Composites Extrusion
Polymeric composites may be extruded. (RDC 10/3/2011)
Orienting short fiber mixed in rubber or synthetic resin by extrusion involves an expansion die with a sectionally annular mold opening. The die consists of an inlet opening, a middle opening (expanded portion), and an outlet opening. A sectional area of the outlet opening is formed larger than that of the inlet opening, a flow passage width of the inlet portion is smaller than that of the outlet portion, the flow passage width of the outlet portion is less than that of the middle opening, and the middle opening is provided with an expansion opening portion having an expanded flow passage width.
“When rubber or synthetic resin mixed with short fiber is extruded from this expansion die for extrusion molding, the orientation rate of the short fiber in the circumferential direction and the radius direction in the middle opening increases so that a cylindrical body is formed in which short fibers are oriented at a predetermined rate in the extrusion direction and in the circumferential direction and the radius direction, respectively.”
Recent US Patents
9/27/2011
8,025,497
Method for manufacturing short fiber oriented rubber or synthetic resine and expansion die for extrusion molding
Umeda of Bando Kagaku Kabushiki Kaisha, Japan,extruded rubber or synthetic resin mixed with short fibers from a sectionally annular mold opening, and molding a cylindrical body of rubber or synthetic resin with short fibers oriented in a predetermined direction. The mold opening has an expansion portion whose diameter expands in an extrusion direction, and a flow passage of an inlet portion 6i of the mold opening, a flow passage of an outlet which can be adjusted to change the short fiber orientation. (RDC 9/29/2011)
9/20/2011
8,021,588
Processes for forming a fiber-reinforced product
Gleich, Johnson and Swann of Johns Manville, Missouri, developed a roofing material by extruding a matrix with fibers by forming a first layer. adding fibers to the first layer and forming a second layer on the fibers. (RDC 9/23/2011)