Rotomolding process to form a product having multiple colors in a non-random, sequentially segregated and controlled patterns
US6126881A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Dec 24, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/251
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.