Abstract: In consideration of increasing throughput rate of a stable operating process as well as making the process energy-efficient, the aim is to optimise a fluidised bed opposed jet mill and a dedicated process to produce ultrafine particles from a feed material of low bulk density with a housing in vertical design, with a product feed point and a product discharge, with a grinding zone located in the lower area of the housing which has grinding nozzles spaced evenly around the circumference whose jets intersect at one central point and with a classifying device installed in the upper area of the housing. This is achieved by the feed material dosed to the mill from the bottom into the mill sump as a gas-particle mixture, whereby a deflector hood is located above the feed point and below the grinding nozzle level, and the grinding gas nozzles designed to be flush with the walls.

Abstract: The thickness profile of a film tube manufactured using a film blowing process is regulated using a control system consisting of segmented control zones and at least at two measuring units for the film thickness such that the specified target film thickness profile exhibits deviations from a uniform film thickness in the form of one or two thin spots opposite each other, which serve to compensate for film thickness changes across the film width which occur during the monoaxial orientation in machine direction so that a film web is produced as a result of orientation whose thickness profile has as few deviations as possible from the target thickness across the entire width of the film web, the final film should exhibit a thickness profile where the thickness increase from the middle of the film to the edges is as minor as possible and the flatness of the film is improved.

Abstract: In the case of a die head and a process to produce multilayer tubular film made from thermoplastic polymers, the advantages of radial distributors and axial distributors should be combined. This is achieved in that at least one distributor is a plate distributor and at least one distributor is an axial distributor, whereby the plate distributor is located in an annular element of the axial distributor upstream of the melt merge zone to the ring-shaped die.

Abstract: A device and method for the production of a tubular film in a blown film method with a blown film line. It includes a lay-flat device and a takeoff device with a pair of take-off rolls, in which the tubular film can be laid flat, and at least one venting device of the previously flattened tubular film. The deaerating device includes a movement device for a cutting device with cutting elements and is arranged in the transport direction of the flattened tubular film downstream of the pair of take-off rolls so that the flattened tubular film can be slit and deaerated by the deaerating device.

Abstract: A device for winding and changing reels of web material includes two independently operable central drives for shifting winding shafts, a drivable winding shaft guide, a contact roller unit and slitting units. Both right-hand winding and left-hand winding are realized, whereby the device is without a prewinding station. For a winding shaft change, the drivable winding shaft guide is driven from the winding position into the parking position and is disconnected. Subsequently, the second central drive is connected to the winding shaft guide and is driven from its parking position into the winding position where the second central drive is connected with a new winding shaft. The contact roller unit is driven against the winding shaft and the web material is cut through by a slitting device and then wound to a new reel.

Abstract: In consideration of increasing throughput rate of a stable operating process as well as making the process energy-efficient, the aim is to optimise a fluidised bed opposed jet mill and a dedicated process to produce ultrafine particles from a feed material of low bulk density with a housing in vertical design, with a product feed point and a product discharge, with a grinding zone located in the lower area of the housing which has grinding nozzles spaced evenly around the circumference whose jets intersect at one central point and with a classifying device installed in the upper area of the housing. This is achieved by the feed material dosed to the mill from the bottom into the mill sump as a gas-particle mixture, whereby a deflector hood is located above the feed point and below the grinding nozzle level, and the grinding gas nozzles designed to be flush with the walls.

Abstract: In the case of a device to permit the monoaxial length change of film webs in machine direction, which comprises at least one processing gap delimited by two rolls via which a film web is routed in machine direction, whereby the first roll in film transport direction exhibits a first peripheral speed and the second roll in film transport direction exhibits a second peripheral speed, in order to produce film webs with low transverse neck-in as well as reduced edge build-up and to improve the flatness of the film web.

Abstract: A device for winding and changing reels of web material includes two independently operable central drives for shifting winding shafts, a drivable winding shaft guide, a contact roller unit and slitting units. Both right-hand winding and left-hand winding are realized, whereby the device is without a prewinding station. For a winding shaft change, the drivable winding shaft guide is driven from the winding position into the parking position and is disconnected. Subsequently, the second central drive is connected to the winding shaft guide and is driven from its parking position into the winding position where the second central drive is connected with a new winding shaft. The contact roller unit is driven against the winding shaft and the web material is cut through by a slitting device and then wound to a new reel.

Abstract: In the case of a die head and a process to produce multilayer tubular film made from thermoplastic polymers, the advantages of radial distributors and axial distributors should be combined. This is achieved in that at least one distributor is a plate distributor and at least one distributor is an axial distributor, whereby the plate distributor is located in an annular element of the axial distributor upstream of the melt merge zone to the ring-shaped die.

Abstract: A classifying wheel for a centrifugal-force air classifier where the flow pattern of the classifying air is contrary to its centrifugal direction, namely centripetal, and which is equipped with extensions fitted to the classifying wheel vanes within the flow channels which influence the flow pattern is to be executed in wear-protected design. This is achieved in that the classifying wheel has at least one reinforcing ring which has uniformly spaced hooks arranged around its periphery which fix the classifying wheel vanes to the extensions so that the outside radial edge of the classifying wheel vanes is not in contact with the reinforcing ring.

Abstract: An internal cooling tower for a film blowing line with one or more superimposed cooling air nozzles designed such that the entrainment of droplets consisting of low-molecular components of the raw material that diffuse during the film blowing process from the film into the flow of cooling air is prevented. This is achieved in that at the height of the nozzle gap, the top surface of the cooling air nozzles has a grooved contour both on the inside and the outside.

Abstract: A classifying wheel for a centrifugal-force air classifier where the flow pattern of the classifying air is contrary to its centrifugal direction, namely centripetal, and which is equipped with extensions fitted to the classifying wheel vanes within the flow channels which influence the flow pattern is to be executed in wear-protected design. This is achieved in that the classifying wheel has at least one reinforcing ring which has uniformly spaced hooks arranged around its periphery which fix the classifying wheel vanes to the extensions so that the outside radial edge of the classifying wheel vanes is not in contact with the reinforcing ring.

Abstract: An internal cooling tower for a film blowing line with one or more superimposed cooling air nozzles designed such that the entrainment of droplets consisting of low-molecular components of the raw material that diffuse during the film blowing process from the film into the flow of cooling air is prevented. This is achieved in that at the height of the nozzle gap, the top surface of the cooling air nozzles has a grooved contour both on the inside and the outside.

Abstract: The invention relates to a process to regulate the film thickness of tubular film manufactured using a film blowing process, wherein the film is laid flat and repositioned using an oscillating take-off unit and subsequently monoaxially oriented in machine direction using an orientation unit. This process produces a film whose thickness profile has as few deviations as possible from the average film thickness across the film width. This result is achieved by setting the film thickness profile of tubular film produced with a film blowing line such that after orientation and as a result of deviations during orientation, a film thickness profile develops that is uniform across the entire film width.

Abstract: The disclosure relates to a sieve mill including a basket having a curved inner side for supporting a sieve which rests on the curved inner side of the sieve basket, and two longitudinal edges which are parallel and opposite each other, a material inlet arranged above the sieve and a cylindrical rotor arranged such that it can rotate inside the sieve basket. A longitudinal edge of the sieve is arranged in a first retaining bar having a first positioning recess for receiving the longitudinal edge, and another longitudinal edge is arranged in a second retaining bar having a second positioning recess for receiving the other longitudinal edge, the second retaining bar can pivot between an open position in which the second positioning recess can withdraw and feed the associated longitudinal edge, and a closed position in which the second positioning recess exerts pressure upon the longitudinal edge.

Abstract: The invention relates to an air jet sieve device having a housing, at least one sieve for insertion in the housing, a sieve deck and chamber located below the sieve, a slotted nozzle beneath the sieve deck, a drive for the slotted nozzle, an air inlet to the slotted nozzle, an air outlet through the housing and out of the chamber located beneath the sieve deck, and a control unit to control operation of the device. The invention also relates to a method that permits not only detection of the sieving progress during a sieving process but also provides a criterion to permit establishing the sieving time. This is achieved by equipping the sieving machine with a measuring sensor through which the particles in the air outlet flow are detected triboelectrically and which are correlated with the sieving progress to permit establishing the sieving time.

Abstract: The invention concerns an impact mill suitable for installation in a container. To this end, the container must have an opening, e.g. a manhole with flange. The mill is designed as a complete and independent module without a separate mill housing, all functional components are mounted on a plate which is flanged onto the manhole.

Abstract: A system for process-technological machines such as mills and classifiers having an enclosed design with no rotary unions between the ambient air and system interior. This system is particularly useful for CIP and SIP operation modes or glove-box operations. The mills or classifiers include an encapsulation that seals the components of the magnetic bearing spindle drive against the working zone of the shaft in the magnetic bearing spindle housing. The magnetic bearing spindle drive is designed such that the shaft can be removed to facilitate simpler and easier component exchange as well as thorough cleaning.

Abstract: The invention relates to a blow head for producing blown tubular films from thermoplastic materials. Films produced by conventional blow heads often have dull strips or wavy areas, the so-called spiral strips. The aim of the invention is to avoid these negative film properties. For this purpose, the blow head comprises a plurality of annular gap-shaped melt channels arranged concentrically around the center axis of the blow head, the spiral distributor of the inner melt channel being arranged on the inner limiting wall in relation to the center axis of the blow head and the spiral distributor of the outer melt channel being arranged on the outer limiting wall in relation to the center axis of the blow head.

Abstract: Fluidized-bed opposed jet mills, configured as separator mills, and provided with easy accessibility so that the interior space can be easily cleaned with little effort. The separator wheel is formed together with the bearing unit and the actuator unit as one component, which is detachably attached to the grinding container and can be moved relative to the grinding container by kinematic devices in such a manner that the separator wheel can be removed from the grinding container upward through the discharge outlet for finely ground material, while the discharge device for the finely ground material remains connected to the grinding container. In this manner, the separator mill can be easily assembled and disassembled by the user and the separator mill becomes easily accessible for thorough cleaning. This is particularly advantageous when the material to be ground is changed frequently, as is the case in the pharmaceutical and chemical fields.