Cartons for sandwiches or like foodstuff

1. A carton, for a diagonally cut sandwich or like foodstuff, formed from a blank of card and having triangular end walls connected by rectangular side walls to form a triangular prism-shaped container, one said rectangular side wall of the container being hinged to another wall of the container to provide an opening for insertion/removal of foodstuff and to form a lid for closing the opening, the edges of the opening having out-turned flanges, and the periphery of the lid overlying the out-turned flanges encircling the opening when the lid is in closed position, whereby the lid can be bonded to the flanges to close the carton; wherein the carton is formed from a card which is heat sealable on the surface which forms the inner side of the container, the periphery of the lid of the container being bonded by heat sealing to the out-turned flanges encircling the opening to the container to seal the contents of the container and wherein the bonded lid/flanges are adapted to be torn apart to open the container for access to the food stuff therein by dual parallel lines of partial cut along the flanges, one being at the junction between the flange and the wall adjacent the inside face of the lid and the other part being way across and on the other side of the flange so that the flanges can split to allow the lid to be opened.

2. A carton as claimed in claim 1 , wherein the lid is formed with a projecting tab extending beyond the out-turned flanges of the opening into the container to enable the lid to be separated from the out-turned flanges to which it is bonded to open the container.

3. A carton as claimed in claim 2 , wherein the lid is hinged to the base of one of the triangular end walls, the adjacent side walls and opposite end wall of the container having out-turned flanges with which the periphery of the lid can be bonded.

4. A carton as claimed in claim 1 , claim 2 , or claim 3 , wherein the lid has a window extending at least part of the length of the lid with a clear plastics film extending across the window and sealed to the underside of the lid to enable the contents of the container to be viewed.

5. A carton as claimed in claim 1 , claim 2 , or claim 3 , wherein the heat sealable card from which the container is formed has a coating on its inside face formed from at least one coating selected from the group consisting of polyethylene, a polyester, polypropylene, and acrylic.

6. A carton as claimed in claim 1 or claim 2 , wherein the lid is hinged to one side wall of the container and the adjacent triangular end walls and opposite side wall have out-turned flanges to which the periphery of the lid is bonded to seal the contents of the container.

7. A carton as claimed in claim 1 , wherein the triangular end walls of the carton are formed with fold lines extending from apices of opposing bases to enable the container to be folded flat for storage prior to use.

8. A carton as claimed in claim 7 , wherein the lid is hinged to one triangular end wall of the container and the fold line extending through that side wall to enable the side wall to be folded flat also extends through the lid to enable the lid to fold flat with the side wall.

9. A carton as claimed in claim 7 or claim 8 , wherein said fold lines bisect the end walls of the container.