尼龙加工（Nylon processing）.docVIP

尼龙加工（Nylon processing） The processing temperature of nylon is relatively narrow, the main temperature should be controlled, and the temperature must be in place, and the viscosity of nylon is large, otherwise, as the 3rd floor said, it will damage the head Manufacturing process of nylon sheath Manufacturing process of nylon sheath Because of the different properties of nylon material, some unique technological requirements are put forward in the extrusion process. The following main requirements for the production process are discussed. 1. Drying process Because of the nylon material is medium polarity, easy absorption of moisture, according to material manufacturer  when nylon material moisture content over 0.3%, cant squeeze out, in the actual production process found that nylon is expected to be affected with damp be affected with damp, extrusion sheath will blister  such as bubbles, granular or damaged. Nylon 6 with vacuum bag vacuum packaging material itself, not broken packages can be directly cast people use, but such as damage during the transportation process, sealed or open package are not finished in time, etc., must be dried before use. So it should be pre-dried before the moisture is used. It is better to remove water by using vacuum and rotary barrel, and can not dry more than 3/5. Such as allowing people quantity is too large, material is difficult to spin dryer, cause uneven heating, short time water is difficult to remove all  long time can make the yellow part material oxidation, unable to meet the requirements of extrusion surface. Vacuum degree of vacuum should reach more than 0.05 MPa, or it will be hard to remove moisture, if by steam heating, water steam to control the heating temperature, temperature appropriate for 80 + 50 ℃, the heating temperature is too high the nylon material oxidation and become yellow. Extruders requirements Extruder has vertical and horizontal two kinds. The diameter ratio of screw length is 20. 1. 1. The clearance