[Scene definition] How to judge a screw selection when a black spot is frequently present in a product is based on the actual production scene of the plant, and not only on the diameter or price of the screw. It is recommended that the frequency of defects, time periods and changes in process parameters be first collated and then that a uniform sampling method be used for the same product on different platforms to facilitate horizontal comparisons. The aim of this step is to establish comparable old programme benchmarks so that subsequent screw changes can be supported by data.

The most easy to ignore on this topic is the boundaries of screws, cylinders, reversible rings and molds. Plants should divide needs such as appearance, size, strength and odor into necessary and optimized items and break daily production down into class beats, time available and loss of modelling. Vendors can make retroactive trade-offs between interoperability, earmarking and cost when there are clear values for product weight, daily production, customer quality caps and allowed stop times.

The main line of the case [design focus] is to pre-empt the causes of drying, temperature control and molds with evidence. In geometry and materials programmes, the retrofitting, reflowing and screwhead residual areas should be checked for color change and refuelling; and screw diameter, effective itinerary and single-mode mass should be calibrated together to prevent long stops. The final solution would also need to be compatible with the wear and tear of the cylinder, the drive, the physical velocity and the current cleaning process, and would not cover up co-operation or process problems with a single high-level material.

The new [comparison-valid] program proposes a minimum of 48 hours of continuous operation, with a 100-mode extraction for each stabilization phase, and records the screw-back load, back pressure stability and daily production. A planned refuelling test should be added to the test to check the consumption of residues, black spots and cleaning materials, and also to retain a matrix, a stable and a long run sample group for comparison purposes. If only the first one is checked, it is easy to miss the risks associated with heat drifting, material stoppage, reversal loop return and prolonged wear and tear.

When the [stabilized production] spiral is shaped, it should provide for cold-activated temperature protection time and allow twirl, avoid cold-temperature forced storage, establish a metallic alien separation and magnetic insulation system and check for prune damage after abnormality. The time of storage, back pressure, screw velocity, noise and mass of the product shall be recorded in a uniform manner in the shift. When the above indicators change at the same time, the mechanical gaps and the state of the raw materials should be checked before the process is adjusted to avoid the use of parameters to compensate for hardware degradation.

The cost statement [comprehensive cost] cannot simply be a screw price, and the planned stoppage should be priced separately from the unplanned stoppage, which would also include the loss of late delivery, and a minimum production threshold for the dedicated screw, re-comparisoning the generic formula when production is insufficient. It is recommended that the cost per 10,000 eligible items be exported simultaneously, the cost per 1,000 operating hours and the estimated number of return months. When new programmes reduce waste, refuelling or sudden shutdowns, higher initial inputs are often offset during production.

The [Closed Ring Management] will eventually include drawing numbers, screwdriver materials, heat treatment, critical dimensions, portable tubes, process windows and acceptance data in the curriculum vitae cards. It is recommended that the process setting values be recorded separately from the actual on-board values to facilitate the detection of control deviations, while combining cleaning, measuring, photographing and sampling in shut-down windows to reduce double-down. When there is a significant change in the feedstock formulation, retrospective ratio, product structure or target node, the applicable boundary of “how to judge a screw selection when products are frequently blacked out” should be reassessed rather than defaulting that the old conclusion is permanent.

Topic: Quality diagnosis and selection