Drying

FAQ for Experts. Answers by Experts.

22

How does drying work?

Moisture content in g/m³ at various dew-points

mo explains the physics of drying

Drying material means removing its moisture, which sounds very simplistic. The first method that comes to mind is to use the highest possible drying temperature to dry the material rapidly. …


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21

How does the dew-point impact plastic granulate drying?

Moisture content [g] in m³ air at various dew-point temperatures.

mo explains the correlation between dew-point and (residual) moisture

To recap, there are four key parameters involved in drying plastic granulate: drying temperature, air-flow, dew-point temperature and the drying time. …


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20

What other drying options are there?

Blanketing bins keep granulate dry

mo explains: drying cabinets, blanketing bins, infrared dryers, and vacuum dryers

As is the case with many fields of industry, when it comes to drying plastics, there are common, and less common, technologies. …


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19

How do compressed-air dryers work?

Compressed-air dryers do not require desiccants, and are especially suited to drying small quantities of granulate. Pictured: a compressed air micro dryer, type LUXOR CAS with double-glazed drying hopper.

mo explains: compressed-air dryers are suited to drying small quantities of granulate

Compressed-air dryers fall under the category of dry air dryers. They use compressed air, expanded to atmospheric pressure, creating dry process air with a low dew point. …


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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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