摘要:
It is proposed a process for manufacturing a diesel tank or filler pipe by means of an extrusion-blow moulding machine suitable for manufacturing a gasoline tank or filler pipe. The extrusion-blow moulding machine is equipped with a coextrusion head (1) comprising at least one extruder being configured to provide during a first period of time a first material that is a barrier to liquids and/or gases, such that during the first period of time the coextrusion head produces a first multilayer parison from which the gasoline tank or filler pipe can be manufactured. The extruder is such that it is further configured to provide during a second period of time a second material distinct from the first material, such that during the second period of time the coextrusion head produces a second multilayer parison from which the diesel tank or filler pipe can be manufactured.
摘要:
The invention relates to the design of a multilayer reinforced polymeric pipe for water, namely, hot water in central heating and water supply systems, and may be used in pipes for transportation of liquid and gaseous media to which the pipe material is resistant in operation conditions. The multilayer reinforced polymeric pipe comprises a polymeric base layer, at least one barrier layer, at least one reinforcing layer, an adhesive layer and a protective layer. The adhesive layer is made from a material which does not adhere to the material of the reinforcing layer and forms channels for the free movement of the fibers of the reinforcing layer. The base polymeric layer of the proposed pipe is made of cross-linked or heat-resistant polymer, preferably polyethylene or polybutene. The reinforcing layer may be made in the form of a mesh. The reinforcing layer is made of high-strength and high-modular polymeric fibers, preferably aramid, polyester, or polyethylene fibers. The barrier layer is made of polar and nonpolar polymers. The protective layer is made of polyethylene of medium density. Thickness of the protective layer is at least 3 mm. A system of pipes for transportation of water, preferably hot water in central heating and water supply networks, consisting of two or more multilayer reinforced polymeric pipes. The technical result consists in allowing the axial displacement of the reinforcing fibers inside the pipe structure under the effect of cyclic changes in temperature and mechanical load while maintaining the mesh structure and preventing damage to the polymeric layers of the pipe, which surround the reinforcing layer.
摘要:
The invention relates to a method of assembling multilayer plastic strips by means of IR laser radiation soldering, said strips comprising an oriented radiation-transparent layer and a radiation-absorbing layer. The aforementioned strips are soldered to a preformed plastic support using the same technique. The invention also relates to the composite tube which is produced by soldering said strips to a plastic core.
摘要:
The invention concerns a plastic pipe particularly fire-resistant, such that its wall is formed with a ringed tube (1) made of inflammable plastic material, with a smooth tube (2) externally sheathing the ringed tube and produced in plastic material limiting flame propagation and with a fireproof composition inserted between the two tubes.