DK169866B1

DK169866B1 - Method and apparatus for removing loose fibers and other particles from a mineral wool surface

Info

Publication number: DK169866B1
Application number: DK133089A
Authority: DK
Inventors: Gunnar Hartung
Original assignee: Rockwool Ab
Priority date: 1988-03-31
Filing date: 1989-03-17
Publication date: 1995-03-20
Also published as: FI90832C; SE469266B; NO173534B; NO891311L; NO891311D0; SE8801203L; DK133089A; NO173534C; SE8801203D0; FI891455A; DK133089D0; FI891455A0; FI90832B

Description

DK 169866 B1DK 169866 B1

Den foreliggende opfindelse vedrører en fremgangsmåde til fjernelse af løse fibre og andre partikler fra en mineraluldsoverflade/ der bevæger sig forbi en sugespalte, som suger luft ved mineraluldsoverfladen, på en sådan måde, at løse 5 fibre og andre partikler trækkes med luften ind i sugespalten, idet fjernelsen af fibre og partikler fremmes ved, at mineraluldsoverfladen udsættes for en mekanisk bearbejdning i forbindelse med sugespaltens påvirkning inden for det område, som dækkes af sugespalten.The present invention relates to a method for removing loose fibers and other particles from a mineral wool surface / moving past a suction gap which sucks air at the mineral wool surface in such a way that loose fibers and other particles are drawn with the air into the suction gap. the removal of fibers and particles is facilitated by exposing the mineral wool surface to a mechanical machining in connection with the action of the suction gap within the area covered by the suction gap.

10 Ved håndtering af mineraluldsprodukter opstår der større eller mindre mængder støv. Støvet indeholder bl.a. fibre. Der eksisterer generelt i samfundet en stræben mod en mindskelse af personers udsættelse eller eksponering for støv, ikke mindst fibrøst støv. Den foreliggende opfindelse har til 15 formål at løse denne opgave.10 When handling mineral wool products, larger or smaller amounts of dust are produced. The dust contains, inter alia, fibers. There is a general tendency in society to reduce people's exposure or exposure to dust, not least fibrous dust. The present invention has the object of solving this problem.

Bag opfindelsen ligger et studium af de mekanismer, der ligger bag støvafgivelse, samt de mekanismer, som kan bruges til at hindre afgivelse af støv. Dette studium har vist, at luftbåret støv, der opstår ved håndtering af mineraluld, i 20 vid udstrækning indeholder tynde og korte fibre. Studierne har også vist, at de luftbårne fibre og andre partikler, som afgives, stammer fra mineraluldsprodukternes overflade.Behind the invention is a study of the mechanisms underlying dust release, as well as the mechanisms that can be used to prevent the release of dust. This study has shown that airborne dust arising from the handling of mineral wool contains, to a large extent, thin and short fibers. The studies have also shown that the airborne fibers and other particles emitted originate from the surface of the mineral wool products.

Man kan bestemme tre mekanismer, der hver for sig og i kombination kan holde en fiber tilbage i et mineraluldsprodukt og 25 hindre, at fibrene bliver luftbårne. De tre mekanismer er: binding, i vedhæftning og mekanisk låsning.Three mechanisms can be determined which, individually and in combination, can retain a fiber in a mineral wool product and prevent the fibers from being airborne. The three mechanisms are: bonding, in attachment and mechanical locking.

Bindingen frembringes ved hjælp af et bindemiddel. Bindemid-30 let udgøres igen oftest af en hærdet plast, der i små dråber er fordelt i mineraluldsprodukterne. I den udstrækning sådanne bindemiddelsprodukter holder en fiber tilbage, forhindres det, at fiberen bliver båret med i luften. Vedhæftningen er en mindre kraftig binding. Vedhæftningen kan igen tilveje- 2 DK 169866 B1 bringes ved hjælp af en støvbindingsolie, som i et tyndt lag dækker store dele af fiberoverfladerne. To fibre, som er i kontakt med hinanden, og af hvilke i det mindste den ene har * en oliefilm på overfladen, hæfter fast til hinanden, og denne 5 vedhæftning er som regel tilstrækkelig til at forhindre, at fibrene kan føres med af luften og blive luftbårne.The bond is produced by a binder. The binder is again most often constituted by a hardened plastic which is distributed in small droplets in the mineral wool products. To the extent that such binder products retain a fiber, the fiber is prevented from being carried in the air. The adhesion is a less strong bond. The adhesion can again be provided by a dust-bonding oil which, in a thin layer, covers large parts of the fiber surfaces. Two fibers which are in contact with each other, of which at least one has * an oil film on the surface, adhere to each other, and this attachment is usually sufficient to prevent the fibers from being carried by the air and become airborne.

Undersøgelser har imidlertid også vist, at en anden type vedhæftning, nemlig en elektrostatisk vedhæftning, spiller en betydelig rolle. Ved processen til fremstilling af mineral-10 uldsprodukter indgår et såkaldt hærdningstrin, ved hvilket produktet og dets bindemiddel opvarmes til ca. 200°C. Ved denne proces fikseres bindemidlet slutteligt. Ved hærdnings-processen sker der imidlertid også en fuldstændig udtørring, og når hærdningsprocessen er kombineret med en kraftig gas-15 gennemstrømning gennem produktet, kan fibrene oplades elektrostatisk. Ved den videre til- eller udskæring, emballering etc. bevares denne statiske opladning, og sådanne opladede fibre har en tilbøjelighed til at blive tilbage i produktet.However, studies have also shown that another type of attachment, namely an electrostatic attachment, plays a significant role. The process for producing mineral wool products includes a so-called curing step, at which the product and its binder are heated to approx. 200 ° C. In this process, the binder is finally fixed. However, in the curing process, complete drying also occurs, and when the curing process is combined with a strong gas flow through the product, the fibers can be charged electrostatically. Upon further cutting or packaging, this static charge is retained and such charged fibers tend to remain in the product.

Under lagring og transport sker der imidlertid en udladning, 20 og ved denne udladning kan de således tidligere elektrostatisk bundne fibre blive ført med i luften.During storage and transport, however, a discharge takes place, 20 and in this discharge the previously electrostatically bonded fibers can be carried into the air.

Den tredje mekanisme til tilbageholdelse af fibre i mineraluldsmassen er en mekanisk låsning. En fiber, der er tilstrækkelig lang, kommer i kontakt med et stort antal andre fibre, 25 hvorved den ved direkte friktion holdes tilbage og forhindres i at blive ført bort i og med luften.The third mechanism for retaining fibers in the mineral wool stock is a mechanical lock. A fiber of sufficient length comes into contact with a large number of other fibers, whereby it is retained by direct friction and prevented from being carried away with the air.

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Undersøgelser har også vist, at visse fibre er så utilstrækkeligt bundne eller slet ikke bundet til produktet, at de med lethed kan suges bort fra produktet ved, at produktet føres 30 forbi et sugemundstykke eller sugespalte med tilstrækkelig virkning. Andre fibre og partikler er så fast bundet, at de ' under normale forhold næppe overhovedet kan frigøres fra produktet. Mellem disse to typer af fibre og partikler ligger i de fibre og partikler, der vitterlig ikke med lethed kan 35 suges bort fra produktet, men som dog, specielt efter at 3 DK 169866 B1 elektrostatiske kræfter er forsvundet, kan føres bort i og med luften, når produktet håndteres og monteres.Studies have also shown that certain fibers are so insufficiently bonded or not bonded to the product that they can be easily sucked away from the product by passing the product past a suction nozzle or suction slot with sufficient effect. Other fibers and particles are so tightly bound that under normal conditions they can hardly be released from the product at all. Between these two types of fibers and particles lie in the fibers and particles which, admittedly, cannot easily be sucked away from the product, but which, especially after the electrostatic forces have disappeared, can be carried away and with the air , when handling and mounting the product.

Den foreliggende opfindelse har til formål at forbedre mulighederne for at bortsuge endog sådanne partikler og fibre, der 5 ved senere behandlings trin kan blive luftbårne, men som ikke med lethed lader sig fjerne fra produktet ved hjælp af suge-spalter placeret ved mineraluldsoverfladen.The present invention aims to improve the ability to even absorb such particles and fibers which, at later stages of treatment, can become airborne, but which cannot easily be removed from the product by suction slots located at the mineral wool surface.

Ovennævnte mål opnås med en fremgangsmåde af den indledningsvis angivne type, som ifølge opfindelsen er kendetegnet ved, 10 at den mekaniske bearbejdning af mineraluldsoverfladen sker ved, at mineraluldsbanens overflade eller overflader i forbindelse med bortsugningen udsættes for en oscillerende bevægelse vinkelret på fladen.The above-mentioned objectives are achieved by a method of the type mentioned in the introduction, which according to the invention is characterized in that the mechanical processing of the mineral wool surface is effected by exposing the surface of the mineral wool web or surfaces in connection with the suction to an oscillating movement perpendicular to the surface.

Den foreliggende opfindelse angår endvidere et apparat til 15 udøvelse af fremgangsmåden ifølge opfindelsen og til fjernelse af fibre og andre partikler fra en mineraluldsoverflade, der bevæger sig forbi en sugespalte, som suger luft ved mineraluldsoverfladen, på en sådan måde, at løse fibre og andre partikler trækkes med luften ind i sugespalten, hvilket 20 apparat har organer til tilvejebringelse af en mekanisk bearbejdning af mineraluldsoverfladen eller -overfladerne samtidigt med og i alt væsentligt på samme sted, hvor mineraluldsoverfladen udsættes for sugepåvirkning, hvilket apparat ifølge opfindelsen er kendetegnet ved, at de mekaniske 25 bearbejdningsmidler udgøres af en indretning til udsættelse af mineraluldsbanens overflade eller overflader for en oscil- ; lerende bevægelse vinkelret på overfladen.The present invention further relates to an apparatus for practicing the method of the invention and for removing fibers and other particles from a mineral wool surface moving past a suction slot which sucks air at the mineral wool surface in such a way as to dissolve fibers and other particles. being drawn with the air into the suction slot, which apparatus has means for providing mechanical machining of the mineral wool surface or surfaces simultaneously with and substantially at the same location where the mineral wool surface is subjected to suction, which apparatus according to the invention is characterized in that the mechanical 25 processing means comprise a device for exposing the surface of the mineral wool web or surfaces to an oscillator; learning motion perpendicular to the surface.

I en foretrukken udførelsesform for fremgangsmåden ifølge opfindelsen kan den oscillerende bevægelse tilvejebringes ved 30 at mineraluldsbanen udsættes for vibrationer. Ifølge en anden foretrukken udførelsesform kan den oscillerende bevægelse tilvejebringes ved at en perforeret anslagsflade bringes til at slå mod mineraluldsoverfladen flere gange. Det er hensigtsmæssigt, at bearbejdningen med den perforerede anslags- 4 DK 169866 B1 flade sker på begge sider af mineraluldsbanen og i et for-holdsvist hurtigt tempo, fx på en sådan måde, så at anslags-pladen slås mod hvert punkt af mineraluldsoverfladen mindst tre gange under bevægelsen forbi sugespalten. * 5 Bearbejdningen sker altså ved en mekanisk bearbejdning svarende til piskning, hvilket har en frigørende virkning på de utilstrækkeligt bundne fibre og andre partikler. Bearbejdningen med den perforerede anslagsplade bør foregå på en sådan måde, at der frembringes en vis deformation af mineral-10 uldsoverfladen ved pladens anslag, så at overfladen virkelig sættes i bevægelse, og så at samme del af mineraluldsoverfladen rammes flere gange af pladen. Man kan også tilvejebringe flere plader eller frembringe serier af slag, så at overfladen bliver gennembearbejdet. Man vil umiddelbart forstå, 15 at opfindelsen lettest udøves i forbindelse med plane flader, dvs. mineraluldsbanens over- eller underside. Det er bedst at udføre bearbejdningen på begge disse sider eller flader.In a preferred embodiment of the method according to the invention, the oscillating motion can be provided by subjecting the mineral wool web to vibration. According to another preferred embodiment, the oscillating movement can be provided by causing a perforated impact surface to strike the mineral wool surface several times. It is convenient that machining with the perforated impact surface occurs on both sides of the mineral wool web and at a relatively fast pace, for example in such a way that the impact plate is struck at each point of the mineral wool surface for at least three times during the movement past the suction gap. * 5 Thus the machining is done by a mechanical machining similar to whipping, which has a releasing effect on the insufficiently bonded fibers and other particles. The processing with the perforated impact plate should be carried out in such a way as to cause some deformation of the mineral-wool surface at the impact of the plate so that the surface is really moved and so that the same part of the mineral wool surface is hit several times by the plate. You can also provide multiple plates or produce series of strokes so that the surface is worked through. It will be understood immediately that the invention is most easily practiced in connection with planar surfaces, i.e. the upper or lower surface of the mineral wool. It is best to do the machining on both these sides or surfaces.

Uanset hvor effektivt bearbejdningen og bortsugningen udføres, vil der altid findes fibre og partikler, der lige 20 netop undgår at blive frigjort og suget bort. Der er altid en risiko for, at disse fibre frigøres delvis og senere bliver ført bort i og med luften ved den videre behandling af produktet. Dette kan på effektiv måde forhindres ved, at den bearbejdede flade behandles med et støvbindingsmiddel.Regardless of how efficiently the machining and extraction is performed, there will always be fibers and particles that just 20 just avoid being released and sucked away. There is always a risk of these fibers being partially released and later carried away with the air during the further processing of the product. This can be effectively prevented by treating the machined surface with a dust binding agent.

25 Opfindelsen vil i det følgende blive nærmere forklaret under henvisning til tegningen, der viser længdesnit gennem en indretning eller et apparat ifølge opfindelsen til fjernelse af støv fra en mineraluldsbane.The invention will be explained in more detail below with reference to the drawing, which shows longitudinal sections through a device or apparatus according to the invention for removing dust from a mineral wool web.

I fig. 1 er vist, hvorledes en mineraluldsbane 1 er i be-30 vægelse i retningen efter en pil 2. Mineraluldsbanen l under- \ støttes således af et antal ruller 3. Ovenfor mineralulds-banen l's overside 4 findes en sugespalte 5, der står i forbindelse med en sugeledning 6. I forbindelse med sugespal- ^ ten 5 findes en rulle 7, ved hvis hjælp sugespalten 5's 5 DK 169866 B1 placering i forhold til en mineraluldsbane l's overside 4 bestemmes. I sugespalten 5's forreste kant 8 er placeret en blæsespalte 9. Blæsespalten 9 er forbundet med en blæser 10, og fra blæsespalten 9 afgives en luftstrøm, der er symboli-5 seret med en pil 11, og som rammer mineraluldsbanen l's overside 4 og løsner partikler, der kun i utilstrækkelig grad eller slet ikke er fastgjort til mineraluldsmassen. Disse frigjorte partikler suges af en luftstrøm 12 ind i sugeledningen 6. Virkningen forstærkes af den luftstrøm 13, der 10 strømmer ind gennem den mellem mineraluldsbanen 4's overside og suge- eller blæsespalterne 5 og 9 dannede åbning. Ved mineraluldsbanens underside 14 er placeret en tilsvarende konstruktion. I fig. 1 er denne betegnet med henvisningsbetegnelserne 5'-13' svarende til de tidligere omhandlede 15 henvisningsbetegnelser 5-13. Efter at mineraluldsfladen eller -fladerne er blevet bearbejdet, behandles fladerne hensigtsmæssigt med et støvbindende middel af i og for sig kendt type.In FIG. 1 is shown how a mineral wool web 1 moves in the direction of an arrow 2. Thus, the mineral wool web 1 is supported by a number of rollers 3. Above the upper side 4 of the mineral wool web is a suction slot 5 which is connected. with a suction line 6. In connection with the suction slot 5 there is a roller 7, by means of which the position of the suction slot 5 is determined in relation to the upper side 4 of a mineral wool web 1. In the front edge 8 of the suction slot 5 is located a blow slot 9. The blow slot 9 is connected to a blower 10, and from the blow slot 9 an air flow is symbolized by an arrow 11, which impacts the upper surface 4 of the mineral wool web 1 and detaches particles. which is only insufficiently or not at all attached to the mineral wool mass. These released particles are sucked by an air stream 12 into the suction line 6. The effect is enhanced by the air flow 13 which flows through the opening formed between the upper surface of the mineral wool web 4 and the suction or blow gaps 5 and 9. A similar construction is located at the underside 14 of the mineral wool web. In FIG. 1, it is designated by reference numerals 5'-13 'corresponding to the previously referenced 15 reference numerals 5-13. After the mineral wool surface (s) has been processed, the surfaces are suitably treated with a dust-binding agent of the type known per se.

I fig. 2 er vist en tilsvarende konstruktion. I denne er der 20 placeret en forholdsvis bred sugespalte 15, som er forbundet til en sugeledning 16. Sugespalten 15 er placeret i en sådan afstand fra mineraluldsbanens overside 4, at der dannes forholdsvis smalle åbninger 17 og 18. Gennem disse suges en luftstrøm henholdsvis 19 og 20 ind i sugespalten 15. I suge-25 spalten 15 er der placeret en blæser 21, fra hvilken der strømmer luft ned mod mineraluldsbanens overside 4 gennem en ledning 22 og en spalte 23. En derved frembragt luftstråle 24 bearbejder mineraluldsfladen og river utilstrækkeligt bundne partikler og fibre løs. En tilsvarende konstruktion, til 30 hvilken henvisningsbetegnelserne 15'-24' hører, er placeret ved mineraluldsbanens underside 14.In FIG. 2 shows a similar construction. Therein 20 is placed a relatively wide suction gap 15 which is connected to a suction line 16. The suction gap 15 is located at such a distance from the top surface 4 of the mineral wool that relatively narrow openings 17 and 18. are formed. and 20 into the suction slot 15. A suction slot 15 is provided with a blower 21 from which air flows down towards the upper surface of the mineral wool web 4 through a conduit 22 and a slot 23. An air jet 24 produced thereby processes the mineral wool surface and tears insufficiently bonded. particles and fibers loose. A similar structure, to which reference numerals 15'-24 'belong, is located at the underside 14 of the mineral wool web.

I fig. 3 er vist en mineraluldsbane l, der bevæger sig i pilen 2's retning understøttet af rullerne 3. Ved mineraluldsbanens l's overside 4 er placeret en sugespalte 5, der 35 holdes i en bestemt placering i forhold til mineraluldsbanens overside 4 ved hjælp af en rulle 7. Sugespalten 5 er for- DK 169866 B1 e bundet med en sugeledning 6, der foranlediger, at der suges ^ en luftstråle 13 ind gennem spalten 5. En anslagsplade 25 med en understøtningsstang 26 er placeret i en åbning 27 mellem mineraluldsbanens overside 4 og sugespaltens forlængede læbe 5 28. Understøtningsstangen 26 bevæger sig op og ned som an givet med en pil 29 drevet af en indretning, der ikke er vist i figuren. Denne indretning kan være en excentrik eller en pneumatisk styret impulsgiver. Pladen 25 bringes ved hjælp af denne indretning til at slå mod mineraluldsbanens overside 4 10 i forholdsvis hurtigt tempo, fx så at hvert punkt på mineraluldsbanen rammes mindst tre gange. Det derved frigjorte og ophvirvlede støv føres bort af luftstrømmen 13 og føres ind i > sugeledningen 6.In FIG. 3 is shown a mineral wool web 1 moving in the direction of arrow 2 supported by rollers 3. At the top 4 of the mineral wool web 1 is placed a suction slot 5 which is held in a certain position with respect to the top of the mineral wool web 4 by means of a roller 7. The suction slot 5 is connected with a suction line 6 which causes an air jet 13 to be sucked in through the slot 5. A stop plate 25 with a support rod 26 is located in an opening 27 between the upper surface 4 of the mineral wool web and the extension of the suction gap. lip 5 28. The support bar 26 moves up and down as indicated by an arrow 29 driven by a device not shown in the figure. This device may be an eccentric or a pneumatically controlled pulse generator. The plate 25 is caused by this device to strike against the upper surface 410 of the mineral wool web at a relatively fast pace, for example so that each point on the mineral wool web is hit at least three times. The dust thus released and swirled is carried away by the air flow 13 and introduced into the suction line 6.

Anslagspladen 25 er hensigtsmæssigt perforeret, så at partik-15 lerne kan frigøres fra mineraluldsfladen selv under selve anslaget.The abutment plate 25 is suitably perforated so that the particles can be released from the mineral wool surface even during the abutment itself.

Ved mineraluldsbanens underside 14 findes en tilsvarende indretning eller konstruktion, der er angivet med til henvisningsbetegnelserne 5-29 svarende henvisningsbetegnelser 20 5'-29'.At the underside 14 of the mineral wool web there is a corresponding device or structure indicated by reference numerals 5-29 corresponding to reference numerals 20 5'-29 '.

I fig. 4 er vist en mineraluldsbane 1, der bevæger sig i pilen 2's retning og understøttes af rullerne 3. Ved mineraluldsbanen 1's overside 4 er placeret en sugespalte 15, der står i forbindelse med en sugeledning 16. Sugespalten er 25 placeret på en sådan måde, at der mellem mineraluldsbanen l's overside 4 og sugespalten dannes forholdsvis smalle åbninger t 17 og 18, gennem hvilke der ind i sugespalten 15 suges luftstrømme henholdsvis 19 og 20. Inde i sugespalten er monteret en børste 30. Børsten 30 roterer i en retning, der er angivet 30 med en pil 31. Når børsten 30 roterer mod mineraluldsbanens bevægelsesretning, børster den løse fibre og partikler op fra mineraluldsbanen l. Disse løse fibre og partikler suges ind i sugeledningen 16 ved hjælp af luftstrømmene 19 og 20. Når børsten 30 børster løse fibre og partikler bort fra mineral-35 uldsbanen 1, vil en del af fibrene og partiklerne bliveIn FIG. 4 is shown a mineral wool web 1 moving in the direction of arrow 2 and supported by rollers 3. At the upper side 4 of mineral wool web 1 is located a suction slot 15 which is connected to a suction line 16. The suction gap 25 is positioned in such a way that relatively narrow openings t 17 and 18 are formed between the upper surface 4 of the mineral wool web 1 and the suction slot, through which air streams 19 and 20 respectively are sucked into the suction slot 15 and a brush 30. A brush 30 is mounted within the suction slot. 30 with an arrow 31. As the brush 30 rotates toward the direction of movement of the mineral wool web, it brushes loose fibers and particles from the mineral wool web 1. These loose fibers and particles are sucked into the suction line 16 by means of air streams 19 and 20. As the brush 30 brushes loose fibers and particles away from the mineral wool web 1, a portion of the fibers and particles will become

Claims

15 PATENT REQUIREMENTS

A method of removing fibers and other particles from a mineral wool surface moving past a suction slit (5, 5 ') which sucks air at the mineral wool surface (4, 14) in such a way as to dissolve fibers and other particles 20 being drawn in with the air into the suction slot (5, 5 '), facilitating the removal of fibers and particles by exposing the mineral wool surface (4, 14) to mechanical machining in connection with the action of the suction slot (5, 5') in the area; which is covered by the suction slot (5, 5 '), characterized in that the mechanical machining of the mineral wool surface takes place by exposing the surface of the mineral wool web or surfaces (4, 14) to an oscillating movement perpendicular to the surface.

Method according to claim 1, characterized in that the oscillating movement is provided by the vibration of the mineral wool web (1). DK 169866 Bl p

Method according to claim 1, characterized in that the oscillating movement is provided by causing a perforated abutment surface (25, 25 ') to strike against the mineral wool surface (4, 14) several times.

Method according to claim 3, characterized in that the processing with the perforated abutment surface (25, 25 ') takes place on both sides of the mineral wool web.

Method according to claim 3 or 4, characterized in that the abutment plate (25, 25 ') is brought into contact with the surface (4, 14) of the mineral wool web at a relatively rapid rate, for example in such a way that each point of the mineral wool surface ( 4, 14) during the movement past the suction slot (5, 5 ') at least three times by the impact plate (25, 25').

Apparatus for carrying out the method according to any of the preceding claims and for removing fibers and other particles from a mineral wool surface moving 20 past a suction slot (5, 5 ') which sucks air at the mineral wool surface (4, 14), in such a way that loose fibers and other particles are drawn with air into the suction slot (5, 5 '), which apparatus has means (25, 25') for providing a mechanical machining of the mineral wool surface or the 25 surfaces ( 4, 14) simultaneously with and substantially in the same place where the mineral wool surface is subjected to suction / influence, characterized in that the mechanical working means are a device for exposing the surface or surfaces (4, of the mineral wool web). 14) for an oscillating motion perpendicular to the surface. a

Apparatus according to claim 6, characterized in that the oscillating motion is provided by a stop plate (25, 25 ') which is movably mounted within the area where the suction slot (5, 5') operates, and adapted to strike with relatively rapid shocks to the surface of the mineral wool web (4, 14), for example in such a way that each point of the mineral wool surface (4, 14) is hit by the impact plate (25, 25 ') at least three times. ) as the web moves past the suction slot (5, 5 ').

Apparatus according to claim 7, characterized in that the abutment plate (25, 25 ') permits the flow of air, dust and particles.

Apparatus according to claim 7 or 8, characterized in that it comprises a suction slot (5, 5 ') with a movable abutment plate on both the upper side (4) and the underside (14) of the mineral wool web (1).

Apparatus according to claim 7, 8 or 9, 15, characterized in that it, in combination with the suction slot (5, 5 ') with the mechanical working stop plate (25, 25') comprises a mechanically working rotating brush.