In the drive-and-reverse core, the first solution to be addressed by the equipment retrofitter is not to select a ready-to-use model, but to confirm the electric power, the speed-reducing box, the allowed back pressure, the turn speed and the material load. This step determines whether the subsequent spiral diameter, structure and material grade are well founded.

Old machine upgrades are the easiest to ignore system matching. New screws must be compatible with the needs of old drums, drives, brakes, heating, nozzles, control of travel and molds. Any build-up, speed-up or material upgrade should first measure the status quo, then determine whether the single replacement, plasticization component upgrade or the full retrojection of the unit. 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.

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 the discussion here is on electrics, speed-reducing boxes, permitted back pressure, speed-rotation and material loads, which must correspond to the customer ' s current production conditions and not be limited to the maximum values in machine samples.

The project may be advanced on the basis of a continuous and peak-twirl estimate, with an evaluation of sales, design, process and customer participation. 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.

If the above-mentioned steps are ignored, the most common consequence is that the need for a rearranger after a structural upgrade may exceed the capacity of the old machine. 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.

Ultimately, the programme should be judged by currents, twisting alarms and plasticization times. If the result fails to meet the standard, each adjustment and result shall be recorded in five directions, by raw material, equipment, molds, process and screw, so as to avoid the loss of causal judgement by modifying multiple parameters at the same time. Where the information is temporarily incomplete, the pre-selection scope and the list to be confirmed may be provided, but it should not be considered a final commitment. The freezing of configurations after the customer fills up the electrics, speed-reducing boxes, allows back pressure, turns and loads of materials can reduce erroneous orders and facilitate the production, testing, installation and sale of the same version of data.