PE protective film production process

The first is blown film: in the heated drum, polyethylene particles are pushed by the screw into the round die head mouth, compressed air will blow the molten liquid, through the air-cooled, wound into a film. Blown film transverse and longitudinal nature is not the same, the machine direction of PE protective film elongation is generally greater than 180%, transverse elongation is generally greater than 380%. But the size of the elongation and mechanical strength is inversely proportional to the elongation is too large (such as greater than 500%), the mechanical strength of the film will often be very low, easy to cause the PE protective film in the process of transportation, handling breakage, and in the deconvolution of the protective film is easy to be elongated in the cut plate, the protective film will be rebound, warping.

Next is the coating of the colloid: corona over the film can be directly coated with polyacrylate adhesive, no need to apply primer. PE protective film then passes through a long air heating channel (80 ~ 120°C) to ensure that water or solvents are evaporated, followed by cooling of the film by cooling rollers, and finally winding.  

Finally, rewinding, slitting and storage: the protective film is rewound directly on the coating machine to the length required by the customer. If the customer needs PE protective film to have a nice appearance without air bubbles, the film can be rewound with a high quality rewinder to make sure that there is no air in the film. For short lengths (less than 500 meters), PE protective film can be slit with a straight knife. More than 500 meters, the heat generated when slitting with a straight knife may melt the polyethylene, resulting in difficult to unwind, or even unwind torn film. According to the coated online understanding, the protective film can generally be stored in the room temperature of 30 ℃, no direct sunlight in the warehouse for 12 months, the higher the temperature, the shorter the storage period, every 10 ℃ higher, the storage period will be reduced by half.