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Explanation: in other words: fitting/sealing with an aluminium cap. From what I can tell, aluminium caps are used to seal vials, bottles and other pharmaceutical containers.
The services offered in your text seem to be: sterilising, rubber stoppering and aluminium capping. Here are some google find which may be of use:
The final vaccine containing whole live attenuated virus is presented in rubber
stoppered aluminium capped vials, sterile and free from added preservatives. ... www.anhydro.co.uk/html/xerovac/xero.htm
refurbished machinery. Aluminium Capping Services now offer an alternative choice... the fully comprehensive ACS range of processes. www.bedestone.co.uk/capping.html
facility, viz., vial stoppering and ampoule usage till the vial washing, vial sterilization, rubber bunk selection and sterilization, aluminium cap selection ...
Hope it helps, oh and a Happy New Year!
Nicole Tata Local time: 01:07 Native speaker of: English, German