Coloring Technology for Plastics by Ronald M. Harris

By Ronald M. Harris

The papers during this anthology have been provided in the course of seven ANTEC and RETEC symposia among 1995 and 1998, and chronicle a few of the advances within the plastics coloring know-how box in the course of that point span. The unifying subject matter of the papers is "creating extra value.The interactivity of the package deal layout method has endured to call for advances in coloring know-how, and the worth of having the ability to use product visual appeal is obviously obvious. differently to create price is via being responsive via "Speed to marketplace. brands and providers need to reply to the call for in their shoppers, but fabricators can't be neglected of their wish for first run recognition of colour. a majority of these matters etc are mentioned inside this authoritative assessment of coloring expertise.

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Also they have been dispersed on equipment that is designed to do as little as possible damage to the flakes during the extrusion process because aluminum flakes that are bend during processing are less bright. Metallic Looking Plastics 51 To make these flakes tougher and more resistant to bending they are offered by one supplier at a thickness of 8-10 µm compared to 2 µm of regular aluminum pigments. These thicker flakes are available at particle sizes of 125 µm, 225 µm and 330 µm. The larger the particle the less their ability to hide.

The well mixed blend is then incorporated into the plastic. When blending the plastic with the granules, the danger of damaging the flakes in the blending process has been substantially reduced because the metal particles are now protected by the carrier resin. A short blending time on the Henschel type mixer should in this case not harm the metallic flakes. If the plastic is liquid as is the case of reactive polyester (UPE) or methyl methacrylate resins, the metal paste should first be diluted with a liquid like styrene in case of UPE at a ratio of 1:1.

INTRODUCTION Aluminum pigments have not been favored in the past for injection molded parts for more than one reason. If they were used as powders there was always a concern that they could present a hazard. This was widely overcome by using these pigments pasted in polyethylene wax or in a predispersed form as concentrates provided by their supplier. The second reason was that aluminum pigments cause flow lines in injection molded parts which in most cases can not be tolerated. APPLICATION OF ALUMINUM PIGMENTS IN PLASTICS Aluminum pigments did find wide application in plastic films for garbage bags, canvases, as heat reflectors and for agricultural applications.

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