FAQ for Experts. Answers by Experts.

18

How do dry air dryers work?

Interior view of a LUXOR dryer with two desiccant cartridges – the very porous structure (which can have a surface area of up to 1000m² per gram of material) of the molecular sieve can store up to 14% of its mass as water while maintaining a dew point of -20°C.

mo explains the principles behind dry air dryers

Dry air dryers can be categorized as either desiccant dryers or compressed air dryers. Though both designs use dry air, they are each based on different technology. …


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17

What are the key characteristics of a hot-air dryer?

Hot-air dryer LUXOR HD 60

mo explains: possibilities and limitations of hot-air dryers

Hot-air dryers are suited to preheating and drying non-hygroscopic or slightly hygroscopic plastics. These attractively-priced systems use ambient air to dry plastics by carrying the surface moisture away, but without the use of desiccants. …


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16

What types of drying are there?

Drying system with a dryer and two drying bins

mo explains the differences between various drying methods

Plastics are generally dried by the transfer of heat by convection or radiation. Typical convection drying methods include hot-air, dehumidifying, compressed air and vacuum; …


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15

What are the most important parameters for drying plastics?

Four key drying parameters

mo explains the four key drying parameters.

When drying plastics, you should always keep four parameters in mind – and each one has an impact on the other three. …


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14

What is relative and absolute humidity?

Relative and absolute humidity are ways to measure the moisture content of air.

mo explains: Relative and absolute humidity are ways to measure the moisture content of air.

When we read about drying plastics, certain terms come up again and again: …


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13

Why should plastic granules be dried?

By using a suitable dryer, you can ensure defined, consistent moisture levels for your plastics.

mo explains: The moisture content of the feed material has a significant impact on the reliability of processes and the quality of the end product.

When manufacturing plastics, it is essential to ensure that the moisture content of the feed material is just right. …


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12

Dosing technology sum-up

 

This ULTRACOLOR dosing and mixing unit, shown in the medical version, is a gain-in-weight system.

mo explains: There are so many dosing and mixing concepts that it’s easy to get confused. So in this instalment – our last in the dosing technologies series – we’re going to re-visit the most important points. …


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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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