JP2971887B2 - Absorbent articles - Google Patents
Absorbent articlesInfo
- Publication number
- JP2971887B2 JP2971887B2 JP1013486A JP1348689A JP2971887B2 JP 2971887 B2 JP2971887 B2 JP 2971887B2 JP 1013486 A JP1013486 A JP 1013486A JP 1348689 A JP1348689 A JP 1348689A JP 2971887 B2 JP2971887 B2 JP 2971887B2
- Authority
- JP
- Japan
- Prior art keywords
- absorbent article
- liquid
- ear piece
- longitudinal direction
- opposed
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高度な防漏性をもつ吸収性物品、特に生理用
ナプキン、使い捨てオムツ、失禁用パッドなどの吸収性
物品に関するものである。Description: TECHNICAL FIELD The present invention relates to an absorbent article having a high leak-proof property, in particular, an absorbent article such as a sanitary napkin, a disposable diaper, and an incontinence pad.
従来の吸収性物品、例えば、生理用ナプキンあるいは
使い捨てオムツは、基本的に、液体透過性の表面材、液
体保持性の吸収体、液体不透過性の防漏材からなる。Conventional absorbent articles, such as sanitary napkins or disposable diapers, basically consist of a liquid-permeable surface material, a liquid-retentive absorber, and a liquid-impermeable leakproof material.
近年、急速な技術の進歩に伴い、吸収性ポリマー、疎
水性表面材などの新しい素材を導入することにより、吸
収性能の向上が図られてきた。しかし、これらの個々に
は優れた性能を持つ素材を組み合わせた吸収性物品も実
際の使用時においては、本来の性能を十分に発揮してい
るとは言えない。これは、このような吸収性物品に対す
る使用者の第１の不満点が、依然として股間部や臀部か
らの漏れであることからも明らかである。In recent years, with the rapid progress of technology, the absorption performance has been improved by introducing new materials such as absorbent polymers and hydrophobic surface materials. However, it cannot be said that an absorbent article in which these materials each having excellent performance are combined sufficiently exhibits the original performance in actual use. This is evident from the fact that the user's first dissatisfaction with such absorbent articles is still leakage from the crotch and buttocks.
この漏れの最も大きな原因は、使用者の運動などによ
り吸収性物品に不規則な応力が加わり、吸収性物品が所
定の位置から移動してしまったり、吸収性物品に不規則
な変形が生じたりするためである。The biggest cause of this leakage is that irregular stress is applied to the absorbent article due to movement of the user and the absorbent article moves from a predetermined position, or irregular deformation occurs in the absorbent article. To do that.
そこで、第６図に示すように、吸収性物品１の縦方向
の中央の位置において、幅方向側端から可撓性の耳片２
を延出させ、第８図に示すように使用時に衣類７に固定
することにより、防漏性を改善する技術が数多く提案さ
れている。Therefore, as shown in FIG. 6, the flexible ear piece 2 is positioned at the center in the longitudinal direction of the absorbent article 1 from the side end in the width direction.
A number of techniques have been proposed to improve the leakproofness by extending the garment and fixing it to the garment 7 at the time of use as shown in FIG.
尚、第７図は第６図のイ−イ′線断面図であり、３は
防漏材、４は表面材、６は吸収体である。FIG. 7 is a sectional view taken along the line II 'of FIG. 6, wherein 3 is a leak-proof material, 4 is a surface material, and 6 is an absorber.
確かに、上記のような技術を用いれば、股間部からの
漏れは効果的に防止できるが、臀部からの漏れは殆ど防
止できない。Certainly, the use of the technique described above can effectively prevent leakage from the crotch, but can hardly prevent leakage from the buttocks.
以上のように、従来の技術では、臀部からの漏れを効
果的に防止する技術がなかったため、これが吸収性物品
の防漏性の向上の大きな障害となっていた。As described above, in the related art, there was no technique for effectively preventing leakage from the buttocks, and this was a major obstacle to improving the leakproofness of the absorbent article.
そこで本発明者らは、股間部からの漏れは勿論のこ
と、臀部からの漏れを効果的に防止すべく、鋭意研究を
重ねた結果、本発明を完成するに至った。The inventors of the present invention have conducted intensive studies in order to effectively prevent leakage from the crotch and from the buttocks, and as a result, have completed the present invention.
即ち、本発明は、液体透過性の表面材、液体保持性の
吸収体、及び液体不透過性の防漏材を順次積層して成る
実質的に縦長の吸収性物品において、吸収体の使用者の
肌に対向すべき面及び使用者の衣類に対向すべき面が表
面材により被覆され、使用者の肌に対向すべき面に位置
する部分の表面材は液体透過性を有するが、使用者の衣
類に対向すべき面に位置する部分の表面材は液体透過性
を実質的に有さず、また該吸収性物品の縦方向に偏倚し
た位置で幅方向両側端から、防漏材を吸収性物品の幅方
向両側端から延出させることにより形成された可撓性の
耳片が延出しており、吸収性物品の縦方向を二等分する
中心線と耳片の縦方向を二等分する中心線とは少なくと
も10mm以上遊離しており、さらに耳片乃至は吸収性物品
本体に、粘着剤が設けられていることを特徴とする吸収
性物品を提供するものである。That is, the present invention relates to a substantially vertically absorbent article formed by sequentially laminating a liquid-permeable surface material, a liquid-retentive absorber, and a liquid-impermeable leakproof material. The surface to be opposed to the skin of the user and the surface to be opposed to the clothing of the user are covered with the surface material, and the surface material of the portion located on the surface to be opposed to the skin of the user has liquid permeability, The surface material of the portion located on the surface to be opposed to the garment has substantially no liquid permeability, and absorbs the leakproof material from both ends in the width direction at a position deviated in the longitudinal direction of the absorbent article A flexible ear piece formed by extending from both ends in the width direction of the absorbent article extends, and a center line bisecting a longitudinal direction of the absorbent article and a longitudinal direction of the ear piece are equal. The separating center line is separated by at least 10 mm or more, and an adhesive is provided on the ear piece or the absorbent article main body. It is intended to provide an absorbent article characterized in that the absorbent article is manufactured.
以下、本発明を図面に基づいて、更に詳細に説明す
る。Hereinafter, the present invention will be described in more detail with reference to the drawings.
第１図は本発明に係わる吸収性物品の一実施例を示す
正面図であり、第２図は第１図のハ−ハ′線における断
面図、第５図はその衣類への固定方法を示す図である。
また第３図及び第４図は比較の吸収性物品の第２図に相
当する断面図である。FIG. 1 is a front view showing an embodiment of the absorbent article according to the present invention, FIG. 2 is a cross-sectional view taken along line H--A 'of FIG. 1, and FIG. FIG.
3 and 4 are sectional views corresponding to FIG. 2 of a comparative absorbent article.
本発明の吸収性物品は第６図に示される従来の吸収性
物品とは異なり、吸収性物品１の縦方向に偏倚した位置
で幅方向側端から可撓性の耳片２が延出しているため、
液体が排泄される点に概ね一致する耳片部分より後方の
吸収体の長さが、前方に比べて大きくなる。即ち、第６
図に示される従来の吸収性物品では、吸収性物品１の縦
方向を二等分する中心線が、耳片２の縦方向を二等分す
る中心線イ−イ′と実質的に一致するのに対して、第１
図に示される本発明に係る吸収性物品では、吸収性物品
１の縦方向を二等分する中心線ロ−ロ′と耳片２の縦方
向を二等分する中心線ハ−ハ′とが実質的に一致しな
い。従って、装着時に臀部を覆う面積が恥骨部に比べて
相対的に増大し、第６図に示される従来の吸収性物品に
比べて吸収体の長さが等しいか又はやや小さい場合で
も、臀部からの漏れは飛躍的に抑制される。本発明にお
いては、吸収性物品の縦方向を二等分する中心線ロ−
ロ′と耳片の縦方向を二等分する中心線ハ−ハ′とは少
なくとも10mm以上遊離していることが好ましい。The absorbent article of the present invention is different from the conventional absorbent article shown in FIG. 6 in that the flexible ear piece 2 extends from the widthwise side end at a position deviated in the longitudinal direction of the absorbent article 1. Because
The length of the absorber behind the ear piece portion, which substantially coincides with the point where the liquid is excreted, is larger than that of the front. That is, the sixth
In the conventional absorbent article shown in the figure, the center line bisecting the longitudinal direction of the absorbent article 1 substantially coincides with the center line II ′ bisecting the longitudinal direction of the ear piece 2. Whereas the first
In the absorbent article according to the present invention shown in the figure, a center line Roll 'which bisects the longitudinal direction of the absorbent article 1 and a center line Ha' which bisects the longitudinal direction of the ear piece 2 are shown. Do not substantially match. Therefore, the area covering the buttocks at the time of wearing is relatively larger than that of the pubic bone, and even when the length of the absorber is equal to or slightly smaller than that of the conventional absorbent article shown in FIG. Leakage is drastically suppressed. In the present invention, the center line low bisects the longitudinal direction of the absorbent article.
It is preferable that at least 10 mm or more be separated from b 'and the center line ha' which bisects the longitudinal direction of the ear piece.
更に、本発明の吸収性物品は、第２図に示されるよう
に、吸収体６の使用者の肌に対向すべき面及び使用者の
衣類に対向すべき面が表面材4,5により被覆され、使用
者の肌に対向すべき面に位置する部分の表面材４は液体
透過性を有するが、使用者の衣類に対向すべき面に位置
する部分の表面材５は液体透過性を実質的に有しないも
のである。このような構成により、使用時に耳片２及び
表面材の液不透過性部分５が、排出された液体を二重に
遮蔽し、防漏性が極めて良好となる。Further, as shown in FIG. 2, the absorbent article of the present invention covers the surface of the absorbent body 6 which should face the user's skin and the surface which should face the user's clothing with the surface materials 4 and 5. The surface material 4 on the surface facing the user's skin has liquid permeability, but the surface material 5 on the surface facing the user's clothing has liquid permeability substantially. It does not have any. With such a configuration, the ear piece 2 and the liquid-impermeable portion 5 of the surface material at the time of use double-block the discharged liquid, and the leakproofness is extremely good.
本発明において表面材としては、紙、不織布、フィル
ム、ネット、それらの積層体など任意のものを用いるこ
とができるが、表面のべたつき感を考慮するとフィルム
やネット又はそれらと不織布との積層体が好ましい。フ
ィルムやネットを用いる場合、第３図のように使用者の
肌に対向すべき面及び使用者の衣類に対向すべき面の両
方に開孔を存在させて液体透過性にするより、第２図の
ように衣類に対向する面には開孔を存在させないで、液
体透過性を実質的に有しないようにすると、防漏性が向
上し非常に好ましい。In the present invention, as the surface material, paper, non-woven fabric, film, net, any of such as a laminate thereof can be used, but in consideration of the stickiness of the surface, a film or net or a laminate of these and a non-woven fabric is used. preferable. In the case of using a film or a net, as shown in FIG. 3, an aperture is present on both the surface to face the user's skin and the surface to face the user's clothing to make the second liquid permeable. As shown in the figure, it is highly preferable that the opening facing the clothing is not provided with an opening, and the liquid permeability is substantially not provided, because the leakproofness is improved.
本発明において耳片２としては、第５図に示すように
衣類７に固定する際に、容易に折れ曲がるほど可撓性で
あれば、任意のものを用いることができるが、防漏性を
考慮すると、液体不透過性であることが好ましい。第４
図に示すように、耳片２が防漏材３、表面材４及び吸収
体６から構成されるより、第２図のように、防漏材３を
吸収性物品の幅方向両側端から延出させることにより耳
片２を形成する方が構成が簡略となるので好ましい。In the present invention, as shown in FIG. 5, any piece can be used as the ear piece 2 if it is flexible enough to be easily bent when it is fixed to the garment 7 as shown in FIG. Then, it is preferably liquid-impermeable. 4th
As shown in the figure, the ear piece 2 is composed of the leak-proof material 3, the surface material 4, and the absorber 6, so that the leak-proof material 3 extends from both widthwise ends of the absorbent article as shown in FIG. It is preferable to form the ear piece 2 by letting it out, since the configuration is simplified.
本発明に係わる耳片２の好ましい大きさは、吸収性物
品の大きさにより変化するので一概に規定されるもので
はない。ただし、吸収体の長さと幅が各々250mm、70mm
程度の夜用大型ナプキンにおいては、一般に耳片の長さ
と幅は各々30〜70mm、25〜50mmであることが、衣類への
固定の安定性及び固定操作の容易性の点で好ましい。ま
た、耳片の位置は、吸収性物品の縦方向中央から20〜40
mm程度縦端に偏倚させることが好ましい。The preferred size of the ear piece 2 according to the present invention is not necessarily defined because it varies depending on the size of the absorbent article. However, the length and width of the absorber are 250 mm and 70 mm, respectively.
In general, a large napkin for night use preferably has a length and width of 30 to 70 mm and 25 to 50 mm, respectively, in terms of stability of fixing to clothing and easiness of fixing operation. In addition, the position of the ear piece is 20 to 40 from the longitudinal center of the absorbent article.
It is preferable to be deviated to the vertical end by about mm.
本発明において、吸収体としては、パルプ、レーヨ
ン、合成繊維などの集合体や、高分子吸収剤、発泡体な
どの公知のものを用いることができるが、使用者の肌に
対向すべき面には、レーヨンなどの親水性繊維とポリエ
ステルなどの合成繊維の混合体を載置すると、べとつき
感が低減するので好ましい。In the present invention, as the absorber, pulp, rayon, aggregates such as synthetic fibers, and polymer absorbents, known materials such as foams can be used, but on the surface that should face the user's skin It is preferable to place a mixture of hydrophilic fibers such as rayon and synthetic fibers such as polyester since the sticky feeling is reduced.
本発明において防漏材としては、液体不透過性であれ
ば何を用いてもよく、フィルム、不織布、撥水紙、それ
らの積層体などが挙げられる。風合いを考慮すると、フ
ィルムと不織布の積層体が好ましく、第２図のように、
フィルムと不織布の積層体を、人体に対向する面に不織
布が位置する様に構成することがより好ましい。In the present invention, any leakproof material may be used as long as it is impermeable to liquid, and examples thereof include a film, a nonwoven fabric, a water-repellent paper, and a laminate thereof. In consideration of the texture, a laminate of a film and a nonwoven fabric is preferable, and as shown in FIG.
It is more preferable that the laminate of the film and the nonwoven fabric is configured such that the nonwoven fabric is located on the surface facing the human body.
尚、衣類への固定をより強固にするため、耳片乃至は
吸収性物品本体に、粘着剤や防滑剤を設けることが好ま
しい。It is preferable to provide an adhesive or an anti-slip agent on the ear piece or the absorbent article main body in order to further firmly fix the garment to the clothing.
本発明の吸収性物品は詳述した例に限定されることな
く、上記に規定した範囲において種々の改変をなし得る
ものである。The absorbent article of the present invention is not limited to the examples described in detail, but can be variously modified within the range specified above.
以下、本発明が如何に有用であるかを具体的に例を挙
げて説明するが、本発明がこれらの実施例に限定される
ことはない。Hereinafter, how the present invention is useful will be specifically described with reference to examples, but the present invention is not limited to these examples.
実施例１及び比較例１〜３ 下記に示す表面材、吸収体及び防漏材を用い、第２図
に示す本発明に係わる生理用ナプキン、第3,4図に示す
比較の生理用ナプキン、及び第７図に示す従来の生理用
ナプキンを作成した。尚、耳片の寸法は長さ50mm、巾35
mmとし、本発明に係る生理用ナプキンについては第１図
のロ−ロ′線とハ−ハ′線との間隔を30mmとした。Example 1 and Comparative Examples 1 to 3 Using the surface material, absorber and leakproof material shown below, a sanitary napkin according to the present invention shown in FIG. 2, a comparative sanitary napkin shown in FIGS. And a conventional sanitary napkin shown in FIG. In addition, the size of the ear piece is 50 mm in length and 35 in width
mm, and the distance between the roll 'line and the ha' line in FIG. 1 was 30 mm for the sanitary napkin according to the present invention.
表面材：ポリオレフィン系繊維主体の熱接着不織布にポ
リエチレンフィルムをラミネート法で一体化した後、エ
ンボス穿孔加工を処し、開孔を形成せしめたものを、肌
に対向すべき面にフィルムが位置するように設けた。Surface material: After laminating a polyethylene film to a heat-bonded nonwoven fabric mainly composed of polyolefin fibers, laminating the polyethylene film and embossing to form an opening so that the film is positioned on the surface that should face the skin Provided.
吸収体：吸収紙、線状パルプ，高分子吸収体を順次積層
して成る長さ250mm、巾70mmのシートを用いた。Absorber: A sheet having a length of 250 mm and a width of 70 mm formed by sequentially laminating absorbent paper, linear pulp, and a polymer absorbent was used.
防漏材：ポリエステル系繊維から成る熱接着不織布にポ
リエチレン系フィルムをラミネート法で一体化したもの
を、フィルムが衣類に対向するように設けた。Leak-proof material: A heat-bonded nonwoven fabric made of polyester-based fiber and a polyethylene-based film integrated by a laminating method were provided so that the film faced clothing.
得られた生理用ナプキンについて、人体モデルを用い
て、直立時における股間部からの漏れ及び臥褥時におけ
る臀部からの漏れが各々認められるまでに吸収された試
験液の量を測定した。With respect to the obtained sanitary napkin, the amount of the test solution absorbed until the leakage from the crotch portion when standing upright and the leakage from the buttocks when lying down was observed using a human body model.
結果を第１表に示す。これらの値が大きいほど、各々
股間部及び臀部における防漏性が高いことを意味する。The results are shown in Table 1. The larger these values are, the higher the leakproofness in the crotch and buttocks is.
〔発明の効果〕 実施例１及び比較例１〜３からわかるように、本発明
の吸収性物品は比較の吸収性物品に比べて、臀部からの
漏れが効果的に低減し、また、股間部からの漏れも大幅
に低減しており、まさに理想的な吸収性物品であると言
える。 [Effects of the Invention] As can be seen from Example 1 and Comparative Examples 1 to 3, the absorbent article of the present invention effectively reduces leakage from the buttocks as compared with the comparative absorbent article, and also has a crotch part. The leakage from the material has been greatly reduced, and it can be said that this is an ideal absorbent article.
第１図は本発明に係わる吸収性物品の一実施例の正面
図、第２図は第１図のハ−ハ′線における断面図、第３
図及び第４図はそれぞれ比較の吸収性物品の第２図に相
当する断面図、第５図は本発明の吸収性物品の衣類への
固定法を示す図、第６図は従来の吸収性物品の正面図、
第７図は第６図のイ−イ′線における断面図、第８図は
その衣類への固定法を示す図である。 1:吸収性物品 2:耳片 3:防漏材 4:表面材の液体透過性部分 5:表面材の液体不透過性部分 6:吸収体 7:衣類FIG. 1 is a front view of one embodiment of an absorbent article according to the present invention, FIG. 2 is a cross-sectional view taken along line H--A 'of FIG.
FIG. 4 and FIG. 4 are sectional views corresponding to FIG. 2 of a comparative absorbent article, respectively, FIG. 5 is a view showing a method of fixing the absorbent article of the present invention to clothing, and FIG. 6 is a conventional absorbent article. Front view of the article,
FIG. 7 is a sectional view taken along the line II 'of FIG. 6, and FIG. 8 is a view showing a method of fixing the same to clothing. 1: Absorbent article 2: Ear piece 3: Leak-proof material 4: Liquid-permeable part of surface material 5: Liquid-impermeable part of surface material 6: Absorber 7: Clothing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 隆俊 栃木県宇都宮市今泉3009―１ (56)参考文献 実開 昭60−158828（ＪＰ，Ｕ) 実開 昭56−71228（ＪＰ，Ｕ) 実開 昭62−189725（ＪＰ，Ｕ) 実開 昭62−36712（ＪＰ，Ｕ) 実開 昭62−12322（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takatoshi Kobayashi 3009-1 Imaizumi, Utsunomiya City, Tochigi Prefecture (56) References Japanese Utility Model Application Sho 60-158828 (JP, U) Japanese Utility Model Utility Model Apparatus 56-71228 (JP, U) 1987-189725 (JP, U) 1987-36712 (JP, U) 1987-12322 (JP, U)
Claims (1)
体、及び液体不透過性の防漏材を順次積層して成る実質
的に縦長の吸収性物品において、吸収体の使用者の肌に
対向すべき面及び使用者の衣類に対向すべき面が表面材
により被覆され、使用者の肌に対向すべき面に位置する
部分の表面材は液体透過性を有するが、使用者の衣類に
対向すべき面に位置する部分の表面材は液体透過性を実
質的に有さず、また該吸収性物品の縦方向に偏倚した位
置で幅方向両側端から、防漏材を吸収性物品の幅方向両
側端から延出させることにより形成された可撓性の耳片
が延出しており、吸収性物品の縦方向を二等分する中心
線と耳片の縦方向を二等分する中心線とは少なくとも10
mm以上遊離しており、さらに耳片乃至は吸収性物品本体
に、粘着剤を設けられていることを特徴とする吸収性物
品。1. A substantially vertically absorbent article comprising a liquid-permeable surface material, a liquid-retentive absorber, and a liquid-impermeable leakproof material laminated in this order. The surface to be opposed to the skin and the surface to be opposed to the clothing of the user are covered with the surface material, and the surface material of the portion located on the surface to be opposed to the skin of the user has liquid permeability, The surface material of the portion located on the surface to be opposed to the clothes has substantially no liquid permeability, and absorbs the leak-proof material from both ends in the width direction at a position shifted in the longitudinal direction of the absorbent article. A flexible ear piece formed by extending from both ends in the width direction of the article extends, and a center line that bisects the longitudinal direction of the absorbent article and the longitudinal direction of the ear piece are bisected. At least 10
An absorbent article characterized by being free by at least mm and further provided with an adhesive on a lug or the absorbent article main body.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013486A JP2971887B2 (en) | 1989-01-23 | 1989-01-23 | Absorbent articles |
| MYPI89001626A MY104483A (en) | 1988-11-28 | 1989-11-23 | Sanitary article |
| GB9222141A GB2260708B (en) | 1988-11-28 | 1989-11-28 | Method of absorbing menstrual flow using a sanitary article |
| GB8926841A GB2227174B (en) | 1988-11-28 | 1989-11-28 | Sanitary article |
| SG49994A SG49994G (en) | 1988-11-28 | 1994-04-13 | Method of absorbing menstrual flow using a sanitary article |
| SG50594A SG50594G (en) | 1988-11-28 | 1994-04-13 | Sanitary article |
| HK60294A HK60294A (en) | 1988-11-28 | 1994-06-23 | Sanitary article |
| HK88694A HK88694A (en) | 1988-11-28 | 1994-08-25 | Method of absorbing menstrual flow using a sanitary article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013486A JP2971887B2 (en) | 1989-01-23 | 1989-01-23 | Absorbent articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02193664A JPH02193664A (en) | 1990-07-31 |
| JP2971887B2 true JP2971887B2 (en) | 1999-11-08 |
Family
ID=11834448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1013486A Expired - Fee Related JP2971887B2 (en) | 1988-11-28 | 1989-01-23 | Absorbent articles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2971887B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2586442Y2 (en) * | 1992-02-28 | 1998-12-09 | 大王製紙株式会社 | Sanitary napkin |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62101525U (en) * | 1985-09-04 | 1987-06-27 | ||
| JPH0323233Y2 (en) * | 1985-10-09 | 1991-05-21 | ||
| US4701178A (en) * | 1986-12-01 | 1987-10-20 | Personal Products, Inc. | Sanitary napkins with flaps |
| JPS63180031U (en) * | 1987-05-12 | 1988-11-21 |
-
1989
- 1989-01-23 JP JP1013486A patent/JP2971887B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02193664A (en) | 1990-07-31 |
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