![]() Instead, the print repeat length will be checked immediately after the winder pulling unit, as close to the winder as possible.Įach of the nip rolls are responsible for maintaining the proper, uniform tension of the material throughout the entire process. If we consider, for example, the case of a slitter-rewinder integrated with the flexo printing machine, the tension will be checked in 5 different points along the process: In order to properly control the tension in any of the zones, it must be measured, or approximated, by some means. lengths in which the web is under the same tension: the unwind zone, intermediate tension zones (typically multiple) and the rewind zone. Overall, the printing machine can be divided into three tension zones, i.e. Proper and constant tensioning of the specific material before, during and after the printing process is of the utmost importance when it comes to ensuring a constant print repeat length. ![]() Specifically, there are three main factors to consider that affect the print repeat length: the tensioning of the material during the entire process, the structural stability of the machine and the temperature of the air used in drying. What factors can affect print repeat length in flexographic printing? The materials, such as LDPE or spunbond, are subjected to a determined tension during the printing process and, if this tension is not correctly set up and maintained, it can cause variations in the print repeat length outside the defined tolerances, with the result that the non-compliant reel must be discarded or, even worse, that the entire batch of reels in which the defective reel was present becomes the subject of dispute by the converter. This because the materials used for hygiene products are characterized by very low grammages and therefore they are extremely sensitive to factors such as tension and temperature. The last thing I need is misfiring or backfiring on my engine.One of the greatest challenge in the printing process, especially in the hygienic industry, is ensuring a constant repeat length throughout the print job. Even though the cylinders are numbered I am more inclined to leave this task up to the mechanics. Had I installed them without such knowledge in advance it might have created a problem. I didn’t realize that the spark plugs have to be put in according to the firing order of the engine. I thought about tackling harder tasks like changing the spark plugs however after reading this I can see that perhaps I should leave that to the experts. Some things I can do myself like changing the oil and stuff like that. ![]() Takes longer, but that way you can be sure the job gets done right. Disconnect one spark plug wire, replace that spark plug, hook it back up, and so on. If you just want to change your plugs, and you're worried about messing something up, the safest way to do it is to just do one at a time. With the diagram I really don’t think that you could go wrong by doing it yourself, but without the diagram, I wouldn’t attempt it even if you fancied yourself as an expert mechanic. It depends on what type of engine you have. In other words, it’s not necessarily 1,2,3,4, etc. You have to set up them up according to the sequence as displayed in the firing order diagram, and as explained, that is not always linear. December 30, - Even knowing the numbers is not enough to properly set up the spark plugs.
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