Packaging box, blank, method and apparatus for forming the same

A packaging box comprising:

• a base portion defining a first plane;
• and
• at least one first side wall portion arranged at an angle to the base portion, the first side wall portion being joined to the base portion via a fold line at a first edge of the base portion,
• the first side wall portion having a pair of extension portions extending from opposite edges of the first side wall portion so as to provide at least part of a pair of second side wall portions arranged at an angle to the base portion and at an angle to the first side wall portion,
• each side wall portion of the pair of second side wall portions comprising at least part of one of the pair of extension portions extending from the first side wall portion,
• a connecting portion of each extension portion connecting the first side wall portion to one of the pair of second side wall portions being smoothly curved;
• at least one side tab portion arranged at an angle to the base portion and being joined to the base portion via a fold line at an edge of the base portion such that the side tab portion lies against a surface of the respective extension portion of the first side wall portion;
• and
• at least one lid portion, the at least one lid portion being joined to the side tab portion via a fold line and extending at an angle to the respective first side wall portion for at least partially closing the packaging box,
• wherein the pair of extension portions extending from opposite edges of the first side wall portion forming at least part of the pair of second side wall portions are planar and parallel to the other.