A method for coating a hot melt adhesive by a hot melt adhesive coating compounder

Abstract

This invention discloses a coating method for a hot melt adhesive coating and laminating machine, relating to the field of coating and laminating technology. The steps are as follows: S1. Pre-operation preparation: verify production order information, collect and inspect the base paper and hot melt adhesive, and record material information; S2. Pre-start preparation: check equipment air pressure and safety devices, start the heating system before starting, and set the glue tank temperature to 160℃, coating head temperature to 180℃, glue delivery pipe temperature to 185℃, and metering pump temperature to 175℃; S3. Coating operation: after feeding the paper, feed the paper at a speed of 5m / min, manually remove glue until there are no air bubbles, switch to automatic mode, monitor the glue amount through a thickness gauge, adjust the coating head screw to control the glue amount, and start the machine to coat the adhesive. This invention adopts a zoned precise temperature control strategy, setting dedicated temperature parameters for key parts of the glue tank, coating head, and glue delivery pipe, and preheating for 3 hours in advance to avoid uneven heating of the hot melt adhesive and abnormal viscosity caused by local overheating, ensuring stable adhesive performance during the coating process.

Description

Technical Field

[0001] This invention relates to the field of coating and laminating technology, specifically to a coating method for a hot melt adhesive coating and laminating machine. Background Technology

[0002] Hot melt adhesive coating and lamination is a core process in the production of thermal paper products. Traditional coating methods suffer from numerous technical defects due to non-standard operating procedures, low precision in temperature and adhesive volume control, and untimely quality monitoring. For example, the hot melt adhesive heating system lacks precise temperature control in different zones, easily leading to localized overheating or uneven heating, resulting in abnormal adhesive viscosity and affecting the coating effect. Furthermore, the adhesive volume adjustment lacks real-time monitoring methods, relying entirely on manual experience, leading to large fluctuations in adhesive volume and problems such as excessively high or low adhesive volume, or insufficient adhesive width. To address these issues, we propose a coating method using a hot melt adhesive coating and laminating machine. Summary of the Invention

[0003] To solve the above-mentioned technical problems, a coating method for a hot melt adhesive coating and laminating machine is provided. This technical solution solves the problems of uneven adhesive application, unstable temperature, frequent production failures, and high defect rate.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for applying adhesive using a hot melt adhesive coating and laminating machine, comprising the following steps:

[0005] S1. Before the operation, review the production order information, collect and inspect the raw paper and hot melt adhesive, and record the material information;

[0006] S2. Before starting the machine, check the equipment air pressure and safety devices. Before starting the machine, start the heating system and set the glue tank temperature to 160℃, the coating head temperature to 180℃, the glue delivery tube temperature to 185℃, and the metering pump temperature to 175℃.

[0007] S3. Glue application operation: After feeding the paper, feed the paper at a speed of 5m / min, manually remove the glue until there are no air bubbles, switch to automatic mode, monitor the glue amount through the thickness gauge, adjust the coating head screw to control the glue amount, and start the machine to apply glue.

[0008] S4. Quality control: Production begins after the first piece passes inspection. The machine status is checked every half hour, and the width and amount of adhesive are checked after each roll is unwound.

[0009] S5. Equipment maintenance: Replace the filter screen of the plastic box every 3 days, and calibrate the machine level and clean the cooling system monthly.

[0010] Preferably, in step S1, the operator prints the raw and auxiliary material requisition form from the PMC material handler based on the order information and submits it to the warehouse for raw and auxiliary material requisition; after receiving the materials, the materials are counted, and the color, weight, width and quantity of the raw paper are checked to ensure they are consistent; the quantity, type, color and odor of the glue are checked.

[0011] Preferably, the step S3, where the paper is fed at a speed of 5 m / min after insertion, is as follows:

[0012] After adjusting the machine to normal working condition, use paper guide ropes to stick the ends of the bottom paper and pass them through each paper feed roller and the bottom paper composite roller.

[0013] Pull the paper guide rope at the glue coating and laminating roller and pull the bottom paper from the top paper end to the laminating roller position;

[0014] Press the communication bell on the control panel to prepare the machine for normal start-up. Turn on the single-action switch to let the paper move until the bottom paper is pulled to the laminating roller for lamination.

[0015] After removing the paper guide rope and bonding the bottom paper together, use the paper guide rope to stick the bonding area of ​​the bottom paper. After passing through the composite, follow the paper guide rope to the winding end according to the paper diagram of the coating machine.

[0016] Pull the paper guide rope and feed the paper at a speed of 5m / min. Once the paper is in the correct position and reaches the winding point, wrap the paper around the winding steel roller with tape attached.

[0017] Preferably, the manual degumming step in step S3 until no air bubbles are present is as follows:

[0018] Set the operating parameters of the glue applicator, and discharge the glue from the coating head in manual mode. Stop discharging the glue when it flows out evenly without any air bubbles. After discharging the glue, set the glue applicator to automatic mode. Ensure there are no impurities in the glue basin. If there is too much glue in the basin or after stopping the machine, send the discharged glue to the hot melt adhesive recycling center for reprocessing.

[0019] Preferably, the step of monitoring the adhesive volume using a thickness gauge in step S3 is as follows:

[0020] Turn on the thickness gauge and set the parameters according to the base paper to be coated. Set the glue volume alarm parameters based on the work order requirements. When the glue volume is not within the range required by the work order, the thickness gauge will display yellow data to remind that the glue volume is too high or too low. The operator should adjust the coating head screw in time according to the thickness measurement data to adjust the glue volume.

[0021] Preferably, the process of applying adhesive during startup in step S3 is as follows:

[0022] After starting the machine, assistant A is on duty at the coating head, checking the glue content, glue amount, abnormalities in the backing paper wrinkles, and the remaining glue in the glue box. Assistant B is on duty at the winding end. When the two leave their posts, assistant C takes over. After cutting the roll, check the core for wrinkles. When rewinding, observe the condition of the pressure roller. If any abnormalities such as high edge or glue overflow are found, slow down or stop the machine in time. When changing rolls, keep an eye on the machine. If any abnormalities are found, stop the machine in time. After cutting the roll, assistant C removes air bubbles and makes a mark and record.

[0023] Preferably, after the paper is cut and rolled, a rewinding and turning operation is performed. During the rewinding and turning process, the operation status of the pressure roller is closely observed to check whether there are any issues with the pressure roller causing paper wrinkling or jumping.

[0024] Preferably, in step S3, after the glue is applied upon startup, the product packaging is sealed with stretch film on the machine for protection. For products placed horizontally on the pallet, wooden plugs are used to secure the products on both sides to prevent them from rolling and falling. Appropriate labels and markings are affixed to the outer packaging of the products.

[0025] Preferably, in step S4, the amount of adhesive applied is based on the order information and remains within the required range; the width of the adhesive surface is greater than 2mm.

[0026] Preferably, in step S5, when replacing the filter screen of the plastic box, if there are special circumstances, the machine should be stopped and the power disconnected in time to replace the filter screen. Before replacing the filter screen, wrap the spare filter screen with the filter screen, pour car wash water into the filter cleaning bucket, unscrew the filter cover, use pliers to take out the filter, put it into the car wash water bucket, and replace it.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention employs a zoned precise temperature control strategy, setting dedicated temperature parameters for key components such as the glue tank, coating head, and glue delivery tube, and preheating them 3 hours in advance to avoid uneven heating of the hot melt adhesive and abnormal viscosity caused by local overheating. This ensures stable adhesive performance during the coating process, improving coating quality from the source. Combined with real-time monitoring by a thickness gauge and precise adjustment of the coating head screws and levers, dynamic adjustment of the glue quantity is achieved. The glue width control meets the work order requirements and is no less than the minimum required value of 2mm. This solves the problems of uneven glue quantity and insufficient glue width in traditional methods, significantly improving product dimensional accuracy and glue quantity consistency.

[0029] A three-tiered quality control system has been established, comprising first-piece inspection, real-time process monitoring, and full-item inspection of the unwound roll. Combined with periodic inspections such as half-hourly equipment self-inspections and hourly cooling system checks, defects such as uneven coating, missed coating, and wrinkled paper can be detected and addressed in real time, reducing the defect rate to below 1% and significantly improving product quality stability. Safety measures such as emergency stop switches, safety ropes, and glue outlet protection have been implemented, and operational prohibitions for equipment operation have been clearly defined. Furthermore, standardized records of production data, equipment inspections, and quality tests ensure traceability of the production process and significantly improve management standardization. Attached Figure Description

[0030] Figure 1 This is a flowchart of the steps of the present invention. Detailed Implementation

[0031] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] Reference Figure 1As shown, a hot melt adhesive coating and laminating machine has the following steps:

[0033] S1. Before the operation, review the production order information, collect and inspect the raw paper and hot melt adhesive, and record the material information;

[0034] The operator receives the signed "Production Work Order", verifies the core information such as production order code, product name, specifications, color, materials and production quantity, and proceeds with subsequent work after confirming that everything is correct.

[0035] According to the requirements of the "Production Work Order", the operator goes to the PMC material clerk to print the raw and auxiliary material requisition form containing the materials used in the night shift. With the form, the operator goes to the warehouse to collect materials such as raw paper and hot melt glue. After the materials arrive at the post, the quantity is counted and checked against the requisition form. The operator then completes the registration on the "Production Department Material Receipt and Issuance Record Form".

[0036] Conduct quality inspection on the received materials, check for rotten edges or holes in the raw paper, and confirm that the color, weight, and width of the raw paper are consistent with the work order requirements; check the quantity, type, color, and odor of the hot melt adhesive, and confirm that there are no problems such as deterioration or mismatch of type; if the materials are found to be non-compliant, immediately notify the quality department and warehouse staff for on-site confirmation and suspend the material requisition process.

[0037] S2. Before starting the machine, check the equipment air pressure and safety devices. Before starting the machine, start the heating system and set the glue tank temperature to 160℃, the coating head temperature to 180℃, the glue delivery tube temperature to 185℃, and the metering pump temperature to 175℃.

[0038] Check the machine's air pressure to ensure it remains above 7 kg; according to the "Equipment Inspection Checklist," check whether the fasteners are loose and whether the transmission parts are jammed; pull all safety ropes one by one and press the emergency stop switch to test whether they are working properly. After resetting, verify whether the machine can run normally. Record the results on the "Equipment Inspection Checklist" after the inspection is completed.

[0039] According to the product requirements in the "Production and Construction Order", confirm the amount of glue applied, the specifications of the raw material backing paper, and the hot melt adhesive type. Select the corresponding width of the stopper and glue roller, and complete the replacement and installation of the accessories.

[0040] Start the heating system three hours before powering on and set the temperature parameters for each part through the temperature control system: glue tank temperature 160℃, coating head temperature 180℃, glue delivery pipe temperature 185℃, metering pump temperature 175℃, left wall 1 and 2 and right wall 1 and 2 temperatures are all set at 160-180℃, and heat transfer oil temperature is set at 160-220℃; after the heating system is turned on, notify the hot melt adhesive group to put glue into the glue tank. The glue level in the glue tank must not exceed 15 cm below the glue tank opening.

[0041] Before loading the paper, double-check the product information against the work order, including the type, specifications, and color. Before loading the thermal paper, use your finger to draw two lines of appropriate length along the horizontal bar on the color-developing side of the thermal paper to confirm the paper orientation. Take a 50cm wide paper sample, poke two holes in it with a knife at the control panel, and mark the paper serial number. Send the sample to the quality inspection room for retention. After threading the paper, ensure that the adhesive side is on the back of the color-developing side of the thermal paper. Before loading the base paper, check the orientation of the silicone-coated side to ensure that the silicone-coated side passes the coating head and avoid coating the non-silicone side with the adhesive side.

[0042] According to the winding and printing direction of the incoming material, modify the parameters of the upper and lower paper cutting blades accordingly; manually modify the material roll diameter for the first roll of material after starting the machine, and only modify the mother roll diameter for subsequent rolls of the same length. The unwinding end is set to fully automatic by default, and switches to semi-automatic when manual paper cutting is required.

[0043] Check if the water levels of the thermostat and chiller are normal to avoid abnormal temperatures caused by low water levels after startup. After the water level is normal, turn on the thermostat, set the temperature to 50℃, and turn on the inlet and outlet circulating water switches to allow water to circulate through the coating rollers for heating.

[0044] S3. Glue application operation: After feeding the paper, feed the paper at a speed of 5m / min, manually remove the glue until there are no air bubbles, switch to automatic mode, monitor the glue amount through the thickness gauge, adjust the coating head screw to control the glue amount, and start the machine to apply glue.

[0045] Before starting the machine, check the status of the power switch, turn on the main power, and check whether each inverter and switch in the electrical box is working properly. After confirming that there are no faults, proceed to the next step.

[0046] Adjust the machine to normal operating condition. Use the paper guide rope to attach the ends of the bottom and top paper respectively, pass it through each paper feed roller and the bottom and top paper laminating roller, and pull the paper guide rope at the glue laminating roller to pull the bottom paper from the top paper end to the laminating roller position. After passing the bottom and top paper pressure rollers, press the communication bell on the control panel and turn on the single-action switch on the control page to make the paper move slowly until the bottom and top paper are laminated at the laminating roller. Remove the paper guide rope, laminate the bottom and top paper, and then use the paper guide rope to attach the laminated area. According to the paper feeding diagram of the coating machine, pass the paper guide rope through to the winding end, pull the paper guide rope and slowly feed the paper at a speed of 5m / min. During the paper feeding process, arrange safety personnel to watch the laminating and bottom paper feeding points. After the paper reaches the winding end, wrap the paper around the winding steel roller with tape attached.

[0047] Set the glue applicator operating parameters according to the requirements of the "Production and Construction Order". First, switch to manual mode and discharge glue from the coating head until the glue is free of air bubbles and flows out evenly. Then, switch to automatic mode. If glue blockage occurs during the glue discharge process, use a feeler gauge to clean the coating head and remove foreign objects. The glue discharge operation must be performed every time the backing paper is changed or the machine is stopped for an extended period of time. No foreign objects should be placed in the glue basin. Excess glue or glue discharged during machine stoppage should be collected and sent to the hot melt adhesive recycling center for reuse.

[0048] Turn on the thickness gauge switch, set the thickness gauge parameters according to the specifications of the base paper to be coated, and then set the glue volume alarm parameters according to the work order requirements; when the glue volume exceeds the range required by the work order, the thickness gauge will display a yellow data reminder, and the operator will wear gloves and use an Allen wrench to adjust the coating head screw to adjust the glue volume;

[0049] After glue discharge is completed, press the communication bell to notify all personnel at each machine station to prepare for startup. After all personnel are in position, start the machine and feed the paper. After the laminating personnel report that the bottom paper lamination is aligned, close the coating head and set the coating head and glue pump to automatic mode. Check if there is any glue residue on the glue surface and whether the glue width meets the requirements. The laminating personnel should adjust the correction device as needed according to the equipment running speed. Observe whether there is any glue sticking on the laminating roller. If so, stop the machine and wipe it off. After confirming that there are no abnormalities after startup, press the communication bell again. After the personnel at the take-up end find the marking, change the roll and take a sample. Self-check the glue surface condition, measure the glue surface width, and check the glue amount.

[0050] The amount of adhesive is adjusted by observing the real-time data from the thickness gauge. Turning the coating head screw clockwise reduces the amount of adhesive, while turning it counterclockwise increases the amount of adhesive. The advance and retreat distance of the coating head is adjusted by the rocker arms on both sides of the coating head and the cylinder advance and retreat switch, so as to achieve precise control of the coating thickness and width.

[0051] After the machine is running normally and the glue volume is normal, adjust the temperature of the thermostat to 23℃ and turn on the chiller to cool the chiller. Check the water level, temperature and operating status of the chiller and thermostat every two hours to ensure there are no abnormalities.

[0052] After adjusting the amount of adhesive and the width, start the equipment normally. At the coating head end, observe the adhesive surface for any abnormalities. At the winding end, check the product for any unevenness, wrinkles, high edges, winding misalignment, missed coating, or other issues. If any problems are found, immediately slow down and adjust the speed. Once the adjustment is satisfactory, accelerate the operation.

[0053] During startup, assistant A checks the coating head for issues such as glue residue, glue quantity deviation, paper wrinkling at the die head, and glue width abnormalities causing roller sticking, and observes the glue level in the glue tank; assistant B monitors the winding end, observing for paper wrinkles on the core and ensuring the winding is smooth; assistant C, as a mobile operator, takes over the work when assistants A and B leave their posts; any abnormalities are promptly reported to the operator, and the machine is slowed down or stopped if necessary.

[0054] When assistants C and B change the paper roll, they first place the paper on the lifting platform, confirm the printed side and winding direction, and ensure the paper is within the clamping range. After aligning the paper, they raise the lifting platform, clamp the paper roll, and briefly check if the outer packaging is intact. If the outer packaging is normal, they tear off the label and mark the paper's serial number. If the outer packaging is abnormal, they notify the operator to take photos as evidence and send them to the quality complaint group. The packaging can only be opened after the quality department and warehouse personnel confirm on-site. If the outer packaging is intact but the inside is damaged, they keep the outer packaging, take photos, and send them to the group. After the quality department confirms, they tear off the label. If damaged material is dropped, take a sample to confirm the printed surface, and after making the joint, flip the paper roll to the normal angle. Press the joint alignment key at the unwinding end of the face paper and hand it over to the operator for inspection and confirmation. When switching face paper, the staff should stay at the unwinding end of the face paper and be ready to press the emergency stop at any time. After the paper is spliced, follow the joint to the lamination area and observe whether there is any looseness on one side or excessive wrinkling of the lamination paper. If so, adjust the adjusting roller. If it cannot be adjusted, stop the machine and notify the quality department to confirm the raw material problem. Unload the problematic material, pack it properly, and mark it. After the quality department affixes the red label, return it to the warehouse, replace it with a new roll, and restart the equipment.

[0055] When assistants C and B change the bottom paper roll, they first confirm the silicone paper surface and winding direction, place the paper on the lifting platform, align it, raise the platform, and clamp the paper roll. If the silicone paper core is misaligned, place an iron ring on the side where the paper tube is misaligned to prevent the core paper from tearing after clamping. After loading the paper, jog to check whether there are any tears, frayed edges, or serious misalignment on both sides of the paper roll. If there are any abnormalities, take a photo and send it to the quality complaint group. After the quality department confirms and records it on-site, put away the label. After making the joint, flip the paper roll to the normal position, press the joint alignment button at the bottom paper unwinding end, and hand it over to the operator for inspection and confirmation. When changing the bottom paper roll, arrange for someone to watch at the unwinding end. If any abnormality is found in the core, press the emergency stop immediately. After the roll is cut, assistant C uses a knife to remove air bubbles at the small cooling cylinder and marks the cut with a marker. Place the mark at the winding end and record it on the secondary label. After the material is unwound, attach the secondary label to the material.

[0056] Assistant A records the roll number, length of paper produced, and width of each roll in the "Daily Production Report". Any abnormalities during the production process are also recorded simultaneously and marked on a secondary label. This label is then affixed to the material after it is unwound as a transfer document. The "Daily Production Report" must not be altered arbitrarily. If alterations are necessary, two horizontal lines are drawn, and the name and date are noted next to the line. Operators check the machine's operating status every half hour and record the results in the "Self-Inspection Report".

[0057] During production, assistant A monitors the glue level in the glue tank in real time. If it is cold glue being added, add glue as needed. If it is glue being dispensed through a pipe, check the glue supply every half hour and add glue as needed. When dispensing glue through a pipe, first open the glue outlet switch on top of the glue tank to notify the hot melt glue team to dispense glue. Use a cardboard box to block the glue outlet to prevent glue from spraying out and burning personnel. When the glue level reaches 15 cm below the glue tank opening, notify the hot melt glue team to turn off the glue pump. After no glue flows out of the glue pump, close the glue outlet switch.

[0058] When insufficient moisture is found in the silicone paper after the material is unwound, turn on the steam humidifier or three-roller humidifier to replenish the moisture of the silicone paper and avoid quality problems such as excessive warping or wrinkling of the product.

[0059] When glue residue frequently occurs during the production process, replace the filter screen in time; before replacement, stop the machine and turn off the power, and staff should wear gloves and other protective equipment; after replacement, make a record, and turn off all power and cooling equipment after each shutdown.

[0060] S4. Quality control: Production begins after the first piece passes inspection. The machine status is checked every half hour, and the width and amount of adhesive are checked after each roll is unwound.

[0061] After the material is unwound, immediately measure the width of the adhesive surface, check the amount of adhesive, and send a sample to the quality inspection laboratory for physical performance testing;

[0062] Before starting the machine each day and before each new work order, prepare a 2-meter first piece sample. Mark the sample with "First Piece Since Start-up" or "First Piece of Modified Order". Record the test data on the "First and Last Piece Self-Inspection Form". The sample must be labeled with the work order number, roll number, date, machine, specifications, product name, glue information, and off-machine time. Keep it safe for future tracking. Mass production can only begin after the first piece sample has been confirmed as qualified by the quality department.

[0063] After unwinding, seal the product packaging with stretch film on the machine; for products placed horizontally on the pallet, first check whether the sponge pad of the pallet is wet or contains foreign objects, whether there are nails or other protrusions on the pallet, and whether the pallet support feet are loose. After confirming that there are no problems, fix the product on both sides with wooden plugs to prevent it from rolling and falling; affix the corresponding labels and markings to the outer packaging of the product, and clearly describe the problem for abnormal products.

[0064] Every hour, check the constant temperature machine and chiller for leaks and ensure the water level is sufficient to ensure normal operation. Add water promptly if the water level is low, and immediately notify maintenance personnel if any equipment malfunctions. Observe the heat transfer oil level in the glue tank twice a day. If the level is lower than normal, stop the machine and add heat transfer oil to the safe level. Every 4 hours, check all transmission parts for abnormal noises and whether the motor is hot. Measure the motor temperature and confirm it is within the normal range. Each time the chuck pneumatic pump is used, observe for abnormal noises and check for water in the air pipe. If water is present, drain it promptly to prevent water from entering the pneumatic pump and causing rust.

[0065] All other product quality requirements shall be implemented in accordance with the standards of the "Product Operation Instruction".

[0066] S5. Equipment maintenance: Replace the filter screen of the plastic box every 3 days, and calibrate the machine level and clean the cooling system monthly.

[0067] Replace the filter screen in the glue box every three days. If any special circumstances occur, such as a broken filter screen, excessive glue residue causing blockage, or a filter screen being washed away due to loose binding, immediately stop the machine and disconnect the power to replace it. Before replacement, wrap the spare filter screen with the spare filter screen, pour car wash water into the filter cleaning bucket, and prepare tools and rags. When replacing, the worker should wear gloves and wrist guards, unscrew the filter cover, use pliers or bolt cutters to remove the filter, and gently place it into the car wash water bucket to avoid glue splashing onto their body. Insert the wrapped new filter, align it, and tighten the outer cover. After the replaced filter has cooled, clean it promptly and store it properly.

[0068] When replacing coating rollers of different specifications, first wrap the roller to be replaced with pearl cotton; turn off the cooling water switch, disconnect the water pipes at both ends of the roller, collect the water flowing out of the roller with a bucket, and after the water has drained, plug the two ends of the interface with rags; remove the drive belt and fixing screws, tie the two ends of the roller with straps, and lift the roller out with an electric hoist; lower one end of the roller, place an empty bucket underneath to collect the residual water in the roller, and after the water has drained, place a clean sponge pad underneath, slowly place the roller on the sponge pad, and pull it out with a forklift; remove the drive gear and bearing of the roller, put the removed roller into a box and label it for storage; install the drive gear and bearing on the new coating roller, lift the new roller into the equipment with an electric hoist, install the fixing screws and water pipes, and connect the drive belt; unpack the new roller, check if it is intact, and if there are no abnormalities, proceed with the pre-start preparations;

[0069] Before starting the machine each day, conduct a comprehensive inspection of the equipment according to the "Equipment Inspection Checklist" to check whether any machine parts are loose or detached, and whether there is lubricating oil in rotating parts such as bearings; before leaving get off work each day, perform 7S cleaning on the equipment to keep the equipment and surrounding area free of oil, dust, and debris.

[0070] The equipment in the new factory is leveled monthly to check for any settling and to adjust any tilting promptly. The equipment is maintained and repaired monthly, quarterly, and annually according to the requirements of the "Equipment Maintenance Record Form". The water in the chiller and thermostat is drained monthly, the inside is rinsed with clean water, and then refilled. When the machine is turned on again, the water level is observed during operation and water is added promptly if necessary.

[0071] Tools such as Allen wrenches, screwdrivers, and adjustable wrenches used for equipment maintenance should be regularly checked for good condition, stored separately, and properly labeled.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A method for applying adhesive using a hot melt adhesive coating and laminating machine, characterized in that, The steps are as follows: S1. Before the operation, review the production order information, collect and inspect the raw paper and hot melt adhesive, and record the material information; S2. Before starting the machine, check the equipment air pressure and safety devices. Before starting the machine, start the heating system and set the glue tank temperature to 160℃, the coating head temperature to 180℃, the glue delivery tube temperature to 185℃, and the metering pump temperature to 175℃. S3. Glue application operation: After feeding the paper, feed the paper at a speed of 5m / min, manually remove the glue until there are no air bubbles, switch to automatic mode, monitor the glue amount through the thickness gauge, adjust the coating head screw to control the glue amount, and start the machine to apply glue. S4. Quality control: Production begins after the first piece passes inspection. The machine status is checked every half hour, and the width and amount of adhesive are checked after each roll is unwound. S5. Equipment maintenance: Replace the filter screen of the plastic box every 3 days, and calibrate the machine level and clean the cooling system monthly.

2. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that: In step S1, the operator prints the raw and auxiliary material requisition form from the PMC material handler based on the order information and submits it to the warehouse for raw and auxiliary material requisition. After receiving the materials, the operator counts the materials and checks whether the raw paper has rotten edges, holes, and whether the color, weight, width, and quantity are consistent. The operator also checks the quantity, type, color, and odor of the glue.

3. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that, In step S3, the paper feed at a speed of 5m / min after paper insertion is as follows: After adjusting the machine to normal working condition, use paper guide ropes to stick the ends of the bottom paper and pass them through each paper feed roller and the bottom paper composite roller. Pull the paper guide rope at the glue coating and laminating roller and pull the bottom paper from the top paper end to the laminating roller position; Press the communication bell on the control panel to prepare the machine for normal start-up. Turn on the single-action switch to let the paper move until the bottom paper is pulled to the laminating roller for lamination. After removing the paper guide rope and bonding the bottom paper together, use the paper guide rope to stick the bonding area of ​​the bottom paper. After passing through the composite, follow the paper guide rope to the winding end according to the paper diagram of the coating machine. Pull the paper guide rope and feed the paper at a speed of 5m / min. Once the paper is in the correct position and reaches the winding point, wrap the paper around the winding steel roller with tape attached.

4. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that, The manual de-adhesive removal step in step S3 until no air bubbles are present is as follows: Set the operating parameters of the glue applicator, and discharge the glue from the coating head in manual mode. Stop discharging the glue when it flows out evenly without any air bubbles. After discharging the glue, set the glue applicator to automatic mode. Ensure there are no impurities in the glue basin. If there is too much glue in the basin or after stopping the machine, send the discharged glue to the hot melt adhesive recycling center for reprocessing.

5. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that: The step in step S3, which involves monitoring the adhesive volume using a thickness gauge, is as follows: Turn on the thickness gauge and set the parameters according to the base paper to be coated. Set the glue volume alarm parameters based on the work order requirements. When the glue volume is not within the range required by the work order, the thickness gauge will display yellow data to remind that the glue volume is too high or too low. The operator should adjust the coating head screw in time according to the thickness measurement data to adjust the glue volume.

6. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that, The specific steps for applying adhesive during the S3 process are as follows: After starting the machine, assistant A is on duty at the coating head, checking the glue content, glue amount, abnormalities in the backing paper wrinkles, and the remaining glue in the glue box. Assistant B is on duty at the winding end. When the two leave their posts, assistant C takes over. After cutting the roll, check the core for wrinkles. When rewinding, observe the condition of the pressure roller. If any abnormalities such as high edge or glue overflow are found, slow down or stop the machine in time. When changing rolls, keep an eye on the machine. If any abnormalities are found, stop the machine in time. After cutting the roll, assistant C removes air bubbles and makes a mark and record.

7. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 6, characterized in that: After the paper is cut, the paper is rewound and flipped. During the rewound and flipping process, the operation status of the pressure roller is closely observed to check whether there are any issues with the pressure roller causing paper wrinkling or jumping.

8. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that: In step S3, after the glue is applied upon startup, the product packaging is sealed with stretch film on the machine for protection. For products placed horizontally on the pallet, wooden plugs are used to secure the products on both sides to prevent them from rolling and falling. Appropriate labels and markings are then affixed to the outer packaging of the products.

9. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that: In step S4, the amount of adhesive applied should be based on the order information and kept within the required range; the width of the adhesive surface should be greater than 2mm.

10. The adhesive coating method of a hot melt adhesive coating and laminating machine according to claim 1, characterized in that: In step S5, when replacing the filter screen in the plastic box, if there are any special circumstances, the machine must be stopped and the power disconnected in time to replace the filter screen. Before replacing the filter screen, wrap the spare filter screen with the filter screen, pour car wash water into the filter cleaning bucket, unscrew the filter cover, use pliers to remove the filter, put it into the car wash water bucket, and replace it.

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