Feed screw arrangement

A grinder comprising a pair of opposed grinding surfaces and including a feed screw for feeding lignocellulosic material to said grinder, said feed screw including an outer cylindrical pipe whereby said feed screw is disposed within said outer cylindrical pipe, said feed screw including said outer cylindrical pipe disposed extending through the center of one of said pair of opposed grinding surfaces and into a feed zone between said pair of opposed grinding surfaces, said feed screw including at least one peripheral thread for feeding said lignocellulosic material axially along said feed screw toward said feeding zone between said pair of opposed grinding surfaces, said at least one peripheral thread including an upstream end and a downstream end corresponding to the feeding zone between said pair of opposed grinding surfaces, said downstream end of said at least one peripheral thread including an angled end member disposed at an angle with respect to said at least one peripheral thread whereby said lignocellulosic material is redirected in a radially direction into said feeding zone.

A feed screw for feeding lignocellulosic material to a rotary disc refiner comprising a pair of opposed grinding surfaces, said feed screw comprising at least one peripheral thread for feeding said lignocellulosic material axially along said feed screw towards said rotary disc refiner, said at least one peripheral thread including an upstream end and a downstream end corresponding to the pair of opposed grinding surfaces whereby said feed screw feeds said lignocellulosic material from said upstream end toward said downstream end through the center of one of said pair of opposed grinding surfaces, said downstream end of said at least one peripheral thread including an angled end member disposed at an angle with respect to said at least one peripheral thread whereby said lignocellulosic material is re-directed in a radial direction as it leaves said at least one peripheral thread, and wherein said angled end member includes at least one lateral rim preventing said lignocellulosic material from slipping sideways with respect to said angled end member.

A feed screw for feeding lignocellulosic material to a rotary disc refiner comprising a pair of opposed grinding surfaces, said feed screw comprising a pair of peripheral threads for feeding said lignocellulosic material axially along said feed screw towards said rotary disc refiner, each of said pair of peripheral threads including an upstream end and a downstream end corresponding to the pair of opposed grinding surfaces whereby said feed screw feeds said lignocellulosic material from said upstream end toward said downstream end through the center of one of said pair of opposed grinding surfaces, said downstream end of each of said pair of peripheral threads including an angled end member disposed at an angle with respect to each of said pair of peripheral threads whereby said lignocellulosic material is re-directed in a radial direction as it leaves each of said pair of peripheral threads.

A feed screw for feeding lignocellulosic material to a rotary disc refiner comprising an outer cylindrical pipe, said feed screw being disposed within said outer cylindrical pipe, said rotary disc refiner comprising a pair of opposed grinding surfaces, said feed screw comprising at least one peripheral thread for feeding said lignocellulosic material axially along said feed screw towards said rotary disc refiner, said at least one peripheral thread including an upstream end and a downstream end corresponding to the pair of opposed grinding surfaces whereby said feed screw feeds said lignocellulosic material from said upstream end toward said downstream end through the center of one of said pair of opposed grinding surfaces, said downstream end of said at least one peripheral thread including an angled end member disposed at an angle with respect to said at least one peripheral thread whereby said lignocellulosic material is re-directed in a radial direction as it leaves said at least one peripheral thread.