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Cord Making

Materials Used in Manufacturing of Cords

The following items constitute a telephone instrument cord. The final requirements of a cable, determine the items used.

Conductor

core in a cable The typical conductor used for a telephone instrument cord is called tinsel. In some cases annealed bare copper is also used
Tinsel is a special type of Drawn Copper
A 0.079 mm Copper strand is flattened which is called a ribbon. These ribbons are wound round a yarn to form a core.

 Many cores are wound to form a strand.
multicore strand
tinsel The various types of tinsel used are:

1. 4x1 tinsel
2. 4x2 tinsel
3. 7x1 tinsel
4. 7x2 tinsel
etc.

Tinsel types used in telephone cords are Plain Annealed Bare Copper or Cadmium copper

Insulation

The type of insulation used for a coil cord, determines many of the cord properties. It is important to use the correct insulation. The insulated conductor determines properties as elongation, retraction, coiling, cable break-load, etc.

Some of the types of insulation materials are:

1. Polypropylene - PP
2. Polyethylene - PE
3. Poly Vinyl Chloride - PVC
4. Polyester

Sheath on the Cord

The insulated conductors are placed parallel and over sheathed. The material normally used is PVC. For other applications materials like Poly Urethane (PU) etc., are used.The material preferred is based on temperature, area of usage (internal or external, atmospheric conditions), abrasion requirements, retraction, etc.

Telephone cords Telephone cords Cords in various colours

Terminations

In most of the countries modular plugs are used as terminations. The other type of terminations that are in vogue are Y terminals, Country specific plugs, etc. The modular plugs are inserted with nickel plated terminals on which gold plating is done. The gold plating types prevailing in the industry are gold flash, 03u", 6u, 15u, 30u, 50u. In Europe, most countries have their own type of plugs.

In India, for the BSNL phone the 50u plugs are used.

The modular plugs are FCC approved and are available with UL 94 V0 and UL 94 V2 requirements.

Modular Plugs Gold Plated Plugs French Plug
Modular Plugs Gold Plated Plugs French Plug
Korean Plug Korean Plug German Plug
Korean Plug-Bottom View Korean Plug-Top View German Plug

Next - Color Matching in Cable Manufacture.

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