# US 4,392,410 A · Ultrasonic loading of extrudable plastic bonded explosives

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,392,410 A
- Document ID: US4392410A
- Status: Granted
- Kind: A
- Application number: 06/279,644
- Filed: 1981-07-02
- Granted: 1983-07-12
- Earliest claimed: 1981-07-02
- Assignees: The United States of America as represented by the Secretary of the Navy
- Inventors: Robert R. Durrell
- Web page: https://patentgrep.com/patent/US4392410A

## CPC

- C06B 21/0075: {by extrusion}
- F42B 33/0207: {Processes for loading or filling propulsive or explosive charges in containers}
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

A method for loading a plastic bonded explosive by the use of ultrasonic rations and moderate pressure.

## Claims

### Claim 1

A method for loading extrudable plastic bonded explosives into long small diameter orifices contained in a warhead initiation system comprising pressurizing the loading system with an inert gas at pressures in the range of 1000 to 2000 psi and providing ultrasonic vibrations on the loading system in the range of from 20K H.sub.z to 30K H.sub.z.

### Claim 2 (depends on 1)

The method of claim 1 wherein the ratio of length of orifice to diameter of orifice exceeds 200.

### Claim 3 (depends on 1)

The method of claim 1 wherein ultrasonic vibrations exceed 20,000 Hertzes per second.

### Claim 4 (depends on 1)

The method of claim 1 wherein the gas used to pressurize the extrusion system is nitrogen.

### Claim 5

Apparatus for ultrasonic loading of extrudable plastic bonded explosive into a warhead initiator comprising in combination, an ultrasonic transducer, an extrusion nozzle, a curved coupler exponential horn, an extrusion cavity, an adapter, a preloaded hydrostatic chamber for loading a plastic explosive composition into the extruder and means to supply pressurized gas at pressures from 1,000 to 2,000 psi to the extrusion cavity.

### Claim 6 (depends on 5)

The apparatus of claim 5 wherein the extrusion nozzle is tapered.

### Claim 7 (depends on 5)

The apparatus of claim 5 wherein the nozzle is tapered by a Morse taper.

### Claim 8 (depends on 5)

The apparatus of claim 5 wherein the ultrasonic transducer produces vibrations in excess of 20,000 hertzes per second.

### Claim 9 (depends on 1)

The apparatus of claim 1 wherein the pressure is less than 1500 psi.