[Scene definition] How a multi-product plant builds a screw family and selection matrix is to start from the real volume scene of the plant, not just the diameter or price of the screw. It is recommended that baseline data, control tests, process capabilities and résumé records be first collated, and that early warning limits be set for the thermozones and driver loads of the cylinders, rather than only averages. 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 overlooked of the topic is the coherence between short-term improvements and long-term stability. Plants should divide needs such as appearance, size, strength and odor into necessary and optimized items and establish a strict ranking of various feedstocks to determine the boundary according to the highest risk conditions. 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.

The main line of the case [design focus] is to determine whether or not to stereotype and reproduce using reversible data. In geometry and materials programmes, the gap between the reverse ring structure and the reflow should be assessed on the basis of material fluctuations and injection pressure; and the measurement segment should be synchronized with the required back pressure, without excessive back 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 validation] programme proposes to operate for at least 24 consecutive hours, with a 30-mode extraction for each stabilization phase, recording the replacement time, the amount of excess waste and the first eligible time. A planned refuelling test should be added to the test to examine residues, black spots and cleaning material consumption, and to compare the old and new programmes with the same batches of raw materials, molds and sampling rhythms. 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, trend maps should be created for the plume diameter, the reverse ring gap and the inside of the cylinder, and spare parts should be discharged early when the wear and tear trend is close to the threshold and not be processed until the quality is out of control. 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 [comprehensive cost] cost statement should not only be a screw price, but should set up three life-cycle scenarios that are optimistic, benchmark and conservative to prevent a single assumption from magnifying the return on investment, and to quantify on-site support from suppliers, spare parts delivery and failure analysis response times into TCO. 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 recommended that process values be recorded separately from the actual on-board values to facilitate the detection of control deviations, and that screwhead components or spare parts be prepared for key platforms, and that the availability be periodically reviewed. When there is a significant change in the feedstock formulation, retrospective ratio, product structure or target node, the applicable boundary of “how a multi-product plant creates a screw family and selected matrix” should be reassessed, rather than defaulting that the old conclusion is permanent.

Title of article: A guide to the selection of a plastic factory at the end Data validation and continuous improvement