High-strength pipe made by thermoplastic continuous fiber prepreg tapes and manufacturing method and manufacturing equipment

Abstract

The invention relates to the tubing product field produced by substance in plastic or plastic state, in particular to a high-strength pipe made by thermoplastic continuous fiber prepreg tapes and a manufacturing method and manufacturing equipment.The high-strength pipe made by thermoplastic continuous fiber prepreg tapes comprises an inner layer pipe (1), a core layer (2) and a surface layer pipe (3), all of which are sequentially sleeved from the inside to the outside. The manufacturing method for high-strength pipe made by thermoplastic continuous fiber prepreg tapes is characterized by comprising following steps: heating, fusion, extrusion, cooling and cutting.The manufacturing equipment for high-strength pipe made by thermoplastic continuous fiber prepreg tapes is characterized by comprising an extruder and a co-extrusion composite die which are arranged in sequence. The high-strength pipe is overpressure resistant, highly-rigid and is low in expansion.

Description

technical field [0001] The invention relates to the field of pipe products produced by plastic or materials in a plastic state, in particular to a high-strength pipe with thermoplastic continuous fiber prepreg and its manufacturing method and manufacturing equipment. Background technique [0002] Polyolefin thermoplastic pipes have the advantages of no rust, corrosion resistance, long service life, energy saving, recyclable reuse, etc., and are very popular in the market. Pipeline and other fields have been widely promoted and applied. [0003] Compared with composite material systems, pure plastic pipes have low tensile strength, low ring stiffness, low creep resistance, and high expansion disadvantages, such as: 1. Polymer materials are prone to creep under temperature and pressure, resulting in over time The extension of the pipeline will gradually reduce the pressure of the pipeline. In order to make the plastic pipeline last long enough, the pipeline manufacturer incre...

AI Technical Summary

Problems solved by technology

[0011] 1. The rigidity of the inner plastic thin-walled pipe is not enough. Driven by the rotating positioning wheel, pressurizing wheel, and winding belt, the inner layer pipe is easily twisted and deformed under the heating temperature of the surface of the welding winding belt, and in severe cases, it becomes twisted. So that it is impossible to produce qualified products

[0012] 2. Since the ring rigidity of the pure plastic inner tube itself is not enough, the wrapping tape is melted and pasted at the surface heating temperature, and the inner thin-walled tube is easily dented and deformed at the pressure point of the pressure wheel, and the dented deformation is very easy to cause the wrapping tape Quality defects caused by separation from the outer surface of the inner tube

[0013] 3. Since the mechanical properties of the continuous fiber prepreg tape are unidirectional tapes, the hoop burst stress and extrusion rigidity (ring stiffness) of the pipe can be improved after winding, but it has little effect on the axial tensile strength, so directly The composite pipe produced by winding the continuous fiber prepreg tape has the same large axial linear expansion coefficient as the pure plastic pipe, which cannot meet the requirements of the hot water pipe.

[0014] 4. Since the inner pure plastic pipe is heated and fused with the wrapping tape, its longitudinal shrinkage rate (circumferential shrinkage stress) is large. During the cooling process after winding the core pipe, especially the large-diameter wound core pipe, The shrinkage stress of the inner tube is very easy to pull off and separate the winding layers of the hot-melt adhesive prepreg tape, or leave hidden dangers due to residual stress;

[0015] 5. Due to the insufficient rigidity of the pure plastic pipe in the inner layer, it indirectly affects the rigidity of the pipe after winding, directly reducing the rigidity index of 1 to 2 orders of magnitude

[0016] 6. Due to the large linear expansion coefficient of the inner pure plastic pipe, the thermal expansion stress is large, which indirectly reduces the compressive strength of the wound composite pipe

[0017] 7. Core layer reinforcement materials such as steel wire mesh, steel skeleton mesh, aluminum foil, etc. are bonded with inner and outer layer materials in the form of hot melt adhesive, which is very easy to cause delamination of the pipe section due to the quality of hot melt adhesive, or use aramid tape, fiber tape The infusible winding is in the middle layer of the pipe section, and the above two forms of reinforcement structures cannot form a combined force to improve the compressive strength of the pipe

[0018] 8. The unfoamed outer tube can’t play the role of insulation layer. In the application of heating, air conditioning, and hot water pipelines, secondary insulation materials should be used, which not only consumes labor but also increases energy consumption.

[0019] Patent CN201202892Y discloses a reinforced PPR composite pipe. This three-layer composite pipe technology only adds a layer of short fiber reinforced composite material to the core layer. The chopped fiber thermoplastic material cannot greatly improve the compressive strength of the pipe and the long-term Therefore, the wall thickness of composite pipes such as PPR reinforced by this technology is almost the same as that of pure plastic pipes, which is 2 to 10 times the wall thickness of continuous fiber prepreg tape reinforced pipes, and cannot be reduced. Wall thickness, material saving, and energy consumption reduction; at the same time, the outer layer of this technology is also a solid wall material, which also has the same disadvantages as the patent CN101474873A

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