Methods for the manufacture of invisible type socks

A method for the manufacture of a knitted sock of the so-called invisible type, having no leg portion, extending below an ankle, and comprising a sock body having an opening or mouth for the introduction of a foot, said opening or mouth comprising a front part and a rear part, wherein the manufacture of the sock body comprises the steps of:

• manufacturing, using a circular knitting machine with latch needles:
• a decreased knitted heel portion, forming the rear part of said opening or mouth,
• an intermediate body portion, manufactured in continuation of the heel portion and forming the front part of said opening or mouth, and
• a toe portion, manufactured in continuation of the intermediate body portion;
• and
• sewing to one another respective end edges or selvedges of the intermediate body portion and the toe portion;
• wherein
• said circular knitting machine is supplied with a continuous yarn comprising adhesive synthetic material for adhering the invisible sock to a user's foot, thus opposing a tendency of the invisible sock to bunch up,
• wherein
• an upper part of the heel portion, which defines the rear part of said opening or mouth, is manufactured in said machine, using said continuous yarn,
• and wherein said upper part of the heel portion is turned towards outside, and its end edge or selvedge is attached to an outer surface of the heel portion, in such a way that said upper part of the heel portion has an essentially tubular configuration.