In the drawings of the present application, the conveying direction is indicated by a symbol MD, the orthogonal direction is indicated by a symbol CD, and the vertical direction is indicated by a symbol TD. In addition, the conveyance direction, the orthogonal direction, and the vertical direction in the manufacturing method and manufacturing apparatus of the absorbent article respectively correspond to the longitudinal direction, the width direction, and the thickness direction of the absorbent article manufactured by these methods and apparatuses. To do.
In the present specification, the “skin facing surface” means a surface facing the wearer's skin when the absorbent article is worn. Further, the “non-skin facing surface” means a surface that does not face the wearer's skin when the absorbent article is worn, that is, a surface opposite to the skin facing surface.
In the present specification, “A to B” means “A or more and B or less”.

  FIG. 1 shows a part of the steps of a method for manufacturing an absorbent article according to an embodiment together with an example of an absorbent article manufacturing apparatus 200. In FIG. 1, the absorber 30 is shape | molded, the top sheet 10 is joined to the skin opposing surface of the absorber 30, the embossing is given with respect to the laminated body of the absorber 30 and the top sheet 10, and those laminated bodies are used after that. The process of joining the back sheet 20 to the skin non-facing surface is shown.

  As shown in FIG. 1, in this manufacturing method, first, individual absorbent bodies 30 are molded in the absorbent body molding section 210 (absorber molding step). The absorber 30 is a member for absorbing body fluid such as urine and holding the absorbed body fluid. The absorber 30 is made of an absorbent material. For example, the absorbent material is mostly composed of hydrophilic fluff pulp formed by pulverizing fiber materials such as conifers and hardwoods, and a granular absorbent polymer (SAP) is contained in the fluff pulp. What was mixed can be used. Fluff pulp is an aggregate of fibers formed by entanglement of ultrafine fiber materials, and is embedded and held in the absorbent polymer by mixing with the fiber material. As fluff pulp, for example, pulp fibers such as conifers or hardwoods, rayon fibers, short fibers of cellulose fibers such as cotton fibers, and other synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate are hydrophilized. The short fiber etc. which gave can be used. These fibers may be used individually by 1 type, and may be used in combination of 2 or more type.

  The absorber molding unit 210 includes a chamber 211 and a molding drum 212. The chamber 211 supplies the absorbent material constituting the absorber 30 to the forming drum 212. The molding drum 212 is provided with a plurality of recesses 213 in the shape of the shape of the absorber 30 to be obtained, and the recesses 213 have air holes 214 communicating with an external suction device and an intake device. Is formed. The absorbent material supplied from the chamber 211 is supplied to the recess 213 provided on the peripheral surface of the molding drum 212 and is molded into the shape of the absorber 30. The absorbent material filled in the recess 213 is held on the peripheral surface of the molding drum 212 for a certain period by being sucked by the external suction device through the air hole 214. Below the forming drum 212, a first absorber transport unit 220 for transporting the absorber 30 is provided. The forming drum 212 rotates in accordance with the transport direction and transport speed of the first absorber transport unit 220. When the absorbent material held on the peripheral surface of the molding drum 212 has reached a position where it faces the conveyance surface of the first absorber conveyance unit 220, the pressurized air supplied from the external intake device is formed by the molding drum 212. The absorbent body 30 ejected through the air holes 214 and made of an absorbent material is placed on the transport surface of the first absorbent body transport section 220.

  The 1st absorber conveyance part 220 conveys the absorber 30 shape | molded by the absorber shaping | molding part 210 to an apparatus downstream side (absorber conveyance process). The 1st absorber conveyance part 220 is comprised by the suction conveyor 221. As shown in FIG. The suction conveyor 221 includes a driving roller 222, a driven roller 223, and an endless perforated belt 224 spanned between these rollers. On the conveying surface of the perforated belt 224, an absorber molding unit The absorber 30 supplied from 210 is placed at a constant pitch. A suction box 225 for sucking air is provided below the transport surface of the perforated belt 224, and the absorber 30 on the transport surface is absorbed by the suction box 225 through a plurality of holes provided in the perforated belt 224. Sucked. Thereby, the absorber 30 is prevented from falling off from the transport surface.

As shown in FIG. 1, the absorbent body 30 is fed into the groove forming section 240 by the suction conveyor 221 of the first absorbent body transport section 220. In FIG. 1, the speed at which the first absorber transport unit 220 feeds the absorber 30 into the groove forming unit 240 is indicated by reference numeral V ₁ . To adjust the speed V ₁ was uniquely To adjust the speed of the suction conveyor 221 may be adjusted the rate of formation of the absorber 30 in the absorber forming part 210 accordingly.

  The continuous body of the top sheet 10 is unwound from a raw roll (not shown) and is conveyed onto the skin facing surface of the absorbent body 30 by the sheet conveying unit 230 (sheet conveying step). The continuous body of the top sheet 10 is superposed on the skin facing surface of the absorbent body 30 by the sheet conveying unit 230 and then fed into the groove forming unit 240. The top sheet 10 is a sheet-like member that is in direct contact with the skin of the wearer's crotch and allows body fluid such as urine to pass through the absorbent body 30. For this reason, the top sheet 10 is comprised with a highly permeable liquid-permeable material. The liquid permeability means, for example, a property of permeating water in a time of less than 1 minute when 5 ml of water at room temperature is placed thereon under a standard atmospheric pressure. As the liquid permeable material constituting the top sheet 10, for example, a woven fabric, a non-woven fabric, a porous film, or the like can be adopted. For example, fibers of a thermoplastic resin such as polypropylene, polyethylene, polyester, nylon are used. A non-woven fabric that has been subjected to a hydrophilic treatment can also be used. As a nonwoven fabric, an air through nonwoven fabric, a point bond nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric etc. can be mentioned, for example.

As illustrated in FIG. 1, the sheet conveying unit 230 includes a speed adjustment roller 231. The speed adjusting roller 231 adjusts the speed at which the continuous body of the top sheet 10 is fed into the groove forming unit 240. For example, the speed adjusting roller 231 is provided on each side of the continuous body of the top sheet 10 and rotates so as to sandwich the continuous body of the top sheet 10 from both sides. In FIG. 1, the speed at which the sheet conveying unit 230 feeds the absorber 30 into the groove forming unit 240 is indicated by reference numeral V < _b > ₂ . To adjust the speed V ₂ may be adjusted to the rotational speed of the pair of speed adjusting roller 231.

  As shown in FIG. 1, the sheet conveying unit 230 includes a glue gun 232 on the downstream side of the speed adjustment roller 231. The glue gun 232 is a device for applying an adhesive such as hot melt, and may be a type that ejects a mist-like adhesive, or a type that applies a liquid adhesive in a linear or dotted manner. May be. In the present embodiment, the glue gun 232 is installed so as to form an adhesive layer by applying an adhesive to the skin non-facing surface (surface on the absorber 30 side) of the continuous body of the top sheet 10. The glue gun 232 can be installed so that an adhesive is applied to the skin facing surface (the surface on the top sheet 10 side) of the absorbent body 30 instead of the skin non-facing surface of the top sheet 10. Thus, the glue gun 232 may be provided at a position where the top sheet 10 and the absorbent body 30 can be bonded by an adhesive.

  The sheet conveyance unit 230 may include one or a plurality of guide rollers 233 in order to change the traveling direction of the continuous body of the top sheet 10. When the guide roller 233 is provided on the downstream side of the glue gun 232 (that is, between the glue gun 232 and the groove forming portion 240), the guide roller 233 is arranged so that the adhesive adhered to the top sheet 10 does not touch the guide roller 233. The top sheet 10 is disposed so as to be in contact with the side opposite to the adhesive application surface. The guide roller 233 is disposed not only between the glue gun 232 and the groove forming portion 240 but also at an appropriate position such as between the raw roll of the top sheet 10 and the speed adjusting roller 231 or between the speed adjusting roller 231 and the glue gun 232. Can be provided.

As illustrated in FIG. 1, the continuous body of the top sheet 10 conveyed by the sheet conveying unit 230 is superimposed on the skin facing surface side of the absorber 30 conveyed by the first absorber conveying unit 220. It is introduced into the groove forming part 240 together with the absorber 30. The velocity _{V 1} of the first absorbent body conveyance unit 220 sends out the absorber 30 to the groove forming portion 240, the speed _{V 2} of the sheet conveying section 230 feeds the top sheet 10 into the groove forming portion 240 for different the absorber 30 The top sheet 10 is introduced into the groove forming portion 240 at different speeds (V ₂ > V ₁ ). The groove formation part 240 forms the pressing groove 40 with a desired pattern with respect to the laminated body of the top sheet 10 and the absorber 30 (groove formation process). The compressed groove 40 is formed at least on the surface on the side where the top sheet 10 is arranged, of the laminate of the top sheet 10 and the absorber 30. That is, the pressing groove 40 is formed in the top sheet 10 and the absorber 30 by pressing these laminated bodies from the top sheet 10 side. When the laminate is pressed from the top sheet 10 side, pressure is applied to the laminate as a reaction from the absorber 30 side.

  The groove forming part 240 includes an embossing roller 241. The embossing roller 241 has a projection 242 having a desired pattern for forming the pressing groove 40 on the peripheral surface thereof. As shown in FIG. 1, when the laminated body is conveyed to the downstream side by the suction conveyor 221, the surface on the top sheet 10 side is partially compressed by being pressed by the protrusion 242 of the embossing roller 241. That is, the laminated body is sandwiched between the conveyance surface of the suction conveyor 221 and the protrusion 242 of the embossing roller 241. When the laminate passes through the embossing roller 241, the compressed grooves 40 that match the pattern of the protrusions 242 are formed on the surface of the laminate on the top sheet 10 side.

Referring to FIGS. 2 and 3, it will be described in detail the relationship of the speed V ₂ for feeding the absorber 30 the speed V ₁ and the top sheet 10 for feeding into the groove forming portion 240 into the groove forming portion 240.

  FIG. 2 is a plan view of the laminate of the top sheet 10 and the absorber 30 as viewed from the top sheet 10 side (skin facing surface side). In FIG. 2, the top sheet 10 is indicated by a solid line, and the absorber 30 and the compressed groove 40 are indicated by a broken line. As shown in FIG. 2, in the present embodiment, the absorbent body 30 has a substantially rectangular shape with the transport direction (MD) as a longitudinal direction, but the shape of the absorbent body 30 is not limited to the one shown here. Of course, a so-called hourglass shape having a narrowed portion in the center in the conveying direction is also possible.

  On the surface (substantially flat) on the top sheet 10 side of the laminate, a plurality of compressed grooves 40 extending in the orthogonal direction (CD) of the conveying direction (four locations in the illustrated example) are formed at intervals in the conveying direction. . In the illustrated example, the pressing groove 40 is a substantially rectangular shape that extends in the orthogonal direction when the laminate is viewed in plan. The shape extending in the orthogonal direction means a shape in which the length in the orthogonal direction (CD direction) is longer than the length in the transport direction (MD direction).

  FIG. 3 is a diagram schematically showing a cross-sectional configuration taken along the line III-III shown in FIG. 2, and conceptually separates the continuous body of the top sheet 10 in which the compressed grooves 40 are formed and the absorbent body 30. It shows. In the upper part of FIG. 3, a part of the continuum of the top sheet 10 extracted and stretched in the transport direction (reference numeral 10 ′) is conceptually shown.

  As shown in FIG. 3, the cross-sectional shape of the compressed groove 40 is a rectangular shape or can be approximated to a rectangular shape such as a trapezoidal shape. The cross-sectional shape approximated to a rectangle includes a trapezoidal shape and a triangular or semicircular cross-sectional shape. The shape of the protruding portion 242 of the embossing roller 241 basically corresponds to the shape of the pressing groove 40 on the laminated body side. However, considering the pushing back and restoring force by the laminated body, The shape of the squeezing groove 40 may be different from that of the squeezing groove 40). That is, the shape of the protrusion 242 of the embossing roller 241 and the rotation speed of the embossing roller 241 may be set based on the shape of the completed (designed) pressing groove 40.

As shown in FIG. 3, the length of the absorber 30 in the transport direction is L. Let T be the time required for the first absorber transport section 220 (specifically, the suction conveyor 221) to transport one absorber L of length L. Since the first absorber transport unit 220 transports the absorber 30 at the speed V ₁ , the formula L = V ₁ × T is established.

  Let N be the number of squeezing grooves 40 in the transport direction. The number N of the pressing grooves 40 referred to here is the number of pressing grooves in a portion where the number of the pressing grooves 40 is the largest in the conveyance direction. That is, depending on the pattern of the compressed groove 40, the number of intersections between the virtual straight line extending in parallel with the transport direction and the compressed groove may vary depending on the location. In that case, the number N of the pressing grooves 40 is counted on the basis of the portion having the largest number of intersections between the virtual straight line extending in parallel with the conveying direction and the pressing grooves. In the example shown in FIGS. 2 and 3, the number N of compressed grooves 40 is four. For example, in the example shown in FIG. 4, the number N of squeezing grooves in the transport direction differs depending on the CD direction. For example, N at the position indicated by P in the figure is 13. N is 24 at the position indicated by V-V. In such an absorptive main body, N is a number of 13 or more and 24 or less, the average value neighborhood 18-19 of the smallest number 13 and the largest number 24, or the smallest number of neighborhoods (in this example, for example, 11 To 15), preferably the most frequent number 24, or the vicinity thereof (for example, 20 to 26 in this example). In addition, as shown in FIG. 2, the area | region where the pressing groove 40 is not formed also exists in the vicinity of the both-sides edge of the orthogonal | vertical direction of a laminated body seeing in a conveyance direction. When counting the number N of the pressing grooves 40, the area where the pressing grooves 40 are not formed is excluded, and the number N of the pressing grooves 40 is within a range including at least one pressing groove 40 in the conveying direction. It is good to count.

As shown in FIG. 3, the depth of the compressed groove 40 is D. In FIG. 3, the depths D of the compressed grooves 40 are substantially equal to each other, but the depths of the compressed grooves 40 may be different from each other. When the several pressing groove 40 has a different depth, the depth D of the pressing groove 40 here can be made into the average value (number average) with respect to the number N of the above-mentioned pressing grooves 40. FIG. For example, when the number of pressing grooves N in the most number of sites in the conveying direction is N = 10, two pressing grooves 40 having a depth of 4 mm are formed and eight pressing grooves 40 having a depth of 1 mm are formed. In addition, the depth D of the compressed groove 40 may be 1.6 mm. Of course, a median value or a mode value can also be adopted.
Conveyance in which the sheet conveying unit 230 conveys the top sheet 10 toward the groove forming unit 240 per unit time T required to convey one absorber L having a length L by the first absorber conveying unit 220. Let X be the length. In the present embodiment, as shown in the upper part of FIG. 3, the transport length X is obtained by cutting a top sheet 10 having a length equal to that of the absorber 30 from the laminate in which the compressed grooves 40 are formed. This corresponds to the length of the top sheet 10 in the conveying direction when the compressed groove 40 formed in the above is extended to a state without wrinkles. That is, in this example, the transport length X of the top sheet 10 per unit time T is expressed as X = V ₂ × T.

The sheet conveying unit 230, as the transport length X is in a range satisfying the following expression, it is preferable to adjust the speed V ₂ for feeding towards the top sheet 10 in the groove forming portion 240.
[Formula] L <X ≦ L + N × 2D
Here, “2D” means that when a part of the top sheet 10 is appropriately inserted into the pressing groove 40 having a depth D, the top sheet 10 has a side wall of the pressing groove 40. This is because a falling portion and a rising portion are formed, and a length approximately twice as long as the depth D is required. Further, since there is a relationship of X = V ₂ × T, if the value of X is determined within the range of the above formula, an appropriate V ₂ can be determined from the relationship of V ₂ = X / T. Furthermore, when actually determining the speed V ₂ is preferably speed setting with particular consideration of the extension of the topsheet 10.
However, as is clear from the description so far, X can also be outside the above formula range (for example, near the minimum value L or near the maximum value L + N × 2D).

As conveying length X of the top sheet 10 is greater than the length L of the absorber 30, by adjusting the conveying speed V ₂ of the top sheet 10, a margin (excess) is born in the top sheet 10. For this reason, the top sheet 10 can easily enter the groove portion of the absorber 30. Moreover, the conveyance length X of the top sheet 10 is L + N × 2D (an appropriate margin value obtained by multiplying the number N of compressed grooves by twice the depth D of the compressed grooves is added to the length L of the absorber. Value) By adjusting the conveying speed V ₂ of the top sheet 10 so as to be below, the top sheet 10 is pulled by the protrusions 242 when the compressed groove 40 is formed, and the top sheet 10 is torn. Or being easily broken. That is, when focusing on reducing the load on the top sheet 10, it is preferable to set N to be close to the maximum value as described above, and to set X to be close to the maximum value L + N × 2D. Further, if N is set to the vicinity of the minimum value or X is set to the vicinity of the minimum value L, it is possible to prevent the top sheet 10 from being dubbed, and the appearance of the absorbent article 100 as a whole is deteriorated, or the absorbent article 100 is deteriorated. It can prevent that the surface feels bad.

  Moreover, the above-described relational expression indicates that the transport length X of the top sheet 10 per unit time T exceeds the length L of the absorbent body 30 in the transport direction, and the compressed groove 40 is formed by the groove forming unit 240. In other words, it can be paraphrased to be equal to or shorter than the surface length in the conveying direction on the surface of the laminated body. The surface length of the surface of the laminate referred to here is the length traced on the surface of the laminate, and since this surface length includes the length of the side wall of the compressed groove 40, the length of the absorber 30 accordingly. Longer than L. If the transport length X of the top sheet 10 is equal to the surface length in the transport direction on the surface of the laminate, there is no gap between the top sheet 10 and the absorber 30 in the portion where the compressed groove 40 is formed, and the protrusion The top sheet 10 can be prevented from being pulled by the portion 242, and the top sheet 10 can be prevented from being dug. That is, when the top sheet 10 is folded along the pressing groove 40 by the protrusions 242, the top sheet 10 is attached in a stretched state (extended state), and the top sheet 10 is easily peeled off from the pressing groove 40. It is preferable because it can be prevented from being broken or easily broken. In particular, when SAP is contained in the absorbent body 30, there is a concern that SAP may break through the top sheet, particularly when forming the compressed groove, but if the top sheet 10 and the absorbent body 30 are carried in as described above, the top sheet 10 is Compared with the case where the sheet is carried in an expanded state, the top sheet 10 can be extremely effectively prevented from being torn or easily torn. On the other hand, when the top sheet 10 is dubbed at the site where the compressed groove 40 is formed, a small wrinkle is generated on the surface of the top sheet 10 and the appearance is deteriorated. Such a state in which the top sheet 10 is dubbed is a state in which the top sheet 10 is shorter than the surface length of the laminate, that is, between the top sheet 10 and the absorber 30 in the portion where the compressed groove 40 is formed. It can be said that the state is worse than the state in which the gap is generated. For this reason, it is preferable to limit the conveyance length X of the top sheet 10 to the surface length of the laminated body or less.

In the schematic diagram of the manufacturing apparatus 200 shown in FIG. 1, the peripheral speed when the embossing roller 241 rotates is indicated by V ₃ . Calculated peripheral speed V ₃ is calculated by multiplying pi to the diameter of the circle formed by the base of the protrusion 242 (the outer peripheral portion of the embossing roller 241 of the absence protrusion 242), further multiplied by the rotational speed it can. The top sheet 10 and the absorbent body 30 fed into the groove forming portion 240 are formed with the compressed groove 40 by the protrusion 242 of the embossing roller 241, and according to the peripheral speed V ₃ of the embossing roller 241 and the conveying speed V _{1 of the} suction conveyor 221. It passes through the groove forming part 240. Therefore, it is preferable conveyance speed _{V 1} of the peripheral velocity _{V 3} and the suction conveyor 221 of the embossing roller 241 is constant velocity _(V 1 = V ₃₎ and thus, constant velocity speed _{V 1} and the speed _{V 3} By doing so, the compressed groove 40 can be basically formed in each of the plurality of absorbers 30 in the same pattern. Further, the relationship among the speed V _{1 at} which the absorbent body 30 is fed into the groove forming section 240, the speed V _{2 at} which the continuous body of the top sheet 10 is fed into the groove forming section 240, and the peripheral speed V ₃ of the embossing roller 241 is V ₂ > V a ₁ = _{V 3.} In other words, the velocity _{V 2} is faster than the speed _{V 3.}

  Moreover, when forming the pressing groove 40 with respect to the laminated body of the top sheet 10 and the absorber 30 with the embossing roller 241, you may heat the area | region which forms the pressing groove 40 in a laminated body. For example, the embossing roller 241 includes a heating mechanism that can heat at least the protrusions 242 provided on the peripheral surface thereof. Thereby, when pressing the laminated body with the projection part 242 and forming the pressing groove 40, the press location can be heated. In this example, since the hot melt adhesive is applied to the top sheet 10 by the glue gun 232, the hot melt adhesive is melted by the heating mechanism and the top sheet 10 and the absorber 30 are bonded to each other in the crimp groove 40. be able to. Moreover, the bonding force of the top sheet 10 and the absorber 30 in the site | part in which the pressing groove 40 was formed can be heightened by pressing a laminated body while heating, and forming the pressing groove 40. FIG. When the top sheet 10 is formed of a nonwoven fabric made of a thermoplastic resin, for example, the top sheet 10 enters the groove portion of the absorbent body 30 because the elongation force is increased by partially heating the top sheet 10. It becomes easy.

  On the downstream side of the groove forming portion 240, a continuous bonding portion 250 of the back sheet 20 is provided. The backsheet 20 is a sheet-like member for preventing body fluid that has passed through the topsheet 10 and is absorbed by the absorber 30 from leaking out of the diaper. For this reason, it is preferable that the back sheet 20 is comprised with a liquid-impermeable material. The liquid impermeability means, for example, a property that, when 5 ml of room temperature water is placed thereon under a standard atmospheric pressure, the water does not permeate even after 1 minute or more. An example of the liquid-impermeable material constituting the backsheet 20 is a liquid-impermeable film made of polyethylene resin. In particular, as the back sheet 20, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed in order to ensure air permeability while maintaining liquid impermeability.

  The bonding unit 250 of the back sheet 20 includes a glue gun 251 and a bonding roller 252. The glue gun 251 has the same configuration as the glue gun 231 for bonding the top sheet 10 described above. In the glue gun 251, an adhesive is applied to the skin facing surface (surface on the absorber 30 side) of the back sheet 20 that is fed out from a raw roll (not shown). The laminating roller 252 conveys the back sheet 20 coated with the adhesive toward the downstream side, and superimposes the back sheet 20 on the laminate of the top sheet 10 and the absorber 30. Thereby, the laminated body by which the top sheet 10, the absorber 30, and the back sheet 20 were laminated | stacked in this order is formed.

  A second absorbent body transport unit 260 is provided on the downstream side of the bonding unit 250 of the backsheet 20. The second absorber transport unit 260 includes a transport conveyor 261 and a compression roller 262. The conveyance conveyor 261 conveys the laminated body of the top sheet 10, the absorber 30, and the back sheet 20 described above toward the apparatus downstream side. The compression roller 262 compresses the laminated body in the thickness direction by pressing the laminated body from the surface side of the top sheet 10. That is, the laminate is sandwiched between the transport surface of the transport conveyor 261 and the peripheral surface of the compression roller 262.

  Through the above steps, a laminate in which the top sheet 10 is bonded to the skin facing surface of the absorber 30 and the back sheet 20 is bonded to the non-skin facing surface of the absorber 30 is obtained. By cutting the laminated body thus obtained between the absorbent bodies 30, individual absorbent articles 100 can be obtained. Although the illustration of the cutting portion is omitted, a known cutter roller having a cutter blade on the peripheral surface may be used. In addition, in the said embodiment, although the example which manufactured the top sheet 10 and the back sheet 20 with the continuous body was shown, naturally it is also possible to cut | disconnect in an intermediate | middle process and to manufacture an absorbent article separately. .

  Although not shown in FIG. 1, a cover sheet 21 may further be provided on the skin non-facing surface side of the back sheet 20. An adhesive layer may be provided between the cover sheet 21 and the back sheet 20 in the whole or a part of the region where both come into contact, and both may be joined. A known method as described above may be adopted as a method for forming and bonding the adhesive layer.

  The above manufacturing method can be particularly suitably used when the top sheet 10 is formed of a material that is difficult to stretch (that is, has low extensibility). That is, when the top sheet 10 is difficult to stretch, if the top sheet 10 and the absorbent body 30 are formed without pressing the top sheet 10 with a margin, when the top sheet 10 is pressed, There is a risk of partial damage. Further, if the top sheet 10 is difficult to stretch, the top sheet 10 does not reach the bottom surface of the groove portion of the absorbent body 30 and a gap is formed between the top sheet 10 and the absorbent body 30 or the time is increased. It is conceivable that problems such as the top sheet 10 being peeled off from the groove portion of the absorber 30 occur with the progress. When the pressing groove 40 is formed in a state where the top sheet 10 is pulled, the top sheet 10 is easily broken. Therefore, the SAP contained in the absorbent body 30 may break the top sheet 10 when squeezing, but this problem is caused by squeezing after the top sheet 10 is not pulled more than the steady state. Can be eliminated and improved. That is, in the manufacturing method according to the present embodiment, even when the top sheet 10 is formed of a material that does not easily stretch, the top sheet 10 is appropriately adhered to the groove portion of the absorber 30 without causing damage. be able to.

  For example, it can be said that the top sheet 10 is difficult to stretch when the elongation stress at the time of 5% elongation in the conveying direction (5% elongation stress) is 10 N or more. It is particularly suitable for manufacturing the absorbent article 100 using such a top sheet 10. Moreover, this manufacturing method is suitable for the top sheet 10 having a 5% elongation stress of 15 N or more, and more preferably 20 N or more or 25 N or more. The elongation stress is measured by extending the sheet member (top sheet 10) to be measured in the conveyance direction according to JIS L 1913: 2010) 6.3.1. At this time, the holding interval of the tensile tester is set to 100 mm, and the load at the time of 5% elongation when the sheet member is pulled at a tensile speed of 300 mm / min is obtained as the elongation stress at the time of 5% elongation. The 5% elongation stress is measured at standard time (not wet).

Thus, when the top sheet 10 is formed of a material that does not easily stretch, the transport length X of the top sheet 10 per unit time T described above is transported on the surface of the laminate in which the compressed grooves 40 are formed. A value closer to the surface length in the direction is preferred. For example, when the surface length in the transport direction on the surface of the laminate on which the compressed grooves 40 are formed is A and the length of the absorbent body 30 in the transport direction is L, the top sheet 10 is transported per unit time T. The length X is preferably a value closer to A than the average value of A and L ((A + L) / 2). That is, when the 5% elongation stress of the top sheet 10 is 10 N or more, the transport length X is preferably in the range of the following relational expression.
[Formula] (A + L) / 2 <X ≦ A
L + N × 2D can be substituted for the value of A. For example, X can be a value before and after A (for example, a value exceeding A).

  As described above, the absorbent body 30 is made of pulp, SAP, or the like, and thus easily deforms with respect to pressure in the vertical direction, whereas the top sheet 10 is made of nonwoven fabric or the like. Is made of a material that is difficult to stretch. Thus, the manufacturing method according to the present embodiment creates and maintains the compressed groove 40 as designed in the combination of the absorber 30 that is easily deformed and the sheet member that is not easily deformed (particularly the top sheet 10). Virtually possible.

  Even when a material that is easily stretched is used for the top sheet 10, if the top sheet 10 is bent so as to be stretched when the compressed groove 40 is formed, the stretched portion is easily broken. On the other hand, in the present embodiment, even when such a material is used, the compressed groove 40 can be formed in a state where the top sheet 10 is not stretched / substantially stretched. Has the effects and effects.

  Next, another preferred embodiment will be described with reference to FIGS. 4 and 5. 4 shows a plan view of the absorbent article 100 manufactured by the above-described manufacturing method, and FIG. 5 shows a cross-sectional view in the transport direction along the line V-V in FIG. As shown in FIG.4 and FIG.5, as for the absorbent article 100, the absorber 30 is provided between the top sheet 10 and the back sheet 20, and the pressing groove 40 extends in the thickness direction over the top sheet 10 and the absorber 30. The formed structure.

  The pressing groove 40 is formed by simultaneously pressing the top sheet 10 and the absorber 30 by the groove forming portion 240 shown in FIG. As a result, the compressed groove 40 is formed in the thickness direction across the top sheet 10 and the absorber 30. In the site | part in which the pressing groove 40 was formed, the density of the absorptive material which comprises the absorber 30 will increase.

  In the present embodiment, as shown in FIG. 4, the pressing groove 40 includes a first pressing groove 41 inclined in one direction with respect to a virtual line P extending in parallel with the transport direction, and the other with respect to the virtual line P. A second pressing groove 42 inclined to the side. A plurality of first squeezing grooves 41 and a plurality of second squeezing grooves 42 are respectively formed, and the plurality of first squeezing grooves 41 are all parallel (the inclination angles with respect to the imaginary line P are equiangular). The grooves 42 are all parallel (the inclination angle with respect to the virtual line P is equal). Moreover, the 1st pressing groove 41 and the 2nd pressing groove 42 cross | intersect each other. Specifically, each of the first pressing grooves 41 preferably intersects with the plurality of second pressing grooves 42. Similarly, each of the second pressing grooves 42 includes a plurality of first pressing grooves 41. It is preferable to cross.

  More specifically, as shown in FIG. 4, the pressing grooves 40 formed in the top sheet 10 and the absorber 30 are formed in a rhombic lattice pattern. The “rhombic lattice pattern” referred to here is a pattern in which a plurality of compressed grooves extending in a direction inclined with respect to the transport direction and the orthogonal direction intersect to define a rhombic (diamond) non-squeezed region. Say. For this reason, angle (theta) in which each pressing groove inclines with respect to the virtual line P extended in parallel with a conveyance direction is less than 90 degree | times, especially in the range of 20-80 degree | times, 30-60 degree | times, or 40-50 degree | times. Preferably there is. In the illustrated example, the inclination angle θ of each pressing groove is 45 degrees. Further, the rhombic lattice pattern is a regular pattern in which the non-squeezed regions 43 surrounded by the pressing grooves 41 and 42 on all sides become a regular rhombus (regular rhombus). Thus, in the rhombic lattice pattern, the plurality of first pressing grooves 41, the plurality of second pressing grooves 42, the non-squeezing region 43 surrounded by the pressing grooves 41, 42, and the first It can be thought that the intersection 44 where the pressing groove 41 and the second pressing groove 42 intersect is formed.

  Here, the specific numerical value regarding the absorber 30 is demonstrated. The thickness of the absorber 30, that is, the thickness of the non-compressed region 43 is preferably 10 mm to 40 mm, and particularly preferably 15 mm to 30 mm. Moreover, it is preferable that it is 30-95% with respect to the thickness of the absorber 30, and, as for the depth of the pressing groove 40, it is especially preferable that it is 50-95% or 60-95%. For example, the thickness of the absorber 30 in the site | part in which the pressing groove 40 was formed should just be at least 1 mm or more, and it is preferable that it is especially 2 mm or more or 5 mm or more.

The width of the compressed groove 40 is preferably 1 mm to 5 mm, and particularly preferably 2 mm to 4 mm. Diagonal length _{D 1} in the conveying direction of the non-compressed regions 43 shown in FIG. 4 is preferably 10 mm to 50 mm, preferably a particular 20mm~40mm or 30 mm,. A preferred numerical range of the orthogonal diagonal in the direction length D ₂ of the non-compressed regions 43 are the same as the length D ₁ described above. The length D ₁ and length D ₂ is preferably approximately equal or may be different. The shape of the non-compressed region 43 is not limited to a regular rhombic shape (regular rhombus), and may be other rhombic shapes.

  The compressed groove 40 formed in the absorbent body 30 is formed in a wide range over the conveying direction so that the body fluid discharged in the vicinity of the crotch part of the absorbent body 30 can be diffused widely to the front body and the back body. It is preferable. Specifically, it is preferable that the length of the conveyance direction of the area | region in which the pressing groove 40 was formed is 60% or more with respect to the length of the conveyance direction of each absorber 30, 60%-100%, 70 % To 100%, or 80% to 100% is particularly preferable. The compressed groove 40 formed in the absorbent body 30 may be formed in a wide range in the orthogonal direction so that the body fluid discharged in the vicinity of the center in the orthogonal direction can be widely diffused outward in the orthogonal direction. preferable. Specifically, the maximum width in the orthogonal direction of the region in which the compressed groove 40 is formed is preferably 60% or more with respect to the minimum width in the orthogonal direction of each absorber 30, and is 60% to 100%, 70 % To 100%, or 80% to 100% is particularly preferable.

  As shown in FIG. 4, when the pressing grooves 40 are formed in a rhombic lattice shape, the number of the pressing grooves 40 in the transport direction described above varies depending on the part. For this reason, let the number N of the pressing grooves 40 be the number of the pressing grooves in the site | part with the largest number of the pressing grooves 40 seeing in a conveyance direction. Specifically, counting is performed on the basis of a portion where the number of intersections between the virtual straight line extending in parallel with the transport direction and the compressed groove 40 is the largest. In the example shown in FIG. 4, the VV line extending in parallel with the transport direction is an imaginary straight line that passes through a portion having the largest number of intersections with the compressed groove 40. When the pattern of the pressing groove 40 shown in FIG. 4 is assumed, the number N of the pressing grooves 40 is the number of intersections between the VV line and the pressing groove 40, that is, 24.

  The pattern of the pressing groove 40 is not limited to the above-described rhombic lattice pattern, and may be a square lattice pattern, for example. Here, the “square grid pattern” means that a plurality of squeezing grooves extending in parallel with the conveying direction intersect with a plurality of squeezing grooves extending in parallel with the orthogonal direction to define a square non-squeezed region. A pattern. In particular, a regular pattern in which all of the non-compressed areas surrounded by the pressing grooves are square is called a square lattice pattern.

  Thus, in this Embodiment, it is preferable to form the pressing groove 40 with a “grid-like pattern” including a rhombic lattice shape and a rectangular lattice shape. That is, it is preferable to form a rectangular or oblique non-compressed region surrounded by the compressed grooves 40 with the compressed grooves 40 formed in the absorber 30 and the top sheet 10 as a lattice pattern. According to such a form, since the pressing groove 40 at least partially intersects, it becomes possible to diffuse body fluid over a wide range. Moreover, since the pressing groove 40 formed with the grid | lattice pattern produces a moderate clearance gap between a wearer's skin, the air permeability and the touch of the top sheet 10 can further be improved. From such a viewpoint, it can be said that this manufacturing method is suitable for the form which forms the pressing groove 40 in the laminated body of the liquid-permeable top sheet 10 and the absorber 30. FIG.

  In the illustrated embodiment, the absorbent body 30 is described as an example in which the absorbent body 30 is composed only of the absorbent material. However, the absorber 30 may have a structure in which an absorbent material is covered with a core wrap sheet. The core wrap sheet wraps the absorbent core made of the absorbent material, thereby preventing the absorbent material from leaking out. The core wrap sheet is preferably composed of a hydrophilic nonwoven fabric having softness and strength. Examples of the nonwoven fabric constituting the core wrap sheet include those obtained by hydrophilizing a spunbond nonwoven fabric, an air-through nonwoven fabric, a point bond nonwoven fabric, a spunlace nonwoven fabric, and the like. Moreover, as a core wrap sheet | seat, well-known tissue paper etc. can be used besides a nonwoven fabric.

  As mentioned above, in this specification, in order to express the content of this invention, embodiment of this invention was described, referring drawings. However, the present invention is not limited to the above-described embodiment, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  The present invention can be suitably used in the manufacturing industry of absorbent articles such as disposable diapers.

DESCRIPTION OF SYMBOLS 10 ... Top sheet 20 ... Back sheet 21 ... Cover sheet 30 ... Absorbent body 40 ... Pressing groove 41 ... 1st pressing groove 42 ... 2nd pressing groove 43 ... Non-pressing area | region 44 ... Intersection part 100 ... Absorbent article 200 ... Manufacturing apparatus 210 ... Absorber molding unit 211 ... Chamber 212 ... Molding drum 213 ... Recess 214 ... Air hole 220 ... First absorber transport unit 221 ... Suction conveyor 222 ... Drive roller 223 ... Follower roller 224 ... Perforated belt 225 ... Suction box 230: Sheet conveying portion 231: Speed adjusting roller 232 ... Glue gun 233 ... Guide roller 240 ... Groove forming portion 241 ... Embossing roller 242 ... Protruding portion 250 ... Pasting portion 251 ... Glue gun 252 ... Pasting roller 260 ... Second absorber Conveying section 261 ... Conveying conveyor 262 ... Compression roller

Claims (10)

A method of manufacturing an absorbent article in which an absorbent body and a sheet member are laminated,
An absorbent body transporting process for transporting the absorbent body;
A sheet conveying step of conveying the sheet member onto the absorber;
In the state where the absorbent body and the sheet member overlap, a groove forming step of pressing one of the laminated bodies from the sheet member side by a groove forming portion to form one or a plurality of compressed grooves in the laminated body; Including
The method for manufacturing an absorbent article, wherein a speed at which the sheet member is fed into the groove forming portion in the sheet conveying step is faster than a speed at which the absorber is fed into the groove forming portion in the absorber conveying step. The length of the absorber in the transport direction is L,
The number of the compressed grooves in the transport direction is N,
When the depth of the compressed groove is D,
The transport length X of transporting the sheet member toward the groove forming portion in the sheet transporting process per unit time required to transport one absorber in the absorbent body transporting process is L <X The manufacturing method according to claim 1, wherein ≦ L + N × 2D. The number N of the said pressing grooves is the number of the said pressing grooves in the site | part with the largest number of the said pressing grooves seeing in a conveyance direction. The manufacturing method of Claim 2. The transport length X for transporting the sheet member toward the groove forming portion in the sheet transport process per unit time required to transport one absorber in the absorber transport process is as follows:
Exceeds the length of the absorber in the transport direction, and
The manufacturing method according to claim 1 which is below the surface length of the conveyance direction in the surface of the layered product in which the compressed groove was formed by the groove formation part. The manufacturing method according to claim 4, wherein the surface length is a surface length at a portion where the surface length of the laminate is the longest in the transport direction. The manufacturing method according to any one of claims 1 to 5, wherein the sheet member is a non-woven fabric. The manufacturing method according to any one of claims 1 to 6, wherein an elongation stress at the time of 5% elongation in the conveyance direction of the sheet member is 10 N or more. The manufacturing method according to any one of claims 1 to 7, wherein the absorber is conveyed by a suction conveyor in the absorber conveying step. The manufacturing method according to any one of claims 1 to 8, wherein, in the groove forming step, a region where the compressed groove is formed in the laminated body is heated simultaneously with pressing the laminated body. An absorbent article manufacturing apparatus in which an absorbent body and a sheet member are laminated,
An absorber transport section for transporting the absorber;
A sheet conveying section for conveying the sheet member onto the absorber;
In a state where the absorbent body and the sheet member are overlapped with each other, the laminate body is pressed from the sheet member side to form one or a plurality of compressed grooves in the laminate body, and
An apparatus for manufacturing an absorbent article, wherein a speed at which the sheet conveying unit feeds the sheet member into the groove forming unit is faster than a speed at which the absorber conveying unit sends the absorber into the groove forming unit.

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