Production method of waterproof pressure-resistant thermosensitive self-adhesive paper

Abstract

The invention relates to the technical field of self-adhesive paper production, in particular to a production method of waterproof pressure-resistant thermosensitive self-adhesive paper, which comprises the following steps: S1, monitoring and regulating coating parameters; s2, preparing and processing a thermosensitive coating material; s3, body paper treatment and coating; and S4, surface quality detection and correction. A plurality of sensors are arranged on a production line, key parameters in the coating process are accurately collected in real time and compared with target reference values, once data are abnormal, an automatic adjusting unit responds immediately, it is ensured that the production technology always conforms to strict quality regulations, physical properties of all parts of the product are kept consistent, and it is ensured that the quality of each batch of products is stable; the performance difference caused by production fluctuation is reduced; and by continuously observing the coating state, the problem is solved in time, the uniformity of the coating is ensured, and the phenomenon that the local part is too thick, too thin or uneven is avoided. The airflow speed and temperature and humidity are accurately controlled in the drying process, paper is prevented from being wrinkled and warped, and the appearance quality of products is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of self - adhesive paper production, and specifically to a production method of waterproof and pressure - resistant thermal - sensitive self - adhesive paper. Background Art

[0002] Thermal - sensitive self - adhesive paper is a special paper for information printing through thermal - sensitive printing technology. It will change color when encountering high temperature, thus realizing information printing. Thermal - sensitive self - adhesive paper usually consists of a thermal - sensitive coating, a base paper, and an adhesive layer. The thermal - sensitive coating is the core part, which contains thermal - sensitive materials and will undergo a chemical reaction when heated, resulting in a color change; the base paper provides support and protection; the adhesive layer is used to stick the thermal - sensitive paper to the surface of the required item.

[0003] Currently, during the production coating process of self - adhesive paper, due to the wear, deformation, or improper adjustment of the doctor blade of the coating equipment, the thickness of the thermal - sensitive coating and the amount of glue coating are uneven. In addition, due to improper control of environmental conditions such as temperature and humidity during the production process, the thermal - sensitive performance of the thermal - sensitive coating is also unstable. Moreover, during the production process of the base paper, due to uneven tension and inconsistent drying degree, there will also be problems with poor flatness, resulting in paper jams and wrinkling during the printing and pasting of labels. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a production method of waterproof and pressure - resistant thermal - sensitive self - adhesive paper, which solves the problems of uneven thickness of the thermal - sensitive coating, unstable thermal - sensitive performance, and paper jams and wrinkling during winding in the existing production process.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A production method of waterproof and pressure - resistant thermal - sensitive self - adhesive paper, comprising the following steps:

[0006] S1. Monitoring and Regulation of Coating Parameters

[0007] Deploy multiple sensors on the production line to accurately collect key parameters such as film thickness, speed, and humidity during the coating process. Transmit the signals to the central processor for analysis, compare the measured values with the target reference values. Once the data does not meet the standards, the automatic adjustment unit will take measures to ensure that the production process meets the quality requirements and maintains the consistency of product performance;

[0008] S2. Preparation and Processing of Thermal - Sensitive Coating Materials

[0009] In the preparation stage, the thermosensitive coating material is mixed according to the formula. The thermosensitive coating material includes a film-forming substance, a thermosensitive component, and a waterproof additive. After stirring evenly, the equipment parameters are adjusted, and the temperature and humidity in the workshop are controlled to create a stable environment for production. In the gluing process, a wire-wound rod coating or an automatic extrusion head coating method is used to evenly spray the coating material onto the surface of the substrate, and the coating state is continuously observed. Finally, after drying treatment, by setting the temperature gradient of the oven and controlling the air flow direction and speed, the wet initial form is transformed into a dry finished product.

[0010] S3. Base Paper Treatment and Coating

[0011] The base paper is first pretreated to adjust the tension to ensure flatness and water absorption performance. At the same time, surface treatment is carried out, and then it is transferred to the coating process. Using a stepping motor and a guiding roller, it is accurately positioned, and a die head scraping method is used to coat the working fluid containing a waterproof agent and an adhesive component. Finally, it is dried and cured in an environment with specific temperature, humidity, and air flow rate to ensure high-quality products.

[0012] S4. Surface Quality Inspection and Correction

[0013] Start the surface quality inspection device, use an optical imaging device to scan and photograph the label material, analyze the image data through an algorithm, and compare it with the predetermined standard. Once a problem that may cause paper jams or wrinkles is found, a correction command is sent to the winding system controller, and the error is corrected by adjusting the motor speed and the tension control system. The adjusted sample is repeatedly inspected until all label finished products meet the quality standards.

[0014] Preferably, the S1 step specifically includes the following processes:

[0015] Deploy multiple sensors on the production line to accurately collect key parameters during the coating process. Through a signal transmission line or a wireless communication module, the information is transmitted to the central processing unit for analysis and comparison. According to the formula F = K * (D - Do), the measured value D is compared with the target reference value Do to determine whether the actual working state meets the standard. Here, F is the change amount to be made, and K is a proportionality factor. If the thickness of the thermosensitive layer is lower than the standard, F is greater than zero, and it is corrected in the direction of increasing pressure.

[0016] Once unqualified data is detected, an instruction is sent to the automatic adjustment unit to implement corresponding measures. The above operations are continuously cycled to ensure that the production process meets the quality requirements.

[0017] Preferably, the S2 step specifically includes the following processes:

[0018] Configure the thermosensitive coating material according to the established formula and stir it evenly. Then, the equipment is debugged, the parameters of the precision control system are adjusted, and the workshop temperature and relative humidity are maintained within a predetermined range to ensure the stable formation of the thermosensitive coating film without defects caused by external interference.

[0019] Then the gluing process is carried out, the prepared thermal coating material is quantitatively sprayed onto the surface of the substrate through a precision nozzle, and evenly coated on the backing paper carrier to control the coating thickness, ensure the coverage while avoiding excessive thickness that affects the performance;

[0020] Finally, the drying process begins. The temperature gradient of the oven is set, and the temperature is increased from low to high, so that the residual solvent of the material can be gradually evaporated and the appearance of the material can be fixed.

[0021] Preferably, the S3 step specifically includes the following process:

[0022] The base paper is pre-treated first, and its tension is adjusted to an appropriate range through a tension sensor and feedback control system, while ensuring that the base paper has good flatness and appropriate water absorption performance. The surface is treated during the pre-treatment to avoid quality problems caused by improper tension.

[0023] Next, the conveyor belt driven by the stepper motor and the guide roller accurately deliver the prepared base paper to the coating process; the working liquid containing waterproofing agent and adhesive components is coated on the base paper using the die-head scraper method;

[0024] Finally, the coated paper sample is placed in a closed space with a specific temperature and air flow rate environment to dry and solidify.

[0025] Preferably, the S4 step specifically includes the following process:

[0026] Start the surface quality detection device, use the optical imaging device to scan and photograph the label material, and identify the appearance characteristics;

[0027] Process the shooting results, analyze the image information through algorithms, compare with the predetermined standards, and determine whether the label is flat;

[0028] Once a problem that may cause paper jams or wrinkles is found, a correction command is sent to the winding system controller to correct the error by adjusting the motor speed and tension feedback adjustment;

[0029] Check the surface of the adjusted sample again and repeat the above process until all labels meet the quality standards, and optimize the parameters of each link in a cycle to ensure that the quality of the self-adhesive materials leaving the factory is qualified.

[0030] The present invention provides a method for producing waterproof and pressure-resistant heat-sensitive adhesive paper. It has the following beneficial effects:

[0031] 1. The present invention deploys multiple sensors on the production line to accurately collect key parameters of the coating process in real time and compare them with the target reference values. Once the data is abnormal, the automatic adjustment unit responds immediately to ensure that the production process always meets strict quality regulations, maintains the consistency of physical properties of various parts of the product, ensures the stability of the quality of each batch of products, and reduces performance differences caused by production fluctuations.

[0032] 2. The present invention uses a tension sensor and a feedback control system to accurately adjust the tension during the pretreatment of the base paper to ensure flatness and water absorption performance, laying a good foundation for subsequent coating. In the coating process, a stepper motor and a guide roller are used to achieve precise positioning, and the die scraper method ensures that the coating thickness is consistent and can be flexibly adjusted, thereby improving production accuracy and efficiency. In the surface quality inspection link, optical imaging equipment and algorithms are used to analyze the label material in real time. Once problems that may cause paper jams or wrinkles are found, a corrective command is quickly sent to the winding system controller. The motor speed and tension system are adjusted to quickly correct errors, avoid problem accumulation, and improve production efficiency.

[0033] 3. The present invention continuously observes the coating status and solves the problem in time to ensure uniform coating and avoid local over-thickness, over-thinness or unevenness. The air flow speed and temperature and humidity are precisely controlled during the drying process to prevent paper wrinkles and warping, thus ensuring the appearance quality of the product. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example:

[0036] The embodiment of the present invention provides a method for producing waterproof and pressure-resistant heat-sensitive adhesive paper, comprising the following steps:

[0037] S1. First, multiple sensors are deployed in the production line to collect key parameters of the coating process, such as film thickness, speed, humidity, etc. The position of each sensor is precisely calculated to ensure that the collected data can represent the stability of the entire production process.

[0038] Then, the acquired information is transmitted to the central processor for analysis and comparison through the signal transmission line or wireless communication module. This processing step will determine whether the actual working state is consistent with the ideal value according to the pre-set standard. The formula is: F = K*(D-Do), where F refers to the change required (adjusted pressure or scraper movement distance), K is a proportional factor (usually between 0.8-1.2), D is the measured value, and Do is the target reference setting value (the two should be equal in the best case). When the measured thickness of the thermal layer is lower than the standard, it means that the coating quality needs to be improved, then F is greater than zero and is corrected in the direction of increasing pressure.

[0039] Furthermore, once non-conforming data is detected, an instruction will be sent to the automatic adjustment unit to implement corresponding measures. When the monitoring results indicate that there is excessive moisture in a certain section, causing uneven coating distribution, the control device will be promptly notified to appropriately reduce the feeding flow rate to make up for this difference; if it is found that the coating under the blade is too thick or too thin, the height position of the blade will be finely adjusted according to the specific situation, and the load applied to it will be adjusted synchronously. Specifically, during the production of self-adhesive labels, there may be a situation where the adhesive layer is locally missing. At this time, the pressing intensity of the blade needs to be immediately increased and its installation height slightly reduced.

[0040] Finally, the above operations are continuously cycled to ensure that the entire production process continuously meets strict quality regulations, maintain the consistency of the physical properties of each point on the thermal-sensitive layer and the adhesive surface, and achieve the output requirements of the best products.

[0041] S2. First is the preparation stage, in which the thermal-sensitive coating material is configured. This means mixing raw materials according to a predetermined formula, including various functional chemical components, solvents, and possibly added plasticizers, etc. In one embodiment, for waterproof and pressure-resistant thermal-sensitive self-adhesive paper, the formula may include a certain proportion of film-forming substances, thermal-sensitive components, waterproof additives, and other auxiliary materials, and after sufficient stirring, ensure uniform mixing.

[0042] Then enter the equipment debugging part, which involves adjusting the parameters of the precision control system to maintain an ideal production environment. This step requires ensuring that the temperature inside the workshop is maintained within a predetermined range and the relative humidity is between 45% - 55% to meet specific requirements. At the same time, monitor the feedback signal of the sensor to finely adjust the deviation amount in a timely manner until it stabilizes within a reasonable range, ensuring that the thermal-sensitive coating film can form the most stable structural characteristics in this environment without being affected by external factors to cause defects or variations.

[0043] Immediately following is the gluing process, in which the pre-prepared thermal-sensitive coating material is quantitatively sprayed onto the surface of the substrate through a precision nozzle device. Specifically, during the production of waterproof and pressure-resistant thermal-sensitive self-adhesive paper, the wire bar coating method can be used to thinly coat a uniform layer of coating on the backing paper carrier to carry the subsequent information display layer; or use an automatic extrusion head to apply a constant back pressure to stably discharge the coating fluid and form the required thickness during the continuous forward movement under tension, ensuring sufficient coverage without being too thick and greasy to avoid reducing flexibility or the risk of damage to other physical property performances. During the whole process, it is also necessary to continuously observe the coating state and make appropriate responses at any time to solve problems in a timely manner.

[0044] The last step is the drying process, where the important conversion process from the initial shape in the wet state to the finished state after drying is completed. The oven temperature gradient heating plan is set, and the transition from the lower inlet temperature zone to the higher outlet temperature zone is gradually made, so that the material is gradually heated to volatilize most of the residual solvent components and fix the good appearance of the already attached and formed form; and the airflow direction and speed in the entire drying room are precisely controlled to prevent the problem of wrinkles and warping caused by unbalanced force in local areas. When all the above procedures are completed, high-quality coated paper products with ideal thermal properties can be obtained.

[0045] S3. The base paper is first pre-treated to adjust the tension of the base paper to an appropriate range, and then enters the coating machine. Specifically, before entering the coating process, it is ensured that the base paper has good flatness and appropriate water absorption performance. In order to ensure a good combination of label paper and coating, a series of surface treatments such as dust removal and wetting will be carried out in the pre-treatment stage; tension adjustment uses tension sensor detection and feedback control system to adjust the stretching strength of both ends of the roll paper in real time, so that it is not easy to relax and avoid excessive tension that affects the quality of the finished product.

[0046] The prepared backing paper is then accurately conveyed to the coating process. In this process, a stepper motor drives the conveyor belt to advance the material at a stable speed, and guide rollers are used to achieve precise positioning and path planning. The coating method uses a die-head scraper method to apply a working liquid containing a mixture of waterproofing agent and adhesive components to the substrate. This method can ensure the consistency of thickness and can flexibly change the thickness of the coating layer according to needs.

[0047] Finally, the coated paper sample is placed in a closed space at a specific temperature to accelerate the evaporation of the solvent and water to reach a solidified state, completing a fast and uniform drying process. The air flow rate in this environment is controlled within the range of 0.5-1m / s, and the relative humidity is between 40%-60%, so that the product can always maintain a high quality level during the drying process and effectively reduce the probability of defects;

[0048] S4. First, start the surface quality detection device, use the optical imaging device to scan and photograph the label material, and identify its appearance characteristics.

[0049] The next step is to process the data of the shooting results. The information obtained from the image is analyzed by algorithms and compared with the predetermined standards to determine whether the label is in an ideal flat state.

[0050] Once a problem that may cause paper jams or wrinkles is detected, a corresponding correction command will be sent to the rewind system controller to correct the error by adjusting the motor speed, feedback regulation of the tension control system, etc. When wrinkles occur, the rewind tension can be increased to make the material tightly arranged; conversely, if excessive tension is detected, the tension should be appropriately reduced to avoid damaging the material or causing new defects.

[0051] Finally, check the surface state of the calibrated sample again to confirm the repair results, and repeat the above process until all label products meet the established quality standards. Optimize the parameters of each link continuously during this iterative verification process to ultimately ensure that each finished product leaving the factory is of high quality. This ensures that the entire production line produces qualified self-adhesive materials that are stable, consistent, and meet market demands.

[0052] The present invention comprehensively applies three core technical links: multi-sensor detection, intelligent control, and high-performance auxiliary facilities, and is equipped with strict and perfect on-site management measures to ensure the continuous and smooth operation of the entire production process. In this way, the long-standing technical problems existing in traditional manufacturing methods are successfully solved, providing high-performance self-adhesive printing materials with better quality and more trustworthy for customers in the market.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing waterproof and pressure-resistant heat-sensitive self-adhesive paper, characterized in that: The following steps are involved: S1. Coating parameter monitoring and control Multiple sensors are deployed on the production line to accurately collect key parameters such as film thickness, speed, and humidity during the coating process. The sensors are then transmitted to the central processor for analysis. The measured values ​​are compared with the target reference values. Once the data does not meet the standards, the automatic adjustment unit will take measures to ensure that the production process meets the quality requirements and maintains product performance consistency. S2. Preparation and processing of heat-sensitive coating materials In the preparation stage, the thermosensitive coating materials are mixed according to the formula. The thermosensitive coating materials include film-forming substances, thermosensitive components, and waterproof additives. After stirring evenly, the equipment parameters are adjusted, and the temperature and humidity of the workshop are controlled to create a stable environment for production. The gluing process adopts the mesh rod coating or automatic extrusion head coating method to spray the coating material evenly onto the surface of the substrate, while continuously observing the coating status. Finally, after the drying process, the wet initial form is transformed into a dry finished product by setting the oven temperature gradient and controlling the airflow direction and speed. S3. Base paper treatment and coating The base paper is first pre-treated, the tension is adjusted, the flatness and water absorption performance are ensured, and the surface is treated at the same time. Then it is sent to the coating process, and the stepper motor and guide roller are used for precise positioning. The die head scraper method is used to apply the working liquid containing waterproofing agent and adhesive components. Finally, it is dried and cured in a specific temperature, humidity and air flow environment to ensure the high quality of the product. S4. Surface quality inspection and correction Start the surface quality detection device, use the optical imaging device to scan and photograph the label material, analyze the image data through the algorithm, and compare it with the predetermined standard; Once a problem that may cause paper jams or wrinkles is found, a corrective command is sent to the winding system controller to correct the error by adjusting the motor speed and tension control system. The calibrated samples are checked repeatedly until all finished labels meet quality standards.

2. The method for producing a waterproof and pressure-resistant heat-sensitive adhesive paper according to claim 1, characterized in that: The S1 step specifically includes the following process: Deploy multiple sensors on the production line to accurately collect key parameters in the coating process; transmit information to the central processor for analysis and comparison through signal transmission lines or wireless communication modules. Compare the measured value D with the target reference value Do according to the formula F=K*(D-Do) to determine whether the actual working status meets the standard, where F is the change required and K is the proportional factor. If the thickness of the thermal layer is lower than the standard, F is greater than zero and correction is made in the direction of pressurization. Once substandard data is detected, instructions are sent to the automation adjustment unit to implement corresponding measures; The above operations are continuously repeated to ensure that the production process meets quality regulations.

3. The method for producing a waterproof and pressure-resistant heat-sensitive adhesive paper according to claim 1, characterized in that: The S2 step specifically includes the following process: Prepare the thermal coating material according to the established formula and stir it thoroughly; then debug the equipment and adjust the parameters of the precision control system to maintain the temperature and relative humidity of the workshop within the predetermined range to ensure that the thermal coating is stably formed and free from defects caused by external interference; Then the gluing process is carried out, the prepared thermal coating material is quantitatively sprayed onto the surface of the substrate through a precision nozzle, and evenly coated on the backing paper carrier to control the coating thickness, ensure the coverage while avoiding excessive thickness that affects the performance; Finally, the drying process begins. The temperature gradient of the oven is set, and the temperature is increased from low to high, so that the residual solvent of the material can be gradually evaporated and the appearance of the material can be fixed.

4. The method for producing a waterproof and pressure-resistant heat-sensitive adhesive paper according to claim 1, characterized in that: The S3 step specifically includes the following process: The base paper is pre-treated first, and its tension is adjusted to an appropriate range through a tension sensor and feedback control system, while ensuring that the base paper has good flatness and appropriate water absorption performance. The surface is treated during the pre-treatment to avoid quality problems caused by improper tension. Next, the conveyor belt driven by the stepper motor and the guide roller accurately deliver the prepared base paper to the coating process; the working liquid containing waterproofing agent and adhesive components is coated on the base paper using the die-head scraper method; Finally, the coated paper sample is placed in a closed space with a specific temperature and air flow rate environment to dry and solidify.

5. The method for producing a waterproof and pressure-resistant heat-sensitive adhesive paper according to claim 1, characterized in that: The S4 step specifically includes the following process: Start the surface quality detection device, use the optical imaging device to scan and photograph the label material, and identify the appearance characteristics; Process the shooting results, analyze the image information through algorithms, compare with the predetermined standards, and determine whether the label is flat; Once a problem that may cause paper jams or wrinkles is found, a correction command is sent to the winding system controller to correct the error by adjusting the motor speed and tension feedback adjustment; Check the surface of the adjusted sample again and repeat the above process until all labels meet the quality standards, and optimize the parameters of each link in a cycle to ensure that the quality of the self-adhesive materials leaving the factory is qualified.