COMBUSTIBLE PROPELLANT CHARGE SLEEVE

Abstract

A combustible propellant charge sleeve for ammunition which can be fired from an armor barrel includes pulp, nitrocellulose, MO.sub.3 particles, wherein M=Mo and/or W, and cationic surfactant, wherein the average particle size d.sub.50 of the MO.sub.3 particles is 0.5-2.0 m, the maximum particle size d.sub.100 of the MO.sub.3 particles is 20 m, and the quotient of the average MO.sub.3 concentration in % by weight in a volume element of about 0.05 to 1.0 cm.sup.3 (C.sub.VE) at any point in the propellant charge sleeve and the total MO.sub.3 concentration in % by weight (C.sub.total) in the propellant charge sleeve is C.sub.VE:C.sub.total =0.80-1.20.

Claims

1. A combustible propellant charge sleeve for ammunition which can be fired from an armor barrel, comprising; pulp; nitrocellulose; 5-10% by weight of MO.sub.3 particles, based on the total weight of the propellant charge sleeve, wherein M=Mo and/or W; and 0.01-2% by weight of cationic surfactant, based on the total weight of the propellant charge sleeve; wherein the average particle size d.sub.50 of the MO.sub.3 particles is 0.5-2.0 m, the maximum particle size d.sub.100 of the MO.sub.3 particles is 20 m, and the quotient of the average MO.sub.3 concentration in % by weight in a volume element of about 0.05 to 1.0 cm.sup.3 (C.sub.VE) at any point in the propellant charge sleeve and the total MO.sub.3 concentration in % by weight (C.sub.total) in the propellant charge sleeve is C.sub.VE:C.sub.total=0.80-1.20.

2. The combustible propellant charge sleeve according to claim 1, wherein the average particle size d.sub.50 of the MO.sub.3 particles is 0.8-1.4 m.

3. The combustible propellant charge sleeve according to claim 1 wherein the d.sub.100 value of the MO.sub.3 particles is 12 m.

4. The combustible propellant charge sleeve according to claim 1, wherein the propellant charge sleeve contains 7-8% by weight of MO.sub.3 particles and/or 0.05-1% by weight of cationic surfactant.

5. The combustible propellant charge sleeve according to claim 1, wherein C.sub.VE:C.sub.total=0.85-1.15.

6. The combustible propellant charge sleeve according to claim 1, wherein the volume element has a size of about 0.5 cm0.5 cm0.2 cm to 1.5 cm1.5 cm0.4 cm, wherein the propellant charge sleeve has a wall thickness, the 0.2 cm to 0.4 cm being the wall thickness of the propellant charge sleeve and C.sub.VE:C.sub.total=0.90-1.10.

7. The combustible propellant charge sleeve according to claim 1, wherein the quotient of the average MO.sub.3 concentration in % by weight in a volume element of about 0.33 cm.sup.3 (C.sub.VE) at any point in the propellant charge sleeve and the total MO.sub.3 concentration in % by weight (C.sub.total) in the propellant charge sleeve is C.sub.VE:C.sub.total=0.80-1.20

8. The combustible propellant charge sleeve according to claim 1, wherein M=W.

9. The combustible propellant charge sleeve according to claim 1, wherein the cationic surfactant contains two or more cationic groups.

10. The combustible propellant charge sleeve according to claim 1, wherein the cationic surfactant is a salt of an organic polyamine and/or polyethyleneimine with an acid.

11. A method of manufacturing a combustible propellant charge sleeve according to claim 1, comprising the steps of: (a) preparing a slurry of the pulp, the nitrocellulose, and the MO.sub.3 particles, wherein M=Mo and/or W, and cationic surfactant in water; (b) mixing the slurry; (c) dewatering the slurry on a sieve mold to prepare a raw felt; (d) pressing the raw felt; and (e) drying to form a combustible propellant charge sleeve.

12. The method according to claim 11, wherein the slurry in step (a) contains 5-10% by weight of MO.sub.3 particles, based on the total weight of the pulp, nitrocellulose, MO.sub.3 particles and cationic surfactant, and/or 0.1-2% by weight of cationic surfactant, based on the total weight of the pulp, nitrocellulose, MO.sub.3 particles and cationic surfactant.

13. The method according to claim 11, wherein the cationic surfactant contains two or more cationic groups, and wherein the cationic surfactant comprises a salt of an organic polyamine with an acid.

14. The method according to claim 11, wherein a stabilizer is additionally added in step a), and wherein the stabilizer includes acardite.

15. A method of using of a combustible propellant charge sleeve according to claim 1 for firing ammunition, wherein the ammunition includes artillery ammunition.

Description

EXAMPLE 1

[0054] Preparation of Combustible Sleeves for Tank Gun Ammunition

[0055] Pulp sheets are beaten in water (2627 liters of process water) to form a fiber mash. This takes place in a container with a rotating knife at the bottom. Weigh-in weight 78.8 kg. The fiber mash is then ground in a refiner. A further 1200 liters of process water are added.

[0056] Nitrocellulose is stirred into the fiber mash. Weigh-in 120.0 kg.

[0057] Control of stock density approx. 8%

[0058] Addition of a further 1600 liters of process water.

[0059] Addition of Paragas: The Paragas is mixed with water and added to the batch while stirring.

[0060] The stabilizer Akardit is added: The Akardite is slurried in water and ground. It is then added to the batch while stirring.

[0061] 16.8 kg of WO.sub.3 particles are slurried in 32 liters of water and added to the batch while stirring.

[0062] The batch is pumped into the target container and diluted with process water.

[0063] The fibers are separated in special basins, which are in exchange with the target container, on sieve forms by suction. This produces the raw felt.

[0064] The raw felts are then pressed at approx. 170 C. During pressing, the water in the raw felt is removed by vacuum. In this step, the sleeve is produced in its defined shape.

[0065] The pressed sleeves are PU-impregnated by briefly immersing them in a bath of polyols with isocyanate crosslinker and then drying and curing them in a drying tunnel.

[0066] Conditioning in a standard climate (drying).

[0067] Mechanical cutting to length and chamfering.

EXAMPLE 2

Preparation of Combustible Sleeves for Artillery Ammunition

[0068] Steps 1-3 are identical.

[0069] Step 4 here is the addition of binding resin particles. These binding resin particles are later melted during pressing and bond the fibers together. These are polymers made from polystyrene-polybutadiene-latex.

[0070] Raw felt production and pressing analogous to the above process.

[0071] Step 11 is omitted here.

[0072] Steps 12 and 13 are carried out in the same way.

[0073] This is followed by a lacquer step. The lacquer is applied using an NC paint with the appropriate color pigment.

[0074] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations indicated, but also in other combinations or in a stand-alone position, without going beyond the scope of the present invention. The aforementioned advantages of features or of combinations of several features are merely exemplary and can take effect alternatively or cumulatively. The combination of features of different embodiments of the invention or of features of different claims is possible in deviation from the selected references of the claims.