JP2781376B2 - Hollow molded products - Google Patents
Hollow molded productsInfo
- Publication number
- JP2781376B2 JP2781376B2 JP8155708A JP15570896A JP2781376B2 JP 2781376 B2 JP2781376 B2 JP 2781376B2 JP 8155708 A JP8155708 A JP 8155708A JP 15570896 A JP15570896 A JP 15570896A JP 2781376 B2 JP2781376 B2 JP 2781376B2
- Authority
- JP
- Japan
- Prior art keywords
- flow path
- hollow molded
- parison
- shut
- resin material
- 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
- 239000000463 material Substances 0.000 claims description 41
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 239000002356 single layer Substances 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 239000004700 high-density polyethylene Substances 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000007779 soft material Substances 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 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
- B29C48/03—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
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- 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
- B29C48/131—Curved 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
-
- 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
- B29C48/269—Extrusion in non-steady condition, e.g. start-up or shut-down
- B29C48/2692—Material change
-
- 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
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3004—Preforms or parisons made of several components having longitudinally different components within one layer, e.g. tubes with longitudinal stratified layering
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0633—LDPE, i.e. low density polyethylene
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、基本的に単層であ
り且つ樹脂材料からなる中空成形品に関するものであ
る。
【０００２】
【従来の技術】従来、図１に示す如く、本体部分１は剛
性に富んだ内、外層１ａ，１ｃの間に例えば断熱性に優
れた発泡材１ｂを挟んだ３層構造に形成され、ネジ山等
の閉栓手段を一体に形成する為に特に剛性を必要とする
口部２は剛性に富んだ単一材質から成る容器Ｃ等を製造
する場合、口部２だけを別個に成形し本体１に二次的に
固着するのが通常である。然るに、二次的に固着する方
法は製造工数をより多く費やすだけでなく、必要な固着
強度を確保することが要求される。
【０００３】又、特に材料費が相対的に高価である樹脂
成形品の製造に於いては、成形工程で発生するロス部分
の再利用は重要な課題であるが、図１に示した様な３層
構造品の成形に於いて発生するロスには多種類の材料が
混在しその再利用が容易でない。
【０００４】
【発明が解決しようとする課題】本発明は以上の点に鑑
みてなされたものであって、中空成形品の各部を用途に
応じた材質構成で一体に容易に成形でき且つ発生するロ
ス材料の再利用にも好適な複合材質を備えた中空成形品
を提供することを目的とする。
【０００５】
【発明の実施の形態】以下、本発明の構成について、具
体的に実施例に基づき説明する。まず、本発明方法が実
施される製造装置の１実施例について、図２の模式図に
基づき説明する。尚、本例の製造装置は、図３（ａ）に
示す如く蛇腹部Ｐ2 を例えば低密度ポリエチレン（ＬＤ
−ＰＥ）等の軟質材料で形成し、他部分Ｐ10，Ｐ11を高
密度ポリエチレン（ＨＤ−ＰＥ）等の硬質材料で形成し
て蛇腹部の伸縮性を向上させたパイプＰとか、図３
（ｂ）に示す如く嵌合部Ｊ2 を軟質材料で形成し他部分
Ｊ1を硬質材料で形成して嵌合性を改良した継手Ｊ、又
は図３（ｃ）に示す如く曲げ部Ｖ2 を軟質材料で接合部
Ｖ1 を硬質材料で夫々形成し使用箇所への対応性を良く
したエルボＶ等の如く、２種類の材質構成を有する中空
製品を製造することを目的とした装置である。
【０００６】図２に於いて、夫々の内部に形成された流
路３ａ，４ａにスクリュー５が夫々配設されて成る２機
の第１、第２パリソン押出機３，４が設けられており、
その各先端は共通のノズル６に連結されている。従っ
て、各ホッパ（不図示）から供給された熱可塑性樹脂材
料は、加熱溶融されつつスクリュー５の回転と共にノズ
ル６に向けて各流路内を流動せしめられる。このノズル
６は、送られてくる樹脂材料を鉛直下方に注出すべく配
設されている。ノズル６の略中央部には、下端が先細状
に形成されたマンドレル６ａが鉛直に配置されており、
この中心部には、コンプレッサ６ａ2 等の加圧気体供給
源に接続された通風孔６ａ1 が穿設されている。このマ
ンドレル６ａの周囲には、第１流路７がマンドレル６ａ
の軸方向に沿って形成されている。そして、更に第１流
路７の外側には内管部材６ｂにより第１流路７から仕切
られた第２流路８が形成されていて、第２流路８はその
通流方向がマンドレル６ａの軸方向に沿う様に外管部材
６ｃによりその通流域が形成されている。第１流路７及
び第２流路８の夫々の下端部はノズル６の下端面近傍で
合流し、パリソンの注出口６ｄを形成している。一方、
第１、第２各流路７，８の上方部分はノズル６の側面方
向に屈曲され、第１流路７は第１押出機３の流路３ａ
と、第２流路８は第２押出機４の流路４ａと、夫々連通
されている。尚、ノズル６の直下域には注出されたパリ
ソンを収容すると共にブロー成形を実施する金型セット
（不図示）が配設されている。
【０００７】而して、例えば本例の如く各押出機３，４
とノズル６との連絡部には、各流路３ａ，４ａを適宜遮
断可能なシャットオフバルブ９，１０が介設されてい
る。シャットオフバルブ９，１０は、夫々制御手段１１
に接続されており、制御手段１１の指示に応じて各流路
３ａ，４ａを開閉する。従って、制御手段１１として例
えばマイクロコンピュータ等を用い成形すべき製品の材
質構成に応じた適切な動作パターンをプログラムとして
記憶させておき、これに沿って各シャットオフバルブを
開閉すれば、所望の材料構成でパリソンが注出形成され
る。尚、この場合、各シャットオフバルブ９，１０と各
押出機３，４の動作を適宜連動させて各流路３ａ，４ａ
内の圧力を異常に上昇させない様にすることが必要であ
る。又、注出されるパリソンの長さをノズル６の直下域
近傍に配置した光源ＬＳからの光ビームを光電管等の検
知手段ＰＤで捕え、制御手段１１がこの検知手段から送
られてくる信号に応じてシャットオフバルブ９，１０の
動作を制御する構成としても良い。
【０００８】次に、本発明方法の１実施例について、上
述した製造装置の動作に基づき説明する。ところで、図
３（ａ）に示した蛇腹部Ｐ2 を有するパイプＰを製造す
る場合は、原材料として前述した如く蛇腹部Ｐ2 用の軟
質性樹脂として例えばＬＤ−ＰＥを、他部分Ｐ10，Ｐ11
用の硬質性樹脂としては例えばＨＤ−ＰＥを使用すれば
良いが、他の例えば硬質塩化ビニルと軟質塩化ビニル等
の組合せでも良い。尚、軟質性樹脂と硬質性樹脂は互い
に溶融し易い本例の如き同系統の材料の組合せが境界部
の強度面等から望ましいが、親和性に乏しい材料の組合
せでも接着剤等を介在させることにより適用することが
可能である。今、第１押出機３にＨＤ−ＰＥを第２押出
機４にＬＤ−ＰＥを供給すべく押出機を選択する。そし
て、流路３ａからシャットオフバルブ９を介して第１流
路７を通り注出口６ｄに至る流路にはＨＤ−ＰＥを通流
させ、他方の流路４ａからシャットオフバルブ１０を介
して第２流路８を通り注出口６ｄに至る流路にはＬＤ−
ＰＥを通流させておく。
【０００９】先ず、製品のパイプＰのＨＤ−ＰＥから成
るＰ10の部分に相当するパリソンｐ10を抽出する為、バ
ルブ９を開いて第１押出機３を稼動させると共に、バル
ブ１０を閉じて第２押出機４を停止させる。パリソンｐ
10が製品ＰのＰ10部分の長さＬ10部分に相当する長さｌ
10だけ注出されたら、マイクロコンピュータを備えた制
御手段１１は所定のプログラムに基づきバルブ９を閉じ
て第１押出機３を停止させ、バルブ１０を開いて第２押
出機４を稼動させる。これにより、注出されるパリソン
ｐの材料がパイプＰの蛇腹部Ｐ2 に相当するＬＤ−ＰＥ
に切換えられる。この場合、各シャットオフバルブ９，
１０が注出口６ｄから離れている為、シャットオフバル
ブ９，１０の開閉動作に追従して直ちに注出される材料
が換わらず徐々に切り変えられる。この為、図示される
如く、その境界面が注出方向に対して斜めに形成される
が、それは実用上不都合のない程度であり、又却って機
械的強度が低下する境界部の強度アップに寄与する。Ｌ
Ｄ−ＰＥからなるパリソンｐ2 部分が蛇腹部Ｐ2 の長さ
Ｌ2 に相当する長さのｌ2 だけ注出されたら、同様に制
御手段１１が、初めのパリソンｐ10を注出した元の状態
に各バルブと各押出機の動作状態を切換え、パイプＰの
Ｐ11部分に相当するＨＤ−ＰＥからなるパリソンを注出
する。かくの如くして形成されたパイプＰの材質構成に
相当する材料構成を有するパリソンｐを直下に配置した
金型（不図示）内に収納して型締した後、例えば通風孔
６ａ1 から加圧気体を吹き込みブロー成形すれば、図３
（ａ）に示される如き伸縮性に富んだ蛇腹部Ｐ2 を有す
るパイプＰを得ることができる。尚、吹込方法をその他
の任意の公知の方法を使用可能であることは勿論であ
る。
【００１０】尚、上記実施例に於いては、シャットオフ
バルブ９，１０と第１、第２押出機３，４の動作を連動
させてパリソンの注出材料の切換を行なったが、材料の
境界部を比較的長く見込める製品に対しては、シャット
オフバルブ９，１０を省略し第１、第２押出機３，４だ
けを制御手段１１で駆動制御し所望の材料構成を有する
パリソンを得ることも可能である。
【００１１】次に、本発明装置の他の実施例について図
４の模式図に基づき説明する。尚、以下の実施例に於い
ては、上記実施例と同一構成要素については同一符号を
付しその説明を省略する。本例に於いては、２種類の材
料を通流させる２系統の流路の開閉を、シャットオフバ
ルブによらずにマンドレル１２を長手軸方向に移動させ
て行なう構成となっている。即ち、図４に示される如
く、ノズル６内に長手軸方向に移動自在に挿通支持され
たマンドレル１２の外部に突出した上部は例えば油圧装
置等の駆動手段１３に連結されている。この駆動手段１
３は同様に制御手段１１に接続されている。
【００１２】而して、マンドレル１２の注出口６ｄに近
い下端部には、その全周面に亘り突部ないしは係合部１
４が形成されている。又、このマンドレル１２の周面に
対向する内管部６ｂの内面６ｂ1 の下端部で上記突部な
いしは係合部１４より若干上部に離れた位置には、突部
ないしは係合部１５が突部ないしは係合部１４と係合可
能にその内周面に沿って形成されている。従って、マン
ドレルを上下方向に移動させることにより第１流路７が
開閉されここを流動する材料の流量を調節することがで
きる。
【００１３】尚、本例の装置により図３（ａ）乃至
（ｃ）に示した構成を有する中空成形品を製造する場
合、マンドレル１２を下降させて第１流路７を開くと共
に第２押出機４を停止させて材料の切換を行なえば良
い。又、２種類の注出材料の切換をより自在に行なう為
には、第２押出機４の流路４ａにのみシャットオフバル
ブ１０を設ける構成としても良い。更に、内管部６ｂが
上下方向に移動自在となる様にノズル６を構成し、図５
に示す如く、第２流路８を形成する内管部６ｂの外周面
と外管部６ｃの内周面に内管部６ｂを上昇させることに
より係合可能に突部１６，１７を夫々形成してもよい。
この場合、内管部６ｂを上下動させることにより抽出す
べき材料の切換を鋭敏に実施できる。
【００１４】
【発明の効果】以上詳述した如く、本発明によれば、成
形すべき製品の材質構成に対応して複種類の材料の注出
を制御しパリソンを形成することにより、用途に応じた
複合材質を備えた中空成形品を容易に成形可能となる。
又、複数の材料から成る中空成形品の成形毎に発生する
ロス材が単一の材料となる様に材料注出を制御できる
為、ロス材の再生利用率を大幅に向上させることができ
る。従って、用途に適した複合材質を有する高品質の中
空成形品を安価に製造可能となる。尚、本発明は上記の
特性の実施例に限定されるべきものではなく、本発明の
技術的範囲に於いて種々の変形が可能であることは勿論
である。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow molded article basically having a single layer and made of a resin material. 2. Description of the Related Art Conventionally, as shown in FIG. 1, a main body portion 1 is formed in a three-layer structure in which, for example, a foam material 1b having excellent heat insulating properties is sandwiched between outer layers 1a and 1c having high rigidity. When a container C or the like made of a single material having high rigidity is manufactured, only the mouth 2 is separately formed. Usually, it is secondarily fixed to the main body 1. However, the method of secondarily fixing not only requires more man-hours for manufacturing but also needs to secure necessary fixing strength. [0003] In the production of a resin molded product whose material cost is relatively expensive, it is an important issue to reuse a loss portion generated in the molding process. However, as shown in FIG. Many kinds of materials are mixed in the loss generated in the molding of the three-layer structure product, and it is not easy to reuse the material. SUMMARY OF THE INVENTION [0004] The present invention has been made in view of the above points, and each part of a hollow molded product can be easily and integrally formed with a material constitution suitable for a use. An object of the present invention is to provide a hollow molded article provided with a composite material that is also suitable for reuse of a loss material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on embodiments. First, an embodiment of a manufacturing apparatus in which the method of the present invention is performed will be described with reference to the schematic diagram of FIG. The production apparatus of this example, FIGS. 3 (a) are shown as bellows portion P 2, for example, low density polyethylene (LD
Formed of soft material -PE), etc., Toka pipe P with improved stretchability of the bellows portion to form other parts P 10, P 11 of a hard material such as high density polyethylene (HD-PE), 3
A fitting portion J 2 as shown in (b) is formed of a soft material other portions J 1 a joint J having improved compatibility fitting formed of a hard material, or FIG. 3 (c) to as shown bent portion V 2 the as elbow V or the like to improve the responsiveness of the junction V 1 of a soft material to each form using portions of a hard material, is a device intended to produce a hollow product with a two material construction . In FIG. 2, there are provided two first and second parison extruders 3, 4 in which screws 5 are respectively disposed in flow paths 3a, 4a formed inside the respective extruders. ,
Each tip is connected to a common nozzle 6. Therefore, the thermoplastic resin material supplied from each hopper (not shown) is caused to flow through each flow path toward the nozzle 6 with the rotation of the screw 5 while being heated and melted. The nozzle 6 is disposed so as to pour out the resin material sent vertically. At substantially the center of the nozzle 6, a mandrel 6a having a tapered lower end is vertically disposed.
This central portion, ventilation holes 6a 1 is drilled which is connected to a pressurized gas supply source, such as a compressor 6a 2. Around the mandrel 6a, a first flow path 7 is provided.
Are formed along the axial direction. Further, a second flow path 8 separated from the first flow path 7 by an inner pipe member 6b is formed outside the first flow path 7, and the flow direction of the second flow path 8 is changed to a mandrel 6a. The flow area is formed by the outer pipe member 6c along the axial direction. The lower ends of the first flow path 7 and the second flow path 8 merge near the lower end surface of the nozzle 6 to form a parison outlet 6d. on the other hand,
The upper portions of the first and second flow paths 7 and 8 are bent in the lateral direction of the nozzle 6, and the first flow path 7 is formed by the flow path 3 a of the first extruder 3.
And the second flow path 8 communicates with the flow path 4 a of the second extruder 4. A mold set (not shown) for accommodating the discharged parison and performing blow molding is provided immediately below the nozzle 6. Thus, for example, as shown in this embodiment, each of the extruders 3, 4
Shut-off valves 9 and 10 that can appropriately shut off the respective flow paths 3a and 4a are provided at a communication portion between the nozzle and the nozzle 6. The shut-off valves 9 and 10 are respectively provided with control means 11
And opens and closes each of the flow paths 3a and 4a in accordance with an instruction from the control means 11. Therefore, an appropriate operation pattern corresponding to the material composition of the product to be molded is stored as a program as a control means 11 using, for example, a microcomputer or the like, and each shut-off valve is opened and closed according to the program. A parison is poured out of the configuration. In this case, the operations of the shut-off valves 9 and 10 and the extruders 3 and 4 are appropriately linked to each other so that the flow paths 3a and 4a
It is necessary to prevent the internal pressure from rising abnormally. The light beam from the light source LS disposed near the area immediately below the nozzle 6 is captured by a detecting means PD such as a photoelectric tube, and the control means 11 responds to the signal sent from this detecting means by detecting the length of the parison to be discharged. Alternatively, the operation of the shut-off valves 9 and 10 may be controlled. Next, an embodiment of the method of the present invention will be described based on the operation of the above-described manufacturing apparatus. Incidentally, the case, for example, LD-PE as the soft resin for the bellows portion P 2 as mentioned above as a raw material for producing a pipe P having a bellows portion P 2 shown in FIG. 3 (a), the other part P 10, P 11
As the hard resin for use, for example, HD-PE may be used, but other combinations such as hard vinyl chloride and soft vinyl chloride may be used. The soft resin and the hard resin are preferably combined in the same system as in this example, which are easily melted from the viewpoint of the strength at the boundary, etc., but an adhesive or the like should be interposed even in the combination of materials having poor affinity. Can be applied. Now, an extruder is selected to supply HD-PE to the first extruder 3 and LD-PE to the second extruder 4. Then, HD-PE is passed through the flow path from the flow path 3a to the spout 6d through the first flow path 7 via the shut-off valve 9, and from the other flow path 4a through the shut-off valve 10. The LD-flow passage through the second flow passage 8 to the outlet 6d is provided.
Let PE flow through. [0009] First, in order to extract the parison p 10 corresponding to the portion of the P 10 consisting of HD-PE pipe P product, along with operating the first extruder 3 by opening the valve 9, by closing the valve 10 The second extruder 4 is stopped. Parison p
The length l of 10 corresponds to the length L 10 parts of P 10 portion of the product P
When only 10 has been dispensed, the control means 11 equipped with a microcomputer closes the valve 9 to stop the first extruder 3 and opens the valve 10 to operate the second extruder 4 based on a predetermined program. Thus, LD-PE Note material of the parison p issued corresponds to the bellows portion P 2 of the pipe P
Is switched to In this case, each shut-off valve 9,
Since the material 10 is away from the spout 6d, the material to be poured immediately following the opening / closing operation of the shut-off valves 9, 10 is gradually changed without being replaced. For this reason, as shown in the figure, the boundary surface is formed obliquely with respect to the pouring direction. However, this is a practically inconvenient degree, and on the contrary, contributes to an increase in the strength of the boundary portion where the mechanical strength decreases. I do. L
Once the parison p 2 part consisting of D-PE is dispensed only l 2 the length of which corresponds to the length L 2 of the bellows portion P 2, likewise the control unit 11, and the beginning of the parison p 10 out Note original switching the operating state of each valve and each extruder state and pouring a parison made of HD-PE corresponding to P 11 portion of the pipe P. After mold clamping is housed in the parison mold that is disposed immediately below the p (not shown) in having the material composition corresponding to the material structure of the pipe P formed by As Thus, for example, is applied from the ventilation holes 6a 1 Fig. 3
A pipe P having a bellows portion P2 with high elasticity as shown in FIG. Of course, any other known method can be used for the blowing method. In the above embodiment, the operation of the shut-off valves 9, 10 and the operations of the first and second extruders 3, 4 are linked to switch the material to be discharged from the parison. For products whose boundaries can be expected to be relatively long, the shut-off valves 9 and 10 are omitted, and only the first and second extruders 3 and 4 are driven and controlled by the control means 11 to obtain a parison having a desired material composition. It is also possible. Next, another embodiment of the apparatus of the present invention will be described with reference to the schematic diagram of FIG. In the following embodiments, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, the opening and closing of the two systems of flow paths through which two kinds of materials flow are performed by moving the mandrel 12 in the longitudinal axis direction without using the shut-off valve. That is, as shown in FIG. 4, the upper part protruding outside the mandrel 12 supported by being movably inserted in the longitudinal direction of the nozzle 6 in the longitudinal axis direction is connected to driving means 13 such as a hydraulic device. This driving means 1
3 is likewise connected to the control means 11. The lower end of the mandrel 12 near the spout 6d has a projection or engaging portion 1 extending over the entire peripheral surface.
4 are formed. Further, at a position spaced slightly above the said projection or the engaging portion 14 at the lower end portion of the inner surface 6b 1 of the inner pipe portion 6b facing the peripheral surface of the mandrel 12, collision is projection or engaging portion 15 It is formed along the inner peripheral surface so as to be able to engage with the portion or the engaging portion 14. Therefore, the first flow path 7 is opened and closed by moving the mandrel in the vertical direction, so that the flow rate of the material flowing therethrough can be adjusted. When a hollow molded article having the structure shown in FIGS. 3A to 3C is manufactured by the apparatus of this embodiment, the first flow path 7 is opened by lowering the mandrel 12 and the second extrusion is performed. What is necessary is just to stop the machine 4 and switch the material. Further, in order to more freely switch the two kinds of materials to be poured, the shut-off valve 10 may be provided only in the flow path 4a of the second extruder 4. Further, the nozzle 6 is configured so that the inner tube portion 6b is movable in the vertical direction.
As shown in FIG. 5, the protrusions 16 and 17 are formed on the outer peripheral surface of the inner tube 6b and the inner peripheral surface of the outer tube 6c forming the second flow path 8 so as to be engageable by raising the inner tube 6b. May be.
In this case, the material to be extracted can be switched sharply by moving the inner tube portion 6b up and down. As described above in detail, according to the present invention, the parison is formed by controlling the pouring of a plurality of types of materials in accordance with the material composition of the product to be molded, so that the parison is formed. A hollow molded article having a corresponding composite material can be easily formed.
Further, since the material ejection can be controlled so that the loss material generated each time a hollow molded article made of a plurality of materials is formed into a single material, the recycling rate of the loss material can be greatly improved. Therefore, a high-quality hollow molded product having a composite material suitable for the purpose can be manufactured at low cost. It should be noted that the present invention is not limited to the embodiment having the above-described characteristics, and it is needless to say that various modifications can be made within the technical scope of the present invention.
【図面の簡単な説明】
【図１】 ３層構造を有する容器Ｃを示した模式的断面
図。
【図２】 本発明の１実施例を示した模式図。
【図３】 本発明に基づいて形成された夫々２種類の材
質を備えた中空成形品（ａ）乃至（ｃ）を示した各説明
図。
【図４】 本発明の他の実施例を示した模式図。
【図５】 図４に示した実施例の変形例を示した説明
図。
【符号の説明】
３ 第１押出機
４ 第２押出機
６ ノズル
７，１８ 第１流路
８，１９ 第２流路
９，１０ シャットオフバルブ
１１ 制御手段
１４〜１７ 係合突部
２０ 第３流路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a container C having a three-layer structure. FIG. 2 is a schematic view showing one embodiment of the present invention. FIG. 3 is an explanatory view showing hollow molded articles (a) to (c) each having two kinds of materials formed according to the present invention. FIG. 4 is a schematic view showing another embodiment of the present invention. FIG. 5 is an explanatory view showing a modification of the embodiment shown in FIG. 4; [Description of Signs] 3 First extruder 4 Second extruder 6 Nozzle 7, 18 First flow path 8, 19 Second flow path 9, 10 Shut-off valve 11 Control means 14 to 17 Engagement projection 20 Third Channel
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｂ２９Ｃ 49/22 Ｂ２９Ｃ 49/22 Ｂ２９Ｌ 9:00 22:00 (56)参考文献 特開 昭51−103158（ＪＰ，Ａ) 特開 昭53−121062（ＪＰ，Ａ) 実開 昭56−45683（ＪＰ，Ｕ) 特公 昭57−53175（ＪＰ，Ｂ２) 米国特許3752617（ＵＳ，Ａ) 米国特許4149839（ＵＳ，Ａ) 「プラスチック」1976年12月号 第35 −44頁，昭和51年12月１日，株式会社工 業調査会発行 (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 49/04 - 49/80────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 6 Identification symbol FI // B29C49 / 22 B29C49 / 22 B29L 9:00 22:00 (56) References JP-A-51-103158 (JP, A JP-A-53-121062 (JP, A) JP-A-56-45683 (JP, U) JP-B-57-53175 (JP, B2) US Patent 3,752,617 (US, A) US Patent 4,498,939 (US, A) "Plastics", December 1976, pp. 35-44, issued by the Industrial Research Institute, Inc. on December 1, 1976. (58) Fields investigated (Int. Cl. 6 , DB name) B29C 49/04- 49/80
Claims (1)
品であって、実質的に第１樹脂材料からなる第１部分
と、前記第１部分に境界面を介して接続しており且つ前
記第１樹脂材料とは異なる第２樹脂材料から実質的にな
る第２部分とを有しており、前記境界面に沿って前記第
１樹脂材料から前記第２樹脂材料へ徐々に変化している
ことを特徴とする中空成形品。 ２．請求項１において、前記境界面が成形品の外側及び
内側の少なくとも一方に対して実質的に傾斜しているこ
とを特徴とする中空成形品。(57) [Claims] A hollow molded product which is basically a single layer and made of a resin material, wherein the first portion is substantially made of a first resin material, and is connected to the first portion via a boundary surface; A second portion substantially composed of a second resin material different from the first resin material, and gradually changing from the first resin material to the second resin material along the boundary surface; A hollow molded article characterized by the following. 2. The hollow molded article according to claim 1, wherein the boundary surface is substantially inclined with respect to at least one of the outside and the inside of the molded article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8155708A JP2781376B2 (en) | 1996-06-17 | 1996-06-17 | Hollow molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8155708A JP2781376B2 (en) | 1996-06-17 | 1996-06-17 | Hollow molded products |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3133790A Division JPH0767730B2 (en) | 1991-03-30 | 1991-03-30 | Hollow molded product manufacturing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0999473A JPH0999473A (en) | 1997-04-15 |
| JP2781376B2 true JP2781376B2 (en) | 1998-07-30 |
Family
ID=15611780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8155708A Expired - Lifetime JP2781376B2 (en) | 1996-06-17 | 1996-06-17 | Hollow molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2781376B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109648819B (en) * | 2019-01-12 | 2024-03-29 | 潍坊中云机器有限公司 | Double-wall corrugated pipe production line |
| JP7470416B2 (en) * | 2020-12-25 | 2024-04-18 | 株式会社プラ技研 | Resin tube extrusion molding device and resin tube |
-
1996
- 1996-06-17 JP JP8155708A patent/JP2781376B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 「プラスチック」１９７６年１２月号 第３５−４４頁，昭和５１年１２月１日，株式会社工業調査会発行 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0999473A (en) | 1997-04-15 |
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| EXPY | Cancellation because of completion of term |