CN203479652U - Water vapor transmission rate tester employing desiccant method - Google Patents
Water vapor transmission rate tester employing desiccant method Download PDFInfo
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- CN203479652U CN203479652U CN201320566935.7U CN201320566935U CN203479652U CN 203479652 U CN203479652 U CN 203479652U CN 201320566935 U CN201320566935 U CN 201320566935U CN 203479652 U CN203479652 U CN 203479652U
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- weightening finish
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Abstract
The utility model discloses a water vapor transmission rate tester employing a desiccant method. The tester comprises a test stand, wherein a test cavity is formed in the test stand; a fixture for clamping a test sample is arranged in the test cavity; the test sample and the fixture divide the test cavity into an upper cavity and a lower cavity; a weighing balance is arranged at the bottom of the lower cavity, and a cylinder support frame capable of moving up and down is arranged on the inner wall of the lower cavity; a water vapor transmission cup is arranged on the cylinder support frame; a water vapor inlet and a water vapor outlet are formed in the sidewall of the upper cavity; the upper cavity is sleeved with a heat-preservation cover. The tester has the advantages that the desiccant method is used for testing the water vapor transmission rate, so that the defects of dew formation of a thin film of a water vapor transmission rate tester employing a water method and influence of airflow on a test result under an air blowing condition are overcome; the test method is reasonable, the test result is accurate, and errors are insignificant; an ARM (advanced RISC machine)-based intelligent control system is used for realizing offline operation, and the tester is convenient to operate.
Description
Technical field
The utility model relates to water vapor transmittance analyzer field, especially a kind of water vapor transmittance analyzer that utilizes weightening finish method to measure water vapor transmittance.
Background technology
Food and medicine are the healthy closely bound up commodity with people, these type of commodity not only require to accomplish on the packaging attractive in appearance, convenient and practical, the more important thing is and will guarantee that content has stable, reliable quality in shelf life, prevent because the moisture absorption, gas leakage and illumination cause that the decomposition of product in inner packing is rotten.Therefore, selection has the key that the packing of barrier function is assurance food and drug safety.
The barrier of wrappage is for specific infiltration object, and (infiltration object comprises common gas, water vapour, liquid and organism etc.) refers to that material is permeated by arriving the barrier property of opposite side (being generally to enter low concentration side by the infiltration of high concentration side by material) by one side specific infiltration object.Say narrowly, barrier property mainly comprises oxygen-barrier property and water vapor barrier.And effective constituent in fat, protein and medicine in food is easily hydrolyzed under steam existence condition, variable color, the rotten toxicity that even produces, therefore the detection for food and drug packing material steam breathability has very important significance.
In prior art, for testing the checkout equipment of the water vapor transmittance of food and drug packing material, all adopt weight reduction water vapour permeability analyzer, with moisture vapor transmission cup dress water and then rim of a cup, cover sample, control the temperature of test chamber at 38 ℃, water vapor diffusion in cup is to test chamber, drying agent in tested chamber absorbs, and the moisture in cup reduces, and by the weighing scale of test moisture vapor transmission cup, calculates water vapour transit dose.And weight reduction water vapour permeability analyzer is in experimentation, water vapour can see through film diffusion and go out, but film can dewfall, and moisture vapor transmission cup and film connect together and weigh, so can cause to weighing certain error; Due to the humidity that will control in test chamber, thus to blow, and very high its precision of LOAD CELLS sensitivity requiring is 0.1mg, and therefore the situation downstream in blowing also has a certain impact to weighing, and the transit dose error of calculating is very large.
Therefore urgently develop and a kind ofly can overcome the impact that weight reduction water vapor transmittance analyzer film dewfall and blowing situation downstream cause test result and test error is little, degree of accuracy and the high water vapor transmittance analyzer of accuracy.
Utility model content
The purpose of this utility model is the defect that overcomes above-mentioned prior art, provide a kind of method of testing more rationally, little, the degree of accuracy of test error and the higher weightening finish method water vapor transmittance analyzer of accuracy.
The technical solution of the utility model is achieved in that a kind of weightening finish method water vapor transmittance analyzer, comprise tester table, in described tester table, be provided with test chamber, in described test chamber, be provided with the fixture of establishing specimen for blocking, described specimen and fixture are divided into epicoele and cavity of resorption by described test chamber, the bottom of described cavity of resorption is provided with weigh scale, is provided with cylinder supports frame moving up and down on its inwall, on described cylinder supports frame, is provided with moisture vapor transmission cup; On the sidewall of described epicoele, be provided with steam input port and steam delivery outlet, described epicoele outer cover is provided with insulation cover.
Further, in described weigh scale, be provided with LOAD CELLS.
Further, described steam equipped at outlet port is provided with and controls the first switch valve that described delivery outlet opens and closes.
Further, in described tester table, be also provided with steam generating unit and control system, described steam generating unit comprises humidity generator, gas hybrid chamber and flow valve, described in described humidity generator, gas hybrid chamber is connected, and described gas hybrid chamber is connected with described steam input port by flow valve.Part dry air flows in described gas hybrid chamber after by humidity generator, another part dry gas is fed directly to described gas hybrid chamber, and the mixing steam in described gas hybrid chamber enters in described epicoele from described steam input port by flow valve.
Further, between described humidity generator and gas hybrid chamber, be provided with second switch valve.
Further, described control system comprises MCU and temperature control system, and described MCU controls described temperature control system and humidity generator.
Particularly, described temperature control system adopts the embedded electronic temperature regulating device with the lifting of integrated setting A.T.C.
Further, the output terminal of described MCU is also connected with display module, print module and PC.
Particularly, described MCU adopts ARM9 series processors.
Further, described test chamber adopts stainless steel to make.
The utility model has the advantages that: adopt weighting procedure test water vapor transmittance, overcome the impact that weight reduction water vapor transmittance analyzer film dewfall and blowing situation downstream cause test result; Method of testing is more reasonable, and test result is more accurate, and error is less; And adopt the intelligent control system based on ARM can offline operation, more convenient operation.
Accompanying drawing explanation
Fig. 1 is a kind of weightening finish method of the utility model water vapor transmittance analyzer structured flowchart.
Fig. 2 is the structural representation of a kind of increase weight method water vapor transmittance analyzer steam generating unit and test chamber of the utility model.
Fig. 3 is the schematic block circuit diagram of a kind of method water vapor transmittance analyzer control system that increases weight of the utility model.
Embodiment
Below in conjunction with accompanying drawing, concrete case study on implementation of the present utility model is illustrated:
As shown in Figure 1, a kind of weightening finish method water vapor transmittance analyzer, comprise tester table 1, in described tester table 1, be provided with steam generating unit 3, test chamber 2 and control system 4, the steam that described steam generating unit 3 produces is input in described test chamber 2, described control system 4 is controlled the generation of described steam generating unit 3 steam, the test process of the temperature humidity of steam and described test chamber 2.
As shown in Figure 2, particularly, in described test chamber, 2 are provided with the fixture 21 of establishing specimen 5 for blocking, and described specimen 5 and fixture 21 are divided into epicoele 23 and cavity of resorption 24 by described test chamber.On the outer wall of described test chamber 2, be provided with screw thread, described screw thread is arranged on the outer wall that the binding site of epicoele 23 and cavity of resorption 24 is corresponding, on described epicoele 23, be arranged with insulation cover 22, the bottom of described insulation cover 22 inwalls is provided with the screw thread caulking groove corresponding with described screw thread, described screw thread coordinates and screws with screw thread caulking groove, simultaneously, the junction of described epicoele 23 and cavity of resorption 24 is arranged with O-ring seal, make described test chamber 2 in complete sealing state, the setting of described insulation cover 22 has certain heat and moisture preserving effect for the steam in described epicoele 23.On the sidewall of described epicoele 23, be provided with steam input port 28 and steam delivery outlet 29, described steam input port 28 and steam delivery outlet 29 are for being arranged side by side, described steam delivery outlet 29 places are provided with and control the first switch valve 61 that described delivery outlet 29 opens and closes, during test, described the 3rd switch valve 61 should be in opening, steam can stably be circulated, for guaranteeing the stable of the interior steam humidity of described epicoele 23 and flow velocity, the humidity of described epicoele 23 interior steam should remain on 30%-90%RH, and precision is ± 2%RH.
In the bottom of described cavity of resorption 24, weigh scale 25 is installed, the balance portion of described weigh scale 25 extend in described cavity of resorption 24, the demonstration of described weigh scale 25 and data reading part are arranged on outside described cavity of resorption 24, and described weigh scale 25 adopts encapsulation process with the junction of described cavity of resorption 24; In described weigh scale 25, be provided with LOAD CELLS 210, described LOAD CELLS 210 can carry out responding to intermittence and weighing; On the inwall of described cavity of resorption 24, be provided with cylinder supports frame 26 moving up and down, on described cylinder supports frame 26, be provided with moisture vapor transmission cup 27, during test, by cylinder supports frame described in the programmed control of control system 4 26, moved, described cylinder supports frame 26 motions drive described moisture vapor transmission cup 27 to rise to specimen 5 belows, make described drying agent be positioned at distance 5 three millimeters of places of described specimen, after test a period of time, described cylinder supports frame 26 moves downward again and moisture vapor transmission cup is put in described weigh scale 25 weigh, thus test and intermittent weighing repeatedly.
As shown in Figure 3, described steam generating unit 3 comprises humidity generator 31, gas hybrid chamber 32 and flow valve 33.Described humidity generator 31 is connected with described gas hybrid chamber 32, and described gas hybrid chamber 32 is connected with described steam input port 28 by flow valve 33, between described humidity generator 31 and gas hybrid chamber 32, is provided with second switch valve 62.Wherein, described humidity generator 31 adopts two airflow humidity generators, and described pair of airflow humidity generator steam generation speed is fast, and humidification is stable, and can make well Temperature and Humidity Control scope; In described gas hybrid chamber 32, be provided with humidity sensor 34, for regulating the blending ratio of water vapour and gas, thereby reach the humidity of controlling steam; Described flow valve 33 can be adjusted flow and the flow velocity of gas output effectively, and described flow valve 33 can be by the flow control of gas within 0.5-2.5m/s.During use, adopt nitrogen as carrier gas, after becoming water vapor nitrogen by humidity generator 31 humidifications, part drying nitrogen flow in described gas hybrid chamber 32 by described second switch valve 62, another part drying nitrogen directly flow into described gas hybrid chamber 32 by the 3rd switch valve 63, water vapour nitrogen in described gas hybrid chamber 32 and drying nitrogen by described humidity sensor 34 adjusting ratios after, through described flow valve 33, from described steam input port 28, enter in described epicoele 23 again, so both guaranteed that gas humidity was relatively stable, also can control the temperature of gas humidity and test epicoele.
As shown in Figure 3, described control system comprises MCU and temperature control system, and described MCU controls described temperature control system and humidity generator.Temperature control system described here adopts the embedded electronic temperature regulating device with the lifting of integrated setting A.T.C, described embedded electronic temperature regulating device is integrated form temperature control plate (integrated form temperature control plate just refers to the temperature controller of integrated form), described integrated form temperature control plate is arranged in described test chamber, described temperature control system is controlled the temperature of described epicoele 23 and cavity of resorption 24 automatically: by integrated form temperature control, the gas of described epicoele 23 interior constant rates is heated, gas-heated is arrived to probe temperature; Described in described cavity of resorption 24 epicoele 23 by and its by the direct temperature control of integrated form temperature control plate, by software, carry out program stepping and control probe temperature, both can heat up and also can lower the temperature, temperature control is accurate.Probe temperature in test chamber should be controlled at 15-45 ℃, 38 ℃ of standard temperatures, precision ± 0.1 ℃.
Further, described MCU adopts ARM9 series processors, and sets up W500 series water vapor transmittance analyzer dedicated system based on ARM9 microprocessor.32 risc processors that described ARM9 microprocessor is low-power consumption, ARM9 microprocessor is the core component of whole W500 series water vapor transmittance analyzer dedicated system, humidity sensor, integrated form temperature control plate and LOAD CELLS described in major control, the MCU output terminal of described control system is also connected with display module, print module and PC simultaneously.During use, ARM microprocessor sends signal to core components such as Temperature Humidity Sensor, LOAD CELLS, starts corresponding sensor image data, and sensor has gathered after a secondary data, and simulated data amount is transformed into the digital signal that ARM microprocessor can be identified.Then by ARM microprocessor, according to scene, the difference of data is required to show data by described display module and PC.What adopt due to ARM9 is the processing speed that three class pipeline increases instruction, and the operation of several like this instructions just can be carried out simultaneously, in an instruction of execution, next instruction is carried out to decoding, and the 3rd instruction taken out from storer.So arithmetic speed and the precision of the W500 series water vapor transmittance analyzer dedicated system based on ARM9 significantly improve, realized the real-time follow-up of sample information has been shown, efficiently solve communication latency issue, and the arithmetic speed of the water vapor transmittance analyzer special intelligent type control system based on ARM9 is faster, stability is better, with better function.Arithmetic speed makes its condition that has possessed operation WindowsCE system faster, executive routine under stable, safety, long-tested WindowsCE system, and the reliability of special intelligent type control system has had essential raising.This cover software divides two large divisions, and one is the software on instrument, and another is computer software, and off line can work independently.
Test philosophy of the present utility model is: in the middle of sample is fixed on to test chamber, by test chamber, divide upper and lower two chambeies, containing the gas of stablizing relative humidity, at the epicoele of film, flow, on cavity of resorption pallet, place the moisture vapor transmission cup that drying agent is housed, hydrone sees through sample and is diffused into cavity of resorption, molecular sieve by moisture vapor transmission cup the inside absorbs, weighing by LOAD CELLS to dry cup, thus calculate steam transit dose.
While using the utility model, after the described fixture 21 of specimen 5 use is fixing, interior mobile at described epicoele 23 by the gas that the humiture of described steam generating unit 3 generations is stable, hydrone sees through specimen 5 and is diffused into described cavity of resorption 24, drying agent by moisture vapor transmission cup 27 the insides absorbs, then by the weighing of 210 pairs of moisture vapor transmission cups 27 of described LOAD CELLS, thereby calculate steam transit dose.Its concrete testing procedure is: 1. the temperature control of starting shooting; 2 regulate humidity and gas flow according to instrument display; The direct hit testing of 3 setting-out product; 5 results out, stop test automatically, print laboratory report.
The utility model can be applicable to test film material, sheet material, engineering plastics, the rubber such as plastic sheeting, composite plastic film, paper-plastic composite film, co-extrusion film, aluminizer, aluminium foil, foil laminated film, the flaky materials such as building materials, as PP sheet material, PVC sheet material, PVDC sheet material, glass ceramics etc., the utility model can also expanded application be tested in water preventing abilities such as sun power backboard membrane, LCDs film, all kinds of paint film, degradative membrane, medical patch, closing flaps, bottle, sacks simultaneously.
The utility model is more suitable for laboratory and uses, and its function meets national standard and international standard, has improved the versatility of instrument; Adopt accurate Temperature and Humidity Control technology, reduce error effect test result being produced due to Temperature and Humidity Control precision; Adopt the method for accurately controlling gas flow, improve the accuracy of instrument test result; Adopt water vapor transmittance analyzer special intelligent system, assurance client can be monitored in real time to test overall process, and can by different modes, carry out data processing to test result; Realize the self-diagnostic function of water vapor transmittance analyzer control system, be convenient to slip-stick artist with minimum consumption, can within the shortest time, get rid of the fault that instrument produces; Large cold storage volume is relatively little relatively, and adopt weighting procedure test water vapor transmittance, method of testing is more reasonable, test result is more accurate, and error is less, and the intelligent control system based on ARM can offline operation, and can input data by mouse action, in conjunction with automatic, manual, online, off-line operation, interface is simple, easy to operate.
As described above, it is only the utility model preferred embodiment, when not limiting the scope that the utility model is implemented with this, the simple equivalence of generally doing according to the utility model claim and invention description content changes and modifies, and all still belongs in the scope that the utility model patent contains.
Claims (10)
1. a weightening finish method water vapor transmittance analyzer, comprise tester table, it is characterized in that: in described tester table, be provided with test chamber, in described test chamber, be provided with the fixture of establishing specimen for blocking, described specimen and fixture are divided into epicoele and cavity of resorption by described test chamber, the bottom of described cavity of resorption is provided with weigh scale, is provided with cylinder supports frame moving up and down on its inwall, on described cylinder supports frame, is provided with moisture vapor transmission cup; On the sidewall of described epicoele, be provided with steam input port and steam delivery outlet, described epicoele outer cover is provided with insulation cover.
2. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 1, is characterized in that, in described weigh scale, is provided with LOAD CELLS.
3. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 1, is characterized in that, described steam equipped at outlet port is provided with controls the first switch valve that described delivery outlet opens and closes.
4. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 1, it is characterized in that, in described tester table, be also provided with steam generating unit and control system, described steam generating unit comprises humidity generator, gas hybrid chamber and flow valve, described humidity generator is connected with described gas hybrid chamber, and described gas hybrid chamber is connected with described steam input port by flow valve.
5. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 4, is characterized in that, between described humidity generator and gas hybrid chamber, is provided with second switch valve.
6. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 4, is characterized in that, described control system comprises MCU and temperature control system, and described MCU controls respectively described temperature control system and humidity generator.
7. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 6, is characterized in that, described temperature control system adopts the embedded electronic temperature regulating device with the lifting of integrated setting A.T.C.
8. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 6, is characterized in that, described control system comprises that the output terminal of MCU is also connected with display module, print module and PC.
9. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 6, is characterized in that, described MCU adopts ARM9 series processors.
10. a kind of weightening finish method water vapor transmittance analyzer as claimed in claim 6, is characterized in that, described test chamber adopts stainless steel to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320566935.7U CN203479652U (en) | 2013-09-12 | 2013-09-12 | Water vapor transmission rate tester employing desiccant method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320566935.7U CN203479652U (en) | 2013-09-12 | 2013-09-12 | Water vapor transmission rate tester employing desiccant method |
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| CN203479652U true CN203479652U (en) | 2014-03-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471951A (en) * | 2013-09-12 | 2013-12-25 | 广州标际包装设备有限公司 | Water vapor transmission rate tester adopting weight increase method |
| CN104596906A (en) * | 2015-01-16 | 2015-05-06 | 上海大学 | Water and oxygen air permeability measuring system with multiple measuring heads |
| CN107490539A (en) * | 2017-08-23 | 2017-12-19 | 成都本华清博科技有限公司 | Device and method for measuring moisture permeability of sheet material |
| CN107560964A (en) * | 2017-08-23 | 2018-01-09 | 成都本华清博科技有限公司 | Device and method for measuring water permeability of sheet material |
-
2013
- 2013-09-12 CN CN201320566935.7U patent/CN203479652U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471951A (en) * | 2013-09-12 | 2013-12-25 | 广州标际包装设备有限公司 | Water vapor transmission rate tester adopting weight increase method |
| CN103471951B (en) * | 2013-09-12 | 2016-04-06 | 广州标际包装设备有限公司 | A kind of weightening finish method water vapor transmittance analyzer |
| CN104596906A (en) * | 2015-01-16 | 2015-05-06 | 上海大学 | Water and oxygen air permeability measuring system with multiple measuring heads |
| CN107490539A (en) * | 2017-08-23 | 2017-12-19 | 成都本华清博科技有限公司 | Device and method for measuring moisture permeability of sheet material |
| CN107560964A (en) * | 2017-08-23 | 2018-01-09 | 成都本华清博科技有限公司 | Device and method for measuring water permeability of sheet material |
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