In a screw selection or failure analysis, the long-range retrofit of the equipment is often simplified as a specification value in comparison with the installation size limits, but in practice it needs to be explained in conjunction with the full performance. The core is to increase the length of the system in relation to the total length of the screw drum, the heating area, the shield, the nozzle centre and the radial process. Even if the screws are capable of being manufactured, frame, drive, sensor and electrical control do not necessarily allow for a direct length increase. The long-range ratio is only a geometric entry, and what really determines is the effective length, distribution of the functional segments, actual production and material heat history. It is recommended that the snails be expanded and the axle-sized chain compared to the material melting route, so that it can be seen which area is actually carrying the transmission, pressure or amalgamation function. Nominal specifications are therefore only the starting point, and the final conclusions must serve the actual resin, product and volume rhythm.

When customizing around “the long-range relative to the size of the installation at the time of equipment retrofitting”, the equipment model, the original screw and the material drum are first collected for actual dimensions, driving capacity, resin number and filling systems, single total quantity, cycle and existing defects. Specific selection principles for this topic are that: the installation of benchmarks, keys, flannels, nozzles, heating power, itinerary and safety protection should be checked prior to modification. The high-yield project should also reconcile the heat load of the speed-reducing box with the electric power to avoid a long-term overload of the propeller itself. The technical agreement should include quantifiable provisions for size benchmarks, key communications, material status and acceptance methods so that new, old and subsequent restorations can be compared under the same criteria.

The most important defence against the failure of this theme is that neglecting the package would result in no nozzles capable of misaligning medium- and temperature-controlled areas, excess range or driving overload. Bad pictures are bound to the same pattern as the equipment curve and raw material records, otherwise only the defective name cannot be judged to have been caused by a screw. For on-site processing, only one main variable is changed each time and the measurement time, twist, melting temperature, mat, injection pressure and product weight are aligned to the same pattern. If production is to be sustained by excessive temperature, turn speed or back pressure, the use of parameters to mask structures, wear or collage should be discontinued.

This replicable option can be used to validate “the long-range relative to the size of the installation when the equipment is retrofitted”: to complete the dimension chain review and site mapping, and to validate the temperature zone, itinerary, twist and shield locks during the test run. For multi-plant reproduction projects, uniform test, sample size and determination rules should be used in order to avoid subjective variations among different groups. Inquiries to suppliers should also be accompanied by information on resins and fillings, risk of flame retardation or corrosion, total weight of products and fluids, photographs of available screws and equipment curves. The programme is considered to have a stable engineering value when the detection data, the good product rate, the timing of the switch and the unit cost of the eligible goods are improved.