JP2001056547A5 - - Google Patents
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- Publication number
- JP2001056547A5 JP2001056547A5 JP1999231398A JP23139899A JP2001056547A5 JP 2001056547 A5 JP2001056547 A5 JP 2001056547A5 JP 1999231398 A JP1999231398 A JP 1999231398A JP 23139899 A JP23139899 A JP 23139899A JP 2001056547 A5 JP2001056547 A5 JP 2001056547A5
- Authority
- JP
- Japan
- Prior art keywords
- lithographic printing
- printing plate
- plate material
- positive
- infrared laser
- 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
- 239000000463 material Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
Description
該赤外線レーザ用ポジ型平版印刷版材料に、前記赤外線レーザを露光すると、非露光部（画像部）では、該赤外線レーザ用ポジ型平版印刷版材料中のＩＲ染料等が、前記バインダー樹脂との相互作用により、該バインダー樹脂の溶解性を実質的に低下させる溶解阻止剤として働く。一方、露光部（非画像部）では、前記ＩＲ染料等が、光を吸収して熱を発生するため、該ＩＲ染料等と前記バインダー樹脂との相互作用が弱くなる。したがって、現像時には、前記露光部（非画像部）が、アルカリ現像液に溶解し、平版印刷版が形成される。
しかし、このような赤外線レーザ用ポジ型平版印刷版材料においては、ＵＶ露光により製版するポジ型平版印刷版材料と比べ、現像液の活性度に対するラチチュードが狭いため、活性度が高くなると、画像部の濃度低下、耐刷低下を、活性度が低くなると、現像不良を容易に引き起こす問題がある。
前記問題は、以下の、前記赤外線レーザ用ポジ型平版印刷版材料と、前記ＵＶ露光により製版するポジ型平版印刷版材料との製版メカニズムの本質的な相違に起因する。
When the infrared laser is exposed to the positive lithographic printing plate material for infrared laser, in the non-exposed portion (image portion), the IR dye or the like in the positive lithographic printing plate material for infrared laser is combined with the binder resin. By interaction, it acts as a dissolution inhibitor that substantially reduces the solubility of the binder resin. On the other hand, in the exposed portion (non-image portion), the IR dye or the like absorbs light to generate heat, so that the interaction between the IR dye or the like and the binder resin is weakened. Therefore, at the time of development, the exposed portion (non-image portion) is dissolved in an alkaline developer to form a lithographic printing plate.
However, in such a positive lithographic printing plate material for infrared laser, the latitude with respect to the activity of the developing solution is narrower than that of the positive lithographic printing plate material produced by UV exposure. If the activity is low , there is a problem that development defects are easily caused.
The problem is caused by the following essential difference in the plate-making mechanism between the positive-type lithographic printing plate material for infrared laser and the positive-type lithographic printing plate material produced by UV exposure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23139899A JP4315535B2 (en) | 1999-08-18 | 1999-08-18 | Quality control method for lithographic printing plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23139899A JP4315535B2 (en) | 1999-08-18 | 1999-08-18 | Quality control method for lithographic printing plates |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001056547A JP2001056547A (en) | 2001-02-27 |
| JP2001056547A5 true JP2001056547A5 (en) | 2006-08-31 |
| JP4315535B2 JP4315535B2 (en) | 2009-08-19 |
Family
ID=16922990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23139899A Expired - Fee Related JP4315535B2 (en) | 1999-08-18 | 1999-08-18 | Quality control method for lithographic printing plates |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4315535B2 (en) |
-
1999
- 1999-08-18 JP JP23139899A patent/JP4315535B2/en not_active Expired - Fee Related
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