Without a powder dosing system installed in your dispensing operations, several common issues prop up. Some of these problems existed pre-automated powder dosing technologies, while others have emerged as a result of your workforce having been acclimatised to dosing technologies.
Excessive powder flow
One sensation that can cause unbelievable observations is the potential modification in loose mass density and flowability that can happen to a powder. After pneumatic transport and reception in a bin, some powders can come to be aerated. During dosing, the solids activity can allow the air to leave the powder. If the powder was very aerated, after that a noticeable fluidization can happen at the base of the receptacle and dramatically enhance the circulation of powder via the dispensing equipment, which results in uncontrolled dispensing. This is an apparent concern because the dosing can not be predictable, leading to irregular dosing outcomes. Additionally, due to the fact that the level of aeration depends on the period the powder has been in the upstream receptacle, this result can occur while the plant remains in full manufacturing, but not at start-up or at sluggish assessor rates.
It is needed to deal with the origin and layout or control the supply of product in a different way– for instance, more time in between refill of powder and dispensing or vibration to enable compaction of the powder– or apply some modifications in the layout of the dosing tool– for example, smaller clearances, different screw pitch, different kind of augers, etc.
Inaccurate load cells reading
To obtain a proper dosing, the load cells reporting need to be reliable. It must be understood by manufacturing facility teams that load cells will usually reveal a reading, however erroneous. If the analysis is trusted without verification, large blunders, which can only be seen really late (typically when the product is already loaded), can occur and cause losses or perhaps item recall.
Operators should, therefore, be proactive in conducting a routine test of the load cells and ensuring that the load cells are effectively shielded from any perturbations. These checks will enable detection of mistakes early and a chance to correct them prior to they result in big repercussions.
Outside disruptions that can affect the analysis of load cells have different beginnings. Key reasons are listed below, from many potential to least likely. Such lists can easily be converted into a repairing list for operation or commissioning staff:
- Inappropriate installing of adaptable links.
- Mounting of utilities connections with stress (electric cable televisions, compressed air cables, and so on).
- External vibration during dispensing (specifically for precision dosing).
- Air draft during dosing (especially for fine dispensing).
- Poor mounting (hopper in contact with static.
- component like wire tray or system).
- Electronic signal disturbance.
- Breakdown of the load cells (out of calibration).