Sea Floor Spreading EQ: What is the process of sea-floor spreading?
Spreading Parameters
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Transcript of Spreading Parameters
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Spreading Parameters
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Spreading :
Spreading is the processes of superimposing lengths of fabric on a spreading
table/ cutting table or specially designed surface in preparation for the cutting
process
A spread or lay-up is the total amount of fabric prepared for a single marker
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Requirements of Spreading process
•Shade sorting of cloth pieces (batching/dye lot no)
•Correct ply direction and adequate lay stability
•Alignment of plies (at one edge)
•Correct ply tension(Relaxation/mc with positive feed)
•Elimination of fabric faults (make –through, cut out at lay, sort & re cut,
display of faults position on screen wrt. marker)
• Tight Selvedges
•Elimination of static electricity
•Avoidance of distortion in the spread (glazed paper, flotation table)
•Avoidance of fusion of plies during cutting( anti fusion paper)
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Nature of Fabric Packages
1. Open Fabric – Rolled2. Tubular Knitted Fabric – Rolled and Plaited3. Folded Fabric – Rolled and Plaited4. Velvet-Hanging
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Spreading Equipments
Spreading Surfaces• Separate cutting and Spreading Tables• Air floatation• Pin Tables• Vacuum tables
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Spreading Equipments
Fabric control devices• Tensioning• Positoning devices• Width Indicator• End Treatment devices• Folded Tubular Fabric
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Spreading Time and Cost
Cost of spreading can be focused on four areas
• Spreading Time• Labor cost• Fabric waste and• Equipments purchases
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Methods of spreading
•Spreading by hand
•Spreading using a travelling machine (100 to 150 yards per minute)
( Dead Heading
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Spreading mode :
•Spreading mode is the manner in which fabric plies are laid out for cutting
•Direction of the fabric: it may be positioned in two ways face-to-face (F/F) or with all
plies facing-one-way (F/O/W)
•Direction of the Fabric Nap: it may be positioned nap-one-way (N/O/W) or nap- up-
down
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Spreading mode
F/O/W N/O/W
F/F N/O/W
F/F/ N/U/D
F/O/W N/U/D
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Setup for spreading :
•Verifying cutting orders
•Positioning materials
•Preparing cutting tables
•Preparing machines
•Loading machine
• Reloading and delay time may use up to 70% of the time required for the
entire spreading operation
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Spreading
• Definition
• Height of spread in manual and computerized cutting m/c
• No of plies – low , medium, high ply cutters
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Spreading modes
• Direction of fabric face
• Direction of fabric nap
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Direction of fabric face
• Face to face (F/F)
• Face one way (F/O/W) Two types - Face up Face down
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Face to face
• Continuous spreading
• Fastest
• Least costly
• Used for symmetric, non – directional fabrics
• Lowest quality
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F/O/W• Time consuming
• Expensive
• Fabric is cut at each end
• Turn table usage can avoid dead heading
• Operator can monitor face for flaws
• Helpful in spreading prints, directional. • Pile fabric, corduroy, velvet are spread face down.
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Direction of fabric nap
• Nap one way (N/O/W)
• Nap up and down (N/U/D)
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N/O/W• Asymmetric
• Directional fabric
• Most time consuming
• Gives best quality
• May be F/F or F/O/W • F/F is pair spreading
• Fabric cut and roll turned for each ply in F/F
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Nap up and down
• Continuous spreading
• Fastest
• Least costly
• Used for symmetric, non – directional fabrics
• Lowest quality
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Example
• Directional, symmetrical• Marker mode : nap one way• Spread mode : f/f or face one way ; nap one
way
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Example 2
• Directional, Asymmetrical• Marker mode : nap one way• Spread mode : face one way ; nap one way
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Example 3
• Non - Directional, Symmetrical• Marker mode : nap either way• Spread mode : face to face ; nap either way
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Example 4
• Directional, Asymmetrical• Marker mode : nap one way• Spread mode : face one way ; nap one way