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CN-121989553-A - Pressure and temperature cooperative control process method for embossment gold stamping of paper

CN121989553ACN 121989553 ACN121989553 ACN 121989553ACN-121989553-A

Abstract

The invention provides a pressure and temperature cooperative control process method for embossment gilding of a paper product, and relates to the technical field of paper product processing. The method comprises four steps of pretreatment of the paper, cooperative parameter matching, dynamic cooperative regulation and control, pressure maintaining, cooling and shaping, and is characterized in that a fuzzy PID control model embedded with a pressure-temperature cooperative compensation quantization formula is constructed, and accurate dynamic adaptation of temperature and pressure is realized. The formula uses the gram weight of paper, the depth of relief, the melting point of electrochemical aluminum and the initial temperature as parameters, calculates a pressure compensation value by combining a correction coefficient, and solves the problems of plate pasting, bottom exposure, relief deformation and the like caused by unbalanced temperature and pressure adaptation in the traditional process by matching with a zonal heating, gradient cooling and real-time quality feedback strategy. The embossing machine can be suitable for various paper products such as high-gram-weight paperboard, special texture paper, thin paper wound paper and the like and relief patterns with different structures, has high process standardization degree, remarkably improves the gold stamping quality and qualification rate of the paper wound paper products, and has wide industrial application value.

Inventors

  • Xie Suting

Assignees

  • 谢苏婷

Dates

Publication Date
20260508
Application Date
20260206

Claims (10)

  1. 1. The pressure and temperature cooperative control process method for embossment stamping of the paper is characterized by comprising the following steps of: the method comprises the steps of pretreatment of the tissue paper, namely surface cleaning and drying treatment are carried out on a target tissue paper, the water content of the tissue paper is controlled to be 6% -8%, and the surface flatness error is less than or equal to 0.02mm; the cooperative parameter matching is to establish a pressure-temperature cooperative control model based on the gram weight, the fiber toughness and the depth and the complexity of the embossed gold stamping pattern of the paper, and determine an initial process parameter interval, wherein the initial stamping temperature interval is 120-140 ℃, and the initial stamping pressure interval is 25-40MPa; The dynamic cooperative regulation and control comprises the steps of executing thermoprinting operation by adopting a numerical control gilding press, collecting temperature data of each region of a gilding plate in real time through a temperature sensor, collecting pressure distribution data of a stamping surface through a pressure sensor, synchronously regulating the pressure to +/-1-2 MPa when the temperature fluctuates to +/-5 ℃ based on the cooperative control model, and simultaneously controlling the pressure maintaining time to be 0.5-1s, so that dynamic compensation adaptation of temperature and pressure is realized; And (3) maintaining pressure, cooling and shaping, namely after finishing hot stamping, maintaining 80% of hot stamping pressure, cooling to below 60 ℃ in a segmented mode, and releasing pressure to obtain a finished embossment gold stamping product.
  2. 2. The process method according to claim 1, wherein the pressure-temperature cooperative control model is constructed by a fuzzy PID algorithm, and a pressure-temperature cooperative compensation quantization formula is embedded, so that accurate output of parameters is realized; The formula is as follows: ; wherein DeltaP is a real-time pressure compensation value (unit: MPa) and is used as one of the model core output parameters; g is the gram weight of the paper product of the Chinese wound, and the value range is 150-400G/m2; h is the depth of the relief pattern, and the value range is 0.3-0.5mm; T m is the melting point of the electrochemical aluminum foil, and the value range is 110-140 ℃; t 0 is the initial hot stamping temperature, and the value range is 120-140 ℃; K 1 is a gram weight correction coefficient, the value is 0.03-0.05, and the gram weight is increased linearly and gradually; K 2 is a relief depth correction coefficient, the value is 4-6, and the value increases linearly with the increase of depth; k 3 is a melting point temperature difference correction coefficient, and takes a value of 0.2-0.4 as a fixed coefficient; The model input parameters comprise gram weight of the paper, depth of relief pattern and melting point of electrochemical aluminum foil, the basic pressure compensation value is obtained through calculation of the formula, and then the final real-time temperature regulation value and the corresponding pressure compensation value are output through optimization of a fuzzy PID algorithm, and the model control precision is that the temperature is +/-1 ℃ and the pressure is +/-0.5 MPa.
  3. 3. The process method according to claim 1, wherein the initial process parameter interval is refined according to paper types, wherein Gao Kechong paperboard corresponds to 130-140 ℃ and has a pressure of 32-40MPa, special textured paper corresponds to 125-135 ℃ and has a pressure of 28-35MPa, and thin tissue paper corresponds to 120-130 ℃ and has a pressure of 25-32MPa.
  4. 4. The process method according to claim 1, wherein in the dynamic cooperative regulation, a zonal cooperative strategy is adopted for different areas of the relief pattern, wherein the temperature of edge and corner areas of the pattern is reduced by 3-5 ℃, the pressure is synchronously increased by 2-3MPa, and a planar area of the pattern maintains reference temperature and pressure, so that edge burning or planar bottoming is avoided.
  5. 5. The process method according to claim 1, wherein the pretreatment of the paper product further comprises surface coating treatment, wherein the thickness of the coating layer is 0.01-0.03mm, the paper product is dried at a low temperature of 45-55 ℃ after being coated, the drying time is 10-15min, the tight combination of the coating layer and paper product fibers is ensured, and the gold stamping adhesive force is improved.
  6. 6. The process method according to claim 1, wherein the gilding plate adopts a zoned heating structure, the heating units are in one-to-one correspondence with the embossment pattern areas, the temperature of each heating unit is adjusted through a cooperative control model, so that the temperature distribution uniformity error of the gilding plate surface is less than or equal to 2 ℃, and the heat requirement of the embossment structure of the paper is adapted.
  7. 7. The process method according to claim 1, further comprising a real-time quality feedback adjustment step of collecting glossiness and relief integrity data of the gold stamping finished product through a visual detection module, and automatically correcting parameters by a cooperative control model when the glossiness is lower than 85% or the relief defect rate is more than 1%, and raising the temperature by 2-3 ℃ or the pressure by 1-2MPa to form closed loop control.
  8. 8. The process method according to claim 1, wherein the pressure-maintaining cooling shaping adopts a gradient cooling mode, the cooling rate of the first stage is 10-15 ℃ per second, the maintaining pressure is 80% of the hot stamping pressure, the cooling rate of the second stage is 5-8 ℃ per second, the pressure is gradually relieved to normal pressure, and the deformation of the relief caused by thermal expansion and cold contraction of paper products is avoided.
  9. 9. The process method according to claim 4, wherein when the relief pattern comprises fine lines with the line width less than or equal to 0.2mm, a medium-temperature low-pressure long-time cooperative strategy is adopted, wherein the temperature is maintained at 125-130 ℃, the pressure is reduced by 2-3MPa, the dwell time is prolonged to 0.8-1s, and the edge gradient of the gold stamping plate is synchronously optimized to be 85-90 degrees, so that the lines are clear and free of burrs.
  10. 10. The process method according to claim 1, wherein the electrochemical aluminum foil is high-ductility resin-based electrochemical aluminum, and the cooperative control model performs parameter calibration on the difference of melting points of the electrochemical aluminum, wherein the melting point of the electrochemical aluminum is 110-120 ℃, the melting point of the electrochemical aluminum is reduced by 5-8 ℃ corresponding to an initial temperature, the pressure of the electrochemical aluminum is increased by 3-4MPa, the melting point of the electrochemical aluminum is increased by 130-140 ℃ corresponding to an initial temperature of 3-5 ℃ and the pressure of the electrochemical aluminum is reduced by 2-3MPa, so that the complete transfer of an aluminum layer and the forming of a relief are realized synchronously.

Description

Pressure and temperature cooperative control process method for embossment gold stamping of paper Technical Field The invention belongs to the technical field of processing of paper products, and particularly relates to a pressure and temperature cooperative control process method for embossing and gilding of paper products. Background The embossing gold stamping process is a core decoration technology in the processing of the paper products (such as greeting cards, bookmarks, gift box packages and the like), and the embossing gold stamping process is a key process for improving the added value of the paper products by pressing and heating the gold stamping plate to enable the electrochemical aluminum foil to be transferred to the surface of the paper products and synchronously form the embossing three-dimensional effect, and has both the attractiveness and the texture. With the rapid development of the literature industry, the requirements of the market on the precision, stereoscopic impression and suitability of paper embossment stamping are increasingly improved, and the traditional embossment stamping process gradually exposes a plurality of technical defects. The existing embossing gold stamping technology mostly adopts fixed temperature and pressure parameter operation, can only adjust parameters aiming at single type paper or simple patterns, and lacks dynamic adaptation capability for paper characteristics and pattern structures. The paper is large in material difference, fiber toughness, moisture content and thermal conductivity of high-gram-weight paperboard, special texture paper and thin Xuan paper are obvious, depth, line width and complexity of relief patterns are different, fixed parameters are easy to cause temperature and pressure adaptation unbalance, the relief is not clear when the pressure is insufficient for the high-gram-weight paperboard, the plate is easy to be burnt when the temperature is too high, paper damage is easy to be caused when the pressure is too high for the thin paper, electric aluminum transfer is incomplete when the temperature is too low, adhesive force is poor, and line definition and edge smoothness are not compatible for patterns containing fine lines in the traditional process, and burrs and broken lines are easy to occur. Partial improvement technology attempts to adjust temperature or pressure in a segmented mode, but most of the technology is empirically adjusted, a quantitative cooperative mechanism is lacked, accurate matching of temperature fluctuation and pressure compensation cannot be achieved, and the differential requirements of different areas (edges, planes and fine lines) of the relief pattern are not considered, so that the quality stability of a finished product is poor, and the qualification rate is low. In addition, the traditional process cooling stage is mostly natural cooling or one-time pressure relief cooling, and the problems that the paper product is easy to have relief deformation, aluminum layer is easy to fall off and the like due to thermal expansion and cold contraction further limit the application of the paper product in the processing of high-precision paper products. Therefore, developing a process method capable of realizing dynamic quantification and coordination of temperature and pressure, adapting to various paper products and patterns and improving the stability of gold stamping quality becomes an urgent need in the field of embossment gold stamping of the prior wound paper products. Disclosure of Invention In order to solve the technical problems, the invention provides a pressure and temperature cooperative control process method for embossment stamping of a paper-made product, which solves the technical problems that the temperature and the pressure in the traditional embossment stamping process of the paper-made product lack quantitative cooperative mechanism, have poor suitability, are easy to cause defects of plate pasting, bottom exposure, embossment deformation and the like, have low quality stability of finished products, and are difficult to meet the high-precision processing requirements of various paper products and complex embossment patterns. The pressure and temperature cooperative control process method for embossment stamping of the paper product comprises the following steps: the method comprises the steps of pretreatment of the tissue paper, namely surface cleaning and drying treatment are carried out on a target tissue paper, the water content of the tissue paper is controlled to be 6% -8%, and the surface flatness error is less than or equal to 0.02mm; The cooperative parameter matching is to establish a pressure-temperature cooperative control model based on the gram weight, the fiber toughness and the depth (0.3-0.5 mm) and the complexity of the embossed gold stamping pattern of the paper, and determine an initial process parameter interval, wherein the initial stamping temperature interval is 120-14