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Hairpins are sometimes called R’s or R-ing. A cross section cut away of the seam will reveal a Body Hook that takes the shape of an “R”. Magnification under a scope or projector of the cross section cut will show a definite resemblance to an “R”.

Hairpins
Probable CauseSuggested Remedy
Long Body Hooks and Short Cover HooksReduce Lower Chuck or Lifter spring pressure to control Body Hook length.
Tight 2nd Operation seamsLoosen 2nd Operation Seaming Roll settings which forces Body Hook Material over the cover Hook Cut Edge.
Sealing compound variationsDiscuss with Cover Manufacturer
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