Cold stamping technology refers to the method of transferring hot stamping foil to the printing material using UV adhesive. The cold stamping process can be divided into two types: dry film cold stamping and wet film cold stamping.
The dry lamination cold stamping process is to cure the coated UV adhesive before hot stamping. Ten years ago, when the cold stamping technology had just come out, the dry lamination cold stamping process was used. The main process steps are as follows.
(1) Print cationic UV adhesive on the web printing material.
(2) Curing the UV adhesive.
(3) Use the pressure roller to make the cold stamping foil and the printing material together.
(4) Peel off the excess hot stamping foil from the printing material, leaving only the required hot stamping text on the part coated with adhesive.
It is worth noting that when using the dry film cold stamping process, the curing of the UV adhesive should be carried out quickly, but it cannot be cured completely. It must be guaranteed that it still has a certain viscosity after curing, so that it can be very compatible with hot stamping foil It sticks together well.
The wet lamination cold stamping process is to apply UV adhesive and then hot stamping and then curing the UV adhesive. The main process steps are as follows.
(1) Print free radical UV adhesive on the web printing material.
(2) Composite cold stamping foil on the printing material.
(3) Curing the free radical UV adhesive, because the adhesive is now sandwiched between the cold stamping foil and the printing material, UV light must pass through the hot stamping foil to reach the adhesive layer.
(4) Peel the hot stamping foil from the printing material, and form hot stamping graphics on the printing material.
It should be noted:
1. The wet film lamination cold stamping process replaces the traditional cationic UV adhesive with free radical UV adhesive;
2. The initial adhesive strength of UV adhesive should be strong, and it can no longer be sticky after curing;
3. The aluminized layer of hot stamping foil should have a certain light transmittance to ensure that UV light can pass through and initiate the curing reaction of UV adhesive.
The wet lamination cold stamping process can be used for hot stamping metal foil or holographic foil on the printing machine, and its application range is becoming wider and wider. At present, many narrow-width carton and label flexo printing machines already have this kind of online cold stamping capability.
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