FR2474387A1 - Tools for making large thermo:formed mouldings - using residual mould cavity pressure to develop forming pressures against compression mould face - Google Patents
Tools for making large thermo:formed mouldings - using residual mould cavity pressure to develop forming pressures against compression mould face Download PDFInfo
- Publication number
- FR2474387A1 FR2474387A1 FR8001961A FR8001961A FR2474387A1 FR 2474387 A1 FR2474387 A1 FR 2474387A1 FR 8001961 A FR8001961 A FR 8001961A FR 8001961 A FR8001961 A FR 8001961A FR 2474387 A1 FR2474387 A1 FR 2474387A1
- Authority
- FR
- France
- Prior art keywords
- sheet
- tank
- compression
- frame
- crew
- 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- Withdrawn
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
- B29C51/10—Forming by pressure difference, e.g. vacuum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
La présente invention a pour objet un procédé de formage par compression de feuilles en matières plastiques de grandes dimensions et de toutes épaisseurs, et plus particulièrement un procédé de thermoformage auto-régulé en continu en une seule opération, ainsi que les appareils et produits en résultant. The subject of the present invention is a process for the compression forming of plastic sheets of large dimensions and all thicknesses, and more particularly a process for thermoforming which is self-regulating continuously in a single operation, as well as the apparatus and products resulting therefrom. .
Sont connus des appareils de formage sous vide et / ou sous pression. Ces appareils nécessitent des compresseurs d'appoint d'autant plus lourds, encombrants et chers, que le produit final demandé est de grande dimension. Vacuum and / or pressure forming devices are known. These devices require booster compressors that are all the heavier, bulky and expensive, the larger the final product requested.
Par rapport à ces appareils connus, la présente invention se propose de décrire un procédé simple et performant, permettant de réaliser des appareils de thermoformage de pièces de dimensions égales ou supérieures aux grandes dimensions atteintes jusque là, et cela sans compresseurs d'appoint et en toute fiabilité. Compared with these known devices, the present invention proposes to describe a simple and efficient process, making it possible to produce thermoforming devices for parts of dimensions equal to or greater than the large dimensions reached so far, and this without additional compressors and in all reliability.
Suivant le procédé, la pression nécessaire b la mise en forme de la feuille plastique est obtenue par l'empreinte à mouler au cours de son enfoncement à l'intérieur d'une enceinte creuse, dans laquelle un volume défini d'air initial est emprisonné de façon contrôlée par ladite feuille. According to the process, the pressure necessary for the shaping of the plastic sheet is obtained by the impression to be molded during its penetration inside a hollow enclosure, in which a defined volume of initial air is trapped in a controlled manner by said sheet.
Nous allons comprendre le procédé en décrivant un mode de réalisation d'un appareil utilisant ledit procédé ; appareil donné à titre non limitatif et schématisé sur les figures jointes. We will understand the method by describing an embodiment of an apparatus using said method; device given without limitation and shown schematically in the accompanying figures.
La figure I montre l'appareil en position haute. Figure I shows the device in the high position.
L'empreinte à mouler et son équipage suffisamment au-dessus de la cuve creuse, fermée de façon étanche par la feuille en matière plastique à mouler ; afin de permettre le passage par va et vient d'un dispositif de chauffage radian. The impression to be molded and its crew sufficiently above the hollow tank, closed in a sealed manner by the plastic sheet to be molded; to allow the passage by and from a radian heating device.
La figure z montre les mêmes éléments en position basse avec l'empreinte enfoncée dans la cuve et le moulage achevé. Figure z shows the same elements in the lower position with the impression pressed into the tank and the molding completed.
La figure I met en évidence un équipage constitué-par une empreinte 5 solidaire d'un support 6, montée articulée au-dessus d'un cadre 7 muni d'un dispositif de rappel et en liaison avec celui-ci. Cet équipage est animé par un vérin 10 porté sur un portique non représenté. On y voit aussi une cuve I creuse avec un bord extérieur supérieur plat 2, formant un appui annulaire, une feuille en matière plastique 4 est posée au-dessus du bord 2 et maintenue serrée de façon étanche à l'aide d'un cadre ,. La largeur du bord 2 est plus grande que celle du cadre 3 ; ce qui permet au cadre 7 de l'équipage de prendre appui sur la partie du bord 2 restant libre ; au moment de l'opération de compression par abaissement de l'équipage ledit cadre 7 s'arrête au niveau du bord supérieur de la cuve, alors que l'empreinte continue à descendre et à péneteer à l'intérieur de la cuve. L'ouverture centrale du cadre 7 est ajustée de façon à permettre le passage de l'empreinte avec le minimum de jeu intermédiaire. Le dispositif de rappel du support 6 solidAire de l'empreinte 5, est assuré à l'aide d'un montage à colonnes 8 et ressorts 9 ; lesdits ressorts trevaillent en poussée. Les extrémités des colonnes 8 sont évasées, formant des butées d'arrêt 12. Figure I highlights a team consisting of a footprint 5 secured to a support 6, hinged mounted above a frame 7 provided with a return device and in connection therewith. This crew is animated by a jack 10 carried on a gantry not shown. We also see a hollow tank I with a flat upper outer edge 2, forming an annular support, a plastic sheet 4 is placed above the edge 2 and kept tightly sealed using a frame, . The width of the edge 2 is greater than that of the frame 3; which allows the frame 7 of the crew to bear on the part of the edge 2 remaining free; at the time of the compression operation by lowering the crew, said frame 7 stops at the upper edge of the tank, while the imprint continues to descend and to penetrate inside the tank. The central opening of the frame 7 is adjusted so as to allow the passage of the impression with the minimum intermediate clearance. The return device of the support 6 solidAire of the imprint 5, is provided using a column mounting 8 and springs 9; said springs work in thrust. The ends of the columns 8 are flared, forming stop stops 12.
LU cadre 7 E sur effet d'empêcher la matière de se balonner et d'écleter le long de la périphérie au cours de l'opération de compression ; évitant ainsi une cause non négligeable de @einit,
Pendant le pén@@@ @@on de l'empreinte dans la cuve, l'air emprisonné dans celic@@@ passe d'une pression initiale PI à
une presslon @imale P@ @@@ucoup plus grande, aqssurane le mou- lage de la fenille, comme illustré sur la figure 2.LU frame 7 E on the effect of preventing the material from bouncing and bursting along the periphery during the compression operation; thus avoiding a significant cause of @einit,
During penetration of the cavity into the tank, the air trapped in celic @@@ changes from an initial pressure PI to
a much larger presslon @ @ @@@ aqssurane, aqssurane the molding of the fenille, as illustrated in figure 2.
Le precédé de @@@mage seion l'invention consiste donc essentiellement @ @@@primer la feuille que l'on désire former, directement par l'eir rêsiduel emprisonné dans la cuve le vo l@@e défini, au moyen de l'empreinte elle-même, la compression étant contionellement cnoissante et proportionnelle à la profondeur de la course de pénétration de l'empreinte venant en appui externe sur ladite feuille. The process of @@@ mage seion the invention therefore essentially consists of @ @@@ priming the sheet which one wishes to form, directly by the residual air trapped in the tank on defined vo, by means of the 'imprint itself, the compression being contionally cnoissant and proportional to the depth of the penetration stroke of the imprint coming into external support on said sheet.
Pxéelablement 5 la sompression finale, on exécute la série
nte d'opération
positionnement de la feuille 4 au-dessus de la cuve 2 ;
sonrege de celle-ci de façon étanche vis à vis du bord 2
à l'aide du cade de maintien
- chauffage de la feuille à la température de formage à
l'aide d'un dispositif radian amovible, ou déplaçable, port sur un charict ou autre moyen de transfert connu ; que l'on maintien au dessus de la feuille jusque l'apparition d'un début de bombage ; on retire alors l'élément chauffant.Pxéelablement 5 the final sompression, one carries out the series
nte of operation
positioning of the sheet 4 above the tank 2;
sound of the latter in a sealed manner with respect to the edge 2
using the holding pad
- heating of the sheet to the forming temperature at
using a removable or movable radian device, worn on a charict or other known transfer means; that is maintained above the sheet until the appearance of a beginning of bending; the heating element is then removed.
- on décomprime au moyen d'un-clapet ou un dispositif ana
orgue I- logé dans l'ouverture latérale B3 prévue sur la
cuve ; ledit clapet étant simplement référencé, mais
non représenté, car c1 est un moyen connu en soi g jusqu'à
ce que' la feuille prenne une forme en creux, de, profondeur
(résiduel) prévue de façon que le volume d'air emprisonné
restant soit alors sensiblement égal au volume de leempreinu
te obligatoirement par exces. - we decompress by means of a valve or an ana device
organ I- housed in the lateral opening B3 provided on the
tank; said valve being simply referenced, but
not shown, because c1 is a means known per se g up
that 'the sheet takes a hollow shape, of, depth
(residual) planned so that the volume of trapped air
remaining is then substantially equal to the volume of leempreinu
you necessarily by excess.
- il ne reste plus alors qu'à effectuer le formage par
compression comme il vient d'être décrit.- all that remains then is to carry out the forming by
compression as just described.
'est au cours de cette dernière opération que l'on effec- tue intégralement le formage par compression contrôlée graduellement croissante. It is during this latter operation that the forming by gradually increasing controlled compression is carried out in full.
Aux avantages précités on peut ajouter celui d'un gain d'énergie, et d'un gain de temps. To the aforementioned advantages one can add that of a saving of energy, and a saving of time.
L'intérêt majeur du procédé étant d'ouvrir une voie nouvelle d'obtention de pièces de grandes dimensions, il en résulte que les domaines d'application en sont nombreux. The major interest of the process being to open a new way of obtaining large parts, it follows that the fields of application are numerous.
En voici quelques exemples
- Coque et ailes d'un planeur
- Panneaux décoratifs ; faux plafonds ; prémoules pour
barrières ou soubassements dans le bâtiment - Planches à voile pour plusieurs personnes ; (grande
longueur) - Bassins de jardin ; Tables de laboratoire - Bacs pour acides, et/ou autres produits chimiques ou
alimentaires - Les Industries du Bâtiment, des Travaux Publics, Chimi
ques, t'éronautiques, Nautiques, Automobiles, etc, etc.... Here are some examples
- Hull and wings of a glider
- Decorative panels; false ceilings ; pre-molds for
barriers or bases in the building - Windsurfing for several people; (big
length) - Garden ponds; Laboratory tables - Containers for acids, and / or other chemicals or
industry - Building and Public Works Industries, Chimi
aeronautics, nautics, automobiles, etc, etc ...
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8001961A FR2474387A1 (en) | 1980-01-30 | 1980-01-30 | Tools for making large thermo:formed mouldings - using residual mould cavity pressure to develop forming pressures against compression mould face |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8001961A FR2474387A1 (en) | 1980-01-30 | 1980-01-30 | Tools for making large thermo:formed mouldings - using residual mould cavity pressure to develop forming pressures against compression mould face |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2474387A1 true FR2474387A1 (en) | 1981-07-31 |
Family
ID=9238014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8001961A Withdrawn FR2474387A1 (en) | 1980-01-30 | 1980-01-30 | Tools for making large thermo:formed mouldings - using residual mould cavity pressure to develop forming pressures against compression mould face |
Country Status (1)
Country | Link |
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FR (1) | FR2474387A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2633216A1 (en) * | 1988-06-24 | 1989-12-29 | Studiomobil Sarl | Press for stamping supports having a fragile face with action of a die on a single face |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1207019A (en) * | 1957-06-25 | 1960-02-12 | Du Pont | Process and apparatus for vacuum thermoforming |
FR1221878A (en) * | 1959-01-17 | 1960-06-07 | Saint Gobain | Method and devices for stamping plastic plates or sheets |
US2952875A (en) * | 1957-07-11 | 1960-09-20 | Coleman Co | Apparatus for the drawing of plastics |
US3218379A (en) * | 1963-01-02 | 1965-11-16 | Illinois Tool Works | Process and apparatus for forming plastic cups or the like |
US3568254A (en) * | 1968-09-19 | 1971-03-09 | Monsanto Co | Apparatus for deep draw molding |
US3713765A (en) * | 1970-10-22 | 1973-01-30 | D Rise | Differential pressure thermoforming apparatus for forming large articles such as trailer bodies and boats |
FR2278469A1 (en) * | 1973-12-03 | 1976-02-13 | Dow Chemical Co | PUNCH FOR FORMING THERMOPLASTIC MATERIALS AND PROCESS FOR MANUFACTURING HOLLOW BODIES INCLUDING THE USE |
-
1980
- 1980-01-30 FR FR8001961A patent/FR2474387A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1207019A (en) * | 1957-06-25 | 1960-02-12 | Du Pont | Process and apparatus for vacuum thermoforming |
US2952875A (en) * | 1957-07-11 | 1960-09-20 | Coleman Co | Apparatus for the drawing of plastics |
FR1221878A (en) * | 1959-01-17 | 1960-06-07 | Saint Gobain | Method and devices for stamping plastic plates or sheets |
US3218379A (en) * | 1963-01-02 | 1965-11-16 | Illinois Tool Works | Process and apparatus for forming plastic cups or the like |
US3568254A (en) * | 1968-09-19 | 1971-03-09 | Monsanto Co | Apparatus for deep draw molding |
US3713765A (en) * | 1970-10-22 | 1973-01-30 | D Rise | Differential pressure thermoforming apparatus for forming large articles such as trailer bodies and boats |
FR2278469A1 (en) * | 1973-12-03 | 1976-02-13 | Dow Chemical Co | PUNCH FOR FORMING THERMOPLASTIC MATERIALS AND PROCESS FOR MANUFACTURING HOLLOW BODIES INCLUDING THE USE |
Non-Patent Citations (1)
Title |
---|
EXBK/69 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2633216A1 (en) * | 1988-06-24 | 1989-12-29 | Studiomobil Sarl | Press for stamping supports having a fragile face with action of a die on a single face |
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ST | Notification of lapse |