问题描述：
英语翻译
There are many different types and manufacturers of auto-sort technologies on the market today,
but they can be classified into three basic types.These technologies employ some type of
detection signal that can differentiate plastic bottles based on chemical or physical characteristics
when that signal is detected and analyzed by a sensor.
The first type of auto-sortation is through optical sensoring.Optical sorting systems use
visible light to separate plastic bottles by color.The second type are systems based on
“transmission technologies” whereby a signal passes directly through the bottle and is
read by a sensor on the other side of the bottle.Each plastic resin has a characteristic
response to the signal based on its unique chemical composition.The third type are
surface scanning devices where the signals bounce off the surface of the bottle and are
reflected back to the sensor for identification.Similarly,each plastic resin type has its
own unique response.When a sensor detects what it is looking for,it will generally
activate an air jet that will eject or direct the item it has positively identified.The major
sortation technologies in use today include optical,X-ray transmission (XRT),X-ray
fluorescence (XRF),and near-infrared (NIR).
Some auto-sort technologies are capable of multiple sorts,by both resin type and color,
while some are known as “binary-sort” systems -- namely those that identify just one
item and separate it from a stream of bottles.The first generation of auto-sort
technologies were binary-sort systems primarily developed to provide reliable separation
of two visually similar,yet highly incompatible plastics from a recycling perspective --
namely PVC and PET.As has been discussed,PVC is a major contaminant in PET
recycling even at very low concentrations.
The current state-of-the-art in auto-sort technology combines several types of sensors to
provide multiple sorting functions for streams of commingled plastic resin types.For
example,one commercial system uses an XRT sensor to separate PVC bottles,then an
infrared sensor that separates bottles into clear,translucent and opaque categories,
followed by optical sensors that sort bottles by color,and finally an NIR sensor to
separate the bottles by resin category.
There are many different types and manufacturers of auto-sort technologies on the market today,
but they can be classified into three basic types.These technologies employ some type of
detection signal that can differentiate plastic bottles based on chemical or physical characteristics
when that signal is detected and analyzed by a sensor.
The first type of auto-sortation is through optical sensoring.Optical sorting systems use
visible light to separate plastic bottles by color.The second type are systems based on
“transmission technologies” whereby a signal passes directly through the bottle and is
read by a sensor on the other side of the bottle.Each plastic resin has a characteristic
response to the signal based on its unique chemical composition.The third type are
surface scanning devices where the signals bounce off the surface of the bottle and are
reflected back to the sensor for identification.Similarly,each plastic resin type has its
own unique response.When a sensor detects what it is looking for,it will generally
activate an air jet that will eject or direct the item it has positively identified.The major
sortation technologies in use today include optical,X-ray transmission (XRT),X-ray
fluorescence (XRF),and near-infrared (NIR).
Some auto-sort technologies are capable of multiple sorts,by both resin type and color,
while some are known as “binary-sort” systems -- namely those that identify just one
item and separate it from a stream of bottles.The first generation of auto-sort
technologies were binary-sort systems primarily developed to provide reliable separation
of two visually similar,yet highly incompatible plastics from a recycling perspective --
namely PVC and PET.As has been discussed,PVC is a major contaminant in PET
recycling even at very low concentrations.
The current state-of-the-art in auto-sort technology combines several types of sensors to
provide multiple sorting functions for streams of commingled plastic resin types.For
example,one commercial system uses an XRT sensor to separate PVC bottles,then an
infrared sensor that separates bottles into clear,translucent and opaque categories,
followed by optical sensors that sort bottles by color,and finally an NIR sensor to
separate the bottles by resin category.
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