"单面针织物" can be translated into English as "single-face knitted fabric" or "single jersey fabric".
"Single-face knitted fabric" directly describes the characteristic of having only one visible or finished side.
"Single jersey fabric" is a more specific and commonly used term in the textile industry, referring to a type of knitted fabric with a smooth face on one side and a purl (looped) back on the other, though often perceived as having a single consistent appearance when viewed from the face side.
Both translations are acceptable, but "single jersey fabric" might be more recognized in professional contexts.