A device for producing dyed plastic granulate and undyed plastic granulate includes a multi-shaft screw extruder and an underwater pelletizing installation. A granulate changeover unit which separates the dyed plastic granulate from the undyed plastic granulate is disposed in a conveying direction downstream of the underwater pelletizing installation. The dyed plastic granulate is separated from the pelletizing water via a first separator installation, and the undyed plastic granulate is separated from the pelletizing water via a second separator installation. The separator installations are disposed so as to be mutually parallel. The device enables a simple, flexible and economical selective production of the dyed plastic granulate and the undyed plastic granulate.

An apparatus (10) for producing reshaped plastic granules from a plurality of initial granules (12) with a predetermined shape is disclosed comprising: a feeding unit (20) for continuously receiving a plurality of said initial granules (12), a pressing unit (30) for mechanically reshaping the initial granules, said pressing unit comprising at least two opposite pressing surfaces (32) with a gap (34) therebetween, the width (W) of said gap ranging from 0 mm to 0.5 mm, a receiving chamber (40) for receiving the reshaped final granules (13) from the pressing unit, and a frame (50) for supporting the feeding unit, the pressing unit and the receiving chamber. A method is also provided to produce final granules by mechanically reshaping the initial granule, each final granule having a certain surface-to-volume ratio and a primary thickness of at most 0.7 mm within substantially the entire volume of the final granules.

An apparatus (10) for producing reshaped plastic granules from a plurality of initial granules (12) with a predetermined shape is disclosed comprising: a feeding unit (20) for continuously receiving a plurality of said initial granules (12), a pressing unit (30) for mechanically reshaping the initial granules, said pressing unit comprising at least two opposite pressing surfaces (32) with a gap (34) therebetween, the width (W) of said gap ranging from 0 mm to 0.5 mm, a receiving chamber (40) for receiving the reshaped final granules (13) from the pressing unit, and a frame (50) for supporting the feeding unit, the pressing unit and the receiving chamber. A method is also provided to produce final granules by mechanically reshaping the initial granule, each final granule having a certain surface-to-volume ratio and a primary thickness of at most 0.7 mm within substantially the entire volume of the final granules.

The invention relates to a method for drying a wet polymer composition obtained from a polymerization process, comprising: a) introducing the wet polymer composition and a drying gas into a fluidized bed dryer to form a fluidized bed of the wet polymer composition and b) heating the fluidized bed to obtain a dry polymer composition, wherein the fluidized bed further comprises an anti-fouling agent comprising inert nanoparticles.

The invention relates to a method for drying a wet polymer composition obtained from a polymerization process, comprising: a) introducing the wet polymer composition and a drying gas into a fluidized bed dryer to form a fluidized bed of the wet polymer composition and b) heating the fluidized bed to obtain a dry polymer composition, wherein the fluidized bed further comprises an anti-fouling agent comprising inert nanoparticles.

Process for hydraulic conveying of polyolefin pellets comprising the steps of: (i) extruding molten polyolefin into strands and cutting the strands into pellets in an underwater pelletiser (A); (ii) withdrawing a first pellet suspension stream (1.1) from the pelletiser; (iii) concentrating the first pellet suspension stream in a first pellet separator (B); (iv) passing the concentrated pellet stream (1.4) to a hydraulic conveying line through a first vessel (D) and mixing it with water thereby producing a second pellet suspension stream (1.5); (v) withdrawing the second pellet suspension stream from the first vessel and passing it to a second pellet separator (E); (vi) separating the pellets from water in the second pellet separator thereby creating a second water stream (1.6) and a dry pellet stream (1.10) and passing the second water stream back to the first vessel; wherein any one of the first or second pellet suspension stream or the dry pellet stream comprises an antiblock.

Process for hydraulic conveying of polyolefin pellets comprising the steps of: (i) extruding molten polyolefin into strands and cutting the strands into pellets in an underwater pelletiser (A); (ii) withdrawing a first pellet suspension stream (1.1) from the pelletiser; (iii) concentrating the first pellet suspension stream in a first pellet separator (B); (iv) passing the concentrated pellet stream (1.4) to a hydraulic conveying line through a first vessel (D) and mixing it with water thereby producing a second pellet suspension stream (1.5); (v) withdrawing the second pellet suspension stream from the first vessel and passing it to a second pellet separator (E); (vi) separating the pellets from water in the second pellet separator thereby creating a second water stream (1.6) and a dry pellet stream (1.10) and passing the second water stream back to the first vessel; wherein any one of the first or second pellet suspension stream or the dry pellet stream comprises an antiblock.

A rotary vacuum drum drying system is described. The system may include a plurality of sensors and a control system operatively coupled with the plurality of sensors. The control system includes a processing device to monitor a plurality of parameters of the vacuum drying system received from the plurality of sensors and automatically adjust one or more of the plurality of parameters based on the monitor of the plurality of parameters.

A solidifying device is for solidifying a substrate which includes a middle and two side portions. The thermostability of the middle portion is greater than that of the side portions. The solidifying device includes a housing, a heating member, a temperature control air-floating member and a conveyor. The housing defines a working space. The heating member is in the working space. The substrate has a heat receiving surface facing the heating member. The temperature control air-floating member is in the working space and below the heating member. The conveyor is for transporting the substrate into the working space and between the temperature control air-floating member and the heating member. The heating member is for providing heat to the substrate. The temperature control air-floating member is for supplying air towards the substrate to allow the substrate to float in the working space and form a high-temperature and two low-temperature areas.

The invention relates to a method for drying salts with a water of crystallisation content in convective apparatuses that can additionally be indirectly heated. The invention is primarily characterised in that the drying process takes place with a moisture content of the drying gas above a determined level. The gas surrounding the salt particles during the drying process therefore has a specific humidity. In this way, the rate of drying is positively influenced.