A method for measuring the temperature of a cigarette during heating cigarette puffing based on a thermocouple

Abstract

The present invention discloses a method for measuring the temperature of a cigarette during puffing of a heated tobacco product based on a thermocouple, comprising the following steps: determining a punching position on the side wall of the heated tobacco product and punching; according to the distance a between the measurement point and the center of the circle, where r represents the radius length of the cigarette, folding the lower part of the thermocouple to form a vertical bending part with a length of "r - a" or "r + a", and inserting the vertical bending part of the lower part of the thermocouple at the punching position; sealing the gap between the vertical bending part of the lower part of the thermocouple and the heated tobacco product, and inserting the heated tobacco product into the appliance along the direction where the filter tip mark and the heating appliance mark coincide; using a cigarette smoking machine to puff on the heated tobacco product inserted into the heating appliance, and measuring the temperature during puffing. The method of the present invention can accurately measure the temperature at a certain position point during puffing of the heated tobacco product, and can conduct multiple verification tests on the same position point, with accurate results and small deviations.

Description

Technical Field

[0001] The present application belongs to the technical field of novel tobacco products, and specifically relates to a method for measuring the temperature of a heated cigarette when it is smoked based on a thermocouple. Background Art

[0002] In recent years, with consumers' increasing concern about smoking and health and the increasing efforts to ban smoking in public places, the sales of traditional tobacco products are facing a turning point, while new tobacco products that meet consumers' health demands, especially heated cigarettes, are rapidly emerging. The principle of heated cigarettes is that tobacco raw materials absorb the external heat provided by the heater, increase their own temperature and release smoke, which is a complex process of heat transfer and mass transfer aroma coupling.

[0003] There have been some reports on measuring the temperature of traditional cigarettes when they are smoked. In the invention patent publication number CN103983370, a thermocouple wire is passed through the cigarette to be tested and then tied into a knot. The radius of the measured cigarette is measured at the knot and calibrated, and the knot is pulled back to the center of the cigarette. This method has certain reference significance when measuring the temperature of traditional cigarettes when smoking, but it is not suitable for measuring the temperature of heated cigarettes when smoking. The reasons are as follows: ① Due to the obstruction of the heating cigarette device, the thermocouple cannot be directly inserted into the cigarette through the smoking device to accurately measure the temperature of a certain position point; ② In the center heating method, a heating plate or heating rod is built-in at the center of the heating device, and the heated cigarette is inserted into the heating rod or heating plate for heating. The thermocouple of the above patented method cannot pass through the center of the cigarette and bypass the obstruction of the heating plate or heating rod; ③ The design parameters of electric heated cigarettes are different from those of traditional cigarettes. For example, the air permeability of heated cigarette paper is almost zero. If the thermocouple is knotted and pulled back to the center of the cigarette for smoking, it will inevitably have a huge impact on the flow field of the airflow when the entire heated cigarette is smoked, resulting in inaccurate measurement results; ④ Due to the obstruction of the heating device, there are certain doubts as to whether the thermocouple is inserted along the center of the cross-section of the cigarette.

[0004] The measurement of the temperature of heated cigarettes during smoking is also a common problem in the tobacco industry. Currently, there is no method that can quickly and accurately measure the temperature of a certain position of a heated cigarette during smoking. Zhengzhou Tobacco Research Institute uses slotting treatment on heated cigarette utensils to solve the problem of heating utensils blocking during smoking. Although this method has relatively accurate measurement results and can repeatedly verify the measured temperature results, for heated cigarettes with ambient heating, the slotting of the smoking utensils may affect the direction of airflow. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for measuring the temperature of a heated cigarette when smoking based on a thermocouple in view of the shortcomings of the existing technology, so as to accurately measure the temperature of a heated cigarette at a certain position during the smoking process.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A method for measuring the temperature of a cigarette during heating cigarette puffing based on a thermocouple, comprising the following steps:

[0007] Make marks on the filter tip end of the heating cigarette and the heating cigarette appliance respectively;

[0008] Determine the punching position on the side wall of the heating cigarette according to the height h of the measurement point from the filter tip end and its position in the cross-section of the heating cigarette, and punch a hole;

[0009] According to the distance a between the measurement point and the center of the circle, where r represents the radius length of the cigarette, fold the lower part of the thermocouple to form a vertical bending part with a length of "r - a" or "r + a", and insert the vertical bending part of the lower part of the thermocouple at the punched hole;

[0010] Seal the gap between the vertical bending part of the lower part of the thermocouple and the heating cigarette, and insert the heating cigarette into the appliance along the direction where the marks on the filter tip end and the appliance coincide;

[0011] Use a cigarette smoking machine to puff on the heating cigarette inserted into the heating cigarette appliance, and measure the temperature during puffing.

[0012] Further, the diameter of the thermocouple is 0.2 mm to 0.5 mm.

[0013] Further, use glue to seal the gap between the vertical bending part of the lower part of the thermocouple and the heating cigarette, and after drying, insert the heating cigarette into the heating cigarette appliance.

[0014] Further, the glue is the heating cigarette lap joint glue or latex.

[0015] Further, the method for determining the punching position on the side wall of the heating cigarette comprises the following steps:

[0016] Mark the cross-sectional position of the measurement point at the filter tip end of the heating cigarette, and connect it to the center of the circle at the filter tip end to draw a straight line I;

[0017] Taking the end point of the straight line I on the side wall of the heating cigarette as the starting point, draw a straight line II on the cigarette of the heating cigarette. The straight line II is parallel or coincides with the lap joint of the heating cigarette paper, and determine the punching position of the cigarette measurement point on the straight line II.

[0018] Further, a vertical bending part is also folded at the upper part of the thermocouple. The vertical bending part at the upper part of the thermocouple and the vertical bending part at the lower part of the thermocouple are in the same plane. When inserting the vertical bending part at the lower part of the thermocouple at the punched hole, the vertical bending part at the upper part of the thermocouple and the straight line I are on the same straight line. It is used to calibrate whether the inserted thermocouple is inserted towards the center of the cigarette.

[0019] Further, the heating method of the heated cigarette is central heating, peripheral heating, or combined central and peripheral heating.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention can accurately measure the temperature at a certain position point during the suction of a heated cigarette, and multiple verification tests can be carried out on the same position point. The results are accurate and the deviation is small, solving the common problems in the industry. After the experiment, the heated cigarette stick is cut. After comparison, it is found that the temperature at the measured position point coincides with the required measured position point, indicating that the method of the present invention is accurate and effective and can be used to measure the temperature of the cigarette stick at a certain point during the suction of a heated cigarette. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the filter tip end of a heated cigarette.

[0022] Figure 2 It is a schematic side view of a heated cigarette.

[0023] Figure 3 It is a schematic diagram of a thermocouple.

[0024] Figure 4 It is a schematic diagram of a cigarette with a thermocouple inserted into a heated cigarette appliance.

[0025] Figure 5 It is a schematic diagram of the alignment of the mark at the filter tip end of a heated cigarette and the mark on the heating appliance.

[0026] Figure 6 It is the temperature measurement result during the suction of the heated cigarette in Example 1.

[0027] Figure 7 It is the temperature measurement result during the suction of the heated cigarette in Example 2.

[0028] Figure 8 It is the temperature measurement result during the suction of the heated cigarette in Example 3. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described below in conjunction with specific embodiments. The following embodiments are intended to illustrate the present invention rather than further limit the present invention.

[0030] Example 1

[0031] As Figure 1 shown, at the filter tip end of the heated cigarette 10, use a pen to connect the position 2 (25 mm from the acetate filter tip and 2.5 mm from the center) of the measured temperature point on the cross-section of the heated cigarette to the center 3, and draw a straight line I 4; As Figure 2As shown, taking the endpoint of the straight line I 4 as the starting point, draw a straight line II 6 on the heated cigarette along the direction parallel to the lap joint 5 of the cigarette paper, and determine the punching position 7 of the cigarette measurement temperature point on the straight line II 6; as Figure 3 shown, select a diameter of 0.25 mm for the thermocouple 8 and a punching hole diameter of 0.3 mm. Fold the thermocouple 8 into a "Z shape", with the length of one end being 5.35 mm (cigarette radius + 2.5 mm), and insert it into the cigarette 10 along the direction coinciding with the straight line II 6; use lap joint glue to seal the gap around the thermocouple 8, as Figures 4-5 shown, after drying, insert the heated cigarette 10 into the smoking device 9 along the direction where the filter tip mark 1 and the appliance mark 11 coincide, and conduct suction temperature measurement. Conduct three repeated experiments, and the experimental results are as Figure 6 shown. To prove that the temperature position points measured in the three repeated experiments are the same, after suction, cut the cigarette and find that the measured position point coincides with the required position point, meeting the requirements of the experiment.

[0032] Example 2

[0033] Use a pen at the filter tip of the heated cigarette 10 to connect the position 2 (7 mm from the acetate filter and 0.3 mm from the center of the circle) where the measured temperature point is located on the cross-section of the heated cigarette to the center of the circle, and draw a straight line I 4; taking the endpoint of the straight line I 4 as the starting point, draw a straight line II 6 on the heated cigarette along the direction parallel to the lap joint of the cigarette paper, and determine the punching position 7 of the cigarette measurement temperature point on the straight line II 6; select a diameter of 0.25 mm for the thermocouple 8 and a punching hole diameter of 0.3 mm. Fold the thermocouple 8 into a "Z shape", with the length of one end being 2.55 mm (cigarette radius - 0.3 mm), and insert the thermocouple 8 into the cigarette 10 along the direction coinciding with the straight line II 6; use lap joint glue to seal the gap around the thermocouple 8, and after drying, insert the heated cigarette 10 into the smoking device 9 along the direction where the filter tip mark 1 and the appliance mark 11 coincide, and conduct suction temperature measurement. Conduct three repeated experiments, and the experimental results are as Figure 7 shown. To prove that the temperature position points measured in the three repeated experiments are the same, after suction, cut the cigarette and find that the measured position point coincides with the required position point, meeting the requirements of the experiment.

[0034] Example 3

[0035] At the filter end of the heated cigarette 10, use a pen to connect the measured temperature point at position 2 on the cross-section of the heated cigarette (30 mm from the acetate filter and 1.5 mm from the center of the circle) to the center of the circle, and draw a straight line I 4; starting from the end point of this straight line I 4, draw a straight line II 6 on the cigarette stick of the heated cigarette along the direction parallel to the lap of the cigarette paper, and determine the punching position 7 of the temperature measurement point of the cigarette stick on the straight line II 6; select a diameter of 0.25 mm for the thermocouple 8 and a punching aperture of 0.3 mm, fold the thermocouple 8 into a "Z shape", with the length of one end being 4.35 mm (cigarette stick radius + 1.5 mm), and insert the thermocouple 8 into the cigarette stick 10 along the direction coinciding with the straight line II 6; use lap joint glue to seal the gap around the thermocouple 8, and after drying, insert the heated cigarette stick 10 into the smoking device 9 along the direction where the filter end mark 1 coincides with the device mark 11 to measure the suction temperature. Conduct three repeated experiments, and the experimental results are as Figure 8 shown. To prove that the temperature measurement position points in the three repeated experiments are the same, after suction, cut the cigarette stick and find that the measured position points coincide with the required position points, meeting the requirements of the experiment.

Claims

1. A method for measuring the temperature of a cigarette during heating cigarette smoking based on a thermocouple, characterized in that Comprising the following steps: Make marks on the filter tip end of the heated cigarette and the heated cigarette appliance respectively; Determine the punching position on the side wall of the heated cigarette according to the height h of the measurement point from the filter tip end and its position in the cross-section of the heated cigarette, and punch a hole; According to the distance a between the measurement point and the center of the circle, where r represents the radius length of the cigarette, fold the lower part of the thermocouple to form a vertical bending part with a length of "r - a" or "r + a", and insert the vertical bending part of the lower part of the thermocouple at the punched hole; Seal the gap between the vertical bending part of the lower part of the thermocouple and the heated cigarette, and insert the heated cigarette into the appliance along the direction where the marks on the filter tip end and the appliance coincide; Use a cigarette smoking machine to suck the heated cigarette inserted into the heated cigarette appliance, and measure the temperature during suction; The method for determining the punching position on the side wall of the heated cigarette comprises the following steps: Mark the cross-sectional position of the measurement point at the filter tip end of the heated cigarette, connect it to the center of the circle at the filter tip end, and draw a straight line I; Taking the end point of the straight line I on the side wall of the heated cigarette as the starting point, draw a straight line II on the cigarette of the heated cigarette. The straight line II is parallel or coincides with the joint of the cigarette paper. Determine the punching position of the measurement point on the cigarette on the straight line II; The upper part of the thermocouple is also folded to form a vertical bending part. The vertical bending part of the upper part of the thermocouple and the vertical bending part of the lower part of the thermocouple are in the same plane. When inserting the vertical bending part of the lower part of the thermocouple at the punched hole, the vertical bending part of the upper part of the thermocouple and the straight line I are on the same straight line; The heating method of the heated cigarette is central heating, peripheral heating or combined central and peripheral heating.

2. The method for measuring the temperature of a cigarette during puffing of a heated cigarette according to claim 1, characterized in that, The diameter of the thermocouple is 0.2 mm to 0.5 mm.

3. The method for measuring the temperature of a cigarette during puffing of a heated cigarette according to claim 1, wherein Use glue to seal the gap between the vertical bending part of the lower part of the thermocouple and the heated cigarette. After drying, insert the heated cigarette into the heated cigarette appliance.

4. The method for measuring the temperature of a cigarette during puffing of a heated cigarette according to claim 3, wherein The glue is the cigarette joint glue for the heated cigarette or latex.

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