KR20010025436A - A shot for light fire arms - Google Patents

Abstract

PURPOSE: A bullet for a fire extinguisher is provided to improve a power characteristic, a destruction characteristic and a flying characteristic appropriate for a use purpose and to increase a hit rate without using lead in a bullet core material and improving an ammunition box, a propellant and a detonator. CONSTITUTION: A bullet core material is comprised of an elastomer for improving the resilience of a bullet core in a thermoplastic polymer resin; a thermoplastic resin composition(3) added up with a plasticizer; heavy metals(4,5) having small and large powder particles to adjust the gravity of the bullet core; a biodegradable additive for naturally dissolving a polymer resin; and a bonding agent for improving the interfacial adhesiveness between the thermoplastic resin composition and the heavy metal. The bullet core material is formed into a specific shape of the bullet core.

Description

Bullet for fire extinguisher {A SHOT FOR LIGHT FIRE ARMS}

The present invention relates to bullets for fire extinguishers, such as pistols, rifles, machine guns, and more particularly, to non-toxic fire extinguisher bullets without using lead as a core material.

The performance of bullets was mainly evaluated by accuracy and power characteristics. Until recently, bullets with high accuracy and strong power were required. However, in recent years, in addition to this, non-toxicity or a power characteristic suitable for the purpose that does not adversely affect the environment or animals is also required. Among these, the power characteristic may require strong power and weak power depending on the purpose. In particular, the purpose of weak power is to prevent damage to objects and aircraft such as buildings and airplanes, or to cause more damage to the target during terrorism, rioting or hijacking.

Conventional bullets, except for special shells such as iron shells or mineral bullets, lead is used as the bullet core (1) of the ordinary bullet shown in FIG. 1, and the surroundings are made of a warhead shell (2) of cylindrical metal such as copper and copper alloy. I put it on and make a bullet. This lead is toxic and has the disadvantage of adversely affecting the environment and the animal, such as deterioration of water quality and lead poisoning when the animal drinks it. Moreover, the invention disclosed in Unexamined-Japanese-Patent No. 7-503528 is known as improvement of this fault, for example.

The invention of Japanese Patent Application Laid-open No. Hei 7-503528 is a compression mixture of thermoplastic resins selected from the group consisting of fine copper powder, nylon 11 and nylon 12 in the material of the bullet. And the copper powder is at least 92 mass%, and the minimum specific gravity of a compressed mixture is set to 5.7.

Among the bullets described in the prior art, bullets using lead in the bullet core 1 have a high toxicity as described above and adversely affect the environment and animals, while having a proper specific gravity, and thus high accuracy. There is this. This hit accuracy is particularly excellent in the case of ordinary bullets, since the bullet core is covered with a warhead shell (2) such as copper alloy, the bullet is rotated according to the spiral when firing through the barrel of the spiral. Can hit correctly.

However, the power characteristics of ordinary bullets are excellent in strong power because the specific gravity of lead (tan core (1)) is 11.3, but it is a drawback when weak power is required. In addition, since the core 1 is made of only lead, there is a problem in that power characteristics of specific gravity suitable for the purpose cannot be obtained.

Subsequently, according to the invention of Japanese Patent Application Laid-Open No. 7-503528, since the thermoplastic resin is composed of nylon 11 and nylon 12, it is excellent in corrosion resistance but difficult to decompose in environmental problems, and thus itself in recent years. It is a factor that causes pollution. In addition, the problem of destroying the environment or wasting resources has been raised in the point that recycling (recycling) and small-reduction (reduction of sources) are important.

In addition, since the heavy metal of the present invention is a mixture of copper powder having a particle diameter of 11 µm or less, 22 µm or less and 44 µm or less, the total area of the heavy metal increases, the frictional resistance increases, and the kneading resistance increases. There is a problem that it becomes dust during work and is easy to scatter and deteriorates working environment and increases manufacturing cost. In addition, the type of heavy metals to be mixed is only copper powder, so that the specific gravity of the bullet is increased to increase the power, or the specific gravity may be reduced to decrease the power characteristic.

The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a fire extinguisher bullet having a non-toxic, high accuracy, and a power characteristic suitable for the purpose of use without improving the powder container, the propellant, the primer, and the like. To provide.

In order to achieve the above object, the fire extinguisher bullet of the invention according to claim 1 is a fire extinguisher bullet which combines a bullet core and a warhead shell of a cylindrical metal covering the core, wherein the bullet core increases the elasticity of the bullet core in a thermoplastic polymer resin. A carbon core material is formed from a thermoplastic resin composition to which an elastomer and a plasticizer are added, a heavy metal in the form of powder particles to control the specific gravity of the carbon core, and a binder for improving interfacial adhesion between the thermoplastic resin composition and the intermediate speed. In addition, this core material is formed into a predetermined core of the core.

According to the invention of claim 1, the thermoplastic resin composition of the carbon core material is obtained by adding a plasticizer to the thermoplastic polymer resin, whereby the fluidity in the molding processing temperature range is improved. For this reason, a thermoplastic resin composition can be sent to the surface periphery of the powdered heavy metal. Moreover, since the deformation | transformation does not occur during storage of a bullet with excellent corrosion resistance, it acts more easily to decompose than nylon 11, nylon 12, etc. in an environment. In addition, the thermoplastic resin composition is added with an elastomer exhibiting rubber elasticity at room temperature, thereby enhancing rubber elasticity to the bullet core, and when the carbon core is bonded into the warhead shell of the cylindrical metal, the surface layer portion of the bullet core is easily adhered to the inner surface of the warhead skin. I can do it.

In addition, since heavy metals in the form of powder particles are mixed, by adding or subtracting the mixing ratio, the power characteristics of the bullet can be adjusted by increasing the specific gravity of the carbon core to increase the strength, or decreasing the specific gravity to weaken the power. In addition, by forming heavy metals into powder particles, the carbon core material can be dispersed evenly in finely shaped portions or corners of the core core when forming the core core of a predetermined shape, and at the same time, molding processing such as injection molding can be performed. It can be done easily.

In addition, since the binder is added when mixing the thermoplastic resin composition and the heavy metal, the affinity of the thermoplastic resin composition is improved by covering the particle surface of the heavy metal to improve the interfacial adhesion between the molecules of the thermoplastic resin composition and the particle surface of the heavy metal. do. Therefore, even if the thermoplastic resin composition is elastically deformed, the thermoplastic resin composition can be prevented from peeling off from the surface of the heavy metal.

The thermoplastic resin composition of the invention according to claim 2 is a biodegradable additive for naturally decomposing the polymer resin.

According to the invention according to claim 2, since the biodegradable additives which naturally decompose the polymer resin are added to the thermoplastic resin composition, the biodegradable additives are melted and cooled to interconnect the heavy metals in the form of powder particles. The heavy metal in powder particle form can be put in the inside. For this reason, even a heavy metal having a high melting point can be injection molded through a biodegradable additive, thereby easily forming a core. In addition, the biodegradable additive does not decompose the polymer resin during daily use, and even if the polymer resin is left in the ground or in water, it is decomposed by microorganisms and the like to form a low molecular compound. Finally, it is considered to be carbon dioxide or water, and it is a non-toxic substance that does not adversely affect the environment or animals.

The heavy metal of the invention according to claim 3 is a mixture of a heavy metal which is a small diameter powder particle having a powder particle diameter of 1 to 3 mu m and a heavy metal which is a powder particle having a large diameter of 30 to 150 mu m.

According to the invention of claim 3, since the heavy metal is a mixture of a metal having a small powder particle diameter and a heavy metal having a large powder particle diameter, the kneading resistance is increased, and the heavy metal forms a bridge, and the screw of a molding machine or the like is easily broken. To prevent peeling with the thermoplastic resin composition, and the like. That is, in the case of only heavy metals having small powder particle diameters, the total area of the heavy metals increases and the kneading resistance is increased. In the case of heavy metal having a large powder particle diameter, bridges are easily formed in a molding machine or the like during kneading, and since the screw is easily broken and the total area of the heavy metal is narrowed, peeling with the thermoplastic resin composition is likely to occur. As in the present invention, by mixing a heavy metal having a small powder particle diameter and a heavy metal having a large powder particle diameter, both defects can be fixed.

The material of the heavy metal of the invention according to claim 4 is one of tungsten, stainless steel, iron, copper, aluminum, or a mixture thereof.

According to the invention of claim 4, the material of the heavy metal is any one selected from tungsten, stainless steel, iron, copper, aluminum, or a mixture thereof, so that the specific gravity of the core can be selected from small to large as needed. That is, by adding or subtracting the respective mixing ratios, the specific gravity of the core can be increased to make a strong power, or the specific gravity can be made to be a weak power to adjust the power characteristics suitable for the purpose.

The carbon core material of the invention according to claim 5 is made of powdered glass instead of powdered heavy metal.

According to the invention of claim 5, since the carbon core material is a mixture of a thermoplastic resin composition and powdered glass, the specific gravity is small, so that the core core shared by the bullet of weak power characteristics can be easily formed.

Moreover, the said heavy metal is mixed with the said glass of this invention of Claim 6.

According to the invention according to claim 6, since the carbon core material is a mixture of a thermoplastic resin composition, a powdered particle heavy metal and glass, the specific gravity of the core can be adjusted extensively, and the specific gravity is increased to make a strong power or increase the specific gravity. When making small and weak power, the power characteristic can be finely adjusted by adding or subtracting the mixing ratio of heavy metal with high specific gravity and glass with low specific gravity.

Moreover, specific gravity of the core after after being formed in the said specific shape of invention of Claim 7 is set to 2-13.5.

According to the invention according to claim 7, since the specific gravity of the bullet core after being formed into a specific shape is 2 to 13.5, the bullet core of a bullet having a weak power characteristic having a small specific gravity or the bullet core having a strong power characteristic having a large specific gravity or these A bullet core having a medium power characteristic can be selectively formed according to the intended use.

The thermoplastic resin composition of the invention according to claim 8 is a thermoplastic resin composition in which a plasticizer is added to an elastomer instead of a thermoplastic resin composition in which an elastomer and a plasticizer are added to a thermoplastic polymer resin.

According to the invention according to claim 8, since the thermoplastic resin composition is a composition in which a plasticizer is added to the elastomer, the elasticity can be further increased than the core core containing the polymer resin in the thermoplastic resin composition.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the bullet which comprises the lead core and the shell of a lead concerning a prior art, and is a partial longitudinal cross-sectional view.

2 is an explanatory view of a bullet composed of a bullet core and a warhead shell of a bullet core material according to the present invention, and is a partial longitudinal cross-sectional view thereof.

3 is an explanatory view of a carbon core with an elastomer and a carbon core without an elastic polymer in the carbon core material according to the present invention, and a graph showing the results of the compression test;

4 is an explanatory diagram showing a method for obtaining accuracy of hit.

<Description of the code | symbol about the principal part of drawing>

1: bullet core 2: bullet shell

3: thermoplastic resin composition 4: heavy metal with large powder particle diameter

5: heavy metal with small particle diameter

Embodiments of the present invention will be described next with reference to the drawings and tables.

2 is a partial longitudinal cross-sectional view of a bullet for a fire extinguisher constituting a bullet core and a warhead shell of the bullet core material according to the present invention. As shown in Fig. 2, a bullet core material is formed of a thermoplastic resin composition (3), a heavy metal (4, 5) having large / small powder particles of diameter, a binder, and an additive according to the purpose of use described later. Then, the core material is formed into a specific shape of core and is bonded to the warhead shell 2 as shown in the figure, and then mounted in a gun barrel (not shown).

The thermoplastic resin composition 3 of the carbon core material is obtained by adding an elastomer and a plasticizer to the thermoplastic polymer resin, and the thermoplastic polymer resin is polypropylene (PP), polyethylene (PE), polyurethane (PU), polystyrene ( PS) etc. may be mixed. Moreover, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or a polyether resin may be sufficient. In addition, the iono resins used for coating the golf ball surface instead of polyethylene may be used. Nylon 6 (6PA) is also available.

The following elastomers exhibit rubber elasticity at room temperature, and natural rubber or synthetic rubber, or any combination thereof, can enhance elasticity and toughness of the core. In particular, when the elastic core has a low elasticity, the surface layer is hardly bonded to the inner surface of the warhead shell 2 when the elastic core is press-fitted and bonded to the shell metal shell 2 of the cylindrical metal. It is an indispensable additive because the core is destroyed by the indentation load as described later.

The plasticizer is intended to facilitate the molding process by improving the flow characteristics in the molding process temperature range of the polymer resin. Specifically, phthalic acid, such as dioctyl phthalate (DOP) and dibutyl phthalate (DBP), contains plasticizers of esters, internal delimiting agents such as ethylene bis stearamide, and the like. This plasticizer improves the flow characteristics at the time of forming the core core material with the core core to facilitate molding processing.

In addition, polyester plasticizers, plasticizers of phosphate esters such as tricredyl phosphate (TCP) and triphenyl phosphate (TPP), fatty acid esters such as epoxidized soybean oil and methylacetyl cynorate (MAR) are also included. will be. The compounding quantity makes dioctyl phthalate (DOP) into 13 mass% or less with respect to the gross mass of the thermoplastic resin composition 3, for example.

Next, a biodegradable additive added to the thermoplastic resin composition 3 of the carbon core material will be described. This biodegradable additive is an additive for natural decomposition of the polymer resin. Specifically, the biodegradable additive is made from microorganisms such as poly-3-hydroxy butyrate, bio polyester, ga-dran, furan, bacterium cellulose and poly amino acid. Biodegradable additives made from natural additives such as additives, starch, chitin, chitosan, polysaccharides produced by the sea, cellulose, aliphatic polyesters, polyurethane resins, polyamide resins, polyvinyl alcohols, polyesters, etc. Biodegradable additives made synthetically and the like are preferred.

In this example, polypropylene (PP) and starch-based biodegradable and water-soluble biodegradable additives were mixed and used in a ratio of 80 to 20 by mass ratio. Then, these biodegradable additives are mixed with the polymer resin so that the polymer resin is not decomposed during daily use, and when the bullet is left in the soil or in water, the carbon core thermoplastic resin composition (3) itself mixed by the microorganism or the like is finally obtained. It can be decomposed into water, carbon dioxide, biomass (microbial group) and the like.

Next, the heavy metal / glass of powder particle shape for adjusting specific gravity of a carbon core is demonstrated. The powdered heavy metal / glass is a specific gravity adjusting material mixed with the carbon core material to produce bullets having low specific gravity or high specific gravity.

In this description, heavy metals include tungsten (W: 19.3), stainless steel (SUS: 7.7), iron (Fe: 7.87), copper (Cu: 8.96), and particularly aluminum (Al: 2.69). Shall be. In addition, any of heavy metals including these alloys, or a selective combination thereof, is mixed into the core material. On the other hand, for glass (GP: specific gravity 2.5), only glass or mixed with the heavy metal is mixed into a carbon core material.

Among these non-composition materials (heavy metal / glass), the most suitable heavy metal for forming a carbon core material in a high specific gravity region is tungsten, which does not adversely affect the surrounding environment even when left in the air, and has a specific gravity of lead greater than 11.3. Since it has a specific gravity of 19.3, it is most suitable for creating a high specific gravity region within a limited volume of the core. In addition, when forming in a low specific gravity region, glass is most suitable, and aluminum is also preferable. In addition, by combining each of the above materials or these, it is possible to selectively form a carbon core material suitable for the purpose of use from the low specific gravity region to the high specific gravity region.

Next, adjustment of specific gravity using the above-mentioned carbon core material is demonstrated. The polymer resin of the thermoplastic resin composition (3) is made of polypropylene (PP) or nylon 6 (6PA), and mixed with each other by mixing heavy metals in the form of powder particles, glass (GP) in the form of powders, elastomers, and the like. Table 1 shows an example of the distribution at the time of adjusting the ratio and manufacturing the carbon core material having different specific gravity. Elastomers and synthetic rubbers were also added.

Basic composition table of various specific gravity cores (mass%) importance Test sign PP GPA GP Al SUS Cu W Elastomer Sum Tansim 2 2A 3.1 82.0 14.9 100 2 5.0 78.0 17.0 100 4 4A 1.8 8.0 81.6 8.6 100 4 2.0 14.0 75.4 8.6 100 8 8A 1.0 2.9 91.1 5.0 100 8 1.0 93.0 6.0 100 11.3 11 3.5 96.5 100 11.3 11A 1.0 96.5 2.5 100 11.3 11B 96.5 3.5 100 13.5 13A 0.4 97.8 1.8 100

As shown in Table 1, it is possible to arbitrarily adjust a wide range in which the specific gravity of the core is 2/4/8 / 11.3 / 13.5. If the gravity of the bullet is less than 2, the bullet is too light to fire through the barrel of the spiral, so the initial velocity of the bullet is too fast to obtain rotation along the spiral. The accuracy of the hit cannot be obtained. On the contrary, when the specific gravity of the core is 13.5 or more, there is a limit on the amount of the medicine in the gunpowder, so that the initial speed is lowered, and as a result, a predetermined high power cannot be obtained.

When the core material of each specific gravity adjusted as described above was molded into a predetermined shape of the core core and press-fitted into the warhead shell 2, it could not be pressurized if the brittleness was high, so the compressive strength of the core core was tested. The test core material was made of two kinds of test code 11 not containing the elastomer shown in Table 1, test code 11A containing 2.5% by mass of the elastomer, and lead cores used in conventional bullets. The compressive strength test was performed by applying a compressive load to the cylindrical body of the core at right angles to the axis and evaluating the percentage change in the outer diameter when the outer diameter at no load was 100. The test results are shown in Table 2. In addition, what was graphed for easy viewing is shown in FIG.

9mm pistol: bullet core compression test results (% change in outer diameter) Compression Load (N) 0 100 200 300 400 500 600 700 800 900 1000 Test sign Lead 100 100 99 99 98 97 97 95 94 92 89 11 100 100 100 100 100 98 96 86 Destruction 11A 100 100 99 99 98 97 96 95 93 91 89

As a result, as shown in Table 2 and FIG. 3, the test core 11 without mixing the elastomer was not deformed up to 400 N, and then deformed significantly as the load increased, and was broken between 700 and 800 N. . In addition, in the bonding test in which the bullet core was press-fitted into the warhead shell 2, a part of the bullet core was dropped and was not suitable for the bullet core supplied to the bullet.

The carbon core mixed with 2.5 mass% of the elastomer of test code 11A is not deformed up to 100N, and then gradually deforms as the load increases, deforming to 98% at 400N, 96% at 600N, 93% at 800N, and 89% at 1000N. Will it be? There was no destruction until this stage. This test value was generally the same as the lead core, and there was no problem in the bonding test in which the core was pressed into the warhead shell (2).

In addition, the heavy metals 4 and 5 have a low kneading resistance with the thermoplastic resin composition 3, and heavy metals 4 having a large powder particle diameter and heavy metals 5 having a small powder particle diameter so as not to damage the screw of a molding machine or the like. Two kinds of and are mixed. The heavy metal (5) having a small powder particle diameter has a powder particle diameter in a range of 1 to 3 µm, and a heavy metal (4) having a large powder particle diameter having a range of 30 to 70 wt% based on the total mass of the heavy metal. Silver powder whose particle diameter is 30-150 micrometers exists in the range of 30-70 mass% with respect to the gross mass of heavy metal. Further, the powder particle diameter of the heavy metal 4 having a large powder particle diameter is more preferably in the range of 100 to 150 µm in order to suppress kneading resistance. Moreover, in order to suppress the flow mark of the molded article, the addition mass of the heavy metal 4 with large powder particle diameter becomes like this. More preferably, it is the range of 55-70 mass%.

Next, the reason for numerical limitation of the powder particle diameter of the heavy metal 5 with small powder particle diameter is demonstrated. If the powder particle diameter of the heavy metal 5 having a small powder particle diameter among the heavy metals is smaller than 1 µm, when forming the carbon core, the surface area of the heavy metal 5 having a small powder particle diameter increases to increase the frictional resistance and kneading resistance. Is higher. In addition, since the powder particles have a small powder shape, they are easily dusted and scattered during operation, and the working environment is deteriorated and the manufacturing cost increases. If the powder particle diameter of the heavy metal 5 having a small powder particle diameter among the heavy metals is larger than 3 µm, it is easy to form a ridge inside the extruder, and the screw is easily broken. Therefore, the powder particle diameter of the heavy metal 5 having a small powder particle diameter is preferably 1 to 3 m.

When the heavy metal (5) having a small powder particle diameter is less than 30 mass% with respect to the total mass of the heavy metal, the effect of adding the heavy metal (5) having a small powder particle diameter is less, and the heavy metal (4) having a relatively large powder particle diameter is reduced. The proportion is increased to easily form a ridge in the molding machine, which is likely to break the screw of the extruder. In addition, the total surface area of the heavy metal is reduced, so that peeling occurs between the heavy metal and the thermoplastic resin composition, so that cracks or lack of strength tend to occur in the molded article (ballistic core). If the heavy metal 5 having a small powder particle diameter exceeds 70 mass% with respect to the total mass of the heavy metal, the total surface area of the heavy metal becomes too large and the frictional resistance is increased, thereby increasing the kneading resistance when forming the core. Therefore, the heavy metal 5 with small powder particle diameter is 30-70 mass% with respect to the gross mass of heavy metal.

Next, the reason for numerical limitation of the particle size distribution of the heavy metal 4 with large powder particle diameter is demonstrated. When the powder particle diameter of the heavy metal 4 with large powder particle diameter is smaller than 30 micrometers, the effect of adding the heavy metal 4 with large powder particle diameter becomes small, and kneading resistance becomes large at the time of extruding a carbon core material. When the powder particle diameter of the heavy metal 4 with a large powder particle diameter among heavy metals is larger than 150 micrometers, a bridging is formed in the inside of an extruder at the time of extrusion, and the screw inside an extruder is easy to be damaged. In addition, peeling easily occurs between the surface of the heavy metal 4 having a large powder particle diameter and the thermoplastic resin composition 3, and cracking and lack of strength occur in the molded core.

In addition, since the powder particle diameter is large, it is locally segregated to form a material of the same quality, and the quality of the material is degraded. When heavy metal 4 having a large powder particle diameter appears on the surface of the core, the unevenness of the surface of the core increases, resulting in an uneven surface, resulting in poor adhesion to the inner surface of the warhead shell 2. Therefore, the powder particle diameter of the heavy metal 4 with large powder particle diameter shall be 30-150 micrometers.

When the heavy metal 4 having a large powder particle diameter is less than 30 mass% with respect to the total mass of the heavy metal, the effect of the heavy metal 4 having a large powder particle diameter added is small, and the kneading resistance is increased during extrusion. If the heavy metal 4 having a large powder particle diameter exceeds 70 mass with respect to the total mass of the heavy metal, it is easy to damage the screw inside the extruder by forming a ridge inside the extruder when extruding. In addition, peeling easily occurs between the surface of the heavy metal 4 having a large powder particle diameter and the thermoplastic resin composition 3. In addition, peeling easily occurs between the surface of the heavy metal 4 having a large powder particle diameter and the thermoplastic resin composition 3, so that a crack or a lack of strength occurs in the molded article (core core), so that the core core cannot be rolled onto the warhead shell (2). do. Therefore, the heavy metal 4 with large powder particle diameter shall be 30-70 mass% with respect to the gross mass of heavy metal.

Next, a binder for improving the interfacial adhesion between the thermoplastic resin composition and the heavy metal will be described. This binder is a kind of surfactant (surfactant) which is added when kneading a thermoplastic resin composition containing an elastomer and a heavy metal, and has affinity for a group and a metal having affinity for a resin in one molecule. It has both sides of Mars.

For this reason, interfacial adhesiveness can be improved and peeling of a thermoplastic resin composition and a heavy metal and crack of a molded article (ballistic core) can be prevented. As this binder, the titanium-based binder was dissolved in n-propyl alcohol to be in the range of 0.2 to 1.0 mass% based on the total mass of the heavy metal. In addition to the titanium binder, a silane binder or an aluminum binder may be used.

An example of the manufacturing procedure of the carbon core material which consists of such a compound is demonstrated. First, biodegradable additives having both polypropylene (PP) and starch-based biodegradable and water-soluble properties are mixed at a ratio of 80 to 20 by mass. And the plasticizer which consists of dioctyl phthalate (DOP) was added to this mixture, and it mixed by the powder mixer.

Next, the polypropylene (PP) was added to the extruder, in which an additive mixed with an elastomer, a biodegradable additive, and a plasticizer, heated, melted, extruded, and cut to have a diameter of 0.5 mm and a length of about 0.5 to 1.0 mm. The cylindrical pellet was formed in a generally cylindrical shape.

Next, in the process separate from the above-described resin pellets, for example, the heavy metal (4) having a large powder particle diameter of tungsten and the heavy metal (5) having a small molecular particle diameter are mixed at an appropriately selected ratio, and the surface of the heavy metal and Titanium-based binders for improving interfacial adhesion with the polymer resin molecules are mixed. Specifically, the titanium-based binder is dissolved by stirring and mixing for about 1 hour at a temperature of 50 ° as n-propyl alcohol and added to the resin pellet. Next, the binder added to this heavy metal was dried in a drying furnace.

Next, a mixture of this binder and heavy metal and a resin pellet formed by adding an elastomer, a biodegradable additive and a plasticizer to the polymer resin are mixed with a powder mixer. Next, a mixture of resin pellets and heavy metals is put into an extruder. The resin pellets and heavy metals put into this extrusion are heated and extruded into a cooling chamber equipped with a cold air conditioner without being cut at the extrusion hole by a screw inside the extruder.

This cold air system cools a thermoplastic resin composition containing heavy metals extruded in a molten state from an extrusion port. The thermoplastic resin composition containing the heavy metal cooled by the cold wind device is cut by a pelletizer having a hot cutter cut by a rotary blade to form a pellet. The thermoplastic resin composition containing the heavy metal cut into the pellets is pelletized in the state of being welded by heat, and is put into a grinder to form pellets having a shape.

Next, a pellet-like thermoplastic resin composition is collected in a crusher and then put into a damper to be stirred. Through these steps, a carbon core material of a thermoplastic resin composition containing pellet-shaped heavy metal is produced.

The thermoplastic resin composition of the present embodiment thus prepared is mixed with a biodegradable polymer resin and a heavy metal mixed with tungsten having a large and small powder particle diameter, so that the polymer resin is melted inside the extruder and then cooled. In this way, the polymer resin acts as a binder for binding heavy metals having large and small powder particle diameters to fill heavy metals having large and small powder particle diameters inside the thermoplastic resin composition.

In addition, since a biodegradable thermoplastic resin composition and a tungsten heavy metal are used, they are decomposed by microorganisms and the like even when left in the natural environment, and do not adversely affect the natural environment. Tungsten is nontoxic such as lead and does not pollute the environment. Moreover, since the plasticizer is added to the polymer resin, the fluidity of the polymer resin can be improved. This makes it possible to improve the contact state between the polymer resin and the metal surface of the heavy metal at the time of heat kneading the polymer resin with the heavy metal having a large and small powder particle diameter.

That is, the thermoplastic resin composition having good fluidity can be sent around the surface of the heavy metal having large and small powder particle diameters without any gap, so that the gap between them can be suppressed and the two can be firmly adhered. In addition, since the binder is added to the resin pellets formed by using the plastic material in the polymer resin, the surface of the heavy metal is coated to increase affinity with the thermoplastic resin composition, and the peeling of the interface is suppressed.

Next, in order to manufacture the core core, a thermoplastic resin composition containing the pellet-shaped heavy metal is injected into an injection molding machine, which is another extruder, and injection molded into a plurality of arrayed core cores, thereby forming a predetermined core core. As shown in FIG. 2, the molded core core is in a state in which a heavy metal is filled in the thermoplastic resin composition 3 containing an elastomer. The heavy metal filled in the thermoplastic resin composition 3 can uniformly disperse the heavy metal 4 having a large powder particle diameter and the heavy metal 5 having a small powder particle diameter uniformly in the thermoplastic resin composition 3. .

The bullet core thus formed is press-fitted from the opening of the warhead shell 2 formed in a cylindrical shape with copper or copper alloy to be in close contact with each other, and the opening is folded and folded to form the bullet shown in FIG. 2.

The 9 mm pistol bullet thus formed was tested. The specific gravity of the core is 2/4/8 / 11.3 / 13.5, and the polypropylene (PP), stainless steel (SUS), tungsten (W), powder granular glass (GP), and elastomer are selected. And mixed with an additive containing a binder, n-propyl alcohol and dioctyl phthalate (plasticizer) as appropriate. These mixing ratios are as follows, and also shown in Table 3. However, additives other than specific gravity adjusting material (heavy metal), polymer resin, and elastomer are mixing ratios.

(1) Mixing ratio (unit: mass%) which forms the core of specific gravity 2 (2A)

◇ Specific gravity adjusting substance GP 82.0

◇ Polymer resin PP 3.1

◇ Elastomer (synthetic rubber) 14.9

◇ Additives ‥‥ binder GP × 1

n-propyl alcohol (solution) GP × 10

(2) Mixing ratio to make up specific gravity 4 (4A) (unit: mass%)

◇ Specific gravity adjusting substance GP 8.0

SUS 81.6

◇ Polymer resin PP 1.8

◇ Elastomer (synthetic rubber) 8.6

◇ Additives ‥‥ Binder GP, SUS × 1

n-propyl alcohol (solution) GP, SUS × 10

(3) Mixing ratio to create a core of specific gravity 8 (8A) (unit: mass%)

◇ Specific gravity adjusting substance GP 2.9

W 91.1

◇ Polymer resin PP 1.0

◇ Elastomer (Synthetic Rubber) 5.0

◇ Additives ‥‥ binder GP, W × 0.35

n-propyl alcohol (solution) GP, W × 5

Dioctyl phthalate (plasticizer) PP, elastomer × 3

(4) Mixing ratio to create a core of specific gravity 11.3 (11A) (unit: mass%)

◇ Specific gravity adjusting material W 96.5

◇ Polymer resin PP 1.0

◇ Elastomer (Synthetic Rubber) 2.5

◇ Additives ‥‥ Binder W × 0.35

n-propyl alcohol (solution) W × 5

Dioctyl phthalate (plasticizer) PP, elastomer × 12.5

(5) Mixing ratio (unit: mass%) to form a core of specific gravity 11.3 (11B)

◇ Specific gravity adjusting material W 96.5

◇ Elastomer (Synthetic Rubber) 3.5

◇ Additives ‥‥ Binder W × 0.35

n-propyl alcohol (solution) W × 5

Dioctyl phthalate (plasticizer) elastomer × 12.5

(6) Mixing ratio to create a core of specific gravity 13.5 (13A) (unit: mass%)

◇ Non-adjustable substance W 97.8

◇ Elastomer (Synthetic Rubber) 1.8

◇ Polymer resin PP 0.4

◇ Additives ‥‥ Binder W × 0.35

n-propyl alcohol (solution) W × 5

Dioctyl phthalate (plasticizer) PP, elastomer × 12.5

Pistol bullets: an overview of the bullets used in the shooting performance evaluation test importance Test sign Main composition (mass%) Additive composition (mass%) PP GP SUS W Elastomer Binder n-propyl alcohol Dioctyl phthalate 2 2A 3.1 82.0 - - 14.9 One 10 - 4 4A 1.8 8.0 8.6 - 8.6 One 10 - 8 8A 1.0 2.9 - 91.1 5.0 0.35 5 3 11.3 11A 1.0 - - 96.5 2.5 0.35 5 12.5 11B - - - 96.5 3.5 0.35 5 12.5 13.5 13A 0.4 - - 97.8 1.8 0.35 5 12.5

In addition, each participant of Table 3 is a mixing ratio, and the standard of each mixing ratio is as follows. That is, the binder, n-propyl alcohol, is% by mass relative to the specific gravity adjusting material. Dioctyl phthalate (DOP) has a specific gravity of 8 (test 8A), 11.3 (test 11A), and 13.5 (test 13A) for polypropylene (PP) and elastomers in mass%, 11.3 (test 11B). In mass% relative to polypropylene (PP).

The actual shots were fired at the bullets using these specific gravity 2/4/8 / 11.3 / 13.5. The results of the actual fire test are shown in Table 4.

9mm pistol: shooting performance evaluation test results Weight ratio Test sign Bullet mass (g) Launch amount (g) Speed (m / s) Accuracy (25m) (mm) Emergency 2 2A 2.8 0.20 366 17 Good 0.28 504 24 Good 4 4A 3.9 0.20 341 16 Good 0.28 471 21 Good 8 8A 6.2 0.20 296 14 Good 0.28 405 19 Good 11.3 11A 8.1 0.28 351 17 Good 11B 8.1 0.28 352 22 Good 13.5 13A 9.4 0.28 332 23 Good

In addition, the firing doses were 0.20g and 0.28g for the test codes 2A, 4A, and 8A, and test codes 11A, 11B, and 13A were used for one type of 0.28g. Accuracy is the average value of the average radius of 10 shots x 3 enemies of 1 shot group. The method of calculating the accuracy of the hit is at the target position at 25 m from the muzzle, as shown in FIG. It calculated | required and evaluated by MR value. The lower the MR value, the higher the accuracy. The accuracy of the pistol can be used with an MR of 30 mm or less. The emergency was determined by the total scarring of the target site. Goodness was made to penetrate into a normal posture.

The specific gravity of the bullet core is good in accuracy and non-compliance for all the bullets of 2/4/8 / 11.3 / 13.5, and it can cope with practical use without any inferiority with the conventional bullets made of lead. In addition, the actual shooting result of test code 11B (specific gravity 11.3 of the core), which does not contain polypropylene (PP) of the polymer resin and mainly contains tungsten (W) and elastomer, is good. It can also be provided practically enough.

Since it is as above-mentioned, this invention has the following effects.

According to the invention of claim 1, the polymer resin is excellent in corrosion resistance and does not deteriorate even after long-term storage of the bullet using the bullet core according to the present invention. In addition, by mixing heavy metals, a bullet core material can be formed with a specific gravity or a small specific gravity equal to that of a conventional lead core using lead, and thus, a bullet having a power characteristic or a low power characteristic equivalent to a bullet using lead can be selectively configured. And since the bullet according to the present invention does not use lead, there is an effect that is non-toxic and does not adversely affect the environment or animals. In addition, since the elastomer is added to the thermoplastic resin composition, the surface layer portion of the bullet core is familiar with the inner surface of the warhead shell when the bullet core is bonded to the warhead shell of the cylindrical metal, thereby obtaining a highly adhesive bullet.

In addition, according to the invention of claim 2, since the biodegradable additive naturally decomposes the thermoplastic resin composition, even if the fired bullet is left in the ground or in water, there is an effect that it is decomposed by microorganisms and the like to contaminate the environment.

In addition, according to the invention of claim 3, the heavy metal is mixed with a heavy metal having a powder particle diameter of 1 to 3 µm and a heavy metal having a large powder particle diameter of 30 to 150 µm to lower the kneading resistance, thereby screwing a screw such as a molding machine. And damage to the thermoplastic resin composition can be prevented, thereby improving productivity. Moreover, since the powder particle diameter of the heavy metal with small powder particle diameter was set to 1-3 micrometers, dust can be prevented from scattering during operation | work, and work environment improvement and manufacturing cost can be aimed at. In addition, since the particle diameter of the heavy metal having a large powder particle diameter is set to 30 to 150 µm, there is no cracking or lack of strength of the core and the surface of the core can be formed smoothly. Therefore, the adhesion between the warhead skin and the core of the cylindrical metal is high. Bullets can be obtained.

In addition, according to the invention of claim 4, the material of the heavy metal can be appropriately selected and blended with various heavy metals such as tungsten, stainless steel, iron, copper, or aluminum, so that the specific gravity is adjusted by adjusting the specific gravity to suit the purpose. It is possible to manufacture a wide range of bullets.

In addition, according to the invention of claim 5, since the carbon core material is a mixture of a thermoplastic resin composition, powdered heavy metal and glass, it is possible to easily produce a bullet having low specific gravity with low specific gravity.

In addition, according to the invention of claim 6, since the carbon core material is a mixture of a thermoplastic resin composition and powdered heavy metal and glass, a bullet suitable for a wide range of power characteristics can be obtained by adjusting the specific gravity by adding or subtracting the mixing ratio of heavy metal with high specific gravity and glass with low specific gravity. It can manufacture.

In addition, according to the invention of claim 7, the specific gravity of the bullet core after being formed into a predetermined shape is set to 2 to 13.5. Therefore, the low specific gravity bullet having a low specific gravity, the high specific gravity bullet having a high specific gravity, or a bullet having an intermediate power characteristic thereof is used. This can be produced in a wide range.

According to the invention of claim 8, since the thermoplastic resin composition is a composition in which a plasticizer is added to the elastomer, the elasticity can be further increased than the cores containing the polymer resin in the thermoplastic resin composition.

Claims (8)

In the bullet for the fire extinguisher which combines a bullet core and the warhead shell of the cylindrical metal which coats this shell core, The carbon core is a thermoplastic resin composition in which an elastomer and a plasticizer are added to a thermoplastic polymer resin to increase elasticity of the core, a powdered heavy metal for adjusting the specific gravity of the carbon core, and the thermoplastic resin composition and the heavy metal A fire extinguisher bullet, characterized in that a carbon core material is formed as a binder for improving interfacial adhesion, and the carbon core material is formed into a specific core. The fire extinguisher bullet according to claim 1, wherein a biodegradable additive for naturally decomposing the polymer resin is added to the thermoplastic resin composition. The fire extinguisher bullet according to claim 1, wherein the heavy metal comprises a heavy metal having a powder particle diameter of 1 to 3 µm and a heavy metal having a diameter of 30 to 150 µm. The fire extinguisher bullet according to claim 1, wherein the heavy metal is made of tungsten, stainless steel, copper, iron, aluminum, or a mixture thereof. The fire extinguisher bullet according to claim 1, wherein said bullet core is made of powder particles of glass instead of heavy metals of powder particles. 6. The fire extinguisher bullet according to claim 5, wherein the glass is mixed with the heavy metal. The fire extinguisher bullet according to claim 1, wherein the bullet core is formed in a specific shape so that its specific gravity is 2 to 13.5. The fire extinguisher bullet according to claim 1, wherein the thermoplastic resin composition is a thermoplastic resin composition in which a plasticizer is added to the elastomer instead of the thermoplastic resin composition in which the elastomer and the plasticizer are added to the thermoplastic polymer resin.