Paper folding performance testing method and device

Abstract

The invention discloses a paper folding performance testing method and device. The method comprises the steps that paper is controlled to be in a folded state; acquiring pressure information of the paper in a folded state and image information in a paper folding process; and determining the springback angle and stiffness of the paper according to the image information and the pressure information. According to the technical scheme provided by the embodiment of the invention, the paper is controlled to be folded, and the image information in the paper folding process and the pressure information in the folded state are obtained; the difference between the paper before folding and the paper after folding and rebounding is obtained through analysis according to the image information, and therefore the rebounding angle of the paper is obtained through calculation; and the stiffness of the paper is obtained through analysis and calculation according to the pressure information so as to reflect the deformation capacity of the paper in the initial state after the paper is folded. According to the technical scheme provided by the embodiment of the invention, the folding performance of the paper can be efficiently detected, so that the paper meeting the folding performance requirement can be selected during packaging, and the folding effect and the folding efficiency during paper packaging are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of paper folding testing, and in particular to a paper folding performance testing method and device. Background Art

[0002] Paper folding packaging is one of the main packaging forms of commodities and is widely used in the packaging of various products. The folding performance of packaging paper has a great influence on the packaging quality and packaging effect. High-speed packaging machines have high requirements for paper folding performance. Appropriate stiffness and rebound angle can ensure folding effect and folding efficiency. At present, there is a lack of testing methods and equipment for paper folding performance in the market to test the folding performance of packaging paper and improve the folding effect and folding efficiency during paper packaging. Summary of the invention

[0003] The present invention provides a paper folding performance testing method and device, so as to efficiently detect the folding performance of paper, so that paper meeting the folding performance requirements can be selected during packaging, thereby improving the folding effect and folding efficiency during paper packaging.

[0004] According to one aspect of the present invention, a paper folding performance testing method is provided, comprising:

[0005] Control the paper to be in a folded state;

[0006] Obtaining pressure information of the paper in a folded state and image information of the paper during the folding process;

[0007] The rebound angle and stiffness of the paper are determined according to the image information and the pressure information.

[0008] Optionally, obtaining image information during the paper folding process includes:

[0009] First image information before the paper is folded and second image information after the paper rebounds are acquired.

[0010] Optionally, determining the rebound angle and stiffness of the paper according to the image information and the pressure information includes:

[0011] performing straight line extraction on the first image information and the second image information;

[0012] The rebound angle of the paper is determined according to the angle between the extracted straight lines.

[0013] Optionally, controlling the paper to be in a folded state comprises:

[0014] Control the paper to be folded according to the preset folding speed;

[0015] Get the pressure information of the paper in the folded state, including:

[0016] Obtain the rebound pressure of the paper after keeping the paper in a folded state for a preset time.

[0017] Optionally, determining the rebound angle and stiffness of the paper according to the image information and the pressure information includes:

[0018] The stiffness of the paper is determined according to the relationship between the rebound pressure and the length of the paper.

[0019] Optionally, the stiffness is calculated according to the following formula:

[0020]

[0021] Among them, T is stiffness, F is rebound pressure, and L is paper length.

[0022] According to another aspect of the present invention, a paper folding performance testing device is provided, and the paper folding performance testing method provided by any embodiment of the present invention is used for testing. The paper folding performance testing device comprises: an L-shaped base, an image information acquisition module, a pressure information acquisition module and a folding component;

[0023] The L-shaped base comprises a first surface and a second surface that are adjacently connected;

[0024] The image information acquisition module is disposed on a side of the first surface away from the second surface, and is used to acquire image information during the paper folding process;

[0025] The pressure information acquisition module is disposed on the second surface of the L-shaped base and abuts against the paper to be folded, and is used to acquire pressure information during the paper folding process;

[0026] The folding assembly is disposed on the second surface of the L-shaped base and is spaced apart from the pressure information acquisition module. The folding assembly clamps the paper to be folded to control the folding of the paper.

[0027] Optionally, the image information acquisition module includes a camera and a bracket;

[0028] The bracket is arranged perpendicular to the first surface, the camera is arranged on a side of the bracket close to the second surface, and the camera is used to capture image information during the paper folding process.

[0029] Optionally, the folding assembly comprises: a supporting portion and a folding portion arranged opposite to each other perpendicular to the first surface;

[0030] The supporting portion moves in a direction perpendicular to the first surface to clamp the paper to be folded with the folding portion; the folding portion rotates to control the folding of the paper to be folded.

[0031] Optionally, the pressure information acquisition module includes a pressure sensor and a slide rail;

[0032] The slide rail is arranged on the second surface, and the pressure sensor is arranged on a side of the slide rail away from the second surface and is slidably connected to the slide rail;

[0033] The pressure sensor moves in a direction perpendicular to the first surface to abut against the paper to be folded.

[0034] The technical solution provided by the embodiment of the present invention controls the folding of paper to obtain image information during the paper folding test and pressure information in the folded state; the difference between the paper before folding and the paper after folding and rebounding is obtained according to the image information analysis, so as to calculate the rebound angle of the paper; the paper stiffness is obtained through analysis and calculation according to the pressure information to reflect the deformation ability of the paper to restore the initial state after folding. The technical solution provided by the embodiment of the present invention can efficiently detect the folding performance of the paper, so that the paper that meets the folding performance requirements can be selected during packaging, thereby improving the folding effect and folding efficiency during paper packaging.

[0035] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A flowchart of a paper folding performance testing method provided according to an embodiment of the present invention;

[0038] Figure 2 A flowchart of another paper folding performance testing method provided according to an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of image information in a paper folding performance test process provided according to an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of image information in a process of another paper folding performance test provided according to an embodiment of the present invention;

[0041] Figure 5A schematic diagram of image information in another paper folding performance test process provided according to an embodiment of the present invention. ;

[0042] Figure 6 A flowchart of another paper folding performance testing method provided according to an embodiment of the present invention;

[0043] Figure 7 A flowchart of another paper folding performance testing method provided according to an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of the structure of a paper folding performance testing device provided by an embodiment of the present invention;

[0045] Fig. 9 A schematic diagram of an interface of a paper folding performance testing system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] Figure 1 This is a flow chart of a paper folding performance test method provided according to an embodiment of the present invention. This embodiment is applicable to the case of testing the folding performance of paper. The method can be executed by a paper folding performance test device. The paper folding performance test device can be implemented in the form of hardware and / or software and configured in a paper folding system test system. Figure 1 As shown, the method includes:

[0049] S110, controlling the paper to be in a folded state;

[0050] Specifically, the initial state of the paper to be tested may be a state where the paper has not undergone any deformation and the paper surface remains flat. The folded state may be a state where the paper is bent at a certain angle along a straight line on the paper surface. During the paper folding performance test, a portion of the paper may be clamped by a paper folding performance test device to remain stationary, and a portion of the paper may be controlled to be bent at a certain angle along a straight line to control the paper to be in a folded state. Exemplarily, the bending angle of the paper in the folded state may be 90°.

[0051] S120, obtaining pressure information of the paper in a folded state and image information of the paper during the folding process;

[0052] Specifically, the image information may be an image captured by a camera device before the paper is folded, when it is kept in a folded state, and after it is folded and rebounded. The image information may be acquired by taking real-time images of the paper on the side perpendicular to the paper surface during the folding test. The pressure information may reflect the resilience of the paper after it is folded. After the paper is folded, the paper itself has a deformation requirement to restore its original state, so that the paper will generate a force to restore the deformation. The pressure information may be acquired through a pressure sensor in a paper folding performance testing device. After the paper is kept in a folded state, the part of the paper folding performance testing device that clamps the paper may reduce the clamping force on the paper so that the resilience of the paper to restore its original state is released from the clamping part, thereby acquiring the pressure information of the paper in the folded state.

[0053] S130 , determining the rebound angle and stiffness of the paper according to the image information and the pressure information.

[0054] Specifically, the image information of the paper before folding and after folding and rebounding is preprocessed, and the difference between the initial state of the paper and the rebound state is obtained through comparative analysis, so as to calculate the rebound angle of the paper after folding to reflect the partial folding performance of the paper. The rebound force of the paper in the folded state can be obtained based on the obtained pressure information, and the stiffness of the paper can be calculated to reflect the partial folding performance of the paper. The larger the rebound angle and stiffness of the paper, the stronger the deformation ability of the paper to return to the initial state after folding.

[0055] The technical solution provided by the embodiment of the present invention controls the folding of paper to obtain image information during the paper folding test and pressure information in the folded state; the difference between the paper before folding and the paper after folding and rebounding is obtained according to the image information analysis, so as to calculate the rebound angle of the paper; the paper stiffness is obtained through analysis and calculation according to the pressure information to reflect the deformation ability of the paper to restore the initial state after folding. The technical solution provided by the embodiment of the present invention can efficiently detect the folding performance of the paper, so that the paper that meets the folding performance requirements can be selected during packaging, thereby improving the folding effect and folding efficiency during paper packaging.

[0056] Optionally, Figure 2 The present invention is a flowchart of another paper folding performance testing method provided in accordance with an embodiment of the present invention. Figure 3 A schematic diagram of image information in a paper folding performance test process provided according to an embodiment of the present invention. Figure 4 A schematic diagram of image information in a process of another paper folding performance test provided according to an embodiment of the present invention. Figure 5 FIG. 1 is a schematic diagram of image information in another paper folding performance test process according to an embodiment of the present invention. Figure 2 , Figure 3 , Figure 4 and Figure 5 The method comprises:

[0057] S210, controlling the paper to be in a folded state;

[0058] S220, obtaining first image information before the paper is folded and second image information after the paper rebounds.

[0059] Specifically, during the folding test, the paper will go through four states: initial, folded, pressure-holding, and rebound. The first image information may be an image captured in the initial state of the paper before folding, and the second image information may be an image captured in the state of the paper after folding, pressure-holding, and rebounding. For example, Figure 3 The first image information may be obtained by photographing the initial state of the paper before folding from the side perpendicular to the paper surface, wherein the paper portion a may be the clamping portion, the paper portion b is the bending portion, the paper portion a does not move during folding, and the paper portion b is folded around the straight line where the point O is located. Figure 4 It can be image information obtained by photographing the paper in a pressure-maintaining state after the paper is folded 90 degrees on the side perpendicular to the paper surface; Figure 5The second image information may be obtained by photographing the paper in a state after rebounding from the side perpendicular to the paper surface. The second image information may be photographed and obtained after a threshold period of time after the paper rebounds and maintains its shape unchanged, so as to avoid obtaining the second image information too early and affecting the calculation result of the rebound angle. Exemplarily, the time threshold for photographing the second image information may be 0.5 seconds.

[0060] S230 , determining a rebound angle of the paper according to the image information and the pressure information.

[0061] Optionally, Figure 6 FIG. 1 is a flow chart of another paper folding performance testing method provided according to an embodiment of the present invention. Figure 3 , Figure 5 and Figure 6 The method comprises:

[0062] S310, controlling the paper to be in a folded state;

[0063] S320, obtaining first image information before the paper is folded and second image information after the paper rebounds.

[0064] S330, extracting straight lines from the first image information and the second image information;

[0065] Specifically, after obtaining the first image information and the second image information, the first image information and the second image information can be preprocessed by an image vision algorithm, the first image information and the second image information can be filtered and denoised and converted into grayscale images, and then a straight line extraction algorithm can be used to extract straight lines. The straight line extraction algorithm can be a Hough probability extraction algorithm. For example, Figure 3 As shown, the first image information can be extracted into a flat line segment after straight line extraction. At this time, the paper is not folded, and when viewed from the side of the paper, the side lines of the paper are straight; Figure 5 As shown, the second image information is extracted through straight line extraction to obtain two line segments at an angle to each other. At this time, the paper has been folded, pressed and rebounded, but the folded part cannot be completely restored to its original state. When observed from the side of the paper, the side lines of the paper present a certain angle.

[0066] S340, determining the rebound angle of the paper according to the angle between the extracted straight lines.

[0067] Specifically, after folding and rebounding, the straight line where the paper part b is located forms a certain angle with the straight line where the paper part b is located in the initial state, and the angle is the rebound angle of the paper. Figure 5 As shown, the rebound angle α is 60°.

[0068] Optionally, Figure 7FIG. 1 is a flow chart of another paper folding performance testing method provided according to an embodiment of the present invention. Figure 4 and Figure 7 The method comprises:

[0069] S410, controlling the paper to be folded according to a preset folding speed;

[0070] Specifically, when folding part b of the paper, it can be folded at a preset folding speed to avoid damaging the paper due to a too fast folding speed, thereby affecting the test result of the folding performance, or affecting the test efficiency due to a too slow folding speed. For example, during the test, the preset folding speed can be 90° / s.

[0071] S420, obtaining a rebound pressure of the paper after the paper is kept in a folded state for a preset time;

[0072] Specifically, after the paper is bent to the folding angle, it needs to go through a pressure holding process. The paper clamping portion a is continuously clamped for a preset time. After the preset time is over, the clamping of the paper clamping portion a is released. At this time, the rebound force of the paper portion a is measured to obtain the rebound pressure of the paper. For example, the preset time of the paper pressure holding process can be set to 0.5 seconds.

[0073] S430, determining the stiffness of the paper according to the relationship between the rebound pressure and the length of the paper.

[0074] Specifically, different lengths of paper have different rebound pressures in the same folding test. If the folding performance of paper is judged only by rebound pressure, it is easy to cause significant test errors. By combining paper length information and rebound pressure to calculate paper stiffness, the folding performance of paper of different lengths can be better reflected.

[0075] Optionally, the stiffness of the paper can be calculated according to formula (1):

[0076]

[0077] Wherein, T is stiffness, F is rebound pressure, and L is paper length. For example, under the test conditions of a folding angle of 90°, a folding speed of 90° / s, a preset time of the pressure holding process of 0.5s, and a sampling frequency of the rebound pressure of 1000 Hz, if the paper length is 20 cm, the rebound pressure F is measured to be 1.89 N, the rebound angle is 12.356°, and the paper stiffness T is calculated by formula (1) to be 37.8 g*cm.

[0078] Figure 8 A schematic diagram of the structure of a paper folding performance testing device provided by an embodiment of the present invention. Figure 4 and Figure 8, the paper folding performance testing device includes: an L-shaped base 100, an image information acquisition module 200, a pressure information acquisition module 300 and a folding component 400;

[0079] The L-shaped base 100 includes a first surface A and a second surface B that are adjacently connected;

[0080] The image information acquisition module 200 is disposed on a side of the first surface A away from the second surface B, and is used to acquire image information during the paper folding process;

[0081] The pressure information acquisition module 300 is disposed on the second surface B of the L-shaped base 100 and abuts against the paper to be folded, and is used to acquire pressure information during the folding process of the paper;

[0082] The folding assembly 400 is disposed on the second surface of the L-shaped base 100 and is spaced apart from the pressure information acquisition module 300. The folding assembly 400 clamps the paper to be folded to control the folding of the paper.

[0083] Specifically, the first surface A of the L-shaped base 100 can be kept parallel to the horizontal plane, and the second surface B is perpendicular to the first surface A. The image information acquisition module 200 can be arranged on the side of the first surface A away from the second surface B and kept parallel to the second surface B, so as to maintain a certain distance from the second surface B to capture and acquire image information during the folding process. The folding component 400 can be arranged on the second surface B of the L-shaped base 100 and is arranged opposite to the image information acquisition module 200. The folding component 400 can clamp part of the position of the paper to be folded, and control the folding of the paper by rotating and bending part of the paper. The pressure information acquisition module 300 can be arranged on the second surface B of the L-shaped base 100 and keep a certain interval with the folding component 400. The part of the paper to be tested extending to the interval abuts against the pressure information acquisition module 300, so that the pressure information acquisition module 300 measures the pressure information after the pressure holding process. For example, Figure 3 As shown, point P is the part where the pressure information acquisition module 300 contacts the paper, and point O is the part where the folding assembly 400 clamps the folded paper.

[0084] Optionally, based on the above embodiment, continue to refer to Figure 8 The image information acquisition module 200 includes a camera 210 and a bracket 220;

[0085] The bracket 220 is disposed perpendicular to the first surface A, and the camera 210 is disposed on a side of the bracket 220 close to the second surface B. The camera 210 is used to capture image information during the paper folding process.

[0086] Specifically, the bracket 220 is used to fix the position of the camera 210. The camera 210 is arranged opposite to the folding assembly 400. The shooting surface of the camera 210 is at the same height as the horizontal surface of the folded paper to avoid errors in the image information caused by looking down or up at the shooting angle, which affects the test results.

[0087] Optionally, based on the above embodiment, continue to refer to Figure 8 The folding assembly 400 includes: a supporting portion 410 and a folding portion 420 arranged opposite to each other perpendicular to the first surface A; the supporting portion 410 moves in a direction perpendicular to the first surface A to clamp the paper to be folded with the folding portion 420; and the folding portion 420 rotates to control the folding of the paper to be folded.

[0088] Specifically, the support portion 410 may be an inverted L-shaped structure. The support portion 410 may move up and down in a direction perpendicular to the first surface A, so that the top of the support portion 410 may overlap with the folding portion 420 to clamp the paper to be folded. A hole is provided on the second surface B, and the folding portion 420 may be connected to the motor 430 through a coupling penetrating the hole. The rotation of the motor 430 drives part of the folding portion 420 to rotate, thereby controlling the folding of the paper.

[0089] Optionally, based on the above embodiment, continue to refer to Figure 4 and Figure 8 The pressure information acquisition module 300 includes a pressure sensor 310 and a slide rail 320; the slide rail 320 is disposed on the second surface B, the pressure sensor 310 is disposed on a side of the slide rail 320 away from the second surface B, and is slidably connected to the slide rail 320; the pressure sensor 310 moves in a direction perpendicular to the first surface A to abut against the paper to be folded.

[0090] Specifically, the back side of the slide rail 320 is attached to the second surface B, and the other end surface is parallel to the second surface B. In the direction perpendicular to the first surface A, the pressure sensor 310 can move up and down on the end surface of the slide rail 320, so that the pressure sensor 310 is in contact with the paper to be folded without applying pressure to the paper to be folded, so that the pressure sensor 310 can obtain the rebound pressure of the paper in the pressure-maintaining state. In addition, in the direction parallel to the first surface A, the pressure sensor 310 can move left and right on the slide rail 320 to adjust the position where the pressure sensor 310 is in contact with the paper to be folded, that is, Figure 4 The position of the midpoint P can be moved in the horizontal direction, so that the testing device can be adapted to test papers of various lengths.

[0091] An embodiment of the present invention further provides a paper folding performance testing system, which can control a paper folding performance testing device to perform testing using a paper folding performance testing method provided by any embodiment of the present invention. Fig. 9A schematic diagram of the interface of a paper folding performance test system provided in an embodiment of the present invention. Referring to 9, the paper folding performance test system can adjust and set the folding speed, folding angle and preset time of the pressure holding process, and monitor the angle and rebound force during the folding process in real time, and display the calculated paper stiffness and rebound angle. The paper stiffness calculation result can include the calculation results in two different units. A status indicator light is also provided on the interface, through which the status of the current paper folding performance test device can be viewed in real time. When the communication is normal, the whether-can-be-measured indicator light is displayed in green; when there is a communication abnormality, the whether-can-be-measured indicator light is displayed in red, and the device status needs to be checked at this time.

[0092] The paper folding performance testing system provided by the embodiment of the present invention has the same beneficial effects as the paper folding performance testing method provided by any of the above embodiments, which will not be described in detail here.

[0093] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A paper folding performance testing method, characterized in that: include: Control the paper to be in a folded state; Obtaining pressure information of the paper in a folded state and image information of the paper during the folding process; The rebound angle and stiffness of the paper are determined according to the image information and the pressure information.

2. The paper folding performance testing method according to claim 1, characterized in that: Obtain image information during the paper folding process, including: First image information before the paper is folded and second image information after the paper rebounds are acquired.

3. The paper folding performance testing method according to claim 2, characterized in that: Determining the rebound angle and stiffness of the paper according to the image information and the pressure information includes: performing straight line extraction on the first image information and the second image information; The rebound angle of the paper is determined according to the angle between the extracted straight lines.

4. The paper folding performance testing method according to claim 2, characterized in that: Control the paper in a folded state, including: Control the paper to be folded according to the preset folding speed; Get the pressure information of the paper in the folded state, including: Obtain the rebound pressure of the paper after keeping the paper in a folded state for a preset time.

5. The paper folding performance testing method according to claim 4, characterized in that: Determining the rebound angle and stiffness of the paper according to the image information and the pressure information includes: The stiffness of the paper is determined according to the relationship between the rebound pressure and the length of the paper.

6. The paper folding performance testing method according to claim 5, characterized in that: The stiffness is calculated according to the following formula: Among them, T is stiffness, F is rebound pressure, and L is paper length.

7. A paper folding performance testing device, characterized in that: The paper folding performance testing method according to any one of claims 1 to 6 is used for testing, wherein the paper folding performance testing device comprises: an L-shaped base, an image information acquisition module, a pressure information acquisition module and a folding component; The L-shaped base comprises a first surface and a second surface that are adjacently connected; The image information acquisition module is disposed on a side of the first surface away from the second surface, and is used to acquire image information during the paper folding process; The pressure information acquisition module is disposed on the second surface of the L-shaped base and abuts against the paper to be folded, and is used to acquire pressure information during the paper folding process; The folding assembly is disposed on the second surface of the L-shaped base and is spaced apart from the pressure information acquisition module. The folding assembly clamps the paper to be folded to control the folding of the paper.

8. The paper folding performance testing device according to claim 7, characterized in that: The image information acquisition module includes a camera and a bracket; The bracket is arranged perpendicular to the first surface, the camera is arranged on a side of the bracket close to the second surface, and the camera is used to capture image information during the paper folding process.

9. The paper folding performance testing device according to claim 7, characterized in that: The folding assembly comprises: a supporting portion and a folding portion arranged opposite to each other perpendicular to the first surface; The supporting portion moves in a direction perpendicular to the first surface to clamp the paper to be folded with the folding portion; the folding portion rotates to control the folding of the paper to be folded.

10. The paper folding performance testing device according to claim 7, characterized in that: The pressure information acquisition module includes a pressure sensor and a slide rail; The slide rail is arranged on the second surface, and the pressure sensor is arranged on a side of the slide rail away from the second surface and is slidably connected to the slide rail; The pressure sensor moves in a direction perpendicular to the first surface to abut against the paper to be folded.

Images