A slitting mechanism for stretching film

Abstract

The utility model discloses a slitting mechanism field's a kind of for stretch film's slitting mechanism, including rack, one end of the rack is provided with driving assembly, one end of the rack is provided with two symmetrical side plates, one end of the side plate is equipped with connecting block by screw, the connecting block is provided with detachable slitting roller, the slitting roller is provided with several slitting knives, several slitting knives are all equidistantly arranged, and the both sides of two side plates are provided with leveling roller, and the both ends of leveling roller pass through the side plate and are rotationally connected between the side plate, and the both sides of two side plates are provided with movable plate, and the movable plate is threadedly connected between screw and side plate;The utility model discloses a kind of for stretch film's slitting mechanism, by setting up leveling roller and pressing roller double-roller leveling, cooperate adjustable tension assembly, make stretch film keep flat before slitting, tension constant, effectively eliminate wrinkle and offset, improve slitting precision and finished product quality.

Description

Technical Field

[0001] This utility model relates to the field of slitting mechanisms, specifically a slitting mechanism for stretch films. Background Technology

[0002] Stretch film slitting machines are key equipment in industries such as packaging, electronics, and photovoltaics, used to cut wide master rolls into multiple rolls of finished products according to required widths. The core process requirement is that the film material must be in a "flat, wrinkle-free, and constant tension" state before the blades cut; otherwise, problems such as uneven edges, width deviations, film creases, or even film breakage and machine shutdown will occur. The slitting mechanism is the unit on the slitting machine that directly performs the slitting process, integrating blades, leveling devices, and conveying systems to ensure that the film material is accurately cut under constant tension.

[0003] Existing slitting mechanisms exhibit the following defects in actual production: Traditional models often use a single guide roller or simple pressure plate to flatten the film surface, failing to simultaneously achieve "flattening" and "tension maintenance." When the film thickness is uneven or the tension of the master roll varies significantly, the film surface is prone to localized looseness or bulging between the rollers, which is then directly cut off by the blade, resulting in defects such as wrinkles and wavy edges. Currently, a fixed clamping method is commonly used to provide tension, meaning the tension is usually not adjustable. However, in practice, the tension value fluctuates significantly with changes in the film roll diameter, making it impossible to precisely set for different materials such as PE, PET, and PVC, or for different thicknesses ranging from 12μm to 50μm. Excessive tension can easily thin and tear the film; insufficient tension results in a loose film surface, causing lateral shift during cutting and leading to poor width consistency in the finished product. Furthermore, the fixed clamping method cannot adjust the tension, making it prone to wrinkles and shifts. Secondly, most older equipment has a short feed path and a small number of guide rollers, resulting in insufficient distance between unwinding and slitting of the film material, failing to establish an effective tension buffer section. A sudden change in unwinding tension causes film surface vibration to be directly transmitted to the cutting point, resulting in instantaneous wrinkles and blade misalignment, affecting slitting accuracy. Traditional pressure rollers are fixedly installed, and the roller gap height is not adjustable, leading to poor adaptability to film materials of different thicknesses and further reducing yield. Therefore, existing slitting mechanisms also have the following problems: they cannot keep the stretched film flat and under constant tension before slitting, resulting in wrinkles and misalignment, and they cannot adapt to stretched films of different thicknesses and materials, requiring further improvement. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a slitting mechanism for stretch film, which can effectively solve the technical problems of existing slitting mechanisms being unable to keep the stretch film flat and with constant tension before slitting, resulting in wrinkles and displacement, and being unable to adapt to stretch films of different thicknesses and materials.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a slitting mechanism for stretch film, including a frame, a drive assembly at one end of the frame, two symmetrical side plates at one end of the frame, a connecting block installed at one end of each side plate by screws, a detachable slitting roller on the connecting block, a plurality of slitting blades on the slitting roller, the plurality of slitting blades being evenly distributed between each other, a leveling roller between the two side plates, the two ends of the leveling roller passing through the side plates and rotatably connected to the side plates, a movable plate between the two side plates, the movable plate being threadedly connected to the side plates by screws, and a pressing roller on the movable plate, the two ends of the pressing roller passing through the movable plate. The side plate is rotatably connected to the movable plate. One end of the side plate is provided with an adjustable tension assembly, which includes a slider and an adjusting roller. One end of the side plate extends outward to form a sliding part, and one end of the slider is recessed inward to form a groove. The slider slides along the sliding part through the groove. Both ends of the adjusting roller pass through the slider and are rotatably connected to it. One end of the side plate is provided with a fastening plate, which is threadedly connected to the side plate by screws. The fastening plate is provided with an adjusting bolt, one end of which extends to the slider and is connected to it. By adjusting the adjusting bolt, the slider slides along the side plate, thereby adjusting the tension of the adjusting roller.

[0006] Furthermore, several transmission rollers are arranged between the two side plates, and the transmission rollers are all equally spaced.

[0007] Furthermore, a support platform is provided at one end of the frame, and a positioning plate is installed on the surface of the support platform by screws. The drive assembly includes a rotary motor installed on the positioning plate by screws and a movable roller for transmitting the stretch film. The two ends of the movable roller pass through the side plate and are rotatably connected to the side plate. A connecting belt is provided between the output end of the rotary motor and the movable roller, and the output end of the rotary motor forms a transmission engagement with the movable roller through the connecting belt.

[0008] Furthermore, a support frame is installed at one end of the side plate by screws, and a fastening seat is installed at one end of the support frame by screws. The fastening seat is provided with a rotatable output roller, and both ends of the output roller pass through the fastening seat and are rotatably connected to the fastening seat.

[0009] Furthermore, one end of the frame is provided with an outer cover, one end of which extends to the outside of the side plate.

[0010] Furthermore, the bottom of the frame is provided with several feet, all of which are on the same horizontal plane.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a slitting mechanism for stretch film. By setting up a leveling roller and a pressing roller for leveling, and cooperating with an adjustable tension component, the stretch film is kept flat and the tension is constant before slitting, effectively eliminating wrinkles and deviations, improving slitting accuracy and finished product quality. The tension is infinitely adjustable by adjusting bolts, adapting to stretch films of different thicknesses and materials, and has strong versatility. Attached Figure Description

[0012] Figure 1 This is a perspective view of a slitting mechanism for stretch film according to the present invention;

[0013] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0014] Figure 3 This is a schematic diagram of the internal structure of a slitting mechanism for stretch film according to the present invention.

[0015] Numbering on the map:

[0016] 1-Frame; 2-Foot cup; 3-Side plate; 4-Outer cover; 5-Load-bearing platform; 6-Positioning plate; 7-Rotating motor; 8-Transfer roller; 9-Moving plate; 10-Pressing roller; 11-Leveling roller; 12-Moving roller; 13-Adjusting roller; 14-Connecting block; 15-Sliding roller; 16-Sliding knife; 17-Support frame; 18-Connecting belt; 19-Fastening seat; 20-Output roller; 21-Fastening plate; 22-Adjusting bolt; 23-Groove; 24-Slider; 25-Sliding part. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The following is combined Figures 1-3 A detailed description of a slitting mechanism for stretch film according to this utility model is provided below:

[0019] A slitting mechanism for stretch film includes a frame 1. A drive assembly is located at one end of the frame 1. Two symmetrical side plates 3 are located at one end of the frame 1. A connecting block 14 is screwed to one end of each side plate 3. A detachable slitting roller 15 is mounted on the connecting block 14. The slitting roller 15 has a plurality of slitting blades 16, which are evenly spaced. A leveling roller 11 is positioned between the two side plates 3, with both ends passing through and rotatably connected to the side plates 3. A movable plate 9 is positioned between the two side plates 3, threadedly connected to the side plates 3 by screws. A pressing roller 10 is mounted on the movable plate 9, with both ends passing through and rotatably connected to it. One end of the side plate 3 is provided with an adjustable tension assembly, which includes a slider 24 and an adjusting roller 13. One end of the side plate 3 extends outward to form a sliding part 25, and one end of the slider 24 is recessed inward to form a groove 23. The slider 24 slides along the sliding part 25 through the groove 23. Both ends of the adjusting roller 13 pass through the slider 24 and are rotatably connected to the slider 24. One end of the side plate 3 is provided with a fastening plate 21, which is threadedly connected to the side plate 3 by screws. The fastening plate 21 is provided with an adjusting bolt 22, one end of which extends to the slider 24 and is connected to the slider 24. By adjusting the adjusting bolt 22, the slider 24 slides along the side plate 3, thereby adjusting the tension of the adjusting roller 13.

[0020] Several transmission rollers 8 are arranged between the two side plates 3, and the transmission rollers 8 are all equally spaced.

[0021] A support platform 5 is provided at one end of the frame 1. A positioning plate 6 is screwed onto the surface of the support platform 5. The drive assembly includes a rotary motor 7 screwed onto the positioning plate 6 and a movable roller 12 for conveying the stretch film. Both ends of the movable roller 12 pass through the side plate 3 and are rotatably connected to the side plate 3. A connecting belt 18 is provided between the output end of the rotary motor 7 and the movable roller 12, forming a transmission engagement between the output end of the rotary motor 7 and the movable roller 12 through the connecting belt 18. Furthermore, the movable roller 12 is meshed with an adjusting roller 13. The rotary motor 7 drives the connecting belt 18 to rotate the movable roller 12, thereby causing the adjusting roller 13 to rotate.

[0022] One end of the side plate 3 is fitted with a support frame 17 by screws, and one end of the support frame 17 is fitted with a fastening seat 19 by screws. The fastening seat 19 is provided with a rotatable output roller 20, and both ends of the output roller 20 pass through the fastening seat 19 and are rotatably connected to the fastening seat 19.

[0023] One end of the frame 1 is provided with an outer cover 4, and one end of the outer cover 4 extends to the outside of the side plate 3.

[0024] The bottom of the frame 1 is provided with several foot cups 2, all of which are on the same horizontal plane.

[0025] In this embodiment, the frame 1, serving as the main frame of the equipment, is welded from high-strength steel. Several foot cups 2 are installed at the bottom to ensure the equipment's horizontal stability and prevent precision deviations caused by equipment shaking during the slitting process. The leveling roller 11 is fixed between two side plates 3, and its surface is chrome-plated to reduce the coefficient of friction. Its function is to eliminate initial wrinkles on the surface of the stretch film through the pressure of the upper and lower rollers. The pressing roller 10 passes through and is rotatably connected to the movable plate 9 at both ends. The movable plate 9 is threadedly connected to the side plates 3 by screws. The gap between the pressing roller 10 and the leveling roller 11 can be changed by adjusting the tightness of the screws to accommodate stretch films of different thicknesses. The leveling roller 11 and the pressing roller 10 form a two-stage leveling structure, significantly improving the flatness of the film material. By rotating the adjusting bolt 22, the slider 24 can be pushed along the sliding part 25, thereby changing the position of the adjusting roller 13 and achieving stepless tension adjustment (clockwise rotation increases tension, counterclockwise rotation decreases tension). This design is adaptable to stretch films of different materials (such as PE and PVC) or thicknesses, avoiding slitting misalignment or film breakage caused by tension fluctuations. The slitting roller 15 is detachably mounted to the side plate 3 via the connecting block 14. The slitting blades 16 are evenly arranged on the roller surface, with the blade spacing set according to the target slitting width. The detachable design facilitates the replacement of slitting rollers 15 of different specifications, improving the equipment's versatility. Several transfer rollers 8 are evenly arranged between the side plates 3, forming a stable transfer path to ensure that the stretch film remains horizontal during slitting, avoiding cutting errors caused by path misalignment.

[0026] In this embodiment, the slitting blade 16 adopts a circular blade design with a blade hardness of HRC60, ensuring a smooth cutting edge. The leveling roller 11 and the pressing roller 10 work together to eliminate film wrinkles and improve slitting accuracy. Precise tension control is achieved through the slider 24 and the adjusting bolt 22, adapting to film materials of different materials / thicknesses and avoiding film breakage or misalignment.

[0027] This embodiment provides a slitting mechanism for stretch film. By using a double-roller system of leveling roller 11 and pressing roller 10 for leveling, along with an adjustable tension component, the stretch film remains flat and under constant tension before slitting, effectively eliminating wrinkles and misalignment, improving slitting accuracy and finished product quality. The tension is steplessly adjustable via adjusting bolt 22, adapting to stretch films of different thicknesses and materials, offering strong versatility. In this embodiment, the frame 1 also includes a control panel (not shown), electrically connected to the rotating motor 7, which can be started or stopped. In this embodiment, the circuit principle of the rotating motor 7 and the working principle of the slitting mechanism for cutting the stretch film are conventional prior art and will not be described in detail here.

[0028] In the specific slitting and stretching film process, Step 1: Start the rotating motor 7, which drives the movable roller 12 to rotate via the connecting belt 18, drawing the stretching film material into the mechanism. Step 2: The stretching film passes sequentially through the leveling roller 11 and the pressing roller 10, achieving two-stage leveling to eliminate surface wrinkles. Step 3: The film material winds around the adjusting roller 13, and the position of the slider 24 is adjusted using the adjusting bolt 22 to achieve the preset tension. Step 4: The film material with constant tension enters the area of ​​the slitting roller 15, where the slitting blade 16 cuts at a set interval to form the finished product of the target width. Step 5: The slitting film material is guided by the transfer roller 8 to the output roller 20. After passing through the output roller 20, it is wound onto the winding roller on the slitting machine, and finally, the winding is completed.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A slitting mechanism for stretch film, comprising a frame, a drive assembly at one end of the frame, two symmetrical side plates at one end of the frame, a connecting block mounted to one end of each side plate by screws, a detachable slitting roller on the connecting block, and a plurality of slitting blades on the slitting roller, the plurality of slitting blades being evenly spaced, characterized in that: A leveling roller is installed between two side plates, with both ends of the leveling roller passing through and rotatably connected to the side plates. A movable plate is installed between the two side plates, and the movable plate is threadedly connected to the side plates by screws. A pressing roller is installed on the movable plate, with both ends of the pressing roller passing through and rotatably connected to the movable plate. An adjustable tension assembly is installed at one end of the side plate, the tension assembly including a slider and an adjusting roller. One end of the side plate extends outward to form a sliding part, and one end of the slider is recessed inward to form a groove. The slider slides along the sliding part through the groove. Both ends of the adjusting roller pass through the slider and are rotatably connected to the slider. A fastening plate is installed at one end of the side plate, and the fastening plate is threadedly connected to the side plate by screws. An adjusting bolt is installed on the fastening plate, with one end of the adjusting bolt extending to and connecting to the slider. By adjusting the adjusting bolt, the slider slides along the side plate, thereby adjusting the tension of the adjusting roller.

2. The slitting mechanism for stretch film according to claim 1, characterized in that: Several transmission rollers are arranged between the two side plates, and the transmission rollers are evenly distributed.

3. A slitting mechanism for stretch film according to claim 1, characterized in that: One end of the frame is provided with a support platform, and a positioning plate is installed on the surface of the support platform by screws. The drive assembly includes a rotary motor installed on the positioning plate by screws and a movable roller for transmitting the stretch film. The two ends of the movable roller pass through the side plate and are rotatably connected to the side plate. A connecting belt is provided between the output end of the rotary motor and the movable roller, and the output end of the rotary motor forms a transmission engagement with the movable roller through the connecting belt.

4. A slitting mechanism for stretch film according to claim 1, characterized in that: One end of the side plate is fitted with a support frame by screws, and one end of the support frame is fitted with a fastening seat by screws. The fastening seat is equipped with a rotatable output roller, and both ends of the output roller pass through the fastening seat and are rotatably connected to the fastening seat.

5. A slitting mechanism for stretch film according to any one of claims 1-4, characterized in that: One end of the frame is provided with an outer cover, and one end of the outer cover extends to the outside of the side plate.

6. A slitting mechanism for stretch film according to any one of claims 1-4, characterized in that: The bottom of the frame is provided with several foot cups, all of which are on the same horizontal plane.

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