What is the purpose of keeping a gap between Ca rod and steel sheath in the cored wire?

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Amir Shirkhani

https://patents.google.com/patent/US5988545A/en

Dr. Pallavi Deshmukh

Dear Sir,

Thanks for the reply and the patent. This patent is on the spacing while winding the cored wire and what I am interested is the inside spacing between the calcium rod and the steel strip of the cored wire. We have found the better recovery of Ca in steel if a little space is maintained between rod and steel strip than the compacted cored wire.