Nearly ten years, continuous fiber reinforced thermoplastic pipeline (Reinforced Thermoplastic Pipes) is the research direction of international pipeline field hot topic always, because it has obviously advantage, the high strength of fiber can be played, bear high pressure, pliability that thermoplastic is good and corrosion resistance can be kept again, have wide market in high-voltage tube application aspect such as oil feed pipe, fuel tube, supplying drainages.
Traditional RTP divides three-decker, and namely inside and outside is extrusioning thermoplastic plastic's pipe, and centre is fiber-reinforced layer or steel wire reinforcement layer.The method adopted is pipe in first extruded thermoplastic, then is wound around enhancement layer on inner pipe, finally extrudes outer surface protective layer.As described in patent document CN103878990A, the product anti-pressure ability that this method is produced is high, Security is good, but this production line is very long, generally need the long left and right of 80M, thick pipe is strengthened for multilayer and even wants more than 100M, due to higher to fusion technology requirement of heating between layers, control bad, easily there are quality problems, at present, ripe European production line approximately needs 2000-3000 ten thousand RMB, domestic production line is also in development, estimate also to need more than 1,000 ten thousand RMB, this high cost investment, inefficient production hinders the application of RTP.Although the method described in patent document CN102363363A is simple, the online impregnation technology of fiber is also not by far up to the mark at present, and the online impregnation of fiber is difficult to soak into, and the product micro gas-bubble produced is too many, can not use as anti-high-voltage product.As fruit fiber adopts braid pattern to strengthen, the party's rule is at all unworkable.
[summary of the invention]
The object of the invention is the defect in order to overcome traditional production glass fiber reinforcement thermoplastic pipe, according to the know-why of thermosetting property pultrusion, in conjunction with thermoplastic extrusion method, creationary pultrude process to be combined with expressing technique, form unique pultrusion/extrude mixed method, by the three-decker pipe once-through of traditional multistep molding out, technique is advanced, and continuous seepage, takes up an area little, little investment, has substantial economics.The present invention adopts thermoplastic film or sheet material to form internal layer, internal layer is provided with the braiding of preimpregnated thermoplastic silvalin, is wound around and longitudinally configuration formation enhancement layer, internal layer and enhancement layer are provided with skin, outer employing extruder for shaping, and three-decker is combined together, this one-time formed new product combines firmly, steady quality, resistance to compression is high, there is brand-new outward appearance and superior performance, and corrosion-resistant, long service life, has broad application prospects in fields such as plumbing, fuel tube, oil feed pipes.
To achieve these goals, design a kind of thermoplastic pipe about continuous lod, this pipeline strengthens construction layer by the braiding in thermoplastic inner layer and internal layer, and outer thermoplasticity protective layer composition is provided with on internal layer and enhancing construction layer, described three-decker is by pultrusion and extrude mixed method once-through, and described internal layer adopts thermoplastic film or sheet material to form; Described enhancement layer adopts the braiding of preimpregnated thermoplastic silvalin, is wound around and longitudinally configures formation; Described skin adopts thermoplastic material to extrude with extruder on interior pipe and enhancement layer and forms, and three-decker is combined together; Described pipeline specifications is below D1000mm, uses pressure 1-15MPa.
Described internal layer is made up of with winding or longitudinal mode thermoplastic film or sheet material, and at melting temperature, form overall internal layer, thickness is about 0.2-2mm.
Described enhancement layer is undertaken weaving by designing requirement, be wound around, be longitudinally configured on internal layer by the fiber being soaked with thermoplastic material in advance, and its thickness is determined by requirement of strength.
Described skin adopts thermoplastic material when internal layer and enhancement layer melting, extrudes feed supplement, three-decker is combined together with extruder pressurization, and form on its surface the thermoplasticity protective layer that thickness is 0.5-2mm.
Described fiber is adopted as glass fibre or basalt fibre or carbon fiber or aramid fibre etc.
Described thermoplastic material is PVC or PE or HDPE or PP or PA or other modified thermoplastic matrixes.
A kind of production method of the thermoplastic pipe about continuous lod:
Creationary pultrude process to be combined with expressing technique, form unique pultrusion/extrude mixed method, by the three-decker pipe once-through of traditional multistep molding out, technique is advanced, continuous seepage, takes up an area little, little investment, there is substantial economics, and the new product produced combines firmly, steady quality, resistance to compression is high, have brand-new outward appearance and superior performance, whole production line comprises following technique:
A) internal layer thermoplastic covering technique: thermoplastic film or sheet material are evenly coated on metal core with winding or longitudinal mode;
B) fibrage, winding, longitudinal yarn configuration technique: the fiber being soaked with thermoplastic material is in advance undertaken weaving by designing requirement, be wound around, be longitudinally configured on internal layer;
C) heating process: the internal layer completed and fiber-reinforced layer are sent into die cavity by tractor and heats, reach predetermined temperature, make thermoplastic material melting; Described predetermined temperature is generally 150-280 DEG C;
D) expressing technique: internal layer and the melting of enhancement layer thermoplastic material while, extrudes feed supplement in the pressurization of side extruder, three-decker is combined together, and form thermoplasticity protective layer on surface;
E) Vacuum shaping: the pipeline pulled out through shaping cover Vacuum shaping, and cools in vacuum box;
F) cool: from vacuum shaping box pipeline out, if temperature is not also down to normal temperature, be then cooled to normal temperature further at cooler bin;
G) draw: adopt suitable tractor continuously to be pulled out by pipeline;
H) cut: cut into finished product by design length.
The invention compared with the existing technology, technological design is reasonable, retain existing RTP three-decker, creationary pultrude process to be combined with expressing technique, form unique pultrusion/extrude mixed method, by the three-decker pipe once-through of traditional multistep molding out, technique is advanced, and continuous seepage, takes up an area little, little investment, has substantial economics; The new product produced combines firmly, steady quality, quality of product obtains a leap, traditional multistep molding method is changed into one-shaping technique, make production line shorten length half, equipment investment greatly reduces, product has very high compressive strength and impact resistance, the inside and outside layer thickness of pipe that the inventive method is produced can reach about 0.5mm, this is that tratitional technology cannot realize, greatly reduce product cost, be that there is revolutionary RTP new process for producing, produce important impetus by the promotion and application of RTP.
Below in conjunction with accompanying drawing, the invention will be further described, and the structure of this device and principle are very clearly concerning the people of this specialty.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 2, the pipeline in the present invention weaves enhancement layer structure by internal layer and internal layer, and enhancement layer structure is provided with skin, and three-decker once-through forms, and wherein internal layer is made up of with winding or longitudinal mode thermoplastic film or sheet material.The fiber being soaked with thermoplastic material is in advance undertaken weaving by designing requirement, be wound around, be longitudinally configured on internal layer by enhancement layer.Outer when the thermoplastic material melting of interior pipe and enhancement layer, extrude feed supplement with extruder pressurization, three-decker is combined together, form thermoplasticity protective layer on surface.Fiber is adopted as glass fibre, basalt fibre, carbon fiber, aramid fibre etc.Thermoplastic material is PVC, PE, HDPE, PP, PA or other modified thermoplastic matrixes.
Production line designed by the present invention is as Fig. 1, first coated inner thermoplastic layer on the core of front end, then be the braiding of fiber, winding, stage casing be the external mold of heating and core and extruder, core place that die head, interior heating are formed jointly, back segment is that thermoplastic produces general vacuum shaping box, cooler bin, tractor, cutting machine etc.
Concrete production method is: be first evenly coated on core 5 by thermoplastic film or sheet material 1, to the fiber of thermoplasticity prepreg be had to be woven by interior knitting machine 2 again, then Stetch Wrapping Machine 3 carries out winding hoop layer, woven by outer knitting machine 4 again, form multilayer and strengthen structure, under tractor 14 acts on, send into heating internal mold 5, heating in the die cavity of external mold 6, heating-up temperature is determined according to different materials, general at 150-280 DEG C, the thermoplastic material of fiber surface is made to reach molten state, merge extrusion die 9 sections with the thermoplastic material extruded by screw extruder 8, formed overall.Die head heating is made up of jointly additional gas ket 7 and interior heating stick 10, pipeline is out shaped through shaping cover 11 and vacuum shaping box 12, then cools completely through cooler bin 13, enters cutting machine 15 finally by tractor 14, length is cut on request, becomes finished product.