The Experimental Study Of Polypropylene Foam Sheet Surface Coating

With the development of plastic industry, the plastic foamed sheet is being used more and more widely. But plastic foamed sheet itself have some defects and restrict the development of it. Starting from the spray method: At first introduction of several spraying methods,then useing the principle of spray on the polypropylene foamed sheet. With polypropylene foamed sheet for the matrix and metallic powder as spray materials, to change the mechanical properties of the surface of the plastic foamed sheet.Based on thermodynamic Energy conservation and the heat transfer theory .Then design the power of box heater and the set temperature of the box heater. Meanwhile,simulation of temperature in the thickness direction is made of using thermal analysis module in ANSYS software,which validates the rationality of the design of the box heater. The experiment shows that temperature on the plastic foamed sheet surface after heating by box heater can conform the design requirements.According to fluid mechanics theory, established the mathematical model for the spray process of gas fluid in the spray nozzle was established.The new spray nozzles dimensions were designed based on the gas flow fluid in the spray nozzle.Numerical simulation analysis is made of to determine the nozzle cone angle using stress analysis module in ANSYS software.Finally, according to the design, the required spraying device isgiven out and the experiment shows that the new spray nozzle can achieve the ideal effect.Through the experiments of spraying the materials iron and copper powder on the surface of polypropylene foam sheet,by adjusting the extrusion speed, heater temperature setting, injection flow parameters of spraying experiments, determine a parameter and then change the other parameters to acquire an ideal metal coating on the polypropylene foam sheet surface.The mechanics experiments on the surface of the pp show its hardness and strength and wear resistance were increased.In response to the features of the technology plate extrusion molding, design the appropriate heating and spraying devices. Dense metal coating on the plastic plate surface can be acquired by adjusting the extrusion speed, the heating temperature and spraying flow parameters.