What Are The Reasons For Stress Cracking Of ABS Injection Molded Parts?

There are many factors affecting the quality of ABS injection molded parts. Stress cracking is one of the common fatal defects, which seriously hinders the application of ABS injection molded parts. 3 Inch Plastic Stopper Wholesaler to analyze with you.

Stress classification and production process After the polymer is stressed, the internal force will be balanced with the external force, and the internal force per unit area is called stress. The stress can be classified into internal stress and external stress depending on the cause of formation. Internal stresses include active stress and induced stress. The active stress is an internal force that is balanced with an external force (injection pressure, holding pressure, etc.) and is also called forming stress.

                                                                                        
Stress cracking is one of the quality problems often encountered in injection molded parts, especially in the northern part where the temperature difference of the climate changes greatly, the stress cracking phenomenon is more prominent. Cracks occur in places where stresses such as gates, edges, and welds are concentrated. In addition, due to the effect of stress, the parts often have defects such as deformation, warpage, and distortion. The internal stress takes corresponding measures from the molding process and can generally be reduced to a lower limit. The external stress is often neglected so that the cracking of the injection molded part is completely attributed to the stress generated during the molding process so that the quality problem cannot be fundamentally solved.

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