Envelope structure

Abstract

This utility model discloses a wrapping structure, including a wrapping layer. The wrapping layer includes a first bonding portion and a second bonding portion formed by bending from one side of the first bonding portion. The second bonding portion is used to bond with a second side. A bending portion is formed between the first bonding portion and the second bonding portion. The inner side of the bending portion is provided with a groove to release the stress generated by bending of the wrapping layer and prevent warping of the wrapping layer. This utility model effectively releases the stress generated when the wrapping layer is bent by providing a groove on the inner side of the bending portion of the wrapping layer, solving the problem of warping or even detachment of thin metal products after wrapping due to the reverse stress of the PET molding layer being greater than the bonding force of the base adhesive. At the same time, the layered design of the wrapping layer and the cooperation between the bonding portion and the bending portion, combined with the targeted setting of the groove, enable the wrapping structure to precisely bond with each side of the product, improving the bonding stability with the product, and is especially suitable for thin metal products with small thickness.

Description

Technical Field

[0001] This utility model relates to the field of adhesive bonding technology, and in particular to a wrapping structure. Background Technology

[0002] In the field of cushioning and protection for thin-walled hardware products, adhesive tape is often applied to the outer periphery of the hardware to achieve shock absorption and protection. In existing processes, the adhesive tape typically consists of PSA foam, PET, and a base adhesive, which is bent and wrapped around the outer periphery of the hardware (such as 0.2mm thick stamped aluminum alloy) to provide cushioning and protection. However, in actual production, it has been found that when the hardware thickness is small (e.g., ≤0.2mm), the adhesive tape warps or even detaches within minutes of application. The core reasons are: firstly, the contact area on the side of the hardware is small, resulting in insufficient adhesion of the base adhesive; secondly, the reverse stress generated by the PET molding layer after bending is greater than the adhesion of the base adhesive, causing stress concentration in the curved area of ​​the bend. This technical bottleneck seriously affects the reliability of the adhesive tape process for hardware, necessitating structural optimization to achieve stress release. Utility Model Content

[0003] To address the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a wrapping structure that optimizes the adhesive structure by processing grooves in the bending part to release the stress generated when the adhesive is bent, thereby avoiding stress concentration that could lead to warping.

[0004] To solve the above-mentioned technical problems, the present invention provides a wrapping structure for wrapping a product, the product having a first side and a second side adjacent to it and facing different directions; including a wrapping layer, the wrapping layer including a first fitting portion that fits against the first side and a second fitting portion that is bent from one side of the first fitting portion, the second fitting portion being used to fit against the second side, a bending portion being formed between the first fitting portion and the second fitting portion, the inner side of the bending portion being provided with a groove for releasing the stress generated by the bending of the wrapping layer to avoid warping of the wrapping layer.

[0005] Furthermore, the product also has a third side opposite to the first side and a fourth side opposite to the second side, the second side and the fourth side being formed on both sides of the first side and the third side, respectively; the wrapping layer also has a third fitting portion that fits to the third side and a fourth fitting portion that fits to the fourth side, a bending portion is formed between each pair of interconnected fitting portions, and each bending portion has the slot.

[0006] Furthermore, the first and third sides are both configured as the wide sides of the product, and the second and fourth sides are both configured as the narrow sides of the product; the second and fourth bonding portions are both provided with the groove.

[0007] Furthermore, the wrapping layer includes a protective layer that serves as a buffer and protector, a shaping layer that allows the protective layer to be shaped to surround the outer periphery of the product, and an adhesive layer that fixes the protective layer and the shaping layer to the outer periphery of the product. The protective layer, the shaping layer, and the adhesive layer are stacked sequentially from the outside to the inside.

[0008] The slots are formed in the shaping layer and adhesive layer of each bend; or, the slots are formed in the shaping layer and adhesive layer of each bend, the second bonding part, and the fourth bonding part.

[0009] Furthermore, the groove includes a first groove formed on the shaping layer and a second groove formed on the adhesive layer, wherein the first groove and the second groove are formed correspondingly to facilitate bending of the shaping layer and the adhesive layer.

[0010] Furthermore, the first groove is formed by recessing the shaping layer from the side near the adhesive layer to the side away from the adhesive layer, and the second groove is formed on the adhesive layer at a position corresponding to the first groove. The second groove matches the first groove and penetrates the adhesive layer along the thickness direction of the adhesive layer so that the second groove communicates with the first groove.

[0011] Furthermore, the first groove is formed along the length of the fold line of the bent portion.

[0012] Furthermore, the number of the first grooves is configured to be several, and the several first grooves are evenly spaced along the direction parallel to the crease of the bending portion.

[0013] Furthermore, the number of the first grooves is configured to be several, wherein a portion of the first grooves are evenly spaced along the direction parallel to the crease of the bending portion, and another portion of the first grooves are evenly spaced along the direction perpendicular to the crease of the bending portion, and the several first grooves intersect each other to form several grid patterns.

[0014] Furthermore, the protective layer is PSA foam, and the thickness of the PSA foam is 0.3 to 0.36 mm;

[0015] The shaping layer is a PET sheet with a thickness of 0.08 to 0.096 mm;

[0016] The adhesive layer is an adhesive tape with a thickness of 0.04 to 0.048 mm.

[0017] The wrapping structure of this utility model has at least the following beneficial effects: By setting grooves (including a first groove on the shaping layer and a second groove on the adhesive layer, which are correspondingly connected) on the inner side of the bent portion of the wrapping layer, the structure can effectively release the stress generated when the wrapping layer is bent. This solves the problem of warping or even detachment of thin metal products after wrapping due to the reverse stress of the PET shaping layer being greater than the bonding force of the base adhesive. Simultaneously, the layered design of the wrapping layer (protective layer, shaping layer, adhesive layer) and the coordination between the adhesive and bent portions, combined with the targeted setting of the grooves (such as opening along the crease direction or forming a grid shape), enable the wrapping structure to precisely fit the sides of the product, improving the bonding stability. It is especially suitable for thin metal products with smaller thicknesses, combining buffer protection with enhanced adhesive bonding reliability, and better adapting to products with different facing sides. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the first embodiment of the wrapping structure of this utility model;

[0020] Figure 2 This is a partial structural diagram of the wrapping layer in Embodiment 1 of the wrapping structure of this utility model;

[0021] Figure 3 This is a structural diagram of the product in Embodiment 2 of the packaging structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the second embodiment of the wrapping structure of this utility model;

[0023] Figure 5 This is a partial structural diagram of the wrapping layer in Embodiment 2 of the present invention;

[0024] Figure 6 This is a schematic diagram of the wrapping layer in Embodiment 2 of the present invention;

[0025] Figure 7 for Figure 6 A schematic diagram of the local structure at point A in the middle;

[0026] Figure 8 This is a partial structural diagram of the wrapping layer in Embodiment 3 of the present invention;

[0027] Figure 9 This is a schematic diagram of the wrapping layer in Embodiment 3 of the present invention;

[0028] Figure 10 for Figure 9 A schematic diagram of the local structure at point B.

[0029] The meanings of the labels in the attached diagram are as follows:

[0030] Product 1, First side 11, Second side 12, Third side 13, Fourth side 14, Wrapping layer 2, First bonding part 21, Second bonding part 22, Third bonding part 23, Left half 231, Right half 232, Fourth bonding part 24, Bending part 25, Protective layer 26, Shaping layer 27, Adhesive layer 28, Groove 3, First groove 31a, 31b, Second groove 32a, 32b. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] Example 1:

[0033] The wrapping structure of this utility model is used to wrap product 1 to provide cushioning and protection, and includes a wrapping layer 2. To more clearly illustrate the structure of the wrapping layer 2, the appearance of product 1 will be described first.

[0034] Please refer to Figure 1 and Figure 2 The product 1 has a first side 11 and a second side 12 adjacent to the first side 11 and facing a different direction. The wrapping layer 2 has a first fitting portion 21 that fits against the first side 11 and a second fitting portion 22 formed by bending from one side of the first fitting portion 21. The second fitting portion 22 is used to fit against the second side 12. A bending portion 25 is formed between the first fitting portion 21 and the second fitting portion 22, and the inner side of the bending portion 25 is provided with a groove 3 for releasing the stress generated by bending the wrapping layer 2 to avoid warping of the wrapping layer 2.

[0035] The wrapping layer 2 includes a protective layer 26 that provides cushioning and protection, a shaping layer 27 that allows the protective layer 26 to be molded to surround the outer periphery of the product 1, and an adhesive layer 28 that fixes the protective layer 26 and the shaping layer 27 to the outer periphery of the product 1. The protective layer 26, the shaping layer 27, and the adhesive layer 28 are stacked sequentially from the outside to the inside. Both the first bonding portion 21 and the second bonding portion 22 include the above three layers.

[0036] The slot 3 is formed in the shaping layer 27 and the adhesive layer 28 of the bent portion 25. Specifically, the slot 3 includes a first slot 31a formed in the shaping layer 27 and a second slot 32a formed in the adhesive layer 28. The first slot 31a is formed by recessing the shaping layer 27 from the side closer to the adhesive layer 28 to the side farther away from the adhesive layer 28. In a transverse cross-section, the width of the first slot 31a gradually narrows from the side farther away from the protective layer 26 to the side closer to the protective layer 26. The first slot 31a is formed along the length direction of the bending crease of the bent portion 25. The second slot 32a is formed in the adhesive layer 28 at a position corresponding to the first slot 31a. The second slot 32a matches the first slot 31a and penetrates the adhesive layer 28 along the thickness direction so that the second slot 32a communicates with the first slot 31a. Viewed in cross-section, the width of the second groove 32a gradually narrows from away from the shaping layer 27 to near the shaping layer 27. This gradual width variation of the first groove 31a and the second groove 32a ensures that when the shaping layer 27 and the adhesive layer 28 are bent, the first groove 31a and the second groove 32a can provide sufficient narrowing to reduce the stress on the bent portion 25.

[0037] The number of first grooves 31a is configured to be a plurality, and the plurality of first grooves 31a are evenly spaced along a direction parallel to the crease of the bending portion 25. The number of second grooves 32a is configured to correspond one-to-one with the first grooves 31a, and each second groove 32a corresponds to one first groove 31a.

[0038] The protective layer 26 is PSA foam with a thickness of 0.3–0.36 mm. The shaping layer 27 is a PET sheet with a thickness of 0.08–0.096 mm. The adhesive layer 28 is an adhesive tape with a thickness of 0.04–0.048 mm.

[0039] One embodiment of the wrapping structure of this utility model operates as follows: When it is necessary to wrap product 1, the first groove 31a and the second groove 32a are machined at the corresponding positions of the wrapping layer 2 according to the size of product 1. The machined wrapping layer 2 is then wrapped around the outer periphery of product 1 with the adhesive layer 28 facing inward.

[0040] Example 2:

[0041] Based on Embodiment 1, in addition to the first side 11 and the second side 12, the product 1 also has a third side 13 and a fourth side 14. The four sides are connected sequentially; that is, the first side 11 and the second side 12 are adjacent but face different directions, the second side 12 and the third side 13 are adjacent but face different directions, and so on. The first side 11 and the third side 13 are opposite faces, and the second side 12 and the fourth side 14 are opposite faces. Furthermore, the first side 11 and the third side 13 are both configured as the wide sides of product 1b, and the second side 12 and the fourth side 14 are both configured as the narrow sides of product 1. Please refer to... Figure 3 .

[0042] Please refer to Figures 4 to 7 Corresponding to product 1, the wrapping layer 2 also has a third bonding portion 23 for bonding with the third side 13 and a fourth bonding portion 24 for bonding with the fourth side 14. The third bonding portion 23 includes a left half 231 and a right half 232 that are separated from each other. The second bonding portion 22 is bent from one side of the first bonding portion 21, and the fourth bonding portion 24 is bent from the other side of the first bonding portion 21. The left half 231 is bent from the side of the second bonding portion 22 away from the first bonding portion 21, and the right half 232 is bent from the side of the fourth bonding portion 24 away from the first bonding portion 21. A bending portion 25 is formed between each pair of interconnected bonding portions. The inner surface of each bending portion 25 is provided with a groove 3 for releasing the pressure generated by bending of the wrapping layer 2. This stress release effectively prevents the wrapping layer 2 from warping.

[0043] The structure of the first groove 31a and the second groove 32a on the bent portion is the same as that in Embodiment 1, so it will not be described in detail here.

[0044] Furthermore, the groove 3 can also be formed on the shaping layer 27 and the adhesive layer 28 of the second bonding portion 22 and the fourth bonding portion 24. That is, in addition to being formed on the bending portion 25, the groove 3 is also formed on the two narrow sides of the product 1 to better release the stress generated by the bending of the wrapping layer 2.

[0045] Example 3:

[0046] The only difference between this embodiment and Embodiment 2 is the arrangement of the first tank 31b and the second tank 32b. Please refer to... Figure 8 , Figure 9 and Figure 10In this embodiment, several first grooves 31b are configured, with a portion of the first grooves 31b evenly spaced along a direction parallel to the crease of the bent portion 25, and another portion of the first grooves 31b evenly spaced along a direction perpendicular to the crease of the bent portion 25. These two portions of the first grooves 31b intersect each other to form several grid patterns. Several second grooves 32b are configured to correspond one-to-one with several of the first grooves 31b, with each second groove 32b corresponding to one of the first grooves 31b. This further improves the fit between the bent portion 25 and the product 1, and better releases the stress of the bent portion 25. The operation of this embodiment is the same as that of Embodiment 1, so it will not be described in detail here.

[0047] Compared with the prior art, the wrapping structure of this utility model effectively releases the stress generated when the wrapping layer is bent by setting grooves on the inner side of the bent portion of the wrapping layer (including a first groove on the shaping layer and a second groove on the adhesive layer, which are connected to each other). This solves the problem of warping or even falling off of thin metal products after wrapping due to the reverse stress of the PET shaping layer being greater than the bonding force of the base adhesive. At the same time, the layered design of the wrapping layer (protective layer, shaping layer, adhesive layer) and the cooperation between the adhesive part and the bent part, combined with the targeted setting of the grooves (such as opening along the crease direction or forming a grid shape), enable the wrapping structure to accurately fit the sides of the product, improving the bonding stability with the product. It is especially suitable for thin metal products with a small thickness, which not only takes into account the cushioning and protection function, but also enhances the reliability of the adhesive process, and can better adapt to products with different facing sides.

Claims

1. A wrapping structure for wrapping a product, said product having a first side and a second side adjacent thereto and facing in a different direction; comprising a wrapping layer, characterised in that: The wrapping layer includes a first fitting portion that fits against the first side and a second fitting portion that is bent from one side of the first fitting portion. The second fitting portion is used to fit against the second side. A bend is formed between the first fitting portion and the second fitting portion. The inner side of the bend is provided with a groove for releasing the stress generated by bending the wrapping layer to avoid warping of the wrapping layer.

2. The wrapped structure of claim 1, wherein: The product also has a third side opposite to the first side and a fourth side opposite to the second side, the second side and the fourth side being formed on both sides of the first side and the third side, respectively; the wrapping layer also has a third fitting portion that fits to the third side and a fourth fitting portion that fits to the fourth side, a bending portion is formed between each pair of interconnected fitting portions, and each bending portion has the slot.

3. The wrapped structure of claim 2, wherein: The first and third sides are both configured as the wide sides of the product, and the second and fourth sides are both configured as the narrow sides of the product; the second and fourth bonding portions are both provided with the slots.

4. The wrapping structure of claim 2 or 3, wherein: The wrapping layer includes a protective layer that provides cushioning and protection, a shaping layer that allows the protective layer to be shaped to surround the outer periphery of the product, and an adhesive layer that fixes the protective layer and the shaping layer to the outer periphery of the product. The protective layer, the shaping layer, and the adhesive layer are stacked sequentially from the outside to the inside. The slots are formed in the shaping layer and adhesive layer of each bend; or, the slots are formed in the shaping layer and adhesive layer of each bend, the second bonding part, and the fourth bonding part.

5. The package structure of claim 4, wherein: The groove includes a first groove formed on the shaping layer and a second groove formed on the adhesive layer. The first groove and the second groove are formed correspondingly to facilitate bending of the shaping layer and the adhesive layer.

6. The wrapped structure of claim 5, wherein: The first groove is formed by recessing the shaping layer from the side near the adhesive layer to the side away from the adhesive layer. The second groove is formed on the adhesive layer at a position corresponding to the first groove. The second groove matches the first groove and penetrates the adhesive layer along the thickness direction so that the second groove communicates with the first groove.

7. The wrapping structure as described in claim 6, characterized in that: The first groove is formed along the length of the fold line of the bent portion.

8. The wrapping structure as described in claim 7, characterized in that: The number of the first grooves is configured to be several, and the several first grooves are evenly spaced along the direction parallel to the crease of the bend.

9. The wrapping structure as described in claim 6, characterized in that: The number of the first grooves is configured to be several, wherein a portion of the first grooves are evenly spaced along the direction parallel to the crease of the bend, and another portion of the first grooves are evenly spaced along the direction perpendicular to the crease of the bend. The several first grooves intersect each other to form several grid patterns.

10. The wrapping structure as described in claim 9, characterized in that: The protective layer is PSA foam, and the thickness of the PSA foam is 0.3 to 0.36 mm; The shaping layer is a PET sheet with a thickness of 0.08 to 0.096 mm; The adhesive layer is an adhesive tape with a thickness of 0.04 to 0.048 mm.

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