impression per hour

ar17

Well-known member
hi guys this happy new year.
trying toset quota for our daily printing and would like to know if anybody has a chart or recommended run per hour if we are using different grammage? example, 250 gsm is supposed to have how many impressions per hour compared to a 380 gsm substrate using same cmyk press. thanks for inputs...


best
 

SteveSuffRIT

Well-known member
PIA (Printing Industries of America) published this type of data.
Speed varies by type of printing process (Litho, Flexo, Gravure) and press design (Sheetfed, Perfector, Web-Heatset/Coldset).
Modern 40" (8 up) sheetfed offset litho press, straight, with in-line coater is about 20K sph or iph for 60lb Text (0.004"). About -10% slower for 2/sided perfecting?
Almost independent of number of colors, that is a make-ready (MR) issue.
 

rasec2101

New member
hi guys this happy new year.
trying toset quota for our daily printing and would like to know if anybody has a chart or recommended run per hour if we are using different grammage? example, 250 gsm is supposed to have how many impressions per hour compared to a 380 gsm substrate using same cmyk press. thanks for inputs...


best
Even the machine manufacturer just provide us the mechanical speed of the press machine and when it comes to the real production run, it really varies with the grammage of the substrate or paper not to mention the quality and the size of the paper you will run on the machine, however, we simply put 75-80 percent of the mechanical as our average. this is due to stoppage during production such as loading in feeder file and unloading in delivery, those machines with continuous feeder and continuous delivery have usually more production out put.
 

turbotom1052

Well-known member
How fast the press cylinders will turn, and how many sheets per hour on average you can put on your floor, are often WAY different figures. It seems that the press manufactures will always quote the presses top running speeds. They will also falsely quote the quickest possible makeready times. Both of these figures rarely are real world achievable numbers. Company owners will often buy a press based on these quoted figures, and then expect their press crews to deliver these "sales pitch" numbers. Its been my experience that the wishful thinking of many plant owners, do not take into consideration the cost saving measures many companies insist on making as company policy. The best example that I can think of is the upper managements policy of buying sub par substrates. The allure of the substantial savings that come from purchasing job lot paper is often too great to pass up for purchasing agents. So what happens is often as follows.... The company low bids, and gets the contract for a big job based on a substantial materials savings, by buying XYZ job lot paper. The job gets to press, and as soon as the pressman starts laying down some ink, the sheet begins to fall apart. This unstable sheet will often demand lower press speeds just to complete the job. Even with the lower press speeds, the crappy paper will require frequent press stops to clean blankets of hickeys and excessive paper sizing. What your left with at the end of the job, is often sub par printing, and can often require a reprint or at the very least a discount. The saddest part of all of this is that when these things go wrong, fingers are often pointed everywhere but where they belong to be pointed. The estimator has fingers pointed in his or her direction for buying the crappy paper. The press crews wind up being blamed for either taking too long to complete the job, or for poor quality. The reality of all of this is that "the fish stinks from the head" Its upper management that has set the policy that all employees are to follow or else. Im certain that the purchasing agent or production person would much prefer to buy first quality sheet of paper and have a clear head that it will perform. I know that after many years as a pressroom employee, and manager, I would much prefer to be set up to succeed rather than fail. After over 3 decades of running presses and managing press crews ive noticed this dynamic becoming more prevalent.
So my suggest to the original poster is to focus more on the number of sheets per hour that your press crew can put on the floor, while still producing a quality job, than in determining a one size fits all number that does not account for the many variables we encounter in the daily production of quality printing.
 
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alibryan

Well-known member
SPH production is usually estimated using a fraction of the press’s top speed. I think that’s pretty normal as there is such a thing as unknown variables, and there are reasons that presses come equipped with a speed adjustment. With that said; there are some companies that actually do expect their machines to run at full speed, all of the time, regardless of substrate (user experience may vary).
 

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