Moisture-absorbing multi-layer co-extrusion film structure and moisture-absorbing packaging bag

Abstract

The moisture-absorbing multi-layer co-extrusion film structure sequentially comprises a blocking layer, a moisture-absorbing middle layer and a heat-sealing breathable inner layer from outside to inside, the blocking layer is connected with one side of the moisture-absorbing middle layer, and the heat-sealing breathable inner layer is connected with the other side of the moisture-absorbing middle layer; the barrier layer is an HDPE film layer, and the thickness of the barrier layer is 10-15 microns; the moisture absorption middle layer is a calcium oxide PE moisture absorption middle layer, and the thickness is 15-25 microns; the heat-sealing breathable inner layer is an LDPE film layer or an LLDPE film layer, and the thickness is 10-15 microns. The utility model further discloses a moisture-absorbing packaging bag which is formed by cutting and heat-sealing the moisture-absorbing multi-layer co-extrusion film. The moisture-absorbing multi-layer co-extrusion film with the structure can be used for manufacturing moisture-absorbing packaging bags of various foods, medicines and electronic products, the moisture-absorbing layer is integrated into the whole multi-layer co-extrusion film structure, moisture in the packaging bags can be effectively absorbed, moisture outside the packaging bags is prevented from entering the packaging bags, additional drying agent bags are not needed, the cost can be saved, the production efficiency can be optimized, and the production cost can be reduced. The packaging bag with the moisture absorption function, which is made of the packaging bag, avoids the leakage pollution risk caused by using a drying agent bag, and has reliability.

Description

Technical Field

[0001] The utility model belongs to the field of multi-layer co-extruded films for packaging, and in particular relates to a hygroscopic multi-layer co-extruded film structure and a hygroscopic packaging bag. Background Art

[0002] Desiccant bags are usually placed in packaging bags of food, medicine, and electronic products to control the humidity inside the bags. Desiccant bags can significantly reduce adverse effects such as deliquescence of food and medicine, failure of electronic equipment, etc., extend the shelf life of food and medicine, and maintain the performance and life of the equipment.

[0003] Existing desiccant packages are packaged as an integral part of the product in the form of independent small packages. Independently packaged desiccant has the risk of contaminating the entire product due to damage and leakage, so another form of moisture absorption and drying in the packaging bag is urgently needed to avoid this risk. Summary of the invention

[0004] Based on the content in the background technology, the utility model provides a hygroscopic multi-layer co-extruded film structure, which includes a barrier layer, a hygroscopic middle layer and a heat-seal breathable inner layer from the outside to the inside, the barrier layer is connected to one side of the hygroscopic middle layer, and the heat-seal breathable inner layer is connected to the other side of the hygroscopic middle layer. The above connection is specifically formed by three-layer co-extrusion blown film formation of the barrier layer, the hygroscopic middle layer and the heat-seal breathable inner layer; the hygroscopic multi-layer co-extruded film of this structure can be used to make hygroscopic packaging bags for various foods, medicines, and electronic products.

[0005] Preferably, the barrier layer is a HDPE film layer with a thickness of 10-15 um. The barrier layer is mainly used to prevent moisture outside the packaging bag from contacting the moisture absorption functional layer.

[0006] Preferably, the hygroscopic middle layer is a calcium oxide PE hygroscopic middle layer with a thickness of 15-25 um, which is specifically obtained by melt-extruding PE hygroscopic masterbatch dispersed with calcium oxide, and can meet the requirement of long-term hygroscopic use.

[0007] Preferably, the heat-sealable breathable inner layer is an LDPE film layer or an LLDPE film layer with a thickness of 10-15um; the heat-sealable breathable inner layer can meet the heat-seal performance requirements of the packaging bag and has a lower density, which helps the moisture in the packaging bag to pass through smoothly and contact with the above-mentioned hygroscopic middle layer.

[0008] Also provided is a hygroscopic packaging bag, which is made by cutting and heat-sealing the hygroscopic multi-layer co-extruded film.

[0009] Through the above technical solution, the utility model at least includes the following beneficial effects:

[0010] The hygroscopic multilayer co-extruded film of the structure described in the present application can be used to make hygroscopic packaging bags for various foods, medicines, and electronic products. The hygroscopic layer is integrated into the entire multilayer co-extruded film structure, which can effectively absorb moisture inside the packaging bag and block moisture from outside the packaging bag from entering. No additional desiccant packs are required, which can save costs and optimize production efficiency. The packaging bags with hygroscopic function made of the film avoid the risk of leakage and contamination caused by using desiccant packs and are reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of a hygroscopic multi-layer co-extruded film described in an embodiment of the present application. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the structures related to the present invention.

[0013] In the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship are only used for exemplary description and cannot be understood as limiting this patent; if there are terms such as "first", "second", etc., they are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the said features. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0014] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 utility model can be understood according to specific circumstances.

[0015] refer to Figure 1A hygroscopic multilayer co-extruded film structure comprises, from outside to inside, a barrier layer 1, a hygroscopic middle layer 2 and a heat-seal breathable inner layer 3, wherein the barrier layer 1 is connected to one side of the hygroscopic middle layer 2, and the heat-seal breathable inner layer 3 is connected to the other side of the hygroscopic middle layer 2, and the above connection is specifically formed by co-extruding and blowing the barrier layer 1, the hygroscopic middle layer 2 and the heat-seal breathable inner layer 3 into a three-layer film; the hygroscopic multilayer co-extruded film of this structure can be cut and heat-sealed to make hygroscopic packaging bags for various foods, medicines and electronic products.

[0016] The barrier layer 1 is a HDPE film layer with a thickness of 10 um, 13 um or 15 um. The barrier layer 1 is mainly used to prevent moisture outside the packaging bag from contacting the hygroscopic middle layer 2.

[0017] The hygroscopic middle layer 2 is a calcium oxide PE hygroscopic middle layer with a thickness of 15um, 20um or 25um. The hygroscopic middle layer 2 is specifically made by melt-extruding PE hygroscopic masterbatch dispersed with calcium oxide, which can meet the requirements of long-term hygroscopic use.

[0018] The heat-seal breathable inner layer 3 is a LDPE film layer or a LLDPE film layer with a thickness of 10um, 12um or 15um. In addition to being able to meet the heat-seal performance requirements of the packaging bag, the heat-seal breathable inner layer 3 also has a lower density, which helps the moisture in the packaging bag to pass through smoothly and contact with the above-mentioned hygroscopic middle layer 2.

[0019] In a preferred embodiment, the barrier layer 1 is 13um thick, the hygroscopic middle layer 2 is 20um thick, and the heat-sealable breathable inner layer 3 is a LLDPE film layer with a thickness of 12um. Such a hygroscopic multi-layer co-extruded film has a better drying and hygroscopic effect.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Based on the present invention and the above description, relevant personnel can make various changes and modifications without departing from the technical idea of ​​the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hygroscopic multilayer co-extruded film structure, characterized in that: From the outside to the inside, it comprises a barrier layer (1), a moisture-absorbing middle layer (2) and a heat-sealable breathable inner layer (3), wherein the barrier layer (1) is connected to one side of the moisture-absorbing middle layer (2), and the heat-sealable breathable inner layer (3) is connected to the other side of the moisture-absorbing middle layer (2).

2. A hygroscopic multi-layer co-extruded film structure according to claim 1, characterized in that: The barrier layer (1) is a HDPE film layer with a thickness of 10-15 um.

3. A hygroscopic multi-layer co-extruded film structure according to claim 1, characterized in that: The thickness of the hygroscopic middle layer (2) is 15-25 um.

4. A hygroscopic multi-layer co-extruded film structure according to claim 1, characterized in that: The heat-sealable breathable inner layer (3) is an LDPE film layer or an LLDPE film layer, and has a thickness of 10-15 um.

5. A hygroscopic packaging bag, characterized in that: The invention is made by cutting and heat-sealing the hygroscopic multi-layer co-extruded film described in any one of claims 1 to 4.

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