Chroma Corporation

Robert D Swain

Ralph Anthony Stanziola

A method for making rotationally molded objects using resin blends. The resin blend comprises resin pellets and an amount of ground resin powder sufficient to yield rotomolded objects having desirable impact strength and other strength characteristics. Preferably, the resin blend comprises of from about 20% to about 50% by weight of ground resin powder. The resin pellets may optionally contain a reinforcing agent, and such pellets serve as a vehicle for effectively introducing desired reinforcing agents into the product being rotomolded. In addition, resin blends can be used to produce colored objects by rotational molding techniques.

Method of rotational molding using a resin blend and the resulting molded objects

The method uses color to determine the wear of the screw and barrel of the molding machine. The method measures the color and/or color variation to determine the wear. A first material of a first color and a second material of a second color are fed into the machine to create a third material with a third color. The third material is either extruded to form a part or is injected into a mold to form a part. The color of the part is then measured with a measuring device, such as, spectrophotometer. The color will change as the screw and barrel wear. The color value would then be compared with previous color values to determine the amount of wear.

Method of determining wear

A method for making rotationally molded objects using resin blends. The resin blend comprises resin pellets and an amount of ground resin powder sufficient to yield rotomolded objects having desirable impact strength and other strength characteristics. Preferably, the resin blend comprises of from about 20% to about 40% by weight of ground resin powder. The resin pellets may optionally contain a reinforcing agent. In addition, resin blends can be used to produce colored objects by rotational molding techniques.

Method of rotational molding using a resin blend

A method for making rotationally molded objects using resin blends. The resin blend comprises resin pellets and an amount of ground resin particles sufficient to yield rotomolded objects having desirable impact strength and other strength characteristics. Preferably, the resin blend comprises of from about 20% to about 30% by weight of ground resin particles. In addition, resin blends can be used to produce colored objects by rotational molding techniques.

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Lake Barrington, IL, United States of America

Robert D Swain