1 edition of Pulp flow and headbox design found in the catalog.
Pulp flow and headbox design
Supplement to work of the same title by Lillian Roth ... [et al.] (1959).
|Statement||Jerry Byrne and Jack Weiner.|
|Series||Institute of Paper Chemistry bibliographic series -- no. 188|
|Contributions||Weiner, Jack., Roth, Lillian., Institute of Paper Chemistry.|
|The Physical Object|
|Number of Pages||80|
Measuring Paper Machine Performance Dick Reese Dick Reese and Associates, Inc. Edgerton Dr Norcross, GA () [email protected] Pulp and Paper Control Valves Introduction This sourcebook’s intent is to introduce a pulp and paper mill’s processes, as well as the use of control valves in many of the processes found in the mill. It is intended to help you: Understand pulp and paper processes Learn where control valves are typically located within each processMissing: headbox.
The paper machine headbox is an equipment that supply very low consistency stock into the forming section uniformly. The formation and uniformity of the final paper product depends on the dispersion of the fiber and fillers. The furnish delivery system varies on the construction of . into a pulp flow within the headbox. D21F 1/06 Regulating pulp flow Definition statement This subclass/group covers: Regulating the pulp flow into and out of the headbox. D21F 1/08 Regulating consistency Definition statement This subclass/group covers: Dilution devices before or in the headbox. D21F 1/10 Wire-cloths (production of wire-cloths B21F).
PROCESS FLOW: STOCK PREPARATION – PM-5&7 Pulp from Pulp Mill Dry broke through pulper Tinting dyes/ pigment New Mixing Chest Broke Chest-1 Optical whitener Refining of Stock through Refiners Broke Chest-2PAC: Poly Aluminum Chloride Mixing Chest Dispersed Rosin Filler Slurry Machine Chest Cationic tarch SR Box Wet Broke from respective M/C Missing: headbox. PrimeFlow headbox for paper and board machines ANDRITZ PrimeFlow headboxes include PrimeFlow SW for Fourdrinier and hybrid formers, and PrimeFlow TW for gap formers. They feature efficient turbulence generation for optimal formation over a wide range of headbox flow rates and consistencies.
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The new headbox design is able to produce a high quality jet almost regardless of the head loss, i.e. machine speed or flow rate. The new turbulence tube geometry combines. All the headbox are not suitable for all grade of paper and machine speed. A well constructed Headbox can provide high quality board and paper and higher productivity.
So the design should be properly. Now a days Hydraulic type headboxes are commonly used in the pulp and paper industry. The headbox is also known as flowbox. Paper machine headbox types. This headbox design is inappropriate for modern, wide, high-speed paper machines because its large chamber is not compatible with high stock pressures, and the long perforated rolls are easily deformed.
Hydraulic headboxes, commonly installed on modern paper machines, have no perforated rolls and usually no air pads. Instead, the flow from the distributor proceeds through deflocculating elements.
provide velocity control of the jet leaving the headbox by the pressure in the headbox; and break up of pulp flocs by turbulence within the headbox. These functions are achieved by causing the stock to flow through several rotating perforated rolls within the headbox or, in modern headboxes, past stationary flow elements.
After passingFile Size: KB. To have desired operation from headbox, its precise control is necessary. The precise modelling of headbox, leads to design of efficient controllers for its proper control to get the desired response. The headbox physically prepares the pulp stock before it is converted into paper by the papermaking machine.
It does so by smoothing out any outstanding variability in the pulp flow. The front section of the headbox, called the stock distributor, receives the pulp stock flow from one or more inlet pipes and. Method and apparatus in the headbox of a paper machine and in its approach pipe system.
In the headbox, pulp suspension is fed through the approach pipe system and a pressure screen arrangement, if any, to a distributing header part, from which the pulp suspension flow is conducted through a turbulence generator section and further to a lip by: 7.
The Handbook For Pulp and Paper Technologists (The SMOOK Book), is by far the best-selling text to introduce the entire technology of pulp and paper manufacture. Now available in Spanish, the book features 27 chapters covering all aspects of pulping and papermaking, as well as hundreds of illustrations, charts, and tables to help the reader Missing: headbox.
The headbox, from which pulp suspension is jetted out, as shown in Fig. 1, is the most important part for papermaking. It controls the flocculation of pulp fibers and jets out pulp liquid in a state of uniform concentration of pulp fibers, as much as Size: KB. A hydraulic headbox is the design commonly installed on modern paper machines.
This type of headbox has no air pad or perforated rolls. Instead, the flow from the manifold and tube bank discharges into a stilling chamber, which is substantially smaller than the plenum of the air-pad headbox and thus avoids the structural problems that limited theFile Size: KB.
Based on the design of the headbox, flow stabilization elements are present inside the headbox. These elements prevent the fibers from flocculating and settling by producing turbulence. Depending on the type of headbox these elements may be rolls, tubes or plates with even holes. Flow stabilization in headbox improves paper Size: 1MB.
Headbox Consistency The Slice opening together with the head box pressure determines the volume of the head box jet flow and thus the consistency of the outflowing stock. The Slice opening also affects also the qualitative properties of paper. Chapter 2 The Pulp and Paper Making Processes The modem manufacture of paper evolved from an ancient art first developed in China, ca.
A.D. Although the modem product differs considerably. Headbox designs are closely associated with the theory of fluid mechanics.
Computational fluid dynamics (CFD) has been used to model the turbulent flow of pulp fiber suspensions in pipes and headboxes. Bakker and Fasano were the first to model the pulp flow in a stock chest with a side entering impeller using by: 2. The headbox consist of a number of components support beam, tube bank, roof, slice opening arrangement and apron beam.
To understand the purpose of the headbox a section of the process flow around the headbox in the paper machine is used, see figure 2. The process starts when the water fiber suspension is pumped into the tapered headers. Headbox Here the stock is sprayed into the machine and distributed evenly along the entire width of the machine in the gap between two rolls.
On one roll there is a wire (screen cloth) and on the other a felt. Headbox. The FlexJet TM family of headboxes is designed to deliver optimum performance for almost any grade of paper or board.
FlexJet TM headbox products include several different models of both hydraulic and roll headbox technology, with both radial distributor and tapered header inlet options, and a new wet end applicator for Microfibrillated Cellulose (MFC) and other additives.
The ANDRITZ PrimeFlow headbox for tissue machines features a unique eccentric shaft for slice adjustment that ensures minimized slice deflection. It is designed for jet speeds up to 2, m/min and enables best cross profiles.
In this study we investigate the potential interplay between dilution flows injected into the headbox flow, and design parameters like the headbox contraction ratio and the strong local acceleration caused by a slice bar, with the objective to see if sheet disturbances and variability may result.
AUTOMATION AND CONTROL OF PULP AND PAPER PROCESSES H. Koivo Helsinki University of Technology, Espoo, Finland Keywords: Paper machine, mechanical pulp, chemical pulp, digester, recovery boiler, grinder, stone groundwood, thermomechanical pulping, headbox control, cross-direction.
Water removal in the press section of paper board, and pulp machines has an important influence on machine efficiency and cost. A press section design equation, based on the decreasing Missing: headbox.The headbox and machine fabrics are protected from larger contaminants that might enter the approach flow system by a pressure screen for each ply on the machine, and also the headbox trim dilution pump.
For machines fed solely by market pulp, these pressure screens operate with mm diameter holes to prevent debris from reaching the machine.The purpose of this book is to describe how pressure can be determined anywhere within a pump system.
The inlet and outlet of a pump are two locations where pressure is of special interest. The difference in pressure head (the term pressure head refers to the energy associated with pressure) between these two points is known as the Total Head.