Side-thickened polyamic acid film, tape casting equipment and preparation method thereof

Abstract

The invention discloses a side-thickened polyamic acid film, tape casting equipment and a preparation method thereof, and belongs to the field of film preparation. The two lateral side parts of the film gradually increase with the thickness close to the outer edge within an X-wide range, X is 20-200 mm, and the thickness distribution of the film is symmetrical relative to the longitudinal central line of the film. The openness of a lip within a Y length range at the two side parts of a forming mold lip of the tape casting equipment gradually increases with the openness close to the outer edge, and the openness of the lip is symmetrical relative to the longitudinal central line of the lip. The preparation method comprises adjusting the bolt of the forming mold lip to obtain the necessary forming mold lip. According to the invention, since the thicknesses of the two side parts of the film are increased, the strength is increased, the strength of the film at an acting point of a clamping device in a subsequent procedure is increased to avoid unclamping or releasing or edge damage caused by clamping damage and pull damage, so that the product yield is greatly improved; the tape casting equipment and the preparation method disclosed by the invention are easy to achieve, and only the lip bolt is adjusted to increase the openness at the two sides of the lip.

Description

technical field [0001] The invention relates to a polyimide film preparation technology, in particular to a side-thickened polyamic acid film, salivating equipment and a preparation method thereof. Background technique [0002] Polyimide film is a polymer material with excellent properties such as high strength, high toughness, wear resistance, high temperature resistance, and corrosion resistance. It is the main insulating material for making various medium and high-end electrical and electronic components, and is widely used in electrical and electronic industry. At present, the preparation process of polyimide film is to use polyamic acid resin solution as raw material, and salivate on a salivating machine to obtain a self-supporting polyamic acid film, and then undergo heating stretching, high temperature imidization, cooling and shaping to obtain a polyimide film. amine film. [0003] With the design requirements of light, thin, short, small and high reliability of do...

AI Technical Summary

Problems solved by technology

The high temperature encountered in the double-layer side clamping process makes the film at the clamping position of the chain clip easy to tear, which also leads to the abnormal winding of the product and reduces the yield of the film product.

[0008] In the actual production line, the clip opening position of the polyimide film is close to the traction and winding device. When the clip is opened, the film is subject to the comprehensive effects of tensile stress, traction tension and winding tension, which are prone to cracking, transverse fracture and other film rupture phenomena, resulting in The film cannot be wound normally, seriously affecting the film yield and reducing the film output

[0009] In order to solve the problems of broken edges and film breaks during the preparation of polyimide films, related patent applications have appeared in recent years, such as the Chinese utility model patent "Clamp-in guide device for film production equipment" with the announcement number CN202245464U, and the publication number is The Chinese invention patent of CN102441987A "chain clip cooling device for film production machinery", the Chinese invention patent of CN102431161A "advance clip opening device of film production line", the Chinese invention patent of CN102390112A "film stretching setting or tensioning Film clamping device for sizing equipment", the Chinese utility model patent with the notification number CN203236699U "a system for solving film stretching and uniform thickness", which discloses the guide device for entering the clip, the cooling device for the chain clip, and the clip opening in advance Although the clamping device and the clamping device have reduced the problem of pinching or tearing the side of the film, it has not completely eliminated such failures.

Moreover, these devices all need to modify or replace the existing production line equipment. The device structure is relatively complicated and requires high modification costs, so it is difficult to implement widely.

[0010] In addition, the Chinese invention patent with the publication number CN102416684A "Method for Disposal of Adhesive Tapes Produced by Salivating Machine Films", the Chinese Invention Patent with publication number CN102303388A "Treatment Method for Adhesive Tapes Produced by Salivating Machine Films", and the Chinese Utility Model Patent "Automatic Tape Production" with the publication number CN202147343U The "polyimide film production device for wiping release agent" etc. is to improve the manufacturing process to deal with abnormalities such as film rupture and film breakage caused by drool adhesive tape. There are many adjustment process parameters and a large adjustment range, especially the introduction of such as wiping release agent It will cause the film to be too smooth and cannot be normally applied to downstream products, such as side effects

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