JPH10205057A - Structure of inorganic core material board - Google Patents
Structure of inorganic core material boardInfo
- Publication number
- JPH10205057A JPH10205057A JP2616997A JP2616997A JPH10205057A JP H10205057 A JPH10205057 A JP H10205057A JP 2616997 A JP2616997 A JP 2616997A JP 2616997 A JP2616997 A JP 2616997A JP H10205057 A JPH10205057 A JP H10205057A
- Authority
- JP
- Japan
- Prior art keywords
- board
- inorganic core
- asbestos
- inorganic
- core board
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は無機系芯材ボードの
構造に関するものであり、さらに詳しくは無機系芯材ボ
ードに石綿を配合することなく、あるいはわずかな含有
量であっても強度や寸法安定性さらには各種材料に適す
るように改質した無機系芯材ボードの構造に係わるもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an inorganic core board, and more particularly, to the strength and dimensions of an inorganic core board without asbestos or a small amount of asbestos. The present invention relates to a structure of an inorganic core board modified to be suitable for various materials and stability.
【０００２】[0002]
【従来の技術】石綿の持つ高抗張力（引っ張り強さ）及
びセメント等との密着性に優れている特性を活かし石綿
セメント製品など建築用材料等に広く使用されてきた
が、永年に亘り石綿粉塵を吸入することにより石綿肺、
さらには肺ガンを併発することがあることから特定化学
物質等障害予防規則（略称：特化則）では特別の管理を
要する物質（管理第２類物質、特別管理物質）となって
いる。特化則が平成７年１月に改正され、この特別の管
理を要する物質として、石綿製品については従来は含有
量が５重量％を越えるものであったのが１重量％を越え
るものと厳しくなった。2. Description of the Related Art Asbestos has been widely used in building materials such as asbestos cement products, taking advantage of its high tensile strength (tensile strength) and excellent adhesiveness with cement and the like. By inhaling asbestosis,
Furthermore, since lung cancer may occur concurrently, it is a substance requiring special management (managed second-class substance, specially controlled substance) in the Prevention Rules for Specific Chemical Substances (abbreviation: specialization regulations). The Special Regulations were revised in January 1995, and as a substance requiring special management, the content of asbestos products, which had conventionally exceeded 5% by weight, was strictly exceeding 1% by weight. became.
【０００３】[0003]
【発明が解決しようとする課題】そこで通常の材料とし
て取り扱うためには石綿の配合量を１重量％以下にしな
ければならなくなったが、１重量％以下では補強効果は
ほとんど期待できぬという新たな問題を生じた。Therefore, in order to handle as a normal material, the amount of asbestos must be reduced to 1% by weight or less, but if it is less than 1% by weight, a new reinforcing effect can hardly be expected. I had a problem.
【０００４】本発明は有害物質である石綿を１重量％を
越えて配合することなく石綿を５重量％以上含む従来の
無機系芯材ボードと同等以上の十分な強度を持った無機
系芯材ボードの構造を提供することを目的とする。[0004] The present invention relates to an inorganic core material having sufficient strength equal to or higher than that of a conventional inorganic core material board containing at least 5% by weight of asbestos without adding more than 1% by weight of asbestos which is a harmful substance. It aims to provide the structure of the board.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
め、この発明は、石綿を含有しないあるいは含有しても
１重量％以下の無機系芯材ボード本体の少なくとも片面
に織布あるいは不織布に熱硬化性樹脂を含浸させた表面
材を設けたものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a woven or nonwoven fabric on at least one side of an inorganic core board body containing no or less than 1% by weight of asbestos. A surface material impregnated with a thermosetting resin is provided.
【０００６】[0006]
【発明の実施の形態】この発明の好適な実施例では、図
１に示すように無機系芯材ボード本体１の片面に表面材
２を設けたものである。無機系芯材ボード本体１として
は「特化則」により石綿含有量が１重量％以下であるも
の、またさらに具体的には気泡コンクリート、モルタ
ル、軽量骨材コンクリート、石綿スレート、珪酸カルシ
ウム板、パーライト板、パルプセメント板、木毛セメン
ト板、木片セメント板、石膏ボード板、ロックウール
板、泡ガラス、石膏ボード、及び、これらの無機系ボー
ドに化粧を施した化粧ボードが挙げられる。表面材２と
しては、ボードの強度アップのために熱硬化性樹脂を含
浸させた織布あるいは不織布が好適に使用される。織
布、不織布としては、特に限定されるものではないが、
ペーパー状、マット状のものが使用され、その材質とし
ては、ガラス繊維、炭素繊維、無機ウイスカー、ロック
ファイバー、ロックウール等の無機繊維、金属繊維、ア
モルファス金属繊維等の金属繊維が例示できる。一方、
織布あるいは不織布に含浸させる熱硬化性樹脂として
は、例えば、フェノール類とアルデヒド類との反応によ
り得られるフェノール樹脂、末端に反応性のエポキシ基
をもつオリゴマーに硬化剤を添加して得られるエポキシ
樹脂、熱硬化エチレン酢酸ビニル共重合体、不飽和ポリ
エステル樹脂、ユリア樹脂、メラミン樹脂、ウレタン樹
脂等が例示でき、自着性の点からフェノール樹脂、メラ
ミン樹脂が特に好ましい。DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a surface material 2 is provided on one side of an inorganic core board body 1 as shown in FIG. The inorganic core board body 1 has an asbestos content of 1% by weight or less according to the "specialization rules", and more specifically, cellular concrete, mortar, lightweight aggregate concrete, asbestos slate, calcium silicate board, Examples include a pearlite board, a pulp cement board, a wool cement board, a wood chip cement board, a gypsum board board, a rock wool board, a foam glass, a gypsum board, and a decorative board obtained by applying a makeup to these inorganic boards. As the surface material 2, a woven or non-woven fabric impregnated with a thermosetting resin is preferably used to increase the strength of the board. Woven and non-woven fabrics are not particularly limited,
Paper-like or mat-like materials are used, and examples of the material include inorganic fibers such as glass fibers, carbon fibers, inorganic whiskers, rock fibers, and rock wool, and metal fibers such as metal fibers and amorphous metal fibers. on the other hand,
Examples of the thermosetting resin to be impregnated into a woven or nonwoven fabric include a phenol resin obtained by a reaction of a phenol and an aldehyde, and an epoxy obtained by adding a curing agent to an oligomer having a reactive epoxy group at a terminal. Resins, thermosetting ethylene-vinyl acetate copolymers, unsaturated polyester resins, urea resins, melamine resins, urethane resins, and the like can be exemplified, and phenol resins and melamine resins are particularly preferred from the viewpoint of self-adhesion.
【０００７】さらに、これらに各種の充填剤、例えば、
ステアリン酸鉛、ジブチル錫ラウレート、カーボンブラ
ック、炭酸カルシウム、チタンホワイト、雲母、ガラス
球、水酸化アルミニウム、酸化アンチモン、トリ（２，
３ジブロモプロピル）ホスフェート、脂肪族スルフォン
酸塩、高級アルコール硫酸エステル等、熱安定剤、強化
剤、着色剤、難燃剤、耐電防止剤等が配合されて使用さ
れる。なお、これらの樹脂のうち、無機系芯材と自着性
のある樹脂、例えばフェノール樹脂、メラミン樹脂等に
あってはそのまま、当該芯材と自着性の劣る樹脂を使用
した場合には、この両者の間に適当な接着剤を介して、
加熱圧着して一体の無機系芯材ボードとするものであ
る。Further, various fillers such as, for example,
Lead stearate, dibutyltin laurate, carbon black, calcium carbonate, titanium white, mica, glass spheres, aluminum hydroxide, antimony oxide, tri (2,
A heat stabilizer, a reinforcing agent, a coloring agent, a flame retardant, an antistatic agent, and the like, such as 3dibromopropyl) phosphate, an aliphatic sulfonate, a higher alcohol sulfate, and the like are blended and used. In addition, among these resins, inorganic core material and self-adhesive resin, such as phenol resin, melamine resin and the like, as it is, when using the core material and self-adhesive resin is used, With a suitable adhesive between the two,
It is heated and pressed to form an integral inorganic core board.
【０００８】また、図２に示すように無機系芯材ボード
本体１の少なくとも一方側の内部に耐引張補強材３を配
置することもできる。耐引張補強材３としては、引張破
断時の伸びが無機系芯材ボード本体１よりも大きいも
の、例えば、熱硬化性樹脂を含浸させた表面材２と同様
のプリプレグを使用することができる。なお、耐引張補
強材３としては、上記以外にもガラス繊維織物の他、セ
ラミック、ロックウール等の無機系のものや、ポリエス
テル、アクリル、ビニロン、ポリプロピレン等の有機系
の織物、ネット、不織布等が挙げられる。Further, as shown in FIG. 2, a tension-resistant reinforcing member 3 can be arranged inside at least one side of the inorganic core board body 1. As the tensile strength reinforcing material 3, a material having a larger elongation at the time of tensile fracture than the inorganic core board body 1, for example, a prepreg similar to the surface material 2 impregnated with a thermosetting resin can be used. In addition, as the tensile strength reinforcing material 3, besides the above, in addition to the glass fiber fabric, an inorganic fabric such as ceramic and rock wool, an organic fabric such as polyester, acrylic, vinylon, and polypropylene, a net, and a nonwoven fabric. Is mentioned.
【０００９】実施例１ 無機系芯材ボード本体 … 珪酸カルシウム板（石綿含
有率０％） 表面材（片面貼着） … フェノール樹脂含浸ガラス
ペーパー（ガラスペーパー：１００g/m2、樹脂含有量：
２００g/m2） 本体と表面材とを熱プレスにより熱圧着 Example 1 Inorganic core board body: calcium silicate plate (0% asbestos content) Surface material (single-sided sticking): phenolic resin-impregnated glass paper (glass paper: 100 g / m 2 , resin content:
200g / m 2 ) Thermo-compression of main body and surface material by hot press
【００１０】実施例２ 無機系芯材ボード本体 … 実施例１と同一 表面材（両面貼着） … 実施例１と同一 熱圧着のプレス条件は実施例１と同一であり、図３に示
す。 Example 2 Inorganic core board body ... Same as in Example 1 Surface material (adhered to both sides) ... Same as in Example 1 Pressing conditions for thermocompression bonding are the same as in Example 1 and are shown in FIG.
【００１１】実施例３ 無機系芯材ボード本体 … 実施例１と同一 表面材（片面貼着） … ガラスマット補強ウレタン
樹脂（ガラスマット：４５０g/m2、ウレタン樹脂：２kg
/m2 ） 下型中に本体、表面材のガラスマットの順に重ねてセッ
トし、上型をウレタン吹き込み用のノズルが入るだけの
隙間を残して締め、ノズルからウレタンを吹き込み、吹
き込み後に上下金型を完全に締めて成形する。ウレタン
発泡倍率は２倍とした。プレス条件は、圧力１０kgｆ/c
m2、温度１５０℃、時間１０分とした。 Example 3 Inorganic core board body: Same as in Example 1 Surface material (one-sided sticking): Glass mat reinforced urethane resin (glass mat: 450 g / m 2 , urethane resin: 2 kg)
/ m 2 ) Set the main body and the surface material glass mat on top of each other in the lower mold in order, tighten the upper mold with leaving a gap enough for the nozzle for urethane injection, blow urethane from the nozzle, and Completely mold the mold. The urethane expansion ratio was set to 2 times. Pressing conditions are pressure 10kgf / c
m 2 , temperature 150 ° C., time 10 minutes.
【００１２】実施例４ 無機系芯材ボード本体 … 実施例１と同一 表面材（片面貼着） … 実施例１と同一 表面材のみを１５０℃、１０kgｆ/cm2、１０分でプレス
硬化させた後、エポキシ樹脂系接着剤により本体に貼付
した。 Example 4 Inorganic core board main body: Same as in Example 1 Surface material (single-sided sticking): Same as in Example 1 Only the surface material was press-cured at 150 ° C., 10 kgf / cm 2 , and 10 minutes. After that, it was attached to the main body with an epoxy resin adhesive.
【００１３】実施例５ 無機系芯材ボード本体 … 実施例１と同一 表面材（両面貼着） … フェノール樹脂含浸ガラス
ペーパー（ガラスペーパー：１００g/m2、樹脂含有量：
３００g/m2） 実施例１と同一条件の熱プレスによる熱圧着。 Example 5 Inorganic core board body Same as in Example 1 Surface material (adhered to both sides) Phenolic resin impregnated glass paper (glass paper: 100 g / m 2 , resin content:
300 g / m 2 ) Thermocompression bonding by a hot press under the same conditions as in Example 1.
【００１４】実施例６ 無機系芯材ボード本体 … 珪酸カルシウム化粧板 表面材（片面貼着） … フェノール樹脂含浸ガラス
ネット（ガラスネット：Ｅネット、繊維デニール：１２
００、打込本数（本／cm):４×４（縦糸×横糸）、樹脂
含有量：２００g/m2） 実施例１と同一条件の熱プレスによる熱圧着。 Example 6 Inorganic core board body: Calcium silicate decorative board Surface material (adhered to one side): Phenolic resin impregnated glass net (glass net: E net, fiber denier: 12)
00, number of threads (pieces / cm): 4 × 4 (warp × weft), resin content: 200 g / m 2 ) Thermocompression bonding using a hot press under the same conditions as in Example 1.
【００１５】実施例７ 無機系芯材ボード本体 … 実施例５と同一 表面材（片面貼着） … メラミン樹脂含浸ガラスペ
ーパー（ガラスペーパー：１００g/m2、樹脂含有量：３
００g/m2） 実施例１と同一条件の熱プレスによる熱圧着。 Example 7 Inorganic core board body: Same as in Example 5 Surface material (adhered to one side): Melamine resin impregnated glass paper (glass paper: 100 g / m 2 , resin content: 3)
00g / m 2 ) Thermocompression bonding using a hot press under the same conditions as in Example 1.
【００１６】 比較例１ … 石綿含有率５％の石綿スレート 比較例２ … 石綿含有率１％の珪酸カルシウム板 比較例３ … 石綿含有率０％の珪酸カルシウム板 比較例４ … 石綿含有率０％の珪酸カルシウム板の 両面に化粧層（塗装又はフィルム）を設けた。 比較例５ … 石綿含有率０％の珪酸カルシウム板の片
面に化粧層（塗装又はフィルム）を設けた。Comparative Example 1 ... Asbestos slate with 5% asbestos content Comparative Example 2 ... Calcium silicate plate with 1% asbestos content Comparative Example 3 ... Calcium silicate plate with 0% asbestos content Comparative Example 4 ... 0% asbestos content A decorative layer (paint or film) was provided on both sides of the calcium silicate plate. Comparative Example 5 A decorative layer (paint or film) was provided on one side of a calcium silicate plate having an asbestos content of 0%.
【００１７】上述した実施例１〜７と比較例１〜５のサ
ンプルサイズを長さ３００mm、幅１５０mm、厚さ６mmと
したものを、３点曲げ試験（曲げ速度５０mm／分、測定
温度を室温とした）を行なった。その結果は表１の如く
になった。単位はkg/cm2である。Samples of Examples 1 to 7 and Comparative Examples 1 to 5 having a length of 300 mm, a width of 150 mm and a thickness of 6 mm were subjected to a three-point bending test (bending speed: 50 mm / min, measurement temperature: room temperature). Was performed). The results are as shown in Table 1. The unit is kg / cm 2 .
【００１８】[0018]
【表１】 [Table 1]
【００１９】次に、無機系芯材ボード本体１として気泡
コンクリートを使用し、フェノール樹脂含浸ガラスペー
パー（ガラスペーパー：１００g/m2、樹脂含有量：２０
０g/m2）を表面材２とし、本体１の片面のみ表面材２を
設けたものを実施例８とし、両面に設けたものを実施例
９とし、比較例６として気泡コンクリートのみのもの
を、夫々長さ３００mm、幅１５０mm、厚さ３７mmのサン
プルを用意して上述した条件と同一条件で３点曲げ試験
を行なった。その結果は、実施例８で３０３kg/cm2、実
施例９で３５０kg/cm2、比較例６で１３５kg/cm2であっ
た。Next, cellular concrete was used as the inorganic core board body 1 and phenol resin impregnated glass paper (glass paper: 100 g / m 2 , resin content: 20)
0g / m 2 ) as the surface material 2, the body 1 provided with the surface material 2 on only one side is referred to as Example 8, the one provided on both sides as Example 9, and the comparative example 6 provided only with cellular concrete. A sample having a length of 300 mm, a width of 150 mm and a thickness of 37 mm was prepared and subjected to a three-point bending test under the same conditions as those described above. As a result, 303kg / cm 2 in Example 8, 350 kg / cm 2 in Example 9 was 135 kg / cm 2 in Comparative Example 6.
【００２０】上述した実施例１〜９のいずれも石綿を含
有させていないが、「特化例」に適合する範囲内で含有
させることもできる。Although none of the above-mentioned Examples 1 to 9 contains asbestos, they can be contained within a range compatible with the "specialized example".
【００２１】図４は表面材２を本体１の片面にのみ貼着
した場合、他の片面に加飾層４を設けた例を示す。この
加飾層４は塗装したりフィルムや薄い化粧板を貼ったり
したもの等から成る。FIG. 4 shows an example in which the surface material 2 is adhered to only one surface of the main body 1 and the decorative layer 4 is provided on the other surface. The decorative layer 4 is made of a material such as a painted material or a film or a thin decorative plate.
【００２２】[0022]
【発明の効果】以上説明したように、この発明によれ
ば、石綿を含有しないあるいは含有しても１重量％以下
の無機系芯材ボード本体の少なくとも片面に織布あるい
は不織布に熱硬化性樹脂を含浸させた表面材を設けたの
で、石綿を５重量％以上含む従来の無機系芯材ボードと
同等以上の十分な強度を有する。また、「特化則」にも
適合し、無公害の無機系芯材ボードを提供することがで
きる。As described above, according to the present invention, at least one surface of the inorganic core board body not containing or containing 1% by weight or less of asbestos contains a thermosetting resin as a woven or nonwoven fabric. Since the surface material impregnated with is provided, it has sufficient strength equal to or higher than that of a conventional inorganic core material board containing 5% by weight or more of asbestos. In addition, it is possible to provide a pollution-free inorganic core board that conforms to the “specialization rules”.
【図１】この発明の好適な実施例を示す断面図。FIG. 1 is a sectional view showing a preferred embodiment of the present invention.
【図２】この発明の他の実施例を示す断面図。FIG. 2 is a sectional view showing another embodiment of the present invention.
【図３】この発明のさらに別の実施例を示す断面図。FIG. 3 is a sectional view showing still another embodiment of the present invention.
【図４】ボード本体の一方片面に表面材を、他方の片面
に加飾層を設けた例を示す。FIG. 4 shows an example in which a surface material is provided on one side of a board body and a decorative layer is provided on the other side.
１ 無機系芯材ボード本体 ２ 表面材 1 Inorganic core board body 2 Surface material
Claims (6)
重量％以下の無機系芯材ボード本体の少なくとも片面に
織布あるいは不織布に熱硬化性樹脂を含浸させた表面材
を設けたことを特徴とする無機系芯材ボードの構造。1. Asbestos does not contain or contains 1
A structure of an inorganic core board characterized in that a woven fabric or a nonwoven fabric impregnated with a thermosetting resin is provided on at least one side of an inorganic core board body of not more than weight%.
ト、モルタル、軽量骨材コンクリート、石綿スレート、
珪酸カルシウム板、パーライト板、パルプセメント板、
木毛セメント板、木片セメント板、石膏ボード板、ロッ
クウール板、泡ガラス、石膏ボード、及び、これらの無
機系ボードに化粧を施した化粧ボードから選択されたも
のであることを特徴とする請求項１に記載の無機系芯材
ボードの構造。2. The inorganic core board body is made of cellular concrete, mortar, lightweight aggregate concrete, asbestos slate,
Calcium silicate board, perlite board, pulp cement board,
A wood wool cement board, a wood chip cement board, a gypsum board board, a rock wool board, a foam glass, a gypsum board, and a decorative board obtained by applying a makeup to these inorganic boards. Item 2. The structure of the inorganic core board according to Item 1.
を特徴とする請求項１又は２記載の無機系芯材ボードの
構造。3. The structure of the inorganic core board according to claim 1, wherein a filler is blended in the thermosetting resin.
側の内部に耐引張補強材を配置したことを特徴とする請
求項１〜３のいずれか１項に記載の無機系芯材ボードの
構造。4. The structure of an inorganic core board according to claim 1, wherein a tension-resistant reinforcing material is disposed inside at least one side of the inorganic core board body. .
芯材ボード本体よりも大きいことを特徴とする請求項１
〜４のいずれか１項記載の無機系芯材ボードの構造。5. An elongation at break of tensile strength of the tensile strength reinforcing material is larger than that of the inorganic core board body.
5. The structure of the inorganic core board according to any one of items 4 to 4.
り、熱硬化性樹脂を含浸させた層であることを特徴とす
る請求項１〜５のいずれか１項に記載の無機系芯材ボー
ドの構造。6. The inorganic core material according to claim 1, wherein the tension-resistant reinforcing material is a woven or non-woven fabric, and is a layer impregnated with a thermosetting resin. Board structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2616997A JPH10205057A (en) | 1997-01-24 | 1997-01-24 | Structure of inorganic core material board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2616997A JPH10205057A (en) | 1997-01-24 | 1997-01-24 | Structure of inorganic core material board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10205057A true JPH10205057A (en) | 1998-08-04 |
Family
ID=12186053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2616997A Pending JPH10205057A (en) | 1997-01-24 | 1997-01-24 | Structure of inorganic core material board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10205057A (en) |
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|---|---|---|---|---|
| WO2000036242A1 (en) * | 1998-12-11 | 2000-06-22 | Ibiden Co., Ltd. | Composite building material |
| US6379786B1 (en) | 1997-11-28 | 2002-04-30 | Bridgestone Corporation | Ligneous finishing material |
| JP2009074345A (en) * | 2006-12-04 | 2009-04-09 | Kanaflex Corporation | Lightweight cement panel |
| JP2009074344A (en) * | 2006-10-26 | 2009-04-09 | Kanaflex Corporation | Construction/civil engineering panel |
| JP2009138476A (en) * | 2007-12-08 | 2009-06-25 | Kanaflex Corporation | Lightweight cement panel |
| JP2010007447A (en) * | 2007-10-31 | 2010-01-14 | Kanaflex Corporation | Underground buried box |
| US8323786B2 (en) | 2006-10-26 | 2012-12-04 | Kanaflex Corporation Inc. | Lightweight cement panel |
| TWI380890B (en) * | 2010-11-23 | 2013-01-01 |
-
1997
- 1997-01-24 JP JP2616997A patent/JPH10205057A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6379786B1 (en) | 1997-11-28 | 2002-04-30 | Bridgestone Corporation | Ligneous finishing material |
| WO2000036242A1 (en) * | 1998-12-11 | 2000-06-22 | Ibiden Co., Ltd. | Composite building material |
| JP2009074344A (en) * | 2006-10-26 | 2009-04-09 | Kanaflex Corporation | Construction/civil engineering panel |
| JP2012207525A (en) * | 2006-10-26 | 2012-10-25 | Kanaflex Corporation | Manufacturing method of construction/civil engineering panel |
| US8323786B2 (en) | 2006-10-26 | 2012-12-04 | Kanaflex Corporation Inc. | Lightweight cement panel |
| EP1925760A3 (en) * | 2006-10-26 | 2015-10-14 | Kanaflex Corporation Inc. | Lightweight Cement Panel |
| JP2009074345A (en) * | 2006-12-04 | 2009-04-09 | Kanaflex Corporation | Lightweight cement panel |
| JP2010007447A (en) * | 2007-10-31 | 2010-01-14 | Kanaflex Corporation | Underground buried box |
| JP2009138476A (en) * | 2007-12-08 | 2009-06-25 | Kanaflex Corporation | Lightweight cement panel |
| TWI380890B (en) * | 2010-11-23 | 2013-01-01 |
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