中文午夜乱理片无码,国产午夜精品一区二区三区极品,亚洲日本一区二区三区在线不卡 ,国产乱码日产精品bd,日本无码人妻精品一区二区蜜桃,精品人妻系列无码人妻在线不卡,国产成人精选视频在线观看不卡,午夜男女爽爽爽在线视频
Provide customers with high-quality precision equipment
A high-tech industry integrating R&D, production, sales and service of experimental equipment
What parameters should be considered when selecting a Shanghai Yetuo freeze dryer?
release time:2022-10-17  |  Browse:2530

1. Freeze dried area

The numbers in the model of Yetuo freeze dryer represent the freeze-drying area of that model of freeze dryer. Users should determine the required freeze-drying area based on their own needs through calculation. For example, if each batch of products requires a liquid volume of 1.8 kilograms (liters) to be freeze-dried, and materials are loaded onto material trays with a thickness of 10mm per tray, the load area of the freeze-drying board layer can be calculated as A (area, ㎡)=V (volume, m3)/H (height, m)=0.0018m3/0.01m/0.18 ㎡. Therefore, a freeze-drying machine with a board load area of 0.18 ㎡ needs to be selected.

2. Cold trap temperature

A cold trap is a device used in the freeze-drying process to capture water. In theory, the lower the temperature of the cold trap, the stronger its water capturing ability. However, a low temperature of the cold trap requires high refrigeration requirements, resulting in high machine and operating costs. The cold trap temperature of Shanghai Yetuo freeze-drying machine mainly has several levels such as -60 ℃ and -80 ℃. A freeze dryer with a cold trap temperature of around -60 ℃ is suitable for freeze-drying most products, while a freeze dryer with a cold trap temperature of -80 ℃ is suitable for freeze-drying some special products. The experiment on the effect of cold trap temperature on water capture capacity shows that when the cold trap temperature decreases from -35 ℃ to -55 ℃, the water capture capacity is significantly improved. When the cold trap temperature is below -55 ℃, the water capture capacity of the cold trap is not significantly improved. Therefore, in the absence of special requirements, choosing a cold trap temperature of around -60 ℃ is an ideal choice.

3. Cooling rate

The cooling rate reflects the refrigeration capacity of the refrigeration system. Under no-load conditions, the temperature of the cold trap should reach the minimum temperature specified in the index within 1 hour. For example, for a Yetuo freeze dryer with a cold trap temperature of ≤ -60 ℃, the machine should start timing from the start of refrigeration, and the time for the cold trap temperature to reach -60 ℃ should not exceed 1 hour.

4. Ultimate vacuum degree

The ultimate vacuum degree reflects the leakage situation of the freeze dryer and the pumping efficiency of the vacuum pump. The vacuum degree of the freeze-drying box used to be believed to be better with a higher vacuum degree, but now the view is that the vacuum degree should be within a reasonable range. The vacuum degree is too high, which is not conducive to heat transfer, and the drying speed actually decreases. However, the maximum vacuum degree of the freeze-drying box under no load should reach 2Pa or more.

5. Vacuum extraction time

The empty evacuation speed of the freeze-drying box should reach 2Pa from atmospheric pressure within half an hour.

6. Uniformity and flatness of plate temperature:

The uniformity and flatness of the layer temperature have a significant impact on the uniformity of product quality. The better the temperature uniformity and flatness, the better the uniformity of freeze-dried product quality. The temperature control of the freeze-drying machine shelf includes heater type and intermediate fluid type. The freeze-drying machine shelf with intermediate fluid control plate layer has good temperature uniformity and flatness. This freeze-drying machine plate layer is a hollow sandwich structure, and the cooling and heating of the plate layer are achieved through the circulation of the intermediate fluid in the fluid channel inside the plate layer, so the temperature of the plate layer is uniform and consistent. The shelf temperature control of the bell jar type freeze dryer basically uses heaters, and the consistency of the plate temperature is slightly poor. However, overall, the temperature difference between the layers of pharmaceutical lyophilizers should be controlled within ± 1.5 ℃, and the temperature difference inside the plates should be ± 1 ℃. Food lyophilizers can be appropriately relaxed.

7. Control system

The control system types and functions of Yetuo freeze-drying machines vary. For the experimental series of freeze-drying machines, they are mainly used for exploring the freeze-drying process of materials and small-scale trial production. Therefore, the control system should be able to display real-time freeze-drying process parameters and automatically record them; Set, modify, and effectively execute freeze-drying process procedures; Equipped with communication interfaces for easy data collection and storage.

7585b2b28e16caf6b1d810822a50759.jpg

Previous:Shanghai Yetuo Cover Freeze Drying Machine - Source of Cover Freeze Drying Technology     Next:Basic principle and experiment of lyophilizer
Follow us
Mobile station
  • Mobile:19961895916
  • Tel:19961895916
  • WeChat Account:上海葉拓科技
  • Email:yetuo@sh-yetuo.com
  • Address:C2-301, green window, No. 4, Lvdu Avenue
Copyright? 2025 Shanghai Yetuo Technology Co., Ltd  ICP備案號:滬ICP備20000740號-3 主站蜘蛛池模板: 久久人人爽人人爽久久小说| 成人无码男男gv在线观看网站| 成人性欧美丨区二区三区| 国产无遮挡又黄又爽不要vip网站| 国精品午夜福利视频导航| 亚洲国产精品尤物yw在线| 丝袜自慰一区二区三区 | 亚洲欧美中文日韩v在线97| 一本无码字幕在线少妇| 一本久久a久久免费精品不卡| 无码专区heyzo色欲av| 国语自产视频在线| 天天做av天天爱天天爽| 国产精品呻吟av久久高潮| 久久夜色精品国产噜噜| 色欲色香天天天综合网站| 99久久久无码国产精品免费砚床| 潮喷无码正在播放| 小鲜肉自慰网站| 天天拍天天看天天做| 国产精品日韩av在线播放| 色综合久久综合欧美综合网| 亚洲欧美成人久久综合中文网| 亚洲人成网站在线播放小说| 强被迫伦姧高潮无码bd电影| 免费精品国产人妻国语三上悠亚| 亚洲日韩在线a视频在线观看| 久久无码喷吹高潮播放不卡| 国产精品久久久久不卡无毒| 亚洲人成电影免费观看在线看| 国产亚洲精品久久久久久老妇小说| 国产精品手机免费| 无码日韩av一区二区三区| 欧美成人va免费大片视频| 国产福利视频在线精品| av蓝导航精品导航| 四虎影视国产精品永久在线| 久久久精品94久久精品| 亚洲精品一区二区三区四区久久| 男女18禁啪啪无遮挡| 日本熟妇中文字幕三级|