A reverse surface oil paste position positioning and hollowing process label and its preparation method

Abstract

The present invention discloses a reverse surface oil pasting position positioning and hollowing process label and a preparation method thereof. The key points of the technical solution are as follows: A reverse surface oil pasting position positioning and hollowing process label includes a label body. The label body is composed of a base paper layer, a UV ink printed hollowing layer, a reverse bottom oil hollowing layer, and a reverse surface oil hollowing layer stacked in sequence. One side wall position of the base paper layer is arranged in an exposed state. The distance between the UV ink printed hollowing layer and the side wall edge of the base paper layer, the distance between the reverse bottom oil hollowing layer and the side wall edge of the base paper layer, and the distance between the reverse surface oil hollowing layer and the side wall edge of the base paper layer increase in sequence. After the label body is wound around once, the other side wall position of the base paper layer is overlapped and adhered to the exposed surface of the base paper layer, and the side wall edge of one side of the reverse surface oil hollowing layer overlaps and coincides with the side wall edge of the other side. The present invention realizes that the printing ink and coating varnish are avoided at the overlapping and coinciding position of the label, which is convenient for quickly adhering at the overlapping and coinciding position and avoids the situation of label dropping.

Description

Technical Field

[0001] The present invention relates to the field of label printing, and particularly to a reverse surface oil pasting position positioning and hollowing process label and a preparation method thereof. Background Art

[0002] Annular paper labels with UV varnishing on the surface are very likely to fall off on high-speed water-based glue labeling machines. For similar labels as long as there is UV varnishing, it is a relatively common problem that the water-based inkjet coding of the labels is prone to plate smudging.

[0003] For the new product reverse surface oil pasting position positioning and hollowing process label, the front side uses a UV reverse process printing layer, the middle carrier is 90-gram wet-strength coated paper, and the back side is the wet-strength base paper surface without any back coating treatment. When labeling, only need to wrap the fan-shaped paper label around the bottle body, and paste the two ends together with 6 mm positive and negative alignment.

[0004] Because the surface dyne value of the UV reverse layer on the front side is relatively low, the water-based labeling glue is not easy to quickly adhere on the high-speed labeling machine and is prone to falling off labels. There is an urgent need for a new process method to solve this problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a reverse surface oil pasting position positioning and hollowing process label and a preparation method thereof, so as to avoid printing ink and coating surface oil at the overlapping position of the labels, facilitate quick adhesion at this overlapping position, and avoid the situation of label falling off.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: A reverse surface oil pasting position positioning and hollowing process label, including a label body, the label body is sequentially laminated by a base paper basic layer, a UV ink printing and hollowing layer, a reverse bottom oil hollowing layer, and a reverse surface oil hollowing layer. One side of the base paper basic layer where the printing surface side wall is located is set in an exposed state. The distances between the UV ink printing and hollowing layer and the side wall edge of the base paper basic layer, the reverse bottom oil hollowing layer and the side wall edge of the base paper basic layer, and the reverse surface oil hollowing layer and the side wall edge of the base paper basic layer increase in sequence;

[0007] After the label body is wound one week, the side wall position of the other side back surface (non-printing surface) of the base paper basic layer abuts and adheres to the exposed printing surface position of the base paper basic layer, and the printing surface side wall edge of one side of the reverse surface oil hollowing layer overlaps and coincides with the side wall edge of the back surface of the other side.

[0008] A further setting of the present invention is that: the label body is fan-shaped. When the label body is curled and one side wall of the label body fits against the other side wall, the label body is in a frustum shape.

[0009] A further setting of the present invention is that the distance between the side edge of the UV ink printing hollow layer and the side edge of the base paper layer is 5 ± 0.5 mm; the distance between the side edge of the reverse base oil hollow layer and the side edge of the base paper layer is 5.5 ± 0.5 mm; the distance between the side edge of the reverse top oil hollow layer and the side edge of the base paper layer is 6 ± 0.5 mm.

[0010] A further setting of the present invention is that the material of the base paper layer is high wet strength coated paper.

[0011] A further setting of the present invention is a preparation method of a reverse top oil paste position positioning hollow process label, which has the following steps:

[0012] Step 1: Calculate the number of labels joined together on the printing layout, and divide the printing method into two types according to the number of joined labels. When the number of joined labels is greater than 20, precision hollow coating printing is selected; when the number of joined labels is less than 20, rubber blanket hollow coating printing is used.

[0013] Step 2: When the number of joined labels on the layout is greater than 20 and precision hollow coating printing is selected, typeset the label printing file required by the customer into a layout suitable for batch printing, and remove the solid color ink at the label paste covering position to achieve hollowing treatment, and produce a corresponding reverse coating top oil plate electronic file with a hollow position.

[0014] Step 3: Produce an electronic file for a laser exposure machine with accurately calculated hollow positions through the reverse coating top oil plate electronic file, load the aluminum-based flexographic plate into the laser exposure machine and fix it according to the parameters, which is convenient to adjust the hollow position of the aluminum-based flexographic plate, and expose it through the laser exposure machine to expose the flexographic photosensitive layer of the aluminum-based flexographic plate.

[0015] Step 4: Rinse the aluminum-based flexographic plate after exposure through a rinsing device, and the aluminum-based flexographic plate forms accurate hollow positions.

[0016] Step 5: The aluminum-based flexographic plate is curled and loaded into the coating drum, and labels are printed through the aluminum-based flexographic plate, and no ink adheres to the label paste position through the hollow positions. And during coating, the aluminum-based flexographic plate is radially stressed without tensile deformation.

[0017] Step 6: When the number of joined labels on the layout is less than or equal to 20 and the rubber blanket hollow coating method is selected, typeset the label printing file required by the customer into a layout suitable for batch printing, and remove the solid color ink at the label paste covering position to achieve hollowing treatment, and produce a corresponding reverse coating top oil plate electronic file with a hollow position.

[0018] Step 7: Produce an electronic document for the laser engraving machine with precisely calculated hollowing for the reverse coating varnish plate. Install the rubber blanket into the laser engraving machine and fix it according to the parameters, which facilitates adjusting the hollowing position of the rubber blanket. Then, engrave through the laser engraving machine to achieve that the laser engraving machine penetrates the rubber layer of the rubber blanket without damaging the base cloth layer, so as to form a hollowing position on the surface of the rubber blanket to avoid ink adhesion at the label pasting position.

[0019] Step 8: Install the engraved rubber blanket into the coating roller and adjust the tension of the rubber blanket to reduce the error during label printing. Through the hollowing position, no ink adheres to the label pasting position.

[0020] A further setting of the present invention is that the aluminum-based flexographic plate includes a base material layer, an intermediate layer, and a surface layer. The base material layer is made of aluminum alloy with a thickness of 0.32 ± 0.2 mm; the intermediate layer is an adhesive, a flexible material connecting the base material layer and the surface layer, with a thickness of 0.1 ± 0.01 mm; the surface layer is a flexible photosensitive material with a thickness of 0.6 ± 0.02 mm; and the total thickness of the aluminum-based flexographic plate is 10.2 ± 0.05 mm.

[0021] A further setting of the present invention is that the rubber blanket includes a base material layer, an intermediate layer, and a surface layer. The base material layer selects long-fiber cotton cloth with a thickness of 1.2 ± 0.05 mm as the skeleton material; the intermediate layer is an adhesive, connecting the base cloth and the rubber skin on the coating surface, with a thickness of 0.2 ± 0.05 mm; the surface layer is a natural rubber layer with a thickness of 0.6 ± 0.05. The layer structure of the rubber blanket is divided into three layers with a total thickness of 2 ± 0.15 mm.

[0022] In summary, the present invention has the following beneficial effects:

[0023] Through the above structure, it is ensured that the UV ink printing hollowing layer, the reverse bottom oil hollowing layer, and the reverse top oil hollowing layer shrink in sequence, and are in a hollow shape on the surface of the base paper layer facing the reverse top oil hollowing layer. When the label body curls one week and the back of the atomic base layer adheres to the floor position of the base paper layer, rapid adhesion is achieved through the glue, avoiding the influence of the existence of ink on the adhesion speed. Additionally, due to the differences in the distances between the UV ink printing hollowing layer, the reverse bottom oil hollowing layer, and the reverse top oil hollowing layer and the base paper layer, when there is a printing error, it can still be ensured that the UV ink printing hollowing layer, the reverse bottom oil hollowing layer, and the reverse top oil hollowing layer are arranged in sequence, and when the two sides of the label body adhere to each other, the unprinted base paper layer is not exposed, achieving no white line exposure (the place not covered by ink).

[0024] When the layout of the printing surface has more than 20 labels, due to the characteristic of the aluminum-based flexographic plate not generating tensile deformation, it is ensured that when in the surface hollowed-out state, it can still have a stable shape, improving the accuracy of coating and printing, and ensuring that after coating, the label forms hollowed-out positions where the ink and coating topcoat are not applied, so that at the edge position of one side of the printed label, the base paper layer 2 can be exposed; at the same time, ensuring the accuracy of the printed exposed position, ensuring that no white lines (uncoated areas) are exposed after the labels are overlapped and adhered. When the number of printed layout is less than or equal to 20, printing through steps 5 to 8 can effectively reduce the printing cost, and because there are fewer hollowed-out positions on the rubber cloth, it is ensured that the deformation amount is within the applicable range.

[0025] The base layer of the aluminum-based flexographic plate is a rigid material alloy aluminum, and the mechanical stretching error is very small. The flexographic plate is strongly adhered to the rigid base of the alloy aluminum and is not easily deformed radially or axially. Therefore, the accuracy of the coated hollowed-out position is very high. The coated transfer material preferably uses an imported aluminum-based flexographic plate to implement high-precision hollowed-out positions for high-end circular labels, high-precision positioning and spraying glue for packaging boxes, and high-definition water-based inkjet coding. Description of the Drawings

[0026] Figure 1 is a cross-sectional view of Embodiment 1;

[0027] Figure 2 is a schematic diagram when Embodiment 1 is unfolded;

[0028] Figure 3 is a schematic diagram when Embodiment 1 is wound and the side walls are overlapped and adhered.

[0029] The corresponding component names indicated by the numbers in the figure: 1. Label body; 2. Base paper layer; 3. UV ink printing hollowed-out layer; 4. Reverse bottom oil hollowed-out layer; 5. Reverse top oil hollowed-out layer. Detailed Embodiments

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0031] Embodiment 1: As Figures 1 to 3As shown in the figure, a reverse surface oil pasting position positioning hollowing process label proposed by the present invention includes a label body 1. The label body 1 is composed of a base paper layer 2, a UV ink printed hollowing layer 3, a reverse base oil hollowing layer 4, and a reverse surface oil hollowing layer 5 stacked in sequence, that is, the base paper layer 2 is located at the bottom. Among them, the base paper of the base paper layer 2 is a high wet strength coated paper with a basis weight of 90 ± 15 grams, a front side smoothness ≥ 900 s; a back side water absorption of 15 g / ㎡ ± 3; and a water content of 4.0% - 6.0%. The material of the UV ink printed hollowing layer is UV ink, and the overprint standard is ≤ 0.2 mm for the main part; ≤ 0.5 mm for the secondary part. The material of the reverse base oil hollowing layer 4 is a colorless special UV ink, which can be used as a UV reverse base oil. The material of the reverse surface oil hollowing layer 5 is a UV special reverse varnish.

[0032] One side of the base paper layer 2 at the side wall position of the printing surface is set in an exposed state, that is, the base paper layer 2 at this side position is not covered by the UV ink printed hollowing layer 3, the reverse base oil hollowing layer 4, and the reverse surface oil hollowing layer 5. The distance between the UV ink printed hollowing layer 3 and the side wall edge of the base paper layer 2, the distance between the reverse base oil hollowing layer 4 and the side wall edge of the base paper layer 2, and the distance between the reverse surface oil hollowing layer 5 and the side wall edge of the base paper layer 2 increase in sequence. In this embodiment, the distance between the UV ink printed hollowing layer 3 and the side wall edge of the base paper layer 2 is 5 ± 0.5 mm; the distance between the reverse base oil hollowing layer 4 and the side wall edge of the base paper layer 2 is 5.5 ± 0.5 mm; the distance between the reverse surface oil hollowing layer 5 and the side wall edge of the base paper layer 2 is 6 ± 0.5 mm. After the label body 1 is wound around once, the back side (non-printing surface) side wall position of the other side of the base paper layer 2 abuts and adheres to the exposed printing surface position of the base paper layer 2, and the side wall edges on one side of the reverse surface oil hollowing layer 5 coincide with the side wall edges on the other side.

[0033] Through the above structure, it is ensured that the UV ink printed hollowing layer 3, the reverse base oil hollowing layer 4, and the reverse surface oil hollowing layer 5 shrink in sequence, and are in a hollow state on the surface of the base paper layer 2 facing the reverse surface oil hollowing layer 5. When the label body 1 is curled once and the back surface of the atomic base layer adheres to the floor surface position of the base paper layer 2, rapid adhesion is achieved through glue, avoiding the influence of the existence of ink on the adhesion speed. In addition, through the difference in the distances between the UV ink printed hollowing layer 3, the reverse base oil hollowing layer 4, the reverse surface oil hollowing layer 5 and the base paper layer 2, when there is a printing error, it can still ensure that the UV ink printed hollowing layer 3, the reverse base oil hollowing layer 4, and the reverse surface oil hollowing layer 5 are arranged in sequence, and avoid the exposure of the base paper layer 2 that has not been printed after the two side edges of the label body 1 are adhered to each other, achieving no white line exposure (the place not covered by ink).

[0034] In this embodiment, the label body 1 can be selectively arranged in a fan shape. When the label body 1 is curled and one side wall of the label body 1 fits against the other side wall, the label body 1 is arranged in a frustum shape. This enables the label body 1 to adapt to being attached to the bottleneck position and the shape of the bottleneck.

[0035] Embodiment 2, a method for preparing a reverse surface oil pasting position positioning and hollowing process label, comprising the following steps:

[0036] Step 1: First, perform typesetting calculations on the label, calculate the number of labels joined together on the printing typesetting layout, and divide the printing method into two types according to the number of joined labels. When the number of joined labels is greater than 20, precise hollowing coating printing is selected; when the number of joined labels is less than 20, rubber blanket hollowing coating printing is used.

[0037] Step 2: When the number of joined labels on the layout is greater than 20 and precise hollowing coating printing is selected, typeset the label printing file required by the customer into a layout suitable for batch printing, and remove the solid-color ink at the label pasting and covering position to achieve hollowing treatment. According to the number, size, and angle of the ink hollowing positions on the combined printing layout, produce a corresponding reverse coating surface oil plate electronic file with hollowing positions.

[0038] Step 3: Produce an electronic file for the laser exposure machine with precisely calculated hollowing positions from the reverse coating surface oil plate electronic file, and synchronously input it into the laser exposure machine. Fix the aluminum-based flexible plate with hollowing positions on the laser exposure machine according to the parameters to facilitate adjusting the hollowing position of the aluminum-based flexible plate, and adjust the laser voltage to just penetrate the flexographic photosensitive layer.

[0039] Step 4: After the overall exposure is completed, place the aluminum-based flexible plate in the automatic rinsing equipment. The hollowed and exposed part is rinsed clean by water to become a precise hollowing position, achieving a small physical error and a very small mechanical stretching error for the hollowing position; and what is washed out after laser exposure is just like a thickened printing PS plate.

[0040] Step 5: The aluminum-based flexographic plate is curled and loaded into the coating cylinder. There is a difference in thickness between the aluminum-based flexographic plate and the printing blanket. It is necessary to increase the wrapping thickness of the aluminum-based flexographic plate to ensure the same pressure as the original blanket, so as to ensure the uniformity and stability of the reverse varnish coating. The aluminum-based flexographic plate is firmly clamped on the coating cylinder according to the set parameters in the same way as installing the blanket, so as to accurately coat the reverse varnish with the hollow position. Then, labels are printed through the aluminum-based flexographic plate, and there is no varnish adhesion at the label pasting position through the hollow position. During coating, the aluminum-based flexographic plate is stressed radially without tensile deformation. The aluminum-based flexographic plate will not have obvious stretching due to wrapping the coating cylinder, so the error of the hollow position will be maintained within ±0.5 mm. The aluminum-based flexographic plate is a precise preparation method for the reverse varnish pasting position positioning hollow process label, which completely improves the registration accuracy of the reverse varnish hollow position and solves the problem of local smudging of water-based glue labeling and water-based inkjet coding at the same time.

[0041] Step 6: When the layout of the printing plate is less than or equal to 20 joints and the method of hollow coating on the blanket is selected, the label printing file required by the customer is typeset into a layout suitable for batch printing, and the solid ink at the label pasting and covering position is removed to achieve hollowing treatment, and the electronic file of the reverse coating varnish plate with the hollow position is produced accordingly.

[0042] Step 7: An electronic file for the laser engraving machine with accurately calculated hollow positions is produced through the electronic file of the reverse coating varnish plate in Step 6. The blanket is loaded into the laser engraving machine and fixed according to the parameters to adjust the hollow position of the blanket, and then engraving is carried out through the laser engraving machine, so that the laser engraving machine penetrates the rubber layer of the blanket without damaging the base cloth layer, and hollow positions are formed on the surface of the blanket to avoid ink adhesion at the label pasting position. And due to the small number of joints in the layout of the printing plate and few hollow positions, when the blanket is stretched, excessive deformation is avoided.

[0043] Step 8: The engraved blanket is loaded into the coating cylinder, and the tension of the blanket is adjusted. It needs to be wrapped and tightened circumferentially to be able to coat the varnish normally. When the blanket is tightened on the coating station, the circumferential blanket will have a certain amount of stretching, and the axial blanket will have a certain amount of inward contraction. When the whole surface of the blanket is coated with varnish, it is not obvious that the varnish shifts; once there are hollow positions on the blanket, whether it is the error caused by manual engraving plus the mechanical stretching error of the blanket, the superposition will be within ±4 mm; for laser engraving, basically the mechanical stretching of the blanket will be within ±2.5 mm.

[0044] Among them, the aluminum-based flexographic plate used in steps 2 to 5 includes a substrate layer, an intermediate layer, and a surface layer. The substrate layer is made of alloy aluminum with a thickness of 0.32 ± 0.2 mm; the intermediate layer is an adhesive, a flexible material connecting the substrate layer and the surface layer, with a thickness of 0.1 ± 0.01 mm; the surface layer is a flexible photosensitive material with a thickness of 0.6 ± 0.02 mm; and the total thickness of the aluminum-based flexographic plate is 10.2 ± 0.05 mm. The substrate layer is a rigid material, alloy aluminum, with a very small mechanical stretching error. The flexographic plate is strongly adhered to the rigid base of the alloy aluminum and is not prone to radial or axial deformation. Therefore, the accuracy of the coated hollow position will be very high. It is preferred to use an imported aluminum-based flexographic plate for the transfer material, and implement high-precision hollow positions for high-end annular labels, high-precision positioning and spraying glue forming for packaging boxes, and high-definition and complete water-based inkjet coding.

[0045] The blanket used in steps 6 to 8 includes a substrate layer, an intermediate layer, and a surface layer. The substrate layer uses long-flannelette cotton cloth with a thickness of 1.2 ± 0.05 mm as the skeleton material; the intermediate layer is an adhesive, connecting the base cloth and the rubber skin on the coated surface, with a thickness of 0.2 ± 0.05 mm; the surface layer is a natural rubber layer with a thickness of 0.6 ± 0.05. The layer structure of the blanket is divided into three layers with a total thickness of 2 ± 0.15 mm.

[0046] In steps 2 to 5, due to the characteristic that the aluminum-based flexographic plate does not produce tensile deformation, it is ensured that when the surface layer is in a hollow state, it can still maintain a stable shape, improve the accuracy of coating and printing, and ensure that there are hollow positions on the coated label where the ink is not applied, so that on one side edge position of the printed label, the base paper layer 2 can be exposed; at the same time, ensure the accuracy of the printed exposed position, and ensure that there is no white line (where the ink is not covered) exposed after the labels are overlapped and adhered. When the number of printed layout is less than or equal to 20, printing through steps 5 to 8 can effectively reduce the printing cost, and since there are fewer hollow positions on the rubber cloth, ensure that the deformation amount is within the applicable range.

[0047] In this article, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of clearly expressing the technical solution and description, so it cannot be understood as a limitation to the present invention.

[0048] In this article, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including the listed elements, it may also include other elements not specifically listed.

[0049] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A reverse surface oil paste position positioning hollowing process label, characterized in that: It includes a label body (1), and the label body (1) is formed by sequentially laminating a base paper layer (2), a UV ink printed hollow layer (3), a reverse base oil hollow layer (4), and a reverse top oil hollow layer (5). The printing surface on one side wall position of the base paper layer (2) is set to be exposed. The distances between the UV ink printed hollow layer (3) and the side wall edge of the printing surface of the base paper layer (2), the reverse base oil hollow layer (4) and the side wall edge of the printing surface of the base paper layer (2), and the reverse top oil hollow layer (5) and the side wall edge of the printing surface of the base paper layer (2) increase in sequence. After the label body (1) is wound for one week, the back side wall position of the other side of the base paper layer (2) abuts and adheres to the exposed surface position of the printing surface of the base paper layer (2), and the side wall edge of the printing surface of the reverse top oil hollow layer (5) overlaps with the side wall edge of the other back side.

2. The reverse face oil paste position positioning hollowing process label according to claim 1, characterized in that: The label body (1) is fan-shaped. When the label body (1) is curled and the side wall of the printing surface of the label body (1) fits the side wall of the other back side, the label body (1) is frustum-shaped.

3. A reverse surface oil paste position positioning hollowing process label according to claim 1, characterized in that: The distance between the UV ink printed hollow layer (3) and the side wall edge of the base paper layer (2) is 5 ± 0.5 mm; the distance between the reverse base oil hollow layer (4) and the side wall edge of the base paper layer (2) is 5.5 ± 0.5 mm; the distance between the reverse top oil hollow layer (5) and the side wall edge of the base paper layer (2) is 6 ± 0.5 mm.

4. A reverse surface oil paste position positioning hollowing process label according to claim 1, characterized in that: The material of the base paper layer (2) is high wet strength coated paper.

5. A method for preparing a reverse surface oil paste position positioning hollow process label as described in any one of claims 1-4, characterized in that, It has the following steps: Step 1: Calculate the number of labels joined together on the printing layout, and divide the printing method into two types according to the number of joined labels. When the number of joined labels is greater than 20, precision hollow coating printing is selected; when the number of joined labels is less than 20, rubber blanket hollow coating printing is used. Step 2: When the number of joined labels on the layout is greater than 20 and precision hollow coating printing is selected, typeset the label printing file required by the customer into a layout suitable for batch printing, and remove the solid color ink at the label pasting and covering positions to achieve hollowing treatment, and produce a corresponding reverse coated top oil plate electronic file with hollow positions. Step 3: Produce an electronic file with precisely calculated hollow positions for a laser exposure machine through the reverse coated top oil plate electronic file, install the aluminum-based flexographic plate into the laser exposure machine and fix it according to the parameters, adjust the hollow position of the aluminum-based flexographic plate, and expose it through the laser exposure machine to expose the flexographic photosensitive layer of the aluminum-based flexographic plate. Step 4: Wash the aluminum-based flexographic plate after exposure through a washing device, and the aluminum-based flexographic plate forms precise hollow positions. Step 5: The aluminum-based flexographic plate is curled and installed into a coating roller, and labels are printed through the aluminum-based flexographic plate. The label pasting positions have no ink adhesion through the hollow positions, and during coating, the aluminum-based flexographic plate is radially stressed without tensile deformation. Step 6: When the layout of the sheet-fed printing is less than or equal to 20-up and the method of hollow coating on the blanket is selected, typeset the label printing file required by the customer into a layout suitable for batch printing, and cut out the solid-color ink at the label pasting and covering position to achieve hollowing treatment, and produce the corresponding reverse-coated varnish plate electronic file with a hollow position. Step 7: Produce an electronic file for the laser engraving machine from the reverse-coated varnish plate electronic file with the hollow position accurately calculated. Install the blanket into the laser engraving machine and fix it according to the parameters to adjust the hollow position of the blanket, and then engrave it through the laser engraving machine, so that the laser engraving machine penetrates the rubber layer of the blanket without damaging the base cloth layer, and form a hollow position on the surface layer of the blanket to avoid ink adhesion at the label pasting position. Step 8: Install the engraved blanket into the coating cylinder and adjust the tension of the blanket to reduce the error during label printing, so that no ink adheres to the label pasting position through the hollow position.

6. The preparation method of a reverse surface oil pasting position positioning hollowed-out process label according to claim 5, characterized in that, The aluminum-based flexographic plate includes a substrate layer, an intermediate layer, and a surface layer. The substrate layer is made of alloy aluminum with a thickness of 0.32 ± 0.2 mm; the intermediate layer is an adhesive, a flexible material connecting the substrate layer and the surface layer, with a thickness of 0.1 ± 0.01 mm; the surface layer is a flexible photosensitive material with a thickness of 0.6 ± 0.02 mm; and the total thickness of the aluminum-based flexographic plate is 10.2 ± 0.05 mm.

7. The preparation method of a reverse surface oil pasting position positioning hollow process label according to claim 5, characterized in that The blanket includes a substrate layer, an intermediate layer, and a surface layer. The substrate layer uses long-flannel cotton cloth with a thickness of 1.2 ± 0.05 mm as the skeleton material. The intermediate layer is an adhesive connecting the base cloth and the rubber skin on the coating surface, with a thickness of 0.2 ± 0.05 mm; the surface layer is a natural rubber layer with a thickness of 0.6 ± 0.05 mm. The layer structure of the blanket is divided into three layers with a total thickness of 2 ± 0.15 mm.

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