Multiple ply web former with divided slice chamber

• US 3,923,593 A
• Filed: 01/17/1974
• Issued: 12/02/1975
• Est. Priority Date: 12/03/1971
• Status: Expired due to Term

• Current Assignee: Herman Ward Verseput
• Original Assignee: Herman Ward Verseput
• Inventors: Verseput, Herman Ward
• Primary Examiner(s): Bashore, S. Leon
• Assistant Examiner(s): Fisher, Richard V.
• Application Number:
  US05/434,048
• Time in Patent Office: 684 Days
• Field of Search: 162/125,126,129,189,212,216,298,300,301,303,312,336,343,344,347,130,203
• US Class Current: 162/301
• CPC Class Codes: D21F 1/02 Head boxes of Fourdrinier machines
• CPC Class Codes: D21F 1/026 Details of the turbulence section
• CPC Class Codes: D21F 1/028 Details of the nozzle section
• CPC Class Codes: D21F 9/003 of the twin-wire type
• CPC Class Codes: D21F 9/006 paper or board consisting of two or more layers

Abstract

A machine for making multi-ply webs such as paper and having a traveling foraminous forming surface with a headbox having a tapered slice chamber and a slice opening delivering a stream of stock to the forming surface with the headbox and slice chamber being partitioned with the partitions being continuous across the width of the headbox and extending fully to the slice opening with the partitions in the slice chamber being trailing selfpositionable flexible elements extending fully to the slice opening and each partition having additional trailing selfpositionable flexible elements with the headbox and slice chamber being divided into three chambers in one form and long fibered stocks delivered to the outer chamber with a high ash content stock delivered to the intermediate chamber to permit dewatering of the intermediate layer without excessive loss of ash.

Claims

1. IN A MACHINE FOR MAKING A MULTI-PLY WEB SUCH AS A PAPER FROM STOCKS HAVING A SLURRY OF FIBERS IN A LIQUID CARRIER, THE COMBINATION COMPRISING:

A HEADBOX HAVING A LOWER WALL AND AN UPPER WALL;

A SLICE CHAMBER CONNECTED TO THE HEADBOX HAVING A LOWER SLICE WALL AND AN UPPER SLICE WALL BEING EXTENSIONS OF THE HEADBOX WALLS, ONE OF SAID SLICE WALLS BEING PIVOTED AT ITS UPSTREAM EDGE WITH SAID SLICE WALLS TAPERED TOWARD EACH OTHER AND TERMINATING IN A SLICE OPENING;

FLOW DIVIDER PLATES IN THE HEADBOX EXTENDING COMPLETELY ACROSS THE HEADBOX IN THE DIRECTION OF FLOW AND DIVIDING THE HEADBOX INTO SEPARATE STOCK CHAMBERS;

SEPARATE STOOCKOCK SUPPLY MEANS TO EACH OF SAID CHAMBERS FOR DELIVERING STOCKS OF DIFFERENT PHYSICAL CHARACTERISTICS;

FLEXIBLE SHEET MEMBERS IN THE SLICE CHAMBER SECURED AT THEIR UPSTREAM ENDS IN ALIGNMENT WITH THE PLATES WITH THEIR DOWNSTREAM ENDS BEING UNATTACHED AND EXTENDING TO THE SLICE OPENING WHEREBY THE STOCKS OF THE SEPARATE CHAMBERS DO NOT INTERMIX AND REMAIN SEPARATE FOR THE FULL TRAVEL ONTO THE FORMING SURFACE AND THE PRESSURE OF THE STOCK FLOWS ON OPPOSITE SIDES OF SAID SHET MEMBERS REMAINS EQUAL FOR UNIFORM VELOCITY FLOW AT THE SLICE OPENING, AND A FORMING SURFACE POSITIONED TO HAVE STOCK DISCHARGED THEREON FROM THE SLICE OPENING.

2. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 1:

wherein the forming surface is formed of a pair of looped traveling forming wires with guides therein arranged to form a forming throat into which the stock is discharged followed by a forming run.

3. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 1:

including a plurality of flexible self-positionable trailing members in each chamber of the slice chamber and terminating upstream from the flexible sheet members in the slice chamber.

4. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier, the combination comprising:

a foraminous forming surface for receiving a liquid stock and dewatering the stock;

a headbox having a slice chamber formed by slice walls terminating in slice lips which form a slice opening for directing a jet stream onto the forming surface;

said slice lips extending substantially the same distance toward said surface;

said headbox also having a preslice chamber immediately upstream of the slice chamber;

a first rigid partition extending across said preslice chamber dividing the preslice chamber into multiple stock chambers;

a second partition extending across said slice chamber forming a continuation of said first partition and dividing the slice chamber into multiple stock chambers to extend to the slice opening;

said second partition being supported only at its upstream end with its downstream portion unattached and constructed to be self-positionable so as to be responsive to forces exerted thereon by the stock flowing toward the slice so that the stocks from the multiple chambers exit through the slice opening at uniform velocity; and

means for supplying stocks of different characteristics to each of said multiple stock chambers in the preslice chamber.

5. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 4:

wherein said forming surface is comprised of a first looped traveling forming wire and a second looped traveling forming wire; and

guide means within said wires guiding the wires to provide a forming throat receiving stock from said slice followed by a forming run between the wires.

6. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 4:

including a third partition extending across said preslice chamber so that the headbox is divided into at least three stock chambers comprising two outer chambers and one intermediate chamber and including a fourth partition being a continuance of the third partition which extends to the slice opening and is self-positioning.

7. In a machine for making a multi-ply Web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 6:

including means for delivering stock having long fibers to each of the outer chambers of the headbox; and

means for delivering stock having a high ash content to the intermediate chamber of the headbox.

8. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 4:

wherein the slice chamber is tapered and each of the multiple stock chambers of the slice chamber contains a plurality of flexible self-positionable trailing elements anchored at their upstream ends with their downstream ends being self-positionable by the pressures of the stock flowing through the slice chamber.

9. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 8:

wherein each of said trailing elements is tapered and is thicker at its upstream end than the downstream end.

10. In a machine for making a multi-ply web such as a paper from stocks having a slurry of fibers in a liquid carrier constructed in accordance with claim 8:

wherein each of said flexible elements is in the form of a continuous sheet extending fully across the width of the slice chamber.