FAQ for Experts. Answers by Experts.

68

What are the criteria for choosing a dosing screw?

Variedad de husillos: la elección correcta del husillo de dosificación es la clave para una dosificación precisa (Imagen: Motan-Colortronic)

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. …


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67

What is the purpose of dosing systems with flexible bins?

The flexible material bin can be changed in no time at all (image: Motan-Colortronic)

Mo explains specific aspects of dosing

 

The dosing of bulk material with bad flow properties can be very difficult and problematic. …


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66

What is the purpose of a level control in the collection bin for loss-in-weight systems?

With level control a specified fill level of the collection bin can be set. For this, the load cell (red) continuously monitors the content. (Image: Motan-Colortronic)

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. …


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65

Why does a loss-in-weight system need seperate refilling?

On the left a material loader installed on a refilling hopper. On the right and in the middle material loaders with controlled outlet flaps for direct refilling (image: Motan-Colortronic)

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. …


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64

How does the resolution of a load cell influence dosing accuracy?

Modern load cells are available with different resolutions and maximum loads depending on the demands (image: Motan-Colortronic)

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. …


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63

How does the dosing order affect the dosing results with a gain-in-weight dosing system?

When dosing a very fine, free-flowing component it can be helpful to dose the coarser component first (image: Motan-Colortronic)

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. …


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62

What needs to be considered when dosing very small amounts?

 

When dosing very small amounts every individual granule is important (image: Motan-Colortronic)

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. …


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61

What needs to be considered when designing dosing systems?

Simplified time flow of a cycle with tool closing (1), injection unit moves forward (2) , injection (3), holding pressure (4), plastification (5), material intake (6), injection unit moves back (7), cooling (8) and tool opening (9) (image: Motan-Colortronic)

Mo explains specific aspects of dosing

 

Throughput is not equal throughput – this is especially true for throughput details of injection moulding machines. …


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60

How does a crystalliser work?

 

A look inside the agitator bin – the agitator and lateral stators can be seen clearly

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. …


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59

Why and when is a crystalliser needed?

A fixed bed crystalliser directs a heated air flow through an agitator bin in a defined process to achieve the necessary degree of crystallisation.

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. …


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