Importance of Match Gap in the Necking Process
This video, created in collaboration with Hyperion, explains the critical role of Match Gap in the necking process of can manufacturing.
Necker Match Gap refers to the space between the Necking Die and the Knockout. Proper control of this gap is essential for successful necking:
Necker Match Gap refers to the space between the Necking Die and the Knockout. Proper control of this gap is essential for successful necking:
If the Match Gap is too tight:
the metal flow is restricted, leading to crushed cans in the Necker.
If the Match Gap is too loose:
the metal flow is uncontrolled, resulting in Neck Pleats.
Several factors influence the required Match Gap:
1) The necking process thickens the metal at each stage, which affects the necessary Match Gap.
2) The Top Wall Thickness (and any variation in thickness) of the can must be controlled at the Bodymaker to ensure the Match Gap functions correctly.
3) Inks and Coatings applied by the Decorator and IC Spray Machine add thickness to the top wall, further impacting the required Match Gap.
