Index
- General - Technology of Short-staple Spinning
- Raw Material as a Factor Influencing Spinning
- Opening
- The need for opening
- Type and degree of opening
- The intensity of opening
- General considerations regarding opening and cleaning
- Carding
- The purpose of carding
- Clothing arrangements
- Forces acting on the fibers
- Fiber transfer factor
- The most important working regions in carding
- Straightening-out of fiber hooks
- Cleaning
- Blending
- Reducing the Unevenness of Yarn Mass
- Unevenness of yarn mass
- Basic possibilities for equalizing
- Doubling
- Leveling
- Drafting with simultaneous twisting
- Attenuation (draft)
- The draft of the drafting arrangement
- The drafting operation in the drafting arrangement
- Behavior of fibers in the drafting zone
- Friction fields
- Distribution of draft
- Other drafting possibilities
- Additional effects of draft
- Yarn Formation
- Assembly of fibers to make up a yarn
- Arrangement of the fibers
- Number of fibers in the yarn cross-section
- Fiber disposition
- The order of fibers within the yarn
- The positions of the fibers in the yarn structure
- Yarn structure
- Fiber migration
- Imparting strength
- Possibilities for imparting strength
- True twist (with reference to ring-spun yarn)
- False twist
- Self-twist
- Assembly of fibers to make up a yarn
- Handling Material
- Carriers for material
- Material carriers and transport
- Package forms
- Classification
- The most widely used package forms with internal formers
- Laying down in cans
- Winding by rolling and lap forming
- Winding on flyer bobbins
- Winding of cops
- Build of cops
- The winding process
- Force and tension relationships during winding by using travelers
- Effects on the traveler
- Carriers for material
- Quality Assurance
- References
- The Blowroom
- Introduction
- Summary of the process
- The components of blowroom machines
- Feeding apparatus
- Opening devices
- Classification
- Endless path devices (spiked lattices)
- Gripping elements (plucking springs)
- Rotating devices
- The grid
- Interaction of feed assembly, opening element and grid
- Alternative cleaning possibilities
- General factors influencing opening and cleaning
- High-performance machines ought to be easy to handle
- Transport of material
- Control of material flow
- Damage prevention and fire protection
- Waste management
- Economy of raw material utilization
- Quantity of waste material
- Classification of spinning mill waste
- Recycling of waste
- Handling dust and fly
- Final disposal of waste
- The Card
- Summary
- The operating zones of the card
- Material feed
- Feed device to the licker-in
- The licker-in zone
- Auxiliary carding devices (carding aids)
- Main cylinder
- Flats
- Doffing
- Detaching
- The machine drive
- Card clothing
- Autoleveling equipment
- Basics
- Classification
- The principle of short-term autoleveling
- The principle of medium-term autoleveling
- The principle of long-term leveling
- Measuring devices
- Maintenance
- Stripping the clothing
- Burnishing the clothing
- Grinding the clothing
- High-performance maintenance systems
- Settings
- Auxiliary equipment
- Technical data of three high performance cards
- References
- The Blowroom
- Spinning Preparation
- The Combing Section
- Introduction
- Technology of combing
- The noil extraction theory
- Derivation according to Gégauff
- The quality of the combing operation in forward and backward feeding
- The influence of machine components and settings on combing
- Preparation of the stock for combing
- The comber
- Outline
- The feed
- The nipper assembly
- The comb
- Take-off of material
- The drafting arrangement
- Coiling the sliver
- Waste removal
- Machine data
- The Saco Lowell double-sided comber
- Automation in the combing section
- Number of drawframe passages
- Upgrading of raw material
- New market segments due to upgrading of cotton
- Some preconditions
- The Drawframe
- Introduction
- The task of the drawframe
- Operating principle
- Operating devices
- Creel (sliver feed)
- The drafting arrangement (general considerations)
- Requirements
- Influences on the draft
- Elements of drafting arrangements in short staple spinning generally
- Types of drafting arrangement used on drawframes
- Suction systems for the drafting arrangement
- Coiling
- Monitoring and autoleveling
- Aim of autoleveling
- Classification
- Monitoring devices with self-compensation
- Monitoring devices with autoleveling systems
- Leveling drawframes with open-loop control
- Leveling drawframes with closed-loop control
- Correction length
- The Rieter RSB leveling system
- The integrated monitoring system (process control techniques)
- Blending drawframes
- Logistics
- Technical data of a high-performance drawframe
- The Roving Frame
- Introduction
- Description of functions
- The operating zones of the roving frame
- Machine drive system
- Special design (Saco Lowell „Rovematic“ frame)
- Accessories
- Automation
- Technical data (normal values)
- Appendix
- The Combing Section
- The Ring Spinning Machine
- Function and Mode of Operation
- Structural Configuration of the Machine
- Basic frame and superstructure
- The bobbin creel
- The drafting system
- Influence on quality and economy
- Conceptual structure of the drafting system
- The top rollers
- Pressure roller loading
- Fiber guidance devices
- The spindle
- The thread guide devices
- The ring
- The ring traveler
- The Machine Drive
- Cop Buildup
- Automation
- The need for automation
- The potential for automation
- Doffing
- Automated cop transport
- Piecing devices
- Roving stop motions
- Monitoring
- Auxiliary Equipment
- Fiber extraction
- Blowers (traveling cleaners)
- Compact Spinning
- Technological Addenda
- Spinning geometry
- Quality standards
- A new approach to quality
- Quality standards according to Uster Statistics
- The Importance of Rotor Spinning
- Historical background
- Development and current status of rotor spinning
- The potential of rotor spinning
- The principle of rotor spinning
- Performance parameters of rotor spinning machines
- Machinery and Process
- Structure of the rotor spinning machine
- Operating principle of the rotor spinning machine
- The spinning box
- Package formation
- Drives
- Suction systems
- Operating and monitoring
- Quality control systems
- Production monitoring
- Machine and Transport Automation
- General
- Machine automation in rotor spinning
- General
- Application options for operating robots
- Automatic piecing
- Semi-automatic piecing system on manually operated machines
- Automatic package change
- Batch change
- Supplying empty tubes
- Automatic sliver piecing after can change
- Transport automation in the rotor spinning mill
- Applications Engineering
- Raw material selection
- Fiber properties
- Preparation of raw material
- General
- Disturbing materials in the cotton
- Processing problems with man-made fibers
- The processing stages
- Ranges of application of the spinning elements
- General
- Range of application of the opening roller
- Range of application of the rotor
- Range of application of draw-off nozzles and draw-off tubes
- Components for manufacturing fancy yarns
- Selection and influence of draft and yarn twist
- Yarn and machine data for the main rotor-spun yarns
- Ambient conditions in the spinning mill
- Downstream processing and end products
- Technology
- Yarn formation
- Genuine and false twist
- Wrapper fibers
- Yarn structure and physical textile characteristics
- Economics of Rotor Spinning
- References
- The Importance of Rotor Spinning
- Alternative Spinning Processes
- The Various Spinning Methods
- Open-end spinning processes
- The basic principle of yarn formation
- Electrostatic spinning
- Air-vortex spinning
- Friction spinning
- The University of Manchester Discspinner
- Twist spinning
- Friction (self-twist) method
- Wrap spinning
- Operating principle
- ParafiL system by Suessen
- Technological and economic interrelationships
- The False-twist process
- The false-twist principle
- Two nozzle air-jet spinning
- Dref-3000 process
- PLYfiL spinning process
- Air-jet spinning
- Open-end spinning processes
- Summary and Outlook
- Processing principles
- Field of use
- Yarn characteristics
- Economic comparison
- Outlook
Automatic doffing enables labor requirements and doffing times to be drastically reduced. The fully automated Rieter F 35 roving frame performs doffing in less than 2 minutes. This has been made possible by separate actuation of bobbin rail and doffer rail by two independent frequency converters.
The doffing sequence of the 
F 35 roving frame is illustrated in Fig. 33.
Fig. 33 – Doffing sequence; 1. – The bobbin rail (1) moves out and at the same time the footboard is set up. – The doffer beam with the empty tubes is lowered between the full bobbins (2).; 2. – The empty bobbin pegs of the doffer beam grasp the full bobbins. (All the bobbin pegs are now occupied). – The doffer beam moves up to reversing position.; 3. – The conveyor belt in the doffer beam moves into intermediate position.; 4. – The doffer beam puts the empty tubes onto the spindles.; 5. – The doffer beam moves into top position with the full bobbins. – The slide moves in and the footboard is lowered at the same time. – The safety zone is free again.; 6. – The bobbin rail (1) is raised to spinning start-up position. – The full bobbins (2) are transported to the transfer station. – The roving frame starts up automatically.
