Why Bottle Shoulder Clearance Matters in Fitted Inserts

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      The shoulder is often where a bottle begins to narrow toward the neck. If the insert touches that area unintentionally, it can hold the bottle above its intended seat or rub on a decorated surface. A tray that looks like a good fit from above can still load the shoulder when the carton closes or when the pack is squeezed in transit.

      Distinguish support from clearance

      Identify where the insert is designed to carry the bottle and which surfaces should remain clear. Seat the bottle without forcing it. Check the shoulder around the part and observe whether the bottle can reach the intended bottom or side stops. Compare open and closed carton conditions, since the lid or a folded flap may change the load path.

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      Test the actual packed combination

      Compare production representative bottles, decorated parts and inserts. Account for both the contour and the position of the shoulder, since a slightly higher shoulder can make contact even when the maximum bottle width is unchanged. Inspect for marks after the agreed handling trial. If contact is intended, check its location and effect rather than assuming that all shoulder contact is a defect.

      Packaging sample showroom of SamBound New Material Technology Company Ltd. Company information: sambound.com.

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