Rotomolding process to form a product having multiple colors in

Details Rotomolding process to form a product having multiple colors in Rotomolding process to form a product having multiple colors in

1998-12-24

2000-10-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264301, 264310, 425130, 425429, B29C 3912

Patent

active

06126881&

ABSTRACT:
A process for forming a product having multiple and well defined color patterns. In a first embodiment, the rotomolding process comprises a first step of using a first powder having a first color and a second powder having a second color which is different than the color of the first powder. The rotomolding process comprises a second step of placing the first and second color powders into a pre-determined pattern within a hollow cavity mold. The rotomolding process comprises a third step of placing the closed hollow cavity mold into the oven. The rotomolding process comprises a fourth step of heating the hollow cavity mold with no rotation for a first period defined by the heating time necessary for a layer of individual colors to melt in the desired pattern upon the inside surface of the hollow cavity mold. The rotomolding process comprises a fifth step of rotating the hollow cavity mold in a bi-axis manner while heating the hollow cavity mold for a second period of time defined by the heating time necessary to completely melt the remaining material in the hollow cavity mold. The rotomolding process comprises a sixth step of cooling the hollow cavity mold to solidify the product. The rotomolding processes comprises a seventh step of removing the product from the hollow cavity mold. The resulting product comprises a first color pattern having the color of the first color powder and a second color pattern having the color of the second color powder.

REFERENCES:
patent: 4032600 (1977-06-01), MacAdams et al.
patent: 4610620 (1986-09-01), Gray
patent: 4692293 (1987-09-01), Gray
patent: 5093066 (1992-03-01), Batchelder et al.
patent: 5316715 (1994-05-01), Gray

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