How to read the slash in “1/4 satin”? I am not a native English speaker, and I would like to know how do you read “1/4 satin”?

Is it pronounced as one-by-four satin or as one-to-four satin when read out?

Please note that this use is related to the binding structure of textiles.

For instance, in the following texts: It is observed that when the weave is changed from 4 / 1 satin to 1 / 4 satin ， the average warp tensions at shedding and beaten-up increase. 

thanks.
It would be referred to as "1 in 4" satin and refers to the weave pattern.  4/1 satins would be warp faced twills and 1/4 satins would be weft faced twills.



For more information on this you can read all about it at  https://www.textileschool.com/articles/125/twill-weaves