and stiffness fibers that are weak will yield under a force fibers that are not thermally stable will collapse due to gravitational force or distort shrinkage upon exposure to elevated temperatures fibers that are brittle will break when exposed to any force in turn when the fibers are affected the entire insulation product is impacted thus the produce fails a fiber that has good orientation and has been given thermal stability such as heat setting will provide a fiber that will make up a good insulation product 1 first orientation of fiber fiber formation has remained the same as described in previous patent applications assigned to the assignee of the present application the fiber is extruded from a die which has a multitude of openings holes or the like on the order of 0 5 mm in diameter this hot extrudate is pushed out of the die hole and forms a molten fiber high velocity air e g hot for pet or cold for polypropylene is directed around the newly formed fiber with both air and fiber directed in the same axis for this discussion vertical direction this air quickly carries the molten fiber downwardly and begins to orient the fiber 2 second orientation instead of keeping the fiber in the hot air until collected a mechanical roller is located such that it is adjacent to the stream of fibers see fig1 the fibers are placed on the roller which is spinning the downward force of the air orients the fiber the preferred.