JPH039851B2 - - Google Patents
Info
- Publication number
- JPH039851B2 JPH039851B2 JP57215244A JP21524482A JPH039851B2 JP H039851 B2 JPH039851 B2 JP H039851B2 JP 57215244 A JP57215244 A JP 57215244A JP 21524482 A JP21524482 A JP 21524482A JP H039851 B2 JPH039851 B2 JP H039851B2
- Authority
- JP
- Japan
- Prior art keywords
- blow molding
- mold
- heat
- cylindrical member
- temperature
- 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
- 238000000071 blow moulding Methods 0.000 claims description 35
- 238000009998 heat setting Methods 0.000 claims description 25
- 239000002826 coolant Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 238000007789 sealing Methods 0.000 description 11
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 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
- 239000004952 Polyamide Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 210000003027 ear inner Anatomy 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 235000013324 preserved food Nutrition 0.000 description 1
- 238000000926 separation method Methods 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
- B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
-
- 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は延伸筒状部材の熱固定方法に関し、特
に熱可塑性合成樹脂の延伸ブロー成形物を無限軌
条型連続金型（以下キヤタピラ型連続金型とい
う）に導入して熱固定する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for heat fixing a stretched cylindrical member, and in particular to a method for heat-setting a stretched cylindrical member, in particular, by introducing a stretch blow molded product of a thermoplastic synthetic resin into an endless track type continuous mold (hereinafter referred to as a track type continuous mold). Concerning a method of heat setting.
本出願人は先に飲食物即ち炭配アルコール飲
料，清飲料水や缶詰、瓶詰用食品等を収納するた
めの容器類としてプラスチツクの筒状部材を利用
すればよいことに着目して、これら筒状部材の製
造方法並びに製造装置を開発し、第２〜４図に示
す成形装置の出願を行なつた。ところがこの様な
装置であると、延伸成形物を軸方向へ引き取る引
き取り装置１３及びヒートセツト装置１４を別体
に構成しておかなければならない。しかもこのヒ
ートセツト装置１４は固定タイプであるため、引
取速度や材料の変化に適確に追随して熱固定条件
を広範囲に調整することができないという問題が
あつた。一方製造に当つては生産性を高め、しか
も特定寸法にするためのブロー成形手段を提案す
ると共に、延伸ブロー成形においても金型をキヤ
タピラ型連続金型とし、延伸速度と金型循環速度
とをほぼ一致させて行なう製造手段も提案した。
しかしながら上記提案では、キヤタピラ型連続金
型を利用して熱可塑性合成樹脂特にポリエステル
の延伸筒状部材を熱固定するに当つては、上記キ
ヤタピラ型連続金型の下流側に前記固定タイプの
ヒートセツト装置を設ける様に設計されており、
延伸ブロー成形の速度や材料等の変化に対応した
熱固定処理が適確に行なえず、一定性状の筒状部
材を連続的に製造できるものではなかつた。 The applicant first focused on the fact that plastic cylindrical members could be used as containers for storing food and drinks, such as alcoholic beverages, clean drinking water, canned food, bottled food, etc. We developed a method and apparatus for manufacturing shaped members, and filed an application for the molding apparatus shown in Figures 2-4. However, in such an apparatus, the take-off device 13 for taking up the stretched product in the axial direction and the heat-setting device 14 must be constructed separately. Furthermore, since the heat setting device 14 is of a fixed type, there is a problem in that it is not possible to adjust the heat setting conditions over a wide range by accurately following changes in take-up speed or material. On the other hand, in manufacturing, we proposed a blow molding method to increase productivity and achieve specific dimensions.In addition, we used a continuous caterpillar mold for stretch blow molding, and adjusted the stretching speed and mold circulation speed. We also proposed a manufacturing method that allows for nearly matching.
However, in the above proposal, when heat setting a stretched cylindrical member of thermoplastic synthetic resin, particularly polyester, using a continuous caterpillar mold, the fixing type heat setting device is installed downstream of the continuous caterpillar mold. It is designed to provide
Heat-setting treatment that corresponds to changes in stretch blow molding speed, material, etc. cannot be performed appropriately, and cylindrical members with constant properties cannot be continuously manufactured.
本発明はこれらについて研究した結果完成した
もので、押出成形によつて成形された管状部材を
ブロー成形法によつて延伸成形して得られた延伸
筒状部材を、熱固定温度範囲に加熱されたキヤタ
ピラ型連続金型に導入し、内圧を加えた状態で熱
固定すると共に、該キヤタピラ金型の成形物取出
側において冷却媒体により筒状部材を冷却する様
にしたものである。 The present invention was completed as a result of research on these issues. A stretched tubular member obtained by stretch-molding a tubular member formed by extrusion molding using a blow molding method is heated to a heat-setting temperature range. The cylindrical member is introduced into a caterpillar-type continuous mold and heat-set under internal pressure, and the cylindrical member is cooled by a cooling medium on the molded article exit side of the caterpillar mold.
第２〜４図は従来の装置例を示す図面である。
第１図（見取図）は製造する短筒状材１を示し、
第２図（概略側面図）は該筒状材１を連続的に製
造する設備を示している。即ちこの製造設備は上
部側から押出装置２、ダイス６、温度調節装置
８、ブロー成形装置９、引取装置１３、ヒートセ
ツト装置１４、必要によつて２次引取装置（図示
せず）及び切断装置（図示せず）から構成されて
おり、押出装置２のホツパー３に熱可塑性樹脂ペ
レツトを投入する。尚好ましい樹脂剤としてはポ
リエステル例えばポリエ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、
エチレンテレフタレート繰り返し単位80モル％以
上含有する共重合ポリエステル等、ポリピレン、
ポリアミド等が挙げられるが、特にポリエステル
が好ましい。又複数の樹脂の積層等であつてもよ
い。またこれらの樹脂には所望により帯電防止
剤、紫外線吸収剤等の添加剤又は改質剤を配合す
る。そしてこれらの樹脂はシリンダ４の外周に配
置された加熱手段によつて溶融し、スクリユー５
の回転によつて押し出され、ダイス６に導入され
る。ダイス６としては図示する様に屈曲案内型で
あつて、その導孔６ａがほぼ90度屈曲したもので
あることが推奨される。しかし一連の装置を平面
的に設備した装置であつてもよい。そして導孔６
ａの垂直部側にはその中心位置に芯軸７を配設し
てダイス６の出口部においてパイプ状の樹脂が押
し出される様になつている。一方このダイス６の
吐出側には、導孔６ａと連通する透孔を形成した
温度調節装置８を設けており、ダイス６から押し
出されたパイプ状樹脂材を、次に行なうブロー成
形に適当する温度に調整する。従つて該温度調節
装置８には温度検査部材を設けて導入されるパイ
プ状樹脂材の温度を検出し、冷却により温調する
ときは冷却媒体、加熱により温調するときは加熱
媒体の温度を制御して特定温度範囲に調節する。
９はブロー成形装置であつて、図は温度調節装置
８に接続されたものを示したが必要によつては前
記ダイス６に接続させてもよい。ブロー成形装置
９は、第３図（側断面図）に示す様に拡径成形内
面１０を形成しており、拡径状態のまま下部側に
開放されている。一方ダイス６及び温度調節装置
８の透孔を貫通して芯軸７が設けられており、こ
の芯軸７はブロー成形装置９内にも延びている。
そしてその成形内面１０の開放側部に気封装置１
１を支持している。気封装置１１としてはドラム
の周辺に多数列の突条を形成し、成形内面１０と
の間に間隙１２を形成している。他方芯軸７には
その中心に送気路７ａを形成しており、この送気
路７ａは気封装置１１の上部側において開口部７
ｂを成形している。またこの開口部７ｂはその噴
気を成形内面１０の拡径部に指向する様に形成さ
れてパイプ状樹脂材をブロー成形し、引取装置１
３によつて引き出される。この際引取速度を大き
くして軸方向の延伸を積極的に行ないながら引き
取るのが好ましい。１４はヒートセツト装置で加
熱部１５と冷却部１６で構成される。また引取装
置１３としては例えば第４図（一部破断断面図）
に示すように芯軸７の下端側に案内胴７ｃを設け
ると共にこれを囲んで引取装置１３が設けられて
おり、案内胴７ｃ内に設けられ外周面と一致する
様に配置された滑車１７と対応して引取ベルト１
８が引取装置１３側に設けられて構成されてい
る。そしてこの引取ベルト１８はモータ１８ａに
よつて全部（図では４組）が駆動され、ブロー成
形されたパイプ状樹脂材を延伸しながら引き出し
てヒートセツト装置１４に送り込み、切断装置
（図示せず）によつて第１図のごとき短筒状材１
を製造する。 2 to 4 are drawings showing examples of conventional devices.
FIG. 1 (schematic drawing) shows a short cylindrical material 1 to be manufactured,
FIG. 2 (schematic side view) shows equipment for continuously manufacturing the cylindrical material 1. That is, this manufacturing equipment includes, from the top side, an extrusion device 2, a die 6, a temperature control device 8, a blow molding device 9, a pulling device 13, a heat setting device 14, and if necessary a secondary pulling device (not shown) and a cutting device ( (not shown), and the thermoplastic resin pellets are fed into the hopper 3 of the extrusion device 2. Preferred resin agents include polyesters such as polyethylene terephthalate,
polycyclohexane dimethylene terephthalate,
Copolymerized polyester containing 80 mol% or more of ethylene terephthalate repeating units, polypyrene, etc.
Examples include polyamide, but polyester is particularly preferred. Alternatively, it may be a laminate of a plurality of resins. Additionally, additives or modifiers such as antistatic agents and ultraviolet absorbers may be added to these resins, if desired. These resins are then melted by heating means arranged around the outer periphery of the cylinder 4, and are heated to the screw 5.
is extruded by the rotation of and introduced into the die 6. It is recommended that the die 6 be of a bent guide type as shown in the figure, with its guide hole 6a bent at approximately 90 degrees. However, it may be a device in which a series of devices are installed in a planar manner. and guide hole 6
A core shaft 7 is disposed at the center of the vertical portion of a, so that a pipe-shaped resin is extruded at the outlet of the die 6. On the other hand, on the discharge side of this die 6, there is provided a temperature control device 8 having a through hole communicating with the guide hole 6a, which controls the pipe-shaped resin material extruded from the die 6 to be suitable for the next blow molding. Adjust to temperature. Therefore, the temperature control device 8 is provided with a temperature inspection member to detect the temperature of the introduced pipe-shaped resin material, and to check the temperature of the cooling medium when the temperature is controlled by cooling, and of the heating medium when the temperature is controlled by heating. Controlled and adjusted to a specific temperature range.
Reference numeral 9 denotes a blow molding device, which is shown connected to the temperature control device 8 in the figure, but may be connected to the die 6 if necessary. As shown in FIG. 3 (side sectional view), the blow molding device 9 has a diameter-enlarged molded inner surface 10, which is open to the lower side while the diameter is in the enlarged state. On the other hand, a core shaft 7 is provided passing through the through holes of the die 6 and the temperature adjustment device 8, and this core shaft 7 also extends into the blow molding device 9.
An air sealing device 1 is attached to the open side of the molded inner surface 10.
1 is supported. As the air sealing device 11, multiple rows of protrusions are formed around the drum, and a gap 12 is formed between the drum and the molded inner surface 10. On the other hand, the core shaft 7 has an air passage 7a formed at its center, and this air passage 7a is connected to the opening 7 on the upper side of the air sealing device 11.
b is molded. Further, the opening 7b is formed so as to direct the fumes toward the enlarged diameter part of the molded inner surface 10, and the pipe-shaped resin material is blow-molded.
3. At this time, it is preferable to increase the take-up speed and actively draw the film in the axial direction. Reference numeral 14 denotes a heat set device which is composed of a heating section 15 and a cooling section 16. In addition, as the take-up device 13, for example, FIG. 4 (partially broken sectional view)
As shown in the figure, a guide cylinder 7c is provided on the lower end side of the core shaft 7, and a pulling device 13 is provided surrounding the guide cylinder 7c. Correspondingly, take-back belt 1
8 is provided on the take-off device 13 side. All of the take-up belts 18 (four sets in the figure) are driven by a motor 18a, and the blow-molded pipe-shaped resin material is pulled out while being stretched, sent to the heat-setting device 14, and then transferred to a cutting device (not shown). Therefore, a short cylindrical material 1 as shown in Fig. 1
Manufacture.
ところでこの様なブロー成形並びに引取装置で
はブロー成形と引き取りが個別に行なわれ、ブロ
ー成形時における拡径成形面での摩擦が均一でな
く、しかもヒートセツト装置１４は別体で固定的
に設けられ、熱固定の温度条件、処理時間条件等
の調節が限られた範囲に止まるという問題があつ
た。 However, in such a blow molding and take-off device, blow molding and take-off are performed separately, and the friction on the diameter expanding molding surface during blow molding is not uniform, and the heat setting device 14 is provided separately and fixedly. There was a problem in that the temperature conditions, treatment time conditions, etc. for heat fixation could only be adjusted within a limited range.
以下本発明の代表的な実施例を説明する。キヤ
タピラ型ブロー成形金型１９は第５図に示した様
に第２図のブロー成形装置９に代つて設けられる
ものであつて、引取装置１３を省略することがで
き設備を簡略化できる。またこの様な金型を利用
することによつて延伸ブロー成形を段階的に行な
うことができる。例えば第２図の設備において引
取装置１３をこのキヤタピラ型連続金型１９とす
れば、ブロー成形を図示した装置９で行ない、続
いてキヤタピラ型連続金型１９を熱固定手段とし
て利用でき高品質の短筒状材１が得られる。第５
図（側面略図）はこのキヤタピラ型ブロー成形金
型装置１９を延伸ブロー成形手段として利用した
場合を示し、第６図は第５図の右側面でいずれも
要部を破断して示している。すなわちブロー成形
を第５図に示したキヤタピラ型ブロー成形金型装
置１９で行ない、更に別のキヤタピラ型連続金型
を連設して熱固定を行なつてもよい。 Typical embodiments of the present invention will be described below. As shown in FIG. 5, the caterpillar type blow molding mold 19 is provided in place of the blow molding apparatus 9 shown in FIG. 2, and the take-off device 13 can be omitted and the equipment can be simplified. Further, by using such a mold, stretch blow molding can be carried out in stages. For example, if this caterpillar type continuous mold 19 is used as the take-off device 13 in the equipment shown in FIG. A short cylindrical material 1 is obtained. Fifth
The figure (schematic side view) shows the case where this caterpillar type blow molding mold device 19 is used as a stretch blow molding means, and FIG. 6 shows the right side of FIG. 5 with essential parts cut away. That is, blow molding may be performed using a caterpillar type blow molding mold device 19 shown in FIG. 5, and another continuous caterpillar mold may be provided in series for heat setting.
キヤタピラ型延伸ブロー成形金型装置１９は第
７図（側断面図）に示すように、箱体２０の内側
にブロー成形パイプ部材の通過軌跡を囲んで側に
駆動チエーン２１，２１を配設すると共にこのチ
エーン２１にそれぞれ半裁形の金型２２を隣接す
るように取り付けて構成し、箱体２０の頂部側に
パイプ部材の導入部２０ａ、底部側に取出孔２０
ｂ（第５図）を形成し、側面にチエーン駆動部２
０ｃを形成すると共に他方側面上部に金型温調用
熱媒体導入部２０ｄを設けている。そして金型装
置１９は第８図（第７図の切断線−矢印方向
断面図）に示す様に両方のチエーンにそれぞれ設
けられた半裁金型２２が互いに合致されて円筒形
の外金型を形成するように構成されており、互い
に矢印方向に等速度で移動するものである。従つ
て合致した金型２２の垂直状の通路がブロー成形
金型となり、しかもこの金型２２は矢印方向に移
動するのでブロー成形されたパイプ状部材を積極
的に取出孔２０ｂ方向へ送り出すと共に互いに離
れて成形物を離脱させる。またブロー成形に当つ
ては、第９図（要部拡大説明図）に示すように前
第７図で示した芯軸７を貫いて吊索２３を設ける
と共にその下端にシール部材２４を取り付け、該
シール部材２４を前記半裁金型２２の離脱部近く
に配置する。なお、ブロー成形においては加熱温
度、気体圧力が重要であり、これらの条件が適切
でないと均一な肉厚製品を得ることができない。
このためブロー成形延伸部に加熱装置２５を配設
すると共に前記箱体２０内を温調するのが好まし
い。そしてブロー成形用圧力気体は前記芯軸７を
貫いた通気路から矢印のごとく導入する。尚キヤ
タピラ型連続金型を前記ブロー成形装置９に続い
て熱固定の手段として構成するときは、前第４図
において示した案内胴７ｃにも通気路を連通して
構成し、該通気路を含めた芯軸７を形成して吊索
２３を設ける。また熱固定をキヤタピラ型連続金
型で行なう場合前記シール部材２４の下部に更に
吊索を設け内圧を加えるシール部材を設ければよ
い。またシール部材２４は省略してキヤタピラ型
連続金型の出口部にシール部材を設けブロー成形
時の内圧と熱固定時の内圧を同じ圧力にしてもよ
い。ところでこの様なキヤタピラ型連続金型を熱
固定に利用するに当つては、その加熱温度および
時間が問題であり、これらの条件が適切でないと
よい製品が得られない。このため本発明では第９
図に示したキヤタピラ型延伸ブロー成形金型入口
部前に設けた加熱装置２５と同様の加熱装置をキ
ヤタピラ型連続金型入口部前に配設すると共に第
７図同様の箱体を設け箱体内に加熱媒体を導入若
しくは循環させてキヤタピラ型連続金型を熱固定
温度範囲に調節する。熱固定温度は用いる熱可塑
性樹脂の種類、引取速度、金型の長さ等によつて
も異なるが、通常120〜230℃（ポリエステルでは
好ましくは150〜200℃）の範囲に維持すると共に
通常内圧をブロー成形用気体圧とほぼ同じとする
ものである。しかし必ずも同一でなくてもよく要
は熱固定温度条件で変形が防止されればよい。尚
ブロー成形用気体圧としては通常２Kg／cm2〜５
Kg／cm2の気体を用いる。またこの圧力を調整する
に当つては、シール部材の材質並びに外周突条山
数（ラビリンス）を増減したり或いはリングパツ
キングの形状や配設数を変更して調整すればよ
い。また本発明では、キヤタピラ型連続金型を利
用するに当つて、その取出部に冷却装置を配設し
て行なうもので、第９図に示すごとく連続合わせ
金型の離脱部分に延伸筒状部材を取り囲むように
冷却装置２６を設けるものである。そして冷却装
置２６としては冷却媒体導入パイプを連接した円
形パイプの頂面側に複数のノズル２６ａを設け、
該ノズル２６ａを成形物の金型離脱部にそれぞれ
指向させて冷却媒体を吹き付ける様に構成する。 As shown in FIG. 7 (side sectional view), the caterpillar type stretch blow mold device 19 has drive chains 21, 21 disposed inside a box 20 surrounding the passage path of the blow molding pipe member. At the same time, half-shaped molds 22 are attached to each of the chains 21 so as to be adjacent to each other, and an introduction part 20a for the pipe member is provided on the top side of the box body 20, and an ejection hole 20 is provided on the bottom side of the box body 20.
b (Fig. 5), and the chain drive part 2 is attached to the side.
0c, and a heat medium introduction part 20d for mold temperature adjustment is provided on the upper side of the other side. As shown in FIG. 8 (cross-sectional view in the direction of the cutting line--arrow in FIG. 7), the mold device 19 has half-cut molds 22 provided in both chains aligned with each other to form a cylindrical outer mold. They are configured to form a shape, and move at a constant speed in the direction of the arrow. Therefore, the vertical passages of the matching molds 22 become blow molding molds, and since the molds 22 move in the direction of the arrow, the blow molded pipe-shaped members are actively sent out toward the extraction hole 20b and also mutually Separate the molded product. In addition, for blow molding, as shown in FIG. 9 (enlarged explanatory view of the main part), a suspension rope 23 is provided passing through the core shaft 7 shown in the previous FIG. 7, and a sealing member 24 is attached to the lower end of the suspension rope 23. The sealing member 24 is arranged near the detachment portion of the half-cut mold 22. In blow molding, heating temperature and gas pressure are important, and unless these conditions are appropriate, a product with uniform thickness cannot be obtained.
For this reason, it is preferable to provide a heating device 25 in the blow molding stretching section and to control the temperature inside the box 20. Pressure gas for blow molding is introduced from the air passage passing through the core shaft 7 as shown by the arrow. In addition, when a caterpillar type continuous mold is configured as a heat fixing means following the blow molding device 9, an air passage is also configured to communicate with the guide cylinder 7c shown in FIG. 4, and the air passage is A hanging rope 23 is provided by forming a core shaft 7 including the core shaft 7. Further, when heat setting is carried out using a caterpillar type continuous mold, a hanging rope may be further provided below the sealing member 24 to provide a sealing member for applying internal pressure. Alternatively, the sealing member 24 may be omitted and a sealing member may be provided at the outlet of the caterpillar type continuous mold so that the internal pressure during blow molding and the internal pressure during heat setting are the same. However, when using such a continuous caterpillar mold for heat setting, there are problems with the heating temperature and time, and unless these conditions are appropriate, good products cannot be obtained. Therefore, in the present invention, the ninth
A heating device similar to the heating device 25 installed in front of the inlet of the caterpillar type stretch blow mold shown in the figure is installed in front of the inlet of the caterpillar type continuous mold, and a box body similar to that shown in Fig. 7 is provided inside the box. The caterpillar type continuous mold is adjusted to the heat-setting temperature range by introducing or circulating a heating medium. The heat setting temperature varies depending on the type of thermoplastic resin used, take-up speed, mold length, etc., but is usually maintained within the range of 120 to 230°C (preferably 150 to 200°C for polyester) and at normal internal pressure. is approximately the same as the gas pressure for blow molding. However, they do not necessarily have to be the same, as long as deformation can be prevented under heat-setting temperature conditions. The gas pressure for blow molding is usually 2Kg/cm2 to 5
Kg/cm 2 of gas is used. Further, this pressure can be adjusted by increasing or decreasing the material of the sealing member and the number of protruding threads (labyrinths) on the outer periphery, or by changing the shape and number of ring packings. In addition, in the present invention, when a caterpillar type continuous mold is used, a cooling device is provided at the ejection part of the continuous mold, and as shown in FIG. A cooling device 26 is provided so as to surround the. As the cooling device 26, a plurality of nozzles 26a are provided on the top side of a circular pipe to which the cooling medium introduction pipe is connected.
The nozzles 26a are configured to direct the cooling medium to the mold separation portions of the molded product.
本発明は筒状部材を前記したように延伸適温に
加熱して延伸ブロー成形すると共に得られた延伸
筒状部材を加熱されたキヤタピラ型連続金型内で
内圧を加えた状態で行なうようにし、成形物の冷
却は該キヤタピラ型連続金型の成形物取出部にお
いて冷却媒体により行なうようにしたから、熱固
定処理を行なう軸方向の距離が確保され、比較的
低温域で十分な処理が行なえる様になると共に、
連続金型の温度調節により、引抜き速度の変化等
に対応して広い範囲での熱固定処理が可能であ
り、しかも内圧をかけた状態で熱固定処理される
ので、管の変形は極力制御され、延伸ブロー成形
および熱固定を確実に行なうことができ、高品質
の延伸短筒状部材を得ることができるようになつ
た。 In the present invention, a cylindrical member is heated to an appropriate stretching temperature and then stretch-blow molded as described above, and the obtained stretched cylindrical member is subjected to internal pressure in a heated caterpillar-type continuous mold, Since the molded product is cooled by a cooling medium at the molded product take-out part of the caterpillar type continuous mold, a sufficient distance in the axial direction for heat setting treatment is secured, and sufficient treatment can be performed at a relatively low temperature range. As it becomes like
By controlling the temperature of the continuous mold, it is possible to perform heat setting over a wide range in response to changes in drawing speed, etc. Moreover, since heat setting is performed with internal pressure applied, deformation of the tube is controlled as much as possible. , it has become possible to reliably perform stretch blow molding and heat setting, and to obtain high quality stretched short cylindrical members.
第１図は短筒状部材の見取図、第２図は従前の
短筒状部材製造設備を説明する概略側面図、第３
図は延伸ブロー成形装置の側断面図、第４図は引
取装置の一部破断平面図、第５図は本発明を利用
するキヤタピラ型延伸ブロー成形装置の側面図、
第６図は第５図の右側面図でそれぞれ一部を破断
して示す。第７図は第５図の一部拡大断面図、第
８図は第７図の切断線−に沿う矢印方向断面
図、第９図は第７図の要部拡大説明図である。
１…短筒状材、２…押出装置、３…ホツパー、
４…シリンダ、５…スクリユー、６…ダイス、７
…芯軸、８…温度調節装置、９…ブロー成形装
置、１０…拡径成形内面、１１…気封装置、１２
…間隙、１３…引取装置、１４…ヒートセツト装
置、１５…加熱部、１６…冷却部、１７…滑車、
１８…引取ベルト、１９…キヤタピラ型ブロー成
形装置、２０…箱体、２１…チエーン、２２…半
裁金型、２３…吊索、２４…シール部材、２５…
加熱装置、２６…冷却装置。
Fig. 1 is a sketch of a short cylindrical member, Fig. 2 is a schematic side view illustrating the conventional short cylindrical member manufacturing equipment, and Fig. 3
The figure is a side sectional view of a stretch blow molding device, FIG. 4 is a partially cutaway plan view of a take-off device, and FIG. 5 is a side view of a caterpillar type stretch blow molding device using the present invention.
FIG. 6 is a right side view of FIG. 5, with each part cut away. 7 is a partially enlarged sectional view of FIG. 5, FIG. 8 is a sectional view taken along the cutting line - in FIG. 7 in the direction of the arrow, and FIG. 9 is an enlarged explanatory view of the main part of FIG. 1... Short cylindrical material, 2... Extrusion device, 3... Hopper,
4...Cylinder, 5...Screw, 6...Dice, 7
... Core shaft, 8 ... Temperature adjustment device, 9 ... Blow molding device, 10 ... Diameter expansion molding inner surface, 11 ... Air sealing device, 12
... Gap, 13... Pulling device, 14... Heat setting device, 15... Heating section, 16... Cooling section, 17... Pulley,
18... Take-up belt, 19... Caterpillar type blow molding device, 20... Box body, 21... Chain, 22... Half cut mold, 23... Suspension rope, 24... Seal member, 25...
Heating device, 26...Cooling device.
Claims (1)
状部材を延伸適温に調整し、延伸ブロー成形して
得られた延伸筒状部材を、熱固定温度範囲に加熱
された無限軌条型連続金型内に導入し、内圧を加
えた状態で熱固定すると共に、該筒状部材を連続
的に引き取り、該無限軌条型連続金型の筒状部材
取出側において冷却媒体により該筒状部材を冷却
することを特徴とする延伸筒状部材の熱固定方
法。1 A plastic tubular member formed by extrusion molding is adjusted to an appropriate temperature for stretching, and the stretched tubular member obtained by stretch blow molding is introduced into an endless track type continuous mold heated to a heat-setting temperature range. The method is characterized in that the cylindrical member is heat-fixed under applied internal pressure, the cylindrical member is continuously taken out, and the cylindrical member is cooled with a cooling medium on the cylindrical member take-out side of the endless track type continuous mold. A method for heat fixing a stretched cylindrical member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21524482A JPS59104917A (en) | 1982-12-07 | 1982-12-07 | Heat-setting method of stretched cylindrical member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21524482A JPS59104917A (en) | 1982-12-07 | 1982-12-07 | Heat-setting method of stretched cylindrical member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59104917A JPS59104917A (en) | 1984-06-18 |
| JPH039851B2 true JPH039851B2 (en) | 1991-02-12 |
Family
ID=16669103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21524482A Granted JPS59104917A (en) | 1982-12-07 | 1982-12-07 | Heat-setting method of stretched cylindrical member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104917A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2444096C (en) | 2003-10-01 | 2007-05-08 | Manfred A. A. Lupke | Externally cooled moving mold |
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
- 1982-12-07 JP JP21524482A patent/JPS59104917A/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 |
|---|---|
| JPS59104917A (en) | 1984-06-18 |
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