FAQ for Experts. Answers by Experts.
68
What are the criteria for choosing a dosing screw?
Mo explains specific aspects of dosing
Choosing the correct doing screw is the key to precise dosing. The dosing screw’s job is to transport bulk material evenly and consistently. …
67
What is the purpose of dosing systems with flexible bins?
Mo explains specific aspects of dosing
The dosing of bulk material with bad flow properties can be very difficult and problematic. …
66
What is the purpose of a level control in the collection bin for loss-in-weight systems?
Mo explains specific aspects of dosing
There are two customary methods of adjusting the throughput of the dosing system to the throughput of the extruder. …
65
Why does a loss-in-weight system need seperate refilling?
Mo explains specific aspects of dosing
Differential dosing scales are gravimetric removal scales (loss-in-weight doseres), that measure the weight loss of the dosing station continuously. …
64
How does the resolution of a load cell influence dosing accuracy?
Mo explains specific aspects of dosing
The load cells of gravimetric dosing systems need to master a balancing act – on the one hand they need to measure large throughput rates of up to multiple tons an hour, while on the other be able to measure extremely small amounts of a few hundred grams an hour precisely. …
63
How does the dosing order affect the dosing results with a gain-in-weight dosing system?
Mo explains specific aspects of dosing
First a quick reminder: with gain-in-weight dosing systems the components are dosed separately, one after the other – in batches or asynchronously – into the weigh bin where the weight increase in the bin is measured. …
62
What needs to be considered when dosing very small amounts?
Mo explains specific aspects of dosing
Throughput does not equal throughput – the motto of the previous issue of mo’s corner where we looked at the maximum throughput of a dosing unit, also applies when dosing very small amounts, such as when dosing colour Masterbatch. …
61
What needs to be considered when designing dosing systems?
Mo explains specific aspects of dosing
Throughput is not equal throughput – this is especially true for throughput details of injection moulding machines. …
60
How does a crystalliser work?
Mo explains specific aspects of drying
Whether crystallising virgin material or regrind, it is a challenging process technology with a few specifics that need to be considered. …
59
Why and when is a crystalliser needed?
Mo explains why some plastics need to be crystallised before drying
Plastics such as PET (Polyethylenterephtalate), PEN (Polyethylennaphthalate) or PLA (Polylactic Acid) can’t be sufficiently processed unless they have been dried prior to processing. …