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Stepped density melt-blown nonwoven fabric, manufacturing method thereof and sound absorption materials made of same

A melt-blown non-woven fabric and density technology, applied in the field of non-woven materials, can solve the problems of unsatisfactory sound absorption effect, difficult audio sound absorption effect, etc., and achieve the effects of good sound absorption and sound insulation effect, simple preparation method, and easy availability of raw materials

Inactive Publication Date: 2015-07-01
SHANGHAI JIEYINGTU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above analysis, if the density of the material remains the same, it is difficult to make it exert the sound-absorbing effect of each audio frequency
Existing devices are generally single-suction, and the density of the obtained fiber accumulation layer is basically uniform in the thickness direction, and the sound absorption effect of uniform density materials for sounds of different frequencies is often not ideal.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Stepped density melt-blown nonwoven fabric, manufacturing method thereof and sound absorption materials made of same
  • Stepped density melt-blown nonwoven fabric, manufacturing method thereof and sound absorption materials made of same
  • Stepped density melt-blown nonwoven fabric, manufacturing method thereof and sound absorption materials made of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of embodiment 1PP fiber gradient density melt-blown nonwoven fabric

[0035] A kind of step density melt-blown nonwoven fabric, its density decreases stepwise along the thickness direction, and its density along the length and width directions is the same.

[0036] The stepwise decrease in density is 3kg / m every 1.5mm 3 , the maximum density is 40kg / m 3 , the minimum density is 16kg / m 3 .

[0037] The raw material is prepared as PP fiber slices, and the fineness of PP fiber is about 2 μm.

[0038] combine figure 2 , the preparation method comprises the following steps:

[0039] (1) Feed polymer fiber slices into the hopper, flow into the screw extruder, be heated and melted, filtered and metered, and extruded from the die spinneret hole 1 to form a thin stream 3 of polymer melt;

[0040](2) The heated air 2 is blown out at a high speed from the air ducts on both sides of the die spinneret hole 1, and stretches the thin stream 3 of the polymer melt...

Embodiment 2

[0044] The preparation of embodiment 2PET fiber gradient density melt-blown nonwoven fabric

[0045] A kind of step density melt-blown nonwoven fabric, its density decreases stepwise along the thickness direction, and its density along the length and width directions is the same.

[0046] The stepwise decrease in density is 3.5kg / m every 1.5mm 3 , the maximum density is 45kg / m 3 , the minimum density is 17kg / m 3 .

[0047] The raw material is prepared as dried PET fiber slices, and the fineness of the PET fiber is about 3 μm.

[0048] Preparation method: with embodiment 1.

[0049] The formed PET fiber gradient density melt-blown nonwoven fabric has the same density in the length and width directions, and the density distribution in the thickness direction from bottom to top is as follows:

[0050] Thickness (mm)

Embodiment 3

[0051] Embodiment 3 Preparation of sound-absorbing material

[0052] The upper and lower layers of the PP fiber gradient density melt-blown nonwoven fabric made in Example 1 are respectively composited with the first spunbond fabric (PP spunbond fabric) and the second spunbond fabric (PP spunbond fabric), and the three-layer cloth passes through The mesh curtain is sent to the middle of two spaced heat rollers for pre-pressing once to effectively bond the spunbond fabric and the melt-blown layer together to make a sound-absorbing material. Wherein, the grammage of the first spunbonded cloth is 15g / m 2 , the grammage of the second spunbond cloth is 15g / m 2 .

[0053] The weight of the sound-absorbing material is 400g / m 2 .

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Abstract

The invention discloses a stepped density melt-blown nonwoven fabric and a manufacturing method thereof. According to the stepped density melt-blown nonwoven fabric, the density is decreased gradually in a stepped mode in the thickness direction, and the density in the length direction and the density in the width direction are the same. The upper layer and the lower layer of the stepped density melt-blown nonwoven fabric are each provided with a spun-bonded fabric in a composite mode to form sound absorption materials. The obtained sound absorption materials have the good sound absorption effect at both low frequency and high frequency.

Description

technical field [0001] The invention relates to non-woven material technology, in particular to non-woven fabric with gradient density spun by melt-blown method, its manufacturing method, and sound-absorbing material made from it. Background technique [0002] With the development of transportation tools such as automobiles and high-speed railways, environmental noise pollution is becoming more and more serious, and people are paying more and more attention to various noise reduction technologies. Sound-absorbing technology is an important part of noise control, and sound-absorbing materials are mainly divided into porous sound-absorbing materials and resonant sound-absorbing materials. Due to the excellent performance of porous sound-absorbing materials in high frequency and broadband, more and more scholars have paid attention to them. One of the main characteristics of fiber material aggregates is porosity. Its pore structure is complex and the pores are connected in ser...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/70D04H1/4291D04H1/435G10K11/162
Inventor 刘伦贤郭超锋傅双亭
Owner SHANGHAI JIEYINGTU NEW MATERIAL TECH
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