EP1422332A2 - Laboratory padding machine and method for determining the result of dyeing a fabric in a dye bath - Google Patents

Abstract

A fabric test sample (B) is fed from an unwinding station (9) through a dye bath (33) and squeeze rollers (26, 27) to a wind-up (10). Injectors (34, 35) top up the bath with dye liquor during the dyeing process according to the volume of dye liquor in the bath (33) as determined by sensors, e.g. by a liquid column. The injectors are actuated by pneumatic pistons and the fabric tension and squeeze roller pressure is adjustable. An Independent claim is also included for the process of dye uptake testing in which the sample is fed continuously through the bath while keeping the liquor volume in the bath constant. The sample is then wound up and the shade compared with the desired color. The processing conditions are set to simulate those encountered on the production machine. The sample is sufficiently long to take up at least one and a half times the bath volume and it has non-absorbent end strips, e.g. of polymer film. After winding up, the sample is sealed from atmospheric influences while any reactions take place.

Description

The invention relates to a laboratory foulard and a method for determining the Color loss of a web dyed using a dyeing liquor.

The invention has its problems in the continuous staining of textile webs taken on a foulard. This particularly occurs Native and reaction dyes the effect that the solution and Transport medium water and different color pigments relative to each other absorbed more slowly or faster by the continuous web become. This leads to changes in the concentration of the dye liquor in the padding volume. For example, if the web absorbs water faster, the dyeing liquor becomes impoverished of water and the concentration of dye becomes higher. This means that the Color depth increases, i.e. the beginning of the web is colored much lighter than the end of the dye section in question. The color tone also changes over the Length of the dyeing section if the dyes differ in speed from the continuous web of material are included until in the padding volume has reached a state of equilibrium.

A typical example of this phenomenon is dyeing viscose with Reactive dyes: Viscose swells very strongly at the beginning and prefers to take Water from the dye liquor.

But there is also the reverse case, that a certain textile web preferably absorbs dye from the dye liquor. The beginning of the Coloring section colored darker.

When dyeing with reactive dyes is another cause for the length of the Material web uneven color loss in the inclination of the reactive dye seen for hydrolysis. Hydrolysed reactive dye represents the actual one Dyeing process is no longer available and can therefore Changes in the concentration of reactive reactive dyes.

The resulting longitudinal color sequences are also known as "tailing". she usually run after a positive or negative e-function and end in a state of equilibrium, after which no process takes place.

Even if the causes of tailing are largely known today, it is Problem still exists and must be the initial lengths of many dyeing lots because of the color changes still sold as a second choice or completely be discarded.

Great efforts have therefore been made in the past to Find measures that reduce the effect of tailing. Such measures consist, for example, of dyes of the same affinity and / or To use hydrolysis constant, the temperature in coloring brews constant too hold or to minimize the liquor volume in the dyeing trough. In particular Due to the last measure, the lengths of the tailing effect to reduce negatively influenced web sections.

However, a significant problem remains that the final color loss the web cannot be predicted with certainty. This is especially then of considerable importance if high quality textile products - for example clothes - from sections of different webs can be produced, since even slight color differences from the Garment conveyed a visual disturbance. Furthermore, this problem is relevant when webs of a certain color have to be made.

To make sure that the colored web finally the desired one Color, it is necessary to test it in the production pool Color web sections of a length that ensures that in the Foulard volume has already reached an equilibrium state and therefore not Longitudinal flow takes place more. Then the colored web section in a dwelling station can be stored for a duration that is at least almost ensures complete reaction of the dye with the web. Staying here for 24 hours is not uncommon. Should the web it does not show the desired color after the longitudinal run required to repeat the procedure. The one to approximate the one you want Process parameters to be changed are essentially based on Experience of the operators of the foulards, so that an unpredictable Number of test stains to be carried out with the production foulard, until the desired color drop is finally achieved.

It is therefore disadvantageous that on the one hand the test stains with a considerable amount Committee on product line sections, on the other hand by the necessary dwell times of the web sections until the determination of the Color downtimes can cause significant downtimes.

It is therefore the object of the invention to provide an apparatus and a method create by which the amount of web sections that are for the Trial staining is required, as well as the downtime of the production foulard be reduced.

This object is achieved by the laboratory foulard and solved by the method set out in claim 16.

The laboratory foulard comprises a padding volume for the dyeing liquor, an unwinding station and a take-up station for the webs and means for guiding the Material web through the padding volume of the dyeing liquor. It is characterized in that a Nachdosiereinrichtung is provided, by means of which dye liquor during the Passing the web through the padding volume is refillable, such that the Amount of dye liquor in the padding volume at least substantially constant is. Through this measure, the conditions that are in the dyeing liquor set in the production pool during production, largely achieved. In particular, this measure ensures that already after Passing through a relatively short section of a narrow one, for laboratory testing used fabric in the padding volume a state of equilibrium sets, i.e. the tailing effect no longer occurs. So on the laboratory foulard those needed to achieve the desired color dropout Fleet compositions can be determined. Trial staining on the Production foulard for determining the dyeing recipe is not necessary.

A horizontal 2-roll laboratory foulard is known from the company Mathis However, this is a simulation of the conditions prevailing during production not suitable.

The padding volume is preferred in the laboratory padding according to the invention formed by a gusset of a 2-roll squeeze unit. However, it is conceivable furthermore, to provide a trough to form the padding volume through which the material web is carried out before it passes through a crushing machine. The trough can be arranged below the crushing mechanism. The web is the Then crushing machine fed from bottom to top.

The postdosing device preferably comprises one of the type Injection syringe-working piston-cylinder unit. To operate the same can a pneumatically acting actuator can be provided which on the Piston of the piston-cylinder unit acts.

In order to optimally stabilize the state of equilibrium in the padding volume, a control device is preferably provided which has a signal for actuation generated the actuator, the size of the level of the Foulard volume depends. This measure ensures that regardless of the train speed and its portability for the Dyeing liquor the specified level in the pad volume as much as possible is kept constant without the need for operating personnel. The laboratory dyeing process can therefore take place automatically.

The control device can comprise a sensor which is designed such that it the pressure prevailing in the padding volume through the liquid column. This design has an optoelectronic design that is also conceivable acting sensor the advantage that it is independent of the degree of The dyeing liquor works and is insensitive to dirt.

To reproduce the conditions in the production pool as much as possible can, is the diameter of the rollers of the 2-roller crushing machine Laboratory foulards are preferably identical to the diameter of the corresponding one Rolling the production foulard selected. It is particularly preferred if the Rolls of the 2-roll crusher have a roll coating that corresponds to that of the corresponding rollers of the production pad.

In the laboratory foulard are the unwinding station, especially the one Winding station designed so that the web tension on the part of Entry into the padding volume and web tension on the side of the outlet are adjustable from the padding volume. For this is the one with the unwind station caused unwinding resistance as well as that generated with the winding station Web train adjustable.

Furthermore, the 2-roller squeeze mechanism is designed such that the line force in the Machining gap is adjustable, to a value that is also in the roll gap of the production foulard prevails.

An embodiment of the invention is particularly preferred Laboratory foulards in which the rollers of the 2-roller squeeze mechanism are supported on one side are. This measure makes "the core" of the laboratory foulard easy from the outside accessible, which considerably simplifies its maintenance and cleaning. Also can check the function of the laboratory foulard optically based on this measure become.

The usability and maintenance of the laboratory foulard according to the invention is further simplified if all of the rollers that move during the operation of the Laboratory foulards are in contact with the web, are stored on one side.

The assembly of an unwinding core containing the web sample to be colored and the winding core provided for winding up the material web is considerable simplified if the unwinding and rewinding stations include tensioning cores, whose diameter for the purpose of non-positive reception of the winding tubes can be enlarged.

• kontinuierliches Durchführung eines Streifens einer Warenbahn durch ein Volumen, das eine vorbestimmte Menge an Färbeflotte enthält;
• Zufuhr an durch die Warenbahn entnommener Färbeflotte derart, daß die Färbeflottenmenge im Volumen zumindest annähernd konstant ist;
• Entnehmen der durch das Volumen durchgeführten Warenbahn und Übergabe derselben an eine Verweilstation;
• Vergleich des Farbausfalls nach Entnahme der Warenbahn aus der Verweilstation mit einem gewünschten Farbton.

The method according to the invention for determining the color loss of a web dyed by means of a dyeing liquor is characterized by the following steps:

• continuously carrying out a strip of a web through a volume containing a predetermined amount of dye liquor;
• Supply of dye liquor removed by the web in such a way that the quantity of dye liquor is at least approximately constant in volume;
• Removing the web of material carried through the volume and transferring it to a dwell station;
• Comparison of the color loss after removing the web from the dwell station with a desired color.

This procedure is changed by changing the composition of the dye liquor Repeated until the desired color drop has occurred. The one at the Laboratory foulard ultimately necessary process parameters as well as the The composition of the dyeing liquor is then used in the production foulard realized.

Experiments have shown that the equilibrium color drop has occurred with in other words, no more tailing occurs when the foulard volume guided section of the web has at least a length that at least 1.5 times the padding volume of dye liquor taken up by the web becomes.

The implementation of the process is considerably simplified if - how special preferred - at the beginning of the strip of the web, a lead from one non-absorbent material - preferably made of a polymer film - is attached.

This measure has the effect that no dye liquor of the usually made of cardboard existing winding tube is sucked up from the web and thus the Color loss changed. It also prevents atmospheric oxygen from reaching the moist one Goods train arrives.

Fig. 1 - schematisch - den Laborfoulard in einer Ansicht der der Bedienperson zugewandten Seite;

Fig. 2 - schematisch - eine Ansicht desselben Laborfoulards gemäß Fig. 1 von links;

Fig. 3 ein Blockschaltbild einer Einrichtung zur Konstanthaltung des Füllstandes der Färbeflotte sowie

Fig. 4 - schematisch - eine weitere Möglichkeit der Ausbildung des Foulardvolumens.

A further development of the method is particularly preferred if a caster made of a non-absorbent material - preferably made of a polymer film - is also attached at the end of the strip of the material web. If the web is then wound together with the leading and trailing on a winding tube to a roll, it is effectively prevented that the color loss is affected by dripping of dye liquor or the action of atmospheric oxygen and the result is falsified. A different color dropout in the lateral edge areas can be effectively avoided if the side edges of the roll are additionally sealed against the ambient air after winding, which can be achieved, for example, by wrapping them with a self-adhesive film. In the drawing, an embodiment of a laboratory foulard according to the invention is shown. Show it:

Fig. 1 - schematically - the laboratory foulard in a view of the side facing the operator;

Fig. 2 - schematically - a view of the same laboratory foulard according to Figure 1 from the left.

Fig. 3 is a block diagram of a device for keeping the level of the dye liquor constant and

Fig. 4 - schematically - another way of forming the padding volume.

The laboratory foulard, designated as a whole by 100, comprises a horizontal one Base plate 1, which is supported by feet 2 on a flat surface 3. Of the Base plate 1 extends vertically upwards, a machine frame 4, which in essentially of two parallel to each other spaced plates 5, 6. You are using screws 7, 8 with the Screwed base plate 1.

On the plate 5 are on the side facing the operator Unwinding station 9, a winding station 10, deflection rolls 11, 12, tensioning rolls 13, 14 and a 2-roller squeezing mechanism designated as a whole as 15. The Tensioning rollers 13, 14 are each mounted on a boom 16, 17, which in turn about axes S, S 'which are perpendicular to the plates 5, 6 and can be pivoted to the Plates 5, 6 is articulated. The pivoting of the arms 16, 17 about the axes S, 1 can be overcome according to FIG. 1 by overcoming one in the drawing Not shown spring arrangement caused elastic force.

The unwinding station 9 and the winding station 10 each comprise one Expansion clamping core 18, 19 whose outer diameter can be changed optionally, in order to be able to non-positively receive a winding tube 20, 21. Both Expansion clamping cores 18, 19 are rotationally fixed, each with a shaft 22, 23 connected to each by means of a rotary drive 24, 25, which on the Viewer facing away from the side of the plate 6 is arranged, a torque to adjust the unwinding resistance or the effect of Winding operation and the adjustment of the winding tension can be effected.

The 2-roll squeeze unit 15 comprises squeeze rolls 26, 27, of which the one in FIG shown on the left by means of a rotary drive 28, which is also on the Operator side of the plate 6 is arranged, driven by rotation becomes. The squeeze roller 27 shown on the right in FIG Plates 5, 6 provided lever 29 rotatably mounted, which in turn by a Axis X pivotable on the machine frame. 4 is stored. By means of a pneumatically operated actuator 30, the lever 29 is in the sense a position of the squeeze roller 27 actuated against the squeeze roller 26, wherein by varying the actuation pressure, the line force in the between the Pinch rollers 26, 27 formed machining gap 31 can be changed.

The gusset 32 formed above the machining gap 31 is used for training of the padding volume 33 in which during the use of the laboratory paddle Dye liquor is located. The latter is by means of piston / cylinder units 34, 35 in the Foulard volume metered added, the piston / cylinder units 34, 35 are designed in the manner of an injection syringe. To actuate the piston 36 the piston / cylinder units 34, 35 have the upper ends of both Provide connecting piece 37 for compressed air lines so that the piston 36th pneumatically via lines not shown in the drawing, giving in the units of the dyeing liquor are moved to the padding volume 33 can.

To limit the padding volume 33 to that facing the operator On the side of the nip rollers 26, 27, a flat wall 38 is used transparent material, for example plexiglass. The wall 38 is on the Machine frame 4 attached that they in the region of the gusset 32 on the end faces the squeeze rollers 26, 27 abut in a strip-shaped area.

4 schematically shows a further possible embodiment of the padding volume shown, which can be used as an alternative to the use described above. It comprises a trough 40, in the region 41 near the bottom thereof a deflection roller 42 is subordinate. Coming around it, coming from the top left, web B the leading in the direction of arrow P the squeeze rollers 43, 44 of a two-roller squeeze mechanism 45 is supplied.

Furthermore, the laboratory foulard 100 comprises a control device with which the Operating pressure, the connecting piece 37 of the piston-cylinder units 34, 35th is supplied, depending on the level in the padding volume 33 in the sense a constant level is regulated. How the Control device so below with reference to Fig. 3, which is a block diagram this control device contains are explained. From a compressed air source compressed air at a pressure of approx. 6 bar. About one The pressure regulator 46 regulates the air pressure, which is at a first pressure meter 47 is applied. This is turned on in a pneumatic line 48 which with the Connection piece 37 of the piston-cylinder unit is connected.

The pressure prevailing in the padding volume 33 in its bottom area, that of the area of the liquid column in the padding volume 33 depends on a Pressure line fed a second pressure meter 50. The pressure gauges 47, 50 are with its signal outputs 52, 53 connected to a level controller 51, which the pressure values transmitted by the pressure regulators and the pressure regulator 46 in the In order to keep the pressure in the padding volume 33 constant controls.

The procedure carried out with the laboratory foulard is explained below become.

First, the unwinding station 9 is equipped with a winding tube 20 onto which First a section of a polymer film, to which the test sample is attached Web section and again a portion of a polymer film is wound. The latter is wrapped around the deflection rollers 11, 12 and the tensioning rollers 13 and 14 passed through the machining gap 31 and the beginning of Polymer film advance wound on the winding tube 21, so that the in Fig. 1st dash-dotted course of the web B results. Then the pre-filled Piston-cylinder units 34, 35, which together form a replenishing device 39 form, assembled and the pad volume 33 to the desired level with Dyeing liquor filled up. The spigots 37 are not with the in the drawing Compressed air lines shown connected via the actuator 30 of the desired line pressure set in processing gap 31 and in progress the drives 24, 25 and 28 continuously move the web B through the Machining gap 31 out. By regulating the 37 via the connecting piece Air pressure supplied to piston-cylinder devices will indicate the level Dyeing liquor in the padding volume 33 kept constant until the web Machining gap 31 has passed completely. The length of the between the Is located polymeric section to be colored section of the web dimensioned that at least 1.5 times the volume of dye liquor during the Pass of the web is taken away by this.

The section of a polymer film which is finally wound onto the winding tube 21 is with a self-adhesive film or known tape on the Secured winding against automatic unwinding and the front ends of the Wraps are made with the same self-adhesive material against lateral penetration sealed by atmospheric oxygen. The entire wrap is after relaxation of the Expansion spans 19 removed from the winding station 10 and one in the Drawing not shown dwelling station supplied, in which the winding up to Completion of the reaction between the dye in the dye liquor and the dye to be dyed Textile can linger.

The web is then unwound from the winding tube 21, removed, washed and dried and the color loss of the end area of the to be dyed web section compared with the desired color. Should the desired result has been achieved, the parameters of the Laboratory test transferred to the production foulard.

The embodiment of the laboratory foulard 100 shown in the drawing is for Sheets designed with a width of 100 mm. However, it is simple possible to adapt this laboratory foulard to other desired web widths to adjust, since only the length of the rollers on one side of the Foulards must be changed.

LIST OF REFERENCE NUMBERS

1.

baseplate

Second

feet

Third

document

4th

machine frame

5th

plate

6th

plate

7th

screw

8th.

screw

9th

uncoiling

10th

coiling

11th

deflecting

12th

deflecting

13th

tension roller

14th

tension roller

15th

Nipper

16th

boom

17th

boom

18th

Expansionsspannkem

19:

Expansion clamping core

20th

mandrel

21st

mandrel

22nd

wave

23rd

wave

24th

rotary drive

25th

rotary drive

26th

Nipper

27th

Nipper

28th

rotary drive

29th

lever

30th

actuator

31st

machining gap

32nd

gore

33rd

Foulardvolumen

34th

Piston / cylinder unit

35th

Piston / cylinder unit

36th

piston

37th

connecting branch

38th

wall

39th

Nachdosiereinrichtung

40th

trough

41st

Area

42nd

idler pulley

43rd

Nipper

44th

Nipper

45th

Two-roller squeezer

46th

pressure regulator

47th

First pressure gauge

48th

Pneumatic line

49th

pressure line

50th

Second pressure gauge

51st

level controller

52nd

signal output

53rd

signal output

100th

laboratory padder

S,

S 'axes

X

axis

B

web

Claims (23)

Laboratory foulard for carrying out dyeing tests on a running web,
with a padding volume (33) for the dye liquor,
with an unwinding station (9),
with a winding station (10),
and with means for guiding the web of material through the padding volume (33), characterized in that a replenishing device (39) is provided, by means of which dye liquor can be refilled through the padding volume (33) while passing through the web (B). Laboratory foulard according to claim 1, characterized in that the padding volume (33) is formed by a gusset (32) of a 2-roll squeezing unit (15). Laboratory foulard according to claim 1, characterized in that the padding volume is formed by a pool arranged under a squeeze mechanism. Laboratory foulard according to one of claims 1 to 3, characterized in that the replenishing device (39) comprises at least one piston-cylinder unit (34, 35) operating in the manner of an injection syringe. Laboratory foulard according to claim 4, characterized in that a pneumatically acting actuating device is provided for actuating the pistons (36) of the at least one piston-cylinder unit (34, 35). Laboratory foulard according to claim 5, characterized in that a control device is provided which generates a signal for actuating the actuating device, the size of which depends on the fill level of the padding volume (33). Laboratory foulard according to claim 6, characterized in that the control device comprises a sensor which comprises the pressure generated by the liquid column in the padding volume (33). Laboratory foulard according to one of claims 2 to 6, characterized in that the diameter of the squeeze rolls (26, 27) of the 2-roll squeeze unit (15) is identical to the diameter of the corresponding rolls of a production foulard. Laboratory foulard according to one of claims 2 to 8, characterized in that the squeeze rollers (26, 27) of the 2-roller squeeze unit (15) comprise a roller coating which corresponds to that of the corresponding rollers of the production foulard. Laboratory foulard according to one of claims 1 to 9, characterized in that the unwinding station (9) is designed in such a way that the unwinding resistance influencing the web tensile force on the part of the inlet into the padding volume (33) can be changed. Laboratory foulard according to one of claims 1 to 10, characterized in that the winding station (10) is equipped in such a way that the web tension influencing the web tension on the outlet side from the padding volume (33) can be changed. Laboratory foulard according to one of claims 2 to 11, characterized in that the 2-roll squeezing mechanism (15) is designed in such a way that the line force in the machining gap (31) can be adjusted. Laboratory foulard according to one of claims 2 to 12, characterized in that the squeeze rollers (26, 27) of the 2-roller squeeze unit (15) are supported on one side. Laboratory foulard according to one of claims 1 to 13, characterized in that all the rollers which are in contact with the web B during operation of the laboratory foulard are supported on one side. Laboratory foulard according to one of claims 1 to 14, characterized in that the winding and unwinding stations (10, 9) comprise expansion clamping cores (18, 19), the diameter of which can be enlarged for the purpose of non-positively receiving winding sleeves (20, 21). Method for determining the color loss of a web dyed using a dyeing liquor, with the following steps: continuously passing a strip of fabric (B) through a padding volume (33) containing a predetermined amount of dye liquor; Supply of dye liquor removed by web B in such a way that the amount of dye liquor in the padding volume (33) is at least approximately constant; Removing the material web (B) passed through the padding volume (33) and transferring it to a dwell station; Comparison of the color loss after removal of the web (B) from the dwell station with a desired color. Method according to claim 16, characterized in that the web tension on the side of the entry into the padding volume (33) is kept at a value which corresponds at least approximately to that in production. Method according to claim 16 or 17, characterized in that the web tension on the side of the outlet from the padding volume (33) is kept at a value which corresponds at least approximately to that in production. Method according to one of claims 16 to 19, characterized in that a web (B) of at least one length is passed through the padding volume (33) which is absorbed by the fabric (B) at least 1.5 times the padding volume of dye liquor. Method according to one of claims 16 to 19, characterized in that a course made of a non-absorbent material - preferably made of a polymer film - is attached to the beginning of the strip of the material web (B). Method according to one of claims 16 to 20, characterized in that at the end of the strip of the material web (B) a wake made of a non-absorbent material - preferably made of a polymer film - is attached. Method according to claims 19 and 20, characterized in that the material web (B) is wound with a lead and lag on a winding tube (21) to form a winding. A method according to claim 22, characterized in that after winding, the side edges of the roll are sealed against the ambient air.

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