JP3112295B2 - Molding method of split rubble stone for construction from plastic waste products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a cracking stone for construction, which is used to recycle a plastic-based waste material mainly composed of a high-molecular compound, which is a thermoplastic synthetic resin material.

[0002]

2. Description of the Related Art Disposal of plastic-based used products made from high-molecular compounds in household municipal garbage or industrial waste has conventionally been incinerated, but harmful gas (hydrogen chloride) generated during combustion has been used. ) Caused a pollution problem, which is currently being replaced by landfills in forests and other wilderness areas. However, since it does not corrode, it has spilled to the surface of the ground and has caused damage such as land subsidence. ing. Therefore, many means have been proposed for reusing plastic waste without incineration and landfill disposal. (Patent Publication Nos. 62-231709 and 63
No.-11309, same as No.2-241705 and others. )

[0003] However, these waste containers have a large volume porosity and require a large-sized apparatus, and in many cases, hydrogen chloride gas is generated by heating and the incinerator is corroded and burned by high heat. On the other hand, removal of impurities such as metals, glass, and fibers and accessories and a sorting device are required, processing costs are high, and the profitability of recycling is impaired. is there.

[0004]

The problem to be solved by the present invention is to reduce the above-mentioned volume ratio (void) as a method of recycling used waste products of synthetic resin products. (B) To minimize the generation of harmful gases such as hydrogen chloride. (C) As a means to suppress processing costs, the three issues of removing accessories and reducing the sorting step in the molding process should be solved. In addition, the plastic resin material is recycled by utilizing the property that it does not corrode underground. Processing is an object of the present invention.

[0005]

As means for solving the above-mentioned problems, mainly, used waste products of thermoplastic synthetic resin are compressed by known means without selecting the kind of synthetic resin and accessories such as metal pieces. Pulverization or heat shrinkage at a constant temperature, and then sand and gravel having a volume ratio of 20 to 70% are mixed with stirring and further heated and melted, and the mass diameter is 25 mm to 40 mm.
The present invention relates to a process for forming a split quarry stone for construction, which is extruded into a ballast lump having a length of 30 mm to 50 mm.

[0006]

[EXAMPLE] The used waste material of the thermoplastic synthetic resin product is used as the material of the present invention. However, fixing devices such as screws and screws attached to the waste product and accessories such as metal and textile products are not used. Is not performed. In addition, molded products made of thermoplastic resin materials generally have large volume ratios (voids).
Since it requires means such as pulverization, there are many methods to heat and stretch the resin waste material after heating and stretching the sheet, and long-sized vinyl chloride resin (PVC) and polyethylene (PE) acrylic resin molded products. Has a memory phenomenon (memory effect) that shrinks when heated again.
It is appropriately adjusted within the temperature of 0 ° C. and heat-shrinks to reduce the volume to 1/4 to 1/6 of the original volume. Then, sand and gravel 2 are mixed and mixed into the synthetic resin material 1 whose volume has been reduced by heat in a heating furnace or the like at a volume ratio of 20 to 70% of the volume-reduced material, introduced into a heating furnace or a mold, and further heated and melted.

When the temperature exceeds 250 ° C., the amount of hydrogen chloride gas increases rapidly, and a large amount is generated by combustion. Therefore, the temperature is adjusted by heat management within about 500 ° C. below the combustion temperature, and the diameter after cooling is 20 mm to 40 mm. It is extruded into a ballast lump having a length of 30 mm to 50 mm, or is molded using another molding die. As the forming means, press-fitting, vacuum heating, degassing and other processing means may be used in combination. The shape may be polygonal, cylindrical, or unequal, and the material is a structure made of thermoplastic resin 1, sand, gravel 2, metal pieces, fibers, and other mixed materials 3.

[0008] For processed ballast material, specific gravity 2.0-
4.5, water absorption (%) 5, compressive strength kg / mm ² 100
Mold within the range of ~ 500. As the reinforcing material, an inorganic or organic reinforcing material, a filler, and a lubricant may be appropriately added and molded.

[0009]

[Effect] The present invention is to provide a split quarry stone for construction using the plastic waste by the above-mentioned molding method, and the molding process is a labor-saving process and a molding process by a batch processing process without separating and sorting accessories and the like. Therefore, it is effective for labor saving of the process. Further, the mixed material 2 such as metal and fiber has an effect of effectively acting on the solidification property and strength of the product. In addition, since the thermoplastic synthetic resin material is mainly reused, the material cost can be supplied at a low price, so that a processed product can be provided at a low cost. Further, during processing, there is an advantage that generation of a large amount of harmful gas by combustion can be suppressed, so that there is no concern about environmental pollution and resources can be reused. Further, the ballast material is formed into a ballast material having a specific gravity similar to that of a stone material, and has a hardness, compressive strength and the like which can be compared with that of split stone, and is a processed product having durability as a material buried underground.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a molding process according to the present invention.

FIG. 2 is a perspective view of a processed product showing an embodiment of the split stone of the present invention.

[Explanation of symbols]

 1 Synthetic resin material 2 Sand or gravel 3 Mixed materials such as metal pieces

Claims (1)

(57) [Claims] 1. For used waste products mainly made of thermoplastic vinyl chloride resin, polyethylene resin, and acrylic resin, without separating and sorting fixtures such as screws and screws, accessories such as metal pieces and fibers in the waste products, All of the used waste is heated in a heating furnace at a temperature of 120 ° C. to 500 ° C. to be shrunk by heating to 1/4 to 1/6 of the original volume, and then reduced to the heat shrunk volume reducing material. Sand and gravel are mixed at a volume ratio of 20% to 70% of the material, and the mixture is stirred and melted in a heating furnace, and has a specific gravity of the same level as stone, 2.0 to 4.5, a water absorption of 5%, and a compressive strength of 100 to 100%. Diameter 20-40 within the range of 500 kg / mm ²
A method for forming a split rubble stone for construction by using a plastic waste product, which is extruded into a ballast block having a length of 30 to 50 mm.