Microlayer foam/solid sheet structures.Coextruding sheet with alternating microlayers of solid and foamed plastic reduces foam cell foam cell n. A cell containing lipids in small vacuoles, as seen in leprosy and xanthoma, often a histiocyte. size dramatically without increasing the density. Alternating layers also allow the sheet to be made thinner without sacrificing tensile strength tensile strength Ratio of the maximum load a material can support without fracture when being stretched to the original area of a cross section of the material. When stresses less than the tensile strength are removed, a material completely or partially returns to its . Those are two conclusions of joint R&D by Dow Chemical Co., Midland, Mich., and Case Western Reserve University, Cleveland. Sheet structures made using a series of layer multipliers in the feedblock have cell sizes of 100 microns with 32 layers and cells as small as 10 microns with 64 layers. Depending on the resin resin, any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing used, microlayered foam/solid sheet can resemble cork cork, in botany cork, protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem, bark). in compressive strength Compressive strength is the capacity of a material to withstand axially directed pushing forces. When the limit of compressive strength is reached, materials are crushed. Concrete can be made to have high compressive strength, e.g. and can be stiff for thermoformed packaging or soft and elastomeric for fabric replacement. The researchers have made coextrusions 0.5 to 4 mm thick and up to 600 mm wide. Materials include foamed and solid PE and foamed PP with solid PE. Work is continuing on systems with improved barrier properties. Dow: (979) 238-4246 * www.dow.com [ILLUSTRATION OMITTED] |
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