A light-proof and moisture-proof packaging bag for tea leaves

Abstract

The utility model discloses a kind of light-shielding moisture-proof packaging bags for tea, it is related to tea packaging bag technical field, including the bag body with bag cavity;Bag body and its bag layer are by inner layer, light-shielding moisture-proof layer, middle layer and outer layer sequentially laminated fixed from inside to outside;Bag body has heat sealing end;The inner layer, middle layer and outer layer extend outward at heat sealing end and the extension part of this inner layer, middle layer and outer layer sequentially heat lamination;The material of inner layer and middle layer is same;The utility model has advantages that: by lengthening at inner layer, middle layer and outer layer away from heat sealing end again and carrying out heat sealing treatment to this part simultaneously when heat pressing, to increase airtight surface and improve connection strength;Light-shielding moisture-proof layer is simultaneously built-in to reduce interlayer peeling surface;The material of inner layer and middle layer is same, to improve the compatibility when heat sealing, reduce interlayer peeling possibility, strengthen sealing strength.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag technology, and more specifically to a light-proof and moisture-proof packaging bag for tea. Background Technology

[0002] Tea is a commodity that is very sensitive to environmental conditions. Proper packaging is crucial to maintaining its quality. It is necessary to use light-proof and moisture-proof packaging bags to store tea, which can effectively protect tea from light, moisture and odors, thereby helping to maintain the freshness and aroma of tea. The existing tea packaging bag, as shown in application number CN202322960592.9, "A Sealed and Moisture-proof Tea Packaging Paper Bag", has heat-sealed ends on opposite sides and uses "protective layer, outer barrier layer, kraft paper layer, inner barrier layer and inner surface layer" as a protective structure, which can provide the effect of light blocking and moisture protection. However, the heat-sealing of this packaging bag only involves a relative fit and seal on the inner surface, resulting in insufficient sealing strength. Utility Model Content

[0003] The purpose of this utility model is to provide a light-proof and moisture-proof packaging bag for tea in order to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, this utility model specifically adopts the following technical solution: This utility model proposes a light-proof and moisture-proof packaging bag for tea, comprising: A bag with a cavity; The bag body and its layers are sequentially bonded and fixed from the inside out, consisting of an inner layer, a light-proof and moisture-proof layer, a middle layer, and an outer layer. The bag body has a heat-sealed end; The feature is that the inner layer, the middle layer and the outer layer extend outward at the heat-sealing end and the extended portions of the inner layer, the middle layer and the outer layer are sequentially heat-bonded; The inner and middle layers are made of the same material.

[0005] As a preferred embodiment of this invention, the melting point of the inner layer is lower than that of the middle layer.

[0006] As a preferred embodiment of this utility model, the inner layer is composed of multiple sets of polyethylene layers, which are sequentially bonded and fixed from the inside to the outside, and their melting points increase sequentially.

[0007] As a preferred technical solution of this utility model, the light-shielding and moisture-proof layer includes: An aluminum foil layer, wherein the inner side of the aluminum foil layer is bonded and fixed to the inner layer; A nano-silica coating is provided, wherein the outer side of the nano-silica coating is bonded and fixed to the middle layer, and the nano-silica coating is fixed to the outer side of the aluminum foil layer.

[0008] As a preferred embodiment of this utility model, the outer layer includes; A PET material layer, wherein the inner side of the PET material layer is bonded and fixed to the intermediate layer; A UV-curable resin coating is applied to the outside of the PET material layer.

[0009] In a preferred embodiment of this invention, the intermediate layer is made of polyethylene.

[0010] The beneficial effects of this utility model are as follows: By extending the inner, middle, and outer layers further away from the heat-sealing end and simultaneously heat-sealing this part during hot pressing, the sealing surface is increased and the connection strength is improved; at the same time, a light-shielding and moisture-proof layer is built in to reduce the peeling surface between layers; the inner and middle layers are made of the same material to improve the compatibility during heat sealing, thereby reducing the possibility of interlayer peeling and strengthening the sealing strength. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure reference numerals: Bag body-A, Inner layer-1, Light-proof and moisture-proof layer-2, Middle layer-3, Outer layer-4, Aluminum foil layer-21, Nano silica coating-22, PET material layer-41, UV-cured resin coating-42. Detailed Implementation

[0013] like Figure 1 As shown, this utility model proposes: a light-proof and moisture-proof packaging bag for tea, comprising; A bag A with a cavity; the cavity serves as a space for holding tea. Bag A is attached and fixed in sequence from the inside out through inner layer 1, light-proof and moisture-proof layer 2, middle layer 3 and outer layer 4; Bag A has a heat-sealed end; the left and right ends of bag A are heat-sealed to form a bag cavity, and this heat-sealing position is used as the heat-sealed end; The inner layer 1, the middle layer 3, and the outer layer 4 extend outward at the heat-sealing end, and the extended portions of the inner layer 1, the middle layer 3, and the outer layer 4 are sequentially heat-bonded; a short section is extended at both ends of the inner layer 1, the middle layer 3, and the outer layer 4, and this section is simultaneously heat-sealed during hot pressing to increase the sealing surface and improve the connection strength; at the same time, the light-shielding and moisture-proof layer 2 is built in to reduce the peeling surface between layers; The inner layer 1 and the middle layer 3 are made of the same material; this can improve the compatibility during phase heat sealing, reduce the possibility of interlayer delamination, and enhance the sealing performance.

[0014] The inner layer 1 has a lower melting point than the middle layer 3. During heat sealing, the inner layer 1 melts to form a preliminary seal. Subsequently, as the temperature rises, the middle layer 3 also begins to soften but does not completely melt, thereby enhancing the sealing strength.

[0015] The inner layer 1 is composed of multiple polyethylene layers, which are sequentially bonded and fixed from the inside out with increasing melting points. Polyethylene (PE) has good heat-sealing properties and strong moisture resistance. When heat-sealing is performed, the innermost polyethylene layer (the one in direct contact with the tea leaves) will melt first due to its lower melting point and play a preliminary sealing role. As the temperature rises further, the outermost polyethylene layers will gradually soften and participate in the sealing process. This ensures a good melting and sealing effect even under less than ideal heating conditions (such as insufficient heating uniformity).

[0016] The material of the middle layer 3 is polyethylene; Among them, the light-shielding and moisture-proof layer 2 includes; Aluminum foil layer 21, the inner side of which is bonded and fixed to inner layer 1 (i.e., the outermost polyethylene layer in inner layer 1); The nano-silica coating 22 is bonded and fixed to the outer side of the intermediate layer 3, and is fixed to the outer side of the aluminum foil layer 21. The nano-silica coating 22 can be formed on the outer side of the aluminum foil layer 21 by spraying or other methods. The aluminum foil layer 21 mentioned above can serve as a light shield to prevent light from directly shining on the tea leaves and causing a decline in quality; while the nano-silica coating 22 can further improve water resistance and effectively enhance the blocking of moisture.

[0017] The outer layer 4 includes: PET material layer 41, the inner side of which is bonded and fixed to the intermediate layer 3; UV-curable resin coating 42 is disposed on the outside of PET material layer 41; UV-curable resin coating 42 can be formed on the outside of PET material layer 41 by spraying or coating. The PET (polyethylene terephthalate) material layer 41 provides additional physical protection against external impacts; the UV-cured resin coating 42 increases surface hardness and abrasion resistance, while also providing some UV protection for the internal materials. Based on the above, the inner layer 1 and the light-shielding and moisture-proof layer 2 can be bonded and fixed by means of adhesive (hot melt adhesive); the light-shielding and moisture-proof layer 2 and the middle layer 3 can be tightly connected by means of heat sealing or adhesive (hot melt adhesive); the middle layer 3 and the outer layer 4 can be tightly connected by means of adhesive (two-component polyurethane adhesive).

[0018] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A light-proof and moisture-proof packaging bag for tea, comprising: A bag with a cavity (A); The bag body (A) and its bag layers are sequentially bonded and fixed from the inside out through the inner layer (1), the light-proof and moisture-proof layer (2), the middle layer (3) and the outer layer (4); The bag body (A) has a heat-sealed end; Its features are, The inner layer (1), the middle layer (3) and the outer layer (4) extend outward at the heat-sealing end and the extended portions of the inner layer (1), the middle layer (3) and the outer layer (4) are heat-bonded in sequence; The inner layer (1) and the middle layer (3) are made of the same material.

2. The light-proof and moisture-proof packaging bag for tea according to claim 1, characterized in that, The melting point of the inner layer (1) is lower than that of the middle layer (3).

3. The light-proof and moisture-proof packaging bag for tea according to claim 1, characterized in that, The inner layer (1) is composed of multiple polyethylene layers, which are bonded and fixed from the inside to the outside and their melting points increase sequentially.

4. The light-proof and moisture-proof packaging bag for tea according to claim 1, characterized in that, The light-shielding and moisture-proof layer (2) includes; An aluminum foil layer (21) is attached and fixed to the inner layer (1) on its inner side; The nano-silica coating (22) is attached and fixed to the outer side of the intermediate layer (3) and fixed to the outer side of the aluminum foil layer (21).

5. The light-proof and moisture-proof packaging bag for tea according to claim 1, characterized in that, The outer layer (4) includes; PET material layer (41), the inner side of which is bonded and fixed to the intermediate layer (3); UV-curable resin coating (42) is disposed on the outside of PET material layer (41).

6. The light-proof and moisture-proof packaging bag for tea according to claim 1, characterized in that, The intermediate layer (3) is made of polyethylene.

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