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plaques,25 bubbles, blisters, and cracks.
After the operator removed the heated front from the heating
tunnel, he or she removed the plastic protective caps from the
hinges with a decapper or pliers, placed the front on the metal
stretcher plate located on a pneumatic stretcher machine, and
activated the machine that compressed a top plate down on to the
stretcher plate, thereby stretching the eye cavities on the front
and partially forming the headcurve of the front. The operator
removed the front from the stretcher plate, manipulated the
lenses into the eye cavities, manipulated the front to form the
proper headcurve for the SKU being assembled, measured the
headcurve using a headcurve chart, examined the fronts for
distortions, and checked for and corrected any lens gaps or other
defects. The operator was required to complete the lensing
process before the front cooled down.
Prior to attaching the plastic temples to the fronts, the
operator was required to use a mitring machine to cut plastic
from the front end of the temples so as to create an angle that
conformed to the angle of the front.26 The operator adjusted the
cutting blade of the mitring machine, inserted and aligned a
25 The plaque is the metal piece on the plastic front. It
appears sunken when the plastic around the metal becomes so hot
that it swells and covers the plaque.
26 B&L and we refer to the process of cutting the temples with a
mitring machine as mitring.
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