Roll paper and packaging machine thereof

Abstract

A roll paper packaging body comprises a roll paper body formed by winding long-strip-shaped paper and provided with a paper head and an outer packaging film layer wrapping the roll paper body, and the surface of the outer packaging film layer is provided with a peelable stripping strip defined by dotted tangent lines. The parallel dotted tangent lines and the arc-shaped dotted tangent lines are arranged on the outer packaging film at specific intervals to form the strippable strips, so that the position of a packaging opening is accurately controlled, and the packaging film has the advantages that a clear tearing guide line is provided, the packaging is convenient to open, the outer packaging film layer is prevented from being excessively broken, and printing ink is prevented from falling onto a paper roll when the film is torn. The utility model further provides a packaging machine for preparing the roll paper packaging body with the stripping strip defined by the dotted tangent lines, and therefore the opening convenience and the production qualification rate of the roll paper packaging body are improved.

Description

A roll paper and its packaging machine Technical Field

[0001] This application relates to the field of tissue paper packaging technology, and more specifically, to a roll of paper and its packaging machine. Background Technology

[0002] Currently, roll paper products on the market present numerous inconveniences during use. Traditional roll paper packaging typically uses a completely sealed outer film, requiring consumers to use sharp objects to open it upon first use. This opening method has several significant drawbacks: First, the lack of clear tear guide lines makes it difficult for consumers to accurately locate the tear point, often resulting in irregular tearing; second, excessive tearing force can cause large-area ruptures in the outer film, exposing the internal paper roll and affecting hygiene; third, using hard objects like fingernails poses a safety hazard of scratching fingers. Furthermore, existing roll paper packaging equipment is designed only for basic sealing functions, unable to achieve precise control over the processing of the outer film's perforated lines, particularly the simultaneous processing of parallel perforated lines with specific spacing and matching arc-shaped perforated lines during packaging. This technological limitation significantly hinders the production of roll paper products with easy-tear structures, failing to meet modern consumers' demands for ease of use. This technological deficiency in packaging equipment also directly limits the scope for innovation in the usability of roll paper products. Therefore, existing technologies urgently need improvement to address these issues. Summary of the Invention

[0003] The purpose of this application is to provide a roll paper and a packaging machine thereof, which has the advantages of providing a clear tear guide line, facilitating the opening of the packaging and avoiding excessive tearing of the outer packaging film layer.

[0004] The purpose of this application is to provide a roll paper and its packaging machine, which has the advantages of providing clear tear guide lines, facilitating the opening of the packaging, and avoiding the forced tearing of the roll paper packaging film, which would cause the film to deform arbitrarily and result in printing ink dripping onto the paper roll.

[0005] This application provides a roll paper, the technical solution of which is as follows: it includes a roll paper body with a paper head formed by winding a strip of paper and an outer packaging film layer wrapped around the roll paper body. The outer packaging film layer is characterized in that: the surface of the outer packaging film layer is provided with two first dummy tangent lines and a second dummy tangent line extending along the axial length direction of the roll paper, and two arc-shaped dummy tangent lines located at both ends of the first dummy tangent line and the second dummy tangent line; the distance between the first dummy tangent line and the second dummy tangent line is 2-10mm, and the first dummy tangent line, the second dummy tangent line and the arc-shaped dummy tangent lines at both ends together form a peelable strip.

[0006] Furthermore, this application also proposes that the length of the peeling strip is 0.6-1.0 times the axial length of the roll paper, and preferably, the length of the peeling strip is 0.8-1.0 times the axial length of the roll paper.

[0007] Furthermore, this application proposes that the first and second dummy tangents include cut portions and connecting portions, which are continuously and alternately distributed. The cutting depth of the cut portions is 70-100% of the thickness of the outer packaging film layer. The cutting depth of the connecting portions is 0-90% of the thickness of the outer packaging film layer. Preferably, the connecting portions are not cut (i.e., the cutting depth is 0% of the thickness of the outer packaging film layer). The length of the cut portions of the first and second dummy tangents is 1.0-3.0 mm, and the length of the connecting portions is 0.5-1.5 mm. Optionally, the cutting depth of the cut portions of the first and second dummy tangents is 100% of the thickness of the outer packaging film layer. The connecting portions of the first and second dummy tangents are not cut (the cutting depth of the connecting portions of the first and second dummy tangents is 0% of the thickness of the outer packaging film layer). Optionally, the arc-shaped dummy tangents at both ends are 100% cut lines.

[0008] Furthermore, this application also proposes that the surface of the peeling strip is provided with at least one tear-off portion, which can be a label or a conspicuous text mark.

[0009] Furthermore, this application also proposes that the distance between the first and second dummy tangents is 2-10 mm, and the diameter of the arc of the two end dummy tangents is equivalent to the distance between the first and second dummy tangents.

[0010] Furthermore, this application also proposes a method for preparing the aforementioned roll paper packaging machine, characterized in that: it includes a frame, on which a wrapping device for wrapping an outer packaging film onto a roll of paper is provided; on one side of the wrapping device is an outer packaging film supply device for feeding the outer packaging film thereto, and on the other side is a roll paper supply device for feeding the roll of paper thereto; a wrapped roll paper discharge mechanism is provided in the machine direction of the wrapping device; the outer packaging film conveying device includes a packaging film unwinding mechanism, a position adjustment mechanism, a slit opening mechanism, a packaging film cutting mechanism, and a film tearing conveying mechanism; the position adjustment mechanism is located after the unwinding mechanism, and the slit opening mechanism is located after the position adjustment mechanism and before the packaging film cutting mechanism.

[0011] Furthermore, this application also proposes that the virtual cutting opening mechanism includes a virtual cutting blade assembly and a transmission mechanism, wherein the virtual cutting blade assembly is connected to the transmission mechanism, and the position adjustment mechanism is connected to the transmission mechanism.

[0012] Furthermore, this application also proposes that the position adjustment mechanism includes a sensor, a servo motor, and a packaging film storage mechanism.

[0013] Furthermore, this application also proposes that the virtual cutting opening knife assembly includes a knife roller and a support roller. The knife roller includes a roller body and a cutting knife mounted on the roller body. The cutting knife is connected to a flexible substrate, and the flexible substrate is circumferentially connected to the knife roller.

[0014] Furthermore, this application also proposes that the height of the cutting blade is 2-2.5mm, the cutting blades are parallel to each other in the middle with a spacing of 2-10mm, and the two ends are arc-shaped.

[0015] As can be seen from the above, the present application provides a roll paper and its packaging machine, which includes a roll paper body with a paper head formed by winding a strip of paper and an outer packaging film layer wrapped around the roll paper body. By setting parallel dotted lines and arc-shaped dotted lines at specific intervals on the outer packaging film to form a peelable strip, the packaging opening position can be precisely controlled. It has the advantages of providing a clear tear guide line, making it easy to open the packaging and avoiding excessive tearing of the outer packaging film layer and causing printing ink to drip onto the paper roll. Attached Figure Description

[0016] Figure 1 is a schematic diagram of a roll paper provided by the present invention;

[0017] Figure 2 is a schematic diagram of a roll paper packaging machine provided by the present invention;

[0018] Figure 3 is a schematic diagram of a non-cutting blade in a roll paper packaging machine provided by the present invention.

[0019] In the figure, 1 represents a roll paper packaging body, 1A represents the roll paper body, 2 represents the outer packaging film layer, 21 represents the first dummy tangent line, 22 represents the second dummy tangent line, and 23 and 24 represent dummy tangent lines with rounded ends; 25 represents the peeling strip, 26 represents the tearing section, 4 represents the roll paper packaging machine, 40 represents the frame, 41 represents the wrapping device, 45 represents the roll paper supply device, 46 represents the roll paper packaging body discharge mechanism, 50 represents the outer packaging film supply device, 51 represents the packaging film unwinding mechanism, 52 represents the packaging film storage mechanism, 53 represents the sensor, 54 represents the dummy tangent opening mechanism, 55 represents the knife roller, 56 represents the support roller, 55A represents the knife roller body, 55B represents the cutting knife, 57 represents the packaging film cutting mechanism, and 58 represents the film tearing and conveying mechanism. Detailed Implementation

[0020] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. The term "axial length of the roll" refers to the dimension along the central axis of the roll, that is, the dimension along the height of the cylinder, which is the straight-line distance between the two end faces of the roll.

[0022] In existing technologies, the opening methods for the outer film layer of roll paper packaging generally suffer from inconvenience. Consumers need to use sharp tools or forcibly tear the film by hand to open it, a process that can easily lead to irregular tears in the film layer and even damage to the internal paper. In everyday use scenarios such as supermarkets and homes, packaging designs lacking effective opening aids often result in rough film edges and difficulty in controlling the tearing direction, directly impacting the user experience.

[0023] To address the aforementioned issues, the inventors conducted research on the tear mechanics of the film layer and discovered that existing packaging structures lack a pre-defined stress-guiding path. By analyzing the stress-deformation characteristics of the film layer, they considered incorporating weakening structures at specific locations to create a controllable tear trajectory. Further exploration revealed that setting parallel weakening lines in the axial direction, combined with an end-arc structure, can form a continuous tear-guiding path. This structural design can provide users with a clear starting point for force application and a tear direction while maintaining packaging integrity.

[0024] As shown in Figure 1, this application proposes a roll paper body 1A with a paper head formed by winding a strip of paper and an outer packaging film layer 2 wrapped around the roll paper body 1A. The surface of the outer packaging film layer 2 is provided with two first dummy tangent lines 21 and second dummy tangent lines 22 extending along the axial length direction of the roll paper, as well as two arc-shaped dummy tangent lines 23 and 24 located at both ends of the first dummy tangent line 21 and the second dummy tangent line 22. The distance between the first dummy tangent line 21 and the second dummy tangent line 22 can be, for example, 2 mm to 10 mm, and the first dummy tangent line 21, the second dummy tangent line 22 and the arc-shaped dummy tangent lines 23 and 24 at both ends together form a peelable peel strip 25.

[0025] The first and second virtual tangent lines 21 and 22 refer to discontinuous cutting lines formed on the surface of the outer packaging film layer. These can be achieved using a rotary die-cutting process, with the cutting depth controlled within a specific proportion of the film layer thickness. The arc-shaped virtual tangent line refers to an arc-shaped cutting trajectory formed at the end of the film layer. Its arc diameter is approximately equal to the distance between the first and second virtual tangent lines, used to connect the straight virtual tangent lines at both ends to form a closed profile. The peel strip is a film area enclosed by the virtual tangent lines, with a length range, for example, 0.6-1.0 times the axial length of the roll paper. This structure weakens the mechanical strength of local areas of the film layer, forming an easily separable opening path. The first and second virtual tangent lines 21 and 22 include a cutting portion and a connecting portion, which are distributed alternately and continuously. The cutting depth of the cutting portion is 70-100% of the outer packaging film layer thickness, and the cutting depth of the connecting portion is 0-90% of the outer packaging film layer thickness. The length of the cut portions of the first and second dummy tangents is 1.0-3.0 mm, and the length of the connecting portion is 0.5-1.5 mm. Optionally, the cutting depth of the cut portions of the first and second dummy tangents is 100% of the thickness of the outer packaging film layer. The cutting depth of the connecting portion of the first and second dummy tangents is 20-90% of the thickness of the outer packaging film layer. Optionally, the arc-shaped dummy tangents at both ends are 100% cut lines.

[0026] Cutting depth refers to the vertical depth to which the dummy cutting line penetrates the outer packaging film layer. This can be achieved by adjusting the pressure of the dummy cutting blade assembly or the blade height, creating a continuous and controllable cutting mark on the film surface. Outer packaging film thickness refers to the overall vertical thickness of the packaging film. Its uniformity can be controlled through film production process parameters or online thickness measurement equipment, providing a reference value for the cutting depth.

[0027] Specifically, when the outer packaging film layer is wrapped around the roll of paper, the dummy cutter assembly cuts the film with a preset pressure. The cutting depth is controlled within 70-100% of the film thickness, ensuring that the dummy cut line forms an effective weakening area, allowing the peel strip to be completely peeled off, while avoiding complete severing of the film and causing packaging seal failure. By precisely controlling the ratio of cutting depth to film thickness, the peel strip is ensured to break along a predetermined path during peeling, while maintaining the structural integrity of the unpeeled areas.

[0028] Compared to existing technologies, traditional packaging film dicing processes often employ a fixed cutting depth, failing to consider the impact of film thickness variations on peel performance. When film thickness fluctuates, cutting too shallowly leads to peeling difficulties, while cutting too deep may compromise packaging seals. This solution establishes a dynamic proportional relationship between cutting depth and film thickness, effectively adapting to thickness differences between different batches of film and ensuring the stability and reliability of the peeling operation.

[0029] Through the above technical solution, this application solves the problem of peeling failure caused by the difficulty in controlling the depth of the dummy cut in traditional roll paper packaging. When the user tears the peel strip, the film can break neatly along the dummy cut line, avoiding repeated tearing due to insufficient cutting depth, while preventing packaging damage caused by excessive cutting. This solution significantly improves the convenience and success rate of peeling operations while ensuring the sealing performance of the packaging.

[0030] Specifically, when a user applies external force along the peel strip, the weakened area formed by the dummy tangents breaks preferentially. Two parallel straight dummy tangents define the width range of the peel strip, while the arc-shaped dummy tangents ensure that the tearing process starts from the end and extends in a predetermined direction. Because the dummy tangents do not completely sever the film layer, the packaging remains airtight when unopened. When opening, the bond strength between the peel strip and the surrounding film layer is significantly lower than that of the film body, allowing the tearing process to proceed stably along the designed path.

[0031] Compared to existing technologies, traditional packaging films lack directional weakening structures, resulting in significant tearing force required for opening and uncontrollable tearing paths. This solution constructs geometrically distributed dummy tangents on the film surface, ensuring the tearing process always occurs along the pre-defined peel line boundaries. This structural design effectively prevents accidental breakage of the film layer in non-target areas while significantly reducing the force required for opening.

[0032] Through the above technical solution, this application achieves controllable opening of the film layer of roll paper packaging. When the user applies tension to the peel strip area, the film layer breaks neatly along the imaginary tangent trajectory, forming a regular opening edge. This design eliminates the safety hazards of using sharp tools to open the packaging, while also avoiding paper damage caused by excessive force. The peel strip structure provides the user with a clear position for applying force and the tearing direction, significantly improving the convenience and reliability of opening the packaging.

[0033] This application further proposes that the length of the peeling strip is 0.6-1.0 times the axial length of the roll paper, and preferably the length of the peeling strip is 0.8-1.0 times the axial length of the roll paper.

[0034] The peeling strip refers to the strip-shaped area formed by the first dummy tangent line, the second dummy tangent line, and the arc-shaped dummy tangent lines at both ends. Specifically, it can be achieved by adjusting the position parameters of the dummy tangent lines. The length range of this area is proportional to the axial length of the roll paper, so that the peeling operation area has sufficient space for force application while avoiding excessive damage to the packaging integrity.

[0035] Specifically, the peeling strip extends along the axial length of the paper roll, and its length is set to be 0.6-1.0 times the axial length of the paper roll, preferably 0.8-1.0 times the axial length of the paper roll. For example, when the axial length of the paper roll is 100mm, the peeling strip length can be 60-100mm, preferably 80-100mm; when the axial length of the paper roll is 200mm, the peeling strip length can be 120-200mm, preferably 160-200mm. The width of the peeling strip is the distance between the first and second dummy tangent lines. Furthermore, the two ends of the peeling strip smoothly transition to the edge of the paper roll through arc-shaped dummy tangent lines to avoid stress concentration that could lead to accidental breakage of the film layer.

[0036] Compared to existing technologies, current roll paper packaging films lack a peeling structure, requiring users to manually locate the application point, leading to uneven tearing or multiple attempts. This solution, however, defines a standardized operating area by limiting the ratio of the peeling strip length to the axial length of the roll paper. Users can directly identify the peeling strip location and apply force, significantly simplifying the process.

[0037] Through the above technical solution, this application can solve the problem of difficulty in tearing the outer packaging of existing roll paper. By optimizing the length and width range of the peel strip, it can ensure the integrity of the packaging film and provide a clear tearing guide area, reduce the complexity of user operation, and reduce the risk of damage to the roll paper caused by improper tearing.

[0038] This application further proposes a roll paper 1, including a roll paper body 1A formed by winding a strip of paper with a paper head and an outer packaging film layer 2 wrapped around the roll paper body. The surface of the outer packaging film layer is provided with two first dummy tangent lines 21 and second dummy tangent lines 22 extending along the axial length direction of the roll paper, and two arc-shaped dummy tangent lines 23 and 24 located at both ends of the first dummy tangent lines 21 and second dummy tangent lines 22. The distance between the first dummy tangent line and the second dummy tangent line is 2-10mm, and the first dummy tangent line 21, the second dummy tangent line 22 and the arc-shaped dummy tangent lines 23 and 24 at both ends together form a peelable strip 25. The surface of the peelable strip is also provided with at least one tear-off part, which can be a label or marking sticker.

[0039] Compared to existing technologies, current roll paper packaging films lack a clear tear-guiding structure, making it difficult for users to find the application point. This solution, however, establishes visual operating instructions through labels or markings on the tear section, and utilizes the cutting depth control of the dotted tangent line to achieve controlled peeling while ensuring packaging airtightness.

[0040] Through the above technical solution, this application solves the problem that existing roll paper packaging is difficult to tear accurately. By providing a clear force application point through the raised tearing part, combined with the position constraint of the symmetrical center line, the tearing action is always carried out along the predetermined path, reducing the risk of packaging damage caused by force deviation, and avoiding the operational trouble caused to users by repeated attempts to tear.

[0041] This application further proposes the preparation of a roll paper packaging machine 4, including a frame 40, on which a wrapping device 41 for wrapping an outer packaging film 2 onto a roll paper body 1A is provided. An outer packaging film supply device for feeding the outer packaging film is provided on one side of the wrapping device 41, and a roll paper supply device 48 for feeding the roll paper is provided on the other side. A wrapped roll paper discharge mechanism 49 is provided in the machine direction of the wrapping device. The outer packaging film conveying device includes a packaging film unwinding mechanism 51, a position adjustment mechanism, a slit opening mechanism 54, a packaging film cutting mechanism 57, and a film tearing conveying mechanism 58. The position adjustment mechanism is located after the roll film unwinding mechanism 51, and the slit opening mechanism 54 is located after the position adjustment mechanism and before the packaging film cutting mechanism 57.

[0042] The frame 40 refers to the main frame structure that supports the operation of the equipment, which can be implemented using a welded steel frame, providing an installation reference for each functional module. The wrapping device 41 is the functional unit that achieves the bonding and wrapping of the outer packaging film and the roll of paper, which can be implemented using a mechanical device with a drive roller assembly and a guiding structure to ensure uniform film wrapping. The outer packaging film supply device is a feeding system that continuously conveys film material to the wrapping device, which can be implemented using an unwinding roller in conjunction with a tension controller to ensure the stability of film conveying. The dummy-cut opening mechanism is a processing module that forms a predetermined cutting trajectory on the film surface, which can be implemented using a rotating roller assembly with adjustable blades, creating a dummy-cut line structure by controlling the cutting depth.

[0043] Specifically, when the roll of paper 1A enters the wrapping station, the outer packaging film 2 is unwound by the unwinding mechanism and its conveying path is calibrated by the position adjustment mechanism. The calibrated film enters the dot-cutting mechanism, forming two parallel dotted lines and an end arc-shaped tangent on its surface. The film, having completed the dot-cutting process, is cut to a preset length by the cutting mechanism and then pulled to the wrapping station by the film-tear conveying mechanism. The wrapping device precisely wraps the film around the surface of the roll of paper and outputs the finished product through the discharge mechanism. The entire process, through the coordinated operation of various functional modules, achieves automated wrapping of the outer packaging film with pre-cut dotted lines.

[0044] Compared to existing technologies, current packaging machines cannot form a pre-cut structure on the film surface, requiring manual post-processing. This solution, however, achieves automated film cutting trajectory processing by integrating a pre-cut opening mechanism and a position adjustment mechanism. Simultaneously, the linkage control between the film clamping and tearing conveyor mechanism and the packaging device avoids offset issues during film transport, improving processing accuracy.

[0045] Through the above technical solution, this application solves the technical problem that existing packaging machines cannot produce roll paper packaging with pre-cut dotted lines. By coordinating the dotted-cut opening mechanism with the conveying system, precise cutting and stable wrapping of the outer packaging film are achieved, effectively avoiding the inefficiency and quality fluctuations caused by manual operation. This device can continuously complete film unwinding, dotted-cut processing, and wrapping formation, significantly improving the production efficiency and product consistency of roll paper packaging.

[0046] This application further proposes a doubling opening mechanism for a roll paper packaging machine, including a doubling knife assembly and a transmission mechanism, wherein the doubling knife assembly is connected to the transmission mechanism, and the position adjustment mechanism is connected to the transmission mechanism.

[0047] The virtual cutting blade assembly 54 refers to a device used to form a preset cutting trajectory on the surface of the outer packaging film. Specifically, it can be implemented by a roller assembly with a cutting blade structure. The film is partially cut by the cutting blade to form a virtual cutting line, thereby providing an initial structure for the peel strip to be torn.

[0048] The transmission mechanism refers to the power transmission device that drives the virtual cutting blade assembly to achieve position adjustment. Specifically, it can be implemented by a combination structure of servo motor and gear, belt or linkage. The transmission mechanism controls the movement trajectory of the virtual cutting blade assembly to ensure the synchronization of the cutting position and the film conveying.

[0049] The position adjustment mechanism is a device used to dynamically adjust the position of the outer packaging film conveyor. Specifically, it can be achieved by using a sensor to detect the film offset and feeding it back to a servo motor to drive the storage roller to adjust the film tension. By adjusting the film position in real time, the accuracy of the cutting by the virtual cutting blade assembly is ensured.

[0050] Specifically, the dummy cutting blade assembly is linked to the position adjustment mechanism through a transmission mechanism. When a positional shift occurs during the outer packaging film transport process, the sensor in the position adjustment mechanism detects the shift signal and triggers the transmission mechanism to drive the dummy cutting blade assembly to move axially or radially, thereby compensating for the film shift. During this process, the dummy cutting blade assembly maintains a preset cutting distance from the film, ensuring that the cutting trajectories of the first dummy cutting line, the second dummy cutting line, and the arc-shaped dummy cutting line are continuous and symmetrical, ultimately forming a complete and closed peel strip structure.

[0051] Compared to existing technologies, current roll-to-roll packaging machines typically lack a linkage design between the dummy cutter assembly and the position adjustment mechanism. This makes the cutting position susceptible to changes in film tension or conveyor offset, leading to problems such as broken or misaligned dummy cut lines. This solution directly links the position adjustment with the dummy cutter's movement through a transmission mechanism, actively correcting film position deviations and preventing a decrease in cutting accuracy.

[0052] Through the above technical solution, this application solves the problem that existing packaging machines cannot stably produce roll paper outer packaging with precise dummy tangent structure, realizes dynamic synchronous control of dummy tangent opening and film conveying, and significantly improves the consistency of peel strip forming and packaging qualification rate.

[0053] This application further proposes a position adjustment mechanism including a sensor 53, a servo motor, and a packaging film storage mechanism 52.

[0054] Among them, the sensor refers to the device used to detect the positional offset during the delivery of the packaging film. Specifically, it can be implemented by photoelectric sensor or ultrasonic sensor. Its function is to monitor the positional status of the packaging film in real time and provide data support for subsequent adjustments.

[0055] Among them, the servo motor refers to the driving component that drives the packaging film to perform position compensation based on sensor signals. Specifically, it can be implemented using a closed-loop control system with an encoder. By precisely controlling the rotation angle of the motor, the axial position of the packaging film is ensured to be aligned with the cutting trajectory of the virtual cutting opening mechanism.

[0056] Among them, the packaging film storage mechanism is a device used to buffer the tension changes of the packaging film during the adjustment process. Specifically, it can be implemented by a floating roller or storage rack structure. By storing or releasing a certain length of packaging film, it compensates for the length difference caused by the servo motor adjustment and avoids the film from breaking or loosening.

[0057] Specifically, during the packaging film feeding process, sensors continuously detect the offset of the film edge and transmit the signal to the servo motor control system. When a positional deviation is detected, the servo motor drives the packaging film supply roller for fine-tuning, while the storage mechanism absorbs or releases the packaging film through the lifting and lowering action of the floating roller, maintaining the stability of the film tension. This process achieves automatic alignment of the packaging film before the virtual cutting station, ensuring that the virtual cutting line position of the subsequent cutting blade assembly is consistent with the design parameters.

[0058] Compared to existing technologies, current equipment typically relies on manual observation or mechanical limiting devices to adjust the packaging film position, making it difficult to respond in real time to film misalignment issues, leading to off-center cutting lines or uneven cutting depths. This solution, however, achieves high-precision automated adjustment through closed-loop control of sensors and servo motors, combined with dynamic compensation from the material storage mechanism, significantly reducing production failures caused by film position deviations.

[0059] Through the above technical solution, this application can effectively solve the problem of axial displacement caused by tension fluctuation or mechanical error during the conveying process of packaging film, and ensure that the shape and position of the peeling strip cut by the virtual cutting opening mechanism meet the predetermined requirements, thereby improving the ease of tearing the outer packaging film layer of roll paper, and improving the production stability and efficiency of the packaging machine.

[0060] This application further proposes a dummy cutting blade assembly including a blade roller and a support roller. The blade roller includes a roller body and a cutting blade mounted on the roller body. The cutting blade is connected to a flexible substrate, and the flexible substrate is circumferentially connected to the blade roller.

[0061] The cutter roller is a rotating component that carries the cutting blade. Specifically, it can be achieved by machining a groove structure on the surface of a metal roller, with a flexible substrate embedded in the groove to fix the position of the cutting blade.

[0062] The support roller is an auxiliary roller that works with the cutter roller to achieve cutting. Specifically, it can be a steel roller with an elastic material on its surface. The cutting depth is controlled by adjusting the pressure between the cutter roller and the support roller.

[0063] The flexible substrate refers to the connecting carrier that can deform elastically. It can be made of rubber or silicone material and is wrapped around the surface of the cutter roller in the circumferential direction. This allows the cutting blade to buffer when it comes into contact with the packaging film, avoiding rigid impact that could damage the film.

[0064] Specifically, a clamping area is formed between the cutter roller and the support roller, and the packaging film is pressed between them as it passes through. The cutting blade is fixed to the surface of the cutter roller by a flexible substrate. When the cutter roller rotates, the cutting blade forms a dummy tangent line on the surface of the packaging film in a flexible contact manner. The elastic properties of the flexible substrate allow the cutting blade to adapt to packaging films of different thicknesses while maintaining uniform cutting depth.

[0065] In some specific embodiments, the flexible substrate can be designed as an annular strip structure with multiple cutting blade mounting positions evenly distributed along the circumference of the blade roller. For example, the cutting blades can be made of stainless steel sheet by stamping and fixed to the surface of the flexible substrate by bonding or snap-fit.

[0066] Compared to existing technologies, traditional cutting mechanisms use rigid, fixed blades, which are prone to inconsistent cutting depths due to vibration during high-speed operation. The introduction of a flexible substrate effectively absorbs mechanical vibrations, ensuring the stability of the cutting trajectory. Simultaneously, the flexible contact method reduces wear on the support roller surface, extending the equipment's service life.

[0067] Through the above technical solution, this application achieves precise control of the dummy cutting line of the packaging film, avoids film breakage caused by excessive cutting or peeling difficulties caused by insufficient cutting, and significantly improves the production qualification rate of roll paper packaging machine.

[0068] This application further discloses a roll paper packaging machine, including a knife roller and a support roller. The knife roller includes a roller body and cutting blades mounted on the roller body. The cutting blades are connected to a flexible substrate, and the flexible substrate is circumferentially connected to the knife roller. The height of the cutting blades is 2-2.5 mm, and the cutting blades are parallel to each other in the middle with a spacing of 2-10 mm, and the two ends are arc-shaped.

[0069] The height of the cutting blade refers to the vertical distance from the tip of the cutting blade to the mounting surface of the flexible substrate. This height can be adjusted by changing the installation position of the blade roller. This height range ensures that the cutting blade penetrates the outer packaging film layer without damaging the inner paper roll. The parallel middle section refers to the middle section of the cutting blade forming two parallel straight lines. This can be achieved using CNC machining equipment, and the parallel spacing creates two parallel virtual cutting lines on the outer packaging film. The rounded ends refer to the curved shape of the two ends of the cutting blade, which can be manufactured using laser cutting technology. The rounded structure allows for a smooth transition at the corners of the virtual cutting lines.

[0070] Specifically, when the cutting roller and the support roller work together, the flexible substrate drives the cutting blade to roll and contact the surface of the outer packaging film. The parallel cutting blade in the middle forms two straight, imaginary cut lines with controllable spacing on the outer packaging film, while the rounded cutting blades at both ends create an arc-shaped connection structure at the ends of the imaginary cut lines. This combined cutting trajectory creates a closed peeling area through the imaginary cut lines, while preventing excessive cutting that could lead to accidental film detachment.

[0071] Compared to existing technologies, traditional packaging machines lack a specifically shaped cutting blade assembly and rely solely on a single blade for straight-line cutting, resulting in discontinuous or broken dummy cuts. This solution, through a specially designed cutting blade shape, creates a complete and closed dummy cut contour on the film layer, making the peel strip structure easier to identify and separate.

[0072] Through the above technical solution, this application solves the problem that traditional packaging machines cannot form peelable kerf lines, enabling the outer packaging film layer to have a pre-designed easy-tear structure. The shape parameters of the cutting blade ensure that the film layer is effectively cut while avoiding excessive cutting that could damage the packaging, thereby improving the ease of opening roll paper packaging and the production qualification rate.

[0073] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A roll of paper, comprising a roll body with a paper head formed by winding a strip of paper and an outer packaging film layer wrapped around the roll body, characterized in that: The surface of the outer packaging film layer is provided with two first and second dummy tangent lines extending along the axial length direction of the roll paper, and two arc-shaped dummy tangent lines located at both ends of the first and second dummy tangent lines; the distance between the first and second dummy tangent lines is 2-10mm, and the first and second dummy tangent lines and the arc-shaped dummy tangent lines at both ends together form a peelable strip.

2. The roll paper according to claim 1, characterized in that: The length of the peeling strip is 0.6-1.0 times the axial length of the roll paper.

3. The roll paper according to claim 1, characterized in that: The first and second dummy tangents include a cut-off portion and a connecting portion, which are distributed continuously and alternately. The length of the cut-off portion is 1.0-3.0 mm, and the length of the connecting portion is 0.5-1.5 mm.

4. The roll paper according to claim 3, characterized in that: The cutting depth of the cut portion is 70-100% of the thickness of the outer packaging film layer, and the cutting depth of the connecting portion is 0-90% of the thickness of the outer packaging film layer.

5. The roll paper according to claim 1, characterized in that: The surface of the peeling strip is also provided with at least one tear-off portion, which is a label or identification sticker.

6. A packaging machine for roll paper as described in claim 1, characterized in that: The device includes a frame, on which a wrapping device for wrapping outer packaging film onto a roll of paper is mounted. On one side of the wrapping device is an outer packaging film supply device that feeds the outer packaging film, and on the other side is a roll of paper supply device that feeds the roll of paper. A wrapped roll of paper discharge mechanism is located in the machine direction of the wrapping device. The outer packaging film conveying device includes a packaging film unwinding mechanism, a position adjustment mechanism, a slit opening mechanism, a packaging film cutting mechanism, and a film tearing conveying mechanism. The position adjustment mechanism is located after the unwinding mechanism, and the slit opening mechanism is located after the position adjustment mechanism and before the packaging film cutting mechanism.

7. A roll paper packaging machine according to claim 6, characterized in that: The virtual cutting opening mechanism includes a virtual cutting blade assembly and a transmission mechanism. The virtual cutting blade assembly is connected to the transmission mechanism, and the position adjustment mechanism is connected to the transmission mechanism.

8. A roll paper packaging machine according to claim 7, characterized in that: The position adjustment mechanism includes a sensor, a servo motor, and a packaging film storage mechanism.

9. A roll paper packaging machine according to claim 7, characterized in that: The slit cutter assembly includes a cutter roller and a support roller. The cutter roller includes a roller body and a cutting blade mounted on the roller body. The cutting blade is connected to a flexible substrate, and the flexible substrate is circumferentially connected to the cutter roller.

10. A roll paper packaging machine according to claim 9, characterized in that: The cutting blade has a height of 2-2.5mm, and the blades are parallel to each other in the middle with a spacing of 2-10mm, and the two ends are rounded.

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