JPS6324810B2 - - Google Patents
Info
- Publication number
- JPS6324810B2 JPS6324810B2 JP58149298A JP14929883A JPS6324810B2 JP S6324810 B2 JPS6324810 B2 JP S6324810B2 JP 58149298 A JP58149298 A JP 58149298A JP 14929883 A JP14929883 A JP 14929883A JP S6324810 B2 JPS6324810 B2 JP S6324810B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- inner diameter
- cylindrical foam
- take
- diameter
- 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
- 239000006260 foam Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 11
- 229920005992 thermoplastic resin Polymers 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- 238000011088 calibration curve Methods 0.000 description 8
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 8
- 239000004604 Blowing Agent Substances 0.000 description 7
- 239000001273 butane Substances 0.000 description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000005187 foaming Methods 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- -1 ethylene, propylene, 1-butene Chemical class 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene 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
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- HWPKGOGLCKPRLZ-UHFFFAOYSA-M monosodium citrate Chemical compound [Na+].OC(=O)CC(O)(C([O-])=O)CC(O)=O HWPKGOGLCKPRLZ-UHFFFAOYSA-M 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- OQUFOZNPBIIJTN-UHFFFAOYSA-N 2-hydroxypropane-1,2,3-tricarboxylic acid;sodium Chemical compound [Na].OC(=O)CC(O)(C(O)=O)CC(O)=O OQUFOZNPBIIJTN-UHFFFAOYSA-N 0.000 description 1
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- SYWIXHZXHQDFOO-UHFFFAOYSA-N methyl n-phenyliminocarbamate Chemical compound COC(=O)N=NC1=CC=CC=C1 SYWIXHZXHQDFOO-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 235000018342 monosodium citrate Nutrition 0.000 description 1
- 239000002524 monosodium citrate Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Substances 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
- B29C44/36—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
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/355—Conveyors for extruded articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92619—Diameter or circumference
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92933—Conveying, transporting or storage of articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molding Of Porous Articles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
本発明は熱可塑性樹脂筒状発泡体の内径および
外径のコントロール法に関し、更に詳しくは、同
一ダイを用いた押出機により熱可塑性樹脂筒状発
泡体を製造するに際して、筒状発泡体の内径は同
一で外径のみを異ならしめるよう内径、外径のコ
ントロールを行なう方法に関する。
熱可塑性樹脂筒状発泡体は、熱媒、冷媒等の供
給パイプあるいは水道管等の断熱、保温用等とし
て広く用いられている。この種の筒状発泡体は発
泡剤を含有する熱可塑性樹脂を所定の径のダイを
取付けた押出機より押出発泡せしめて製造されて
いるが、同一内径で外径のみの異なる筒状発泡体
が要求される場合があり、従来はそのたびに径の
異なるダイに取り換えて発泡を行なつておりダイ
の交換作業に手間がかかるという欠点があつた。
本発明者らは上記欠点を解消すべく鋭意研究し
た結果、筒状発泡体の内径が従来知られていたよ
うに引取速度の増大とともに単に減少するのでは
なく、従来引取が行なわれていた速度以上の速度
で、得られる内径の値に極小値が存在し、それ以
上の引取速度では引取速度の増加とともに外径は
減少する一方内径は徐々に増加するという驚くべ
き事実を見い出し本発明を完成するに至つた。
即ち本発明は熱可塑性樹脂筒状発泡体を押出機
より押出し製造する方法において、一定大きさの
ダイによつて形成される筒状発泡体の引取速度の
増加により直線状に減少する外径の数値変化を求
め且つ引取速度の増加により最初減少し極小値を
通過後増加する内径の数値変化を求め、得られた
各数値変化に基づいて引取速度を変化させること
により筒状発泡体の内径及び外径をコントロール
することを特徴とする熱可塑性樹脂筒状発泡体の
内径及び外径のコントロール法を要旨とする。
本発明において用いられる熱可塑性樹脂として
はエチレン、プロピレン、１−ブテン、１−ペン
テン、４−メチル−１−ペンテン等のα−オレフ
インの単独重合体、またはこれらの共重合体、α
−オレフインとビニル系モノマーとの共重合体、
ポリスチレン、ポリエチレン等の１種または２種
以上の混合物が用いられる。
また上記熱可塑性樹脂の発泡に用いられる発泡
剤としては従来から押出発泡体の製造に用いられ
ている発泡剤であればよく、例えばプロパン、ブ
タン、ペンタン、ヘキサン、ブタジエン、塩化メ
チレン、ジクロロジフロロメタン、トリクロロモ
ノフロロメタン、モノクロロトリフロロメタン等
の揮発性発泡剤、アゾジカルボンアミド、ジニト
ロソペンタメチレンテトラミン、アゾビスイソブ
チロニトリル、Ｐ，P′−オキシビスベンゼンスル
ホニルヒドラジド、アゾエステル等の分解型発泡
剤、窒素、ヘリウム、水素、二酸化炭素、空気等
の無機発泡剤等が挙げられる。
上記樹脂と発泡剤とは通常押出機内で溶融混練
されるが、このとき、気泡調節剤として少量のタ
ルク、シリカ等の無機粉末あるいは多価カルボン
酸の酸性塩、多価カルボン酸と炭酸ナトリウムま
たは重炭酸ナトリウムとの反応混合物等を添加す
ることができ、また必要に応じて熱安定剤、紫外
線吸収剤、酸化防止剤、着色剤等の各種添加剤を
添加することもできる。
本発明においては、発泡剤および必要に応じて
各種添加剤を含有する樹脂を溶融状態で、所定の
径のダイを取付けた押出機内より押出して発泡せ
しめ筒状発泡体を得るに際し、筒状発泡体の引取
速度を、筒状発泡体の内径に極小値を与える引取
速度より遅い速度および速い速度とすることによ
り同一内径で外径のみの異なる筒状発泡体を得る
ことができる。
即ち例えば第１図に検量線で示すように、筒状
発泡体の外径（直線１で示す。）は引取速度が増
加するにつれて順次減少する一方、内径（曲線２
で示す。）は引取速度v0までは引取速度の増加と
ともに減少し、引取速度v0を超えると引取速度の
増加とともに順次増加する。従つて、引取速度v0
よりも小さい引取速度v1で引取りを行なつた際
に、外径L1、内径l1の筒状発泡体を与えるダイと
同一のダイを用いて引取速度v0よりも大きい引取
速度v2で引取りを行なうことによりL1よりも小さ
い外径L2を有し、同一の内径l1の筒状発泡体が得
られる。また同様にして引取速度v1′（v1′＜v0）で
引取りを行なうと外径L1′、内径l1′の筒状発泡体
となるが、この場合も引取速度v2′（v2′＞v0）で引
取を行なうことによりL1′より小さい外径L2′を有
し同一の内径l1′の筒状発泡体が得られる。このよ
うに内径が最小（極小）となる引取速度v0よりも
小さい引取速度v1（v1′）で引取りを行なつたと
き、内径l1（l1′）、外径L1（L1′）の筒状発泡体を与
えるダイを用いて引取速度v0より大なる引取速度
v2（v2′）で引取りを行なうことにより、筒状発泡
体の内径をl1（l1′）、外径をL1（L1′）よりも小さい
L2（L2′）にコントロールすることができ、同一の
ダイにより内径が同一で外径のみ異なる筒状発泡
体を得ることができる。本発明において引取速度
の増加による筒状発泡体の内、外径の数値変化は
例えば検量線を作成して管理することができる
が、これらのプロセスをコンピユーター内で処理
することも、その結果を直接または間接的に引取
速度のコントロールに反映させることもできる。
又、本発明において、引取手段としては引取ロ
ールに捲回しする手段或いは割れ易いものについ
てはパイプ形状に合わせたキヤタピラ式引取手段
等の公知の方法が利用できる。本発明では筒状発
泡体の発泡工程時に樹脂が膨張する際、引取速度
のある範囲においてはその膨張が主に筒の中心方
向に向かつて起こるという物理的現象を見出し、
この物理的現象を巧みに利用することにより筒状
発泡体の内外系をコントロールするものであり、
従つて引取手段の制限を受けない。
以上説明したように本発明によれば、従来の内
径に極小値を与える引取速度以下の速度で引取り
を行なつて得られる内径l1、外径L1の筒状発泡体
に対して、内径に極小値を与える引取速度以上で
引取りを行なうことにより同一径のダイを用いた
場合でも得られる発泡体の内径、外径を、内径
l1、外径L2（L2＜L1）となるようコントロールす
ることができ、同一内径を有し、外径の異なる筒
状発泡体をダイの取換え等の煩雑な作業を要する
ことなく容易に得ることができる。
以下実施例を挙げて本発明を更に詳細に説明す
る。
実施例 １
密度0.918ｇ／cm3、メルトインデツクス0.3
（ｇ／10分）の低密度ポリエチレン100部とクエン
酸モノナトリウム塩1.0部を90mmφの押出機内で
加熱溶融せしめた後、ポリエチレン100部に対し
てブタン５部を加圧注入して混練し、樹脂温度を
102〜104℃に保持しながら、出口の最小径0.5mm
φ、最大径10mmφの環状孔を有するダイより押出
し、予め求めた検量線に基づいて最小内径19mmφ
を与える引取速度9.3ｍ／minよりも遅い引取速
度7.9ｍ／minおよび速い引取速度11.0ｍ／minで
引取り筒状発泡体を得た。この際、引取は引取ロ
ールに捲回す方法で行つた。得られた筒状発泡体
の各引取速度に対する内径、外径および密度を第
１表に示す。
実施例 ２
樹脂100部に対するブタンの加圧注入量を6.5部
とした以外は実施例１と同一組成の樹脂を、最小
径1.7mmφ、最大径10mmφの環状孔を有するダイ
より押出し、予め求めた検量線に基づいて最小内
径25mmφを与える引取速度12.5ｍ／minよりも遅
い引取速度10.7ｍ／minおよび速い引取速度13.8
ｍ／minで引取り、筒状発泡体を得た。この際、
引取は引取ロールに捲回す方法で行なつた。得ら
れた筒状発泡体の各引取速度に対する内径、外径
および密度を第１表に示す。
実施例 ３
樹脂100部に対するブタンの加圧注入量を8.5部
とした以外は実施例１と同一組成の樹脂を、最小
径0.3mmφ、最大径８mmφの環状孔を有するダイ
より押出し、予め求めた検量線に基づいて最小内
径13mmφを与える引取速度16.9ｍ／minよりも遅
い引取速度13.7ｍ／minおよび速い引取速度19.0
ｍ／minで引取り筒状発泡体を得た。この際、引
取は引取ロールに捲回す方法で行つた。得られた
筒状発泡体の各引取速度に対する内径、外径およ
び密度を第１表に示す。
実施例 ４
密度0.922ｇ／cm3、メルトインデツクス0.3ｇ／
10分の直鎖低密度ポリエチレン100部とクエン酸
モノナトリウム塩1.0部を90mmφの押出機内で加
熱溶融せしめた後、直鎖低密度ポリエチレン100
部に対してブタン５部を加圧注入して混練し、樹
脂温度を105〜106℃に保持しながら、出口の最小
径0.5mmφ、最大径10mmφの環状孔を有するダイ
より押出し、予め求めた検量線に基づいて最小内
径21mmφを与える引取速度8.7ｍ／minよりも遅
い引取速度7.5ｍ／minおよび速い引取速度10.4
ｍ／minで引取り筒状発泡体を得た。この際、引
取りは引取りロールに捲回す方法で行つた。得ら
れた筒状発泡体の引取速度に対する内径、外径及
び密度を第１表に併せて示す。
実施例 ５
メルトインデツクス2.0ｇ／10分のポリスチレ
ン100部とクエン酸モノナトリウム塩1.0部を90mm
φの押出機内で加熱溶融せしめた後、ポリスチレ
ン100部に対してブタン５部を加圧注入して混練
し、樹脂温度を118〜120℃に保持しながら出口の
最小径0.5mmφ、最大径10mmφの環状孔を有する
ダイより押出し、予め求めた検量線に基づいて最
小内径18mmφを与える引取速度8.5ｍ／minより
も遅い引取速度7.8ｍ／min及び速い引取速度9.1
ｍ／minで引取り筒状発泡体を得た。この際、引
取りはキヤタピラ式引取方法で行つた。得られた
筒状発泡体の各引取速度に対する内径、外径及び
密度を表に示す。
The present invention relates to a method for controlling the inner diameter and outer diameter of a thermoplastic resin cylindrical foam, and more specifically, when producing a thermoplastic resin cylindrical foam using an extruder using the same die, relates to a method of controlling the inner and outer diameters so that they are the same and only the outer diameter is different. Thermoplastic resin cylindrical foams are widely used for insulation and heat retention of supply pipes for heating medium, refrigerant, etc., water pipes, etc. This type of cylindrical foam is manufactured by extruding and foaming a thermoplastic resin containing a blowing agent using an extruder equipped with a die of a predetermined diameter. Conventionally, foaming has been carried out by replacing the die with a different diameter each time, which has the drawback of requiring time and effort to replace the die. As a result of intensive research by the present inventors to solve the above-mentioned drawbacks, we found that the inner diameter of the cylindrical foam did not simply decrease as the drawing speed increased, as was known in the past, but instead The present invention was completed after discovering the surprising fact that there is a minimum value for the inner diameter obtained at the above speed, and at higher drawing speeds, the outer diameter decreases while the inner diameter gradually increases as the drawing speed increases. I came to the conclusion. That is, the present invention provides a method for extruding thermoplastic resin cylindrical foam from an extruder, in which the outer diameter of the cylindrical foam that is formed by a die of a constant size decreases linearly as the take-up speed increases. The inner diameter of the cylindrical foam and The gist of this paper is a method for controlling the inner diameter and outer diameter of a thermoplastic resin cylindrical foam, which is characterized by controlling the outer diameter. The thermoplastic resin used in the present invention is a homopolymer of α-olefin such as ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, or a copolymer thereof, α
- copolymer of olefin and vinyl monomer,
One or a mixture of two or more of polystyrene, polyethylene, etc. can be used. Further, the blowing agent used for foaming the thermoplastic resin may be any blowing agent conventionally used in the production of extruded foams, such as propane, butane, pentane, hexane, butadiene, methylene chloride, dichlorodifluoride, etc. Decomposition of volatile blowing agents such as methane, trichloromonofluoromethane, and monochlorotrifluoromethane, azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutyronitrile, P,P'-oxybisbenzenesulfonyl hydrazide, azo ester, etc. Examples include mold blowing agents, inorganic blowing agents such as nitrogen, helium, hydrogen, carbon dioxide, and air. The above resin and blowing agent are usually melt-kneaded in an extruder, and at this time, a small amount of inorganic powder such as talc or silica or an acid salt of polyvalent carboxylic acid, polyvalent carboxylic acid and sodium carbonate or A reaction mixture with sodium bicarbonate, etc. can be added, and various additives such as a heat stabilizer, an ultraviolet absorber, an antioxidant, and a coloring agent can also be added as necessary. In the present invention, when obtaining a cylindrical foam by extruding a molten resin containing a foaming agent and various additives as necessary from an extruder equipped with a die of a predetermined diameter, By setting the take-up speed of the body to be slower or faster than the take-up speed that gives the inner diameter of the cylindrical foam a minimum value, it is possible to obtain cylindrical foams having the same inner diameter but different only in outer diameter. For example, as shown in the calibration curve in FIG.
Indicated by ) decreases as the take-up speed increases up to take-up speed v 0 , and increases sequentially as the take-up speed increases beyond take-up speed v 0 . Therefore, the withdrawal speed v 0
Using the same die that gives a cylindrical foam with an outer diameter L 1 and an inner diameter l 1 when taking off at a drawing speed v 1 smaller than , the drawing speed v is greater than the drawing speed v 0 By performing the withdrawal at step 2 , a cylindrical foam having an outer diameter L 2 smaller than L 1 and the same inner diameter l 1 is obtained. Similarly, if the material is drawn at a drawing speed v 1 ′ (v 1 ′<v 0 ), a cylindrical foam having an outer diameter L 1 ′ and an inner diameter l 1 ′ is obtained, but in this case also, the drawing speed is v 2 ′. By performing the withdrawal at (v 2 ′>v 0 ), a cylindrical foam having an outer diameter L 2 ′ smaller than L 1 ′ and the same inner diameter l 1 ′ can be obtained. In this way, when pulling is carried out at a pulling speed v 1 (v 1 ′) lower than the pulling speed v 0 at which the inner diameter is minimum (very small), the inner diameter l 1 (l 1 ′) and the outer diameter L 1 ( Withdrawing speed v greater than 0 using a die giving a cylindrical foam of L 1 ′)
By taking off at v 2 (v 2 ′), the inner diameter of the cylindrical foam is smaller than l 1 (l 1 ′) and the outer diameter is smaller than L 1 (L 1 ′).
L 2 (L 2 ') can be controlled, and cylindrical foams with the same inner diameter and different outer diameter can be obtained using the same die. In the present invention, numerical changes in the inner and outer diameters of the cylindrical foam due to an increase in the take-up speed can be managed by, for example, creating a calibration curve, but these processes can also be processed in a computer or the results can be It can also be reflected directly or indirectly in controlling the withdrawal speed. Further, in the present invention, known methods such as winding on a take-up roll or, for easily breakable materials, a caterpillar type take-off means adapted to the shape of the pipe can be used as the take-up means. In the present invention, we have discovered a physical phenomenon that when resin expands during the foaming process of a cylindrical foam, the expansion mainly occurs toward the center of the cylinder within a certain range of take-up speed,
By skillfully utilizing this physical phenomenon, we can control the internal and external systems of the cylindrical foam.
Therefore, there are no restrictions on collection methods. As explained above, according to the present invention, for a cylindrical foam having an inner diameter l 1 and an outer diameter L 1 obtained by drawing at a speed lower than the conventional drawing speed that gives a minimum value for the inner diameter, The inner diameter and outer diameter of the foam that can be obtained even when using a die of the same diameter by drawing at a drawing speed that gives a minimum value for the inner diameter are defined as the inner diameter.
l 1 , outer diameter L 2 (L 2 < L 1 ), and cylindrical foams with the same inner diameter but different outer diameters require complicated work such as replacing dies. You can easily get it without. The present invention will be explained in more detail with reference to Examples below. Example 1 Density 0.918g/cm 3 , Melt index 0.3
100 parts of low density polyethylene (g/10 minutes) and 1.0 part of monosodium citric acid salt were heated and melted in a 90 mmφ extruder, and then 5 parts of butane was injected under pressure to 100 parts of polyethylene and kneaded. resin temperature
Minimum diameter of outlet 0.5mm while keeping at 102~104℃
φ, extruded through a die with an annular hole with a maximum diameter of 10 mmφ, and the minimum inner diameter is 19 mmφ based on a predetermined calibration curve.
The cylindrical foam was taken off at a take-off speed of 7.9 m/min, which was slower than the take-off speed of 9.3 m/min, and a take-up speed of 11.0 m/min, which was faster than the take-up speed of 9.3 m/min. At this time, the take-up was carried out by winding it onto a take-up roll. Table 1 shows the inner diameter, outer diameter, and density of the obtained cylindrical foam for each take-up speed. Example 2 A resin having the same composition as in Example 1 except that the pressurized injection amount of butane was 6.5 parts per 100 parts of resin was extruded from a die having an annular hole with a minimum diameter of 1.7 mmφ and a maximum diameter of 10 mmφ, and the resin was determined in advance. The pulling speed is 10.7 m/min, which is slower than the 12.5 m/min that gives the minimum inner diameter of 25 mmφ based on the calibration curve, and the faster is 13.8 m/min.
It was taken off at a speed of m/min to obtain a cylindrical foam. On this occasion,
The collection was carried out by winding it on a collection roll. Table 1 shows the inner diameter, outer diameter, and density of the obtained cylindrical foam for each take-up speed. Example 3 A resin having the same composition as in Example 1, except that the amount of pressurized butane injected to 100 parts of resin was 8.5 parts, was extruded from a die having an annular hole with a minimum diameter of 0.3 mmφ and a maximum diameter of 8 mmφ. Based on the calibration curve, the pulling speed is 13.7 m/min, which is slower than the pulling speed of 16.9 m/min, which gives the minimum inner diameter of 13 mmφ, and the faster pulling speed is 19.0 m/min.
A cylindrical foam was obtained by taking off at a speed of m/min. At this time, the take-up was carried out by winding it on a take-up roll. Table 1 shows the inner diameter, outer diameter, and density of the obtained cylindrical foam for each take-up speed. Example 4 Density 0.922g/cm 3 , Melt index 0.3g/
After heating and melting 100 parts of linear low-density polyethylene and 1.0 part of monosodium citric acid in a 90 mmφ extruder, 100 parts of linear low-density polyethylene
5 parts of butane was injected under pressure and kneaded, and while maintaining the resin temperature at 105 to 106°C, it was extruded through a die having an annular hole with a minimum exit diameter of 0.5 mmφ and a maximum diameter of 10 mmφ, and the pre-determined amount was A slower pulling speed of 7.5 m/min and a faster pulling speed of 10.4 are lower than the pulling speed of 8.7 m/min that gives a minimum inner diameter of 21 mmφ based on the calibration curve.
A cylindrical foam was obtained by taking off at a speed of m/min. At this time, the take-up was carried out by winding it onto a take-up roll. Table 1 also shows the inner diameter, outer diameter, and density of the obtained cylindrical foam with respect to the take-up speed. Example 5 100 parts of polystyrene with a melt index of 2.0 g/10 min and 1.0 part of monosodium citrate were added to a 90 mm
After heating and melting in a φ extruder, 5 parts of butane is injected under pressure to 100 parts of polystyrene and kneaded, and while maintaining the resin temperature at 118-120℃, the minimum diameter of the outlet is 0.5 mmφ and the maximum diameter is 10 mmφ. Extrusion through a die with an annular hole of 7.8 m/min, which yields a minimum inner diameter of 18 mmφ based on a predetermined calibration curve, is slower than 8.5 m/min, and 9.1 m/min is faster.
A cylindrical foam was obtained by taking off at a speed of m/min. At this time, collection was carried out using the Caterpillar method. The inner diameter, outer diameter, and density of the obtained cylindrical foam for each take-up speed are shown in the table.
【表】
度
[Table] Degrees
第１図は引取速度に対する筒状発泡体の内径、
外径の関係を示す検量線を示すグラフである。
Figure 1 shows the inner diameter of the cylindrical foam as a function of the take-up speed.
It is a graph showing a calibration curve showing the relationship between outer diameters.
Claims (1)
製造する方法において、一定大きさのダイによつ
て形成される筒状発泡体の引取速度の増加により
直線状に減少する外径の数値変化を求め且つ引取
速度の増加により最初減少し極小値を通過後増加
する内径の数値変化を求め、得られた各数値変化
に基づいて引取速度を変化させることにより筒状
発泡体の内径及び外径をコントロールすることを
特徴とする熱可塑性樹脂筒状発泡体の内径及び外
径のコントロール法。1 In a method of extrusion manufacturing a thermoplastic resin cylindrical foam using an extruder, a numerical change in the outer diameter that decreases linearly with an increase in the take-up speed of the cylindrical foam formed by a die of a constant size is The inner diameter and outer diameter of the cylindrical foam can be determined by determining the numerical changes in the inner diameter that initially decrease and then increase after passing through the minimum value as the drawing speed increases, and by changing the drawing speed based on each numerical change obtained. A method for controlling the inner diameter and outer diameter of a thermoplastic resin cylindrical foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58149298A JPS6042022A (en) | 1983-08-16 | 1983-08-16 | Control of inner and outer diameters of thermoplastic resin tubular foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58149298A JPS6042022A (en) | 1983-08-16 | 1983-08-16 | Control of inner and outer diameters of thermoplastic resin tubular foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6042022A JPS6042022A (en) | 1985-03-06 |
| JPS6324810B2 true JPS6324810B2 (en) | 1988-05-23 |
Family
ID=15472102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58149298A Granted JPS6042022A (en) | 1983-08-16 | 1983-08-16 | Control of inner and outer diameters of thermoplastic resin tubular foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6042022A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4952352A (en) * | 1985-04-04 | 1990-08-28 | Shin Yong W | Process for producing a low density foamed polyethylene |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4862861A (en) * | 1971-12-06 | 1973-09-01 |
-
1983
- 1983-08-16 JP JP58149298A patent/JPS6042022A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4862861A (en) * | 1971-12-06 | 1973-09-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6042022A (en) | 1985-03-06 |
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