Bilcare Research, which employs 1000 staff and has annual sales of 300 million euros, produces plastic packaging used in the pharmaceutical, consumer goods and chip card manufacturing industries.
Lindsay Goldberg, which has investments in other packaging groups - Weener, Schur Flexibles und Paccor - declined to comment. Bilcare also declined to comment.
Bilcare's customers include Novartis, GlaxoSmithKline and Pfizer, according to the company's website.