DE19647071A1 - Long fibre, especially glass fibre, reinforced thermoplastic product manufacture - Google Patents

Long fibre, especially glass fibre, reinforced thermoplastic product manufacture

Info

Publication number
DE19647071A1
DE19647071A1 DE19647071A DE19647071A DE19647071A1 DE 19647071 A1 DE19647071 A1 DE 19647071A1 DE 19647071 A DE19647071 A DE 19647071A DE 19647071 A DE19647071 A DE 19647071A DE 19647071 A1 DE19647071 A1 DE 19647071A1
Authority
DE
Germany
Prior art keywords
tool
thermoplastic
matrix
moulding
fibre
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
DE19647071A
Other languages
German (de)
Other versions
DE19647071B4 (en
Inventor
Gerd Ehnert
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.)
Menzolit Fibron GmbH
Original Assignee
Menzolit Fibron GmbH
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 Menzolit Fibron GmbH filed Critical Menzolit Fibron GmbH
Priority to DE19647071A priority Critical patent/DE19647071B4/en
Publication of DE19647071A1 publication Critical patent/DE19647071A1/en
Application granted granted Critical
Publication of DE19647071B4 publication Critical patent/DE19647071B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/52Heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/54Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16Cooling
    • B29C2035/1658Cooling using gas
    • B29C2035/1675Cooling using gas other than air
    • B29C2035/1683Cooling using gas other than air inert gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/02Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • B29C33/046Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam using gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B29C43/183Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2101/00Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12Thermoplastic materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037Other properties
    • B29K2995/0049Heat shrinkable

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

A process for manufacturing a long fibre, preferably glass fibre, reinforced thermoplastic component involves: (a) moulding the thermoplastic matrix with fibres between the upper (1) and lower (2) parts of a tool by compression and flow moulding, the temperature of the upper part being above and the temperature of the lower part (2) below the melting point of the thermoplastic; (b) moving the upper tool part away from the lower part and allowing the recovery of the fibre structure to create an expanded product; (c) rapidly freezing the walls of the product by injecting liquid nitrogen into the hot matrix. Preferably a combined moulding and cooling tool (4) is introduced between the tool halves (1,2) after initial moulding and has separate nozzles for injecting and removing liquid nitrogen. In a process variation a moulded component (7) is placed in the tool (1,2) instead of the thermoplastic matrix and a localised area is heated to induce expansion of the fibres structure prior to freezing. A further variation of the process involves locating a moulded component in the tool (1,2), placing a thermoplastic with an expanded fibre structure on top and shaping with the moulding and cooling tool while fusing onto the moulded product. Alternative fibres may be made of thermoplastic.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Formteils aus einem langfa­ serverstärkten, vorzugsweise glasfaserverstärkten Thermoplast nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing a molded part from a Langfa server-strengthened, preferably glass-fiber reinforced thermoplastic according to the generic term of claim 1.

Langfaserverstärkte Thermoplaste werden in zunehmendem Umfang für die verschie­ densten Anwendungsfälle verwendet. Diese sind z. B. LKW-Einstiege, Kotflügel, Stoßfänger, Montageträger, Außenhautbauteile oder Innenverkleidungen für Kraft­ fahrzeuge, Leuchtengehäuse und Schaltschränke für die Elektroindustrie und Ventila­ torenverkleidungen oder Schrankseitenteile für den Getränke-Apparatebau, um nur einige zu nennen.Long fiber reinforced thermoplastics are increasingly used for the various most use cases. These are e.g. B. truck entrances, fenders, Bumpers, mounting brackets, skin components or inner panels for power vehicles, luminaire housings and control cabinets for the electrical industry and Ventila door cladding or cabinet side parts for beverage apparatus construction, only to name a few.

Seit einiger Zeit ist es bekannt, daß langfaserverstärkte Thermoplaste ihren bei der Formteilherstellung unter Druck verdichteten und eingefrorenen Materialquerschnitt durch Wiedererwärmung oberhalb der Schmelztemperatur des Thermoplasts verän­ dern. Dies kommt daher, daß bei Erwärmung der thermoplastischen Matrix über die Schmelztemperatur sich die unter Druck zwangsweise gebogenen Langfasern durch die in ihnen vorhandenen Rückstellkräfte wieder aufzurichten versuchen. Die mit der thermoplastischen Matrix benetzten Langfasern verbinden und fixieren diese luftige Faserstruktur untereinander beim anschließenden Abkühlen unter die Schmelztempe­ ratur.It has been known for some time that long fiber reinforced thermoplastics are used in the Molding production under pressure compressed and frozen material cross section by reheating above the melting temperature of the thermoplastic other. This is because when the thermoplastic matrix is heated, the Melting temperature, the long fibers forced under pressure try to restore the restoring forces in them. The one with the Thermoplastic matrix wetted long fibers connect and fix these airy Fiber structure with each other during the subsequent cooling below the melting temperature maturity.

Diese eingefrorene luftige Faserstruktur hat gute Geräuschdämpfungseigenschaften, die vergleichbar einem auf PUR-Basis hergestellten Schaumstoff zur Geräuschab­ sorption sind. Dadurch bietet sich die Möglichkeit, Geräuschabschirmungen aus ei­ nem einzigen Werkstoff und in einem Arbeitsgang herzustellen. Neben den Kosten­ vorteilen für die Herstellung einer Geräuschabschirmung sind die Formteile problem­ los recycelbar, da sie aus einem einheitlichen Werkstoff bestehen. This frozen airy fiber structure has good noise damping properties, which is comparable to a foam based on PUR for noise reduction sorption are. This offers the possibility of making noise shields from egg one material and in one operation. In addition to the cost Advantages for the production of a noise shield are the molded parts problem ready to be recycled as they are made of a uniform material.  

Der Verfahrensablauf nach dem Stand der Technik sieht folgendermaßen aus:
Der langfaserverstärkte Thermoplast wird über die Matrixschmelztemperatur erwärmt und in einem Werkzeug durch Form- oder Fließpressen verformt. Die Werkzeugtem­ peraturen liegen im Oberwerkzeug über der Matrixschmelztemperatur und im Unter­ werkzeug unter der Matrixschmelztemperatur. Entsprechend der gewünschten einzu­ frierenden konsolidierten Wanddicke wird das Werkzeug über einen bestimmten Zeit­ raum geschlossen gehalten. Beim Öffnen, d. h. Entlasten des Werkstoffes, entsteht in der noch heißen Matrix durch das Rückstellvermögen der Glasfasern eine luftige Fa­ serstruktur.
The process flow according to the prior art looks as follows:
The long fiber reinforced thermoplastic is heated above the matrix melting temperature and shaped in a mold by compression molding or extrusion. The tool temperatures are above the matrix melting temperature in the upper tool and below the matrix melting temperature in the lower tool. Depending on the desired consolidated wall thickness to be frozen, the tool is kept closed for a certain period of time. When opening, ie relieving the load on the material, the resilience of the glass fibers creates an airy fiber structure in the still hot matrix.

Das Abkühlen der luftigen Faserstruktur erfolgt aufgrund der schlechten Wärmeleitfä­ higkeit sehr langsam und kann sich über mehrere Minuten erstrecken. Folge der lang­ samen Abkühlung ist das Einsetzen der Oxidation der Matrix durch den vorhandenen Luftsauerstoff. Der Oxidationsvorgang, der unter exothermer Wärmeentwicklung statt­ findet, kann sich bis zur Selbstentzündung der Matrix hochschaukeln.The airy fiber structure cools down due to the poor thermal conductivity ability is very slow and can take several minutes. Follow the long seed cooling is the onset of oxidation of the matrix by the existing one Atmospheric oxygen. The oxidation process that takes place under exothermic heat finds, can rock up to the self-ignition of the matrix.

Um die Oxidation der Matrix zu vermeiden und kurze Zykluszeiten zu ermöglichen, wurden verschiedene Abkühlmethoden bewertet. Das Abkühlen im Wasserbad schei­ det wegen der offenen Faserstruktur aus, da Wasser anschließend mit großem Auf­ wand wieder entfernt werden müßte. Eine alternative Kühlmethode mußte gefunden werden.To avoid oxidation of the matrix and to enable short cycle times, different cooling methods were evaluated. Cool down in a water bath det because of the open fiber structure, because water then with a big open wall would have to be removed again. An alternative cooling method had to be found will.

Erfindungsgemäß wird dies dadurch erreicht, daß nach dem Abheben des Oberteils vom Unterteil in die noch heiße Matrix flüssiger Stickstoff injiziert wird, d. h. nach der Verformung des Compounds öffnet das Werkzeug und die Glasfasern bzw. Langfa­ sern stellen sich auf. In diese noch heiße Matrix wird flüssiger Stickstoff injiziert. Der flüssige Stickstoff geht dabei in den gasförmigen Zustand über und vergrößert sein Volumen um das 1056-fache. Die Volumenvergrößerung wird auch zur Unterstützung des Rückstellvermögens der Glasfasern miteingesetzt. Die tiefen Temperaturen des flüssigen Stickstoffs (- 195,8°C) werden für die Abkühlung der Matrix genutzt. According to the invention this is achieved in that after lifting off the upper part liquid nitrogen is injected from the lower part into the still hot matrix, d. H. after Deformation of the compound opens the tool and the glass fibers or Langfa line up. Liquid nitrogen is injected into this still hot matrix. Of the liquid nitrogen changes to the gaseous state and can be enlarged Volume 1056 times. The volume increase is also used as a support of the resilience of the glass fibers. The low temperatures of the liquid nitrogen (- 195.8 ° C) are used to cool the matrix.  

In bevorzugter Ausführungsform wird zwischen die geöffneten Werkzeughälften eine Form- und Abkühlvorrichtung eingebracht, die Zufuhrdüsen zum Einleiten des flüssi­ gen Stickstoffs und Ableitdüsen zum Abführen des eingeleiteten Stickstoffs aufweist.In a preferred embodiment, a is between the opened tool halves Forming and cooling device introduced, the feed nozzles for introducing the liquid gene nitrogen and discharge nozzles for discharging the introduced nitrogen.

Mit dieser Form- und Abkühlvorrichtung wird das Formteil sowohl geformt, als auch die Abkühlzeit der flüssigen Matrix beschleunigt.With this molding and cooling device, the molding is both molded and the cooling time of the liquid matrix is accelerated.

Zweckmäßigerweise kann auch anstelle des Thermoplasts ein fertiges Formteil in das Werkzeug eingelegt werden. Dieses wird dann mit Hilfe des beschriebenen Verfah­ rens teilweise wieder aufgeschmolzen und erhält so an den gewünschten Stellen eine luftige Faserstruktur.A finished molded part can expediently also be placed in the place of the thermoplastic Tools are inserted. This is then done using the procedure described partially melted again and thus receives one at the desired points airy fiber structure.

Ebenso kann auch ein fertiges Formteil in das Werkzeug eingelegt und darauf ein Thermoplast mit luftiger Faserstruktur aufgeschmolzen werden.A finished molded part can also be inserted into the tool and placed on it Thermoplastic with an airy fiber structure can be melted.

Bevorzugt sind Langfaserthermoplaste.Long fiber thermoplastics are preferred.

Weitere Merkmale der Erfindung ergeben sich aus den Figuren, die nachfolgend be­ schrieben sind. Es zeigt:Further features of the invention emerge from the figures, which are below are written. It shows:

Fig. 1, A-E ein erfindungsgemäßes Verfahren zur Herstellung eines Formteils mit luftiger Faserstruktur, Fig. 1, AE, an inventive method for producing a molded part with an airy fiber structure,

Fig. 2, A-E ein erfindungsgemäßes Verfahren, bei dem anstelle des Thermoplasts ein fertiges Formteil in das Werkzeug gelegt wird und Fig. 2, AE an inventive method in which a finished molded part is placed in the tool instead of the thermoplastic and

Fig. 3, A-F ein erfindungsgemäßes Verfahren, bei dem auf ein fertiges Formteil ein Thermoplast mit luftiger Faserstruktur aufgeschmolzen wird. Fig. 3, AF an inventive method in which a finished molding a thermoplastic is melted with lofty fibrous structure.

Fig. 1, A-E zeigt schematisiert ein erfindungsgemäßes Verfahren zur Herstellung ei­ nes Formteils mit einer luftigen Faserstruktur. Fig. 1A zeigt schematisiert die drei hierzu benötigten Werkzeuge, nämlich ein Oberteil 1 und ein Unterteil 2 eines Form­ werkzeuges, wobei die Werkzeugtemperatur des Oberteils 1 über der Matrixschmelz­ temperatur des zu verarbeitenden glasfaserverstärkten Thermoplasts und die Werk­ zeugtemperatur des Unterteils 2 unter der Matrixschmelztemperatur des Thermoplasts liegen. Eine Form- und Abkühlvorrichtung 4 ist noch außerhalb des Werkzeugs 1, 2 angeordnet. In dieser Form- und Abkühlvorrichtung 4 sind Zuführdüsen 5 zum Einlei­ ten von flüssigem Stickstoff und Ableitdüsen 6 zum Abführen des eingeleiteten Stick­ stoffs enthalten. Fig. 1, AE shows schematically an inventive method for producing egg nes molding with a lofty fibrous structure. Fig. 1A schematically shows the three required for this purpose tools, namely an upper part 1 and a lower part 2 of a mold, wherein the mold temperature of the upper part 1 temperature above the matrix melting of the processed glass fiber reinforced thermoplastic material and the tools temperature of the lower part 2 below the matrix melting temperature of the thermoplastic lie. A molding and cooling device 4 is still arranged outside the tool 1 , 2 . In this molding and cooling device 4 , feed nozzles 5 for introducing liquid nitrogen and discharge nozzles 6 for discharging the introduced nitrogen are contained.

Fig. 1B zeigt den eigentlichen Preßvorgang, der aus dem Thermoplast 3 (siehe Fig. 1 A) ein Formteil formt. Nach dem Preßvorgang werden die beiden Werkzeugteile 1, 2 geöffnet und es wird die unterhalb der Matrixschmelztemperatur des Thermoplasts temperierte Form- und Abkühlvorrichtung 4 eingebracht. Mit dieser Form- und Abkühl­ vorrichtung 4 können Formteilbereiche wieder konsolidiert und eingefroren werden, die mit der Oberfläche der Form- und Abkühlvorrichtung 4 in Berührung kommen. In den ausgesparten Formteilbereichen findet keine Konsolidierung statt. Zur Temperie­ rung wird flüssiger Stickstoff in die Matrix injiziert. Mit flüssigem Stickstoff ist hier auch kaltes Stickstoffgas gemeint. Die Injizierung erfolgt über die Zuführdüsen 5 und Ab­ leitdüsen 6 (siehe Fig. 1D), die aus der Form- und Abkühlvorrichtung 4 herausragen und in die Matrix führen. Die Form- und Abkühlvorrichtung 4 hat eine Kontur, die dem fertigen Formteil entspricht. FIG. 1B shows the actual pressing operation, which (see Fig. 1 A) of the thermoplastic material 3 forms a molded part. After the pressing process, the two tool parts 1 , 2 are opened and the molding and cooling device 4 , which is tempered below the matrix melting temperature of the thermoplastic, is introduced. With this molding and cooling device 4 molding areas can be consolidated and frozen again, which come into contact with the surface of the molding and cooling device 4 . There is no consolidation in the recessed molding areas. Liquid nitrogen is injected into the matrix for temperature control. Liquid nitrogen here also means cold nitrogen gas. The injection takes place via the feed nozzles 5 and from the guide nozzles 6 (see FIG. 1D) which protrude from the molding and cooling device 4 and lead into the matrix. The molding and cooling device 4 has a contour that corresponds to the finished molded part.

Fig. 1E zeigt das Herausnehmen der Form- und Abkühlvorrichtung 4 und das Her­ ausnehmen des fertigen Formteils mit einer luftigen Faserstruktur. FIG. 1E shows the removal of the mold and cooling device 4 and the Her exclude the finished molded part with an airy fiber structure.

Fig. 2A bis E zeigt ein erfindungsgemäßes Verfahren, bei dem in einem zweiten Ar­ beitsgang an einem fertigen Formteil das Rückstellvermögen der Glasfasern durch Wiedererwärmen von Formteilbereichen eingeleitet wird. Fig. 2A zeigt ein fertiges Formteil 7 vor der Bearbeitung. Fig. 2B zeigt das Wiedererwärmen des Formteils 7. In Fig. 2C ist das Oberteil 1 vom Unterteil 2 des Werkzeugs getrennt und es wird die Form- und Abkühlvorrichtung 4 eingebracht. Fig. 2D zeigt das Injizieren des flüssigen Stickstoffs über die Form- und Abkühlvorrichtung 4. Nach dem Abkühlvorgang wird die Form- und Abkühlvorrichtung 4 wieder aus dem Werkzeug 1, 2 entfernt (siehe Fig. 2E) und das Formteil 7 mit nachträglich hergestellter luftiger Faserstruktur kann aus dem Werkzeug genommen werden. FIGS. 2A-E shows an inventive method in which the second in an Ar beitsgang in a finished molding, the resiliency of the glass fibers by reheating of mold portions is initiated. Fig. 2A shows a finished mold part 7 before processing. Fig. 2B shows the reheating of the mold part 7. In Fig. 2C the top part 1 is separated from the lower part 2 of the tool and it is introduced the forming and cooling device. 4 Fig. 2D shows the injection of the liquid nitrogen over the mold and cooling device. 4 After the cooling process, the molding and cooling device 4 is removed again from the tool 1 , 2 (see FIG. 2E) and the molded part 7 with a subsequently produced airy fiber structure can be removed from the tool.

In Fig. 3 A-F ist gezeigt, wie in ein fertiges Formteil heißes Thermoplast (Compound) eingelegt wird und mit der Form- und Abkühlvorrichtung 4, ähnlich wie schon be­ schrieben, in Kontur gebracht und abgekühlt wird. In den Fig. 3, A-B ist die Form­ teilherstellung nach dem Stand der Technik gezeigt. Nach dem Öffnen des Werk­ zeugs wird Thermoplast 3 in das fertige Formteil 7 eingelegt und anschließend die Form- und Abkühlvorrichtung 4 eingesetzt (Fig. 3, C-D). Fig. 3E zeigt das Formen und Abkühlen und Fig. 3F das Öffnen und Entfernen der Form- und Abkühlvorrich­ tung 4 und das Herausnehmen des fertigen Formteils.In Fig. 3 AF is shown how hot thermoplastic (compound) is inserted into a finished molding and with the molding and cooling device 4 , similar to what has already been described, brought into contour and cooled. In Figs. 3, AB, the shape is part of manufacture shown in the prior art. After opening the tool, thermoplastic 3 is inserted into the finished molded part 7 and then the molding and cooling device 4 is used ( Fig. 3, CD). Fig. 3E shows the molding and cooling and Fig. 3F, the opening and removal of the mold and Abkühlvorrich tung 4 and removal of the finished molding.

Claims (5)

1. Verfahren zur Herstellung eines Formteils aus einem langfaserverstärkten, vor­ zugsweise glasfaserverstärkten Thermoplast, wobei
  • - das Thermoplast in einem Werkzeug bestehend aus einem Ober- (1) und Un­ terteil (2) durch Form- und Fließpressen verformt wird,
  • - die Werkzeugtemperaturen des Oberteils (1) über der Matrixschmelztempera­ tur und des Unterteils (2) unter der Matrixschmelztemperatur des Thermoplasts (3) liegen und
  • - nach dem Form- und Fließpressen das Oberteil (1) vom Unterteil (2) abgeho­ ben wird, so daß sich in der noch heißen Matrix des Thermoplasts (3) durch das Rückstellvermögen der Langfasern eine luftige Faserstruktur ausbildet, dadurch gekennzeichnet, daß nach dem Abheben des Oberteils (1) vom Unter­ teil (2) in die noch heiße Matrix flüssiger Stickstoff injiziert wird.
1. A method for producing a molded part from a long fiber reinforced, preferably glass fiber reinforced thermoplastic, wherein
  • - The thermoplastic is deformed in a tool consisting of an upper ( 1 ) and lower ( 2 ) part by molding and extrusion,
  • - The tool temperatures of the upper part ( 1 ) above the Matrixschmelztempera and the lower part ( 2 ) below the matrix melting temperature of the thermoplastic ( 3 ) and
  • - After the compression and extrusion, the upper part ( 1 ) is removed from the lower part ( 2 ), so that an airy fiber structure is formed in the still hot matrix of the thermoplastic ( 3 ) by the resilience of the long fibers, characterized in that after Lifting the upper part ( 1 ) from the lower part ( 2 ) into the still hot matrix liquid nitrogen is injected.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zwischen die geöffne­ ten Werkzeughälften (1, 2) eine Form- und Abkühlvorrichtung (4) eingebracht wird, die Zuführdüsen (5) zum Einleiten des flüssigen Stickstoffs und Ableitdüsen (6) zum Abführen des eingeleiteten Stickstoffs aufweist.2. The method according to claim 1, characterized in that between the Geöffne th tool halves ( 1 , 2 ) a molding and cooling device ( 4 ) is introduced, the feed nozzles ( 5 ) for introducing the liquid nitrogen and discharge nozzles ( 6 ) for removing the introduced nitrogen. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß anstelle des Thermoplasts (4) ein fertiges Formteil (7) in das Werkzeug (1, 2) gelegt wird.3. The method according to claim 1 or 2, characterized in that a finished molded part ( 7 ) is placed in the tool ( 1 , 2 ) instead of the thermoplastic ( 4 ). 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein fertiges Formteil (7) in das Werkzeug (1, 2) eingelegt und darauf ein Thermo­ plast (3) mit luftiger Faserstruktur aufgeschmolzen wird.4. The method according to any one of claims 1 to 3, characterized in that a finished molded part ( 7 ) is inserted into the tool ( 1 , 2 ) and a thermoplastic ( 3 ) with an airy fiber structure is melted thereon. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Langfasern Thermoplaste sind.5. The method according to any one of claims 1 to 4, characterized in that the Long fibers are thermoplastics.
DE19647071A 1996-07-17 1996-11-14 Process for the production of a molding from a long fiber reinforced thermoplastic Expired - Fee Related DE19647071B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19647071A DE19647071B4 (en) 1996-07-17 1996-11-14 Process for the production of a molding from a long fiber reinforced thermoplastic

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19628848 1996-07-17
DE19628848.7 1996-07-17
DE19647071A DE19647071B4 (en) 1996-07-17 1996-11-14 Process for the production of a molding from a long fiber reinforced thermoplastic

Publications (2)

Publication Number Publication Date
DE19647071A1 true DE19647071A1 (en) 1998-01-22
DE19647071B4 DE19647071B4 (en) 2005-10-27

Family

ID=7800094

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19647071A Expired - Fee Related DE19647071B4 (en) 1996-07-17 1996-11-14 Process for the production of a molding from a long fiber reinforced thermoplastic

Country Status (1)

Country Link
DE (1) DE19647071B4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115923051A (en) * 2022-12-06 2023-04-07 南通超达装备股份有限公司 Injection molding mold for automotive interior trim panel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2007362A1 (en) * 1969-02-20 1970-09-24 Union Carbide Corp., New York, N.Y. (V.St.A.) Process for making molded articles from thermoplastic synthetic resin and fiberglass
DE2007370A1 (en) * 1969-02-20 1970-12-23 Union Carbide Corp., New York, N.Y. (V.St.A.) Structure made from a punched blank made of fiberglass and thermoplastic synthetic resin and method for producing such a structure or blank
US5080742A (en) * 1988-09-30 1992-01-14 Tama Kasei Co., Ltd. Process for manufacture of article having embossed plastic sheet covering
WO1992000839A1 (en) * 1985-06-11 1992-01-23 M.A. Industries, Inc. Manufacture of plastic products
DE4211669C1 (en) * 1992-04-07 1993-08-19 Continental Aktiengesellschaft, 3000 Hannover, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2007362A1 (en) * 1969-02-20 1970-09-24 Union Carbide Corp., New York, N.Y. (V.St.A.) Process for making molded articles from thermoplastic synthetic resin and fiberglass
DE2007370A1 (en) * 1969-02-20 1970-12-23 Union Carbide Corp., New York, N.Y. (V.St.A.) Structure made from a punched blank made of fiberglass and thermoplastic synthetic resin and method for producing such a structure or blank
WO1992000839A1 (en) * 1985-06-11 1992-01-23 M.A. Industries, Inc. Manufacture of plastic products
US5080742A (en) * 1988-09-30 1992-01-14 Tama Kasei Co., Ltd. Process for manufacture of article having embossed plastic sheet covering
DE4211669C1 (en) * 1992-04-07 1993-08-19 Continental Aktiengesellschaft, 3000 Hannover, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115923051A (en) * 2022-12-06 2023-04-07 南通超达装备股份有限公司 Injection molding mold for automotive interior trim panel
CN115923051B (en) * 2022-12-06 2023-09-05 南通超达装备股份有限公司 Injection molding die for automobile interior trim panel

Also Published As

Publication number Publication date
DE19647071B4 (en) 2005-10-27

Similar Documents

Publication Publication Date Title
EP0713755B1 (en) Method and apparatus for the production of plastic pieces
WO2004024426A1 (en) Method for the production of structural components from fiber-reinforced thermoplastic material
WO2001087568A1 (en) Method and device for making a cast part from a plastic/metal compound and device use
DE102012010469A1 (en) Method for manufacturing fiber reinforced component, involves arranging pre-mold semi-finished material with moderate temperature shell elements in tool to be provided with plastic material, where fiber reinforced component is cured
DE19647071A1 (en) Long fibre, especially glass fibre, reinforced thermoplastic product manufacture
EP0720528B1 (en) Process for making articles from epp foam
DE4416371A1 (en) Production of long porous metal profiles
DE2713527A1 (en) Vacuum drawing of fibrous mouldings, avoiding cracks and tears - by using a stabilising cover which absorbs tensile stresses
DE102012104316A1 (en) Method for manufacturing fiber composite material component using shaping tool, involves pressurizing semi-finished material such that component different structures are set with different mechanical properties over component thickness
DE4325559C2 (en) Process for producing blow molded plastic parts
DE2730667C3 (en) Process for the production of a fiber-reinforced pressure vessel
DE102010051047A1 (en) Method for tempering a mold
DE4033438C1 (en)
DE2520497B2 (en) PROCESS FOR PRODUCING A MOLDED BODY FROM THERMOPLASTIC HIGH MOLECULAR MATERIAL
DE4012851C2 (en)
DE4204627A1 (en) Hollow plastic automobile sun visor support with compound bends - is formed as single injection moulding by using core of pressurised gas or of low melting point alloy
DE4028215A1 (en) SYSTEM FOR THE PRODUCTION OF AXLE SPRINGS, AXLE STEERING CORE OR THE LIKE VEHICLE COMPONENTS
EP1301329B1 (en) Method for the production of a plastic blown piece with an internal reinforcement and plastic blown piece comprising two blown piece-halves
DE2624432A1 (en) Blowing of hollow thermoplastic articles - at temp. allowing biaxial drawing during whole deformation process
DE102015201497B4 (en) Preform system for an injection molded part and method for arranging at least one preform on an injection molded part
DE102019123084A1 (en) Method and device
DE2304309C3 (en) Process for the production of molded bodies with a profiled surface consisting of a mixture of comminuted fibrous materials and a binding agent
DE102020204875A1 (en) Process for the production of a particle foam molding
DE4405493A1 (en) Filler for the production of hollow body cores and process for the production of moldings
DE102019215997A1 (en) Process for the production of a coated support element made of elastomer material

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: B29C 4352

8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee