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Freeze-drying machine knowledge analysis of pre-freezing stage o
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freeze-drying, |
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Food freeze dryers |
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Freeze-drying machine knowledge analysis of pre-freezing stage of freeze-drying technology
The pre-freezing process of the lyophilizer is to solidify the free water in the solution, giving the dry product the same form as before drying, preventing irreversible changes such as foaming, concentration and solute movement during evacuation and drying, and minimizing the substance caused by temperature. Reduced solubility and changes in life characteristics.
There are two pre-freezing methods for the solution: pre-freezing in the freeze-drying tank and pre-freezing in the tank.
The pre-freezing method in the box is to directly place the product on the multi-layer shelf in the lyophilizer, and freeze it by the freezer of the lyophilizer. When a large number of vials and ampoules are lyophilized, it is convenient for entering and unpacking. Generally, the vials or ampoules are placed in several metal trays and then placed in the box to improve heat transfer. Some metal discs can be made into a movable bottom type. When entering the box, the bottom is pumped away, so that the vial is directly in contact with the metal plate of the freeze-drying box; for the non-priming plate, the bottom of the plate is required to be flat to obtain uniformity of the product. The large plasma bottle using the spin-drying method should be frozen beforehand and then added to the metal frame for heat conduction before being frozen into the box.
There are two methods for pre-freezing outside the box. Some small freeze dryers do not have a pre-frozen product and can only be pre-frozen using a low temperature refrigerator or alcohol plus dry ice. The other is a dedicated chiller that freezes the product of the large bottle into a shell-like structure and then into the lyophilization box.
Freeze dryer pre-freezing process:
When the temperature of the aqueous solution drops to a certain level, according to the eutectic concentration of the solution, the concentration begins to freeze in the light solution |
| Company: |
Beijing Songyuan Huaxing Technology Development Co., Ltd.
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| Contact: |
Mr. tingting cheng |
| Address: |
Room 706 Tower C, Changyin Building |
| Postcode: |
100000 |
| Tel: |
01058895377 |
| Fax: |
01058895377 |
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