EP1009608A1 - Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities - Google Patents
Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavitiesInfo
- Publication number
- EP1009608A1 EP1009608A1 EP98946251A EP98946251A EP1009608A1 EP 1009608 A1 EP1009608 A1 EP 1009608A1 EP 98946251 A EP98946251 A EP 98946251A EP 98946251 A EP98946251 A EP 98946251A EP 1009608 A1 EP1009608 A1 EP 1009608A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- matrix material
- insert elements
- cavities
- forming
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/18—Filling preformed cavities
- B29C44/182—Filling flexible bags not having a particular shape
- B29C44/184—Filling flexible bags not having a particular shape and inserting the bags into preformed cavities
- B29C44/185—Starting the expansion after rupturing or dissolving the bag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
- Y10T156/1003—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina by separating laminae between spaced secured areas [e.g., honeycomb expanding]
Definitions
- the invention relates to a method for the production of art, line or
- Gas-forming insert elements for use in the aforementioned processes are also specified.
- Plastic coating bulges outwards.
- the peripheral surface of a roller can thus be deformed in a desired manner.
- German patent application DE 33 24 705 A1 already describes a method for producing a cavity-containing and sound-absorbing cladding made of textile fibers, which is preferably used in vehicle construction, on the one hand to clad particularly drone-sensitive areas and on the other hand to insulate against airborne noise.
- the lining consists of at least two mats made of textile fibers, e.g. B. tear wool, are made with the admixture of a binder effective at elevated temperature.
- a shaped body in the form of an endless web is inserted between the mats. Then the individual layers are needled and pressed together. Here, the mats and the endless web are pressed more strongly in areas than in other areas.
- the molded body melts or gas under one Treatment temperature off, so that voids form in the areas with the lower compression during pressing.
- the areas with a higher compression serve as webs for stiffening the
- the mat is partially connected by the binders that become effective under heat.
- the moldings are preferably made of foam, for example foamed polystyrene or other plastics with a low gasification temperature.
- EP 0 679 501 A1 describes a composite material, in particular for the production of seals in automotive engineering
- the composite material consists of a support material forming a cavity and a hot-foaming material located therein.
- hot foaming material e.g. B. polymers or copolymers of ethylene and unsaturated acrylic esters, u understand that this material at least partially turns into foam when heated.
- Support material e.g. B. with polyamide components, has a melting temperature that is greater than the starting temperature for the foaming process.
- the composite material is manufactured in pre-selected forms in order to place it in an installation location in which the sealing is to take place.
- the support material has at least one, preferably two oppositely arranged openings through which the hot foaming material can escape after activation and thus the escaping foam seals the composite material with the walls of the installation space.
- As a manufacturing process for the preformed composite material parts it is specified, for example, to extrude the hot-foaming material between two polyamide films. Then the composite material parts are punched out in the preselected shape and the two outer foils are connected to one another.
- reaction injection molding process for the production of a tool part with a dense outer layer made of a polyurethane duromer is known from German published patent application DE-OS 1 926 688. Find the tool parts Application in vehicle construction and in the household appliance industry, where tool parts of large dimensions, thick cross sections and with good qualities are required.
- the reaction injection molding of the foaming polyurethane thermoset takes place in a mold that has a core.
- the core is formed from an elastic sleeve with a tubular opening and is filled with a gas or a liquid.
- a laminate is known from European patent application EP 0 443 364 A2, which has stable fastening points in a foam or honeycomb-shaped core layer made of a temperature-resistant plastic.
- foam-shaped inserts for forming the fastening points with a higher density than the core layer are arranged in the core layer.
- the core layer is provided with at least one cover layer made of a fiber-reinforced, temperature-resistant plastic.
- Such laminates are preferably used in the interior of aircraft. As an example for inserting the inserts into the
- the core layer is given to mill cavities in the core layer and to fill granulate containing blowing agent therein.
- the foaming granules penetrate into the core layer and anchor themselves there. Then self-tapping threaded bushes can be screwed into the insert.
- the blowing agents are used to foam a plastic to create a high density foam.
- honeycomb structures from a thermoplastic for use in lightweight panels is also known from US Pat. No. 4,113,909.
- a plate of the thermoplastic is inserted between two mold plates, heated and then the mold plates are moved apart.
- the thermoplastic adheres to the mold plates when hot and the pulled apart thermoplastic forms a honeycomb structure.
- the present invention has for its object to provide a method for producing particularly light and solid tool parts, in particular lightweight composite parts.
- the present invention extends the state of the art by the possibility of creating numerous, but individually closed macro cavities in a matrix material without complex gas supply from the outside, which preferably leads to a honeycomb structure formation with a homogeneous connection with the cover layers.
- the insert elements that can be excited to form gas consisting of gas-forming substances and a covering or a fixed application, in the form of circular, polygonal or ring-shaped disks, are fixed on nets, inserted individually into a workpiece part, arranged in at least two-layer surrounds, arranged in a grid pattern for the insert between semifinished products or as granules in plastic bags, to be subsequently pressed, extrusion-coated, coated, injected or as a plasticized blowing agent mass during coinjection, extrusion or injection molding together with the plastics in combination after the gas formation to form the cavities.
- the weaving machine specifically places the insert elements in the programmed grid during the weaving process.
- Multi-shot machines place the insert elements in the staggered grid positions on two levels. These woven inserts with the inserted insert elements are inserted into the tool parts and overmolded. The subsequent gas formation leads to a prestressing of the fabric.
- the molded workpiece has a higher strength due to the molded reinforcement.
- lightweight composite workpieces with cavities can be coated inexpensively in one operation with lacquer films and interior decorations as cover layers using the method according to the invention.
- These lightweight composite workpieces are unbreakable, high-strength and low-deformation, and are particularly suitable for use as supporting parts in automobile, ship and aircraft construction.
- fiber-reinforced plastics or thin sheets as cover layers high-strength construction elements are produced.
- the wall thickness of the components is kept low.
- the spatially curved shells with a stiffening bond that is homogeneously connected in one work step, as well as the use of the diverse cavity design as pipeline, pipe, corrugated and double corrugated honeycomb structures can be used in numerous further plastic processing processes.
- the location of the cavity formation is predetermined by the location of the insert elements.
- the cavity size is in the macro range and is determined by the size of the
- Cover layers consist of load-bearing, homogeneously bonded material. - The design of the wall thickness of the matrix material, the shape and size of the
- Cavities are predetermined by shape and location, amount of propellant and arranged according to static expediency.
- the structured dressing is aligned according to the direction of the shape of the insert elements and their size in accordance with the loads on the workpiece.
- the gas formation and thus the formation of the cavities advantageously takes place only in a predetermined localized manner.
- the blowing agent substances are released after thermoplastic spatial deformation of the preform and homogeneous connection of layers or prepregs to form the macro cavities, for example for a stiffening composite, pipe systems, isolation chambers, etc.
- Bursting of envelopes of enclosed substances and reaction diffusion of two gas-forming substances, which are separated by means of a porous film and penetrate and react to trigger them by means of pressure;
- Time-delayed processes chemical reactions with a specific time delay, reaching a critical mass by compression in order to trigger the gas or heat-generating reaction; Start of reaction by means of a combination of the above-mentioned processes with additional heat-generating igniters per egg element.
- the exothermic reaction softens the matrix material during the formation of cavities.
- the expansion of the endothermic gas is associated with a drop in temperature during expansion, which in turn can be used for the rapid solidification of the thermoplastic materials.
- One advantage of the endothermic blowing agents is the more controlled process of gas formation and the faster cycle times.
- Physical blowing agents consisting of easily evaporating hydrocarbons (pentane to heptane KP 30 to 100 ° C) are also suitable. Also chemical are exothermic azo compounds, N-nitroso compounds and
- Sulfonyl hydrazides can be used at light-off temperatures of 90 to 275 ° C.
- Suitable chemical endothermic blowing agents are NaHCO 3 and hydrocerol.
- the abovementioned substances generally begin with the decomposition and thus gas formation when a start temperature is reached which corresponds to the requirements of the matrix material.
- the much-used azodicarbonamide can be set to 155-200 ° C as the starting temperature using so-called kickers, e.g. Pb and Zn stabilizers.
- blowing agent substances are produced in powder or granular form.
- the blowing agents are either added as granules in the feed hopper to the screw of a plastic injection molding machine or, in the case of plastic components, stirred in as a powder.
- gas formation is delayed due to the high processing pressure.
- Gas-forming insert elements with heat-stable explosive can also be used, which release prescribed amounts of gas by means of electrical ignition. These are currently used in the airbag of the car.
- Insensitive explosives blasting agents
- an effective igniter cellulose nitrate, mercury (ll) -fulminate, lead acid, silver acid, tetrazene, diaodinitrophenol, lead trinitroresorcinate
- booster charges to complete the explosive reaction and are, for example: glycerol trinitrate, ammonium nitrate, ammonium nitrate.
- FIG. 1A to 1 D show schematically the sequence of a pressing process.
- a prefabricated composite part consisting of a left cover layer 4, a matrix material 5 and a right cover layer 6 is placed between the open tool parts 1 and 2 (see FIG. 1A) of a press, not shown.
- Gas-forming insert elements 7a arranged in a grid are applied to the left of the matrix material 5.
- gas-forming insert elements 7b are applied.
- These layers of matrix material 5 and insert elements 7a, 7b can optionally be designed in multiple layers.
- the composite part is pressed by moving the tool parts together (see FIG. 1B) and the gas formation of the insert elements 7 is triggered by pressure and / or temperature. After complete gas formation, the
- Tool parts 1, 2 (see Figure 1 C). moved apart, the tool parts 1, 2 being sealed against one another by means of a sealing plunge edge 11 in order to maintain the gas pressure for expanding the matrix material 5.
- the workpiece detached from the tool parts 1, 2 now consists of the left cover layer 4, the matrix material 5, which is now spatially deformed by the gas pressure, and the right cover layer 6.
- the residues 12 of the gas-forming insert elements 7 remain In the cavities 9.
- FIGS. 2A to 2E schematically show the sequence of a blow molding process.
- An essential application of the plastically inserted gas-forming insert elements 7 is conceivable in blow molding.
- the preforms for blow molding are either manufactured using the injection molding process (see FIGS. 7 or 8) or - as shown here in FIGS. 2A to B - extruded.
- the actual blowing process is independent of the manufacture of the preforms and is shown in FIGS. C to E.
- FIG. 2A shows part of a cross section of a 5-fold co-extrusion nozzle which forms a rotating body about the axis 22.
- the 5 processable materials consist of the upper cover layer 4, the upper gas-forming insert elements 7a, the matrix material 5, the lower insert elements 7b and the lower cover layer 6.
- the upper 7a and lower 7b gas-forming insert elements are arranged in a grid pattern between the Cover layers 4, 6 and the matrix material 5 introduced. This is controlled by segmented slider 23 by sliding it back and forth. A tubular, continuously extruded tube 21 is thus produced.
- the extruded tube 21 is shown in cross section in FIG. 2B.
- the gas-forming insert elements 7a introduced at the top in a grid pattern are offset by a grid, in relation to the gas-forming insert elements 7b introduced at the bottom in a grid pattern.
- part of the tube is cut off and squeezed.
- this preform 28 is introduced into the mold 29 and blown.
- FIG. 2D shows how an initiator 30 is introduced for stimulating the gas formation of the insert elements 7.
- the gas formation is ignited by means of UV light. If the material 4, 5, 6 is still pasty, the gas-forming insert elements 7 will trigger the formation of cavities 8 and form a multi-layer workpiece.
- the multi-layer workpiece has a double-corrugated inner composite with a smooth outer wall. The double wall provides security against leaks, increases thermal insulation and
- FIGS. 3A to 3C schematically show the process for the production of thermoplastic composite sheets.
- a thermoplastic preform is inserted between an upper sheet metal plate 34 and a lower sheet metal plate 35 (see FIG. 3A).
- This preform consists of an upper cover layer 4, the upper gas-forming insert elements 7a, the matrix material 5, the lower gas-forming insert elements 7b and the lower cover layer 6.
- FIG. 3B shows the thermoplastic composite sheet deformed in a die bending press, not shown, which is subsequently shown in FIG. 3C After initiation of gas formation and optional endothermic heat generation by the gas pressure, the matrix material 5 is thermoplastic deformed and the die is moved apart.
- FIGS. 4A to 4F schematically show the process for RFK vacuum molding or fiber spraying and pressing.
- a lower cover layer 4 is applied as a fiber-plastic layer 19 in the form of synthetic resin-impregnated fibers by means of a spray head 17 which is pivoted (see FIG. 4A).
- gas-forming insert elements 7a are placed (see FIG. 4B).
- the matrix material 5 is also introduced as a fiber spray 18 (see FIG. 4 C).
- the upper gas-forming insert elements 7b are then placed (see FIG. 4D).
- the upper cover layer 6 is injected (see FIG. 4E).
- the formula is now closed and pressed using a tool part 2.
- the air is extracted using a vacuum (film process).
- FIG. 4 F the upper tool part 2 is lifted off after uniform gas formation, and the matrix material 5, which has not yet hardened, is spatially deformed by the gas pressure.
- FIG. 4 H shows the workpiece removed after the plastic has hardened, with the upper cover layer 6, the matrix material 5 and the lower cover layer 4
- Cavities 9 remain the residues 12 of the gas-forming insert element 7. Thus, a lightweight workpiece with cavities can be produced in a simple manner.
- FIGS. 5A and 5B schematically show the sequence for injection molding in the co-injection process.
- the co-injection nozzle in FIG. 5A is drawn in three layers. 4 denotes the upper cover layer and 6 the lower cover layer.
- the middle nozzle injects the gas-forming insert elements 7 as part of a sprayable plastic.
- the intermediate layer in the form of insert elements 7 is pressed alternately between the cover layers 4, 6.
- a uniform flow of cover layers and insert elements 7 is formed, which flows between the tool parts 1 and 2.
- FIG. 5B after the gas formation has been initiated, the tool parts 1 and 2 are moved apart, which remains tight due to the formation of a plunge edge 11 on the tool part 1, so that the cavity formation 9 spatially deforms the matrix material 5 due to the internal gas pressure.
- the process is primarily used to use recycled materials.
- the use of plastic blowing agent below the reaction temperature and the targeted co-injection, optionally with an interruption of the injection, as well as subsequent triggering of the gas formation process and moving the tool parts 1, 2 apart when cooling results in an injection molding workpiece with a double wall and optionally with webs.
- FIGS. 6A and 6B schematically show the sequence for the injection molding in the “in mold coating” method
- Reaction temperature of the blowing agent is preheated, inserted into a tool part 2 and pressed by closing the tool part 2 and the core pull 3.
- the matrix material 5 is then sprayed from the side of the tool part onto the lacquer film 46 with gas-forming insert elements 7.
- the gas-forming insert pieces 7 are now heated and gas formation starts, so that the tool part 1 is opened in accordance with the desired bond strength during the expansion of the matrix material 5.
- FIGS. 7A and 7D schematically show the sequence for injection molding using the “net” preform insertion method.
- a prefabricated insert consisting of a network 13, on which gas-forming insert elements 7 arranged in a grid are applied, is inserted between the open tool parts 1, 2 (see FIG. 7A).
- the insert parts 7 of the net 13 come to rest between the tool parts 1 and 2, wherein advantageously a device for maintaining a distance creates a uniform distance between the inner wall of the tool parts 1, 2 and the net 13.
- the introduction of melt is shown in FIG. 7C.
- the injection nozzle 14 injects the plastic into the mold and, as the matrix material 5, flows around the gas-forming inserts 7, which are held by the mesh 13 at the intervals provided.
- the gas formation 8 is by z. B. initiated by pressure and / or temperature (see Figure 7D). After complete gas formation, the tool parts are moved apart, the tool parts 1, 2 remaining sealed by means of a plunge edge 11. Cavities 9 are formed, which are surrounded by plastically deformed plastic 15, which is formed from the matrix material 5.
- the gas-forming insert elements 7 can optionally be introduced in several planes to form spatially biaxially curved matrix materials 5 (egg-box shaped).
- FIGS. 8A and 8D schematically show the sequence for injection molding by means of the “prepreg” preform insertion method.
- a prefabricated insert consisting of a matrix material 5 is inserted between the open tool parts 1, 2.
- Gas-forming insert elements 7a arranged in a grid are applied to the left of the matrix material 5, and gas-forming insert elements 7b arranged in a staggered grid are applied to the right of the matrix material 5 (see FIG. 8A).
- These layers can optionally be carried out several times.
- the insert part becomes the contour of the mold adapted pressed and the right cover layer 6 injected into the mold by means of an injection nozzle 14a.
- the injection of the right cover layer 4 is shown in FIG. 8C.
- a hot melting plastic is advantageously injected, which, for example, triggers the gas formation by pressure and / or temperature (see FIG. 8D).
- the tool parts 1, 2 are moved apart, the tool parts remaining sealed by means of a diving edge 11.
- the workpiece now consists of the left cover layer 4, the matrix material 5, which is now spatially deformed by the gas pressure, and the right cover layer 6.
- FIGS. 9A and 9C schematically show the sequence for injection molding using gas pressure melting processes. After inserting the right cover layer 4 and the gas-forming insert elements 7, the tool parts 1 and 2 are closed (see FIG. 9A).
- FIG. 9B shows the injection process, the right cover layer 6 being injected via the injection nozzle 14. The gas formation is triggered by the temperature and / or pressure.
- FIG. 9C shows the reflux of the plastic melt 39 through the injection nozzle 14, so that the cavities 9 are created by the gas pressure.
- the plastic introduction of the gas-forming substances takes place in two-component machines by injection into the thermoplastic stream of the two plastic cover layers 4 and 6. According to the flow laws, the layers 32 are distributed in the tool parts 1 and 2 and form points with gas-forming properties 33.
- Insert elements 7 can, for. B. on two-color machines. Both the quantity and distance of the insert elements is controlled via the second component, or distributed by the injection nozzle according to position and quantity. The tool parts 1 and 2 are kept under pressure until all insertion elements 7 have been initiated in order to enable the cavities to be formed by subsequently opening the mold.
- FIGS. 11A to 11D schematically show the procedure for implanting gas-forming insertion elements 7.
- the tool part 1 is provided with numerous injection needles 20, which are displaceably arranged in the axial position (see FIG. 11A). Between the tool parts 1, 2, the matrix material 5 is a Injection nozzle 14 injected (see Figure 11 B). The injection needles 20 in the tool part 1 are inserted into the matrix material 5 (see FIG. 1C). The gas-forming insert elements 7 are optionally injected while the tool parts 1 and 2 are being moved apart and gas formation is triggered, for example, by pressure and / or temperature (see FIG. 11D). The injection needles 20 are retracted. After complete gas formation, the tool parts 1 and 2 are moved apart, the shape remaining tight by means of the plunge edge 11. Cavities 9 are formed, which are surrounded by plastically deformed plastic 15, which is formed from the matrix material 5. The injection needles 20 are inserted in multilevel cavity layers in the planes in corresponding different axial positions.
- FIG. 12 schematically shows the sequence for a jacketed implantation of gas-forming insert elements.
- Another form of implantation of gas-forming insert elements is shown in FIG.
- the injection needle consists of two concentric tubes.
- the inner tube 45 and the outer tube 42 are inserted into the matrix material 5.
- a tougher, lower-melting plastic 41 than the matrix material 5 is injected through the space between the outer and inner tubes 43.
- the gas-forming insert element is injected through the inner tube 44 into the enveloping bladder 41.
- the injection needles are then withdrawn, so that a bubble of gas-forming substances is covered with a tough plastic.
- FIGS. 13A and 13C schematically show the sequence for a back injection molding process.
- the tool part 1 is to be back-injected
- FIGS. 14A and 14B schematically show the sequence for the “reinforcement” method.
- FIG. 14A and 14B schematically show the sequence for the “reinforcement” method.
- FIG. 14A a single-layer gas-forming layer of insert elements 7 is enclosed by means of a reinforcement in the form of fabric threads.
- the first reinforcement layer 36 alternately wraps around the insert elements 7, while the second reinforcement layer comes to lie on the other side of the insert elements 7.
- the outer layers 4 and 6 can then optionally be applied.
- FIG. 14B shows a two-layer gas-forming insert layer 7a and 7b. Both layers enclose the matrix material 5.
- the first reinforcement layer 36 alternately wraps around the second reinforcement layer 37 and alternately the third reinforcement layer 38.
- the cover layers 4 and 6 are optionally applied.
- FIGS. 15A to 15C schematically show the sequence for the "thermoplastic forming" method using a 4-layer workpiece with 3 layers of gas-forming inserts 7a to 7c.
- the upper cover layer 4 and the upper matrix material 5a enclose the gas-forming upper insert elements 7a.
- the gas-forming middle insert elements 7b lie between the matrix materials 5a and 5b.
- And between the matrix material 5b and the lower cover layer 6 are the lower gas-forming insert elements 7c.
- the thermally deformed matrix materials 5a and 5b are created by the internal gas pressure initiated from outside and the cover layers 4, 6 being moved apart, so that the workpiece is formed in FIG. 15C and has high strength after cooling.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT128497 | 1997-07-29 | ||
AT128497 | 1997-07-29 | ||
PCT/DE1998/002205 WO1999006200A1 (en) | 1997-07-29 | 1998-07-29 | Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1009608A1 true EP1009608A1 (en) | 2000-06-21 |
Family
ID=3510564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98946251A Withdrawn EP1009608A1 (en) | 1997-07-29 | 1998-07-29 | Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities |
Country Status (7)
Country | Link |
---|---|
US (2) | US6447627B1 (en) |
EP (1) | EP1009608A1 (en) |
JP (1) | JP2001512059A (en) |
AU (1) | AU9337498A (en) |
CA (1) | CA2297934C (en) |
DE (1) | DE19881053D2 (en) |
WO (1) | WO1999006200A1 (en) |
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CA2364241C (en) * | 1999-02-25 | 2009-06-02 | Supracor, Inc. | Saddle pad and method of making same |
JP2002340280A (en) * | 2001-05-18 | 2002-11-27 | Jamco Corp | Vacuum insulating block |
DE10340608A1 (en) * | 2003-08-29 | 2005-03-24 | Infineon Technologies Ag | Polymer formulation and method of making a dielectric layer |
WO2006080833A1 (en) * | 2005-01-31 | 2006-08-03 | Fits Holding Bv | Method of manufacturing a sandwich panel and a sandwich panel as such |
US20100178182A1 (en) * | 2009-01-09 | 2010-07-15 | Simmons Tom M | Helical bellows, pump including same and method of bellows fabrication |
US8636484B2 (en) * | 2009-01-09 | 2014-01-28 | Tom M. Simmons | Bellows plungers having one or more helically extending features, pumps including such bellows plungers, and related methods |
WO2011035352A1 (en) | 2009-09-24 | 2011-03-31 | Siegfried Berghammer | Insulating molded part and method for the production thereof |
US8361266B2 (en) * | 2010-11-15 | 2013-01-29 | Colchiesqui Alexandre Viana | Layered molding process for producing three dimensional objects |
AT516767B1 (en) * | 2015-01-22 | 2017-01-15 | Profeta Da Silva Alois | Process for producing a fiber-matrix semifinished product |
WO2018028791A1 (en) * | 2016-08-11 | 2018-02-15 | LIEMT, Rainer | Method for producing a fibre matrix semi-finished product |
US11365543B2 (en) | 2017-04-24 | 2022-06-21 | Rigidcore Group Llc | Sheet material, mold, and methods of making and using the sheet material and mold |
DE102018203726A1 (en) * | 2018-03-13 | 2019-09-19 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a sandwich component |
MX2020011213A (en) | 2018-04-23 | 2020-11-09 | Rigidcore Group Llc | Fastening system, and methods of making and using the system. |
US11325281B2 (en) | 2018-07-23 | 2022-05-10 | Ut-Battelle, Llc | Rapid manufacturing of tailored preforms |
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US3615972A (en) * | 1967-04-28 | 1971-10-26 | Dow Chemical Co | Expansible thermoplastic polymer particles containing volatile fluid foaming agent and method of foaming the same |
US4247586A (en) * | 1979-07-16 | 1981-01-27 | Morris Rochlin | Noise reducing liner panels for vehicles |
SE439599B (en) * | 1981-01-14 | 1985-06-24 | Kema Nord Ab | WAY TO DRY AND EXPAND IN LIQUID DISPERSED, THERMOPLASTIC MICROSPHERES CONTAINING, VOLTABLE, LIQUID JEWELERY |
NO163087C (en) | 1983-09-03 | 1990-04-04 | Hennecke Gmbh Maschf | MULTIPLE MATERIAL NOZZLE FOR COMBINING AT LEAST TWO FLOWABLE REACTION COMPONENTS FOR THE PREPARATION OF A FLOWABLE, FOR ARTIFICIAL, SPECIFICALLY FOR FOAM, EXTENDING REACTION MIXTURE. |
US4843104A (en) * | 1987-03-19 | 1989-06-27 | Pierce & Stevens | Syntactic polymer foam compositions containing microsphere fillers |
JPH02178012A (en) | 1988-12-29 | 1990-07-11 | Nissei Plastics Ind Co | Injection mold assembly |
US5244613A (en) * | 1993-01-21 | 1993-09-14 | Miles Inc. | Process for the production of reinforced moldings and the resultant products |
EP0679501A1 (en) * | 1994-03-14 | 1995-11-02 | YMOS AKTIENGESELLSCHAFT Industrieprodukte | Composite material with foamable core |
JPH106363A (en) | 1996-06-21 | 1998-01-13 | Sunstar Inc | Injection molding machine |
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1998
- 1998-07-29 EP EP98946251A patent/EP1009608A1/en not_active Withdrawn
- 1998-07-29 JP JP2000504992A patent/JP2001512059A/en not_active Ceased
- 1998-07-29 CA CA002297934A patent/CA2297934C/en not_active Expired - Fee Related
- 1998-07-29 AU AU93374/98A patent/AU9337498A/en not_active Abandoned
- 1998-07-29 US US09/462,196 patent/US6447627B1/en not_active Expired - Fee Related
- 1998-07-29 WO PCT/DE1998/002205 patent/WO1999006200A1/en not_active Application Discontinuation
- 1998-07-29 DE DE19881053T patent/DE19881053D2/en not_active Expired - Fee Related
-
2002
- 2002-06-07 US US10/164,547 patent/US6875298B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO9906200A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6447627B1 (en) | 2002-09-10 |
JP2001512059A (en) | 2001-08-21 |
AU9337498A (en) | 1999-02-22 |
CA2297934A1 (en) | 1999-02-11 |
US20020157758A1 (en) | 2002-10-31 |
WO1999006200A1 (en) | 1999-02-11 |
CA2297934C (en) | 2007-12-11 |
US6875298B2 (en) | 2005-04-05 |
DE19881053D2 (en) | 2000-07-06 |
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