PTFE corrugated hose has been widely used in various corrosion-resistant mechanical seals. The manufacture of the bellows is divided into two steps: first, the blank tube is manufactured and then turned. The PTFE blank tube material consists of three sections, the middle section is pure PTFE, and the two ends are filled PTFE.
1. Raw material specifications
The raw material of pure PTFE is mixed with suspension powder and filler. There are mainly the following types of fillers:
- Graphite powder: chemical reagent grade.
- Glass fiber: use alkali-free, wax-free, and surface-treating agent-free “three-nos” glass fiber yarn, pulverized by ball milling, and then passed through a 150 mesh sieve.
- Silica: Passed through a 270 mesh sieve.
2. The raw material ratio of the blank corrugated hose
2.1. Front section
- Formula 1: PTFE suspended fine powder 80%-85%; glass fiber powder 15%-20%
- Formulation 2: PTFE suspended fine powder 80%-85%; graphite powder 15%-20%
The mixture of the above formula can be fully mixed and stirred in a 2950r/min small high-speed mixer (the diameter of the stirring blade is 200-250mm) for 1-2 minutes. If it is found that it is still not fully mixed, stir again.
2.2. The middle corrugated pipe section is made of pure PTFE coarse powder.
2.3. Back section (fixed section)
90% of PTFE suspended fine powder; 10% of glass powder or glass fiber powder. The two materials are also mixed in a high-speed mixer.
3. Blank Hose pressing
Calculate the quality of the powder with a density of 2.7g/cm³, weigh the materials separately, and add them to the mold in order. In order to make the blank stratified clearly, put the press mold into the mold for a little light pressure for each material added, and then add the second and third materials. After all the materials are added to the mold, use a pressure of 30-50MPa for molding on the press; the pressure holding time is 5-10min for full exhaust (depending on the height of the part), and the mold can be demolded after the pressure is maintained.
The height of the mold is sometimes too high, exceeding the maximum working height of the press, causing processing difficulties. Before adding the second material, the surface must be scratched with a small rod on the initially pressed material surface, so as to ensure the quality of the pressed blank.
4. The sintering of the PTFE blank Hose
The pressed blank is sintered in a sintering furnace, and it is heated at a heating rate of 1-2°C/min. When the temperature in the furnace reaches 320°C, the turntable is turned on for 1 hour. Then continue to heat to 375-3800C at a heating rate of 1℃/min, and keep it at this temperature. The holding time is calculated as 10min per millimeter of wall thickness. After holding, it will be cooled with the furnace (the furnace door cannot be opened), and the temperature will naturally drop to room temperature.
Due to the different raw materials, pressing and sintering processes of the corrugated pipe blank, brittleness, and cracks in the corrugated section will occur. Therefore, it is necessary to summarize the experience in time during production and determine a reasonable process according to different raw materials. If the quenching process is adopted, the toughness of the corrugated hose can be greatly improved.
We are a manufacturer of PTFE thin wall flexible tubes. now looking for expansion and want to add new demanding product in our product range. In India, we would like to start the PTFE corrugated tube production. we found you have experience in this. how can you help with this
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