JP2018144203A - Perforating member, perforating roller, perforating device, and absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perforating member having an enhanced perforating property with respect to a nonwoven fabric, by using a perforating roller with perforating members on its outer periphery and a counter roller.SOLUTION: In a perforating device for perforating a nonwoven fabric by using a perforating roller and a counter roller, perforating members 80 arranged on the outer periphery of the perforating roller include: a tip portion 81 which pierces a thermoplastic nonwoven fabric and gradually expands the pierced holes to form expanded holes; and a heat application part 90 which is constituted of an intermediate part 82 and a base part 83 disposed on a base end side relative to the tip portion 81, and which applies heat to at least either the tip portion 81 or the intermediate part 82.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a perforating member, a perforating roller, a perforating apparatus, and an absorbent article that perforate a non-woven fabric.

Conventionally, various members, such as a nonwoven fabric and an absorber, are laminated | stacked on absorbent articles, such as a paper diaper and a urine pad. Therefore, there is a possibility that the air permeability when the absorbent article is attached to the wearer is lowered.
Therefore, it has been proposed to perforate air holes in the nonwoven fabric of the absorbent article. For example, a technique for perforating a thermoplastic non-woven fabric with a pin-shaped perforated member heated as a whole has been studied (see Patent Document 1).

Japanese Unexamined Patent Publication No. 06-330443

  However, as described above, when the perforated member heated as a whole is used for perforating the nonwoven fabric, it causes a decrease in energy efficiency, and it is difficult to adjust the thermal energy transmitted to the nonwoven fabric. There is a possibility that the piercing property is lowered. Therefore, there is room for improvement in improving the perforation property to the nonwoven fabric.

  This case has been devised in view of the problems as described above, and one of the purposes is to improve the perforation property to the nonwoven fabric. It should be noted that the present invention is not limited to the purpose here, and is an operation and effect derived from each configuration shown in the `` Mode for Carrying Out the Invention '' to be described later, and can also exhibit an operation and an effect that cannot be obtained by conventional techniques. It can be positioned as another purpose of this case.

(1) The perforated member disclosed herein includes a distal end portion that pierces a thermoplastic non-woven fabric to gradually widen the puncture hole to perforate the expanded hole, and an intermediate portion disposed on the proximal end side with respect to the distal end portion. And a heat applying unit that applies heat to at least one of the tip and the intermediate part. In addition, the application part of the heat by the heat application part may be other parts in addition to the tip part and the intermediate part.
(2) The perforating roller disclosed here includes the perforating member on the outer peripheral portion.
(3) A punching device disclosed herein includes the above-described punching roller.

  (4) Moreover, the absorbent article disclosed here is provided with the nonwoven fabric perforated by the perforating apparatus described above.

  According to this case, the perforation property to a nonwoven fabric can be improved.

It is an expanded view of the paper diaper (absorbent article) regarding one Embodiment. It is AA arrow sectional drawing of FIG. In FIG. 2, the thickness of each sheet is exaggerated for easy understanding of each configuration. It is a schematic diagram which shows the principal part of a punching apparatus. It is a side view of a pin (piercing member). The side surface of this figure shows a profile when viewed from the axial direction of a punching roller provided in the punching device. It is a figure which shows the relative positional relationship of a pin and a nonwoven fabric. It is a top view which expands and shows the principal part of the nonwoven fabric perforated by a pin. In this plan view, the relationship between the three puncture holes that are gradually expanded during drilling and the expanded holes that have been drilled (the most expanded puncture) is virtually shown. It is a side view which shows the pin regarding a 1st modification. The side surface of this figure shows the profile when viewed from the axial direction of the piercing roller provided in the piercing device, as in FIG. It is a side view which shows the pin regarding a 2nd modification. The cross section of this figure shows the profile when viewed from the axial direction of the piercing roller provided in the piercing device, as in FIG. It is a top view which expands and shows the principal part of the nonwoven fabric perforated by the conventional pin.

  Hereinafter, the form for implementing this case is demonstrated. The following embodiment is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in this embodiment. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit thereof. Further, it can be selected as necessary, and can be appropriately combined.

  In the embodiment, a piercing member, a piercing roller, and a piercing device will be described. The piercing member is a member that pierces a non-woven fabric to make a hole. The perforating member is provided on the outer peripheral portion of the perforating roller that rotates in a predetermined direction, and forms a part of the perforating roller. This perforating roller is mounted on the perforating device and forms part of the perforating device. In the present embodiment, a punching device in which a counter roller is disposed to face the punching roller is illustrated.

  The nonwoven fabric perforated by the perforating apparatus is used for absorbent articles in order to improve air permeability. This absorbent article is a sanitary article that is worn by a wearer and absorbs and retains liquid moisture such as urine and menstrual blood excreted from the wearer. In addition to absorbent articles such as tape-type and pants-type disposable diapers (so-called “disposable diapers”), the absorbent article includes absorbent bodies such as urine pads, sanitary napkins, and panty liners. Also includes sex goods. In the following embodiment, a pants-type paper diaper is illustrated as an absorbent article.

In the present embodiment, the circumferential direction and the radial direction are determined based on the axis of the perforation roller and the counter roller, and the upstream and downstream directions are determined based on the rotation direction of these rollers and the conveyance direction of the nonwoven fabric. Furthermore, the front end and the base end are determined based on the piercing direction of the piercing member.
Moreover, about a paper diaper, let the direction which ties the front body arrange | positioned facing a wearer's abdomen, and the back body arrange | positioned facing a back part be a longitudinal direction. Between these front body and back body (the center in the longitudinal direction), a crotch part disposed at the wearer's crotch (arranged facing the crotch) is located. Further, in a state where the paper diaper is worn by the wearer (hereinafter abbreviated as “worn state”), the side facing the wearer's skin (inner side) is defined as the skin surface side, and the opposite side (outer side) of the skin surface side is defined as non-skin. The skin side. Furthermore, a direction connecting the skin surface side and the non-skin surface side is a thickness direction, and a direction orthogonal to both the longitudinal direction and the thickness direction is a width direction. In addition, viewing from the thickness direction is a plan view.

  About the direction of each component in a paper diaper, when expressing along a longitudinal direction, for example, it shall include not only parallel to a longitudinal direction but substantially parallel to a longitudinal direction. Specifically, it is assumed that the inclination angle with respect to the longitudinal direction extends below 45 ° along the longitudinal direction. Similarly, in the case where it is expressed along each direction such as the width direction and the thickness direction, it means that the inclination angle with respect to each direction extends below 45 °.

[I. One Embodiment]
[1. Constitution]
Hereinafter, a paper diaper is demonstrated about the structure of this case, and a punching apparatus is demonstrated after that.
[1-1. Paper diaper]
First, the configuration of the disposable diaper 1 will be described with reference to FIGS. 1 and 2.
Here, the disposable diaper 1 is formed symmetrically with respect to the center line C in the width direction. This paper diaper 1 is roughly divided into three regions along the longitudinal direction: a front body 1A, a crotch 1B, and a back body 1C.

<Sheets>
First, the sheets of the disposable diaper 1 will be described.
As shown in FIG. 1, the disposable diaper 1 includes an absorbent body 10 (indicated by a thick broken line) that extends in the longitudinal direction over the front body 1A, the crotch 1B, and the back body 1C.
Here, the hourglass-shaped absorber 10 in which the crotch part 1B is smaller in the width direction dimension than the front body 1A and the back body 1C is illustrated. However, the planar view shape of the absorbent body 10 is not limited to the hourglass shape as described above, but may be a rectangle (that is, the dimension in the width direction is constant) in the planar view, and the circular front body 1A and the back body 1C, respectively. A dumbbell shape may be used.

The absorbent body 10 is a mat-like (or pad-like) member having a water absorption property that absorbs and retains liquid moisture such as urine and menstrual blood excreted from the wearer (hereinafter referred to as “excreted moisture”).
In this absorbent body 10, a superabsorbent polymer (so-called “SAP <Superabsorbent polymer>”, “superabsorbent polymer”, or “superabsorbent polymer”) is applied to pulverized or defibrated pulp (so-called “fluff pulp”). A core mixed with a wrap sheet is wrapped.

As shown in FIG. 2, various sheets 11, 12, 13, and 14 described below are provided on the skin surface side and the non-skin surface side with respect to the absorbent body 10 described above.
A center sheet 11 is laminated on the skin surface side with respect to the absorbent body 10, and a back sheet 12 is laminated on the non-skin surface side. Side sheets 13 are arranged on the lateral sides of these sheets 11 and 12.

The side sheet 13 is laminated on the skin surface side in the width direction side portion of the center sheet 11, and is laminated on the non-skin surface side in the width direction side portion of the back sheet 12.
A cover sheet 14 is laminated on the non-skin surface side of the back sheet 12. Here, the cover sheet 14 is overlapped via the side sheet 13 on the side in the width direction of the back sheet 12.
Of these sheets 11, 12, 13, and 14, nonwoven sheets are used for the sheets 11, 13, and 14. Here, a nonwoven fabric containing a thermoplastic resin is used for the sheets 11, 13, and 14.

Since the center sheet | seat 11 permeate | transmits excretion water | moisture content and makes the absorber 10 absorb it, it has water permeability. Here, in order to suppress the stuffiness in the mounted state, the center sheet 11 having both air permeability is used. As such a center sheet 11, what is called an air through nonwoven fabric can be used.
Further, the center sheet 11 is arranged on the most skin side in the paper diaper 1 (hereinafter also referred to as “top sheet”). The center sheet 11 has a width dimension larger than that of the absorbent body 10, and covers the absorbent body 10 from the skin surface side.

  The back sheet 12 has water permeability in order to prevent liquid leakage from the absorber 10. Here, in order to suppress the stuffiness in the wearing state, the back sheet 12 having both moisture permeability is used. As such a back sheet 12, a moisture-permeable polyethylene (PE <Poly-Ethylene>) film can be used. However, a polypropylene (PP <Poly-Propylene>) film may be used for the back sheet 12.

The side sheet 13 has water permeability in order to prevent liquid leakage to the side in the width direction. As the side sheet 13, a spunbond nonwoven fabric can be used.
Further, a part of the side sheet 13 is disposed on the most skin side in the paper diaper 1 (from this, similarly to the center sheet 11, it is also referred to as “top sheet”). As described above, the side sheet 13 that can contact the wearer includes a melt blown layer such as an SMS (Spunbound Meltblown Spunbound) nonwoven fabric or an SMMS (Spunbound Meltblown Meltblown Spunbound) nonwoven fabric, thereby increasing the flexibility. It is preferable to use a bond nonwoven fabric. Or it is preferable to use the spunbond nonwoven fabric which improved the softness | flexibility by suppressing the fineness and the fabric weight of the fiber which make a spunbond nonwoven fabric.

The “fineness” is a parameter corresponding to the fiber diameter (thickness) and the cross-sectional area of the fiber, and is represented by the weight per predetermined length. For example, the number of grams per 9000 m [denier] for one fiber is used as the “fineness”.
Further, the “weight per unit area” is a parameter corresponding to the thickness of the sheet or the degree of lamination, and is represented by the weight per unit area. For example, the number of grams per square meter is used as the “weight per unit area”.

The cover sheet 14 covers the above-described absorber 10 and the sheets 11, 12, and 13 from the non-skin surface side. Here, as the cover sheet 14, three of the first cover sheet 141, the second cover sheet 142, and the third cover sheet 143 are laminated in this order from the skin surface side toward the non-skin surface side.
The first cover sheet 141 covers the absorbent body 10 from the non-skin surface side via the back sheet 12 (hereinafter also referred to as “pad cover sheet”).

  The second cover sheet 142 and the third cover sheet 143 are set to be larger in the width direction than the first cover sheet 141 in the front body 1A and the back body 1C (see FIG. 1), and in the worn state, , Placed around the belly. The third cover sheet 143 is disposed on the most non-skin surface side in the paper diaper 1 (from this, the third cover sheet 143 is also referred to as an “outer cover sheet”, and the second cover sheet 142 is an “inner cover sheet”. Also called).

  As these cover sheets 141, 142, and 143, a spunbond nonwoven fabric can be used. Furthermore, as the first cover sheet 141, it is preferable to use a highly flexible spunbond nonwoven fabric in the same manner as the side sheet 13 in order to ensure flexible fit inside the disposable diaper 1. Further, as the third cover sheet 143, it is preferable to use a highly flexible spunbonded nonwoven fabric in the same manner as the side sheet 13 in order to ensure a feeling of touch (hand).

As shown in FIG. 1, the cover sheet 14 in the front body 1 </ b> A and the cover sheet 14 in the back body 1 </ b> C are attached to each other in the width direction edge portions 14 a (so-called “side seals”). In this way, the cover sheets 14 of the front body 1A and the back body 1C are continuously provided, and the pant-type paper diaper 1 is formed.
In addition, the back sheet 12 and the cover sheet 14 described above are made of a translucent material that can be seen through on the skin side of the sheets 12 and 14.

  Further, the cover sheet 14 is made of a non-woven fabric provided with vent holes H (only one place is provided for each of the front body 1A and the back body 1C). Here, in order to improve the breathability around the waist and abdomen of the wearer in the wearing state, a part of the cover sheet 14 in the front body 1A and the back body 1C of the paper diaper 1 is perforated. For example, the upper region in the worn state is perforated in the nonwoven fabric used for the cover sheet 14 (first cover sheet 141) laminated on the most skin side. At this time, a non-perforated nonwoven fabric may be used for the nonwoven fabric used for the other cover sheets 142 and 143.

<gather>
Next, the gathers 15 of the disposable diaper 1 will be described with reference to FIGS. 1 and 2.
The gather 15 is composed of a sheet composite that is stretched by a stretchable member (stretchable member) such as rubber, polyurethane, and stretchable film. Here, a thread-like rubber member (hereinafter abbreviated as “thread rubber”) 20 is exemplified as the stretchable member.

  In this paper diaper 1, two types of gathers 16 and 17 to which stretchability is imparted by two types of thread rubbers 21 and 22 are illustrated as gathers 15 formed of the thread rubber 20. One is a three-dimensional gather 16 (also referred to as “side gather”) in which the skin surface side edge portion of the side sheet 13 is gathered together by the first thread rubber 21. The other is the Tammy Gather 17 in which the second cover sheet 142 and the third cover sheet 143 (see FIG. 2) are gathered together by the second rubber thread 22 (a reference numeral is attached to only one place).

The three-dimensional gather 16 is provided in order to prevent leakage of the excrement in the lateral direction of the excrement by enhancing the followability to the wearer at the periphery of the excretion location.
Specifically, as shown in FIG. 2, in the three-dimensional gather 16, the sheet portions 13 a and 13 b positioned at the inner edge in the width direction on the skin surface side of the side sheet 13 are folded and overlapped. The first thread rubber 21 extending in the longitudinal direction is surrounded by the sheet portions 13a and 13b.
1 and 2 exemplify a three-dimensional gather 16 provided with two first thread rubbers 21. However, the number of the first thread rubbers 21 in the three-dimensional gather 16 may be one, or may be three or more.

The tammy gather 17 is provided in order to enhance the followability to the wearer's buttocks and lower abdomen. More specifically, in the Tammy gather 17, a plurality of second rubber threads 22 extending in the width direction, such as warp yarns or warp yarns in a plain fabric, are formed on the second cover sheet 142 and the third cover sheet 143 (see FIG. 2). Intervened in between.
In this way, by incorporating the second rubber thread 22 between the cover sheets 142 and 143, the tammy gather 17 having stretchability around the hip and lower abdomen is formed.
In addition, in addition to or in place of the gathers 16 and 17 described above, leg gathers and support gathers may be provided for enhancing the follow-up to the wearer.

<indicator>
Further, the paper diaper 1 is provided with an indicator 19 (also referred to as “notification sign”) that indicates the presence or absence of urination (excretion).
The indicator 19 is attached to the absorbent body 10 so as to be visible (appearable) from the outside of the disposable diaper 1. The indicator 19 is a layered portion that changes color when wet. Here, an indicator 19 is interposed between the absorbent body 10 and the back sheet 12.

The indicator 19 is provided by applying a water-sensitive material to the skin side of the back sheet 12. For example, the indicator 19 is yellow or orange before it senses moisture (before it gets wet), and changes its color to blue or yellow-green after it senses moisture (after it gets wet).
Since the back sheet 12 and the cover sheet 14 have the translucency as described above, when the indicator 19 is discolored due to excretion moisture, the discolored indicator 19 can be visually recognized from the outside of the paper diaper 1, and whether or not excretion occurs from the outside. Can be recognized.
FIG. 1 illustrates two indicators 19 extending in the longitudinal direction at the center in the width direction. However, the number of indicators 19 may be one or three or more. Further, the extending direction of the indicator 19 is not limited to the longitudinal direction.

<Pressing part>
Below, the groove-shaped pressing part 40 (concave part, pressing groove) squeezed crossing both the longitudinal direction and the width direction is demonstrated. Specifically, at least the absorbent body 10 will be described with a groove-shaped compressed portion 40 formed by compressing a region intersecting both the longitudinal direction and the width direction.
This pressing part 40 is provided by press-molding the absorbent body 10 and the center sheet 11 laminated on the skin surface side of the absorbent body 10. Specifically, the laminated absorbent body 10 and the center sheet 11 are pressed (compressed) from the skin surface side with a convex shape having a predetermined shape (pattern), so that the absorbent body 10 or the center sheet 11 is contained in the pressed portion. The air is squeezed and the squeezed part 40 is formed.

That is, the pressing part 40 is a recessed part provided in the thickness direction. The pressing portion 40 is a groove-like portion that extends linearly so as to intersect both the longitudinal direction and the width direction. In addition, the pressing part 40 is extended except the edge (end part area | region) of the width direction among the absorbers 10. As shown in FIG.
Here, the compressed portion 40 has a plurality of first inclined portions 41 (symbols are attached to only one location in FIG. 1) that are inclined in one direction in the width direction and cross in the other direction in the width direction. A plurality of second inclined portions 42 (symbols are attached to only one place in FIG. 1) are provided. That is, these inclined portions 41 and 42 form a lattice shape (lattice shape, grid pattern) in plan view.
The vent hole H described above is provided in a region obtained by virtually extending the extending region of the pressing portion 40 in the longitudinal direction.

[1-2. Drilling device]
The non-woven fabric 100 used for the cover sheet 14 of the above-described paper diaper 1 is provided with holes to be the air holes H by the punching device 50 described below.
Hereinafter, the configuration of the perforating apparatus 50 will be described with reference to FIGS.
In addition, the punching apparatus 50 may be a part of the apparatus which manufactures the paper diaper 1, and may be provided separately from this manufacturing apparatus.

As shown in FIG. 3, in the perforating apparatus 50, the nonwoven fabric 100 is conveyed in a state where tension is applied. Specifically, the following rollers 51, 52, 53, 70 and the nonwoven fabric 100 are conveyed while being stretched between them.
The punching device 50 is provided with a punching roller 60. On the outer peripheral portion 61 of the perforating roller 60, a pin (a perforating member, a symbol is attached to only one location) 80 for perforating the nonwoven fabric 100 is provided. In addition, a roller 70 (hereinafter referred to as “opposing roller”) facing the punching roller 60 is provided.

  These rollers 60 and 70 are provided so that their axis centers are parallel to each other, and rotate in a predetermined direction (in FIG. 3, the perforating roller 60 has a counterclockwise rotation direction, and the opposing roller 70 has Example of clockwise rotation direction). Moreover, the rotational speed of each roller 60 and 70 is set so that the conveyance speed of the nonwoven fabric 100 and the displacement speed along the circumferential direction of the pin 80 may become equal.

In the punching device 50, the nonwoven fabric 100 is wound around the outer peripheral portion 71 of the counter roller 70 and conveyed. The pin 80 of the perforation roller 60 is pierced into the nonwoven fabric 100 thus conveyed, and the nonwoven fabric 100 is perforated.
The punching device 50 based on the above-described punching locations is roughly divided into a first transport unit 50A on the upstream side in the transport direction of the nonwoven fabric 100 and a second transport unit 50B on the downstream side in the transport direction. That is, the non-woven fabric 100 is carried (conveyed) toward the perforation roller 60 in the first conveyance unit 50A, and the non-woven fabric 100 is carried out (conveyance) from the perforation roller 60 in the second conveyance unit 50B.

The first transport unit 50A is provided with a feeding roller 53 through which the non-woven fabric 100 before punching is fed. The first transport unit 50 </ b> A is also provided with a first transport roller 51 that transports the nonwoven fabric 100 fed from the feed roller 53.
The second transport unit 50B is provided with a second transport roller 52 that transports the perforated nonwoven fabric 100. In addition, as an apparatus provided in the conveyance direction downstream side of the nonwoven fabric 100 from the 2nd conveyance roller 52, the winding roller (illustration omitted) which winds the punched nonwoven fabric 100, bonding and lamination | stacking of the punched nonwoven fabric 100 are carried out. Other apparatuses (not shown) that perform such processes in-line can be mentioned.

Subsequently, the perforation roller 60, the pin 80, and the opposing roller 70 will be described in detail.
A plurality of pins 80 are provided side by side along the circumferential direction on the outer peripheral portion 61 of the punching roller 60. Thus, by arranging the pins 80 in parallel, it is possible to make holes aligned in the transport direction with respect to the nonwoven fabric 100.

Although not shown, pins 80 are also provided side by side in the axial direction of the perforating roller 60. Specifically, the positions of the pins 80 (the circumferential positions of the pins 80) are different from each other when viewed in the axial direction of the punching roller 60.
With such staggered pins 80, holes aligned in the width direction of the nonwoven fabric 100 can be formed in addition to the holes aligned in the transport direction of the nonwoven fabric 100. Here, the “width direction” is a direction (parallel to the axial direction of the punching roller 60) that is orthogonal to the transport direction of the nonwoven fabric 100 and orthogonal to the thickness direction of the nonwoven fabric 100.
These pins 80 are all provided in the same shape. Therefore, in the following description, description will be given focusing on one pin 80.

As shown in FIG. 4, the pin 80 is roughly divided into three parts, ie, a distal end portion 81, an intermediate portion 82, and a base portion 83, from the distal end to the proximal end.
The distal end portion 81 and the intermediate portion 82 are portions that intersect the nonwoven fabric 100 when drilled in the axial direction. In the pin 80, the distal end portion 81 and the intermediate portion 82 are pierced into the nonwoven fabric 100 and perforated.
The base portion 83 is a portion that does not cross the nonwoven fabric 100 during drilling and serves as a base for the tip portion 81 and the intermediate portion 82.

The distal end portion 81 has a tapered shape that becomes thinner toward the piercing direction of the nonwoven fabric 100. Specifically, the tip 81 has a dot-like end (point) at the tip in the piercing direction. On the other hand, the intermediate part 82 has a taper smaller than that of the tip part 81 and has a substantially cylindrical shape. In addition, since the base part 83 is not a site | part which perforates the nonwoven fabric 100 directly, it can be made into desired shapes, such as a size cylinder shape and a taper shape.
In addition, the taper degree of each part 81, 82, 83 in the pin 80 may be set arbitrarily. For example, you may use the front-end | tip part 81 whose taper degree is smaller than the intermediate part 82. FIG. Alternatively, the base portion 83 as well as the intermediate portion 82 may be pierced into the nonwoven fabric 100. Thus, since the base part 83 having a punching function has a punching function in the same manner as the intermediate part 82, it can be said that the base part 83 is also used as the intermediate part 82. On the other hand, if the base part 83 is regarded as not being a part where the nonwoven fabric 100 is perforated, it can be said that the base part 83 is omitted.

Next, perforation of the nonwoven fabric 100 by the pins 80 will be described with reference to FIGS. 5 and 6.
In FIG. 5, the relative position of the pin 80 and the nonwoven fabric 100 is shown.
FIG. 5 shows a state in which the drilling of the pin 80 in the nonwoven fabric 100 proceeds from the right side to the left side, and the pin 80 is further extracted from the nonwoven fabric 100.
Specifically, in FIG. 5, the phase a shows that the pin 80 has started to pierce the non-woven fabric 100 in phase a, and the piercing of the pin 80 into the non-woven fabric 100 gradually increases in the order of phases b, c, d, and e. Shows progress. Phase e in FIG. 5 shows a state where the piercing of the pin 80 of the nonwoven fabric 100 is most advanced (a state where the piercing is completed). Moreover, a mode that the extraction | drawer of the pin 80 from the nonwoven fabric 100 advances gradually in order of the phase e, f, g, and h of FIG.

That is, the phase of the pin 80 (the pin 80 positioned immediately above the perforating roller 60 in FIG. 3) located at a position where the peripheral surfaces of the rollers 60 and 70 are closest to each other is set to “0 °”. Each phase when the rotation direction is a positive (plus) phase is shown in FIG. 5 (phases “a”, “b”, “c”, “d”, “e”, “f”, “ “g” and “h” satisfy the inequality “a>b>c>d> e” and the inequality “e <f <g <h”, where “a”, “b”, “c”, “d ”,“ E ”,“ f ”,“ g ”and“ h ”are all positive).
The pin 80 having a phase of “0 °” intersects a plane connecting the axis lines of the rollers 60 and 70.

In phases a to d, a hole is made while the pin 80 is pierced into the nonwoven fabric 100. A hole in which drilling is in progress is referred to as “piercing hole H _P ”. The Togeana H _P is a hole which is bored halfway piercing pin 80, is spread as piercing pin 80 progresses. Further, in phase e, the piercing of the pin 80 is completed. Such a Togeana H _P enlargement completes called "reaming H _R".
In the phases f to h, the pin 80 is extracted from the expanded hole H _R formed in the nonwoven fabric 100, and the size of the expanded hole H _R is not changed.

<Cross section of pin>
As shown in FIG. 6, the cross-section S of the front end portion 81 or intermediate portion 82 intersecting the Togeana H _P during drilling of the nonwoven fabric 100, the reaming H _R and concentric similar figures (here illustrate perfectly circular) Is provided. That, is designed shape of the pins 80 so that the center of the reaming H _R of the cross-section S coincide.
In FIG. 6, the puncture hole H _P corresponding to the phase b is indicated by the symbol “H _P1 ”, and the cross section S corresponding to the puncture hole H _P1 is indicated by the symbol “S ₁ ”. Similarly, the puncture hole H _P corresponding to the phase c is indicated by the symbol “H _P2 ”, the cross section S corresponding to the puncture hole H _P2 is indicated by the symbol “S ₂ ”, and the puncture hole H _P corresponding to the phase d is indicated by the symbol A cross section S indicated by “H _P3 ” and corresponding to the puncture hole H _P3 is indicated by “S ₃ ”. In addition, the expanded hole H _R corresponding to the phase e is directly indicated by the symbol “H _R ” and the cross section S corresponding to the expanded hole H _R is indicated by the symbol “S ₄ ”.

Since the shape of each cross section S of the pin 80 is designed as described above, as shown in FIG. 4, a line connecting the center of the cross section S in the piercing direction of the pin 80 with respect to the nonwoven fabric 100 (hereinafter abbreviated as “center line”). L _C is determined geometrically. Specifically, the center line L _C at the tip portion 81 of the pin 80 forms a cycloid curve in the radial cross section of the rollers 60 and 70. Specifically, the center line L _C draws an outer cycloid curve corresponding to the radial dimensions of the rollers 60 and 70.

In other words, each center of the cross-section S is arranged on the above-described cycloid curve, and is located on the downstream side in the rotation direction of the punch roller 60 toward the protruding direction of the pin 80. In other words, the front end side of the center line L _C is inclined toward the downstream side in the rotation direction of the perforation roller 60 with respect to the radial direction of the perforation roller 60.
Here, as shown in FIG. 6, a circular hole H _R is set, and a circular cross section S is illustrated. When the cross section S is circular, the tip 81 is not a rotating body-shaped cone centering on the axis extending in the radial direction of the perforating roller 60, but has a shape in which the tip of the cone is inclined downstream in the rotational direction. ing. However, reaming H _R is not limited to a perfect circle, may be set to another round like an ellipse or oval, it may be set to a polygon. In this case, the cross section S corresponding to Togeana H _P and which also becomes polygon, also form distorted pyramidal shape of the pin 80.

<Heat application part>
Furthermore, to enhance the shape stability Togeana H _P and reaming H _R, the pin 80 has a built-in heat application portion 90. That is, the heat application unit 90 has a function as a shape stabilizing part of the holes H _P and H _R. The heat application unit 90 conducts and applies heat to at least one of the tip portion 81 and the intermediate portion 82.
Here, bored a Togeana H _P mainly in the distal end portion 81 of the pin 80, mainly to stabilize the shape of the reamed H _R or Togeana H _P in the middle portion 82, heat from the heat application portion 90 Applied only to the intermediate portion 82. However, the heat from the heat application unit 90 may be applied only to the distal end portion 81, or may be applied to both the distal end portion 81 and the intermediate portion 82.
In addition, the heat application unit 90 is not limited to at least one of the tip portion 81 and the intermediate portion 82, and may apply heat to the base portion 83. For example, the heat application unit 90 may apply heat to the entire pin 80. Thus, as the heat application part 90 which heats the pin 80 entirely, the heat-transfer member (for example, ring-shaped member) in which the some pin 80 was protruded can be used.

Further, a supply unit 91 that supplies energy for generating heat to the heat application unit 90 is provided. The supply unit 91 may be provided inside the punching roller 60 or may be provided outside the punching roller 60.
As the heat application unit 90, a known electric heater such as a ceramic heater or a PTC (Positive Temperature Coefficient) heater can be used. In this case, as the supply unit 91, one that supplies electric energy (electric power) is used. However, a known heat transfer material such as a copper material or an aluminum material may be used as the heat application unit 90. In this case, a heat transfer member that supplies thermal energy is used for the supply unit 91.

<Interval holder>
In the phases f to h shown in FIG. 5, the tip 81 of the pin 80 is extracted from the nonwoven fabric 100. At the time of this extraction, a portion of the tip 81 that is particularly downstream in the rotation direction of the perforating roller 60 (left side in FIG. 5) is close to the nonwoven fabric 100 and is caught by the nonwoven fabric 100 if no structural measures are taken ( There is a risk of interference).
Therefore, in the pin 80 of the present embodiment, as shown in FIG. 4, an interval holding portion 81 a that is positioned at a distance from the nonwoven fabric 100 at a portion of the distal end portion 81 on the downstream side in the rotation direction of the punching roller 60. Is provided structurally. The interval holding portion 81a has a shape (that is, a claw shape) in which the portion of the front end portion 81 on the downstream side in the rotation direction of the punching roller 60 is removed from the downstream side in the rotation direction.

More specifically, in the pin 80, the upstream portion in the rotational direction is bulged toward the upstream side, whereas the downstream portion in the rotational direction is provided in a concave shape toward the upstream side. also in the pin 80 having such a shape, the cross section S mentioned above is formed into a reamed H _R concentric similar figure.
Even if each cross-section described above is a pin having a similar shape concentric with the enlarged hole, there is a pin having a shape in which a portion on the downstream side in the rotation direction swells. Compared with such a pin, the pin 80 of the present embodiment is recessed on the downstream side in the rotation direction, and the center line L _C is slightly shifted to the upstream side in the rotation direction.

<Engagement part>
In addition, since the pin 80 is pierced into the nonwoven fabric 100, the outer peripheral portion 71 of the facing roller 70 is provided with a structure that allows the pin 80 protruding toward the inner diameter side of the facing roller 70 with respect to the nonwoven fabric 100.
Here, an engaging portion (allowing portion) 710 that allows the pin 80 to protrude so as to engage with the pin 80 is provided.

  The engaging portion 710 is provided on the outer peripheral portion 71 of the facing roller 70 corresponding to each of the pins 80. The engaging portion 710 is recessed so as to surround the pin 80 protruding from the nonwoven fabric 100 toward the inner diameter side of the facing roller 70. The recessed space of the engaging portion 710 may be filled with a member (for example, sponge or gel) that allows the pin 80 to be inserted and removed and supports the nonwoven fabric 100 from the inner diameter side of the facing roller 70. .

<Pin variations>
In addition to the pin 80 described above, pins 80 ′ and 80 ″ illustrated below may be used.
For example, as shown in FIG. 7, a pin 80 ′ having a tip portion 81 ′ having a greater taper degree (degree of narrowing toward the piercing direction) than the tip portion 81 of the pin 80 described above may be used. In the pin 80 ', the taper degree of the intermediate portion 82' (or the proximal end side of the distal end portion 81 ') is suppressed.
Therefore, the dimension (length in the protruding direction) of the pin 80 ′ that contacts (slides) the non-woven fabric 100 that defines the outline of the puncture hole H _P or the expanded hole H _R (see FIG. 6) that has been almost completed is ensured. Is done. For this reason, it is particularly preferable that the pin 80 'incorporates the heat application unit 90 to which the supply unit 91 is connected as described above.

  In addition, as shown in FIG. 8, a pin 80 ″ having a tip portion 81 ″ having a smaller taper degree than the tip portion 81 of the pin 80 described above may be used. In this case, the tip portion 81 ″ or the intermediate portion 82 ″ sharper than the above-described tip portion 81 or the intermediate portion 82 is provided on the pin 80 ″. Therefore, the tip portion 81 ″ and the intermediate portion 82 ″ are further provided. It becomes easy to pierce and improves perforation.

[2. Action and effect]
Since the disposable diaper 1 and the punching device 50 are configured as described above, the following operations and effects can be obtained.
Hereinafter, after describing the operation and effect relating to the punching device 50, the operation and effect relating to the disposable diaper 1 will be described.

[2-1. Drilling device]
(1) If a rotating body-shaped pin centered on the axis extending in the radial direction of the punching roller 60 is used, as shown in FIG. 9, the center C of the piercing holes H _PP1 , H _PP2 , H _{PP3 P1,} C _P2, and C _P3 and reaming H _R center C _R of the eccentrically. Therefore, it is impossible to uniformly expanded toward the Togeana H _P in the radial direction, there is a risk that the reaming H _R is distorted shape, also lead to tearing of the nonwoven fabric. Therefore, there is a possibility that the perforation property is lowered.
In the pin 80 with respect to this cross-section S of the front end portion 81 or intermediate portion 82 intersecting the Togeana H _P during drilling of the nonwoven fabric 100 is provided in the similar shape of the reaming H _R concentric. Therefore, it is possible to evenly expanded (enlarged) toward the Togeana H _P in the radial direction. Therefore, it is possible to drilled the reaming H _R that ordered shape, it is also possible to suppress the tear of the nonwoven fabric 100. Therefore, the perforation property to the nonwoven fabric 100 can be improved.

When the pin 80 is displaced in the circumferential direction of the punching roller 60 and the nonwoven fabric 100 is conveyed in the circumferential direction of the opposing roller 70, the center line L _C has a cycloid curve. Will be placed on top. Further, the center of the cross section S is located on the downstream side in the rotation direction of the punching roller 60 as it goes in the protruding direction of the pin 80.
In other words, according to the tip portion 81 in which the center line L _C is arranged on the cycloid curve, the pin 80 is displaced in the circumferential direction of the punching roller 60 and the nonwoven fabric 100 is conveyed in the circumferential direction of the facing roller 70. If, section S is similar shapes of reaming H _R concentric. Therefore, it is possible to evenly expanded (enlarged) toward the Togeana H _P in the radial direction.

(2) If a pin having a cutter-like portion with the cutting edge directed in the rotation direction of the perforating roller 60 is used, the nonwoven fabric 100 pierced by this pin is cut and applied to the nonwoven fabric 100. The tension is reduced. Even if the tension of the non-woven fabric 100 is maintained, there is a possibility that the notch is enlarged by this tension. Therefore, the perforation property to the nonwoven fabric 100 falls.
On the other hand, the front end portion 81 of the pin 80 has a tapered shape that becomes thinner toward the piercing direction of the nonwoven fabric 100. Therefore, the nonwoven fabric 100 can be pierced and perforated while suppressing a decrease in tension of the nonwoven fabric 100 being conveyed. Also from this point, the piercing property to the nonwoven fabric 100 can be improved.

(3) Furthermore, a heat application unit 90 and a supply unit 91 that supplies energy for generating heat to the heat application unit 90 are provided. Therefore, it is possible to fix the entangling state of the thermoplastic resin nonwoven fabric 100 in the portion corresponding to the contour of Togeana H _P and reaming H _R by thermally melting, Togeana H _P and reaming H _R It is possible to suppress the disturbance and fraying of the contour shape.
In addition, since the heat application unit 90 applies heat to at least one of the tip portion 81 and the intermediate portion 82, a decrease in energy efficiency can be suppressed. This also contributes to improving the controllability of thermal energy transmitted to the nonwoven fabric 100.
In addition, when the heat application unit 90 that heats the pins 80 as a whole is used, the non-woven fabric 100 can be reliably melted by heat at all locations in contact with the pins 80.
Also from these points, the piercing property to the nonwoven fabric 100 can be improved.

(4) Further, since the taper degree of the intermediate portion 82 is smaller than the tip portion 81, to secure the slide dimensions for nonwoven 100 forming the outline of the reaming H _R (or Togeana H _P perforation is almost completed) It is possible to secure a time for applying heat to the contour. Therefore, it contributes to reliably suppressed turbulence and fraying contour of Togeana H _P and reaming H _R.
Alternatively, when the tip part 81 having a taper degree smaller than that of the intermediate part 82 is used, the tip part 81 is thicker than the structure having the opposite taper degree, so that the strength of the tip part 81 is improved. The durability of the pin 80 can be increased.
(5) In addition, a claw-shaped interval holding portion 81 a located at a distance from the nonwoven fabric 100 is structurally provided in a portion of the distal end portion 81 on the downstream side in the rotation direction of the punching roller 60. Therefore, it is possible to suppress the contact of the pin 80 to a site forming the contour and around the reaming H _R of the nonwoven fabric 100. Therefore, it is possible to suppress the tear of the nonwoven fabric 100 in the shape of a disturbance or reaming H _R around the reaming H _R.
Also from this point, the piercing property to the nonwoven fabric 100 can be improved.

(6) Since the punching device 50 is provided with the conveyance units 50A and 50B for carrying the nonwoven fabric 100 in and out of the punching roller 60, the nonwoven fabric 100 to be punched can be automatically conveyed. Therefore, the perforation efficiency for the nonwoven fabric 100 can be improved.
(7) Further, the pin 80 protruding to the inner diameter side of the facing roller 70 with respect to the nonwoven fabric 100 can be structurally permitted by the engaging portion 710, and the nonwoven fabric 100 is allowed to be pin 80 under such an allowable structure. Can be perforated.

[2-2. Paper diaper]
Next, actions and effects relating to the disposable diaper 1 will be described.
(1) Since the nonwoven fabric 100 in which the vent hole H is perforated by the perforating apparatus 50 described above is used as the cover sheet 14 in the paper diaper 1, the air permeability in the mounted state can be improved.

(2) Moreover, in the extension location of the pressing part 40, the absorber 10 and the center sheet | seat 11 and also the paper diaper 1 become easy to bend in addition to this, and can improve the fitting property of the paper diaper 1 with respect to a wearer. .
The part by which the groove-shaped pressing part 40 was shape | molded among the absorber 10 and the center sheet | seat 11 can also be made non-contact with respect to a wearer's skin surface. Therefore, the air permeability in a mounting state can be improved and the stuffiness inside the disposable diaper 1 can be suppressed. By making part of the center sheet 11 non-contact with the wearer's skin surface by the compressed portion 40, the touch (tactile sensation) can be enhanced.

  Since this pressing part 40 extends across both the longitudinal direction and the width direction, for example, the liquid excreted by capillary action can be diffused along the pressing part 40. Therefore, the diffusibility of the liquid excreted in both the longitudinal direction and the width direction can be improved, and the water absorption points of the absorbent body 10 can be dispersed. Therefore, the water absorption of the absorber 10 can be ensured.

Furthermore, according to the inclination parts 41 and 42 which incline in a mutually different direction in the pressing part 40, the pressing part 40 makes the lattice shape along two directions. From this, it is possible to further improve the fit to the wearer, the ventilation in the wearing state, and the diffusibility of the excreted liquid by aerating in two directions inside the disposable diaper 1.
In addition, since the vent region H is provided in the region where the extension region of the compressed portion 40 is virtually extended in the longitudinal direction, the steamed air passing through the compressed portion 40 is smoothly discharged from the vent hole H. can do. That is, the squeezing part 40 and the vent hole H cooperate to efficiently suppress the stuffiness inside the disposable diaper 1.

[II. Others]
Finally, other modifications will be described.
Hereinafter, modifications related to the punching apparatus will be described, and then modifications related to the disposable diaper will be described.
<Modification of drilling device>
For example, the non-woven fabric or the pin may be pierced by being pierced by the non-woven fabric while the pin is displaced in the circumferential direction. Even in this case, if the center of each of the cross sections mentioned above is located on the downstream side in the rotation direction of the punching roller as it goes in the protruding direction of the pin, the hole to be drilled can be uniformly expanded in the radial direction. It is possible to improve the piercing property to the nonwoven fabric.

Moreover, if a space | interval holding | maintenance part is a shape located at intervals with respect to a nonwoven fabric at the time of pin extraction, various shapes other than a claw shape can be employ | adopted.
In addition, the taper degree of the tip portion and the intermediate portion may be similar. In this case, the manufacturing cost of the pin can be suppressed.

<Modified example of paper diaper>
Although a pressing part suppresses steaming efficiently in cooperation with the vent hole H mentioned above, although it is preferable to be provided in a paper diaper, it is not an essential structure. This pressing part should just be provided in the absorber at least, and does not need to be provided in the center sheet | seat. In this case, before a center sheet is laminated | stacked, a part of absorber is squeezed from the skin surface side, and a pressing part is shape | molded.
Or a pressing part may be shape | molded by the non-skin surface side of an absorber. In this case, at least the absorber is squeezed from the non-skin surface side, and the squeezed part is formed. For example, the pressing part is formed by pressing the absorber together with the back sheet from the non-skin side.

  Moreover, as a planar view shape of a pressing part, not only a grid | lattice shape but various shapes are employable. As a specific example, at least one of the first inclined portion or the second inclined portion may be singular or at least one of them may be omitted. Furthermore, the first inclined portion or the second inclined portion may be a curved shape, a triangular wave shape, or a rectangular wave shape in addition to a linear shape. As described above, the compressed portions having other planar shapes contribute to improving the wearer's comfort by ensuring fit, breathability and water absorption. Or a pressing part is not restricted to what extends, You may be provided in dot shape. Even in this case, it can contribute to improvement of fit and the like.

  In addition, the vent hole is not limited to the cover sheet or the perforated region described above, and may be perforated in another sheet or region. Also in this case, the air permeability in the mounted state can be improved.

1 disposable diaper (absorbent article)
DESCRIPTION OF SYMBOLS 10 Absorber 11 Center sheet 12 Back sheet 13 Side sheet 14 Cover sheet 141 First cover sheet 142 Second cover sheet 143 Third cover sheet 15 Gather 19 Indicator 20 Yarn rubber (elastic member)
40 Pressing part (concave part)
41 First Inclined Section 42 Second Inclined Section 50 Punching Device 50A First Conveying Section 50B Second Conveying Section 51 First Conveying Roller 52 Second Conveying Roller 53 Feeding Roller 60 Perforating Roller 61 Outer Perimeter 70 Opposing Roller 71 Outer Perimeter 710 Engagement Joint 80 pins (perforated member)
81 tip 81a interval holding unit 82 the intermediate portion 83 the base portion 90 heat application portion 91 supplying unit 100 nonwoven C _R reaming H _R center H _{P of, H P1, H P2, H} P3 Togeana H _R reaming L _C Pin 80 center lines S, S ₁ , S ₂ , S ₃ , S ₄ cross sections

Claims (14)

A tip that pierces a thermoplastic non-woven fabric to gradually widen the puncture hole,
An intermediate portion disposed on the proximal end side with respect to the distal end portion;
A piercing member comprising: a heat applying part that applies heat to at least one of the tip part and the intermediate part. A base portion disposed on the base end side with respect to the intermediate portion,
The piercing member according to claim 1, wherein the heat application unit applies heat to the base unit. 3. The tip according to claim 1 or 2, wherein a cross section that intersects each of the piercing holes that are gradually expanded is provided in a similar shape concentric with the expanded hole, and a center of each of the cross sections is disposed on a cycloid curve. The described piercing member. The piercing member according to any one of claims 1 to 3, wherein the tip portion has a tapered shape that becomes thinner toward a piercing direction. The piercing member according to claim 4, wherein the intermediate portion has a smaller taper degree than the tip portion. The piercing member according to claim 4, wherein the intermediate portion has a greater degree of taper than the tip portion. A perforation roller comprising the perforation member according to any one of claims 1 to 6 on an outer peripheral portion and rotating in a predetermined direction,
A perforating roller provided with a supply unit that supplies energy for generating heat to the heat application unit. The perforation roller according to claim 7, wherein the center of each of the cross sections is located on the downstream side in the rotation direction as it goes in the piercing direction. The distal end portion has an interval holding portion positioned at a distance from the non-woven fabric in which the expanded hole is formed when the punching member is extracted from the expanded hole on the downstream side in the rotation direction. Item 9. The punching roller according to Item 7 or 8. The perforating roller according to claim 9, wherein the interval holding portion has a claw shape. A punching device comprising the punching roller according to any one of claims 7 to 10,
A first transport unit for transporting the nonwoven fabric to the perforation roller;
A punching device comprising: a second transport unit that transports the nonwoven fabric from the punching roller. A counter roller facing the perforating roller;
The perforating apparatus according to claim 11, wherein the facing roller has a permissible portion that allows the perforating member that is pierced with respect to the nonwoven fabric to protrude. An absorbent article comprising the nonwoven fabric perforated by the perforation apparatus according to claim 11 or 12. The absorbent article according to claim 13, wherein the water-absorbing mat-like absorbent body is recessed in the thickness direction, and has a lattice-shaped recess when viewed from the thickness direction.

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