A process for the impregnation of carbon fiber bundles enables the carbon fiber bundles to be impregnated with a curable liquid resin without the impregnated fiber bundles sticking together. The tray further includes at least one end wall that extends perpendicularly outward from one of the first, second, third and fourth edge portions of the bottom panel, and at least one side wall that extends perpendicularly outward from another of the first, second, third, and fourth edge portions of the bottom panel. The plurality of service centers are provided with each service center having an associated computer adapted to extract data.