Determination of Design and Process Parameters for Winding Sealed Fuel Lines from a Polymer Film
The purpose of the study is to evaluate the tightness of fuel lines made of film materials using the winding technology applied to gaseous and liquid components of fuels. The objectives are to determine design and process parameters for winding film fuel lines made of polymer polyimide film with a double-sided fluoroplastic coating (PMF-352), which ensure the required level of tightness. The tightness of the shell of a polymer fuel line is determined by both the physicochemical parameters of the film material and the structural and technological parameters of the winding casing. Taking into account the peculiarities of forming thin-walled products from polymeric materials, a multilayer film structure made by winding a narrow polymer tape can be used as a design model of the sealing shell of a fuel line. The model consists of n layers wound with a constant overlap ∆b. It is necessary to determine the dependence of the gas permeability on the design and process parameters (∆b, b, hpl, hcl, n), which make it possible to manufacture the shell with the minimum mass and the required tightness. The article presents a model of a new design and technological solution for molding straight and curved fuel lines from polymer film materials, which ensures the required level of their tightness while maintaining the required bearing capacity. Computational and experimental methods based on the experience of using polyimide-fluoroplastic film PMF-352.8 were used in the research. Experimental studies have shown that the application of the results obtained ensures the tightness of the fuel line for helium 5×10-3 l×m Hg / s ≈ 5×10-7 W, as well as reduce the mass of the fuel lines by 20...30 %.