Printing defect detection tool

Abstract

The utility model relates to the technical field of cigarette printing, in particular to a printing defect detection tool. The device comprises a plurality of films, and the gray levels of the plurality of films are different. At least the film with the minimum gray level is provided with a plurality of line width comparison bodies, and the widths of the plurality of line width comparison bodies are different; the plurality of films are connected according to a gray level increasing or decreasing sequence to form a film ruler; length scale marks are arranged on the film ruler. According to the invention, a film ruler with measurement and gray scale functions is formulated, so that defective products can be identified and judged under a unified standard. Wherein the size of the printing residue point is detected through the length scale line and the line width comparison body, and the color depth of the defect is distinguished through the gray value, so that the data is quantified, and the printing residue point defect of the product is accurately judged.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarette printing, in particular to a printing defect detection tool. Background Technique

[0002] During the printing process of cigarette package products, due to factors such as the accuracy of the printing press, the printing suitability of paper and ink, quality defects of different manifestations will occur on the surface of the printed matter, thus affecting the quality of the products. To ensure that the appearance quality of the products meets the customer's requirements, the printing defects are classified by category and grade, and the products that do not meet the quality requirements are removed. Printing slag spots are one of the most common quality defects in the printing process and are also the most intuitive defects. During printing, due to paper defects, paper powder, ink skin, air bubbles (varnish), splashing oil (spots), etc., circular defects similar to those will appear on the product plate surface. In the selection of the printing process and finished products of cigarette package products, the control and determination of the size and color depth of printing defect slag spots are of great significance to product quality and operation efficiency.

[0003] At present, the identification of product printing defects is mainly through visual inspection, and the size and color depth of slag spots are judged based on experience. Due to human subjective factors, there are differences in the defect judgment results. There is an urgent need to provide a reference detection tool to identify and judge defective products under a unified standard.

[0004] The existing film ruler is a transparent flexible ruler and is a high-precision reference measuring instrument. It can detect data such as points, lines, areas, and angles without expensive measuring instruments. For example, a film ruler for PCB board appearance inspection disclosed in a patent document with the publication number CN219200271U includes a film ruler body. Multiple detection areas are provided on the film ruler body, and the acceptance standards of customers are correspondingly provided on the detection areas. During use, select the corresponding detection area and align the detection area with the corresponding inspection point on the PCB board for comparison to obtain the inspection conclusion.

[0005] This kind of film ruler mainly focuses on the measurement of size data and cannot detect the color depth of printing defect slag spots. Summary of the Utility Model

[0006] The utility model aims to solve the above problems and provides a printing defect detection tool that can detect the size and color depth of printing defect slag spots.

[0007] The technical solution for the present utility model to solve the problem is to provide a printing defect detection tool, which includes several film sheets with different grayscales; at least several line width comparison bodies are provided on the film sheet with the smallest grayscale, and the widths of several said line width comparison bodies are different; several said film sheets are connected in the order of increasing or decreasing grayscale to form a film ruler; length scale lines are provided on the film ruler.

[0008] As a preference of the present utility model, one end of the film ruler is wound around a shaft body, and a holding block is provided at the other end.

[0009] As a preference of the present utility model, the film ruler includes a back surface for fitting with a printed matter and a front surface opposite to the back surface, and the holding block is arranged on the front surface.

[0010] As a preference of the present utility model, it further includes a storage member for storing the film ruler and allowing some film sheets in the film ruler to be drawn out for detection; the storage member includes a housing and at least two bases; the housing includes a pair of opposite side plates, and the two side plates are respectively connected to the two bases through telescopic members; the shaft body is arranged in the housing, and both ends of the shaft body are rotatably connected to the two side plates; an opening through which the surface of the shaft body can pass is provided on one side of the housing close to the base.

[0011] As a preference of the present utility model, the shaft body is rotatably connected to the side plate through a rotating bearing; a sliding groove is provided on the side plate along the direction from the housing to the base, and the rotating bearing is slidably arranged in the sliding groove.

[0012] As a preference of the present utility model, the shaft body includes a mounting portion for rotatably connecting with the side plate and a thickening portion sleeved on the mounting portion, the film ruler is wound around the thickening portion, and the surface of the thickening portion passes through the opening of the housing.

[0013] As a preference of the present utility model, the telescopic member includes a supporting portion arranged on the base and a supporting hole arranged on the side plate for the supporting portion to be inserted into, and the supporting portion and the bottom of the supporting hole are connected through an elastic member.

[0014] As a preference of the present utility model, the total weight of the housing and the shaft body is greater than the maximum elastic force of the elastic member.

[0015] As a preference of the present utility model, the storage member further includes a cover body, the cover body includes a covering portion in contact with both bases and a connecting portion arranged on the covering portion, and the connecting portion is detachably connected to the housing.

[0016] As a preference of the present utility model, a clamping plate for fixing the film ruler is provided on the shaft body.

[0017] Advantages of the present utility model:

[0018] 1. This application has developed a film ruler with measurement and gray scale (shade) functions, enabling defective products to be identified and judged under a unified standard. Among them, the size of printing slag spots is detected by length scale lines and line width comparison bodies. The color shade of printing slag spots is detected by a film ruler with a gray scale gradient. The detection principle is as follows: A film of a certain gray scale is attached to the printing slag spots on the printed matter, and the gray scale of the printing slag spots is compared with that of the film. If the printing slag spots can be observed through this film, it means that the gray scale of the printing slag spots is higher than that of this film; then, a film with a higher gray scale is replaced for comparison until the printing slag spots cannot be observed through the film, thereby obtaining the gray scale of the printing slag spots, that is, its color shade. This application uses gray scale values to distinguish the shade of defect colors, thereby quantifying data to accurately judge the defects of printing slag spots on products.

[0019] 2. In some embodiments, the soft and long film ruler is wound up for storage, which is convenient for the storage of the film ruler; and when in use, different gray scale films can be sequentially pulled out and attached to the printed matter for comparison until the corresponding detection standard is reached and then stopped. There is no need to take out the entire film ruler for use, avoiding problems such as wrinkles and bends of the soft and long film ruler during measurement, and improving the usability of the soft and long film ruler.

[0020] 3. In some embodiments, a storage member is added, which can not only protect the film ruler during storage; but also, during use, the storage member itself will not affect the complete adhesion between the film and the printed matter, ensuring the accuracy of detection. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of an embodiment of a printing defect detection tool;

[0022] Figure 2 is a schematic structural diagram of another embodiment of a printing defect detection tool;

[0023] Figure 3 is a schematic use diagram of another embodiment of a printing defect detection tool;

[0024] Figure 4 is a schematic storage diagram of another embodiment of a printing defect detection tool;

[0025] In the figure: a film ruler 1, a film 11, a line width comparison body 111, length scale lines 112, a shaft body 21, a mounting portion 211, a thickening portion 212, a holding block 22, a clamping plate 23, a housing 31, a side plate 311, a sliding groove 311a, a base 32, a telescopic member 33, a supporting portion 331, an elastic member 332, a cover body 34, a covering portion 341, a connecting portion 342. Detailed implementation manners

[0026] The following are the detailed implementation manners of the present utility model. In combination with the accompanying drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0027] A printing defect detection tool, as Figure 1 shown, includes a plurality of films 11, and the gray levels of the plurality of films 11 are different. The gray level can also be called transparency. The higher the gray level, the lower the transparency: the gray level is 0 and the transparency is 100 for completely transparent, the gray level is 100 and the transparency is 0 for pure black. By setting different gray level values in between, various gray films 11 with different shades can be obtained. In this embodiment, 11 films 11 are provided, and their gray levels are 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0 in sequence; and these films 11 are connected in this order to obtain a relatively long film ruler 1.

[0028] This kind of film ruler 1 can be used for comparative detection of the color depth of printing slag spots on printed matter. There are two detection situations. One is that there is a standard for the color depth of the printing slag spots. When the color of the printing slag spots is higher than this standard, it is considered that this printing slag spot should not appear, and the printing process needs to be adjusted to reduce or eliminate the color of the printing slag spots; when the color of the printing slag spots is lower than this standard, it is considered that this printing slag spot can be ignored. In this case, only the film 11 with the standard gray level needs to be attached to the printing slag spot on the printed matter. When the printing slag spot can be observed through the film 11 with the standard gray level, the printing slag spot should not appear; when the printing slag spot cannot be observed through the film 11 with the standard gray level, the printing slag spot can be ignored. Another situation is that there is no standard and it is necessary to know the specific color depth of each printing slag spot for comparison. In this case, the films 11 are attached to the printing slag spots in sequence according to the ascending order of the gray levels for comparison until the printing slag spot cannot be observed through the film 11. At this time, the gray level of the film 11 is the color depth of the printing slag spot.

[0029] In addition to being used for detecting the color depth, as Figure 1As shown, length scale lines 112 and a number of line width comparison bodies 111 with different widths can be further set on the film ruler 1 for detecting the size of printing slag spots. The length scale lines 112 obtain the length of the printing slag spots by reading the scales, and the line width comparison bodies 111 judge the approximate width of the printing slag spots by comparison. Among them, the width direction of the line width comparison bodies 111 is perpendicular to the length direction of the length scale lines 112, and the length and width of the printing slag spots can be directly measured simultaneously. In addition, it should be noted that the size measurement of the printing slag spots should be carried out under the film 11 with a smaller gray level. Generally, it is selected to be carried out under the film 11 with the smallest gray level. In this embodiment, it is carried out under the film 11 with a gray level of 0 and completely transparent. Therefore, the line width comparison bodies 111 are mainly set on this film 11. At this time, the printing slag spots are more obvious and the measurement is more accurate.

[0030] Since the film ruler 1 is formed by sequentially connecting a plurality of films 11, the length of the film ruler 1 is too long, and the material of the film 11 is soft, there are problems such as inconvenient storage, difficult to fix during measurement, and the excess part scattered, which affects the measurement. Therefore, in some embodiments, as Figure 2 shown, one end of the film ruler 1 is wound around a shaft body 21, and a holding block 22 is provided at the other end. When the film ruler 1 is completely wound around the shaft body 21, it is convenient for storage. When the film ruler 1 needs to be used, only by controlling the holding block 22 and slowly unfolding the film ruler 1 against the surface of the printed matter until the film 11 with the required gray level is unfolded, and the remaining part is still stored on the shaft body 21.

[0031] In some embodiments, in order to ensure the adhesion of the film ruler 1 to the printed matter, as Figure 2 shown, the film ruler 1 includes a back surface for adhering to the printed matter and a front surface opposite to the back surface, and the holding block 22 is provided on the front surface. Among them, the holding block 22 can be made of a material with a higher density, such as a lead block, so that the holding block 22 can be stable on the printed matter and avoid measurement errors caused by the movement of the film ruler 1 during measurement.

[0032] In some embodiments, in order to prevent the whole film ruler 1 or the part that does not need to be used during measurement from falling off the shaft body 21, as Figure 2 shown, a clamping plate 23 for fixing the film ruler 1 is provided on the shaft body 21, and the shaft body 21 and the clamping plate 23 are connected by a spring. The elastic direction of the spring is the radial direction of the shaft body 21. Under the action of the spring, the clamping plate 23 can clamp the film ruler 1 with any winding thickness on the shaft body 21.

[0033] In some embodiments, for further storage and dust prevention, as Figure 3 and Figure 4As shown, it further includes a storage member for storing the film ruler 1 and allowing a part of the film pieces 11 in the film ruler 1 to be drawn out for inspection. Specifically, the storage member first includes a housing 31. In this embodiment, the housing 31 is a cube with an open bottom and a hollow interior, which is formed by splicing four side plates and one top plate. According to Figure 3 In the direction shown in, the left and right side plates 311 in the housing 31 are used to mount the shaft body 21, and both ends of the shaft body 21 are rotatably connected to the two side plates 311 respectively, so that the shaft body 21 and the film ruler 1 wound thereon can be stored in the housing 31.

[0034] When detecting printing defect slag points, it is necessary to completely attach the film ruler 1 to the surface of the printed matter without any gap between them to ensure the accuracy of data reading. If the shaft body 21 and the film ruler 1 wound thereon are completely stored in the housing 31, then during measurement, when a part of the film ruler 1 is drawn out and attached to the surface of the printed matter, due to the certain volume of the housing 31, the end of this part of the film ruler 1 close to the housing 31 cannot be attached to the surface of the printed matter, which may cause measurement errors. Therefore, in this embodiment, a further design is as follows: the shaft body 21 is rotatably connected to the side plate 311 through a rotating bearing; the side plate 311 is provided with a sliding groove 311a along the direction from the bottom opening to the top plate, and the rotating bearing is slidably arranged in the sliding groove 311a.

[0035] During storage, as Figure 4 shown, move the shaft body 21 and the film ruler 1 wound thereon towards the direction close to the top of the housing 31, so that it can be completely stored in the housing 31.

[0036] During measurement, as Figure 3 shown, move the shaft body 21 and the film ruler 1 wound thereon towards the direction close to the bottom opening of the housing 31, so that the film ruler 1 protrudes from the opening, thereby being able to be attached to the printed matter. At this time, it is also necessary to add a base 32 to ensure the stability during measurement: as Figure 3As shown in the figure, the storage member further includes two bases 32. The length and width of the two bases 32 are the same as those of a pair of side plates 311 in the housing 31 for mounting the shaft body 21. The bases 32 are made of a material with a relatively high density, such as lead blocks, to ensure their stability. To adapt to different winding thicknesses of the film ruler 1, the two bases 32 are respectively connected to the two side plates 311 through telescopic members 33. The telescopic member 33 includes a support portion 331 provided on the base 32 and a support hole provided on the side plate 311 for the support portion 331 to insert. The support portion 331 and the bottom of the support hole are connected by an elastic member 332. And the total weight of the housing 31 and the shaft body 21 is greater than the maximum elastic force of the elastic member 332. When measuring at this time, the two bases 32 are stably located on the printed matter, and the housing 31 is located above the bases 32. Under the action of gravity, the housing 31 moves downward automatically until the film ruler 1 fits the printed matter. When the film ruler 1 is continuously unwound and the thickness of the film ruler 1 on the shaft body 21 decreases continuously, the housing 31 will continue to move downward automatically under the action of gravity to keep the film ruler 1 in close contact with the printed matter.

[0037] Among them, in order to enable the surface of the film ruler 1 to protrude from the bottom opening of the housing 31 without affecting the connection between the shaft body 21 and the side plate 311. The shaft body 21 includes a mounting portion 211 for rotatably connecting with the side plate 311 and a thickening portion 212 sleeved on the mounting portion 211. The film ruler 1 is wound around the thickening portion 212. The thickness of the thickening portion 212 is controlled such that: in the case of not winding the film ruler 1, the surface of the thickening portion 212 can protrude from the opening of the housing 31; then no matter how thick the film ruler 1 wound on it is, it can protrude from the opening of the housing 31 and fit onto the printed matter.

[0038] In some embodiments, for further storage and sealing, as Figure 4 shown, the storage member further includes a cover body 34. The cover body 34 includes a covering portion 341 that abuts against both bases 32 and a connecting portion 342 provided on the covering portion 341. The connecting portion 342 is detachably connected to the housing 31. In this embodiment, the cover body 34 is specifically set as a cube with an open top and a hollow interior. The bottom of the cube is the covering portion 341, and a pressing plate is hinged on the side of the cube as the connecting portion 342. When in use, the bases 32 and the housing 31 are placed into the cube so that the bases 32 abut against the covering portion 341, and then the pressing plate is rotated so that the pressing plate presses on the top of the housing 31.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art of the present utility model can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A printing defect detection tool, characterized in that: It comprises a plurality of film sheets (11), wherein the grayscales of the plurality of film sheets (11) are different; at least the film sheet (11) with the smallest grayscale is provided with a plurality of line width comparison bodies (111), and the widths of the plurality of line width comparison bodies (111) are different; A plurality of the film sheets (11) are connected in an order of increasing or decreasing grayscale to form a film ruler (1); the film ruler (1) is provided with length scale lines (112).

2. A printing defect detection tool according to claim 1, characterized in that: One end of the film ruler (1) is rolled up on an axle (21), and the other end is provided with a gripping block (22).

3. A printing defect detection tool according to claim 2, characterized in that: The film ruler (1) comprises a back side for bonding with printed matter, and a front side opposite to the back side, and the gripping block (22) is arranged on the front side.

4. A printing defect detection tool according to claim 2, characterized in that: It also includes a storage piece for storing the film ruler (1) and allowing a portion of the film sheet (11) in the film ruler (1) to be extracted for testing; The storage piece comprises a shell (31) and at least two bases (32); The housing (31) comprises a pair of opposite side panels (311), and the two side panels (311) are respectively connected to the two bases (32) via telescopic members (33); The shaft body (21) is disposed in the housing (31), and two ends of the shaft body (21) are rotatably connected to the two side plates (311) respectively; A surface of the housing (31) close to the base (32) is provided with an opening through which the surface of the shaft body (21) can pass.

5. A printing defect detection tool according to claim 4, characterized in that: The shaft body (21) is rotatably connected to the side plate (311) via a rotating bearing; the side plate (311) is provided with a slide groove (311a) along a direction from the housing (31) to the base (32), and the rotating bearing is slidably arranged in the slide groove (311a).

6. A printing defect detection tool according to claim 4, characterized in that: The shaft body (21) comprises a mounting portion (211) for being rotatably connected to the side plate (311), and a thickened portion (212) sleeved on the mounting portion (211); the film ruler (1) is wound on the thickened portion (212); and a surface of the thickened portion (212) passes through an opening of the housing (31).

7. A printing defect detection tool according to claim 4, characterized in that: The telescopic member (33) comprises a support portion (331) arranged on the base (32), and a support hole arranged on the side plate (311) and capable of inserting the support portion (331), wherein the support portion (331) is connected to the bottom of the support hole via an elastic member (332).

8. A printing defect detection tool according to claim 7, characterized in that: The total weight of the housing (31) and the shaft (21) is greater than the maximum elastic force of the elastic member (332).

9. A printing defect detection tool according to claim 4, characterized in that: The storage piece further comprises a cover body (34), the cover body (34) comprising a covering portion (341) abutting against both bases (32), and a connecting portion (342) arranged on the covering portion (341), the connecting portion (342) being detachably connected to the shell (31).

10. A printing defect detection tool according to claim 2, characterized in that: The shaft body (21) is provided with a clamping plate (23) for fixing the film ruler (1).

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