An easy-tear self-adhesive label and its processing method

Abstract

This invention relates to the field of label processing technology and discloses an easy-tear self-adhesive label and its processing method. The label includes a label layer, an adhesive layer fixedly connected to the lower surface of the label layer, and a pressing device on the lower surface of the label layer. The pressing device includes a squeezing chamber, a one-way valve fixedly connected to the upper end of the squeezing chamber, and a flexible tube fixedly connected to the end of the squeezing chamber near the adhesive layer. Multiple airbags are connected to the middle of the flexible tube. This invention, through the one-way valve, squeezing chamber, flexible tube, and airbags, allows the label layer to be quickly removed by the collision of the airbags when the label needs to be removed. Simultaneously, the remaining adhesive layer can be heated with a hot air gun. Since the EVA low-temperature hot melt adhesive used has a melting point of around 75°C, it can be easily removed after a certain degree of melting, and the removal process is less likely to damage the surface of the adhered object.

Description

Technical Field

[0001] This invention relates to the field of label processing technology, specifically to an easy-tear self-adhesive label and its processing method. Background Technology

[0002] Self-adhesive labels, also known as adhesive labels or self-adhesive labels, are a common type of product label or packaging label. They are labels that are applied directly to the surface of an object by coating a layer of adhesive on the back and then affixing them when needed.

[0003] In the existing technology, three-dimensional self-adhesive labels, as a type of self-adhesive label, achieve an aesthetic effect due to the specially designed textures or embossing on their surface, while also giving them a certain thickness to reduce the chance of damage when subjected to external pressure.

[0004] However, in actual use, because the adhesive used on the back of traditional three-dimensional self-adhesive labels has strong adhesion, when people need to peel off the label in this area later, the label often breaks and some parts remain stuck. At this time, it is necessary to use a scraper to continuously scrape the label to remove it completely. In view of this, we propose an easy-tear self-adhesive label and its processing method. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an easy-tear self-adhesive label and its processing method, solving the problem that the removal of three-dimensional self-adhesive labels in the prior art is time-consuming and laborious.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an easy-tear self-adhesive label and its processing method, comprising a labeling layer, an adhesive layer fixedly connected to the lower surface of the labeling layer, and a pressing device provided on the lower surface of the labeling layer;

[0007] The pressing device includes a squeezing chamber, the upper end of which is fixedly connected to a one-way valve, and the end of the squeezing chamber near the colloid layer is fixedly connected to a hose, the middle of which is connected to multiple airbags.

[0008] Preferably, the lower surface of the marking layer is fixedly connected to the airbag, the upper surface of the squeezing chamber is fixedly connected to the marking layer, a through hole is provided on the upper surface of the squeezing chamber, through holes are provided on both the left and right sides of the upper surface of the marking layer, the air intake direction of the one-way valve is unidirectional downward, and the outer surface of the hose is bonded to the colloid layer.

[0009] A method for processing easy-tear self-adhesive labels includes the following steps:

[0010] S1: Raw Material Selection

[0011] Choose suitable label materials, including PET film, airbags, and EVA low-temperature hot melt adhesive used in the manufacturing process, to ensure that the materials have sufficient strength and flexibility;

[0012] S2: Colloidal heating

[0013] The colloid is extruded using a twin-screw extruder, and the colloid inside the twin-screw extruder is heated during the extrusion process by a heating device inside the extruder.

[0014] S3: Graphic Design & Printing

[0015] Design the text, patterns, or images on the outside of the labeling layer according to actual needs, and cover them onto the outer surface of the prepared PET film to form the labeling layer;

[0016] S4: Airbag Adhesion

[0017] The airbag is evacuated and connected to the hose and compression chamber. The connection is sealed to form a pressing device. The pressed device is then installed on the back of the label layer.

[0018] S5: Colloidal coating

[0019] The labeling layer awaiting coating is transported to the bottom of the glue dispensing machine via a conveying device, and EVA low-temperature hot melt adhesive in a hot melt state is applied to the back of multiple labeling layers sequentially via the glue dispensing head.

[0020] S6: Cutting and trimming

[0021] Use a cutting machine or shearing machine to cut the printed label material into the required shape and size, and add tear lines at the joints between the labels as needed;

[0022] S7: Quality Verification

[0023] Quality inspections are conducted on both finished and in-process labels to ensure that each label meets specifications and is free from printing errors or material defects.

[0024] Preferably, the raw material preparation in step S1 requires preliminary inspection and preparation of various raw materials for use during the processing, including the following steps:

[0025] S101: Initial Inspection of Raw Materials

[0026] Quality inspections were conducted on the PET film, airbags, and EVA low-temperature hot melt adhesive to be used to ensure that the materials were undamaged, uncontaminated, and met the processing requirements.

[0027] S102: Raw material preparation

[0028] According to processing requirements, the qualified raw materials are classified and stored, and other auxiliary materials required for the processing are prepared, including cleaning agents and adhesives.

[0029] S103: Raw material pretreatment

[0030] Pre-treatment of some raw materials, including surface cleaning of PET film to remove surface oil and dust, is carried out to improve printing quality and adhesive adhesion.

[0031] Preferably, the colloid heating in S2 is mainly used to heat and extrude the pre-inspected EVA low-temperature hot melt adhesive into the dispensing machine, including the following steps:

[0032] S201: Colloidal preheating

[0033] The EVA low-temperature hot melt adhesive is fed into the feed port of the twin-screw extruder. The twin-screw extruder is then turned on, allowing the EVA low-temperature hot melt adhesive to be conveyed forward under the push of the twin screws. The EVA low-temperature hot melt adhesive is preheated by the heating device inside the twin-screw extruder. At the same time, the temperature status of each area inside the extruder is detected by an infrared temperature sensor, and corresponding temperature change curves are generated.

[0034] S202: Temperature Control

[0035] Establish a preset temperature change curve, which is the desired curve of the internal colloid temperature change state, and import it into the actual temperature change curve obtained in S201 for comparison. By comparing the curvature difference between the two, the temperature control signal is fed back to the heating device to adjust its power and operating status.

[0036] S203: Colloidal Extrusion

[0037] The preheated EVA low-temperature hot melt adhesive is extruded through the extrusion port of a twin-screw extruder to form a continuous colloid flow, ready to enter the next coating process.

[0038] S204: Colloid Detection

[0039] The extruded EVA low-temperature hot melt adhesive is subjected to quality inspection, including checking parameters such as color, uniformity, and temperature, to ensure that the quality of the adhesive meets the processing requirements.

[0040] Preferably, the image design printing in S3 is mainly used for printing text, patterns, or image information on the surface of the label layer, including the following steps:

[0041] S301: Pattern Design

[0042] Based on the usage environment and requirements of the label, use design software to draw or edit the text, patterns or images on the surface of the label layer, and ensure that they are consistent with the overall design style and design requirements of the label.

[0043] S302: Pattern Preprocessing

[0044] The designed pattern is pre-processed, including color calibration and resolution adjustment, to ensure that the pattern can be presented clearly and accurately during the printing process;

[0045] S303: Pattern Printing

[0046] Start the printing press and print the designed pattern onto the PET film surface through the print head, ensuring accurate printing position, rich colors, and clear lines;

[0047] S304: Surface treatment

[0048] Depending on actual usage requirements, a film or waterproof coating may be applied to the surface of the printed label layer to improve the durability and lifespan of the label body.

[0049] Preferably, the airbag adhesion in step S4 is mainly used to install the pressing device on the back of the label layer, including the following steps:

[0050] S401: Airbag Preparation

[0051] Inflate the airbag to ensure it is leak-free, undamaged, and meets processing requirements. At the same time, clean the hose and extrusion chamber to remove surface oil and dust to improve connection quality and sealing performance.

[0052] S402: Connection Assembly

[0053] Connect one end of the hose to the air inlet of the airbag and the other end to the air outlet of the squeezing chamber, ensuring that the connection is tight and leak-free. At the same time, fix the upper surface of the squeezing chamber to the lower surface of the marking layer, ensuring that the connection is firm and without misalignment.

[0054] S403: Sealing treatment

[0055] During the assembly process, the joints are sealed, including by using sealant or hot melt adhesive to seal the joints, to ensure that the joint between the airbag and the label layer does not leak or fall off.

[0056] Preferably, the colloidal coating in step S5 is mainly used to coat the back of the labeling layer with EVA low-temperature hot melt adhesive in a hot melt state, including the following steps:

[0057] S501: Vacuum generator on / off

[0058] The area to be injected with adhesive is sealed and covered by a vacuum hood, and the area is evacuated by a negative pressure generating device, ensuring that the negative pressure inside the area is between -5kPa and -8kPa.

[0059] S502: Colloidal Delivery

[0060] Start the dispensing machine and deliver the preheated EVA low-temperature hot melt adhesive to the back of the labeling layer through the dispensing head, ensuring that the adhesive is evenly and continuously coated on the surface of the labeling layer;

[0061] S503: Colloidal pressing

[0062] The coated marking layer is pressed using a pressing device to ensure that the EVA low-temperature hot melt adhesive is tightly bonded to the back of the marking layer, thereby improving the adhesion of the adhesive.

[0063] S504: Colloidal Curing

[0064] Turning off the negative pressure generator allows outside air to smoothly enter the area sealed by the sealing cover. At this time, the airflow will perform air-cooling curing of the EVA low-temperature hot melt adhesive, ensuring that the bond between the adhesive and the label layer is firm and not easy to fall off.

[0065] Preferably, the cutting and trimming in S6 is mainly used to cut large pieces of self-adhesive labels into whole pieces of a specified length and width, including the following steps:

[0066] S601: Cutting Preparation

[0067] Inspect and adjust the cutting blades to ensure they are sharp and free from wear, and set the cutting length and width according to the label size requirements to ensure cutting accuracy;

[0068] S602: Cutting operation

[0069] Start the cutting machine and continuously feed the processed labels into the cutting machine. The cutting blades cut the labels according to the set size, or form label products that meet the specifications.

[0070] S603: Cutting Inspection

[0071] The cut labels are inspected for quality to check whether the cutting size is accurate, whether the edges are flat and undamaged, and to ensure that each label meets the quality standards. At the same time, for labels with abnormal sizes, the adjustment signal is fed back to step S601 to perform preset cutting size self-adjustment.

[0072] Preferably, the quality verification in S7 is mainly used to conduct quality inspection on the final produced labels, including the following steps:

[0073] S701: Visual Inspection

[0074] Inspect the appearance of the label, including whether the color, font and pattern of the label are clear and accurate, without blurring, misalignment and omission. At the same time, check whether the surface of the label is flat, without bubbles, dust and impurities.

[0075] S702: Dimension Measurement

[0076] Use measuring tools to measure the dimensions of the labels, including parameters such as the length, width, and thickness, to ensure that the dimensions of the labels meet the design requirements and that the dimensional error of each label is within the allowable range;

[0077] S703: Viscosity Test

[0078] The adhesiveness of the labels is tested using professional adhesive testing instruments to ensure that the labels can adhere firmly to the target object during use and are not easy to fall off or leave adhesive residue.

[0079] Working principle: When it is necessary to remove this device, the labeling layers on both sides can be squeezed continuously and simultaneously. This causes the squeezing chamber on the back of the labeling layer to force the internal gas into the airbag due to the compression. At the same time, when the labeling layer is released, since the airbag has initially squeezed the colloid layer and expanded part of the space, the combined volume of the squeezing chamber and the airbag increases, thus reducing the air pressure inside the squeezing chamber. This allows outside air to enter the squeezing chamber through the one-way valve. Therefore, through repeated squeezing, the airbag can be fully expanded, gradually supporting the labeling layer that is fixed to it and reducing the contact area between the labeling layer and the colloid layer. At this point, the labeling layer can be easily removed. Meanwhile, the remaining colloid layer, since its main component is EVA low-temperature hot melt adhesive with a melting point of 75℃, can be heated to its melting point temperature by a hot air blower. After the colloid layer softens, it can be easily removed with a scraper.

[0080] This invention provides an easy-tear self-adhesive label and its processing method. It has the following beneficial effects:

[0081] 1. This invention, through the design of a one-way valve, a squeezing chamber, a hose, and an airbag, can separate the label layer from the adhesive layer by the impact of the airbag when the device needs to be removed, thus allowing the label layer to be quickly removed. At the same time, the remaining adhesive layer can be heated by a hot air gun. Since the EVA low-temperature hot melt adhesive used has a melting point of about 75°C, it can be easily removed after it has undergone a certain amount of melting, and the surface of the adhered object is not easily damaged during the removal process.

[0082] 2. This invention uses a twin-screw extruder to extrude colloidal materials. During the extrusion process, the materials are heated to ensure the overall fluidity of the colloid. Furthermore, during the heating process, an infrared temperature measuring device monitors the temperature change curves of various characteristic areas inside the twin-screw extruder. The heating device is then controlled by comparing the actual temperature change curve with the desired temperature change curve, thereby preventing the quality of the colloid from being affected by excessively high or low temperatures.

[0083] 3. By adding a sealing cover and a negative pressure generating device during the glue dispensing process, the glue dispensing area can always be in a certain degree of vacuum state during the glue dispensing process. This avoids the phenomenon that dust and impurities from the external environment are mixed inside the glue due to air flow, which would affect the adhesion performance of the final three-dimensional self-adhesive label. Attached Figure Description

[0084] Figure 1 This is a perspective view of the present invention;

[0085] Figure 2 This is a schematic diagram of a cross-section of the present invention;

[0086] Figure 3 A flowchart of a method for processing easy-tear self-adhesive labels;

[0087] Figure 4 This is a flowchart of S1 of the present invention;

[0088] Figure 5 This is a flowchart of S2 of the present invention;

[0089] Figure 6 This is a flowchart of S3 of the present invention;

[0090] Figure 7 This is a flowchart of S4 of the present invention;

[0091] Figure 8 This is a flowchart of S5 of the present invention;

[0092] Figure 9 This is a flowchart of S6 of the present invention;

[0093] Figure 10 This is a flowchart of S7 of the present invention.

[0094] The components include: 1. Labeling layer; 2. Pressing device; 3. Colloid layer; 201. One-way valve; 202. Squeezing chamber; 203. Hose; 204. Airbag. Detailed Implementation

[0095] The technical solutions in 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.

[0096] Please see the appendix Figure 1 - Appendix Figure 2 This invention provides an easy-tear self-adhesive label and its processing method, including a labeling layer 1, an adhesive layer 3 fixedly connected to the lower surface of the labeling layer 1, and a pressing device 2 provided on the lower surface of the labeling layer 1.

[0097] The pressing device 2 includes a squeezing chamber 202, which is made of thin rubber material, thus enabling it to maintain a certain deformation capacity to withstand the pressure from the marking layer 1. A one-way valve 201 is fixedly connected to the upper end of the squeezing chamber 202, and a hose 203 is fixedly connected to the end of the squeezing chamber 202 near the colloid layer 3. Multiple airbags 204 are connected to the middle of the hose 203.

[0098] The lower surface of the label layer 1 is fixedly connected to the airbag 204. Therefore, when the airbag 204 inflates, it will simultaneously lift the upper label layer 1, allowing it to separate from the lower gel layer 3. The upper surface of the compression chamber 202 is fixedly connected to the label layer 1. Therefore, the label layer 1 can be squeezed to the lower compression chamber 202. A through hole is provided on the upper surface of the compression chamber 202, allowing it to be connected to the upper one-way valve 201. Through holes are provided on both the left and right sides of the upper surface of the label layer 1, allowing it to be fixedly connected to the one-way valve 201. The air intake direction of the one-way valve 201 is unidirectional downward, thus preventing the air entering the compression chamber 202 from flowing out of the compression chamber 202 in the opposite direction. The outer surface of the hose 203 is bonded to the gel layer 3.

[0099] Please see the appendix Figure 3 - Appendix Figure 10 A method for processing easy-tear self-adhesive labels includes the following steps:

[0100] S1: Raw Material Selection

[0101] Choose suitable label materials, including PET film, airbags, and EVA low-temperature hot melt adhesive used in the manufacturing process, to ensure that the materials have sufficient strength and flexibility;

[0102] S2: Colloidal heating

[0103] The colloid is extruded using a twin-screw extruder, and the colloid inside the twin-screw extruder is heated during the extrusion process by a heating device inside the extruder.

[0104] S3: Graphic Design & Printing

[0105] Design the text, patterns, or images on the outside of the labeling layer according to actual needs, and cover them onto the outer surface of the prepared PET film to form the labeling layer;

[0106] S4: Airbag Adhesion

[0107] The airbag is evacuated and connected to the hose and compression chamber. The connection is sealed to form a pressing device. The pressed device is then installed on the back of the label layer.

[0108] S5: Colloidal coating

[0109] The labeling layer awaiting coating is transported to the bottom of the glue dispensing machine via a conveying device, and EVA low-temperature hot melt adhesive in a hot melt state is applied to the back of multiple labeling layers sequentially via the glue dispensing head.

[0110] S6: Cutting and trimming

[0111] Use a cutting machine or shearing machine to cut the printed label material into the required shape and size, and add tear lines at the joints between the labels as needed;

[0112] S7: Quality Verification

[0113] Quality inspections are conducted on both finished and in-process labels to ensure that each label meets specifications and is free from printing errors or material defects.

[0114] The raw material preparation in S1 requires preliminary inspection and preparation of various raw materials for use during the processing, including the following steps:

[0115] S101: Initial Inspection of Raw Materials

[0116] Quality inspections were conducted on the PET film, airbags, and EVA low-temperature hot melt adhesive to be used to ensure that the materials were undamaged, uncontaminated, and met the processing requirements.

[0117] S102: Raw material preparation

[0118] According to processing requirements, the qualified raw materials are classified and stored, and other auxiliary materials required for the processing are prepared, including cleaning agents and adhesives.

[0119] S103: Raw material pretreatment

[0120] Pre-treatment of some raw materials, including surface cleaning of PET film to remove oil and dust, is performed to improve printing quality and adhesive adhesion.

[0121] During the production process, the surface of PET film is often contaminated with impurities such as oil and dust. These impurities not only affect the printing quality but may also reduce the adhesion of the adhesive, thereby affecting the overall performance of the product.

[0122] Therefore, surface cleaning of PET film before printing is particularly important. This step mainly involves removing impurities such as oil and dust from the surface to provide a clean and smooth surface for subsequent printing and adhesive adhesion. Through surface cleaning, we can significantly improve printing quality and adhesive adhesion, thereby ensuring the stability and durability of the product.

[0123] In actual production, there are various methods for surface cleaning of PET film. Among them, chemical cleaning is a commonly used method. By using specific chemical cleaning agents, oil and dust impurities on the surface can be effectively removed. However, it should be noted that although surface cleaning can improve printing quality and adhesive adhesion, it may also have a certain impact on other properties of PET film. Therefore, when selecting a surface cleaning method, it is necessary to comprehensively consider its impact on product quality and production costs.

[0124] In conclusion, surface cleaning of PET film is an important step in ensuring printing quality and adhesive adhesion. By selecting appropriate surface cleaning methods, we can effectively remove impurities such as oil and dust from the surface, providing a clean and smooth surface for subsequent printing and adhesive adhesion.

[0125] The colloid heating in S2 is mainly used to heat and extrude the pre-inspected EVA low-temperature hot melt adhesive into the dispensing machine, including the following steps:

[0126] S201: Colloidal preheating

[0127] The EVA low-temperature hot melt adhesive is fed into the feed port of the twin-screw extruder. The twin-screw extruder is then turned on, allowing the EVA low-temperature hot melt adhesive to be conveyed forward under the push of the twin screws. The EVA low-temperature hot melt adhesive is preheated by the heating device inside the twin-screw extruder. At the same time, the temperature status of each area inside the extruder is detected by an infrared temperature sensor, and corresponding temperature change curves are generated.

[0128] First, EVA low-temperature hot melt adhesive is fed into the feed port of a twin-screw extruder. As a highly efficient material conveying and mixing device, the twin-screw extruder consists of two interlocking screws, which can achieve efficient mixing and shearing while conveying materials. When the EVA low-temperature hot melt adhesive enters the feed port of the extruder, it begins to be conveyed forward under the push of the twin screws.

[0129] During the conveying process, the EVA low-temperature hot melt adhesive is preheated by the heating device inside the twin-screw extruder. This step is crucial because proper preheating allows the EVA low-temperature hot melt adhesive to flow and form better in subsequent production processes. The heating device uses an intelligent control system to precisely control the heating temperature and heating time, ensuring that the EVA low-temperature hot melt adhesive does not undergo thermal degradation or overheating during the preheating process.

[0130] Meanwhile, to ensure the accuracy and safety of the preheating process, we use infrared temperature sensors to detect the temperature status of various areas inside the extruder. The infrared temperature sensors can monitor the temperature of various points inside the extruder in real time and transmit the data to the control system in real time. The control system dynamically adjusts the heating power of the heating device based on the received temperature data to ensure the stability and uniformity of the temperature inside the extruder. Through real-time monitoring of the temperature inside the extruder by infrared temperature sensors, we can not only detect and deal with temperature anomalies in a timely manner, but also generate corresponding temperature change curves. These curves intuitively show how the temperature inside the extruder changes over time.

[0131] S202: Temperature Control

[0132] Establish a preset temperature change curve, which is the desired curve of the internal colloid temperature change state, and import it into the actual temperature change curve obtained in S201 for comparison. By comparing the curvature difference between the two, the temperature control signal is fed back to the heating device to adjust its power and operating status.

[0133] S203: Colloidal Extrusion

[0134] The preheated EVA low-temperature hot melt adhesive is extruded through the extrusion port of a twin-screw extruder to form a continuous colloid flow, ready to enter the next coating process.

[0135] S204: Colloid Detection

[0136] The extruded EVA low-temperature hot melt adhesive is subjected to quality inspection, including checking parameters such as color, uniformity, and temperature, to ensure that the quality of the adhesive meets the processing requirements.

[0137] The image design printing in S3 is mainly used for printing text, patterns, or image information on the surface of the label layer, and includes the following steps:

[0138] S301: Pattern Design

[0139] Based on the usage environment and requirements of the label, use design software to draw or edit the text, patterns or images on the surface of the label layer, and ensure that they are consistent with the overall design style and design requirements of the label.

[0140] S302: Pattern Preprocessing

[0141] The designed pattern is pre-processed, including color calibration and resolution adjustment, to ensure that the pattern can be presented clearly and accurately during the printing process;

[0142] S303: Pattern Printing

[0143] Start the printing press and print the designed pattern onto the PET film surface through the print head, ensuring accurate printing position, rich colors, and clear lines;

[0144] S304: Surface treatment

[0145] Depending on actual usage requirements, a film or waterproof coating may be applied to the surface of the printed label layer to improve the durability and lifespan of the label body.

[0146] The airbag adhesion in S4 is mainly used to install the compression device on the back of the label layer, including the following steps:

[0147] S401: Airbag Preparation

[0148] Inflate the airbag to ensure it is leak-free, undamaged, and meets processing requirements. At the same time, clean the hose and extrusion chamber to remove surface oil and dust to improve connection quality and sealing performance.

[0149] S402: Connection Assembly

[0150] Connect one end of the hose to the air inlet of the airbag and the other end to the air outlet of the squeezing chamber, ensuring that the connection is tight and leak-free. At the same time, fix the upper surface of the squeezing chamber to the lower surface of the marking layer, ensuring that the connection is firm and without misalignment.

[0151] S403: Sealing treatment

[0152] During the assembly process, the joints are sealed, including by using sealant or hot melt adhesive to seal the joints, to ensure that the joint between the airbag and the label layer does not leak or fall off.

[0153] The colloidal coating in step S5 is mainly used to coat the back of the labeling layer with EVA low-temperature hot melt adhesive in a hot melt state, including the following steps:

[0154] S501: Vacuum generator on / off

[0155] The area to be injected with adhesive is sealed and covered by a vacuum hood, and the area is evacuated by a negative pressure generating device, ensuring that the negative pressure inside the area is between -5kPa and -8kPa.

[0156] First, during the adhesive injection process, a vacuum chamber is used to cover the area to be injected, forming a sealed space to prevent external air or impurities from entering. Next, we need to use a negative pressure generating device to evacuate the area inside the vacuum chamber. The negative pressure generating device is one of the core components of vacuum technology. It can extract air molecules from the vacuum chamber through a series of mechanical or physical means, thereby reducing its internal air pressure. During this process, we need to closely monitor the negative pressure inside the area to ensure that it is maintained between -5 kPa and -8 kPa. This ensures the smooth progress of the adhesive injection process and avoids a series of problems caused by excessively low pressure, such as material deformation or equipment damage.

[0157] Because a vacuum environment can effectively remove oxygen and moisture from the air, it can prevent chemical reactions such as oxidation or hydrolysis that may occur during the dispensing process. In addition, a vacuum environment can reduce the formation and escape of bubbles, making the dispensing more uniform and dense. These advantages can not only improve the quality and performance of dispensing products, but also extend their service life to a certain extent.

[0158] S502: Colloidal Delivery

[0159] Start the dispensing machine and deliver the preheated EVA low-temperature hot melt adhesive to the back of the labeling layer through the dispensing head, ensuring that the adhesive is evenly and continuously coated on the surface of the labeling layer;

[0160] S503: Colloidal pressing

[0161] The coated marking layer is pressed using a pressing device to ensure that the EVA low-temperature hot melt adhesive is tightly bonded to the back of the marking layer, thereby improving the adhesion of the adhesive.

[0162] S504: Colloidal Curing

[0163] Turning off the negative pressure generator allows outside air to smoothly enter the area sealed by the sealing cover. At this time, the airflow will perform air-cooling curing of the EVA low-temperature hot melt adhesive, ensuring that the bond between the adhesive and the label layer is firm and not easy to fall off.

[0164] The cutting and trimming step S6 is mainly used to cut large pieces of self-adhesive labels into whole pieces of a specified length and width, including the following steps:

[0165] S601: Cutting Preparation

[0166] Inspect and adjust the cutting blades to ensure they are sharp and free from wear, and set the cutting length and width according to the label size requirements to ensure cutting accuracy;

[0167] S602: Cutting operation

[0168] Start the cutting machine and continuously feed the processed labels into the cutting machine. The cutting blades cut the labels according to the set size, or form label products that meet the specifications.

[0169] S603: Cutting Inspection

[0170] The cut labels are inspected for quality to check whether the cutting size is accurate, whether the edges are flat and undamaged, and to ensure that each label meets the quality standards. At the same time, for labels with abnormal sizes, the adjustment signal is fed back to step S601 to perform preset cutting size self-adjustment.

[0171] The quality verification in S7 is mainly used to inspect the quality of the final produced labels, and includes the following steps:

[0172] S701: Visual Inspection

[0173] Inspect the appearance of the label, including whether the color, font and pattern of the label are clear and accurate, without blurring, misalignment and omission. At the same time, check whether the surface of the label is flat, without bubbles, dust and impurities.

[0174] S702: Dimension Measurement

[0175] Use measuring tools to measure the dimensions of the labels, including parameters such as the length, width, and thickness, to ensure that the dimensions of the labels meet the design requirements and that the dimensional error of each label is within the allowable range;

[0176] S703: Viscosity Test

[0177] The adhesiveness of the labels is tested using professional adhesive testing instruments to ensure that the labels can adhere firmly to the target object during use and are not easy to fall off or leave adhesive residue.

[0178] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An easy-tear self-adhesive label, comprising an identification layer (1), characterized in that, A colloid layer (3) is fixedly connected to the lower surface of the labeling layer (1), and a pressing device (2) is provided on the lower surface of the labeling layer (1). The pressing device (2) includes a squeezing chamber (202), a one-way valve (201) is fixedly connected to the upper end of the squeezing chamber (202), and a hose (203) is fixedly connected to one end of the squeezing chamber (202) near the colloid layer (3). The middle part of the hose (203) is connected to multiple airbags (204). The lower surface of the labeling layer (1) is fixedly connected to the airbag (204), the upper surface of the squeezing chamber (202) is fixedly connected to the labeling layer (1), a through hole is provided on the upper surface of the squeezing chamber (202), through holes are provided on both the left and right sides of the upper surface of the labeling layer (1), the air intake direction of the one-way valve (201) is one-way downward, and the outer surface of the hose (203) is bonded to the colloid layer (3).

2. The method for processing easy-tear self-adhesive labels according to claim 1, characterized in that, Includes the following steps: S1: Raw Material Selection Choose suitable label materials, including PET film, airbags, and EVA low-temperature hot melt adhesive used in the manufacturing process, to ensure that the materials have sufficient strength and flexibility; S2: Colloidal heating The colloid is extruded using a twin-screw extruder, and the colloid inside the twin-screw extruder is heated during the extrusion process using an internal heating device. S3: Graphic Design & Printing Design the text, patterns, or images on the outside of the labeling layer according to actual needs, and cover them onto the outer surface of the prepared PET film to form the labeling layer; S4: Airbag Adhesion The airbag is evacuated and connected to the hose and compression chamber. The connection is sealed to form a pressing device. The pressed device is then installed on the back of the label layer. S5: Colloidal coating The labeling layer awaiting coating is transported to the bottom of the glue dispensing machine via a conveying device, and EVA low-temperature hot melt adhesive in a hot melt state is applied to the back of multiple labeling layers sequentially via the glue dispensing head. S6: Cutting and trimming Use a cutting machine or shearing machine to cut the printed label material into the required shape and size, and add tear lines at the joints between the labels as needed; S7: Quality Verification Quality inspections are conducted on both finished and in-process labels to ensure that each label meets specifications and is free from printing errors or material defects.

3. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The raw material preparation in S1 requires preliminary inspection and preparation of various raw materials for use during the processing, including the following steps: S101: Initial Inspection of Raw Materials Quality inspections were conducted on the PET film, airbags, and EVA low-temperature hot melt adhesive to be used to ensure that the materials were undamaged, uncontaminated, and met the processing requirements. S102: Raw material preparation According to processing requirements, the qualified raw materials are classified and stored, and other auxiliary materials required for the processing are prepared, including cleaning agents and adhesives. S103: Raw material pretreatment Pre-treatment of some raw materials, including surface cleaning of PET film to remove surface oil and dust, is carried out to improve printing quality and adhesive adhesion.

4. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The colloid heating in S2 is mainly used to heat and extrude the pre-inspected EVA low-temperature hot melt adhesive into the dispensing machine, including the following steps: S201: Colloidal preheating The EVA low-temperature hot melt adhesive is fed into the feed port of the twin-screw extruder. The twin-screw extruder is then turned on, allowing the EVA low-temperature hot melt adhesive to be conveyed forward under the push of the twin screws. The EVA low-temperature hot melt adhesive is preheated by the heating device inside the twin-screw extruder. At the same time, the temperature status of each area inside the extruder is detected by an infrared temperature sensor, and corresponding temperature change curves are generated. S202: Temperature Control Establish a preset temperature change curve, which is the desired curve of the internal colloid temperature change state, and import it into the actual temperature change curve obtained in S201 for comparison. By comparing the curvature difference between the two, the temperature control signal is fed back to the heating device to adjust its power and operating status. S203: Colloidal Extrusion The preheated EVA low-temperature hot melt adhesive is extruded through the extrusion port of a twin-screw extruder to form a continuous colloid flow, ready to enter the next coating process. S204: Colloid Detection The extruded EVA low-temperature hot melt adhesive is subjected to quality inspection, including checking parameters such as color, uniformity, and temperature, to ensure that the quality of the adhesive meets the processing requirements.

5. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The image design printing in S3 is mainly used for printing text, patterns, or image information on the surface of the label layer, and includes the following steps: S301: Pattern Design Based on the usage environment and requirements of the label, use design software to draw or edit the text, patterns or images on the surface of the label layer, and ensure that they are consistent with the overall design style and design requirements of the label. S302: Pattern Preprocessing The designed pattern is pre-processed, including color calibration and resolution adjustment, to ensure that the pattern can be presented clearly and accurately during the printing process; S303: Pattern Printing Start the printing press and print the designed pattern onto the PET film surface through the print head, ensuring accurate printing position, rich colors, and clear lines; S304: Surface treatment Depending on actual usage requirements, a film or waterproof coating may be applied to the surface of the printed label layer to improve the durability and lifespan of the label body.

6. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The airbag adhesion in S4 is mainly used to install the compression device on the back of the label layer, including the following steps: S401: Airbag Preparation Inflate the airbag to ensure it is leak-free, undamaged, and meets processing requirements. At the same time, clean the hose and extrusion chamber to remove surface oil and dust to improve connection quality and sealing performance. S402: Connection Assembly Connect one end of the hose to the air inlet of the airbag and the other end to the air outlet of the squeezing chamber, ensuring that the connection is tight and leak-free. At the same time, fix the upper surface of the squeezing chamber to the lower surface of the marking layer, ensuring that the connection is firm and without misalignment. S403: Sealing treatment During the assembly process, the joints are sealed, including by using sealant or hot melt adhesive to seal the joints, to ensure that the joint between the airbag and the label layer does not leak or fall off.

7. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The colloidal coating in step S5 is mainly used to coat the back of the labeling layer with EVA low-temperature hot melt adhesive in a hot melt state, including the following steps: S501: Vacuum generator on / off The area to be injected with adhesive is sealed and covered by a vacuum hood, and the area is evacuated by a negative pressure generating device, ensuring that the negative pressure inside the area is between -5kPa and -8kPa. S502: Colloidal Delivery Start the dispensing machine and deliver the preheated EVA low-temperature hot melt adhesive to the back of the labeling layer through the dispensing head, ensuring that the adhesive is evenly and continuously coated on the surface of the labeling layer; S503: Colloidal pressing The coated marking layer is pressed using a pressing device to ensure that the EVA low-temperature hot melt adhesive is tightly bonded to the back of the marking layer, thereby improving the adhesion of the adhesive. S504: Colloidal Curing Turning off the negative pressure generator allows outside air to smoothly enter the area sealed by the sealing cover. At this time, the airflow will perform air-cooling curing of the EVA low-temperature hot melt adhesive, ensuring that the bond between the adhesive and the label layer is firm and not easy to fall off.

8. The method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The cutting and trimming step S6 is mainly used to cut large pieces of self-adhesive labels into whole pieces of a specified length and width, including the following steps: S601: Cutting Preparation Inspect and adjust the cutting blades to ensure they are sharp and free from wear, and set the cutting length and width according to the label size requirements to ensure cutting accuracy; S602: Cutting operation Start the cutting machine and continuously feed the processed labels into the cutting machine. The cutting blades cut the labels according to the set size, or form label products that meet the specifications. S603: Cutting Inspection The cut labels are inspected for quality to check whether the cutting size is accurate, whether the edges are flat and undamaged, and to ensure that each label meets the quality standards. At the same time, for labels with abnormal sizes, the adjustment signal is fed back to step S601 to perform preset cutting size self-adjustment.

9. A method for processing easy-tear self-adhesive labels according to claim 2, characterized in that, The quality verification in S7 is mainly used to inspect the quality of the final produced labels, and includes the following steps: S701: Visual Inspection Inspect the appearance of the label, including whether the color, font and pattern of the label are clear and accurate, without blurring, misalignment and omission. At the same time, check whether the surface of the label is flat, without bubbles, dust and impurities. S702: Dimension Measurement Use measuring tools to measure the dimensions of the labels, including parameters such as the length, width, and thickness, to ensure that the dimensions of the labels meet the design requirements and that the dimensional error of each label is within the allowable range; S703: Viscosity Test The adhesiveness of the labels is tested using professional adhesive testing instruments to ensure that the labels can adhere firmly to the target object during use and are not easy to fall off or leave adhesive residue.

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