JP4112109B2 - Sterilized back paper - Google Patents
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- JP4112109B2 JP4112109B2 JP05414199A JP5414199A JP4112109B2 JP 4112109 B2 JP4112109 B2 JP 4112109B2 JP 05414199 A JP05414199 A JP 05414199A JP 5414199 A JP5414199 A JP 5414199A JP 4112109 B2 JP4112109 B2 JP 4112109B2
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- paper
- sterilized
- thermoplastic resin
- back paper
- inorganic filler
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- Apparatus For Disinfection Or Sterilisation (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、医療器具等の滅菌に使用される滅菌バック紙（Ａ）に関し，特に，滅菌バック紙（Ａ）とフィルム（Ｂ）を組み合わせたコンビネーションタイプの滅菌用包装材（Ｃ）に最適な滅菌バック紙（Ａ）に関するものである（図１）。
【０００２】
【従来の技術】
注射器，手術用手袋等の医療器具を滅菌バック紙（Ａ）とフィルム（Ｂ）の周縁部同士をヒートシールした滅菌用包装材（Ｃ）に封入し，その後，エチレンオキサイドガス等を用いたガス滅菌やγ線等を用いた放射線滅菌を施して，収容物を滅菌処理するものである。フィルム（Ｂ）はポリエチレンテレフタレートとポリプロピレンあるいはポリエチレンの複合フィルムが一般的であり，ポリプロピレンあるいはポリエチレン側と滅菌バック紙（Ａ）がヒートシールされる。滅菌用バック紙（Ａ）としての必要な特性としては（１）１０〜５００秒／１００ｃｃ程度の透気度を有し、菌の侵入を防ぎ，更にガス通気性があること，（２）ピンホールがないこと，（３）滅菌後に医療器材等を取り出すときに必要な特性であるピール性（開封時に紙繊維の脱落無く，きれいに剥がれること）が良いこと，（４）ヒートシール性があること等がある。
【０００３】
そして，従来，使用されてきた滅菌バック紙は必ずしも前記要求特性を満足していない。即ち，（１）セルロース繊維単独で使用した滅菌バック紙はフィルムとのコンビネーションタイプに用いた滅菌包装材の場合，ピンホールはないが，ピール性，ヒートシール性が悪いという問題がある。そこで，（２）熱可塑性樹脂の繊維状又は粉末をセルロース繊維に配合した滅菌バック紙や（３）特許１５５４２６３号や特許１５８５５６６号の熱可塑性樹脂層を紙表面に設ける滅菌バック紙あるいは（４）熱可塑性樹脂で含浸処理を施した滅菌バック紙が使用されている。しかしながら，（２）熱可塑性樹脂繊維混抄紙はヒートシール性が良好であるが，フィルムとの接着でスポット的に強く接着する部分が出来るのでピール性が非常に悪く，また，（３）紙表面に熱可塑性樹脂層を設けた紙あるいは（４）熱可塑性樹脂を含浸した紙はピール性，ヒートシール性と通気性の両立が困難である。この他にも，樹脂含浸紙に熱可塑性樹脂の塗工層を設けた滅菌バック紙（５）はピール性，ヒートシール性が極めて優れているが，通気性が悪いという問題点を有するため，滅菌バック紙のすべての要求特性を満足するものはほとんど無かった。
【０００４】
【発明が解決しようとする課題】
本発明は，このような従来の問題点を解決することにあり，特に通気性が良く，優れたピール性，ヒートシール性を有する諸実用特性全てにバランスの取れる滅菌バック紙を提供する。
【0005】
【課題を解決するための手段】
従来の滅菌バック紙はすでに述べたような欠点があるが，良好な通気性を有する塗工層を設ければ，前記の特性を維持しながら，従来の問題を全て解決する事になる。本発明は以上の知見に基づき完成したものであり，フィルム（Ｂ）とヒートシールする基紙（Ｄ）の表面に無機系填料を含有する熱可塑性樹脂層（Ｅ）を塗布した滅菌バック紙（Ａ）であって（図２）、前記熱可塑性樹脂がエチレン−酢酸ビニル系共重合体であり、前記無機系填料が乾燥後の熱可塑性樹脂１００重量部に対して５０重量部以上含有されており、前記脂層の塗布量が１〜２０g/m2であることを特徴とする滅菌バック紙である。
【０００６】
本発明に使用する基紙（Ｄ）の材料としては，主として晒木材パルプであるが，他の天然繊維，合成繊維などを使用しても支障がない。この場合，基紙に要求される特性としては，良好な通気性，加工時や使用時に伸びたり破断しない程度の強度，耐水性を付与する事などが要求される。なお，前記基紙に樹脂含浸処理を施した紙でも支障がない。特に，基材としては未塗工滅菌バック紙，上質紙，ラテックス含浸紙などが好ましい。
【０００７】
本発明の無機系填料は粒子径が１５．０〜０．１μｍのものを用いる。無機系填料の種類としては，白土，タルク，カオリン，炭酸カルシウム，二酸化チタン，水酸化アルミなどが挙げられるが，これらに限定されるものではなく，前記の無機系填料は単独でもよいし，数種類を混合しても支障はない。特に粒子径が５．０〜０．１μｍのものが，良好な通気性，ピール性が得られるので最適である。
【０００８】
無機系填料のバインダーとして加える熱可塑性樹脂は，ヒートシール性が良好で，填料混和性の良好な樹脂である，エチレン−酢酸ビニル系共重合体を用いる。無機系填料と熱可塑性樹脂の配合は，乾燥後の熱可塑性樹脂１００重量部に対して５０重量部以上含有されている必要がある。無機系填料が５０重量部以下になると透気度が増大して通気性が悪くなる。また，填料の分散性を良くするために分散剤を塗布液に添加しても支障はない。
【０００９】
樹脂の塗工量は透気度に影響するので重要である。従って，本発明の無機系填料を含有する熱可塑性樹脂の塗工量は１〜２０g/m2が必要である。塗工量が１g/m2より少ないとヒートシール性が悪く。一方，塗工量が２０g/m2より多いと，透気度が増大し，通気性が悪くなる。
【００１０】
本発明の塗工方法としては，抄紙機に備えているオンマシン塗工もしくは抄紙後のオフマシン塗工が可能である。塗工方式は特に限定されるものではなく，例えばエアナイフコータ，ロッドバーコータ，ブレードコータなどコータ及びその他の塗工方式が利用できる。
【００１１】
本発明による滅菌バック紙の用途は紙とフィルムを組み合わせたタイプの滅菌用包装材に最適であるが，紙と成形したプラスチック容器を組み合わせたタイプや紙単独の滅菌用包装材に用いてもなんら支障はない。
【００１２】
【実施例】
以下に，本発明の実施例を挙げる。なお，実施例における滅菌バック紙の実用特性は以下の方法で行った。
（１） ヒートシール性：滅菌バック紙の塗工面とフィルムのポリプロピレン面をインパルス式ヒートシーラーにより１秒間（１８０℃）ヒートシールして，テンシロン引張試験機により１８０度剥離強度を測定した。
（２） ピール性：ヒートシール強度測定後の紙剥けの状況を目視により判定した。
〇：紙剥けしない ×：紙剥けする。
（３） 透気度：ＪＩＳ−Ｐ８１１７にしたがって透気度を測定した。
【００１３】
実施例１
Ｎ材５０％，Ｌ材５０％のパルプ配合でサイズ剤，紙力増強剤，湿潤紙力剤を添加して抄紙された基紙（未塗工滅菌バック紙）に，二酸化チタンとエチレンー酢酸ビニル系共重合体樹脂を乾燥後の熱可塑性樹脂１００重量部に対して二酸化チタン１００重量部になるように混合した塗布液を乾燥塗工量が７g/m2になるように塗工乾燥し，基材の表面に無機系填料を含んだ熱可塑性樹脂層を設けた本発明の滅菌バック紙を作成した。
【００１４】
実施例２
実施例１で使用した基紙に，カオリンとエチレンー酢酸ビニル系共重合体樹脂を乾燥後の熱可塑性樹脂１００重量部に対してカオリン５０重量部になるように混合した塗布液を乾燥塗工量が１５g/m2になるように塗工乾燥し，基材の表面に無機系填料を含んだ熱可塑性樹脂層を設けた本発明の滅菌バック紙を作成した。
【００１５】
実施例３
実施例１で使用した基紙に，オンマシン含浸機にてアクリル樹脂の含浸量が１０g/m2になるように含浸乾燥し，実施例１と同様の塗布液，塗工量で塗工し，本発明の滅菌バック紙を作成した。
【００１６】
比較例１
実施例１で使用した基紙に，実施例１に比較用として樹脂層のない滅菌バック紙を作成した。
【００１７】
比較例２
実施例１で使用した基紙に，エチレンー酢酸ビニル系共重合体の塗布液を実施例１と同様の塗工方法，塗工量で塗工し，無機系填料を含まない樹脂層を設けた滅菌バック紙を作成した。
【００１８】
比較例３
実施例３で使用した含浸基紙に，エチレンー酢酸ビニル系共重合体の塗布液を実施例１と同様の塗工方法，塗工量で塗工し，無機系填料を含まない樹脂層を設けた滅菌バック紙を作成した。
【００１９】
比較例４
実施例１で使用した基紙，塗布液で，乾燥後の塗工量が２５g/m2になるように塗工した滅菌バック紙を作成した。
【００２０】
前記実施例，比較例により得られた各滅菌バック紙の実用特性を表１に示す。
【００２１】
【表１】
【発明の効果】
以上詳述したように，この発明によれば従来技術より通気性が良好であり，優れたピール性，ヒートシール性を有する滅菌バック紙が得られ，諸実用特性全てにバランスの取れるという優れた効果が認められた。
【図面の簡単な説明】
【図１】：従来の滅菌バック紙の断面図である。
【図２】：本発明の滅菌バック紙の一実施態様の断面図である。
【符号の説明】
Ａ：滅菌バック紙
Ｂ：フィルム
Ｃ：滅菌用包装材
Ｄ：基紙
Ｅ：無機系填料含有熱可塑性樹脂層[0001]
[Industrial application fields]
The present invention relates to a sterilized back paper (A) used for sterilization of medical instruments and the like, and particularly suitable for a combination type sterilization packaging material (C) combining a sterilized back paper (A) and a film (B). This relates to the sterilized back paper (A) (FIG. 1).
[0002]
[Prior art]
A medical instrument such as a syringe or surgical glove is sealed in a sterilization packaging material (C) in which the peripheral edges of the sterilized back paper (A) and film (B) are heat-sealed, and then a gas using ethylene oxide gas or the like. The contents are sterilized by sterilization or radiation sterilization using gamma rays. The film (B) is generally a composite film of polyethylene terephthalate and polypropylene or polyethylene, and the polypropylene or polyethylene side and the sterilized back paper (A) are heat-sealed. Necessary characteristics as sterilization back paper (A) are (1) Air permeability of about 10 to 500 seconds / 100cc, preventing invasion of bacteria, and gas permeability, (2) Pin No holes, (3) Peeling properties that are necessary when taking out medical devices after sterilization (paper fibers will not peel off when opened), (4) Heat sealability Etc.
[0003]
Conventionally used sterilized back paper does not always satisfy the required characteristics. That is, (1) The sterilized back paper used alone with cellulose fiber is not a pinhole in the case of a sterilized packaging material used in combination with a film, but has a problem that the peelability and heat sealability are poor. Therefore, (2) a sterilized back paper in which a fibrous form or a powder of a thermoplastic resin is mixed with cellulose fibers, or (3) a sterilized back paper provided with a thermoplastic resin layer of Japanese Patent No. 1554263 or Japanese Patent No. 1585566, or (4) A sterilized back paper impregnated with a thermoplastic resin is used. However, although (2) thermoplastic resin fiber mixed paper has good heat-sealability, it has a very poor peelability due to the strong spot-like adhesion due to adhesion to the film, and (3) the paper surface. Paper having a thermoplastic resin layer or (4) paper impregnated with a thermoplastic resin is difficult to achieve both peelability, heat sealability and air permeability. In addition to this, the sterilized back paper (5) provided with a resin-impregnated paper and a thermoplastic resin coating layer has excellent peelability and heat sealability, but has a problem of poor air permeability. Few were satisfied with all the required properties of sterilized backing paper.
[0004]
[Problems to be solved by the invention]
The present invention is to solve such a conventional problem, and provides a sterilized back paper which is particularly well-ventilated and can be balanced with all the practical properties having excellent peelability and heat sealability.
[0005]
[Means for Solving the Problems]
The conventional sterilized back paper has the drawbacks described above. However, if a coating layer having good air permeability is provided, all of the conventional problems are solved while maintaining the above-mentioned characteristics. The present invention has been completed based on the above knowledge, and is a sterilized back paper (E) coated with a thermoplastic resin layer (E) containing an inorganic filler on the surface of a base paper (D) to be heat sealed with a film (B) ( A) (FIG. 2), wherein the thermoplastic resin is an ethylene-vinyl acetate copolymer, and the inorganic filler is contained in an amount of 50 parts by weight or more based on 100 parts by weight of the dried thermoplastic resin. The sterilized back paper is characterized in that the coating amount of the fat layer is 1 to 20 g / m2.
[0006]
The material of the base paper (D) used in the present invention is mainly bleached wood pulp, but there is no problem even if other natural fibers or synthetic fibers are used. In this case, the properties required for the base paper include good air permeability, strength that does not stretch or break during processing and use, and water resistance. Note that there is no problem even if the base paper is subjected to resin impregnation treatment. In particular, as the substrate, uncoated sterilized back paper, high-quality paper, latex-impregnated paper, and the like are preferable.
[0007]
The inorganic filler of the present invention has a particle size of 15.0 to 0.1 μm. Examples of inorganic fillers include clay, talc, kaolin, calcium carbonate, titanium dioxide, and aluminum hydroxide. However, the inorganic filler is not limited to these, and the inorganic filler may be used alone or in several types. There is no problem even if they are mixed. In particular, particles having a particle size of 5.0 to 0.1 μm are optimal because good air permeability and peelability can be obtained.
[0008]
As the thermoplastic resin added as a binder for the inorganic filler, an ethylene-vinyl acetate copolymer, which is a resin having good heat sealability and good filler miscibility, is used. The blend of the inorganic filler and the thermoplastic resin needs to be contained by 50 parts by weight or more with respect to 100 parts by weight of the thermoplastic resin after drying. When the inorganic filler is 50 parts by weight or less, the air permeability increases and the air permeability deteriorates. Moreover, there is no problem even if a dispersant is added to the coating solution in order to improve the dispersibility of the filler.
[0009]
The amount of resin applied is important because it affects the air permeability. Therefore, the coating amount of the thermoplastic resin containing the inorganic filler of the present invention needs to be 1 to 20 g / m2. If the coating amount is less than 1 g / m 2 , the heat sealability is poor. On the other hand, when the coating amount is more than 20 g / m 2 , the air permeability increases and the air permeability deteriorates.
[0010]
As the coating method of the present invention, on-machine coating provided in a paper machine or off-machine coating after paper making is possible. The coating method is not particularly limited, and for example, a coater such as an air knife coater, a rod bar coater, or a blade coater and other coating methods can be used.
[0011]
The use of the sterilized backing paper according to the present invention is most suitable for sterilization packaging materials that combine paper and film, but it can be used for sterilization packaging materials that combine paper and molded plastic containers or paper alone. There is no hindrance.
[0012]
【Example】
Examples of the present invention will be given below. The practical characteristics of the sterilized back paper in the examples were as follows.
(1) Heat sealability: The coated surface of the sterilized back paper and the polypropylene surface of the film were heat sealed with an impulse heat sealer for 1 second (180 ° C.), and the 180 ° peel strength was measured with a Tensilon tensile tester.
(2) Peel property: The state of paper peeling after the heat seal strength measurement was determined visually.
◯: Paper is not peeled ×: Paper is peeled off
(3) Air permeability: The air permeability was measured according to JIS-P8117.
[0013]
Example 1
Titanium dioxide and ethylene-vinyl acetate are added to the base paper (uncoated sterilized backing paper) made by adding sizing agent, paper strength enhancer and wet paper strength agent with 50% N material and 50% L material. A coating solution prepared by mixing the copolymer resin with 100 parts by weight of the dried thermoplastic resin so as to be 100 parts by weight of titanium dioxide is coated and dried so that the dry coating amount is 7 g / m 2 . A sterilized back paper of the present invention was prepared in which a thermoplastic resin layer containing an inorganic filler was provided on the surface of a substrate.
[0014]
Example 2
A coating amount obtained by mixing the base paper used in Example 1 with kaolin and an ethylene-vinyl acetate copolymer resin so as to be 50 parts by weight of kaolin with respect to 100 parts by weight of the dried thermoplastic resin There were coated dried so that 15 g / m 2, were prepared sterile back sheet of the present invention having a thermoplastic resin layer containing an inorganic filler to the surface of the substrate.
[0015]
Example 3
The base paper used in Example 1 was impregnated and dried so that the impregnation amount of acrylic resin was 10 g / m 2 using an on-machine impregnation machine, and coated with the same coating liquid and coating amount as in Example 1. The sterilized back paper of the present invention was prepared.
[0016]
Comparative Example 1
For the base paper used in Example 1, a sterilized back paper without a resin layer was prepared as a comparative example in Example 1.
[0017]
Comparative Example 2
The base paper used in Example 1 was coated with a coating solution of an ethylene-vinyl acetate copolymer in the same coating method and coating amount as in Example 1 to provide a resin layer containing no inorganic filler. A sterilized backing paper was made.
[0018]
Comparative Example 3
The impregnated base paper used in Example 3 was coated with an ethylene-vinyl acetate copolymer coating solution in the same coating method and coating amount as in Example 1 to provide a resin layer containing no inorganic filler. A sterile back paper was made.
[0019]
Comparative Example 4
A sterilized back paper coated with the base paper and coating solution used in Example 1 so that the coating amount after drying was 25 g / m 2 was prepared.
[0020]
Table 1 shows the practical characteristics of each sterilized back paper obtained in the above Examples and Comparative Examples.
[0021]
[Table 1]
【The invention's effect】
As described above in detail, according to the present invention, the air permeability is better than that of the prior art, and a sterilized back paper having excellent peel and heat sealing properties can be obtained, which is excellent in that all practical properties can be balanced. The effect was recognized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a conventional sterilized back paper.
FIG. 2 is a cross-sectional view of one embodiment of the sterilized backing paper of the present invention.
[Explanation of symbols]
A: Sterilized backing paper B: Film C: Sterilization packaging material D: Base paper E: Thermoplastic resin layer containing inorganic filler
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05414199A JP4112109B2 (en) | 1999-03-02 | 1999-03-02 | Sterilized back paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05414199A JP4112109B2 (en) | 1999-03-02 | 1999-03-02 | Sterilized back paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000246840A JP2000246840A (en) | 2000-09-12 |
| JP4112109B2 true JP4112109B2 (en) | 2008-07-02 |
Family
ID=12962295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05414199A Expired - Lifetime JP4112109B2 (en) | 1999-03-02 | 1999-03-02 | Sterilized back paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4112109B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018222147A1 (en) * | 2017-05-31 | 2018-12-06 | Scg Packaging Public Compagny Limited | Coating composition and substrate coated with said coating composition |
-
1999
- 1999-03-02 JP JP05414199A patent/JP4112109B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000246840A (en) | 2000-09-12 |
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