Air box system unit of film transverse stretching drying box

Abstract

An air box system unit of a film transverse stretching drying box comprises a drying box body; four sets of long-strip-shaped air boxes are arranged in the drying box body; a transverse air inlet pipe which stretches transversely is arranged above each group of air boxes; the left end and the right end of each transverse air inlet pipe are connected with vertical air inlet pipes correspondingly; an air volume distributor is arranged at the transverse center position of each transverse air inlet pipe; the pipe wall of the transverse air inlet pipe above the air volume distributor is hollowed out to form an air inlet of the transverse air inlet pipe; in each group of air boxes, a lower recovery air pipe which stretches transversely is arranged below the lower air box and an upper recovery air pipe which stretches transversely is arranged above the upper air box; each group of air boxes is correspondingly matched with a vertical total recovery air pipe; an air treatment chamber is also provided and is divided into an air inlet cavity, an air return cavity and a heating cavity on the horizontal section; and the air inlet cavity, the air return cavity and the heating cavity are combined to form a rectangle on the horizontal section. The air box system unit of the film transverse stretching drying box enables the transverse stretching quality and the stretching proportion of the film to be uniform and the structure to be compact.

Description

technical field [0001] The invention belongs to the technical field of film production equipment, and in particular relates to a bellows system unit of a film transverse stretching oven. Background technique [0002] After the film is produced, it needs to be stretched, and the stretching includes transverse stretching and longitudinal cross-body. In the process of transverse stretching, the film needs to be heated by hot air. Therefore, there are multiple bellows system units in the oven. Each bellows system unit is equipped with several sets of bellows. The length of the bellows is arranged along the horizontal direction. Every two sets of bellows It is formed into a group, and two sets of bellows in each group are arranged up and down. The bellows located below are called the lower bellows, and the bellows located above are called the upper bellows. The bottom is provided with an air outlet facing downward; [0003] Each bellows system unit is also equipped with an air ...

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Problems solved by technology

[0005] 1. The wide width of the film means that the power required to heat the air is relatively large, the temperature required by the electric heating element of the air treatment chamber is relatively high, and the temperature of the air treatment chamber is correspondingly high; the air treatment chamber of the existing bellows system unit The surface area of ​​the chamber in contact with the outside world is large, resulting in more heat loss. In addition, due to the strong thermal radiation of the electric heating element to the film, the heating of various parts of the film in the transverse direction is uneven;

[0006] 2. The wind pressure on the left and right sides of each set of bellows is not easy to control and evenly, so that the heating degree at both ends of the film is quite different, which affects the stretching effect and stretching quality; on the other hand, the film with a width of nearly 10 meters is located in the oven. At the same time, in addition to being clamped at the left and right ends, there is no fixed component support in the middle of the 10-meter-long span, only relying on airflow support, so if the airflow of the air outlet is unstable and uneven, it will lead to unstable membrane support. Unevenness, which in turn causes uneven up and down jitter in various parts of the film, affecting the quality and effect of stretching

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