Low temperature cure wear resistant brightening process for packaging paper stereoscopic pearlescent texture

Abstract

This invention discloses a low-temperature curing, abrasion-resistant, and gloss-enhancing process for creating a three-dimensional pearlescent texture on packaging paper, relating to the field of packaging printing technology. The process includes: first, forming an uncured wet film containing flake-like effect pigments on the surface of a continuously moving paper base material, and establishing a reference area reflection benchmark and a control segment synchronization benchmark; then, using patterned orientation components to perform controlled contact orientation on the uncured wet film, and collecting multi-condition reflection characteristics of the same control segment before pre-curing to construct an orientation quality index; subsequently, adjusting the relative linear velocity difference, contact state, and pre-curing locking parameters based on the orientation quality index, position coding information, and control segment mapping relationship; finally, performing pre-curing locking and low-temperature full curing on the patterned oriented wet film. This process can maintain the consistency of the pearlescent texture under conditions of paper base absorption fluctuations and continuous production, while also considering surface high gloss, abrasion resistance, and anti-blocking properties.

Description

Technical Field

[0001] This invention relates to the field of packaging printing technology, specifically to a low-temperature curing process for achieving a three-dimensional pearlescent texture on packaging paper, resulting in a wear-resistant and brightening effect. Background Technology

[0002] Suitable for high-end paper boxes, gift packaging, cigarette packs, cosmetic outer boxes, etc., this paper-to-plastic alternative achieves a pearlescent, high-gloss appearance, as well as wear resistance and anti-sticking properties. Currently, common industrial methods include lamination / laser film composite, mechanical embossing, or partial varnishing. Alternatively, flake-effect pigments from curable varnishes can be added to uncured wet films to create oriented or patterned designs, resulting in a three-dimensional yet smooth embossed appearance. These solutions require compatibility with high-speed continuous production lines and are suitable for subsequent stacking, die-cutting, and box folding.

[0003] Chinese patent document CN118450951A discloses a coating method and system for forming a dummy embossing effect on a coil coating. In general, it involves applying a coating and a curable resin or pigment to a substrate in a wet layer manner, obtaining a pigment pattern in the wet layer; curing the wet layer to form a cured layer, ensuring the pigment pattern remains unchanged after curing and forming a dummy embossing. The system described in the document mainly includes a coating station for applying the wet layer, components for obtaining the pattern in the wet layer, and a radiation or heat source for curing. The components for obtaining the pattern are mainly a front rotating roller and a backing roller with textured surfaces, allowing the front roller to pass through the wet layer below it before curing to form the pattern. The pattern can be transferred to the substrate by methods such as sliding coating, curtain coating, roller coating, and gravure coating. Examples of parameters for the coating composition and cured layer are given, such as solid content, viscosity, type and content of flake pigments, and cured layer thickness, and the cured layer should be substantially uniform.

[0004] The above technologies can form pigment patterns on uncured wet films, which can be reproduced after curing to obtain virtual embossing. However, they still have certain limitations on high-speed paper-based in-line production lines. Changes in the absorbency and moisture content of paper / paperboard will cause differences in the solid content and viscosity of the wet film. Under the shearing action of the roll gap, the orientation of the flake-like pigments drifts with rheological changes, and the pattern contrast, edge sharpness, and width are unrelated. The low-temperature UV self-LED curing window is small, and pigment scattering and oxygen inhibition can lead to uneven curing. Adhesion and reduced abrasion resistance may occur in the stacked material. Increasing the curing energy or coating amount is constrained by the heat resistance, cost, and recyclability of the paper base. High-speed roll-to-roll lines may also experience tension fluctuations, roll surface runout, and banded unevenness and long-cycle drift caused by contamination and wear of textured components, which in turn leads to rework and fluctuations in yield.

[0005] Therefore, the urgent technical problem to be solved is: how to achieve stable reproduction of virtual embossed pearlescent orientation patterns under the constraints of high-speed continuous line connection, paper-based absorption / humidity changes and low-temperature UV self-LED curing, while taking into account properties such as high gloss, wear resistance and anti-blocking. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a low-temperature curing process for achieving a three-dimensional pearlescent texture in packaging paper, promoting wear resistance and enhancing gloss. This process utilizes patterned orientation components to implement controlled contact orientation of the uncured wet film. Before pre-curing, multi-conditional reflection characteristics of the same control segment are collected to construct an orientation quality index. Subsequently, based on the orientation quality index, position encoding information, and the mapping relationship of the control segment, the relative linear velocity difference, contact state, and pre-curing locking parameters are adjusted in a coordinated manner. Finally, the patterned and oriented wet film undergoes pre-curing locking and low-temperature full curing. This process maintains the consistency of the pearlescent texture under conditions of paper base absorption fluctuations and continuous production, while also considering surface gloss, wear resistance, and anti-blocking properties; thus solving the technical problems described in the background art.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: The low-temperature curing, wear-resistant, and brightening process for three-dimensional pearlescent texture of packaging paper includes forming an uncured wet film containing flake-like effect pigments on the surface of a continuously moving paper base material, maintaining the availability of tension, correction, and position coding signals, and obtaining reflection reference features under at least two observation conditions in the edge material of the roll or the reserved reference area, and dividing the control segment according to the position coding signal. An orientation pattern is formed on an uncured wet film using patterned orientation components, and reflection characteristics are collected under at least two observation conditions on the same control section before pre-curing. An orientation quality index is constructed based on the reflection reference characteristics. The orientation quality index is compared with the target range. Based on the position encoding signal, the measured control segment is mapped to the control segment to be adjusted, and the relative linear velocity difference, contact state and pre-curing locking parameters are adjusted in conjunction. Pre-curing and locking the patterned and oriented wet film according to the adjusted pre-curing and locking parameters, and then performing low-temperature UV LED full curing to output paper-based coated products.

[0008] Furthermore, the reflection reference features are obtained through a reference area set on the edge of the roll material or the reserved reference area. The reference area is recorded synchronously with the position coding signal during the continuous operation of the roll material. The control segment is continuously divided according to the longitudinal position corresponding to the position coding signal, and a one-to-one correspondence between the segment number and the position coordinate is established.

[0009] Furthermore, the patterned orientation component is in controlled contact with the uncured wet film when the uncured wet film is in a flowable state, and shearing is applied to the textured surface to form a spatially distributed orientation pattern; before pre-curing, the reflection characteristics under the first observation condition and the reflection characteristics under the second observation condition are sequentially collected on the same control segment. Furthermore, based on the reflection characteristics under the first observation condition, the reflection characteristics under the second observation condition, and the reflection reference characteristics, an orientation quality index is constructed by combining difference and ratio. The orientation quality index is then bound to the corresponding control segment number and position coding information to form a sequence corresponding to the segment number and the orientation quality index.

[0010] Furthermore, the orientation quality index is compared with the preset target range to obtain the deviation of the corresponding control segment; then, based on the position encoding signal, the longitudinal distance from the reflection feature acquisition position to the execution position, and the response delay of the actuator, the measured control segment is mapped to the control segment to be adjusted, and adjustment commands are generated for the mapped control segment.

[0011] Furthermore, the adjustment commands are applied to the patterning orientation stage and the pre-curing stage, respectively. Specifically, they include adjusting the relative linear speed difference between the patterning orientation component and the roll material, adjusting the pressing pressure and pressing gap in the contact state of the patterning orientation component, and adjusting the pre-curing time window, pre-curing energy ratio and triggering sequence in the pre-curing locking parameters.

[0012] Furthermore, a first adjustment sequence is adopted for the relative linear velocity difference, pressing pressure, and pressing gap, and a second adjustment sequence is adopted for the pre-curing time window, pre-curing energy ratio, and triggering sequence; and a change range limit and a change rate limit are set for each of the aforementioned adjustment quantities to constrain the adjustment continuity between adjacent control sections.

[0013] Furthermore, within the pre-curing time window, the uncured wet film with patterned orientation is pre-cured and locked, so that the orientation pattern maintains the boundary state of the corresponding control section before entering full curing; then, a low-temperature UV LED is used to fully cure the pre-cured and locked wet film, and the fully cured paper-based roll is continuously output to the winding station.

[0014] Furthermore, after full curing, reflection characteristics are collected again for at least some control segments according to the first and second observation conditions, and post-curing orientation quality indicators are constructed. The post-curing orientation quality indicators and orientation quality indicators are compared with each other for the same control segment, and the target interval and initial value of the adjustment command corresponding to the subsequent control segment are corrected accordingly.

[0015] Furthermore, when tension abnormalities, correction abnormalities, loss of position coding signals, or unstable wet film formation occur, the generation of new control segment adjustment commands is stopped; when reflection detection signals are abnormal, the actuator reaches the adjustment boundary, or the corresponding control segment continuously exceeds the target range, the current actuator output is frozen, and the relative linear velocity difference, contact state, and pre-curing locking parameters are reverted to preset conservative process parameters.

[0016] (III) Beneficial Effects

[0017] This invention provides a low-temperature curing process for achieving a three-dimensional pearlescent texture on packaging paper, which offers the following advantages:

[0018] An uncured wet film of effect pigment in the form of flakes is formed on the surface of a continuously moving paper-based material. At the same time, a reference area reflection benchmark and a control segment synchronization benchmark are established. The same position coordinates and reflection references are established in subsequent control segments, thereby eliminating the influence of differences in paper color, background image, and paper base absorption on subsequent orientation judgment.

[0019] Patterning and orientation are performed on the uncured wet film while it is still flowable. Before pre-curing, multi-conditional reflectance features are collected from the same control segment to construct orientation quality indicators. This transforms the orientation state of the flake-like effect pigment from an indistinguishable internal change to a traceable segment-level characterization, ensuring that the formation of the orientation pattern has an identifiable process basis.

[0020] By comparing the orientation quality index with the target range, and adjusting the relative linear velocity difference, contact state, and pre-curing locking parameters in conjunction with the position coding information and control segment mapping relationship, patterning orientation, orientation maintenance, and subsequent curing become a seamless adjustment chain, avoiding the problem that the front-end detection cannot be applied to the subsequent execution object during continuous production.

[0021] By first pre-curing and locking the uncured wet film after patterning and orientation, and then performing low-temperature full curing, the fixed orientation pattern is secured before relaxation and leveling occur. During subsequent crosslinking, the boundary state corresponding to the control segment is maintained, ensuring both stable presentation of the three-dimensional pearlescent texture and suitable temperature rise conditions for the paper-based material. This ensures that the input, processing, and output objects of each step are identical, while simultaneously resolving the issue of disconnect between orientation formation, orientation determination, execution adjustment, and curing within the same process chain. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the production line for the low-temperature curing, wear-resistant, and brightening process of the three-dimensional pearlescent texture of packaging paper according to the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the paper-based wet film formation, reference area establishment, and control segment division of the present invention.

[0024] Figure 3This is a partial cross-sectional schematic diagram of the patterned orientation component of the present invention applying contact orientation to a paper-based wet film;

[0025] Figure 4 This is a schematic diagram of the multi-conditional reflection detection and orientation quality index acquisition of the present invention;

[0026] Figure 5 This is a schematic diagram of the control segment numbering mapping and coordinated adjustment logic of the present invention;

[0027] Figure 6 This is a schematic diagram illustrating the segmented pre-curing locking, low-temperature full curing shaping, and post-curing testing of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-6 This invention provides a low-temperature curing, wear-resistant, and brightening process for creating a three-dimensional pearlescent texture on packaging paper, comprising:

[0030] The challenge of low-temperature curing, abrasion-resistant, and brightening processes for creating three-dimensional pearlescent textures on packaging paper lies not in applying varnishing materials containing flake-like effect pigments to the paper surface, but in the inherent differences in fiber orientation, absorption rate, surface density, base color, and image coverage of the paper base material itself. Furthermore, the stress and residence state of the flake-like effect pigments within the wet film are simultaneously affected by the wet film thickness, local viscosity, roll tension, and linear velocity. Therefore, when switching between coated paper, white cardboard, kraft paper, and recycled fiber paper under the same texture contact conditions, discontinuous pearlescent textures, brightness shifts, or localized unevenness often occur.

[0031] In this embodiment, all the following actions are executed in a coordinated manner by the production line controller, which is electrically connected to the roll material conveying unit, coating unit, reference area detection unit, position coding roller, and abnormal interlocking unit. The roll material conveying unit is responsible for flattening, traction, and correction; the coating unit is responsible for forming an uncured wet film; the reference area detection unit is responsible for collecting reflection reference features under at least two observation conditions at the edge of the roll material or in the reserved reference area; the position coding roller is responsible for outputting a position coding sequence that corresponds one-to-one with the roll material displacement; and the abnormal interlocking unit is responsible for cutting off the action permission of the orientation component and the curing component when tension is unstable, correction fails, or coding pulses are lost. Thus, step one not only completes material preparation but also establishes a unified input object, segment number object, and reference object for subsequent steps.

[0032] Step 1: The continuously moving paper-based roll and the curable varnishing composition containing flake-like effect pigments are combined to form a pre-processing object with a flowable paper-based wet film, repeatable position coordinates, and normalizable reflective references, so that the subsequent patterning orientation faces the controlled paper surface that has completed material preparation and coordinate preparation.

[0033] In this embodiment, the curable varnishing composition containing flake-like effect pigments preferably consists of a low-temperature curing oligomer, an active diluent, a wetting component, a smoothing and abrasion-resistant component, a photoinitiating component, and flake-like effect pigments. The flake-like effect pigments are preferably mica titanium pearlescent pigments, coated aluminum silver paste, silica-coated pearlescent flakes, or glass flake pearlescent powder. The paper-based material is preferably coated paper, cardboard, white cardboard, kraft paper, or recycled fiber paper. To avoid confusion in terminology, the continuously moving paper-based material is uniformly referred to as paper-based roll material, the uncured film layer formed on the surface of the paper-based roll material is uniformly referred to as paper-based wet film, the roll material edge or reserved reference area is uniformly referred to as reference area, the displacement sequence output by the position coding roller is uniformly referred to as position coding sequence, and the discrete segments divided according to the position coding sequence are uniformly referred to as control segments.

[0034] If the paper-based roll material has tension fluctuations, edge wobble, localized edge curling, or uneven absorption on the fiber surface before entering the coating unit, the paper-based wet film will simultaneously exhibit thickness fluctuations, localized dry edges, and pigment aggregation and dispersion when it is first formed. Even if the same texture is applied subsequently, it will be difficult to redirect the flake-like effect pigment under the same conditions.

[0035] Therefore, the roll material operation state is first limited to the range that can support the wet film, and then the wet film flowability and suspension are limited to the range that can support subsequent shearing and orientation, so that the paper-based wet film neither loses its flow immediately after coating nor levels out over a large area before entering the next unit.

[0036] The production line controller first reads the paper base type, linear speed, ambient humidity, tension feedback value, and edge deviation signal. Based on the paper base type, it calls the corresponding initial process setting and then drives the roll material conveying unit to stably feed the paper base roll into the coating unit. Subsequently, the coating unit forms a paper base wet film according to the initial process setting. Simultaneously, it continuously reads the post-coating surface state within a short path after the wet film is formed to determine whether the paper base wet film has entered the acceptance window required for subsequent patterning and orientation. Here, the acceptance window refers to the combined state where the paper base wet film simultaneously meets the requirements of continuous spreading, no gaps in coating, no significant pigment settling in the flake-like effect, and the surface still retaining flowability that can be moved by textured components.

[0037] Before entering the coating unit, the production line controller controls the unwinding roller, traction roller, and web guiding roller to form front and rear tension zones, and establishes a displacement sampling reference through the position coding roller. By arranging the position coding sampling point before the coating unit entrance and keeping it stable with the wrap angle of the roll material, the local slippage caused by the web guiding action can be avoided from mixing in the displacement amount, thereby fixing the displacement sampling and the coating start point on the same physical reference.

[0038] To ensure that subsequent steps use the same coordinate object, this implementation uses the initial position corresponding to the center line of the coating blade as the position origin. The cumulative number of pulses of the position coding roller Conversion paper-based roll current longitudinal position :

[0039]

[0040] Among them, the origin of the position : The longitudinal coordinate determined during initial calibration, with a fixed length value; encoding position. : No. The longitudinal coordinate at the time of the next sampling is a length quantity with a value not less than 0; the radius of the encoding roller. : Effective rolling radius of the position encoding roller, a positive real number; Number of pulses per revolution : The number of pulses per revolution of the position encoding roller, with a positive integer value; current pulse count. : No. The cumulative pulse count of each sample, a non-negative integer, records the current cumulative displacement; the initial pulse count... : The cumulative number of pulses during initial calibration, a non-negative integer, eliminating historical pulses before power-on.

[0041] The position coding roller is positioned in a stable wrap angle zone before the coating unit inlet, maintaining a constant wrap angle between the position coding roller and the paper base roll. The coding signal is output from an incremental encoder and input to the production line controller. The production line controller records the initial pulse count during startup calibration. As a zero-point reference, the current pulse count is read at a fixed sampling period during operation. When the pulse increment is zero and the production line speed signal is not zero for two consecutive sampling cycles, it is determined to be an encoding abnormality, triggering a safety mode that freezes the actuator output and triggers an alarm.

[0042] When switching from white cardboard to kraft paper, the production line controller reduces the unwinding acceleration slope to flatten the new paper roll first. Only after the position coding roller records the initial pulse number is the coating unit allowed to feed the material. In this way, all subsequent segment numbers are bound to the new physical paper surface, instead of using the old roll coordinates after the switch.

[0043] After the roll material is fixed at its origin, the coating unit applies the varnishing composition to the surface of the paper-based roll material. Preferably, the coating unit employs one of a reverse microgravure roller, a slit die, or a comma doctor blade; when the surface density of the paper-based material is high, a slit die is preferred to form a continuous wet film; when the surface absorption of the paper-based material is fast, a reverse microgravure roller combined with a short-dwelling reflux cavity is preferred to suppress localized material absorption.

[0044] This description does not focus on the equipment name itself, but rather on the wet film formation mechanism: after the varnishing composition leaves the feed port, it first forms a continuous liquid bridge, and then spreads into a paper-based wet film under traction. If the liquid bridge is too short, the high points of the paper fibers will absorb the low-viscosity component first and break the film surface; if the liquid bridge is too long, the flake-like effect pigments will accumulate in local reflow, both of which will destroy the subsequent orientation prerequisites.

[0045] In order to transform the wet film formation state into a identifiable object, this embodiment defines an orientation preparation coefficient. :

[0046]

[0047] Among them, orientation readiness coefficient The degree to which the paper-based wet film accepts subsequent patterning orientation is represented by a positive real number, coupling wet film thickness, pigment size, paper surface absorption influence, and viscosity recovery capability into the same judgment quantity; wet film thickness. The average thickness of the wet film on the paper base is a positive real number, reflecting the spatial orientation of the pigment in the thin-film effect; it is obtained by the difference between the online film thickness gauge, the laser triangulation rangefinder and the base paper reference surface, or by offline sampling inspection of the wet film roller;

[0048] Scale eigenvalue The equivalent planar dimension of the flake-like effect pigment is a positive real number, reflecting the space required for a single pigment flake to flip or lie flat; it is given by the incoming particle size report of the flake-like effect pigment used, or obtained from the median flake diameter by statistical analysis of microscopic images;

[0049] Suspension retention factor The suspension retention capacity formed by the wetting component, dispersing component and thixotropic component is a dimensionless quantity with a value greater than 0. A transparent sampling cup is set in the bypass of the feeding circuit. After the varnishing composition is left to stand for a preset residence time, the reflection intensity of the upper and lower layers is collected respectively. The ratio or difference is used to calculate the anti-settling ability of the flake-shaped effect pigment.

[0050] Absorption disturbance coefficient The strength of absorption of low-viscosity components in a wet film by a paper-based material is a dimensionless quantity not less than 0; viscosity recovery. The apparent viscosity of a paper-based wet film that recovers shortly after shear removal is a positive real number, representing the ability of the wet film to maintain the pattern boundary after texture contact; obtained by an online vibratory viscometer or bypass rotational rheological test after a fixed shear removal time.

[0051] Feed viscosity The apparent viscosity of the varnishing composition before entering the coating unit is a positive real number and serves as a normalized reference for viscosity recovery capability. It is measured by an online viscometer at the feed tank outlet.

[0052] In a preferred embodiment, the varnishing composition includes a wetting component to control spreading and a thixotropic component to control suspension. The former allows the varnishing composition to first cover the fiber peaks and valleys of the paper surface, while the latter prevents the flake-like effect pigments from settling due to short-term standing. For coated paper and white cardboard, the proportion of the wetting component can be relatively increased; for kraft paper and recycled fiber paper, it is preferable to first improve the thixotropic retention capacity and then compensate for spreading through the gap in the coating head. As a parallel extension, the flake-like effect pigments can adopt either a single-peak flake diameter distribution or a bi-peak flake diameter distribution, both of which follow the same orientation preparation coefficient. The judgment logic.

[0053] In use, the paper-based roll is first transformed into a controlled conveying object with a stable longitudinal coordinate, and the paper-based wet film is then transformed into an object to be oriented with flowability, suspendability, and acceptability; due to the orientation preparation coefficient... Simultaneously characterizing the paper surface absorption disturbance and the suspended state of the flake-like effect pigments, the subsequent second step can directly perform patterning orientation on the prepared paper-based wet film.

[0054] In the subsequent second step, an orientation quality index needs to be established based on the reflection difference of the same control section under at least two observation conditions. If a reference area reflection benchmark is not established first, the brightness and darkness changes sampled by the reflection detection unit will mix the paper base color, printed images and text, and local absorption spots, causing the subsequent orientation quality index to mistakenly take the paper color difference as the orientation difference.

[0055] Therefore, the object of reflection detection should be limited to a reference object that is as decoupled as possible from the paper color interference, and the physical positions of the reference object and the paper-based wet film should be mapped to the control segment number.

[0056] After confirming that the paper-based wet film has entered the receiving window, the production line controller first triggers illumination and acquisition under at least two observation conditions in the reference area to obtain the reference area reflection data, and then converts the reference area reflection data into a callable reflection reference. Subsequently, the production line controller divides the continuous roll into equal-length or variable-length control segments according to the position coding sequence, and writes the time sequence of each control segment and the reflection detection unit and orientation component that will pass through it into the segment number mapping table.

[0057] The reference area is preferably located on the edge of the roll material, the blank edge of the printed material, or a reserved strip without graphics or text. Its width is designed to accommodate a stable sampling spot under both observation conditions. The two observation conditions are preferably any one of two combinations of incident angles, two combinations of receiving angles, or two combinations of polarization states. Specifically, changes in the orientation of the flake-like effect pigment will cause a linked change in the specular composition and polarization response, while changes in the paper base color are mainly reflected in changes in the diffuse reflection base. The response trajectories of these two aspects differ under multiple observation conditions.

[0058] Therefore, this implementation defines a reference decoupling quantity. :

[0059]

[0060] Among them, the reference decoupling quantity The reference area is a normalized reflectance benchmark after weight correction under two observation conditions, and its value is a bounded real number; the first observed reflectance. The reference area, under the first observation conditions, collects the reflection intensity, which is a non-negative real number, providing the first channel response; the second observed reflection quantity... The reflection intensity of the reference area, acquired under the second observation conditions, is a non-negative real number, providing the second channel response;

[0061] Weighting factors Channel correction, a positive real number, compensates for the optical path difference, light source intensity difference, or detector gain difference between the two observation channels. During power-on calibration or batch switching calibration, the reference area is placed within the common field of view of both channels, and the responses of the first and second observation channels to the same reference area are collected. The controller calculates the weighting factor based on the average response ratio of the two channels. And it remains unchanged within that batch until calibration is triggered again; stability constant : Protection quantity, a small value greater than 0, to ensure reference decoupling quantity It can still perform stable calculations in low-reflection scenarios.

[0062] For example, when the roll material is packaging paper with locally dark printed graphics, the reference area is selected on the blank strip of the edge material. The controller first reads the two reflection values, and then applies the pre-calibrated weighting factor. Converted to reference decoupling quantity As a parallel extension, when there is insufficient space for edge materials, a strip without graphics or text can be reserved outside the main image area as a reference area; when the color of the edge materials is unstable, an alternating sampling method with left and right dual reference areas can also be adopted, which still belongs to the same concept in this step.

[0063] In reference decoupling quantity After establishment, the production line controller further discretizes the continuous roll material into callable control segments using the position coding sequence. The length of the control segment is preferably determined based on the contact length of the textured component, the longitudinal dimension of the reflection detection spot, and the response distance of the actuator. When the control segment is too long, multiple physical states may be mixed within a single control segment; when the control segment is too short, the controller has already switched to the next segment number before the actuator has had time to complete its action.

[0064] Therefore, the length of the control segment is determined according to the physical distance relationship between the detection unit and the execution unit, and the measurement sequence of each segment is written into the segment number mapping table.

[0065] Wherein, the length of the control segment is set to be The coordinates of the starting point of the segment are Then the first The control segment number to which the next sampling location belongs for:

[0066]

[0067] Among them, the control section number : No. The control segment number to which the next sampling position belongs is a positive integer, converting continuous roll material positions into discrete calling units; encoding position. : No. The longitudinal coordinate at the time of the next sampling is a length value that is not less than 0; the coordinate of the segment start point. The longitudinal coordinate at the starting point of the control segment division is a fixed length value.

[0068] Control segment length : The longitudinal distance between the boundaries of adjacent control segments, taken as a positive real number, determines the physical range borne by each segment; control segment length. It is determined by the largest of the following three factors: the longitudinal dimension of the reflection detection spot, the shortest effective contact length of the patterned orientation component, and the minimum resolvable action distance of the actuator.

[0069] In engineering implementation, the production line controller generates control segment numbers. Subsequently, the preceding mapping distance from the measurement segment to the execution segment is also synchronously written for direct invocation in subsequent steps two and three. When the tension sensor, correction sensor, or position encoding roller returns to an abnormal state, the abnormal interlocking unit immediately freezes the action permission of the orientation component and the solidification component, and retains the segment number mapping table that has been generated but not yet executed, to prevent the system from continuing to act on the erroneous paper segment under coordinate drift.

[0070] In practice, the reference area reflection datum isolates the paper base color and graphic variations from subsequent orientation observations, while the control segment number transforms the continuous roll material into discrete objects that can be accessed segment by segment in subsequent steps. Therefore, when constructing the orientation quality index in step two, the referenced quantity is no longer a sourceless, coordinateless, and referenceless reflection measure, but rather a reference-decoupling quantity from a specific control segment. The reflective characteristics.

[0071] Step 2: Process the paper-based wet film output from Step 1 according to the control section number. Implement patterned orientation and convert the multi-conditional reflection characteristics of the same control segment into orientation quality indicators with segment number assignments before pre-curing. .

[0072] In this embodiment, the execution entity in step two is still the production line controller. The production line controller first receives the paper-based wet film state and orientation preparation coefficient output from step one. Reference decoupling quantity With control section number Then, the patterned orientation components and the reflection detection unit are driven to coordinate their movements according to the same control segment rhythm. The so-called patterned orientation does not create a real, raised mechanical embossing, but rather, while the paper-based wet film is still in a flowable dynamic state, it alters the local shear field and local dwell field through contact surfaces with spatial texture differences. This causes the flake-like effect pigments to exhibit different flat angles, overlap densities, and orientation directions in different areas, thus creating a virtual embossing effect after subsequent full curing—a surface that feels basically flat to the touch but visually possesses a three-dimensional pearlescent undulation. The so-called orientation quality indicators... It is neither a normal brightness value nor a single color value, but rather a value based on the difference in reflection response under at least two observation conditions within the same control segment, combined with the reference decoupling value given in step one. The index obtained by normalization.

[0073] When flake-like effect pigments are dispersed within a paper-based wet film, their final visual intensity is not solely determined by the type of pigment, but is also controlled by the local force path. If the patterned orientation components simply press against the paper surface without establishing a stable relationship between relative speed, contact length, gap, and wet film thickness, the flake-like effect pigments will be forcibly piled up in localized areas, forming whitish streaks, or they will hardly be oriented and will only retain the appearance of a regular varnish layer.

[0074] Therefore, firstly, a contact field capable of converting wet film flow into directional orientation is established, and then this contact field is numbered with the control section. Bind segment by segment.

[0075] The production line controller is based on the control section number. The system calculates the moment when the current paper segment enters the contact area of ​​the patterned orientation component using a position encoding sequence. Then, it controls the texture component drive motor to accelerate the patterned orientation component to a working state with a preset relative speed difference between it and the paper-based roll material. A pressing gap adjustment mechanism establishes the contact length and contact pressure. As the paper-based wet film passes through the contact area, the textured surface transmits directional shearing force to the upper and middle parts of the film layer, causing the flake-like effect pigments to rearrange along local flow lines, and then form different degrees of flatness and overlap density in the corresponding areas of the texture peaks and valleys. If the wet film is directly treated with high-pressure short-contact, the flake-like effect pigments will be pushed as a whole instead of distributed according to texture differences, visually appearing only as ordinary indentations rather than a pearlescent texture.

[0076] The patterned orientation component preferably employs a texture roller with continuously distributed micro-convex textures and micro-grooves on its outer circular surface. This texture roller and the back pressure roller form a controlled contact pair. The surface layer of the texture roller is preferably a hard metal layer or a hard ceramic layer to prevent the texture edges from being dulled by the wet film after prolonged operation. The back pressure roller is preferably an elastic coating layer to absorb fluctuations in the thickness of the paper base material, ensuring continuous contact between the texture roller and different paper base materials. For white cardboard and coated paper, the texture depth of the texture roller can be varied by changing the peak radius using the same pitch. For kraft paper and recycled fiber paper, it is preferable to reduce abrupt changes in texture peaks and valleys to prevent high points on the fiber surface from cutting off the wet film of the paper base.

[0077] To convert texture contact states into callable quantities, this implementation defines an orientation-inducing quantity. :

[0078]

[0079] Among them, orientation induction amount : The intensity of the effective directional effect exerted by the patterned orientation component on the flake-like effect pigment within the current control segment, taking a positive real number; relative velocity difference The dimensionless quantity obtained by dividing the difference between the surface linear velocity of the patterned orientation component and the linear velocity of the paper-based roll by the linear velocity of the paper-based roll, can be positive, zero, or negative, and determines the shear direction and shear strength; it is obtained by directly subtracting the surface linear velocity of the patterned orientation component from the production line linear velocity and then normalizing it.

[0080] Contact length The effective contact arc length of the paper-based wet film between the patterned orientation component and the back pressure roll is a positive real number that determines the duration of the shearing action. It is calculated from the geometric relationship between the roll diameter, wrap angle, and pressing state, or measured offline from the length of the indentation contact zone. Orientation preparation coefficient. The wet film acceptance level output in step one is a positive real number, which incorporates the flowability and suspension properties of the paper-based wet film into this step.

[0081] Interface traction factor The traction transfer capability between the textured surface and the paper-based wet film surface is a dimensionless quantity with a value greater than 0. It is calculated by the difference between the no-load driving torque of the patterned orientation component and the material driving torque, combined with the current pressing gap, and reflects the dragging capability of the textured surface on the wet film.

[0082] Pressing gap The equivalent minimum gap between the patterned orientation component and the back pressure roller, taken as a positive real number, defines the pressure space of the wet film; wet film thickness. The average thickness of the paper-based wet film formed in step one is a positive real number, providing a reference for film thickness; elastic resilience factor. The comprehensive characterization of the morphological rebound of paper-based roll material and wet film after leaving the contact area is a dimensionless quantity with a value not less than 0; a short-distance re-inspection point is set after the exit of the patterned orientation component, and the texture response attenuation at the exit and the downstream fixed distance is compared to obtain the value.

[0083] In a representative embodiment, the production line controller reads the orientation preparation coefficient corresponding to the current paper segment. Next, the patterned orientation components are adjusted to have a relative speed difference with the paper-based roll material that has a fixed symbol. Then, the pressing gap is gradually approached by the pressing gap adjustment mechanism. When the paper-based wet film enters the contact area, a strong drag is formed in the area corresponding to the texture peaks, and a weak drag is formed in the area corresponding to the texture valleys. Thus, the flake-like effect pigments create a directional difference within the same control section. As a parallel extension, patterned orientation components can also be planar reciprocating texture plates, annular texture strips, or partitioned wrapping texture sleeves, as long as they can establish a connection with the control section number as the paper-based wet film passes through. Synchronous directional contact fields, that is, falling into the same technological concept.

[0084] Shear transfer alone is not enough to create a clear pearlescent texture. It is also necessary to establish a zoned dwell difference in the latter half of the contact area so that the thin flake-like effect pigments that have begun to turn are not smoothed out again by the subsequent overall leveling.

[0085] Therefore, in addition to peak-valley geometric differences, the textured surface of patterned orientation components preferably exhibits regional differences in surface energy and micro-roughness. For example, a higher surface energy hard layer can be used in the texture peak area to enhance short-term drag, while a lower surface energy coating can be used in the texture valley area to shorten the adhesion dwell time; alternatively, a uniform material can be used but the micro-roughness can be varied to make the liquid film splitting time in the peak area different from that in the valley area. In this way, when the paper-based wet film leaves the contact area, the flake-like effect pigments do not release simultaneously but detach in sections, thus preserving the pattern boundaries.

[0086] During this process, the production line controller does not directly obtain the complex flow field, but instead calls the pre-stored texture partition table according to the position encoding sequence and assigns the current control segment number. The control section is bound to the texture partitioning relationship. If the control section is located before or after the roll seam or in the loose fiber area at the edge of the paper base, the production line controller preferably reduces the surface drive amplitude of the patterned orientation component to prevent the edge paper fibers from dragging the wet film that has not yet been oriented into stripes.

[0087] In another embodiment, when the paper-based roll is made of recycled fiber paper, the operator can visually observe the same textured roller pressed onto the paper surface, but the pattern does not originate from the embossing; instead, it presents a pearlescent band that alternates between light and dark when rotated under light. Ultimately, this allows for both orientation and boundary differences within the same control section, providing identifiable objects for subsequent reflectance detection.

[0088] When in use, the current control section number The corresponding paper-based wet film is no longer an ordinary smooth wet film, but has formed a patterned orientation prestate that can be identified by multi-condition optical detection.

[0089] Although the patterned orientation pre-state has already shown changes in brightness when observed by rotating it with the naked eye, if the reflection value of a single angle is taken directly, it will still be affected by the combined influence of the paper base color, printing residue, instantaneous ripples of the wet film and light source attenuation. When adjusting it in the subsequent step three, it is easy to mistake non-orientation factors for orientation deviations.

[0090] Therefore, it is necessary to perform synchronous or quasi-synchronous data acquisition on the same control segment under at least two observation conditions, and utilize the reference decoupling quantity established in step one. Stripping away the background from the paper, the remaining directional response is then compressed into a single-valued index. .

[0091] Among them, the production line controller is based on the control section number. The arrival time of the paper-based wet film after leaving the patterned orientation component is tracked, and the polarization switching unit or the dual-angle illumination unit is controlled to trigger two observation conditions in sequence; the reflection detection unit collects two reflection intensities when passing through the detection field of view in the same control segment, forming a dual-channel reflection pair for that control segment; then the production line controller first converts the dual-channel reflection pair into a segment-level orientation response quantity, and then decouples it from the reference decoupling quantity in step one. Perform normalization and combine, outputting control segment numbers. Orientation quality index In practical engineering implementation, the two data streams can be obtained by the same detector working together to quickly switch illumination, or they can be obtained simultaneously by two sets of fixed-angle detectors.

[0092] The reflection detection unit preferably includes an illumination component, a receiving component, and a light-shielding component. The illumination component preferably uses a narrow-spectrum LED light source or a broadband light source with a filter to reduce ambient stray light; the receiving component preferably uses a linear array detector or a point detector array to collect local reflections along the width of the paper; the light-shielding component preferably forms a fixed measurement cavity to prevent intrusion from changes in external lighting. The two observation conditions are preferably a first incident angle combined with a first receiving angle and a second incident angle combined with a second receiving angle, or a first polarization state and a second polarization state. Since the contribution of the flake-shaped effect pigment to specular reflection and polarization components differs at different flat angles, the response difference of the same control segment under the two observation conditions can reveal the orientation direction.

[0093] To compress dual-channel data into a segment-level response that can be further processed, this implementation defines a segment-level orientation response quantity. :

[0094]

[0095] Among them, segment-level orientation response quantity : No. The normalized directional reflection difference of each control segment under two observation conditions, taking bounded real numbers, is used as the orientation quality index. Intermediate values; first channel weight : The gain correction coefficient of the first observation channel, which takes a positive real number, to compensate for the optical path loss and detection sensitivity of the first channel;

[0096] Second channel weight The gain correction factor for the second observation channel is positive to compensate for the optical path loss and detection sensitivity of the second channel; the first segment reflection... : No. The reflection intensity of the control segment is negative under the first observation condition, indicating a response in the first direction; the reflection amount of the second segment... : No. The segment control segment exhibits negative reflection intensity under the second observation condition, indicating a second-direction response; stability constant. Protection quantity, small quantity greater than 0, small denominator for low brightness segment.

[0097] In one embodiment, the reflection detection unit is positioned a short distance behind the patterned orientation member. As the paper-based roll passes by, the polarization switching unit first outputs a first polarization state, then a second polarization state. The linear array detector continuously acquires two frames of reflection signals for the same control segment, and the production line controller processes these signals according to the control segment number. After completing frame pairing and filling in the missing samples using linear interpolation, the segment-level orientation response was obtained. .

[0098] When the two observation channels adopt a time-division sampling method, the production line controller records the longitudinal coordinates corresponding to the sampling time of the first channel and the sampling time of the second channel, respectively, and according to the control section number... The two samples are mapped to the same control segment. If the two samples do not fall exactly at the same sampling time, the controller performs linear interpolation compensation for the longitudinal position of the later frame. The specific form of the linear interpolation function is: for the independent variable... In and When interpolating between endpoints, the interpolation result is taken as a weighted sum of endpoint values ​​proportional to distance. When two observation channels use spatial parallel sampling, the controller converts the longitudinal coordinates of the two channels to the same control segment number based on the geometric compensation table generated during installation and calibration. First channel weight. Second channel weight Both were obtained during power-on calibration based on the average response of the two channels in the same reference area.

[0099] Segment-level orientation response The residual bias still includes the paper base batch and the reference channel, therefore the reference decoupling amount established in step one is introduced. Normalization, compared to direct subtraction, adds a suppression factor during normalization so that high-contrast paper surfaces or local image trails will not produce overshoot at the output end. This is because ink edges and fiber fuzz often exist near the main image area of ​​packaging paper. If the dual-channel response of a certain control segment is too large at the same time, simple difference is used to amplify the background abnormality into the control link.

[0100] Therefore, this implementation defines orientation quality indicators. :

[0101]

[0102] Among them, orientation quality index : No. The final output of each control segment is the segment-level orientation effect index in step three, which is a bounded real number and serves as the direct feedback quantity for subsequent closed-loop regulation; segment-level orientation response quantity. The intermediate value obtained from the previous processing method is a bounded real number, which provides the dual-channel directional response for the current control segment.

[0103] Reference decoupling quantity Step 1 establishes a reflection reference in the reference area, with values ​​taken as bounded real numbers, eliminating paper base color and channel bias; suppression factor. Background anomaly suppression coefficient, a real number not less than 0, limits the amplification of the output by the anomalous reflection difference; observation sensitivity factor. The sensitivity factor, determined by the combination of observation conditions, is a positive real number that unifies different angle combinations or polarization combinations to the same output scale. (Observation Sensitivity Factor) The standard orientation sample is calibrated under the current observation angle combination or polarization combination, and is used to unify the response scale under different observation configurations to the same output scale. When the production line is configured with a reference area, the production line controller calls the reference decoupling quantity according to the above formula. Calculate the normalized orientation quality index When the production line is not configured with a reference area, the production line controller commands... The obtained orientation quality index will only be used for intra-segment comparisons under the same batch, paper type, and graphic coverage conditions, and will not be used for cross-batch target value inheritance.

[0104] When the two channels are time-division sampling, the controller uses the position encoding sequence as a reference to map the longitudinal coordinates corresponding to the sampling times of the first and second channels to the same control segment number, and completes the pairing of the two channels by using nearest neighbor or linear interpolation. When the two channels are spatially parallel sampling, the controller completes longitudinal coordinate compensation according to the geometric calibration table at the time of installation.

[0105] In engineering implementation, the production line controller obtains the orientation quality indicators. Then, immediately link it with the control section number. The corresponding longitudinal position and sampling time are written into the segment-level data queue and sent to step three in the order of entry. If a control segment experiences local saturation, light-shielding cavity contamination, or two-frame pairing failure during detection, the production line controller preferably uses the effective segment-level orientation response of the adjacent control segment. Short-range sequence-preserving interpolation is performed, and an anomaly flag is marked on the control segment to prevent single-segment bad values ​​from disrupting subsequent continuous adjustments. As a parallel extension, if the reflection detection unit adopts a dual-probe simultaneous acquisition structure, the controller does not require polarization switching; it only needs to register the responses of the two probes to the same control segment number according to the geometric calibration table. The orientation quality index was then calculated using the same formula. .

[0106] When using it, step three receives the control segment number. -Orientation quality indicators The sequence, rather than the raw, unprocessed reflection signal, provides a direct basis for subsequent adjustments to the relative speed difference, pressing gap, and pre-curing window.

[0107] Step 3: Analyze the orientation quality indicators output from Step 2. By control section number This is converted into targeted adjustment commands, which are then used to coordinately adjust the relative speed difference, pressing gap, and pre-curing time window of the patterned oriented components. This ensures that the paper-based wet film that subsequently enters the curing and locking zone maintains a repeatable orientation state.

[0108] In this embodiment, the following actions are still performed by the production line controller, which is electrically connected to the position encoding roller, the patterned orientation component drive motor, the pressing gap adjustment mechanism, the pre-curing trigger unit, the light source power adjustment unit, and the abnormal interlock unit. The production line controller receives the control segment number from step two. -Orientation quality indicators The sequence, combined with the current position, current linear velocity, actuator response delay, and remaining movement distance of the paper-based wet film before it locks, generates segmented adjustment commands for the control segments that will subsequently enter the patterned orientation component or pre-cured zone. It is emphasized here that each command must physically fall on the corresponding paper segment: the relative speed difference acts on the control segment that has not yet entered the texture contact zone, the pressing gap acts on the control segment that is about to enter the texture contact zone, and the pre-curing time window... This applies to control segments that have already completed patterning and orientation and are about to enter the pre-curing zone. If the timing is confused, even if a single action is correct, incorrect segment placement can disrupt texture consistency.

[0109] Among them, the orientation quality index obtained in step two This describes the section of paper-based wet film that has already undergone patterning and orientation. However, step three can actually influence another section of paper-based wet film that has not yet entered the orientation zone or the pre-curing zone. If this physical fact is ignored, although the controller will continuously output adjustment commands, these commands will arrive late or early, ultimately resulting in a disordered stripe period and a chase between the texture depths of the wide edges and the center.

[0110] Therefore, the segment number correspondence problem should be solved first, and then the adjustment requirements should be generated to ensure that the subsequent actions are not abstract corrections of deviations, but rather aligned with the subsequent physical paper segments.

[0111] The production line controller first reads the latest valid control segment number from the segment-level data queue. With orientation quality indicators The target orientation center value and allowable fluctuation range are then read from the process formula. Subsequently, based on the position coding sequence, current linear velocity, longitudinal distance from the detection unit to the patterned orientation component, longitudinal distance from the detection unit to the pre-curing zone entrance, and the response time of each actuator, the target control segments to which speed adjustment, pressing gap adjustment, and pre-curing trigger should be applied are calculated. Afterward, the controller converts the orientation offset of the current control segment into adjustment requirements and writes them into the speed requirement queue, gap requirement queue, and pre-curing requirement queue according to the target control segments, ensuring that all three queues originate from the same orientation quality index. However, the objects in each paragraph are distinct from one another and do not conflict with each other.

[0112] To avoid amplifying even minute fluctuations into frequent actions, the production line controller monitors the orientation quality indicators. First, offset shaping is performed, and then the shaped result is used as the upstream quantity for segment-level adjustment requirements. Instead of directly using ordinary proportional differences, a shaping method with limiting characteristics is introduced. This ensures that when the paper-based wet film only exhibits slight pearlescent oscillations, the controller maintains a smooth correction; when the paper-based wet film shows continuous deviation, the controller gradually increases the amplitude of action, but prevents a single adjustment from overshooting in the opposite direction. This process is suitable for situations where there are ink edges, paper fiber fuzz, and uneven local absorption near the main image area of ​​packaging paper, as these factors can affect the performance of individual control segments. If spikes occur and are not corrected, the mechanical actuator will fluctuate frequently in response to the spikes.

[0113] This implementation defines segment-level offset. :

[0114]

[0115] Among them, segment-level offset The current control segment's shaping offset relative to the target orientation center value is a bounded real number, serving as a common upstream quantity for speed requirements, gap requirements, and pre-curing requirements; orientation quality index. The segment-level orientation effect index output in step two is a bounded real number; the shaping suppression coefficient. Offset shaping coefficient, a real number not less than 0, to compress the impact of abnormal spikes on subsequent execution;

[0116] Target orientation center value The pre-defined segment-level target indicators in the process formulation, with bounded real numbers, serve as the comparison benchmark; the target orientation center value. The orientation quality index corresponding to the reference sample section whose appearance is confirmed to be acceptable during the trial run. The average value was written into the process formulation and used as the benchmark for comparison within the same paper type, formulation, and observation configuration. The absolute value operator in this paper... The specific form is defined as: when Time to take ,when Time to take This is used to make the shaping suppression depend only on the offset magnitude and not on the sign.

[0117] In a representative embodiment, when a control segment appears to have a darker pearlescent texture after passing the reflection detection unit, the production line controller will not immediately apply all the adjustment to the next segment. Instead, it will first adjust based on the segment-level offset. The amplitude is used to determine whether the deviation is a slow drift or a localized sudden change. If the deviation in the same direction persists in multiple consecutive control segments, the speed requirements and pre-fixing requirements in subsequent queues will accumulate segment by segment; if it is only a spike in a single control segment, then that segment will only generate a small action request after shaping. As a parallel extension, the target orientation center value... It can be set to a single fixed value, or multiple center values ​​can be set according to the paper width partition, but each partition still shares the same segment-level offset. The logic of plastic surgery.

[0118] Segment offset After generation, it cannot be directly sent to the actuator because the patterned orientation component, the pressing gap adjustment mechanism, and the pre-cured trigger unit have different physical positions.

[0119] To address this, the production line controller establishes target control segment mappings for the three types of actions. Specifically, the controller first reads the current linear speed based on the position encoding sequence, then combines the longitudinal distance from the detection unit to each execution position and the action completion time of each actuator to calculate how many control segments should be issued in advance for each type of action. In this way, the speed adjustment action can be completed before the paper-based wet film enters the texture contact area, the pressing gap adjustment action can be completed when the paper segment enters the pressing area, and the pre-curing trigger action can be opened or delayed when the corresponding paper segment reaches the entrance of the pre-curing area.

[0120] This implementation defines the target control segment number. :

[0121]

[0122] Among them, the speed target segment number Corresponding patterned orientation component drive motor; gap target segment number Corresponding pressing gap adjustment mechanism; locking the target segment number. Corresponding pre-cured trigger unit. Target control section number. : The control segment number that should be adjusted after the currently measured control segment corresponds to a certain execution position; the value is a positive integer; Control segment number The segment number used in steps one and two is a positive integer and serves as the starting point for mapping; production line speed. The current longitudinal running speed of the paper-based roll material is a positive real number. The time delay is converted into longitudinal displacement; action delay time. The response time of a certain actuator from receiving a command to the effective action, a real number not less than 0; the distance before contact. : The longitudinal distance from the detection position to the entry point of the execution position, a real number not less than 0, supplemented by the geometric space difference; control segment length. The control segment length defined in step one has a positive real number as its value.

[0123] Speed ​​target control section number Speed ​​correction for the drive motor of patterned orientation components, gap target control segment number Used for position correction of the pressing gap adjustment mechanism, locking the target control section number. Timing correction for pre-cured trigger units. Production line speed. Speed ​​is obtained from the traction roller speed sensor or the main drive encoder; speed execution delay time. Interval execution delay time and lock execution delay time All measurements were taken by each actuator during no-load and material-loaded testing; the longitudinal distance from the detection position to the speed execution position. Longitudinal distance from the detection position to the gap execution position Longitudinal distance from the detection location to the entrance of the pre-curing area All dimensions are determined by the equipment installation geometry. The production line controller generates these dimensions separately. , , This is to avoid segmentation errors caused by different implementing agencies sharing the same target segment number.

[0124] In specific operations, the production line controller preferably obtains the speed target control segment number, the gap target control segment number, and the pre-curing target control segment number separately, and combines the same segment-level offset. The write operation is split into three demand queues. For example, the detection unit detects the first... When the segment texture is too light, the speed requirement does not affect the first segment. Instead of being a segment, it acts on a target control segment number that has not yet entered the texture contact area. The pre-curing requirement applies to another target control segment numbered that has completed patterning and orientation but has not yet entered the pre-curing zone. If the production line is slowing down, the controller will recalculate. The corresponding mapping results avoid using the advance segment number under the old speed.

[0125] When using it, by taking the orientation quality index Transformed into smooth and constrained segment-level offsets Therefore, subsequent movements will not be affected by individual peaks.

[0126] Among them, adjusting the relative speed difference, adjusting the pressing gap, or adjusting the pre-curing time window separately are all possible. Only a portion of the orientation-forming chain can be reached. Adjusting only the relative speed difference may enhance dragging but not provide sufficient pressure constraint for the flake-like effect pigments; adjusting only the pressure gap may change the degree of contact but not address the relaxation after orientation formation; adjusting only the pre-curing time window... This could potentially freeze an orientation that has not yet been formed.

[0127] Therefore, it is necessary to consider speed adjustment as the precursor, gap adjustment as the contact constraint, and the pre-curing time window according to the effective position and physical action path. As a locking timing, control segment numbering around the same target. Coordinated allocation.

[0128] The production line controller reads the target control segment number that is about to take effect from the speed demand queue, the gap demand queue, and the pre-curing demand queue. And its demand, and then according to the pre-stored allocation rules, the segment-level offset. Decomposed into relative speed difference correction amount, pressing gap correction amount, and pre-curing time window. The controller then issues commands to each actuator in the following order: first speed establishment, then gap positioning, and finally pre-curing triggering. If an actuator is close to the mechanical boundary or the control section is marked with an abnormal interlock, the controller retains the other two types of actions and compresses the current action amplitude, so that the entire process remains continuous and does not stop due to the limitation of a single mechanism.

[0129] In this embodiment, the production line controller does not include segment-level offsets. Instead of distributing the work equally among the three execution ends, a layered allocation is made based on the physical action chain. For target control segments that have not yet entered the texture contact zone, it is preferable to primarily use relative velocity difference correction, as the relative velocity difference directly alters the shear transfer between the texture surface and the paper-based wet film. For target control segments that have just entered or are about to enter the texture contact zone, it is preferable to simultaneously apply a small-amplitude compression gap correction, as the compression gap determines the degree of contact and the confined space of the film layer. For target control segments that have completed patterning and orientation and are about to enter the pre-curing zone, it is preferable to adjust the pre-curing time window based on the formation results of the previous segment. This freezes the orientation pattern before it relaxes.

[0130] To express this hierarchical relationship as an executable variable, this implementation defines a collaborative allocation variable. :

[0131]

[0132] Among them, the amount of collaborative allocation Target control section number It can be used for speed correction, gap correction, and pre-curing time window. The modified combined effect is a bounded real number; segment-level offset. : The value is a bounded real number, representing the direction and magnitude that need to be corrected; orientation induction quantity In step two, the effective directional force intensity obtained from the contact state of the patterned orientation components is taken as a positive real number.

[0133] Assignment inhibition coefficient Cooperatively allocated shaping coefficient, with a value not less than 0, to limit excessive single-time correction under large deviations; elastic rebound factor. The comprehensive rebound characterization quantity defined in step two is a dimensionless quantity with a value not less than 0.

[0134] The controller allocates quantities collaboratively. For common input, the speed correction table, gap correction table, and lock correction table are queried separately to obtain the relative speed difference correction, pressing gap correction, and pre-curing time window correction.

[0135] In engineering implementation, the controller can coordinate the allocation of quantities. The specific execution quantities can be converted by looking up tables, or by piecewise linear interpolation to convert them into relative speed difference correction values, pressing gap correction values, and pre-curing time windows. Correction value.

[0136] For example: The production line controller pre-stores three one-dimensional piecewise linear lists, which are respectively the collaborative allocation quantities. Correspondence table with relative speed difference correction amount; Cooperative allocation amount Correspondence table with pressing gap correction amount; Cooperative distribution amount With pre-curing time window The table of corresponding correction amounts; all three tables were created offline from the test results of strips with the same paper base type and formula, and the controller was used during runtime. By performing linear interpolation on the independent variable, three types of execution quantities are obtained.

[0137] For example, when the amount of collaborative allocation When the orientation is maintained, the patterned orientation component drive motor first makes a large speed correction, the pressing gap adjustment mechanism makes a medium gap tightening command, and the pre-curing trigger unit makes a time window adjustment. The forward triggering ensures that this control segment is locked early, immediately after orientation is complete. As a parallel extension, if the equipment lacks an adjustable pressing gap structure, the same coordinated distribution amount can be used. It will only set the gap channel to zero at the execution end and make corrections through the speed channel and the pre-curing channel.

[0138] After layering and allocation, it is also necessary to prevent mechanical shock, stripe amplification, and the accumulation of miscontrols. To this end, the production line controller sets amplitude and slope boundaries for each actuator. Corrections for relative speed differences must not exceed the driving torque range that the textured components can withstand; corrections for the pressing gap must not exceed the minimum safe clearance required for variations in the thickness of the paper-based roll material; and pre-curing time windows... The forward or backward movement is not allowed to exceed the effective dwell zone of the paper-based wet film from the end of patterning orientation to before full curing. Meanwhile, if the reflection detection unit experiences optical window contamination, reflection saturation, or segment number matching failure, the controller will not allow the actuator to continue operating based on the distortion index, but will instead enter a degraded sequence: first freezing any new corrections after the current segment, then adjusting the relative speed difference, pressing gap, and pre-curing time window. Revert to the pre-stored conservative process setting, and if necessary, order the production line to slow down.

[0139] In one field implementation, when the operator discovers a small amount of coating residue on the surface of the patterned orientation component, the reflection detection unit will first show a local bright spot increase. After the production line controller identifies the segment number pairing imbalance between adjacent control segments, it will no longer allocate new cooperative quantities. Instead of pushing to the execution end, the rotation speed and pressing gap of the current patterned orientation component are kept constant and do not increase further, and the pre-curing time window is extended. Switch to a more conservative locking position. This way, while the production line temporarily stops tracking minor changes, continuous paper segments won't cause batch defects due to incorrect compensation. Once cleaning is complete and effective detection is restored, the controller will re-enable segment-level offset-based detection. The normal distribution chain. As another parallel extension, when the device is equipped with an independent light source power adjustment unit, the controller can also operate without changing the pre-curing time window. Under the premise of being in the center position, the locking intensity can be adjusted by shortening or extending the duration of the light source being turned on.

[0140] When in use, amplitude boundaries, slope change boundaries, and abnormal degradation order are added to the three types of actions so that the process chain will not lose its direction even if local detection distortion occurs or the execution end approaches the boundary in continuous production.

[0141] Step 4: According to the target control segment number given in Step 3 and pre-curing time window The paper-based wet film with patterned orientation is first pre-cured and locked in sections, then fully cured and shaped at low temperature. The cured results are then sent back according to the control section number as the basis for correction in subsequent batches or continuous production.

[0142] In this embodiment, the object processed in step four is no longer a regular dynamic photocoating layer, but a patterned orientation layer with segment-level offset. The paper-based wet film is adjusted according to its history. At this point, the paper-based wet film already possesses a pearlescent texture pre-state, composed of differences in the orientation, overlap, and boundary of the thin-film effect pigments. The production line controller first determines the target control section number. Identify the paper segment currently entering the pre-curing zone, and then allocate it according to the corresponding collaborative distribution amount. and pre-curing time window The triggering time, duration, and irradiation distribution of the paper segment within the pre-curing unit are determined. After pre-curing, the production line controller continues to guide the paper segment into the full curing unit according to the same control segment number, ensuring that it completes the final cross-linking without causing significant thermal curling of the paper-based roll material or inducing surface stickiness or re-adhesion. Afterward, the cured paper segment passes through the post-curing detection unit, where the controller recalculates the post-curing state to a segment-level quantity to determine whether the orientation pattern remains intact after locking until the finished product output stage.

[0143] Step three, although it has already taken into account the relative speed difference, pressing gap and pre-curing time window, The patterning orientation process was adjusted, but orientation formation does not equate to orientation retention. After the paper-based wet film leaves the patterning orientation component, a speed difference and stress release tendency still exist between the surface and middle layers of the wet film. The flake-like effect pigments will continue to swing back under local leveling, and the texture boundaries will become blunt due to surface shrinkage. Therefore, a pre-cured locking shell needs to be established within a short distance after the patterning orientation is completed, allowing the surface of the wet film to first obtain a structural support sufficient to constrain the flake-like swinging, and then handing over the remaining cross-linking task to the fully cured unit. If pre-curing is skipped and full curing is directly entered, the paper-based wet film will have already undergone irreversible regression during its movement before entering the fully cured zone. Even with strong subsequent irradiation, only the degraded state can be cured.

[0144] In this process, the production line controller first tracks the target control segment number based on the position coding sequence. Upon reaching the entrance of the pre-cured zone, the collaborative allocation amount generated for this control segment in step three is read again. and pre-curing time window Subsequently, the production line controller controls the pre-curing unit to illuminate the local LED array according to the trigger time corresponding to the paper segment, so that the pre-cured light spot covers the area where the patterning orientation has just been completed; when the paper-based wet film passes through the light spot, it first forms a surface confined shell, and then continues to move forward with the frozen pattern boundary. Since the pre-curing unit only undertakes the locking task and not the final curing task, its irradiation action emphasizes entering and exiting segment by segment, rather than continuously heating the entire paper surface for a long time.

[0145] The pre-curing unit preferably uses a long and narrow linear LED light source arranged along the machine direction, and is combined with a partitioned reflector to form a narrow-band irradiation area. This arrangement is chosen to control the section length. As defined in step one, if the pre-curing irradiation zone is too long, the action boundaries between adjacent control sections will overlap; if the pre-curing irradiation zone is too short, the paper-based wet film surface layer will leave the irradiation zone before forming a continuous shell.

[0146] Therefore, the production line controller numbers the target control section. The LED zone switches correspond one-to-one, ensuring that when each section of the paper-based wet film enters the irradiation area, its corresponding zone is illuminated. For white cardboard and coated paper, the pre-curing unit can be triggered at a more forward position to allow the surface layer to freeze as early as possible; for kraft paper and recycled fiber paper, the pre-curing trigger position is preferably slightly offset backward, allowing the paper fiber absorption to stabilize before shell formation, thereby reducing the pulling effect of local feed differences on the locking boundary.

[0147] To characterize the locking capacity of the pre-curing action on the current target control segment, this embodiment defines a locking retention amount. :

[0148]

[0149] Among them, the locking and holding amount Target control section number The ability to retain the patterned orientation pre-state after pre-curing, taking a positive real number; cooperative distribution amount. The combined effect obtained in step three is a bounded real number, incorporating the combined results of speed correction, gap correction, and pre-curing correction into this step; the pre-curing time window... The segment-level pre-curing time given in step three is a positive real number.

[0150] Elastic rebound factor The comprehensive springback characterization quantity defined in step two is a dimensionless quantity with a value not less than 0, used to describe the possible weakening of springback that may occur after the paper-based wet film leaves the contact area; lock-in inhibition coefficient. Pre-curing locking shaping coefficient, a real number not less than 0, is used to prevent large segment-level offsets. This can lead to excessively early or excessively prolonged pre-curing in a single process;

[0151] Segment offset The shaping offset obtained in step three is a bounded real number, representing the degree of orientation deviation that still needs to be corrected in the control section; the production line controller uses a locked holding value. To select the pre-curing setting; when When the temperature is below the lower limit, the controller prioritizes advancing the pre-curing time window. Or increase the opening time of the pre-cured stage; when When within the target zone, the controller maintains the current locked position; when When the temperature exceeds the upper limit, the controller will no longer enhance the pre-curing process to prevent the surface layer from hardening prematurely and affecting the next step of full curing.

[0152] In one field implementation, when the production line controller detects that a continuous paper segment has completed patterning and orientation and is about to enter the pre-curing zone, it first opens the corresponding LED partition, and then immediately closes the partition after the end of the paper segment leaves. The operator can see through the observation window that the paper surface remains flat and no actual indentation has formed, but under oblique light, the previously floating pearlescent boundary no longer moves, indicating that the pre-curing has frozen the orientation boundary within the wet film surface of the paper base. As a parallel extension, the pre-curing unit can use either a single-row LED linear array or a two-segment short-area LED array; the only difference between the two is the irradiation structure, both using the same locking and holding amount. As a basis for segment-level control.

[0153] After pre-curing and locking, although the paper-based wet film can maintain its texture boundaries, its internal cross-linking has not yet reached the level required for final abrasion resistance and anti-re-tack. Therefore, it needs to enter the full curing unit for further curing. The full curing unit preferably uses a multi-segment continuous LED array, with each segment arranged sequentially along the machine direction and independently startable / stoppable partitions in the paper width direction. The purpose of this setting is not to rebuild the orientation again, but to allow the wet film to transition from a surface shell state to a fully cross-linked state without damaging the already frozen pattern boundaries. If the starting position of the full curing zone is too far from the pre-curing zone, the paper-based wet film will still experience slight swaying of the incompletely frozen parts during the movement between the two zones; if the heat load in the full curing zone is too concentrated, the packaging paper base will experience warping, poor shrinkage, or interlayer adhesion during roll rewinding.

[0154] In practice, the production line controller determines the locking amount based on the locking value. and target control section number The irradiation sequence after the paper segment enters the fully cured zone is determined. Preferably, the front light segment completes the remaining surface layer crosslinking first, and the rear light segment then advances the middle and lower layers crosslinking, to avoid premature complete hardening of the surface layer, which would hinder the continued reaction of the deeper components. For thin paper bases and densely surfaced paper bases, the front LED array preferably uses a shorter on-time, while the rear array undertakes the main final curing function; for thick paper bases and loosely fibrous paper bases, the front array preferably maintains a relatively stable continuous irradiation, so that the upper and middle layers can be crosslinked simultaneously. Unlike the pre-curing unit, the fully cured unit no longer targets individual pattern boundaries, but rather the entire paper base wet film that has been pre-cured and locked. Therefore, its operation emphasizes continuous advancement after locking, rather than re-intervening in orientation formation. After full curing, the surface of the paper base coating remains smooth to the touch, the pearlescent texture exhibits stable light and dark levels under rotational observation, and the surface is no longer sticky, making it suitable for entering the winding unit.

[0155] When in use, the orientation state adjusted in step three will not revert on its own before entering full curing; by smoothly advancing the pre-cured paper-based wet film to the final cross-linking state, the finished product not only retains the pearlescent texture boundary, but also obtains the surface strength required for wear resistance and anti-re-adhesion.

[0156] During pre-curing and full curing, patterned orientation may still be affected by surface shrinkage, deep delayed cross-linking, and localized thermal load differences. If no inspection is performed after curing, it becomes impossible to distinguish between insufficient orientation formation and insufficient retention during the curing stage, and it also fails to provide a correction reference for subsequent paper segments in continuous production. Therefore, step four adds a post-curing re-inspection before finished product output, but this re-inspection still uses the control segment numbering system from the previous steps, without assigning new coordinates. In this way, the controller can measure the orientation quality indicators of the same paper segment before pre-curing. By comparing the final appearance with that after full curing, it can be determined whether the pattern formed in the previous steps was maintained during the locking and full curing stages.

[0157] Among them, the production line controller first tracks the target control segment number that has been fully solidified. Upon arrival at the post-curing detection unit, the post-curing reflection characteristics of the paper segment are collected under the same observation conditions as in step two. Subsequently, the controller converts the collected results into post-curing quality indicators and compares them with the orientation quality indicators recorded for the paper segment in step two. Perform segment-level mapping. If the relationship between the two is within the allowable range, the controller allows the paper segment to enter the finished product winding; if multiple consecutive segments are offset in the same direction, the controller will not change the completed paper segment, but will write the offset into the process correction cache of the subsequent paper segment for use in the allocation chain of the next round of step three.

[0158] The post-curing inspection unit preferably uses the same illumination angle combination or polarization combination as in step two to ensure comparability between the pre- and post-curing inspections. The difference lies in the fact that the post-curing inspection object has changed from a fluid paper-based wet film to a cured paper-based coating. Therefore, measures to prevent airflow disturbance in front of the inspection field of view are no longer needed to prevent wet film swaying; instead, the emphasis is on surface cleaning and stray light shielding before winding. The production line controller processes the multi-conditional reflectance values ​​collected by the post-curing inspection unit according to the same normalization path as in step two to obtain the post-curing quality indicators. Then, compare it with the orientation quality index recorded in step two by the control section. Comparison. The comparison here is not to negate the previous steps, but to distinguish between two cases: the formation of the preceding state is sufficient and the retention of the final state is insufficient, and the formation of the preceding state itself is insufficient.

[0159] To characterize the impact of the curing stage on segment-level pattern retention, this embodiment defines a retention offset. :

[0160]

[0161] Among them, maintain offset The orientation quality index of the same control section after full curing compared to before pre-curing The degree of offset is maintained, and the value is a bounded real number; post-curing quality index The post-curing testing unit obtains the segment-level quality index for this control segment, and the value is a bounded real number.

[0162] First define the segment-level response quantity, then solidify it:

[0163]

[0164] Among them, the first post-curing reflectance For the first The reflection intensity of each control segment under the first post-curing observation condition; the reflection amount under the second post-curing condition. For the first The reflection intensity of each control segment under the second post-curing observation condition; the weight of the first channel. Second channel weight and stability constant Keep this consistent with step two to ensure that the observation aperture is consistent before and after.

[0165] Redefining post-curing quality indicators:

[0166]

[0167] Post-curing quality indicators in step four The newly disclosed information is as follows: The post-curing detection unit collects the first post-curing reflectance of the same target control segment under two observation conditions similar to those in step two. Second post-curing reflectance The production line controller first calculates the post-curing stage response using the above formula. Then call the reference decoupling quantity obtained in step one. The background suppression coefficient used in step two and observation sensitivity factors The post-curing quality index is obtained using the above formula. To ensure Orientation quality indicators in step two They have the same normalization caliber.

[0168] Orientation quality indicators The segment-level index output in step two takes the value of a bounded real number; the suppression coefficient is maintained. Post-curing maintains the shaping coefficient, which is a real number not less than 0, to limit the amplification of subsequent correction cache by individual abnormal segments;

[0169] Among them, the post-curing detection unit collects the first post-curing reflection amount for the same target control segment. Second post-curing reflectance and according to the same channel weights as in step two. , Stability constant Reference decoupling quantity Background suppression coefficient and observation sensitivity factors Calculated post-curing quality indicators .

[0170] In one embodiment, after the same paper segment passes through the post-curing detection unit, the controller detects its post-curing quality indicators. Compared with previously recorded orientation quality indicators If the post-curing quality indicators of several consecutive segments remain basically consistent, then this segment is directly marked as a stable output segment; Deviation from previous orientation quality indicators in the same direction The controller writes this offset into the correction buffer of subsequent paper segments, rather than making corrections to paper segments that have already been wound up. As a parallel extension, the post-curing detection unit can be set between the exit of the full curing unit and the winding unit, or it can be set after the independent guide roller before winding. As long as it can still correspond to the same paper segment according to the original control segment number, it belongs to the same technical concept.

[0171] After obtaining the offset Then, the production line controller writes it along with the control segment number into the continuous production buffer. This buffer does not change the completed paper segment, but serves subsequent paper segments still in operation and the next batch of production tasks with the same formula. If the offset is maintained... If the anomaly is isolated within a short period, the controller should preferably maintain the current process setting to avoid causing additional disturbance to normal paper sections; if the offset is maintained... Maintaining the same directional offset across multiple consecutive control segments, the controller uses this as a boundary reference for the subsequent third step, appropriately adjusting the relative speed difference, pressing gap, or pre-curing time window. The initial value. At the same time, the finished product winding unit continuously winds according to the control section that has passed the re-inspection. The inter-roll separator or winding tension setting can be preset according to the paper type to prevent interlayer embossing of the high-gloss coating when it is just winding.

[0172] In continuous production, operators can directly observe that paper segments that have passed post-curing re-inspection remain smooth on the surface after entering the winding stage, with no obvious adhesion or dragging marks inside the roll. When rotating the sample sheet, the pearlescent texture exhibits stable layers, rather than becoming blurred or foggy in large areas as the viewing angle changes. If the post-curing detection unit, pre-curing unit, or full-curing unit experiences a continuous malfunction, the malfunction interlock unit will execute the exit judgment according to a preset sequence: first, freeze the new correction buffer write, then prevent the current execution end from continuing to amplify the action, and if necessary, command the production line to slow down or stop. In this way, even if the entire line needs to be interrupted, it will be interrupted while the completed paper segments maintain a traceable segment number relationship, without introducing a large number of abnormal paper segments of unknown origin at the end of the winding process.

[0173] When in use, it can distinguish between the problem of the formation of the preceding state and the problem of solidification and retention; therefore, the entire process chain forms a closed-loop continuity relationship of preceding state formation - segment locking - final state retention - subsequent correction in continuous production, without the need to reverse rework the completed paper segments.

[0174] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0175] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0176] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0177] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0178] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A low-temperature curing, wear-resistant, and gloss-enhancing process for three-dimensional pearlescent texture on packaging paper, characterized by: include, An uncured wet film containing flake-like effect pigments is formed on the surface of a continuously moving paper-based material, while maintaining the availability of tension, correction, and position coding signals. Reflection reference characteristics under at least two observation conditions are obtained in the edge of the roll or in the reserved reference area, and control segments are divided according to the position coding signals. An orientation pattern is formed on an uncured wet film using patterned orientation components, and reflection characteristics are collected under at least two observation conditions on the same control section before pre-curing. An orientation quality index is constructed based on the reflection reference characteristics. The orientation quality index is compared with the target range. Based on the position encoding signal, the measured control segment is mapped to the control segment to be adjusted, and the relative linear velocity difference, contact state and pre-curing locking parameters are adjusted in conjunction. Pre-curing and locking the patterned and oriented wet film according to the adjusted pre-curing and locking parameters, and then performing low-temperature UVLED full curing to output paper-based coated products.

2. The low-temperature curing, wear-resistant, and brightening process according to claim 1, characterized in that: The reflection reference feature is obtained by setting a reference area on the edge of the roll material or a reserved reference area. The reference area is recorded synchronously with the position coding signal during the continuous operation of the roll material. The control segment is continuously divided according to the longitudinal position corresponding to the position coding signal, and a one-to-one correspondence between the segment number and the position coordinate is established.

3. The low-temperature curing wear-resistant and brightening process according to claim 2, characterized in that: The patterned orientation component is in controlled contact with the uncured wet film when the uncured wet film is in a flowable state, and shearing is applied to the textured surface to form a spatially distributed orientation pattern; before pre-curing, the reflection characteristics under the first observation condition and the reflection characteristics under the second observation condition are collected sequentially on the same control segment.

4. The low-temperature curing wear-resistant and brightening process according to claim 3, characterized in that: Based on the reflection characteristics under the first observation condition, the reflection characteristics under the second observation condition, and the reflection reference characteristics, an orientation quality index is constructed by combining difference and ratio. The orientation quality index is then bound to the corresponding control segment number and position coding information to form a sequence corresponding to the segment number and the orientation quality index.

5. The low-temperature curing wear-resistant and brightening process according to claim 4, characterized in that: The orientation quality index is compared with the preset target range to obtain the deviation of the corresponding control segment; then, based on the position encoding signal, the longitudinal distance from the reflection feature acquisition position to the execution position, and the response delay of the actuator, the measured control segment is mapped to the control segment to be adjusted, and adjustment commands are generated for the mapped control segment.

6. The low-temperature curing wear-resistant and brightening process according to claim 5, characterized in that: The adjustment commands are applied to the patterning orientation stage and the pre-curing stage, respectively. Specifically, they include adjusting the relative linear speed difference between the patterning orientation component and the roll material, adjusting the pressing pressure and pressing gap in the contact state of the patterning orientation component, and adjusting the pre-curing time window, pre-curing energy ratio and triggering sequence in the pre-curing locking parameters.

7. The low-temperature curing wear-resistant and brightening process according to claim 6, characterized in that: The relative linear velocity difference, pressing pressure, and pressing gap are adjusted in the first order, while the pre-curing time window, pre-curing energy ratio, and triggering sequence are adjusted in the second order. The variation range and variation rate limits of the aforementioned adjustment values ​​are set respectively to constrain the adjustment continuity between adjacent control segments.

8. The low-temperature curing wear-resistant and brightening process according to claim 7, characterized in that: Pre-curing and locking are performed on the uncured wet film that has completed patterning and orientation within the pre-curing time window, so that the orientation pattern maintains the boundary state of the corresponding control segment before entering full curing. Subsequently, a low-temperature UV LED is used to fully cure the pre-cured and locked wet film, and the fully cured paper-based roll is continuously output to the winding station.

9. The low-temperature curing wear-resistant and brightening process according to claim 8, characterized in that: After full curing, reflection characteristics are collected again for at least some control segments according to the first and second observation conditions, and post-curing orientation quality indicators are constructed. The post-curing orientation quality indicators and orientation quality indicators are compared with each other for the same control segment, and the target interval and initial value of the adjustment command corresponding to the subsequent control segment are corrected accordingly.

10. The low-temperature curing wear-resistant and brightening process according to claim 9, characterized in that: When abnormal tension, abnormal correction, loss of position coding signal, or unstable wet film formation occurs, the generation of new control segment adjustment commands is stopped; when abnormal reflection detection signal occurs, the actuator reaches the adjustment boundary, or the corresponding control segment continuously exceeds the target range, the current actuator output is frozen, and the relative linear velocity difference, contact state, and pre-curing locking parameters are rolled back to the preset conservative process parameters.

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