INNOVATION | PET
and automatically adjusts the machine parameters to achieve the desired IV at a consistent level. P:React is FDA approved for 100% food contact applications.
Above: The new PET inline preform system combines the efficiency benefits of Vacurema technology from Erema with the Xtreme preform production system of Sipa
level. P:React is therefore highly energy efficient, which results in low operating costs, says NGR. As molten PET enters the vertical part of P:React,
strands are formed to create a suitable surface to volume ratio. The material is then collected in a horizontal drum and slowly pushed forward. Condensation starts immediately as the strands are formed and continues until PET exits P:React. The IV increase is controlled by the residence time and the vacuum level of the molten PET inside P:React and therefore can be adjusted to a desired level. The setting of parameters allows the control unit to maintain the desired IV level within a small toler- ance band. The decontamination performance is claimed to be extremely effective, as it is carried out in the liquid phase of PET. The cleaning of the material exceeds limits set by recognised food safety standards.
NGR says the continuous operation of P:React
provides rPET pellets within a narrow IV range, suitable for use in high-end applications, such as fibre-spinning and sheet extrusion. Batch related IV fluctuations are eliminated. The favourable condi- tions inside P:React (temperature/surface volume ratio of the melt/high performance vacuum), easily initiates the condensation process of PET. This results in IV rate increases of around 0.01 dl/g per minute. Faster reaction leads to faster results and a more profitable operation. The separation of harmful contaminants, such as spin oils or those components not desired for food contact, are removed by the high performance vacuum. P:React actively controls the residence time of the PET melt and the vacuum inside the reactor
20 PLASTICS RECYCLING WORLD | May/June 2018
www.plasticsrecyclingworld.com
Italian company Gamma Meccanica has developed a PET recycling line able to recycle yarn, fabric, sheet and film that comprises the Compac with Ecotronic system (cutter-compactor), extruder, screen changer and a new underwater pelletiser. The Compac feeds the Ecotronic system, which prepares the material for the subsequent stages of the PET recycling process. Under temperature control, the PET is ground by rotating blades and then densified. During this phase, moisture is expelled in the form of steam. A locking screw – shorter than in previous models to give greater compactness and convenience – conveys material into the extruder. The Compac feeding system has been improved to allow easier maintenance, including a side door placed at a convenient height that allows inspec- tion of the silo and cleaning. The frame has been simplified to make assembly more practical and to optimise the introduction of material on the conveyor belt for mixed waste, roll system for film, and the batch bin for ground material. In order to ensure complete expulsion of residual moisture, the extruder has two degassing ports and one vacuum system. A screen changer is connected to the extruder to process PET. At the end of the line, there is a newly designed underwater pelletiser. Amut Group has collaborated with US PET packaging manufacturer Global Plastics and egg
P:React LSP technology from NGR
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