The three sets of evidence for particle state, fusion performance and finished product quality should be matched when evaluating “why pre-crystaling and drying are important at the time of PET. The key mechanism for this topic is that PET particles may be glued to high-temperature drying, pre-crystals and low-earth drying for stabilizing the feed and avoiding hydrolysis. Engineering plastics are often combined with wetting, high viscosity, crystallization or heat-resisting characteristics, and the drying, melting, modulation and stay must be coordinated. 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 simulation or volume import stage, a list of inputs should be established around “why pre-crystaling and drying when PET is retrofitted”, including feedstock suppliers and batches, technical data sheets, drying conditions, colour mother and feed ratios, equipment and screw specifications, product and flow weight, model temperature 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 theme are the direct high-temperature drying of unpremedicated crystals and a decrease in the water over-spectrum characteristics. 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 validation of “pre-crystals and drying at the time of PET plating” suggests a repetitious approach: examination of the state of particles, water-bearing rates, IV values, twists and product strength. A baseline should be established after the first eligibility and the water-bearing rate, melting temperature, measuring curves and critical energy should be measured by production tonnage. 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.