A hemp fiber / corn cob composite fabric sound-absorbing material and its preparation method

Abstract

This invention relates to a hemp fiber / corn cob composite fabric sound-absorbing material and its preparation method. The composite fabric sound-absorbing material of this invention is made by bonding natural hemp fiber and agricultural waste corn cob powder through a process of web laying, powder spreading, and hot-melt bonding. The invention involves opening, combing, and web forming hemp fibers to obtain a thin layer of hemp fiber web. Corn cob powder and PE granules are then evenly spread on the hemp fiber web to obtain a thin layer of hemp fiber / corn cob composite fiber web. Multiple layers of composite fiber webs are then laminated and subjected to high-temperature treatment in an oven, where the PE granules melt, bonding the hemp fiber and corn cob powder together to obtain the hemp fiber / corn cob composite fabric sound-absorbing material. This sound-absorbing material is soft, has good low-frequency sound absorption, is natural and environmentally friendly, has a simple preparation method, good economic benefits, and is suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of fabric sound-absorbing materials and their preparation, and specifically relates to a hemp fiber / corn cob composite fabric sound-absorbing material and its preparation method. Background Technology

[0002] The wavelength of a sound wave is inversely proportional to its frequency. High-frequency sound waves have shorter wavelengths and can be attenuated more quickly in high-porosity nonwoven sound-absorbing materials. These fabrics exhibit good mid-to-high frequency sound absorption performance and are widely used in sound absorption and noise reduction. In contrast, low-frequency sound waves are longer and easily penetrate materials, resulting in weaker low-frequency sound absorption performance and limiting their application in sound absorption and noise reduction. Particulate sound-absorbing materials combine the sound absorption of particle vibration and the sound absorption through the pores between particles, exhibiting good low-frequency sound absorption performance. Furthermore, these materials are lightweight, non-corrosive, and simple to manufacture, making them widely used in sound absorption and noise reduction. Hemp fiber is the softest of the bast fibers and the strongest natural fiber. Its surface is rough due to the distribution of horizontal and vertical striations, and it contains an internal cavity, giving it good antibacterial, moisture-absorbing, and sound-absorbing properties. It is widely used in antibacterial, moisture-absorbing, and sound-absorbing noise reduction applications.

[0003] This invention combines the sound absorption principles of porous fabrics and particle vibration. Using natural hemp fiber and agricultural waste corn cobs as raw materials, the hemp fibers are combed into a web, then corn cob powder and PE particles are evenly spread to form a thin-layer hemp fiber / corn cob composite fiber web. Six layers of the composite fiber web are laminated and then thermally bonded together to obtain a soft, environmentally friendly hemp fiber / corn cob composite fabric sound-absorbing material with excellent low-frequency sound absorption. Therefore, this invention develops a hemp fiber / corn cob composite fabric sound-absorbing material. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a hemp fiber / corn cob composite fabric sound-absorbing material. The composite fabric sound-absorbing material prepared by this method has excellent low-frequency sound absorption performance, with an average sound absorption coefficient of 0.544 in the frequency range of 630-1800Hz and a maximum sound absorption coefficient of 0.872. The composite fabric sound-absorbing material prepared by this invention has a wide low-frequency sound absorption bandwidth, with sound absorption coefficients greater than 0.305 in the frequency range of 800-1800Hz. The sound-absorbing material prepared by this invention is soft, environmentally friendly, has good low-frequency sound absorption performance, is simple to prepare, has good economic benefits, and is suitable for industrial production.

[0005] This invention discloses a hemp fiber / corn cob composite fabric sound-absorbing material and its preparation method, characterized in that: the composite fabric sound-absorbing material is obtained by laminating and hot-melt bonding six thin layers of hemp fiber / corn cob powder composite fiber web; the composite fiber web is obtained by uniformly spreading corn cob powder and PE particles on a hemp fiber web; the hemp fiber web is obtained by opening, combing, and laying hemp fibers; wherein the PE particles are hot-melted at high temperature to bond the fiber web and corn cob powder together; the particle size of the PE particles is 0.8-1.5 mm, the particle size of the corn cob powder is 0.5-1.0 mm, the mixing mass ratio of corn cob powder, hemp fiber, and PE particles in the composite fiber web is 55:9:36, the thickness of the composite fabric sound-absorbing material is 1.5-2.0 cm, and the basis weight of the composite fabric sound-absorbing material is 3.0-4.0 kg / m³. 2 The hot-melting temperature of the composite fiber web is 120-140℃, and the hot-melting time is 15-30 minutes.

[0006] The present invention discloses a method for preparing a hemp fiber / corn cob composite fabric sound-absorbing material, comprising:

[0007] (1) Hemp fiber is obtained by opening, combing and forming hemp fiber web through the processes of opening, combing and forming hemp fiber web;

[0008] (2) Based on the quality of the hemp fiber net, weigh the corresponding mass of corn cob powder and PE particles according to the mixing mass ratio of corn cob powder, hemp fiber and PE particles of 55:9:36, mix them evenly, and then use a small hole sieve to evenly spread the mixed powder of corn cob powder and PE particles on the hemp fiber net to obtain a thin layer of hemp fiber / corn cob powder composite fiber net.

[0009] (3) The six-layer composite fiber mesh is laminated and then placed in an oven. After high-temperature treatment, the PE particles melt and the hemp fiber and corn cob powder are bonded together to obtain a hemp fiber / corn cob composite fabric sound-absorbing material.

[0010] This invention combines the sound absorption principles of porous fabrics and particle vibration. Using natural hemp fiber and agricultural waste corn cobs as raw materials, the hemp fibers are combed into a web, then corn cob powder and PE particles are evenly spread to form a thin-layer hemp fiber / corn cob composite fiber web. Six layers of the composite fiber web are laminated and then thermally bonded together to obtain a soft, environmentally friendly hemp fiber / corn cob composite fabric sound-absorbing material with excellent low-frequency sound absorption. Therefore, this invention develops a hemp fiber / corn cob composite fabric sound-absorbing material.

[0011] Beneficial effects

[0012] (1) The hemp fiber / corn cob composite fabric sound-absorbing material prepared by this invention has excellent low-frequency sound absorption performance, with an average sound absorption coefficient of 0.544 in the frequency range of 630-1800Hz, and a maximum sound absorption coefficient that can reach

[0013] 0.872; The composite fabric sound-absorbing material prepared by this invention has a wide low-frequency sound absorption bandwidth, in the range of 800~

[0014] The sound absorption coefficient is greater than 0.305 in the 1800Hz frequency range;

[0015] (2) The sound-absorbing material prepared by the present invention is soft, environmentally friendly, and has excellent low-frequency sound absorption performance. The preparation method is simple, economically efficient, and suitable for industrial production. Attached Figure Description

[0016] Figure 1 The sound absorption coefficient curve of hemp fiber / corn cob composite fabric sound-absorbing material and its comparison with the sound absorption coefficient of hemp fiber fabric and corn cob material. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0018] Example 1

[0019] Hemp fibers are opened, combed, and formed into a web to obtain a hemp fiber web. Based on the quality of the hemp fiber web, corn cob powder and PE granules are weighed out according to a mixing ratio of 55:9:36, and mixed evenly. The mixture is then evenly spread onto the hemp fiber web using a small-mesh sieve, resulting in a thin-layer hemp fiber / corn cob powder composite fiber web. Six layers of the composite fiber web are laminated and then placed in an oven for high-temperature treatment (130℃) for 20 minutes to melt the PE granules and bond the hemp fibers and corn cob powder together, resulting in a hemp fiber / corn cob composite fabric sound-absorbing material. The corn cob particle size is 0.8 mm, the PE particle size is 1.0 mm, and the basis weight of the composite fabric sound-absorbing material is 3.9 kg / m². 2 The thickness is 1.5cm.

[0020] Comparative Example 1

[0021] Hemp fibers are opened, combed, and formed into a web to obtain a hemp fiber web. Based on the quality of the hemp fiber web, PE granules are weighed according to a mixing ratio of hemp fiber to PE granules of 20:80. The PE granules are then evenly spread on the hemp fiber web using a small-mesh sieve to obtain a thin layer of hemp fiber web. Six layers of hemp fiber web are laminated together and then placed in an oven for high-temperature treatment (130℃) for 20 minutes to melt the PE granules and bond the hemp fibers together, resulting in a hemp fiber fabric. The PE granules have a particle size of 1.0 mm, and the hemp fiber fabric has a basis weight of 3.5 kg / m². 2 The thickness is 1.2cm.

[0022] Comparative Example 2

[0023] Corn cob powder and PE granules were uniformly mixed at a mass ratio of 60:40. The mixture was then placed into a cylindrical mold, pressure was applied to achieve a certain thickness, and the mold was placed in an oven and treated at high temperature (130℃) for 20 minutes. This melted the PE granules and bonded the corn cob powder together, resulting in corn cob material. The PE granules had a particle size of 1.0 mm, and the corn cob material had a basis weight of 4.1 kg / m³. 2 The thickness is 1.2cm.

[0024] Compared to hemp fiber fabrics and corn cob materials, hemp fiber / corn cob composite fabric sound-absorbing materials have better sound absorption performance in the low-frequency range of 100-1800Hz.

Claims

1. A sound-absorbing material made of hemp fiber / corn cob composite fabric, characterized in that: The composite fabric sound-absorbing material is obtained by laminating and hot-melt bonding six thin layers of hemp fiber / corn cob powder composite fiber web. The composite fiber web is obtained by evenly spreading corn cob powder and PE granules on a hemp fiber web. The hemp fiber web is obtained by opening, combing, and laying hemp fibers. The PE granules are hot-melted at high temperature to bond the fiber web and corn cob powder together. The particle size of the PE granules is 0.8–1.5 mm, and the particle size of the corn cob powder is 0.5–1.0 mm. The mass ratio of corn cob powder, hemp fiber, and PE granules in the composite fiber web is 55:9:

36. The thickness of the composite fabric sound-absorbing material is 1.5–2.0 cm, and the basis weight is 3.0–4.0 kg / m³. 2 The hot-melting temperature of the composite fiber web is 120-140℃, and the hot-melting time is 15-30 minutes.

2. The method for preparing a hemp fiber / corn cob composite fabric sound-absorbing material as described in claim 1, comprising: (1) Hemp fibers are opened, combed, and laid into a web to obtain a hemp fiber web; (2) Based on the quality of the hemp fiber net, weigh the corresponding mass of corn cob powder and PE particles according to the mixing mass ratio of corn cob powder, hemp fiber and PE particles of 55:9:36, mix them evenly, and then use a small hole sieve to evenly spread the mixed powder of corn cob powder and PE particles on the hemp fiber net to obtain a thin layer of hemp fiber / corn cob powder composite fiber net. (3) The six-layer composite fiber mesh is laminated and then placed in an oven. After high-temperature treatment, the PE particles melt and the hemp fiber and corn cob powder are bonded together to obtain a hemp fiber / corn cob composite fabric sound-absorbing material.

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