Method for determining scratch resistance standard and quality detection standard of thermal paper, and detection method and equipment

Abstract

The application provides a heat-sensitive paper scratch resistance standard, a quality detection standard determination method, a detection method and equipment. The heat-sensitive paper scratch resistance equipment applies different pressures to a scratch head through a pressure device, cooperates with different speeds, and performs scratch resistance testing on the heat-sensitive paper under the same scratch testing material, different testing speeds and different testing pressures. The heat-sensitive paper scratch resistance quality detection method is used for detection according to the testing result. The testing method is scientific, has strong repeatability, and the testing result is stable. The quality of the product can be judged according to the testing result to determine whether the quality meets the requirements. For the unqualified product, loss can be stopped in time, and resource waste is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of papermaking, and particularly relates to a method for determining a scratch-resistant standard and a quality detection standard of thermal paper, and a detection method and equipment. BACKGROUND

[0002] In our life, thermal paper is used in the fields of fax, cash register, ticket, lottery, express delivery, etc. Due to transportation, handling and other use processes, the color of the font on the surface of the thermal paper fades, the font is worn, and other phenomena occur, which brings inconvenience to the use of the thermal paper.

[0003] For the detection of the scratch resistance of the thermal paper, the national standard GB / T28210-2011 stipulates the test method and test standard of the scratch resistance performance in the image preservation performance of the thermal paper. The test equipment is a Buddha format wear tester, the diameter of the circular grinding head is 40 mm, and the linear reciprocating speed is (160±10) times / min; the test method is as follows: a blank sample of 130 mm×95 mm is cut, the color developing surface of the sample is upward, and the sample is fixed on the grinding plate of the instrument; a circular saturated sample with a diameter of 40 mm is cut, the color developing surface is outward, and the sample is installed on the grinding head; the sample is rubbed for 100 times under the condition of a spring tension of 4.9 N; the color developing sample after the test is taken down, and the optical density value is measured. According to the measured optical density value, it is determined whether the produced product meets the national standard. This standard is used to test the scratch resistance performance of ordinary thermal paper, and basically meets the requirements of the customers according to the test conditions and standards stipulated in the national standard. However, for the thermal paper with a protective layer on the outermost layer and with high requirements of the customers, such as the thermal paper with scratch resistance, if the test of the scratch resistance performance is still carried out according to the test method of the national standard, although the test result still meets the national standard, the produced thermal paper cannot meet the requirements of the customers according to the test method.

[0004] The traditional test method of the scratch resistance performance of the thermal paper with a protective layer is generally to rub the surface of the thermal paper with a nail, a pen head and other materials. Due to the existence of different test conditions, such as different materials, different force application, different test speeds and human intervention, the scratch marks on the surface of the thermal paper are different, the different scratch marks affect the test result of the optical density of the thermal paper, and thus affect the judgment of the test result of the scratch resistance performance of the thermal paper with a protective layer. Not only does it cause trouble to the customers using the thermal paper, but also increases the production cost of the thermal paper manufacturer, and causes waste of resources.

[0005] It is an urgent problem to be solved to find a new scratch resistance test method with stable test speed, same test material, reduced human intervention and the ability to determine whether the test result meets the requirements of the customers. SUMMARY

[0006] In order to solve the problem of different test materials, different test speeds, human intervention and other factors affecting the test results of thermal paper scratch resistance, the application provides a thermal paper scratch resistance standard, a quality detection standard determination method, a detection method and equipment.

[0007] The application is realized by the following way:

[0008] The method for determining the scratch resistance standard of the scratch-resistant thermal paper comprises the following steps:

[0009] (1) Provide thermal paper with different scratch resistance levels for the same purpose, and divide the thermal paper into A1, A2, A3…An categories according to the scratch resistance level;

[0010] (2) Put the thermal paper of different categories into the same industry where scratches occur for use;

[0011] (3) Collect the used thermal paper and classify it according to A1, A2, A3…An categories;

[0012] (4) Select the categories in step (3) and perform preliminary screening, as long as a thermal paper sample with severe scratches and illegible characters appears in each category, the category is directly determined as unqualified, and the thermal paper in the category is excluded;

[0013] (5) Select the thermal paper with recognizable characters in step (4) in each category, and perform optical density testing on the thermal paper with severe scratches and difficult-to-recognize characters, and record the optical density data. Compare the optical density data, and determine the maximum optical density value as the qualified third-level scratch resistance standard. The thermal paper with an optical density value less than the optical density value is the qualified third-level scratch-resistant thermal paper.

[0014] The method for determining the quality detection standard of the scratch-resistant thermal paper comprises the following steps:

[0015] (1) Provide thermal paper with different scratch resistance levels for the same purpose, and divide the thermal paper into A1, A2, A3…An categories according to the scratch resistance level;

[0016] (2) Put the thermal paper of different categories into the same industry where scratches occur for use;

[0017] (3) Collect the used thermal paper and classify it according to A1, A2, A3…An categories;

[0018] (4) Select the subcategory in step (3) above, and perform preliminary screening respectively. In each subcategory, as long as there is a thermal paper sample with severe scratches and illegible characters, the subcategory is directly determined as unqualified, and the thermal paper in this subcategory is excluded;

[0019] (5) The thermal paper with legible characters remaining in step (4) above is selected by visual inspection in each subcategory to find thermal paper with relatively severe scratches and relatively difficult-to-identify characters. The optical density test is performed at the non-character position of the thermal paper, and the optical density data is recorded. The optical density data is compared, and the maximum value of the optical density value is determined as the optical density value of the qualified third-level scratch-resistant standard. The thermal paper with an optical density value less than the optical density value is the qualified third-level scratch-resistant thermal paper;

[0020] (6) The thermal paper in each subcategory corresponding to step (5) is subjected to scratch resistance test under different pressure and the same acceleration conditions. The optical density value is detected and the data is recorded. In the recorded data, a group of optical density values corresponding to the optical density value of the third-level scratch-resistant standard in the corresponding subcategory of step (5) is selected. A group of pressure values and a group of speed values corresponding to the group of optical density values are determined. The average value of the group of pressure values is determined as the qualified third-level thermal paper quality detection pressure value. The range value of the group of speed values is the qualified third-level thermal paper quality detection speed range value. The average speed of the group of speed values is used to calculate the corresponding acceleration. The test distance is set to S. At 1 / 2S, the average speed corresponding to the group of speed values is calculated to obtain the corresponding acceleration value, which is the minimum acceleration value of the qualified third-level thermal paper quality detection;

[0021] (7) The optical density value of the thermal paper with scratches and clear characters is determined as the qualified second-level scratch-resistant standard optical density value according to steps (3)-(6) above. The qualified second-level thermal paper quality detection pressure value, the qualified second-level thermal paper quality detection speed range value, and the minimum acceleration value of the qualified second-level thermal paper quality detection are determined;

[0022] (8) The optical density value of the thermal paper without scratches and clear characters is determined as the qualified first-level scratch-resistant standard optical density value according to steps (3)-(6) above. The qualified first-level thermal paper quality detection pressure value, the qualified first-level thermal paper quality detection speed range value, and the minimum acceleration value of the qualified first-level thermal paper quality detection are determined.

[0023] The quality detection method of the scratch-resistant thermal paper comprises the following steps:

[0024] (1) produce different levels of scratch resistance of thermal paper, according to the corresponding qualified level of scratch resistance of thermal paper quality detection standard pressure value and qualified level of scratch resistance of thermal paper quality detection standard minimum acceleration value under the condition of different use, carry out scratch resistance test, and test the optical density value of scratch mark, compare the qualified level of scratch resistance standard optical density value, find out the same optical density value as the qualified level of scratch resistance standard optical density value, and calculate the speed of the same optical density value position as the qualified level of scratch resistance standard optical density value, and the speed in the corresponding qualified level of scratch resistance standard quality detection speed range value is qualified, otherwise it is unqualified;Or after the above-mentioned scratch resistance test, determine the specific position range of the qualified level of scratch resistance standard quality detection speed range value, and test the optical density value in the position range, and compare the test optical density value with the qualified level of scratch resistance standard optical density value, which is the same as the qualified level of scratch resistance standard optical density value, otherwise it is unqualified.

[0025] The paper scratch resistance equipment, including the motor 1 arranged on the base 2, the output shaft 3 of the motor 1 is fixed with the rotating wheel 4, the motor 1 is an acceleration motor, the rotating wheel 4 is provided with the paper clamping mechanism 5, at least one scratch head 6 is arranged on the radial outer surface of the rotating wheel 4, and the scratch head 6 is provided with the device 30 for applying different pressure to the rotating wheel 4.

[0026] The paper clamping mechanism 5 comprises a clamping plate 51, and a rotating bolt rod 52 passes through the clamping plate 51 and is matched with the screw hole of the rotating wheel 4.

[0027] The scratch head 6 is made of polytetrafluoroethylene.

[0028] The device 30 for applying different pressure to the rotating wheel 4 is connected with the sliding rod 8 of the scratch head 6, the sliding rod 8 is arranged in the sliding sleeve 9 of the support 7 and slides in the sliding sleeve 9, and the component 10 for containing the weight is arranged on the sliding rod 8.

[0029] The device 30 for applying different pressure to the rotating wheel 4 is connected with the transmission rod 11 of the scratch head 6, the transmission rod 11 abuts against one end of the spring 12, the other end of the spring 12 is provided with a pressing mechanism, so that the spring 12 generates different pressure.

[0030] The pressing mechanism is arranged in the sleeve 14, one end of the sleeve 14 is matched with the screw rod 15 to form a screw pair, one end of the screw rod 15 is the rotating handle 16, the other end of the screw rod 15 abuts against the spring 12, the sleeve 14 is fixed with the support 7, and the rotating screw rod 15 can press the spring 12.

[0031] Compared with the prior art, the beneficial effects of the present application are as follows:

[0032] 1. The scratch resistance testing equipment of the present invention uses springs or weights to apply different pressures to the scratch head, which can realize the scratch resistance test of thermal paper under the same scratch test material, different test speeds, and different test pressures, and measure its optical density value. The test method is scientific, highly repeatable, and the test results are stable, which can realize the determination of whether the product quality meets the requirements based on the test results.

[0033] 2. This invention provides a method and equipment for determining the scratch resistance standards and quality inspection standards of thermal paper. Based on the scratch resistance standards and quality inspection standards provided by this invention, the scratch resistance standards, quality inspection standards, scratch resistance testing equipment, and testing methods for different types of thermal paper can be determined. Different scratch resistance testing methods and quality inspection standards for thermal paper can be formulated according to different customer requirements, thereby saving thermal paper manufacturers' scratch resistance testing costs and improving enterprise efficiency. At the same time, it facilitates the determination of thermal paper quality during the production process, enabling timely loss prevention and control of defective products and reducing resource waste. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the thermal paper scratch resistance testing equipment.

[0035] Figure 2 This is a schematic diagram of a pressure device with a spring structure.

[0036] Figure 3 This is a schematic diagram of a pressure device with a weight structure.

[0037] Figure 4 This is a schematic diagram of the support structure.

[0038] Among them, 1 is the motor, 2 is the base, 3 is the output shaft, 4 is the fixed wheel, 5 is the paper clamping mechanism, 6 is the scraping head, 7 is the bracket, 8 is the sliding rod, 9 is the sliding sleeve, 10 is the component that holds the weights, 11 is the transmission rod, 12 is the spring, 14 is the sleeve, 15 is the screw, 16 is the rotating handle, 51 is the clamping plate, 52 is the rotating bolt rod, and 30 is the pressure device pointing to the wheel 4. Detailed Implementation

[0039] The following is a further explanation of the scratch resistance standard, quality inspection standard determination method, and testing method and equipment of the present invention for thermal paper, with reference to the accompanying drawings.

[0040] A method for determining the scratch resistance standard of scratch-resistant thermal paper includes the following steps:

[0041] (1) produce the same use of different scratch resistance of thermal paper, wherein the production of the same use of thermal paper can be used for fax thermal paper, or for cash register thermal paper, or for label thermal paper, according to the different use of thermal paper, thermal paper is divided into different kinds; according to the same use of different scratch resistance of thermal paper, its thermal paper is divided into A1, A2, A3…An small class, other letters, symbols can also be used for classification, as long as the purpose of classification of different scratch resistance of thermal paper can be achieved;

[0042] (2) the above different small class of thermal paper is respectively put into the same industry which appears scratch, for example, the thermal paper used for cash register is put into the industry which uses thermal paper for cash register;

[0043] (3) collect the above used thermal paper, and classify it according to A1, A2, A3…An small class; wherein the classification according to A1, A2, A3…An small class is to mark A1, A2, A3…An small class of thermal paper in step (1), or to use A1, A2, A3…An small class of thermal paper corresponding to a user, so that the collected used thermal paper is classified according to A1, A2, A3…An small class in step (1) according to the mark or different user corresponding to step 1.

[0044] (4) select the small class in step (3) above, and perform preliminary screening respectively. In each small class, as long as there is a thermal paper sample with serious scratch and illegible characters, the small class is directly determined as unqualified, and the thermal paper of the small class is excluded.

[0045] (5) the thermal paper with legible characters remaining in step (4) is selected by visual inspection in each small class, and the thermal paper with serious scratch marks and difficult to identify characters is selected, and the optical density test is performed on the non-character position. The non-character position refers to the whole collected thermal paper being scratched to the same degree. The non-character position here is the position without printed characters and the deepest scratch color, to prevent the accuracy of the test results of optical density from being affected by the character position. The non-character position in the following is the same position, which will not be described below. After the optical density test is performed on the non-character position, the optical density data is recorded. When recording the optical density data, the number of each small class should be corresponding to the optical density data. The optical density data of the remaining small classes is compared, and the maximum value of the test optical density value in the remaining small classes is determined as the optical density value of the qualified third level scratch resistance standard. The thermal paper with optical density value less than the optical density value is the qualified third level scratch resistance thermal paper.

[0046] A method for determining the quality detection standard of scratch resistance thermal paper, comprising the following steps:

[0047] (1) production of thermal paper with the same use and different scratch resistance, wherein the thermal paper with the same use can be thermal paper for facsimile, or thermal paper for cash register, or thermal paper for label, and the thermal paper is classified into different categories according to different uses; the thermal paper with the same use and different scratch resistance is classified into A1, A2, A3…An categories, or other letters or symbols can be used for classification, as long as the purpose of classifying thermal paper with different scratch resistance can be achieved;

[0048] (2) the thermal paper of different categories is used in the same industry where scratch occurs, for example, the thermal paper for cash register is used in the industry where thermal paper is used for cash register;

[0049] (3) the used thermal paper is collected and classified according to A1, A2, A3…An categories; wherein the classification according to A1, A2, A3…An categories is that the thermal paper of A1, A2, A3…An categories is marked in step (1), or the thermal paper of each A1, A2, A3…An category corresponds to a user, so that the used thermal paper is classified according to A1, A2, A3…An categories according to the marking in step (1) or the corresponding number in step 1 corresponding to different users in step (3);

[0050] (4) the categories in step (3) are selected and preliminarily screened, and in each category, as long as there is a thermal paper sample with serious scratch and illegible characters, the category is directly determined as unqualified, and the thermal paper of the category is excluded;

[0051] (5) the thermal paper with legible characters in step (4) is selected by visual inspection in each category, and the thermal paper with serious scratch marks and difficult-to-identify characters is selected, and the optical density test is performed on the non-character position, and the optical density data is recorded, wherein the optical density data is distinguished, and the number of each category corresponds to the optical density data; the optical density data of the remaining categories is compared, the maximum value of the test optical density value in the remaining categories is determined as the optical density value of the third-level scratch resistance standard, and the thermal paper with optical density value less than the optical density value is the qualified third-level scratch resistance thermal paper;

[0052] (6) In the condition of the same acceleration under different pressure, the thermal paper of each sub-class corresponding to step (5) is subjected to scratch resistance test. According to the actual test needs, different pressure or different acceleration can be set in the exploration process to carry out the scratch resistance test. After the scratch resistance test, the distance measuring tool is used to calculate and determine the scratch position of different speeds on the thermal paper after the scratch resistance test according to the test distance and the value of acceleration, and the optical density value corresponding to the scratch position of different speeds is tested, and the data is recorded. When recording the optical density data, the number of each sub-class and the optical density data should be corresponding. In the recorded optical density data, a group of optical density values which are the same as the optical density values of the third level scratch resistance standard in the corresponding sub-class of step (5) are selected from the recorded optical density data, a group of pressure values and a group of speed values corresponding to the group of optical density values are determined, the average value of the group of pressure values is determined as the qualified third level thermal paper quality detection pressure value, the range value of the group of speed values is determined as the qualified third level thermal paper quality detection speed range value, and the average speed of the group of speed values is used to calculate the corresponding acceleration. The test distance is set as S, and the average speed of the group of speed values at 1 / 2S is calculated to obtain the corresponding acceleration value, which is the minimum acceleration value of the qualified third level thermal paper quality detection. The above-mentioned average speed of the group of speed values at 1 / 2S is not absolute, and the average speed of the group of speed values at 2 / 3S can be selected to calculate the corresponding acceleration value. According to the specific needs, the position of the average speed can be selected artificially to calculate the acceleration. As long as the thermal paper is subjected to scratch resistance test, the speed range of the qualified third level thermal paper quality detection can be ensured to fall within the speed range of the tested thermal paper.

[0053] (7) The optical density value of the thermal paper with scratch marks and clear handwriting is determined as the qualified second level scratch resistance standard optical density value according to the above steps (3)-(6), and the qualified second level thermal paper quality detection pressure value, the qualified second level thermal paper quality detection speed range value and the minimum acceleration value of the qualified second level thermal paper quality detection are determined.

[0054] (8) The optical density value of the thermal paper without scratch marks and clear handwriting is determined as the qualified first level scratch resistance standard optical density value according to the above steps (3)-(6), and the qualified first level thermal paper quality detection pressure value, the qualified first level thermal paper quality detection speed range value and the minimum acceleration value of the qualified first level thermal paper quality detection are determined.

[0055] A quality detection method of scratch resistance thermal paper, comprising the following steps:

[0056] (1) Production of thermal paper with different levels of scratch resistance, according to the corresponding qualified level of scratch resistance quality detection standard pressure value and qualified level of scratch resistance quality detection standard minimum acceleration value of thermal paper for different purposes, carry out scratch resistance test, and test the optical density value of scratch marks, compare the qualified level of scratch resistance standard optical density value, find out the optical density value of the same qualified level of scratch resistance standard optical density value, and calculate the speed of the same optical density value position of the qualified level of scratch resistance standard optical density value, and calculate the speed in the corresponding qualified level of scratch resistance standard quality detection speed range value, otherwise it is unqualified; Or after the above-mentioned scratch resistance test, determine the specific position range of the qualified level of scratch resistance standard quality detection speed range value, and test the optical density value in the position range, and compare the same optical density value with the qualified level of scratch resistance standard optical density value, and the same is qualified, otherwise it is unqualified.

[0057] As shown in the accompanying Figure 1 The structure diagram of thermal paper scratch resistance test equipment, including the motor 1 arranged on the base 2, the output shaft 3 of the motor 1 is fixed with the rotating wheel 4, the motor 1 is an acceleration motor, which can realize different acceleration rotation, so as to realize different speed of the fixed rotating wheel 4 on the output shaft 3; The rotating wheel 4 is provided with a paper clamping mechanism 5, and the paper clamping mechanism 5 includes a clamping plate 51, the clamping plate 51 is connected with one end of the rotating positioning screw 52, and the other end of the rotating positioning screw 52 is connected with the rotating wheel 4.

[0058] The installation method of the thermal paper sample in the sample placement area is: cutting the thermal paper sample to pass through the space part between the clamping plate 51 and the rotating wheel 4, manually rotating the positioning screw 52, until the thermal paper between the clamping plate 51 and the rotating wheel 4 is clamped, and the other end of the thermal paper sample is passed through the space part between the clamping plate 51 and the rotating wheel 4 according to the same method, and the positioning screw 52 is manually rotated, until the thermal paper between the clamping plate 51 and the rotating wheel 4 is clamped; The other end of the thermal paper sample can also be selected to be in a suspended state, as long as the sample is not damaged during the scratch resistance test of the thermal paper sample.

[0059] As shown in the accompanying Figure 1As shown, at least one scraping head 6 is provided on the radial outer surface of the rotating wheel 4. There can be 3, 4, or 5 scraping heads; the number of scraping heads 6 is variable and can be set according to actual needs. A device 30 is provided on the scraping head 6 to apply different pressures to the rotating wheel 4. The pressure device 30 can be a pressure device with a spring structure or a pressure device with a weight device; as long as it can apply pressure to the scraping head 6, it can be replaced with other shapes of pressure devices. The scraping head 6 can be a cone, cylinder, square, cube, or even a frustum-shaped solid, as long as it can contact the thermal paper sample. The contact area can be adjusted according to actual needs. Its material can be polytetrafluoroethylene or other materials, as long as it does not scratch or tear the thermal paper sample.

[0060] As attached Figure 3 The schematic diagram shows a pressure device 30 with a weight structure. The scraper head 6 is equipped with a device 30 for applying different pressures to the rotating wheel. The scraper head 6 is connected to a sliding rod 8, which slides within a sliding sleeve 9 of a bracket 7 connected to the output shaft 3. A component 10 for accommodating weights is provided on the sliding rod 8. Adding weights of different weights to the component 10 allows the sliding rod 8 to move up and down. Because the scraper head 6 is connected to the sliding rod 8, the up and down movement of the sliding rod 8 drives the scraper head 6 to move up and down, thus applying different forces to the scraper head 6 based on the weight of the weights. This allows the scraper head 6 to apply different pressures to the thermal paper sample on the rotating wheel 4, achieving different pressure scraping tests. The component 10 for accommodating weights can be circular, square, etc., as long as it can accommodate the weights. The bracket 7 can be fixed to the frame together with the motor, or it can be fixed to the motor housing or the bushing of the output shaft 3, as long as it can be fixed in place.

[0061] As attached Figure 2The schematic diagram shows a pressure device 30 with a spring structure. The scraper head 6 is equipped with a device 30 that applies different pressures to the rotating wheel. The scraper head 6 is connected to a transmission rod 11, which abuts against one end of a spring 12. The other end of the spring 12 has a pressing mechanism that allows the spring 12 to generate different pressures. The spring 12 can be made into a spring structure with different elastic deformations according to the required force. The transmission rod 11 and the connected spring 12 are housed within a sleeve 14. One end of the sleeve 14 is connected to a screw 15 to form a screw pair. One end of the screw 15 is a rotating handle 16, and the other end of the screw 15 abuts against the spring 12. The sleeve 14 is fixed by a bracket 7. Rotating the screw 15 presses the spring 12, thus applying different pressures to the scraper head 6. The aforementioned screw assembly includes a screw 15 with threads on its outer surface. These threads engage with a nut, which is fixed to the upper cover plate of the sleeve 14. This ensures the stability of the spring force as the screw 15 moves up and down, thanks to the nut's fixation on the upper cover plate of the sleeve 14. This, in turn, guarantees the stability of the test pressure, ensuring the scientific validity, stability, and repeatability of the test results. The outer surface of the sleeve 14 has a scale indicating the force magnitude. The up-and-down movement of the screw 15 causes elastic deformation of the spring. The scale indicating the force magnitude is calculated based on Hooke's Law. Alternatively, the outer surface of the sleeve 14 may have a scale indicating the distance the screw 15 has moved, allowing for the calculation of the spring force using Hooke's Law. This, in turn, allows for the calculation of the pressure applied by the scraper head 6 to the thermal paper sample on the rotating wheel 4.

[0062] As attached Figure 4 The schematic diagram of the support structure shown shows that the support 7 is equipped with a sliding sleeve 9. The sleeve 14 in the pressure device 30 with a spring structure is connected to the sliding sleeve 9, and the sliding rod 8 in the pressure device 30 with a weight structure is connected to the sliding sleeve 9, thereby fixing the pressure device 30.

[0063] The sample of the heat-sensitive paper is coated with a heat-sensitive coating before the scratch resistance test, and the surface coated with the heat-sensitive coating faces the scratch head of the scratch resistance equipment. The heat-sensitive coating is rubbed with the scratch head under different pressures and the same acceleration to generate scratch marks with different color depths. The main principle is that the heat-sensitive coating contains a color developing substance, and heat is generated during rubbing, thereby causing the heat-sensitive substance to develop color in advance, so that different color depths of scratch marks appear. The color depth of the scratch marks can be used to judge the scratch resistance of the heat-sensitive paper. For example, for the same type of heat-sensitive paper, under the same pressure and acceleration, the lighter the color of the scratch marks of the tested heat-sensitive paper, the better the scratch resistance of the heat-sensitive paper sample. The optical density value of the scratch marks of the heat-sensitive paper sample after the scratch resistance test can also be tested, and compared with the qualified level scratch resistance standard optical density value, the same optical density value as the qualified level scratch resistance standard optical density value is found out, and the speed at the position of the same optical density value as the qualified level scratch resistance standard optical density value is calculated. If the calculated speed is within the range of the qualified level scratch resistance standard quality detection speed, it is qualified, otherwise it is unqualified. Or after the scratch resistance test, the specific position range of the qualified level scratch resistance standard quality detection speed range is determined, and the optical density value in the position range is tested. If the tested optical density value is the same as the qualified level scratch resistance standard optical density value, it is qualified, otherwise it is unqualified. The above methods can be used to judge the scratch resistance of the heat-sensitive paper, so that the production of the heat-sensitive paper can meet the needs of the customers, and the process can be optimized in time to meet the requirements of the customers, improve the production efficiency of the company, and improve the production benefit.

[0064] The scratch resistance test method of the heat-sensitive paper is simple and easy to operate. Different test conditions can be set according to the needs of different customers, and the detection standard and detection method of the heat-sensitive paper can be specified to improve the production efficiency of the company and improve the production benefit, so that the customers are satisfied with the products.

[0065] Embodiment 1

[0066] The test equipment used in the present application is a scratch resistance test equipment, and the material of the scratch head 6 is a four-fluorine material. The shape of the scratch head 6 is cylindrical, and the diameter of the circular surface in contact with the paper is 10mm±0.2mm. The material and shape of the scratch head 6 can be selected according to actual needs. The type of heat-sensitive paper is a special facsimile type heat-sensitive paper. The scratch resistance standard of the special facsimile type heat-sensitive paper, the quality detection standard determination method and the detection method specifically include the following steps:

[0067] (1) Provide special facsimile type heat-sensitive papers with different scratch resistance levels, and divide the heat-sensitive papers into A1, A2, A3 and A4 subcategories according to the scratch resistance levels;

[0068] (2) The above different small class of thermal paper is respectively put into different customers with scratch, each small class number of special fax class thermal paper corresponds to different customers, and is marked and recorded clearly;

[0069] (3) The above used thermal paper is collected, and the different small class number of special fax thermal paper corresponding to different customers is collected, and is classified according to the small classes of A1, A2, A3 and A4;

[0070] (4) The small classes in the above step (3) are selected for preliminary screening, and the thermal paper with serious scratches and illegible characters in A2 and A3 is directly determined as unqualified, and the thermal paper in A2 and A3 is excluded;

[0071] (5) The characters of the thermal paper remaining in the above step (4) can be recognized, and the thermal paper with serious scratch marks and difficult to recognize characters is selected in A1 and A4, and the optical density test is carried out in the non-character position, and the optical density data is recorded, as shown in Table 1, the optical density data is compared, the maximum value of the optical density value is determined as the optical density value of the qualified third level scratch-resistant standard, and the thermal paper with optical density value less than the optical density value is the qualified third level scratch-resistant thermal paper;

[0072] (6) The thermal paper in A1 and A4 is tested for scratch resistance under the condition of different pressures of 100N-400N and the same acceleration, wherein the acceleration is selected as 2 m / s 2 , 3 m / s 2 , wherein the pressure interval is 50N, the optical density value is detected and the data is recorded, as shown in Tables 2 and 3, the same group of optical density values as the optical density values of the third level scratch-resistant standard in the corresponding small class in step (5) is selected, a group of pressure values and a group of speed values corresponding to the group of optical density values are determined, the average value of the group of pressure values is determined as the qualified third level thermal paper quality detection pressure value, the range value of the group of speed values is determined as the qualified third level thermal paper quality detection speed range value, and the average speed of the group of speed values is used to calculate the corresponding acceleration, and the test distance is set as S, at 1 / 2S, the average speed corresponding to the group of speed values is calculated, and the corresponding acceleration value is the minimum acceleration value of the qualified third level thermal paper quality detection;

[0073] (7) The optical density values of the thermal paper with scratch marks and clear characters are determined as the qualified second level scratch-resistant standard optical density values according to the above steps (3)-(6), and the qualified second level thermal paper quality detection pressure value, the qualified second level thermal paper quality detection speed range value and the minimum acceleration value of the qualified second level thermal paper quality detection are determined;

[0074] (8) According to the above steps (3)-(6), the optical density value of the scratch-free and clear thermal paper is found out, and the first-class standard optical density value of the scratch resistance is determined. The first-class thermal paper quality detection pressure value, the first-class thermal paper quality detection speed range value and the first-class thermal paper quality detection minimum acceleration value are determined.

[0075] (9) The facsimile thermal paper with different scratch resistance is produced. According to the corresponding qualified grade scratch resistance quality detection standard pressure value and the corresponding qualified grade scratch resistance quality detection standard minimum acceleration value, the scratch resistance test is carried out, and the optical density value of the scratch trace is tested. The qualified grade scratch resistance standard optical density value is compared, the optical density value of the same qualified grade scratch resistance standard optical density value is found out, and the speed of the optical density value position of the same qualified grade scratch resistance standard optical density value is calculated. The calculation speed is qualified within the corresponding qualified grade scratch resistance standard quality detection speed range value, otherwise it is unqualified. Or after the above scratch resistance test, the specific position range of the corresponding qualified grade scratch resistance standard quality detection speed range value is determined, and the optical density value in the position range is tested. The same as the qualified grade scratch resistance standard optical density value is qualified, otherwise it is unqualified.

[0076] Table 1: Collection of scratch resistance optical density test data of special facsimile thermal paper after use by customers

[0077]

[0078] Table 2: Scratch resistance optical density test data of special facsimile thermal paper under the condition of different pressure and acceleration 2m / s 2

[0079]

[0080] Table 3: Scratch resistance optical density test data of special facsimile thermal paper under the condition of different pressure and acceleration 3m / s 2

[0081]

[0082] The above is only one preferred embodiment of the present application, and corresponding changes can be made according to different test conditions as needed. It should be noted that for those skilled in the art, without departing from the overall concept of the present application, a number of changes and improvements can be made, which should be considered as the protection scope of the present application.​​

Claims

1. A method for determining the scratch resistance standard of scratch-resistant thermal paper, comprising the following steps: (1) Provide thermal paper with the same purpose but different scratch resistance, and classify the thermal paper into subcategories A1, A2, A3...An according to the scratch resistance; (2) The above-mentioned different types of thermal paper are put into use in the same industry where scratching occurs; (3) Collect the used thermal paper and classify it into subcategories A1, A2, A3...An; (4) Select the subcategories in step (3) above and conduct preliminary screening. In each subcategory, if there is a thermal paper sample that is severely scratched and the writing is illegible, the subcategory is directly judged as unqualified and the thermal paper in this subcategory is excluded. (5) For the remaining thermal paper with legible writing from step (4), visually select the thermal paper with more severe scratch marks and more difficult to legible writing from each sub-category, and perform optical density test on the non-text area and record the optical density data. Compare the optical density data and determine the maximum value of the optical density values ​​as the optical density value of qualified level three scratch-resistant standard. Thermal paper with less than this optical density value is qualified level three scratch-resistant thermal paper.

2. A method for determining the quality inspection standard of scratch-resistant thermal paper, comprising the following steps: (1) Provide thermal paper with the same purpose but different scratch resistance, and classify the thermal paper into subcategories A1, A2, A3...An according to the scratch resistance; (2) The above-mentioned different types of thermal paper are put into use in the same industry where scratching occurs; (3) Collect the used thermal paper and classify it into subcategories A1, A2, A3...An; (4) Select the subcategories in step (3) above and conduct preliminary screening. In each subcategory, if there is a thermal paper sample that is severely scratched and the writing is illegible, the subcategory is directly judged as unqualified and the thermal paper in this subcategory is excluded. (5) For the remaining thermal paper with legible writing from step (4), visually select the thermal paper with more severe scratch marks and more difficult to legible writing from each sub-category, and perform optical density test on the non-text area and record its optical density data. Compare the optical density data and determine the maximum value of the optical density values ​​as the optical density value of qualified level three scratch-resistant standard. Thermal paper with less than this optical density value is qualified level three scratch-resistant thermal paper. (6) For each sub-category of thermal paper corresponding to step (5), a scratch resistance test is conducted under different pressures and the same acceleration conditions. The optical density value is detected and the data is recorded. In the recorded data, a set of optical density values ​​that are the same as the optical density values ​​of the third-level scratch resistance standard in the sub-category corresponding to step (5) is selected. A set of pressure values ​​and a set of speed values ​​corresponding to the set of optical density values ​​are determined. The average value of the set of pressure values ​​is determined to be the pressure value for quality testing of qualified third-level thermal paper. The range value of the set of speed values ​​is the speed range value for quality testing of qualified third-level thermal paper. The average speed of the set of speed values ​​is used to calculate the corresponding acceleration. The test distance is set to S. The average speed of the set of speed values ​​is located at 1 / 2S. The corresponding acceleration value is calculated as the minimum acceleration value for quality testing of qualified third-level thermal paper. (7) According to the above steps (3)-(6), find the optical density value of the thermal paper with scratch marks and clear writing, determine it as the qualified second-level scratch-resistant standard optical density value, and determine the qualified second-level thermal paper quality test pressure value, qualified second-level thermal paper quality test speed range value and qualified second-level thermal paper quality test minimum acceleration value; (8) Following the steps (3)-(6) above, find the optical density value of the thermal paper with no scratches and clear writing, determine it as the qualified grade 1 scratch-resistant standard optical density value, and determine the qualified grade 1 thermal paper quality test pressure value, qualified grade 1 thermal paper quality test speed range value and qualified grade 1 thermal paper quality test minimum acceleration value.

3. A quality testing method for scratch-resistant thermal paper, comprising the following steps: (1) Produce thermal paper with different scratch resistance levels. Under the conditions of pressure value and minimum acceleration value of the qualified grade scratch resistance quality test standard corresponding to different uses of thermal paper, conduct scratch resistance test and test the optical density value of the scratch mark. Compare with the optical density value of the qualified grade scratch resistance standard, find the optical density value that is the same as the optical density value of the qualified grade scratch resistance standard, and calculate the speed of the position of the optical density value that is the same as the optical density value of the qualified grade scratch resistance standard. If the calculated speed is within the range of the qualified grade scratch resistance standard quality test speed, it is qualified; otherwise, it is unqualified. Or, after conducting the above scratch resistance test, determine the specific position range of the qualified grade scratch resistance standard quality test speed range value, and test the optical density value within that position range. If the tested optical density value is the same as the optical density value of the qualified grade scratch resistance standard, it is qualified; otherwise, it is unqualified.

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