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Polymer powders for SIB processes

Inactive Publication Date: 2006-11-02
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The SLS process however suffers from high equipment costs, in particular the cost of the laser.
Further, the processing speed in laser sintering is relatively slow because large areas have to be scanned by a point light source.
These disadvantages have inhibited wide adoption of this process for producing computer-designed objects, and therefore the application of the SLS process currently remains restricted to rapid prototyping.
An additional problem with SLS is the process' inability to process colored powders, especially dark-colored powders.
The disadvantage with most polymer powders is relatively high shrinkage, arising in particular during the sintering of polymer powders.
The processing temperatures of some polymer powders are moreover unsuitable in sintering because the high temperatures required during processing can cause technical problems during processing.

Method used

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Examples

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examples

[0057] Triangular objects with edge length 50×50 mm were produced by means of the process of the invention for the selected inhibition of bonding. For this, a square metal frame with internal dimensions of 50 mm and external dimensions of 100 mm, with a thickness of 1 mm, was placed on a continuous metal plate. The resultant aperture was then filled with powder and another metal plate was used for smoothing. One half of the rectangle was then protectively covered, using a flexible metal plate. The remaining powder surface was then uniformly wetted, by spray-application, using an air-brush gun, with water which had been treated with 10% by weight of a washing composition (Pril, Henkel). After removal of the protective covering, the entire powder layer was heated for 2 and, respectively, 5 seconds at a distance of 2 cm from a radiant heater from the company AKO, having a power rating of 1000 watts. This gave a powder layer including, as component, a triangular structure comprising sin...

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Abstract

A process of selective inhibition of bonding (SIB) to produce three-dimensional objects is used to obtain high-quality moldings. High-quality moldings can be produced by using pulverulent materials which have a median particle size of from 10 to 200 μm in which at least one polymer or copolymer selected from polyester, polyvinyl chloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, polymethyl methacrylate (PMMA), PMMI, ionomer, polyamides, copolyester, copolyamides, terpolymers, or ABS, or a mixture of these, is present.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a polymer powder which can be used for producing three-dimensional objects by means of selective inhibition of bonding (SIB), and to a process in which these powders are used. [0003] 2. Description of the Related Art [0004] Very recently a need for the rapid production of prototypes has arisen. Selective laser sintering (SLS) is a process particularly well suited to rapid prototyping. In the SLS process, polymer powders are selectively and briefly irradiated in a chamber with a laser beam. Particles of powder exposed to the laser beam melt. The molten particles fuse and solidify to give a solid mass. Three-dimensional bodies can be produced simply and rapidly by repeatedly applying fresh layers of polymer powder and exposing the fresh layers of polymer powder to the laser beam. [0005] The process of laser sintering (rapid prototyping) to produce moldings from pulverulent polymers is describe...

Claims

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Application Information

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IPC IPC(8): D04H1/16C08J7/04B29B13/08B29C65/34B29C67/00B29C67/04
CPCB29C67/0077Y10T156/10Y10T428/2982B29C64/153B33Y80/00B33Y70/00B33Y10/00B29K2509/08B29K2077/00B29K2067/00B29K2505/02
Inventor MONSHEIMER, SYLVIAGERTH, CHRISTIANBAUMANN, FRANZ-ERICHGREBE, MAIK
Owner EVONIK DEGUSSA GMBH
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