Coiled Cord Conductor- Polyester fibres reinforcement

Since the coiled cord is retractile, long-term compress and stretch is always rather damaged the conductor or open circuit on conductor. Therefore, the high strength polyester fibres are used in conductor reinforcements for produce the coiled cord. Below image showed our conductor which polyester fibres and bare copper conductor are twisted together.

Tinsel

 source from china coil cord

Coiled Cord Retracted Length and Stretched Length

A lot of people always ask how we calculate coiled cord stretched (extended) length from a known retracted length, or how long of straight cable do we need to make a coil cord based on our desired retracted length. I cannot find any related articles on calculating those retracted length and stretched length.
Actually, there is no any fix formula for us to accurately calculate the retracted and stretched length of coil cord, because the coiling is formed by heating wire jacket, during this process, the wire become deformed and effect originally length.
Ideally and assume there is no any distortion to the wire, we can get the retracted length and stretched length as below formula.

source from telephone cord

 

What is CCA Wire?

CCA – Copper Clad Aluminium, due to market demand on low cost wire conductor without major effect to its conductivity, the CCA conductor is adequate to accomplish the applications which do not have particular requirement of higher conductivity or higher transmission performance. We can distinguish the CCA conductor from cut view where the aluminium is clad by bare copper as below picture.

Cut view of Copper clad aluminium

Cut view of Copper clad aluminium

source from Wanglong Cord

What is Bare Copper Wire?

Bare Copper in wire industry means pure copper, the contents of copper greater than 99%, it has very high electrical conductivity. For commercial purpose, there are bare copper clad copper conductors (copper with bare copper plating) in the market, the copper from here means copper alloy which mixed with other compounds and it is impure copper. Cut view is an easy method to distinguish between Solid bare copper and “Bare copper clad copper conductor”, please refer below picture, the yellow color copper alloy between the red color of bare copper, and it is more harden than solid bare copper conductor.

Cut view of Solid bare copper

Cut view of Bare copper clad copper

source from China Coiled Cord

Welcome to Wanglong Cord

Wanglong Cord was founded in Year 2006, currently is one of top 10 telephone cord manufacturer in South Area of China. We produce raw wire by ourselves, it is prior most factors for us to control and ensure our product’s reliability, stability, quality and low priced. Our telephone cords are successfully recognized by many high reputation companies from China, Germany, US, Brazil, Japan, Malaysia, India and we have succeed to get their repeat orders on every period.
Our factory located at Huizhou (China) and also is a sales office for taking care all of China domestic business. For overseas sales, our sales office is located at Penang (Malaysia). On year 2010, Wanglong Cord expanded production capacity with around 4 million Renminbi at Huizhou factory to accomplish higher overseas market demand.
Wanglong Cord create this blog to provide more information which related to our products even some electronic basics knowledge to all users understand easily for design purpose.