A kraft paper packaging bag with adjustable inner cavity

Abstract

The utility model relates to packing material technical field especially is a kraft paper packing bag with adjustable inner cavity, including bag body, the four corners of bag body inner cavity all have the vertical fixed adhesion vertical pole, still be provided with four horizontal poles in bag body, and the both ends of four horizontal poles are perpendicular fixed with corresponding vertical pole, the utility model discloses a rigid framework that is composed of vertical pole, vertical rod and horizontal pole is set up in the bag body, and the slideable baffle is installed in the sliding hole of horizontal pole, so that user can according to the size and quantity of the contained article, and the flexible sliding baffle is used to divide the different size sub -space, especially key is, through the rotation knob drive extrusion strip downward movement, can simultaneously, all baffle sliding blocks are pressed tightly, firmly lock in the current position, this solved the background art mentioned baffle easy displacement, the problem of unreliable separation, provides the excellent protection for fragile, easy collision article, greatly reduces the damage risk in the transportation process.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, specifically to a kraft paper packaging bag with an adjustable inner cavity. Background Technology

[0002] Kraft paper packaging bags are widely used in the packaging of retail, takeaway, gifts, and industrial products due to their environmentally friendly, biodegradable, low-cost, and durable characteristics. However, existing kraft paper packaging bags have significant shortcomings in terms of functionality and adaptability.

[0003] First, the interior of a traditional kraft paper bag is a single, undivided space. When multiple items need to be placed at the same time, especially fragile, easily damaged, or irregularly shaped items (such as bottled beverages, cosmetics, electronic accessories, etc.), all items will be squeezed and collided with each other during transportation, which can easily lead to damage to the items or breakage of the packaging bag due to excessive local stress. Although there are solutions on the market that use independent cardboard dividers inside the bag, these dividers are separate from the bag body and are prone to shifting or tipping over when items are put in, failing to provide stable and reliable separation and protection, resulting in a poor user experience. Finally, existing internal partition solutions lack flexibility and reliability. Some designs have attempted sliding partitions, but these lack an effective fixing mechanism after sliding to the predetermined position. During handling and transportation, the partitions may slide on their own due to vibration, thus losing their partitioning function. There is an urgent need in the market for a packaging bag solution that can flexibly adjust the partition size according to the volume and shape of the contents and can firmly lock the partitions in any position.

[0004] Therefore, the present invention aims to solve one or more of the above-mentioned technical problems and provide a kraft paper packaging bag with a stable structure, a flexible adjustable inner cavity, and reliable fixation. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a kraft paper packaging bag with an adjustable inner cavity. This packaging bag has a stable supporting frame and a flexibly adjustable and lockable partition system, which can effectively protect the contents and improve the overall strength and reusability of the packaging bag.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable kraft paper packaging bag includes a bag body. Vertical rods are fixedly glued to the four corners of the inner cavity of the bag body. Four horizontal rods are also provided in the bag body. The two ends of the four horizontal rods are respectively fixed perpendicularly to the corresponding vertical rods. The top of each of the four horizontal rods has a sliding hole extending through the bottom. Several partitions are provided in the bag body, which are parallel to the vertical rods. Slider blocks are fixedly installed at the four corners of the partitions. The four slider blocks are slidably installed in the corresponding sliding holes. Extrusion strips are slidably installed in each of the four sliding holes, which simultaneously press and abut against the multiple slider blocks.

[0007] Preferably, each of the two opposite outer walls of the bag body has two handle holes extending through the inner cavity, and a protective inner liner is embedded and fixedly installed in each of the two handle holes. This protective inner liner can be made of more wear-resistant materials such as plastic or metal, effectively preventing tearing at the handle.

[0008] Preferably, the bag body is also provided with four vertical rods, the two ends of the four vertical rods are respectively fixed perpendicularly to the corresponding vertical rods, and the four horizontal rods are distributed in a rectangular array.

[0009] Preferably, the four vertical bars, four longitudinal bars, and four transverse bars together form a rectangular frame structure to support the bag body. This frame greatly enhances the bag body's resistance to pressure and impact.

[0010] Preferably, a compression fixing assembly is provided directly above the two upper crossbars, and the compression strip belongs to the compression fixing assembly.

[0011] Preferably, the extrusion fixing assembly further includes a fixing strip that is fixedly installed between the two vertical bars and distributed parallel to the extrusion strip.

[0012] Preferably, both extrusion bars are threaded through with threaded shafts, and a limit ring is fixedly installed on the top of the threaded shaft. A limit groove is provided in the center of the fixed bar to facilitate the rotation and installation of the limit ring.

[0013] Preferably, each of the two fixing strips has a knob at its top that is fixedly connected to the threaded shaft, and each of the two extrusion strips has a T-shaped guide rod that passes through the corresponding fixing strip vertically fixed at its top.

[0014] The beneficial effects of this utility model are as follows: This invention features a rigid frame consisting of vertical, longitudinal, and transverse bars inside the bag, with slidable partitions installed in the sliding holes of the transverse bars. This allows users to flexibly slide the partitions to create sub-spaces of different sizes based on the size and quantity of the items being stored. Crucially, rotating a knob drives the compression bar downwards, simultaneously and at once pressing all the partition sliders and locking them securely in their current positions. This solves the problems of easy partition displacement and unreliable separation mentioned in the prior art, providing excellent protection for fragile and easily impacted items and greatly reducing the risk of damage during transportation. The square frame structure in this invention plays a core supporting role. It acts like a built-in "scaffolding" to evenly distribute the load-bearing pressure, so that the weak bag body no longer bears all the pressure alone. This greatly improves the packaging bag's resistance to pressure and deformation. This allows the packaging bag to use relatively low-grammage kraft paper without sacrificing strength, achieving a balance between cost and performance, and significantly improving the reusability of the packaging bag. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the protective inner liner structure of this utility model; Figure 3 This is a schematic diagram of the square frame structure of this utility model; Figure 4 This is a schematic diagram of the extrusion and fixing structure of the partition and extrusion strip of this utility model; Figure 5 This is a schematic diagram of the lifting and sliding structure of the extrusion strip of this utility model.

[0016] In the picture: 1. Bag body; 11. Protective inner lining ring; 2. Vertical bar; 21. Longitudinal bar; 22. Horizontal bar; 23. Sliding hole; 3. Partition; 31. Sliding block; 41. Fixing strip; 42. Extrusion strip; 43. Threaded shaft; 44. Knob; 45. T-shaped guide rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0019] For examples, please refer to Figure 1-5 This utility model provides a technical solution: An adjustable kraft paper packaging bag includes a bag body 1. Two handle holes are provided on the two opposite outer walls of the bag body 1 through the inner cavity. A protective inner liner ring 11 is embedded and fixedly installed in each of the two handle holes. The protective inner liner ring 11 is made of wear-resistant engineering plastic. Its function is to strengthen the structural strength of the handle hole edge, prevent the kraft paper material of the bag body 1 from tearing due to stress concentration when carrying heavy objects, and significantly improve the durability and reusability of the packaging bag. Vertical rods 2 are vertically fixed and glued to the four corners of the inner cavity of the bag body 1. Four longitudinal rods 21 are also provided inside the bag body 1. The two ends of the four longitudinal rods 21 are respectively fixed vertically to the corresponding vertical rods 2. Four horizontal rods 22 are distributed in a rectangular array. Four horizontal rods 22 are also provided inside the bag body 1. The two ends of the four horizontal rods 22 are respectively fixed vertically to the corresponding vertical rods 2. The four vertical rods 21 and the four horizontal rods 22 together form a square frame structure for supporting the bag body 1. This frame structure is assembled by die-cutting and creasing high-strength corrugated cardboard or hard kraft paperboard. Its core function is to serve as the main load-bearing frame, providing three-dimensional support for the bag body 1 and preventing it from collapsing or deforming when bearing weight or stacking, thereby protecting the contents. The top of each of the four crossbars 22 has a sliding hole 23 extending through the bottom. The sliding hole 23 is a long strip-shaped through hole with a smooth inner wall, providing a smooth sliding track for the slider 31. At the same time, its cross-sectional size is slightly larger than that of the slider 31, ensuring that there is no interference during sliding and that it can provide sufficient contact area to generate effective friction when under pressure. The bag body 1 is equipped with several partitions 3 arranged parallel to the vertical rods 2. The partitions 3 are made of kraft paperboard with the same or similar weight as the frame. Their function is to flexibly divide the large internal space of the bag body 1 into multiple independent sub-spaces, so as to realize the classified storage of items and prevent them from colliding with each other during transportation. Each of the four corners of the partitions 3 is fixedly installed with a slider 31. The slider 31 is a rectangular block, injection molded from high-density plastic. Its bottom is bonded to the partition 3 and its top is embedded in the sliding hole 23. Its function is to replace the direct friction between the partition 3 body and the sliding hole 23, reduce sliding resistance and improve wear resistance. The four sliders 31 are slidably installed in the corresponding sliding holes 23. Above the two horizontal bars 22, there are compression fixing components. The compression fixing components include compression strips 42 that are lifted and slidably installed in the sliding holes 23 and simultaneously compress and abut against multiple sliders 31. The compression strips 42 are long strip components with rectangular cross sections and are made of hard plastic. When they are driven to move downward, they can be embedded in all the sliding holes 23 at the same time and evenly press the upper surface of all the sliders 31, thereby achieving synchronous locking of all the partitions 3 through friction. The extrusion fixing assembly also includes a fixing strip 41 fixedly installed between the two vertical rods 2 and distributed parallel to the extrusion strips 42. The fixing strip 41 serves as the mounting base and load-bearing foundation of the extrusion fixing assembly. Its two ends are fixed to the vertical rods 2 by slots or adhesive, providing a stable rotation fulcrum for the threaded shaft 43. The threaded shaft 43 is threaded through both extrusion strips 42. A limit ring is fixedly installed on the top of the threaded shaft 43. A limit groove is opened in the center of the fixing strip 41 to facilitate the rotation of the limit ring. The limit groove allows the limit ring to rotate freely within it but restricts its axial movement, thereby converting the rotational motion of the threaded shaft 43 into the linear lifting motion of the extrusion strips 42. The top of each fixing strip 41 is provided with a knob 44 fixedly connected to the threaded shaft 43. The surface of the knob 44 is provided with anti-slip texture, which is convenient for users to operate by hand. Its function is to serve as a drive input end, providing users with a labor-saving and precise control method. Two extrusion strips 42 are vertically fixed at their tops with T-shaped guide rods 45 that pass through the corresponding fixing strips 41. A small gap exists between the rod portion of the T-shaped guide rod 45 and the guide hole on the fixing strip 41. This gap is sufficient to allow the guide rod to slide freely, but small enough to prevent significant tilting of the extrusion strips 42 under pressure. Furthermore, a compression spring can be fitted onto the T-shaped guide rod 45, with both ends of the spring abutting against the fixing strip 41 and the extrusion strip 42 respectively. When the knob 44 is not tightened, the preload of the spring allows the extrusion strip 42 to automatically remain in the raised position, facilitating adjustment of the partition 3 and improving ease of use. The thickness of slider 31 only occupies half the depth of the corresponding sliding hole 23, while the bottom ends of the two threaded shafts 43 extend into the corresponding sliding holes 23 respectively, but never contact slider 31. There is no need to set a stop at the bottom of the threaded shaft 43 to prevent the extrusion strip 42 from disengaging, because when the knob 44 is rotated, the threaded shaft 43 rotates, eventually causing the extrusion strip 42 to press against several sliders 31.

[0020] The core working process of the adjustable-cavity kraft paper packaging bag of the present invention mainly revolves around the flexible partitioning and stable fixation of the inner cavity space, and the specific steps are as follows: Step 1: Initial State and Preparation When the packaging bag is in its initial empty state, the square frame inside, consisting of vertical rods 2, longitudinal rods 21 and horizontal rods 22, provides basic support for the bag body 1, enabling it to maintain its upright shape. Multiple partitions 3 are slidably installed in the sliding holes 23 opened in the two horizontal rods 22 above through sliders 31 at their corners. When not fixed, these partitions 3 can slide freely along the sliding holes 23. Step 2: Adjusting the internal cavity space According to the quantity, volume and shape of the items to be packaged, the user can manually slide each partition 3. Since the slider 31 slides smoothly in the sliding hole 23, the partition 3 can be easily moved to any horizontal position inside the bag body 1. By arranging and combining different partition 3 positions, the user can flexibly divide the inner cavity of the bag body 1 into multiple sub-spaces of different sizes and layouts to meet the personalized needs of packaging, isolating and protecting different items. This process realizes the stepless adjustment function of the inner cavity of the packaging bag. Step 3: Lock the partition at position 3 After all the partitions 3 are adjusted to the ideal position, they need to be fixed to prevent them from shifting during transportation. At this time, the user rotates the knob 44 installed on the top of the fixing strip 41. The rotation of the knob 44 drives the threaded shaft 43 fixedly connected to it to rotate synchronously. Since the threaded shaft 43 and the extrusion bar 42 are connected by a threaded connection, and the limiting ring at the top of the threaded shaft 43 is restricted to the limiting groove of the fixed bar 41 and can only rotate but not move axially, when the threaded shaft 43 rotates, it will drive the extrusion bar 42 to move downward in the vertical direction. In order to ensure that the extrusion bar 42 rises and falls smoothly without deflection, the T-shaped guide rod 45 at its top slides down synchronously in the guide hole of the fixed bar 41. As the extrusion bar 42 moves downward, its bottom eventually presses into the sliding holes 23 of all the crossbars 22 simultaneously, and makes extrusion contact with the upper surfaces of all the sliders 31 in the sliding holes 23. By continuously rotating the knob 44, the downward pressure applied by the extrusion bar 42 continues to increase, and through friction, all the sliders 31 are firmly pressed into the bottom of the sliding holes 23, thereby achieving the purpose of locking the positions of all partitions 3 at one time and simultaneously.

[0021] Step 4: Use and Reset Once the partition 3 is securely locked, the user can place items into the pre-divided sub-spaces. After filling the bag, the user can close the bag opening for carrying or transporting. The protective inner lining 11 at the handle of the packaging bag can effectively distribute stress and prevent the bag body 1 from tearing. When it is necessary to remove items or readjust the internal partitions, simply rotate the knob 44 in the opposite direction to drive the extrusion bar 42 to rise, releasing the pressure on the slider 31. All partitions 3 will immediately return to a sliding state, ready for the next adjustment and fixation. The entire process is simple, efficient and reliable, greatly improving the functionality and user experience of the packaging bag.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kraft paper packaging bag with an adjustable inner cavity, comprising a bag body (1), characterized in that: Vertical rods (2) are vertically fixed and glued to the four corners of the inner cavity of the bag body (1). Four horizontal rods (22) are also provided inside the bag body (1). The two ends of the four horizontal rods (22) are respectively fixed vertically to the corresponding vertical rods (2). The top of the four horizontal rods (22) is provided with a sliding hole (23) through the bottom. Several partitions (3) are provided inside the bag body (1) and are distributed parallel to the vertical rods (2). Slider blocks (31) are fixedly installed at the four corners of the partitions (3). The four sliders (31) are slidably installed in the corresponding sliding holes (23). The four sliding holes (23) are all equipped with pressing strips (42) that simultaneously press and abut against the multiple sliders (31).

2. The kraft paper packaging bag with adjustable inner cavity according to claim 1, characterized in that: The bag body (1) has two handle holes on its two opposite outer walls that penetrate the inner cavity. Protective inner lining rings (11) are embedded and fixedly installed in the two handle holes respectively.

3. The kraft paper packaging bag with adjustable inner cavity according to claim 1, characterized in that: The bag body (1) is also provided with four vertical rods (21), the two ends of the four vertical rods (21) are respectively fixed vertically to the corresponding vertical rods (2), and the four horizontal rods (22) are distributed in a rectangular array.

4. The kraft paper packaging bag with adjustable inner cavity according to claim 3, characterized in that: The four vertical bars (2), four longitudinal bars (21), and four transverse bars (22) together form a square frame structure for supporting the bag body (1).

5. The kraft paper packaging bag with adjustable inner cavity according to claim 1, characterized in that: An extrusion fixing assembly is provided directly above the two horizontal bars (22) located above, and the extrusion strip (42) belongs to the extrusion fixing assembly.

6. A kraft paper packaging bag with an adjustable inner cavity according to claim 5, characterized in that: The extrusion fixing assembly also includes a fixing strip (41) that is fixedly installed between the two vertical rods (2) and distributed parallel to the extrusion strip (42).

7. A kraft paper packaging bag with an adjustable inner cavity according to claim 6, characterized in that: Both extrusion bars (42) are threaded through with threaded shafts (43), and a limit ring is fixedly installed on the top of the threaded shafts (43). A limit groove is provided in the center of the fixing bar (41) to facilitate the rotation and installation of the limit ring.

8. A kraft paper packaging bag with an adjustable inner cavity according to claim 7, characterized in that: The top of each of the two fixing bars (41) is provided with a knob (44) that is fixedly connected to the threaded shaft (43), and the top of each of the two extrusion bars (42) is respectively vertically fixed with a T-shaped guide rod (45) that passes through the corresponding fixing bar (41).

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