JP2002350097A - Rocket firework shell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight rocket firework shell, in which combustibility is excellent, the amount of unburnt core which remains as residue to fall on the ground can be minimized, and bursting charge friendly to the environment is used. SOLUTION: Stars 3 are arranged along the inside surface of the shell skin. The bursting charge 5, which has a core 5a formed of biodegradable plastic-form pieces is filled in the shell. A shell inside-skin 1 of the shell is formed of regenerated card board form, that is, waste paper such as old news paper, corrugated board is pulped, molded in a hemispheric shape, and the inner and outer peripheral surfaces are made smooth by hot-press. The bursting charge 5 is scattered after bursting in the air, but due to the core 5a formed of biodegradable plastic foam, the weight of the firework shell is reduced, and accordingly, the amount of the charge can be reduced in shooting the shell. The plastic foam is very combustible and easily burnt out in scattering, and the amount of residue falling on the ground is also reduced. Even if it falls on the ground, the residue is easy to return to soil. The shell inside skin is a waste-paper molded product, so it is ecologically excellent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireworks ball.

[0002]

2. Description of the Related Art A fireworks ball, generally referred to as a shakubama or split, is made up of a cork and a number of stars arranged along the inside of the cork to produce a fireworks effect. It is mainly composed of four elements: a scavenger filled inside the stars to explode the fireworks, and a fuse drawn out of the outer skin.

[0003] The cork is traditionally made of a hemispherical inner skin formed by laminating old papers such as old newspapers in layers, and a durable paper such as haptron paper or kraft paper stuck thickly on the outer surface of the inner skin. The fireworks ball arranges a large number of stars in which various explosives are formed in the shape of a dumpling on the inner circumference of a pair of hemispherical endothelium,
After filling the inside with a splitting agent, the endothelium is assembled in a spherical shape, and then an outer skin made of kraft paper or the like is thickly attached to the outer periphery of the endothelium to be integrated, thereby completing the process.

[0004] The fireworks ball is put into a launch cylinder and is launched by igniting a fryer in the cylinder. And
At the same time that the ball is fired from the launch cylinder, the flame of the charge ignites the outer end of the squib, keeps the appropriate postponement time until the desired height above the sky is reached, and then ignites the internal charge. The explosion of the bark explodes, and at the same time the stars scatter in a chrysanthemum flower and burn, so that the design of the fireworks is formed in the air in a short time.

[0005] In order to make the fireworks ball as light as possible, the above-mentioned disintegrating agent is formed by drying a blackish gunpowder with water paste around rice husks, cotton seeds, hinoki seeds and the like. Is used. The water paste has good survival and can be dried in a short period of time, and the hardness when assembling a fireworks ball is also moderate. After the development of the fireworks ball, the core of the dispersant burns and scatters.However, since the core is made of natural products such as rice husks and remains as a residue without being burned out, it does not pollute the environment. There is no.

[0006]

By the way, in recent years, it has become difficult to obtain a material used as a nucleus of the above-mentioned remedy, that is, natural products such as rice hulls, cotton seeds, and hinoki seeds. As an alternative, cork grains, also a natural material, have begun to be adopted. Even if the cork particles are used as a core, a disintegrant can be formed to be equal to or lighter than the conventional product, and it can be easily activated with water glue, drying can be done in a short time, the hardness when assembling is moderate, and the environment is No pollution.

However, the cork is slightly inferior in flammability, and therefore, after being developed in the sky at the time of launch,
The amount of falling as residue on the ground without burning out increases,
On a windy day, there was a problem of scattering over a wide area.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce as much as possible the amount of nuclei that are not burned out and fall to the ground as residues without burning out,
Moreover, it is an object of the present invention to provide a fireworks ball using a warp which does not pollute the environment.

[0009]

In order to achieve the above object, a fireworks ball of the present invention has stars arranged along the inside of a bark, and a block of biodegradable plastic foam is placed inside the stars. It is characterized by being filled with a disintegrant whose core is a piece.

[0010] Here, the above-mentioned cork is obtained by pulping waste paper such as old newspaper or corrugated cardboard and forming it into a hemispherical mold and forming it into an inner skin by using a hot press to smooth the inner and outer peripheral surfaces. It is preferred to use

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a procedure for assembling a fireworks ball. In FIG. 1, reference numeral 1 denotes an inner skin of a cork, and the inner skin 1 is prepared as follows. In other words, waste paper such as old newspaper is disintegrated into alkali and pulped, then diluted by adding a binder and the like, and then molded into a hemispherical shaped recycled cardboard molded body using a hemispherical net form by a molding machine. Is done. The recycled cardboard formed by the papermaking is removed by a suction demolding machine and then dried in a dryer. After this,
In order to make the inner and outer peripheral surfaces, which are rough surfaces having fine irregularities due to being formed by the netting form, into smooth spherical surfaces, they are hot-pressed with a heat press having a hemispherical inner and outer form.

As described above, since the endothelium 1 is made of a flexible pulp material formed by molding, there is a possibility that the endothelium 1 will be deformed when the explosive is packed. Therefore, as shown in FIG. 1 (a), this inner skin 1 is previously fitted into a hemispherical assembly jig 2 made of a hard paper press-formed body having the same inner diameter as its outer diameter. As shown in the figure, a large number of stars 3 granulated in a dumpling shape are arranged in an inner periphery thereof. Here, the assembling jig 2 is not limited to a hard paper press molded body, and may be made of wood, resin, or the like. However, from the viewpoint of preventing accidental ignition of explosives, it is desirable to use a non-conductive material for this assembly jig 2, and it is better to avoid metal.

Thereafter, as shown in (c), a partition paper 4 made of newsprint or the like is arranged on the inner periphery of the star 3 and the inside thereof is filled with the splitting agent 5. That is, at the time of assembling to load the star 3 and the prescription drug 5 into the endothelium 1, the endothelium 1 is fitted to an assembling jig 2 made of a non-conductive material having a hemispherical inner surface equal to the outer surface radius thereof. This is performed in a state where the endothelium 1 is reinforced from the outer peripheral side.

[0015] The splitting agent 5 comprises a lump formed of a biodegradable plastic foam decomposable by bacteria and a core 5a.
The black powder 5b is mixed with water paste, applied to a thickness of about 1 to 2 mm, and dried. As a biodegradable plastic foam, for example, polyethylene glycol is dissolved in warm water and mixed with acetyl cellulose, and corn starch and calcium carbonate are mixed with the mixture to make the ratio of acetyl cellulose and starch about 3/7. Further water is added, and the mixture is supplied to a twin-screw extruder, and is extruded by appropriately setting a cylinder temperature, so that the specific gravity is generally 0.0115 to 0.015.
A lightweight and elastic foam of about 0.0150 g / cm ³ can be obtained, and the biodegradable plastic foam thus formed is used as the core 5 a of the splitting agent 5. Here, the shape of the lump serving as the core 5a is desirably non-spherical in order to satisfactorily apply a black explosive.

[0016] As the split medicine, those having different particle sizes according to the size of the fireworks to be prepared are employed. In other words, biodegradable plastic foam lumps used for the core 5a are prepared in various sizes in the range of about 5 to 20 mm, and the preparative agent 5 having a particle size corresponding to the ball size of the fireworks to be produced is manufactured. Is done.

After the work of filling the inner skin 1 with the star 3 and the prescription medicine 5 is completed, as shown in FIG. None, complete filling operation. It is a matter of course that the squib 6, which has been passed through the squib hole 1 a, is drawn into the inner skin 1 in advance to the position of the splitting agent 5.

After that, a tape is wound around the outer periphery of the mating surface of the inner skin 1 and fixed, the jig 2 is removed, and then a strong paper such as kraft paper is laminated and adhered to the outer periphery in multiple layers according to a standard method. As shown in FIG. 2, a firework ball with a thick outer skin 7 integrated with the outer periphery of the endothelium 1 is completed. Note that reference numeral 8 in FIG.
Is a suspension ring projecting from the top of the outer cover 7 for suspending the fireworks with a string.

When the fireworks of the above structure are exploded in the air and developed, the corks comprising the inner skin 1 and the outer skin 7 are shattered and scattered together with the splitting agent. Since the soft inner skin 1 is used for the bark, there is no danger of falling and no obstacle to the design of the fireworks. Also, since recycled paper is basically used, compared with hard paper press molded inner skin Therefore, the raw material cost is low, and it is easy to return to the soil, which is ecologically favorable.

Further, since the biodegradable plastic foam is used for the core 5a of the splitting agent 5, it is equivalent to a conventional rice husk, cottonseed, hinoki, or cork kernel. It becomes lighter than that and is rich in flammability. Therefore, the weight of the fireworks ball can be reduced as much as possible, and the amount of explosive at the time of launch can be reduced. In addition, since the core 5a is highly flammable, it is easily burned out during the scattering, and the amount of the nucleus 5a as a residue on the ground and falling off is reduced as much as possible. further,
Even if the nucleus 5a of the split medicine 5 falls to the ground as a residue, it is easily returned to the soil like a cork and is ecologically preferable because it is made of a biodegradable plastic foam.

On the other hand, since the inner skin 1 is subjected to hot pressing and compression-molded, the inner peripheral surface is not dented and deformed when the explosive is packed, and the inner peripheral surface is formed smoothly. The outer periphery of star 3 is filled with endothelium 1
It is possible to prevent the explosive from peeling off as much as possible even if it is rubbed against the inner peripheral surface. Further, since the outer peripheral surface is formed smoothly, it is excellent in sticking property of haptron paper or the like.

In the above embodiment, only fireworks of so-called split fireworks are described. However, the present invention can be applied to fireworks of non-circular composition called hanging objects (poka balls). Of course.

[0023]

As is clear from the above description, in the fireworks fired by the present invention, after the explosion in the air is developed, the cracking agent is scattered and scattered. Since plastic foam is used, compared to conventional rice husks, cottonseed, hinoki, or cork grains,
It is equivalent or more lightweight, so that the weight of the fireworks can be reduced as much as possible, and the amount of explosive at the time of launch can be reduced. In addition, biodegradable plastic foam is more flammable than rice hulls, cottonseed, hinoki, or cork grains, so it is easily burned out during the scatter after the explosion development, and the amount that falls off as ground residue Can also be reduced as much as possible. In addition, since the core of the remnant of the split medicine that has fallen to the ground is made of a biodegradable plastic foam, it is easy to return to the soil and is ecologically suitable.

Furthermore, a recycled cardboard molded article obtained by pulping used paper such as old newspaper or corrugated cardboard to form a hemispherical mold on the inner skin of the cork and smoothing the inner and outer peripheral surfaces by hot pressing may be used. In addition to being inexpensive and excellent in mass productivity, it can be molded to the same strength as the inner skin obtained by laminating and pasting conventional newspapers, and is crushed into pieces when the splitting agent bursts, resulting in danger of falling and design. Not only can the loss of effect be prevented, but it is also easier to return to the soil, which is better in terms of ecology.

[Brief description of the drawings]

FIGS. 1A to 1D are cross-sectional explanatory views showing a procedure for assembling a fireworks ball according to the present invention.

FIG. 2 is a sectional view showing a completed state of the fireworks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Endothelium (Cork) 2 Assembly jig 3 Star 5 Splitter 5a Nucleus 5b Black powder 7 Outer skin (Cork) 10 Waste paper

Claims (2)

[Claims] 1. A fireworks ball comprising a star arranged along the inside of a cork and filled with a splitting agent whose core is a lump of biodegradable plastic foam inside the star. 2. The method according to claim 1, wherein the corks are made of recycled paper such as old newspaper or corrugated cardboard, formed into a hemispherical mold and formed into a hemisphere, and the inner surface of the recycled cardboard is smoothened by hot pressing. The fireworks ball according to claim 1, wherein