CN221819664U - Flexible package composite film capable of being adhered and sealed and packaging bag - Google Patents

Abstract

The utility model discloses a flexible packaging composite film capable of being sealed and a packaging bag, which sequentially comprise a matte single-stage stretching polypropylene film, a first adhesive layer, a polyester film, a printing ink layer, a second adhesive layer and a single-stage stretching polypropylene/aluminizing film, wherein the matte single-stage stretching polypropylene film, the first adhesive layer, the polyester film, the printing ink layer, the second adhesive layer and the single-stage stretching polypropylene/aluminizing film are sequentially arranged, the upper surface of the matte single-stage stretching polypropylene film is an uncomplexed surface layer, the lower surface of the matte single-stage stretching polypropylene film is adhered with the polyester film through the first-year adhesive layer, the lower surface of the polyester film is provided with a printing ink layer, and the lower surface of the printing ink layer is adhered with the single-stage stretching polypropylene aluminizing film through the second adhesive layer. The structure of the composite film provided by the utility model is softer than the texture of the conventional structure, is not easy to leak air and break bags, saves more materials under the condition of packaging with the same specification, reduces the cost and is environment-friendly.

Description

A sealable soft packaging composite film and packaging bag

Technical Field

The utility model belongs to the technical field of new flexible packaging materials, and in particular relates to an improvement of an automatic packaging composite film and a packaging bag for light-packaged food.

Background Art

At present, the packaging materials commonly used in the light packaging of biscuits, candies, and puffed foods on the market are, from the outside to the inside, a matte biaxially oriented polypropylene film printing layer, a polyester aluminum-plated film layer compounded by an adhesive, and then a uniaxially oriented polypropylene film layer compounded by an adhesive. This packaging material structure is relatively hard, with poor texture, and is prone to air leakage when used as an inflatable package, and is prone to bag breakage in winter. Therefore, it is very necessary to improve the existing flexible packaging composite film so that it can at least achieve the purpose of being soft in structure and good in texture, and not easy to leak or break.

Summary of the invention

In view of the shortcomings of the prior art, the purpose of the utility model is to provide a sealable soft packaging composite film and a packaging bag made of the composite film, which aims to solve the problems of the existing soft packaging structure of biscuits, candies and puffed foods being relatively hard, poor in texture and easy to leak and break.

To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a sealable flexible packaging composite film, which comprises, in sequence, a matte unidirectional stretched polypropylene film, a first adhesive layer, a polyester film, a printing ink layer, a second adhesive layer, and a unidirectional stretched polypropylene/aluminum-plated film; the upper surface of the matte unidirectional stretched polypropylene film is an uncompounded surface layer, and the lower surface thereof is bonded to the polyester film through the first adhesive layer; a printing ink layer is provided on the lower surface of the polyester film, and the lower surface of the printing ink layer is bonded to the unidirectional stretched polypropylene/aluminum-plated film through the second adhesive layer.

Preferably, the uncompounded surface layer of the matte uniaxially oriented polypropylene film has heat-sealability and can be sealed with the uniaxially oriented polypropylene/aluminum-coated film by overlapping heat sealing.

Preferably, the matte uniaxially oriented polypropylene film has a thickness of 20-50 μm.

Preferably, the thickness of the uniaxially oriented polypropylene/aluminum-coated film is 20-40 μm.

Preferably, the polyester film has a thickness of 12-20 μm.

Preferably, the printing ink layer has a thickness of 1-3 μm.

Preferably, the first adhesive layer and the second adhesive layer are both solvent-free polyurethane adhesive layers, or both are dry composite polyurethane adhesive layers, and their thicknesses are 1-2 μm respectively.

A packaging bag, the bag body of which is made of a composite film, and the composite film is the above-mentioned sealable flexible packaging composite film.

The utility model has the following beneficial effects:

The sealable composite film for flexible packaging provided by the utility model comprises, in sequence, a matte uniaxially stretched polypropylene film layer, an adhesive layer, a polyester film layer, a printing ink layer, an adhesive layer, and a uniaxially stretched polypropylene/aluminum-plated film layer. Compared with a conventional structure, the structure adopts two layers of uniaxially stretched polypropylene film materials, so that the finished product structure has better tensile resistance and softness, and thus has more advantages in inflatable packaging products, is less likely to leak, and is less likely to break in winter; in addition, because it is soft and the surface layer is a matte uniaxially stretched polypropylene film, the packaging color has a better texture; at the same time, because the surface layer is a heat-sealable matte uniaxially stretched polypropylene film layer and the inner layer is a heat-sealable uniaxially stretched polypropylene/aluminum-plated film layer, the two can be overlapped and heat-sealed during heat sealing, thereby reducing the edge sealing waste of about 10 mm compared with the conventional structure that can only be heat-sealed by the inner heat-sealing layer, thus saving materials and reducing production costs, thereby meeting environmental protection requirements. In short, the sealable soft packaging composite film provided by the utility model has a softer texture, is not prone to air leakage and bag breakage, saves more materials, reduces costs, and is environmentally friendly under the same packaging specifications.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic cross-sectional view of the structure of the present utility model;

In the figure: 1-matte uniaxially stretched polypropylene film; 2-first adhesive layer; 3-polyester film; 4-printing ink layer; 5-second adhesive layer; 6-uniaxially stretched polypropylene/aluminum-coated film.

DETAILED DESCRIPTION

The present invention will be further explained below in conjunction with a specific implementation scheme, but it is not intended to limit the present invention. The structures, proportions, sizes, etc. illustrated in the accompanying drawings of the specification are only used to match the contents disclosed in the specification so that people familiar with the technology can understand and read them. They are not intended to limit the limiting conditions that the present invention can implement, so they do not have substantial technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and the like cited in this specification are only for the convenience of narration, and are not intended to limit the scope of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the present invention without substantial changes in the technical content.

Please refer to FIG. 1 , which shows a sealable composite film for flexible packaging, comprising, in sequence, a matte monoaxially stretched polypropylene film, a first adhesive layer, a polyester film, a printing ink layer, a second adhesive layer, and a monoaxially stretched polypropylene/aluminum-plated film. The upper surface of the matte monoaxially stretched polypropylene film is an uncompounded surface layer, and the lower surface thereof is bonded to the polyester film through the first adhesive layer. The thickness of the matte monoaxially stretched polypropylene film is 25 μm. A printing ink layer is provided on the lower surface of the polyester film, and the lower surface of the printing ink layer is bonded to the monoaxially stretched polypropylene/aluminum-plated film through the second adhesive layer. The thickness of the polyester film is 12 μm, the thickness of the printing ink layer is 2 μm, and the thickness of the monoaxially stretched polypropylene/aluminum-plated film is 25 μm. Both the first adhesive layer and the second adhesive layer may adopt solvent-free polyurethane adhesive layers or dry composite polyurethane adhesive layers, and the thickness of both of them is 2 μm.

The uncompounded surface layer of the matte unidirectional stretched polypropylene film has heat-sealability and can be sealed with the unidirectional stretched polypropylene/aluminum-coated film by overlapping heat sealing. Compared with the conventional structure that can only be sealed by butt heat sealing through the inner heat-sealing layer, the edge sealing waste of about 10 mm can be reduced, thereby saving materials and reducing production costs, thereby meeting environmental protection requirements.

The polyester film can be printed with patterns and texts and then composited to the middle layer through the first and second adhesive layers; the composite surface layer of the matte unidirectional stretched polypropylene film is composited with the polyester film layer (i.e., the middle material layer) with printed patterns and texts, so that the color and texture of the pattern can be soft; the first and second adhesives can be solvent-free adhesives or dry composite adhesives; the inner composite layer can be a unidirectional stretched polypropylene aluminum-plated film or a unidirectional stretched polypropylene film.

The manufacturing method of the composite film described in the utility model is as follows: firstly, an ink pattern is printed on the lower side of the polyester film layer; then, a composite glue coating machine is used to composite a matte uniaxially oriented polypropylene film on the upper side of the polyester film layer through a first adhesive layer; then, the printed pattern surface on the lower side of the polyester film layer is composited with the aluminum-plated layer of the uniaxially oriented polypropylene/aluminum-plated film through a second adhesive; finally, the composite film is cured and dried, and then cooled and cut for use.

The sealable flexible packaging composite film provided by the utility model is composited with three layers of materials through an adhesive, and the materials are, from the outside to the inside, a surface matte uniaxially stretched polypropylene film composite layer, a middle layer polyester film printing ink layer, and an inner layer uniaxially stretched polypropylene/aluminum-plated film composite heat-sealing layer; while the materials of the conventional structure are, from the outside to the inside, a surface matte biaxially stretched polypropylene film printing ink layer, a middle layer polyester aluminum-plated film composite layer, and an inner layer uniaxially stretched polypropylene film composite heat-sealing layer. It can be seen that compared with the conventional structure, the sealable flexible packaging composite film provided by the utility model adopts two layers of uniaxially stretched polypropylene film materials, so that the finished product structure has better tensile resistance and softness, so it has more advantages in inflatable packaging products, is less likely to leak, and is less likely to break in winter; in addition, because it is soft and the surface layer is a matte uniaxially stretched polypropylene film, the packaging color has a more textured feel; at the same time, because the surface layer is a heat-sealable matte uniaxially stretched polypropylene film layer and the inner layer is a heat-sealable uniaxially stretched polypropylene/aluminum-plated film layer, the two can overlap and fit together during heat sealing, thereby reducing the edge sealing waste of about 10 mm compared to the conventional structure that can only be heat-sealed through the inner heat-sealing layer, thereby saving materials and reducing production costs, thereby meeting environmental protection requirements.

On the other hand, this embodiment further provides a packaging bag, wherein the bag body of the packaging bag is made of a composite film, and the composite film is the above-mentioned sealable flexible packaging composite film.

The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims (8)

1. The utility model provides a can paste flexible package complex film, its characterized in that includes matte single-item tensile polypropylene film (1), first adhesive layer (2), polyester film (3), printing ink layer (4), second adhesive layer (5), single-item tensile polypropylene/aluminizing film (6) in proper order, the upper surface of matte single-item tensile polypropylene film (1) is not compound surface course, and its lower surface bonds together with polyester film (3) through first adhesive layer (2), and the lower surface of polyester film (3) is provided with printing ink layer (4), and the lower surface of printing ink layer (4) bonds together with single-item tensile polypropylene/aluminizing film (6) through second adhesive layer (5).

2. The sealable flexible packaging composite film according to claim 1, wherein: the non-composite surface layer of the matte single-direction stretching polypropylene film (1) has heat-sealing performance and can be sealed by lap heat sealing with the single-direction stretching polypropylene/aluminized film (6).

3. The sealable flexible packaging composite film according to claim 1, wherein: the thickness of the matte single-direction stretching polypropylene film (1) is 20-50 mu m.

4. The sealable flexible packaging composite film according to claim 1, wherein: the thickness of the single-way stretching polypropylene/aluminized film (6) is 20-40 mu m.

5. The sealable flexible packaging composite film according to claim 1, wherein: the thickness of the polyester film (3) is 12-20 mu m.

6. The sealable flexible packaging composite film according to claim 1, wherein: the thickness of the printing ink layer (4) is 1-3 mu m.

7. The sealable flexible packaging composite film according to claim 1, wherein: the first adhesive layer (2) and the second adhesive layer (5) are solvent-free polyurethane adhesive layers or dry composite polyurethane adhesive layers, and the thicknesses of the adhesive layers are respectively 1-2 mu m.

8. A packaging bag, wherein the bag body of the packaging bag is made of a composite film, and the composite film is a flexible packaging composite film capable of being sealed according to any one of claims 1 to 7.