JPH07279175A - Three-dimensional net-like structure - Google Patents
Three-dimensional net-like structureInfo
- Publication number
- JPH07279175A JPH07279175A JP7495094A JP7495094A JPH07279175A JP H07279175 A JPH07279175 A JP H07279175A JP 7495094 A JP7495094 A JP 7495094A JP 7495094 A JP7495094 A JP 7495094A JP H07279175 A JPH07279175 A JP H07279175A
- Authority
- JP
- Japan
- Prior art keywords
- filaments
- filament
- hollow
- dimensional network
- network structure
- 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
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は軽量な立体網状構造体で
あり、軟弱地盤、液状化地盤の排水材の基材、盛土補強
用材などの土木資材、断熱材等に用いることのできる立
体網状構造体に関する。BACKGROUND OF THE INVENTION The present invention is a lightweight three-dimensional reticulated structure, which can be used as a base material for drainage material of soft ground, liquefied ground, civil engineering materials such as embankment reinforcement, and heat insulating material. Regarding the structure.
【０００２】[0002]
【従来の技術】熱可塑性樹脂を用いた立体網状構造体は
多数提案されている。例えば、特公昭５０−３９１８５
では溶融状態を呈している線条をノズルより自然落下さ
せるときその速度より遅く引き取り、しかる後にこれを
急冷固化させる方法がある。これらは各用途に適合する
圧縮特性を考慮した線条を得ることを目的に線条径、線
条の本数が決定され、高い圧縮強度を得るためには太い
線条となり重量は増加してしまう。2. Description of the Related Art Many three-dimensional network structures using a thermoplastic resin have been proposed. For example, Japanese Patent Publication No. 50-39185
Then, there is a method in which when a filament in a molten state is naturally dropped from a nozzle, the filament is taken at a slower speed than that, and then it is rapidly cooled and solidified. The diameter of these filaments and the number of filaments are determined for the purpose of obtaining filaments that take into consideration the compression characteristics suitable for each application, and in order to obtain high compressive strength, they become thick filaments and the weight increases. .
【０００３】[0003]
【発明が解決しようとする課題】しかし、これらの立体
網状構造体においては線条径を細くしたり、線条の本数
を減らすことにより軽量化は可能であるが同時に圧縮特
性が低下してしまう。そこで本発明は、かかる従来の立
体網状構造体の欠点を解消し、線条の断面形態及び中空
部の中空率に工夫を加えて、圧縮特性を保持し、現場作
業性を向上させ軽量化した立体網状構造体を提供するこ
とを、また軽量化により樹脂使用量が減少し、また再生
樹脂を使用することによりコストダウンした製品を提供
することを目的とする。However, in these three-dimensional network structures, it is possible to reduce the weight by reducing the diameter of the filaments or reducing the number of filaments, but at the same time the compression characteristics deteriorate. . Therefore, the present invention solves the drawbacks of the conventional three-dimensional net-like structure, adds a device to the cross-sectional shape of the filament and the hollow ratio of the hollow portion, retains the compression characteristics, improves the workability on site, and reduces the weight. It is an object of the present invention to provide a three-dimensional network structure, to reduce the amount of resin used due to weight reduction, and to provide a cost-reduced product by using recycled resin.
【０００４】[0004]
【課題を解決するための手段】本発明は、前記課題を解
決するために次の手段をとる。すなわち、本発明は、熱
可塑性樹脂からなる多数の線条がループを形成してなる
立体網状構造体において、前記線条の外周長が０．３〜
１５ｍｍの範囲にあり、該線条が異形断面をなし、且つ
該線条が中空率５〜８０％の中空部を有し、該線条が相
互に接着していることを特徴とする立体網状構造体であ
り（請求項１）、また、請求項１の発明において、熱可
塑性樹脂が再生ポリエステル樹脂を５０重量％以上含む
立体網状構造体であり（請求項２）、さらに、請求項１
又は２の発明において、中空部が２個以上線条断面に存
在する立体網状構造体である（請求項３）。The present invention adopts the following means in order to solve the above problems. That is, the present invention provides a three-dimensional network structure in which a large number of filaments made of a thermoplastic resin form a loop, and the filaments have an outer peripheral length of 0.3 to
A three-dimensional net having a range of 15 mm, the filaments having an irregular cross section, the filaments having a hollow portion with a hollow ratio of 5 to 80%, and the filaments being adhered to each other. A structure (Claim 1), and in the invention of Claim 1, the thermoplastic resin is a three-dimensional network structure containing 50% by weight or more of a recycled polyester resin (Claim 2), and
Alternatively, in the second aspect of the invention, the three-dimensional network structure has two or more hollow portions in the filament cross section (claim 3).
【０００５】以下に、本発明を詳細に説明する。本発明
に係る熱可塑性樹脂としては、ポリエチレン、ポリプロ
ピレンなどのポリオレフィン系ポリマー、塩ビ系ポリマ
ー、ポリエステル系ポリマー、ポリアミド系ポリマーが
使用される。The present invention will be described in detail below. As the thermoplastic resin according to the present invention, polyolefin-based polymers such as polyethylene and polypropylene, vinyl chloride-based polymers, polyester-based polymers and polyamide-based polymers are used.
【０００６】オレフィン系ポリマーはポリエチレン、ポ
リプロピレンなどのポリオレフィン系の中から選ばれる
ホモポリマーまたは、コポリマーが好ましく、また、こ
れらは２種類以上のポリマーを混合して用いてもよい。The olefin polymer is preferably a homopolymer or a copolymer selected from polyolefins such as polyethylene and polypropylene, and these may be used as a mixture of two or more kinds of polymers.
【０００７】ポリエステル系ポリマーとしてはテレフタ
ル酸を主たる酸成分とし、少なくとも１種のグリコー
ル、好ましくエチレングリコール、トリメチレングリコ
ール、テトラメチレングリコールから選ばれる少なくと
も１種のアルキレングリコールをグリコール成分とする
ポリエステルを主たる対象とする。また、テレフタル酸
成分の一部を他の２官能性カルボン酸成分で置換したポ
リエステルであってもよく、および／またはグリコール
成分の一部を主成分以外の上記グリコールもしくは他の
ジオール成分で置換したポリエステルであってもよい。
ここで使用されるテレフタル酸以外の２官能カルボン酸
としては、例えばイソフタル酸、ナフタリンジカルボン
酸、ジフェニルカルボン酸、ジフェノキシエタンジカル
ボン酸、β−ヒドロキシエトキシ安息香酸、ρ−オキシ
安息香酸、アジピン酸、セバシン酸、１、４−シクロヘ
キサンジカルボン酸の芳香族、脂肪族、脂環族の二官能
性カルボン酸を挙げることが出来る。これらの中から選
ばれるホモポリマー、またはコポリマーが好ましく、ま
た、これらは２種類以上のポリマーを混合して用いても
良い。As the polyester polymer, a polyester having terephthalic acid as a main acid component and at least one glycol, preferably at least one alkylene glycol selected from ethylene glycol, trimethylene glycol and tetramethylene glycol as a glycol component is mainly used. set to target. Further, it may be a polyester in which a part of the terephthalic acid component is replaced with another difunctional carboxylic acid component, and / or a part of the glycol component is replaced with the above glycol or other diol component other than the main component. It may be polyester.
Examples of the bifunctional carboxylic acid other than terephthalic acid used here include isophthalic acid, naphthalene dicarboxylic acid, diphenyl carboxylic acid, diphenoxyethane dicarboxylic acid, β-hydroxyethoxybenzoic acid, ρ-oxybenzoic acid, adipic acid, Aromatic, aliphatic, and alicyclic difunctional carboxylic acids of sebacic acid and 1,4-cyclohexanedicarboxylic acid can be mentioned. A homopolymer or a copolymer selected from these is preferable, and these may be used as a mixture of two or more kinds of polymers.
【０００８】また、再生ポリエステル樹脂としては使用
後そのまま廃棄されていた樹脂成形品の再生可能な樹脂
や製造工程において発生する不良品、屑等の樹脂が好適
に使用され、かつ糸条または線条の多数をノズルより紡
出して自然落下させ、褶曲させる溶融押出において基材
となる再生熱可塑性樹脂として必要とされる強度に耐え
うる機械的強度を持つものであれば良いが、本発明にお
いては、ポリエステル樹脂を５０重量％以上含有するこ
とが好ましく、５０重量％未満であればコストダウンの
効果がない。Further, as the recycled polyester resin, a recyclable resin of a resin molded product which has been discarded as it is after use or a resin such as a defective product or scrap generated in the manufacturing process is preferably used, and a yarn or a line is used. Many of them are spun from a nozzle and are naturally dropped, and as long as they have mechanical strength capable of withstanding the strength required as a recycled thermoplastic resin which is a base material in melt extrusion for folding, in the present invention, It is preferable to contain the polyester resin in an amount of 50% by weight or more, and if it is less than 50% by weight, there is no cost reduction effect.
【０００９】本発明の立体網状構造体は、前記熱可塑性
樹脂からなる線条がループを形成してなるものである
が、かかるループが充分圧縮強度に耐えることが必要で
あり、そのためにも線条の外周長は０．３〜１５ｍｍの
範囲になることが好適であり、０．３ｍｍ未満になると
得られた立体網状構造体の圧縮強度が不足する。また、
外周長が１５ｍｍをこえると圧縮特性は十分満足される
が立体網状構造体の重量が増加し生産性、現場での作業
性も悪くなってしまう。In the three-dimensional network structure of the present invention, the filaments made of the thermoplastic resin form loops, and it is necessary that such loops withstand sufficient compressive strength, and for that purpose the line is also required. The outer peripheral length of the strip is preferably in the range of 0.3 to 15 mm, and if it is less than 0.3 mm, the compressive strength of the obtained three-dimensional network structure will be insufficient. Also,
If the outer peripheral length exceeds 15 mm, the compression characteristics are sufficiently satisfied, but the weight of the three-dimensional network structure increases, and the productivity and workability on site deteriorate.
【００１０】なお、ループの大きさは、別段限定はない
が、ループ内径が２ｍｍ未満になると排水材の基材とし
て用いた場合などには透水性が低下し、他方、ループ内
径が６０ｍｍをこえると製品の厚みの調整が困難になる
との理由から相当ループ内径で２ｍｍ〜６０ｍｍが好ま
しい。The size of the loop is not particularly limited, but if the inner diameter of the loop is less than 2 mm, the water permeability decreases when it is used as a base material of drainage material, while the inner diameter of the loop exceeds 60 mm. Since it is difficult to adjust the thickness of the product, the equivalent loop inner diameter is preferably 2 mm to 60 mm.
【００１１】また、線条の断面を異形化することで線条
自体の圧縮特性も向上し、高荷重下での線条の単糸の破
壊を防いで立体網状構造体の圧縮特性も向上するので好
ましい。異形の例として、角のとれた四角形、偏平、長
方形、三角形、五角形、八角形、楕円などが挙げられ
る。Further, by deforming the cross section of the filament, the compressive characteristic of the filament itself is improved, and the single yarn of the filament is prevented from being broken under a high load, and the compressive characteristic of the three-dimensional network structure is also improved. Therefore, it is preferable. Examples of irregular shapes include squares with sharp corners, flats, rectangles, triangles, pentagons, octagons, ellipses, and the like.
【００１２】さらに線条は、中空率５〜８０％の中空部
を有する。中空率が５％未満では軽量化の効果が小さ
く、また中空率８０％をこえると得られた線条の樹脂部
分が薄くなり各線条の圧縮強度が低下し、これらで構成
された立体網状構造体の圧縮特性も満足な物が得られな
い。好ましくは、２０％〜７０％が好ましい。また、中
空部は、線条の長手方向において連続していても、また
は不連続であっても良い。Further, the filament has a hollow portion having a hollow ratio of 5 to 80%. If the hollow ratio is less than 5%, the effect of weight reduction is small, and if the hollow ratio exceeds 80%, the resin portion of the obtained filaments becomes thin and the compressive strength of each filament decreases, resulting in a three-dimensional network structure composed of these. Satisfactory compression characteristics of the body cannot be obtained. 20% to 70% is preferable. In addition, the hollow portion may be continuous or discontinuous in the longitudinal direction of the filament.
【００１３】なお、前記中空部は１個に限らず、２個以
上でも良く、他方、８個以下が軽量効果を出すため好ま
しい。特に田字形のものが圧縮特性の上から好ましい。
そして、中空部の形状は、丸でも、楕円、三角形、四角
形、五角形、八角形などの多角形、星形などであっても
良い。The number of hollow portions is not limited to one, but may be two or more. On the other hand, eight or less are preferable because they provide a lightweight effect. Particularly, a paddle shape is preferable from the viewpoint of compression characteristics.
The shape of the hollow portion may be a circle, an ellipse, a triangle, a quadrangle, a polygon such as a pentagon, an octagon, or a star.
【００１４】中空率の測定は、下記の方法で行なう。す
なわち、試料の単糸をランダムに１０本採取し、ビデオ
マイクロスコープシステム（ウイルソン社製ＣＶＭ−７
０００）により３０倍の倍率で断面写真をとり、その写
真を用いてノギスにより単糸の断面積、中空部の断面積
を測定し、その平均値を用いて下記の式より中空率を求
めた。 （中空部断面積／単糸断面積）×１００＝中空率（％）The hollowness is measured by the following method. That is, ten monofilament yarns were randomly sampled, and a video microscope system (CVM-7 manufactured by Wilson Co., Ltd.) was used.
000) and a cross-section photograph at a magnification of 30 times, the cross-section area of the single yarn and the cross-section area of the hollow portion were measured with a caliper using the photograph, and the hollow ratio was calculated from the following formula using the average value thereof. . (Hollow part cross-sectional area / single yarn cross-sectional area) x 100 = hollow ratio (%)
【００１５】さらに、前記線条は相互に接触点で接着し
ていなければならない。これは、ループを安定して維持
し、圧縮強度を高めるためである。Further, the filaments must be adhered to each other at the contact points. This is to keep the loop stable and increase the compressive strength.
【００１６】次に本発明の製造方法について述べる。立
体網状構造体は一般的な溶融押出機を用いて複数の中空
断面形成性を有する複数のオリフィスより、熱可塑性樹
脂を吐出させ中空断面を形成した溶融状態の吐出線条を
曲がりくねらせ互いに接触させて、接触部を溶融接着さ
せ３次元構造を形成しつつ、引取り装置で挟み込み、次
いで冷却槽で冷却せしめ立体網状構造体を製造する。Next, the manufacturing method of the present invention will be described. The three-dimensional network structure uses a general melt extruder to discharge a thermoplastic resin from a plurality of orifices having a plurality of hollow cross-sections, and the melted discharge filaments having a hollow cross-section are bent to make contact with each other. Then, the contact portion is melt-bonded to form a three-dimensional structure, sandwiched by a take-up device, and then cooled in a cooling tank to manufacture a three-dimensional network structure.
【００１７】糸条を中空にする技術は一般的にＣ型のノ
ズルから線条を押し出す方法、空気圧を利用する方法な
どあるがこれらに限定されるものではない。尚、冷却媒
体より比重が高い熱可塑性樹脂でも、見かけの比重を低
くすることができるため、溶融状態での吐出線条に浮力
が発生して、溶融状態のままで樹脂が接触時間が増加す
ることにより接着面積が増え、接着強力が向上すること
により、より圧縮特性の優れた立体網状構造体が得られ
る。立体網状構造体を軟弱地盤、液状化地盤の排水材の
基材、盛土補強用材等の土木資材、寝具、家具、車両な
どに用いるときには空隙率を８０〜９７％の範囲内にす
ることによりバランスの取れた立体網状構造体が得られ
る。Techniques for hollowing the yarn are generally, but not limited to, a method of extruding the filament from a C-shaped nozzle and a method of utilizing air pressure. Even with a thermoplastic resin having a higher specific gravity than the cooling medium, since the apparent specific gravity can be lowered, buoyancy is generated in the discharge filament in the molten state, and the contact time of the resin increases in the molten state. As a result, the adhesive area is increased and the adhesive strength is improved, so that a three-dimensional network structure having more excellent compression characteristics can be obtained. When the three-dimensional net structure is used for soft ground, drainage base material of liquefied ground, civil engineering materials such as embankment reinforcement, bedding, furniture, vehicles, etc., balance by setting the porosity within the range of 80 to 97%. A solid three-dimensional network structure can be obtained.
【００１８】また、立体網状構造体の性質を損なわない
程度に繊維補強材、充填材、着色剤、安定剤、結晶化促
進剤その他各剤を的時配合してもよい。なお、本発明の
立体網状構造体の形態としては、板状、筒状、柱状、棒
状など種々の形態が考えられる。Further, a fiber reinforcing material, a filler, a coloring agent, a stabilizer, a crystallization accelerator and other various agents may be blended as appropriate so long as the properties of the three-dimensional network structure are not impaired. As the form of the three-dimensional network structure of the present invention, various forms such as a plate form, a cylinder form, a column form, and a rod form can be considered.
【００１９】本発明においては、立体網状構造体の各線
条の中空率が５〜８０％の連続及びまたは不連続な中空
状、異形断面形状を持つことにより各線条の圧縮強度が
十分保持され、またこれら線条が相互に多数の溶融接着
点を持ち、多数の線条から構成された立体網状構造体は
圧縮時の強度、歪み、回復各特性に優れ、かつ軽量化さ
れた立体網状構造体が得られる。In the present invention, the compressive strength of each filament is sufficiently maintained by having a continuous and / or discontinuous hollow or irregular sectional shape in which the hollow ratio of each filament of the three-dimensional network structure is 5 to 80%. In addition, these filaments have a large number of fusion bonding points with each other, and the three-dimensional network structure composed of a number of filaments has excellent strength, strain, and recovery characteristics during compression, and is a lightweight three-dimensional network structure. Is obtained.
【００２０】[0020]
【実施例】以下に実施例を本発明を詳述するが、本発明
はこれによって限定されるものではない。なお、諸物性
の測定方法は下記の通りである。 重量 試料１ｍ2 分の重量EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. The methods for measuring various physical properties are as follows. Weight Sample 1 m 2 Weight
【００２１】圧縮強度（２０％歪時、５０％歪時） ＪＩＳ Ｋ７２０８−１９７５で測定し、圧縮強度を歪
み率２０％，５０％のときの値で求める。なお、具体的
には下記の手順で測定した。圧縮用治具として直径１５
ｃｍの平面円板型の金具をテンシロンの下部に固定し、
圧縮用ロードセルに同様な直径１５ｃｍの平面円板型治
具を装着したものを用意し、治具より小さい断面積の試
料の厚み、断面積を測定したものを下部治具上に置き、
２ｍｍ／分の測定速度で応力を測定し、厚みに対して２
０％、５０％まで歪んだときの応力を断面積で割ったも
のを圧縮強度とした。Compressive strength (at 20% strain, at 50% strain) It is measured by JIS K7208-1975, and the compressive strength is obtained by the value when the strain rate is 20% and 50%. In addition, specifically, it measured by the following procedures. Diameter 15 as a compression jig
Clamp a flat disc type metal fitting to the bottom of the Tensilon,
Prepare a load cell for compression equipped with a similar flat disk type jig with a diameter of 15 cm, and place the measured thickness and cross-sectional area of the sample having a cross-sectional area smaller than the jig on the lower jig.
Stress is measured at a measurement speed of 2 mm / min, and the thickness is 2
The compressive strength was obtained by dividing the stress when strained to 0% and 50% by the cross-sectional area.
【００２２】なお、立体網状構造体の作成は、次の処方
で行なった。スクリュー径５０ｍｍの単軸押出機にてシ
リンダー温度を２４０℃に設定し、各ノズル形状が５０
穴のノズル群から紡出し、このノズル面より１０ｃｍ下
方に冷却水を配するとともに同冷却水中に一対の引取り
用コンベアを設置し、これを毎分０．５ｍの速度で水中
に引き取り、厚さ３ｃｍ、幅２０ｃｍの立体網状構造体
を得る。The three-dimensional network structure was prepared by the following prescription. The cylinder temperature was set to 240 ° C with a single screw extruder with a screw diameter of 50 mm, and each nozzle shape was 50
It is spun out from a nozzle group of holes, cooling water is arranged 10 cm below the nozzle surface, and a pair of take-up conveyors are installed in the cooling water. A three-dimensional net-like structure having a size of 3 cm and a width of 20 cm is obtained.
【００２３】[0023]
実施例１ ２３０℃のメルトインデックスが８ｇ／１０分のポリプ
ロピレンを用いて１辺が１．５ｍｍで１本の糸条の中に
４個の中空を持つ田字型中空ノズルを用い、中空部に供
給する窒素ガス圧力０．０１ｋｇ／ｃｍ2 、樹脂吐出量
２４ｋｇ／時、線条の外周長が９ｍｍとなるように上述
の製造条件において立体網状構造体を作成した。得られ
た立体網状構造体の重量、圧縮特性を測定した結果を表
１に示す。Example 1 Polypropylene having a melt index at 230 ° C. of 8 g / 10 min, a side of 1.5 mm, and a T-shaped hollow nozzle having four hollows in one yarn were used. A three-dimensional reticulated structure was prepared under the above manufacturing conditions so that the supplied nitrogen gas pressure was 0.01 kg / cm 2 , the resin discharge rate was 24 kg / hour, and the outer peripheral length of the filament was 9 mm. Table 1 shows the results of measuring the weight and compression characteristics of the obtained three-dimensional network structure.
【００２４】実施例２ 中空部に供給する窒素ガス圧力０．０６ｋｇ／ｃｍ2 、
樹脂吐出量１６ｋｇ／時とした以外は実施例１と同様な
製造条件において立体網状構造体を作成した。得られた
立体網状構造体の重量、圧縮特性を測定した結果を表１
に示す。Example 2 The pressure of nitrogen gas supplied to the hollow portion was 0.06 kg / cm 2 ,
A three-dimensional network structure was produced under the same manufacturing conditions as in Example 1 except that the resin discharge rate was 16 kg / hour. The results of measuring the weight and compression characteristics of the obtained three-dimensional network structure are shown in Table 1.
Shown in.
【００２５】実施例３ 中空部に供給する窒素ガス圧力０．２ｋｇ／ｃｍ2 、樹
脂吐出量８ｋｇ／時として以外は実施例１と同様な製造
条件において立体網状構造体を作成した。得られた立体
網状構造体の重量、圧縮特性を測定した結果を表１に示
す。Example 3 A three-dimensional network structure was prepared under the same manufacturing conditions as in Example 1 except that the pressure of nitrogen gas supplied to the hollow portion was 0.2 kg / cm 2 and the resin discharge rate was 8 kg / hour. Table 1 shows the results of measuring the weight and compression characteristics of the obtained three-dimensional network structure.
【００２６】実施例４ ポリエチレンテレフタレート（以下ＰＥＴという）製飲
料水容器を使用後に回収し、粉砕したポリエステル再生
樹脂を７０重量％、実施例１で用いたポリプロピレン３
０重量％を用い、上記押出機のシリンダー温度を２７５
℃に設定し、毎時２０ｋｇの吐出量にした以外は実施例
２と同様な製造条件において立体網状構造体を作成し
た。得られた立体網状構造体の圧縮特性を測定した結果
を表１に示す。Example 4 Polyethylene terephthalate (hereinafter referred to as PET) 70% by weight of polyester recycled resin recovered and crushed after use, polypropylene 3 used in Example 1
0% by weight, the cylinder temperature of the extruder is 275
A three-dimensional reticulated structure was prepared under the same manufacturing conditions as in Example 2 except that the temperature was set to 0 ° C. and the discharge rate was 20 kg per hour. The results of measuring the compression characteristics of the obtained three-dimensional network structure are shown in Table 1.
【００２７】比較例１ 田字形中空用ノズルの替わりに、１辺１．５ｍｍの中空
でない５０穴のノズル群から毎時２５ｋｇにて紡出し、
窒素ガスを用いない以外は実施例１と同様に２３０℃の
メルトインデックスが８ｇ／１０分のポリプロピレンを
用いて立体網状構造体を作成した。その結果を表１に示
す。COMPARATIVE EXAMPLE 1 Instead of the double-sided hollow nozzle, spinning was carried out at a rate of 25 kg per hour from a non-hollow 50-hole nozzle group having a side of 1.5 mm.
In the same manner as in Example 1 except that nitrogen gas was not used, a three-dimensional network structure was prepared using polypropylene having a melt index of 8 g / 10 min at 230 ° C. The results are shown in Table 1.
【００２８】比較例２ 田字形中空用ノズルの替わりに、外径１．５ｍｍの丸状
中空ノズルを用い、樹脂吐出量１６ｋｇ／時、外周長９
ｍｍとなるように調節した以外は実施例２と同様に２３
０℃のメルトインデックスが８ｇ／１０分のポリプロピ
レンを用いて立体網状構造体を作成した。その結果を表
１に示す。COMPARATIVE EXAMPLE 2 A circular hollow nozzle having an outer diameter of 1.5 mm was used in place of the dog-shaped hollow nozzle, the resin discharge rate was 16 kg / hr, and the outer peripheral length was 9
23 as in Example 2 except that the adjustment was made to be mm.
A three-dimensional network structure was prepared by using polypropylene having a melt index of 0 ° C. of 8 g / 10 min. The results are shown in Table 1.
【００２９】比較例３ 中空部に供給する窒素ガス圧力０．３ｋｇ／ｃｍ2 、樹
脂吐出量４ｋｇ／時とした以外は実施例１と同様な製造
条件において立体網状構造体を作成した。得られた立体
網状構造体の重量、圧縮特性を表１に示す。Comparative Example 3 A three-dimensional net-like structure was prepared under the same manufacturing conditions as in Example 1 except that the pressure of nitrogen gas supplied to the hollow portion was 0.3 kg / cm 2 and the resin discharge rate was 4 kg / hour. Table 1 shows the weight and compression characteristics of the obtained three-dimensional network structure.
【００３０】[0030]
【表１】 [Table 1]
【００３１】実施例１は、本発明の要件を満足するもの
の中空率が低いため歪２０％時の圧縮強度は低かった
が、歪５０％時の圧縮強度は単糸が異形断面であるた
め、高い値を示す。実施例２〜４は、歪２０％、５０％
時の何れにおいても優れていた。特に実施例３は軽量化
に優れるとともに圧縮強度にも優れていた。比較例１は
中実であるため軽量化にほど遠いものであった。比較例
２は、歪２０％時に高い圧縮強度を示していたが、歪５
０％時に圧縮強度が低くなった。これは、単糸の断面が
ドーナツ状の中空のため各実施例に比べて単糸の圧縮強
度が低く、大きな応力時には単糸が先に破壊するため高
い圧縮強度が得られないためと考えられる。比較例３
は、逆に中空率が大きすぎるために、軽量化されてはい
るものの、圧縮強度が小さすぎて使用に耐えなかった。In Example 1, although the requirements of the present invention were satisfied, the compressive strength at a strain of 20% was low because the hollow ratio was low, but the compressive strength at a strain of 50% was because the single yarn had an irregular cross section. It shows a high value. Examples 2 to 4 have strains of 20% and 50%.
It was excellent at all times. In particular, Example 3 was excellent in weight reduction and also in compressive strength. Since Comparative Example 1 was solid, it was far from being lightweight. Comparative Example 2 showed high compressive strength at 20% strain, but strain 5
The compressive strength became low at 0%. It is considered that this is because the single yarn has a lower dough-like compressive strength due to the doughnut-shaped cross-section, and the single yarn breaks first when a large stress is applied, so that high compressive strength cannot be obtained. . Comparative Example 3
On the other hand, although the hollow ratio was too large, the product was lightened, but the compressive strength was too small to be used.
【００３２】[0032]
【発明の効果】本発明の立体網状構造体は上記のような
構成を有しており、軽量であっても圧縮強度が高く、へ
たりにくいため、軟弱地盤、液状化地盤の排水材の基
材、盛土補強用材などの土木資材、寝具、家具、車両な
どに用いられるクッション材などに好適であり、計量化
により、輸送、搬入、現場での作業性を改善、効率化に
役立つものである。EFFECTS OF THE INVENTION The three-dimensional network structure of the present invention has the above-mentioned structure, and since it has a high compressive strength even when it is lightweight and is hard to settle, it is the basis of the drainage material for soft ground and liquefied ground. Suitable for materials, civil engineering materials such as embankment reinforcement materials, bedding, furniture, cushioning materials used for vehicles, etc., and by weighing, it is useful for improving workability in transportation, carrying in, and on site, and improving efficiency. .
Claims (3)
プを形成してなる立体網状構造体において、前記線条の
外周長が０．３〜１５ｍｍの範囲にあり、該線条が異形
断面をなし、且つ該線条が中空率５〜８０％の中空部を
有し、該線条が相互に接着していることを特徴とする立
体網状構造体。1. A three-dimensional network structure in which a large number of thermoplastic resin filaments form a loop, wherein the filaments have an outer peripheral length in the range of 0.3 to 15 mm, and the filaments have an irregular cross section. And the filament has a hollow portion with a hollow ratio of 5 to 80%, and the filament is adhered to each other.
５０重量％以上含む請求項１に記載の立体網状構造体。2. The three-dimensional network structure according to claim 1, wherein the thermoplastic resin contains 50% by weight or more of recycled polyester resin.
する請求項１又は２に記載の立体網状構造体。3. The three-dimensional net-like structure according to claim 1, wherein two or more hollow portions are present in the linear cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7495094A JP3589306B2 (en) | 1994-04-13 | 1994-04-13 | Three-dimensional network structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7495094A JP3589306B2 (en) | 1994-04-13 | 1994-04-13 | Three-dimensional network structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07279175A true JPH07279175A (en) | 1995-10-24 |
| JP3589306B2 JP3589306B2 (en) | 2004-11-17 |
Family
ID=13562123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7495094A Expired - Lifetime JP3589306B2 (en) | 1994-04-13 | 1994-04-13 | Three-dimensional network structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3589306B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183972A (en) * | 2001-12-17 | 2003-07-03 | Toyobo Co Ltd | Three-dimensional net structure |
| JP2014177777A (en) * | 2013-03-14 | 2014-09-25 | Railway Technical Research Institute | Tree planting method of earthquake resistant tide embankment banking slope face |
| JP2017160553A (en) * | 2016-03-08 | 2017-09-14 | 株式会社エアウィーヴマニュファクチャリング | Apparatus for manufacturing filament three-dimensional conjugate and filament three-dimensional conjugate |
-
1994
- 1994-04-13 JP JP7495094A patent/JP3589306B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003183972A (en) * | 2001-12-17 | 2003-07-03 | Toyobo Co Ltd | Three-dimensional net structure |
| JP2014177777A (en) * | 2013-03-14 | 2014-09-25 | Railway Technical Research Institute | Tree planting method of earthquake resistant tide embankment banking slope face |
| JP2017160553A (en) * | 2016-03-08 | 2017-09-14 | 株式会社エアウィーヴマニュファクチャリング | Apparatus for manufacturing filament three-dimensional conjugate and filament three-dimensional conjugate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3589306B2 (en) | 2004-11-17 |
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