Air tightness testing device and testing method

Abstract

The invention relates to an air tightness testing device and a testing method, and provides a detection method capable of quickly evaluating the sealing performance of a high-gas-yield bottle cap by simulating the characteristic of fermentation gas production of filled contents and detecting the pressure resistance of a screw-off cap, so that the blank of a screw-off cap detection method is filled. The air tightness testing device has the advantages of being capable of controlling the pressure applied to the interior of the to-be-tested container, simulating the flatulence state of a fermentation product, and being suitable for air tightness testing of the fermentation can.

Description

Technical Field

[0001] The invention relates to the technical field of container air tightness testing equipment, in particular to an air tightness testing device and a testing method. Background Art

[0002] At present, the industry's testing method for the sealing performance of twist-off caps is to refer to the national standard GB / T29335 for claw-type twist-off caps. Pour 70-85°C vegetable oil into a preheated sample bottle and fill it to 5-10mm away from the bottle mouth. Immediately seal the sample bottle. After hot filling or sterilization and cooling, use the principle of thermal expansion and contraction to form a negative pressure vacuum state inside the can. Place the can upside down on filter paper for 24 hours to observe whether there is oil leakage.

[0003] However, this test method takes a long time and is mostly suitable for canned products that contain stable products. Traditional fermented bean curd products and other canned products that undergo secondary fermentation do not contain a sterilization process during the production process, so the yeast is still alive when bottled, and its reproduction ability can only be suppressed by the addition of salt seasoning. The interior of the can is initially at normal pressure. After bottling and capping, the fermented bean curd will continue to ferment slowly to produce gas, and pressure will gradually accumulate in the gap at the top of the can. Finally, due to the high pressure in the can, the air in the top gap will slowly seep out during storage and transportation, bringing out some of the liquid content and causing oil stains on the outside of the glass bottle mouth and the bottle body.

[0004] Therefore, the conventional twist-off cap sealing performance test method is only applicable to the evaluation under the vacuum state inside the can, and is not applicable to the twist-off cap evaluation method for fermentation and gas production cans. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a reasonably structured airtightness testing device and testing method, which are suitable for airtightness testing of fermentation gas-producing cans.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An air tightness test method, applicable to the air tightness test of a fermentation gas production container, comprises the following steps:

[0008] Step 1: Fill the designated container with simulated liquid to the designated level.

[0009] Step 2: Seal the test cap onto the container.

[0010] Step 3: Connect the needle to the container and connect it to the external air source.

[0011] Step 4: Place the assembled closed container into a water environment.

[0012] Step 5: Start pressurizing and inflating the closed container according to the expected parameters; when continuous bubbles are observed at the seal between the test cap and the container mouth, the pressure value at this time is the pressure resistance value of the test container.

[0013] As a further improvement of the above technical solution:

[0014] In the first step, the amount of simulant liquid filled is less than the container capacity.

[0015] In the second step, the threaded sealing connection between the test cap and the container mouth is achieved.

[0016] In the third step, the puncture needle penetrates the test cover and enters the container, and the puncture needle and the test cover are screwed and sealed.

[0017] The interface of the puncture needle is connected to the air pipe of the air source, and the interface of the puncture needle and the air pipe are sealed.

[0018] The parameters of the gas source output pressure simulate the fermentation gas production pressure, specifically:

[0019] Test pressure range 0-1.6Mpa,

[0020] The pressure gauge is graduated at 0.05Mpa.

[0021] During the test, the relative position of the test container in the water environment remains constant.

[0022] An air tightness testing device for an air tightness testing method comprises an air supply system and an observation device.

[0023] The air supply system comprises an air source, a flexible air tube is led out from the air source, and a needle is connected to one end of the air outlet of the air tube.

[0024] The observation device comprises a water tank, the water tank is provided with a base and a tank cover, and an air pipe is arranged through the tank cover.

[0025] As a further improvement of the above technical solution:

[0026] The gas supply system and observation device are independent of each other.

[0027] The air pipe adopts a multi-branch structure, and each branch corresponds to a container to be tested.

[0028] The beneficial effects of the present invention are as follows:

[0029] The invention simulates the characteristics of gas production by fermentation of filling contents, and provides a detection method for quickly evaluating the sealing performance of high-gas-producing bottle caps by detecting the pressure resistance performance of twist-off caps, thus filling the blank of twist-off cap detection methods.

[0030] In the present invention, a needle is used to gradually add gas into the container at a specified low pressure to simulate the flatulence process of the fermentation product during gradual fermentation. However, this simulation process is equivalent to speeding up the actual fermentation gas production rate, so the simulation rate can be accelerated in a shorter time. When the internal pressure of the container increases to the point where bubbles emerge, a single bubble may be residual gas in the sealed part, and continuous bubbles prove that the internal pressure of the container is too high to be sealed, and at this time it can be considered that the internal pressure has reached the withstand pressure value. This test method is accurate and reliable, and can use a single air pipe or multiple air pipes to test one or more containers to be tested according to actual needs, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a test flow chart of the present invention.

[0032] Figure 2 It is a three-dimensional diagram of the device of the present invention.

[0033] Figure 3 It is the front view of the device of the present invention.

[0034] Figure 4 It is a schematic diagram of the cooperation between the container and the test cover in the present invention.

[0035] Figure 5 It is a top view of the device of the present invention.

[0036] Among them: 1. Container; 2. Test cover; 3. Air supply system; 4. Observation device;

[0037] 301, air source; 302, trachea; 303, needle;

[0038] 401. Water tank; 402. Base; 403. Tank cover. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0040] like Figure 1-Figure 5 As shown, the air tightness test method of this embodiment is applicable to the air tightness test of the fermentation gas production container 1, and includes the following steps:

[0041] Step 1: Fill the designated container 1 with the simulated liquid to the designated level.

[0042] Step 2: seal the test cover 2 onto the container 1,

[0043] Step 3: Insert the needle 303 into the container 1, and connect the needle 303 to the external air source 301.

[0044] Step 4: Place the assembled closed container 1 into a water environment.

[0045] Step 5: Start pressurizing and inflating the closed container 1 according to the expected parameters; when continuous bubbles are observed at the seal between the test cover 2 and the mouth of the container 1, the pressure value at this time is the pressure resistance value of the test container 1.

[0046] In the first step, the amount of simulant liquid filled is less than the capacity of container 1.

[0047] In the second step, the test cap 2 is thread-sealed to the mouth of the container 1 .

[0048] In the third step, the puncture needle 303 penetrates the test cover 2 and enters the container 1, and the puncture needle 303 and the test cover 2 are screwed and sealed.

[0049] The interface of the puncture needle 303 is connected to the air pipe 302 of the air source 301 , and the interface of the puncture needle 303 and the air pipe 302 are sealedly connected.

[0050] The parameters of the pressure gas output by the gas source 301 simulate the fermentation gas production pressure, specifically:

[0051] Test pressure range 0-1.6Mpa,

[0052] The pressure gauge is graduated at 0.05Mpa.

[0053] During the test, the relative position of the test container 1 in the water environment remains constant.

[0054] The air tightness testing device for the air tightness testing method of this embodiment includes an air supply system 3 and an observation device 4.

[0055] The gas supply system 3 includes a gas source 301, a flexible gas pipe 302 is led out from the gas source 301, and a needle 303 is connected to one end of the gas outlet of the gas pipe 302.

[0056] The observation device 4 includes a water tank 401 , which has a base 402 and a tank cover 403 , and the air pipe 302 is arranged through the tank cover 403 .

[0057] The gas supply system 3 and the observation device 4 are independent of each other.

[0058] The air pipe 302 adopts a multi-branch structure, and each branch corresponds to a container 1 to be tested.

[0059] The specific working principle of the present invention is as follows:

[0060] like Figure 1 As shown, it is a schematic diagram of the workflow of the present invention. Figure 2 , Figure 3 , Figure 5The device provided by the present invention includes an air supply system 3 and an observation device 4. The air supply system 3 includes an air source 301. An air pipe 302 is led out from the air source 301. The air pipe 302 is connected to a puncture needle 303. The puncture needle 303 and the test cover 2 can be rotatably connected to a sealed connection state to ensure that there is no possibility of leakage except between the container 1 and the test cover 2. Alternatively, the sealing state between the puncture needle 303 and the test cover 2, such as the sealing degree of the threaded seal is greater than the sealing degree between the container 1 and the test cover 2, that is, the pressure resistance value between the puncture needle 303 and the test cover 2 is much greater than the pressure resistance value of the space formed between the container 1 and the test cover 2, so it is not easy to destroy the sealing state between the puncture needle 303 and the test cover 2 when testing the sealing degree between the container 1 and the test cover 2.

[0061] After the test cover 2 and the puncture needle 303 are assembled, a container 1 with contents and air to be tested is obtained, and the container 1 is placed in a water environment, and the relative position is kept unchanged during the test to prevent the external water pressure from affecting the test results. The container 1 is placed at the bottom of the water environment, and when continuous bubbles emerge, the path of the bubbles in the water can be visually seen, which is convenient for timely observation of the corresponding instantaneous pressure.

[0062] The method of the invention is easy to operate, can be used as a conventional detection method for unscrewing caps of high-gas-producing fillings, quickly evaluates the sealing performance of bottle caps, and avoids complaints about leakage of batches of finished products.

[0063] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. An air tightness testing method, characterized in that: The method is applicable to the air tightness test of a fermentation gas production container (1), comprising the following steps: Step 1: Fill the designated container (1) with simulated liquid to a designated level. Step 2: seal the test cover (2) onto the container (1), Step 3: insert the needle (303) into the container (1), and connect the needle (303) to the external air source (301). Step 4: place the assembled closed container (1) into a water environment. Step 5: Start pressurizing and inflating the closed container (1) according to the expected parameters; when continuous bubbles are observed at the seal between the test cover (2) and the mouth of the container (1), the pressure value at this time is the pressure resistance value of the test container (1).

2. The airtightness testing method according to claim 1, characterized in that: In the first step, the amount of the simulant liquid filled is less than the capacity of the container (1).

3. The airtightness testing method according to claim 1, characterized in that: In the second step, the test cap (2) is threadedly sealed to the mouth of the container (1).

4. The airtightness testing method according to claim 1, characterized in that: In the third step, the puncture needle (303) penetrates the test cover (2) and enters the container (1), and the puncture needle (303) and the test cover (2) are screwed and sealed.

5. The airtightness testing method according to claim 4, characterized in that: The interface of the puncture needle (303) is connected to the air pipe (302) of the air source (301), and the interface of the puncture needle (303) and the air pipe (302) are sealed.

6. The airtightness testing method according to claim 1, characterized in that: The parameters of the pressure gas output by the gas source (301) simulate the fermentation gas production pressure, specifically: Test pressure range 0-1.6Mpa, The pressure gauge is graduated at 0.05Mpa.

7. The air tightness testing method according to any one of claims 1 to 6, characterized in that: During the test, the relative position of the test container (1) in the water environment remains constant.

8. An airtightness testing device for use in the airtightness testing method of claim 1, characterized in that: It comprises a gas supply system (3) and an observation device (4), The air supply system (3) comprises an air source (301), a flexible air tube (302) extending from the air source (301), and a needle (303) connected to one end of the air outlet of the air tube (302). The observation device (4) comprises a water tank (401), wherein the water tank (401) has a base (402) and a tank cover (403), and an air pipe (302) is arranged through the tank cover (403).

9. The testing device according to claim 8, characterized in that: The gas supply system (3) and the observation device (4) are independent of each other.

10. The testing device according to claim 8, characterized in that: The air pipe (302) adopts a multi-branch structure, and each branch corresponds to a container (1) to be tested.

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