CN113966420A - Machine and method for discontinuous dyeing of yarn spools - Google Patents
Machine and method for discontinuous dyeing of yarn spools Download PDFInfo
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- CN113966420A CN113966420A CN202080042665.2A CN202080042665A CN113966420A CN 113966420 A CN113966420 A CN 113966420A CN 202080042665 A CN202080042665 A CN 202080042665A CN 113966420 A CN113966420 A CN 113966420A
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- bath
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- 238000004043 dyeing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract 4
- 239000012530 fluid Substances 0.000 claims description 32
- 239000000126 substance Substances 0.000 claims description 14
- 230000002441 reversible effect Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 2
- 230000003134 recirculating effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000005470 impregnation Methods 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 9
- 238000005406 washing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B5/00—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating
- D06B5/12—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through materials of definite length
- D06B5/16—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through materials of definite length through yarns, threads or filaments
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
- D06B23/20—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation
- D06B23/205—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation for adding or mixing constituents of the treating material
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
- D06B23/20—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation
- D06B23/22—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation for heating
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
- D06B3/04—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of yarns, threads or filaments
- D06B3/09—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of yarns, threads or filaments as packages, e.g. cheeses
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Textile Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
A machine and a method for discontinuous dyeing of yarn spools require impregnation of the yarn spools (2) to be treated in a treatment bath in a closed tank (1), variation of the amount of bath kept in the yarn spools a certain number of times per minute, and convenient mixing of the remaining amount of free bath in the closed tank (1). The first pump (8) is essentially used to change the bath in the spool and the second pump (20) is used to mix the free bath in the closed tank (1). Furthermore, an external heat exchanger (22) is installed on the circuit of the second pump (20) and is suitable for heating and/or cooling the bath.
Description
Technical Field
The present invention relates to a machine and a process for discontinuous dyeing of yarn spools, wherein the term "yarn spool" refers to any material of yarn or textile fibre, including in the form of a flock or carding or combing band, not necessarily wound around an axis, such as spools, spindles, beams, bobbins, clews, skeins, tops, bobbins.
Background
In the field of machines for discontinuous dyeing of yarn spools, it is known to keep the spool at least partially immersed in a dye vat, the spool being made to circulate unidirectionally, i.e. from the inside to the outside of the yarn, or bidirectionally, i.e. alternately from the outside of the yarn into the yarn, reversing the flow according to a preset time, and vice versa.
Various examples of these machines are described in US 3908409.
In particular, it is known to use closed tanks containing the spool to be dyed and the treatment bath mounted on corresponding rod-like supports.
A spool of a well-defined cylindrical or truncated-cone shape, usually consisting of yarn wound around a cylindrical, conveniently perforated tube, and having a weight typically between 1kg and 3 kg.
The closed tank is connected to a reversing device for reversing the circulation of the bath and to a main centrifugal pump. The heating coil may be positioned inside the closed tank and, depending on the current situation of the reversing device, it is impinged by the flow of the treatment fluid in both directions.
The operating principle of dyeing machines for discontinuous dyeing of spools is based on passing the treatment bath contained in a closed tank through the spool bidirectionally.
In particular, the treatment bath is pushed by the main pump through a suitable hydraulic circuit and is forced radially through the yarn wound on the perforated pipe.
Depending on the conditions of the reversing device, the bath may be forced to pass from the outside to the inside of the yarn and vice versa.
The main pump needs to provide a sufficient flow rate to circulate all the bath contained in the closed tank through the spool in both directions allowed by the reversing device.
The head of the pump must therefore be sufficient to overcome the flow resistance created by the tube and by the wound yarn.
Generally, it is good practice to circulate the full amount of bath contained in a closed tank through the spool three times in one minute. This is to ensure uniformity of the dye vat temperature and the same color depth on all surfaces of the yarn.
Thus, all such amounts of bath need to be passed through a catheter (of appropriate size), through a spool, through a coil, and through a bath reversal device.
The flow resistance condition created by the spool is a function of:
type of yarn (polyester, cotton, nylon, etc.),
the winding density of the yarn on the tube (greater density results in greater flow resistance),
the fact that the yarn is able to shrink due to the treatment to which it is subjected (typical behaviour of polyester), increasing the resistance to the passage of the bath during the process.
Usually, a maximum allowable pressure difference (for example 1.5 bar) is imposed on the main centrifugal pump in order to prevent the yarn from being damaged by the forces generated when the bath passes through the spool 5. Therefore, if the pressure difference tends to exceed the maximum allowable value, the inverter of the pump reduces the number of revolutions in order to reduce the flow rate and prevent the maximum allowable pressure difference from being exceeded. For this reason, the flow rate values of the pumps are generally lower than expected, and therefore the throughput of heat exchange and the ability to homogenize the bath contained in the closed tank, i.e. the results of the process, are not reached.
Therefore, the above-mentioned conventional solutions have the following drawbacks:
a reduction in the heat exchange efficiency (heat exchange coefficient as a function of flow rate);
-reduction of the conditions of capacity to homogenize the bath inside the dyeing enclosure;
-a reduction in the ability to homogenize the temperature inside the closed tank;
uneven distribution of chemical products and dyes, in particular in different concentrations in the closed tank, thus also giving different dyeing to different spools and also to the thickness of the yarn;
an unstable state of delivery of the bath to the tank of chemical product, in particular a condition of introduction of the product and of the dye into the circuit of the main pump, which can vary according to the operating conditions of the main pump;
high power of the main pump.
Disclosure of Invention
It is an object of the present invention to provide a dyeing machine for dyeing yarn spools and a corresponding dyeing method, which are capable of improving the known art in one or more of the above-mentioned aspects.
Within this aim, an object of the invention is to improve the distribution in a closed tank of the dyes and/or chemical products used to treat the yarn.
Another object of the invention is to make the temperature uniform and increase the efficiency of the heat exchange inside the closed tank.
Another object is to reduce the electric power consumed by the main pump in the process.
Another object of the invention is to enable the machine to make the bath homogeneous, independently of the pressure differences generated on the yarn spools.
Another object of the present invention is to reduce the size of the hydraulic circuit of the main pump.
Furthermore, another object of the present invention is to overcome the drawbacks of the known art in an alternative way to any existing solution.
Another object of the present invention is to provide a dyeing machine for dyeing yarn spools and a corresponding dyeing method which are highly reliable, easy to implement and low in cost.
This aim and these and other objects, which will become better apparent hereinafter, are achieved by a machine according to claim 1, optionally provided with one or more of the features of the dependent claims.
The object and the aims of the invention are also achieved by a method according to claim 10.
The amount of bath liquid held in the yarn spools changes substantially a certain number of times per minute in a closed tank containing the yarn spools to be treated immersed in the treatment bath, and the remaining amount of free bath liquid is conveniently mixed in the closed tank. The first pump is then used to change the bath in the spool and the second pump is used to mix the free bath in the closed tank. Furthermore, an external heat exchanger is mounted on the circuit of the second pump and is adapted to heat and/or cool the bath.
Drawings
Further characteristics and advantages of the invention will become better apparent from the description of a preferred, but not exclusive, embodiment of the machine according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
figure 1 schematically shows a dyeing machine for dyeing yarn spools according to the prior art;
FIG. 2 illustrates the machine of FIG. 1 in a reverse flow condition;
figure 3 schematically shows a dyeing machine for dyeing yarn spools according to the present invention;
fig. 4 shows the machine of fig. 3 in a reverse flow condition.
Detailed Description
With reference to the figures, a traditional dyeing machine for dyeing yarn spools comprises a vertically extending closed tank 101 containing the spool to be dyed 102 and the treatment bath 103 mounted on respective rod-like supports 105.
In the figure, a single spool 102 is shown, but typically a plurality of rod-like supports 105 are arranged in the closed tank 101, on each of which a plurality of yarn spools 102 are mounted one above the other.
The rod-like support 105 is mounted on a base plate 106 which distributes or receives from the support 105 a treatment fluid which is circulated by a main pump 108 via a circuit 109 and a reversing device 107 for reversing the circulation in order to perform a bidirectional change of treatment bath.
The heating coil 104 may be positioned inside the closed tank and impinged by the flow of treatment fluid in both directions depending on the conditions in which the reversing device is currently located.
The treatment bath is pushed by the main pump 108 through the circuit 109, the base plate 106 and the rod-like support 105, and is forced to pass radially through the yarn from the outside towards the inside of the spool 102 (in the first configuration of the reverser 107, as shown in figure 1) and from the inside towards the outside of the spool 102 (in the second configuration of the reverser 107, as shown in figure 2).
If the amount of bath contained in the closed tank 101 is 3800 liters, the flow rate required by the main pump 108 is 11400l/min, that is 684m3H, so that the bath 103 can be changed three times per minute. Typically, at the operating point, the hydraulic head required to overcome the flow resistance along the circuit with this amount of bath is 15mcw (meters water column). Thus, the required characteristics for the main pump are 684m at 15mcw3/h。
Fig. 3 and 4 show a dyeing machine 100 for discontinuous dyeing according to an embodiment of the present invention.
The machine 100 comprises a closed tank 1, which is adapted to be at least partially filled with a treatment fluid so as to form a treatment bath 3 inside the closed tank 1. The treatment bath is formed from a treatment fluid which may consist of water or a mixture of water mixed with dyes and/or auxiliary chemicals for washing, soaping, scouring and/or bleaching.
The closed tank 1, which is generally cylindrical and closed at the ends, may extend vertically as in the case shown, i.e. with the central axis of the cylinder substantially perpendicular to the ground on which the closed tank 1 rests.
In an alternative embodiment, not shown, the closed tank may alternatively extend horizontally, i.e. with the central axis of its cylindrical body substantially parallel to the ground on which the closed tank rests.
The closed tank 1 internally comprises at least one vertically extending spool support rod 5 of known type and preferably consisting of a linear manifold mounted at its bottom on a distribution chamber 6 inside the closed tank 1, with which the rod 5 is in fluid communication.
At least one yarn spool 2, preferably a stack of yarn spools 2, is mounted on each spool support rod 5, and the rod 5 is mounted within the closed tank 1 together with a dispensing chamber 6 to keep the spool 2 at least partially immersed in the treatment bath 3 during use.
In the invention described in this application, the term "yarn bobbin" 2 denotes any material of yarn or textile fibres (including in the form of short pile or of a carding or combing band) wound around or not around an axis, such as bobbins, spindles, warp beams, bobbins, clews, skeins, tops, bobbins.
Each spool support rod 5 enables treatment fluid to pass laterally through the spool mounted thereon. In particular, the spool support rod 5 is in fact a straight tube perforated substantially over its entire lateral surface so as to radially guide the flow of treatment fluid axially through it.
On the other hand, the distribution chamber 6 may be a substantially cylindrical body with a hollow interior, the axis of which is parallel to the axis of the spool support bar 5, and on the surface of which openings are provided for connection to the respective spool support bar 5, and below which a single opening is provided for the passage of the treatment fluid.
In a preferred embodiment of the invention, the closed tank 1 comprises a plurality of bobbin support rods 5 mounted inside the closed tank 1, vertically parallel to each other on the same distribution chamber 6, or in groups on separate and laterally adjacent distribution chambers 6, also contained inside the closed tank 1. A plurality of yarn spools 2 are fitted to each of these spool support rods 5 and are thus stacked on top of each other along the respective rod 5.
The machine 100 also comprises recirculation means hydraulically connected to the closed tank 1 for moving the treatment fluid between the inside and the outside of the closed tank 1.
In particular, the machine 100 circulates the entire treatment bath 3 contained in the closed tank 1 through the spool 2 at least three times per minute, taking into account the two requirements.
The first requirement is to change the bath contained inside the yarn spool 2. In fact, any treatment desired to be carried out on the yarn must be carried out by continuously feeding the treatment fluid (i.e. water and dye and/or water and chemical product). In essence, this operation of modifying the bath contained in the yarn makes it possible to bring chemical products and/or dyes inside the yarn, enabling the yarn to be converted (resulting from operations such as scouring, bleaching, colouring, soaping, washing). This transformation is usually a chemical/physical process that takes place in successive steps, such as whitening with hydrogen peroxide and/or soda, washing, colouring with suitable dyes according to the composition of the fibre, passing from an acidic fluid to an alkaline fluid or vice versa, in order to allow a chemical reaction to take place, etc. All of these transitions may be achieved by varying the bath present in the yarn.
The second requirement is to vary the entire bath at least three times per minute in order to homogenize or homogenize the bath 3 contained in the closed tank 1. In order for the transition to take place, adding chemicals and/or dyes in each change, or changing the temperature conditions inside the closed tank 1, causes transients that locally change the conditions in the part of the bath, which therefore, in order to prevent the variations in conditions from occurring, would produce different shades of color in the layers of the wound yarn and/or between different spools in the same batch, such transients thus requiring a uniform rendering.
In the present invention, the two operations of changing and homogenizing the treatment bath 3 are distributed to two different pumps.
In particular, considering that the portion of the treatment bath 3 retained by absorption by the yarn spool 2 contained in the bath is known beforehand and therefore the remaining second portion of the treatment bath 3 is also known, it is possible to use a first pump 8 adapted to vary only the bath and having a flow rate such as to vary only the aforesaid first portion of the treatment bath 3 contained in the yarn a preset number of times per unit of time, for example at least three times per minute.
A first pump 8, for example of the centrifugal type, is associated with a first hydraulic circuit 9, which optionally comprises the fluid-reversing device 7 and which passes through the spindle support rod 5 and, if present, the distribution chamber 6.
In the changing operation performed by the first pump 8, the flow direction may be reversed at least once by means of a conventional fluid reversing device 7. The fluid reversing devices 7 may comprise flow diverters actuated by controlled actuators (as in the case shown in the figures), or they may be incorporated in the first pump, in which case they are reversible pumps.
The flow rate of the first pump is preferably between 1 and 3 times the total weight of the yarn multiplied by a preset number of times per unit time to vary the first part of the treatment bath 3. This factor comprised between 1 and 3 takes into account not only the treatment fluid remaining in the spools 2, but also the flow losses due to leakage or weepage between the cores of the spools (tubes) stacked on top of each other, as well as the fluid in the first hydraulic circuit 9 associated with the first pump 8, thus including the clearance between the spools 2.
For example, if the total amount of treatment bath 3 contained in the closed tank 1 is 3800 litres, as in the above-mentioned example of the prior art, and if the total load of the spool 2 is 600kg, it is possible to estimate the amount of bath 3 taken up by the spool and the amount circulated in the circuit of the main or first pump is 2.85 × 600 kg-1710 litres, which means that the first part of the treatment bath 3 is about 45% of the total bath 3, while the second part of the treatment bath 3 is about the remaining 55%.
In order to pass 1710 liters of bath liquid through the spool 2 times per minute, the flow rate of the first pump 8 must be 5130 liters/minute, i.e. about 310m3A flow rate of less than half of the main pump 108 of the prior art example.
For mixing the second part of the treatment bath 3 there is a second pump 20 associated with a second hydraulic circuit 21 passing from the outside of the closed tank 1.
The flow rate of the second pump 20, for example, causes a second portion of the treatment bath 3 to exit from the closed tank 1 and return into the closed tank, so as to mix the second portion of the treatment bath, i.e. the portion not retained by the spool 2 and by the first hydraulic circuit 8. Returning to the previous example, in order to mix the remaining 2090 liters of treatment bath 3, the flow rate of the second pump 20 is about 120m3/h。
In this way, the part of the bath not moved by the first pump 8 is mixed, thus rendering the bath outside the spool 2 contained in the closed tank 1 more efficiently and constantly uniform.
The inlet of the second pump 20 is hydraulically connected to the bottom of the closed tank 1 in order to withdraw the treatment bath located below the area of the spool 2, while the outlet of the second pump 20 is hydraulically connected to a heat exchanger 22 external to the closed tank 1, which is adapted to heat or cool the treatment bath on the basis of a predetermined program for treating the yarn, which is programmed in the control system of the machine 100.
Inside the closed tank 1, in particular in the bottom region below the spool support bar 5 and the distribution chamber 6, there is a diffuser 4 hydraulically connected downstream of the heat exchanger 22 along the second hydraulic circuit 21 and preferably constituted by a substantially annular manifold (i.e. a tubular conduit provided with a plurality of through holes on its lateral surface and substantially circular if the closed tank 1 has a vertical axis or quadrangular if the closed tank has a horizontal axis). The diffuser 4 is positioned on the bottom of the closed tank 1 and is adapted so that it blocks the flow of the first portion of the treatment fluid in both possible flow directions imposed by the fluid reversing device 7. In this way, the first part of the treatment bath is subjected to heat exchange after contact with the diffuser 4, in particular if the heat exchanger 22 is used to heat the second part of the treatment bath passing through the second hydraulic circuit 21.
The annular manifold constituting the diffuser 4 preferably occupies a space in a horizontal direction substantially corresponding to the horizontal extension of the base of the gap left between the outermost bobbin 2 and the vertical inner side surface of the closed tank 1, thus allowing the flow of the first portion of bath liquid entering or exiting radially with respect to the bobbin and passing through this gap to continue to impact the diffuser 4.
Finally, the machine 100 may comprise at least one dye tank 120 and/or at least one auxiliary chemical tank 121, for example a product for washing, scouring or bleaching the yarn. In the example shown, tanks 120 and 121 introduce their contents near the inlet of the first pump 8.
In an alternative embodiment, not shown, tank 120 and tank 121 introduce their contents to the vicinity of the inlet of the second pump 20, or directly into the closed tank 1.
There may also be a tank for preparing the bath 3, which can be used during the successive washing steps of the yarn. Such a canister may coincide with one of canister 120 and canister 121, as in the embodiment shown in the figures.
The operation of the present invention will be apparent from the description of the machine 100.
In any case, it is first necessary to insert the yarn spool 2 into the closed tank 1, in particular to fit it onto the spool support bar 5 mounted on the distribution chamber 6, and to insert the assembly into the closed tank 1. In the case shown, the assembly constituted by the dispensing chamber 6, the rod 5 and the spool 2 is inserted from above, i.e. by removing the circular upper cover closing the can 1 and lowering the structure with the spool 2 from above.
The closed tank 1 is then at least partially filled with the treatment fluid used in the first step of the cycle envisaged for the particular yarn used. This filling is such that all bobbins 2 are at least partially immersed in the treatment bath 3.
In this regard, during the first step of the cycle described above, the control system of the machine 100 repeats at least three movement steps (fig. 3) and reverse steps (fig. 4) per minute.
In the moving step, pumping is performed with the first pump 8 to move a first portion of the treatment bath 3 along the first hydraulic circuit 9, which is substantially equal to the known portion of bath 3 known to be retained on the spool 2 by the particular yarn to be treated, optionally increased by a factor between 1 and 3, depending on the configuration of the first circuit 9. In the case shown in fig. 3, in this first step, after moving back upwards along the gap between the spool 2 and the inner side surface of the closed tank and after having passed radially through the spool 2 from the outside towards the respective stem 5, a volume of treatment fluid is sucked in by the dispensing chamber 6 and therefore by the spool support stem 5 under the action of the first pump 8. The flow thus enters the reversing device 7 to then be re-fed to the closed tank by the first pump 8 from its bottom end towards the diffuser 4, again moving back upwards in the above-mentioned gap, due to the temperature of the flow changing in contact with the diffuser 4 and due to mixing with the flow leaving the diffuser 4.
In the step of reversing the flow of the first portion of the treatment fluid, the reversing device 7 (fig. 4) is switched so as to reverse the flow of the first portion of the treatment fluid inside the closed tank with respect to the previous step (fig. 3), while the operation of the first pump 8 remains unchanged with respect to the previous step. Under the action of the first pump 8, a volume of treatment fluid enters from the bottom end of the closed tank 1, rises in the distribution chamber 6 along the spool support bar 5, passes radially through the spool 2 to the outside thereof, descends along the gap between the inner side surface of the closed tank 1 and the spool 2, flows through the diffuser 4 and enters the reverser 7 in order to then be resupplied to the distribution chamber 6.
During the repetition of the two steps of movement and reversal, the remaining second portion of the treatment bath 3 is recirculated through the second pump 20 along the second hydraulic circuit 21.
The passage through the heat exchanger 22 requires thermal conditioning of the fluid volume of the second circuit 21, for example heating it, so that the flow leaving the diffuser 4 changes the temperature of the flow passing around the gap between the spool 2 and the inner side surface of the closed tank 1.
Once the steps of the first fluid process are completed, the control system of the machine 100 may perform other steps, such as introducing dye or chemical products from the tank 120 or the tank 121 or draining the process bath.
Returning to the numerical example of 3800 litres of treatment bath and a total weight of the bobbin 2 of 600kg, it has been seen that the flow rate of the first pump 8 may be about 310m3The flow rate of the second pump 20 may be about 120m3/h。
Assuming a hydraulic head of 15mcw for the first pump 8 and 9-10mcw for the second pump 20, we obtain a power of 22kW for the first pump 8 and 5.5kW for the second pump 12, with a total power of 27.5kW, relative to 45kW for the prior art main pump 108 (flow rate of 684 m)3H, head pressure 15 mcw).
Thus, the power savings that can be achieved by the present invention are significant (38.88% in certain cases).
In addition to saving power consumed during this process, it can be seen that the invention achieves the intended aim and objects.
The flow rate through the spool is made less than half of the flow rate that the prior art machines are required to pass. This makes it possible to make more precision in the process, in addition to being able to work at lower pressure differentials. Passing a larger amount of bath through the same spool necessarily means applying a greater pressure differential and therefore greater physical stress on the yarn.
Therefore, all the hydraulic circuits of the first pump 8 are smaller in size than the hydraulic circuit of the main pump 108 of the related art. Thus, the size of the flow splitter 7 is smaller, the diameter of the tubes is smaller, the diameter of the heat exchanger 22 is smaller, and the amount of unwanted bath in the tubes is smaller.
The heat exchanger of the invention operates with constant heat exchange efficiency, in particular not as a function of the pressure difference of the first pump 8.
The mixing of the treatment bath always takes place in the same way and is not influenced by the pressure difference generated on the spool. Thus, the overall system also has better uniformity.
In the same way, for transferring the bath of the closed tank to the dye tank or auxiliary chemical tank and for introducing the chemical or dye from the dye tank or auxiliary chemical tank into the closed tank, these steps are provided under conditions of stepwise constant operation between different batches.
The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims. Moreover, all the details may be replaced with other technically equivalent elements.
In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to requirements and to the state of the art.
The disclosures in italian patent application 102019000009276, from which this application claims priority, are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.
Claims (13)
1. A dyeing machine (100) for dyeing yarn spools (2), comprising: a closed tank (1) suitable for being at least partially filled with a treatment fluid so as to form a treatment bath (3); and recirculation means (8, 20) connected to said closed tank (1) to move said treatment fluid between the inside and the outside of said closed tank (1),
the closed tank (1) comprises at least one spool support rod (5) on which at least one yarn spool (2) can be mounted such that a first part of the treatment bath (3) is held by being absorbed by the yarn of the at least one yarn spool (2) and a remaining second part of the treatment bath is held outside the at least one yarn spool (2),
the spool support bar (5) is adapted to allow at least the first portion of the treatment bath to pass transversely through the at least one yarn spool (2),
characterized in that said recirculation means comprise:
-a first pump (8) associated with a first hydraulic circuit (9) through said at least one spool support rod (5), said first pump (8) having a flow rate such as to change said first portion of the treatment bath contained in the yarn a preset number of times per unit of time,
-a second pump (20) associated with a second hydraulic circuit (21) passing outside the closed tank (1) and having a flow rate such as to cause the exit of the second portion of the treatment bath from the closed tank (1) and the return of the second portion into the closed tank (1) in order to mix the treatment bath (3).
2. The machine according to claim 1, wherein the flow rate of the first pump (8) is comprised between 1 and 3 times the total weight of the yarn of the at least one yarn spool (2) multiplied by the preset number of times per unit time.
3. Dyeing machine according to claim 1 or 2, characterized in that said second hydraulic circuit (21) comprises a heat exchanger (22) external to said closed tank (1) and adapted to heat or cool said treatment bath (3) based on a predetermined program for treating the yarn that can be executed by the dyeing machine (100).
4. The machine according to one or more of the preceding claims, wherein said second hydraulic circuit (21) comprises a diffuser (4) arranged inside said closed tank (1).
5. The machine according to claims 3 and 4, wherein the diffuser (4) is a substantially toroidal manifold, connected downstream of the heat exchanger (22) and arranged below the at least one spool support bar (5) and in the bottom area of the closed tank (1), so that it is impinged by the flow of the first portion of the treatment bath.
6. The machine according to one or more of the preceding claims, wherein said spool support rod (5) is constituted by a linear manifold and is associated at its bottom end with a distribution chamber (6) hydraulically connected to said first pump (8) and/or to said fluid reversing device (7).
7. Machine according to claim 5 or 6, characterized in that said at least one spool support rod (5) is arranged inside said closed tank so as to leave a gap between said at least one yarn spool (2) and the inner side surface of said closed tank (1), said substantially annular manifold (4) preferably having a horizontal footprint substantially corresponding to the horizontal extension of said gap.
8. Machine according to one or more of claims 3 to 7, wherein said second pump (20) is connected along said second hydraulic circuit (21) upstream of said heat exchanger, at least one tank of dye or auxiliary chemical product (120, 121) being in fluid communication with said closed tank (1).
9. The machine according to one or more of the preceding claims, characterized in that said first hydraulic circuit comprises fluid reversal means (7) adapted to reverse the direction of flow of said first portion of said treatment bath inside said closed tank (1) at least once.
10. A method for discontinuously dyeing a spool of yarn in a dyeing machine, the method comprising the steps of:
-inserting at least one yarn spool (2) into the closed tank (1);
-at least partially filling the closed tank (1) with a treatment fluid to form a treatment bath (3), wherein the at least one yarn spool (2) remains at least partially immersed in the treatment bath;
characterized in that the method comprises a pumping step: -pumping along a first hydraulic circuit (9) a first portion of said treatment bath (3) substantially equal to the portion absorbed by the yarn of said at least one yarn spool (2) at preset times per unit time, preferably at least three times per minute;
and in that the method comprises a recycling step: during the pumping, the remaining second portion of the treatment bath (3) is recirculated along a second hydraulic circuit.
11. The method of claim 10, wherein the recirculating step comprises a heating or cooling step: heating or cooling the second part of the treatment bath (3) outside the closed tank (1).
12. The method of claim 11, wherein the recycling step comprises a diffusing step: -diffusing the second part of the treatment bath in the gap between the at least one yarn spool (2) and the inner surface of the closed tank (1), the second part being thermally regulated as a result of the heating or cooling step, the gap also passing the first part of the treatment bath.
13. Method according to one or more of claims 10 to 12, characterized in that it comprises, during said pumping step, a reversal step: reversing a flow of the first portion of the treatment bath along the first hydraulic circuit at least once.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102019000009276 | 2019-06-18 | ||
| IT102019000009276A IT201900009276A1 (en) | 2019-06-18 | 2019-06-18 | Machine and process for discontinuous dyeing of yarn bobbins. |
| PCT/EP2020/064753 WO2020254082A1 (en) | 2019-06-18 | 2020-05-27 | Machine and method for the discontinuous dyeing of spools of yarn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113966420A true CN113966420A (en) | 2022-01-21 |
Family
ID=68234184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080042665.2A Pending CN113966420A (en) | 2019-06-18 | 2020-05-27 | Machine and method for discontinuous dyeing of yarn spools |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3987103A1 (en) |
| CN (1) | CN113966420A (en) |
| IT (1) | IT201900009276A1 (en) |
| WO (1) | WO2020254082A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055408A (en) * | 2022-05-25 | 2022-09-16 | 富德赛科技(武汉)有限公司 | Cleaning device is used in bergamot chinese yam production and processing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2416797A1 (en) * | 1974-04-06 | 1975-10-16 | Obermaier & Cie | Controlling temp of web dyeing liquor - in heat exchanger provided with small bore recirculation piping and recirculation pump |
| JP2005097670A (en) * | 2003-09-24 | 2005-04-14 | Nagoya Plating Co Ltd | Electroless plating method for fiber, fiber bundle, yarn and the like, and apparatus therefor |
| CN1769567A (en) * | 2004-11-05 | 2006-05-10 | 洛里斯贝利尼股份公司 | Dyeing machine capable of improving bath liquid distribution status and circulation |
| CN101117759A (en) * | 2006-08-03 | 2008-02-06 | 佩吉有限公司 | Machine for the discontinuous dyeing of fabric products |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2577727A (en) * | 1949-04-16 | 1951-12-11 | Abbott Worsted Mills Inc | Pressure dyeing apparatus for textile packages |
| DK128988B (en) | 1971-11-17 | 1974-08-05 | H Nielsen | Apparatus for liquid treatment of textile materials. |
-
2019
- 2019-06-18 IT IT102019000009276A patent/IT201900009276A1/en unknown
-
2020
- 2020-05-27 EP EP20727663.5A patent/EP3987103A1/en active Pending
- 2020-05-27 WO PCT/EP2020/064753 patent/WO2020254082A1/en unknown
- 2020-05-27 CN CN202080042665.2A patent/CN113966420A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2416797A1 (en) * | 1974-04-06 | 1975-10-16 | Obermaier & Cie | Controlling temp of web dyeing liquor - in heat exchanger provided with small bore recirculation piping and recirculation pump |
| JP2005097670A (en) * | 2003-09-24 | 2005-04-14 | Nagoya Plating Co Ltd | Electroless plating method for fiber, fiber bundle, yarn and the like, and apparatus therefor |
| CN1769567A (en) * | 2004-11-05 | 2006-05-10 | 洛里斯贝利尼股份公司 | Dyeing machine capable of improving bath liquid distribution status and circulation |
| CN101117759A (en) * | 2006-08-03 | 2008-02-06 | 佩吉有限公司 | Machine for the discontinuous dyeing of fabric products |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020254082A1 (en) | 2020-12-24 |
| IT201900009276A1 (en) | 2020-12-18 |
| EP3987103A1 (en) | 2022-04-27 |
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