How fire work are made?

Answer 1

Fireworks tubes are made by rolling thick paper tightly around a former, such as a dowel. Though they can be made by hand, most firework/tube factories use machinery to manufacture tubes. Whenever tubes are used in fireworks, at least one end is always plugged with clay to keep both chemicals and burning gases from escaping through that end. The tooling is always made of non-sparking materials such as aluminum or brass. Clay is inserted into the tube and then consolidated with the rammer using a heavy object such as a mallet (or possibly a fruit cake). A sleeve is sometimes used during the ramming process to prevent the walls of the tube from splitting or bulging. 1. To make a typical square-shaped repeater, several clay-rammed tubes are glued to each other in rows. Often a "sandwich" is made by placing thin cardboard strips on either sides of the tubes for strength. 2. Two holes are then drilled in each tube. Small pieces of fuse are placed in the holes to rapidly transfer fire from tube to tube. 3. Rows of tubes are glued on top of each other, and fuses are inserted to transfer fire between rows. 4. The battery of tubes is then stood upright, and a small, measured black powder lifting charge is put into each tube. After that, a small tube containing aerial effects (stars, whistles, hummers, etc.) is placed into each larger tube. 5. Finally, the bottom and sides of the repeater are covered in another layer of thin cardboard to hold it together, followed (usually) by plastic cellophane on top and a colorful label on the side.