Microwave composite packaging film, microwave bag and packaging box

Abstract

The utility model discloses a kind of microwave composite packaging films, including inner heat sealing film layer and outer printing film layer, ink printing layer is provided on the outer printing film layer, adhesive layer is provided between the ink printing layer and inner heat sealing film layer, further include release agent layer, the release agent layer is set between ink printing layer and adhesive layer, and release agent layer is in the state of being covered by ink printing layer and adhesive layer, adhesive layer and inner heat sealing film layer are opened with half perforation, one orifice of the half perforation is located on the surface of inner heat sealing film layer, another orifice of half perforation is located on the side of release agent layer. Microwave bag and packaging box comprising the packaging film are also disclosed in the application.

Description

Technical Field

[0001] This utility model relates to packaging products, and more particularly to a microwave composite packaging film. Background Technology

[0002] In the food packaging industry, microwaveable packaging is widely used because it meets the demand for rapid food heating in today's fast-paced lifestyle. However, this type of packaging faces a key problem during microwave heating: the food inside rapidly generates a large amount of steam when heated, causing a sharp increase in pressure inside the bag, which can lead to the bag bursting. To avoid this bursting phenomenon caused by gas expansion, patent publication CN221164060U discloses a microwaveable bag that can be heated by microwaves. This type of microwaveable bag uses a sealing zipper to form a temporary, breathable seal before microwave heating. Therefore, this type of microwaveable bag must be opened before heating food, and then the sealing zipper is used to form a temporary seal. Because the packaging needs to be opened beforehand, and the process of opening the packaging may lead to food contamination, the reliability of this type of microwaveable bag when heating food is relatively poor. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a microwave composite packaging film. This composite film incorporates a release agent layer and a semi-perforated hole on one side, enabling direct microwave heating after packaging without the need to break the bag for heating. This enhances reliability and reduces the probability of gas bursting during heating.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A microwave composite packaging film includes an inner heat-sealing film layer and an outer printed film layer. An ink printing layer is disposed on the outer printed film layer. An adhesive layer is disposed between the ink printing layer and the inner heat-sealing film layer. The film also includes a release agent layer disposed between the ink printing layer and the adhesive layer, and the release agent layer is covered by the ink printing layer and the adhesive layer. A semi-perforation is formed on the adhesive layer and the inner heat-sealing film layer. One opening of the semi-perforation is located on the surface of the inner heat-sealing film layer, and the other opening of the semi-perforation is located on one side of the release agent layer.

[0006] This type of composite film first sets a release agent layer between the ink printing layer and the adhesive layer. The release agent layer significantly reduces the adhesion between the upper and lower layers in this area and forms a strip-shaped release band. The amount of release agent coating gradually decreases from the middle of the packaging bag to the heat-sealed edges on both sides, that is, the amount of release agent coating in the middle area is less than the amount of release agent coating in the side areas.

[0007] When the packaging bag prepared by this composite film is heated, the food generates steam, and the pressure inside the bag gradually increases. The semi-perforated structure of the composite film becomes the "initial outlet," allowing gas to enter the middle release band area. Due to the weak adhesion of the release band and the gradual change in adhesive force along the exhaust trajectory caused by the gradual change in the amount of release agent coating, when the pressure is low, the gas is initially discharged from the edge area with low adhesive force. When the pressure increases, the middle area also gradually separates. The gas opens up the longitudinal strip channel here and moves along the preset channel, and finally exits from the interlayer of the packaging bag. This can reduce the "burst" phenomenon during exhaust. Therefore, microwave bags prepared using this composite film can be heated directly without breaking them open before heating.

[0008] Specifically, the outer printed film layer of this composite film includes, but is not limited to, a PET film layer, and the inner heat-sealing film layer includes, but is not limited to, a PE film layer or a PP film layer.

[0009] In summary, this type of composite film, by setting a release agent layer inside the composite film and inserting a semi-perforation on one side of the film, enables direct microwave heating after encapsulation without the need to break the bag for heating, resulting in higher reliability and a relatively low probability of gas bursting during heating.

[0010] Optionally, the semi-perforation is a circular semi-perforation, and the diameter of the semi-perforation is 0.3 mm to 3 mm, and the distance between two adjacent semi-perforations is 2 mm to 20 mm.

[0011] Optionally, the semi-perforation is a linear semi-perforation with a length of 2 mm to 5 mm and a spacing of 5 mm to 20 mm between adjacent semi-perforations.

[0012] A semi-perforation can be circular or linear.

[0013] A microwave bag includes a microwave composite packaging film as described above, wherein the edges of the microwave composite packaging film are heat-sealed together to form a bag body, the edges of the bag body are heat-sealed areas, and the release agent layer located in the heat-sealed area has through holes.

[0014] The presence of the release agent layer can cause interlayer separation in the composite film, and dust may enter the interlayer through the release strip, contaminating the contents. However, the through-holes do not contain release agent, which can ensure high adhesion strength at the through-holes and can close the entrance and block external dust.

[0015] Optionally, the bag body is a back-sealed bag body.

[0016] Optionally, the bag body is a self-standing bag body.

[0017] Optionally, the through holes are distributed in a dot matrix pattern in the heat-sealing area.

[0018] A packaging box includes a box tray and a microwave composite packaging film as described above. The microwave composite packaging film is thermally bonded to the edge of the box tray to form a heat-sealed area, and the heat-sealed area is located on the microwave composite packaging film. The release agent layer located in the heat-sealed area has through holes, and the through holes are distributed in a dot matrix pattern in the heat-sealed area.

[0019] The presence of the release agent layer can cause interlayer separation in the composite film, and dust may enter the interlayer through the release strip, contaminating the contents. However, the through-holes do not contain release agent, which can ensure high adhesion strength at the through-holes and can close the entrance and block external dust.

[0020] The beneficial effects of this utility model are: by setting a release agent layer inside the composite film and setting a semi-perforation on one side of the film, it is possible to directly microwave heat after sealing without breaking the bag for heating, which is more reliable and the probability of gas bursting during heating is relatively low. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a simplified structural diagram of Example 1;

[0023] Figure 2 This is a simplified structural diagram of Example 2;

[0024] Figure 3 This is a simplified enlarged schematic diagram of point A in Example 2;

[0025] Figure 4 This is a simplified structural diagram of Example 3;

[0026] Figure 5 This is a simplified structural diagram of Example 4.

[0027] The figures are labeled as follows: 101, outer printed film layer; 102, ink printing layer; 103, adhesive layer; 104, inner heat-sealing film layer; 105, release agent layer; 106, semi-perforated; 11, heat-sealed area; 12, back-sealed area; 13, release tape; 14, through hole; 2, box tray. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] Example 1

[0032] As attached Figure 1 As shown, a microwave composite packaging film includes an inner heat-sealing film layer 104 and an outer printed film layer 101. An ink printing layer 102 is disposed on the outer printed film layer 101. An adhesive layer 103 is disposed between the ink printing layer 102 and the inner heat-sealing film layer 104. The film also includes a release agent layer 105, which is disposed between the ink printing layer 102 and the adhesive layer 103 and is covered by the ink printing layer 102 and the adhesive layer 103. A semi-perforated hole 106 is formed on the adhesive layer 103 and the inner heat-sealing film layer 104. One opening of the semi-perforated hole 106 is located on the surface of the inner heat-sealing film layer 104, and the other opening of the semi-perforated hole 106 is located on one side of the release agent layer 105.

[0033] This type of composite film first sets a release agent layer 105 between the ink printing layer 102 and the adhesive layer. The release agent layer 105 significantly reduces the adhesion between the upper and lower layers in this area and forms a strip-shaped release band 13. The amount of release agent coating gradually decreases from the middle of the packaging bag to the heat-sealed edges on both sides, that is, the amount of release agent coating in the middle area is less than the amount of release agent coating in the side areas.

[0034] When the packaging bag prepared by this composite film is heated, the food generates steam, and the pressure inside the bag gradually increases. The semi-perforated structure 106 of the composite film becomes the "initial outlet," allowing gas to enter the middle release band 13 area. Due to the weak adhesion of the release band 13, and the gradual change in adhesive force along the exhaust trajectory caused by the gradual change in the amount of release agent coating, when the pressure is low, the gas is initially discharged from the edge area with low adhesive force. When the pressure increases, the middle area also gradually separates. The gas opens up the longitudinal strip channel here and moves along the preset channel, and finally exits from the interlayer of the packaging bag. This can reduce the "burst" phenomenon during exhaust. Therefore, the microwave bag prepared by this composite film can be heated directly without breaking it open for heating.

[0035] Specifically, in this type of composite film, the outer printed film layer 101 includes, but is not limited to, a PET film layer, and the inner heat-sealing film layer 104 includes, but is not limited to, a PE film layer or a PP film layer.

[0036] In this embodiment, the semi-perforated hole 106 can be a circular semi-perforated hole 106. When the semi-perforated hole 106 is a circular semi-perforated hole 106, the hole diameter of the semi-perforated hole 106 is 0.3 mm to 3 mm, and the distance between two adjacent semi-perforated holes 106 is 2 mm to 20 mm.

[0037] In this embodiment, the semi-perforated hole 106 can be a linear semi-perforated hole 106. When the semi-perforated hole 106 is a linear semi-perforated hole 106, the length of the semi-perforated hole 106 is 2 mm to 5 mm, and the spacing between adjacent semi-perforated holes 106 is 5 mm to 20 mm.

[0038] Example 2

[0039] As attached Figure 2 As shown in Figure 3, a microwave bag is made from a microwave composite packaging film as shown in Example 1. The edges of the microwave composite packaging film are heat-sealed together to form a bag body. The edge of the bag body is a heat-sealed area. The release agent layer located in the heat-sealed area 11 has through holes 14. The bag body is a back-sealed bag body, and a back-sealed area 12 is provided on the bag body.

[0040] Example 3

[0041] As attached Figure 4 As shown, a microwave bag is made from a microwave composite packaging film as shown in Example 1. The edges of the microwave composite packaging film are heat-sealed together to form a bag body. The edge of the bag body is a heat-sealed area 11. The release agent layer located in the heat-sealed area 11 has through holes 14, and the bag body is a self-standing bag body.

[0042] Example 4

[0043] The package includes a box tray 2 and a microwave composite packaging film 1 as shown in Example 1. The microwave composite packaging film 1 and the edge of the box tray 2 are thermally bonded together to form a heat-sealed area 11. The heat-sealed area 11 is located on the microwave composite packaging film 1. The release agent layer in the heat-sealed area 11 has through holes 14, which are distributed in a dot matrix pattern in the heat-sealed area.

[0044] In Examples 2 to 4, the size of the through hole 14 on the side closer to the inside of the bag (and the inside of the box) is smaller than the size on the side farther away from the inside of the bag (and the inside of the box).

[0045] The above-described embodiments only illustrate some aspects of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A microwave-safe composite packaging film, comprising an inner heat-sealing film layer and an outer printed film layer, wherein an ink printing layer is disposed on the outer printed film layer, and an adhesive layer is disposed between the ink printing layer and the inner heat-sealing film layer, characterized in that, It also includes a release agent layer, which is disposed between the ink printing layer and the adhesive layer, and is covered by the ink printing layer and the adhesive layer. The adhesive layer and the inner heat-sealing film layer have semi-perforations, one opening of which is located on the surface of the inner heat-sealing film layer, and the other opening of which is located on one side of the release agent layer.

2. The microwave composite packaging film according to claim 1, characterized in that, The semi-perforation is circular, with a diameter of 0.3 mm to 3 mm and a spacing of 2 mm to 20 mm between adjacent semi-perforations.

3. The microwave composite packaging film according to claim 1, characterized in that, The semi-perforation is a linear semi-perforation with a length of 2 mm to 5 mm and a spacing of 5 mm to 20 mm between adjacent semi-perforations.

4. A microwaveable bag, characterized in that, The microwave composite packaging film as described in any one of claims 1 to 3 is included, wherein the edges of the microwave composite packaging film are heat-sealed together to form a bag body, the edges of the bag body are heat-sealed areas, and the release agent layer located in the heat-sealed area has through holes.

5. A microwave bag according to claim 4, characterized in that, The bag is a back-sealed bag.

6. A microwave bag according to claim 4, characterized in that, The bag is a self-standing type.

7. A microwave bag according to claim 4, characterized in that, The through holes are distributed in a dot matrix pattern in the heat-sealing area.

8. A packaging box, comprising a box tray, characterized in that, It also includes the microwave composite packaging film as described in any one of claims 1 to 3, wherein the microwave composite packaging film is thermally bonded to the edge of the box tray to form a heat-sealed area, and the heat-sealed area is located on the microwave composite packaging film, wherein the release agent layer located in the heat-sealed area has through holes, and the through holes are distributed in a dot matrix pattern in the heat-sealed area.

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