Paperboard blanks having a shrinkable film adhered thereto and paperboard container made therefrom
Blanks and paper products made therefrom are provided. In one aspect, the blank for forming a paper product can include a paperboard substrate and a film. At least a portion of the film can be secured to the paperboard substrate with an adhesive disposed between the paperboard substrate and the film. A peel strength of less than 330 g/2.54 cm at a temperature of 23° C. can be required to separate the film secured to the paperboard substrate with the adhesive.
1. A blank for forming a paper product, comprising:
a paperboard substrate comprising a perimeter and an interior region therebetween, the perimeter having a top and bottom side that are arcuate, and a right and left side that are substantially straight; and
a shrinkable film at least partially secured to each of the top, bottom, left and right sides of the perimeter of the paperboard substrate with an adhesive disposed between the paperboard substrate and the shrinkable film, whereby a portion of the interior region of the paperboard substrate and the shrinkable film is free of the adhesive, and wherein a peel strength of less than 330 g/2.54 cm at a temperature of 23° C. is required to separate the shrinkable film from the paperboard substrate where the shrinkable film is secured to the paperboard substrate with the adhesive.
2. The blank of claim 1 , wherein the shrinkable film comprises a biaxially oriented heat shrinkable polymeric material.
3. The blank of claim 1 , wherein the adhesive has a storage modulus of about 1.8 MPa or more at a temperature of about 40° C. and a measurement frequency of 1 Hz.
4. The blank of claim 1 , wherein the adhesive has a loss modulus of about 0.5 MPa or more at a temperature of 40° C. and a measurement frequency of 1 Hz.
5. The blank of claim 1 , wherein the peel strength is less than about 300 g/2.54 cm at a temperature of about 23° C.
6. The blank of claim 1 , wherein the adhesive has a storage modulus of at least 3 MPa at a temperature of 40° C. and a measurement frequency of 1 and wherein the peel strength is less than about 300 g/2.54 cm at a temperature of about 23° C.
7. The blank of claim 1 , wherein the adhesive has a storage modulus of at least 3.5 MPa at a temperature of 40° C. and a measurement frequency of 1 Hz, a loss modulus of at least 0.8 MPa at a temperature of 40° C. and a measurement frequency of 1 Hz, and wherein the peel strength is less than about 290 g/2.54 cm at a temperature of about 23° C.
8. The blank of claim 1 , wherein the paperboard substrate has one or more apertures formed therethrough.
9. The blank of claim 1 , wherein the paperboard substrate comprises a first outer layer, a second outer layer, and an intermediate layer disposed between the first and second outer layers, and wherein the intermediate layer comprises paperboard and the first and second outer layers comprise a polyolefin.
10. The blank of claim 1 , wherein the portion of the interior region of the paperboard substrate and the shrinkable film that is free of the adhesive allows the shrinkable film to move away from the paperboard substrate.
11. The blank of claim 1 , wherein the adhesive is disposed as a plurality of dots.
12. The blank of claim 1 , wherein the adhesive is disposed as a plurality of discontinuous lines.
13. The blank of claim 1 , wherein the adhesive is disposed as a continuous line.
14. A paperboard container, comprising:
a sidewall comprising a perimeter and an interior region therebetween, the perimeter having a top and bottom side that are arcuate, and a right and left side that are substantially straight; and
a bottom panel secured to the bottom side of the sidewall, wherein the sidewall comprises:
an inner surface comprising a shrinkable film;
an outer surface comprising a paperboard substrate; and
a brim formed by curling the top side of the sidewall, wherein the shrinkable film is at least partially secured to each of the top, bottom, left and right sides of the perimeter of the paperboard substrate with an adhesive disposed between the paperboard substrate and the shrinkable film whereby a portion of the interior region of the paperboard substrate is free of the adhesive, and wherein a peel strength of less than 330 g/2.54 cm at a temperature of 23° C. is required to separate the shrinkable film from the paperboard substrate where the shrinkable film is secured to the paperboard substrate with the adhesive.
15. The paperboard container of claim 14 , wherein the shrinkable film comprises a biaxially oriented heat shrinkable polymeric material.
16. The paperboard container of claim 14 , wherein the adhesive has a storage modulus of about 1.8 MPa or more at a temperature of 40° C. and a measurement frequency of 1 Hz.
17. The paperboard container of claim 14 , wherein the adhesive has a loss modulus of about 0.5 MPa or more at a temperature of 40° C. and a measurement frequency of 1 Hz.
18. The paperboard container of claim 14 , wherein the adhesive has a storage modulus of at least 3 MPa at a temperature of 40° C. and a measurement frequency of 1 and wherein the peel strength is less than about 300 g/2.54 cm at a temperature of about 23° C.
19. The paperboard container of claim 14 , wherein the paperboard substrate has one or more apertures formed therethrough.
20. A method for making a paperboard container, comprising:
applying an adhesive about a perimeter of a paperboard substrate that comprises a perimeter and an interior region therebetween, the perimeter having a top and bottom side that are arcuate, and a right and left side that are substantially straight;
locating a shrinkable film onto the paperboard substrate to produce a blank, whereby the shrinkable film is at least partially secured to each of the top, bottom, left and right sides of the perimeter of the paperboard substrate with the adhesive disposed between the paperboard substrate and the shrinkable film, and whereby a portion of the interior region of the paperboard substrate and the shrinkable film is free of the adhesive,
and wherein a peel strength of less than 330 g/2.54 cm at a temperature of 23° C. is required to separate the shrinkable film from the paperboard substrate where the shrinkable film is secured to the paperboard substrate with the adhesive;
overlapping two opposing peripheries of the blank to form a sidewall, wherein the sidewall comprises:
an inner surface comprising the film and an outer surface comprising the paperboard substrate, and
a first edge adapted to be curled to form a brim curl;
securing a bottom panel to the sidewall proximate a second edge of the sidewall, the second edge opposing the first edge of the sidewall; and
curling the first edge of the sidewall to form the brim curl.
21. The method of claim 20 , wherein the paperboard substrate comprises one or more apertures formed therethrough and wherein the shrinkable film shrinks when contacted with a fluid at a temperature of up to about 100° C. to provide a paperboard container having a shrunk film and a gap located between at least a portion of the shrunk film and the paperboard substrate.
22. The method of claim 20 , wherein the adhesive has a storage modulus of about 1.8 MPa or more at a temperature of 40° C. and a measurement frequency of 1 Hz.
23. The method of claim 20 , wherein the adhesive has a storage modulus of at least 3 MPa at a temperature of 40° C. and a measurement frequency of 1 Hz, and wherein the is less than about 300 g/2.54 cm at a temperature of about 23° C.
24. The method of claim of claim 20 , wherein the adhesive has a storage modulus of at least 3.5 MPa at a temperature of 40° C. and a measurement frequency of 1 Hz and a loss modulus of at least 0.8 MPa at a temperature of 40° C. and a measurement frequency of 1 Hz, and wherein the peel strength is less than about 290 g/2.54 cm at a temperature of about 23° C.
25. The method of claim 20 , wherein the paperboard substrate comprises one or more apertures formed therethrough, wherein the sidewall and the bottom panel define a product volume adapted to contain a liquid, an area of the shrinkable film decreases in an amount of about 10% to about 40% when a liquid at a temperature of up to about 100° C. is introduced into the product volume.