an apparatus for the manufacture of plastic pellets including an extruder , a chiller positioned to receive and solidify extruded strands from the extruder and , a pelletizer for converting such strands to pellets . the apparatus includes a quality testing device having a valve connected to the extruder , an injector having a sample receiving position operably connected to the valve , and a sample mold for forming solidified test samples of the material for analysis . the injector also has an ejection position operably connected to a mold inlet for injecting such samples into the mold .