JP2001002081A - Cellular sheet bag suitable for incineration disposal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag formed of cellular plastic sheet suitable for incineration disposal. SOLUTION: There is provided a cellular sheet bag in which two cellular sheets formed of many closed cells by adhering a back sheet to them are adhered to the bottom surfaces of protrusions of a cap film having many protrusions arranged therein. Calcium carbonate is added to one of the sheets and either iron oxide or iron hydroxide is added to the other sheet by 0.1 to 30%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a plastic foam sheet, and provides a plastic foam sheet suitable for disposal by incineration.

[0002]

2. Description of the Related Art A flat back film is adhered to the bottom surface of a projection of a cap film having a large number of projections, which is mainly made of polyolefin plastic as a main material, to form a large number of sealed air bubbles. BACKGROUND ART A plastic foam sheet or a foam sheet in which another flat liner film is bonded to the top of a projection of a cap film (hereinafter, these are collectively abbreviated as "bubble sheet") are used in the field of packaging and the like. Widely used. In particular, a relatively thin material using polyethylene as the main substance is known by the trade name "bubble wrap" and is frequently used as a packaging material, a cushioning material, and a heat insulating material. Thick hard materials using polyethylene and polypropylene as main raw materials are known under the trade name of "Purapearl",
It is widely used as a structural material and a core material.

[0003] This kind of bubble sheet can be reused several times depending on how it is used, but if it becomes dirty or bubbles are crushed, it must be discarded. The fact is that most of the waste is disposed of by incineration because it is bulky. Since plastics as a material of the foam sheet are mainly polyolefins such as polyethylene, those generated by combustion are limited to water and carbon monoxide, and the combustion exhaust gas can be said to be relatively clean. This point is somewhat advantageous when compared to the fact that so-called foamed plastics contain chlorofluorocarbons and hydrocarbons inside the cells, and there is a possibility that undesired components may be generated in the exhaust gas by combustion. In addition, since the content of the bubbles is air, which also assists the combustion of the bubble sheet as a source of oxygen, the bubble sheet is generally good in combustibility, and the incineration process should not be so problematic. .

[0004] However, the actual incineration is performed not only with the foam sheet alone but also with other things such as dust, so that the high flammability of the foam sheet is not always utilized as it is.

On the other hand, as a material of the garbage bag, a polyethylene film mixed with a large amount of calcium carbonate is used. The purpose of the calcium carbonate is to protect the incinerator by suppressing heat generation during incineration.

An important problem with refuse incinerators is that they must be operated under conditions that produce as little poisonous dioxins as possible. There are more than 200 types of compounds collectively referred to as "dioxins", but what can be said in common is that they contain chlorine. In view of the above, in recent years, calcium carbonate has been adsorbing chlorine, which causes dioxin generation, rather than combustion calorie suppression.
The fixed effect was noted.

[0007]

SUMMARY OF THE INVENTION The basic object of the present invention is to provide a plastic foam sheet which is originally rather suitable for incineration, because it has a higher flammability than conventional products and is therefore mixed with dust. It is still another object of the present invention to provide a bubble sheet suitable for incineration, which can be easily incinerated and reduces the generation of dioxins in exhaust gas. A secondary object of the present invention is to provide a bubble sheet in which the cushioning effect of the bubbles is maintained and the above basic effects can be maintained.

[0008]

[Means for Solving the Problems]

As a measure to improve these measures against dioxin, the present inventors have conducted intensive research and have found that by adding an appropriate amount of iron oxide or iron hydroxide powder to calcium carbonate,
It was found that plastic burns at high temperatures and promotes the adsorption and fixing effect of calcium carbonate on chlorine. Therefore, the present inventors have proposed a plastic cap film (1) having a large number of projections as shown in a plan view in FIG. 1 and a cross section in FIG. 2 as a plastic foam sheet bag suitable for incineration treatment. A plastic foam sheet A in which a number of sealed air bubbles (3) are formed by bonding a flat plastic back film (2) to the bottom surface of the projection, or another film is adhered to the top of the air bubbles. A bag (4) obtained by stacking two sheets of B and B and sealing the three sides is proposed.

One of the foam sheets A and B is one in which plastic as a raw material contains 1 to 60% of calcium carbonate, and the other one contains 0.1 to 30% of iron oxide or iron hydroxide. Become. Here, iron oxide or iron hydroxide refers to Fe ₂ O ₃ (hematite), Fe
₃ O ₄ (magnetite), FeO (OH), (goethite), Fe (OH) ₂ (iron hydroxide), and Fe ₂ SO ₄ , which promote the combustion of plastic by the oxidation-reduction reaction, It has the effect of burning high calories. By adding an appropriate amount of iron oxide or iron hydroxide powder, the chemical reaction proceeds under high temperature conditions due to the catalytic action of iron oxide or iron hydroxide, so that the reaction efficiency of the chlorine adsorption and fixation effect of calcium carbonate increases. According to the inventor's intensive studies, the ratio of calcium carbonate to iron oxide or iron hydroxide varies depending on the particle size, but is preferably 20: 1 to 300: 1, and more preferably 50: 1 to 150. : 1 is more desirable.

These bubble sheets A and B do not need to be the same size as shown in FIG. A or B
Either of them may have a larger dimension, so-called "bag with tongue".

It is not necessary to add calcium carbonate or iron oxide to each of the two or three layers of the foam sheets A and B. It is sufficient that at least one of the two or three layers contains calcium carbonate, iron oxide or iron hydroxide.

[0013]

[Function] A plastic bubble mainly composed of a polyolefin-based plastic and formed by bonding a flat back film to the bottom surface of a projection of a cap film having a large number of projections to form a large number of sealed air bubbles. Sheet,
Alternatively, a bubble sheet in which another flat liner film is bonded to the top of the projection of the cap film (hereinafter, these are collectively abbreviated as "bubble sheet") is widely used in the field of packaging and the like. I have. This kind of bubble sheet has good flammability, and its incineration treatment should not be a problem. However, since the actual incineration is not performed by using the foam sheet alone, but is often performed in a state of being combined with other things such as dust, the high flammability of the foam sheet is not always utilized. The basic object of the present invention is to provide a plastic foam sheet, which is originally rather suitable for incineration, which has a higher flammability than conventional products, and therefore can be easily incinerated even when mixed with dust and the like. An object of the present invention is to provide a foam sheet suitable for incineration treatment, in which the generation of dioxins in the inside is reduced. A secondary object of the present invention is to provide a bubble sheet in which the cushioning effect of the bubbles is maintained and the above-described basic effects can be maintained. As a measure to improve these measures against dioxins, the inventors of the present invention have conducted intensive studies, and by adding an appropriate amount of iron oxide powder to calcium carbonate, plastics burn at a high temperature and the chlorine adsorption and fixing effect of calcium carbonate is promoted. Turned out to be. Therefore, the present inventors bonded a flat plastic back film to the bottom surface of a plastic cap film provided with a large number of protrusions as a plastic bubble sheet bag suitable for incineration treatment, thereby forming a large number of sealed air bubbles. Two plastic foam sheets A and B each formed or having another film adhered to the top of the foam are
We propose a three-sided sealed bag.

[0014]

EXAMPLE A foam sheet A made of polyethylene was prepared by kneading 30% of calcium carbonate in a back film, and a foam sheet B was Fe ₂ O ₃ (hematite).
A bag kneaded with 0.3% was used, and both were stacked and sealed on three sides to obtain a bag. At this time, the weight of both the foam sheets A and B was 80 g per square meter.

[0015]

The bubble sheet bag of the present invention suppresses the generation of dioxin by adsorbing and fixing chlorine gas originally generated from refuse which is burned at the same time as burning as a post-treatment.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a bag of the plastic foam sheet of the present invention.

FIG. 2 is a sectional view taken along the line II of FIG. 1;

[Explanation of symbols]

 1 Cap film 2 Back film 3 Bubbles 4 Bubble sheet bag

Claims (1)

[Claims] 1. A plastic bubble sheet formed by bonding a flat plastic back film to the bottom surface of a projection of a plastic cap film provided with a large number of projections to form a number of closed air bubbles, or One more flat film is attached to the top of the bubble in the bubble sheet, and two more bubble sheets are stacked and sealed on three sides. One of the bags is made of 1-60% calcium carbonate in the plastic material. A bag characterized by being a plastic foam sheet containing 0.1 to 30% iron oxide or iron hydroxide.