A method and device for testing the fluidity of smoke oil in oil storage cotton

Abstract

The present invention relates to a method and device for testing the fluidity of tobacco oil in oil storage cotton, comprising the following steps: vertically clamping the oil storage cotton on a sample loading platform along the fiber distribution direction; using an oil injector to drip tobacco oil onto the upper end surface of the oil storage cotton on the sample loading platform, ensuring that the tobacco oil is in a free dripping state and the oil injection speed is constant; using a CCD camera to photograph and identify the oil injection surface of the oil storage cotton, and presetting the diffusion margin of the tobacco oil on the oil injection surface in the image; when the tobacco oil diffuses to the diffusion margin on the oil injection surface, stop the oil injection and record the oil injection time; calculate the penetration depth of the tobacco oil by the total amount of tobacco oil injected and the tobacco oil diffusion area on the oil injection surface, and obtain the lateral and longitudinal flow rate of the tobacco oil in combination with the oil injection time. This method can test the fluidity of different tobacco oils in oil storage cotton, evaluate the matching and safety of the oil storage cotton and tobacco oil, and has the advantages of high-precision measurement and multi-purpose.

Description

Technical Field

[0001] The invention relates to a method and a device for testing the performance of an electronic atomizer oil storage cotton, in particular to a method and a device for testing the fluidity of tobacco oil in an oil storage cotton. Background Art

[0002] Oil storage cotton is an important component of disposable electronic cigarette products. It stores liquid oil in a nearly solid shape through the capillary effect, and ensures that the oil can flow in liquid form and be replenished during use as the oil is inhaled and consumed in the atomization area.

[0003] The core of this storage and flow is that the fibers in the e-liquid and the oil storage cotton have good wettability, and a capillary effect is established on the basis of wetting. This involves the hydrophilicity of the oil storage cotton fibers, the pore size of the oil storage cotton, the specific surface area of ​​the oil storage cotton, the surface tension of the e-liquid, the viscosity of the e-liquid, the ratio of the content of polar substances to non-polar substances in the e-liquid and other factors. Moreover, the correlation between these factors is not obviously positively or negatively correlated, and it is usually difficult to describe and quantify them with accurate data. However, once one or several of the data fluctuate, unpredictable faults will occur, such as oil leakage, excessive residual oil, rapid taste attenuation, poor oil supply, core sticking, odor and other problems.

[0004] Therefore, it is necessary to establish a set of test methods and test equipment for the fluidity of e-liquid in oil storage cotton, use actual test data and experimental phenomena to characterize the compatibility of each oil storage cotton and specific e-liquid, make a full assessment of the existing risks before the product is put on the market, and reduce the losses caused by failures. Summary of the invention

[0005] In view of the above situation, it is necessary to provide a method and device for testing the fluidity of e-liquid in an oil storage cotton that can solve at least one of the above problems.

[0006] A method for testing the fluidity of smoke oil in oil storage cotton comprises the following steps:

[0007] Clamp the oil storage cotton vertically on the sample loading platform along the fiber distribution direction, so that a flat surface on the oil storage cotton faces upward horizontally;

[0008] Use the oil injector to drip the oil onto the upper end of the oil storage cotton on the sample loading platform, ensuring that the oil drips freely and at a constant oil injection speed;

[0009] Use a CCD camera to photograph and identify the oil filling surface of the oil storage cotton, and preset the diffusion margin of the smoke oil on the oil filling surface in the image. When the smoke oil diffuses to the preset diffusion margin on the oil filling surface, stop filling and record the filling time;

[0010] The penetration depth of the e-liquid is calculated by the total amount of e-liquid added and the e-liquid diffusion area on the filling surface, and the lateral and longitudinal flow rates of the e-liquid are obtained in combination with the filling time.

[0011] As a further solution of the present invention: the CCD camera is used to photograph the oil filling surface of the oil storage cotton, and the central oil filling point of the photograph is aligned.

[0012] As a further solution of the present invention: the CCD camera is arranged on the side of the oil storage cotton, the boundary point of the upper end surface of the oil storage cotton closest to the oil filling point is the preset margin, and the shooting center of the CCD camera is the aforementioned preset margin point.

[0013] As a further solution of the present invention: it also includes the following steps:

[0014] A CCD camera is arranged at the bottom of the oil storage cotton to photograph the bottom of the oil storage cotton;

[0015] If the CCD camera at the bottom captures the smoke oil seeping out from the bottom of the oil storage cotton before the smoke oil spreads to the preset diffusion margin on the oil filling surface, the oil filling is stopped and the oil storage cotton is judged as a defective product.

[0016] The present invention also discloses a device for testing the fluidity of cigarette oil in oil storage cotton, using any of the above-mentioned testing methods, comprising a sample loading platform, an oil injector and a CCD camera;

[0017] The at least one CCD camera is used to photograph the oil filling surface and the bottom surface of the oil storage cotton.

[0018] As a further solution of the present invention: the oil filling surface of the oil storage cotton is horizontally facing upward, a CCD camera photographs the oil filling surface, and the photographing center of the CCD camera coincides with the oil filling point.

[0019] As a further solution of the present invention: the fiber distribution direction of the oil storage cotton is vertical, the upper end surface of the oil storage cotton is the oil injection surface, and the minimum distance from the oil injection point to the edge of the oil storage cotton is a preset distance;

[0020] The shooting center of the CCD camera is the oil filling point.

[0021] As a further solution of the present invention: a CCD camera is arranged at the bottom of the oil storage cotton, and its shooting center is the positive projection position of the oil filling point on the bottom of the oil storage cotton.

[0022] The above-mentioned oil storage cotton fluidity test method and device adopts a visual solution, using the (vertical and horizontal) diffusion of the smoke oil in the oil storage cotton, which is proportional to the oil injection amount and is distributed in an inverted cone. The inverted cone model is used to calculate the vertical and horizontal diffusion speeds, thereby describing the flow characteristics of the smoke oil in the oil storage cotton. Under the premise of controlling the two quantitative factors of the cone bottom area and volume, the cone height is calculated to accurately determine the speed of the smoke oil flowing in the oil storage cotton and obtain the fluidity parameters of the oil storage cotton. This method can test the fluidity of different smoke oils in the same type of oil storage cotton, evaluate the compatibility and safety of the oil storage cotton and the smoke oil, and has the advantages of high-precision measurement and multi-purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of an embodiment of the present invention;

[0024] Figure 2 is a test result table of Experimental Example 1 of the present invention;

[0025] Figure 3 is a test result table of Experimental Example 2 of the present invention;

[0026] Figure 4 is a schematic diagram of the structure of a test device according to an embodiment of the present invention;

[0027] Figure 5 is a schematic diagram of the flow range of the smoke oil according to an embodiment of the present invention;

[0028] Figure 6 is a schematic diagram of shooting directions according to an embodiment of the present invention;

[0029] Figure 7 2 is a schematic diagram of a second shooting direction according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following is a further detailed description of a method and device for testing the fluidity of e-liquid in an oil storage cotton of the present invention in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] 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 a direct connection, or it can be indirectly connected through an intermediate medium, or 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.

[0033] like Figure 1 As shown, a method for testing the fluidity of e-liquid in an e-liquid storage cotton comprises the following steps:

[0034] S100, clamp the oil storage cotton vertically on a sample loading platform along the fiber distribution direction, the sample loading platform is transparent glass, so that a plane on the oil storage cotton is horizontally facing upward, and the upward surface is used as the oil filling surface in the test; the fibers in the oil storage cotton are macroscopically unidirectionally linearly distributed. During the use of the electronic cigarette, the distribution direction of the fibers in the oil storage cotton is consistent with gravity, so the oil storage cotton is clamped along its own fiber distribution direction in the experiment;

[0035] S200, use an oiler to drip the oil onto the upward end surface of the oil storage cotton on the sample carrier, ensure that the oil is in a free dripping state, and keep the oiling speed constant; since the fibers are one-dimensionally distributed in the macroscopic state, they show lateral curling and crossing in the microscopic state, and are bonded at the intersections, so the capillary structure constructed by the oil storage cotton fibers dominates the conduction of the oil in the vertical direction first, but the oil is an excellent viscoelastic body at room temperature and tends to maintain a spherical shape, so while being conducted in the vertical direction, it can also diffuse in the horizontal direction; in this step, the oiling port of the oiler is as close as possible to the upper end surface of the oil storage cotton, and the oil drips freely onto the oil storage cotton, which can ensure that the oil is under the premise of zero injection pressure. Based on the aforementioned principle of conduction and diffusion of the oil in the oil guide cotton, as the oil is continuously dripped from the top and transferred downward, the oil will be distributed in the oil storage cotton in an inverted cone shape;

[0036] S300, using a CCD camera to photograph and identify the oil filling surface of the oil storage cotton, and preset the diffusion margin of the smoke oil on the oil filling surface in the image, and when the smoke oil spreads to the preset margin on the oil filling surface, stop filling, record the filling time, and record the total filling amount;

[0037] S400, calculate the diffusion depth of the e-liquid by the total amount of e-liquid added and the e-liquid diffusion area on the filling surface, and obtain the lateral and longitudinal flow rates of the e-liquid in combination with the filling time. The matching of different wetting properties will result in a large difference in the lateral diffusion radius and longitudinal diffusion height of the inverted cone, that is, different e-liquids have different lateral and longitudinal flow rates in the same piece of oil storage cotton, and thus calculate the reasonable range of matching between the e-liquid and the oil storage cotton. For the cone formed by the flow and diffusion of the e-liquid, the greater the height of the cone on the same bottom diameter, the better the fluidity of the e-liquid.

[0038] The calculation formula of the lateral flow velocity of the smoke oil in the oil storage cotton is: V 横 =r / t; The calculation formula of the longitudinal flow velocity of the smoke oil in the oil storage cotton is: V 纵 =h / t; where h is the height of the smoke oil flowing vertically in the oil storage cotton ( Figure 5 h' represents the vertical flow height of different e-liquids in the oil storage cotton, which is equivalent to h in the formula. The calculation formula is h = L / (1 / 3πr 2 ), in the above formula, L is the total amount of e-liquid dripped within time t, r is the base radius of the cone (the distance from the preset boundary to the oil filling point), and t is the time it takes for the e-liquid to reach the preset boundary.

[0039] The above-mentioned oil storage cotton fluidity testing method and device adopt a visual solution, using the principle that liquid penetrates into a solid in a cone shape. Under the premise of controlling the two quantitative conditions of the cone bottom area and volume, the cone height is calculated to accurately determine the flow rate of the e-liquid in the oil storage cotton and obtain the fluidity parameters of the oil storage cotton. This method and device can test the fluidity of e-liquids with different components in the same type of oil storage cotton, and can also evaluate the matching and safety of the oil storage cotton and the e-liquid, and has the advantages of high-precision measurement and multi-purpose.

[0040] As a further solution of the present invention: the CCD camera is used to photograph the oil filling surface of the oil storage cotton, and the shooting center of the CCD camera is adjusted to align with the oil filling point. Because the smoke oil is dripped from one point, the diffusion of the smoke oil on the oil storage cotton will be divided into longitudinal and lateral directions. Therefore, the smoke oil will form a conical diffusion area in the oil storage cotton. The preset margin is the bottom surface boundary of the conical diffusion area, which is specifically reflected in the preset radius of the circular diffusion area of ​​the smoke oil on the oil filling surface, and the bottom surface area is controlled to be quantitative. When the first variable oil filling amount is also a certain value, the depth of the longitudinal diffusion, that is, the height of the conical penetration area can be directly calculated by the cone volume formula. Combined with the oil filling time, the flow rate of the smoke oil in the cotton can be calculated. At the same time, in addition to the longitudinal flow rate, the flow rate in the horizontal direction is also obtained.

[0041] As a further solution of the present invention: a CCD camera is set on the side of the oil storage cotton, and the boundary of the oil storage cotton is the diffusion margin of the smoke oil. In this solution, the shooting surface is changed from the oil filling surface to the side surface, and the basic principle is the same. The same is that the preset margin, that is, the bottom surface boundary of the conical diffusion area, is the same as the distance from the smoke oil filling point to the edge of the upper end surface of the oil storage cotton. When the smoke oil appears from the side, that is, the smoke oil diffusion has reached the preset boundary, the smoke oil filling is stopped at this time, the filling time is recorded, and the diffusion rate is calculated based on the amount of smoke oil dripped and the filling time.

[0042] As a further solution of the present invention: it also includes the following steps:

[0043] A CCD camera is arranged at the bottom of the oil storage cotton to take pictures of the bottom of the oil storage cotton;

[0044] If the CCD camera at the bottom captures the oil seeping out from the bottom of the oil storage cotton before the oil diffuses to the preset margin on the oil filling surface, the oil filling is stopped and it is determined that the oil storage cotton is not compatible with the oil. As an extended solution, this solution is used to determine whether the oil storage cotton is qualified. If the oil flows too fast in the oil storage cotton, the oil will flow downward quickly under the action of gravity. Therefore, before the oil diffuses to the preset margin in the horizontal direction, it has already seeped out from the bottom of the oil storage cotton, proving that the pores of the oil storage cotton are too large and the oil flows too fast in it. If it is installed on the atomizer for use, there will be oil leakage. On this basis, replace the sample with a higher height and repeat the test until the oil diffuses to the preset margin on the oil filling surface and the CCD camera does not capture the oil seeping out from the bottom of the oil storage cotton, so as to obtain the most accurate data for the oil.

[0045] like Figure 4-Figure 7 As shown, the present invention also discloses a fluidity testing device for oil storage cotton, comprising a sample loading platform 100, an oil injector 200 and a CCD camera 300;

[0046] At least one of the CCD cameras 300 is used to photograph the oil filling surface, and / or the side surface and bottom surface of the oil storage cotton 400. One of the oil filling surface 410 and the side surface 420 of the oil storage cotton 400 must be photographed, or both can be photographed at the same time to reduce the error. Furthermore, bottom surface photography is an extended option, which is used to determine whether the oil storage cotton is a defective product. Before the oil of the defective oil storage cotton spreads to the preset boundary, the oil will seep out from the bottom of the oil storage cotton, proving that the oil storage cotton is not compatible with this type of oil and there is a risk of oil leakage.

[0047] As a further solution of the present invention: the oil filling surface 410 of the oil storage cotton 400 is horizontally facing upward, the CCD camera 300 photographs the oil filling surface 410, and the photographing center 310 of the CCD camera 300 is aligned with the oil filling point.

[0048] As a further solution of the present invention: the oil filling surface 410 of the oil storage cotton 400 is horizontally upward, and the fiber distribution direction of the oil storage cotton 400 is vertical; the CCD camera 300 is arranged on the side 420 of the oil storage cotton 400, and the boundary point of the upper end surface of the oil storage cotton closest to the oil filling point is the preset margin, and the shooting center 310 of the CCD camera is aligned with the oil filling point.

[0049] As a further solution of the present invention: a CCD camera is arranged at the bottom of the oil storage cotton, and its shooting center 310 is the positive projection position of the oil filling point 210 on the bottom of the oil storage cotton.

[0050] Experimental Example 1 of the present invention: In this experimental example, the size of the oil storage cotton to be verified is 22.5*4.3*36mm; the materials are pure PA and PA+PET, and four groups of different densities are set for comparison of experimental results. The lateral radius of all oil storage cotton samples is set to 22.5mm, that is, the distance from the preset boundary to the oil filling point. The smoke oil with a surface tension of 38mN / m is selected for testing. The density and material of the oil storage cotton are used as variables. The measured results are as follows: Figure 2 shown.

[0051] Experimental Example 2 of the present invention is different from Experimental Example 1 in that the surface tension of the e-liquid used is 35 mN / m. The measured results are as follows: Figure 3 shown.

[0052] In summary, the testing method disclosed in the present invention can test the fluidity of different e-liquids in the same type of oil storage cotton, and has the advantages of high-precision measurement and multi-purpose.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for testing the fluidity of smoke oil in oil storage cotton, characterized in that: The following steps are involved: Clamp the oil storage cotton vertically on the sample loading platform of the testing device along the fiber distribution direction; Use the oil injector to drip the oil onto the upper end of the oil storage cotton on the sample loading platform, ensuring that the oil drips freely and at a constant oil injection speed; Use a CCD camera to photograph and identify the oil filling surface of the oil storage cotton, and preset the diffusion margin of the smoke oil on the oil filling surface in the image; When the e-liquid diffuses to the preset diffusion margin on the filling surface, stop filling and record the filling time; The penetration depth of the e-liquid is calculated by the total amount of e-liquid added and the e-liquid diffusion area on the filling surface, and the lateral and longitudinal flow speeds of the e-liquid are obtained in combination with the filling time; A CCD camera is arranged at the bottom of the oil storage cotton to take pictures of the bottom of the oil storage cotton; If the e-liquid seeps out from the bottom of the oil storage cotton before the e-liquid spreads to the preset diffusion margin on the oil filling surface, the bottom CCD camera will stop filling and judge the oil storage cotton as defective; The formula for calculating the lateral flow velocity of the e-liquid in the oil storage cotton is: V horizontal = r / t; the formula for calculating the longitudinal flow velocity of the e-liquid in the oil storage cotton is: V vertical = h / t; where h is the height of the e-liquid flowing longitudinally in the oil storage cotton, and the calculation formula is h=L / (⅓πr²). In the above formula, L is the total amount of e-liquid dripped within time t, r is the base radius of the cone, and t is the time when the e-liquid reaches the preset boundary; The transverse and longitudinal flow speeds of the e-liquid in the oil-storing cotton are used as the fluidity evaluation of the e-liquid in the oil-storing cotton.

2. The method for testing the fluidity of the e-liquid in the oil storage cotton according to claim 1, characterized in that: The CCD camera is used to photograph the oil filling surface of the oil storage cotton, and the photographing center is aligned with the oil filling point.

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