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US 4,789,511 AGranted
Material processing
AssigneeThe University of Manchester Institute of Science and Technology
InventorSitki Bilgin
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AssigneeThe University of Manchester Institute of Science and Technology
InventorSitki Bilgin
Estimating the term…
A method of materials processing (e.g. polymer extrusion) in which the material flows along an axially extending passageway. A pressure differential is established across the passageway transverse to the axial flow direction so as to create a flow of material through the die which has a velocity component transverse to the axial flow direction. Preferably the pressure differential transverse to the extrusion direction is continuous thereby estabilshing a continuous change of velocity component transverse to the axial flow direction. Preferably also there is at least one reversal of transverse pressure differential (and hence transverse velocity component). Apparatus for performing this method comprises for example, successive sections (3-5) of identical trapezoidal cross section with adjacent ones of these sections having their cross-sections displaced through 180.degree. relative to each other.
A method of materials processing in which the material flows along an axially extending passageway with successive upstream and downstream sections wherein the cross-section (as viewed in the plane transverse to the flow direction) of the inlet to the downstream section has first and second end regions between which the length (as viewed in said cross-section) of the channel extends and this cross-section increases progressively in depth from the first end region to the second end region thereof, and said first and second end regions are respectively of lesser and greater depth than the adjacent end region of the outlet of the upstream section, whereby a pressure differential is established in said sections so as to create therein a flow of material having a velocity component transverse to the flow direction.
Material processing apparatus having an axially extending flow passageway with successive upstream and downstream sections wherein the cross-section (as viewed in the plane transverse to the flow direction) of the inlet to the downstream section has first and second end regions between which the length (as viewed in said cross-section) of the channel extends and this cross-section increases progressively in depth from the first end region thereof to the second end region thereof, and said first and second end regions are respectively of lesser and greater depth than the adjacent end regions of the outlet of the upstream section whereby, in use of the apparatus, there is established in the downstream section a pressure differential transverse to the axial flow direction so as to create a material with a velocity component transverse to the flow direction.
Dependencies are inferred from the claim text.