Binding Defects
Binding defects affect the structural integrity and longevity of a book. With our specialized experience in both softcover and casebound binding operations, we can explain the causes behind these common binding issues and their impact on book quality and durability.
Backfold
A signature is folded/inserted the wrong way, scrambling page order or orientation.
Blocking
Finished books stick together in stacks due to tacky coatings/lamination, adhesive, or set-off.
Book warp
Finished book bows or twists, often from moisture, adhesive, or board/paper imbalance.
Case shift
Book block is positioned incorrectly inside the case, creating uneven margins ("squares").
Case skew
Case is applied at an angle relative to the book block; looks crooked when closed.
Corner damage
Cover corners are bent, dented, or chipped from handling, packing, or transport.
Cover delamination
Lamination/coating separates from cover stock (peeling, lifting, or flaking).
Cover scratching
Surface marks on the cover from conveying, stacking, or packing friction.
Cover warp
Cover bends or curls due to moisture imbalance, grain direction, or lamination/coating stress.
Crossed signatures
One signature partially inserts into another, causing jams, creases, and page damage.
Die-cut defect
Die-cut edges are rough or the cut is misplaced, affecting windows/shapes.
Duplicate signature
A whole section is repeated, creating a duplicated block of pages.
Dust jacket misfit
Dust jacket is sized/folded poorly; flaps don't align or the jacket fits awkwardly.
Dust jacket scratching
Surface damage on dust jacket from handling, packing, or shipping.
Embossing damage
Embossing/debossing crushes or cracks the material due to excessive pressure or mismatch.
Endsheet lift
Endsheet separates from the board or block due to poor adhesion or contamination.
Extra pages
Extra pages appear because two sheets fed as one or a section was doubled.
Foil stamping defect
Foil stamping is misaligned or incomplete (voids/missing foil), hurting appearance.
Fold misregister
Folded sections don't align with print or aren't square, causing margin/trim issues.
Fold wrinkling
Wrinkles/creases form at folds from timing, paper behavior, or poor folding setup.
Gatefold misfold
Gatefold doesn't align or close properly and may stick out past trim.
Glue squeeze-out
Excess glue extrudes onto pages/cover, causing mess and sometimes stuck pages.
Glue starvation
Too little adhesive is applied, resulting in weak bonding and loose pages.
Glue stringing
Stringy adhesive creates contamination or visible webs on pages/cover/spine.
Head/tail damage
Damage at the top/bottom edges from trimming clamps, dull knives, or transport.
Headband defect
Headband is crooked, off-center, or not properly attached (typically hardcovers).
Hinge cracking
Cracks at the hinge/joint when opening, often tied to scoring, grain, or brittleness.
Knife marks
Linear marks from damaged/dull knives or debris in trimming equipment.
Lamination wrinkling
Wrinkles/bubbles in lamination from tension, heat, pressure, or adhesive problems.
Lining delamination
Spine reinforcement separates, reducing strength and affecting opening.
Loose pages
Pages detach due to inadequate adhesive/stitching or bond failure.
Misplaced insert
Insert is in the wrong spot or oriented incorrectly.
Missing insert
A required insert/tip-in/bind-in is not present.
Missing pages
One or more pages are missing due to a sheet feeding/folding error.
Missing signature
A whole section is missing, creating a missing block of pages.
Off-fold
Paper folds in the wrong location, causing crooked pages or misaligned crossover images at the spine.
Out-of-square book
Book block isn't square, creating uneven edges and fit problems.
Over-trim
Too much is cut off; text/images are too close to the edge or clipped.
Page pull-out
Pages can be pulled free too easily because the bind is under-strength.
Page tears
Physical tears or nicks to pages from trimming, conveying, or handling.
Pastedown bubbling
Bubbles or wrinkles under endsheets from uneven glue, moisture, or trapped air.
Perforation tear-out
Perforations tear raggedly or unintentionally due to weak paper or poor perf setup.
Ragged trim
Trim edges look torn or rough due to dull knives, clamp pressure, or weak paper.
Shipping damage
Damage from packaging/transport (crushed corners, scuffs, warp) rather than the book's content.
Shrinkwrap defect
Shrinkwrap is too loose or overheated, causing distortion, tears, or poor presentation.
Smyth tear-out
Paper tears at sewing holes due to weak folds, tension, or brittle paper.
Spine cracking
Cracks in the spine area when opening due to brittle glue/cover materials or grain issues.
Stuck pages
Individual pages adhere to each other from glue squeeze-out, set-off, coating, or blocking.
Thread break
Sewing thread breaks, leaving weak sections that can loosen or fail.
Trim off-register
Trimming is positioned incorrectly, creating uneven margins or removing content.
Under-trim
Not enough is trimmed; edges look uneven or folded sections extend past the trim.