Increase in the authenticity rate of aluminum foil packaging and printing products

With the widespread use of aluminum foil packaging and printing products, a question about the authenticity of aluminum foil printing has caused controversy in the printing industry on several occasions.

Most packaging and printing manufacturers choose 0. 001—0.009mm pure aluminum foil as the composite material for printing. For example, most of the printed beer brands choose pure aluminum foil of 0.0115mm. Due to the commonly used 0.007mm aluminum foil, there are about 500-600 tiny pinholes per square meter (the pinhole will disappear when it reaches 0.02mm thick). Although the thickness is different, the tensile strength is almost the same. The moisture permeability (%/M2·24h) is not the same. In order to improve the authenticity of pure aluminum foil packaging printing products, it is necessary to have a certain degree of mechanical properties, but also to maintain a certain degree of flexibility, but the parameters that directly affect the authenticity rate are the strength of aluminum foil. Second, there is a room temperature printing, normal temperature polishing, normal hole punching, embossing and slitting, flattening; die cutting does not fade, does not hurt the knife; trim cutting, packaging and other process problems. Third, after printing, high temperature (150 °C -180 °C), even at 180 °C - 250 °C, without changing the production process, without increasing the normal temperature of the auxiliary equipment, no discoloration, no fading, no fade.

Factors affecting the quality and quality of packaging and printing pure aluminum foil In addition to the factors already mentioned above, die-cutting (that is, the ink film of the printing ink or the oil film of the coating oil after the printing oil is brittle) will cause this - failures occur frequently. . Die cutting does not even neatly damage the knife (the ink film of the printing ink or the oil film of the after-printing oil is too soft). It will also directly cause the adhesion of the aluminum foil to be scrapped.

In order to solve and avoid the problem of scrap caused by the strength of the pure aluminum foil, lateral and longitudinal inspection of the aluminium foil of the drum revealed differences in the strength of the transverse and longitudinal directions. For example, when the strength of the original aluminum foil is horizontal, the breaking force is 15.066, after printing is 15.361, the breaking strength is 1,0044, after printing is 1.024, the deformation rate is 5%, and after printing is 4. 6%; while the vertical breaking force was 15.764, after printing was 16.576; the breaking strength was 1.051, after printing was 1.106; the deformation rate was 3.9999%, and after printing was 4.2 %. Such as embossed aluminum foil strength is transverse tensile breaking force 9.069 (longitudinal 10.25), breaking strength 0.6046 (longitudinal 0.6833), deformation rate of 3.999% (vertical 3.999) , And after pressing different patterns and playing a different number of large and small holes after the breaking force, breaking strength, the strength of the deformation rate is not the same.

According to the range of technical parameters proposed above, this should have clear understanding of the requirements for production processes such as packaging and decoration design, photolithography, printing and slitting, and trademark sticking. In the pursuit of packaging printing quality, the high quality of printing is realized. rate. For consumer users, the horizontal operation method (as the horizontal breaking force is higher than the longitudinal breaking force) can be adopted when labeling to ensure the strength of the aluminum foil printing products. More importantly, it is required that the decorators and photolithographers and printers should always work along the direction of the package printing according to the currently used four kinds of widths: 10-39mm, 39-130mm, 130-220mm, 220-600mm. The cutting and labeling procedures are consistent. In short, increase the quality rate in the reduction of scrap rate and reduce the cost of aluminum foil packaging printing.

In addition to the above-mentioned matters needing attention in the process flow, we can not ignore the embossing (depth of embossing and pressure, punch size, quantity is only a general indicator) equal pressure process.

In the printing, only the strictly used ink type quality, the quality of the varnish type, and the temperature resistance should be based on the product technical parameters of the manufacturer of the ink and the varnish, plus the emphasis on prepress production (at ambient temperature, The actual technical parameters of environmental humidity, thickness, width and printing speed of printed aluminum foil can be used as the basis for batch printing and printing products. Only by strictly controlling the quality of aluminum foil in the packaging printing process can we achieve a genuine rate of 99%. . Otherwise, the low authenticity rate of pure aluminum foil packaging printing cannot be suppressed.
(Text / Liu Jiaju)

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