The basic operation of offset press mainly refers to plate-setting, proofreading, color-correcting, cleaning ink roller, replacing blanket, loading paper, bumping paper, changing rules, etc.
1. The main points of operation
Plate-setting and proofreading are regular tasks for operating offset presses, and are also very important tasks. The quality and speed of the proofreading operation directly affect the product quality and production efficiency. Fast, accurate, and high-quality proofreading requires long-term training to obtain, especially the strength and method of pulling the plate, which requires long-term practice to master. The following only provides some theoretical guidance for the proofreading version, and is also a summary and requirements of the proofreading version, which will be helpful to the proofreading version. The most important requirement for the proofreading is to prevent the artificial deformation of the printing plate. It is also important and necessary for operators who operate automatic plate-changing machines to master manual plate-changing skills.
1. The usable printing plate should be cleaned after removing the ink, coated with protective glue, dried (blow-dried) and stored in a darkroom upright, and can not be stacked flat.
2. Before installing the version, you should first loosen the trailing version of the clip, let the version of the clip back into place, and come and go to the center (manual version of the machine).
3. The printing plate gripper must be installed in place (ie the bottom of the gripper plate holder).
4. The multi-color machine mounting plate should be positioned in two directions first to ensure that the positions of the up and down and the directions of the plates are consistent. Machines with positioning devices should allow positioning pins to be inserted into the positioning holes of the printing plate, and those without positioning should find ways to perform bidirectional positioning.
5. When installing the plate, the water roller, ink roller or pressure should be closed first, so that the printing plate and the cylinder are closely attached to prevent the printing plate from being distorted and deformed.
6. After installing the version, you should tighten the tip first and then hold the mouth tightly.
7. The proofreading paper must be pasted (referring to the bad paper used to balance the ink color after pressure printing). Proofreading paper (referring to the printed sheet or white paper used to correct the printing plate) 2-3 sheets at a time.
8. The last sheet of the input paper cannot generally be used as the basis for proofreading.
9. Proofreading should be calibrated first (check whether the rules are consistent), and the proofs can only be used for proofreading. Any changes in the rules and paper thickness must be calibrated first. The school regulations require at least 5 proof sheets at a time.
10. Folding, cutting or reflexive printing, the mouth must be flat, the error should be less than 0.2mm (2 lines), that is, come and go consistent. General printing should also try to flatten the mouth.
11. All the prints that need to be folded should be folded and checked: whether the size, page number, position, and rules of each page meet the requirements.
12. All the rules should fall on the printed sheet, and there must be no missing one.
13. For the printed parts that need to be molded, the size of the original manuscript (box sample, etc.) should be used, and various tongues and other empty spaces should be kept.
14. The proofreading and ink color should be carried out at the same time to improve production efficiency.
15. For multi-color machine proofing, the flatter plate should be selected as the reference to adjust the position of other plates to reduce the workload of proofing.
16. In principle, the fine-tuning (automatic adjustment) of the printing plate of the multi-color machine should be carried out in the state of starting (running).
17. Before installing another set of printing plates in the multi-color machine, the fine adjustment of the printing plates should be reset (zero adjustment).
18. Before calibrating the version, the front rule should be leveled (refer to the premise that the front rule is not flat).
19. Manual pull version.
â‘ When the left and right ends are pulled in the same direction: Loosen all the tightening screws of the other party, and then tighten the other side of the tightening screws after pulling enough. Only pull the screws at both ends when pulling the plate.
â‘¡When only one end needs to be pulled: Loosen the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the other side of the plate. Same as above (after the top plate, the top plate screw should be returned a few times, relative to the single plate clamp machine).
â‘¢When the two ends are pulled in opposite directions: each end is pulled separately, the method is the same as â‘¡.
20. Quality requirements for overprinting: fine prints have a gauge line error of less than 0.1 mm n (1 line), and general gauges have a gauge line error of less than 0.2 m (2 lines). The important part should first ensure registration, and all regulations must be registered.
twenty one. Check the printing plate before installing the plate: do not install the unqualified printing plate, do not install the wrong printing plate, foreign matter on the reverse side of the printing plate should be removed.
twenty two. All the pull-out and clamp screws should be tightened. The pull-out cannot be applied with too much force. If it cannot be pulled, the cause of the analysis should be searched for.
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