High-strength environment-friendly plastic bag

Abstract

The utility model relates to the technical field of packaging materials, and discloses a high-strength environment-friendly plastic bag which comprises a bag body, a degradable coating is fixedly connected to the outer wall of the bag body, reinforcing ribs are fixedly connected to the inner wall of the bag body, a thickened curled edge is fixedly connected to the top of the outer wall of the bag body, an inner groove is formed in the inner wall of the thickened curled edge, and the reinforcing ribs are fixedly connected to the inner wall of the bag body. An inner ring is fixedly connected to the inner wall of the inner groove, elastic ribs are fixedly connected to the inner wall of the inner ring, and a draining mechanism is arranged at the bottom of the bag body. According to the plastic bag, the reinforcing ribs made of the PLA-based composite materials are attached to the inner wall of the bag body in a latticed mode, so that when the plastic bag bears heavy objects, the tensile force can be evenly dispersed, stress concentration is prevented, the defect that a traditional plastic bag is insufficient in strength is effectively overcome, the overall strength is enhanced, and meanwhile the plastic bag is convenient to use. The bag body is prepared by mixing polylactic acid and polyhydroxyalkanoate, and the degradable coating is made of a waterborne polyurethane material, so that the plastic bag has the degradable characteristic.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, and in particular to a high-strength environmentally friendly plastic bag. Background Technology

[0002] Plastic bags are the most common plastic products in daily life. Made of polyethylene or polyvinyl chloride, they are lightweight, flexible, transparent or colored, and have excellent waterproof and moisture-proof properties. They are convenient for holding various goods in shopping scenarios and can effectively extend the shelf life of food and ensure its freshness in the food packaging industry. However, their chemical structure is stable, and natural degradation takes hundreds of years. The accumulation of large amounts of discarded plastic bags not only pollutes soil and water sources but also threatens the survival of wild animals. Today, with the improvement of environmental awareness, biodegradable plastic bags have emerged. This innovative measure is expected to meet the needs of use while alleviating the environmental pressure caused by plastic bags and promoting sustainable development.

[0003] Patent publication number CN206599090U discloses a plastic bag and its usage method, including a bag body with an opening. A strip-shaped handle and a receiving cavity for accommodating the handle are provided on the edge of the opening. Both ends of the handle are fixedly connected to the bag body. An opening for pulling out the handle is provided on the outer wall of the receiving cavity. When the opening is fully open, the handle is straightened and completely inserted into the receiving cavity. Since both ends of the handle are fixed to the bag body, the handle is straightened and retracted into the receiving cavity as the opening is fully opened. If the user needs to carry the plastic bag, they can simply pull the handle out through the opening. The handle retraction and release can be switched. However, its mechanical strength is low, making it difficult to meet the demands of high-intensity use. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a high-strength environmentally friendly plastic bag, which aims to improve the problem that the existing technology has low mechanical strength and cannot meet the requirements of high-strength use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-strength environmentally friendly plastic bag, comprising a bag body, a biodegradable coating fixedly connected to the outer wall of the bag body, reinforcing ribs fixedly connected to the inner wall of the bag body, a thickened rolled edge fixedly connected to the top of the outer wall of the bag body, an inner groove provided on the inner wall of the thickened rolled edge, an inner ring fixedly connected to the inner wall of the inner groove, an elastic rib fixedly connected to the inner wall of the inner ring, and a drainage mechanism provided at the bottom of the bag body.

[0006] Through the above technical solutions: the biodegradable coating gives the plastic bag environmental protection properties, reducing harm to the environment; the reinforcing ribs enhance the overall strength of the plastic bag and prevent it from breaking due to excessive force; the thickened rolled edge improves the strength of the bag opening and avoids tearing when lifting heavy objects; the inner groove, inner ring and elastic ribs work together to make it easy to fix the plastic bag to the container.

[0007] As a further description of the above technical solution:

[0008] The draining mechanism includes an inner bottom of the bag, the outer wall of which is fixedly connected to the bottom of the inner wall of the bag body. The top of the inner bottom of the bag has multiple water outlet holes. The bottom front and rear sides of the inner bottom of the bag are fixedly connected to outer bottoms of the bag. Tear strips are fixedly connected to adjacent sides of the outer walls of the two outer bottoms of the bag. Tear lines are provided on the outer walls of the two outer bottoms of the bag. A flap is fixedly connected to the left side of the outer wall of the tear strip.

[0009] The above technical solution allows the inner bottom of the bag to collect accumulated water, while the drainage hole allows the water to flow into the outer bottom of the bag. The tear strips, tear lines, and flaps work together to make it easy for users to open the drainage channel and achieve convenient drainage.

[0010] As a further description of the above technical solution:

[0011] The top left and right sides of the thickened rolled edge are provided with rope grooves, and the inner walls of the two rope grooves are fixedly connected with reinforced sealing edges.

[0012] The above technical solution provides installation and concealment space for tightening the pull rope, and reinforces the sealing edge to enhance the structural strength of the rope groove, preventing it from being damaged due to friction or stress from the pull rope.

[0013] As a further description of the above technical solution:

[0014] Both elastic ribs have slidably connected tension ropes to their inner walls, and the two rope grooves are designed symmetrically.

[0015] Through the above technical solution: the tightening drawstring can adjust the size of the bag opening with the help of the elastic ribs, so as to achieve stable storage of the items inside the bag. The symmetrical design of the drawstring groove makes the tightening drawstring evenly stressed, ensuring the stability of the bag opening closure.

[0016] As a further description of the above technical solution:

[0017] The thickness of the biodegradable coating is set to 0.05-0.1 mm, and the thickness of the reinforcing rib is set to 0.1-0.2 mm.

[0018] Through the above technical solution: the thickness of the biodegradable coating is set to 0.05-0.1mm, preferably 0.1mm. This thickness of biodegradable coating can form a relatively complete protective layer to resist the erosion of the bag body by the external environment. The thickness of the reinforcing rib is set to 0.1-0.2mm, preferably 0.2mm. When the thickness of the reinforcing rib reaches 0.2mm, its own structural strength is higher, and it can better play the role of dispersing tensile force when the plastic bag carries heavy objects.

[0019] As a further description of the above technical solution:

[0020] The grid spacing of the reinforcing ribs is set to 5-10mm, and handles are fixedly connected to the top, front and rear sides of the thickened rolled edge.

[0021] Through the above technical solution: the grid spacing of the reinforcing ribs is set to 5-10mm, with a preferred value of 8mm. The 8mm grid spacing achieves the best balance between the distribution density of the reinforcing ribs and the stress distribution effect, ensuring strength while maintaining a certain degree of flexibility in the bag body. The handle makes it convenient for users to lift the plastic bag and reduces hand burden.

[0022] As a further description of the above technical solution:

[0023] Both handles have hand grooves on their outer walls, and both handles have rounded outer walls.

[0024] The above technical solution achieves the following: the hand groove conforms to the contour of the hand, increasing the user's grip comfort, and the rounded treatment of the outer wall of the handle prevents its edges from scratching the hand.

[0025] As a further description of the above technical solution:

[0026] A waterproof layer is fixedly connected to the top center of the tear strip, and multiple water outlet holes are equidistantly opened at the top of the inner bottom of the bag.

[0027] The above technical solution ensures that the waterproof layer prevents water leakage at the bottom of the bag when the tear strip is not torn, keeping the surrounding environment dry, and the equidistant design of the water outlets ensures that the water inside the bag can be drained evenly and efficiently.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, by attaching reinforcing ribs made of PLA-based composite material in a grid pattern to the inner wall of the bag, the tensile force on the plastic bag can be evenly distributed when it bears heavy objects, preventing stress concentration. This effectively overcomes the shortcomings of insufficient strength in traditional plastic bags and enhances the overall strength. At the same time, the bag body is made of a mixture of polylactic acid and polyhydroxyalkanoate, and a biodegradable coating of water-based polyurethane material is used, which makes the plastic bag biodegradable, effectively reducing the harm to the environment and practicing the concept of environmental protection.

[0030] 2. In this utility model, by opening multiple water outlet holes at equal intervals at the top and bottom of the bag, when the tear strip is torn open, the water inside the bag can be quickly discharged to the outside of the bag through the water outlet holes under the action of gravity, so that the draining process of the items inside the bag is completed efficiently, meeting the user's needs for handling watery items. Attached Figure Description

[0031] Figure 1 This is a perspective view of a high-strength environmentally friendly plastic bag proposed in this utility model;

[0032] Figure 2 This is a partial structural cross-sectional view of a high-strength environmentally friendly plastic bag proposed in this utility model;

[0033] Figure 3 This is a cross-sectional view of a high-strength, environmentally friendly plastic bag with a thickened rolled edge, as proposed in this utility model.

[0034] Figure 4 This is a cross-sectional view of the body of a high-strength environmentally friendly plastic bag according to the present invention;

[0035] Figure 5 This is an exploded view of the drainage mechanism of a high-strength environmentally friendly plastic bag proposed in this utility model.

[0036] Legend:

[0037] 1. Bag body; 2. Drainage mechanism; 201. Inner bottom of the bag; 202. Drain hole; 203. Outer bottom of the bag; 204. Tear strip; 205. Tear line; 206. Flip flap; 3. Biodegradable coating; 4. Reinforcing ribs; 5. Thickened rolled edge; 6. Inner groove; 7. Inner ring; 8. Elastic rib; 9. Rope groove; 10. Reinforced edge sealing; 11. Tightening drawstring; 12. Handle; 13. Hand groove; 14. Waterproof layer. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] See attached document Figure 1 Appendix Figure 2 and attached Figure 3 An embodiment of this utility model is provided: a high-strength environmentally friendly plastic bag, including a bag body 1, a biodegradable coating 3 fixedly connected to the outer wall of the bag body 1, a reinforcing rib 4 fixedly connected to the inner wall of the bag body 1, a thickened rolled edge 5 fixedly connected to the top of the outer wall of the bag body 1, an inner groove 6 opened in the inner wall of the thickened rolled edge 5, an inner ring 7 fixedly connected to the inner wall of the inner groove 6, an elastic rib 8 fixedly connected to the inner wall of the inner ring 7, and a drainage mechanism 2 provided at the bottom of the bag body 1;

[0040] Specifically, the bag body 1 is the main structure, and its inner wall is attached with grid-like reinforcing ribs 4. When the plastic bag carries heavy objects, the reinforcing ribs 4 evenly distribute the tensile force on the bag body 1, avoid stress concentration, prevent the bag body 1 from tearing, and enhance the overall strength. The outer wall of the bag body 1 is provided with a biodegradable coating 3, which can resist external erosion, slow down the aging of the bag body 1, and extend its service life. The top of the outer wall of the bag body 1 is provided with a thickened rolled edge 5, which improves the strength of the top of the bag and prevents the bag opening from breaking when lifting heavy objects. The inner wall of the thickened rolled edge 5 has an inner groove 6, and an inner ring 7 and an elastic rib 8 are installed in the inner groove 6. The inner ring 7 enhances the structural stability of the thickened rolled edge 5 and provides support for the elastic rib 8. When the user puts the plastic bag into the container, the elastic rib 8, with its good elasticity, fits tightly against the outer wall of the container and prevents the bag body 1 from detaching from the inner wall of the container. The material of the bag body 1 is a blend of polylactic acid (PLA) and polyhydroxyalkanoate (PHA) in a ratio of 70:30. The biodegradable coating 3 is made of water-based polyurethane, and the reinforcing rib 4 is made of PLA-based composite material.

[0041] See attached document Figure 4 and attached Figure 5The drainage mechanism 2 includes an inner bottom 201, the outer wall of which is fixedly connected to the bottom of the inner wall of the bag body 1. The inner bottom 201 provides an initial receiving platform for water accumulated inside the bag. Multiple water outlets 202 are provided at the top of the inner bottom 201, allowing water to flow through to the outer bottom 203. Outer bottoms 203 are fixedly connected to the front and rear sides of the bottom of the inner bottom 201, catching water flowing out from the outlets 202 and preparing for subsequent drainage. Tear strips 204 are fixedly connected to adjacent sides of the outer walls of the two outer bottoms 203, providing an operating point for opening the drainage channel. The outer walls of both bag bottoms 203 are provided with tear lines 205. The tear lines 205 reduce the local structural strength of the bag bottoms 203 in advance, making it easier to tear the strip 204. A lifting piece 206 is fixedly connected to the left side of the outer wall of the tear strip 204. The lifting piece 206 provides a force point for the user to pull the tear strip 204. A waterproof layer 14 is fixedly connected to the top center of the tear strip 204. The waterproof layer 14 prevents water leakage at the connection of the bag bottoms 203 when the tear strip 204 is not torn. Multiple water outlets 202 are equidistantly opened at the top of the bag bottoms 201 to ensure that the water inside the bag can be discharged evenly and efficiently through the water outlets 202.

[0042] Specifically, when it is necessary to drain the contents of the bag, the operation can be completed through the draining mechanism 2. First, the user pinches the lifting piece 206 and pulls it away from the bag body 1. The lifting piece 206 drives the tear strip 204, causing the tear strip 204 to tear along the tear line 205 on the outer wall of the bag bottom 203. Because the tear line 205 reduces the structural strength of the bag bottom 203 in advance, the difficulty of tearing is greatly reduced. When the tear strip 204 is not torn, the waterproof layer 14 at the top center covers the connection of the bag bottom 203 to prevent water leakage. After the tear strip 204 is torn, the water in the bag gathers to the bottom of the bag body 1 under the action of gravity and contacts the bag bottom 201. Multiple water outlet holes 202 are evenly distributed on the top of the bag bottom 201. The water flows from the bag into the space formed by the bag bottom 201 and the bag bottom 203 through the water outlet holes 202, and then drains out through the torn channel, finally achieving efficient drainage of the contents of the bag and meeting the user's drainage needs.

[0043] See attached document Figure 1 Appendix Figure 3 and attached Figure 4The top left and right sides of the thickened rolled edge 5 are provided with rope grooves 9. The rope grooves 9 provide installation and concealment space for the tightening pull rope 11, facilitating rope operation. The inner walls of both rope grooves 9 are fixedly connected with reinforced sealing edges 10. The reinforced sealing edges 10 enhance the structural strength of the rope grooves 9 and prevent damage due to rope friction or force. The inner walls of the two elastic ribs 8 are slidably connected with tightening pull ropes 11. The tightening pull ropes 11 can adjust the size of the bag opening, achieving stable storage of items inside the bag. The two rope grooves 9 adopt a symmetrical design, which ensures that the tightening pull ropes 11 are evenly stressed, guaranteeing the stability of the bag opening closure. The thickness of the biodegradable coating 3 is set to 0.05-0.1mm, and the thickness value of the biodegradable coating 3 is set to 0.1mm. The thickness can better resist external erosion and extend the service life of plastic bags. The thickness of the reinforcing rib 4 is set to 0.1-0.2mm, and the grid spacing of the reinforcing rib 4 is set to 5-10mm. The thickness and grid spacing of the reinforcing rib 4 are set to 0.2mm and 8mm respectively. This combination further enhances the load-bearing capacity and durability of plastic bags. The top, front and back sides of the thickened rolled edge 5 are fixedly connected to handles 12. The handles 12 make it convenient for users to lift plastic bags and reduce hand burden. The outer walls of the two handles 12 are provided with hand grooves 13. The hand grooves 13 fit the contour of the hand and increase the comfort of the user's grip. The outer walls of the two handles 12 are rounded to avoid the edges of the handles 12 from scratching the hands.

[0044] Specifically, the rope groove 9, reinforced edge sealing 10, and tightening drawstring 11 work together to not only provide space for the drawstring and strengthen the structure of the rope groove 9, but also flexibly adjust the size of the bag opening, stably close the bag opening, and achieve secure storage of items. The biodegradable coating 3 is 0.1mm thick, effectively resisting external corrosion and combining environmental protection and durability. The reinforcing rib 4 is 0.2mm thick with a mesh spacing of 8mm, which greatly enhances the load-bearing capacity and tear resistance of the plastic bag. The handle 12 on the thickened rolled edge 5 makes it easy to lift and reduces the burden on the user's hands. The hand groove 13 conforms to the contour of the hand, improves grip comfort, and its smooth treatment avoids the risk of scratches.

[0045] Working Principle: The bag body 1, as the main body of the plastic bag, is made of a material blended from polylactic acid (PLA) and polyhydroxyalkanoate (PHA) in a 70:30 ratio. This material is biodegradable, reducing environmental harm. The reinforcing ribs 4 on the inner wall of the bag body 1 are made of PLA-based composite material, attached in a mesh pattern. When the plastic bag bears heavy loads, the reinforcing ribs 4 evenly distribute the tensile force on the bag body 1. When heavy items are loaded, the mesh structure effectively prevents stress concentration, preventing the bag body 1 from tearing due to excessive localized stress, thus enhancing the overall strength of the bag. The biodegradable coating 3 on the outer wall of the bag body 1 is made of water-based polyurethane. During the process, the biodegradable coating 3 can resist the erosion of the external environment, slow down the aging rate of the bag body 1, and extend its service life. At the same time, the water-based polyurethane material is biodegradable and conforms to the concept of environmental protection. The thickened rolled edge 5 is set on the top of the outer wall of the bag body 1 to further enhance the strength of the top of the bag and prevent the bag mouth from breaking when lifting heavy objects. The inner groove 6 of the inner wall of the thickened rolled edge 5 provides installation space for the inner ring 7 and the elastic rib 8. The inner ring 7 enhances the structural stability of the thickened rolled edge 5 and provides support for the elastic rib 8. The elastic rib 8 has good elasticity. When the user needs to put the plastic bag in the container, the elastic rib 8 can tightly fit the outer wall of the container and prevent the bag body 1 from falling off the inner wall of the container.

[0046] Furthermore, when it is necessary to drain the contents of the bag, the draining mechanism 2 achieves an efficient and convenient draining process. First, the user pinches the flap 206 and slowly pulls it up in a direction away from the bag body 1. During this process, the flap 206 will drive the tear strip 204 connected to it to tear along the pre-set tear line 205 on the outer wall of the bag bottom 203. The tear line 205 reduces the structural strength of the bag bottom 203 at this point, thereby reducing the force required to tear it and making the operation easier. At the same time, the waterproof layer 14 at the top center of the tear strip 204 tightly covers the connection of the bag bottom 203 when the tear strip 204 is not torn, preventing water from leaking out of the bag in advance. When the tear strip 204 is successfully torn, the water in the bag gathers at the bottom of the bag body 1 under the action of gravity and comes into contact with the bag bottom 201. Since multiple water outlet holes 202 are equidistantly opened at the top of the bag bottom 201, the water flows out of the bag through these water outlet holes 202, achieving efficient draining of the contents of the bag.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, 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, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-strength environmentally friendly plastic bag, comprising a bag body (1), characterized in that: The outer wall of the bag body (1) is fixedly connected with a biodegradable coating (3), the inner wall of the bag body (1) is fixedly connected with a reinforcing rib (4), the top of the outer wall of the bag body (1) is fixedly connected with a thickened rolled edge (5), the inner wall of the thickened rolled edge (5) is provided with an inner groove (6), the inner wall of the inner groove (6) is fixedly connected with an inner ring (7), the inner wall of the inner ring (7) is fixedly connected with an elastic rib (8), and the bottom of the bag body (1) is provided with a drainage mechanism (2).

2. The high-strength environmentally friendly plastic bag according to claim 1, characterized in that: The draining mechanism (2) includes an inner bottom (201), the outer wall of which is fixedly connected to the bottom of the inner wall of the bag body (1). The top of the inner bottom (201) is provided with multiple water outlet holes (202). The bottom front and rear sides of the inner bottom (201) are fixedly connected with outer bottoms (203). The outer walls of the two outer bottoms (203) are fixedly connected with tear strips (204) on adjacent sides. The outer walls of the two outer bottoms (203) are provided with tear lines (205). The outer wall of the tear strips (204) is fixedly connected with a lifting piece (206) on the left side.

3. The high-strength environmentally friendly plastic bag according to claim 1, characterized in that: The top left and right sides of the thickened rolled edge (5) are provided with rope grooves (9), and the inner walls of the two rope grooves (9) are fixedly connected with reinforced sealing edges (10).

4. A high-strength environmentally friendly plastic bag according to claim 3, characterized in that: The inner walls of the two elastic ribs (8) are slidably connected with tightening ropes (11), and the two rope grooves (9) are symmetrically designed.

5. A high-strength environmentally friendly plastic bag according to claim 1, characterized in that: The thickness of the biodegradable coating (3) is set to 0.05-0.1 mm, and the thickness of the reinforcing rib (4) is set to 0.1-0.2 mm.

6. A high-strength environmentally friendly plastic bag according to claim 1, characterized in that: The grid spacing of the reinforcing rib (4) is set to 5-10mm, and the top, front and back sides of the thickened rolled edge (5) are fixedly connected with handles (12).

7. A high-strength environmentally friendly plastic bag according to claim 6, characterized in that: Both handles (12) have hand grooves (13) on their outer walls, and both handles (12) have rounded outer walls.

8. A high-strength environmentally friendly plastic bag according to claim 2, characterized in that: A waterproof layer (14) is fixedly connected to the top center of the tear strip (204), and a plurality of water outlet holes (202) are provided, which are equidistantly located at the top of the inner bottom (201) of the bag.

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