In-mold label, method for manufacturing the same, apparatus for manufacturing the same, container having in-mold label, and method for manufacturing container having in-mold label

Abstract

The present invention relates to an in-mold label, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container having an in-mold label, and a method for manufacturing a container having an in-mold label. The invention relates to a method for easily separating a label attached to a container by an in-mold method from the container after use or when a defect occurs in the container. The present invention provides an in-mold label comprising a base paper for a label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer; and an adhesive layer coated on the air venting buffer layer, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container having an in-mold label, and a method for manufacturing a container having an in-mold label.

Description

Technology Field

[0001] The present invention relates to an in-mold label, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container having an in-mold label, and a method for manufacturing a container having an in-mold label. The invention relates to a method for easily separating a label attached to a container by an in-mold method from the container after use or when a defect occurs in the container. Background Technology

[0002] Currently, in-mold (IML) labels are widely used to attach brand labels to household goods, food, and industrial equipment, and the labels currently in use have adhesive directly applied to the inner surface of the label base paper.

[0003] The process for container and in-mold labeling via blow molding is as follows.

[0004] A label sheet coated with a printing surface on the outside and an adhesive surface on the inside is attached to a blowing mold. At this time, the outside of the label is attached to the inner wall of the mold (attached by means of a suction air passage, etc.), and the inside of the label is directed toward the internal space of the mold.

[0005] In this state, the mold is closed, and the raw material for the container (e.g., PET preform, PE parison, etc.) is placed inside. For example, the surface temperature of the PET preform is 90°C to 110°C, and the surface temperature of the PE parison is 180°C to 200°C; air is then injected into these hot raw materials to expand them (container blowing process).

[0006] As the expanded raw material of the container takes on the shape of the container to match the internal shape of the mold, it melts the adhesive surface of the label, and the melted adhesive surface adheres to the surface of the container and is firmly attached (in-mold labeling). For reference, the blow molding time for PE containers is about 10 to 15 seconds, and for PET containers it is 2 to 4 seconds.

[0007] Labels attached to molded containers using the in-mold labeling method adhere firmly to the container and do not easily detach. In other words, since the finished product cannot be permanently separated from the container, the label and container become mixed during recycling, resulting in reduced purity and making the product unsuitable for recycling, which presented a problem of being uneco-friendly.

[0008] In addition, there was a disadvantage in that during the blowing process, the adhesive layer of the label melted unevenly and adhered to the surface of the raw material of the expanding container, causing air to be trapped between the label and the container and form bubbles, which resulted in the surface becoming wrinkled, folded, or forming isolated protrusions, thereby damaging the external aesthetics or the quality of the product. Prior art literature

[0009] Japanese Patent Publication No. 3109726 (Published Sep. 14, 2000) The problem to be solved

[0010] The present invention is designed to resolve these problems and aims to provide an in-mold label that is environmentally friendly, allows for easy separation of the label attached to a plastic container when discarded after consumer use by an in-mold (IML) method, and offers high product quality by suppressing the generation of air bubbles, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container equipped with an in-mold label, and a method for manufacturing a container equipped with an in-mold label. means of solving the problem

[0011] To achieve these objectives, the present invention provides an in-mold label comprising: a base paper for a label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer; and an adhesive layer coated on the air venting buffer layer.

[0012] The above air discharge buffer layer is characterized by having a space and a partition between the space, and having elasticity to act as a buffer, cushion, or cushioning material that alleviates shock during the in-mold labeling process.

[0013] The above air discharge buffer layer is characterized by shrinking and disappearing or being absorbed into an adjacent layer when heated in a temperature range of 90°C to 200°C upon contact with the surface of the raw material of the container during the in-mold labeling process, thereby guiding air to escape to the outside of the label and preventing the formation of bubbles or wrinkles inside the label.

[0014] The above air discharge buffer layer is formed in a repeating pattern, and

[0015] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0016] The above adhesive layer is formed in a repeating pattern, and

[0017] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0018] In addition, the present invention provides a method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an air-releasing buffer layer on the primer layer; and coating an adhesive layer on the air-releasing buffer layer.

[0019] The step of coating an air discharge buffer layer onto a primer layer is implemented by transferring a pattern formed on the surface of a cylinder for coating the buffer layer onto the primer layer, wherein,

[0020] The pattern of the cylinder surface for the buffer layer coating and the pattern of the buffer layer for air discharge are characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0021] The step of coating an adhesive layer on an air discharge buffer layer is implemented by transferring a pattern formed on the surface of a cylinder for coating the adhesive layer onto the air discharge buffer layer, wherein

[0022] The pattern of the cylinder surface for the adhesive layer coating and the pattern of the adhesive layer are characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0023] It is characterized by comprising a base paper for the label; a primer layer coated on the surface of the base paper; and an adhesive layer including a pattern that forms a passage for air discharge.

[0024] The air exhaust passage is characterized by being formed to face the primer layer.

[0025] The air exhaust passage is characterized by being formed in an area opposite the primer layer that can face the container surface.

[0026] The pattern forming the air exhaust passage is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0027] The above air exhaust passage is characterized by guiding air to escape to the outside of the label and preventing the formation of bubbles or wrinkles inside the label when it is heated in a temperature range of 90°C to 200°C upon contact with the surface of the raw material of the container during the in-mold labeling process, thereby shrinking, disappearing, or being absorbed into an adjacent layer.

[0028] It is characterized by including the step of coating a primer layer on the base paper; and the step of coating an adhesive layer on the primer layer that includes a pattern forming a passage for air discharge.

[0029] The step of coating the adhesive layer is implemented by transferring a pattern formed on the surface of the cylinder for coating the adhesive layer to the primer layer, wherein the pattern on the surface of the cylinder for coating the adhesive layer and the pattern of the adhesive layer are at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0030] In addition, the present invention comprises a buffer layer cylinder that coats an air discharge buffer layer on a primer layer coated on a base paper; and an adhesive layer cylinder that coats an adhesive layer on the air discharge buffer layer, wherein at least one of the buffer layer cylinder or the adhesive layer cylinder has a pattern formed thereon for transferring a pattern for air discharge.

[0031] In addition, the present invention comprises an adhesive layer cylinder that coats an adhesive layer onto a primer layer coated on a base paper, wherein the adhesive layer has a pattern formed thereon that serves as an air discharge passage to discharge air and prevent the formation of bubbles during the in-mold labeling process, and the adhesive layer cylinder has a pattern formed thereon for transferring the pattern for air discharge.

[0032] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0033] In addition, the present invention comprises a container and an in-mold label attached to the surface of the container, wherein

[0034] An in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper;

[0035] A container having an in-mold label is provided, characterized by including an air venting buffer layer coated on a primer layer, which exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed, and an adhesive layer that is coated on the air venting buffer layer during the container manufacturing process and is located on the primer layer after the container manufacturing is completed.

[0036] At least one of the above air discharge buffer layer or adhesive layer is characterized by having a pattern formed therein that exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed, while guiding air discharge and preventing the formation of bubbles or wrinkles.

[0037] In addition, the present invention provides a container having an in-mold label, comprising a container and an in-mold label attached to the surface of the container, wherein the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; and an adhesive layer coated on the primer layer, wherein the adhesive layer is provided with a pattern that exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed, thereby releasing air and preventing the generation of bubbles.

[0038] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0039] In addition, the present invention provides a method for manufacturing a container having an in-mold label, characterized by comprising the steps of: attaching a label to a separated mold; pressing the mold together and placing the raw material of the container inside the mold; injecting air to expand the raw material; allowing the air discharge buffer layer inside the label to contract and disappear or be absorbed into an adjacent layer as the container raw material adheres to the label, thereby allowing the air inside the label to be discharged to prevent the formation of bubbles or wrinkles; and separating the mold and removing the container after the in-mold label container is completed.

[0040] In addition, the present invention provides a method for manufacturing a container having an in-mold label, characterized by comprising the steps of: attaching a label to a separated mold; pressing the mold together and placing the raw material of the container inside the mold; injecting air to expand the raw material; ensuring that the air discharge passage formed in the adhesive layer inside the label disappears or is absorbed into an adjacent layer as the container raw material adheres to the label, thereby allowing the air inside the label to be discharged and preventing the formation of bubbles or wrinkles; and separating the mold and removing the container after the in-mold label container is completed.

[0041] In addition, the present invention provides an in-mold label characterized by comprising: a base paper for a label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer; an adhesive layer coated on the air venting buffer layer; and a back-side printing layer printed on the adhesive layer.

[0042] The above air discharge buffer layer is characterized by having a space and a partition between the space, and having elasticity to act as a buffer, cushion, or cushioning material that alleviates shock during the in-mold labeling process.

[0043] The above air discharge buffer layer is characterized by shrinking and disappearing or being absorbed into an adjacent layer when heated in a temperature range of 90°C to 200°C upon contact with the surface of the raw material of the container during the in-mold labeling process, thereby guiding air to escape to the outside of the label and preventing the formation of bubbles or wrinkles inside the label.

[0044] The above air discharge buffer layer or adhesive layer is formed in a repeating pattern,

[0045] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0046] In addition, the present invention is characterized by comprising a base paper for a label; a primer layer coated on the surface of the base paper; an adhesive layer coated on the primer layer; and a back printing layer printed on the adhesive layer.

[0047] A pattern constituting an air discharge passage is formed in the adhesive layer, and the pattern is characterized as being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0048] The back printing layer is formed only on a portion of the area of ​​the adhesive layer, and the remaining portion excluding the back printing layer is characterized by the adhesive layer being exposed.

[0049] It is characterized by further including a label separation printing layer printed on the border or corner of the adhesive layer.

[0050] In addition, the present invention provides a method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an air-releasing buffer layer on the primer layer; coating an adhesive layer on the air-releasing buffer layer; and forming a back-printing layer on a portion of the adhesive layer.

[0051] The step of coating an air exhaust buffer layer onto a primer layer is implemented by transferring a pattern formed on the surface of a cylinder for coating the buffer layer onto the primer layer, wherein the pattern on the surface of the cylinder for coating the buffer layer and the pattern of the air exhaust buffer layer are at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0052] The step of coating an adhesive layer on an air discharge buffer layer is implemented by transferring a pattern formed on the surface of a cylinder for coating the adhesive layer to the air discharge buffer layer, wherein the pattern on the surface of the cylinder for coating the adhesive layer and the pattern of the adhesive layer are at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0053] The step of forming a back printing layer on the adhesive layer is implemented for a portion of the adhesive layer area, and the remaining portion excluding the back printing layer is characterized by the adhesive layer being exposed.

[0054] In addition, the present invention provides a method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an adhesive layer on the primer layer; and forming a back-side printing layer on a portion of the adhesive layer.

[0055] The step of coating the adhesive layer is implemented by transferring a pattern formed on the surface of the cylinder for coating the adhesive layer to the primer layer, wherein the pattern on the surface of the cylinder for coating the adhesive layer and the pattern of the adhesive layer are characterized as being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0056] The step of forming a back printing layer on the adhesive layer is implemented for a portion of the adhesive layer area, and the remaining portion excluding the back printing layer is characterized by the adhesive layer being exposed.

[0057] In addition, the present invention comprises a container and an in-mold label attached to the surface of the container, wherein

[0058] An in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper;

[0059] A container having an in-mold label is provided, characterized by comprising: an air venting buffer layer coated on a primer layer, which exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed; an adhesive layer that is coated on the air venting buffer layer during the container manufacturing process and is located on the primer layer after the container manufacturing is completed; and a back printing layer printed on a portion of the area of ​​the adhesive layer.

[0060] In addition, the present invention provides a container having an in-mold label, wherein the in-mold label comprises a container and an in-mold label attached to the surface of the container, the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; an adhesive layer coated on the primer layer; and a back printing layer printed on a portion of the area of ​​the adhesive layer.

[0061] The adhesive layer is characterized by having a pattern that exists during the container manufacturing process and then disappears or is absorbed into an adjacent layer after the container manufacturing is completed, thereby releasing air and forming an air discharge passage to prevent the generation of bubbles.

[0062] The back printing layer is characterized by being composed of a visible image or text.

[0063] It is characterized by including a label removal printing layer printed on the corners or edges of the adhesive layer to prevent the adhesive layer from sticking to the container surface and to provide a space to grip when removing the label. Effects of the invention

[0064] First, the in-mold label according to the present invention provides an eco-friendly effect that makes it significantly easier to separate the label from the container during the recycling process. Conventional in-mold labels were permanently fused to the surface of the container, making separation impossible; however, the present invention is designed so that the bonding force between the inner primer layer and the adhesive layer acts more strongly than the bonding force with the container surface when cooling after blow molding. Accordingly, when consumers dispose of the label or it is processed at a recycling center, it peels cleanly (Easy-Peel) without adhesive residue when the label is physically pulled, thereby securing high-purity recycled plastic raw materials and maximizing resource circulation efficiency.

[0065] Second, the present invention has the effect of significantly reducing the molding defect rate by fundamentally solving the chronic problem of air trapped inside the label during the in-mold molding process. The air-releasing buffer layer or patterned adhesive layer formed inside the label includes micro-channels such as hexagons or grids, so that the trapped air is rapidly discharged to the outside of the label through these channels the moment the container material expands and adheres to the label. This fundamentally prevents the occurrence of bubbles or wrinkles caused by the formation of air pockets, thereby enabling the manufacture of a container with a smooth and perfect surface quality.

[0066] Third, the present invention significantly improves the aesthetic perfection of the label attachment surface through a unique problem-solving principle of 'disappearance or absorption into adjacent layers and leveling.' The pattern of the air-venting buffer layer or adhesive layer performs the function of ventilation during the initial stage of molding, but when subjected to high heat (90–200°C) of the molten resin, it melts and becomes fluid, causing the pattern to collapse and become level. In this process, the label and the container are perfectly integrated without leaving any irregularities or marks on the label surface, thereby creating a luxurious appearance as if the label were printed directly on the container and conveying a high-quality product image to consumers.

[0067] Fourth, the air-venting buffer layer of the present invention provides a physical protective effect that prevents damage to the label during the robot handling and mold insertion processes, which are steps prior to the molding process. The buffer layer is configured to maintain a certain level of elasticity and cushioning function at room temperature, thereby absorbing mechanical shocks applied during the process in which a robot arm, an automated piece of equipment, picks up the label, transports it into the mold, and places it. This prevents the thin label base paper from being crumpled or torn, thereby increasing process stability and contributing to maintaining equipment operation efficiency in mass production lines.

[0068] Fifth, the present invention offers economic benefits by optimizing the performance of the functional coating layer and reducing material costs through the introduction of a primer layer. The primer layer, coated on both the surface and back of the base paper, simultaneously performs a sealing effect by filling the micropores of the base paper and acts as an anchor. This prevents the excessive absorption of expensive buffer layer solutions or adhesives into the porous paper, thereby enabling the full expression of designed properties with a small coating amount. Furthermore, it plays a key role in ensuring the durability of the label by preventing interlayer delamination.

[0069] Sixth, the present invention provides broad process compatibility that can be universally applied to plastic containers of various materials. The buffer layer and adhesive layer composition of the present invention is designed to react over a wide temperature range of 90°C to 200°C, making it applicable to both PET containers molded at relatively low temperatures (90°C to 110°C) and PE containers molded at high temperatures (180°C to 200°C). This allows container manufacturers to apply a unified label solution without having to individually change label specifications when producing containers of various materials, thereby increasing inventory management and production flexibility.

[0070] Seventh, the present invention has the effect of reducing production costs by enabling immediate reuse (re-grinding) of defective containers occurring at the production site. In the case of defective products occurring during blow molding due to reasons such as thickness defects or substandard shape, conventionally, the entire container had to be discarded or used only as low-grade recycled material because the label could not be separated. However, since the label can be easily removed from the container even immediately after manufacturing, the defective container can be immediately crushed and reintroduced as raw material, thereby minimizing raw material loss and maximizing production yield.

[0071] Eighth, the geometric pattern structures, such as hexagons and diamonds, applied in this invention provide a hydrodynamic effect that maximizes air discharge efficiency. Unlike simple straight patterns, intersecting or continuous polygonal patterns secure multiple pathways for air to escape. This prevents air from becoming trapped in any one place and ensures uniform air discharge in all directions, even if the container has a complex shape or a design with sharp curves, thereby guaranteeing defect-free, uniform adhesion quality.

[0072] Ninth, the manufacturing method of the present invention adopts a gravure or roll coating method using a specially processed cylinder to provide productivity suitable for mass production. By using a dedicated cylinder with an engraved pattern for forming a buffer layer and an adhesive layer, precise thickness control in micrometer units and uniform pattern transfer can be achieved at high speed. This not only minimizes label quality variations but also secures industrial competitiveness by increasing production speed through a continuous roll-to-roll process, thereby lowering manufacturing costs.

[0073] Tenth, the present invention is highly effective in preserving the hygiene and recycling value of containers by ensuring that no stickiness or foreign substances remain on the container surface after label removal. Thanks to a mechanism in which the adhesive layer peels off while firmly adhering to the internal primer layer, the container surface remains clean without the need for a separate washing process after the label is removed. This eliminates concerns regarding residual chemicals, particularly when recycled into food or household product containers, and fulfills an essential prerequisite for producing high-quality recycled resin (PCR).

[0074] Eleventh, the present invention forms a back printing layer on the back (inner) side of the label, so that images, letters, numbers, etc. provided by the back printing layer can be seen even on the back side of a transparent or translucent container. Therefore, by enabling the promotional effect of the label not only on the surface but also on the back side, there is an advantage of being able to increase visual aesthetics, information provision effects, and economic added value.

[0075] Twelfth, the present invention provides a label removal printing layer on the corner or edge of the label. The label removal printing layer is printed on a part of the adhesive layer, so that part does not stick to the container during in-mold labeling. This has the advantage that when removing the label later when disposing of or recycling the container, the user can easily remove the label by holding the part of the label removal printing layer and peeling off the label.

[0076] The above invention has the advantage of being able to achieve the water separation function, label removal function, and label promotion function of the label. Brief explanation of the drawing

[0077] Figure 1 is a photograph of a container with a label attached by conventional in-mold labeling and blow molding. FIG. 2 is a photograph of an in-mold label according to the present invention attached to a container. FIG. 3 is a photograph showing a portion of an in-mold label according to the present invention being easily separated from a container. FIG. 4 is an exploded perspective view of an in-mold label according to a first embodiment of the present invention. FIG. 5 is a side cross-sectional view of the base paper and the outer primer layer in an in-mold label according to the first embodiment of the present invention. FIG. 6 is a side cross-sectional view of the base paper, the outer primer layer, and the inner primer layer in an in-mold label according to the first embodiment of the present invention. FIG. 7 is a side cross-sectional view of a base paper, an outer primer layer, an inner primer layer, and an air discharge buffer layer in an in-mold label according to the first embodiment of the present invention. FIG. 8 is a side cross-sectional view of a base paper, an outer primer layer, an inner primer layer, an air discharge buffer layer, and an adhesive layer in an in-mold label according to the first embodiment of the present invention. FIG. 9 illustrates an apparatus for coating a primer layer in an in-mold label according to a first embodiment of the present invention. FIG. 10 illustrates an apparatus for coating an air discharge buffer layer in an in-mold label according to a first embodiment of the present invention. FIG. 11 illustrates an apparatus for coating an adhesive layer in an in-mold label according to a first embodiment of the present invention. FIGS. 12 and 13 illustrate the surface shape of a coating cylinder. FIG. 14 is a flowchart of the manufacturing process of an in-mold label according to the first embodiment of the present invention. FIG. 15(a) illustrates the process of manufacturing a container using an in-mold label in a blowing mold. FIG. 15(b) is a front view of a container with an in-mold label attached. FIG. 16(a) is a side cross-sectional view of an in-mold label according to a first embodiment of the present invention before it is attached to a container. FIG. 16(b) is a side cross-sectional view after an in-mold label according to the first embodiment of the present invention is attached to a container. FIG. 17 is a flowchart of a method for manufacturing a container having an in-mold label according to the first embodiment of the present invention. FIG. 18 is an exploded perspective view of an in-mold label according to a second embodiment of the present invention. FIG. 19 is a side cross-sectional view of the base paper and the outer primer layer in an in-mold label according to a second embodiment of the present invention. FIG. 20 is a side cross-sectional view of an adhesive layer having a base paper, an outer primer layer, and an air discharge passage pattern in an in-mold label according to a second embodiment of the present invention. FIG. 21 illustrates the surface shape of a coating cylinder. FIG. 22 is a flowchart of the manufacturing process of an in-mold label according to the second embodiment of the present invention. FIG. 23(a) illustrates the process of manufacturing a container using an in-mold label according to the second embodiment in a blowing mold. FIG. 23(b) is a front view of a container with an in-mold label attached according to the second embodiment. FIGS. 24(a) and FIGS. 25(a) are side cross-sectional views of an in-mold label according to a second embodiment of the present invention before it is attached to a container. FIGS. 24(b) and FIGS. 25(b) are side cross-sectional views after an in-mold label according to a second embodiment of the present invention is attached to a container. FIG. 26 is a flowchart of a method for manufacturing a container having an in-mold label according to a second embodiment of the present invention. FIG. 27 is a photograph of an in-mold label having a printed layer for label separation according to the present invention attached to a container. FIG. 28 is a photograph of a state in which a portion of the label in FIG. 27 according to the present invention is easily separated from the container. Figure 29 is a photograph of the surface and back of a label with a surface printing layer and a back printing layer printed thereon. Fig. 30 shows the front and back of a container with a label similar to that of Fig. 29. FIG. 31 is a modified side cross-sectional view of the first embodiment having a back printing layer and a printing layer for label separation. FIG. 32 is a manufacturing flowchart of a modified embodiment of the first embodiment having a back printing layer and a printing layer for label separation. FIG. 33 is a side cross-sectional view of a modified embodiment of the second embodiment having a back printing layer and a printing layer for label separation. FIG. 34 is a manufacturing flowchart of a modified embodiment of the second embodiment having a back printing layer and a printing layer for label separation. FIG. 35 is a side cross-sectional view after an in-mold label according to a modified embodiment of the first embodiment of the present invention is attached to a container. FIG. 36 is a side cross-sectional view after an in-mold label according to a modified embodiment of the second embodiment of the present invention is attached to a container. FIG. 37(a) illustrates the process of manufacturing a container using an in-mold label according to a modified example of the first and second embodiments in a blowing mold. FIG. 37(b) is a front view of a container using an in-mold label according to a modified example of the first and second embodiments. FIG. 37(c) is a rear view of a container using an in-mold label according to a modified example of the first and second embodiments. Specific details for implementing the invention

[0078] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings.

[0079] However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0080] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms.

[0081] The above terms are used solely for the purpose of distinguishing one component from another.

[0082] For example, without departing from the scope of the present invention, the second component may be named the first component, and similarly, the first component may be named the second component.

[0083] The term "and / or" includes a combination of multiple related listed items or any of the multiple related listed items.

[0084] When it is stated that one component is "connected" or "joined" to another component, it should be understood that while it may be directly connected or joined to that other component, there may also be other components in between.

[0085] On the other hand, when it is stated that one component is "directly connected" or "directly coupled" to another component, it should be understood that there are no other components in between.

[0086] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention.

[0087] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0088] In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0089] Hereinafter, embodiments will be described in detail with reference to the attached drawings, provided that identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0090] FIG. 1 illustrates a container (C) with a label (L) attached by conventional in-mold labeling and blow molding. In the case of the container (C) and label (L) shown in FIG. 1, as previously explained in the prior art, the adhesive on the inner surface of the base paper of the in-mold label (L) melts during the blow molding process and adheres firmly to the inner surface of the container. Since the adhesive is firmly attached to both the surface of the container and the inner surface of the base paper, it is difficult to remove the label.

[0091] Therefore, removing labels during plastic recycling is difficult, and recyclability is extremely low, especially since the labels do not detach from the plastic fragments during water separation (a process in which containers are crushed and placed in a sodium chloride solution to separate the labels and plastic fragments) after disposal.

[0092] In addition, if the expansion pressure is not properly controlled during blow molding or if the container adheres unevenly to the label, there is a problem where air cannot escape properly between the label and the container surface and gets trapped in between, causing bubbles or wrinkles to form on the label.

[0093] FIG. 2 shows an in-mold label (100, 200) according to the first and second embodiments of the present invention attached to a container (1), and FIG. 3 shows a state in which a part of the in-mold label (100, 200) according to the present invention is easily separated from the container (1).

[0094] The in-mold label (100, 200) according to the present invention has an easy-peel function. In the case of a PE container, the label (100, 200) is inserted into a molding die, and at a PE container molding temperature (180~200℃), the container (1) and the label (100, 200) are fused by heat and attached between 10~15 seconds depending on the size.

[0095] In PET containers, the container and the label are fused by heat and attached in 2 to 4 seconds at a molding temperature of 90 to 110°C.

[0096] As shown in FIG. 3, when the container (1) and label (100, 200) are disposed of after use, they are cleanly separated without any foreign matter residue (0%) on the surface to be attached, enabling high-purity recycling and providing excellent eco-friendly functionality.

[0097] Furthermore, during the label (100, 200) attachment process described later, air is instantly expelled through the air exhaust passage formed in the air exhaust buffer layer (150) or adhesive layer (160, 260), so there is an advantage that there is no concern about bubbles or wrinkles forming on the label (100, 200).

[0098] In addition, when defective products occur due to defects caused by various conditions during container blow molding, the label can be easily separated, allowing the defective containers to be reintroduced and immediately produced as genuine products. This offers the advantage of reducing costs and time and maximizing productivity.

[0099] FIG. 4 shows the layers of an in-mold label (100) according to the first embodiment of the present invention separated. The in-mold label (100) according to the first embodiment includes a base paper (110) in the middle and an outer primer layer (120) coated on one side of the base paper (110). Subsequently, a surface printing layer (130) on which letters or shapes are printed is provided on the outer primer layer (120), and it is preferable that this be printed after the in-mold label (100) is finally completed.

[0100] On the opposite side where the outer primer layer (120) is formed, an inner primer layer (140) coated on one side of the base paper (110), an air discharge buffer layer (150) coated on the inner primer layer (140), and an adhesive layer (160) coated on the air discharge buffer layer (150) are provided.

[0101] Here, the inner primer layer (140) and the outer primer layer (120) serve to firmly hold and fix the specific layer (printing layer, buffer layer, adhesive layer (160)) connected thereto.

[0102] The primer layer is applied to the surface of the label's base paper to mitigate the roughness of the base paper and is configured to act as an anchor to strengthen the bonding with the air venting buffer layer laminated in the subsequent process.

[0103] Specifically, the primer layer comprises one or more binder resins selected from acrylic resin, polyurethane resin, polyester resin, vinyl acetate resin, ethylene vinyl acetate (EVA) resin, and chlorinated polypropylene (CPP) resin as a main component. Preferably, a water-soluble acrylic emulsion or a solvent-based polyurethane resin may be used, taking into account penetration and drying properties with the base paper.

[0104] In addition, the primer layer may further include inorganic fillers such as silica, calcium carbonate, clay, and titanium dioxide in a range of 5 to 30 weight percent relative to the total weight to reinforce heat resistance and the strength of the coating film, and thereby has a barrier property that fills the fine pores on the surface of the base paper to prevent the buffer layer forming material from being excessively absorbed into the base paper.

[0105] Meanwhile, the air discharge buffer layer (150) is configured to have a film-forming property capable of maintaining a patterned shape and an elasticity capable of buffering against external pressure, and to have thermoplastic properties that rapidly increase fluidity under specific temperature conditions.

[0106] Specifically, the air discharge buffer layer is composed of a resin composition comprising at least one selected from ethylene vinyl acetate (EVA) copolymer, ethylene acrylic acid (EAA) copolymer, polyester-based elastomer, polyolefin-based elastomer (POE), styrene-butadiene-styrene (SBS) block copolymer, and low-density polyethylene (LDPE) wax.

[0107] The above air discharge buffer layer maintains a Shore A hardness range of 60 to 95 at room temperature (25℃) and acts as a cushion to absorb physical shock during robot handling and mold insertion processes for in-mold labeling, as well as during the contact process with the container raw material.

[0108] Additionally, the air discharge buffer layer (150) is formed by including a resin having a melting point or softening point in the range of 60°C to 150°C, so that it undergoes a phase change and melts when exposed to high heat of 90°C to 200°C transferred from the molten resin during in-mold molding. Due to these thermal properties, air is discharged through the space (151) between the patterns during the initial stage of molding, and at the time when molding is completed, the buffer layer (150) itself melts and shrinks, decomposes and disappears or is absorbed into an adjacent layer, thereby forming a smooth appearance without leaving any irregularities on the label surface and suppressing the generation of bubbles.

[0109] The adhesive layer maintains a non-tacky solid state at room temperature to facilitate the transport and handling of the label, but has heat-activated characteristics that react to heat (90°C to 200°C) transferred from the molten resin during in-mold molding to instantly exert adhesive force.

[0110] In particular, the adhesive layer of the present invention has the following key properties in addition to a simple adhesive function.

[0111] First, it possesses fluidity and leveling characteristics. Initially, the adhesive layer maintains pattern structures such as hexagons or grids to serve as air vents; however, when subjected to the heat and pressure of molten resin, it rapidly softens, causing the pattern to collapse and flatten. Through this process, it adheres seamlessly to the container surface without leaving any irregularities on the label surface after air is vented.

[0112] Second, it implements an Easy-Peel function through release control. The adhesive layer is designed to have a stronger bond with the back primer layer inside the label than with the container surface (PE, PET, etc.). In other words, when the label is removed for recycling, the adhesive layer does not remain on the container surface but is pulled off toward the label along with the back primer layer, thereby preventing contamination of the container.

[0113] Third, it has a wide temperature responsiveness. The melting point (Tm) and melt index (MI) are controlled to exhibit stable melting and bonding behavior in both the molding temperature range of PET containers (90–110°C) and PE containers (180–200°C).

[0114] Regarding the specific components and composition of the adhesive layer, the adhesive layer is composed of a composition in which a thermoplastic resin binder is the main component and a tackifier and wax are added, in order to achieve excellent compatibility with the container material (polyolefin, polyester, etc.) while realizing the leveling and easy-peel characteristics described above.

[0115] The specific composition is as follows.

[0116] - Base Resin: Accounts for 40 to 70 percent of the total weight of the adhesive layer, and at least one of ethylene vinyl acetate (EVA) copolymer, ethylene-acrylic acid (EAA) copolymer, chlorinated polypropylene (CPP), or polyester-based hot melt resin is selected. In particular, when applied to PE containers, a modified polyolefin-based resin is preferably used to ensure adhesion to the non-polar container surface.

[0117] - Tackifier: To maximize instantaneous adhesion at high temperatures, 10 to 30 weight percent of rosin ester-based, terpene-based, or petroleum resin is included. This improves wetting when the resin is melted, allowing it to penetrate even fine irregularities on the surface of the container.

[0118] - Flow modifier (Wax): 5 to 20 weight percent of paraffin wax, microcrystalline wax, or polyethylene wax is added to help with rapid collapse and leveling of the pattern. This component lowers the melt viscosity of the adhesive layer, helping to complete air evacuation and fusion within a short molding time of 2 to 4 seconds (PET) or 10 to 15 seconds (PE).

[0119] - Anti-blocking Agent: A small amount of silica or amide-based wax may be added to prevent the adhesive layers from sticking together during storage of labels wound in roll form.

[0120] Regarding the structural specifications of the adhesive layer, it has a coating thickness of 12 to 15 μm; this is the optimal thickness that is sufficient to secure air exhaust channels without compromising the appearance of the label after molding. As for the pattern shape, it is formed into continuous geometric patterns such as hexagons, grids, diamonds, and diagonals through gravure or roll coating methods, thereby constituting an air exhaust network connected in all directions.

[0121] As described later, an air discharge pattern is formed in the air discharge buffer layer (150) and the adhesive layer (160). This pattern guides the air to escape when a label (100) is attached to the container (1) following blow molding, thereby suppressing the occurrence of bubbles or wrinkles caused by residual air.

[0122] In the case of the base paper (110), it is made of a single material of PP (Polypropylene) without a backing paper (release paper), is white and transparent with a thickness of 50 to 110 μm, and has the characteristics of heat resistance, high strength, and low specific gravity (0.90 to 91).

[0123] Using FIGS. 5 to 17, the structure of an in-mold label according to the first embodiment, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container with an in-mold label attached, and a method for manufacturing the container will be described.

[0124] As illustrated in FIG. 5, an outer primer layer (120) is coated on one side (outer surface) of the base paper. The outer primer layer (120) is a coating layer for fixing printing ink, and the coating amount is approximately 3 to 5 μm. However, the range is not limited to this.

[0125] As illustrated in FIG. 6, after the structure of the base paper (110) + outer primer layer (120) made in FIG. 5 is completed, an inner primer layer (140) is coated on the other side (inner surface) of the base paper. The inner primer layer (140) is a layer created to fix the adhesive layer (160) to the base paper after the buffer layer (150) shrinks and disappears or is absorbed into an adjacent layer upon completion of the blowing process and in-mold labeling, and the coating amount is approximately 3 to 5 μm. However, the range is not limited to this.

[0126] As illustrated in FIG. 7, an air discharge buffer layer (150) is formed in the inner primer layer (140), and the air discharge buffer layer (150) provides a pattern having a three-dimensional structure, and the pattern has a space portion (151) and a partition portion (152) between the space portions (151).

[0127] The buffer layer (150) has a soft, soft, and contractible structure like a sponge, so it acts as a buffer, cushion, or cushioning material to mitigate shock during the in-mold labeling process when blow molding.

[0128] The air discharge buffer layer (150) can be heated in a temperature range of 90°C to 200°C when contact occurs with the surface of the container raw material (1a) during the in-mold labeling process, and can be guided to allow air to escape to the outside of the label (100) during that process and prevent bubbles or wrinkles caused by air trapped inside the label.

[0129] As will be described later, the air discharge buffer layer (150) is formed in a repeating pattern, and the pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0130] The amount of the air discharge buffer layer (150) applied is approximately 3 to 5 μm. However, the range is not limited to this.

[0131] The air discharge buffer layer (150) exists between the inner primer layer (140) and the adhesive layer (160) when the label (100) is manufactured, and after the in-mold labeling process is completed following the blowing process, it shrinks and decomposes, disappears, or is absorbed into an adjacent layer and is removed. At this time, the inner primer layer (140) and the adhesive layer (160) are in close contact, and the inner primer layer (140) fixes the adhesive layer (160).

[0132] The adhesive layer (160) is a layer that allows the label (100) to be attached to the surface of the container at high temperatures, and the amount of application is approximately 12 to 15 μm. However, the range is not limited to this.

[0133] The adhesive layer (160) may also provide a pattern having a three-dimensional structure, and the pattern comprises a space portion (151) and a partition portion (152) between the space portions (151). The pattern is formed as a repeating pattern, and the pattern is characterized as being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0134] FIG. 9 illustrates an apparatus for coating an inner primer layer (140) in an in-mold label (100) according to a first embodiment of the present invention. Although the process of coating the inner primer layer (140) has been described below, the following process is also applicable to an outer primer layer (120).

[0135] As the first intermediate product (base paper (110) + outer primer layer (120)) produced as shown in FIG. 5 is wound on the first rewinder roller (11), the first intermediate product is unwound and moves while being supported by the support roller in the middle.

[0136] Meanwhile, a first tank (12) containing a primer solution for forming an internal primer layer (140) is provided, and a part of a primer coating cylinder (13) is placed in the first tank (12) and rotated so that the primer solution is attached to the surface of the primer coating cylinder (13).

[0137] At this time, a first blade (17) is provided to control the thickness of the primer solution applied to the surface of the primer coating cylinder (13). When the back surface of the first intermediate paper meets the primer coating cylinder (13), the primer solution adheres to the back surface of the first intermediate paper to form an internal primer layer (140), and in this state, it passes through a first drying tunnel (16) with a heater to be dried.

[0138] After that, the second intermediate product label, having an internal primer layer (140) formed thereon, exits the first drying tunnel (16) and is wound onto the second rewinder roller (18).

[0139] FIG. 10 illustrates an apparatus for coating an air discharge buffer layer (150) in an in-mold label (100) according to a first embodiment of the present invention.

[0140] As the first intermediate product (base paper (110) + outer primer layer (120) + inner primer layer (140)) produced as shown in FIG. 6 is wound on the second rewinder roller (18), the first intermediate product is unwound and moves while being supported by the support roller in the middle.

[0141] Meanwhile, a second tank (22) containing a solution for forming an air discharge buffer layer (150) is provided, and a part of a buffer layer coating cylinder (23) is placed in the second tank (22) and rotated so that the solution for forming the buffer layer (150) is attached to the surface of the buffer layer coating cylinder (23).

[0142] At this time, a second blade (27) is provided to control the thickness of the solution adhering to the surface of the buffer layer coating cylinder (23). Then, a buffer layer transfer cylinder (25) is provided above the buffer layer coating cylinder (23) and meets the buffer layer coating cylinder (23), and the buffer layer solution in the buffer layer coating cylinder (23) is transferred to the surface of the buffer layer transfer cylinder (24).

[0143] Then, when the back surface of the base paper of the second intermediate product meets the buffer layer transfer cylinder (24), the buffer layer solution adheres to the inner primer layer of the second intermediate product to form an air discharge buffer layer (150), and in this state, it passes through the second drying tunnel (26) with a heater to be dried.

[0144] After that, the third intermediate product label, having an air discharge buffer layer (150) formed thereon, exits the second drying tunnel (26) and is wound onto the third rewinder roller (28).

[0145] As the third intermediate product (base paper (110) + outer primer layer (120) + inner primer layer (140) + air discharge buffer layer (150)) manufactured as in Fig. 7 is wound on the third rewinder roller (28), the third intermediate product is unwound and moves while being supported by the intermediate support roller.

[0146] Meanwhile, a third tank (32) containing a solution for forming an adhesive layer is provided, and a part of the adhesive layer coating cylinder (33) is placed in the third tank (32) and rotated so that the solution for forming an adhesive layer (160) is attached to the surface of the adhesive layer coating cylinder (33).

[0147] At this time, a third blade (37) is provided to control the thickness of the solution applied to the surface of the adhesive layer coating cylinder (33). Then, an adhesive layer transfer cylinder (34) is provided above the adhesive layer coating cylinder (33) and meets the adhesive layer coating cylinder (33), and the adhesive layer solution in the adhesive layer coating cylinder (33) is transferred to the surface of the adhesive layer transfer cylinder (34).

[0148] Then, when the back surface of the third intermediate product meets the adhesive layer transfer cylinder (34), the adhesive layer solution meets the air discharge buffer layer (150) of the third intermediate product to form an adhesive layer, and in this state, it passes through the third drying tunnel (36) with a heater to dry.

[0149] Afterward, the fourth intermediate product label with an adhesive layer formed thereon exits the third drying tunnel (36) and is wound onto the fourth rewinder roller (38). Subsequently, an outer primer layer (120) of the fourth intermediate product label is printed to form a printed layer (130). Additionally, a protective layer (not shown) may be provided on the printed layer (130). This protective layer protects the label surface from moisture or scratches by laminating a PP or PET film onto the printed layer (130). In particular, it can produce glossy and matte effects without additional printing processes, and can be specialized into a high-end label with high-quality features such as anti-counterfeiting effects by processing it into a film with an image such as a hologram. This protective layer has a thickness of 0.9 to 50 μm and has transparent, opaque, glossy, matte, or holographic colors. The form is a single film sheet with a back primer processed thereon, and the process of forming it on the printed (130) surface can be divided into two parts. That is, in the first method, a dedicated UV curing solution is applied to the surface of the processed and printed base paper, and a film sheet constituting the protective layer is adhered to it, and then a UV lamp is passed through to instantly cure and adhere the base paper and the protective layer film. In the second method, an adhesive is applied to the surface of the film sheet in advance (e.g., Scotch tape method) and the film sheet is attached to the printed layer (130) to produce it.

[0150] Printing can be done using a flexographic printing press, a rotary printing press, a digital printing press, an offset printing press, etc., and the label, once printed, can be cut into individual sheets using a post-processing machine to complete the production of a single finished label product.

[0151] For label printing, UV-curing ink is used in all models, adopting a method that dries under ultraviolet light simultaneously with printing without affecting the adhesive or primer layer.

[0152] The cylinder labeled as 1st in Fig. 12 is a cylinder (23) for coating a buffer layer, and the cylinder labeled as 2nd is a cylinder (33) for coating an adhesive layer.

[0153] On an intermediate product processed with an outer primer layer (120) and a back primer layer (140) coating on the base paper, a special cylinder is used to apply an additional bubble-preventing buffer layer (150) and an adhesive layer (160) coating.

[0154] Here, the cylinder is composed of metallic or non-metallic materials such as copper, ceramic, stainless steel, aluminum, and wrought iron.

[0155] A pattern is formed on the surface of the cylinder, and this pattern is to be transferred to the buffer layer (150) and the adhesive layer (160). The pattern is preferably one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern, but is not limited thereto.

[0156] The pattern on the cylinder surface is formed by engraving with the desired depth and size, for example, using a laser processing method. Depending on the depth and width of the pattern, a buffer layer solution or adhesive is transferred to the base paper, and the amount of application determines the adhesive strength.

[0157] FIG. 13 illustrates cylinders (22, 33) having various patterns.

[0158] FIG. 13(a) shows a hexagonal pattern similar to a honeycomb, FIG. 13(b) shows a straight comb pattern, FIG. 13(c) shows a diamond pattern, FIG. 13(d) shows an intersecting diagonal pattern, FIG. 13(e) shows a square grid pattern, and FIG. 13(f) shows a circular pattern, but the pattern shapes are not limited to these.

[0159] As shown in FIG. 12(a), a buffer layer for air discharge can be formed in the first stage using a cylinder (23) for coating a buffer layer with a hexagonal pattern, and an adhesive layer can be formed in the second stage using a cylinder (33) for coating an adhesive layer with a hexagonal pattern.

[0160] As shown in FIG. 12(b), in the first step, a buffer layer (150) for air discharge can be formed using a cylinder (23) for coating a buffer layer with an intersecting diagonal pattern, and in the second step, an adhesive layer (160) can be formed using a cylinder (33) for coating an adhesive layer with a hexagonal pattern.

[0161] As shown in FIG. 12(c), in the first step, a buffer layer (150) for air discharge can be formed using a cylinder (23) for coating a buffer layer with a diagonal intersecting pattern, and in the second step, an adhesive layer (160) can be formed using a cylinder (33) for coating an adhesive layer with a diagonal intersecting pattern.

[0162] In FIG. 10, reference numeral 24 and in FIG. 12, reference numeral 34 are rubber transfer cylinders (24, 34) that meet with a buffer layer coating cylinder (23) to receive a buffer layer solution formed along the pattern of the buffer layer coating cylinder (23), transfer it as is, and then transfer it to a second intermediate product to form an air discharge buffer layer (150), or meet with an adhesive layer coating cylinder (33) to receive an adhesive layer solution formed along the pattern of the adhesive layer coating cylinder (33), transfer it as is, and then transfer it to a third intermediate product to form an adhesive layer (160).

[0163] FIG. 14 is a flowchart of the manufacturing process of an in-mold label according to the first embodiment, summarizing the contents described above.

[0164] First, an external primer layer is coated on the surface of the base paper (S1401), and after drying, an internal primer layer is coated on the back side of the base paper (S1402). After drying, an air venting buffer layer coating with a pattern for air venting is applied (S1403), and after drying, an adhesive layer coating with a pattern for air venting is applied (S1404). After drying, a surface printing layer is formed on the external primer layer to complete the in-mold label (S1405).

[0165] Using FIGS. 15 to 17, a container including an in-mold label (100) according to the first embodiment of the present invention and a method for manufacturing the same will be described.

[0166] As illustrated in FIG. 15(a), after the in-mold label (100) according to the first embodiment is attached (attached by vacuum suction, etc.) inside the blowing mold (30) for forming the container (1), the container raw material (1a) (e.g., preform in the case of PET, parison in the case of PE) is placed inside the mold (30), and then air is injected to expand the container raw material (1a), so that it changes into the shape of the container (1) to fit the internal shape of the blowing mold (30).

[0167] In FIG. 15(b), an example drawing of a container with an in-mold label (100) attached is shown.

[0168] At this time, the surface temperature of the container raw material (1a) is about 95~110℃ in the case of a PET preform, and it takes 2~4 seconds for the molding to be completed and in-mold labeling to be done, and in the case of a PE parison, it is about 180~200℃ and it takes about 10~15 seconds for the molding to be completed and in-mold labeling to be done.

[0169] As shown in FIG. 16(a), before the container raw material (1a) is adhered to the in-mold label (100), there is an air discharge buffer layer (150) of the in-mold label (100) and a pattern of the adhesive layer (160).

[0170] As shown in FIG. 16(b), when the expanding container raw material (1a) adheres to the in-mold label (100), the adhesive layer (160) and the air discharge buffer layer (150) are melted by the high heat. In particular, the air discharge buffer layer (150) acts as a buffer and, as it contracts, guides the discharge of air to the outside of the label, thereby preventing the formation of internal bubbles or wrinkles, and ultimately decomposes and disappears or is absorbed into an adjacent layer. At this time, the pattern of the adhesive layer (160) also disappears or is absorbed into an adjacent layer, thereby discharging air. However, only the pattern of the adhesive layer (160) disappears or is absorbed into an adjacent layer, and as it is leveled and flattened, it fuses to the container surface and the internal primer layer (140).

[0171] Accordingly, when the air discharge buffer layer (150) is decomposed, disappears, or absorbed into an adjacent layer, the melted adhesive layer (160) is fused not only to the surface of the container (1) but also to the inner primer layer (140), at which time the fusion strength with the inner primer layer (140) becomes higher than the fusion strength with the container (1).

[0172] Therefore, when the label (100) is subsequently removed from the container (1) as shown in FIG. 3, the fusion strength between the inner primer () and the adhesive layer is higher, so the adhesive layer (160) can be easily separated from the container, and accordingly, the label (100) can be easily removed from the container (easy peel function).

[0173] FIG. 17 is a flowchart of the manufacturing process of a container (1) having an in-mold label (100) according to the first embodiment.

[0174] First, the blowing mold is separated, and an in-mold label is attached to the inner surface (S1701).

[0175] Then, the mold is pressed together, and the container material (1a) is placed inside the mold (30) (S1702), and then air is injected to expand the container material (S1703).

[0176] The container material expands to take on the shape of the container and adheres to the label. At this time, the adhesive layer melts and adheres to the container, while the air-releasing buffer layer shrinks and decomposes or is absorbed into an adjacent layer, thereby releasing air inside the label to prevent the formation of bubbles or wrinkles (S1704).

[0177] In this process, the adhesive layer is fused to the internal primer, and as described above, the fusion strength becomes higher than the fusion strength with the container surface.

[0178] After a certain amount of time, the in-mold label container is completed (S1705), and then the mold is separated and the container is removed (S1706).

[0180] FIG. 18 shows the layers of an in-mold label (200) according to a second embodiment of the present invention separated. The in-mold label (200) according to the second embodiment includes a base paper (210) in the middle and an outer primer layer (220) coated on one side of the base paper (210). Subsequently, a surface printing layer (230) on which letters or shapes are printed is provided on the outer primer layer (220), and it is preferable that this be printed after the in-mold label (200) is finally completed.

[0181] On the opposite side where the outer primer layer (220) is formed, an inner primer layer (240) coated on one side of the base paper and an adhesive layer (260) coated on the inner primer layer (240) are provided.

[0182] The difference from the first embodiment is that there is no buffer layer for air discharge, and the adhesive layer (260) performs that role.

[0183] Here, the primer layer serves to firmly hold and fix a specific layer connected to the primer layer. The material and properties of the primer layer are the same as those mentioned in the first embodiment.

[0184] A pattern is formed on the adhesive layer (260), and this pattern guides the air to escape when a label is attached to a container following blow molding, thereby suppressing the occurrence of bubbles or wrinkles caused by residual air.

[0185] The properties and characteristics of the original paper (210) are also the same as those of the first embodiment.

[0186] Using FIGS. 19 to 25, the structure of an in-mold label according to the second embodiment, a method for manufacturing an in-mold label, an apparatus for manufacturing an in-mold label, a container with an in-mold label attached, and a method for manufacturing the container will be described.

[0187] As illustrated in FIG. 19, an outer primer layer (220) is coated on one side (outer surface) of the base paper. The outer primer layer (220) is a coating layer for fixing printing ink, and the coating amount is approximately 3 to 5 μm. However, the range is not limited to this.

[0188] As illustrated in FIG. 20, after the structure of the base paper (210) + outer primer layer (220) made in FIG. 5 is completed, an adhesive layer (260) is coated on the other side (inner surface) of the base paper.

[0189] As described above in the first example, the adhesive layer (260) is a layer that allows a label to be attached to the surface of a container at high temperature.

[0190] A pattern is formed on the adhesive layer (260), and this pattern includes a space portion (261) and a partition portion (262) and has a three-dimensional structure.

[0191] The pattern is characterized by being at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern.

[0192] The coating amount is approximately 12 to 15 μm. However, the range is not limited to this.

[0193] Here, the space portion (261) may be positioned toward the inner primer layer (240) as shown in FIG. 20(a), and may also be positioned toward the opposite side (outer surface, container surface direction) as shown in FIG. 20(b).

[0194] The device for producing the in-mold label (200) of the second embodiment includes the device of FIG. 9 (internal primer layer coating device) and the device of FIG. 11 (adhesive layer coating device), and since their structure and description are identical, they are omitted to avoid redundant description.

[0195] The cylinder (33) of FIG. 21 is a cylinder for coating an adhesive layer to produce an in-mold label according to the second embodiment.

[0196] The description of the cylinder (33) for the adhesive layer coating here is the same as that described above in FIGS. 13 and FIGS. 14, so it will be omitted to avoid redundancy.

[0197] FIG. 22 is a flowchart of the manufacturing process of an in-mold label according to the second embodiment, summarizing the contents described above.

[0198] First, an external primer layer is coated on the surface of the base paper (S2201), and after drying, an internal primer layer is coated on the back side of the base paper (S2202). After drying, an adhesive layer coating with a pattern formed for air evacuation is applied (S2203). After drying, a printed layer is formed on the external primer layer to complete the in-mold label (S2204).

[0199] A container including an in-mold label according to a second embodiment of the present invention and a method for manufacturing the same are described using FIGS. 23 to 26.

[0200] As illustrated in FIG. 23(a), after attaching an in-mold label (200) to the inside of a blowing mold (30) for forming a container (vacuum adsorption method, etc.), and then placing a container raw material (1a) (e.g., a preform in the case of PET, a parison in the case of PE) into the inside of the mold (30), and then injecting air to expand the container raw material (1a), it changes into a container shape that fits the internal shape of the blowing mold (30).

[0201] FIG. 23(b) shows an example drawing of a container (1) with an in-mold label (200) attached according to the second embodiment.

[0202] Even at this time, the surface temperature of the container raw material (1a) is about 95~110℃ in the case of PET preform, and it takes 2~4 seconds for molding to be completed and in-mold labeling to be done, and in the case of PE parison, it is about 180~200℃ and it takes about 10~15 seconds for molding to be completed and in-mold labeling to be done.

[0203] As shown in FIGS. 24(a) and FIGS. 25(a), before the container raw material (1a) is adhered to the in-mold label (200), there is a pattern of the adhesive layer (260) of the in-mold label (200).

[0204] As shown in FIGS. 24(a) and FIGS. 25(a), when the expanding container material (1a) adheres to the in-mold label (200), the adhesive layer (260) is melted by the hot heat, and the pattern of the adhesive layer (260) is also destroyed or absorbed into an adjacent layer and leveled, but the air is discharged during the shrinkage and leveling process of the pattern.

[0205] Accordingly, when the pattern disappears or is absorbed into an adjacent layer and leveled, the melted adhesive layer (260) is already attached to the inner primer layer (240) as well as the surface of the container (1), and at this time, the adhesion strength with the inner primer layer (240) becomes higher than the fusion strength with the container.

[0206] Therefore, when the label (200) is subsequently removed from the container (1) as shown in FIG. 3, the fusion strength between the inner primer layer (240) and the adhesive layer (260) is higher, so the adhesive layer (260) can be easily separated from the container (1), and accordingly, the label (200) can be easily removed from the container (easy peel function).

[0207] FIG. 26 is a flowchart of the manufacturing process of a container (1) having an in-mold label (200) according to the first embodiment.

[0208] First, the blowing mold is separated, and an in-mold label is attached to the inner surface (S2601).

[0209] Then, the mold is pressed together, and the container material is placed inside the mold (S2602), and then air is injected to expand the material (S2603).

[0210] As the container material expands to take on the shape of the container, the label adheres to it. At this time, the adhesive layer melts and adheres to the container, while the pattern of the adhesive layer shrinks, disappears, or is absorbed into an adjacent layer, thereby guiding the release of air inside the label during the shrinkage process to prevent the formation of bubbles or wrinkles. During this process, the adhesive layer fuses further while attached to the internal primer, and as described above, the fusion strength becomes higher than the fusion strength with the container surface (S2604).

[0211] After a certain amount of time, the in-mold label container is completed (S2605), and then the mold is separated and the container is removed (S2606).

[0212] FIGS. 27 and 28 illustrate a label removal printing layer (101, 202) placed on the edge (or corner) of an in-mold label (100, 200) according to the first and second embodiments mentioned above. The label removal printing layer (101, 202) is printed on a part of the adhesive layer (160, 260) so that the part does not adhere to the container during the in-mold process, and is provided so that when removing the label when disposing of or recycling the container later, the user can easily remove the label (100, 200) from the container (1) by holding the label removal printing layer (101, 202).

[0213] FIG. 29 (a1, a2) shows the outer surface of the in-mold label, and FIG. 29 (b1, b2) shows the inner surface of the in-mold label.

[0214] The difference from the previously described in-mold label is that a back printing layer (180, 280) is formed on the back (inner surface) of the in-mold label. The back printing layer (180, 280) is printed on the inner adhesive layer (160, 260), and the white background shown in FIG. 29 (b1, b2) is the inner adhesive layer (160, 260), and the letters or shapes are the back printing layer (180, 280).

[0215] In this way, by introducing a back printing layer (180, 280), when an in-mold label is used in a transparent or translucent container as in FIG. 30, the surface printing layer (130, 230) is visible on the front side of the container as in 30(a), and the back printing layer (180, 280) is visually visible on the back side of the container as in 30(b), thereby providing more diverse information and visual images, which can increase the added value of the label and the added value of the container in which the label is used.

[0216] FIG. 31 is a side cross-sectional view in addition to the first embodiment, showing a state in which a label removal printing layer (170) is printed on a corner or edge of an adhesive layer (160) and a back printing layer (180) is printed on a part of the surface of an adhesive layer (160). The remaining structure is the same as that of the first embodiment, so the description is omitted.

[0217] The remaining adhesive layer (160) that is not printed with the label removal printing layer (170) or the back printing layer (180) is melted during the in-mold labeling process and attached to the container (1).

[0218] Here, the printing layer for label removal (170) is preferably a printing layer made of a transparent material, and the back printing layer (180) is preferably a printing layer having visible characteristics such that a picture, photograph, image, text, or number can be visually seen.

[0219] FIG. 32 is a flowchart of a manufacturing process for an in-mold label including a back printing layer (180) and a label removal printing layer (170), which is a modified example of the first embodiment summarizing the above-described content.

[0220] First, an external primer layer is coated on the surface of the base paper (S3201), and after drying, an internal primer layer is coated on the back side of the base paper (S3202). After drying, an air venting buffer layer coating with a pattern for air venting is coated (S3203), and after drying, an adhesive layer coating with a pattern for air venting is coated (S3204).

[0221] After drying, a back printing layer and / or a printing layer for label removal is formed on the adhesive layer (S3205), and after drying, a surface printing layer is formed on the outer primer layer to complete the in-mold label (S3206).

[0222] Printing can be done using a flexographic printing press, a rotary printing press, a digital printing press, an offset printing press, etc., and the label, once printed, can be cut into individual sheets using a post-processing machine to complete the production of a single finished label product.

[0223] For label printing, UV-curing ink is used in all models, adopting a method that dries under ultraviolet light simultaneously with printing without affecting the adhesive or primer layer.

[0224] FIG. 33 is a side cross-sectional view in addition to the second embodiment, showing a state in which a label removal printing layer (270) is printed on a corner or edge of an adhesive layer (260) and a back printing layer (280) is printed on a part of the surface of an adhesive layer (260). The remaining structure is the same as that of the second embodiment, so the description is omitted.

[0225] FIG. 34 is a flowchart of the manufacturing process of an in-mold label according to the second embodiment, summarizing the contents described above.

[0226] First, an external primer layer is coated on the surface of the base paper (S3401), and after drying, an internal primer layer is coated on the back side of the base paper (S3402). After drying, an adhesive layer coating with a pattern for air evacuation is applied (S3403). After drying, a back printing layer and / or a label removal printing layer is formed on the adhesive layer (S3404), and after drying, a surface printing layer is formed on the external primer layer to complete the in-mold label (S3405).

[0227] FIGS. 35 and 36 are enlarged side views of an in-mold label container to which a modified example of the first embodiment and a modified example of the second embodiment are applied, FIG. 37(a) illustrates the process of manufacturing the in-mold label container in a mold, FIG. 37(b) illustrates the surface printing layer (130, 230) being visible from the front of the container, and FIG. 37(c) illustrates the back printing layer (180, 280) being visible from the back of the container.

[0228] The manufacturing process of the container and the structure of the label are identical to those of the first and second embodiments above, except that the label removal printing layer (170, 270) is printed on the corner or edge of the adhesive layer (160, 260) and the back printing layer (180, 280) is printed on a part of the surface of the adhesive layer (160, 260). Therefore, a detailed explanation regarding this is omitted to avoid redundant explanation.

[0229] Although the present invention has been described above with reference to the embodiments illustrated in the drawings, this is merely for the purpose of explaining the invention, and those skilled in the art will understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0230] Therefore, the true scope of rights of the present invention must be determined by the technical concept of the patent claims. Explanation of the symbols

[0231] 1: Container 23, 33: Cylinder 100, 200: In-mold label 110: Wonji 120, 220: External primer 130, 230: Surface printed layer 140, 240: Internal primer 150: Buffer layer for air exhaust 160, 260: Adhesive layer 170, 270: Printed layer for label removal 180, 280: Back printing layer

Claims

Claim 1 An in-mold label comprising: a base paper for the label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer; and an adhesive layer coated on the air venting buffer layer, wherein the air venting buffer layer comprises a space portion and a partition portion formed between the space portions, and has elasticity to mitigate impact during the in-mold labeling process, and wherein the space portion and the partition portion are composed of a repeating pattern, and wherein the air venting buffer layer is heated in a temperature range of 90°C to 200°C when in contact with the surface of the raw material of a container during the in-mold labeling process, shrinks, disappears, or is absorbed into an adjacent layer, thereby guiding air to escape to the outside of the label, and wherein after the air venting buffer layer disappears or is absorbed into an adjacent layer, the primer layer and the adhesive layer are in close contact so that the primer layer fixes the adhesive layer. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 A method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an air-releasing buffer layer on the primer layer; and coating an adhesive layer on the air-releasing buffer layer, wherein the step of coating the air-releasing buffer layer on the primer layer is a step of forming an air-releasing buffer layer including a space portion and a partition portion by transferring a pattern formed on the surface of a buffer layer coating cylinder or a buffer layer transfer cylinder to the primer layer, and the step of coating the adhesive layer on the air-releasing buffer layer is a step of forming an adhesive layer by transferring a pattern formed on the surface of an adhesive layer coating cylinder or an adhesive layer transfer cylinder to the air-releasing buffer layer, and wherein the air-releasing buffer layer is formed such that when the manufactured in-mold label is heated to a temperature range of 90°C to 200°C during the in-mold labeling process, it shrinks, disappears, or is absorbed into an adjacent layer, thereby guiding air to be discharged to the outside of the label, and subsequently, the primer layer and the adhesive layer adhere to each other. Claim 7 delete Claim 8 delete Claim 9 An in-mold label comprising: a base paper for the label; a primer layer coated on the surface of the base paper; and an adhesive layer including a pattern forming an air exhaust passage, wherein the air exhaust passage is formed to face the primer layer or is formed in an area opposite the primer layer that can face the surface of the container, and the pattern forming the air exhaust passage is heated in a temperature range of 90°C to 200°C when in contact with the surface of the raw material of the container during the in-mold labeling process, shrinks, disappears, or is absorbed into an adjacent layer, thereby guiding air to be exhausted to the outside of the label, and the adhesive layer is configured to be leveled after the pattern forming the air exhaust passage disappears or is absorbed into an adjacent layer, so as to adhere to the primer layer and the surface of the container. Claim 10 delete Claim 11 delete Claim 12 delete Claim 13 delete Claim 14 A method for manufacturing an in-mold label, comprising the steps of: coating a primer layer on a base paper; and coating an adhesive layer on the primer layer, the step of coating the adhesive layer is implemented by transferring a pattern formed on the surface of an adhesive layer coating cylinder or an adhesive layer transfer cylinder to the primer layer, wherein the pattern forming the air exhaust passage is formed on the adhesive layer, and when the manufactured in-mold label comes into contact with the surface of the raw material of a container during the in-mold labeling process, it is heated in a temperature range of 90°C to 200°C to shrink, disappear, or be absorbed into an adjacent layer, thereby guiding the discharge of air to the outside of the label, and wherein the adhesive layer is formed to be leveled after the pattern disappears or is absorbed into an adjacent layer, so as to adhere to the primer layer and the surface of the container. Claim 15 delete Claim 16 An apparatus for manufacturing an in-mold label, comprising: a buffer layer cylinder for coating an air-releasing buffer layer onto a primer layer coated on a base paper; and an adhesive layer cylinder for coating an adhesive layer onto the air-releasing buffer layer, wherein at least one of the buffer layer cylinder or the adhesive layer cylinder has a pattern formed for transferring an air-releasing pattern, a buffer layer transfer cylinder is provided opposite the buffer layer cylinder to transfer a buffer layer solution formed along the pattern of the buffer layer cylinder to the primer layer, and an adhesive layer transfer cylinder is provided opposite the adhesive layer cylinder to transfer an adhesive layer solution formed along the pattern of the adhesive layer cylinder to the air-releasing buffer layer, wherein the pattern formed on the buffer layer cylinder or the adhesive layer cylinder is at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern, and the air-releasing buffer layer is formed to shrink and disappear or be absorbed into an adjacent layer during the in-mold labeling process of the manufactured in-mold label. Claim 17 An apparatus for manufacturing an in-mold label, comprising an adhesive layer cylinder for coating an adhesive layer onto a primer layer coated on a base paper, wherein the adhesive layer has a pattern formed therein that serves as an air discharge passage for discharging air and preventing the formation of bubbles during the in-mold labeling process, wherein the adhesive layer cylinder has a pattern formed therein for transferring the air discharge pattern, wherein an adhesive layer transfer cylinder is provided opposite to the adhesive layer cylinder to transfer an adhesive layer solution formed along the pattern of the adhesive layer cylinder to the primer layer, wherein the pattern formed on the adhesive layer cylinder is at least one of a hexagonal pattern, a grid pattern, a straight pattern, a diamond pattern, a square pattern, or a circular pattern, and wherein the pattern of the air discharge passage formed on the adhesive layer is formed such that it shrinks, disappears, or is absorbed into an adjacent layer to level when heated to a temperature range of 90°C to 200°C during the in-mold labeling process of the manufactured in-mold label. Claim 18 delete Claim 19 The invention comprises a container and an in-mold label attached to the surface of the container, wherein the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer, which exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the completion of container manufacturing; and an adhesive layer that is coated on the air venting buffer layer during the container manufacturing process and is located on the primer layer after the completion of container manufacturing, wherein the air venting buffer layer is formed in a repeating pattern including a space portion and a partition portion between said space portions, and guides the air inside the label to be vented to the outside of the label as it shrinks during the container manufacturing process, and at least one of the air venting buffer layer or the adhesive layer has a pattern formed therein that exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the completion of container manufacturing, and guides air venting and prevents the formation of bubbles or wrinkles, and after the air venting buffer layer disappears or is absorbed into an adjacent layer, the adhesive layer is fused to the surface of the container and the primer layer, and the fusion strength between the adhesive layer and the primer layer is greater than the fusion strength between the adhesive layer and the surface of the container A container having an in-mold label characterized by being formed large. Claim 20 delete Claim 21 A container comprising a container and an in-mold label attached to the surface of the container, wherein the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; and an adhesive layer coated on the primer layer, wherein the adhesive layer is provided with a pattern that exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed to release air and prevent the generation of bubbles, and wherein the pattern forming the air release passage is formed in an area facing the primer layer or facing the container surface, and wherein the pattern of the adhesive layer is heated in a temperature range of 90°C to 200°C when in contact with the surface of the container material during the container manufacturing process, shrinks, disappears, or is absorbed into an adjacent layer to level, and wherein the adhesive layer is fused to the container surface and the primer layer after the pattern is leveled, and wherein the fusion strength between the adhesive layer and the primer layer is formed to be greater than the fusion strength between the adhesive layer and the container surface. Claim 22 delete Claim 23 The method comprises the steps of: attaching a label to a separated mold; pressing the mold and placing the raw material of the container inside the mold; injecting air to expand the raw material; allowing the air-releasing buffer layer inside the label to contract and disappear or be absorbed into an adjacent layer as the container raw material adheres to the label, thereby allowing the air inside the label to be released to prevent the formation of bubbles or wrinkles; and separating the mold and removing the container after the in-mold label container is completed, wherein, in the step where the container raw material adheres to the label, the air-releasing buffer layer is heated in a temperature range of 90°C to 200°C to contract and possesses elasticity to act as a buffer, cushion, or cushioning material that alleviates shock during the in-mold labeling process, the air inside the label is released to the outside of the label during the contraction process of the air-releasing buffer layer, and after the air-releasing buffer layer disappears or is absorbed into an adjacent layer, the adhesive layer is fused to the primer layer, and the fusion strength between the adhesive layer and the primer layer is formed to be greater than the fusion strength between the adhesive layer and the container surface. Method of manufacturing a container. Claim 24 A method for manufacturing a container having an in-mold label, comprising the steps of: attaching a label to a separated mold; pressing the mold and placing the container raw material inside the mold; injecting air to expand the raw material; ensuring that as the container raw material adheres to the label, an air discharge passage formed in the adhesive layer inside the label disappears or is absorbed into an adjacent layer, thereby allowing air inside the label to be discharged to prevent the formation of bubbles or wrinkles; and separating the mold and removing the container after the in-mold label container is completed, wherein, in the step where the container raw material adheres to the label, the pattern of the air discharge passage formed in the adhesive layer is heated in a temperature range of 90°C to 200°C to shrink, disappear, or be absorbed into an adjacent layer to level, and the adhesive layer is fused to a primer layer and the container surface after the pattern of the air discharge passage is leveled, and the fusion strength between the adhesive layer and the primer layer is formed to be greater than the fusion strength between the adhesive layer and the container surface. Claim 25 An in-mold label comprising: a base paper for the label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer; an adhesive layer coated on the air venting buffer layer; and a back printing layer printed on the adhesive layer, wherein the air venting buffer layer is formed in a repeating pattern including a space portion and a partition portion between the space portions, and has elasticity to act as a buffer, cushion, or cushioning material that alleviates shock during the in-mold labeling process, and when it comes into contact with the surface of the raw material of a container during the in-mold labeling process, it is heated in a temperature range of 90°C to 200°C to shrink, disappear, or is absorbed into an adjacent layer, thereby guiding air to be vented to the outside of the label and preventing the occurrence of bubbles or wrinkles inside the label, and wherein the back printing layer is formed only on a portion of the area of ​​the adhesive layer, and the adhesive layer is exposed in the remaining portion excluding the back printing layer. Claim 26 delete Claim 27 delete Claim 28 delete Claim 29 An in-mold label comprising: a base paper for the label; a primer layer coated on the surface of the base paper; an adhesive layer coated on the primer layer; and a back printing layer printed on the adhesive layer, wherein a pattern constituting an air discharge passage is formed in the adhesive layer, and the pattern is heated in a temperature range of 90°C to 200°C when in contact with the surface of the raw material of the container during the in-mold labeling process, shrinks, disappears, or is absorbed into an adjacent layer to level, and the back printing layer is formed only on a portion of the area of ​​the adhesive layer, and the adhesive layer is exposed in the remaining portion excluding the back printing layer. Claim 30 delete Claim 31 delete Claim 32 An in-mold label according to claim 25 or 29, further comprising a label separation printing layer printed on the border or corner of the adhesive layer. Claim 33 A method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an air-releasing buffer layer on the primer layer; coating an adhesive layer on the air-releasing buffer layer; and forming a back-printed layer on a portion of the adhesive layer, wherein the step of coating the air-releasing buffer layer on the primer layer is implemented by transferring a pattern formed on the surface of a buffer layer coating cylinder or a buffer layer transfer cylinder to the primer layer, the step of coating the adhesive layer on the air-releasing buffer layer is implemented by transferring a pattern formed on the surface of a adhesive layer coating cylinder or an adhesive layer transfer cylinder to the air-releasing buffer layer, and wherein, in the step of forming a back-printed layer on the adhesive layer, the back-printed layer is formed over a portion of the adhesive layer area, and the adhesive layer is exposed in the remaining portion excluding the back-printed layer. Claim 34 delete Claim 35 delete Claim 36 delete Claim 37 A method for manufacturing an in-mold label comprising the steps of: coating a primer layer on a base paper; coating an adhesive layer on the primer layer; and forming a back-printed layer on a portion of the adhesive layer, wherein the step of coating the adhesive layer on the primer layer is implemented by transferring a pattern formed on the surface of an adhesive layer coating cylinder or an adhesive layer transfer cylinder to the primer layer, and a pattern constituting an air discharge passage is formed on the adhesive layer, and the step of forming a back-printed layer on the adhesive layer is implemented for a portion of the adhesive layer area, and the remaining portion excluding the back-printed layer is characterized by the adhesive layer being exposed. Claim 38 delete Claim 39 delete Claim 40 A container comprising a container and an in-mold label attached to the surface of the container, wherein the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; an air venting buffer layer coated on the primer layer, which exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed; an adhesive layer that is coated on the air venting buffer layer during the container manufacturing process and is located on the primer layer after the container manufacturing is completed; and a back printing layer printed on a portion of the area of ​​the adhesive layer, wherein the air venting buffer layer guides the release of air inside the label to the outside as it shrinks during the container manufacturing process, and disappears or is absorbed into an adjacent layer after the container manufacturing is completed, thereby causing the primer layer and the adhesive layer to adhere to each other, wherein the back printing layer is composed of a visible image or text, and the remaining adhesive layer excluding the back printing layer is attached to the surface of the container. Claim 41 A container comprising a container and an in-mold label attached to the surface of the container, wherein the in-mold label comprises: a base paper for the label; a primer layer coated on the surface of the base paper; an adhesive layer coated on the primer layer; and a back printing layer printed on a portion of the area of ​​the adhesive layer, wherein the adhesive layer is provided with a pattern that exists during the container manufacturing process and disappears or is absorbed into an adjacent layer after the container manufacturing is completed to release air and prevent the generation of bubbles, and wherein the back printing layer is composed of a visible image or text, and the remaining adhesive layer excluding the back printing layer is attached to the surface of the container. Claim 42 delete Claim 43 delete Claim 44 A container having an in-mold label, characterized in that, in claim 40 or 41, it includes a label removal printing layer printed on the corner or edge of the adhesive layer to prevent the adhesive layer from adhering to the surface of the container and to provide a space to be grasped when removing the label.

Images