A paper surface water absorption tester

Abstract

This utility model discloses a paper surface water absorption tester, relating to the papermaking industry. The paper surface water absorption tester includes a base plate, with two support plates symmetrically fixedly connected to one side of the base plate. A water supply mechanism for paper water absorption is provided between the two support plates. It also includes: a placement boss on the base plate, the placement boss being integrally formed with the base plate; and two sets of mounting seats symmetrically fixedly connected to the base plate and located on both sides of the placement boss. This utility model, through stable motor drive, ensures constant pressure intensity. Throughout the testing process, the pressure deviation of the pressure roller on the paper is minimal, ensuring consistent testing conditions each time, effectively avoiding human interference, making the test results more reliable and repeatable, and enabling the test data to more accurately reflect the true surface water absorption of the paper, providing strong data support for paper quality assessment and process improvement.

Description

Technical Field

[0001] This utility model belongs to the field of papermaking technology, specifically, it relates to a paper surface water absorption tester. Background Technology

[0002] In the production and quality inspection of paper and paperboard, surface absorbency is a key performance indicator, usually determined by the Cobb method. The relevant testing procedures must comply with the GB / T1540-2002 standard specification "Determination of Water Absorbency of Paper and Paperboard - Cobb Method". Traditional paper surface absorbency testers mainly consist of a cup, a cup lid, a pressure roller, and a base plate. During the test, the sample is placed at the opening of the cup, which contains a certain amount of test water. After the paper is in contact with the water for a specified time, absorbent paper is used to cover the surface of the sample. Pressure is applied by the pressure roller to absorb the unabsorbed water. Finally, the Cobb value (the mass of water absorbed per unit area of ​​paper) is calculated by weighing. The testing process requires manual operation of steps such as changing the water and operating the pressure roller, relying on the experience and skill of the operators to ensure the standardization of the testing procedure.

[0003] However, in traditional testing methods, the pressure applied by the pressure roller when using absorbent paper to remove unabsorbed moisture from the paper surface is greatly affected by human operation. Different operators may apply inconsistent pressure due to differences in force habits and operating techniques, or even the same operator may apply inconsistent pressure to the paper due to fluctuations in physical strength and attention over different test runs. This pressure instability directly affects the absorbent paper's ability to absorb residual water on the surface. In other words, too little pressure may result in excessive residual water, while too much pressure may cause the already absorbed water inside the paper to be squeezed out, ultimately causing deviations in the measurement of the absorbent value. This seriously affects the accuracy and repeatability of the test results, making it difficult to meet the needs of accurate evaluation of paper quality. Therefore, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a paper surface water absorption tester that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: a paper surface water absorption tester, including a base plate, two support plates symmetrically fixedly connected to one side of the base plate, a water supply mechanism for paper to absorb water between the two support plates, and further including: a placement boss provided on the base plate, the placement boss being integrally formed with the base plate; two sets of mounting seats symmetrically fixedly connected to the base plate and located on both sides of the placement boss; a lead screw rotatably connected between the two mounting seats in each set; a guide rod fixedly connected between the two mounting seats in each set; a slider slidably connected to the guide rod and threadedly connected to the adjacent lead screw; a pressure roller rolling on the placement boss, the two ends of the pressure roller being rotatably connected to the slider on the same side through a rotating shaft; and a motor fixedly connected to a mounting seat away from the support plate, the output end of the motor being fixedly connected to the end of the lead screw.

[0006] Furthermore, the water supply mechanism includes a water storage cup and a cup lid. A ring of elastic, non-absorbent rubber pads is fixedly connected to the side of the water storage cup that contacts the cup lid. The water storage cup is positioned between two support plates. Rotating rods are fixedly connected to both sides of the water storage cup. The two rotating rods are rotatably connected to the support plates on the same side. A bracket is fixedly connected between the two rotating rods. A screw is threaded onto the bracket. The cup lid is rotatably connected to the lower end of the screw. A crank handle is fixedly connected to the end of one of the rotating rods away from the water storage cup. A support plate is fixedly connected to one of the support plates. A positioning pin is inserted into the support plate. A positioning hole for use with the positioning pin is provided on the rotating rod near the support plate.

[0007] To facilitate automatic water discharge from the water storage cup, a three-way pipe is fixedly connected to the bottom of the water storage cup. The other two ports of the three-way pipe are respectively connected to an inlet pipe and an outlet pipe. Electric valves are installed between the inlet pipe, the outlet pipe, and the three-way pipe. A flow meter is installed between the electric valve on one side of the inlet pipe and an external water pump. The outlet of the outlet pipe is connected to an external wastewater tank. After the paper has absorbed all the water, the electric valve on the outlet pipe is opened, and the remaining water in the storage cup is discharged into the wastewater tank. Then, the electric valve at the outlet pipe is closed, and the electric valve at the inlet pipe and the water pump are opened. Once the flow meter detects an inlet flow rate of 100ml, the electric valve at the inlet pipe is closed.

[0008] To further ensure adequate wastewater discharge, the lower interior of the water storage cup is provided with a conical inclined surface.

[0009] To facilitate flexible loading and unloading of the pressure roller and to strictly limit the pressure applied by the pressure roller to the paper to its own weight, the slider is further provided with a groove, and the end of the rotating shaft extending into the groove is fixedly connected to a limiting circular plate. The limiting circular plate is suspended in the groove, and two I-shaped rollers that cooperate with the limiting circular plate are symmetrically rotatably connected in the groove.

[0010] To ensure the stability of the paper, two sets of mounting plates are symmetrically fixedly connected to the front and rear sides of the base plate where the boss is placed. A mounting shaft is fixedly connected between the two mounting plates in each set. A pressure plate is rotatably connected to the mounting shaft, and a torsion spring is provided between the pressure plate and the mounting plate.

[0011] To facilitate leveling of the base plate, threaded rods are fixedly connected to the four corners of the bottom of the base plate, and support legs are threaded onto the threaded rods.

[0012] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention can ensure constant pressure through stable motor drive. During the entire test process, the pressure deviation of the pressure roller on the paper is minimal, ensuring consistent test conditions each time, effectively avoiding human interference, making the test results more reliable and repeatable, and enabling the test data to more accurately reflect the true surface water absorption of the paper, providing strong data support for paper quality assessment, process improvement, etc.

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] In the attached diagram:

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0017] Figure 3 This is a partial cross-sectional view of the present invention.

[0018] Figure 4 This utility model Figure 1 A schematic diagram of the structure of part A;

[0019] Figure 5 This is a schematic diagram of the unfolded structure of the base plate and the support legs in this utility model.

[0020] In the diagram: 1. Base plate; 101. Placement boss; 102. Threaded rod; 103. Support leg; 104. Pressure plate; 105. Mounting plate; 2. Support plate; 201. Rotating rod; 202. Water storage cup; 203. Cup lid; 204. Bracket; 205. Screw; 206. Handle; 207. Support plate; 208. Positioning pin; 209. Rubber pad; 2010. Conical inclined surface; 3. T-pipe; 301. Electric valve; 302. Flow meter; 4. Mounting base; 401. Lead screw; 402. Guide rod; 403. Motor; 404. Slider; 405. Groove; 406. I-shaped roller; 5. Pressure roller; 501. Rotating shaft; 502. Limiting circular plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0022] Example:

[0023] Reference Figures 1-3 A paper surface water absorption tester includes a base plate 1, two support plates 2 symmetrically fixedly connected to one side of the base plate 1, and a water supply mechanism for paper to absorb water between the two support plates 2. The tester also includes: a placement boss 101 on the base plate 1, the placement boss 101 being integrally formed with the base plate 1; two sets of mounting seats 4 symmetrically fixedly connected to the base plate 1 and located on both sides of the placement boss 101; a lead screw 401 rotatably connected between each set of two mounting seats 4; a guide rod 402 fixedly connected between each set of two mounting seats 4; a slider 404 slidably connected to the guide rod 402 and threadedly connected to the adjacent lead screw 401; a pressure roller 5 rolling on the placement boss 101, with both ends of the pressure roller 5 rotatably connected to the slider 404 on the same side via a rotating shaft 501; and a motor 403 fixedly connected to the mounting seat 4 away from the support plate 2, the output end of the motor 403 being fixedly connected to the end of the lead screw 401.

[0024] The water supply mechanism includes a water storage cup 202 and a cup lid 203. A ring of elastic but non-absorbent rubber gasket 209 is fixedly connected to the side of the water storage cup 202 and the cup lid 203 that are in contact with each other. The water storage cup 202 is set between two support plates 2. Rotating rods 201 are fixedly connected to both sides of the water storage cup 202. The two rotating rods 201 are rotatably connected to the support plates 2 on the same side. A bracket 204 is fixedly connected between the two rotating rods 201. A screw 205 is threaded onto the bracket 204. The cup lid 203 is rotatably connected to the lower end of the screw 205. A crank handle 206 is fixedly connected to the end of one of the rotating rods 201 away from the water storage cup 202. A support plate 207 is fixedly connected to one of the support plates 2. A positioning pin 208 is inserted into the support plate 207. A positioning hole for cooperating with the positioning pin 208 is opened on the rotating rod 201 on the side closer to the support plate 207.

[0025] Before using this tester to test the water absorbency of the paper surface,

[0026] First, a suitable amount of sample is randomly selected from the paper to be tested according to the relevant standard (such as GB / T450). Then, a special sampler is used to cut out samples with uniform size, no defects or wrinkles. Next, the cut samples are placed under standard atmospheric conditions (temperature 23℃±1℃, relative humidity 50%±2%) for pretreatment, which generally takes more than 24 hours until they reach equilibrium.

[0027] After obtaining a qualified sample, check the integrity of all components of the testing instrument, including the base plate 1, support plate 2, water supply mechanism, mounting base 4, lead screw 401, guide rod 402, slider 404, pressure roller 5, motor 403, etc., ensuring there is no damage or looseness. Check the rubber gasket 209 at the contact point between the water storage cup 202 and the cup lid 203 for integrity; if damaged, replace it promptly to ensure a good seal. Then, rotate the rotating rod 201 by cranking the handle 206, thereby causing the water storage cup 202 to rotate around the support plate 2, so that the water storage cup 202... With the opening of 2 pointing vertically upward, insert the positioning pin 208 into the corresponding positioning hole on the rotating rod 201 to fix the position of the water storage cup 202. Then, inject an appropriate amount of distilled water or deionized water into the water storage cup 202. Then, lay the paper to be tested flat on the mouth of the water storage cup 202, ensuring that the mouth of the cup is in the middle of the paper. Then, rotate the screw 205 to move the cup lid 203 downward until it fits tightly against the water storage cup 202. Due to the action of the rubber gasket 209, a good seal is formed, which can effectively prevent water leakage.

[0028] After the paper is secured, the positioning pin 208 can be removed from the positioning hole. Then, the water storage cup 202 can be rotated by the crank handle 206 so that the cup opening is facing down. The positioning pin 208 can be inserted into the positioning hole again to limit the water storage cup 202. Then, the timer is started. After the paper has absorbed the specified amount of water, the process of rotating the water storage cup 202 to the position of the cup opening facing up is repeated. Then, the cup lid 203 is separated from the water storage cup 202, so that the paper that has absorbed the water can be removed.

[0029] While waiting for the paper to absorb water, place the absorbent paper on the placement boss 101. Then, when removing the paper from the water storage cup 202, place the water-contact side of the paper on the absorbent paper. After placing the paper, start the motor 403. The output end of the motor 403 drives the lead screw 401 to rotate. Since the slider 404 is threadedly connected to the lead screw 401 and slides on the guide rod 402, the rotation of the lead screw 401 drives the slider 404 to move on the guide rod 402, thereby driving the pressure roller 5, which is rotatably connected to the slider 404, to roll on the placement boss 101.

[0030] The pressure roller 5 is moved in the opposite direction to press the sample. The rolling of the pressure roller 5 removes excess moisture that has not been absorbed from the paper surface. Here, an electric pressure roller 5 is used instead of manual pressure. The two motors 403 are connected to the same control circuit to achieve synchronous operation. In the control circuit, the same driving parameters, such as voltage and current, are set to ensure that the two motors 403 run at the same speed and direction, thereby driving the pressure rollers 5 on both sides to apply uniform and constant pressure, avoiding the instability of pressure caused by manual operation.

[0031] After rolling, the treated sample is quickly placed in an electronic balance and weighed. The mass m2 after water absorption is recorded. The mass of the sample before water absorption is recorded as m1. The water absorption (Cobb value C) of the sample is calculated according to the specified formula (C=(m2-m1)×100). Multiple samples of the same sample are tested, and their average value, standard deviation and coefficient of variation are calculated to obtain more accurate and reliable test results.

[0032] In traditional methods, when using absorbent paper to remove unabsorbed moisture from the paper surface, the pressure applied by the pressure roller is greatly affected by human operation. Different operators or different operations by the same operator may result in inconsistent pressure, thus affecting the accuracy of the test results. However, this tester automatically drives the pressure roller 5, which is stably driven by the motor 403, ensuring a constant pressure. Throughout the test, the pressure deviation applied by the pressure roller 5 to the paper is minimal, ensuring consistent test conditions for each test. This effectively avoids human interference and makes the test results more reliable and repeatable.

[0033] All components of the instrument work together, from paper placement and water absorption to drying excess moisture, the operation process is smooth and efficient. Motor 403 synchronously drives pressure roller 5 to apply pressure evenly to remove excess moisture, so that the test data can more accurately reflect the true surface water absorption of the paper, providing strong data support for paper quality assessment and process improvement.

[0034] Reference Figure 3 As shown: A three-way pipe 3 is fixedly connected to the bottom of the water storage cup 202. The other two ports of the three-way pipe 3 are respectively connected to the inlet pipe and the outlet pipe. Electric valves 301 are installed between the inlet pipe, the outlet pipe and the three-way pipe 3. A flow meter 302 is installed between the electric valve 301 on one side of the inlet pipe and the external water pump. The outlet of the outlet pipe is connected to an external wastewater tank. After the paper has absorbed all the water, the electric valve 301 on the outlet pipe is opened, and the remaining water in the water storage cup 202 will be discharged into the wastewater tank. Then, the electric valve 301 at the outlet pipe is closed, and the electric valve 301 at the inlet pipe and the water pump are opened. After the flow meter 302 detects that the inlet flow rate is 100ml, the electric valve 301 at the inlet pipe can be closed.

[0035] After the paper has absorbed water, the tester opens the electric valve 301 at the outlet of the three-way pipe 3 at the bottom of the water storage cup 202 through the control system, draining the remaining water in the cup into an external wastewater bucket. After the wastewater is drained, the control system closes the electric valve 301 at the outlet pipe and simultaneously opens the electric valve 301 at the inlet pipe and the external water pump. Water flows into the water storage cup 202 through the inlet pipe. The flow meter 302 monitors the inlet flow rate in real time under the control system. When the detected inlet water reaches 100ml, the control system immediately closes the electric valve 301 at the inlet pipe, thus automatically completing the water replacement operation. This process achieves automatic coordinated operation of the electric valve 301 and the flow meter 302 through the control system, which not only replaces the traditional frequent manual water replacement operation, greatly improving the testing efficiency, but also strictly ensures that the water volume is consistent for each test, avoiding the impact of water volume changes or differences in manual operation on the results. At the same time, it solves the problem of inaccurate results caused by turbid test water in traditional equipment, which meets the requirements of GB / T1540-2002 for the stability of test conditions.

[0036] Reference Figure 3 As shown: A conical inclined surface 2010 is provided at the lower end of the interior of the water storage cup 202.

[0037] The conical inclined surface 2010 at the lower end of the water storage cup 202 allows the remaining water in the cup to converge downwards along the inclined surface to the bottom outlet under the action of gravity. Combined with the drainage structure of the three-way pipe 3 and the electric valve 301, residual water can be drained more thoroughly, avoiding the problem of stagnant water accumulation in traditional flat-bottomed cups. This significantly improves drainage efficiency and cleanliness, meeting the requirements for test water replacement in GB / T1540-2002, and providing a more stable initial condition for subsequent quantitative water replenishment. At the same time, it simplifies the drainage operation process, further reduces manual intervention, and ensures the accuracy of the test.

[0038] Reference Figure 4 As shown: A groove 405 is provided on the slider 404. The end of the rotating shaft 501 extending into the groove 405 is fixedly connected to a limiting circular plate 502. The limiting circular plate 502 is suspended in the groove 405. Two I-shaped rollers 406 that cooperate with the limiting circular plate 502 are symmetrically rotated in the groove 405.

[0039] The groove 405 on the slider 404 cooperates with the limiting circular plate 502 and the I-shaped roller 406. The I-shaped roller 406 forms a stable limit on both sides of the limiting circular plate 502, which can effectively prevent the pressure roller 5 from axially shifting due to uneven force during rolling, ensuring the accuracy of the pressure path. At the same time, the limiting circular plate 502 is suspended in the groove 405 and only rolls in contact with the I-shaped roller 406, avoiding the rigid connection between the slider 404 and the rotating shaft 501 of the pressure roller 5 from generating additional pressure. This ensures that the pressure applied by the pressure roller 5 to the paper is strictly limited to its own weight, ensuring constant pressure and further improving the accuracy of the test results.

[0040] Reference Figures 1-3 As shown: Two sets of mounting plates 105 are symmetrically fixedly connected on the front and rear sides of the mounting boss 101 on the base plate 1. A mounting shaft is fixedly connected between the two mounting plates 105 in each set. A pressure plate 104 is rotatably connected to the mounting shaft. A torsion spring (not shown in the figure) is provided between the pressure plate 104 and the mounting plate 105.

[0041] The mounting plate 105, mounting shaft, pressure plate 104 and torsion spring on the base plate 1 located on the front and rear sides of the mounting boss 101 cooperate to make the pressure plate 104 stably press the paper from both sides with the elastic force of the torsion spring. This design can effectively prevent the paper from shifting or wrinkling due to force during the rolling process of the pressure roller 5, and ensure that the paper always remains flat. It provides a stable sample fixing base for the pressure roller 5 to apply pressure evenly and ensure the reliability of the test results.

[0042] Reference Figure 5 As shown: Threaded rods 102 are fixedly connected to the four corners of the bottom of the base plate 1, and support legs 103 are threadedly connected to the threaded rods 102.

[0043] The threaded rods 102 at the four corners of the bottom of the base plate 1 are threadedly connected to the support legs 103. The height of each corner can be adjusted by rotating the support legs 103, thereby achieving horizontal adjustment of the base plate 1. This ensures that the pressure roller 5 applies pressure and the paper absorbs water during the testing process, and avoids uneven pressure distribution or inconsistent water contact caused by the tilt of the base plate 1. This provides a basic adjustment function for the overall stable operation of the tester and ensures the reliability of the test data.

[0044] It should be noted that the above electrical components are all existing technology products. Those skilled in the art should select, install and complete the circuit debugging work according to the needs of use to ensure that all electrical appliances can work normally. The components are all general standard parts or components known to those skilled in the art. Their structure and principle can be known by those skilled in the art through technical manuals or conventional experimental methods. No specific restrictions are made here.

[0045] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model.

Claims

1. A paper surface water absorption tester, comprising a base plate (1), wherein two support plates (2) are symmetrically fixedly connected to one side of the base plate (1), and a water supply mechanism for supplying water to the paper is provided between the two support plates (2), characterized in that, Also includes: The base plate (1) is provided with a placement boss (101), and the placement boss (101) and the base plate (1) are integrally formed; Two sets of mounting bases (4) are symmetrically fixedly connected to the base plate (1) and located on both sides of the placement boss (101); A lead screw (401) is rotatably connected between each set of two mounting seats (4); The guide rod (402) is fixedly connected between each set of two mounting seats (4); The slider (404) is slidably connected to the guide rod (402) and threadedly connected to the adjacent lead screw (401); The pressure roller (5) rolls on the placement boss (101), and the two ends of the pressure roller (5) are rotatably connected to the slider (404) on the same side through the rotating shaft (501); The motor (403) is fixedly connected to the mounting base (4) away from the support plate (2), and the output end of the motor (403) is fixedly connected to the end of the lead screw (401).

2. The paper surface water absorption tester according to claim 1, characterized in that, The water supply mechanism includes a water storage cup (202) and a cup lid (203). A ring of elastic but non-absorbent rubber pads (209) is fixedly connected to the side of the water storage cup (202) and the cup lid (203) that are in contact with each other. The water storage cup (202) is set between two support plates (2). Rotating rods (201) are fixedly connected to both sides of the water storage cup (202). The two rotating rods (201) are rotatably connected to the support plates (2) on the same side respectively. A bracket (204) is fixedly connected between the two rotating rods (201). A screw (205) is threaded onto the bracket (204), and the cup lid (203) is rotatably connected to the lower end of the screw (205). A crank (206) is fixedly connected to one end of the rotating rod (201) away from the water storage cup (202). A support plate (207) is fixedly connected to one of the support plates (2), and a positioning pin (208) is inserted into the support plate (207). A positioning hole for use with the positioning pin (208) is opened on the rotating rod (201) near the support plate (207).

3. The paper surface water absorption tester according to claim 2, characterized in that, The bottom of the water storage cup (202) is fixedly connected to a three-way pipe (3). The other two ports of the three-way pipe (3) are respectively connected to an inlet pipe and an outlet pipe. An electric valve (301) is installed between the inlet pipe, the outlet pipe and the three-way pipe (3). A flow meter (302) is installed between the electric valve (301) on one side of the inlet pipe and the external water pump. The outlet of the outlet pipe is connected to an external wastewater bucket. After the paper absorbs the water, the electric valve (301) on the outlet pipe is opened, and the remaining water in the water storage cup (202) will be discharged into the wastewater bucket. Then the electric valve (301) at the outlet pipe is closed, and the electric valve (301) at the inlet pipe and the water pump are opened. After the flow meter (302) detects that the inlet flow rate is 100ml, the electric valve (301) at the inlet pipe can be closed.

4. The paper surface water absorption tester according to claim 3, characterized in that, The lower interior of the water storage cup (202) is provided with a conical inclined surface (2010).

5. A paper surface water absorption tester according to claim 1, characterized in that, The slider (404) has a groove (405), and the end of the rotating shaft (501) extending into the groove (405) is fixedly connected to a limiting circular plate (502). The limiting circular plate (502) is suspended in the groove (405), and two I-shaped rollers (406) that cooperate with the limiting circular plate (502) are symmetrically rotatably connected in the groove (405).

6. The paper surface water absorption tester according to claim 1, characterized in that, Two sets of mounting plates (105) are symmetrically fixedly connected on the front and rear sides of the mounting boss (101) on the base plate (1). Each set of two mounting plates (105) is fixedly connected to a mounting shaft. A pressure plate (104) is rotatably connected to the mounting shaft. A torsion spring is provided between the pressure plate (104) and the mounting plate (105).

7. A paper surface water absorption tester according to claim 1, characterized in that, The bottom of the base plate (1) is fixedly connected to four corners with threaded rods (102), and the threaded rods (102) are threaded with legs (103).

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