CH357864A - Process for the production of hollow objects from a glass fiber mat impregnated with synthetic resin - Google Patents

Process for the production of hollow objects from a glass fiber mat impregnated with synthetic resin

Info

Publication number
CH357864A
CH357864A CH357864DA CH357864A CH 357864 A CH357864 A CH 357864A CH 357864D A CH357864D A CH 357864DA CH 357864 A CH357864 A CH 357864A
Authority
CH
Switzerland
Prior art keywords
glass fiber
fiber mat
synthetic resin
dependent
mold
Prior art date
Application number
Other languages
German (de)
Inventor
Julius Evenblij Johan Carl
Original Assignee
Polypress Nv
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 Polypress Nv filed Critical Polypress Nv
Publication of CH357864A publication Critical patent/CH357864A/en

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
    • 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
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/006—Degassing moulding material or draining off gas during moulding
    • B29C37/0064—Degassing moulding material or draining off gas during moulding of reinforced material
    • 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
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/06—Unsaturated polyesters

Description

  

  
 



  Verfahren zur Herstellung von hohlen Gegenständen aus einer mit Kunstharz imprägnierten Glasfasermatte
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung von hohlen Gegenständen aus einer mit Kunstharz imprägnierten Glasfasermatte, z. B. einer Lichtkuppel für Gebäudebeleuchtung.



   Das erfindungsgemässe Verfahren ist dadurch gekennzeichnet, dass eine mit Kunstharz imprägnierte Glasfasermatte flach und luftdicht zwischen eine Unter- und eine Decklage aus dehnbarem und luftdichtem Material gelegt wird, worauf das Ganze luftdicht auf den Umfangsflansch einer Form geklemmt wird, dass darauf in der Form Vakuum hergestellt wird, derart, dass die Glasfasermatte mit der Unter- und Decklage gegen die innere Wand der Form gepresst wird, dass nach Ende der Behandlung das Vakuum aufgehoben, der Gegenstand herausgenommen wird und die Deck- und die Unterlage entfernt werden.



   Anhand der Zeichnung wird das erfindungsgemässe Verfahren beispielsweise erläutert.



   Es zeigen:
Fig. 1 eine Draufsicht eines Bearbeitungstisches und
Fig. 2 einen Schnitt durch die Form.



   Zur Herstellung einer kreisförmigen Lichtkuppel wird eine runde Unterlage 2 auf den Tisch 1 gelegt.



  Auf diese Unterlage 2 wird dann eine Matte 3 kleineren Durchmessers aus Glasfasern gelegt und Kunstharz, zweckmässig durchsichtiges Polyesterharz, auf diese Matte 3 aufgetragen, worauf eine Decklage 4 gleichen Durchmessers wie die Unterlage 2 über das Ganze gelegt wird. Mit Hilfe der Rolle 5, die radial und von der Mitte gegen den Rand hin bewegt wird, werden die Unter- und Decklagen 2, 4 sowie die Matte 3 glattgestrichen, wobei gleichzeitig der Harz überschuss herausgepresst wird. Dadurch wird die Bildung von Luftblasen vermieden. Die Ränder der Unter- und Decklage werden dabei durch das herausgedrückte Kunstharz aneinandergeklebt.



   Das Ganze wird nun auf den kreisrunden Flansch 6a einer Form 6 gelegt, die über einen Stutzen 7 mit einer Vakuumquelle verbindbar ist. Darüber wird ein Haltering 8 angeordnet und mittels schraubenartigen Klammern 9 fest an den Flansch 6a gepresst. Unter der Unterlage 2 wird dann Vakuum erzeugt, worauf die Unter- und Decklage mit der mit Harz imprägnierten Matte 3 dazwischen gegen die kuppelförmige Wand der Form 6 gepresst wird (strichpunktiert in Fig. 2). Unter Aufrechterhaltung des Vakuums wird die Form 6 mittels der Infrarotheizkörper 10 geheizt.



  Je nach den verwendeten Beschleunigern kann die Temperatur z. B. 80 bis   120"C    betragen. Die Unterund die Decklage bestehen aus einem luftdichten, dehnbaren Material, zweckmässig aus Polyvinylchlorid oder aus regenerierter Cellulose.



   Je nach den verwendeten Materialien kann auch eine Kaltbehandlung vorgenommen werden. Am Ende der Verformung wird das Vakuum aufgehoben, die Kuppel herausgenommen und die Unter- und Decklage entfernt. Natürlich kann man Formen verwenden, die einen anderen Umriss, z. B. einen ovalen oder viereckigen Umriss aufweisen.



   Die dargestellte Vorrichtung ist nur geringen Drücken ausgesetzt, so dass sie aus ziemlich dünnem Material, z. B. Metallblechen oder Holzplatten hergestellt werden kann, die Drücke in der Grössenordnung einer Atmosphäre aushalten müssen.



   Das herausgedrückte Harz klebt die Ränder der Deck- und der Unterlage derart zusammen, dass keine Luft zwischen ihnen angesogen werden kann.



   Gemäss dem beschriebenen Verfahren hergestellte Gegenstände, insbesondere Lichtkuppeln aus Polyesterharz erweisen sich als durchsichtiger als nach  bekannten Verfahren hergestellte ähnliche Gegenstände und weisen dazu eine glatte Oberfläche auf.   



  
 



  Process for the production of hollow objects from a glass fiber mat impregnated with synthetic resin
The present invention relates to a method for the production of hollow objects from a synthetic resin impregnated fiberglass mat, e.g. B. a dome light for building lighting.



   The method according to the invention is characterized in that a synthetic resin-impregnated glass fiber mat is placed flat and airtight between a base and a cover layer made of stretchable and airtight material, whereupon the whole thing is clamped airtight onto the circumferential flange of a mold so that a vacuum is created in the mold is, in such a way that the glass fiber mat with the underlay and cover layer is pressed against the inner wall of the mold that after the end of the treatment the vacuum is released, the object is taken out and the cover and underlay are removed.



   The method according to the invention is explained, for example, using the drawing.



   Show it:
Fig. 1 is a plan view of a processing table and
Fig. 2 is a section through the mold.



   To produce a circular light dome, a round base 2 is placed on the table 1.



  On this base 2 a mat 3 of smaller diameter made of glass fibers is then placed and synthetic resin, suitably transparent polyester resin, is applied to this mat 3, whereupon a cover layer 4 of the same diameter as the base 2 is placed over the whole. With the help of the roller 5, which is moved radially and from the center towards the edge, the bottom and top layers 2, 4 and the mat 3 are smoothed out, the excess resin being pressed out at the same time. This will prevent the formation of air bubbles. The edges of the bottom and top layers are glued to each other by the pressed out synthetic resin.



   The whole is now placed on the circular flange 6a of a mold 6, which can be connected to a vacuum source via a nozzle 7. A retaining ring 8 is arranged above this and pressed firmly against the flange 6a by means of screw-like clamps 9. A vacuum is then generated under the underlay 2, whereupon the underlay and cover layer with the resin-impregnated mat 3 in between are pressed against the dome-shaped wall of the mold 6 (dash-dotted lines in FIG. 2). While maintaining the vacuum, the mold 6 is heated by means of the infrared heating element 10.



  Depending on the accelerators used, the temperature can e.g. B. 80 to 120 "C. The bottom and top layers consist of an airtight, stretchable material, suitably of polyvinyl chloride or of regenerated cellulose.



   Depending on the materials used, cold treatment can also be carried out. At the end of the deformation, the vacuum is released, the dome is removed and the top and bottom layers are removed. Of course, you can use shapes that have a different outline, e.g. B. have an oval or square outline.



   The device shown is only exposed to low pressures, so that it is made of fairly thin material, e.g. B. sheet metal or wooden panels can be produced that must withstand pressures in the order of magnitude of an atmosphere.



   The squeezed out resin sticks the edges of the top and backing together in such a way that no air can be drawn in between them.



   Objects produced according to the described method, in particular light domes made of polyester resin, prove to be more transparent than similar objects produced according to known methods and for this purpose have a smooth surface.

Claims (1)

PATENTANSPRÜCHE I. Verfahren zur Herstellung von hohlen Gegenständen aus einer mit Kunstharz imprägnierten Glasfasermatte, dadurch gekennzeichnet, dass eine mit Kunstharz imprägnierte Glasfasermatte flach und luftdicht zwischen eine Unter- und eine Decklage aus dehnbarem und luftdichtem Material gelegt wird, worauf das Ganze luftdicht auf den Umfangsflansch einer Form geklemmt wird, dass darauf in der Form Vakuum hergestellt wird, derart, dass die Glasfasermatte mit der Unter- und der Decklage gegen die innere Wand der Forrn gepresst wird, dass nach Ende der Behandlung das Vakuum aufgehoben, der Gegenstand herausgenommen wird und die Deck- und die Unterlage entfernt werden. PATENT CLAIMS I. A method for the production of hollow objects from a synthetic resin-impregnated glass fiber mat, characterized in that a synthetic resin-impregnated glass fiber mat is placed flat and airtight between a base and a cover layer made of stretchable and airtight material, whereupon the whole thing is airtight on the peripheral flange Mold is clamped that on it in the mold vacuum is created, in such a way that the glass fiber mat with the bottom and top layer is pressed against the inner wall of the mold that after the end of the treatment, the vacuum is released, the object is removed and the deck - and the pad removed. II. Nach dem Verfahren gemäss Patentanspruch I hergestellter Gegenstand. II. Item manufactured according to the method according to claim I. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass die Unter- und die Decklage grö ssere Abmessungen als die Glasfasermatte haben und dieselbe allseitig überlappen. SUBCLAIMS 1. The method according to claim I, characterized in that the bottom and top layers have larger dimensions than the glass fiber mat and overlap the same on all sides. 2. Verfahren nach Unteranspruch 1, dadurch gekennzeichnet, dass, nachdem die Glasfasermatte zwischen Deck- und Unterlage angeordnet wurde, der Harzüberschuss und die Luftblasen mittels einer von der Mitte nach aussen bewegten Rolle entfernt werden, wobei die Ränder der Unter- und Decklage durch das herausgedrückte Kunstharz aneinandergeklebt werden. 2. The method according to dependent claim 1, characterized in that, after the glass fiber mat has been arranged between the top and bottom layer, the excess resin and the air bubbles are removed by means of a roller moved outward from the center, the edges of the bottom and top layer through the Resin pressed out are glued together. 3. Verfahren nach Unteranspruch 2, dadurch gekennzeichnet, dass die Behandlung unter Anwendung von Wärme erfolgt. 3. The method according to dependent claim 2, characterized in that the treatment is carried out using heat. 4. Verfahren nach Unteranspruch 3, dadurch gekennzeichnet, dass die Glasfasermatte mit durchsichtigem Polyesterharz imprägniert wird, und dass die Behandlung bei einer Temperatur von mindestens 80 und höchstens 1200 C vorgenommen wird. 4. The method according to dependent claim 3, characterized in that the glass fiber mat is impregnated with transparent polyester resin, and that the treatment is carried out at a temperature of at least 80 and at most 1200 C. 5. Verfahren nach Unteranspruch 4, dadurch gekennzeichnet, dass die Unter- und die Decklage aus Polyvinylchlorid bestehen. 5. The method according to dependent claim 4, characterized in that the bottom and top layers are made of polyvinyl chloride. 6. Gegenstand nach Patentanspruch II, dadurch gekennzeichnet, dass er eine Lichtkuppel für Gebäudebeleuchtung ist. 6. The object according to claim II, characterized in that it is a dome light for building lighting.
CH357864D 1957-09-26 1958-02-13 Process for the production of hollow objects from a glass fiber mat impregnated with synthetic resin CH357864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL357864X 1957-09-26

Publications (1)

Publication Number Publication Date
CH357864A true CH357864A (en) 1961-10-31

Family

ID=19785292

Family Applications (1)

Application Number Title Priority Date Filing Date
CH357864D CH357864A (en) 1957-09-26 1958-02-13 Process for the production of hollow objects from a glass fiber mat impregnated with synthetic resin

Country Status (3)

Country Link
BE (1) BE585660A (en)
CH (1) CH357864A (en)
NL (1) NL97044C (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831679A1 (en) * 1977-10-26 1979-05-23 Herbert Schreiber LIGHT-CURABLE PREPREG
EP0036391A2 (en) * 1980-03-17 1981-09-23 Herbert Schreiber Process for preparing fibre-reinforced plastic articles, prepreg to be used in the process and the article so prepared
DE3027655A1 (en) * 1980-03-17 1981-09-24 Herbert 7140 Ludwigsburg Schreiber METHOD FOR PRODUCING FIBER REINFORCED PLASTIC OBJECTS
DE3206905A1 (en) * 1982-02-26 1983-10-27 Weigel, Angela Process for producing reinforced components by means of a vacuum and substrate surfaces; autolaminate method
DE3319204A1 (en) * 1983-05-27 1984-11-29 Weigel, Angela Process for producing laminated moulds and components using a vacuum
EP0195561A2 (en) * 1985-03-21 1986-09-24 Imperial Chemical Industries Plc Method of producing shaped articles from reinforced composites
EP0358510A2 (en) * 1988-09-09 1990-03-14 British Aerospace Public Limited Company Apparatus and method for making composite materials

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831679A1 (en) * 1977-10-26 1979-05-23 Herbert Schreiber LIGHT-CURABLE PREPREG
EP0036391A2 (en) * 1980-03-17 1981-09-23 Herbert Schreiber Process for preparing fibre-reinforced plastic articles, prepreg to be used in the process and the article so prepared
DE3027655A1 (en) * 1980-03-17 1981-09-24 Herbert 7140 Ludwigsburg Schreiber METHOD FOR PRODUCING FIBER REINFORCED PLASTIC OBJECTS
EP0036391A3 (en) * 1980-03-17 1981-10-14 Herbert Schreiber Process for preparing fibre-reinforced plastic articles, prepreg to be used in the process and the article so prepared
DE3206905A1 (en) * 1982-02-26 1983-10-27 Weigel, Angela Process for producing reinforced components by means of a vacuum and substrate surfaces; autolaminate method
DE3319204A1 (en) * 1983-05-27 1984-11-29 Weigel, Angela Process for producing laminated moulds and components using a vacuum
EP0195561A2 (en) * 1985-03-21 1986-09-24 Imperial Chemical Industries Plc Method of producing shaped articles from reinforced composites
EP0195561A3 (en) * 1985-03-21 1989-01-18 Imperial Chemical Industries Plc Method of producing shaped articles from reinforced composites
EP0358510A2 (en) * 1988-09-09 1990-03-14 British Aerospace Public Limited Company Apparatus and method for making composite materials
EP0358510A3 (en) * 1988-09-09 1991-07-31 British Aerospace Public Limited Company Apparatus and method for making composite materials

Also Published As

Publication number Publication date
NL97044C (en)
BE585660A (en)

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