What are the advantages and applications of BOPP film
Advantages of BOPP film:
The surface energy of BOPP film is low, and corona treatment is required before gluing or printing. After corona treatment, BOPP film has good printing adaptability, and can be overprinted to obtain beautiful appearance effect, so it is often used as the surface material of composite film.
Disadvantages of BOPP film:
BOPP film also has shortcomings, such as easy to accumulate static electricity, no heat sealing, etc. In the high-speed production line, BOPP film is easy to generate static electricity, so it is necessary to install static electricity remover. In order to obtain the heat-sealable BOPP film, the heat-sealable resin glue, such as PVDC latex, EVA latex, etc., can be coated after the surface of the BOPP film is corona treated, and the solvent adhesive can also be coated. The heat-sealable BOPP film can also be produced by extrusion coating or co-extrusion composite method.
BOPP film is widely used in the cover packaging of bread, clothing, footwear, cigarettes and books. The initial tear strength of BOPP film is improved after stretching, but the secondary tear strength is very low. Therefore, no notch can be left on both ends of BOPP film, otherwise BOPP film is easy to tear when printing and laminating. After BOPP is coated with self-adhesive adhesive, box sealing adhesive tape can be produced, which is a market with a large amount of BOPP.
That is, the common point of blistering and film stripping of the film-coated products processed by the gluing wet composite process is that the film breaks away from the substrate of paper and printing, and damages the compactness and smoothness of the paper/plastic composite.
To improve the wear resistance of biaxially oriented polypropylene membrane (BOPP membrane), a novel polypropylene surface modification coating with good transparency and wear resistance was prepared by sol-gel method, using silane coupling agent (KH550), aluminum sec butanol (ASB) and ethyl orthosilicate (TEOS) as precursors, solid acid (p-toluene sulfonic acid) as catalyst
The printing and film are combined by professional laminating equipment to form a paper-plastic product. This technology is called lamination. The surface of the printed matter coated with film is brighter and smoother, the pattern is more bright, and the performance of wear resistance, folding resistance, tensile resistance, moisture resistance, chemical corrosion resistance and other properties are also enhanced. Even some apparent defects in the printing process can be largely compensated. Therefore, not only the service life is extended, but also the beauty of the product is greatly improved. Since the film coating technology was born in the 1950s, the film coating technology has experienced three important development stages:solvent-based coating technology, water-soluble coating technology, and precoating technology.
Precoating film refers to the process of laminating plastic film with paper print after pre-gluing and rewinding. The precoating film structure is composed of substrate and adhesive layer. According to different substrates, the precoating film can be divided into BOPP precoating film, BOPET precoating film and BOPA precoating film. The adhesive layer is mainly EVA hot melt adhesive and LDPE hot melt adhesive. Downstream mainly applies to the packaging of books, food, medicine, daily necessities and other products in the field of industrial printing, digital printing, card certification, anti-counterfeiting, commercial advertising and construction materials in the special products market in the field of commercial printing.