CN204666473U - Testing vapor transmission instrument - Google Patents
Testing vapor transmission instrument Download PDFInfo
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- CN204666473U CN204666473U CN201520291602.7U CN201520291602U CN204666473U CN 204666473 U CN204666473 U CN 204666473U CN 201520291602 U CN201520291602 U CN 201520291602U CN 204666473 U CN204666473 U CN 204666473U
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- vapor transmission
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Abstract
The utility model relates to a kind of testing vapor transmission instrument, comprise casing, described casing is provided with test platform, described test platform comprises substrate, described substrate is provided with test container, described test container is used for fixing test sample, and by described test sample book, described test container is divided into separate humidifier body cavity and dry gas body cavity; Described casing is also provided with the humidified gases draft tube and humidified gases escape pipe that are communicated with described humidifier body cavity, and the dry gas draft tube be communicated with described dry gas body cavity and dry gas escape pipe; Described dry gas draft tube is provided with mass flow controller, drying tube, and is connected with high pure nitrogen source of the gas, and described dry gas escape pipe is provided with moisture sensor and retaining valve; Described humidified gases draft tube is provided with mass flow controller, humidity generator.The testing vapor transmission instrument that the utility model provides, in the circulation authenticity of environmental simulation and the broadness of measurement range, has filled up technological gap.
Description
Technical field
The utility model relates to a kind of testing vapor transmission instrument.
Background technology
Food and medicine are the healthy closely bound up commodity with people, the packaging of these type of commodity not only requires that good looking appearance is pleasant, convenient and practical, the more important thing is and guarantee that content has stable, reliable quality in shelf life, prevent the decomposition caused due to the moisture absorption, gas leakage and illumination from going bad.Therefore, the packaging with barrier function is selected to be the key ensureing food and drug safety.
The barrier of wrappage is for specific permeable object, permeable object comprises common gas, water vapour, liquid, organism etc., refers to that material is penetrated through the barrier property arriving opposite side (being generally penetrate through material by high concentration side to enter low concentration side) by its side to specific permeable object.Narrow sense, comprise oxygen-barrier property and water vapor barrier.Because the fat in food and protein, effective constituent in medicine is easily hydrolyzed under water vapour existence condition, variable color, rotten, even produce toxicity, so have very important significance for the detection of food and drug packing material steam breathability.
Utility model content
Primary and foremost purpose of the present utility model is to provide a kind of testing vapor transmission instrument, and concrete scheme of the present utility model is as follows for achieving the above object:
A kind of testing vapor transmission instrument, comprise casing, described casing is provided with test platform, described test platform comprises substrate, described substrate is provided with test container, described test container is used for fixing test sample, and by described test sample book, described test container is divided into separate humidifier body cavity and dry gas body cavity;
Described casing is also provided with the humidified gases draft tube and humidified gases escape pipe that are communicated with described humidifier body cavity, and the dry gas draft tube be communicated with described dry gas body cavity and dry gas escape pipe;
Described dry gas draft tube is provided with mass flow controller, drying tube, and is connected with high pure nitrogen source of the gas, and described dry gas escape pipe is provided with moisture sensor and retaining valve;
Described humidified gases draft tube is provided with mass flow controller, humidity generator.
Preferably, described high pure nitrogen source of the gas is connected successively with described drying tube, the first two position two-way valve, four-way connection, an output terminal of described four-way connection is connected with nitrogen gas recovering apparatus, another two output terminals are connected to described mass flow controller, and two described mass flow controllers are connected to the both sides of described dry gas body cavity.
Preferably, described dry gas body cavity is made up of two cavitys be communicated with, and one of them cavity is provided with condensation-water drain.
Preferably, the output terminal of described nitrogen gas recovering apparatus is connected with the mass flow controller of described humidified gases draft tube, the output terminal of described mass flow controller is connected with the first two position three-way valve, an output terminal of described first two position three-way valve is connected with the first three-way connection, an output terminal of described first three-way connection is connected to moisture variable valve, another output terminal is connected to dry gas variable valve, described moisture variable valve and described dry gas variable valve are all connected to the second three-way connection, the output terminal of described second three-way connection is connected to the second two position three-way valve by humidity generator, another input end of described second two position three-way valve is connected with another output terminal of described first two position three-way valve, the output terminal of described second two position three-way valve is connected to humidifier body cavity.
Preferably, described moisture sensor both sides are respectively equipped with retaining valve.
Preferably, also attemperating unit is provided with below described test container.
The testing vapor transmission instrument that the utility model provides, in the circulation authenticity of environmental simulation and the broadness of measurement range, has filled up technological gap.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a application's part, does not form improper restriction of the present utility model, in the accompanying drawings:
Fig. 1 is the utility model example structure schematic diagram;
Fig. 2 is the utility model embodiment humidifier body cavity gas circuit schematic diagram;
Fig. 3 is the utility model embodiment dry gas body cavity gas circuit schematic diagram.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the utility model in this illustrative examples of the present utility model and explanation, but not as to restriction of the present utility model.
As shown in FIG. 1 to 3, a kind of testing vapor transmission instrument, comprise casing 10, described casing 10 is provided with test platform, described test platform comprises substrate 11, described substrate 11 is provided with test container, and described test container is used for fixing test sample 14, and by described test sample book 14, described test container is divided into separate humidifier body cavity 12 and dry gas body cavity 13; Described casing 10 is also provided with the humidified gases draft tube and humidified gases escape pipe that are communicated with described humidifier body cavity 12, and the dry gas draft tube be communicated with described dry gas body cavity 13 and dry gas escape pipe; Described dry gas draft tube is provided with mass flow controller, drying tube, and is connected with high pure nitrogen source of the gas, and described dry gas escape pipe is provided with moisture sensor and retaining valve; Described humidified gases draft tube is provided with mass flow controller, humidity generator.
This product adopts the test philosophy of electrolytic process, utilize sample to be fixed in the middle of test chamber to divide humidifier body cavity 12 and dry gas body cavity 13 two chambeies by test chamber, flow at the humidifier body cavity 12 of film containing the gas stablizing relative humidity, dry gas flows at the dry gas body cavity 13 of film, hydrone is diffused in the dry gas of opposite side through sample, be carried into sensor by the gas flowed, by sensor measurement to vapour concentration analyze, thus calculate steam transit dose.
In the present embodiment scheme, described high pure nitrogen source of the gas 1 is connected successively with described drying tube 2, first two position two-way valve 3, four-way connection 4, an output terminal of described four-way connection 4 is connected with nitrogen gas recovering apparatus 5, another two output terminals are connected to the both sides that described mass flow controller 6, two described mass flow controllers 6 are connected to described dry gas body cavity 13.
As the improvement of above-described embodiment scheme, described dry gas body cavity 13 is made up of two cavitys be communicated with, and one of them cavity is provided with condensation-water drain.Water vapour permeability analyzer adopts ultrasonic humidifier to produce water vapour, although this water vapour occurring mode speed is fast, can cause damage if the water droplet that may contain in water vapour enters in gas circuit to sensor.In order to settle the matter once and for all, project team is intended redesigning water vapour occurring mode.First attempt adopting waterproof ventilated membrane hose type steam generator, found that the wet gas current that this device produces cannot reach the humid control area requirement of expecting in design.Secondly attempt carrying out limited heating to water vapour generation cavity, intend by increasing water vapour generation speed, control wet object on a large scale to realize instrument, result but finds that this mode exacerbates the generation of condensate water.Finally by test of many times, project team adopts two individual cavity design to achieve the goal.Namely, when moisture is by first cavity, the water droplet that may contain in moisture is separated, and the condensation-water drain through cavity bottom is discharged.The moisture isolating condensate water enters in second cavity, and then enters moisture sensor.On the other hand, the volume of two individual cavity is only 1/3rd of the wet chamber of tradition control, and it is less that this makes it take up room, and is conducive to the volume reducing water vapour permeability analyzer.
In the present embodiment scheme, the output terminal of described nitrogen gas recovering apparatus 5 is connected with the mass flow controller 6 of described humidified gases draft tube, the output terminal of described mass flow controller 6 is connected with the first two position three-way valve 8, an output terminal of described first two position three-way valve 8 is connected with the first three-way connection 9, an output terminal of described first three-way connection 9 is connected to moisture variable valve 15, another output terminal is connected to dry gas variable valve 16, described moisture variable valve 15 is all connected to the second three-way connection 17 with described dry gas variable valve 16, the output terminal of described second three-way connection 17 is connected to the second two position three-way valve 19 by humidity generator 18, another input end of described second two position three-way valve 19 is connected with another output terminal of described first two position three-way valve 8, the output terminal of described second two position three-way valve 19 is connected to humidifier body cavity 12.
As the improvement of above-described embodiment scheme, described moisture sensor 20 both sides are respectively equipped with retaining valve 21, to improve the measuring accuracy of moisture sensor.
As the improvement of above-described embodiment scheme, below described test container, be also provided with attemperating unit 22.
In order to eliminate residuary water steam in gas circuit to the harmful effect of test process, before the water vapour test of material is carried out, first to carry out bypass, determining " bypass time " value.Design adopts humidifier body cavity 12 and the dry gas body cavity 13 of the purged with nitrogen flow system of about 50ml/min, when ensureing sample both sides equipressure, has accelerated " purging " process.For in traditional water vapour permeability mensuration process, the judgement of bypass time mainly relies on the experience of operator, thus affect the situation of test result accuracy, area (or volume) parameter of the experience of research staff's long term accumulation and sample is summarized as some control laws by system, then judges " bypass time value " according to control law.After reaching the bypass time, the nitrogen flow of upper and lower cavity is all adjusted to the 15ml/min of regulation in GB/T 19789-2005 by system automatically, completes the follow-up flushing to sensor.Compared with the method for traditional permanent flow control, the design has the advantages such as reliability is high, strong adaptability.
Above the technical scheme that the utility model embodiment provides is described in detail, apply specific case herein to set forth the principle of the utility model embodiment and embodiment, the explanation of above embodiment is only applicable to the principle helping to understand the utility model embodiment; Meanwhile, for one of ordinary skill in the art, according to the utility model embodiment, embodiment and range of application all will change, and in sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. a testing vapor transmission instrument, is characterized in that:
Comprise casing, described casing is provided with test platform, and described test platform comprises substrate, and described substrate is provided with test container, described test container is used for fixing test sample, and by described test sample book, described test container is divided into separate humidifier body cavity and dry gas body cavity;
Described casing is also provided with the humidified gases draft tube and humidified gases escape pipe that are communicated with described humidifier body cavity, and the dry gas draft tube be communicated with described dry gas body cavity and dry gas escape pipe;
Described dry gas draft tube is provided with mass flow controller, drying tube, and is connected with high pure nitrogen source of the gas, and described dry gas escape pipe is provided with moisture sensor and retaining valve;
Described humidified gases draft tube is provided with mass flow controller, humidity generator.
2. testing vapor transmission instrument as claimed in claim 1, is characterized in that:
Described high pure nitrogen source of the gas is connected successively with described drying tube, the first two position two-way valve, four-way connection, an output terminal of described four-way connection is connected with nitrogen gas recovering apparatus, another two output terminals are connected to described mass flow controller, and two described mass flow controllers are connected to the both sides of described dry gas body cavity.
3. testing vapor transmission instrument as claimed in claim 2, is characterized in that:
Described dry gas body cavity is made up of two cavitys be communicated with, and one of them cavity is provided with condensation-water drain.
4. testing vapor transmission instrument as claimed in claim 2, is characterized in that:
The output terminal of described nitrogen gas recovering apparatus is connected with the mass flow controller of described humidified gases draft tube, the output terminal of described mass flow controller is connected with the first two position three-way valve, an output terminal of described first two position three-way valve is connected with the first three-way connection, an output terminal of described first three-way connection is connected to moisture variable valve, another output terminal is connected to dry gas variable valve, described moisture variable valve and described dry gas variable valve are all connected to the second three-way connection, the output terminal of described second three-way connection is connected to the second two position three-way valve by humidity generator, another input end of described second two position three-way valve is connected with another output terminal of described first two position three-way valve, the output terminal of described second two position three-way valve is connected to humidifier body cavity.
5. testing vapor transmission instrument as claimed in claim 1, is characterized in that:
Described moisture sensor both sides are respectively equipped with retaining valve.
6. testing vapor transmission instrument as claimed in claim 1, is characterized in that:
Also attemperating unit is provided with below described test container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520291602.7U CN204666473U (en) | 2015-05-08 | 2015-05-08 | Testing vapor transmission instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520291602.7U CN204666473U (en) | 2015-05-08 | 2015-05-08 | Testing vapor transmission instrument |
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| CN204666473U true CN204666473U (en) | 2015-09-23 |
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| CN201520291602.7U Active CN204666473U (en) | 2015-05-08 | 2015-05-08 | Testing vapor transmission instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807737A (en) * | 2015-05-08 | 2015-07-29 | 广州标际包装设备有限公司 | Tester for moisture-vapor transmission rate |
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2015
- 2015-05-08 CN CN201520291602.7U patent/CN204666473U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807737A (en) * | 2015-05-08 | 2015-07-29 | 广州标际包装设备有限公司 | Tester for moisture-vapor transmission rate |
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