JPH0547628Y2 - - Google Patents
Info
- Publication number
- JPH0547628Y2 JPH0547628Y2 JP1988046682U JP4668288U JPH0547628Y2 JP H0547628 Y2 JPH0547628 Y2 JP H0547628Y2 JP 1988046682 U JP1988046682 U JP 1988046682U JP 4668288 U JP4668288 U JP 4668288U JP H0547628 Y2 JPH0547628 Y2 JP H0547628Y2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- layer
- torpedo
- cylindrical tube
- adapter
- 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 77
- 239000011347 resin Substances 0.000 claims description 77
- 238000007599 discharging Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000012778 molding material Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000003466 welding 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
- 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
- B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—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
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、熱可塑性樹脂等の成形材料を溶融し
て多層管状に押出成形する際に用いる２層樹脂結
合用アダプター金型に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a two-layer resin bonding adapter mold used when melting a molding material such as a thermoplastic resin and extruding it into a multilayer tubular shape.
（従来の技術）
従来、熱可塑性樹脂等の成形材料を溶融して多
層管状に押出成形する際に用いる２層樹脂結合用
アダプター金型として、例えば、第６図に示すよ
うに、アダプター金型本体ａの円形状空洞ｂ内に
内層用樹脂を吐出するトーピード状円筒管ｃが内
装され、上下方向に２本のブリツジｄにより支承
されてなる構造を有したものが知られている（特
公昭41−13628号公報参照）。(Prior Art) Conventionally, as an adapter mold for bonding two-layer resins used when melting a molding material such as a thermoplastic resin and extruding it into a multilayer tubular shape, for example, as shown in FIG. 6, an adapter mold is used. It is known to have a structure in which a torpedo-shaped cylindrical tube c for discharging resin for the inner layer is housed in a circular cavity b of a main body a, and is supported by two bridges d in the vertical direction (Tokuko Sho). 41-13628).
この２層樹脂結合用アダプター金型は、内層用
樹脂ｅと外層用樹脂ｆがそれぞれ吐出される押出
機ｇ，ｈ側にそれぞれ連結されると共に、前方に
管状体成形用ダイＤが取付けられるもので、該結
合用アダプター金型内では、押出機ｇ側から流入
された内層用樹脂ｅはトーピード状円筒管ｃ内を
通じて中心部に中実ロツド状に吐出され内層流ｉ
を形成すると共に、押出機ｈ側から流入された外
層用樹脂ｆはトーピード端部ｋで放射状に分流さ
れてから、更にブリツジｄにより入口端ｍで分流
され、下流の出口端ｎ以降で合流してから、上記
内層流ｉの外周に同心円状に外層流ｊを形成し、
ロツド状の複合流を形成して管状体成形用ダイＤ
側に吐出されるのである。 This two-layer resin bonding adapter mold is connected to the extruder g and h sides from which the inner layer resin e and the outer layer resin f are discharged, respectively, and a die D for forming a tubular body is attached to the front. In the coupling adapter mold, the inner layer resin e that has flowed in from the extruder g side is discharged into the center in the form of a solid rod through the torpedo-shaped cylindrical tube c, forming an inner layer flow i.
At the same time, the outer layer resin f flowing from the extruder h side is divided radially at the torpedo end k, further divided at the inlet end m by the bridge d, and merged after the downstream outlet end n. After that, an outer laminar flow j is formed concentrically around the outer circumference of the inner laminar flow i,
Die D for forming a tubular body by forming a rod-shaped composite flow
It is discharged to the side.
（本考案が解決しようとする課題）
ところで、上記従来技術において、複層構造の
管状体を成形する場合、外層用樹脂ｆがブリツジ
ｄを通過し出口端ｎ以降で合流して環状の外層流
ｊを形成するときに、ブリツジｄでの流動抵抗に
より合流点の流れが遅れることになり、内層流ｉ
の樹脂の一部が遅れ気味の外層流ｊの合流点に引
き込まれた状態で複合流を形成する。その結果、
管状体成形用ダイＤにより成形された管状体は第
７図に示すように外層用樹脂層ｐに凹部ｑ，ｑを
形成するようにして内層用樹脂ｒが入り込み、周
方向の内外層の厚み比率が不均一なものとなり管
状体の物性が低下する。特に、内層用樹脂の流速
が速い場合とか、内層用樹脂の溶融粘度が低い場
合にその傾向は大きい。(Problem to be Solved by the Present Invention) In the above-mentioned prior art, when molding a tubular body with a multilayer structure, the outer layer resin f passes through the bridge d and joins after the outlet end n to form an annular outer layer flow. When forming j, the flow at the confluence is delayed due to flow resistance at bridge d, and the inner layer flow i
A part of the resin is drawn into the confluence of the slightly delayed outer layer flow j, forming a composite flow. the result,
As shown in FIG. 7, in the tubular body formed by the tubular body molding die D, the inner layer resin r enters so as to form recesses q and q in the outer resin layer p, and the thickness of the inner and outer layers in the circumferential direction is The ratio becomes non-uniform and the physical properties of the tubular body deteriorate. This tendency is particularly strong when the flow rate of the inner layer resin is high or when the melt viscosity of the inner layer resin is low.
本考案は、上記の問題点を解消するためになさ
れたもので、その目的とするところは、熱可塑性
樹脂等の成形材料を溶融して多層構造の管状体を
押出成形する際に、それぞれの層の周方向の厚み
が均一となるように成形する２層樹脂結合用アダ
プター金型を低することにある。 The present invention was devised to solve the above-mentioned problems, and its purpose is to extrude a multilayered tubular body by melting a molding material such as a thermoplastic resin. The object of the present invention is to lower the height of a two-layer resin bonding adapter mold for molding so that the circumferential thickness of the layers is uniform.
（問題点を解決するための手段）
本考案２層樹脂結合用アダプター金型は、アダ
プター本体の円形状空洞内に内層用樹脂を吐出す
るトーピード状円筒管がブリツジにより支承させ
れて収容され、トーピード状円筒管の外周壁とア
ダプター本体の円柱状空洞の内周壁との間に形成
される環状間隙が外層用樹脂通路として用いられ
る２層樹脂結合用アダプター金型において、トー
ピード状円筒管前部付近に外層用樹脂通路の絞り
部を有してなり、該絞り部の通路の横断面積がブ
リツジにより支承された部分の外層用樹脂通路の
横断面積より小さくなされていることを特徴とす
るものである。(Means for Solving the Problems) The adapter mold for two-layer resin bonding of the present invention includes a torpedo-shaped cylindrical tube for discharging inner layer resin supported by a bridge and accommodated in a circular cavity of the adapter body. In a two-layer resin bonding adapter mold in which the annular gap formed between the outer circumferential wall of the torpedo-shaped cylindrical tube and the inner circumferential wall of the cylindrical cavity of the adapter body is used as a resin passage for the outer layer, the front part of the torpedo-shaped cylindrical tube is It has a constricted part for the outer layer resin passage nearby, and is characterized in that the cross-sectional area of the passage of the constricted part is smaller than the cross-sectional area of the outer layer resin passage in the part supported by the bridge. be.
（作用）
本考案は上記した構成により、ブリツジを通過
した外層用樹脂がブリツジの出口端以降で合流し
て環状の外層流を形成することになるが、該外層
流は絞り部により絞り込まれるときに樹脂圧、流
速共に大きく作用するので、ブリツジにより発生
するブリツジラインの接合部分に、トーピード状
円筒管から吐出された内層用樹脂の一部が引き込
まれるということがなく外層流は周方向に均一な
厚みを有した流れを形成する。(Function) With the above-described configuration of the present invention, the resin for the outer layer that has passed through the bridge joins together after the outlet end of the bridge to form an annular outer layer flow, but when the outer layer flow is narrowed by the constriction part. Since both the resin pressure and the flow velocity act greatly on the bridge line, a part of the inner layer resin discharged from the torpedo-shaped cylindrical tube is not drawn into the joint of the bridge line generated by the bridge, and the outer layer flow is uniform in the circumferential direction. Forms a thick flow.
（実施例）
次に、本考案筒状体成形用ダイの一実施例を第
１図乃至第３図を参照しながら説明する。(Example) Next, an example of a die for forming a cylindrical body according to the present invention will be described with reference to FIGS. 1 to 3.
１は２層樹脂の結合用アダプター金型で、内層
用樹脂２と外層用樹脂３がそれぞれ吐出される押
出機４，５側にそれぞれ連結されている。 Reference numeral 1 designates an adapter mold for joining two-layer resins, which is connected to extruders 4 and 5 from which inner layer resin 2 and outer layer resin 3 are respectively discharged.
該結合用アダプター金型１は、後部アダプター
本体６に前部アダプター７を取付けアダプター本
体を形成してなり、その内部に押出機５から吐出
される外層用樹脂が流入する円形状空洞８が形成
され、前部アダプター７の前方に管状体成形用ダ
イ９が取付けられるようになつている。 The coupling adapter mold 1 is formed by attaching a front adapter 7 to a rear adapter body 6 to form an adapter body, and a circular cavity 8 into which the outer layer resin discharged from the extruder 5 flows is formed inside. A die 9 for forming a tubular body is attached to the front of the front adapter 7.
１０は内層用樹脂２を吐出するトーピード状円
筒管で、吐出側に向けて拡径された吐出口１２が
設けられており、後部アダプター本体６の円形状
空洞８内に第２図に示すような断面を持つ４本の
ブリツジ１１を介して支承すると共に、該トーピ
ード状円筒管１０の吐出口１２が前部アダプター
本体７の円形状空洞８内に挿入するようにして収
容し、トーピード状円筒管１０の外周壁１３と円
形状空洞８の内周壁８１との間に環状間隙を形成
している。該環状間隙が外層樹脂通路１４として
用いられる。そして、トーピード状円筒管１０の
吐出口１２は、ブリツジ１１に設けられた直角に
屈曲してなる通路１５を介して内層用樹脂２を吐
出する押出機４の注入連結口１６と連通するよう
になつている。 10 is a torpedo-shaped cylindrical tube for discharging the resin 2 for the inner layer, and is provided with a discharge port 12 whose diameter is enlarged toward the discharge side, as shown in FIG. The torpedo-shaped cylindrical tube 10 is supported through four bridges 11 having a similar cross section, and the torpedo-shaped cylindrical tube 10 is housed so that its discharge port 12 is inserted into the circular cavity 8 of the front adapter body 7. An annular gap is formed between the outer peripheral wall 13 of the tube 10 and the inner peripheral wall 81 of the circular cavity 8. The annular gap is used as the outer layer resin passage 14. The discharge port 12 of the torpedo-shaped cylindrical tube 10 communicates with the injection connection port 16 of the extruder 4 that discharges the inner layer resin 2 through a passage 15 bent at right angles provided in the bridge 11. It's summery.
１７は外層用樹脂通路１４の絞り部で、円形状
空洞８が円錐状に狭められ、その内周壁８１がト
ーピード状円筒管１０の外周壁１３に向けて突出
するようにして形成されている。 Reference numeral 17 denotes a constricted portion of the outer layer resin passage 14, in which the circular cavity 8 is narrowed into a conical shape, and the inner circumferential wall 81 thereof is formed so as to protrude toward the outer circumferential wall 13 of the torpedo-shaped cylindrical tube 10.
そして、該絞り部１７の絞り度合は、第３図に
点状で示す絞り部１７の外層用樹脂通路１４ｘの
横断面積Ｘが、第２図に示すように、ブリツジ１
１により支承された部分であつて、内周壁８１と
外周壁１３とで囲まれブリツジ１１により支承さ
れ４分割された点状で示す部分の外層用樹脂通路
１４ｙの横断面積Ｙより小さくなされている。 The degree of constriction of the constricted portion 17 is such that the cross-sectional area
1, which is surrounded by the inner circumferential wall 81 and the outer circumferential wall 13, is supported by the bridge 11, and is smaller than the cross-sectional area Y of the outer layer resin passage 14y, which is shown as a dotted portion divided into four parts. .
その面積比率Ｙ／Ｘは2.0〜3.0の範囲であると
ブリツジ１１により形成されるブリツジラインの
融着強度が向上し好ましいが、上記比率Ｙ／Ｘが
2.0未満では融着強度が不足し、しかも外層樹脂
層と内層樹脂層とにブリツジラインに起因する偏
肉を生じ、また、3.0を越えると樹脂の流動抵抗
が大きくなり背圧が増加する共に樹脂の流れが悪
く、例えば、ポリ塩化ビニル樹脂を外層用樹脂と
して用いた場合、樹脂の熱分解を発生し好ましく
ない。 It is preferable that the area ratio Y/X is in the range of 2.0 to 3.0 because the welding strength of the bridge line formed by the bridge 11 is improved.
If it is less than 2.0, the fusion strength will be insufficient, and uneven thickness will occur between the outer resin layer and the inner resin layer due to the bridge line.If it exceeds 3.0, the flow resistance of the resin will increase, the back pressure will increase, and the resin will deteriorate. If a polyvinyl chloride resin is used as the resin for the outer layer, thermal decomposition of the resin occurs, which is not preferable.
また、円形状空洞８の円錐状に絞り込む角度α
は30°〜45°の範囲で設定するのが好ましく、絞込
角度αが45°を越えると樹脂の流動抵抗が大きく
なり背圧が増加すると共に流れが悪くなり、絞込
角度αが30°未満では絞り込みの傾斜部分が長く
なり金型が大きくなり好ましくない。 Also, the angle α at which the circular cavity 8 is narrowed into a conical shape is
is preferably set in the range of 30° to 45°; if the squeezing angle α exceeds 45°, the flow resistance of the resin will increase, the back pressure will increase, and the flow will worsen, so if the squeezing angle α exceeds 30° If it is less than this, the slanted part of the drawing becomes long and the mold becomes large, which is not preferable.
尚、第１図乃至第３図に示す例では、絞り部１
７は円形状空洞８が円錐状に狭めら、その内周壁
８１がトーピード状円筒管１０の外周壁１３に向
けて突出するようにして形成されているが、特に
これに限定するものではなく、第４図に示すよう
に円形状空洞８を円錐状に狭めてから平行の巾狭
の円形状空洞８２を形成し、該円形状空洞８２内
にトーピード状円筒管１０の先端部１８が位置す
るようにしてもよい。 In the example shown in Figs. 1 to 3, the narrowing portion 1
In the example shown in FIG. 7, the circular cavity 8 is narrowed in a conical shape, and its inner wall 81 protrudes toward the outer wall 13 of the torpedo-shaped cylindrical tube 10. However, this is not particularly limited to this, and it is also possible to narrow the circular cavity 8 in a conical shape as shown in FIG. 4, and then form a parallel narrow circular cavity 82, within which the tip 18 of the torpedo-shaped cylindrical tube 10 is positioned.
また、第５図に示すように円形状空洞８内にト
ーピード状円筒管１０の前部を先太に膨脹させて
拡径した吐出口１２を設けてもよい。このように
トーピード状円筒管１０の前部が先太に膨脹され
ていると吐出口１２の口径を大きくすることがで
き、内層用樹脂２を低速で吐出することが可能と
なる。 Further, as shown in FIG. 5, a discharge port 12 may be provided in the circular cavity 8 by expanding the front part of the torpedo-shaped cylindrical tube 10 to a larger diameter. If the front part of the torpedo-shaped cylindrical tube 10 is expanded in a thicker manner in this way, the diameter of the discharge port 12 can be increased, and the inner layer resin 2 can be discharged at a low speed.
次に、上記のように構成した本考案２層樹脂結
合用アダプター金型を用いて多層構造の管状体を
成形する方法について説明する。 Next, a method of molding a multilayered tubular body using the two-layer resin bonding adapter mold of the present invention constructed as described above will be described.
内層用樹脂２として低粘度溶融の樹脂を、外層
用樹脂３として高粘度溶融の樹脂を用い、それぞ
れ押出機４，５により２層樹脂の結合用アダプタ
ー金型１内に吐出する。該結合用アダプター金型
１内では、内層用樹脂２が通路１５を通じて流
れ、トーピード状円筒管１０の吐出口１２より吐
出されて円形状空洞部８の中心部に中実ロツド状
の内層流１９を形成すると共に、一方、押出機５
により吐出された外層用樹脂３が、円形状空洞８
内に流入され、トーピード状円筒管１０の円錐状
端部２０によつて放射状に外層用樹脂通路１４ｙ
へと末広がりに送られ、ブリツジ１１の入口端２
１で分流されてから出口端２２で合流して環状の
外層流２３を形成することになる。該環状の外層
流２３は絞り部１７で一旦絞られてから、前記ロ
ツド状の内層流１９の外周に同心円の環状の外層
流２３を形成し、２層の流れの界面間が結合され
た中実ロツド状の複合流として筒状体成形用ダイ
９側に吐出されるのである。 A low viscosity molten resin is used as the inner layer resin 2, and a high viscosity molten resin is used as the outer layer resin 3, and these are discharged into the adapter mold 1 for bonding the two-layer resin by extruders 4 and 5, respectively. Inside the coupling adapter mold 1, the inner layer resin 2 flows through the passage 15, is discharged from the outlet 12 of the torpedo-shaped cylindrical tube 10, and forms a solid rod-shaped inner layer flow 19 in the center of the circular cavity 8. On the other hand, the extruder 5
The outer layer resin 3 discharged from the circular cavity 8
The conical end 20 of the torpedo-shaped cylindrical tube 10 radially connects the outer layer resin passage 14y.
The inlet end 2 of the bridge 11
The flows are divided at 1 and then merged at the outlet end 22 to form an annular outer layer flow 23. The annular outer laminar flow 23 is once constricted by the constriction part 17, and then a concentric annular outer laminar flow 23 is formed around the outer circumference of the rod-shaped inner laminar flow 19, and a middle layer is formed in which the interface between the two layers of flow is connected. It is discharged to the cylindrical body forming die 9 side as a composite flow in the form of a solid rod.
絞り部１７を通過する外層流２３は樹脂圧、流
速共に大きくなるので、トーピード状円筒管１０
の吐出口１２から吐出され低粘度の溶融樹脂の内
層流１９と合流するときに、ブリツジ１１により
形成されるブリツジラインに内層流１９を引き込
むということがない。 Since the outer layer flow 23 passing through the constriction part 17 has a large resin pressure and flow velocity, the torpedo-shaped cylindrical pipe 10
When the molten resin is discharged from the discharge port 12 and merges with the inner layer flow 19 of low-viscosity molten resin, the inner layer flow 19 is not drawn into the bridge line formed by the bridge 11.
このように、内層流１９と外層流２３とからな
る中実ロツド状の複合流は、管状体成形用ダイ９
の円錐状ヘツド９１の先端９２によつて、中心部
に低粘度溶融の樹脂である内層流１９層が放射状
に裂かれて末広に送られると共に、高粘度溶融の
樹脂の外層流２３は外型９３の内周面に沿つて流
れ、ダイ出口９４から吐出されることにより、そ
れぞれの層の肉厚が均一な２層構造の管状体が成
形されることになる。 In this way, the solid rod-shaped composite flow consisting of the inner laminar flow 19 and the outer laminar flow 23 flows through the tubular body forming die 9.
By the tip 92 of the conical head 91, the inner laminar flow 19 layer of low-viscosity molten resin in the center is split radially and sent to the outer mold, and the outer laminar flow 23 of high-viscosity molten resin is sent to the outer mold. By flowing along the inner peripheral surface of the die 93 and being discharged from the die outlet 94, a tubular body having a two-layer structure in which each layer has a uniform thickness is formed.
尚、本考案２層樹脂結合用アダプター金型を外
層用樹脂を吐出する押出機と管状体成形用ダイと
の間で複数個直列に接続すれば３層以上の多層樹
脂結合用アダプターとしても利用することができ
る。 In addition, if a plurality of adapter molds for bonding two-layer resin of the present invention are connected in series between an extruder that discharges resin for the outer layer and a die for forming a tubular body, it can also be used as an adapter for bonding multilayer resin of three or more layers. can do.
（考案の効果）
本考案２層樹脂結合用アダプター金型は、上記
の構成のとおりであるが、特に、トーピード状円
筒管前部付近に外層用樹脂通路の絞り部を有して
なり、該絞り部の通路の横断面積がブリツジによ
り支承された部分の外層用樹脂通路の横断面積よ
り小さくなされているので、外層用樹脂がブリツ
ジを通過してブリツジの出口端以降で合流して発
生するブリツジラインの部分に、トーピード状円
筒管から吐出された内層用樹脂の一部が引き込ま
れるということがなく、多層構造の管状体の押出
成形に用いると、それぞれの層の周方向の厚みが
均一な多層構造の管状体を得ることができる。(Effects of the invention) The two-layer resin bonding adapter mold of the present invention has the above-mentioned configuration, but in particular has a constricted part for the resin passage for the outer layer near the front part of the torpedo-shaped cylindrical tube, and Since the cross-sectional area of the passage in the throttle part is smaller than the cross-sectional area of the outer layer resin passage in the part supported by the bridge, a bridge line is generated when the outer layer resin passes through the bridge and merges after the exit end of the bridge. Part of the resin for the inner layer discharged from the torpedo-shaped cylindrical tube is not drawn into the part, and when used for extrusion molding of a tubular body with a multilayer structure, it is possible to create a multilayer structure with uniform thickness in the circumferential direction of each layer. A tubular body of structure can be obtained.
第１図は本考案２層樹脂結合用アダプター金型
の一実施例を示す断面図、第２図は第１図中の
−線により切断し矢印方向にみた断面図、第３
図は第１図中の−線により切断し矢印方向に
みた断面図、第４図及び第５図は本考案２層樹脂
結合用アダプター金型の他の実施例をそれぞれ示
す断面図、第６図は従来例を示す断面図、第７図
は従来例の２層樹脂結合用アダプター金型を用い
て成形した多層構造の管状体を示す図である。
符号の説明、１……結合用アダプター金型、２
……内層用樹脂、３……外層用樹脂、４，５……
押出機、６……後部アダプター本体、７……前部
アダプター本体、８……円形状空洞、８１……内
周壁、９……管状体成形用ダイ、１０……トーピ
ード状円筒管、１１……ブリツジ、１２……吐出
口、１３……外周壁、１４……外層用樹脂通路、
１５……内層用樹脂通路、１７……絞り部、１９
……内層流、２３……外層流。
Fig. 1 is a sectional view showing an embodiment of the adapter mold for two-layer resin bonding of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1 and viewed in the direction of the arrow, and Fig. 3
The figure is a cross-sectional view taken along the - line in Figure 1 and viewed in the direction of the arrow; Figures 4 and 5 are cross-sectional views showing other embodiments of the adapter mold for two-layer resin bonding of the present invention; The figure is a sectional view showing a conventional example, and FIG. 7 is a diagram showing a multilayer structure tubular body molded using a conventional two-layer resin bonding adapter mold. Explanation of symbols, 1... Connecting adapter mold, 2
...Resin for inner layer, 3...Resin for outer layer, 4,5...
Extruder, 6... Rear adapter body, 7... Front adapter body, 8... Circular cavity, 81... Inner peripheral wall, 9... Die for forming tubular body, 10... Torpedo-shaped cylindrical tube, 11... ... bridge, 12 ... discharge port, 13 ... outer peripheral wall, 14 ... resin passage for outer layer,
15... Resin passage for inner layer, 17... Squeezed part, 19
...Inner layer flow, 23...Outer layer flow.
Claims (1)
吐出するトーピード状円筒管がブリツジにより支
承されて収容され、トーピード状円筒管の外周壁
とアダプター本体の円柱状空洞の内周壁との間に
形成される環状間隙が外層用樹脂通路として用い
られる２層樹脂結合用アダプター金型において、
トーピード状円筒管前部付近に外層用樹脂通路の
絞り部を有してなり、該絞り部の通路の横断面積
がブリツジにより支承された部分の外層用樹脂通
路の横断面積より小さくなされていることを特徴
とする２層樹脂結合用アダプター金型。 A torpedo-shaped cylindrical tube for discharging the resin for the inner layer is supported and housed in the circular cavity of the adapter body by a bridge, and the torpedo-shaped cylindrical tube is formed between the outer circumferential wall of the torpedo-shaped cylindrical tube and the inner circumferential wall of the cylindrical cavity of the adapter body. In an adapter mold for two-layer resin bonding, in which an annular gap is used as a resin passage for the outer layer,
A constricted portion of the resin passage for the outer layer is provided near the front portion of the torpedo-shaped cylindrical tube, and the cross-sectional area of the passage of the constricted portion is made smaller than the cross-sectional area of the resin passage for the outer layer in the portion supported by the bridge. An adapter mold for two-layer resin bonding characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988046682U JPH0547628Y2 (en) | 1988-04-05 | 1988-04-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988046682U JPH0547628Y2 (en) | 1988-04-05 | 1988-04-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01153920U JPH01153920U (en) | 1989-10-24 |
| JPH0547628Y2 true JPH0547628Y2 (en) | 1993-12-15 |
Family
ID=31272943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988046682U Expired - Lifetime JPH0547628Y2 (en) | 1988-04-05 | 1988-04-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0547628Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101546997B1 (en) * | 2008-09-29 | 2015-08-24 | 스트랜덱스 코포레이션 | Dies for making extruded synthetic wood and methods relating thereto |
| US8562885B2 (en) * | 2009-02-21 | 2013-10-22 | Dow Global Technologies Inc. | Multilayer structures having annular profiles and methods and apparatus of making the same |
-
1988
- 1988-04-05 JP JP1988046682U patent/JPH0547628Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01153920U (en) | 1989-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5882694A (en) | Extrusion system with balanced flow passage | |
| CA1061971A (en) | Extruder head for producing composite plastic tubes with staggered welds | |
| CA1166415A (en) | Composite die assembly for use in the production of thermoplastic tubing | |
| GB1587227A (en) | Thermoplastics multiwalled pipes | |
| GB1375409A (en) | ||
| AU597560B2 (en) | Triple-wall foam coextrusion apparatus | |
| JP2004504179A (en) | Tubular multilayer film, method and apparatus for producing the same | |
| AU606229B2 (en) | Method of producing an internally-smooth, externally ribbed tube from extrudable plastic and apparatus for carrying out the method | |
| GB1511777A (en) | Extruder head | |
| US4509907A (en) | Extrusion head for tubular bodies and hollow profiles | |
| BRPI0508338B1 (en) | Multilayer Dose, Multilayer Object and Process for Producing a Multilayer Dose | |
| CN206357607U (en) | Double-layer composite pipe extruded mould | |
| JPH0547628Y2 (en) | ||
| CN106424186B (en) | A kind of shunting combination hot extruding die | |
| JPS6248521A (en) | Extrusion head with deflecting sleeve | |
| CN106738757A (en) | Double-layer composite pipe extruded mould improved structure | |
| US5843490A (en) | Die having protrusions for molding machine | |
| CN2336949Y (en) | Plastic three-layer co-extruding machines heads for tubes | |
| US4942010A (en) | Method of injection molding of tubular parts to eliminate weld lines | |
| EP0486735A1 (en) | Die head for plastic with barrier forming material | |
| US4574067A (en) | Crosshead with static mixers | |
| JP3100874B2 (en) | Hollow molding machine crosshead | |
| CN210552907U (en) | Extrusion die head | |
| CN206678366U (en) | A kind of three-layer composite pipe extruder die head | |
| CN213412830U (en) | Die structure for pipe extrusion |