Broadband noise reduction laminated glass

Abstract

The utility model provides a kind of broadband noise reduction laminated glass, belongs to noise reduction glass technical field, in industrial production, existing noise reduction glass has problems such as big weight, low light transmittance, not durable for middle frequency sound absorption layer, etc., the glass includes outer thick glass layer and inner thin glass layer, middle composite interlayer, from outside to inside in turn high frequency damping layer, high frequency shielding layer and middle frequency absorption layer;High frequency damping layer is ceramic particle reinforced EVA layer added with alumina ceramic particles, high frequency shielding layer is brass net metal net interlayer, and middle frequency absorption layer is closed-cell structure high-density polyethylene sound absorption layer;The thickness of each layer has clear specification, and interlayer is fixed using specific bonding mode.This glass has better high-frequency noise reduction effect and better light transmission, stable middle-frequency absorption and resistant to industrial environment, impact resistance performance meets standards, interlayer bonding is stable, broadband coverage is comprehensive, and can protect the hearing health of operating personnel.

Description

Technical Field

[0001] This utility model relates to the field of noise-reducing glass technology, and in particular to a broadband noise-reducing laminated glass. Background Technology

[0002] In industrial production environments, noise generated by motor operation, machine tool cutting, and fan operation is common. Among these noises, high-frequency components account for a large proportion, have concentrated energy, and travel long distances. Long-term exposure to this environment can affect the hearing health of workers.

[0003] Existing glass solutions for treating high-frequency noise in industrial settings often employ a sandwich structure of tempered glass and a metal plate. However, the high density of the metal plate significantly increases the overall weight of the glass, placing a burden on the wall's load-bearing capacity. Furthermore, the low light transmittance makes it difficult to meet the lighting requirements of industrial plants. For mid-frequency noise treatment, existing glass sound-absorbing layers often use ordinary porous polyurethane or glass wool. These materials have poor oil resistance, are easily clogged by oil stains, leading to a rapid decline in sound absorption performance. Additionally, their low structural strength makes them prone to breakage and detachment, hindering long-term stable use.

[0004] To address the aforementioned problems, this utility model proposes a broadband noise-reducing laminated glass. Utility Model Content

[0005] This invention provides a broadband noise-reducing laminated glass that solves the shortcomings of existing technologies, such as difficulty in handling high-frequency and mid-frequency noise in industrial environments, insufficient resistance to oil stains and temperature changes, and low light transmittance.

[0006] This utility model provides the following technical solution:

[0007] A broadband noise-reducing laminated glass, comprising:

[0008] An outer thick glass layer for impact resistance and an inner thin glass layer for structural support, both of which are made of tempered glass, with a composite interlayer between them.

[0009] The composite interlayer comprises, from the outside to the inside, a high-frequency damping layer, a high-frequency shielding layer, and a mid-frequency absorption layer. The high-frequency damping layer is a ceramic particle-reinforced EVA layer with added alumina ceramic particles. The high-frequency shielding layer is a metal mesh interlayer with a brass mesh count of 120. The mid-frequency absorption layer is a high-density polyethylene sound-absorbing layer with a closed-cell structure formed by micro-foaming process.

[0010] In one possible design, the outer thick glass layer has a thickness of 8 mm, and the inner thin glass layer has a thickness of 6 mm.

[0011] In one possible design, the outer thick glass layer and the high-frequency damping layer are fused and bonded together by vacuum hot pressing.

[0012] In one possible design, the high-frequency shielding layer is embedded in the molten high-frequency damping layer and bonded and fixed using the encapsulation force of the cooled EVA.

[0013] In one possible design, the high-frequency shielding layer and the mid-frequency absorption layer, as well as the mid-frequency absorption layer and the inner thin glass layer, are all bonded and fixed using a 0.15 mm thick polyolefin elastomer hot melt adhesive film as a transition bonding layer.

[0014] In one possible design, the high-frequency damping layer has a thickness of 3 mm, the high-frequency shielding layer has a thickness of 2 mm, and the mid-frequency absorption layer has a thickness of 5 mm.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0016] The working principle of this technical solution is as follows:

[0017] This broadband noise-reducing laminated glass utilizes a structure of "outer layer impact resistance, composite interlayer noise reduction, and inner layer support" to effectively address industrial noise along its propagation path (outside environment → glass → indoor environment). The specific mechanism of action is as follows:

[0018] In the pretreatment process of the outer thick glass layer (8mm tempered glass), when high-frequency noise (8000-20000Hz, such as motor vibration and machine tool cutting) and impact loads (such as falling parts) in the industrial environment act on the glass, the outer 8mm thick tempered glass first performs its function: relying on the high mechanical strength of tempered glass (bending strength ≥150MPa), it directly resists external impacts and avoids the impact load directly damaging the inner structure; utilizing the rigid surface characteristics of tempered glass, it reflects some high-frequency noise (especially 15000-20000Hz ultra-high frequency), reducing the noise energy entering the composite interlayer and reducing the burden on subsequent noise reduction stages.

[0019] In the layered noise reduction mechanism (core function) of the composite sandwich layer, the composite sandwich layer (high-frequency damping layer → high-frequency shielding layer → mid-frequency absorption layer) forms a progressive treatment of "damping attenuation - shielding and blocking - absorption and dissipation" along the noise propagation direction, accurately covering the core noise frequency band of industry: the energy attenuation effect of the high-frequency damping layer (3mm ceramic particle reinforced EVA layer) means that high-frequency noise (8000-20000Hz) that is not reflected by the outer layer enters this layer, and the high damping characteristics of the EVA matrix can convert the noise vibration energy into heat energy dissipation; at the same time, the uniformly distributed 15% alumina ceramic particles (particle size 5-10μm) further enhance the high-frequency vibration attenuation effect through interfacial friction with the EVA matrix, so that the high-frequency noise energy is reduced by a part first. In addition, this layer is bonded to the outer glass layer by vacuum hot pressing, without interlayer bubbles, ensuring that the noise vibration can be directly transmitted to the damping layer for treatment, avoiding vibration reflection or attenuation failure caused by bubbles;

[0020] The high-frequency shielding layer (2mm 120-mesh brass mesh) enhances the barrier effect. After the high-frequency noise is attenuated by the damping layer, it enters the brass mesh layer embedded with molten EVA. The 120-mesh high-density mesh forms an "electromagnetic shielding barrier" that can reflect most of the remaining high-frequency noise (especially the 10,000-20,000Hz ultra-high frequency) and prevent it from penetrating to the inner layer. At the same time, the brass mesh is fixed by physical anchoring and bonding after the EVA cools down, so there is no risk of mesh displacement, ensuring the integrity of the shielding area and avoiding "shielding gaps" due to mesh displacement.

[0021] The mid-frequency absorption layer (5mm closed-cell HDPE layer) is specifically designed to dissipate mid-frequency noise (3000-8000Hz, such as fan airflow noise) in industrial environments. Due to its low frequency and strong penetrability, it needs to be absorbed through a closed-cell structure. The closed cells formed by micro-foaming of HDPE can convert mid-frequency noise energy into internal energy dissipation through the vibration of the pore walls. This layer is bonded to the high-frequency shielding layer and the inner glass layer with a 0.15mm POE hot melt adhesive film. The compatibility of POE with HDPE and glass ensures that the interlayer bonding strength is ≥12N / cm, avoiding interlayer delamination caused by mid-frequency vibration and ensuring stable absorption effect.

[0022] In the support and protection of the inner thin glass layer (6mm tempered glass), the inner 6mm tempered glass provides structural support for the composite interlayer, preventing the glass from deforming due to impact from the outer layer or the weight of the interlayer itself; on the other hand, it can reflect a small amount of noise that is not treated by the mid-frequency absorption layer, further improving the noise reduction effect. At the same time, its tempered properties ensure that there are no sharp fragments after the glass breaks, which meets industrial safety requirements.

[0023] This utility model has the following beneficial effects:

[0024] This invention achieves good high-frequency noise reduction while maintaining light transmission. Through the synergistic effect of "ceramic particle-reinforced EVA damping + 120-mesh brass mesh shielding", the noise reduction of 10000-20000Hz high-frequency noise is ≥32dB, meeting the needs of industrial high-frequency noise control; using brass mesh and without metal plate obstruction, the light transmittance is ≥75%, which meets the requirement of ≥2% daylight factor for industrial plants in GB 50033-2013 "Standard for Daylighting Design of Buildings", thus balancing noise reduction and light transmission.

[0025] This invention provides stable mid-frequency absorption and resistance to industrial environments. The closed-cell HDPE sound-absorbing layer reduces mid-frequency noise by ≥38dB in the 3000-8000Hz range. Furthermore, HDPE is oil-resistant (industrial oil cannot clog the closed pores), and its sound absorption performance after 3 months of use is significantly better than existing ordinary porous polyurethane or glass wool (which is easily broken and detached). HDPE has a temperature resistance range of -40℃ to 90℃, covering the temperature fluctuations of industrial environments from -30℃ to 80℃, avoiding interlayer cracking caused by temperature changes in existing ordinary EVA (-10℃ to 60℃), thus ensuring long-term stability of the mid-frequency absorption effect.

[0026] This invention achieves satisfactory impact resistance, meeting industrial safety requirements. The structure of an 8mm outer layer and a 6mm inner layer of tempered glass, combined with the elastic cushioning of the composite interlayer, ensures impact resistance that meets the Class I laminated glass requirements of GB 15763.3-2009 (unbreakable upon impact from a 1040g steel ball at a height of 1.2m). This solves the problem of the fragility of existing single-layer 10mm tempered glass and can withstand the impact risks from falling parts and equipment handling in industrial environments.

[0027] This invention features stable interlayer adhesion with no risk of delamination. The connection methods for each layer are specifically optimized: vacuum hot-press bonding between the outer layer and the damping layer (peel strength ≥18N / cm), brass mesh embedded in EVA for fixation (no displacement), and bonding between the HDPE layer and the adjacent POE film (bonding strength ≥12N / cm), all meeting or exceeding national standards. Even under long-term exposure to industrial oil contamination and temperature fluctuations, there is no delamination or cracking between layers, ensuring continuous and stable noise reduction performance and avoiding noise reduction attenuation due to interlayer delamination.

[0028] This utility model offers comprehensive wide-band noise reduction, meeting industrial health standards. It achieves overall noise reduction across a wide frequency range of 3000-20000Hz, with high-frequency (8000-20000Hz) noise reduction ≥32dB and mid-frequency (3000-8000Hz) noise reduction ≥38dB. This can control indoor noise in industrial workshops to ≤85dB(A), complying with GBZ 2.2-2007 "Occupational Exposure Limits for Hazardous Factors in the Workplace," protecting the hearing health of operators, and simultaneously preventing high-frequency vibrations from interfering with the operational accuracy of precision equipment. Attached Figure Description

[0029] Figure 1 A three-dimensional structural diagram of a broadband noise-reducing laminated glass provided in an embodiment of this utility model;

[0030] Figure 2 A schematic diagram of the planar structure of a broadband noise-reducing laminated glass provided in an embodiment of this utility model;

[0031] Figure 3 A schematic diagram of the separation structure of the outer thick glass layer, the inner thin glass layer, and the composite interlayer of a broadband noise-reducing laminated glass provided in an embodiment of this utility model;

[0032] Figure 4 This is a schematic diagram of the composite sandwich structure of a broadband noise-reducing laminated glass provided in an embodiment of the present invention.

[0033] Reference numerals in the attached figures: 1. Outer thick glass layer; 2. Inner thin glass layer; 3. Composite interlayer; 4. High-frequency damping layer; 5. High-frequency shielding layer; 6. Mid-frequency absorption layer. Detailed Implementation

[0034] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0037] Example:

[0038] Please refer to Figures 1-4 A broadband noise-reducing laminated glass, used in the field of noise-reducing glass, includes an outer thick glass layer 1, an inner thin glass layer 2, and a composite interlayer 3 disposed between the outer thick glass layer 1 and the inner thin glass layer 2.

[0039] The outer thick glass layer 1 is made of tempered glass with a thickness of 8mm. It has high mechanical strength and bending strength ≥150MPa. It can directly resist external impacts such as falling parts in the industrial environment, and avoid the impact load directly damaging the inner structure. At the same time, by utilizing the rigid surface characteristics of tempered glass, it can reflect some high-frequency noise (especially 15000-20000Hz ultra-high frequency), reducing the noise energy entering the composite interlayer 3.

[0040] The inner thin glass layer 2 is made of 6mm thick tempered glass, which provides structural support for the composite interlayer 3, preventing the glass from deforming due to impact from the outer layer or the weight of the interlayer itself. It can also reflect a small amount of noise that is not treated by the mid-frequency absorption layer 6, further improving the noise reduction effect. In addition, its tempered properties ensure that there are no sharp fragments after the glass breaks, which meets industrial safety requirements.

[0041] The composite interlayer 3 consists of a high-frequency damping layer 4, a high-frequency shielding layer 5, and a mid-frequency absorption layer 6 from the outside to the inside. The high-frequency damping layer 4 is a ceramic particle-reinforced EVA layer with 15% alumina ceramic particles (particle size 5-10μm) added, with a thickness of 3mm. The EVA matrix has high damping characteristics, which can convert the vibration energy of high-frequency noise (8000-20000Hz) entering the layer into heat energy dissipation. The uniformly distributed alumina ceramic particles further enhance the high-frequency vibration attenuation effect through interfacial friction with the EVA matrix. The outer thick glass layer 1 and the high-frequency damping layer 4 are fused and bonded together by vacuum hot pressing, with a peel strength ≥18N / cm and no interlayer bubbles, ensuring that noise vibration can be directly transmitted to the damping layer for treatment, avoiding vibration reflection or attenuation failure caused by bubbles.

[0042] The high-frequency shielding layer 5 is a brass mesh interlayer with a mesh count of 120 and a thickness of 2mm. High-frequency noise attenuated by the damping layer enters this layer. The 120-mesh high-density mesh forms an "electromagnetic shielding barrier" that can reflect most of the remaining high-frequency noise (especially the 10,000-20,000Hz ultra-high frequency) and prevent it from penetrating into the inner layer. The high-frequency shielding layer 5 is embedded in the molten high-frequency damping layer 4 and is bonded and fixed by the wrapping force of the cooled EVA. There is no risk of mesh displacement, ensuring the integrity of the shielding area and avoiding "shielding gaps" due to mesh displacement.

[0043] The mid-frequency absorption layer 6 is a high-density polyethylene sound-absorbing layer with a closed-cell structure formed by micro-foaming process, with a thickness of 5mm. Mid-frequency noise (3000-8000Hz) in the industrial environment has a low frequency and strong penetration. After entering this layer, the closed-cell structure formed by micro-foaming of HDPE converts the mid-frequency noise energy into internal energy dissipation through the vibration of the pore walls. The high-frequency shielding layer 5, the mid-frequency absorption layer 6, and the mid-frequency absorption layer 6 and the inner thin glass layer 2 are all bonded and fixed with a 0.15mm thick polyolefin elastomer hot melt adhesive film as a transition bonding layer. The compatibility of POE with HDPE and glass ensures that the interlayer bonding strength is ≥12N / cm, avoiding interlayer delamination caused by mid-frequency vibration and ensuring stable absorption effect.

[0044] This broadband noise-reducing laminated glass achieves noise reduction across a wide frequency range of 3000-20000Hz, with high-frequency (8000-20000Hz) noise reduction ≥32dB and mid-frequency (3000-8000Hz) noise reduction ≥38dB. It can control indoor noise in industrial workshops to ≤85dB(A), meeting the requirements of GBZ 2.2-2007 "Occupational Exposure Limits for Hazardous Factors in the Workplace". Furthermore, it uses brass mesh and has no metal plates to obstruct the light, resulting in a light transmittance ≥75%, meeting the requirement of ≥2% daylighting coefficient for industrial plants in GB 50033-2013 "Standard for Daylighting Design of Buildings". The closed-cell HDPE sound-absorbing layer is oil-resistant, and industrial oil cannot clog the closed pores. After 3 months of use, its sound absorption performance attenuation is far superior to existing ordinary porous polyurethane or glass wool. The HDPE temperature range is -40℃ to 90℃, covering industrial environments. Temperature fluctuations of 30℃ to 80℃ prevent interlayer cracking caused by temperature changes, ensuring long-term stability of mid-frequency absorption. The structure of 8mm outer and 6mm inner tempered glass, combined with the elastic buffer of composite interlayer 3, ensures impact resistance that meets the requirements of Class I laminated glass in GB15763.3-2009 (unbreakable after impact with a 1040g steel ball from a height of 1.2m).

[0045] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0046] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A broadband noise-reducing laminated glass, characterized in that, include: The outer thick glass layer (1) for impact resistance and the inner thin glass layer (2) for structural support are both made of tempered glass, and a composite interlayer (3) is provided between the outer thick glass layer (1) and the inner thin glass layer (2). The composite interlayer (3) includes, from the outside to the inside, a high-frequency damping layer (4), a high-frequency shielding layer (5), and a mid-frequency absorption layer (6). The high-frequency damping layer (4) is a ceramic particle-reinforced EVA layer with added alumina ceramic particles. The high-frequency shielding layer (5) is a metal mesh interlayer with a brass mesh count of 120. The mid-frequency absorption layer (6) is a high-density polyethylene sound-absorbing layer with a closed-cell structure formed by micro-foaming process.

2. The broadband noise-reducing laminated glass according to claim 1, characterized in that, The outer thick glass layer (1) has a thickness of 8 mm, and the inner thin glass layer (2) has a thickness of 6 mm.

3. The broadband noise-reducing laminated glass according to claim 1, characterized in that, The outer thick glass layer (1) and the high-frequency damping layer (4) are fused and bonded together by vacuum hot pressing.

4. The broadband noise-reducing laminated glass according to claim 1, characterized in that, The high-frequency shielding layer (5) is embedded in the molten high-frequency damping layer (4) and bonded and fixed by the encapsulation force of the cooled EVA.

5. The broadband noise-reducing laminated glass according to claim 1, characterized in that, The high-frequency shielding layer (5), the mid-frequency absorption layer (6), the mid-frequency absorption layer (6) and the inner thin glass layer (2) are all bonded and fixed using a 0.15mm thick polyolefin elastomer hot melt adhesive film as a transition bonding layer.

6. The broadband noise-reducing laminated glass according to claim 1, characterized in that, The high-frequency damping layer (4) has a thickness of 3 mm, the high-frequency shielding layer (5) has a thickness of 2 mm, and the mid-frequency absorption layer (6) has a thickness of 5 mm.

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