When the project involves process window validation, the screw programme must start from the customer ' s real production task. Application engineers are required to organize temperature, rotation, back pressure, radio speed and material fluctuations into a set of verifiable, calculable and retroactive input conditions.

The effectiveness of the programme needs to be verified with the same materials, moulds and test methods. In addition to size and material reports, time measurement, buffer position, pressure curve, temperature, product weight, appearance and periodicity should also be recorded, with clear acceptance windows. Data-based delivery reduces disputes and facilitates subsequent replication. 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.

Calculates the nominal value to be converted to the actual condition. The machine often uses PS as a reference for the gel weight, which should be revised by density when using other raw materials; the weight of the product should be added to the main course, traffic separation and a reasonable buffer. The larger the diameter of the screw, the greater the theoretical capacity, but the pressure of injections per unit area under the same hydraulic pressure or servo system will decline and the resolution of the measurement of the small amount of the aerosol may also be variable. The focus of the discussion here is on temperature, rotation, back pressure, radio speed and material fluctuations, which must correspond to the customer ' s current production conditions and not be limited to the maximum values in machine samples.

From a sales management perspective, high- and low-border combinations should be designed and response recorded to form a standard process that can be used again. Each project saves original needs, computations, final drawings, test modelling data and client feedback, and can call on experience in the event of a similar machine or material, but there is still a need to reconcile key differences and not to copy the historical configuration directly.

The main risk of the scene is that the success of a single parameter point does not represent a stable yield. The issue of whether or not to be derived from a screw should first be excluded from drying, heating ring, thermal voltage, nozzles, reversible rings, wear and tearing of the material drums and changes in process parameters. The use of exclusions is more reliable than the direct replacement of components and also protects the time and cost of both the seller and the client.

At the time of acceptance, it is recommended that the main indicator be the width and weight of the eligible window, Cpk, and that the temperature of the drums be synchronized with that of the spiral, back pressure, measurement position, buffer position, injection peak pressure and continuous sample weight. At least three reasonable process points, low, medium and high, are covered to confirm that the programme is not effective under a single parameter. Therefore, the process window certification should not follow the simple logic of “system-system”. Only by accounting for products, feedstocks, tonnages, voltage, screw diameter and target cycles will the standard screws have a clear scope of application and the dedicated screws have a reasonable design basis and return on investment.