The Material Composition And Production Process Of Light Box Cloth（PVC Flex Banner）
The light box cloth is outdoor spray painting advertising materials, mainly used in advertising light boxes, banners, large posters, construction sites outside the wall scenery, and large T-shaped billboards. Light box cloth spray painting using oil-based ink, sun, and rain is not easy to lose color, durable, which is also its biggest characteristic different from indoor photo advertising materials. Light box cloth spray painting using oil-based ink, sun, and rain is not easy to lose color, durable, which is also its biggest characteristic different from indoor photo advertising materials.
The first part is the surface layer of PVC film, adsorption ink; the second part is polyester warp knitting base cloth, which enhances the tear strength of the light box cloth; the second part is the bottom layer of PVC film, through the lamination with the surface layer of PVC film, so that the three parts of the light box cloth closely together. To save costs, PVC film is made relatively thin, especially the bottom PVC film because it does not affect the performance of airbrushing, usually made very thin, thus causing the surface of the light box cloth and the bottom surface not very flat. Although through various technical means, the surface of the light box cloth is made very flat, the bottom surface is still not very flat, and after the roll, will still affect the surface.
In addition, due to the different thicknesses of the surface PVC film and the bottom PVC film, in the state of natural hanging or no tension on the left and right sides, the light box cloth is easy to roll the edge, affecting the visual effect. When using light box cloth to do internal light box, the existing base cloth will reduce the light transmission rate, which will also affect the visual effect. Therefore, ordinary light box cloth can not meet the user’s need for high transmittance, not rolled edge spray painting supplies. Although there are backlit sheets in the market, their width is basically below 1.52 meters, and the cost is higher due to the special process.
Light box cloth according to the production process is divided into three kinds, respectively, knife scraping method light box cloth, calendering method light box cloth and paste law light box cloth. The knife scraping method light box cloth process is the liquid PVC slurry with several reverse scrapers evenly coated on the front and back of the base cloth, and then through the drying process to make it completely combined into one, after cooling molding. It is characterized by strong anti-permeability, tensile strength, and peel resistance. However, due to the complicated production process and expensive production equipment, the product price is relatively high. The calendering method is to fully mix PVC powder with a liquid plasticizer and many other raw materials, and then bond it to the base fabric into a whole by the pressure of high temperature and heat. Its characteristics are better surface flatness and uniform light transmission, but due to the limitations of the equipment, the width is generally not more than 3 meters.
The legal light box cloth is the upper and lower two layers of forming PVC film, through heating, the pressure of the hot roller rains in the middle of the light guide fiber network laminated together, cooling molding. Its biggest feature is that it has excellent ink-jet absorption and strong color expressiveness. However, due to its long-term placement outdoors, in the wind, heat, rain, and ultraviolet radiation under the joint action of easy to appear PVC film material aging, brittle damage, and other phenomena.