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                Welcome Yangzhou Deyou Line Cable Co.,Ltd Website!

                Phone: 0514-88781898   13801440700      

                The quality defects and treatment methods common in extrusion process

                Plastic coke is a common quality defect in the process of plastic extrusion. There is a large amount of smoke, intense stimulation and a burst of explosion. The extruded plastic layer has the focus.

                The quality defects and treatment methods common in extrusion process

                 

                1. Plastic coke burning: plastic coke burning is a common quality defect in the process of plastic extrusion. There is a large amount of smoke, intense stimulation and a burst of explosion. The extruded plastic layer has the focal granule; The joint has continuous air bubbles; The main reasons are:

                1) temperature control reaches the thermal degradation temperature of plastic;

                2) the screw has not been cleaned for a long time, and the accumulated coke is extruded with molten plastic;

                3) if the temperature is too long, the plastic can be decomposed in a long time.

                4) the thermometer is out of control or inaccurate, causing high temperature decomposition.

                5) the extruder cooling system is not opened, causing the material shear friction to overheat. Therefore, it is necessary to strengthen the checking of heating and cooling system during extrusion process. The setting of extrusion temperature shall be determined according to the technological requirements and the rotation speed of the screw. Reasonable control and temperature time, regular extrusion system cleaning.

                 

                2. The plasticization problem of extruder was mentioned in the previous reference to the temperature control requirements. The main performance of plasticization is: the cladding layer has toad skin sample; Plastic surface hair, dull, and small cracks; The extruded layer has obvious seam at the glue place; The main reasons are:

                 

                1) the temperature control is too low, especially the head part;

                2) other plastic particles mixed with different properties in insulation or sheath materials;

                3) the screw turns plastic too fast and the plastic is not completely plasticized;

                4) there is a quality problem in the plastic itself. For the above reasons, it is important to pay attention to the rationality of extrusion temperature control. Should confirm the quality of the receiving materials; You can't increase the extrusion speed by simply pursuing production. Strengthen the preservation of raw materials, especially in the plastic drying process; Rational distribution to enhance extrusion pressure and screw reflux.

                 

                3. The main causes of the hole or air bubbles in the extruded layer are:

                 

                1) excessive temperature control (especially the feeding section);

                2) moisture in plastic moisture;

                3) long time parking, the decomposition of plastic is not clear;

                4) high humidity of natural environment;

                5) high content of water or gasification in the cable core.

                 

                For the above reasons, it is necessary to control the temperature of the bolt. Pre - drying of materials used; Strict process operation requirements to improve the evaluation ability of plastic plasticization; Pay attention to the production environment and storage conditions of materials. The size of the pack is not qualified, the main performance is the partial core; The thickness of the sheath or the outer diameter is too poor; The main performance of the extruded package is the chafing on the surface of the extruded layer. Rough with trachoma or microcrack; Any defect caused by the amount of plasticization.