German to English Tech/Engineering

The terms "Kettenabstand" and "Beutelabstand" appear in a short text that describes some of the characteristics and selling points of a company's multi-layer shrink bags, used for vacuum-packaging foodstuffs. After mentioning that only one variety of their ML bags is available as a "Kettenbeutel," which I roughly translated as "perforated bags on a roll," the following information is given:
"Kettenabstand: gemessen von der Außenseite der Klebebänder: 70 mm bis einschl. 200 mm, mit + Abweichung von 5 mm.
Beutelabstand: 20, 40, oder 60 mm."