JP4585530B2 - Tissue paper - Google Patents

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JP4585530B2
JP4585530B2 JP2007024885A JP2007024885A JP4585530B2 JP 4585530 B2 JP4585530 B2 JP 4585530B2 JP 2007024885 A JP2007024885 A JP 2007024885A JP 2007024885 A JP2007024885 A JP 2007024885A JP 4585530 B2 JP4585530 B2 JP 4585530B2
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fiber
heat
fibers
sealing
layer
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JP2008190073A (en
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真一 藁科
綾子 廣野
浩 大野
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Daio Paper Corp
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Description

本発明は薄葉紙に関し、特に、産業製品、工業製品やその部品、試験・実験器具等の清拭に用いるワイプとして好適な薄葉紙に関する。   The present invention relates to a thin paper, and more particularly to a thin paper suitable as a wipe used for wiping industrial products, industrial products and parts thereof, test / laboratory instruments, and the like.

産業製品、工業製品やその部品、試験・実験器具等の清拭用に用いるワイプは、清拭に耐えうる引張り強度があり、リント(紙粉)及びケバ立ちの発生が極めて少ないことが要求される。
特開昭50−14872号公報
Wipes used for wiping industrial products, industrial products and their parts, test / laboratory equipment, etc. are required to have a tensile strength that can withstand wiping, and to generate very little lint (paper dust) and scratches. The
Japanese Patent Laid-Open No. 50-14872

従来、この種のワイプには、短繊維の化学繊維とパルプとを湿式抄紙した化繊混抄紙が一般的に用いられている。
しかし、化繊混抄紙は、繊維間の空隙を増加させるとリントが発生し易くなり、パルプ繊維の割合を増加させると、湿潤強度が低下するため、嵩高さ、柔らかさ、吸液性の点で不十分なものが多い。
そこで、本発明の主たる課題は、清拭の際のケバ立ちやリントが発生し難いことはもちろん、さらに嵩高で柔らかく吸液性があり、清拭性に優れる薄葉紙を提供することにある。
Conventionally, a synthetic fiber mixed paper obtained by wet papermaking of a short fiber chemical fiber and pulp is generally used for this type of wipe.
However, synthetic fiber papers tend to generate lint when the gaps between the fibers are increased, and the wet strength decreases when the proportion of pulp fibers is increased. Therefore, in terms of bulkiness, softness, and liquid absorption. Many are inadequate.
Thus, the main problem of the present invention is to provide a thin paper that is not only easily rubbed and linted but also bulky, soft and liquid-absorbing, and has excellent wiping properties.

上記課題を解決した本発明およびその作用効果は次記のとおりである。
<請求項1記載の発明>
各層が化学繊維とパルプとを混抄した化繊混抄紙からなる3層からなり、合計米坪が40〜180g/m 2 の乾式の清拭ワイプ用薄葉紙であって、
JIS P 8113に規定される裂断長が1.0〜8.0kmであり、熱融着繊維を含み、かつ80〜140℃の範囲で熱融着機能を発揮する表裏面各層と、
クリンプ繊維を含む比容積が3〜30cm3/gの中間層とを有し、
隣接する各層相互がヒートシールエンボス加工または超音波シールにより散点状に接合されて一体化されている、ことを特徴とする薄葉紙。
The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
Each layer is composed of three layers made of a synthetic fiber mixed paper in which chemical fibers and pulp are mixed, and is a dry wipe thin paper with a total weight of 40 to 180 g / m 2 ,
Front and back layers each having a tear length specified in JIS P 8113 of 1.0 to 8.0 km , including heat-sealing fibers, and exhibiting a heat-sealing function in the range of 80 to 140 ° C . ;
An intermediate layer having a specific volume of 3 to 30 cm 3 / g including crimp fibers ;
A thin paper characterized in that adjacent layers are joined and integrated in the form of dots by heat seal embossing or ultrasonic sealing .

(作用効果)
本発明の薄葉紙は、表裏面の各層の裂断長を1.0〜8.0kmとすることで、清拭時に十分な強度であり、かつリントの発生の少ないものとなる。
そして、これらの間に介在される中間層の比容積を3〜30cm3/gとすることで、嵩高く、吸液性が向上するとともに、柔らかさが付与される。
そして、これら各層相互を散点状に接合して一体化した。その結果、清拭の際のケバ立ちやリントが発生し難く、さらに嵩高で柔らかさがあり、清拭性に極めて優れるものとなる。
乾燥強度、湿潤強度が高くなり、リントの発生が少なくなる。
一般的な抄紙工程におけるドライヤーパートは一般的には80〜140℃の範囲の所定温度又は所定温度範囲で行われる。従って、本発明の構成の薄葉紙は、前記所定温度等で融着機能を発揮する熱融着繊維を乾燥抄紙原料中に含有せしめておくことで、抄紙工程の乾燥時に熱融着繊維の適当量を溶融又は軟化させて繊維同士を接着させて製造できる。
すなわち、本発明の薄葉紙は、一般的な抄紙工程により簡易に製造でき、特殊な熱融着繊維の溶融等のための工程を新たに行う必要がない。
また、例えば、当該所定温度又は所定温度範囲の上限温度以上で溶融又は軟化する、他の機能を有する熱融着繊維を適宜配合することができるため、機能の相違する複数種の熱融着繊維を含有しつつ、熱融着による効果的な強度、リント発生防止効果を得ることが可能となる。
さらに、抄紙後にヒートシールエンボスや超音波シールなどで各層を熱融着することも容易になる。
ヒートシールにより散点状に接着すると、嵩高性(吸水及び吸油性を高める)を確保しながら効果的に各層が接合される。
層相互の一体化にあたり、接着剤を使用することも可能であるが、リント発生を抑える為には表面にも接着剤を塗工する必要が生ずる。この場合柔らかさが低下するので望ましいものではない。
エアレイド法や機械的な交絡法(スパンレース法)によって接合することも可能であるが、剛性が過度に高まるおそれがあり、接合強度も十分とならない場合がある。
これらに対し、熱溶着性を利用するヒートシールによって散点状に各層を接合すれば、リント発生のおそれが格段に小さく、しかも高い接合強度でありながら剛性が過度に高くないものとなる。
(Function and effect)
The thin paper of the present invention has sufficient strength at the time of wiping and less lint generation by setting the tear length of each layer on the front and back surfaces to 1.0 to 8.0 km.
And by making the specific volume of the intermediate | middle layer interposed between these into 3-30 cm < 3 > / g, while being bulky and improving a liquid absorptivity, softness is provided.
Then, these layers were joined together in the form of dots. As a result, the occurrence of littering and lint at the time of wiping hardly occurs, and it is bulky and soft, and the wiping property is extremely excellent.
Dry strength and wet strength are increased and lint generation is reduced.
The dryer part in a general papermaking process is generally performed at a predetermined temperature in the range of 80 to 140 ° C. or a predetermined temperature range. Accordingly, the thin paper having the structure of the present invention contains the heat-fusible fiber exhibiting the fusing function at the predetermined temperature or the like in the dry papermaking raw material, so that an appropriate amount of the heat-fusible fiber at the time of drying in the papermaking process. Can be produced by melting or softening the fiber and bonding the fibers together.
That is, the thin paper of the present invention can be easily manufactured by a general papermaking process, and it is not necessary to newly perform a process for melting a special heat-sealing fiber.
In addition, for example, heat-bonding fibers having other functions that melt or soften at the predetermined temperature or the upper limit temperature of the predetermined temperature range can be appropriately blended. It is possible to obtain an effective strength by heat fusion and an effect of preventing the occurrence of lint.
Furthermore, it becomes easy to heat-seal each layer by heat seal embossing or ultrasonic sealing after paper making.
Adhering in the form of dots by heat sealing effectively bonds the layers while ensuring bulkiness (enhancing water absorption and oil absorption).
In order to integrate the layers, it is possible to use an adhesive, but in order to suppress the occurrence of lint, it is necessary to apply the adhesive to the surface. In this case, the softness decreases, which is not desirable.
Although it is possible to join by the airlaid method or the mechanical entanglement method (spun lace method), there is a possibility that the rigidity may be excessively increased and the joining strength may not be sufficient.
On the other hand, if each layer is joined in the form of dots by heat sealing using heat-weldability, the risk of lint generation is remarkably reduced, and the rigidity is not excessively high although the joint strength is high.

本発明によれば、清拭に耐えうる引張り強度があり、しかも清拭の際のケバ立ちやリントが発生し難く、さらに嵩高で柔らかさのある薄葉紙が提供される。   According to the present invention, there is provided a thin paper that has a tensile strength that can withstand wiping, is less prone to flaking and lint, and is bulky and soft.

以下本発明の実施の形態によってさらに説明する。
本発明は、図1に示すように、表裏面各層10,20と、これらの間に介在される中間層30とを有し、隣接する各層相互が接合されて一体化されている。
各層は、既知の抄紙技術により抄紙して形成することができる。すなわち、後述する層を構成するパルプ、化学繊維及び添加物等を含む抄紙原料を湿紙の状態とした後に、ドライヤーにより乾燥して形成することができる。
必要に応じて、カレンダー処理などの平滑化処理を施してもよい。
The present invention will be further described below with reference to embodiments.
As shown in FIG. 1, the present invention has front and back layers 10 and 20 and an intermediate layer 30 interposed therebetween, and adjacent layers are joined and integrated.
Each layer can be formed by paper making using a known paper making technique. That is, it can be formed by drying a papermaking raw material containing pulp, chemical fibers, additives, and the like constituting a layer, which will be described later, with a drier, and then drying with a dryer.
You may perform smoothing processes, such as a calendar process, as needed.

表裏面各層は、JIS P 8113に規定される裂断長1.0〜8.0kmの化繊混抄紙で構成される。裂断長が1.0km未満であると、清拭時における繊維の毛羽立ちを十分に防止できず、リントが発生し易く、破れやすくなる。8.0kmを越える場合には、嵩高とすることが困難となるうえ、柔らかさが失われる。特に、短繊維を用いた湿式抄紙で嵩高にするのが極めて困難となる。   Each of the front and back layers is composed of a synthetic fiber mixed paper having a breaking length of 1.0 to 8.0 km as defined in JIS P8113. When the breaking length is less than 1.0 km, the fiber fluffing at the time of wiping cannot be sufficiently prevented, lint is easily generated, and the fiber is easily broken. When it exceeds 8.0 km, it becomes difficult to make it bulky and softness is lost. In particular, it is very difficult to make the paper bulky by wet papermaking using short fibers.

表面層10及び裏面層20は、好適に熱融着繊維を含み、この熱融着繊維により構成繊維同士が接着されている。
繊維同士の接着に用いられる熱融着繊維の配合割合は2〜30質量%であるのが望ましい。より好適には5〜15質量%の範囲である。2質量%未満であると熱融着繊維配合によるリント発生の防止効果が十分に発揮されない。30質量%を超えると柔らかさを発現させ難くなる。
表面層及び裏面層において、繊維同士の接着に用いられている熱融着繊維は、好適には80〜140℃の範囲中の所定温度又は所定温度範囲で熱融着機能を発揮するものである。ここで熱融着とは、溶融又は軟化による接着機能のことである。
従って、表面層及び裏面層における、熱融着繊維配合の点で望ましい構成は、80〜140℃の範囲中の所定温度又は所定温度範囲で熱融着機能を発揮する熱融着繊維が2〜30質量%含まれる構成である。
The front surface layer 10 and the back surface layer 20 preferably include heat-sealing fibers, and the constituent fibers are bonded to each other by the heat-sealing fibers.
The blending ratio of the heat-fusible fiber used for bonding the fibers is desirably 2 to 30% by mass. More preferably, it is the range of 5-15 mass%. If it is less than 2% by mass, the effect of preventing the occurrence of lint by the heat-bonding fiber blending is not sufficiently exhibited. When it exceeds 30 mass%, it becomes difficult to express softness.
In the surface layer and the back surface layer, the heat-sealing fiber used for bonding the fibers preferably exhibits a heat-sealing function at a predetermined temperature in a range of 80 to 140 ° C. or a predetermined temperature range. . Here, heat fusion refers to an adhesion function by melting or softening.
Therefore, in the surface layer and the back surface layer, the desirable composition in terms of blending the heat-fusible fibers is that the heat-sealing fibers exhibiting the heat-sealing function at a predetermined temperature in the range of 80 to 140 ° C. or a predetermined temperature range are 2 30% by mass is included.

抄紙工程におけるドライヤーパートでは一般的に80〜140℃の温度範囲の中から適宜の温度が選択される。従って、その温度範囲中の所定温度等で溶融等する熱融着繊維を、乾燥抄紙原料中に上記範囲混合しておけば、抄紙工程の特にドライヤーパートで溶融等して繊維間同士が接着され、リント発生防止効果が好適に発現される。
ドライヤーによる乾燥処理など抄紙工程の一連の工程のなかで極めて容易に、適当量の熱融着繊維をバインダーとして機能させることが可能である。
また、後述する各層の接合に当たってヒートシールを採用する場合にも、上記配合割合及び温度範囲とすると、各層接合に寄与するバインダーとしての機能も効果的に発揮される。これら製造上の利点の観点からは、上記範囲よりも熱融着温度が過度に低いと抄紙工程等において過度の溶融等により硬くなり、高すぎるとバインダー効果を発揮せず強度の低いものとなる。
In the dryer part in the paper making process, an appropriate temperature is generally selected from the temperature range of 80 to 140 ° C. Therefore, if the heat-sealing fibers that are melted at a predetermined temperature in the temperature range are mixed in the above range in the dry papermaking raw material, the fibers are bonded to each other by melting in the papermaking process, particularly in the dryer part. In addition, the lint generation preventing effect is suitably expressed.
In a series of papermaking processes such as drying with a dryer, an appropriate amount of heat-sealing fiber can be made to function as a binder.
Moreover, also when employ | adopting a heat seal in joining of each layer mentioned later, when it is set as the said mixture ratio and temperature range, the function as a binder which contributes to each layer joining is exhibited effectively. From the viewpoint of these production advantages, if the heat fusion temperature is excessively lower than the above range, it becomes hard due to excessive melting in the paper making process, etc., and if it is too high, the binder effect is not exhibited and the strength is low. .

熱融着繊維は、鞘部に芯部より融点の低い樹脂を用いた芯鞘構造の複合バインダー繊維、例えば、芯/鞘=PP(ポリプロピレン)/PP(ポリプロピレン)、PP(ポリプロピレン)/PE(ポリエチレン)、PET(ポリエチレンテレフタレート)/低融点PET等の複合繊維や、低融点PET繊維、PP繊維などが挙げられる。特にPETの複合繊維が好適である。もちろん、芯鞘構造でない単一成分の熱融着繊維であってもよい。
また、熱融着繊維は、柔らかさ及び強度維持の点から、繊維度1.0〜5.0dtex、繊維長2〜7mmであるのが望ましい。
The heat-sealable fiber is a composite binder fiber having a core-sheath structure in which a resin having a melting point lower than that of the core is used for the sheath, for example, core / sheath = PP (polypropylene) / PP (polypropylene), PP (polypropylene) / PE ( Polyethylene), composite fibers such as PET (polyethylene terephthalate) / low melting point PET, low melting point PET fibers, PP fibers, and the like. In particular, a composite fiber of PET is suitable. Of course, it may be a single-component heat-sealing fiber that does not have a core-sheath structure.
In addition, it is desirable that the heat-fusible fiber has a fiber degree of 1.0 to 5.0 dtex and a fiber length of 2 to 7 mm from the viewpoint of softness and strength maintenance.

表面層10及び裏面層20は、上述の熱融着繊維以外の化学繊維(以下、主体繊維ともいう)を好適に含む。主体繊維は15〜50質量%あるのがよい。主体繊維は、繊維長2〜6mm、繊維度0.1〜3dtexであるのがよい。繊維度が小さすぎると抄紙時に絡まりやすく地合が悪化し、繊維度が大きすぎると滑らかさに劣る紙となる。
ここで、主体繊維は、実質的に熱融着性を有さないものが好適であるが、熱融着性を有するものであってもよい。実質的に繊維間の接着に用いられていない繊維は、本発明では主体繊維である。主体繊維として熱融着性のある繊維を含む場合、上述の熱融着繊維よりも、融着機能を発揮する温度が15℃以上高いものであればよい。
従って、先に示した80〜140℃の範囲中の所定温度等で熱融着機能を発揮する熱融着繊維を2〜15質量%含む形態の表裏面各層では、当該所定温度等で熱融着機能を発揮しない化学繊維は、熱融着性の化学繊維であっても本発明では主体繊維である。
The front surface layer 10 and the back surface layer 20 suitably include chemical fibers (hereinafter also referred to as main fibers) other than the above-mentioned heat-fusible fibers. The main fiber is preferably 15 to 50% by mass. The main fiber may have a fiber length of 2 to 6 mm and a fiber degree of 0.1 to 3 dtex. If the fiber degree is too small, the paper is easily entangled during paper making, and the texture is deteriorated. If the fiber degree is too large, the paper becomes inferior in smoothness.
Here, the main fiber is preferably one having substantially no heat-fusibility, but may be one having heat-fusibility. In the present invention, fibers that are not substantially used for bonding between fibers are main fibers. In the case where the main fiber includes a heat-fusible fiber, the fiber that exhibits a fusing function may be higher than the above-mentioned heat-fusible fiber by 15 ° C. or more.
Therefore, in each of the front and back layers in the form containing 2 to 15% by mass of the heat-fusible fiber that exhibits the heat-sealing function at the predetermined temperature in the range of 80 to 140 ° C. described above, In the present invention, the chemical fiber that does not exhibit the adhesion function is a main fiber in the present invention even if it is a heat-fusible chemical fiber.

他方、表面層10及び裏面層20の化学繊維以外の残部は、パルプで構成されているが好ましい。具体的には、パルプとしては、グランドウッドパルプ(GP)・プレッシャーライズドグランドウッドパルプ(PGW)・サーモメカニカルパルプ(TMP)等の機械パルプ、セミケミカルパルプ(CP)、針葉樹高歩留り未晒クラフトパルプ(HNKP)・針葉樹晒クラフトパルプ(NBKP)・広葉樹未晒クラフトパルプ(LUKP)・広葉樹晒クラフトパルプ(LBKP)等の化学パルプ、及びデインキングパルプ(DIP)・ウェイストパルプ(WP)等の古紙パルプが例示できる。
上記パルプは、一種または二種以上を選択して用いることができる。
なかでも填料や異物を含まない化学パルプが好適である。より好ましくはNBKPが良い。一般的にLBKPよりもNBKPのほうが、繊維長が長く繊維太さが太いため、NBKPが多いほうが、強度が高く、嵩高となるとともに、表裏面に付着した吸水性や吸油性が良好となり、水分・油分の保持性も良好となる。好適には、層中にNBKPが30〜70質量%含まれるのがよい。
ここで、表面層10と裏面層20とは、必ずしも同様に構成する必要はなく、上記説明の範囲内で適宜異なる構成とすることができる。ただし、熱融着繊維による各層の接着が好適に行えるようになることから、熱融着繊維に関しては、同種又は熱融着温度が同程度のものを用いるのがよい。
On the other hand, the remainder other than the chemical fibers of the front surface layer 10 and the back surface layer 20 is preferably made of pulp. Specifically, the pulp includes mechanical pulp such as groundwood pulp (GP), pressure-rise groundwood pulp (PGW), and thermomechanical pulp (TMP), semi-chemical pulp (CP), and high yield unexposed kraft. Chemical pulp such as pulp (HNKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP), and used paper such as deinking pulp (DIP) and waste pulp (WP) Pulp can be exemplified.
The said pulp can select and use 1 type, or 2 or more types.
Among these, chemical pulp containing no filler or foreign matter is preferable. NBKP is more preferable. In general, NBKP has a longer fiber length and a larger fiber thickness than LBKP. Therefore, the more NBKP, the higher the strength and bulkiness, and the better the water absorption and oil absorption properties attached to the front and back surfaces. -Good oil retention. Preferably, NBKP is contained in the layer in an amount of 30 to 70% by mass.
Here, the front surface layer 10 and the back surface layer 20 do not necessarily have to be configured in the same manner, and can be appropriately configured within the scope of the above description. However, since it becomes possible to favorably bond the layers with the heat-sealing fibers, it is preferable to use the same or similar heat-sealing temperatures for the heat-sealing fibers.

他方、表裏面各層は、クレープ加工されていてもよい。クレープ加工によりより柔らかさと嵩高性が付与される。
さらに、表裏面各層には、湿潤紙力剤や、粘剤、分散剤、接着剤、剥離剤等の抄紙用薬品を適宜用いてもよい。
On the other hand, the front and back layers may be creped. Softness and bulkiness are imparted by creping.
Furthermore, a paper-making chemical such as a wet paper strength agent, a sticking agent, a dispersing agent, an adhesive, or a release agent may be appropriately used for the front and back layers.

他方、中間層30は、3〜30cm3/gの比容積を有する紙層、不織布層、化繊混抄紙層である。より好適な比容積は6〜20cm3/gである。中間層30の比容積が3cm3/g未満であると、嵩高さと柔らかさが発現しなくなり、30cm3/gを超えると実用的な強度が不足する。
特に、中間層は30クリンプ繊維が配合された化繊混抄紙であるのがよい。嵩高性、柔らかさの点で優れたものとなる。抄紙原料中に配合しておけば上記比容積に容易にすることができる。
On the other hand, the intermediate layer 30 is a paper layer, a nonwoven fabric layer, or a synthetic fiber mixed papermaking layer having a specific volume of 3 to 30 cm 3 / g. A more preferable specific volume is 6 to 20 cm 3 / g. When the specific volume of the intermediate layer 30 is less than 3 cm 3 / g, bulkiness and softness are not expressed, and when it exceeds 30 cm 3 / g, practical strength is insufficient.
In particular, the intermediate layer is preferably a synthetic fiber mixed paper blended with 30 crimp fibers. It is excellent in terms of bulkiness and softness. If it is blended in the papermaking raw material, the specific volume can be facilitated.

クリンプ繊維としては、例えば、ポリエステル繊維、ポリプロピレン繊維、ポリエチレン繊維、ポリエチレンテレフタレート繊維の長繊維に対して、正逆反対の撚りの繰り返しと熱処理とを繰り返して行うクリンプ加工(仮撚り加工、ウーリー加工とも言われる)を施して形成されるものが適する。
中でもポリエチレンテレフタレート繊維をクリンプ加工して形成されるPETクリンプ繊維が好適である。なお、化学繊維をクリンプ加工して形成される繊維のほか羊毛等の天然のクリンプ繊維をも用い得る。
Examples of the crimp fiber include, for example, a crimping process (both false twisting process and wooly process), which is performed by repeatedly repeating reverse and reverse twists and heat treatment for long fibers of polyester fiber, polypropylene fiber, polyethylene fiber, and polyethylene terephthalate fiber. It is suitable to be formed.
Among these, a PET crimp fiber formed by crimping polyethylene terephthalate fiber is preferable. In addition to the fibers formed by crimping chemical fibers, natural crimp fibers such as wool can also be used.

中間層30においても、熱融着繊維が配合されているのがよい。熱融着繊維は、表裏面各層に含まれるものとして挙げたものと同様のものでよい。すなわち、鞘部に芯部より融点の低い樹脂を用いた芯鞘構造の複合バインダー繊維、例えば、芯/鞘=PET/低融点PET、PP/PP、PP/PE等の複合繊維や、複合繊維でない単一成分の低融点PET繊維、低融点PP繊維などが挙げられ、特にPETの複合繊維が好適である。また、熱融着繊維は、一種のみならず複数種用いることができる。
中間層に用いる熱融着繊維は、特に繊維太さ1.0〜5.0dtex、繊維長2〜6mmのものが適する。なお、必ずしも表裏面層と同種のものが配合されている必要はない。
中間層30における熱融着繊維の割合は、表面層10及び裏面層20よりも少なく、15質量%未満であるのが望ましい。好適には10質量%未満を上限とするのが望ましい。15質量%を超えると、硬くなるおそれが極めて高くなる。
さらに、中間層30についてもクリンプ繊維及びバインダーとして機能する熱融着繊維以外の化学繊維が含まれていてもよい。
Also in the intermediate layer 30, it is preferable that heat-sealing fibers are blended. The heat-sealing fibers may be the same as those listed as included in the front and back layers. That is, a composite binder fiber having a core / sheath structure using a resin having a melting point lower than that of the core for the sheath, for example, composite fiber such as core / sheath = PET / low melting point PET, PP / PP, PP / PE, and composite fiber Non-single component low-melting point PET fibers, low-melting point PP fibers, and the like, and PET composite fibers are particularly suitable. Moreover, not only one type but two or more types of heat-sealing fibers can be used.
As the heat-sealing fiber used for the intermediate layer, those having a fiber thickness of 1.0 to 5.0 dtex and a fiber length of 2 to 6 mm are particularly suitable. In addition, the same kind as the front and back layers is not necessarily blended.
The proportion of the heat-sealing fibers in the intermediate layer 30 is less than that of the front surface layer 10 and the back surface layer 20, and is preferably less than 15% by mass. The upper limit is preferably less than 10% by mass. If it exceeds 15% by mass, the risk of becoming hard becomes extremely high.
Further, the intermediate layer 30 may also contain chemical fibers other than the heat-sealing fibers that function as crimp fibers and binders.

他方、中間層30の化学繊維以外の残部も、表裏面各層10,20と同様に、パルプで構成されているのがよい。パルプとしては、グランドウッドパルプ(GP)・プレッシャーライズドグランドウッドパルプ(PGW)・サーモメカニカルパルプ(TMP)等の機械パルプ、セミケミカルパルプ(CP)、針葉樹高歩留り未晒クラフトパルプ(HNKP)・針葉樹晒クラフトパルプ(NBKP)・広葉樹未晒クラフトパルプ(LUKP)・広葉樹晒クラフトパルプ(LBKP)等の化学パルプ、ならびにデインキングパルプ(DIP)・ウェイストパルプ(WP)等の古紙パルプのうち、一種または二種以上を選択して用いることができる。
特に、填料や異物を含まない化学パルプが好ましく、さらに好ましくはNBKPが適する。一般的にLBKPよりもNBKPのほうが、繊維太さが太いため、NBKPが多いほうが嵩高となるとともに、吸液性及び液保持性が良好となる。好適には、層中にNBKPが30〜70質量%含まれるのがよい。
また、中間層はクレープ加工されているのがよい。柔らかくなり嵩が高まる。
さらに、湿潤紙力剤や、粘剤、分散剤、接着剤、剥離剤等の抄紙用薬品を適宜用いてもよい。
On the other hand, the remainder other than the chemical fibers of the intermediate layer 30 is preferably made of pulp, like the front and back layers 10 and 20. Pulp includes mechanical pulps such as groundwood pulp (GP), pressure-rise groundwood pulp (PGW), thermomechanical pulp (TMP), semi-chemical pulp (CP), high yield unexposed kraft pulp (HNKP), One type of chemical pulp such as softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP), and used paper pulp such as deinking pulp (DIP) and waste pulp (WP) Or it can select and use 2 or more types.
In particular, a chemical pulp containing no filler or foreign matter is preferable, and NBKP is more preferable. In general, NBKP has a larger fiber thickness than LBKP, so that a larger amount of NBKP becomes bulky, and liquid absorbency and liquid retention are better. Preferably, NBKP is contained in the layer in an amount of 30 to 70% by mass.
The intermediate layer is preferably creped. Softens and increases bulk.
Furthermore, papermaking chemicals such as a wet paper strength agent, a viscosity agent, a dispersant, an adhesive, and a release agent may be used as appropriate.

表面層10、裏面層20及び中間層30の合計米坪は、40〜180g/m2が好ましく、より好ましくは70〜150g/m2である。40g/m2未満であると、嵩高となり難く、吸液性も発現し難くなる。180g/m2を越えると柔らかさを発現させ難くなる。
また、合計米坪に対する各層の米坪の割合は、表面層:中間層:裏面層=10〜30:30〜50:10〜30とするのがよい。各々この範囲であれば、薄葉紙全体として、清拭に耐えうる強度を有しつつ、嵩高で柔らかさのあるものが得られる。
40-180 g / m < 2 > is preferable, and, as for the total rice floor of the surface layer 10, the back surface layer 20, and the intermediate | middle layer 30, More preferably, it is 70-150 g / m < 2 >. If it is less than 40 g / m 2 , it will be difficult to be bulky and it will also be difficult to develop liquid absorbency. If it exceeds 180 g / m 2 , it becomes difficult to express softness.
Moreover, it is good for the ratio of the rice tsubo of each layer with respect to the total tsubo to be surface layer: intermediate layer: back surface layer = 10-30: 30-50: 10-30. If it is each within this range, the thin paper sheet as a whole can be bulky and soft while having strength that can withstand wiping.

他方、各層10〜30の接合一体化は、ヒートシール又は超音波シールにより前記熱融着繊維の熱融着機能を発揮させつつ行われているのが望ましいが、熱融着繊維を溶かす薬液散布や接着剤によって接合一体化されていてもよい。
ヒートシールの態様としては、スチール−ラバー方式やスチール−スチール方式といった公知の技術及び装置を使用することができる。スチール−ラバー方式の場合、ラバー側をテフロン含有の材質とすることで、ラバー自体の熱による溶融を防止すると共に、薄葉紙の各層を接合する際に、所望部分だけにシール(熱融着による封印)することができる。
On the other hand, it is desirable that the bonding and integration of the respective layers 10 to 30 is performed while exhibiting the heat-sealing function of the heat-sealing fibers by heat sealing or ultrasonic sealing, but the chemical solution spraying to dissolve the heat-sealing fibers. Or may be joined and integrated by an adhesive.
As a heat sealing mode, a known technique and apparatus such as a steel-rubber method or a steel-steel method can be used. In the case of the steel-rubber system, the rubber side is made of a Teflon-containing material to prevent the rubber itself from being melted by heat, and at the time of joining the layers of thin paper, only the desired part is sealed (sealed by heat sealing) )can do.

ヒートシールであれば、散点状に押圧するヒートシールエンボス加工により、部分的にシールされているのが特に望ましい。一つのエンボス凹部Eの形状としては、長方形や正方形、菱形といった多角形、星や花、葉といった図形等とすることができるが、望ましくは直径1〜2mm円形であるのがよい。
エンボスが行なわれている領域は、薄葉紙の一方の面の面積当たり10〜30%であるのがよく、10%未満であると、薄葉紙の各層の接合が不十分になり剥がれ易くなる恐れがある。他方、30%を越えると、薄葉紙自体の嵩が減り、手に持った時に硬い感触となると共に、清拭性、吸水性・吸油性が十分に発揮できない。
In the case of heat sealing, it is particularly desirable to be partially sealed by heat seal embossing that presses in a dotted pattern. The shape of one embossed recess E can be a polygon such as a rectangle, a square, or a rhombus, or a figure such as a star, a flower, or a leaf, but preferably has a diameter of 1 to 2 mm.
The area where embossing is performed should be 10 to 30% per area of one side of the thin paper, and if it is less than 10%, the layers of the thin paper may be insufficiently bonded and easily peeled off. . On the other hand, if it exceeds 30%, the thickness of the thin paper itself is reduced, and it feels hard when it is held in the hand, and the wiping property, water absorption and oil absorption properties cannot be fully exhibited.

超音波シールであれば、散点状の接着部を形成するようにして行うのが特に望ましい。
なお、本発明における散点状とは、多数のドットのほか、多数の格子状、スパイラル状等による部分的な接合態様も含む。
In the case of an ultrasonic seal, it is particularly desirable to perform so as to form a dotted adhesive portion.
The scattered dot shape in the present invention includes not only a large number of dots but also a partial joining mode such as a large number of lattice shapes and spiral shapes.

『評価試験』
本発明の実施例及び比較例について、表面強度、柔らかさ、吸水量、吸水速度について試験を行った。試験結果は、下記表1に示す。
実施例及び比較例の物性等、試験の方法及び評価基準は次記のとおりである。
"Evaluation test"
About the Example and comparative example of this invention, it tested about surface strength, softness, the amount of water absorption, and the water absorption speed. The test results are shown in Table 1 below.
Test methods and evaluation criteria such as physical properties of Examples and Comparative Examples are as follows.

<実施例1>
実施例1は、裂断長が縦1.80km、横1.37kmの表裏面各層と、比容積が7.3cm3/gの中間層とで構成し、各層の接合は、散点状に押圧するヒートシールエンボス加工により行った。
表裏面各層は、0.1dtexアクリル繊維(D122、0.1dtex、6mm、三菱レイヨン製)40質量%、芯鞘PET/PET繊維(熱融着温度130℃、N720H、2.2dtex、5mm、クラレ製)10質量%、NBKP50質量%で構成した。
中間層は、PETクリンプ繊維(TT04、2.2dtex、5mm、テイジンファイバー製)40質量%、芯鞘PET/PET繊維(熱融着温度130℃ N720H クラレ製)10質量%、NBKP50質量%で構成した。
<実施例2>
実施例2は、裂断長が縦1.86km、横1.61kmの表裏面各層と、比容積が7.3cm3/gの中間層とで構成し、各層の接合は、散点状に押圧するヒートシールエンボス加工により行った。
表裏面各層は、芯鞘PET/PET繊維(熱融着温度130℃、N720H、2.2dtex、5mm、クラレ製)40質量%、芯鞘PET/PET繊維(熱融着温度110℃、4080、1.1dtex、5mm、ユニチカファイバー製)10質量%、NBKP50質量%で構成し、抄紙工程の乾燥処理においてドライヤー温度を115℃とし、前記熱融着温度110℃の芯鞘PET/PET繊維を融着させてバインダー効果を発揮させた。
<実施例3>
実施例3は、表裏面層及び中間層の構成は実施例1と同様とし、各層の接合方法は散点状に押圧する超音波シールに変更して製造した。
<実施例4>
実施例4は、表裏面層及び中間層の構成は実施例2と同様とし、各層の接合方法は散点状に押圧する超音波シールに変更して製造した。
<実施例5>
実施例5は、裂断長が縦4.58km、横2.45kmの表裏面各層と、比容積が18.2cm3/gの中間層とで構成し、各層の接合は、散点状に押圧するヒートシールエンボス加工により行った。
表裏面各層は、0.1dtexPET繊維(0.1dtex、5mm、テイジンファイバー製)40質量%、芯鞘PET/PET繊維(熱融着温度130℃、N720H、2.2dtex、5mm、クラレ製)15質量%、芯鞘PET/PET繊維(熱融着温度110℃、4080、1.1dtex、5mm、ユニチカファイバー製)5質量%、NBKP40質量%で構成した。
中間層は、PETクリンプ繊維(TT04、2.2dtex、5mm、テイジンファイバー製)40質量%、芯鞘PET/PET繊維(熱融着温度130℃ N720H クラレ製)5質量%、NBKP55質量%で構成した。
<Example 1>
Example 1 is composed of front and back layers each having a fracture length of 1.80 km in length and 1.37 km in width, and an intermediate layer having a specific volume of 7.3 cm 3 / g. Performed by pressing heat seal embossing.
Each layer on the front and back surfaces is composed of 40% by mass of 0.1 dtex acrylic fiber (D122, 0.1 dtex, 6 mm, manufactured by Mitsubishi Rayon), core / sheath PET / PET fiber (heat fusion temperature 130 ° C., N720H, 2.2 dtex, 5 mm, Kuraray) (Made) 10% by mass and NBKP 50% by mass.
The intermediate layer is composed of 40% by mass of PET crimp fiber (TT04, 2.2 dtex, 5 mm, manufactured by Teijin Fiber), 10% by mass of core / sheath PET / PET fiber (thermal fusion temperature 130 ° C., N720H Kuraray), and NBKP 50% by mass. did.
<Example 2>
Example 2 is composed of front and back layers each having a tear length of 1.86 km and a width of 1.61 km, and an intermediate layer having a specific volume of 7.3 cm 3 / g. Performed by pressing heat seal embossing.
Each layer on the front and back surfaces is composed of a core-sheath PET / PET fiber (heat fusion temperature 130 ° C., N720H, 2.2 dtex, 5 mm, manufactured by Kuraray) 40% by mass, a core-sheath PET / PET fiber (heat fusion temperature 110 ° C., 4080, 1.1 dtex, 5 mm, made by Unitika fiber) 10% by mass and NBKP 50% by mass. In the drying process of the papermaking process, the dryer temperature was 115 ° C., and the core-sheathed PET / PET fiber having the heat fusion temperature of 110 ° C. was melted. It was put on to demonstrate the binder effect.
<Example 3>
In Example 3, the structures of the front and back layers and the intermediate layer were the same as those in Example 1, and the joining method of each layer was changed to an ultrasonic seal that pressed like dots.
<Example 4>
In Example 4, the structures of the front and back layers and the intermediate layer were the same as in Example 2, and the joining method of each layer was changed to an ultrasonic seal that pressed like dots.
<Example 5>
Example 5 is composed of front and back layers each having a tear length of 4.58 km and a width of 2.45 km, and an intermediate layer having a specific volume of 18.2 cm 3 / g. Performed by pressing heat seal embossing.
Each of the front and back layers is composed of 40% by mass of 0.1 dtex PET fiber (0.1 dtex, 5 mm, made by Teijin Fiber), core-sheath PET / PET fiber (heat fusion temperature 130 ° C., N720H, 2.2 dtex, 5 mm, made by Kuraray) 15 It was composed of 5% by mass, core / sheath PET / PET fiber (thermal fusion temperature 110 ° C., 4080, 1.1 dtex, 5 mm, manufactured by Unitika Fiber), and NBKP 40% by mass.
The intermediate layer is composed of PET crimp fiber (TT04, 2.2 dtex, 5 mm, made by Teijin Fiber) 40% by mass, core-sheath PET / PET fiber (heat fusion temperature 130 ° C., N720H Kuraray) 5% by mass, NBKP 55% by mass. did.

<比較例1>
比較例1は、表裏面層は実施例5と同様とし、比容積2.9cm3/gの中間層とで構成し、各層の接合は、散点状に押圧するヒートシールエンボス加工により行った。
中間層は、芯鞘PET/PET繊維(熱融着温度110℃、4080、1.1dtex、5mm、ユニチカファイバー製)10質量%、NBKP90質量%で構成した。
<比較例2>
比較例1、実施例1の表面層と同様の構成の層を4層積層した構造とした。接合はヒートロールにて全面を接着して一体化することにより行った。
<比較例3>
比較例2は、裂断長が縦0.35km、横0.29kmの表面層と、比容積5.6cm3/gの化繊混抄紙からなる裏面層の2層構造とした。
表面層は、PP繊維(PZ、3.3dtex、5mm、ダイワボウポリテック製)40質量%、芯鞘PP/PE(熱融着温度130℃、インタック、1.7dtex、5mm、ESファイバービジョンズ製)10質量%、NBKP50%で構成した。
表裏面層の接合は、ヒートシールエンボスにより散点状に押圧して一体化して行った。
<Comparative Example 1>
In Comparative Example 1, the front and back layers were the same as those in Example 5, and constituted by an intermediate layer having a specific volume of 2.9 cm 3 / g, and the bonding of each layer was performed by heat seal embossing that pressed in the form of dots. .
The intermediate layer was composed of 10% by mass of core / sheath PET / PET fiber (heat fusion temperature 110 ° C., 4080, 1.1 dtex, 5 mm, manufactured by Unitika Fiber) and 90% by mass of NBKP.
<Comparative example 2>
It was set as the structure which laminated | stacked four layers of the structure similar to the surface layer of the comparative example 1 and Example 1. FIG. Bonding was performed by bonding and integrating the entire surface with a heat roll.
<Comparative Example 3>
Comparative Example 2 has a two-layer structure of a surface layer having a breaking length of 0.35 km in length and 0.29 km in width and a back layer made of synthetic fiber paper having a specific volume of 5.6 cm 3 / g.
The surface layer is made of PP fiber (PZ, 3.3 dtex, 5 mm, manufactured by Daiwabo Polytech) 40% by mass, core sheath PP / PE (heat fusion temperature 130 ° C., intac, 1.7 dtex, 5 mm, manufactured by ES Fiber Visions) 10 It comprised with the mass% and NBKP50%.
Bonding of the front and back layers was performed by pressing in a dotted manner with heat seal embossing.

(表面強度)
リントの発生の有無を評価した。テスター産業製学振式耐摩耗性試験機にて50回摩擦試験を行い、まったく毛羽立ちしないものを◎、若干毛羽が立つが繊維はとられないものを○、絡まった繊維の塊が発生したり、表面が破れたりしたものを×とした。
(吸水速度)
ピペットで300μlの水を試料に載せ、完全にシートに染み込むまでの時間を計測した。染み込んだか否かについては目視にて判断した。
(比吸水量)
10cm四方に裁断した試料を網に載せて、純水の入った容器に静かに沈め、試料に十分に水を浸透させた後に引き上げ、さらに30秒間放置した後の試料の重量を測定する。
その測定された重量から乾燥時の試料の重さを引いた値を、試料1m2当たりに換算し、さらに米坪で割った値を比吸水量とした。評価基準は、4.0以上を○、4.0未満のものを×とした。
(柔らかさ)
柔らかさと表面の滑らかさは官能評価とした。被験者が試料を実際に手にとり、柔らかさと滑らかさについてどのように感じたかにより判断をすることとした。柔らかく滑らかで拭きやすいと感じたものを◎、拭き取るのには十分な柔らかさであるものを○、硬くて拭きにくいものを×とした。
(Surface strength)
The presence or absence of lint was evaluated. 50 times of friction test was conducted with a tester industry's scientific vibration type abrasion resistance tester, ◎ if there was no fluff at all, ○ if there was some fluff but no fiber was taken, entangled fiber lump was generated , And the surface was torn.
(Water absorption speed)
300 μl of water was placed on the sample with a pipette, and the time until it completely soaked into the sheet was measured. It was judged visually whether it soaked or not.
(Specific water absorption)
A sample cut into a 10 cm square is placed on a net, gently submerged in a container containing pure water, sufficiently infiltrated with water, pulled up, and further left for 30 seconds to measure the weight of the sample.
The value obtained by subtracting the weight of the sample at the time of drying from the measured weight was converted per 1 m 2 of the sample, and the value obtained by dividing the value by the rice tsubo was defined as the specific water absorption amount. The evaluation criteria were 4.0 or higher for ◯ and less than 4.0 for X.
(soft)
The softness and smoothness of the surface were sensory evaluated. The subject actually took the sample and decided to make a judgment based on how he felt about softness and smoothness. A soft, smooth and easy-to-wipe feel was marked with ◎, a softness that was soft enough to wipe off was marked with ○, and a hard and hard-to-wipe mark was marked with X.

Figure 0004585530
Figure 0004585530

以上詳述のとおり、本発明によれば、清拭に耐えうる引張り強度があり、しかも清拭の際のケバ立ちやリントが発生し難く、さらに嵩高で柔らかさのある薄葉紙が提供される。   As described above in detail, according to the present invention, there is provided a thin paper that has a tensile strength that can withstand wiping, is resistant to flaking and lint during wiping, and is bulky and soft.

本発明は、クッキングペーパーやキッチンペーパー等の油分、水分の拭取り紙にも利用可能である。   The present invention can also be used for wiping paper for oil and moisture such as cooking paper and kitchen paper.

本発明の薄葉紙の断面概要図である。It is a cross-sectional schematic diagram of the thin paper of this invention.

10…表面層、20…裏面層、30…中間層、E…エンボス凹部、X1…薄葉紙。   DESCRIPTION OF SYMBOLS 10 ... Surface layer, 20 ... Back surface layer, 30 ... Intermediate | middle layer, E ... Embossing recessed part, X1 ... Thin paper.

Claims (1)

各層が化学繊維とパルプとを混抄した化繊混抄紙からなる3層からなり、合計米坪が40〜180g/m 2 の乾式の清拭ワイプ用薄葉紙であって、
JIS P 8113に規定される裂断長が1.0〜8.0kmであり、熱融着繊維を含み、かつ80〜140℃の範囲で熱融着機能を発揮する表裏面各層と、
クリンプ繊維を含む比容積が3〜30cm3/gの中間層とを有し、
隣接する各層相互がヒートシールエンボス加工または超音波シールにより散点状に接合されて一体化されている、ことを特徴とする薄葉紙。
Each layer is composed of three layers made of a synthetic fiber mixed paper in which chemical fibers and pulp are mixed, and is a dry wipe thin paper with a total weight of 40 to 180 g / m 2 ,
Front and back layers each having a tear length specified in JIS P 8113 of 1.0 to 8.0 km , including heat-sealing fibers, and exhibiting a heat-sealing function in the range of 80 to 140 ° C . ;
An intermediate layer having a specific volume of 3 to 30 cm 3 / g including crimp fibers ;
A thin paper characterized in that adjacent layers are joined and integrated in the form of dots by heat seal embossing or ultrasonic sealing .
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JP5191330B2 (en) * 2008-09-19 2013-05-08 大王製紙株式会社 Industrial wipes
JP5805250B2 (en) * 2014-03-28 2015-11-04 ユニ・チャーム株式会社 Wet tissue and method for producing wet tissue
JP6289211B2 (en) * 2014-03-28 2018-03-07 ユニ・チャーム株式会社 Wet tissue and method for producing wet tissue
JP5805251B2 (en) * 2014-03-28 2015-11-04 ユニ・チャーム株式会社 Wet tissue and method for producing wet tissue
JP6496576B2 (en) * 2015-03-11 2019-04-03 花王株式会社 Tissue paper
JP7038582B2 (en) * 2018-03-30 2022-03-18 大王製紙株式会社 Hydrolyzable sheet and laminate of hydrolyzable sheet

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JPH04146257A (en) * 1990-10-02 1992-05-20 Nisshinbo Ind Inc Production of base material for wet swabbing cloth
JPH04146300A (en) * 1990-10-08 1992-05-20 Chisso Corp Laminated paper
JP2000290899A (en) * 1999-04-02 2000-10-17 Kao Corp Substrate for wet sheet
JP2003507104A (en) * 1999-08-19 2003-02-25 ザ、プロクター、エンド、ギャンブル、カンパニー Multi-ply tissue with thick thickness, low density, and absorbent layer
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