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US4322380: Method for feeding and orienting fibrous furnish

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Filing Information

Inventor(s) Joseph S. Bleymaier · Wilfred Farnworth · Thomas E. Peters ·
Assignee(s) Morrison-Knudsen Forest Products Company, Inc. ·
Attorney/Agent(s) O'Neil and Baker Shanley ·
Primary Examiner Willard E. Hoag ·
Application Number US6197178
Filing date 10/15/1980
Issue date 03/30/1982
Predicted expiration date 03/30/1999
U.S. Classifications 264/438  · 198/532  · 19/144  · 19/296  · 156/62.2  · 264/109  · 264/40.1  · 264/460  ·
International Classifications B29J 500  ·
Kind CodeA
International Classifications 19302;304;144;296 ·
Related U.S. Application DataThis is a division of application Ser. No. 004858, filed Jan. 19, 1979, now U.S. Pat. No. 4,255,108, the entire disclosure of which is incorporated herein by reference.
14 Claims, No Drawings


Abstract

Methods are presented for continuous-line manufacture of composition board from furnish which is moved in a continuous-flow manner through a processing line and distributed for deposition at a uniform rate over a preselected area to continuously form a mat for compaction. Commercially economical production flow rates are achieved with a lightweight refined wood furnish to form fiberboard having directional properties without relying on pneumatic impulsion while uniformly distributed furnish is delivered substantially free of air turbulence effects enabling fiber orientation by means of an electrical field. Control of movement and accurate metering of furnish are facilitated by continuously over-feeding furnish into the processing line and returning excess furnish as part of an initial distribution of furnish over one dimension of the mat to be formed. The initially distributed furnish is confined in the remaining dimension while being continuously moved in the direction of the mat; the confined profile feed is metered, accelerated by mechanical contact, and then distributed over the full area of deposition. Lightweight fibrous furnish is delivered for screening to separate fiber clusters followed by electrical field orientation of individualized fibers and deposition. The furnish distributed over the forming area is moved along a flow path which is substantially normal to the surface of deposition.

Independent Claims | See all claims (14)

  1. 1. In continuous-line manufacture of fiberboard, a method providing for uninterrupted movement of lightweight comminuted furnish through a forming line without relying on pneumatic impulsion and uniformly distributing such furnish for electric field orientation and delivery over a preselected area to continuously form a mat of such fibrous furnish, comprisingproviding a lightweight, comminuted, fibrous furnish including elongated, fine-textured fibers,providing a forming line including means for feeding furnish into the forming line located in vertically spaced relationship from a conveyor means for deposition of furnish to form a mat, with the forward direction of movement for furnish in the forming line being from the means for feeding furnish into the forming line toward the conveyor means,such conveyor means presenting a mat support web,controllably moving such web to present a surface of preselected area for deposition of furnish, such web movement establishing a forming direction for the mat being formed by deposition of furnish,such preselected area of deposition establishing a dimension in the forming direction and a dimension perpendicularly transverse to the forming direction,continuously feeding such fibrous furnish into the forming line,moving such furnish including an excess through a distributor disposed to move such furnishtransversely to the forward direction of movement of furnish to distribute such furnish substantially uniformly over one dimension of the preselected area of deposition while returning excess furnish for recycling,delivering furnish in the forward direction,passing the furnish distributed over such one dimension of the selected area of deposition through a flow-through header chamber so as to maintain a substantially uniform head of furnish in such header chamber,confining such furnish to a fractional portion of the remaining dimension of the preselected area of deposition,controllably metering removal of furnish from such header chamber in the forward direction by continuously removing furnish from such header chamber,uniformly distributing such controllably metered furnish removed from such header chamber over the remaining dimension of the preselected area of deposition,such distribution over the remaining dimension being substantially free of pneumatic impulsion,delivering such furnish uniformly distributed over substantially the full selected area of deposition toward the support web along a flow path having a direction which is substantially normal to the surface of deposition, anddirecting such furnish as uniformly distributed over the full area of deposition into an electric field orientation chamber means for orientation and deposition on the moving web.
  2. 14.14. In continuous-line manufacture of fiberboard, a method providing for uninterrupted movement of lightweight comminuted fibrous furnish through a forming line at a substantially constant rate free of pneumatic impulsion and uniformly distributing such furnish for delivery over a preselected area substantially free of turbulence effects enabling fiber orientation in an electric field to continuously form a mat of such fibrous furnish, comprisingproviding a lightweight, comminuted, fibrous furnish including elongated, fine-textured fibers,providing a forming line with means for feeding furnish into the forming line located in vertically spaced relationship from a conveyor for deposition of furnish to form a mat, with the forward direction of movement for furnish in the forming line being toward the conveyor,such conveyor presenting a mat support web,controllably moving such web to present a surface of preselected area for deposition of furnish, such web movement establishing a forming direction for the mat being formed by deposition of furnish,such preselected area of deposition establishing a dimension in the forming direction and a dimension perpendicularly transverse to the forming direction,continuously feeding such fibrous furnish into the forming line,moving the furnish fed into the forming line transversely to such forward direction of movement of furnish to distribute furnish substantially uniformly over one dimension of the preselected area of deposition while delivering such distributed furnish in the forward direction, maintaining a substantially uniform head of furnish in a flow-through header chamber,passing such furnish distributed over one dimension of the selected area of deposition through such header chamber while confining such furnish to a fractional portion of the remaining dimension of the preselected area of deposition,controllably metering removal of furnish from such header chamber in such forward direction by continuously removing furnish from such header chamber to establish a substantially constant weight per unit time movement of furnish in the forward direction through the forming line,mechanically contacting such metered furnish to controllably direct such furnish in the forward direction substantially free of pneumatic impulsion, then,uniformly distributing such furnish over the remaining dimension of the preselected area of deposition,such distribution out the remaining dimension being free of pneumatic impulsion while imparting a component of movement to the furnish in a direction transverse to its forward direction of movement,delivering furnish uniformly distributed over substantially the full selected area of deposition toward the support web along a flow path having a direction substantially normal to the surface of deposition at a velocity providing for desired orientation in an electrical field, anddirecting such furnish as uniformly distributed over the full area of deposition into an electrical field for orientation and deposition on the moving web.

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