The return on investment [situation definition] to increase the rate of return on the assessment of a dedicated screw is based on the real production scene of the plant and cannot be seen only in the diameter of the screw or in the price quoted. It is recommended that the purchase price, scrap, energy consumption, stoppage and spare parts be first collated, and that process values be recorded separately from the actual on-board values to facilitate the detection of control deviations. The aim of this step is to establish comparable old programme benchmarks so that subsequent screw changes can be supported by data.

The most easily ignored of the topic is the cost of a single eligible item and the full life cycle. Plants should establish a strict ranking of various feedstocks, establish boundaries according to the highest risk conditions, and write quality standards into quantum sets, sample numbers, upper and lower limits and determination rules. Vendors can make retroactive trade-offs between interoperability, earmarking and cost when there are clear values for product weight, daily production, customer quality caps and allowed stop times.

[Design Focus] The main line of this case is to replace the simple price with TCO and the current cycle. In geometry and materials programmes, the base, alloy layer and surface treatment should be selected on the basis of grinding, corrosive and thermal loads; and the converse ring structure and reflow gap should be assessed on the basis of material fluctuations and injection pressure. The final solution would also need to be compatible with the wear and tear of the cylinder, the drive, the physical velocity and the current cleaning process, and would not cover up co-operation or process problems with a single high-level material.

The new [comparison-valid] programme proposes to operate for at least 72 consecutive hours, extracting 50 sims per stabilization phase and recording the number of downtimes, maintenance hours and the combined cost per 10,000 items. The test shall first establish a stabilization point at a medium rotation rate and a medium back pressure, then gradually expand the process window, and also maintain sufficient time to observe the twist, temperature and measure drift under the normal upper load. If only the first one is checked, it is easy to miss the risks associated with heat drifting, material stoppage, reversal loop return and prolonged wear and tear.

When the [stabilized production] spiral is shaped, the only asset-numbered associated drawings are applied, repair, put on the machine and take off the record, and the cold-started temperature-preserve time and the twirl is allowed to avoid cold-temperature forced storage. The time of storage, back pressure, screw velocity, noise and mass of the product shall be recorded in a uniform manner in the shift. When the above indicators change at the same time, the mechanical gaps and the state of the raw materials should be checked before the process is adjusted to avoid the use of parameters to compensate for hardware degradation.

The cost statement [comprehensive cost] could not simply be a screw price, but should include in TCO the quantification of on-site support from suppliers, spare parts handover and failure analysis response time, in addition to the analysis of single-unit energy consumption in conjunction with storage time to avoid looking only at the total of the meters and ignoring output differences. It is recommended that the cost per 10,000 eligible items be exported simultaneously, the cost per 1,000 operating hours and the estimated number of return months. When new programmes reduce waste, refuelling or sudden shutdowns, higher initial inputs are often offset during production.

The [Closed Ring Management] will eventually include drawing numbers, screwdriver materials, heat treatment, critical dimensions, portable tubes, process windows and acceptance data in the curriculum vitae cards. It is proposed to set warning limits for the thermozones and the drive loads of the cylinders, instead of looking at averages only, and to establish a system of metallic insulation and magnetic insulation, as well as to check for prune damage after anomalies. When there is a significant change in the feedstock formulation, retrospective ratio, product structure or target node, the applicable boundary “to increase the return on the investment of the dedicated screw at a good rate” should be reassessed, rather than defaulting that the old conclusion is permanently valid.

Topic: Energy consumption, good rates and combined costs