SU23904A1 - The method of obtaining igniter cord - Google Patents

Description

Bickford Shiur; usually used in the bottom case, has, despite | their merits, some under-1 stats related to the instability of its shells: inner jute and outer | paper, covered with glue and gutta-percha mastic, or some resinous waterproof substance. From the dryness of the premises gutta-perchev | the insulation is cracking; it is moldy from excessive dampness; in some repairs, especially with liquid air, the sheath of the shiur smolders and burns. The proposed method of treating a bickford fused casing is intended to eliminate these drawbacks, makes the casing non-wobble, and therefore bickford-fed hides become suitable for many works with explosives. This method consists in the following operations with braid threads.

1. Soak them in an aqueous solution of aluminum sulphate; the strength of the solution and the soaking time depend on the soaking method and the type of yarn. When applying vacuum, half an hour is enough to soak the threads in the solution, without vacuum, it takes several hours.

2. Transfer the threads to the bath with a solution of soda or ammonia. The strength of the soda or ammonia solution and the residence time of the filaments in the solution depend on the soaking method and the type of yarn. As a general rule, it is necessary to keep them in soda solution until the release of gas bubbles and to accelerate here. The use of vacuum is especially recommended.

3. Wash the threads in clean water.

4. Pulling them when G is not higher than 60-80

5. The dried filaments are immersed in a bath of soluble soda glass. The strength of the solution and the winding time, depending on the method of soaking and the type of thread.

6. Then the filaments are transferred to the bath from a saturated solution of aluminum sulphate.

7. Washing the threads in clean water.

8. Drying them with f not more than 60-80f.

9. Dried threads go for braiding, but after two times the braid of the cord is rubbed with talc with a small admixture of a solution of table glue or other bonding agent. In addition to talcum powder, other non-flammable powders can be used, for example. powdered alumina, clay powder, etc. Instead of aluminum sulphate, alum can be consumed, the soda solution can be replaced with ammonia solution, which, as you have seen in practice, reacts better than soda solution.