JP3679966B2

JP3679966B2 - Method and apparatus for dividing elastic elastic member

Info

Publication number: JP3679966B2
Application number: JP2000074679A
Authority: JP
Inventors: 定直真鍋
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2000-03-16
Filing date: 2000-03-16
Publication date: 2005-08-03
Anticipated expiration: 2020-03-16
Also published as: JP2001261207A

Description

【０００１】
【発明の属する技術分野】
本発明は、弾性伸縮部材の分線方法とその装置に関する。
【０００２】
【従来の技術】
吸収性物品、たとえば使い捨て紙おむつにおいては、脚周りのガスケットカフス用やバリヤーカフス用の弾性伸縮部材、腰周り弾性伸縮部材、腹周り弾性伸縮部材を設けることが行われている。
【０００３】
これらの弾性伸縮部材は、幅方向左右、長手方向前後に振り分けること、さらに各部位において複数本の弾性伸縮部材を取り付けることが必要となることなどの理由により、扁平の親弾性伸縮部材を幅方向に複数の単位弾性伸縮部材に分離して、製品素材に取り付けることが知られている。
【０００４】
この分線方法として、特公平１−４４８０１号公報（特許第１５７８３６２号）に開示のものがある。この方法は、糸状ゴム材に分離する前に、弾性伸縮部材を平ベルト状形態のままで所望倍率に伸長するものである。
【０００５】
【発明が解決しようとする課題】
しかし、従来の方法では、操業に先立ち、手作業で各糸状ゴム材に分離し、これらを分離ガイドに糸通しする作業が必要となり煩雑であるとともに、操業中に分離ガイド部分の存在により糸切れが発生し易い。
【０００６】
また、各糸状ゴム材に分離した後に、若干のテンションが作用し、このテンションが各糸通しライン上で相違する傾向が高いので、最終的に得られる製品において均一なテンションとなり難い。
【０００７】
さらに、糸状ゴム材に分離する前に、弾性伸縮部材を平ベルト状形態のまま伸長する過程で、ゴム材表面にブロキング防止のために付着させる炭酸カルシウムなどの粉が広範囲に飛散する。
【０００８】
したがって、本発明の課題は、分離ガイドに糸通しする作業を不要とし、糸切れ発生を抑制し、さらに最終的に得られる製品において均一なテンションとなり、しかも粉の広範囲に飛散がない弾性伸縮部材の分線方法とその装置を提供することにある。
【０００９】
【課題を解決するための手段】
＜請求項１記載の発明＞
扁平の親弾性伸縮部材を幅方向に複数の単位弾性伸縮部材に分離して、製品素材に取り付けるに際して、
ロール表面が相互に接触するように配設された対の第１ニップロールと、ロール表面が相互に接触するように配設された対の第２ニップロールとをライン流れ方向に離間配設しておき、前記第１ニップロールの各ロールに接触してターニングロールをそれぞれ設け、
前記親弾性伸縮部材を第１ニップロール間に実質的に非伸長状態で供給し、前記第１ニップロール間に供給される前の親弾性伸縮部材の非伸張状態は維持しつつ、
前記第１ニップロール間の出側において、前記親弾性伸縮部材の幅方向に関して交互に、一方の単位弾性伸縮部材は、前記第１ニップロールの一方のロール周面を巡った後に対向するターニングロールを巡らし、他方の単位弾性伸縮部材は、前記第１ニップロールの他方のロール周面を巡った後に対向するターニングロールを巡らし、
各単位弾性伸縮部材群を前記第１ニップロールのニップ位置より下流側から引いて、前記第１ニップロールのニップ位置を分離開始位置として、個々の単位弾性伸縮部材に分線するとともに、
この分線が終わった個々の単位弾性伸縮部材を下流の前記第２ニップロール間を通し、前記第１ニップロールの周速より前記第２ニップロールの周速を速めて、前記第１ニップロールから前記第２ニップロールへの間において、個々の単位弾性伸縮部材を所望倍率に伸長することを特徴とする弾性伸縮部材の分線方法。
【００１０】
＜請求項２記載の発明＞
扁平の親弾性伸縮部材を幅方向に複数の単位弾性伸縮部材に分離して、製品素材に取り付ける装置において、
ロール表面が相互に接触するように配設された対の第１ニップロールと、ロール表面が相互に接触するように配設された対の第２ニップロールとをライン流れ方向に離間配設しておき、
前記第１ニップロールの各ロールに接触してターニングロールをそれぞれ設け、
これらのターニングロールから前記第２ニップロールとの間にガイド手段を設けないで自由区間とし、
前記親弾性伸縮部材を第１ニップロール間に実質的に非伸長状態で供給し、前記第１ニップロール間に供給される前の親弾性伸縮部材の非伸張状態は維持しつつ、
前記第１ニップロール間の出側において、前記親弾性伸縮部材の幅方向に関して交互に、一方の単位弾性伸縮部材は、前記第１ニップロールの一方のロール周面を巡った後に対向するターニングロールを巡らし、他方の単位弾性伸縮部材は、前記第１ニップロールの他方のロール周面を巡った後に対向するターニングロールを巡らし、
各単位弾性伸縮部材群を前記第１ニップロールのニップ位置より下流側から引いて、前記第１ニップロールのニップ位置を分離開始位置として、個々の単位弾性伸縮部材に分線しつつ、前記第２ニップロール間に導くように構成し、
前記第１ニップロールの周速より前記第２ニップロールの周速を速めて、前記第１ニップロールから前記第２ニップロールへの間において個々の単位弾性伸縮部材を所望倍率に伸長する構成としたことを特徴とする弾性伸縮部材の分線装置。
【００１１】
（作用効果）
第１ニップロール間の出側において個々の単位弾性伸縮部材に分線するとともに、この分線が終わった個々の単位弾性伸縮部材を、たとえば下流の前記第２ニップロール間を通し、前記第１ニップロールの周速より前記第２ニップロールの周速を速めて、前記第１ニップロールから前記第２ニップロールへの間において、個々の単位弾性伸縮部材を所望倍率に伸長するので、分離ガイドに糸通しする作業が不要となり、分離ガイドの設置が不要となり、これにより糸切れ発生を抑制できる。さらに最終的に得られる製品において均一なテンションとなる。また、親弾性伸縮部材を第１ニップロール間に実質的に非伸長状態で供給するので、この間の領域における広範囲にわたる粉の飛散がなくなり、飛散があるとしても第１ニップロールのニップ位置近傍であるから、たとえばバキュームをきかせて飛散防止対策を容易に採用することができる。
【００１２】
しかも、分線位置が第１ニップロール位置で固定であるために、従来例のように、操業中において分線位置がパスライン方向にずれることにより、テンションが変動することがない。他方で、本発明では分線と伸長を同時的に行うので、分離ガイドの設置が不要となりほかに、パスラインを短くすることも可能である。
【００１３】
【発明の実施の形態】
以下本発明の実施の形態を図面を参照しながらさらに詳説する。
扁平のたとえばゴムからなる親弾性伸縮部材１を幅方向に複数の単位弾性伸縮部材１Ａ，１Ａ…に分離して、これを使い捨て紙おむつなどの製品素材に取り付けるにために本発明が適用される。
【００１４】
このために、対の第１ニップロール１０，１０と、対の第２ニップロール２０，２０とをライン流れ方向に離間配設しておく。さらに、第１ニップロール１０，１０のニップ位置より回転方向下流側に各ロール１０，１０に接触してターニングロール３０，３０をそれぞれ設け、このターニングロール３０，３０に個々の単位弾性伸縮部材１Ａ，１Ａ…を巡らせた後、第２ニップロール２０，２０間に導くように構成する。
【００１５】
そして、第１ニップロール１０，１０のニップ位置を、図３に明示されているように、親弾性伸縮部材１から単位弾性伸縮部材１Ａ，１Ａ…への分離開始位置とする。
【００１６】
そして、親弾性伸縮部材１を第１ニップロール１０，１０間に実質的に非伸長状態で供給し、第１ニップロール１０，１０間の出側において個々の単位弾性伸縮部材に分線するとともに、この分線が終わった個々の単位弾性伸縮部材を下流の前記第２ニップロール間を通すが、このとき第１ニップロール１０，１０の周速より前記第２ニップロール２０，２０の周速を速めることにより、第１ニップロール１０，１０から第２ニップロール２０，２０への間において、個々の単位弾性伸縮部材１Ａ，１Ａ…を所望倍率に伸長するものである。
【００１７】
特に、ターニングロール３０，３０から第２ニップロール２０，２０との間をガイド手段を設けないで自由区間とするのが好適である。
【００１８】
第２ニップロール２０，２０を通った単位弾性伸縮部材１Ａ，１Ａ…は、所定のラインを経た上で、使い捨て紙おむつなどの製品素材に、たとえばホットメルト接着剤などにより取り付けられる。
【００１９】
本発明の弾性伸縮部材としては、天然ゴムなどのゴム材料のほか、ウレタンなどの合成樹脂発泡体などの各種弾性伸縮部材について適用可能である。親弾性伸縮部材の状態で、予め前記公報に記載のように厚みが薄いたとえばライン方向に沿う分離線を形成しておくこともできる。図示の形態では、単位弾性伸縮部材１Ａの横断面形状は、ほぼ扁平四角形であるが、たとえば前記公報記載例のようにほぼ円形のものなど、目的に応じて横断面形状は適宜選択できる。
【００２０】
一方、ニップロールをタンデムに多段に設けることもできる。この場合、下流のニップロールほど周速を速めて順次伸長倍率を高める必要がある。
【００２１】
他方、図３に示すように、途中にニップロールを設けることなく、最終の張り合わせロール４０まで単位弾性伸縮部材１Ａ，１Ａ…を導き、その貼り合わせロール４０を周速を第１ニップロール１０，１０の周速より速めることで、目的の伸長倍率に伸長できるようにしてもよい。５０は第２ターニングロールであり、６０は対象の貼り合わせ素材である。
【００２２】
ターニングロール３０は第１ニップロール１０に接触している。第２ターニングロール５０は、貼り合わせロール４０に接触していてもよいし、離れていてもよい。ターニングロール５０に代えて、適宜の方向変え手段を用いることもできる。
【００２３】
【発明の効果】
以上のとおり、本発明によれば、分離ガイドに糸通しする作業が不要となり、糸切れ発生が抑制され、さらに最終的に得られる製品において均一なテンションとなり、しかも粉の広範囲に飛散がないなどの利点がもたらされる。
【図面の簡単な説明】
【図１】本発明のライン構成を示す概要図である。
【図２】分線形態を示す斜視図である。
【図３】本発明の他の例のライン構成を示す概要図である。
【符号の説明】
１…親弾性伸縮部材、１Ａ…単位弾性伸縮部材、１０…第１ニップロール、２０…第２ニップロール、３０…ターニングロール。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for dividing elastic elastic members.
[0002]
[Prior art]
In an absorbent article, for example, disposable paper diapers, an elastic elastic member for a gasket cuff or a barrier cuff around a leg, an elastic elastic member around a waist, and an elastic elastic member around an abdomen are provided.
[0003]
These elastic elastic members are divided into flat elastic elastic members in the width direction for the reason that it is necessary to distribute them in the width direction left and right, longitudinal direction front and back, and to attach a plurality of elastic elastic members in each part. It is known that a plurality of unit elastic elastic members are separated and attached to a product material.
[0004]
As a method of this branching, there is one disclosed in Japanese Patent Publication No. 1-444801 (Japanese Patent No. 1578362). In this method, the elastic elastic member is stretched to a desired magnification in the form of a flat belt before being separated into the thread rubber material.
[0005]
[Problems to be solved by the invention]
However, in the conventional method, it is necessary to manually separate the respective rubber thread materials before threading them and thread them through a separation guide. Is likely to occur.
[0006]
Further, after the separation into the respective thread-like rubber materials, a slight tension acts, and this tension tends to be different on each threading line, so that it is difficult to obtain a uniform tension in the finally obtained product.
[0007]
Furthermore, before separating into the thread-like rubber material, in the process of extending the elastic elastic member in the form of a flat belt, powder such as calcium carbonate adhered to the rubber material surface to prevent blocking is scattered over a wide range.
[0008]
Accordingly, an object of the present invention is to eliminate the need for threading through a separation guide, suppress the occurrence of thread breakage, and provide a uniform tension in the finally obtained product, and further, there is no scattering of powder over a wide range. It is in providing a method and apparatus for the same.
[0009]
[Means for Solving the Problems]
<Invention of Claim 1>
When the flat elastic elastic member is separated into a plurality of unit elastic members in the width direction and attached to the product material,
A pair of first nip rolls arranged so that the roll surfaces are in contact with each other and a pair of second nip rolls arranged so that the roll surfaces are in contact with each other are spaced apart in the line flow direction. Each of the first nip rolls is in contact with each roll, and a turning roll is provided
Supplying the elastic elastic member in a substantially non-extended state between the first nip rolls, while maintaining the non-extended state of the elastic elastic member before being supplied between the first nip rolls,
On the exit side between the first nip rolls , one unit elastic elastic member alternates with respect to the turning rolls facing each other after going around one roll peripheral surface of the first nip roll alternately in the width direction of the elastic elastic member. The other unit elastic elastic member goes around the opposite turning roll after going around the other roll peripheral surface of the first nip roll,
Pull each unit elastic stretchable member group from the downstream side of the nip position of the first nip roll, and use the nip position of the first nip roll as a separation start position to split each unit elastic stretchable member,
The individual elastic elastic members for which the segmentation has been completed are passed between the second nip rolls downstream, the peripheral speed of the second nip roll is increased from the peripheral speed of the first nip roll, and the second nip roll extends from the first nip roll to the second nip roll. A method for separating elastic elastic members, wherein each unit elastic elastic member is stretched to a desired magnification between the nip rolls.
[0010]
<Invention of Claim 2>
In a device that separates a flat elastic elastic member into a plurality of unit elastic members in the width direction and attaches them to a product material,
A pair of first nip rolls arranged so that the roll surfaces are in contact with each other and a pair of second nip rolls arranged so that the roll surfaces are in contact with each other are spaced apart in the line flow direction. ,
A turning roll is provided in contact with each roll of the first nip roll ,
Without providing a guide means between these turning rolls and the second nip roll, it is a free section,
Supplying the elastic elastic member in a substantially non-extended state between the first nip rolls, while maintaining the non-extended state of the elastic elastic member before being supplied between the first nip rolls,
On the exit side between the first nip rolls , one unit elastic elastic member alternates with respect to the turning rolls facing each other after going around one roll peripheral surface of the first nip roll alternately in the width direction of the elastic elastic member. The other unit elastic elastic member goes around the opposite turning roll after going around the other roll peripheral surface of the first nip roll,
Each unit elastic elastic member group is pulled from the downstream side of the nip position of the first nip roll, and the second nip roll is separated from each unit elastic elastic member with the nip position of the first nip roll as a separation start position. Configured to lead in between,
The peripheral speed of the second nip roll is increased from the peripheral speed of the first nip roll, and each unit elastic elastic member is extended to a desired magnification between the first nip roll and the second nip roll. An apparatus for separating elastic elastic members.
[0011]
(Function and effect)
The unit elastic elastic members are separated from each other on the exit side between the first nip rolls, and the individual unit elastic elastic members that have undergone the division are passed through, for example, the second nip rolls downstream of the first nip rolls. Since the peripheral speed of the second nip roll is increased from the peripheral speed and each unit elastic elastic member is stretched to a desired magnification between the first nip roll and the second nip roll, the operation of threading the separation guide is performed. There is no need to install a separation guide, which can suppress yarn breakage. Furthermore, it becomes a uniform tension in the final product. In addition, since the elastic elastic member is supplied in a substantially non-extended state between the first nip rolls, there is no powder scattering over a wide range in the region between them, and even if there is scattering, it is near the nip position of the first nip roll. For example, it is possible to easily adopt anti-scattering measures by using vacuum.
[0012]
In addition, since the dividing line position is fixed at the first nip roll position, the tension does not fluctuate when the dividing line position is shifted in the pass line direction during operation as in the conventional example. On the other hand, in the present invention, since the branching and the extension are performed simultaneously, it is not necessary to install a separation guide, and the pass line can be shortened.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
The present invention is applied to divide a flat elastic elastic member 1 made of rubber, for example, into a plurality of unit elastic elastic members 1A, 1A... In the width direction and attach them to a product material such as a disposable paper diaper.
[0014]
For this purpose, the pair of first nip rolls 10 and 10 and the pair of second nip rolls 20 and 20 are spaced apart in the line flow direction. Further, turning rolls 30 and 30 are provided in contact with the respective rolls 10 and 10 on the downstream side in the rotational direction from the nip position of the first nip rolls 10 and 10, respectively. 1A... Is arranged so as to be guided between the second nip rolls 20 and 20.
[0015]
And the nip position of the 1st nip rolls 10 and 10 is made into the separation start position from the main elastic elastic member 1 to unit elastic elastic member 1A, 1A ... as clearly shown in FIG.
[0016]
Then, the elastic elastic member 1 is supplied between the first nip rolls 10 and 10 in a substantially non-extended state, and is divided into individual unit elastic elastic members on the exit side between the first nip rolls 10 and 10. The individual elastic elastic members that have been separated are passed between the second nip rolls downstream, and at this time, by increasing the peripheral speed of the second nip rolls 20, 20 from the peripheral speed of the first nip rolls 10, 10, Between the first nip rolls 10 and 10 and the second nip rolls 20 and 20, the individual elastic elastic members 1A, 1A.
[0017]
In particular, it is preferable to set a free section between the turning rolls 30 and 30 and the second nip rolls 20 and 20 without providing guide means.
[0018]
The unit elastic elastic members 1A, 1A... That have passed through the second nip rolls 20, 20 are attached to a product material such as a disposable paper diaper after passing through a predetermined line, for example, with a hot melt adhesive.
[0019]
The elastic elastic member of the present invention can be applied to various elastic elastic members such as a synthetic resin foam such as urethane in addition to a rubber material such as natural rubber. In the state of the elastic elastic member, a separation line having a small thickness, for example, along the line direction can be formed in advance as described in the above publication. In the illustrated form, the cross-sectional shape of the unit elastic elastic member 1A is a substantially flat quadrangle, but the cross-sectional shape can be appropriately selected according to the purpose, for example, a substantially circular shape as in the above-mentioned publication example.
[0020]
On the other hand, nip rolls can be provided in multiple stages in tandem. In this case, it is necessary to increase the expansion ratio sequentially by increasing the peripheral speed of the downstream nip roll.
[0021]
On the other hand, as shown in FIG. 3, without providing a nip roll in the middle, the unit elastic elastic members 1A, 1A... Are led to the final laminating roll 40, and the laminating speed of the laminating roll 40 is changed to that of the first nip roll 10, 10. You may enable it to expand | extend to the target expansion | extension magnification by making it faster than a circumferential speed. Reference numeral 50 denotes a second turning roll, and reference numeral 60 denotes a target bonding material.
[0022]
The turning roll 30 is in contact with the first nip roll 10. The second turning roll 50 may be in contact with the bonding roll 40 or may be separated. Instead of the turning roll 50, an appropriate direction changing means can be used.
[0023]
【The invention's effect】
As described above, according to the present invention, it is not necessary to thread the separation guide, the occurrence of thread breakage is suppressed, the tension is uniform in the final product, and the powder does not scatter over a wide area. The benefits of
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a line configuration of the present invention.
FIG. 2 is a perspective view showing a form of a dividing line.
FIG. 3 is a schematic diagram showing a line configuration of another example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Parent elastic elastic member, 1A ... Unit elastic elastic member, 10 ... 1st nip roll , 20 ... 2nd nip roll , 30 ... Turning roll .

Claims

When the flat elastic elastic member is separated into a plurality of unit elastic members in the width direction and attached to the product material,
A pair of first nip rolls arranged so that the roll surfaces are in contact with each other and a pair of second nip rolls arranged so that the roll surfaces are in contact with each other are spaced apart in the line flow direction. , Each of the first nip rolls in contact with each roll, a turning roll is provided,
Supplying the elastic elastic member in a substantially non-extended state between the first nip rolls, while maintaining the non-extended state of the elastic elastic member before being supplied between the first nip rolls,
On the exit side between the first nip rolls , one unit elastic elastic member alternates with respect to the turning rolls facing each other after going around one roll peripheral surface of the first nip roll alternately in the width direction of the elastic elastic member. , The other unit elastic elastic member goes around the turning rolls facing each other after going around the other roll peripheral surface of the first nip roll,
Pull each unit elastic stretchable member group from the downstream side of the nip position of the first nip roll, and use the nip position of the first nip roll as a separation start position to split each unit elastic stretchable member,
The individual elastic elastic members for which the segmentation has been completed are passed between the second nip rolls downstream, the peripheral speed of the second nip roll is made faster than the peripheral speed of the first nip roll, and the second nip roll extends from the first nip roll to the second A method for separating elastic elastic members, wherein each unit elastic elastic member is stretched to a desired magnification between the nip rolls.

In a device that separates a flat elastic elastic member into a plurality of unit elastic members in the width direction and attaches them to a product material,
A pair of first nip rolls arranged so that the roll surfaces are in contact with each other and a pair of second nip rolls arranged so that the roll surfaces are in contact with each other are spaced apart in the line flow direction. ,
A turning roll is provided in contact with each roll of the first nip roll ,
Without providing guide means between these turning rolls and the second nip roll, it is a free section,
Supplying the elastic elastic member in a substantially non-extended state between the first nip rolls, while maintaining the non-extended state of the elastic elastic member before being supplied between the first nip rolls,
On the exit side between the first nip rolls , one unit elastic elastic member alternates with respect to the turning rolls facing each other after going around one roll peripheral surface of the first nip roll alternately in the width direction of the elastic elastic member. , The other unit elastic elastic member goes around the turning rolls facing each other after going around the other roll peripheral surface of the first nip roll,
Each unit elastic elastic member group is pulled from the downstream side of the nip position of the first nip roll, and the second nip roll is separated from each unit elastic elastic member with the nip position of the first nip roll as a separation start position. Configured to lead in between
The peripheral speed of the second nip roll is increased from the peripheral speed of the first nip roll, and each unit elastic elastic member is extended to a desired magnification between the first nip roll and the second nip roll. A branching device for elastic elastic members.