Production method for preparing detonating tube with low cost and high strength through three-layer co-extrusion and production line thereof

Abstract

The invention discloses a production method for preparing a detonating tube with low cost and high strength through three-layer co-extrusion and a production line thereof. The production method comprises the following steps: firstly, plasticizing plastics; then, squeezing the plasticized plastic materials into a three-layer co-extrusion compound die head to form a three-layer co-extrusion compound billet tube; uniformly sticking fine explosive powder on the inner wall of the billet tube through the inner hole of the core rod of the die head, forcibly cooling the compound billet tube, sizing the compound billet tube in a vacuum mode, and then, cooling and forming the compound billet tube; heating and stretching the compound billet tube; cooling and forming the stretched compound billet tube to form the detonating tube; and finally, winding the formed detonating tube. By using the three-layer co-extrusion compound method for manufacturing a new detonating tube, the invention can ensure the advantages of the existing detonating tube and simultaneously can overcome the defects of small tension strength, inconvenient tube flexible construction, low yield, high energy consumption and the like of the existing detonating tube; and by changing formulas or raw materials of inner and outer layers, the invention can be used for preparing special detonating tubes with special performance.

Description

technical field [0001] The invention belongs to a production method and a production line of a plastic nonel, in particular to a production method and a production line of a low-cost high-strength nonel prepared by three-layer co-extrusion. Background technique [0002] At present, there are mainly two kinds of production methods of plastic (PE) detonators at home and abroad. The first one is the most common production technology of single extruded single-layer ordinary detonators in China. The advantages are: low cost, mature technology; disadvantages Yes: the tensile strength is small, and the nonel tube is soft and inconvenient to construct. Ordinary plastic detonators are generally The strength of the detonating tube can withstand a tensile force of 70N. The single-layer ordinary plastic detonating tube of a single extruder is blended and modified to increase the strength, and the tensile force can be increased to about 110N at room temperature. There is also the use ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are mainly two kinds of production methods of plastic (PE) detonators at home and abroad. The first one is the most common production technology of single extruded single-layer ordinary detonators in China. The advantages are: low cost, mature technology; disadvantages Yes: the tensile strength is small, the nonel tube is soft and inconvenient to construct, etc.

However, the tensile strength and production efficiency of plastic detonators are low

[0005] Detonation tube modification process and modification strengthening device (CN 14821111A) through multiple cold and hot stretching and setting, the molecular orientation arrangement of the original detonation tube is improved, and the tensile strength and oil resistance of the plastic detonation tube are improved. However, the plastic nonel produced has a single composition, and the composition of the inner and outer tube walls cannot be adjusted arbitrarily, so that it is impossible to prepare a special nonel with special properties (such as oil resistance, temperature resistance, etc.)

Images