WO2007010061A1

WO2007010061A1 - Agricultural and urban plastic recycling method

Info

Publication number: WO2007010061A1
Application number: PCT/ES2006/000332
Authority: WO
Inventors: José MAURI CHACÓN
Original assignee: Inversiones Y Gestion Orice Sl
Current assignee: Inversiones Y Gestion Orice Sl
Priority date: 2005-07-21
Filing date: 2006-06-01
Publication date: 2007-01-25
Anticipated expiration: 2008-01-21
Also published as: ES2277753B1; ES2277753A1

Abstract

The invention relates to a method for the recycling of agricultural and urban plastics. The inventive method comprises the following steps: (1) the plastics are classified, screened and blow cleaned, without requiring the use of water, thereby eliminating pollutant discharges; (2) the plastics are conveyed to a grinding machine; (3) the ground plastics are transferred into a rotary autoclave for heating and are subsequently poured onto a volumetric scale from where they are conveyed to a hydraulic press in which the moulds are subjected to heat and pressure; and (4) once the desired density has been obtained, the plates are released and stored. The invention is characterised in that said method can be used to create a product using different types of plastics without said plastics having to be pre-washed with water, but simply dry cleaned using a screen and an air-injection system which, by means of rapping, eliminates a large part of the dirt associated with plastics.

Description

PROCESO DE RECICLAJE DE PLÁSTICOS AGRÍCOLAS Y URBANOSRECYCLING PROCESS OF AGRICULTURAL AND URBAN PLASTICS

AntecedentesBackground

Los procesos existentes en estos momentos cuentan con unas etapas de lavado que además de aumentar los costes de fabricación producen unas aguas residuales que son contaminantes para el medio ambiente.The existing processes at the moment have washing stages that, in addition to increasing manufacturing costs, produce wastewater that is polluting for the environment.

Con esta nueva invención se logra un nuevo sistema innovador que contribuye a acabar con el problema ecológico que supone el abandono de los plásticos agrícolas, así como un tratamiento respetuoso con el medio ambiente y económicamente viable por eliminar una serie de costea que hasta ahora se vienen dando en otros procesos de reciclaje de plásticos.With this new invention, a new innovative system is achieved that helps to end the ecological problem of abandoning agricultural plastics, as well as an environmentally friendly and economically viable treatment to eliminate a series of costs that so far have come giving in other processes of recycling of plastics.

Descripción detallada de Ia invenciónDetailed description of the invention

1. Los plásticos seleccionados para el proceso de reciclaje son los residuos plásticos agrícolas y urbanos.1. The plastics selected for the recycling process are agricultural and urban plastic waste.

2. Los plásticos, una vez decepcionados en la planta, son clasificados según densidades y pasados a las cribas y soplado para la limpieza de los mimos.2. The plastics, once disappointed in the plant, are classified according to densities and passed to the screens and blown for the cleaning of the mimes.

3. Los plásticos pasas a un molino triturador.3. Plastics go to a grinder mill.

4. Los plásticos, una vez triturados, pasarían a una autoclave giratoria en cuyo interior se someterá calor para reblandecerlo y así lograr una fácil maleabilidad del producto plástico que es vertido en el molde para ser sometido a calor y presión por una prensa hidráulica cuya placa de base y placa de empuje superior estarán provistas de resistencias eléctricas incandescentes.4. The plastics, once crushed, would pass to a rotating autoclave inside which heat will be submitted to soften it and thus achieve an easy malleability of the plastic product that is poured into the mold to be subjected to heat and pressure by a hydraulic press whose plate base and upper thrust plate will be provided with incandescent electrical resistors.

5. La presión se ejerce sobre dos placas provistas de resistencias incandescentes, una placa inferior que es fija y otra placa superior que es la que hace función de prensado sobre el molde apoyado en la placa inferior, hasta lograr la densidad adecuada, momento en el cual la pieza obtenida es liberada y almacenada.5. The pressure is exerted on two plates provided with incandescent resistors, a lower plate that is fixed and another upper plate that is the function of pressing on the mold supported on the lower plate, until the appropriate density is achieved, at which time which piece obtained is released and stored.

6. La principal característica e innovación es que los plásticos pueden mezclarse sin necesidad de ser lavados, pero sí sometidos a una limpieza en seco a través de una criba de tamiz, donde se desprenden los residuos más pesados, y un sistema de soplado de aire que mediante sacudidas elimina gran parte de las suciedad que acompaña a los plásticos, quedándonos de este modo una cantidad de elementos adheridas a los plásticos que actúan como cargas, es decir como aditivos que da cuerpo y añade fortaleza al producto final actuando como estabilizantes, al mantener las propiedades técnicas, tanto mecánicas como eléctricas y también químicas.6. The main feature and innovation is that plastics can be mixed without being washed, but subject to dry cleaning through a sieve screen, where the heaviest waste is released, and an air blowing system that by shaking removes much of the dirt that accompanies plastics, thus remaining a quantity of elements attached to plastics that act as fillers, that is as additives that gives body and adds strength to the final product acting as stabilizers, to maintain the technical properties, both mechanical and electrical and also chemical.

HOJA DE REEMPLAZO (Regla 2S) REPLACEMENT SHEET (Rule 2S)

Claims

1. A process in which after the reception of the plastic is subjected to screening and cleaning by blowing of dry air, and then going to be crushed, later passes an autoclave in which the plastic is subjected to heat. Once the appropriate temperature is obtained, it passes to a volumetric scale and is poured into a mold into which it is pressed at the same time as it is subjected to heat, by means of incandescent electrical resistors placed on the base plate and the thrust plate of the hydraulic press that Press the plastic introduced into the mold to achieve the necessary density.

2. A process according to claim 1, comprising the following steps: a) Plastics are received and classified according to density. b) The plastic passes to a sieve screen where the heaviest waste is sifted and dry cleaned through an air blower. c) The plastic goes to a grinder mill. d) The crushed plastic is introduced into the autoclave where it is subjected to controlled heat. e) The plastic passes to a volumetric scale, which pours the plastic product inside a mold. f) The plastic that is poured into the mold is subjected to heat and pressure by a hydraulic press whose base plate and upper thrust plate are provided with incandescent electrical resistors that are what provide heat to the plastic poured into the mold. g) The piece is detached from the mold and passes to the storage area.

3. A process according to claim 2, wherein the plastic is dry cleaned by blowing and screening without being previously washed.

4. A process according to claim 2, in which, thanks to the previous phase of screening and blowing, indicated in claim 3, eliminates the risk of contamination by contaminated water discharges.

5. A process according to claim 3, in which, when not being washed, remains of elements adhered to the plastics that act as fillers thereof, giving body and adding strength to the final product acting as stabilizers, while maintaining the technical properties, both mechanical and electrical and also chemical.

REPLACEMENT SHEET (R & gla 25)