JPH04209899A - Production of liquid-absorbing sheet - Google Patents
Production of liquid-absorbing sheetInfo
- Publication number
- JPH04209899A JPH04209899A JP2339038A JP33903890A JPH04209899A JP H04209899 A JPH04209899 A JP H04209899A JP 2339038 A JP2339038 A JP 2339038A JP 33903890 A JP33903890 A JP 33903890A JP H04209899 A JPH04209899 A JP H04209899A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- resin
- resin powder
- absorbing
- absorbent
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229920005989 resin Polymers 0.000 claims abstract description 127
- 239000011347 resin Substances 0.000 claims abstract description 127
- 239000000843 powder Substances 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 239000011087 paperboard Substances 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 15
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 7
- 239000000057 synthetic resin Substances 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- 239000002250 absorbent Substances 0.000 claims description 77
- 230000002745 absorbent Effects 0.000 claims description 38
- 239000004840 adhesive resin Substances 0.000 claims description 35
- 229920006223 adhesive resin Polymers 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 238000007765 extrusion coating Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 4
- 239000012466 permeate Substances 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 7
- 235000013305 food Nutrition 0.000 abstract description 5
- 238000004078 waterproofing Methods 0.000 abstract description 5
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract 5
- 239000012943 hotmelt Substances 0.000 abstract 4
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 239000011247 coating layer Substances 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 239000003921 oil Substances 0.000 description 11
- 239000000123 paper Substances 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 6
- 239000004745 nonwoven fabric Substances 0.000 description 5
- 229920000058 polyacrylate Polymers 0.000 description 5
- -1 polyethylene Polymers 0.000 description 5
- 229920013716 polyethylene resin Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000578 graft copolymer Polymers 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 235000013194 Lyophyllum decastes Nutrition 0.000 description 1
- 240000005856 Lyophyllum decastes Species 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- MSWXGRFAOYXBBF-UHFFFAOYSA-N ethenyl acetate;methyl 2-methylprop-2-enoate Chemical compound CC(=O)OC=C.COC(=O)C(C)=C MSWXGRFAOYXBBF-UHFFFAOYSA-N 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 235000013550 pizza Nutrition 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、食品等から生じる水基気やトリ・ノブ、ある
いは揚げ物の余分な油等を吸収、除去し、食品の味覚を
保持するための、吸液性シートを製造する方法に関する
。[Detailed Description of the Invention] <Industrial Application Field> The present invention is a method for absorbing and removing water base air, trinobu, etc. generated from foods, etc., or excess oil of fried foods, and preserving the taste of foods. The present invention relates to a method of manufacturing a liquid absorbent sheet.
〈従来の技術〉
従来、この種の包装材料としては、例えば特公昭６３−
１９５４５号公報、実開昭５８−１２６９８６号公報、
特開平２−８０４８号公報に示されたものが知られてい
る。<Prior art> Conventionally, as this type of packaging material, for example,
19545 Publication, Utility Model Application Publication No. 58-126986,
The one disclosed in Japanese Patent Application Laid-Open No. 2-8048 is known.
特公昭６３−１９５４５号公報、実開昭５８−１２６９
８６号公報に示されたものは、高吸水性樹脂をバインダ
ーに混合し、フィルムや板紙等の基体シートに塗布し、
透水性シートで被覆するもＯであった。このもの↓こ使
用される高吸水性樹脂：ま、接着性バイングーに完全に
被覆されて′−まうので、使用する高吸水性樹脂の割Ｃ
二は吸水量が少なく、効率的ではなかった。例えば、特
公昭６３−１９５４５号公報に示されるシートの吸水性
は、約５０〜１００ ｇ／ｎ（程度であった。一方、特
開平２’−８０４８号公報に示されたものは、基体シー
トと透水性ノートの間に、高吸水性樹脂を散布し、溶融
熱接着性樹脂により基体シートと透水性ノートを積層す
ることによって、高吸水性樹脂をン容融熱接着性樹脂に
一部がｎ出した状態で埋没させ、高い吸水性を得るもの
である。このシートにおいて、前記特公昭６３−１９５
４５号公報に示されるシートと同し吸水量を得るために
必要な高吸水性樹脂の量は、上記シートの約５０％で済
む。Special Publication No. Sho 63-19545, Utility Model Publication No. Sho 58-1269
The method disclosed in Publication No. 86 involves mixing a super absorbent resin with a binder and applying it to a base sheet such as a film or paperboard.
It was also covered with a water-permeable sheet. This one ↓ The super absorbent resin used: Well, it is completely covered with the adhesive bindo, so the percentage of the super absorbent resin used is C.
The second method had a small amount of water absorption and was not efficient. For example, the water absorbency of the sheet shown in Japanese Patent Publication No. 19545/1983 was about 50 to 100 g/n (about 50 to 100 g/n). By spraying a super absorbent resin between the base sheet and the water-permeable notebook, and laminating the base sheet and the water-permeable notebook using a molten heat-adhesive resin, a portion of the super-absorbent resin is added to the molten heat-adhesive resin. This sheet is buried in an exposed state to obtain high water absorbency.
In order to obtain the same amount of water absorption as the sheet shown in Publication No. 45, the amount of super absorbent resin required is about 50% of that of the sheet described above.
〈発明が解決しようとする課題〉
前述した特開平：２−８０４８号公報Ｃコ示される吸水
性ノー１−は、特公昭６３−１９５４５号公報、実開昭
５８−１２６９８６号公報等に示されるものより高い吸
水性を得ることができ、使用する高吸水性樹脂の効率が
よく、好ましいものである。<Problems to be Solved by the Invention> The above-mentioned water absorbency No. 1 shown in Japanese Unexamined Patent Publication No. 2-8048 is disclosed in Japanese Patent Publication No. 63-19545, Japanese Utility Model Application No. 58-126986, etc. It is preferable because it can obtain higher water absorbency than the conventional one, and the efficiency of the superabsorbent resin used is good.
しかしながら、特開平２−８０４８号公報の構成である
と、基体シートが耐水性に劣る材料であった場合、溶融
熱接着性樹脂に埋没された高吸水性樹脂の一部が、前記
板紙側にも接触し、吸収した水分等が板紙に移行し、板
紙の強度が劣化してしまうといった間邪があった。特に
、吸水性シートを板紙を用いて作成し、箱状の包装容器
とした場合は、板紙の強度劣化は包装容器として重大な
欠点となる。However, with the structure of JP-A-2-8048, if the base sheet is made of a material with poor water resistance, a part of the super absorbent resin embedded in the molten heat-adhesive resin is transferred to the paperboard side. There was a problem in that the absorbed moisture, etc., transferred to the paperboard and deteriorated the strength of the paperboard. In particular, when a water-absorbent sheet is made of paperboard and used as a box-shaped packaging container, deterioration in the strength of the paperboard becomes a serious drawback as a packaging container.
そこで本発明は、板紙を用いた吸液性ノートであっても
、吸液した際、板紙の劣化がない吸液性シートを得る方
法を提供するものである。Therefore, the present invention provides a method for obtaining a liquid-absorbent sheet that does not cause deterioration of the paperboard when liquid is absorbed, even if it is a liquid-absorbent notebook using paperboard.
〈課題を解決するための手段〉
すなわち本発明は、合成樹脂皮膜からなる防水層を有す
る板紙の、前記防水層上に、吸液性を有する吸液性樹脂
粉末を散布し、次いで、前記吸液性樹脂粉末上に、溶融
熱接着性樹脂を、吸液性樹脂粉末の平均粒子径よりも薄
い厚さに押し出して吸液性樹脂粉末を被覆し、さらにそ
の上に、通液性を有し、かつ、前記吸液性樹脂粉末を透
過させない通液性シートを、熱接着性樹脂が固化する前
に被せ、圧着して、熱接着性樹脂と１ｉｌ液性ノートを
積層することを特徴とする、吸液性シートの製造方法で
ある。<Means for Solving the Problems> In other words, the present invention is a paperboard having a waterproof layer made of a synthetic resin film, in which liquid-absorbing resin powder having liquid-absorbing properties is sprinkled on the waterproof layer, and then the absorbent resin powder is A molten heat-adhesive resin is extruded onto the liquid resin powder to a thickness thinner than the average particle size of the liquid-absorbent resin powder to coat the liquid-absorbent resin powder, and a liquid-permeable resin is applied on top of the liquid-absorbent resin powder. and a liquid-permeable sheet that does not allow the liquid-absorbing resin powder to pass through is placed on the thermo-adhesive resin before it solidifies, and the thermo-adhesive resin and the 1-il liquid notebook are laminated. This is a method for manufacturing a liquid absorbent sheet.
また、板紙上に、熱可塑性樹脂を押し出しコーティング
して防水層を形成し、防水層が固化した後、防水層上に
、吸液性を有する吸液性樹脂粉末を散布し、次いで、前
記吸液性樹脂粉末上に、溶融熱接着性樹脂を、吸液性樹
脂粉末の平均粒子径よりも渭い厚さに押し出して吸液性
樹脂粉末を被覆し、さらにその上に、通液性を有し、か
つ、前記吸液性樹脂粉末を透過させない通液性シートを
、熱接着性樹脂が固化する前に被せ、圧着して、熱接着
性樹脂と通液性シートを積層することを特徴とする、吸
液性シートの製造方法である。In addition, a waterproof layer is formed by extrusion coating a thermoplastic resin on a paperboard, and after the waterproof layer is solidified, a liquid-absorbing resin powder having liquid-absorbing properties is sprinkled on the waterproof layer, and then the absorbent resin powder is sprinkled on the waterproof layer. Molten heat-adhesive resin is extruded onto the liquid resin powder to a thickness greater than the average particle size of the liquid-absorbent resin powder to coat the liquid-absorbent resin powder, and a layer of liquid permeability is added on top of the liquid-absorbent resin powder. The thermoadhesive resin and the liquid-permeable sheet are laminated by covering the heat-adhesive resin with a liquid-permeable sheet that has a liquid-absorbing resin powder and does not allow the liquid-absorbing resin powder to pass therethrough before the heat-adhesive resin is solidified, and then press-bonding the heat-adhesive resin and the liquid-permeable sheet. This is a method for manufacturing a liquid absorbent sheet.
また、合成樹脂皮膜からなる防水層を有する板紙の、前
記防水層上に、溶融熱接着性樹脂を押し出し、該熱接着
性樹脂が固化する前に、吸液性を有する吸液性樹脂粉末
を散布した、３Ａ液性を有し、かつ、前記Ｕｉ液性樹脂
粉末を透過させない通液性シートを、熱接着性樹脂が固
化する前に吸液性樹脂粉末が熱接着性樹脂に接するよう
にして重ね合わせ、圧着して、熱接着性樹脂と通液性シ
ートを積層することを特徴とする、９液性シートの製造
方法である。In addition, a molten thermoadhesive resin is extruded onto the waterproof layer of a paperboard having a waterproof layer made of a synthetic resin film, and before the thermoadhesive resin solidifies, a liquid-absorbing resin powder having liquid-absorbing properties is added. Sprinkle a liquid-permeable sheet that has 3A liquid property and does not allow the Ui liquid resin powder to pass through, so that the liquid-absorbing resin powder comes into contact with the heat-adhesive resin before the heat-adhesive resin solidifies. This is a method for producing a 9-component sheet, which is characterized by laminating a thermoadhesive resin and a liquid-permeable sheet by overlapping and pressing together.
また、板紙上に、訃可塑性樹脂を押し出しコーティング
して防水層を形成し、防水層が固化した後、該防水層上
に、溶融熱接着性樹脂を押し出し、該熱接着性樹脂が固
化する前に、吸液性を有する吸液性樹脂粉末を散布した
、通液性を有し、かつ、前記吸液性樹脂粉末を透過さゼ
ない通液性シートを、熱接着性樹脂が固化する前に吸液
性樹脂粉末が熱接着性樹脂に接するようにして重ね合わ
せ、圧着して、熱接着性樹脂き通液性シートを積層する
ことを特徴とする、吸液性シートの製造方法である。Alternatively, a waterproof layer is formed by extrusion coating a plastic resin on a paperboard, and after the waterproof layer has solidified, a molten thermoadhesive resin is extruded onto the waterproof layer, and before the thermoadhesive resin solidifies. A liquid-permeable sheet that has liquid-permeable properties and does not allow the liquid-absorbent resin powder to pass through is sprinkled with liquid-absorbent resin powder that has liquid-absorbing properties, before the heat-adhesive resin solidifies. A method for producing a liquid-absorbing sheet, which is characterized in that a liquid-permeable sheet of a thermal adhesive resin is laminated by overlapping and pressing the liquid-absorbing resin powder in contact with a thermal adhesive resin. .
〈作用〉
上述した本発明の方法により製造される吸液性シートは
、板紙と吸液性樹脂粉末の間に防水層が形成されるので
、吸液性樹脂粉末が食品からの液体を通液性ノートを介
して吸収しても、防水層二二より液体が板紙に移行する
こ止が防がれ、全体としての強度劣化が生−ないもので
ある。<Function> In the liquid-absorbent sheet produced by the method of the present invention described above, a waterproof layer is formed between the paperboard and the liquid-absorbent resin powder, so that the liquid-absorbent resin powder does not allow the liquid from the food to pass through. Even if the liquid is absorbed through the paperboard, the waterproof layer 22 prevents the liquid from transferring to the paperboard, and the overall strength does not deteriorate.
〈実施例〉
次に、図面を参照して本発明の詳細な説明する。第１図
は本発明の方法の一実施例を示す説明図、第２図は第１
図に示す実施例により得られる吸液性シートの断面図、
第３図は本発明の他の方法の実施例を示す説明図、第４
図は第３図に示す実施例により得られる吸液性シートの
断面図である。<Example> Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention, and FIG.
A cross-sectional view of a liquid absorbent sheet obtained by the example shown in the figure,
FIG. 3 is an explanatory diagram showing an embodiment of another method of the present invention, and FIG.
The figure is a sectional view of a liquid-absorbent sheet obtained by the example shown in FIG. 3.
本発明で用いる板紙（＋１は、例えば紙箱に一般的に用
いられる、坪量１５０〜７００ ｇ ／ ｎｆの板紙が
使用できる。The paperboard (+1) used in the present invention can be, for example, paperboard with a basis weight of 150 to 700 g/nf, which is commonly used for paper boxes.
板紙（１）には、防水Ｎ（２）が形成される。防水層（
２）は、水や油等の液体を板紙＋１）に移行させないた
めのものであり、合成樹脂皮膜からなる。この防水、Ｆ
Ｗ （２）は、合成樹脂フィルムを接着剤を介して積層
してもよいが、第１回、第３図に示すように、押し出し
グイ（９）から溶融熱接着性樹脂（２１ンをフィルム状
に押し出し、積層する方法かは便である。A waterproof N (2) is formed on the paperboard (1). Waterproof layer (
2) is for preventing liquids such as water and oil from transferring to the paperboard + 1), and is made of a synthetic resin film. This waterproof, F
For W (2), a synthetic resin film may be laminated with an adhesive, but as shown in Fig. The method of extruding it in a shape and layering it is a matter of convenience.
本発明で使用される吸液性樹脂粉末（３）は、水、水溶
液、油等を吸収、保持可能なもので、種々のものが知ら
れている０例えば、水、水溶液を吸収、保持可能なもの
としては、デンプン−アクリル酸ナトリウムグラフト重
合体、デンプン−アクリロニトリルグラフト重合体の加
水分解物、一部架橋されたデンプン−ポリ（メタ）アク
リル酸重合体、一部架橋されたデンプン−ポリメタクリ
ル酸メチルの加水分解物、および上記物質の塩等のデン
プン−グラフト重合系のもの、あるいはポリアクリル酸
塩の部分架橋物、ポリイソブチレン−無水マレイン酸塩
の部分架橋物、メタクリル酸メチル−酢酸ビニル共重合
体の加水分解物に代表される架橋合成樹脂系のもの等が
あげられる６例えばデンプン系のものは三洋化成■、日
澱化学から市販されており、他に、セルロース系は旭化
成工業観、ダイセル化学−から、ポリアクリル酸塩系は
■花王、日本触媒化学工業■、荒用化学■、製鉄化学株
、ライオン株、日本合成化学−１三菱油化■から、アク
リル酸塩−ビニルアルコール共重合体系は住友化学株か
ら、イソブチレン−無水マレイン酸共重合体系はクラレ
イソブレンケミカル■から、それぞれ市販されている。The liquid-absorbing resin powder (3) used in the present invention is capable of absorbing and retaining water, aqueous solutions, oil, etc., and various types are known. Examples include starch-sodium acrylate graft polymer, hydrolyzate of starch-acrylonitrile graft polymer, partially cross-linked starch-poly(meth)acrylic acid polymer, partially cross-linked starch-polymethacrylate. Hydrolyzates of methyl methacrylate, starch-graft polymerization products such as salts of the above substances, partially cross-linked polyacrylates, partially cross-linked polyisobutylene-maleic anhydrides, methyl methacrylate-vinyl acetate For example, starch-based products are commercially available from Sanyo Kasei and Nippon Kagaku, while cellulose-based products are available from Asahi Kasei Kogyo. , Daicel Chemical - polyacrylate-based ■ Kao, Nippon Shokubai Chemical ■, Aurayo Chemical ■, Steel Chemical Co., Ltd., Lion Co., Ltd., Nippon Gosei - 1 Mitsubishi Yuka ■, acrylate - vinyl alcohol The copolymer system is commercially available from Sumitomo Chemical Co., Ltd., and the isobutylene-maleic anhydride copolymer system is commercially available from Clareisobrene Chemical (■).
また、油を吸収、保持可能なものとしては、日本触媒化
学工業■、日本ゼオン■が、ポリノルボルネンを主体と
した、吸油性樹脂を開発している。これら＠、液性樹脂
（３）は、目的に応して複数種を併用することができる
。Furthermore, as materials capable of absorbing and retaining oil, Nippon Shokubai Kagaku Kogyo (■) and Nippon Zeon (■) have developed oil-absorbing resins based on polynorbornene. A plurality of types of these liquid resins (3) can be used in combination depending on the purpose.
吸液性樹脂（３）は、本発明の第１、第２の発明におい
ては、固化した状態の防水層（２）上に散布され、この
吸液性樹脂（３）上に溶融熱接着性樹脂（４）が押し出
しダイ（８）から押し出され、さらに、通液性シート（
５）が被せられて積層される。このとき溶融熱接着性Ｐ
４脂（４）は、吸液性樹脂（３）の平均粒径よりも薄く
厚さ、好ましくは吸液性樹脂（３）の平均粒径に対して
３０〜５０％の厚さに押し出され、圧着される。これに
より、吸液性樹脂（３）が熱接着性樹脂（４）により防
水Ｎ（２）上に固定されるとともに、吸液性樹脂（３）
が熱接着性樹脂（４）を突き破って通液性シ−ト（５）
側に一部露出して、Φ液性を発揮する（第２図参照〕、
熱接着性樹脂（４）の厚さが吸液性樹脂（３）の平均粒
径よりも厚い場合はも゛ちろん、上記数値よりも大きい
場合には、吸液性樹脂（３）の多くは熱接着性樹脂（４
）を突き破ることができず、実質的な吸液効果が得られ
ない、他方、熱接着性樹脂（４）の厚さが上記数値より
小さい場合には、突き破られた孔が広がり、また、吸液
性樹脂（３）と熱接着性樹脂（４）の接触面積が小さく
なるため、吸液性樹脂（３）が熱接着性樹脂（４）によ
って板紙（防水層）上に保持されなくなり、脱落してし
まう。In the first and second aspects of the present invention, the liquid-absorbent resin (3) is sprinkled on the solidified waterproof layer (2), and the liquid-absorbent resin (3) is coated with molten heat adhesive. The resin (4) is extruded from the extrusion die (8), and then the liquid-permeable sheet (
5) is covered and laminated. At this time, melt heat adhesiveness P
4 fat (4) is extruded to a thickness thinner than the average particle size of the liquid absorbent resin (3), preferably 30 to 50% of the average particle size of the liquid absorbent resin (3). , is crimped. As a result, the liquid absorbent resin (3) is fixed onto the waterproof N (2) by the thermal adhesive resin (4), and the liquid absorbent resin (3)
breaks through the thermoadhesive resin (4) and forms the liquid-permeable sheet (5).
It is partially exposed on the side and exhibits Φ liquid properties (see Figure 2).
If the thickness of the thermoadhesive resin (4) is thicker than the average particle size of the absorbent resin (3), or if it is larger than the above value, most of the absorbent resin (3) will is a thermoadhesive resin (4
), and a substantial liquid absorption effect cannot be obtained.On the other hand, if the thickness of the thermoadhesive resin (4) is smaller than the above value, the pierced hole will expand, and Since the contact area between the liquid absorbent resin (3) and the thermal adhesive resin (4) becomes smaller, the liquid absorbent resin (3) is no longer held on the paperboard (waterproof layer) by the thermal adhesive resin (4). It will fall off.
なお、吸液性樹脂（３）の平均粒径は、板紙（防水層）
上への散布作業性（飛散・散逸防止）の点から、３０ｕ
ｍ以上とすることが好ましく、他方、吸液時に膨潤して
体積増加することによる吸液性シートの凹凸化（変形）
や、吸液性樹脂（３）の脱落等を防止する目的で、Ｉ０
０７ｚｍ以下とすることが好ましい、従って、熱接着性
＃ＡＭ′８（４）は、９〜５・０μｍの厚さに押し出さ
れることが好ましい。The average particle size of the liquid-absorbing resin (3) is that of paperboard (waterproof layer).
From the point of view of upward spraying workability (scattering/scattering prevention), 30u
m or more, and on the other hand, unevenness (deformation) of the liquid absorbent sheet due to swelling and volume increase during liquid absorption.
In order to prevent the liquid absorbent resin (3) from falling off, etc., I0
Therefore, it is preferable that the thermoadhesive #AM'8 (4) is extruded to a thickness of 9 to 5.0 μm.
上記した熱接着性＠４脂（４）としては、ポリオレフィ
ン樹脂が最も一般的であり、ポリエチレン、ポリプロピ
レンが代表的な樹脂である。また、通液性ノート（５）
と巳て；よ、通液性を有する、例えはセルロース系不織
布、ポリエチレン系不織布、ポ１１プロピレン系不織布
、ポリエステル系不織布等の不織布や、紙、特に無サイ
ズ紙等の通液性の良好なシートが使用できる。この通液
性シート（５）は、前述の吸液性樹脂（３）が透過して
吸液性シートから脱落することがないよう、孔がきわめ
て小さいものであることが必要である。Polyolefin resins are most common as the above-mentioned thermally adhesive @4 resin (4), and polyethylene and polypropylene are typical resins. Also, liquid-permeable notebook (5)
For example, nonwoven fabrics that have liquid permeability, such as cellulose nonwoven fabrics, polyethylene nonwoven fabrics, polypropylene nonwoven fabrics, and polyester nonwoven fabrics, and paper, especially sizeless paper, that have good liquid permeability. Seats are available. This liquid-permeable sheet (5) needs to have extremely small pores so that the liquid-absorbent resin (3) described above does not pass through and fall off from the liquid-absorbent sheet.
本発明の第３、第４の発明においては、第３図に示すよ
うに、吸液性樹脂（３）は、板紙（］）上に形成された
防水層（２）の上に押し出しグイ（８）から押し出され
た、溶融熱接着性樹脂（４）上に散布される。この発明
において、吸液性樹脂（３）は、熱接着性樹脂（４）に
その一部が露出した状態で埋没する。従って、吸液性樹
脂（３）の散布は、熱接着性樹脂（４）が固化する前に
行われる必要があり、さらに、通液性シート（５）も、
熱接着性樹脂（４）の接着力により積層されるため、熱
接着性樹脂（４）が固化する前に被覆、圧着される必要
がある。夕お、この発明において熱接着性樹脂（４）の
厚さは、必ずしも吸液性樹脂（３）の平均粒径よりも薄
い必要はない、第４図に示すように、吸液性樹脂（３）
は熱接着性樹脂（４）を突き破らなくても、通液性シー
ト（５）側で一部が露出した状態となっているからであ
る。In the third and fourth aspects of the present invention, as shown in FIG. 3, the liquid absorbent resin (3) is extruded onto the waterproof layer (2) formed on the paperboard (). It is sprinkled on the molten thermoadhesive resin (4) extruded from 8). In this invention, the liquid-absorbing resin (3) is buried in the heat-adhesive resin (4) with a portion thereof exposed. Therefore, the liquid-absorbent resin (3) needs to be sprayed before the heat-adhesive resin (4) solidifies, and the liquid-permeable sheet (5) also needs to be sprayed.
Since the layers are laminated by the adhesive force of the heat-adhesive resin (4), it is necessary to cover and press-bond them before the heat-adhesive resin (4) solidifies. Finally, in this invention, the thickness of the thermoadhesive resin (4) does not necessarily have to be thinner than the average particle size of the liquid-absorbing resin (3). 3)
This is because even if the thermoadhesive resin (4) is not penetrated, a portion is exposed on the liquid-permeable sheet (5) side.
つぎに、本発明の詳細な説明するが、本発明はこの実施
例に限定されるものではない。Next, the present invention will be explained in detail, but the present invention is not limited to this embodiment.
〈実施例１〉
坪１３２０ ｇ ／ポの板紙（三菱製紙輛製、商品名：
三菱ハイバール）上に、押し出しグイより溶融低密度ポ
リエチレン＃Ａ脂（三井石油化学工業■製、商品名：ミ
ラソン１６Ｐ）を厚さ３ｏｕｍのフィルム状に押し出し
、積層して防水層を形成した。この防水層が固化した後
、防水層上に、平均粒径５０μｍのポリアクリル酸塩系
高吸水性樹脂（日本触媒化学工業■製、アクアリック（
登録商標）ＣＡ ＭＬ−５０）を、パウダー散布装置
にてｌ、Ｏｇ／ｒｄの割合で散布した。この板紙／防水
層／高吸水性樹脂の積層体の高吸水性樹脂側に、通水性
の無サイズ紙（東渇パルプ■製、商品名：ＭＣＢタオル
、坪１５０ ｇ ／ ｎｊ ）を繰り出すとともに、両
者の間に押し出しグイより溶融ポリエチレン樹脂（三井
石油化学工業−製、商品名：ミラソン１６Ｐ）を厚さ２
５μｍのフィルム状に押し出し、直ちに圧着し、本発明
の吸水性シートを得た。得られた吸水性シートを観察し
たところ、高吸水性樹脂が溶融ポリエチレン樹脂を突き
破り、一部が無サイズ紙側で露出していた。なお、シー
トの峨水量は、約２１０ｇ／ｉｆであった・このシート
を所定形状に打ち抜き、箱を作成し、内容物として蒸し
た直後のシュウマイを収納したところ、内容物から生し
る水蒸気を吸水性樹脂が吸収、除去し、内容物の味覚が
低下することがなかった。また、板紙には全く水が移行
せず、箱としての強度が保たれた。<Example 1> Paperboard of 1320 g/Po (manufactured by Mitsubishi Paper Corporation, product name:
A molten low-density polyethylene #A resin (manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason 16P) was extruded into a film with a thickness of 3 um using an extruder and laminated on top of Mitsubishi Hybar (Mitsubishi Hybar) to form a waterproof layer. After this waterproof layer has solidified, a polyacrylate-based super water absorbent resin (manufactured by Nippon Shokubai Chemical Co., Ltd., Aqualic) with an average particle size of 50 μm is placed on the waterproof layer.
(registered trademark) CA ML-50) was sprayed at a rate of 1,0 g/rd using a powder spraying device. On the super absorbent resin side of this paperboard/waterproof layer/super absorbent resin laminate, water permeable sizeless paper (manufactured by Tosu Pulp ■, trade name: MCB towel, tsubo 150 g/nj) is rolled out, and Between the two, apply molten polyethylene resin (manufactured by Mitsui Petrochemical Industries, product name: Mirason 16P) to a thickness of 2 by extrusion.
It was extruded into a 5 μm film and immediately pressed to obtain a water absorbent sheet of the present invention. When the obtained water-absorbent sheet was observed, it was found that the super-absorbent resin had broken through the molten polyethylene resin, and a portion was exposed on the non-size paper side. The amount of water added to the sheet was approximately 210 g/if. When this sheet was punched out into a predetermined shape to make a box and the steamed shumai was stored as the contents, the water vapor generated from the contents was removed. The water-absorbing resin absorbed and removed the contents, and the taste of the contents did not deteriorate. Furthermore, no water migrated to the paperboard, and the box maintained its strength.
〈実施例２〉
坪１３２０ｇ／ｒｒｌの板紙（三菱製紙銖製、商品名：
三菱ハイバール）上に、押し出しグイより溶融低密度ポ
リエチレン樹脂（三井石油化学工業■製、商品名：ミラ
ソン１６Ｐ）を厚さ３０μｍのフィルム状に押し出し、
積層して防水層を形成した。<Example 2> Paperboard of 1320 g/rrl (manufactured by Mitsubishi Paper Co., Ltd., product name:
Extrude molten low-density polyethylene resin (manufactured by Mitsui Petrochemical Industries ■, product name: Mirason 16P) into a 30 μm thick film using an extruder onto Mitsubishi Hybar).
They were laminated to form a waterproof layer.
一方、通水性の無サイズ紙（東渇パルプ■製、商品名：
ＭＣＢタオル、坪量５０ｇ／ポ）上に、平均粒径５０
μｍのポリアクリル酸塩系高吸水性樹脂（日本触媒化学
工業株制、アクアリック（登録商標）ＣＡ ＭＬ−５
０）をパウダー散布装置にで０．５ｇ／ｎ（の割合で散
布した。その後、前記板紙／防水層の積層体の防水層と
、無サイズ紙の高吸水性樹脂散布側を対向させて、両者
の間に押し出しダイより熔融ポリエチレン樹脂（三井石
油化学工業■製、商品名：ミラソン１６Ｐ）を厚さ１５
μｍのフィルム状に押し出し、直ちに圧着し、本発明の
吸液性シートを得た。得られた吸液性シートを観察した
ところ、高吸水性樹脂は、−部を無サイズ紙側に露出し
た状態でポリエチレン樹脂に埋没していた。このノート
の吸水量は、約１６０ ｇ／ボであった。On the other hand, water-permeable sizeless paper (manufactured by Tosu Pulp ■, product name:
MCB towel, basis weight 50g/po), average particle size 50
μm polyacrylate-based super absorbent resin (Nippon Shokubai Chemical Industry Co., Ltd., Aqualic (registered trademark) CA ML-5
0) was sprayed at a rate of 0.5 g/n using a powder spraying device.Then, the waterproof layer of the paperboard/waterproof layer laminate and the superabsorbent resin sprayed side of the sizeless paper were made to face each other, Between the two, melt polyethylene resin (manufactured by Mitsui Petrochemical Industries ■, product name: Mirason 16P) is applied to a thickness of 15 mm using an extrusion die.
It was extruded into a μm film and immediately pressed to obtain a liquid absorbent sheet of the present invention. When the obtained liquid-absorbent sheet was observed, it was found that the super-absorbent resin was buried in the polyethylene resin with the negative part exposed to the non-size paper side. The water absorption amount of this notebook was approximately 160 g/bo.
このシートを、所定形状に打ち抜き、箱を作成巳、内容
物として焼きたてのピザパイを収納しにところ、内容物
から生しる水茶気を高吸水性樹脂が吸収、除去し、内容
物の味覚が低下することがなかった。また、板紙には全
く水が移行せず、箱としての強度が保たれた。This sheet is punched out into a predetermined shape to create a box. When the contents are to store a freshly baked pizza pie, the super absorbent resin absorbs and removes the moisture generated from the contents. There was no decrease in taste. Furthermore, no water migrated to the paperboard, and the box maintained its strength.
〈実施例３〉
坪量３２０ｇ／ポの板紙（三菱製紙■製、商品名：三菱
ハイバール）上に、押し出しダイより熔融低宙度ポリエ
チレン８４脂（三井石油化学工業蛛製、商品名：ミラソ
ン１６Ｐ）を厚さ３０μｍのフィルム状に押し出し、Ｍ
３層して防水層を形成−だ、この防水層が固化した後、
防水層上に、平均粒径５０ｐｍのポリアクリル酸塩系高
吸水性樹脂（日本触媒化学工業銖製、アクアリック（登
録商標）ＣＡ ＭＬ−５０）と、平均粒径４０ｕｍの
ポリノルポル７ン系吸油性樹脂（日本ゼオン銖製）とを
、パウダー散布装置にてそれぞれ１． Ｏｇ／ｎτの
割合で散布した。この板紙／防水層／高吸水性樹脂士吸
油性樹脂（吸液性樹脂）の積層体の吸液性樹脂側番こ、
通水性の無サイズ紙（東渇ノクルブ銖製、商品名：ＭＣ
Ｂタオル、坪１５０ ｇ／ｒｒｒ）を繰り出すとともに
、両者の間に押し出しダイより熔融ポリエチレン樹脂（
三井石油化学工業銖製、商品名：ミラ〜ソン１６Ｐ）を
厚さ２０μｍのフィルム状に押し出し、直ちに圧着し、
本発明の吸水・吸油性シートを得た。得られた吸水・吸
油性シートの吸水量は、約２１０ｇ／ポであり、吸油髪
は５０ｇ／ボであった。<Example 3> On a paperboard with a basis weight of 320 g/Po (manufactured by Mitsubishi Paper Corporation, product name: Mitsubishi Hybar), melted low coercivity polyethylene 84 resin (manufactured by Mitsui Petrochemical Industries Hina, product name: Mirason 16P) was passed through an extrusion die. ) was extruded into a film with a thickness of 30 μm, and M
Three layers form a waterproof layer. After this waterproof layer solidifies,
On the waterproof layer, a polyacrylate-based super water-absorbent resin with an average particle size of 50 pm (Nippon Shokubai Chemical Co., Ltd., Aqualic (registered trademark) CA ML-50) and a polynorpor 7-based oil absorbent with an average particle size of 40 um are placed on the waterproof layer. resin (manufactured by Nippon Zeon) using a powder scattering device. It was sprayed at a rate of Og/nτ. The liquid-absorbing resin side of this paperboard/waterproofing layer/super water-absorbing resin laminate (liquid-absorbing resin),
Water-permeable sizeless paper (manufactured by Tounokurubun, product name: MC)
B towel, tsubo 150 g/rrr) is fed out, and molten polyethylene resin (
Mitsui Petrochemical Industries Co., Ltd., product name: Mirason 16P) was extruded into a 20 μm thick film and immediately crimped.
A water/oil absorbent sheet of the present invention was obtained. The water absorption amount of the obtained water/oil absorbent sheet was about 210 g/bo, and the oil absorption of hair was 50 g/bo.
このシートを所定形状に打ち抜き、箱を作成し、内容物
として揚げだてのフライドチキンを収納したところ、内
容物から生しる水蒸気を吸水性樹脂が、また、油分を吸
油性樹脂が吸収、除去し、内容物の味覚が低下すること
がなかった。また、板紙には全く水、油が移行せず、箱
としての強度が保たれた。When this sheet was punched out into a predetermined shape to create a box and freshly fried chicken was stored as the contents, the water vapor generated from the contents was absorbed by the water absorbent resin, and the oil was absorbed by the oil absorbent resin. After removal, the taste of the contents did not deteriorate. Furthermore, no water or oil migrated to the paperboard, and the box maintained its strength.
〈発明の効果〉
以上述べたように、本発明の方法によれば、高い吸収効
率を持ち、しかも板紙には吸収した液体が移行すること
がなく、従って、シート自体の強度が低下しない吸液性
シートが得られる。このシートを用いることにより、内
容物から生しる液体を吸収しても、容器の強度低下のな
い、優れた吸液性を有する容器を製造することができる
ようになった。<Effects of the Invention> As described above, the method of the present invention has high absorption efficiency, and the absorbed liquid does not transfer to the paperboard, so the strength of the sheet itself does not decrease. A sexual sheet is obtained. By using this sheet, it has become possible to manufacture a container that has excellent liquid absorption properties and does not lose its strength even when it absorbs liquid generated from the contents.
第１図は本発明の方法の一実施例を示す説明図、第２図
は第１図に示す実施例により得られる吸液性シートの断
面図、第３図は本発明の他の方法の実施例を示す説明図
、第４図は第３図に示す実施例により得られる吸液性シ
ートの断面図である。
（１）・・・板紙
（２）・・・防水層
（３）・・・吸液性樹脂
（４）・・・熱接着性樹脂
（５）・・・通水性シート
（９）・・・押し出しダイ
（２１）・・・溶融熱可塑性樹脂FIG. 1 is an explanatory diagram showing one embodiment of the method of the present invention, FIG. 2 is a sectional view of a liquid absorbent sheet obtained by the embodiment shown in FIG. 1, and FIG. 3 is an explanatory diagram showing an example of the method of the present invention. FIG. 4 is a cross-sectional view of a liquid absorbent sheet obtained by the example shown in FIG. 3. (1)...Paperboard (2)...Waterproof layer (3)...Liquid absorbing resin (4)...Thermoadhesive resin (5)...Water permeable sheet (9)... Extrusion die (21)...molten thermoplastic resin
Claims (4)
記防水層上に、吸液性を有する吸液性樹脂粉末を散布し
、次いで、前記吸液性樹脂粉末上に、溶融熱接着性樹脂
を、吸液性樹脂粉末の平均粒子径よりも薄い厚さに押し
出して吸液性樹脂粉末を被覆し、さらにその上に、通液
性を有し、かつ、前記吸液性樹脂粉末を透過させない通
液性シートを、熱接着性樹脂が固化する前に被せ、圧着
して、熱接着性樹脂と通液性シートを積層することを特
徴とする、吸液性シートの製造方法。(1) A liquid-absorbing resin powder having liquid-absorbing properties is sprinkled on the waterproof layer of a paperboard having a waterproof layer made of a synthetic resin film, and then a melt-thermal adhesive is applied onto the liquid-absorbing resin powder. The resin is extruded to a thickness thinner than the average particle diameter of the liquid-absorbent resin powder to cover the liquid-absorbent resin powder, and then the liquid-absorbent resin powder, which has liquid permeability and is coated on top of the liquid-absorbent resin powder, is extruded to a thickness thinner than the average particle diameter of the liquid-absorbent resin powder. A method for manufacturing a liquid-absorbing sheet, characterized in that a liquid-permeable sheet that does not permeate the heat-adhesive resin is covered with a liquid-permeable sheet before the heat-adhesive resin solidifies, and the heat-adhesive resin and the liquid-permeable sheet are laminated.
して防水層を形成し、防水層が固化した後、防水層上に
、吸液性を有する吸液性樹脂粉末を散布し、次いで、前
記吸液性樹脂粉末上に、溶融熱接着性樹脂を、吸液性樹
脂粉末の平均粒子径よりも薄い厚さに押し出して吸液性
樹脂粉末を被覆し、さらにその上に、通液性を有し、か
つ、前記吸液性樹脂粉末を透過させない通液性シートを
、熱接着性樹脂が固化する前に被せ、圧着して、熱接着
性樹脂と通液性シートを積層することを特徴とする、吸
液性シートの製造方法。(2) A waterproof layer is formed by extrusion coating a thermoplastic resin on a paperboard, and after the waterproof layer is solidified, a liquid-absorbing resin powder having liquid-absorbing properties is sprinkled on the waterproof layer. The liquid-absorbent resin powder is coated with a liquid-absorbent resin powder by extruding a molten heat-adhesive resin to a thickness thinner than the average particle diameter of the liquid-absorbent resin powder, and then liquid permeability is added on top of the liquid-absorbent resin powder. The thermoadhesive resin and the liquid-permeable sheet are laminated by covering the heat-adhesive resin with a liquid-permeable sheet that has a liquid-absorbing resin powder and does not allow the liquid-absorbing resin powder to pass therethrough before the heat-adhesive resin is solidified, and then press-bonding the heat-adhesive resin and the liquid-permeable sheet. A method for manufacturing a liquid absorbent sheet.
記防水層上に、溶融熱接着性樹脂を押し出し、該熱接着
性樹脂が固化する前に、吸液性を有する吸液性樹脂粉末
を散布した、通液性を有し、かつ、前記吸液性樹脂粉末
を透過させない通液性シートを、熱接着性樹脂が固化す
る前に吸液性樹脂粉末が熱接着性樹脂に接するようにし
て重ね合わせ、圧着して、熱接着性樹脂と通液性シート
を積層することを特徴とする、吸液性シートの製造方法
。(3) Extrude a molten heat-adhesive resin onto the waterproof layer of a paperboard having a waterproof layer made of a synthetic resin film, and before the heat-adhesive resin solidifies, liquid-absorbent resin powder having liquid-absorbing properties A liquid-permeable sheet that has liquid permeability and does not allow the liquid-absorbing resin powder to pass through is sprayed with the liquid-absorbing resin powder so that the liquid-absorbing resin powder comes into contact with the thermal adhesive resin before the thermal adhesive resin solidifies. A method for manufacturing a liquid-absorbing sheet, which comprises laminating a thermoadhesive resin and a liquid-permeable sheet by stacking them together and pressing them together.
して防水層を形成し、防水層が固化した後、該防水層上
に、溶融熱接着性樹脂を押し出し、該熱接着性樹脂が固
化する前に、吸液性を有する吸液性樹脂粉末を散布した
、通液性を有し、かつ、前記吸液性樹脂粉末を透過させ
ない通液性シートを、熱接着性樹脂が固化する前に吸液
性樹脂粉末が熱接着性樹脂に接するようにして重ね合わ
せ、圧着して、熱接着性樹脂と通液性シートを積層する
ことを特徴とする、吸液性シートの製造方法。(4) A waterproof layer is formed by extrusion coating a thermoplastic resin on a paperboard, and after the waterproof layer is solidified, a molten thermoadhesive resin is extruded onto the waterproof layer, and the thermoadhesive resin is solidified. Before the heat-adhesive resin solidifies, a liquid-permeable sheet that has liquid-permeable properties and does not allow the liquid-absorbent resin powder to pass through is sprinkled with liquid-absorbent resin powder that has liquid-absorbing properties. A method for producing a liquid-absorbent sheet, which comprises laminating a liquid-absorbing resin powder and a liquid-permeable sheet by overlapping and pressing the liquid-absorbing resin powder in contact with a thermal adhesive resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2339038A JP2569953B2 (en) | 1990-11-30 | 1990-11-30 | Method for producing liquid-absorbent sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2339038A JP2569953B2 (en) | 1990-11-30 | 1990-11-30 | Method for producing liquid-absorbent sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04209899A true JPH04209899A (en) | 1992-07-31 |
| JP2569953B2 JP2569953B2 (en) | 1997-01-08 |
Family
ID=18323685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2339038A Expired - Fee Related JP2569953B2 (en) | 1990-11-30 | 1990-11-30 | Method for producing liquid-absorbent sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2569953B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7078075B1 (en) | 1995-02-23 | 2006-07-18 | H.B. Fuller Licensing & Financing Inc. | Method for producing a continuous thermoplastic coating and articles constructed therefrom |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028048A (en) * | 1988-06-28 | 1990-01-11 | Eiwa Kagaku Kogyo Kk | Water-absorptive sheet |
| JPH0274398U (en) * | 1988-11-28 | 1990-06-06 |
-
1990
- 1990-11-30 JP JP2339038A patent/JP2569953B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028048A (en) * | 1988-06-28 | 1990-01-11 | Eiwa Kagaku Kogyo Kk | Water-absorptive sheet |
| JPH0274398U (en) * | 1988-11-28 | 1990-06-06 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7078075B1 (en) | 1995-02-23 | 2006-07-18 | H.B. Fuller Licensing & Financing Inc. | Method for producing a continuous thermoplastic coating and articles constructed therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2569953B2 (en) | 1997-01-08 |
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