Drying

FAQ for Experts. Answers by Experts.

50

What is the purpose of molecular sieves?

What is the purpose of molecular sieves?

The heated air in the regeneration heater (1) is fed through the bed and cooled. (2) heat exchanger (3) cooler

Mo explains specific aspects of drying

  …


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22

How does drying work?

Moisture content in g/m³ at various dew-points

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. …


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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.

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: …


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20

What other drying options are there?

Blanketing bins keep granulate dry

Blanketing bins keep granulate dry (photo: motan)

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.

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. …


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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.

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. …


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17

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

Hot-air dryer LUXOR HD 60

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. …


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16

What types of drying are there?

Drying system with a dryer and two drying bins

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. …


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15

What are the most important parameters for drying plastics?

Four key drying parameters

Image: Sven Hasselbach Photography

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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