Filter package

For the estimation of Chi formation in hairy roots, the root cells were examined on a laser scanning confocal image system attached to a microscope. The filter package with a laser (excitation 568 nm) and a 590-610 nm band pass barrier filter for red fluorescence was employed. Digital image analysis was performed by a computer-aided image processing system with software. 

Oil from expeUer is filtered, packaged under nitrogen or other neutral gas into bottles protecting from light exposure, and ready for distribution. Flax oil is very susceptible to oxidative deterioration, and treatment to eliminate oxygen needs to be applied. On the North American continent, flax oil is considered as a health food oil. 

A. J. Smith, J. J. Quinn, and P. J. Hardy, The Development of an Aerated Filter Package Plant, in Int. Conf. Advances in Water Treat, and Environ. Man., Lyon, France, June 27-29, 1990. 

Open the sterile filter package, but leave the filter in the plastic ... 

Carefully open filter package and, using aseptic techniques, place sterile filter membrane (grid side up) onto the sterile filter housing, taking care not to create wrinkles in membrane during closure. 

Filter classifications are marked on the filter or filter package. These classifications are N-Series Not Oil Resistant (approved for non-oil particulate contaminants such as dust, fumes, or mists not containing oil) R-Series Oil Resistant (approved for all particulate contaminants, including those containing oil such as dusts, mists, or fumes—time restriction of 8 hours when oils are present) and P-Series Oil Proof (approved for all particulate contaminants including those containing oil such as dust, fumes, or mists). (See manufacturer s time use restrictions on packaging.)... 

The spinning assembly can be round or rectangular. It contains a filter package on top of a supporting/distribution plate. The spinning plate is the bottom of the spinning assembly. 

Filter packages are usually a stack of screens, going from coarse to fine in the streamline direction, on top of a support plate with holes for further distribution of the flow. Screens are plain-weave, or sometimes twill-weave, steel wire fabrics. Their fineness is indicated in mesh (threads per inch), openings per cm, or pore size in microns. For example, 325 mesh = 16 800 opening s cm 40 pm. 500 mesh (25 pm) filtration is common in melt spinning. For even finer filtration, steel nonwoven materials are used, with a filter fineness going down to 5 pm. 

The pressure drop over the filter package would add 30-50 bar, resulting in an initial pressure drop over the spinning assembly of 60-85 bar. The pressure drop over the filter does increase during the lifetime of the spinning assembly. The assembly would be taken out of the machine at 200-250 bar. 

---