With regard to tubes and valves, customers often ask first for price or term, but the pipe sales team should first check the wall thickness, large-jet volume, PVC or engineering material and long 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 industry itself is not an optional parameter, but it points to a quality focus and production rhythm. Car projects focus on long-term stabilization and traceability, medical projects on cleanliness, packaging projects on high speed, optical items on low pollution and low stress. Plant manufacturers should translate these industry requirements into verifiable screw and process indicators. 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.

Technical communication distinguishes between three types of objectives that must be met, desired improvement and acceptable. It is necessary to meet the hard boundary of the item for the determination of equipment and screws, and it is hoped that the improvement item will be used for the comparison of standards and specialized programmes, while the acceptable item will help to control costs and deadlines. This would avoid stacking all requirements on a screw and would make it easier for clients to understand the real value of each configuration. The focus of discussion in this paper is on wall thickness, large-jet, PVC or engineering materials and long cycles, which must correspond to the customer ' s current production conditions and not be limited to the maximum values in machine samples.

In the context of this project, it is proposed to adopt the concept of “high-capacity, low-cut, low-cissor preservative configuration and optimization of flowways”. First, to determine whether the available data support the choice, then to calculate the volume of reductive, pressure and plasticization, and finally to discuss the geometry, front-end components and material handling of the screws. If the standard formula is able to cover the window, priority should be given to the standard configuration; and the risk of focal material remaining if sufficient capacity is available but preservation and retention is inappropriate, with a dedicated structure being proposed and increased costs, delivery periods and expected benefits indicated.

If the above-mentioned steps are ignored, the most common consequence is a sufficient capacity, but preservation and inappropriate stay will remain a focus. The problems are often manifested in the trial phase of measuring time instability, insufficient stress residuals, buffer drift, unmelted, black spots, colour differentials or increased wear and tear. Continued increase in temperature, back pressure and turn speed at this time may temporarily improve the appearance, but may increase the shearing heat, material degradation and equipment load.

The focus of the validation was on focus, periodicity and corrosive state. The test shall use the actual material and representative moulds of the client, retaining the batch number, dry condition, ambient temperature and sample number. When compared to old schemes, equipment, moulds and major process conditions other than screws should be as consistent as possible. With the continuous accumulation of project data on tubes and valves, the plant manufacturer could gradually establish a package, a trade package and an aircraft-type menu to allow sales to quickly identify general and special conditions, while at the same time placing a truly complex project under the timely review of the application engineer.