JPH0761671B2 - Dies for perforated tubes - Google Patents
Dies for perforated tubesInfo
- Publication number
- JPH0761671B2 JPH0761671B2 JP63087861A JP8786188A JPH0761671B2 JP H0761671 B2 JPH0761671 B2 JP H0761671B2 JP 63087861 A JP63087861 A JP 63087861A JP 8786188 A JP8786188 A JP 8786188A JP H0761671 B2 JPH0761671 B2 JP H0761671B2
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- hole
- die body
- die
- resin
- 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
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
- B29C48/03—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
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は多孔チューブ用ダイスに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a die for a perforated tube.
従来、多孔チューブを形成する場合、第４図に示す様
に、エア供給孔ａを備えたマンドレルｂ…を、ニップル
ｃの先端に片持ばり状に突設し、該マンドレルｂを、リ
ング状のダイスｄ内に挿入状としたものが使用される。
つまり、樹脂を、ニップルｃの上流側からダイスｄ内へ
流し込んで複数本の該マンドレルｂ間に該樹脂を流し込
みながらマンドレルｂのエア供給孔ａからエアを流出し
て、該マンドレルｂにて形成されるチューブの孔の孔径
を所定の径となるようにしている。Conventionally, when forming a porous tube, as shown in FIG. 4, a mandrel b having an air supply hole a is projected at the tip of a nipple c in a cantilever shape, and the mandrel b is formed into a ring shape. An insert-shaped die is used.
That is, the resin is poured from the upstream side of the nipple c into the die d, and while the resin is being poured between the mandrels b, the air is discharged from the air supply hole a of the mandrel b and is formed by the mandrel b. The hole diameter of the tube to be formed is set to a predetermined diameter.
従来の技術で述べたものでは、樹脂は、ニップルｃに案
内されながらダイスｄ内に流入するが、通常、樹脂は、
粘弾性材のために、各マンドレルｂ間、及びマンドレル
ｂとダイスｄの内周面間における樹脂の流速が不均等と
なり、そのため、その間によって形成されるチューブの
薄肉部の肉厚寸法が不均等となる虞れがあった。特に、
最近の医療用カテーテルファイバのための多孔チューブ
は、ますます細径のものが要求され、薄肉部の寸法精度
は極めて厳しく要望されつつある。According to the conventional technique, the resin flows into the die d while being guided by the nipple c.
Due to the viscoelastic material, the flow velocity of the resin between the mandrels b and between the mandrel b and the inner peripheral surface of the die d becomes uneven, so that the wall thickness dimension of the thin portion of the tube formed between them is uneven. There was a risk of becoming. In particular,
Recent porous tubes for medical catheter fibers are required to have increasingly smaller diameters, and dimensional accuracy of thin-walled portions is being extremely demanded.
そこで、本発明では、従来のこのような問題点を解決し
て、寸法、形状が高精度の多孔チューブが得られる多孔
チューブ用ダイスを提供することを目的とする。Therefore, it is an object of the present invention to provide a die for a perforated tube in which such a conventional problem is solved and a porous tube having a highly precise size and shape can be obtained.
上記目的を達成するために、本発明における多孔チュー
ブ用ダイスは、ダイス本体の孔部内周面から複数の腕部
を突設すると共に該腕部の夫々の先端にマンドレルを連
設し、該マンドレルに、上記ダイス本体の外径方向から
のエアが上記腕部を介して供給されるエア供給孔を設け
ると共に、該エア供給孔の流出口を上記マンドレルの下
流側端面に開設した。In order to achieve the above object, the die for a perforated tube according to the present invention has a plurality of arm portions projecting from the inner peripheral surface of the hole portion of the die body, and a mandrel connected to the tip of each of the arm portions. And an air supply hole through which air from the outer diameter direction of the die main body is supplied via the arm portion is provided, and an outlet of the air supply hole is formed on the downstream end face of the mandrel.
マンドレルの直前に於ては上流からの樹脂が必ず一体状
に流れていることになり、その後において、つまり、ダ
イス本体の孔部内では樹脂の流速が均等となる。また、
マンドレルは腕部により所定の定位置に配設される。さ
らに、マンドレルに設けられるエア供給孔の流出口から
流出されるエアにより、チューブに形成される孔部の孔
径が所定の径寸法とされる。Immediately before the mandrel, the resin from the upstream always flows integrally, and thereafter, that is, the flow velocity of the resin becomes uniform in the hole of the die body. Also,
The mandrel is arranged at a predetermined fixed position by the arm portion. Further, the air flowing out from the outlet of the air supply hole provided in the mandrel causes the hole diameter of the hole formed in the tube to have a predetermined diameter.
以下、実施例について図面を参照して説明する。 Hereinafter, embodiments will be described with reference to the drawings.
第１図と第２図は本発明に係る多孔チューブ用ダイスを
示し、このダイスは、ニップル１の下流側に配設される
ダイス本体２と、該ダイス本体２内に挿通状として配設
されるマンドレル３と、を備え、ニップル１の上流側か
ら押出された樹脂が該ダイス本体２内に流れ込んで、第
３図に示す様に、複数の孔部５…を有する多孔チューブ
４を形成するものである。FIG. 1 and FIG. 2 show a die for a perforated tube according to the present invention. The die has a die body 2 disposed downstream of the nipple 1, and is disposed in the die body 2 as an insert shape. And a mandrel 3 which is provided with the mandrel 3, and the resin extruded from the upstream side of the nipple 1 flows into the die body 2 to form a perforated tube 4 having a plurality of holes 5, ... As shown in FIG. It is a thing.
しかして、ダイス本体２は、円孔状の孔部22を有し、そ
の内周面22aから複数の腕部６が突設され、該腕部６の
先端に上記マンドレル３が連設される。Thus, the die body 2 has a hole portion 22 having a circular hole shape, a plurality of arm portions 6 are projectingly provided from the inner peripheral surface 22a thereof, and the mandrel 3 is continuously provided at the tip of the arm portion 6. .
そして、マンドレル３は、上流端3aが丸味のある流線形
の略円錐状とされる横断面円形の棒状体からなる。即ち
砲弾形である。The mandrel 3 is a rod-shaped body having a circular cross-section whose upstream end 3a has a rounded streamlined substantially conical shape. That is, it is a bullet shape.
また、このマンドレル３には、ダイス本体２の外径方向
からエアが腕部６を介して供給されるエア供給孔10が設
けられている。そして、エア供給孔10の軸心はマンドレ
ル３の軸心と一致させると共に、このエア供給孔10の流
出孔10aは、マンドレル３の下流側端面11に開設され
る。Further, the mandrel 3 is provided with an air supply hole 10 through which air is supplied from the outer diameter direction of the die body 2 through the arm portion 6. The axis of the air supply hole 10 coincides with the axis of the mandrel 3, and the outflow hole 10a of the air supply hole 10 is opened on the downstream end surface 11 of the mandrel 3.
従って、エア供給孔10にダイス本体２の外径方向からエ
アが供給されれば、そのエアは、下流側端面11の流出口
10aから矢印の如く流出される。Therefore, when the air is supplied to the air supply hole 10 from the outer diameter direction of the die body 2, the air is discharged from the outlet of the downstream end face 11.
It flows out from 10a as shown by the arrow.
しかして、このダイス本体２は、第２図に示す様に、ニ
ップル１の下流側にマンドレル３…が配設されると共に
各マンドレル３…の軸心がダイス本体２の孔部22の軸心
と平行になるように、配設される。そして、マンドレル
３…の上流端3a…と、ニップル１の下流側先端1aとは、
所定間隔をもって対向し、この所定間隔の部分が樹脂合
流部Ｍとなる。In the die body 2, as shown in FIG. 2, mandrels 3 are arranged downstream of the nipple 1, and the axes of the mandrels 3 are the axes of the holes 22 of the die body 2. It is arranged so as to be parallel to. The upstream end 3a of the mandrel 3 and the downstream end 1a of the nipple 1 are
The portions facing each other at a predetermined interval serve as resin merging portions M at the predetermined intervals.
しかして、第２図に示す状態において、ニップル１の上
流側から樹脂が押出されれば、該樹脂はニップル１に案
内されながらダイス本体２の孔部22内に流入する。この
場合、該樹脂はニップル１の下流側先端1aとマンドレル
３の上流端3a…との間の樹脂合流部Ｍにおいて合流した
後、ダイス本体２の孔部22内に流入することになる。つ
まり、ダイス本体２の孔部22内での樹脂の流速は均等な
ものとなる。そして、樹脂は、各マンドレル３間を通過
しながら下流側先開口部18から押出される。また、押出
中に、エアをエア供給孔10に流入し、マンドレル３の下
流側端面11の流出口10aから流出させ、各孔部５の孔径
の精度を高めている。When the resin is extruded from the upstream side of the nipple 1 in the state shown in FIG. 2, the resin flows into the hole 22 of the die body 2 while being guided by the nipple 1. In this case, the resin flows into the hole 22 of the die body 2 after joining at the resin joining portion M between the downstream end 1a of the nipple 1 and the upstream end 3a of the mandrel 3. That is, the flow velocity of the resin in the hole 22 of the die body 2 becomes uniform. Then, the resin is extruded from the downstream end opening 18 while passing between the mandrels 3. Further, during the extrusion, air is introduced into the air supply hole 10 and is caused to flow out from the outflow port 10a of the downstream end face 11 of the mandrel 3, thereby improving the accuracy of the hole diameter of each hole 5.
従って、このダイスを使用すれば、第３図に示す様に、
寸法、形状が高精度の多孔チューブ４を形成することが
できる。けだし、ダイス本体２の孔部22内での流速は均
等なものとなり、しかも、各マンドレル３は腕部６によ
り所定の位置に保持されるので、各マンドレル３間、及
びダイス本体２の内周面2aとマンドレル３との間によっ
て形成されるチューブ４の各薄肉部21…等の肉厚寸法は
不均等なものとならないからである。また、実施例で
は、マンドレル３の上流端3aは丸味のある略円錐状とさ
れているので、ダイス本体２の孔部22内での樹脂の流速
は一層均等なものとなる。Therefore, if this die is used, as shown in FIG.
It is possible to form the perforated tube 4 having high precision in size and shape. The flow velocity in the hole 22 of the die body 2 is uniform, and since each mandrel 3 is held at a predetermined position by the arm portion 6, the mandrel 3 and the inner circumference of the die body 2 are held. This is because the thin-walled portions 21 ... Of the tube 4 formed between the surface 2a and the mandrel 3 do not have uneven thickness dimensions. Further, in the embodiment, since the upstream end 3a of the mandrel 3 has a rounded and substantially conical shape, the flow velocity of the resin in the hole 22 of the die body 2 becomes more uniform.
なお、本発明は上述の図例の実施例に限らず、本発明の
要旨を逸脱しない範囲で設計変更自由であり、例えば、
マンドレル３の数を増減させるも自由である。そして、
第２図におけるニップル１を全く省略しても良いことは
勿論である。The present invention is not limited to the embodiments of the above-described drawings, and the design can be freely changed without departing from the gist of the present invention.
You can increase or decrease the number of mandrels 3. And
Of course, the nipple 1 in FIG. 2 may be omitted altogether.
本発明は、上記のとおり構成されているので、次に記載
する効果を奏する。Since the present invention is configured as described above, it has the following effects.
ダイス本体２の孔部22内では樹脂の流速は均等なものと
なり、しかも、マンドレル３は腕部６に所定の位置に保
持されるので、各マンドレル３間、及びダイス本体２の
孔部22内周面22aとマンドレル３との間によって形成さ
れる多孔チューブ４の各薄肉部21…等の肉厚寸法は不均
等にならず、寸法・形状が高精度の多孔チューブ４が得
られる。従って、各種の樹脂においても常に高精度なも
のを製造することができ、特に肉厚寸法の差が激しく、
かつ、寸法精度の厳しい成形品に有効なものとなる。ま
た、マンドレル３の流出口10aからのエアにより、各孔
部５の孔径を高精度に形成することができる利点もあ
る。The resin flow velocity becomes uniform in the holes 22 of the die body 2, and moreover, the mandrel 3 is held at a predetermined position by the arm 6, so that the mandrel 3 is held between the mandrels 3 and the holes 22 of the die body 2. The thin wall portions 21 of the porous tube 4 formed between the peripheral surface 22a and the mandrel 3 do not have uneven thicknesses, and the porous tube 4 having a high precision in size and shape can be obtained. Therefore, it is possible to always manufacture high-precision products even with various types of resins, and the difference in wall thickness is particularly large.
In addition, it is effective for molded products with strict dimensional accuracy. There is also an advantage that the hole diameter of each hole 5 can be formed with high accuracy by the air from the outflow port 10a of the mandrel 3.
第１図は本発明の一実施例を示す断面正面図、第２図は
断面側面図、第３図は多孔チューブの拡大断面図であ
る。第４図は従来例の断面側面図である。 ２……ダイス本体、３……マンドレル、６……腕部、10
……エア供給孔、10a……流出口、11……下流側端面、2
2……孔部、22a……内周面。FIG. 1 is a sectional front view showing an embodiment of the present invention, FIG. 2 is a sectional side view, and FIG. 3 is an enlarged sectional view of a porous tube. FIG. 4 is a sectional side view of a conventional example. 2 ... Dice body, 3 ... Mandrel, 6 ... Arm, 10
...... Air supply hole, 10a ...... Outlet port, 11 ...... Downstream end face, 2
2 ... hole, 22a ... inner surface.
Claims (1)
突設すると共に該腕部の夫々の先端にマンドレルを連設
し、該マンドレルに、上記ダイス本体の外径方向からの
エアが上記腕部を介して供給されるエア供給孔を設ける
と共に、該エア供給孔の流出口を上記マンドレルの下流
側端面に開設したことを特徴とする多孔チューブ用ダイ
ス。1. A plurality of arms are provided so as to project from the inner peripheral surface of the hole of the die body, and a mandrel is continuously provided at the tip of each of the arms, and the mandrel is provided with air from the outer diameter direction of the die body. Is provided with an air supply hole to be supplied via the arm portion, and an outlet of the air supply hole is opened on the downstream end face of the mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087861A JPH0761671B2 (en) | 1988-04-08 | 1988-04-08 | Dies for perforated tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087861A JPH0761671B2 (en) | 1988-04-08 | 1988-04-08 | Dies for perforated tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01258928A JPH01258928A (en) | 1989-10-16 |
| JPH0761671B2 true JPH0761671B2 (en) | 1995-07-05 |
Family
ID=13926667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63087861A Expired - Lifetime JPH0761671B2 (en) | 1988-04-08 | 1988-04-08 | Dies for perforated tubes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761671B2 (en) |
-
1988
- 1988-04-08 JP JP63087861A patent/JPH0761671B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01258928A (en) | 1989-10-16 |
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