The inspection of finished iron printing products is mainly an important step to inspect the quality of tinplate box products, and the inspection classification of finished iron printing products of tinplate box includes routine physical and chemical inspection and special requirements inspection.
Square iron box and can
1、 Routine physical and chemical inspection of tinplate box printed iron products
The appearance inspection mainly relies on visual observation, that is, the front and back sides of the iron printing products of tinplate cans shall be free of obvious dirt and wrinkles, the main parts of the printing surface shall be free of obvious scratches, and minor scratches are allowed on the secondary parts. The text lines shall be clear and complete without deformation, the dot shall be clear and complete, the layers shall be clear, the ink color shall be uniform and the hue shall be accurate.
Physical and chemical indexes physical and chemical indexes include: impact strength, adhesion, gloss, whiteness, ink layer surface hardness, cooking resistance, overprint, etc. in addition, sulfur resistance test, acid resistance test, etc.
2、 Special requirements and inspection of tinplate box printed iron products
The special requirements inspection of tinplate finished products refers to the additional inspection in addition to the above routine inspection, which mainly adds some necessary inspection items according to the special needs of tinplate boxes.
For example, when the tin box is printed on the ham can body, the sulfur resistance test and high-temperature sterilization test should be added to the printed iron products; Writing inspection items shall be added when printing writing board products in pickling tank; The inspection items of surface cleanliness should be added to the shell of printing electric rice cooker; When printing candy listening boxes, it is necessary to increase the inspection items of post printing brightness, etc. the selection of iron printing finished products is an inspection work after the iron printing finished products are qualified. In principle, each printed product should be inspected. This visual inspection focuses on the appearance.
Don’t be too troublesome to inspect the finished products of tinplate box printing, and strictly observe the inspection.