FR2581587A1 - Process for manufacturing walls made from plastic material and having large dimensions and improved flatness, and products obtained - Google Patents
Process for manufacturing walls made from plastic material and having large dimensions and improved flatness, and products obtained Download PDFInfo
- Publication number
- FR2581587A1 FR2581587A1 FR8507133A FR8507133A FR2581587A1 FR 2581587 A1 FR2581587 A1 FR 2581587A1 FR 8507133 A FR8507133 A FR 8507133A FR 8507133 A FR8507133 A FR 8507133A FR 2581587 A1 FR2581587 A1 FR 2581587A1
- Authority
- FR
- France
- Prior art keywords
- frame
- plastic
- plastic material
- improved flatness
- wall
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/70—Completely encapsulating inserts
-
- 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
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/688—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks the inserts being meshes or lattices
Abstract
Description
L'invention a pour objet un procédé de fabrication de parois en matière plastique de grandes dimensions et de planéité améliorée, ainsi que des produits tels que caisses et palettes comportant de telles parois. The subject of the invention is a method for manufacturing walls of plastic material of large dimensions and improved flatness, as well as products such as boxes and pallets comprising such walls.
Les matières plastiques, en particulier, pour la fabrication de caisses, conteneurs, palettes, etc... Plastics, in particular, for the manufacture of cases, containers, pallets, etc.
présentent de grands avantages d'emploi, en particulier quant à l'hygiène, l'étanchéité, la tenue aux intempéries, la durée de vie, le poids,
Par contre, les matières plastiques présentent comme inconvénients, une relative faiblesse de résistance, notamment à la torsion et à la flexion, et un défaut de planéité des parois qui fléchissent et se bombent sous charge, ou en fonction de conditions climatiques différentes.have great advantages of use, in particular as regards hygiene, sealing, weathering, service life, weight,
By cons, plastics have as disadvantages, a relative weakness of resistance, in particular to torsion and to bending, and a defect of flatness of the walls which flex and bulge under load, or according to different climatic conditions.
Pour obvier à ces inconvénients, on a bien entendu, proposé d'armer les matières plastiques, en y insérant des armatures métalliques ou en bois. Mais ces opérations présentent de graves difficultés. To overcome these drawbacks, it has of course been proposed to arm the plastics, by inserting metal or wooden frames. But these operations present serious difficulties.
En effet, dans la pratique, il n'est pas possible de surmouler certaines matières plastiques par dessus une armature métallique rigide, compte-tenu du très fort retrait de la matière plastique lors du refroidissement, conduisant à une fissuration sous contrainte de la matière plastique. En conséquence, lorsqu'on veut armer des matières plastiques, on prévoit généralement des passages ou canaux dans la matière plastique , dans lesquels canaux on loge les armatures avec un certain jeu. De telles opérations sont cependant délicates, au niveau de la fabrication. En outre, elles nécessitent d'obturer correctement les orifices d'introduction des armatures. Elles empêchent également d'obtenir une bonne cohésion de l'armature qui ne peut être réalisée en une seule pièce. Indeed, in practice, it is not possible to overmold certain plastic materials over a rigid metal frame, given the very strong shrinkage of the plastic during cooling, leading to stress cracking of the plastic . Consequently, when it is desired to reinforce plastics, provision is generally made for passages or channels in the plastic, in which channels the reinforcements are housed with a certain clearance. However, such operations are delicate, at the manufacturing level. In addition, they require that the reinforcement insertion holes be properly closed. They also prevent obtaining a good cohesion of the reinforcement which cannot be produced in one piece.
Des problèmes semblables se posent avec des armatures en bois, avec une difficulté supplémentaire provenant de ce que le bois peut gonfler considérablement s'il est en contact d'une forte humidité ; dans ce cas, les armatures en bois font éclater la paroi plastique qui les enrobe; et l'étanchéité est difficile à obtenir, puisque la matière plastique ne peut être surmoulée sur les armatures. Similar problems arise with wooden frames, with an additional difficulty that the wood can swell considerably if it is in contact with high humidity; in this case, the wooden frames burst the plastic wall which coats them; and sealing is difficult to obtain, since the plastic cannot be overmolded on the frames.
Conformément à l'invention, les difficultés susmentionnées sont résolues de La façon suivante :
On réalise d'abord une structure d'armature, par exemple métallique, comportant au moins un encadrement de dimensions Légèrement inférieures à celles de la paroi à fabriquer. On surmoule ensuite, par dessus cette armature, la matière plastique qui constituera ladite paroi dans laquelle ladite armature sera noyée, cette opération étant faite en choisissant une matière plastique de qualité peu sujette à la fissuration sous contrainte, telle que par exemple un polypropylène ou d'un de ses copolymères tel qu'un copolymère d'éthylène et de propylène.Lorsque la matière surmoulée se refroidit, elle tend à subir un retrait qui, normalement, serait de L'ordre de 1,5 X, mais le retrait étant limité par l'armature, le panneau plastique est précontraint en tension sur l'armature. Convenablement dosée cette précontrainte n'a pas d'inconvénient puisque La matière n'est pas sujette à fissuration sous contrainte. Par contre, elle présente le gros avantage que la paroi étant sous tension, elle prend automatiquement une configuration plane qui va être conservée dans le temps, augmentant simultanément la résistance à la déformation des pièces, caisses, conteneurs, etc... comprenant de telles parois précontraintes. In accordance with the invention, the above-mentioned difficulties are resolved in the following manner:
First an armature structure, for example metallic, is produced, comprising at least one frame of dimensions slightly smaller than those of the wall to be manufactured. The plastic material which will constitute said wall in which said reinforcement will be embedded is then molded over this frame, this operation being done by choosing a quality plastic material little subject to stress cracking, such as for example polypropylene or '' one of its copolymers such as a copolymer of ethylene and propylene. When the overmolded material cools, it tends to undergo a shrinkage which, normally, would be of the order of 1.5 X, but the shrinkage being limited by the frame, the plastic panel is prestressed in tension on the frame. Properly proportioned, this prestress has no disadvantage since the material is not subject to cracking under stress. On the other hand, it has the great advantage that the wall being under tension, it automatically takes on a planar configuration which will be preserved over time, simultaneously increasing the resistance to deformation of the parts, cases, containers, etc. comprising such prestressed walls.
La mise en oeuvre de L'invention apparaftra plus clairement à l'aide de la description qui va suivre faite en référence aux dessins annexés dans lesquels
- la figure I montre en vue perspective une paroi armée réalisée conformément à l'invention ;
- la figure 2 est une vue en coupe à plus grande échelle d'un détail faite sensiblement selon le plan Il-Il de la figure 1 ;
- la figure 3 montre, de façon schématique et selon une variante, un mode de réalisation de L'armature et de jonction dans un angle tel que répéré ICI à la figure 1.The implementation of the invention will appear more clearly with the aid of the description which will follow made with reference to the accompanying drawings in which
- Figure I shows a perspective view of a reinforced wall produced in accordance with the invention;
- Figure 2 is a sectional view on a larger scale of a detail made substantially along the plane Il-Il of Figure 1;
- Figure 3 shows, schematically and according to a variant, an embodiment of the frame and junction at an angle as shown HERE in Figure 1.
Selon la réalisation illustrée à la figure 1, on a d'abord préparé une armature 1, par# exemple, métallique, formée par un cadre sensiblement rectangulaire fermé à angles arrondis. L'armature 1 a été rigidifiée et renforcée par quatre barres en croix selon la médiane des côtés disposés face à face du cadre 1. Toute l'armature peut être réalisée par exemple en profilés métalliques soudés, à sections pleines ou tubulaires. According to the embodiment illustrated in Figure 1, we first prepared a frame 1, for example, metallic, formed by a substantially rectangular frame closed with rounded angles. The frame 1 has been stiffened and reinforced by four cross bars along the median of the sides arranged face to face of the frame 1. The whole frame can be produced for example from welded metal profiles, with solid or tubular sections.
Ensuite, sur cette armature on surmoule, dans un moule convenable la paroi en matière plastique proprement dite repérée 3 à la figure 1. Le choix de cette matière plastique est important, car il faut éviter que lors du retrait de la matière plastique au refroidissement, celle-ci se fissure sous l'effet des contraintes de retrait. Then, on this frame, the plastic wall proper, marked 3 in FIG. 1, is overmolded in a suitable mold. The choice of this plastic material is important, because it is necessary to avoid that when the plastic material is removed during cooling, it cracks under the effect of shrinkage stresses.
A cet effet, on choisit avantageusement une matière telle qu'un copolymère de propylène et d'éthylène peu sujet à fissuration sous contrainte. D'autres compositions plastiques appropriées équivalentes peuvent être déterminées par L'homme de L'art. To this end, a material such as a copolymer of propylene and ethylene that is not subject to stress cracking is advantageously chosen. Other suitable equivalent plastic compositions may be determined by those skilled in the art.
A la figure 2, on a montre à plus grande échelle la section particulière du profilé 1 tubulaire circulaire et la section particulière de la matière plastique d'enrobage. Dans l'exemple illustré à la figure 1, la paroi a un aspect en treillis ou grille ; il est évident ce#pen dant que l'on peut tout aussi bien et selon la même technique surmouler sur l'armature 1,2 un panneau plein pour former le panneau final 4 précontraint armé de l'invention. In Figure 2, there is shown on a larger scale the particular section of the circular tubular profile 1 and the particular section of the plastic coating. In the example illustrated in Figure 1, the wall has a lattice or grid appearance; it is obvious that during this one can just as well and according to the same technique overmold on the frame 1,2 a solid panel to form the final panel 4 prestressed reinforced with the invention.
Du fait de l'action de mise sous contrainte du panneau, l'armature peut être réalisée, comme illustré à la figure 3, au moyen de plusieurs profilés 5, simplement assemblés entre-eux à des endroits convenables, tels que les angles, par des pièces formant clavettes, telle que 6, d'assemblage. La clavette 6 peut être constituée par une pièce plastique venant simplement s'engager par ses extrémités dans les profilés 5 adjacents en les réunissant de façon aussi continue que possible, de manière à éviter la création d'angles ou retraits néfastes. Due to the stressing action of the panel, the reinforcement can be produced, as illustrated in FIG. 3, by means of several profiles 5, simply assembled together at suitable locations, such as the angles, by parts forming keys, such as 6, for assembly. The key 6 can be constituted by a plastic part which simply engages by its ends in the adjacent sections 5 by bringing them together as continuously as possible, so as to avoid the creation of harmful angles or withdrawals.
De la description qui précède, il apparat que l'on pourra construire de la sorte, toute sorte de pièces et notamment des caisses, conteneurs, palettes, comprenant une ou plusieurs telles parois armées à résistance accrue et planéité améliorée. From the above description, it appears that it will be possible to build in this way, all kinds of parts and in particular cases, containers, pallets, comprising one or more such reinforced walls with increased resistance and improved flatness.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8507133A FR2581587B1 (en) | 1985-05-10 | 1985-05-10 | METHOD FOR MANUFACTURING LARGE SIZE PLASTIC WALLS, AND IMPROVED PLANEITY, AND PRODUCTS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8507133A FR2581587B1 (en) | 1985-05-10 | 1985-05-10 | METHOD FOR MANUFACTURING LARGE SIZE PLASTIC WALLS, AND IMPROVED PLANEITY, AND PRODUCTS |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2581587A1 true FR2581587A1 (en) | 1986-11-14 |
FR2581587B1 FR2581587B1 (en) | 1987-09-11 |
Family
ID=9319161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8507133A Expired FR2581587B1 (en) | 1985-05-10 | 1985-05-10 | METHOD FOR MANUFACTURING LARGE SIZE PLASTIC WALLS, AND IMPROVED PLANEITY, AND PRODUCTS |
Country Status (1)
Country | Link |
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FR (1) | FR2581587B1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0261681A2 (en) * | 1986-09-24 | 1988-03-30 | InterMetro Industries Corporation | Composite article, such as a shelf or the like, and method for making same |
FR2611966A1 (en) * | 1987-03-05 | 1988-09-09 | Allibert Sa | Display panel of a temporary nature |
EP0431777A1 (en) * | 1989-12-04 | 1991-06-12 | British Gas plc | Cover for trenches |
FR2759673A1 (en) * | 1997-02-14 | 1998-08-21 | Groupe Maillard Ind Gmi | WALL OR PART OF A WALL FOR CONTAINER, CORRESPONDING CONTAINER AND METHOD FOR MANUFACTURING SUCH WALL OR PART OF WALL |
EP1874660A2 (en) * | 2004-12-30 | 2008-01-09 | 3DM Worldwide PLC | Collapsible shipping container with plasticized composition formed about a skeletal structure |
GB2576352A (en) * | 2018-08-16 | 2020-02-19 | Martin Botham Dale | Cargo container flat side wall |
WO2020035459A1 (en) * | 2018-08-16 | 2020-02-20 | Maersk Container Industry A/S | Cooling/intermodal container, method of assembling a cooling/intermodal container and extruder head |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1477501A (en) * | 1966-01-20 | 1967-04-21 | molded element fitted with a frame | |
US3467741A (en) * | 1967-11-17 | 1969-09-16 | Gen Motors Corp | Method of making a shelf front |
DE1629523A1 (en) * | 1966-11-09 | 1971-02-04 | Frank Willi | Process for coating profiles, frames and the like made of wood or other materials with casting resin |
FR2103488A1 (en) * | 1970-08-25 | 1972-04-14 | Amervac Ind Inc | |
FR2240152A1 (en) * | 1973-08-07 | 1975-03-07 | Ici Ltd | |
FR2257400A1 (en) * | 1974-01-14 | 1975-08-08 | Bridgend Investments Ltd | |
GB1430579A (en) * | 1972-06-21 | 1976-03-31 | Gkn Sankey Ltd | |
GB1433135A (en) * | 1972-05-12 | 1976-04-22 | Permali Ltd | Moulded articles which are internally reinforced with inserts |
AT365946B (en) * | 1980-07-07 | 1982-02-25 | Semperit Ag | POLYURETHANE ITEM |
LU82944A1 (en) * | 1980-11-18 | 1982-06-30 | Plastic Omnium Cie | PROCESS FOR THE MANUFACTURE BY MOLDING OF PARTS OF PLASTIC MATERIAL, PARTICULARLY OF PARTS OF LARGE DIMENSIONS |
-
1985
- 1985-05-10 FR FR8507133A patent/FR2581587B1/en not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1477501A (en) * | 1966-01-20 | 1967-04-21 | molded element fitted with a frame | |
DE1629523A1 (en) * | 1966-11-09 | 1971-02-04 | Frank Willi | Process for coating profiles, frames and the like made of wood or other materials with casting resin |
US3467741A (en) * | 1967-11-17 | 1969-09-16 | Gen Motors Corp | Method of making a shelf front |
FR2103488A1 (en) * | 1970-08-25 | 1972-04-14 | Amervac Ind Inc | |
GB1433135A (en) * | 1972-05-12 | 1976-04-22 | Permali Ltd | Moulded articles which are internally reinforced with inserts |
GB1430579A (en) * | 1972-06-21 | 1976-03-31 | Gkn Sankey Ltd | |
FR2240152A1 (en) * | 1973-08-07 | 1975-03-07 | Ici Ltd | |
FR2257400A1 (en) * | 1974-01-14 | 1975-08-08 | Bridgend Investments Ltd | |
AT365946B (en) * | 1980-07-07 | 1982-02-25 | Semperit Ag | POLYURETHANE ITEM |
LU82944A1 (en) * | 1980-11-18 | 1982-06-30 | Plastic Omnium Cie | PROCESS FOR THE MANUFACTURE BY MOLDING OF PARTS OF PLASTIC MATERIAL, PARTICULARLY OF PARTS OF LARGE DIMENSIONS |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0261681A2 (en) * | 1986-09-24 | 1988-03-30 | InterMetro Industries Corporation | Composite article, such as a shelf or the like, and method for making same |
EP0261681A3 (en) * | 1986-09-24 | 1989-04-19 | InterMetro Industries Corporation | Composite article, such as a shelf or the like, and method for making same |
FR2611966A1 (en) * | 1987-03-05 | 1988-09-09 | Allibert Sa | Display panel of a temporary nature |
EP0431777A1 (en) * | 1989-12-04 | 1991-06-12 | British Gas plc | Cover for trenches |
FR2759673A1 (en) * | 1997-02-14 | 1998-08-21 | Groupe Maillard Ind Gmi | WALL OR PART OF A WALL FOR CONTAINER, CORRESPONDING CONTAINER AND METHOD FOR MANUFACTURING SUCH WALL OR PART OF WALL |
EP0860367A1 (en) * | 1997-02-14 | 1998-08-26 | Groupe Maillard Industrie En Abrégé GMI,(Société Anonyme) | Container wall or part thereof, container, and method of making such a wall or part thereof |
EP1874660A2 (en) * | 2004-12-30 | 2008-01-09 | 3DM Worldwide PLC | Collapsible shipping container with plasticized composition formed about a skeletal structure |
EP1874660A4 (en) * | 2004-12-30 | 2009-07-22 | 3Dm Worldwide Plc | Collapsible shipping container with plasticized composition formed about a skeletal structure |
EP2206660A2 (en) * | 2004-12-30 | 2010-07-14 | Oria Collapsibles, LLC | Mold process for creating a collapsible cargo carrying enclosure |
US7763200B2 (en) | 2004-12-30 | 2010-07-27 | Oria Collapsibles, Llc | Method and associated mold process for creating a collapsible cargo carrying enclosure |
EP2206660A3 (en) * | 2004-12-30 | 2010-12-15 | Oria Collapsibles, LLC | Mold process for creating a collapsible cargo carrying enclosure |
GB2576352A (en) * | 2018-08-16 | 2020-02-19 | Martin Botham Dale | Cargo container flat side wall |
WO2020035459A1 (en) * | 2018-08-16 | 2020-02-20 | Maersk Container Industry A/S | Cooling/intermodal container, method of assembling a cooling/intermodal container and extruder head |
Also Published As
Publication number | Publication date |
---|---|
FR2581587B1 (en) | 1987-09-11 |
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