A paper lunch box with tearable film

Abstract

The utility model discloses a paper lunch box of tearable film, including lunch box body and the accommodating cavity of its inboard, lunch box body is along extension and is provided with shoulder, and the accommodating cavity top periphery is equipped with the exhaust hole, and the surface covers easy tear film, exhaust hole is through lunch box body and is in abutment with easy tear film, and easy tear film edge and shoulder hot -press fixed. Through the wave edge design of shoulder, reduce the hot -press area, and combine easy tear film and form easy -to -remove piece or shoulder gap structure, realize the film and easily tear off, and the dimethicone coating between lunch box body and easy tear film reduces the separation resistance while guaranteeing the stability of sticking.

Description

Technical Field

[0001] This utility model relates to the field of paper lunch box technology, specifically to a tearable coated paper lunch box. Background Technology

[0002] Traditional paper food containers made with lamination technology have become the mainstream choice for food packaging due to their excellent impermeability and mechanical strength. By uniformly coating the paper surface with plastic materials such as polyethylene (PE), the waterproof, oil-proof and tear-resistant properties of the paper boxes are significantly improved, while also having the advantages of high production efficiency and low cost.

[0003] However, the plastic layer of this design cannot be separated from the paper base, resulting in the packaging losing its overall recyclability. This directly violates the mandatory requirements of the EU's Single-Purpose Plastics Directive and other regulations for "recyclability and compostability," and faces pressure to completely ban it, especially in high-pollution-risk scenarios such as fresh meat. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a paper lunch box with a tearable film coating.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A tearable film-coated paper lunch box includes a lunch box body, an inner cavity is provided in the lunch box body, a shoulder extends along the upper edge of the lunch box body, an exhaust hole is provided circumferentially at the top of the cavity, an easy-tear film is provided on the surface of the cavity, the exhaust hole penetrates the lunch box body and abuts against the easy-tear film, and the edge of the easy-tear film is fixedly connected to the shoulder.

[0007] As a preferred technical solution, the upper surface of the shoulder is pressed with a wavy edge.

[0008] As a preferred technical solution, the outer periphery of the easy-tear film extends into a shoulder, forming an easy-tear sheet.

[0009] As a preferred technical solution, the shoulder is provided with a notch, and the easy-tear film located at the notch is the easy-peeling sheet.

[0010] As a preferred technical solution, multiple vents are evenly distributed around the outer periphery of the lunchbox body.

[0011] As a preferred technical solution, the lunch box body is made of kraft paper.

[0012] As a preferred technical solution, the easy-peel film is made of one of polyethylene film, polypropylene film, and polyester film.

[0013] As a preferred technical solution, the shoulder area is also provided with a side skirt.

[0014] As a preferred technical solution, a polydimethylsiloxane coating is also provided between the food container body and the easy-tear film.

[0015] As a preferred technical solution, the wave density of the wave edge is 2-3 waves / cm, the wave height is 1-3mm, and the wave length is 3-8mm.

[0016] The advantages and beneficial effects of this utility model are as follows: By setting an easy-tear film on the surface of the food container cavity, the plastic film can be easily removed after use, allowing the paper base to be independently recycled or composted, thus solving the risk of prohibition in high-pollution scenarios (such as fresh meat packaging). The easy-tear film can be vacuum-attracted to the food container body through the vent holes and then heat-pressed together at the shoulder. The wavy edge of the shoulder reduces the heat-pressing area, thereby retaining the easy-tear performance; the easy-peel tab reduces the difficulty of peeling off the film; a polydimethylsiloxane coating is also provided between the food container body and the easy-tear film. This achieves a stable fit between the food container body and the easy-tear film while reducing the frictional resistance between them. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0019] Figure 3 This is a partially enlarged schematic diagram of the present invention;

[0020] Figure label:

[0021] 1-Lunchbox body; 2-Containing cavity; 3-Shoulder; 4-Ventilation hole; 5-Wave edge; 6-Easy-open flap; 7-Side skirt; 8-Polydimethylsiloxane coating; 9-Easy-tear film. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0023] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] This utility model of a tearable coated paper lunch box is as follows: Figures 1 to 2 As shown, it mainly includes the lunchbox body 1 and the easy-tear film 9 covering it. The lunchbox body 1 is made of 180-230g / m³ material. 2 Food-grade kraft paper is molded to form an open-top cavity 2 on its inner side. The edge of the cavity 2 extends horizontally to form a shoulder 3 with a width of 8-12mm, ensuring sufficient hot-pressing area without affecting the overall strength. Vent holes 4 with a diameter of 0.5-1mm are evenly opened at intervals of 10-15mm on the top periphery of the cavity 2, and the vent holes 4 penetrate through the inner and outer sides of the lunch box body 1.

[0026] In practice, the lunchbox body 1 can be integrally formed using processes such as folding or molding. The design of the molding die or the folding opening must match the layout of the vent 4 in the attached diagram to ensure uniform film adhesion during vacuum suction. Anti-slip textures can be added to the bottom of the lunchbox body 1.

[0027] In some embodiments, the width of the wavy edge covers 80% of the total length of the shoulder. In practice, the wavy shape adopts a sine wave design (wavelength 5mm, wave height 2mm) to balance strength and tearability.

[0028] In the manufacturing process, the inner surface of the molded food container body 1 is first treated with a polydimethylsiloxane (PDMS) coating 8: a 5-10 μm thick coating is formed by spraying or roller coating, and a semi-adhesive interface is formed after hot air curing at 60℃. Then, an easy-tear film (not labeled in the illustration, material is 0.03 mm thick polyethylene film) is applied, and air is extracted from the vent 4 using a vacuum adsorption device to ensure the easy-tear film adheres tightly to the surface of the receiving cavity 2. Simultaneously, the shoulder 3 is heat-sealed. Here, an embossing roller can be used to press a wavy edge 5 onto the upper surface of the shoulder 3, with a wavy density of 2.5 wavy points / cm, a wave height of 2 mm, and a wavelength of 5 mm. The heat-pressing parameters are controlled at 0.15-0.25 MPa pressure and 130-150℃ temperature, melting and fixing the film edge while retaining its easy-tearability.

[0029] The easy-tear film features two peel-off aid structures in three shoulder areas: one of which is... Figure 1 As shown, the film extends beyond the edge of the shoulder 3 to form an easy-open tab 6; to reduce the impact of irregular structures, a notch can also be made in the shoulder 3, where the film naturally forms the easy-open tab 6. For large lunch boxes, a side skirt 7 with a height of 5mm can be added to the outside of the shoulder 3 to enhance structural stability.

[0030] During finished product inspection, the tear force of the easy-peel sheet 6 must be ≤3N when tested with a tensile testing machine (the PDMS coating 8 reduces the coefficient of friction to 0.2-0.25), ensuring that consumers can easily peel off the film. After peeling, the kraft paper substrate can directly enter the paper recycling process, while the polyethylene film is recycled separately, meeting the environmental requirements of EU laws and regulations for separable packaging.

[0031] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A paper lunch box with tearable film, characterized by, The lunch box includes a lunch box body (1), the inner side of which is provided with a receiving cavity (2), a shoulder (3) extending along the upper edge of the lunch box body (1), an exhaust hole (4) is provided on the top circumferentially of the receiving cavity (2), an easy-tear film is provided on the surface of the receiving cavity (2), the exhaust hole (4) penetrates the lunch box body (1) and abuts against the easy-tear film, and the edge of the easy-tear film is fixedly connected to the shoulder (3).

2. The tearable coated paper food tray of claim 1 wherein, The upper surface of the shoulder (3) is pressed with a wavy edge (5).

3. The tearable coated paper food tray of claim 1 wherein, The outer periphery of the easy-tear film extends into a shoulder (3), forming an easy-tear tab (6).

4. The tearable coated paper lunch box according to claim 3, characterized in that, The shoulder (3) is provided with a notch, and the easy-tear film located at the notch is the easy-peeling sheet (6).

5. The tearable coated paper food tray of claim 1 wherein, The exhaust vents (4) are evenly distributed around the outer periphery of the lunch box body (1).

6. The tearable coated paper food tray of claim 1 wherein, The lunchbox body (1) is made of kraft paper.

7. The tearable coated paper food tray of claim 1 wherein, The easy-tear film is made of one of polyethylene film, polypropylene film or polyester film.

8. The tearable coated paper food tray of claim 3 wherein, The shoulder (3) is also provided with a side skirt (7).

9. The tearable coated paper food tray of claim 1 wherein, A polydimethylsiloxane coating (8) is also provided between the lunch box body (1) and the easy-tear film.

10. The tearable coated paper food tray of claim 2 wherein, The wave density of the wave edge (5) is 2-3 waves / cm, the wave height is 1-3mm, and the wave length is 3-8mm.

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