Laser slitting processing system and dynamic slitting method of closed pattern

Abstract

This invention discloses a laser slitting system and a dynamic slitting method for closed shapes, aiming to provide a laser slitting system and a dynamic slitting method for closed shapes that can be achieved using fewer laser slitting units. The laser slitting system includes a fabric conveying unit, laser slitting units, and a controller. The dynamic slitting method for closed shapes includes the following steps: dividing the fabric on the fabric conveying unit into at least two slitting areas; determining the laser slitting path, with each laser slitting unit corresponding to one slitting area, and determining the laser slitting path of each laser slitting unit within its corresponding slitting area, the laser slitting paths of all laser slitting units collectively forming a closed shape; the fabric conveying unit driving the fabric along a straight line at a set speed, and each laser slitting unit cutting the fabric along the laser slitting path during the fabric movement.

Description

Technical Field

[0001] This invention relates to the field of fabric laser slitting technology, specifically to a laser slitting system and a multi-laser dynamic slitting method for closed patterns. Background Technology

[0002] Currently, laser slitting of fabrics (such as laser slitting of sanitary product fabrics) generally uses a static slitting process to slit closed shapes. Specifically, the fabric to be slit is laid flat on a fixed worktable; secondly, a laser slitting unit slits the static fabric on the worktable. When using this static slitting process, because the laser's slitting area is relatively small (generally 100-300 mm), multiple lasers are often needed to work together to slit the closed shape (each laser is responsible for a section of the cutting path); and the larger the area of ​​the closed shape, the more lasers are required.

[0003] The current technical challenge in laser fabric slitting for closed patterns lies in achieving high-precision line matching. The slitting patterns are difficult to align, leading to deviations and incomplete cuts. This is especially true when slitting large closed patterns, often requiring multiple lasers working in tandem. The larger the closed pattern, the more laser slitting units and lasers are needed, resulting in more intersections of the non-closed patterns cut by each laser. Furthermore, the overlap of the non-closed patterns at these intersections is difficult to align, leading to deviations and multiple areas of large closed patterns that cannot be completely cut.

[0004] On the other hand, the current fabric laser slitting process generally uses CO2 lasers. Although using this type of laser to slitting materials can achieve high processing efficiency, it is easy to generate a large heat-affected zone, resulting in a high degree of crystallization at the product slitting edges, poor tactile feel, and even easy to scratch the skin, making it difficult to meet the requirements of skin contact. Summary of the Invention

[0005] The primary objective of this invention is to provide a laser slitting system and a dynamic slitting method for closed graphics, which allows for the slitting of closed graphics using fewer laser slitting units.

[0006] The second objective of this invention is to provide a dynamic cutting method for closed graphics that ensures complete severing of closed graphics without any sticking of fibers.

[0007] The technical solution of this invention is: A laser slitting system, comprising: The fabric conveying unit maintains the shape of the fabric and drives the fabric to move in a straight line at a set speed. The laser slitting unit cuts the fabric moving at a set speed on the fabric conveying unit along a predetermined trajectory. The controller manages the operating parameters of the laser slitting system, including the operating parameters of the fabric conveying unit and the laser slitting unit. This laser slitting system can dynamically slit closed patterns in the fabric. Specifically... The fabric is held in shape by a fabric conveying unit and moved in a straight line at a set speed. A laser slitting unit then cuts the fabric along a predetermined trajectory on the conveying unit. Although the laser slitting unit has a fixed and small slitting width, the actual slitting width becomes a strip-shaped area because the fabric moves in a straight line at the set speed during the slitting process (equivalent to the fabric remaining stationary while the laser slitting unit moves in a straight line at the set speed). The length of this strip is parallel to the fabric's movement direction, effectively increasing the actual slitting width of the same laser slitting unit and enabling it to cut longer cutting paths (creating longer cutting paths in the fabric's movement direction). Therefore, this laser slitting system allows for the slitting of closed shapes using fewer laser slitting units; especially when the closed shape is long in the fabric's movement direction, it effectively reduces the number of laser slitting units required.

[0008] Preferably, a negative pressure device is also included to provide a negative pressure holding force to the fabric held on the surface of the fabric conveying unit, so as to keep the fabric moving in a set shape. In this way, the shape of the fabric on the surface of the fabric conveying unit can be maintained conveniently and stably, and the fabric can be kept under a certain tension, thereby avoiding changes in the shape of the fabric during the fabric cutting process, which would affect the normal cutting of the fabric.

[0009] Preferably, the fabric conveying unit uses a belt conveyor. The surface of the conveyor belt has several suction holes, and a negative pressure device is located within the loop formed by the conveyor belt. Thus, in actual operation, the fabric loading station can be set on the side of the conveyor belt near the input end. At the loading station, the fabric to be cut is laid on the surface of the conveyor belt in a predetermined shape at a certain frequency, and the negative pressure device provides negative pressure to keep the fabric on the conveyor belt surface. Then, the fabric is smoothly conveyed to the cutting station (located at the position corresponding to the laser slitting unit) while maintaining the predetermined shape. The laser slitting unit cuts the fabric on the conveying unit along a predetermined trajectory. After the laser slitting unit completes the fabric cutting, the fabric is directly output via the conveyor belt. This cycle repeats, achieving efficient cutting processing, thereby improving production efficiency and adapting to production rhythm requirements.

[0010] Preferably, a cleaning device is also included to remove impurities that remain on the surface of the fabric conveying unit during the slitting process. This allows the cleaning device to remove these impurities, facilitating the repeated conveying of fabric to be cut by the fabric conveying unit.

[0011] A dynamic slitting method for closed graphics using a laser slitting system includes the following steps: The fabric on the fabric conveying unit is divided into at least two cutting areas based on the closed shape and the effective processing area of ​​the laser cutting unit. Each cutting area is arranged sequentially along the direction perpendicular to the fabric movement. Determine the laser slicing path. Each laser slicing unit corresponds to a slicing area. Determine the laser slicing path of each laser slicing unit within the corresponding slicing area. The laser slicing paths of all laser slicing units together form a closed figure. The fabric conveying unit drives the fabric to move in a straight line at a set speed. During this movement, each laser cutting unit cuts the fabric along the laser cutting path. This scheme's dynamic cutting method for closed shapes employs multiple laser cutting units working collaboratively to cut large-area closed shapes. Since each cutting area is arranged sequentially perpendicular to the fabric's movement direction, each area extends along that direction. Thus, when each laser cutting unit corresponds to one cutting area (i.e., each laser cutting unit is responsible for one cutting area), although the set cutting width of each laser cutting unit is fixed and small, the actual cutting width of the laser cutting unit becomes a strip-shaped area. This strip-shaped area's length is parallel to the fabric's movement direction. In other words, the actual cutting area of ​​each laser cutting unit will extend along the corresponding cutting area, so that it can cover the laser cutting path in the corresponding cutting area, thereby effectively increasing the actual cutting area of ​​the same laser cutting unit and enabling the same laser cutting unit to cut a longer cutting path (cut a longer cutting path in the direction of fabric movement). Based on this, the dynamic cutting method of closed patterns in this solution is beneficial to use fewer laser cutting units to achieve the cutting processing of closed patterns; especially when the length of the closed pattern in the direction of fabric movement is long, it can effectively reduce the number of laser cutting units required.

[0012] Preferably, there are two laser slitting units, two slitting areas, and one laser slitting path in each slitting area. Each slitting area extends along the direction of fabric movement, and each laser slitting path in each slitting area is a continuous slitting path.

[0013] Preferably, there are three or more laser slitting units; there are three or more slitting areas, of which the two slitting areas at the ends each have one laser slitting path, and the remaining slitting areas each have two laser slitting paths. The two laser slitting paths within the same slitting area are arranged along the fabric movement direction, and each slitting area extends along the fabric movement direction. Each laser slitting path in each slitting area is a continuous slitting path. Compared to the existing static slitting process, where each laser can only handle one cutting path, this solution, through fabric movement, allows each laser slitting unit in each of the remaining slitting areas (excluding the two at the ends) to complete the cutting of two laser slitting paths, thereby further reducing the number of laser slitting units required.

[0014] Preferably, the laser slitting unit is set to a square with a side length of L. The actual slitting surface of the laser slitting unit during fabric movement is a strip-shaped surface with a width of L, and its length direction is parallel to the fabric movement direction. The laser slitting path of each slitting area falls within the actual slitting surface of the corresponding laser slitting unit. This ensures that the laser slitting unit can achieve laser slitting path cutting within the corresponding slitting area.

[0015] Preferably, each laser cutting path has overcutting paths at both ends, with one end being the starting overcutting path and the other end being the ending overcutting path. The end of the starting overcutting path is the starting point of the corresponding laser cutting path, and the end of the laser cutting path is the starting point of the corresponding ending overcutting path. Each overcutting path is located within a closed shape. During the fabric movement, each laser cutting unit cuts the fabric to be cut from the starting point of the starting overcutting path along the starting overcutting path, the corresponding laser cutting path, and the ending overcutting path until the end point of the corresponding ending overcutting path. In the dynamic cutting method of closed patterns in this scheme, an overcutting path is set at the connection endpoint of any two adjacent laser cutting paths, and the overcutting path is located in the waste area inside the closed pattern. In this way, on the one hand, it can prevent cutting the fabric body, and on the other hand, it can ensure that the non-closed pattern of each laser cutting unit is successfully cut at the predetermined intersection, thereby ensuring that the closed pattern is completely cut off without the phenomenon of sticking. This effectively solves the problem in the existing fabric laser cutting process that the cutting pattern is not easy to align, which easily leads to deviation and causes the closed pattern to not be completely cut off.

[0016] Preferably, the parameters for cutting the fabric by each laser slitting unit are as follows: laser wavelength of 0.8-20 micrometers, repetition frequency of 1-3MHz, and pulse width of less than 100ps. Through extensive research and development and numerous experiments, the inventors discovered that setting the following cutting parameters during fabric cutting—laser wavelength of 0.8-20 micrometers, repetition frequency of 1-3MHz, and pulse width of less than 100ps—effectively prevents crystallization at the fabric slitting edges, resulting in a better tactile feel at the cut surface, meeting the requirements for skin contact and ensuring slitting quality. This effectively solves the problem in existing fabric laser slitting processes using CO2 lasers that suffer from high crystallization at the slitting edges, poor tactile feel, and even skin scratches, making them unsuitable for skin contact.

[0017] The beneficial effects of this invention are: Firstly, it facilitates the use of fewer laser slitting units to achieve the slitting and processing of closed graphics.

[0018] Secondly, it can ensure that the closed pattern is completely cut off without any sticking; it effectively solves the problem in the existing fabric laser cutting process that the cutting pattern is not easy to align and is prone to deviation, resulting in the closed pattern not being completely cut off.

[0019] Thirdly, it can effectively prevent crystallization at the fabric cutting edges, making the cut surface feel good to the touch, so as to meet the requirements of skin contact and ensure the cutting quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a laser slitting system according to the present invention.

[0021] Figure 2 This is a schematic diagram illustrating the process of cutting fabric using the dynamic cutting method for closed graphics in specific embodiments two and three of the present invention.

[0022] Figure 3 This is a schematic diagram illustrating the process of cutting fabric using the dynamic cutting method of closed graphics in specific embodiments two and four of the present invention.

[0023] Figure 4 This is a schematic diagram of the process of cutting fabric using the dynamic cutting method of closed graphics in a specific embodiment of the present invention, specifically in the sixth embodiment.

[0024] In the picture: Fabric conveying unit 1, conveyor belt 1.1; Laser slitting unit 2; Negative pressure device 3, negative pressure box 3.1; Cleaning device 4, roller brush 4.1; 5 pieces of cloth; Segmentation area 6; Closed shape 7, laser cutting path 7.1; Starting point through tangent path 8; End point via tangent path 9. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Specific Implementation Example 1, such as Figure 1 As shown, a laser slitting system includes a fabric conveying unit 1, a laser slitting unit 2, and a controller.

[0026] The fabric conveying unit 1 maintains the shape of the fabric 5 and drives the fabric 5 to move in a straight line at a set speed.

[0027] The laser slitting unit 2 cuts the fabric 5, which moves at a set speed on the fabric conveying unit 1, along a predetermined trajectory. There may be one or more laser slitting units 2.

[0028] The controller controls the operating parameters of the laser slitting system. These operating parameters include those of the fabric conveying unit 1 and the laser slitting unit 2.

[0029] The laser slitting system of this embodiment can dynamically slit the closed shape 7 of the fabric 5. Specifically, the fabric conveying unit 1 maintains the shape of the fabric 5 and drives the fabric 5 to move in a straight line at a set speed. The laser slitting unit 2 slits the fabric 5, which is moving at a set speed on the fabric conveying unit 1, along a predetermined trajectory. Although the set slitting width of the laser slitting unit 2 is fixed and small, since the fabric 5 moves in a straight line at a set speed during the slitting process of the laser slitting unit 2 (equivalent to the fabric 5 remaining stationary while the laser slitting unit 2 moves in a straight line at a set speed), the actual slitting width of the laser slitting unit 2 becomes a strip-shaped width. The length direction of this strip-shaped width is parallel to the direction of movement of the fabric 5, thereby effectively increasing the actual slitting width of the same laser slitting unit 2 and enabling the same laser slitting unit 2 to cut a longer cutting path (cutting a longer cutting path in the direction of movement of the fabric 5). Based on this, the laser slitting system of this solution is advantageous in using fewer laser slitting units 2 to slitting the closed pattern 7; especially when the length of the closed pattern 7 in the direction of fabric 5 movement is long, it can effectively reduce the number of laser slitting units 2 required.

[0030] In this embodiment, the laser slicing unit 2 includes a picosecond pulsed laser, a beam expander, a field mirror, and a galvanometer. The laser slicing unit 2 is a prior art concept, and its specific structure is not the focus of this application. Therefore, this application will not elaborate on the specific methods and structures of the laser slicing unit 2 or other conventional technical means. In this embodiment, each laser slicing unit 2 also includes a cooling machine, which is used to cool the temperature of the picosecond pulsed laser during the slicing process to prevent damage to the laser due to overheating.

[0031] In this embodiment, as Figure 1 As shown, the fabric conveying unit 1 uses a belt conveyor. The belt conveyor includes a conveyor belt 1.1 and a conveyor motor that drives the conveyor belt 1.1. The upper surface of the conveyor belt 1.1 is horizontally distributed. Fabric 5 is laid on the upper surface of the conveyor belt 1.1, and the conveyor belt 1.1 drives the fabric 5 to maintain a set shape and move in a straight line. Thus, in actual operation, the fabric loading station can be set on the side of the conveyor belt near the input end. At the loading station, the fabric to be cut is laid on the upper surface of the conveyor belt in a set shape at a certain frequency. Then, the fabric is steadily conveyed to the cutting station (located at the position corresponding to the laser slitting unit) by the conveyor belt while maintaining the set shape. The laser slitting unit cuts the fabric on the fabric conveying unit along a predetermined trajectory. After the laser slitting unit completes the fabric cutting, the fabric is directly output through the conveyor belt. This cycle is repeated to achieve efficient cutting processing, thereby improving production efficiency and adapting to production cycle requirements.

[0032] It should be noted that using a belt conveyor for the fabric conveying unit 1 is only a preferred embodiment of this invention, and other solutions can also be used. For example, the fabric conveying unit 1 includes a horizontal track and a worktable that slides along the horizontal track, i.e., a translation drive mechanism that drives the worktable to move at a set speed. The translation drive mechanism can be an electric cylinder, a linear module, or other existing translation drive mechanisms available on the market. The worktable has a working plane, and the fabric 5 is laid on the working plane. The translation drive mechanism drives the worktable and the fabric 5 on it to maintain a set shape and move in a straight line.

[0033] Furthermore, such as Figure 1 As shown, a laser slitting system further includes a negative pressure device 3. The negative pressure device 3 provides a negative pressure holding force to the fabric 5 held on the surface of the fabric conveying unit 1, so that the fabric 5 maintains a set shape. In this way, the shape of the fabric on the surface of the fabric conveying unit can be easily and stably maintained, and the fabric can maintain a certain tension, thereby preventing changes in the fabric shape during the cutting process and affecting the normal cutting of the fabric. Specifically, The surface of the conveyor belt 1.1 is covered with a number of uniformly distributed adsorption holes. The negative pressure device 3 is located within the loop formed by the conveyor belt 1.1. The negative pressure device 3 includes a negative pressure box 3.1 extending along the direction of the conveyor belt 1.1 and a negative pressure pump for evacuating the inner cavity of the negative pressure box 3.1. The conveyor belt 1.1 includes an upper conveyor belt 1.1 and a lower conveyor belt 1.1. The negative pressure box 3.1 is located between the upper conveyor belt 1.1 and the lower conveyor belt 1.1.

[0034] In one example, the upper surface of the negative pressure box 3.1 is open, and the upper conveyor belt 1.1 covers the opening of the upper surface of the negative pressure box 3.1. In this way, the negative pressure inside the negative pressure box 3.1 can be applied to the fabric 5 through the adsorption holes on the surface of the conveyor belt 1.1, thereby smoothly conveying the fabric 5 through the conveyor belt 1.1 and keeping the fabric 5 in a set shape.

[0035] In another example, the upper surface of the negative pressure box 3.1 is provided with several evenly distributed openings, and the lower surface of the upper conveyor belt 1.1 is close to the upper surface of the negative pressure box 3.1. In this way, the negative pressure inside the negative pressure box 3.1 can be applied to the fabric 5 through the adsorption holes on the surface of the conveyor belt 1.1, thereby smoothly conveying the fabric 5 through the conveyor belt 1.1 and keeping the fabric 5 in a set shape.

[0036] Furthermore, such as Figure 1 As shown, a laser slitting system also includes a cleaning device 4. This device cleans impurities accumulated on the surface of the fabric conveying unit 1 during the slitting process. Thus, the cleaning device 4 removes these impurities, facilitating the repeated conveying of fabric 5 cut by the fabric conveying unit 1 via the conveyor belt 1.1. Specifically, the cleaning device 4 includes a rotating roller brush 4.1 and a roller motor that drives the roller brush 4.1 to rotate. The roller brush 4.1 is located below the conveyor belt 1.1, with its bristles pressed against the lower surface of the conveyor belt 1.1. Therefore, the roller motor drives the roller brush 4.1 to rotate, effectively cleaning the impurities accumulated on the surface of the conveyor belt 1.1.

[0037] Specific embodiment two: A dynamic cutting method for closed graphics using a laser cutting processing system. The specific structure of the laser cutting processing system in this method is as described in specific embodiment one.

[0038] like Figure 2 , Figure 3 As shown, a dynamic slitting method for closed graphics using a laser slitting system includes the following steps: The fabric 5 on the fabric conveying unit 1 is divided into at least two cutting regions 6 according to the closed pattern 7 and the set cutting width of the laser cutting unit 2. Each cutting region 6 is arranged sequentially along the direction of movement of the fabric 5. Each cutting region 6 extends along the direction of movement of the fabric 5.

[0039] Determine the laser slicing path 7.1, with each laser slicing unit 2 corresponding to a slicing area 6. Determine the laser slicing path 7.1 of each laser slicing unit 2 within the corresponding slicing area 6, and the laser slicing paths 7.1 of all laser slicing units 2 together form a closed shape 7.

[0040] The fabric conveying unit 1 drives the fabric 5 to move in a straight line at a set speed. During the movement of the fabric 5, each laser cutting unit 2 cuts the fabric 5 along the laser cutting path 7.1.

[0041] Specifically, the position of the laser slitting unit 2 is fixed. The slitting area of ​​the laser slitting unit 2 is set as a square with a side length of L. The actual slitting area of ​​the fabric 5 during the movement of the fabric 5 by the laser slitting unit 2 is a strip-shaped area with a width of L mm. The length direction of the strip-shaped area is parallel to the movement direction of the fabric 5. The value of L is 100-300 mm. The laser slitting path 7.1 of each slitting area 6 falls within the actual slitting area of ​​the corresponding laser slitting unit 2.

[0042] The dynamic cutting method for closed graphics in this embodiment employs multiple laser cutting units 2 working collaboratively to cut large-area closed graphics 7. Since each cutting area 6 is arranged sequentially along a direction perpendicular to the movement direction of the fabric 5, each laser cutting unit 2 corresponds to one cutting area 6 (i.e., each laser cutting unit 2 is responsible for one cutting area 6). Although the set cutting width of the laser cutting unit 2 is fixed and small, because the fabric 5 moves linearly at a set speed during the cutting process (equivalent to the fabric 5 remaining stationary while the laser cutting unit 2 moves linearly at a set speed), the actual cutting width of the laser cutting unit 2 becomes a strip-shaped width. The length direction of this strip-shaped width is parallel to the movement direction of the fabric 5, meaning each laser cutting unit... The actual cutting area of ​​element 2 will extend along the corresponding cutting area 6, so that it can cover the laser cutting path 7.1 within the corresponding cutting area 6, thereby effectively increasing the actual cutting area of ​​the same laser cutting unit 2, and enabling the same laser cutting unit 2 to cut a longer cutting path (cut a longer cutting path in the direction of fabric 5 movement). Based on this, the dynamic cutting method of closed pattern in this solution is beneficial to use fewer laser cutting units 2 to achieve the cutting processing of closed pattern 7; especially when the length of closed pattern 7 in the direction of fabric 5 movement is long, it can effectively reduce the number of laser cutting units 2 required.

[0043] Specific embodiment three: A dynamic cutting method for closed patterns using a laser cutting system. The specific structure of the laser cutting system in this method is the same as in specific embodiment one. In this embodiment, two laser cutting units 2 are used to cut the fabric 5.

[0044] like Figure 2 As shown, a dynamic slitting method for closed graphics using a laser slitting system includes the following steps: The fabric 5 on the fabric conveying unit 1 is divided into two cutting areas 6 according to the closed shape 7 and the set cutting width of the laser cutting unit 2. Each cutting area 6 is arranged sequentially along the direction of movement of the fabric 5. Each cutting area 6 extends along the direction of movement of the fabric 5.

[0045] The laser slicing path 7.1 is determined, with each laser slicing unit 2 corresponding to a slicing region 6. The laser slicing path 7.1 of each laser slicing unit 2 within its corresponding slicing region 6 is determined; each slicing region 6 has one laser slicing path 7.1, and all slicing paths 7.1 within each slicing region 6 are continuous. The laser slicing paths 7.1 of all laser slicing units 2 together form a closed shape 7.

[0046] The fabric conveying unit 1 drives the fabric 5 to move in a straight line at a set speed. During the movement of the fabric 5, each laser cutting unit 2 cuts the fabric 5 along the laser cutting path 7.1.

[0047] Specifically, the laser cutting unit 2 is set to a square with a side length of L. The position of the laser cutting unit 2 is fixed (and the position of the set cutting area of ​​the laser cutting unit 2 is also fixed accordingly). The actual cutting area of ​​the laser cutting unit 2 cutting the fabric 5 during the movement of the fabric 5 is a strip-shaped area with a width of L mm. The length direction of the strip-shaped area is parallel to the movement direction of the fabric 5. The laser cutting path 7.1 of each cutting area 6 falls within the actual cutting area of ​​the corresponding laser cutting unit 2. The value of L is 100-300 mm. Taking L as an example with a value of 230 mm, the sum of the widths of the actual cutting areas of the two laser cutting units 2 in this embodiment is 460 mm. Therefore, the dynamic cutting method of this embodiment is suitable for cutting closed shapes 7 whose maximum width in the direction perpendicular to the movement direction of the fabric 5 is less than 460 mm; while the maximum length of the closed shape 7 in the movement direction of the fabric 5 is not limited.

[0048] The dynamic cutting method for closed graphics in this embodiment employs two laser cutting units 2 working collaboratively to cut large-area closed graphics 7. Since each cutting area 6 is arranged sequentially along a direction perpendicular to the movement direction of the fabric 5, each laser cutting unit 2 corresponds to one cutting area 6 (i.e., each laser cutting unit 2 is responsible for one cutting area 6). Although the set cutting width of the laser cutting unit 2 is fixed and small, because the fabric 5 moves linearly at a set speed during the cutting process (equivalent to the fabric 5 remaining stationary while the laser cutting unit 2 moves linearly at a set speed), the actual cutting width of the laser cutting unit 2 becomes a strip-shaped width. The length direction of this strip-shaped width is parallel to the movement direction of the fabric 5, meaning each laser cutting unit... The actual cutting area of ​​element 2 will extend along the corresponding cutting area 6, so that it can cover the laser cutting path 7.1 within the corresponding cutting area 6, thereby effectively increasing the actual cutting area of ​​the same laser cutting unit 2, and enabling the same laser cutting unit 2 to cut a longer cutting path (cut a longer cutting path in the direction of fabric 5 movement). Based on this, the dynamic cutting method of closed pattern in this solution is beneficial to use fewer laser cutting units 2 to achieve the cutting processing of closed pattern 7; especially when the length of closed pattern 7 in the direction of fabric 5 movement is long, it can effectively reduce the number of laser cutting units 2 required.

[0049] Specific Embodiment Four: A dynamic slitting method for closed patterns using a laser slitting system. The specific structure of the laser slitting system in this method is the same as in Specific Embodiment One. In this embodiment, three or more laser slitting units 2 are used to slit the fabric 5. In this embodiment, the slitting of fabric 5 by three laser slitting units 2 is described as an example.

[0050] like Figure 3 As shown, a dynamic slitting method for closed graphics using a laser slitting system includes the following steps: The fabric 5 on the fabric conveying unit 1 is divided into three cutting areas 6 according to the closed shape 7 and the set cutting width of the laser cutting unit 2. Each cutting area 6 is arranged sequentially along the direction of movement of the fabric 5. Each cutting area 6 extends along the direction of movement of the fabric 5.

[0051] The laser slitting path 7.1 is determined, with each laser slitting unit 2 corresponding to a slitting region 6. The laser slitting path 7.1 of each laser slitting unit 2 within its corresponding slitting region 6 is determined. In the three slitting regions 6, the two end slitting regions 6 each have one laser slitting path 7.1, while the remaining slitting regions 6 each have two laser slitting paths 7.1 (i.e., the middle slitting region 6 has two laser slitting paths 7.1). Furthermore, the two laser slitting paths within the same slitting region are arranged along the fabric movement direction (i.e., the two laser slitting paths 7.1 in the middle slitting region 6 are disconnected and arranged back-to-back along the fabric movement direction). Each laser slitting path 7.1 in each slitting region 6 is a continuous slitting path. The laser slitting paths 7.1 of all laser slitting units 2 together form a closed shape 7.

[0052] The fabric conveying unit 1 drives the fabric 5 to move in a straight line at a set speed. During the movement of the fabric 5, each laser cutting unit 2 cuts the fabric 5 along the laser cutting path 7.1. Specifically, the laser cutting unit 2 corresponding to the middle cutting area 6 works as follows: During the movement of the fabric 5, the laser cutting unit 2 first cuts the fabric 5 along one of the laser cutting paths 7.1. After completing the cutting of this laser cutting path 7.1, it waits for the fabric 5 to move and when the other laser cutting path 7.1 is delivered into place. During the movement of the fabric 5, the laser cutting unit 2 cuts the fabric 5 along the other laser cutting path 7.1, completing the cutting of the other laser cutting path 7.1.

[0053] Specifically, the laser slitting unit 2 is set to a square with a side length of L. The position of the laser slitting unit 2 is fixed (and the position of the set slitting area of ​​the laser slitting unit 2 is also fixed accordingly). The actual slitting area of ​​the laser slitting unit 2 cutting the fabric 5 during the movement of the fabric 5 is a strip-shaped area with a width of L mm, and the length direction of the strip-shaped area is parallel to the movement direction of the fabric 5. The laser slitting path 7.1 of each slitting area 6 falls within the actual slitting area of ​​the corresponding laser slitting unit 2. In this embodiment, in each laser slitting path 7.1 of the middle slitting area 6, the distance between the two points with the largest distance in the movement direction of the fabric 5 is less than L (this distance refers to the distance in the movement direction of the fabric 5).

[0054] The value of L is 100-300mm. Taking L as 230mm as an example, the sum of the actual cutting widths of the three laser cutting units 2 in this embodiment is 690mm. Therefore, the dynamic cutting method of this embodiment is suitable for cutting closed graphics 7 whose maximum width in the direction perpendicular to the movement of the fabric 5 is less than 690mm; while the maximum length of the closed graphics 7 in the direction of movement of the fabric 5 is not limited. That is to say, for cutting widths of different sizes, different numbers of cutting regions 6 can be divided in the dynamic cutting method of the closed graphics in this application, and corresponding laser cutting units 2 can be configured to meet the cutting needs of cutting widths of different sizes.

[0055] The dynamic cutting method for closed graphics in this embodiment employs three laser cutting units 2 working collaboratively to cut large-area closed graphics 7. Since each cutting area 6 is arranged sequentially along a direction perpendicular to the movement direction of the fabric 5, each laser cutting unit 2 corresponds to one cutting area 6 (i.e., each laser cutting unit 2 is responsible for one cutting area 6). Although the set cutting width of the laser cutting unit 2 is fixed and small, because the fabric 5 moves linearly at a set speed during the cutting process (equivalent to the fabric 5 remaining stationary while the laser cutting unit 2 moves linearly at a set speed), the actual cutting width of the laser cutting unit 2 becomes a strip-shaped width. The length direction of this strip-shaped width is parallel to the movement direction of the fabric 5, meaning each laser cutting unit... The actual cutting area of ​​element 2 will extend along the corresponding cutting area 6, so that it can cover the laser cutting path 7.1 within the corresponding cutting area 6, thereby effectively increasing the actual cutting area of ​​the same laser cutting unit 2, and enabling the same laser cutting unit 2 to cut a longer cutting path (cut a longer cutting path in the direction of fabric 5 movement). Based on this, the dynamic cutting method of closed pattern in this solution is beneficial to use fewer laser cutting units 2 to achieve the cutting processing of closed pattern 7; especially when the length of closed pattern 7 in the direction of fabric 5 movement is long, it can effectively reduce the number of laser cutting units 2 required.

[0056] On the other hand, compared with the static slitting process of the prior art, where each laser can only be responsible for one cutting path, this embodiment uses the movement of the fabric 5 so that each laser slitting unit 2 in the middle slitting area 6 can complete the cutting of two laser slitting paths 7.1, thereby further reducing the number of laser slitting units 2 required.

[0057] Specific embodiment five: A dynamic slitting method for closed patterns using a laser slitting system. The specific structure of the laser slitting system in this method is the same as in specific embodiment one. In this embodiment, three or more laser slitting units 2 are used to slit the fabric 5. In this embodiment, the slitting of fabric 5 by four laser slitting units 2 is described as an example.

[0058] A dynamic slitting method for closed graphics using a laser slitting system includes the following steps: The fabric 5 on the fabric conveying unit 1 is divided into four cutting areas 6 according to the closed shape 7 and the set cutting width of the laser cutting unit 2. Each cutting area 6 is arranged sequentially along the direction perpendicular to the movement of the fabric 5. Each cutting area 6 extends along the movement direction of the fabric 5.

[0059] The laser slitting path 7.1 is determined, with each laser slitting unit 2 corresponding to a slitting region 6. The laser slitting path 7.1 of each laser slitting unit 2 within its corresponding slitting region 6 is determined. In the four slitting regions 6, the two end slitting regions 6 each have one laser slitting path 7.1, while the remaining slitting regions 6 each have two laser slitting paths 7.1 (i.e., the two middle slitting regions 6 each have two laser slitting paths 7.1). Furthermore, the two laser slitting paths within the same slitting region are arranged along the fabric movement direction (i.e., the two laser slitting paths 7.1 within the same slitting region 6 in the middle position are disconnected and arranged along the fabric movement direction, with the two laser slitting paths within the same slitting region arranged sequentially along the fabric movement direction). Each laser slitting path 7.1 in each slitting region 6 is a continuous slitting path. The laser slitting paths 7.1 of all laser slitting units 2 together form a closed shape 7.

[0060] The fabric conveying unit 1 drives the fabric 5 to move in a straight line at a set speed. During the movement of the fabric 5, each laser cutting unit 2 cuts the fabric 5 along the laser cutting path 7.1. Specifically, the laser cutting unit 2 corresponding to the two middle cutting areas 6 works as follows: During the movement of the fabric 5, the laser cutting unit 2 first cuts the fabric 5 along one of the laser cutting paths 7.1. After completing the cutting of this laser cutting path 7.1, it waits for the fabric 5 to move and when the other laser cutting path 7.1 is delivered into place. During the movement of the fabric 5, the laser cutting unit 2 cuts the fabric 5 along the other laser cutting path 7.1, completing the cutting of the other laser cutting path 7.1.

[0061] Specifically, the laser slitting unit 2 is set to a square with a side length of L. The position of the laser slitting unit 2 is fixed (and the position of the set slitting area of ​​the laser slitting unit 2 is also fixed accordingly). The actual slitting area of ​​the laser slitting unit 2 cutting the fabric 5 during the movement of the fabric 5 is a strip-shaped area with a width of L mm, and the length direction of the strip-shaped area is parallel to the movement direction of the fabric 5. The laser slitting path 7.1 of each slitting area 6 falls within the actual slitting area of ​​the corresponding laser slitting unit 2. In this embodiment, in each laser slitting path 7.1 of the two middle slitting areas 6, the distance between the two points with the largest distance in the movement direction of the fabric 5 is less than L (this distance refers to the distance in the movement direction of the fabric 5).

[0062] The value of L is 100-300mm. Taking L as 230mm as an example, the sum of the actual cutting widths of the three laser cutting units 2 in this embodiment is 920mm. Therefore, the dynamic cutting method of this embodiment is suitable for cutting closed graphics 7 whose maximum width in the direction perpendicular to the movement of the fabric 5 is less than 920mm; while the maximum length of the closed graphics 7 in the direction of movement of the fabric 5 is not limited. That is to say, for different sizes of cutting widths, different numbers of cutting regions 6 can be divided in the dynamic cutting method of the closed graphics in this application, and corresponding laser cutting units 2 can be configured accordingly to meet the cutting needs of different sizes of cutting widths.

[0063] The dynamic cutting method for closed graphics in this embodiment employs four laser cutting units 2 working collaboratively to cut large-area closed graphics 7. Since each cutting area 6 is arranged sequentially along a direction perpendicular to the movement direction of the fabric 5, each laser cutting unit 2 corresponds to one cutting area 6 (i.e., each laser cutting unit 2 is responsible for one cutting area 6). Although the set cutting width of the laser cutting unit 2 is fixed and small, because the fabric 5 moves linearly at a set speed during the cutting process (equivalent to the fabric 5 remaining stationary while the laser cutting unit 2 moves linearly at a set speed), the actual cutting width of the laser cutting unit 2 becomes a strip-shaped width. The length direction of this strip-shaped width is parallel to the movement direction of the fabric 5, meaning each laser cutting unit... The actual cutting area of ​​element 2 will extend along the corresponding cutting area 6, so that it can cover the laser cutting path 7.1 within the corresponding cutting area 6, thereby effectively increasing the actual cutting area of ​​the same laser cutting unit 2, and enabling the same laser cutting unit 2 to cut a longer cutting path (cut a longer cutting path in the direction of fabric 5 movement). Based on this, the dynamic cutting method of closed pattern in this solution is beneficial to use fewer laser cutting units 2 to achieve the cutting processing of closed pattern 7; especially when the length of closed pattern 7 in the direction of fabric 5 movement is long, it can effectively reduce the number of laser cutting units 2 required.

[0064] On the other hand, compared with the existing static slitting process, where each laser can only be responsible for one cutting path, this solution uses the movement of the fabric 5 so that each laser slitting unit 2 in the two middle slitting areas 6 can complete the cutting of two laser slitting paths 7.1, thereby further reducing the number of laser slitting units 2 required.

[0065] Specific embodiment six: The specific method in this embodiment refers to a dynamic cutting method for closed graphics using a laser cutting processing system in any of the specific embodiments two to five. The difference lies in that... like Figure 4 As shown, each laser cutting path 7.1 has over-cutting paths at both ends, with one end having the starting over-cutting path 8 and the other end having the ending over-cutting path 9. Figure 4 The laser slicing paths of each laser slicing unit are illustrated using lines of different widths. The endpoint of the starting slicing path 8 is the starting point of the corresponding laser slicing path 7.1, and the endpoint of laser slicing path 7.1 is the starting point of the corresponding endpoint slicing path 9. All slicing paths are located within the closed figure 7, that is, all starting slicing paths 8 and all endpoint slicing paths 9 are located within the closed figure 7.

[0066] During the movement of the fabric 5, each laser cutting unit 2 cuts the fabric 5 to be cut from the starting point of the starting point over-cutting path 8, along the starting point over-cutting path 8, the corresponding laser cutting path 7.1, and the ending point over-cutting path 9, until the ending point of the corresponding ending point over-cutting path 9.

[0067] In the dynamic cutting method of the closed pattern in this embodiment, an overcutting path is set at the connection endpoint of any two adjacent laser cutting paths 7.1, and the overcutting path is located in the waste area inside the closed pattern 7. In this way, on the one hand, it can prevent cutting the fabric 5 body; on the other hand, since there are two overcutting paths at the connection endpoint of any two adjacent laser cutting paths 7.1 in the closed pattern 7, even if the endpoint position of the laser cutting path 7.11 of each laser cutting unit 2 is deviated, the overcutting path at the end of the laser cutting path 7.1 can ensure that the laser movement path (non-closed pattern 7) of each laser cutting unit 2 is successfully cut at the predetermined intersection, thereby ensuring that the closed pattern 7 is completely cut without the phenomenon of sticking. This effectively solves the problem in the prior art that when the laser cutting process of fabric 5 is used to cut the closed pattern 7, the cutting pattern is not easy to align and deviations are easy to occur, resulting in the closed pattern 7 not being completely cut.

[0068] Specifically, at the connection endpoint between any two adjacent laser cutting paths 7.1 in the closed figure 7, there are two overcutting paths, both of which are starting overcutting paths 8; or both of which are ending overcutting paths 9; or one of the two overcutting paths is the starting overcutting path 8 and the other is the ending overcutting path 9.

[0069] In this embodiment, at the connection endpoint between any two adjacent laser slicing paths 7.1 in the closed shape 7, there are two over-cutting paths, one of which is the starting over-cutting path 8 and the other is the ending over-cutting path 9. The laser slicing paths 7.1 of each laser slicing unit 2 are connected end to end to form a closed shape 7.

[0070] Specific embodiment seven: The specific method in this embodiment refers to a dynamic cutting method for closed graphics using a laser cutting processing system in any of the specific embodiments two through six. The difference lies in that... The parameters for each laser cutting unit 2 when cutting the fabric 5 are as follows: laser wavelength is 0.8-20 micrometers, repetition frequency is 1-3MHz, and pulse width is less than 100ps.

[0071] In one example, the laser parameters set for each laser slitting unit 2 are: laser wavelength of 800 nm, repetition frequency of 1.5 MHz, and pulse width of less than 80 ps.

[0072] In another example, the laser parameters set for each laser slitting unit 2 are: laser wavelength of 1064 nm, repetition frequency of 2 MHz, and pulse width of less than 15 ps.

[0073] In the third example, the laser parameters set for each laser slitting unit 2 are: laser wavelength of 12 micrometers, repetition frequency of 3 MHz, and pulse width of less than 40 ps.

[0074] In the fourth example, the laser parameters set for each laser slitting unit 2 are: laser wavelength of 20 micrometers, repetition frequency of 1 MHz, and pulse width of less than 60 ps.

[0075] Through extensive research and development and numerous experiments, the inventors discovered that using a picosecond pulsed laser to cut fabric 5, and employing the laser parameters described in this embodiment during the cutting process, can effectively prevent crystallization at the cutting edge of fabric 5, resulting in a better tactile feel at the cut surface to meet the requirements of skin contact and ensuring cutting quality. This effectively solves the problem in the existing technology where the laser cutting process of fabric 5 using a CO2 laser has a high degree of crystallization at the cutting edge, poor tactile feel, and may even easily scratch the skin, making it difficult to meet the requirements of skin contact.

[0076] In this embodiment, when the slitting speed of the laser slitting unit 2 is determined to be 100 m / min, the operating power of a single laser slitting unit 2 is not less than 80 W. When the slitting speed of the laser slitting unit 2 is determined to be 200 m / min, the operating power of a single laser slitting unit 2 is not less than 100 W. When the slitting speed of the laser slitting unit 2 is determined to be 300 m / min, the operating power of a single laser slitting unit 2 is not less than 200 W. The operating power of the laser slitting unit 2 is related to the slitting speed in the specific processing. As the slitting speed increases, the operating power of the laser slitting unit 2 is increased accordingly to ensure the slitting quality.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A laser slitting system, characterized in that, include: The fabric conveying unit (1) maintains the shape of the fabric and drives the fabric to move in a straight line at a set speed; The laser cutting unit (2) cuts the fabric moving at a set speed on the fabric conveying unit along a predetermined trajectory. The controller controls the operating parameters of the laser slitting system, including the operating parameters of the fabric conveying unit and the laser slitting unit.

2. The laser slitting system according to claim 1, characterized in that, It also includes a negative pressure device (3) to provide negative pressure holding force to the fabric held on the surface of the fabric conveying unit so that the fabric maintains a set shape movement.

3. The laser slitting system according to claim 2, characterized in that, The fabric conveying unit (1) adopts a belt conveyor. The surface of the conveyor belt (1.1) of the belt conveyor is distributed with several adsorption holes, and the negative pressure device (3) is located in the loop formed by the conveyor belt.

4. The laser slitting system according to any one of claims 1-3, characterized in that, It also includes a cleaning device (4) to clean the impurities that remain on the surface of the fabric conveying unit during the cutting process.

5. A dynamic slitting method for a closed pattern using the laser slitting system according to any one of claims 1-4, characterized in that, Includes the following steps: The fabric on the fabric conveying unit is divided into at least two cutting areas according to the closed shape and the set cutting width of the laser cutting unit. Each cutting area is arranged in sequence along the direction perpendicular to the fabric movement. Determine the laser slicing path. Each laser slicing unit corresponds to a slicing area. Determine the laser slicing path of each laser slicing unit within the corresponding slicing area. The laser slicing paths of all laser slicing units together form a closed figure. The fabric conveying unit drives the fabric to move in a straight line at a set speed, and each laser cutting unit cuts the fabric along the laser cutting path during the fabric movement.

6. The dynamic slitting method for closed graphics using a laser slitting system according to claim 5, characterized in that, There are two laser cutting units and two cutting areas. Each cutting area extends along the direction of fabric movement, and each cutting area has a laser cutting path. Each laser cutting path in each cutting area is a continuous cutting path.

7. The dynamic cutting method for closed graphics using a laser cutting system according to claim 5, characterized in that, There are three or more laser slitting units, and there are three or more slitting areas. The two slitting areas at the ends have one laser slitting path, and the remaining slitting areas have two laser slitting paths. The two laser slitting paths in the same slitting area are arranged along the direction of fabric movement. Each slitting area extends along the direction of fabric movement, and each laser slitting path in each slitting area is a continuous slitting path.

8. The dynamic slitting method for closed graphics using a laser slitting system according to any one of claims 5-7, characterized in that, The laser slitting unit is set to slitting the area as a square with a side length of L. The actual slitting area of ​​the laser slitting unit cutting the fabric during the fabric movement is a strip-shaped area with a width of L and the length direction of the strip-shaped area is parallel to the fabric movement direction. The laser slitting path of each slitting area falls within the actual slitting area of ​​the corresponding laser slitting unit.

9. The dynamic slitting method for closed graphics using a laser slitting system according to any one of claims 5-7, characterized in that, Each laser cutting path has overcutting paths at both ends. One overcutting path is the starting overcutting path, and the other overcutting path is the ending overcutting path. The end of the starting overcutting path is the starting point of the corresponding laser cutting path, and the end of the laser cutting path is the starting point of the corresponding ending overcutting path. Each overcutting path is located within a closed shape. During the fabric movement, each laser cutting unit cuts the fabric to be cut along the starting point of the starting cutting path, the corresponding laser cutting path, and the ending cutting path until the end point of the corresponding ending cutting path.

10. The dynamic slitting method for closed graphics using a laser slitting system according to any one of claims 5-7, characterized in that, The parameters for cutting the fabric by each laser slitting unit are as follows: laser wavelength is 0.8-20 micrometers, repetition frequency is 1-3MHz, and pulse width is less than 100ps.

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