Granted Patent B2

US 12,420,999 · App. 18/089,031 · Granted Sep 23, 2025

Inventors: Manfred Schäfer (Cologne, DE); Axel Niemöller (Düren, DE); Ronny Kunze (Schenkelberg, DE); Steffen Ohr (Sursee, CH)

Assignee: Sihl GmbH

B65D65/22B65D65/16B65D65/42B65D65/466B65D2565/382

Abstract

Claims (47)

1. An inkjet printable twist and/or fold wrap film for packaging applications comprising:

(a) a non-oriented polymer film, wherein the non-oriented polymer film (a) is a regenerated cellulose film;

(b) at least one ink-receiving layer comprising inorganic particles and a binder coated over one surface of the non-oriented polymer film (a) at a dry coating weight being in the range of from 8 to 30 g/m 2 ; and

(c) an adhesion promoting layer between the non-oriented polymer film (a) and the at least one ink-receiving layer (b).

2. The inkjet printable twist and/or fold wrap film according to claim 1 , wherein the inkjet printable twist and/or fold wrap film without the ink-receiving layer has a film thickness in the range of from 15 to 50 μm; and/or

wherein the non-oriented polymer film (a) is transparent, translucent, metallized or opaque; and/or

wherein the adhesion promoting layer (c) comprises (co)polyester; polyvinylidene chloride; vinylchloride vinylacetate copolymer; (meth)acrylic (co)polymer; nitrocellulose; ethylene acrylic acid copolymer; or copolymers or combinations thereof.

3. The inkjet printable twist and/or fold wrap film according to claim 1 , wherein the inorganic particles comprise aluminum oxide particles, aluminum hydroxide particles, silica particles, or combinations thereof; and/or

wherein the binder comprises polyvinyl alcohol; polyvinyl alcohol derivatives; polyethylene oxide; polyvinylmethylether; cellulose derivatives; polyvinylpyrrolidone; polymer dispersions or emulsions; or combinations thereof; and/or

wherein the ink-receiving layer (b) comprises the inorganic particles and the binder in a weight ratio ranging from 2:1 to 20:1.

4. The inkjet printable twist and/or fold wrap film according to claim 1 , further comprising a barrier layer positioned between the non-oriented polymer film (a) and the ink-receiving layer (b) and/or over the surface of the non-oriented polymer film (a) opposite to the surface over which the ink-receiving layer (b) is formed;

and/or

further comprising a sealing layer positioned over the surface of the non-oriented polymer film (a) opposite to the surface over which the ink-receiving layer (b) is formed.

5. The inkjet printable twist and/or fold wrap film according to claim 1 , having a twist retention of more than 350° and/or a dead fold retention of at least 100°.

6. The inkjet printable twist and/or fold wrap film according to claim 1 , having a thickness of from 20 to 100 μm; and/or

comprising up to 50 wt.-% of the ink-receiving layer (b), based on the total weight of the inkjet printable twist and/or fold wrap film; and/or

being industrially compostable and/or home compostable.

7. A method for preparing the inkjet printable twist and/or fold wrap film according to claim 1 , comprising the steps:

(a) providing a non-oriented polymer film being a regenerated cellulose film;

(b) applying an adhesion promoting layer over at least a part of one surface of the non-oriented film (a);

(c) coating the surface of the non-oriented polymer film comprising the adhesion promoting layer (b) with a ink-receiving layer composition comprising inorganic particles and a binder at a dry coating weight being in the range of 8 to 30 g/m 2 .

8. An inkjet printed twist and/or fold wrap film obtained by printing of an inkjet printable twist and/or fold wrap film comprising: (a) a non-oriented polymer film, wherein the non-oriented polymer film (a) is a regenerated cellulose film; (b) at least one ink-receiving layer comprising inorganic particles and a binder coated over one surface of the non-oriented polymer film (a) at a dry coating weight being in the range of from 8 to 30 g/m 2 ; (c) an adhesion promoting layer between the non-oriented polymer film (a) and the at least one ink-receiving layer (b); and (d) and overprint varnish layer as an outer layer over the printed ink-receiving layer (b); or

prepared by (a) providing a non-oriented polymer film being a regenerated cellulose film; (b) applying an adhesion promoting layer over at least a part of on surface of the non-oriented film (a); (c) coating the surface of the non-oriented polymer film comprising the adhesion promoting layer (b) with a ink-receiving layer composition comprising inorganic particles and a binder at a dry coating weight being in the range of 8 to 30 g/m 2 and further applying an overprint varnish layer (d) as an outer layer over the printed ink-receiving layer (b).

9. The inkjet printed twist and/or fold wrap film according to claim 8 , printed by inkjet printing; and/or

wherein the overprint varnish layer (d) has a thickness of 0.5 to 5 μm.

10. The inkjet printed twist and/or fold wrap film according to claim 8 , having a twist retention of more than 350° and/or

a dead fold retention of at least 100°; and/or

exhibiting a coefficient of friction (CoF) film to film of the surface on the side of the ink-receiving layer to itself and/or the surface opposite to the side of the ink receiving layer to itself of less than 0.45.

11. A method for preparing the inkjet printed twist and/or fold wrap film according to claim 8 , comprising the steps:

(a) providing an inkjet printable twist and/or fold wrap film comprising: (a) a non-oriented polymer film, wherein the non-oriented polymer film (a) is a regenerated cellulose film; (b) at least one ink-receiving layer comprising inorganic particles and a binder coated over one surface of the non-oriented polymer film (a) at a dry coating weight being in the range of from 8 to 30 g/m 2 ; (c) an adhesion promoting layer between the non-oriented polymer film (a) and the at least one ink-receiving layer (b); and (d) and overprint varnish layer as an outer layer over the printed ink-receiving layer (b); or

prepared by (a) providing a non-oriented polymer film being a regenerated cellulose film; (b) applying an adhesion promoting layer over at least a part of on surface of the non-oriented film (a); (c) coating the surface of the non-oriented polymer film comprising the adhesion promoting layer (b) with a ink-receiving layer composition comprising inorganic particles and a binder at a dry coating weight being in the range of 8 to 30 g/m 2 ;

(b) printing of the ink-receiving layer of the inkjet printable twist and/or fold wrap film; and

(c) applying an overprint varnish as an outer layer over the printed ink-receiving layer.

12. A packaging comprising the inkjet printable twist and/or fold wrap flexible film according to claim 1 .

13. The packaging of claim 12 , wherein the packaging comprises a packaging for food, pet food, beverages, pharmaceuticals and/or personal care products.

14. A method of making a filled packaging comprising the steps of:

(i) providing the inkjet printed twist and/or fold wrap film according to claim 8 ;

(ii) positioning goods onto the inkjet printed twist and/or wrap film;

(iii) wrapping the goods with the inkjet printed twist and/or wrap film and closing the wrapping by means of twisting or folding the inkjet printed twist and/or wrap film around the goods; and

(iv) optionally partially sealing the packaging film.

15. A packaging comprising the inkjet printed twist and/or fold wrap film according to claim 8 .

16. The packaging of claim 15 , wherein the packaging comprises a packaging for food, pet food, beverages, pharmaceuticals and/or personal care products.

17. A method of making a filled packaging comprising the steps of:

(i) providing the inkjet printed twist and/or fold wrap film prepared by the method according to claim 11 ;

(ii) positioning goods onto the inkjet printed twist and/or wrap film;

(iii) wrapping the goods with the inkjet printed twist and/or wrap film and closing the wrapping by means of twisting or folding the inkjet printed twist and/or wrap film around the goods; and

(iv) optionally partially sealing the packaging film.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)