I have 15 years of experience in specialized self-adhesive materials, so I know that the most important tool in creating indelible barcodes and high-resolution graphics on synthetic or paper facestocks is the use of ribbons. In their absence, prints do not have the stability required to track long distances or be subjected to chemicals. The printhead heats the wax or resin layer onto the substrate forming an unbending bond. This will make sure that VIZLENT labels do not become scribbles when shipped or stored.
What Are Thermal Transfer Ribbons?
Thermal transfer ribbons are films on roll that are ink coated and the unsung heroes of our self-adhesive world. I have been analyzing label materials and consulted printing houses fifteen years later, and I am still fascinated with the engineering behind a thermal transfer ribbon. It is made up of a carrier of thin polyester material which is covered with a specialized ink which is able to melt only when the thermal head of the printer is heated. It is amazing to watch the solid ink melt into a permanent crisp image on a label. It is not ink on a roll, but a complicated system of delivery having protective backcoatings and of wax or resin binders.
I hate it when they compare such ribbons with plain carbon paper as the chemistry involved is much more elaborate. Ribbons connect the digital information and a permanent mark on a B2B product. The decision to use economical wax or rough full-resin determines the difference between a mediocre job and a masterpiece of high quality. I am aggravated when a cheap, mis-matched ribbon marks a clean facestock. They are supposed to be controlled in terms of temperature and pressure which would help to have the perfect finishing that we all want.
What is the lifespan of a thermal transfer ribbon?
Precise lifetime of a ribbon is complicated, however a typical roll of ribbon lasts one to two years under cool and dry conditions and not in contact with UV light. I have observed that ink levels can be blocked or become useless at an early stage due to humidity.
Wholesalers and printing houses should turn over inventory. As soon as the ribbon is attached to the machine, the life cycle is linear: the film will advance with the label stock, thus a full length of a ribbon will be used at once. Lapsed or improperly preserved ribbons result in low quality flakey prints. It is possible to keep the chemical integrity of the wax or resin at about 20 C. Handling the media with dignity is a sure way of ensuring that there is reliable production even when the deadline is approaching.
Do you need ribbon for thermal transfer?
It is indispensable to this mode of printing, you see, there is no escaping a ribbon. I am intrigued as a researcher that investigates the science of substrates to discover that the ink is deposited on a thin polyester film. In its absence, a thermal printhead is merely a hot piece of metal that is pressing on a plain piece of paper, and nothing more. This is reliant on the resistors in the printhead melting the ribbon coating of wax or resin and attaching it to the label.
I have 15 years of experience, so I am surprised when people believe that these printers act as direct thermal printers. They don’t. The ribbon is essential to use when label converters and wholesalers require high contrast permanent barcodes. Omitting it would remove any durability advantages and deliver images that do not pass the supply chain.
How many types of ribbons are there?
Three primary types are used, which include: Wax, wax-resin hybrids, and pure resin. Wax is cheap and can be used in general paper labels where a high degree of durability is not a concern. Wax-resin hybrids provide a compromise between strong enough to support synthetic facestocks, but not so expensive as to put a strain on the budget. Pure resin is the ultimate in terms of durability, which is designed to withstand hostile conditions and is resistant to polyimides.
I have fifteen years of experience in assisting label converters and I value the calmness of knowing that the right ribbon chemistry is chosen. It is important to have the right tension on each type to prevent wrinkles.
How do you load a thermal transfer ribbon?
It is not just a matter of peeling a roll onto a peg and loading a ribbon, but a couple of steps are to be observed. To begin with, remove the print-head assembly. It is almost as though one were opening a treasure chest: not a puff of dust. Then roll the supply roll onto the back spindle ensuring that the pigment side (dark side) is on the media. You will either end up typing to the air and will lose ribbon and money otherwise. Then pass the ribbon between the guide bars–imagine that it is a needle–but a heavy machine. Fix the leading edge to the take-up core using a strip of adhesive tape. Spin the take-up spindle by hand until the ribbon is tight; slack conquers a sharp label. It’s a bit of a dance. The matching should be precise or vertical wrinkles will destroy the entire batch.
