FR2640189A1 - METHOD OF MANUFACTURING A THERMOPLASTIC REFLECTOR AND REFLECTOR THUS OBTAINED - Google Patents
METHOD OF MANUFACTURING A THERMOPLASTIC REFLECTOR AND REFLECTOR THUS OBTAINED Download PDFInfo
- Publication number
- FR2640189A1 FR2640189A1 FR8816307A FR8816307A FR2640189A1 FR 2640189 A1 FR2640189 A1 FR 2640189A1 FR 8816307 A FR8816307 A FR 8816307A FR 8816307 A FR8816307 A FR 8816307A FR 2640189 A1 FR2640189 A1 FR 2640189A1
- Authority
- FR
- France
- Prior art keywords
- fibers
- reflector
- thermoplastic
- isotropic
- thermoplastic material
- 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
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1643—Making multilayered or multicoloured articles having a "sandwich" structure from at least three different materials or with at least four layers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
-
- 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
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0083—Reflectors
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
L'invention concerne un procédé de fabrication d'un réflecteur, en particulier pour un projecteur de véhicule automobile, consistant à injecter successivement dans un moule 2, 3 une matière thermoplastique non chargée 5 occupant une partie de la cavité du moule, puis une matière thermoplastique renforcée d'une charge et isotrope 7 poussant la première matière injectée 5 qui forme une peau alors que la seconde matière 7 forme une âme mécanique pour le réflecteur. Le procédé selon l'invention est caractérisé par le fait qu'avant l'injection de la matière chargée isotrope 7 on injecte une matière thermoplastique 6 très chargée en fibres formant au moins partiellement une couche intermédiaire de haute rigidité. Application à la fabrication des projecteurs de véhicules automobiles.The invention relates to a method of manufacturing a reflector, in particular for a motor vehicle headlight, consisting in successively injecting into a mold 2, 3 an unfilled thermoplastic material 5 occupying a part of the mold cavity, then a material thermoplastic reinforced with a filler and isotropic 7 pushing the first injected material 5 which forms a skin while the second material 7 forms a mechanical core for the reflector. The method according to the invention is characterized in that, before the injection of the isotropic loaded material 7, a thermoplastic material 6 very loaded with fibers is injected, at least partially forming an intermediate layer of high rigidity. Application to the manufacture of motor vehicle headlamps.
Description
PROCEDE DE FABRICATION D'UN REFLECTEURMETHOD FOR MANUFACTURING A REFLECTOR
THERMOPLASTIQUE ET REFLECTEUR AINSI OBTENU. THERMOPLASTIC AND REFLECTOR SO OBTAINED.
L'invention concerne un procédé de fabrication d'un réflecteur, en particulier pour un projecteur de véhicule automobile, consistant à injecter successivement dans un moule une matière thermoplastique non chargée occupant une partie de la cavité du moule, puis une matière thermoplastique renforcée d'une charge et isotrope poussant la première matière injectée qui forme une peau alors que la seconde matière forme une âme The invention relates to a method for manufacturing a reflector, in particular for a motor vehicle headlamp, consisting in successively injecting into a mold an unfilled thermoplastic material occupying part of the cavity of the mold, then a thermoplastic material reinforced with a charge and isotropic pushing the first injected material that forms a skin while the second material forms a soul
mécanique pour le réflecteur.mechanical for the reflector.
Un tel procédé, connu par FR-A-2432137 permet d'obtenir un réflecteur dont la peau, exempte de charge, permet une métallisation directe du réflecteur alors que l'âme, qui est liée intimement à la peau, doit assurer la résistance mécanique et thermique du réflecteur, en évitant en particulier les déformations dues à la chaleur dégagée en fonctionnement dans tout environnement Such a method, known from FR-A-2432137 makes it possible to obtain a reflector whose skin, free of charge, allows a direct metallization of the reflector while the core, which is intimately linked to the skin, must ensure the mechanical strength. and thermal reflector, avoiding in particular the deformations due to the heat released in operation in any environment
climatique possible.possible climate.
Un tel réflecteur, qui est en général moulé en deux matériaux compatibles, ne présente cependant pas dans toutes les configurations la rigidité nécessaire à la fixation et à l'assemblage de l'ensemble, de sorte que son utilisation est limitée par la nature et le taux Such a reflector, which is generally molded in two compatible materials, does not however have in all configurations the rigidity necessary for fixing and assembling the assembly, so that its use is limited by the nature and rate
possibles de charge des deux matières utilisables. possible charging of the two usable materials.
Cette insuffisance est due essentiellement au fait que la matière chargée isotrope utilisable n'a qu'un effet limité de rigidification et qu'une augmentation de la charge ne permet-pas une augmentation significative de This insufficiency is mainly due to the fact that the isotropic charged material that can be used has only a limited effect of stiffening and that an increase in the charge does not allow a significant increase in
cette rigidité.this rigidity.
La présente invention vise à supprimer cet inconvénient en permettant d'obtenir un réflecteur ayant les qualités mécaniques suffisantes à son assemblage et à The present invention aims at eliminating this drawback by making it possible to obtain a reflector having the mechanical qualities sufficient for its assembly and
sa fixation.its fixation.
A cet effet, le procédé selon l'invention est caractérisé par le fait qu'avant l'injection de la matière chargée isotrope, on injecte une matière thermoplastique très chargée en fibres formant au moins partiellement une couche intermédiaire de haute rigidité. On renforce ainsi le reflecteur par une couche de haute rigidité formée par la matière très chargée en fibres, le caractère anisotropique des fibres de renforcement assurant le renforcement souhaité au moins dans les zones d'assemblage et de fixation désirées, sans que la déformabilité des fibres sous l'effet de la chaleur ne nuise à la qualité optique du réflecteur du For this purpose, the process according to the invention is characterized in that prior to the injection of the isotropically charged material, a thermoplastic material with a high fiber content is injected, forming at least partially an intermediate layer of high rigidity. The reflector is thus reinforced by a layer of high rigidity formed by the highly fiber-filled material, the anisotropic nature of the reinforcing fibers ensuring the desired reinforcement at least in the desired areas of assembly and attachment, without the deformability of the fibers. under the effect of heat does not affect the optical quality of the reflector of the
fait de leur disposition sous peau en couche mince. made of them under skin in thin layer.
Les fibres de renforcement peuvent être des fibres minérales telles que verre, carbone, wollastonites, ou organiques telles aramides. Il peut également s'agir de fibres métalliques, par exemple choisies parmi le groupe des fibres de titane, d'acier inoxydable, d'aluminium, d'alliage nickel-cobalt, ainsi The reinforcing fibers may be mineral fibers such as glass, carbon, wollastonites, or organic such as aramids. It may also be metal fibers, for example selected from the group of titanium fibers, stainless steel, aluminum, nickel-cobalt alloy, and
que des mélanges de celles-ci.as mixtures of these.
Les injections successives peuvent être effectuées par une buse unique. En variante, elles sont Successive injections can be performed by a single nozzle. Alternatively, they are
effectuées par des buses distinctes. made by separate nozzles.
Le procédé selon l'invention permet, en réglant convenablement les quantités relatives de matières injectées, successivement, d'obtenir un renforcement particulier en certaines zones, en particulier des points d'assemblage et de fixation de l'enveloppe du réflecteur, en y poussant un volume important de matériau à haute rigidité qui, dans ces zones, peut ne pas être pénétré The method according to the invention makes it possible, by regulating suitably the relative quantities of injected materials, successively, to obtain a particular reinforcement in certain zones, in particular points of assembly and attachment of the envelope of the reflector, by pushing a large volume of high rigidity material which in these areas may not be penetrated
par la 3ème matière dite de coeur. by the 3rd matter called heart.
L'invention concerne également un réflecteur The invention also relates to a reflector
obtenu par le procédé précédent. obtained by the above method.
L'invention sera bien comprise à la lecture de la The invention will be well understood on reading the
description suivante faite en se référant au dessin following description made with reference to the drawing
annexé dans lequel: - la figure 1 est une vue schématique en coupe d'une partie d'un dispositif d'injection pour la mise en oeuvre du procédé selon une forme de mise en oeuvre de l'invention; - la figure 2 est une vue en coupe d'une portion du moule d'injection après achèvement des injections successives, pour une forme de mise en oeuvre; et - la figure 3 est analogue à la figure 2, pour appended in which: - Figure 1 is a schematic sectional view of a portion of an injection device for carrying out the method according to one embodiment of the invention; FIG. 2 is a sectional view of a portion of the injection mold after completion of the successive injections, for one form of implementation; and FIG. 3 is similar to FIG.
une variante.variant.
Dans la forme de mise en oeuvre représentée à la figure 1 trois matières thermoplastiques sont injectées successivement. A titre d'exemples non limitatif les matières thermoplastiques ont l'une des compositions pondérales In the embodiment shown in Figure 1 three thermoplastics are injected successively. By way of nonlimiting examples, the thermoplastics have one of the weight compositions
suivantes: -following: -
Composition n 1 Matière injectée en premier lieu: Polyamide 6.6: 100 % Matière injectée en second lieu: Polyamide 6.6.: 50 % Fibres de verre: 20 % Wollastonite: 20 % Fibres d'aluminium: 10 % Matière injectée en troisième lieu: Polyamide 6.6.: 50 % Mica: 40 % Graphite: 10 % Composition n 2 Matière injectée en premier lieu: Polysulfure de phénylène (PPS): 80 % Dioxyde de titane (TiO2): 20 % Matière injectée en second lieu: Composition n 1 Material injected first: Polyamide 6.6: 100% Secondly injected material: Polyamide 6.6 .: 50% Glass fibers: 20% Wollastonite: 20% Aluminum fibers: 10% Thirdly injected material: Polyamide 6.6 .: 50% Mica: 40% Graphite: 10% Composition n 2 Material injected firstly: Phenylene Polysulfide (PPS): 80% Titanium Dioxide (TiO2): 20% Material injected second:
PPS: 40%PPS: 40%
Fibres de verre: 60 % Matière injectée en troisième lieu: Fibers of glass: 60% Material injected in third place:
PPS: 50 %PPS: 50%
Talc:40% Graphite: 10 % L'injection est réalisée par une buse unique 1, dans une cavité de moule 2 fermée par un piston 3. De manière connue, un éjecteur de pièce 4 est logé en regard Talc: 40% Graphite: 10% The injection is carried out by a single nozzle 1, in a mold cavity 2 closed by a piston 3. In known manner, an ejector of part 4 is housed opposite
de la buse 1.of the nozzle 1.
Comme on l'a indiqué précédemment, on peut également utiliser trois buses d'injection distinctes pour chaque matière, chaque buse étant régulée individuellement en température pour alimenter chacune un canal d'alimentation du moule débouchant, coaxialement à l'entrée, dans une partie reliée au reste de la pièce par As indicated previously, it is also possible to use three separate injection nozzles for each material, each nozzle being individually regulated in temperature to supply each one a supply channel of the mold opening, coaxially to the inlet, in a part connected to the rest of the room by
une amorce de rupture.a breakthrough.
Conformément au procédé selon l'invention, on injecte d'abord une matière thermoplastique très faiblement chargée ou non 5 destinée à former une peau pouvant être directement métallisée. On injecte ensuite une matière thermoplastique 6 à forte charge de fibres minérales, métalliques ou autres. Enfin, on injecte une troisième matière thermoplastique 7 isotrope et charge In accordance with the process according to the invention, a thermoplastic material with a low or a low load is first injected for forming a skin which can be directly metallized. A thermoplastic material 6 is then injected with a high load of mineral, metallic or other fibers. Finally, a third thermoplastic material 7 is injected and charged
minérale ou organique.mineral or organic.
La matière 7 repousse dans la cavité 2 la matière 6 qui elle-même pousse la matière 5 et lui fait The material 7 pushes back into the cavity 2 the material 6 which itself pushes the material 5 and makes it
recouvrir la surface du moule 2-3 pour former une peau. cover the surface of the mold 2-3 to form a skin.
La matière 6 forme elle-même une couche mince entourée par la peau de matière 5 et assure la rigidité mécanique de l'ensemble. Enfin, la matière 7 forme le coeur du réflecteur en assurant sa forme géométrique désirée et The material 6 itself forms a thin layer surrounded by the material skin 5 and provides the mechanical rigidity of the assembly. Finally, the material 7 forms the core of the reflector ensuring its desired geometric shape and
son indéformabilité du fait de son isotropie. its indeformability due to its isotropy.
Dans l'exemple de la figure 2, la quantité de matière 7 est telle que, sur le bord du projecteur, il subsiste un volume important de matière rigide 6, qui renforcé ainsi cette zone d'assemblage et de fixation extrême. Dans l'exemple de la figure 3, la répartition des In the example of Figure 2, the amount of material 7 is such that, on the edge of the projector, there remains a large volume of rigid material 6, which thus reinforces the assembly area and extreme attachment. In the example of Figure 3, the distribution of
matières 5,6 et 7 est sensiblement uniforme. materials 5, 6 and 7 is substantially uniform.
Pour ces deux exemples, par le choix et la répartition décrits des matières, on obtient directement de moulage des pièces ayant un faible retrait uniforme, aucun post-retrait, et présentant des dilatations thermiques faibles et isotropes notamment au moins dans toute leur zone utile de réflexion optique déterminée, ainsi que sensiblement des zones d'assemblage et de For these two examples, by the choice and the described distribution of the materials, one obtains directly from molding parts having a low uniform shrinkage, no post-shrinkage, and having weak and isotropic thermal expansions, in particular at least throughout their useful zone. defined optical reflection, as well as substantially assembly and
fixation de très bonne rigidité.fixation of very good rigidity.
Bien entendu, après l'injection de la matière de coeur 7, on peut procéder à une nouvelle injection de matière 5 destinée à compléter le nourrissement de l'empreinte du moule et à préparer le cycle d'injections suivant. Of course, after the injection of the core material 7, it is possible to proceed to a new injection of material 5 intended to complete the feeding of the mold cavity and to prepare the next cycle of injections.
Claims (8)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8816307A FR2640189B1 (en) | 1988-12-12 | 1988-12-12 | METHOD FOR MANUFACTURING A THERMOPLASTIC REFLECTOR AND REFLECTOR THUS OBTAINED |
IT04863489A IT1237237B (en) | 1988-12-12 | 1989-12-07 | MANUFACTURING PROCEDURE OF A THERMOPLASTIC REFLECTOR AND REFLECTOR SO OBTAINED. |
DE3940436A DE3940436C2 (en) | 1988-12-12 | 1989-12-07 | Method for producing a thermoplastic reflector and reflector thus produced |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8816307A FR2640189B1 (en) | 1988-12-12 | 1988-12-12 | METHOD FOR MANUFACTURING A THERMOPLASTIC REFLECTOR AND REFLECTOR THUS OBTAINED |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2640189A1 true FR2640189A1 (en) | 1990-06-15 |
FR2640189B1 FR2640189B1 (en) | 1991-01-18 |
Family
ID=9372828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8816307A Expired - Lifetime FR2640189B1 (en) | 1988-12-12 | 1988-12-12 | METHOD FOR MANUFACTURING A THERMOPLASTIC REFLECTOR AND REFLECTOR THUS OBTAINED |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3940436C2 (en) |
FR (1) | FR2640189B1 (en) |
IT (1) | IT1237237B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0328965A2 (en) * | 1988-02-13 | 1989-08-23 | Bayer Ag | Two-component injection-moulding composition containing polyarylene sulphide |
EP0658422A1 (en) * | 1993-12-14 | 1995-06-21 | Ems-Inventa Ag | Moulded article with a resistant surface |
WO1995020129A1 (en) * | 1994-01-22 | 1995-07-27 | Hella Kg Hueck & Co. | Strongly heat-resistant mouldings |
WO1998009791A1 (en) * | 1996-09-04 | 1998-03-12 | The Dow Chemical Company | Composites of crystalline polymers |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000085457A (en) * | 1998-09-18 | 2000-03-28 | Koito Mfg Co Ltd | Lighting fixture for vehicle |
DE19907508A1 (en) * | 1999-02-22 | 2000-08-24 | Hench Gmbh H | Tubular injection molded plastic component with integral connectors for cleaning equipment is molded in a single stage with a thin outer plastic cover and reinforced inner layer |
EP2785794B1 (en) | 2011-11-30 | 2017-08-23 | Covestro Deutschland AG | Molded bodies having high surface quality |
DE102021125674A1 (en) | 2021-10-04 | 2023-04-06 | HELLA GmbH & Co. KGaA | Simultaneous multi-component injection molding for automotive headlights |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4052497A (en) * | 1973-09-21 | 1977-10-04 | Billion S.A. | Method of injection-moulding by injection of an article composed of at least three different materials |
GB2025838A (en) * | 1978-07-25 | 1980-01-30 | Seima | Injection Moulding Optical Reflectors |
JPS60168618A (en) * | 1984-02-14 | 1985-09-02 | Ube Ind Ltd | Manufacture of thick molded article made of thermoplastic resin |
EP0170594A2 (en) * | 1984-07-31 | 1986-02-05 | Nissei Asb Machine Co., Ltd. | Injection molding method for multi-layer bottomed parisons |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2622501B1 (en) * | 1987-10-29 | 1990-01-05 | Cibie Projecteurs | INJECTION MOLDING METHOD FOR THERMOPLASTIC MATERIAL, MOLDING COMPOSITION FOR PRODUCING AN OBJECT WITH MULTILAYER STRUCTURE AND OBJECT THUS PRODUCED, IN PARTICULAR REFLECTOR BODY |
-
1988
- 1988-12-12 FR FR8816307A patent/FR2640189B1/en not_active Expired - Lifetime
-
1989
- 1989-12-07 DE DE3940436A patent/DE3940436C2/en not_active Expired - Fee Related
- 1989-12-07 IT IT04863489A patent/IT1237237B/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4052497A (en) * | 1973-09-21 | 1977-10-04 | Billion S.A. | Method of injection-moulding by injection of an article composed of at least three different materials |
GB2025838A (en) * | 1978-07-25 | 1980-01-30 | Seima | Injection Moulding Optical Reflectors |
JPS60168618A (en) * | 1984-02-14 | 1985-09-02 | Ube Ind Ltd | Manufacture of thick molded article made of thermoplastic resin |
EP0170594A2 (en) * | 1984-07-31 | 1986-02-05 | Nissei Asb Machine Co., Ltd. | Injection molding method for multi-layer bottomed parisons |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 2 (M-444)[2059], 8 janvier 1986; & JP-A-60 168 618 (UBE KOSAN K.K.) 02-09-1985 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0328965A2 (en) * | 1988-02-13 | 1989-08-23 | Bayer Ag | Two-component injection-moulding composition containing polyarylene sulphide |
EP0328965A3 (en) * | 1988-02-13 | 1992-03-11 | Bayer Ag | Two-component injection-moulding composition containing polyarylene sulphide |
EP0658422A1 (en) * | 1993-12-14 | 1995-06-21 | Ems-Inventa Ag | Moulded article with a resistant surface |
WO1995020129A1 (en) * | 1994-01-22 | 1995-07-27 | Hella Kg Hueck & Co. | Strongly heat-resistant mouldings |
US5916649A (en) * | 1994-01-22 | 1999-06-29 | Hella Kg Hueck & Co. | Highly heat-resistant moldings |
WO1998009791A1 (en) * | 1996-09-04 | 1998-03-12 | The Dow Chemical Company | Composites of crystalline polymers |
US5798162A (en) * | 1996-09-04 | 1998-08-25 | The Dow Chemical Company | Composites of crystalline polymers |
Also Published As
Publication number | Publication date |
---|---|
FR2640189B1 (en) | 1991-01-18 |
IT1237237B (en) | 1993-05-27 |
DE3940436C2 (en) | 1998-04-09 |
DE3940436A1 (en) | 1990-06-13 |
IT8948634A0 (en) | 1989-12-07 |
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ST | Notification of lapse |