Solvent free composite discussion on selectivity of substrate printing process

1. ink thickness of different printing processes

Flexible packaging printing uses different printing methods, and different printing methods have different ink thickness, different layout and text, different ink layer height. Common printing methods are gravure printing or flexographic printing, and a very small amount of offset printing.

Generally, the ink layer thickness of gravure printing is 2-5 micron (up to 10 micron), flexographic printing is 2-3 micron, offset printing is 1-2 micron.

For printed substrates, the difference between the ink level and the ink level is the key factor to determine the amount of glue needed. Therefore, the gravure printing is more than the flexographic printing and offset printing.

2. Fast adhesive coating and adhesive thickness.

The proportion of KA and KB is only slightly different from that of common glue, basically 1. For example, the specific gravity of a brand glue A and B is (1.12, 0.98), KA and KB are (1.12, 1.02). The coating thickness of 1.0g/m2 is about 1 m, and the thickness of 0.1g/m2 is about 0.1 M.

3.bilateral coating mode is more suitable for flexographic printing and offset printing products.

Relatively speaking, bilateral coating may have doubts about the suitability of certain gravure products (especially those with large difference in ink layer height) and may be more suitable for light film, flexography and offset substrates.

a) indicates the situation before the optical film and printing film are not coated.

b) indicates that the total thickness of the ink layer and the adhesive layer after coating is consistent.

c) indicates that after coating, the thickness of the adhesive layer is uniform regardless of the thickness of the ink layer.

d) the thickness of the adhesive layer varies with the thickness of the ink layer, which is the most common case in practice.

Conclusion: Due to the "one-in-two" effect of double-sided coating, the amount of single-sided coating or the thickness of the coating are actually limited, and the ink layer height difference on the surface of the substrate (i.e. printing process and layout and text) is also objectively restricted.

Therefore, the solvent-free double-sided coating mode of fast-setting adhesive may be more selective or less adaptable to the printing process than conventional adhesive.

Hints: some inferences on fast curing composite membranes:

- When the film is compounded, the amount of glue can be smaller because the ink layer height difference is 0, but the actual proportion of film compounding in packaging is not large.

- The printing film is similar to that of optical film.

- When the text line is combined, although the local ink layer has high difference, the whole film is similar to that of the optical film.

- In the full version of the field printing film composite, the situation is more complex, and the picture and text are very influential.

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