[Scene definition] screw selection of PET and PBT products: Drying and plasticization must start from the real extent of the plant, not just the diameter of the screw or the price. It is recommended that the resin viscosity, heat sensitivity, additives and retrospect ratio be first organized, 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 easy to ignore is the risk of degradation of plastic windows and materials. Plants should bind the planned lifetime to the hours of operation, the type of material and the frequency of maintenance, and place red lines of quality and equipment loads at the same time for key products. 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 in this case is the geometry of the screws with real cards and formulas. In the geometric and material programme, the retrofitting, reflowing and screwhead residual areas should be checked for retorting and retorting; and the retorting, retort and screwhead residual areas should be checked for retorting and retorting. 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. The test shall be conducted for a sufficient period of time under the normal maximum load to observe the twisting, temperature and measurement of drift, with only one factor to be changed at each time and a flight phase to restore the baseline conditions. 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] screw is shaped, the key platform shall be prepared for a screwhead component or full-assembly spare parts, and its serviceable status shall be reviewed on a regular basis, and the abnormal twisting, storage timeout and material rebound shall be set as an early overhaul signal. 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 [integrated cost] cost statement should not only be a screw price, but should also account for test simulators, cleaning materials, transitional materials and bad goods at real procurement prices, as well as quantifying on-site vendor support, spare parts delivery and failure analysis response times. 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 setting values be recorded separately from the actual on-board values, to facilitate the detection of control deviations, and to provide for cold start-up temperature protection time and to allow recoiling to avoid cold-temperature forced storage. The applicable boundary between “PET and PBT product screw selection: drying and plasticization” should be re-evaluated when there is a significant change in the feedstock formulation, feed ratio, product structure or target node, rather than defaulting that the old conclusion is permanent.

Title of article: Guidelines for the selection of a plastic factory for end-of-service reference