A processing device for punching easy-tear lines on PVC films

Abstract

The present invention belongs to the field of PVC film processing, and specifically relates to a processing device for facilitating the punching of easy-tear lines on PVC film, comprising a feed roller group, a first roller group, a second roller group and a receiving roller group for transmitting the PVC film; a laser punching mechanism comprises a laser table arranged above the punching table, two ends of the laser table are supported by brackets installed at both ends of the punching table, and a plurality of laser punchers are arranged at intervals on the bottom; the front and rear ends of the punching position are pressed by edges through a pressure plate and a pressure roller, so as to change the tension application point of the punching section of the PVC film, the pressure roller can be rotated to temporarily replace the tension provided by the rotation of the second roller group, shorten the spacing and reduce the influence of the tension on the punching area, so as to prevent tearing and expansion at the opening; the channel spacing between the pressure plate and the supporting plate can be adjusted, so as to press and lift the side edges of the PVC film, so as to prevent the PVC film transmitted at the rear section from deviating due to instantaneous change in tension during punching, thereby playing a guiding and correcting role.

Description

Technical Field

[0001] The invention relates to the field of PVC film processing, and in particular to a processing device for punching easy-tear lines on PVC films. Background Art

[0002] A tear line is a pressure line that is easy to tear open. It is mostly found on paper or plastic products. Products with a tear line do not require scissors or violent tearing. Just pull it gently with both hands to tear the item open. The tear line is generally processed by using a dotted line cutting hob or a dotted line knife. With the advancement of technology, when punching the tear line of PVC film, lasers are used to emit laser punching instead of traditional cutting hobs or dotted line knives. The output laser has a high power density after focusing and can instantly melt or vaporize the irradiated material. In addition, the laser is a non-contact processing, making the laser very suitable for punching films.

[0003] The existing technology has the following problems:

[0004] 1. When drilling dense holes in rows on the surface of PVC film, due to the small spacing between laser holes, at the moment of melting at the punching point, the tension of the winding acts directly on the hole, causing tearing and expansion at the hole. In the same batch of products, it is inevitable that some holes do not meet the process requirements.

[0005] 2. Although the laser drilling process is a non-contact process, the temperature around the punching area rises due to radiation. The polymer around the punching area changes from a natural curling state to a state of moving toward the heat source, causing slight warping, which affects the flatness of the coil on the roller during the subsequent winding process. Summary of the Invention

[0006] (1) Purpose of the invention

[0007] In order to solve the technical problems existing in the background technology, the present invention proposes a processing device for punching easy-tear lines on PVC film. During the laser punching process, the PVC film is pressed at the inlet and outlet ends to reduce the influence of tension on the punching points and the frequency of tearing and expansion at the openings. In addition, a cooling mechanism is used to cool the surface of the PVC film at the outlet end of the laser punching to solve the problem of warping of the opening edges caused by temperature rise.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a processing device for punching easy-tear lines on PVC films, comprising a feed roller group for conveying PVC films, a first roller group, a second roller group and a receiving roller group;

[0010] The punching table is arranged between the first roller group and the second roller group. The laser punching mechanism includes a laser table arranged above the punching table. Both ends of the laser table are supported by brackets installed at both ends of the punching table. A plurality of laser punches are arranged at intervals at the bottom.

[0011] The distance adjustment mechanism includes a distance adjustment platform symmetrically arranged at the feeding position of the punching platform, a slide groove is provided inside the distance adjustment platform, and a screw hole seat with a screw hole is installed on the top, a stud is connected to the internal thread of the screw hole seat, a slider embedded in the slide groove is provided below the stud, a pressure plate is connected to the slider, a support plate fixedly installed on the punching platform is provided below the pressure plate, and a spring is installed between the pressure plate and the support plate;

[0012] The cooling mechanism includes a cooling table arranged at the discharge position of the punching table, the cooling table having a built-in low-temperature roller sleeve, a low-temperature roller arranged in the "U-shaped groove" of the low-temperature roller sleeve, a pressure roller attached to the outer wall is arranged below the low-temperature roller, and a transmission gap for the PVC film is left between the pressure roller and the punching table.

[0013] Preferably, when the stud pushes the slider downward, the spring member is compressed by the thrust.

[0014] Preferably, the pressing plate and the distance adjustment platform are slidably connected via the slider.

[0015] Preferably, the feed ports of the pressing plate member and the supporting plate member are both "arc-shaped structures", and the ends of the pressing plate members are the same "arc-shaped structures".

[0016] Preferably, the low-temperature roller and the pressure roller are controlled by an external driving device to rotate synchronously.

[0017] Preferably, the inner cavity of the low-temperature roller sleeve is connected to an external refrigeration device through a cold water pipe.

[0018] Preferably, a detachable waste box is installed in the middle of the punching table, and the slotted end surface of the waste box faces the laser output end of the laser puncher.

[0019] Preferably, a baffle of a "lead component" is installed at the bottom of the waste box, and activated carbon strips are installed on the side walls.

[0020] Preferably, the PVC film transmission angle between the second roller group and the receiving roller group is 10 to 30 degrees.

[0021] The above technical solution of the present invention has the following beneficial technical effects:

[0022] 1. During the punching process of the PVC film, the front and rear ends of the punching position are pressed by the pressure plate and the pressure roller to change the tension point of the punching section of the PVC film. The pressure roller can rotate to temporarily replace the tension provided by the rotation of the second roller group, shorten the spacing, reduce the influence of tension on the punching area, and prevent tearing and expansion at the opening.

[0023] 2. The channel spacing between the pressing plate and the supporting plate can be adjusted to press and lift the side of the PVC film to prevent the PVC film being transmitted in the rear section from deflecting due to instantaneous changes in tension during punching, thereby playing a guiding and correcting role.

[0024] 3. The low-temperature roller and the pressure roller are controlled by an external drive device to rotate synchronously. The low-temperature roller first contacts the low-temperature roller sleeve to reduce the surface temperature. When the pressure roller contacts the low-temperature roller sleeve, the surface temperature of the pressure roller is reduced again. The low-temperature pressure roller rotates to contact the PVC film whose surface temperature rises after punching, and the molecules in the punching range of the PVC film move toward the heat source point to a naturally curled state. The rotating pressure roller can press down the raised hole edge, so that the surface is flat after passing through the pressure roller, thereby improving the flatness of the PVC film wound on the roller during the subsequent winding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the laser drilling mechanism structure of the present invention;

[0027] Figure 3 Schematic diagram of the distance adjustment mechanism structure of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the cooling mechanism of the present invention;

[0029] Figure 5 Schematic diagram of the internal structure of the cooling stage of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the waste box of the present invention;

[0031] Figure 7 It is a schematic diagram of PVC film transmission of the present invention.

[0032] Reference numerals:

[0033] 11. Feed roller group; 12. First roller group; 13. Second roller group; 14. Receiving roller group; 2. Punching table; 21. Waste box; 31. Bracket; 32. Laser table; 33. Laser puncher; 41. Distance adjustment table; 42. Screw hole seat; 43. Stud; 44. Slider; 45. Pressing plate; 46. Supporting plate; 47. Spring; 51. Cooling table; 52. Cold water pipe; 53. Low-temperature roller sleeve; 54. Low-temperature roller; 55. Pressing roller. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0035] like Figure 1 As shown, the present invention proposes a processing device for punching easy-tear lines on PVC films, comprising a feed roller group 11 for conveying PVC films, a first roller group 12, a second roller group 13 and a receiving roller group 14;

[0036] It should be noted that the PVC film feeding section is between the feed roller group 11 and the first roller group 12; the PVC film punching section is between the first roller group 12 and the second roller group 13; and the PVC film receiving end is between the second roller group 13 and the receiving roller group 14.

[0037] Specifically, the PVC film transmission angle between the second roller group 13 and the receiving roller group 14 is 10 to 30 degrees. Because part of the horizontal tension is decomposed into a downward force perpendicular to the inclined surface, this part of the force does negative work relative to the direction of movement. Similarly, the larger the inclined surface, the closer it is to vertical. The vertical tension must be greater than the weight of the object itself to move the object. Therefore, the closer to the vertical angle, the more effort it takes. The force borne by the inclined surface becomes smaller as the angle increases. In this application, the PVC film transmission angle between the second roller group 13 and the receiving roller group 14 is 15 degrees, which reduces the influence of tension on the tear line perforation area of the PVC film and prevents the PVC film from tearing and separating during the winding process.

[0038] like Figure 2 and Figure 6 As shown, the punching table 2 is arranged between the first roller group 12 and the second roller group 13, and the laser punching mechanism includes a laser table 32 arranged above the punching table 2. The two ends of the laser table 32 are supported by brackets 31 installed at both ends of the punching table 2, and a number of laser punchers 33 are arranged at intervals at the bottom.

[0039] As an example of punching: a number of laser punchers 33 are arranged at intervals on the laser table 32. The laser punchers 33 emit lasers through the output end. The lasers act on the PVC film transmitted on the punching table 2. The focused laser power increases, causing the punching area of the PVC film to melt instantly, completing the hole opening.

[0040] In order to facilitate the collection of waste after punching, a detachable waste box 21 is further installed in the middle of the punching table 2, and a protruding horizontal plate is installed on the side wall of the waste box 21. The end surface of the punching table 2 and the side wall of the waste box 21 are attached with a matching guide groove. The waste box 21 and the punching table 2 are combined through the cooperation of the horizontal plate and the guide groove. The slotted end face of the combined waste box 21 faces the laser output end of the laser puncher 33. During the laser punching process, the fallen waste accumulates in the slot to assist in the collection of the waste.

[0041] It should be noted that: laser is penetrating. After punching, the laser extends. Long-term action on the bottom of the waste box 21 will cause it to break down, resulting in waste leakage and a risk of combustion. A baffle with a "lead structure" is installed at the bottom of the waste box 21. Because its atomic structure is stable, it is less affected by the laser and can act as a bottom plate to block the laser. Activated carbon strips are installed on the side walls of the waste box 21 to collect the waste gas generated by laser punching of the PVC film.

[0042] like Figure 2-4 As shown, the distance adjustment mechanism includes a distance adjustment platform 41 symmetrically arranged at the feeding position of the punching table 2, a chute is provided inside the distance adjustment platform 41, and a screw hole seat 42 with a screw hole is installed on the top, a stud 43 is connected to the inner thread of the screw hole seat 42, and a slider 44 embedded in the chute is provided below the stud 43, a pressing plate 45 is connected to the slider 44, and a supporting plate 46 fixedly installed on the punching table 2 is provided below the pressing plate 45, and a spring 47 is installed between the pressing plate 45 and the supporting plate 46.

[0043] The cooling mechanism includes a cooling table 51 arranged at the discharge position of the punching table 2. The cooling table 51 has a built-in low-temperature roller sleeve 53. A low-temperature roller 54 is arranged in the "U-shaped groove" of the low-temperature roller sleeve 53. A pressure roller 55 attached to the outer wall is arranged below the low-temperature roller 54. A transmission gap for the PVC film is left between the pressure roller 55 and the punching table 2.

[0044] In one embodiment, during the punching process of the PVC film, the front and rear ends of the punching position are pressed by the edge covering of the pressure plate 45 and the pressure roller 55, thereby changing the tension application point of the punching section of the PVC film, and changing the traction spacing between the first roller group 12 and the second roller group 13 to the spacing between the pressure plate 45 and the pressure roller 55. The pressure roller 55 can rotate to temporarily replace the tension provided by the rotation of the second roller group 13, shortening the spacing to reduce the influence of tension on the punching area, and preventing tearing and expansion at the opening.

[0045] As an example of the working of the distance adjustment mechanism: the pressure plate 45 and the distance adjustment platform 41 are slidably connected by the slider 44, and the pressure plate 45 moves along the inner groove of the distance adjustment platform 41 to the position of the pressure plate 45 to adjust the distance between the pressure plate 45 and the supporting plate 46. The stud 43 rotates along the inner wall thread of the screw hole seat 42, and the protrusion at the bottom end contacts the slider 44. The slider 44 is affected by the thrust and drives the pressure plate 45 to be pressed down. The spring part 47 is compressed under the thrust, and the channel between the pressure plate 45 and the supporting plate 46 is adjusted to a distance that matches the thickness of the PVC film. The side of the PVC film is pressed and lifted to prevent the PVC film transmitted in the rear section from being offset due to the instantaneous change of tension during punching, thereby playing a guiding and correcting role.

[0046] Among them, the feed ports of the pressure plate part 45 and the support plate part 46 are both "arc-shaped structures", and the end of the pressure plate part 45 is the same "arc-shaped structure"; the inlet and outlet design of the "arc-shaped structure" only reserves the inlet and outlet openings as narrow openings, and the supporting sections between them have no contact with the PVC film, preventing large-scale friction from occurring when multiple points of contact cause wear on the side of the PVC film.

[0047] It should be added that the spring member 47 has a reset function. When the protruding portion of the stud 43 does not interfere with the slider 44, the spring member 47 is not pushed down by the thrust and is in a relaxed state after reset.

[0048] As an example of the working of the cooling mechanism: the low-temperature roller 54 and the pressure roller 55 are controlled by an external driving device to rotate synchronously. When the two rotate, the low-temperature roller 54 first contacts the low-temperature roller sleeve 53 to reduce the surface temperature, and when the pressure roller 55 contacts the low-temperature roller sleeve 53, the surface temperature of the pressure roller 55 is reduced again. The low-temperature pressure roller 55 rotates to contact the PVC film whose surface temperature rises after punching, and cools the molecules in the punching range of the PVC film to a naturally curled state from an active state toward the heat source point, and the rotating pressure roller can press down the raised hole edge, so that the surface is flat after passing through the pressure roller 55, thereby improving the flatness of the PVC film wound on the roller during the subsequent winding process.

[0049] It should be noted that the inner cavity of the low-temperature roller sleeve 53 is connected to an external refrigeration device through a cold water pipe 52 , and cooling water is transmitted to the inner cavity of the low-temperature roller sleeve 53 to cool the low-temperature roller 54 .

[0050] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A processing device for punching easy-tear lines on PVC films, characterized in that: It comprises a feeding roller group (11), a first roller group (12), a second roller group (13) and a receiving roller group (14) for transmitting PVC film; The punching table (2) is arranged between the first roller group (12) and the second roller group (13); the laser punching mechanism comprises a laser table (32) arranged above the punching table (2); both ends of the laser table (32) are supported by brackets (31) installed at both ends of the punching table (2); and a plurality of laser punchers (33) are arranged at intervals at the bottom; The distance adjustment mechanism includes a distance adjustment platform (41) symmetrically arranged at the feeding position of the punching platform (2), a sliding groove is provided inside the distance adjustment platform (41), and a screw hole seat (42) with a screw hole is installed on the top, a stud (43) is connected to the internal thread of the screw hole seat (42), a slider (44) embedded in the sliding groove is provided below the stud (43), a pressure plate (45) is connected to the slider (44), a support plate (46) fixedly installed on the punching platform (2) is provided below the pressure plate (45), and a spring member (47) is installed between the pressure plate (45) and the support plate (46); The cooling mechanism comprises a cooling table (51) arranged at the discharge position of the punching table (2), the cooling table (51) having a built-in low-temperature roller sleeve (53), a low-temperature roller (54) arranged in a "U-shaped groove" of the low-temperature roller sleeve (53), a pressing roller (55) attached to the outer wall of the low-temperature roller (54) arranged below the low-temperature roller (54), and a transmission gap for the PVC film left between the pressing roller (55) and the punching table (2).

2. A processing device for punching easy-tear lines on PVC films according to claim 1, characterized in that: When the stud (43) pushes the slider (44) downward, the spring member (47) is in a compressed state under the influence of the thrust.

3. A processing device for punching easy-tear lines on PVC films according to claim 2, characterized in that: The pressing plate (45) and the distance adjustment platform (41) are slidably connected via the slider (44).

4. The processing device for punching easy-tear lines on PVC films according to claim 3, characterized in that: The feed ports of the pressing plate member (45) and the supporting plate member (46) are both "arc-shaped structures", and the ends of the pressing plate member (45) are the same "arc-shaped structures".

5. The processing device for punching easy-tear lines on PVC films according to claim 1, characterized in that: The low-temperature roller (54) and the pressure roller (55) are controlled by an external driving device to rotate synchronously.

6. The processing device for punching easy-tear lines on PVC films according to claim 5, characterized in that: The inner cavity of the low-temperature roller sleeve (53) is connected to an external refrigeration device through a cold water pipe (52).

7. The processing device for punching easy-tear lines on PVC films according to claim 1, characterized in that: A detachable waste box (21) is installed in the middle of the punching platform (2), and the slotted end surface of the waste box (21) faces the laser output end of the laser puncher (33).

8. The processing device for punching easy-tear lines on PVC films according to claim 7, characterized in that: The bottom of the waste box (21) is provided with a baffle of a "lead component", and the side wall is provided with an activated carbon strip.

9. The processing device for punching easy-tear lines on PVC films according to claim 1, characterized in that: The PVC film transmission angle between the second roller group (13) and the receiving roller group (14) is 10 to 30 degrees.

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