The fuse refers to a cable-like detonating device with a certain density of powdered or granular black powder as the core and coated with cotton thread, plastic, paper strip, asphalt and other substances.
It is mainly used to ignite fire detonators or black powder, and is also often used as a delay element in delay electric detonator. When the fuse is squeezed by external force, the change of core density leads to the change of burning rate and even deflagration, resulting in blasting accidents.
There is something called potassium nitrate stuck on the surface of the fuse. When firecrackers are lit, potassium nitrate decomposes oxygen, so that the combustion will not be interrupted. That's why firecrackers keep exploding.
Extended data
1, Papermaking: Although the paper used to make firecrackers is purchased, the paper used to make leads is self-produced, and there will be a pulp pool in the workshop to make paper with wood pulp;
2. Paper cutting: cut the whole paper into long strips;
3. Introduction: Fix one end of a long piece of paper, unfold the paper, dip an iron bar with nitric acid powder, and when your hand shakes, the nitric acid powder on the iron bar will fall on the paper to form a long strip. When you rub your hands, you will get a lead;
4. Pulp lead: This lead is still loose. Workers should dip their hands in the wet rice paste, draw the lead, and the lead will not be loose when dipped in the rice paste. Then they need to fix the wires one by one on a dryer like a fan to dry.
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