JPH09239817A - Tubular multilayered blow molded product and production thereof - Google Patents
Tubular multilayered blow molded product and production thereofInfo
- Publication number
- JPH09239817A JPH09239817A JP8046388A JP4638896A JPH09239817A JP H09239817 A JPH09239817 A JP H09239817A JP 8046388 A JP8046388 A JP 8046388A JP 4638896 A JP4638896 A JP 4638896A JP H09239817 A JPH09239817 A JP H09239817A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- resin
- molded product
- parison
- surface side
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229920005989 resin Polymers 0.000 claims abstract description 79
- 239000011347 resin Substances 0.000 claims abstract description 79
- 238000000071 blow moulding Methods 0.000 claims description 39
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 2
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 229920006122 polyamide resin Polymers 0.000 abstract description 3
- 229920000571 Nylon 11 Polymers 0.000 abstract description 2
- 239000003365 glass fiber Substances 0.000 abstract description 2
- 229920002647 polyamide Polymers 0.000 abstract description 2
- 229920002292 Nylon 6 Polymers 0.000 abstract 1
- 239000004952 Polyamide Substances 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 abstract 1
- 210000003128 head Anatomy 0.000 description 24
- 238000000034 method Methods 0.000 description 16
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000005192 partition Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 210000000887 face Anatomy 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000011144 upstream manufacturing 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
- B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
-
- 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
- B29C49/04102—Extrusion blow-moulding extruding the material continuously
-
- 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
- B29C2949/3006—Preforms or parisons made of several components having tangentially different components within one layer, e.g. longitudinal stripes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は管状多層ブロー成形
品及びその製造方法に関し、特に複数の熱可塑性樹脂を
原料として、俗に３次元ブロー成形法と呼ばれる側バリ
無しブロー成形法で製造され、主に自動車アンダーフー
ド（エンジンルーム内）等の可撓性を有する吸気系ダク
トやパイプ等に用いられる多層ブロー成形品及びその製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular multi-layer blow molded article and a method for producing the same, and in particular, it is produced from a plurality of thermoplastic resins by a side burr-free blow molding method commonly called a three-dimensional blow molding method. The present invention relates to a multilayer blow-molded product mainly used for flexible intake ducts and pipes such as automobile underhood (in an engine room) and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】長手方向の寸法がそれに直交する横断面
内の寸法に比べてかなり大きく、かつ全体形状が三次元
的に屈曲している吸気系ダクトないしパイプ等の管状ブ
ロー成形品を側面の長手方向に沿うバリを出さないで成
形する方法（いわゆる三次元ブロー成形法）やその装置
が特公昭５４−１５５８０号公報や米国特許（ＵＳＰ47
38612）に開示されている。これらはともに、金型を垂
直にではなく水平に設置するか、又は垂直に対して傾斜
させて設置し、パリソン射出工程でダイヘッドから射出
されるパリソンを下側に設置する金型半体で受け止め
て、そのキャビテイ内にすっぽり収納してしまう方式を
とっている。その際、射出されるパリソンの径をキャビ
テイの径より小さくし、かつ下側金型半体のキャビテイ
の形状（管状成形品の形状に応じて三次元的に屈曲して
いる）に沿ってダイヘッドと下側金型半体の相対位置を
変化させながらパリソン収納を行うのが特徴である。2. Description of the Related Art A tubular blow-molded product such as an intake duct or pipe having a longitudinal dimension considerably larger than a dimension in a cross section orthogonal thereto and having an overall shape bent three-dimensionally is A method for forming without forming a burr along the longitudinal direction (so-called three-dimensional blow molding method) and its apparatus are disclosed in Japanese Patent Publication No. 54-15580 and US Pat.
38612). In both cases, the mold is installed horizontally instead of vertically, or installed at an angle with respect to the vertical, and the parison ejected from the die head in the parison injection process is installed on the lower side and received by the mold half. Then, it is stored in the cavity. At that time, the diameter of the injected parison is made smaller than the diameter of the cavity, and the die head follows the shape of the cavity of the lower mold half (three-dimensionally bent according to the shape of the tubular molded product). The feature is that the parison is stored while changing the relative position of the lower mold half.
【０００３】また、これら三次元ブロー成形法を必須要
件として用い、加えてパリソンの最外層と最内層の層厚
比を成形品長手方向に沿って変化させる多層ブロー成形
法及びこの方法による多層ブロー成形品が雑誌「合成樹
脂」（日本合成樹脂技術協会：Vol.34,No.5,p25~35)や
雑誌「プラスチックス」（工業調査会；Vol.38,No.12,p
118~124)に記載されている。前者は一般にコネクション
ブロー成形法と呼ばれ、後者にはエクスチェンジブロー
成形法という名称が付けられている。Further, these three-dimensional blow molding methods are used as essential requirements, and in addition, the multilayer blow molding method in which the layer thickness ratio between the outermost layer and the innermost layer of the parison is changed along the longitudinal direction of the molded article and the multilayer blow molding method. Molded articles are magazines "Synthetic Resins" (Japan Synthetic Resin Technology Association: Vol.34, No.5, p25 ~ 35) and magazines "Plastics" (Industrial Research Committee; Vol.38, No.12, p.
118-124). The former is generally called a connection blow molding method, and the latter is named an exchange blow molding method.
【０００４】これらコネクションブロー成形法やエクス
チェンジブロー成形法で最外層に硬質樹脂を用い、最内
層に軟質樹脂を用いてダクトないしパイプ等の管状成形
品を製造する際、成形品の特定箇所にだけ内層側軟質樹
脂の層厚を外層側硬質樹脂の層厚より大幅に上回るよう
にし、その他全ての箇所では逆に外層側硬質樹脂の層厚
が内層側軟質樹脂の層厚を大幅に上回るようにしておけ
ば、全体としては必要な硬さや強度を保つとともに、上
記特定箇所で可撓性を有するダクトないしパイプ等の管
状成形品を製造することができる。In the connection blow molding method or exchange blow molding method, when a hard resin is used for the outermost layer and a soft resin is used for the innermost layer to manufacture a tubular molded article such as a duct or a pipe, only a specific portion of the molded article is manufactured. The layer thickness of the soft resin on the inner layer side should be significantly larger than that of the hard resin on the outer layer side, and conversely, at all other locations, the layer thickness of the outer layer hard resin should be significantly larger than the layer thickness of the inner layer soft resin. If so, it is possible to manufacture a tubular molded article such as a duct or pipe having flexibility and flexibility at the specific location while maintaining necessary hardness and strength as a whole.
【０００５】現在こうした管状成形品は主に自動車アン
ダーフード（エンジンルーム内）の吸気系ダクト類等と
して数多く使用されているものである。これらコネクシ
ョンブロー成形法やエクスチェンジブロー成形法の特徴
は、ダクトないしパイプ状成形品の最外層と最内層の層
厚比を長手方向に沿って求められるパターンに応じて変
化させられる点にあるが、成形品の長手方向に直交する
横断面内の円周方向に沿って最外層と最内層の層厚比を
変化させること或いは層厚比の変化する境界線の位置を
変化させることは不可能である。At present, such tubular molded articles are mainly used as many intake ducts for automobile underhoods (in the engine room). A characteristic of these connection blow molding methods and exchange blow molding methods is that the layer thickness ratio of the outermost layer and the innermost layer of the duct or pipe-shaped molded article can be changed according to the pattern required along the longitudinal direction. It is impossible to change the layer thickness ratio between the outermost layer and the innermost layer along the circumferential direction in the cross section orthogonal to the longitudinal direction of the molded product, or to change the position of the boundary line where the layer thickness ratio changes. is there.
【０００６】特開平６−２９７５４９号公報には、コネ
クションブロー成形法に関する複合材質を備えたパリソ
ン射出のための制御装置が開示されている。一方特開平
６−１５５５６０公報には、パリソンを円周方向に沿っ
て左右二つの区画に区分し、各区画における樹脂種、層
数及び層厚比のいずれか１以上を変化させる多層ブロー
成形法が開示されている。Japanese Unexamined Patent Publication (Kokai) No. 6-297549 discloses a controller for parison injection provided with a composite material relating to the connection blow molding method. On the other hand, in Japanese Unexamined Patent Publication No. 6-155560, a parison is divided into two sections on the left and right along the circumferential direction, and any one or more of the resin species, the number of layers, and the layer thickness ratio in each section is changed. Is disclosed.
【０００７】さらに、特開平６−１５５５６１号公報に
は、上記２区画に区分されたパリソンの左右各区画での
最外層と最内層の層厚比（ｒ1，ｒ2)を、それらの和が
一定（ｒ1＋ｒ2＝１）という条件のもとでパリソン長手
方向に沿って変化させる多層ブロー成形法が開示されて
いる。ただし、この特開平６−１５５５６１号公報の方
法にコネクションブロー成形法やエクスチェンジブロー
成形法で実施されている方式のパリソン長手方向に沿う
最外層・最内層の層厚比変化を行う方法が含まれていな
いことは言うまでもない。Further, in Japanese Unexamined Patent Publication (Kokai) No. 6-155561, the layer thickness ratio (r 1 , r 2 ) of the outermost layer and the innermost layer in each of the left and right sections of the parison divided into the above two sections is calculated by summing them. A multi-layer blow molding method is disclosed in which the parison is varied along the lengthwise direction of the parison under the condition that is constant (r 1 + r 2 = 1). However, the method disclosed in Japanese Unexamined Patent Publication No. 6-155561 includes a method of changing the layer thickness ratio between the outermost layer and the innermost layer along the parison longitudinal direction, which is a method implemented by the connection blow molding method or the exchange blow molding method. Not to mention not.
【０００８】また、特開平６−１５５５４５号公報に
は、パリソンを円周方向に沿って複数区画に区分し各区
画における樹脂種、層数及び層厚比のいずれか１以上を
変化させるとともに、ダイヘッド内に装着されたフラッ
ピングネイルと呼ばれる装置を揺動させながらパリソン
を射出することによって各区画自体の円周方向の幅をパ
リソン長手方向に沿って変化させる多層ブロー成形法が
開示されている。Further, in Japanese Patent Laid-Open No. 6-155545, the parison is divided into a plurality of sections along the circumferential direction and any one or more of the resin species, the number of layers and the layer thickness ratio in each section are changed, and A multi-layer blow molding method is disclosed in which the circumferential width of each section itself is changed along the parison longitudinal direction by injecting the parison while rocking a device called a flapping nail mounted in a die head. .
【０００９】ところで自動車のエンジンルーム内に使用
されるダクト類は、同じ自動車部品の中でも例えばバン
パーやスポイラー等のように常に人目に触れるものでは
ないが、それでもボンネットを開けた時には必ずその上
半面が人目に入るものである。従って少なくとも最外層
の上半面部分は美観に優れた樹脂であることが望まし
く、一方最外層の下半面部分は車体に取り付けるための
ステーやブラケット等を装着しなければならないので、
文字通り剛性の高い硬質樹脂でなければならない。加え
て最内層は軟質樹脂であって、この軟質樹脂の寄与によ
る可撓性を有する部分を少なくとも１箇所は持っていな
ければならないが、このような構成の最外層及び最内層
を有する成形品を作ることは従来のコネクションブロー
成形法やエクスチェンジブロー成形法では不可能であっ
た。By the way, the ducts used in the engine room of an automobile are not always visible to the eyes such as bumpers and spoilers among the same automobile parts, but even when the bonnet is opened, the upper half of the duct is always exposed. It is in the public eye. Therefore, it is desirable that at least the upper half of the outermost layer is a resin with excellent appearance, while the lower half of the outermost layer must be equipped with stays or brackets for attaching to the vehicle body.
It must be a hard resin that is literally rigid. In addition, the innermost layer is a soft resin, and it is necessary to have at least one portion having flexibility due to the contribution of this soft resin. However, a molded article having an outermost layer and an innermost layer having such a constitution is required. It was impossible to make by the conventional connection blow molding method and exchange blow molding method.
【００１０】さらに、ただ単に成形品の最外層を２区画
に区分するだけなら特開平６−１５５５６０公報に開示
されている方法でも可能であるが、三次元的に屈曲した
成形品の最外層を全ての長手方向において２区画に区分
し、かつ該成形品が車体に取り付けられた時どちらか一
方の区画だけが必ず（人目に触れる）上半面側又は前面
側にくるように区画構成することは、上記特開平６−１
５５５６０公報の方法とコネクションブロー成形法やエ
クスチェンジブロー成形法とを単純に組み合わせただけ
では、容易に解決できるものではない。Further, if the outermost layer of the molded product is simply divided into two sections, the method disclosed in JP-A-6-155560 is also possible, but the outermost layer of the molded product bent three-dimensionally can be used. It is possible to divide into two sections in all longitudinal directions, and to configure so that when the molded product is attached to the vehicle body, only one of the sections is always on the upper half surface side or the front surface side (visible to the human eye). The above-mentioned JP-A-6-1
A simple combination of the method of 55560 and the connection blow molding method or the exchange blow molding method cannot be easily solved.
【００１１】この点を添付図によって詳細に説明する。
図３，図４に金型が水平に設置されているエクスチェン
ジブロー成形法と特開平６−１５５５６０公報の方法を
組み合わせたパリソン射出工程が模式的に示されている
（金型が傾斜して設置されるコネクションブロー成形法
の場合も以下に示す状況はほとんど同じである）。図３
は、屈曲し立体的な形状に適合する金型キャビテイ溝２
を平面状又は曲面状の重ね合わせ面に刻設した上金型及
び下金型からなるブロー成形用金型のうち開放状態の下
金型１の溝内に上記ダイヘッド先端ノズル３を溝２の中
心軸線上に沿って矢印（Ｙ軸）方向へ相対移動させなが
ら最外層が境界線４でＡ樹脂とＢ樹脂からなる２区画に
区分されたパリソン５を連続注出している状況を示し、
図４は同じく矢印（Ｘ軸のマイナス）方向に相対移動し
ている状況を示している。This point will be described in detail with reference to the accompanying drawings.
3 and 4 schematically show a parison injection step in which the exchange blow molding method in which the mold is horizontally installed and the method in Japanese Patent Laid-Open No. 6-155560 are combined (the mold is installed at an inclination). In the case of the connection blow molding method, the following situations are almost the same). FIG.
Is a mold cavity groove 2 that bends and conforms to a three-dimensional shape
Of the die head tip nozzle 3 in the groove of the lower mold 1 in an open state of the blow mold composed of an upper mold and a lower mold, which are engraved on a flat or curved overlapping surface. While the relative movement in the direction of the arrow (Y-axis) along the central axis, the outermost layer is continuously pouring out the parison 5 divided into two sections consisting of A resin and B resin at the boundary line 4,
FIG. 4 also shows a situation in which relative movement is made in the direction of the arrow (minus the X axis).
【００１２】図示していないが、上記多層パリソン５を
該キャビテイ溝２内に連続注出した後で、上金型を下金
型１に重ね合わせて多層パリソン４をキャビテイ溝２内
に包蔵し、先端と後端を上下金型の重ね合わせ面で閉塞
した状態で多層パリソン内に圧縮空気を注入するブロー
成形法がなされる。図５に、この成形方法で製造した場
合のダクト状成形品６の模式図及び（ア）（イ）（ウ）
の断面図を示す。Although not shown, after continuously pouring the multi-layer parison 5 into the cavity groove 2, the upper die is superposed on the lower die 1 to enclose the multi-layer parison 4 in the cavity groove 2. Blow molding is performed by injecting compressed air into the multilayer parison with the front end and the rear end closed by the overlapping surfaces of the upper and lower molds. FIG. 5 is a schematic view of the duct-shaped molded product 6 produced by this molding method and (a) (a) (c)
FIG.
【００１３】これらの図から明らかなように、最外層が
２区画に区分されたパリソンが単純に射出されるだけで
は、どちらか一方の区画（例えば図３のＡ樹脂の区画）
が常に成形品の上半面側にくるとは限らない。例えば図
５に示された成形品６の（ａ）部分及び（ｃ）部分では
Ａ樹脂が成形品の上半面にきているが、（ａ）部分の進
行方向から左側へ略９０度だけ屈曲した成形品の（ｂ）
部分ではそうではなく、成形品の左半面にきてしまって
いる（図５中の（ア），（イ），（ウ）断面図参照）。
下側金型半体１のキャビテイ溝２の形状に対するパリソ
ン最外層２区画の境界線４の位置が図３及び図４に示す
ような状況の場合には、Ａ樹脂の区画が正しく成形品の
上半面にくるのはダイヘッドの移動方向がＹ軸方向（な
いしＹ−Ｚ面内）だけの時に限られる。As is apparent from these figures, if the parison in which the outermost layer is divided into two compartments is simply injected, either one of the compartments (for example, the A resin compartment in FIG. 3) is injected.
Does not always come to the upper half side of the molded product. For example, in the parts (a) and (c) of the molded product 6 shown in FIG. 5, the A resin is on the upper half surface of the molded product, but is bent to the left from the traveling direction of the part (a) by approximately 90 degrees. (B) of the molded product
This is not the case in the part, but it has come to the left half surface of the molded product (see (a), (a), and (c) cross-sectional views in FIG. 5).
When the position of the boundary line 4 of the parison outermost layer 2 section with respect to the shape of the cavity groove 2 of the lower mold half 1 is in the situation as shown in FIG. 3 and FIG. It comes to the upper half surface only when the moving direction of the die head is only in the Y-axis direction (or in the YZ plane).
【００１４】[0014]
【発明が解決しようとする課題】すなわち三次元的に屈
曲した成形品を三次元ブロー成形法を用いて製造する場
合、成形品の最外層の区画を仕切る境界線の位置はパリ
ソン射出開始時点で金型キャビテイのパーテイングライ
ンにほぼ合致するように設置されていても、その後のダ
イヘッドの下側金型半体に対する相対移動の進行方向が
左右に所定角度変位した場合、金型パーテイングライン
の最初の進行方向の位置からずれてしまうという問題点
があり、これを取り付けた場合の屈曲した管状成形品は
外観に劣ることからこれの改善が求められていた。従っ
て本発明の課題は、取り付けた時の外観に優れ且つ取り
付け部位での破損や摩耗を防止した三次元的に屈曲した
管状成形品及びその製造方法を提供することである。ま
た本発明は、三次元的に屈曲した成形品が車体等に取り
付けられた時、外観に優れた一方の区画だけが必ず（人
目に触れる）上半面側又は前面側にくるように区画構成
した管状成形品及びその製造方法を提供することであ
る。That is, when a three-dimensionally bent molded product is manufactured by using the three-dimensional blow molding method, the position of the boundary line that partitions the outermost layer of the molded product is located at the start of parison injection. Even if it is installed so as to almost match the parting line of the mold cavity, if the moving direction of the relative movement with respect to the lower mold half of the die head afterwards is displaced by a predetermined angle to the left and right, the mold parting line There is a problem that it is displaced from the initial position in the traveling direction, and the bent tubular molded product with this attached is inferior in external appearance, and therefore improvement thereof has been demanded. Therefore, an object of the present invention is to provide a three-dimensionally bent tubular molded product which has an excellent appearance when mounted and which prevents damage or wear at the mounting site, and a method for manufacturing the same. Further, according to the present invention, when a three-dimensionally bent molded product is attached to a vehicle body or the like, only one of the compartments having an excellent appearance is configured so as to be always on the upper half surface side or the front surface side (touched by human eyes). A tubular molded article and a method for producing the same.
【００１５】[0015]
【課題を解決するための手段】本願発明者は、かかる課
題を解決するため、種々検討の結果パリソンの区画境界
線をフラッピングネイルの揺動制御によって自由に制御
する技術を組み合わせた本発明を完成した。即ち本願発
明の管状多層ブロー成形品は、全体形状が三次元的に屈
曲し管壁肉厚が実質的に均一である管状多層ブロー成形
品であって、管壁内外各層の肉厚比が長手方向に沿って
変化した部分を有し、少なくとも最外層は外表面の要求
される方向だけに向いた半面とその反対側の半面の二つ
の区画領域から形成されており、かつ内層を形成する樹
脂種は、最外層を形成している二つの区画領域の樹脂種
のうちの少なくとも一方と異なることを特徴としてい
る。In order to solve such a problem, the inventors of the present invention have conducted various investigations to realize the present invention in which a technique for freely controlling the parison boundary line by the swing control of the flapping nail is combined. completed. That is, the tubular multilayer blow-molded product of the present invention is a tubular multilayer blow-molded product in which the overall shape is three-dimensionally bent and the wall thickness of the pipe wall is substantially uniform, and the wall thickness ratio of each layer inside and outside the pipe wall is long. A resin that has a portion that changes along the direction, and at least the outermost layer is formed from two partition regions, one half surface facing only the required direction of the outer surface and the other half surface, and forming the inner layer. The seed is characterized by being different from at least one of the resin seeds of the two partitioned regions forming the outermost layer.
【００１６】前記最外層は全ての長手方向に平行にそれ
ぞれ樹脂種が異なる上面側（又は前面側）と下面側（又
は背面側）の二つの区画領域から形成されていることが
好ましい。また、前記管壁内外各層の肉厚比が長手方向
に沿って変化した部分で内層側に配置した軟質性樹脂層
の肉厚比を高くして可撓性（変形性）を備えていること
が好ましい。It is preferable that the outermost layer is formed in parallel with all the longitudinal directions from two partitioned regions of an upper surface side (or front surface side) and a lower surface side (or back surface side) of different resin species. Further, the flexible resin layer disposed on the inner layer side is made to have high flexibility (deformability) by increasing the thickness ratio of the flexible resin layer arranged on the inner layer side in the portion where the thickness ratio of the inner and outer layers of the pipe wall changes along the longitudinal direction. Is preferred.
【００１７】また本願発明の管状多層ブロー成形品の製
造方法は、樹脂押出装置のダイヘッド先端ノズルから複
数の樹脂を円筒状に押し出してその全体の肉厚が実質的
に均一である多層パリソンを形成し、三次元的に屈曲し
た形状に適合するキャビテイ溝を平面状又は曲面状の重
ね合わせ面に刻設した上金型及び下金型からなるブロー
成形用金型のうち開放状態の下金型のキャビテイ溝の中
心軸線上にダイヘッド先端ノズルが常時位置するように
該ダイヘッド先端ノズル又は下金型のどちらかを相対移
動させながら上記多層パリソンを該キャビテイ溝内に連
続注出し、ついで上金型を下金型に重ね合わせて多層パ
リソンをキャビテイ溝内に包蔵し、先端と後端を上下金
型の重ね合わせ面で閉塞した状態で多層パリソン内に圧
縮空気を注入するブロー成形法において、 上記ダイヘッド内での少なくとも多層パリソンの最外
層に対応する環状樹脂流通路を二つの区画領域に二分し
てそれぞれに異なる樹脂を流すとともに、その下流域の
両樹脂が円筒状に合流する両端二か所に揺動自在なフラ
ッピングネイルを設けて、 下金型のキャビテイ溝内に該多層パリソンを連続注出
する際の最外層区画境界線が、常時上下金型の合わせ面
に沿って略平行となるように上記二か所のフラッピング
ネイルの揺動による境界線の移動制御によって、 得られる成形品の長手方向の最外層に平行にそれぞれ
樹脂種が異なる上面側（又は前面側）と下面側（又は背
面側）の二つの区画領域を形成させることを特徴として
いる。In the method for producing a tubular multilayer blow-molded article of the present invention, a plurality of resins are extruded into a cylindrical shape from a die head tip nozzle of a resin extruding device to form a multilayer parison having a substantially uniform overall thickness. Of the mold for blow molding consisting of an upper mold and a lower mold, in which cavity grooves conforming to a three-dimensionally bent shape are engraved on a flat or curved overlapping surface While continuously moving either the die head tip nozzle or the lower die so that the die head tip nozzle is always positioned on the center axis of the cavity groove, the multi-layer parison is continuously poured into the cavity groove and then the upper die. Is stacked on the lower mold to enclose the multi-layer parison in the cavity groove, and compressed air is injected into the multi-layer parison with the front and rear ends closed by the upper and lower mold overlapping surfaces. In the low molding method, the annular resin flow passage corresponding to at least the outermost layer of the multi-layer parison in the die head is divided into two partition regions, and different resins are flown into each, and both resins in the downstream region are formed into a cylindrical shape. By providing swingable flapping nails at both ends where they merge, the boundary line of the outermost layer when continuously pouring the multi-layer parison into the cavity groove of the lower mold is always the mating surface of the upper and lower molds. By controlling the movement of the boundary line by swinging the flapping nails at the above two positions so that they are substantially parallel to each other, the upper surface side (or the different resin type) in parallel with the outermost layer in the longitudinal direction of the obtained molded product (or It is characterized in that two partitioned areas are formed on the front side) and the bottom side (or the back side).
【００１８】前記二か所のフラツピングネイルの揺動
は、上記ダイヘッド先端ノズル又は下金型のどちらかを
溝の方向に沿って相対移動させるときの進行方向からの
左右変位角度に応答してフラツピングネイルの揺動角度
を連続的に同一方向へ変位させるようにあらかじめ設定
されたプログラムに従わせることが好ましい。これによ
ってパリソン吐出方向の区画境界線位置を円周方向にず
らして長手方向の最外層に平行な二つの区画領域を形成
させることができる。The swinging of the two flapping nails is responsive to the horizontal displacement angle from the traveling direction when the die head tip nozzle or the lower die is relatively moved along the direction of the groove. It is preferable that the swing angle of the flapping nail is made to follow a preset program for continuously displacing in the same direction. As a result, the position of the partition boundary line in the parison discharge direction can be shifted in the circumferential direction to form two partition regions parallel to the outermost layer in the longitudinal direction.
【００１９】本願発明の管状多層ブロー成形品におい
て、最外層で外表面の要求される方向とは、例えば全体
形状が三次元的に屈曲した最外層の全ての上半面部分
（又は前面側）を美観に優れた樹脂で形成し、一方最外
層の下半面部分（又は背面側）は剛性の高い硬質樹脂で
形成するような場合である。また本発明の成形品で、最
内層は最外層に使用される硬質樹脂とは異なる軟質樹脂
で形成し、この軟質樹脂の肉厚比を高めることにより可
撓性を有する部分を少なくとも１箇所は持たせる。この
可撓性を有する部分は、自動車等でのステーやブラケッ
ト等へ装着する自由度が高められるところであればよ
く、屈曲部分或いは特定の直線部分であってもよい。In the tubular multilayer blow-molded article of the present invention, the required direction of the outer surface of the outermost layer is, for example, the entire upper half surface portion (or front surface side) of the outermost layer whose overall shape is three-dimensionally bent. This is a case where the resin is formed of a resin having an excellent appearance, while the lower half surface portion (or the back surface side) of the outermost layer is formed of a hard resin having high rigidity. Further, in the molded article of the present invention, the innermost layer is formed of a soft resin different from the hard resin used for the outermost layer, and at least one flexible portion is formed by increasing the thickness ratio of the soft resin. To have. This flexible portion may be a bent portion or a specific straight portion as long as it can be attached to a stay, a bracket or the like in an automobile or the like with a high degree of freedom.
【００２０】本発明の管状多層ブロー成形品の製造方法
では、最外層及び最内層を有する２層以上であって、最
外層が横断面の円周方向に沿って略２等分された２つの
区画領域を有する多層パリソンを、従来公知のコネクシ
ョンブロー成形法ないしエクスチェジブロー成形法をベ
ースにした俗に３次元ブロー成形法と呼ばれる側バリ無
しブロー成形法を利用するものである。この場合、多層
パリソンを形成する上記ダイヘッド内の少なくとも管状
パリソン最外層に対応する環状樹脂流通路を二つの区画
領域に二分してそれぞれに異なる樹脂を流すとともに、
その下流域で両樹脂が円筒状に両端で合流する部分に揺
動自在な２個のフラッピングネイルを設置して、パリソ
ン射出工程中にダイヘッドの下側金型半体に対する相対
移動に合わせてあらかじめ設定されたプログラムに従っ
て揺動させる。In the method for producing a tubular multilayer blow-molded article of the present invention, two or more layers having an outermost layer and an innermost layer, the outermost layer being divided into two substantially equal parts along the circumferential direction of the cross section, are used. A multi-layer parison having a partitioned region is formed by a side burr-free blow molding method commonly called a three-dimensional blow molding method based on the conventionally known connection blow molding method or Exchezi blow molding method. In this case, the annular resin flow passage corresponding to at least the tubular parison outermost layer in the die head forming the multi-layer parison is divided into two divided regions, and different resins are flown into each of the divided regions,
In the downstream region, two flapping nails that can be swung are installed in the part where both resins join in a cylindrical shape at the both ends, according to the relative movement with respect to the lower die half of the die head during the parison injection process. Shake according to a preset program.
【００２１】この二か所のフラツピングネイルの揺動制
御は、上記ダイヘッド先端ノズル又は下金型のどちらか
を溝の方向に沿って相対移動させるときの進行方向から
の左右変位角度の程度に応答してフラツピングネイルの
揺動角度を連続的に同一方向へ変位させるようにあらか
じめ設定されたプログラムに従って揺動させる。これに
よってパリソン最外層の２区画を仕切る境界線の位置を
適宜移動させられるために、成形品外表面の２つの半面
のうちの一方だけがあらかじめ決められた方向に向き、
もう一方の半面は一部分でも決してその方向に向かない
ように自由に制御させることができる。The rocking control of the flapping nails at these two positions is controlled to the extent of the horizontal displacement angle from the advancing direction when either the die head tip nozzle or the lower die is relatively moved along the groove direction. In response, the flapping nail is oscillated according to a program preset to continuously displace the oscillating angle in the same direction. This allows the position of the boundary line that separates the two sections of the parison outermost layer to be appropriately moved, so that only one of the two half surfaces of the outer surface of the molded product faces in a predetermined direction,
The other half can be freely controlled so that even one part never faces in that direction.
【００２２】上記手段でパリソン最外層の２区画を仕切
る境界線の位置を移動制御させることはブロー成形機の
ダイヘッド内に組み込まれたフラッピングネイル装置の
動作をダイヘッドの下側金型半体に対する相対移動の仕
方に同調させて制御することで実施でき、また最外層と
最内層の層厚比をパリソン長手方向に沿って変化させる
制御とは独立に行うことができる。すなわち、最外層の
区画境界の移動はダイヘッド内の当該樹脂の流路形状を
機械的に変更することによって行われ、また最外層と最
内層の層厚比の変化は当該樹脂の流量調整によって行わ
れるので、これら手段を行使することが各層各区画を形
成する樹脂のパリソン段階での物性に影響を及ぼすこと
もなければ、逆に使用される樹脂の物性如何でこれら手
段が行使できなくなる等の影響を受けることもない。By controlling the movement of the position of the boundary line that divides the outermost layer of the parison by the above means, the operation of the flapping nail device incorporated in the die head of the blow molding machine is performed with respect to the lower die half of the die head. This can be performed by controlling in synchronization with the manner of relative movement, and can be performed independently of the control of changing the layer thickness ratio of the outermost layer and the innermost layer along the parison longitudinal direction. That is, the boundary of the outermost layer is moved by mechanically changing the flow path shape of the resin in the die head, and the layer thickness ratio between the outermost layer and the innermost layer is changed by adjusting the flow rate of the resin. Therefore, the use of these means does not affect the physical properties of the resin forming each section of each layer at the parison stage, and conversely, the use of these means makes it impossible to use these means. Not affected.
【００２３】[0023]
【発明の実施の形態】以下に本発明の発明の実施の形態
を説明する。前述した如く図３及び図４に示した従来の
３次元ブロー成形法では、得られる成形品は図５に示さ
れた成形品の（ａ）部分及び（ｃ）部分ではＡ樹脂が成
形品の上半面にきているが、（ａ）部分の進行方向から
左側へ略９０度だけ屈曲した成形品の（ｂ）部分ではそ
うではなく、成形品の左半面にきているものしか得られ
ない。これに対して本発明では、図１に示したようにＡ
樹脂の区画を常に成形品上半面側（又は前面側）に一方
Ｂ樹脂の区画を常に下面側（又は背面側）に持ってくる
ように多層パリソンの外層の境界線の移動制御を行う。
この場合は図５における射出時のパリソンの成形品
（ｂ）部分に対応する箇所のパリソンの区画境界線４を
図６に模式的に示すように、あらかじめ角度略９０度だ
け円周方向へずらす制御を行うことによって得たもので
ある。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. As described above, in the conventional three-dimensional blow molding method shown in FIGS. 3 and 4, the obtained molded product is the resin A in the parts (a) and (c) of the molded product shown in FIG. Although it is on the upper half surface, it is not so in the part (b) of the molded product bent to the left side from the traveling direction of the part (a) by about 90 degrees, and only the part that is on the left half surface of the molded product can be obtained. . On the other hand, in the present invention, as shown in FIG.
The movement control of the boundary line of the outer layer of the multi-layer parison is performed so that the resin section is always brought to the upper half surface side (or the front surface side) of the molded article and the B resin section is always brought to the lower surface side (or the back surface side).
In this case, the parison division boundary line 4 corresponding to the parison molded product (b) at the time of injection in FIG. 5 is preliminarily shifted in the circumferential direction by an angle of approximately 90 degrees as schematically shown in FIG. It was obtained by controlling.
【００２４】このパリソン外層の２区画を仕切る境界線
４の移動制御をおこなわせるために、本発明では、図３
や図４における多層ダイヘッド３の内部にフラッピング
ネイルと呼ばれる部品を組み込んだダイヘッドを利用す
る。図７にフラッピングネイル８を装着した多層ダイヘ
ッド３の先端部分の最外層樹脂流路の一部切り欠き断面
の模式図を示す。多層パリソンを形成する上記ダイヘッ
ド３内の少なくとも管状パリソン最外層に対応する環状
樹脂流通路９の上流側を二つの区画領域１０，１１に二
分してそれぞれに異なる樹脂を流すとともに、その下流
域で両樹脂が円筒状に両端で合流してパリソン最外層９
を形成する付近に外部の駆動手段の連結腕１２で揺動自
在とされた２個のフラッピングネイル８を設置してい
る。In order to control the movement of the boundary line 4 that divides the two sections of the parison outer layer, in the present invention, FIG.
Also, a die head in which a component called flapping nail is incorporated inside the multilayer die head 3 in FIG. FIG. 7 shows a schematic view of a partially cutaway cross section of the outermost layer resin flow path at the tip portion of the multilayer die head 3 having the flapping nail 8 mounted thereon. In the die head 3 forming the multi-layer parison, at least the upstream side of the annular resin flow passage 9 corresponding to the outermost layer of the tubular parison is divided into two partitioned regions 10 and 11, and different resins are flown into each of the divided regions 10, 11 The outermost layer 9 of the parison is formed by joining both resins in a cylindrical shape at both ends.
Two flapping nails 8 that are swingable by a connecting arm 12 of an external driving means are installed near the area where the flapping nail 8 is formed.
【００２５】また図８にフラッピングネイル８の取り付
け箇所の断面の模式図を示す。パリソン射出工程中にダ
イヘッドの下側金型半体に対する相対移動に合わせてあ
らかじめ設定されたプログラムに従ってフラッピングネ
イル８を揺動させる。例えば図５の場合は、（ａ）部分
の進行方向から（ｂ）部分の進行方向へ略９０度に変位
しているので、２区画を仕切る境界線４が、これに追随
するようにフラツピングネイル８の揺動角度も円周方向
で略９０度変位するように進行速度に合わせて制御す
る。かかる制御方式は、キャビテイ溝の屈曲程度及び長
さに応じてあらかじめ進行過程をプログラム化して、電
気的にまたは機械的な設定により自動的に行うことがで
きる。Further, FIG. 8 shows a schematic view of a cross section of a mounting portion of the flapping nail 8. During the parison injection process, the flapping nail 8 is swung according to a preset program in accordance with the relative movement of the die head with respect to the lower mold half. For example, in the case of FIG. 5, since it is displaced by approximately 90 degrees from the traveling direction of the portion (a) to the traveling direction of the portion (b), the boundary line 4 partitioning the two sections is flattened so as to follow it. The swing angle of the nail 8 is also controlled according to the traveling speed so as to be displaced by approximately 90 degrees in the circumferential direction. In such a control method, the progress process can be programmed in advance according to the bending degree and length of the cavity groove, and can be automatically performed by electrical or mechanical setting.
【００２６】[0026]
【実施例】以下、本発明の具体的な実施例を説明する。
図１は本発明の実施例にかかる管状多層ブロー成形品６
の模式図を示す。成形品６は三次元的に屈曲したダクト
状製品の試作品で、 Ａ樹脂の区画を常に成形品上半面
（又は前面側）に一方Ｂ樹脂の区画を常に下面側（又は
背面側）になるように長手方向の最外層に平行な境界線
で仕切られた二つの区画領域を形成させたものである。
寸法は長手方向が約１００ｃｍ，横断面の径が約１０ｃ
ｍである。層構成は２層で、使用樹脂は外層の上半面側
（図中のＡ樹脂）が表面精度及び光沢度の良好なポリア
ミド樹脂ＰＡ６で、外層の下半面側（図中のＢ樹脂）が
剛性、耐熱性等に優れたガラス繊維強化ポリアミド樹脂
ＧＦ−ＰＡ６である。また内層（図中のＣ樹脂）は柔軟
性が高く、ＰＡ６ともＧＦ−ＰＡ６とも接着性良好で、
しかも一般に加水分解に弱いとされるポリアミド系樹脂
の中では加水分解に強いＰＡ１１である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described.
FIG. 1 shows a tubular multilayer blow molded product 6 according to an embodiment of the present invention.
FIG. Molded product 6 is a prototype of a three-dimensionally bent duct-shaped product. The A resin section is always on the upper half surface (or front side) of the molded article, while the B resin section is always on the lower surface side (or back side). As described above, two partitioned areas are formed, which are partitioned by a boundary line parallel to the outermost layer in the longitudinal direction.
The size is about 100 cm in the longitudinal direction and the diameter of the cross section is about 10 c.
m. The layer structure is two layers. The resin used is polyamide resin PA6, which has good surface accuracy and gloss on the upper half surface side (A resin in the figure) of the outer layer, and is rigid on the lower half surface side (B resin in the figure) of the outer layer. The glass fiber reinforced polyamide resin GF-PA6 having excellent heat resistance. Further, the inner layer (C resin in the figure) has high flexibility, and has good adhesiveness to both PA6 and GF-PA6,
Moreover, among polyamide-based resins which are generally considered to be weak against hydrolysis, PA11 is resistant to hydrolysis.
【００２７】この試作品は中を加熱水蒸気が通る箇所に
用いられるダクトを狙ったものである。ところで、こう
した寸法や樹脂組み合わせは、たまたま上記の使用目的
によってそのように選ばれただけのことで、成形品の寸
法及び樹脂選択等が本発明の本質に何の関係もないこと
は言うまでもない。すなわち、通常のブロー成形に適し
た熱可塑性樹脂ならば何でも本発明に使用することがで
きる。図２には本発明の他の実施例を示す成形品６の一
部切り欠き断面の模式図を示す。この場合には、内層
（Ｃ樹脂）の層厚が外層（Ａ，Ｂ樹脂）の層厚より著し
く厚くなっている箇所を直線部分に設けており、ここに
可撓性部分７を設けているものである。This prototype is aimed at a duct used at a location through which heated steam passes. By the way, it goes without saying that such dimensions and resin combinations happen to be selected according to the above-mentioned purpose of use, and that the dimensions and resin selection of the molded article have nothing to do with the essence of the present invention. That is, any thermoplastic resin suitable for ordinary blow molding can be used in the present invention. FIG. 2 shows a partially cutaway schematic view of a molded product 6 showing another embodiment of the present invention. In this case, a portion where the layer thickness of the inner layer (C resin) is significantly thicker than the layer thickness of the outer layer (A, B resin) is provided in the linear portion, and the flexible portion 7 is provided therein. It is a thing.
【００２８】[0028]
【発明の効果】以上述べたように、本発明のブロー成形
品は例えば三次元的に屈曲した長尺のダクト状製品であ
って、可撓性のある部分を少なくとも１個所有し、かつ
外表面の要求される方向（例えば上面側又は前面側）だ
けに向いた半面とその反対側（例えば下面側又は背面
側）の半面とに異なる物性を持つ樹脂を配置できるの
で、主に自動車アンダーフード（エンジンルーム内）等
の可撓性を有する吸気系ダクトやパイプ等に取り付けた
ときの美観に優れたものとすることができる。その他こ
れまで用いられていなかったいろいろの分野にも使用で
きる価値の高いダクト類を提供することができ、今後の
ブロー成形品の用途拡大に著しく貢献するものである。As described above, the blow-molded product of the present invention is, for example, a three-dimensionally bent long duct-shaped product, which has at least one flexible portion and has an outer surface. Since it is possible to place a resin having different physical properties on the half surface facing only the required direction of the surface (for example, the upper surface side or the front surface side) and the half surface on the opposite side (for example, the lower surface side or the back surface side), it is mainly an automobile underhood. It can be made to have an excellent appearance when attached to a flexible intake system duct, pipe, or the like (in the engine room). In addition, it is possible to provide ducts of high value that can be used in various fields that have not been used up to now, and it will significantly contribute to future expansion of applications of blow-molded products.
【図１】本発明の一実施例を示す管状ブロー成形品の斜
視図である。FIG. 1 is a perspective view of a tubular blow-molded product showing an embodiment of the present invention.
【図２】本発明の一実施例を示す管状ブロー成形品の一
部切り欠き斜視図である。FIG. 2 is a partially cutaway perspective view of a tubular blow-molded article showing an embodiment of the present invention.
【図３】３次元ブロー成形法（Ｙ軸方向移動）を示す模
式図である。FIG. 3 is a schematic diagram showing a three-dimensional blow molding method (movement in the Y-axis direction).
【図４】３次元ブロー成形法（Ｘ軸方向移動）を示す模
式図である。FIG. 4 is a schematic diagram showing a three-dimensional blow molding method (movement in the X-axis direction).
【図５】従来の３次元ブロー成形法で得られる管状ブロ
ー成形品の斜視図である。FIG. 5 is a perspective view of a tubular blow molded product obtained by a conventional three-dimensional blow molding method.
【図６】本発明におけるパリソンの区画境界線の移動状
況を示す模式図である。FIG. 6 is a schematic diagram showing a moving state of a parison boundary line according to the present invention.
【図７】本発明に利用する多層ダイヘッドの一部切り欠
き縦断面図である。FIG. 7 is a partially cutaway vertical sectional view of a multilayer die head used in the present invention.
【図８】フラッピングネイルの取り付け箇所を示す要部
断面図である。FIG. 8 is a cross-sectional view of essential parts showing attachment points for flapping nails.
１ 下金型 ２ キャビテイ溝 ３ 多層ダイヘッド ４ 境界線 ５ 多層パリソン ６ 管状ブロー成形品 ７ 可撓性部分 ８ フラッピングネイル ９ 最外層の樹脂流通路 １０ 最外層の上流側の区画領域 １１ 最外層の上流側の区画領域 １２ 外部の駆動手段の連結腕 1 Lower Mold 2 Cavity Groove 3 Multilayer Die Head 4 Boundary Line 5 Multilayer Parison 6 Tubular Blow Molded Product 7 Flexible Part 8 Flapping Nail 9 Outermost Resin Flow Passage 10 Outermost Partition Area 11 Outermost Layer Upper division area 12 Connecting arm for external driving means
Claims (5)
実質的に均一である管状多層ブロー成形品であって、管
壁内外各層の肉厚比が長手方向に沿って変化した部分を
有し、少なくとも最外層は外表面の要求される方向だけ
に向いた半面とその反対側の半面の二つの区画領域から
形成されており、かつ内層を形成する樹脂種は、最外層
を形成している二つの区画領域の樹脂種のうちの少なく
とも一方と異なることを特徴とする管状多層ブロー成形
品。1. A tubular multi-layer blow-molded product having a three-dimensionally bent overall shape and a substantially uniform wall thickness, in which the wall thickness ratio of each layer inside and outside the tube wall changes along the longitudinal direction. At least the outermost layer is formed from two partitioned regions of the half surface facing only the required direction of the outer surface and the opposite half surface, and the resin species forming the inner layer is the outermost layer. A tubular multi-layer blow-molded article, characterized in that it is different from at least one of the resin species of the two partitioned areas being formed.
れ樹脂種が異なる上面側（又は前面側）と下面側（又は
背面側）の二つの区画領域から形成されていることを特
徴とする請求項１記載の管状多層ブロー成形品。2. The outermost layer is formed in parallel with all the longitudinal directions from two partitioned regions of an upper surface side (or front surface side) and a lower surface side (or back surface side) of different resin species. The tubular multilayer blow-molded product according to claim 1.
て変化した部分で内層側に配置した軟質性樹脂層の肉厚
比を高くして可撓性（変形性）を備えていることを特徴
とする請求項１又は請求項２記載の管状多層ブロー成形
品。3. The flexibility (deformability) is provided by increasing the wall thickness ratio of the soft resin layer disposed on the inner layer side at the portion where the wall thickness ratio of the inner and outer layers of the tube wall changes along the longitudinal direction. The tubular multilayer blow-molded product according to claim 1 or 2, characterized in that
ら複数の樹脂を円筒状に押し出してその全体の肉厚が実
質的に均一である多層パリソンを形成し、三次元的に屈
曲した形状に適合するキャビテイ溝を平面状又は曲面状
の重ね合わせ面に刻設した上金型及び下金型からなるブ
ロー成形用金型のうち開放状態の下金型のキャビテイ溝
の中心軸線上にダイヘッド先端ノズルが常時位置するよ
うに該ダイヘッド先端ノズル又は下金型のどちらかを相
対移動させながら上記多層パリソンを該キャビテイ溝内
に連続注出し、ついで上金型を下金型に重ね合わせて多
層パリソンをキャビテイ溝内に包蔵し、先端と後端を上
下金型の重ね合わせ面で閉塞した状態で多層パリソン内
に圧縮空気を注入するブロー成形法において、 上記ダイヘッド内での少なくとも多層パリソンの最外
層に対応する環状樹脂流通路を二つの区画領域に二分し
てそれぞれに異なる樹脂を流すとともに、その下流域の
両樹脂が円筒状に合流する両端二か所に揺動自在なフラ
ッピングネイルを設けて、 下金型のキャビテイ溝内に該多層パリソンを連続注出
する際の最外層区画境界線が、常時上下金型の合わせ面
に沿って略平行となるように上記二か所のフラッピング
ネイルの揺動による境界線の移動制御によって、 得られる成形品の長手方向の最外層に平行にそれぞれ
樹脂種が異なる上面側（又は前面側）と下面側（又は背
面側）の二つの区画領域を形成させることを特徴とする
管状多層ブロー成形品の製造方法。4. A plurality of resins are extruded in a cylindrical shape from a die head tip nozzle of a resin extruding device to form a multi-layer parison having a substantially uniform overall thickness, and adapted to a three-dimensionally bent shape. The die head tip nozzle is located on the center axis of the cavity groove of the open lower die of the blow molding die consisting of the upper die and the lower die with cavity grooves engraved on the flat or curved overlapping surface. The multilayer parison is continuously poured into the cavity groove while relatively moving either the nozzle of the die head tip or the lower mold so that it is always positioned, and then the upper mold is superposed on the lower mold so that the multilayer parison is cavitated. In a blow molding method in which compressed air is injected into a multi-layer parison in a state where it is enclosed in a groove and the front end and the rear end are closed by the overlapping surfaces of the upper and lower molds, In addition, the annular resin flow passage corresponding to the outermost layer of the multi-layer parison is divided into two partitioned areas, and different resins are flown into each of the two partitioned areas, and it is possible to swing at both ends where both resins in the downstream area join in a cylindrical shape. A flapping nail is provided so that the boundary line of the outermost layer when continuously pouring the multi-layer parison into the cavity groove of the lower mold is always substantially parallel along the mating surfaces of the upper and lower molds. By controlling the movement of the boundary line by oscillating flapping nails at two locations, the upper surface side (or front surface side) and the lower surface side (or rear surface side) of different resin types are parallel to the outermost layer in the longitudinal direction of the obtained molded product. 2.) A method for producing a tubular multi-layer blow-molded article, characterized in that the two partitioned areas of (1) are formed.
上記ダイヘッド先端ノズル又は下金型のどちらかを溝の
方向に沿って相対移動させるときの進行方向からの左右
変位角度に応答してフラツピングネイルの揺動角度を連
続的に同一方向へ変位させるようにあらかじめ設定され
たプログラムに従わせることを特徴とする請求項４記載
の多層ブロー成形法。5. The swinging of the flapping nails at two locations is
The swing angle of the frapping nail is continuously displaced in the same direction in response to the horizontal displacement angle from the traveling direction when either the die head tip nozzle or the lower die is relatively moved along the groove direction. The multi-layer blow molding method according to claim 4, wherein the preset program is followed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8046388A JPH09239817A (en) | 1996-03-04 | 1996-03-04 | Tubular multilayered blow molded product and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8046388A JPH09239817A (en) | 1996-03-04 | 1996-03-04 | Tubular multilayered blow molded product and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09239817A true JPH09239817A (en) | 1997-09-16 |
Family
ID=12745769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8046388A Withdrawn JPH09239817A (en) | 1996-03-04 | 1996-03-04 | Tubular multilayered blow molded product and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09239817A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1832409A2 (en) * | 2006-03-06 | 2007-09-12 | GEPOC Verfahrenstechnik GmbH | Method for manufacturing a thermoplastic hose |
| JP2007290405A (en) * | 1999-03-24 | 2007-11-08 | 3Dm Internatl Inc | Molded article retaining properties of individual materials and its manufacturing method |
| KR101446200B1 (en) * | 2013-01-14 | 2014-10-01 | 박철재 | Manufacturing apparatus for air cushion and air cushion thereof |
| CN107696454A (en) * | 2017-11-08 | 2018-02-16 | 东莞市丰泰日用品有限公司 | A kind of preparation method of twoport thread cup |
| CN108688436A (en) * | 2017-04-11 | 2018-10-23 | 福特汽车公司 | The extrusion of multi-layer blow molding |
| JP2019217247A (en) * | 2018-06-15 | 2019-12-26 | 株式会社チャナカンパニー | Garment hanger |
| CN112325037A (en) * | 2020-09-30 | 2021-02-05 | 上海众友橡塑制品有限公司 | Wear-resisting type rubber tube |
-
1996
- 1996-03-04 JP JP8046388A patent/JPH09239817A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007290405A (en) * | 1999-03-24 | 2007-11-08 | 3Dm Internatl Inc | Molded article retaining properties of individual materials and its manufacturing method |
| EP1832409A2 (en) * | 2006-03-06 | 2007-09-12 | GEPOC Verfahrenstechnik GmbH | Method for manufacturing a thermoplastic hose |
| EP1832409A3 (en) * | 2006-03-06 | 2010-11-10 | GEPOC Verfahrenstechnik GmbH | Method for manufacturing a thermoplastic hose |
| KR101446200B1 (en) * | 2013-01-14 | 2014-10-01 | 박철재 | Manufacturing apparatus for air cushion and air cushion thereof |
| CN108688436A (en) * | 2017-04-11 | 2018-10-23 | 福特汽车公司 | The extrusion of multi-layer blow molding |
| CN107696454A (en) * | 2017-11-08 | 2018-02-16 | 东莞市丰泰日用品有限公司 | A kind of preparation method of twoport thread cup |
| JP2019217247A (en) * | 2018-06-15 | 2019-12-26 | 株式会社チャナカンパニー | Garment hanger |
| CN112325037A (en) * | 2020-09-30 | 2021-02-05 | 上海众友橡塑制品有限公司 | Wear-resisting type rubber tube |
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