“How material turns yellow is judged to be temperature or stopover” is often valued only after defects in the product have occurred, but it is more effective to establish test boundaries before testing. The key mechanisms of this theme are that yellow change is associated with actual melting temperature, oxidation, stopover, moisture and stabilizer consumption and requires time to be separated from temperature. Appearance defects are often caused by a combination of moisture, gas, materials, plasticization, moulds and equipment, and must be distinguished by evidence. Therefore, the name of the material and the recommended setting can only be used as a starting point, and the actual judgement is to return to the plate number, water, filling and assistor, the single total quantity, cycle, screw structure and product requirements to confirm whether the temperature, cut and stay of the material in the equipment is safe.

At the test-model or volume-import stage, a list of inputs should be established around “how to judge temperature or stay in case of material yellow changes”, including feedstock suppliers and batches, technical data sheets, drying conditions, colour mother and respirator ratios, equipment and screw specifications, product and flow weight, mold temperature and existing defects. For products with multiple cavities or thin differences, the weight of the cavities should also be compared with the critical dimensions to prevent averages from covering up local problems. The main risk to the subject is that only a reduction in the set temperature may cause unsmelting, while the problem actually comes from a dead end or stopover. Parameters must be recorded in a specific pattern to distinguish material from equipment from operational changes.

Control methods should not begin with blindly increasing temperature or pressure, but should be based on "substance state - feed drying" The sequence of screw plasticization - nozzles and fluids - product results. Transparency, medical treatment or food-related products also need to be integrated into the same set of acceptance standards for cleaning, smell, analysis and traceability. The site adjusts only one main variable at a time, while observing the actual melting temperature, measuring time, screw twists, mats, injection pressure, product weight, colour, scent and critical dimensions. If production can only be sustained by extreme parameters, the use of a switch to cover the material or hardware boundary should be discontinued.

The verification of “temperature or retention of materials by yellow changes” suggests a repertoireable approach: a two-dimensional test of temperature and presence to record colour differences, melting temperatures, odour and pressure. Should the supplier or batch be replaced, it should be reconfirmed using the same set of tests, moulds and test conditions, rather than simply following the old conclusions. The technical agreement between the supplier and the plant shall state the material, the sampling method, the detection project, the permitted scope and the change notification requirements. The plasticization programme can only be considered to have long-term quantitative value if the product ' s probabilities, performance, cyclicality, energy consumption and maintenance costs are met in a continuous production process.