Packaging bag with easy-to-tear opening and composite film for packaging bag

Abstract

The utility model provides an easy tear mouth packaging bag and its composite membrane, including the composite membrane body, the composite membrane body includes surface composite membrane layer and bottom surface heat seal membrane layer, the surface composite membrane layer is provided with a plurality of kerfs that are distributed in the line direction, the plurality of kerfs are distributed at intervals and form the easy tear line together, and the bottom surface heat seal membrane layer is provided with the bottom surface heat seal membrane layer. The surface composite film layer comprises a surface protection film layer and an aluminum foil shading layer which are attached to each other from top to bottom, and the bottom surface heat sealing film layer is attached to the bottom of the aluminum foil shading layer and covers the kerf, so that the composite film body can be torn along the track of the easy-to-tear line.

Description

Technical Field

[0001] The utility model relates to the technical field of composite films, in particular to an easy-tear packaging bag and a composite film used therefor. Background Art

[0002] At present, in the field of flexible packaging, the application of easy-tear composite film has been very extensive. However, to achieve the easy-tear effect, taking pharmaceutical flexible packaging bags as an example, there are certain limitations in the field of flexible packaging. Usually, an easy-tear notch is made on the edge of the packaging bag. The disadvantage of this is that the packaging bag cannot be torn in the required direction when tearing it open, and it is easy to be torn, resulting in the packaging bag not being fully opened. It needs to be torn a second time manually or with tools to take out the items in the bag. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes an easy-tear packaging bag and a composite film used therefor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A composite film for an easy-tear packaging bag comprises a composite film body, wherein the composite film body comprises a surface composite film layer and a bottom heat-sealing film layer, wherein the surface composite film layer is provided with a plurality of linearly arranged slits, wherein the plurality of slits are distributed at intervals and together constitute an easy-tear line, wherein the surface composite film layer comprises, from top to bottom, a surface protection film layer and an aluminum foil shading layer which are bonded to each other, and the bottom heat-sealing film layer is bonded to the bottom of the aluminum foil shading layer and covers the slits.

[0006] The surface protection film layer is a PET film with a thickness of 8μm-20μm; the thickness of the aluminum foil shading layer is 5μm-10μm; the bottom heat-sealing film layer is a PE film with a thickness of 30μm-70μm; the surface protection film layer and the aluminum foil shading layer, and the aluminum foil shading layer and the bottom heat-sealing film layer are respectively bonded by adhesive layers.

[0007] The thickness of the composite film body is 67 μm-96 μm; the surface protection film layer is a PET film with a thickness of 11 μm-13 μm; the thickness of the aluminum foil light-shielding layer is 6 μm-8 μm; and the bottom heat-sealing film layer is a PE film with a thickness of 45 μm-55 μm.

[0008] The two ends of the easy-tear line are respectively close to the two edges of the composite film body.

[0009] A packaging bag with an easy-tear opening comprises a packaging bag body, wherein composite film bodies are arranged on both sides of the packaging bag body, the composite film body comprises a surface composite film layer and a bottom heat-sealing film layer, the surface composite film layer is provided with a plurality of linearly arranged slits, the plurality of slits are distributed at intervals and together constitute an easy-tear line, the surface composite film layer comprises from top to bottom a surface protection film layer and an aluminum foil shading layer bonded to each other, the bottom heat-sealing film layer is bonded to the bottom of the aluminum foil shading layer and covers the slits; the composite film bodies on both sides are closed by hot-melt of the bottom heat-sealing film layer, and the easy-tear lines of the composite film bodies on both sides are arranged relatively to each other and are located on the outer wall of the storage cavity of the packaging bag body.

[0010] The two sides of the packaging bag body are formed by folding a composite film body in half, and the three sides of the composite film body except the folded edge are hot-melt closed; or, the two sides of the packaging bag body are two independent composite film bodies, and the four sides of the two independent composite film bodies are hot-melt closed.

[0011] The surface protection film layer is a PET film with a thickness of 8μm-20μm; the thickness of the aluminum foil shading layer is 5μm-10μm; the bottom heat-sealing film layer is a PE film with a thickness of 30μm-70μm; the surface protection film layer and the aluminum foil shading layer, and the aluminum foil shading layer and the bottom heat-sealing film layer are respectively bonded by adhesive layers.

[0012] The thickness of the composite film body is 67 μm-96 μm; the surface protection film layer is a PET film with a thickness of 11 μm-13 μm; the thickness of the aluminum foil light-shielding layer is 6 μm-8 μm; and the bottom heat-sealing film layer is a PE film with a thickness of 45 μm-55 μm.

[0013] The two ends of the easy-tear line are respectively close to the two edges of the packaging bag body.

[0014] The surface of the surface protection film layer is also provided with a pattern layer.

[0015] The utility model has the following beneficial effects:

[0016] 1. The composite film body comprises a surface composite film layer and a bottom heat-sealed film layer. The surface composite film layer is provided with a plurality of linearly arranged slits, which are spaced apart and together form an easy-tear line, so that the composite film body can be torn along the track of the easy-tear line.

[0017] 2. The two ends of the tear line are respectively close to the two edges of the composite film body, which can be two adjacent edges of the composite film body or two opposite edges, so that it can guide the user to tear it at the desired position.

[0018] 3. The packaging bag body can be combined in various ways. The two sides can be formed by folding a composite film body in half, and the edges of the opening are closed by hot melting; or the two sides can be formed by two independent composite film bodies overlapping each other, and the edges of the opening are closed by hot melting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The easy-tear line of the embodiment of the utility model is shown in FIG. Figure 1 .

[0020] Figure 2 For the utility model embodiment Figure 1 Cross-sectional view in cross-sectional direction.

[0021] Figure 3 This is a schematic diagram of a packaging bag formed by facing the composite films of an embodiment of the utility model.

[0022] Figure 4 The composite film of the embodiment of the utility model is used to form a packaging bag Figure 2 .

[0023] Figure 5 This is a cross-sectional view of a packaging bag formed by a composite film according to an embodiment of the utility model.

[0024] Figure 6 This is a schematic diagram of a packaging bag formed by overlapping composite films in an embodiment of the utility model.

[0025] Figure 7 The composite film of the embodiment of the utility model is overlapped to form a packaging bag Figure 2 .

[0026] Figure 8 This is a cross-sectional view of a packaging bag formed by overlapping composite films in an embodiment of the utility model.

[0027] Fig. 9 The easy-tear line of the embodiment of the utility model is shown in FIG. Figure 2 .

[0028] Reference numerals in the figure: composite film body 1, surface protection film layer 11, aluminum foil light shielding layer 12, bottom heat sealing film layer 13, adhesive 14;

[0029] Easy tear line 2, cutting seam 21;

[0030] The packaging bag body 3 includes a storage cavity 31 . DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1-Figure 9 As shown, a composite film for an easy-tear packaging bag includes a composite film body 1, which can be used to make food packaging bags, medical packaging bags, heat-sealed bottle cap films, etc. The composite film body 1 includes a surface composite film layer and a bottom heat-sealed film layer 13, and the surface composite film layer and the bottom hot air film layer 13 are bonded and fixed by an adhesive 14.

[0035] like Figure 1 , Fig. 9 As shown, in order to enable the surface composite film layer to be torn in a desired direction when being torn, a plurality of linearly arranged slits 21 are provided on the surface composite film layer, and the plurality of slits are distributed at intervals and together form an easy-tear line 2. When the surface composite film layer is torn, it can be torn along the easy-tear line 2, achieving an easy-tear effect and avoiding tearing of the surface composite film layer.

[0036] Specifically, Figure 2As shown, the surface composite film layer includes a surface protection film layer 11 and an aluminum foil shading layer 12 that are bonded to each other from top to bottom. The two are bonded and fixed by an adhesive 14 to form an easy-to-tear aluminum-plastic composite film. The bottom heat-sealing film layer 13 is bonded to the bottom of the aluminum foil shading layer 12 and covers the cut slit 21. The bottom hot air film layer 13 has a good sealing function. It is wrapped around the outer layer of the object to isolate the external atmosphere from entering, and it can also isolate the object from leaking out.

[0037] The thickness of the composite membrane body 1 is 67 μm-96 μm.

[0038] Specifically, the surface protection film layer 11 is a PET film, which is a biaxially stretched polyester film layer. Its thickness is 8 μm-20 μm. Preferably, its thickness is 11 μm-13 μm. More preferably, its thickness is 12 μm.

[0039] The aluminum foil light shielding layer 12 has a thickness of 5 μm-10 μm and is a highly elongated aluminum foil layer made by a rolling process. Preferably, its thickness is 6 μm-8 μm. More preferably, its thickness is 7 μm.

[0040] The bottom heat-sealing film layer 13 is a PE film with a thickness of 30 μm-70 μm, preferably 45 μm-55 μm, and more preferably 50 μm.

[0041] The two ends of the easy tear line 2 are respectively close to the two edges of the composite membrane body 1. Specifically, the two ends of the easy tear line 2 can be located at two adjacent edges of the composite membrane body 1, or at two opposite edges. When the two ends of the easy tear line 2 are located at two adjacent edges of the composite membrane body 1, the easy tear line 2 is connected to the two ends in an oblique line or an arc line (not shown in the figure), so that the composite membrane body 1 can be torn along the oblique line or the arc line. When the two ends of the easy tear line 2 are located on two opposite edges of the composite membrane body 1, the easy tear line 2 is connected to the two ends in a straight line or an arc line, so that the composite membrane body 1 can be torn along a straight line or an arc line.

[0042] The specific principle is that when tearing, the stress is concentrated at the position of the cut 21, that is, the position of the cut 21 breaks first, which plays an easy-tear role, so that the composite film body 1 is torn along the track of the easy-tear line 2.

[0043] like Figure 3-Figure 8As shown, an easy-tear packaging bag comprises a packaging bag body 3, and the packaging bag body 3 is made of the above-mentioned composite film body 1. The above-mentioned composite film body 1 is provided on both sides of the packaging bag body 3, and the composite film bodies 1 on both sides are heat-melted and closed by the bottom heat-sealing film layer 13, and the easy-tear lines 2 on the composite film bodies 1 on both sides are arranged oppositely and located on the outer wall of the storage cavity 31 of the packaging bag body 3. The composite film bodies 1 on both sides can be torn symmetrically along the easy-tear lines 2. In other words, the packaging bag body 3 can be torn along the easy-tear lines 2, so as to open the storage cavity 31.

[0044] Furthermore, the two sides of the packaging bag body 3 are formed by folding a composite film body 1 in half, and the three sides of the composite film body 1 on both sides are closed by heat-melting except for the folded edge. Alternatively, the two sides of the packaging bag body 3 are two independent composite film bodies 1, and the four sides of the two independent composite film bodies 1 are closed by heat-melting in a way of overlapping up and down. Specifically, the composite film layer is located on the outside of the packaging bag body 3, and the bottom hot air film layer 13 is located on the inside of the packaging bag body 3. Since the bottom hot air film layer 13 has sealing properties, it can well preserve the items in the storage cavity 31.

[0045] In this embodiment, the thickness of the composite membrane body 1 is 67 μm-96 μm.

[0046] Specifically, Figure 2 As shown, the surface protection film layer 11 is a PET film, which is a biaxially stretched polyester film layer. Its thickness is 8 μm-20 μm. Preferably, its thickness is 11 μm-13 μm. More preferably, its thickness is 12 μm.

[0047] The aluminum foil light shielding layer 12 has a thickness of 5 μm-10 μm and is a highly elongated aluminum foil layer made by a rolling process. Preferably, its thickness is 6 μm-8 μm. More preferably, its thickness is 7 μm.

[0048] The bottom heat-sealing film layer 13 is a PE film with a thickness of 30 μm-70 μm, preferably 45 μm-55 μm, and more preferably 50 μm.

[0049] The two ends of the easy tear line 2 are respectively close to the two edges of the composite film body 1. Specifically, the two ends of the easy tear line 2 can be located at two adjacent edges of the composite film body 1, or at two opposite edges. When the two ends of the easy tear line 2 are located at two adjacent edges of the composite film body 1, the easy tear line 2 is connected to the two ends in an oblique line or an arc, so that the composite film body 1 can be torn along the oblique line or the arc. When the two ends of the easy tear line 2 are located on two opposite edges of the composite film body 1, the easy tear line 2 is connected to the two ends in a straight line or an arc, so that the composite film body 1 can be torn along a straight line or an arc. Similarly, the easy tear lines 2 are symmetrically arranged on both sides of the packaging bag body 3, and the easy tear lines 2 cross the storage cavity 31, so that the packaging bag body 3 can be torn into the storage cavity 31 along the trajectory of the easy tear line 2, thereby opening the storage cavity 31 to take out items.

[0050] The specific principle is that when tearing, the stress is concentrated at the position of the cut 21, that is, the position of the cut 21 breaks first, which plays an easy-tear role, so that the composite film body 1 is torn along the track of the easy-tear line 2.

[0051] Furthermore, the surface of the surface protection film layer 11 is also provided with a pattern layer (not shown in the figure), which can be used to print patterns, text information, etc. that are easy to identify.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention and on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A composite film for an easy-tear packaging bag, comprising a composite film body (1), characterized in that: The composite film body (1) comprises a surface composite film layer and a bottom heat-sealing film layer (13); the surface composite film layer is provided with a plurality of linearly arranged slits (21); the plurality of slits are spaced apart and together form an easy-tear line (2); the surface composite film layer comprises, from top to bottom, a surface protection film layer (11) and an aluminum foil light-shielding layer (12) bonded to each other; the bottom heat-sealing film layer (13) is bonded to the bottom of the aluminum foil light-shielding layer (12) and covers the slits (21).

2. The composite film for easy-tear packaging bag according to claim 1, characterized in that: The surface protection film layer (11) is a PET film with a thickness of 8 μm-20 μm; the aluminum foil light-shielding layer (12) has a thickness of 5 μm-10 μm; the bottom heat-sealing film layer (13) is a PE film with a thickness of 30 μm-70 μm; the surface protection film layer (11) and the aluminum foil light-shielding layer (12), and the aluminum foil light-shielding layer (12) and the bottom heat-sealing film layer (13) are respectively bonded via adhesive layers.

3. The composite film for easy-tear packaging bag according to claim 2, characterized in that: The composite film body (1) has a thickness of 67 μm-96 μm; the surface protection film layer (11) is a PET film with a thickness of 11 μm-13 μm; the aluminum foil light shielding layer (12) has a thickness of 6 μm-8 μm; and the bottom heat-sealing film layer (13) is a PE film with a thickness of 45 μm-55 μm.

4. The composite film for easy-tear packaging bag according to claim 1, characterized in that: The two ends of the easy-tear line (2) are respectively close to the two edges of the composite film body (1).

5. An easy-tear packaging bag, comprising a packaging bag body (3), with a composite film body (1) provided on both sides of the packaging bag body (3), characterized in that: The composite film body (1) comprises a surface composite film layer and a bottom heat-sealing film layer (13); the surface composite film layer is provided with a plurality of linearly arranged slits (21); the plurality of slits are spaced apart and together form an easy-tear line (2); the surface composite film layer comprises, from top to bottom, a surface protection film layer (11) and an aluminum foil light-shielding layer (12) bonded to each other; the bottom heat-sealing film layer (13) is bonded to the bottom of the aluminum foil light-shielding layer (12) and covers the slits (21); the composite film bodies (1) on both sides are closed by hot-melt bonding through the bottom heat-sealing film layer (13); the easy-tear lines (2) of the composite film bodies (1) on both sides are arranged opposite to each other and are located on the outer wall of the storage cavity (31) of the packaging bag body.

6. The easy-tear packaging bag according to claim 5, characterized in that: The two sides of the packaging bag body (3) are formed by folding a composite film body (1) in half, and the three sides of the composite film body (1) on both sides except the folded edge are closed by heat melting; or, the two sides of the packaging bag body (3) are two independent composite film bodies (1), and the four sides of the two independent composite film bodies (1) are closed by heat melting.

7. The easy-tear packaging bag according to any one of claims 5 or 6, characterized in that: The surface protection film layer (11) is a PET film with a thickness of 8 μm-20 μm; the aluminum foil light-shielding layer (12) has a thickness of 5 μm-10 μm; the bottom heat-sealing film layer (13) is a PE film with a thickness of 30 μm-70 μm; the surface protection film layer (11) and the aluminum foil light-shielding layer (12), and the aluminum foil light-shielding layer (12) and the bottom heat-sealing film layer (13) are respectively bonded via adhesive layers.

8. The easy-tear packaging bag according to claim 7, characterized in that: The composite film body (1) has a thickness of 67 μm-96 μm; the surface protection film layer (11) is a PET film with a thickness of 11 μm-13 μm; the aluminum foil light shielding layer (12) has a thickness of 6 μm-8 μm; and the bottom heat-sealing film layer (13) is a PE film with a thickness of 45 μm-55 μm.

9. The easy-tear packaging bag according to any one of claims 5 or 6, characterized in that: The two ends of the easy-tear line (2) are respectively close to the two edges of the packaging bag body (3).

10. The easy-tear packaging bag according to claim 5 or 6, characterized in that: The surface of the surface protection film layer (11) is also provided with a pattern layer.

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