Sheet-like composite layer and packaging sheet material

Abstract

The sheet-like composite layer includes a carrier layer (10), a barrier layer (30), and an adhesive layer (20). The barrier layer is laminated on the carrier layer, and the adhesive layer is positioned between the carrier layer and the barrier layer and configured to bond the carrier layer and the barrier layer. The carrier layer has an opening (11), and the barrier layer and adhesive layer are configured to extend along the plane of the carrier layer and cover the opening. The carrier layer includes an edge (110) surrounding the opening, and gaps (G1, G2) are provided between the adhesive layer and the barrier layer in the thickness direction of the carrier layer, configured to extend along part of the edge. Since the gaps extend only along part of the edge, the sheet-like composite layer can reduce the force required to separate the opening, improving the ease of opening the package while reducing the light-transmitting area, which is advantageous for long-term storage of contents. Also provided is a packaging sheet material (100) including the sheet-like composite layer.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from Chinese Patent Application No. 202211054102.2, entitled "Sheet-Like Composite Layer and Packaging Sheet Material," filed on August 30, 2022, and the entire disclosure of the above Chinese patent application is hereby incorporated by reference as part of this application.

[0002] FIELD OF THE DISCLOSURE The present disclosure relates to the packaging field, and in particular to sheet-like composite layers and packaging sheet materials. [Background technology]

[0003] Disposable packaging containers typically used for liquid foods such as milk and fruit juice can be formed by cutting, shaping, filling, and sealing a continuous wide sheet-like composite layer. The sheet-like composite layer may include multiple laminated layers, such as an ink layer for printing a pattern, a carrier layer for supporting the material, and an aluminum foil layer for blocking moisture and oxygen. Summary of the Invention

[0004] Embodiments of the present disclosure provide sheet-like composite layers and packaging sheet materials.

[0005] According to a first aspect of the present disclosure, there is provided a sheet-like composite layer including a carrier layer, a barrier layer laminated on the carrier layer, and an adhesive layer located between the carrier layer and the barrier layer and configured to bond the carrier layer and the barrier layer, wherein the carrier layer has an opening, the barrier layer and the adhesive layer are configured to extend along a plane in which the carrier layer is located and cover the opening, the carrier layer includes an edge surrounding the opening, and a gap portion configured to extend along a portion of the edge is provided between the adhesive layer and the barrier layer in the thickness direction of the carrier layer.

[0006] In at least some embodiments, the carrier layer includes a sidewall located at the edge, the sidewall including a first sidewall and a second sidewall facing each other in a first direction parallel to a plane in which the carrier layer is located, the gap portion including a first gap portion and a second gap portion spaced apart from each other in the first direction, the first gap portion configured to extend along a portion of the first sidewall, and the second gap portion configured to extend along a portion of the second sidewall.

[0007] In at least some embodiments, the first gap and the second gap are not connected to each other.

[0008] In at least some embodiments, the first gap portion includes a first end and a second end opposite each other in a second direction, the second direction being parallel to the plane in which the carrier layer is located and perpendicular to the first direction, the second gap portion includes a third end and a fourth end opposite each other in the second direction, the first end and the third end being spaced apart from each other in the first direction, and the second end and the fourth end being spaced apart from each other in the first direction.

[0009] In at least some embodiments, the sheet-like composite layer further includes an outer cover layer laminated to the carrier layer and positioned on the opposite side of the carrier layer from the adhesive layer and the barrier layer, the outer cover layer configured to extend and cover the opening, and the outer cover layer adhered to the adhesive layer at the opening.

[0010] In at least some embodiments, an edge gap is defined between the carrier layer, the adhesive layer, and the outer cover layer, and the clearance is located in the edge gap.

[0011] In at least some embodiments, the carrier layer includes a sidewall located at the edge, the sidewall extending along the entire edge of the carrier layer such that the edge gap extends along the entire edge of the carrier layer.

[0012] In at least some embodiments, the gap portion includes a first gap portion and a second gap portion spaced apart from each other in a first direction, the edge gap includes a first gap portion and a second gap portion facing each other in the first direction, the first gap portion being located in the first gap portion, and the second gap portion being located in the second gap portion.

[0013] In at least some embodiments, the edge gap further includes a third gap portion and a fourth gap portion facing each other in the second direction, and both ends of the first gap portion, the second gap portion, the third gap portion, and the fourth gap portion are connected to form the edge gap, and the first gap portion and the second gap portion are not provided in either the third gap portion or the fourth gap portion.

[0014] In at least some embodiments, the first gap portion and the second gap portion include protrusions provided in the adhesive layer, the protrusions protruding in a thickness direction of the carrier layer away from the barrier layer.

[0015] In at least some embodiments, at least one of the first gap portion and the second gap portion has a first size along the first direction and a second size along the second direction, the second direction being parallel to the plane in which the carrier layer is located and perpendicular to the first direction, and the second size being larger than the first size.

[0016] In at least some embodiments, the opening has an opening size along the second direction, and the second size of the at least one of the first gap portion and the second gap portion is smaller than the opening size of the opening.

[0017] In at least some embodiments, the planar shape of the opening is circular, the opening size is a diameter d of the circle, the second size of at least one of the first gap portion and the second gap portion is a length L, and 0.1d≦L <dである。

[0018] In at least some embodiments, at least one of the first gap portion and the second gap portion has a cross-section along the thickness direction of the carrier layer, the opening has a centerline along the first direction, and in the second direction, the area of ​​the cross-section is configured to gradually decrease in the direction away from the centerline.

[0019] In at least some embodiments, the first size of at least one of the first gap portion and the second gap portion is a width, and the at least one of the first gap portion and the second gap portion has a third size along a third direction, the third size being a height, the third direction being perpendicular to a plane in which the carrier layer is located, and in the second direction, at least one of the height and the width is set to gradually decrease in a direction away from the center line.

[0020] In at least some embodiments, the height is less than or equal to one-half the thickness of the carrier layer.

[0021] In at least some embodiments, the opening size of the opening is 15 to 29 mm, the width is 150 to 200 μm, and the height is 150 to 200 μm.

[0022] In at least some embodiments, the at least one of the first gap and the second gap has a crescent shape in a plane parallel to a plane in which the carrier layer lies.

[0023] In at least some embodiments, the barrier layer may or may not include a metal layer.

[0024] According to a second aspect of the present disclosure, there is provided a packaging sheet material including the sheet-like composite layer described above.

[0025] In at least some embodiments, the packaging sheet material includes a folding pattern, the folding pattern including a first fold line and a second fold line, at least one of the first fold line and the second fold line extending along a second direction, the first fold line and the second fold line dividing the packaging composite sheet material into first, second and third regions distributed along the first direction, the first and second directions all being parallel to a plane in which the carrier layer is located and perpendicular to each other, and the opening and the gap portion are both located in the first region.

[0026] In at least some embodiments, the packaging sheet material is configured to be folded along the folding pattern to form a packaging container, the first region defines a top of the packaging container, the third region defines a bottom of the packaging container, the gap portion includes a first gap portion and a second gap portion spaced apart from each other in a first direction, and the first gap portion and the second gap portion are located at the top of the packaging container. [Brief explanation of the drawings]

[0027] In order to more clearly explain the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0028] [Figure 1] 1 is a schematic plan view of a packaging sheet material according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a partially enlarged schematic view of the packaging sheet material in FIG. [Figure 2A] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 2B] FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is clear that the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the described embodiments of the present disclosure, other embodiments that a person skilled in the art can obtain without paying creative labor all fall within the scope of protection of the present disclosure.

[0030] Unless otherwise defined, technical or scientific terms used herein have the common meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in the specification and claims of this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish between different components. Similar terms, such as "including" or "including," mean that the elements or objects appearing before "including" or "including" include the elements or objects listed after "including" or "including" and their equivalents, and do not exclude other elements or objects. Similar terms, such as "coupled" or "connected," are not limited to physical or mechanical connections and may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are merely used to indicate relative positional relationships, and after the absolute position of the described object changes, the relative positional relationships may also change correspondingly.

[0031] Typically, when manufacturing a sheet-like composite layer, different layers may be laminated in multiple separate lamination operations. The sheet-like composite layer includes a carrier layer, a barrier layer, an inner cover layer, and an outer cover layer, of which the carrier layer is made of paper or paperboard, and the inner cover layer and outer cover layer are both made of thermoplastic film. During the manufacturing process, the barrier layer and inner cover layer are first laminated on one side of the carrier layer, and then the outer cover layer is laminated on the other side. To ensure sufficient adhesion between the barrier layer and the carrier layer, an adhesive layer may be applied between the barrier layer and the inner cover layer.

[0032] When the packaging container has an opening such as a straw hole or a guide hole, the carrier layer also has a corresponding opening. When the barrier layer and the adhesive layer are laminated on the edge of the opening of the carrier layer, the thickness of the carrier layer suddenly becomes thin, which makes it easy for the adhesive layer and the outer cover layer to be laminated and form a gap between them. This gap not only makes it difficult for the film layer at the opening to peel off, restricting the ease of opening the package, but also creates a large light-transmitting area, which affects the quality of the food in the packaging container.

[0033] Therefore, an embodiment of the present disclosure provides a sheet-like composite layer and a packaging sheet material. The sheet-like composite layer includes a carrier layer, a barrier layer, and an adhesive layer. The barrier layer is laminated on the carrier layer, and the adhesive layer is located between the carrier layer and the barrier layer and configured to bond the carrier layer to the barrier layer. The carrier layer has an opening, and the barrier layer and the adhesive layer extend along a plane in which the carrier layer is located and are configured to cover the opening. The carrier layer includes an edge surrounding the opening, and a gap portion is provided between the adhesive layer and the barrier layer in the thickness direction of the carrier layer, the gap portion being configured to extend along a portion of the edge.

[0034] If the gap extends along the entire edge and surrounds the opening, the separator at the opening will be difficult to peel off, making the package less easy to open. At the same time, because the gap is translucent, if it surrounds the opening, a large translucent area will be formed, which is unfavorable for long-term storage of the contents in the package, especially liquid foods such as milk and yogurt, and will likely cause the food to spoil.

[0035] Compared to when the gap extends along the entire edge and surrounds the opening, in the sheet-like composite layer of the above-described embodiment of the present invention, the gap extends along only part of the edge, thereby reducing the force required to separate the opening and improving the ease of opening the package, while also reducing the light-transmitting area, which is advantageous for long-term storage of the contents.

[0036] The present disclosure will be described below by means of several specific examples. In order to make the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and known components may be omitted. When any component of the embodiments of the present disclosure appears in more than one drawing, the component may be designated by the same reference numeral in each drawing.

[0037] Fig. 1 is a plan view schematic diagram of a packaging sheet material in an embodiment of the present disclosure. Fig. 2 is a locally enlarged schematic diagram of the packaging sheet material in Fig. 1. Fig. 2A is a cross-sectional schematic diagram along line AA in Fig. 2. Fig. 2B is a cross-sectional schematic diagram along line BB in Fig. 2.

[0038] As shown in FIG. 1, the packaging sheet material 100 provided in the embodiment of the present disclosure includes a folding pattern, and after being folded along the folding pattern, the packaging sheet material 100 can form a package container with a peaked top.

[0039] 1 is for schematic purposes only, and it is understood that the packaging sheet material 100 may have other folding patterns, such as a folding pattern that results in a flat top of the folded package, but the embodiments of the present disclosure are not limited thereto.

[0040] For example, the folding pattern may include a first fold line 101 and a second fold line 102, at least one of which extends along a second direction (e.g., the y-direction shown in the figures). The first fold line 101 and the second fold line 102 divide the packaging composite sheet material 100 into a first region T1, a second region T2, and a third region T3 distributed along the first direction (e.g., the x-direction shown in the figures).

[0041] 1, when the packaging sheet material 100 is folded, the first fold line 101 forms the top boundary of the package, and the second fold line 102 forms the bottom boundary of the package. Thus, the first region T1 defines the top of the container, the third region T3 defines the bottom of the package, and the second region T2 defines the side connecting the top and bottom of the package.

[0042] 1, the first fold line 101 may include, for example, a plurality of arc lines, which has the advantage of forming a curved top boundary, improving the aesthetic appearance of the product and preventing liquid from pooling on the inner wall of the top boundary when draining from the top. The second fold line 102 may be, for example, a straight line, which makes the bottom of the packaging container stronger.

[0043] It should be understood that the shapes of the first and second fold lines in the embodiments of the present disclosure are merely exemplary, and that the first fold line 101 may adopt other shapes, such as a straight line, and the second fold line may adopt other shapes, such as an arc, and that the embodiments of the present disclosure are not limited thereto.

[0044] The packaging sheet material 100 according to the embodiment of the present disclosure can be formed by cutting a continuous wide sheet-like composite layer. The sheet-like composite layer has a laminated structure as shown in Figures 2A and 2B. For example, the sheet-like composite layer includes a carrier layer 10, an adhesive layer 20, a barrier layer 30, an outer cover layer 40, and an inner cover layer 50, which are arranged in a laminated manner.

[0045] The carrier layer 10 serves as a support for the sheet-like composite layer as a main layer and can be made of a material such as paper or cardboard. As shown in Figures 1, 2A, and 2B, the carrier layer 10 may include an opening 11 formed in the first region T1. Providing the opening 11 in the carrier layer 10 is advantageous for forming a straw hole or guide hole covered with a separator in the final packaging container.

[0046] Figure 2 is a locally enlarged schematic diagram of the dashed rectangular area in Figure 1. As shown in Figures 2 and 2A, the carrier layer 10 has an edge 110 that defines an opening 11. The edge 110 surrounds the opening 11 on all four sides to define the area in which the opening 11 is located.

[0047] In the embodiment of the present disclosure, the planar shape of the opening 11 is circular, and in other embodiments, the planar shape of the opening 11 may be other geometric shapes such as rectangular, triangular, or diamond, and it can be understood that the embodiment of the present disclosure is not limited thereto.

[0048] As shown in FIGS. 2A and 2B, the openings 11 penetrate the carrier layer 10 along the thickness direction of the carrier layer 10 (eg, the z direction shown in the figures).

[0049] The barrier layer 30 is laminated on the carrier layer 10, and the adhesive layer 20 is positioned between the carrier layer 10 and the barrier layer 30 and configured to bond the carrier layer 10 and the barrier layer 30. That is, the adhesive layer 20 is positioned between the carrier layer 10 and the barrier layer 30 in the z-direction, thereby improving the robustness of the bond between them. In some embodiments, the adhesive layer 20 may further include a light-blocking material to prevent external light from entering the packaging container. For example, the adhesive layer may include a polymer layer (e.g., LDPE) having a color masterbatch distributed therein and a binder layer, and the polymer layer is bonded to the carrier layer 10 via the binder (e.g., ethylene acrylic acid copolymer (EAA)).

[0050] In embodiments of the present disclosure, the barrier layer 30 has moisture and oxygen barrier properties. In some embodiments, the barrier layer 30 may include an aluminum foil layer. In other embodiments, the barrier layer 30 may include a laminate structure that does not include any metal layers, which is more advantageous for recycling the packaging material and thereby reduces or even eliminates environmental damage caused by the packaging container.

[0051] For example, if barrier layer 30 does not include any metal layers, it may include a substrate layer and an additional layer disposed in a laminated manner. In Figure 2A, the substrate layer is located on one side of outer cover layer 50 facing adhesive layer 20, and the additional layer is located on one side of the substrate layer facing adhesive layer 20, i.e., between the substrate layer and adhesive layer 20.

[0052] The substrate layer may, for example, primarily comprise a polyolefin material, such as at least one of high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), and metallocene polyethylene (mPE).

[0053] The additional layer may be a single layer structure or a multi-layer structure, for example, a two-layer structure. A single layer structure allows the number of layers in the barrier layer to be reduced. A two-layer or multi-layer structure facilitates actual production and further improves the moisture and oxygen blocking performance of the barrier layer.

[0054] For example, when the additional layer has a two-layer structure, one layer is polyvinyl alcohol, and the other layer includes at least one of a metal oxide and a non-metal oxide. For example, the metal oxide can be selected from a metal oxide suitable in the art to achieve a barrier effect against light, vapor, and / or gas. Preferably, the metal oxide is an oxide of aluminum, iron, copper, or titanium, and more preferably aluminum oxide. For example, the non-metal oxide can be selected from a non-metal oxide suitable in the art to achieve a barrier effect against light, vapor, and / or gas. For example, the non-metal oxide can be silicon oxide.

[0055] 2A and 2B, the barrier layer 30 and the adhesive layer 20 are configured to extend along the plane P on which the carrier layer 10 is located and cover the opening 11. That is, the barrier layer 30 and the adhesive layer 20 extend across the opening 11 to cover the opening 11. This makes it possible to prevent contaminants from entering through the opening 11 after the contents are filled into the packaging container.

[0056] 2, 2A, and 2B, the carrier layer 10 includes an edge 110 surrounding the opening 11, and a first gap G1 and a second gap G2 are provided between the adhesive layer 20 and the barrier layer 30 in the z-direction, the first gap G1 and the second gap G2 being configured to extend along a portion of the edge 110. The adhesive layer 20 and the barrier layer 30 are spaced apart from each other in the first gap G1 and the second gap G2, forming an air gap or cavity (also called an air trap) therebetween.

[0057] As can be seen from FIG. 2, each of the first gap G1 and the second gap G2 extends along only a portion of the edge 110, and does not extend along the entire edge 110, and therefore does not surround the opening 11 on all four sides.

[0058] As shown in FIG. 1, the first gap G1 and the second gap G2 are located in the first region T1, and therefore the first gap G1 and the second gap G2 are located at the top of the packaging container.

[0059] If the gap extends along the entire edge portion 110 and surrounds the opening 11, the separator at the opening 11 becomes difficult to peel off, reducing the ease of opening the package. At the same time, because the gap is translucent, surrounding the opening 11 creates a large translucent area, which is unfavorable for long-term storage of the contents in the packaging container, particularly liquid foods such as milk and yogurt, and is likely to cause deterioration of the food.

[0060] Compared to when the gaps extend along the entire edge portion 110 and surround the opening 11, in the embodiment of the present application, the first gap portion G1 and the second gap portion G2 each extend along only a portion of the edge portion 110, thereby reducing the force required to separate the opening and improving the ease of opening the package, while reducing the light-transmitting area and being advantageous for long-term storage of the contents.

[0061] 2 and 2A, the carrier layer 10 includes a sidewall 120 located at the edge 110, and the sidewall 120 includes a first sidewall 121 and a second sidewall 122 facing each other in the x-direction (as shown in the figures, the x-direction is parallel to the plane P on which the carrier layer 10 is located). The first gap G1 and the second gap G2 are spaced apart in the x-direction, and the first gap G1 is configured to extend along a portion of the first sidewall 121, and the second gap G2 is configured to extend along a portion of the second sidewall 122.

[0062] Because the carrier layer 30 provides a support function, the thickness of the carrier layer 30 is greater than the thicknesses of the barrier layer 30 and the adhesive layer 30. Therefore, the carrier layer 10 has side walls formed at the edge 110. The first gap G1 is provided to extend along a portion of the first side wall 121, and the second gap G2 is provided to extend along a portion of the second side wall 122. This makes it possible to provide a space that can accommodate the first gap G1 and the second gap G2 without changing the material and structure of an existing packaging sheet material, thereby reducing the force required to partition the opening and improving the ease of opening the package.

[0063] 2, the first gap G1 and the second gap G2 are not connected to each other, that is, the first gap G1 and the second gap G2 do not communicate with each other.

[0064] In the embodiment of the present disclosure, the first gap G1 and the second gap G2 are formed by deformation of the adhesive layer 20 during the film formation process (e.g., after melt extrusion lamination). When the first gap G1 and the second gap G2 are connected to each other, the adhesive layer 20 is pulled to a large extent, and the volume of the air gap or cavity formed between the adhesive layer 20 and the barrier layer 30 is large. When the adhesive layer 20 contains a light-blocking material such as a color masterbatch, such a large tension is detrimental to the uniform distribution of the color masterbatch, and the light-blocking performance of the adhesive layer 20 is likely to be reduced.

[0065] In the embodiment of the present application, the first gap portion G1 and the second gap portion G2 are not connected to each other, thereby reducing the volume of the cavity, and thereby alleviating to some extent the problem of light transmission caused by uneven distribution of the light-shielding material due to tension of the adhesive layer during the cavity formation process.

[0066] As shown in FIG. 2, the first gap G1 may include a first end G11 and a second end G12 that face each other in the y direction (the y direction is parallel to the plane P on which the carrier layer 10 is located and perpendicular to the x direction). The second gap G2 includes a third end G21 and a fourth end G22 that face each other in the y direction. The first end G11 and the third end G21 are spaced apart in the x direction, and the second end G12 and the fourth end G22 are spaced apart in the x direction. This further ensures that the first gap G1 and the second gap G2 are not connected to each other.

[0067] 2A and 2B, outer cover layer 40 is laminated to carrier layer 10 and is located on the side of carrier layer 10 opposite adhesive layer 20 and barrier layer 30. For example, adhesive layer 20 and barrier layer 90 are located on a first side (the bottom side as shown in the figures) of carrier layer 10, and outer cover layer 4 is located on a second side (the top side as shown in the figures) of carrier layer 10. Outer cover layer 40 is configured to extend and cover opening 11, and outer cover layer 40 is adhered to adhesive layer 20 within opening 11. Outer cover layer 40.

[0068] In manufacturing the sheet-like composite layer, an outer cover layer may be provided in addition to the carrier layer 10, adhesive layer 20, and barrier layer 30 to improve the sealing effect at the opening 11, while also being used to form a colored or patterned layer for the package. In some embodiments, the outer cover layer comprises a polymeric material, such as polyethylene.

[0069] As shown in FIGS. 2A and 2B, an edge gap 130 is formed between the carrier layer 10, the adhesive layer 20, and the outer cover layer 40, and the first gap portion G1 and the second gap portion G2 are both located in the edge gap 130.

[0070] In the embodiment of the present disclosure, the formation of the edge gap 130 is related to the thickness of the carrier layer 10. When the outer cover layer 40 is laminated on top of the carrier layer 10, the carrier layer 10 is affected by stress and becomes thinner, but the carrier layer 10 itself has a certain repulsive force. After the carrier layer repulses, an edge gap 130 is formed between the side wall 120 of the carrier layer 10, the outer cover layer 40 and the adhesive layer 20, and the edge gap 130 appropriately provides accommodation space for the first gap portion G1 and the second gap portion G2.

[0071] As described above, the carrier layer 10 includes a sidewall 120 located at the edge 110, and the sidewall 120 extends along the entire edge 110 of the carrier layer 10, so that the edge gap 130 also extends along the entire edge 110 of the carrier layer 30. This is more advantageous in providing an accommodation space in the first gap G1 and the second gap G2.

[0072] As shown in FIG. 2A, for example, the edge gap 130 includes a first gap portion 131 and a second gap portion 132 that face each other in the x-direction, and the first gap portion 131 accommodates the first gap portion G1, and the second gap portion 132 accommodates the second gap portion G2.

[0073] As shown in FIG. 2B, for example, the edge gap 130 further includes a third gap portion 133 and a fourth gap portion 134 that face each other in the y direction, and the first gap portion 131, the second gap portion 132, the third gap portion 133, and the fourth gap portion 134 are connected at both ends to form the edge gap 130.

[0074] In the embodiment of the present disclosure, the first gap G1 and the second gap G2 are not provided in either the third gap portion 133 or the fourth gap portion 134, that is, no gap is provided in either the third gap portion 133 or the fourth gap portion 134. The advantage of doing so is that by avoiding the formation of an excessively large cavity, it is possible to alleviate the problem of light transmission caused by uneven distribution of the light-blocking material due to tension in the adhesive layer during the cavity formation process.

[0075] 2A , the first gap G1 and the second gap G2 include protrusions provided on the adhesive layer 20, and in the z direction, the protrusions protrude in a direction away from the barrier layer 30, that is, protrude outward from the sheet-like composite layer 100. However, the gaps in the embodiments of the present disclosure are not limited to this form, and a portion of the gap may protrude outward from the sheet-like composite layer 100, and another portion may protrude inward from the sheet-like composite layer 100.

[0076] In the embodiment of the present disclosure, the first gap portion G1 and the second gap portion G2 protrude in a direction away from the barrier layer 30, which is advantageous for the first gap portion G1 and the second gap portion G2 to be formed in the edge gap 130, thereby sufficiently improving the utilization rate of the edge gap.

[0077] In the embodiment of the present disclosure, the orthogonal projections of the first gap G1 and the second gap G2 on the plane P on which the carrier layer 10 is located are located at the opening 11. This does not affect the performance of the composite layer in the peripheral portion of the opening 11.

[0078] 2A, the inner cover layer 50 is positioned on the opposite side of the barrier layer 30 from the outer cover layer 40, e.g., the inner cover layer 50 is positioned below the barrier layer 30 and serves to seal or encapsulate the barrier layer 30. In some embodiments, the inner cover layer 50 comprises a polymeric material, such as polyethylene.

[0079] In the embodiments of the present disclosure, the first gap G1 and the second gap G2 may be distributed symmetrically or asymmetrically as shown in Figure 1. Furthermore, the sizes of the first gap G1 and the second gap G2 may be the same or different, and the embodiments of the present disclosure are not limited thereto.

[0080] The following description will be given taking as an example a case where the first gap G1 and the second gap G2 have the same structure and size. It will be understood that the following description may be applied to either the first gap G1 or the second gap G2.

[0081] As shown in FIG. 2, each of the first gap portion G1 and the second gap portion G2 has a first size t1 along the x direction and a second size t2 along the y direction, and the second size t2 is larger than the first size t1. For example, the second size t2 is 1.2 to 5 times the first size t1. With the above arrangement, since it is advantageous to increase the ratio of the length to the width of the first gap portion G1 and the second gap portion G2, it becomes easier to form gap portions in the narrow edge gap 130.

[0082] As shown in FIG. 2, the opening 11 has an opening size along the y direction, and the second size t2 of each of the first gap portion G1 and the second gap portion G2 is smaller than the opening size of the opening 11. By doing so, it is possible to avoid the first gap portion G1 and the second gap portion G2 being connected to each other, and it is also possible to reduce the volume of the cavity.

[0083] As shown in FIG. 2, the planar shape of the opening 11 is, for example, circular, the opening size is the diameter d of the circle, and the second size t2 of each of the first gap portion G1 and the second gap portion G2 is, for example, the length L, where the length L and the diameter d satisfy 0.1d ≦ L < d. That is, by the length L being 0.1 times or more and less than the diameter d of the diameter d, it is possible to further ensure that the first gap portion G1 and the second gap portion G2 are not connected. For example, the opening size of the opening 11 is 15 μm to 29 μm, and the length L is 2 μm to 14 μm.

[0084] As shown in FIG. 2A, each of the first gap portion G1 and the second gap portion G2 has a cross section along the z direction, and the opening 11 has a center line O1O2 along the x direction. In the y direction, the area S of the cross section is set to gradually decrease in the direction away from the center line O1O2. That is, the cross section of the first gap portion G1 has the smallest area at its first end G11 and second end G12, and the largest area at the position intersecting the center line O1O2.

[0085] Compared to when the cross-sectional area is the same in the y direction, this arrangement allows the area of ​​the light-transmitting region to be further reduced, which is advantageous for storing the contents.

[0086] 2 and 2A, the first size t1 of each of the first gap G1 and the second gap G2 is, for example, a width w, and each of the first gap G1 and the second gap G2 has a third size t3 along the z direction, for example, a height h. In the y direction, at least one of the height h and the width w is set to gradually decrease in the direction away from the center line O1O2.

[0087] As shown in Figures 2A and 2B, in some embodiments, the height h remains constant and the width w gradually decreases in the direction away from the center line O1O2, and in other embodiments, the width w remains constant and the height h gradually decreases in the direction away from the center line O1O2, either of which can achieve the above-mentioned objectives of the present application.

[0088] In some embodiments, the height h is equal to or less than half the thickness of the carrier layer 10. For example, the thickness of the carrier layer 10 is 400 to 800 μm, and the height h is 150 to 200 μm.

[0089] For example, the width w is 150 to 200 μm.

[0090] 2, the first gap G1 and the second gap G2 each have a crescent shape in a plane P parallel to the carrier layer 30. This is advantageous in that the cross section of each of the first gap G1 and the second gap G2 gradually decreases in the direction away from the center line O1O2.

[0091] In the sheet-like composite layer and packaging sheet material according to the embodiments of the present application, the gap portion extends only along a portion of the edge, thereby reducing the force required to separate the opening, thereby improving the ease of opening the package while reducing the light-transmitting area, which is advantageous for long-term storage of the contents.

[0092] In this specification, the following points should be noted.

[0093] (1) The drawings of the embodiments of the present disclosure only relate to the structures of the embodiments of the present disclosure, and other structures may refer to conventional designs.

[0094] (2) Unless inconsistent, the embodiments and features of the embodiments of this disclosure may be combined with each other to obtain new embodiments.

[0095] The above are merely exemplary embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure, which is defined by the appended claims.

[0096] The present disclosure may also include the following examples or illustrations.

[0097] (1) Career layer and a barrier layer laminated to the carrier layer; an adhesive layer located between the carrier layer and the barrier layer and configured to bond the carrier layer and the barrier layer, the carrier layer has an opening, and the barrier layer and the adhesive layer are configured to extend along a plane in which the carrier layer is located and cover the opening; the carrier layer includes an edge surrounding the opening; a gap portion is provided between the adhesive layer and the barrier layer in a thickness direction of the carrier layer, the gap portion being configured to extend along a portion of the edge; Sheet-like composite layer.

[0098] (2) the carrier layer includes a sidewall located at the edge, the sidewall including a first sidewall and a second sidewall facing each other in a first direction parallel to a plane in which the carrier layer is located; the gap portion includes a first gap portion and a second gap portion that are spaced apart from each other in the first direction, The sheet-like composite layer described in (1), wherein the first gap portion is configured to extend along a portion of the first side wall, and the second gap portion is configured to extend along a portion of the second side wall.

[0099] (3) The sheet-like composite layer according to (2), wherein the first gap portion and the second gap portion are not connected to each other.

[0100] (4) the first gap portion includes a first end and a second end facing each other in a second direction, the second direction being parallel to a plane in which the carrier layer is located and perpendicular to the first direction; the second gap portion includes a third end and a fourth end facing each other in the second direction, The sheet-like composite layer according to (3), wherein the first end and the third end are spaced apart from each other in the first direction, and the second end and the fourth end are spaced apart from each other in the first direction.

[0101] (5) further comprising an outer cover layer laminated to the carrier layer and positioned on the opposite side of the carrier layer from the adhesive layer and the barrier layer; The sheet-like composite layer according to any one of (1) to (4), wherein the outer cover layer is configured to extend and cover the opening, and the outer cover layer is adhered to the adhesive layer at the opening.

[0102] (6) an edge gap is defined between the carrier layer, the adhesive layer, and the outer cover layer; The sheet-like composite layer according to (5), wherein the gap is located in the edge gap.

[0103] (7) the carrier layer includes a sidewall located at the edge; The sheet-like composite layer according to (6), wherein the sidewall extends along the entire edge of the carrier layer, such that the edge gap extends along the entire edge of the carrier layer.

[0104] (8) The gap portion includes a first gap portion and a second gap portion that are spaced apart from each other in the first direction, the edge gap includes a first gap portion and a second gap portion facing each other in the first direction, The sheet-like composite layer according to (7), wherein the first gap portion is located in the first gap portion, and the second gap portion is located in the second gap portion.

[0105] (9) The edge gap further includes a third gap portion and a fourth gap portion facing each other in the second direction, the first gap portion, the second gap portion, the third gap portion, and the fourth gap portion have opposite ends connected to each other to form the edge gap; The sheet-like composite layer according to (8), wherein the first gap portion and the second gap portion are not provided in either the third gap portion or the fourth gap portion.

[0106] (10) The first gap portion and the second gap portion include protrusions provided on the adhesive layer, The composite layer sheet according to any one of (2) to (9), wherein the protrusions protrude in a thickness direction of the carrier layer in a direction away from the barrier layer.

[0107] (11) At least one of the first gap portion and the second gap portion has a first size along the first direction and a second size along the second direction, the second direction is parallel to a plane in which the carrier layer is located and perpendicular to the first direction; The sheet-like composite layer according to any one of (2) to (9), wherein the second size is larger than the first size.

[0108] (12) The opening has an opening size along the second direction, The sheet-like composite layer according to (11), wherein at least one of the second sizes of the first gap portion and the second gap portion is smaller than the opening size of the opening.

[0109] (13) The planar shape of the opening is circular, the opening size is the diameter d of the circle, and at least one of the second sizes of the first gap portion and the second gap portion is the length L, The sheet-like composite layer according to (12), wherein 0.1d ≦ L < d.

[0110] (14) At least one of the first gap portion and the second gap portion has a cross section along the thickness direction of the carrier layer, and the opening has a center line along a first direction, The sheet-like composite layer according to (11), wherein in the second direction, the area of the cross section is set to gradually decrease in a direction away from the center line.

[0111] (15) The first size of at least one of the first gap portion and the second gap portion is the width, [[ID=一十七]] At least one of the first gap portion and the second gap portion has a third size along a third direction, the third size is the height, and the third direction is perpendicular to the plane in which the carrier layer is located, The sheet-like composite layer according to (14), wherein in the second direction, at least one of the height and the width is set to gradually decrease in a direction away from the center line.

[0112] (16) The height is not more than one half of the thickness of the carrier layer, the sheet-like composite layer according to (15).

[0113] (17) The opening size of the opening is 15 to 29 mm, The width is 150 to 200 μm, The height is 150 to 200 μm, the sheet-like composite layer according to (15).

[0114] (18) The sheet-like composite layer according to (11), wherein at least one of the first gap portion and the second gap portion has a crescent shape in a plane parallel to the plane on which the carrier layer is located.

[0115] (19) The sheet-like composite layer according to any one of (1) to (18), wherein the barrier layer includes or does not include a metal layer.

[0116] (20) A packaging sheet material comprising the sheet-like composite layer according to any one of (1) to (19).

[0117] (21) The packaging sheet material includes a folding pattern; the folding pattern includes a first fold line and a second fold line; At least one of the first fold line and the second fold line extends along a second direction; the first folding line and the second folding line divide the composite packaging sheet material into a first region, a second region, and a third region distributed along a first direction; the first direction and the second direction are both parallel to a plane in which the carrier layer is located and perpendicular to each other; The packaging sheet material according to (20), wherein the opening and the gap are both located in the first region.

[0118] (22) The packaging sheet material is configured to be folded along the folding pattern to form a packaging container, the first region defines a top of the packaging container; the third region defines a bottom of the packaging container; the gap portion includes a first gap portion and a second gap portion spaced apart from each other in a first direction, The packaging sheet material according to (21), wherein the first gap and the second gap are located at the top of the packaging container.

[0119] In this specification, the following points should be noted.

[0120] (1) The drawings of the embodiments of the present disclosure only relate to the structures of the embodiments of the present disclosure, and other structures may refer to conventional designs.

[0121] (2) Unless inconsistent, the embodiments and features of the embodiments of this disclosure may be combined with each other to obtain new embodiments.

[0122] The above are merely exemplary embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure, which is defined by the appended claims.

Claims

1. The carrier layer and a barrier layer laminated to the carrier layer; an adhesive layer located between the carrier layer and the barrier layer and configured to bond the carrier layer and the barrier layer, the carrier layer has an opening, and the barrier layer and the adhesive layer are configured to extend along a plane in which the carrier layer is located and cover the opening; the carrier layer includes an edge surrounding the opening; a gap portion is provided between the adhesive layer and the barrier layer in a thickness direction of the carrier layer, the gap portion being configured to extend along a portion of the edge; Sheet-like composite layer.

2. the carrier layer includes a sidewall located at the edge, the sidewall including a first sidewall and a second sidewall facing each other in a first direction parallel to a plane in which the carrier layer is located; the gap portion includes a first gap portion and a second gap portion that are spaced apart from each other in the first direction, The first gap is configured to extend along a portion of the first side wall, and the second gap is configured to extend along a portion of the second side wall. The composite layer sheet according to claim 1 .

3. The first gap portion and the second gap portion are not connected to each other. The composite layer sheet according to claim 2 .

4. the first gap portion includes a first end and a second end facing each other in a second direction, the second direction being parallel to a plane in which the carrier layer is located and perpendicular to the first direction; the second gap portion includes a third end and a fourth end facing each other in the second direction, the first end and the third end are spaced apart from each other in the first direction, and the second end and the fourth end are spaced apart from each other in the first direction; The composite layer sheet according to claim 3 .

5. an outer cover layer laminated to the carrier layer and positioned on the opposite side of the carrier layer from the adhesive layer and the barrier layer; the outer cover layer is configured to extend and cover the opening, and the outer cover layer is adhered to the adhesive layer at the opening. The sheet-like composite layer according to any one of claims 1 to 4.

6. an edge gap defined between the carrier layer, the adhesive layer, and the outer cover layer; The gap portion is located in the edge gap. The composite layer sheet according to claim 5 .

7. the carrier layer includes a sidewall located at the edge; the sidewall extends along the entire edge of the carrier layer, such that the edge gap extends along the entire edge of the carrier layer. The composite layer sheet according to claim 6 .

8. the gap portion includes a first gap portion and a second gap portion that are spaced apart from each other in the first direction, the edge gap includes a first gap portion and a second gap portion facing each other in the first direction, The first gap portion is located in the first gap portion, and the second gap portion is located in the second gap portion. The sheet-like composite layer according to claim 7 .

9. the edge gap further includes a third gap portion and a fourth gap portion facing each other in the second direction, the first gap portion, the second gap portion, the third gap portion, and the fourth gap portion have opposite ends connected to each other to form the edge gap; The first gap portion and the second gap portion are not provided in either the third gap portion or the fourth gap portion. The composite layer sheet according to claim 8 .

10. the first gap portion and the second gap portion include protrusions provided on the adhesive layer, the protrusions protrude in a thickness direction of the carrier layer in a direction away from the barrier layer; The sheet-like composite layer according to any one of claims 2 to 9.

11. At least one of the first gap portion and the second gap portion has a first size along the first direction and a second size along the second direction; the second direction is parallel to a plane in which the carrier layer is located and perpendicular to the first direction; The second size is larger than the first size. The sheet-like composite layer according to any one of claims 2 to 9.

12. the opening has an opening size along the second direction, the second size of the at least one of the first gap portion and the second gap portion is smaller than the opening size of the opening; The sheet-like composite layer according to claim 11.

13. The planar shape of the opening is circular, the opening size is a diameter d of the circle, and the second size of at least one of the first gap portion and the second gap portion is a length L, 0.1d≦L<d; The composite layer sheet according to claim 12.

14. the at least one of the first gap portion and the second gap portion has a cross section along a thickness direction of the carrier layer, and the opening has a center line along a first direction; In the second direction, the area of ​​the transverse cross section is set to gradually decrease in a direction away from the center line. The sheet-like composite layer according to claim 11.

15. the first size of the at least one of the first gap portion and the second gap portion is a width; the at least one of the first gap portion and the second gap portion has a third size along a third direction, the third size being a height, and the third direction being perpendicular to a plane in which the carrier layer lies; In the second direction, at least one of the height and the width is set to gradually decrease in a direction away from the center line. The composite layer in sheet form according to claim 14.

16. the height is equal to or less than half the thickness of the carrier layer; The composite layer sheet according to claim 15.

17. The opening size of the opening is 15 to 29 mm, the width is 150 to 200 μm, The height is 150 to 200 μm. The composite layer sheet according to claim 15.

18. At least one of the first gap portion and the second gap portion has a crescent shape in a plane parallel to a plane on which the carrier layer is located. The sheet-like composite layer according to claim 11.

19. The barrier layer may or may not include a metal layer. The sheet-like composite layer according to any one of claims 1 to 18.

20. A sheet-like composite layer according to any one of claims 1 to 19, Packaging sheet material.

21. the packaging sheet material includes a folding pattern; the folding pattern includes a first fold line and a second fold line; At least one of the first fold line and the second fold line extends along a second direction; the first folding line and the second folding line divide the composite packaging sheet material into a first region, a second region, and a third region distributed along a first direction; the first direction and the second direction are both parallel to a plane in which the carrier layer is located and perpendicular to each other; The opening and the gap are both located in the first region.

21. The packaging sheet material according to claim 20.

22. the packaging sheet material is configured to be folded along the folding pattern to form a packaging container; the first region defines a top of the package; the third region defines a bottom of the packaging container; the gap portion includes a first gap portion and a second gap portion spaced apart from each other in a first direction, The first gap and the second gap are located at the top of the packaging container.

22. The packaging sheet material according to claim 21.

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