Many times, during job changeovers, we are in a time crunch to get the next job on press and up and running. Cleaning chamber parts and re-assembling them can be time-consuming. Quite often, technicians are wiping, scraping, and practically chiseling dried ink. If not done properly, dried ink remnants remain on blade clamps and end … Read More...
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10 Things To Know About Flexo End Seals Read More...
For the results of this test to be meaningful, the following four points are absolutely essential and must be followed: Do not touch or in any way contaminate the surface to be tested. Dirty surfaces lose their wettability. Do not use contaminated or outdated ACCU DYNE TEST™ marker pens. Never retest the same location on … Read More...
The proper connections to the ink pumps and viscosity control units are vital for proper operation and quick change over. The day of the hose clamp and screwdriver are a thing of the past. Having the proper connections and the ink hoses routed correctly make for a smooth ink delivery system. This also reduces downtime … Read More...
The UV Ink Spitting Problem UV flexo printing continues to achieve outstanding results in the flexo industry. However, despite the fact that many of the ink companies have dropped their viscosities for UV inks the phenomenon of UV ink spitting still persists. Although there are numerous explanations as to the cause of ink spitting, the … Read More...
The Ghosting Problem Ghosting is usually considered the presence of a faint image of a design in solid printing areas that is not intended to receive that portion of the image. This print defect is always in the machine direction and usually is a repeated pattern. Ghosting was inherited mostly from the advent of the … Read More...
Submitted by Bill Poulson, Harper Graphic Solutions' Northeast Technical Graphics Advisor. Managing your anilox rolls is a preventive way of getting control of your graphic quality as well as press efficiency. Downtime is the enemy, and every attempt made to minimize downtime is a worthwhile effort. Whether you are a wide web or a narrow … Read More...
Scoring or "shiny-lines" are a sometimes-controversial subject on what causes them. What is not controversial is that they can ruin expensive anilox rolls and cause waste in print jobs. As in most problematic situations, it is never one thing that causes or can eliminate the problem. When diagnosing the problem, it is also important to … Read More...
The Problem of Ink Micro-Foaming Although improvements in inks have reduced many ink foaming issues, continued increases in press speeds have worked against the elimination of this as a consideration press-side, especially with many process and metallic inks. Analysis as to the cause of this microfoam formation suggests that the air bubbles become entrapped as … Read More...
(Part 4 of a 5 part series) Maintaining the perfect dot is not easy, and to do so we must control several factors, one of which is knowing when the photopolymer plate has become worn to the point that it will have adverse effects on the printed product. But how open have you replaced costly … Read More...