Techtips

It's easy to overlook a small plate problem when it isn't causing a glaring issue later in the printing process. Catching these small signs early can save a lot of headaches down the road... Floor thickness is set by the washout, not the back exposure time. While the plate relief may be correct, the back exposure […] Read More...
Flexo End Seals When installing your seals, make sure the face of the seal fits squarely against the chamber with no gaps or distortion. The condition of the anilox roll can also play a role in chamber leaks. If the roll lacks a dead band, ink will build up there and contribute to end seal […] Read More...
Making plates isn't necessarily rocket science, but it is, indeed, a science! It is beneficial to track and quantify platemaking conditions so that changes in the equipment or finished plates are found before they cause costly problems on press. Measuring the UVA light output of your plate exposure unit is a great place to start. Most plate […] 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 Do not use contaminated or outdated ACCU DYNE TEST™ marker pens.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...
Gear marks that are evenly spaced, over distances longer than the pitch of the press gears, may be generated at the die station. Often times butt-cut dies, sheeter dies and rectangle dies, with long lengths of blade running across the web, are required to produce labels to meet customer specs. These long cross cut dies […] 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 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 most common explanation […] Read More...
The Problem Even when it seems you are doing everything you normally do during the platemaking process, sometimes defects surface in the UPC area. In order to avoid rejection by the customer or even fines that may be incurred at the retail location, it is critical that UPC's are reproduced at the highest level of […] 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...