Device and method for measuring color of pearlescent ink

Abstract

The invention discloses a pearlescent ink color measuring device. Comprising a vertical plate, a placing plate is arranged on the workbench, and pressing plates are arranged on the two sides of the placing plate; a hollow shaft column is installed in the middle of the vertical plate, an inner shaft column is connected into the hollow shaft column, a first connecting rod is eccentrically installed on the hollow shaft column, and a first rotating head and a light source are connected to the end of the first connecting rod; a second connecting rod is eccentrically installed on one side of the inner shaft column, and a second rotating head and a detector are installed at the end of the second connecting rod. The invention discloses a pearlescent ink color measurement method. The method comprises the following steps: S1, placing pearlescent ink test paper; s2, setting various parameters by the control cabinet; s3, adjusting the detection angle of the light source; s4, adjusting the detection angle of the detector; s5, detecting the pearlescent ink test paper; the pearlescent ink test paper can be conveniently pressed and held by the pressing and holding plate, multiple detection modes are adopted for detection, and the angle can be conveniently adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of pearlescent ink color measurement, and in particular relates to a pearlescent ink color measurement device and method. Background Art

[0002] Cigarette tipping paper, also known as tipping paper, is used to wrap cigarette filter rods and connect them to the end of the tobacco rod. Cigarette tipping paper is mostly printed with gravure spot colors to present color decoration effects. In recent years, some high-end cigarette tipping papers are often overprinted with a layer of pearlescent ink after printing spot colors to further decorate the surface of cigarette tipping paper. The printed pearlescent ink layer will change in appearance with changes in lighting and observation geometry, and can produce a pearlescent effect and be shiny, attracting consumers' attention and increasing the added value of the product. The pearlescent effect of pearlescent ink due to angle changes brings special visual effects, but also brings challenges to its color measurement and computer color matching. At present, some researchers have specifically analyzed the color rendering characteristics of pearlescent ink and explored the color measurement method for pearlescent ink quality evaluation. However, the influence of pearlescent ink on spot color printing color matching is still unclear, and the optimal color measurement geometry for spot color matching of tipping paper under pearlescent ink coverage has not yet been determined.

[0003] Different from ordinary ink pigments, pearlescent pigments used in pearlescent inks are composed of metal oxides (such as Fe2O3 and TiO2) coated with ground mica and other base material particles. Mica is coated with metal oxides to form a layered flaky structure. When light encounters translucent pearlescent pigment flakes: on the one hand, due to the different refractive indices between layers, multiple reflections will occur on its surface; on the other hand, when multiple beams of light that have experienced different optical paths inside are reflected in parallel, interference will occur between the light beams; ultimately, a metallic glitter effect and a pearl-like iridescence effect will be produced.

[0004] For spot color prints covered with pearlescent ink layers, the substrate is used as the substrate, on which a spot color ink film layer is first printed, and then covered with a pearlescent ink film layer. In the translucent pearlescent ink film layer, part of the incident light is reflected, while the other part of the light will pass through the pearlescent ink film layer and enter the spot color ink layer. When the light encounters the spot color ink pigment particles, absorption and scattering effects will occur, and the remaining part will be scattered at different angles and continue to propagate. When the light continues to propagate downward and encounters the translucent substrate, part of it is reflected, part of it is absorbed, and part of it is transmitted out. After the ink film layer of the printed matter is irradiated by light, its complex chemical and physical properties make only part of the light reflected. The reflected light enters the human eye to form a color perception, that is, the color characteristics of an object can be characterized and determined by its spectral reflectance characteristics, which can be measured by spectrophotometry. Due to different lighting and measurement geometry conditions, the spectral reflectance characteristics of most objects are different.

[0005] However, when the existing measuring device is used, the measuring angle is generally fixed. It only needs to place the device on the test paper, or the test paper is placed on the measuring device. It is not convenient to adjust the angle, which makes the use of the device inconvenient and the detection method is single. Therefore, we propose a pearlescent ink color measurement device and method. Summary of the invention

[0006] The object of the present invention is to provide a pearlescent ink color measurement device and method to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pearlescent ink color measuring device, comprising a vertical plate, a workbench welded on one side of the vertical plate, a placement plate for placing pearlescent ink test paper on the workbench, holding plates for pressing the pearlescent ink test paper on both sides of the placement plate, the tail end of the holding plate is sleeved on a threaded column, and the threaded column is used to position the holding plate, and the upper and lower sides of the threaded column are respectively sleeved with a first spring and a second spring, and the opposite surfaces of the first spring and the second spring are both attached to the two sides of the tail end of the holding plate, and the other end of the first spring is attached to the placement plate, and a locking horn nut is threadedly connected to the threaded column;

[0008] A hollow shaft column is movably installed in the middle of the vertical plate, and an inner shaft column is movably connected inside the hollow shaft column, a first connecting rod is eccentrically installed on the hollow shaft column, and a first rotating head is movably connected to the end of the first connecting rod, and a light source is fixedly provided on the first rotating head. The tail end of the hollow shaft column is provided with teeth at the rear of the vertical plate, and a first servo motor is installed at the lower part of the vertical plate, and a gear is keyed on the output shaft of the first servo motor, and the gear is meshed with the teeth on the hollow shaft column. Power is output through the first servo motor, and the gear is meshed with the teeth, thereby driving the hollow shaft column to rotate, so as to realize the rotation and position adjustment of the first connecting rod, the first rotating head and the light source;

[0009] A second connecting rod is eccentrically mounted on one side of the inner shaft column, a second rotating head is movably mounted on the end of the second connecting rod, a detector is mounted on the lower part of the second rotating head, a connecting column is mounted on the upper part of the second rotating head, a light trap plate is rotatably mounted on the connecting column, and a second servo motor is connected to the rear end of the inner shaft column located on the vertical plate, the second servo motor is used as a power source to drive the inner shaft column to rotate, so as to realize rotation and position adjustment of the second connecting rod, the second rotating head and the detector.

[0010] Preferably, a support plate is welded to the bottom of the rear end of the vertical plate, the first servo motor is fixedly mounted on the support plate, and the second servo motor is fixedly mounted on the upper part of the first servo motor.

[0011] Preferably, a limiting ring is provided at the rear end of the hollow shaft column, the teeth are arranged on one side of the limiting ring, and the other side of the limiting ring is attached to the back side of the vertical plate.

[0012] Preferably, a supporting leg is welded to the front end of the bottom of the workbench, and the supporting leg is kept flush with the bottom of the vertical plate for supporting the equipment. Fixed plates are respectively fixed on both sides of the upper part of the workbench, and the two ends of the placement plate are respectively fixedly installed on the upper ends of the fixed plates.

[0013] Preferably, the threaded column is connected through the interior of the placement plate and the fixing plate, a fitting plate is sleeved on the threaded column, the fitting plate is located between the second spring and the locking horn nut, and one end of the holding plate is fitted onto the placement plate.

[0014] Preferably, the rear end of the first rotating head is connected to a first damping shaft rod, one end of the first damping shaft rod is movably connected to the inside of the first connecting rod, and the end of the first connecting rod is threadedly connected to a first anti-drop cap.

[0015] Preferably, the rear end of the second rotating head is connected to a second damping shaft rod, one end of the second damping shaft rod is movably connected to the inside of the second connecting rod, and the end of the second connecting rod is threadedly connected to a second anti-drop cap.

[0016] Preferably, the connecting column on the second rotating head movably mounts the light trap plate via a pin, and the light trap plate rotates via the pin. The light trap plate is used for excluding the measurement of specular reflection.

[0017] Preferably, a control cabinet is fixedly installed between the fixed plate, the placement plate and the workbench, a display screen is embedded in the front end of the control cabinet, a plurality of control buttons are provided on one side of the display screen, and the control cabinet is electrically connected to the first servo motor, the second servo motor, the light source and the detector respectively.

[0018] A pearlescent ink color measurement method comprises the following steps:

[0019] S1. Placing the pearlescent ink test paper: placing the pearlescent ink test paper on the placement board, and clamping the two ends of the pearlescent ink test paper at the lower part of the holding plate respectively, and when the holding plate is in use, adjusting the tightness of the first spring and the second spring by locking the horn nut, so as to control the holding tightness of the holding plate, and stably holding and fixing the pearlescent ink test paper;

[0020] S2. Set various parameters in the control cabinet: set and control through the display screen and several control buttons on the control cabinet, that is, set the angle of the light source and the detector, so as to facilitate the pearlescent ink test paper;

[0021] S3. Adjust the detection angle of the light source: after setting various parameters, the control cabinet controls the first servo motor to start, and the first servo motor drives the hollow shaft column to rotate through gears and teeth, so that the first connecting rod, the first rotating head and the light source are adjusted to appropriate positions, and the first rotating head is rotated through the first damping shaft rod to adjust the facing direction of the light source;

[0022] S4. Adjust the detection angle of the detector: After setting various parameters, the control cabinet controls the second servo motor to start, and the second servo motor drives the inner shaft column to rotate, so that the second connecting rod, the second rotating head and the detector are adjusted to a suitable position, and the second rotating head is rotated by the second damping shaft rod to adjust the facing direction of the detector;

[0023] S5. Testing the pearlescent ink test paper: setting the reflection measurement geometry to 45°a:0°, di / 8° and de / 8°;

[0024] In the geometric condition structure of 45°a:0°, the light source is located at the center vertex of the sampling hole, and its central axis is on the normal line of the sampling aperture. After the optical path design, the sampling aperture is uniformly illuminated from all directions with a half angle of 45°; the detector is directly above the center of the sampling hole, and the central axis uniformly receives the radiation reflected by the sample along the normal line of the sampling aperture; the geometric condition of 45°a:0° and di / 8° can minimize the influence of sample texture and direction selective reflection, that is, the pearlescent effect information contained in the measurement is minimal;

[0025] In the geometric condition structure of di / 8°, light is diffused uniformly on the sample surface from all directions within the hemisphere of the sampling aperture surface, and the central axis of the detector is at an angle of 8° to the central normal of the sampling aperture to receive the reflected light from the sample; de / 8° meets the geometric condition of di / 8°, but a light trap plate is set on the other side of the detector that is at an angle of 8° to the central normal of the sampling aperture. When measuring, the light trap plate can be used to achieve measurement that excludes specular reflection; for pearlescent ink, its pearlescent effect is not obvious when observed under diffuse light, that is, diffuse light incidence can effectively suppress the pearlescent effect to a certain extent; the measurement result of di / 8° includes the pearlescent effect that is partially suppressed by diffuse light, while de / 8° further excludes the pearlescent effect.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] When the present invention is used, the pearlescent ink test paper is placed by the placement plate, and the pressing plate is locked and adjusted by locking the horn nut, the first spring and the second spring, so that the pressing plate can press the pearlescent ink test paper and maintain the stability of the installation;

[0028] In order to realize detection of multiple detection methods and facilitate angle adjustment, the first servo motor drives the hollow shaft column to rotate, so that the first connecting rod, the first rotating head and the light source can realize angle adjustment, which is convenient for irradiating the pearlescent ink test paper, and the second servo motor drives the inner shaft column to rotate, so that the second connecting rod, the second rotating head and the detector can realize angle adjustment, which is convenient for receiving the light reflected by the pearlescent ink test paper and realizing color measurement of the pearlescent ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front structural schematic diagram of the present invention;

[0030] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0031] Figure 3 It is a partial structural schematic diagram of the present invention;

[0032] Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0033] Figure 5 It is a schematic diagram of the steps of the present invention;

[0034] Figure 6 This is a schematic diagram of the measurement condition of the present invention with the geometric condition of 45°a:0°;

[0035] Figure 7 It is a schematic diagram of the measurement conditions of di / 8° and de / 8° of the present invention.

[0036] In the figure: 1, vertical plate; 2, workbench; 3, fixed plate; 4, placement plate; 5, holding plate; 6, threaded column; 7, first spring; 8, second spring; 9, fitting plate; 10, locking horn nut; 11, hollow shaft column; 12, inner shaft column; 13, limit ring; 14, teeth; 15, first servo motor; 16, gear; 17, second servo motor; 18, second connecting rod; 19, second damping shaft rod; 20, second rotating head; 21, detector; 22, connecting column; 23, pin; 24, light trap plate; 25, first connecting rod; 26, first damping shaft rod; 27, first rotating head; 28, light source; 29, support plate; 30, support leg; 31, control cabinet; 32, display screen; 33, control button; 34, first anti-drop cap; 35, second anti-drop cap. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-Figure 4 The present invention provides a technical solution: a pearlescent ink color measuring device, comprising a vertical plate 1, a workbench 2 is welded on one side of the vertical plate 1, a placement plate 4 for placing pearlescent ink test paper is provided on the workbench 2, and holding plates 5 for pressing the pearlescent ink test paper are provided on both sides of the placement plate 4, the tail end of the holding plate 5 is sleeved on a threaded column 6, and the threaded column 6 is used to position the holding plate 5, and the upper and lower sides of the threaded column 6 are respectively sleeved with a first spring 7 and a second spring 8, and the opposite surfaces of the first spring 7 and the second spring 8 are both attached to the two sides of the tail end of the holding plate 5, and the other end of the first spring 7 is attached to the placement plate 4, and a locking horn nut 10 is threadedly connected to the threaded column 6;

[0039] A hollow shaft column 11 is movably installed in the middle of the vertical board 1, and an inner shaft column 12 is movably connected inside the hollow shaft column 11. A first connecting rod 25 is eccentrically installed on the hollow shaft column 11, and a first rotating head 27 is movably connected to the end of the first connecting rod 25. A light source 28 is fixedly provided on the first rotating head 27. A tail end of the hollow shaft column 11 is provided with teeth 14 at the rear of the vertical board 1. A first servo motor 15 is installed at the lower part of the vertical board 1. A gear 16 is keyed to the output shaft of the first servo motor 15, and the gear 16 is meshedly connected with the teeth 14 on the hollow shaft column 11. Power is output through the first servo motor 15, and the gear 16 is meshedly connected with the teeth 14, thereby driving the hollow shaft column 11 to rotate, so as to realize the rotation and position adjustment of the first connecting rod 25, the first rotating head 27 and the light source 28;

[0040] A second connecting rod 18 is eccentrically mounted on one side of the inner shaft column 12, a second rotating head 20 is movably mounted on the end of the second connecting rod 18, a detector 21 is mounted at the lower portion of the second rotating head 20, a connecting column 22 is mounted at the upper portion of the second rotating head 20, a light trap plate 24 is rotatably mounted on the connecting column 22, and a second servo motor 17 is connected to the inner shaft column 12 at the rear end of the vertical plate 1, the second servo motor 17 is used as a power source to drive the inner shaft column 12 to rotate, so as to realize the rotation and position adjustment of the second connecting rod 18, the second rotating head 20 and the detector 21.

[0041] In order to achieve the installation and fixation of the first servo motor 15 and the second servo motor 17, in the present embodiment, preferably, a support plate 29 is welded to the bottom of the rear end of the vertical plate 1, the first servo motor 15 is fixedly mounted on the support plate 29, and the second servo motor 17 is fixedly mounted on the upper part of the first servo motor 15.

[0042] In order to ensure that the hollow main shaft 11 can be stably installed and easy to rotate, in this embodiment, preferably, a limiting ring 13 is provided at the tail end of the hollow shaft column 11, and the teeth 14 are arranged on one side of the limiting ring 13, and the other side of the limiting ring 13 is attached to the back side of the vertical plate 1.

[0043] In order to support the equipment, maintain the balance and stability of the equipment, and fix the placement plate 4, in this embodiment, preferably, a support leg 30 is welded to the front end of the bottom of the workbench 2, and the support leg 30 is flush with the bottom of the vertical plate 1 to support the equipment. Fixed plates 3 are respectively fixed on both sides of the upper part of the workbench 2, and the two ends of the placement plate 4 are respectively fixedly installed on the upper ends of the fixed plates 3.

[0044] In order to adjust the tightness of the holding plate 5 so that the holding plate 5 can stably hold the pearlescent ink test paper, in the present embodiment, preferably, the threaded column 6 is connected through the inside of the placement plate 4 and the fixed plate 3, and a bonding plate 9 is sleeved on the threaded column 6, and the bonding plate 9 is between the second spring 8 and the locking bull horn nut 10, and one end of the holding plate 5 is bonded to the placement plate 4.

[0045] In order to enable the first rotating head 27 to be rotatably adjusted and facilitate the light source 28 to irradiate the pearlescent ink test paper, in the present embodiment, preferably, the rear end of the first rotating head 27 is connected to a first damping shaft rod 26, one end of the first damping shaft rod 26 is movably connected to the inside of the first connecting rod 25, and the end of the first connecting rod 25 is threadedly connected to a first anti-drop cap 34.

[0046] In order to realize the rotation adjustment of the second rotating head 20 and facilitate the detection head 21 to receive the reflected light, in the present embodiment, preferably, the rear end of the second rotating head 20 is connected with a second damping shaft rod 19, one end of the second damping shaft rod 19 is movably connected to the inside of the second connecting rod 18, and the end of the second connecting rod 18 is threadedly connected with a second anti-drop cap 35.

[0047] In order to achieve measurement excluding mirror reflection, in this embodiment, preferably, the connecting column 22 on the second rotating head 20 is movably mounted with the light trap plate 24 through the pin shaft 23, and the light trap plate 24 is rotated by the pin shaft 23, and the light trap plate 24 is used for measurement excluding mirror reflection.

[0048] In order to realize automatic control and adjustment of the equipment, facilitate precise rotation and adjustment of the angle, and realize the display of the detection data, in the present embodiment, preferably, a control cabinet 31 is fixedly installed between the fixed plate 3, the placement plate 4 and the workbench 2, and a display screen 32 is embedded in the front end of the control cabinet 31. A plurality of control buttons 33 are provided on one side of the display screen 32. The control cabinet 31 is electrically connected to the first servo motor 15, the second servo motor 17, the light source 28 and the detector 21, respectively.

[0049] refer to Figure 5-7 , a pearlescent ink color measurement method, comprising the following steps:

[0050] S1. Place the pearlescent ink test paper: Place the pearlescent ink test paper on the placement plate 4, and clamp the two ends of the pearlescent ink test paper at the lower part of the holding plate 5 respectively. When the holding plate 5 is in use, the tightness of the first spring 7 and the second spring 8 is adjusted by tightening the horn nut 10, so as to control the holding tightness of the holding plate 5 and stably hold and fix the pearlescent ink test paper.

[0051] S2, the control cabinet 31 sets various parameters: the display screen 32 and a number of control buttons 33 on the control cabinet 31 are used to set and control, that is, to set the angles of the light source 28 and the detector 21, so as to facilitate the pearlescent ink test paper;

[0052] S3. Adjust the detection angle of the light source 28: After setting various parameters, the control cabinet 31 controls the first servo motor 15 to start, and the first servo motor 15 drives the hollow shaft column 11 to rotate through the gear 16 and the teeth 14, so that the first connecting rod 25, the first rotating head 27 and the light source 28 are adjusted to appropriate positions, and the first rotating head 27 is rotated through the first damping shaft rod 26 to adjust the facing direction of the light source 28;

[0053] S4. Adjust the detection angle of the detector 21: After setting various parameters, the control cabinet 31 controls the second servo motor 17 to start, and the second servo motor 17 drives the inner shaft column 12 to rotate, so that the second connecting rod 18, the second rotating head 20 and the detector 21 are adjusted to a suitable position, and the second rotating head 20 is rotated by the second damping shaft rod 19 to adjust the facing direction of the detector 21;

[0054] S5. Testing the pearlescent ink test paper: setting the reflection measurement geometry to 45°a:0°, di / 8° and de / 8°;

[0055] In the geometric condition structure of 45°a:0°, the light source 28 is located at the central vertex of the sampling hole, and its central axis is on the normal line of the sampling aperture. After the optical path design, the sampling aperture is uniformly illuminated from all directions with a half angle of 45°; the detector 21 is directly above the center of the sampling hole, and the central axis uniformly receives the radiation reflected by the sample along the normal line of the sampling aperture; the geometric condition of 45°a:0° and di / 8° can minimize the influence of sample texture and direction selective reflection, that is, the pearlescent effect information contained in the measurement is minimal;

[0056] In the geometric condition structure of di / 8°, light is uniformly diffused on the sample surface from all directions within the hemisphere of the sampling aperture surface, and the central axis of the detector 21 is at an angle of 8° to the central normal of the sampling aperture to receive the sample reflected light; de / 8° meets the geometric condition of di / 8°, but a light trap plate 24 is set on the other side of the detector 21 that is at an angle of 8° to the central normal of the sampling aperture. When measuring, the light trap plate 24 can be used to achieve measurement that excludes specular reflection; for pearlescent ink, its pearlescent effect is not obvious when observed under diffuse light, that is, the incident diffuse light can effectively suppress the pearlescent effect to a certain extent; the measurement result of di / 8° includes the pearlescent effect that is partially suppressed by the diffuse light, while de / 8° further excludes the pearlescent effect.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pearlescent ink color measuring device, comprising a vertical plate (1), characterized in that: A workbench (2) is welded to one side of the vertical plate (1), and a placement plate (4) for placing pearlescent ink test paper is provided on the workbench (2), and holding plates (5) for holding the pearlescent ink test paper are provided on both sides of the placement plate (4), and the rear end of the holding plate (5) is sleeved on the threaded column (6), and the threaded column (6) is used to position the holding plate (5), and the upper and lower sides of the threaded column (6) are respectively sleeved with a first spring (7) and a second spring (8), and the opposite surfaces of the first spring (7) and the second spring (8) are both attached to the two sides of the rear end of the holding plate (5), and the other end of the first spring (7) is attached to the placement plate (4), and a locking horn nut (10) is threadedly connected to the threaded column (6); A hollow shaft column (11) is movably installed in the middle of the vertical plate (1), and an inner shaft column (12) is movably connected inside the hollow shaft column (11). A first connecting rod (25) is eccentrically installed on the hollow shaft column (11), and a first rotating head (27) is movably connected to the end of the first connecting rod (25). A light source (28) is fixedly installed on the first rotating head (27). The tail end of the hollow shaft column (11) is provided with teeth (14) at the rear of the vertical plate (1), and a first A servo motor (15), wherein a gear (16) is keyed to an output shaft of the first servo motor (15), and the gear (16) is meshedly connected with the teeth (14) on the hollow shaft column (11). Power is output through the first servo motor (15), and the gear (16) is meshedly connected with the teeth (14), thereby driving the hollow shaft column (11) to rotate, thereby realizing rotation adjustment of the positions of the first connecting rod (25), the first rotating head (27) and the light source (28); A second connecting rod (18) is eccentrically mounted on one side of the inner shaft column (12); a second rotating head (20) is movably mounted on the end of the second connecting rod (18); a detector (21) is mounted on the lower part of the second rotating head (20); a connecting column (22) is mounted on the upper part of the second rotating head (20); a light trap plate (24) is rotatably mounted on the connecting column (22); a second servo motor (17) is connected to the rear end of the inner shaft column (12) located on the vertical plate (1); the second servo motor (17) is used as a power source to drive the inner shaft column (12) to rotate, thereby realizing rotation and position adjustment of the second connecting rod (18), the second rotating head (20) and the detector (21).

2. A pearlescent ink color measuring device according to claim 1, characterized in that: A support plate (29) is welded to the bottom of the rear end of the vertical plate (1), the first servo motor (15) is fixedly mounted on the support plate (29), and the second servo motor (17) is fixedly mounted on the upper part of the first servo motor (15).

3. The pearlescent ink color measuring device according to claim 1, characterized in that: A limiting ring (13) is provided at the rear end of the hollow shaft column (11), the teeth (14) are arranged on one side of the limiting ring (13), and the other side of the limiting ring (13) is attached to the back side of the vertical plate (1).

4. The pearlescent ink color measuring device according to claim 1, characterized in that: A support leg (30) is welded to the front end of the bottom of the workbench (2), and the support leg (30) is kept flush with the bottom of the vertical plate (1) and is used to support the equipment. Fixed plates (3) are respectively fixed on both sides of the upper part of the workbench (2), and the two ends of the placement plate (4) are respectively fixedly mounted on the upper ends of the fixed plates (3).

5. A pearlescent ink color measuring device according to claim 4, characterized in that: The threaded column (6) is connected through the inside of the placement plate (4) and the fixing plate (3), and a fitting plate (9) is sleeved on the threaded column (6). The fitting plate (9) is located between the second spring (8) and the locking horn nut (10), and one end of the holding plate (5) is fitted on the placement plate (4).

6. The pearlescent ink color measuring device according to claim 1, characterized in that: The rear end of the first rotating head (27) is connected to a first damping shaft rod (26), one end of the first damping shaft rod (26) is movably connected to the inside of the first connecting rod (25), and the end of the first connecting rod (25) is threadedly connected to a first anti-drop cap (34).

7. The pearlescent ink color measuring device according to claim 1, characterized in that: The rear end of the second rotating head (20) is connected to a second damping shaft rod (19), one end of the second damping shaft rod (19) is movably connected to the inside of the second connecting rod (18), and the end of the second connecting rod (18) is threadedly connected to a second anti-drop cap (35).

8. The pearlescent ink color measuring device according to claim 1, characterized in that: The connecting column (22) on the second rotating head (20) is movably mounted with the light trap plate (24) via a pin shaft (23); the light trap plate (24) is rotated via the pin shaft (23); and the light trap plate (24) is used for measurement that excludes specular reflection.

9. A pearlescent ink color measuring device according to claim 4, characterized in that: A control cabinet (31) is fixedly installed between the fixing plate (3), the placement plate (4) and the workbench (2); a display screen (32) is embedded in the front end of the control cabinet (31); a plurality of control buttons (33) are provided on one side of the display screen (32); and the control cabinet (31) is electrically connected to the first servo motor (15), the second servo motor (17), the light source (28) and the detector (21) respectively.

10. A pearlescent ink color measurement method, characterized in that: The following steps are included: S1. Placing the pearlescent ink test paper: placing the pearlescent ink test paper on the placement plate (4), and clamping the two ends of the pearlescent ink test paper at the lower part of the holding plate (5), and when the holding plate (5) is in use, the tightness of the first spring (7) and the second spring (8) is adjusted by tightening the horn nut (10), so as to control the holding tightness of the holding plate (5) and stably hold and fix the pearlescent ink test paper; S2, setting various parameters in the control cabinet (31): setting and controlling are performed through the display screen (32) and a plurality of control buttons (33) on the control cabinet (31), that is, setting the angles of the light source (28) and the detector (21), so as to facilitate the pearlescent ink test paper; S3, adjusting the detection angle of the light source (28): after setting various parameters, the control cabinet (31) controls the first servo motor (15) to start, and the first servo motor (15) drives the hollow shaft column (11) to rotate through the gear (16) and the teeth (14), so that the first connecting rod (25), the first rotating head (27) and the light source (28) are adjusted to appropriate positions, and the first rotating head (27) is rotated through the first damping shaft rod (26) to adjust the facing direction of the light source (28); S4, adjusting the detection angle of the detector (21): after setting various parameters, the control cabinet (31) controls the second servo motor (17) to start, and the second servo motor (17) drives the inner shaft column (12) to rotate, so that the second connecting rod (18), the second rotating head (20) and the detector (21) are adjusted to a suitable position, and the second rotating head (20) is rotated by the second damping shaft rod (19) to adjust the facing direction of the detector (21); S5. Testing the pearlescent ink test paper: setting the reflection measurement geometry to 45°a:0°, di / 8° and de / 8°; In the geometric condition structure of 45°a:0°, the light source (28) is located at the central vertex of the sampling hole, and its central axis is on the normal line of the sampling aperture. After the optical path design, the sampling aperture is uniformly illuminated from all directions with a half angle of 45°; the detector (21) is directly above the center of the sampling hole, and the central axis uniformly receives the radiation reflected by the sample along the normal line direction of the sampling aperture; the geometric condition of 45°a:0° and di / 8° can minimize the influence of sample texture and direction selective reflection, that is, the pearlescent effect information contained in the measurement is minimal; In the geometric condition structure of di / 8°, light is uniformly diffused on the sample surface from all directions within the hemisphere of the sampling aperture surface, and the central axis of the detector (21) is at an angle of 8° with the central normal of the sampling aperture to receive the sample reflected light; de / 8° meets the geometric condition of di / 8°, but a light trap plate (24) is set on the other side of the detector (21) that is at an angle of 8° with the central normal of the sampling aperture, and the light trap plate (24) can be used during measurement to achieve measurement that excludes specular reflection; for pearlescent ink, its pearlescent effect is not obvious when observed under diffuse light, that is, diffuse light incidence can effectively suppress the pearlescent effect to a certain extent; the measurement result of di / 8° includes the pearlescent effect that is partially suppressed by diffuse light, while de / 8° further excludes the pearlescent effect.

Images