Reinforced base structure for polypropylene ton bag

Abstract

The utility model relates to packing technical field, concretely for a kind of polypropylene ton bag's reinforcing bottom structure, including outer bag, the inner bag is arranged in the outer bag, the outer bag and inner bag are oppositely side and are provided with connecting assembly, the outer bag surface is provided with support assembly, the support assembly includes metal strip one, the metal strip one left and right sides are fixedly connected in the outer bag surface, the outer bag surface is fixedly connected with two metal strip two, the metal strip one and metal strip two cross distribution, the connecting assembly includes support plate, the support plate is fixedly connected in the outer bag inner side, the support plate top side is fixedly connected with two bolts, the bolt penetrates the inner bag, in the utility model, through support assembly adaptation different goods distribution, realize the even dispersion of gravity, solve the defect of traditional fixed bottom stress concentration, realize the close fixing of outer bag and inner bag by connecting assembly, improve structural stability.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, specifically to a reinforced bottom structure for a polypropylene ton bag. Background Technology

[0002] Polypropylene bulk bags, also known as jumbo bags or space bags, are medium-sized bulk containers. With their advantages of large capacity, low cost, and easy loading and unloading, they are widely used in chemical, building materials, grain, and mining industries for transporting and storing ton-sized goods such as powders, granules, and lumps. In actual use, the bottom of the bulk bag is the core part that bears the weight of the goods, and its structural strength directly determines the safety and durability during transportation.

[0003] Existing polypropylene ton bags typically employ a single woven fabric stitched together or a simple bottom support, such as X-shaped or cross-shaped PP straps. While these designs can meet basic load-bearing requirements, they still have shortcomings when loading heavy goods weighing over 1.5 tons, such as ores or metal granules, or in scenarios involving repeated use. The fixed positions of traditional bottom support metal strips or PP straps prevent adjustment of support points according to cargo distribution, easily leading to stress concentration. Therefore, we propose a reinforced bottom structure for polypropylene ton bags. Utility Model Content

[0004] The purpose of this invention is to provide a reinforced bottom structure for a polypropylene ton bag to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A reinforced bottom structure for a polypropylene ton bag includes an outer bag, an inner liner inside the outer bag, a connecting component on one side of the outer bag and the inner liner, and a support component on the surface of the outer bag. The support component includes a metal strip one, which is fixedly connected to the surface of the outer bag on both the left and right sides. Two metal strips two are fixedly connected to the surface of the outer bag, and the metal strip one and metal strip two are distributed in a crisscross pattern.

[0007] Preferably, the connecting assembly includes a support plate, which is fixedly connected to the inside of the outer bag, and two bolts are fixedly connected to the top side of the support plate, the bolts penetrating the inner liner.

[0008] Preferably, two movable blocks are slidably connected to the surface of the first metal strip, the second metal strip passes through the movable blocks, a movable shaft is slidably connected inside the movable blocks, and a plurality of evenly distributed grooves are opened on the bottom side of the first metal strip, with one end of the movable shaft slidably connected inside the grooves.

[0009] Preferably, a push plate is fixedly connected to the surface of the movable shaft, a spring is fixedly connected to one side of the push plate, and the end of the spring away from the push plate is fixedly connected inside the movable block.

[0010] Preferably, the top side of the support plate is fixedly connected with a plurality of evenly distributed positioning pins, which penetrate the inner liner.

[0011] Preferably, two handles are fixedly connected to the surface of the outer bag.

[0012] Preferably, the inner liner surface is provided with a polyvinyl chloride wear-resistant coating.

[0013] Preferably, the surface of the polyvinyl chloride wear-resistant coating is provided with a polyethylene modified coating.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The reinforced bottom structure of this polypropylene ton bag adapts to different cargo distributions through the support components. Pulling the movable shaft allows the sliding blocks to move along metal strip one and metal strip two. After adjusting the position of the support point, the spring pushes the movable shaft to automatically engage with the groove and fix it, achieving uniform distribution of gravity and solving the defect of stress concentration in traditional fixed bottom supports, thus adapting to the load-bearing requirements of cargo of different weights.

[0016] 2. The reinforced bottom structure of this polypropylene ton bag achieves tight fixing between the outer bag and the inner liner through connecting components. The support plate provides basic support, and bolts and positioning pins together restrict the displacement of the inner liner, effectively avoiding bottom bulging and tearing caused by misalignment between the outer bag and the inner liner during cargo loading or handling, thus improving structural stability. Attached Figure Description

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

[0018] Figure 2 This is a schematic diagram of the outer bag structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the metal strip structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the movable block structure in this utility model;

[0021] Figure 5 This is a schematic diagram of the inner liner structure in this utility model.

[0022] In the diagram: 1. Outer bag; 2. Inner liner; 3. Connecting assembly; 301. Bolt; 302. Support plate; 303. Positioning pin; 4. Support assembly; 401. Metal strip one; 402. Metal strip two; 403. Moving block; 404. Push plate; 405. Moving shaft; 406. Spring; 5. Handle; 6. Polyethylene modified coating; 7. Polyvinyl chloride wear-resistant coating. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0024] 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.

[0025] Please see Figures 1-5 As shown, this utility model provides a technical solution:

[0026] A reinforced bottom structure for a polypropylene ton bag includes an outer bag 1, with an inner liner 2 inside. The outer bag 1 is made of polypropylene woven fabric to ensure basic strength; the inner liner 2 is a polypropylene blown film to prevent leakage of goods; a connecting component 3 is provided on one side of the outer bag 1 and the inner liner 2; a support component 4 is provided on the surface of the outer bag 1, the support component 4 including a metal strip 401, the left and right sides of the metal strip 401 are fixedly connected to the surface of the outer bag 1 by stitching, the stitching thread is made of high-strength polyester thread to enhance the connection firmness; two metal strips 402 are fixedly connected to the surface of the outer bag 1, the metal strips 402 and the metal strips 401 are distributed crosswise, and the intersection is fixed by metal buckles to prevent relative slippage.

[0027] In this embodiment, the connecting component 3 includes a support plate 302, which is fixedly connected to the inside of the outer bag 1 by hot melt bonding. The bonding area covers the entire bottom surface of the support plate 302, improving adhesion. Two bolts 301 are fixedly connected to the top side of the support plate 302. The bolts 301 are made of plastic and are integrally injection molded with the support plate 302. The bolts 301 penetrate the inner liner 2. The inner liner 2 has through holes with matching diameters at the positions of the bolts 301. The edges of the through holes are sealed by hot pressing to prevent tearing. After the bolts 301 penetrate, they are tightened with plastic nuts to tightly press the inner liner 2 onto the support plate 302.

[0028] In this embodiment, two movable blocks 403 are slidably connected to the surface of the first metal strip 401. The movable blocks 403 have cross-shaped through holes that match the first metal strip 401 and the second metal strip 402 to reduce sliding resistance. The second metal strip 402 passes through the movable blocks 403. A movable shaft 405 is slidably connected inside the movable blocks 403. A pull ring is provided at the top of the movable shaft 405 for easy manual pulling. The bottom side of the first metal strip 401 has multiple evenly distributed grooves with a width that matches the diameter of the movable shaft 405. One end of the movable shaft 405 is slidably connected inside the groove to lock the position of the movable blocks 403.

[0029] In this embodiment, a push plate 404 is fixedly connected to the surface of the movable shaft 405. The diameter of the push plate 404 is larger than the diameter of the movable shaft 405, which serves as a limit. A spring 406 is fixedly connected to one side of the push plate 404. The spring 406 is initially in a naturally extended state. The end of the spring 406 away from the push plate 404 is fixedly connected to the inside of the movable block 403. When the movable shaft 405 is pulled, the push plate 404 compresses the spring 406. After being released, the spring 406 resets and pushes the movable shaft 405 into the groove, thereby achieving automatic locking.

[0030] In this embodiment, a plurality of evenly distributed positioning pins 303 are fixedly connected to the top side of the support plate 302 in a ring shape; the positioning pins 303 penetrate the inner liner 2, and the inner liner 2 has positioning holes at corresponding positions. The cooperation between the positioning pins 303 and the positioning holes further restricts the circumferential rotation of the inner liner 2 and improves the coordination between the outer bag and the inner liner 2.

[0031] In this embodiment, two handles 5 are fixedly connected to the surface of the outer bag 1. The stitch length between the handles 5 and the outer bag 1 is ≥10cm. The stitching is done in a “Z” pattern to enhance tensile strength. The breaking strength of the handles 5 is ≥5kN, which meets the needs of manual handling.

[0032] In this embodiment, the inner liner 2 is provided with a polyvinyl chloride wear-resistant coating 7, which is prepared by a scraper coating process; the surface of the polyvinyl chloride wear-resistant coating 7 is provided with a polyethylene modified coating 6, and 0.5%-1% antioxidant is added to the polyethylene modified coating 6 to improve the aging resistance and extend the outdoor service life.

[0033] In this embodiment, the reinforced bottom structure of a polypropylene ton bag is used by first adjusting the support component 4 according to the weight and distribution of the goods to be loaded: manually pull the pull ring at the top of the moving shaft 405 upwards, the moving shaft 405 drives the push plate 404 to move upwards and compress the spring 406 until the bottom end of the moving shaft 405 is completely disengaged from the groove of the metal strip 401, at which point the moving block 403 is unlocked; slide the moving block 403 along the metal strip 401 and the metal strip 402 to the required support position. When loading concentrated heavy objects, adjust the moving block 403 downwards towards the heavy objects, release the pull ring, the spring 406 resets and pushes the push plate 404 and the moving shaft 405 downwards, the bottom end of the moving shaft 405 inserts into the corresponding groove, completing the fixation of the moving block 403 and achieving precise adjustment of the support point.

[0034] Next, the cargo is loaded: powdery, granular, or lumpy cargo is loaded into the inner liner 2 through the feed port at the top of the outer bag 1. During the loading process, the inner liner 2 remains relatively stationary with respect to the outer bag 1 under the fixing action of bolts 301 and positioning pins 303, to avoid misalignment caused by cargo impact. The weight of the cargo is transferred to the support plate 302 through the inner liner 2, and then distributed by the support plate 302 to the outer bag 1 and the support assembly 4. Metal strip 1 401, metal strip 2 402 and the moving block 403 jointly bear the weight to prevent excessive local stress at the bottom.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A reinforced bottom structure for a polypropylene ton bag, comprising an outer bag (1), characterized in that: The outer bag (1) is provided with an inner liner (2). A connecting component (3) is provided on the side of the outer bag (1) and the inner liner (2) facing each other. A support component (4) is provided on the surface of the outer bag (1). The support component (4) includes a metal strip (401). The metal strip (401) is fixedly connected to the surface of the outer bag (1) on both the left and right sides. Two metal strips (402) are fixedly connected to the surface of the outer bag (1). The metal strips (401) and (402) are distributed in a cross pattern.

2. The reinforced bottom structure of a polypropylene ton bag according to claim 1, characterized in that: The connecting component (3) includes a support plate (302), which is fixedly connected to the inside of the outer bag (1). Two bolts (301) are fixedly connected to the top side of the support plate (302), and the bolts (301) penetrate the inner liner (2).

3. The reinforced bottom structure of a polypropylene ton bag according to claim 1, characterized in that: Two movable blocks (403) are slidably connected to the surface of the first metal strip (401). The second metal strip (402) passes through the movable block (403). A movable shaft (405) is slidably connected inside the movable block (403). Multiple evenly distributed grooves are opened on the bottom side of the first metal strip (401). One end of the movable shaft (405) is slidably connected inside the groove.

4. The reinforced bottom structure of a polypropylene ton bag according to claim 3, characterized in that: A push plate (404) is fixedly connected to the surface of the moving shaft (405), and a spring (406) is fixedly connected to one side of the push plate (404). The end of the spring (406) away from the push plate (404) is fixedly connected to the inside of the moving block (403).

5. The reinforced bottom structure of a polypropylene ton bag according to claim 2, characterized in that: The top side of the support plate (302) is fixedly connected with a plurality of evenly distributed positioning pins (303), and the positioning pins (303) penetrate the inner liner (2).

6. The reinforced bottom structure of a polypropylene ton bag according to claim 1, characterized in that: The outer bag (1) has two handles (5) fixedly connected to its surface.

7. The reinforced bottom structure of a polypropylene ton bag according to claim 1, characterized in that: The inner liner (2) is provided with a polyvinyl chloride wear-resistant coating (7).

8. The reinforced bottom structure of a polypropylene ton bag according to claim 7, characterized in that: The surface of the polyvinyl chloride wear-resistant coating (7) is provided with a polyethylene modified coating (6).

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