JP2015218543A - Direct flooring material - Google Patents

Direct flooring material Download PDF

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JP2015218543A
JP2015218543A JP2014104829A JP2014104829A JP2015218543A JP 2015218543 A JP2015218543 A JP 2015218543A JP 2014104829 A JP2014104829 A JP 2014104829A JP 2014104829 A JP2014104829 A JP 2014104829A JP 2015218543 A JP2015218543 A JP 2015218543A
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thickness
flooring
material layer
denier
fibers
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角田　敬
Takashi Tsunoda
敬 角田
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Panasonic Intellectual Property Management Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a direct flooring material capable of satisfying both of soundproof performance and walking comfort.SOLUTION: A direct flooring material 10 has a cushioning material layer 14 which is formed of a nonwoven fabric on the rear face of a flooring material body 12. The cushioning material layer 14 is formed of a combination of thick fibers with fiber thickness of 15 denier or more and fine fibers with fiber thickness of less than 15 denier. The proportion of the thick fibers is 16-35%, the basis weight is 300 g/mor more, and the thickness is 6.0-7.0 mm.

Description

本発明は、マンションや一般住宅等のフローリングに用いられる直貼り床材に関する。   The present invention relates to a directly pasted flooring material used for flooring of an apartment or a general house.

この種の直貼り床材としては近年、防音性を考慮して、床材本体の裏面に不織布よりなるクッション材層を形成してなるものが種々提案されている（たとえば、特許文献１参照）。   In recent years, various types of directly pasted floor materials have been proposed in which a cushion material layer made of a nonwoven fabric is formed on the back surface of the floor material body in consideration of soundproofing (see, for example, Patent Document 1). .

特開平１１−２８０２４７号公報JP-A-11-280247

しかしながら、この種の直貼り床材では、防音性能を高めるためのクッション材層の仕様によっては、歩行感つまり垂直方向の強度が損なわれる可能性がある。具体的には、クッション材層に空気層を含ませて目付け量を低減させたり、厚みを増大させたりすることで防音性能は高まるが、その程度によって歩行感が悪化するおそれがある。   However, with this type of directly attached flooring material, depending on the specifications of the cushioning material layer for improving the soundproofing performance, the walking feeling, that is, the strength in the vertical direction may be impaired. Specifically, the soundproofing performance is improved by including an air layer in the cushioning material layer to reduce the weight per unit area or increasing the thickness, but the walking feeling may be deteriorated depending on the degree.

また、特許文献１に開示されたものは、床材本体の裏面に下方に開口する複数の溝部が形成されている。これらの溝部は、その空気層により遮音効果を発揮するが、溝部が多数形成されていれば、局部への荷重により変位量が大きくなるから歩行感に悪影響を及ぼすおそれがある。   Moreover, what was disclosed by patent document 1 is formed with the several groove part opened below on the back surface of a flooring main body. These groove portions exhibit a sound insulation effect due to the air layer. However, if a large number of groove portions are formed, the amount of displacement increases due to the load on the local area, which may adversely affect walking feeling.

本発明は、このような事情を考慮して提案されたもので、その目的は、防音性能と歩行感とを両立させた直貼り床材を提供することにある。   The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a directly attached flooring material that achieves both soundproofing performance and a feeling of walking.

上記目的を達成するために、本発明の直貼り床材は、床材本体の裏面に不織布よりなるクッション材層を形成してなる直貼り床材において、クッション材層は、繊維の太さが１５デニール以上の太繊維と、１５デニール未満の細繊維とを組み合わせて形成され、太繊維の比率を１６〜３５％とし、目付け量を３００ｇ／ｍ２以上とし、厚みを６．０ｍｍ〜７．０ｍｍとしたことを特徴とする。 In order to achieve the above object, the directly pasted flooring of the present invention is a directly pasted flooring formed by forming a cushioning material layer made of a nonwoven fabric on the back surface of the flooring main body, and the cushioning material layer has a fiber thickness. It is formed by combining thick fibers of 15 denier or more and fine fibers of less than 15 denier, the ratio of thick fibers is 16 to 35%, the basis weight is 300 g / m 2 or more, and the thickness is 6.0 mm to 7. It is characterized by being 0 mm.

本発明の直貼り床材によれば、上述の構成となっているため、防音性能と歩行感の両方をバランスよく良好にすることができる。   According to the directly pasted flooring of the present invention, since it has the above-described configuration, it is possible to improve both the soundproofing performance and the walking feeling with good balance.

本発明の一実施形態に係る直貼り床材の説明図である。（ａ）は一部を省略した長手方向の縦断面図、（ｂ）は短手方向の縦断面図である。It is explanatory drawing of the directly pasted flooring which concerns on one Embodiment of this invention. (A) is the longitudinal cross-sectional view of the longitudinal direction which abbreviate | omitted one part, (b) is a longitudinal cross-sectional view of the transversal direction. 本直貼り床材の評価表である。It is an evaluation table | surface of this direct pasting flooring. 本直貼り床材の歩行感を示すグラフである。It is a graph which shows the walk feeling of this direct pasting flooring.

以下に、本発明の実施の形態について、添付図面を参照して説明する。まず、以下の実施の形態に係る直貼り床材の概略の構成について説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a schematic configuration of a directly pasted flooring according to the following embodiment will be described.

以下に示す直貼り床材１０は、床材本体１２の裏面に不織布よりなるクッション材層１４を形成してなる。このクッション材層１４は、繊維の太さが１５デニール以上の太繊維と、１５デニール未満の細繊維とを組み合わせて形成されている。またクッション材層１４は、太繊維の比率を１６〜３５％とし、目付け量を３００ｇ／ｍ２以上とし、厚みを６．０ｍｍ〜７．０ｍｍとしたものである。 The directly attached flooring 10 shown below is formed by forming a cushioning material layer 14 made of a nonwoven fabric on the back surface of the flooring main body 12. The cushion material layer 14 is formed by combining a thick fiber having a fiber thickness of 15 denier or more and a fine fiber having a fiber thickness of less than 15 denier. The cushion material layer 14 has a thick fiber ratio of 16 to 35%, a basis weight of 300 g / m 2 or more, and a thickness of 6.0 mm to 7.0 mm.

なお、本明細書、本特許請求の範囲では、繊維の糸の太さの単位が「デニール」で表現してある（図２では「Ｄ」と略記）。デニールは、９０００ｍの糸の質量をｇ（グラム）で表したものであり、繊維の太さを表すための単位である。ＪＩＳ規格により規格化され国際単位系として定められた「テックス」（１０００メートルあたり１グラムの糸の太さを表す単位）を用いる場合には、１デニール＝９テックスの換算式で換算すればよい。   In the present specification and claims, the unit of the thickness of the fiber yarn is expressed by “denier” (abbreviated as “D” in FIG. 2). Denier expresses the mass of a 9000 m yarn in g (grams) and is a unit for expressing the thickness of the fiber. When using “tex” (unit expressing the thickness of 1 gram per 1000 meters) standardized by the JIS standard and defined as an international unit system, conversion may be performed using a conversion formula of 1 denier = 9 tex. .

ついで、図１に示した直貼り床材１０について詳述する。   Next, the directly pasted flooring 10 shown in FIG. 1 will be described in detail.

この直貼り床材１０（以下、床材１０という）は、基材である床材本体１２が合板より形成されたものである。この床材１０は、図１（ａ）、（ｂ）に示すように、床材本体１２の表面に化粧材層１６が形成され、裏面に不織布よりなるクッション材層１４が形成された積層材である。合板としては、本実施形態の実施例、比較例では５プライのものが使用されているが、７プライなど他のものであってもよい。   This directly pasted flooring 10 (hereinafter referred to as flooring 10) is obtained by forming a flooring body 12 as a base material from plywood. As shown in FIGS. 1A and 1B, the flooring 10 is a laminated material in which a decorative material layer 16 is formed on the surface of the flooring main body 12 and a cushioning material layer 14 made of a nonwoven fabric is formed on the back surface. It is. As the plywood, a 5-ply one is used in the examples and comparative examples of the present embodiment, but other plywoods such as a 7-ply may be used.

床材本体１２の裏面には、下方に開口する、鋸加工されたスリット状の複数の溝部１２ａ、１２ａ、・・・が長手方向、短手方向のそれぞれに沿ってクロス状に形成されている（図１（ａ）、（ｂ）参照）。これらの溝部１２ａ、１２ａ、・・・は、その内部の空気層が化粧材層１６から伝わってくる騒音を遮音するように作用する構成となっている。   On the back surface of the flooring main body 12, a plurality of saw-shaped slit-shaped grooves 12a, 12a,... Opening downward are formed in a cross shape along each of the longitudinal direction and the lateral direction. (See FIGS. 1A and 1B). These grooves 12 a, 12 a,... Are configured to act so that the air layer in the interior acts to insulate the noise transmitted from the decorative material layer 16.

以下に説明する試験では、すべての例について、溝部１２ａの本数、幅寸法、深さ寸法を同一とし、かつ床材本体１０の外形を同一とした床材が用いられた。なお、短手方向の溝部１２ａ（横溝）は、幅１．８ｍｍ、深さ６．５ｍｍのものが１１．６ｍｍピッチで７１本形成されている（図１（ａ）参照）。また、長手方向の溝部１２ａ（縦溝）は、幅３．０ｍｍ、深さ６．５ｍｍのものが２本形成されている（図１（ｂ）参照）。   In the tests described below, floor materials having the same number, width, and depth of the groove portions 12a and the same outer shape of the floor material body 10 were used for all examples. 71 grooves having a width of 1.8 mm and a depth of 6.5 mm are formed at a pitch of 11.6 mm (see FIG. 1A). Two longitudinal grooves 12a (longitudinal grooves) having a width of 3.0 mm and a depth of 6.5 mm are formed (see FIG. 1B).

また、床材本体１２の長手方向、短手方向のいずれの方向においても、各方向の一方の側面には実結合用の凸部１２ｂが形成され、他方の側面には凸部１２ｂの形状に合致した凹部１２ｃが形成されている（図１（ａ）、（ｂ）参照）。   Further, in both the longitudinal direction and the short direction of the flooring main body 12, a convex portion 12b for actual coupling is formed on one side surface in each direction, and the convex portion 12b is formed on the other side surface. A matching recess 12c is formed (see FIGS. 1A and 1B).

クッション材層１４を構成する不織布は、たとえばポリエステル、ポリプロピレンなどよりなる。なお、不織布はこれらの素材を組み合わせたものであってもよい。これらの素材を用いることで、安価にクッション材層１４および床材１０を形成することができる。   The nonwoven fabric which comprises the cushioning material layer 14 consists of polyester, a polypropylene, etc., for example. The nonwoven fabric may be a combination of these materials. By using these materials, the cushion material layer 14 and the floor material 10 can be formed at low cost.

このようなクッション材層１４には空気層が含まれているため、床材本体１２にクッション材層１４を積層することで、床材１０の溝部１２ａによる遮音効果とあいまって、防音性能のさらなる向上を図ることができる。   Since such a cushioning material layer 14 includes an air layer, by laminating the cushioning material layer 14 on the flooring main body 12, combined with the sound insulation effect by the groove portion 12 a of the flooring 10, the soundproofing performance is further improved. Improvements can be made.

本発明者は、本実施形態において、クッション材層１４の仕様を種々異ならせた複数の床材１０を用いて、歩行感および防音性能の両性能についての試験を行った（図２参照）。   In the present embodiment, the present inventor conducted tests on both the walking feeling and the soundproofing performance using a plurality of flooring materials 10 with different specifications of the cushioning material layer 14 (see FIG. 2).

クッション材層１４に使用される繊維としては、上述したように、太さが１５デニール以上太繊維と、１５デニール未満の細繊維とが使用された。さらに、以下に説明する実施例、比較例では、つぎに示す、上限値を定め数値範囲で規定した太繊維、下限値を定め数値範囲で規定した細繊維で構成されたクッション材層１４が用いられた。
太繊維：太さが１５デニール以上、３５デニール以下
細繊維：太さが７デニール以上、１５デニール未満 As the fibers used for the cushioning material layer 14, as described above, thick fibers having a thickness of 15 denier or more and fine fibers having a thickness of less than 15 denier were used. Furthermore, in the examples and comparative examples described below, a cushion material layer 14 composed of thick fibers defined with a numerical value range and an upper limit value defined below, and fine fibers defined with a numerical value range defined with a lower limit value is used. It was.
Thick fiber: 15 denier or more and 35 denier or less Thin fiber: Thickness of 7 denier or more and less than 15 denier

本試験におけるクッション材層１４の仕様としては、つぎの３分類に区分されている。
分類（１）（比較例分類）太繊維の繊維比率が５％以上、１６％未満、細繊維の繊維比率が８４％超、９５％以下、目付け量が２００ｇ／ｍ２〜３００ｇ／ｍ２、厚さが６．０ｍｍ〜７．０ｍｍのもの
分類（２）（比較例分類）太繊維の繊維比率が１６％〜３５％、細繊維の繊維比率が６５％〜８４％、目付け量が３００ｇ／ｍ２〜４５０ｇ／ｍ２、厚さが５．０ｍｍ〜６．０ｍｍのもの
分類（３）（実施例分類）太繊維の繊維比率が１６％〜３５％、細繊維の繊維比率が６５％〜８４％、目付け量が３００ｇ／ｍ２〜４５０ｇ／ｍ２、厚さが６．０ｍｍ〜７．０ｍｍのもの
それぞれの分類ごとに図２に示した結果が得られた。 The specification of the cushion material layer 14 in this test is divided into the following three categories.
Classification (1) (comparative example classification) The fiber ratio of thick fibers is 5% or more and less than 16%, the fiber ratio of fine fibers is more than 84%, 95% or less, the basis weight is 200 g / m 2 to 300 g / m 2 , Thickness of 6.0 mm to 7.0 mm Classification (2) (Comparative example classification) The fiber ratio of thick fibers is 16% to 35%, the fiber ratio of fine fibers is 65% to 84%, and the basis weight is 300 g / m 2 to 450 g / m 2 , thickness of 5.0 mm to 6.0 mm Classification (3) (Example classification) Fiber ratio of thick fibers is 16% to 35%, Fiber ratio of fine fibers is 65% to 84%, basis weight 300g / m 2 ~450g / m 2 , thickness is shown in FIG. 2 for each classification as the 6.0mm~7.0mm results.

歩行感については、本発明者は、市場実績のある商品の所定荷重に対する沈み込み量との比較を行い、その商品の沈み込み量以下のものを良好（図２では○と表記）と判断した。   Regarding the feeling of walking, the present inventor made a comparison with the amount of subsidence for a predetermined load of a product with market results, and judged that the product less than the amount of subsidence was good (indicated as ◯ in FIG. 2). .

この沈み込み量の試験は、０Ｎ（ニュートン）から４００Ｎまでの５０Ｎごとの数値の荷重をかけて行うものである。図３のグラフには、上記分類（１）〜（３）に示した繊維比率のうち、太繊維が１５％のもの（分類（１）に含まれるもの）と、太繊維が１６％〜３５％のもの（分類（２）、（３）に含まれるもの）のと各一部の実施例について比較表示してある。このグラフに示したように、太繊維が１６％〜３５％のものは、荷重ごとの全プロットについて目標値よりも小さな沈み込み量であった。つまり、太繊維が１６％〜３５％のものについては、歩行感（垂直方向の強度）についてすぐれていることが判明した。   This subsidence amount test is performed by applying a numerical load every 50N from 0N (Newton) to 400N. In the graph of FIG. 3, among the fiber ratios shown in the above classifications (1) to (3), the thick fibers are 15% (included in the classification (1)) and the thick fibers are 16% to 35. % (Included in classifications (2) and (3)) and a part of each example are comparatively displayed. As shown in this graph, when the thick fibers were 16% to 35%, the amount of subsidence was smaller than the target value for all plots for each load. In other words, it was found that those having thick fibers of 16% to 35% are excellent in walking feeling (strength in the vertical direction).

防音性能については、本発明者は、ＪＩＳ規格に規定されている防音性能試験を行い、遮音性能等級（Ｌ値、特に軽量床衝撃音の等級であるＬＬ値）を求め、ＬＬ値が４０以下のものを良好と判断した。なお、図２に記載されている「低減値」（ΔＬＬ）は軽量床衝撃音低減性能の等級であり、ΔＬＬ値５がＬＬ値４０に概ね対応し、ΔＬＬ値が５以上のものが良好であると判断することができる。   As for the sound insulation performance, the present inventor performs a sound insulation performance test defined in JIS standard to obtain a sound insulation performance grade (L value, particularly a light floor impact sound grade), and the LL value is 40 or less. Was judged good. The “reduction value” (ΔLL) shown in FIG. 2 is a grade of lightweight floor impact noise reduction performance, and ΔLL value 5 generally corresponds to LL value 40, and those with ΔLL value of 5 or more are good. It can be judged that there is.

分類（１）に含まれる床材１０については、防音性能は良好であったが、歩行感がそれほど良くなかった（図２、図３参照）。また、分類（２）の床材１０については、歩行感は良好であったが、防音性能がそれほど良くなかった（図２、図３参照）。   For the flooring material 10 included in the classification (1), the soundproofing performance was good, but the feeling of walking was not so good (see FIGS. 2 and 3). Moreover, about the flooring 10 of the classification (2), although a feeling of walking was favorable, sound insulation performance was not so good (refer FIG. 2, FIG. 3).

この結果は、細繊維の繊維比率が大きければクッション材層１４に含まれる空気層の割合が増えて目付け量が小さくなり、防音性能が向上する一方、歩行感は悪くなる、という両性能の相反関係にもとづくものである。   As a result, if the fiber ratio of the fine fibers is large, the ratio of the air layer contained in the cushioning material layer 14 is increased, the basis weight is reduced, the soundproofing performance is improved, and the feeling of walking is deteriorated. It is based on relationships.

そこで本発明者は、繊維比率、目付け量を分類（２）と同じ数値範囲にし、厚さを分類（２）よりも大きい６．０ｍｍ〜７．０ｍｍとした分類（３）に含まれる複数の実施例について、歩行感と防音性能に関する試験を行った。つまり、分類（２）のものよりも厚みがあり空気層が多く含まれることとなったクッション材層１４を積層した分類（３）に含まれる床材１０について試験が行われた。   Therefore, the present inventor sets the fiber ratio and the basis weight to the same numerical ranges as those of the classification (2), and the thickness is 6.0 mm to 7.0 mm larger than the classification (2). About the Example, the test regarding a walk feeling and soundproof performance was done. That is, the test was performed on the flooring material 10 included in the classification (3) in which the cushioning material layer 14 having a thickness larger than that of the classification (2) and including an air layer was laminated.

その結果、分類（３）に含まれる床材１０については、図２に示すように、歩行感と防音性能がともに良好となることが判明した。   As a result, it was found that the flooring material 10 included in the classification (3) has good walking feeling and soundproofing performance as shown in FIG.

また、分類（２）、（３）のうち、太繊維の繊維比率が２５％〜３０％のものは歩行感が特に安定して良好であることが歩行感の試験により判明している。つまり、本発明者は、分類（３）の条件に合致するものの中で、太繊維の繊維比率が２５％〜３０％のものについては、特に良好であると判断した。   Further, among the classifications (2) and (3), those having a fiber ratio of 25% to 30% of the thick fibers have been found to have a particularly stable and good walking feeling by a walking feeling test. That is, the present inventor has judged that, among those meeting the condition of classification (3), those having a fiber ratio of 25% to 30% are particularly good.

このように、分類（３）で採用したクッション材層１４を用いることで、防音性能と歩行感とを両立させることができた。この効果は、床材本体１２の仕様にかかわらず発揮されるものである。すなわち、床材本体１２がどのような仕様であれ、歩行感については分類（１）のものよりも分類（２）、（３）のものがすぐれ、防音性能については分類（２）のものよりも分類（３）のものがすぐれている。よって、床材本体１２の仕様に関係なくクッション材層１４を分類（３）の仕様にしておけば、防音性能と歩行感の両立が可能である。   Thus, by using the cushion material layer 14 employed in the classification (3), it was possible to achieve both soundproof performance and a feeling of walking. This effect is exhibited regardless of the specifications of the flooring main body 12. That is, whatever the specifications of the flooring main body 12, the walking feeling is superior to those of the classification (2) and (3) than the classification (1), and the soundproof performance is from the classification (2). Class (3) is also excellent. Therefore, if the cushion material layer 14 is set to the classification (3) specification regardless of the specification of the floor material main body 12, both the soundproof performance and the walking feeling can be achieved.

また、溝部１２ａ（横溝）が多数（２０ｍｍ以下のピッチ）形成された床材本体１２、横溝と縦溝がクロスする床材本体１２、またはそれらが組み合わされた床材本体１２を用いた床材は、局部の荷重により変位量が大きくなる可能性が高い。よって、このような床材本体１２に、分類（３）のクッション材層１４を組み合わせることは特に有効である。   In addition, a floor material body 12 in which a large number of grooves 12a (lateral grooves) are formed (a pitch of 20 mm or less), a floor material body 12 in which the horizontal grooves and the vertical grooves cross, or a floor material body 12 using the floor material body 12 in combination of them. Is likely to increase the amount of displacement due to the local load. Therefore, it is particularly effective to combine the cushion material layer 14 of classification (3) with such a floor material body 12.

１０ 直貼り床材、床材
１２ 床材本体
１２ａ 溝部
１２ｂ 凸部
１２ｃ 凹部
１４ クッション材層
１６ 化粧材層 DESCRIPTION OF SYMBOLS 10 Direct pasting floor material, floor material 12 Floor material main body 12a Groove part 12b Convex part 12c Concave part 14 Cushion material layer 16 Cosmetic material layer

Claims (3)

床材本体の裏面に不織布よりなるクッション材層を形成してなる直貼り床材において、
前記クッション材層は、繊維の太さが１５デニール以上の太繊維と、１５デニール未満の細繊維とを組み合わせて形成され、
前記太繊維の比率を１６〜３５％とし、
目付け量を３００ｇ／ｍ２以上とし、
厚みを６．０ｍｍ〜７．０ｍｍとしたことを特徴とする直貼り床材。 In the directly pasted floor material formed by forming a cushion material layer made of nonwoven fabric on the back surface of the floor material body,
The cushion material layer is formed by combining thick fibers having a fiber thickness of 15 denier or more and fine fibers having a thickness of less than 15 denier,
The ratio of the thick fibers is 16 to 35%,
The basis weight is 300 g / m 2 or more,
A directly pasted flooring material having a thickness of 6.0 mm to 7.0 mm. 請求項１において、
前記太繊維の太さが３５デニール以下であり、前記細繊維の太さが７デニール以上である、直貼り床材。 In claim 1,
The directly pasted flooring, wherein the thick fibers have a thickness of 35 denier or less and the fine fibers have a thickness of 7 denier or more. 請求項１または２において、
前記クッション材層を構成する繊維は、ポリエステル、ポリプロピレン、ナイロンのうちの１つまたは複数の組み合わせよりなる、直貼り床材。 In claim 1 or 2,
The fiber constituting the cushion material layer is a directly pasted floor material made of one or a combination of polyester, polypropylene, and nylon.
JP2014104829A 2014-05-21 2014-05-21 Direct flooring material Pending JP2015218543A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932046U (en) * 1982-08-24 1984-02-28 株式会社フジコ− Tatami for bedding
JPH05140847A (en) * 1991-11-16 1993-06-08 Dynic Corp Production of nonwoven fabric for use in flooring
JPH094193A (en) * 1995-06-26 1997-01-07 Central Glass Co Ltd Soundproof floor material
JPH11280247A (en) * 1998-03-30 1999-10-12 Eidai Co Ltd Sound insulating flooring
JP2000257248A (en) * 1999-03-05 2000-09-19 Asahi Chem Ind Co Ltd Cushioning material for floor
US20020056500A1 (en) * 2000-03-28 2002-05-16 Collison Alan B. Insulating floor underlayment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932046U (en) * 1982-08-24 1984-02-28 株式会社フジコ− Tatami for bedding
JPH05140847A (en) * 1991-11-16 1993-06-08 Dynic Corp Production of nonwoven fabric for use in flooring
JPH094193A (en) * 1995-06-26 1997-01-07 Central Glass Co Ltd Soundproof floor material
JPH11280247A (en) * 1998-03-30 1999-10-12 Eidai Co Ltd Sound insulating flooring
JP2000257248A (en) * 1999-03-05 2000-09-19 Asahi Chem Ind Co Ltd Cushioning material for floor
US20020056500A1 (en) * 2000-03-28 2002-05-16 Collison Alan B. Insulating floor underlayment

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