Device for testing water vapor permeability by gravimetric method

Abstract

The utility model belongs to the technical field of water vapor permeability testing. The device for testing the water vapor permeability by the gravimetric method comprises a moisture generation system and a test bin which are integrally arranged, a gas inlet port of the moisture generation system is used for being connected with a gas source through a first pipeline, and a gas outlet port of the moisture generation system is communicated with a first gas inlet port of a gas spray pipe through a one-way valve; a second gas inlet port of the gas spraying pipe is used for being communicated with the gas source through a second pipeline, and a gas outlet hole communicated with the test bin is formed in the side wall of the gas spraying pipe; the first pipeline is connected with at least one second valve, the second pipeline is connected with at least one third valve, a tray connected with the rotary lifting system is arranged in the test bin, and a weighing tray of the weighing system is arranged in the test bin. The device can be used for conveniently, efficiently and accurately measuring the water vapor permeability of a film, a sheet and a container, has an automatic water replenishing function, and can meet the requirement of long-time testing.

Description

TECHNICAL FIELD

[0001] The utility model relates to water vapor permeability test technical field, especially relate to a device for testing water vapor permeability by weight method. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute the prior art.

[0003] At present, when testing the water vapor permeability of film or sheet, the weight method (cup method) is usually used for testing, and the principle is to form a stable humidity difference on both sides of the sample, and water vapor diffuses from the high humidity side to the low humidity side through the sample; by measuring the change amount of the weight of the moisture permeable cup with time, the water vapor permeability and other parameters of the sample can be obtained, and the weight loss method is used for testing the dry side of the test cavity, and the weight gain method is used for testing the high humidity side of the test cavity.

[0004] The inventor finds that the existing device for testing water vapor permeability by weight method has the following disadvantages: the humidity generation system is independently arranged outside the test chamber, the overall device structure is complex, the cost is high, the humidity control efficiency is low, the humidity control precision is low, and the like. Moreover, since the types of samples are various, there are not only films and sheets, but also various containers, the existing weight method for testing is to install the sample on a special moisture permeable cup for testing, which has good operability for films and sheets, but for container samples, the container needs to be damaged, a part of the material is removed to become a film or sheet, and then the film or sheet is installed on the special moisture permeable cup for testing, which has poor operability, damages the container sample, does not meet the working condition of the sample, cannot directly reflect the water vapor barrier property of the sample, and the water vapor permeability obtained by testing has certain difference from the water vapor permeability of the sample in actual application; since the sizes of the container samples are various, the volume span is large, and the volume of the test chamber of the existing equipment is difficult to meet the testing requirement; and since the volume of the humidity generation system of the existing equipment is generally small, the water storage capacity is limited, and the long-time testing requirement cannot be met. UTILITY MODEL CONTENTS

[0005] In order to solve the problems in the prior art, the utility model provides a device for testing water vapor permeability by weight method, which can conveniently, efficiently and accurately measure the water vapor permeability of films, sheets and containers, has an automatic water supplement function, and can meet the long-time testing requirement.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A device for testing water vapor transmission rate by weight method, comprising: a humidity generating system and a test chamber arranged integrally, an air inlet port of the humidity generating system is connected with a gas source through a first pipeline, an air outlet port of the humidity generating system is communicated with a first air inlet port of a gas jet pipe through a first valve;

[0008] A second air inlet port of the gas jet pipe is communicated with the gas source through a second pipeline, and an air outlet hole of the gas jet pipe arranged on a side wall is communicated with the test chamber;

[0009] At least one second valve is connected on the first pipeline, at least one third valve is connected on the second pipeline, a tray connected with a rotary lifting system is arranged in the test chamber, and a weighing tray of a weighing system is arranged in the test chamber.

[0010] As a further limitation of the utility model, the humidity generating system comprises: a liquid chamber, a liquid level sensor is fixed in the liquid chamber, and an upper gas space in the liquid chamber is communicated with the first pipeline through the air inlet port of the humidity generating system;

[0011] A liquid port at the bottom of the liquid chamber is communicated with a water storage container through a liquid pipeline, and the upper gas space in the liquid chamber is communicated with the gas jet pipe through the first valve.

[0012] As a further limitation of the utility model, an exhaust port is arranged at the bottom of the test chamber, and a valve is arranged on the exhaust port.

[0013] As a further limitation of the utility model, a temperature and humidity sensor is connected in the test chamber, a fan is connected at the top center position in the test chamber, air is drawn in through an axial air inlet of the fan, and air is blown to the periphery of the fan through an air outlet of the fan, so that a uniform and adjustable test air speed area is formed in the test chamber.

[0014] As a further limitation of the utility model, a heat preservation layer is arranged on the outer side wall of the test chamber and the humidity generating system, and a temperature control system is arranged in the heat preservation layer.

[0015] As a further limitation of the utility model, the first valve is a one-way valve or an intelligent valve capable of controlling one-way flow of air.

[0016] As a further limitation of the utility model, the bottom wall of the test chamber serves as the top wall of the humidity generating system.

[0017] As a further limitation of the utility model, the tray is used for carrying a moisture permeable cup.

[0018] As a further limitation of the utility model, the tray is used for carrying a container sample through a container sample bracket.

[0019] As a further limitation of the utility model, the rotating lifting system and the weighing system are fixedly connected with the heat preservation layer respectively, the rotating lifting system is mutually isolated with the liquid bin, and the weighing system is mutually isolated with the liquid bin.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] 1、The test device for testing water vapor permeability by weight method can meet the related requirements of the water vapor permeability test standard by weight method, can perform long-time continuous test, and innovatively adopts the structure of integrating the moisture generation system with the test bin, so that the moisture generation system becomes a part of the test bin and bears the basic structure of the test bin.

[0022] 2、Compared with the traditional form that the moisture generation system is independently arranged outside the test bin, the number of parts is reduced, the complexity of the mechanical structure is reduced, a separate temperature control component is saved, the test bin and the moisture generation system can be directly controlled in temperature by the temperature control system, therefore, the test device has the characteristics of high humidity control efficiency, high humidity control precision and simple humidity control structure.

[0023] 3、The test device for testing water vapor permeability by weight method has a large test bin body space, can not only test film and sheet samples, but also test container samples, realizes one machine with multiple functions, and saves the cost of customers.

[0024] 4、The fan is connected to the top center position in the test bin, air is introduced into the fan through the axial air inlet, air is blown to the periphery of the fan through the air outlet on the fan, a uniform and adjustable test air speed area is formed in the test bin, different test air speed environments can be provided, and the application range of the whole device is improved.

[0025] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0027] Figure 1 The structure schematic view of the device for testing water vapor permeability by weight method provided by the utility model during test is shown in the figure.

[0028] Figure 2The utility model provides a structure schematic view of the device for testing water vapor permeability by weight method when weighing;

[0029] Figure 3 The utility model provides a structure schematic view of the device for testing water vapor permeability by weight method when weighing;

[0030] Figure 4 The utility model provides a structure schematic view of the device for testing water vapor permeality by weight method when weighing container sample;

[0031] Among them, 1, gas source, 2, third valve, 3, second valve, 4, test bin, 5, gas jet pipe, 6, temperature and humidity sensor, 7, fan, 8, moisture cup, 9, temperature control system, 10, exhaust port, 11, first valve, 12, moisture generation system, 13, rotation lifting system, 14, weighing system, 15, water pump, 16, liquid level sensor, a, container sample, b, container sample bracket. DETAILED DESCRIPTION

[0032] The utility model will be further explained below with the drawings and examples.

[0033] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used in this paper have the same meaning as that generally understood by ordinary skilled persons in the technical field to which the utility model belongs.

[0034] In the present implementation, a device for testing water vapor permeability by weight method is proposed, as shown in Figure 1 and Figure 2 It includes an integrated moisture generation system 12 and a test bin 4, the gas inlet port of the moisture generation system 12 is connected with the gas source 1 through a first pipeline, and the gas outlet port of the moisture generation system 12 is communicated with the first gas inlet port of the gas jet pipe 5 through the first valve 11 (one-way valve in the present embodiment);

[0035] The second gas inlet port of the gas jet pipe 5 is communicated with the gas source 1 through a second pipeline, and a through hole is formed in the side wall of the gas jet pipe 5 to communicate with the test bin 4;

[0036] At least one second valve 3 (moisture valve) is connected on the first pipeline, and at least one third valve 2 (dry gas valve) is connected on the second pipeline, a tray connected with the rotation lifting system 13 is arranged in the test bin 4, in the present embodiment, the tray is used to carry the moisture cup 8 with the sample installed, and a weighing tray of the weighing system 14 is arranged in the test bin 4.

[0037] The integrated arrangement of the present embodiment refers to the arrangement of the test chamber 4 and the moisture generation system 12 in an up-down manner, and a unified outer wall is adopted, the bottom wall of the test chamber 4 serves as the top wall of the moisture generation system 12, the outer wall of the test chamber 4 and the outer wall of the liquid chamber of the moisture generation system 12 are integrally formed and arranged, and are integrated into a whole structure.

[0038] In the present embodiment, the liquid chamber of the moisture generation system 12 is provided with a space for the lifting shaft of the rotating lifting system 13 and the connecting rod of the weighing system 14 (i.e. the connecting rod between the body of the weighing system 14 and the weighing tray) to pass through, and the rotating lifting system 13 and the weighing system 14 of the present embodiment are respectively fixedly connected with the heat preservation layer, the rotating lifting system 13 and the liquid chamber are isolated from each other, and the weighing system 14 and the liquid chamber are isolated from each other, so as to avoid the influence of the moisture generation system 12 on the working of the rotating lifting system 13 and the weighing system 14.

[0039] The one-way valve of the present embodiment can also be replaced by a valve capable of controlling one-way air flow, such as a hydraulic one-way valve, a solenoid valve, an electromagnetic pulse valve, a servo proportional valve, etc., and those skilled in the art can select according to specific needs as long as one-way air flow control can be achieved. Here, no further description is given.

[0040] In the present embodiment, specifically, a certain amount of distilled water or desiccant is added to the moisture permeable cup 8, the moisture permeable cup 8 is sealed with a sample, and the sealed moisture permeable cup 8 is placed on the rotating lifting system 13. A plurality of the above-mentioned moisture permeable cups 8 can be placed on the rotating lifting system 13, and the rotating lifting system 13 can also make different moisture permeable cups 8 on the weighing tray of the weighing system 14 by rotating.

[0041] In the present embodiment, the moisture generation system 12 comprises a liquid chamber, a liquid level sensor 16 is fixed in the liquid chamber, and the upper gas space in the liquid chamber is communicated with the first pipeline through the gas inlet port of the moisture generation system 12.

[0042] The liquid port at the bottom of the liquid chamber is used to communicate with the water storage container through the liquid pipeline, and the upper gas space in the liquid chamber is communicated with the gas jet pipe 5 through the one-way valve.

[0043] In the present embodiment, a temperature and humidity sensor 6 is connected in the test chamber 4, a heat preservation layer is arranged on the outer side wall of the test chamber 4 and the moisture generation system 12, and a temperature control system 9 is arranged in the heat preservation layer. The temperature control system 9 here can adopt a water bath pipeline, or adopt a heating belt and a semiconductor refrigeration sheet. The existing temperature control mode can be adopted here, and no further description is given here.

[0044] In the present implementation, according to the data collected by the temperature and humidity sensor 6, the temperature control system 9 controls the temperature inside the test chamber 4, and the humidity generation system 12 controls the humidity inside the test chamber 4. When the liquid level sensor 16 detects that the water level in the humidity generation system 12 is low, the water pump 15 starts to work to transport water from the external water storage container to the humidity generation system 12 until the water level reaches the required position for the test.

[0045] In the present implementation, after the sample installed on the moisture permeable cup 8 is subjected to a certain time in the constant temperature and humidity environment in the test chamber 4, water vapor will permeate through the sample, causing the weight of the moisture permeable cup 8 as a whole to change. At this time, the weighing system 14 weighs the moisture permeable cup 8 again, and the difference between the two weight values obtained by the weighing system 14 can be used to calculate the water vapor transmission rate of the sample under the temperature and humidity.

[0046] In the present implementation, a fan 7 is connected in the test chamber 4, and the air inside the test chamber 4 is stirred by the air speed adjustment system to form a sweeping gas flow with the same air speed above the moisture permeable cup 8 to flow through the surface of the sample, and at the same time, the temperature and humidity in the test chamber 4 are uniform. At this time, the weighing system 14 weighs the moisture permeable cup 8 as a whole.

[0047] More specifically, the fan 7 is connected at the top center position in the test chamber 4, and the fan 7 takes in air from the axial air inlet and blows air to the surrounding of the fan from the air outlet on the fan, which is used to form a uniform and adjustable test air speed zone in the test chamber 4.

[0048] In the present implementation, an exhaust port 10 is provided at the bottom of the test chamber 4, and a valve is arranged on the exhaust port 10.

[0049] The working method of the device for testing water vapor transmission rate by weight method proposed in the present implementation includes:

[0050] First, start the temperature control system 9, heat or cool according to the actual temperature collected by the temperature and humidity sensor 6, and control the temperature in the test chamber 4 to the required temperature for the test; at the same time, the fan 7 starts to work, sends out the required air speed for the test, and stirs the gas in the test chamber 4. The air circulation mode is as shown by the double-dot dashed arrow in the figure. Figure 1

[0051] After the temperature in the test chamber 4 stabilizes for a period of time, the second valve 3 and the third valve 2 act according to the actual humidity collected by the temperature and humidity sensor 6, and send out dry gas through the gas jet pipe 5 or send out wet gas by sequentially passing through the humidity generation system 12, the one-way valve, and then the gas jet pipe 5, so as to control the humidity in the test chamber 4 to the required humidity for the test, form a stable humidity difference between the inside of the moisture permeable cup 8 with the installed sample and the test chamber 4, and the exhaust gas in the test chamber 4 can be discharged through the exhaust port 10. ​

[0052] When the temperature and humidity reach the required conditions for the test, the sample-transmitting cup 8 with the sample installed is weighed once, at this time, the rotating lifting system 13 is lowered, so that the sample-transmitting cup 8 with the sample installed falls on the weighing system 14 and the weight is recorded (as shown in FIG. 5) ; after the weighing is completed, the rotating lifting system 13 is raised, so that the sample-transmitting cup 8 with the sample installed is separated from the weighing tray of the weighing system 14; Figure 2

[0053] The sample-transmitting cup 8 with the sample installed is allowed to stand in the constant temperature and humidity environment for a certain period of time, so that the moisture is stably transmitted through the sample; the sample-transmitting cup 8 with the sample installed is weighed once again, and the weight is recorded, which is compared with the weight recorded before, so that the weight difference is obtained, and finally the water vapor transmission rate of the sample at this temperature and humidity can be obtained;

[0054] During the test, when the liquid level sensor 16 monitors that the water level in the moisture generating system 12 is low, the water pump 15 is started to pump distilled water in the external water storage container to the moisture generating system 12, and when the liquid level sensor 16 monitors that the water level reaches the required height, the water pump 15 stops pumping water.

[0055] As shown in Figure 3 and Figure 4 When the water vapor transmission rate test of the container sample a is performed, the tray is used to carry the container sample a through the container sample carrier b, and the specific working method is not described again.

[0056] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.​

Claims

1. A device for testing water vapor transmission rate by gravimetric method, characterized in that: include: An integrated moisture generating system and a test chamber, wherein the moisture generating system has an air inlet port connected to a gas source via a first pipeline, and the moisture generating system has an air outlet port connected to a first air inlet port of a gas nozzle via a first valve; The second gas inlet port of the gas nozzle is used to communicate with the gas source through a second pipeline, and a gas outlet hole connected to the test chamber is arranged on the side wall of the gas nozzle; At least one second valve is connected to the first pipeline, at least one third valve is connected to the second pipeline, a tray connected to the rotary lifting system is arranged in the test chamber, and a weighing tray of the weighing system is arranged in the test chamber.

2. The device for testing water vapor transmission rate by gravimetric method according to claim 1, characterized in that: The moisture generating system comprises: a liquid tank, a liquid level sensor is fixed in the liquid tank, and the upper gas space in the liquid tank is connected to the first pipeline through the air inlet port of the moisture generating system; The liquid port at the bottom of the liquid bin is used to communicate with the water storage container through a liquid pipeline, and the upper gas space in the liquid bin is communicated with the gas nozzle through a first valve.

3. The device for testing water vapor transmission rate by gravimetric method according to claim 1, characterized in that: An exhaust port is provided at the bottom of the test chamber, and a valve is arranged on the exhaust port.

4. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: A temperature and humidity sensor is connected to the test chamber, and a fan is connected to the top center of the test chamber. The fan takes in air from an axial air inlet and blows air around the fan from an air outlet on the fan, so as to form a uniform and adjustable test wind speed zone in the test chamber.

5. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: An insulation layer is arranged on the outer side walls of the test chamber and the moisture generating system, and a temperature control system is arranged in the insulation layer.

6. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: The first valve is a one-way valve or an intelligent valve capable of controlling the one-way flow of air.

7. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: The bottom wall of the test chamber serves as the top wall of the moisture generating system.

8. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: The tray is used for carrying the moisture permeable cup.

9. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: The tray is used for carrying container samples via the container sample holder.

10. The device for testing water vapor transmission rate by gravimetric method according to claim 1, 2 or 3, characterized in that: The rotary lifting system and the weighing system are fixedly connected to the thermal insulation layer respectively. The rotary lifting system and the liquid bin are isolated from each other, and the weighing system and the liquid bin are isolated from each other.

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