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JP7556752B2 - Nonwoven fabric manufacturing method and nonwoven fabric manufacturing device - Google Patents
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JP7556752B2 - Nonwoven fabric manufacturing method and nonwoven fabric manufacturing device - Google Patents

Nonwoven fabric manufacturing method and nonwoven fabric manufacturing device Download PDF

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JP7556752B2
JP7556752B2 JP2020187347A JP2020187347A JP7556752B2 JP 7556752 B2 JP7556752 B2 JP 7556752B2 JP 2020187347 A JP2020187347 A JP 2020187347A JP 2020187347 A JP2020187347 A JP 2020187347A JP 7556752 B2 JP7556752 B2 JP 7556752B2
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flexible support
nonwoven fabric
heat
web
pushing member
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JP2022076782A (en
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秀行 小林
吉彦 瀬戸
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Kao Corp
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Description

本発明は、不織布の製造方法及び不織布の製造装置に関する。 The present invention relates to a method for manufacturing nonwoven fabric and an apparatus for manufacturing nonwoven fabric.

吸収性物品に用いられるような不織布の製造方法に関して、風合いに優れた不織布を製造するための技術がこれまで多く提案されてきた。
例えば、特許文献1には、多数の突起を有し通気性を有する台座の上に繊維ウェブを定着させ、次いで台座上の繊維ウェブに熱風を吹き付けて突起にそって繊維ウェブを賦形するとともに繊維を融着させる、不織布の製造方法が記載されている。
また、特許文献2には、所定の凸部、凹部、及び開孔を有する支持体上に繊維ウェブを載置し、凹部に沿って繊維ウェブを押し込み部材によって押し込む押し込み工程と、次いで熱風を吹き付けて繊維ウェブ中の繊維同士を融着する熱融着工程とを有する不織布の製造方法が記載されている。
Regarding the manufacturing method of nonwoven fabrics for use in absorbent articles, many techniques have been proposed for manufacturing nonwoven fabrics having excellent feel.
For example, Patent Document 1 describes a method for producing a nonwoven fabric, in which a fiber web is fixed onto a breathable base having a large number of protrusions, and then hot air is blown onto the fiber web on the base to shape the fiber web along the protrusions and fuse the fibers.
Furthermore, Patent Document 2 describes a method for manufacturing a nonwoven fabric, which includes a pressing step in which a fiber web is placed on a support having predetermined protrusions, recesses, and openings, and the fiber web is pressed along the recesses with a pressing member, and then a heat fusion step in which hot air is blown to fuse the fibers in the fiber web to each other.

特開2012-136791号公報JP 2012-136791 A 特開2019-112747号公報JP 2019-112747 A

特許文献1に記載の不織布の製造方法は、台座を別の部材と噛み合わせて繊維ウェブを賦形するのではなく、熱風の風圧で繊維ウェブを押し込んで賦形するものである。このような賦形の工程では、熱風を高速で吹き付けることを要する。即ち、熱風の風速の範囲には一定の制約があり、賦形できる凹凸の厚みには限度があった。
また、特許文献2に記載の不織布の製造方法は、具体的にはドラム形状の支持体を用いたものであり、ドラム形状の支持体と押し込み部材とによる噛み合い賦形で、より高低差のある凹凸形状を繊維ウェブに形成することができる。その一方で、凹凸形状はドラムの一部として形成されている場合が多い。故に、凹凸パターンの変更にはドラム交換を伴うことが多く、パターンの自由な変更を困難にしていた。
更に、台座や支持体は硬質なものであり、熱膨張等によって支持体と押し込み部材との噛み合い位置が合わず、支持体と押し込み部材とが衝突して破損しやすいことが挙げられた。
The method for manufacturing a nonwoven fabric described in Patent Document 1 does not shape a fiber web by engaging a base with another member, but by pressing the fiber web with hot air pressure. In this shaping process, it is necessary to blow hot air at a high speed. That is, there is a certain restriction on the range of the hot air speed, and there is a limit to the thickness of the unevenness that can be formed.
In addition, the nonwoven fabric manufacturing method described in Patent Document 2 specifically uses a drum-shaped support, and the engagement of the drum-shaped support and a pressing member allows the formation of a fibrous web with a convexo-concave shape with greater height differences. On the other hand, the convexo-concave shape is often formed as part of the drum. Therefore, changing the convexo-concave pattern often requires replacing the drum, making it difficult to freely change the pattern.
Furthermore, the base and the support are hard, and thermal expansion or the like causes the support and the push-in member to misalign and collide with each other, resulting in damage.

本発明は、上記の点に鑑み、凹凸賦形のパターン変更の自由度が高く、且つ支持体と押し込み部材とが衝突した際に破損しにくい、不織布の製造方法に関する。
また、本発明は、前記不織布の製造方法を好適に実施できる、不織布の製造装置に関する。
In view of the above, the present invention relates to a method for producing a nonwoven fabric that has a high degree of freedom in changing the pattern of uneven shaping and is less likely to be damaged when a support body and a pushing member collide with each other.
The present invention also relates to an apparatus for producing a nonwoven fabric, which can suitably carry out the method for producing a nonwoven fabric.

本発明は、凹凸形状を有する可撓性支持体と、該可撓性支持体に噛み合い可能な押し込み部材とにより、熱融着性ウェブを挟持して賦形する工程と、前記熱融着性ウェブを前記可撓性支持体上で加熱流体により融着処理する工程とを有する、不織布の製造方法を提供する。 The present invention provides a method for producing a nonwoven fabric, which includes a step of clamping and shaping a heat-sealable web between a flexible support having an uneven shape and a pushing member that can engage with the flexible support, and a step of fusing the heat-sealable web on the flexible support with a heated fluid.

また、本発明は、凹凸形状を有する可撓性支持体と、該可撓性支持体に噛み合い可能な押し込み部材と、該可撓性支持体上で熱融着性ウェブの融着処理が可能な加熱流体吹き付け機構とを有する、不織布の製造装置を提供する。 The present invention also provides a nonwoven fabric manufacturing device having a flexible support having an uneven shape, a pushing member that can engage with the flexible support, and a heated fluid spraying mechanism that can perform a fusion process on a heat-sealable web on the flexible support.

本発明の不織布の製造方法によれば、凹凸賦形のパターン変更の自由度が高く、且つ支持体と押し込み部材とが衝突した際に破損しにくいものである。
また、本発明の不織布の製造装置は、本発明の不織布の製造方法を好適に実施できる。
According to the method for producing a nonwoven fabric of the present invention, there is a high degree of freedom in changing the pattern of the uneven shaping, and the support body is less likely to be damaged when it collides with the pushing member.
The nonwoven fabric manufacturing apparatus of the present invention can suitably carry out the nonwoven fabric manufacturing method of the present invention.

本発明の不織布の製造方法に用いられる装置の好ましい実施形態を模式的に示す概略正面図である。FIG. 1 is a schematic front view showing a preferred embodiment of an apparatus used in a method for producing a nonwoven fabric of the present invention. 本発明の不織布の製造方法に用いられる装置の別の好ましい実施形態を模式的に示す概略正面図である。FIG. 2 is a schematic front view showing another preferred embodiment of an apparatus used in the method for producing a nonwoven fabric of the present invention. 可撓性支持体の突起と押し込み部材の凸部との配置関係の一例を示した部分断面図である。11 is a partial cross-sectional view showing an example of the positional relationship between a protrusion of a flexible support and a convex portion of a push-in member. FIG.

以下、本発明の不織布の製造方法及び不織布の製造装置について、図面を参照しながら説明する。
なお、本明細書において、不織布の製造時の搬送方向をMD方向(Machine Direction)といい、該搬送方向に直交する幅方向をCD方向(Cross Direction)という。また、MD方向とCD方向とを含む面の方向を平面方向といい、該平面方向の接線の法線方向を厚み方向という。
Hereinafter, the method and apparatus for producing a nonwoven fabric according to the present invention will be described with reference to the drawings.
In this specification, the conveying direction during the manufacture of a nonwoven fabric is referred to as the MD (machine direction), the width direction perpendicular to the conveying direction is referred to as the CD (cross direction), the direction of a surface including the MD and CD directions is referred to as the planar direction, and the normal direction of the tangent to the planar direction is referred to as the thickness direction.

(賦形工程)
本発明の不織布の製造方法は、凹凸形状を有する可撓性支持体と、該可撓性支持体に噛み合い可能な押し込み部材とにより、熱融着性ウェブを挟持して賦形する工程(以下、「賦形工程」という。)を有する。
例えば図1に示すように、可撓性支持体21をベルトコンベア状に湾曲させて、熱融着性ウェブ11の加工を行うことができる。可撓性支持体21は複数の突起24を所定の間隔で有しており、凹凸形状の表面を備える。可撓性支持体21と、これに対向するように配置された押し込み部材31とが、同一速度で回転しながら、可撓性支持体21及び押し込み部材31の間で、上流側から搬送される熱融着性ウェブ11を挟持する。このベルトコンベア方式においては、両端のロール22,22に環状の可撓性支持体21を引っ掛け、可撓性支持体21を回転させる。押し込み部材31が可撓性支持体21の凹凸形状に噛み合いながら、熱融着性ウェブ11を挟み込む(可撓性支持体21の突起24,24間の位置で熱融着性ウェブ11を押し込む)。噛み合いにより、熱融着性ウェブ11が凹凸賦形されながら、熱融着性ウェブ11の構成繊維が厚み方向に配向し、厚みの大きな不織布10を製造することができる。
(Shaping process)
The method for producing a nonwoven fabric of the present invention includes a step of shaping a heat-fusible web by clamping it between a flexible support having an uneven surface and a pushing member that can engage with the flexible support (hereinafter referred to as the "shaping step").
For example, as shown in FIG. 1, the flexible support 21 can be curved like a belt conveyor to process the heat-sealable web 11. The flexible support 21 has a plurality of protrusions 24 at a predetermined interval and has an uneven surface. The flexible support 21 and a pushing member 31 arranged to face the flexible support 21 are rotated at the same speed, and the heat-sealable web 11 conveyed from the upstream side is sandwiched between the flexible support 21 and the pushing member 31. In this belt conveyor method, the ring-shaped flexible support 21 is hooked on the rolls 22, 22 at both ends, and the flexible support 21 is rotated. The pushing member 31 engages with the uneven shape of the flexible support 21 and sandwiches the heat-sealable web 11 (pushes the heat-sealable web 11 at a position between the protrusions 24, 24 of the flexible support 21). The intermeshing gives the heat-sealable web 11 an uneven shape, while the constituent fibers of the heat-sealable web 11 are oriented in the thickness direction, making it possible to produce a nonwoven fabric 10 with a large thickness.

(可撓性支持体)
可撓性支持体における「可撓性」とは、線状又は平面状の物体を曲率半径100mmにて180°曲げた後に、再度線状又は平面状に伸ばす操作を100回繰り返しても、破損又は亀裂の発生が生じない性質をいう。この曲げ伸ばしの操作を100回行うことで、対象物が可撓性を有するか否かを判定することができる。このとき、破損や亀裂の発生が生じる性質を、本明細書では「非可撓性」という。
可撓性支持体では突起間の基材部分が柔軟性を有する。このような可撓性支持体は、突起で熱融着性ウェブをしっかり保持しながら、押し込み部材による熱融着性ウェブの押し込みを可撓性支持体の基材が柔軟に受け止めるので、立体的に厚みがより大きく、底の深い賦形を可能にする。
(Flexible Support)
"Flexibility" in the case of a flexible support refers to a property in which a linear or planar object is bent 180° at a curvature radius of 100 mm, and then stretched back into a linear or planar shape 100 times without breaking or cracking. By performing this bending and stretching operation 100 times, it is possible to determine whether or not the object has flexibility. In this specification, a property that causes breakage or cracking is referred to as "inflexibility."
In the case of a flexible support, the base material portion between the protrusions has flexibility. In such a flexible support, the protrusions firmly hold the heat-sealable web, while the base material of the flexible support flexibly receives the pressing of the heat-sealable web by the pressing member, so that it is possible to form a shape with a larger three-dimensional thickness and a deeper bottom.

可撓性支持体21は、可撓性を有するが故に、平面や曲面等、様々な形に沿わせることができる。即ち、様々な形態の加工ラインを構築し、様々なパターンの不織布の製造に対応できる。例えば、図1に示すようにベルトコンベア方式としてもよく、図2に示すようにドラム23の周表面に固定してもよい。図2に示すドラム方式の場合、ドラム23が可撓性を有していなくても、可撓性支持体21が可撓性を有することで、ドラム23を交換することなく可撓性支持体21を取り換えることができる。これにより可撓性支持体21表面にある突起24の形状や大きさを容易に変更でき、凹凸賦形のパターン変更が容易となる。
但し、ドラム23の回転に伴う遠心力の影響で熱融着性ウェブ11が可撓性支持体21から浮き上がらないようにする観点及び後述の不織布化融着処理工程の区間を長くできる観点から、ドラム方式(図2に示す形態)よりも、ベルトコンベア方式(図1に示す形態)の方が好ましい。
また、押し込み部材31と可撓性支持体21とによって熱融着性ウェブ11を挟持する点において、可撓性支持体21の裏面側(熱融着性ウェブ11と接触する面と反対側)にガイドロールやドラム等のバックアップロール(図示せず)を有することが好ましい。バックアップロールがあることで、可撓性支持体21が厚み方向に変位しにくくなり、後述の噛み合い量Dが安定する。
Since the flexible support 21 has flexibility, it can be made to conform to various shapes, such as flat surfaces and curved surfaces. That is, various types of processing lines can be constructed to accommodate the production of nonwoven fabrics with various patterns. For example, it may be a belt conveyor type as shown in FIG. 1, or may be fixed to the peripheral surface of a drum 23 as shown in FIG. 2. In the case of the drum type shown in FIG. 2, even if the drum 23 does not have flexibility, the flexible support 21 has flexibility, so that the flexible support 21 can be replaced without replacing the drum 23. This makes it easy to change the shape and size of the protrusions 24 on the surface of the flexible support 21, making it easy to change the pattern of uneven shaping.
However, from the viewpoint of preventing the heat-fusible web 11 from lifting off the flexible support 21 due to the centrifugal force caused by the rotation of the drum 23 and from the viewpoint of lengthening the section of the nonwoven fabric fusion processing step described below, the belt conveyor type (the form shown in FIG. 1 ) is preferable to the drum type (the form shown in FIG. 2 ).
In addition, in the point where the heat-fusible web 11 is sandwiched between the pushing member 31 and the flexible support 21, it is preferable to have a backup roll (not shown) such as a guide roll or a drum on the back side (opposite the surface that contacts the heat-fusible web 11) of the flexible support 21. The presence of the backup roll makes it difficult for the flexible support 21 to be displaced in the thickness direction, and stabilizes the meshing amount D described below.

本発明に用いられる可撓性支持体21が可撓性を有することで、不織布10の製造ラインのパターン変更もしくは微調整の自由度がより高くなる。例えば、可撓性支持体21を図1に示すようなベルトコンベア状にすると、後述の不織布化融着処理工程の区間を長くすることができ、製造ラインに合わせて融着処理の時間を長く取ることができる。こうすることで、低風速により時間を掛けてゆっくりと融着処理を行うことができ、製造される不織布10の繊維層の厚みが増す。即ち、所望の不織布10を製造しやすくなる。また、熱風による繊維のより分けも抑えられ、得られる不織布10の繊維間距離も高く維持され、風合いよく、液や空気等の流体の透過性も高まる。加えて、可撓性支持体21と押し込み部材31との噛み合い時に、突起24の位置ずれが生じても、可撓性支持体21が変形することで、突起24と押し込み部材31との衝突による力を軽減できる。その結果、可撓性支持体21及び押し込み部材31の破損を防止することができる。同時に、衝突部分における熱融着性ウェブ11の切れも防止できる。
押し込み部材31が可撓性支持体21に噛み合う際に、押し込み部材31の先端が突起24に接触すると、突起24が平面方向に倒れる力が加わる。従来のように、突起が非可撓性の支持体に固定されていると、突起が曲がったり折れたりする。或いは押し込み部材が曲がったり折れたりすることもある。一方、本発明のように、突起24が可撓性支持体21に固定されている場合は、可撓性支持体21が変形することで突起24の折れ曲がりや破損を防止することができる。可撓性支持体21と押し込み部材31との噛み合いを解き、可撓性支持体21が押し込み部材31に接触しない状態になると、突起24に力が加わらなくなり、可撓性支持体21の弾性力により突起24の位置は元に戻る。また、可撓性支持体21が可撓性を有することに加えて、突起24も可撓性を有することが好ましく、突起24と可撓性支持体21との接合部も可撓性を有することがより好ましく、押し込み部材31も可撓性を有することが更に好ましい。
突起24の折れ曲がりや破損を防止する観点から、突起24の変形量は、0.8mm以上が好ましく、1mm以上がより好ましい。また、熱融着性ウェブ11を変形させるために適度な剛性を有する観点から、突起24の変形量は10mm以下が好ましく、8mm以下がより好ましい。
更には、突起24の変形量が上記範囲であると、製造された不織布10を可撓性支持体21から引き剥がす際、可撓性支持体21表面の突起24が傾く等、可撓性支持体21が不織布10を引き剥がす方向に変形し、不織布10を剥がしやすくなる。
The flexibility of the flexible support 21 used in the present invention allows for greater freedom in changing or fine-tuning the pattern of the production line for the nonwoven fabric 10. For example, if the flexible support 21 is in the form of a belt conveyor as shown in FIG. 1, the section of the nonwoven fabric fusion treatment process described below can be lengthened, and the fusion treatment time can be extended to match the production line. In this way, the fusion treatment can be performed slowly over time at a low wind speed, and the thickness of the fiber layer of the nonwoven fabric 10 produced increases. That is, it becomes easier to produce the desired nonwoven fabric 10. In addition, the separation of fibers by hot air is suppressed, and the inter-fiber distance of the obtained nonwoven fabric 10 is maintained high, resulting in a good texture and increased permeability to fluids such as liquid and air. In addition, even if the position of the protrusions 24 is shifted when the flexible support 21 and the pushing member 31 are engaged, the flexible support 21 deforms, thereby reducing the force caused by the collision between the protrusions 24 and the pushing member 31. As a result, damage to the flexible support 21 and the pushing member 31 can be prevented. At the same time, the heat-sealable web 11 can be prevented from being cut at the collision portion.
When the pushing member 31 engages with the flexible support 21, if the tip of the pushing member 31 comes into contact with the protrusion 24, a force is applied that causes the protrusion 24 to fall in a planar direction. If the protrusion is fixed to a non-flexible support as in the past, the protrusion may bend or break. Alternatively, the pushing member may bend or break. On the other hand, if the protrusion 24 is fixed to the flexible support 21 as in the present invention, the flexible support 21 is deformed to prevent the protrusion 24 from bending or breaking. When the flexible support 21 and the pushing member 31 are released from the engagement and the flexible support 21 is no longer in contact with the pushing member 31, no force is applied to the protrusion 24, and the position of the protrusion 24 returns to its original position due to the elastic force of the flexible support 21. In addition to the flexible support 21 being flexible, it is preferable that the protrusion 24 is also flexible, it is more preferable that the joint between the protrusion 24 and the flexible support 21 is also flexible, and it is even more preferable that the pushing member 31 is also flexible.
From the viewpoint of preventing bending or breakage of the protrusions 24, the deformation amount of the protrusions 24 is preferably 0.8 mm or more, and more preferably 1 mm or more. Moreover, from the viewpoint of having appropriate rigidity for deforming the heat-fusible web 11, the deformation amount of the protrusions 24 is preferably 10 mm or less, and more preferably 8 mm or less.
Furthermore, when the deformation amount of the protrusions 24 is within the above range, when the manufactured nonwoven fabric 10 is peeled off from the flexible support 21, the protrusions 24 on the surface of the flexible support 21 are tilted, for example, so that the flexible support 21 deforms in the direction in which the nonwoven fabric 10 is peeled off, making it easier to peel off the nonwoven fabric 10.

(突起の変形量の測定方法)
突起24の変形量は、以下のようにして測定することができる。
先端角90度の金属製ブロックを、先端の傾斜面が厚み方向に対して45度の角度を有するように、引張試験機(商品名:オートグラフAG-1kNIS、株式会社島津製作所製)のロードセルに固定する。このとき、ロードセルの中心軸に金属製ブロックの先端が位置するように、金属製ブロックをロードセルに固定する。ロードセルは引張試験機の可動フレームに固定される。金属製ブロックの傾斜面は平滑面とする。引張試験機の下側に可撓性支持体21をセットし、50mm角の窓枠を有する150mm角の平板(厚み:10mm)を対象とする突起24が窓枠の中心になるように可撓性支持体21の上にかぶせ、可撓性支持体21が浮かないように窓枠周辺に錘を載せる。錘による荷重は約0.05kg/cmとなるようにする。このとき、可撓性支持体21の厚み方向とロードセルの圧縮方向とが一致するように可撓性支持体21をセットする。ロードセルの中心軸から約1mmずらした位置に可撓性支持体21の突起24が位置するようにセットし、傾斜角45度を有する金属製ブロックを10mm/分の速度で圧縮方向に変位させ、金属製ブロックの先端を突起24にあてる。荷重0.1Nになる変位点をゼロ点とし、圧縮荷重が1Nとなった時の圧縮方向の変位量(mm)を測定する。
突起24の倒れる方向に対して可撓性支持体21の平面方向がランダムとなるようにして可撓性支持体21をセットし直し、異なる突起24について同様に測定し、5個の変位量の測定結果の平均値を、突起24の変形量とする。尚、参考としてロードセルは約100Nの定格容量のものを用いる。
(Method of measuring deformation of protrusion)
The deformation amount of the protrusion 24 can be measured as follows.
A metal block with a tip angle of 90 degrees is fixed to the load cell of a tensile tester (product name: Autograph AG-1kNIS, manufactured by Shimadzu Corporation) so that the inclined surface of the tip has an angle of 45 degrees with respect to the thickness direction. At this time, the metal block is fixed to the load cell so that the tip of the metal block is located on the central axis of the load cell. The load cell is fixed to the movable frame of the tensile tester. The inclined surface of the metal block is a smooth surface. A flexible support 21 is set on the underside of the tensile tester, and the protrusion 24, which is intended for a 150 mm square flat plate (thickness: 10 mm) having a 50 mm square window frame, is placed on top of the flexible support 21 so that it is at the center of the window frame, and a weight is placed around the window frame so that the flexible support 21 does not float. The load by the weight is set to about 0.05 kg/cm 2. At this time, the flexible support 21 is set so that the thickness direction of the flexible support 21 and the compression direction of the load cell coincide with each other. The protrusion 24 of the flexible support 21 is set at a position shifted about 1 mm from the central axis of the load cell, and a metal block having an inclination angle of 45 degrees is displaced in the compression direction at a speed of 10 mm/min until the tip of the metal block contacts the protrusion 24. The displacement point where the load becomes 0.1 N is set as the zero point, and the amount of displacement (mm) in the compression direction when the compressive load becomes 1 N is measured.
The flexible support 21 is reset so that the planar direction of the flexible support 21 is random with respect to the direction in which the protrusions 24 fall, and measurements are similarly taken for different protrusions 24. The average value of the five displacement measurement results is taken as the deformation amount of the protrusions 24. For reference, a load cell with a rated capacity of approximately 100 N is used.

(熱融着性ウェブ)
加工対象である熱融着性ウェブ11は、繊維同士が接合される前の熱融着性繊維の集合体である。即ち、不織布化する前の素材である。このようなウェブを用いることで、不織布10の製造過程において繊維の移動が行われやすく、立体的に深いパターンで厚みの大きな不織布10を製造しやすくなる。
熱融着性ウェブは、不織布のシートとしての一体性を保つための熱融着や交絡等が繊維間になく、繊維の移動の自由度が確保されている。いわゆる、未融着の状態である。熱融着性ウェブは、シートとしての一体性が保持されず繊維の移動の自由度が高い状態にある限り、繊維同士の圧着や若干の融着があってもよい。なお、機械交絡や水流交絡がされたものは、熱融着性ウェブに含まれない。
(Heat-sealable web)
The heat-fusible web 11 to be processed is an aggregate of heat-fusible fibers before the fibers are bonded to each other. In other words, it is a material before being made into a nonwoven fabric. By using such a web, the fibers are easily moved during the manufacturing process of the nonwoven fabric 10, and it is easy to manufacture a nonwoven fabric 10 with a deep three-dimensional pattern and a large thickness.
In a heat-sealable web, there is no heat fusion or entanglement between the fibers to maintain the integrity of the nonwoven fabric as a sheet, and the freedom of fiber movement is ensured. This is a so-called unfused state. As long as the integrity of the heat-sealable web as a sheet is not maintained and the freedom of fiber movement is high, there may be pressure bonding or slight fusion between the fibers. Note that those that have been mechanically entangled or hydroentangled are not included in the heat-sealable web.

本発明における熱融着性ウェブ11は、1層のみからなる単層ウェブでもよく、厚み方向に2層以上積層させた積層ウェブでもよい。
また、賦形工程において、熱融着性ウェブ11に孔を開けることが好ましい。不織布化前に孔を開け、より分けられた繊維が孔の周辺に集積することにより、製造される不織布10の孔の周辺で厚みを大きくすることができ、潰れても排泄液が戻りにくい不織布10となる。
排泄液の透過性を高める観点から、熱融着性ウェブ11に開ける孔は、直径0.5mm以上の円形が好ましく、直径1.0mm以上の円形がより好ましく、直径2.0mm以上の円形が更に好ましい。また、不織布10を表面シートとして吸収性物品に組み込んで使用する際に、不織布10よりも非肌面側のシート(サブレイヤーや吸収体コアラップ等)と肌とを接しにくくする観点から、熱融着性ウェブ11に開ける孔は、直径10mm以下の円形が好ましく、直径8mm以下の円形がより好ましい。孔の形状が円形でない場合は、これらの円形の面積の上下限値の範囲内の孔であることが好ましい。
また、熱融着性ウェブ11に開ける孔は、厚み方向に貫通していてもよく、貫通していなくてもよい。即ち、熱融着性ウェブ11の一方の表面が厚み方向に窪み、もう一方の表面では遮蔽されていてもよい。熱融着性ウェブ11に孔を開ける方法については、後述する。
The heat-sealable web 11 in the present invention may be a single-layer web consisting of only one layer, or may be a laminated web in which two or more layers are laminated in the thickness direction.
In the shaping step, it is preferable to open holes in the heat-fusible web 11. By opening holes before nonwoven fabric formation and accumulating the separated fibers around the holes, the thickness of the nonwoven fabric 10 around the holes can be increased, resulting in a nonwoven fabric 10 that is less likely to allow excreted liquid to return even if it is crushed.
From the viewpoint of increasing the permeability of excretory liquid, the holes opened in the heat-sealable web 11 are preferably circular with a diameter of 0.5 mm or more, more preferably circular with a diameter of 1.0 mm or more, and even more preferably circular with a diameter of 2.0 mm or more. Furthermore, from the viewpoint of preventing contact between the skin and a sheet (such as a sublayer or absorbent core wrap) on the non-skin side of the nonwoven fabric 10 when the nonwoven fabric 10 is incorporated and used as a top sheet in an absorbent article, the holes opened in the heat-sealable web 11 are preferably circular with a diameter of 10 mm or less, and more preferably circular with a diameter of 8 mm or less. When the shape of the holes is not circular, it is preferable that the holes are within the range of the upper and lower limits of the area of the circles.
The holes to be made in the heat-sealable web 11 may or may not penetrate the web in the thickness direction. That is, one surface of the heat-sealable web 11 may be recessed in the thickness direction, and the other surface may be sealed. The method of making holes in the heat-sealable web 11 will be described later.

(不織布化融着処理工程)
本発明の不織布の製造方法は、熱融着性ウェブを可撓性支持体上で加熱流体により融着処理する工程(以下、「不織布化融着処理工程」という。)を有する。熱融着とは、熱融着性ウェブ11が溶融することで、熱融着性ウェブ11の構成繊維が融着処理前の繊維形態を有しなくなることを意味する。例えば、熱融着性ウェブ11の構成繊維の外周面の少なくとも一部分が溶融し、他の繊維の外周面との境界が判別できなくなり、融着処理前の繊維形態を有しなくなる。複合繊維等、熱融着性ウェブ11の構成繊維が2種以上の樹脂からなる場合は、特定の樹脂が溶融せずに繊維形態を保っていても、他の樹脂が溶融し、熱融着性ウェブ11の構成繊維の外周面同士の境界が判別できなくなり、融着処理前の繊維形態を有しなくなる。これらは繊維融着部の断面を走査型電子顕微鏡(Scanning Electron Microscope:SEM、商品名:JCM-600、日本電子株式会社製)により観察することで可能である。
不織布化融着処理工程においては、熱融着性ウェブ11には可撓性支持体21上で加熱流体41が吹き付けられ、熱処理が行われる。具体的には、図1及び2に示すように、熱融着性ウェブ11が可撓性支持体21上で搬送される間、所定温度に加熱された加熱流体41が厚み方向にエアスルー方式で熱融着性ウェブ11に吹き付けられる。このようにして、熱融着性ウェブ11の構成繊維同士の交点を熱融着で接合して不織布化し、不織布10を製造することができる。
(Nonwoven fabric fusion treatment process)
The method for producing a nonwoven fabric of the present invention includes a step of subjecting a heat-sealable web to a fusion treatment on a flexible support with a heated fluid (hereinafter referred to as a "nonwoven fabric fusion treatment step"). Heat fusion means that the heat-sealable web 11 melts, and the constituent fibers of the heat-sealable web 11 no longer have the fiber form before the fusion treatment. For example, at least a part of the outer peripheral surface of the constituent fibers of the heat-sealable web 11 melts, and the boundary with the outer peripheral surface of the other fibers becomes indistinguishable, and the fiber form before the fusion treatment is no longer retained. When the constituent fibers of the heat-sealable web 11, such as composite fibers, are made of two or more resins, even if a specific resin does not melt and maintains its fiber form, the other resins melt, and the boundary between the outer peripheral surfaces of the constituent fibers of the heat-sealable web 11 becomes indistinguishable, and the fiber form before the fusion treatment is no longer retained. These can be observed by observing the cross section of the fused fiber portion with a scanning electron microscope (SEM, product name: JCM-600, manufactured by JEOL Ltd.).
In the nonwoven fabric fusion treatment step, a heated fluid 41 is sprayed onto the heat-fusible web 11 on the flexible support 21, and heat treatment is performed. Specifically, as shown in Figures 1 and 2, while the heat-fusible web 11 is transported on the flexible support 21, the heated fluid 41 heated to a predetermined temperature is sprayed onto the heat-fusible web 11 in the thickness direction by an air-through method. In this manner, the intersections between the constituent fibers of the heat-fusible web 11 are bonded by heat fusion to form a nonwoven fabric, and the nonwoven fabric 10 can be manufactured.

(加熱流体)
加熱流体41は、熱融着性ウェブ11を不織布化できる限り、特に限定されない。例えば、熱風や水蒸気が挙げられる。但し、熱融着性ウェブ11表面の繊維油剤を流れにくくする観点から、熱風が好ましい。
特許文献1に記載のように、熱風の風速は20m/秒以上100m/秒以下とすることが従来では一般的であった。一方で本発明では、可撓性支持体21を用いることにより、前述の通り、融着処理の時間を長くする(熱処理の区間を長く取る)ことが可能である。そのため、賦形工程にて熱融着性ウェブ11を厚み方向に押し込んだ後、不織布化融着処理工程ではそのまま可撓性支持体21上で、従来よりも低速の風速で繊維同士の熱融着を行うことも可能である。また、加熱流体41によって熱融着性ウェブ11が圧密化することなく、嵩高な不織布10を得ることができる。
製造される不織布10の厚みを大きくする観点から、加熱流体41の風速は10m/秒以下が好ましく、5m/秒以下がより好ましく、2m/秒以下が更に好ましい。また、熱融着性ウェブ11の不織布化を十分に行う観点から、加熱流体41の風速は0.1m/秒以上が好ましく、0.2m/秒以上がより好ましく、0.3m/秒以上が更に好ましい。
(Heating Fluid)
The heating fluid 41 is not particularly limited as long as it can convert the heat-sealable web 11 into a nonwoven fabric. For example, hot air or steam can be used. However, hot air is preferred from the viewpoint of making it difficult for the fiber oil on the surface of the heat-sealable web 11 to flow.
As described in Patent Document 1, the wind speed of the hot air was generally set to 20 m/s or more and 100 m/s or less. On the other hand, in the present invention, by using the flexible support 21, it is possible to extend the fusion treatment time (lengthen the heat treatment section) as described above. Therefore, after the heat-fusible web 11 is pressed in the thickness direction in the shaping process, it is also possible to perform heat fusion between the fibers on the flexible support 21 at a wind speed slower than that of the conventional method in the nonwoven fabric fusion treatment process. In addition, a bulky nonwoven fabric 10 can be obtained without the heat-fusible web 11 being compacted by the heating fluid 41.
From the viewpoint of increasing the thickness of the produced nonwoven fabric 10, the wind speed of the heated fluid 41 is preferably 10 m/sec or less, more preferably 5 m/sec or less, and even more preferably 2 m/sec or less. From the viewpoint of sufficiently forming the heat-fusible web 11 into a nonwoven fabric, the wind speed of the heated fluid 41 is preferably 0.1 m/sec or more, more preferably 0.2 m/sec or more, and even more preferably 0.3 m/sec or more.

加熱流体41の温度は、熱融着性ウェブ11の構成繊維の樹脂の最も低い融点以上であることが好ましく、該融点との温度差が60℃以下であることが好ましい。これにより繊維融着部の形成による賦形形状の安定化ができ、且つ、可撓性支持体21と良好に剥離することができる。
繊維融着部を良好に形成する観点から、熱処理の区間の長さは1m以上が好ましく、3m以上がより好ましい。また、可撓性支持体21の軽量化の観点から、熱処理の区間の長さは30m以下が好ましく、20m以下がより好ましい。
繊維融着部を良好に形成する観点から、加熱流体41の吹き付け時間は0.2秒以上が好ましく、0.5秒以上がより好ましい。また、可撓性支持体21の軽量化の観点から、加熱流体41の吹き付け時間は20秒以下が好ましく、12秒以下がより好ましい。
The temperature of the heating fluid 41 is preferably equal to or higher than the lowest melting point of the resin of the constituent fibers of the heat-fusible web 11, and the temperature difference from the melting point is preferably 60° C. or less. This makes it possible to stabilize the shaped shape formed by the formation of the fused fiber parts, and also allows the web to be easily peeled off from the flexible support 21.
From the viewpoint of forming a good fiber fusion portion, the length of the heat treatment section is preferably 1 m or more, and more preferably 3 m or more. From the viewpoint of reducing the weight of the flexible support 21, the length of the heat treatment section is preferably 30 m or less, and more preferably 20 m or less.
From the viewpoint of forming a good fiber fusion portion, the spraying time of the heated fluid 41 is preferably 0.2 seconds or more, and more preferably 0.5 seconds or more. From the viewpoint of reducing the weight of the flexible support 21, the spraying time of the heated fluid 41 is preferably 20 seconds or less, and more preferably 12 seconds or less.

本発明の不織布の製造方法は、賦形工程及び不織布化融着処理工程以外に、他の工程を有していてもよい。 The method for producing the nonwoven fabric of the present invention may include other steps in addition to the shaping step and the nonwoven fabric fusion treatment step.

(ウェブ離型工程)
本発明の不織布の製造方法は、賦形工程の後且つ不織布化融着処理工程の前に、押し込み部材31側から熱融着性ウェブ11に向けて流体42を吹き付け、熱融着性ウェブ11を離型する工程(以下、「ウェブ離型工程」という。)を有することが好ましい。より具体的には、可撓性支持体21と押し込み部材31とによる噛み合いの出口において、流体42を吹き付けて熱融着性ウェブ11を押し込み部材31から離型する。ウェブ離型工程があることで、賦形工程から不織布化融着処理工程への移行を滑らかにすることができる。特に、押し込み部材31から離型した熱融着性ウェブ11が、可撓性支持体21に保持されることが好ましい。
熱融着性ウェブ11の繊維同士の融着は不織布化融着処理工程で行われるが、ウェブ離型工程において熱融着性ウェブ11の繊維同士の仮融着を行ってもよい。押し込み部材31の凸部32間を通すように流体42を押し込み部材31側から吹き付けて仮融着を行うと、賦形された熱融着性ウェブ11の形を崩すことなく、融着処理と剥離処理とをより良好に行うことができる。この仮融着の際の流体42の温度は、熱融着性ウェブ11の構成繊維の樹脂の最も低い融点以上であることが好ましく、該融点との温度差が30℃以下であることが好ましい。また、流体42の風速は0.5m/秒以上3m/秒以下が好ましく、流体42による処理時間は0.01秒以上0.1秒以下が好ましい。これらの数値範囲を満たすことで、押し込み部材31に熱融着性ウェブ11の構成繊維が貼り付きにくく、噛み合い状態での凹凸形状を保つことができる。
(Web release process)
The method for producing a nonwoven fabric of the present invention preferably includes a step of spraying a fluid 42 from the pushing member 31 side toward the heat-fusible web 11 and releasing the heat-fusible web 11 after the shaping step and before the nonwoven fabric fusion treatment step (hereinafter referred to as a "web releasing step"). More specifically, at the exit of the meshing between the flexible support 21 and the pushing member 31, the fluid 42 is sprayed to release the heat-fusible web 11 from the pushing member 31. The presence of the web releasing step allows for a smooth transition from the shaping step to the nonwoven fabric fusion treatment step. In particular, it is preferable that the heat-fusible web 11 released from the pushing member 31 is held by the flexible support 21.
The fibers of the heat-fusible web 11 are fused together in the nonwoven fabric fusion process, but the fibers of the heat-fusible web 11 may be pre-fused together in the web release process. If the pre-fusion is performed by blowing the fluid 42 from the pushing member 31 side so as to pass between the convex parts 32 of the pushing member 31, the fusion process and the peeling process can be performed better without destroying the shape of the shaped heat-fusible web 11. The temperature of the fluid 42 during the pre-fusion is preferably equal to or higher than the lowest melting point of the resin of the constituent fibers of the heat-fusible web 11, and the temperature difference from the melting point is preferably 30° C. or less. In addition, the wind speed of the fluid 42 is preferably 0.5 m/s or more and 3 m/s or less, and the processing time with the fluid 42 is preferably 0.01 seconds or more and 0.1 seconds or less. By satisfying these numerical ranges, the constituent fibers of the heat-fusible web 11 are less likely to stick to the pushing member 31, and the uneven shape in the meshed state can be maintained.

(積層工程)
本発明の不織布の製造方法は、不織布化融着処理工程の後に、不織布10に別の熱融着性ウェブや不織布を積層する工程を有してもよい。例えば、融着処理された不織布10を原料不織布として別の不織布と厚み方向に積層させ、2層以上からなる積層不織布を製造してもよい。
(Lamination process)
The method for producing the nonwoven fabric of the present invention may include, after the nonwoven fabric fusion treatment step, a step of laminating another heat-fusible web or nonwoven fabric on the nonwoven fabric 10. For example, the fusion-treated nonwoven fabric 10 may be laminated in the thickness direction as a raw material nonwoven fabric with another nonwoven fabric to produce a laminated nonwoven fabric consisting of two or more layers.

(エンボス融着処理工程)
本発明の不織布の製造方法は、熱融着性ウェブ11を押し込み部材31から離型した後において、エンボスによる融着処理を行う工程(以下、「エンボス融着処理工程」という。)を有してもよい。エンボス融着処理工程は、前述の不織布化融着処理工程の前にあっても後にあってもよく、前後両方にあってもよい。エンボス融着処理工程においては、加熱と挟持により繊維同士が融着される。
前述の不織布化融着処理工程においては繊維の交点で熱融着がなされるため、1つの繊維融着部につき2本の繊維が熱融着されることが多い。一方、エンボス融着処理工程においては、1つの融着部につき数本から数十本の繊維が熱融着される。
エンボス融着処理工程における加熱方法は、発熱体や熱媒体を用いる方法や超音波法を用いる方法が挙げられる。本発明の不織布の製造方法は、毛羽を抑える観点及び液の吸収性能を上げる観点から、不織布化融着処理工程の後にエンボス融着処理工程を有することが好ましい。
(Embossing and fusing process)
The method for producing a nonwoven fabric of the present invention may include a step of carrying out a fusion treatment by embossing after the heat-fusible web 11 is released from the pushing member 31 (hereinafter referred to as an "embossing and bonding step"). The embossing and bonding step may be carried out before or after the nonwoven fabric-forming fusion treatment step described above, or may be carried out both before and after. In the embossing and bonding step, the fibers are fused together by heating and clamping.
In the above-mentioned nonwoven fabric fusion process, since heat fusion is performed at the intersections of the fibers, two fibers are often heat fused to one fused fiber portion, whereas in the embossing process, several to several tens of fibers are heat fused to one fused fiber portion.
The heating method in the embossing and fusion treatment step can be a method using a heating element or a heating medium, or a method using an ultrasonic method. From the viewpoint of suppressing fuzz and improving the liquid absorption performance, the method for producing the nonwoven fabric of the present invention preferably includes an embossing and fusion treatment step after the nonwoven fabric-forming and fusion treatment step.

(追加融着処理工程)
本発明の不織布の製造方法は、可撓性支持体21上で行う前記不織布化融着処理工程に加え、熱融着性ウェブ11を可撓性支持体21から剥離させた後、追加の融着処理を行う工程(以下、「追加融着処理工程」という。)を有することが好ましい。追加融着処理工程における追加の融着処理は、不織布化融着処理工程における加熱流体41と同様の加熱流体(図示せず)を用いることができる。支持体にはフラット状のネット(コンベア)等を用いることができる。これにより毛羽を防止し、強度を向上させた、適度な圧縮硬さの不織布10をより好適に製造することができる。
追加融着処理工程における加熱流体の温度は、熱融着性ウェブ11の構成繊維の樹脂の最も低い融点以上であることが好ましく、該融点との温度差が50℃以下であることが好ましい。追加融着処理工程における加熱流体の風速は5m/秒以下が好ましく、3m/秒以下がより好ましく、1m/秒以下が更に好ましい。また、熱融着性ウェブ11の不織布化を十分に行う観点から、追加融着処理工程における加熱流体の風速は0.1m/秒以上が好ましく、0.2m/秒以上がより好ましく、0.3m/秒以上が更に好ましい。
(Additional fusion processing step)
In addition to the nonwoven fabric-forming fusion treatment step carried out on the flexible support 21, the nonwoven fabric manufacturing method of the present invention preferably includes a step of performing an additional fusion treatment after peeling the heat-fusible web 11 from the flexible support 21 (hereinafter referred to as the "additional fusion treatment step"). The additional fusion treatment in the additional fusion treatment step can use a heating fluid (not shown) similar to the heating fluid 41 in the nonwoven fabric-forming fusion treatment step. A flat net (conveyor) or the like can be used as the support. This makes it possible to more suitably manufacture a nonwoven fabric 10 having an appropriate compression hardness, which is prevented from fuzzing and has improved strength.
The temperature of the heated fluid in the additional fusion treatment step is preferably equal to or higher than the lowest melting point of the resin of the constituent fibers of the heat-fusible web 11, and the temperature difference from the melting point is preferably 50° C. or less. The wind speed of the heated fluid in the additional fusion treatment step is preferably 5 m/s or less, more preferably 3 m/s or less, and even more preferably 1 m/s or less. From the viewpoint of sufficiently forming the heat-fusible web 11 into a nonwoven fabric, the wind speed of the heated fluid in the additional fusion treatment step is preferably 0.1 m/s or more, more preferably 0.2 m/s or more, and even more preferably 0.3 m/s or more.

次に、本発明の不織布の製造方法に用いられる材料や装置について、詳細を説明する。 Next, we will explain in detail the materials and equipment used in the manufacturing method of the nonwoven fabric of the present invention.

(可撓性支持体の材質)
可撓性を可撓性支持体21に付与する観点から、可撓性支持体21は、樹脂若しくは金属、又はこれら両方からなることが好ましい。また、これらの材質を用いることで、不織布化融着処理工程において加熱流体41が吹き付けられても、可撓性支持体21が熱により変形することを防止できる。
可撓性支持体21を構成する樹脂としては、加熱流体41の温度よりも融点が高い樹脂や、架橋した硬化性樹脂が好ましい。具体的には、熱可塑性樹脂としてはポリアミド、ポリエステル(ポリエチレンテレフタレート(PET)等)、ポリエチレン(PE)、ポリフェニレンサルファイド、ポリプロピレンが挙げられ、硬化性樹脂としては塩化ビニル、シリコン樹脂、フッ素系樹脂、合成ゴムが挙げられる。この他にカーボン材質も挙げられる。可撓性支持体21の材質に樹脂を採用することで、可撓性支持体21の軽量化を図ることができる。また、金属と比べて耐久性が低い樹脂を採用しても、本発明では新しい可撓性支持体21へ容易に交換することができる。
可撓性支持体21を構成する金属としては、種々の公知の金属を用いることができる。可撓性支持体21の材質に金属を採用することで、耐久性の高い可撓性支持体21となる。
(Material of flexible support)
From the viewpoint of imparting flexibility to the flexible support 21, the flexible support 21 is preferably made of a resin or a metal, or both. Furthermore, by using these materials, the flexible support 21 can be prevented from being deformed by heat even when the heated fluid 41 is sprayed on the flexible support 21 in the nonwoven fabric fusion processing step.
The resin constituting the flexible support 21 is preferably a resin having a melting point higher than the temperature of the heating fluid 41 or a cross-linked curable resin. Specifically, examples of thermoplastic resins include polyamide, polyester (polyethylene terephthalate (PET), etc.), polyethylene (PE), polyphenylene sulfide, and polypropylene, while examples of curable resins include vinyl chloride, silicon resin, fluorine-based resin, and synthetic rubber. In addition, carbon materials are also included. By using a resin as the material for the flexible support 21, the flexible support 21 can be made lighter. Furthermore, even if a resin with lower durability than metal is used, the present invention allows the flexible support 21 to be easily replaced with a new one.
Various known metals can be used as the metal constituting the flexible support 21. By using a metal as the material for the flexible support 21, the flexible support 21 can have high durability.

(可撓性支持体の開口)
可撓性支持体21は開口を有していてもよく、有していなくてもよい。開口を有していない場合、不織布化融着処理工程においては、可撓性支持体21とこれに対向するように配置されたネット等(図示せず)とで熱融着性ウェブ11を挟んだ状態で、加熱流体41を吹き付けて融着処理を行うことが好ましい。こうすることで、賦形された熱融着性ウェブ11の形を崩すことなく、融着処理を行うことができる。
但し、不織布化融着処理工程において加熱流体41を貫通させる観点から、可撓性支持体21は開口を有することが好ましい。可撓性支持体21の開口の程度は、可撓性支持体21の表面において開口が占める面積の割合(以下、「開口率」という。)で判断することができる。加熱流体41の透過性を高める観点から、可撓性支持体21の開口率は30%以上が好ましく、40%以上がより好ましく、50%以上が更に好ましい。また、可撓性支持体21の強度を保つ観点から、可撓性支持体21の開口率は90%以下が好ましく、80%以下がより好ましく、70%以下が更に好ましい。
(Opening in flexible support)
The flexible support 21 may or may not have an opening. When the flexible support 21 does not have an opening, it is preferable to perform the fusion treatment by spraying the heated fluid 41 onto the heat-fusible web 11 in a state where the heat-fusible web 11 is sandwiched between the flexible support 21 and a net or the like (not shown) arranged so as to face the flexible support 21 in the nonwoven fabric fusion treatment step. In this way, the fusion treatment can be performed without destroying the shape of the shaped heat-fusible web 11.
However, from the viewpoint of passing the heating fluid 41 through in the nonwoven fabric fusion treatment process, it is preferable that the flexible support 21 has openings. The degree of openings in the flexible support 21 can be determined by the ratio of the area of the openings to the surface of the flexible support 21 (hereinafter referred to as the "opening ratio"). From the viewpoint of increasing the permeability of the heating fluid 41, the opening ratio of the flexible support 21 is preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more. Moreover, from the viewpoint of maintaining the strength of the flexible support 21, the opening ratio of the flexible support 21 is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less.

(可撓性支持体の形態)
このような開口率を有する可撓性支持体21の形態としては、ネット、チェーン、又は開口パンチングが挙げられる。これらいずれかの形態を採用することで、可撓性支持体21上で熱融着性ウェブ11の形状を固定しやすくするのと同時に、加熱流体41を貫通させやすくすることができる。開口率を大きくする観点からは、可撓性支持体21の形態としてはネットが好ましい。可撓性支持体21の強度を高める観点からは、可撓性支持体21の形態としては開口パンチングが好ましい。
(Form of flexible support)
Examples of the form of the flexible support 21 having such an opening ratio include a net, a chain, and an opening punching. By adopting any of these forms, it is possible to easily fix the shape of the heat-fusible web 11 on the flexible support 21 and at the same time to easily allow the heating fluid 41 to penetrate. From the viewpoint of increasing the opening ratio, the form of the flexible support 21 is preferably a net. From the viewpoint of increasing the strength of the flexible support 21, the form of the flexible support 21 is preferably an opening punching.

(可撓性支持体表面の凹凸形状)
可撓性支持体21の表面には、突起24を間欠的に設けることで、凹凸形状を形成することができる。突起24の形成方法には、種々のものを用いることができる。例えば、樹脂一体成型、鋳物、研削加工等により、可撓性支持体21の表面に突起24を形成することができる。これらの方法の場合、突起24は可撓性支持体21と一体化したものとなる。
また、表面が平坦な可撓性支持体21に、ネジ止め、ナット止め、リベット止め、スポット溶接、接着剤、グルーガン等で突起24を取り付けてもよい。取り付ける突起24の具体例としては、金属製の剣先ボルト、樹脂製の剣先ボルト、金属リベット、樹脂リベット等が挙げられる。
或いは、3Dプリンター等を用いて、可撓性支持体21の表面に突起24を形成してもよい。
(Irregular shape on the surface of the flexible support)
The surface of the flexible support 21 can be provided with projections 24 at intervals to form an uneven shape. The projections 24 can be formed by various methods. For example, a resin The protrusions 24 can be formed on the surface of the flexible support 21 by integral molding, casting, grinding, etc. In the case of these methods, the protrusions 24 become integrated with the flexible support 21. .
The protrusions 24 may be attached to the flat surface of the flexible support 21 by means of screws, nuts, rivets, spot welding, adhesives, glue guns, etc. Specific examples of the protrusions 24 to be attached include metal Examples of suitable rivets include steel pointed bolts, resin pointed bolts, metal rivets, and resin rivets.
Alternatively, the protrusions 24 may be formed on the surface of the flexible support 21 using a 3D printer or the like.

(押し込み部材)
押し込み部材31は、可撓性支持体21に噛み合い可能である。即ち、押し込み部材31を可撓性支持体21に対向するように配置させたときに、押し込み部材31の表面に存在する凹部や穴に突起24が入り込むことができる構造となっている。押し込み部材31が可撓性支持体21に噛み合い可能となっていることで、賦形工程で熱融着性ウェブ11を厚み方向に十分に押し込むことができ、不織布化融着処理工程では加熱流体41による過度な押し込みを防止できる。
押し込み部材31による押し込みは、可撓性支持体21の基材の位置まで厚み方向に行われることが好ましい。こうすることで、熱融着性ウェブ11において可撓性支持体21に接する側が密となり、製造される不織布10の表面の毛羽立ちを抑えることができる。更に、不織布化融着処理工程においても熱融着性ウェブ11は可撓性支持体21側へ押され、毛羽立ちは一層抑えられる。
(Push-in member)
The pushing member 31 can mesh with the flexible support 21. That is, when the pushing member 31 is disposed so as to face the flexible support 21, the protrusions 24 can enter recesses or holes present on the surface of the pushing member 31. Since the pushing member 31 can mesh with the flexible support 21, the heat-fusible web 11 can be sufficiently pushed in the thickness direction in the shaping step, and excessive pushing by the heated fluid 41 can be prevented in the nonwoven fabric fusion processing step.
It is preferable that the pushing member 31 pushes the web in the thickness direction up to the position of the base material of the flexible support 21. In this way, the side of the heat-fusible web 11 that contacts the flexible support 21 becomes dense, and it is possible to suppress fuzzing on the surface of the manufactured nonwoven fabric 10. Furthermore, in the nonwoven fabric fusion treatment step, the heat-fusible web 11 is also pushed toward the flexible support 21, further suppressing fuzzing.

(押し込み部材の形態)
可撓性支持体21に噛み合い可能な押し込み部材31の形態としては、リングロール、凹凸ロール、ネット、ベルト、チェーン、板ばね(弾性板状体)、又は可動式の荷重プレートが挙げられる。図1及び2では、押し込み部材31はリングロールの形態である。中でも、MD方向に不連続な凹凸形状に熱融着性ウェブ11を賦形することを可能とし、可撓性支持体21との噛み合い量の調整を容易とする観点から、凹凸ロールが好ましい。凹凸ロールの表面に凹凸形状を形成する方法としては、可撓性支持体21にて突起24を間欠的に設ける方法と同様に、凸部32を間欠的に設ける方法が挙げられる。
(Shape of Push-in Member)
Examples of the form of the pushing member 31 that can mesh with the flexible support 21 include a ring roll, a concave-convex roll, a net, a belt, a chain, a leaf spring (elastic plate-like body), or a movable load plate. In Figs. 1 and 2, the pushing member 31 is in the form of a ring roll. Among them, a concave-convex roll is preferred from the viewpoint of making it possible to shape the heat-fusible web 11 into a discontinuous concave-convex shape in the MD direction and facilitating adjustment of the amount of meshing with the flexible support 21. As a method for forming a concave-convex shape on the surface of the concave-convex roll, a method of intermittently providing convex portions 32 can be mentioned, similar to a method of intermittently providing protrusions 24 on the flexible support 21.

(押し込み部材の材質)
押し込み部材31は、樹脂若しくは金属、又はこれら両方からなることが好ましい。押し込み部材31を構成する樹脂及び金属の具体例は、可撓性支持体21で挙げたものと同様である。
(Material of the pushing member)
The pushing member 31 is preferably made of resin or metal, or both. Specific examples of the resin and metal constituting the pushing member 31 are the same as those given for the flexible support 21.

(連続接触及び間欠接触)
熱融着性ウェブ11は、可撓性支持体21及び押し込み部材31に対して、連続接触していてもよく、間欠接触していてもよい。接触の形態が連続接触に該当するか間欠接触に該当するかは、可撓性支持体21及び押し込み部材31で熱融着性ウェブ11を挟持していない状態であっても、噛み合い時における可撓性支持体21の突起24の頂部から押し込み部材31の凸部32の頂部までの厚み方向の距離(噛み合い量D)を用いて以下のように判断することができる(図3参照)。
(Continuous and intermittent contact)
The heat-fusible web 11 may be in continuous or intermittent contact with the flexible support 21 and the pushing member 31. Whether the type of contact corresponds to continuous or intermittent contact can be determined as follows using the distance in the thickness direction from the top of the protrusion 24 of the flexible support 21 to the top of the convex portion 32 of the pushing member 31 when they are engaged (meshing amount D) even when the heat-fusible web 11 is not sandwiched between the flexible support 21 and the pushing member 31 (see FIG. 3 ).

押し込み部材31側における「連続接触」は、突起24の頂部から可撓性支持体21に向かって、押し込み部材31の凸部32の頂部が一方向に途切れなく、噛み合い量Dの半分以上厚み方向に食い込んでいる状態を意味し、この状態にあるか否かで判断することができる。かかる状態で可撓性支持体21及び押し込み部材31が熱融着性ウェブ11を挟持すると、熱融着性ウェブ11と押し込み部材31とが連続的に接触する。例えば、押し込み部材31としてリングロールを採用した場合、熱融着性ウェブ11はMD方向に押し込み部材31と連続接触する。押し込み部材31の凸部32以外の部分については、押し込み部材31の凸部32,32間に空間があることで、熱融着性ウェブ11が押し込み部材31と接触しない場合と接触する場合とがある。
押し込み部材31側における「間欠接触」は、押し込み部材31の凸部32が噛み合い量Dの半分以上厚み方向に食い込む部分が、一方向において途切れる状態(押し込み部材31が食い込む程度が噛み合い量Dの半分未満となる部分が存在する状態)を意味し、この状態にあるか否かで判断することができる。かかる状態で可撓性支持体21及び押し込み部材31が熱融着性ウェブ11を挟持すると、熱融着性ウェブ11と押し込み部材31とが間欠的に接触する。例えば、押し込み部材31としてCD方向に連続した凸部を有するギアロールを採用した場合、押し込み部材31の凸部32の頂部がMD方向に途切れており、凸部32,32間の空間では食い込みの程度が噛み合い量Dの半分未満となるため、熱融着性ウェブ11はMD方向に押し込み部材31と間欠接触する。また、押し込み部材31としてリングロールを採用した場合は、熱融着性ウェブ11が押し込み部材31とMD方向に連続接触し、CD方向に間欠接触する(図3参照)。このようにすると、押し込み部材31が設定位置からCD方向にずれを生じて可撓性支持体21の突起24と接触した際に、損傷が軽減される点で好ましい。また、押し込み部材31として先端がギア状のリングロールを採用した場合は、熱融着性ウェブ11にはMD方向とCD方向との両方で押し込み部材31に間欠接触する。このようにすると、賦形後に熱融着性ウェブ11を押し込み部材31から離型する際に熱融着性ウェブ11が可撓性支持体21側に保持されやすくなり賦形状態を保つ点で好ましい。押し込み部材31の凸部32以外の部分については、連続接触の場合と同様である。
本発明では、熱融着性ウェブ11が押し込み部材31に対して、MD方向又はCD方向のどちらか一方に連続接触し、もう一方に間欠接触することが好ましい。
The "continuous contact" on the pushing member 31 side means a state in which the tops of the convex portions 32 of the pushing member 31 are continuously inserted in one direction from the tops of the projections 24 toward the flexible support 21 by more than half the meshing amount D in the thickness direction, and can be determined by whether or not this state is present. When the flexible support 21 and the pushing member 31 clamp the heat-sealable web 11 in this state, the heat-sealable web 11 and the pushing member 31 are in continuous contact. For example, when a ring roll is used as the pushing member 31, the heat-sealable web 11 is in continuous contact with the pushing member 31 in the MD direction. As for the portion other than the convex portions 32 of the pushing member 31, there is a space between the convex portions 32, 32 of the pushing member 31, so that the heat-sealable web 11 may or may not be in contact with the pushing member 31.
The "intermittent contact" on the pushing member 31 side means a state in which the protrusions 32 of the pushing member 31 bite into the thickness direction by more than half the meshing amount D, but are interrupted in one direction (a state in which there is a portion where the degree of the pushing member 31 bites into is less than half the meshing amount D), and it can be determined whether or not this state exists. When the flexible support 21 and the pushing member 31 clamp the heat-sealable web 11 in such a state, the heat-sealable web 11 and the pushing member 31 come into intermittent contact. For example, when a gear roll having convex portions continuous in the CD direction is used as the pushing member 31, the tops of the convex portions 32 of the pushing member 31 are interrupted in the MD direction, and the degree of bite into the space between the convex portions 32, 32 is less than half the meshing amount D, so that the heat-sealable web 11 comes into intermittent contact with the pushing member 31 in the MD direction. In addition, when a ring roll is used as the pushing member 31, the heat-sealable web 11 comes into continuous contact with the pushing member 31 in the MD direction and intermittently comes into contact with the pushing member 31 in the CD direction (see FIG. 3). This is preferable in that damage is reduced when the pushing member 31 shifts from the set position in the CD direction and comes into contact with the protrusions 24 of the flexible support 21. In addition, when a ring roll with a gear-shaped tip is used as the pushing member 31, the heat-sealable web 11 comes into intermittent contact with the pushing member 31 in both the MD direction and the CD direction. This is preferable in that the heat-sealable web 11 is easily held on the flexible support 21 side when the heat-sealable web 11 is released from the pushing member 31 after shaping, and the shaped state is maintained. The portions of the pushing member 31 other than the protrusions 32 are the same as in the case of continuous contact.
In the present invention, it is preferable that the heat-fusible web 11 be in continuous contact with the pushing member 31 in either the MD direction or the CD direction, and be in intermittent contact with the other direction.

可撓性支持体21側における「連続接触」は、凸部32の頂部から押し込み部材31に向かって、可撓性支持体21の突起24の頂部が一方向に途切れなく、噛み合い量Dの半分以上厚み方向に食い込んでいる状態を意味し、この状態にあるか否かで判断することができる。かかる状態で可撓性支持体21及び押し込み部材31が熱融着性ウェブ11を挟持すると、熱融着性ウェブ11と可撓性支持体21とが連続的に接触する。例えば、MD方向に連続した突起24を配置した可撓性支持体21を用いる場合、熱融着性ウェブ11はMD方向に可撓性支持体21と連続接触する。可撓性支持体21の突起24以外の部分については、可撓性支持体21の突起24,24間に空間があることで、熱融着性ウェブ11が可撓性支持体21と接触しない場合と接触する場合とがある。
可撓性支持体21側における「間欠接触」は、可撓性支持体21の突起24が噛み合い量Dの半分以上厚み方向に食い込む部分が、一方向において途切れる状態(押し込み部材31が食い込む程度が噛み合い量Dの半分未満となる部分が存在する状態)を意味し、この状態にあるか否かで判断することができる。かかる状態で可撓性支持体21及び押し込み部材31が熱融着性ウェブ11を挟持すると、熱融着性ウェブ11と可撓性支持体21とが間欠的に接触する。例えば、格子状に突起24を配置した可撓性支持体21を用いる場合、熱融着性ウェブ11はMD方向とCD方向の両方において可撓性支持体21と間欠接触する(図3参照)。可撓性支持体21の突起24の頂部以外の部分については、連続接触の場合と同様である。
本発明では、熱融着性ウェブ11が可撓性支持体21に対して、MD方向とCD方向の両方に間欠接触することが好ましい。
The "continuous contact" on the flexible support 21 side means a state in which the tops of the projections 24 of the flexible support 21 are continuously inserted in one direction from the tops of the convex portions 32 toward the pushing member 31 by more than half the meshing amount D in the thickness direction, and can be determined by whether or not this state is present. When the flexible support 21 and the pushing member 31 clamp the heat-sealable web 11 in this state, the heat-sealable web 11 and the flexible support 21 are in continuous contact with each other. For example, when a flexible support 21 having projections 24 arranged in the MD direction is used, the heat-sealable web 11 is in continuous contact with the flexible support 21 in the MD direction. As for the parts of the flexible support 21 other than the projections 24, there is a space between the projections 24, 24 of the flexible support 21, so that the heat-sealable web 11 may or may not be in contact with the flexible support 21.
The "intermittent contact" on the flexible support 21 side means a state in which the portion where the protrusions 24 of the flexible support 21 bite into the thickness direction by more than half the meshing amount D is interrupted in one direction (a state in which the degree to which the pushing member 31 bites into the flexible support 21 is less than half the meshing amount D), and it can be determined whether or not this state exists. When the flexible support 21 and the pushing member 31 clamp the heat-sealable web 11 in such a state, the heat-sealable web 11 and the flexible support 21 come into intermittent contact. For example, when a flexible support 21 with protrusions 24 arranged in a lattice shape is used, the heat-sealable web 11 comes into intermittent contact with the flexible support 21 in both the MD direction and the CD direction (see FIG. 3). The portions other than the tops of the protrusions 24 of the flexible support 21 are in the same state as in the case of continuous contact.
In the present invention, it is preferable that the heat-fusible web 11 is in intermittent contact with the flexible support 21 in both the MD and CD directions.

噛み合い量Dを、突起24の形状及び大きさに応じて適宜設定することで、熱融着性ウェブ11には賦形工程で孔を開けることができる。例えば、図1及び2に示すように突起24が円錐状の場合、突起24の底面の直径が2mmであれば噛み合い量Dを2mm以上とすることで、熱融着性ウェブ11に孔を開けることができる。また、図3に示すように突起24が円柱状の場合、突起24の頂部の直径が1.6mmであれば噛み合い量Dを3mm以上、突起24の頂部の直径が2mmであれば噛み合い量Dを5mm以上とすることで、熱融着性ウェブ11に孔を開けることができる。 By appropriately setting the meshing amount D according to the shape and size of the protrusions 24, holes can be made in the heat-sealable web 11 during the shaping process. For example, if the protrusions 24 are conical as shown in Figures 1 and 2, and the diameter of the base of the protrusions 24 is 2 mm, holes can be made in the heat-sealable web 11 by setting the meshing amount D to 2 mm or more. Also, if the protrusions 24 are cylindrical as shown in Figure 3, and the diameter of the top of the protrusions 24 is 1.6 mm, the meshing amount D can be 3 mm or more, and if the diameter of the top of the protrusions 24 is 2 mm, the meshing amount D can be 5 mm or more, to make holes in the heat-sealable web 11.

(位置合わせ)
可撓性支持体21は可撓性を有することから、不織布10の製造に長期間使用すること等により、MD方向に伸びたり、CD方向に縮んだりすることがある。その結果、押し込み部材31の凸部32の平面方向の位置が、突起24との噛み合いに最適な位置でなくなることがある。このような位置ずれを制御して適切な噛み合いを維持する観点から、賦形工程において、可撓性支持体21と押し込み部材31との位置合わせを平面方向において行うことが好ましい。
これらの位置合わせには、可撓性支持体21を平面方向に位置合わせする方法、及び押し込み部材31を平面方向に位置合わせする方法、並びにこれらを組み合わせる方法がある。平面方向の位置合わせは、可撓性支持体21及び押し込み部材31並びにこれら両方に対して、MD方向の調整機構による方法、及びCD方向の調整機構による方法、並びにこれら両方を行う方法がある。可撓性支持体21は可撓性であることに起因してMD方向に伸びたりCD方向に縮んだりしやすいため、噛み合い箇所における位置ずれが生じやすい。そのため、少なくとも可撓性支持体21に調整機構を設けることで、可撓性支持体21と押し込み部材31との平面方向の位置合わせを行うことが好ましい。
(Alignment)
Since the flexible support 21 has flexibility, it may expand in the MD direction and shrink in the CD direction due to long-term use in the manufacture of the nonwoven fabric 10. As a result, the planar position of the convex portion 32 of the pushing member 31 may no longer be optimal for meshing with the protrusion 24. From the viewpoint of controlling such misalignment and maintaining appropriate meshing, it is preferable to align the flexible support 21 with the pushing member 31 in the planar direction in the shaping step.
The alignment may be performed by aligning the flexible support 21 in the planar direction, by aligning the push-in member 31 in the planar direction, or by combining these methods. The alignment in the planar direction may be performed by using an adjustment mechanism in the MD direction for the flexible support 21 and the push-in member 31, or by using both of them, or by using an adjustment mechanism in the CD direction, or by performing both of them. Since the flexible support 21 is flexible and tends to expand in the MD direction and contract in the CD direction, misalignment is likely to occur at the meshing points. Therefore, it is preferable to align the flexible support 21 and the push-in member 31 in the planar direction by providing an adjustment mechanism at least for the flexible support 21.

可撓性支持体21の平面方向の位置合わせの一例としては、可撓性支持体21をドラム、チェーン、タイミングベルト等に固定し、画像やレーザー等を用いて突起24の位置を検出後、突起24が凸部32と噛み合うように押し込み部材31の平面方向の位置を合わせることが挙げられる。可撓性支持体21とドラム、チェーン、タイミングベルト等との固定位置は、可撓性支持体21の両サイド(可撓性支持体21のCD方向両端部)でもよく、MD方向に多列状であってもよい。また、可撓性支持体21の平面方向の位置合わせは、手動で行ってもよく、調整機構を用いて行ってもよい。MD方向の調整機構としては、ギアによる噛み合い駆動やMD方向の張力を調整する機構が挙げられる。CD方向の調整機構としては、可撓性支持体21のサイド固定部のCD位置を調整する機構や、可撓性支持体21の軸加熱による熱膨張等の調整機構が挙げられる。さらに、CD方向の蛇行修正装置やガイドロールに規制ガイド溝(又はレール)を設ける方法も挙げられる。
押し込み部材31の平面方向の位置合わせも、手動で行ってもよく、調整機構を用いて行ってもよい。MD方向の調整機構としては、ギアによる噛み合い駆動が挙げられる。CD方向の調整機構としては、押し込み部材31の軸加熱による熱膨張等の調整機構や、CD方向に移動するスプラインが挙げられる。中でも、突起24と押し込み部材31との衝突による力を軽減し、可撓性支持体21及び押し込み部材31の破損を防止する観点から、押し込み部材31の調整機構としてCD方向に移動するスプラインを用いることが好ましい。また、可撓性支持体21及び押し込み部材31の両方に調整機構を設けることが好ましく、その場合はCD方向の調整機構を双方に設けることがより好ましい。
但し、位置合わせの自動化の観点から、突起24の位置の検出結果を調整機構にフィードバックして位置合わせを行うことが好ましい。
An example of the planar alignment of the flexible support 21 is to fix the flexible support 21 to a drum, a chain, a timing belt, or the like, detect the position of the protrusion 24 using an image, a laser, or the like, and then align the planar position of the push-in member 31 so that the protrusion 24 meshes with the convex portion 32. The fixing positions of the flexible support 21 and the drum, chain, timing belt, or the like may be on both sides of the flexible support 21 (both ends of the flexible support 21 in the CD direction), or may be in multiple rows in the MD direction. The planar alignment of the flexible support 21 may be performed manually or by using an adjustment mechanism. Examples of the adjustment mechanism in the MD direction include a gear meshing drive and a mechanism for adjusting the tension in the MD direction. Examples of the adjustment mechanism in the CD direction include a mechanism for adjusting the CD position of the side fixing portion of the flexible support 21 and an adjustment mechanism for thermal expansion due to axial heating of the flexible support 21. Furthermore, a method of providing a regulating guide groove (or rail) on a meandering correction device in the CD direction or a guide roll may also be mentioned.
The positioning of the push-in member 31 in the planar direction may be performed manually or by using an adjustment mechanism. An example of an adjustment mechanism in the MD direction is a gear meshing drive. An example of an adjustment mechanism in the CD direction is an adjustment mechanism for thermal expansion of the push-in member 31 due to axial heating, or a spline that moves in the CD direction. Among them, from the viewpoint of reducing the force caused by the collision between the protrusion 24 and the push-in member 31 and preventing damage to the flexible support 21 and the push-in member 31, it is preferable to use a spline that moves in the CD direction as the adjustment mechanism for the push-in member 31. In addition, it is preferable to provide an adjustment mechanism in both the flexible support 21 and the push-in member 31, and in that case, it is more preferable to provide an adjustment mechanism in the CD direction in both.
However, from the viewpoint of automating the alignment, it is preferable to perform the alignment by feeding back the detection result of the position of the protrusion 24 to the adjustment mechanism.

(不織布の製造装置)
本発明の不織布の製造方法は、例えば図1及び2に示すような、不織布の製造装置にて実現することができる。具体的には、凹凸形状を有する可撓性支持体21と、可撓性支持体21に噛み合い可能な押し込み部材31と、可撓性支持体21上で熱融着性ウェブ11の融着処理が可能な加熱流体吹き付け機構とを有する不織布の製造装置にて、実現することができる。
加熱流体吹き付け機構としては、エアスルー機等、通常用いられるものを使用することができる。
(Nonwoven fabric manufacturing equipment)
The method for producing a nonwoven fabric of the present invention can be realized, for example, by a nonwoven fabric production apparatus as shown in Figures 1 and 2. Specifically, the method can be realized by a nonwoven fabric production apparatus having a flexible support 21 having an uneven shape, a pushing member 31 capable of engaging with the flexible support 21, and a heated fluid spraying mechanism capable of performing a fusion process on the heat-fusible web 11 on the flexible support 21.
As the heated fluid spraying mechanism, a commonly used mechanism such as an air-through machine can be used.

(不織布の用途)
前述の通り、本発明の不織布の製造方法は、厚みの大きな不織布を製造することができる。不織布の厚みを大きくすることで繊維間距離が増し、排泄液が不織布表面に残りにくくなる。更には、孔の開いた不織布とすることで、潰れても排泄液が戻りにくくなる。
従って、本発明によって製造される不織布は、吸収性物品に用いることが好ましい。吸収性物品としては、大人用や子供用のおむつ、生理用ナプキン、失禁パッド、パンティーライナー、吸収性パッド等が挙げられる。
(Applications of nonwoven fabric)
As described above, the method for producing a nonwoven fabric of the present invention can produce a thick nonwoven fabric. By increasing the thickness of the nonwoven fabric, the distance between fibers increases, making it difficult for excreted liquid to remain on the surface of the nonwoven fabric. Furthermore, by producing a nonwoven fabric with holes, excreted liquid is less likely to return even if the nonwoven fabric is crushed.
Therefore, the nonwoven fabric produced by the present invention is preferably used in absorbent articles, such as diapers for adults and children, sanitary napkins, incontinence pads, panty liners, absorbent pads, and the like.

以下、本発明を実施例に基づきさらに詳しく説明するが、本発明はこれにより限定して解釈されるものではない。 The present invention will be described in more detail below with reference to examples, but the present invention should not be construed as being limited thereto.

(実施例1)
カード機により上層(目付15g/m)と下層(目付15g/m)とからなる未融着の熱融着性ウェブを形成した。上層には、繊度が1.1dtex、繊維長が44mmで、親水性油剤が塗布された、芯鞘型(ポリエチレンテレフタレート(PET)(芯):ポリエチレン(PE)(鞘)=5:5(質量比))の同芯タイプの熱可塑性複合短繊維を用いた。下層には、繊度が3.3dtexであること以外は上層の構成繊維と同様の、熱可塑性複合短繊維を用いた。
線ピッチ1.7mm、線直径0.5mmのポリエステル平織メッシュに、突起として高さ9mmのM2ボルトをナット止めにより複数固定した可撓性支持体と、押し込み部材として複数のリングがCD方向に並んだリングロールとを用いて、上記の熱融着性ウェブを噛み合い賦形した。なお、可撓性支持体におけるM2ボルトは、MD方向及びCD方向に5.1mmピッチの格子間隔で複数設ける配置とした。噛み合い賦形の際、上層ウェブを可撓性支持体に、下層ウェブをリングロールに、それぞれ接触させ、噛み合い量(押し込み深さ)を6mmとして、M2ボルトによってリングロールを押し込みながら熱融着性ウェブを貫通させ、熱融着性ウェブに凹凸形状を形成した。
上記の賦形工程の後、不織布化融着処理工程として、可撓性支持体21上で下層ウェブ側から温度136℃の熱風を、風速1.5m/秒、吹き付け時間1秒にて吹き付け、熱融着性ウェブの構成繊維同士の交点を融着した。
熱融着性ウェブを可撓性支持体から剥離した後、毛羽防止のための追加融着処理工程として、フラットコンベアネット上で熱融着性ウェブの下層ウェブ側から温度136℃の熱風を、風速0.5m/秒、吹き付け時間6秒にて吹き付け、実施例1の不織布を製造した。実施例1の不織布では、厚み方向に貫通する孔を形成した。
賦形工程の際、熱風による可撓性支持体の熱膨張によってCD方向に支持体とリングロールとの位置ずれが生じたが、可撓性支持体とリングロールとの擦れによるM2ボルトの損傷や熱融着性ウェブの切れは見られなかった。
Example 1
An unfused heat-fusible web consisting of an upper layer (basis weight 15 g/ m2 ) and a lower layer (basis weight 15 g/ m2 ) was formed using a carding machine. The upper layer used concentric thermoplastic composite short fibers of a core-sheath type (polyethylene terephthalate (PET) (core): polyethylene (PE) (sheath) = 5:5 (mass ratio)) with a fineness of 1.1 dtex, fiber length of 44 mm, and coated with a hydrophilic oil agent. The lower layer used thermoplastic composite short fibers similar to the constituent fibers of the upper layer except that the fineness was 3.3 dtex.
The above heat-sealable web was meshed and shaped using a flexible support in which a plurality of M2 bolts with a height of 9 mm were fixed as protrusions to a polyester plain weave mesh with a line pitch of 1.7 mm and a line diameter of 0.5 mm by nuts, and a ring roll in which a plurality of rings were arranged in the CD direction as a pressing member. The M2 bolts in the flexible support were arranged in a plurality of positions with a lattice interval of 5.1 mm in the MD and CD directions. When meshing and shaping, the upper layer web was contacted with the flexible support and the lower layer web with the ring roll, respectively, and the meshing amount (pressing depth) was set to 6 mm, and the M2 bolt was pressed into the ring roll to penetrate the heat-sealable web, forming an uneven shape on the heat-sealable web.
After the above-mentioned shaping process, as a nonwoven fabric fusion processing process, hot air at a temperature of 136°C was blown onto the lower web side of the flexible support 21 at a wind speed of 1.5 m/sec for a blowing time of 1 second to fuse the intersections between the constituent fibers of the heat-sealable web.
After the heat-sealable web was peeled off from the flexible support, as an additional fusion treatment step to prevent fuzzing, hot air at a temperature of 136° C. was blown onto the lower web side of the heat-sealable web on a flat conveyor net at a wind speed of 0.5 m/sec for a blowing time of 6 seconds to produce the nonwoven fabric of Example 1. In the nonwoven fabric of Example 1, holes penetrating in the thickness direction were formed.
During the shaping process, thermal expansion of the flexible support by hot air caused a misalignment between the support and the ring roll in the CD direction, but no damage to the M2 bolts or cuts in the heat-sealable web due to friction between the flexible support and the ring roll were observed.

(実施例2)
M2ボルトの高さを6mmとし、上層のみを賦形工程に供した後に下層を積層して不織布化融着処理工程に供した以外は、実施例1と同様にして、実施例2の不織布を製造した。実施例2の不織布では、上層で厚み方向に窪み、下層で遮蔽された孔を形成した。
賦形工程の際、可撓性支持体とリングロールとの擦れによるM2ボルトの損傷や熱融着性ウェブの切れは見られなかった。
Example 2
The nonwoven fabric of Example 2 was produced in the same manner as in Example 1, except that the height of the M2 bolt was set to 6 mm, and only the upper layer was subjected to the shaping process, and then the lower layer was laminated and subjected to the nonwoven fabric fusion treatment process. In the nonwoven fabric of Example 2, holes were formed in the upper layer that were recessed in the thickness direction and blocked by the lower layer.
During the shaping process, no damage to the M2 bolts or breakage of the heat-sealable web due to friction between the flexible support and the ring roll was observed.

(実施例3)
M2ボルトをポリエステル平織メッシュにナット止めせずにメッシュの隙間に挟持した以外は、実施例1と同様にして、実施例3の不織布を製造した。実施例3の不織布では、厚み方向に貫通する孔を形成した。
賦形工程の際、可撓性支持体とリングロールとの擦れによるM2ボルトの損傷や熱融着性ウェブの切れは見られなかった。
Example 3
The nonwoven fabric of Example 3 was produced in the same manner as in Example 1, except that the M2 bolts were clamped between the gaps in the polyester plain weave mesh without being fastened with nuts. In the nonwoven fabric of Example 3, holes were formed penetrating through the thickness direction.
During the shaping process, no damage to the M2 bolts or breakage of the heat-sealable web due to friction between the flexible support and the ring roll was observed.

(実施例4)
M2ボルトに代えて高さ15mmのM1.6ボルトを用いた以外は、実施例3と同様にして、実施例4の不織布を製造した。実施例4の不織布では、厚み方向に貫通する孔を形成した。
賦形工程の際、可撓性支持体とリングロールとの擦れによるM1.6ボルトの損傷や熱融着性ウェブの切れは見られなかった。
Example 4
A nonwoven fabric of Example 4 was produced in the same manner as in Example 3, except that M1.6 bolts having a height of 15 mm were used instead of the M2 bolts. In the nonwoven fabric of Example 4, holes were formed penetrating through the fabric in the thickness direction.
During the shaping process, no damage to the M1.6 bolts or breakage of the heat-sealable web due to friction between the flexible support and the ring roll was observed.

(実施例5)
ポリエステル平織メッシュに代えてステンレス平織メッシュを用いた以外は、実施例4と同様にして、実施例5の不織布を製造した。実施例5の不織布では、厚み方向に貫通する孔を形成した。
賦形工程の際、可撓性支持体とリングロールとの擦れによるM1.6ボルトの損傷や熱融着性ウェブの切れは見られなかった。
Example 5
Except for using a stainless steel plain weave mesh instead of the polyester plain weave mesh, the nonwoven fabric of Example 5 was produced in the same manner as in Example 4. In the nonwoven fabric of Example 5, holes penetrating in the thickness direction were formed.
During the shaping process, no damage to the M1.6 bolts or breakage of the heat-sealable web due to friction between the flexible support and the ring roll was observed.

(比較例1)
可撓性支持体の代わりに、突起として高さ8mmの2mm角柱が一体成型されたアルミニウム合金を非可撓性の支持体として用いた以外は、実施例1と同様にして、比較例1の不織布を製造した。比較例1の不織布では、上層、下層ともに厚み方向に窪みを有し、凹部が形成された不織布が得られた。
賦形工程の際、熱風による非可撓性支持体の熱膨張によってCD方向に支持体とリングロールとの位置ずれが生じ、非可撓性の支持体とリングロールとの擦れによる2mm角柱の損傷や熱融着性ウェブの切れが見られた。
(Comparative Example 1)
A nonwoven fabric of Comparative Example 1 was produced in the same manner as in Example 1, except that an aluminum alloy with integrally molded 2 mm square columns with a height of 8 mm as protrusions was used as a non-flexible support instead of a flexible support. In the nonwoven fabric of Comparative Example 1, both the upper and lower layers had depressions in the thickness direction, and a nonwoven fabric with recesses was obtained.
During the shaping process, thermal expansion of the non-flexible support by hot air caused a misalignment between the support and the ring roll in the CD direction, and damage to the 2 mm square pillars and breakage of the heat-sealable web were observed due to friction between the non-flexible support and the ring roll.

(突起の変形量の測定)
実施例1~5及び比較例1で用いた支持体について、前述の方法に従い、突起の変形量を測定した。
結果を表1に示す。
(Measurement of deformation of protrusion)
For the supports used in Examples 1 to 5 and Comparative Example 1, the deformation amounts of the protrusions were measured according to the above-mentioned method.
The results are shown in Table 1.

Figure 0007556752000001
Figure 0007556752000001

表1に示すように、可撓性支持体を用いた実施例1~5では、非可撓性の支持体を用いた比較例1と比べて、いずれも突起の変形量が大きく、突起が破損しにくいものであった。
また、実施例1~5の中では、突起の高さが大きいほど突起の変形量が大きい傾向にあり、突起の破損が一層しにくいものであった。
更に、突起をナット止めにより固定した実施例1及び2よりも、突起をメッシュの隙間に挟持した実施例3~5において、突起の移動の自由度が高かったが故に突起の変形量は大きく、破損しにくいものであった。
加えて、実施例4及び5では、金属製のメッシュを用いた実施例5よりも、ポリエステル製のメッシュを用いた実施例4において、突起の変形量が大きく、剛性が低い材質を可撓性支持体に用いることで突起がより一層破損しにくくなる傾向にあった。
As shown in Table 1, in Examples 1 to 5 in which a flexible support was used, the deformation of the protrusions was greater and the protrusions were less likely to break than in Comparative Example 1 in which a non-flexible support was used.
Furthermore, among Examples 1 to 5, there was a tendency that the greater the height of the projection, the greater the amount of deformation of the projection, and the more unlikely the projection was to be damaged.
Furthermore, in Examples 3 to 5, in which the protrusions were clamped between the gaps in the mesh, the protrusions had a higher degree of freedom of movement, so the amount of deformation of the protrusions was larger and they were less likely to break than in Examples 1 and 2, in which the protrusions were fixed by nuts.
In addition, in Examples 4 and 5, the deformation of the protrusions was greater in Example 4, which used a polyester mesh, than in Example 5, which used a metal mesh, and the use of a material with low rigidity for the flexible support tended to make the protrusions even less susceptible to damage.

10 不織布
11 熱融着性ウェブ
21 可撓性支持体
22 ロール
23 ドラム
24 突起
31 押し込み部材
32 凸部
41 加熱流体
42 流体
D 噛み合い量
REFERENCE SIGNS LIST 10 Nonwoven fabric 11 Heat-sealable web 21 Flexible support 22 Roll 23 Drum 24 Protrusion 31 Push-in member 32 Convex portion 41 Heated fluid 42 Fluid D Amount of meshing

Claims (7)

凹凸形状を有する可撓性支持体と、該可撓性支持体に噛み合い可能な押し込み部材とにより、熱融着性ウェブを挟持して賦形する工程と、
前記熱融着性ウェブを前記可撓性支持体上で加熱流体により融着処理する工程とを有
前記可撓性支持体は、表面に間欠的に突起が形成されおり、前記押し込み部材は、表面に前記突起が入り込むことができる凹部又は穴を有する、不織布の製造方法。
A step of sandwiching and shaping a heat-fusible web between a flexible support having an uneven shape and a pushing member capable of engaging with the flexible support;
and fusing the heat-sealable web on the flexible support with a heated fluid,
A method for producing a nonwoven fabric , wherein the flexible support has protrusions intermittently formed on a surface thereof, and the pushing member has recesses or holes on its surface into which the protrusions can enter .
前記可撓性支持体が樹脂若しくは金属、又はこれら両方からなり、ネット、又は開口パンチングシートである、請求項1記載の不織布の製造方法。 The method for producing a nonwoven fabric according to claim 1, wherein the flexible support is made of a resin or a metal, or both, and is a net or an apertured punched sheet. 前記押し込み部材が樹脂若しくは金属、又はこれら両方からなり、凹凸ロール、ネット、ベルト、板ばね、又はプレートである、請求項1又は2記載の不織布の製造方法。 The method for producing a nonwoven fabric according to claim 1 or 2, wherein the pushing member is made of resin or metal, or both, and is a concave-convex roll, a net, a belt , a leaf spring, or a plate. 前記熱融着性ウェブに孔を開ける、請求項1~3のいずれか1項に記載の不織布の製造方法。 The method for producing a nonwoven fabric according to any one of claims 1 to 3, wherein holes are formed in the heat-sealable web. 前記加熱流体の風速が10m/秒以下である、請求項1~4のいずれか1項に記載の不織布の製造方法。 The method for producing a nonwoven fabric according to any one of claims 1 to 4, wherein the wind speed of the heated fluid is 10 m/sec or less. 前記可撓性支持体と前記押し込み部材との位置合わせを平面方向において行う、請求項1~5のいずれか1項に記載の不織布の製造方法。 The method for producing a nonwoven fabric according to any one of claims 1 to 5, in which the flexible support and the pushing member are aligned in a planar direction. 凹凸形状を有する可撓性支持体と、該可撓性支持体に噛み合い可能な押し込み部材と、該可撓性支持体上で熱融着性ウェブの融着処理が可能な加熱流体吹き付け機構とを有する、不織布の製造装置。 A nonwoven fabric manufacturing device having a flexible support having an uneven shape, a pushing member that can engage with the flexible support, and a heated fluid spraying mechanism that can perform a heat-sealing process on the flexible support.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008112517A1 (en) 2007-03-13 2008-09-18 The Procter & Gamble Company Method and apparatus for incrementally stretching a web
JP2009153556A (en) 2007-12-25 2009-07-16 Kao Corp Absorbent articles
JP2019112747A (en) 2017-12-26 2019-07-11 花王株式会社 Method of manufacturing nonwoven fabric
JP2019208712A (en) 2018-06-01 2019-12-12 花王株式会社 Absorbent article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008112517A1 (en) 2007-03-13 2008-09-18 The Procter & Gamble Company Method and apparatus for incrementally stretching a web
JP2009153556A (en) 2007-12-25 2009-07-16 Kao Corp Absorbent articles
JP2019112747A (en) 2017-12-26 2019-07-11 花王株式会社 Method of manufacturing nonwoven fabric
JP2019208712A (en) 2018-06-01 2019-12-12 花王株式会社 Absorbent article

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