The principle of the laser imprint transfer process is to combine the embossed film with laser micro-grooves that can be used multiple times with UV varnish. After UV curing, the laser embossed film is peeled off, and the cured UV varnish is cured. The surface forms a laser micro-groove that is the same as the surface of the laser embossed film. By refracting or diffusing the natural light, the visual effect can be enhanced.
The advantages of laser imprint transfer process are: 1 laser embossed film is very environmentally friendly compared to traditional hot stamping foil; 2 laser embossed film cost is lower than traditional hot stamping foil, many types, and can be reused 3 More than three; 3 can be used for local laser imprinting transfer; 4 simple process, low scrap rate.
The focus of laser imprint transfer is the quality of the laser embossed film and its cooperation with UV varnish. In addition, the following should be noted: the laser embossed film must not be treated by corona, etc., and its surface energy with the UV varnish contact surface is low (preferably less than 32mN/m); the thickness of the laser embossed film should be 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 seam must be hidden or visually unnoticeable; the base film of the laser embossed film PP film should be selected to avoid blocking UV light; the closer the surface tension of UV varnish is to the surface tension of PP film, the easier it is to peel off; the thickness of UV varnish layer is more than 2μm, which is equivalent to BCM of anilox roller The value is greater than 5; the laser embossed film must be kept flat when winding, and its edges should be neat to facilitate subsequent use.
Self-adhesive cold stamping products account for more than 80% of self-adhesive label hot stamping products. This is mainly because, compared to hot stamping, cold stamping is more energy-saving and environmentally friendly, and it can help label printing companies to increase production capacity, reduce the cost of hot stamping, and combine the hot stamping process to create a variety of hot stamping effects. .
Attention should be paid to the following matters when carrying out cold stamping, to avoid cold stamping of solid and mesh texts at the same time, as well as cold stamping of solid text, small text and reversed text; avoiding on absorbent substrates and coated substrates Perform cold stamping; avoid cold stamping on the mesh text; avoid excessive printing pressure, resulting in thicker graphics and hot stamping, and avoid cold stamping on the edge of the die-cut pattern, affecting die-cutting Knife life; avoid excessive tension of cold foil, resulting in cold hot stamping text. (Editor: Pang Junqi)
The above content is selected from the 16th issue of “Printing Technology ·Packaging and Decoration †in 2012. More journal content please pay attention to the journal channel .
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