Method and apparatus for wrapping hygroscopic food products

A method for wrapping hygroscopic products comprising the following steps:

• feeding a succession of products;
• providing a wrapping device for wrapping the products, the wrapping device including a conveying roller rotatable about an axis of rotation to receive and convey the products in the succession around the axis, and wrapping with the wrapping device each product of the succession in a respective sheet of wrapping material defining a wrapper for the product;
• the wrapping step comprising folding the respective sheet of wrapping material around at least part of a respective product, and sealing to each other at least two edges of the respective sheet of wrapping material along a first, longitudinal sealing line, thereby defining a tubular body in which the product is disposed and having a first open end and a second open end;
• the wrapping step further comprising, at a second sealing station, sealing portions of the tubular body at the first open end and the second open end respectively along a second sealing line and a third sealing line transverse to the first longitudinal sealing line, thereby enclosing the product in the wrapper;
• providing at the second sealing station that the wrapping device comprises a second sealing device and third sealing device, each including a pair of jaws configured to move between an open non-operating configuration to a closed operating configuration clamping the tubular body for heat sealing respective portions of the tubular body, to make the second and third sealing lines;
• the wrapping step further comprising a step of creating a vacuum in the tubular body following the step of sealing the portion of the tubular body along the third sealing line and preceding the step of sealing the portion of the tubular body along the second sealing line;
• wherein the step of creating the vacuum comprises a step of extracting air through both of the first and second open ends of the tubular body.