| Tubular product is one of the important engineering materials. Plastic tubular is widely used in the all kinds of engineering because of its good properties of fluidic current, corrosion-proof, installing facility ect. And because the plastic tubular is different in the matrix materials, aided materials, molding technology, the facility of molding and the purpose of the application , the plastic tubular is formed into the product hierarchy in which the kinds of plastic tubular are multiply, the performances of plastic tubular are diversity and the price of plastic tubular are different . In order to develop the kinds of plastic tubular whose mechanical property is very good, whose molding technology is comparatively simple and which is cheap In this paper, the technology is brought forward and studied which is applied to extrusion the long fiber-glass reinforced plastics tubular and the online mixing with long fiber-glass. The follow works have been finished:1. In term of macroscopy views, microscopy view and the experimental data of glass-fiber reinforced plastics, the elastic ratio and intensity of the reinforced plastic are deduced, the microscopy mechanical property of the sticky point of the fiber and base body is also deduced. Impact failure, the mechanics shear failure and stress feature of the glass-fiber reinforced thermoplastics are analyzed.2. On the basis of analyzing the molding process of the general plastic tubular and all kinds of die, the feature of the intensity of the plastic tubular is analyzed , On the other words, the effect on the intensity by orientation of molecule and the distribution of radial stress, circle stress and axial stress of tubular as the result of inner pressure, the conclusion is made that the intensity of plastic pressure tubular lied on the circle intensity, so circle intensity must bereinforced to increase the intensity of tubular.3. Two new kinds of die are designed and get the national patent. The dies are put use into the extrusion the plastic tubular online mixing with long fiber-glass .The feature of the dies are flowing: the die is installed in the present general extruder; general polymer granule is used in the extrusion process; after melting the polymer granule into plastic fluid, fiber-glass in a length is mixed online into the plastic fluid; making the fluid molecule and fiber-glass helical orientation along the tube wall of the extrusion circle tubular product. So the higher strength tubular is produced to meet the needs of practical engineering.4. On the basis of analyzing of the Poiseuille flow and Couette flow , the resolution expression of helical velocity of the mixture flow in the dies is deduced .The dies with revolving mandral are used to the extrusion the plastic tubular online mixing with long glass-fiber. Then the expression as Power law flow, with the numerical value of partial differential way, the curves of velocity field of examples is given.5. On the basis of the set up the flow expression of the melt in die, the expression is analyzed with the whole numerical simulation algorithm. And the flow in the two new kinds of die is calculated with analogy method with ANSYS. The states of velocity vector quantity on the several key sections are deduced . So the design of the two new kinds of die is proved to be practical in the essence and that provides the data basis for development of solid mass.6. On the basis of analyzing of the technology process of fiber reinforced thermoplastics, the special technology of long-fiber online mixing is researched. Especially, the way to deal with the coupling agent and the mixture mechanics of plastics melt and glass-fiber in the die are researched.
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