The winding tube is produced by heat setting process, which is generally divided into two types: primary setting and secondary setting.
One-step setting process: nylon or plastic granular materials are heated, plasticized and extruded into thin strips by a plastic extruder, and the strips are extruded from the die of the head and wound on mandrels of different specifications held by the winding machine without water cooling, and then cooled and set by cooling water, and then separated from the mandrels to form a spiral sheath.
secondary molding process: nylon or plastic particles are extruded into thin strips by an extruder and then cooled by cooling water; The cooled strip is wound on mandrels with different specifications by a winding machine; And then pushing the mandrel into a vulcanizing tank for heating and vulcanizing. After a certain period of time, it can be taken out of the can and separated from the mandrel to form.