Method for evaluating permeability of paper ink
Through the methods of printing, sampling, curing and microscopic analysis of inkjet paper, the problem that the prior art cannot accurately evaluate the ink penetration performance of inkjet paper is solved, and the accurate evaluation and distinction of the ink absorption performance of digital paper is achieved.
Patent Information
- Application Number
- CN202411552226.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-02-18
AI Technical Summary
Existing paper ink absorption determination methods cannot accurately evaluate the differences in ink penetration performance of inkjet paper, resulting in the inability to accurately distinguish the performance of different inkjet papers.
By printing paper templates, sampling and embedding curing and sectioning, then pictures were taken and analyzed under an optical microscope to obtain the proportion of ink penetration to the coating layer, thereby evaluating the ink penetration performance of the paper.
This method can accurately evaluate the ink absorption performance of digital paper, distinguish the penetration performance of different papers, and is suitable for application scenarios of inkjet digital printing.
Smart Images
Figure CN119470192A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of paper detection, and in particular to a method for evaluating the ink penetration performance of paper. Background Art
[0002] Inkjet digital printing is a contactless, pressureless, plateless printing method. Information stored in a computer can be printed by inputting it into an inkjet printer. The resolution of inkjet printing is very high, and the printing quality is close to that of a photograph. Therefore, inkjet printing can produce color transparent or opaque pictures, as well as proofs of books, periodicals, newspapers, and color image proofs. If the inkjet printer is connected to a communication device, it can also transmit pictures and texts over long distances. As the format of inkjet printers becomes wider and wider, large-format printed materials produced by inkjet printers have been widely used in advertising posters in recent years. Therefore, the use of inkjet printing is becoming more and more extensive.
[0003] Due to the characteristics of inkjet printing, the paper has high requirements for ink absorption. The ink absorption of traditional paper uses the GB12911 paper and paperboard ink absorption method. This method mainly expresses the ink absorption performance by measuring the decrease in the surface reflection factor Ry of paper and paperboard after absorbing non-drying ink on a standard area within a specified time. When this method is actually used to evaluate the ink penetration performance of paper, it is found that due to the high ink absorption of inkjet paper, the difference between different inkjet papers is very small, and it is impossible to accurately evaluate the difference in ink penetration performance. Summary of the invention
[0004] The present application embodiment provides a method for evaluating the ink penetration performance of paper, the evaluation method comprising:
[0005] Print the paper template to be tested;
[0006] Sampling and processing a partial area of the paper template to form a sample to be photographed;
[0007] Place the sample to be photographed under an optical microscope for photography;
[0008] Analyze the captured images to obtain the ink penetration performance parameters of the paper.
[0009] In some embodiments, in the step of sampling and processing a partial area of the paper template, the area with the most ink stacking in the paper template is selected for sampling and processing.
[0010] In some embodiments, the step of sampling and processing a partial area of the paper template includes: embedding and curing the sample of the paper template; and slicing the cured sample to form a sample to be photographed.
[0011] In some embodiments, in the step of embedding and solidifying the paper template sample, the sample is embedded and solidified using transparent resin or paraffin.
[0012] In some embodiments, in the step of slicing the solidified sample to form a sample to be photographed, the slice thickness is 4-8 um.
[0013] In some embodiments, the step of analyzing the photographed image to obtain the ink penetration performance parameters of the paper includes: obtaining the ink penetration performance parameters of the paper according to the proportion of the ink penetrating into the coating layer.
[0014] In some embodiments, the step of obtaining the ink penetration performance parameter of the paper according to the proportion of ink penetration into the coating layer includes: respectively obtaining the coating layer area and the ink penetration area, and taking the ratio of the ink penetration area to the coating layer area as the ink penetration performance parameter.
[0015] In some embodiments, the step of obtaining the ink penetration performance parameters of the paper according to the proportion of ink penetration into the coating layer includes: respectively obtaining the number of pixels in the coating layer area and the ink penetration area, and the ratio of the number of pixels in the ink penetration area to the number of pixels in the coating layer area is the ink penetration performance parameter.
[0016] In some embodiments, the evaluation method further comprises: determining the ink penetration grade of the paper according to the obtained paper ink penetration performance parameters.
[0017] In some embodiments, the step of determining the ink penetration level of the paper based on the obtained paper ink penetration performance parameters includes: comparing the obtained paper ink penetration performance parameters with preset parameters, and determining the ink penetration level of the paper based on the preset parameter range within which the ink penetration performance parameters are located.
[0018] The method for evaluating the ink permeability of paper provided in the embodiment of the present application determines the penetration of ink in the coating by directly observing the cross section of the paper, and can accurately evaluate the ink absorption performance of the digital paper. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0020] Figure 1 It is a schematic flow chart of an embodiment of a method for evaluating ink penetration performance of paper of the present application;
[0021] Figure 2 is a schematic diagram of the process of sampling and processing paper in this embodiment;
[0022] Figure 3 This is a flow chart of an embodiment of a method for obtaining ink penetration performance parameters of the present application;
[0023] Figure 4a It is a structural schematic diagram of a sample piece of an embodiment of the present application photographed under a 500x optical microscope;
[0024] Figure 4b is a schematic structural diagram of another embodiment of a sample piece of the present application photographed under a 500x optical microscope;
[0025] Figure 4c It is a structural schematic diagram of another embodiment of the sample piece of the present application photographed under a 500x optical microscope;
[0026] Figure 5 It is a schematic flow chart of another embodiment of the method for evaluating the ink penetration performance of paper of the present application;
[0027] Figure 6 The present invention is a flow chart of an embodiment of determining the ink penetration level of paper. DETAILED DESCRIPTION
[0028] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.
[0029] The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any of their variations 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 limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.
[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0031] This application example provides a method for evaluating the ink penetration performance of paper. Figure 1 , Figure 1 This is a flow chart of an embodiment of a method for evaluating the ink permeability of paper in the present application. It should be noted that the method for evaluating the ink permeability of paper in the present application is mainly used to evaluate the ink permeability of inkjet digital paper. The evaluation method includes but is not limited to the following steps.
[0032] Step S100, printing a paper template to be tested.
[0033] In this step, several samples to be tested may be taken and printed using an inkjet printer, and the printing ink is required to be a special ink for the inkjet printer. Standard mode printing: the paper selection is inkjet paper, standard mode, color.
[0034] Please continue reading Figure 1 The evaluation method in this embodiment further includes step S200, sampling and processing a partial area of the paper template to form a sample to be photographed.
[0035] In step S200, specifically, the area with the most ink stacking in the paper template may be selected for sampling and processing, because the area with the most ink stacking can best reflect the ink penetration performance of the paper.
[0036] Optionally, see Figure 2 , Figure 2 2 is a schematic diagram of the process of sampling and processing paper in this embodiment, which includes step S210 of embedding and curing the sample of the paper template.
[0037] In this step, a paper sample suitable for the size of the embedding plate is cut (in this embodiment, it can be 1 cm*2 cm), and the sample is solidified using a suitable transparent resin or paraffin embedding solution (in this embodiment, it can be 812 resin kit or polar acrylic resin (such as Lowicryl K4M, etc.)).
[0038] Please continue reading Figure 2 The processing process also includes step S220, slicing the solidified sample to form a sample to be photographed.
[0039] In step S220, a suitable slicer (in this case, Leica RM2165 with a diamond knife) is used to cut a resin sheet with a thickness of 4-8um, and the sheet is placed on a glass slide that has been pre-dropped with clean water. The requirements for the preparation of the sheet are: the resin sheet is intact without distortion or deformation, and there are no bubbles on the sheet.
[0040] Optionally, see Figure 1 The evaluation method in this embodiment further includes step S300, placing the sample to be photographed under an optical microscope for photographing.
[0041] In this step, the preparation may be photographed using an optical microscope at a magnification of at least 500 times.
[0042] Please continue reading Figure 1 The evaluation method in this embodiment further includes step S400, analyzing the photographed image to obtain ink penetration performance parameters of the paper.
[0043] After the photo is taken, the photo can be analyzed using image processing software (such as PS software). Specifically, the ink penetration performance parameters of the paper can be obtained based on the percentage of ink penetration into the coating layer. Figure 3 , Figure 3 1 is a flow chart of an embodiment of a method for obtaining ink penetration performance parameters of the present application, the method comprising the following steps: Step S410, obtaining the coating layer area and the ink penetration area respectively.
[0044] Please also read Figures 4a to 4c ,in, Figure 4ais a schematic structural diagram of a sample piece of an embodiment of the present application photographed under a 500x optical microscope, Figure 4b is a schematic structural diagram of another embodiment of a sample piece of the present application photographed under a 500x optical microscope, Figure 4c This is a schematic diagram of the structure of another embodiment of a sample piece of the present application photographed under a 500x optical microscope, wherein 81 in the figure represents the resin material used for curing, 82 (i.e., the area between two dotted lines) represents the coating layer (area) of the paper, 83 represents the area where the ink penetrates into the coating layer, and 84 represents the base paper fiber layer of the paper.
[0045] Please continue reading Figure 3 The method further includes step S420, taking the ratio of the ink penetration area to the coating layer area as an ink penetration performance parameter.
[0046] In step S420, specifically, the ratio of the area of the region where the ink penetrates into the coating layer marked 83 to the area of the coating layer (region) marked 82 (i.e., the area between the two dotted lines) represented as paper can be used as the ink penetration performance parameter.
[0047] Optionally, in this embodiment, the number of pixels in the coating layer area and the ink penetration area can be obtained respectively, and the ratio of the number of pixels in the ink penetration area to the number of pixels in the coating layer area is the ink penetration performance parameter. Specifically, the magic wand tool in PS can be used to select the ink penetration area in the image and the non-penetrated area in the coating. Use the record measurement under the analysis menu, and the software automatically calculates the pixels in the image. The proportion of ink penetration in the coating can be calculated by counting the number of color pixels. Please continue to refer to Figures 4a to 4c , wherein the proportion of pixel points in the three embodiments is as shown in the following table.
[0048] Serial number Figure 4a Figure 4b Figure 4c Pixels of the penetration area 1052 1401 1471 Total pixels of coating 5291 5553 4899 Proportion 19.9％ 25.2％ 30.0％
[0049] From the above table, we can see that Figure 4a The penetration ratio in the embodiment is 19.9%; Figure 4b The penetration ratio in the embodiment is 25.2%; Figure 4c The penetration ratio in the embodiment is 30.0%. Ink penetration performance is one of the indicators that affect the printing effect. The requirements in different application scenarios are different, so papers with different penetration ratios can be used in different scenarios.
[0050] The method for evaluating the ink permeability of paper in the embodiment of the present application uses a digital printer to print on inkjet paper under the same parameter conditions, and after curing and slicing the paper samples under the same color block, the penetration of the ink in the coating is determined by directly observing the cross-section of the paper. This method can be used to evaluate the ink absorption performance of digital paper, and has the characteristics of simple process and accurate evaluation.
[0051] See also Figure 5 , Figure 5 1 is a flow chart of another embodiment of the method for evaluating the ink permeability of paper of the present application. The evaluation method in this embodiment includes but is not limited to the following steps.
[0052] Step S100, printing a paper template to be tested.
[0053] Step S200, sampling and processing a partial area of the paper template to form a sample to be photographed.
[0054] Step S300, placing the sample to be photographed under an optical microscope for photographing.
[0055] Step S400: analyzing the photographed image to obtain ink penetration performance parameters of the paper.
[0056] Among them, for the detailed features of steps S100 to S400, please refer to the relevant description of the aforementioned embodiment. The evaluation method in this embodiment is different from the aforementioned embodiment in that the evaluation method in this embodiment also includes step S500, which determines the ink penetration level of the paper based on the obtained paper ink penetration performance parameters.
[0057] Optionally, please also refer to Figure 6 , Figure 6 The present invention is a flow chart of an embodiment of determining the ink penetration level of paper, which includes step S510, comparing the obtained paper ink penetration performance parameters with preset parameters; and step S520, determining the ink penetration level of the paper according to the preset parameter interval range of the ink penetration performance parameters.
[0058] The above is an embodiment of the Figures 4a to 4c For example, among which, Figure 4a The penetration ratio in the embodiment is 19.9%. If 0-20% is taken as the first level, then Figure 4a The permeability level of the paper in the embodiment is the first level; Figure 4b The penetration ratio in the embodiment is 25.2%; if 21-30% is taken as the second level, then Figure 4b The penetration level of the paper in the embodiment is the second level; similarly, Figure 4cThe penetration ratio in the embodiment is 30.0%, which is also the second level. In addition, 31-40% can be set as the third level, etc., which will not be listed and described in detail here.
[0059] The evaluation method in this embodiment can not only accurately evaluate the ink absorption performance of digital paper, but also classify the ink absorption performance of different papers, so that papers with different permeability ratios can be used in different scenarios.
[0060] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A method for evaluating the ink penetration performance of paper, characterized in that: The evaluation methods include: Print the paper template to be tested; Sampling and processing a partial area of the paper template to form a sample to be photographed; Place the sample to be photographed under an optical microscope for photography; Analyze the captured images to obtain the ink penetration performance parameters of the paper.
2. The evaluation method according to claim 1, characterized in that: In the step of sampling and processing a partial area of the paper template, the area with the most ink stacking in the paper template is selected for sampling and processing.
3. The evaluation method according to claim 2, characterized in that: The step of sampling and processing a partial area of the paper template includes: embedding and curing the sample of the paper template; and slicing the cured sample to form a sample to be photographed.
4. The evaluation method according to claim 3, characterized in that: In the step of embedding and solidifying the paper template sample, the sample is embedded and solidified using transparent resin or paraffin.
5. The evaluation method according to claim 4, characterized in that: In the step of slicing the solidified sample to form a sample to be photographed, the slice thickness is 4-8 um.
6. The evaluation method according to claim 1, characterized in that: The step of analyzing the photographed image to obtain the ink penetration performance parameters of the paper includes: obtaining the ink penetration performance parameters of the paper according to the proportion of the ink penetrating into the coating layer.
7. The evaluation method according to claim 6, characterized in that: The step of obtaining the ink penetration performance parameter of the paper according to the proportion of ink penetration into the coating layer includes: respectively obtaining the coating layer area and the ink penetration area, and taking the ratio of the ink penetration area to the coating layer area as the ink penetration performance parameter.
8. The evaluation method according to claim 7, characterized in that: The step of obtaining the ink penetration performance parameter of the paper according to the proportion of ink penetration into the coating layer includes: obtaining the number of pixels in the coating layer area and the ink penetration area respectively, and the ratio of the number of pixels in the ink penetration area to the number of pixels in the coating layer area is the ink penetration performance parameter.
9. The evaluation method according to claim 1, characterized in that: The evaluation method further comprises: judging the ink penetration grade of the paper according to the obtained paper ink penetration performance parameters.
10. The evaluation method according to claim 9, characterized in that: The step of determining the ink penetration grade of the paper according to the obtained paper ink penetration performance parameters comprises: comparing the obtained paper ink penetration performance parameters with preset parameters, and determining the ink penetration grade of the paper according to the preset parameter interval range of the ink penetration performance parameters.