To print keyline labels directly from the iPad, an AirPrint-capable printer is required. Depending on the desired format, a printer such as the Brother QL-1110NWB is suitable.

If label printers are already available in the company, they would have to be made AirPrint-capable via a bridge or external Mac. Which bridge can be used depends on the printer to be controlled and cannot be answered in general.
In this case, it is best to ask your IT partner or switch to new AirPrint-capable printers right away.

The Netgear Genie App, a label printer with a Mac AirPrint capability, has already been successfully made several times.
You can find the app under this link.
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We cannot provide support for printers and their configuration. 

If in any doubt, ask your IT service provider.