Freeze Dryers - Revision history

Helal at 13:43, 4 August 2012

2012-08-04T13:43:35Z

← Older revision		Revision as of 07:43, 4 August 2012
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	==~~'''~~Why Freeze Dryers are required?~~'''~~==		==Why Freeze Dryers are required?==
	Until now most of the freeze dryers are of the Tray Dryer type. Despite the optimal structure of the individual product particles the product layer on the plates will usually form one piece of hard baked material. Often the product has to be crushed after freeze drying, which may lead to damage of the product structure. Another disadvantage is the relatively low heat transfer rate due to the dead state of the material on the plates. Also the handling of the product is quite labor intensive because the trays have to be filled and discharged manually. In this context active freezing came into existent. For this active freezing process a special kind of dryers were emerged named Freeze Dryers.		Until now most of the freeze dryers are of the Tray Dryer type. Despite the optimal structure of the individual product particles the product layer on the plates will usually form one piece of hard baked material. Often the product has to be crushed after freeze drying, which may lead to damage of the product structure. Another disadvantage is the relatively low heat transfer rate due to the dead state of the material on the plates. Also the handling of the product is quite labor intensive because the trays have to be filled and discharged manually. In this context active freezing came into existent. For this active freezing process a special kind of dryers were emerged named Freeze Dryers.


	==~~'''~~Advantages~~'''~~==		==Advantages==
	* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.		* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.
	* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.		* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.
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	==~~'''~~Typical Applications~~'''~~==		==Typical Applications==
	* Temperature sensitive materials		* Temperature sensitive materials
	* Delicate structured materials		* Delicate structured materials

Helal at 07:49, 2 August 2012

2012-08-02T07:49:30Z

← Older revision		Revision as of 01:49, 2 August 2012
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	==='''Why Freeze Dryers are required?'''===		=='''Why Freeze Dryers are required?'''==
	Until now most of the freeze dryers are of the Tray Dryer type. Despite the optimal structure of the individual product particles the product layer on the plates will usually form one piece of hard baked material. Often the product has to be crushed after freeze drying, which may lead to damage of the product structure. Another disadvantage is the relatively low heat transfer rate due to the dead state of the material on the plates. Also the handling of the product is quite labor intensive because the trays have to be filled and discharged manually. In this context active freezing came into existent. For this active freezing process a special kind of dryers were emerged named Freeze Dryers.		Until now most of the freeze dryers are of the Tray Dryer type. Despite the optimal structure of the individual product particles the product layer on the plates will usually form one piece of hard baked material. Often the product has to be crushed after freeze drying, which may lead to damage of the product structure. Another disadvantage is the relatively low heat transfer rate due to the dead state of the material on the plates. Also the handling of the product is quite labor intensive because the trays have to be filled and discharged manually. In this context active freezing came into existent. For this active freezing process a special kind of dryers were emerged named Freeze Dryers.


	==='''Advantages'''===		=='''Advantages'''==
	* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.		* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.
	* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.		* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.
Line 23:		Line 23:


	==='''Typical Applications'''===		=='''Typical Applications'''==
	* Temperature sensitive materials		* Temperature sensitive materials
	* Delicate structured materials		* Delicate structured materials

Helal at 15:16, 1 August 2012

2012-08-01T15:16:27Z

← Older revision		Revision as of 09:16, 1 August 2012
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	==='''Advantages'''===		==='''Advantages'''===
	* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.		* Freeze Dryer enables to produce at low temperature and low pressure a lump-free, free-flowing, freeze dried product.


	* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.		* The Freeze Dryer also has a better heat transfer rate due to the continuous mixing of the product, resulting in shortening the drying process.


	* The freezing dryer follows such a freezing step that is simplified because it can be done in the same vessel instead of having a separate freezing unit, which results in easy handling of the product compared to it's predecessor tray dryer equipment.		* The freezing dryer follows such a freezing step that is simplified because it can be done in the same vessel instead of having a separate freezing unit, which results in easy handling of the product compared to it's predecessor tray dryer equipment.


	* The Freeze Dryer can also be used in continuous operation.		* The Freeze Dryer can also be used in continuous operation.


	* Since the dried product is released from the frozen material during the drying process, these dry particles can be collected separate from the actual dryer.		* Since the dried product is released from the frozen material during the drying process, these dry particles can be collected separate from the actual dryer.

Helal at 13:24, 1 August 2012

2012-08-01T13:24:44Z

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+[[File:Freeze_Dryers.jpg|thumb|200px|right|Freeze Dryers]]

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