The principle of film blowing is a plastic processing technology that heats and melts plastic particles and then blows them into a film.
Plastic melting and plasticization
Plastic particles are fed into the screw extruder of the film blowing machine. After heating and shearing, the plastic particles are melted and plasticized.
Extrusion into a tube
The molten plastic is extruded through the porous plate or annular die hole in the mold to form a tubular film blank. At this time, the melt is in a good flow state.
Blowing molding
High-pressure air is introduced into the tubular film blank to blow it to the required thickness. In this process, the melt is subjected to the dual effects of stretching and blowing to form a film.
Cooling and shaping
The blown film passes through a cooling device, such as a cooling air ring or a cooling roller, to quickly cool it and shape it. During the cooling process, the molecular chains of the film are fixed to form a stable structure.
Reeling and cutting
The shaped film is reeled into a roll through a traction device, and then cut and packaged as needed.
The film blowing machine can process plastic particles into film products of various specifications and sizes. These film products have a wide range of applications, such as food packaging, medical supplies packaging, agricultural covering film, etc.
