Process for manufacturing granular igniter
First Claim
1. A method for manufacturing granular igniter comprising:
- a) forming a slurry by mixing an igniter material with an aqueous medium, said igniter material including a mixture of boron and potassium nitrate, in a weight ratio of said igniter material to the aqueous medium in a range from 100 to 60 to 100 to 140 by weight;
b) spraying the slurry in the form of droplets under a heated atmosphere in a spray dryer to obtain crude granular igniter;
c) subjecting said crude granular igniter to separation process by means of a cyclone cylinder to provide a first group of granular igniter and a second group of micropowder, the separated micropowder of said second group having an average diameter smaller than about 50 micrometers; and
d) recycling the micropowder separated in step c by mixing it with the slurry of step a.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a process for manufacturing a granular igniter, which facilitates control of the igniter preparation, handling of the granule igniter and improvement in manufacturized yield. The present invention also provides a process for manufacturing a granular igniter which is free from toxic gas generation when burned and which has excellent fluidity. The present invention moreover reduces the number of manufacturing process facilitating the production process, and reducing production costs.
An igniter containing boron and potassium nitrate are mixed together with water in a homogenizer to form a homogeneous slurry. The mixing ratio of the igniter to the water is set in the range of 1.0:0.6 to 1.0:1.6 in terms of weight ratio. The slurry is sprayed in a spray dryer where it is dried and granulated. Micropowder, which failed to be collected as the granule, is recovered through a cyclone, and recirculated as the raw material.
32 Citations
23 Claims
-
1. A method for manufacturing granular igniter comprising:
-
a) forming a slurry by mixing an igniter material with an aqueous medium, said igniter material including a mixture of boron and potassium nitrate, in a weight ratio of said igniter material to the aqueous medium in a range from 100 to 60 to 100 to 140 by weight; b) spraying the slurry in the form of droplets under a heated atmosphere in a spray dryer to obtain crude granular igniter; c) subjecting said crude granular igniter to separation process by means of a cyclone cylinder to provide a first group of granular igniter and a second group of micropowder, the separated micropowder of said second group having an average diameter smaller than about 50 micrometers; and d) recycling the micropowder separated in step c by mixing it with the slurry of step a. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for manufacturing granular igniter comprising:
-
a) forming a slurry by mixing an igniter material with an aqueous medium, said igniter material including of mixture consisting of boron and potassium nitrate, in a weight ratio of said igniter material to the aqueous medium in a range from 100;
60 to 100;
140 by weight;b) spraying the slurry in the form of droplets under a heated atmosphere to obtain crude granular igniter; c) subjecting said crude granular igniter to separation process by means of a cyclone cylinder to provide a first group of granular igniter and a second group of micropowder, the separated micropowder of said second group having an average diameter smaller than about 50 micrometers; and d) recycling the micropowder separated in step c by mixing it with the slurry of step a.
-
-
14. A method for manufacturing granular igniter comprising:
-
a) forming a slurry by mixing an igniter material with an aqueous medium, said igniter material including a mixture of magnesium and polytetrafluoroethylene both bound to each other by an inorganic binder, in a weight ratio of said igniter material to the aqueous medium in a range from 100 to 60 to about 100 to 140 by weight, a weight ratio of magnesium to polytetrafluoroethylene in a range from 7 to 3 to about 3 to 7; b) spraying the slurry in the form of droplets under a heated atmosphere in a spray dryer to obtain crude granular igniter; c) subjecting said crude granular igniter to separation process by means of a cyclone cylinder to provide a first group of granular igniter and a second group of micropowder, the separated micropowder of said second group having an average diameter smaller than about 50 micrometers; and d) recycling the micropowder separated in step c by mixing it with the slurry of step a. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method for manufacturing granular igniter comprising:
-
a) forming a slurry by mixing an igniter material with an aqueous medium, said igniter material including a mixture consisting of magnesium and polytetrafluoroethylene both bound to each other by an inorganic binder, in a weight ratio of said igniter material to the aqueous medium in a range from 100;
60 to 100;
140 by weight, a weight ratio of magnesium to polytetrafluoroethylene in a range from 7;
3 to 3;
7;b) spraying the slurry in the form of droplets under a heated atmosphere to obtain crude granular igniter; c) subjecting said crude granular igniter to separation process by means of a cyclone cylinder to provide a first group of granular igniter and a second group of micropowder, the separated micropowder of said second group having an average diameter smaller than about 50 micrometers; and d) recycling the micropowder separated in step c by mixing it with the slurry of step a.
-
Specification