Abstract:
A waste foamed polystyrene material reclaiming method includes the steps of waste material crushing, solvent mixing, filtering, secondary mixing, distilling, evaporated solvent condensing and recycling, reclaimed polystyrene material heating, reclaimed polystyrene material extruding, extruded mass of reclaimed polystyrene material cooling, and grain-cutting.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a method of reclaiming waste foamed polystyrene material. The invention relates also to a system for automatically reclaiming waste foamed polystyrene material. 
     Polystyrene material has been intensively used for making foamed products (dishes, lunchboxes, buffer materials for packing, and etc.) for the advantage of low cost. However, because waste foamed polystyrene material is bulky and not self-decomposable under the weather, it is difficult to properly dispose of waste foamed polystyrene material, and the cost of disposing of waste foamed polystyrene material is high. Further, directly burning waste foamed polystyrene material produces toxic gas. Therefore, there is a strong demand for an economic, efficient waste foamed polystyrene material reclaiming system. 
     SUMMARY OF THE INVENTION 
     The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a waste foamed polystyrene material reclaiming method, which is practical to automatically reclaim waste foamed polystyrene material. It is another object of the present invention to provide a waste foamed polystyrene material reclaiming system, which is practical to automatically reclaim waste foamed polystyrene material. It is another object of the present invention to provide a waste foamed polystyrene material reclaiming system, which is economic, and does not pollute the environment during its operation. According to the present invention, waste foamed polystyrene material is crushed and mixed with a solvent to form a paste-like material. The paste-like material is then distilled into evaporated solvent and reclaimed polystyrene material. The evaporated solvent is then condensed into liquid state solvent for recycling. The reclaimed polystyrene material is then extruded into a mass of reclaimed polystyrene material, and then cold down in a water tank, and then cut into grained-like reclaimed polystyrene material. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a system block diagram showing a waste foamed polystyrene material reclaiming system according to the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A waste foamed polystyrene material reclaiming method in accordance with the present invention comprises the steps of: 
     a. crushing waste foamed polystyrene material; 
     b. adding a solvent to the crushed waste foamed polystyrene material at the ratio of two parts of solvent with one part of crushed waste foamed polystyrene material, and then mixing the solvent and the crushed waste foamed polystyrene material into a paste-like material; 
     c. filtering the paste-like material obtained from step (b) with a filter; 
     d. putting the filtrate thus obtained from step (c) in a container and then heating the filtrate in the container to about 120° C.˜160° C., enabling the filtrate to be separated into reclaimed polystyrene material and evaporated solvent, and then condensing the evaporated solvent into liquid state solvent for recycling and guiding the reclaimed polystyrene material out of the container; 
     e. heating the reclaimed polystyrene material thus obtained from step (d) to about 160° C.˜200° ; 
     f. extruding the reclaimed polystyrene material thus obtained from step (e) into a mass of reclaimed polystyrene material subject to the desired shape and then cooling down the mass of reclaimed polystyrene material; and 
     g. cutting the mass of reclaimed polystyrene material into grained polystyrene material. 
     Referring to FIG. 1, waste foamed polystyrene material is washed and then stored in a storage yard. Well-washed waste foamed polystyrene material is then delivered from the storage yard to a crusher by a conveyer, and then crushed into crushed waste foamed polystyrene material. Crushed waste foamed polystyrene material is than delivered to a first mixer, and at the same time a solvent is pumped from a solvent storage tank to the first mixer for mixing with the crushed waste foamed polystyrene material in the first mixer to form a paste-like material. The solvent is mixed with the crushed waste foamed polystyrene material at the ratio of 2:1. The paste-like material is than delivered from the first mixer to a dissolving material storage tank, and then pumped by a pump from the dissolving material storage tank to a second mixer through a filter. After having been well mixed in the second mixer, the well-mixed filtrate is delivered to a storage tank, and then pumped from the storage tank to a distiller by a pump. The distiller has a return valve connected to the storage tank for enabling overflow filtrate to be returned to the storage tank. The filtrate left in the distiller is distilled and separated into evaporated solvent and reclaimed polystyrene material. The evaporated solvent is then guided from the distiller to a condenser, and then condensed into a liquid state solvent. The liquid state solvent is then collected by a solvent recycling tower, and then delivered to the solvent storage tank. At the same time, waste gas is drawn out of the distiller into the atmosphere by an induced-draft fan. The reclaimed polystyrene material is then extruded into a mass of soft polystyrene material through an extruder, and then directly delivered from the extruder to a water tank for cooling. After cooling, the hardened reclaimed polystyrene material is then cut into grained-like reclaimed polystyrene material and stored in a warehouse. 
     While only one embodiment of the present invention has been shown and described, it will be understood that various modifications and changes could be made thereunto without departing from the spirit and scope of the invention disclosed.