Color Matching in Cable Manufacture
What is color matching?
Color matching is the process by which the
color of the cable is made to match with
the color of the equipment or appliance. The start of the
color development is done by two ways:
1. The telephone manufacturer gives the appliance shell which
shows the color shade, or,
2. The telephone manufacturer informs a standard color shade,
provided by internationally accepted color shade cards, viz,
RAL or PANTONE shades.
Thereafter the color shade for the cable is developed to meet
The Importance of the Cable Color and how it is measured?
The effect of color on the overall appearance of a cable
/ coil is critical to its acceptability and success in the marketplace.
Lack of color consistency, robustness, or an undesirable shade
can displease consumers and merchandisers
To ensure color matching and color quality control there
are variety of analyses. Test that measure color change
over time, or as a result of environmental exposure include
accelerated weatherometer tests such as xenon arc tests, and
outdoor tests to assess a Thermoplastic’s color stability
and color consistency.
The base color of a material used for cables is
measured by using the Hunterlab L*a*b color measurement scale,
which gives numerical values for changes that an individual
can detect visually.
The “L” value gives the measurement for lightness, with 100
being perfectly white and 0 being completely black. The “a”
gives a measurement of redness [plus (+) values] and greenness
[negative (-) values], with gray being zero. The “b” value
gives a measurement of yellowness [plus (+) values] and blueness
[negative (-) values] with gray being zero
The total color difference dE, is a combination of the difference
between the three values obtained on a control versus the
values obtained on a sample.,
A trained color inspector under optimum conditions can detect
color differences at a dE of 1.5, while untrained individuals
generally begin to notice a difference at dE of 3 or more.
At Datafield, a dE of 1.5 is followed for lighter shades and
a dE of 3 is followed for darker shade matching.
A lower dE translates into lower variation in the amount of
colorant required for a given production run. It also is an
important factor to ensure precise matching of thermoplastic
Degeneration aspects of color
The PVC compound used in cable manufacture
should conform and meet the following requirements:
- COLOR MIGRATION Color migration is the phenomenon by which
the color pigments used to generate and give a particular
color moves out, thus resulting in an entirely different color.
Due to this the attractiveness and splendor the cord generates
to the telephone is lost. When the color migrates it transfers
itself to materials as ABS (Which is what the Telephone
- PLASTICIZER MIGRATION - Plasticizer provides flexibility
to the cable. When poor plasticizers are used, the cable will
become sticky, be oily on surface. This will attract a lot
of dust and in sometime the cable would be hard and rigid.
- LIGHT STABILITY When the cable is kept under normal atmospheric
and light conditions, the colors should not fade.
- ODOUR A good cable should not small bad.
|Compound Manufactured to develop Color