FR2498905A1 - Moulding process for table top surround - consists of two moulds, with one containing curved sections - Google Patents
Moulding process for table top surround - consists of two moulds, with one containing curved sections Download PDFInfo
- Publication number
- FR2498905A1 FR2498905A1 FR8101983A FR8101983A FR2498905A1 FR 2498905 A1 FR2498905 A1 FR 2498905A1 FR 8101983 A FR8101983 A FR 8101983A FR 8101983 A FR8101983 A FR 8101983A FR 2498905 A1 FR2498905 A1 FR 2498905A1
- Authority
- FR
- France
- Prior art keywords
- plate
- tray
- surround
- table top
- periphery
- 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
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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/005—Compensating volume or shape change during moulding, in general
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
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- 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
- B29C45/1671—Making multilayered or multicoloured articles with an insert
-
- 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
- B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
- B29K2711/14—Wood, e.g. woodboard or fibreboard
Abstract
Description
La présente invention est relative à un procédé de surmoulage de l'entourage d'un plateau tel qu'un dessus de table et à de tels articles pourvus d'un entourage établi par mise en oeuvre du procédé précité. The present invention relates to a method of overmolding the surround of a tray such as a table top and to such articles provided with an entourage established by implementing the above method.
On sait que lorsqu'on fabrique une table, celle-ci comporte un plateau et un piètement assemblé à ce plateau. Ce dernier est généralement établi en bois du fait que ce matériau est bon marché et plus particulièrement au moyen d'une plaque réalisée par compression de copeaux, sciure ou analogue et qu'on trbuve dans le commerce sous la dénomination plaque de bois comprimé. Celle-ci comprend deux panneaux destinEs à constituer leurs faces supérieure et inférieure, mais leur pourtour ne comporte aucun revêtement de sorte que les fibres agglomérées sont visibles. Dans ces conditions il est nécessaire de masquer ledit pourtour par un entourage. Celui-ci est généralement réalisé sous la forme d'un profilé extrudé qui est collé ou embolté sur ledit pourtour. We know that when we make a table, it has a tray and a base assembled to this tray. The latter is generally made of wood because this material is inexpensive and more particularly by means of a plate produced by chip compression, sawdust or the like and which is found commercially under the name compressed wood plate. This comprises two panels intended to constitute their upper and lower faces, but their periphery has no coating so that the agglomerated fibers are visible. Under these conditions it is necessary to mask said periphery by an entourage. This is generally produced in the form of an extruded profile which is glued or embossed on said periphery.
Toutefois un tel entourage ne donne pas toute satisfaction car on assiste souvent à son décollage. En outre il n'est pas susceptible de réaliser l'étanchéité au niveau de la périphérie des panneaux.However, such an entourage is not entirely satisfactory because we often see it take off. In addition, it is not capable of sealing at the periphery of the panels.
On connais des entourages réalisés par surmoulage d'une matière plastique autour des plateaux considérés mais lorsque ceux-ci sont de grandes dimensions la longueur de l'entourage est très importante. Etant donné que le retrait de la matière plastique est de l'ordre de deux pour cent, si l'on a affaire par exemple à une table d'un mètre de diamètre le retrait de l'entourage après son moulage est de l'ordre de soixante mil limêtres. Ledit entourage subit donc des tensions internes élevées ai bien qu'aux changements de température ou autres conditions atmosphériques on assiste souvent à sa rupture. We know of entourages made by overmolding a plastic material around the plates considered but when these are large dimensions the length of the surround is very important. Since the shrinkage of the plastic material is of the order of two percent, if we are dealing for example with a table of one meter in diameter the shrinkage of the surround after its molding is of the order of sixty thousand limestones. Said entourage therefore undergoes high internal stresses ai although changes in temperature or other atmospheric conditions we often witness its rupture.
Les perfectionnements qui font l'objet de la présente invention visent à remédier aux inconvénients précités et à permettre la mise au point d'un procédé de surmoulage de l'entourage d'un plateau qui évite dans une très large mesure les retraits dont il a été question ci-dessus. The improvements which are the subject of the present invention aim to remedy the aforementioned drawbacks and to allow the development of a process for overmolding the surround of a plate which largely avoids the shrinkage which it has been question above.
Conformément à l'invention l'entourage du plateau est élaboré en deux phases, la première consistant à surmouler des arcs espacés dans un premier moule, tandis que la seconde est destinée à remplir les espaces vides dans un autre moule de manière a obtenir un profilé continu bordant le plateau. In accordance with the invention, the surround of the plate is produced in two phases, the first consisting in overmoulding spaced arcs in a first mold, while the second is intended to fill the empty spaces in another mold so as to obtain a profile. continuous bordering the plateau.
Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer
Fig. 1 illustre schématiquement un entourage surmoulé d'une seule pièce autour d'un plateau circulaire.The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is likely to provide
Fig. 1 schematically illustrates an entourage molded in one piece around a circular plate.
Fig. 2 montre les arcs espacés moulés durant la première phase du procédé suivant l'invention. Fig. 2 shows the spaced arcs molded during the first phase of the process according to the invention.
Fig. 3 est une vue semblable à celle de fig. 1, mais montrant l'entourage après la deuxième phase du procede. Fig. 3 is a view similar to that of FIG. 1, but showing the entourage after the second phase of the process.
Fig. 4 est une coupe partielle a plus grande échelle d'un plateau en bois aggloméré dont le pourtour comporte un entourage établi conformément à l'invention. Fig. 4 is a partial section on a larger scale of an agglomerated wooden tray, the periphery of which comprises an entourage established in accordance with the invention.
Fig. 5 est une vue semblable à celle de fig. 4, mais montrant une variante de réalisation du procédé suivant l'invention lorsque le plateau est non point en bois aggloméré, mais en bois ordinaire. Fig. 5 is a view similar to that of FIG. 4, but showing an alternative embodiment of the method according to the invention when the plate is not made of agglomerated wood, but ordinary wood.
On a représenté en fig. 1 un plateau circulaire 1 établi en une matière quelconque et autour duquel on a surmoulé un entourage 2 établi en une matière plastique de qualité appropriée. Comme indiqué plus haut si le plateau 1 présente un diamètre d'un mètre son périmètre est égal à plus de trois mètres de sorte qu'avec un retrait de deux pour cent de la matière plastique on obtient un retrait global d'environ soixante millimètres. Des tensions internes élevées naissent donc dans l'entourage 2, leur libération pouvant entraîner une rupture telle que celle 3, sous l'effet de forces illustrées par les flèches Fl, F2. On comprend aisément qu'une fois l'entourage détérioré il ne soit pas possible de le substituer sur place par un autre, ou de pratiquer une réparation. There is shown in fig. 1 a circular plate 1 made of any material and around which an entourage 2 has been molded made of a plastic of suitable quality. As indicated above if the plate 1 has a diameter of one meter, its perimeter is equal to more than three meters so that with a shrinkage of two percent of the plastic material, an overall shrinkage of about sixty millimeters is obtained. High internal tensions therefore arise in the surrounding 2, their release being able to cause a rupture such as that 3, under the effect of forces illustrated by the arrows F1, F2. It is easy to understand that once the environment has deteriorated it is not possible to replace it on the spot with another, or to make a repair.
Conformément au procédé suivant l'invention on commence a disposer le plateau 1 dans un moule de surmoulage qui comprend une cavité dont le pourtour coopère avec des arcs référencés la à lf de ce plateau, mais qui entre ceux-ci constitue des espaces libres de manière qu'une matière injectée dans ceux-ci vienne former par exemple six éléments courbes espacés, référencés 4 à 9, de l'entourage qu'on désire réaliser, lesdits éléments présentant en section transversale la forme définitive de cet entourage. La pièce ainsi réalisée est éjectée du moule de conformation pour être transfèrée dans un autre moule dans la cavité duquel cette pièce se centre par l'intermédiaire de la périphérie de ses éléments courbes de telle sorte qu'entre deux éléments voisins subsiste un vide qui va etre rempli par injection.Chacun des vides est comble par la matière plastique injectée dans le second moule de manière a constituer six liaisons référercées 10 à 15 entre les extrémités des éléments 4 a 9. In accordance with the process according to the invention, one begins to arrange the plate 1 in an overmolding mold which comprises a cavity whose periphery cooperates with arcs referenced la to lf of this plate, but which between them constitutes free spaces so that a material injected into them comes, for example, to form six spaced curved elements, referenced 4 to 9, of the surround which it is desired to produce, said elements having in cross section the final shape of this surround. The part thus produced is ejected from the shaping mold to be transferred to another mold in the cavity of which this part is centered by means of the periphery of its curved elements so that between two neighboring elements a vacuum remains which will be filled by injection. Each of the voids is filled with the plastic material injected into the second mold so as to constitute six links referenced 10 to 15 between the ends of the elements 4 to 9.
Cette seconde injection permet une solidarisation de tous les éléments constituant l'entourage du plateau 1 qui ne présentent en fin d'opération plus aucune solution de continuité. En outre la deuxième injection peut être exécutée avec une matière colorée différemment pour réaliser un effet décoratif.This second injection allows all the elements constituting the surround of the tray 1 to be joined together, which at the end of the operation no longer have any solution of continuity. Furthermore, the second injection can be carried out with a differently colored material to achieve a decorative effect.
Lorsque le plateau est réalisé en fibres comprimées ou bois stratifié sa périphérie comporte des alvéoles dans lesquelles la matière plastique s'ancre de telle sorte que les éléments 4 à 9 sont parfaitement solidarisés au plateau et ne risquent pas de s'en détacher pendant le transfert dans le second moule. Ce mode d'exécution illustré en fig. 4 montre la section transversale de l'entourage 16 du plateau réalisé conformément à l'invention. On observe que les deux arêtes du revêtement comportent chacune une lèvre 16a respectivement 16b prenant appui sur chacune des faces lg, lh du plateau 1. When the tray is made of compressed fibers or laminated wood, its periphery has cells in which the plastic material is anchored so that the elements 4 to 9 are perfectly secured to the tray and do not risk coming off during the transfer. in the second mold. This embodiment illustrated in fig. 4 shows the cross section of the surround 16 of the plate produced in accordance with the invention. It is observed that the two edges of the coating each have a lip 16a respectively 16b bearing on each of the faces lg, lh of the plate 1.
On a illustré en fig. 5 un autre mode d'exécution de l'entourage établi par mise en oeuvre du procédé suivant l'invention appliqué à un plateau 1' en bois naturel. Comme sa périphérie ne comporte pas d'alvéoles suffisants pour permettre l'ancrage de la matière plastique on ménage dans cette périphérie une dépression telle qu'une queue d'aronde 1'i dans laquelle la matière constitutive des éléments 4 à 9 et de leurs liaisons 10 a 15 vient se loger. On observe la lèvre inférieure 16'b de l'entoura- ge 16' qui prend appui sur la face inférieure l'h du plateau 1' tandis que la périphérie de la face 1'g comporte un décrochement 1'3 dans lequel l'entourage 16' vient s'ancrer, le haut de cet entourage étant préfèrablement à fleur de la face 1'g pour éviter toute retenue de déchets lorsqu'on essuie la table. Illustrated in fig. 5 another embodiment of the entourage established by implementing the method according to the invention applied to a tray 1 'in natural wood. As its periphery does not have sufficient cells to allow the anchoring of the plastic material, a depression is created in this periphery such as a dovetail 1'i in which the material constituting the elements 4 to 9 and their links 10 to 15 are housed. We observe the lower lip 16'b of the surround 16 'which bears on the lower face h of the plate 1' while the periphery of the face 1'g has a recess 1'3 in which the surrounding 16 'is anchored, the top of this surrounding being preferably flush with the face 1'g to avoid any retention of waste when wiping the table.
Il doit d'ailleurs être entendu que la description qui précède n'a été donnée qu'a titre d'exemple et qu'elle ne limite nullement le domaine de l'invention dont on ne sortirait pas en ramplaçant les détails d'exécution décrits par tous autres équivalents. It should moreover be understood that the above description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the details of execution described by all other equivalents.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8101983A FR2498905A1 (en) | 1981-01-30 | 1981-01-30 | Moulding process for table top surround - consists of two moulds, with one containing curved sections |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8101983A FR2498905A1 (en) | 1981-01-30 | 1981-01-30 | Moulding process for table top surround - consists of two moulds, with one containing curved sections |
Publications (1)
Publication Number | Publication Date |
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FR2498905A1 true FR2498905A1 (en) | 1982-08-06 |
Family
ID=9254745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8101983A Pending FR2498905A1 (en) | 1981-01-30 | 1981-01-30 | Moulding process for table top surround - consists of two moulds, with one containing curved sections |
Country Status (1)
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FR (1) | FR2498905A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0133651A2 (en) * | 1983-08-12 | 1985-03-06 | Max Meier | Compressed wood panel |
EP0224702A2 (en) * | 1985-11-26 | 1987-06-10 | WOCO Franz-Josef Wolf & Co. | Shaped plastic article incorporating surface-formed or inserted rubber-elastic parts |
FR2624787A1 (en) * | 1987-12-18 | 1989-06-23 | Esswein Sa | Method of manufacturing a framed composite panel, and panel resulting therefrom |
WO2004108388A1 (en) * | 2003-06-06 | 2004-12-16 | Ib Steiner | Method for binding wood base elements with plastic |
-
1981
- 1981-01-30 FR FR8101983A patent/FR2498905A1/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0133651A2 (en) * | 1983-08-12 | 1985-03-06 | Max Meier | Compressed wood panel |
EP0133651A3 (en) * | 1983-08-12 | 1986-09-10 | Max Meier | Compressed wood panel |
EP0224702A2 (en) * | 1985-11-26 | 1987-06-10 | WOCO Franz-Josef Wolf & Co. | Shaped plastic article incorporating surface-formed or inserted rubber-elastic parts |
EP0224702A3 (en) * | 1985-11-26 | 1988-06-08 | Woco Franz-Josef Wolf & Co. | Shaped plastic article incorporating surface-formed or inserted rubber-elastic parts |
FR2624787A1 (en) * | 1987-12-18 | 1989-06-23 | Esswein Sa | Method of manufacturing a framed composite panel, and panel resulting therefrom |
WO2004108388A1 (en) * | 2003-06-06 | 2004-12-16 | Ib Steiner | Method for binding wood base elements with plastic |
GB2418884A (en) * | 2003-06-06 | 2006-04-12 | Dipl-Ing Gottfried Steiner Ing | Method for binding wood base elements with plastic |
GB2418884B (en) * | 2003-06-06 | 2008-03-12 | Dipl-Ing Gottfried Steiner | Method for binding wood base elements with plastic |
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