WO2019224987A1

WO2019224987A1 - Absorbent body and absorbent article

Info

Publication number: WO2019224987A1
Application number: PCT/JP2018/020063
Authority: WO
Inventors: 真悟永田; 慧子小林; 雅人重松
Original assignee: 株式会社ダイセル
Priority date: 2018-05-24
Filing date: 2018-05-24
Publication date: 2019-11-28
Also published as: CN111989073A; JPWO2019224987A1

Abstract

This absorbent body is provided with: a first sheet comprising a non-woven fabric; a second sheet disposed overlapping the first sheet and comprising a non-woven fabric; a core body disposed between the first sheet and the second sheet; and absorbent particulates dispersedly disposed between the first sheet and the core body, and between the second sheet and the core body. The core body comprises a tow band in which long fibers of cellulose acetate tow are crimped and opened.

Description

Absorber and absorbent article

The present invention relates to an absorbent body and an absorbent article.

The following defined terms are used in this document.
TD: Total fiber degree (total denier), which refers to the fiber degree (grams per 9000 m) of a tow aggregate (tow band).

FD: Single fiber degree (filament denier), which refers to the fiber degree (grams per 9000 m) of a single fiber (one filament). Also referred to as single fiber denier.

Absorbent articles that are sanitary products such as paper diapers and urine leakage prevention pads include, for example, an absorbent that absorbs moisture, a top sheet having liquid permeability, and a back sheet having air permeability.

The absorber has, for example, a pair of outer nonwoven fabrics made of fluff pulp and the like and a core body disposed between the pair of outer nonwoven fabrics as disclosed in

Patent Document

1 or 2. The core body is made of, for example, a relatively low density inner nonwoven fabric formed by combining short fibers in a mesh shape. Between the pair of outer non-woven fabrics and the core body, for example, water-absorbing granular materials made of a highly water-absorbing resin (SAP: Super absorbent polymer) are arranged in a dispersed manner. In an absorbent article provided with an absorbent body having such a structure, moisture reaches the absorbent body through fine holes formed in the top sheet. Within the absorbent body, moisture is diffused by the pair of outer nonwoven fabric and inner nonwoven fabric and absorbed by the particulate matter.

Chinese Patent No. 10149472B Chinese Utility Model No. CN206007482U

It is desirable that the absorbent article has good tactile sensation during use and is bulky. However, in the case of the absorbent article having the above-described structure, the moisture after water absorption may permeate into the surface of the absorbent article (hereinafter referred to as “rewetting”), which may reduce the tactile sensation. Moreover, the thickness is relatively thin and the wearing feeling is not excellent, and the feeling of security given to the user is not sufficient.

Therefore, an object of the present invention is to make it possible to maintain a bulky state with a good tactile sensation during use in an absorbent article including an absorbent body in which water-absorbing granular materials are dispersedly arranged.

In order to solve the above-described problem, an absorbent body according to an aspect of the present invention includes a first sheet made of a nonwoven fabric, a second sheet made of a nonwoven fabric, arranged to overlap the first sheet, and the first sheet. The core body disposed between the second sheet, the water absorbent disposed between the first sheet and the core body, and dispersed between the second sheet and the core body. And the core body comprises a tow band obtained by crimping and opening long fibers of cellulose acetate tow.

According to the above configuration, the core body is composed of a tow band obtained by crimping and opening cellulose acetate tow long fibers, so that the water absorbed by the absorbent body passes through the abundant fiber gaps formed in the core body. Can be satisfactorily passed through, and water can be efficiently absorbed into the granular material located on both the first sheet side and the second sheet side of the core body. Thereby, it can prevent that a water | moisture content remains around a granular material, and can prevent rewetting.

In addition, since the core body has a good bulkiness by crimping and opening the long fibers of cellulose acetate tow, even if the absorbent body is compressed during use or the absorbent body absorbs water, The bulk of the absorbent body can be prevented from greatly decreasing, and a soft and soft feel and cushioning properties can be exhibited. Moreover, since the thickness of the absorber can be increased, an excellent wearing feeling can be obtained, and a sufficient sense of security can be given to the user.

The core body may have a sheet shape, and may be disposed so as to overlap the first sheet and the second sheet. Thus, by making the core body into a sheet shape, excellent tactile sensation can be obtained over a wide area of the absorbent body even during use due to the good bulkiness of the core body.

The basis weight of the tow band in the core body may be set to a value in a range of 15 gsm (grams per square meter) to 150 gsm. Thereby, the compression energy of a core body can be raised and favorable bulkiness and soft soft touch can be made to exhibit more favorably to an absorber.

Moreover, the absorbent article which concerns on 1 aspect of this invention is a back sheet | seat arrange | positioned on the opposite side to the said core body of the said 1st sheet | seat, and the said 2nd sheet | seat of said 1st sheet | seat. And a top sheet disposed on the opposite side of the core body.

According to the above configuration, by using an absorbent body composed of a tow band obtained by crimping and opening long fibers of cellulose acetate tow, the absorbent article can prevent rewetting and greatly increase the bulk of the absorbent body in use. Can be prevented.

According to each aspect of the present invention, in an absorbent article including an absorbent body in which water-absorbing particulates are dispersed and arranged, the feel during use is good and a bulky state can be maintained.

It is the schematic of the absorber manufacturing apparatus which concerns on embodiment. It is the vertical sectional view seen from the conveyance direction of the absorber obtained by the apparatus of FIG. It is a vertical sectional view of an absorptive article provided with the absorber of Drawing 2. It is the vertical sectional view seen from the conveyance direction of the absorber of a comparative example.

Hereinafter, embodiments will be described with reference to the drawings. The upstream side mentioned below refers to the upstream side in the conveyance direction P of the toe band 40, and the downstream side refers to the downstream side in the conveyance direction P of the toe band 40.

(Embodiment)
[Absorber manufacturing equipment]

FIG. 1 is a schematic view of an absorbent body manufacturing apparatus 1 (hereinafter simply referred to as manufacturing apparatus 1) according to an embodiment. As shown in FIG. 1, a packing container 50 is disposed in the vicinity of the manufacturing apparatus 1. In the packing container 50, a tow band 40 including a plurality of fibers is folded in a bale shape and compressed and packed. The packaging container 50 of FIG. 1 has a cross-sectional structure.

The fibers contained in the tow band 40 are crimped cellulose acetate tow long fibers. The TD of the toe band 40 can be set as appropriate, but is set to a value in the range of 6000 to 60000 as an example. The FD of the toe band 40 can be set as appropriate, but is set to a value in the range of 1 to 20 as an example. In the manufacturing apparatus 1 of this embodiment, the toe band 40 is transported in a predetermined transport direction P while the width direction is kept horizontal. As an example, the TD and basis weight of the toe band 40 can be adjusted by cutting the tow band 40 being conveyed into a predetermined width dimension as disclosed in Japanese Patent Application Laid-Open No. 2014-221961.

The manufacturing apparatus 1 includes a first manufacturing unit 2 and a second manufacturing unit 3. The first manufacturing unit 2 includes a first widening device 4, a guide 5, a second widening device 6, a first opening roll pair 7, a second opening roll pair 8, a opening apparatus 9, and a transport roll pair 10. .

The first widening device 4 widens the tow band 40 lifted from the inside of the packing container 50 in the width direction. The guide 5 guides the tow band 40 that has passed through the first widening device 4 toward the second widening device 6. The second widening device 6 widens the tow band 40 that has passed through the guide 5 in the width direction. As an example, the first widening device 4 and the second widening device 6 have the same configuration.

The first opening roll pair 7 and the second opening roll pair 8 further open the tow band 40 that has passed through the second widening device 6 on the upstream side of the opening device 9. The second spread roll pair 8 is disposed on the downstream side of the first spread roll pair 7. The first fiber opening roll pair 7 has a pair of

rolls

14 and 15 arranged with their peripheral surfaces facing each other. The second fiber opening roll pair 8 has a pair of

rolls

16 and 17 arranged with their peripheral surfaces facing each other. The

rolls

16 and 17 rotate at a peripheral speed faster than the peripheral speed of the

rolls

14 and 15.

The tow band 40 that has passed through the second widening device 6 is inserted between the pair of

rolls

14 and 15 and between the pair of

rolls

16 and 17. The tow band 40 is applied with tension in the transport direction P by coming into contact with the peripheral surfaces of the rolls 14 to 17, and is opened in a bulky manner.

The opening device 9 opens the tow band 40 that has passed through the second opening roll pair 8. The method for opening the tow band 40 in the opening device 9 is not limited. The transport roll pair 10 includes transport rolls 23 and 24 that are arranged with their peripheral surfaces facing each other. The tow band 40 that has passed through the spreader 9 is inserted between the transport rolls 23 and 24 and is pressed in the thickness direction by the transport rolls 23 and 24. Thereby, the sheet-like core body 41 is manufactured. The core body 41 is conveyed to the second manufacturing unit 3 while being guided by the guide roll 13.

The second manufacturing unit 3 arranges the first sheet 42 and the second sheet 43 on the core body 41 with the granular material 45 interposed therebetween. The second manufacturing unit 3 includes a first supply device 11, a sheet conveyance device 25, a second supply device 12, an adhesion device 29,

addition devices

30 and 31, sheet forming roll pairs 32 and 33, and a sticking device 34. .

The first supply device 11 feeds the belt-shaped first sheet 42 from the first sheet roll R1 and supplies it on the transport line L. The sheet conveyance device 25 conveys the first sheet 42 supplied from the first supply device 11 to the conveyance line L. The adding device 30 adds the particulate matter 45 onto the first sheet 42 in the transport line L. A surface of the first sheet 42 that contacts the granular material 45 is coated with a binder, and the granular material 45 is fixed to the first sheet 42 by the binder. The core body 41 is supplied to the first sheet 42 to which the granular material 45 is added.

The first sheet 42, the granular material 45, and the core body 41 are passed between the

rolls

26 and 27 in the sheet molding roll pair 32. A granular material 45 is further added onto the core body 41 by the adding device 31.

The second supply device 12 feeds the strip-shaped second sheet 43 from the second sheet roll R <b> 2, and sandwiches the core body 41 and the granular material 45 between the first sheet 42 and the second sheet 43. The sheet 43 is supplied onto the conveyance line L. The surface of the second sheet 43 that comes into contact with the granular material 45 is coated with a binder as with the first sheet 42, and the granular material 45 is fixed to the second sheet 43 by this binder.

Here, the 1st sheet | seat 42 and the 2nd sheet | seat 43 consist of a nonwoven fabric which has air permeability and liquid permeability. At least one (here, both) of the first sheet 42 and the second sheet 43 has a network structure formed by combining short fibers. This short fiber consists of a synthetic fiber as an example.

The first sheet 42, the granular material 45, the core body 41, and the second sheet 43 are passed between the rolls 37 and 38 in the sheet molding roll pair 33. The bonding apparatus 29 attaches an adhesive to the second sheet 43 between the second sheet roll R2 and the sheet forming roll pair 33.

The adhering device 34 presses the first sheet 42 and the second sheet 43 in the thickness direction, and bonds the first sheet 42 and the second sheet 43 with the core body 41 and the granular material 45 sandwiched therebetween. Adhere with an agent. In the manufacturing apparatus 1, the absorbent body 44 is manufactured by cutting the first sheet 42, the core body 41, and the second sheet 43 that have passed through the sticking apparatus 34 into predetermined dimensions.

[Absorber and absorbent article]
FIG. 2 is a vertical sectional view of the absorbent body 44 obtained from the manufacturing apparatus 1 of FIG. As shown in FIG. 2, the absorbent body 44 includes a first sheet 42, a second sheet 43, a core body 41, and a granular material 45.

The 1st sheet | seat 42 and the 2nd sheet | seat 43 consist of the same nonwoven fabric as an example. The second sheet 43 is disposed so as to overlap the first sheet 42. The core body 41 is disposed between the first sheet 42 and the second sheet 43.

The core body 41 has a sheet shape and is disposed so as to overlap the first sheet 42 and the second sheet 43. The core body 41 includes a tow band 40 obtained by crimping and opening long fibers of cellulose acetate tow. The granular material 45 is distributed and arranged between the first sheet 42 and the core body 41 and between the second sheet 43 and the core body 41.

FIG. 3 is a vertical sectional view of an absorbent article 46 including the absorbent body 44 of FIG. As shown in FIG. 3, the absorbent article 46 includes an absorbent body 44, a top sheet 47, and a back sheet 48. The back sheet 48 has air permeability and is disposed on the opposite side of the first sheet 42 from the core body 41. The top sheet 47 has air permeability and liquid permeability, and is arranged on the opposite side of the second sheet 43 from the core body 41.

The basis weight of the toe band 40 in the core body 41 can be appropriately set according to, for example, each thickness dimension of the absorbent body 44 and the absorbent article 46 to be manufactured, but in the present embodiment, 15 gsm or more and 150 gsm or less as an example. Is set to a value in the range. For example, the basis weight is more preferably a value in the range of 30 gsm to 110 gsm, and still more preferably a value in the range of 40 gsm to 170 gsm.

Thus, according to the absorbent body 44, the core body 41 is composed of the tow band 40 obtained by crimping and opening the long fibers of cellulose acetate tow, so that moisture absorbed in the absorbent body 44 is formed in the core body 41. The inside of the core body 41 can be satisfactorily passed through the abundant fiber gaps formed, and the particulate matter 45 located on both the first sheet 42 side and the second sheet 43 side of the core body 41 can be efficiently absorbed. Thereby, it is possible to prevent moisture from remaining around the granular material 45 and to prevent rewetting.

Further, since the core body 41 has an excellent bulkiness due to crimping and opening of the long fibers of cellulose acetate tow, the absorbent body 44 is compressed during use or the absorbent body 44 absorbs water. However, it is possible to prevent the bulk of the absorbent body 44 from being significantly reduced, and to exhibit a soft and soft feel and good cushioning properties. Moreover, since the thickness of the absorber 44 can be enlarged, an excellent wearing feeling can be obtained and a sufficient sense of security can be given to the user.

Since the core body 41 has a network structure formed by entanglement of long fibers of cellulose acetate tow, for example, the fibers need not be fused together or the fibers cannot be bonded with an adhesive. Can also form a network structure. For this reason, the core body 41 is rich in fiber gaps and has excellent liquid diffusibility. Moreover, the core body 41 is also comprised by the cellulose acetate tow, and also has the outstanding hydrophilic property. Moreover, since the core body 41 is shape | molded by allowing the tow band 40 to pass through the fiber-opening device 9, it can be shape | molded, without making fibers fuse | melt or couple | bond together.

Further, in the absorbent body 44, the granular material 45 is supported by the first sheet 42 between the core body 41 and the first sheet 42, and supported by the core body 41 between the core body 41 and the second sheet 43. Has been. For this reason, for example, it is not necessary to support the granular material 45 in the fiber gap formed by fusing or bonding the fibers of the core body 41. Moreover, since it is not necessary to fix the fiber gap of the core body 41 in this way, the good tactile sensation and bulkiness of the core body 41 can be maintained.

Moreover, since the core body 41 is a sheet-like shape and is disposed so as to overlap the first sheet 42 and the second sheet 43, the core body 41 is excellent in bulk and is excellent over a wide area of the absorber 44 even during use. A tactile feel can be obtained.

Further, at least one of the first sheet 42 and the second sheet 43 has a network structure formed by combining short fibers. In this way, by configuring at least one of the first sheet 42 and the second sheet 43 to have the network structure, moisture can be quickly circulated into the absorbent body 44, and the particulate matter 45 can absorb water evenly. Can be made easier.

Moreover, since the basis weight of the toe band 40 in the core body 41 is set to a value in the range of 15 gsm or more and 150 gsm or less, the compression energy of the core body 41 can be increased, and the absorbent body 44 has a good bulkiness, A soft and soft tactile sensation can be exhibited even better. Here, the compression energy refers to energy absorbed per 1 cm ² of the surface during compression. It can be evaluated that the larger the value of the compression energy, the easier the compression and the softer it is.

In addition, the absorbent article 46 is stacked on the opposite side of the absorbent body 44, the back sheet 48 arranged to be opposite to the core body 41 of the first sheet 42, and the core body 41 of the second sheet 43. And a top sheet 47 arranged. As described above, by using the absorbent body 44 made of the tow band 40 obtained by crimping and opening cellulose acetate tow long fibers, rewetting can be prevented and the bulk of the absorbent body 44 in use is greatly reduced. Can be prevented. The core body 41 may have a fiber network structure by dissolving the fibers with a binder such as triacetin.

(Confirmation test)
Next, although a confirmation test is demonstrated, this invention is not limited to the Example shown below. The absorber 44 which concerns on an Example was manufactured using the manufacturing apparatus 1 described in embodiment. As a core body, except that a nonwoven fabric having a network structure formed by welding short fibers having a double structure having a core material made of PE (polyethylene) and a coating material made of PET (polyethylene terephthalate), The absorber which concerns on a comparative example was manufactured on the manufacturing conditions similar to an Example.

Here, FIG. 4 is a vertical sectional view as seen from the conveying direction of the absorber 144 of the comparative example. The non-woven fabric which is the core body 141 in the absorbent body 144 is lower in density than the first sheet 42 and the second sheet 43 and has the same density as the core body 41 in the absorbent body 44 of the embodiment. Set. About the absorber 44 of an Example and the absorber 144 of a comparative example, the water absorption speed | rate, the rewet amount, and the compression energy were evaluated in the following procedures.

[Water absorption speed]
The

absorbers

44 and 144 are arranged in a U shape in a top view, and 80 cc of physiological saline is dropped on the

absorbers

44 and 144 in a state where a constant load (5 kg) is applied to the

absorbers

44 and 144. At this time, the time required for the

absorbers

44 and 144 to completely absorb water was measured as the water absorption rate at the first water absorption. In addition, after measuring the rewetting amount described later, a second 80 cc of physiological saline is dropped on the

absorbers

44 and 144, and the time required for the

absorbers

44 and 144 to completely absorb water is measured for the second time. It was measured as the rate of water absorption.

[Rewet amount]
When measuring the water absorption rate at the time of the first water absorption, after 5 minutes have passed since physiological saline was dropped, filter paper and a weight of a predetermined weight (3.5 kg) were placed on the

absorbers

44 and 144 in 3 minutes. The weight of the liquid absorbed by the filter paper was measured as the first rewet amount. Further, after measuring the weight of the liquid and dropping the second physiological saline when measuring the water absorption rate, the second rewetting amount is measured by the same method as the first rewetting amount measuring method. did.

[Compression energy]
The compressive energy of the

absorbers

44 and 144 of the comparative example and the example was measured using a touch measuring device “KES-G5” manufactured by Kato Tech Co., Ltd. In the measurement, the

absorbers

44 and 144 were applied from the surface in the thickness direction to the upper limit load at a constant speed under the setting conditions of a compression deformation rate of 0.1 mm / sec, an upper limit load of 50 g / cm ² and a pressure plate area of 2 cm ^2. The plate was compressed and deformed by a pressure plate. The value measured at this time was defined as compression energy. The measurement results are shown in Table 1.

As shown in Table 1, it was confirmed that the absorbent body 44 of the example can maintain the first and second water absorption rates in substantially the same manner as the absorbent body 144 of the comparative example. In addition, it was found that the absorbent body 44 of the example can maintain the first rewetting amount substantially the same as the absorbent body 144 of the comparative example, and can suppress the second rewetting amount more than the absorbent body 144 of the comparative example. Moreover, it turned out that the absorber 44 of an Example has significantly large compression energy compared with the absorber 144 of a comparative example.

Moreover, when the external appearance of the absorber 44 of the example and the absorber 144 of the comparative example is visually observed, the thickness of the absorber 144 of the comparative example is conspicuous compared to the absorber 44 of the example, It has been found that the absorbent body 44 of the example is thicker than the absorbent body 144 of the comparative example, and a sense of security can be obtained from the viewpoint of wearability and water absorption performance.

The reason why the absorbent body 44 of the embodiment can suppress the rewet amount and the compression energy is larger than that of the absorbent body 144 of the comparative example is, for example, that the core body 41 of the embodiment is bulkier than the core body 141 of the comparative example It is thought that it is soft.

Further, in the embodiment, moisture diffuses into the core body 41 through the fiber gaps of the long fibers of acetate tow inside the core body 41, and water is efficiently supplied to the granular materials 45 respectively disposed above and below the core body 41. It is conceivable that the amount of moisture remaining around the granular material 45 is reduced as compared with the comparative example due to the water absorption.

On the other hand, in the comparative example, since the liquid diffusibility of the core body 141 is lower than that of the core body 41 of the example, the granular material 45 cannot sufficiently absorb water compared to the example, and the second rewetting amount Is thought to have increased.

The present invention is not limited to the embodiments, and the configuration and method thereof can be changed, added, or deleted without departing from the spirit of the present invention. In the absorbent body 44, two or more core bodies 41 may be disposed between the first sheet 42 and the second sheet 43. For example, by arranging two or more core bodies 41 in an overlapping manner, the basis weight of the toe band 40 in the core body 41 can be increased, and the bulkiness (thickness) of the absorbent body 44 and the absorbent article 46 can be easily increased. it can.

Moreover, by cutting the toe band 40 into a predetermined width dimension, the basis weight of the toe band 40 in the core body 41 can be reduced, and the bulkiness (thickness) of the absorbent body 44 and the absorbent article 46 can be easily reduced. .

As described above, according to the present invention, in an absorbent article including an absorbent body in which water-absorbing granular materials are dispersed and arranged, an excellent effect that the touch feeling during use is good and the bulky state can be maintained. Have. Therefore, it is beneficial to apply widely as an absorbent body and an absorbent article that can exhibit the significance of this effect.

41 Core body 42 1st sheet 43 2nd sheet 44 Absorber 45 Granule 46 Absorbent article 47 Top sheet 48 Back sheet

Claims

A first sheet made of non-woven fabric;
A second sheet made of a non-woven fabric, arranged to overlap the first sheet;
A core body disposed between the first sheet and the second sheet;
A water-absorbing granular material arranged dispersed between the first sheet and the core body and between the second sheet and the core body,
An absorbent body, wherein the core body comprises a tow band obtained by crimping and opening cellulose acetate tow long fibers.
The absorbent core according to claim 1, wherein the core body is in a sheet shape and is disposed so as to overlap the first sheet and the second sheet.
The absorbent body according to claim 1 or 2, wherein a basis weight of the tow band in the core body is set to a value in a range of 15 gsm to 150 gsm.
An absorber according to any one of claims 1 to 3,
A back sheet disposed on the opposite side of the core of the first sheet;
An absorbent article comprising: a top sheet disposed on the opposite side of the second sheet from the core body.