Sampling of Powder during Fluid Bed Agglomeration

28-12-2013 11:13, af Anders HallströmSend to a colleague Send to a colleague

An investigation was made of sampling during agglomeration of milk powder in a laboratory-scale batch fluidized bed. It was found that samples taken out during the process were representative with respect to particle size and size distribution, and that the sampling itself did not influence the process. The samples were, however, not representative with respect to moisture content. This latter finding was attributed to non-homogeneous vertical distribution of moisture in the bed. (more…)

Towards a better control of dairy powder rehydration processes

26-12-2013 10:57, af Christer RosénSend to a colleague Send to a colleague

Rehydration of dairy powders have been studied by the use of a granulomorphometer, digital images of powder particles were obtained during reconstitution, and by determining particle size data by laser light scattering using a MasterSizer 2000. In best case is the reconstitution process swift and there is no remaining lumps. (more…)

Flow properties of commonly used food powders and their mixtures

26-12-2013 10:53, af Christer RosénSend to a colleague Send to a colleague

The purpose with this research work was to study the flow properties of four different commonly used powders and mixtures from these. The food powders were flour, maize semolina, sugar, cocoa and skim milk powder. The mixtures from these were: mixture 1 – wheat flour and sugar, mixture 2 – cocoa powder, sugar and skim milk powder, mixture 3 – wheat flour and sugar and mixture 4 – wheat flour, cocoa powder and sugar. (more…)

Physical and rehydration properties of milk protein concentrates: comparison of spray-dried and extrusion porosified powders

26-12-2013 10:49, af Christer RosénSend to a colleague Send to a colleague

Milk protein concentrate (MPC) powders are difficult to dissolve. These powders exhibit low solubility and dispersibility and require long time to rehydrate.  MPC powders are produced by using conventional techniques such as spray drying, drum drying or freeze drying.

In this paper is the reconstitution properties of extrusion-porosified MPC powders compared with conventional spray-dried MPC powders. (more…)

Delivery of probiotic bacteria in long life ambient stable foods using a powdered food ingredient

26-12-2013 10:44, af Christer RosénSend to a colleague Send to a colleague

In this work have the influence on probiotic bacteria been studied by using different encapsulation techniques. The shelf life of the powders in itself and as a component in intermediate moisture foods was followed. (more…)

Effects of powder flow properties and shear environment on the performance of continuous mixing of pharmaceutical powders

31-10-2013 20:21, af Christer RosénSend to a colleague Send to a colleague

In this paper are two aspects of continuous mixing of powders scrutinized; the effects of material properties on the bulk powder behaviour as well as strategies for continuous blending of cohesive materials. The effects from process parameters and materials properties were analyzed by a PLS analysis of the output parameters. (more…)

The contribution of DEM to the science of comminution

17-10-2013 09:39, af Peter Dybdahl HedeSend to a colleague Send to a colleague

The ability to model comminution techniques has been key in the mineral processing industry and other industries where size reduction of rocks is a key focus. With the need for more accurate and sophisticated models, the introduction of computational models like the discrete element method (DEM) has started to solve some of the complex problems in comminution. A new review article by Weerasekara et al. (2013) [Powder Technology, Vol. 148]  provides a general, though not exhaustive, overview of the application of computational techniques to the science of comminution. (more…)

Flight combustion of the agglomerate powders containing energy (APCE) in making new hollow multiphase ceramic microspheres by self-reactive quenching technology

17-10-2013 09:33, af Peter Dybdahl HedeSend to a colleague Send to a colleague

Al–TiO2–Fe–Fe2O3–MnO2, as the main reaction system, was selected to prepare the agglomerate powders containing energy (APCE) on 50–90 μm by balling, drying, carbonating, grinding and sieving in a recent paper by Lou et al. (2013) [Powder Technolog, vol. 250]. (more…)

Exploring a new method to study the agglomeration of powders: Application to nanopowders

17-10-2013 09:30, af Peter Dybdahl HedeSend to a colleague Send to a colleague

The increasing use of nanoparticles in the production of nanomaterials has led to the identification of nanoparticle agglomeration in air or in a given medium as a key problem, both on the standpoint of process performance (i.e. product homogeneity) and above all on inhalation risks. A recent paper by Henry et al. (2013) [Powder Technology, vol. 250  ] suggests a new method to evaluate the structure and the dynamics of agglomeration of a nanopowder, based upon monitoring of the shear stress of a powder which is submitted to the mechanical solicitation of a rheometer. (more…)

Spatially resolved monitoring of powder mixing processes via multiple NIR-probes

30-09-2013 14:04, af Christer RosénSend to a colleague Send to a colleague

In this article it is described how a blending process is followed real-time by the use multiple NIR-probes. An accurate and effective blending process is a necessity in the pharmaceutical industry. Each and every dose of a drug must contain a narrow range of active components. In this study the evolvement of the blending process were followed in a lab-scale blending vessel. The blending process could be monitored at multiple positions. Differences in homogeneity could be detected via the multiple probes that could not have been detected with a single probe system. The obtained data was interpreted by the use of a chemometric model based on partial least squares regression. By the set-up it was possible to follow blending and segregration inside the vessel by observing temporal and spatial concentration changes.

 

(Scheibelhofer, O., et al.,Powder Technology 243 (2013) 161-170, 2013)