unfastener
1. [ noun ] a person who unfastens or unwraps or opens
Synonyms: undoer untier opener
Examples:

"children are talented undoers of their shoelaces"

Related terms: person open loosen unwrap
Similar spelling:   unfasten
  unfastened
  unfastening
  unbiased
  unpasteurized
  unpasteurised
  unfaceted
  unbiassed