IN MOULD PAINTING USING GRANULAR INJECTED PAINT TECHNOLOGY

摘要

Simultaneous dual injection moulding has been applied to in-mould paint polypropylene using Granular Injected Paint Technology (GIPT). Painting an injection moulded polypropylene component is usually a multistage process. Priming is necessary because of polypropylene's low surface energy. Even water-based or high-solid top-coating have the unwanted side-effects of some volatile organic solvents, overspray and sticky waste all needing careful disposal. However, these problems are all overcome by using the patented GIPT system. This system has proved more economical, efficient and environmentally acceptable than the traditional methods used for painting polymer components. This paper explains the process, including simultaneous dual injection moulding, the use of compatibilisers to achieve adhesion, and the choice of paint. It also outlines processing and material constraints for the process, and the cost, environmental and efficiency benefits that can be expected when using GIPT.