DE1810182A1 - Method of making a mold - Google Patents
Method of making a moldInfo
- Publication number
- DE1810182A1 DE1810182A1 DE19681810182 DE1810182A DE1810182A1 DE 1810182 A1 DE1810182 A1 DE 1810182A1 DE 19681810182 DE19681810182 DE 19681810182 DE 1810182 A DE1810182 A DE 1810182A DE 1810182 A1 DE1810182 A1 DE 1810182A1
- Authority
- DE
- Germany
- Prior art keywords
- threads
- substrate
- mold
- carbon
- resin
- 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.)
- Pending
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
- D01F9/21—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F9/22—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyacrylonitriles
-
- 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
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/346—Manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
- B29C70/081—Combinations of fibres of continuous or substantial length and short fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
- B29C70/14—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat oriented
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/06—Unsaturated polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2303/00—Use of resin-bonded materials as reinforcement
- B29K2303/04—Inorganic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2307/00—Use of elements other than metals as reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/757—Moulds, cores, dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Textile Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Laminated Bodies (AREA)
- Reinforced Plastic Materials (AREA)
- Finishing Walls (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Description
DA-3110'DA-3110 '
!Beschreibung zu der Patentanmeldung ! Description of the patent application
der Firmaof the company
COURTAULDS LIMITED 18, Hanover Square London W 1, EnglandCOURTAULDS LIMITED 18, Hanover Square London W 1, England
betreffend Verfahren zur Herstellung einer Form relating to methods of making a mold
Priorität: 21. November 1967, Nr. 52 867/6? GroßbritannienPriority: November 21, 1967, No. 52 867/6? Great Britain
Die Erfindung bezieht sich auf Verbesserungen an der Oberfläche von Formen und insbesondere auf ein Verfahren zur Herstellung einer Form bzw. von Forrakörpern, wobei die"Form eine Oberfläche mit besserer Abriebbeständigkeit besitzt.The invention relates to improvements in the surface of molds and, more particularly, to a method for the production of a mold or of mold bodies, where the "shape has a surface with better abrasion resistance owns.
Bei der Herstellung von Formen für die Erzeugung von Gegenständen, die aus natürlich vorkommenden Materialien bestehen, z.B. bei der Herstellung von ZiegelnIn the manufacture of molds for the creation of objects from naturally occurring materials exist, e.g. in the manufacture of bricks
909829/1064909829/1064
und Kacheln aus !Ton, ist es bekannt, ein Verstärkung von Glasfasern in einer Matrix aus einem synthetischen, harzartigen Material vorzusehen. Solche Formen zeigen befriedigende Pormeigenschaften, doch kann ihre Oberfläche wegen der hohen Abriebeigenschaft des zu verformenden Materials stark erodiert bzw. geschädigt werden. Es ist eine Aufgabe der Erfindung, ein Verfahren zur Herstellung von Formen für solche Anwendungszwecke anzugeben, bei denen die Forraoberflache besser abriebbeständig 1st. and tiles made of clay, it is known to provide reinforcement of glass fibers in a matrix of a synthetic, resinous material. Such shapes show satisfactory porous properties, but their surface can be severely eroded or damaged due to the high abrasion properties of the material to be deformed. It is an object of the invention to provide a method for producing molds for such applications in which the mold surface is better abrasion resistant.
Nach der vorliegenden Erfindung besteht ein Verfahren für die Herstellung einer Form darin, daß man ein Auskleidungs- bzw. Futtermaterial in der benötigten Gestalt herstellt. Das Futteraaterial enthält ein faseriges bzw. faserhaltiges gewebtes oder nicht gewebtes Substrat, das auf einer seiner Oberflächen einen Überzug von Kohlenstoff äden mit kurzer Stapellänge trägt, die im wesentlichen parallel zueinander ausgerichtet sind und in we-? sentlichen normal zu der Oberfläche des Futters liegen, das in Berührung mit dem zu verfornenden Material kommen soll. Danach werden die Kohlenstoffäden mit einem Harz-Matrixmaterial imprägniert und auf der anderen Oberflä-According to the present invention, a method for making a mold is that one has a lining or produces lining material in the required shape. The lining material contains a fibrous resp. fibrous woven or non-woven substrate having a coating of carbon on one of its surfaces veins with a short staple length, which essentially are aligned parallel to each other and in we-? are essentially normal to the surface of the lining that will come into contact with the material to be deformed target. After that, the carbon threads are coated with a resin matrix material impregnated and on the other surface
909829/1064909829/1064
des Substrate wird eine Unterlage bsw. Abstützung für das Putter gebildet und somit eine relative starre Form erzeugt.of the substrate becomes a pad bsw. Formed support for the putter and thus created a relatively rigid shape.
Kohlenstoffäden können hergestellt werden, indem wan organisches fadenförmiges Material besonderen Bedingungen hinsichtlich Temperatur, Behandlungsdauer und Umgebungsatmosphäre aussetzt. So können die Fäden in einer ersten Stufe auf eine Temperatur von etwa 200 bis 300° 0 in einer Atmosphäre erhitzt werden, die inert sein kann, jedoch vorz,ugsweise oxydierende Eigenschaften hat. Während dieser Behandlung werden die Fäden einer solchen Spannung ausgesetzt, die notwendig ist, um sie im wesentlichen bei konstanter Länge zu halten. Die Produkte werden dann auf eine Temperatur höher als 1000° C in einer inerten Atmosphäre erhitzt, wobei man karbonisierte Fäden erhält. Wenn die Fäden graphitisiert werden müssen, ist ein weiteres Erhitzen notwendig, das bei einer Temperatur oberhalb von 2000° C und vorzugsweise äk oberhalb von 2500° c, ebenfalls in einer inerten Atmosphäre, stattfindete Das organische fadenförmige Material, aus dem die Kohlenstoffäden erhalten werden, besteht vorzugsweise ganz oder hauptsächlich aus Polyacrylnitril. Carbon threads can be produced by exposing organic thread-like material to special conditions with regard to temperature, duration of treatment and ambient atmosphere. Thus, in a first stage, the threads can be heated to a temperature of approximately 200 to 300 ° C. in an atmosphere which can be inert, but preferably has oxidizing properties. During this treatment the threads are subjected to such a tension that is necessary to keep them at a substantially constant length. The products are then heated to a temperature higher than 1000 ° C. in an inert atmosphere, whereby carbonized threads are obtained. If the threads have to be graphitized, further heating is necessary, which takes place at a temperature above 2000 ° C and preferably ek above 2500 ° C, also in an inert atmosphere. The organic thread-like material from which the carbon threads are obtained, preferably consists entirely or mainly of polyacrylonitrile.
803829/1064803829/1064
Bei dem erfindungsgemä&en- Verfahren kann das Putter z.B. gebildet werden, indem man Kohlen® tof£äden~FloÄen auf ein fesertiaitlges, gewebtes .oder nicht gewebtes- Substrat abscheidet» Die Fäden .sind im wesentlichen parallel zueinander umd normal zu der Oberfliehe des Substrate - ■ orientiert· Dies kann duroh das bekannte Flooken-Üfeer-BUgsverfahreri erreicht werden,, bei' dem die Fäden einem elektrostatischen PeIi ausgesetzt und an der Oberfläche des Substrate.abgeschieden"werden» Besonders geeignete Substrate sind für das.erflndungsgemäQe Verfahren- ge- , webte oder nicht gewebte Textilien aus 61as9 Nylon oder Polyalkylenterephthalat. Die orientierten Fäden kann" man zum Haften an das Substrat nit Hilfe einer Kleb- , stoffmasse veranlassen, die z.B. daist gleiche Harz sein kann, welches die Matrix an der'Fo.rmoberfl'äohe bilden, soll. . ■ " .In the method according to the invention, the putter can be formed, for example, by depositing carbon fibers on a solid, woven or non-woven substrate. The threads are essentially parallel to one another and normal to the surface of the substrate. Oriented This can be achieved using the well-known Flooken-Üfeer-BUgsverfahreni, in which the threads are exposed to an electrostatic pressure and are deposited on the surface of the substrate. Woven or non-woven textiles made of 61as 9 nylon or polyalkylene terephthalate. The oriented threads can "be made to adhere to the substrate with the help of an adhesive, which can for example be the same resin as the matrix on the surface of the mold" uh, should. . ■ ".
flexible Puttermeterial wird anna mit seinem orientierten Oberflächenüberzug aus Kohlehstoff&den mit eignem flüssigen hitzehärtenden Hare wie einem Epoxy- oder Polyesterharz zusammen mit einem geeigneten Katalysatorimprägniert und kann dann verforiiend rund "um1 eine Fora oder einen anderen geeigneten Former der erforderlichen Gestalt gelegt werden» Dann kann 'das Harz gehärtet wer-flexible Puttermeterial is Anna can with its oriented surface coating of Kohlehstoff & the liquid with eignem thermosetting Hare such as an epoxy or polyester resin together with a suitable catalyst impregnated and may then "be verforiiend round" set to 1, a Fora or other suitable former of the required shape Then ' the resin is hardened
I0SS2971064I0SS2971064
den, damit es in der gewünschten Gestalt erhärtet. Sie Form kann dann von der Rückseite des Futtermaterials aufgebaut werden, beispielsweise durch Aufbringen von für das Teigpreßverfahren geeigneten Verbindungen, die danach gehärtet werden oder sie kann in anderer Weise aufgebaut werden mit Methoden, wie das Gießen eines Monomers, wobei ein Monomer wie Caprolactan in Berührung mit der Unterlage des Futtermaterials gebracht und dann in situ polymerisiert wird.the so that it hardens in the desired shape. she Form can then be made from the back of the lining material are built up, for example by applying compounds suitable for the dough pressing process, the thereafter hardened or it can be built up in other ways using methods such as casting a Monomer, whereby a monomer such as caprolactan is brought into contact with the base of the lining material and then polymerized in situ.
Die Erfindung wird durch das folgende Beispiel näher · erläutert. 'The invention is further illustrated by the following example explained. '
Beispiel ' . Example '.
Eine Form mit einer rechteckigen, quaderförmigen Höhlung, geeignet für die Herstellung von Kacheln, wurde wie folgt hergestellt: .A shape with a rectangular, cuboid cavity, suitable for the manufacture of tiles, was made as follows:.
Trennmittel behandelt und dann wurde ein Gelüberzug eines Polyesterharzes aufgebracht. Eine Schicht von gewebtem Glastuch mit einer Schicht von 2,5 mm langen Kohlenstoffaeer-Flocken, die auf einer Seite elektrostatisch abgeschieden worden sind, wurde darübergelegt·Release agent treated and then a gel coat of a polyester resin was applied. A layer of woven glass cloth with a layer 2.5mm long Carbon fiber flakes that have been electrostatically deposited on one side have been laid over it
909829/1064909829/1064
wobei sich die mit Flocken beschichtet® Fläch® in Berührung
mit dem GelUberaisg befand. Bin überzug aus Polyesterharz
wurde gleichmäßig über das gewebte Tuch aufgebracht ( bis die Glasfasern durch und durch benetzt
waren« Weitere Schichten von Stapelglasseide und Harz
wurden abwechselnd in an sich bekannter Welse aufgebracht, bis eine geeignete Formdicke erreicht war. Die
Forufanordnung wurde dann gehärtet und der rechteckige
Kern entfernt.where the flake coated® surface was in contact with the Gel Uberaisg. A polyester resin coating was applied evenly over the woven cloth ( until the glass fibers were thoroughly wetted)
Further layers of staple glass silk and resin were alternately applied in a known manner until a suitable form thickness was achieved. The foruf assembly was then cured and the rectangular core removed.
Die so gebildete Form war geeignet für di® Herstellung von Betonsteinen bzw. -siegeln und zeigte weniger Erosion, als eine in gleicher Weise hergestellte Form,bei der keine Kohlenstoffaeern senkrecht zu der Oberfläche angeordnet waren.The shape so formed was suitable for di® manufacture concrete blocks or seals and showed less erosion, as a form made in the same way, with no carbon grains perpendicular to the surface were arranged.
6 -6 -
ORIGINAL INSPECTEDORIGINAL INSPECTED
9.09829/106-9.09829 / 106-
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5286767 | 1967-11-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1810182A1 true DE1810182A1 (en) | 1969-07-17 |
Family
ID=10465626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19681810182 Pending DE1810182A1 (en) | 1967-11-21 | 1968-11-21 | Method of making a mold |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS4947001B1 (en) |
AT (1) | AT282455B (en) |
DE (1) | DE1810182A1 (en) |
ES (1) | ES360502A1 (en) |
FR (1) | FR1594810A (en) |
GB (1) | GB1238019A (en) |
NL (1) | NL6816581A (en) |
SE (1) | SE333112B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR900008808B1 (en) * | 1985-12-20 | 1990-11-30 | 가부시기가이샤 다나사와 핫고오샤 | Plastics shaping mold and method of preparing mold |
-
1967
- 1967-11-21 GB GB1238019D patent/GB1238019A/en not_active Expired
-
1968
- 1968-11-20 SE SE1577468A patent/SE333112B/xx unknown
- 1968-11-20 NL NL6816581A patent/NL6816581A/xx unknown
- 1968-11-21 AT AT1133568A patent/AT282455B/en not_active IP Right Cessation
- 1968-11-21 ES ES360502A patent/ES360502A1/en not_active Expired
- 1968-11-21 JP JP8552868A patent/JPS4947001B1/ja active Pending
- 1968-11-21 DE DE19681810182 patent/DE1810182A1/en active Pending
- 1968-11-21 FR FR1594810D patent/FR1594810A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES360502A1 (en) | 1970-07-16 |
JPS4947001B1 (en) | 1974-12-13 |
AT282455B (en) | 1970-06-25 |
FR1594810A (en) | 1970-06-08 |
NL6816581A (en) | 1969-05-23 |
GB1238019A (en) | 1971-07-07 |
SE333112B (en) | 1971-03-01 |
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