Getting to the root cause of web breaks can be an overwhelming task. No matter what the source is, one needs to get rid of them at the earliest. Here are some tips for rectifying web breaks while carrying out printing tasks in an offset printing press, such as the
Heidelberg SM 74 or the Heidelberg MOVH:
This may be the biggest reason behind web breaks. Check if there have been any changes in the settings. If yes, then restore them to the way it was before the web breaks appeared. Further, it is also important to check if the web has a bit of a bounce is not overly tight.
Rippled or wrinkled paper can lead to the breaking of the web. Though paper has the capability to take some amount of stress, owing to its elasticity, yet too much of strain can cause a web break. Further, it could also be a possibility that the entire batch of paper is not of good quality. For determining this, one will have to keep a tab of which day the paper was made and out of which reel, by checking its roll number. One may try different positions on the reel to get an idea whether a particular roll has a problem.
Call a trained mechanic and get the machine inspected across all the parameters, starting from rollers, slitters, to idlers, and nip pressure. Nip rollers have a tendency to wear down after a while. One may make use of grease or ink on them. Ensure that the idler rollers are cleaned thoroughly.
It is essential to check whether the air flow bars are free from build-up and stand at the correct height from the web.
One should always remember that excess water may cause it to get accumulated at the gap. The pressman should make sure that a proper balance is maintained between the ink and water.
There are several other ways of avoiding or rectifying web breaks. Those on the lookout to buy Used Heidelberg 72 v or any other branded printing press may get in touch with Goodmachine, a reliable Used Heidelberg Printing Machines Dealer.