[go: up one dir, main page]

DE19618592A1 - Thermoplastic sandwich moulding prodn. process - Google Patents

Thermoplastic sandwich moulding prodn. process

Info

Publication number
DE19618592A1
DE19618592A1 DE19618592A DE19618592A DE19618592A1 DE 19618592 A1 DE19618592 A1 DE 19618592A1 DE 19618592 A DE19618592 A DE 19618592A DE 19618592 A DE19618592 A DE 19618592A DE 19618592 A1 DE19618592 A1 DE 19618592A1
Authority
DE
Germany
Prior art keywords
sandwich
cover layer
fiber
thermoplastic sandwich
thermoplastic
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Withdrawn
Application number
DE19618592A
Other languages
German (de)
Inventor
Ulf Breuer
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.)
Institut fuer Verbundwerkstoffe GmbH
Original Assignee
Institut fuer Verbundwerkstoffe 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 Institut fuer Verbundwerkstoffe GmbH filed Critical Institut fuer Verbundwerkstoffe GmbH
Priority to DE19618592A priority Critical patent/DE19618592A1/en
Publication of DE19618592A1 publication Critical patent/DE19618592A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
    • B29L2031/608—Honeycomb structures

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 producing thermoplastic sandwich type mouldings, with a fibre reinforced cover layer, comprises warming the sandwich and placing it in a stamping press. The press has upper and lower tools and is used to form the sandwich while maintaining upper and lower cover layer spacings. Fold formation is pref. minimised or prevented completely.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von zwei- oder dreidimensionalen Sandwich-Formteilen, welche aus thermoplastischen, faserverstärkten Deckschichten und einem thermoplastischem Kernmaterial bestehen.The invention relates to a method for producing two- or three-dimensional Sandwich molded parts, which consist of thermoplastic, fiber-reinforced cover layers and consist of a thermoplastic core material.

Faserverstärkte, thermoplastische Sandwichformteile können wirtschaftlich hergestellt werden, indem faserverstärkte, thermoplastische Deckschichten zusammen mit einem thermoplastischem Kernmaterial (wie z. B. Schaum oder Waben) zunächst über die Erweichungstemperatur erwärmt- und anschließend in einer Presse mit festen Ober- und Unterwerkzeugen umgeformt werden, bis sie ausreichend abgekühlt sind und entnommen werden können. Dabei kann es jedoch zu einer unerwünschten Komprimierung des erweichten bzw. nicht ausreichend druckfesten Kernmaterials und somit zu erheblichen Maßabweichungen kommen (Quelle: Mayer, C. et al.: High Speed Manufacturing of Knitted Thermoplastic Composite Sandwich Sheets; Proceedings 17th International SAMPE Conference & Exhibition, May 28-30, 1996, Basel, CH).Fiber-reinforced, thermoplastic sandwich molded parts can be produced economically by first heating fiber-reinforced, thermoplastic outer layers together with a thermoplastic core material (such as foam or honeycomb) to above the softening temperature - and then reshaping them in a press with fixed upper and lower tools until they have cooled sufficiently and can be removed. However, this can result in undesired compression of the softened or insufficiently pressure-resistant core material and thus considerable dimensional deviations (Source: Mayer, C. et al .: High Speed Manufacturing of Knitted Thermoplastic Composite Sandwich Sheets; Proceedings 17 th International SAMPE Conference & Exhibition, May 28-30, 1996, Basel, CH).

Zur Erzielung hoher Biegesteifigkeit bei Sandwich-Bauweisen sowie zur Reproduzierbarkeit des beschriebenen Umformverfahrens muß jedoch ein möglichst großer und gleichbleibender Abstand der faserverstärkten Deckschichten erhalten bleiben. Ziel ist es daher, unerwünschte Komprimierungen des Abstandhalters Kernmaterial zu vermeiden.To achieve high bending stiffness in sandwich construction and However, the reproducibility of the forming process described must be as possible large and constant distance between the fiber-reinforced cover layers is maintained. The aim is therefore to prevent undesirable compression of the spacer core material avoid.

Zur Lösung dieser Aufgabe sieht das neue Verfahren die Evakuierung der in der Matrize eingeschlossenen Luft durch eine Vakuumpumpe vor. Ein Ausführungsbeispiel ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.To solve this task, the new process sees the evacuation in the die trapped air by a vacuum pump. An embodiment is in the Drawing shown and is described in more detail below.

Das erwärmte Sandwich (a) wird zunächst zwischen Ober (1)- und Unterwerkzeug (2) positioniert. Die Umformung erfolgt dann durch Schließen der Werkzeughälften, bis die Abstandhalter (3) aufeinandertreffen. Beim Auftreffen des Stempels (1) auf die obere Deckschicht (b) wird die Vakuumpumpe (4) eingeschaltet, welche die Luft aus der Kavität des Unterwerkzeuges (2), die nach oben durch die untere Deckschicht (c) des Sandwichs abgeschlossen ist, absaugt. Dadurch entsteht in der Kavität ein Unterdruck gegenüber dem porösen Kernmaterial (d) des Sandwichs. Dieser Unterdruck führt zu einer vollständigen Ausformung der unteren Deckschicht (c) und verhindert somit eine Komprimierung des Kernmaterials (d). Nach der Abkühlung und Verfestigung des Materials wird die Vakuumpumpe wieder abgeschaltet, und das Formteil kann entnommen werden.The heated sandwich (a) is first positioned between the upper ( 1 ) and lower tool ( 2 ). The forming is then carried out by closing the mold halves until the spacers ( 3 ) meet. When the stamp ( 1 ) hits the upper cover layer (b), the vacuum pump ( 4 ) is switched on, which draws the air out of the cavity of the lower tool ( 2 ), which is closed at the top by the lower cover layer (c) of the sandwich . This creates a negative pressure in the cavity compared to the porous core material (d) of the sandwich. This negative pressure leads to a complete formation of the lower cover layer (c) and thus prevents compression of the core material (d). After the material has cooled and solidified, the vacuum pump is switched off again and the molded part can be removed.

Werden kontinuierlich faserverstärkte Deckschichten verwendet, so trägt die Applizierung eines Vakuums außerdem zur Vermeidung unerwünschter Faltenbildungen in den Deckschichten bei.If fiber-reinforced cover layers are used continuously, the application will bear a vacuum also to avoid unwanted wrinkles in the Top layers at.

Claims (3)

1. Verfahren zur Herstellung von thermoplastischen Sandwichformteilen mit faserverstärkten Deckschichten, dadurch gekennzeichnet, daß das Sandwich im erwärmten, aufgeweichten Zustand auf einer Stempelpresse mit festem Ober- und Unterwerkzeug unter Beibehaltung des Abstandes von oberer Deckschicht zu unterer Deckschicht umgeformt wird.1. A method for producing thermoplastic sandwich moldings with fiber-reinforced cover layers, characterized in that the sandwich is formed in the heated, softened state on a stamp press with a fixed upper and lower tool while maintaining the distance from the upper cover layer to the lower cover layer. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Unterstützung der vollständigen Ausformung im Matrizen-Werkzeug ein Vakuum angelegt wird.2. The method according to claim 1, characterized in that to support the a complete vacuum is created in the die tool. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei der Verwendung kontinuierlich faserverstärkter Deckschichten Faltenbildungen reduziert oder ganz vermieden werden.3. The method according to claim 1 or 2, characterized in that in use Continuously fiber-reinforced cover layers reduce or completely reduce wrinkles be avoided.
DE19618592A 1996-05-09 1996-05-09 Thermoplastic sandwich moulding prodn. process Withdrawn DE19618592A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19618592A DE19618592A1 (en) 1996-05-09 1996-05-09 Thermoplastic sandwich moulding prodn. process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19618592A DE19618592A1 (en) 1996-05-09 1996-05-09 Thermoplastic sandwich moulding prodn. process

Publications (1)

Publication Number Publication Date
DE19618592A1 true DE19618592A1 (en) 1997-01-23

Family

ID=7793771

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19618592A Withdrawn DE19618592A1 (en) 1996-05-09 1996-05-09 Thermoplastic sandwich moulding prodn. process

Country Status (1)

Country Link
DE (1) DE19618592A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101380A1 (en) * 2010-07-27 2012-01-28 Dow Global Technologies Inc COMPOSITE POLYURETHANE PANEL WITH LOW ENVIRONMENTAL IMPACT
DE102015120631A1 (en) * 2015-11-27 2017-06-01 Variotech GmbH Apparatus and method for manufacturing a transport container, and transport containers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2650581A1 (en) * 1975-11-07 1977-05-18 Sumitomo Chemical Co HOT FORMING PROCESS FOR THE MANUFACTURING OF MOLDED PARTS FROM PLASTIC CORRUGATED BOARD MATERIAL
DE4323590A1 (en) * 1992-07-17 1994-03-17 Thomas Cantz Three=dimensional lightweight sandwich structure - comprises thermoplastic foam core and fabric reinforced thermoplastic facings loosely stacked for moulding in hot tool.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2650581A1 (en) * 1975-11-07 1977-05-18 Sumitomo Chemical Co HOT FORMING PROCESS FOR THE MANUFACTURING OF MOLDED PARTS FROM PLASTIC CORRUGATED BOARD MATERIAL
DE4323590A1 (en) * 1992-07-17 1994-03-17 Thomas Cantz Three=dimensional lightweight sandwich structure - comprises thermoplastic foam core and fabric reinforced thermoplastic facings loosely stacked for moulding in hot tool.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20101380A1 (en) * 2010-07-27 2012-01-28 Dow Global Technologies Inc COMPOSITE POLYURETHANE PANEL WITH LOW ENVIRONMENTAL IMPACT
WO2012015583A1 (en) * 2010-07-27 2012-02-02 Dow Global Technologies Llc Environmentally friendly polyurethane composite panel and method to manufacture it
DE102015120631A1 (en) * 2015-11-27 2017-06-01 Variotech GmbH Apparatus and method for manufacturing a transport container, and transport containers

Similar Documents

Publication Publication Date Title
DE69231121T2 (en) Process for the production of molded products from reinforced thermoplastic films
DE69217870T2 (en) Method and device for casting plastic composite material
DE60224058T2 (en) HOT-MELT IMPREGNATION PROCESS OF A 3-D FIBER-EXTRACTED PRE-FORMING
DE69320772T2 (en) Process for producing composite connections for truss-like structure or truss parts, and trusses thus produced
DE69200832T2 (en) Method of making a composite fan blade and molding device.
DE68918186T2 (en) Form and method for compression molding fiber-reinforced plastic parts.
DE4017852C2 (en) Flat object with honeycomb structure and process for its production
EP1103370A1 (en) Method for manufacturing a profile from hybrid material
EP0713759A2 (en) Method for producing a thermoformed lined object
DE102004025704A1 (en) Fiber reinforced plastic component manufacture involves compressing resin impregnated fiber composite between mold, upper films and pressurized membrane while heat transfer fluids flows between film and membrane
CH662780A5 (en) METHOD FOR PRODUCING MOLDED BODIES FROM FOAM PLASTIC.
DE3834604C2 (en) Method and device for producing objects made of foam, which are coated with a thermoformable plastic sheet
DE69810637T2 (en) METHOD FOR MOLDING A LOAD SUPPORT PART FROM REINFORCED THERMOPLAST
DE19959654A1 (en) Process for the production of interior components of motor vehicles
DE3604175A1 (en) Process and device for the compression moulding of foam together with rigid plastic
DE3505828A1 (en) METHOD FOR THE PRODUCTION OF MOLDED PLASTIC ELEMENTS, AND THERMOFORMING DEVICE SUITABLE FOR THIS
DE19618592A1 (en) Thermoplastic sandwich moulding prodn. process
DE3536272C2 (en)
ATE87260T1 (en) PROCESS FOR MAKING COMPOSITE PARTS CONSISTING OF A FLEECE AND A REINFORCEMENT.
DE4323590A1 (en) Three=dimensional lightweight sandwich structure - comprises thermoplastic foam core and fabric reinforced thermoplastic facings loosely stacked for moulding in hot tool.
DE3206905A1 (en) Process for producing reinforced components by means of a vacuum and substrate surfaces; autolaminate method
EP3216581B1 (en) Method of producing a flat article in sandwich lightweight construction design
DE1922261A1 (en) Method and device for the production of thermoplastic products and cellular products produced by this method and with the aid of this device
AT390260B (en) METHOD FOR PRODUCING A SYNTHETIC SEMI-FINISHED PRODUCT AND USE OF THIS SEMI-FINISHED PRODUCT
DE3444321A1 (en) Fibre-reinforced plastics mouldings, preferably in large-area embodiment, having a smooth coloured or paintable surface, which are provided with a protective film until their further processing, and process for the production thereof

Legal Events

Date Code Title Description
OAV Publication of unexamined application with consent of applicant
OP8 Request for examination as to paragraph 44 patent law
8122 Nonbinding interest in granting licences declared
8130 Withdrawal