A temperature-sensitive color-changing tape for encapsulation

Abstract

This invention provides a thermochromic tape for packaging. The thermochromic tape is a long strip, comprising a substrate layer, a color-changing adhesive layer, and a release film layer stacked sequentially; the color-changing adhesive layer is a thermochromic adhesive layer. This invention, by mixing water-based adhesive and thermochromic materials to form a color-changing adhesive layer with color-changing function and excellent adhesion, can indicate changes in ambient temperature during the packaging and transportation of the packaged product; simultaneously, the tape's stickiness decreases after color change, making it easy to peel off without detachment.

Description

Technical Field

[0001] This utility model belongs to the field of tape technology, and in particular relates to a thermosensitive color-changing tape for packaging. Background Technology

[0002] Temperature-sensitive tape, also known as temperature-sensitive stickers or color-changing tape, can change color according to temperature changes and can be used in electronic component manufacturing, container packaging, and other fields.

[0003] In the field of electronic component manufacturing, thermochromic tape is widely used in high-precision positioning, cutting, and grinding processes for components such as resistors, inductors, capacitors, and chips due to its unique properties. Made with a special adhesive, thermochromic tape maintains stable adhesion at room temperature, reliably securing electronic components. When a set temperature is reached, the tape changes color, visually indicating the temperature process. Simultaneously, the adhesive force quickly disappears, achieving easy peeling, leaving no residue, and preventing contamination of the adhered object. It also possesses anti-counterfeiting and easy identification functions, effectively improving the automation level of electronic component production, significantly saving manpower and material resources, greatly increasing production efficiency, and reducing production costs.

[0004] In the field of container packaging, thermochromic tape can be applied to water cups. When the water cup is hot, the tape changes color to alert the user. When packaging cardboard boxes, if the product inside the box is fruit, poor ventilation inside the box and excessively high ambient temperature will accelerate the spoilage of the fruit. In such cases, thermochromic tape can be used to identify the temperature.

[0005] However, existing thermochromic tapes typically separate the color-changing layer and the adhesive layer in their structural design. For example, CN 219689631U discloses a thermochromic tape comprising a base layer and a temperature-sensitive coating; the base layer includes opposing inner and outer surfaces, the temperature-sensitive coating is disposed on the outer surface of the base layer, and the inner surface of the base layer has an adhesive area. This structural design leads to a complex manufacturing process, requiring multiple steps such as preparation, coating, and assembly of the color-changing layer and the adhesive layer. This not only increases the time and labor costs in the production process but also makes quality control more difficult due to the numerous process steps, easily leading to unstable quality and further increasing the product defect rate. Ultimately, this results in high overall production costs, making it difficult to meet the needs of the electronic component manufacturing industry for efficient and low-cost production. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a thermochromic adhesive tape for packaging. This invention mixes a water-based adhesive with a thermochromic material to form a color-changing adhesive layer with both color-changing function and excellent adhesion. This allows the tape to indicate changes in ambient temperature during the packaging and transportation of the packaged product. Simultaneously, the tape's adhesiveness decreases after color change, making it easy to peel off and preventing delamination.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This utility model provides a thermosensitive color-changing tape for packaging. The thermosensitive color-changing tape is a long strip and includes a substrate layer, a color-changing adhesive layer and a release film layer stacked in sequence.

[0009] The color-changing adhesive layer is a thermochromic adhesive layer.

[0010] The color-changing adhesive layer described in this invention is a thermochromic adhesive layer, which contains a thermochromic material, specifically formed by mixing a water-based adhesive and a thermochromic material. This gives the color-changing adhesive layer a color-changing function and excellent adhesion performance, enabling it to indicate changes in ambient temperature during the packaging and transportation of the packaged product. Furthermore, after the color-changing adhesive layer changes color, it reacts to release a de-adhesive substance, reducing the adhesiveness of the tape. Therefore, the tape is easy to peel off and does not detach.

[0011] In addition, the preparation process of the thermochromic tape of this utility model is as follows: the color-changing adhesive layer is coated onto the substrate layer in one step, and then a release film layer is covered to form the thermochromic tape. This preparation process is simple and environmentally friendly.

[0012] The water-based adhesive includes any one or a combination of at least two of the following: polyvinyl alcohol water-based adhesives, ethylene acetate water-based adhesives, acrylic water-based adhesives, polyurethane water-based adhesives, epoxy water-based adhesives, phenolic water-based adhesives, silicone water-based adhesives, or rubber water-based adhesives. Typical but non-limiting combinations include: a combination of polyvinyl alcohol water-based adhesives and ethylene acetate water-based adhesives, a combination of epoxy water-based adhesives, phenolic water-based adhesives, and rubber water-based adhesives, or a combination of acrylic water-based adhesives, polyurethane water-based adhesives, and silicone water-based adhesives.

[0013] The thermochromic material includes color-changing ink or temperature-sensitive color-changing powder; the present invention does not limit the specific materials used for the thermochromic material, as long as they meet the specified temperature range and the color-changing requirements.

[0014] Preferably, the substrate layer is a transparent structure.

[0015] Preferably, the substrate layer includes any one of a transparent PET layer, a transparent PP layer, or a transparent PVC layer.

[0016] Preferably, the thickness of the substrate layer is 20 to 50 μm, for example, it can be 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited to the listed values. Other values ​​not listed within the range are also applicable.

[0017] Preferably, the thickness of the color-changing adhesive layer is 15 to 40 μm, for example, it can be 15 μm, 20 μm, 25 μm, 30 μm, 35 μm or 40 μm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0018] The thickness of the color-changing adhesive layer described in this invention is 15-40 μm. If the thickness is too thick or too thin, the adhesive ability of the color-changing adhesive layer will be reduced, thereby affecting the encapsulation effect.

[0019] Preferably, in the direction perpendicular to the substrate layer, the color-changing adhesive layer includes at least two color-changing adhesive strips arranged in parallel.

[0020] Preferably, the color-changing adhesive strips are all different colors.

[0021] Preferably, the mass ratio of water-based adhesive to thermochromic material in each color-changing adhesive strip is 10:0.5 to 0.8, for example, it can be 10:0.5, 10:0.55, 10:0.6, 10:0.65, 10:0.7, 10:0.75 or 10:0.8, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] It is worth noting that the color-changing adhesive strips are all transparent at room temperature. When the ambient temperature changes, each color-changing adhesive strip will display a different color depending on the thermochromic material mixed in it.

[0023] Preferably, the color-changing adhesive strip includes a low-temperature color-changing adhesive strip, a medium-temperature color-changing adhesive strip, and a high-temperature color-changing adhesive strip arranged in parallel.

[0024] Preferably, the temperature range at which the low-temperature color-changing adhesive strip changes from transparent to colored is 60 to 80°C, for example, 60°C, 64°C, 68°C, 72°C, 76°C, or 80°C, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] Preferably, the temperature range at which the medium-temperature color-changing adhesive strip changes from transparent to colored is 80 to 100°C, for example, 80°C, 84°C, 88°C, 92°C, 96°C, or 100°C, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0026] Preferably, the temperature range at which the high-temperature color-changing adhesive strip changes from transparent to colored is 100 to 120°C, for example, 100°C, 104°C, 108°C, 112°C, 116°C, or 120°C, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0027] It is worth noting that this utility model uses temperature-sensitive color-changing tape to seal items, allowing the ambient temperature of the item to be sealed to be determined directly by observing the color of the tape. Furthermore, by using color-changing strips with different colors and temperature-changing conditions, this utility model can more sensitively determine temperature changes, making it more suitable for sealing temperature-sensitive items.

[0028] Preferably, the thickness of the release film layer is 25 to 30 μm, for example, it can be 25 μm, 26 μm, 27 μm, 28 μm, 29 μm or 30 μm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] It is worth noting that when the thermochromic tape described in this utility model is used to seal items, the color of the color-changing adhesive layer in the thermochromic tape is significantly different from the color of the item to be sealed, so as to facilitate the observation of color changes.

[0030] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the numerical range not listed above. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0031] The system refers to an equipment system, device system, or production device.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The color-changing adhesive layer provided by this utility model has both color-changing function and excellent adhesive performance. The thermo-color-changing tape containing the color-changing adhesive layer has a simple structure, a simple preparation process, and broad development prospects.

[0034] (2) The thermochromic tape provided by this utility model has excellent adhesive properties at room temperature. After the color changes, the adhesiveness decreases, making it easy to peel off and preventing delamination.

[0035] (3) The color-changing adhesive layer provided by this utility model has a color-changing adhesive strip that changes color at different temperatures, which can achieve more agile and accurate feedback of the ambient temperature of the item to be packaged, so as to ensure the quality of the item to be packaged. Attached Figure Description

[0036] Figure 1This is a cross-sectional view of the thermosensitive color-changing tape for encapsulation provided in Embodiment 1 of this utility model;

[0037] Figure 2 This is a top view of the color-changing adhesive layer provided in Embodiment 1 of this utility model;

[0038] Among them, 1 is the substrate layer, 2 is the color-changing adhesive layer, 3 is the release film layer, 2-1 is the low-temperature color-changing adhesive strip, 2-2 is the medium-temperature color-changing adhesive strip, and 2-3 is the high-temperature color-changing adhesive strip. Detailed Implementation

[0039] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] This embodiment provides a thermochromic tape for encapsulation, such as... Figure 1 As shown, the thermochromic tape is a long strip and includes a substrate layer 1, a color-changing adhesive layer 2, and a release film layer 3 stacked in sequence; the color-changing adhesive layer 2 is a thermochromic adhesive layer.

[0044] The substrate layer 1 is a transparent structure, the substrate layer 1 is a transparent PET layer, and the thickness of the substrate layer is 35μm;

[0045] like Figure 2 As shown, the thickness of the color-changing adhesive layer 2 is 25μm. In the direction perpendicular to the substrate layer 1, the color-changing adhesive layer includes parallel low-temperature color-changing adhesive strips 2-1, medium-temperature color-changing adhesive strips 2-2, and high-temperature color-changing adhesive strips 2-3, each with a different color.

[0046] The thickness of the release film layer 3 is 28 μm.

[0047] Example 2

[0048] This embodiment provides a thermochromic tape for encapsulation, such as... Figure 1 As shown, the thermochromic tape is a long strip and includes a substrate layer 1, a color-changing adhesive layer 2, and a release film layer 3 stacked in sequence; the color-changing adhesive layer 2 is a thermochromic adhesive layer.

[0049] The substrate layer 1 is a transparent structure, the substrate layer 1 is a transparent PP layer, and the thickness of the substrate layer is 20μm; for example Figure 2 As shown, the thickness of the color-changing adhesive layer 2 is 15μm. In the direction perpendicular to the substrate layer 1, the color-changing adhesive layer 2 includes parallel low-temperature color-changing adhesive strips 2-1, medium-temperature color-changing adhesive strips 2-2 and high-temperature color-changing adhesive strips 2-3, each with a different color.

[0050] The thickness of the release film layer 3 is 25 μm.

[0051] Example 3

[0052] This embodiment provides a thermochromic tape for encapsulation, such as... Figure 1 As shown, the thermochromic tape is a long strip and includes a substrate layer 1, a color-changing adhesive layer 2, and a release film layer 3 stacked in sequence; the color-changing adhesive layer 2 is a thermochromic adhesive layer.

[0053] The substrate layer 1 is a transparent structure, the substrate layer is a transparent PVC layer, and the thickness of the substrate layer 1 is 50 μm; Figure 2 As shown, the thickness of the color-changing adhesive layer 2 is 40μm. In the direction perpendicular to the substrate layer 1, the color-changing adhesive layer 2 includes parallel low-temperature color-changing adhesive strips 2-1, medium-temperature color-changing adhesive strips 2-2 and high-temperature color-changing adhesive strips 2-3, each with a different color.

[0054] The thickness of the release film layer 3 is 30 μm.

[0055] Example 4

[0056] This embodiment provides a thermochromic tape for encapsulation, such as... Figure 1 As shown, the thermochromic tape is a long strip and includes a substrate layer 1, a color-changing adhesive layer 2, and a release film layer 3 stacked in sequence; the color-changing adhesive layer 2 is a thermochromic adhesive layer.

[0057] The substrate layer 1 is a transparent structure, the substrate layer 1 is a transparent PET layer, and the thickness of the substrate layer 1 is 30 μm; Figure 2 As shown, the thickness of the color-changing adhesive layer 2 is 20 μm.

[0058] The thickness of the release film layer 3 is 27 μm.

[0059] A comprehensive analysis of Examples 1-4 shows that this invention, by mixing water-based adhesive and thermochromic materials to form a color-changing adhesive layer with color-changing function and excellent adhesion, can provide indication of the specific temperature experience of the product to be packaged during the process; at the same time, the adhesiveness of the tape decreases after color change, making it easy to peel off and preventing delamination.

[0060] Example 5

[0061] This embodiment provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and that of Embodiment 1 is:

[0062] In this embodiment, the thickness of the substrate layer is adjusted to 100 μm.

[0063] Example 6

[0064] This embodiment provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and that of Embodiment 1 is:

[0065] In this embodiment, the thickness of the substrate layer is adjusted to 10 μm.

[0066] Compared with Example 1, the substrate layer of the thermochromic tape provided in Example 5 is too thick, which is not conducive to subsequent processing; the substrate layer of the thermochromic tape provided in Example 6 is too thin, which will result in the thermochromic tape having too low strength and being easy to break, thus affecting the packaging effect.

[0067] Example 7

[0068] This embodiment provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and that of Embodiment 1 is:

[0069] In this embodiment, the thickness of the color-changing adhesive layer is adjusted to 70 μm.

[0070] Example 8

[0071] This embodiment provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and that of Embodiment 1 is:

[0072] In this embodiment, the thickness of the color-changing adhesive layer is adjusted to 10 μm.

[0073] Compared with Example 1, the thermochromic tape provided in Example 7 has a thicker thermochromic adhesive layer, while the thermochromic tape provided in Example 8 has a thinner thermochromic adhesive layer. Both a thinner and thicker thermochromic adhesive layer will reduce the adhesive strength of the tape, thereby affecting the sealing effect of the tape.

[0074] Example 9

[0075] This embodiment provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and that of Embodiment 1 is:

[0076] In this embodiment, the structure of the color-changing adhesive layer is adjusted as follows: from the substrate layer to the release film layer, the color-changing adhesive layer includes a low-temperature color-changing adhesive strip, a medium-temperature color-changing adhesive strip, and a high-temperature color-changing adhesive strip stacked together.

[0077] Compared with Example 1, although the color-changing adhesive layer provided in this example can still change the color of the color-changing adhesive strip according to temperature changes, the color change is not clear due to the stacking arrangement, and it is impossible to achieve precise control of ambient temperature changes.

[0078] Comparative Example 1

[0079] This comparative example provides a thermochromic tape for encapsulation, the only difference between the thermochromic tape and Example 1 is that:

[0080] The color-changing adhesive layer described in this comparative example does not contain thermochromic materials and is not a thermosensitive color-changing adhesive layer.

[0081] Compared with Example 1, the tape provided in this comparative example cannot achieve color change due to temperature, and is no different from ordinary tape.

[0082] Comparative Example 2

[0083] This comparative example provides a thermochromic tape for encapsulation, the thermochromic tape comprising a thermosensitive coating layer, a substrate layer, an adhesive layer and a release film layer stacked sequentially.

[0084] Compared with Example 1, the adhesive layer provided in this comparative example does not have color change characteristics, and a temperature-sensitive coating needs to be set on the other side of the substrate layer. This structure is more complicated and not conducive to industrial production.

[0085] In summary, this invention forms a color-changing adhesive layer with color-changing function and excellent adhesion by mixing water-based adhesive and thermochromic material, which can indicate changes in ambient temperature during the packaging and transportation of packaged products; at the same time, the adhesive tape becomes less sticky after color change, making it easy to peel off and preventing delamination.

[0086] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A temperature-sensitive color-changing tape for encapsulation, characterized by, The thermochromic tape is a long strip, comprising a substrate layer, a color-changing adhesive layer and a release film layer stacked in sequence. The color-changing adhesive layer is a thermosensitive color-changing adhesive layer; in the direction perpendicular to the substrate layer, the color-changing adhesive layer includes at least two parallel color-changing adhesive strips; the colors of the color-changing adhesive strips are different.

2. The temperature-sensitive color-changing tape for encapsulation according to claim 1, characterized in that, The substrate layer has a transparent structure.

3. The temperature-sensitive color-changing tape for encapsulation according to claim 2, characterized in that, The substrate layer includes any one of a transparent PET layer, a transparent PP layer, or a transparent PVC layer.

4. The temperature-sensitive color-changing tape for encapsulation according to claim 3, characterized in that, The thickness of the substrate layer is 20~50μm.

5. The temperature-sensitive color-changing tape for encapsulation according to claim 1, wherein The thickness of the color-changing adhesive layer is 15~40μm.

6. The thermochromic tape for encapsulation according to claim 1, characterized in that, The color-changing adhesive strips include low-temperature color-changing adhesive strips, medium-temperature color-changing adhesive strips, and high-temperature color-changing adhesive strips arranged in parallel.

7. The temperature-sensitive color-changing tape for encapsulation according to claim 1, wherein The thickness of the release film is 25~30μm.

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