Discussion on the market development prospect of BOPP film
BOPP film is a kind of film made of polymer polypropylene melt through a narrow and long die into sheet or thick film, and then stretched in two vertical directions (longitudinal and transverse) at a certain temperature and a set speed in a special stretcher at the same time or step by step, and through appropriate cooling or heat treatment or special processing (such as corona, coating, etc.). BOPP film is colorless, odorless, tasteless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency.
After more than 20 years of development in China, the BOPP film industry has become increasingly mature in technology and has formed a certain scale in industry. In recent years, with the intensification of market competition, some enterprises with strong financial strength, rich marketing experience and deep technical reserves will actively transform and tend to produce differentiated products that meet customer needs, such as smoke film, laser base film, BOPP kink film, matting film and paper composite film products. These differentiated products are mainly used in cigarette, food, textile and other packaging segments with broad development space. The continuous development of the terminal market will drive the continuous growth of BOPP film industry.
At present, China's plastic film industry is walking on a thriving and booming road. The demand for plastic film in China is growing at a rate of nearly 10% every year. Various new technologies, new products and new equipment are emerging. One bag one code technology, digital printing technology, ultra-high barrier film, laser aluminized film, factory automated intelligent manufacturing system and other technologies have ignited the industry, and there have been many successful cases, These trends will promote the development of plastic film in China towards functionalization, specialization, differential customization and intelligence.
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.