Polyethylene Sealing VFFS machines are a specialised category of vertical wrappers engineered specifically to run and seal polyethylene (PE) films. Standard PE is a mono-material that is famously difficult to work with, as it melts and deforms easily under heat, readily sticking to standard sealing jaws.
These machines overcome this challenge by using a non-standard sealing system. Instead of constant-heat bars, they typically use impulse sealing (where a wire rapidly heats and cools) or specially coated “Teflon” jaws with hot air or radiant sealing. This allows them to create a strong, clean seal on the PE film without melting or sticking.
This technology is the essential solution for industries like frozen food, aggregates, soil, and pet food, and for any company wanting to move to recyclable, “store drop-off” (LDPE #4) mono-material films.
This machine is the answer for heavy-duty applications or for companies prioritising sustainability, where standard VFFS machines and laminate films are unsuitable.
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Instead of constant-heat jaws, these machines use Impulse Sealing (a band or wire that rapidly heats and cools under pressure) or Hot Air/Radiant Sealing combined with Teflon-coated jaws. This is the core technology that makes sealing PE possible.
A critical part of the process. The machine must actively cool the seal (often with a blast of compressed air) while the jaws are still closed. This "sets" the molten PE plastic, ensuring a strong bond and preventing the seal from deforming when the jaws open.
PE film can stretch under tension. These machines often feature robust, high-grip vacuum pull-belts or specially coated friction belts to provide positive, non-slip control, ensuring consistent bag lengths without stretching or deforming the film.
As these machines often handle heavy products (e.g., soil, ice, aggregates), they are typically built with a heavy-gauge steel frame, powerful jaw assemblies, and rugged components designed to withstand the forces of forming, filling, and sealing large, heavy bags.
To manage the "tacky" nature of PE film, the entire film path, especially the forming collar and any guides, is often coated with non-stick materials (like Teflon or special plasma coatings) to reduce friction and ensure a smooth, consistent film feed.
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PE film is a mono-material that melts easily and sticks to standard constant-heat jaws.
These machines typically use impulse sealing (a wire that heats and cools rapidly) or Teflon-coated jaws.
Yes, it is the primary technology for moving to 100% recyclable, “store drop-off” LDPE films.
Yes, the seal must be actively “set” (often with air) while the jaws are closed to prevent deformation.
Common for heavy-duty applications like bags of ice, frozen veg, and soil/aggregates.
