10
2023
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03
The prospect of PP tube chemical extrusion technology in the market
PP pipe has good mechanical properties, and has excellent corrosion resistance, light weight in the process of use, convenient equipment, no maintenance, and the use of steel as a common project of the sewer pipe, due to corrosion in the process of use, it is necessary to often coated with paint, high maintenance costs. PP tube is not the same type of raw materials or the same type of different trademark raw materials are involved in the hopper in the extruder host and each co-extruder, after plasticizing, melting, the material is quantitative, constant pressure squeezed into the head, transported to the respective distribution of the flow channel.
Under the action of pressure and temperature, these melts "go their own way", and then gather in the die area, and extrude from the forming section of the head, and after cooling and shaping, the processing method of the required composite profiles is obtained. There should be shunt equipment in the head, plastic composite pipe in the co-extrusion molding, plastic melt in the inlet mold before, it is necessary to go through the head of the shunt equipment, so that the molten material from the extruder gradually into a ring, together with the material is very good plasticizing, so the head to set the shunt cone and shunt bracket shunt equipment.
In the process of elastoplastic bending of the pipe, the lateral material is stretched and deformed under the action of tangential tensile stress. According to the production experience of the cooperative enterprise for more than ten years and the author's tests, it is proved that when the lateral elongation deformation of the bend pipe exceeds a certain value, the lateral wall material of the pipe will have some deformation instability and some strain cracking. Therefore, the forming limit of pipe bending can be determined according to the relative plastic elongation of the material, namely the elongation rate. Generally, metal pipes used in construction and common engineering need to be exchanged for about 20 years, and pph pipes with excellent processing function have a service life of as long as 50 years.
Chemical pipeline mainly transport industrial wastewater, mud and corrosive media, some transport medium temperature is higher. Therefore, the pressure resistance, chemical corrosion resistance, wear resistance and temperature resistance of the pipe are very important for the normal operation of the pipe system. General PP tube material rigidity is strong, poor tolerance, temperature resistance grade can not meet the demand. The addition of knife nucleating agent can greatly improve the thermal deformation temperature and impact strength of homopolymer PP, reduce the notch sensitivity of data, in addition to good chemical resistance, high temperature resistance and outstanding creep resistance, excellent pressure resistance, resistance to external wear.
Under the action of pressure and temperature, these melts "go their own way", and then gather in the die area, and extrude from the forming section of the head, and after cooling and shaping, the processing method of the required composite profiles is obtained. There should be shunt equipment in the head, plastic composite pipe in the co-extrusion molding, plastic melt in the inlet mold before, it is necessary to go through the head of the shunt equipment, so that the molten material from the extruder gradually into a ring, together with the material is very good plasticizing, so the head to set the shunt cone and shunt bracket shunt equipment.
In the process of elastoplastic bending of the pipe, the lateral material is stretched and deformed under the action of tangential tensile stress. According to the production experience of the cooperative enterprise for more than ten years and the author's tests, it is proved that when the lateral elongation deformation of the bend pipe exceeds a certain value, the lateral wall material of the pipe will have some deformation instability and some strain cracking. Therefore, the forming limit of pipe bending can be determined according to the relative plastic elongation of the material, namely the elongation rate. Generally, metal pipes used in construction and common engineering need to be exchanged for about 20 years, and pph pipes with excellent processing function have a service life of as long as 50 years.
Chemical pipeline mainly transport industrial wastewater, mud and corrosive media, some transport medium temperature is higher. Therefore, the pressure resistance, chemical corrosion resistance, wear resistance and temperature resistance of the pipe are very important for the normal operation of the pipe system. General PP tube material rigidity is strong, poor tolerance, temperature resistance grade can not meet the demand. The addition of knife nucleating agent can greatly improve the thermal deformation temperature and impact strength of homopolymer PP, reduce the notch sensitivity of data, in addition to good chemical resistance, high temperature resistance and outstanding creep resistance, excellent pressure resistance, resistance to external wear.
Dongguan Hete Plastic Products Co., Ltd.
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