JPS604748Y2 - Circular die for two-layer plastic extrusion - Google Patents
Circular die for two-layer plastic extrusionInfo
- Publication number
- JPS604748Y2 JPS604748Y2 JP1979177807U JP17780779U JPS604748Y2 JP S604748 Y2 JPS604748 Y2 JP S604748Y2 JP 1979177807 U JP1979177807 U JP 1979177807U JP 17780779 U JP17780779 U JP 17780779U JP S604748 Y2 JPS604748 Y2 JP S604748Y2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- die
- bolt
- adjustment
- bolts
- 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
Links
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
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は鋼管等にプラスチック類を二層被覆し、もしく
はプラスチックの二層管を製造する場合、二層各々の厚
み調整を容易にしたサーキュラ−ダイに関するものであ
る。[Detailed Description of the Invention] The present invention relates to a circular die that facilitates adjustment of the thickness of each of the two layers when a steel pipe or the like is coated with two layers of plastic or a two-layer plastic pipe is manufactured.
鋼管の外周面にプラスチック類を二層被覆したり、二層
のプラスチック管を成形するに際して二層押出用サーキ
ュラ−ダイが用いられることはよく知られている。It is well known that a circular die for two-layer extrusion is used to coat the outer peripheral surface of a steel pipe with two layers of plastic or to form a two-layer plastic pipe.
第1図はその一例を示したもので、このサーキュラ−ダ
イは外ダイ1と中間ダイ2,2a並びに内ダイ3とから
構成され、これらによってダイ本体の内部円周方向に2
つの樹脂溜り4,4a及び・□樹脂導出用言9フ1部5
,5a並びにこれら樹脂導出用スリット部5,5aが1
つになった樹脂押出しリップ部6が形成されている。FIG. 1 shows an example of this, and this circular die is composed of an outer die 1, intermediate dies 2, 2a, and an inner die 3, which extend the inner circumferential direction of the die body.
Two resin reservoirs 4, 4a and □Resin derivation term 9fu 1 part 5
, 5a and these resin lead-out slit parts 5, 5a are 1
An extruded resin lip portion 6 is formed.
そして二種の溶融したプラスチック樹脂は、中間ダイ2
,2aに設けられた各人ロア、7aからそれぞれ入り、
樹脂溜り4,4aで全周に回った後、スリット部5.5
aを通過してリップ部6から銅体Pの外面に被覆され、
もしくはプラスチック管として成形されるものである。The two types of molten plastic resin are then transferred to the intermediate die 2.
, each person enters from the lower floor provided at 2a, 7a,
After going around the entire circumference in the resin reservoirs 4 and 4a, the slit part 5.5
a, and is coated on the outer surface of the copper body P from the lip part 6,
Or it can be molded as a plastic tube.
この場合プラスチックは円周方向に均一に押出されて膜
厚もしくは管厚としてバラツキのないものであることが
望ましい。In this case, it is desirable that the plastic be extruded uniformly in the circumferential direction, with no variation in film thickness or tube thickness.
このため従来ではライニング膜厚または管厚の調整を調
整ボルト8で行なており、即ちこの作業は中間ダイ2a
に挿設された調整ボルト8を押し引きし外ダイ1を半径
方向に動かすようにしていたものである。For this reason, in the past, the lining film thickness or tube thickness was adjusted using the adjustment bolt 8. In other words, this work was performed using the intermediate die 2a.
The outer die 1 is moved in the radial direction by pushing and pulling an adjustment bolt 8 inserted into the outer die 1.
しかし、このような従来のダイ構造では、中間ダイ2を
動かすことができないので、スリット部5しか調整する
ことができず、またその調整も固定ボルト9の通孔9a
における上下方向のガタ付き分が限度であり、成孔9a
を大きくすると、組立調整が困難となる。However, in such a conventional die structure, since the intermediate die 2 cannot be moved, only the slit portion 5 can be adjusted.
The limit is the amount of play in the vertical direction in the hole forming hole 9a.
If , it becomes difficult to assemble and adjust.
また、このような調整手段は、スリット部5における外
ダイ1と中間グイ2とが真円状態を保ち、単に互いの芯
がずれている場合には有効であるが、実際には各グイの
温度に加熱したり常温に戻したりするうちに、グイにひ
ずみが生じ、外ダイ1や中間グイ2の断面形状が略楕円
形状に変形し、こうなると従来の調整手段では膜厚や管
厚の調整が困難もしくは不可能となる。In addition, such adjustment means is effective when the outer die 1 and the intermediate gouer 2 in the slit portion 5 maintain a perfect circle state and are simply misaligned with each other, but in reality, each gou As the gou is heated to a high temperature or returned to room temperature, distortion occurs in the gou, and the cross-sectional shapes of the outer die 1 and the middle gou 2 deform into approximately elliptical shapes.When this happens, conventional adjustment means are unable to adjust the film thickness or tube thickness. Adjustment becomes difficult or impossible.
更にスリット部5の調整は従来固定ボルト9をゆるめ、
調整ボルト8を動かすという手順をとっているため、そ
の作業はライニング中にはできない。Furthermore, adjustment of the slit portion 5 is conventionally done by loosening the fixing bolt 9.
Since the procedure involves moving the adjustment bolt 8, this work cannot be done during lining.
また固定ボルト9を用いず、外ダイ1が中間ダイ2aに
固定され得るものとしても、調整ボルト8を調整する時
にかかる力の向きが管軸に垂直な向きであるため、中間
ダイ2aとこれに接合している中間台2及び内ダイ3が
その力の作用によって管軸垂直方向に微動し、周方向膜
厚が不均一になったり、グイ本体の一部が管体Pに接触
する事故が起き、やはりライニング中に行なうことはむ
ずかしく、膜厚調整が必要な場合には、その都度ライン
を停止せざるを得ないというのが実状であった。Furthermore, even if the outer die 1 can be fixed to the intermediate die 2a without using the fixing bolt 9, since the direction of the force applied when adjusting the adjusting bolt 8 is perpendicular to the tube axis, the intermediate die 2a and The intermediate stand 2 and inner die 3 that are connected to the goo may move slightly in the direction perpendicular to the tube axis due to the action of this force, resulting in uneven circumferential film thickness or accidents where part of the goo body comes into contact with the tube body P. This is difficult to do during lining, and the actual situation is that the line has to be stopped each time it is necessary to adjust the film thickness.
本考案はこのような従来の不利欠点を解決するために提
案されたものであり、前記グイ調整をライン稼動中にお
いても容易かつ確実に行ない、しかもプラスチック膜厚
または管厚の周方向のバラツキを均一化し得る新たなプ
ラスチック二層押出用サーキュラ−グイを提供しようと
するものである。The present invention was proposed in order to solve these conventional disadvantages, and it is possible to easily and reliably perform the above-mentioned guide adjustment even during line operation, and to eliminate circumferential variations in plastic film thickness or tube thickness. The present invention aims to provide a new circular gouer for extruding two-layer plastics that can be made uniform.
次に本考案の一実施例につき第2図及び第3図を参考に
して説明すると、まず第2図において10.11は両側
部外ダイ、12は中間部外ダイ、13は内グイであり、
前記両側部外グイ10,11と中間部外ダイ12とはそ
れぞれ複数の固定ボルト14.15によって固定され、
また側部外ダイ11と内ダイ13も同じく複数の固定ボ
ルト16によって固定されている。Next, an embodiment of the present invention will be explained with reference to FIGS. 2 and 3. First, in FIG. ,
The both side outer guides 10 and 11 and the intermediate outer die 12 are each fixed by a plurality of fixing bolts 14 and 15,
Further, the side outer die 11 and the inner die 13 are similarly fixed by a plurality of fixing bolts 16.
こうした各分割グイから構成されたグイ本体イの内部に
は2つの樹脂溜り17.18及びこの樹脂溜り17.1
8からそれぞれ延長した樹脂導出用スリット部19,2
0並びにリップ部21更に管体貫通孔Xが形成されてい
る。There are two resin reservoirs 17.18 and 17.1 inside the goo body made up of these divided gouies.
Resin lead-out slit parts 19 and 2 extended from 8 respectively.
0 and the lip portion 21, and further a tube through hole X is formed.
そして前記樹脂導出用スリット部19.20は被覆もし
くは成形される管体Pの軸芯に対して垂直に形成される
と共に、各スリット部19.20はそれぞれ前記リップ
部21に連通しているものである。The slit portions 19.20 for leading out the resin are formed perpendicularly to the axis of the pipe P to be coated or molded, and each slit portion 19.20 communicates with the lip portion 21. It is.
また前記樹脂導出用スリット部19.20における両側
部外ダイ10.11の内面には、それぞれ調整リング2
2,22aが中間部外ダイ12の対面方向に移動可能に
嵌入されると共に、前記グイ本体イの外側からは前記調
整リング22,22aに至る管軸方向に平行に引きボル
ト23,23a及び押えボルト24.24aをそれぞれ
組とした調整ボルトが挿入されている。Further, adjustment rings 2 are provided on the inner surfaces of the outer dies 10.11 on both sides of the resin lead-out slit portion 19.20, respectively.
2, 22a are fitted so as to be movable in the facing direction of the intermediate outer die 12, and from the outside of the gouer body A, pull bolts 23, 23a and a presser are inserted in parallel to the tube axis direction from the outside to the adjustment rings 22, 22a. Adjustment bolts each having a set of bolts 24 and 24a are inserted.
これら引きボルト23,23aと押えボルト24.24
aは、本実施例では第3図に示すごとく、中央部に押え
ボルト24または24a1その両側近傍に引きボルト2
3または23aを設け、これらを組としてグイ本体イに
おける両外側の円周方向に複数取り付けられている。These pull bolts 23, 23a and holding bolts 24, 24
In this embodiment, as shown in FIG.
3 or 23a, and a plurality of these are attached as a set in the circumferential direction on both outer sides of the goo body A.
第4図はかかる引きボルト23.23aと押えボルト2
4.24aのうち、−側の引きボルト23及び押えボル
ト24を例にとって詳示したものであり、Aは引きボル
ト23、Bは押えボルト24である。Figure 4 shows the tension bolt 23.23a and the holding bolt 2.
4.24a, the minus side pull bolt 23 and presser bolt 24 are shown in detail as an example, where A is the pull bolt 23 and B is the presser bolt 24.
即ち、引きボルト23は外ダイ10に設けられた通孔2
5に挿入され、その先端部は調整リング22に形成され
た螺部26に螺入せしめている。That is, the tension bolt 23 is inserted into the through hole 2 provided in the outer die 10.
5, and its tip is screwed into a threaded portion 26 formed on the adjustment ring 22.
また押えボルト24は同じく外ダイ10に形成された螺
孔27に螺入され、その先端部によって調整リング22
の背面28を押圧し得るようになっている。Further, the holding bolt 24 is screwed into a screw hole 27 similarly formed in the outer die 10, and the tip of the holding bolt 24 is inserted into the adjusting ring 22.
The back surface 28 of the device can be pressed.
こうした構成は他側の引きボルト23a及び押えボルト
24aも同じであるが、本実施例ではこれら引きボルト
23a及び押えボルト24aはグイ本体イの構成上、内
ダイ13の外側から貫通せしめている。This structure is the same for the pull bolt 23a and press bolt 24a on the other side, but in this embodiment, these pull bolt 23a and press bolt 24a are made to penetrate from the outside of the inner die 13 due to the structure of the goo body.
なお、図中において29.30はそれぞれ樹脂溜り17
.18に通じる入口である。In addition, in the figure, 29 and 30 are the resin reservoirs 17, respectively.
.. This is the entrance leading to 18.
以上は本考案の単なる一例を示したに過ぎず、引きボル
ト23.23aと押えボルト24,24aの配列や構造
、内ダイ13、各外ダイ10,11.12の形状等は図
示したようなものに限定されるものではない。The above is merely an example of the present invention, and the arrangement and structure of the tension bolts 23.23a and holding bolts 24, 24a, the shapes of the inner die 13 and the outer dies 10, 11.12, etc. are as shown in the drawings. It is not limited to things.
このような本考案によって管体Pにプラスチックを二重
被覆し、もしくは二重管を製造する場合、まず各入口2
9.30から入った二種の溶融プラスチックはそれぞれ
の樹脂溜り17.18を通って全周方向に回ると共に、
樹脂導出用スリット部19.20を経て1つのリップ部
21から押出され、管体Pの外周面に被覆されるか、も
しくは管として成形されるものである。When the pipe body P is double coated with plastic or a double pipe is manufactured according to the present invention, first, each inlet 2 is
The two types of molten plastics entering from 9.30 pass through their respective resin reservoirs 17.18 and rotate in the circumferential direction,
The resin is extruded from one lip part 21 through the slit parts 19 and 20 for leading out the resin, and is coated on the outer circumferential surface of the tubular body P or formed into a pipe.
この場合、膜厚または管厚の調整は、引きボルト23,
23a及び押えボルト24,24aにより調整リング2
2,22aを各樹脂導出用スリット部19.20の幅方
向に移動させ、そのクリアランスを調整することによっ
て行なわれる。In this case, the adjustment of the membrane thickness or pipe thickness is performed using the tension bolt 23,
23a and the holding bolts 24, 24a adjust the adjustment ring 2.
2, 22a in the width direction of each resin lead-out slit portion 19, 20 and adjust the clearance thereof.
即ち、まず樹脂導出用スリット部19.20の幅を狭め
るときは、あらかじめ引きボルト23,23aをゆるめ
て、外ダイ10または内ダイ13の外面10aまたは1
3aと各引きボルト部との間に所定のクリアランスを有
せしめ、次いで押えボルト24,24aをまわして調整
リング22,22aを押し込むと、その調整リング22
t22aは前記クリアランス分だけ中間外ダイ12方向
に動き、樹脂導出用スリット部19.20が狭められる
。That is, first, when narrowing the width of the resin lead-out slit portion 19.20, the tension bolts 23, 23a are loosened in advance, and the outer surface 10a or 1 of the outer die 10 or the inner die 13 is narrowed.
3a and each tension bolt part, and then turn the holding bolts 24, 24a and push in the adjustment rings 22, 22a.
t22a moves in the direction of the intermediate outer die 12 by the amount of the clearance, and the resin lead-out slit portions 19 and 20 are narrowed.
また、この樹脂導出用スリット部19.20を拡げる場
合には、押えボルト24,24aをゆるめた後、引きボ
ルト23.23aをまわして調整リング22.22aを
両側部外ダイ10.11の内面方向に引き寄せ、その後
、前記押えボルト24.24aをまわして調整リング2
2,22aの背面を押えるものである。In addition, when widening this resin lead-out slit part 19.20, after loosening the holding bolts 24, 24a, turn the pull bolt 23.23a and adjust the adjustment ring 22.22a on the inner surface of the outer die 10.11 on both sides. direction, and then turn the holding bolt 24.24a to tighten the adjustment ring 2.
2, 22a.
このような三つのポル)23,24.23の組合せによ
り、調整リング22をボルト1つで押圧するとした時に
押圧点を中心にその両側にできる該リング22の凸部の
発生を防ぐことができ、周方向膜厚均一化を容易且つ完
全に行なうことが出きる。The combination of these three poles 23, 24, and 23 can prevent the generation of convex portions of the ring 22 that are formed on both sides of the pressing point when the adjusting ring 22 is pressed with one bolt. , it is possible to easily and completely uniformize the film thickness in the circumferential direction.
以上説明したような本考案によれば、たとえ各外ダイや
内ダイの断面形状が熱等により変形しても、固定ボルト
14,15.16を取り外すことなしにそれぞれの樹脂
導出用スリット部19,20のクリアランス調整を容易
確実に行なうことができ、そのため各層温方向の膜厚や
管厚を均一化することができ、しかもボルトを調整する
時にかける力の向きが管軸に平行な向きであるため、膜
厚が周方向で不均一になったり、グイ本体が管体にふれ
ることがなく、ライニング中であっても膜厚の調整が可
能である等種々のすぐれた長所が得られるものである。According to the present invention as explained above, even if the cross-sectional shape of each outer die or inner die is deformed due to heat or the like, each resin lead-out slit portion 19 can be fixed without removing the fixing bolts 14, 15, 16. , 20 can be easily and reliably adjusted, making it possible to equalize the film thickness and pipe thickness in each layer temperature direction, and furthermore, the direction of the force applied when adjusting the bolt is parallel to the pipe axis. Because of this, the film thickness does not become uneven in the circumferential direction, the goo body does not touch the pipe body, and the film thickness can be adjusted even during lining, etc., and has various excellent advantages. It is.
第1図は従来のプラスチック二層押出用サーキュラ−ダ
イを示す断面図、第2図は本考案の一実施例を示すプラ
スチック二層押出用サーキュラ−ダイの断面図、第3図
は第2図の右側面図、第4図イは本考案はおける引きボ
ルト構造を示す断面拡大図、第4図口は同じく押えボル
ト構造を示す拡大断面図である。
図中、10.11は両側部外グイ、12は中間部外グイ
、13は内グイ、14,15.16は固定ボルト、17
.18は樹脂溜り、19.20は樹脂導出用スリット部
、21はリップ部、22゜22aは調整リング、23,
23aは引きボルト、24.24aは押えボルト、25
は通孔、26は螺部、27は螺孔、28は背面、29.
30は入口、イはグイ本体、Pは管体である。Fig. 1 is a sectional view showing a conventional circular die for extruding two layers of plastic, Fig. 2 is a sectional view of a circular die for extruding two layers of plastic showing an embodiment of the present invention, and Fig. 3 is a sectional view of a circular die for extruding two layers of plastic. FIG. 4A is an enlarged cross-sectional view showing the tension bolt structure of the present invention, and FIG. 4A is an enlarged cross-sectional view showing the holding bolt structure. In the figure, 10.11 is an outer guide on both sides, 12 is an outer guide in the middle, 13 is an inner guide, 14, 15.16 is a fixing bolt, 17
.. 18 is a resin reservoir, 19.20 is a slit portion for leading out the resin, 21 is a lip portion, 22° 22a is an adjustment ring, 23,
23a is a pull bolt, 24.24a is a presser bolt, 25
26 is a through hole, 26 is a threaded portion, 27 is a threaded hole, 28 is a back surface, 29.
30 is an inlet, A is a goo body, and P is a pipe body.
Claims (1)
て周方向に2つの樹脂溜り及び2つの樹脂導出用スリッ
ト部並びに1つめ樹脂押出しリップ部更に管体貫通孔を
構成せしめ、かつ前記各樹脂導出用スリット部を、戒モ
モしくは被覆される管体の管軸に対して垂直に形成する
と共に、前記各両側部外ダイにおける樹脂導出用スリッ
ト部の対応部にそれぞれ調整リングを管軸方向に平行に
移動可能に嵌装し、しかも中央を押えボルト及びその両
側近傍を引きボルトとしてこれらを組とした調整ボルト
をその外ダイの外側から前記調整リングに至る管軸方向
に平行に挿入し且つこれらの調整ボルトの組みをその調
整リングの周方向に複数設けたことを特徴とするプラス
チック二層押出用サーキュラ−ダイ。Two resin reservoirs, two resin lead-out slits, a first resin extrusion lip, and a tube through hole are formed in the circumferential direction by one inner guide, outer dies on both sides, and outer die at the middle, and each of the above-mentioned A resin lead-out slit part is formed perpendicularly to the tube axis of the pipe body to be coated, and an adjustment ring is installed at the corresponding part of the resin lead-out slit part in each of the outer dies on both sides, respectively, so as to align the resin lead-out slit part with the tube axis. Adjustment bolts are fitted so as to be movable in parallel to the direction of the tube, with a holding bolt in the center and tension bolts near both sides of the holding bolt, and an adjustment bolt made up of these bolts is inserted parallel to the tube axis direction from the outside of the outer die to the adjustment ring. A circular die for extruding two-layer plastics, characterized in that a plurality of sets of these adjusting bolts are provided in the circumferential direction of the adjusting ring.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1979177807U JPS604748Y2 (en) | 1979-12-24 | 1979-12-24 | Circular die for two-layer plastic extrusion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1979177807U JPS604748Y2 (en) | 1979-12-24 | 1979-12-24 | Circular die for two-layer plastic extrusion |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5695823U JPS5695823U (en) | 1981-07-29 |
JPS604748Y2 true JPS604748Y2 (en) | 1985-02-12 |
Family
ID=29688372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1979177807U Expired JPS604748Y2 (en) | 1979-12-24 | 1979-12-24 | Circular die for two-layer plastic extrusion |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS604748Y2 (en) |
-
1979
- 1979-12-24 JP JP1979177807U patent/JPS604748Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5695823U (en) | 1981-07-29 |
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