Packaging laminate with excellent sealing and barrier properties and also packaging container manufactured from the packaging laminate
AssigneeTetra Laval Holdings & Finance S.A.
Inventor.ANG.ke Rosen
Life of this patent
Estimating the term…
Abstract
Packaging laminate with excellent sealing and barrier properties comprising a skeletal layer (11) of plastic and filler mixed in the plastic and a barrier layer (12) of plastic of the same type as the plastic in the skeletal layer in a mixture with plastic of another type than the plastic in the skeletal layer, placed against one side of the skeletal layer. In order to improve the sealing properties of the packaging laminate the barrier layer (12) has been provided with electrically conducting material finely distributed in the barrier layer, preferably soot (carbon black) with the aid of which the packaging laminate can be sealed by means of inductive heating (IH) and dielectric sealing.
Claims8
The process for the manufacture of an aseptic packaging container comprising:
- making a flexible packaging laminate having a skeletal layer with an inner side and an outer side and a barrier layer on the inner side of the skeletal layer, said skeletal layer comprising a mixture of plastic and filler wherein the amount of filler in the skeletal layer is in the range of 50 to 80% by weight of the skeletal layer, and said barrier layer comprising a mixture of plastic of the same type as the plastic in the skeletal layer, plastic of a different type from the plastic in the skeletal layer with said different type of plastic providing oxygen impermeability to the barrier layer, and an electrically conductive material in a fine particle form which allows the laminate to be heat sealable by inductive heating or dielectric sealing, and
- mechanically forming and heat sealing by inductive heating or dielectric sealing the flexible packaging laminate into a container.
Dependencies are inferred from the claim text.