Device for preparing coated filaments for extrusion-based 3D printing
a technology of extrusion-based 3d printing and coating filaments, which is applied in the direction of additive manufacturing processes, manufacturing tools, transportation and packaging, etc., can solve the problems of not being able to achieve sharp color transitions, producing single-color or non-specifically colored 3d objects, and wasting time and energy
Inactive Publication Date: 2015-11-12
EVONIK ROEHM GMBH
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AI Technical Summary
Benefits of technology
The present invention provides a process for extrusion-based 3D printing by coating a filament with a coating composition before melting and extruding it onto a substrate to form a three-dimensional object. The coating composition may contain an additive, pigment, or ink. The filament may be made from thermoplastically processable material or an acid-, base- or water-soluble polymer. The invention allows for the creation of improved extrusion-based 3D printing processes and objects.
Problems solved by technology
This is complicated and time-consuming.
Again, the first step of this process can only produce single-color, or non-specifically colored, 3D objects.
However, no sharp color transitions are possible, because of the mixing chamber.
This type of process moreover lacks sharpness at the limits of the hardening process, and this can reduce surface smoothness, and can sometimes lead to non-uniform coloring.
This process is extremely complicated, and leads to color definition that lacks sharpness.
This type of process can only produce a structure of layer-by-layer colors, except in so far as mixing can occur between the uncured layers of liquid.
However, this process has the disadvantage that it is impossible to achieve uniform color definition or bright coloring, since there is no possibility of achieving uniform penetration of the ink into the composite made of the (ceramic) powder and of the binder.
However, there are problems with the uniform mixing of the two materials and with the complicated two-stage process.
This mixing is therefore rarely complete.
In the second procedure, pressure differences in the connecting lines can lead to extreme color variations.
This process is slow, and printing of the thermoplastics that are already curing leads to poorly resolved color definition.
This method requires very complicated apparatus, and many advantages of FDM are lost.
The said mixing can certainly not be complete, and the quality of print representation is correspondingly poor.
Another disadvantage of this method is moreover that granulates or powders must be used and that these require separate storage and melting in the machine.
However, this leads to inadequate mixing and does not give clean color definition.
This process requires very sophisticated and complicated apparatus.
However, this variant also exhibits the disadvantages described.
However, on-line coating has the disadvantage of requiring specific 3D printers with a corresponding on-line coating system.
Method used
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Embodiment Construction
[0035]The present invention provides a process for the production of coated filaments for use in an extrusion 3D printing process, and also a device for the coating of the filaments, and rolls of the coated filaments.
[0036]According to the present invention, simple modification of filaments with resultant appropriate change to, or improvement in, for example, their electrical or thermal conductivity, their spectral absorption, IR absorption or UV absorption, optical properties, gloss, haptic properties, adhesion properties, wetting properties, water adsorption, mechanical properties, reactivity and interlayer adhesion may be achieved. The process according to the present invention provides for an efficient production of print filaments which exhibit an additional benefit in use, extending beyond the properties of the polymeric material. In particular, the present invention is an efficient process which does not coat the entire polymer but instead specifically coats the surface of th...
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Abstract
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional application of prior U.S. application Ser. No. 14 / 073,098, filed Nov. 6, 2013, the disclosure of which is incorporated herein by reference in its entirety. The parent application claims priority to European Application No. 12192053.2, filed Nov. 9, 2012, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to a novel process for the production of coated filaments for subsequent application as print in extrusion-based 3D printers, e.g. FDM printers (fused-deposition-modelling printers). The filaments according to the invention are coated in a separate process outside of the printer, and may be used in an appropriate unmodified conventional extrusion printer. The present invention further relates to the coating device for the conduct of the said process and to rolls with coated filaments.[0003]Rapid prototyping or rapid man...
Claims
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IPC IPC(8): B29C67/00B29C48/05B29C48/06
CPCB29C67/0085B33Y70/00B33Y30/00B29C67/0055Y10T428/2933B33Y10/00B29C64/118B29C64/314B29C64/106D01D11/06B29C64/20B33Y50/02B05D2256/00B05D7/20B05D2201/02B05D1/265B29C48/06B29C48/05
InventorPRIDOEHL, MARKUSBEHRENS, ULRIKEBERNHARDT, STEFANKLAAR, ANN-KRISTINVON KARSA-WILBERFORCE, SAMUEL
OwnerEVONIK ROEHM GMBH