WO2000067928A2 - Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques - Google Patents

Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques Download PDF

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Publication number
WO2000067928A2
WO2000067928A2 PCT/AT2000/000113 AT0000113W WO0067928A2 WO 2000067928 A2 WO2000067928 A2 WO 2000067928A2 AT 0000113 W AT0000113 W AT 0000113W WO 0067928 A2 WO0067928 A2 WO 0067928A2
Authority
WO
WIPO (PCT)
Prior art keywords
belt
particles
nozzle
steel
heating zone
Prior art date
Application number
PCT/AT2000/000113
Other languages
German (de)
English (en)
Other versions
WO2000067928A3 (fr
Inventor
Karl Narbeshuber
Original Assignee
Berndorf Band Gesmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Berndorf Band Gesmbh filed Critical Berndorf Band Gesmbh
Priority to AU47231/00A priority Critical patent/AU4723100A/en
Publication of WO2000067928A2 publication Critical patent/WO2000067928A2/fr
Publication of WO2000067928A3 publication Critical patent/WO2000067928A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
    • B24C3/085—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces the travelling workpieces being moved into different working positions during travelling
    • B24C3/086—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces the travelling workpieces being moved into different working positions during travelling whereby the workpieces are turned through a rotational arc of about 180 degrees
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2

Definitions

  • Device with at least one endless belt made of steel and method for the thermal application of plastic masses
  • the invention has a device with at least one endless belt made of steel, e.g. B. stainless steel, chromed steel, for receiving masses to be solidified and a method for the thermal loading of arranged on an endless steel strip plastic masses, which are guided with the steel strip through a heating zone, the subject.
  • steel e.g. B. stainless steel, chromed steel
  • Devices with endless steel strips are used for different purposes. It is known, for example, to feed food continuously through a heating tunnel and to carry out the baking process in the process.
  • the endless steel belts are soiled by the adhering baked goods and have to be cleaned temporarily. For this, the baking process is interrupted, the belt mechanically, e.g. B. cleaned with brushes.
  • Carbon layers of thermally decomposed material are exposed to a mixture of wheat starch and caustic soda and heat in the oven.
  • DE 41 03 577 AI discloses a device for cleaning objects, in particular semiconductor shells.
  • the cleaning is accomplished with a shot-peening device, the solid particles having a size between 2 ⁇ m and 5 ⁇ m and consisting of frozen water.
  • Crystals from water are described in DE 41 12 890 AI, the ice crystals being thrown against the surface to be cleaned with a water jet.
  • the ice crystals can either be added to the water as such or can only be formed in the jet using refrigerants.
  • the endless belts are subject to a special load during operation, so that they are subject to a change in shape which leads to the bowls of the belts.
  • EP 0 474 625 A1 provides for the strips to be aligned by acting on the same forces in the form of a large number of pulses.
  • the impulses can be exercised in a variety of ways.
  • One embodiment consists in that the shot peening nozzle is moved transversely to the longitudinal direction of the belt, so that all desired areas of the endless belt can be subjected to residual compressive stresses, thus removing the bowl from the belt.
  • One use of the endless belts is that a lower one
  • Band which carries the plastic masses to be formed, with a shaping taking place via an upper band, so that essentially plane-parallel products can be removed from the device.
  • the plastic masses are thermally acted on via the belts, whereby a solidification takes place.
  • the tapes can be made completely flat or structured. Due to the relatively high temperatures during the solidification of the plastic masses, e.g. B. melamine resins, and the structured formation of the forming endless steel strips, cleaning them is extremely expensive.
  • the relatively thick impurities on the steel strips with a thickness of 0.05 mm to 1.0 mm can be removed mechanically, for example with brushes, scrapers.
  • the object of the invention is to provide an apparatus and a method which have the disadvantages mentioned above avoids.
  • both local deformations such as changing the depressions and the like.
  • Another object of the present invention is to increase the production times of the systems and to produce standard products rather than rejects during cleaning.
  • the device according to the invention is based on a prior art as given by EP 0 474 625 AI.
  • the device according to the invention with at least one endless belt made of steel, for. B. stainless steel, chrome-plated steel, for receiving masses to be solidified, which is guided through at least one heating zone and a cooling zone and deflected at both ends with a deflection drum and optionally driven and at least one along a guide transverse to the belt longitudinal direction with a drive Movable nozzle, which is directed against the forming surface of the belt, the nozzle having a supply line for a fluid and for solid particles and a container for the solid particles, essentially consists in that a thermally insulated container for the solid particles is provided and the nozzle is directed onto the belt on the deflection drum, the surface of the belt in particular being structured.
  • Endless belts that are passed through a heating zone allow masses to be continuously thermally applied.
  • Such masses can be breads, biscuits, but also continuous masses, such as for melamine resin plates, for example.
  • the tapes used are either completely smooth or have a textured surface.
  • the repeated thermal loading of the surface of the endless steel strips not only solidifies the masses to be thermally loaded, but also carbonizes them on the strip. These carbon layers adhere particularly firmly to the surface and have so far been removed with chemical agents.
  • the best cleaning effect can be achieved by applying the frozen particles to the belt when it rests on the drum. Although it was expected that the tape would deform particularly severely if the- the same lies on the drum, such deformations could not be determined, moreover, however, a detachment of the adhering masses to be acted upon was found, which is supported, among other things, by the different thermal expansion coefficients of the belt and the adhering masses.
  • a further endless belt which is deflected at both ends with a deflection drum and possibly driven, is arranged above the endless belt, onto which, as is known per se, at least one nozzle along a guide transverse to the longitudinal direction of the belt over a
  • the axis of the nozzles forms an acute angle with the belt, so that the jet from the nozzle is directed opposite to the direction of movement of the belt, the layer remaining on the belt, in particular the carbonized layer, can be detached particularly easily since the layer not pressed against the tape, but detachment of the tape is effected.
  • a particularly large temperature difference can be achieved between the particles and the belt, so that a preferred detachment, in particular of the carbon layers, can be achieved.
  • the method according to the invention for the thermal application of plastic masses arranged on an endless steel strip, which are guided with the steel strip through a heating zone and optionally formed by an upper strip, the steel strip (s) being loaded with particles essentially consists of this that the steel band (s) after the thermal application of the plastic masses in the heating zone outside the heating zone additionally with a coolant in solid form, in particular
  • Solidified carbon dioxide particles are charged, the particles being projected onto the belt surface with a carrier gas.
  • the fact that for the steel strip outside the heating zone with a coolant can be applied, can be achieved that due to the different coefficients of thermal expansion and the temperature difference of the strip heated from the heating zone to the coolant, the inherently adhering deposits are blown off, with an additional detachment being caused by the carrier gas.
  • the projection of the solid particles onto the belt, which rests on the deflection drum causes a greater deformation
  • it was surprisingly found that such a deformation does not have to exist, obviously because of the dissolution of the solid particles by the action of heat , especially the hot band. There is no disruption to the production conditions.
  • the action of chemically reactive substances is avoided, so that the product produced is present without impairments.
  • the cooling process of the strip has no negative effect, so that no streaking or the like could be observed, which could be due to the temperature differences.
  • Contamination on the belt can be achieved.
  • the large thermal capacity of the belt with the drum does not have a surprising effect on the dissolution of the contaminants, but rather the solid particles become sufficient mass hurled against the surface of the steel strip, whereupon an accelerated aggregate transition into the liquid, in particular gaseous, occurs, so that the contaminants are detached particularly quickly.
  • the particles are projected onto the belt onto the deflection drum, which is arranged at the end of the heating zone in relation to the direction of movement of the belt, there is a particularly large temperature difference between the particles and the belt, which results in an extraordinarily large and rapid detachment of the contaminants is realized on the conveyor and the product to be produced is not affected by the particles due to the large temperature difference, while the detached impurities cannot be included in the product.
  • 1 shows a double belt system in a schematic representation
  • 2 shows a blasting system in a schematic representation
  • Fig. 4 is a nozzle
  • Fig. 5 is an insulated container for CO 2 particles.
  • the 1 has a machine bed 1 in which an upper endless belt 2 is tensioned by the deflection drums 6 and 6 'and a lower endless belt 3 by the deflection drums 7, 7' and in the same sense in Be kept in circulation.
  • the band has a width of 2.5 m and a length of 45 m.
  • the circulation speed is 6.0 m / min.
  • the tension applied to the strips is 70 N / mm 2 .
  • the strips are made of a stainless steel alloy with the following composition.
  • the belts are in the heating zone via rollers 4 and in the
  • the machine bed 1 is anchored in the foundation 9 via L-shaped supports 10.
  • the foundation also has a machine tunnel 8.
  • the product to be manufactured, a particle board 11, is made according to the Arrow x promoted from the system and is supported here by rollers 12.
  • a particle beam system 13 which has a pressure source 14.
  • the container 14 is in turn connected via lines 17 to the lances 18 which carry nozzles 19 at their ends. Solid carbon dioxide particles are transported from the container 16 into the lines 15.
  • a common line for a carrier gas, in particular carbon dioxide from the pressure source to the nozzles 19, can also be provided.
  • a device 20 for moving the nozzles is shown schematically.
  • the nozzle 19 is directed against the surface of the steel strip 3 in such a way that the angle ⁇ , which determines the path of the parallel bundled beam
  • the beam is oriented against the direction of movement.
  • a plurality of nozzles which are directed against a belt can also be provided.
  • FIG. 3 the device for moving one or more nozzles 19 is shown in more detail.
  • a holder 21 for the lances can be moved along a guide 22 transversely to the longitudinal extent of the bands 2 and 3 according to double arrow a.
  • the bracket 21 for the lances can be moved along a guide 22 transversely to the longitudinal extent of the bands 2 and 3 according to double arrow a.
  • an adjusting mechanism 34 is also provided, with which the distance of the nozzles 19 from the belt surface can be adjusted depending on the requirement. If necessary, this mechanism can also be used to set the angular position to the belt surface.
  • the movement of the holder 21 along the guide 22 is carried out via the motor 23 and a cable, not shown.
  • the nozzle 19 shown schematically in FIG. 4 has a feed line 25 for the CO 2 particles, whereas a feed line 24 is also provided for a carrier gas.
  • the feed line 25 opens tangentially into a cylinder space 26, so that the particles are additionally accelerated tangentially.
  • FIG. 5 shows a thermally insulated container 16 for the carbon dioxide particles.
  • This container has a lid 27 and a lower part 28, both of which are double-walled.
  • the cavity between the outer and inner wall can either be filled with thermal insulating material or also evacuated and optionally provided with an adsorbent.
  • the lid is seated on the lower part via a seal 29 and is held against it by screw clamps 30.
  • the screw conveyor 31 with the motor M is used to transport the particles to the line 15 to remove the solid compressed carbon dioxide particles 33 in the direction of the arrow.
  • the line 15 is double-walled, the cavity being evacuated so that appropriate thermal insulation is provided.
  • Binders based on polyurethane showed uneven layers of carbonized binder and also wood chips after two weeks of production.
  • the layer thickness of these impurities was up to 0.5 mm. Layers with a thickness of 0.3 mm were particularly common.
  • the strips were essentially flat and smooth and had a roughness of 4 ⁇ .
  • Chipboard was produced on the double belt press, the temperature in the heating zone being 210 ° C.
  • the tapes were pressurized to 40 bar held against each other.
  • the nozzles for loading the belts were attached to the drums.
  • the temperature of the product was 45 ° C, whereas the belt as such had a higher temperature of 160 ° C.
  • a compressed air stream with dry ice particles was directed against these belts at a speed of approx.
  • the exit opening of the nozzle was 80 mm from the belt surface.
  • the angle ⁇ which the particles of the parallel-oriented beam made with the belt surface, was 60 °.
  • the solid CO 2 particles had an average diameter of about 0.3 mm, the impact surface was circular with a diameter of 20 mm.
  • a structured decorative panel was built up using the double belt press according to Appendix 1, the upper belt having an etching structure in accordance with a wood grain with a depth of up to 0.1 mm.
  • the outlet was 120 ° C, whereas the surface temperature of the chipboard with decorative film was approx. 90 ° C.
  • the tapes were held against each other at a pressure of 10 bar.
  • the belt speed was 10 m / min. After 24 hours the contamination of the structured tape was such that cleaning had to be started. For this it was necessary that a reactive cleaning film, known under the brand name Swedotec TXZ 400 from Akzo Nobel, be introduced together with the product of the double belt press. It is necessary that the entire
  • cleaning of both the smooth lower belt and the structured upper belt begins after 23 hours of production.
  • the strip surface was acted on analogously to Example 1, with a flat nozzle being used.
  • the impact area of the particles had a width of 40 mm and a height of 10 mm.
  • the cleaning process lasted approx. 45 minutes, whereby the production of the decorative panel could continue undisturbed and a salable product was available.
  • a double belt press which is designed analogously to Example 1, has a lower belt with a width of 1,680 mm, a length of 17 m and a thickness of 1.8 mm and an upper belt with a width of 1,590 mm, a length of 17 m and a thickness of 1.8 mm. These tapes are held against each other at a pressure of 10 bar and are used to produce so-called printed circuit boards that are made with an epoxy resin.
  • the belt speed was 4.0 m / min.
  • the temperature in the heating zone is
  • the roughness of the tape was 4 ⁇ m and, after 48 hours of production, contamination occurred in the form of two longitudinal strips with a width of approximately 20 mm and a layer thickness of 0.1 mm, which were removed by hand using a scraper within four hours. After the cleaning process, the double belt press could be used again for 48 hours. During the production, a cleaning process was carried out analogously to Example 3, with only two revolutions of the belt, that is to say less than 10 minutes, being necessary to remove the strips during production.
  • a belt with a width of 1,200 mm and a total length of 143 m was moved through a 60 m long oven at a speed of 3 m / min.
  • the biscuit product had a temperature of 80 ° C when leaving the oven, whereas the belt temperature was 180 ° C.
  • the smooth band with an average roughness of 4 ⁇ baking residues had a thickness between

Abstract

L'invention concerne un dispositif comportant au moins une bande (2, 3) sans fin en acier, par exemple en acier inoxydable ou chromé, destinée à recevoir des matières à solidifier, qui est conduite à travers au moins une zone de chauffage et une zone de refroidissement et qui, aux deux extrémités, est déviée et éventuellement entraînée par un tambour de renvoi (6, 6', 7, 7'). Le dispositif comporte au moins une buse (9) qui est dirigée vers la surface de formage de la bande et qui peut être déplacée le long d'un guide (22), transversalement par rapport au sens longitudinal de la bande, au moyen d'un entraînement (23). Ladite buse (19) comporte une conduite d'amenée (17) par laquelle passent un fluide et des particules solides, un contenant (16) étant destiné aux particules solides (33). Ce contenant (16) à particules solides (33) est thermiquement isolé et la buse (19) est dirigée vers la bande (3, 4) au niveau du tambour de renvoi (6, 6', 7, 7'), la surface de la bande, en particulier, étant structurée.
PCT/AT2000/000113 1999-05-07 2000-05-03 Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques WO2000067928A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47231/00A AU4723100A (en) 1999-05-07 2000-05-03 Device comprising at least one endless steel belt and method for subjecting plastic materials to thermal stress

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT82899A AT411233B (de) 1999-05-07 1999-05-07 Vorrichtung mit zumindest einem endlosen band aus stahl und verfahren zum thermischen beaufschlagen von plastischen massen
ATA828/99 1999-05-07

Publications (2)

Publication Number Publication Date
WO2000067928A2 true WO2000067928A2 (fr) 2000-11-16
WO2000067928A3 WO2000067928A3 (fr) 2001-03-01

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PCT/AT2000/000113 WO2000067928A2 (fr) 1999-05-07 2000-05-03 Dispositif comportant au moins une bande d'acier sans fin, et procede pour soumettre a une contrainte thermique des matieres plastiques

Country Status (3)

Country Link
AT (1) AT411233B (fr)
AU (1) AU4723100A (fr)
WO (1) WO2000067928A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002072312A1 (fr) * 2001-03-08 2002-09-19 Linde Aktiengesellschaft Procede de traitement par projection de matiere
WO2010063468A1 (fr) * 2008-12-03 2010-06-10 Sms Siemag Ag Dispositif et procédé de nettoyage de rouleaux et/ou cylindres dans des installations de coulée, laminoirs ou lignes de fabrication de bande

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424136C (de) * 1926-01-16 A T G Allg Transportanlagen Ge Reinigungsvorrichtung fuer Gurt-, Plattenband- und Stahlbandfoerderer
US1793246A (en) * 1929-02-09 1931-02-17 Link Belt Co Apparatus for cleaning sticky material from conveyer belts
DE4103577A1 (de) * 1990-02-09 1991-08-14 Taiyo Sanso Co Ltd Reinigungsvorrichtung fuer einen gegenstand mit einer zu reinigenden oberflaeche
EP0474625A2 (fr) * 1990-09-06 1992-03-11 BERNDORF BAND GesmbH Procédé pour dresser en particulier des feuillards sans fin
DE4112890A1 (de) * 1991-04-19 1992-10-22 Abony Szuecs Eva Verfahren und vorrichtung zum reinigen von oberflaechen, insbesondere von empfindlichen oberflaechen
FR2700758A1 (fr) * 1993-01-26 1994-07-29 Freeze Agro Ingeniere Dispositif de nettoyage pour tapis transporteur d'un surgélateur de produits alimentaires en vrac et surgélateur équipé de ce dispositif.

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FR2630668B1 (fr) * 1988-04-28 1990-11-16 Commissariat Energie Atomique Procede et dispositif de fabrication de billes de glace et application a la projection de ces billes de glace pour les traitements de surface
FR2678527B1 (fr) * 1991-07-05 1993-09-10 Commissariat Energie Atomique Appareil de stockage et de projection de billes de glace.
US5315793A (en) * 1991-10-01 1994-05-31 Hughes Aircraft Company System for precision cleaning by jet spray
DE4140982A1 (de) * 1991-12-12 1993-06-17 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen herstellen von oberflaechenstrukturierten plattenbahnen und damit hergestellte spanplatte
NZ244418A (en) * 1992-09-21 1994-11-25 New Zealand Ind Gases Mesh conveyor for freezing apparatus cleared by pressurised gas directed through mesh apertures to clear refrigerant build-up
US5364474A (en) * 1993-07-23 1994-11-15 Williford Jr John F Method for removing particulate matter
DE19636305C1 (de) * 1996-09-06 1998-03-12 Linde Ag Verfahren und Vorrichtung zur Entfernung von Beschichtungen oder Belägen von Oberflächen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424136C (de) * 1926-01-16 A T G Allg Transportanlagen Ge Reinigungsvorrichtung fuer Gurt-, Plattenband- und Stahlbandfoerderer
US1793246A (en) * 1929-02-09 1931-02-17 Link Belt Co Apparatus for cleaning sticky material from conveyer belts
DE4103577A1 (de) * 1990-02-09 1991-08-14 Taiyo Sanso Co Ltd Reinigungsvorrichtung fuer einen gegenstand mit einer zu reinigenden oberflaeche
EP0474625A2 (fr) * 1990-09-06 1992-03-11 BERNDORF BAND GesmbH Procédé pour dresser en particulier des feuillards sans fin
DE4112890A1 (de) * 1991-04-19 1992-10-22 Abony Szuecs Eva Verfahren und vorrichtung zum reinigen von oberflaechen, insbesondere von empfindlichen oberflaechen
FR2700758A1 (fr) * 1993-01-26 1994-07-29 Freeze Agro Ingeniere Dispositif de nettoyage pour tapis transporteur d'un surgélateur de produits alimentaires en vrac et surgélateur équipé de ce dispositif.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ, Week 199501 Derwent Publications Ltd., London, GB; Class Q35, AN 1995-003954 XP002152204 & NZ 244 418 A (NEW ZEALAND IND GASES LTD) , 25. November 1994 (1994-11-25) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002072312A1 (fr) * 2001-03-08 2002-09-19 Linde Aktiengesellschaft Procede de traitement par projection de matiere
WO2010063468A1 (fr) * 2008-12-03 2010-06-10 Sms Siemag Ag Dispositif et procédé de nettoyage de rouleaux et/ou cylindres dans des installations de coulée, laminoirs ou lignes de fabrication de bande

Also Published As

Publication number Publication date
ATA82899A (de) 2003-04-15
WO2000067928A3 (fr) 2001-03-01
AT411233B (de) 2003-11-25
AU4723100A (en) 2000-11-21

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