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Firework cotton particle size control method

A particle size control and fireworks technology, applied in grain processing and other directions, can solve the problems of high requirements for crushing equipment, effective control, and large material particles, and achieve the effects of high production efficiency, uniform discharge size, and long-term stable operation.

Pending Publication Date: 2022-02-25
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention application with the publication number CN109320387A discloses a cellulose powder for luminescence spraying fireworks and its preparation method, in which the particle size of the material is not effectively controlled, and the material particles are relatively large; the Chinese invention patent with the publication number CN109251116A A production method of nitrocellulose for indoor fireworks is disclosed. The Chinese invention patent with publication number CN109438146A discloses a slurry method production process for indoor fireworks with nitrocellulose. The Chinese invention patent with publication number CN110540484A discloses a firework Using the continuous preparation process of nitrocellulose, the above invention patents only rely on crushing equipment to crush the material into powder, which has high requirements on the crushing equipment. Long-term operation in production cannot ensure that most of the material particle size is within 80-100 mesh, and it needs to be replaced frequently Spare parts, high maintenance cost

Method used

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  • Firework cotton particle size control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Extrude the fully plasticized dough-like nitrocellulose through the small hole on the discharge die to extrude a φ2.5mm strip. One revolution of the cutter can cover all the discharge holes on the cutting die surface. The thickness of the cutter blade is 0.1mm, the angle between the blade orientation and the rotation direction is 30°, and the distance between the blade and the surface of the die head is 0.1mm. While granulating, punch the cutting surface with water, the granulating speed is 150r / min, the length of the discharged grain is 3.5mm, and it is washed into the trough by water. The homogeneous grinder adopts 3 layers of rotor stators, the outermost layer has an impeller, and the gap is 1.5mm, the gap between the middle layer is 0.5mm, and the gap between the last layer is 0.3mm. , The vibrating screen adopts a single-layer 60-mesh screen, the unscreened material falls back to the trough, and the screened powder and water are centrifugally dehydrated. The parti...

Embodiment 2

[0025] Extrude the fully plasticized dough-like nitrocellulose through the small hole on the discharge die to extrude a φ2.7mm strip. One rotation of the cutter can cover all the discharge holes on the cutting die surface. The thickness of the cutter blade is 0.2mm, the angle between the blade orientation and the rotation direction is 20°, and the distance between the blade and the surface of the die head is 0.06mm. While pelletizing, punch the cut surface of the die head with water, the pelletizing speed is 210r / min, the length of the discharged pellet is 4mm, and it is washed into the trough by water. The homogeneous pulverizer adopts 3-layer rotary stator, the outermost layer has an impeller, and the gap is 1.8mm, the gap between the middle layer is 0.8mm, and the gap between the last layer is 0.4mm. , The vibrating screen adopts a single-layer 60-mesh screen, the unscreened material falls back to the trough, and the screened powder and water are centrifugally dehydrated. ...

Embodiment 3

[0027] Extrude the fully plasticized dough-like nitrocellulose through the small hole on the discharge die to extrude φ3mm strips. One rotation can cover all the discharge holes on the surface of the cutting die. The thickness of the cutter blade is 0.5mm, the angle between the blade orientation and the rotation direction is 10°, and the distance between the blade and the surface of the die head is 0.01mm. While pelletizing, punch the cutting surface with water, the pelletizing speed is 300r / min, the length of the discharged pellets is 4.5mm, and the pellets are washed into the trough by water. The homogeneous grinder adopts 3 layers of rotor stators, the outermost layer has an impeller, and the gap is 2mm, the gap between the middle layer is 1mm, and the gap between the last layer is 0.5mm. The sieve adopts a single-layer 60-mesh sieve, and the unscreened material falls back to the trough, and the sieved powder and water are centrifugally dehydrated. The particle size of the...

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Abstract

The invention relates to the field of firework cotton preparation methods, in particular to a firework cotton particle size control method capable of effectively increasing the proportion of firework cotton meeting the particle size requirement in a product. The firework cotton particle size control method comprises the following steps that: a, completely plasticized dough-shaped nitrocotton is extruded out through small discharging holes in the section of a discharging die head to form strip-shaped objects, wherein the central axis of a single-blade cutter of a pelletizing device and the central axis of the tangent plane of a discharging die head are arranged in a non-collinear manner; b, material particles which are cut by the single-blade cutter of the pelletizing device and are uniform in particle size are fed into a material groove, and then the material particles are fed into a homogenizing pulverizer after the slurry is stirred uniformly, wherein the concentration range of materials fed into the homogenizing pulverizer is 10%-20%, and the homogenizing pulverizer comprises at least three layers of rotors and stators; and c, after being crushed and discharged by the homogenizing crusher, the materials enter a vibrating screen, the particle size of the materials crushed and discharged by the homogenizing crusher ranges from 80 meshes to 100 meshes, the sieved powder and water are centrifugally dewatered, and finally a firework cotton product is obtained. The method is particularly suitable for firework cotton production and preparation.

Description

technical field [0001] The invention relates to the field of preparation methods of fireworks cotton, in particular to a method for controlling the particle size of fireworks cotton. Background technique [0002] The luminescent smokeless fireworks are made of metal powder with a low ignition point, mixed with energetic materials and processed in a certain proportion. The main component of the energetic material is nitrocellulose. In order to facilitate filling and mixing with other fireworks additives, its particle size is required to be kept at 80-100 mesh. The Chinese invention application with the publication number CN109320387A discloses a cellulose powder for luminescence spraying fireworks and its preparation method, in which the particle size of the material is not effectively controlled, and the material particles are relatively large; the Chinese invention patent with the publication number CN109251116A A production method of nitrocellulose for indoor fireworks is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C18/00B02C23/16
CPCB02C18/00B02C23/16
Inventor 袁满张仁旭阳洪邱清海王源马君
Owner SICHUAN NITROCELLULOSE CORP