EP0228538A1 - Procédé et dispositif pour fabriquer des pièces de moulées munies conduits et en poudre moulable, notamment en matière moulable céramique, dénomination typique: honeycomb - Google Patents

Procédé et dispositif pour fabriquer des pièces de moulées munies conduits et en poudre moulable, notamment en matière moulable céramique, dénomination typique: honeycomb Download PDF

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Publication number
EP0228538A1
EP0228538A1 EP86115404A EP86115404A EP0228538A1 EP 0228538 A1 EP0228538 A1 EP 0228538A1 EP 86115404 A EP86115404 A EP 86115404A EP 86115404 A EP86115404 A EP 86115404A EP 0228538 A1 EP0228538 A1 EP 0228538A1
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EP
European Patent Office
Prior art keywords
mold cavity
rods
mold
molding compound
inflation
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP86115404A
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German (de)
English (en)
Other versions
EP0228538B1 (fr
Inventor
Eugen Bühler
Klaus Strobel
Karl Schwarzmeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hutschenreuther AG
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Hutschenreuther AG
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 Hutschenreuther AG filed Critical Hutschenreuther AG
Priority to AT86115404T priority Critical patent/ATE57128T1/de
Publication of EP0228538A1 publication Critical patent/EP0228538A1/fr
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Publication of EP0228538B1 publication Critical patent/EP0228538B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/32—Cores; Mandrels adjustable, collapsible, or expanding inflatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/08—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form with two or more rams per mould
    • B28B3/086—The rams working in different directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/18—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
    • B28B7/183—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article for building blocks or similar block-shaped objects

Definitions

  • the invention relates to a process for the production of channeled compacts from powdered mass, in particular ceramic molding compound.
  • the size of the moldings to be produced is arbitrary; the cross section of the channels to be produced ranges from 3 mm to 8 mm in diameter and above.
  • the cross-sectional shape of the channels can be round or polygonal, e.g. B. be square.
  • the compacts to be produced are intended in particular for further processing into moldings which have a large inner surface and are used in physical and chemical reactions.
  • the inner surface is formed exclusively by the channels.
  • the molding compound can either itself be a reactant, for example a catalytic reactant.
  • the molding compound it is also conceivable for the molding compound to be mixed with a substance which is a reactant, for example a catalytic reactant.
  • the molded body in particular in the region of the channels, is coated with a substance, for example by vapor deposition, and that this coating is effective as a reactant, for example a catalytic reactant, in the respective process.
  • the moldings obtained from the compacts are used wherever large surfaces are required, for example in the heat exchange between aggressive media.
  • the compacts can be finished to the shaped bodies in a conventional manner by firing or sintering.
  • the invention is based on the object of specifying a method by means of which it is economically possible to obtain moldings with a large inner surface which have sufficient stability to withstand the further processing processes in question, for example firing or sintering, without danger can be subjected to substantial damage or destruction and which are still so stable that they are on the necessary paths from the molding production can be handled for further processing without risk of substantial damage or destruction.
  • the inflation hoses are expanded to the compact by means of fluid pressure brought in to the inside, with the molding compound being compacted, and, after the fluid pressure has been reduced, the coated bars from the Compacted withdrawn and this is removed from the mold cavity.
  • spray-dried granules may be mentioned as an example, as is mentioned, for example, in DE-OS 31 01 236 on page 31, last paragraph and page 32, first paragraph.
  • very high pressures can be applied by expanding the inflation hoses under fluid pressure, in particular under hydraulic pressure using a liquid fluid, which lead to isostatic compaction of the material, so that its stability after pressing and before firing, Sintering or other hardening is guaranteed.
  • fluid pressure in the inflation hoses After the fluid pressure in the inflation hoses has been reduced, they immediately return to their starting position of smaller diameter due to the elasticity of the materials that are regularly used, such as rubber or other elastomers, so that it is readily possible to withdraw the rods immediately after the inflation process and with it the hoses, and in this way to demold the compact.
  • channels of very small caliber for example with a diameter of 1 to 10 mm
  • moldings with a very large specific surface as used, for example, in the exhaust gas detoxification of commercial systems, but also in Exhaust gas detoxification from motor vehicles are needed.
  • the rods and the swelling noises require a considerable manufacturing outlay, particularly when forming channels of small caliber.
  • the hoses and the channels are only subjected to relatively low loads even at high pressures of the fluid, since the load is absorbed by the molding compound or by the guides receiving the rods and the hoses in the boundary walls of the mold cavity. It can therefore be expected that the equipment used to manufacture the moldings will have a long service life.
  • the dimensions of the mold cavities can be chosen as large as desired, depending on the technique used for the filling. As a rule, the dimensioning of the mold cavity will be made dependent on the requirements for the dimensions of the molded body ultimately used. In the event that molded articles of extreme size are required, it is also possible to produce building blocks for the required molded articles by the process according to the invention and to place them on top of one another and, if necessary, to connect them to one another.
  • the pressing process which is essentially based on the contribution of the inflation hoses, can also be assisted by exposing a membrane, which at least partially delimits the mold cavity, to a fluid pressure on the side remote from the molding composition, in particular at the same time as the fluid pressure is applied to the inflation hoses.
  • the proportion of compaction that is supplied by the membrane naturally depends on the total cross section of the molding produced and becomes smaller the larger this cross section becomes.
  • the invention further relates to a device for producing channeled compacts on powdered molding compound, in particular ceramic molding compound, namely a device in particular for carrying out the method discussed above.
  • Such a device is characterized by a mold cavity, a group of bars within the mold cavity, which are covered with inflation hoses at least over part of their length, a filling device for filling the mold cavity with powdered mass and a fluid supply device for the supply of pressure fluid to the inside of the Inflatable hoses.
  • the mold cavity can be at least partially delimited by a pressurizable membrane in order to exert compacting pressure on the resulting compact from the outside.
  • the membrane will preferably be made as a jacket membrane with generators parallel to the bars; it has been shown that optimal uniformity of density in the compact is obtained.
  • the bars be at least at their ends transverse to their longitudinal direction in a fixed position with respect to the mold cavity during the pressurization of the inflation hoses and possibly the membrane. It has been shown that an exact distribution of the channels and an approximately constant cross-section of the channels over their length is achieved in this way, so that a plurality of molded bodies obtained from such compacts with aligned channels can be connected to one another.
  • the linear bear for example, the press bear one common in the ceramic industry Press can be used, a press that is anyway necessary to apply the mold clamping force for the mold cavity.
  • a perforated mold wall of the mold cavity facing the rod holder and penetrated by the rods is connected to the rod holder for common movement by the linear drive.
  • the penetrated mold end wall can form the essential part of the rod holder.
  • the squeeze plate can be enclosed between a surface of the respective perforated mold end wall remote from the mold cavity and a perforated pressure plate, this pressure plate being able to be pressed against the respective mold end wall by conventional hydraulic or pneumatic means.
  • the supply of the inflation hoses with pressurized fluid that they are connected or connectable to at least one end to a central fluid supply chamber, whereby this fluid supply chamber can be formed in the region of one mold end wall or both mold end walls and, if necessary, with the Form end wall can be combined into a structural unit.
  • the unimpeded inflow of fluids to the inflation hoses can be secured according to a first possibility in such a way that the inflation hoses are open at at least one end and lie freely against or project above the respective rod, the open end being in communication with the fluid supply chamber. If it turns out that when the pressure is being applied, the inflation hoses are closed unintentionally, they can be expanded in a funnel shape at their open ends or the rods can be designed with fluid supply grooves on their surface and / or fluid supply channels on the inside.
  • this embodiment it is possible to work with inflation hoses which are open at both ends; the holder of the rods and the inflation hoses at one end is particularly simple in that the holder is simply taken over by the one squeeze plate.
  • the installation of the coated rods is extremely simple because the rods only have to be inserted through the squeeze plate in order to then be held in the axial and transverse directions when the squeeze plate is squeezed.
  • the mold cavity can be provided with air suction means and at least one molding compound filling opening if the mold shooting known from DE-OS 31 01 236 is to be used. It is advisable, according to the specifications of DE-OS 31 01 236, to carry out the air suction means as a circumferential gap or a circumferential row of openings along the joint between a mold end wall and a mold jacket and the at least one molding compound filling opening in the joint area between the To arrange the mold jacket and an opposite mold end wall. In this way, the requirement already laid down in DE-OS 31 01 236 is met that the air extraction openings should be located along at least a maximum circumference of the mold cavity and the molding material supply at one point as evenly as possible from the suction openings or the suction gap. For details, reference is made to the disclosure of DE-OS 31 01 236 and the corresponding US Pat. No. 4,473,526.
  • the demolding it can be advantageous to design the mold cavity with an at least two-part mold jacket.
  • the design with a subdivided molded jacket allows molded molded parts to be molded on the outside of the molded part, which differ from the cylindrical or prismatic shape, for example mounting flanges.
  • a closed molded jacket can be used which supports the jacket membrane on the inside.
  • the jacket membrane also opens up the possibility of attaching profilings to the outside of the molding, including profilings that deviate from the cylindrical or prismatic shape of the molding. The only prerequisite for this is that the possible retraction path of the membrane is set so that it is greater than the height of such profiles relative to the surface of the molding.
  • the molding compound filling opening can be implemented by a sealing stamp with an end surface adapted to the shape of the molding cavity if one wishes to avoid impressions of the molding compound at the location of the molding compound supply opening.
  • the bars run essentially vertically within the mold cavity and can be pulled out of the mold cavity upwards. This is also advantageous in order to avoid bending of the bars due to their own weight when inserting them into the mold cavity and to thereby possibly avoid difficulties which could arise when the bars and inflation tubes are threaded into the openings in the opposite end wall of the mold.
  • the stand of a ceramic press is designated 10. from this stand 10 several tie rods 12 project upwards. These tie rods 12 are connected to one another at their upper end by a press yoke 14. A press bear 16 is guided vertically on the tie rods 12 and can be moved up and down by a hydraulic ram 18. A lower mold end wall 20 is stretched on the press stand 10. An upper mold end wall 22 and a group of vertical, inflatable tube-covered rods 24 are arranged on the press bear 16. The bars 24 with the inflation hoses are laterally spaced apart. On the press stand 10 two mold shell halves 26a and 26b are further attached, which together form a mold shell 26.
  • the mold shell halves 26a and 26b can be adjusted by hydraulic auxiliary presses 28a and 28b between a mold opening position shown in FIG. 1 and a mold shell closing position shown in FIG. 2.
  • Centering mandrels 30 are attached to the press bar 16 and engage in blind bores 32 of the shaped jacket 26 when the press bar 16 goes down with the molded jacket 26 closed to place the upper mold end wall 22 on the jacket 26.
  • the press bar 16 moves downward, so that the inflatable tube-covered rods 24 move into the mold cavity 34 formed within the mold jacket 26 (FIG. 2).
  • the mold cavity 34 is then filled with this molding material by sucking in powdered molding compound.
  • the inflation hoses, which surround the rods 24, are then inflated, so that a honeycomb-shaped compact is formed.
  • FIGS. 4, 5 and 6 Further details are shown in FIGS. 4, 5 and 6.
  • the upper mold end wall 22 is fastened to the press bear 16 by means of spacers 36. Within the spacers 36 two interconnected pressure plates 38 and 40 are attached. The centering pins 30 are connected to these pressure plates 38 and 40. The lower pressure plate 38 is perforated many times for receiving the rods 24. Likewise, as can be seen from FIG. 4, the upper mold end wall 22 is perforated many times for the passage of the rods 24. Between the pressure plate 38 and the upper mold end wall 22 there is a flat disk-shaped one Chamber formed for receiving a squeeze plate 42, which is formed between a squish surface 44 of the upper mold end wall 22 and a squish surface 38a of the pressure plate 38. A fluid supply chamber 46 is formed between the two pressure plates 38 and 40 and is connected to a fluid supply channel 48. The pressure plates 38 and 40 can be adjusted up and down by an auxiliary stamp 50.
  • the rods 24 are covered by inflation hoses 52. It can be seen that the rods 24 and the tubes 52 extend to the top of the pressure plate 38, that is to say both the upper mold end wall 22 and the squeeze plate 42 and the lower pressure plate 38 pass through in bores.
  • the upper open inflation hose ends are in communication with the fluid supply chamber 46.
  • rods 24 are provided with inner channels 54 and 54a, which are also in communication with the fluid supply chamber 46 and bring fluid to the inside of the inflation hoses 52.
  • a squeeze plate 64 is received between the upper pressure plate 56 and the lower mold end wall 20, specifically between a squeeze surface 66 of the mold end wall 20 and a squeeze surface 56a of the pressure plate 56.
  • the rods and inflation tubes also penetrate the lower mold end wall 20, the lower squeeze plate 64 and the pressure plate 56; the lower ends of the channels 54 communicate with a lower fluid supply chamber 68.
  • the fluid supply chamber 68 is connected to a fluid supply line 70.
  • the upper mold end wall 22 is provided with an annular seal 72 for placement on the mold jacket 26; the shaped jacket 26 is provided with sealing elements of semi-ring shape, which are denoted by 74 and rest on the lower mold end wall 20.
  • a vacuum line 76 is connected to the shaped jacket, in the region of the shaped jacket half 26a, which leads to an annular gap 78 or a plurality of suction openings 78 distributed in a ring.
  • a molding material supply channel 80 is connected to the upper mold end wall 22 and is connected to a fluidizing air supply line 82.
  • the molding material supply line 80 opens into a molding material supply bore 84, which has an opening 86 in the molding cavity 34. This opening 86 is through a stamp 88 lockable. Several such molding material feeds can be arranged distributed over the circumference.
  • the device is initially in the position shown in FIG. 1.
  • the molded jacket 26 is first closed.
  • the pressbear 16 then moves downward, the inflatable tube-covered rods 24 passing through the perforations of the lower mold end wall 20, the squeeze plate 64 and the pressure plate 56.
  • the inflatable tube-covered rods 24 are held on the bear 16 in that the squeeze plate 42 is squeezed between the squeeze surfaces 38 a and 44.
  • the squeeze plate 64 is relieved so that the bars with the inflatable tubes 52 can pass through the perforation of the lower squeeze plate 64 unhindered.
  • the lower squeeze plate 64 is squeezed by means of the auxiliary stamp 60 and the upper squeeze plate 42 is relieved.
  • the rods 24 are now fixed in the longitudinal direction by the lower squeeze plate 64.
  • the mold cavity 34 is now filled with molding compound by applying a vacuum to the mold cavity 34 through the gap 78 and the sealing die 88 being pulled.
  • the pressurized fluid supply lines 48 and 70 must also a vacuum is applied to the inside of the inflation hoses so that they cannot stand out from the rods 24 under the effect of the vacuum in the mold cavity.
  • the molding compound sucked into the mold cavity is already somewhat pre-compressed by the relatively high impact speed of the molded particles, although care must be taken to ensure that the suction openings 78 are not blocked at least at the beginning of the filling process by adjusting the impact speed.
  • the vacuum applied to the inner surfaces of the inflation hoses 52 is turned off and then pressure is applied via lines 48 and 70 and the fluid supply chambers 46 and 68 to the inner surfaces of the inflation hoses 52, partly via the channels 54, 54a partly over the open ends of the tubes 52.
  • the inflatable tubes are inflated and compact the filled molding compound within the mold cavity 34.
  • the rods 24 cannot change their position laterally, since they are secured in the perforations of the end walls 20 and 22 against lateral movement .
  • the fluid pressure is reduced again through the two fluid lines 48 and 70, so that the inflation tubes are now full in their on the rods 24 return to the current position.
  • the squeeze plate 64 is relieved and the squeeze plate 42 is squeezed again.
  • the press bear can then move upwards, taking the rods with them, which are pulled out of the perforations of the pressure plate 56, the squeeze plate 64 and the lower end wall 20 of the mold.
  • mold shell halves 26a and 26b are moved apart so that the finished compact can be removed.
  • the filling of the inflation hoses can also be supported in that the rods 24 are provided with surface grooves 90, which prevent the inflation hoses from being inadvertently closed when the fluid hoses are applied by tightly fitting them against the rods 24.
  • the mold jacket 126 is a one-piece, annularly closed mold jacket which is lined on the inside by an annular membrane 192, the rear side of the annular membrane 192 being able to be subjected to a vacuum via a fluid supply system 194 when the mold cavity is filled pressure can be applied when the molding compound is pressed.
  • a fluid supply system 194 when the mold cavity is filled pressure can be applied when the molding compound is pressed.
  • the mold shell halves 26a and 26b can be provided with profiles, for example profiles which result in holding elements or a holding flange for the molding. These profiles must of course be shaped so that they take into account the direction of removal.
  • the projections can be arranged either close to the edge or between the edges of the mold shell halves 26a, 26b.
  • profiles can be provided in the molded jacket 126 and in the membrane 192, in order to also produce profiles on the molded article. If these profilings extend parallel to the jacket axis over the entire length of the inner surface of the molded jacket 126, this does not cause any difficulties in the demolding. However, it is also possible to apply profilings to the inner surface of the molded jacket 126 and to the membrane in order to allow corresponding profilings to be formed on the molded article if these profilings do not extend over the entire height of the molded jacket 126, but for example at a distance from the upper edge and lower edge of Form jacket end, or to provide profiles that produce ribs or the like extending in the circumferential direction on the molding.
  • FIG. 10 differs from that of FIG. 5 in that the inflatable hoses 52 are designed differently.
  • the inflatable hoses 52 are closed at their lower ends.
  • the channels 54 are likewise closed at their lower ends.
  • the inflation hoses 52 are integrally connected at their upper ends to a plate 52x made of the same material. In this way, the sealing problem for the pressure medium to be introduced into the inflation hoses 52 is solved in the simplest way.
  • the powdery molding compound used can in particular be a spray grain compound which has been produced as follows:
  • a slip containing 40% by weight water and 60% by weight solid was processed.
  • a dry matter was prepared, which consisted of 50% by weight of kaolinite, 25% by weight of feldspar and 25% by weight of quartz, the percentages in each case based on the total dry matter.
  • the grain size of the kaolinite was max. 25 ⁇ .
  • the grain size of feldspar and quartz was max. 63 ⁇ . field Spat and quartz were introduced in the form of a pegmatite, which contains both the feldspar and the quartz.
  • the dry matter was processed into a suspension or a slip with the addition of the water. This slip was then sprayed through spray nozzles into a hot gas atmosphere.
  • the beads were hollow beads that could be easily crushed between two fingers of one hand.
  • the residual moisture of the granular material obtained in this way was approx. 3%.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Filtering Materials (AREA)
  • Catalysts (AREA)
EP86115404A 1985-11-29 1986-11-06 Procédé et dispositif pour fabriquer des pièces de moulées munies conduits et en poudre moulable, notamment en matière moulable céramique, dénomination typique: honeycomb Expired - Lifetime EP0228538B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115404T ATE57128T1 (de) 1985-11-29 1986-11-06 Vefahren und einrichtung zur herstellung von mit kanaelen versehenen presslingen aus pulverfoermiger formmasse, insbesondere keramischer formmasse stichwort: honeycomb.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3542332 1985-11-29
DE19853542332 DE3542332A1 (de) 1985-11-29 1985-11-29 Verfahren und einrichtung zur herstellung von mit kanaelen versehenen presslingen aus pulverfoermiger formmasse, insbesondere keramischer formmasse stichwort: honeycomb

Publications (2)

Publication Number Publication Date
EP0228538A1 true EP0228538A1 (fr) 1987-07-15
EP0228538B1 EP0228538B1 (fr) 1990-10-03

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EP86115404A Expired - Lifetime EP0228538B1 (fr) 1985-11-29 1986-11-06 Procédé et dispositif pour fabriquer des pièces de moulées munies conduits et en poudre moulable, notamment en matière moulable céramique, dénomination typique: honeycomb

Country Status (6)

Country Link
US (3) US4853170A (fr)
EP (1) EP0228538B1 (fr)
JP (1) JPS62216703A (fr)
AT (1) ATE57128T1 (fr)
DD (1) DD252573A5 (fr)
DE (2) DE3542332A1 (fr)

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GB2227707B (en) * 1988-12-24 1993-06-16 T & K Int Kenkyusho Kk Method of and device for seal molding electronic components with resin
EP0446665A1 (fr) * 1990-03-14 1991-09-18 Asea Brown Boveri Ag Procédé de préparation d'une ébauche à partir d'une poudre métallique ou céramique
US5391533A (en) * 1993-02-19 1995-02-21 Amtx, Inc. Catalyst system for producing chlorine dioxide
US6406659B1 (en) 1995-03-28 2002-06-18 Eric Lang Composite molding method and apparatus
US6919039B2 (en) * 1995-03-28 2005-07-19 Eric J. Lang Channel assisted resin transfer molding
IT1279893B1 (it) * 1995-12-18 1997-12-18 F D S S R L Semistampo per piastrelle ceramiche perfezionato
US20020109266A1 (en) * 1999-10-26 2002-08-15 Gooden John K. Sculptor's pressure vessel
US5997274A (en) * 1997-12-10 1999-12-07 Gooden; John K. Sculptor's pressure vessel
EP0992272A1 (fr) * 1998-10-08 2000-04-12 Corning Incorporated Filtre poreux en forme d'un nid d'abeilles formé dans une presse
DE10028865C2 (de) * 2000-06-10 2002-09-26 Xcellsis Gmbh Vorrichtung zur katalytischen Wasserstofferzeugung aus Kohlenwasserstoffen
FR2818578B1 (fr) * 2000-12-26 2003-03-21 Snecma Moteurs Procede de fabrication de structures en nid d'abeilles et outillage pour une telle fabrication
US6524504B2 (en) * 2001-01-04 2003-02-25 Masonite Corporation Method of producing cellulosic article having increased thickness, and product thereof
ES2223264B1 (es) * 2003-03-05 2005-12-16 Pablo Peris Dominguez Procedimiento de obtencion de piezas ceramicas con perforaciones y dispositivo correspondiente.
ES2978301T3 (es) * 2018-08-10 2024-09-10 Soremartec Sa Procedimiento para aplicar material granular en el lado exterior de un producto alimenticio
DE102019100894B3 (de) * 2019-01-15 2020-04-23 Borgwarner Ludwigsburg Gmbh Zündspule

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DE882973C (de) * 1949-06-30 1953-07-13 Emil Metzger Verfahren zur Herstellung von hohlen Bauelementen
DE1016178B (de) * 1953-08-10 1957-09-19 Eugen Wiest Dipl Ing Vorrichtung zum Pressen von Hohlbausteinen
DE3101236A1 (de) * 1980-01-23 1982-01-28 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren zur herstellung trockengepresster formlinge und vorrichtung zur durchfuehrung dieses verfahrens

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Publication number Priority date Publication date Assignee Title
DE537886C (de) * 1926-07-22 1931-11-10 August Andre Galy Vorrichtung zum Formen von Hohlkoerpern mit durch den ganzen Formling hindurchgebenden Hohlraeumen
DE882973C (de) * 1949-06-30 1953-07-13 Emil Metzger Verfahren zur Herstellung von hohlen Bauelementen
DE1016178B (de) * 1953-08-10 1957-09-19 Eugen Wiest Dipl Ing Vorrichtung zum Pressen von Hohlbausteinen
DE3101236A1 (de) * 1980-01-23 1982-01-28 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren zur herstellung trockengepresster formlinge und vorrichtung zur durchfuehrung dieses verfahrens

Also Published As

Publication number Publication date
US5039296A (en) 1991-08-13
JPS62216703A (ja) 1987-09-24
EP0228538B1 (fr) 1990-10-03
US4853170A (en) 1989-08-01
US5120213A (en) 1992-06-09
DD252573A5 (de) 1987-12-23
DE3542332A1 (de) 1987-06-04
DE3674751D1 (de) 1990-11-08
ATE57128T1 (de) 1990-10-15

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