A type of shock-absorbing pearl cotton

Abstract

This utility model belongs to the field of pearl cotton technology, and particularly relates to a shock-absorbing pearl cotton, comprising a bottom layer, a middle layer and a surface layer arranged sequentially on the bottom layer. The bottom layer, middle layer and surface layer present a gradient density layered structure, with the surface layer density being greater than the bottom layer density being greater than the middle layer density. The middle layer has an energy dissipation cavity inside, with the energy dissipation cavity having a higher distribution density in the geometric center region of the pearl cotton than in the edge region. The energy dissipation cavity is spherical. The surface layer has several micro-protrusion structures on its end face, which are arrayed cones integrally formed on the outer surface of the surface layer, forming guide grooves between the cones. The bottom layer has a honeycomb cavity inside, filled with elastic pillars, the upper and lower end faces of which are connected to the inner wall of the honeycomb cavity, respectively. Compared with the prior art, this utility model achieves a better overall shock absorption and protection effect and extends the service life.

Description

Technical Field

[0001] This utility model relates to the field of pearl cotton technology, and more specifically, to a shock-absorbing pearl cotton. Background Technology

[0002] Polyethylene foam, also known as EPE pearl cotton, is a non-crosslinked closed-cell structure and a new type of environmentally friendly packaging material. It is composed of countless independent air bubbles created through the physical foaming of low-density polyethylene resin. This overcomes the shortcomings of ordinary foam, such as fragility, deformation, and poor resilience. It possesses numerous advantages, including water and moisture resistance, shock absorption, sound insulation, heat insulation, excellent plasticity, high toughness, recyclability, environmental friendliness, and strong impact resistance. It also exhibits excellent chemical resistance, making it an ideal substitute for traditional packaging materials.

[0003] Traditional EPE (Expanded Polyethylene) packaging materials generally suffer from problems such as uniform structure and single performance: the single-density design makes it difficult to balance static pressure resistance and dynamic impact energy absorption, and it is prone to permanent deformation and insufficient resilience under high impact; the smooth surface makes it easy for the protected items to shift during transportation, causing secondary damage, and it is difficult to provide comprehensive and durable excellent shock absorption protection under complex working conditions (such as multiple drops, vibration, and impacts at different angles), especially failing to meet the stringent requirements for packaging safety of high-value and precision items. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shock-absorbing pearl cotton with better shock absorption and drop protection effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A shock-absorbing pearl cotton includes a bottom layer, on which a middle layer and a top layer are sequentially disposed.

[0007] The bottom, middle, and top layers exhibit a gradient density layered structure, with the surface layer having a higher density than the bottom layer, which in turn has a higher density than the middle layer.

[0008] The intermediate layer contains energy dissipation cavities. The distribution density of these cavities is higher in the geometric center of the pearl cotton than in the edge region. The energy dissipation cavities are spherical.

[0009] The surface end face is provided with several micro-protrusion structures, which are arrays of cones integrally formed on the outer surface of the surface, and the cones form flow guiding grooves.

[0010] The bottom layer has a honeycomb-shaped cavity, which is filled with elastic pillars. The upper and lower ends of the elastic pillars are connected to the inner wall of the honeycomb-shaped cavity, respectively.

[0011] The present invention is further configured such that: rubber particles are provided inside the honeycomb cavity, and the rubber particles fill the space between the honeycomb cavity and the elastic column.

[0012] The present invention is further configured such that: a thickness gradient zone is provided at the connection between the bottom and the surface of the micro-protrusion structure, the thickness increases from the top to the bottom of the micro-protrusion structure, and the inclination angle of the inclined surface of the micro-protrusion structure is an acute angle.

[0013] The present invention is further configured such that: the bottom layer, the middle layer and the top layer form a molten bonding interface through co-extrusion foaming, and the cavity wall of the energy dissipation cavity is directly bonded to the middle layer matrix.

[0014] The present invention is further configured such that the energy dissipation cavity comprises two geometric shapes: an ellipsoidal cavity and a polyhedron.

[0015] Compared with the shortcomings of the prior art, the beneficial effects of this utility model are as follows:

[0016] The gradient-density layered structure of the bottom, middle, and top layers effectively disperses impact force. The spherical energy dissipation cavities within the middle layer, densely distributed at their geometric center, significantly absorb vibration energy. The array of conical micro-protrusions on the surface end faces, combined with drainage channels, enhances anti-slip and drainage properties. Elastic columns within the honeycomb-like cavities of the bottom layer provide vertical support, while rubber granules filling the honeycomb cavities further buffer lateral impacts. The synergistic effect of these structures—gradient layers dispersing pressure, cavities dissipating energy and reducing vibration, conical structures providing anti-slip and moisture-proof properties, and honeycomb columns enhancing resilience—results in superior overall shock absorption and protection, extending service life. Attached Figure Description

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

[0018] Figure 2 This is a cross-sectional view of the middle layer of an embodiment of the present utility model;

[0019] Figure 3 This is a bottom cross-sectional view of an embodiment of the present utility model.

[0020] 1. Bottom layer; 2. Middle layer; 3. Surface layer; 4. Energy dissipation cavity; 5. Micro-protrusion structure; 6. Guide channel; 7. Honeycomb cavity; 8. Elastic column; 9. Rubber particles. Detailed Implementation

[0021] 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.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Working Principle: When in use, the shock-absorbing pearl cotton is placed between the protected item and the outer packaging box. When an impact occurs during transportation: First, the cone-shaped micro-protrusions 5 on the end face of the surface layer 3 contact the box wall, and their inclined surfaces disperse the pressure and prevent displacement. After the impact force is transmitted to the surface layer 3, it bears the pressure preferentially due to its highest density. When the pressure continues to penetrate to the middle layer 2, the spherical energy dissipation cavities 4 are compressed and deformed to absorb energy, and the dense distribution of energy dissipation cavities 4 in the central area enhances the energy absorption effect. When the residual impact force reaches the bottom layer 1, the elastic columns 8 in the honeycomb cavities 7 inside the bottom layer 1 undergo elastic compression, while the rubber particles 9 filling the honeycomb cavities provide lateral cushioning, forming double shock absorption. After the impact ends, the elastic columns 8 rebound and push the bottom layer 1 to recover, the cavities of the middle layer 2 return to their original state, and each layer recovers collaboratively through the fused interface. The entire process achieves shock absorption and protection through three steps: gradient density layer to disperse impact, cavity energy dissipation, and column cushioning.

[0024] like Figures 1 to 3 As shown,

[0025] The structure comprises a bottom layer 1, upon which a middle layer 2 and a top layer 3 are sequentially arranged. The layers of bottom layer 1, middle layer 2, and top layer 3 are co-extruded and foamed to form a fused interface. The cavity wall of the energy dissipation cavity 4 is directly bonded to the matrix of middle layer 2. This fused interface creates a seamless, integrated whole between bottom layer 1, middle layer 2, and top layer 3, avoiding the risk of interlayer delamination and ensuring efficient transmission of impact force between the gradient density layers. The direct bonding between the cavity wall and the matrix of middle layer 2 enhances structural integrity; under pressure, the cavity wall and matrix deform collaboratively, improving energy absorption efficiency and preventing shock absorption failure caused by cavity detachment or displacement. This dual-bonding process ensures the structural stability of the pearl cotton under repeated impacts.

[0026] The bottom layer 1, middle layer 2, and top layer 3 form a gradient density layered structure, with the density of top layer 3 being greater than that of bottom layer 1, which in turn is greater than that of middle layer 2. This gradient density layered structure allows the impact force to be dissipated layer by layer: the high-density top layer 3 disperses the initial impact, the low-density middle layer 2 efficiently absorbs energy, and the medium-density bottom layer 1 provides flexible cushioning. The three layers work together to avoid stress concentration and prevent rebound vibration.

[0027] The intermediate layer 2 has an energy dissipation cavity 4 inside. The energy dissipation cavity 4 has a higher distribution density in the geometric center area of ​​the pearl cotton than in the edge area. The energy dissipation cavity 4 is spherical, which can disperse impact stress, reduce local pressure, and prevent the intermediate layer 2 from collapsing.

[0028] The surface layer 3 has several micro-protrusion structures 5. The bottom of the micro-protrusion structure 5 is connected to the surface layer 3 with a thickness gradient area. The thickness increases from the top to the bottom of the micro-protrusion structure 5. The inclination angle of the inclined surface of the micro-protrusion structure 5 is between an acute angle and a right angle.

[0029] The micro-protrusion structure 5 is an array of cones integrally formed on the outer surface of the surface layer 3, with guide grooves 6 formed between the cones. The array of cones micro-protrusion structure 5 on the end face of the surface layer 3, together with the guide grooves 6, enhances the anti-slip and drainage properties.

[0030] The bottom layer 1 has a honeycomb cavity 7 inside, which is filled with elastic columns 8. The upper and lower ends of the elastic columns 8 are connected to the inner wall of the honeycomb cavity 7, respectively. Rubber particles 9 are also provided in the honeycomb cavity 7. The rubber particles 9 are filled between the honeycomb cavity 7 and the elastic columns 8. The honeycomb columns enhance the rebound, and the whole structure achieves better shock absorption and protection effect, and extends service life.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shock-absorbing pearl cotton, comprising a bottom layer (1), characterized in that: The bottom layer (1) is provided with an intermediate layer (2) and a top layer (3) in sequence. The bottom layer (1), the middle layer (2), and the top layer (3) exhibit a gradient density layered structure, with the density of the top layer (3) being greater than that of the bottom layer (1), which in turn is greater than that of the middle layer (2). The intermediate layer (2) has an energy dissipation cavity (4) inside. The energy dissipation cavity (4) has a higher distribution density in the geometric center region of the pearl cotton than in the edge region. The energy dissipation cavity (4) is spherical. The surface layer (3) has several micro-protrusion structures (5) on its end face. The micro-protrusion structures (5) are arrayed cones integrally formed on the outer surface of the surface layer (3), and the cones form a flow channel (6). The bottom layer (1) has a honeycomb cavity (7) inside, and the honeycomb cavity (7) is filled with an elastic column (8). The upper and lower ends of the elastic column (8) are connected to the inner wall of the honeycomb cavity (7) respectively.

2. The shock-absorbing pearl cotton according to claim 1, characterized in that: The honeycomb cavity (7) is also provided with rubber particles (9), which fill the space between the honeycomb cavity (7) and the elastic column (8).

3. The shock-absorbing pearl cotton according to claim 1, characterized in that: The bottom of the micro-protrusion structure (5) is connected to the surface layer (3) with a thickness gradient zone. The thickness increases from the top of the micro-protrusion structure (5) to the bottom. The slope angle of the micro-protrusion structure (5) is an acute angle.

4. The shock-absorbing pearl cotton according to claim 1, characterized in that: The bottom layer (1), the middle layer (2) and the top layer (3) are formed by co-extrusion foaming to form a molten bonding interface, and the cavity wall of the energy dissipation cavity (4) is directly bonded to the matrix of the middle layer (2).

5. The shock-absorbing pearl cotton according to claim 1, characterized in that: The energy dissipation cavity (4) comprises two geometric shapes: an ellipsoidal cavity and a polyhedron.

Images