Method and device for measuring printing process effect of hologram paper and printed matter of hologram paper

Abstract

The invention discloses a printing process effect measuring method and device for hologram paper and printed matter thereof, and the device comprises a detection box, the top of the detection box is provided with a standard light source, and the bottom of the detection box is provided with a detection table; the bending mechanism is located in the detection box, and the bending mechanism is located on one side of the detection table and used for bending and recovering the flattened hologram paper and printed matter of the hologram paper; the detection mechanism is located in the detection box, can move along the direction parallel to or perpendicular to the detection table, and is used for collecting color values of the hologram paper and the hologram paper printed matter, and collecting an image of the hologram paper printed matter and an image of the standard sample for comparison; the sample covering mechanism is located on one side of the detection box and comprises an adjusting device and a sample covering piece arranged on the adjusting device, and the sample covering piece is parallel to the end face of the detection table. The method and the device can be used for measuring the color value of the laser paper and evaluating the finishing process effect of the laser printed matter at the same time.

Description

Technical Field

[0001] The present invention relates to the field of laser paper measurement technology, and in particular to a method and device for measuring the printing process effect of laser paper and printed matter thereof. Background Art

[0002] In the printing and packaging industry, holographic laser paper has become a common packaging material for high-end color boxes due to its vibrant holographic effects under illumination. Column laser paper, in particular, is widely used. Microscopically, the surface of column laser paper features a grating structure periodically arranged according to angular orientation. Macroscopically, it exhibits a periodic visual effect of alternating bright and dark columns. The grating angles parallel to the columns are constant, while those perpendicular to them vary with a certain angular difference. The surface of this grating laser paper diffracts reflected light, creating a rainbow phenomenon where different monochromatic lights are coherently intensified in different diffraction directions. This creates significant differences in color characteristics at different locations. When observing the surface of this holographic laser paper, whether at different locations at the same viewing angle or at the same location at different viewing angles, the visual perception of color varies.

[0003] However, existing technologies, whether visual inspection or various color detection instruments suitable for measuring uniform color, are unable to accurately characterize this type of color, making it difficult to control the stability of the production quality of laser paper. Therefore, the colorimetric characterization and detection of this type of product is particularly important.

[0004] In addition, in the current printing process of laser paper printed products, in order to confirm the effect of the laser paper surface finishing process (i.e. lamination, UV and other printing processes based on laser paper), actual finishing process proofing is required. The process is relatively cumbersome and takes a certain amount of time and cost.

[0005] Therefore existing technology still needs to be improved and improved. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method and device for measuring the printing process effect of laser paper and its printed products, aiming to solve the problem of inconvenience in measuring the printing process effect of laser paper and its printed products in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A method for measuring the printing process effect of laser paper comprises: bending the laser paper in a direction perpendicular to the bright light column under a standard light source, determining the position of the dark light column based on the diffraction pattern formed on the surface of the laser paper; and measuring the color value of the dark light column position through a filter cover sheet.

[0008] A method for measuring the printing process effect of laser paper printed products comprises: under a standard light source, bending the laser paper in a direction perpendicular to the bright light column, and determining the position of the dark light column according to the diffraction pattern formed on the surface of the laser paper; measuring the color value of the dark light column position through a simulated cover sheet; visually comparing and evaluating the surface image of the laser paper attached to the simulated cover sheet with the image of a standard sample; collecting the surface image of the laser paper attached to the simulated cover sheet, and performing a similarity comparison evaluation between the image and the image of the standard sample; measuring the color value of the dark light column of the standard sample, and performing a color difference comparison between the color value of the standard sample and the color value of the dark light column position measured through the simulated cover sheet; if the color difference comparison evaluation, visual comparison evaluation and similarity comparison evaluation are all qualified, then the printing process effect of the laser paper printed product is qualified; wherein the standard sample is a laser paper printed product that meets the required standards.

[0009] A device for measuring the printing process effect of laser paper and its printed matter, comprising: a detection box, a standard light source is provided on the top of the detection box, and a detection platform is provided on the bottom of the detection box; a bending mechanism, the bending mechanism is located in the detection box, the bending mechanism is located on one side of the detection platform, and is used to bend and restore the flatness of the laser paper and its printed matter; a detection mechanism, the detection mechanism is located in the detection box and can move parallel or perpendicular to the detection platform, and is used to collect color values ​​of the laser paper and laser paper prints, and collect images of the laser paper prints and images of standard samples for comparison; a covering mechanism, the covering mechanism is located on one side of the detection box, the covering mechanism includes an adjustment device and a covering sheet provided on the adjustment device, the covering sheet is parallel to the end face of the detection platform, and the adjustment device is used to adjust and drive the covering sheet to adhere to or away from the surface of the laser paper.

[0010] The bending mechanism includes: a sample pressing assembly and a sample positioning and pushing assembly, the sample pressing assembly is located above the positioning and pushing assembly; the sample pressing assembly includes a telescopic rod and a sample pressing plate, one end of the telescopic rod is connected to the side wall of the detection box, and the sample pressing plate is arranged at the other end of the telescopic rod; the positioning and pushing assembly includes a sample pushing negative pressure tube and a sample pushing lifting part, the sample pushing negative pressure tube is located on one side of the detection platform, and the sample pushing lifting part is arranged below the sample pushing negative pressure tube to drive the sample pushing negative pressure tube to be flush with or higher than the detection platform.

[0011] The pressure sample plate is an arc-shaped plate, the concave surface of the arc-shaped plate faces one side of the top sample negative pressure tube, and the curvature of the arc-shaped plate is adapted to the curvature of the top sample negative pressure tube.

[0012] The top sample negative pressure tube is provided with a plurality of negative pressure suction holes for positioning the laser paper and its printed matter.

[0013] The adjustment device includes: a rotation adjustment device and a longitudinal adjustment device for adjusting the height of the rotation adjustment device; the rotation adjustment device includes a rotating shaft frame, and a plurality of the cover sample sheets are relatively independently arranged on the rotating shaft frame through the cover sample rotating shaft, and the cover sample rotating shaft is also provided with an identification handle corresponding to the cover sample sheet for adjusting the position of the cover sample sheet; the cover sample sheet includes a filter cover sample sheet and a simulation cover sample sheet, and the detection box is provided with a cover sample hole for installing the cover sample sheet, so that the cover sample sheet can be attached to the laser paper.

[0014] The longitudinal adjustment device includes: a driving member, an active threaded shaft, a linkage gear and a rack, the rotation adjustment device is connected to the rack, the output end of the driving member is connected to the active threaded shaft, and the outer periphery of the linkage gear is engaged with the gear teeth of the active threaded shaft and the rack; when the driving member drives the active threaded shaft to rotate, the active threaded shaft drives the rotation adjustment device to move longitudinally through the linkage gear and the rack, so as to adjust the cover sheet to a preset height.

[0015] The detection mechanism includes: a mounting frame, on which a colorimeter and an optical projection locator located on one side of the colorimeter are provided, the optical projection locator is used to project an enlarged cross positioning mark on the laser paper to facilitate the colorimeter to locate the position of the dark light column to be measured; a longitudinal movement component, which is arranged above the mounting frame to adjust the height difference between the mounting frame and the detection platform; a transverse movement component, which is arranged on the detection box and located above the longitudinal movement component to adjust the position of the mounting frame on the horizontal plane above the detection platform; the transverse movement component is also provided with a camera unit.

[0016] The testing platform includes a front sample placement platform and a rear sample placement platform. The front sample placement platform and the rear sample placement platform are arranged at the same height, and an installation space for accommodating the positioning sample top assembly is provided between the two. A front stop gauge is provided on the front sample placement platform for aligning with the front edge of the sample to be tested when placing the sample. A front edge scale line is also provided on the front sample placement platform for calibrating the sample placement detection position.

[0017] Compared with the prior art, the present invention provides a method and device for measuring the printing process effect of laser paper and its printed products, wherein the printing process effect measuring device of laser paper and its printed products includes: a detection box, a standard light source is provided on the top of the detection box, and a detection platform is provided at the bottom of the detection box; a bending mechanism, the bending mechanism is located in the detection box, and the bending mechanism is located on one side of the detection platform, for bending and flattening the laser paper and its printed products; a detection mechanism, the detection mechanism is located in the detection box and can move parallel or perpendicular to the detection platform, for collecting the color values ​​of the laser paper and the laser paper prints, and collecting the images of the laser paper prints and the images of the standard samples for comparison; a covering mechanism, the covering mechanism is located on one side of the detection box, the covering mechanism includes an adjustment device and a covering sheet provided on the adjustment device, the covering sheet is parallel to the end face of the detection platform, and the adjustment device is used to adjust and drive the covering sheet to fit or move away from the surface of the laser paper. The printing process effect measurement device for laser paper and its printed products of the present application can not only accurately and efficiently complete the color value detection of the light column laser paper, but also can simultaneously and quickly evaluate the finishing process effect of the laser paper printed products, and efficiently complete the simulation proofing of the surface finishing process effect of the laser paper; realize the integrated application of full-process visual effect detection from the raw materials of the packaging printing materials to the surface finishing process in the color box packaging production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a device for measuring the printing process effect of laser paper and printed matter provided by the present invention.

[0019] Figure 2 This is a structural schematic diagram of the positioning top sample component in the printing process effect measurement device for laser paper and printed products provided by the present invention.

[0020] Figure 3 This is a structural schematic diagram of the slider, longitudinal movement component, optical projection positioner, camera unit and mounting frame in the device for measuring the printing process effect of laser paper and printed matter provided by the present invention.

[0021] Figure 4 This is a schematic diagram of the principle structure of the optical projection locator in the printing process effect measurement device for laser paper and printed matter provided by the present invention.

[0022] Figure 5 This is a schematic structural diagram of the adjustment device in the printing process effect measurement device for laser paper and printed matter provided by the present invention.

[0023] Figure 6 This is a schematic structural diagram of the longitudinal adjustment device in the printing process effect measurement device for laser paper and printed matter provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the effect of the filter cover sheet in the printing process effect measurement device for laser paper and printed products provided by the present invention.

[0025] Figure 8 This is a schematic diagram of the effect of a simulated cover sheet with a matte film surface in the device for measuring the printing process effect of laser paper and printed products provided by the present invention.

[0026] Figure 9 This is a schematic diagram of the effect of a simulated cover sheet using a reverse process effect coating in the printing process effect measurement device for laser paper and printed matter provided by the present invention.

[0027] Figure 10 A schematic diagram of the effect of a simulated covering sample sheet with an ice point snowflake process effect coating is provided in the device for measuring the printing process effect of laser paper and printed products provided by the present invention.

[0028] Figure 11 This is a schematic diagram of the effect of a simulated cover sheet with a dermatoglyphic effect coating used in the printing process effect measurement device for laser paper and printed products provided by the present invention.

[0029] Figure 12 This is a schematic diagram of the diffraction pattern of the rainbow light column laser paper provided by the present invention when it is mechanically bent in a direction perpendicular to the bright light column.

[0030] Figure 13 Schematic diagram of the diffraction pattern of the platinum light column laser paper provided by the present invention when mechanically bent in a direction perpendicular to the bright light column.

[0031] Figure Numbers Detection box 1, horizontal slide 10, detection table 11, front sample platform 111, rear sample platform 112, front stop 113, front edge scale line 114, sample covering hole 12, sample covering scale line 13, bending mechanism 2, sample pressing assembly 21, telescopic rod 211, curved plate 212, positioning sample top assembly 22, sample top negative pressure pipe 213, negative pressure suction hole 2131, sample top lifting part 214, top frame 2141, lifting arm 2142, bottom frame 2143, sample top motor 2144, detection mechanism 3, mounting frame 31, colorimeter 32, optical projection positioner 33, Projection light source 331, cross PVC sheet 332, double convex lens 333, longitudinal movement component 34, transverse movement component 35, slide bar 351, slider 352, camera unit 36, sample covering mechanism 4, adjustment device 41, sample covering sheet 42, sample sheet body 421, sample sheet frame 422, rotation adjustment device 43, shaft frame 431, sample covering shaft 432, marking handle 433, longitudinal adjustment device 44, driving part 441, active threaded shaft 442, linkage gear 443, rack 444, rocker 445, rocker arm 446, gear box 447, load-bearing column 45. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be noted that when a component is referred to as being “mounted on,” “fixed on,” or “disposed on” another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being “connected to” another component, it may be directly connected to the other component or there may be an intermediate component.

[0034] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are merely relative concepts or are based on the normal use status of the product and should not be considered as restrictive.

[0035] Currently, many research institutions at home and abroad have analyzed the color rendering mechanism of holographic laser paper gratings and proposed a variety of colorimetric and spectral detection methods. Among them, the technical research and development of light column laser paper color measurement has been conducted from three directions: 1. Building a diffuse reflection measurement device for color measurement, but the construction cost of the diffuse reflection light illumination system is high and the measurement error is large; 2. Setting a linear light source perpendicular to the bright light column to locate the dark light column for color measurement, but the positioning accuracy and measurement aperture have a significant impact on the measurement accuracy, and this method cannot simultaneously perform effective human eye visual evaluation (in actual applications, quantitative evaluation and visual evaluation are usually combined); 3. Based on the periodic arrangement of the grating angle of the light column laser paper, measurement is achieved through fixed-point rotation measurement or vertical light column movement measurement. Because it requires sampling covering at least one complete grating angle period to complete color characterization, the overall efficiency is relatively low and cannot meet the needs of actual production applications.

[0036] In addition, in the current printing process of laser paper printed products, in order to confirm the effect of the laser paper surface finishing process (i.e. lamination, UV and other printing processes based on laser paper), actual finishing process proofing is required. The process is relatively cumbersome and takes a certain amount of time and cost.

[0037] Based on the problem of inconvenience in measuring the printing process effect of laser paper and its printed products in the prior art, this application provides a printing process effect measurement device for laser paper and its printed products. Figures 1-13, comprising: a testing box 1, a standard light source is provided on the top of the testing box 1, and a testing table 11 is provided at the bottom of the testing box 1; a bending mechanism 2, the bending mechanism 2 is located in the testing box 1, and the bending mechanism 2 is located on one side of the testing table 11, for bending and restoring the flatness of the laser paper and its printed products; a testing mechanism 3, the testing mechanism 3 is located in the testing box 1, and can move parallel to or perpendicular to the testing table 11, for collecting the color values ​​of the laser paper and the laser paper prints, and collecting the images of the laser paper prints and the images of the standard samples for comparison; a covering mechanism 4, the covering mechanism 4 is located on one side of the testing box 1, the covering mechanism 4 comprises an adjusting device 41 and a covering sheet 42 provided on the adjusting device 41, the covering sheet 42 is parallel to the end face of the testing table 11, and the adjusting device 41 is used to adjust and drive the covering sheet 42 to fit or move away from the surface of the laser paper. The printing process effect measurement device for laser paper and its printed products of the present application can not only accurately and efficiently complete the color value detection of the light column laser paper, but also can simultaneously and quickly evaluate the finishing process effect of the laser paper printed products, and efficiently complete the simulation proofing of the surface finishing process effect of the laser paper; realize the integrated application of full-process visual effect detection from the raw materials of the packaging printing materials to the surface finishing process in the color box packaging production process.

[0038] In this application, the top of the inner wall of the detection box 1 is provided with standard light sources such as D65, D50, and D75 commonly used in the printing industry, which can provide uniform and stable lighting conditions to avoid the impact of external light changes on the measurement of the printing process effect of laser paper and its printed products, and ensure the accuracy and comparability of the measurement results; at the same time, the standard light source can be switched according to actual needs, and the specific installation and control switching method of the standard light source belongs to the existing technology. A display control panel is provided on the front face of the detection box 1 for device control and data display. The left and right side walls of the detection box 1 are provided with front and back horizontal slides 10 for the detection mechanism 3 to move back and forth along the direction parallel to the plane of the detection table 11; the inner wall of the detection box 1 is provided with a neutral gray coating, specifically Munsell N7 or GB / T 250 gray sample card level 1-2, to avoid the influence of ambient light on visual evaluation; under the marked light source, the detection box 1 shows uniform diffuse reflected light.

[0039] Furthermore, the bending mechanism 2 includes: a sample pressing component 21 and a positioning sample pushing component 22, the sample pressing component 21 is located above the positioning sample pushing component 22; the sample pressing component 21 includes a telescopic rod 211 and a sample pressing plate, one end of the telescopic rod 211 is connected to the side wall of the detection box 1, and the sample pressing plate is arranged at the other end of the telescopic rod 211; the positioning sample pushing component 22 includes a sample pushing negative pressure tube 213 and a sample pushing lifting part 214, the sample pushing negative pressure tube 213 is located on one side of the detection platform 11, and the sample pushing lifting part 214 is arranged below the sample pushing negative pressure tube 213 to drive the sample pushing negative pressure tube 213 to be flush with or higher than the detection platform 11; the sample pressing plate is an arc-shaped plate 212, which realizes uniform bending and precise positioning of laser paper and its printed products, and avoids the formation of creases on the laser paper and its printed products during bending, which affects the measurement effect. The concave of the arc-shaped plate 212 The surface faces the side of the top sample negative pressure tube 213, and the curvature of the curved plate 212 is adapted to the curvature of the top sample negative pressure tube 213, so that the curved plate 212 and the top sample negative pressure tube 213 can form a contact surface with extremely high fit when bending the laser paper and its printed products. This adaptability can avoid the situation where local force is too large or too small, and avoid damage, creases or coating shedding on the surface of the laser paper and its printed products due to uneven force, thereby protecting the integrity of the sample; at the same time, the top sample negative pressure tube 213 can fix the laser paper and its printed products through negative pressure adsorption, and cooperate with the curved plate 212 with the concave surface facing, the two can form a wrapping constraint on the laser paper and its printed products during the bending process, reducing the sliding or deviation of the sample during bending; in addition, the adapted curvature setting can make the bending force evenly transmitted along the sample contact surface, ensuring the accuracy of the bending position, providing an accurate spatial reference for the subsequent detection agency to collect data in a specific area, thereby improving the overall measurement accuracy. The arc of the arc plate 212 is a minor arc, so as to avoid the arc of the arc plate 212 being too large and causing bending and forming indentations on the surface of the laser paper and its printed matter.

[0040] In this application, two sample pressing assemblies 21 are provided, positioned relative to each other on the left and right side walls of the inspection box 1. These two sample pressing assemblies 21 are positioned near the bottom of the inspection box 1 to reduce the height of the sample positioning assembly 22 during bending of the laser paper and its printed matter. This prevents significant displacement of the laser paper and its printed matter after the positioning assembly 22 is reset, which could affect the positioning of the dark light column. A curved plate 212 is attached to the side wall of the inspection box 1 via a multi-stage telescopic rod 211, allowing the sample pressing assembly 21 to determine a more suitable bending area for laser paper and its printed matter of varying sizes, facilitating placement of the laser paper and its printed matter on the inspection table 11. Furthermore, the telescopic rod 211 is simple in structure and minimizes obstruction to visual observation. The sample pressing assembly 21 is located directly above the top sample negative pressure tube 213, with the concave surface of the curved plate 212 facing the side of the top sample negative pressure tube 213. The two curved plates 212 cooperate with the top sample negative pressure tube 213 to better bend the laser paper and its printed materials, ensuring consistency and stability during the bending process, and facilitating better determination of the position of the dark light column; the top sample lifting portion 214 can adjust the top sample negative pressure tube 213 to be higher than the detection table 11 or flush with the detection table 11, facilitating stable support of the sample during bending and calibration of the position when returning to a flat state, avoiding errors caused by sample displacement or uneven force during bending, and ensuring the reliability of the bending effect. In addition, the sample pressing assembly 21 and the positioning top sample assembly 22 are close to the detection chamber opening of the detection box 1, which is conducive to the user to better observe the position of the dark light column.

[0041] In the embodiment of the present application, the top sample lifting part 214 includes a top frame 2141, a lifting arm 2142, and a bottom frame 2143 from top to bottom, and a top sample motor 2144 is provided on the side of the bottom frame 2143; wherein, the lifting arm 2142 adopts a scissor-type lifting arm 2142, and the motor adopts a screw motor, and the top sample negative pressure tube 213 is fixed above the top frame 2141, and the top frame 2141 and the bottom frame 2143 are arranged in parallel, and the upper end of the lifting arm 2142 is fixedly connected to the lower end of the top frame 2141, and the bottom frame 2143 is a rectangular frame structure, and a connecting rod is provided in the hollow part of the bottom frame 2143 along the direction parallel to the short side of the bottom frame 2143, and the right side of the lower end of the lifting arm 2142 is connected to the connecting rod The base frame 2143 is hinged, and a slide is provided on the side wall of the hollow part along the long side direction of the base frame 2143. The lower left side of the lifting arm 2142 is slidably set in the slide, and the output end of the top motor 2144 is connected to the lower left side of the lifting arm 2142 to drive the lower left side of the lifting arm 2142 to move along the slide toward or away from the lower right side of the lifting arm 2142, and then the top frame 2141 is raised or lowered by the lifting arm 2142; of course, the lifting arm 2142 can also adopt a hydraulic lifting arm 2142, and the working principle and structure of the scissors-type lifting arm 2142 driven by the motor to rise and fall and the hydraulic lifting arm 2142 belong to the existing technology, and this application will not be elaborated here.

[0042] Furthermore, a plurality of negative pressure suction holes 2131 are provided on the top sample negative pressure tube 213 for positioning the laser paper and its printed matter.

[0043] In this application, the negative pressure suction holes 2131 are evenly spaced and open upward on the top sample negative pressure tube 213. The external pressure device is connected to the top sample negative pressure tube 213 to provide negative pressure to adsorb and position the laser paper and its printed materials. The negative pressure suction holes 2131 fix the laser paper and its printed materials through adsorption force to prevent position deviation caused by sample displacement or sliding during the bending process, ensure the stable clamping and uniform force of the bending mechanism 2 on the sample, and avoid affecting the accuracy of observing the dark light column position effect.

[0044] Furthermore, the adjustment device 41 includes: a rotation adjustment device 43 and a longitudinal adjustment device 44 for adjusting the height of the rotation adjustment device 43; the rotation adjustment device 43 and the longitudinal adjustment device 44 are arranged at the rear of the detection box 1 through a load-bearing column 45; the rotation adjustment device 43 includes a rotating shaft frame 431, and several of the cover samples 42 are relatively independently arranged on the rotating shaft frame 431 through a cover sample rotating shaft 432, and the cover sample rotating shaft 432 is also provided with an identification handle 433 corresponding to the cover sample 42 for adjusting the position of the cover sample 42; the cover sample 42 includes a filter cover sample and a simulation cover sample, and the detection box 1 is provided with a cover sample hole 12 for installing the cover sample 42, so that the cover sample 42 can be attached to the laser paper.

[0045] In the present application, in order to measure the printing process of laser paper and the printing effects of laser paper prints under different printing processes, it is necessary to set up multiple cover sheets 42 to meet different measurement needs; on this basis, different cover sheets 42 need to be moved above the laser paper to simulate different printing process effects during the measurement process; the longitudinal adjustment device 44 drives the longitudinal movement of several cover sheets 42 on the rotary adjustment device 43, so that the required cover sheet 42 can be moved to the height of the cover hole 12, and the rotary adjustment device 43 drives the required cover sheet 42 to rotate into the cover hole 12. At this time, the cooperation of the longitudinal adjustment device 44 and the rotary adjustment device 43 can realize the switching of cover sheets 42 simulating different printing process effects, meet the diverse detection needs, improve the flexibility and applicability of the device, and avoid the problem of long cycle and high cost caused by the actual proofing to determine the effect when signing the traditional laser paper prints. In the present application, the covering hole 12 is located on the rear wall and the left wall of the detection box 1, and the covering hole 12 is close to the plane of the detection table 11 in the upper and lower directions. A covering score line 13 at the same horizontal height as the covering hole 12 is provided on the outer side of the right wall of the detection box 1, which is convenient for adjusting the required covering piece 42 to be aligned with the height of the covering hole 12.

[0046] In the embodiment of the present application, a plurality of cover sheets 42 are arranged at equal intervals and in parallel on the rotating shaft frame 431 through a plurality of cover sample rotating shafts 432, which facilitates the user to control the height of the cover sheet 42 moving in the longitudinal direction, facilitates the cover sheet 42 to smoothly enter the cover sample well 12, and avoids mutual influence between different cover sheets 42; an identification handle 433 is also provided on the cover sample rotating shaft 432, and a digital serial number is set on the identification handle 433 for the user to identify the corresponding cover sheet 42 under the printing process. On this basis, the user can toggle the identification handle 433 according to needs to drive the cover sheet 42 to rotate into the cover sample well 12 or rotate the cover sheet 42 out of the cover sample well 12; In this application, the cover sheet 42 is divided into a filtering cover sheet and a simulation cover sheet, wherein the filtering cover sheet is an optical semi-transparent filter, that is, a neutral density filter that can balance transmittance and diffraction suppression, specifically refers to a matte PET (polyethylene terephthalate) sheet or a frosted calendered PVC (polyvinyl chloride) sheet with a transmittance of 30%-70%, and a thickness of usually 0.1-0.5mm to avoid optical path deviation; when filtering, a matte PET sheet with a transmittance of 50%, a thickness of 0.3 and a frosted coating on the upper surface is preferably used. After the filtering cover sheet is covered on the surface of the laser paper, the transmitted light passing through the filter on the surface of the laser paper is diffusely scattered, effectively masking the diffracted light, and when the refractive index of the filtering cover sheet (n≈1.5) is selected to be close to that of the laser paper coating (n≈1.6), the interface Fresnel reflection can be reduced, stray light can be reduced, and it is conducive to better observation of the color value of the laser paper itself.

[0047] The sample frame 422 of the sample cover sheet 42 in this application is a rectangular, rigid, lightweight, thin frame. The side length of the sample frame 422 is no longer than the side length of the test box 1, and the diagonal length of the sample frame 422 is no longer than the length of the sample hole 12 on the rear wall of the test box 1. The sample body 421 of the sample cover sheet 42 is a lightweight, transparent sheet material fixed to the bottom surface of the sample frame 422. It is used for filtering and simulating the effects of laser paper surface finishing processes (i.e., lamination and UV treatment on the laser paper surface). Among them, preferably, the sample body 421 simulating the lamination process is a commonly used transparent film such as PE (polyethylene) film, PP (polypropylene) film, PET (polyethylene terephthalate) film and BOPP film (biaxially oriented polypropylene film), and its thickness range is preferably 0.03-0.05mm, and according to the film surface properties of the sample body 421, it includes but is not limited to glossy film, matte film, tactile film, etc. Preferably, the sample body 421 simulating the UV process is a PVC (polyvinyl chloride) transparent film, PE, PP and other transparent films. The thickness of the PVC transparent film is preferably 0.1-1mm, and the thickness of the PE and PP transparent films is preferably 0.03-0.05mm. The upper surface of the sample body 421 simulating the UV process is pre-coated with a corresponding UV coating by adopting the actual UV process (such as screen printing, flexographic printing, gravure printing and offset printing, etc., printing UV oil and UV light curing, among which PVC transparent film is preferably flat screen printing, flat gravure printing, etc., PE and PP transparent films are preferably roll-to-roll screen printing, roll-to-roll flexographic printing, roll-to-roll gravure printing and roll-to-roll offset printing). The UV coating includes but is not limited to coatings with process effects such as freezing point snowflakes, reverse, and leather grain. In addition, in order to make the UV process effect on the cover sample 42 close to the UV process effect on the actual laser paper, it is necessary to adjust the amount of UV oil applied on transparent films such as PVC transparent film, PE and PP according to different process effects; for the freezing point snowflake effect, the ice flower snowflake effect texture is formed by relying on the shrinkage of the UV coating. The amount of UV oil applied on the sample body 421 needs to be increased by 15%-20% compared with the amount of UV oil applied on the actual laser paper to resist tension deformation and ensure the three-dimensional effect of the freezing point snowflake. The thickness of the UV coating on the sample body is increased by about 20% compared with the thickness of the UV coating on the actual laser paper. For the desired effect, a primer and topcoat must be applied. Due to the poor tension stability of sample sheet 421, the primer and topcoat application amounts need to be increased by 10% to resist tension deformation. The UV coating thickness of sample sheet 421 is approximately 10% thicker than that of actual laser paper. For the leather grain effect, the UV coating shrinks to create a leather texture. The UV coating application amount on sample sheet 421 needs to be increased by 10%-15% compared to that on actual laser paper. This resists tension deformation and ensures the leather grain. The UV coating thickness on sample sheet 421 needs to be approximately 10% thicker than that on actual laser paper. When applying the UV treatment effect on the surface of sample sheet 421 in this application, the UV lamp power (preferably 80-120 W / cm2) and exposure time must be controlled to prevent material deformation. For large-area printing, a high-power, medium-speed curing strategy should be used to achieve an optimal balance between a dry surface and a wet interior of the UV coating and material deformation.

[0048] Furthermore, the longitudinal adjustment device 44 includes a driving member 441, a driving threaded shaft 442, a linkage gear 443, and a rack 444. The rotation adjustment device 43 is connected to the rack 444. The output end of the driving member 441 is connected to the driving threaded shaft 442. The outer periphery of the linkage gear 443 meshes with the gear teeth of the driving threaded shaft 442 and the rack 444. When the driving member 441 drives the driving threaded shaft 442 to rotate, the driving threaded shaft 442 drives the rotation adjustment device 43 longitudinally through the linkage gear 443 and the rack 444, thereby adjusting the cover sheet 42 to a preset height. The driving threaded shaft 442 and the linkage gear 443 are fixed to the bearing column 45 via a gear box 447. The rack 444 longitudinally extends through an opening in the gear box 447 and meshes with the linkage gear 443. The rotation adjustment device 43 is fixed to the lower end of the rack 444.

[0049] In the embodiment of the present application, the driving member 441 is a crank assembly, which includes a rocker 445 and a rocker arm 446. The rocker arm 446 is arranged at one end of the rocker 445 so that the user can manually provide power to the longitudinal adjustment device 44. The other end of the rocker 445 is connected to the active threaded shaft 442 so that the active threaded shaft 442 drives the linkage gear 443 to rotate. The active threaded shaft 442 is essentially a screw. The active threaded shaft 442 is horizontally arranged below the linkage gear 443, and the rack 444 is vertically arranged away from the rocker arm 446. It is placed on the side of the linkage gear 443, and the outer periphery of the linkage gear 443 is meshed with the active threaded shaft 442 and the rack 444 at the same time; when the user manually rotates the rocker 445, the rocker 445 drives the active threaded shaft 442 to rotate through the rocker arm 446. During this process, the active threaded shaft 442 converts the circumferential rotation into vertical motion through the linkage gear 443, so that the rack 444 drives the covering piece 42 on the rotation adjustment device 43 to move up and down, ensuring that the covering piece 42 can reach the preset height; the overall structure is simple and easy to operate. Of course, it can be replaced by the driving member 441 can also be driven by a motor to drive the active threaded shaft 442 to rotate; the purpose of the longitudinal adjustment device 44 is to drive the covering piece 42 on the rotation adjustment device 43 to reach the preset height. Therefore, other structures can also be adopted to achieve this technical effect, such as setting the screw motor longitudinally and connecting the output end of the screw motor to the rotation adjustment device 43, and driving the rotation adjustment device 43 to achieve up and down movement through the screw motor. This application does not make specific restrictions here.

[0050] Furthermore, the detection mechanism 3 includes: a mounting frame 31, on which a colorimeter 32 and an optical projection positioner 33 located on one side of the colorimeter 32 are provided, and the optical projection positioner 33 is used to project an enlarged cross positioning mark on the laser paper, so that the colorimeter 32 can locate the position of the dark light column to be measured on the laser paper and its printed matter; a longitudinal movement component 34, which is arranged above the mounting frame 31 to adjust the height difference between the mounting frame 31 and the detection platform 11; a transverse movement component 35, which is arranged on the detection box 1 and above the longitudinal movement component 34 to adjust the position of the mounting frame 31 on the horizontal plane above the detection platform 11; and a camera unit 36 ​​is also provided on the transverse movement component 35.

[0051] In this application, the colorimeter 32 uses an integrating sphere colorimeter 32, and the camera unit 36 ​​uses a micro-industrial CCD. The specific structure and principle belong to the existing technology and will not be elaborated here; wherein, the optical projection locator 33 includes a projection light source 331, a cross-line PVC sheet and a double convex lens 333. The projection light source 331 is preferably an LED light source. The "cross" part of the surface of the cross-line PVC sheet is transparent, and the other positions are black and light-shielding. The projection light source 331, the cross-line PVC sheet and the double convex lens 333 are arranged in sequence from top to bottom along the same axis, and the cross-line PVC sheet 332 is located between 1-2 times the focal length of the double lens; in terms of structural distance relationship, the center position of the enlarged cross positioning mark projected by the optical projection locator 33 onto the laser paper or laser paper products coincides with the sampling area of ​​the colorimeter 32. The principle of the optical projection locator 33 belongs to the existing technology. It should be noted that in the present application, the top sample negative pressure tube 213 will fix the position of the laser paper and printed products through negative pressure suction, and the positioning top sample component 22 will lift the laser paper and its printed products and cooperate with the pressing sample component 21 to bend the laser paper and its printed products. At this time, the cross positioning mark moves to the dark light column position corresponding to the bending position, and then the positioning top sample component 22 is lowered to the height of the detection table 11 to restore the laser paper and its printed products to flatness. The cross positioning mark only moves in the longitudinal direction and does not move forward, backward, left and right, so the cross positioning mark does not shift, that is, the cross positioning mark shifts forward and backward, but the measuring holes of the cross table and the colorimeter 32 are still on the straight line of the dark light column at this position. At this time, the forward and backward movement of the colorimeter 32 does not affect the measurement accuracy; in addition, the position of the cross positioning mark projected on the laser paper and its printed products is within the width area of ​​the arc plate 212.

[0052] In the embodiment of the present application, the transverse movement assembly 35 includes a slide bar 351 and a slider 352. The two seats of the slide bar 351 are respectively slidably set in the horizontal slide groove 10 provided on the left and right side walls of the detection box 1. The slider 352 is slidably set on the slide bar 351. The mounting frame 31 is set below the slider 352 through the longitudinal movement assembly. The transverse movement assembly 35 can drive the mounting frame 31 to move along a plane parallel to the detection table 11 through the longitudinal movement assembly 34. The longitudinal movement assembly 34 can drive the mounting frame 31 to move along a plane close to or away from the detection table 11. The combination of the transverse movement assembly 35 and the longitudinal movement assembly 34 can drive the mounting frame 31 to move in three-dimensional space to ensure that the colorimeter 32 and the optical projection positioner 33 on the mounting frame 31 can be moved to the position to be measured. The transverse and longitudinal movement components 35 and 34 of the present application only need to be able to drive the mounting frame 31 to move in three directions in three-dimensional space. For example, the slide bar 351 can be driven by a belt or synchronous belt drive to move along the direction set by the horizontal slide groove 10. The belt or synchronous belt drive method belongs to the prior art. The slide bar 351 can be provided with a linear module consisting of a slide rail and a sliding block to drive the slider 352 to move along the direction set by the slide bar 351. The linear module structure consisting of the slide rail and the sliding block belongs to the prior art. The longitudinal movement component 34 can be driven by a lead screw or a screw to drive the mounting frame 31 to move longitudinally. The structure of linear motion achieved by a lead screw or a screw drive belongs to the prior art. In addition, the transverse movement component 35 of the present application is also provided with a micro-industrial CCD as a camera unit 36, which can capture images of the laser paper and its printed matter through the cover film 42 in real time, facilitating subsequent image comparison.

[0053] Furthermore, the detection platform 11 includes a front sample placement platform 111 and a rear sample placement platform 112. The front sample placement platform 111 and the rear sample placement platform 112 are arranged at the same height, and an installation space for accommodating the positioning top sample component 22 is provided between the two. The front sample placement platform 111 is provided with a front stop gauge 113 for aligning with the front edge of the sample to be tested when placing the sample. The front sample placement platform 111 is also provided with a front edge scale line 114 for calibrating the sample placement detection position.

[0054] In an embodiment of the present application, the detection table 11 is composed of a front sample table 111 and a rear sample table 112. The front sample table 111 is relatively narrow, and a front stop gauge 113 is fixed laterally on its upper surface. Front edge scale lines 114 are provided at the front edge of the detection cavity opening near the detection box 1 to facilitate the user to adaptively adjust the position of the detection mechanism 3 based on the position of the dark light column.

[0055] This application provides a method for measuring the printing process effect of laser paper, including: Under a standard light source, the laser paper is bent perpendicularly to the bright light column, and the position of the dark light column is determined based on the diffraction pattern formed on the surface of the laser paper; the color value at the dark light column position is measured through the filter cover sheet. Specifically, under a standard light source in the detection box 1, the laser paper is placed on the detection table 11, and the laser paper is bent perpendicularly to the bright light column by the bending mechanism 2. The position of the dark light column is determined based on the diffraction pattern formed on the surface of the laser paper. The laser paper is restored to a flat state, and the detection mechanism 3 is moved to the dark light column position; the position of the filter cover sheet is adjusted by the cover sheet 4, and the filter cover sheet is adhered to the surface of the laser paper. The detection mechanism 3 measures the color value at the dark light column position through the filter cover sheet.

[0056] In order to better explain the measurement of the color value of laser paper, the basic principle of determining the dark light column is first explained here.

[0057] The basic principle for determining dark beams: The surface of beam laser paper features a micro-nano grating structure with a periodic angular arrangement (periodicity of π). This structure is created by sequentially photolithographically patterning grating stripes according to a specific angular pattern during the production of the embossing plate. This micro-nano grating structure is then transferred to the base paper surface via UV embossing. The grating angles parallel to the beam direction are uniform, while the angles perpendicular to the beam direction vary regularly with a specific angular difference. Therefore, when light strikes the surface of the beam laser paper, the different gratings rotate at different angles, creating a specific optical path difference between the rays. This creates a macroscopic visual effect of alternating bright and dark patterns.

[0058] Under a standard light source, the light column laser paper is bent in a direction perpendicular to the bright light column through a mechanical bending method. A number of connected diamond or elliptical diffraction patterns arranged perpendicular to the direction of the bright light column can be formed on the paper surface. The straight line where the two intersection points parallel to the direction of the bright light column are located is the position of the dark light column.

[0059] More specifically, the method for measuring the printing process effect of laser paper is as follows: 1. Selection of laser paper: In the embodiment of the present application, two kinds of light column laser papers are selected (rainbow light column laser paper such as Figure 12 , platinum laser paper Figure 13 The sample to be tested should be cut into a rectangular shape, with one of its length or width parallel or perpendicular to the direction of the bright light beam. The dimensions should include at least one grating period, ensuring that the laser paper and its printed matter can be placed in the test box 1, while the side length along the bright light beam is greater than the length of the front sample placement platform 111 in the front-to-back direction. It should be noted that Figure 12 and Figure 13 The color pictures are used to illustrate the effects of the dark and bright light columns of the laser paper, so as to better understand the principle of determining the position of the dark light column. Figure 12 and Figure 13 , which has no impact on the technical solution of the present invention.

[0060] 2. Determine the position of the dark light column: 1) Place the laser paper on the inspection table 11 of the inspection box 1 with the light beam facing upward and the direction of the bright light beam perpendicular to the front stop 113. Align the front edge of the laser paper with the front stop 113; 2) Manually adjust the length of the telescopic rods 211 of the left and right sample pressing components 21 so that the curved plates 212 move to the upper left and upper right of the laser paper; 3) Activate the positioning sample lifting component 22 through the display control panel on the inspection box 1, so that the sample lifting negative pressure tube 213 absorbs and fixes the laser paper. Then, the sample lifting negative pressure tube 213 is raised by the sample lifting lifting unit 214, and it drives the laser paper to abut the curved plate of the sample pressing component 21. At 212, the lifting stops. As a result, the paper surface is bent in a direction perpendicular to the bright light column and forms a number of connected diamond or elliptical diffraction patterns arranged perpendicular to the bright light column. The straight line where the two foot pads are located parallel to the bright light column is the position of the dark light. 4) The detection mechanism 3 is activated through the display control panel on the detection box 1, so that the optical projection locator 33 transmits the magnified cross positioning mark on the laser paper surface, and then the display control panel is operated to drive the slide bar 351 of the transverse movement assembly 35 to move back and forth in the slide groove of the detection box 1 and the slider 352 to move left and right on the slide bar 351. According to the value of the leading edge scale line 114 corresponding to the position of the dark light column to be measured, the crosshair positioning mark is moved to the position of the dark light column to be measured (the horizontal line of the crosshair positioning mark is parallel to the line connecting the two intersection points of the diffraction pattern perpendicular to the direction of the bright light column, and the vertical line of the crosshair positioning mark is parallel to the line connecting the two intersection points of the diffraction pattern parallel to the direction of the bright light column). At this time, the center of the crosshair positioning mark (the measuring hole of the colorimeter 32 coincides with it) is located at the center of the unit diffraction pattern, that is, the colorimeter 32 is positioned at the position of the dark light column to be measured on the laser paper; 3. Laser paper color detection: 1) Operate the display control panel to position the top sample 1) The top sample lift 214 of component 22 descends to the same height as the plane of the inspection table 11, restoring the flatness of the laser paper. 2) The crank assembly is manually operated to move the filter cover sheet to the same height as the cover sheet scale line and toggle the filter cover sheet's identification handle 433, rotating the filter cover sheet 90°, moving it into the cover sheet hole 12 and attaching it to the laser paper. 3) The display control panel drives the longitudinal movement assembly 34 to move the colorimeter 32 longitudinally onto the filter cover sheet, ensuring that the colorimeter 32 always captures the color of the dark light column to be measured on the laser paper through the filter cover sheet, thereby representing the color of the laser paper itself. Measuring the dark light column position can effectively reduce the influence of the grating structure on the laser paper's surface on color measurement. Furthermore, further measuring the dark light column position through the filter cover sheet can significantly shield diffracted light, improving the accuracy of color measurement.

[0061] This application also provides a method for measuring the printing process effect of laser paper printed products, including: Under a standard light source, bend the laser paper in a direction perpendicular to the bright light column, and determine the position of the dark light column based on the diffraction pattern formed on the surface of the laser paper; measure the color value of the dark light column position through a simulated cover sheet; visually compare and evaluate the surface image of the laser paper attached to the simulated cover sheet with the image of the standard sample; collect the surface image of the laser paper attached to the simulated cover sheet, and compare it with the image of the standard sample for similarity evaluation; measure the color value of the dark light column of the standard sample, and compare the color difference between the color value of the standard sample and the color value of the dark light column position measured through the simulated cover sheet; if the color difference comparison evaluation, visual comparison evaluation, and similarity comparison evaluation are all qualified, the printing process effect of the laser paper print is qualified; among which, the standard sample is a laser paper print that meets the required standards. Specifically, under the standard light source in the detection box 1, the laser paper is placed on the detection table 11, and the laser paper is bent in a direction perpendicular to the bright light column by the bending mechanism 2. The position of the dark light column is determined according to the diffraction pattern formed on the surface of the laser paper, the laser paper is restored to be flat, and the detection mechanism 3 is moved to the dark light column position; the position of the analog filter is adjusted by the covering mechanism 4, and the analog filter is attached to the surface of the laser paper, and the detection mechanism 3 measures the color value of the dark light column position through the analog covering sheet; the standard sample is superimposed on a part of the area on the analog covering sheet, and the surface image of the laser paper attached to the analog covering sheet is visually compared and evaluated with the image of the standard sample; the detection mechanism 3 collects Collect the surface image of the laser paper of the simulated cover sheet and compare it with the image of the standard sample for similarity evaluation; reset the simulated cover sheet and take out the laser paper, keep the standard sample in the detection box 1 and detect the position of the dark light column of the standard sample, measure the color value of the dark light column of the standard sample through the detection mechanism 3, and compare the color value of the standard sample with the color value of the dark light column position measured through the simulated cover sheet for color difference evaluation; if the color difference comparison evaluation, visual comparison evaluation and similarity comparison evaluation are all qualified, the printing process effect of the laser paper print is qualified; among which, the standard sample is a laser paper print that meets the required standards (that is, the laser paper print determined by signing during actual production).

[0062] More specifically, the method for measuring the printing process effect of laser paper prints is as follows: 1. Selection of laser paper: In the embodiment of the present application, two types of light column laser paper (rainbow light column laser paper and platinum light column laser paper) are selected. The shape of the sample to be tested should be cut into a rectangle, and one of its length or width should be parallel or perpendicular to the direction of the bright light column; the specification size should include at least one grating period, while ensuring that the laser paper and its printed matter can be placed in the detection box 1, and the side length along the direction of the bright light column is greater than the length of the front sample placement table 111 in the front-to-back direction.

[0063] 2. Determine the position of the dark light column: 1) Place the laser paper with the light column facing upwards and the direction of the light column perpendicular to the front stop 113 and align the front edge of the laser paper with the front stop 113 on the inspection table 11 of the inspection box 1; 2) Manually adjust the length of the telescopic rods 211 of the left and right pressing components 21 to move the curved plates 212 to the upper left and upper right of the laser paper; 3) Start the positioning sample-top component 22 through the display control panel on the inspection box 1, so that the sample-top negative pressure tube 213 adsorbs and fixes the laser paper, and then the sample-top lifting part 214 raises the sample-top negative pressure tube 213 and stops raising when it drives the laser paper to abut against the curved plate 212 of the sample-top component 21. As a result, the paper surface is bent in the direction perpendicular to the light column and forms an arrangement perpendicular to the direction of the light column. The straight line where the two foot pads are located in the direction of the bright light column is the position of the dark light; 4) the detection mechanism 3 is activated through the display control panel on the detection box 1, so that the optical projection locator 33 transmits the magnified cross positioning mark on the laser paper surface, and then the display control panel is controlled to drive the slide bar 351 of the transverse movement component 35 to move back and forth in the slide groove of the detection box 1 and the slider 352 to move left and right on the slide bar 351, and according to the value of the leading edge scale line 114 corresponding to the position of the dark light column to be measured, the cross positioning mark is moved to the position of the dark light column to be measured (the horizontal line of the cross positioning mark is parallel to the line connecting the two intersection points of the diffraction pattern perpendicular to the direction of the bright light column, and the cross positioning mark is parallel to the line connecting the two intersection points of the diffraction pattern perpendicular to the direction of the bright light column). The vertical line of the mark is parallel to the line connecting the two intersection points of the diffraction pattern parallel to the direction of the bright light column). At this time, the center of the cross-shaped positioning mark (the measurement hole of the colorimeter 32 coincides with it) is located at the center of the unit diffraction pattern, that is, the colorimeter 32 is positioned at the position of the dark light column to be measured on the laser paper. 3. Laser paper color detection: 1) Operate the display control panel to lower the top sample lifting portion 214 of the positioning top sample assembly 22 to the same height as the plane of the testing table 11, so that the laser paper is restored to a flat surface; 2) Manually operate the crank assembly to move the simulated cover sample to the same height as the cover sample scale line and toggle the identification handle 433 of the simulated cover sample to rotate the simulated cover sample 90°, move it into the cover sample hole 12, and cover and adhere it to the upper surface of the laser paper; 3) The display control panel is operated to drive the longitudinal movement assembly 34 to move the colorimeter 32 longitudinally onto the simulated cover sheet, and the colorimeter 32 is constantly collecting the color of the dark light column to be measured on the laser paper through the simulated cover sheet, which represents the color of the laser paper print itself. 4. Simulation and evaluation of the printing process of the laser paper print: 1) A standard sample having the corresponding surface printing process is superimposed on a portion of the simulated cover sheet. Under a standard light source, a visual comparison and evaluation is performed between the laser paper attached to the simulated cover sheet and the standard sample. 2) The display screen panel is operated to activate the camera unit 36 ​​to capture an image of the laser paper through the simulated cover sheet, and the image is then evaluated for similarity with the pre-collected image of the standard sample.3) Move the marking handle 433 of the simulated cover sheet to rotate the simulated cover sheet back to its original position, remove the laser paper from the test box 1, measure the color value of the dark light column of the standard sample through the detection mechanism 3, and compare the color difference between the color value of the standard sample and the color value of the dark light column position measured through the simulated cover sheet; 4) If the color difference comparison evaluation, visual comparison evaluation and image similarity evaluation are all qualified, the printing process effect of the laser paper print is qualified.

[0064] It should be noted that this application primarily describes the structure and method for measuring the process effects of laser paper and printed products. Image acquisition, image processing, data transmission, and other aspects involving computer software control are prior art and fall outside the scope of this application. By employing the aforementioned method for measuring the process effects of laser paper prints, the printing process effects of laser paper prints can be simulated, thereby avoiding the cumbersome and costly process associated with actual printing and improving proofing efficiency.

[0065] In summary, the present invention provides a method and device for measuring the printing process effect of laser paper and its printed products, wherein the printing process effect measuring device of laser paper and its printed products includes: a detection box, a standard light source is provided on the top of the detection box, and a detection platform is provided at the bottom of the detection box; a bending mechanism, the bending mechanism is located in the detection box, and the bending mechanism is located on one side of the detection platform, for bending and flattening the laser paper and its printed products; a detection mechanism, the detection mechanism is located in the detection box and can move parallel or perpendicular to the detection platform, for collecting the color values ​​of the laser paper and the laser paper prints, and collecting the image of the laser paper prints and the image of the standard sample for comparison; a covering mechanism, the covering mechanism is located on one side of the detection box, the covering mechanism includes an adjustment device and a covering sheet provided on the adjustment device, the covering sheet is parallel to the end face of the detection platform, and the adjustment device is used to adjust and drive the covering sheet to fit or move away from the surface of the laser paper. The printing process effect measurement device for laser paper and its printed products of the present application can not only accurately and efficiently complete the color value detection of the light column laser paper, but also can simultaneously and quickly evaluate the finishing process effect of the laser paper printed products, and efficiently complete the simulation proofing of the surface finishing process effect of the laser paper; realize the integrated application of full-process visual effect detection from the raw materials of the packaging printing materials to the surface finishing process in the color box packaging production process.

[0066] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for measuring the printing process effect of laser paper, characterized in that: include: Under a standard light source, bend the laser paper perpendicular to the bright light column, and determine the position of the dark light column based on the diffraction pattern formed on the surface of the laser paper. Measure the color value of the dark light column through the filter cover film.

2. A method for measuring the printing process effect of laser paper printed matter, characterized in that: include: Under a standard light source, bend the laser paper perpendicular to the bright light column, and determine the position of the dark light column based on the diffraction pattern formed on the surface of the laser paper. Measure the color value of the dark light column position through the simulated cover sheet; visually compare and evaluate the surface image of the laser paper attached to the simulated cover sheet with the image of the standard sample; collect the surface image of the laser paper attached to the simulated cover sheet, and compare it with the image of the standard sample for similarity evaluation; measure the color value of the dark light column of the standard sample, and compare the color difference between the color value of the standard sample and the color value of the dark light column position measured through the simulated cover sheet; if the color difference comparison evaluation, visual comparison evaluation and similarity comparison evaluation are all qualified, the printing process effect of the laser paper print is qualified; among which, the standard sample is a laser paper print that meets the required standards.

3. A device for measuring the printing process effect of laser paper and printed matter, characterized in that: include: An inspection box, the top of which is provided with a standard light source, and the bottom of which is provided with an inspection platform; a bending mechanism, located inside the inspection box and on one side of the inspection platform, for bending and restoring the flatness of laser paper and printed products thereof; A detection mechanism, located in the detection box and movable parallel to or perpendicular to the detection platform, for collecting color values ​​of the laser paper and laser paper prints, and collecting images of the laser paper prints and images of standard samples for comparison; The sample covering mechanism is located on one side of the detection box. The sample covering mechanism includes an adjustment device and a sample covering sheet arranged on the adjustment device. The sample covering sheet is parallel to the end face of the detection table. The adjustment device is used to adjust and drive the sample covering sheet to adhere to or away from the surface of the laser paper.

4. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 3, characterized in that: The bending mechanism includes: a sample pressing assembly and a sample positioning and pushing assembly, the sample pressing assembly is located above the positioning and pushing assembly; the sample pressing assembly includes a telescopic rod and a sample pressing plate, one end of the telescopic rod is connected to the side wall of the detection box, and the sample pressing plate is arranged at the other end of the telescopic rod; the positioning and pushing assembly includes a sample pushing negative pressure tube and a sample pushing lifting part, the sample pushing negative pressure tube is located on one side of the detection platform, and the sample pushing lifting part is arranged below the sample pushing negative pressure tube to drive the sample pushing negative pressure tube to be flush with or higher than the detection platform.

5. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 4, characterized in that: The pressure sample plate is an arc-shaped plate, the concave surface of the arc-shaped plate faces one side of the top sample negative pressure tube, and the curvature of the arc-shaped plate is adapted to the curvature of the top sample negative pressure tube.

6. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 4, characterized in that: The top sample negative pressure tube is provided with a plurality of negative pressure suction holes for positioning the laser paper and its printed matter.

7. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 3, characterized in that: The adjustment device includes: a rotation adjustment device and a longitudinal adjustment device for adjusting the height of the rotation adjustment device; the rotation adjustment device includes a rotating shaft frame, and a plurality of the cover sample sheets are relatively independently arranged on the rotating shaft frame through the cover sample rotating shaft, and the cover sample rotating shaft is also provided with an identification handle corresponding to the cover sample sheet for adjusting the position of the cover sample sheet; the cover sample sheet includes a filter cover sample sheet and a simulation cover sample sheet, and the detection box is provided with a cover sample hole for installing the cover sample sheet, so that the cover sample sheet can be attached to the laser paper.

8. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 7, characterized in that: The longitudinal adjustment device includes: a driving member, an active threaded shaft, a linkage gear and a rack, the rotation adjustment device is connected to the rack, the output end of the driving member is connected to the active threaded shaft, and the outer periphery of the linkage gear is engaged with the gear teeth of the active threaded shaft and the rack; when the driving member drives the active threaded shaft to rotate, the active threaded shaft drives the rotation adjustment device to move longitudinally through the linkage gear and the rack, so as to adjust the cover sheet to a preset height.

9. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 3, characterized in that: The detection mechanism includes: a mounting frame, on which a colorimeter and an optical projection locator located on one side of the colorimeter are provided, the optical projection locator is used to project an enlarged cross positioning mark on the laser paper to facilitate the colorimeter to locate the position of the dark light column to be measured; a longitudinal movement component, which is arranged above the mounting frame to adjust the height difference between the mounting frame and the detection platform; a transverse movement component, which is arranged on the detection box and located above the longitudinal movement component to adjust the position of the mounting frame on the horizontal plane above the detection platform; the transverse movement component is also provided with a camera unit.

10. The device for measuring the printing process effect of laser paper and printed matter thereof according to claim 4, characterized in that: The testing platform includes a front sample placement platform and a rear sample placement platform. The front sample placement platform and the rear sample placement platform are arranged at the same height, and an installation space for accommodating the positioning sample top assembly is provided between the two. A front stop gauge is provided on the front sample placement platform for aligning with the front edge of the sample to be tested when placing the sample. A front edge scale line is also provided on the front sample placement platform for calibrating the sample placement detection position.

Images