When the project involves biodegradable material, the screw programme must start from the customer ' s real production mission. Vendors of environmentally friendly packaging equipment need to organize water-bearing, heat-sensitive, time spent and number differences into a set of verifiable, calculable and retroactive entry conditions.

Additions and fillings change the demand for currents, frictions, wear, corrosion and mixing. The configuration is not limited to additions, but also focuses on particle form, carrier, fibre length, decomposition products and batch fluctuations; where necessary, the screws, drums, retroring, nozzles and dry delivery systems are evaluated together. 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.

It is recommended that customer information be broken down into five groups: products and moulds, raw materials, platforms, process objectives and existing problems. Product end logs of single weight, flowway, number of caves, wall thickness and appearance levels; ratio of feedstock end recorder number, melting finger, filling, flame retardation and retrofitting; terminal logs of tonnage, voltage, screw diameter, maximum travel, injection pressure and plasticization. All data are sourced and are marked, drawn, physical, measured or estimated by clients. The focus of the discussion here is the difference in water content, heat sensitivity, length of stay and number numbers, which must correspond to the customer ' s current production conditions and not be limited to the maximum values in machine samples.

The implementable options are small-capacity low-deposition configuration and enhanced dry management. The quoted documents should include both the applicable raw materials, the range of recommended voltage, the permitted turn-off and back pressure, the size of the interface, the material and thermal treatment, and the need for re-evaluation when marking subsequent changes to the material or the mould by the client. This would prevent the use of earmarked programmes in completely different conditions.

Special vigilance is needed for the vulnerability to degradation and loss of performance under the traditional generic process. Many of the post-sale disputes arise from inconsistencies between the design input and the actual production conditions, such as the customer ' s replacement of the raw material number, the increase in the return rate or the transfer of the screw to another set of moulds, while still requiring the maintenance of the original acceptance results. The configuration of the boundary and change management should therefore be included in the technical document.

Validation focuses on viscosity, colour and mechanics. 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. 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 freeze of the configuration after the customer has completed the difference between the water rate, the heat sensitivity, the time of stay and the number of the card can reduce the number of wrong orders and facilitate the use of the same version of data after production, testing, installation and sale.