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A spreading head particularly for spreading one or more adhesives or mixtures of adhesives, of the hot-melt or cold type, comprising a body for conveying the one or more adhesives to an extrusion tool; the body has two or more ducts, which are all separate or of which two or more converge, and the t

A spreading head particularly for spreading one or more adhesives or mixtures of adhesives, of the hot-melt or cold type, comprising a body for conveying the one or more adhesives to an extrusion tool; the body has two or more ducts, which are all separate or of which two or more converge, and the tool has one or more first extrusion channels and/or one or more mixing chambers which are connected to one or more second extrusion channels, the first and/or second extrusion channels being optionally mutually superimposed and/or laterally adjacent.

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1. A spreading head for spreading adhesives onto a substrate, comprising: an extrusion tool in fluid communication with at least a first adhesive and a second adhesive for application onto said substrate;a body for conveying said first adhesive and said second adhesive to said extrusion tool;two or

1. A spreading head for spreading adhesives onto a substrate, comprising: an extrusion tool in fluid communication with at least a first adhesive and a second adhesive for application onto said substrate;a body for conveying said first adhesive and said second adhesive to said extrusion tool;two or more ducts formed within said body for introducing in said ducts said first and second adhesives, said ducts being mutually separate ducts such that said first and second adhesives are introduced mutually separately in said ducts;for each respective duct of said ducts, a plurality of feed channels formed within said body and exiting from each respectively duct and distributed and spaced along a longitudinal extension of each respective duct, and said plurality of feed channels connected in output to said extrusion tool by a plurality of valves which allow to selectively feed through said plurality of feed channels into said extrusion tool said first and second adhesives from said ducts; anda plurality of extrusion channels comprising at least two extrusion channels that are arranged mutually laterally adjacent in said extrusion tool with respect to a width of said extrusion tool, said two mutually laterally adjacent extrusion channels being connected with respective ones of said feed channels such that said first and second adhesives introduced mutually separately in said two mutually separate ducts also being capable of exiting mutually separately from said two mutually laterally adjacent extrusion channels so as to obtain at least two layers of adhesive which are arranged laterally mutually adjacent on said substrate and which include said first adhesive which is arranged laterally mutually adjacent to said second adhesive on said substrate. 2. The spreading head of claim 1, wherein said plurality of extrusion channels comprise first extrusion channels and second extrusion channels and said body has two separate ducts and said tool has one or more mixing chambers which are connected to one or more of said second extrusion channels, said second extrusion channels being mutually laterally adjacent. 3. The spreading head of claim 1, wherein said plurality of extrusion channels comprise first extrusion channels and second extrusion channels and said body has two separate ducts and wherein said first and second extrusion channels have, along a longitudinal axis with respect to said extrusion tool, reduced lengths that are mutually parallel and are perpendicular to said longitudinal axis. 4. The spreading head of claim 1, wherein said body has two separate ducts and said tool has one or more first extrusion channels which are mutually laterally adjacent and are spaced by one or more additional first extrusion channels which have a different shape and arrangement with respect to the remaining ones among said first extrusion channels. 5. The spreading head of claim 1, wherein said body has two separate ducts and said tool has one or more first extrusion channels which are mutually superimposed in pairs and are laterally adjacent in pairs with respect to each other. 6. The spreading head of claim 1, wherein said body has three ducts, two of which converge, and wherein said tool has at least two first extrusion channels which are mutually superimposed in pairs and are laterally adjacent in pairs with respect to each other. 7. The spreading head of claim 1, wherein said body has three distinct ducts comprising a first duct, a second duct, and a third duct, and said tool has at least two first extrusion channels which are mutually superimposed in pairs and are mutually laterally adjacent in pairs, and at least one second extrusion channel which is superimposed on each pair of said first extrusion channels. 8. The spreading head of claim 7, wherein said first duct and said second duct being approximately mutually parallel and affecting said body longitudinally, and having respectively one or more first and second accesses for said adhesives, said first and second ducts being mutually connected internally with respect to said body. 9. The spreading head of claim 8, wherein said first and second ducts are connected respectively to one or more first and one or more second output ducts which converge in pairs, with the interposition of first and second valves, in suitable mixing channels, from each of which there protrudes at least one first feed channel which is connected in output to said extrusion tool. 10. The spreading head of claim 9, wherein said one or more first and second output ducts are also formed along axes which are substantially perpendicular to said first and second duct, said one or more first and second output ducts being distributed, so that they are equidistant, respectively along said first and second ducts. 11. The spreading head of claim 10, wherein said third duct is approximately parallel to said first and second ducts, affects longitudinally said body, and has one or more third accesses for said adhesives, one or more second feed channels protruding from said third duct and being connected in output to said extrusion tool and being connected to said third duct by means of third valves. 12. The spreading head of claim 11, wherein the outputs of said second feed channels and of said first feed channels are mutually aligned approximately according to a same axis longitudinally with respect to said body, said second feed channels being formed along axes which are substantially perpendicular to the longitudinal axis of said third duct and being distributed, so that they are equidistant, along said third duct. 13. The spreading head of claim 11, wherein said body has a fourth duct, which is approximately parallel to said first, second and third ducts, affects longitudinally said body, and is provided with fourth accesses for said adhesives, one or more third feed channels protruding from said fourth duct and being connected in output to said extrusion tool and connected to said fourth duct by means of fourth valves. 14. The spreading head of claim 13, wherein the outputs of said third feed channels are aligned approximately along an axis which is arranged longitudinally with respect to said body and is substantially parallel and spaced with respect to the axis along which the outputs of said first and second feed channels are aligned, said third feed channels being formed along axes which are substantially perpendicular to the longitudinal axis of said fourth duct, and being distributed along said fourth duct. 15. The spreading head of claim 13, wherein said body has a fifth duct, which is approximately parallel to said first, second and third ducts and affects longitudinally said body, and is provided with fourth accesses for said adhesives, one or more fourth feed channels protruding from said fifth duct and being connected in output to said extrusion tool and connected to said fifth duct by means of fifth valves. 16. The spreading head of claim 15, wherein the outputs of said fourth feed channels are aligned approximately along an axis which is arranged longitudinally with respect to said body and is substantially parallel and spaced with respect to the axes on which the outputs of said first and second feed channels and of said third feed channels are aligned, said fourth feed channels being formed on axes which are substantially perpendicular to the longitudinal axes of said fifth duct and being distributed along said fifth duct. 17. The spreading head of claim 16, wherein said extrusion tool is constituted by at least one lower element which can be fixed to said contiguous body and is approximately shaped like a parallelepiped with a transverse cross-section shaped like a right-angled trapezoid arranged with its shorter parallel side in engagement with said body and with its longer parallel side directed away from it. 18. The spreading head of claim 17, wherein one or more first extrusion channels are formed within said at least one lower element and are mutually superimposed and laterally adjacent, each channel being connected in input to one of said one or more first and/or second and/or third and/or fourth feed channels which exit from said body. 19. The spreading head of claim 18, wherein said one or more first extrusion channels are connected respectively to said one or more third feed channels or to said one or more fourth feed channels formed within said body. 20. The spreading head of claim 19, wherein said extrusion tool has one or more pairs of first extrusion channels which are arranged in pairs and are mutually superimposed and also mutually laterally adjacent in pairs, the longitudinal extension of said first extrusion channels of each of said pairs being identical. 21. The spreading head of claim 20, wherein in each of said pairs of said first mutually superimposed extrusion channels, the outlet of the channel which, among said extrusion channels, is also referenced as rear channel and lies furthest from the perimetric edge of said longer parallel side of said at least one lower element which is directed, during use, toward the substrate onto which said adhesives are to be spread, is located, with respect to a lamination plane, at a higher level than the other adjacent first channel, also referenced as front channel. 22. The spreading head of claim 21, wherein the plane of arrangement of said first front extrusion channel which is adjacent to said first rear extrusion channel is arranged at a lower level than said first rear extrusion channel in order to allow the extrusion of two superimposed layers of adhesive. 23. The spreading head of claim 2, wherein said extrusion tool has one or more additional first extrusion channels which have different configurations and arrangements with respect to said first extrusion channels. 24. The spreading head of claim 23, wherein said additional first extrusion channels are arranged along an axis which is perpendicular to the axis of said first extrusion channels and are interposed between each of said pairs of said first extrusion channels. 25. The spreading head of claim 24, wherein said additional first extrusion channels start from said perimetric edge of said longer parallel side of said at least one lower element which is directed toward said substrate during use. 26. The spreading head of claim 17, wherein said plurality of extrusion channels comprise first extrusion channels and second extrusion channels and in said at least one lower element of said extrusion tool there are one or more mixing chambers, each of which is connected to one or more said second extrusion channels, which are superimposed and laterally adjacent to each other and to said first extrusion channels. 27. The spreading head of claim 26, wherein said second extrusion channels are mutually laterally adjacent, each of said channels being superimposed on one of said pairs of said first extrusion channels. 28. The spreading head of claim 27, wherein the shape and size of said second extrusion channels follows the shape and size of said first extrusion channels at each of said pairs of said channels on which they are superimposed. 29. The spreading head of claim 28, wherein the plane of arrangement of each of said second extrusion channels is arranged at a higher level than said adjacent first rear extrusion channel. 30. The spreading head of claim 26, wherein each of said mixing chambers is connected to at least one of said first and second feed channels formed inside said body. 31. The spreading head of claim 28, wherein said pairs of said first extrusion channels and of said second extrusion channels which are mutually superimposed have mutually different or identical extensions. 32. The spreading head of claim 25, wherein on said longer parallel side of said at least one lower element of said extrusion tool there is a slit which affects the outlet at least of said first front extrusion channels, said slit arranging on a lower plane the outlet of said first front extrusion channel with respect to the plane of arrangement of said first rear extrusion channel and of said second extrusion channel, said slit guiding the outflow of the layer or layers of said adhesives from said extrusion tool onto said substrate. 33. The spreading head of claim 32, wherein one or more of said first extrusion channels and/or of said additional first extrusion channels and/or of said second extrusion channels have reduced lengths along an axis which is longitudinal with respect to said lower element. 34. The spreading head of claim 33, wherein said extrusion channels with reduced length are arranged at right angles to said first and second extrusion channels and are mutually parallel. 35. The spreading head of claim 34, wherein the shape of said extrusion channels with reduced length with respect to said longer parallel side of said lower element of said extrusion tool is comb-shaped, with teeth which have two mutually different lengths and are arranged alternately. 36. The spreading head of claim 35, wherein said first and second extrusion channels with reduced length are interposed between two of said pairs of said first and second extrusion channels. 37. The spreading head of claim 26, wherein said extrusion tool comprises at least one upper element, which can be fixed to said longer parallel side of said at least one lower element and is suitable to abut against said adhesives which protrude from said first and second channels formed in said at least one lower element, so as to guide said adhesives to exit from said slits. 38. The spreading head of claim 37, wherein said body has only said first and third ducts, from which said one or more first and second feed channels protrude respectively through said one or more first valves and one or more third valves, said extrusion tool having only said one or more mixing chambers, each of which is connected in input to one of said one or more first feed channels and to one of said one or more second feed channels and in output to one of said second extrusion channels, said second extrusion channels being laterally mutually adjacent. 39. The spreading head of claim 38, wherein said body has said third and fourth ducts, from which said one or more second and third feed channels protrude respectively through said one or more third and fourth valves, said extrusion tool having extrusion channels with reduced length, which are arranged in a comb-like configuration and are mutually alternated and are connected in input respectively to said one or more second feed channels and to said one or more third feed channels. 40. The spreading head of claim 38, wherein said body has said third and fourth ducts from which said one or more second and third feed channels protrude respectively through said one or more third and fourth valves, said extrusion tool having said second extrusion channels and said additional first extrusion channels, which are smaller, arranged between said second extrusion channels. 41. The spreading head of claim 38, wherein said body has said third and fourth ducts from which said one or more second and third feed channels protrude respectively through said one or more third and fourth valves, said extrusion tool having a series of said first extrusion channels which are arranged below said second extrusion channels. 42. The spreading head of claim 38, wherein said body has said first duct and said second duct, which mutually converge in said mixing chamber with the interposition of said first and second valves, and said fifth duct, which is connected by means of said fifth valves to said one or more fourth feed channels, said extrusion tool having a series of said first extrusion channels arranged below said second extrusion channels. 43. The spreading head of claim 38, wherein said body has said third, fourth and fifth ducts, which are connected respectively, by means of said third, fourth and fifth valves, to said one or more second, third and fourth feed channels, said extrusion tool having a plurality of pairs of said first extrusion channels which are arranged below a said second extrusion channel and are mutually laterally adjacent. 44. The spreading head of claim 38, wherein said extrusion tool is constituted by a single block which is superimposed, with its lower surface, on the underlying upper surface of said body at the outlets of said first, second, third and fourth feed channels. 45. The spreading head of claim 44, wherein said first extrusion channels are each constituted by a first cavity which is formed in the lower surface of said extrusion tool and faces the outlet of one of said first, second, third and fourth feed channels. 46. The spreading head of claim 45, wherein said first cavities face respectively said third and fourth feed channels formed within said body. 47. The spreading head of claim 46, wherein it has one or more pairs of first cavities which are arranged in pairs so as to be mutually superimposed and also laterally adjacent in pairs with respect to each other. 48. The spreading head of claim 47, wherein each of said mixing chambers and the respective one or more second extrusion channels are constituted by a single second cavity, which is formed in said lower surface of said extrusion tool and faces the outlet of one of said first, second, third and fourth feed channels formed within said body. 49. The spreading head of claim 48, wherein said second cavities face respectively said first feed channels and/or said second feed channels. 50. The spreading head of claim 49, wherein each of said second cavities faces respectively at least one of said first and second feed channels, so as to allow the simultaneous introduction into said second cavity of two distinctive adhesives. 51. The spreading head of claim 50, wherein said second cavities are superimposed and/or laterally adjacent to each other and/or to said first cavities. 52. The spreading head of claim 51, wherein said second cavities are laterally mutually adjacent, each of said second cavities being superimposed on one of said pairs of said first cavities. 53. The spreading head of claim 52, wherein the shape and size of said second cavities follows the shape and size of said first cavities at each of said pairs of first cavities on which they are superimposed. 54. The spreading head of claim 53, wherein one or more recesses are formed on said lower surface of said extrusion tool so that each recess affects a said pair of said first cavities which are mutually superimposed and the adjacent said second cavities, said recesses being suitable to allow the outflow of said adhesives from said extrusion tool. 55. The spreading head of claim 54, wherein said one or more recesses have a constant thickness and are formed along a plane which is approximately perpendicular to a lamination plane.