Fluorine resin gasket for pipe seal
A technology for fluororesin and sealing, which is applied in the sealing of engines, mechanical equipment, and other chemical processes, etc. It can solve the problems of gas or liquid leakage, small compression rate, etc., and achieve the effect of high compression rate and excellent recovery
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Embodiment 1
[0057] Polytetrafluoroethylene (PTFE) fine powder [manufactured by Daikin Industries, Ltd., product number: F104] 1215 g, hollow glass beads [manufactured by Potters-Ballotini Co., Ltd., product number: CMC-20, average particle diameter: 60 μm, relative density: 0.25, compressive strength: 0.7 MPa] 135 g and hydrocarbon organic solvent [manufactured by Exxon Mobil Co., Ltd., trade name: Isopar G] 250 g were mixed with a kneader for 5 minutes, and the Extrusion was carried out with an extruder having a size of 300 mm×20 mm to produce a preform.
[0058] Next, for the preform obtained above, the linear pressure during rolling was adjusted to 10 kN / m, the roll speed was adjusted to 6 m / min, the temperature of the rolls was adjusted to room temperature (about 25° C.), and it was passed through the double rolls in sequence. (roller diameter: 700mm, roll interval: 20mm), double roll (roller diameter: 700mm, roll interval: 10mm), double roll (roller diameter: 700mm, roll interval: 5m...
Embodiment 2
[0070] In Example 1, except that the linear pressure during rolling was changed from 10 kN / m to 20 kN / m, a sheet gasket with a thickness of 3 mm was obtained in the same manner as in Example 1 (ratio of voids in the bead: 0.27) .
[0071] Next, as the physical properties of the sheet-like gasket obtained above, the leakage amount, compression amount (compression ratio), recovery amount, and density were examined in the same manner as in Example 1. As a result, the leakage of the sheet gasket was 4.0×10 -5 Pa·m 3 / s, the compression amount is 0.76mm, the compression rate is 25%, the recovery amount is 0.35mm, and the density is 1940kg / m 3 .
Embodiment 3
[0073] In Example 1, except that the linear pressure during rolling was changed from 10 kN / m to 5 kN / m, a sheet gasket with a thickness of 3 mm was obtained in the same manner as in Example 1 (ratio of voids in the bead: 0.58) .
[0074] Next, as the physical properties of the sheet-like gasket obtained above, the leakage amount, compression amount (compression ratio), recovery amount, and density were examined in the same manner as in Example 1. As a result, the leakage of the sheet gasket was 8.0×10 -5 Pa·m 3 / s, the compression amount is 0.91mm, the compression rate is 30%, the recovery amount is 0.43mm, and the density is 1560kg / m 3 .
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