CN110248305B - Tuning cotton and manufacturing process thereof - Google Patents
Tuning cotton and manufacturing process thereof Download PDFInfo
- Publication number
- CN110248305B CN110248305B CN201910507670.5A CN201910507670A CN110248305B CN 110248305 B CN110248305 B CN 110248305B CN 201910507670 A CN201910507670 A CN 201910507670A CN 110248305 B CN110248305 B CN 110248305B
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- tuning
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- cotton
- tuning cotton
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000007731 hot pressing Methods 0.000 claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 10
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 17
- 238000010521 absorption reaction Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 229920000877 Melamine resin Polymers 0.000 description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 5
- 230000001788 irregular Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses tuning cotton and a manufacturing process thereof, belonging to the technical field of tuning cotton. The tuning cotton is divided into three types: the tuning cotton is characterized by comprising ultramicropore tuning cotton for low-frequency band tuning, micropore tuning cotton for medium-frequency band tuning and membrane structure tuning cotton for high-frequency band tuning, wherein the pore diameter of the ultramicropore tuning cotton is 0.03-0.05 mm, the pore diameter of the micropore tuning cotton is 0.1-0.5 mm, the pore diameter of the membrane structure tuning cotton is 0.8-1.5 mm, the diaphragm rate is 50-80%, the tuning cotton is mainly manufactured by adopting a hot pressing process, and no additive is needed.
Description
Technical Field
The invention relates to the technical field of tuning cotton, in particular to tuning cotton and a manufacturing process thereof.
Background
After 2008, along with the electronic products are miniaturized more and more, the products are lighter and thinner, the design requirements on the sound production unit in the electronic products are higher and higher, and the traditional tuning materials cannot meet the requirements. Based on the situation, the inventor has seen the special requirements of the tuning cotton material, has conducted intensive research, and has conducted multiple experiments on the materials across industries to finally develop the tuning cotton material.
The tuning principle of the tuning cotton material is as follows: the sound generating body generates vibration and generates sound through air friction, the sound frequency in a specific space is different, in order to adjust the audio frequency generated in the specific space, the sound frequency in the specific space is improved by using a tuning cotton material, and the sound is more mellow through a virtual enlarged space. The tuning cotton material is a material formed by irregular pore structures with different diameters, the sound frequency and sound pressure generated by the sounding body compress different frequencies and sound pressure into the tuning cotton material, and due to instantaneous repeated compression and release in a specific space, the sound pressure and audio frequency are absorbed and released instantaneously in the irregular porous structure, and the audio frequency is adjusted to be a virtual space increased under the action of the proper pore diameter of the tuning cotton. The small loudspeaker can generate the effect of a large sound box.
In the low frequency range, the sound absorption coefficient with high density is higher, the frequency is higher than 500Hz, and the influence of the density on the sound absorption coefficient is small, because for the same material, the flow resistance of the material can be increased by increasing the density of the material, so that the low frequency sound absorption coefficient is increased, and the sound absorption coefficients of the medium frequency and the high frequency are not changed greatly or even reduced. The thickness has a greater effect on the sound absorption coefficient. The thickness is increased, the resonance frequency is shifted from high frequency to low frequency, the low-frequency sound absorption coefficient is improved, and when the noise contribution is larger by 500-1250 Hz, the sound absorption coefficient is higher, and the high-frequency sound absorption coefficient is not changed greatly. The sound absorption frequency bandwidth is obviously widened along with the increase of the thickness of the sample, and in practical application, the thickness of the material is reasonably selected according to the frequency spectrum characteristic of noise. Therefore, through application in different acoustic products for many years, in a specific space, the filling rate of the sound absorption material is between 60% and 80% of the space range, and the height is preferably between 80% and 90% of the specific height, while the tuning cotton in the prior art is single in type, and an additive needs to be added in the manufacturing process, so that the manufacturing process is complex.
Disclosure of Invention
The invention provides tuning cotton and a manufacturing process thereof.
The tuning cotton and the manufacturing process thereof are characterized in that the tuning cotton is divided into three types: the tuning cotton comprises ultramicropore tuning cotton for low-frequency-band tuning, micropore tuning cotton for medium-frequency-band tuning and membrane structure tuning cotton for high-frequency-band tuning, wherein the pore diameter of the ultramicropore tuning cotton is 0.03-0.05 mm, the pore diameter of the micropore tuning cotton is 0.1-0.5 mm, the pore diameter of the membrane structure tuning cotton is 0.8-1.5 mm, and the membrane rate is 50-80%; the manufacturing process comprises the following steps:
the method comprises the following steps of (1) physically cutting raw materials according to the compression ratio of the raw materials to form a sheet to be hot-pressed, wherein the thickness of the sheet to be hot-pressed is 2-30 mm;
step (2), setting the pressure, hot-pressing time, temperature and tool parameters of a hot press according to the thickness of the sheet to be hot-pressed, and carrying out hot pressing;
step (3), naturally cooling the sheet subjected to hot pressing in the step (2) to room temperature to solidify the sheet;
step (4), performing thickness detection on the sheet solidified in the step (3) by using a thickness gauge with the measuring head diameter of 30mm and the precision of 0.01 mm;
and (5) packaging the sheet with the thickness detected in the step (4).
Further, the raw material in the step (1) is polyurethane sponge or melamine sponge; the raw material for manufacturing the ultramicropore tuning cotton is melamine sponge, and the raw material for manufacturing the micropore tuning cotton and the membrane structure tuning cotton is polyurethane sponge.
Further, the compression ratio in the step (1) is 1: 1-15: 1.
Further, the pressure range in the step (2) is 10-300 kg, the hot pressing time range is 5-90 s, the temperature is 180-300 ℃, and the tooling is 0.1-6 mm, wherein the pressure, the hot pressing time, the temperature and the tooling are increased along with the increase of the thickness of the sheet to be hot pressed.
Further, the tooling means the thickness of the sheet material required to be achieved after hot pressing.
Furthermore, in the curing process in the step (3), the curing time of the sheet using the polyurethane sponge as the raw material is 6 hours, the curing time of the sheet using the melamine sponge as the raw material is 72 hours, and the sheet using the melamine sponge as the raw material generates springback in the curing process.
Compared with the prior art, the invention has the following positive effects:
1. the process is simple, easy to realize and convenient to control.
2. By adopting the hot pressing process, no additive is needed to be added in the manufacturing process.
3. Different types of tuning cotton can be selected according to the noise frequency range, the classification of the tuning cotton is refined, and the noise reduction effect of the tuning cotton is improved.
Drawings
FIG. 1 is a diagram of the low frequency spectrum (FR);
FIG. 2 is a graph of resonant frequency (IMP);
fig. 3 is a harmonic amplitude (THD) graph.
The reference numbers in figures 1, 2, 3 are respectively: A. the tuning cotton curve was not used; B. using tuning cotton curve
Detailed Description
The invention provides tuning cotton and a manufacturing process thereof, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
step (1), physically cutting the raw materials according to the compression ratio (5: 1) of the polyurethane sponge to form a sheet to be hot-pressed, wherein the thickness of the sheet to be hot-pressed is 10 mm;
step (2), setting parameters of 30-40 kg of pressure, 15-30 s of hot pressing time, 200-215 ℃ of temperature and 2mm of tooling of a hot press according to the thickness of a sheet to be hot pressed, and carrying out hot pressing;
step (3), naturally cooling the sheet subjected to hot pressing in the step (2) to room temperature, and solidifying for 6 hours to obtain microporous tuning cotton with the thickness of 2mm and the pore diameter of 0.1-0.5 mm;
step (4), performing thickness detection on the sheet solidified in the step (3) by using a thickness gauge with the measuring head diameter of 30mm and the precision of 0.01 mm;
and (5) packaging the sheet with the thickness detected in the step (4).
The second embodiment is as follows:
step (1), physically cutting the raw materials according to the compression ratio (5: 1) of the melamine material to form a sheet to be hot-pressed, wherein the thickness of the sheet to be hot-pressed is 10 mm;
step (2), setting parameters of 30 kg-60 kg of pressure, 40 s-60 s of hot pressing time, 260-280 ℃ of temperature and 1.8mm of tooling of a hot press according to the thickness of a sheet to be hot pressed, and carrying out hot pressing;
naturally cooling the sheet subjected to hot pressing in the step (2) to room temperature, and performing rebound solidification for 72 hours to obtain the ultramicropore tuning cotton with the thickness of 2mm and the pore diameter of 0.03-0.05 mm;
step (4), performing thickness detection on the sheet solidified in the step (3) by using a thickness gauge with the measuring head diameter of 30mm and the precision of 0.01 mm;
and (5) packaging the sheet with the thickness detected in the step (4).
The tuning principle of the tuning cotton of the invention is as follows:
when the low-frequency band is adjusted, irregular superfine hole (the diameter is 0.05-0.03 mm) tuning cotton is used for adjustment, and the principle is that the low-frequency wavelength is longer, and the wavelength is effectively compressed and released in a porous structure; when the medium frequency band is adjusted, tuning cotton with a microporous structure (the diameter is 0.1-0.5 mm) is used, and the principle is that the medium frequency wavelength is absorbed in the aperture through the friction of a hole frame to improve the audio effect of the medium frequency band; the high-frequency band has high sound frequency, is also a frequency band easy to generate high-frequency distortion, is most easy to generate according to the complexity of a space structure, is adjusted by using a tuning cotton material with a membrane structure (the diameter is 1.5-0.8 mm, and the membrane rate is 50-80%), has the principle that the high frequency is high in wavelength, has less loss of sound pressure through a large aperture, and absorbs high-frequency points through a membrane, so that the high frequency is adjusted.
Putting the tuning cotton manufactured in the first embodiment or the second embodiment into a generation cavity under the same experimental conditions, and comparing the instant absorption and release conditions of the generation cavity with the tuning cotton and the generation cavity without the tuning cotton on the energy of sound waves, as shown in fig. 1, 2 and 3:
fig. 1 shows that the curve of the low-frequency end is smooth after the tuning cotton is used, and partial effect is improved. This effect is equivalent to the effect of enlarging the cavity of the component, the small horn producing a loud sound.
Fig. 2 shows that the frequency point at the low frequency end is shifted and attenuated after the tuning cotton is used, so that the audio frequency is better and more stable in reproduction. The effect is that the audio frequency tends to be higher in the positive rotational wave audio frequency reduction rate, and the sound is more mellow.
Fig. 3 shows that the amplitude of the low-frequency end is obviously reduced after the tuning cotton is used, and the curve of the low-frequency end is smoother. This effect is a reduction in secondary interference generated during audio playback. The sound is less affected by spatial limitations.
Therefore, the tuning cotton is placed into the generation cavity, and the volume of the cavity is expanded through the consumption of instantaneous absorption and release of the energy of sound waves, so that the low frequency of the whole module is reduced (the effect is equal to that of expanding the cavity), and meanwhile, the sensitivity is reduced due to the consumption of the energy, and the frequency is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. The utility model provides a membrane structure tuning cotton for high frequency channel tuning, its characterized in that, the tuning cotton adopts the membrane structure, and its aperture is 0.8 ~ 1.5mm, and the diaphragm rate is 50 ~ 80%, and is less to the acoustic pressure loss through great aperture, thereby absorbs the frequency point of high frequency through the diaphragm simultaneously and adjusts the high frequency.
2. The manufacturing process of the membrane structure tuning cotton for tuning the high frequency band according to claim 1, which is characterized by comprising the following steps:
the method comprises the following steps of (1) preparing membrane structure tuning cotton by using polyurethane sponge as a raw material, physically cutting the raw material according to the compression ratio of the raw material of 1: 1-15: 1 to form a sheet to be hot-pressed, wherein the thickness of the sheet to be hot-pressed is 2-30 mm;
step (2), setting the pressure range of a hot press to be 10-300 kg, the hot pressing time range to be 5-90 s, the temperature to be 180-300 ℃ and the tooling to be 0.1-6 mm according to the thickness of the sheet to be hot pressed, and carrying out hot pressing, wherein the tooling refers to the thickness required by the sheet after hot pressing, and the pressure, the hot pressing time, the temperature and the tooling are increased along with the increase of the thickness of the sheet to be hot pressed;
step (3), naturally cooling the sheet subjected to hot pressing in the step (2) to room temperature to solidify the sheet, wherein the solidification time is 6 hours;
step (4), performing thickness detection on the sheet solidified in the step (3) by using a thickness gauge with the measuring head diameter of 30mm and the precision of 0.01 mm;
and (5) packaging the sheet with the thickness detected in the step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507670.5A CN110248305B (en) | 2016-04-19 | 2016-04-19 | Tuning cotton and manufacturing process thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610241130.3A CN106358132B (en) | 2016-04-19 | 2016-04-19 | A kind of manufacture craft of tuning cotton |
| CN201910507670.5A CN110248305B (en) | 2016-04-19 | 2016-04-19 | Tuning cotton and manufacturing process thereof |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610241130.3A Division CN106358132B (en) | 2016-04-19 | 2016-04-19 | A kind of manufacture craft of tuning cotton |
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| CN110248305A CN110248305A (en) | 2019-09-17 |
| CN110248305B true CN110248305B (en) | 2021-07-09 |
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| CN201910507670.5A Active CN110248305B (en) | 2016-04-19 | 2016-04-19 | Tuning cotton and manufacturing process thereof |
| CN201610241130.3A Active CN106358132B (en) | 2016-04-19 | 2016-04-19 | A kind of manufacture craft of tuning cotton |
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| CN110191386B (en) * | 2019-05-31 | 2021-03-19 | 歌尔科技有限公司 | External earphone |
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| CN201450572U (en) * | 2009-07-16 | 2010-05-05 | 徐江 | Sound box |
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| EP0729289B1 (en) * | 1995-02-23 | 1998-07-22 | Teijin Limited | Speaker damper and production method thereof |
| JP2001302991A (en) * | 2000-04-20 | 2001-10-31 | Lintec Corp | Adhesive tape for painting |
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| CN102967042B (en) * | 2012-11-29 | 2015-04-01 | 株洲时代新材料科技股份有限公司 | Sound-absorbing composite and preparation method thereof |
| CN203181224U (en) * | 2013-03-18 | 2013-09-04 | 东莞市佳宏通讯科技有限公司 | A horn damping cloth automatic pasting structure |
| CN203233522U (en) * | 2013-04-26 | 2013-10-09 | 易力声科技(深圳)有限公司 | In-ear earphone |
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| CN105430589B (en) * | 2015-10-30 | 2018-11-23 | 歌尔股份有限公司 | A kind of sound-absorbing component and preparation method thereof |
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- 2016-04-19 CN CN201910507670.5A patent/CN110248305B/en active Active
- 2016-04-19 CN CN201610241130.3A patent/CN106358132B/en active Active
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| US5504281A (en) * | 1994-01-21 | 1996-04-02 | Minnesota Mining And Manufacturing Company | Perforated acoustical attenuators |
| CN201450572U (en) * | 2009-07-16 | 2010-05-05 | 徐江 | Sound box |
| WO2012025874A1 (en) * | 2010-08-23 | 2012-03-01 | Knowles Electronics Asia Pte. Ltd. | Loudspeaker system with improved sound |
| CN203554661U (en) * | 2013-10-30 | 2014-04-16 | 周建国 | a kind of earphone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106358132B (en) | 2019-09-17 |
| CN110248305A (en) | 2019-09-17 |
| CN106358132A (en) | 2017-01-25 |
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