Coating processes – Nonuniform coating – Applying superposed diverse coatings or coating a coated base
Reexamination Certificate
2001-03-21
2004-10-05
Parker, Fred J. (Department: 1762)
Coating processes
Nonuniform coating
Applying superposed diverse coatings or coating a coated base
C427S264000, C427S430100
Reexamination Certificate
active
06800324
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the manufacture of plastic objects. In particular, the present invention relates to a method of treating porous plastic objects and products produced thereof.
BACKGROUND OF THE INVENTION
Plastic objects are commonly produced using rapid prototyping techniques for testing purposes before the more expensive permanent mold is made for mass production purposes. Different techniques and apparatus are available for producing rapid prototypes. The prototypes produced are typically made of metallic composites or plastic. For plastic prototypes, acrylic, ABS and nylon are common materials used.
Nylon prototypes are typically produced from powdered nylon using techniques such as selective laser sintering, while acrylic and ABS prototypes are produced by stereolithography and fused deposition method respectively. The prototypes produced have a high level of accuracy, but often assume a rough, mat appearance that usually does not look like their injection moulded counterparts.
Injection moulded plastic, on the other hand, may be produced with the relevant dyes added into the material for molding, and the high molding temperature and pressure causes complete melting and mixing of the plastic and dye to form a non-porous, solid part. If texturing is desired of the part, chemical etching or sanding is usually performed on the injection mold itself, such that the desired texture is automatically created on the surface of the mold during the molding process.
There is, however, presently no techniques to improve the appearance of parts produced by rapid prototyping technique (e.g. to provide surface texturing or colouring). It is therefore an object of the present invention to provide a method for improving the characteristics of porous plastic parts.
REFERENCES:
patent: 3911170 (1975-10-01), Honjo et al.
patent: 4980235 (1990-12-01), Scheer et al.
patent: 5470609 (1995-11-01), Leach et al.
patent: 5525370 (1996-06-01), Hoebeke et al.
patent: 5937754 (1999-08-01), Scott et al.
Chong Kong Fok
Maung Zaw Hlwan Moe
Tong Tuck Sung
Lawrence Y.D. Ho & Assoc.
Nanyang Polytechnic
Parker Fred J.
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