JPS6328008B2 - - Google Patents
Info
- Publication number
- JPS6328008B2 JPS6328008B2 JP58102855A JP10285583A JPS6328008B2 JP S6328008 B2 JPS6328008 B2 JP S6328008B2 JP 58102855 A JP58102855 A JP 58102855A JP 10285583 A JP10285583 A JP 10285583A JP S6328008 B2 JPS6328008 B2 JP S6328008B2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- thermoplastic resin
- film
- foam sheet
- resin foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920005992 thermoplastic resin Polymers 0.000 claims description 50
- 239000006260 foam Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 9
- 239000004088 foaming agent Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000004604 Blowing Agent Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 239000002667 nucleating agent Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- DDMOUSALMHHKOS-UHFFFAOYSA-N 1,2-dichloro-1,1,2,2-tetrafluoroethane Chemical compound FC(F)(Cl)C(F)(F)Cl DDMOUSALMHHKOS-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229910052570 clay Inorganic materials 0.000 description 2
- 229940087091 dichlorotetrafluoroethane Drugs 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 2
- 229940029284 trichlorofluoromethane Drugs 0.000 description 2
- BOSAWIQFTJIYIS-UHFFFAOYSA-N 1,1,1-trichloro-2,2,2-trifluoroethane Chemical compound FC(F)(F)C(Cl)(Cl)Cl BOSAWIQFTJIYIS-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- UMNKXPULIDJLSU-UHFFFAOYSA-N dichlorofluoromethane Chemical compound FC(Cl)Cl UMNKXPULIDJLSU-UHFFFAOYSA-N 0.000 description 1
- 229940099364 dichlorofluoromethane Drugs 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/56—After-treatment of articles, e.g. for altering the shape
- B29C44/5627—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching
- B29C44/5636—After-treatment of articles, e.g. for altering the shape by mechanical deformation, e.g. crushing, embossing, stretching with the addition of heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
- B29C44/507—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through an annular die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/001—Tubular films, sleeves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molding Of Porous Articles (AREA)
- Packaging Frangible Articles (AREA)
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
【発明の詳細な説明】
本発明は熱可塑性樹脂製筒状体およびその製造
方法に関し、とりわけその断面形状に特色を有す
る熱可塑性樹脂製筒状体と、この筒状体を効率よ
く製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical body made of thermoplastic resin and a method for manufacturing the same, and more particularly to a cylindrical body made of thermoplastic resin having a distinctive cross-sectional shape, and a method for efficiently manufacturing this cylindrical body. Regarding.
熱可塑性樹脂を発泡成形してなる熱可塑性樹脂
製筒状体は、各種配管類の断熱材料や蛍光灯など
の包装材料等として用いられている。 Thermoplastic resin cylindrical bodies formed by foam-molding thermoplastic resin are used as insulation materials for various types of piping, packaging materials for fluorescent lamps, and the like.
これら熱可塑性樹脂製筒状体は、溶融した熱可
塑性樹脂と発泡剤とを加圧下混合し、環状ダイよ
り押出し、発泡させながら賦形ダイを用いて製造
されており、一定の内、外径を有するものでる。
したがつて、各種配管の保温工事等においては、
その配管の外径に応じて各種サイズの筒状体を必
要としており、使用上の自由度が低いという欠点
があつた。 These thermoplastic resin cylindrical bodies are manufactured by mixing molten thermoplastic resin and a foaming agent under pressure, extruding the mixture from an annular die, and using a shaping die while foaming. There are some that have this.
Therefore, in heat insulation work for various piping, etc.
This method requires cylindrical bodies of various sizes depending on the outer diameter of the piping, and has the drawback of low flexibility in use.
しかも、この筒状体は上記のようにして製造さ
れているため、高発泡倍率のものは得られなかつ
た。 Furthermore, since this cylindrical body was manufactured in the manner described above, it was not possible to obtain one with a high expansion ratio.
本発明者らは上記従来の欠点を解消するため鋭
意研究を重ねた。その結果、熱可塑性樹脂製筒状
体の断面形状を特定形状にしたものが、広範囲の
配管径に適用でき、しかも高発泡倍率とすること
ができることを見出すとともに、この筒状体を効
率よく製造する方法を見出し、本発明を完成する
に到つた。 The present inventors have conducted extensive research in order to eliminate the above-mentioned conventional drawbacks. As a result, we found that a thermoplastic resin cylindrical body with a specific cross-sectional shape can be applied to a wide range of pipe diameters and can have a high expansion ratio.We also found that this cylindrical body could be manufactured efficiently. They found a method to do this and completed the present invention.
すなわち本発明は、第１に、熱可塑性樹脂発泡
シートまたはフイルムよりなる筒状体であつて、
該筒状体の断面形状が、前記熱可塑性樹脂発泡シ
ートまたはフイルムが円周方向に連続的に折りた
たまれた形状を有しており、かつ該折りたたみ面
が融着しているものである熱可塑性樹脂製筒状体
提供するものであり、第２に溶融した熱可塑性樹
脂と発泡剤とを加圧下混合して環状ダイより押出
し、熱可塑性樹脂発泡シートまたはフイルムより
なる筒状体を形成しながら該筒状体内部の気体を
筒状体外部に除去して該筒状体の断面形状を前記
熱可塑性樹脂発泡シートまたはフイルムが円周方
向に連続的に折りたたまれた形状を有しており、
かつ該折りたたみ面が融着しているものとするこ
とを特徴とする熱可塑性樹脂製筒状体を提供する
ものである。 That is, the present invention firstly provides a cylindrical body made of a thermoplastic resin foam sheet or film,
A thermoplastic material in which the cylindrical body has a cross-sectional shape in which the thermoplastic resin foam sheet or film is continuously folded in the circumferential direction, and the folded surfaces are fused. Second, a molten thermoplastic resin and a foaming agent are mixed under pressure and extruded through an annular die to form a cylindrical body made of a thermoplastic resin foam sheet or film. removing the gas inside the cylindrical body to the outside of the cylindrical body so that the cross-sectional shape of the cylindrical body has a shape in which the thermoplastic resin foam sheet or film is continuously folded in the circumferential direction;
The present invention also provides a thermoplastic resin cylindrical body characterized in that the folded surfaces are fused.
以下、まず本発明の第１について説明する。 Hereinafter, the first aspect of the present invention will be explained first.
本発明の第１の熱可塑性樹脂製筒状体は熱可塑
性樹脂発泡シートまたはフイルムよりなるもので
ある。ここでこの熱可塑性樹脂発泡シートまたは
フイルムの原料となる熱可塑性樹脂としては特に
制限はなく様々なものが挙げられる。例えばポリ
エチレン、ポリプロピレン等のポリオレフイン；
エチレン、プロピレン等のオレフインと他の共重
合成分との共重合体；ポリスチレン；スチレンと
他の共重合成分との共重合体；ポリ塩化ビニル；
ポリアミド；ポリエステル；ポリアセタールなど
あるいはこれらの混合物が挙げられる。 The first thermoplastic resin cylindrical body of the present invention is made of a thermoplastic resin foam sheet or film. The thermoplastic resin used as the raw material for this thermoplastic resin foam sheet or film is not particularly limited, and various resins may be used. For example, polyolefins such as polyethylene and polypropylene;
Copolymers of olefins such as ethylene and propylene and other copolymer components; Polystyrene; Copolymers of styrene and other copolymer components; Polyvinyl chloride;
Examples include polyamide; polyester; polyacetal; and mixtures thereof.
さらに、上記熱可塑性樹脂を発泡させる発泡剤
としては特に制限はないが、例えばいわゆる揮発
性発泡剤、プロパン、プタン、ペンタン、ヘキサ
ン等の脂肪族炭化水素；トリクロロモノフルオロ
メタン、ジクロロテトラフルオロエタン、ジクロ
ロモノフルオロメタン、トリクロロトリフルオロ
エタン等の弗化塩化炭化水素；メタノール、エタ
ノール等のアルコール類；水あるいはこれらの混
合物などが挙げられる。 Furthermore, there are no particular restrictions on the blowing agent for foaming the thermoplastic resin, but examples include so-called volatile blowing agents, aliphatic hydrocarbons such as propane, butane, pentane, and hexane; trichloromonofluoromethane, dichlorotetrafluoroethane, Examples include fluorinated chlorinated hydrocarbons such as dichloromonofluoromethane and trichlorotrifluoroethane; alcohols such as methanol and ethanol; water and mixtures thereof.
通常、溶融した上記熱可塑性樹脂と発泡剤とを
加圧下混合し、環状ダイより押出して熱可塑性樹
脂発泡シートまたはフイルムよりなる筒状体を形
成することができる。 Usually, the molten thermoplastic resin and a blowing agent are mixed under pressure and extruded from an annular die to form a cylindrical body made of a thermoplastic resin foam sheet or film.
本発明の第１の熱可塑性樹脂製筒状体はこのよ
うな筒状体であつて、しかもその断面形状が第１
図に示したように、熱可塑性樹脂発泡シートまた
はフイルム１が円周方向に連続的に折りたたまれ
た形状を有するものである。なお、このように連
続的に折りたたむことにより形成される折りたた
み面２は融着している。また、この折りたたみ面
２のピツチｐや高さｌは特に制限はない。 The first thermoplastic resin cylindrical body of the present invention is such a cylindrical body, and furthermore, its cross-sectional shape is the first thermoplastic resin cylindrical body.
As shown in the figure, the thermoplastic resin foam sheet or film 1 has a shape that is continuously folded in the circumferential direction. Note that the folding surface 2 formed by continuous folding in this manner is fused. Further, the pitch p and height l of this folding surface 2 are not particularly limited.
次に、本発明の第２は上記本発明の第１の熱可
塑性樹脂製筒状体を効率よく製造する方法に関す
るものである。 Next, the second aspect of the present invention relates to a method for efficiently manufacturing the thermoplastic resin cylindrical body according to the first aspect of the present invention.
本発明においてはまず溶融した熱可塑性樹脂と
発泡剤とを加圧下混合し、環状ダイより押出して
熱可塑性樹脂発泡シートまたはフイルムよりなる
筒状体を形成する。 In the present invention, first, a molten thermoplastic resin and a blowing agent are mixed under pressure and extruded from an annular die to form a cylindrical body made of a thermoplastic resin foam sheet or film.
ここで熱可塑性樹脂および発泡剤としては上記
したものが挙げられる。 Here, the thermoplastic resin and blowing agent include those mentioned above.
これら熱可塑性樹脂と発泡剤との配合割合は、
通常前者100重量部に対し、後者５〜200重量部、
好ましくは50〜150重量部である。なお、発泡剤
として揮発性発泡剤を用いる場合、通常10〜200
Kg／cm2の圧力で熱可塑性樹脂中に圧入することが
望ましい。 The blending ratio of these thermoplastic resins and blowing agents is as follows:
Usually 100 parts by weight of the former, 5 to 200 parts by weight of the latter,
Preferably it is 50 to 150 parts by weight. In addition, when using a volatile foaming agent as a foaming agent, it is usually 10 to 200
It is desirable to press it into the thermoplastic resin at a pressure of Kg/cm 2 .
溶融した熱可塑性樹脂と発泡剤とは押出成形機
等の成形機を用いて加圧下において十分に混練さ
れる。ここで成形機内の圧力は発泡剤の樹脂との
発泡溶解を促進する上で、また成形機内での発泡
を防止する上でも十分に高いことが望ましい。 The molten thermoplastic resin and the blowing agent are sufficiently kneaded under pressure using a molding machine such as an extrusion molding machine. Here, the pressure inside the molding machine is desirably high enough to promote foaming and dissolution of the foaming agent with the resin and to prevent foaming within the molding machine.
なお、これらは混練しながら、樹脂の融点また
は軟化点に対して、−45℃〜＋10℃程度に冷却し
ておくことが好ましい。 In addition, while kneading these, it is preferable to cool them to about -45°C to +10°C with respect to the melting point or softening point of the resin.
次いで、環状ダイより大気中に押出して発泡さ
せ、熱可塑性樹脂シートまたはフイルムよりなる
筒状体を形成する。 Next, it is extruded into the atmosphere through an annular die and foamed to form a cylindrical body made of a thermoplastic resin sheet or film.
なお、本発明においては必要によりタルク、ク
レー、シリカ等の気泡核形成剤を適宜加えること
もできる。この気泡核形成剤の添加量は通常熱可
塑性樹脂100重量部に対し、５重量部以下である。
この気泡核形成剤の使用により気泡を均一にする
ことができるとともに気泡径を小さくすることが
でき、発泡剤を有効に利用することができる。 In addition, in the present invention, a bubble nucleating agent such as talc, clay, or silica may be appropriately added if necessary. The amount of the cell nucleating agent added is usually 5 parts by weight or less per 100 parts by weight of the thermoplastic resin.
By using this bubble nucleating agent, the bubbles can be made uniform and the diameter of the bubbles can be reduced, allowing effective use of the blowing agent.
また、熱可塑性樹脂には必要により各種安定剤
（酸化、熱、光など）、充填材（炭酸カルシウム、
タルク、クレー、カーボンブラツクなど）、ゴム
類、帯電防止剤、可塑剤、着色剤などを適宜加え
ることができる。 In addition, various stabilizers (oxidation, heat, light, etc.) and fillers (calcium carbonate,
talc, clay, carbon black, etc.), rubbers, antistatic agents, plasticizers, colorants, etc. can be added as appropriate.
上記の如く熱可塑性樹脂シートまたはフイルム
よりなる筒状体を形成しながら、該筒状体内部の
気体、とりわけ発泡剤ガスを筒状体外部に除去す
る。該筒状体内部の気体の除去は環状ダイより行
なつてもよく、あるいは該筒状体の一部を切り開
き直接行なつてもよい。なお、環状ダイよりの気
体の除去は例えば環状ダイ内に筒状体内部と連通
する気体除去管等を設け、必要によりポンプ等に
より筒状体内部の気体を吸引することにより行な
うことができる。ここで筒状体内部は大気圧もし
くはそれ以下にすることが必要であり、気体の除
去を行なわないと、大口径の通常の筒状発泡体が
得られ、本発明の目的を達成することができな
い。 While forming a cylindrical body made of a thermoplastic resin sheet or film as described above, the gas inside the cylindrical body, particularly the blowing agent gas, is removed to the outside of the cylindrical body. The gas inside the cylindrical body may be removed using an annular die, or may be removed directly by cutting open a part of the cylindrical body. Note that gas can be removed from the annular die by, for example, providing a gas removal tube or the like in the annular die that communicates with the inside of the cylindrical body, and if necessary, sucking the gas inside the cylindrical body using a pump or the like. Here, the inside of the cylindrical body needs to be at atmospheric pressure or lower, and if the gas is not removed, a normal cylindrical foam with a large diameter will be obtained, and the object of the present invention cannot be achieved. Can not.
また、筒状体内部の気体の除去は連続的に行な
つてもよく、あるいは間歇的に行なつてもよい。 Further, the gas inside the cylindrical body may be removed continuously or intermittently.
以上の操作により、その断面形状が、熱可塑性
樹脂発泡シートまたはフイルムが円周方向に連続
的に折りたたまれた形状を有する熱可塑性樹脂製
筒状体を製造することができる。 By the above operations, it is possible to manufacture a thermoplastic resin cylindrical body whose cross-sectional shape is a shape in which a thermoplastic resin foam sheet or film is continuously folded in the circumferential direction.
このようにして製造される筒状体は折りたたみ
面すなわち表皮がゆるやかに融着している。 The cylindrical body manufactured in this manner has a folded surface, that is, a skin that is gently fused together.
なお、環状ダイのリツプ間隙を大きくすること
により折りたたみ面２のピツチｐを小さくするこ
とができ、また逆にリツプ間隙を大きくすること
によりピツチを大きくすることができる。 Incidentally, by increasing the lip gap of the annular die, the pitch p of the folding surface 2 can be decreased, and conversely, by increasing the lip gap, the pitch can be increased.
また、発泡倍率を大きくした場合、折りたたみ
面２の高さｌが大きいものが得られ、また発泡倍
率を小さくした場合、高さｌの小さいものが得ら
れる。したがつて、発泡倍率を大きくして30倍以
上とすることにより、折りたたみ面２の高さｌが
大きく、断熱性能にすぐれたものとなる。 Moreover, when the foaming ratio is increased, a product with a large height l of the folding surface 2 is obtained, and when the foaming ratio is reduced, a product with a small height l is obtained. Therefore, by increasing the foaming ratio to 30 times or more, the height l of the folding surface 2 becomes large and the insulation performance becomes excellent.
なお、本発明においては筒状体の押出速度は最
大100〜150ｍ／minまで可能であるが、押出速度
を速くした場合、押りたたみ面２のピツチｐの小
さいものが得られ、また押出速度を遅くした場
合、押りたたみ面２のピツチｐの大きいものが得
られる。 In addition, in the present invention, the extrusion speed of the cylindrical body can be up to 100 to 150 m/min, but when the extrusion speed is increased, the pitch p of the folding surface 2 is small, and the extrusion speed is also increased. If it is slowed down, a large pitch p of the folding surface 2 can be obtained.
以上説明したように、第１の本発明による筒状
体は、その断面形状が、熱可塑性樹脂発泡シート
またはフイルムが円周方向に連続的に折りたたま
れた形状を有するものである。したがつて、径の
伸張が可能であつて、広範囲の外径を有する配管
等に適用しうるものである。 As explained above, the cylindrical body according to the first aspect of the present invention has a cross-sectional shape in which a thermoplastic resin foam sheet or film is continuously folded in the circumferential direction. Therefore, the diameter can be expanded, and it can be applied to piping and the like having a wide range of outside diameters.
さらに、従来の方法では発泡倍率は通常30倍未
満に制限されており、高発泡倍率のものは製造す
ることができなかつたが、本発明の方法によれば
30〜150倍という高発泡倍率の発泡体を製造する
ことができ、断熱性能のすぐれた筒状体を製造す
ることができる。 Furthermore, with conventional methods, the expansion ratio is usually limited to less than 30 times, making it impossible to produce products with high expansion ratios, but with the method of the present invention,
A foam with a high expansion ratio of 30 to 150 times can be produced, and a cylindrical body with excellent heat insulation performance can be produced.
また、本発明の方法によれば径の伸張が可能な
筒状体を得ることができるので、各種サイズの配
管径に対応した押出ダイを揃えておく必要がな
い。また、環状ダイのリツプ間隙を変更したり、
あるいはダイからの押出速度を変更することなど
により、実質的に設備を変えることなく、形状の
異なつた筒状体を得ることができる。さらには、
賦形ダイも不要であるとともに冷却装置も不要と
なり、設備費を大巾に低減化することができる。 Further, according to the method of the present invention, it is possible to obtain a cylindrical body whose diameter can be expanded, so there is no need to prepare extrusion dies corresponding to various pipe diameters. In addition, the lip gap of the annular die can be changed,
Alternatively, by changing the extrusion speed from the die, cylindrical bodies of different shapes can be obtained without substantially changing the equipment. Furthermore,
A shaping die is not required, and a cooling device is also not required, making it possible to significantly reduce equipment costs.
しかも、本発明の方法によれば、小口径ダイで
大口径の発泡体が得られるとともに、連続かつ高
速生産が可能である。 Moreover, according to the method of the present invention, a large-diameter foam can be obtained using a small-diameter die, and continuous and high-speed production is possible.
したがつて、本発明の方法によれば安価に熱可
塑性樹脂製筒状体を製造することができる。 Therefore, according to the method of the present invention, a thermoplastic resin cylindrical body can be manufactured at low cost.
本発明で得られた熱可塑性樹脂製筒状体は、筒
状であること、樹脂発泡体で形成されているた
め、断熱性、緩衝性を有する特徴に加えて、折り
たたみ構造の引き伸ばしにより径が容易に拡大す
ること、熱可塑性樹脂の弾性特性により元の状態
に戻ろうとする収縮性を有している。 The thermoplastic resin cylindrical body obtained in the present invention has a cylindrical shape and is made of resin foam, so in addition to having heat insulating and cushioning properties, the diameter can be increased by stretching the folded structure. It expands easily and has the ability to shrink back to its original state due to the elastic properties of thermoplastic resin.
従つて、この筒状体のままで各種配管類の断熱
材料として用いたり、蛍光灯などの筒状物品の緩
衝包装材料として用いることができる。 Therefore, this cylindrical body can be used as it is as a heat insulating material for various types of piping, or as a cushioning packaging material for cylindrical articles such as fluorescent lamps.
さらに必要により、この筒状体を切り開いて板
状体とし、従来得られなかつた高発泡倍率で厚み
のある、たとえば数cmの板状発泡体として各種用
途に使用できる。 Furthermore, if necessary, this cylindrical body can be cut open to form a plate-shaped body, which can be used for various purposes as a plate-shaped foam with a high expansion ratio and thickness, for example, several centimeters, which has not been previously available.
次に本発明を実施例により説明する。 Next, the present invention will be explained by examples.
実施例
押出成形機を用いて200℃に溶融したポリプロ
ピレン（密度0.91ｇ／cm3、メルトインデツクス
0.6ｇ／10分）100重量部に対して、トリクロロモ
ノフルオロメタン81重量部およびジクロロテトラ
フルオロエタン９重量部を150Kg／cm2で圧入し、
十分に混練しつつ135℃まで冷却し、サーキユラ
ーダイ（ダイス径30mmφ）より大気中へ押出し
た。押出された筒状体は急激に発泡したが、筒状
体内部の発泡剤ガスを連続的に除去することによ
り、第１図に示す断面形状を有する熱可塑性樹脂
製筒状体を得た。Example Polypropylene (density 0.91 g/cm 3 , melt index) melted at 200°C using an extruder
0.6g/10 minutes) 81 parts by weight of trichloromonofluoromethane and 9 parts by weight of dichlorotetrafluoroethane were press-fitted at 150Kg/cm 2 into 100 parts by weight,
The mixture was thoroughly kneaded and cooled to 135°C, and extruded into the atmosphere through a circular die (die diameter: 30 mmφ). Although the extruded cylindrical body rapidly foamed, by continuously removing the foaming agent gas inside the cylindrical body, a thermoplastic resin cylindrical body having the cross-sectional shape shown in FIG. 1 was obtained.
この筒状体は、表皮でゆるやかに融着してお
り、24時間空気中で養生した後の発泡倍率は85倍
であり、内径40mmφ、外径60mmφ、折りたたまれ
た熱可塑性樹脂発泡シートの厚みは約2.5mmであ
つた。 This cylindrical body is loosely fused with the skin, and has a foaming ratio of 85 times after curing in air for 24 hours, with an inner diameter of 40 mmφ, an outer diameter of 60 mmφ, and a thickness of the folded thermoplastic resin foam sheet. was approximately 2.5 mm.
第１図は本発明による熱可塑性樹脂製筒状体の
断面図である。
１……熱可塑性樹脂発泡シートまたはフイル
ム、２……折りたたみ面、ｐ……折りたたみ面の
ピツチ、ｌ……折りたたみ面の高さ。
FIG. 1 is a sectional view of a cylindrical body made of thermoplastic resin according to the present invention. 1...Thermoplastic resin foam sheet or film, 2...Folding surface, p...Pitch of folding surface, l...Height of folding surface.
Claims (1)
なる筒状体であつて、該筒状体の断面形状が、前
記熱可塑性樹脂発泡シートまたはフイルムが円周
方向に連続的に折りたたまれた形状を有してお
り、かつ該折りたたみ面が融着しているものであ
る熱可塑性樹脂製筒状体。 ２ 溶融した熱可塑性樹脂と発泡剤とを加圧下混
合して環状ダイより押出し、熱可塑性樹脂発泡シ
ートまたはフイルムよりなる筒状体を形成しなが
ら、該筒状体内部の気体を筒状体外部に除去して
該筒状体の断面形状を前記熱可塑性樹脂発泡シー
トまたはフイルムが円周方向に連続的に折りたた
まれた形状を有しており、かつ該折りたたみ面が
融着しているものとすることを特徴とする熱可塑
性樹脂製筒状体を製造する方法。 ３ 発泡倍率が30倍以上である特許請求の範囲第
２項記載の方法。[Scope of Claims] 1. A cylindrical body made of a thermoplastic resin foam sheet or film, wherein the cross-sectional shape of the cylindrical body is such that the thermoplastic resin foam sheet or film is continuously folded in the circumferential direction. 1. A cylindrical body made of thermoplastic resin, which has a cylindrical shape and whose folded surfaces are fused. 2 Melted thermoplastic resin and foaming agent are mixed under pressure and extruded through an annular die to form a cylindrical body made of a thermoplastic resin foam sheet or film, while the gas inside the cylindrical body is expelled from the outside of the cylindrical body. and the cross-sectional shape of the cylindrical body is such that the thermoplastic resin foam sheet or film is continuously folded in the circumferential direction, and the folded surfaces are fused. A method for manufacturing a thermoplastic resin cylindrical body, characterized by: 3. The method according to claim 2, wherein the foaming ratio is 30 times or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58102855A JPS59227427A (en) | 1983-06-10 | 1983-06-10 | Cylinder made of thermoplastic resin and preparation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58102855A JPS59227427A (en) | 1983-06-10 | 1983-06-10 | Cylinder made of thermoplastic resin and preparation thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59227427A JPS59227427A (en) | 1984-12-20 |
| JPS6328008B2 true JPS6328008B2 (en) | 1988-06-07 |
Family
ID=14338535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58102855A Granted JPS59227427A (en) | 1983-06-10 | 1983-06-10 | Cylinder made of thermoplastic resin and preparation thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59227427A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55306B2 (en) * | 1974-10-28 | 1980-01-07 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS609174Y2 (en) * | 1978-04-18 | 1985-04-02 | 積水化成品工業株式会社 | Buffer sheet |
-
1983
- 1983-06-10 JP JP58102855A patent/JPS59227427A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55306B2 (en) * | 1974-10-28 | 1980-01-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59227427A (en) | 1984-12-20 |
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