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Packco, Inc. Bag Sealers, Heat Sealers, Shrink Film Packaging :: Shrink Bands: A Glossary of Terms

Shrink Bands: A Glossary of Terms

Shrink Bands: A Glossary of Terms

Cut Length: The Length of a pre-cut shrink band from top to bottom (open ends)

Full Body Seal: A shrink band that covers the entire container from top to bottom. This type of band is used if the container is smooth and the same dimension as the closure (lip, cap, etc.), meaning there is no ring or protuberance below the closure for the shrink band to shrink around or under.

Horizontal Perf: A perforation left to right (TD or Transverse Direction) which allows the portion of the shrink band covering the closure (cap) to be twisted and separate with the removal of the closure.

LayFlat (LF): The dimension of the shrink band from left to right (border to border – closed sides). The LF dimension is equal to ½ of the circumference of the band.

Machine Direction (MD): The direction from open end to open end on a shrink band.

Perforation: A series of small holes formed in a shrink band to make the band easier to remove. See “vertical perforation” and “horizontal perforation”

Pre-Form: A type of shrink seal that is not laid flat. Rather, it is pre-formed to fit a specific type and size of container, such as a round deli-pack. The pre-form has a pre-formed lip that lays over the closure (typically a lid) and a pre-formed “skirt” length down the side of the container making it easy to place on the container.

Random Print: Print that is randomly placed on a cut band or roll stock. While easily readable, each individual line may not be complete. Example: “Sealed For Your Protection.”

Registered Print: A piece of printing that is placed in exactly the same position on each shrink band.

Roll Stock: Shrink material on a roll (typically 500 meters in length) for use on an automatic machine. The machine feeds the roll of material, places it on the container to be sealed, cuts the correct length from the roll and (usually) places the container (with shrink band) in a heat tunnel.

Seamed Band: A shrink band that has a glued seam. Usually seamed bands are used when multiple colors are printed or when extremely close dimensional tolerances are required.

Seamless Shrink Band: A shrink band that is cut from an extruded (seamless) roll of PVC tubing.

Shrink Band: A pre-cut piece of PVC tubing designed to be applied to a container and then shrunk by the application of heat. Once shrunk, the bands provide tamper-resistance and tamper-evidence.

Size: The dimensions of shrink bands or labels are stated in millimeters (25.4 mm = 1 inch). A cut band that is 6 inches in circumference and 1 inch tall and made from 2 mil material would be referred to as: 76 mm LF x 0.05 mm x 25 mm CL, where 76 mm is ½ the circumference of the band (left to right), 0.05 is the decimal equivalent of 2 mil (U.S.) and 25 mm is the cut length (top to bottom).

A pre-from band for a typical 16 oz deli-pack would be a 192 mm x 0.05 mm x 25 mm + 7 mm. 192 mm is ½ the circumference of the band needed to fit the tub, 0.05 denotes the material thickness (2 mil U.S.), 25 mm notes the length of the “skirt” (cut length) and the “+ 7 mm” indicates the length of the “lip” that covers the top of the lid.

Transverse Direction: The direction of a shrink band or shrink label that is from edge to edge (border to border or left to right).

Shrink Factor: The maximum percentage that a shrink band or shrink label with shrink. Usually, the material will shrink 5-10% in the machine direction (MD) and 40-45% in the transverse direction (TD).

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