JPH0582286B2 - - Google Patents
Info
- Publication number
- JPH0582286B2 JPH0582286B2 JP59166319A JP16631984A JPH0582286B2 JP H0582286 B2 JPH0582286 B2 JP H0582286B2 JP 59166319 A JP59166319 A JP 59166319A JP 16631984 A JP16631984 A JP 16631984A JP H0582286 B2 JPH0582286 B2 JP H0582286B2
- Authority
- JP
- Japan
- Prior art keywords
- section
- screw
- resin
- cross
- die
- 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 - Lifetime
Links
- 229920005989 resin Polymers 0.000 claims description 52
- 239000011347 resin Substances 0.000 claims description 52
- 238000001125 extrusion Methods 0.000 claims description 33
- 229920001187 thermosetting polymer Polymers 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 description 14
- 239000000047 product Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 229920000877 Melamine resin Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- 241000239290 Araneae Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 239000008096 xylene 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
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- 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
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/10—Thermosetting resins
-
- 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
- B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
- B29K2301/10—Thermosetting resins
Description
産業上の利用分野：
本発明は熱硬化性樹脂の新規な押出成形装置に
関する。
従来の技術とその問題点：
熱硬化性樹脂の成形方法としては圧縮成形法、
トランスフアー成形法、射出成形法および押出成
形法が知られ、夫々の成形方法に適合した装置が
用いられている。
これらの熱硬化性樹脂の成形方法のうち、押出
成形装置としてはプランジヤー押出装置が一般的
であり、（例えば、特開昭48−83155公報、プラス
チツクスVol.25，No.3P47）丸棒やパイプなどの
単純な形状の長尺押出製品が生産されている。し
かし乍らプランジヤー押出成形装置に於ては、金
型部における押出圧が高く、しかも間欠押出であ
るため均一な成形品を得ることが困難であり生産
性も低い。
かゝる事情から、所謂スクリユー型押出成形装
置を用いる成形法が例えば特開昭54−23661公報
により開示されている。これは押出機内で混練溶
融された熱硬化性樹脂を、アダプターを通じて金
型内へ導びき最終形状に賦形する成形装置であ
る。しかし乍らこの様な成形装置では、樹脂流路
が複雑に変化し、僅かな温度や圧力の差で熱硬化
反応が急激に進行したり、滞留の発生によつて局
部的に硬化反応が進行したりすることにより、連
続して安定な成形を行うことが困難であつた。
問題点を解決する手段：
本発明者らは、建築分野、電気、電子分野等に
おいて市場の要求の強い難燃性、耐熱性等に優れ
た熱硬化性樹脂の成形品の成形方法、特に上記し
た問題点の解決について種々検討を重ねた結果、
樹脂の流入口の断面が押出機のシリンダーとスク
リユー先端部によつて形成される円周状断面に等
しく、その後の樹脂流路を滑らかに変化させて出
口の断面を所望の形状にまで導くようにしたダイ
スをスクリユー先端に近接して装着し、そのダイ
ス内に於て押出後自己形状を保持できる程度にま
で賦形することにより連続的に且つ安定でしかも
生産性良く成形し得ることを見出して本発明に到
達した。
すなわち、本発明は、供給部、圧縮部および計
量部から成り、かつ、先端部形状が円柱状である
スクリユー、該供給部、圧縮部および計量部に対
応する熱制御機構を有するシリンダー部分、およ
び樹脂の流入口の断面が、スクリユー計量部に対
応する押出機のシリンダーとスクリユー計量部の
底部とによつて形成される環状断面に等しく、そ
の後の樹脂流路を、樹脂出口側の断面の平均周囲
長が樹脂入口側の断面の平均周囲長の0.7〜1.5倍
となるように滑らかに変化させたダイスより成
り、該ダイスをダイスの樹脂入口部とスクリユー
先端部との距離が0.05〜２mmとなるように装着
し、そのダイス内に於いて硬化反応を促進させ押
出後自己形状を保持できる程度にまで賦形する様
にした熱硬化性樹脂のスクリユー型押出成形装置
である。
本発明の特徴は押出機の先端に装着するダイス
構造とその装着にあり、使用される押出装置とし
ては、単軸スクリユー押出装置のみならず、二軸
スクリユーあるいは多軸スクリユー押出装置であ
つても先端部が最終的に単軸に集約される押出装
置の何れも使用できる。本発明に使用できるこれ
らの押出装置の内部構造として、押出装置の供給
部から先端の計量部に至る間に脱気孔を設けた
り、特殊な混練構造を設けることは何ら差し支え
ない。またダイスの先端にダイス出口より極くわ
ずか小さい断面を有する装置を装着し樹脂にかか
る背圧を調整できるようにしてもよい。
本発明を図によつて説明すれば、第１図は発明
の好ましい押出装置の１例を示したもので、第２
図は本発明に使用されるダイスの１例を示したも
のである。
第１図に於てホツパー１より供給された熱硬化
性樹脂材料は、シリンダー２内でヒーター３によ
り加熱熔融され、スクリユー４の回転により熔融
状態のまま先へ送られダイス５内へ導入され、次
いでダイス内の流路を移行し、最終製品形状と同
一の断面を有する出口流路６に導びかれ、出口か
ら押出されるまでの間に硬化が促進され、押出後
自己形状を保持できる程度にまで賦形されて成形
品７となつて押出される構造となつている。ダイ
スの樹脂入口の断面は、スクリユー計量部に対応
する押出機のシリンダーとスクリユー計量部の底
部とにより形成される環状断面に等しく、出口の
断面は、所望の製品形状である。ダイス内の樹脂
の流路はこの間に滑らかに変化させる構造となつ
ている。
樹脂の流路の変化は、ダイスの入口からスパイ
ダーを越えた位置のところまで行なう様にする構
造が好ましい。ダイス内へ導入された樹脂は、溶
融状態のまま滑らかに変化する流路に従つて移行
しスパイダー部分を通過した後、出口断面に等し
い断面を有する流路においてダイス出口に至る間
に賦形硬化される。ここで出口断面に等しい断面
を有する流路の長さは、肉厚、使用される樹脂の
活性、硬化速度等の特性、その他の成形条件等の
組合せにより、変えることが必要であるが、通常
1D〜10D（ここでＤは押出機の口径を示す）、好
ましくは2D〜7D、更に好ましくは2D〜5Dの範
囲から適宜選択することができる。この長さが
1D未満の場合は、硬化が充分行なわれにくく良
好な成形品が得難い傾向があり、また10D以上と
なる場合は、背圧が大きくなりすぎて押出が困難
となる傾向がある。また、出口側の断面形状に関
しては、その平均周囲長は入口側のそれの0.3〜
３倍好ましくは0.5〜２倍更に好ましくは0.7〜1.5
倍、肉厚は入口側のそれの0.3〜５倍好ましくは
0.5〜４倍更に好ましくは0.7〜３倍の範囲から適
宜選択することができる。本発明において、平均
周囲長とは、ダイスの樹脂の入口側断面および出
口側断面の最小周囲長と最大周囲長との和の二分
の一の値を意味する。例えば出口側の断面の平均
周囲長が入口側のそれの0.3〜３倍の範囲を逸脱
する場合、あるいは出口側の断面の肉厚が入口側
のそれの0.3〜５倍の範囲を逸脱する場合のよう
に樹脂流路の変化がなめらかでない場合には、樹
脂の流れがなめらかに行なわれず、硬化が進みす
ぎて押出が困難になるので好ましくない。
本発明に使用されるスクリユーは通常樹脂の押
出成形に使用されるスクリユーであれば何れでも
良いが、フルフライト型や先端に平滑部を有する
様な形状のものが望ましい。
スクリユー先端の形状は円柱状であることが好
ましく、また、スクリユー先端とダイスの距離は
出来るだけ近接することが望ましく通常0.05〜２
mmの範囲から適宜選択される。
本発明の装置を使用するにあたつて、押出装置
各部の温度設定は、使用する材料の特性やスクリ
ユー圧縮比、製品の肉厚、押出速度等の組合せに
より当然変るが、スクリユーの圧縮部及び計量部
に対応するシリンダー部位及びダイスの温度設定
は通常50〜200℃、好ましくは60〜150℃の範囲で
ある。
而して設定温度が50℃以下の場合は、樹脂の硬
化反応が充分に進行しないため良好な成形品は得
難い傾向があり、一方200℃までの温度で通常用
いられる熱硬化性樹脂は充分に熱硬化するのでそ
れ以上にする必要はない。
通常、熱硬化性樹脂の押出成形法に於てはシリ
ンダー内で加熱溶融された樹脂は、アダプターを
経て金型内へ導入され最終形状に賦形されるが、
この過程に於て樹脂の流路が複雑に変化するため
に、樹脂の滞留が起りやすく、局部的に硬化反応
が進行したり、僅かな圧力や温度の変化で硬化反
応が急激に起るなどの問題を引き起す。また、複
雑な流路による抵抗に打ち勝ち滞留を防止しつつ
樹脂を押出すためには、強大な押出圧力を要し特
殊な押出装置を必要とする。
しかし乍ら、本発明の装置によれば、押出機の
スクリユー先端部以降の樹脂の流路の変化は滑ら
かであり、かつ小さいので樹脂の滞留は全くなく
局部的な硬化反応や圧力、温度の変化による急激
な硬化反応を引き起すことがない。
本発明の装置により押出された成形品は必要に
応じ更に後硬化しても良い。この場合、成形品
は、適宜加熱処理する事によつて硬化が完了す
る。
しかし乍ら、本発明の装置による場合は、押出
された時点で既に自己形状を保持するに充分なま
で成形条件を制御して硬化、賦形されるため、変
形、反り、曲り、脹れなどの現象を起すことがな
い。
本発明の装置に用いられる熱硬化性樹脂として
は、フエノール樹脂、メラミン樹脂、尿素樹脂、
不飽和ポリエステル樹脂、エポキシ樹脂、シリコ
ン樹脂、アリル樹脂、キシレン樹脂、アニリン樹
脂等の熱硬化性樹脂、およびポリエチレン、ポリ
プロピレン、ポリスチレン、ポリ塩化ビニール等
の熱可塑性樹脂に架橋剤を加えて本発明のスクリ
ユーの平滑部に於て押出後自己形状を保持し得る
程度にまで賦形できる樹脂等が挙げられ、なかで
もフエノール樹脂およびメラミン樹脂の成形に好
適である。
本発明に用いられる熱硬化性樹脂には必要に応
じて熱硬化性樹脂の成形に於て一般に用いられる
充填剤、離型剤、増粘剤、着色剤、分散剤、発泡
剤、あるいはまた重合開始剤、硬化促進剤、重合
禁止剤などを添加することができる。
また更に他種のポリマーあるいは有機または無
機の繊維状物、例えば硝子等を加えることもでき
る。
以上説明した如く、本発明の装置によれば難燃
性および耐熱性能の優れた熱硬化性樹脂の長尺押
出製品を容易に生産性良く製造することができ
る。
以下本発明の装置を実施例により更に説明する
が本発明は以下の実施例に限定されるものではな
い。
実施例 １
口径40mm、Ｌ／Ｄ＝24の押出機により、供給部
3D、圧縮部16D、底部の径が34mm、長さ5Dの計
量部を有する圧縮比2.0のスクリユーを用い、樹
脂の流入口の断面が外径40mm内径34mm、出口側の
樹脂流路の断面が外径46mm、内径40mm、出口側と
同一の断面を有する流路の長さが100mm、全長180
mmのダイスをスクリユー先端より0.5mmの位置に
装着して押出成形を行なつた。成形材料としてフ
エノール樹脂（日本合成化工株式会社製、商品
名、ニツカライト950−Ｊ）を用い装置各部の温
度は、
C1（０〜2D） ……水冷
C2（3D〜10D） ……70℃
C3（11D〜16D） ……85℃
C4（17D〜20D） ……95℃
C5（21D〜24D） ……105℃
D1 ……110℃
D2 ……130℃
に設定してスクリユー回転数30rpmで成形を行な
つた。結果は第１表に示した通りである。
実施例 ２
実施例１と同じ押出機及びスクリユーを使用
し、樹脂の流入口の断面が外径40mm、内径34mm、
出口側の断面が外周188mm（１辺長47mmの正方
形）、内周160mm（１辺長40mmの正方形）であり、
出口側と同一の断面を有する流路の長さが90mm、
全長200mmのダイスをスクリユー先端より0.8mmの
位置に装着して押出成形を行なつた。
成形材料は、メラミン樹脂（オタライト株式会
社製、商品名、ON−600）を用い、装置各部の
温度はC1……水冷、C2……70℃、C3……85℃、
C4……100℃、C5……110℃、D1……110℃、D2…
…135℃に設定し、スクリユー回転数30rpmで成
形を行なつた。結果は第１表に示した通りであ
る。
Industrial Application Field: The present invention relates to a novel extrusion molding apparatus for thermosetting resins. Conventional technologies and their problems: Compression molding methods are used to mold thermosetting resins,
Transfer molding methods, injection molding methods, and extrusion molding methods are known, and equipment suitable for each molding method is used. Among these methods of molding thermosetting resins, plunger extrusion equipment is commonly used as the extrusion molding equipment (e.g., JP-A-48-83155, Plastics Vol. 25, No. 3P47). Long extruded products with simple shapes such as pipes are produced. However, in the plunger extrusion molding apparatus, the extrusion pressure in the mold section is high and intermittent extrusion is used, so it is difficult to obtain uniform molded products and the productivity is low. Under these circumstances, a molding method using a so-called screw type extrusion molding apparatus has been disclosed, for example, in Japanese Patent Application Laid-Open No. 54-23661. This is a molding device that guides the thermosetting resin kneaded and melted in an extruder into a mold through an adapter and shapes it into the final shape. However, in such molding equipment, the resin flow path changes in a complicated manner, and the thermosetting reaction may proceed rapidly due to a slight difference in temperature or pressure, or the curing reaction may proceed locally due to the occurrence of stagnation. It has been difficult to perform continuous and stable molding due to this. Means for Solving the Problems: The present inventors have developed a method for molding thermosetting resin molded products with excellent flame retardancy, heat resistance, etc., which are in strong market demand in the fields of architecture, electricity, electronics, etc. As a result of various studies on how to solve the problems,
The cross section of the resin inlet is equal to the circumferential cross section formed by the cylinder and screw tip of the extruder, and the subsequent resin flow path changes smoothly to guide the outlet cross section to the desired shape. It has been discovered that by attaching a molded die close to the tip of the screw and shaping the material within the die to the extent that it can maintain its own shape after extrusion, it is possible to form the product continuously, stably, and with high productivity. We have arrived at the present invention. That is, the present invention provides a screw that is composed of a supply section, a compression section, and a metering section and has a cylindrical tip, a cylinder section that has a heat control mechanism corresponding to the supply section, compression section, and metering section, and The cross section of the resin inlet is equal to the annular cross section formed by the cylinder of the extruder corresponding to the screw metering section and the bottom of the screw metering section, and the subsequent resin flow path is defined as the average cross section of the resin outlet side. It consists of a die whose circumference changes smoothly so that it is 0.7 to 1.5 times the average circumference of the cross section on the resin inlet side, and the distance between the resin inlet of the die and the screw tip is 0.05 to 2 mm. This is a screw-type extrusion molding device for thermosetting resin, which is mounted so as to promote the curing reaction within the die and shape the thermosetting resin to the extent that it can maintain its own shape after extrusion. The feature of the present invention is the die structure attached to the tip of the extruder and its attachment.The extrusion device used is not only a single screw extrusion device, but also a twin screw extrusion device or a multi-screw extrusion device. Any extrusion device whose tips end up converging onto a single shaft can be used. As for the internal structure of these extrusion devices that can be used in the present invention, there is no problem in providing a deaeration hole or a special kneading structure between the supply section and the measuring section at the tip of the extrusion device. Alternatively, a device having a cross section slightly smaller than the die outlet may be attached to the tip of the die so that the back pressure applied to the resin can be adjusted. To explain the present invention using figures, FIG. 1 shows one example of a preferred extrusion device of the invention, and FIG.
The figure shows one example of a die used in the present invention. In FIG. 1, the thermosetting resin material supplied from the hopper 1 is heated and melted by the heater 3 in the cylinder 2, and is sent forward in a molten state by the rotation of the screw 4 and introduced into the die 5. Then, it moves through the flow path in the die and is guided to an outlet flow path 6 having the same cross section as the final product shape, and hardening is promoted until it is extruded from the outlet to the extent that it can maintain its own shape after extrusion. The structure is such that it is shaped into a molded product 7 and then extruded. The resin inlet cross section of the die is equal to the annular cross section formed by the extruder cylinder corresponding to the screw metering section and the bottom of the screw metering section, and the outlet cross section is the desired product shape. The resin flow path within the die is structured to smoothly change during this time. It is preferable to have a structure in which the flow path of the resin is changed from the inlet of the die to a position beyond the spider. The resin introduced into the die moves along a smoothly changing flow path in a molten state, passes through the spider section, and then is shaped and hardened while reaching the die exit in a flow path with a cross section equal to the exit cross section. be done. Here, the length of the flow path with a cross section equal to the exit cross section needs to be changed depending on a combination of wall thickness, properties such as the activity of the resin used, curing speed, and other molding conditions, but usually
It can be appropriately selected from the range of 1D to 10D (here, D indicates the diameter of the extruder), preferably 2D to 7D, and more preferably 2D to 5D. This length
If it is less than 1D, it tends to be difficult to cure sufficiently and it is difficult to obtain a good molded product, and if it is more than 10D, the back pressure tends to be too large and extrusion becomes difficult. In addition, regarding the cross-sectional shape on the outlet side, its average circumference is 0.3 to 0.3 of that on the inlet side.
3 times preferably 0.5 to 2 times, more preferably 0.7 to 1.5
The wall thickness is preferably 0.3 to 5 times that of the inlet side.
It can be appropriately selected from the range of 0.5 to 4 times, more preferably 0.7 to 3 times. In the present invention, the average peripheral length means a value that is half the sum of the minimum and maximum peripheral lengths of the inlet side cross section and outlet side cross section of the resin of the die. For example, if the average circumference of the cross section on the exit side is outside the range of 0.3 to 3 times that of the inlet side, or when the wall thickness of the cross section on the exit side is outside the range of 0.3 to 5 times that of the inlet side. If the change in the resin flow path is not smooth, as in the case shown in FIG. The screw used in the present invention may be any screw that is normally used for extrusion molding of resins, but it is preferably a full-flight type or one with a shape that has a smooth portion at the tip. The shape of the screw tip is preferably cylindrical, and the distance between the screw tip and the die is preferably as close as possible, usually 0.05 to 2
Appropriately selected from the range of mm. When using the device of the present invention, the temperature settings for each part of the extrusion device will naturally vary depending on the characteristics of the material used, screw compression ratio, product wall thickness, extrusion speed, etc. The temperature setting of the cylinder portion corresponding to the measuring section and the die is usually in the range of 50 to 200°C, preferably 60 to 150°C. However, if the set temperature is below 50℃, the curing reaction of the resin will not proceed sufficiently and it will be difficult to obtain a good molded product.On the other hand, thermosetting resins normally used at temperatures up to 200℃ will Since it hardens under heat, there is no need to heat it any further. Normally, in the extrusion molding method for thermosetting resins, the resin is heated and melted in a cylinder, then introduced into a mold through an adapter and shaped into the final shape.
Because the flow path of the resin changes in a complicated manner during this process, it is easy for the resin to stagnate, causing the curing reaction to progress locally, or causing the curing reaction to occur rapidly with a slight change in pressure or temperature. cause problems. In addition, in order to overcome the resistance caused by the complicated flow paths and extrude the resin while preventing stagnation, a large extrusion pressure is required and a special extrusion device is required. However, according to the device of the present invention, changes in the flow path of the resin after the tip of the screw of the extruder are smooth and small, so there is no stagnation of the resin, and there is no local curing reaction or change in pressure or temperature. Changes will not cause rapid curing reactions. The molded product extruded by the apparatus of the present invention may be further post-cured if necessary. In this case, the molded product is completely cured by heat treatment as appropriate. However, in the case of the apparatus of the present invention, the molding conditions are controlled to a sufficient extent to maintain the self-shape at the time of extrusion, and the molding conditions are controlled to harden and shape the product. This phenomenon does not occur. Thermosetting resins used in the device of the present invention include phenolic resins, melamine resins, urea resins,
The present invention is produced by adding a crosslinking agent to thermosetting resins such as unsaturated polyester resins, epoxy resins, silicone resins, allyl resins, xylene resins, and aniline resins, and thermoplastic resins such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride. Examples include resins that can be shaped to the extent that they can maintain their own shape after extrusion in the smooth part of the screw, and are particularly suitable for molding phenolic resins and melamine resins. The thermosetting resin used in the present invention may optionally contain fillers, mold release agents, thickeners, colorants, dispersants, blowing agents, or polymerization agents commonly used in the molding of thermosetting resins. Initiators, curing accelerators, polymerization inhibitors, etc. can be added. Furthermore, other types of polymers or organic or inorganic fibrous materials such as glass can also be added. As explained above, according to the apparatus of the present invention, long extruded thermosetting resin products with excellent flame retardancy and heat resistance can be easily manufactured with good productivity. The apparatus of the present invention will be further explained below with reference to Examples, but the present invention is not limited to the following Examples. Example 1 Using an extruder with a diameter of 40 mm and L/D = 24, the supply section was
Using a screw with a compression ratio of 2.0, which has a compression section of 16D, a bottom diameter of 34mm, and a metering section of length 5D, the cross section of the resin inlet is 40 mm in outer diameter, the inner diameter is 34 mm, and the cross section of the resin flow path on the outlet side is 3D. Outer diameter 46mm, inner diameter 40mm, flow path length 100mm with the same cross section as the outlet side, total length 180mm
Extrusion molding was carried out by installing a mm die at a position 0.5 mm from the screw tip. Phenol resin (manufactured by Nippon Gosei Kako Co., Ltd., trade name, Nikalite 950-J) was used as the molding material, and the temperatures of each part of the device were: C 1 (0 to 2D)...Water cooling C2 (3D to 10D)...70℃ C 3 (11D to 16D) ...85℃ C 4 (17D to 20D) ...95℃ C 5 (21D to 24D) ...105℃ D 1 ...110℃ D 2 ...130℃ Molding was performed at a rotation speed of 30 rpm. The results are shown in Table 1. Example 2 Using the same extruder and screw as in Example 1, the cross section of the resin inlet was 40 mm in outer diameter, 34 mm in inner diameter,
The cross section on the exit side is an outer circumference of 188 mm (a square with a side length of 47 mm) and an inner circumference of 160 mm (a square with a side length of 40 mm).
The length of the channel with the same cross section as the outlet side is 90 mm,
Extrusion molding was performed using a die with a total length of 200 mm installed at a position 0.8 mm from the screw tip. The molding material used was melamine resin (manufactured by Otalite Co., Ltd., product name: ON-600), and the temperatures of each part of the device were C1 ...water cooling, C2 ...70℃, C3 ...85℃,
C 4 …100℃, C 5 …110℃, D 1 …110℃, D 2 …
... Molding was carried out at a temperature of 135°C and a screw rotation speed of 30 rpm. The results are shown in Table 1.
【表】
注１…管軸方向の圧縮強度。試験法は、
JIS K 6911、5、19、5項による。
[Table] Note 1: Compressive strength in the tube axis direction. The test method is
According to JIS K 6911, 5, 19, 5.
第１図は本発明の好ましい装置の１例を示した
ものであり、第２図及び第３図は本発明のダイス
の１例を示したものである。
１……ホツパー、２……シリンダー、３……ヒ
ーター、４……スクリユー、５……ダイス、６…
…最終製品と同じ断面を有する流路、７……成形
品。
FIG. 1 shows one example of a preferred apparatus of the invention, and FIGS. 2 and 3 show examples of the dice of the invention. 1...Hopper, 2...Cylinder, 3...Heater, 4...Screw, 5...Dice, 6...
...Channel having the same cross section as the final product, 7... Molded product.
Claims (1)
つ、先端部形状が円柱状であるスクリユー、該供
給部、圧縮部および計量部に対応する熱制御機構
を有するシリンダー部分、および樹脂の流入口の
断面が、スクリユー計量部に対応する押出機のシ
リンダーとスクリユー計量部の底部とによつて形
成される環状断面に等しく、その後の樹脂流路
を、樹脂出口側の断面の平均周囲長が樹脂入口側
の断面の平均周囲長の0.7〜1.5倍となるように滑
らかに変化させたダイスより成り、該ダイスをダ
イスの樹脂入口部とスクリユー先端部との距離が
0.05〜２mmとなるように装着し、そのダイス内に
於いて硬化反応を促進させ押出後自己形状を保持
できる程度にまで賦形する様にした熱硬化性樹脂
のスクリユー型押出成形装置。1. A screw consisting of a supply section, a compression section and a metering section and having a cylindrical tip, a cylinder section having a heat control mechanism corresponding to the supply section, compression section and metering section, and a resin inlet. The cross section is equal to the annular cross section formed by the cylinder of the extruder corresponding to the screw metering section and the bottom of the screw metering section, and the average circumference of the cross section on the resin outlet side is the resin inlet. It consists of a die that smoothly changes so that the average circumference of the side cross section is 0.7 to 1.5 times, and the distance between the resin inlet of the die and the screw tip is
A screw-type extrusion molding device for thermosetting resin, which is installed so that the thickness is 0.05 to 2 mm, promotes the curing reaction within the die, and shapes the thermosetting resin to the extent that it can maintain its own shape after extrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59166319A JPS6144622A (en) | 1984-08-10 | 1984-08-10 | Screw type extrusion molding apparatus of thermosetting resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59166319A JPS6144622A (en) | 1984-08-10 | 1984-08-10 | Screw type extrusion molding apparatus of thermosetting resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6144622A JPS6144622A (en) | 1986-03-04 |
| JPH0582286B2 true JPH0582286B2 (en) | 1993-11-18 |
Family
ID=15829145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59166319A Granted JPS6144622A (en) | 1984-08-10 | 1984-08-10 | Screw type extrusion molding apparatus of thermosetting resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6144622A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2635600B2 (en) * | 1987-07-24 | 1997-07-30 | 三井東圧化学株式会社 | Cylinder for electrostatic latent image forming drum |
-
1984
- 1984-08-10 JP JP59166319A patent/JPS6144622A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6144622A (en) | 1986-03-04 |
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