In general, owning the advantage of combining separate features of different individual polymers together in a facile way, technology of coextrusion
has been widely used to fabricate multilayered composite sheets or films for various applications ranging from food packaging products to optical reflective films .
and 13 foreign countries and authored more than 50 technical articles and papers for innovations in extrusion, coextrusion
, barrier packaging, die design, and calendering.
Another recent development is the AB coextrusion
die which gives a 4:1 blow-up/stretch ratio and D-S says requires fewer blowing agents to achieve a high-density product.
The company says, "The key to the improvements is special tooling developed by EDI to implement a coextrusion
process designed and patented by The Dow Chemical Company.
Abstract: The invention concerns a yam comprising a core (A) obtained by coextrusion
of a glass multifilament E, R, C or S, or more generally of glass silk or basalt, and a polymer sheath of the thermoplastic, thermoset, natural elastomer fluorinated or non-fluorinated synthetic elastomer type.
2002 TAPPI Film Extrusion and Coextrusion
systems from Macro Engineering & Technology, Mississauga, Ont., feature a more compact extruder design with a small footprint that allows more space in the extrusion area and simplifies installation.
The concept behind the original design, based on Dow Chemical technology, was that by dividing a coextrusion
melt stream across its width and re-combining those new streams as a stack a film could be produced with many layers but without increasing its overall thickness.
(AMC) has introduced a coextrusion
tooling system for hollow, solid, symmetrical, and asymmetrical profile cross sections for interior and exterior applications.
Until now, injection molders and firms making co-extruded products were mostly limited in their choices to between 50 and 70 durometer A hardness when seeking a soft TPE alloy for two-shot molding (overmolding onto engineering plastics, including ABS, PC, ABS/ PC, ASA, nylon 6, nylon 66, COPA, COPE and TPU substrates) and coextrusion
, according to the company.
of two polymers through a single manifold flat die is examined.