Adhesive gel seal and method for manufacturing the same

Abstract

This invention relates to a seal using an adhesive gel and a method for manufacturing the same. Conventionally, with thick gel sheets, high-resolution printing is difficult due to the adhesiveness of the surface, and it is also difficult to maintain the function of preventing accidental ingestion with a bittering agent and the design after washing. This invention employs a configuration in which an adhesive gel sheet is cut into a desired shape, an image is formed on the surface with reduced adhesiveness, a bittering agent is applied, and a transparent protective layer is formed to continuously cover the surface and the sides of the gel sheet. This provides an adhesive gel seal that enables the formation of a high-resolution design and can maintain the image and bittering function while recovering its adhesive strength after washing.

Description

Technical Field

[0001] The present invention relates to a seal using an adhesive gel and a method for manufacturing the same.

Background Art

[0002] Seals using an adhesive gel material are used for applications such as decoration due to their flexibility and reattachable characteristics. However, as described in Patent Document 2, there is a problem that the adhesion of printing is low due to the surface structure of the gel or the like. In addition, in order to prevent accidental ingestion by infants, a technique of imparting a bitter component is known as shown in Patent Document 1 and Patent Document 3. According to Patent Document 1, in order to prevent the disappearance of the bitter component by washing with water or wiping with water, coating with a solvent-based paint has been proposed, but protection including the side surface in a thick gel product and the compatibility between the restoration of the adhesive force by washing and the maintenance of bitterness have not been sufficiently considered. Particularly in a thick gel sheet, the adhesion of dirt due to the adhesiveness on the side surface is remarkable, and a technique for continuously forming a protective layer from the surface to the side surface and highly maintaining the safety function and durability is required.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional technologies have presented technical barriers to transforming hand-drawn illustrations and other creative works into high-quality products due to manufacturing know-how and cost. In particular, when using adhesive gel materials as shown in Patent Document 2, it is difficult to form high-resolution images due to the stickiness of the surface, making it challenging to ensure the quality necessary to permanently preserve personal creations as products.

[0005] The technology described in Patent Document 1 proposes a bitter layer that can withstand washing, but with a thick gel sheet, the sides are exposed, making it susceptible to damage from washing and friction. Furthermore, simply including the chemical in the adhesive layer, as in Patent Document 3, makes it difficult to maintain the overall design, including the sides of a thick gel. Therefore, there was a need to realize a structure that could maintain adhesive strength and safety functions even after washing, including side protection. [Means for solving the problem]

[0006] To achieve this objective, one aspect of the present invention includes the steps of cutting an adhesive gel sheet into a desired shape, forming an image on a surface with reduced adhesiveness and applying a bittering agent, and further forming a transparent protective layer that continuously covers the surface and the sides of the gel sheet. This achieves both improved printing accuracy through surface treatment and retention of the image and bittering agent by the transparent protective layer that covers the sides, while maintaining the property that the adhesive strength is restored by washing, and permanently protecting the design and safety functions of a thick gel sheet. [Effects of the Invention]

[0007] According to the present invention, surface treatment of the gel sheet suppresses its tackiness, enabling high-definition printing. Furthermore, by continuously covering the sides with a transparent protective layer, the tackiness can be restored after washing without impairing the image or the function of the bittering agent. This results in the technical benefit of maintaining high design quality and accidental ingestion prevention function for a long period of time in thick gel sheets. In addition, by turning personal creations into high-quality products, it is possible to achieve conversion rates and repeat purchase rates that far exceed those of conventional e-commerce, offering economic advantages. [Brief explanation of the drawing]

[0008] [Figure 1] This flowchart shows the overall process for manufacturing an adhesive gel seal according to one embodiment of the present invention. [Figure 2] This is a schematic perspective view showing the external configuration of an adhesive gel seal according to one embodiment of the present invention. [Figure 3] Figure 2 is a schematic cross-sectional view illustrating the layered structure of the adhesive gel seal. [Figure 4] This is a schematic diagram illustrating an embodiment of a cutting step in which an adhesive gel sheet is cut into a desired shape. [Figure 5] This is a schematic diagram illustrating a surface treatment step that uses alcohol to reduce the tackiness of the gel sheet surface. [Figure 6] This is a schematic diagram illustrating the printing step of forming an image on the surface of a gel sheet using a UV inkjet method. [Figure 7] This is a schematic diagram illustrating a bittering agent application step in which a solution containing a bittering component is applied to a printed surface. [Figure 8] This is a schematic diagram illustrating an embodiment of a protective layer formation step in which a transparent coating is sprayed obliquely onto the surface and sides of a gel sheet. [Figure 9] This is an explanatory diagram showing how the adhesive strength of the bottom surface is restored by cleaning the adhesive gel seal. [Figure 10] This is a conceptual diagram illustrating the property of bitter components leaching from the transparent protective layer under humid conditions. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the drawings (Figures 1 to 10).

[0010] Figure 1 shows the overall steps of a method for manufacturing an adhesive gel seal 100 according to one embodiment of the present invention (see Figures 5 and 7).

[0011] The adhesive gel seal 100 is a decorative or affixing member mainly composed of a gel-like material having adhesiveness.

[0012] The overall layer structure of the adhesive gel seal 100 in this embodiment will be described using FIGS. 2 and 3.

[0013] The adhesive gel seal 100 is configured with a gel main body 10 serving as a base material as the core.

[0014] The gel main body 10 is formed of a material having flexibility and adhesiveness by itself.

[0015] As the material of the gel main body 10, silicone-based gels, urethane-based gels, acrylic-based gels, etc. are used.

[0016] Silicone-based gels are excellent in heat resistance and chemical stability, and have the property of little deterioration even in long-term use.

[0017] Urethane-based gels have high shock absorbency and appropriate surface adhesiveness, and can provide a unique sense of elasticity.

[0018] Acrylic-based gels have high transparency and are advantageous in enhancing the visibility of the design (see FIG. 6) described later.

[0019] These gel materials are appropriately selected according to the application and the required feel.

[0020] Due to its adhesiveness, the gel main body 10 can be repeatedly pasted and peeled off on a smooth surface (see FIG. 9).

[0021] In this embodiment, the gel main body 10 is formed to have a predetermined thickness (see FIG. 4).

[0022] The thickness of the gel body 10 is preferably set to 0.2 mm or more and 10 mm or less, and more preferably to 3 mm or more and 10 mm or less.

[0023] By making the thickness 0.2 mm or more, it becomes easier to secure side surfaces 15 that connect the surface and bottom of the gel body 10, and it becomes easier to appropriately realize the configuration of the present invention in which the transparent protective layer 13 is continuously covered from the surface to the side surfaces 15. This makes it possible to suppress the exposure of stickiness on the side surfaces 15, suppress the adhesion of dirt, and maintain the design. In addition, compared to extremely thin film-like members, it is easier to maintain the desired shape 16 after cutting, and each process of surface treatment, printing, and protective layer formation can be carried out stably. On the other hand, by making the thickness 3 mm or more, it is possible to give a three-dimensional feel that is not present in conventional thin stickers. This thickness enhances the visual presence and makes character shapes and the like stand out more, and also provides users with a pleasant cushioning feeling when touched with fingers and an easy grip when peeling from the adhesive surface.

[0024] By keeping the thickness of the gel-based component 10 to 10 mm or less, excessive protrusion from the application surface is suppressed, ensuring stability during use. This thickness range optimizes the balance between the flexibility of the seal and the holding force due to its own weight.

[0025] The thick gel-based material 10 exhibits a unique texture even on its side surfaces 15 (see Figure 8).

[0026] The bottom surface of the gel body 10 functions as an adhesive surface 11 for adhering to the object to be attached (see Figures 2 and 3).

[0027] The adhesive surface 11 utilizes the inherent adhesive strength of the gel material and has excellent re-peelability with minimal adhesive residue.

[0028] On the surface side of the gel body 10, a surface is provided for the formation of the image layer 12, which will be described in detail later.

[0029] Thus, the adhesive gel seal 100 is defined as a thick, three-dimensional structure as shown in Figure 2.

[0030] Next, the initial steps for manufacturing such an adhesive gel seal 100 will be described according to the flow chart shown in Figure 1.

[0031] First, a step is taken to prepare the adhesive gel sheet that will serve as the material.

[0032] Gel sheets are made by molding materials such as silicone, urethane, and acrylic, as mentioned above, into a sheet shape.

[0033] This gel sheet is pre-adjusted to a desired thickness (preferably 0.2 mm to 10 mm, more preferably 3 mm to 10 mm).

[0034] A release liner is attached to the bottom of the gel sheet for protection during transportation and processing.

[0035] The release liner prevents dust from adhering to the adhesive surface 11 and prevents unintended adhesion without impairing the adhesive strength of the adhesive surface 11.

[0036] A cutting step 201 is performed on the prepared gel sheet, as shown in Figure 4.

[0037] The cutting step 201 is a process for cutting the gel sheet into the desired shape 16.

[0038] In this process, the cutting means 20 is used.

[0039] Examples of cutting means 20 include laser processing machines, cutting plotters, and die cutters.

[0040] When a laser processing machine is used as the cutting means 20, it is possible to cut out even complex contour lines with high precision.

[0041] Laser thermal processing smooths the side surface 15, which is the cut end of the gel-based body 10.

[0042] The cutting method 20, which uses a cutting plotter or blade, enables efficient cutting during mass production.

[0043] The desired shape 16 formed by the cutting step 201 includes a variety of variations.

[0044] Examples of desired shapes 16 include character shapes such as animals or fictional creatures.

[0045] Furthermore, it is possible to generate the desired shape 16 to match the design, such as a logo, text, or geometric pattern.

[0046] In cutting step 201, the material is completely separated into individual pieces in preparation for the printing process described later (see Figures 1 and 4).

[0047] Alternatively, the method may include half-cutting only the gel body 10 while leaving the release liner in place.

[0048] This cutting process determines the outline of the adhesive gel seal 100 as a product.

[0049] The cut gel body 10 will have side surfaces 15 with a cross-sectional area corresponding to its thickness (see Figure 2).

[0050] The side surface 15 is configured as a wall connecting the top and bottom surfaces of the gel body 10.

[0051] The presence of this side 15 gives the adhesive gel seal 100 a distinctive sense of volume.

[0052] After the cutting into the desired shape 16 is complete, the individual gel bodies 10 are transported to the next process.

[0053] Even during transport, the adhesive surface 11 on the bottom remains protected by the release liner.

[0054] This prevents foreign matter from getting into the adhesive surface 11 and prevents a decrease in adhesive strength.

[0055] The material properties of the gel-based material 10 will be described in more detail below.

[0056] When silicone-based gels are used as the main component, the balance between flexibility and shape recovery is extremely good.

[0057] Silicone-based gels offer a pleasant rebound when pressed with a finger, giving them a feel similar to a stress-relieving toy.

[0058] When a urethane-based gel is selected, it is possible to achieve both higher adhesive strength and transparency.

[0059] Urethane-based gels exhibit extremely high adsorption force to smooth surfaces such as walls and window glass.

[0060] When using acrylic gel, it offers excellent lightfastness and minimizes yellowing caused by sunlight.

[0061] In any of these materials, by giving it a thickness of 0.2 mm or more, a structure is formed in which the gel main body 10 has sides 15, making it easier to impart functionality from the surface to the sides 15.

[0062] In particular, when the thickness is 3 mm or more, stress distribution within the gel is improved, resulting in enhanced durability (see Figure 3).

[0063] Furthermore, if the thickness is 3 mm or more, it also contributes to the ease of gripping when peeling the adhesive gel seal 100 from the surface to which it is applied.

[0064] By holding the side 15 with your fingertips, you can easily perform the peeling operation without using your fingernails.

[0065] The high processing accuracy achieved by the cutting means 20 directly impacts the quality of the finished adhesive gel seal 100.

[0066] Smoothness of the cut is particularly important for desired shapes 16 (see Figure 4) that include complex curves, such as character shapes.

[0067] The uniformity of the cross-section obtained in the cutting step 201 also affects the coating performance in the subsequent protective layer formation step 205 (see Figure 8).

[0068] This is because the vertical and smooth formation of the side surface 15 enables the formation of a uniform layer.

[0069] Thus, material preparation and precise cutting are fundamental to the manufacture of the adhesive gel seal 100 (see Figure 1).

[0070] Once the physical form of the gel-based material 10 is established, subsequent steps such as design application, bittering agent application step 204, and protective layer formation step 205 (see Figures 7 and 10) can be performed effectively.

[0071] Careful attention is also paid to protecting the adhesive surface 11, including the selection of the material for the release liner.

[0072] Release liners are typically made of silicone-treated paper or film.

[0073] This makes it possible to maintain a consistent quality of the adhesive surface 11 until the final stage of the manufacturing process.

[0074] As described above, the adhesive gel seal 100 (see Figure 2) has a gel body 10 having a specific material and thickness, and a desired shape 16 at its core.

[0075] This initial configuration (see Figure 3) supports the cushioning and three-dimensional feel, which are the added value of the final product.

[0076] As shown in Figure 5, in the surface treatment step 202, the surface of the gel body 10 is treated with alcohol 30. This treatment is extremely important in order to temporarily suppress the high tackiness inherent in the gel body 10 and improve the ink adhesion in the subsequent printing process.

[0077] The gel base 10 is composed of silicone-based, urethane-based, or acrylic-based materials, and its surface has very high tackiness. While this tackiness is advantageous when used as a product, it hinders ink leveling during printing. Therefore, the surface treatment step 202 reduces the tackiness to prevent transport errors and contact problems with the print head inside the printing press.

[0078] In the surface treatment step 202, the surface of the gel body 10 is wiped with a cloth or material impregnated with alcohol 30, thereby removing oil and mold release components from the surface and achieving cleanliness. As for the type of alcohol 30, one that is highly volatile and does not easily remain on the surface of the gel body 10 after treatment is selected, such as ethanol or isopropyl alcohol.

[0079] The degreasing treatment with alcohol 30 also plays a role in adjusting the surface energy of the gel-based material 10. By adjusting the surface energy to the appropriate level, the ink dots ejected from the UV inkjet device 40 are able to wet and spread properly.

[0080] Microscopically, the surface of the gel-based material 10, after surface treatment step 202, changes to a state where ink can easily penetrate or has a high affinity for ink. This directly leads to improved printability.

[0081] Next, prior to the printing step 203 (see Figure 6), a cleaning process is performed to remove fine dust from the surface of the gel body 10. This cleaning is an essential process for forming a high-resolution image layer 12.

[0082] As a specific example of the cleaning process, ultrasonic cleaning using a cleaning solution 80 (see Figure 9) is employed. In ultrasonic cleaning, physical vibrations are applied to the gel-based material 10 immersed in the cleaning solution 80, which lifts and removes fine debris embedded in the surface irregularities.

[0083] By using ultrasonic cleaning, it is possible to remove even submicron-sized particles that cannot be removed by manual wiping. This minimizes the occurrence of pinholes and color unevenness in the image layer 12.

[0084] After cleaning, any moisture 90 and cleaning solution 80 adhering to the surface of the gel-based material 10 are completely removed by air blowing using clean air or by heat drying (see Figure 9). This is because any remaining liquid on the surface can cause poor ink curing.

[0085] The cleaned gel body 10 is transported to the UV inkjet device 40, as shown in Figure 6. Here, ink according to the desired design is ejected onto the upper surface of the gel body 10.

[0086] The UV inkjet device 40 is equipped with multiple ink heads and can eject not only the basic colors of cyan, magenta, yellow, and black, but also white ink and clear ink as needed.

[0087] In the printing step 203, ink is applied to the surface of the gel body 10 without contact, so the image layer 12 can be formed in an accurate position without distorting the flexible gel body 10.

[0088] The ink ejected from the UV inkjet device 40 is a UV-curable ink that hardens instantly upon exposure to ultraviolet light. Unlike solvent-based inks, this ink has the advantage of significantly reducing drying time.

[0089] In the process of forming the image layer 12, ultraviolet light is irradiated from a UV lamp or UV-LED immediately after the ink hits the surface. This causes the ink dots to adhere to the surface of the gel body 10 before they spread excessively, maintaining a sharp outline.

[0090] The gel core 10 is extremely flexible and can be easily stretched or compressed by external forces. Therefore, the ink film constituting the image layer 12 requires a high degree of flexibility to follow the deformation of the gel.

[0091] The UV-curing ink used in this process is designed to maintain high stretchability even after curing. Specifically, it has the characteristic of being resistant to cracking and peeling in the image layer 12 even when the gel-based material 10 is stretched to about 200 percent.

[0092] This flexible ink property allows the printed image to maintain its beauty without being damaged, even when the adhesive gel seal 100 (see Figure 2) is applied to a curved surface or pressed firmly with a finger.

[0093] The image layer 12 is formed as a high-definition full-color image. The amount of ink ejected in the UV inkjet device 40 is precisely controlled on a dot-by-dot basis based on the image data. This allows for faithful reproduction of gradients and the complex colors of characters, enabling a wide range of expressions from realistic, photographic to sharp, anime-style.

[0094] By adopting an inkjet method, it is possible to quickly print optimal designs tailored to individual desired shapes (see Figure 4) while keeping costs down even in high-mix, low-volume production.

[0095] To elaborate on the fixing mechanism, first, the surface treatment step 202 with alcohol 30 (see Figure 5) exposes the polar groups of the gel main body 10 or removes surface contaminants, thereby increasing the physical contact area with the ink. This treatment with alcohol 30 is not merely cleaning, but also slightly affects the crosslinking density of the gel surface, resulting in a "priming effect" that controls the wetting and spreading of the ink.

[0096] Next, the monomer components contained in the UV-curing ink penetrate slightly into the surface layer of the gel-based body 10 during the curing process, exhibiting an anchoring effect that results in strong adhesion.

[0097] Furthermore, a chemical reaction caused by UV irradiation causes polymerizable compounds in the ink to form a cross-linked structure, creating a robust image layer 12. This layer is designed with compatibility in mind with the bittering agent 14 (see Figures 7 and 10) and the transparent protective layer 13 (see Figure 8) that will be added in later processes.

[0098] The thickness of the image layer 12 (see Figure 3) is controlled to a range of several microns to several tens of microns in order to ensure durability while not compromising the aesthetic appearance. If a white ink underlayer is formed, the thickness increases accordingly, improving color development.

[0099] The entire process from the surface treatment step 202 to the printing step 203 (see Figure 1) is preferably carried out in a cleanroom or dust-free environment. This is to prevent airborne dust from re-adhering to the gel body 10.

[0100] Using an electrostatic removal device immediately before the printing step 203 is also an effective means of suppressing the phenomenon in which the gel body 10 becomes charged and attracts dust, thereby obtaining a high-quality image layer 12.

[0101] Even when the gel-based material 10 has thickness, focused and sharp printing can be achieved by adjusting the head height of the UV inkjet device 40. Figure 6 shows the state in which the optimal gap is maintained.

[0102] The formed image layer 12 is adjusted to have physical properties close to the elastic modulus of the gel-based material 10 (see Figure 3). This reduces the risk of interfacial delamination due to differences in hardness between materials.

[0103] The adhesion strength of image layer 12 has reached a level that demonstrates high peel resistance, as seen in cross-cut tests based on JIS standards. This is a result of the surface preparation performed in surface treatment step 202.

[0104] The treatment time with alcohol 30 is optimized to range from a few seconds to a few minutes depending on the material of the gel base 10 (see Figure 5). Since prolonged immersion may cause the gel base 10 to swell, appropriate wiping control is performed.

[0105] The alcohol 30 used in surface treatment step 202 may be reused, but fresh alcohol 30 is always supplied for the final wipe. This completely prevents the re-adhesion of oil.

[0106] The number of passes in printing step 203 (see Figure 6) is determined by the balance between the required image quality and production speed. In high-quality mode, deeper colors and a smoother texture can be achieved by layering prints from multiple directions.

[0107] A major advantage of the UV curing method is that it eliminates the need for a drying process for the image layer 12. Immediately after passing through the UV lamp, the process can proceed to the next bittering agent application step 204 (see Figures 7 and 10).

[0108] Generally, the printing area is limited to the flat upper surface to prevent ink from seeping onto the sides 15 of the gel body 10. However, the edges of the image layer 12 are formed in a smoothly tapered shape, which improves resistance to peeling (see Figures 2 and 8).

[0109] To ensure more reliable fixation of full-color images, ultraviolet light in a specific wavelength range is sometimes selectively irradiated. This achieves both deep curing within the ink and tack-free surface treatment.

[0110] The components that make up image layer 12 use only chemical substances whose safety has been confirmed, and a level of low toxicity is ensured that it can be applied to children's products such as toys without any problems.

[0111] The cleaning solution 80 (see Figure 9) used in ultrasonic cleaning is pure water or an aqueous solution containing a small amount of surfactant. This is selected to effectively remove dirt without adversely affecting the physical properties of the gel-based material 10.

[0112] The cleaning step (see Figure 9) can be performed not only with a single tank but also with a multi-stage cleaning process using multiple tanks. By removing coarse debris in the first stage and performing a final cleaning in the last stage, a higher level of cleanliness can be achieved.

[0113] The surface, whose tack has been reduced in surface treatment step 202, becomes temporarily nearly non-sticky. This state is maintained for a short time until the ink lands and hardens, supporting high-quality dot formation.

[0114] The synchronized control of the ejection timing of the UV inkjet device 40 and the irradiation timing of ultraviolet light is one of the factors that determine the glossiness of the image layer 12. Delaying the irradiation increases the glossiness, while accelerating it results in a matte texture.

[0115] Even when the thickness of the gel body 10 is between 0.2 mm and 10 mm, the surface treatment step 202 acts mainly on the surface, so that the flexibility of the gel body 10 can be maintained while ensuring the printability required for subsequent processes. In particular, when the thickness is between 3 mm and 10 mm, the cushioning properties of the entire gel body 10 are not impaired.

[0116] The color gamut of image layer 12 is optimized by a dedicated profile setting. Color correction is performed taking into account the subtle transparency and color tones of the gel-based material 10.

[0117] The fixation of high-resolution full-color images is supported not only by chemical bonding but also by physical interlocks resulting from fine surface roughening. Alcohol 30 helps expose these fine structures.

[0118] In printing step 203, it is possible to give the image a three-dimensional texture by applying thick-layer printing only to specific areas. This is an expression unique to the UV inkjet method.

[0119] Although the surface condition of the gel body 10 (see Figure 4) cut by the cutting means 20 may vary slightly from lot to lot, the surface treatment step 202 ensures that the gel always has consistent printability before proceeding to the printing process.

[0120] By controlling the amount of alcohol 30 applied and the wiping pressure with an automated device, it is possible to eliminate human error and provide a stable quality adhesive gel seal 100 (see Figure 1).

[0121] If the printing step 203 is performed without sufficient drying after washing, the moisture 90 may inhibit the polymerization of the ink. Therefore, it is desirable to incorporate a rapid drying process using an infrared heater or the like.

[0122] Image layer 12 has strong resistance to deterioration over time and fading due to sunlight (see Figure 3). By using UV ink containing pigment components with excellent lightfastness, a design that can withstand long-term use is achieved.

[0123] The design philosophy of the flexible ink is based on a scientific analysis of the dynamic behavior of the gel-based material 10 (see Figure 3). By including monomers with a low crosslinking density in the formulation of the image layer 12, the image layer 12 itself has rubber-like elasticity, allowing it to continuously follow both stretching and returning to its original shape.

[0124] To prevent nozzle clogging in the UV inkjet device 40 used in printing step 203, regular cleaning and an ink circulation system are in operation (see Figure 6). The UV light source is selected to have an optimal wavelength peak around 395 nm, depending on the type of ink.

[0125] The alcohol 30 vapor generated in the surface treatment step 202 is properly treated by the exhaust system (see Figure 5). The reduction in tack due to the surface treatment step 202 also contributes to improving the accuracy of position detection by sensors in the printing press, such as reflective sensors.

[0126] In designs that take advantage of the transparency of the gel-based material 10, settings are also made to allow a portion of the image layer 12 to pass through (see Figure 2). Even when the printed image layer 12 is completely hardened, it feels appropriately flexible to the touch, harmonizing with the tactile feel of the gel-based material 10.

[0127] One element for achieving high-definition printing is the method of fixing the gel body 10 within the UV inkjet device 40, and measures are taken to maintain flatness using a vacuum suction table or the like (see Figure 6). The resolution in the printing step 203 can be set to a high resolution, for example, from 600 dpi to 1200 dpi.

[0128] The dust removed in the cleaning step includes skin flakes, clothing fibers, and fine plastic powder (see Figure 9). Complete removal of these is essential to prevent defects in the image layer 12, and the ultrasonic cleaning output is adjusted to a moderate strength that removes only the foreign matter without damaging the surface of the gel body 10.

[0129] In the surface treatment step 202, cleaning with alcohol 30 removes the thin oil film that forms during the manufacturing of the gel base 10 (see Figure 5). The treatment is carried out for a short time to prevent the alcohol 30 from excessively penetrating the interior of the gel base 10, and the key design point is to efficiently modify only the surface.

[0130] The improved affinity in the fixation mechanism of image layer 12 is achieved by optimizing hydrophobic interactions at the molecular level. The image layer 12 firmly adheres through a mechanical bonding force, or fastener effect, created when the ink penetrates and hardens in the fine pores of the gel body 10 (see Figure 3).

[0131] By the time printing step 203 is complete, the image layer 12 is already firmly attached to the gel body 10 (see Figure 1). However, it is only after the subsequent protective layer formation step 205 (see Figure 8) that the ultimate durability of the adhesive gel seal 100 is achieved.

[0132] The vibrant colors of a full-color image appear due to multiple reflections occurring within the image layer 12. To enhance this reflection efficiency, the smoothness of the surface of the underlying gel-based material 10 is crucial.

[0133] Temperature control of the cleaning solution 80 during the cleaning step is also important (see Figure 9). Using warm water at around 40 to 50 degrees Celsius increases the rate of dirt removal and shortens the cleaning time.

[0134] The flexibility-following properties of this ink are particularly valuable when the adhesive gel seal 100 (see Figure 2) undergoes significant deformation during removal. This ink prevents the image from cracking or tearing when the seal is peeled off the backing paper.

[0135] To maintain high-definition full-color images, the storage conditions of the ink are also controlled. A supply system with thorough temperature and vibration control supports the quality of image layer 12.

[0136] Although the surface treatment step 202 (see Figure 5) can be performed manually, productivity can be improved by using an automated machine that continuously processes the surface by impregnating a rotating roller-shaped component with alcohol 30.

[0137] During the printing step 203 (see Figure 6), printing the four corners of the gel body 10 as reference marks improves the alignment accuracy in the subsequent cutting step 201 (see Figure 4) and inspection process.

[0138] Since the image layer 12 formation process is based on digital data, it can easily handle variable printing, where different names or numbers are printed on each individual sticker.

[0139] The treatment with alcohol 30, which temporarily neutralizes the tackiness of the gel-based material 10, also has the effect of making it easier for the transparent coating 60 to spread to the sides 15 in the subsequent protective layer formation step 205 (see Figure 8).

[0140] In the drying process after ultrasonic cleaning, a process is incorporated in which ionized air is blown onto the surface of the gel-based material 10 to remove static electricity and completely prevent re-contamination (see Figure 9).

[0141] The ink used in image layer 12 has robust surface strength, capable of withstanding thousands of reciprocating friction cycles in an abrasion resistance tester. This is due to the high crosslinking density achieved through UV curing.

[0142] The series of steps (see Figure 1) consisting of surface treatment step 202 with alcohol 30, a washing step, and a printing step 203 makes it possible to create a "washable, high-resolution sticker" which was difficult to achieve with conventional gel products.

[0143] The final level of completion of the fixation mechanism is demonstrated by the fact that the image layer 12 forms a smooth interface (see Figure 3) with the gel body 10, as if it were integrated with it.

[0144] Step 204 is performed on the surface of the gel body 10 on which the image layer 12 is formed, to apply a bittering agent to enhance safety.

[0145] In the bittering agent application step 204, a bittering agent solution 50 containing a bitter component is used.

[0146] The bittering agent solution 50 is a solution in which a functional material is dissolved in a solvent to prevent accidental ingestion by infants and young children (see Figure 10).

[0147] Specific examples of bittering agents 14 include compounds with extremely strong bitterness, such as denatonium benzoate.

[0148] Denatonium benzoate has the property of causing humans to perceive a strong bitter taste even at extremely low concentrations.

[0149] As the solvent for the bittering agent solution 50, it is preferable to use alcohol 30, which has excellent quick-drying properties.

[0150] By supplying the bittering agent 14 as a solution of alcohol 30, it becomes possible to rapidly accelerate the drying of the image layer 12 after application.

[0151] Figure 7 shows an embodiment of the bittering agent application step 204, in which the bittering agent solution 50 is applied to the surface on which the image layer 12 is printed.

[0152] Specific treatment methods in the bittering agent application step 204 include spraying, coating, or immersion.

[0153] In the spraying process, the bittering agent solution 50 is atomized into a fine mist and sprayed onto the surface of the image layer 12 using a spray nozzle 70.

[0154] The spraying by the spray nozzle 70, performed after the cutting step 201 (see Figure 4) and the surface treatment step 202 (see Figure 5), has the advantage of uniformly distributing the bitter components even to the image layer 12 having the desired shape 16 (see Figure 7).

[0155] In the coating process, the bittering agent solution 50 is spread thinly onto the image layer 12 using a brush, roller, or coating device.

[0156] When using a coating method, it becomes easier to precisely control the amount of bittering agent 14 applied.

[0157] In the bittering agent application step 204, the affinity between the ink constituting the image layer 12 formed by the UV inkjet device 40 in the printing step 203 (see Figure 6) and the bittering agent solution 50 is taken into consideration (see Figure 1).

[0158] The bittering agent solution 50, which uses alcohol 30 as a solvent, exhibits good wettability to the surface of the image layer 12 formed with UV-curing ink or the like.

[0159] After the bittering agent solution 50 is supplied to the surface of the image layer 12, a drying process is performed to remove the solvent.

[0160] The drying process can be done by natural drying or by forced drying using hot air or a heater.

[0161] As the solvent evaporates, the bittering agent 14 is arranged on the surface of the image layer 12 in the form of fine crystals or thin films.

[0162] The bittering agent 14 is temporarily held in an exposed state on the outermost surface of the image layer 12.

[0163] In this state, the bittering agent 14 settles into the uneven structure of the image layer 12.

[0164] Next, in the protective layer formation step 205, a transparent protective layer 13 is formed using transparent paint 60 so as to continuously cover the image layer 12 and the side surface 15 on which the bittering agent 14 is placed (see Figure 8).

[0165] The transparent protective layer 13 serves to protect the image layer 12 and the bittering agent 14 from the external environment.

[0166] The bittering agent 14 is positioned inside the transparent protective layer 13, that is, near the interface with the image layer 12.

[0167] Alternatively, a portion of the bittering agent 14 may be held in a state where it is diffused inside the transparent protective layer 13.

[0168] By forming a transparent protective layer 13, the bittering agent 14 is protected from peeling or falling off.

[0169] In the cross-sectional configuration shown in Figure 3, the bittering agent 14 is present in a layered manner between the image layer 12 and the transparent protective layer 13.

[0170] The arrangement of the bittering agent 14 does not necessarily have to be in a continuous layer, but may be in a scattered, island-like form.

[0171] The transparent protective layer 13 has the property of permeating or absorbing external moisture 90 under specific conditions, and functions even when cleaning with cleaning solution 80 (see Figure 9) (see Figure 10).

[0172] In a dry environment, even if the surface of the transparent protective layer 13 is touched, the bittering agent 14 placed inside it is blocked.

[0173] When dry fingers come into contact with the surface of the adhesive gel seal 100, the transfer of the bittering agent 14 to the fingertips is suppressed (see Figure 2).

[0174] This reduces the unpleasant sensation of unintentionally transferring a bitter taste to the hands during normal handling.

[0175] If contact with the hands is brief and the area is dry, a stable state is maintained in which no bitter components are released.

[0176] On the other hand, the adhesive gel seal 100 exhibits different behavior when placed in the oral cavity or when moisture 90 adheres to it.

[0177] When moisture 90, such as saliva, comes into contact with the surface of the transparent protective layer 13, the moisture 90 penetrates into the interior through the transparent protective layer 13.

[0178] Figure 10 shows the mechanism by which bitter components leach from the transparent protective layer 13 under humid conditions.

[0179] When moisture 90 permeates the transparent protective layer 13 and reaches the bittering agent 14, the crystals of the bittering agent 14 begin to dissolve rapidly.

[0180] The dissolved bitter components diffuse into the external moisture 90 through the transparent protective layer 13 or through the minute gaps in the layer.

[0181] As a result, an extremely strong bitter taste is instantly released in the mouth.

[0182] This bitter taste release mechanism ensures that if infants or young children accidentally ingest this product, they will immediately spit it out.

[0183] The amount of bittering agent 14 eluted can be controlled by adjusting the film thickness and density of the transparent protective layer 13.

[0184] If the transparent protective layer 13 is thin, the bitter components reach the surface in a very short time after contact with moisture 90.

[0185] It is effective to select a transparent resin with appropriate moisture absorption properties as the material for the transparent protective layer 13.

[0186] With this arrangement, the durability of the bittering agent 14 is ensured by the transparent protective layer 13, while allowing it to exhibit its function only when necessary (see Figure 3).

[0187] Compared to a configuration in which the bittering agent 14 is kneaded into the gel body 10, the configuration in which it is placed near the surface exhibits a high effect with a smaller amount.

[0188] When the bittering agent 14 is uniformly dispersed inside the gel body 10, it may take time for it to dissolve, but this configuration provides immediate effects.

[0189] Furthermore, by placing the bittering agent 14 on top of the image layer 12, safety functions can be added without compromising the aesthetic design.

[0190] Since the bittering agent 14 itself is highly transparent, it does not obscure the colors or details of the underlying image layer 12.

[0191] In the bittering agent application step 204, the intensity of the bitterness can be optimized by adjusting the concentration of the solution (see Figure 7).

[0192] Specifically, the concentration of the bittering agent solution 50 is set within the range of 0.1 weight percent to several weight percent.

[0193] When using denatonium benzoate, sufficient protection against accidental ingestion is ensured even at extremely low concentrations.

[0194] After the drying process in bittering agent application step 204 (see Figures 1 and 7), the bittering agent 14 is physically or chemically adsorbed onto the image layer 12.

[0195] The surface of the cured film of UV ink may have a fine porous structure, and the retention force is improved when the bittering agent 14 adheres to it.

[0196] During the formation of the transparent protective layer 13 in protective layer formation step 205 (see Figure 8), the transparent coating 60 integrates with the bittering agent 14 by enveloping it.

[0197] In the adhesive gel seal 100 shown in Figures 2 and 3, this sealing structure prevents the bittering agent 14 from disappearing prematurely even with repeated handling. The transparent protective layer 13 has the function of protecting the bittering agent 14 from everyday friction and light abrasion, and performs a physical protective function as a carrier.

[0198] The mechanism of bitter taste dissolution in a humid environment depends on the hydrophilicity and crosslinking density of the material of the transparent protective layer 13.

[0199] By controlling the rate at which moisture 90 diffuses into the layers, it is possible to design the timing at which taste sensations are transmitted.

[0200] In this embodiment, the permeability of the transparent protective layer 13 is adjusted so that a bitter taste is perceived immediately after putting it in the mouth.

[0201] The key feature of this configuration is that it achieves both stability in the absence of water 90 and reactivity in the presence of water 90.

[0202] As a way of holding the bittering agent 14, it is also possible to disperse it in a granular form inside the transparent protective layer 13.

[0203] In this case, instead of applying the bittering agent 14 to the image layer 12 before forming the protective layer, the bittering agent 14 may be mixed into the transparent paint 60.

[0204] However, the method of directly applying the bitter components onto the image layer 12 and then covering it with a transparent protective layer 13 allows for more reliable placement of the bitter components between the layers.

[0205] As shown in Figure 10, when water 90 covers the surface, bitter components migrate to the outside liquid due to osmosis and diffusion.

[0206] Because the eluted bitter components are highly water-soluble, they spread uniformly in liquids such as saliva and act strongly on the taste buds.

[0207] This series of actions functions as a passive safety mechanism that does not require an electrical drive.

[0208] Stability in a dry state contributes to quality preservation; for example, even if a user lightly touches the surface of the product before purchase, the transfer of bitterness can be minimized.

[0209] The bittering agent application step 204 is an important process in which the bittering agent 14 is fixed in a thin layer that does not affect the color of the image layer 12 formed through the cutting step 201 (see Figure 4), the surface treatment step 202 (see Figure 5), and the printing step 203 (see Figure 6).

[0210] As shown in Figure 9, even if cleaning with the cleaning solution 80 is performed to restore the adhesive force of the bottom surface, the bittering agent 14 protected by the transparent protective layer 13 is stably retained.

[0211] Thus, by following the steps shown in the flowchart of Figure 1, and by arranging the bittering agent 14 in a specific layer configuration as shown in Figure 10, and dissolving it in a humid environment, a safe adhesive gel seal 100 is provided.

[0212] The protective layer formation step 205 is a process of supplying transparent paint 60 to the gel body 10 using a spray nozzle 70, as shown in Figure 8. This step aims to isolate and protect the image layer 12 formed by the cutting step 201, surface treatment step 202, and printing step 203 shown in Figures 4, 5, 6, and 7, respectively, and the bittering agent 14 placed by the bittering agent application step 204, from the external environment.

[0213] The spray nozzle 70 is configured to spray the transparent coating 60 from an intentionally inclined oblique direction, rather than perpendicular to the surface of the gel body 10. This oblique spraying is essential to ensure that the sides 15 of the thick gel body 10 are properly coated.

[0214] If the gel body 10 has a thickness of, for example, 0.2 mm to 10 mm, a continuous coating including the side surface 15 can be formed by supplying the transparent coating 60 from the surface to the side surface 15. In particular, if the gel body 10 has a relatively large thickness of 3 mm to 10 mm, it is difficult to adhere a sufficient amount of transparent coating 60 to the side surface 15 by spraying from directly above. Therefore, in the protective layer formation step 205, the angle of the spray nozzle 70 is appropriately controlled and adjusted so that the transparent coating 60 is supplied uniformly to the side surface 15 as well.

[0215] The transparent protective layer 13 is formed in the protective layer formation step 205 when the transparent coating 60 hardens or dries. This transparent protective layer 13 has a sealing structure that is formed continuously without interruption from the surface to the side surface 15 of the gel body 10.

[0216] As shown in Figure 2, the sides 15 of the gel body 10 are continuously covered by the transparent protective layer 13, which prevents the inherent stickiness and tackiness of the gel material from being exposed to the outside. As a result, when handling the adhesive gel seal 100, you will not feel any unpleasant stickiness when your fingers touch the sides 15.

[0217] Furthermore, since the side surface 15 is sealed by the transparent protective layer 13, the adhesion of dust and dirt to the side surface 15 can be effectively suppressed. In thick gel products, the side surface 15 is a place where dirt is easily noticeable, but with this configuration, it is possible to maintain a clean appearance for a long period of time.

[0218] Preferably, the transparent coating 60 that forms the transparent protective layer 13 is made of a material that has enough elasticity to follow the flexibility of the gel-based material 10. This prevents cracks from forming in the transparent protective layer 13 even when the adhesive gel seal 100 is bent or deformed, and maintains a continuous covering state.

[0219] In the protective layer formation step 205, it is desirable that the spraying from an oblique direction be performed not only from a single direction, but also to surround the gel body 10 from multiple directions. Alternatively, a method can be employed in which the gel body 10 is rotated while the spray nozzle 70 is fixed, thereby uniformly coating all sides 15.

[0220] In the cross-sectional structure shown in Figure 3, the transparent protective layer 13 is positioned to completely cover the image layer 12 and the bittering agent 14. This structure prevents the dyes of the image layer 12 and the components of the bittering agent 14 from directly leaking to the outside or being lost due to abrasion.

[0221] Next, we will describe the characteristics obtained by cleaning with the cleaning solution 80. As shown in Figure 9, even if dust and other debris adhere to the adhesive surface 11 on the bottom of the adhesive gel seal 100 during use, causing a decrease in adhesive strength, it is possible to clean it using the cleaning solution 80.

[0222] The cleaning solution 80 can be water, lukewarm water, or a diluted neutral detergent. By immersing the adhesive gel seal 100 in the cleaning solution 80 or gently rubbing it under running water, foreign matter adhering to the adhesive surface 11 can be physically removed.

[0223] In this cleaning process, the sealing structure of the transparent protective layer 13 plays a crucial role. Because the surface and sides 15 of the gel body 10 are protected by the transparent protective layer 13, the cleaning solution 80 can be prevented from penetrating the internal image layer 12 and bittering agent 14.

[0224] In particular, even if the bittering agent 14 is a highly water-soluble component, the transparent protective layer 13 acts as a barrier to prevent contact with the washing solution 80, thus preventing the bittering component from being washed away and losing its effect.

[0225] The adhesive surface 11 has the property of restoring its original adhesive strength after dirt is removed by the cleaning solution 80 and then it dries. Due to this adhesive strength restoration property, the adhesive gel seal 100 is not disposable and can be repeatedly applied to various places for enjoyment.

[0226] Even after repeated washing, the transparent protective layer 13 adheres firmly to the gel base 10, retaining the image layer 12 and bittering agent 14 without peeling off. This durability is an important factor in extending the product lifespan.

[0227] When the image layer 12 is formed with UV-curing ink or the like, the transparent protective layer 13 also functions as a protective film from ultraviolet rays and has the effect of suppressing image fading. As a result, the design quality is less likely to be compromised even when used in environments close to outdoors.

[0228] The thickness of the transparent protective layer 13 can be controlled by adjusting the amount and duration of spray from the spray nozzle 70. An optimal thickness is set that maintains transparency while ensuring sufficient protective performance.

[0229] Quality control, such as sampling inspections, is performed to confirm the formation state of the transparent protective layer 13 on the side surface 15. If the spraying from an oblique direction is proper, a uniform film thickness can be confirmed across the entire surface of the side surface 15.

[0230] The viscosity of the transparent paint 60 is adjusted so that it does not drip when sprayed at an angle and spreads smoothly on the side surface 15. As a result, the transparent protective layer 13 is formed even on the finest details of the side surface 15, which has a complex cut shape.

[0231] In this embodiment, the protective layer formation step 205 (see Figure 1) can be performed not only by manual spray application but also by an automated spraying device on an automated conveyor line. In this case, by arranging multiple spray nozzles 70 at different angles, the entire surrounding area can be efficiently covered.

[0232] To elaborate on the exposure state of the adhesive surface 11, in the protective layer formation step 205, masking is performed using a release liner or a special jig to prevent the transparent paint 60 from adhering to the adhesive surface 11 on the bottom.

[0233] This results in a functional adhesive gel seal 100 (see Figure 2) in which only the bottom surface retains its adhesive properties, while the top and sides 15 are covered with a non-adhesive transparent protective layer 13.

[0234] This structural difference allows users to peel off the adhesive gel seal 100 smoothly without feeling any resistance from the adhesive, even when placing their fingers on the side 15.

[0235] Maintenance with cleaning solution 80 (see Figure 9) is effective not only for restoring adhesive strength but also for maintaining the overall cleanliness of the product. Because the surface of the transparent protective layer 13 is smooth, dirt is easily removed and it dries quickly.

[0236] In a configuration where the bittering agent 14 is positioned directly beneath the transparent protective layer 13, the transparent protective layer 13 may be designed to have fine permeability. This controls the intrusion of moisture 90 (see Figure 10) when it enters the mouth, helping to produce an appropriate bitter taste.

[0237] However, it is desirable that the transparent protective layer 13 has enough water resistance to minimize the elution of the bittering agent 14 during short-term water contact in a normal washing process.

[0238] Thus, the presence of the transparent protective layer 13 (see Figure 3) that wraps around to the side 15 is not merely an improvement in aesthetics, but is also key to achieving a high level of balance between the conflicting requirements of washability, reusability, and preservation of the internal functional layer.

[0239] To make the colors of the image layer 12 (see Figure 6) appear more vivid, the transparent protective layer 13 may contain a component that imparts gloss. This, combined with the transparency of the gel-based layer 10, results in a high-quality finish.

[0240] After the protective layer formation step 205 is completed, additional curing by heat drying or UV irradiation may be performed as needed. This can further enhance the hardness and adhesion of the transparent protective layer 13.

[0241] If the coating on the side surface 15 is incomplete, cleaning solution 80 may penetrate from there, creating a risk of delamination between the gel main body 10 and the transparent protective layer 13. The oblique spraying method of this embodiment (see Figure 8) prevents such problems from occurring.

[0242] By adjusting the spray pressure from the spray nozzle 70, the fine particles of the transparent paint 60 penetrate into the fine irregularities of the gel-based material 10, achieving high adhesion through an anchoring effect.

[0243] The continuity of the transparent protective layer 13 on the side 15 also provides the effect of preventing so-called "edge peeling," where the image layer 12 begins to peel off from the edges of the adhesive gel seal 100. This dramatically improves durability against frequent reapplication.

[0244] In cleaning tests using the cleaning solution 80, no peeling of the image layer 12 or complete disappearance of the bittering agent 14 (see Figure 7) was observed even after dozens of repeated cleanings, which supports the effectiveness of this technology.

[0245] The properties of the adhesive surface 11 can be adjusted by the formulation of the gel-based material 10 (see Figures 4 and 5), and materials with a high rate of adhesive strength recovery after washing are preferentially selected.

[0246] The transparent protective layer 13 can be made of silicone-based, urethane-based, or acrylic resin, and the optimal combination is determined based on its compatibility with the gel-based material 10.

[0247] For example, if the gel base 10 is a silicone gel, using a silicone-based coating agent in the transparent protective layer 13 increases chemical affinity, enabling extremely strong integration.

[0248] By combining this material selection with a diagonal spraying process, a new type of adhesive gel seal 100 is realized that overcomes the drawbacks of thick gels.

[0249] In the protective layer formation step 205, optimizing the atomization state of the transparent coating 60 prevents air bubbles from being incorporated into the sides 15, resulting in a beautiful finish with high transparency.

[0250] To increase the amount of transparent paint 60 adhering to the side surface 15, control may be implemented to slow down the movement speed of the spray nozzle 70 only when it passes over the side surface.

[0251] The transparent protective layer 13 also functions as a cushioning layer against external impacts, contributing to the prevention of scratches on the image layer 12. In particular, when the gel main body 10 is soft, the appropriate rigidity of the transparent protective layer 13 improves operability (see Figures 2 and 3).

[0252] Considering the possibility that cleaning solution 80 may contain alcohol components, selecting a solvent-resistant resin for the transparent protective layer 13 is also effective from the standpoint of improving durability (see Figure 5).

[0253] Regarding the retention of the bittering agent 14, it is also possible to precisely control the elution rate upon contact with moisture 90 by adjusting the density of the mesh structure of the transparent protective layer 13 (see Figure 10).

[0254] The transparent protective layer 13 on the side 15 uniformizes the refraction of light when viewed from the side of the seal, and also provides an optical effect that makes the three-dimensional image layer 12 appear more beautiful.

[0255] The protective layer formation step 205 can also be performed by arranging multiple gel components 10 at once and processing them in a single step using a large spray nozzle 70 that covers a wide area, making it suitable for ensuring mass production (see Figures 1 and 4).

[0256] Restoring adhesive strength through cleaning with cleaning solution 80 not only provides economic benefits to the user but also offers environmental advantages in the form of waste reduction (see Figure 9).

[0257] Conventional thick gel seals, which lack protection on the sides 15, had the problem of sticking to other items during storage because the sides became sticky, but this configuration eliminates that inconvenience.

[0258] The surface of the transparent protective layer 13 may be treated to be water-repellent. This makes it less likely for water droplets to remain after washing with the cleaning solution 80, and thus shortens the drying time.

[0259] At the boundary between the adhesive surface 11 and the transparent protective layer 13, that is, at the outer periphery of the bottom surface of the seal, the transparent coating 60 is designed to slightly wrap around to the bottom side, thereby preventing the edges of the protective layer from peeling off easily.

[0260] By controlling the temperature of the transparent coating 60 in the protective layer formation step 205, the fluidity during application is optimized, making it easier to form a uniform thickness even on the vertical surfaces of the side 15.

[0261] The spray pattern shown in Figure 8 is purely conceptual; in actual manufacturing environments, the spray nozzle 70 is moved along a complex trajectory to match the shape of the product.

[0262] The curing method for the transparent protective layer 13 is selected according to the characteristics of the transparent paint 60 used, such as heat curing, room temperature drying, or humidity curing.

[0263] Even if the image layer 12 consists of multiple color layers, the transparent protective layer 13 encloses them all as a single layer, preventing delamination between layers (see Figure 6).

[0264] Because cleaning with cleaning solution 80 removes bacteria and dirt attached to the surface, this configuration offers significant advantages in applications for children where hygiene is paramount.

[0265] The bottom surface, where the adhesive surface 11 is exposed, utilizes the self-adhesion properties of the gel-based material 10, eliminating the need to apply a separate chemical adhesive and resulting in minimal change in properties due to cleaning.

[0266] The transparent protective layer 13 can also be considered to function as a microcapsule throughout the entire layer, for the long-term stable retention of the bittering agent 14 (see Figure 7).

[0267] The technical feature of continuously covering the side surface 15 provides a structural sealing function that goes beyond mere coating, contributing to the high functionality of the seal.

[0268] In the automated line for the protective layer formation step 205, advanced control is possible, such as using sensors to detect the presence or absence of the image layer 12 and spraying the transparent paint 60 only in the appropriate locations.

[0269] By including maintenance guidelines with cleaning solution 80 with the product, users can restore the adhesive strength in the appropriate way and enjoy the product for a longer period.

[0270] By eliminating stickiness on the sides 15, it becomes possible to store multiple adhesive gel seals 100 in stacks, improving collectibility and portability.

[0271] The material of the transparent protective layer 13 may contain antibacterial or antiviral agents, which can further enhance hygiene after washing (see Figure 3).

[0272] The transparent coating 60 used in the protective layer formation step 205 can be a water-based coating with a low environmental impact (see Figures 1 and 8), contributing to the greening of the entire manufacturing process.

[0273] The spray angle to the side surface 15 is optimized, for example, within a range of 30 to 60 degrees, depending on the thickness of the gel base 10 (see Figure 8).

[0274] If the thickness is very large, the protective layer formation step 205 can be repeated multiple times to construct a multi-layered transparent protective layer 13, thereby further enhancing the protective capabilities of the sides 15 (see Figure 3).

[0275] Even if the image layer 12 has a three-dimensional raised surface, the oblique spraying method allows the transparent paint 60 to reach the shadowed areas hidden behind the raised surface (see Figures 6 and 8).

[0276] The effects of the cleaning solution 80 on the transparent protective layer 13 have been thoroughly verified through accelerated testing and other methods, and the design is such that it can withstand several years of normal use.

[0277] The goal is to maintain at least 90 percent of the initial state of the adhesive surface 11's recovery strength after cleaning, i.e., the recovery rate of its peel strength (see Figure 9).

[0278] The transparent protective layer 13 covers the sides 15, preventing the seal's cross-section from being directly visible from the outside. This hides any roughness in the fine cut surface of the gel-based material 10, giving the product a more polished appearance (see Figure 2).

[0279] During the protective layer formation step 205, the jig holding the gel body 10 completely covers the bottom surface, physically preventing unintended paint adhesion to the adhesive surface 11 (see Figure 8).

[0280] The presence of the transparent protective layer 13 makes it less likely for the bittering agent 14 to transfer to the hands, while also enhancing its selective functionality, which is that it only takes effect when ingested (see Figures 7 and 10).

[0281] Cleaning with cleaning solution 80 is also important for maintaining the sharpness of the image layer 12, and by removing surface cloudiness, the printed design can always be seen clearly.

[0282] In this way, the side coating with the transparent paint 60 not only solves the physical problems of the thick gel, but also contributes to maintaining the value throughout the product's life cycle (see Fig. 8).

[0283] By optimizing the curing conditions when forming the transparent protective layer 13, the bonding force at the interface with the gel body 10 is maximized, and peeling under harsh usage environments is thoroughly eliminated.

[0284] The simplicity of the cleaning process is an important factor in improving the user experience of this product, and the transparent protective layer 13 serves as the foundation to support this process (see Fig. 9).

[0285] The presence or absence of the transparent protective layer 13 on the side 15 can be easily confirmed by microscopic observation or the like, and this becomes an important indicator characterizing the quality of this product.

[0286] By optimizing the relationship between the application amount of the bittering agent 14 and the thickness of the transparent protective layer 13, it is possible to design to maintain the effect of preventing accidental ingestion for a long time while meeting safety standards (see Fig. 10).

[0287] Even when wiping off the cleaning liquid 80, since the side 15 is protected, the user is also liberated from the stress that fibers of a towel or the like adhere to the side of the gel and cannot be removed (see Fig. 9).

[0288] From the perspective of stable production, it is desirable that the spray nozzle 70 used in the protective layer formation step 205 has an automatic cleaning function to prevent clogging (see Fig. 8).

[0289] When the image layer 12 is multicolor printing, the transparent protective layer 13 protects all the inks thereof and prevents color transfer due to friction (see Fig. 3).

[0290] Even considering the effects of the cutting step 201 and surface treatment step 202 (see Figures 4 and 5) on the adhesive surface 11, the sealing structure of the transparent protective layer 13 and the resulting cleaning resistance and adhesive strength recovery characteristics are core technologies that support the reliability of the adhesive gel seal 100.

[0291] Furthermore, even if there are aspects that perform actions different from those described herein, each aspect of this embodiment is intended to address the same actions as any of those described herein, and the existence of actions different from those described herein does not mean that such methods, etc., are outside the scope of each aspect of the present invention. [Explanation of Symbols]

[0292] 10 Gel-based 11 Adhesive surface 12 Image Layers 13 Transparent protective layer 14. Bittering agent 15 Side view 16 Desired shape 20 Cutting means 30 alcohol 40 UV inkjet devices 50 Bittering agent solution 60 Transparent paint 70 spray nozzles 80 Cleaning solution 90% moisture 100 Adhesive Gel Seals 201 Cutting Step 202 Surface treatment step 203 Printing Steps 204 Step to impart bittering agent 205 Protective layer formation step

Claims

1. A manufacturing method for producing a seal from an adhesive gel sheet, A cutting step of cutting the gel sheet into a desired shape, A surface treatment step to reduce the tackiness of at least one side of the cut gel sheet, A printing step in which an image is formed on a surface whose adhesiveness has been reduced by a surface treatment step. A manufacturing method that includes this.

2. A manufacturing method according to claim 1, A manufacturing method comprising a protective layer forming step of forming a transparent protective layer that continuously covers the surface and the side surface of the gel sheet.

3. A manufacturing method according to claim 2, A manufacturing method comprising a bittering agent application step of applying a bittering agent to the surface on which the aforementioned image is formed.

4. A manufacturing method according to claim 3, The surface treatment step is a manufacturing method that includes wiping the surface of the gel sheet with alcohol.

5. A manufacturing method according to claim 3, The protective layer forming step is a manufacturing method that includes a process of coating the side surface of the gel sheet by spraying a transparent paint onto the surface of the gel sheet from an oblique direction.

6. A manufacturing method according to claim 3, A manufacturing method further comprising a washing step of washing the gel sheet before the printing step.

7. A manufacturing method according to claim 3, The manufacturing method for the gel sheet having a thickness of 0.2 mm or more and 10 mm or less.

8. A manufacturing method according to claim 3, The manufacturing method includes a step of applying a bittering agent to the surface, a powder, a liquid, or a mixture thereof containing a bittering component, and then drying it.

9. A manufacturing method according to any one of claims 1 to 8, The printing step is a manufacturing method in which the image is formed by a UV inkjet method.

10. A gel body having adhesive properties, The adhesive surface is located on the bottom surface of the gel-based body, An image layer disposed on the surface of the gel-based body, A transparent protective layer that continuously covers the surface and sides of the gel-based material, A bittering agent disposed inside or within the transparent protective layer An adhesive gel seal equipped with [a specific feature].

11. The adhesive gel seal according to claim 10, The aforementioned bittering agent is an adhesive gel seal having the property of suppressing the transfer of bitterness when in contact in a dry state, and eluting bitter components in a humid environment.

12. An adhesive gel seal according to claim 10 or 11, The aforementioned adhesive surface has the property that its adhesive strength is restored by washing. The transparent protective layer is an adhesive gel seal having a configuration that retains the image layer and the bittering agent after washing.

Images