Easily-torn sealing film and package

Abstract

The invention provides an easy-to-tear sealing film and a package, and belongs to the technical field of food packaging. The heat sealing film comprises a connecting part used for being connected with the packaging opening and a separating part located on the inner side of the connecting part, and a laser cutting line is arranged at the joint of the connecting part and the separating part so that the separating part and the connecting part can be selectively separated. The laser cutting line is arranged at the joint of the connecting part and the separating part, so that the connecting part and the separating part can be selectively separated. The laser cutting lines are formed in a laser cutting mode, the process is simple, and operation is convenient. The easy-to-tear sealing film is provided with a barrier layer and the heat sealing film, when the easy-to-tear sealing film is torn, the separation part can be separated from the connecting part in at least partial areas under the action of the binding force of the barrier layer, and in the process, the connecting part is always connected with a packaging opening. The easy-to-tear sealing film can be effectively uncovered with small force in the process, and eating is convenient.

Description

Technical Field

[0001] This invention relates to the field of food packaging technology, and more specifically, to an easy-tear sealing film and packaging. Background Technology

[0002] Traditionally, yogurt is usually packaged in glass or ceramic bottles and jars. However, with the continuous improvement of packaging technology, plastic, composite flexible packaging materials and containers have become the mainstay of dairy product packaging.

[0003] Currently, common yogurt packaging uses heat sealing to cover the packaging opening with a film structure. However, due to the strong heat seal, the bonding force between the sealing film and the packaging opening is large, making it difficult to effectively separate the sealing film from the packaging opening under relatively small forces.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an easy-tear sealing film and packaging to solve or improve the above-mentioned technical problems.

[0006] This invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a separable heat-sealing film, the heat-sealing film including a connecting portion for connecting to a packaging opening and a separating portion located inside the connecting portion, wherein a laser cutting line is provided at the connection between the connecting portion and the separating portion to achieve selective separation of the separating portion and the connecting portion.

[0008] In an optional embodiment, the laser cutting line has at least one of the following characteristics:

[0009] Feature 1: The width of the laser cutting line is 0.7mm to 9mm;

[0010] Feature 2: The laser cutting lines are continuous or intermittent.

[0011] In an optional implementation, when the laser cutting line is discontinuous, the laser cutting line is formed by multiple segments in a discontinuous manner, and the distance between two adjacent segments is 1mm to 9mm.

[0012] Secondly, the present invention provides an easy-tear sealing film, which includes a barrier layer and a heat-sealing film according to any of the above embodiments;

[0013] The barrier layer is attached to one side surface of the heat-sealing film; when the easy-tear seal is removed, at least a portion of the barrier layer with the separation portion separates from the connection portion to form an opening.

[0014] In an optional embodiment, the easy-tear sealing film also includes a printed protective layer on the surface of the barrier layer away from the heat-sealing film.

[0015] In an optional embodiment, the heat-sealing bond between the connecting part and the packaging opening is greater than the bond between the separating part and the barrier layer, and the heat-sealing bond between the connecting part and the packaging opening is greater than the bond between the connecting part and the barrier layer.

[0016] In an optional embodiment, the barrier layer has a tear guide that extends outward along the edge of the packaging opening.

[0017] Thirdly, the present invention proposes a method for preparing an easy-tear sealing film according to any of the above embodiments, comprising the following steps: connecting the heat-sealing film to the barrier layer, and laser cutting at the connection point between the connecting part and the separating part at a preset position.

[0018] In an optional implementation, the heat-sealing film is first laser-cut to form laser-cut lines, and then the heat-sealing film with the laser-cut lines is connected to the barrier layer.

[0019] In an optional implementation, the heat-sealing film is first connected to the barrier layer, and then the heat-sealing film is laser-cut to form a laser-cut line.

[0020] In an optional embodiment, the laser cutting power is 20W to 130W, the laser cutting thickness is 1μm to 200μm, and the laser cutting speed is 0.1m / s to 3m / s.

[0021] In an optional implementation, the laser cutting power is 70W to 90W, and the laser cutting thickness is 2μm to 90μm.

[0022] Fourthly, the present invention provides a package comprising a package body and an easy-tear sealing film as described in any of the above embodiments;

[0023] The packaging body has a packaging opening, and an easy-tear sealing film is used to seal the packaging opening.

[0024] In an optional implementation, the projection of the laser cutting line onto the plane containing the packaging opening is located inside the packaging opening.

[0025] In an optional implementation, the shortest distance between the initial separation point of the barrier layer and the packaging opening and the laser cutting line is 0.5 mm to 19 mm.

[0026] The beneficial effects of this invention include:

[0027] By dividing the heat-sealable film into a connecting section and a separating section using laser cutting lines, selective separation of the connecting and separating sections can be achieved at the laser cutting lines. The aforementioned laser cutting lines are formed using a simple and convenient process. The easy-tear seal film, with its barrier layer and the aforementioned heat-sealable film, allows the separating section to separate from the connecting section at least partially at the laser cutting lines under the binding force of the barrier layer when the easy-tear seal film is torn off. During this process, the connecting section remains connected to the packaging opening. This process requires only a small amount of force to effectively open the easy-tear seal film, facilitating the consumption of the contents inside the packaging. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of each layer in the easy-tear sealing film provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the easy-tear sealing film combined with packaging provided by the present invention;

[0031] Figure 3 This is a schematic diagram of a heat-sealing film in an easy-tear sealing film provided by the present invention;

[0032] Figure 4 This is a schematic diagram of a barrier layer in an easy-tear sealing film provided by the present invention.

[0033] Figure 5 A schematic diagram of the separation portion of the barrier layer and the heat-sealing film after the easy-tear sealing film provided by the present invention is separated from the packaging;

[0034] Figure 6 Another structural schematic diagram of the separation part of the barrier layer and the heat-sealing film after the easy-tear sealing film provided by the present invention is separated from the packaging;

[0035] Figure 7 This is a schematic diagram of a structure of the heat-sealing film connection portion in the easy-tear sealing film provided by the present invention.

[0036] Icons: 10-Heat-sealing film; 11-Connecting part; 111-First area; 112-Second area; 113-Blocking area; 12-Separation part; 121-Transition area; 122-Main body area; 123-Notch; 13-Opening; 20-Barrier layer; 14-Laser cutting line; 21-Tear guide line; 22-Tear guide part; 30-Printed protective layer; 41-Starting end; 51-Packaging body; 52-Packaging opening. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, the use of terms such as "horizontal" or "vertical" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 invention based on the specific circumstances.

[0043] The easy-tear sealing film and packaging provided by the present invention will be described in detail below.

[0044] Please combine Figures 1 to 7 The present invention provides a separable heat-sealing film 10, which includes a connecting portion 11 for connecting to a packaging opening 52 and a separating portion 12 located inside the connecting portion 11. A laser-cut line 14 is provided at the connection point between the connecting portion 11 and the separating portion 12 to achieve selective separation of the separating portion 12 from the connecting portion 11 (e.g., ...). Figure 3 (As shown).

[0045] The term "inner side" can be understood as an inward direction on the same horizontal plane. For example, the connecting part 11 is annular, and the separating part 12 is located in the hollowed-out portion in the middle of the annular shape. The annular shape can be, for example, a circular ring or a square ring, or other annular geometric shapes.

[0046] With the easy-tear seal removed, at least a portion of the separating portion 12 separates from the connecting portion 11 at the location of the laser cutting line 14 to form an opening 13 (e.g., ...). Figure 2 (As shown). In other words, by dividing the heat-sealing film 10 into a connecting part 11 and a separating part 12 by the laser cutting line 14, the connecting part 11 and the separating part 12 can be selectively separated at the laser cutting line 14.

[0047] The "selective separation" of the separating part 12 and the connecting part 11 can be understood as follows: before the film layer is peeled off, the separating part 12 and the connecting part 11 are in an integral connected state; during the process of peeling off the film layer, the separating part 12 and the connecting part 11 gradually separate at the location of the laser cutting line 14 until the separating part 12 and the connecting part 11 are completely separated, or the separating part 12 and the connecting part 11 are partially separated. The area where the separating part 12 and the connecting part 11 are separated forms an opening 13.

[0048] For example, the width of the laser cutting line 14 can be 0.7mm to 9mm, such as 0.7mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9mm, or other values ​​within the range of 0.7mm to 9mm.

[0049] In some embodiments, the laser cutting line 14 is continuous. In this case, the laser cutting line 14 can be a closed loop with its ends connected (e.g., Figure 6 As shown), it can also be in the form of a non-closed line segment (such as...). Figure 5 (As shown). In other embodiments, the laser cutting line 14 is discontinuous (e.g., Figure 3 (As shown). In this method, the laser cutting line 14 is formed by multiple segments in a discontinuous manner. The segments can be distributed in a ring-like pattern or in a common line segment pattern. It should be noted that, whether continuous or discontinuous, the line segments involved can be in the form of curves, broken lines, or straight lines, etc.

[0050] For example, when the laser cutting line 14 is formed by multiple segments in a discontinuous manner, the distance between two adjacent segments can be 1mm to 9mm, such as 1mm, 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9mm, or other values ​​within the range of 1mm to 9mm.

[0051] By setting the distance between two adjacent segments to 1mm to 9mm, it is ensured that the connecting part 11 and the separating part 12 can be effectively separated. If the distance between two adjacent segments is too large, the tearing force may not be effectively transmitted, making it impossible for the connecting part 11 and the separating part 12 to separate and obtain an opening 13 of a suitable size.

[0052] Accordingly, the present invention also provides an easy-tear sealing film, which includes a barrier layer 20 and the aforementioned heat-sealing film 10. The barrier layer 20 is attached to one side surface of the heat-sealing film 10; when the easy-tear sealing film is peeled off, at least a portion of the barrier layer 20 with the separation portion 12 separates from the connection portion 11 to form an opening 13.

[0053] The heat-sealing film 10 and the barrier layer 20 are stacked together. In use, the barrier layer 20 is disposed on the upper surface of the heat-sealing film 10 (e.g., Figure 1 (As shown).

[0054] The heat-sealing film 10 can be made of, for example, food-grade polyester or polyolefin materials, and the barrier layer 20 can be made of, for example, aluminum foil, PET aluminum plating, or other high-barrier materials.

[0055] In some embodiments, the size of the heat-sealing film 10 is the same as the size of the barrier layer 20; in other embodiments, the size of the heat-sealing film 10 is smaller than the size of the barrier layer 20 to facilitate peeling off the film.

[0056] The heat-sealing bond between the connecting portion 11 and the packaging opening 52 is greater than the bond between the separating portion 12 and the barrier layer 20, and the heat-sealing bond between the connecting portion 11 and the packaging opening 52 is greater than the bond between the connecting portion 11 and the barrier layer 20. During the process of peeling off the film, the barrier layer 20 will separate from the connecting portion 11 with the peeling force applied by the user. During the process of peeling off the barrier layer 20, when it is peeled to the connection point between the connecting portion 11 and the separating portion 12 (where the laser cutting line 14 is located), the barrier layer 20 will also peel off the separating portion 12 together, thereby making the separating portion 12 completely or partially separated from the connecting portion 11. That is, regardless of whether the easy-tear seal film is in the peeled or sealed state, the connecting portion 11 in its heat-sealing film 10 is always connected to the packaging opening 52, and the opening 13 is formed by the separation of the separating portion 12 and the connecting portion 11.

[0057] In some implementations, such as Figure 3 and Figure 6 As shown, the separating part 12 is in a closed shape, and when the easy-tear sealing film is removed, the separating part 12 is completely separated from the connecting part 11. That is, during the process of applying force to the barrier layer 20, the barrier layer 20 with the separating part 12 is completely peeled off, and is completely separated from the packaging opening 52.

[0058] The specific form of the aforementioned closed shape is not limited; for example, it can be a closed circle, semicircle, square, or fan shape. For example, the circumferential edge of the separating portion 12 can be a curve, a straight line, or a combination of curves and straight lines.

[0059] In other implementations, such as Figure 5 As shown, the separating part 12 has a notch 123. When the easy-tear seal is opened, the separating part 12 and the connecting part 11 are connected at the notch 123. That is, during the application of force to the barrier layer 20, the barrier layer 20 with the separating part 12 is peeled off from the starting end 41 of the opening 13 until it reaches the notch 123. At this point, the easy-tear seal is partially separated from the packaging opening 52. This method facilitates the recycling of the entire packaging.

[0060] The aforementioned "starting end 41" refers to the end where the barrier layer 20 first separates from the heat-sealing film 10 during the peeling process. The aforementioned notch 123 can be set according to specific circumstances, and its specific location and size are not limited.

[0061] In some embodiments, the inner edge of the connecting portion 11 near the starting end 41 of the opening 13 extends inward along the innermost edge of the packaging opening 52. For ease of understanding, the region of the connecting portion 11 near the starting end 41 of the opening 13 is defined as the first region 111 (e.g., Figure 7 as well as Figure 5As shown, regarding the first region 111, its outer edge can be flush with the outermost edge of the packaging opening 52, and its inner edge extends inward along the innermost edge of the packaging opening 52. This extended area forms a blocking area 113, which can provide some obstruction to the contents inside the packaging, thereby helping to prevent the contents from spraying out directly during the process of peeling off the film. Furthermore, the outer edge of the first region 111 can extend outward along the outermost edge of the packaging opening 52, and the inner edge of the first region 111 can extend inward along the innermost edge of the packaging opening 52. Similarly, the inwardly extending area forms the blocking area 113. For example, the projection of the outer edge of the first region 111 onto the plane of the packaging opening 52 can be located between the outer and inner edges of the packaging opening 52, and the inner edge of the first region 111 can extend inward along the innermost edge of the packaging opening 52. The inwardly extending area forms the blocking area 113. In some typical embodiments, the width of the starting end 41 of the connecting portion 11 near the opening 13 is not less than the width of the packaging opening 52.

[0062] Accordingly, the region of the connecting portion 11 away from the starting end 41 of the opening 13 is defined as the second region 112 (e.g., Figure 7 As shown, regarding the second region 112, its outermost edge can be flush with the outermost edge of the packaging opening 52, or it can extend outward from the outermost edge of the packaging opening 52. Furthermore, the projection of the outermost edge of the second region 112 onto the plane containing the packaging opening 52 can also be located between the outermost and inner edges of the packaging opening 52. Similarly, the innermost edge of the second region 112 can be flush with the innermost edge of the packaging opening 52, or it can extend inward from the innermost edge of the packaging opening 52.

[0063] In some embodiments, the distance by which the connecting portion 11 extends inward from the starting end 41 of the opening 13 is greater than the distance by which the connecting portion 11 extends inward from the starting end 41 of the opening 13. That is, the distance by which the inner edge of the first region 111 extends inward along the innermost edge of the packaging opening 52 is greater than the distance by which the inner edge of the second region 112 extends inward along the innermost edge of the packaging opening 52.

[0064] In some embodiments, the projection of the laser cutting line 14 onto the plane of the packaging opening 52 is located inside the packaging opening 52. In this case, the position of the laser cutting line 14 can be considered as the inner edge of the connecting portion 11. In some embodiments, the shortest distance between the initial separation position of the barrier layer 20 and the packaging opening 52 and the laser cutting line 14 can be 0.5mm to 19mm, such as 0.5mm, 1mm, 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 15mm, or 19mm, or other values ​​within the range of 0.5mm to 19mm. In some preferred embodiments, the shortest distance between the initial separation position of the barrier layer 20 and the packaging opening 52 and the laser cutting line 14 can be 1.0mm to 1.2mm, such as 1.1mm.

[0065] In this embodiment, the shapes of the connecting part 11 and the separating part 12 are not limited. They can be independently circular, square, triangular, other polygonal or irregular shapes, etc., by way of example but not limitation.

[0066] In some implementations, such as Figure 5 As shown, the separation section 12 includes a transition region 121 and a main body region 122 connected in sequence. The transition region 121 is located on the side of the main body region 122 near the starting end 41 of the opening 13. In some more specific embodiments, the radius of curvature of the main body region 122 is smaller than the radius of curvature of the transition region 121. A chamfer may be provided at the connection between the transition region 121 and the main body region 122. With the above arrangement, it is more convenient for the separation section 12 to be peeled off along with the barrier layer 20 during the peeling process. In addition, the separation section 12 may also not include the transition region 121, such as... Figure 6 As shown.

[0067] In this embodiment, the barrier layer 20 is provided with a tear-guide line 21 at the starting end 41 of the opening 13 (e.g., Figure 2 , Figures 4 to 6 As shown in the diagram, for example, a tear line 21 may be provided at the edge of the packaging opening 52. By providing the tear line 21, a tear-guiding function can be achieved, making it easier for the user to apply force from here to separate the barrier layer 20 from the heat-sealing film 10.

[0068] In some implementations, with Figure 4 In some embodiments, the tear line 21 can be set horizontally; in other embodiments, the tear line 21 can also be set vertically; in still other embodiments, the tear line 21 can also be set at a certain angle to the vertical direction.

[0069] The shape of the aforementioned tear line 21 is not limited; it may include, for example but not exclusively, a wavy shape (such as...). Figure 6 (as shown) or broken line shape (such as) Figure 4 and Figure 5(as shown). When the tear line 21 is wavy, it can be a continuous and uniform wave shape, with the radius of curvature of the arc corresponding to each wave being the same or different. When the tear line 21 is zigzag, the zigzag can be sawtooth-shaped, and the shape of the sawtooth can be, for example, a triangle or a square. In addition, the tear line 21 may also include wavy areas and zigzag areas at the same time. The wavy areas and zigzag areas can be arranged alternately or continuously (that is, one side is a continuous wavy shape and the other side is a continuous zigzag shape). In some embodiments, the tear line 21 can be discontinuous.

[0070] In some embodiments, the number of tear lines 21 is only one (e.g. Figure 4 and Figure 6 (As shown). In some other embodiments, the tear line 21 is multiple (e.g. Figure 5 As shown, multiple tear lines 21 are arranged sequentially at intervals along the tearing direction of the easy-tear seal (e.g., spaced apart in parallel or non-parallel arrangements). For example, when there are multiple tear lines 21, there can be two, three, or more. Furthermore, in some other embodiments, when there are multiple tear lines 21, taking two as an example, one end of the second tear line 21 can be connected to any position of the first tear line 21, thereby allowing the tearing position to transition from the first tear line 21 to the second tear line 21.

[0071] Furthermore, such as Figure 2 as well as Figures 4 to 6 As shown, the barrier layer 20 of the easy-tear sealing film also has a tear guide 22, which extends outward along the edge of the packaging opening 52. Alternatively, the barrier layer 20 can be understood as including a main body and the tear guide 22; the main body covers the packaging opening 52, and the tear guide 22 extends outward from the main body. This tear guide 22 facilitates the user's gripping or pinching, thus enabling further force to peel off the film.

[0072] The shape of the main body can be adapted to the shape of the packaging opening 52. For example, if the packaging opening 52 is circular, the main body of the barrier layer 20 can also be circular; if the packaging opening 52 is square, the main body of the barrier layer 20 can also be square.

[0073] In some embodiments, the barrier layer 20 is teardrop-shaped, thereby making the easy-tear seal film also appear teardrop-shaped overall. Furthermore, the shapes of the barrier layer 20 and the easy-tear seal film can be adjusted as needed, and this application does not impose any specific limitations on them.

[0074] In some embodiments, the tear guide 22 is also provided with an anti-slip structure. For example, the anti-slip structure may be provided on the upper surface of the tear guide 22, or on the lower surface of the tear guide 22, or both the upper and lower surfaces of the tear guide 22 may be provided with an anti-slip structure.

[0075] The anti-slip structure can be a protruding contact point from the surface of the guide tear part 22, or it can be other structures such as anti-slip texture that can increase the friction between the hand and the guide tear part 22. The specific form, number and distribution of the anti-slip structure in the guide tear part 22 are not specifically limited in this embodiment.

[0076] In some embodiments, the easy-tear seal film may also include a printed protective layer 30 (e.g., Figure 1 As shown, the printed protective layer 30 is located on the surface of the barrier layer 20 on the side away from the heat-sealing film 10.

[0077] The size of the printed protective layer 30 can be the same as that of the barrier layer 20, or it can be smaller than that of the barrier layer 20.

[0078] Furthermore, the present invention proposes a method for preparing the above-mentioned easy-tear sealing film, comprising the following steps: connecting the heat-sealing film 10 to the barrier layer 20, and performing laser cutting at the connection point of the connecting part 11 and the separating part 12 at a preset position.

[0079] The laser cutting line 14 mentioned above is formed by laser cutting, which is simple and easy to operate.

[0080] In some embodiments, the heat-sealing film 10 may be laser-cut to form laser cutting lines 14, and then the heat-sealing film 10 with laser cutting lines 14 may be connected to the barrier layer 20. Further, the heat-sealing film 10 may be laser-cut to form laser cutting lines 14, and then the heat-sealing film 10 with laser cutting lines 14 may be connected to the barrier layer 20 and the printed protective layer 30.

[0081] In other embodiments, the heat-sealing film 10 can be first connected to the barrier layer 20 and the printed protective layer 30, and then the heat-sealing film 10 can be laser-cut to form laser-cut lines 14.

[0082] In some implementations, the power of laser cutting can be 20W to 130W, such as 20W, 40W, 60W, 80W, 100W, 120W or 130W, or other values ​​within the range of 20W to 130W.

[0083] The thickness of the laser cutting can range from 1μm to 200μm, such as 1μm, 10μm, 20μm, 50μm, 100μm, 120μm, 150μm, 180μm, or 200μm, or other values ​​within the range of 1μm to 200μm. Specifically, the thickness of the laser cutting depends on the specific dimensions of the packaging, and preferably should not exceed the thickness of the heat-sealing film 10, that is, while cutting the heat-sealing film 10, the barrier layer 20 should be avoided.

[0084] The laser cutting speed can be from 0.1m / s to 3m / s, such as 0.1m / s, 0.5m / s, 1m / s, 1.5m / s, 2m / s, 2.5m / s or 3m / s, or other values ​​within the range of 0.1m / s to 3m / s.

[0085] In some preferred embodiments, the laser cutting power is 70W to 90W (e.g., 70W, 75W, 80W, 85W or 90W), and the laser cutting thickness is 2μm to 90μm (e.g., 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm or 90μm).

[0086] It should be noted that if the laser cutting power is too low, the laser cutting line 14 will not cut through and will stick together; if the laser cutting power is too high, the laser cutting line 14 will damage other layers. If the laser cutting speed is too slow, it is not conducive to material protection, and excessive local heating will damage the material; if the laser cutting speed is too fast, it is not conducive to the formation of the tangent.

[0087] In some optional embodiments, the thickness of the heat-sealing film 10 can be 35μm to 90μm (e.g., 35μm, 40μm, 50μm, 60μm, 70μm, 80μm or 90μm, etc.), the thickness of the barrier layer 20 can be 7μm to 45μm (e.g., 7μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm or 45μm, etc.), and the thickness of the printed protective layer 30 can be 5μm to 12μm (e.g., 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm or 12μm, etc.).

[0088] In addition, the present invention also provides a package comprising a package body 51 and the aforementioned easy-tear sealing film.

[0089] The packaging body 51 has a packaging opening 52, and an easy-tear sealing film is used to seal the packaging opening 52.

[0090] The aforementioned packaging body 51 can be in the form of a bottle or a cup, etc.

[0091] The contents of the packaging are not limited to liquids and solids, but may also be fluid contents with a certain viscosity.

[0092] In some typical implementations, the packaging can be yogurt packaging.

[0093] The easy-tear seal film, having a barrier layer 20 and the aforementioned heat-sealing film 10, allows the separating portion 12 to separate from the connecting portion 11 at least partially at the laser-cut line 14 under the binding force of the barrier layer 20 when the easy-tear seal film is torn off. During this process, the connecting portion 11 remains connected to the packaging opening 52. This process requires only a small amount of force to effectively open the easy-tear seal film, facilitating the consumption of the contents inside the packaging.

[0094] Test case

[0095] This experiment investigated the peeling process of several types of cup-packaged yogurt. The test samples included samples A through I.

[0096] (1) The following describes each test sample.

[0097] Test sample A is as follows: Test sample A includes a cup body and an easy-tear sealing film sealed to the cup mouth. The easy-tear sealing film consists of a heat-sealing film 10, a barrier layer 20, and a printed protective layer 30, which are stacked sequentially from bottom to top. The heat-sealing film 10 has a thickness of 60 μm, the barrier layer 20 has a thickness of 20 μm, and the printed protective layer 30 has a thickness of 5 μm.

[0098] The barrier layer 20 includes a circular body and a tear-guided portion 22 extending outward from a portion of the body. The tear-guided portion 22 and the body together give the barrier layer 20 an overall teardrop shape. Correspondingly, the outer diameter of the body is 95.3 mm, and the longest dimension of the barrier layer 20 is 107 mm. The barrier layer 20 has two tear-guided lines 21 spaced apart sequentially along the tearing direction of the easy-tear sealant in the area corresponding to the starting end 41 of the opening 13. The distance between the two tear-guided lines 21 is 12.2 mm, and each tear-guided line 21 has a continuous and uniform wavy shape, with the radius of curvature of the arc corresponding to each wave being 10 mm.

[0099] The heat-sealing film 10 includes an annular connecting portion 11 and a closed separating portion 12 connected to the inside of the connecting portion 11. The connecting portion 11 and the separating portion 12 are provided with a discontinuous laser cutting line 14 at the connection position.

[0100] The laser cutting line 14 has a width of 1 mm and a distance of 1 mm between two adjacent segments. The preparation conditions of the laser cutting line 14 include: a laser cutting power of 80 W, a laser cutting thickness of 60 μm, and a laser cutting speed of 2 m / s.

[0101] The connecting portion 11 is heat-sealed to the packaging opening 52. The outer edge of the first region 111 of the connecting portion 11 is flush with the outermost edge of the packaging opening 52, and the inner edge of the first region 111 extends inward along the innermost edge of the packaging opening 52, forming a blocking region 113. The outermost edge of the second region 112 of the connecting portion 11 is flush with the outermost edge of the packaging opening 52, and the innermost edge of the second region 112 extends inward from the innermost edge of the packaging opening 52. The inward extension distance of the first region 111 is greater than the inward extension distance of the second region 112. The separating portion 12 includes a transition region 121 and a main body region 122 connected in sequence. The main body region 122 is concentrically arranged with the main body of the barrier layer 20. The outer diameter of the main body region 122 is 75.3 mm. The transition region 121 is connected to one end of the main body region 122 corresponding to the tear-off portion 22. The radius of curvature of the transition region 121 is greater than the radius of curvature of the main body region 122. The furthest distance from the connection point between the transition zone 121 and the main body zone 122 to all the tear lines 21 is 29mm, and the shortest distance from the starting separation position of the barrier layer 20 and the packaging opening 52 to the laser cutting line 14 is 1.1mm.

[0102] The dimensions of the printed protective layer 30 are the same as those of the barrier layer 20.

[0103] The difference between test sample B and test sample A is that the connection position between the connecting part 11 and the separating part 12 is not provided with a laser cutting line 14. It only satisfies that the heat sealing force between the connecting part 11 and the packaging opening 52 is greater than the bonding force between the separating part 12 and the barrier layer 20, and the heat sealing force between the connecting part 11 and the packaging opening 52 is greater than the bonding force between the connecting part 11 and the barrier layer 20.

[0104] The difference between test sample C and test sample A is that this sample is a conventional product for yogurt packaging, that is, the heat-sealed film is a whole and does not have a separable connecting part 11 and a separating part 12.

[0105] The difference between test sample D and test sample A is that the laser cutting power is 150W when forming the laser cutting line 14.

[0106] The difference between test sample E and test sample A is that the thickness of the laser cutting is 0.5 μm when forming the laser cutting line 14.

[0107] The difference between test sample F and test sample A is that the laser cutting speed is 0.05 m / s when forming the laser cutting line 14.

[0108] The difference between test sample G and test sample A is that the laser cutting speed is 4 m / s when forming the laser cutting line 14.

[0109] The difference between test sample H and test sample A is that the distance between two adjacent segments is 12 mm.

[0110] The difference between test sample I and test sample A is that the shortest distance from the initial separation position of the barrier layer 20 and the packaging opening 52 to the laser cutting line 14 is 10mm.

[0111] (2) The tearing force required for the easy-tear sealing film of the above test samples A to I was tested respectively. Each test sample was tested 5 times and the average value was taken. The results are shown in Table 1.

[0112] Table 1 Test Results

[0113]

[0114]

[0115] The results above show that sample A had the easiest-tear seal to be peeled off. Improper settings, such as the formation conditions of the laser cutting line 14 or incorrect dimensional relationships, can affect the peeling of the seal.

[0116] In summary, the easy-tear sealing film provided by this invention seals the packaging opening 52. When consumption is required, simply hold the packaging body 51 with one hand and pinch the guide tear section 22 with the other, applying force to the film layer. At this time, the barrier layer 20 and the heat-sealing film 10 begin to separate at the guide tear line 21. As the barrier layer 20 and the heat-sealing film 10 continue to separate, the connecting part 11 of the heat-sealing film 10 remains connected to the packaging opening 52. The barrier layer 20, along with the separating part 12 of the heat-sealing film 10, further separates from the packaging opening 52 at the laser cutting line 14 to form an opening 13. The above process allows the easy-tear sealing film to be effectively opened with relatively little force, facilitating consumption. Packaging with the above-mentioned easy-tear sealing film is convenient for consumers to use.

[0117] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A separable heat-sealable film, characterized by, The heat-seal film comprises a connecting part for connecting with a package opening and a separating part inside the connecting part, and a laser cutting line is arranged at the connecting part of the connecting part and the separating part to realize the selective separation of the separating part and the connecting part.

2. The heat sealable film according to claim 1, characterized in that, The laser cutting line has at least one of the following characteristics: Characteristic 1: the width of the laser cutting line is 0.7mm-9mm; Characteristic 2: the laser cutting line is continuous or intermittent; Optionally, when the laser cutting line is intermittent, the laser cutting line is formed by a plurality of segmentation sections in a punctate manner, and the distance between adjacent two segmentation sections is 1mm-9mm.

3. A tearable seal film characterized by, The easy-to-tear seal film comprises a barrier layer and the heat-seal film of claim 1 or 2; The barrier layer is connected to one side surface of the heat-seal film; In the state of the easy-to-tear seal film being peeled off, the barrier layer is separated from the connecting part with at least part of the separating part to form an opening; Optionally, the easy-to-tear seal film further comprises a printing protection layer on the side surface of the barrier layer away from the heat-seal film.

4. The easy-open lidding film of claim 3, wherein, The heat-seal bonding force between the connecting part and the package opening is greater than the bonding force between the separating part and the barrier layer, and the heat-seal bonding force between the connecting part and the package opening is greater than the bonding force between the connecting part and the barrier layer.

5. The easy-open lidding film of claim 3 or 4, wherein, The barrier layer has a tear guide part which extends outward along the edge of the package opening.

6. A method of producing a tearable closure film according to any one of claims 3 to 5, characterised in that, The method comprises the following steps: connecting the heat-seal film and the barrier layer, and performing laser cutting at the connecting part of the connecting part and the separating part in a predetermined position; Optionally, the heat-seal film is first laser cut to form the laser cutting line, and then the heat-seal film with the laser cutting line is connected with the barrier layer; Optionally, the heat-seal film is first connected with the barrier layer, and then the heat-seal film is laser cut to form the laser cutting line.

7. The production method according to claim 6, wherein The power of laser cutting is 20W-130W, the thickness of laser cutting is 1μm-200μm, and the speed of laser cutting is 0.1m / s-3m / s; Optionally, the power of laser cutting is 70W-90W, and the thickness of laser cutting is 2μm-90μm.

8. A package characterized in that, The package comprises a package body and the easy-to-tear seal film of any one of claims 3-5; The package body has a package opening, and the easy-to-tear seal film is used for sealing the package opening.

9. The package of claim 8, wherein, The projection of the laser cutting line on the plane of the package opening is located inside the package opening.

10. The package of claim 9, wherein, The shortest distance between the starting separation position of the barrier layer and the package opening and the laser cutting line is 0.5mm-19mm.

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