Heat-sealing plastic bag

Abstract

The utility model relates to the field of plastic bags, and discloses a heat-sealing plastic bag which comprises a plastic bag body, and the plastic bag body comprises an inner layer, a waterproof layer, a heat insulation layer, a reinforcing layer and an outer layer. Meanwhile, secondary sealing is carried out through the tooth-shaped sealing opening, the sealing performance in the product transportation process is guaranteed, when a user needs to tear the heat-sealing plastic bag, tearing is carried out along the dotted line part of the through hole, after tearing is carried out, one end of the heat-sealing line and one end of the reinforcing rib are vertically cut off, and the purpose of opening the first-layer sealing structure of the plastic bag is achieved; meanwhile, the notch part torn along the through hole cannot be directly broken, and the notch part can be connected with the plastic bag body due to the fact that the other end of the reinforcing rib is connected with the plastic bag body, so that the problems of environmental pollution and the like caused by the fact that a user throws the torn notch about are solved.

Description

Technical Field

[0001] The utility model relates to the field of plastic bags, in particular to a heat-sealed plastic bag. Background Art

[0002] Heat-sealable plastic bags are packaging bags made by sealing plastic film using heat-sealing technology. This technology uses heat and pressure to seal the edges of the plastic bag, closing it and ensuring the safety and sanitation of the packaged contents. Heat-sealable plastic bags are widely used in food, pharmaceuticals, cosmetics, and other industries requiring airtight packaging.

[0003] In the application number CN202222552345.0, a "heat-sealed plastic bag" is disclosed. This application solves the problem that existing heat-sealed plastic bags are difficult to have good printing performance while the inner side of the bag opening can resist the adhesion of oily substances. However, after the heat-sealed plastic bag in this application is heat-sealed, it is difficult to tear the plastic bag open manually. In practice, when designing a heat-sealed plastic bag, it is necessary to open a tear notch on the side end of the heat seal to facilitate users to manually tear open the plastic bag. However, the size of the tear notch needs to be carefully considered to avoid adverse effects on the sealing of the plastic bag and the user's experience. If the tear notch is too large, it may cause air leakage inside the heat-sealed plastic bag, affecting the shelf life and safety of the product. If the tear notch is too small, the user may find it difficult to manually tear open the plastic bag, affecting the user's experience. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the utility model provides a heat-sealed plastic bag, which solves the problem that the tear size of the current heat-sealed plastic bag is difficult to control, the tear is too large to affect the sealing of the plastic bag, and the tear is too small to make the plastic bag difficult to tear.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heat-sealable plastic bag, comprising a plastic bag body, the plastic bag body comprising an inner layer, a waterproof layer, an insulating layer, a reinforcing layer and an outer layer, the outer side of the inner layer is hot-melt-bonded with the waterproof layer, the outer side of the waterproof layer is hot-melt-bonded with the insulating layer, the outer side of the insulating layer is hot-melt-bonded with the reinforcing layer, and the outer side of the reinforcing layer is hot-melt-bonded with the outer layer, the upper end of the side surface of the plastic bag body is provided with a tearing structure, the tearing structure comprises a through hole and a heat-sealing line, the upper end of the side surface of the plastic bag body is fixedly connected with a reinforcing rib, the lower end of the reinforcing rib is provided with a heat-sealing line, a plurality of through holes are penetrated by the heat-sealing line and one end surface of the reinforcing rib, the lower end of the heat-sealing line is provided with a tooth-shaped seal, and the tooth-shaped seal is provided on the outer surface of the plastic bag body.

[0006] Preferably, the material of the inner layer is biodegradable polylactic acid.

[0007] Preferably, the waterproof layer is made of nano-scale silicon oxide.

[0008] Preferably, the thermal insulation layer is made of graphene nanofibers.

[0009] Preferably, the reinforcement layer is made of plant cellulose nanofiber.

[0010] Preferably, the outer layer is made of UV-resistant polyester film.

[0011] Preferably, the upper ends of both side surfaces of the plastic bag body are provided with a handle structure, and the handle structure includes hot melt adhesive and a reinforced handle, and the reinforced handle is fixedly connected to the upper ends of both side surfaces of the plastic bag body by the hot melt adhesive.

[0012] Preferably, an interlayer is fixedly connected to the lower end of the side surface of the plastic bag body.

[0013] Beneficial effects

[0014] The utility model provides a heat-sealed plastic bag. Compared with the prior art, it has the following advantages:

[0015] 1. In the present invention, the tearing structure is provided. When the inner product is heat-sealed and packaged in a heat-sealed plastic bag, heat sealing is performed by the heat-sealing line, and secondary sealing is performed by the tooth-shaped seal, thereby ensuring the sealing of the product during transportation. When the user needs to tear the heat-sealed plastic bag, the heat-sealing line and one end of the reinforcing rib are torn vertically to achieve the purpose of opening the first layer of the sealing structure of the plastic bag. The tooth-shaped seal can then be opened manually. At the same time, the notch torn along the through hole will not be directly disconnected. The notch will be connected to the plastic bag body by the other end of the reinforcing rib, thereby preventing the user from throwing the torn notch away and causing environmental pollution.

[0016] 2. In the present invention, the inner layer is provided, which is in direct contact with food and is non-toxic, odorless and corrosion-resistant, thus ensuring the safety and hygiene of food. At the same time, the inner layer made of biodegradable polylactic acid can be composted to reduce environmental pollution. At the same time, the waterproof layer made of nano-silicon oxide can enhance the waterproof performance of the plastic bag, prevent water penetration, and keep food fresh and dry. Silicon oxide has good chemical stability and can effectively resist corrosive substances such as acid and alkali. The heat-insulating layer made of graphene nanofiber has good thermal conductivity. This layer of material can maintain the temperature of food, whether it is refrigerated or hot. At the same time, graphene has excellent strength and conductivity, which can improve the overall performance of plastic bags; through the setting of the reinforcement layer, the reinforcement layer of plant cellulose nanofiber material increases the strength and durability of the plastic bag, preventing the plastic bag from breaking or being damaged during use, and the plant cellulose nanofiber can be obtained from natural plant sources, with good biocompatibility and degradability; through the setting of the outer layer, the outer layer of UV-resistant polyester film material protects the inner layer, preventing the plastic bag from being damaged by the external environment, such as friction, collision, etc. At the same time, the UV-resistant polyester film can prevent ultraviolet rays from irradiating food and extend the shelf life of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an axonometric drawing of a heat-sealed plastic bag proposed in the present utility model;

[0018] Figure 2 This is a three-dimensional schematic diagram of a heat-sealed plastic bag proposed by the present invention from another angle;

[0019] Figure 3 This is a cross-sectional view of a plastic bag body in a heat-sealed plastic bag proposed in the present invention;

[0020] Figure 4 A heat-sealed plastic bag proposed by the utility model Figure 3 Enlarged view of point A in the middle.

[0021] Legend:

[0022] 1. Plastic bag body; 101. Inner layer; 102. Waterproof layer; 103. Insulation layer; 104. Reinforcement layer; 105. Outer layer; 2. Handle structure; 201. Hot melt adhesive; 202. Reinforced handle; 3. Tear structure; 301. Through hole; 302. Heat sealing line; 303. Reinforcement rib; 4. Tooth-shaped seal; 5. Interlayer. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 4 , the utility model provides two technical solutions, specifically including the following embodiments:

[0025] Example 1:

[0026] A heat-sealed plastic bag comprises a plastic bag body 1, which comprises an inner layer 101, a waterproof layer 102, a heat-insulating layer 103, a reinforcement layer 104 and an outer layer 105. The outer side of the inner layer 101 is hot-melt-bonded with the waterproof layer 102, the outer side of the waterproof layer 102 is hot-melt-bonded with the heat-insulating layer 103, the outer side of the heat-insulating layer 103 is hot-melt-bonded with the reinforcement layer 104, and the outer side of the reinforcement layer 104 is hot-melt-bonded with the outer layer 105. The layers are adhered to each other by hot-melt technology. A tear structure 3 is provided at the upper end of the side surface of the plastic bag body 1. The tear structure 3 comprises a through hole 301 and a heat-sealing line 302. A reinforcing rib 303 is fixedly connected to the upper end of the side surface of the plastic bag body 1. The lower end of the reinforcing rib 303 is provided with a heat-sealing line 302. The heat sealing line 302 can perform heat sealing on the plastic bag body 1 to ensure the sealing of the internal space of the plastic bag body 1 during product transportation. Several through holes 301 are opened through the surface of one end of the heat sealing line 302 and the reinforcing rib 303. The through holes 301 are arranged in a U shape. The lower end of the heat sealing line 302 is provided with a toothed seal 4. The toothed seal 4 is provided on the outer surface of the plastic bag body 1. Pressing the toothed seal 4 can perform secondary sealing on the plastic bag body 1. The material of the inner layer 101 is biodegradable polylactic acid, the material of the waterproof layer 102 is nano-silicon oxide, the material of the heat insulating layer 103 is graphene nanofiber, the material of the reinforcing layer 104 is plant cellulose nanofiber, and the material of the outer layer 105 is UV-resistant polyester film.

[0027] During use, the packaging is heat-sealed using the tearing structure 3, with the heat-sealing line 302 providing the primary seal, and the serrated seal 4 providing the secondary seal, ensuring a tight seal during transport. When the user needs to open the plastic bag, they tear along the dotted line of the through-hole 301. This tearing will vertically sever the heat-sealing line 302 and one end of the reinforcing rib 303, effectively opening the primary sealing structure. The serrated seal 4 can then be manually opened. Furthermore, the notch created along the through-hole 301 does not break directly; instead, the other end of the reinforcing rib 303 connects the notch to the plastic bag body 1, preventing the user from discarding the torn notch and potentially causing environmental pollution. The inner layer 101, which comes into direct contact with food, is non-toxic, odorless, and corrosion-resistant, ensuring food safety and hygiene. It is also compostable, reducing environmental pollution. The waterproof layer 102 is made of nano-silicon oxide, enhancing waterproof properties and preventing moisture penetration, keeping food fresh and dry. The thermal insulation layer 103 is made of graphene nanofibers, offering excellent thermal conductivity and maintaining food temperature. The reinforcing layer 104 is made of plant cellulose nanofiber to increase the strength and durability of the plastic bag. The outer layer 105 is made of UV-resistant polyester film to protect the inner layer, prevent the plastic bag from being damaged by the external environment, and prevent ultraviolet rays from irradiating the food, thereby extending the shelf life of the food.

[0028] Example 2:

[0029] On the basis of Example 1, the upper ends of both side surfaces of the plastic bag body 1 are provided with a handle structure 2, and the handle structure 2 includes a hot melt adhesive 201 and a reinforced handle 202. The reinforced handle 202 is fixedly connected to the upper ends of both side surfaces of the plastic bag body 1 by the hot melt adhesive 201. The reinforced handle 202 facilitates the use of the plastic bag by hand. The lower ends of the side surfaces of the plastic bag body 1 are fixedly connected to an interlayer 5. A label or the like can be placed inside the interlayer 5 to facilitate identification of the product inside the heat-sealed plastic bag.

[0030] The product is placed in the plastic bag 1, which is sealed initially by the tear structure 3 and heat seal line 302. The second seal is then achieved by the toothed seal 4, ensuring a tight seal during transport. To carry the bag, the handles 2 on both sides facilitate carrying. To identify the product inside the bag, a label can be placed inside the interlayer 5 for easy viewing and identification.

[0031] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the scope of protection of the present application.

Claims

1. A heat-sealed plastic bag, comprising a plastic bag body (1), characterized in that: The plastic bag body (1) comprises an inner layer (101), a waterproof layer (102), a heat-insulating layer (103), a reinforcement layer (104) and an outer layer (105); the outer side of the inner layer (101) is hot-melt-bonded with the waterproof layer (102); the outer side of the waterproof layer (102) is hot-melt-bonded with the heat-insulating layer (103); the outer side of the heat-insulating layer (103) is hot-melt-bonded with the reinforcement layer (104); the outer side of the reinforcement layer (104) is hot-melt-bonded with the outer layer (105); and a tear-off device is provided on the upper end of the side surface of the plastic bag body (1). The tear structure (3) comprises a through hole (301) and a heat-sealing line (302); a reinforcing rib (303) is fixedly connected to the upper end of the side surface of the plastic bag body (1); a heat-sealing line (302) is provided at the lower end of the reinforcing rib (303); a plurality of through holes (301) are penetrated through one end surface of the heat-sealing line (302) and the reinforcing rib (303); a tooth-shaped seal (4) is provided at the lower end of the heat-sealing line (302); and the tooth-shaped seal (4) is provided on the outer surface of the plastic bag body (1).

2. A heat-sealable plastic bag according to claim 1, characterized in that: The material of the inner layer (101) is biodegradable polylactic acid.

3. The heat-sealed plastic bag according to claim 1, characterized in that: The material of the waterproof layer (102) is nano-scale silicon oxide.

4. The heat-sealable plastic bag according to claim 1, characterized in that: The material of the heat insulation layer (103) is graphene nanofiber.

5. The heat-sealable plastic bag according to claim 1, characterized in that: The material of the reinforcement layer (104) is plant cellulose nanofiber.

6. The heat-sealable plastic bag according to claim 1, characterized in that: The outer layer (105) is made of a UV-resistant polyester film.

7. The heat-sealable plastic bag according to claim 1, characterized in that: The upper ends of both side surfaces of the plastic bag body (1) are provided with a handle structure (2), the handle structure (2) comprising a hot melt adhesive (201) and a reinforced handle (202), and the reinforced handle (202) is fixedly connected to the upper ends of both side surfaces of the plastic bag body (1) via the hot melt adhesive (201).

8. The heat-sealable plastic bag according to claim 1, characterized in that: The lower end of the side surface of the plastic bag body (1) is fixedly connected with an interlayer (5).

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