Print 70-100 sheets each time the press is started. Select at least 4 sheets in a row for inspection. Do not select sheets for inspection while the press is speeding up!
Align the lateral register using only the center element at the top part of the sheet. Combine all colors marked with numbers to the base black that is not marked with a number. Do not check or attempt to align the lateral register using other elements!
The next step is to align the circumferential register using only the two elements on the right and left at the top of the sheet. All colors that have numbers are also aligned to the black mark. Do not check or attempt to align the circumferential register using other elements!
The results are then evaluated for possible deviations in the sheet transfer, focusing on all 9 elements. The presence or absence of “trapezium”, “bow”, doubling and other defects is checked, both in the individual units and as a whole. All control sheets are put aside and labeled. Photos are taken of each element, identifying its location on the sheet.
Important.
2. The test speed is between 70 and 85% of the maximum press speed.
3. If the press has a perfector, it must be set to a straight mode.
4. The goal of the test is NOT to achieve optimum register over the entire sheet!
| Maximum format of the press, mm | Tension, Nm |
| B3 (350×500) | 30-35 |
| B2 (540×750) | 40-45 |
| B1 (720×1050) | 55-65 |
| A0 (1200×850) | 65-70 |
| B0 (1000×1600) | 65-70 |
| Printing Press Manufacturer And Model | Total thickness = calibraied sheets + blanket, mm | Blanket Tension, Nm |
| MAN Roland 200/ 300/ 500 | 2,30 | 40-45 |
| MAN Roland 700 | 3,25 | 50-55 |
| MAN Roland 800/ 900 | 3,25 | 65-70 |
| Heidelberg SM102/ CD102 | 3,25 | 65 |
| Heidelberg XL105/ XL106 | 3,25 | 65 |
| Heidelberg SM72/ SM74/ SX74 | 3,25 | 40-45 |
| Heidelberg CD74/ XL75 | 3,25 | 40-45 |
| Heidelberg GTO46/ GTO52 | 3,25 | 30-35 |
| Heidelberg SM52/ SX52 | 3,25 | 30-35 |
| KBA Rapida 74 | 3,20 | 40-45 |
| KBA Rapida 105/ Rapida 106 | 3,20 | 60-65 |
Test duration: 3-5 hours
Amount of paper: required number of sheets is 100-150 per unit, 130-150 g/m2.
Requirements: New blankets and underlay sheets installed.
Blanket tension checked with a torque wrench.
The order of inks and colors:
B-C-M-Y. If there are more than 4 colour units, then colours other than triad colours must be used. If not possible, then M can alternate with C.
Printing is performed on plates made from the special file issued by us. The file consists of up to 12 individual colors. For the test, the number of plates is made starting from form 1 (Black) according to the number of printing units.
© 2024 PressInspection™ All Rights Reserved.
When using the materials of the site it is obligatory to indicate the link of source and the authorship.
© 2024 PressInspection™ All Rights Reserved.
When using the materials of the site it is obligatory to indicate the link of source and the authorship.