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Methods for making invisible-type socks are provided. Such methods include steps of manufacturing using a circular knitting machine with latch needles, a decreased knitted heel portion, forming a rear part of an opening or mouth for the introduction of a foot, an intermediate body portion, manufactu

Methods for making invisible-type socks are provided. Such methods include steps of manufacturing using a circular knitting machine with latch needles, a decreased knitted heel portion, forming a rear part of an opening or mouth for the introduction of a foot, an intermediate body portion, manufactured in continuation of the heel portion and forming a front part of the 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. Additionally, the circular knitting machine is supplied with a continuous yarn made of an adhesive synthetic material, in particular silicone, having a count within a predetermined range.

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1. 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 manufac

1. 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, anda toe portion, manufactured in continuation of the intermediate body portion; andsewing to one another respective end edges or selvedges of the intermediate body portion and the toe portion;whereinsaid 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,whereinan 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. 2. The method of claim 1, wherein said continuous yarn has a count of between 400 dtex and 4,500 dtex. 3. The method of claim 1, wherein said upper part of the heel portion is manufactured with at least one knitted course made with said continuous yarn. 4. The method of claim 1, wherein said upper part of the heel portion is manufactured comprising from 1 to 20 knitted courses. 5. The method of claim 1, wherein said upper part of the heel portion is manufactured with at least three knitted courses, corresponding to six strokes. 6. The method of claim 1 wherein a single-cylinder circular knitting machine is used. 7. The method of claim 6, wherein said circular knitting machine has a gauge of between 70 and 18, the gauge being the number of needles present in one inch of the circumference of the single-cylinder. 8. The method of claim 1, wherein a two-cylinder circular knitting machine is used. 9. The method of claim 8, wherein said two-cylinder circular knitting machine has a gauge of between 26 and 3, the gauge being the number of needles present in one inch of the circumference of the two-cylinder. 10. The method of claim 1, wherein said continuous yarn comprises silicone.