A kind of thermoplastic polyurethane fine slit screen and its forming method

Abstract

The invention discloses a thermoplastic polyurethane fine mesh screen. The thermoplastic polyurethane fine mesh screen comprises a screen body, a plurality of small screen pieces, rectangular rib strips, triangular rib strips, transverse screen borders and longitudinal screen borders. The small screen pieces are arranged in parallel to form the screen body. The screen body is fixedly arranged in a screen frame defined by the transverse screen borders and the longitudinal screen borders. Each rectangular rib strip is connected between every two adjacent small screen pieces. The thickness of the rectangular rib strips is equal to that of the small screen pieces. The small screen pieces are composed of rectangular net areas, big transverse rib strips, big longitudinal rib strips and small longitudinal rib strips. The big transverse rib strips and the big longitudinal rib strips or the small longitudinal rib strips are intersected to form the rectangular net areas on the small screen pieces. The thermoplastic polyurethane fine mesh screen has the characteristics that the thermoplastic polyurethane fine mesh screen is high in porosity, long in service life, not prone to hole blockage, low in investment, simple in forming process, short in forming time, high in forming efficiency and high in finished product rate, and the phenomenon that holes of the screen are not through cannot occur.

Description

technical field [0001] The invention relates to a screen, in particular to a thermoplastic polyurethane fine slit screen and a forming method thereof. Background technique [0002] Traditional fine screens generally use metal woven screens or injection molded nylon screens, which have low porosity, poor wear resistance and corrosion resistance, short service life, and frequent replacement, so the labor intensity is high and the cost is high. With the continuous improvement of non-metallic materials and the continuous improvement of injection molding equipment, in order to overcome the shortcomings of traditional fine screens, thermoplastic polyurethane fine slotted screens were born. [0003] The thermoplastic polyurethane fine slit screen has the following characteristics: 1. Excellent wear resistance, the service life of the thermoplastic polyurethane fine slit screen in the ferrous metal screening industry is more than 10 times that of the traditional screen; 2. High por...

AI Technical Summary

Problems solved by technology

[0004] At present, the polyurethane screens appearing in the domestic market are formed by integral casting. The process is roughly divided into vacuumizing the mold, injecting the castable into the mold under normal pressure or pressure, keeping the mold warm and pressure-keeping, and curing for a certain period of time. Forming the screen, this forming method requires a very large heat preservation and pressure maintaining equipment, a complex vacuum system, a huge mold and a considerable number of mold arrays. In short, the investment is extremely expensive. If the size of the screen is too large (long Width up to 1000mm or more) This kind of equipment and mold is almost impossible to realize at the current manufacturing level

At the same time, due to technological problems, the forming time needs to be more than 1 hour, and the forming rate of the screen is low; because it is formed under high temperature and high pressure, the energy consumption is huge

At the same time, the screen formed by this forming method is difficult to mold, and the screen hole in some areas is prone to impermeability, and the yield is low, which affects the appearance and use effect of the product.

Images