Method for removing metallic foreign matter from fluororesin and method for producing fluororesin with reduced metallic foreign matter
AssigneesDaikin Industries, Ltd., Daikin Fluorochemicals (China) Co., Ltd.
InventorsMasayoshi Miyamoto, Hiroyuki Sendan, Kouichi Hirota, Makoto Kawamorita, Tsunehiko Fuwa
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Abstract
A method for removing metallic foreign matter from a fluororesin and a method for producing a fluororesin with reduced metallic foreign matter, which methods include applying a magnetic field to a fluororesin with a magnet while dropping the fluororesin by gravity to thereby remove metal, wherein the methods provide a screen made of a magnetic material in a flow path of the fluororesin dropped by gravity, and when the fluororesin passes through the screen, the screen is not vibrated.
Claims6
A method for removing metallic foreign matter from a fluororesin, the method comprising:
- applying a magnetic field to a fluororesin containing the metallic foreign matter with a magnet while dropping the fluororesin by gravity to thereby remove metal,
- wherein the method provides a screen made of a magnetic material in a flow path of the fluororesin dropped by gravity,
- the fluororesin is dropped from a position above the screen in a vertical direction and travels toward the screen by gravity, the metallic foreign matter becomes magnetically attached to the screen, and the fluororesin from which the metallic foreign matter has been removed passes through the screen and is discharged from a position below the screen in the vertical direction, and
- when the fluororesin passes through the screen, the screen is not vibrated.
A method for producing a fluororesin with reduced metallic foreign matter, comprising a step of applying a magnetic field to a fluororesin with a magnet while dropping the fluororesin by gravity to thereby remove metal,
- wherein the method provides a screen made of a magnetic material in a flow path of the fluororesin dropped by gravity,
- the fluororesin is dropped from a position above the screen in a vertical direction and travels toward the screen by gravity, the metallic foreign matter becomes magnetically attached to the screen, and the fluororesin from which the metallic foreign matter has been removed passes through the screen and is discharged from a position below the screen in the vertical direction, and
- when the fluororesin passes through the screen, the screen is not vibrated.
Dependencies are inferred from the claim text.