DE1410851A1 - Dry cleaning device - Google Patents

Description

PATENT LAWYERS

Dr.-lng. HAN- * HUSGHKE

Dipl.-Inrj. K, 6RENTZENBERÖ

Whirlpool Corporation, St.Joseph / Michigan, V.St.A.

Dry cleaning advice

i) The invention relates generally to dry cleaning devices and to chemical cleaning processes, and in particular to improved hydraulic fluid flow for drying cleaning council, with chemical cleaning in programmed Can be carried out in the order, and where.in the case of the solvent not only continuously filtered during cleaning but also renewed during the following periods of the program, .vird, so aass a hydraulic flow control circuit for a new programmed Sequence is prepared.

The so-called " ^r l ⁿ rockenreini _; a; ung" is essentially a type of dry cleaning, whereby the cap and stains are removed from the materials using organic solvents or special tools and cleaning agents. In general, the way of doing 'i' skirt cleaning is to remove the greasy and resinous holes, ax from the garments, and fixtures

909840/122 6

BATH ORIGINAL

and other objects are collected, first to dissolve and then mechanically or by using an insoluble agent

to

by detergents / remove. The procedure was first carried out in France Used around the nineteenth century putty and is therefore sometimes referred to as "French cleaning", i ^ it the introduction of dry cleaning became complicated Machines developed, but so far not only significant Skill and experience in the operation but also an excessive capital investment required.

It is well known that when washing, the water causes the fibers ^ or threads become soft and in some cases their shape and strength change, for this reason the Deini dry cleaning products are used Liquids inert to textile fibers, and materials whose carefully A well-developed fit and exact shape are to be obtained, can normally only be followed by the dry cleaning process getting cleaned.

Many dry cleaning agents are flammable, so without take appropriate precautions the ikögiiciuceit that the static electrical discharge ignites volatile detergents, putting life and property at risk. As a solvent chlorinated hydrocarbons were used for cleaning uses which "materials, however, are recommended! -" Tetrachloride contain, as well as Percnloroäthylen and Trichloroäthylen, all of which are used as solvents in dry cleaning weraen.

According to the conventional methods, the Put the objects to be cleaned in a mechanical rotation Place a container that contains a suitable dry cleaning solvent contains. This treatment is followed by several rinses

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in fresh dry cleaning solvents, after which the items in a centrifugal extractor from most of the solvent freed and dried in a v / arm air stream. !To After drying, the materials are examined and any Remaining stains removed with special cleaning agents. The dry cleaning solvent used in the process is recovered and can be used after a renewal or regeneration can be used again.

According to the principles of the invention, a machine with an unusually compact structure can be created due to the novel hydraulic flow circuit used. In particular, according to the invention, a flow system for a machine is used, the work of which is controlled by a program control that can be set in advance i / is irksaiuiceit improved in the removal of the non-mixing with the solvent components, so that engages with the katerialien dry-clean only filtered solvent in .Berührung. .The pure solvent during the g extraction back to a provided in the flow conditioning solvent tank and the filter additives used are repelled at the end of the flow circulation through the system by backwashing as a result of the severity of the ligament,

i) The dry cleaning solvent used in the flow system Can be made from a suitable chlorinated hydrogen oestehen woiurcii the ureiahr of fires is avoided, and the hydraulic stripping circuit can with advantage together with A cleaning device is used as a deterrent

9098A0 / 122 6

BADORiaiNAL

1410051 I.

WaBchmasohine is suitable; 'so that with the lowest capital investment, A device can be created that provides the prediction of dry cleaning by means of a completely automatic machine that is easy to operate and economical to manufacture is. ■

The invention therefore provides:

a simply constructed dry cleaning device that is used by People with little experience and skill can be served, and the purchase of which requires little money,

an improved hydraulic flow system for a dry cleaning device, wherein the dry cleaning solvent is constantly filtered during cleaning, and wherein the fabrics to be treated are cleaned only in filtered solvent by a non-immersing process in a zone d _# ie from the contaminated and off solvents derived from the fabrics are removed, thereby preventing the dirt from getting back onto the fabric,

a flow system for a dry cleaning device, whereby during dta extraction and drying of a tank device again pure solvent is supplied, and wherein the impurities filtered out without significant loss of solvent from the Flow system can be easily removed as well

a dry cleaning method and an apparatus therefor with improved control means to carry out the cleaning and the Extraction in programmed work periods.

Many other advantages, features, and other objects of the invention can be seen from the following description of a preferred dry cleaning system according to the invention.

In the accompanying drawings is the 909840/1226

1 shows a schematic representation of a flow system for a

Trooken cleaning device according to the invention, Fig.2 a modified, differ from the arrangement according to Fig.1 ^ de embodiment of the invention, with only a single

Tank is used for the solvent, Fig. 3 a timing or program table for the control

the Trookenreinigungsgerätes with the hydraulic currents circulating ^H mung after Fig.1 or Fig.2, Fig.4- a circuit diagram for the control means for controlling _the;

device according to the invention are used, and Figure "5 is a schematic Darstellung'der air circulation system, the Λ in the dry cleaning device according to the invention uses

willo. !

The invention provides a dry cleaning method and method Device before which the washing, extracting and drying 'of pliable Textiles, for example items of clothing, is carried out in a single operation, and all of these should also be Functions in a single machine, preferably horizontal ϋ lying drum. Figures 1 and 2 show hence a machine with a horizontal drum, with the materials to be chemically cleaned in a drum with holes " circulated in a tank generally not having holes which drum is rotatable about a generally horizontal axis is stored. The materials move during this circulation due to the weight of the ligament accelerated through the treatment zone, which is formed by the rotating drum, with the at Lifting the potential energy gained in the treatment area is converted into kinetic energy, which is then used to hate the of the materials due to a sudden change in the gravitational acceleration of the mass due to the impact against the perforated inside

909840/122 6

the cylindrical wall near the lowest part bending of the treatment area. * '

. · The machine preferably contains a device for Letting in the liquid, 'being persistent in the treatment zone admitted a stream of filtered dry cleaning solvent that during the periodic processing with the Ma * materials come into contact.

The impact of the material saturated with solvent not only causes the materials to be thoroughly kneaded, but also removes a considerable amount of the solvent from the Materials pushed out so that these are able) fresh Purified solvent to replace that caused by the impact to absorb lost solvents. That with the impact, the materials Any solvent that is pressed out will also wash away the dirt particles contained in the materials.

The dry cleaning solvent used therefore decreases miscible and immiscible with the solvent in the treatment zone Impurities that form part of all the dirt contained in the materials. The Trooken cleaning agent with the impurities that have been picked up, the drum containing the fabrics to be cleaned then automatically runs off and returns to a solvent container used in accordance with the invention hydraulic flow circuit belongs.

Since the description of the components to understand the invention the dry cleaning machine. not required in detail only the main elements of such a machine are explained.

The machine shown in Figures 1 and 2, as a whole denoted by 5, has a general imperforate tank or

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- /. 1410861

i> Hin housing 6 _t the solvent is provided old a drain 7 and a Elnlassdüse θ extending outwardly loading on the tank 6

. and is directed towards the inside, so that through the nozzle β the. Öeinigungsmitfcel In an access opening 9 it is sprayed that on ^f the front wall of a rotatable drum provided with holes is arranged, which drum is optionally driven with circulating and SxtraktiOÄSdrehBahlen from a motor 11 via a conventional power transmission, which is shown achematically by the dashed line 12 connecting the drum 10 and the motor 11 . The solvent emerging from the nozzle 8

% el flows through the access opening 9, preferably in the form of a fan-shaped jet, through which the raised tissues fall,

place them on dl * solvent-free lower inside of the drum 10 bounce and push yourself hard.

The tank 6 is provided with a sump 13, which is arranged below the drum 10, so that all the solvent running off from the fabrics in the drum 10 contaminates neither the drum 10 nor the fabrics themselves. see that the method of operation of this dry cleaning device differs from the so-called immersion process, after which the fabrics are moved back and forth in a container with a tray cleaning agent. An important Vorsug ^of: vöeHegenden construction disclosed therein see eu that the draining from the tissues dirt entrained solvent is immediately derived from the tissues and the drum 10 so that 'is that the Schnute rejoin the tissue in substantially no danger · In this connection it is noted that the sump 13 is arranged far enough below the drum 10 so that all of the solvent draining from the drum 10 is stable

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BAD QfiHälNAi. i

discharged from the dry cleaning zone formed by the drum 10 and directed to a remote solvent container in which it is treated again and filtered before it is passed back to the tissues located in the drum 10 will.

Around the machine 5 with a dry detergent flow supply au, a pump 14 is provided according to the invention, which is driven by a pump motor 17 via mechanical means 16. The pump releases a certain amount of the dry cleaning agent under pressure and drives it through in the form of a current

^ a pipe 18 in which a shut-off valve 18a is arranged, which pipe to a filter device designated as a whole by 19 leads.

The filter device 19 preferably has several porous ones Pipes 19a which are arranged in a filter housing 19b and are carried by a partition or partition plate 19c, so that all of the solvent flowing through the filter device flows through tubes 19a, which are of conventional design and covered by a filter aid material can be obtained, for example from diatomaceous earth, to close the pores

ψ and make the filter more effective at filtering out dirt particles 1 micron and below.

The filter device shown in FIGS. 1 and 2 has an inlet 20 to which the pipeline 18 is connected is, as well as an outlet 21 to which the fiohrleitung 22 is connected is.

The pipeline 22 has two branches, of which one branch 23 contains a regulating valve 24. The pipe 23 is connected to the nozzle ä , which is arranged on the outside of the tank 6 .

90984 0/1226 net

is arranged and the solution center! flow through the drum opening 9 as a spray across the perforated cylindrical Sidewall of the drum 10 directs where the jet directly opposes the materials falling in the drum 10 during the circulation impacts. This flow enters the drum 10 in the direction of rotation of the drum and is at a point nearby the deepest part of the treatment formed by the drum 10

-v zone directed. '

The regulator valve 24 may be of an electrically operated type so that it can be controlled by the pre-settable timing device or the program control 60 according to the invention can be operated.

The pipeline 22 has a second pipe branch at 26 in which a pressure relief valve 2? is built in. This Valve opens by itself when there is pressure in the pipeline 22 reaches a predetermined value. Hence every time

. the valve 24 is opened, the cleaning solvent flowing through the pipe 22 is drained, through the pipe 2j5 to Machine 5 headed. When the valve 24 is closed, however, the pressure occurring in the pipeline 22 causes the pressure compensation valve to close 27 opens, which through the filter device 19 leaking cleaning solvents into branch line 26 flows. The opening and closing of the valve 24 therefore causes a

■ automatic üfinen and closing of the pressure relief valve 27 insofar as than the working of the flow control system of the present Invention is. This construction is preferable to an arrangement in which both valves 24 and 27 are electrically operated are, as a controlled operation of the two branch lines $ 2 and $ 26 through the simpler arrangement with less cost can be easily achieved.

9 0 9-8 4 07 12-2 8-

- ΙΌ - t

. The branch line 26 leads to a tank device, which after the invention can have two different embodiments. First of all, it can be seen from i'ig.1 that the branch line to a tank department 28a. that leads to the distinction as "tank for filtered solvent "shall be designated. Further is .A separate tank compartment 28b is also provided, which is designated as a "tank for unfiltered solvent" to distinguish it shall be. The two tank compartments 28a and 28b are separate from one another separated by a common Vifehr 29 so that the solvent from the tank for filtered solvent 28a into the tank 28b for unfiltered solvent can overflow if the asparagus des

'Solvent in tank 28a exceeds the height of tfehrs 29.

Both tank compartments 28a and 28b are at the bottom with the outlets 32 and 33 provided, which via a two-way valve 34 · with the Pump 14 are in communication, so that by the pump a certain Amount of solvent from either filtered solvent tank 28a or unfiltered solvent tank 28b deflated, pressurized, and pumped through conduit 18 can be. The bottom outlet 32 of the tank 28a is connected to the two-way valve 34 · through a drilling line 36 and the bottom outlet i 33 of the tank 28b connected by a drilling line 37, line drilling J Line 38 connects the two-way valve 34- to the pump 14 ·.

In the embodiment of the Er- 'shown in Pig. Finding a single tank is provided as a receptacle for the unfiltered as well as for the filtered solvent J

serves. The individual tank is shown in Fig.2 at 4-0, the {

through a drilling line 4-1 is connected to the pump 14, which consists of sucks solvent from the tank, pressurizes it, and pumps it through the well pipe 18.

From Fig. 1 it can be seen that the sump 13, which the • 90984 0/1228

killing solvents mixed with impurities, which Remove impurities from the materials to be chemically cleaned.

Ί

^ were removed, has an outlet / through which the solvent

via the pipe 42 into the tank 28b for unfiltered solution. medium expires.

The other embodiment shown in Hg.2 has the same arrangement, which is why the pipeline connected to the sump 13 also bears the reference numeral 4-2, as through this line removes the solvent from the machine 5 as a result of the Eigenecbwere in the tank 40 runs out.

In both embodiments of the invention, the filter device is provided with a tilt valve 43 19, the hopper illustrated with a \ Bchematisch 44 is connected for sediment, which contains a removable filter basket or container 44 and has a closure 46, through which the accumulating in the chute 44 Sediment can be periodically removed, as will be explained later, the sediment collected by basket 44a contains the previously applied coating material, the dirt filtered off from it, and the adsorbent additive used in the present device. This filter basket should be removed periodically and in practice is normally removed after the machine has been operated twelve times and emptied for the purpose of recovering the remaining solvent. Lies is in contrast to conventional dry cleaning devices, where the 'traps for the sediment normally have to be emptied after each use «

The tilt valve 43 is preferably with an electric Actuating or control means are provided so that the valve 43 of a presettable program control 60 according to the invention can be operated. Bas tilt valve 43 is on the lower part

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¹² 1410861 J.

the cone-shaped filter device 19 with a large From let β opening provided. Is the filter housing with! Solvent

completely filled, and the relief valve 43 is after completion When the flow circulation is open, the whole content is running the filter device 19 almost immediately into the trap a 44. To this one To speed up the process, the filter device is old . shut-off valve 47 communicating with the ambient air Mistake. It is also pointed out that the! Traps 44 for the sediment either with the! Thanks 26b for the unfiltered Solvent according to FIG. 1 or with the tank 40 according to FIG. 2 in connection, so that all dirt particles, the additives and the adsor located on the outside of the filter tubes 19a »" bitrendea funds are caught by Traps 44 while the expired solvents on the! Thanks 23b for the unfiltered » Solvent or the sink 40 only fell back into the hydraulic system will.

Biij & common feature of the invention is there * in eu see that · the automatic, under the action of gravity, Eiiokipülung the drill 19a from a. Amount fully filtered

Solvent is carried out, which is calibrated above the partition plate 19c is located. This ensures that ρ ends the tubes 19a de & tr backwash are in a clean condition * From the The essence of this backwashing also emerges from the fact that instead of the | Filter tube 19a filter of different designs with different formed filter surfaces for the purpose of achieving the same result · «» can be used *. . f *

In order to add certain additions to the flow system according to the invention introduce ones that promote and improve the cleaning process, Means are provided for inlets that can be connected to the hydraulic

@tromungskreis are connected. These agents are preferably '* 9098A0 / 1226

provided in afttai separate Binheitjaa. FIG. 1 shows the Toai 5Q unit with an electrically operated actuating device 51 which regulates the admission of the additional seat into the tank 27. The unit 50 can consist of a suitable funnel-shaped container and the actuating device of a spindle-shaped dispenser with a suitable actuating motor or. any other -4 £ t of. motor-operated valve device, so that the additive contained in the container 50 can be admitted through a drilling line into the tank 28a for the filtered solvent and thus into the hydraulic flow circuit. According to the invention, it is provided that the container 50 is filled with a supply of a filter aid material such as diatomaceous earth coating to provide, making the filtration efficiency home>> provided is improved when it is the removal of the non intermingling with the solvent components from the ^solution! Mittelstrom acts.

line second dispensing unit is shown at 53, which of a suitable electrically operated actuator 54 is regulated, wherein an additive is injected through a pipe 56 into the tank 28b for unfiltered solvent. In this case, too, the dispensing unit 53 can be made from a suitable container and the actuating device 5 ^ from a spindle-shaped one There are motorized dispensers or any other type of motorized valve device with their Help the additive through the Hohrleltung 56 into the tank 28b for the unfiltered solvent and thus in the hydraiisohen Flow circle can be admitted.

909840/1226

The invention gieht ago, dqn container · * 53 ait * tiaittel au fill a Zus that aioil 4um improving the removal "of Sioli» it to solvent-mixing components from 4-Lösuiige- 'mititfl8ijröfiiuB $ appropriated BaiJpieHiftiae abschiert activated carbon Ifaobetaf fe, the dissolve in the solution, while magnesia is capable of adsorption for the removal of fatty acids from the solvent flow of nuts, so that the "near ¹¹ state of the solvent is maintained. The contents of the container 53 can be made up of one or both of the. Are there any real additives? ”which remove the constituents from the solvent flow in the fluid inlet 19 by letting them into the hydraulic stoppers.

In practice, the container 53 is au " about 20% activated magnesia, 40% activated charcoal and 40% Diatomaceous earth filled. The activated Magnr ^ ia and the charcoal serve for the chemical treatment of the solvent, while the added diatomaceous earth reduces the porosity of the on the pilter surface the bore 19a of the separated filter cake is maintained and thereby the clogging of the filter by dirt particles is reduced. From the The schematic representation of the two dispensing devices in FIG. 5 ig.1 can be seen that in the sinking compartments 28a and 28b directly under the relevant containers 50 and 53 the shafts 50a and 53a are provided, which in turn have the corresponding Inlet openings of the pipes 32 and 33 are so that the Vilter auxiliary materials and the adsorbent additives form a slurry can form that settle immediately on the porous filter tubes 19a when these dispensing devices are operated. Although according to Figure 1, the additional material in the tank department of the ' Solvent tank is let in, so the material could of course

- * ■ - ■ · ■ - ^: · - ■■ - * 909840/1226

BATH ORIGINAL

~ ¹⁵ "141 OB B1

also let directly into the Sohrleifcuagta driving to the pump 14 will *, never 4 it β provided in the execution forai according to Fig. 2

is. . · ■ ';. ■■'.

In the arrangement, the 3? Lg »2 ifct stabbed the same kind of donor .device provided ^ which is why the corresponding rope «with (oil the same suspect numbers were vieefchen. Ei nipd j! Te do oh pointed out that the Abittovorriehtungen 50 and others. 55 dlt additive directly ic the sum inlet of the Pttaj * 14 fiilartaä · l ^ hrieitUiig 41 guide, the additional items in the LöaungaÄitt »liii; i? B» uag in the Pipeline 18 pumps »

As shown in FIGS. 1 and 2, there is a previous installation guide 60 on the machine 10. S # v prograBmplwQ. and Sihaltplan this PJcograüiisteu- "vung 60 are in the f & igurtn ■ unt 4 represented the« --fieosrim * control 60 has "inen Sfcltfctberaeter ftuf 61, the v * n the sohrit * -« else arbilteaden luiiiihryLqÄ β β, in can, uad the eighth periods of time a "a leash from Bchaltnookeisi 1 " - vague. Each of the SoMttaooks 1-9 has a suitable actuation surface on which the " ktt \ f JLne commanding switch" acts "" calibrate "Sohaltfeder nUkfcrtsöhe T * rbinaujig * n with." In the upper vein a "lower Jionta &t; herjifctllen, from EeanBBloendungegi? ÜBä-en sott the letter ^Μ Ϊ ^Μ 41 »BebHtt ^ ung des« animal contacts »and the letter" B "the indication Ass * nteven Kontakt · a by the concerned« goodbye stick. The switch of the fibcke 1 controlled switch “only has a single pulse which” is switched on with a Hetzaoheiltar 62 in ßeiiie and controls the supply of the main drive aofcore 11 of the machine 10 and the timing motor 61. Of course, Mm program control is usually connected to the electrical power supply network. connected. ^

809840/1228

, The following briefly describes the function of each of the in program control 60 provided cams are called. The Nooke 2 controls the power supply of the air heater via the upper contact 63 »which serves to heat an air flow directed through the machine 10, which air flow is used for drying or deodorizing of the materials located in the treatment zone of the machine 10 is required. A fan motor 64 is provided for this purpose, whose power supply is controlled by the Nooke 8, which fan motor air through the air flow circuit of the machine 10 presses that comes into contact with the materials to be chemically cleaned.

P The lower contact actuated by cam 2 controls this Hegulating valve 24 already described in FIGS. 1 and 2.

The upper contact actuated by the cam 3 controls the "operation of the air valves 66A and 66B which determine the direction" in which the air flows through the machine 10. The air flow circuit of the machine 10 is shown schematically in FIG. 5, according to which the fan motor 64 operates a fan 65 which presses air through one of the valve paths 66, 66 shown at A, the air flow through the two-way valve at 67 either into the ambient air drained or passed through a pipe 68 to a solvent! condenser 69, in which the solvent contained in the air condenses and is returned to the hydraulic flow circuit via a drain pipe 70 (Fig. 1 and 2), which after to the tank for unfiltered solvent of Figure 1 or · leads to the tank 40 according to the Fi, j.2. The air flow leaves the solution agent condenser through a pipe 71 and returns to the machine 5 via the other two-way valve 66 labeled B after it has been heated by an air heater 63. The two-way valves 66,66 shown at A and B are

909840/1226

mechanically linked as shown by the dashed line. 72 shown and are operated by a single duo gate at the same time. The valve B "of the valves 66,66 can be set up so that air is sucked in from the ambient air when the blower promoted air is discharged into the ambient air, for example during odor removal or during pre-drying.

Of course, suitable cooling devices can also be provided which keep the temperature of the solvent below a certain temperature. In this regard, it has been found that excessive discoloration can be prevented if the temperature of the solvent is kept ^{below 24 ° C.} Accordingly, a cooling device in the form of a cooling coil 74 is shown in both FIGS. 1 and 2, which is regulated by a temperature control device 76, which device controls the cooling unit labeled 76a, it being understood that the cooling device consists of a cold water system or a cooling system can.

From Figure 4 it can be seen that the actuated from the upper contact 4 Nooke the previously activated with 76 Hegler designated for the solvent cooler, while that of the Nooke betätig- λ th lower contact the glider for bei'77 illustrated the spin - or rotational speed controls. Of course, the Hegler 77 for the rotation speed can consist of any suitable speed change gear or a transmission which is used to change the rotation speed of the drum 10 arranged in the machine 5 from a rolling speed. a spin speed is required.

The actuated from the crouch 5 upper contact controls the Controller 51 of the dispenser 50, while that of the _ ETooke 5 operated lower contact the drain valve belonging to the filter device 19

909840/1226 ·. 43

- "OK -

43 controls.

The upper contact actuated by the Nooke 6 controls the · Controller 54 of the dispenser 53, while the lower contact ein.Regler in the form of a valve 80 (FIG. 5) which controls the solvent condenser 69 is assigned. This could ondensatoranlage . For example, consist of a cold water or a cooling system. The nooke 7 controls the power supply to the pump motor 17, while the nooke 8, as already mentioned, controls the fan motor 64.

After the description of the operating elements of the dry cleaning device according to the invention, the one shown in FIG program control shown.

The schedule for a complete working cycle of the dry cleaning device or the Ötrömungskreises according to the invention can generally be broken down into five distinct parts or periods. The schedule includes the pre-drying, washing, "Extraction, drying and deodorization period. In each case, if the dry cleaning device has started a new work sequence starts, all dry cleaning solvent is completely filtered, and the filter elements of the filter device 19 are completely free of filter aid material represented by the additives admitted from dispensers 50 and 53 will. Therefore, the complete duty cycle of the dry cleaning device can vary depending on the individual parts of the Cycle operations are divided as follows:

Pre-drying

Pre-drying is provided to remove excess moisture in clothes that are generally sent for dry cleaning. This is done because of the

909840/1226

relative humidity in the system does not exceed 75 # allow. As has been shown, an excess of 75! # Leads relative humidity for chemically cleaned rubbish excessive shrinkage and wrinkling.

During the pre-drying period, the items are placed in the drum of the machine 10 and a stream of air at the appropriate temperature is passed through the treatment zone. Here, air is taken from the atmosphere through the valve 66B, passed through the heater 63 through the machine and through the blower 65 and vented back to atmosphere through valve 66A at 67. Is it should be noted that at a high relative Humidity of the indoor air changed the air flow path can be that the air through a closed air flow circuit and is passed through the capacitor 69

Apart from the actual drying of the fabrics to be cleaned, two other important ones play a role in the pre-drying period Operations. The act is that the pump 14- either the lank department 28a for the filtered solvent removes solvent according to Figure 1 or the tank 4u according to Figure 2, pressurized and through the coating-free filter elements 19a of the filter device ^ 19 and under the control of g the overpressure valve 27 but the tube 26 back to the tank 27 or to the tank 40. Do a short time interval the actuating device 51 of the dispenser actuated and a certain narrow filter aids, e.g. diatomaceous earth, in the tank 20a for the filtered solvent or in the drilling line 41 let in, from where it is pumped to the filter elements will. This diatomaceous earth then quickly forms a filter aid coating on the outside of the filter elements, whereby the

909840 / 12-26

the 'effectiveness of the filter device is increased.

The second process that takes place during the pre-drying period is that the solvent is passed through the cooling coil 74-. By this measure, the temperature of the solvent can be kept below 24 ⁰ O at the most. Both processes take place in a relatively short time and are over at the end of the pre-drying period? Of course, the length of the pre-drying period can be determined by the timer device so that it extends, for example, over five time intervals, as shown in the programming table in FIG The length of the pre-drying period is only measured to the time required to remove the

the same amount of moisture is required from the tissues to be cleaned will. This regulation of the relative humidity also provides a means of keeping the relative humidity at a value hold, in which the tissues are certainly better cleaned.

bottles

After the pre-drying period has expired, the dry cleaning device begins with the v / ash period. At this point in time the heating elements 65 are switched off and the valve 24 is opened, so that the dry cleaning solution medium emerging from the filter device 19 through the pipelines 22 and 23 into the machine 5 is passed and comes into contact with the items of clothing circulated in the drum 10.

In the arrangement according to FIG. 1, the two-way valve is also used opened so that the tank 2feb unfiltered solvent

9 0 9840/12 2 6

is removed instead of from the tank 28a for the filtered solvent. In the arrangement according to FIG. 2, the pump 14 Of course, always 40 liters of dry cleaning solvent from the tank pumped out.

The solvent that collects in the sump 13 of the machine 5 runs back to the tank due to its intrinsic gravity, namely in the tank compartment 28b for unfiltered solvent in the arrangement according to ^{FIG. 1} and in the tank in the arrangement according to B 1 Ig.2 40.

furthermore, at the beginning of the ash period, the actuating means 54- of the dispenser 53 actuated so that in the liquid flow circuit another additive is admitted, for example activated carbon and adsorbent magnesia, removing dyes and fatty acids from the solvent, which impurities are then removed from the system by the filter elements in the filter device 19. Simultaneously with the clogging these adsorbents are dispensed by the dispenser 53 other solid additives such as diatomaceous earth introduced into the system, die.irOrosität the filter cake or the filter elements 19a obtain. Since the drum 10 containing the fabrics to be cleaned does not rotate through a container of solvent, so there is the solvent sprayed on the fabric to be cleaned Completely made of filtered solvent, whereby the dry cleaning is promoted significantly by the fact that the new Reduced accumulation of dirt and a stiff impact surface for which tissue is created. -

extraction

When the washing period is over, the machine will start the extraction. At this point in time the drum is opened by the controller 77

909840/1228

the spin speed accelerates and the valve. 24 closed, so that no more solvent is let into the drum 10

. “In addition, the cooling of the solvent is interrupted

the

Pump 14, however, is still "operated" so that solvents flowing through the system are passed through the pipe 26 either back to the tank compartment 28a for filtered solvent in the case of the arrangement according to FIG. 1 or back to the tank 4-0 in the case of the arrangement according to FIG. 2 So while the machine continues dry cleaning, the solvent will be ready for the next dry cleaning cycle.
& During this period the tank compartment 28a fills with filtered solvent and flows through the weir 29 into the tank compartment 28b for the unfiltered solvent, while the circulation continues. So that there is enough time available for a complete preparation and filtering of the entire unfiltered solvent, this particular phase of the solvent circulation can be continued into the drying period; it is also provided that the pickling elements 63 are also supplied with electricity during the explosion period to preheat the system and shorten the drying period.

T r ο c-k η e η

Each time the extraction period ends, the timer motor 61 is put into operation and actuates the necessary i-elements, whereby the heating element 63 receives power and furthermore the air flow system is put into operation by suitable actuation of the valves 66,66 (A and B), so that Air flows through the solvent condenser 69. In this way, solvent can be recovered from the air stream and the flow system according to the invention *

90 9840 / 122β

be fed back when the solvent-enriched Air flows through the condenser 69, so the solvent is condensed and then through the pipe 70 back to the tank 4Q 2 or to the tank compartment 28b for unfiltered solvent guided in the arrangement according to Fig.1.

After the drying period continued long enough has been designed to treat and filter all of the solvent, the pump 1.4 is put out of operation by switching off the pump motor 17 * A backflow of the solvent and the Additions from the filter device 19 through the pipeline 18 is provided by the shut-off valve 1öa provided in the pipeline 18 prevented. This is the circulation of the dry cleaning solvent ended in the hydraulic flow circuit.

At this point in time, the drain valve 4 $ on the lower part of the filter device 19 is actuated. Since the filter housing is completely filled with solvent, and since a relatively wide opening is available on the filter housing for drainage, all of the solvent drains almost immediately into the shaft 44 for the sediments and leads the dirt and the filter coatings with it were added during the pre-drying and washing periods. This sudden flow favors the preparatory g processing of the filter elements for coatings new beginning of the next full dry-cleaning cycle. The shaft 44 at the lower part of the filter device 19 allows the solvent to flow back into the tank 2öb for unfiltered solvent in the case of the anoranun ^ according to the FX3.I or in the tank 40 in the arrangement according to FIG. 2, with the Schmitz and the filter covers collect in the sediment container 44a and. can be removed periodically with the aid of the access opening 46, after the end of the emptying period 909 840/1226 ~~

perlode of the filter device, the machine sets that of the timer device controlled dry cleaning cycle without any solvent in circulation.

The effectiveness and the inconvenience of emptying this filter through the drain can be increased with the aid of an air pressure which is generated in the filter device 19 during this backwashing. '

In this context, reference is made to the accompanying drawings referenced, from which it can be seen that into the filter device 19 through the outlet 21 through the upper wall

fc a pipe 22 protrudes. By taking place in one direction Flow of the liquid through the tubes 18, 20 and 22 and through the filter device 19 is prevented from flowing through the filter device 19 flowing cleaning liquid completely fills the upper part of the filter 19 due to the air pocket or the air cushion that Q das) is in the upper part of the filter 19 due to the bell formed as a result of the relative disposition of the lower end of the tube 22 with respect to the upper end of the Filter device 19 is. This air cushion has during cleaning, when the liquid flows through the filter 19, little or

™ even Jieine Jirkung, however, is of use during the described Backwashing when no more liquid flows through the pipeline 1ö.

«During the split back, this air cushion, which at the previous filters compressed by the existing operating pressure against the kenge of that in filter 19 at the end of the filtering period The remaining liquid is released with the result that the reflux due to the excess weight caused by the release that included in the upper part of the filter 19

* ". 909840/1226

compressed. Air is strongly supported. The consequence is one faster and more powerful backwashing through the filter tubes 19a of the liquid pressed through this.

Although the air pressure is to get more favorable results supported, however, the return occurs completely by itself as a result of its inherent gravity and does not depend on this air pressure.

Of course, other kitte1 can also be used to achieve this applied this bell effect with the same results be, for example, the upper wall of the filter 19 after be vaulted inside. This thought of support through Air also extends to the use of a compressed air containing tanks (not shown), via a pipeline is in communication with the filter device 19, wherein the supply, the compressed air under the control of an electromagnetic actuated valve takes place during backwashing is operated by the program controller 60.

j3eodorization

On the 1st of the trocia period, the timer motor 61 moves the crouch of the pre-settable program controller 60 in the deodorizing part of the full duty cycle. Here the Power supply for the heating elements 63 is switched off and the capacitor 69 decommissioned. The air flow circuit is changed by means of valves 66,66 (A and B), with air from the The atmosphere is circulated through the machine and released into the atmosphere, leading to the. Deodorizing period from the clothes to be cleaned and from the machine unwanted g-results removed.

The end of the deodorization period also ends

909 8 40/1226

the full cycle of dry cleaning for those in the machine tissue and clothing items to be cleaned, and the entire liquid flow system has been prepared in such a way that a new dry cleaning cycle can begin immediately if desired.

It is pointed out that in the case of the air flow system According to the invention, a solvent can be used which is an appropriate amount of a surfactant or a Detergent, for example 1-4%. Since the detergent is in the

irocüen cleaning solvent is completely soluble, it will

not filtered out, so a flushing period is not required is, so that when you put on the v / ash period immediately the extraction period can follow.

Although minor changes and modifications can be made to the invention described by experts, so these are to be regarded as falling within the scope of the invention. The invention itself is only supported by the accompanying address delimited.

Claims 90984071226

Claims (9)

Claims 1) Hydraulic flow circuit for a dry cleaning device, characterized by a device that forms a treatment zone in which materials are to be chemically cleaned, through a device forming an inlet for the said zone through which permeable solvent is passed into the zone, through a device, which has an outlet at the lower part of the zone through which the liquid is drained from the zone, through a filter located upstream of the inlet, through a first conduit connected to the inlet and the filter and containing a control valve, the zone being filtered Solvent is supplied when the control valve is open through a second pipe connected to the filter with a pressure relief valve, whereby the pipeline is automatically fed solvent driven through the filter, when said control valve is closed, by a pump with an inlet and an outlet, through a drilling line connecting the pump outlet to the filter, which is required by the pump Solvent passes through the filter through a third pipe, comprising a solvent tank, which leads to the pump inlet and is connected to the second pipeline, whereby a solution reservoir for the pump is formed, and through a fourth pipe connecting the zone outlet to the solvent tank. 90 98 40/1226 2) Hydraulic flow circuit according to claim 1, characterized in that that said control valve and the pump have electrically controlled actuation means, and that a program control device is provided which automatically controls the control valve and operates the pump during a series of wash and extractions periods. 3) Hydraulic flow circuit according to claim 1, characterized in that that said third pipeline has an opening, and that means for admitting an auxiliary filter material into the third pipe to improve the effectiveness of the filter are provided. 4) Hydraulic flow circuit according to claim 1, characterized in that " shows that the filter at the bottom (Deil has an outlet opening with a drain valve, that with the opening is connected to a shaft for sediments, and that a means for draining the liquid Solvent from the shaft is provided in the solvent container. 5) Hydraulic flow circuit according to claim 1, characterized in that that the filter has porous filter elements through which all of the liquid in the flow circuit is in circulation Solvent is passed, and that dispensing devices are provided, which in the flow circuit a certain length (1) Introduce a filter aid material that temporarily reduces the porosity of filter elements reduced, with aeren. Efficiency in removal of constituents from the solvent which do not mix with the solvent increased, and (2) a certain length 909840/1228 from of solvent improving adsorbents to to remove the components that are mixed with the solvent from the solvent passed through the porous filter elements, ' distant, 6) Hydraulic flow circuit according to claim 5, characterized ge - '"■ indicates that said control valve, said pump and said dispensing devices are electrically controlled actuating means have, and that a previously adjustable program control device is provided, which automatically operates the j flow control circuit over a sequence of - / ash and extraction periods. · 7) Hydraulic flow circuit for an iTOCken cleaning device, characterized by a drilling line device which has a hy- ■-hydraulic circuit forms the Ziufuhren liquid solvent durcii a pump in the hydraulic xu? Ice, the orm the liquid solvent at elevated pressure in B ^v at a flow drives, by Abgebereiririchtungen which are connected on the upstream side of the pump with the Stromungskreis, and a filter with porous filter elements in the flow circuit on the downstream side of the pump for removing components from the flow that do not mix with the solvent, which said Abge'beeinriohtungen contain a supply of additives that are suitable for forming a coating on the filter elements, before cleaning is started, thereby improving the efficiency of the filter, by means of a device which forms a treatment zone on the downstream side of the filter in which, during a washing period, the solvent mixes and do not mix 909840/1226 Impurities are removed and carried along by the solvent, ' which pipeline equipment bypasses the treatment zone Lower circle with a tank. On the upstream side of the pump inlet and on the downstream side of the filter, which has a solution • middle! Reservoir for the flow circuit, with the Clear, filtered solvent is added to the tank when the treatment zone is bypassed by the secondary circuit. 8) Hydraulic flow circuit according to claim 7> characterized in that that the filter device has a drain valve through which, during a backwashing process, when the solvent flow is terminated through the filter device from the filter elements mentioned as a result of the heavy dirt and used filter additives fall out. 9) Hydraulic flow circuit according to claim 7> characterized in that the dispensing device has a separate dispenser for admitting an additive into the flow circuit, which is used to adsorb and remove itself with the solvent mixing ingredients from this is suitable. 10) Hydraulic flow circuit according to claim 7 »characterized in that that a previously adjustable program control device is provided, and that of the program control device operated separate control means for the pump, the dispensing device and the above-mentioned lifting circle are provided, with the system automatically via a programmed cycle of iVasch- and extraction periods is operated. 9098 40/122 6 11) Hydraulic flow circuit according to claim 7, characterized in that said tank has a first tank compartment for filtered solvent located in said JSfebenkreis and a two tank compartment for unfiltered solvent located downstream of the treatment zone as well as an overflow medium leading into the second tank compartment , and that a pipeline with a two-way valve is provided, which connects the two tank compartments with the pump, whereby solvent can optionally be discharged from one of the two tank compartments. 12) Hydraulic flow circuit according to claim 11, characterized in that that the dispensing device has a first dispenser, which is connected to the first tank department, for admission an additive suitable for the previous coating of the Filter elements are suitable to improve their effectiveness in removing the constituents that do not mix with the solvent, as well as a second dispenser, which is connected to the second tank department, for admitting an additive, which is suitable for adsorbing and removing the constituents that are mixed with the solvent therefrom. I. 13) hydraulic flow circuit according to claim 12, characterized by a program control device that can be set in advance with the control means actuated by these, the pump, the first and operate the second dispenser and said two-way valve automatically for a cycle of v / ash and extraction periods. 098 40/12 26 14) Irook cleaning device for dry cleaning in one programmed work sequence, characterized by a drilling line device, which forms a self-contained hydraulic flow circuit in which a borate of a liquid solvent is set in circulation by a pump arranged at one point in the flow circuit, the liquid solvent in the form of a The flow drives through a filter device arranged at a second point in the flow circuit for separating the from the solution medium entrained impurities from the flow, through an inlet device in the flow circuit upstream of said one point for admitting a filter additive material which is related to the preceding Formation of a deposit on the filter device is suitable and adsorbs the impurities mixed with the solvent, whereby the separation of the impurities carried by the solvent is improved by one at a third point arranged in the flow circuit, forming a treatment zone Device for the optional inclusion of the named, with the chemically flow coming into contact with materials to be cleaned, whereby the impurities mix with the solvent and are carried away by it, through an upstream stream arranged by said one location, a storage container forming means having valve control means between said container and the treatment zone, wherein the solvent from the treatment zone and optionally from a point in front of the treatment zone to the container again will, and by a device for optional, by the inherent gravity caused draining of the used filter additives from the filter device when the flow through the flow circle, with the solvent flowing through the flow circuit in a, 9098 4 0/122 6 0851 Order can be put into circulation that has a period of previous formation of a topping, a period and a Extraction period includes being filtered solvent during is returned to the said container during the extraction period, around the flow circuit for a new programmed work sequence prepare. Dry cleaning device for automatically cleaning in a programmed Heihenfolge, characterized by a device far a self-contained flow circuit, a liquid A is a solvent, by at a position in the flow circuit a treatment zone defining means, by a rotatable! Drum in the treatment zone for circulating a jkrasse of materials in the flow path to be cleaned, the impurities and foreign particles being washed out of the materials, mixing with the solvent and being taken up and carried away by the flow, through a sump below the treatment zone at a second point in the flow circuit, in which the solvent runs off from the treatment zone as a result of its inherent gravity, through a device that forms a reservoir 'for the flow circuit in which the solvent containing the impurities and foreign particles is formed with the formation of a solvent Ivor rat es sa mmelt, by a pump in the flow circuit, which pumps out a narrow solvent from the above-mentioned "storage tank, pressurizes it and drives it through the flow circuit in the form of a flow, through a filter device arranged at a third point in the flow circuit to clarify the flow of the from the jcumpe. required solvent, whereby the impurities and foreign matter e from the flow are shown out, and by a 909840/1226 • Overflow control device in the flow circuit, which optionally sets the flow of the clarified fluid from the treatment zone back into circulation or, by bypassing the treatment zone, directs it directly to the mentioned storage container, with a drying period by re-circulating the clarified flow to the "storage container and bypassing it is operated at the treatment zone, during which drying period the materials in the treatment zone are centrifuged in order to extract the solvent remaining in the materials, the extracted solvent running off during the drying cycle to said second point in the flow circuit, the filtered one during the extraction Solvent can be directed back to the named container in order to prepare the flow circuit for the next programmed work sequence. 16) Dry cleaning device for automatic cleaning in programmed Sequence, characterized by a device that creates a self-contained flow circuit for a liquid solvent forms, through a treatment zone provided at one point of the flow circuit, in which the flow of solvent counteracts A circulated mass of materials to be cleaned is directed, with dirt and foreign matter being washed out of the materials and admixed with the solvent and carried away by the flow, through a reservoir to a The second point of the flow circuit forming an establishment in which the solvent from said one point in iorm one unfiltered amount is collected by a pump attached to a third Place the flow circuit that pressurizes a lot of solvent from the container with unfiltered solvent and as a current drifts through the flow circuit, through a i'iiter- 909840/1226 Facility device at a fourth point of the flow circuit for clarifying the solvent flow by separating dirt and foreign matter from the flow, through a valve device in the flow circuit for re-circulating the flow of the clarified solvent around said one point, , holder forms by means for passing directs the flow of the clarified solvent on said one point by a device which ι a loading filtered solvent in which the clarified] flow is collected, the by valve means in order to feed solvent from Filtered solvent container for pressurization at said third location, and through | an overflow means for the excess solvent clarified in the container for filtered solvent into the container for unfiltered solvent, the solvent supply being prepared for a new programmed work sequence during the drying period. 17)! Erockenre inigungsgerat according to claim 16, characterized by Devices in the flow circuit for admitting filter aid additives into the flow circuit prior to the wash period, improving the clarification of the solvent flow on the filter. I. 18) Tr ocnenreinigungsgerat according to claim 17, characterized by a device in the filter for draining the separated dirt and foreign particles as well as the filter aid additives at the end of the washing period. 19) 909840/1226 19). Dry cleaning device, characterized by a housing, by a drum rotatably mounted in the housing for receiving and circulating the fabrics to be cleaned, by a drive means that sets the drum in rotation, through an inlet nozzle that guides the solvent into the housing, through a solvent tank for receiving a solvent supply and filter aid material, through a drain opening in the housing which is in connection with the solvent tank into which the solvent drains from the dehäiiee, through a filter device with a filter surface for filtering the solvent, through a first pipe that connects the solvent tank with the filter device, through a second pipe that connects the filter device to the solvent tank, through a third pipe that connects the filter device to the solvent inlet nozzle, through a pump device in the first pipe for pumping VGn! the solvent tank through the filter device, and through a third pipeline for automatically circulating the solvent flowing out of the filter device first through said second pipeline, the perforated filter being covered with a coating of said filter aid material, and then through the · Third pipeline, whereby the fabrics are cleaned with filtered solvent. 20) Dry cleaning device, characterized by a housing, by a perforated drum rotatably mounted in the housing for receiving and circulating tissues to be cleaned, by a Drive device that sets the drum in rotation through a solvent inlet nozzle that directs solvent into the housing through a solvent tank for receiving a supply of solvent and of filter aid material, through an AD runner opening 909840/12 26 in the housing, which is in communication with the solvent tank, in the constant solvent from the housing in the solvent ' tank drains, with a substantially solvent-free stiffness Impact surface created for the aforementioned tissue and the re-deposition of dirt on the fabrics during their cleaning is reduced by a filter device with a filter. area for filtering the solvent, through a first pipe, -v that connects the solvent tank with the filter device, through a second pipeline that connects the filter device to the Solvent tank connects, through a third drilling line, which connects the filter device with the solvent inlet nozzle, by a pump device in the first pipeline for pumping solvent from the solvent tank through the filter device, and by a control device with a valve in the second and third pipelines for automatic circulation of the solvent flowing out of the filter device first . through the second pipeline, the perforated filter surface covered with a coating made of said filter aid material is, and then through the third pipeline, with a cleaning the fabric is effected with filtered solvent. 21) dry cleaning device, characterized by a housing, through a perforated drum rotatably mounted in the housing for receiving and circulating the fabrics to be cleaned, through a Driving device that sets the drum in rotation, through a solvent inlet nozzle that brings the solvent into the drum passes through a solvent tank for a supply of solvent and a filter aid material, through a drain opening in the Housing, which is in communication with the solvent tank, into the the solvent let into the drum drains through a 909840/1228 Filter device with a filter surface and a drain which is in connection with the solvent tank, through a drain valve, which normally excludes a connection of the filter device with the solvent tank through the drain, through a holder for a filter aid material, which is below the filter device is arranged and serves to filter out the filter aid material from the solvent released from the filter device through the drain valve, through a first pipe that connects the solvent tank with the filter device, through a second pipe that connects the filter device with the solvent tank, through a third pipe , which connects the filter device to the solvent inlet nozzle, by a pump device in the first pipe for pumping solvent from the solvent tank through the filter device, through a second valve in the second pipe, through a third valve in the third tube, and by control means which in sequence control the second and third valves as well as the drain valve and the pump device in such a way that the solvent flowing out of the filter device is automatically circulated first through the second pipe, the ) filter surface with a coating is provided from the filter aid material, and then through the third pipeline, causing a cleaning of the fabric with filtered solvent and finally the flow of solvent through the filter device is terminated with the result that a backwashing of the filter surface is automatically effected due to the inherent gravity and the filter aid material falls through the said drain and the drain valve into the drop container. 909840/1228 Dry cleaning device after. Claim 21, characterized in that that the filter unit is provided with a shut-off valve that allows the air pressure to be equalized in the filter device during backwashing of the filter surface. 23) dry cleaning device according to claim 21, characterized in that the first drilling line is provided with a shut-off valve that prevents the liquid from flowing back from the filter device into the solvent tank. 24) dry cleaning device according to claim 21 y characterized by a device operated by said control device device for automatic admission of filter aid material into the Solvent tank. 25) dry cleaning device according to claim 21, characterized in that that a partition is provided that the solvent tank into a first and a second compartment for receiving the solvent - divides, whereby the first division takes up solvent from the second pipe and the second division takes up solvent, which runs out of the housing and the filter device. 26) dry cleaning device according to claim 25, characterized in that that said partition consists of a weir and enables the solvent to flow over from one tank department into the other » 27) dry rinsing device according to claim 25, characterized through a two-way valve with one outlet communicating with the first pipeline and two inlets communicating with 909840/1226 the first resp. the second, the solvent receiving tank > from the department. 28) dry cleaning device according to claim 21, characterized duroh a means that automatically exerts an air pressure on the filter surface during its backwashing. 29) i'dry cleaning device according to claim 21, characterized by a means that works automatically during the flow of liquid through the first conduit and the filter device traps and compresses air in the filter device, which in the As a result, the filter surface is released during backwashing and penetrates it. 30) dry cleaning device, characterized by a housing, by a perforated drum rotatably mounted in the housing for receiving and circulating tissues to be cleaned, by a Driving device, which sets the drum in rotation, through a solvent inlet nozzle, which brings the solvent into the drum passes through a solvent tank for a supply of solvent and a filter aid material, through a drain opening in the Housing, which is in communication with the solvent tank, into the the solvent let into the drum runs off continuously, through a filter device with a filter surface and a drain, communicating with the solvent tank through a Drain valve that normally connects the filter device blocks with the solvent tank through the AD run, through a case for the auxiliary iilter material, which is below the filter device is arranged and for filtering the auxiliary filter material from the filter device through the drain valve 9 0 9 8 4 0/1226 " . . U10851 released solvent is used through a first pipeline, which connects the solvent tank with the filter device, through a second pipe that connects the I-filter device to the solvent tank, through a third pipe that connects the Filter device connects to the solvent inlet nozzle by a pump device in the first pipeline for pumping Solvent from the solvent tank through the filter device, by a pressure relief valve in the second pipeline, by a control valve in the third pipeline, and by control means, the rihenfο! appropriately the control valve and the drain valve and control the pump device in such a way that the solvent flowing out of the filter device automatically first passes through the. overpressure valve and the second pipe is put into circulation, wherein the filter surface is covered with a cover made of filter aid material covered, and then through the control valve and -the third Pipeline, whereby a cleaning of the fabric is effected with filtered solvent and finally the solvent flow is terminated by the filter device, with the result that backwashing of the filter surface is automatic due to its inherent gravity is effected and the filter aid siiimaterial through the said process and the drain valve falls into the fall container. j . '' Dry cleaning device, characterized by a device the one closed .. flow circle for a dry cleaning solution bitcel forms and has a filter and a filter container, by means of a treatment zone with forms an inlet and an outlet in which the oil materials to be cleaned come into contact with the rock cleaning solvent are brought, and by a program control device that can be set in advance to operate the device automatically via 909840/122 6 programmed sequence of washing, extraction and drying periods away, which control device valves and a motor-driven Pump in said ütrömungskreis comprises, by the program control device "Controlled so that optionally filtered solvent through the treatment zone during a \ ifasch period. is put into circulation, but the filtration cycle by bypassing the treatment zone during the extraction and the drying period continues. 909840/1226