JPH05878A - Ignition powder - Google Patents

Abstract

PURPOSE:To provide the ignition powder which can simultaneously fire projectile powder without using such special ignition powder as the ignition powder which is installed in the bottom of the projectile powder, and without delay in ignition and can eventually eliminate the excessive residual powder. CONSTITUTION:Combustible fibers of nitrocellulose and kraft pulp are suspended in water to prepare a slurry and, further, a stabilizer and binder are added to this slurry. The slurry is molded to a cylindrical shape by vacuum suction to obtain the felt-like ignition powder 1. The ignition powder is coated with a combustible protective pipe and is installed in the central part of the projectile powder, by which the projectile powder which does not require the special ignition powder, such as bottom ignition powder, is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition charge for a propellant charge for a gun such as a Riyu shell.

[0002]

2. Description of the Related Art A propellant charge used in a gun such as a Riyuu ammunition can be ignited simultaneously with the propellant charge forming the charge, that is, a curve showing a pressure chamber pressure for one hour shows a smooth yambushi. Realization is required. The reason is that if simultaneous ignition cannot be achieved, the conversion rate of the chemical energy of the propellant to the bullet kinetic energy will not be maximized, and the ignition state will differ delicately at each shot, which will cause a decrease in range accuracy. Not only that, but depending on the case, a large gas pressure difference is generated over the entire length of the propellant, which may damage the shell bottom and the barrel.

In the propellant charge system currently in use, several to ten and several dozen kilograms of propellant must be simultaneously ignited with a flame emitted from a fire tube weighing only one to two grams. In order to achieve this, several cloth bags called gun sacks are piled up with a medicine pack filled with propellant, and a bag filled with ignition charge (bottom ignition charge) is sewn at the bottom of the charge. And in general, the bottom package is made of propellant with good ignition. With this kind of device, it is possible to achieve simultaneous ignition of the propellant. Separately from this, a propellant charge has been put into practical use, in which the igniter charge attached to the bottom of the medicine package is connected to a protective tube accommodating the igniter charge at the center of a bundle of elongated strands in the direction of the width axis.

[0004]

However, as long as such a charging system is used, the user always prepares a complete propellant charge, and removes unnecessary medicine packages according to the shooting distance to the target. I was forced to adjust the amount of gunpowder and fire,
The discarded medicine package can no longer be used. This means that unused medicine packages impose an economic burden as a result of preparation costs and disposal costs. An object of the present invention is to provide an igniting charge that does not generate a residual charge and enables simultaneous firing of the propellant without delaying ignition without using a special igniting charge installed at the bottom of the propelling charge. It is to be.

[0005]

The solution to this problem is achieved by an ignition charge based on combustible fibers of nitrocellulose and kraft pulp. By arranging such a tubular ignition charge with its axis on the central axis of the propellant charge, the simultaneous ignition performance of the gun is significantly improved. The present invention is an ignition charge which is composed of a combustible fiber of kraft pulp with nitrocellulose as a main component and is formed into a tubular shape.

The nitrocellulose used in the present invention has a nitrogen content of 12.6%, which is generally used for smokeless gunpowder.
The above is preferable, and the pulp used in the present invention is
It is preferable to use kraft pulp produced by the sulfite method or the prehydrolyzed sulfate method. The composition weight ratio of nitrocellulose and kraft pulp constituting the ignition charge (1) of the present invention is preferably 60 to 90% by weight of nitrocellulose and 10 to 40% by weight of pulp. If the amount of nitrocellulose is less than 60% by weight, the explosive power as an igniter and the heat of explosion are reduced, which is not preferable.

According to the present invention, the igniter is a tubular molded body whose main components are nitrocellulose and kraft pulp combustible fibrous material, has a felt-like finish, and is extremely excellent in ignitability. No firing process is possible.
Since the ignition charge (1) is configured in a tubular shape, when the ignition charge (6) is arranged on the central axis of the charge (6) and used (see FIG. 2), the flame emitted from the fire tube passes through the ignition charge cylinder. Then, since the ignition charge is uniformly ignited over the entire length of the propellant charge, the simultaneous ignition property of the propellant charge (4) is improved. As a result, not only is a reproducible firing process achievable, but it also eliminates the need for bottom igniter like conventional charges.

The inner diameter (d) of the ignition charge (1) needs to be set so that the flame emitted from the fire tube spreads over the entire length of the charge, and the inner diameter (d) is 5 mm to 50 mm.
Is preferable, and more preferably 10 mm to 35 mm. If this inner diameter (d) is too large, the flame of the fire tube does not reach the entire length of the charge. On the contrary, if it is too small, it impedes the progress of the flame, preventing simultaneous ignition of the propellant and creating a large differential pressure in the chamber. Cause

The thickness of the cylinder wall of the ignition charge (1) needs to be set to the minimum thickness for igniting the propellant charge, and the thickness is preferably 2 to 30 mm, more preferably 5 to 1 mm.
It is 5 mm. If the thickness is less than 2 mm, the amount of ignition charge for igniting the propellant cannot be secured, and conversely, if the thickness is 30 mm or more, the amount of ignition charge becomes unnecessarily large. It is not preferable because it causes a differential pressure due to ignition shock or the like.

Also, the ignition charge (1) is provided with a flammable protective tube (2).
By storing it in, it is possible to prevent damage from shock and vibration due to transportation and handling. The stabilizer of the central ignition agent (1) can ignite, for example, ethyl centrallite, diphenylamine, etc. for the purpose of suppressing the spontaneous decomposition of nitrocellulose, and further as a binder, for example, polystyrene-butadiene latex or Polyvinyl acetate or the like can be used.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Based on the embodiments shown in the accompanying drawings,
The present invention will be described in detail.

[0012]

Example 1 Nitrocellulose having a composition weight ratio of 70 parts (nitrogen content of 12.6%) and 15 parts of combustible fibers of kraft pulp were suspended in water to form a slurry, and 2 parts of a stabilizer were further added. 13 as ethyl central and binder
Part of polystyrene-butadiene latex was added, and the mixture was molded into a cylinder by vacuum suction and dried to manufacture a cylindrical ignition charge (1). The density of the ignition charge is about 0.2 g / cm ³
It was a cylinder of felt-like material.

[0013]

Example 2 A flammable protective tube (2) made of nitrocellulose (nitrogen content 12.6% by weight) and kraft pulp.
In Fig. 2, the central ignition powder (1) produced in Example 1 was placed in the inside of the container by using an adhesive, and the central ignition powder (1) was placed in the center of the medicine package filled with the propellant (4) in a flammable container. The propellant charge shown was manufactured.

In the propellant charge shown in FIG. 2, the flame emitted from the fire tube (5) travels over the entire length of the ignition charge (1) installed at the center of the propellant charge, and is filled in a flammable container. The medicine (4) was ignited all at once.

[0015]

[Example 3] In order to simulate the process of firing the propellant charge in a gun chamber, a transparent acrylic simulator (6) simulating the gun chamber was used to carry out the second embodiment.
The firing test of the propellant charge prepared in 1. was conducted. At that time, the initial combustion behavior in the chemical chamber, which was taken using high-speed video, shows that the flame emitted from the fire tube (5) spreads over the entire length of the central ignition powder (1) in the cylinder, and is uniformly distributed to the propellant powder (4). We were able to confirm that they were all ignited. A curve showing the pressure in the drug chamber-elapsed time measured at the same time is shown in FIG. FIG. 3 shows that the propellant charge (4) is ignited without ignition delay.

[0016]

As described above, the ignition charge of the present invention enables simultaneous ignition of the propellant without delaying the ignition without having to prepare the ignition charge at the bottom of the propellant charge. is there. By using the tubular ignition charge of the present invention, it is possible to shoot without ejecting the unnecessary package which has been generated in the conventional propellant charge having the bottom ignition charge.

[Brief description of drawings]

FIG. 1 is an overall view of a central ignition charge of the present invention.

FIG. 2 shows an overall view of a propellant charge with a central ignition charge.

FIG. 3 is a curve showing a pressure in a chamber of a propellant charge provided with a central ignition charge of the present invention-elapsed time.

[Explanation of symbols]

1 ignition charge 2 protection tube d inner diameter 4 propellant 5 fire tubes

Claims (2)

[Claims] 1. An igniting charge which is composed of a combustible fiber of pulp with nitrocellulose as a main component and is formed into a tubular shape. 2. The ignition charge according to claim 1, wherein the inner diameter of the cylinder is 5 mm to 50 mm.