Continuous sintering, drying zone 100 ℃～250 ℃, preheating zone 250 ℃～330 ℃, sintering zone 380 ℃～420 ℃, cooling zone less than 300 ℃. For small diameter pipes, use resin with relatively large compression, and for large diameter pipes, use resin with relatively small compression. Main equipment: mixer, preformer, vertical pusher, drying and sintering furnace.45g/ml～0.The molding process of PTFE pipes includes push method, extrusion method, hydraulic method, welding method, winding method, etc. Ordinary tube inner diameter \u0026gt; 4mm, micro tube inner diameter \u0026le; 4mm. 1. According to the pipe diameter, it can be divided into two types: ordinary pipe and micro pipe.
Generally, a dispersed PTFE resin is used, with a particle size of 500 µm and an apparent density of 0. The pressing rate decreases with the increase of pipe diameter, and accelerates with the decrease of wall thickness.55g/ml. Drying: below 210 ℃, 2h～3h Sintering: intermittent sintering, heating rate 60 ℃/h, 375 ℃\u0026plusmn;5 ℃ for 4h. Billet making: The compression rate is about 50mm/min, and the pressure is 0～3MPa.
Main technical indicators: ZBG\u0026mdash;33001\u0026mdash;85, see Table 2., among which push method is the main method.1, PTFE ordinary pipe PTFE ordinary tube is made of PTFE dispersed resin at room temperature with organic solvent as extrusion <a>PTFE coated fiberglass fabric</a> aid, and then dried and sintered. The squeeze aid usually chooses 200 and 260 mineral spirits. The secondary processing of PTFE tubing can produce PTFE heat shrinkable tubing, PTFE spiral tubing, PTFE steel wire reinforced hydraulic tubing, etc. Pushing: The temperature of the material cavity is 30 ℃～50 ℃, and the temperature of the die is 50 ℃～60 ℃..
Typical formula for producing PTFE pipe: Dispersed PTFE resin: 100 (parts by weight) Extrusion aid: 18～24 Production process: PTFE, extrusion aid\u0026rarr;mixing\u0026rarr;pressing\u0026rarr;drying\u0026rarr;sintering\u0026rarr;cooling\u0026rarr; products. Production process parameters: Mixing: temperature \u0026le; 19 ℃, time 10min～20min, after mixing, park at 25 ℃～30 ℃ for more than 24h
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The molding process of PTFE pipes includes push method
Short StoryFor small diameter pipes, use resin with relatively large compression, and for large diameter pipes, use resin with relatively small compression.
