Marker:
A marker is a diagram of a precise arrangement of pattern
pieces for sizes of a specific style that are to be cut from in one spread. Marker
is a thin paper which contains the patterns of all the components needed to
produce a garment ensuring the least fabric wastage.
Marker Efficiency:
Marker efficiency is defined as a ratio of area of marker
used in a garment and area of total marker.
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Secondly, Glock and Kunz have
defined this term in their book, Apparel Manufacturing as Marker efficiency is
determined from fabric utilization, the percentage of total fabric that is
actually used in garment parts.
Marker efficiency and Fabric utilization is not
same thing. In marker efficiency calculation fabric wastage due to end bits and
end loss is not included but in fabric utilization calculation all kinds of
fabric wastage are included.
Calculation of Marker Efficiency:
Calculation method of marker efficiency has been explained
below with formula.
Formula#1
Marker efficiency% = (Area of marker used for garments /
Area of total marker) * 100
Area of marker used for garments: In case of CAD marker, CAD system automatically calculates
total area of garment pattern pieces placed in a marker. So you get area of
marker that is consumed by garments from CAD system.
Total Marker Area: To
calculate total marker area simply multiply marker length by marker width. In
manual marker it is difficult to measure surface area of garments patterns in a
marker. You can use a mechanical device, Planimeter, to calculate the surface
area of pattern pieces from outlines of the pattern pieces. Another method can
be practiced to calculate marker efficiency when you don’t have CAD system or
Panimeter. Calculate ratio of weight of fabric consumed by pattern pieces and
total weight fabric under total marker area. So a separate formula is used to
find marker efficiency.
Objectives of Marker Efficiency:
-Examine how fabric utilization affects marker efficiency
-Enumerate the factors affecting material utilization
Factors of Marker Efficiency:
- Fabric
Characteristics
- Characteristics of
Pattern Pieces
- Grain Line
Orientation
- Standards of
Fabric Utilization
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