PARTIAL DYEING OF YARNS IN WOUND FORM

Abstract: The yarn on distaffs is positioned in supports on a rotating system (26) which alternatively puts the distaffs into the printing assembly (36). There the distaffs undergo the injection of the coloured solutions by means of needles (35) and then a squeezing action by means of compression. After printing, the distaffs are successively taken away in synchronism with the system and laid on a chariot (46) which reaches a cylindrical horizontal autoclave (18) where the subsequent operations of vaporization are carried out in vacuum for the dye fixing, of washing to eliminate the colour unfixed residues, and at last for extracting the most part of the water still present in the distaffs with a combined system of vacuum and of compressed air input.

Description: Partial dyeing of yarns in wound form. The invention refers to iφrOveirients and modifications in the poly¬ chromatic printing systems of yarn on distaffs. The machine carries 5 out in -rynchronis and automatically, with continuous cycle, the subsequent polychrαnatic printing operations, the colour fixing, washing and extraction of the most part of water present in the di¬ staffs with yarns of any type of fibres whatever. O At present, in order to carry out all the above operations, separa¬ te machines are required which carry out printing, fixing, Wc-shing and the distaff extraction. The machinery now used for printing distaffs foresees but one injection phase and, consequently, it allows but limited printing results. All that because by means of T5 only the injection, to avoid blank spaces, i.e. not coloured ones, in the inside of the distaffs, solutions in excess must be used. This causes colour leaking from the distaffs with consequent remar kable problαπs of colour percolation. In particular, the easy stor i g and trasport of the distaffs to the subsequent working phase 20 are not possible. Moreover, this causes a medly of the coloured solutions with consequent unprecise and distαntinuσus printing effects. The invention device enables to avoid the present differentiated working <x_npartments by adopting a machine which carries out the cαπplete operating cycle of the polyc-rcrnatic printing with va¬ riable sections of yarn in distaffs, thus obt_aining a general o- perating simplification with consequent saving of costs, time and labour. In addition, it carries out a printing system which does not require the employ of the above solution in excess. The machine synthetically consists of: a) an injection needle as saribly which lays down the colour solutions by poietrating into the distaff inside; b) a squeezing and αanpressing device which equilizes the distribution of the coloured solutions; σ) a colour ccoking device consisting of some stocking containers and of as many dosing ones (a little smaller than the previous ones) for di¬ stributing the coloured solutions to the injecting needles; d) an autoclave foreseen for the different fixing, washing and print ed distaff extracting operations; e) a robotized and centralized system for automatic distaff charging-and discharging. Substantially the operation cycle foresees the positioning of the distaffs on housings 49 fitted in a rotating systen 26 by means of a robot system 44 with arms, which carries out three different operations at the same time: taking up the distaff to print, in position 43, from the accumulation store 48; drawing of the print ed distaff, in position 42, frαn the rotating system of the print ing bench, and the laying down of the distaff separating plate in position 41. By means of a 45* rotation, the robot then carries out other three operations: it lays down the printed distaff on the distaff carrying chariot 46 of autoclave 18; it lays down the distaff to print on the seat fitted on the rotating system now become free after the previous operation; it draws away the plate separating the distaffs from the relevant plate store 45. The rotating systsn. foresees four positions: two working ones in- tercaleted with two other waiting ones. The distaff to print, fitt ed on the rotating system for charging and discharging 28, after the first waiting position 27, is raised by means of a piston 37 as high as the printing bench 24 and it here undergoes an injec- tion action by means of four pneumatic assemblies 36 with needle injectors 35 and subsequently a squeezing and ccmpressiαn action by four pneumatic groups 31 complete with jaws 32. The distaff thus printed is laid down on the housing of the underlying rotat¬ ing systan by means of the same piston 37 which previously had ta- ken it. Fran here, after a clockwise rotation of one place, it stops in the second waiting position 25, before returning into the ch-__g-_ng-discharging position 28, while another distaff to print, ccming fran the first waiting position 27, reaches the printing position and frcm here it is drawn by the same piston 37 and brought up to the height of the printing bench 24, and it under¬ goes the injection and cαnpression squeezing like the previous distaff. The printed distaff after a stop in the second waiting position 25, arrives in the loading-unloading position 28, is then taken away by the robot system 44 and put into the special lodging 47 of the distaff bearing chariot 46. In the now free lodging 28, a new distaff to print is positioned by the same roboti ed system 44 which cones frαn the distaff store 48, and a new print ing phase is thus started. In this way, a distaff after the other is deposited in cαtinuous cycle, printed,, discharged frcm the printing machine and loaded on the chariot 46 of autoclave 18. The said distaff bearing chariot is foreseen for positioning more distaffs which are deposited by the robot system 44; when the load ing of the chariot is completed, this one is put into autoclave 18 to undergo the different operations, namely vaporization, wash i_ng and extraction. This because autoclave 18 is foreseen for carrying out these three operations automatically and in succes¬ sion. As soon the distaff carrying chariot 46 has been introduc- ed into autoclave 18, this one is hermetically closed, and the first operation starts, namely the vapourization for fixing the 90: colouring materials. By means of the pump 22 just foreseen for this purpose, the va¬ cuum is obtained, checked by means of the relevant vaσiumgauge 1; steam is then introduced directly through " the cpening of valve 11 95 " into the autoclave until the pressure has been reestablished and as long as wished. As the vapourization is ended, the operation of the distaff washing starts,- the discharge valve 14 is opened, then closed, and the breathing valve 3 opened. The required water quantity is introduced through valve 8, checking it by means of 100 level probe 6. As the bath recirσalation pump 23 is started, the water begins to be warmed through the heat exchanger 19, then is cooled and rinsed. After having discharged the machine through-- valve 14, the operation is -starte -for extracting the most part of the water still remained on the distaffs. After having start- 1055 ed the pump 22 with no load until--the wished depression has been reached, checking it with the vacuum gauge 1, cctnpressed air is introduced until the disired pressure has been reached by open¬ ing the valve 13 and checking it with gauge 2. The discharging valve 14 is then opened which allows the water exit. If necessa- 110 ry, this extraction operation can be repeated, otherwise the chariot 46 is extracted Srαn the autoclave 18 and the distaffs sent to drying. The autoclave 18 is then ready for receiving another carriage 46 cαnplete with printed distaffs for repeat¬ ing the cycle. 115 The coloured solutions to the injecting needles 35 are fed by a colour kitchen consisting of some cylindrical containers 30 far the coloured solution stocking and through the relevant dividing containers 29 foreseen for establishing in advance the exact - j 20 quantity of solution to inject. This occurs by means of the elec tronic preselectors, level gauges 40 and sensors 38. As soon as in the dividing containers 29 the wished level has been reached, cxmpressed air is let into them dete_-T_Lning a pressure establish ed in advance and checked by means of gauges 39. ϊhis allcws to 25 transfer the whole quantity of solution selected in advance to the injecting needles 35 and from here on the distaff to print 5. The input of the different coloured solutions to the needles 35 13 " can be changed by exchanging, by means of quick connectors, the pipes caning frcm the colour kitchen and containiig coloured sub stances, so as to obtain a variety of ccrobinaticns. _he possibili ty of establishing in advance the exact quantity of liquid on ' the distaff enables to avoid an exceediig quantity of solution on 35- the distaffs alltogether and in cαnbination with the compression squeezing and, therefore, to avoid the i_ncoπveniencies of the colour percolation. A form of execution is illustrated, in a merely indicative way, 140 in the drawings of the tables frαn 1 to 9. Referring to these ones, the autoclave installation can be observed from different positions in the drawings of the tables 1 , 2 and 3. Table 4 is the representation of the distaff bearing chariot. Table 5 is the representation of the printing device and of the colour kitchen. 1 55 Table 6 is the schematic view of the rotating system 46 with the distaff in ist positioning. Table 7 is the representation of the colour kitchen; table 8 points out a particular of the colour kitchen ccncerning the dosing system of the dosing containers; table 9 is the representation of the robotized systan for the 150 distaff loading and unloading. When realizing the components, their form and the materials may be foreseen in different way.

Claims: Claims. 1) Machine for polichrcmatic printing with variable sections of yarn on distaffs, characterized by the fact that the distaff (5) in the printing phase, is at first ccmpressed.by the squeezing system (31) and jaws (32), and subsequently underlaid to injec¬ tion by means of the needle system (35) . During the injection, the jaws (32) are releasing compression, so as to obtain a sponge effect which increases the absorbing pcwer and penetra¬ tion into the distaff. After the injection, a set of massages is performed with the same jaw system (32) with a view to fa¬ vouring the cover of the threads of the whole distaff section. During this phase and in the intervals between one compression and theother, the distaff (5) is turned by means of an actua¬ tor (33) to allcw a uniform squeezing action of the jaws (32). During the penetration rnovement of the needles into the distaff they are sustained by a system of guides (34) which avoids flexions and, consequently, easy breaks particularly in the early phase of the penetration. 2) Machine for poli.chrαnatic printing with variable sections of yarn on distaffs, as to claim 1 , characterized by the fact that the slant of the injection assembly (36) and the one of the • cαπpression group (31) can be adjusted and adapted according to the farm of the distaff (5) to print. / 3) Machine for polichrαnatic printing with wariable sections of yarn on distaffs, as to claim 1, characterized by the fact that it is allowed to obtain more colour combinations by changing the position of the pipes (50) caning from the colour kitchen and cxntaining the coloured solutions up to the height of the injecting needles by means of quick connectors.

Inventors: SCATIZZI MARIO, SCATIZZI, MARIO
Applicants: SCATIZZI MARIO, SCATIZZI, MARIO
Application year: 1986
Main classification: D06B11
IPC codes: D06B11