ES2259484A1 - Roto welding of e.g. a synthetic tube in a roto forming mold comprises simultaneous fusion of the main and inner containers to form the main - Google Patents
Roto welding of e.g. a synthetic tube in a roto forming mold comprises simultaneous fusion of the main and inner containers to form the mainInfo
- Publication number
- ES2259484A1 ES2259484A1 ES200300214A ES200300214A ES2259484A1 ES 2259484 A1 ES2259484 A1 ES 2259484A1 ES 200300214 A ES200300214 A ES 200300214A ES 200300214 A ES200300214 A ES 200300214A ES 2259484 A1 ES2259484 A1 ES 2259484A1
- Authority
- ES
- Spain
- Prior art keywords
- roto
- walls
- tube
- mold
- molding
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 26
- 230000004927 fusion Effects 0.000 title claims abstract description 6
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 30
- 238000000465 moulding Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 238000007872 degassing Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 230000009471 action Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 230000010354 integration Effects 0.000 claims 1
- 238000001175 rotational moulding Methods 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 description 7
- -1 polyethylene Polymers 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- 238000010348 incorporation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/742—Forming a hollow body around the preformed part
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Procedimiento de roto-soldadura de un tubo o depósito auxiliar de material sintético en el interior de un depósito principal.Roto-welding procedure of a tube or auxiliary tank of synthetic material inside of a main deposit.
La presente invención se refiere a un procedimiento de roto-soldadura de un tubo o depósito auxiliar de polietileno en el interior de un depósito principal, haciendo referencia asimismo al depósito obtenido mediante la aplicación del presente procedimiento.The present invention relates to a broken-welding procedure of a tube or auxiliary polyethylene tank inside a tank principal, also referring to the deposit obtained by applying this procedure.
La presente invención está destinada a conseguir una unión más robusta que en el caso de realizar la soldadura de dichos tubo o depósito auxiliar en un proceso posterior con aportación de material y al mismo tiempo se reduce sensiblemente el tiempo de proceso para la obtención de la pieza final y, por lo tanto, su coste.The present invention is intended to achieve a more robust union than in the case of welding said auxiliary tube or reservoir in a subsequent process with material contribution and at the same time the processing time to obtain the final piece and, therefore So much, its cost.
El presente procedimiento está destinado en especial a los depósitos para transportar líquido que se asocian a tractores agrícolas y similares, estando destinados a alimentar unidades acopladas en disposición posterior a dicho depósito, por ejemplo, una unidad de pulverización, que es habitualmente accionada por una transmisión mecánica que se origina en el tractor. En estos casos se hace necesario que la barra de transmisión de movimiento, con sus uniones flexibles, pase a través del depósito de líquido, lo que se resuelve habitualmente por inserción de un tubo de polietileno en el interior de dicho depósito principal, para permitir el paso por su interior de dicho eje de impulsión.The present procedure is intended in special to the tanks to transport liquid that are associated with agricultural tractors and the like, being destined to feed units coupled in subsequent arrangement to said deposit, by example, a spray unit, which is usually driven by a mechanical transmission that originates in the tractor. In these cases it is necessary that the bar Motion transmission, with its flexible joints, pass through of the liquid reservoir, which is usually resolved by insertion of a polyethylene tube inside said main deposit, to allow the passage inside of said drive shaft
La soldadura de dicho tubo de polietileno o depósito auxiliar intermedio se realiza en un proceso posterior a la generación por roto-moldeo del depósito principal. Después de dejar enfriar el depósito, se taladra a la medida del tubo de polietileno o con la forma del depósito auxiliar para soldar posteriormente las dos piezas mediante un cordón de soldadura de polietileno.Welding of said polyethylene tube or intermediate auxiliary deposit is made in a process after the generation by broken-molding of the tank principal. After allowing the tank to cool, it is drilled to the Measurement of the polyethylene tube or with the shape of the auxiliary tank to subsequently weld the two pieces using a cord polyethylene welding.
Mediante la presente invención se consigue obtener la pieza final con el tubo o depósito auxiliar incorporado en el mismo proceso de roto-moldeo del depósito principal, con el consiguiente ahorro de tiempo de proceso, obteniendo costes inferiores de la pieza acabada y unas superiores características de estanqueidad en las uniones.The present invention achieves get the final piece with the tube or auxiliary tank incorporated in the same process of broken-molding of the tank main, with the consequent saving of process time, obtaining lower costs of the finished piece and superior ones sealing characteristics in the joints.
Mediante el procedimiento objeto de la invención se consigue un conjunto más robusto, ya que la unión se realiza mediante la integración de los materiales de las piezas y se consigue una pieza única por roto-moldeo, evitando la aportación posterior de material mediante soldadura que se añade al depósito ya obtenido.By the method object of the invention a more robust set is achieved, since the union is made by integrating the materials of the pieces and it get a unique piece by broken-molding, avoiding the subsequent contribution of material by welding which is added to the deposit already obtained.
El procedimiento de roto-soldadura integrada del depósito principal y del tubo insertado o depósito auxiliar, según la presente invención, permite obtener una distribución de gruesos más uniforme en todo el depósito principal ya que no son necesarios grosores superiores de las zonas de soldadura para asegurar una buena unión de los componentes.The procedure of integrated broken-weld of the main tank and of the inserted tube or auxiliary tank, according to the present invention, allows to obtain a more uniform thickness distribution throughout the main deposit since thicknesses are not necessary upper welding zones to ensure good bonding of the components.
Para su mejor comprensión se adjuntan, a título de ejemplo explicativo y no limitativo, unos dibujos representativos del procedimiento objeto de la presente invención.For your better understanding they are attached, by title an explanatory and non-limiting example, some drawings representative of the procedure object of the present invention.
Las figuras 1 y 2 son respectivamente una sección longitudinal y una sección transversal de un elemento tubular destinado a la fase de roto-moldeo.Figures 1 and 2 are respectively a section longitudinal and a cross section of a tubular element intended for the phase of broken-molding.
La figura 3 es una sección longitudinal en la que se representa el conjunto de las figuras 1 y 2 con acoplamiento del tubo de polietileno exterior y las tapas extremas.Figure 3 is a longitudinal section in the which represents the set of figures 1 and 2 with coupling of the outer polyethylene tube and the end caps.
La figura 4 muestra una sección en la que se observa el conjunto de la figura 3 en el que se han incorporado masas esponjosas en ambos extremos.Figure 4 shows a section in which look at the whole of figure 3 in which they have been incorporated spongy masses on both ends.
La figura 5 muestra una vista similar a la de la figura 4, apreciándose los efectos de la roto-soldadura y la evacuación de gases.Figure 5 shows a view similar to that of the Figure 4, appreciating the effects of the broken-welding and gas evacuation.
La figura 6 muestra un detalle en sección de la soldadura conseguida.Figure 6 shows a sectional detail of the welding achieved.
La figura 7 muestra una variante del proceso con piezas de taponado en los extremos.Figure 7 shows a variant of the process with plugging pieces at the ends.
La figura 8 muestra el conjunto de la figura 7 montado con tapas extremas previamente a la roto-soldadura.Figure 8 shows the assembly of Figure 7 mounted with end caps before the broken welding.
La figura 9 muestra junto con un detalle de la soldadura obtenida, el proceso de roto-soldadura.Figure 9 shows together with a detail of the obtained welding, the process of broken welding.
La figura 10 muestra el caso de un depósito auxiliar a incorporar en el depósito principal.Figure 10 shows the case of a deposit auxiliary to incorporate in the main deposit.
La figura 11 muestra el depósito auxiliar de la figura 10 con la incorporación de elementos para preparación para la roto-soldadura.Figure 11 shows the auxiliary tank of the Figure 10 with the incorporation of elements for preparation for The broken welding.
La figura 12 muestra un detalle de la soldadura obtenida en la fase de trabajo mostrada en la figura 11.Figure 12 shows a welding detail obtained in the work phase shown in figure 11.
Las figuras 13 y 14 muestran sendas secciones longitudinales esquemáticas de depósitos principales en los que se aprecia la incorporación por roto-soldadura, respectivamente, de un elemento tubular y de un depósito auxiliar.Figures 13 and 14 show sections longitudinal schematic of main deposits in which appreciate the incorporation by broken-welding, respectively, of a tubular element and a reservoir assistant.
Tal como se representa en las figuras, el procedimiento objeto de la presente invención parte de un tubo metálico (1) como alma o base de sujeción del tubo de plástico para evitar el pandeo en el proceso de roto-moldeo, observándose en la figura 1 la disposición de los tabiques internos (2) y (3) dotados de orificios (4) y (5) para desgasificado, en número variable, y orificios centrales (6) y (7) para la introducción de los tornillos de cierre que se explicarán más adelante.As depicted in the figures, the procedure object of the present invention part of a tube metallic (1) as the core or base for holding the plastic tube for avoid buckling in the broken-molding process, observing in figure 1 the arrangement of the internal partitions (2) and (3) equipped with holes (4) and (5) for degassing, in variable number, and central holes (6) and (7) for the introduction of the closing screws that will be explained further ahead.
Encima del elemento tubular metálico (1), se dispone el tubo de material plástico (8), por ejemplo de polietileno, colocando dichos elementos en el interior del molde del que se han representado las paredes (9) y (10).Above the metallic tubular element (1), it it has the plastic material tube (8), for example of polyethylene, placing said elements inside the mold of which the walls (9) and (10) have been represented.
Antes de ajustar el sistema se introducirán unas masas esponjosas entre el interior del tubo metálico y las paredes del molde, habiéndose representado mediante las masas (11) y (12) de la figura 4 para conseguir estanqueidad y facilitar la salida de gases hacia afuera del molde en el proceso de roto-moldeo a través de los orificios (4) y (5) de los separadores (2) y (3) y los orificios correspondientes (13) y (14), en número variable, de las paredes del molde.Before adjusting the system, some spongy masses between the inside of the metal tube and the walls of the mold, having been represented by the masses (11) and (12) of figure 4 to achieve tightness and facilitate the exit of gases out of the mold in the process of broken-molding through the holes (4) and (5) of the spacers (2) and (3) and the corresponding holes (13) and (14), in variable number, of the mold walls.
Los tubos y la fibra de vidrio quedarán fijados mediante tornillos (15) y (16) aprovechando los orificios roscados anteriormente explicados.The tubes and the fiberglass will be fixed by screws (15) and (16) taking advantage of the threaded holes previously explained.
A continuación, se añadirán los componentes plásticos necesarios en el interior y se efectuará el cierre del molde, con lo que se podrá realizar el proceso de roto-moldeo en el horno, adaptándose los componentes plásticos y el tubo a las paredes del molde por acción de la fuerza de gravedad al provocar que el material fundido quede dispuesto en la parte inferior del molde y combinarse con el movimiento de giro. Los gases generados y aire salen al exterior por los orificios anteriormente explicados. De este modo, se forma por roto-soldadura el depósito cuyas paredes se han indicado con los numerales (17) y (18) en la figura 5, con el tubo incorporado (19) que se basa fundamentalmente en el tubo (8) previamente insertado. El efecto de la roto-soldadura se aprecia en el detalle de la figura 6 en la que se observa que la pared tubular (19) forma una expansión (20) que se adapta contra la pared (10) del molde y se une a la pared (18) que forma la parte del depósito principal.Next, the components will be added plastics needed inside and the closure of the mold, with which the process of broken-mold in the oven, adapting the components plastics and the tube to the mold walls by force action of gravity by causing the molten material to be arranged in the bottom of the mold and combine with the turning movement. The generated gases and air go outside through the holes previously explained. In this way, it is formed by broken-welding tank whose walls have been indicated with numerals (17) and (18) in figure 5, with the tube incorporated (19) which is based primarily on the tube (8) previously inserted The effect of the broken-weld can be seen in the detail of the Figure 6 showing that the tubular wall (19) forms a expansion (20) that fits against the wall (10) of the mold and is joins the wall (18) that forms the part of the main tank.
De este modo, se consigue un depósito completo con un elemento tubular interno incorporado, tal como se ha mostrado en la figura 13, en la que se aprecia el depósito principal roto-moldeado (21) de la forma deseada, condicionada por la forma del molde de roto-moldeo y que lleva íntimamente incorporado interiormente un elemento tubular (22), que se corresponde con el elemento (19) representado en las figuras 5 y 6.In this way, a full deposit is achieved with a built-in internal tubular element, as it has been shown in figure 13, which shows the deposit broken-molded main (21) as desired, conditioned by the shape of the mold of broken-molding and which intimately incorporates an element internally tubular (22), which corresponds to the element (19) represented in figures 5 and 6.
En las figuras 7 a 12, se ha representado una variante del procedimiento, para montar el inserto a través de las paredes del molde, según la cual se acopla el elemento tubular de material plástico (23) sobre la parte exterior del tubo de acero (24), acoplándose en los extremos unos tapones de teflón o material similar (25), (26) dotados de orificios axiales (27) y (28) de desgasificación. La fase siguiente consiste en incorporar el conjunto representado en la figura 7 en el interior del molde que comprende las paredes (29) y (30) así como las tapas de cierre (31) y (32) dotadas de respectivos orificios de desgasificación (33) y (34) y fijadas mediante tornillos (35) y (36), en número variable a dichas paredes del molde (29) y (30).In Figures 7 to 12, a variant of the procedure, to mount the insert through the mold walls, according to which the tubular element of plastic material (23) on the outside of the steel tube (24), teflon or material plugs being fitted at the ends similar (25), (26) provided with axial holes (27) and (28) of degassing The next phase is to incorporate the assembly shown in figure 7 inside the mold that it comprises the walls (29) and (30) as well as the closing covers (31) and (32) equipped with respective degassing holes (33) and (34) and fixed by screws (35) and (36), in variable number a said mold walls (29) and (30).
Después de añadir los componentes de material
plástico adecuados, se procede al roto-moldeado,
dando salida a los gases por los orificios que se han explicado y
de manera que una vez finalizado el proceso se consigue la pieza
única roto-moldeada mostrada en la figura 9, en la
que el elemento tubular (37), que se basa fundamentalmente en el
elemento tubular (23) introducido en el molde, queda íntimamente
unido con las paredes (38) y (39) por fusión simultánea sobre las
caras interiores del molde formándose una expansión (40) similar a
la anteriormente explicada en la pieza tubular (37) que queda
unida a las paredes laterales del depósito principal fabricado de
manera
íntima.After adding the appropriate plastic material components, the rot-molding is carried out, the gases are expelled through the holes that have been explained and so that once the process is finished the single broken-molded piece shown in the figure is achieved 9, in which the tubular element (37), which is essentially based on the tubular element (23) introduced in the mold, is intimately joined with the walls (38) and (39) by simultaneous fusion on the inner faces of the mold forming an expansion (40) similar to that previously explained in the tubular part (37) that is attached to the side walls of the main tank manufactured in a manner
intimate
En el caso de desear la incorporación de un depósito auxiliar se procederá, tal como se ha representado en las figuras 10 a 12, observándose la disposición de dicho depósito auxiliar (41) que presentará entradas y salidas tales como (42) y (43) en el interior de un molde de paredes (44) y (45), incorporando una manta térmica (46) para evitar que el calor deforme el depósito, el cual queda colocado en el interior del molde representado por las paredes (47) y (48). A continuación, se disponen las tapas (49) y (50), aislantes del calor, que se adaptan a los extremos del depósito auxiliar, presentando aberturas preferentemente dotadas de tapones porosos (51) y (52) para desgasificación. Después de añadir los componentes plásticos necesarios, se cierra el molde y se efectúa el proceso de roto-moldeo consiguiéndose una estructura tal como se aprecia en las figuras 11 y 12, similar a la representada en los casos anteriores en la que los materiales plásticos añadidos forman las paredes internas (53) y (54) del depósito principal al cual se habrá integrado el depósito auxiliar, observándose la formación de expansión de soldadura tal como la indicada con el numeral (55) en el detalle de la figura 12.In the case of wishing to incorporate a Auxiliary deposit will proceed, as depicted in the Figures 10 to 12, observing the disposition of said deposit auxiliary (41) that will present inputs and outputs such as (42) and (43) inside a mold of walls (44) and (45), incorporating a thermal blanket (46) to prevent heat deformed the deposit, which is placed inside the mold represented by the walls (47) and (48). Then it they have the covers (49) and (50), heat insulating, which adapt to the ends of the auxiliary tank, presenting openings preferably provided with porous plugs (51) and (52) for degassing After adding the plastic components necessary, the mold is closed and the process of broken-molding getting a structure such as it can be seen in figures 11 and 12, similar to that represented in the previous cases in which the plastic materials added they form the internal walls (53) and (54) of the main tank at which will have integrated the auxiliary tank, observing the weld expansion formation such as indicated with the numeral (55) in the detail of figure 12.
De este modo se consigue un depósito tal como el representado en la figura 14, en el que se ha representado con el numeral (56) en el que se aprecia el depósito auxiliar incorporado (57) mediante este método de roto-moldeo.In this way a deposit such as the represented in figure 14, in which it has been represented with the numeral (56) in which the built-in auxiliary tank is visible (57) by this method of roto-molding.
Si bien la invención se ha explicado a título de ejemplo no limitativo con la incorporación por rotomoldeo de elementos tubulares en el interior de un depósito principal o también con la incorporación de depósitos auxiliares, se comprenderá que la misma puede ser aplicada de igual modo a otras realizaciones prácticas que utilizarán los principios básicos que se han dado a conocer en la presente invención y, por lo tanto, quedarán incluidas dentro del alcance de la misma. Así, por ejemplo, se podría aplicar la presente invención a otro tipo de insertos o elementos postizos de estructura distinta a un elemento tubular y con finalidades distintas a las de permitir el paso de ejes u otros elementos, así, por ejemplo, se podría aplicar a la obtención de cavidades accesibles desde el exterior para almacenamiento de productos o herramientas o cualesquiera otras realizaciones similares.While the invention has been explained by way of non-limiting example with the incorporation by rotational molding of tubular elements inside a main tank or also with the incorporation of auxiliary deposits, it understand that it can be applied equally to others practical realizations that will use the basic principles that have been disclosed in the present invention and therefore will be included within the scope of it. So by For example, the present invention could be applied to another type of inserts or false elements of structure other than an element tubular and for purposes other than allowing the passage of axes or other elements, so, for example, could be applied to the Obtaining cavities accessible from outside to storage of products or tools or any other similar realizations.
Todo cuanto no afecte, altere, cambie o modifique la esencia del procedimiento descrito, será variable a los efectos de la presente invención.Everything that does not affect, alter, change or modify the essence of the procedure described, it will be variable to The effects of the present invention.
Claims (7)
terno.2. Roto-welding process, according to claim 1, characterized by the arrangement of a metal tube that has the synthetic material tube mounted externally, between the opposite walls of the mold of broken-molding, proceeding to add inside the mold the additional synthetic materials and by breaking-molding to jointly achieve the inner walls of the manufactured main tank in which the tube of synthetic material incorporated into the metal tube will be integrated by simultaneous fusion of material, forming a main tank integrated with the inner tube of synthetic material incorporated and subsequently proceeding, after disassembly of the walls of the mold of broken-molding, to the disassembly of the metal tube in-
Terno
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200300214A ES2259484B1 (en) | 2003-01-29 | 2003-01-29 | BREAK-WELDING PROCEDURE OF A TUBE OR AUXILIARY DEPOSIT OF SYNTHETIC MATERIAL INSIDE A MAIN DEPOSIT. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200300214A ES2259484B1 (en) | 2003-01-29 | 2003-01-29 | BREAK-WELDING PROCEDURE OF A TUBE OR AUXILIARY DEPOSIT OF SYNTHETIC MATERIAL INSIDE A MAIN DEPOSIT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2259484A1 true ES2259484A1 (en) | 2006-10-01 |
| ES2259484B1 ES2259484B1 (en) | 2007-10-16 |
Family
ID=37054756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES200300214A Expired - Fee Related ES2259484B1 (en) | 2003-01-29 | 2003-01-29 | BREAK-WELDING PROCEDURE OF A TUBE OR AUXILIARY DEPOSIT OF SYNTHETIC MATERIAL INSIDE A MAIN DEPOSIT. |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES2259484B1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2959820A (en) * | 1957-02-07 | 1960-11-15 | Theodore A Miller | Method of rotationally molding hollow articles having internally formed reinforcement from plastisol |
| US3081493A (en) * | 1959-05-28 | 1963-03-19 | Beyer-Olsen Knut | Method for making by rotary casting a buoyant body of plastic furnished with a passage therethrough |
| GB2222548A (en) * | 1988-09-09 | 1990-03-14 | Lin Pac Mouldings | Inserts in rotationally moulded articles |
| EP0503253A1 (en) * | 1991-03-12 | 1992-09-16 | RHEIN-BONAR KUNSTSTOFF-TECHNIK GmbH | Rotation-moulded, closed plastic container with wash plate and/or partition panel |
| GB2256632A (en) * | 1991-06-11 | 1992-12-16 | C Dax Systems Ltd | Moulded winding reel |
-
2003
- 2003-01-29 ES ES200300214A patent/ES2259484B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2959820A (en) * | 1957-02-07 | 1960-11-15 | Theodore A Miller | Method of rotationally molding hollow articles having internally formed reinforcement from plastisol |
| US3081493A (en) * | 1959-05-28 | 1963-03-19 | Beyer-Olsen Knut | Method for making by rotary casting a buoyant body of plastic furnished with a passage therethrough |
| GB2222548A (en) * | 1988-09-09 | 1990-03-14 | Lin Pac Mouldings | Inserts in rotationally moulded articles |
| EP0503253A1 (en) * | 1991-03-12 | 1992-09-16 | RHEIN-BONAR KUNSTSTOFF-TECHNIK GmbH | Rotation-moulded, closed plastic container with wash plate and/or partition panel |
| GB2256632A (en) * | 1991-06-11 | 1992-12-16 | C Dax Systems Ltd | Moulded winding reel |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2259484B1 (en) | 2007-10-16 |
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