Tube for dyeing bobbins of yarn

Abstract: One of the ends (X) of the tube has an internal annular ledge (7) and an annular wall (9), the internal surface (9A) of which forms an annular corner (10) around the ledge (7) and widens slightly as it moves away from the ledge; the other end (Y) forms a setback (12) towards the inside followed by an approximately cylindrical collar (14) for the turns of reserve yarn, the annular edge (14A) of which is capable of bearing against said ledge (7) and of being centered by said annular corner (10); said annular edge (14A) has hollows (16) which are capable of allowing the passage of fluid which thus acts on the turns of the reserve.

Description: The invention relates to a tube for dyeing reels, with a cribrous wall, on which is wound the yarn to form a cop or reel; each of the annular ends of the tube - which is essentially cylindrical - is capable of interacting with the opposite end of a similar tube which is adjacent in the arrangement on a guide column of a dyeing or other device. Usually, one of the ends is shaped with an external annular channel for a plurality of turns of reserve yarn. EP-A-0201826 describes a tube for dyeing reels, with an essential cylindrical and cribrous wall, on which is wound the yarn to form a cop or reel, each of the annular ends of the tube being capable of interacting with the opposite end of an adjacent tube in the arrangement on a guide column of a dyeing or other device; one of the ends has an internal annular ledge and an annular wall, the internal surface of which forms an annular corner around said ledge; the other end forms a setback toward the inside followed by a collar, the annular edge of which is capable of bearing against said ledge. The tube of said EP-A-0201.826 provides a reserve of yarn in an annular channel which is placed outside the collar of the upper end of the tube, which is surrounded by the annular wall. The turns of the reserve are scarcely invested by the dyeing liquid, and they might have defects of dyeing. The tube according to the invention is capable of ensuring that even these turns are subjected to regular dyeing. Other aims and advantages will emerge from the text which follows. According to the invention: the annular corner of the annular wall is rounded, and therefore the annular edge where the collar is centered by said annular corner; the internal surface of said annular wall widens slightly as it moves away from the ledge; said collar is approximately cylindrical and said annular edge forms with the support ledge several openings which are capable of allowing passages for fluid which flows between said annular wall and said approximately cylindrical collar. With this disposition, it is possible to dye the turns of reserve yarn, which are wound on said cylindrical collar. The drawing shows a possible embodiment of the invention and in particular: Fig. 1 shows a general view; Figs 2 and 3 show in cross-section two interacting ends, connected and separated respectively, and Fig. 4 shows a diagrammatic plan view. According to what is illustrated in the attached drawing, 1 and 3 indicate two adjacent and like tubes which are assembled axially on one and the same column of a device for dyeing, each tube comprising a reel or cop B1 and B3 respectively which is to be dyed with liquid which passes through the cribrous walls of the tubes and through the mass of the wound material. The two ends of each tube are shaped in order to interact and to receive, one or the other without distinction or both, a reserve of yarn and to ensure, in particular on the upper reduced end of a tube, the action of the dye on the turns of the reserve also. According to what is illustrated in the drawing, one of the ends X, considered lower in the drawing itself, has an internal annular ledge 7 and an annular wall 9, the internal surface 9A of which forms an annular corner 10 around the ledge 7 and widens gradually in relation to the diameter of the corner 10. The other end Y, being the upper end in the drawing, has a setback 12 towards the inside and an essentially cylindrical collar 14 which extends from said setback 12, forming an annular edge 14A, the external corner of which has a diameter which corresponds to that of the corner 10 of the end X of the corresponding tube; the annular edge 14A has hollows 16 distributed essentially in a uniform manner along the edge itself, for the purposes indicated below. The external surface of the collar 14 and, respectively, a channel 9C formed outside the wall 9 can receive a series of turns of reserve yarn indicated respectively by R1 and R2, it being possible to form the reserve turns alternatly or simultaneously on one and on the other of said seats in the formation of the reels or cops such as B1 and B3. When two tubes are connected to one another axially, the collar 14 penetrates into the inside of the wall 9 and its edge 14A is centered by the corner 10 on the ledge 7, against which the edge 14A bears. With the bearing of the edge 14A against the ledge 7, passages are defined between the two tubes, defined by the hollows 16 which can be formed on said edge 14 but alternatively in equivalent manner can also be created by projections formed in said ledge 7 for the bearing df the edge 14A. The hollows 16 are advantageously shallow and extended in the circumferential direction so as to have a substantial distribution of said apertures along the circumference of connection between the two tubes. In the connection between the two tubes, the collar 14 and the internal surface 9A of the wall 9 leave an interspace which develops from the passages formed by the hollows 16 as far as the setback 12, leaving a space between said setback and the wall 9. It is thus possible to ensure a circulation of liquid in the zone comprised between the collar 14 and the wall 9 and therefore in the region of the turns of the reserve yarn R1. The two tubes are centered in relation to one another by the interaction of the edge 14A with the corner 10 of the ledge 7. The cribrous cylindrical wall of the tubes is made in one of the ways already provided in other patents of the same holder also.

Claims: A tube for dyeing reels, with an essentially cylindrical and cribrous wall, on which is wound the yarn to form a cop or reel, each of the annular ends of the tube being capable of interacting with the opposite end of an adjacent tube in the arrangement on a guide column of a dyeing or other device, wherein one of the ends (X) has an internal annular ledge (7) and an annular wall (9), the internal surface (9A) of which forms an annular corner (10) around the ledge (7) and wherein the other end (Y) forms a setback (12) toward the inside followed by a collar (14), the annular edge (14A) of which is capable of bearing against said ledge (7), characterized in that said corner (10) is rounded so that said annular edge (14A) is centered by said annular corner (10), in that the internal surface (9A) of said annular wall widens slightly as it moves away from the ledge, in that said collar (14) is approximately cylindrical and in that said annular edge (14A) forms with the support ledge (7) openings (16) which are capable of allowing passages for fluid which flows between said annular wall (9) and said approximately cylindrical collar (10), as a result of which it is possible to dye the turns of reserve yarn (R1), which are wound on said cylindrical collar (14). The tube for reels as claimed in the preceding claim, wherein said annular wall (9) forms externally an annular channel (9C) capable of receiving turns of reserve yarn (R2). The tube for reels as claimed in claim 2, wherein said annular channel (9C) has transverse projections which are capable of facilitating the taking of the reserve yarn. The tube for reels as claimed in claim 1, wherein the hollows (16) are formed by the annular edge (14) of the cylindrical collar (10) and are formed by depressions defining slots (16) along the annular ledge. The tube for dyeing reels, with end shapes capable of creating in the connection a circulation of liquid in order to act on the turns of the reserve, the whole as described and represented.

Inventors: ROMAGNOLI TIZIANO, ROMAGNOLI, TIZIANO
Applicants: MARIPLAST SPA, MARIPLAST S.P.A.
Application year: 1991
Main classification: D06B23
IPC codes: D06B23