CN104568347B - Testing device and testing method for testing leakage of small cigarette case - Google Patents

Abstract

The invention relates to a device and method for non-destructive testing of packaging bodies, in particular to a testing device and a testing method for testing the leakage of cigarette small box packages. A test device for testing the leakage of small cigarette packs, the device includes a test cavity, a compressed air device, a piston device and a three-way pipeline, and the test cavity, compressed air device and piston device are respectively connected to the three-way One end of the pipeline is provided with a first valve and a second valve on one end of the pipeline with the piston device and the compressed air device, and a pressure sensor is provided on the one end of the pipeline with the test chamber. The present invention adopts the above-mentioned technical scheme, uses compressed air to inflate and pressurize, and judges the amount of leakage according to the ratio of the balanced displacement difference. The device of the present invention is simple in structure and easy to implement. Accurately judge whether the small cigarette pack is leaking.

Description

A test device and test method for testing leakage of small cigarette packs

technical field

The invention relates to a device and method for non-destructive testing of packaging bodies, in particular to a testing device and a testing method for testing the leakage of cigarette small box packages.

Background technique

Sealing has a great influence on the quality of packaging products. If the seal is not good, it will be affected by moisture, salt spray, mold, etc. It is widely used in medical equipment, medicine, food and other fields. In the packaging process of the product, due to the influence of various factors, there may be leakage, pressure penetration or small holes connecting the inside and outside due to cracks and micropores in the material itself, which will affect the packaging content. substances have adverse effects. Especially in food, medicine, daily chemical and other product packaging, the airtightness will directly affect the quality of the product. For example, if the airtightness of vacuum and air-filled packaging is not good, even if high-barrier materials are used, the shelf life of the product will be directly shortened, causing certain economic losses to the enterprise. From this perspective, airtight testing of packaging products is a feasible way to enhance corporate image and obtain long-term economic benefits.

No matter how good the seal is, there will be some leakage. Absolutely airtight packaging does not exist, especially the small box packaging similar to cigarettes, which is heat-sealed with BOPP film. The airtightness is related to the temperature and time of the heat-sealing material. Not ideal.

Currently used leak detection methods include the following:

1. Visual method, visual inspection is to directly observe with the naked eye whether there is a loss of seal due to mechanical damage or poor sealing. It is mainly to check those packages that are obviously broken.

2. Talc powder method Talcum powder inspection Sprinkle talcum powder on the place where there is a suspected loss of seal on the sealed package, and then squeeze the package by hand. If the talcum powder is blown by the air discharged from the package, it means that the package has lost its seal.

3. Sealing performance tester method, the test method of the sealing performance tester is to make a small hole for air injection on the sealed package, and then inject compressed air into the sealed packing box through the small hole for air injection to make the pressure reach about 1.2 atmospheres. Turn off the gas injection switch and observe the pressure change in the sealed box. After 5 seconds, if the pressure remains unchanged, it means that the sealing performance is good, otherwise the seal will be lost. From the current point of view, these three methods have their applicability, but also have obvious defects. Visual inspection is simple and convenient, but only for obvious leaks. Talc powder inspection is greatly affected by packaging shape and human factors, and its reliability is not high. Although the reliability of the detector is high, the sealed package is destroyed at the same time. From punching to resealing, there are many working links, which is not conducive to work. The test result is a well-sealed package, and the testing process will cause many side effects .

4. Flow method, flow method can be used to measure the tightness of packaging film on cigarette box packaging, carton packaging and other mixed packaging wrapped with polyethylene or polypropylene film. However, this method is not suitable for shrink-wrapped, cellophane-wrapped or foil-wrapped boxes. The effectiveness of using the flow method to test package tightness may be compromised by substandard packaging, such as loose film, wrinkled film or foreign objects on the packaging film.

Contents of the invention

In order to solve the above-mentioned technical problems, the first object of the present invention is to provide a test device for testing the leakage of small cigarette packs. The device is simple in structure and easy to implement. Whether the packaging is leaking. The second object of the present invention is to provide a test method for testing the leakage of the small cigarette pack, which uses the above-mentioned device to quickly and accurately judge whether the pack of the cigarette pack is leaking.

In order to achieve the above-mentioned first purpose, the present invention adopts the following technical solutions:

A test device for testing the leakage of small cigarette packs, the device includes a test cavity, a compressed air device, a piston device and a three-way pipeline, and the test cavity, compressed air device and piston device are respectively connected to the three-way One end of the pipeline is provided with a first valve and a second valve on one end of the pipeline with the piston device and the compressed air device, and a pressure sensor is provided on the one end of the pipeline with the test chamber.

Preferably, the test chamber is made of metal, and its volume is close to that of the cigarette package.

In order to achieve the above-mentioned second purpose, the present invention adopts the following technical solutions:

A test method for testing the leakage of small cigarette packs, the method adopts the above-mentioned device, and comprises the following steps:

1) When the test sample is not placed, close the test chamber, first move the baffle plate of the piston to the far left, and close the first valve V ₁ and the second valve V ₂ ;

2) Open the second valve V ₂ to let the compressed air enter the cavity, and the air pressure reaches P ₁ . At the same time, close the second valve V ₂ and open the first valve V ₁ . After the baffle plate of the piston moves, record the displacement S, vent pressure;

3) Put the standard test body in the test chamber. The volume of the standard test body is equivalent to the sample to be tested. The same operation as above, after balancing, measure the displacement S ₀ of the movement. After the test is completed, vent the pressure;

4) Put the sample to be tested in the test chamber, and measure the displacement S ₁ of the movement according to the above operation. When the first valve V ₁ is opened, start timing. After reaching the balance, the measured balance time is t, After the test is completed, vent the pressure;

5) According to the time t, the tested object determines whether there is a large leakage. Under normal circumstances, t>0.5s, if t is less than 0.5 seconds, it indicates a large leakage; according to the following formula:

According to the size of A, the amount of leakage is judged; for hard-pack cigarettes with a trace leakage of more than 80%, it is judged as qualified; for soft-pack cigarettes, A is judged as qualified if it exceeds 75%.

The present invention adopts the above-mentioned technical scheme, uses compressed air to inflate and pressurize, and judges the amount of leakage according to the ratio of the balanced displacement difference. The device of the present invention is simple in structure and easy to implement. Accurately judge whether the small cigarette pack is leaking.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a test device for testing cigarette packet leakage, the device includes a test cavity 1, a compressed air device 2, a piston device 3 and a three-way pipeline 4, and the test cavity 1 is made of metal and With a sealing ring 5, the volume is similar to that of the cigarette package. The test cavity 1, the compressed air device 2 and the piston device 3 are respectively connected to one end of the three-way pipeline 4, and a first valve V is arranged on the end pipeline with the piston device 3 and the compressed air device 2 respectively. ₁ and the second valve V ₂ , a pressure sensor P is provided on the pipeline connected to the test chamber 1 at one end.

A test method for testing the leakage of cigarette small packs, the method adopts the above-mentioned device, comprising the following steps:

1) Close the test chamber 1 without placing the test sample, first move the baffle plate of the piston to the far left, and close the first valve V ₁ and the second valve V ₂ ;

2) Open the second valve V ₂ to let the compressed air enter the cavity, and the air pressure reaches P ₁ . At the same time, close the second valve V ₂ and open the first valve V ₁ . After the baffle plate of the piston moves, record the displacement S, vent pressure;

3) Put the standard test body in the test chamber 1. The volume of the standard test body is equivalent to the sample to be tested. The same operation as above, after balancing, measure the displacement S ₀ of the movement. After the test is completed, vent the pressure;

4) Put the sample to be tested in the test chamber 1, and follow the above operation to measure the displacement S ₁ of the movement. When the first valve V ₁ is opened, start timing. After reaching the balance, the measured balance time is t , after the test, vent the pressure;

5) According to the time t, the tested object determines whether there is a large leakage. Under normal circumstances, t>0.5s, if t is less than 0.5 seconds, it indicates a large leakage; according to the following formula:

Determine the size of the leakage according to the size of A.

The above-mentioned method is used to detect the cigarette small box packaging, and the detection data are as follows:

First fill the chamber with compressed air, and the measured pressure is 5KPa. After venting, the measured S is 4.96 cm. The standard test body is in the test chamber 1, and the measured S ₀ is 0.03 cm. This value is based on the volume of the pipeline. And change.

Put the sample to be tested in the test chamber 1, and operate as above. For cigarette hard box packaging, the measured displacement S ₁ is 0.5 cm; for cigarette soft box packaging, the measured displacement S ₁ is 0.6 cm; for large leakage samples , the measured displacement S ₁ is 1.2cm; according to multiple measurements, it is determined that the cigarette hard box packaging A is greater than 85%, and it is judged as qualified; the cigarette soft box packaging A is greater than 80%, and it is judged as qualified, and the above samples are calculated according to the formula. A (hard) = 90.4%, A (soft) = 88.4% are qualified products.

Claims (2)

1. the method for testing that a kind of test box cigarette small packaging is leaked, it is characterised in that the method is included with sealing using device Enclose test cavity (1), blowing plant (2), piston apparatus (3) and the triplate line (4) of (5), described test cavity (1), blowing plant (2) and piston apparatus (3) difference connect setting are in one end of triplate line (4), and are filling with piston The first valve V is provided with one end pipeline for putting (3) connection₁, arrange on one end pipeline being connected with blowing plant (2) There is the second valve V₂, on one end pipeline being connected with test cavity (1) pressure gauge P is provided with；The method includes following step Suddenly：

1) tested sample is not put, the plate washer of piston is first moved to Far Left, closes the first valve V by closure test cavity (1)₁With Second valve V₂；

2) the second valve V is opened₂, allowing compressed air in cavity, air pressure reaches P₁, simultaneously close off the second valve V₂, open the One valve V₁, after the plate washer movement of piston, write down mobile displacement S, blowdown pressure letdown；

3) standard testing body is put in test cavity (1), volume and the tested sample condition of standard testing body are worked as, same above-mentioned Operation, after balance, measures mobile displacement S₀, it is completed, blowdown pressure letdown；

4) tested sample is put in test cavity (1), equally by aforesaid operations, measure mobile displacement S₁, opening the first valve Door V₁When, start to clock, after reaching balance, the equilibration time for measuring is t, is completed, blowdown pressure letdown；

5) according to time t, tested sample whether gross leak, under normal circumstances, t are judged>0.5s, if t is less than 0.5 second, says Bright gross leak；A is calculated according to below equation：

$A=\frac{{\mathrm{\ΔS}}_1}{{\mathrm{\ΔS}}_0}\×100\%=\frac{S-S_1}{S-S_0}\×100\%$

Leakage rate size is judged according to the size of A；80% micro-leakage is more than to hard box Medicated cigarette A, it is qualified to be judged to；Soft box is rolled up It is qualified that cigarette A is judged to more than 75%.

2. method according to claim 1, it is characterised in that：Test cavity (1) is metal, volume and box cigarette small The volume of packaging is close.