A method for providing a non-uniform barrier coating on a hollow container comprising molded pulp
OwnerLars Sandberg, Yselaure Boissard +1inventors
InventorsLars Sandberg, Yselaure Boissard, Shoko Yamada
Life of this patent
Estimating the term…
Abstract
The present disclosure generally relates to a method for providing a non-uniform barrier coating on a hollow container (100) comprising molded pulp. The method comprises depositing a polymeric powder on the interior container surface in at least one predetermined portion (105a-d) of the hollow container and subsequently treating the container with heat or irradiation. The present disclosure also relates to a hollow container (100) comprising a non-uniform polymeric powder coating.
Claims16
A method for providing a non-uniform barrier coating on a hollow container comprising:
- a) providing a hollow container (100) comprising molded pulp, wherein said hollow container (100) comprises a bottom portion (101), a main portion (102) and an upper portion (103), wherein said main portion (102) is arranged between said bottom portion (101) and said upper portion (103), wherein said hollow container comprises a bottom surface (104) and sidewalls (105) extending from said bottom surface (104) to an opening (106) of said hollow container;
- said sidewalls (105) and said bottom surface (104) defining an exterior surface and an interior surface of said hollow container,
- b) depositing a polymeric powder onto said interior surface in at least one predetermined portion (105a-d) of said hollow container by means of a spraying device (107) capable of charging the polymeric powder prior to or during deposition of said polymeric powder,
- c) treating said hollow container with heat or irradiation under conditions that melt and/or cure said polymeric powder,
- wherein the electrical conductivity of said at least one predetermined portion (105a-d) is higher than the electrical conductivity of the remaining portions of said hollow container during said polymeric powder deposition step b).
A hollow container, wherein said hollow container (100) comprises a bottom portion (101), a main portion (102), and an upper portion (103), wherein said main portion (102) is arranged between said bottom portion (101) and said upper portion (103), wherein said hollow container comprises a bottom surface (104) and sidewalls (105) extending from said bottom surface (104) to an opening (106) of said hollow container;
- said sidewalls (105) and said bottom surface (104) defining an exterior surface and an interior surface of said hollow container, wherein said interior surface comprises a barrier coating comprising a polymeric powder, wherein the thickness, t1, of said barrier coating in at least one predetermined portion of the hollow container is higher than the thickness, t2, of said barrier coating in the remaining portions of said hollow container (100).
Dependencies are inferred from the claim text.