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Method for removing metallic foreign matter from fluororesin and method for producing fluororesin with reduced metallic foreign matter
US12420290B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12420290-B2 |
| Application number | US-202318507699-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 13, 2023 |
| Priority date | May 20, 2021 |
| Publication date | Sep 23, 2025 |
| Grant date | Sep 23, 2025 |
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- Title
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Abstract
Official abstract text for this publication.
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.
First claim
Opening claim text (preview).
What is claimed is: 1. 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. 2. The method for removing metallic foreign matter from a fluororesin according to claim 1 , wherein the magnet is an electromagnet. 3. The method for removing metallic foreign matter from a fluororesin according to claim 1 , wherein the fluororesin is a powder, a pellet, or a granulated product. 4. 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. 5. The method for producing a fluororesin according to claim 4 , wherein the magnet is an electromagnet. 6. The method for producing a fluororesin according to claim 4 , wherein the fluororesin is a powder, a pellet, or a granulated product.
Assignees
Inventors
Classifications
Purification · CPC title
characterised by the magnetic field, e.g. its shape or generation · CPC title
Parts being designed to be removed for cleaning purposes · CPC title
using coils · CPC title
PVDF, i.e. polyvinylidene fluoride · CPC title
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- What does patent US12420290B2 cover?
- 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 …
- Who is the assignee on this patent?
- Daikin Ind Ltd, Daikin Fluorochemicals China Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B29B17/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 23 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).