How are paper bags produced

Paper bag production has been a major industry for decades, with bags being used for a variety of purposes such as packaging, shopping, and carrying goods.  The production process of paper bags is complex and requires the use of specialized machinery and skilled...

Four-color printing in the printing process

The four-color printing process of color boxes is based on the mixing rule of subtractive color method, which uses yellow, magenta and green primary colors plus black ink for printing. With the development of printing machinery and production technology, color...