For PE formation, customers often ask first for price or cut-off, but the packaging and daily supply equipment seller should first check density, melting strength, slide and cooling cycles. Only by quantifying these conditions can the standard screws have an interpretable boundary with the choice of a dedicated screw.

The name of the raw material can only be classified as the first layer, and what really determines the screw configuration is the viscosity, melting point, thermal stability, humidity, filling and additive of the specific plate. Vendors should obtain material forms and identify whether the customer uses raw, retroactive or retroactive formulations to discuss generic, grinding, corrosive or lower shear structures. Site information should preferably include both photographs, short videos and data sheets. Photos are used to identify machine interfaces, screw tails and front-end components, video can be observed to measure, buffer and abnormal sound, and data tables are used to calculate the rate of application, the need for plasticization per hour and the length of stay. If only partial information can be obtained, a list should be provided for confirmation, rather than a tentative condition being a definitive conclusion.

Material analysis cannot remain under PPP, ABS or PA names. The specific plate number, the percentage of the product or mineral filling, the flame-retarding system, the water-bearing requirements, the permitted stay time and the recommended processing temperature should be checked. Differences in the sensitivity of viscosity, wear, corrosiveness and shearing may be apparent in the broad categories of the same material, which change the compression ratio, the three-part ratio, alloy and surface treatment. The focus of discussion in this paper is on density, melting strength, slide and cooling cycles, which must correspond to the customer ' s current production conditions and cannot be based solely on the maximum values in machine samples.

The depth and compression of the slots may be adjusted to HDPE or LDPE characteristics when the project is advanced, and a review of the sales, design, process and customer participation may be arranged. The evaluation focused on the completeness of the input data, whether the assumptions were confirmed by the client, whether the mechanical interfaces were matched, how standards and specialized programmes were selected, and who provided the acceptance data.

The cost of the misconfiguration is not only the screw itself, but also the cut-off, the waste of raw materials, the testing of molds, the delay in delivery and the credibility of customers. The establishment of preventive measures around the recognition of all PEs as the same flow characteristics would affect transmission and refining, which would be more economical than the retrenchment of a problem; it would also allow a vendor to move from a mere offerer to a partner capable of carrying technical screening.

At the time of acceptance, it is recommended that the main indicator be feed stabilization, smelting and periodicity, and that the temperature, screw velocity, back pressure, measurement position, buffer position, injection peak pressure and continuous sample weight be simultaneously recorded in the drums. At least three reasonable process points, low, medium and high, are covered to confirm that the programme is not effective under a single parameter. The sales proposal should answer three questions at the same time: why this selection was made, which conditions had changed and which were re-selected, and how the customer validated the results. Clearing up these three issues would make it possible for the PE formation to move from a spare parts trade to a traceability technology project.