DK155922B

DK155922B - DEVICE FOR SCAN CLEANING OF LARGE AREAS, NAME SERIGRAPHIC FRAMES

Info

Publication number: DK155922B
Application number: DK373277AA
Authority: DK
Inventors: Lars Kristoffer Wendelb Jensen
Original assignee: Lars Kristoffer Wendelb Jensen
Priority date: 1976-08-28
Filing date: 1977-08-23
Publication date: 1989-06-05
Also published as: NO772945L; FI69577B; DK155922C; DK373277A; DE2737420A1; IT1114409B; FI69577C; FI772547A; SE7709392L; GB1591370A

Description

iin

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Den foreliggende opfindelse angår en fremgangsmåde til skånsom rensning af store flade emner, navnlig serigrafirammer, omfattende en flad støtteindretning for emnerne og midler til påsprøjtning af rensevæske mod disse.The present invention relates to a method for the gentle cleaning of large flat parts, in particular screen frames, comprising a flat support device for the articles and means for spraying cleaning liquid against them.

5 Det er velkendt at udføre en rensning af emner ved hjælp af en cirkulerende mængde rensevæske, som gennem dyser sprøjtes ind mod emnet enten direkte eller i forbindelse med bløde, roterende børster. For fjernelse af overskudsfarve fra afbenyttede serigrafirammer har man enten foreta-10 get en rent manuel afbørstning i rensevæske eller benyttet rensemaskiner med roterende børster og udsprøjtning af rensevæske gennem dyser. Den manuelle metode er meget arbejdskrævende og medfører alvorlige miljømæssige og driftsøkonomiske ulemper på grund af den fordampning af rensevæske, 15 som finder sted under arbejdet. Også i de nævnte særlige rensemaskiner forekommer en væsentlig fordampning, fordi de arbejdende børster kræver et forholdsvis stort rum omkring emnet, og fordi det er vanskeligt at udngå en damp-udtrædning fra dette rum i forbindelse med emnernes ind-20 og udslusning. Hertil kommer imidlertid at de roterende børster ikke er fuldt effektive ved visse indvendige hjørne- og kantpartier på rammerne, samt at dyseudstrålingen af rensevæsken kræver en forholdsvis ren væske for undgåelse af tilstopning af dyserne; det er imidlertid uundgåeligt, 25 at den cirkulerende væske forurenes stærkt af de afvaskede farvestoffer, og det er derfor almindeligt, at sådanne ren-seapparater indbefatter et destillationsudstyr, som medvirker til at gøre apparaterne særdeles kostbare.It is well known to perform a cleaning of blanks by means of a circulating amount of cleaning fluid which is injected through the nozzles towards the blank either directly or in conjunction with soft, rotating brushes. To remove excess paint from used screen printing frames, either a purely manual brushing in cleaning fluid or cleaning machines with rotating brushes and spraying of cleaning fluid through nozzles have been performed. The manual method is very labor intensive and causes serious environmental and operational disadvantages due to the evaporation of cleaning fluid that takes place during work. Also in the particular cleaning machines mentioned, significant evaporation occurs because the working brushes require a relatively large space around the workpiece and because it is difficult to escape a steam exit from this space in connection with the workpieces and extinguishers. In addition, however, the rotating brushes are not fully effective at certain interior corner and edge portions of the frames, and that the nozzle radiation of the cleaning fluid requires a relatively clean fluid to avoid clogging of the nozzles; however, it is inevitable that the circulating liquid is heavily contaminated by the washed dyes, and it is therefore common for such purifiers to include a distillation apparatus which contributes to making the apparatus extremely expensive.

30 Opfindelsen har til formål at angive et apparat, som med en enkel udformning er velegnet til den pågældende art af rensning, og ved hvis hjælp rensningen kan udføres både effektivt og skånsomt og i øvrigt på fordelagtig måde i flere andre henseender, eksempelvis uden brug af destillations-35 udstyr.The invention has for its object to provide an apparatus which, in a simple design, is suitable for the particular type of purification, and by which the purification can be carried out both efficiently and gently and otherwise advantageously in several other respects, for example without the use of distillation equipment.

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Apparatet ifølge opfindelsen er ejendommelig ved de træk/ som er angivet i den kendetegnende del af krav 1. De angivne skovlvinger kan slynge rensevæsken mod emnerne over et stort område i en bred og passende kraftig strøm til hurtig og effektiv/ men dog skånsom rensning af emnerne/ og apparatet 3 ·.. behøver ikke at have andre bevægelige organer end disse skovlvinger på stationært anbragte rotorer. Ved påslyng-ningen af de brede strømme er man uafhængig af at skulle føre rensevæsken gennem snævre dyser, idet væsken uanset 10 dens grad af tilsmudsning let kan kastes mod emnet ved hjælp af skovlvingerne, og apparatet udsættes derfor ikke for tilstopninger, vingerne kan arbejde i ringe afstand fra støtteindretningen, således at der ikke kræves noget stort frit rum omkring emnerne.The apparatus according to the invention is characterized by the features stated in the characterizing part of claim 1. The indicated vanes can flush the cleaning fluid against the workpieces over a large area in a wide and suitably powerful stream for quick and efficient / yet gentle cleaning of the workpieces. / and the apparatus 3 · .. need not have movable means other than these vanes on stationary rotors. In the winding of the broad currents, it is independent of having to pass the cleaning fluid through narrow nozzles, the liquid, regardless of its degree of soiling, can easily be thrown against the workpiece by means of the vane blades, and therefore the apparatus is not subjected to clogging, the wings can work in a small distance from the support device so that no large free space around the blanks is required.

15 Visse emner, f.eks. netop de omtalte serigrafirammer, kan dog vanskeligt renses tilfredsstillende alene ved påsprøjt-ning af rensevæske, idet en for total rensning tilstrækkelig strålekraft kunne beskadige emnet. Det er derfor ønske-ligt at tilføje en mekanisk bearbejdning af emneoverfladen, * 20 således som det opnås ved brug af de kendte roterende børster. En sådan bearbejdning kan netop ved opfindelsen opnås på en yderligere effektiv og hensigtsmæssig måde, nemlig ved brug af makropartikler i rensevæsken, f.eks. små-kugler af ekspanderet polystyrol, som føres til skovlvinger-25 ne blot ved at være lejret i den tilbragte rensevæske. Ved den turbulente indkastning af -væsken og partiklerne mod emneoverfladen vil partiklerne både slå og gnide nænsomt, men rensningsmæssigt effektivt mod emneoverfladen.15 Certain topics, e.g. however, just the aforementioned screen printing frames can be difficult to clean satisfactorily only by spraying cleaning fluid, as a sufficient radiant power could damage the workpiece for total cleaning. It is therefore desirable to add a mechanical machining of the workpiece surface, * 20 as obtained by using the known rotating brushes. Such processing can be achieved precisely in the invention in a further efficient and convenient way, namely by using macroparticles in the cleaning liquid, e.g. expanded polystyrene small spheres which are fed to the vane blades simply by being stored in the spent cleaning fluid. By the turbulent throwing of the liquid and particles towards the workpiece surface, the particles will both strike and rub gently but purely effectively against the workpiece surface.

ΛΛ

Apparatet behøver ikke at være forsynet med et destillations-30 aggregat da den tilsmudsede rensevæske normalt vil kunne renses blot ved at henstå i den nævnte separationstank nogle timer efter dagligt brug.The apparatus need not be provided with a distillation unit as the soiled cleaning fluid will normally be able to be purified simply by standing in the said separation tank a few hours after daily use.

I krav 2 er angivet en foretrukket udførelsesform, hvor 3Claim 2 shows a preferred embodiment, wherein 3

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rensevæsken blot kan indfyldes i passende mængde i det nævnte kar, hvorved det er let opnåeligt, at skovlvingerne på alle rotorerne kan arbejde umiddelbart i eller under væskeoverfladen, hvor også de lette makropartikler kan samle 5 sig, blot ved at være flydende i væsken.the cleaning fluid can only be filled in a suitable amount in said vessel, whereby it is easily obtainable that the vane blades on all the rotors can work immediately in or below the liquid surface, where also the light macroparticles can collect, simply by being liquid in the liquid.

Da der normalt ikke vil være behov for noget særligt tykt væskelag, kan der jfr. krav 3 gøres brug af en tilsvarende lille separationstank af enkel indretning.Since no particularly thick liquid layer will normally be needed, cf. Claim 3 uses a correspondingly small separation tank of simple device.

Jfr. det foranstående bør eller kan apparatet i operations-10 klar tilstand være udrustet som angivet i krav 4, dvs. uden at skulle sluttes til eksterne forbindelser for andet end strøm til rotorerne.Cf.. the foregoing should or can the apparatus in operable state be equipped as claimed in claim 4, i. without having to connect to external connections for anything other than power to the rotors.

Det skal bemærkes, at det indenfor apparattypen "opvaskemaskiner" længe har været kendt at gøre brug af et opstrålen-15 de turbine- eller skovlhjul i bunden af det benyttede opvaskerum, men formålet er her at skabe en kraftig opstråling, der dels ikke skal være specielt skånsom og dels skal nå et godt stykke op i rummet for passage af indtil fler bærelag for opvaskegodset, der for flademners vedkommende er 20 beregnet til at placeres på højkant i dertil indrettede U holdere. Det er ved opvaskemaskiner ikke benyttet at gøre brug af en i forhold til højden udbredt vandflade, hvorfra vandet fra flere skovlrotorer slynges op i brede strømme mod et vandret bæregitter til liggende understøtning af 25 flade emner.It should be noted that within the apparatus type "dishwashers" it has long been known to make use of a radiated turbine or impeller at the bottom of the used dishwasher, but the purpose here is to create a powerful radiation which, in part, should not be especially gentle and partly must reach a good distance into the room for passage of up to several carriers for the dishwasher, which for flatmen 20 is intended to be placed upright in the U holders arranged therefor. It is not used in dishwashers to use a water surface which is widespread in relation to the height, from which the water from several vane rotors is poured into wide streams against a horizontal support grid for horizontal support of 25 flat items.

Opfindelsen forklares i det følgende nærmere under henvisning til tegningen, hvor fig. 1 er et perspektivisk billede af et apparat ifølge opfindelsen, medens 30 fig. 2 er et snitbillede af et tilsvarende, omend let ændretThe invention will now be explained in more detail with reference to the drawing, in which 1 is a perspective view of an apparatus according to the invention, while FIG. 2 is a sectional view of a similar, albeit slightly altered

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4 apparat, vist med påfyldt rensevæske.4 appliance, shown with refilled liquid.

Apparatet ifølge opfindelsen omfatter et fladt/ øvre kar 2, understøttet af ben 4 og nær sin overkant forsynet med en vandret bærerist 6, hvorpå man kan anbringe den eller de 5 genstande, som skal renses, eksempelvis en serigrafiramme samt (i en ikke vist, særlig bærekurv) diverse serigrafiværktøjer, såsom farverulle og rakel. I bunden af karret 2 er anordnet et antal rotorer 8 med vandret udragende skovlvinger 10, roterende om lodrette aksler 12, der jfr. fig. 2 er nedført gennem ophøjede partier 14 af karbunden, der er betegnet med 16. Akslerne 12 er nederst forsynet med kædehjul 18, som drives af en fælles kæde 20 fra en motor 22. Karret er tildækket af et punkteret vist låg 24, hvis forreste del kan oplukkes for ind- og udtagning af de emner, der skal renses. Fortrinsvis findes der ikke viste organer til udløséiig fastholdelse af låget i skråt åben stilling, der tillader ind- og udtagning af genstandene uden noget betydende udslip af dampe fra karrets indhold.The apparatus according to the invention comprises a flat / upper vessel 2, supported by legs 4 and near its upper end provided with a horizontal support grid 6, on which to place the object (s) to be cleaned, for example a silk-screen frame and (in a not shown, special carrier basket) various screen printing tools, such as color roller and rakel. At the bottom of the tub 2 are arranged a plurality of rotors 8 with horizontal projecting vanes 10, rotating about vertical shafts 12, cf. FIG. 2 is lowered through raised portions 14 of the vessel bottom, indicated by 16. The shafts 12 are at the bottom provided with sprockets 18, which are driven by a common chain 20 from a motor 22. The tub is covered by a punctured lid lid 24, the front of which is can be unlocked for taking and removing the items to be cleaned. Preferably, no means is shown for releasably holding the lid in an obliquely open position, which allows the objects to be taken in and removed without any significant release of vapors from the contents of the vessel.

Nede under karret 2 er anbrgt en tank 26 for rensevæske, 20 der gennem en pumpe P og et rør 28 kan pumpes op i karret 2. Dette har et bundudløb 30, der gennem en afspærringsventil 32 med betjeningsgreb 34 (fig. 1) og gennem et rør 36 er forbundet med den øvre ende af tanken 26. I bunden af tanken 26 findes en optagelig slambakke 38, idet tanken er 25 lukket med et aftageligt låg 40. Ydermere kan der på ikke vist måde findes en overløbsforbindelse fra karret 2 til tanken 26.Below the vessel 2 is a tank 26 for cleaning liquid 20 which can be pumped up into the vessel 2 through a pump P and a tube 2. This has a bottom outlet 30 which through a shut-off valve 32 with control handle 34 (Fig. 1) and through a tube 36 is connected to the upper end of the tank 26. At the bottom of the tank 26 is a removable sludge tray 38, the tank 25 being closed with a removable lid 40. Furthermore, an overflow connection can not be found from the vessel 2 to the tank. 26th

Når rensemaskinen skal bruges, pumpes stort set hele mængden i tanken 26 op i karret 2, hvor væskeoverfladen er 30 beliggende i niveau med eller en smule oven over skovlvingerne 10. Når motoren 22 startes, vil skovlvingerne slynge væsken op imod emnet eller emnerne på risten 6, og for så vidt denne ikke er helt dækket, hvad den fortrinsvis 5When the cleaning machine is to be used, virtually all of the amount in the tank 26 is pumped up into the vessel 2, where the liquid surface is 30 level or slightly above the vane blades 10. When the motor 22 is started, the vane blades will flush the liquid up against the item or items on the grate. 6, and insofar as this is not completely covered, preferably 5

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ikke bør være/ vil der også slynges væske op i rummet lige under låget 24, hvorved der også kan udøves en vis rense-virkning på emneoversiden ved den kraftige turbulens i den opslyngede væske. Den side af en serigrafiramme, som har 5 vendt mod trykfladen under trykningen, vil normalt ikke behøve nogen kraftig rensning, og når denne side vendes opad på risten 6, vil rammen normalt kunne renses tilfredsstillende uden at vendes i rensemaskinen.liquid should not be / will also be thrown into the space just below the lid 24, whereby some cleaning effect can also be exerted on the workpiece surface by the severe turbulence in the swollen liquid. The side of a screen printing frame which has faced the printing surface during printing will not normally require any heavy cleaning, and when this side is turned upwards on the grate 6, the frame will normally be satisfactorily cleaned without turning in the cleaning machine.

Som nævnt er det et vigtigt træk ved opfindelsen, at der 10 kan benyttes rensevæsker, som er tilsat et kvantum lette makropartikler, der i fig. 2 er vist flydende i væskeoverfladen og er betegnet med 42. I en foretrukket udførelse benyttes kugler af ekspanderet polystyrol, eksempelvis i 3 en mængde på knap 3 kg. pr. m rensevæske. Kuglerne kan 15 have en diameter på f.eks. 5-25 mm, og til rensning af serigraf irammer har det vist sig fordelagtigt at benytte lige store mængder kugler med en diameter på henholdsvis 10 og 20 mm; de store kugler synes at give den bedste rense-virkning, men de mindre kugler er ønskelige af hensyn til 20 rensningen i indvendige hjørner. Kuglerne giver en skånsom, men dog så effektiv rensevirkning, at rensningen af en almindelig serigrafiramme kan udføres på ganske få minutter, normalt 2-6 min., medens normen ved de kendte, langt dyrere rensemaskiner er 10-20 min.As mentioned, it is an important feature of the invention that cleaning liquids can be used which have a quantity of lightweight macroparticles added in FIG. 2 is shown floating in the liquid surface and is designated 42. In a preferred embodiment, expanded polystyrene balls are used, for example in 3 an amount of just under 3 kg. per. m of cleaning fluid. The balls may have a diameter of e.g. 5-25 mm, and for cleaning silk screen frames it has proved advantageous to use equal amounts of spheres having a diameter of 10 and 20 mm respectively; The large spheres appear to provide the best cleaning effect, but the smaller spheres are desirable for the purification of interior corners. The spheres provide a gentle, yet so effective, cleaning effect that the cleaning of a regular silk screen can be done in a few minutes, usually 2-6 minutes, while the norm for the known, much more expensive cleaning machines is 10-20 minutes.

25 Den opslyngede væske med tilhørende rensekugler falder direkte ned i karrret igen, og under brugen er der således ingen cirkulation gennem rør, dyser eller filtre, men kun i selve karrummet, der i øvrigt kan udføres meget fladt, idet afstanden fra skovlvingerne 10 op til oversiden af bæ-30 reristen 6 ikke behøver at være mere end 5-10 cm. Dette betyder, at væskefordampningen kan holdes på et minimum.25 The swollen liquid and associated cleaning balls fall directly into the tub again, and during use there is thus no circulation through pipes, nozzles or filters, but only in the tub itself, which can otherwise be very flat, the distance from the vane blades 10 up to the top of the carrier 6 need not be more than 5-10 cm. This means that the liquid evaporation can be kept to a minimum.

Når main er færdig med at bruge apparatet, åbnes ventilen 32, hvorved væsken og de fleste af kuglerne løber ned iWhen the main is finished using the appliance, valve 32 opens, whereby the liquid and most of the balls run into the

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6 tanken 26, hvor der i løbet af nogle timer/ f.eks. i nattens løb, vil ske en vis klaring af væsken ved slamudfældning i bundbakken 38. Efter behov kan så bakken optages og renses.6 the tank 26, where in a few hours / e.g. during the night, some liquid will be cleared by sludge precipitation in the bottom tray 38. If necessary, the tray can be taken up and cleaned.

5 Opfindelsen er ikke begrænset til den viste udførelse/ idet det f.eks. vil være muligt at udforme apparatet som en gennemløb s tunnel, ligesom påslyngningen af væske og kugler ikke nødvendigvis skal ske opad fra et bad, men eksempelvis udad fra et faldende væsketæppe. Slamtanken 26 kan være an-10 bragt på hjul og være forbundet til karret 2 gennem bøjelige slanger, hvorved tanken er udtrækkelig for let optagning af bundbakken. Tanken kan i øvrigt være placeret efter ønske, endog ovenover karret 2 ved egnet anbringelse af pumpen og nedløbsventilen.The invention is not limited to the embodiment shown, in that e.g. It will be possible to design the apparatus as a passageway tunnel, just as the pouring of liquid and balls must not necessarily take place upwards from a bath, but for example outwards from a falling liquid carpet. The slurry tank 26 may be mounted on wheels and connected to the vessel 2 through flexible hoses, the tank being retractable for easy pick-up of the bottom tray. Moreover, the tank can be positioned as desired, even above the vessel 2 by suitable placement of the pump and the drain valve.

Claims

7 DK 155922 B PATENT REQUIREMENTS:

Apparatus for the gentle cleaning of large flat items, such as screen frames, comprising a flat support device for the articles and means for spraying cleaning liquid against them, characterized in that on one side 5 of the support device there is a shielded flat space for accommodating and on the other side of the support device and at a short distance therefrom there is a space for receiving cleaning fluid with a free liquid surface, the support device extending substantially parallel to the liquid surface and a plurality of rotor blades (8) being arranged on parallel rotor axes in such a way that their vane blades (10) rotate in a common plane in said free liquid surface or immediately below or within it to produce wide-area liquid spraying against the workpiece surface from the nearby liquid surface thereof which vanes are arranged so freely or unshielded that the liquid can be fed into this liquid macroparticle, The collection of cleaning fluid is associated with a separation tank for the used cleaning fluid.

Apparatus according to claim 1, characterized in that it consists of a lid-covered flat vessel (2) for accommodating a quantity of cleaning liquid to a predetermined level height, a spacer (6) spaced above it for supporting the object (s) which are to be cleaned, and approximately at said level height, motor-driven rotors (8) with <horizontal vane blades (10) rotating such that on Sport shafts (12) they flush cleaning fluid upwards towards the support grid.

Apparatus according to claim 2, characterized in that the vessel (2) is conduit-connected to the separation tank 30 (26) by means of pump and valve means in such a way that the entire amount of the cleaning fluid can be transferred back and forth between the vessel and the tank where the tank is provided with an absorbent bottom tray (38).

Apparatus according to any one of claims 1-3 / characterized in that it contains the required quantity of cleaning liquid and in connection therewith a quantity of lightweight 5 macroparticles, preferably balls (40) of expanded polystyrene.