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Welcome to  ‘Ask The Expert’.  This page is moderated by industry consultant, Steve Wilkinson.  This page features the answers to your questions. Our visitors can also post comments to these questions/answers as well.  You can learn more about Steve’s background and our ‘Ask The Expert’ page by Clicking Here.

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February 27, 2014

Our anilox supplier has offered to audit our anilox. What information should we expect from this?

The first thing to remember about any anilox audit is that it’s a “snapshot” in time, in that the moment it is done it is already out of date assuming that you continue to use your anilox.

Fundamental information that you would expect from any audit would be anilox engraving, volume, and any obvious damage such as scoring, mechanical impact damage, chipping, general cell condition, and overall cleanliness. You will be surprised how many rolls are sent out for refurbishment when they are simply plugged with ink or coatings so if you are advised to replace an anilox that does not have any obvious damage,scoring or chipping please make sure it has been mechanically cleaned and its volume rechecked before making the final decision to have it reworked.

Remember about the “snapshot” in time comment so you need to act on the audit information immediately. Failure to do so really minimizes the benefit of the audit.

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February 10, 2014

We have recently purchased a new press that uses anilox and plate sleeves, what do we need to do to keep them in good condition?

The first thing to do is to make sure that every manager, supervisor and operator understands how much they cost to purchase and the cost of replacement. In my experience most personnel at all levels view sleeves as a disposable items, which ultimately they may be, but if properly cared for can give many years of

You mentioned both types of sleeves, that being anilox and plate sleeve. Both, however, cannot function without the appropriate air mandrel that you will apply compressed air into via an air inlet nipple either through the header of the mandrel or through the journal. The air escapes through a series of small holes that are drilled around the circumference of the mandrel usually at the end nearest the inlet and also in the center of the mandrel face. This will create an air layer that allows the sleeves to be slid onto the mandrel core before being locked in place when the air is stopped and the sleeve contracts back to its original diameter.

So just as you have recognized the importance keeping the sleeves in good condition it is just as important, if not more, to protect your air mandrel from any form of surface scratches, dings, or contamination. Failure to protect the surface of the mandrel will result in sleeves sticking to the core resulting in the operators inability to push them along the full face of the mandrel or indeed to be able to easily remove them.

Never use greater air pressure than recommended by the supplier as this can distort thinner walled sleeves and can result in catastrophic failure of the air mandrel. Always ensure the compressed air is dry and oil free as any contamination can cause rusting of the inside of the mandrel, which can leak onto the surface of the mandrel and the inside of the sleeve.This can make removal of the sleeve very difficult if not impossible if moisture or staining does build up on the end of the mandrel.

Each sleeve type has its own unique features and weaknesses but both are prone to premature failure due to mis-handling and lack of good housekeeping. In the case of the anilox sleeve they are generally the more complex structure with an inner composite tube, flexible inner core and an outer aluminum shell. It is the outer shell that is ceramic coated and laser engraved. The key to remember is that while ceramic is very abrasive resistant, they are very susceptable to impact damage. For this reason great care must be taken not to bump the sleeve into anything or to drop any heavy or sharp objects onto it as the ceramic will invariably crack and come away from the sleeve’s outer core.

You must store the anilox sleeve carefully at all times and take great care never to allow them to be dropped on the ends or knocked over, which will result in distortion of the sleeve and make it impossible to be slid onto its mandrel. The inside must be kept clean at all times and again great care must be taken to prevent scratching, scoring or any cuts to the inside of the sleeve. This applies to plate sleeves equally as much. You can store both types of sleeves vertically or horizontally but they must not be allowed to rest against another sleeve or rack support and when stored horizontally plastic tubing should be used if you choose to support them through the middle. If you prefer to store them in boxes, you shoud use cones placed in both ends if you choose to so that they again do not rest on the face of the sleeve.

In the case of plate sleeves, try to minimze the amount of cutting of the backing tape to help reduce cutting of the sleeve outer face, which can case them to split if cut too deeply or at least present a very rough surface to mount future plates onto.
While plate sleeves are a much simpler construction than an anilox sleeve they should always be treated with great care and kept as clean as possible at all times

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