JP3063426U - Plastic film bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add to a raw material a substance which is removed by combining with a harmful substance generated when a bag manufactured using a plastic film as a raw material is incinerated. SOLUTION: The bag 1 is manufactured using a plastic film 2 as a raw material. A slaked lime-based composite was added to the raw material made of the plastic film 2 and combined with harmful substances generated when incinerated together with general garbage to be removed. . The slaked lime-based composite was used as a purified coal ash.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bag manufactured using a plastic film as a raw material, and more particularly to a bag in which a substance that removes harmful substances generated when incinerated is added to the raw material.

[0002]

[Prior art]

 Conventionally, bags manufactured from plastic films such as polypropylene and vinyl as raw materials have been routinely used in large quantities as shopping bags and garbage bags. It is known that when these bags are incinerated, hydrogen chloride gas is generated, and highly toxic dioxin is generated.

[0003] Dioxins (organochlorine compounds), which are highly toxic from incinerators, have serious effects on humans, animals and plants, and soil pollution. It is said that in Japan, where the incineration rate of garbage is high and there are many small incinerators, the amount of dioxin generated is much higher than in other countries. Although incinerator exhaust gas regulations have only recently been tightened, the treatment of incinerated ash and fly ash, which contain most dioxins, is left untouched and requires permanent measures as soon as possible. ing. Dioxin is generated in incinerators mainly by hydrogen chloride gas generated from municipal waste.

According to the 1997 Ministry of International Trade and Industry survey data, urban household waste was 32.95 million tons, industrial waste was 240.12 million tons, and the total waste was about seven times the amount of household waste. there were. About 4.15 million tons of plastic waste are discharged annually, and the amount of household waste is about 320 tons, accounting for about 10% of total household waste, and 950,000 tons of industrial waste. . The total plastic production in the same year was about 6 million tons, and about 70% of the production was wasted.

[0005]

[Problem to be solved by the invention] The treatment of plastic waste has both difficult and easy aspects as a treatment method due to the properties of plastic. Plastics are all major obstacles to landfill and incineration methods commonly used in waste disposal. In landfills, plastics remain in the soil for long periods without degradation, destabilizing the soil properties in the area. In addition, harmful substances (stabilizers, pigments, etc.) contained in plastics may be dissolved and cause secondary pollution. While it is very difficult to find landfills for general garbage, landfills for plastic waste are more severely restricted and landfilling is virtually impossible.

When incinerating plastics, the plastics cause a high temperature state when burning, and not only damage the incinerator, but also PU, PVC, etc. after burning, such as hydrogen chloride, cyan, SO _x , NO _x, etc. It promotes the generation of harmful gases, making incineration more difficult. Even if plastic waste is incinerated, resources cannot be used effectively.

The present invention has been made in view of the above circumstances, and strongly removes toxic gas generated when a plastic film bag is burned together with general refuse in an incinerator, and at the same time, causes acid rain. It is an object of the present invention to provide a plastic film bag that reduces acidic gases such as SO _x and NO _x , prevents deterioration of incinerator walls due to a decrease in the amount of acidic substances and calorie, prevents dioxins, and protects the global environment.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides: A bag manufactured using a plastic film as a raw material is characterized in that a slaked lime-based composite is added to the raw material made of the plastic film and combined with harmful substances generated when incinerated to be removed.

B. It is characterized in that the slaked lime-based composite is a purified coal ash.

[0010]

[Action]

 With the above configuration, the plastic film bag of the present invention performs the following operations.

The above A. With this configuration, the toxic gas generated when a plastic film bag is burned together with general waste in an incinerator is removed by combining with the slaked lime-based composite added to the raw material of the plastic film. As a result, emissions of hydrogen chloride gas to be generated factor dioxin greatly reduced, a cause of acid rain SO _x, also the discharge of acid gases such as NO _x decreases, also reduces the amount of combustion heat In addition, the deterioration of incinerator walls is prevented along with the reduction of acid gas. In addition, the residue of heavy metal residues after combustion will be eliminated, and pollution due to secondary pollution will be prevented.

In the above B. With this configuration, the refined coal ash, a slaked lime-based composite added to the raw materials for plastic films, can be manufactured at low cost artificially from coal ash generated in large quantities from thermal power plants. It is easily available, inexpensive, and easily added to plastic film raw materials.

[0013]

[Embodiment of the invention]

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a plastic film bag used for shopping bags and garbage bags, and the bag 1 is made of a polyethylene film 2. The polyethylene film 2 contains 2-7% by weight of purified ash (also called artificial zeolite), a slaked lime-based compound, in refuse solid fuel (RDF), and 15 to 15% by weight of the raw material. 20% (hereinafter abbreviated as HDPE). This refined coal ash is produced artificially by subjecting a large amount of coal ash discharged from a thermal power plant to a special refining process at a scientific plant, and is relatively inexpensive and easy to handle.

The refined coal ash has a multi-porous surface, and the pores combine with harmful substances (gas) generated when the general refuse is incinerated together with the polyethylene film 2 to be fixed and removed. Has performance. Other slaked lime composites may be used in place of the purified coal ash. The characteristics of the refined coal ash are as follows.

[0015]. Reacts and adsorbs efficiently with hydrogen chloride generated in the incinerator and becomes calcium chloride and others. Ca (OH) ₂ + 2HCl → CaCl ₂ + 2H ₂ O. Since this reaction is not a physical adsorption but a scientific reaction, hydrogen chloride is firmly captured and not released. . The generated calcium chloride and the like do not decompose even at high temperatures in an incinerator. . Slaked lime remaining as ash after incineration is harmless. Calcium hydroxide can be used as a soil conditioner, and calcium chloride can be used as a snow melting agent and food additive. . The refined coal ash does not contain heavy metals and reduces the amount of heat during combustion.

As a result of a test on the hydrogen chloride removal property of the purified coal ash, it was found that 100 g of the purified coal ash removed about 80 g of hydrogen chloride when the PVC material was burned in an electric furnace. From this result, in the case of garbage bags, assuming that 50 g per bag, 3 kg of garbage and 0.4% of chlorine source in municipal garbage, the amount of hydrogen chloride generated is 12 g at the raw material addition rate of purified coal ash of 15%. 5.9 g was removed, and the hydrogen chloride removal rate was 49%. At a raw coal ash refined product addition rate of 30%, 11.8 g of the hydrogen chloride generation amount of 12 g was removed, and the hydrogen chloride removal rate became 98%. Therefore, it is desirable that the raw material addition rate of the refined coal ash in the garbage bag is about 30%.

Further, assuming that the LL size bag in the shopping bag is 15 g, the garbage content is 500 kg, and the chlorine source in the municipal garbage is 0.4%, the amount of hydrogen chloride generated is 10% for the refined coal ash raw material addition rate. 1.2 g of 2 g was removed, and the hydrogen chloride removal rate became 60%. At a raw coal ash refined product addition rate of 15%, 1.8 g of the hydrogen chloride generated amount of 2 g was removed, and the hydrogen chloride removal rate became 90%. Therefore, it is desirable that the raw material addition rate of the purified coal ash in the shopping bag is about 15 to 20%.

The film properties of the 24 μm thick HDPE are as follows.・ Tensile strength and elongation: Almost no change as compared with those without the refined coal ash.・ Heat seal strength: 1 kgf or more, which is equivalent to that without adding purified coal ash. -Printability: No peeling was observed by cellophane tape or paper tape peeling test. -Color tone and transparency: The color tone is beautiful milky white, and the transparency is such that the contents are visible. -The product form is available in the form of a high-temperature masterbatch and can be used in film sheets or injection molding.

The security of HDPE is as follows. -It can be used safely and with peace of mind. -Molded products show weak alkalinity when water is interposed.・ Alkalinity is not a problem.・ Skin irritation is not a problem.

Hardness: Mohs' hardness is 2-3, and there is no abrasion of processed metal parts like general inorganic fillers. -Specific gravity: Lighter than general inorganic fillers. -Burned calories: The garbage bags showed the same or slightly lower burned calories as the calcium carbonate added garbage bags. -Antibacterial property: It has strong antibacterial property and has an effect of preventing garbage in garbage bags.・ An antibacterial effect is observed in Escherichia coli at 15% or more and Staphylococcus aureus at 20% or more.

It has basicity, and can be used for an acidic neutralized sheet and the like. The result of analyzing the components of a fixed amount of the purified coal ash is as follows: C = 5.3%, O = 4.5%, Mg = 0.5%, Al = 21.8%, Si = 5 4.5 %, K = 1.2%, Ca = 9.0%, Ti = 0.7%, Fe = 2.5%, and heavy metals (Pb, Cd, Ba, Cr, Sb, As, Se, etc.) It is not contained at all, and no heavy metals remain after burning in an incinerator, and it does not cause pollution due to secondary pollution.

[0022]

[Effect of the invention]

 As described above, the plastic film bag of the present invention has the above-described configuration, and can exert the following operation and effects.

[0023] A slaked lime-based composite was added to the raw material consisting of plastic film, which was combined with harmful substances generated when incinerating garbage to remove it.The plastic film bag was burned together with general garbage in the incinerator. The harmful substances generated at this time are removed by combining with the slaked lime-based composite added to the raw material of the plastic film. As a result, it is possible to significantly reduce the emission of hydrogen chloride, which is a cause of dioxin generation, and to reduce the emission of acid gases such as SO _x and NO _{x that} cause acid rain. In addition, by reducing the amount of combustion heat, it is possible to prevent the deterioration of the incinerator wall as well as the reduction of the acid gas. Furthermore, residual heavy metal residue after combustion can be eliminated, and pollution due to secondary pollution can be prevented.

[0024] Since the slaked lime-based composite was used as a refined coal ash, the slaked lime-based composite that was added to the raw material of the plastic film was produced artificially from coal ash generated in large quantities from thermal power plants. It can be purified at low cost, is easily available, is inexpensive, and is easy to add to plastic film raw materials.

[Brief description of the drawings]

FIG. 1 is a perspective view of a plastic film bag according to the present invention.

[Explanation of symbols]

 1 plastic film bag 2 polyethylene film

Claims (2)

[Utility model registration claims] 1. A bag manufactured using a plastic film as a raw material, wherein a slaked lime-based composite is added to the raw material made of the plastic film and combined with a harmful substance generated when incinerated to be removed. Characteristic plastic film bag. 2. A plastic film bag according to claim 1, wherein said slaked lime composite is a purified coal ash.