Easily-uncovered cover film attached with breathable film

Abstract

The easy-to-uncover film is provided with a windowing position, the windowing position covers the breathable film, a non-windowing position is sequentially provided with a printing layer, a blocking layer, a PET middle layer and a heat sealing layer, the breathable film and the heat sealing layer are both composite layers comprising PE layers, the breathable film is connected with the PE layers of the heat sealing layer, the PET middle layer is connected with the heat sealing layer, and the heat sealing layer is connected with the breathable film. The breathable film is a multi-layer co-extrusion film made of calcium carbonate and polyethylene, and the heat sealing layer is a polyethylene resin multi-layer composite layer, so that the breathability of the easy-to-uncover film is guaranteed, the swelling phenomenon of the cover film is improved, and the splashing phenomenon is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of composite cover film technology, specifically relating to an easy-open cover film with a breathable membrane. Background Technology

[0002] Currently, some cosmetic lids on the market, such as those on face cream jars and cushion compacts, have the following problems:

[0003] ① Some products may bulge due to the air inside not being able to escape during normal sealing;

[0004] ② Some products may produce gas after being left for a period of time, which may cause splashing when consumers open the cover. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides an easy-open cover film with a breathable membrane.

[0006] The technical solution of this utility model is an easy-open cover film with a breathable membrane. The easy-open cover film has a window opening that covers the breathable membrane. The non-window opening is provided with a printing layer, a barrier layer, a PET intermediate layer and a heat-sealing layer in sequence. The breathable membrane and the heat-sealing layer are both composite layers including a PE layer. The PE layers of the breathable membrane and the heat-sealing layer are in contact. The breathable membrane is a multi-layer co-extruded film made of calcium carbonate and polyethylene. The heat-sealing layer is a multi-layer composite layer of polyethylene resin.

[0007] Preferably, an adhesive layer is provided between the printed layer and the barrier layer, and an adhesive layer is provided between the PET intermediate layer and the heat-sealing layer.

[0008] Preferably, the material of the barrier layer is selected from one or more of the following: high-barrier PET film, aluminum foil, aluminized film, and alumina coating.

[0009] Preferably, the printing layer uses PET as the printing base film material.

[0010] Preferably, the diameter of the window opening is smaller than the diameter of the breathable membrane.

[0011] Preferably, the breathable membrane has a three-layer or five-layer structure.

[0012] Preferably, the heat-sealing layer has a five-layer structure.

[0013] Preferably, the easy-open cover film is a PET / AL / PET / PE film.

[0014] The beneficial effects of this utility model are:

[0015] This invention utilizes a breathable membrane made of calcium carbonate and polyethylene, which is formed by blown film. During the blown film process, the polyethylene particles are stretched, and the calcium carbonate is distributed in the pores of the stretched polyethylene. The permeability is adjusted by utilizing the dispersion properties of calcium carbonate and polyethylene during thermal stretching, ensuring the breathability of the easy-to-open cover film, improving the bulging phenomenon of the cover film, and preventing splashing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the easy-open cover film structure described in this utility model;

[0017] Among them, 1 is the PET printing base film layer, 2 is the ink printing layer, 3 is the first adhesive layer, 4 is the barrier layer, 5 is the second adhesive layer, 6 is the PET layer, 7 is the third adhesive layer, 8 is the heat-sealing layer, and 9 is the breathable film layer. Detailed Implementation

[0018] The technical solution of this utility model will be further explained below through embodiments, but the protection scope of this utility model is not limited in any way by the embodiments.

[0019] Example 1:

[0020] The technical solution of this utility model is an easy-open cover film with a breathable membrane. The easy-open cover film has a window, which is covered by the breathable membrane. The window is "◎" shaped and its diameter is smaller than the diameter of the breathable membrane layer. In the non-windowed areas, a printing layer, a barrier layer 4, a PET layer 6, and a heat-sealing layer 8 are sequentially arranged. A first adhesive layer 3 is placed between the printing layer and the barrier layer 4, and a second adhesive layer 5 is placed between the barrier layer 4 and the PET layer 6. A third adhesive layer 7 is placed between the PET layer 6 and the heat-sealing layer 8. Both the breathable membrane layer 9 and the heat-sealing layer 8 are composite layers including a PE layer. The PE layers of the breathable membrane layer 9 and the heat-sealing layer 8 are connected. The breathable membrane 9 is a multi-layer composite layer made of calcium carbonate and polyethylene, and is placed at the bottom of the easy-open cover film. The heat-sealing layer 8 is a multi-layer composite layer of polyethylene resin.

[0021] Preferably, the printing layer uses PET as the printing base film material, and the barrier layer material is selected from one or more of the following: high-barrier PET film, aluminum foil, metallized film, and alumina coating.

[0022] Preferably, the breathable membrane layer 9 has a three- or five-layer structure, and the heat-sealing layer 8 has a five-layer structure.

[0023] In this embodiment, the breathable membrane layer 9 is produced by a three- or five-layer co-extrusion blown film process. The principle is that during the blown film process, the polyethylene is stretched at the edge of the calcium carbonate so that the calcium carbonate is distributed throughout the holes of the stretched polyethylene, giving the membrane a breathable function. The PE component is heat-sealed with the PE component at the window of the composite membrane.

[0024] The manufacturing process of this breathable cover film includes a heat-sealing process for splicing the breathable film layer and the cover film, involving printing, dry lamination, curing, and bag making processes. The final product is an easy-open cover film with a breathable membrane. The printing layer uses PET as the printing base film material and is produced using a printing process; this is the PET base film layer 1 / ink printing layer 2. The barrier layer 4 can be made of high-barrier PET film, aluminum foil, aluminized film, alumina coating, etc., and is laminated with the semi-finished film of the printing layer using a dry lamination process to obtain a composite semi-finished product.

[0025] The heat-sealable film is a PE-based easy-peel film with an optimal thickness between 40 and 120 μm. Its characteristics are:

[0026] 1. It is produced using a five-layer co-extrusion blown film process. The formula uses polyethylene, polyethylene-ethylene acrylate and polyethylene-acrylic acid are produced according to a specific formula. The first, second and third layers use polyethylene resin, the fourth layer uses polyethylene: polyethylene-ethylene acrylate in a 1:1 ratio, and the fifth layer uses polyethylene: polyethylene-acrylic resin in a 1:4 ratio.

[0027] 2. The heat seal strength is stable within a certain temperature range (123℃~185℃), which can ensure both sealing performance and ease of removal.

[0028] 3. The composite membrane is prepared by laminating it with the semi-finished membranes from steps two and four using a dry lamination process.

[0029] In this embodiment, the composite film layer can be composed of multiple layers from top to bottom: a PET printing layer, a printing ink layer, an adhesive layer, an AL barrier layer, an adhesive layer, a PET intermediate layer, an adhesive layer, and a PE heat-sealing layer. The printing layer, barrier layer, intermediate layer, and heat-sealing layer all employ a dry lamination process. The intermediate layer and heat-sealing layer can also use a solvent-free lamination process. As a preferred material, the easy-open lid film is made of PET / AL / PET / PE film composite, which is then cured at high temperature. A window is then die-cut at a designated location, matching the position of the permeable membrane for better results. Positioning and splicing the easy-open lid film and the permeable membrane prevents bulging and splashing when consumers use certain canned goods. After the composite film layer is formed, a window is created (the diameter of the window area should be smaller than the diameter of the gasket window area). The window position, as shown in the figure, should be the same as the position of the permeable membrane. After high-temperature curing, the composite film can be transferred to bag production.

[0030] The breathable membrane is die-cut at designated locations, including slits and window openings (the diameter of the window opening area should be larger than the diameter of the composite film window opening area, i.e., the diameter of the composite film window opening is smaller than the diameter of the gasket, forming a "◎" shape). The breathable membrane layer is then heat-sealed at designated locations with the upper and lower heat-sealing PE layers of the composite film. Edge-collecting machines are installed on both sides of the bag-making machine to roll up excess cut material. For the standard easy-to-open heat-seal area: heat-sealing pressure 0.2~0.8MPa, heat-sealing temperature 150±30℃, heat-sealing strength 5±2N / 15mm.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. An easy-open cover film with a breathable membrane, characterized in that: The easy-open cover film has a window opening that covers the breathable membrane layer. The non-window opening area consists of a printing layer, a barrier layer, a PET interlayer, and a heat-sealing layer arranged sequentially. Both the breathable membrane layer and the heat-sealing layer are composite layers containing a PE layer. The PE layers of the breathable membrane layer and the heat-sealing layer are in contact. The breathable membrane layer is placed at the bottom of the easy-open cover film. The heat-sealing layer is a multi-layer composite layer of polyethylene resin. An adhesive layer is provided between the printing layer and the barrier layer, and between the PET interlayer and the heat-sealing layer. The diameter of the window opening is smaller than the diameter of the breathable membrane. The breathable membrane layer has a three- or five-layer structure. The heat-sealing layer has a five-layer structure.

2. The easy-open cover film with a breathable membrane according to claim 1, characterized in that: The barrier layer is made of one or more of the following materials: high-barrier PET film, aluminum foil, aluminized film, and alumina coating.

3. The easy-open cover film with a breathable membrane according to claim 1, characterized in that: The printing layer uses PET as the printing base film material.

4. The easy-open cover film with a breathable membrane according to claim 1, characterized in that: The easy-open cover film is a PET / AL / PET / PE film.

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