Dampening water regulating scale, and dampening water control method
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorsTakaharu Yamamoto, Minoru Iwamoto
Life of this patent
Estimating the term…
Abstract
A dampening water regulating scale P includes first detecting patches PY1, PM1, PC1 and PK1, and second detecting patches PY2, PM2, PC2 and PK2. The first detecting patches PY1, PM1, PC1 and PK1 are formed of line patches having the number of lines at 400 lines per inch and a duty ratio at 67%. The second detecting patches PY2, PM2, PC2 and PK2 are formed of dot patches having the number of lines at 150 and a dot percentage at 80%.
Claims15
A dampening water regulating scale for regulating a feed rate of dampening water, comprising:
- a first detecting patch including lines or dots and having at least 200 lines per inch and an area ratio of at least 60%;
- and
- a second detecting patch including lines or dots and having a smaller number of lines and a larger area ratio than said first detecting patch;
- wherein said first detecting patch and said second detecting patch have substantially the same density when the feed rate of dampening water is controlled properly,
A dampening water control method for controlling a feed rate of dampening water by using a dampening water regulating scale, comprising:
- a platemaking step for making a printing plate having a first detecting patch including lines or dots and having at least 200 lines per inch and an area ratio of at least 60%, and a second detecting patch including lines or dots and having a smaller number of lines and a larger area ratio than said first detecting patch;
- a test printing step for making prints with the printing plate made in said platemaking step and with dampening water supplied at a proper feed rate;
- a confirming step for confirming a combination of an area ratio of said first detecting patch and an area ratio of said second detecting patch that causes an agreement in density between said first detecting patch and said second detecting patch on the prints made in said test printing step;
- a printing step for printing, along with an actual subject image, images of said first detecting patch and said second detecting patch having the area ratios confirmed in said confirming step;
- and
- a determining step for determining propriety of the feed rate of dampening water by comparing the images of the first detecting patch and the second detecting patch printed in said printing step.
A dampening water control method for controlling a feed rate of dampening water by using a dampening water regulating scale, comprising:
- a platemaking step for making a printing plate having a first detecting patch including lines or dots and having at least 200 lines per inch and an area ratio of at least 60%, and a second detecting patch including lines or dots and having a smaller number of lines and a larger area ratio than said first detecting patch;
- a test printing step for making prints with the printing plate made in said platemaking step and with dampening water supplied at a proper feed rate;
- a confirming step for confirming a combination of the number of lines of said first detecting patch and the number of lines of said second detecting patch that causes an agreement in density between said first detecting patch and said second detecting patch on the prints made in said test printing step;
- a printing step for printing, along with an actual subject image, images of said first detecting patch and said second detecting patch having the numbers of lines confirmed in said confirming step;
- and
- a determining step for determining propriety of the feed rate of dampening water by comparing the images of the first detecting patch and the second detecting patch printed in said printing step.
Dependencies are inferred from the claim text.