foil roll

Foil Shield Anatomy

Posted on Wednesday, December 9, 2015 by Kimberly Versaw

When we say foil shield, what does that really mean?  Terms typically used in conjunction with foil shields are:


  • Longitudinal or pull in is sometimes referred to as a cigarette wrap. This is where the tape is applied longitudinally and folded over its self to form a typical 25% overlap. This can be applied either with the foil side facing inward or outward, relative to the cable core. 

longitudinal fold

  • J-Fold: This type of fold allows for a metal-to-metal contact. Without metal-to-metal contact the signal could escape and cause interference.


  • Z-Fold: Is a combination of a metal-to-metal contact with the addition of an isolation fold. This type of design is typically used in individually shielded pair cables where total shield isolation is required between the pairs. 



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