A constant rate of loading coating scratch tester and method

Abstract

This invention discloses a constant-speed, constant-load coating scratch resistance tester and method, belonging to the technical field of ink coating scratch resistance testing. It includes a base, a cantilever frame, a cantilever rod, a scriber, and a sliding stage. The cantilever frame is fixedly connected to the left side of the top surface of the base, and the cantilever rod is hinged to the cantilever frame. The scriber is vertically fixed to the bottom right side of the cantilever rod. The sliding stage is connected to the right side of the base via a horizontal sliding drive mechanism and is located above the base. A fixing mechanism for fixing the sample is provided on the upper surface of the sliding stage, and a loading mechanism is provided on the upper side of the cantilever rod. This invention uses a scriber against the coating, and a set weight is applied to the scriber via the loading mechanism to fix the sample on the upper surface of the sliding stage. By controlling the movement of the sliding stage, the scratching operation on the coating on the sample is achieved. Using a set weight and constant speed ensures consistent force and more accurate scratch resistance assessment.

Description

Technical Field

[0001] This invention relates to the field of ink coating scratch resistance testing technology, specifically to a constant speed and constant load coating scratch resistance tester, and also to a testing method for the constant speed and constant load coating scratch resistance tester. Background Technology

[0002] In the ink printing process, the equipment needs to print a large number of products for a batch. The inventor found that the ink on the surface of products that are printed for a long time is prone to poor ink printing quality and is easy to peel off with slight friction and scratches. The existing product ink coating scratch resistance test usually uses a fingernail or other hard object (coin) to scratch and create scratches to judge. Due to the different force, it is difficult to form an accurate standard for scratch resistance test, and the evaluation is not accurate. Summary of the Invention

[0003] The objective of this invention is to provide a constant speed and constant load coating scratch resistance tester and method, which can achieve accurate scratch resistance evaluation.

[0004] To achieve the objectives of this invention, the technical solution adopted by this invention is as follows: A constant speed and constant load coating scratch resistance tester includes a base, a cantilever frame, a cantilever rod, a scribing needle, and a sliding stage. The cantilever frame is fixedly connected to the left side of the top surface of the base, the cantilever rod is hinged to the cantilever frame, the scribing needle is vertically fixedly connected to the bottom right side of the cantilever rod, the sliding stage is connected to the right side of the base through a horizontal sliding drive mechanism and is located above the base, a fixing mechanism for fixing the sample is provided on the upper surface of the sliding stage, and a loading mechanism is provided on the upper side of the cantilever rod.

[0005] Furthermore, a balance block is fixedly sleeved on the left end of the aforementioned cantilever rod after an extended section of balance cantilever. A cantilever fixing seat extending to the left is fixedly connected to the top of the cantilever frame. A balance limit screw is screwed onto the cantilever fixing seat. A level is installed on the top side of the cantilever rod (the level is indicated when the bubble is centered).

[0006] Furthermore, the aforementioned horizontal sliding drive mechanism adopts a linear sliding module. The base is provided with a receiving cavity, and the linear sliding module is installed in the receiving cavity with its length direction facing the left and right directions of the receiving cavity. The top of the receiving cavity is provided with left and right strip-shaped openings. After the slider of the linear sliding module extends out of the strip-shaped openings, it is fixedly connected to the bottom right side of the sliding table, which can drive the sliding table to move left and right.

[0007] Furthermore, the loading mechanism includes a weight rod and a weight. The weight rod is fixedly connected to the top of the cantilever rod and faces the scribe. At least one weight is used and is movably sleeved on the weight rod.

[0008] Furthermore, the aforementioned fixing mechanism includes a tongue depressor and a locking screw. The bottom left side of the tongue depressor can press the right end of the sample onto the top surface of the sliding table, and the right side is fixedly connected to the sliding table by the locking screw. A ramp surface is provided at the top left end of the tongue depressor.

[0009] Furthermore, a sample positioning strip is fixedly connected to the left end of the top surface of the aforementioned sliding stage.

[0010] Furthermore, two sliding stage positioning strips are respectively provided on the left and right sides of the upper surface of the base. The two sliding stage positioning strips are used to limit the left and right travel of the sliding stage, and the distance is sufficient to meet the sliding distance of the scribe on the sample.

[0011] Furthermore, a limiting rod is fixedly connected to the bottom right end of the aforementioned cantilever rod and is located to the right of the scriber. The length of the limiting rod is less than the length of the scriber to ensure that the scriber contacts the sample while the limiting rod does not contact the sample. The lower end of the limiting rod is set as a spherical part.

[0012] A test method using the constant speed and constant load coating scratch resistance tester, the method comprising the following steps: Step 1: Check if the tester is placed horizontally and stably, turn on the power, press the reset button on the tester, drive the sliding stage to move to the left, and let the scribe position return to zero. Step 2: Rotate the balance limit screw on the left end of the cantilever rod downwards to raise the right end of the cantilever rod, making it easier to fix the sample on the scribe plate and ensure that the bottom end is in close contact with the sample placement surface on the upper surface of the sliding stage. Rotate the balance limit screw upwards to lower the right end of the cantilever rod, so that the limit rod rests against the slope of the pressure plate and the scribe needle does not contact the sample. Step 3: Place the required weight on the cantilever bar; press the start button on the tester to start the tester, so that the sliding stage moves to the right. As the limit bar gradually slides down, the scriber contacts the coating on the upper surface of the sample and scratches the coating. When the set position is reached, it stops automatically. Loosen the fixing mechanism, remove the sample, and check whether the coating of the sample is damaged. Step 4: Reinstall the sample and ensure the scriber can reach different positions on the sample coating. Lock the fixing mechanism, reset and control the scriber to repeat the test at different positions on the same sample. Increase the weights gradually until the scriber marks on the coating surface show obvious changes or the weights are used up. Step 6: After the test is completed, return the scriber to its initial position to begin the next scribe. Step 7: Determine the minimum load that will damage the glossy pearlescent ink layer: Start with a small load, then gradually increase the load until the ink coating shows scratches or a white edge appears. The load weight at this point is the maximum load weight that the sample can withstand. Send the sample to a cigarette wrapping machine in a cigarette factory for wrapping cigarettes. If it meets the production requirements, the minimum scratch resistance load of the product can be determined.

[0013] Compared with the prior art, the present invention uses a scratching needle against the coating and a loading mechanism to apply a set weight to the scratching needle, and fixes the sample on the upper surface of the sliding plate. By controlling the movement of the sliding plate, the scratching operation on the coating of the sample can be achieved. The use of a set weight and constant speed can ensure consistent force and more accurate judgment of scratch resistance. Attached Figure Description

[0014] Figure 1 A three-dimensional structural diagram of a constant speed and constant load coating scratch resistance tester; Figure 2 This is a front view schematic diagram of a constant speed and constant load coating scratch resistance tester. Figure 3 This is a top view of the base structure. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific examples.

[0016] Example 1: As Figure 1-3 As shown, a constant speed and constant load coating scratch resistance tester is suitable for detecting and judging the ink layer of glossy pearlescent packaging paper products printed by gravure printing and screen printing processes. It includes a base 1, a cantilever frame 2, a cantilever rod 3, a scribing needle 4, and a sliding stage 5. The cantilever frame 2 is fixedly connected to the left side of the top surface of the base 1. The cantilever rod 3 is hinged to a U-shaped groove 201 provided on the top of the cantilever frame 2 via a hinge shaft 6. The scribing needle 4 is vertically fixedly connected to the bottom right side of the cantilever rod 3. The sliding stage 5 is connected to the right side of the base 1 via a horizontal sliding drive mechanism 7 and is located above the base 1. A fixing mechanism 9 for fixing a sample 8 is provided on the upper surface of the sliding stage 5. A loading mechanism 10 is installed on the upper side of the cantilever rod 3. During the test, the sample (a shiny pearlescent packaging paper product with an ink layer) is placed in the sample placement area on the top surface of the sliding table and fixed by a fixing mechanism. The loading mechanism loads a set weight onto the cantilever rod, and the scribing needle is placed on the ink layer on the top right side of the sample. The horizontal sliding drive mechanism 7 is controlled to drive the sliding table to move to the right at a set speed, scratching the ink layer of the sample. According to different weight configurations of the loading mechanism, scratches can be made at different positions on the same sample. This scratch resistance test is conducted with a set weight and constant speed, which can ensure consistent force and more accurate scratch resistance judgment.

[0017] The scriber 4 is fixedly connected to the scriber seat 401, which is fixedly connected to the bottom of the cantilever rod 3. The lower end of the scriber 4 is set as a hemispherical hard metal needle tip with a radius of (0.50±0.01) mm; test load: 0.5N / 1N / 2N / 5N / 10N (±0.01N).

[0018] To balance the weight of the left and right ends of the cantilever rod 3, a balance cantilever section 11 extending from the left end of the cantilever rod 3 is provided, and a balance block 12 is fixedly sleeved thereon. The balance block 12, which acts as a counterweight, helps to keep the two ends of the cantilever rod balanced, and thus makes it easier to lift the right end of the cantilever rod. A cantilever fixing seat 13 extending to the left is fixedly connected to the top of the cantilever frame 3. A balance limit screw 14 is screwed onto the cantilever fixing seat 13. After the balance limit screw 14 is rotated downward, it can lift the right end of the cantilever rod upward. A pressure block 15 is fixedly connected to the lower end of the balance limit screw 14. The pressure block makes it easier to press the balance cantilever section. A level 16 is installed in the middle of the top side of the cantilever rod 3. The level 16 can measure the horizontality of the cantilever rod, thereby ensuring that the scriber can remain horizontal and the scratch force is consistent during the pulling process on the coating surface.

[0019] To achieve precise, stable, and constant-speed movement of the sliding table 5, the horizontal sliding drive mechanism 7 adopts a linear sliding module. The linear sliding module has a body 701, a slider 702, and a servo motor 703. The servo motor 703 drives the slider to move along the length of the body 701. The linear sliding module drives the scribe to move at a speed of 35mm / s ± 5mm / s. A receiving cavity 101 is provided inside the base 1. The body 701 of the linear sliding module is installed inside the receiving cavity 101, with the length of the body 701 of the linear sliding module facing the left and right directions of the receiving cavity 101. The top of the receiving cavity 101 is provided with left and right strip-shaped openings 102. The slider 702 of the linear sliding module extends out of the strip-shaped openings 102 and is fixedly connected to the bottom right side of the sliding table 5. The slider 702 of the linear sliding module can drive the sliding table 5 to move left and right. Using a high-precision linear sliding module to drive the sliding table to move left and right can ensure the stability of the scratch and the precise control of the walking speed. It is placed inside the base to reduce the space occupied. The base 1 has height adjustment feet 103 installed at the four corners of its bottom to facilitate leveling of the tester's base.

[0020] The loading mechanism 10 includes a weight rod 1001 and a weight 1002. The weight rod 1001 is fixedly connected to the top of the cantilever rod 1002 and faces the scribe 4. At least one weight 1002 is used and is movably sleeved on the weight rod 1001. This structure can quickly achieve loading of different weights, and the installation is convenient and quick. For weights of a fixed weight, the loaded weight is easy to calculate.

[0021] The fixing mechanism 9 includes a tongue depressor 901 and a locking screw 902. The bottom left side of the tongue depressor 901 can press the right end of the sample 8 to the top surface of the sliding table 5. The right side of the tongue depressor 901 is fixedly connected to the sliding table 5 by two locking screws 902 arranged front and back. The top left end of the tongue depressor 901 is provided with a slope surface 903. The sample is locked by the tongue depressor and the locking screw. The locking is stable and reliable. Reliable operation can be achieved during the process of the scriber scratching to the left.

[0022] To quickly achieve left and right positioning of the sample, a sample positioning strip 17 is fixedly connected to the left end of the top surface of the sliding stage 5. Through the sample positioning strip 17, the left end of the cut sample can be quickly placed against the sample positioning strip 17 to achieve rapid positioning, and it is convenient to fix the right end of the sample with a fixing mechanism.

[0023] In order to limit the effective stroke of the sliding stage, two sliding stage positioning strips 18 are respectively provided on the left and right sides of the upper end face of the base 1. The two sliding stage positioning strips 18 are used to limit the left and right travel of the sliding stage 5, and the distance is sufficient to meet the sliding distance of the scribe 4 on the sample 8, so as to effectively limit the safe stroke of the sliding stage in the left and right directions.

[0024] The bottom right end of the cantilever rod 3 is fixedly connected to a limiting rod 19 located to the right of the scriber 3. The length of the limiting rod 19 is less than the length of the scriber to ensure that the scriber contacts the sample while the limiting rod does not contact the sample. The lower end of the limiting rod is set as a spherical part 20. The limiting rod 19 can abut against the slope of the pressure plate to ensure that the scriber remains suspended when not in use.

[0025] The front of the tester (base) is equipped with a reset button 23, a start button 22, and a power button 21. The reset button 23, start button 22, and power button 21 are all connected to the controller. The controller is connected to the servo motor of the linear sliding module. The reset button 23, start button 22, and power button 21 can control the servo motor to drive the sliding table to reset, start the scratch operation, and start the power of the tester through the controller.

[0026] Example 2: A test method for a constant speed and constant load coating scratch resistance tester, applicable to the detection and determination of the ink layer of glossy pearlescent packaging paper products printed by gravure printing and screen printing processes, specifically the glossy pearlescent ink layer of Guiyan (Kuayue) carton and box trademark paper. Before testing, sample storage, sample sampling and sample preparation are carried out.

[0027] Sample storage: Before the experiment, samples are taken from the production site, packaged in sealed moisture-proof plastic bags, and brought into the laboratory.

[0028] Sample taking: Sampling should be representative, and samples should only be taken from the product after the production equipment has been producing more than 3,000 sheets in normal operation.

[0029] Sample preparation: Cut the sample into a 200mm×100mm rectangle, ensuring that the ink layer is in the center.

[0030] The method includes the following steps: Step 1: Check if the tester is placed horizontally and stably, turn on the power, press the reset button on the tester, drive the sliding stage to move to the left, and let the scribe position return to zero. Step 2: Rotate the balance limit screw on the left end of the cantilever rod downwards to raise the right end of the cantilever rod, making it easier to fix the sample on the scribe plate and ensure that the bottom end is in close contact with the sample placement surface on the upper surface of the sliding stage. Rotate the balance limit screw upwards to lower the right end of the cantilever rod, so that the limit rod rests against the slope of the pressure plate and the scribe needle does not contact the sample. Step 3: Place the required weight on the cantilever bar; press the start button on the tester to start the tester, so that the sliding stage moves to the right. As the limit bar gradually slides down, the scriber contacts the coating on the upper surface of the sample and scratches the coating. When the set position is reached, it stops automatically. Loosen the fixing mechanism, remove the sample, and check whether the coating of the sample is damaged. Step 4: Reinstall the sample and ensure the scriber can reach different positions on the sample coating. Lock the fixing mechanism, reset and control the scriber to repeat the test at different positions on the same sample. Increase the weights gradually until the scriber marks on the coating surface show obvious changes or the weights are used up. Step 6: After the test is completed, return the scriber to its initial position to begin the next scribe. Step 7: Determine the minimum load that will damage the glossy pearlescent ink layer: Start with a small load, then gradually increase the load until the ink coating shows scratches or a white edge appears. The load weight at this point is the maximum load weight that the sample can withstand. Send the sample to a cigarette wrapping machine in a cigarette factory for wrapping cigarettes. If it meets the production requirements, the minimum scratch resistance load of the product can be determined.

[0031] Specify the minimum load that the product needs to meet, and then test each sample three times each time using the same load and testing method. If none of the three scratches are damaged and show white edges, record the result as "pass"; otherwise, record the result as "fail".

[0032] If necessary, a magnifying glass can be used to observe and assess the extent of damage caused by the scratches. The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A constant speed and constant load coating scratch resistance tester, characterized in that, It includes a base, a cantilever frame, a cantilever rod, a scribing needle, and a sliding stage. The cantilever frame is fixedly connected to the left side of the top surface of the base, the cantilever rod is hinged to the cantilever frame, the scribing needle is vertically fixedly connected to the bottom right side of the cantilever rod, the sliding stage is connected to the right side of the base through a horizontal sliding drive mechanism and the sliding stage is located above the base, the upper surface of the sliding stage is provided with a fixing mechanism for fixing the sample, and a loading mechanism is provided on the upper side of the cantilever rod.

2. The constant speed and constant load coating scratch resistance tester according to claim 1, characterized in that, A balance block is fixedly sleeved on the left end of the cantilever rod after an extension of the balance cantilever section. A cantilever fixing seat extending to the left is fixedly connected to the top of the cantilever frame. A balance limit screw is screwed onto the cantilever fixing seat. A level is installed on the top side of the cantilever rod.

3. The constant speed and constant load coating scratch resistance tester according to claim 1, characterized in that, The horizontal sliding drive mechanism adopts a linear sliding module. The base is provided with a receiving cavity, and the linear sliding module is installed in the receiving cavity with the length direction of the linear sliding module facing the left and right directions of the receiving cavity. The top of the receiving cavity is provided with left and right strip-shaped openings. After the slider of the linear sliding module extends out of the strip-shaped openings, it is fixedly connected to the bottom right side of the sliding table, which can drive the sliding table to move left and right.

4. A constant speed and constant load coating scratch resistance tester according to claim 1 or 2, characterized in that, The loading mechanism includes a weight rod and weights. The weight rod is fixedly connected to the top of the cantilever rod and faces the scribe. At least one weight is used and is movably sleeved on the weight rod.

5. The constant speed and constant load coating scratch resistance tester according to claim 1, characterized in that, The fixing mechanism includes a tongue depressor and a locking screw. The bottom left side of the tongue depressor can press the right end of the sample to the top surface of the sliding table. The right side is fixedly connected to the sliding table by a locking screw. The top left end of the tongue depressor is provided with a slope.

6. The constant speed and constant load coating scratch resistance tester according to claim 5, characterized in that, A sample positioning strip is fixedly connected to the left end of the top surface of the sliding stage.

7. The constant speed and constant load coating scratch resistance tester according to claim 4, characterized in that, Two sliding stage positioning strips are respectively provided on the left and right sides of the upper end face of the base. The two sliding stage positioning strips are used to limit the left and right travel of the sliding stage, and the distance is sufficient to meet the sliding distance of the scribe on the sample.

8. The constant speed and constant load coating scratch resistance tester according to claim 3, characterized in that, A limiting rod is fixedly connected to the bottom right end of the cantilever rod and is located to the right of the scribe. The length of the limiting rod is less than the length of the scribe to ensure that the scribe contacts the sample while the limiting rod does not contact the sample. The lower end of the limiting rod is set as a spherical part.

9. A test method using a constant speed and constant load coating scratch resistance tester as described in any one of claims 1-8, characterized in that, The method includes the following steps: Step 1: Check if the tester is placed horizontally and stably, turn on the power, press the reset button on the tester, drive the sliding stage to move to the left, and let the scribe position return to zero. Step 2: Rotate the balance limit screw on the left end of the cantilever rod downwards to raise the right end of the cantilever rod, making it easier to fix the sample on the scribe plate and ensure that the bottom end is in close contact with the sample placement surface on the upper surface of the sliding stage. Rotate the balance limit screw upwards to lower the right end of the cantilever rod, so that the limit rod rests against the slope of the pressure plate and the scribe needle does not contact the sample. Step 3: Place the required weight on the cantilever bar; press the start button on the tester to start the tester, so that the sliding stage moves to the right. As the limit bar gradually slides down, the scriber contacts the coating on the upper surface of the sample and scratches the coating. When the set position is reached, it stops automatically. Loosen the fixing mechanism, remove the sample, and check whether the coating of the sample is damaged. Step 4: Reinstall the sample and ensure the scriber can reach different positions on the sample coating. Lock the fixing mechanism, reset and control the scriber to repeat the test at different positions on the same sample. Increase the weights gradually until the scriber marks on the coating surface show obvious changes or the weights are used up. Step 6: After the test is completed, return the scribe to its initial position to begin the next scribe.

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