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Full-frequency sound absorbing cotton

A technology of sound-absorbing cotton and polytetrafluoroethylene layer is applied in the field of sound-absorbing cotton, which can solve the problems of narrow sound-absorbing frequency bandwidth, etc., and achieve the effects of improving reliability, prolonging service life, and reducing electrical short-circuit accidents.

Active Publication Date: 2013-06-26
PAN ASIAN MICROVENT TECH JIANGSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitation of ordinary polyester fiber sound-absorbing cotton is that the sound-absorbing frequency width is narrow, and it can only have a good absorption effect on the sound of a specific frequency. According to its density, it only has a good performance for the corresponding frequency band.

Method used

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  • Full-frequency sound absorbing cotton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A. Select domestic polypropylene slices with a melt index of 12g / min and a molecular weight of 200,000. The screw speed of the melt blown equipment is 8 rpm, the receiving distance is 120mm, the melt temperature is 318°C, and the nozzle temperature is 325°C. The air temperature is 305°C to form ultra-fine fibers with an average diameter of <8 μm, the line speed of the receiving device is 2m / min, the thickness of the fiber layer is controlled to be <6mm, and the melt-blown polypropylene fiber thin layer 1 is cooled and solidified on the receiving device;

[0047] B. Prepare expanded polytetrafluoroethylene layer 2, mix polytetrafluoroethylene dispersion resin and aviation kerosene in a volume ratio of 1:2, pre-press into a cylinder blank, and make the cylinder blank into thin slices by calendering, and then evaporate The extruded polytetrafluoroethylene layer 2 is obtained by removing the extrusion aid, stretching and heat setting;

[0048] C. Combine one layer of melt-b...

Embodiment 2

[0050] A. Select domestic polypropylene slices with a melt index of 12g / min and a molecular weight of 200,000. The screw speed of the melt blown equipment is 8 rpm, the receiving distance is 120mm, the melt temperature is 318°C, and the nozzle temperature is 325°C. The air temperature is 305°C to form ultra-fine fibers with an average diameter of <8 μm, the line speed of the receiving device is 2m / min, the thickness of the fiber layer is controlled to be <6mm, and the melt-blown polypropylene fiber thin layer 1 is cooled and solidified on the receiving device;

[0051] B. Prepare expanded polytetrafluoroethylene layer 2, mix polytetrafluoroethylene dispersion resin and aviation kerosene in a volume ratio of 1:2, pre-press into a cylinder blank, and make the cylinder blank into thin slices by calendering, and then evaporate The expanded polytetrafluoroethylene layer 2 is obtained by removing aviation kerosene, stretching and heat setting;

[0052] C. One layer of melt-blown pol...

Embodiment 3

[0054] A. Prepare the expanded polytetrafluoroethylene layer 2, mix the polytetrafluoroethylene dispersion resin and aviation kerosene in a volume ratio of 1:2, pre-press into a cylinder blank, and make the cylinder blank into thin slices by calendering, and then evaporate After removing aviation kerosene, stretching and heat setting, the expanded polytetrafluoroethylene layer is obtained;

[0055] B. Melt-blown high polymer on expanded polytetrafluoroethylene layer 2 to make full-frequency sound-absorbing cotton, select domestic polyethylene terephthalate slices with a molecular weight of 300,000, and the screw speed of the melt-blown equipment is 8 Turns per minute, the receiving distance is 120mm, the polymer melt temperature is 318°C, the nozzle temperature of the melt blown equipment is 325°C, and the air temperature is 305°C, so that the melted polymer is drawn into ultra-fine particles with an average diameter of less than 8 μm Fiber, the line speed of the receiving dev...

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Abstract

The invention relates to full-frequency sound absorbing cotton which is provided with a double-layer structure or three-layer structure. The full-frequency sound absorbing cotton of the double-layer structure is composed of a melt-blow high polymer fiber layer and a varicosity polytetrafluoroethylene layer. The full-frequency sound absorbing cotton of the three-layer structure is composed of a melt-blow high polymer fiber layer with double faces compounded with the varicosity polytetrafluoroethylene layer or the varicosity polytetrafluoroethylene layer with double faces compounded with the melt-blow high polymer fiber layer. A high-performance composite micropore thin layer new material has better full-frequency sound absorbing capacity; is environment-friendly, non-toxic and free of peculiar smell, volatile gas, pollution or carcinogenic substances; and is free of stimulation caused by operating similar glass fiber on the skin, can be machined in punching mode, and does not generate dust or scraps and the like. The sound absorbing cotton made of the two materials of the melt-blow high polymer fiber layer and the varicosity polytetrafluoroethylene layer has good thermal resistance, and a sound absorbing effect cannot be affected by high-humidity climate and water.

Description

technical field [0001] The invention relates to a sound-absorbing cotton, in particular to a high-efficiency full-frequency sound-absorbing cotton composed of a melt-blown polymer fiber layer and an expanded polytetrafluoroethylene layer. Background technique [0002] The human ear is very sensitive to hearing. A normal person can detect a sound change of 1dB, and a difference of 3dB will feel a significant difference. Generally speaking, if it is below 15 decibels, we can consider it to be "dead silence". 20-40 decibels is about whispers in the ears of lovers. 40-60 decibels belong to our normal conversation sound. More than 60 decibels belong to the noisy range, 70 decibels we can think it is very noisy, and it starts to damage the hearing nerves, and more than 90 decibels will cause hearing loss, and stay in the space of 100-120 decibels, if there is no Unexpectedly, a human will be temporarily deaf in a minute. The human ear has a masking effect. When one sound is 10...

Claims

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Application Information

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IPC IPC(8): G10K11/168B32B5/22
Inventor 张云
Owner PAN ASIAN MICROVENT TECH JIANGSU CORP
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