EA corrugated board with shock-absorbing buffering effect

Abstract

This utility model relates to corrugated cardboard, and more particularly to an EA corrugated cardboard with shock absorption and cushioning effect that combines lightweight, high compressive strength and excellent cushioning performance. The cardboard body includes a face layer, a bottom layer, a first corrugated layer, a second corrugated layer, and a third corrugated layer. The first corrugated layer is laminated on the bottom layer and has a wavy structure, resulting in first peaks and troughs staggered along the longitudinal direction. The second corrugated layer is laminated on the first corrugated layer and also has a wavy structure, resulting in second peaks and troughs staggered along the longitudinal direction. The lower end of the second trough abuts against the upper end of two adjacent first peaks, forming a first cushioning cavity between the second and first troughs. The first cushioning cavity is filled with first polyurethane elastomer particles. The third corrugated layer is laminated on the second corrugated layer, and the face layer is laminated on the third corrugated layer.

Description

Technical Field

[0001] This utility model relates to corrugated cardboard, and more particularly to an EA corrugated cardboard with shock absorption and cushioning effect. Background Technology

[0002] EA flute paperboard is a type of composite corrugated paperboard, composed of E-flute and A-flute. A-flute is characterized by a lower number of flutes per unit length and a higher flute height, typically 4.5-5 mm, with a flute width of 8-9.5 mm. This gives it good elasticity and excellent shock absorption, providing superior cushioning protection for packaged goods. For example, when transporting computers, the excellent cushioning performance of A-flute can effectively prevent damage from vibration and impact. E-flute, on the other hand, is known for its thinness and density, with a flute height typically 1.1-2 mm and a flute width of 3-3.5 mm. This results in a smooth surface and greater rigidity. When high-quality printing and display are required, the smooth surface of E-flute makes the printed images clearer and more refined. Combining the two, the outer E-flute provides a smooth surface and good rigidity, reducing external impacts and surface warping; the inner A-flute leverages its elasticity and cushioning advantages, acting as a buffer under impact loads. It is widely used in the packaging of electronic products such as computers, mobile phones, and cameras. EA corrugated cardboard can provide reliable protection to prevent damage to the products from vibration, collision and squeezing during transportation. At the same time, exquisite printing can showcase product characteristics and brand image.

[0003] However, existing corrugated cardboard still has insufficient cushioning performance when used in certain products, especially when transporting heavy or fragile items, such as ceramics and high-precision instruments. It is difficult to effectively disperse external impact forces, resulting in damage to the contents. In addition, traditional multi-layer corrugated cardboard is prone to collapse under pressure due to its simple structure and repetitive flute pattern, which cannot meet the high protection requirements. Summary of the Invention

[0004] Therefore, in view of the above problems, this utility model provides an EA corrugated cardboard with shock absorption and cushioning effect that combines lightweight, high compressive strength and excellent cushioning performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: EA corrugated cardboard with shock absorption and cushioning effect includes a corrugated cardboard body, defined as extending longitudinally along the length direction of the corrugated cardboard body and transversely along the width direction of the corrugated cardboard body. The corrugated cardboard body includes a face layer, a bottom layer, a first corrugated layer, a second corrugated layer, and a third corrugated layer. The first corrugated layer is laminated on the bottom layer and has a wavy structure, such that the first corrugated layer has first crests and first troughs staggered along the longitudinal direction. The longitudinal width of the first crest is equal to the longitudinal width of the first trough. The second corrugated layer is laminated on the first corrugated layer. The second corrugated layer has a wave structure, which makes the second corrugated layer have second peaks and second troughs that are staggered along the longitudinal direction. The longitudinal width of the second peak is equal to the longitudinal width of the second trough. The ratio of the longitudinal width of the second peak to the longitudinal width of the first peak is 1:2. The lower end of the second trough abuts against the upper end of two adjacent first peaks. A first buffer cavity is formed between the second trough and the first trough. The first buffer cavity is filled with first polyurethane elastomer particles. The third corrugated layer is composited on the second corrugated layer. The surface layer is composited on the third corrugated layer.

[0006] Furthermore, the third corrugated layer has a wave structure, which gives the third corrugated layer a third wave peak and a third wave trough that are staggered along the longitudinal direction. The longitudinal width of the third wave peak is equal to the longitudinal width of the third wave trough. The ratio of the longitudinal width of the second wave peak to the longitudinal width of the third wave peak is 1:3. The upper end of the second wave peak abuts against the lower end of two adjacent third wave troughs.

[0007] Furthermore, a second buffer cavity is formed between the two third troughs that are in contact with the second wave crest and the surface layer, and the second buffer cavity is filled with second polyurethane elastomer particles.

[0008] Furthermore, the ratio of the height dimension of the first corrugated layer to the height dimension of the second corrugated layer is 2:3.

[0009] Furthermore, the ratio of the height dimension of the third corrugated layer to the height dimension of the second corrugated layer is 1:2.

[0010] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This EA corrugated cardboard with shock absorption and cushioning effect, through the longitudinal staggered composite design of the first corrugated layer, the second corrugated layer and the third corrugated layer, specifically, the second corrugated layer and the first corrugated layer adopt a 1:2 crest width ratio to form an interlaced support network. Combined with the first polyurethane elastomer particles filled in the first cushioning cavity, the stress distribution is optimized to avoid local collapse. Moreover, the cushioning cavity filled with polyurethane particles can absorb impact energy, significantly reduce vibration transmission, and improve vertical compressive strength. At the same time, through the symmetrical design of crest / trough size, the material usage and structural rigidity are taken into account, and the overall weight is reduced, so that the corrugated cardboard body has both lightweight, high compressive strength and excellent cushioning performance. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of the corrugated cardboard body in an embodiment of this utility model. Detailed Implementation

[0012] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0013] The embodiment of this utility model is as follows: refer to Figure 1 As shown, the EA corrugated cardboard with shock absorption and cushioning effect includes a corrugated cardboard body, defined as extending along the length direction of the corrugated cardboard body as the longitudinal direction and extending along the width direction of the corrugated cardboard body as the transverse direction. The corrugated cardboard body includes a face layer 1, a bottom layer 2, a first corrugated layer 3, a second corrugated layer 4, and a third corrugated layer 5. The first corrugated layer 3 is laminated on the bottom layer 2. The first corrugated layer 3 has a wavy structure, such that the first corrugated layer 3 has first crests 31 and first troughs 32 staggered along the longitudinal direction. The longitudinal width dimension of the first crest 31 is equal to the longitudinal width dimension of the first trough 32. The second corrugated layer 4 is laminated on the first corrugated layer 3. The second corrugated layer 4 has a wave structure, which makes the second corrugated layer 4 have second peaks 41 and second troughs 42 staggered along the longitudinal direction. The longitudinal width of the second peak 41 is equal to the longitudinal width of the second trough 42. The ratio of the longitudinal width of the second peak 41 to the longitudinal width of the first peak 31 is 1:2. The lower end of the second trough 42 abuts against the upper end of two adjacent first peaks 31. A first buffer cavity 6 is formed between the second trough 42 and the first trough 32. The first buffer cavity 6 is filled with first polyurethane elastomer particles 7. The third corrugated layer 5 is laminated on the second corrugated layer 4, and the surface layer 1 is laminated on the third corrugated layer 5.

[0014] This EA corrugated cardboard with shock absorption and cushioning effect utilizes a longitudinally staggered composite design of the first corrugated layer 3, the second corrugated layer 4, and the third corrugated layer 5. Specifically, the second corrugated layer 4 and the first corrugated layer 3 adopt a 1:2 crest width ratio to form an interlaced support network. Combined with the first polyurethane elastomer particles 7 filled in the first cushioning cavity 6, the stress distribution is optimized to avoid local collapse. Furthermore, the cushioning cavity filled with polyurethane particles can absorb impact energy, significantly reduce vibration transmission, and improve vertical compressive strength. At the same time, the symmetrical design of crest / trough dimensions balances material usage and structural rigidity, reducing the overall weight. This allows the corrugated cardboard body 1 to combine lightweight, high compressive strength, and excellent cushioning performance.

[0015] Furthermore, the third corrugated layer 5 has a wave structure, which gives it staggered third peaks 51 and third troughs 52 along the longitudinal direction. The longitudinal width of the third peak 51 is equal to the longitudinal width of the third trough 52. The ratio of the longitudinal width of the second peak 41 to the longitudinal width of the third peak 51 is 1:3. The upper end of the second peak 41 abuts against the lower end of two adjacent third troughs 52. The third corrugated layer 5 and the second corrugated layer 4 adopt a 1:3 peak width ratio, and the abutment relationship between the peaks and troughs is limited, so that the contact point between the third trough 52 and the second peak 41 forms multi-point support, dispersing external pressure to a larger area, improving compressive strength. The combination of peaks and troughs with different size ratios enhances the overall elastic recovery ability, and the structural stability is improved by more than 30% after repeated pressure.

[0016] Furthermore, a second buffer cavity 8 is formed between the two third troughs 52 that contact the second wave crest 41 and the surface layer 1. The second buffer cavity 8 is filled with second polyurethane elastomer particles 9. The addition of the second buffer cavity 8 filled with second polyurethane elastomer particles 9 between the second wave crest 41 and the surface layer 1 allows the two layers of elastic particles to cope with impacts from different directions. Specifically, the first buffer cavity 6 absorbs vertical impacts, and the second buffer cavity 8 suppresses lateral vibrations, thereby improving buffering efficiency. The elastic deformation space of the filled particles can alleviate material fatigue under long-term loads and extend service life.

[0017] In this embodiment, the ratio of the height of the first corrugated layer 3 to the height of the second corrugated layer 4 is 2:3. The taller second corrugated layer 4 provides basic support, while the shorter first corrugated layer 3 enhances the deformation energy absorption capacity, thereby increasing the overall bending strength. Furthermore, the height difference avoids the superposition of interlayer stress, allowing each layer to deform independently under pressure, thus reducing the risk of collapse.

[0018] In this embodiment, the height ratio of the third corrugated layer 5 to the second corrugated layer 4 is 1:2. The shorter first corrugated layer 3 reduces the surface deformation range, ensures that the contents and the cardboard contact surface are evenly stressed, reduces the breakage rate, reduces the amount of material used by reducing the height of the top layer, and maintains the overall cushioning performance, thus reducing the weight per unit area.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. EA fluting board with shock-absorbing cushioning effect, characterized in that: The system includes a corrugated cardboard body, defined as extending longitudinally along its length and laterally along its width. The corrugated cardboard body comprises a face layer, a bottom layer, a first corrugated layer, a second corrugated layer, and a third corrugated layer. The first corrugated layer is laminated onto the bottom layer and has a wavy structure, resulting in alternating first crests and troughs along the longitudinal direction. The longitudinal width of the first crest is equal to the longitudinal width of the first trough. The second corrugated layer is laminated onto the first corrugated layer. The second corrugated layer has a wave-like structure, with second peaks and second troughs staggered along the longitudinal direction. The longitudinal width of the second peak is equal to the longitudinal width of the second trough. The ratio of the longitudinal width of the second peak to the longitudinal width of the first peak is 1:

2. The lower end of the second trough abuts against the upper end of two adjacent first peaks. A first buffer cavity is formed between the second trough and the first trough. The first buffer cavity is filled with first polyurethane elastomer particles. The third corrugated layer is laminated on the second corrugated layer, and the surface layer is laminated on the third corrugated layer.

2. The EA fluted paperboard having a shock-absorbing cushioning effect according to claim 1, characterized in that: The third corrugated layer has a wave structure, which makes the third corrugated layer have third peaks and third troughs that are staggered along the longitudinal direction. The longitudinal width of the third peak is equal to the longitudinal width of the third trough. The ratio of the longitudinal width of the second peak to the longitudinal width of the third peak is 1:

3. The upper end of the second peak abuts against the lower end of two adjacent third troughs.

3. The EA fluted paperboard having a shock absorbing cushioning effect according to claim 2, characterized in that: A second buffer cavity is formed between the two third troughs that are in contact with the second wave crest and the surface layer, and the second buffer cavity is filled with second polyurethane elastomer particles.

4. The EA corrugated paperboard having a shock-absorbing buffering effect according to any one of claims 1 to 3, characterized by: The ratio of the height dimension of the first corrugated layer to the height dimension of the second corrugated layer is 2:

3.

5. The EA corrugated paperboard having a shock-absorbing buffering effect according to any one of claims 1 to 3, characterized by: The ratio of the height dimension of the third corrugated layer to the height dimension of the second corrugated layer is 1:2.

Images