Shaping device of plastic thin film production equipment and plastic thin film shaping method

Abstract

The invention discloses a shaping device of plastic thin film production equipment. The shaping device comprises a heating box and a cooling device, wherein side walls on the two sides of the heating box are formed by engaging and splicing a front part and a rear part respectively; the splicing part of the front part and the rear part of the side wall on each side is tooth-shaped; the front half parts of the side walls on the two sides are integrally connected with a front wall to form a front unit; the rear half parts of the side walls on the two sides are integrally connected with a rear wall to form a rear unit; a driving mechanism for driving the front unit or the rear unit to move back and forth along a track is also provided; the front unit and the rear unit of the heating box are provided with a plurality of horizontal metal rollers respectively; and the metal rollers of the front unit and the rear unit are vertically arranged at intervals. The invention also provides a plastic thin film shaping method. Through the device and the method, a plastic thin film can be heated in a relatively sealed space and continuously bent and wound through the plurality of metal rollers in the space, so the shaping quality of the plastic thin film is improved.

Description

technical field [0001] The invention belongs to the technical field of plastic film production, and in particular relates to a shaping device of plastic film production equipment and a plastic film shaping method. Background technique [0002] During the production process of plastic film, the molten plastic melt is extruded from the mold to form a plastic film (a film bubble is formed when it is extruded from the mold of the blow molding machine, and the film bubble is further inflated to form a film), and the film is solidified after cooling. Finally, it is wound up by a winding shaft. In order to further improve the quality of the plastic film, make the shrinkage rate of the plastic film more stable and the surface smoother, after the film is cooled and solidified, and before winding, the plastic film must be heated by a shaping device, and then cooled after heating. The above heating and then cooling process is called the setting process; in the setting process, the str...

AI Technical Summary

Problems solved by technology

[0005] The first one is in the form of an oven. Although there are many metal rollers in the oven, these metal rollers are all at the same horizontal position. When working, the plastic film passes over each metal roller, which is equivalent to the thickness of the film. Standing on the metal roller, this measure has the following disadvantages: 1. From a geometric point of view, the surface of the metal roller and the surface of the plastic film form a tangent geometric relationship, so the bonding surface between the metal roller and the plastic film is extremely small , the close contact is not close, and it is difficult for the metal roller to transfer heat to the plastic film. The plastic film needs to go through a long stroke to be heated to the required temperature. Compared with the main machine of the film machine, the temporary space for the setting device is much larger; 2. It is difficult for the surface of the metal roller in the oven to form pressure and tension on the film, and it is impossible to use the smooth surface of the metal roller to affect the surface of the film under heat. For trimming, besides, the metal roller can only touch one side of the plastic film, and cannot touch the two sides of the plastic film; in addition, it is not conducive to controlling the tension of the plastic film;

There are also disadvantages in this form: 1. As mentioned above, the shaping device cannot use multiple heat-conducting rollers, but only one to two heat-conducting rollers. Due to the small number of heat-conducting rollers and the short and rapid heating time, the setting effect is poor, and In order to heat the plastic film to a certain temperature, it is also required that the temperature of the heat conduction roller is very high, so it is easy to burn the film. If you want to reduce the temperature of the heat conduction roller, the heating effect will be weakened and the shaping effect will be affected; 2. The heating device is not sealed, The energy consumption of heating is relatively large, which has a great influence on the temperature of the production workshop

[0008] However, no matter which of the above two forms, neither can have the advantages of both at the same time.

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