CN111426618B - Rapid evaluation and inspection system and method for cooling material - Google Patents

Abstract

The invention relates to the technical field of evaluation of cooling effects of heating non-combustible cigarette filter materials, in particular to a rapid evaluation and inspection system and method for cooling materials. The evaluation and inspection system and the method can rapidly evaluate various cooling materials, truly reflect the use cooling effect of various cooling materials and accelerate the screening of the cooling materials. The evaluation and inspection method can be used for daily rapid inspection of the cooling effect of the cooling material, and can evaluate the cooling effect after processing by different processing technologies, so that the method is used for rapid adjustment of the cooling material and technology combination, a cooling section with better cooling effect is prepared, and waste of the cooling material is avoided.

Description

A rapid evaluation and inspection system and method for cooling materials

Technical field

The invention relates to the technical field of cooling effect evaluation of heat-not-burn cigarette filter materials, and in particular to a rapid evaluation and inspection system and method for cooling materials.

Background technique

A large number of studies have shown that nicotine and most flavor components can be released from tobacco and transferred to smoke at relatively low temperatures (250-500°C). Excessive temperature will not only increase the types and types of harmful components in smoke, but The content will also convert the fragrance ingredients into harmful substances. Therefore, if the temperature of cigarettes is lowered to below 500°C, which is the so-called "tobacco heats but does not burn", many harmful components in the smoke can be greatly reduced, while the aroma components are relatively less affected, and some flavor components can even It may increase due to reduced pyrolysis, so heat-not-burn cigarettes came into being.

Heat-not-burn cigarettes are shorter than traditional cigarettes, and the high-temperature smoke passes through the cigarette for a shorter time. Suitable materials are needed to cool down the high-temperature smoke. Patent CN201710191528.5 reports a cigarette cooling filter rod with endothermic gel added, and patent CN201410624331.2 reports a composite phase change material composed of C19-C21 alkanes loaded on the surface of expanded graphite and/or porous silica gel particles. , when this phase change material is added to cigarette filter rods, it can effectively reduce the temperature of cigarette smoking; patents CN104203015A, CN108030151A, and CN107981417A disclose aerosol-generating articles with aerosol cooling elements, in which the aerosol cooling elements can be Composed of free polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil , in the embodiment, the aerosol cooling element is mainly composed of wrinkled and gathered polylactic acid film sheets; Chinese patent CN108523216A discloses a polylactic acid tow filter rod that can reduce the temperature of flue gas and has low suction resistance and its corresponding Preparation method; Chinese patent CN 108201169A discloses a cooling unit formed by embossing and folding a composite sheet bonded by a polymer film and cellulose paper, in which the polymer film is mainly a polylactic acid film, a polyethylene film, a polyethylene film, Acrylic film etc. The above-mentioned patents have all solved the problem of cooling high-temperature flue gas. However, the current problems are how to evaluate and select many cooling materials on the one hand, and on the other hand, which process can be used to process the cooling materials to obtain better results. Cooling effect to avoid production waste.

Contents of the invention

In view of this, the purpose of the present invention is to provide a system and method for rapid evaluation and inspection of cooling materials. Image recognition technology can be used to quickly evaluate the cooling effect of cooling materials, screen out better cooling materials, and select appropriate processing techniques. Cool materials for processing to avoid production waste.

The present invention solves the above technical problems through the following technical means:

One aspect of the present invention is to provide a rapid evaluation and inspection method for cooling materials. Scan and obtain images of two or more cooling materials before and after suction, identify the pore diameter and number of pores in the images, and compare the cooling materials. The diameter and number of pores before and after suction are used to qualitatively evaluate the cooling effect of the cooling material.

Preferably, the method specifically includes the following steps:

S1. For two or more cooling material samples or cooling sections processed by different processes, use a scanning electron microscope to scan the images before and after suction to obtain the original pictures before and after suction;

S2. Perform image enhancement processing on the original pictures before suction and the original pictures after suction, and then identify the pore images of each enhanced picture respectively;

S3. Identify the pore diameter and number of pores in the pore image, compare the pore diameter and number of pores before and after suction of cooling materials and different processes, and qualitatively evaluate and determine the cooling effect of cooling materials and processes.

Preferably, in step S3, compare the pore diameter and number of pores between the cooling materials before and after suction, and the cooling material with a larger pore diameter and a larger number of pores is a qualified material.

Preferably, the evaluation and inspection method also includes combining the selected better materials and better processes, collecting the end batches of cooling materials with adjusted process parameters, and calculating the qualified judgment range through the image system, and comparing the judged range. Verify again, adjust the parameters, and determine the judgment standards, which are used to scan the end faces of the mass-produced cooling filter rods to determine whether they are qualified.

Preferably, the judgment criterion is that if there are more than 5 channel bundles with Rmin>20B and RMAX>100B, it is qualified.

Preferably, the image enhancement processing is one of highlighting, sharpening, and Gaussian filtering.

Preferably, the pore images that identify each enhanced picture include:

Binarize the enhanced image with grayscale;

The pore image is segmented and identified from the binarized scanned image.

Another aspect of the present invention is to provide a rapid evaluation and inspection system for cooling materials, including:

The image scanning unit scans with a scanning electron microscope to obtain images before and after suction of different cooling materials, or scans with a scanning electron microscope to obtain images before and after suction of cooling materials processed into cooling sections through different processes;

An image processing unit, used to enhance the image effects of the original picture before suction and the original picture after suction, and obtain the enhanced picture;

An image recognition unit, used to identify the pore image in the enhanced image;

The comparison evaluation unit is used to compare the hole diameter and hole number between materials, processes, or with the input comparison range, and qualitatively evaluate and determine the cooling effect of the cooling material.

Preferably, if there are more than 5 channel bundles in the comparison range of Rmin>20B and RMAX>100B, it is qualified.

In addition, after selecting materials with better cooling effects, the materials are processed. The processing methods are not limited to molding, folding or gathering to make cooling sections. The cooling sections produced by different processing methods are then processed according to the above evaluation and inspection methods. Evaluation of the cooling effect, so that the best technology for better cooling materials can be screened out.

The evaluation and inspection system and method of the present invention can quickly evaluate a variety of cooling materials, truly reflect the cooling effects of various cooling materials, and speed up the screening of cooling materials. The evaluation and inspection method of the present invention can not only be used for daily rapid inspection of the cooling effect of cooling materials, but also can be used to evaluate the cooling effects after different processing techniques, so as to quickly adjust the combination of cooling materials and techniques to prepare cooling products. The cooling section with better effect avoids the waste of cooling materials.

Description of drawings

Figure 1 is a schematic structural diagram of a heated cigarette according to an embodiment of the present invention, in which there is a smoking section 10, a filter section 20, a hollow support section 21, a cooling section 22, and a lip section 23;

Figure 2 is a picture of the cooling tow before and after use in Example 1;

Figure 3 is a picture of the membrane-paper composite material before and after use in Example 1;

Figure 4 is a picture before and after using the material combination 1 of Example 2;

Figure 5 is a picture before and after using the material combination 2 of Example 2;

Figure 6 is a picture before using the two wrinkle processes in Example 3.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The cooling material mentioned in the present invention is a material used to prepare the cooling section of the heated cigarette as shown in Figure 1.

A rapid evaluation and inspection system for cooling materials, including:

The image scanning unit uses scanning electron microscopy to scan to obtain images of different cooling materials before and after suction, or uses scanning electron microscopy to scan to obtain images of cooling materials processed into cooling sections through different processes before and after suction. Obtain the original picture before suction and the original picture after suction;

The image processing unit is used to enhance the image effect of the original picture before suction and the original picture after suction, and obtain the enhanced picture. The enhancement method is not limited to highlighting, sharpening, Gaussian filtering, etc., as long as the image effect can be enhanced;

The image recognition unit is used to identify the pore image in the enhanced image, specifically by binarizing the enhanced image with grayscale, and segmenting and identifying the pore image from the binarized image;

The comparison evaluation unit is used to compare the pore diameter and number of pores between materials, processes, or with the input comparison range, and qualitatively evaluate and determine the cooling effect of the cooling material. When comparing with the input comparison range, the comparison range is R If there are more than 5 channel bundles with _min >20B and R _MAX >100B, it is qualified. B represents the picture scale, R _min represents the minimum radius size of the hole channel, and R _MAX represents the maximum radius size of the hole channel.

The rapid evaluation and inspection method based on the above-mentioned rapid evaluation and inspection system for cooling materials specifically includes the following steps:

S1. For two or more cooling material samples or cooling sections processed by different processes, use a scanning electron microscope to scan the images before and after suction to obtain the original pictures before and after suction;

S2. Perform image enhancement processing on the original picture before suction and the original picture after suction. The picture enhancement processing here is not limited to highlighting, sharpening, Gaussian filtering, etc., as long as the picture enhancement effect can be achieved, and then the The enhanced image with grayscale is binarized, and the pore image is segmented and identified from the binarized image;

S3. Identify the pore diameter and number of pores in the pore image, compare the pore diameter and number of pores before and after suction between cooling materials and between different processes, and qualitatively evaluate and determine the cooling effect of the cooling material. In this step, firstly, by comparing the pore diameter and number of pores between cooling materials before and after suction, the cooling material with larger pore diameter and larger number of pores is better; secondly, by comparing the pore diameter and number of pores between different processes. Regarding the hole diameter and number of holes before and after suction, the process used is better if the hole diameter is larger and the number of holes is larger.

S4. Combine the selected better materials and better processes, collect the end batches of cooling materials after adjusting the process parameters, calculate the qualified judgment range through the image system, verify the judgment range again, adjust the parameters, and confirm the judgment Standard, used to scan the end face of mass-produced cooling filter rods to determine whether they are qualified.

The specific applications of the evaluation and inspection method of the present invention are as follows:

Example 1

Two or more cooling materials were made into heated cigarettes as shown in Figure 1, and smoked using smoking tools respectively. The cooling materials before and after smoking were scanned using a scanning electron microscope, and the scanned images were input into the evaluation and inspection system to evaluate Check the original image obtained by scanning, and perform image processing such as highlighting, sharpening, and Gaussian filtering in the image processing unit to enhance the image effect and obtain the image shown in Figure 2 and Figure 3. In Figure 2 and Figure 3, The picture on the left is before suction, and the picture on the right is after suction. Based on the changes in the pore structure in the processed pictures, the cooling materials can be quickly screened. Figure 2 shows that the cooling material was in the shape of filaments before use, retaining a large number of small pores. After use, the pores basically disappeared, which is not conducive to cooling. Based on the changes in the pores, the evaluation and inspection system judged it to be unqualified; Figure 3 shows that the cooling material was in the form of a membrane before use. The paper composite retains many irregular through holes. After use, the corresponding holes shrink, keeping some of the holes open. Therefore, from the comparison between Figure 2 and Figure 3, the cooling effect of the membrane-paper composite material in Figure 3 is better, and the system is judged to be qualified and can be further optimized. The comparison results are shown in Table 1.

Table 1

Example 2

The cooling materials judged qualified by the evaluation and inspection system in the early stage were tested for material thickness combinations according to the evaluation and inspection method of the present invention. After the scanned pictures were processed for image enhancement effects in the image processing unit, the before and after use of material combination 1 was obtained. The pictures are shown in Figure 4, and the before and after pictures of material combination 2 are shown in Figure 5. In Figures 4 and 5, the left picture is the picture before suction, and the right picture is the picture after suction. Figure 4 shows that before the use of material combination 1, there are less than 1 pore bundles with R _min >20B and R _MAX >100B. After use, the pores shrink severely and are seriously blocked, and are judged to be unqualified; Figure 5 shows that material combination 2 has R _min >20B before use. If there are more than 5 channel bundles with R _MAX >100B, the channels shrink after use, and some channels remain unobstructed, it is judged to be basically qualified. The comparison results are shown in Table 2.

Table 2

Based on the above evaluation and judgment results, the material combination is further optimized to find the material combination with the best cooling effect, and the second round of material combinations is continued to use the evaluation and inspection system of the present invention to select a better material combination according to the evaluation and inspection method of the present invention. parameters, and the results are shown in Table 3.

table 3

The data in Table 3 shows that material combination 22 has more than 10 channel bundles with R _min >20B and R _MAX >100B before use. After use, the channels shrink and more channels remain unobstructed. It is a better material combination and has better performance. cooling effect.

Example 3

The cooling materials judged to be qualified by the evaluation and inspection system in the early stage were tested on two different pleat molding processes according to the evaluation and inspection method of the present invention, and the pictures before use were obtained as shown in Figure 6. In Figure 6, the left side shows the picture of the first molding process, and the right side shows the picture of the second molding process. The information in Figure 6 shows that before the use of the first molding process, the number of channel bundles with R _min >20B and R _MAX >100B is less than 3, which is unqualified; the second molding process has more than 5 channel bundles with R _min >20B and R _MAX >100B. , basically qualified. The comparison results are shown in Table 4.

Table 4

Based on the above evaluation and judgment results, the process combination is further optimized to find the process combination with the best cooling effect. The second round of process combination is continued according to the evaluation and inspection method of the present invention to select better process combination parameters. The results are shown in Table 5. shown.

table 5

The data in Table 5 shows that the molding process 23 has more than 11 channel bundles with R _min > 20B and R _MAX > 100B before use. After use, the channels shrink and more channels remain unobstructed. It is a better material and process combination with better performance. Best cooling effect.

Collect the end batches of cooling materials after adjusting the process parameters. The evaluation and inspection system calculates the qualified judgment range, verifies the judgment range again, adjusts the parameters, and determines the judgment standard. Then, scan the end face of the cooling filter rods produced in batches, and directly Used for normal production judgment. After testing, the judgment standard is that if there are more than 5 channel bundles with R _min >20B and R _MAX >100B, it is qualified.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently substituted. Without departing from the purpose and scope of the technical solutions of the present invention, they should all be covered by the claims of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all known technologies.

Claims (3)

1. A rapid evaluation and inspection method for cooling materials, characterized in that the method specifically includes the following steps: S1. For two or more different cooling raw material samples and cooling materials processed by different processes, use a scanning electron microscope to scan the images before and after suction, and obtain the original pictures before and after suction; S2. Perform image enhancement processing on the original pictures before suction and the original pictures after suction, and then identify the pore images of each enhanced picture respectively; S3. Identify the pore diameter and number of pores in the pore image, compare the pore diameter and number of pores before and after suction between different cooling raw materials and between different processes, and qualitatively evaluate and determine the cooling effect of the cooling raw materials and processes; In the S3 step, compare the pore diameter and number of pores before and after suction between different cooling raw materials and between different processes. Those with larger pore diameter and larger number of pores are qualified; The evaluation and inspection method also includes combining the selected better raw materials and better processes, collecting the adjusted end images of the cooling materials in batches, calculating the qualified judgment range through the image system, and verifying the judgment range again to determine Judgment standards are used to scan the ends of mass-produced cooling materials to determine whether they are qualified. 2. A method for rapid evaluation and inspection of cooling materials according to claim 1, characterized in that the image enhancement processing is one of highlighting, sharpening, and Gaussian filtering. 3. A method for rapid evaluation and inspection of cooling materials according to claim 2, characterized in that the pore images that identify each enhanced image include: Binarize the enhanced image with grayscale; The pore image is segmented and identified from the binarized image.