JPS6389391A - Gum solution for planographic printing plate - Google Patents
Gum solution for planographic printing plateInfo
- Publication number
- JPS6389391A JPS6389391A JP23539886A JP23539886A JPS6389391A JP S6389391 A JPS6389391 A JP S6389391A JP 23539886 A JP23539886 A JP 23539886A JP 23539886 A JP23539886 A JP 23539886A JP S6389391 A JPS6389391 A JP S6389391A
- Authority
- JP
- Japan
- Prior art keywords
- hydroxyethyl cellulose
- printing plate
- phosphoric acid
- sulfite
- phosphate
- 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims abstract description 23
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 23
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 23
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 16
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 11
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 10
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229940079826 hydrogen sulfite Drugs 0.000 claims abstract description 9
- 239000010452 phosphate Substances 0.000 claims abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 18
- 239000011241 protective layer Substances 0.000 abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- 230000002411 adverse Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 5
- 230000001603 reducing effect Effects 0.000 abstract description 5
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 230000016615 flocculation Effects 0.000 abstract 1
- 238000005189 flocculation Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 16
- 229920001206 natural gum Polymers 0.000 description 12
- 235000021317 phosphate Nutrition 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 4
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- UAOMVDZJSHZZME-UHFFFAOYSA-N diisopropylamine Chemical compound CC(C)NC(C)C UAOMVDZJSHZZME-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000001488 sodium phosphate Substances 0.000 description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 2
- 244000215068 Acacia senegal Species 0.000 description 1
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920001615 Tragacanth Polymers 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000305 astragalus gummifer gum Substances 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- 229940043279 diisopropylamine Drugs 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JJWLVOIRVHMVIS-UHFFFAOYSA-N isopropylamine Chemical compound CC(C)N JJWLVOIRVHMVIS-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
Landscapes
- Printing Plates And Materials Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、製版された平版印刷版を保存するために、平
版印刷版の表面に塗布するガム液に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a gum solution that is applied to the surface of a planographic printing plate in order to preserve the plate-made planographic printing plate.
（ロ）従来の技術及び発明が解決しようとする問題点。(b) Problems to be solved by conventional techniques and inventions.
一般的に、現像処理等により製版された平版印刷版は、
直ちに印刷に供せられる。しかし、印刷機や現像処理等
の都合で、数時間〜数日の間、製版された平版印刷版を
保存しておかなければならないということがあった。保
存中に、平版印刷版の非画像部を形成している平版印刷
版の支持体表面（主にアルミニウム表面）が大気の影響
を受けて変質し、印刷インキを受理しやすくなるという
ことがあった。In general, lithographic printing plates made by development processing, etc.
Ready for printing immediately. However, due to circumstances such as printing machines and development processing, it is sometimes necessary to store the prepared lithographic printing plates for several hours to several days. During storage, the support surface (mainly aluminum surface) of the lithographic printing plate, which forms the non-image area of the lithographic printing plate, may change in quality due to the influence of the atmosphere, making it easier to accept printing ink. Ta.
このため、従来より平版印刷版の表面に保護層を設ける
ことが行われている。この保護層は、アラビアガ・ム、
トラガカントガム、グアーガム、メスキットガム、ガフ
チガム、サクラガム等の天然ガムを水に熔解させたガム
液（天然ガム液）を平版印刷版の表面に塗布することに
より形成されるものである。しかしながら、天然ガム液
はしばしば経時的に凝集を起こし、平版印刷版の表面に
均質な保護層を形成させ雌いということがあった。For this reason, it has been conventional practice to provide a protective layer on the surface of a lithographic printing plate. This protective layer is made up of
It is formed by coating the surface of a lithographic printing plate with a gum solution (natural gum solution) made by dissolving natural gums such as tragacanth gum, guar gum, meskit gum, gafti gum, and cherry gum in water. However, the natural gum liquid often causes aggregation over time, forming a homogeneous protective layer on the surface of the lithographic printing plate, which is a problem.
本発明者は天然ガム液が凝集を起こしやすい理由を検討
したところ、天然ガムの水に対する熔解性がＰ Ｈの影
響によって太き（変動するためであることを見いだした
。また、ＰＨの変化は天然ガム液に添加する種々の薬剤
や天然ガム液の温度変化によって惹起されることも見い
だした。そこで、本発明者はＰＨの変化が生じ難く、ま
た仮にＰＩ（の変化があっても溶解性の変動が生じ雌い
ガム液を開発すべく種々研究した結果、本発明に到達し
た。The present inventor investigated the reason why natural gum liquids tend to agglomerate and found that this is because the solubility of natural gum in water increases (varies) due to the influence of PH. It was also found that this phenomenon is caused by various chemicals added to natural gum liquid and temperature changes of natural gum liquid.Therefore, the present inventor found that changes in PH are difficult to occur, and even if there is a change in PI, the solubility is low. As a result of various studies aimed at developing a female gum liquid due to variations in the amount of gum, the present invention was achieved.
（ハ）問題点を解決するための手段及び作用即ち本発明
は、ヒドロキシエチルセルロースと、燐酸と、燐酸塩と
、亜硫酸塩又は亜硫酸水素塩と、脂肪族アミンとを含有
することを特徴とする平版印刷版用ガム液に関するもの
である。(c) Means and effects for solving the problems, that is, the present invention is a lithographic plate characterized by containing hydroxyethyl cellulose, phosphoric acid, a phosphate, a sulfite or a hydrogen sulfite, and an aliphatic amine. This invention relates to gum liquid for printing plates.
本発明に用いるヒドロキシエチルセルロースは、平版印
刷版の表面に形成される保護層の主体をなスモのである
。ヒドロキシエチルセルロースは、製膜性に優れている
ため保護層の主体として適当である。そして、ヒドロキ
シエチルセルロースは、水に対する熔解性がＰＨ等の影
響により変動しにくいため、凝集の生じ難いガム液を得
ることができる。The hydroxyethyl cellulose used in the present invention is the main component of the protective layer formed on the surface of the lithographic printing plate. Hydroxyethylcellulose has excellent film-forming properties and is therefore suitable as the main component of the protective layer. Furthermore, since the solubility of hydroxyethylcellulose in water is less likely to change due to the influence of pH, etc., it is possible to obtain a gum solution that is less likely to cause agglomeration.
本発明に用いる燐酸及び燐酸塩は、平版印刷版の非画像
部を形成しているアルミニウム表面に作用して、印刷イ
ンキが非画像部に受理されにくいようにするためのもの
である。更に両者の緩衝作用により、ガム液のＰＨの変
化を最小限に抑制するも°のである。The phosphoric acid and phosphate salt used in the present invention act on the aluminum surface forming the non-image area of the lithographic printing plate to make it difficult for printing ink to be received in the non-image area. Furthermore, due to the buffering effects of both, changes in the pH of the gum solution can be suppressed to a minimum.
本発明に用いる亜硫酸塩又は亜硫酸水素塩と脂肪族アミ
ンは、還元作用を発揮し、保護層の主体であるヒドロキ
シエチルセルロース膜を通して大気が平版印刷版の画像
部及び非画像部（アルミニウム表面）に悪影響を与える
ことを防止するものである。脂肪族アミンとしては、プ
ロピルアミン。The sulfite or hydrogen sulfite and aliphatic amine used in the present invention exhibit a reducing effect, and the atmosphere adversely affects the image area and non-image area (aluminum surface) of the lithographic printing plate through the hydroxyethyl cellulose membrane, which is the main component of the protective layer. This is to prevent giving. Propylamine is an aliphatic amine.
イソプロピルアミン、ブチルアミン、ジエチルアミン、
ジプロピルアミン、ジイソプロピルアミン。Isopropylamine, butylamine, diethylamine,
Dipropylamine, diisopropylamine.
トリエチルアミン等が用いられる。Triethylamine etc. are used.
上記の三成分を水に溶解させて、本発明に係るガム液を
得ることができる。水１００重量部に対する各成分の配
合割合は以下の如き程度が好ましい。The gum liquid according to the present invention can be obtained by dissolving the above three components in water. The ratio of each component to 100 parts by weight of water is preferably as follows.
ヒドロキシエチルセルロースは０．５〜２ 重１部ｆ１
度が好ましい、ヒドロキシエチルセルロースが０．５Ｍ
量部未満となると平版印刷版の表面に形成される保護層
に微細孔（ピンホール）を生じやすくなり、画像部及び
非画像部が大気の悪影響を受けやすくなるという傾向を
生じる。また、ヒドロキシエチルセルロースは２重量部
を超えて配合してもヒドロキシエチルセルロースの製膜
性が向上しない傾向となるため、２重量部を超える配合
は不経済である。燐酸及び燐酸塩は０．０１〜０．１重
量部程度が好ましい、燐酸及び燐酸塩がｏ、ｏｉ重量部
未満となると、平版印刷版の非画像部を形成しているア
ルミニウム表面の改質が十分に図れない傾向となる。ま
た、燐酸及び燐酸塩は０．１ｆ！量部を超えて配合して
も、アルミニウム表面の改質が飽和状態に達するため、
０．１重量部を超える配合は不経済である。亜硫酸塩又
は亜硫酸水素塩及び脂肪族アミンは０．０１〜０．１重
量部程度が好ましい、これらが０６０１重量部未満であ
ると十分な還元作用を発揮できない傾向となり、ヒドロ
キシエチルセルロース膜を通しての画像部及び非画像部
への大気の悪影響を■止しがたい傾向となる。また、こ
れらを０．１重量部を超えて配合すると還元作用が強す
ぎ、却って平版印刷版の画像部及び非画像部に悪影響を
与える場合が生じる。Hydroxyethyl cellulose is 0.5 to 2 parts by weight f1
Hydroxyethylcellulose is preferably 0.5M
When the amount is less than 1 part, fine pores (pinholes) are likely to be formed in the protective layer formed on the surface of the lithographic printing plate, and image areas and non-image areas tend to be susceptible to the adverse effects of the atmosphere. Further, even if hydroxyethyl cellulose is blended in an amount exceeding 2 parts by weight, the film forming properties of hydroxyethyl cellulose tend not to improve, so blending in excess of 2 parts by weight is uneconomical. The amount of phosphoric acid and phosphate is preferably about 0.01 to 0.1 parts by weight. If the amount of phosphoric acid and phosphate is less than 0 or 0 parts by weight, the aluminum surface forming the non-image area of the lithographic printing plate will not be modified. There is a tendency to not be able to adequately measure this. Also, phosphoric acid and phosphates are 0.1f! Even if more than a certain amount is added, the modification of the aluminum surface will reach a saturated state.
Adding more than 0.1 part by weight is uneconomical. The amount of sulfite or hydrogen sulfite and aliphatic amine is preferably about 0.01 to 0.1 parts by weight. If these are less than 0.601 parts by weight, there is a tendency that sufficient reducing action cannot be exerted, and the image area through the hydroxyethyl cellulose membrane and the negative influence of the atmosphere on non-image areas tends to be difficult to stop. Furthermore, if more than 0.1 part by weight of these is blended, the reducing action is too strong and may even adversely affect the image areas and non-image areas of the lithographic printing plate.
本発明に係るガム液は、製版された平版印刷版の表面に
バーコーターやロールコータ−等ヲ用いて塗布する。そ
して、塗布後室温で若しくは加熱して乾燥することによ
り平版印刷版の表面に保護層を設けることができる。The gum liquid according to the present invention is applied to the surface of a prepared planographic printing plate using a bar coater, a roll coater, or the like. After coating, a protective layer can be provided on the surface of the lithographic printing plate by drying at room temperature or by heating.
（ニ）実施例
実施例１
ネガタイプ感光性平版印刷版材（日本製箔■製、商品名
アルスターＮＳ）に、陰の画像フィルムを重ねて４ＫＷ
超高圧水銀灯にて１ｍの距離から４０秒間露光した。そ
して、この露光後の感光性平版印刷版材を現像液にて室
温で２０秒間浸漬後水洗して平版印刷版を得た。(D) Examples Example 1 A negative image film was overlaid on a negative type photosensitive lithographic printing plate material (manufactured by Nippon Foil ■, product name: Ulster NS) to produce 4KW.
It was exposed for 40 seconds from a distance of 1 m using an ultra-high pressure mercury lamp. The exposed photosensitive planographic printing plate material was immersed in a developer for 20 seconds at room temperature and then washed with water to obtain a planographic printing plate.
このようにして製版された平版印刷版の表面に下記の組
成よりなるガム液を＃８のバーコーターで塗布した。そ
して、塗布後室温で放置して乾燥させ、平版印刷版の表
面に保護層を設けた。A gum solution having the composition shown below was applied to the surface of the planographic printing plate thus prepared using a #8 bar coater. After coating, the coating was left to dry at room temperature to provide a protective layer on the surface of the lithographic printing plate.
ヒドロキシエチルセルロース １．５重ＩＲＩ５燐
ｒｖｉ０．０５重１８Ｂ
燐酸ナトリウム塩 ０．０５重量部亜硫
酸水素ナトリウム塩 ０．０３ｆｆｉ量部ブチ
ルアミン ０．０３重量部水
１００重量部尚、このガム液
は調整後−年間放置しておいても凝集が生ぜず、平版印
刷版の表面に均質な保護層を設けることができた。Hydroxyethyl cellulose 1.5 parts IRI5 phosphorus rvi 0.05 parts by weight Sodium phosphate 0.05 parts by weight Sodium bisulfite 0.03 ffi parts Butylamine 0.03 parts by weight Water
100 parts by weight This gum solution did not aggregate even if it was allowed to stand for a year after preparation, and a homogeneous protective layer could be provided on the surface of the lithographic printing plate.
実施例２
実施例１で用いた平版印刷版に下記の組成よりなるガム
液を塗布し、その後実施例１と同様の方法で乾燥し平版
印刷版の表面に保護層を設けた。Example 2 A gum solution having the composition shown below was applied to the lithographic printing plate used in Example 1, and then dried in the same manner as in Example 1 to provide a protective layer on the surface of the lithographic printing plate.
ヒドロキシエチルセルロース １ 重１！燐酸
０．１重量部燐酸ナトリウ
ム塩 ０．１重量部亜硫酸水素ナトリウ
ム塩 ０．０５重量部ジプロピルアミン
０．０５重量部水
１００重量部このガム液も実施例１で用いたガム
液と同様、調整後−年間放置しておいても凝集が生ぜす
、平版印刷版の表面に均質な保護層を設けることができ
た。Hydroxyethyl cellulose 1 heavy 1! phosphoric acid
0.1 parts by weight Sodium phosphate 0.1 parts by weight Sodium bisulfite 0.05 parts by weight Dipropylamine
0.05 parts by weight water
100 parts by weight This gum solution, like the gum solution used in Example 1, was able to provide a homogeneous protective layer on the surface of the lithographic printing plate, which would not cause agglomeration even if left for a year after preparation.
比較例
実施例１で用いた平版印刷版に下記の組成よりなる天然
ガム液を塗布し、その後実施例１と同様の方法で乾燥し
、平版印刷版の表面に保ｗＬ層を設けた。Comparative Example A natural gum solution having the composition shown below was applied to the lithographic printing plate used in Example 1, and then dried in the same manner as in Example 1 to provide a wL retaining layer on the surface of the lithographic printing plate.
アラビアガム １．５重量部燐酸
０．１重量部燐酸ナトリ
ウム塩 ０．１重量部水
１００重量部この天然ガ
ム液は、調整後口ケ月放置しておくと凝集が生じ始め、
その後は平版印刷版の表面に均質な保護層を設けること
が回能となった。Gum arabic 1.5 parts by weight Phosphoric acid 0.1 parts by weight Sodium phosphate 0.1 parts by weight Water
100 parts by weight If this natural gum liquid is left for a month after preparation, it will begin to agglomerate.
After that, it became common practice to provide a homogeneous protective layer on the surface of a lithographic printing plate.
また、実施例１及び実施例２において保護層を設けた平
版印刷版と比較例において保護層を設けた平版印刷版と
を三ケ月間保存しておき、その後水洗して保護層を除去
し、これらの平版印刷版をハイデルＷＯＲＤ印刷機にか
けて印刷した。この結果、比較例における平版印刷版は
約５０００枚印刷した後において版面の地汚れが顕著と
なったのに対し、実施例１及び実施例２における平版印
刷版は約１００００枚印刷した後においても版面の地汚
れは顕著とならなかった。このことより明らかなように
、実施例１及び実施例２でガム液に配合されている亜硫
酸塩若しくは亜硫酸水素塩及び脂肪族アミンが平版印刷
版の非画像部であるアルミニウム表面の改質（印刷イン
キの不受理性の向上）に寄与していることがわかる。In addition, the planographic printing plates provided with the protective layer in Examples 1 and 2 and the planographic printing plates provided with the protective layer in the comparative example were stored for three months, and then washed with water to remove the protective layer. The lithographic printing plate was printed on a Heidel WORD printing machine. As a result, the lithographic printing plates in Comparative Example had noticeable background stains on the plate surface after printing about 5,000 sheets, whereas the lithographic printing plates in Examples 1 and 2 even after printing about 10,000 sheets. There was no noticeable background staining on the surface of the printing plate. As is clear from this, the sulfite or bisulfite and the aliphatic amine contained in the gum liquid in Examples 1 and 2 modified the aluminum surface (printing), which is the non-image area of the lithographic printing plate. It can be seen that this contributes to the improvement of ink receptivity.
（ホ）発明の効果
本発明に係る平版印刷版用ガム液は、従来のガム液と異
なり天然ガムを主体とせず、ヒドロキシエチルセルロー
スを主体とするものである。従って、天然ガムの場合の
如＜ＰＨの影響による水に対する熔解性の変動が少なく
、ガム液が凝集しにくい、依って、ガム液を長期間放置
しておいた後においても、平版印刷版の表面に良好に塗
布することができ、均質な保護層を平版印刷版の表面に
設けることができるという効果を奏する。また、ヒドロ
キシエチルセルロースは他の配合成分、例えば燐酸等と
共存させても熔解性が低下することがない、従って、本
発明に係るガム液中には種々の他の成分を添加すること
ができ、平版印刷版の非画像部等の改質に寄与しうる薬
剤を添加することができる。更に、ヒドロキシエチルセ
ルロースは天然ガムと比較して腐敗しにくいため、ガム
液中に防腐剤を添加する必要がなくなるという効果をも
奏する。(E) Effects of the Invention The gum liquid for lithographic printing plates according to the present invention, unlike conventional gum liquids, does not mainly contain natural gum, but mainly contains hydroxyethyl cellulose. Therefore, unlike the case of natural gum, there is little variation in solubility in water due to the influence of pH, and the gum liquid is less likely to aggregate. It has the effect of being able to be applied well to the surface and providing a homogeneous protective layer on the surface of the lithographic printing plate. Furthermore, the solubility of hydroxyethyl cellulose does not decrease even when it is coexisted with other ingredients such as phosphoric acid. Therefore, various other ingredients can be added to the gum liquid according to the present invention. A drug that can contribute to modifying the non-image areas of the lithographic printing plate can be added. Furthermore, since hydroxyethylcellulose is less susceptible to decay than natural gum, it also has the effect of eliminating the need to add preservatives to the gum liquid.
本発明に係るガム液には燐酸が配合されているので、ガ
ム液の平版印刷版の表面への塗布により設けられる保護
層には燐酸が存在することになる。Since the gum solution according to the present invention contains phosphoric acid, phosphoric acid is present in the protective layer provided by applying the gum solution to the surface of the lithographic printing plate.
従って、平版印刷版の非画像部（アルミニウム表面）の
改質、即ち非画像部の印刷インキネ受理性を向上させる
ことができる。また、ガム液中には燐酸と共に燐酸塩が
配合されているので、いわゆる緩衝溶液となり、ガム液
のＰＨの変化が少なくなるという効果、ひいてはＰＨの
影響によるヒドロキシエチルセルロースの溶解性の変動
が少すくなるという効果を奏する。従って、ガム液の凝
集が生じにくくなる。Therefore, it is possible to modify the non-image area (aluminum surface) of the lithographic printing plate, that is, to improve the printing ink receptivity of the non-image area. In addition, since the gum solution contains phosphoric acid and phosphate, it becomes a so-called buffer solution, which has the effect of reducing changes in the pH of the gum solution, and in turn, reduces fluctuations in the solubility of hydroxyethyl cellulose due to the influence of pH. It has the effect of becoming. Therefore, aggregation of the gum liquid is less likely to occur.
更に、本発明に係るガム液には亜硫酸塩又は亜硫酸水素
塩や脂肪族アミンの如き還元剤が配合されているので、
ガム液の平版印刷版の表面への塗布により設けられる保
護層には亜硫酸塩等が存在し、大気が保護層を通して平
版印刷版の表面に悪影響を及ぼすことを阻止しうるとい
う効果を特徴するFurthermore, since the gum liquid according to the present invention contains a reducing agent such as a sulfite or hydrogen sulfite or an aliphatic amine,
The protective layer provided by applying a gum solution to the surface of the lithographic printing plate contains sulfites, etc., and is characterized by the effect of preventing the atmosphere from having an adverse effect on the surface of the lithographic printing plate through the protective layer.
Claims (1)
硫酸塩又は亜硫酸水素塩と、脂肪族アミンとを含有する
ことを特徴とする平版印刷版用ガム液。A gum liquid for a lithographic printing plate, comprising hydroxyethyl cellulose, phosphoric acid, a phosphate, a sulfite or hydrogen sulfite, and an aliphatic amine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23539886A JPS6389391A (en) | 1986-10-01 | 1986-10-01 | Gum solution for planographic printing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23539886A JPS6389391A (en) | 1986-10-01 | 1986-10-01 | Gum solution for planographic printing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6389391A true JPS6389391A (en) | 1988-04-20 |
Family
ID=16985498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23539886A Pending JPS6389391A (en) | 1986-10-01 | 1986-10-01 | Gum solution for planographic printing plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6389391A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5065302A (en) * | 1973-10-11 | 1975-06-03 | ||
| JPS5383806A (en) * | 1976-12-28 | 1978-07-24 | Ricoh Kk | Treating solution for lithographic printing original plate |
| JPS53113601A (en) * | 1977-03-14 | 1978-10-04 | Fuji Photo Film Co Ltd | Protector for lithographic printing plate surface |
| JPS5519504A (en) * | 1978-06-23 | 1980-02-12 | Fuji Photo Film Co Ltd | Lithoprinting plate protective agent |
| JPS582854A (en) * | 1981-06-29 | 1983-01-08 | Mitsubishi Paper Mills Ltd | Method for making printing plate |
-
1986
- 1986-10-01 JP JP23539886A patent/JPS6389391A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5065302A (en) * | 1973-10-11 | 1975-06-03 | ||
| JPS5383806A (en) * | 1976-12-28 | 1978-07-24 | Ricoh Kk | Treating solution for lithographic printing original plate |
| JPS53113601A (en) * | 1977-03-14 | 1978-10-04 | Fuji Photo Film Co Ltd | Protector for lithographic printing plate surface |
| JPS5519504A (en) * | 1978-06-23 | 1980-02-12 | Fuji Photo Film Co Ltd | Lithoprinting plate protective agent |
| JPS582854A (en) * | 1981-06-29 | 1983-01-08 | Mitsubishi Paper Mills Ltd | Method for making printing plate |
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