In the screw selection or failure analysis, how the reversible ring is often reduced to a specification at both the plasticization and injection stages, but in fact needs to be explained in conjunction with the full performance. The core is that the antireverse ring keeps the flowway open when the screw is rotated, and is closed by relative shift and pressure differentials when the screw is injected in front. The opening of the area affects the loss of plasticized pressure, the closing of the process and the decision of the contact area to block the response. The screwhead and the reversible ring are at the front end of high pressure, high temperature and fast-forward, and their mobility, sealing, strength and cleanness must be met simultaneously. The selection programme should draw the boundary of production, temperature rise, twirl and time of stay before determining whether the parameter pushes the work to an uncontrolled area. Nominal specifications are therefore only the starting point, and the final conclusions must serve the actual resin, product and volume rhythm.

When customizing around “how the reversible ring moves in two stages of plasticization and injection”, the equipment model, the original screw and the material drum are first collected for actual dimensions, driving capacity, resin number and filling system, single mass, cycle and existing defects. Specific selection principles for the topic are: high viscosity, low viscosity, filling and high-speed injections with different requirements for cyclic mass, gap and flow. If the device can export a curve, the original record of screw position, turn speed, twist, back pressure and time should be kept, so as to avoid only being assessed by the operator. 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 insurable failure of the subject is the slowness of plasticization caused by the blockage of the opening and the loss of gels, changes in material cushions and abnormal pressure curves caused by the slowness of the closing. Short-term increases in temperature or back pressure cover part of the structural problem but cannot be a long-term response if the twist, degradation or cycle deteriorates simultaneously. 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 approach can be used to verify “how the reversible ring moves in the plasticization and injection phases”: the stability of the two phases is determined by means of sealing tests, air-fired observations, pressure curves and successive weighing. Material furnace numbers, heat-processing curves, surface cross-sections and terminal records can be kept for key parts to facilitate the distinction between material and use when subsequent failures occur. 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.