Extrusion stretching type pre-coating film and preparation method thereof

Abstract

The invention provides an extrusion stretching type pre-coating film and a preparation method thereof. The pre-coating film sequentially consists of a functional layer, a core layer, a bonding layer and a hot melting glue layer from top to bottom, wherein the functional layer material is made of adhesive polypropylene masterbatch and a film-level homo-polypropylene; the core layer material is film-level homo-polypropylene; the bonding layer material is ethylene-methyl acrylate copolymer; the hot melting glue layer material is prepared from antioxidants and ethyl-vinyl acetate polymers. The extrusion stretching type pre-coating film is prepared by using a bidirectional stretching process and the coating by using a bottom sizing agent is eliminated, so that the process is simplified, and the mechanical strength and the stripping degree of the prepared pre-coating film are further improved, and the pre-coating film is more environmental friendly.

Description

Technical field:

[0001] The invention relates to the technical field of printing films, in particular to an extruded stretched precoated film and a preparation method thereof. technical background:

[0002] Since the birth of film coating technology, film coating technology has experienced three important development stages: solvent-based instant coating technology, water-based instant coating technology, and pre-coating film technology. Among them, the solvent-based ready-to-coat technology has many disadvantages. Because the adhesive used in it contains benzene solvents, it is harmful to the human body and the environment; and it needs to be dried and matured during lamination, which consumes a lot of energy and has low efficiency. The water-based ready-to-coat technology has problems such as low efficiency, low composite fastness, and poor quality stability, which are also restricted in use. Pre-coating film technology is a new type of film coating technology develop...