When the project involves a double-coloured retrofit, the screwdriver programme must start from the customer ' s real production mission. The dual-colour machine manufacturer needs to organize the main side-jet material, the amount of glue, the colour switch and the temperature window into a set of verifiable, calculable and retroactive input conditions.

The platform parameters are understood separately. Locked-molecular tonnage addresses the pressure of the mould, and the reductive units address the problems of molten volume, pressure, velocity and plasticity, which cannot be replaced by one number. The salesman shall be based on the machine sign, the injection unit specification form and the actual course of the controller, and shall fix the nominal gel mass with the material density. 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.

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 the main side-jet material, the amount of voltage, the colour switch and the temperature window, which must correspond to the customer ' s current production conditions and not be limited to the maximum values in machine samples.

The project advance may be accompanied by a separate calculation of each material and the needs of each shot, and an evaluation of the sale, 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.

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 use of the same specifications around the two sets would result in the creation of a preventive measure that would be too large or mixed, more economical than the re-routing of the machine after the problem; the vendor could then move from a mere offerer to a partner capable of carrying the technical screening.

Upon completion of the project, a two-colour interface, weight and colour-replacement efficiency were used as the delivery conclusion, and size tests, material or heat treatment certificates, trial modelling records and maintenance recommendations were archived. Sales teams can return after three months or a ton agreement to compare plasticization time, energy consumption, product fluctuations and wear and tear trends. For aluminum manufacturers and vendors, professionalism is reflected in the ability to translate the client language into engineering parameters and to interpret the programme into production, quality, maintenance and cost results that the client can understand. The creation of a standard process around a two-coloured retrofit not only improves the accuracy of this selection but also creates a reusable machine and application database.