Double-sided quality detection method for tinplate

Abstract

The invention relates to the technical field of quality detection of tinplate. The invention aims at providing a double-sided quality detection method for tinplate, which has high efficiency and can prevent miss-detection. The invention adopts the technical scheme that the double-sided quality detection method for tinplate comprises the following steps: a, printing of two-dimensional codes: printing a two-dimensional code in every image-text period on the outer surface of the tinplate in the process of printing the tinplate by a plate-printing machine; b, removal of contamination: blowing off contamination from the inner surface and outer surface of the tinplate by using two high-pressure air rifles which are respectively positioned above and below the delivering surface of a conveying device of the discharge end of the plate-printing machine; c, image shooting; and d, processing of image information. The double-sided quality detection method for tinplate reduces the possibility of miss-detection, is convenient for reconstructing used equipment, and also reduces the data processing quantity of an industrial personal computer and energy consumption of a first industrial camera and a second industrial camera.

Description

technical field [0001] The invention belongs to the technical field of tinplate quality detection, and in particular relates to a double-sided quality detection method of tinplate. Background technique [0002] Iron printing is to print patterns on tinplate (tin plate). It mainly uses the physical properties of water and ink to repel each other, and with the help of printing pressure, the graphic on the printing plate is transferred to the tinplate through the blanket, which belongs to the principle of lithographic offset printing. Since the graphic part printed on the tinplate is located on the outer surface of the tinplate, once there are defects such as flying ink, knife wire, color difference, and missing printing on the outer surface of the tinplate, it will greatly affect the appearance of the product, while the inner surface of the tinplate is due to the manufacturing process. After being made into a tinplate can, it is in direct contact with the contents of the can....

AI Technical Summary

Problems solved by technology

[0004] However, there are still relatively large defects in this detection method. Since the detection is generally carried out in the production workshop, the dust and impurities in the production workshop fall behind the surface of the tinplate. It is transmitted to information processing equipment such as industrial computers and computers, but the information processing equipment cannot distinguish the defects in the image

That is to say, even if the defects on the surface of the tinplate are only repairable defects such as impurities, they will still be judged as unqualified products, which will cause huge losses.

At the same time, since the outermost layer of tinplate is a varnish layer after printing, and because the varnish layer is transparent, the existing detection methods cannot effectively detect whether the varnish layer is damaged