JP5055856B2 - Production method of sound absorbing material - Google Patents

Production method of sound absorbing material Download PDF

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JP5055856B2
JP5055856B2 JP2006179601A JP2006179601A JP5055856B2 JP 5055856 B2 JP5055856 B2 JP 5055856B2 JP 2006179601 A JP2006179601 A JP 2006179601A JP 2006179601 A JP2006179601 A JP 2006179601A JP 5055856 B2 JP5055856 B2 JP 5055856B2
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sound
skin material
layer
foaming
backing layer
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JP2008006711A (en
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暁優 田中
正浩 楯列
雅彦 森
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Toyota Boshoku Corp
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Description

本発明は、吸音材の製造方法に関する。 The present invention relates to a method of manufacturing a suction sound material.

一般的に、自動車などの車内には、車室外の騒音を車室内に伝播させないために、フロアカーペットやフロアマットなどの各種防音体が備えられている。
防音体の中には、車室外の騒音を遮音するために、熱可塑性樹脂などの遮音基材を利用してフロアパネルなどから伝わる騒音を遮音する遮音材がある。こうした遮音材は、伝播する音の振動速度が概ね遮音材の質量(面密度)によって規定される。そのため、遮音材は、遮音基材の質量を増やすことによって、伝播する音の振動速度を低下させて遮音作用を向上させる。
Generally, in a vehicle such as an automobile, various soundproofing bodies such as a floor carpet and a floor mat are provided in order to prevent noise outside the vehicle interior from propagating into the vehicle interior.
Among the soundproofing bodies, there is a sound insulating material that uses a sound insulating base material such as a thermoplastic resin to insulate noise transmitted from a floor panel or the like in order to insulate noise outside the passenger compartment. In such a sound insulating material, the vibration speed of the propagating sound is generally defined by the mass (surface density) of the sound insulating material. Therefore, the sound insulating material increases the mass of the sound insulating base material, thereby reducing the vibration speed of the propagating sound and improving the sound insulating effect.

しかし、窓などを介して一旦車室内に入った音は、質量の大きい遮音基材に当ると、車内に反射される。この結果、質量の大きい遮音基材は、車室内に入った音を車室内で多重反射して車室内の静粛性を損なう問題を招く。また、質量の大きい遮音基材は、その重量の増加分だけ、車両重量の増加を招いて車両燃費を低下させる。   However, once the sound enters the vehicle compartment through a window or the like, it is reflected into the vehicle when it hits a sound insulating base material having a large mass. As a result, the sound-insulating base material having a large mass causes a problem that the sound entering the vehicle interior is subjected to multiple reflections in the vehicle interior and the quietness of the vehicle interior is impaired. In addition, the sound insulating base material having a large mass causes an increase in the vehicle weight by an amount corresponding to the increase in the weight, thereby reducing the vehicle fuel consumption.

一方、防音体の中には、騒音を吸音するために、ウレタンなどの吸音基材を利用して車室内に入る音を吸音する吸音材がある。特許文献1の吸音材(自動車用繊維マット)は、織布などの表皮材の裏面側にポリウレタンなどの発泡吸音材を有している。しかも、該発泡吸音材は、ベース樹脂材料の双極子モーメント量を増加させる添加剤を含んでいる。   On the other hand, in the soundproof body, there is a sound absorbing material that absorbs sound entering the vehicle interior using a sound absorbing base material such as urethane in order to absorb noise. The sound absorbing material (fiber mat for automobiles) of Patent Document 1 has a foam sound absorbing material such as polyurethane on the back side of a skin material such as a woven fabric. In addition, the foamed sound absorbing material contains an additive that increases the amount of dipole moment of the base resin material.

これによって、自動車用繊維マットは、発泡吸音材に当った音を発泡体内の気泡部分の空気振動に変換し、気泡表面の空気の粘性摩擦によって、音のエネルギーを熱エネルギーに変換する(吸音する)。しかも、該発泡吸音材は、音のエネルギーをベース樹脂材料の双極子の変位エネルギーに変換して吸音作用を増大する。そのため、自動車用繊維マットの軽量化と防音性の向上を図ることができる。
特開2005−289121号公報
As a result, the automobile fiber mat converts the sound hitting the foamed sound absorbing material into air vibrations of the air bubbles in the foam, and converts the sound energy into heat energy (absorbs sound) by viscous friction of the air on the surface of the air bubbles. ). Moreover, the foamed sound absorbing material converts sound energy into the displacement energy of the dipole of the base resin material to increase the sound absorbing action. Therefore, it is possible to reduce the weight of the automobile fiber mat and improve the soundproofing property.
JP 2005-289121 A

しかしながら、特許文献1の自動車用繊維マットは、表皮材の裏面にバッキングを有し、該バッキングの裏面に発泡吸音材が裏打ちされている。そして、このバッキングは、吸音性能を有しない熱可塑性樹脂によって形成され、しかも、その通気度に関して何ら考慮がなされていない。   However, the automobile fiber mat of Patent Document 1 has a backing on the back surface of the skin material, and the foamed sound absorbing material is lined on the back surface of the backing material. And this backing is formed with the thermoplastic resin which does not have a sound-absorbing performance, Furthermore, no consideration is made regarding the air permeability.

そのため、特許文献1の自動車用繊維マットは、フロアパネル側(裏側)からの騒音を発泡吸音材によって円滑に吸音するものの、車室内(表側)からの騒音を発泡吸音材に伝播し難くしている。この結果、特許文献1の自動車用繊維マットは、車室内(表側)からの騒音に対して、発泡吸音材の吸音作用や該発泡吸音材の裏側に配置されるフロアカーペットの吸音作用を阻害する問題を招いていた。   Therefore, although the fiber mat for automobiles of Patent Document 1 smoothly absorbs noise from the floor panel side (back side) by the foamed sound absorbing material, it makes it difficult to transmit noise from the vehicle interior (front side) to the foamed sound absorbing material. Yes. As a result, the fiber mat for automobiles of Patent Document 1 inhibits the sound absorbing action of the foamed sound absorbing material and the sound absorbing action of the floor carpet disposed on the back side of the foamed sound absorbing material with respect to noise from the vehicle interior (front side). Had a problem.

本発明の目的は、上記問題を解決するためになされたものであり、軽量化を図るとともに、吸音性を向上させた吸音材の製造方法を提供することである。 An object of the present invention has been made to solve the above problems, while achieving weight reduction, it is to provide a manufacturing method of the intake sound material with improved sound absorption.

この吸音材によれば、表皮材に当った音が、低発泡倍率層によって、より確実に発泡層の内方に伝播する。そして、発泡層の内方に伝播した音が、高発泡倍率層によって、より確実に減衰する。   According to this sound absorbing material, the sound hitting the skin material is more reliably transmitted to the inside of the foamed layer by the low foaming magnification layer. And the sound propagated inward of the foam layer is more reliably attenuated by the high foam ratio layer.

本発明の吸音材の製造方法は、表皮材の裏面に発泡樹脂材料を塗布する塗布工程と、前記発泡樹脂材料を塗布した状態で、前記表皮材の表面側を所定温度で加熱し、前記表皮材の裏面側を前記所定温度より高い温度で加熱して前記表皮材の裏面に接着する発泡層を形成するとともに、前記表皮材から前記発泡層に向う方向に前記発泡層の発泡倍率を高くする発泡工程と、を備え、前記発泡工程は、前記表皮材側を所定温度で加熱するとともに、同時に、前記表皮材の裏面側を前記所定温度よりも高い温度で加熱するThe method for producing a sound-absorbing material of the present invention includes a coating step of coating a foamed resin material on the back surface of a skin material, and heating the surface side of the skin material at a predetermined temperature while the foamed resin material is coated. Heating the back side of the material at a temperature higher than the predetermined temperature to form a foam layer that adheres to the back side of the skin material, and increasing the foaming ratio of the foam layer in the direction from the skin material toward the foam layer A foaming step , wherein the foaming step heats the skin material side at a predetermined temperature and simultaneously heats the back surface side of the skin material at a temperature higher than the predetermined temperature .

本発明の吸音材の製造方法によれば、表皮材に接着した発泡層を形成する際に、表皮材から発泡層に向う方向に当該発泡層の発泡倍率を容易に高くすることができる。そのため、表皮材に当った音が、低い発泡倍率、つまり密度の高い(通気量の少ない)発泡層の内方にまで伝播して閉じ込められる。そして、発泡層の内方に伝播して、再度車室側への放出が抑制された音は、高い発泡倍率、つまり密度の低い発泡層の内方で減衰する。したがって、吸音性を向上させた吸音材を製造することができる。   According to the method for producing a sound-absorbing material of the present invention, when forming a foam layer bonded to a skin material, the foaming ratio of the foam layer can be easily increased in the direction from the skin material to the foam layer. Therefore, the sound hitting the skin material is propagated and confined to the inside of the foam layer having a low foaming ratio, that is, a high density (low air flow rate). And the sound which propagated inward of the foaming layer and was again suppressed to the passenger compartment side attenuates at a high foaming ratio, that is, the inside of the foaming layer having a low density. Therefore, a sound absorbing material with improved sound absorbing properties can be manufactured.

本発明の吸音材の製造方法は、表皮材と基材のいずれか一方に発泡樹脂材料を塗布する塗布工程と、前記発泡樹脂材料を介して前記表皮材と前記基材とを貼り合わせる貼合工程と、前記表皮材と前記基材を貼り合せた状態で、前記表皮材側と前記基材側をそれぞれ所定温度と前記所定温度よりも高い温度で加熱して前記表皮材と前記基材に接着する発泡層を形成し、前記発泡層の発泡倍率を前記表皮材側から前記基材側に向かって高くする発泡工程と、を備え、前記発泡工程は、前記表皮材側を所定温度で加熱するとともに、同時に、前記基材側を前記所定温度よりも高い温度で加熱するThe method for producing a sound-absorbing material of the present invention includes a coating step in which a foamed resin material is applied to one of a skin material and a substrate, and a bonding process in which the skin material and the substrate are bonded via the foamed resin material. In a state where the skin material and the base material are bonded to each other, the skin material side and the base material side are heated at a predetermined temperature and a temperature higher than the predetermined temperature, respectively, to the skin material and the base material. A foaming step of forming a foaming layer to be bonded and increasing a foaming ratio of the foaming layer from the skin material side toward the base material side , wherein the foaming step heats the skin material side at a predetermined temperature. At the same time, the base material side is heated at a temperature higher than the predetermined temperature .

本発明の吸音材の製造方法によれば、表皮材と基材を接着する発泡層を形成する際に、表皮材から基材に向う方向に当該発泡層の発泡倍率を容易に高くすることができる。そのため、表皮材に当った音が、低い発泡倍率、つまり密度の高い(通気量の少ない)発泡層の内方にまで伝播して閉じ込められる。そして、発泡層の内方に伝播して、再度車室側への放出が抑制された音は、高い発泡倍率、つまり密度の低い発泡層の内方で減衰する。したがって、吸音性を向上させた吸音材を製造することができる。   According to the method for producing a sound absorbing material of the present invention, when forming a foam layer that adheres the skin material and the substrate, the foaming ratio of the foam layer can be easily increased in the direction from the skin material to the substrate. it can. Therefore, the sound hitting the skin material is propagated and confined to the inside of the foam layer having a low foaming ratio, that is, a high density (low air flow rate). And the sound which propagated inward of the foaming layer and was again suppressed to the passenger compartment side attenuates at a high foaming ratio, that is, the inside of the foaming layer having a low density. Therefore, a sound absorbing material with improved sound absorbing properties can be manufactured.

この吸音材の製造方法によれば、一度の加熱・発泡によって、表皮材側から基材側に向かって発泡倍率の高くなる発泡層を形成することができる。したがって、吸音材の生産性を向上させることができる。   According to this method for producing a sound-absorbing material, it is possible to form a foamed layer having a foaming ratio that increases from the skin material side toward the base material side by one heating and foaming. Therefore, the productivity of the sound absorbing material can be improved.

以下、本発明に係る吸音材としての車両用フロアマット1を図1〜図5に従って説明する。図1は、車両用フロアマット1を示す概略断面図である。図2は、車両用フロアマット1の要部を走査型電子顕微鏡(SEM)で撮像した一例である。   Hereinafter, a vehicle floor mat 1 as a sound absorbing material according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view showing a vehicle floor mat 1. FIG. 2 is an example in which the main part of the vehicle floor mat 1 is imaged with a scanning electron microscope (SEM).

図1において、車両用フロアマット1には、基材2が備えられている。基材2は、車両用フロアマット1の裏側(図1の下側)に当たる音を吸音する公知の吸音材であって、例えば、通気性を有した不織布や発泡体などを用いることができる。   In FIG. 1, a vehicle floor mat 1 is provided with a base material 2. The base material 2 is a known sound-absorbing material that absorbs sound hitting the back side (the lower side in FIG. 1) of the vehicle floor mat 1, and for example, a non-woven fabric or foam having air permeability can be used.

基材2の表側(図1の上側)には、発泡層としてのバッキング層3が形成されている。バッキング層3は、基材2の表面に加熱接着可能な発泡樹脂材料によって形成されている。バッキング層3は、基材2の表面(図1の上面)と接着する連続気泡構造を有し、空気に対する浸透性を有する。なお、バッキング層3には、連続気泡構造の中に独立気泡を含んでもよい。バッキング層3に含まれる連続気泡は、バッキング層3の吸音作用を向上させる。一方、バッキング層3に含まれる独立気泡は、バッキング層3の遮音作用を向上させる。   A backing layer 3 as a foam layer is formed on the front side of the substrate 2 (upper side in FIG. 1). The backing layer 3 is formed of a foamed resin material that can be heat-bonded to the surface of the substrate 2. The backing layer 3 has an open cell structure that adheres to the surface of the substrate 2 (upper surface in FIG. 1), and is permeable to air. The backing layer 3 may contain closed cells in the open cell structure. The open cells contained in the backing layer 3 improve the sound absorbing effect of the backing layer 3. On the other hand, the closed cells included in the backing layer 3 improve the sound insulation effect of the backing layer 3.

バッキング層3は、その表側から裏側に向かう方向(図1の下向)に沿って発泡倍率を高くする。詳述すると、図2に示すように、バッキング層3は、裏側に近づくに連れて、連続気泡の数量を多くするとともに、そのサイズを縮小して、連続気泡を構成する壁の厚さを薄くする。反対に、バッキング層3は、表側に近づくに連れて、連続気泡の数量を少なくするとともに、そのサイズを拡大して、連続気泡を構成する壁の厚さを厚くする。すなわち、バッキング層3は、表側から裏側に向かう方向に沿って密度を低くして、通気量を多くする。   The backing layer 3 increases the expansion ratio along the direction from the front side to the back side (downward in FIG. 1). Specifically, as shown in FIG. 2, as the backing layer 3 approaches the back side, the number of open cells is increased and the size thereof is reduced to reduce the thickness of the walls constituting the open cells. To do. On the other hand, as the backing layer 3 approaches the front side, the number of open cells is reduced and the size thereof is increased to increase the thickness of the walls constituting the open cells. That is, the backing layer 3 decreases the density along the direction from the front side to the back side to increase the air flow rate.

そして、バッキング層3の表面に当った音は、表側の連続気泡を介して、バッキング層3の内方に減衰しながら伝播する。バッキング層3の内方に一旦伝播した音は、表側の通気量が少ない分だけ、バッキング層3の内方に閉じ込められ易くなる。バッキング層3の
内方に閉じ込められて、再度車室側への放出が抑制された音は、裏側の発泡倍率が高くなる分だけ、複数の連続気泡に分散して、より効果的に減衰する。
Then, the sound hitting the surface of the backing layer 3 propagates while being attenuated inward of the backing layer 3 through the open-side bubbles on the front side. The sound that has once propagated to the inside of the backing layer 3 is easily confined inside the backing layer 3 by the amount of airflow on the front side being small. The sound that is confined inside the backing layer 3 and is prevented from being released to the passenger compartment side again is dispersed into a plurality of open cells and is more effectively attenuated by the increase in the foaming ratio on the back side. .

バッキング層3は、その発泡倍率が過度に低くなると、通気量が少なくなり過ぎて、音の伝播性を損なう。また、連続気泡の数量が少なくなりすぎて、伝播した音の分散性を損なう。一方、バッキング層3は、その発泡倍率が過度に高くなると、通気量が多くなり過ぎて、バッキング層3の内方に伝播した音を閉じ込められなくなる。そのため、車両騒音を低減させる場合には、バッキング層3の発泡倍率を1.5〜10倍にするのが好ましい。   If the foaming ratio of the backing layer 3 becomes excessively low, the air flow rate becomes too small and the sound propagation property is impaired. In addition, the number of open cells becomes too small, and the dispersibility of the propagated sound is impaired. On the other hand, if the foaming ratio of the backing layer 3 becomes excessively high, the amount of air flow increases so that the sound propagated inward of the backing layer 3 cannot be confined. Therefore, when reducing vehicle noise, it is preferable that the foaming ratio of the backing layer 3 is 1.5 to 10 times.

このバッキング層3は、単層構造に限らず、複数層の積層構造であってもよい。例えば、図2に示すように、基材2の表面に接着して発泡倍率が3.5倍〜8.0倍の高発泡倍率層3Hと、該高発泡倍率層3Hの上層であって発泡倍率が1.5倍〜4.0倍の低発泡倍率層3Lとからなる2層構成であってもよい。   The backing layer 3 is not limited to a single layer structure, and may be a multilayer structure having a plurality of layers. For example, as shown in FIG. 2, it is bonded to the surface of the base material 2 and has a high expansion ratio layer 3H having an expansion ratio of 3.5 to 8.0 and an upper layer of the high expansion ratio layer 3H. A two-layer configuration including a low expansion ratio layer 3L having a magnification of 1.5 to 4.0 times may be used.

バッキング層3は、その通気度が過度に低くなると、バッキング層3の表面に当った音を反射するようになる。一方、バッキング層3は、その通気量が過度に多くなると、バッキング層3の表面に当った音を殆ど減衰させることなく透過させるようになる。そのため、車両騒音を低減させる場合には、バッキング層3の通気度を5cc/cm/秒〜20cc/cm/秒にするのが好ましい。なお、バッキング層3の通気度は、バッキング層3にフィラー(炭酸カルシウム、水酸化カルシウム、シリカ等の無機充填剤など)を添加し、界面活性剤を配合調整することによって制御することができる。 When the air permeability of the backing layer 3 becomes excessively low, the sound hitting the surface of the backing layer 3 is reflected. On the other hand, when the amount of air flow becomes excessively large, the backing layer 3 transmits the sound hitting the surface of the backing layer 3 with almost no attenuation. Therefore, when reducing the vehicle noise, preferably the air permeability of the backing layer 3 to 5 cc / cm 2 / sec ~20cc / cm 2 / sec. The air permeability of the backing layer 3 can be controlled by adding a filler (such as an inorganic filler such as calcium carbonate, calcium hydroxide, or silica) to the backing layer 3 and adjusting the formulation of the surfactant.

バッキング層3の発泡樹脂材料には、公知の熱硬化性あるいは熱可塑性の樹脂材料であって、物理的に撹拌して強制発泡(起泡)させた樹脂材料、あるいは発泡剤を含有する樹脂材料を用いることができる。樹脂材料には、例えば、ポリエチレンやポリプロピレンなどのオレフィン系、汎用ポリスチレンやABS樹脂などのスチレン系、アクリル樹脂、ポリウレタンなどを用いることができる。発泡剤には、化学発泡剤又は物理発泡剤を用いることができる。化学発泡剤としては、例えば分解されて窒素ガスを発生する熱分解型発泡剤や、分解されて炭酸ガスを発生する熱分解型無機発泡剤などがあげられる。物理発泡剤としては、水、炭酸ガスなどがあげられる。上記撹拌の条件や上記発泡剤の種別は、バッキング層3の発泡倍率と発泡樹脂材料の加熱・発泡条件に基づいて、適宜選択されるものである。   The foamed resin material of the backing layer 3 is a known thermosetting or thermoplastic resin material, which is a resin material that is physically agitated and forcedly foamed (foamed), or a resin material containing a foaming agent Can be used. Examples of the resin material that can be used include olefins such as polyethylene and polypropylene, styrenes such as general-purpose polystyrene and ABS resin, acrylic resins, and polyurethane. As the foaming agent, a chemical foaming agent or a physical foaming agent can be used. Examples of the chemical foaming agent include a thermal decomposition type foaming agent that decomposes to generate nitrogen gas, and a thermal decomposition type inorganic foaming agent that decomposes to generate carbon dioxide gas. Examples of the physical foaming agent include water and carbon dioxide gas. The stirring conditions and the type of the foaming agent are appropriately selected based on the foaming ratio of the backing layer 3 and the heating / foaming conditions of the foamed resin material.

図1において、バッキング層3の表側(図2における上側)には、該バッキング層3によって接着された表皮材4が備えられている。表皮材4は、基布4aにパイル繊維4bを織込んだカーペットであるが、これに限らず、例えば不織布であってもよい。表皮材4は、バッキング層3の吸音作用を利用するために通気性を有するものであって、バッキング層3と加熱接着可能なものであればよい。   In FIG. 1, a skin material 4 bonded by the backing layer 3 is provided on the front side of the backing layer 3 (upper side in FIG. 2). The skin material 4 is a carpet in which pile fibers 4b are woven into a base fabric 4a, but is not limited thereto, and may be a nonwoven fabric, for example. The skin material 4 has a breathability in order to use the sound absorbing action of the backing layer 3 and may be any material that can be heat bonded to the backing layer 3.

次に、上記のように構成される車両用フロアマット1の製造方法について、図3に従って説明する。図3は、車両用フロアマットの製造システム10を説明する説明図である。
図3において、車両用フロアマットの製造システム10には、表皮材供給ローラ11と支持台12が備えられている。表皮材供給ローラ11は、巻き付けられた表皮材4を表裏反転状態(表皮材4の裏面を図3の上側)にして支持台12に送給する。
Next, a method for manufacturing the vehicle floor mat 1 configured as described above will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining the vehicle floor mat manufacturing system 10.
In FIG. 3, the vehicle floor mat manufacturing system 10 includes a skin material supply roller 11 and a support 12. The skin material supply roller 11 feeds the wound skin material 4 to the support 12 in a reversed state (the back surface of the skin material 4 is the upper side in FIG. 3).

支持台12の上側には、発泡樹脂供給装置13、塗布ローラ14、基材供給ローラ15及び押圧ローラ16が設けられている。
発泡樹脂供給装置13は、支持台12に送給された表皮材4の裏面(図3の上面)に発泡樹脂を供給する。塗布ローラ14は、表皮材4の裏面に供給された発泡樹脂材料を該裏
面の全体に塗り広げる。そして、これら発泡樹脂供給装置13と塗布ローラ14によって、表皮材4の裏面全体に発泡樹脂材料を均一に塗布する(塗布工程を行う)。
Above the support 12, a foamed resin supply device 13, a coating roller 14, a base material supply roller 15, and a pressure roller 16 are provided.
The foamed resin supply device 13 supplies the foamed resin to the back surface (upper surface in FIG. 3) of the skin material 4 fed to the support base 12. The application roller 14 spreads the foamed resin material supplied to the back surface of the skin material 4 over the entire back surface. Then, the foamed resin material is uniformly applied to the entire back surface of the skin material 4 by the foamed resin supply device 13 and the application roller 14 (application process is performed).

基材供給ローラ15は、巻き付けられた基材2を表裏反転状態(基材2の表面を図3の下側)にして支持台12に送給する。押圧ローラ16は、送給された基材2の表面(図3の下面)を表皮材4の発泡樹脂に押圧する。そして、これら基材供給ローラ15と押圧ローラ16によって、基材2と表皮材4を発泡樹脂材料で貼り合わせる(貼合工程を行う)。   The base material supply roller 15 feeds the wound base material 2 to the support base 12 with the front and back being reversed (the surface of the base material 2 is the lower side in FIG. 3). The pressing roller 16 presses the surface (the lower surface in FIG. 3) of the fed base material 2 against the foamed resin of the skin material 4. Then, the base material 2 and the skin material 4 are bonded with a foamed resin material by the base material supply roller 15 and the pressing roller 16 (a bonding process is performed).

車両用フロアマットの製造システム10には、乾燥炉17が備えられている。乾燥炉17には、発泡樹脂材料を介して貼り合わされた状態の表皮材4と基材2が送給される。乾燥炉17には、高温加熱装置17Hと低温加熱装置17Lが備えられている。高温加熱装置17Hは、送給される基材2と相対向するように配設されている。低温加熱装置17Lは、送給される表皮材4と相対向するように配設されている。これら高温加熱装置17Hと低温加熱装置17Lは、それぞれ相対向する基材2と表皮材4に高温の熱風と低温の熱風を送風する。   The vehicle floor mat manufacturing system 10 includes a drying furnace 17. The drying furnace 17 is fed with the skin material 4 and the base material 2 in a state of being bonded together with a foamed resin material. The drying furnace 17 is provided with a high temperature heating device 17H and a low temperature heating device 17L. The high temperature heating device 17H is disposed so as to face the substrate 2 to be fed. The low-temperature heating device 17L is disposed so as to face the skin material 4 to be fed. The high temperature heating device 17H and the low temperature heating device 17L blow high temperature hot air and low temperature hot air to the base material 2 and the skin material 4 which face each other.

そして、低温加熱装置17Lは、表皮材4側の発泡樹脂材料を所定温度(例えば、100℃〜140℃の低温)で加熱(乾燥)し、バッキング層3の一部を低発泡倍率で形成して表皮材4とバッキング層3を接着する。また、高温加熱装置17Hは、基材2側の発泡樹脂材料を上記所定温度よりも高い温度(例えば140℃〜200℃の高温)で加熱(乾燥)し、バッキング層3の一部を高発泡倍率で形成して基材2とバッキング層3を接着する(発泡工程を行う)。   The low-temperature heating device 17L heats (drys) the foamed resin material on the skin material 4 side at a predetermined temperature (for example, a low temperature of 100 ° C. to 140 ° C.) to form a part of the backing layer 3 at a low foaming ratio. Then, the skin material 4 and the backing layer 3 are bonded. The high-temperature heating device 17H heats (drys) the foamed resin material on the substrate 2 side at a temperature higher than the predetermined temperature (for example, a high temperature of 140 ° C. to 200 ° C.), and highly foams part of the backing layer 3. The base material 2 and the backing layer 3 are bonded at a magnification (performing a foaming process).

これによって、基材2と表皮材4をバッキング層3によって接着させるとともに、当該バッキング層3の発泡倍率を、表皮材4から基材2に向う方向に沿って増加させる。
なお、乾燥炉17では、高温加熱装置17Hの高温加熱と低温加熱装置17Lの低温加熱を同時に行う構成にしているが、これに限らず、高温加熱と低温加熱を異なるタイミングで行う構成にしてもよい。これによれば、高温加熱による乾燥時間や低温加熱による乾燥時間の自由度を拡張させることができ、発泡倍率の自由度を拡張させることができる。(実施例1)
次に、実施例及び比較例をあげて本発明の吸音材の効果を説明する。
As a result, the base material 2 and the skin material 4 are adhered by the backing layer 3, and the foaming ratio of the backing layer 3 is increased along the direction from the skin material 4 toward the base material 2.
The drying furnace 17 is configured to simultaneously perform the high temperature heating of the high temperature heating device 17H and the low temperature heating of the low temperature heating device 17L, but is not limited thereto, and may be configured to perform the high temperature heating and the low temperature heating at different timings. Good. According to this, the freedom degree of the drying time by high temperature heating and the drying time by low temperature heating can be expanded, and the freedom degree of foaming magnification can be expanded. Example 1
Next, the effects of the sound absorbing material of the present invention will be described with reference to examples and comparative examples.

まず、バッキング層3のみの垂直入射吸音率を表1及び図4にしたがって説明する。表1は、実施例1及び比較例1〜3の発泡倍率、厚さ及び目付を示す。図4は、実施例1及び比較例1〜3の垂直入射吸音率を示す。   First, the normal incident sound absorption coefficient of only the backing layer 3 will be described with reference to Table 1 and FIG. Table 1 shows the expansion ratio, thickness, and basis weight of Example 1 and Comparative Examples 1 to 3. FIG. 4 shows the normal incidence sound absorption coefficient of Example 1 and Comparative Examples 1-3.

発泡樹脂材料に起泡したアクリル樹脂を用い、フィラーに炭酸カルシウムを用い、低温側の加熱温度が110℃、高温側の加熱温度が140℃の条件の下で実施例1を得た。
表1に示すように、実施例1は、発泡倍率が3倍、厚さが5t(t:任意の単位)の低発泡倍率層3Lと、発泡倍率が6倍、厚さが5tの高発泡倍率層3Hを有する。この実施例1の総目付は、830g/mである。そして、低発泡倍率層3Lを音源側に配置し、音響管法(管内法)を用いて実施例1の垂直入射吸音率を計測した(図4の実線参照)。この際、垂直入射吸音率は、1/3オクターブバンド中心周波数が100〜4000Hzとなる波数領域で計測した。
(比較例1)
発泡樹脂材料に起泡したアクリル樹脂を用い、フィラーに炭酸カルシウムを用い、低温側の加熱温度が110℃、高温側の加熱温度が140℃の条件の下で、実施例1と同じく、比較例1を得た。
Example 1 was obtained using a foamed acrylic resin as the foamed resin material, calcium carbonate as the filler, and a low temperature heating temperature of 110 ° C. and a high temperature heating temperature of 140 ° C.
As shown in Table 1, Example 1 has a low foaming ratio layer 3L with a foaming ratio of 3 times and a thickness of 5 t (t: arbitrary unit), and a high foaming with a foaming ratio of 6 times and a thickness of 5 t. It has a magnification layer 3H. The total basis weight of Example 1 is 830 g / m 2 . And the low foaming magnification layer 3L was arrange | positioned at the sound source side, and the normal incidence sound absorption coefficient of Example 1 was measured using the acoustic tube method (in-tube method) (refer the continuous line of FIG. 4). At this time, the normal incident sound absorption coefficient was measured in the wave number region where the 1/3 octave band center frequency was 100 to 4000 Hz.
(Comparative Example 1)
Comparative Example as in Example 1, using foamed acrylic resin as foamed resin material, calcium carbonate as filler, under conditions of low temperature heating temperature of 110 ° C. and high temperature heating temperature of 140 ° C. 1 was obtained.

表1に示すように、比較例1は、実施例1と同じく、発泡倍率が3倍、厚さが5tの低発泡倍率層3Lと、発泡倍率が6倍、厚さが5tの高発泡倍率層3Hを有する。この比較例1の総目付は、実施例1と同じく、830g/mである。そして、高発泡倍率層3Hを音源側に配置し、実施例1と同じく、音響管法(管内法)を用いて比較例1の垂直入射吸音率を計測した(図4の一点鎖線参照)。
(比較例2)
発泡樹脂材料に起泡したアクリル樹脂を用い、フィラーに炭酸カルシウムを用い、加熱・発泡温度が110℃の条件の下で比較例2を得た。
As shown in Table 1, Comparative Example 1, like Example 1, has a low expansion ratio layer 3L with a foaming ratio of 3 times and a thickness of 5 t, and a high expansion ratio with a foaming ratio of 6 times and a thickness of 5 t. It has layer 3H. The total basis weight of Comparative Example 1 is 830 g / m 2 as in Example 1. Then, the high expansion ratio layer 3H was arranged on the sound source side, and the normal incident sound absorption coefficient of Comparative Example 1 was measured using the acoustic tube method (in-tube method) as in Example 1 (see the one-dot chain line in FIG. 4).
(Comparative Example 2)
Comparative Example 2 was obtained under the condition of using foamed acrylic resin as foamed resin material, calcium carbonate as filler, and heating and foaming temperature of 110 ° C.

表1に示すように、比較例2は、その厚み方向全幅で発泡倍率が3倍である。比較例2は、その厚さが10t、総目付が1100g/mである。そして、実施例1と同じく、音響管法(管内法)を用いて比較例2の垂直入射吸音率を計測した(図4の破線参照)。(比較例3)
発泡樹脂材料に起泡したアクリル樹脂を用い、フィラーに炭酸カルシウムを用い、加熱・発泡温度が140℃の条件の下で比較例3を得た。
As shown in Table 1, Comparative Example 2 has a foaming ratio of 3 times in the full width in the thickness direction. Comparative Example 2 has a thickness of 10 t and a total basis weight of 1100 g / m 2 . And the normal incidence sound absorption coefficient of the comparative example 2 was measured using the acoustic tube method (in-tube method) like Example 1 (refer the broken line of FIG. 4). (Comparative Example 3)
Comparative Example 3 was obtained under the conditions of using foamed acrylic resin as foamed resin material, calcium carbonate as filler, and heating and foaming temperature of 140 ° C.

表1に示すように、比較例3は、その厚み方向全幅で発泡倍率が6倍である。比較例3は、その厚さが10t、総目付が560g/mである。そして、実施例1と同じく、音響管法(管内法)を用いて比較例3の垂直入射吸音率を計測した(図4の2点鎖線参照)。 As shown in Table 1, Comparative Example 3 has a foaming ratio of 6 times over the entire width in the thickness direction. Comparative Example 3 has a thickness of 10 t and a total basis weight of 560 g / m 2 . Then, as in Example 1, the normal incident sound absorption coefficient of Comparative Example 3 was measured using the acoustic tube method (in-tube method) (see the two-dot chain line in FIG. 4).

Figure 0005055856
図4の結果から、実施例1は、計測周波数領域の略全範囲において、比較例1〜3よりも高い垂直入射吸音率を有することが分かる。そのため、バッキング層3は、音源から遠ざかる方向に向かって発泡倍率を増加させることにより、吸音性の向上を図ることができる。
Figure 0005055856
From the result of FIG. 4, it can be seen that Example 1 has a higher normal incident sound absorption rate than Comparative Examples 1 to 3 in substantially the entire measurement frequency region. Therefore, the backing layer 3 can improve sound absorption by increasing the expansion ratio in the direction away from the sound source.

また、実施例1は、図4に示すように、比較例2に比べて、その垂直入射吸音率の向上が少ないものの、表1に示すように、発泡倍率を増加させた分だけ、総目付を少なくさせることができる。そのため、バッキング層3の軽量化を図ることができる。   In addition, as shown in FIG. 4, Example 1 has a small increase in the normal incident sound absorption coefficient as compared with Comparative Example 2, but as shown in Table 1, the total basis weight is increased by the amount by which the expansion ratio is increased. Can be reduced. Therefore, the weight of the backing layer 3 can be reduced.

また、発泡倍率を制御することによって、吸音率の周波数依存性を制御させることができる。そのため、車両用フロアマット1の設計変更に応じたバッキング層3を適宜選択させることができる。   Moreover, the frequency dependence of the sound absorption coefficient can be controlled by controlling the expansion ratio. Therefore, the backing layer 3 according to the design change of the vehicle floor mat 1 can be appropriately selected.

次いで、バッキング層3を有した車両用フロアマット1の残響室法吸音率を表2及び図5にしたがって説明する。表2は、実施例2、比較例4及び比較例5の目付を示す。図5は、実施例2、比較例4及び比較例5の残響室法吸音率を示す。
(実施例2)
表2に示すように、表皮材4に、目付が800g/mのポリプロピレンタフテッドカ
ーペットを用い、基材2に、目付が300g/mのポリエステルニードルパンチ不織布を用いた。また、発泡樹脂材料に起泡したアクリル樹脂を用い、フィラーに炭酸カルシウムを用い、低温側の加熱温度が110℃、高温側の加熱温度が140℃の条件の下でバッキング層3を形成し、実施例2を得た。
Next, the reverberation room method sound absorption coefficient of the vehicle floor mat 1 having the backing layer 3 will be described with reference to Table 2 and FIG. Table 2 shows the basis weight of Example 2, Comparative Example 4 and Comparative Example 5. FIG. 5 shows the reverberation chamber method sound absorption rate of Example 2, Comparative Example 4 and Comparative Example 5.
(Example 2)
As shown in Table 2, a polypropylene tufted carpet having a basis weight of 800 g / m 2 was used for the skin material 4, and a polyester needle punched nonwoven fabric having a basis weight of 300 g / m 2 was used for the base material 2. Further, using a foamed acrylic resin as foamed resin material, using calcium carbonate as a filler, forming a backing layer 3 under conditions where the heating temperature on the low temperature side is 110 ° C. and the heating temperature on the high temperature side is 140 ° C., Example 2 was obtained.

実施例2は、表皮材4と接着して発泡倍率が3倍の低発泡倍率層3Lと、基材2と接着して発泡倍率が6倍の高発泡倍率層3Hを有する。実施例2のバッキング層3は、その目付が500g/mである。そして、残響室法を用いて実施例2の残響室法吸音率を計測した。この際、垂直入射吸音率は、1/3オクターブバンド中心周波数が100〜6300Hzとなる波数領域で計測した(図5の実線参照)。
(比較例4)
実施例2と同じく、表皮材4に、目付が800g/mのポリプロピレンタフテッドカーペットを用い、基材2に、目付が300g/mのポリエステルニードルパンチ不織布を用いた。また、発泡樹脂材料に起泡した天然ゴムとスチレンブタジエンゴムの共重合体を用い、フィラーに炭酸カルシウムを用い、加熱温度が140℃の条件の下でバッキング層3を形成し、比較例4を得た。
Example 2 has a low foaming ratio layer 3L that is bonded to the skin material 4 and has a foaming ratio of 3 times, and a high foaming ratio layer 3H that is bonded to the substrate 2 and has a foaming ratio of 6 times. The backing layer 3 of Example 2 has a basis weight of 500 g / m 2 . And the reverberation room method sound absorption rate of Example 2 was measured using the reverberation room method. At this time, the normal incident sound absorption coefficient was measured in a wave number region where the 1/3 octave band center frequency was 100 to 6300 Hz (see the solid line in FIG. 5).
(Comparative Example 4)
As in Example 2, a polypropylene tufted carpet having a basis weight of 800 g / m 2 was used for the skin material 4, and a polyester needle punched nonwoven fabric having a basis weight of 300 g / m 2 was used for the base material 2. Further, using a foamed natural rubber and styrene butadiene rubber copolymer, using calcium carbonate as a filler, forming a backing layer 3 under a heating temperature of 140 ° C. Obtained.

比較例4のバッキング層3は、その厚み方向全幅で発泡倍率が3倍である。比較例2のバッキング層3は、その目付が600g/mである。そして、実施例2と同じく、残響室法を用いて比較例4の残響室法吸音率を計測した(図5の一点鎖線参照)。
(比較例5)
実施例2と同じく、表皮材4に、目付が800g/mのポリプロピレンタフテッドカーペットを用い、基材2に、目付が300g/mのポリエステルニードルパンチ不織布を用いた。そして、ポリエチレンパウダーを用い、加熱温度が140℃の条件の下でポリエチレン多孔質焼結体のバッキング層3を形成し、比較例5を得た。
The backing layer 3 of Comparative Example 4 has a foaming ratio of 3 times over the entire width in the thickness direction. The backing layer 3 of Comparative Example 2 has a basis weight of 600 g / m 2 . And the reverberation room method sound absorption rate of the comparative example 4 was measured using the reverberation room method similarly to Example 2 (refer the dashed-dotted line of FIG. 5).
(Comparative Example 5)
As in Example 2, a polypropylene tufted carpet having a basis weight of 800 g / m 2 was used for the skin material 4, and a polyester needle punched nonwoven fabric having a basis weight of 300 g / m 2 was used for the base material 2. And the backing layer 3 of the polyethylene porous sintered compact was formed under the conditions whose heating temperature is 140 degreeC using polyethylene powder, and the comparative example 5 was obtained.

比較例5のバッキング層3は、その目付が350g/mである。そして、実施例2と同じく、残響室法を用いて比較例5の吸音率を計測した(図5の破線参照)。 The backing layer 3 of Comparative Example 5 has a basis weight of 350 g / m 2 . And the sound absorption rate of the comparative example 5 was measured similarly to Example 2 using the reverberation chamber method (refer the broken line of FIG. 5).

Figure 0005055856
図5の結果から、実施例2は、計測周波数領域の略全範囲において、比較例4、比較例5よりも高い残響音法吸音率を有することが分かる。そのため、車両用フロアカーペットは、表皮材4から基材2に向かう方向に沿って発泡倍率を増加させることにより、吸音性の向上を図ることができる。
Figure 0005055856
From the results of FIG. 5, it can be seen that Example 2 has a higher reverberation sound absorption rate than Comparative Examples 4 and 5 in substantially the entire measurement frequency range. Therefore, the vehicle floor carpet can improve sound absorption by increasing the expansion ratio along the direction from the skin material 4 to the base material 2.

次に、上記のように構成した本実施形態の効果を以下に記載する。
(1)上記実施形態では、基材2と表皮材4の間に、基材2と表皮材4に接着して、表皮材4から基材2に向かう方向に沿って発泡倍率を高くする連続気泡構造を有したバッキ
ング層3を設けた。
Next, effects of the present embodiment configured as described above will be described below.
(1) In the above embodiment, the base material 2 and the skin material 4 are continuously bonded to the base material 2 and the skin material 4 to increase the expansion ratio along the direction from the skin material 4 to the base material 2. A backing layer 3 having a cell structure was provided.

したがって、表皮材4に当った音を、低い発泡倍率によってバッキング層3の内方にまで伝播させて閉じ込めることができる。そして、再度車室側への放出が抑制された音を、高い発泡倍率によって分散して減衰させることができる。この結果、車両用フロアマット1の軽量化を図ることができ、その吸音性を向上させることができる。   Therefore, the sound hitting the skin material 4 can be confined by propagating to the inside of the backing layer 3 with a low expansion ratio. And the sound by which the discharge | release to the compartment side was suppressed again can be disperse | distributed and attenuate | damped by high foaming magnification. As a result, the weight of the vehicle floor mat 1 can be reduced, and the sound absorption can be improved.

(2)上記実施形態では、基材2と表皮材4の間に、基材2と接着する高発泡倍率層3H(3.5倍〜8.0倍)と、表皮材4と接着する低発泡倍率層3L(1.5杯〜4.0倍)と、からなる2層構造のバッキング層3を設けた。したがって、低発泡倍率層3Lが、表皮材4に当った音を高発泡倍率層3Hまで伝播させて閉じ込める。そして、高発泡倍率層3Hが、バッキング層3の内方に閉じ込めた音を確実に減衰させる。この結果、車両用フロアマット1の吸音性を、より確実に向上させることができる。   (2) In the above embodiment, between the base material 2 and the skin material 4, a high expansion ratio layer 3H (3.5 times to 8.0 times) that adheres to the base material 2 and a low strength that adheres to the skin material 4 A backing layer 3 having a two-layer structure composed of an expansion ratio layer 3L (1.5 cups to 4.0 times) was provided. Therefore, the low expansion ratio layer 3L propagates the sound hitting the skin material 4 to the high expansion ratio layer 3H and confines it. The high expansion ratio layer 3H reliably attenuates the sound trapped inside the backing layer 3. As a result, the sound absorption of the vehicle floor mat 1 can be improved more reliably.

(3)上記実施形態では、基材2と表皮材4の間に塗布した発泡樹脂材料を、基材2側で高温加熱し、同時に、表皮材4側で低温加熱した。そして、単一の発泡樹脂材料の加熱によって、高発泡倍率層3Hと低発泡倍率層3Lを有するバッキング層3を形成した。   (3) In the said embodiment, the foamed resin material apply | coated between the base material 2 and the skin material 4 was heated at high temperature by the base material 2 side, and low temperature heating was carried out simultaneously by the skin material 4 side. Then, the backing layer 3 having the high expansion ratio layer 3H and the low expansion ratio layer 3L was formed by heating a single foamed resin material.

したがって、高発泡倍率の発泡層と低発泡倍率の発泡層を積層させる場合に比べて、車両用フロアマット1の部品点数を低減させることができ、構成を簡素にさせることができる。   Therefore, the number of parts of the vehicle floor mat 1 can be reduced and the configuration can be simplified as compared with the case where a foam layer with a high expansion ratio and a foam layer with a low expansion ratio are laminated.

また、基材2側の発泡樹脂材料と、表皮材4側の発泡樹脂材料を、それぞれ別々に加熱する場合に比べて、車両用フロアマット1の生産性を向上させることができる。
(4)しかも、基材2側の加熱温度と表皮材4側の加熱温度を変更するだけで、バッキング層3に当った音の伝播性や減衰性、さらには、吸音作用の周波数依存性を制御させることができる。したがって、車両用フロアマット1の設計変更に対して、バッキング層3の吸音性を適宜対応させることができ、車両用フロアマット1の設計範囲を拡大させることができる。
Moreover, productivity of the floor mat 1 for vehicles can be improved compared with the case where the foamed resin material by the side of the base material 2 and the foamed resin material by the side of the skin material 4 are each heated separately.
(4) In addition, only by changing the heating temperature on the base material 2 side and the heating temperature on the skin material 4 side, the propagation and attenuation of the sound hitting the backing layer 3 and further the frequency dependence of the sound absorption effect can be achieved. Can be controlled. Therefore, the sound absorption of the backing layer 3 can be appropriately adapted to the design change of the vehicle floor mat 1, and the design range of the vehicle floor mat 1 can be expanded.

(5)上記実施形態では、バッキング層3が、5cc/cm/sec〜20cc/cm/secの通気度を有する。したがって、バッキング層3は、十分に減衰できない音を裏側に伝播させることができる。この結果、バッキング層3は、十分に減衰できない音を基材2に吸音させたり、あるいは車両用フロアマット1の裏側に設置される他の吸音材に吸音させたりすることができる。 (5) In the above embodiment, the backing layer 3 has air permeability of 5cc / cm 2 / sec~20cc / cm 2 / sec. Therefore, the backing layer 3 can propagate sound that cannot be sufficiently attenuated to the back side. As a result, the backing layer 3 can cause the base material 2 to absorb sound that cannot be sufficiently attenuated, or can cause other sound absorbing material installed on the back side of the vehicle floor mat 1 to absorb sound.

なお、本発明は以下のように変更して具体化することもできる。
・上記実施形態では、吸音材を車両用フロアマットとして具体化したが、これに限らず、例えば、吸音材を車両用カーペットや内装パネルなどに具体化してもよく、音を吸音するものであればよい。
In addition, this invention can also be changed and embodied as follows.
In the above embodiment, the sound absorbing material is embodied as a vehicle floor mat. However, the present invention is not limited to this. For example, the sound absorbing material may be embodied in a vehicle carpet or an interior panel, and may absorb sound. That's fine.

・上記実施形態では、発泡樹脂材料の加熱(乾燥)温度に差を設けて、発泡倍率に勾配を持たせる構成にした。これに限らず、例えば、発泡樹脂材料の加熱(乾燥)時間に差を設けて、発泡倍率に勾配を持たせる構成にしてもよい。   -In the said embodiment, it was set as the structure which provides the difference in the heating (drying) temperature of a foamed resin material, and has a gradient in a foaming ratio. For example, a difference may be provided in the heating (drying) time of the foamed resin material so that the foaming magnification has a gradient.

本発明を具体化した車両用フロアマットの断面図。Sectional drawing of the floor mat for vehicles which actualized this invention. 同じく、発泡層のSEM画像。Similarly, SEM image of the foam layer. 同じく、車両用フロアマットの製造システムを説明する説明図。Similarly, explanatory drawing explaining the manufacturing system of the floor mat for vehicles. 同じく、発泡層の垂直入射吸音率を説明する説明図。Similarly, explanatory drawing explaining the normal incidence sound absorption coefficient of a foaming layer. 同じく、車両用フロアマットの残響室法吸音率を説明する説明図。Similarly, explanatory drawing explaining the reverberation room method sound absorption rate of a floor mat for vehicles.

符号の説明Explanation of symbols

1…吸音材としての車両用フロアマット、2…基材、3…発泡層としてのバッキング層、3H…高発泡倍率層、3L…低発泡倍率層、4…表皮材、10…車両用フロアマットの製造システム。
DESCRIPTION OF SYMBOLS 1 ... Vehicle floor mat as a sound absorbing material, 2 ... Base material, 3 ... Backing layer as a foam layer, 3H ... High foaming magnification layer, 3L ... Low foaming magnification layer, 4 ... Skin material, 10 ... Vehicle floor mat Manufacturing system.

Claims (2)

表皮材の裏面に発泡樹脂材料を塗布する塗布工程と、
前記発泡樹脂材料を塗布した状態で、前記表皮材の表面側を所定温度で加熱し、前記表皮材の裏面側を前記所定温度より高い温度で加熱して前記表皮材の裏面に接着する発泡層を形成するとともに、前記表皮材から前記発泡層に向う方向に前記発泡層の発泡倍率を高くする発泡工程と、
を備え
前記発泡工程は、
前記表皮材側を所定温度で加熱するとともに、同時に、前記表皮材の裏面側を前記所定温度よりも高い温度で加熱することを特徴とする吸音材の製造方法。
An application step of applying a foamed resin material to the back surface of the skin material;
With the foamed resin material applied, a foam layer that heats the surface side of the skin material at a predetermined temperature and heats the back surface side of the skin material at a temperature higher than the predetermined temperature to adhere to the back surface of the skin material And a foaming step of increasing the foaming ratio of the foam layer in the direction from the skin material toward the foam layer,
Equipped with a,
The foaming step includes
A method for producing a sound-absorbing material , comprising heating the skin material side at a predetermined temperature and simultaneously heating the back surface side of the skin material at a temperature higher than the predetermined temperature .
表皮材と基材のいずれか一方に発泡樹脂材料を塗布する塗布工程と、
前記発泡樹脂材料を介して前記表皮材と前記基材とを貼り合わせる貼合工程と、
前記表皮材と前記基材を貼り合せた状態で、前記表皮材側と前記基材側をそれぞれ所定温度と前記所定温度よりも高い温度で加熱して前記表皮材と前記基材に接着する発泡層を形成し、前記発泡層の発泡倍率を前記表皮材側から前記基材側に向かって高くする発泡工程と、
を備え
前記発泡工程は、
前記表皮材側を所定温度で加熱するとともに、同時に、前記基材側を前記所定温度よりも高い温度で加熱することを特徴とする吸音材の製造方法。
An application step of applying a foamed resin material to either the skin material or the base material;
A bonding step of bonding the skin material and the base material through the foamed resin material;
In the state in which the skin material and the base material are bonded together, the skin material side and the base material side are heated at a predetermined temperature and a temperature higher than the predetermined temperature, respectively, and foamed to adhere to the skin material and the base material. Forming a layer and increasing the foaming ratio of the foam layer from the skin material side toward the base material side;
Equipped with a,
The foaming step includes
A method for producing a sound-absorbing material , comprising heating the skin material side at a predetermined temperature and simultaneously heating the base material side at a temperature higher than the predetermined temperature .
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