be utilized these thermoplastic materials will preferably exhibit a melt temperature in the region of 190 u00b0 c in accordance with conventional injection molding machine practice with regard to the reinforcing fibers 82 it has been found that glass fibers having a diameter in the range of 12 to 14 microns and a length of approximately 0 125 to 0 25 inches are preferable from both performance and economic standpoints these fibers are added to the plastic media such that the final mix is preferably 70 thermoplastic media and 30 glass fibers by weight such glass fiber reinforced plastics are known in the art and are typically supplied in bulk in 1 8 inch to 1 4 inch diameter pellets which assists and simplifies handling and transfer of the material this glass fiber reinforced thermoplastic material is melted and supplied through the runners the sprues 34 the gates 78 and then into the mold cavities 80 as noted above the diameter of the gate 78 is relatively small being in the range of from 0 030 inches to 0 040 inches when reinforcing fibers 82 of approximately 0 125 inches in length are utilized it is believed that such a diameter to length ratio assists and is primarily responsible for the orientation of the glass fibers within the thermoplastic material as they enter the mold cavity 80 as the material enters the mold cavity 80 the flow is generally laminar in opposite.