General characteristics, task details:Is the most important region in the HR system.Control function of the nozzle head.Classified into form of heat van or van.Nozzle controls related to both the control of hot asphalt and time line close open mouth spray.Technical requirements:+ Against freezing and interrupts the flow of plastic.+ No spinning or drip.+ The smallest pressure Loss.+ Dead flow area is the smallest.+ Leave traces of mouth spray on products is the smallest
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