Cardboard Tray

Abstract

A cardboard tray may includea bottom wall part;arranged along the circumference of the bottom wall part, a number of upstanding side wall parts alternated with the same number of upstanding corner wall parts;a circumferential flange composed out of abutting circumferential flange parts, each circumferential flange part being arranged, along a fold line, to the upper edge of one of the upstanding side wall parts;strengthening flange parts arranged, along a fold line, to the upper edge of each upstanding corner wall part, wherein a strengthening flange part is adhered to both circumferential flange parts of the adjacent side wall parts;wherein the circumferential flange has a sealing zone, which extends along the circumferential flange and which spans at least part of the width of said circumferential flange, andwherein the strengthening flange parts at least partially overlap with the sealing zone, when viewed in a direction perpendicular to the sealing zone.

1 . Cardboard tray comprising:
 a bottom wall part;   arranged along the circumference of the bottom wall part, a number of upstanding side wall parts alternated with the same number of upstanding corner wall parts;   a circumferential flange composed out of abutting circumferential flange parts, each circumferential flange part being arranged, along a fold line, to the upper edge of one of the upstanding side wall parts,   wherein the circumferential flange has a sealing zone, which extends along the circumferential flange and which spans at least part of the width of said circumferential flange;   wherein   strengthening flange parts arranged, along a fold line, to the upper edge of each upstanding corner wall part, wherein a strengthening flange part is adhered to both circumferential flange parts of the adjacent side wall parts;   wherein the strengthening flange parts at least partially overlap with the sealing zone, when viewed in a direction perpendicular to the sealing zone.   
     
     
         2 . The cardboard tray according to  claim 1 , wherein the strengthening flange parts fully overlap the sealing zone in width direction of the circumferential flange. 
     
     
         3 . The cardboard tray according to  claim 1 , wherein adjacent upper edges of an upstanding side wall part and adjacent upstanding corner wall part are under an angle of larger than 0° and smaller than 90°, preferably larger than 35° and smaller than 55°, more preferably 45°. 
     
     
         4 . The cardboard tray according to  claim 1 , wherein the combined angle of the abutting edges of two adjacent circumferential flange parts is smaller than the angle between the upper edges of the two upstanding side wall parts of said two adjacent circumferential flange parts. 
     
     
         5 . The cardboard tray according to  claim 1 , wherein at least one longitudinal end of at least one of the circumferential flange parts extending along an adjacent upstanding corner wall part is provided with a glue flap, which is adhered to said upstanding corner wall part. 
     
     
         6 . The cardboard tray according to  claim 1 , wherein at least one of the upstanding side wall parts is provided with a glue flap, which is adhered to the adjacent upstanding corner wall part. 
     
     
         7 . The cardboard tray according to  claim 1 , wherein at least one of the circumferential flange parts comprise at least a first, a second and third elongate flange part section, which are connected parallel and along an elongate edge to each other,
 wherein the first elongate flange part section is arranged to the corresponding upstanding side wall part, the second elongate flange part section is double folded against the first elongate flange part section, and the third elongate flange part section is connected parallel and along an elongate edge to the second elongate flange part section,   wherein the third elongate flange part section is adhered either on the inside or the outside of the corresponding upstanding side wall part.   
     
     
         8 . The cardboard tray according to  claim 1  further comprising a plastic film, which plastic film covers the cardboard tray and is sealed along the circumferential flange at the sealing zone. 
     
     
         9 . The cardboard tray according to  claim 1 , wherein an amount of glue or adhesive is arranged between each strengthening flange part and both corresponding circumferential flange parts, wherein the amount of glue or adhesive extends between the abutting edges of the circumferential flange parts.