Liners for bulk containers
AssigneeAmcor Flexibles North America, Inc.
InventorScott J. Kelly
Life of this patent
Estimating the term…
Abstract
Described are liners for bulk containers such as intermediate bulk containers (IBC) that are abuse-resistant and barrier-providing. The liners are recyclable. The liners have at least one sidewall that is multi-plied and the plies are multi-layered. The liners are preferably metal-free and nylon-free. An outer ply comprises at least one discrete polypropylene-based film layer. Addition of polypropylene α-olefin to sealant and/or polypropylene-based film layers also improves performance. Methods of making and using the liners are also provided.
Claims17
A liner for a bulk container, the liner comprising:
- at least one sidewall comprising an outer ply and an inner ply;
- the outer ply being multi-layered and comprising:
- first and second outermost layers,
- one or more discrete polypropylene-based film layers positioned between the first and second outermost layers, the one or more discrete polypropylene-based film layers being present in the outer ply in an amount by weight in a range of greater than or equal to 10% and less than or equal to 50%;
- and
- the inner ply attached to an outer surface of either the first or second outermost layer of the outer ply, the inner ply comprising a polyethylene-based polymer having a density of less than or equal to 0.92 g/cm3;
- a fitment attached to the at least one sidewall,
- the liner comprising an overall polyolefin content of 90% by weight or greater and being suitable for recycling.
A liner for a bulk container, the liner comprising:
- at least one sidewall comprising an outer ply and an inner ply;
- the outer ply being multi-layered and symmetric and comprising:
- first and second outermost sealant layers;
- a core layer positioned at a center of the outer layer;
- a first multilayer stack comprising a first linear low density polyethylene (LLDPE) film layer that is adjacent to a first polypropylene-based film layer that is adjacent to a second linear low density polyethylene (LLDPE) film layer that is adjacent to a second polypropylene-based film layer that is adjacent to a third linear low density polyethylene (LLDPE) film layer, the first multilayer stack being positioned between the first outermost sealant layer and the core layer;
- a second multilayer stack comprising a fourth linear low density polyethylene (LLDPE) film layer that is adjacent to a third polypropylene film layer that is adjacent to a fifth linear low density polyethylene (LLDPE) film layer that is adjacent to a fourth polypropylene film layer that is adjacent to a sixth linear low density polyethylene (LLDPE) film layer, the second multilayer stack being positioned between the second outermost sealant layer and the core layer;
- wherein each of the first, second, third, and fourth polypropylene-based film layers has a content of:
- greater than or equal to 10% to less than or equal to 50% by weight of a polypropylene impact copolymer, and a propylene alpha-olefin copolymer in a range of greater than or equal 0% to less than or equal to 50%;
- the inner ply comprising a linear low density polyethylene (LLDPE) film layer, wherein the LLDPE has a density of less than or equal to 0.92 g/cm3;
- a fitment attached to the at least one sidewall,
- the liner comprising an overall polyolefin content of 90% by weight or greater and being suitable for recycling.
Dependencies are inferred from the claim text.