JPH10119220A - Production of sound absorbing material - Google Patents
Production of sound absorbing materialInfo
- Publication number
- JPH10119220A JPH10119220A JP9022880A JP2288097A JPH10119220A JP H10119220 A JPH10119220 A JP H10119220A JP 9022880 A JP9022880 A JP 9022880A JP 2288097 A JP2288097 A JP 2288097A JP H10119220 A JPH10119220 A JP H10119220A
- Authority
- JP
- Japan
- Prior art keywords
- film
- absorbing material
- sound absorbing
- sound
- urethane foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は吸音材の製造方法に
関し、さらに詳しくは防水性、吸音性に優れ、必要に応
じて耐引裂性の改良された吸音材をエネルギーロスが小
さく、短時間で、簡便に製造できる方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sound absorbing material, and more particularly, to a method for producing a sound absorbing material having excellent waterproofness and sound absorbing properties, and having improved tear resistance as required, with a small energy loss and a short time. And a method that can be easily manufactured.
【０００２】[0002]
【従来の技術】建設用機械、自動車のエンジンルーム、
一般の屋外物品等に使用される吸音材は少なくとも防水
性と低〜中周波数域の吸音性の向上が求められ、またこ
のような吸音材を低エネルギーロス、短時間で、簡便に
製造できる方法が強く要請されている。詳しくは上記の
ような吸音材は吸音性を向上させるため、通気性を持た
せることになるが雨や水洗等により、吸音材に水が侵入
し、水はけが悪く、内部にたまってしまうことが多く、
そのため吸音性が悪化すると共に、吸音材の劣化が早ま
り、耐久性も低下する。従って防水性を向上させること
が必要となる。また、軟質ウレタンフォームは公知であ
るがこの単体では防水性、低〜中周波数域の吸音性を満
足することができない。2. Description of the Related Art Construction machinery, automobile engine rooms,
A sound absorbing material used for general outdoor articles or the like is required to have at least improved waterproofness and sound absorbing property in a low to middle frequency range, and a method for easily producing such a sound absorbing material with low energy loss, in a short time, and easily. Is strongly requested. In detail, the sound absorbing material as described above is made to have air permeability in order to improve the sound absorbing property, but water enters the sound absorbing material due to rain, washing with water, etc., the drainage is bad, and the sound absorbing material may accumulate inside. Many,
For this reason, the sound absorbing property is deteriorated, the deterioration of the sound absorbing material is accelerated, and the durability is also reduced. Therefore, it is necessary to improve waterproofness. In addition, flexible urethane foams are known, but cannot be used alone to satisfy waterproofness and sound absorption in a low to middle frequency range.
【０００３】低〜中周波数域の吸音性を向上する方法に
は、特開昭６１−５３０３５号等が知られている。この
方法は通常の軟質ウレタンフォームに通気性を付与した
プラスチックフィルムを熱融着積層することにより吸音
性を改良するものである。しかし、熱融着によって特定
の通気性を有する吸音材を製造するには様々な困難を伴
う。As a method for improving sound absorption in a low to middle frequency range, Japanese Patent Application Laid-Open No. Sho 61-53035 is known. According to this method, sound absorption is improved by heat-sealing and laminating a plastic film having air permeability to ordinary soft urethane foam. However, various difficulties are involved in producing a sound-absorbing material having a specific air permeability by heat fusion.
【０００４】例えば、単純に軟質ウレタンフォームの上
に熱融着性フィルムを積層し、その上から熱盤にて加熱
した場合、フィルムの融着時間経過後そのまま熱盤を離
脱させると熱盤にフィルムがくっついてしまい、貼り合
わせることができない。これは、フィルムが融けてるう
ちに熱盤を例えば上下に動かしたためであり、この対策
としては熱盤を冷却後、すなわちフィルムを固化させた
後、吸音材を熱盤から離脱させる必要がある。この加熱
後冷却するということは、初歩的な方法であるが、熱盤
の加熱と冷却を繰り返すという事は、エネルギーロスが
大きく、効率も悪く時間がかかる方法である。[0004] For example, when a heat-fusible film is simply laminated on a soft urethane foam and heated with a hot platen from above, if the hot platen is removed as it is after the fusion time of the film, the hot platen is formed. The film sticks and cannot be bonded. This is because the hot platen was moved up and down, for example, while the film was melting. As a countermeasure, it is necessary to separate the sound absorbing material from the hot platen after cooling the hot platen, that is, after solidifying the film. Cooling after heating is a rudimentary method, but repeating heating and cooling of a hot platen is a method with a large energy loss, low efficiency, and a long time.
【０００５】このように、従来技術では防水性と低〜中
周波数域での高吸音性、必要に応じて高耐引裂性を満足
する吸音材を、低エネルギーロス、短時間で、簡便に製
造する方法は知られていないのが現状である。As described above, according to the prior art, a sound-absorbing material which satisfies waterproofness, high sound absorption in a low to medium frequency range, and high tear resistance as required can be easily manufactured with low energy loss and in a short time. It is currently unknown how to do this.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記事実に
鑑みてなされたものであり、本発明の目的は防水性及び
吸音性に優れ、必要に応じて耐引裂性が向上した吸音材
を効率よく、簡便に製造する方法を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to provide a sound-absorbing material having excellent waterproofing and sound-absorbing properties and, if necessary, improved tear resistance. An object of the present invention is to provide a method for efficiently and easily producing the composition.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために、軟質ウレタンフォームとフィルム積
層吸音材の製造方法に着目して、軟質ウレタンフォーム
にフィルムを積層し熱融着によって特定の通気性を発現
させるには、効率よくフィルムを接着させる方法とし
て、熱盤を加熱したままフィルム付吸音材を熱盤から離
脱させれば、エネルギーのロスも小さく貼り合わせ時間
も少ないと考え、熱盤への付着を防止するため、熱盤へ
離型剤の塗布や離型の良いテフロンフィルムの貼り付け
などを検討したが課題を解決できず、結局離型紙を熱盤
と吸音材のフィルムとの間に積層することによって、初
めて課題が解決できるという新知見が得られ、すなわ
ち、下記の手段により、本発明の目的が達成できること
を見出し、本発明を完成するに至った。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors focused on a method for producing a flexible urethane foam and a film-laminated sound absorbing material, and laminated a film on the flexible urethane foam and heat-sealed the film. In order to express the specific air permeability by, as a method of bonding the film efficiently, if the sound absorbing material with a film is separated from the hot plate while heating the hot plate, the energy loss is small and the bonding time is short. Thought, to prevent adhesion to the hot platen, we examined applying a release agent to the hot platen and attaching a Teflon film with good release, but we could not solve the problem, and eventually released the release paper with the hotplate and sound absorbing material The new finding that the problem can be solved for the first time can be obtained by laminating the film with the above film. That is, the inventors have found that the object of the present invention can be achieved by the following means, This has led to the.
【０００８】すなわち（１）本発明の吸音材の製造方法
は、軟質ウレタンフォーム上にフィルムを重ね合わせ、
その上に離型紙を積層し、離型紙側から、熱盤にて加圧
加熱して、該軟質ウレタンフォームと該フィルムを溶融
接着させ、加熱熱盤から積層物を取り出し、フィルムの
固化後、この積層物から、離型紙を取り除き、フィルム
表面から１０ｍｍ厚さ部分の通気性が５〜８０ｍｌ／ｃ
ｍ2 ・秒である吸音材を得ることを特徴とする。That is, (1) In the method for producing a sound absorbing material of the present invention, a film is laminated on a soft urethane foam,
Laminating the release paper on it, from the release paper side, pressurize and heat with a hot plate, melt-bond the soft urethane foam and the film, take out the laminate from the heating hot plate, after solidification of the film, The release paper was removed from the laminate, and the air permeability of the portion having a thickness of 10 mm from the film surface was 5 to 80 ml / c.
It is characterized by obtaining a sound absorbing material of m 2 · sec.
【０００９】（２）本発明の吸音材の製造方法は、前
（１）項において、前記軟質ウレタンフォームが難燃性
軟質ウレタンフォームであることを特徴とする。(2) The method for producing a sound-absorbing material according to the present invention is characterized in that in (1), the soft urethane foam is a flame-retardant soft urethane foam.
【００１０】（３）本発明の吸音材の製造方法、前
（１）項において、前記フィルムがポリエステルフィル
ム又はポリエチレンフィルムであることを特徴とする。(3) The method for producing a sound-absorbing material of the present invention, wherein in the above (1), the film is a polyester film or a polyethylene film.
【００１１】（４）本発明の吸音材の製造方法は、前
（１）項において、前記フィルムがホットメルト接着剤
を要しないポリエステルフィルム又はポリエチレンフィ
ルムであることを特徴とする。 （５）本発明の吸音材の製造方法は、前（１）項におい
て、前記加圧加熱の温度がフィルムの融点より３℃以上
であることを特徴とする。 （６）本発明の吸音材の製造方法は、前（１）項におい
て、前記軟質ウレタンフォーム上にフィルムを重ね合わ
せ、このフィルム面に、さらに通気性が５ｍｌ／ｃｍ2
・秒以上で、可撓性のある樹脂織物又は樹脂不織布を積
層してなることを特徴とする。 （７）本発明の吸音材の製造方法は、前（６）項におい
て、前記樹脂織物又は樹脂不織布がそれぞれナイロン織
物又はナイロン不織布であることを特徴とする。(4) The method for producing a sound-absorbing material according to the present invention is characterized in that, in the above item (1), the film is a polyester film or a polyethylene film which does not require a hot melt adhesive. (5) The method for producing a sound-absorbing material of the present invention is characterized in that, in the above item (1), the temperature of the pressurizing and heating is 3 ° C. or higher than the melting point of the film. (6) In the method for producing a sound-absorbing material of the present invention, in the above item (1), a film is superposed on the flexible urethane foam, and the film surface is further provided with air permeability of 5 ml / cm 2.
-It is characterized by laminating a flexible resin woven fabric or resin non-woven fabric in seconds or more. (7) The method for producing a sound-absorbing material of the present invention is characterized in that in the above item (6), the resin woven fabric or the resin nonwoven fabric is a nylon woven fabric or a nylon nonwoven fabric, respectively.
【００１２】以下に本発明を詳細に説明する。本発明の
吸音材の製造方法において、用いられる軟質ウレタンフ
ォームとしては、一般の軟質ウレタンフォーム及び難燃
性軟質ウレタンフォームを挙げることができる。一般の
軟質ウレタンフォームとしては、エバーライトＦＬ、Ｔ
Ｌ、ＪＹ（ブリヂストン製 商品名）が含まれる。また
難燃性軟質ウレタンフォームとしてはＵＬ−９４、ＨＦ
−１、ＭＶＳＳ３０２、空検、Ａ−Ａ基準等に適合する
軟質ウレタンフォームであれは特に制限されないが例え
ばエバーライトＶＨＺ、ＶＰ、ＶＤ（商品名、プリヂス
トン製）、等を挙げることができる。これらのうち、吸
音材の用途面から難燃性軟質ウレタンフォームが多く用
いられる。Hereinafter, the present invention will be described in detail. In the method for producing a sound absorbing material of the present invention, examples of the soft urethane foam used include general soft urethane foam and flame-retardant soft urethane foam. General soft urethane foams include Everlite FL, T
L and JY (Bridgestone brand name) are included. UL-94, HF as flame-retardant soft urethane foam
-1, MVSS302, blank inspection, soft urethane foam conforming to the AA standard and the like are not particularly limited, and examples thereof include Everlite VHZ, VP, VD (trade name, manufactured by Princeton) and the like. Of these, flame-retardant soft urethane foams are often used in terms of the use of the sound absorbing material.
【００１３】これら軟質ウレタンフォームの厚さは利用
分野からみて、１０〜１００ｍｍであり、好ましくは１
０〜５０ｍｍである。The thickness of these flexible urethane foams is from 10 to 100 mm, preferably from 1 to 100 mm, in view of the field of use.
0 to 50 mm.
【００１４】軟質ウレタンフォームの片面に積層溶融接
着させるフィルムとして好ましくはポリエステルフィル
ム又はポリエチレンフィルムが用いられるがこれらのフ
イルムの接着に通常用いられるホットメルト接着剤を要
しない、融点が８０〜１６０℃のポリエステルフィルム
又はポリエチレンフィルムがさらに好ましい。中でもポ
リエステルが好ましい。フィルムの融点は低いほど、低
温で溶融でき作業性はよい。しかし、製品性能からみて
使用温度が高くなると、フィルムが溶けたり、はがれた
りして不具合が発生し易い。製品性能からは融点は高い
ほうがよい。量的には車両用として使用されることが多
く、その場合、融点は１００〜１３０℃のものが好まし
い。ホットメルト接着剤がなくても該ウレタンフォーム
とこのフィルムは熱融着が可能である。接着剤不要であ
るので工程が軽減でき、経済的にも利点があり、同時に
防水性、吸音性には何ら影響しない。A polyester film or a polyethylene film is preferably used as a film to be laminated and melt-bonded to one side of a flexible urethane foam, but a hot melt adhesive usually used for bonding these films is not required. Polyester films or polyethylene films are more preferred. Among them, polyester is preferred. As the melting point of the film is lower, the film can be melted at a lower temperature and the workability is better. However, when the operating temperature is high in view of the product performance, the film is likely to melt or peel off, causing problems. The higher the melting point, the better from the product performance. It is often used for vehicles in terms of quantity, in which case the melting point is preferably 100 to 130 ° C. Even without the hot melt adhesive, the urethane foam and this film can be heat-sealed. Since no adhesive is required, the number of steps can be reduced, which is economically advantageous, and at the same time, has no effect on waterproofness and sound absorption.
【００１５】本発明に用いられるフィルムとしては、例
えばＥＶＡ、変性ＥＶＡ、ポリエチレン、ポリプロピレ
ン、ポリエステル、ポリアミド、ポリウレタン等のホッ
トメルトフィルムが使用されるが中でも、ポリエステル
フィルム及びポリエチレンフィルムが好ましいのはいず
れも可燃性であるにもかかわらず、難燃性軟質ウレタン
フォームと積層することにより、メカニズムは不明であ
るが難燃性が低下しないことにより、難燃性吸音材用に
適している。また、本発明における吸音材は防水性に優
れているがこの防水性を向上するため、フィルムの材質
に着目して検討した結果、水との接触角の大きい、すな
わち撥水性の大きなポリエステルフィルム、ポリエチレ
ンフィルムが水の侵入を小さくする、つまり防水性に優
れていることがわかったがこれも好ましい理由である。As the film used in the present invention, for example, hot melt films such as EVA, modified EVA, polyethylene, polypropylene, polyester, polyamide, and polyurethane are used. Among them, polyester film and polyethylene film are preferable. Although it is flammable, its mechanism is not known by laminating it with a flame-retardant soft urethane foam, but its flame retardancy does not decrease, so that it is suitable for a flame-retardant sound-absorbing material. In addition, the sound absorbing material of the present invention is excellent in waterproofness, but in order to improve this waterproofness, as a result of study focusing on the material of the film, a large contact angle with water, that is, a polyester film having a large water repellency, It has been found that the polyethylene film reduces the penetration of water, that is, is excellent in waterproofness, which is also a preferable reason.
【００１６】本発明に用いられるフィルムの厚さは１０
〜１００μｍであり、効果の点から好ましくは１５〜５
０μｍである。この厚みが１０μｍ未満では加工作業性
が悪い点から、また１００μｍを越えるとコストアップ
の点から好ましくない。The thickness of the film used in the present invention is 10
From 100 to 100 μm, and preferably from 15 to 5
0 μm. If the thickness is less than 10 μm, processing workability is poor, and if it exceeds 100 μm, it is not preferable from the viewpoint of cost increase.
【００１７】本発明の吸音材のフィルム表面から１０ｍ
ｍ厚さ部分の通気性は５〜８０ｍｌ／ｃｍ2 ・秒であ
り、効果の点から好ましくは１０〜２５ｍｌ／ｃｍ2 ・
秒である。通気性が５ｍｌ／ｃｍ2 ・秒未満では通気性
のないフィルム積層品に類似し、吸音性能低下の点か
ら、８０ｍｌ／ｃｍ2 ・秒を越えるとフォーム単体に近
づき吸音性能低下の点から好ましくない。通気性の特定
に当り、吸音材の厚さ変量による通気性と吸音性の関係
を検討した結果、フィルム表面から１０ｍｍ厚さ部分の
通気性と低〜中周波数域の吸音性が特に密接に関連して
いることがわかったので、本発明では通気性の規定を、
この厚みにおける値としている。10 m from the film surface of the sound absorbing material of the present invention
The air permeability of the m-thick part is 5 to 80 ml / cm 2 · second, and preferably 10 to 25 ml / cm 2 ·
Seconds. If the air permeability is less than 5 ml / cm 2 · second, it is similar to a film laminate having no air permeability, and from the viewpoint of sound absorbing performance decrease, if it exceeds 80 ml / cm 2 · second, it approaches the foam alone and the sound absorbing performance is unfavorable. . In examining the air permeability, we examined the relationship between the air permeability and the sound absorption due to the thickness variation of the sound absorbing material, and found that the air permeability at a thickness of 10 mm from the film surface and the sound absorption in the low to medium frequency range are particularly closely related. Because it was found that, in the present invention, the provision of air permeability,
The value at this thickness is used.
【００１８】本発明に用いられる離型紙としては、制限
されないが例えば表面にシリコンコートしてある離型
紙、離型フィルム等を挙げることができる。The release paper used in the present invention is not limited, but examples thereof include release paper and a release film whose surface is coated with silicon.
【００１９】本発明の製造方法による吸音材において、
使用目的によって、溶融接着させたフィルムに高度の耐
引裂性が要求される場合には、フィルム面に、通気性が
５ｍｌ／ｃｍ2 ・秒以上で、可撓性のある樹脂織物又は
樹脂不織布をフィルムの補強材として積層することによ
り、吸音材の他の特性を損うことなく耐引裂性を大幅に
向上することができる。In the sound absorbing material according to the production method of the present invention,
When a high degree of tear resistance is required for a melt-bonded film depending on the purpose of use, a flexible resin woven fabric or resin non-woven fabric having air permeability of 5 ml / cm 2 sec or more is applied to the film surface. By laminating as a film reinforcing material, the tear resistance can be significantly improved without impairing other characteristics of the sound absorbing material.
【００２０】本発明に用いることができる樹脂織物又は
樹脂不織布は通気性が５ｍｌ／ｃｍ 2 ・秒以上であっ
て、可撓性を有するものであればよく、特に制限されな
い。この場合、例えば通気性が８０ｍｌ／ｃｍ2 ・秒以
上のものも使うことができる。この樹脂織物としては、
例えばナイロントリコット１５ｄ（打込み本数；タテ２
８本、ヨコ２０本、太さ；１５ｄ（デニール）、通気
性；４００ｍｌ／ｃｍ2 ・秒以上）（商品名、ナイロン
トリコット１５ｄ、桐生トリコット社製）、ナイロント
リコット３０ｄ（打込み本数；タテ２８本、ヨコ４０
本、太さ；３０ｄ、通気性；４００ｍｌ／ｃｍ2 ・秒以
上）（商品名、ナイロントリコット３０ｄ、桐生トリコ
ット社製）等を挙げることができる。また、上記樹脂不
織布としては、例えばナイロン不織布（目付量；２０ｇ
／ｍ2 、通気性；４００ｍｌ／ｃｍ2 ・秒以上）、ナイ
ロン不織布（目付量；３０ｇ／ｍ2 、通気性；４００ｍ
ｌ／ｃｍ 2 ・秒以上）等を挙げることができる。The resin woven fabric which can be used in the present invention or
Resin non-woven fabric has air permeability of 5ml / cm Two・ It is more than seconds
Is not particularly limited as long as it has flexibility.
No. In this case, for example, the air permeability is 80 ml / cm.Two・ Second
The above can also be used. As this resin fabric,
For example, a nylon tricot 15d (number of driving; vertical 2
Eight, 20 horizontal, thickness; 15d (denier), ventilation
Properties: 400ml / cmTwo-Seconds or more) (Product name, nylon
Tricot 15d, manufactured by Kiryu Tricot), nylon
Ricott 30d (number of shots: 28 vertical, 40 horizontal)
Book, thickness: 30d, air permeability: 400ml / cmTwo・ Second
Above) (Product name, Nylon Tricot 30d, Kiryu Toriko
And the like). In addition, the resin
As the woven fabric, for example, a nylon nonwoven fabric (basis weight: 20 g)
/ MTwo, Breathability; 400ml / cmTwo-Seconds or more)
Ron non-woven fabric (weight per unit area: 30 g / mTwo, Breathable; 400m
l / cm Two-Seconds or more).
【００２１】上記、樹脂織物、樹脂不織布の中で、目の
細かい（打込み本数の多い、太さの大きい、目付量の大
きい、通気性の小さい）ものはフィルムの耐引裂性（補
強性）が大きくなるが現状ではそれ程の耐引裂性は必要
とされず、高価であり、さらに吸音材の通気性が小さく
なり、難燃性の観点から不利であるのに対し、目の粗い
（打込み本数の少ない、太さの小さい、目付量の小さ
い、通気性の大きい）ものは耐引裂性は要求特性を満た
し、安価であり、さらに吸音材の通気性が大きくなり、
難燃性の観点から有利である。この観点から前記例示の
中でも、ナイロントリコット１５ｄやナイロン不織布
（目付量：２０ｇ／ｃｍ2 ）が好ましく用いられる。Among the above-mentioned resin woven fabrics and resin non-woven fabrics, those having fine eyes (a large number of punches, a large thickness, a large basis weight, and a small air permeability) have a tear resistance (reinforcing property) of the film. At the present time, it does not require such tear resistance and is expensive. In addition, the sound-absorbing material has low air permeability and is disadvantageous in terms of flame retardancy. (Small, small in thickness, small in weight, large in air permeability) meet the required characteristics of tear resistance, are inexpensive, and the sound-absorbing material has high air permeability,
It is advantageous from the viewpoint of flame retardancy. From this viewpoint, among the above examples, nylon tricot 15d and nylon nonwoven fabric (basis weight: 20 g / cm 2 ) are preferably used.
【００２２】本発明の吸音材は軟質ウレタンフォーム上
にフィルムをホットメルト接着剤なしに重ね合わせ、そ
の上に離型紙を積層し、離型紙側から、熱盤にて加圧加
熱して、該軟質ウレタンフォームとフィルムを溶融接着
させ、熱盤を加熱したまま、熱盤から、離型紙を積層し
た積層物を取り出し、フィルムを固化後、離型紙を取り
除くことにより、前記した吸音材を低エネルギーロス、
短時間で、簡便に製造される。The sound-absorbing material of the present invention is obtained by laminating a film on a soft urethane foam without using a hot-melt adhesive, laminating a release paper thereon, and pressing and heating the release paper side with a hot platen. By melting and bonding the soft urethane foam and the film, and taking out the laminate obtained by laminating release paper from the hot plate while heating the hot plate, solidifying the film and removing the release paper, the above-mentioned sound absorbing material is reduced in energy. Loss,
It is easy to manufacture in a short time.
【００２３】また、必要に応じて、上記フィルムの上
に、フィルム補強材として樹脂織物又は樹脂不織布を積
層し、その上に離型紙を積層して、上記と同様にして、
フィルム補強材を有する吸音材を製造することができ
る。また、ここで目の細かい樹脂織物又は樹脂不織布を
用いる場合、フィルムが熱盤にべたつかないことが多い
ので、必ずしも離型紙を用いなくてもよい。Further, if necessary, a resin woven fabric or a resin nonwoven fabric is laminated as a film reinforcing material on the above-mentioned film, and a release paper is laminated thereon.
A sound absorbing material having a film reinforcing material can be manufactured. When a finely woven resin woven fabric or a non-woven resin fabric is used here, the film often does not stick to the hot platen, so that it is not always necessary to use release paper.
【００２４】この製造方法において、加圧加熱温度はフ
ィルムの融点より３℃以上、効果の点から好ましくは３
〜１５℃である。しかしあまり高温すぎても過度の通気
性の点から好ましくない。この加熱温度は吸音材のフィ
ルムに大きな通気性を与えるための最大要因である。フ
ィルムが溶融しているときに軟質ウレタンフォームとフ
ィルムとの圧着における圧力を上げたり、溶融時間を長
くしても通気性は増大しない。この加熱温度はフィルム
の溶融温度と関係があり、各フィルム特性に応じて加熱
温度を設定する必要がある。例えば図１は吸音材のフィ
ルムとしてポリエステルフィルム（Ｄ２８１０、商品
名、ダイセル社製、融点１１５℃）を用いたときの、プ
レス成型装置の熱盤温度と吸音材の通気性の関係を示し
た図である。この図に示されるように、熱盤温度１２０
℃以上では温度の上昇と共に通気性が増大することがわ
かる。In this manufacturing method, the heating temperature under pressure is 3 ° C. or higher than the melting point of the film, and preferably 3 ° C. from the viewpoint of the effect.
１５15 ° C. However, too high temperatures are not preferred because of excessive air permeability. This heating temperature is the largest factor for providing a large air permeability to the sound absorbing material film. Even if the pressure in the pressing between the flexible urethane foam and the film is increased while the film is being melted, or if the melting time is lengthened, the air permeability does not increase. This heating temperature is related to the melting temperature of the film, and it is necessary to set the heating temperature according to each film characteristic. For example, FIG. 1 is a diagram showing the relationship between the hot platen temperature of the press molding apparatus and the air permeability of the sound absorbing material when a polyester film (D2810, trade name, manufactured by Daicel, melting point 115 ° C.) is used as the sound absorbing material film. It is. As shown in FIG.
It is found that when the temperature is higher than ℃, the air permeability increases with the temperature.
【００２５】吸音性は吸音材の通気性に比例して大きく
なる（ただし、低−中周波数域の吸音性向上には前記の
ように通気性に限界はあるが）ので、通気性が必要とな
る。そのためには吸音材のフィルムに通気性を賦与する
必要がある。本発明の吸音材が通気性を発現するのは、
軟質ウレタンフォームのように表面がポーラスなものと
離型紙間にフィルムを積層し、加熱によりフィルムをフ
ォームに溶融接着させ、冷却固化させた場合、フィルム
の凹凸なポーラス面でフィルムに穴があいて通気性が得
られる。The sound absorbing property increases in proportion to the air permeability of the sound absorbing material (however, there is a limit to the sound absorbing property in the low to middle frequency range as described above). Become. For this purpose, it is necessary to impart air permeability to the sound absorbing material film. The sound absorbing material of the present invention expresses air permeability,
When laminating a film between a porous material such as flexible urethane foam and release paper, melting and bonding the film to the foam by heating and solidifying by cooling, the film has holes on the uneven porous surface of the film. Air permeability is obtained.
【００２６】また、本発明の吸音材の製造方法におい
て、熱盤を軟質ウレタンフォーム側に配置する方法もあ
るが、作業性が悪くなるので好ましくない。ただし、連
続して加熱できる装置を使用すれば、作業性の問題はな
くなる。しかし、回分装置で作業する場合は、熱盤を離
型紙側に配置することで、加熱時間のバラツキが小さく
なり、製品品質が良好となる。In the method of manufacturing a sound absorbing material of the present invention, there is a method of disposing a hot plate on the soft urethane foam side, but this is not preferable because workability is deteriorated. However, if a device capable of continuous heating is used, the problem of workability is eliminated. However, when working with a batch apparatus, by disposing the hot platen on the release paper side, variations in the heating time are reduced, and the product quality is improved.
【００２７】[0027]
【実施例】以下に実施例を挙げて、本発明をより具体的
に説明するが、本発明の主旨を越えない限り、本実施例
に限定されるものではない。EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention.
【００２８】各種の測定は下記の方法によった。 ・防水性の測定方法 防水性は水の侵入を防ぐ性能であるが、その代表特性と
して吸音材の吸水量とフィルムの水との接触角を用い
た。吸水量は図２の吸水量測定装置１０を用いて測定し
た。吸音材１４を支持台１２に固定し、吸音材カバー１
６で吸音材の一部をカバーし、一定の面積（直径８０ｍ
ｍ）の露出した円形吸音材部分に一定量（５００ｍｌ）
の水を１分間にわたって散水器１８より放水し、吸音材
の吸水量を測定した。接触角は協和接触角計を用いて液
適法の方法で測定した。吸水量は小さい程（フィルムの
水との接触角は大きい程）防水性は良好と評価する。Various measurements were made according to the following methods.・ Waterproofness measurement method Waterproofness is the ability to prevent water from entering, and as its representative characteristics, the water absorption of the sound absorbing material and the contact angle between the film and water were used. The water absorption was measured using the water absorption measuring device 10 of FIG. The sound absorbing material 14 is fixed to the support base 12 and the sound absorbing material cover 1 is fixed.
6 covers a part of the sound absorbing material and has a certain area (80 m in diameter)
m) A fixed amount (500ml) on the exposed circular sound absorbing material part
Was discharged from the sprinkler 18 for one minute, and the water absorption of the sound absorbing material was measured. The contact angle was measured by a liquid method using a Kyowa contact angle meter. The smaller the water absorption (the larger the contact angle of the film with water), the better the waterproofness.
【００２９】・通気性の測定方法 吸音材のフィルム表面から１０ｍｍ厚さ部分の通気性を
ＪＩＳ Ｌ １０９６Ａ法に従って測定した。Method of measuring air permeability The air permeability of a portion of the sound absorbing material having a thickness of 10 mm from the film surface was measured according to JIS L 1096A.
【００３０】・難燃性の測定方法 試験片に炎を６０秒あてた後に、炎を取り除いて、その
後の挙動を観察する方法。各種規格の差で詳細条件は異
なるが炎を取り除いた後がポイントとなる。この方法に
おける自消性とは炎を取り除くと消える性質を示す。Method of measuring flame retardancy A method in which a flame is applied to a test piece for 60 seconds, the flame is removed, and the subsequent behavior is observed. Although the detailed conditions are different due to the difference of various standards, the point is after removing the flame. The self-extinguishing property in this method indicates a property that disappears when the flame is removed.
【００３１】・吸音性の測定方法 周波数２００〜５０００Ｈｚにて、残響室法吸音率で測
定した。残響室法吸音率αは次式によって計算される。 α＝（４ｌｏｇe １０6 ／ｃ）×Ｖ／Ｓ×（１／Ｔ1 −
１／Ｔ0 ） （式中、ｃ：音速、Ｖ：残響室容積＝９ｍ3 、Ｓ：試料
面積＝１．２ｍ2 、Ｔ0：空室残響時間、Ｔ1 ：残響時
間） 吸音性の測定方法には音響管を使う垂直入射法吸音率測
定による方法と残響室で行う残響室法吸音率測定による
方法がある。被膜付き吸音材は、共振現象によって吸音
性能を発現するので、垂直入射法吸音率測定では正確性
を欠くので、残響室法吸音率測定法を用いた。Method of measuring sound absorption The sound absorption was measured by a reverberation room method at a frequency of 200 to 5000 Hz. The reverberation chamber method sound absorption coefficient α is calculated by the following equation. α = (4 log e 10 6 / c) × V / S × (1 / T 1 −
1 / T 0 ) (where c: sound velocity, V: reverberation chamber volume = 9 m 3 , S: sample area = 1.2 m 2 , T 0 : empty room reverberation time, T 1 : reverberation time) There are two methods: normal incidence sound absorption measurement using a sound tube, and reverberation room sound absorption measurement in a reverberation room. Since the sound-absorbing material with a coating exhibits sound absorbing performance due to the resonance phenomenon, the sound absorption coefficient measurement in the normal incidence method lacks accuracy, so the reverberation chamber method sound absorption coefficient measurement method was used.
【００３２】・耐引裂性の測定方法 製品のフィルム面から１０ｍｍ厚にスライスしたサンプ
ルを用いて、ＪＩＳＫ ６３０１に準拠して測定した。 〔実施例１〕１２５℃に加熱された上、下の熱盤を備え
たプレス成型装置の下の熱盤上に、密度２３ｋｇ／
ｍ3 、硬さ１０ｋｇｆ、厚さ２５ｍｍ、通気性１３０ｍ
ｌ／ｃｍ 2 ・秒の難燃性軟質ウレタンフォーム（ＶＨ
Ｚ、商品名、ブリヂストン社製）を置き、その上に厚さ
３０μｍ、接触角６６度のポリエステルフィルム（Ｄ２
８１０、商品名、ダイセル社製）を積層し、さらに離型
紙（ＳＢＫ７０Ｊ、商品名、リンテック社製）を配置
し、これを上の熱盤により１２５℃、９０秒、圧縮歪２
０％で加圧、加熱し、熱盤を加熱したまま、この離型紙
付き吸音材を加熱熱盤から取り出し、室温にて放冷後、
離型紙を剥ぎとり、吸音材を得た。熱盤を冷却すること
なく、続けて、上の操作を繰り返し、次の吸音材を得
た。この吸音材の諸特性（通気性、吸水量、難燃性、吸
音率）を測定し、その結果を表１に示した。 〔実施例２〕ポリエステルフィルムの代りに、厚さ３０
μｍ、接触角６２度のポリエチレンフィルム（ＰＥ３
０、商品名、日東紡績社製）を用いた以外、実施例１と
同様にして、吸音材を得た。この吸音材の諸特性を測定
し、その結果を表１に示した。 〔比較例１〕離型紙を用いない以外、実施例１と同様に
して、吸音材を得ようとしたが、溶融ポリエステルフィ
ルムが熱盤に付着し、加熱熱盤から吸音材を離脱するこ
とができなかった。 〔実施例３〕熱盤温度を１２０、１２２、１２７、１２
９℃と変量し、加熱された上、下の熱盤を備えたプレス
成型装置の下の熱盤上に、厚み２５ｍｍの難燃性軟質ウ
レタンフォーム（ＶＨＺ）、５０μｍ厚さのポリエステ
ルフィルム（Ｄ２８１０）を用いた以外、実施例１と同
様にして、それぞれ通気性が９．５、１３．８、２４．
２、４２．６ｍｌ／ｃｍ2 ・秒の吸音材を得た。この吸
音材の吸音性を広い周波数領域にて測定し、その結果を
図３に示した。 〔比較例２〕熱盤温度を１１０、１１５℃と変量した難
燃性軟質ウレタンフォーム（ＶＨＺ）を用いた以外、実
施例４と同様にして、それぞれ通気性が０．９、３．０
ｍｌ／ｃｍ2 ・秒の吸音材を得た。実施例３と同様にし
て、吸音材の吸音性を測定し、その結果を図３に示し
た。 〔比較例３〕フィルムを用いない難燃性軟質ウレタンフ
ォーム単体（通気性１２０ｍｌ／ｃｍ2 ・秒）を使用し
た以外、実施例３と同様にして吸音材を得た。実施例３
と同様にして、吸音材の吸音性を測定し、その結果を図
３に示した。 〔実施例４〕ポリエステルフィルムを積層後、この上に
フィルムの補強材として、ナイロントリコット１５ｄを
積層した、以外実施例１と同様にして、補強材付き難燃
性吸音材を得た。実施例４の吸音材及び実施例１の吸音
材について、耐引裂性を測定した結果、それぞれ１．３
６ｋｇｆ／ｃｍ及び０．３３ｋｇｆ／ｃｍであった。ま
た実施例４の吸音材の通気性、吸水量、難燃性、吸音率
を測定した結果、実施例１の吸音材のこれら特性と同じ
であった。Method for measuring tear resistance Samp sliced to a thickness of 10 mm from the film surface of the product
And measured according to JIS K6301 Example 1 Heated to 125 ° C. and provided with a lower heating plate
Density of 23 kg /
mThree, Hardness 10kgf, thickness 25mm, air permeability 130m
l / cm Two・ Second flame-retardant flexible urethane foam (VH
Z, brand name, manufactured by Bridgestone Corporation)
A polyester film (D2 having a contact angle of 30 μm and a contact angle of 66 degrees)
810 (trade name, manufactured by Daicel Co.)
Placing paper (SBK70J, trade name, manufactured by Lintec)
Then, the plate was heated at 125 ° C. for 90 seconds with a compression strain of 2
Pressing and heating at 0%, while the hot platen is heated, this release paper
Remove the sound-absorbing material with heating from the hot plate and let it cool at room temperature.
The release paper was peeled off to obtain a sound absorbing material. Cooling hot platen
Continue to repeat the above operation to get the next sound absorbing material.
Was. Various properties of this sound absorbing material (air permeability, water absorption, flame retardancy,
Sound rate) was measured, and the results are shown in Table 1. [Example 2] Instead of a polyester film, a thickness of 30
μm, polyethylene film with a contact angle of 62 degrees (PE3
0, trade name, manufactured by Nitto Boseki Co., Ltd.)
Similarly, a sound absorbing material was obtained. Measure various characteristics of this sound absorbing material
The results are shown in Table 1. Comparative Example 1 Same as Example 1 except that no release paper was used.
To obtain a sound absorbing material,
Rum adheres to the hot platen and separates the sound absorbing material from the heated hot platen.
And couldn't. Example 3 The hot platen temperature was set to 120, 122, 127, 12
Press with variable top and bottom platen heated to 9 ° C
A 25 mm thick flame-retardant soft plastic
Polyurethane foam (VHZ), 50μm thick polyester
Same as in Example 1 except that a film (D2810) was used.
Thus, the air permeability is 9.5, 13.8, 24.
2, 42.6 ml / cmTwo・ Second sound absorbing material was obtained. This sucking
Measure the sound absorption of the sound material in a wide frequency range.
As shown in FIG. [Comparative Example 2] Difficult to change the hot platen temperature to 110 and 115 ° C
Other than using flammable flexible urethane foam (VHZ),
As in Example 4, the air permeability was 0.9 and 3.0, respectively.
ml / cmTwo・ Second sound absorbing material was obtained. In the same manner as in Example 3.
Then, the sound absorbing properties of the sound absorbing material were measured, and the results are shown in FIG.
Was. [Comparative Example 3] Flame-retardant soft urethane foam without using a film
Ohm alone (breathable 120ml / cmTwo· Second)
A sound absorbing material was obtained in the same manner as in Example 3 except for the above. Example 3
The sound absorption of the sound absorbing material was measured in the same manner as
3 is shown. [Example 4] After laminating a polyester film,
Nylon tricot 15d as a reinforcing material for the film
Flame retardant with reinforcing material in the same manner as in Example 1 except for lamination
A sound absorbing material was obtained. Sound absorbing material of Example 4 and sound absorbing material of Example 1
As a result of measuring the tear resistance of the material, 1.3
They were 6 kgf / cm and 0.33 kgf / cm. Ma
Permeability, water absorption, flame retardancy and sound absorption of the sound absorbing material of Example 4
As a result, the same characteristics as those of the sound absorbing material of Example 1 were obtained.
Met.
【００３３】[0033]
【表１】 [Table 1]
【００３４】実施例に示されるように、本発明の吸音材
の製造方法によれば、防水性及び吸音性、さらに必要が
あれば耐引裂性に優れた吸音材が効率よく、容易に得ら
れることがわかる。As shown in the examples, according to the method for producing a sound-absorbing material of the present invention, a sound-absorbing material having excellent waterproof and sound absorbing properties and, if necessary, tear resistance can be obtained efficiently and easily. You can see that.
【００３５】比較例１からわかるように、フィルムと熱
盤の間に離型紙を用いない場合、溶融フィルムが熱盤に
付着し、加熱熱盤から吸音材を離脱することができな
い。本発明では加熱熱盤から吸音材を容易に離脱でき、
熱盤を冷却することなく、加熱のまま、次の吸音材を製
造できるので、エネルギーロスを抑えることができ、生
産性が顕著に向上する。As can be seen from Comparative Example 1, when no release paper is used between the film and the hot platen, the molten film adheres to the hot platen and the sound absorbing material cannot be separated from the hot platen. In the present invention, the sound absorbing material can be easily separated from the heating hot plate,
The next sound-absorbing material can be manufactured without cooling the hot platen and with heating, so that energy loss can be suppressed and productivity is significantly improved.
【００３６】また、この製造方法で得られる吸音材は、
防水性の向上（吸水量小）が顕著であり、このことは吸
音材に用いられるフィルムの水への接触角が大きい（撥
水性大）ことで説明できる。また、実施例４に示される
ように、必要に応じて、耐引裂性を大幅に向上させるこ
とができる。The sound absorbing material obtained by this manufacturing method is
The improvement in waterproofness (small water absorption) is remarkable, which can be explained by the fact that the contact angle of the film used for the sound absorbing material with water is large (large water repellency). Moreover, as shown in Example 4, the tear resistance can be significantly improved as required.
【００３７】図３に見られるように、本発明の吸音材に
おける通気性を請求範囲特に約１０〜２５ｍｌ／ｃｍ2
・秒内とすれば低〜中周波数域の吸音性に優れているこ
とがわかる。一方請求範囲外（５未満ｍｌ／ｃｍ2 ・
秒）（比較例２）ではこの吸音性は悪化する。フィルム
なしのウレタンフォーム単体（比較例３）では、同様
に、この吸音性は良くない。As can be seen in FIG. 3, the air permeability of the sound absorbing material of the present invention is particularly preferably in the range of about 10 to 25 ml / cm 2.
-It can be seen that within a second, the sound absorption in the low to middle frequency range is excellent. On the other hand, outside the claims (less than 5 ml / cm 2 ·
Second) (Comparative Example 2), the sound absorbing property is deteriorated. In the case of urethane foam alone without a film (Comparative Example 3), the sound absorbing property is similarly poor.
【００３８】[0038]
【発明の効果】本発明の吸音材の製造方法は、上記のよ
うな構成としたので、防水性、吸音性に優れ、必要に応
じて耐引裂性も改良された吸音材を、エネルギーロスが
小さく、短時間で、簡便に製造できるという優れた効果
を奏する。According to the method for producing a sound absorbing material of the present invention, the sound absorbing material having excellent waterproofness and sound absorbing properties and, if necessary, improved tear resistance can be produced by using the above-described structure. It has an excellent effect that it can be easily manufactured in a short time in a small size.
【図１】プレス成型装置の熱盤温度と吸音材の通気量の
関係を示す図である。FIG. 1 is a diagram showing a relationship between a hot platen temperature of a press molding apparatus and a ventilation amount of a sound absorbing material.
【図２】吸水量測定装置の概略図である。FIG. 2 is a schematic diagram of a water absorption measuring device.
【図３】各周波数における、吸音材の通気量と吸音率の
関係を示す図である。FIG. 3 is a diagram showing the relationship between the amount of ventilation of the sound absorbing material and the sound absorption coefficient at each frequency.
１０ 吸水量測定装置 １２ 支持台 １４ 吸音材 １６ 吸音材カバー １８ 散水器 DESCRIPTION OF SYMBOLS 10 Water absorption measuring device 12 Support base 14 Sound absorbing material 16 Sound absorbing material cover 18 Water sprinkler
Claims (7)
ね合わせ、その上に離型紙を積層し、離型紙側から、熱
盤にて加圧加熱して、該軟質ウレタンフォームと該フィ
ルムを溶融接着させ、加熱熱盤から積層物を取り出し、
フィルムの固化後、この積層物から、離型紙を取り除
き、フィルム表面から１０ｍｍ厚さ部分の通気性が５〜
８０ｍｌ／ｃｍ2 ・秒である吸音材を得ることを特徴と
する吸音材の製造方法。1. A film is superimposed on a flexible urethane foam, a release paper is laminated thereon, and a pressure plate is heated from a release paper side with a hot plate to melt-bond the flexible urethane foam and the film. , Take out the laminate from the heating hot plate,
After solidification of the film, the release paper was removed from the laminate, and the air permeability of the portion having a thickness of 10 mm from the film surface was 5 to 5.
A method for producing a sound absorbing material, comprising obtaining a sound absorbing material having a flow rate of 80 ml / cm 2 · second.
ウレタンフォームであることを特徴とする請求項１記載
の吸音材の製造方法。2. The method for producing a sound absorbing material according to claim 1, wherein said flexible urethane foam is a flame-retardant flexible urethane foam.
はポリエチレンフィルムであることを特徴とする請求項
１記載の吸音材の製造方法。3. The method according to claim 1, wherein the film is a polyester film or a polyethylene film.
しないポリエステルフィルム又はポリエチレンフィルム
であることを特徴とする請求項１記載の吸音材の製造方
法。4. The method according to claim 1, wherein the film is a polyester film or a polyethylene film that does not require a hot melt adhesive.
り３℃以上であることを特徴とする請求項１記載の吸音
材の製造方法。5. The method for producing a sound-absorbing material according to claim 1, wherein the temperature of the heating under pressure is 3 ° C. or higher than the melting point of the film.
を重ね合わせ、このフィルム面に、さらに通気性が５ｍ
ｌ／ｃｍ2 ・秒以上で、可撓性のある樹脂織物又は樹脂
不織布を積層してなることを特徴とする請求項１記載の
吸音材の製造方法。6. A film is superimposed on the flexible urethane foam, and the film surface has an air permeability of 5 m.
2. The method for producing a sound-absorbing material according to claim 1, wherein a flexible resin woven fabric or a resin non-woven fabric is laminated at a rate of 1 / cm 2 · sec or more.
ナイロン織物又はナイロン不織布であることを特徴とす
る請求項６記載の吸音材の製造方法。7. The method according to claim 6, wherein the resin woven fabric or the resin nonwoven fabric is a nylon woven fabric or a nylon nonwoven fabric, respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02288097A JP3388681B2 (en) | 1996-08-27 | 1997-02-05 | Manufacturing method of sound absorbing material |
| US09/014,618 US6066580A (en) | 1997-02-05 | 1998-01-28 | Fire retardant noise absorbing material and method of producing the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22560996 | 1996-08-27 | ||
| JP8-225609 | 1996-08-27 | ||
| JP02288097A JP3388681B2 (en) | 1996-08-27 | 1997-02-05 | Manufacturing method of sound absorbing material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10119220A true JPH10119220A (en) | 1998-05-12 |
| JP3388681B2 JP3388681B2 (en) | 2003-03-24 |
Family
ID=26360173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02288097A Expired - Fee Related JP3388681B2 (en) | 1996-08-27 | 1997-02-05 | Manufacturing method of sound absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3388681B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498700B2 (en) | 1998-08-24 | 2002-12-24 | Nitto Denko Corporation | Damping material, damping method and disc drive |
| JP2011167950A (en) * | 2010-02-19 | 2011-09-01 | Bridgestone Corp | Method of manufacturing polyurethane foam laminate |
| US9230533B2 (en) | 2009-06-16 | 2016-01-05 | Yukihiro Nishikawa | Sound absorbing body and manufacturing method thereof |
| JP2020134765A (en) * | 2019-02-21 | 2020-08-31 | 株式会社イノアック技術研究所 | Laminated sound absorbing material |
-
1997
- 1997-02-05 JP JP02288097A patent/JP3388681B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498700B2 (en) | 1998-08-24 | 2002-12-24 | Nitto Denko Corporation | Damping material, damping method and disc drive |
| US9230533B2 (en) | 2009-06-16 | 2016-01-05 | Yukihiro Nishikawa | Sound absorbing body and manufacturing method thereof |
| JP2011167950A (en) * | 2010-02-19 | 2011-09-01 | Bridgestone Corp | Method of manufacturing polyurethane foam laminate |
| JP2020134765A (en) * | 2019-02-21 | 2020-08-31 | 株式会社イノアック技術研究所 | Laminated sound absorbing material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3388681B2 (en) | 2003-03-24 |
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