HP Latex 2700 User Guide 3 - Page 273

TIP: When suffering from extreme skew that tends to increase (normally with highly temperature-sensitive substrates), try to use a thicker core that is not deformed by the rubber traction grooves on the spindle when inflated. Then follow the guidelines below for reducing skew. Generally, the main contributor to skew is an imprecise substrate load, and the effects of that are worse with wide rolls. However, if you have some skew or telescoping but this does not affect your print quality, and does not generate wrinkles in the substrate (see There are wrinkles and ink smears on the substrate on page 266), there is no need to take any action. However, you are recommended to reload the substrate in order to eliminate any potential problem. Some substrate rolls already come with skew; in that case the recommendations are as follows: 1. Try to load the substrate following the correct procedure, taking as a reference of the roll's width the average between peaks of skew. 2. Start with the recommended configuration and increase vacuum and tensions step by step (i to iv), following the table below. Vacuum and tensions Substrate category Recommended i ii iii iv v Generic Vinyl -vacuum, input tension -output tension 150 60 50 150 60 55 200 60 55 200 70 60 200 70 65 250 80 70 Generic Cast Vinyl 100 35 100 45 150 60 200 75 250 80 300 100 30 40 55 80 85 100 PVC Banner 100 60 100 60 100 65 200 70 300 75 350 85 60 65 70 75 80 85 Coated Paper and Wallpaper 150 60 150 65 200 65 250 70 300 75 350 85 50 55 55 60 65 85 Offset Paper 150 60 150 65 200 65 250 70 300 75 350 85 50 55 55 60 65 85 PET Film 100 60 100 65 100 70 200 70 250 75 350 85 55 60 65 75 80 85 PP PE Film and Banner 150 60 150 65 150 70 250 70 300 75 350 85 50 55 60 70 80 85 Canvas 150 70 150 75 150 80 250 80 300 85 350 85 55 60 65 75 80 85 Generic Textile 0 50 50 50 100 60 150 65 250 70 350 85 40 45 50 60 75 85 There are wrinkles and ink smears on the substrate Wrinkles in the substrate indicate that the substrate settings that control the substrate shape are not optimized. This can cause various printing defects. 266 Chapter 13 Troubleshoot substrate issues