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eLearning Activities on Headbox

Table of Contents

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Unit 1 The Role of the Headbox

1.1    Headbox Functions
        1.1.1    Dispersion
        1.1.2    Turbulence
        1.1.3    Jet Velocity
        1.1.4    Jet Geometry
        1.1.5    Fiber Orientation
        1.1.6    Basis Weight

1.2    Headbox Characteristics
        1.2.1    Structural Stability
        1.2.2    Stock Movement (inside and outside)
        1.2.3    Stock Consistency
        1.2.4    Interior Circulation (finish, dead spots)
        1.2.5    Energy Consumption ?

Unit 2 Approach Flow

2.1    Headers
        2.1.1    Divergent
        2.1.2    Cross Flow
        2.1.3    Manifold
        2.1.4    Tapered

2.2    Recirculation
        2.2.1    Flow Balancing
        2.2.2    Recirculation Return

2.3    Attenuation
        2.3.1    Attenuators

Unit 3 Internal Flow

3.1    Inside (Mixing) Chamber
3.2    Attenuation (Air-padding)
3.3    Distributor
3.4    Stilling Chamber
3.5    Turbulence Generator
3.6    Nozzle - Converging Zone
3.7    Showers

Unit 4 Headbox Types

4.1    Open Headbox
4.2    Air Padded Headbox
4.3    Hydraulic Headbox
4.4    Headbox for Fourdrinier and Top Former
4.5    Headbox for Twin-wire Former
4.6    Headbox for Tissue

Unit 5 External Flow - Stock Jet

5.1    Slice Geometry
        5.1.1    Lip
        5.1.2    Apron
        5.1.3    Serrated Slice

5.2    Jet characteristics
        5.2.1    Impingement Point
        5.2.2    Angle - Stock Jump
        5.2.3    Velocity - Jet/Wire Ratio

5.3    Wakes
5.4    Fiber Alignment
5.5    Profiling
        5.5.1    Slice Bending
        5.5.2    Dilution
        5.5.3    CD Weight Control

Unit 6 External Flow - Stock Jet

6.1    Formation
6.2    Dry Weight - Profile - CD Weight Control
6.3    Sheet Squareness
6.4    TSO-TSI Profile

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