Process for melting/sintering powder particles for layer-by-layer production of three-dimensional objects
US-2017274591-A1 · Sep 28, 2017 · US
Apparatus for heating polymeric powders by means of radiation in powder coating methods
US10356849B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10356849-B2 |
| Application number | US-201715705052-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 14, 2017 |
| Priority date | Oct 4, 2016 |
| Publication date | Jul 16, 2019 |
| Grant date | Jul 16, 2019 |
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- Title
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Abstract
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An apparatus for heating powder particles, contains a radiation source (1), a housing (2) and a screen (4). The radiation source (1) has its maximum radiative power in the wavelength range of 0.78-2.5 μm. The screen (4) has an absorbance of at least 0.8 in the wavelength range of 0.78-2.5 μm.
First claim
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The invention claimed is: 1. An apparatus for heating polymer powder particles, comprising: a radiation source, a housing, and a screen, wherein the radiation source has its maximum radiation power within the wavelength range of 0.78-2.5 μm and the screen has an absorbance of at least 0.8 within the wavelength range of 0.78-2.5 μm. 2. The apparatus according to claim 1 , wherein the surfaces of the housing facing the radiation source have an absorbance of less than 0.4 within the wavelength range of 0.78-2.5 μm. 3. The apparatus according to claim 1 , wherein the screen is arranged between the radiation source and a guard plate. 4. The apparatus according to claim 3 , wherein the guard plate has a transmittance of at least 0.9 within the wavelength range of 2.5 μm-10 μm. 5. The apparatus according to claim 3 , wherein housing, screen and guard plate are thermally decoupled. 6. The apparatus according to claim 1 , wherein the screen consists of anodized and coloured aluminum. 7. The apparatus according to claim 1 , wherein the screen has a thickness of not more than 1 mm. 8. A method of heating polymer powder particles, said method comprising: heating the polymer powder particles with an apparatus according to claim 1 , wherein the polymer powder particles are exposed to the radiation from the apparatus. 9. The method according to claim 8 , wherein the polymer powder particles are heated at a heating rate of at least 2 K/s. 10. A method of coating a powder, said method comprising: heating of polymer powder particles with an apparatus according to claim 1 .
Assignees
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Classifications
Polyamides · CPC title
applied as powders · CPC title
with IR heaters · CPC title
heating devices not specially adapted for a particular application · CPC title
Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C09D177/10 takes precedence) · CPC title
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- What does patent US10356849B2 cover?
- An apparatus for heating powder particles, contains a radiation source (1), a housing (2) and a screen (4). The radiation source (1) has its maximum radiative power in the wavelength range of 0.78-2.5 μm. The screen (4) has an absorbance of at least 0.8 in the wavelength range of 0.78-2.5 μm.
- Who is the assignee on this patent?
- Evonik Degussa Gmbh
- What technology area does this patent fall under?
- Primary CPC classification H05B3/0057. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 16 2019 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).