Textile manufactured article for contact fastener, and method and equipment for its production

Claim 2

Textile manufactured article for contact fastener, formed by a textile support wherein an effect yarn is interwoven, which constitutes hooking elements protruding from one side of the same support, characterized in that the textile support is formed by warp yarns interlaced in such a way as to form warp chains tied by at least a first weft yarn, wherein each triplet of warp chains defines, from time to time, two side-by-side couples of warp chains sharing the central warp chain of the triplet, between the two warp chains of each couple of warp chains, a relevant effect yarn being interlaced in a meander path configuration, said effect yarn, constituting said hooking elements, being tied with and blocked by sequences of at least two, and anyway of an even number of consecutive shrunk stitches alternatively belonging to the one, and to the other, of the warp chains of the couple of warp chains in correspondence of their points of tying with said weft yarn, the meander of the effect yarn relevant to a couple of warp chains being staggered in the direction of the warp relatively to the meander of the effect yarn relevant to the side-by-side couple of warp chains by a value equal to the pitch of the same meander, and the yarns forming the warp chains and the effect yarns being constituted by raw materials having a coefficient of thermal shrinking which is considerably larger than that of the raw material constituting said weft yarn.

Claim 3

Textile manufactured article according to claim 1, characterized in that between the warp chains filling warp yarns are inserted, and that a second upper weft yarn is provided, which, together with the first lower weft yarn, ties said filling yarns with one another, with the filling yarns being advantageously constituted by a raw material having a thermal shrinking coefficient larger than of the raw material constituting said weft yarns.

Claim 4

Textile manufactured article according to claim 1 or 2, characterized in that the lengths of the effect yarns between the couples of warp chains form protruding hooking peduncles, with said effect yarns being constituted by monofilaments of a thermoplastic material.

Claim 5

Textile manufactured article according to claim 1 or 2, characterized in that said first weft yarn is constituted by a monofilament.

Claim 6

Textile manufactured article according to claim 1 or 2, characterized in that the yarns forming the warp chains and the filling yarns are of polypropylene, and that the weft yarns are of polyester.

Claim 7

Textile manufactured article according to claim 3, characterized in that the effect yarns are constituted by a monofilament of either polypropylene or of polyamide.

Claim 8

Method for realizing a textile manufactured article for contact fastener according to claim 1, characterized in that it comprises the steps of: forming on a knitting machine, and in particular on a machine for warp knit fabric manufacturing, a textile support constituted by warp chains and at least a first weft yarn, for the yarns destined to form the warp chains a raw material being used, which has a thermal shrinking coefficient which is considerably larger than of the raw material used for the weft yarn; of interweaving in said textile support effect yarns which are constituted by a raw material also having a thermal shrinking coefficient larger than that of the raw material which constitutes the weft yarn, with the interweaving of the effect yarns in the support textile being carried out in such a way that each of them is interlaced in a meander path configuration between two warp chains, wherein each triplet of warp chains defines, from time to time, two side-by-side couples of warp chains sharing the central warp chain of the triplet, with the relevant effect yarn being tied by sequences of at least two, and anyway of an even number, of consecutive stitches alternatively belonging to the one, and to the other, of the warp chains of the couple of warp chains in correspondence of their points of tying with said weft yarn; and forming, along the lengths of the effect yarn between the two relevant warp chains, and oriented according to the weft direction, slots protruding from one side of the textile support, wherein the meander of the effect yarn relevant to a couple of warp chains is staggered in the direction of the warp relatively to the meander of the effect yarn relevant to the side-by-side couple of warp chains by a value equal to the pitch of the same meander; and submitting the so-formed textile manufactured article, immediately downstream the formation of the slots along the lengths of effect yarns oriented in the weft direction, to the action of heat, in order to cause the thermal shrinking of the stitches of the warp chains and of the effect yarns.

Claim 9

Method according to claim 7 for realizing a textile manufactured article according to claim 2, characterized in that in the formation of the textile support, filling warp yarns are inserted between the warp chains, and that such filling yarns are tied by means of said first lower weft yarn and of a second upper weft yarn.

Claim 10

Method according to claim 7 or 8 for realizing a textile manufactured article according to claim 3, characterized in that effect yarns are used, which are constituted by monofilaments, and after the step wherein the manufactured article is submitted to the action of heat, a step of cutting of the slots formed by the effect yarns and of formation of the hooking peduncles, is carried out.

Claim 11

Equipment for practicing the method according to claim 7, characterized in that it comprises a knitting machine capable of forming a textile support with warp chains, equipped with means for inserting at least one weft, and with means for feeding and interweaving effect yarns between couples of warp chains, between the needles forming said warp chains stationary blades being positioned, which extend in the direction of the warp on planes perpendicular to the plane of the textile support being formed, and initially having a constant height, and then a height decreasing towards their free end, as well as heating means being provided, which extend throughout the width of the textile manufactured article, and in the direction of the warp, substantially through the whole length of the blades along which they have a decreasing height.

Claim 12

Equipment according to claim 10, characterized in that said heating means are constituted by a temperature-controlled heating plate.