Assertion: fountain pen's cap | /r/CapableOf | seal around the nib
Facets:
value: tightly
type: MANNER
Source sentences:
text: For pens with non-retractable nibs, the adoption of screw-on caps with inner caps that sealed around the nib by bearing against the front of the section effectively solved the leakage problem (such pens were also marketed as "safety pens", as with the Parker Jack Knife Safety and the Swan Safety Screw-Cap).
text: so pen makers began to produce what were known at the time as safety pens which either consisted of a retracting nib or a screw-on cap that sealed tightly around the nib, preventing it from leaking.
text: Other had screw-on caps with inner caps that sealed around the nib.