[Chinese Packaging Network News] laser imprint transfer process is based on the principle of multi-use embossed film with laser micro-grooves and UV varnish combination casting, after UV curing, laser embossing film peeling, The surface of the cured UV varnish forms laser micro-grooves that are the same as the surface of the laser embossed film. By refraction or diffusion of natural light, visual effects can be enhanced.
The advantages of laser embossing transfer process are as follows: 1 The laser embossed film is very environmentally friendly compared to the traditional hot stamping foil; 2 The cost of the laser embossed film is lower than the traditional hot stamping foil, and it can be reused. More than 3; can be used for local laser imprint transfer; 4 the use of a simple process, low scrap rate.
Laser embossing transfer focuses on the quality of laser embossed film and its compatibility with UV varnish. In addition, the following should also be noted: laser embossed film must not be corona treatment, its surface energy with the UV varnish contact surface is low (preferably less than 32mN / m); laser embossed film thickness should be It may be thin, generally less than 18μm; the wider the width of the laser embossed film, the more uneven the tension on both sides of the film; the design of the laser embossed film seam must be hidden or visually imperceptible; the base film of the laser embossed film PP film should be used to avoid UV light irradiation; the surface tension of UV varnish is closer to the surface tension of PP film, the easier it is to be peeled off; the thickness of UV varnish layer is greater than 2 μm, which is equivalent to the BCM of the anilox roller. Values ​​greater than 5; laser embossed film must remain flat when rewinding, and its edges should be neat to facilitate subsequent use.
Self-adhesive cold stamping products account for more than 80% of adhesive label stamping products. This is mainly because, compared with hot stamping, cold stamping is more energy-efficient and environmentally friendly, and it can help label printing companies increase their production capacity, reduce the cost of hot stamping, and combine the first hot stamping process to create a changeable stamping effect. .
When cold stamping, attention should be paid to the following matters, to avoid the cold stamping of field and screen adjustment texts and cold stamping of the field, fine text, and reverse text at the same time; to avoid the use of absorbent printing materials and coated substrates. Cold stamping; avoid cold stamping on the screen adjustment graphics; avoid excessive printing pressure, resulting in thicker graphics lines and inaccurate overprinting after hot stamping; avoid cold stamping graphics on the edge of the die-cut pattern, affecting die-cutting Knife life; avoid cold foil tension is too large, resulting in cold hot stamping text is false.