JPH038935B2 - - Google Patents
Info
- Publication number
- JPH038935B2 JPH038935B2 JP57152935A JP15293582A JPH038935B2 JP H038935 B2 JPH038935 B2 JP H038935B2 JP 57152935 A JP57152935 A JP 57152935A JP 15293582 A JP15293582 A JP 15293582A JP H038935 B2 JPH038935 B2 JP H038935B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- plastic
- stretched
- blow
- equipment
- 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
- 229920003023 plastic Polymers 0.000 claims description 24
- 239000004033 plastic Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 11
- 238000000071 blow moulding Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 239000003000 extruded plastic Substances 0.000 claims description 4
- 230000006837 decompression Effects 0.000 claims 1
- 229920000728 polyester Polymers 0.000 description 17
- -1 polypropylene Polymers 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004952 Polyamide Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920001634 Copolyester Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical compound O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000000855 fungicidal effect Effects 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 235000013324 preserved food Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
-
- 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- 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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow 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
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/717—Cans, tins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】
本発明はプラスチツク延伸パイプの連続成形方
法およびその装置に関するものであり、均一かつ
優れた物性を有し、物質輸送用のパイプとして、
また定尺に切断した後端部を蓋でシールして飲食
物たとえば炭酸アルコール飲料、清涼飲料、缶詰
用食品充填用等の容器として有用なプラスチツク
延伸パイプを提供するにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous forming method and apparatus for a plastic stretched pipe, which has uniform and excellent physical properties and can be used as a pipe for transporting materials.
Another object of the present invention is to provide a plastic stretched pipe which is cut to a regular length and whose rear end is sealed with a lid to be useful as a container for filling food and drinks such as carbonated alcoholic beverages, soft drinks, canned food, and the like.
従来、プラスチツクパイプは押出成形機により
原料プラスチツクを溶融混練し、パイプダイから
パイプ状物を押出し、冷却固化して成形されてい
た。このようにして成形されたプラスチツクパイ
プは、パイプを構成する高分子の分子鎖がランダ
ムコイル状あるいは折りたたみ状結晶となり、分
子配向したプラスチツク延伸フイルムの優れた物
性を発揮させることができない欠点を有してい
た。延伸操作によりプラスチツクの物性を向上さ
せる手段は、繊維、フイルム等では常套手段であ
るが、パイプ状物の連続延伸方法としては薄肉の
インフレーシヨン成形か、厚肉パイプでは鋼管等
で実用化されている引抜方法が一部に紹介されて
いるのみであり、工業的に有効な延伸パイプの成
形法は未だ知られていない。 Conventionally, plastic pipes have been molded by melting and kneading raw material plastic using an extruder, extruding the pipe-shaped product from a pipe die, and cooling and solidifying it. Plastic pipes formed in this way have the disadvantage that the molecular chains of the polymer that makes up the pipes are in the form of random coils or folded crystals, making it impossible to exhibit the excellent physical properties of molecularly oriented stretched plastic films. was. Stretching is a common method for improving the physical properties of plastics for fibers, films, etc., but continuous stretching methods for pipe-like materials include thin-walled inflation molding, and thick-walled pipes for steel pipes. Only some drawing methods have been introduced, and an industrially effective method for forming stretched pipes is not yet known.
ポリエステル、ポリプロピレン、ポリアミド、
ポリ塩化ビニル等の延伸パイプを安価に多量に生
産する方法が開発できれば、これらプラスチツク
延伸パイプを素材とした優れた物性を有する缶状
容器を安価に提供することができる。また、これ
らプラスチツク中、特にポリエステルは食品衛生
面からも望ましく、しかも透明容器が得られるた
め、金属缶などでは得られない内容物の可視化も
可能となり、流通面での価値は大きい。 polyester, polypropylene, polyamide,
If a method for producing stretched pipes of polyvinyl chloride or the like in large quantities can be developed at low cost, can-shaped containers made of these plastic stretched pipes and having excellent physical properties can be provided at low cost. Furthermore, among these plastics, polyester is particularly desirable from the viewpoint of food hygiene, and since transparent containers can be obtained, it is possible to visualize the contents, which cannot be achieved with metal cans, etc., and is of great value in terms of distribution.
本発明者等はこれらの点に着目し、プラスチツ
クパイプを連続的に延伸し、均一かつ物性の優れ
た延伸パイプを連続的かつ経済的に得る方法につ
き鋭意研究の結果、本発明に到達した。 The present inventors have focused on these points, and have arrived at the present invention as a result of intensive research into a method for continuously and economically obtaining a stretched pipe with uniform and excellent physical properties by continuously stretching a plastic pipe.
すなわち、本発明は押出し成形されたプラスチ
ツクパイプを冷却後、加圧流体でブロー成形する
プラスチツク延伸パイプの連続成形方法におい
て、冷却領域からブロー成形領域に至るまでのパ
イプ内に気封装置を設けることによりブロー成形
のための圧力による冷却前のパイプの内圧上昇を
防止すると共に、押出し成形されたプラスチツク
パイプの外側を減圧冷却してサイジングし、次い
て延伸温度に調節されたパイプを加圧流体によつ
てブロー延伸することを特徴とするプラスチツク
延伸パイプの連続成形方法およびプラスチツクパ
イプの溶融押出し装置、押出し成形されたパイプ
をサイジングするための減圧、冷却装置、引取装
置、ダイス内を貫通して設けた芯軸に噴気孔を設
けて圧力流体を噴出させる流体噴出装置、噴気孔
よりダイス側の位置に設けたパイプ内壁に接触し
てなる気封装置およびブロー成形型を具備するこ
とを特徴とするプラスチツク延伸パイプの連続成
形装置に関する。 That is, the present invention provides a method for continuously forming a stretched plastic pipe in which an extruded plastic pipe is cooled and then blow-molded using pressurized fluid, in which an air sealing device is provided in the pipe from the cooling area to the blow-molding area. This method prevents an increase in the internal pressure of the pipe before cooling due to the pressure for blow molding, and the outside of the extruded plastic pipe is cooled under reduced pressure for sizing, and then the pipe, which has been adjusted to the drawing temperature, is exposed to pressurized fluid. A continuous forming method for a plastic stretched pipe characterized by blow stretching, a melt extrusion device for a plastic pipe, a vacuum for sizing the extruded pipe, a cooling device, a take-off device, and a device provided through the die. The present invention is characterized by comprising: a fluid ejecting device for ejecting pressurized fluid by providing a blowhole in a core shaft; an air sealing device in contact with the inner wall of the pipe provided at a position closer to the die than the blowhole; and a blow molding die. This invention relates to a continuous forming apparatus for plastic stretched pipes.
本発明によればノズルから減圧冷却に至るまで
のプラスチツク、すなわち溶解状態から固化され
るまでの軟化状態にある部分のパイプ内圧がブロ
ー成形に用いる加圧流体によつて加圧状態となら
ないよう芯軸上に気封装置を設けることにより、
連続的に効率よくしかも均一サイズ、均一横断面
をもつた未延伸パイプが成形でき、それに伴つて
延伸性が改良されると共に均一かつ優れた物性を
有する延伸パイプを得ることができる。 According to the present invention, the inner pressure of the pipe from the nozzle to the vacuum cooling, that is, the part in the softened state from the melted state to the solidified state, is prevented from becoming pressurized by the pressurized fluid used for blow molding. By installing an air sealing device on the shaft,
Undrawn pipes having a uniform size and uniform cross section can be formed continuously and efficiently, and accordingly, stretchability is improved and a stretched pipe having uniform and excellent physical properties can be obtained.
本発明を適用するプラスチツクとしては、ポリ
エステル、ポリプロピレン、ポリカーボネート、
アクリロニトリル共重合体、ポリアミド等の熱可
塑性プラスチツクが例示される。 Plastics to which the present invention is applied include polyester, polypropylene, polycarbonate,
Examples include thermoplastic plastics such as acrylonitrile copolymers and polyamides.
また延伸成形後活性光線や電子線等により硬化
することのできる樹脂に適用することもできる。 It can also be applied to resins that can be cured by actinic rays, electron beams, etc. after stretch molding.
しかし、好ましいプラスチツクはポリエステル
であり、具体的にはポリエチレンテレフタレー
ト、ポリブチレンテレフタレート、ポリシクロヘ
キサンジメチレンテレフタレート、ポリエチレン
ナフタレート、ポリエステルポリエーテルブロツ
ク共重合体、ポリエステルポリラクトンブロツク
共重合体等の他上記ポリエステルの構成単位を主
体としたコポリエステル、上記ポリエステルの混
合体等が例示される。特に好ましいポリエステル
はポリエチレンテレフタレートまたはエチレンテ
レフタレート繰返し単位を80モル％以上含有する
コポリエステルである。また、ポリエステルと他
のプラスチツクのブレンド、積層、異種ポリエス
テルの積層、未着色ポリエステルと着色ポリエス
テルとの積層等であつてもよい。特に高度のガス
バリヤー性を要求される場合、ポリエチレンテレ
フタレート（内層）とメタキシリレン基含有ポリ
アミド、ポリエチレンイソフタレート、アクリロ
ニトリル共重合体等との積層が好ましい。積層は
未延伸パイプ段階で通常行われるが、場合により
延伸パイプに積層することもできる。 However, preferred plastics are polyesters, specifically polyethylene terephthalate, polybutylene terephthalate, polycyclohexane dimethylene terephthalate, polyethylene naphthalate, polyester polyether block copolymers, polyester polylactone block copolymers, and the above polyesters. Examples include copolyesters mainly composed of structural units of , mixtures of the above polyesters, and the like. Particularly preferred polyesters are polyethylene terephthalate or copolyesters containing 80 mol% or more of ethylene terephthalate repeating units. It may also be a blend or laminate of polyester and other plastics, a laminate of different types of polyesters, a laminate of uncolored polyester and colored polyester, or the like. In particular, when high gas barrier properties are required, lamination of polyethylene terephthalate (inner layer) and metaxylylene group-containing polyamide, polyethylene isophthalate, acrylonitrile copolymer, etc. is preferred. Lamination is usually carried out at the undrawn pipe stage, but optionally it can also be laminated to a drawn pipe.
このような場合外層は熱収縮性フイルムであつ
てもよい。更に、積層は延伸パイプを切断した後
行つてもよい。 In such cases the outer layer may be a heat-shrinkable film. Furthermore, lamination may be performed after cutting the elongated pipe.
積層パイプの場合中間に接着剤層を設けてもよ
いのはもちろんである。 Of course, in the case of a laminated pipe, an adhesive layer may be provided in the middle.
なお、プラスチツクには所望により帯電防止
剤、紫外線吸収剤、着色剤、酸化劣化防止剤、滑
剤、有機または無機の結晶化調節剤、防黴剤等の
各種添加剤を配合することができる。積層型のパ
イプの場合には外層（２層以上の積層）または中
間層（３層以上の積層）に配合するのが好まし
い。 In addition, various additives such as an antistatic agent, an ultraviolet absorber, a coloring agent, an oxidative deterioration inhibitor, a lubricant, an organic or inorganic crystallization regulator, and a fungicide can be added to the plastic, if desired. In the case of a laminated pipe, it is preferable to incorporate it into the outer layer (laminated with two or more layers) or the middle layer (laminated with three or more layers).
以下、本発明を図面を用いて詳細に説明する。
第１図は本発明の方法を実施するために使用され
る延伸パイプ連続成形装置の１例を示す説明図で
ある。なお、図ではパイプを円形断面で成形する
装置を示しているが、円形断面に限定されるもの
ではなく多角形等任意の断面形状のパイプが成形
できる。 Hereinafter, the present invention will be explained in detail using the drawings.
FIG. 1 is an explanatory view showing one example of a continuous drawn pipe forming apparatus used to carry out the method of the present invention. Note that although the figure shows an apparatus for forming a pipe with a circular cross section, the apparatus is not limited to a circular cross section and can form a pipe of any cross-sectional shape such as a polygon.
プラスチツクとしてポリエステルを使用した具
体例について説明する。ポリエステルチツプを溶
融押出し装置１のホツパー１ａを投入し、溶解押
出し装置１のシリンダー外周に設けた加熱手段に
よつて溶融し、シリンダー内のスクリユーの回転
によつて押出され、ダイス２に導入される。 A specific example using polyester as the plastic will be explained. Polyester chips are introduced into the hopper 1a of the melt-extrusion device 1, melted by heating means provided on the outer periphery of the cylinder of the melt-extrusion device 1, extruded by the rotation of the screw in the cylinder, and introduced into the die 2. .
ダイス２にはその中心位置にマンドレルを配設
してダイス２の出口部においてポリエステルがパ
イプ状に押出されるように構成する。 A mandrel is disposed at the center of the die 2 so that polyester is extruded into a pipe shape at the outlet of the die 2.
一方該ダイス２の吐出側には押出されたパイプ
をサイジングするための減圧、冷却装置（サイザ
ー）４を取付けダイス２から吐出されたパイプが
サイジングされると共に冷却固化されて所望形状
のパイプ３となる。 On the other hand, a depressurizing and cooling device (sizer) 4 is installed on the discharge side of the die 2 for sizing the extruded pipe, and the pipe discharged from the die 2 is sized and cooled and solidified to form a pipe 3 of a desired shape. Become.
なお、サイザーは通常水によつて冷却されると
同時にサイザーに連結された真空ポンプにより減
圧されており、均一かつ所望の外径となる。サイ
ザーから出たパイプ３は引取装置６により設定さ
れた一定の速度で引取られ、次の温度調節装置７
で延伸適温に調節される。 Note that the sizer is usually cooled with water and at the same time the pressure is reduced by a vacuum pump connected to the sizer, so that the sizer has a uniform and desired outer diameter. The pipe 3 coming out of the sizer is taken off at a constant speed set by a taking-off device 6, and then transferred to the next temperature control device 7.
The stretching temperature is adjusted to the appropriate temperature.
なお延伸適温は使用するプラスチツクの種類や
組成によつても異なるが、ポリエステルの場合ガ
ラス転移点（Tg）以上、好ましくはTgより10〜
80℃高い温度範囲であり、更に好ましくはTgよ
り20〜55℃高い温度範囲である。 The appropriate stretching temperature varies depending on the type and composition of the plastic used, but in the case of polyester, it should be at least the glass transition point (Tg), preferably 10 to 10° below Tg.
The temperature range is 80°C higher, and more preferably the temperature range is 20 to 55°C higher than Tg.
延伸適温に調節されたパイプ３は次いでブロー
成形型１０内に導かれる。ここでダイス２内を貫
通する中空の芯軸８をパイプ内に設け、更に金型
内に延びた芯軸に設けられた加圧流体の噴気孔９
から加圧流体（たとえば空気）を噴出させること
によりパイプ３は金型形状にブロー成形されて延
伸パイプが製造される。この際、ブロー成形にお
ける内圧がダイス２より押出された冷却固化前の
パイプ部分にかからないよう気封装置１１を設け
る。冷却固化前のパイプ部にブロー成形のための
内圧がおよぶとパイプが破れ成形不能となる。 The pipe 3, which has been adjusted to an appropriate stretching temperature, is then introduced into a blow mold 10. Here, a hollow core shaft 8 penetrating through the inside of the die 2 is provided in the pipe, and a blowhole 9 for pressurized fluid is provided in the core shaft extending into the mold.
The pipe 3 is blow-molded into a mold shape by jetting pressurized fluid (for example, air) from the pipe 3 to produce an elongated pipe. At this time, an air sealing device 11 is provided so that the internal pressure during blow molding does not apply to the pipe portion extruded from the die 2 before being cooled and solidified. If internal pressure for blow molding is applied to the pipe section before it is cooled and solidified, the pipe will break and become impossible to mold.
このため気封装置１１の位置はパイプが冷却固
化する領域から噴気孔（ブロー成形領域）に至る
までのパイプ内であればよい。なお、温度調節装
置による加熱はパイプ内に設置したヒーター等で
行うこともできる。 Therefore, the air sealing device 11 may be located within the pipe from the region where the pipe is cooled and solidified to the blowhole (blow molding region). Note that the heating by the temperature control device can also be performed by a heater installed inside the pipe.
次に気封装置を説明する。第２図は第１図にお
ける延伸成形装置のＡ−A′面における断面図す
なわち気封装置とパイプの関係を示す断面図であ
る。芯軸８とパイプ３との間に気封装置１１が介
在し気密性が付与される。気封装置１１は芯軸上
に固定され、外面がパイプ内壁と接触している。 Next, the air sealing device will be explained. FIG. 2 is a cross-sectional view taken along line A-A' of the stretch-forming device in FIG. 1, that is, a cross-sectional view showing the relationship between the air sealing device and the pipe. An air sealing device 11 is interposed between the core shaft 8 and the pipe 3 to provide airtightness. The air sealing device 11 is fixed on the core shaft, and its outer surface is in contact with the inner wall of the pipe.
気封装置の材質は弾性体が好ましいが、更に材
質は１１ａ，１１ｂにわけ、１１ａを剛性体、１
１ｂを弾性体で構成するのが特に好ましい。 The material of the air sealing device is preferably an elastic body, but the material is further divided into 11a and 11b, with 11a being a rigid body and 1 being a rigid body.
It is particularly preferable that 1b be made of an elastic body.
なお、１２はブロー成形のための内圧を保持す
る気封装置である。 Note that 12 is an air sealing device that maintains internal pressure for blow molding.
以上図示例はこれらの装置を水平方向に配列し
た例を示しているが、垂直方向に配列しても同様
に実施することができる。 Although the illustrated example above shows an example in which these devices are arranged in the horizontal direction, the same implementation is possible even if they are arranged in the vertical direction.
かくして得られた延伸パイプは偏肉もなく均一
かつ優れた物性を有しており、物質輸送用のパイ
プとしてはもちろんのこと、定長に切断し端部に
蓋を固着または巻締めしてプラスチツク缶を製造
するのに特に有用である。 The stretched pipe thus obtained has no uneven thickness, is uniform, and has excellent physical properties, and can be used not only as a pipe for transporting materials, but also as a plastic pipe by cutting it into a fixed length and fixing or wrapping a lid to the end. It is particularly useful for making cans.
第１図は本発明の方法を実施するために使用さ
れる延伸パイプ連続成形装置の１例を示す説明図
である。また第２図は第１図の装置のＡ−A′面
における断面図である。
１……溶融押出し装置、２……ダイス、３……
パイプ、４……減圧冷却装置、５……真空ポン
プ、６……引取装置、７……温度調節装置、８…
…芯軸、９……噴気孔、１０……ブロー成形型、
１１……気封装置。
FIG. 1 is an explanatory view showing one example of a continuous drawn pipe forming apparatus used to carry out the method of the present invention. FIG. 2 is a sectional view taken along line A-A' of the device shown in FIG. 1... Melt extrusion device, 2... Dice, 3...
Pipe, 4...Reduced pressure cooling device, 5...Vacuum pump, 6...Take-up device, 7...Temperature adjustment device, 8...
... core shaft, 9 ... fumarole, 10 ... blow molding mold,
11... Air sealing device.
Claims (1)
後、加圧流体でブロー成形するプラスチツク延伸
パイプの連続成形方法において、冷却領域からブ
ロー成形領域に至るまでのパイプ内に気封装置を
設けることにより冷却前のパイプの内圧上昇を防
止すると共に、押出し成形されたプラスチツクパ
イプの外側を減圧冷却してサイジングし、次いで
延伸温度に調節されたパイプを加圧流体によつて
ブロー延伸することを特徴とするプラスチツク延
伸パイプの連続成形方法。 ２ プラスチツクパイプの溶融押出し装置、押出
し成形されたパイプをサイジングするための減
圧、冷却装置、引取装置、ダイス内を貫通して設
けた芯軸に噴気孔を設けて圧力流体を噴出させる
流体噴出装置、噴気孔よりダイス側の位置に設け
たパイプ内壁に接触してなる気封装置およびブロ
ー成形型を具備することを特徴とするプラスチツ
ク延伸パイプの連続成形装置。[Claims] 1. In a continuous forming method for plastic stretched pipe in which an extruded plastic pipe is cooled and then blow-molded using pressurized fluid, an air sealing device is provided in the pipe from the cooling area to the blow-molding area. By providing this, an increase in the internal pressure of the pipe before cooling is prevented, and the outside of the extruded plastic pipe is cooled under reduced pressure for sizing, and then the pipe, which has been adjusted to the drawing temperature, is blow-stretched using pressurized fluid. A continuous forming method for plastic stretched pipe characterized by: 2. Plastic pipe melt extrusion equipment, decompression and cooling equipment for sizing extruded pipes, cooling equipment, take-off equipment, and fluid jetting equipment that spouts pressurized fluid by providing blowholes in the core shaft provided through the die. 1. An apparatus for continuously forming a stretched plastic pipe, characterized in that it is equipped with an air sealing device that is in contact with the inner wall of the pipe and is provided at a position closer to the die than the blowhole, and a blow mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57152935A JPS5941232A (en) | 1982-09-02 | 1982-09-02 | Method and apparatus for continuously molding plastic stretched pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57152935A JPS5941232A (en) | 1982-09-02 | 1982-09-02 | Method and apparatus for continuously molding plastic stretched pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5941232A JPS5941232A (en) | 1984-03-07 |
| JPH038935B2 true JPH038935B2 (en) | 1991-02-07 |
Family
ID=15551356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57152935A Granted JPS5941232A (en) | 1982-09-02 | 1982-09-02 | Method and apparatus for continuously molding plastic stretched pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5941232A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6228888A (en) * | 1985-07-31 | 1987-02-06 | Fuji Electric Co Ltd | Method for discriminating object |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5386761A (en) * | 1977-01-12 | 1978-07-31 | Mitsui Petrochemical Ind | Pipe making method |
| JPS5795423A (en) * | 1980-12-06 | 1982-06-14 | Toyobo Co Ltd | Apparatus for continuously making cylindrical body |
-
1982
- 1982-09-02 JP JP57152935A patent/JPS5941232A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5386761A (en) * | 1977-01-12 | 1978-07-31 | Mitsui Petrochemical Ind | Pipe making method |
| JPS5795423A (en) * | 1980-12-06 | 1982-06-14 | Toyobo Co Ltd | Apparatus for continuously making cylindrical body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5941232A (en) | 1984-03-07 |
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