Dosing & mixing

FAQ for Experts. Answers by Experts.

11

Is there a hard and fast definition of dosing accuracy?

Translucent injection-moulded components call for very high dosing accuracy. This makes disc dosing a good choice for this application.

mo explains: “Dosing accuracy” can be defined in many ways, depending on the application.

Generally, the term “dosing accuracy” is used to describe how accurately a dosing unit achieves the target mass or volume. …


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10

Why do we mix materials when dosing? And what should we keep in mind?

Gravity mixing

mo explains: Separately dosed materials need to be correctly mixed to ensure that plasticisation results in a homogenous output material.

The purpose of dosing and mixing is to combine multiple materials in the right ratio. …


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09

How do “loss-in-weight” dosing systems work?

mo explains: In the context of continuous gravimetric dosing, “loss-in-weight” systems work by weighing the entire dosing module – the dosing hopper and its contents, the dosing device and drive unit – and measuring the decrease in mass as the material is metered. …


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08

What is the “gain-in-weight” Method in the context of gravimetric asynchronous dosing?

GRAVICOLOR gravimetric dosing stations can dose and mix up to six ingredients, depending on the design. The control unit compares the mass that has already been metered with the defined target mass.

mo explains: Gravimetric asynchronous dosing stations meter the components of a mixture into a weighing chamber one after another. As each ingredient is added, the system measures the aggregate mass of all ingredients – a method described as “gain-in-weight”. …


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07

How do volumetric synchronous dosing units work?

A dosing and mixing unit for one main ingredient and one auxiliary ingredient

mo explains: Synchronous dosing stations meter all components simultaneously. The mass flow corresponds to the recipe at all times, and there is no need to actively blend the ingredients using a downstream mixer. …


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06

How do asynchronous dosing systems work?

With asynchronous dosing a mixer is required.

mo explains: With asynchronous dosing the individual material components of a recipe are dosed in portions independently from the processing machine cycle, therefore an additional mixing device is required. …


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05

Why do volumetric dosing units need calibrating?

Modern dosing unit in normal “closed” position

mo explains: In volumetric dosing, the output is not weighed – which is why it is important to establish a link between the volume of material being dosed by the unit and the actual mass of material. …


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04

How do various types of dosing device work (2)?

The choice of dosing device depends on which materials and method you are using, and what throughput you require.

mo explains: The choice of dosing device depends on which materials and method you are using, and what throughput you require.

In the last article (3), we talked about dosing screws and cone valves. …


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03

How do the various types of dosing devices work (1)?

The choice of dosing devices depends on which materials and method you are using, and what throughput you require.

mo explains: The choice of dosing devices depends on which materials and method you are using, and what throughput you require.

To choose the right dosing device for your application, you need to consider three key points: …


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02

What is the difference between volumetric and gravimetric dosing?

A volumetric system doses material according to the space it occupies i.e. its volume; a gravimetric system determines the amount of material to be dosed by weight.

mo explains: A volumetric system doses material according to the space it occupies i.e. its volume; a gravimetric system determines the amount of material to be dosed by weight. …


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