JPH07207560A - Production of pulp for producing dry nonwoven fabric - Google Patents
Production of pulp for producing dry nonwoven fabricInfo
- Publication number
- JPH07207560A JPH07207560A JP6001588A JP158894A JPH07207560A JP H07207560 A JPH07207560 A JP H07207560A JP 6001588 A JP6001588 A JP 6001588A JP 158894 A JP158894 A JP 158894A JP H07207560 A JPH07207560 A JP H07207560A
- Authority
- JP
- Japan
- Prior art keywords
- pulp
- producing
- salt
- dry
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はパルプを乾式で解繊し、
乾式でウエッブを形成し不織布もしくはパルプウエッブ
吸収体を製造するために供するパルプの製造方法に関す
るものである。BACKGROUND OF THE INVENTION The present invention is a method of defibrating pulp by a dry method,
The present invention relates to a method for producing pulp which is used for producing a nonwoven fabric or a pulp web absorber by forming a web by a dry method.
【０００２】[0002]
【従来の技術】乾式でパルプを解繊し、乾式でウエッブ
を形成する乾式不織布製造工程では、パルプの離解時、
解繊時および風送中に発生する静電気によるパルプのフ
ロック形成が問題となる。このためウエッブ形成までの
工程を水蒸気等で高湿に維持したり、水をスプレー等で
噴霧したりしてフロックの形成をおさえているが、逆に
水滴の発生やパルプのべたつきが生じ均質なウエッブの
形成に障害となっていた。2. Description of the Related Art In a dry non-woven fabric manufacturing process in which a pulp is defibrated by a dry method and a web is formed by a dry method, when defibrating the pulp,
Floc formation of pulp due to static electricity generated during defibration and during air blowing becomes a problem. For this reason, the process up to web formation is maintained at high humidity with water vapor or the like, or water is sprayed to suppress the formation of flocs, but conversely, water droplets are generated or the pulp becomes sticky and is uniform. It was an obstacle to the formation of the web.
【０００３】[0003]
【発明が解決しようとする課題】この静電気の発生は、
パルプの乾式解繊及び風送により非導電体であるパルプ
（セルロース）同士の摩擦により生ずるもので、この静
電気により、一度解繊され分散していたパルプ同士が凝
集し、フロックや小塊を生成してウエッブ（マット）形
成工程で空気中に均一なパルプの分散懸濁ができなくな
り、不織布としてのマットの地合いを悪化させる重大欠
点となり現れる。The generation of static electricity is
This is caused by friction between pulp (cellulose), which is a non-conductive material, due to dry defibration and air blowing of pulp. The static electricity causes the pulps that have been defibrated and dispersed to agglomerate to form flocs and small particles. As a result, it becomes impossible to uniformly disperse and suspend the pulp in the air in the web (mat) forming step, resulting in a serious defect that deteriorates the texture of the mat as a nonwoven fabric.
【０００４】本発明の目的は、乾式不織布製造工程での
静電気の発生を抑え、均一なマットの得られる乾式不織
布製造用パルプの製造方法を提供するものであり、更に
詳しくは安価で操業性に優れ、ばらつきの少ない帯電防
止能の良好な該パルプの製造方法を提供するものであ
り、特にＮａ塩を内添して用いた場合に選択的にＮａ+
をパルプに吸着させることのできる該パルプの製造方法
を提供するものである。An object of the present invention is to provide a method for producing a pulp for producing a dry non-woven fabric, which can suppress generation of static electricity in the process for producing a dry non-woven fabric and obtain a uniform mat. It is intended to provide a method for producing the pulp which is excellent and has good antistatic ability with less variation, and particularly when Na salt is internally added and used, Na + is selectively added.
The present invention provides a method for producing the pulp, which allows the pulp to be adsorbed on the pulp.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上記課題
を解決するために鋭意研究を行った結果、パルプスラリ
ーのＰＨを５．０以上にしてＮａ塩を内添することによ
り解繊時および風送中の静電気発生を抑制した不織布製
造適性の高いパルプの製造方法を完成したものである。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the pulp slurry has a pH of 5.0 or more and is internally defibrated by adding Na salt. The present invention has completed a method for producing a pulp having high suitability for producing a non-woven fabric, which suppresses the generation of static electricity during time and during blowing.
【０００６】具体的には、パルプシートもしくはパルプ
ロールを製造するパルプマシンのフローボックス以前の
工程で、 パルプスラリーをＰＨ５．０以上に調整し、特に好ま
しくはＰＨ６．０〜７．０にコントロールすること、 パルプ中のＮａ含有量は、抽出Ｎａ+ として絶乾パル
プに対し１００ｐｐｍ以上、特に好ましくは１５０〜３
５０ｐｐｍとなるようにＮａ塩を内添し、 Ｎａ塩は無機Ｎａ塩を、更に好ましくはＮａ2ＳＯ4を
採用する、ことにより達成される。Specifically, the pulp slurry is adjusted to pH 5.0 or more, particularly preferably PH 6.0 to 7.0 in a process before the flow box of a pulp machine for producing a pulp sheet or a pulp roll. The content of Na in the pulp is 100 ppm or more, and particularly preferably 150 to 3 with respect to the absolutely dry pulp as extracted Na +.
It is achieved by internally adding a Na salt so as to be 50 ppm, and as the Na salt, an inorganic Na salt is used, and more preferably Na 2 SO 4 is used.
【０００７】本発明で言うパルプマシーンのフローボッ
クス以前の工程とは、蒸解もしくは晒洗浄工程以後で、
一般的にはシックナー、高濃度チェスト、マシンチェス
ト、ヘッドボックスからフローボックスへ至る工程であ
る。Ｎａ塩の内添はこれらの工程のいずれかで行えば良
い。The process before the flow box of the pulp machine referred to in the present invention means that after the cooking or bleaching washing process,
Generally, it is a process from thickener, high-concentration chest, machine chest, head box to flow box. Internal addition of Na salt may be performed in any of these steps.
【０００８】無機Ｎａ塩としては、Ｎａ2ＳＯ4、ＮａＨ
ＣＯ3、ＮａＣｌ、ＮａＣＯ3、ＮａＮＯ3等が使用可能
であるが、パルプ製造工場ではＮａ2ＳＯ4が入手や取り
扱いが容易で安全性も高く使用上有利である。Inorganic Na salts include Na 2 SO 4 and NaH
CO 3 , NaCl, NaCO 3 , NaNO 3 and the like can be used, but Na 2 SO 4 is easy to obtain and handle at the pulp manufacturing plant and is highly safe and advantageous in use.
【０００９】Ｎａ塩をパルプに付与する方法として、内
添以外にパルプマシーンにおいて塗布（スプレーも含
む）、含浸することが考えられるが、乾式不織布用のパ
ルプの帯電防止能の改善には内添が極めて有効であるこ
とが判明した。As a method for applying Na salt to the pulp, it is possible to apply (including spraying) and impregnate in a pulp machine in addition to the internal addition. However, in order to improve the antistatic ability of the pulp for dry non-woven fabric, internal addition is required. Was found to be extremely effective.
【００１０】例えば、Ｎａ2ＳＯ4を使用した場合、塗布
で付与した場合はパルプ中のＮａ+／ＳＯ4 --の存在比率
は、その分子量比に相当するおよそ１／２になるが、内
添した場合には１／２以上になり、パルプ中にＮａ+ が
遊離した形で存在するようになる。ここでＮａ+／ＳＯ4
--比はパルプスラリーのＰＨによって変化し、ＰＨ５．
０以上、特に６．０〜７．０にコントロールすることで
２〜４になし得ることを見いだした。このパルプに遊離
の形で存在するＮａ+ が帯電防止能の改善に寄与してい
る。[0010] For example, when using Na 2 SO 4, Na + / SO 4 in pulp If granted by the coating - existence ratio of is comprised approximately half corresponding to the molecular weight ratio, the inner When added, the amount becomes 1/2 or more, and Na + is present in the pulp in a free form. Where Na + / SO 4
- The ratio varies depending PH pulp slurry, PH5.
It was found that by controlling to 0 or more, particularly 6.0 to 7.0, 2 to 4 can be achieved. Na + present in a free form in this pulp contributes to the improvement of the antistatic ability.
【００１１】[0011]
【実施例】以下に実施例により本発明についてさらに詳
細な説明を行うが、本発明はこれに限定されるものでは
ない。なお、文中％とあるのは、特に断りのない限り重
量％である。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In addition, "%" in the text means "% by weight" unless otherwise specified.
【００１２】実施例１〜７、比較例１ ＪＩＳ−Ｐ８２０９の方法に準じて、ＮＢＫＰパルプシ
ートを離解し、パルプ濃度（以下Ｐｃと表す）約１．５
％のパルプスラリーを作成し、脱水してＰｃ＝１８％の
パルプマットを作った。これにＮａ塩溶液を添加しなが
ら希釈しさらにＮａＯＨ溶液でＰＨ＝６．５に調整して
Ｐｃ＝１％のパルプスラリーを得た。これを用いて手抄
機で絶乾米坪で６００ｇ／ｍ2 となるように計量して手
抄し、風乾してＰｃ≒９３％のパルプシートを得た。Examples 1 to 7 and Comparative Example 1 According to the method of JIS-P8209, NBKP pulp sheets were disintegrated and the pulp concentration (hereinafter referred to as Pc) was about 1.5.
% Pulp slurry was made and dewatered to make a Pc = 18% pulp mat. A Na salt solution was added to the mixture to dilute it, and the pH was adjusted to 6.5 with a NaOH solution to obtain a pulp slurry with Pc = 1%. Using this, a hand-paper machine was used to weigh 600 g / m 2 of absolutely dry tsubo, hand-paper-making, and air-drying to obtain a pulp sheet of Pc≅93%.
【００１３】測定および評価（１） このシートを、家庭用ミキサーを用いて乾式解繊を行
い、充分に解繊された状態から３０秒および６０秒後の
静電気量を集電式電位測定器により測定し、静電気量
（ＫＶ）およびその半減期を比較した。その結果を表１
に示す。Measurement and Evaluation (1) This sheet was subjected to dry defibration using a household mixer, and the static electricity amount after 30 seconds and 60 seconds from the fully defibrated state was measured with a current collector-type potential measuring device. It was measured and the amount of static electricity (KV) and its half-life were compared. The results are shown in Table 1.
Shown in.
【００１４】[0014]
【表１】 [Table 1]
【００１５】実施例８、比較例２〜５ 実プラントによる製造テストを行った。プラントは晒後
洗浄されたＮＢＫＰのシックナー、高濃度チェスト、マ
シンチェスト、ヘッドボックス、以下抄き取り、乾燥、
巻き上げ工程を含むパルプマシンへと続く工程で構成さ
れており、Ｎａ塩としてはＮａ2ＳＯ4２０％溶液をポン
プでシックナーにて対絶乾パルプＮａ+ で０．１〜０．
２ｇ／パルプｋｇとなるように添加し、高濃度チェスト
でパルプスラリーのＰＨが５．４〜６．７になるように
ＮａＯＨ溶液を添加しＰＨ調整を行った。なお、比較の
ためＮａ2ＳＯ4５％溶液をパルプマシーンの乾燥ゾーン
入り口で上記と同じ対絶乾パルプＮａ+ となるようにス
プレー塗布を行った。Example 8 and Comparative Examples 2 to 5 A production test was conducted using an actual plant. The plant is NBKP thickener, high-concentration chest, machine chest, headbox, which is washed after bleaching, papermaking, drying,
Hoist is composed of a subsequent step into the pulp machine comprising the step, as the Na salt Na 2 SO 4 20% solution Thickener at vs. absolute dry pulp Na + in the pump from 0.1 to 0.
The pH was adjusted by adding 2 g / kg of pulp, and adding a NaOH solution in a high-concentration chest so that the pH of the pulp slurry would be 5.4 to 6.7. For comparison, a 5% Na 2 SO 4 solution was spray-applied at the entrance of the drying zone of the pulp machine so that the same dry pulp Na + as the above was obtained.
【００１６】測定および評価（２） テスト中、パルプスラリーのＰＨと経時的に対応する巻
上リールパルプサンプルのＮａ+ およびＳＯ4 -- の抽出
イオン濃度を測定し、サンプルは不織布マシンにて解
繊、マット形成し、静電気によるフロックの発生状況を
評価した。その結果を表２に示す。[0016] During the measurement and evaluation (2) test, Na + and SO 4 in the PH and over time corresponding winding on the reel pulp samples pulp slurry - measuring the extracted ion concentration, the sample solution at nonwovens machine Fibers and mats were formed, and the occurrence of flock due to static electricity was evaluated. The results are shown in Table 2.
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【発明の効果】以上詳述したように、本発明の方法によ
りＰＨ調整とＮａ塩の添加により、静電気の発生量が減
少し、３０秒後、６０秒後の値そのものが小さくなり、
半減期も大幅に短くなっている。また、実プラントでの
テストでもその効果が確認され、ＰＨ調整とＮａ塩の内
添添加によりＮａ+ リッチな吸着が起こっており、優れ
た静電気フロック発生防止能を示すのに対し、内添によ
らないＮａ塩の付着法では効果がほとんど得られないこ
とが判明した。As described in detail above, by adjusting the pH and adding Na salt by the method of the present invention, the amount of static electricity generated is reduced, and the value itself after 30 seconds and 60 seconds is reduced.
The half-life is also greatly shortened. Moreover, the effect was confirmed in the test in the actual plant, and the Na + rich adsorption occurred due to the pH adjustment and the internal addition of Na salt, which showed an excellent electrostatic floc generation preventing ability. It was found that the effect is hardly obtained by the Na salt attachment method which does not depend on the above.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山口 裕之 東京都江戸川区東篠崎２−３−２ 本州製 紙株式会社開発研究所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyuki Yamaguchi 2-3-2 Higashishinozaki, Edogawa-ku, Tokyo Honshu Paper Co., Ltd.
Claims (5)
するパルプマシーンにおいて、フローボックス以前の工
程で、パルプスラリーのＰＨを５．０以上に調整し、絶
乾パルプに対し抽出Ｎａ+ が１００ｐｐｍ以上になるよ
うにＮａ塩を内添することを特徴とする乾式不織布製造
用パルプの製造方法。1. In a pulp machine for producing a pulp sheet or a pulp roll, the pH of the pulp slurry is adjusted to 5.0 or more in the process before the flow box, and the extracted Na + becomes 100 ppm or more with respect to the absolutely dried pulp. A method for producing a pulp for producing a dry non-woven fabric, which comprises internally adding a Na salt as described above.
調整した請求項１記載の乾式不織布用パルプの製造方
法。2. The method for producing a pulp for dry non-woven fabric according to claim 1, wherein the pH of the pulp slurry is adjusted to 6.0 to 7.0.
５０ｐｐｍになるようにＮａ塩を内添した請求項１〜２
記載の乾式不織布用パルプの製造方法。3. Extracted Na + is 150 to 3 with respect to absolutely dried pulp.
A Na salt is internally added so as to have a concentration of 50 ppm.
A method for producing the dry non-woven fabric pulp according to claim 1.
る塩である請求項１〜３記載の乾式不織布用パルプの製
造方法。4. The method for producing a dry nonwoven fabric pulp according to claim 1, wherein the internally added Na salt is a salt selected from inorganic Na salts.
ｍ以上となるように内添する無機Ｎａ塩がＮａ2ＳＯ4で
あり、パルプスラリーのＰＨを５．０以上に調整するこ
とにより抽出イオンの比（Ｎａ+／ＳＯ4 --）を１．５以
上とすることを特徴とする乾式不織布製造用パルプの製
造方法。5. Extracted Na + is 100 pp for absolutely dry pulp.
Inorganic Na salt internally added such that the above m is Na 2 SO 4, the ratio of the extracted ion by adjusting the PH of the pulp slurry to 5.0 or higher (Na + / SO 4 -) 1. A method for producing a pulp for producing a dry non-woven fabric, which is characterized in that the number is 5 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6001588A JPH07207560A (en) | 1994-01-12 | 1994-01-12 | Production of pulp for producing dry nonwoven fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6001588A JPH07207560A (en) | 1994-01-12 | 1994-01-12 | Production of pulp for producing dry nonwoven fabric |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07207560A true JPH07207560A (en) | 1995-08-08 |
Family
ID=11505681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6001588A Pending JPH07207560A (en) | 1994-01-12 | 1994-01-12 | Production of pulp for producing dry nonwoven fabric |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07207560A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008516819A (en) * | 2004-10-20 | 2008-05-22 | エシコン・インコーポレイテッド | Reinforced absorbent multilayer fabric for medical devices and method for producing the same |
| JP2009533568A (en) * | 2006-04-10 | 2009-09-17 | エシコン・インコーポレイテッド | Absorbent reinforced multilayer fabric for use in medical devices and method of manufacture |
| US9358318B2 (en) | 2004-10-20 | 2016-06-07 | Ethicon, Inc. | Method of making a reinforced absorbable multilayered hemostatic wound dressing |
| US9439997B2 (en) | 2004-10-20 | 2016-09-13 | Ethicon, Inc. | Reinforced absorbable multilayered hemostatis wound dressing |
-
1994
- 1994-01-12 JP JP6001588A patent/JPH07207560A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008516819A (en) * | 2004-10-20 | 2008-05-22 | エシコン・インコーポレイテッド | Reinforced absorbent multilayer fabric for medical devices and method for producing the same |
| JP2012122187A (en) * | 2004-10-20 | 2012-06-28 | Ethicon Inc | Reinforced absorbent multi-layered fabric for medical instruments and manufacturing method thereof |
| US9358318B2 (en) | 2004-10-20 | 2016-06-07 | Ethicon, Inc. | Method of making a reinforced absorbable multilayered hemostatic wound dressing |
| US9439997B2 (en) | 2004-10-20 | 2016-09-13 | Ethicon, Inc. | Reinforced absorbable multilayered hemostatis wound dressing |
| JP2009533568A (en) * | 2006-04-10 | 2009-09-17 | エシコン・インコーポレイテッド | Absorbent reinforced multilayer fabric for use in medical devices and method of manufacture |
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