In the material selection and on-site modems, whether the “melt index MFI directly represents the retrofit flow” cannot rely solely on the supplier's temperature table, but also on a genuine product validation. The key mechanism for this theme is that MFI is a single-point mobility indicator for temperature and load, which does not fully represent the actual cut range and melting elasticity. Melting viscosity is influenced by both the temperature, shear rate, pressure and thermal history, and equipment values must be calibrated in measured state. 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, an input list should be established around whether “the Melting Index MFI directly represents the retrofit flow”, including feedstock suppliers and batches, technical data sheets, dry conditions, the ratio of colored mothers and retrofits, specifications of equipment to screws, product and flow weights, the temperature of moulds and existing defects. The detection sites should cover dryer exports, aircraft-side pyrotechnics, air-launched molten products and products, so as to avoid drawing conclusions only at one point. The main risks of this subject are that the only MFI replacement number ignores the molecular mass distribution and the differences between additives and high-cut responses. 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. The refuelling, shutdown and clean-up are part of the plasticization process and should be standardized and versioned with normal production parameters. 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 validation of the “molecular index MFIs directly represents plastic mobility” suggests a repertoireable method: joint assessment of MFIs with current curves, actual pressure, melting lines and product performance. It is recommended that a valid window be entered into the material database and that the approving officer, date, equipment, screw and raw material version be recorded. 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.