Composite film capable of positioning internally-printed variable codes and preparing method of composite film

Abstract

The invention provides a composite film capable of positioning internally-printed variable codes and a preparing method of the composite film. The method comprises the steps that a printing layer is subjected to corona treatment, printed with oil ink and then subjected to corona removing treatment, then variable code jet printing and hot sealing layer combination are carried out in sequence, curing treatment is carried out, and the composite film can be obtained. According to the preparing method, the printing layer is subjected to corona treatment before a pattern layer is formed, so that the adhesive force of the printing layer to liposoluble intaglio printing oil ink is improved; then, the printing layer is subjected to corona removing treatment before an anti-fake layer is formed, so that the surface tension of the printing layer is reduced, and the adhesive force of the printing layer to UV oil ink is improved; meanwhile, the static amount, increased due to corona treatment, of the printing layer material can be transferred, so that the defect of static deckle edges and even fuzziness caused by directly printing anti-fake codes on an oil ink pattern layer in a jetting mode in the prior art is effectively overcome, and thus the use effect of anti-fake codes is greatly improved.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a composite film with a variable code printed on the inside of the positioning and a preparation method thereof. Background technique [0002] As a protective body for the contents, the packaging bag plays the role of holding items, sealing items and identifying items. Among them, the function of marking items is mainly manifested in: pattern design on the surface of the packaging bag, bag shape and identification code. The identification code can be text, graphics, images, barcodes, two-dimensional codes, product line numbers, etc. Taking the biscuit packaging bag as an example, the conventional biscuit packaging bag adopts a two-layer composite structure of biaxially oriented polypropylene (BOPP) film and cast polypropylene (CPP) film. Layer BOPP serves to provide strength as well as serve as a substrate for ink printing. Manufacturers of the above-mentioned composite film ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of blurred anti-counterfeiting codes and poor low-temperature heat-sealability of the inner layer of the packaging bag in the existing composite film packaging bags containing anti-counterfeiting codes, and further provide a kind of anti-counterfeiting code with clear and heat-resistant Composite film with good low-temperature heat-sealability and strong anti-pollution ability of sealing layer and variable code printed on the inside and preparation method thereof