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Wire and Cable Industry

Wire and Cable Industry
The Wire and cable industry use various types of pigments to color polyolefins. Mainly they are employed for Wire Identification Methods. As in cables, it can be seen the coloring done on the outer layer is governed by a different set of requirements as from the inner layers. Pigments that are used in the wire and cable industries can be of two types inorganic and organic. Newer alternatives that are coming in to the market are known as the "mixed-phase metal oxide" pigments. Examples: yellow nickel Titanates and blue and green cobalt Aluminates. A relatively new entrant is the brilliant yellow bismuth vanadate.
Organic pigments are also used but not as popular because they are more difficult to disperse than inorganic ones leading to possible loss in mechanical strength.

Some common examples are given in this table:
Pigment Color Application
Titanium dioxide White Used in Variety of resins
Zinc sulphide White Wide use
Iron oxides Red, yellow, brown, and black Wide use
Lead chromates and lead chromate molybdates Colors can include bright yellow and orange Good use
Cadmium Comes in reds, yellows, oranges and maroons Excellent for engineering resins
Chromium oxides Green Shows good heat and light fastness, variety of uses
Ultramarines Comes in blue, pink and violet shades Works in a wide gamut of resins

Factors in Selection of Pigments

There are various factors that govern the choice of colorants when it comes to the Wire and Cable industries:
Wire Identification Methods
In modern Wire and cable industry, there is a constant need for effective wire identification.
Inkjet Marking- Inkjet technology has vastly improved over the years. With features of less maintenance and faster start-ups, Inkjet marking systems are now more reliable and user friendly. For the wire and cable industry, a dye or pigmented ink, with an Methyl Ethyl Ketone base is applied.
Hot Stamp Marking- Hot stamp marking is still among the most inexpensive techniques for wire identification and is perhaps with exception of laser the only viable option for marking of the Teflon insulated wire. Four important factors here are correct air pressure, dwell time, wheel temperature, and lastly foil. Use of pigments come in the foil part. The foil comprises of a backing and pigment. The pigment gets transferred to wire insulation through the heat emanating from the character wheels. It is vital to note here that certain types of pigments can stick to only particular substrates and would need different temperatures to transfer them. 

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    Mital Mehta


    Kolorjet Chemicals Pvt Ltd.

    Malad West, Mumbai, Maharashtra, India

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