A method for wrapping hygroscopic products includes feeding a succession of products and wrapping each product in wrapping material to define a wrapper for the product, The wrapping includes 1) folding a sheet of wrapping material into a U-shape around a respective product and sealing to each other at least two edges of the sheet of wrapping material along a first, longitudinal sealing line defining a tubular body in which the product is disposed and having a first and a second open end; 2) sealing two portions of the tubular body along second and third sealing lines transverse to the first longitudinal sealing line, thereby enclosing the product in the wrapper; and 3) creating a vacuum in the tubular body before the sealing the portions of the tubular body along at least one between the second and the third sealing lines.

A method for wrapping hygroscopic products includes feeding a succession of products and wrapping each product in wrapping material to define a wrapper for the product, The wrapping includes 1) folding a sheet of wrapping material into a U-shape around a respective product and sealing to each other at least two edges of the sheet of wrapping material along a first, longitudinal sealing line defining a tubular body in which the product is disposed and having a first and a second open end; 2) sealing two portions of the tubular body along second and third sealing lines transverse to the first longitudinal sealing line, thereby enclosing the product in the wrapper; and 3) creating a vacuum in the tubular body before the sealing the portions of the tubular body along at least one between the second and the third sealing lines.

A method for wrapping hygroscopic products includes feeding a succession of products and wrapping each product in wrapping material to define a wrapper for the product. The wrapping including 1) folding a sheet of wrapping material into a U-shape around at least part of a respective product and sealing to each other at least two edges of the sheet of wrapping material along a first, longitudinal sealing line defining a tubular body in which the product is disposed and having a first and a second open end; 2) sealing at least two portions of the tubular body along a second and a third sealing line transverse to the first longitudinal sealing line, thereby enclosing the product in the wrapper; and 3) creating a vacuum in the tubular body before the sealing the portions of the tubular body along at least one between the second and the third sealing line.

A method for wrapping hygroscopic products includes feeding a succession of products and wrapping each product in wrapping material to define a wrapper for the product. The wrapping including 1) folding a sheet of wrapping material into a U-shape around at least part of a respective product and sealing to each other at least two edges of the sheet of wrapping material along a first, longitudinal sealing line defining a tubular body in which the product is disposed and having a first and a second open end; 2) sealing at least two portions of the tubular body along a second and a third sealing line transverse to the first longitudinal sealing line, thereby enclosing the product in the wrapper; and 3) creating a vacuum in the tubular body before the sealing the portions of the tubular body along at least one between the second and the third sealing line.

This manufacturing method for wrapped moldings (P) comprises a molding process for manufacturing the moldings (P) and a wrapping process for wrapping the moldings (P). The molding cycle from a mold-clamping step to the next mold-clamping step in the molding process is coordinated with the wrapping cycle from a moving step to the next moving step in the wrapping process by delaying the heating initiation time in the heating step, reducing the rate of temperature increase in the heating step, or prolonging the time for the drawing in the drawing step.

This manufacturing method for wrapped moldings (P) comprises a molding process for manufacturing the moldings (P) and a wrapping process for wrapping the moldings (P). The molding cycle from a mold-clamping step to the next mold-clamping step in the molding process is coordinated with the wrapping cycle from a moving step to the next moving step in the wrapping process by delaying the heating initiation time in the heating step, reducing the rate of temperature increase in the heating step, or prolonging the time for the drawing in the drawing step.