CN102876063B - Composite wood-based sound absorbing material, and production method thereof - Google Patents
Composite wood-based sound absorbing material, and production method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000002023 wood Substances 0.000 title claims abstract description 20
- 239000011358 absorbing material Substances 0.000 title abstract description 27
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 21
- 239000003063 flame retardant Substances 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 17
- 230000001070 adhesive effect Effects 0.000 claims abstract description 17
- 239000002025 wood fiber Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000004088 foaming agent Substances 0.000 claims abstract description 11
- 150000001875 compounds Chemical class 0.000 claims abstract 2
- 238000007731 hot pressing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 9
- 229920004935 Trevira® Polymers 0.000 claims 6
- 238000004513 sizing Methods 0.000 claims 5
- 230000002745 absorbent Effects 0.000 claims 3
- 239000002250 absorbent Substances 0.000 claims 3
- 238000007664 blowing Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- VVWRJUBEIPHGQF-MDZDMXLPSA-N propan-2-yl (ne)-n-propan-2-yloxycarbonyliminocarbamate Chemical compound CC(C)OC(=O)\N=N\C(=O)OC(C)C VVWRJUBEIPHGQF-MDZDMXLPSA-N 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 22
- 229920000728 polyester Polymers 0.000 abstract description 20
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 14
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical class NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 5
- 239000011094 fiberboard Substances 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 4
- VVWRJUBEIPHGQF-UHFFFAOYSA-N propan-2-yl n-propan-2-yloxycarbonyliminocarbamate Chemical compound CC(C)OC(=O)N=NC(=O)OC(C)C VVWRJUBEIPHGQF-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000012796 inorganic flame retardant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 241000771208 Buchanania arborescens Species 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- -1 phosphate ester Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 239000005696 Diammonium phosphate Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 235000012254 magnesium hydroxide Nutrition 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000006012 monoammonium phosphate Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- XFZRQAZGUOTJCS-UHFFFAOYSA-N phosphoric acid;1,3,5-triazine-2,4,6-triamine Chemical compound OP(O)(O)=O.NC1=NC(N)=NC(N)=N1 XFZRQAZGUOTJCS-UHFFFAOYSA-N 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
一种复合木质吸音材料，包括木质纤维、聚酯纤维、发泡剂和胶黏剂；所述木质纤维和聚酯纤维的比例为1:1-1:5（重量）；通过胶黏剂粘接复合；所述复合木质吸引材料的密度为0.2g/cm3—0.4 g/cm3，孔隙率为0.6—0.85，厚度为8mm—20mm。本发明所公开的这种复合木质吸音材料使用木纤维与聚酯纤维复合制成，比普通的吸音人造板在吸音性能上有所提高，吸音系数可达到0.8及以上；较聚酯纤维吸音人造板降低了制作成本。另外，在木纤维上加阻燃剂即可制成具有阻燃性能的吸音材料。另外，本发明还公开了上述吸音材料的制作方法。A composite wood sound-absorbing material, including wood fiber, polyester fiber, foaming agent and adhesive; the ratio of wood fiber to polyester fiber is 1:1-1:5 (by weight); Bonding compound; the density of the composite woody attracting material is 0.2g/cm 3 -0.4 g/cm 3 , the porosity is 0.6-0.85, and the thickness is 8mm-20mm. The composite wooden sound-absorbing material disclosed in the present invention is made of wood fiber and polyester fiber, which has improved sound-absorbing performance compared with ordinary sound-absorbing wood-based panels, and the sound-absorbing coefficient can reach 0.8 or above; board reduces manufacturing costs. In addition, adding a flame retardant to the wood fiber can make a sound-absorbing material with flame-retardant properties. In addition, the invention also discloses a manufacturing method of the above-mentioned sound-absorbing material.
Description
技术领域 technical field
本发明涉及一种吸音材料，特别涉及一种木纤维-聚酯纤维复合吸音材料。 The invention relates to a sound-absorbing material, in particular to a wood fiber-polyester fiber composite sound-absorbing material.
背景技术 Background technique
我国木质吸音材料近年来得到了迅速的发展，据统计，我们每年的木质吸音材料产量达到1000万m2以上。轻质木纤维板和聚酯纤维吸音板是两种比较常见的吸音板，轻质木纤维板为密度在0.4克/立方厘米以下的纤维板，这种吸音板密度低且多孔，具有良好的吸音和隔热性能，主要用于高级建筑（如剧院等）的吸音结构。此类吸音板的吸音系数NRC能达到0.5-0.7。但木质纤维板具有防潮性较差，强度低；并且纤维板胶量较大，不环保。聚酯纤维吸音板是由聚酯纤维模压而成，聚酯纤维吸音板是一种多孔材料，材料内部有大量微小的连通的孔隙，声波沿着这些孔隙可以深入材料内部，与材料发生摩擦作用将声能转化为热能，属多孔吸声材料，吸声特性是随着频率的增高吸声系数逐渐增大。但是聚酯纤维价格较高，而且属于化工产品，是非可循环利用的产品。 China's wood sound-absorbing materials have developed rapidly in recent years. According to statistics, our annual output of wood sound-absorbing materials has reached more than 10 million m 2 . Light wood fiberboard and polyester fiber sound-absorbing board are two common sound-absorbing panels. Light wood fiberboard is a fiberboard with a density below 0.4 g/cubic centimeter. Thermal performance, mainly used in sound-absorbing structures of advanced buildings (such as theaters, etc.). The sound absorption coefficient NRC of this kind of sound-absorbing panels can reach 0.5-0.7. However, wood fiberboard has poor moisture resistance and low strength; and the fiberboard has a large amount of glue, which is not environmentally friendly. Polyester fiber sound-absorbing panel is molded from polyester fiber. Polyester fiber sound-absorbing panel is a porous material with a large number of tiny connected pores inside the material. Sound waves can go deep into the material along these pores and rub against the material. It is a porous sound-absorbing material that converts sound energy into heat energy. The sound-absorbing characteristic is that the sound-absorbing coefficient gradually increases with the increase of frequency. However, the price of polyester fiber is relatively high, and it is a chemical product, which is not a recyclable product.
发明内容 Contents of the invention
针对现有技术存在的问题，本发明的目的在于提供一种由木纤维与聚酯纤维制成的复合木质吸音材料，该种吸引材料轻质、多孔，对高频和低频声波均有良好的吸收效果。本发明还公开了上述复合吸引材料的制作方法。 Aiming at the problems existing in the prior art, the object of the present invention is to provide a composite wood sound-absorbing material made of wood fiber and polyester fiber, which is light, porous, and has a good effect on high-frequency and low-frequency sound waves. absorption effect. The invention also discloses a manufacturing method of the composite attracting material.
为实现上述目的，本发明一种复合木质吸音材料包括木质纤维、聚酯纤维、发泡剂和胶黏剂；所述木质纤维和聚酯纤维的比例为1:1-1:5；通过胶黏剂粘接复合；所述复合木质吸引材料的密度为0.2g/cm3—0.4 g/cm3，孔隙率为0.6—0.85，厚度为8mm—20mm。 In order to achieve the above object, a composite wood sound-absorbing material of the present invention includes wood fiber, polyester fiber, foaming agent and adhesive; the ratio of the wood fiber and polyester fiber is 1:1-1:5; Adhesive bonding and compounding; the density of the composite wood-attracting material is 0.2g/cm3-0.4 g/cm3, the porosity is 0.6-0.85, and the thickness is 8mm-20mm.
进一步，所述胶黏剂为酚醛树脂胶黏剂，按木质纤维和聚酯纤维总量为100份（重量）计算，所述胶黏剂为8—12份（重量）。 Further, the adhesive is a phenolic resin adhesive, and the amount of the adhesive is 8-12 parts (weight) based on 100 parts (weight) of the total amount of wood fiber and polyester fiber.
进一步，所述聚酯纤维的长度为4mm-8mm，直径为10um—40um，截面形状为圆形、三角形或树枝形，。 Further, the length of the polyester fiber is 4mm-8mm, the diameter is 10um-40um, and the cross-sectional shape is circular, triangular or dendritic.
进一步，所述木纤维束长度10mm-20mm，直径为250um—1000um。 Further, the length of the wood fiber bundle is 10mm-20mm, and the diameter is 250um-1000um.
进一步，所述发泡剂为低温改性的偶氮二甲酰胺、碳酸氢盐、偶氮二甲酸二异丙酯。 Further, the foaming agent is low-temperature modified azodicarbonamide, bicarbonate, and diisopropyl azodicarboxylate.
进一步，所述木质复合吸音材料中还具有阻燃剂，所述阻燃剂为无机阻燃剂、有机阻燃剂或二者的混合物。 Further, the wood composite sound-absorbing material also contains a flame retardant, and the flame retardant is an inorganic flame retardant, an organic flame retardant or a mixture of the two.
上述复合木质吸音材料的制作方法，其特征在于，具体步骤为： The method for making the above-mentioned composite wood sound-absorbing material is characterized in that the specific steps are:
1）、将木质纤维、聚酯纤维、发泡剂和胶黏剂按设定比例放入模具内，以空气混合的方式进行充分混合，制成坯料； 1) Put the wood fiber, polyester fiber, foaming agent and adhesive into the mold according to the set ratio, and fully mix it by air mixing to make a blank;
2）、采用混合模压技术对所述步骤1中的坯料进行热压，制成密度为0.2g/cm3—0.4 g/cm3，孔隙率为0.6—0.85，厚度为8mm—20mm的板材。 2) Using hybrid molding technology to hot press the blank in step 1 to make a plate with a density of 0.2g/cm3-0.4 g/cm3, a porosity of 0.6-0.85, and a thickness of 8mm-20mm.
进一步，所述步骤1中所加入的发泡剂为偶氮二甲酰胺、碳酸氢盐偶氮二甲酸二异丙酯，胶黏剂为酚醛树脂胶黏剂。 Further, the foaming agent added in the step 1 is azodicarbonamide, bicarbonate diisopropyl azodicarboxylate, and the adhesive is a phenolic resin adhesive.
进一步，所述步骤2中的热压的压力为1-3Mpa，加压时间为0.5-5min；所述加热温度高于所使用发泡剂的发泡温度。 Further, the pressure of the hot pressing in step 2 is 1-3Mpa, and the pressing time is 0.5-5min; the heating temperature is higher than the foaming temperature of the foaming agent used.
进一步，步骤1中还包括加入设定比例的阻燃剂。 Further, step 1 also includes adding a flame retardant in a set proportion.
本发明所公开的这种复合木质吸音材料使用木纤维与聚酯纤维复合制成，比普通的吸音人造板在吸音性能上有所提高，吸音系数可达到0.8及以上；并且较聚酯纤维吸音人造板降低了制作成本；并且可以在木纤维上加阻燃剂制成具有阻燃性能的吸音材料。另外，本发明还公开了上述吸音材料的制作方法，该方法简单易行，省时省力。 The composite wooden sound-absorbing material disclosed in the present invention is made of wood fiber and polyester fiber, which has improved sound-absorbing performance compared with ordinary sound-absorbing wood-based panels, and the sound-absorbing coefficient can reach 0.8 or above; and it is more sound-absorbing than polyester fiber The wood-based panel reduces the production cost; and the wood fiber can be added with a flame retardant to make a sound-absorbing material with flame-retardant properties. In addition, the invention also discloses a method for making the above-mentioned sound-absorbing material, which is simple and easy, and saves time and effort.
具体实施方式 Detailed ways
本发明中的复合木质吸音材料由木质纤维和聚酯纤维按1:1-1:5的比例进行复合而成。聚酯纤维的长度为4mm-8mm，直径为10um—40um，截面形状为圆形、三角形、树枝形，纤维结构为实心或中空；木纤维束长度10mm-20mm，直径为250um—1000um；复合木质吸音材料的密度范围为0.2克/立方厘米—0.4克/立方厘米，孔隙率为0.6—0.85，厚度范围为8mm—20mm。 The composite wood sound-absorbing material in the present invention is composed of wood fiber and polyester fiber in a ratio of 1:1-1:5. The length of polyester fiber is 4mm-8mm, the diameter is 10um-40um, the cross-sectional shape is circular, triangular, dendritic, and the fiber structure is solid or hollow; the length of wood fiber bundle is 10mm-20mm, the diameter is 250um-1000um; composite wood The density range of the sound-absorbing material is 0.2 g/cm3-0.4 g/cubic cm, the porosity is 0.6-0.85, and the thickness range is 8mm-20mm.
采用上述复合木质吸音材料的制作步骤为： The manufacturing steps of adopting the above-mentioned composite wood sound-absorbing material are as follows:
1、将木质纤维、聚酯纤维发泡剂和胶黏剂按设定比例放入模具内，以空气混合的方式进行充分混合，制成坯料；其中，胶黏剂可采用酚醛树脂胶黏剂、三聚氰胺树脂胶黏剂或者异氰酸酯胶黏剂，胶黏剂的比例采用8%—12%（按固体树脂质量相对绝干纤维质量）的比例进行，比例为8%-12%的发泡剂可为低温改性的偶氮二甲酰胺、碳酸氢盐、偶氮二甲酸二异丙酯等。其中，低温改性的偶氮二甲酰胺分解峰值温度约为138℃；碳酸氢盐，以碳酸氢钠为例，分解温度为60℃-150℃；偶氮二甲酸二异丙酯分解温度为100℃左右。 1. Put the wood fiber, polyester fiber foaming agent and adhesive into the mold according to the set ratio, and fully mix them with air to make a blank; among them, the adhesive can be phenolic resin adhesive , melamine resin adhesive or isocyanate adhesive, the proportion of adhesive is 8%-12% (according to the mass of solid resin relative to the mass of dry fiber), and the proportion of 8%-12% foaming agent can be It is low-temperature modified azodicarbonamide, bicarbonate, diisopropyl azodicarboxylate, etc. Among them, the decomposition peak temperature of low-temperature modified azodicarbonamide is about 138°C; bicarbonate, taking sodium bicarbonate as an example, the decomposition temperature is 60°C-150°C; the decomposition temperature of diisopropyl azodicarboxylate is Around 100°C.
2、采用混合模压技术对步骤1中的坯料进行热压，制成厚度为8 mm -20mm吸音板。该步骤中的热压所采用的压力、加压时间可根据制作板材厚度设定，通常为1-3Mpa，加压时间为0.5-5min；并根据所采用的发泡剂种类，设定热压加热温度。例如，选用的发泡剂为低温改性偶氮二甲酰胺，胶黏剂为酚醛树脂胶黏剂，压制的单位压力为1.5Mpa，加压时间为1mm/min，热压温度为150℃。压制可采用辊压机或其他压机完成。 2. Use hybrid molding technology to hot press the blank in step 1 to make a sound-absorbing panel with a thickness of 8mm-20mm. The pressure and pressing time used in the hot pressing in this step can be set according to the thickness of the plate, usually 1-3Mpa, and the pressing time is 0.5-5min; and according to the type of foaming agent used, set the hot pressing heating temperature. For example, the selected foaming agent is low-temperature modified azodicarbonamide, the adhesive is phenolic resin adhesive, the unit pressure of pressing is 1.5Mpa, the pressing time is 1mm/min, and the hot pressing temperature is 150°C. Compression can be done with roller presses or other presses.
3、根据具体需求对经过辊压后的板材进行剪裁；制成各种规格的多孔性吸音材料。 3. According to the specific needs, the rolled plate is cut; it is made into porous sound-absorbing materials of various specifications.
本发明中的复合木质吸音材料通过驻波管对吸音材料进行吸音系数的测定，吸音系数NRC可达到0.8，吸音性能明显优于目前所普遍采用的两种吸音材料。 The composite wooden sound-absorbing material in the present invention measures the sound-absorbing coefficient of the sound-absorbing material through a standing wave tube, and the sound-absorbing coefficient NRC can reach 0.8, and the sound-absorbing performance is obviously better than the two kinds of sound-absorbing materials commonly used at present.
另外，在复合木质吸音材料中的木纤维上加阻燃剂制成具有阻燃性能的吸音材料。所添加的阻燃剂可以是无机阻燃剂、有机阻燃剂或二者的混合物，应在步骤1中与其他材料共混。无机阻燃剂为：氢氧化铝、氢氧化镁、磷酸一铵、磷酸二铵、氯化铵、硼酸盐等，有机阻燃剂为：卤系、磷酸酯、卤代磷酸酯等。如添加磷酸三聚氰胺阻燃剂，即可将上述吸音材料制成吸音阻燃材料。 In addition, adding a flame retardant to the wood fiber in the composite wood sound-absorbing material makes a sound-absorbing material with flame-retardant properties. The added flame retardant can be an inorganic flame retardant, an organic flame retardant or a mixture of both, and should be blended with other materials in step 1. Inorganic flame retardants are: aluminum hydroxide, magnesium hydroxide, monoammonium phosphate, diammonium phosphate, ammonium chloride, borate, etc. Organic flame retardants are: halogen series, phosphate ester, halogenated phosphate ester, etc. If melamine phosphate flame retardant is added, the above-mentioned sound-absorbing materials can be made into sound-absorbing and flame-retardant materials.
Claims (1)
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| CN105237033B (en) * | 2015-09-06 | 2018-11-30 | 歌尔股份有限公司 | Sound-absorbing material preparation method, sound-absorbing material and its fill method |
| CN105504189A (en) * | 2015-12-30 | 2016-04-20 | 王丽萍 | Durable fiber board for building |
| CN105623200A (en) * | 2016-02-17 | 2016-06-01 | 江苏瑞赛恩建材实业有限公司 | Sound absorption plate with long service life |
| CN106497112A (en) * | 2016-10-11 | 2017-03-15 | 常州市鼎升环保科技有限公司 | A kind of preparation method of anti-corrosion moisture resistance Plant fiber's acoustic board |
| CN106867209A (en) * | 2016-12-29 | 2017-06-20 | 安徽鸿润装饰材料有限公司 | A kind of PET acoustic tiles and preparation method thereof |
| CN107083074A (en) * | 2017-06-04 | 2017-08-22 | 李家友 | A kind of preparation method of the ageing-resistant acoustic tile based on alkali lignin base |
| CN108202376A (en) * | 2018-01-03 | 2018-06-26 | 中山市大涌镇生产力促进中心 | A kind of lighting solid wood profile and its manufacturing method |
| CN109732017A (en) * | 2019-01-10 | 2019-05-10 | 中铁北京工程局集团有限公司 | A kind of Noise Suppression Device in steel bar stretching |
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| US8403108B2 (en) * | 2009-06-12 | 2013-03-26 | Precision Fabrics Group, Inc. | Acoustically tunable sound absorption articles and methods of making same |
| CN202292954U (en) * | 2011-10-27 | 2012-07-04 | 昆山吉美川纤维科技有限公司 | System for preparing polyester fiber plant fiberboard |
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