CN1280287A - Method for determining terminial point of vacuum freeze drying process - Google Patents
Method for determining terminial point of vacuum freeze drying process Download PDFInfo
- Publication number
- CN1280287A CN1280287A CN 00106019 CN00106019A CN1280287A CN 1280287 A CN1280287 A CN 1280287A CN 00106019 CN00106019 CN 00106019 CN 00106019 A CN00106019 A CN 00106019A CN 1280287 A CN1280287 A CN 1280287A
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- Prior art keywords
- vacuum freeze
- freeze drying
- main valve
- drying
- drying process
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- Drying Of Solid Materials (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
Abstract
When the vacuum freeze drying process nears its terminal point, the main valve is shut off for several seconds and the change speed of pressure inside the box is calculated manually or by control system. If the change speed reaches the required drying standard, the vacuum freeze drying process is judged to be completed, or else the material has still excessive moisture content and needs further drying by opening the main valve. The method makes it possible to determine whether the terminal point of vacuum freeze drying process is reached or not without opening the box, and this results in high product yield and finished rate.
Description
The present invention relates to a kind of method of judging terminial point of vacuum freeze drying process.
Whether the material that is dried has reached the drying program of expection in vacuum freeze drier, be puzzlement operator and vacuum freeze drier producer's a difficult problem always.Generally be the vacuum freeze drying process through after a while, the material that is dried is taken out detection in vacuum freeze drier, if reached the dry standard of goods regulations, then this vacuum freeze-drying technique process can finish; Otherwise the water capacity of material exceeds standard, and then the material that is dried is put back in the vacuum freeze drier, continues vacuum freeze drying a period of time; Repeat to do above-mentioned test, up to the dry standard that has reached the goods regulations, then this vacuum freeze-drying technique process can finish.
Therefore, the traditional handicraft complexity is loaded down with trivial details, and causes material to pollute easily.
The purpose of this invention is to provide a kind ofly under the condition that vacuum freeze drier is not unpacked, just can judge the vacuum freeze drying terminal point and improve the yield of goods and the method for the judgement terminial point of vacuum freeze drying process of qualification rate.
For achieving the above object, the present invention takes following design: a kind of method of judging terminial point of vacuum freeze drying process, it uses vacuum freezing drying oven and cold-trap split, by the vacuum freeze drier of main valve isolation, in the vacuum freeze drying process during near terminal point, close the main valve several seconds, by the case internal pressure pace of change during artificial or the control system calculating pass valve, if this pace of change has reached the dry standard of goods regulations, judge that then this vacuum freeze-drying technique process can finish; Otherwise if the case internal pressure changes too greatly, then the water capacity of material exceeds standard, and can open main valve, continues vacuum freeze drying a period of time; Repeat to do above-mentioned test,, judge that then this vacuum freeze-drying technique process can finish up to the dry standard that has reached the goods regulations.
The present invention utilizes the water capacity difference of material, and the moisture content that its unit interval distilled out will have to be had less more.At this moment, if close main valve, the pressure (being lower than atmospheric pressure) in the vacuum freezing drying oven will have rising in various degree.If the material water capacity is big, case internal pressure lift-off value is then big in the unit interval; Otherwise the pressure lift-off value is then low.
Based on above-mentioned principle, in the vacuum freeze drying process during near terminal point, close the main valve several seconds, by the case internal pressure pace of change during artificial or the control system calculating pass valve, if this pace of change has reached the dry standard of goods regulations, judge that then this vacuum freeze-drying technique process can finish; Otherwise if the case internal pressure changes too greatly, then the water capacity of material exceeds standard, and can open main valve, continues vacuum freeze drying a period of time.Repeat above-mentioned said process,, judge that then this vacuum freeze-drying technique process can finish up to the dry standard that has reached the goods regulations.
This method just can be judged the vacuum freeze drying terminal point under the condition that vacuum freeze drier is not unpacked, improved the yield and the qualification rate of goods greatly.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 uses the vacuum freezing drying oven structural representation for the present invention
A kind of method of judging terminial point of vacuum freeze drying process of the present invention, it uses vacuum freezing drying oven 1 and cold-trap 2 splits, vacuum freeze drier by main valve 3 isolation, in the vacuum freeze drying process during near terminal point, close 3 several seconds of main valve, by the case internal pressure pace of change during artificial or the control system calculating pass valve,, judge that then this vacuum freeze-drying technique process can finish if this pace of change has reached the dry standard of goods regulations; Otherwise if the case internal pressure changes too greatly, then the water capacity of material exceeds standard, and can open main valve 3, continues vacuum freeze drying a period of time; Repeat said process,, judge that then this vacuum freeze-drying technique process can finish up to the dry standard that has reached the goods regulations.
Claims (1)
1, a kind of method of judging terminial point of vacuum freeze drying process, it is characterized in that: use vacuum freezing drying oven and cold-trap split, by the vacuum freeze drier of automatically controlled main valve isolation, in the vacuum freeze drying process during near terminal point, close the main valve several seconds, by the case internal pressure pace of change during artificial or the control system calculating pass valve, if this pace of change has reached the dry standard of goods regulations, judge that then this vacuum freeze-drying technique process can finish; Otherwise if the case internal pressure changes too greatly, then the water capacity of material exceeds standard, and can open main valve, continues vacuum freeze drying a period of time; Repeat said process,, judge that then this vacuum freeze-drying technique process can finish up to the dry standard that has reached the goods regulations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00106019 CN1280287A (en) | 2000-04-11 | 2000-04-11 | Method for determining terminial point of vacuum freeze drying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00106019 CN1280287A (en) | 2000-04-11 | 2000-04-11 | Method for determining terminial point of vacuum freeze drying process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1280287A true CN1280287A (en) | 2001-01-17 |
Family
ID=4578087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00106019 Pending CN1280287A (en) | 2000-04-11 | 2000-04-11 | Method for determining terminial point of vacuum freeze drying process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1280287A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764697A (en) * | 2015-04-16 | 2015-07-08 | 浙江工商大学 | Method for judging vacuum freeze-drying degree of shrimp meat |
| CN106853417A (en) * | 2016-11-18 | 2017-06-16 | 中核兰州铀浓缩有限公司 | Centrifugation cascade a small amount of centrifuge shelves vacuum drying method |
| CN108294219A (en) * | 2018-01-23 | 2018-07-20 | 青岛博瑞设备制造有限公司 | A kind of food freeze dryer and its lyophilized technique |
| CN115790081A (en) * | 2022-11-17 | 2023-03-14 | 兰钧新能源科技有限公司 | Vacuum baking device and method for lithium battery |
-
2000
- 2000-04-11 CN CN 00106019 patent/CN1280287A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764697A (en) * | 2015-04-16 | 2015-07-08 | 浙江工商大学 | Method for judging vacuum freeze-drying degree of shrimp meat |
| CN106853417A (en) * | 2016-11-18 | 2017-06-16 | 中核兰州铀浓缩有限公司 | Centrifugation cascade a small amount of centrifuge shelves vacuum drying method |
| CN106853417B (en) * | 2016-11-18 | 2019-02-26 | 中核兰州铀浓缩有限公司 | Centrifugation cascades a small amount of centrifuges and shelves vacuum drying method |
| CN108294219A (en) * | 2018-01-23 | 2018-07-20 | 青岛博瑞设备制造有限公司 | A kind of food freeze dryer and its lyophilized technique |
| CN115790081A (en) * | 2022-11-17 | 2023-03-14 | 兰钧新能源科技有限公司 | Vacuum baking device and method for lithium battery |
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| Date | Code | Title | Description |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |