The development of modern cold stamping foil stems from simple cold foil, which is designed as a mold-free technology for applying metal finishes to self-adhesive labels produced on reel-to-reel printing machines.
There are a lot of benefits to this process, and there are some shortcomings, although cold frustration has made great progress since then.
The benefits of reel-to-reel printing are obvious.
If hot is carried out-
At the end of the printing process, the printing speed is limited by the relatively slow printing speed.
If the printing is maintained and the foil is applied as a separate channel, a corresponding cost impact is generated.
In addition, the cost of the hot foil mold is relatively high compared to the printing plate or sleeve, and the heating mold requires energy.
Reel-to-reel cold frustration includes printing UV curing adhesive in the desired foil design, laminating foil to adhesive through nip, curing adhesive with UV lamp, and separate the foil from the printed net.
The foil removed from the carrier film is the design of the printing adhesive as it has been UV-cured and therefore adheres to the foil.
By using cold foil, the speed is limited only by the strength of the UV lamp or the light density of the foil.
The aluminum layer in the foil must be thinner than the aluminum layer commonly used in the stamping foil to allow sufficient transparency over UV rays.
It is true that when directly frustrating the transparent film, it is irrelevant because the light can reach the adhesive through the back of the film, but this is often not the case.
Frustration is usually carried out on opaque white ink, which can be screened on the label with silk before the adhesive and foil are applied.
This places an opaque layer between the film and the foil, so the beam must pass through the lacquer or top coating of the cold foil.
UV rays reach the adhesive through the paint layer and the aluminum layer, so the aluminum must be as transparent as possible.
The more opaque it is, the more lights it needs, or the slower it will run.
Since the printer wants the lamp to be set in a fixed position and will not change because of each work, all curing is usually done by foil, not by printed film.
Given that this can be done, then the cold frustration is much faster than the specific heat frustration, and of course the mold is not needed, so that not only can the mold be saved
Reduce costs, but also save energy.
The savings are very suitable these days.
So why is it that none of the reel-to-reel work is blocked using cold stamping foil?
It is mainly about quality.
Cold foiling is generally not as brilliant as hot foiling, and the range offered by most stamping foil manufacturers is very limited.
They also tend not to accept printing very much.
It can be attached if the overprint is small enough, although the surface energy on the surface of the cold foil is quite low (low dyne level).
Larger printing areas tend to have poor scratch resistance and adhesive tape adhesion, although many customers accept this at a lower cost.
Modern developments, however, tend to overcome these problems, although the real over-printed cold foil is hard to find and largely depends on the type of ink used.
The development of modern cold foil includes sheet feeding offset printing litho application, applying adhesive through traditional oxidation drying offset printing, and then producing attractive non-ferrous metal effect with silver foil covered with oxidation drying offset printing transparent ink.
The process has now been patented.
Further development involves offsetting UV Adhesives and inks, although the adhesion of UV inks to foil surfaces is still a problem here.
The number of cold foil used around the world is rapidly increasing, most of which are in the field of offset printing, and major printing machine suppliers in Europe are providing dedicated manufacturing equipment and adding-
Can be modified to ons on existing devices of the printer.
With more development work carried out by hot stamping foil manufacturers, printing quality is improving, and the quality of modern cold stamping foil is rapidly approaching hot stamping foil.