DE2157921A1 - Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds - Google Patents

Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds

Info

Publication number
DE2157921A1
DE2157921A1 DE2157921A DE2157921A DE2157921A1 DE 2157921 A1 DE2157921 A1 DE 2157921A1 DE 2157921 A DE2157921 A DE 2157921A DE 2157921 A DE2157921 A DE 2157921A DE 2157921 A1 DE2157921 A1 DE 2157921A1
Authority
DE
Germany
Prior art keywords
spraying
pressureless
reinforced
polyurethane foam
glass 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.)
Pending
Application number
DE2157921A
Other languages
German (de)
Inventor
Joachim Ruhnau
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE2157921A priority Critical patent/DE2157921A1/en
Publication of DE2157921A1 publication Critical patent/DE2157921A1/en
Pending legal-status Critical Current

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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • B29C44/0476—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other by pouring more than one composition into an open mould
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
    • 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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • 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
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The foam is sprayed into the mould without static stress using only the actual weigth of the foam. Pref. fibre glass chips are added to the foam during the spraying process. Different foams with different properties and densities can be aded during the spraying process.

Description

Verfahren zur drucklosen Herstellung von glasfaserverstärkten Polyurethan-Teilen Bis jetzt sind Verfahren bekannt, nach denen Formteile in geschlossenen Formen hergestellt werden, in die Polyurethan injiziert wird und die bei Ausdehnung des Schaumes die Konturen des Formteiles annehmen. Dieses hat sehr aufwendige Formen zur Folge und bedurfte vor allem bei größeren Formteilen sehr langer Aushärtzeiten.Process for the pressureless production of glass fiber reinforced polyurethane parts Up to now, methods are known by which molded parts are produced in closed molds into which polyurethane is injected and which, when the foam expands, die Take on the contours of the molded part. This results in very complex forms and Required very long curing times, especially for larger molded parts.

Dieses erfindungsgemäße Verfahren ermöglicht weniger aufwendige Negativ-Formen, in die der Schaum im Spru~hverfahren unter gleichzeitiger Zugabe von Glasseidenschnitzeln aufgebracht wird, Früher war es zwar auch schon möglich, Abdrücke durch Besprühen einer Form mit PU zu gewinnen, jedoch war wegen der geringen Oberflächenhärte und mangelnder Verwindungssteifigkeit die Herstellung von größeren Konstruktionsteilen nicht möglich.-Dieses Verfahren bringt den Vorteil, daß selbst größte Konstruktionsteile im Sprühverfahren hergestellt werden können, wobei mit Hilfe von zunächst aufgebrachten sehr schweren Schäumen oder durch Aufbringen einer äußeren Polyesterschicht o. ä, eine hart# Außenhaut erzeugt werden kann, deren Verankerung zu dem sandwichähnlichen Mittelteil durch Glasseide,- die während des Aufsprühens eingegeben wird, gewährleistet wird. Die Mittelschicht kann je nach Wunsch von wenigen mm bis zu mehreren cm starken Schichten aufgebracht werden, wobei hier beliebige Raumgewichte verwendet werden können. Als Deckschicht wird wieder eine Schicht mit härterem Material aufgebracht, so daß das hier entstandene Gebilde praktisch als Sandwich zu betrachten ist. Die Vorteile liegen im wesentlichen in drei Dingen: 1. daß hier keine Druckkräfte aufnehmende Form benötigt wird; 2. daß unabhängig von der durch die Form gegebenen Abmessungen die Schichten je nach Belieben stark gewählt werden können; 3. daß hier ein sehr schnell härtender Sprühschaum benutzt werden kann, so daß unmittelbar nach Beendigung des Sprühvorganges das Teil aus der Form herausgenommen werden kann und somit lange Formenverweilzeiten vermieden werden.This inventive method enables less complex negative forms, into which the foam is sprayed with the simultaneous addition of shredded glass fiber is applied, In the past it was also possible to make impressions by spraying a form with PU, but was because of the low surface hardness and Inadequate torsional rigidity, the production of larger structural parts not possible.-This method has the advantage that even the largest structural parts can be produced by spraying, with the help of initially applied very heavy foams or by applying an outer polyester layer or similar, a hard # outer skin can be produced whose anchoring to the sandwich-like Middle part by glass fiber, - which is entered during the spraying, guaranteed will. The middle layer can be from a few mm to several cm thick, depending on your requirements Layers are applied, any volume weights being used here can. Another layer of harder material is applied as a top layer, so that the structure created here can practically be regarded as a sandwich. the The advantages lie essentially in three things: 1. that none here Compressive force-absorbing form is required; 2. that regardless of the by the Shape given dimensions the layers can be chosen at will strongly; 3. that a very fast curing spray foam can be used here, so that immediately after completion of the spraying process, the part can be removed from the mold and thus long mold dwell times are avoided.

Patentanspruche 1. Yormteil-Herstellung dadurch gekennzeichnet, daß (1) einfache drucklos benutzbare Formen ohne statische Belastung nur durch das Eigengewicht des Schaumes benutzt werden können, in die der Schaum im Sprühverfahren eingegeben wird. Claims 1. Yorm part production, characterized in that (1) Simple forms that can be used without pressure and without static load only due to their own weight of the foam can be used, in which the foam is entered by spraying will.

Claims (1)

2. Verfahren zur Herstellung nach Anspruch 1 dadurch gekennzeichnet, daß während des Schäumprozesses verschiedene Schäume mit verschiedenen Materialeigenschaften und Raumgewichten benutzt werden können. (2) 3. Verfahren zur Herstellung nach Anspruch 1 und 2 dadurch gekennzeichnet, daß während des Sprühvorganges Giasfaserschnitzel o. ä. zugegeben werden können. (3) 4. Verfahren zur Herstellung nach Anspruch 1 bis 3 dadurch gekennzeichnet, daß mehrere Sprühpistolen zur Erstellung eines Formteiles unabhängig und gleichzeitig von einander eingesetzt werden können. (4) 5. Verfahren zur Herstellung nach Anspruch 1 bis 4 dadurch gekennzeichnet, daß zwei Sprülipistolen dergestalt eingesetzt werden, daß ihr Spritzstrahl im (5) spitzen Winkel gegeneinander gerichtet wird, wobei gleichzeitig Zugabe von Glasseide in diesen spitzen Winkel erfolgen kann. (6)2. The method for producing according to claim 1, characterized in that that during the foaming process different foams with different material properties and volume weights can be used. (2) 3. A method of manufacture according to claim 1 and 2 characterized in that glass fiber chips during the spraying process or the like can be added. (3) 4. The method for manufacturing according to claim 1 to 3 characterized in that several spray guns for creating a molded part can be used independently and simultaneously from each other. (4) 5. Procedure for production according to claims 1 to 4, characterized in that two spray guns be used in such a way that their spray jet at (5) acute angle to each other is directed, at the same time adding fiberglass in this acute angle can be done. (6)
DE2157921A 1971-11-23 1971-11-23 Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds Pending DE2157921A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2157921A DE2157921A1 (en) 1971-11-23 1971-11-23 Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2157921A DE2157921A1 (en) 1971-11-23 1971-11-23 Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds

Publications (1)

Publication Number Publication Date
DE2157921A1 true DE2157921A1 (en) 1973-05-30

Family

ID=5825821

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2157921A Pending DE2157921A1 (en) 1971-11-23 1971-11-23 Polyurethane foam moulded parts - reinforced with glass fibre produced by spraying into simple pressureless negative moulds

Country Status (1)

Country Link
DE (1) DE2157921A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023237A1 (en) * 1992-05-18 1993-11-25 Recticel Method for manufacturing self-supporting synthetic trim parts and thus manufactured trim parts
WO2005018916A1 (en) * 2003-08-20 2005-03-03 Johnson Controls Gmbh Upholstery part, in particular equipment for the interior of a motor vehicle, method for producing said part and seat

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023237A1 (en) * 1992-05-18 1993-11-25 Recticel Method for manufacturing self-supporting synthetic trim parts and thus manufactured trim parts
BE1005821A3 (en) * 1992-05-18 1994-02-08 Recticel PROCESS FOR THE PRODUCTION OF SELF-SUPPORTING APPETIZERS PLASTIC PARTS AND THUS MANUFACTURED trim part.
WO2005018916A1 (en) * 2003-08-20 2005-03-03 Johnson Controls Gmbh Upholstery part, in particular equipment for the interior of a motor vehicle, method for producing said part and seat

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