Production method of EVA (ethylene-vinyl acetate copolymer) glass film
A production method and film technology are applied in the production field of EVA glass film to achieve the effects of ensuring color fastness, reducing impurities and ensuring uniformity of color dispersion.
Inactive Publication Date: 2013-10-09
NANJING SEEKAN INTERLAYER TECH
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Problems solved by technology
[0004] In order to overcome the above-mentioned disadvantages existing in the existing EVA glass film, the purpose of the present invention is to provide a production method of EVA glass film, which can reduce the temperature required for its production, keep the whiteness of the film itself, and effectively reduce the production cost. In the process, impurities such as black spots are generated, so that the performance of the EVA glass film is distributed more uniformly.
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[0009] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0010] As shown in Figure 1, in the production method of EVA glass film of the present invention, EVA raw materials and various auxiliary agents are added to the 75-type parallel twin-screw extruder rotating in the same direction through a quantitative feeding system, and the twin-screws are melted by building blocks. After steps such as shearing, dispersion, and metering, it enters the melt pump for metering, and then enters the T-shaped die to extrude to form a film. On-line scrap recycling is carried out with a recycling device, etc.
[0011] The extruder is the core of the entire casting method, and the present invention replaces the existing single-screw extruder by corotating parallel twin-screw extruders and melt pumps. The co-rotating parallel twin-screw extruder has a great advantage in the dispersion and mixing of additives...
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The invention discloses a production method of an EVA (ethylene-vinyl acetate copolymer) glass film. The production method comprises the steps that: an EVA raw material, various additives and the like are added into a homodromy parallel double-screw extruder through a quantitative adding system, the mixture is melted through two building block type combined screws, sheared, dispersed and metered, then the mixture enters a melt pump to be metered, and finally enters a T-type mould head to be extruded into the film; the film is sized on a cooling sizing device, passes through an automatic on-line monitoring system through a draft gear, and then is reeled and packaged by a reeling device; and finally, scraps are recycled on line with the assistance of a recycling device and the like.
Description
technical field [0001] The invention relates to a processing method of a plastic film, in particular to a production method of an EVA glass film. Background technique [0002] According to different production processes, plastic films include cast film and blown film. The same raw material, due to the different production methods, has a large difference in various properties of the film. The extrusion melt casting method uses a casting film machine to produce films. The casting film is a non-stretching, non-directional flat extrusion film produced by melt casting and quenching. There are single-layer casting and multi-layer co-extrusion. There are two ways of casting. Compared with blown film, it is characterized by fast production speed, high output, and excellent film transparency, gloss, and thickness uniformity. Therefore, extrusion casting film has become one of the main production methods in the plastic film industry. . With the development of society and the conti...
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IPC IPC(8): B29C47/00B29C47/10C08L23/08B29C47/40
Inventor 肖伟武
Owner NANJING SEEKAN INTERLAYER TECH