LCP (Liquid Crystal Polymer) film wrinkle-removing and flattening device and process

Abstract

The invention discloses an LCP (Liquid Crystal Polymer) film wrinkle-removing and flattening device and process. The LCP film wrinkle-removing and flattening device comprises a tensioning mechanism and a flattening mechanism, wherein the tensioning mechanism and the flattening mechanism are arranged between an unwinding roller and a winding roller; the tensioning mechanism comprises a first tensioning roller, a second tensioning roller and a third tensioning roller which are arranged in an up-down staggered mode; the first tensioning roller, the second tensioning roller and the third tensioning roller are fusiform tensioning rollers of which the roller surfaces can be heated, and the diameters of the cross sections are gradually reduced from the middle part to the two ends; the flattening mechanism comprises a first flattening roller and a second flattening roller, wherein the first flattening roller is composed of an upper roller and a lower roller which are matched with each other to press the thin film, and the second flattening roller is arranged between the first flattening roller and the third tensioning roller and presses and conveys the thin film. The LCP film wrinkle-removing and flattening device is suitable for performing wrinkle removing treatment on various types of LCP films, longitudinal and transverse wrinkles of the LCP films can be effectively removed, the wrinkle condition of the treated films is greatly improved, and the films cannot be damaged.

Description

technical field [0001] The invention relates to the technical field of film production and processing, in particular to an LCP film wrinkle-removing and flattening device and process. Background technique [0002] In recent years, with the development of 5G-related industries and the introduction of flexible mobile phones, FCCL (flexible copper clad laminate) and related films have become the focus of attention. At present, the insulating base film of FCCL mostly adopts PI (polyimide) film, PET (polyester) film and PEN (polynaphthyl ester) film. However, PET film and PEN film have poor heat resistance, and PI film is too hygroscopic. This shortcoming may lead to a decrease in the reliability of the final FPC (flexible circuit board) at high temperatures. In addition, with the development of high-frequency signal transmission, higher requirements are placed on the dielectric properties of insulating substrates at high frequencies. LCP (liquid crystal polymer) film has low h...

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Problems solved by technology

However, due to the slight swing of the film bubble during the blow molding process, there will still be wrinkles; on the other hand, the molecular chain segment of the liquid crystal polymer is extremely rigid, so the prepared LCP film is relatively hard and brittle. During the transmission or winding process of the roller, it is easy to cause the film to tear due to uneven tension on both sides

[0005] Chinese patent CN202021848562.9 discloses a flattening device for BOPP film. By blowing the film surface with the airflow generated by the airflow processing component, an arched area is formed on the lower surface of the film, and then the film is flattened by a bow roller, so that the BOPP film can be removed. Wrinkles; but this method is only suitable for soft films, and the wrinkle removal effect is not good for relatively hard liquid crystal polymer films

Chinese patent CN201922332618.9 discloses a copper foil wrinkle removal device. By installing an acoustic wave wrinkle removal mechanism between two parallel guide rollers, the copper foil surface is treated with ultrasonic waves, and tension is applied during its vibration to achieve the effect of wrinkle removal. ; but this method applies a larger tension and has higher requirements on the strength of the material

Chinese patent CN201921629472.8 proposes to use two tensioning rollers with a cylindrical structure in the middle of a truncated cone at both ends. By adjusting the drop between the tensioning rollers, the film is tightened and stretched to both sides, and then smoothed by the leveling roller to wrinkle the film. However, in the actual test, it is found that for LCP film, it is still difficult to remove the dead wrinkles of the film simply by adjusting the tension of the tension roller. If the tension of the tension roller is further increased, it is easy to cause the film to tear

The current film wrinkle removal process is mainly aimed at ordinary plastic films, and LCP film is hard and brittle, and it is prone to some dead wrinkles in the production process, so it is more difficult to remove wrinkles. The existing film wrinkle removal The process is not suitable for LCP film

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