Detection 1. Tape detection In India crossed the surface of section
with blade length of about 5mm, "×" shape, with transparent tape (width
15mm, adhesive force of about 3 ~ 4N/20mm) paste, remove the clear tape
printed materials fade in time if the 10% above, the problem is more
serious note deinking marked cards.
2. Fingernail Detection With a fingernail (or other blunt object) scuffing the surface of a number of print, if nails (or blunt object) there is more ink on the stick, it indicates a serious problem deinking.
3. Off pressure method Off any printed product will look, with a nail in the crease Department scuffing, if the nails have more ink on the stick, it indicates a serious problem deinking.
Solution Research and practice show that the composite nature of paper, ink thickness, UV light and environmental factors contributed to UV printing the main reason for deinking printed materials. Institute of Printing Technology
To solve the problem from the following deinking aspects.
1. Compound Paper Composite paper is made from cardboard (substrate), adhesive layer and the composition of non-absorbent films and so on, sometimes including the aluminum layer. Printing with UV inks in contact mainly polyethylene film, PVC film, polypropylene film, foil and other non-absorbent material or aluminum layer. The use of a common solvent-based ink printing composite paper, you need some drying time, but also by Dusting And drying rack or in ink mixed with other additives, the use of UV inks to avoid these problems, but only on the surface to be processed.
(1) on the treatment of non-absorbent material
Corona Treatment Corona treatment is a shock treatment, the positive and negative corona devices were ground plane and dielectric air nozzle, using high-frequency high-voltage electric shock elements to the air nozzle from the dielectric, with a high-energy The free e-speeding towards the cathode, so that we can change the polarity of non-absorbent materials and increased surface roughness.
varnish primer treatment When the composite material of paper surface corona treatment should not do, you can consider the surface of the composite paper varnish primer treatment. Varnish primer approach is divided into treatment and off-line connection varnish varnish treatment. Degree of thickness of varnish must be moderate, thick easy to wasteful, too thin is easy to cause trouble printing.
flame treatment Generally applicable to irregular shape of the material.
Actual production is usually a multidisciplinary approach, including corona treatment and varnish primer combination of the most common treatment to good effect. Under normal circumstances, corona treatment infraredink , the rules will be a relatively rough surface, roll formed in the lacquer adhesion relatively large, suitable for UV printing. However, the thickness of the varnish layer control is also very important, too thick or too thin deinking problems may arise. Does not allow copying
(2) the combination of aluminum coating and ink form
When the composite material of paper surface layer of aluminum, there are two situations: one is the aluminum layer with varnish, and the combination of the two more closely, UV ink printed on the varnish on, then it will produce off Mexican phenomenon depends on the aluminum coated with plastic film layer adhesion to Practice has proved that this phenomenon is more common under the deinking; the other is direct contact with aluminum layer and the ink, the printability of paper at this time Compound is good.
2. Fingernail Detection With a fingernail (or other blunt object) scuffing the surface of a number of print, if nails (or blunt object) there is more ink on the stick, it indicates a serious problem deinking.
3. Off pressure method Off any printed product will look, with a nail in the crease Department scuffing, if the nails have more ink on the stick, it indicates a serious problem deinking.
Solution Research and practice show that the composite nature of paper, ink thickness, UV light and environmental factors contributed to UV printing the main reason for deinking printed materials. Institute of Printing Technology
To solve the problem from the following deinking aspects.
1. Compound Paper Composite paper is made from cardboard (substrate), adhesive layer and the composition of non-absorbent films and so on, sometimes including the aluminum layer. Printing with UV inks in contact mainly polyethylene film, PVC film, polypropylene film, foil and other non-absorbent material or aluminum layer. The use of a common solvent-based ink printing composite paper, you need some drying time, but also by Dusting And drying rack or in ink mixed with other additives, the use of UV inks to avoid these problems, but only on the surface to be processed.
Corona Treatment Corona treatment is a shock treatment, the positive and negative corona devices were ground plane and dielectric air nozzle, using high-frequency high-voltage electric shock elements to the air nozzle from the dielectric, with a high-energy The free e-speeding towards the cathode, so that we can change the polarity of non-absorbent materials and increased surface roughness.
varnish primer treatment When the composite material of paper surface corona treatment should not do, you can consider the surface of the composite paper varnish primer treatment. Varnish primer approach is divided into treatment and off-line connection varnish varnish treatment. Degree of thickness of varnish must be moderate, thick easy to wasteful, too thin is easy to cause trouble printing.
flame treatment Generally applicable to irregular shape of the material.
Actual production is usually a multidisciplinary approach, including corona treatment and varnish primer combination of the most common treatment to good effect. Under normal circumstances, corona treatment infraredink , the rules will be a relatively rough surface, roll formed in the lacquer adhesion relatively large, suitable for UV printing. However, the thickness of the varnish layer control is also very important, too thick or too thin deinking problems may arise. Does not allow copying
(2) the combination of aluminum coating and ink form
When the composite material of paper surface layer of aluminum, there are two situations: one is the aluminum layer with varnish, and the combination of the two more closely, UV ink printed on the varnish on, then it will produce off Mexican phenomenon depends on the aluminum coated with plastic film layer adhesion to Practice has proved that this phenomenon is more common under the deinking; the other is direct contact with aluminum layer and the ink, the printability of paper at this time Compound is good.
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