Bead processing

Dry bead process Dry-cell batteries Dry chemistry Dry-cleaning Dry cleaning fastness Dry-cleaning fluid Dry-cleaning solvent Dryers... 

Bead Processes. These processes have generally replaced the above techniques. The styrene is polymerised by bead (suspension) polymerisation techniques. The blowing agent, typically 6% of low boiling petroleum ether fraction such as n-pentane, may be incorporated before polymerisation or used to impregnate the bead under heat and pressure in a post-polymerisation operation. 

Foamed polystyrene - which is also known as expanded polystyrene - is used extensively in a variety of applications, ranging from packaging peanuts to insulation board and single-use cups and plates. We produce it by two processes foam extrusion and bead expansion. Both types of expanded polystyrene consist of closed cells, i.e., bubbles with continuous walls. We can visually distinguish the two types of foam by the fact that products made by the expanded bead process consist of discrete beads that are welded together... 

FIG. 19-14 Batch and continuous polymerizations, (a) Polyethylene in a tubular flow reactor, up to 2 km long by 6.4-cm ID. (b) Batch process for polystyrene, (c) Batch-continuous process for polystyrene, (d) Suspension (bead) process for polyvinylchloride, (e) Emulsion process for polyvinylchloride. (Ray and Laurence,... 

In 2005, Japanese company Kaneka developed the first beads-process, foamed resin moulded product, which is based on polylactic acid. The new KanePearl product has the strength and shock-absorbing properties of existing beads-process, foamed polystyrene products. 

Bead mix 240 J,L of streptavidin coated Sepharose beads, 4560 pL of 2X binding buffer and 3600 pL of 18.2 mQ water per 96-well plate (the magnetic bead processing protocol for a PSQ96 or PSQ96MA is described elsewhere [8]). Excess Sepharose/binding buffer mix can be stored in a glass bottle at 4°C. 96-well plate shaker, e.g., Eppendorf thermomixer (Fisher Scientific, Hampton, NH). 

This protocol assumes the use of a streptavidin/Sepharose bead set-up for Pyrosequencing on a hsPSQ96 or a hsPSQ96A system. The magnetic bead processing method for the PSQ96 or PSQ96MA is described elsewhere (8). 

Yang S, Undar A, Zahn JD (2007) Continuous cytometric bead processing within a microfluidic device for bead based sensing platforms. Lab Chip 7(5) 588-595... 

Polystyrene used in injection molding is mamrfactured by the suspension bead process. Poly(methyl methacrylate) and its copolymers containing small amounts of acrylate esters are also produced by the bead suspension process. Clear transparent polymers are often required, so formulations involving Pickering dispersants (e.g., MgCOa) that can removed from the polymer with dilute acid after polymerization, are particularly advantageous. 

Shin H J, Park J M, Yang J W (1998), Continuous production of galacto-ohgosaccharides from lactose by Bullera singularis P-galactosidase immobilized in chitosan beads . Process Biochem., 33(8), lKI-191. 

Hickstein B, Peuker UA (2009) Modular process for the flexible synthesis of magnetic beads—process and product validation. J Appl Polym Sci 112 2366-2373... 

Perez-Bibbins, B., Salgado, J.M., Torrado, A., Aguilar-Uscanga, M.G., Dominguez, J.M., 2013. Culture parameters affecting xylitol production by Debaryomyces hansenii immobilized in alginate beads. Process Biochemistry 48 (3),... 

---