Flexible packaging bag sealing detection device and method

Abstract

The present invention discloses a flexible packaging bag sealing detection device and method, including: a vacuum module, a gas-liquid co-injection module, a leakage critical part, a gas leakage judgment module and a liquid seepage detection module. The flexible packaging bag is evacuated, filled with liquid, and a certain gas pressure is applied at the same time. A leakage critical part is connected to one end of the flexible packaging bag, and the leakage critical part can discharge gas but not liquid. During the test, only one part of the leakage critical part is allowed to release gas. According to the detection data of the leakage critical part, the theoretical air pressure in the flexible packaging bag is calculated, and compared with the actual air pressure to determine whether there is a small gas leakage on the surface of the flexible packaging bag. Through the above method, the present invention can detect gas leakage that cannot be detected in the prior art, and the sealing detection of the flexible packaging bag is more comprehensive and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing test, and in particular to a flexible packaging bag sealing detection device and method. Background Art

[0002] Flexible packaging bags refer to packaging materials that can be bent, folded and have a certain degree of elasticity. They are usually made of soft materials, which make them extremely flexible and plastic, and can adapt to the packaging needs of items of different shapes, sizes and weights.

[0003] The urine collection bag is a flexible packaging bag made of plastic. It is a medical device for collecting urine. It is widely used in hospitals, nursing homes, home care, and patients with limited mobility or long-term bedridden. It is used to collect and store urine discharged by the human body for subsequent treatment or discharge. As a medical device, the sealing of the urine collection bag is the basis for ensuring the normal operation of the product. A well-sealed urine collection bag can effectively prevent urine leakage, thereby ensuring that the collection, storage and discharge functions of the product can be realized. In addition, the urine collection bag is usually in direct contact with the patient's body, so its sealing performance is directly related to the patient's safety and comfort. If there is a sealing defect in the urine collection bag, urine may penetrate into the patient's skin or clothing, causing discomfort or infection. In addition, the leaked urine may also pollute the environment and increase the difficulty of cleaning and care. Therefore, sealing testing of flexible packaging bags such as urine collection bags is an important measure to ensure patient safety.

[0004] At present, the existing method for testing the sealing property of a flexible packaging bag such as a urine collection bag is as follows: after the flexible packaging bag is filled with colored water, it is placed between two parallel plates, and then pressure is applied to the parallel plates to visually inspect the leakage of the flexible packaging bag.

[0005] However, the above prior art has the following problems:

[0006] (1) The prior art uses two opposing hard flat plates for extrusion, which may cause the leaking part of the flexible packaging bag to be in close contact with the hard flat plates, resulting in the risk that the liquid cannot pass through the leaking part, and the detection is not accurate enough.

[0007] (2) The gas leakage problem of the flexible packaging bag cannot be detected. Although the gas leakage may not cause the liquid to leak out immediately, it may cause the internal pressure of the flexible packaging bag to change in the long term, affecting the sealing effect.

[0008] Therefore, it is necessary to provide a flexible packaging bag sealing detection device and method to solve the above technical problems. Summary of the invention

[0009] The present invention overcomes the deficiencies of the prior art and provides a flexible packaging bag sealing detection device and method.

[0010] To achieve the above object, the technical solution adopted by the present invention is: a flexible packaging bag sealing detection method, comprising the following steps:

[0011] S1. Sealing the drainage pipe at the bottom of the flexible packaging bag and performing vacuum treatment on the flexible packaging bag;

[0012] S2, injecting liquid into the vacuumed flexible packaging bag, and at the same time filling the flexible packaging bag with gas at a rate of 100 to 200 ml / min;

[0013] S3, releasing the seal of the discharge pipe, and connecting a leakage critical part at the interface of the discharge pipe; the leakage critical part only allows gas to pass through, and is used to detect the internal air pressure of the flexible packaging bag and the air pressure released through the leakage critical part;

[0014] S4. Based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part, calculate whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure 2 to 60 seconds after the leakage critical part releases gas. If the two are inconsistent, it indicates that there is a small gas leakage on the surface of the flexible packaging bag; at the same time, use visual inspection or absorbent material covering technology to detect the possible liquid seepage on the surface of the flexible packaging bag and its specific location;

[0015] The calculation process in S4 includes:

[0016] The inflation rate is R in， After inflation, the air pressure in the flexible packaging bag is P i , the volume is V;

[0017] The release rate of gas through the leaking critical part R out , the time t of gas release;

[0018] According to the ideal gas law , where n is the number of moles of gas, R is the ideal gas constant, and T is the temperature; since the air pressure in the flexible packaging bag reaches P i After that, the volume V and temperature T remain basically unchanged, and we get:

[0019] The number of moles of gas released through the leaking critical part ;

[0020] The number of moles of gas added by inflation simultaneously ;

[0021] After time t, the theoretical air pressure in the flexible packaging bag is ;

[0022] The actual air pressure in the flexible packaging bag after the leakage critical part detects time t is P1. When the pressure is too high, there is gas leakage on the surface of the flexible packaging bag.

[0023] In a preferred embodiment of the present invention, in S1, before sealing the liquid discharge pipe, air is firstly pumped from the liquid inlet pipe or the liquid discharge pipe for 5 to 10 seconds, and then inflated for 5 to 10 seconds, and after 2 to 5 reciprocating cycles, the liquid discharge pipe is then sealed.

[0024] In a preferred embodiment of the present invention, in said S1, the vacuum degree of the flexible packaging bag is set to -20 to -50 kPa.

[0025] In a preferred embodiment of the present invention, in said S2, the amount of liquid added to the flexible packaging bag is 70% to 75% of the test volume of the flexible packaging bag.

[0026] In a preferred embodiment of the present invention, in said S2, the added liquid is a colored liquid.

[0027] In a preferred embodiment of the present invention, in S2, the gas filled is nitrogen, and the maximum air pressure in the flexible packaging bag is controlled to be 85% to 90% of the air pressure at which the flexible packaging bag ruptures.

[0028] In a preferred embodiment of the present invention, in said S4, the water-absorbing material is a white paper towel or gauze, and after the water-absorbing material is attached to the surface of the flexible packaging bag for 2 to 60 seconds, the water-absorbing material is checked for any signs of leakage.

[0029] A flexible packaging bag sealing detection device, using any one of the flexible packaging bag sealing detection methods described above, comprising:

[0030] A vacuum module for vacuuming the flexible packaging bag;

[0031] The gas-liquid co-injection module is used to inject liquid into the vacuumed flexible packaging bag and simultaneously fill the flexible packaging bag with gas at a rate of 100-200 ml / min;

[0032] A leakage critical part is connected to the discharge pipe interface to detect the internal air pressure of the flexible packaging bag and the rate of gas released through the leakage critical part;

[0033] The gas leakage judgment module calculates whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part. If the two do not match, it indicates that there is a small gas leakage on the surface of the flexible packaging bag;

[0034] The liquid seepage detection module uses visual inspection or absorbent material covering technology to detect possible liquid seepage on the surface of flexible packaging bags and its specific location.

[0035] In a preferred embodiment of the present invention, the leakage critical part comprises: a shell, a microporous membrane arranged in the middle of the shell, a first air pressure sensor arranged on the upper part of the microporous membrane, and a second air pressure sensor arranged on the lower part of the microporous membrane; a connecting structure is arranged on the inner side of the shell, and is connected to the drain pipe through the connecting structure; the microporous membrane is used to block the liquid and allow the gas to pass through;

[0036] The first air pressure sensor extends inside the flexible packaging bag to detect the air pressure inside the flexible packaging bag;

[0037] The second air pressure sensor detects the rate of released gas passing through the microporous membrane.

[0038] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0039] The present invention provides a flexible packaging bag sealing detection device and method, which is implemented by evacuating a flexible packaging bag, filling it with liquid, and applying a certain gas pressure at the same time, and connecting a leakage critical part at one end of the flexible packaging bag, the leakage critical part can discharge gas but not liquid. During the test, only one part of the leakage critical part is allowed to release gas, and the theoretical air pressure in the flexible packaging bag is calculated based on the detection data of the leakage critical part, and compared with the actual air pressure to determine whether there is a tiny gas leakage on the surface of the flexible packaging bag. Through the above method, the present invention can detect gas leakage that cannot be detected in the prior art, and the sealing detection of the flexible packaging bag is more comprehensive and accurate.

[0040] The present invention injects inert gas into the flexible packaging bag at a certain rate while injecting liquid into the flexible packaging bag, and makes it reach a certain gas pressure in the flexible packaging bag. The gas applies pressure to the liquid, so that the liquid can pass through the leaking part on the surface of the flexible packaging bag more easily, thereby detecting the leaking point more quickly. This solves the risk in the prior art that the leaking part of the flexible packaging bag is closely contacted with the hard flat plates by using two opposite hard flat plates for extrusion, so that the liquid cannot pass through the leaking part. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, it is to be understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] The present invention is mainly used in the field of sealing detection of flexible packaging bags such as urine collection bags, which have both liquid inlet and outlet tubes / ports and are used to continuously collect or store liquids in medical treatment. This type of flexible packaging bag is significantly different from one-time filling packaging. They need to be connected to the human body for a long time or for a period of time during the medical process, so their sealing is particularly important.

[0046] In medical practice, flexible packaging bags such as urine collection bags are widely used to collect patients' urine, thereby helping doctors monitor key indicators such as urine volume, urine color and texture. These packaging bags not only provide convenience for patients, but also reduce the workload of medical staff. However, if the sealing of the packaging bag is not good, urine leakage may occur, which will not only contaminate the patient's clothing and bed sheets, but also cause cross infection, increase the patient's pain and medical risks.

[0047] In order to ensure the safety and comfort of patients, the present invention provides a flexible packaging bag sealing detection method, comprising the following steps:

[0048] S1. Sealing the drainage pipe at the bottom of the flexible packaging bag;

[0049] S2, injecting liquid into the vacuumed flexible packaging bag, and at the same time filling the flexible packaging bag with gas at a rate of 100 to 200 ml / min;

[0050] S3, releasing the seal of the discharge pipe, and connecting a leakage critical part at the interface of the discharge pipe; the leakage critical part only allows gas to pass through, and is used to detect the internal air pressure of the flexible packaging bag and the air pressure released through the leakage critical part;

[0051] S4. Based on the internal air pressure, inflation rate and gas release rate of the leakage critical part of the flexible packaging bag, calculate whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure 2 to 60 seconds after the leakage critical part releases gas. If the two are inconsistent, it indicates that there is a small gas leakage on the surface of the flexible packaging bag. At the same time, visual inspection or absorbent material covering technology is used to detect possible liquid seepage on the surface of the flexible packaging bag and its specific location.

[0052] The present invention draws a vacuum in a flexible packaging bag, fills it with liquid, and applies a certain gas pressure at the same time, and connects a leakage critical part at one end of the flexible packaging bag, which can discharge gas but not liquid; under the action of gas pressure, liquid can pass through the leakage of the flexible packaging bag more easily, and whether there is liquid seepage on the surface of the flexible packaging bag can be quickly detected by visual detection and other means. The connected leakage critical part can also detect the internal air pressure of the flexible packaging bag, and calculate whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time according to the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part. If they are not consistent, there is a small gas leakage on the surface of the flexible packaging bag.

[0053] The above steps are described in detail below.

[0054] In step S1, before sealing the liquid discharge pipe, air is firstly pumped from the liquid inlet pipe or the liquid discharge pipe for 5 to 10 seconds, and then inflated for 5 to 10 seconds, and after 1 to 5 reciprocating cycles, the liquid discharge pipe is sealed.

[0055] That is to say, before sealing the drain pipe, first use a fan to connect the inlet pipe or the drain pipe, and keep the unconnected side in a ventilated state, then first evacuate the flexible packaging bag for 5 to 10 seconds, and the gas passes through the flexible packaging bag to take away the impurities inside the flexible packaging bag, and then inflate the flexible packaging bag for 5 to 10 seconds to open the adhesion of the inner wall of the flexible packaging bag, and blow the impurities inside the flexible packaging bag off the inner wall of the flexible packaging bag, and repeat 1 to 5 times. The number of cycles of this step is determined according to the actual cost control of the test, preferably 2 times. Through these steps, the clean state of the inside of the flexible packaging bag is guaranteed.

[0056] In step S1, the drainage pipe at the bottom of the flexible packaging bag is sealed. After sealing, the flexible packaging bag is vacuum treated, and the vacuum degree is set to -20 to -50 kPa.

[0057] That is to say, the drainage pipe at the bottom of the flexible packaging bag is sealed, and the sealing is achieved by closing the drainage valve, installing the drainage pipe cover, etc. to ensure that it is impermeable to liquids and gases. Determine whether to perform vacuum treatment based on the sealing requirements of the flexible packaging bag. Under high standards and high requirements, use a vacuum pump to perform vacuum treatment on the inside of the flexible packaging bag, and the vacuum degree is set to -20 to -50kPa to ensure that there is no residual air inside the flexible packaging bag, and to ensure that the flexible packaging bag will not be excessively deformed, reducing the impact on subsequent sealing detection steps.

[0058] In step S2, liquid is injected into the vacuumed flexible packaging bag, and gas is simultaneously filled into the flexible packaging bag at a rate of 100 to 200 ml / min.

[0059] That is to say, a certain amount of liquid is slowly injected into the flexible packaging bag through the liquid inlet tube of the flexible packaging bag. The amount of liquid injected is 70% to 75% of the test volume of the flexible packaging bag. Testing at a state close to but not exceeding the maximum capacity can more accurately evaluate the sealing of the flexible packaging bag and help ensure that the flexible packaging bag can meet the needs of patients in actual use. While injecting liquid, gas is filled into the flexible packaging bag at a rate of 100 to 200 ml / min. The rate of liquid injection must exceed the rate of gas injection.

[0060] Further, the liquid injected into the flexible packaging bag is a colored liquid. The colored liquid is for the convenience of observing and detecting whether the flexible packaging bag has leakage. The colored liquid can clearly show the position and degree of leakage, thereby ensuring that the sealing performance of the flexible packaging bag meets the standard requirements. The colored liquid used is prepared by adding a certain amount of food coloring to water, such as adding 0.3 grams of erythrosine to each liter of water to make the colored liquid. Other pigments can also be used to prepare colored liquids, such as carmine, lemon yellow, sunset yellow, amaranth and brilliant blue, etc., for easy observation of leakage.

[0061] Furthermore, the gas filled is nitrogen, and the solubility of nitrogen in water is very low and almost negligible. Therefore, using nitrogen as the filling gas in the sealing test of flexible packaging bags avoids the gas dissolving in the liquid and affecting the test results. Flexible packaging bags are made of soft, lightweight and durable materials, and common materials include polyethylene (PE) or polypropylene (PP) and the like. When the flexible packaging bag is continuously inflated, after a certain air pressure is reached in the flexible packaging bag, it will expand due to the elasticity of its material and exceed the rated volume of the flexible packaging bag, but the continuous expansion will cause the flexible packaging bag to rupture. The maximum air pressure in the flexible packaging bag of the present invention is controlled at 85% to 90% of the air pressure at which the flexible packaging bag ruptures, ensuring high air pressure in the flexible packaging bag, but not rupture, because this rupture will cause the sealing test to fail directly.

[0062] In step S3, the seal of the liquid discharge pipe is released, and a leakage critical part is connected to the interface of the liquid discharge pipe; the leakage critical part only allows gas to pass through, and is used to detect the internal air pressure of the flexible packaging bag and the air pressure released through the leakage critical part.

[0063] That is to say, when the air pressure in the flexible packaging bag reaches a certain level, that is, after the flexible packaging bag is fully expanded and exceeds the rated volume, the flexible packaging bag is continuously filled with gas. At this time, the seal of the liquid discharge pipe is released, and the leakage critical part is quickly connected, and the front end of the leakage critical part is inserted into the liquid discharge pipe. There is a channel in the leakage critical part, but only gas is allowed to pass through, and the liquid is blocked in the flexible packaging bag. In addition, the leakage critical part is also used to detect the internal air pressure of the flexible packaging bag and the rate of gas release through the leakage critical part, which is achieved through a gas / air pressure sensor and records the detection time.

[0064] In step S4, based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part, it is calculated whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time. If the two are inconsistent, it indicates that there is a small gas leakage on the surface of the flexible packaging bag. At the same time, visual inspection or absorbent material covering technology is used to detect possible liquid seepage on the surface of the flexible packaging bag and its specific location.

[0065] That is to say, during the test of the flexible packaging bag, only one place is allowed to release gas, that is, the leakage critical part. According to the detection data of the leakage critical part: the internal air pressure of the flexible packaging bag and the gas release rate of the leakage critical part, combined with the inflation rate into the flexible packaging bag, the theoretical air pressure in the flexible packaging bag after the leakage critical part releases gas for a certain period of time is calculated. The specific calculation process includes:

[0066] Assume the inflation rate is R in， After inflation, the air pressure in the flexible packaging bag is P i , the volume is V;

[0067] The rate of gas release through the leaking critical part R out , the time t of gas release;

[0068] According to the ideal gas law , where n is the number of moles of gas, R is the ideal gas constant (obtained from the table), and T is the temperature; since the air pressure in the flexible packaging bag reaches P i After that, the volume V and temperature T remain basically unchanged, and we can get:

[0069] The number of moles of gas released through the leaking critical part ;

[0070] The number of moles of gas added by inflation simultaneously ;

[0071] After time t, the theoretical air pressure in the flexible packaging bag is ;

[0072] The actual air pressure in the flexible packaging bag after the leakage critical part detects time t is P1. When the pressure is too high, there is gas leakage on the surface of the flexible packaging bag.

[0073] The present invention allows only one place to release gas during the test of the flexible packaging bag, that is, the critical leakage part. According to the detection data of the critical leakage part: the internal air pressure of the flexible packaging bag and the gas release rate of the critical leakage part, combined with the inflation rate into the flexible packaging bag, the theoretical air pressure in the flexible packaging bag after the critical leakage part releases gas for a certain period of time is calculated, and then compared with the actual air pressure detected by the critical leakage part. If the actual air pressure is lower than the theoretical air pressure, it means that there is a gas leakage position in the flexible packaging bag other than the critical leakage part. Through this method, gas leakage that cannot be detected in the prior art can be detected, and the sealing detection of the flexible packaging bag is more comprehensive and accurate.

[0074] Furthermore, an acceptable range is set according to the difference between the theoretical air pressure and the actual air pressure, and if the range is exceeded, it is determined that the sealing is poor.

[0075] Furthermore, while detecting gas leakage, visual detection or water-absorbing material covering technology is used to detect possible liquid seepage on the surface of the flexible packaging bag and its specific location.

[0076] That is, when performing the gas leakage detection in step S4, visual inspection (visual inspection or high-speed camera) is used to observe whether there is liquid seepage on the surface of the flexible packaging bag, or a water-absorbing material is attached to the surface of the flexible packaging bag to check whether the water-absorbing material has leakage signs, that is, signs of discoloration and deformation due to water absorption. Specifically, the water-absorbing material is a white paper towel or gauze, and the water-absorbing material is attached to the surface of the flexible packaging bag for 2 to 60 seconds, and then the water-absorbing material is checked for leakage signs.

[0077] The present invention injects inert gas into the flexible packaging bag at a certain rate while injecting liquid into the flexible packaging bag, and makes it reach a certain gas pressure in the flexible packaging bag. The gas applies pressure to the liquid, so that the liquid can pass through the leaking part on the surface of the flexible packaging bag more easily, thereby detecting the leaking point more quickly. This solves the risk in the prior art that the leaking part of the flexible packaging bag is closely contacted with the hard flat plates by using two opposite hard flat plates for extrusion, so that the liquid cannot pass through the leaking part.

[0078] The present invention also provides a flexible packaging bag sealing detection device, comprising:

[0079] The vacuum module is used to perform vacuum treatment on the flexible packaging bag. Specifically, it is a vacuum pump connected to the liquid inlet pipe of the flexible packaging bag, and the vacuum degree is set to -20 to -50 kPa.

[0080] The gas-liquid co-injection module is used to inject liquid into the flexible packaging bag after vacuum, and at the same time fill the flexible packaging bag with gas at a rate of 100-200ml / min; the injection head of the gas-liquid co-injection module is two nested pipes. The outer pipe is filled with gas, which is nitrogen. The inner pipe is injected with liquid, and the amount of liquid injected is 70%-75% of the test volume of the flexible packaging bag. In addition, the liquid used is a colored liquid, specifically, a certain amount of food coloring is added to water for preparation, such as adding 0.3 grams of erythrosine per liter of water to make a colored liquid.

[0081] The leakage critical part is connected to the interface of the drain pipe, allowing only the gas in the flexible packaging bag to pass through, detecting the internal air pressure of the flexible packaging bag and the gas rate released through the leakage critical part. The leakage critical part includes: a shell, a microporous membrane arranged in the middle of the shell, a first air pressure sensor arranged on the upper part of the microporous membrane, and a second air pressure sensor arranged on the lower part of the microporous membrane; a connecting structure is arranged on the inner side of the shell, connected to the drain pipe through the connecting structure, the connecting structure is a threaded head that matches the drain pipe, and can also be a locking hoop sleeved on the drain pipe, tightly connecting the leakage critical part to the drain pipe; the microporous membrane, preferably a polytetrafluoroethylene membrane, has uniformly distributed tiny pores, which allow gas molecules to pass through, but can block liquid molecules or larger particles. This is a prior art and will not be described in detail here. The first air pressure sensor extends inside the flexible packaging bag to detect the internal air pressure of the flexible packaging bag; the second air pressure sensor is arranged on the outside of the microporous membrane to detect the gas rate released through the microporous membrane.

[0082] The gas leakage judgment module calculates whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part. If the two are inconsistent, it indicates that there is a small gas leakage on the surface of the flexible packaging bag. The specific calculation process includes:

[0083] Assume the inflation rate is R in， After inflation, the air pressure in the flexible packaging bag is P i , the volume is V;

[0084] The rate of gas release through the leaking critical part R out , the time t of gas release;

[0085] According to the ideal gas law , where n is the number of moles of gas, R is the ideal gas constant (obtained from the table), and T is the temperature; since the air pressure in the flexible packaging bag reaches Pi After that, the volume V and temperature T remain basically unchanged, and we get:

[0086] The number of moles of gas released through the leaking critical part ;

[0087] The number of moles of gas added by inflation simultaneously ;

[0088] After time t, the theoretical air pressure in the flexible packaging bag is ;

[0089] The actual air pressure in the flexible packaging bag after the leakage critical part detects time t is P1. When the pressure is too high, there is gas leakage on the surface of the flexible packaging bag.

[0090] The liquid seepage detection module uses visual inspection or absorbent material covering technology to detect possible liquid seepage on the surface of the flexible packaging bag and its specific location. Specifically, during the operation of the gas leakage judgment module, visual inspection (visual inspection or high-speed camera) is used to observe whether there is liquid seepage on the surface of the flexible packaging bag, or absorbent material is applied to the surface of the flexible packaging bag to check whether the absorbent material has any signs of leakage, that is, signs of discoloration and deformation due to water absorption. Specifically, the absorbent material is a white paper towel or gauze. After the absorbent material is applied to the surface of the flexible packaging bag for 2 to 60 seconds, check whether the absorbent material has any signs of leakage.

[0091] The present invention provides a flexible packaging bag sealing detection device, which can perform sealing detection on the flexible packaging bag. The flexible packaging bag is vacuumed, filled with liquid, and a certain gas pressure is applied at the same time. A leakage critical part is connected at one end of the flexible packaging bag, and the leakage critical part can discharge gas but not liquid. Under the action of gas pressure, liquid can pass through the leakage of the flexible packaging bag more easily, and visual detection and other means can be used to quickly detect whether liquid seeps out of the surface of the flexible packaging bag. The connected leakage critical part can also detect the internal air pressure of the flexible packaging bag. According to the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part, it is calculated whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time. If they are not consistent, there is a small gas leakage on the surface of the flexible packaging bag. Example

[0092] Anti-reflux urine collection bags from different conventional production batches were used for sealing tests to provide a reliable verification and testing method. For each batch of 10 bags, the volume of the anti-reflux urine collection bags was 1500ml and the thickness was 0.5mm. 18 batches of test samples were used. The sealing test was first carried out using the test method specified in the GBT 17257.2-2009 standard. The specific steps are as follows:

[0093] 1. Use a measuring cylinder and a water supply device to inject erythrosine aqueous solution into the anti-reflux urine collection bag. The amount of water is 75% of the test volume, and make sure not to bring in air. The distance between the bottom of the water reservoir in the water supply device and the top of the anti-reflux urine collection bag is 500mm±5mm.

[0094] 2. Seal the liquid inlet pipe and drain hole.

[0095] 3. Place the absorbent material on a hard flat surface and place the anti-reflux urine collection bag horizontally on the absorbent material.

[0096] 4. Place a hard flat plate on top of the anti-reflux urine collection bag, limit the position with the limiter, and gradually apply pressure to the hard flat plate. The pressure applied to the anti-reflux urine collection bag should be 200N±10N.

[0097] 5. The force acting on the anti-reflux urine collection bag should be maintained for at least 1 minute, but not longer than 1 minute and 10 seconds. After unloading, visually inspect the anti-reflux urine collection bag and the white absorbent material for signs of leakage. If there are signs, the anti-reflux urine collection bag is considered to be leaking and marked with an X.

[0098] The above test used 18 batches of 180 anti-reflux urine collection bag test samples, and the results were statistically analyzed. After cleaning and drying, the samples were put into a flexible packaging bag sealing detection method of the present invention for sealing testing. The following are the test steps:

[0099] 1. Vacuum the liquid inlet tube for 5 seconds, then inflate for 5 seconds. Repeat this process three times. Then, use a vacuum pump to vacuum the inside of the urine collection bag to prevent reflux. The vacuum degree is set to -30 kPa.

[0100] 2. Slowly inject 1100 ml of erythrosine aqueous solution into the anti-reflux urine collection bag through the liquid inlet tube, and simultaneously fill the anti-reflux urine collection bag with nitrogen at a rate of 150 ml / min until the anti-reflux urine collection bag expands significantly.

[0101] 3. Keep filling the anti-reflux urine collection bag with nitrogen, release the seal on the drainage tube, quickly connect the leakage critical part, and start testing the internal air pressure of the anti-reflux urine collection bag and the gas release rate through the leakage critical part.

[0102] 4. Calculate whether the theoretical pressure in the anti-reflux urine collection bag is consistent with the actual pressure 45 seconds after the leakage critical part releases gas. If it is consistent, there is no gas leakage in the anti-reflux urine collection bag. If it is not consistent, there is a gas leakage, marked as Z, and the gas leakage detection results are recorded separately.

[0103] 5. Use a white paper towel to cover the surface of the anti-reflux urine collection bag. After completing step 4, observe whether the paper towel is wet or discolored. Otherwise, mark it with an X.

[0104] The sealing test results are summarized according to the test of GBT 17257.2-2009 standard, hereinafter referred to as the conventional test, and the test of a flexible packaging bag sealing detection method of the present invention, hereinafter referred to as the special test. The statistical results of the two test methods are summarized as shown in Table 1:

[0105]

[0106] Table 1. Test results of anti-reflux urine collection bag samples

[0107] It can be seen from Table 1 that in the test of anti-reflux urine collection bag samples, 5 test samples were found to have liquid leakage problems in the routine test, while in the special test, 7 test samples had liquid leakage problems and 9 test samples had gas leakage problems. At the same time, there were 7 samples marked with YZ, indicating that both liquid and gas leakage problems were detected, and two more gas leakage problems were detected, but there were no test samples with liquid leakage. Embodiment 2

[0108] The sealing test was performed using extracorporeal drainage bags from different conventional production batches to provide a reliable verification and testing method. For each batch of 10 bags, the volume of the extracorporeal drainage bags was 1000ml and the thickness was 0.3mm. 18 batches of test samples were used. The sealing test was first performed using the test method specified in the GBT 17257.2-2009 standard. The specific steps are as follows:

[0109] 1. Use a measuring cylinder and a water supply device to inject erythrosine aqueous solution into the extracorporeal drainage bag, with the water volume being 80% of the test volume, and ensure that no air is introduced. The distance between the bottom of the water reservoir in the water supply device and the top of the extracorporeal drainage bag is 500mm±5mm.

[0110] 2. Seal the liquid inlet pipe and drain hole.

[0111] 3. Place the absorbent material on a hard flat surface and place the extracorporeal drainage bag horizontally on the absorbent material.

[0112] 4. Place a hard plate on top of the extracorporeal drainage bag, limit the position with the limiter, and gradually apply pressure to the hard plate. The combined force applied to the extracorporeal drainage bag should be 200N±10N.

[0113] 5. The force acting on the extracorporeal drainage bag should be maintained for at least 1 minute, but not longer than 1 minute and 10 seconds. After unloading, visually inspect the extracorporeal drainage bag and the white absorbent material for signs of leakage. If there are signs, the extracorporeal drainage bag is considered to be leaking and marked with an X.

[0114] The above test used 18 batches of 180 extracorporeal drainage bag test samples, and the results were statistically analyzed. After cleaning and drying, the samples were put into a flexible packaging bag sealing detection method of the present invention for sealing testing. The following are the test steps:

[0115] 1. Vacuum the liquid inlet tube for 5 seconds and inflate it for 5 seconds. After this operation, use a vacuum pump to vacuum the inside of the extracorporeal drainage bag and set the vacuum degree to -30 kPa.

[0116] 2. Slowly inject 750 ml of erythrosine aqueous solution into the extracorporeal drainage bag through the liquid inlet tube, and simultaneously fill the extracorporeal drainage bag with nitrogen at a rate of 120 ml / min until the extracorporeal drainage bag expands significantly.

[0117] 3. Keep filling the extracorporeal drainage bag with nitrogen, release the seal on the drainage tube, quickly connect the leakage critical part, and start detecting the internal air pressure of the extracorporeal drainage bag and the rate of gas released through the leakage critical part.

[0118] 4. Calculate whether the theoretical pressure in the extracorporeal drainage bag is consistent with the actual pressure 45 seconds after the leak critical part releases gas. If it is consistent, there is no gas leakage in the extracorporeal drainage bag. If it is inconsistent, there is a gas leakage, marked as Z, and the gas leakage detection results are recorded separately.

[0119] 5. Use a white paper towel to cover the surface of the extracorporeal drainage bag. After completing step 4, observe whether the paper towel is wet or discolored. If so, mark it with an X.

[0120] The sealing test results are summarized according to the test of GBT 17257.2-2009 standard, hereinafter referred to as the conventional test, and the test of a flexible packaging bag sealing detection method of the present invention, hereinafter referred to as the special test. The statistical results of the two test methods are summarized as shown in Table 2:

[0121]

[0122] Table 2. Test results of extracorporeal drainage bag samples

[0123] As can be seen from Table 2, in the test of extracorporeal drainage bag samples, 7 test samples were found to have liquid leakage problems in the routine test, while in the special test, 7 liquid leakage problems and 11 gas leakage problems were found. At the same time, there were 7 samples marked with YZ, indicating that both liquid and gas leakage problems were detected, and four more gas leakage problems were detected, but there were no test samples with liquid leakage.

[0124] Through the above two embodiments, an anti-reflux urine collection bag with a volume of 1500 ml and a thickness of 0.5 mm, and an extracorporeal drainage bag with a volume of 1000 ml and a thickness of 0.3 mm, 10 bags in each batch, and 18 batches of test samples were used for sealing tests. The sealing tests were first performed using the test method specified in the GBT 17257.2-2009 standard, and then using the sealing test method provided by the present invention. The results are shown in Tables 1 and 2.

[0125] It can be seen that the present invention has higher sensitivity in detecting gas leakage in flexible packaging bags, which is a key area that conventional tests fail to cover. Although gas leakage may not immediately lead to liquid leakage, it may cause changes in the internal pressure of the flexible packaging bag in the long run, affecting the sealing effect and even causing structural damage. In summary, the flexible packaging bag sealing detection method of the present invention has the comprehensiveness and accuracy that surpasses conventional testing methods, has higher quality requirements for flexible packaging bags, and provides new ideas and means for evaluating the sealing performance of medical devices such as flexible packaging bags. It not only helps to improve product quality and ensure patient safety, but also promotes continuous progress and innovation in the medical industry.

[0126] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for detecting the sealing of a flexible packaging bag, characterized in that: The following steps are involved: S1. Sealing the drainage pipe at the bottom of the flexible packaging bag; S2, injecting liquid into the vacuumed flexible packaging bag, and at the same time filling the flexible packaging bag with gas at a rate of 100 to 200 ml / min; S3, releasing the seal of the discharge pipe, and connecting a leakage critical part at the interface of the discharge pipe; the leakage critical part only allows gas to pass through, and is used to detect the internal air pressure of the flexible packaging bag and the air pressure released through the leakage critical part; S4. Based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part, calculate whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure 2 to 60 seconds after the leakage critical part releases the gas. If the two are inconsistent, it indicates that there is a small gas leakage on the surface of the flexible packaging bag; at the same time, detect the liquid seepage that may exist on the surface of the flexible packaging bag and its specific location; The calculation process in S4 includes: The inflation rate is R in， After inflation, the air pressure in the flexible packaging bag is P i , the volume is V; The release rate of gas through the leaking critical part R out , the time t of gas release; According to the ideal gas law , where n is the number of moles of gas, R is the ideal gas constant, and T is the temperature; since the air pressure in the flexible packaging bag reaches P i After that, the volume V and temperature T remain basically unchanged, and we get: The number of moles of gas released through the leaking critical part ; The number of moles of gas added by inflation simultaneously ; After time t, the theoretical air pressure in the flexible packaging bag is ; The actual air pressure in the flexible packaging bag after the leakage critical part detects time t is P1. When the pressure is too high, there is gas leakage on the surface of the flexible packaging bag.

2. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In S1, before sealing the liquid discharge pipe, air is firstly pumped out from the liquid inlet pipe or the liquid discharge pipe for 5 to 10 seconds, and then inflated for 5 to 10 seconds, and after 2 to 5 reciprocating cycles, the liquid discharge pipe is sealed.

3. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In S1, after sealing, the flexible packaging bag is subjected to vacuum treatment, and the vacuum degree is set to -20 to -50 kPa.

4. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In S2, the amount of liquid added into the flexible packaging bag is 70% to 75% of the test volume of the flexible packaging bag.

5. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In the step S2, the added liquid is a colored liquid.

6. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In the step S2, the gas filled is nitrogen, and the maximum air pressure in the flexible packaging bag is controlled to be 85% to 90% of the air pressure at which the flexible packaging bag ruptures.

7. A method for detecting the sealing of a flexible packaging bag according to claim 1, characterized in that: In S4, visual inspection or absorbent material covering technology is used to detect liquid seepage and its position on the surface of the flexible packaging bag; the absorbent material is a white paper towel or gauze. After the absorbent material is applied to the surface of the flexible packaging bag for 2 to 60 seconds, the absorbent material is checked for signs of leakage.

8. A flexible packaging bag sealing detection device, using a flexible packaging bag sealing detection method according to any one of claims 1 to 7, characterized in that: include: A vacuum module for vacuuming the flexible packaging bag; The gas-liquid co-injection module is used to inject liquid into the vacuumed flexible packaging bag and simultaneously fill the flexible packaging bag with gas at a rate of 100-200 ml / min; A leakage critical part is connected to the discharge pipe interface to detect the internal air pressure of the flexible packaging bag and the rate of gas released through the leakage critical part; The gas leakage judgment module calculates whether the theoretical air pressure in the flexible packaging bag is consistent with the actual air pressure after the leakage critical part releases gas for a certain period of time based on the internal air pressure of the flexible packaging bag, the inflation rate and the gas release rate of the leakage critical part. If the two do not match, it indicates that there is a small gas leakage on the surface of the flexible packaging bag; The liquid seepage detection module uses visual inspection or absorbent material covering technology to detect possible liquid seepage on the surface of flexible packaging bags and its specific location.

9. A flexible packaging bag sealing detection device according to claim 8, characterized in that: The leakage critical part includes: a shell, a microporous membrane arranged in the middle of the shell, a first air pressure sensor arranged on the upper part of the microporous membrane, and a second air pressure sensor arranged on the lower part of the microporous membrane; a connecting structure is arranged on the inner side of the shell, and is connected to the drain pipe through the connecting structure; the microporous membrane is used to block the liquid and allow the gas to pass through; The first air pressure sensor extends inside the flexible packaging bag to detect the air pressure inside the flexible packaging bag; The second air pressure sensor detects the rate of released gas passing through the microporous membrane.

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