Improved Synchronous Pattern Alignment Embossing System and Embossing Method

Abstract

The present invention discloses an improved synchronous pattern alignment embossing system, which includes an embossing machine and a plate to be embossed. The embossing machine includes a frame, an upper pressing plate, a lower pressing plate, and guide rails. The upper pressing plate is connected to the top of the frame through a downward pressing driving device. The lower pressing plate is arranged in the middle of the frame. The bottom of the frame is provided with rollers matching the guide rails. It also includes a frame driving device for driving the frame to move on the guide rails. The upper pressing plate is provided with concave and convex patterns corresponding to the surface pattern of the plate to be embossed on the side facing the lower pressing plate. The width of the upper pressing plate is equal to or slightly wider than the width of the plate. The lower pressing plate has the same size as or a size slightly larger than the upper pressing plate. It also includes at least two groups of flattening pressing wheels, and the plate to be embossed passes through the middle of the two rollers of each group of flattening pressing wheels. An improved synchronous pattern alignment embossing method is also disclosed. The present invention can form clear and stable patterns on the surface of the plate and achieve precise alignment of the pattern and the concave and convex patterns.

Description

Technical Field

[0001] The invention relates to an improved synchronous pattern embossing system and an improved synchronous pattern embossing method. Background Art

[0002] Synchronous patterning has always been a difficult problem in the production of plastic sheets. Synchronous patterning technology can form a concave and convex pattern on the surface of the sheet that matches the pattern, making the pattern more three-dimensional and realistic. The current synchronous patterning technology is mainly achieved by multi-roll calendering. During the production process, it is easy for the substrate and the printed film to be out of sync, causing the substrate and the printed film to be misaligned, not only blurring the pattern, but also mismatching the pattern with the concave and convex pattern, which seriously affects the appearance of the sheet.

[0003] US Patent Document US10384427B2 discloses a plastic floor with printed patterns, in which the concave and convex patterns are pressed onto the surface of the plastic floor by a pattern roller, and the matching procedure between the printing layer and the substrate is adjusted by a registration transfer system. The disadvantages of this method are: 1. The contact time between the pattern roller and the floor is extremely short, resulting in insufficient indentation depth, easy deformation, and easy blurring. Taking a pattern roller with a diameter of 450mm as an example, the diameter of the pattern roller when it rotates one circle is: 0.45*3.14=1.413m. If the moving speed of the floor is 1.8m / min, then 1.8 / 1.413=1.27, 1.27*360°=460°, that is, the pattern roller rotates 1.27 circles per minute, equivalent to 460 degrees, 60s / 460=0.13s, that is, the time each position of the plastic floor contacts the pattern roller is only 0.13s. 2. The pattern and the pattern deviate. Although the speed difference between the printing layer and the substrate layer can be adjusted by increasing the temperature in this application, the printing layer is a very thin plastic film. During the lamination process, the printing layer 12 is conveyed by the first pressing roller 25 and the feed roller 31. During this process, the printing layer will be stretched to become longer and narrower, thereby causing deformation in both length and width. Even if the registration transfer system can adjust the deviation in length, the deviation in width cannot be avoided. Therefore, the final product will have a deviation in pattern and design, especially on both sides of the plate, where the deviation is serious. Summary of the invention

[0004] The object of the present invention is to provide an improved synchronous pattern embossing system which can form clear concave and convex patterns on a plate.

[0005] The technical solution adopted by the present invention is as follows: an improved synchronous pattern alignment embossing system, including an embossing machine and a plate to be embossed. The embossing machine includes a frame, an upper pressure plate, a lower pressure plate, and guide rails. The upper pressure plate is connected to the top of the frame through a downward pressure driving device. The lower pressure plate is arranged in the middle of the frame. The bottom of the frame is provided with rollers matching the guide rails. It also includes a frame driving device for driving the frame to move on the guide rails. The upper pressure plate is provided with concave-convex patterns corresponding to the surface patterns of the plate to be embossed on the side facing the lower pressure plate. The width of the upper pressure plate is equal to or slightly wider than the width of the plate. The lower pressure plate has the same size as or slightly larger size than the upper pressure plate. It is characterized in that: it also includes at least two groups of flattening pressure wheels. Each group of flattening pressure wheels includes two rollers rotating in opposite directions. At least one group of flattening pressure wheels is arranged at the front end of the frame, and at least one group is arranged at the rear end of the frame. The plate to be embossed passes through the middle of the two rollers of each group of flattening pressure wheels.

[0006] Preferably, the embossing machine further includes an image recognition system and a control system. The image recognition system is arranged in front of the frame on the feeding side of the embossing machine. The pre-printed pattern on the plate to be embossed is a repeated unit design. The concave-convex pattern on the upper pressure plate corresponds to n pattern units. The unit pattern is sent to the image recognition system. The image recognition system is used to scan the pattern on the plate to be embossed and compare it with the pre-stored unit pattern. When the matching degree between the pattern on the plate and the pre-stored unit pattern reaches at least 1 / 4, and the starting position of the pattern on the plate is aligned with the edge of the upper pressure plate, a signal is sent to the control system. After receiving the signal from the image recognition system, the control system controls the downward pressure driving device to drive the upper pressure plate to press down, and at the same time the frame moves at the same speed as the plate. After the frame moves along with the plate for the length of n pattern units, the control system controls the downward pressure driving device to drive the upper pressure plate to lift, and the frame driving device drives the frame to reset, where n is a natural number greater than or equal to 1.

[0007] The downward pressure driving device can be selected from a hydraulic driving device, a pneumatic driving device or an electric motor driving device, or other driving devices can also be used.

[0008] The frame driving device can be selected from a hydraulic driving device, a pneumatic driving device or an electric motor driving device, or other driving devices can also be used.

[0009] Preferably, the length of the guide rail ≥ 2 * the length of the frame.

[0010] Preferably, it further includes a heating device for heating the upper pressure plate.

[0011] Preferably, the image recognition system is fixedly arranged on the embossing machine and communicates with the control system by wired or wireless means.

[0012] Preferably, the image recognition system is separately arranged from the embossing machine and exchanges signals with the control system in a wired or wireless manner.

[0013] Preferably, it further includes a deviation correction device arranged on the lower platen. The image recognition system is located in the middle above the frame on the feeding side of the embossing machine. A center line mark is provided on the center line of the position where the plate to be embossed starts at each unit. The center line position of the frame is pre-entered in the image recognition system. The image recognition system sends the signals of the center line position of the frame and the center line mark to the control system. The control system compares the center line mark with the center line position of the frame. If the center line position of the frame deviates from the center line mark, it controls the deviation correction device to push the plate to be embossed to a position where the center line mark and the center line position of the frame are basically coincident.

[0014] Preferably, the deviation correction device is two symmetrically arranged hydraulic push rods, which are controlled by the control system and are respectively arranged on both sides of the lower platen surface close to the feeding direction of the embossing machine.

[0015] The present invention also discloses an improved synchronous pattern alignment embossing method, and its steps include:

[0016] A. Cover a printing layer, or a printing layer and a wear-resistant layer on the surface of the plate. Multiple repeated pattern units are printed on the printing layer. A feature mark is provided at the starting position of every n pattern units, where n is a natural number greater than or equal to 1;

[0017] B. The plate passes through the middle of the two rollers of each group of flattening rollers. The two rollers of each group of flattening rollers rotate in opposite directions to make the plate in an extended state;

[0018] C. The upper platen is provided with concave and convex patterns corresponding to the pattern units. The plate moves between the upper and lower platens. The unit pattern is transported into the image recognition system. The image recognition system scans the pattern on the plate to be embossed and compares it with the pre-stored unit pattern. When the matching degree between the pattern on the plate and the pre-stored unit pattern reaches at least 1 / 4, and the starting position of the pattern on the plate is aligned with the edge of the upper platen, it controls the upper platen to press down, and at the same time, the rollers of the flattening rollers stop rotating. The upper and lower platens apply pressure to the plate, so that the concave and convex patterns on the upper platen are transferred to the surface of the plate. When the upper and lower platens apply pressure to the plate, they move together with the plate;

[0019] D. After moving a distance of at least n pattern units, the upper platen is lifted, and at the same time, the upper and lower platens are reset, and the rollers of the flattening rollers start to rotate;

[0020] E. Repeat steps B-D until the embossing of the entire plate is completed.

[0021] Preferably, the moving speed of the plate is 1.0 - 15.0 m / min, and the reset speed of the upper and lower platens ≥ 10 m / s.

[0022] Preferably, the distance that the upper and lower pressing plates move along with the sheet is n pattern units in step c.

[0023] Preferably, when the moving speed of the sheet is less than or equal to 8 m / min, n = 1; when the moving speed of the sheet is greater than 8 m / min, n = 2. When the moving speed of the sheet is greater than 8 m / min, if n = 1, the holding pressure time for clamping the sheet between the upper and lower pressing plates is short and the indentation is shallow, which affects the quality of the sheet product. Therefore, the size of the upper and lower pressing plates is set to 2 times the unit pattern of the sheet, which can give a longer holding pressure time and improve the quality of the sheet product. Of course, the moving speed of the sheet can also be set higher, for example, greater than 15 m / min, and the size of the upper and lower pressing plates is set to 3 times or even 4 times the unit pattern of the sheet. However, in current actual production, if the upper and lower pressing plates are too large, the volume of the machine frame will be huge, the required site will be huge, the moving speed will be limited, and the energy consumption will be high. Under the current production conditions, the practicality is low. However, it can still solve the technical problems claimed in the present invention, and with the development of technology, it is possible that the huge machine frame becomes the norm in this field. Therefore, the solution with a higher moving speed of the sheet is still within the protection scope of the present invention.

[0024] Preferably, the sheet is a plastic sheet, a stone plastic sheet or a wood plastic sheet.

[0025] Preferably, the temperature of the sheet before entering the upper and lower pressing plates is controlled between 110 - 130 °C; the upper pressing plate is at room temperature when pressing the sheet, or the temperature of the upper pressing plate when pressing the sheet is controlled between 110 - 142 °C.

[0026] The present invention also discloses a synchronous pattern - matching sheet, including a sheet body, a printing layer is provided on the sheet body, and repetitive unit - designed patterns are pre - printed on the surface of the printing layer. It is characterized in that: the surface of the sheet has concave - convex patterns corresponding to the patterns formed by an embossing method.

[0027] Preferably, the embossing method refers to engraving concave - convex patterns corresponding to the pattern units on the pressing plate, and then pressing the sheet with the pressing plate to form concave - convex patterns corresponding to the patterns on the surface of the sheet.

[0028] Preferably, the embossing method refers to the above - mentioned method.

[0029] The present invention completes synchronous pattern - matching through the method of first coating patterns on the sheet or covering a printing layer with printed patterns and then embossing. Compared with the traditional process, it has the following advantages.

[0030] First, the embossing time is long. Taking the plate moving speed of 1.8m / min and a cycle of 1.413m as an example, the time for the upper and lower pressing plates to press the plate is (1.413 / 1.8)*60=47s, which means that each part of the plate is pressed for up to 47s, which can form a clear and stable indentation.

[0031] Second, the pattern and the concave and convex pattern can accurately correspond, and the produced board has a high degree of simulation and is more beautiful.

[0032] Third, the stamping process is a continuous online process, which can be used in conjunction with the continuous production process of the plate to directly produce a plate with a surface pattern and pattern. The present invention first sets the pattern on the plate, and then after the image recognition control system recognizes the characteristic mark, it commands the upper press to press down, so as to achieve precise alignment of the pattern and the concave and convex pattern.

[0033] Fourth, the resin sheet is easy to deform at a high temperature, and the surface is uneven, which affects the matching of the sheet pattern with the upper press pattern. The flattening wheel can make the sheet surface smooth, improve the matching degree between the sheet pattern and the upper press pattern, and improve the quality of the sheet.

[0034] Fifth, the resin sheet is easy to deform at a high temperature, and the surface is uneven, especially when the sheet is in motion, the deformation is more obvious. If point alignment is used, it will cause a certain error between the sheet pattern and the upper press pattern, affecting the quality of the finished product. The present invention uses surface line scanning, which helps to improve the matching degree between the sheet pattern and the upper press pattern and improve the quality of the finished product.

[0035] When stamping, keep the plate at a certain temperature. When the upper and lower pressing plates are at room temperature, cold pressing will make the texture on the plate clearer; if the upper pressing plate is heated, hot pressing will help make the texture on the plate deeper. Cold pressing or hot pressing can be selected according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic structural diagram of the improved synchronous pattern embossing system of Example 1.

[0037] Figure 2 This is a schematic diagram of the structure of the stamping machine of Example 1.

[0038] Figure 3 Another schematic diagram of the structure of the stamping machine of Example 1, in which the upper press is raised.

[0039] Figure 4 It is a front view of the improved synchronous pattern embossing system of Example 1.

[0040] Figure 5 This is a schematic structural diagram of the improved synchronous pattern embossing system of Example 2.

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Specific Embodiments

[0042] Embodiment 1

[0043] As Figures 1-4 shown, the improved synchronous pattern alignment and embossing system includes an embossing machine and a sheet 100 to be embossed, and is characterized in that: the embossing machine includes a frame 1, an upper pressing plate 2, a lower pressing plate 3, and guide rails 4. The upper pressing plate is connected to the top of the frame through a downward pressing driving device 5. The lower pressing plate is arranged in the middle of the frame. The bottom of the frame is provided with rollers 6 matching the guide rails. The length of the guide rails ≥ 2 * the length of the frame. It further includes a frame driving device (not shown in the figure) for driving the frame to move on the guide rails. The upper pressing plate is provided with concave and convex patterns corresponding to the surface patterns of the sheet to be embossed on the side facing the lower pressing plate. The width of the upper pressing plate is equal to or slightly wider than the width of the sheet. The lower pressing plate has the same size as or slightly larger size than the upper pressing plate. It also includes at least two groups of flattening pressing wheels. Each group of flattening pressing wheels includes two rollers 7 rotating in opposite directions. At least one group of flattening pressing wheels is arranged at the front end of the frame, and at least one group is arranged at the rear end of the frame. The sheet to be embossed passes through the middle of the two rollers of each group of flattening pressing wheels.

[0044] The embossing machine further includes an image recognition system 8 and a control system (not shown in the figure). The image recognition system is arranged in front of the frame on the feeding side of the embossing machine. The pre-printed pattern on the sheet to be embossed is a repeated unit design. The concave and convex patterns on the upper pressing plate correspond to n pattern units. The unit pattern is sent to the image recognition system. The image recognition system is used to scan the pattern on the sheet to be embossed and compare it with the pre-stored unit pattern. When the matching degree between the pattern on the sheet and the pre-stored unit pattern reaches at least 1 / 4, and the starting position of the pattern on the sheet is aligned with the edge of the upper pressing plate, a signal is sent to the control system. After receiving the signal from the image recognition system, the control system controls the downward pressing driving device to drive the upper pressing plate to press down, and at the same time the frame moves at the same speed as the sheet. After the frame follows the sheet and moves a length of n pattern units, the control system controls the downward pressing driving device to drive the upper pressing plate to lift, and the frame driving device drives the frame to reset, where n is a natural number greater than or equal to 1.

[0045] The downward pressing driving device can be selected from a hydraulic driving device, a pneumatic driving device, or an electric motor driving device.

[0046] The frame driving device can be selected from an electric motor driving device, a hydraulic driving device, or a pneumatic driving device.

[0047] Embodiment 2

[0048] The structure of this embodiment is basically the same as that of Embodiment 1, except that the image recognition system 8 is independently arranged outside the frame, in the upper front of the frame on the feeding side, and exchanges signals with the control system in a wireless or wired manner. It also includes a deviation correction device arranged on the lower pressing plate. The deviation correction device is two symmetrically arranged hydraulic push rods 9, which are controlled by the control system and are respectively arranged on both sides of the lower pressing plate surface close to the feeding direction of the printing press. The middle line of the plate to be printed is provided with a middle line mark at the starting position of each unit. The middle line position of the frame is pre-entered in the image recognition system. The image recognition system sends the signals of the middle line position of the frame and the middle line mark to the control system. The control system compares the middle line mark with the middle line position of the frame. If the middle line mark is to the left of the middle line position of the frame, it controls the left hydraulic push rod to push the plate to be printed to a position where the middle line mark and the middle line position of the frame are basically coincident. If the middle line mark is to the right of the middle line position of the frame, it controls the right hydraulic push rod to push the plate to be printed to a position where the middle line mark and the middle line position of the frame are basically coincident.

[0049] Embodiment 3

[0050] The structure of this embodiment is basically the same as that of Embodiment 2, except that it further includes a heating device (not shown in the figure) for uniformly heating the upper pressing plate. Any conventional heating device can be used, such as electric heating or heat transfer oil heating.

[0051] Embodiment 4

[0052] This improved synchronous pattern printing system includes a printing press and a plate 100 to be printed. It is characterized in that: the printing press includes a frame 1, an upper pressing plate 2, a lower pressing plate 3, and guide rails 4. The upper pressing plate is connected to the top of the frame through a downward pressing drive device 5. The lower pressing plate is arranged in the middle of the frame. The bottom of the frame is provided with rollers 6 matching the guide rails. The length of the guide rails ≥ 2 * the length of the frame. It also includes a frame drive device (not shown in the figure) for driving the frame to move on the guide rails. The upper pressing plate is provided with concave and convex patterns corresponding to the surface patterns of the plate to be printed on the side facing the lower pressing plate. The width of the upper pressing plate is equal to or slightly wider than the width of the plate. The lower pressing plate has the same size as or slightly larger size than the upper pressing plate. It also includes at least two groups of flattening pressure wheels. Each group of flattening pressure wheels includes two rollers 7 rotating in opposite directions. At least one group of flattening pressure wheels is arranged at the front end of the frame, and at least one group is arranged at the rear end of the frame. The plate to be printed passes through the middle of the two rollers of each group of flattening pressure wheels.

[0053] During use, calculate in advance the time intervals for the upper pressing plate to press down and lift according to the length of the pattern unit of the sheet material and the moving speed of the sheet material. The sheet material to be embossed passes through the middle of the two rollers of each flattening press roller and moves at a certain speed. Control the time point for the first press-down of the upper pressing plate. The upper pressing plate presses down, and at the same time, the flattening press roller stops rotating. The upper and lower pressing plates apply pressure to the sheet material, so that the concave and convex patterns on the upper pressing plate are transferred to the surface of the sheet material. After moving the length of one or more pattern units, the upper pressing plate lifts, the flattening press roller starts to rotate, and at the same time, the upper and lower pressing plates reset, and continuous production is repeated.

[0054] Example 5

[0055] This synchronous pattern alignment embossing method includes the following steps:

[0056] A. Cover a printing layer on the surface of the sheet material. Multiple repeated pattern units are printed on the printing layer, and a feature mark is provided at the starting position of each pattern unit;

[0057] B. The sheet material passes through the middle of the two rollers of each flattening press roller. The two rollers of each flattening press roller rotate in opposite directions to keep the sheet material in an extended state;

[0058] C. The upper pressing plate is provided with concave and convex patterns corresponding to the pattern units. Control the temperature of the sheet material before entering the upper and lower pressing plates to be about 110°C. The sheet material moves between the upper and lower pressing plates at a speed of 1.0 m / min. The unit pattern is sent to the image recognition system. The image recognition system scans the pattern on the sheet material to be embossed and compares it with the pre-stored unit pattern. When the matching degree between the pattern on the sheet material and the pre-stored unit pattern reaches 1 / 4, and the starting position of the pattern on the sheet material is aligned with the edge of the upper pressing plate, then control the upper pressing plate to press down. The upper and lower pressing plates apply pressure to the sheet material, so that the concave and convex patterns on the upper pressing plate are transferred to the surface of the sheet material. The upper pressing plate uses a 600-ton press. When applying pressure, the upper pressing plate remains at normal temperature, and the upper and lower pressing plates move together with the sheet material while applying pressure to the sheet material;

[0059] D. After the upper and lower pressing plates move a distance of one pattern unit with the sheet material, the upper pressing plate lifts, and at the same time, the upper and lower pressing plates reset. The reset speed of the upper and lower pressing plates is 10 m / s, and the rollers of the flattening press roller start to rotate;

[0060] E. Repeat steps B-D until the embossing of the entire sheet material is completed.

[0061] The sheet material is a stone plastic board.

[0062] Example 6

[0063] This synchronous pattern alignment embossing method includes the following steps:

[0064] A. Cover a printing layer on the surface of the sheet material. Multiple repeated pattern units are printed on the printing layer, and a feature mark is provided at the starting position of each pattern unit;

[0065] B. The sheet passes through the middle of the two rollers of each flattening pressure wheel, and the two rollers of each flattening pressure wheel rotate in opposite directions, keeping the sheet in a stretched state;

[0066] C. The upper pressure plate is provided with concave and convex patterns corresponding to the pattern units. The temperature of the sheet before entering the upper and lower pressure plates is controlled at about 120°C. The sheet moves between the upper and lower pressure plates at a speed of 8 m / min. The unit pattern is sent to the image recognition system. The image recognition system scans the pattern on the sheet to be embossed and compares it with the pre-stored unit pattern. When the matching degree of the pattern on the sheet and the pre-stored unit pattern reaches 1 / 3, and the starting position of the pattern on the sheet is aligned with the edge of the upper pressure plate, the upper pressure plate is controlled to press down. The upper and lower pressure plates apply pressure to the sheet, so that the concave and convex patterns on the upper pressure plate are transferred to the surface of the sheet. The upper pressure plate uses an 800-ton press and is heated to about 110°C. The upper and lower pressure plates move together with the sheet while applying pressure to the sheet;

[0067] D. After the upper and lower pressure plates move a distance of one pattern unit with the sheet, the upper pressure plate rises, and at the same time, the upper and lower pressure plates reset. The reset speed of the upper and lower pressure plates is 12 m / s, and the rollers of the flattening pressure wheel start to rotate;

[0068] E. Repeat steps B-D until the embossing of the entire sheet is completed.

[0069] The sheet is a plastic sheet.

[0070] Example 7

[0071] The steps of this synchronous pattern alignment embossing method include:

[0072] A. A printing layer is covered on the surface of the sheet. Multiple repeated pattern units are printed on the printing layer, and feature marks are provided at the starting positions of every two pattern units;

[0073] B. The upper pressure plate is provided with concave and convex patterns corresponding to the pattern units. The temperature of the sheet before entering the upper and lower pressure plates is controlled at about 125°C. The sheet moves between the upper and lower pressure plates at a speed of 10 m / min. The unit pattern is sent to the image recognition system. The image recognition system scans the pattern on the sheet to be embossed and compares it with the pre-stored unit pattern. When the matching degree of the pattern on the sheet and the pre-stored unit pattern reaches 1 / 3, and the starting position of the pattern on the sheet is aligned with the edge of the upper pressure plate, the upper pressure plate is controlled to press down. The upper and lower pressure plates apply pressure to the sheet, so that the concave and convex patterns on the upper pressure plate are transferred to the surface of the sheet. The upper pressure plate uses a 1200-ton press and is heated to about 130°C. The upper and lower pressure plates move together with the sheet while applying pressure to the sheet;

[0074] C. After the upper and lower pressing plates move 2 pattern units along with the sheet material, the upper pressing plate is lifted, and at the same time, the upper and lower pressing plates are reset. The reset speed of the upper and lower pressing plates is 15 m / s;

[0075] D. Repeat steps B - C until the embossing of the entire sheet material is completed.

[0076] The sheet material is a stone plastic board.

[0077] Example 8

[0078] The steps of this synchronous pattern alignment embossing method include:

[0079] A. Cover a printing layer on the surface of the sheet material. Multiple repeated pattern units are printed on the printing layer, and feature marks are provided at the starting positions of every 2 pattern units;

[0080] B. The sheet material passes through the middle of the two rollers of each set of flattening rollers. The two rollers of each set of flattening rollers rotate in opposite directions to keep the sheet material in a stretched state;

[0081] C. The upper pressing plate is provided with concave - convex patterns corresponding to the pattern units. Control the temperature of the sheet material before entering the upper and lower pressing plates to be about 130 °C. The sheet material moves between the upper and lower pressing plates at a speed of 15.0 m / min. The unit pattern is sent into the image recognition system. The image recognition system scans the pattern on the sheet material to be embossed and compares it with the pre - stored unit pattern. When the matching degree between the pattern on the sheet material and the pre - stored unit pattern reaches 1 / 3, and the starting position of the pattern on the sheet material is aligned with the edge of the upper pressing plate, then control the upper pressing plate to press down. The upper and lower pressing plates apply pressure to the sheet material, so that the concave - convex patterns on the upper pressing plate are transferred to the surface of the sheet material. The upper pressing plate uses a 1400 - ton press, and the upper pressing plate is heated to about 142 °C. The upper and lower pressing plates move along with the sheet material while applying pressure to the sheet material;

[0082] D. After the upper and lower pressing plates move 2 pattern units along with the sheet material, the upper pressing plate is lifted, and at the same time, the upper and lower pressing plates are reset. The reset speed of the upper and lower pressing plates is 18 m / s, and the rollers of the flattening rollers start to rotate;

[0083] E. Repeat steps B - D until the embossing of the entire sheet material is completed.

[0084] The sheet material is a wood - plastic board.

[0085] Example 9

[0086] This example is basically the same as Example 5, the difference being that in step A, a printing layer and a wear - resistant layer are covered on the surface of the sheet material.

Claims

1. An improved synchronous pattern alignment embossing system, comprising an embossing machine and a plate to be embossed. The embossing machine includes a frame, an upper platen, a lower platen, and guide rails. The upper platen is connected to the top of the frame through a downward pressing drive device. The lower platen is arranged in the middle of the frame. The bottom of the frame is provided with rollers matching the guide rails. It further includes a frame drive device for driving the frame to move on the guide rails. The upper platen is provided with concave and convex patterns corresponding to the surface patterns of the plate to be embossed on the side facing the lower platen. The width of the upper platen is equal to or slightly wider than the width of the plate. The lower platen has the same size as or a size slightly larger than the upper platen. It further includes at least two groups of flattening pressure wheels. Each group of flattening pressure wheels includes two rollers rotating in opposite directions. At least one group of flattening pressure wheels is arranged at the front end of the frame, and at least one group is arranged at the rear end of the frame. The plate to be embossed passes through the middle of the two rollers of each group of flattening pressure wheels. The embossing machine further includes an image recognition system and a control system. The image recognition system is arranged in front of the frame on the feeding side of the embossing machine. The pre-printed pattern on the plate to be embossed is a repetitive unit design. The concave and convex patterns on the upper platen correspond to n pattern units. The unit pattern is sent to the image recognition system. The image recognition system is used to scan the pattern on the plate to be embossed and compare it with the pre-stored unit pattern. When the matching degree between the pattern on the plate and the pre-stored unit pattern reaches at least 1 / 4, and the starting position of the pattern on the plate is aligned with the edge of the upper platen, a signal is sent to the control system. After receiving the signal from the image recognition system, the control system controls the downward pressing drive device to drive the upper platen to press down, and at the same time, the frame moves at the same speed as the plate. After the frame moves along with the plate for the length of n pattern units, the control system controls the downward pressing drive device to drive the upper platen to lift, and the frame drive device drives the frame to reset. Here, n is a natural number greater than or equal to 1, and the length of the guide rails ≥ 2 * the length of the frame.

2. The improved synchronous pattern alignment embossing system according to claim 1, wherein: The described image recognition system is fixedly installed on the printing press and exchanges signals with the control system in a wired or wireless manner.

3. The improved synchronous pattern alignment embossing system according to claim 1, wherein: The described image recognition system is separately installed from the printing press and exchanges signals with the control system in a wired or wireless manner.

4. The improved synchronous pattern alignment embossing system according to claim 1, wherein: It further includes a deviation correction device arranged on the lower platen. A center line mark is provided on the center line of the position where the plate to be printed starts in each unit. The center line position of the frame is pre-recorded in the image recognition system. The image recognition system sends the signals of the center line position of the frame and the center line mark to the control system. The control system compares the center line mark with the center line position of the frame. If the center line position of the frame deviates from the center line mark, it controls the deviation correction device to push the plate to be printed to a position where the center line mark and the center line position of the frame are basically coincident.

5. The improved synchronous pattern alignment embossing system according to claim 1, wherein: It further includes a heating device, and the heating device is used to heat the upper platen.

6. An improved synchronous pattern alignment embossing method, which is completed by relying on the synchronous pattern alignment embossing system according to any one of claims 1-5. The steps include: A. Cover a printing layer, or a printing layer and a wear-resistant layer on the surface of the plate. Multiple repeated pattern units are printed on the printing layer, and a feature mark is provided at the starting position of every n pattern units, where n is a natural number greater than or equal to 1. B. The plate passes through the middle of the two rollers of each group of flattening rollers. The two rollers of each group of flattening rollers rotate in opposite directions to keep the plate in a stretched state. C. The upper platen is provided with concave and convex patterns corresponding to the pattern units. The plate moves between the upper and lower platens, and the unit pattern is conveyed into the image recognition system. The image recognition system scans the pattern on the plate to be printed and compares it with the pre-stored unit pattern. When the matching degree of the pattern on the plate and the pre-stored unit pattern reaches at least 1 / 4, and the starting position of the pattern on the plate is aligned with the edge of the upper platen, it controls the upper platen to press down, and at the same time, the rollers of the flattening rollers stop rotating. The upper and lower platens apply pressure to the plate, so that the concave and convex patterns on the upper platen are transferred to the surface of the plate. The upper and lower platens move along with the plate while applying pressure to the plate. D. After moving a distance of at least n pattern units, the upper platen lifts, and at the same time, the upper and lower platens return to their original positions, and the rollers of the flattening rollers start to rotate. E. Repeat steps B - D until the entire plate is printed.

7. The improved synchronous pattern alignment stamping method according to claim 6, characterized in that: The plate is a plastic plate, a stone plastic plate, or a wood plastic plate.

8. The improved synchronous pattern alignment stamping method according to claim 6, characterized in that: Control the temperature of the plate before entering the upper and lower platens to be between 110 - 130 °C; the upper platen is at room temperature when pressing the plate, or the temperature of the upper platen is controlled between 110 - 142 °C when pressing the plate.

9. The improved synchronous pattern alignment stamping method according to any one of claims 6-8, characterized in that: The moving speed of the plate is 1.0 - 15.0 m / min, and the return speed of the upper and lower platens ≥ 10 m / s.

10. The improved synchronous pattern alignment stamping method according to claim 9, characterized in that: When the moving speed of the plate is less than or equal to 8 m / min, n = 1; when the moving speed of the plate is greater than 8 m / min, n = 2.

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