阅读说明：本技术 一种水氧透过率测试装置、系统及方法 (Water oxygen transmission rate testing device, system and method ) 是由 韩斐 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种水氧透过率测试装置、系统及方法。该水氧透过率测试装置包括测试腔、水传感器单元、氧传感器单元和多通道开关；测试腔包括上腔和下腔；上腔和下腔扣合形成一封闭空间,上腔和下腔的扣合处用于夹持住待测试样品,封闭空间由待测试样品分割为相互不连通的上腔和下腔；水传感器单元包括至少两个水传感器；氧传感器单元包括至少两个氧传感器；下腔通过第一气路与多通道开关连接；多通道开关分别与每一个水传感器和每一个氧传感器连接。本发明的水氧透过率测试装置可以同时测试材料水蒸气透过率和氧气透过率,还能根据检测要求灵活选择多种量程和精度,有效提高了水蒸气透过率和氧气透过率测试的准确性。(The invention discloses a device, a system and a method for testing water oxygen transmission rate. The water oxygen transmission rate testing device comprises a testing cavity, a water sensor unit, an oxygen sensor unit and a multi-channel switch; the test cavity comprises an upper cavity and a lower cavity; the upper cavity and the lower cavity are buckled to form a closed space, the buckled part of the upper cavity and the lower cavity is used for clamping a sample to be tested, and the closed space is divided into the upper cavity and the lower cavity which are not communicated with each other by the sample to be tested; the water sensor unit comprises at least two water sensors; the oxygen sensor unit includes at least two oxygen sensors; the lower cavity is connected with the multi-channel switch through a first air channel; the multi-channel switch is respectively connected with each water sensor and each oxygen sensor. The water vapor transmission rate testing device can simultaneously test the water vapor transmission rate and the oxygen transmission rate of the material, can flexibly select various measuring ranges and precision according to the detection requirement, and effectively improves the accuracy of the water vapor transmission rate and the oxygen transmission rate test.)

1. The water oxygen permeability testing device is characterized by comprising a testing cavity, a water sensor unit, an oxygen sensor unit and a multi-channel switch;

the test cavity comprises an upper cavity and a lower cavity; one end of the upper cavity is connected with an air inlet pipeline; the air inlet pipeline is used for introducing water vapor and/or oxygen into the upper cavity;

the upper cavity and the lower cavity are buckled to form a closed space, the buckled part of the upper cavity and the lower cavity is used for clamping a sample to be tested, and the closed space is divided into the upper cavity and the lower cavity which are not communicated with each other by the sample to be tested;

the water sensor unit comprises at least two water sensors; the measuring ranges and the precision of any two water sensors are different;

the oxygen sensor unit includes at least two oxygen sensors; the measuring ranges and the precision of any two oxygen sensors are different;

the lower cavity is connected with the multi-channel switch through a first air path;

the multi-channel switch is respectively connected with each water sensor and each oxygen sensor.

2. The water oxygen transmission rate testing device according to claim 1, wherein the number of the testing chambers is 1 or more;

when the number of the test cavities is more than 2, any two test cavities are preferably connected in parallel;

preferably, each test cavity is independently connected with a multi-channel switch through a gas circuit; preferably, any one of the multi-channel switches is connected to each of the water sensors and each of the oxygen sensors.

3. The water oxygen transmission rate testing device as claimed in claim 1 or 2, wherein the other end of the upper chamber is connected with an upper chamber exhaust pipeline;

the upper cavity exhaust pipeline is generally used for directly exhausting gas in the upper cavity; or when the number of the test cavities is more than 2, the upper cavity exhaust pipeline is used for introducing water vapor and/or oxygen into the upper cavity of the next test cavity.

4. The water oxygen transmission rate testing device according to claim 1 or 2, wherein one end of the lower chamber is connected with a gas carrying pipeline; the carrier gas pipeline is used for introducing carrier gas into the lower cavity;

the other end of the lower cavity is preferably connected with a lower cavity exhaust pipeline;

the lower cavity exhaust pipeline is used for directly exhausting gas in the lower cavity; or when the number of the test cavities is more than 2, the lower cavity exhaust pipeline is used for introducing carrier gas into the lower cavity of the next test cavity.

5. The water oxygen transmission rate testing device according to claim 1, wherein any two water sensors are connected in parallel;

any two oxygen sensors are preferably connected in parallel.

6. The water oxygen transmission rate testing device according to claim 1, wherein each water sensor and each oxygen sensor are respectively connected with the multi-channel switch through respective gas paths;

the multi-channel switch is preferably communicated with the air inlet pipeline and the carrier gas pipeline through a first air channel;

preferably, the measurement error accuracy of any two oxygen sensors due to water vapor is different.

7. A water oxygen transmission rate test system, characterized in that the water oxygen transmission rate test system comprises the water oxygen transmission rate test device according to any one of claims 1-6, and a data processor;

and the data processor is respectively connected with each water sensor and each oxygen sensor and is used for collecting detection data and obtaining a test result.

8. A method of testing the water oxygen transmission rate test system according to claim 7, wherein the method of testing the water oxygen transmission rate test system comprises the steps of:

(1) introducing water vapor and/or oxygen into the upper cavity through the air inlet pipeline;

(2) leading carrier gas into the lower cavity through the carrier gas pipeline;

(3) the multi-channel switch is arranged, so that the gas in the lower cavity is connected with the first water sensor with the largest measuring range through a gas path, and the detection is started; collecting a water vapor transmission rate measurement when the water vapor transmission rate measurement is within a range of the first water sensor;

(4) when the water vapor transmission rate measurement is not within the range of the first water sensor, repeating step (3); until the water vapor transmission rate measured value is within the range of any one water sensor, and collecting the water vapor transmission rate measured value; completing the detection of the water vapor transmission rate;

(5) setting the multi-channel switch to enable the gas in the lower cavity to be connected with the first oxygen sensor with the largest measuring range through a gas path and start to detect; collecting an oxygen transmission rate measurement when the oxygen transmission rate measurement is within a range of the first oxygen sensor;

(6) repeating step (5) when the oxygen transmission rate measurement is not within the range of the first oxygen sensor; until the oxygen transmission rate measured value is within the range of any one oxygen sensor, and collecting the oxygen transmission rate measured value; completing the detection of the oxygen transmission rate;

(7) and (3) collecting the water vapor transmission rate measured value acquired in the step (3) or (4) and the oxygen transmission rate measured value acquired in the step (5) or (6) by adopting the data processor to obtain a test result.

9. The method for testing a water oxygen transmission rate test system according to claim 8, wherein in the step (1), water vapor and/or oxygen gas is introduced into the upper chamber of each test chamber;

in step (2), the carrier gas is preferably introduced into the lower chamber of each test chamber.

10. The method for testing a water oxygen transmission rate test system according to claim 8, wherein in the step (4), the step (3) is repeated to set the multi-channel switch, so that the gas in the lower cavity is connected with the second water sensor of the next-stage measuring range through the gas circuit, and the test is started; collecting the water vapor transmission rate measurement when the measurement is within the range of the second water sensor;

in the step (6), preferably, the multi-channel switch is set by repeating the step (5), so that the gas in the lower cavity is connected with the second oxygen sensor with the next-stage measuring range through the gas circuit, and the test is started; collecting the oxygen transmission rate measurement when the measurement is within the range of the second oxygen sensor.

Technical Field

The invention relates to a device, a system and a method for testing water oxygen transmission rate.

Background

In the field of packaging, the barrier property of the packaging material is poor, so that water vapor or oxygen can permeate or permeate the packaging material, and when the packaging material is exposed to the environment for a long time, the problems of aging, deterioration, oxidation and the like of the product can be caused, so that the shelf life is influenced. Therefore, the oxygen barrier property and the water vapor barrier property of the material are very important.

At present, in the prior art, different testing devices are respectively adopted to test the water vapor transmission rate and the oxygen transmission rate of the material, and the simultaneous measurement cannot be completed. Moreover, the testing device only comprises one water sensor or one oxygen sensor, so that the testing device cannot meet the detection requirements of large range and high precision; therefore, a testing device capable of simultaneously testing the water vapor transmission rate and the oxygen transmission rate of the material and realizing a wide-range and high-precision detection is needed.

Disclosure of Invention

The invention aims to solve the problem that the testing device in the prior art cannot simultaneously test the water vapor transmission rate and the oxygen transmission rate of a material and cannot meet the detection requirements of large range and high precision, and provides a water oxygen transmission rate testing device, a system and a method. The water vapor transmission rate testing device can test the water vapor transmission rate and the oxygen transmission rate of the material at the same time, can flexibly select various measuring ranges and precisions according to the detection requirements, and effectively improves the accuracy of the water vapor transmission rate and the oxygen transmission rate test.

In order to achieve the purpose, the invention provides the following technical scheme:

one of the technical schemes provided by the invention is as follows: a water oxygen transmission rate testing device comprises a testing cavity, a water sensor unit, an oxygen sensor unit and a multi-channel switch;

the test cavity comprises an upper cavity and a lower cavity; one end of the upper cavity is connected with an air inlet pipeline; the air inlet pipeline is used for introducing water vapor and/or oxygen into the upper cavity;

the upper cavity and the lower cavity are buckled to form a closed space, the buckled part of the upper cavity and the lower cavity is used for clamping a sample to be tested, and the closed space is divided into the upper cavity and the lower cavity which are not communicated with each other by the sample to be tested;

the water sensor unit comprises at least two water sensors; the measuring ranges and the precision of any two water sensors are different;

the oxygen sensor unit includes at least two oxygen sensors; the measuring ranges and the precision of any two oxygen sensors are different;

the lower cavity is connected with the multi-channel switch through a first air path;

the multi-channel switch is respectively connected with each water sensor and each oxygen sensor.

In the present invention, the number of the test chambers may be 1 or more. When the number of the test cavities is more than 2, any two test cavities can be connected in parallel. Each test cavity can be independently connected with a multi-channel switch through an air path. Preferably, any one of the multi-channel switches is connected to each of the water sensors and each of the oxygen sensors.

The sample to be tested may be conventional in the art, such as a film material, preferably a polyester film (PET) film material.

The other end of the upper cavity can be connected with an upper cavity exhaust pipeline; the upper chamber exhaust line is generally used to directly exhaust the gas in the upper chamber. Or when the number of the test cavities is more than 2, the upper cavity exhaust pipeline can be used for introducing water vapor and/or oxygen into the upper cavity of the next test cavity.

One end of the lower cavity is preferably connected with a gas carrying pipeline. The carrier gas pipeline is used for introducing carrier gas into the lower cavity. The carrier gas may be conventional in the art, e.g. N₂A carrier gas, or, an N-H carrier gas.

The other end of the lower cavity is preferably connected with a lower cavity exhaust pipeline. The lower cavity exhaust pipeline is used for directly exhausting gas in the lower cavity. Or when the number of the test cavities is more than 2, the lower cavity exhaust pipeline can be used for introducing carrier gas into the lower cavity of the next test cavity.

In the present invention, any two water sensors may be connected in parallel. Any two oxygen sensors may be connected in parallel.

In the invention, each water sensor and each oxygen sensor are respectively connected with the multi-channel switch through respective gas paths; the multi-channel switch can be communicated with the air inlet pipeline and the gas carrying pipeline through the first gas circuit.

In the invention, the measurement error precision of any two oxygen sensors caused by water vapor is different.

The second technical scheme provided by the invention is as follows: a water oxygen transmission rate testing system, which comprises the water oxygen transmission rate testing device and a data processor;

and the data processor is respectively connected with each water sensor and each oxygen sensor and is used for collecting detection data and obtaining a test result.

The third technical scheme provided by the invention is as follows: a method for testing a water oxygen transmission rate testing system as described above, said method comprising the steps of:

(1) introducing water vapor and/or oxygen into the upper cavity through the air inlet pipeline;

(2) leading carrier gas into the lower cavity through the carrier gas pipeline;

(3) the multi-channel switch is arranged, so that the gas in the lower cavity is connected with the first water sensor with the largest measuring range through a gas path, and the detection is started; collecting a water vapor transmission rate measurement when the water vapor transmission rate measurement is within a range of the first water sensor;

(4) when the water vapor transmission rate measurement is not within the range of the first water sensor, repeating step (3); until the water vapor transmission rate measured value is within the range of any one water sensor, and collecting the water vapor transmission rate measured value; completing the detection of the water vapor transmission rate;

(5) setting the multi-channel switch to enable the gas in the lower cavity to be connected with the first oxygen sensor with the largest measuring range through a gas path and start to detect; collecting an oxygen transmission rate measurement when the oxygen transmission rate measurement is within a range of the first oxygen sensor;

(6) repeating step (5) when the oxygen transmission rate measurement is not within the range of the first oxygen sensor; until the oxygen transmission rate measured value is within the range of any one oxygen sensor, and collecting the oxygen transmission rate measured value; completing the detection of the oxygen transmission rate;

(7) and (3) collecting the water vapor transmission rate measured value acquired in the step (3) or (4) and the oxygen transmission rate measured value acquired in the step (5) or (6) by adopting the data processor to obtain a test result.

In step (1), preferably, water vapor and/or oxygen gas is introduced into the upper chamber of each test chamber.

In step (2), preferably, a carrier gas is introduced into the lower chamber of each test chamber.

In the step (4), the multi-channel switch can be set by repeating the step (3), so that the gas in the lower cavity is connected with the second water sensor in the next-stage measuring range through the gas path, and the test is started; collecting the water vapor transmission rate measurement when the measurement is within the range of the second water sensor.

In the step (6), the multi-channel switch can be set by repeating the step (5), so that the gas in the lower cavity is connected with the second oxygen sensor with the next-stage measuring range through the gas circuit, and the test is started; collecting the oxygen transmission rate measurement when the measurement is within the range of the second oxygen sensor.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows:

the water oxygen transmission rate testing device can simultaneously test the water vapor transmission rate and the oxygen transmission rate of the material; and can flexibly select various measuring ranges and precisions according to the detection requirements; and the accuracy of the water vapor transmission rate and the oxygen transmission rate test is effectively improved.

Drawings

Fig. 1 is a schematic view of a water oxygen transmission rate test apparatus in example 1.

Reference numerals

Test chamber 1

Upper chamber 11

Lower chamber 12

Sample to be tested 13

Water sensor unit 2

First water sensor 21

Second water sensor 22

Oxygen sensor unit 3

First oxygen sensor 31

Second oxygen sensor 32

Multi-channel switch 4

Air inlet pipeline 5

First air passage 6

Upper cavity exhaust pipeline 7

Gas-carrying pipeline 8

Lower chamber exhaust line 9

Second air passage 211

Third air passage 221

Fourth air passage 311

Fifth air passage 321

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Example 1

As shown in fig. 1, the water oxygen permeability test apparatus in embodiment 1 includes a test chamber 1, a water sensor unit 2, an oxygen sensor unit 3, and a multi-channel switch 4;

the test chamber 1 comprises an upper chamber 11 and a lower chamber 12; one end of the upper cavity 11 is connected with the air inlet pipeline 5; the air inlet pipeline 5 is used for introducing water vapor and/or oxygen into the upper cavity 11;

the upper cavity 11 and the lower cavity 12 are buckled to form a closed space, the buckled part of the upper cavity 11 and the lower cavity 12 is used for clamping a sample to be tested 13, and the closed space is divided into the upper cavity 11 and the lower cavity 12 which are not communicated with each other by the sample to be tested 13;

the water sensor unit 2 includes a first water sensor 21 and a second water sensor 22; the first water sensor 21 and the second water sensor 22 have different ranges and accuracies; the range of the first water sensor 21 is larger than the range of the second water sensor 22;

the oxygen sensor unit 3 includes a first oxygen sensor 31 and a second oxygen sensor 32; the first oxygen sensor 31 and the second oxygen sensor 32 have different ranges and accuracies; the range of the first oxygen sensor 31 is larger than the range of the second oxygen sensor 32;

the lower cavity 12 is connected with the multi-channel switch 4 through a first air channel 6;

the multi-channel switch 4 is connected to the first water sensor 21, the second water sensor 22, the first oxygen sensor 31, and the second oxygen sensor 32, respectively.

In example 1, the number of test chambers 1 was 1.

The sample 13 to be tested was a polyester film (PET) film material purchased from Guangzhou Dart packaging Equipment Ltd, thickness 125 μm [ Standard substance Nos. GBW (E)130498, GBW (E)130543 ], and oxygen transmission rate rating of 12.3. + -. 0.9cm³/(m²24h), water vapor transmission rate fixed value of 4.4. + -. 0.8 g/(m)²·24h)。

The other end of the upper cavity 11 is connected with an upper cavity exhaust pipeline 7; the upper chamber exhaust line 7 is used for directly exhausting the gas in the upper chamber 11.

One end of the lower chamber 12 is connected to the carrier gas line 8. The carrier gas line 8 is used for introducing carrier gas into the lower cavity 12. The carrier gas is N₂And (4) a carrier gas.

The other end of the lower cavity 12 is connected with a lower cavity exhaust pipeline 9. The lower chamber exhaust line 9 is used for directly exhausting the gas in the lower chamber 12.

In embodiment 1, the first water sensor 21, the second water sensor 22, the first oxygen sensor 31 and the second oxygen sensor 32 are respectively connected with the multi-channel switch 4 through the second gas path 211, the third gas path 221, the fourth gas path 311 and the fifth gas path 321; the multi-channel switch 4 is communicated with the air inlet pipeline 5 and the carrier gas pipeline 8 through the first air pipeline 6.

The first oxygen sensor 31 and the second oxygen sensor 32 are different in accuracy of measurement error due to water vapor.

In the water oxygen transmission rate testing apparatus according to embodiment 1, the first water sensor 21, the second water sensor 22, the first oxygen sensor 31, and the second oxygen sensor 32 are connected to the data processor, respectively, to form a water oxygen transmission rate testing system. The data processor is used for collecting detection data and obtaining a test result.

The detection method of the water oxygen transmission rate test system in the embodiment 1 comprises the following steps:

(1) introducing water vapor and/or oxygen into the upper chamber 11 through the air inlet pipeline 5;

(2) the carrier gas is introduced into the lower cavity 12 through the carrier gas pipeline 8;

(3) arranging a multi-channel switch 4, connecting the gas in the lower cavity 12 with the first water sensor 21 with the largest measuring range through a second gas path 211, and starting to detect; collecting a water vapor transmission rate measurement value when the water vapor transmission rate measurement value is within the range of the first water sensor 21;

(4) when the water vapor transmission rate measurement value is not within the range of the first water sensor 21, repeating step (3); specifically, the multi-channel switch 4 is arranged, so that the gas in the lower cavity 12 is connected with the second water sensor 22 in the next-stage measuring range through the third gas path 221, and the test is started; collecting a water vapor transmission rate measurement when the measurement is within the range of the second water sensor 22; completing the detection of the water vapor transmission rate;

(5) a multi-channel switch 4 is arranged, so that the gas in the lower cavity 12 is connected with the first oxygen sensor 31 with the largest measuring range through a fourth gas path 311, and the detection is started; collecting the oxygen transmission rate measurement when the oxygen transmission rate measurement is within the range of the first oxygen sensor 31;

(6) when the oxygen transmission rate measurement is not within the span range of the first oxygen sensor 31, repeating step (5); specifically, the multi-channel switch 4 is arranged, so that the gas in the lower chamber 12 is connected with the second oxygen sensor 32 in the next-stage measuring range through the fifth gas path 321, and the test is started; collecting an oxygen transmission rate measurement when the measurement is within the span of the second oxygen sensor 32; completing the detection of the oxygen transmission rate;

(7) collecting the water vapor transmission rate measured value acquired in the step (3) or (4) and the oxygen transmission rate measured value acquired in the step (5) or (6) by using a data processor to obtain a test result; wherein the oxygen transmission rate of the polyester film (PET) film material is 12.1cm³/(m²24h) water vapor transmission rate of4.2g/(m²·24h)。

Example 2

In the water oxygen transmission rate testing apparatus of embodiment 2, the water sensor unit includes a first water sensor, a second water sensor, and a third water sensor connected in parallel; the measuring ranges of the first water sensor, the second water sensor and the third water sensor are reduced in sequence;

the oxygen sensor unit comprises a first oxygen sensor, a second oxygen sensor and a third oxygen sensor which are connected in parallel; the measuring ranges of the first oxygen sensor, the second oxygen sensor and the third oxygen sensor are reduced in sequence;

the rest of the procedure was the same as in example 1.