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Fin Seal vs Lap Seal Pouch: How to Choose the Right Back Seal Before You Request a Quote (Video)

This 60-second video sums up the buying guide. The full article covers the details and sources.

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Video transcript

  1. 0:00Behind the seam-free front: one back seam. Fin or lap?
  2. 0:05One film wraps a forming tube; only the back seam differs. A fin joins inside to inside and folds flat; a lap overlaps inside onto outside.
  3. 0:16Your film decides. A fin needs one sealable inside layer, so clear, metallized or foil laminates work. A lap needs both faces sealable, or a coating.
  4. 0:27Pressure peels a fin but shears a lap. The weak spot is where the back seam crosses an end seal: a folded fin makes a taller step. Test filled pouches.
  5. 0:38A lap uses a narrower web but needs an ink-free overlap; a folded fin hides a strip of back artwork. List seal type, fold side, sealable surfaces and test method.
  6. 0:50Then every supplier quotes the same pouch.
  7. 0:55Send product details, size, filling method and quantity per design.

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