Oscillating trim winders

Trim / waste disposal is a subject that is integral to efficient winding, but conceptually it can be a bit difficult to explain to customers who aren't familiar with managing waste. A lot of companies go to great lengths to try and minimise the amount of waste they generate, which makes sense as far as economics and environmental awareness, but sometimes waste cannot be avoided.

The video below shows a trim winder that was a part of a large slitter we recently built for a regular customer of ours. This slitter rewinder was designed to convert large rolls of metallized polyester, which is supplied on rolls that are not coated the full width of the web, so a trim needs to be cut off during the winding / slitting process. Some customers wind trim waste material onto cores on the rewind shafts, and some let narrow trims fall to the floor, but while both options are workable both can be problematic for operators and potentially damaging to materials.

Trim winders like the ones shown in the video below help maintain tension in the cutting zone (where problems can develop due to the uncoated or thinner edge of the web). Some trim winders oscillate (move backwards and forwards) to ensure that the maximum amount of waste trim can be wound onto a relatively small core / roll.

Trim removal systems can be added to third party slitters (and other winding, coating or laminating machines), however, due to the sometimes complex commissioning process we currently only offer trim removal upgrades within Europe.

Request a quote for a trim removal system...

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Trim removal on slitters

A trim fan attached to a slitter. As discussed previously on this blog the process of slitting (at its most basic) can be reduced to the one-line description of ' a big roll is loaded on one side of the slitter rewinder, and smaller rolls are loaded off the other side' and that's fine... most of the time. Here comes the example! If a 1000mm wide roll is loaded onto a rewinder and is slit down into rolls that are 212mm wide then four rolls would be produced. If your mental maths is up to scratch you might have noticed that 4x212 does not equal 1000, and that means that from the original / master / jumbo roll there will be roughly 117mm left over. Sometimes this happens because the edges of jumbo rolls are discarded due to damage, print reasons or simply because the material being slit isn't coated all the way to the edges of the roll. So what happens to this waste material? Waste material can be wound onto cores in the same way 'correct' rolls are,

Slitter core alignment using lasers

Lasers and slitters go together like cheese and biscuits, and fitting laser scoring, cutting and perforation devices to slitter rewinders is something that has now become reasonably commonplace here in our factory, but lasers can do a lot more than cut and perforate. We've recently had a huge upsurge in interest in our ' ComputaCore ' laser core alignment system, and because it is such a simple system to control and operate it can be a little bit challenging finding many things to write about it - it's simple and it works very well! But what's in the box? We've made our laser core alignment kit as easy to fit as it is to operate, and to highlight the simplicity of this approach to perfect core alignment we've recently published a post on the subject on our blog here - https://www.universalconvertingequipment.com/laser-core-alignment-whats-in-the-kit-and-how-does-it-work We're planning a new promotional video for our laser core alignment syste

Skymark are using laser to stay head of the competition

The news has just gone public that Skymark Packaging Ltd have bought a Universal X6lp Laser perforation Slitter Rewinder for their facility in Scunthorpe, here in the UK. Skymark have recently been in the news for declaring that their experience of the flexible packaging market is particularly buoyant at the moment. Their reasoning is that following the Brexit vote, a lot of supply chain risk is being mitigated by companies processing more materials here in the UK. In addition to sharing common features with our X6 slitter, the X6lp can also laser perforate and produce easy open scribe lines. The easy open packaging systems are popular with producers who want their products to be consumer-friendly, but to still be able to protect the contents of the packaging.

Slitter Man

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