JP2808325B2 - Method for producing thermoplastic resin tube - Google Patents
Method for producing thermoplastic resin tubeInfo
- Publication number
- JP2808325B2 JP2808325B2 JP1255158A JP25515889A JP2808325B2 JP 2808325 B2 JP2808325 B2 JP 2808325B2 JP 1255158 A JP1255158 A JP 1255158A JP 25515889 A JP25515889 A JP 25515889A JP 2808325 B2 JP2808325 B2 JP 2808325B2
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- resin
- mandrel
- pin
- tube
- 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 - Fee Related
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
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- 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
- B29C48/06—Rod-shaped
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (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、複層のホースの内管等として用いられる熱
可塑性樹脂チューブの有利な製造方法に関する。Description: TECHNICAL FIELD The present invention relates to an advantageous method for producing a thermoplastic resin tube used as an inner tube of a multi-layer hose.
従来、熱可塑性樹脂押出機を用いて熱可塑性樹脂チュ
ーブを製造するに際し、熱可塑性樹脂チューブの偏肉防
止のために、熱可塑性樹脂マンドレルの外径とこの熱可
塑性樹脂マンドレルが通過する押出機のクロスヘッドの
ピンの内径との径差が0.5mm以下、好ましくは0.3mm以下
としていた。しかし、この場合、熱可塑性樹脂マンドレ
ルは、長尺物であって、ドラム巻き保管されるため、こ
の熱可塑性樹脂マンドレルに巻き癖が付き、クロスヘッ
ドのピンを通過する際にピンに接触してしまう。このた
め、ピンが冷却され、これによりピン表面の溶融樹脂が
冷却され、樹脂の流動性が変り、得られる熱可塑性樹脂
チューブの品質が安定しなくなってしまう。一方、ピン
に接触する熱可塑性樹脂マンドレルはピンからの熱伝導
により熱損傷を受け、この結果、熱可塑性樹脂マンドレ
ルのリサイクル（繰返し使用）性に支障を来すと伴に、
熱可塑性樹脂マンドレルと熱可塑性樹脂チューブとが融
着して熱可塑性樹脂マンドレルが抜けなくなることがあ
る。Conventionally, when manufacturing a thermoplastic resin tube using a thermoplastic resin extruder, in order to prevent uneven thickness of the thermoplastic resin tube, the outer diameter of the thermoplastic resin mandrel and the extruder through which the thermoplastic resin mandrel passes. The diameter difference from the inner diameter of the pin of the crosshead is 0.5 mm or less, preferably 0.3 mm or less. However, in this case, the thermoplastic resin mandrel is a long object and is stored in a drum wound state.Therefore, the thermoplastic resin mandrel has a curl and comes into contact with the pin when passing through the pin of the crosshead. I will. For this reason, the pin is cooled, whereby the molten resin on the pin surface is cooled, the fluidity of the resin changes, and the quality of the obtained thermoplastic resin tube becomes unstable. On the other hand, the thermoplastic resin mandrel that contacts the pin is thermally damaged by heat conduction from the pin, and as a result, the recyclability (repeated use) of the thermoplastic resin mandrel is hindered,
In some cases, the thermoplastic resin mandrel and the thermoplastic resin tube are fused and the thermoplastic resin mandrel cannot be removed.
本発明は、このような事情にかんがみなされたもので
あって、熱可塑性樹脂押出機を用いて熱可塑性樹脂チュ
ーブを製造するに際し、この押出機のクロスヘッドのピ
ンの冷却を防止すると共に熱可塑性樹脂マンドレルの熱
損傷を解消した、熱可塑性チューブの製造方法を提供す
ることを目的とする。The present invention has been made in view of such circumstances, and when manufacturing a thermoplastic resin tube using a thermoplastic resin extruder, it is possible to prevent cooling of a pin of a crosshead of the extruder and to prevent thermoplasticity. An object of the present invention is to provide a method for manufacturing a thermoplastic tube in which thermal damage to a resin mandrel is eliminated.
本発明の熱可塑性樹脂チューブの製造方法は、中空円
筒状のピンの外側に中空円筒状のダイを設けたクロスヘ
ッドを有し、前記ピン内には熱可塑性樹脂マンドレルが
挿入された外部の熱可塑性樹脂マンドレル送り込みキャ
タピラーの駆動により該マンドレルがその軸方向に移動
可能となっていて、前記ピンと前記ダイとの間には溶融
した熱可塑性樹脂が流動する熱可塑性樹脂押出機を用い
て、該押出機のクロスヘッドから熱可塑性樹脂を熱可塑
性樹脂マンドレル上に押し出して熱可塑性樹脂チューブ
を形成せしめ、この熱可塑性樹脂チューブを外部の熱可
塑性樹脂チューブ引取りキャタピラーの駆動により回収
するに際し、前記熱可塑性樹脂マンドレルの外径と前記
ピンの内径との径差を1.0mm〜10mmとすると共に、前記
熱可塑性樹脂チューブ引取りキャタピラーの駆動速度を
前記熱可塑性樹脂マンドレル送り込みキャタピラーの駆
動速度よりも0.3m/分以下大きくしたことを特徴とす
る。The method for producing a thermoplastic resin tube of the present invention includes a crosshead having a hollow cylindrical die provided outside a hollow cylindrical pin, and an external heat source in which a thermoplastic resin mandrel is inserted inside the pin. The mandrel can be moved in the axial direction by driving a plastic resin mandrel feeding caterpillar, and the extruding is performed using a thermoplastic resin extruder in which a molten thermoplastic resin flows between the pin and the die. The thermoplastic resin is extruded from the crosshead of the machine onto the thermoplastic resin mandrel to form a thermoplastic resin tube, and when the thermoplastic resin tube is collected by driving an external thermoplastic resin tube take-off caterpillar, the thermoplastic resin is removed. The diameter difference between the outer diameter of the resin mandrel and the inner diameter of the pin is set to 1.0 mm to 10 mm, and the thermoplastic resin tube is drawn. Ri the driving speed of the Caterpillar, characterized in that the large 0.3 m / min or less than the driving speed of the thermoplastic resin mandrel infeed Caterpillar.
以下、図を参照してこの手段につき詳しく説明する。 Hereinafter, this means will be described in detail with reference to the drawings.
図は本発明で用いる熱可塑性樹脂押出機のクロスヘッ
ドの一部切り欠き側面視断面説明図である。この図にお
いて、クロスヘッドＴは中空円筒状のピン１とこの外側
に設けられた中空円筒状のダイ２からなる。ピン１の内
には熱可塑性樹脂マンドレル（以下、樹脂マンドレルと
いう）３が挿入され、外部の熱可塑性樹脂マンドレル送
り込みキャタピラー（図示せず）の駆動により、その軸
方向、すなわち矢印Ｍの方向に連続的に移動可能となっ
ている。樹脂マドレル３の表面には、通常、離型剤が塗
布されている。４はダイバーである、Ａはピン１の外
径、Ｂはダイ２の内径、Ｃはピン１の内径、Ｄは樹脂マ
ンドレル３の外径である。The figure is a partially cutaway side view sectional view of a crosshead of a thermoplastic resin extruder used in the present invention. In this figure, a crosshead T comprises a hollow cylindrical pin 1 and a hollow cylindrical die 2 provided outside the pin. A thermoplastic resin mandrel (hereinafter referred to as “resin mandrel”) 3 is inserted into the pin 1, and driven continuously by an external thermoplastic resin mandrel feeding caterpillar (not shown) in its axial direction, that is, in the direction of arrow M. It is movable. A release agent is usually applied to the surface of the resin mandrel 3. 4 is a diver, A is the outer diameter of the pin 1, B is the inner diameter of the die 2, C is the inner diameter of the pin 1, and D is the outer diameter of the resin mandrel 3.
この押出機を用いて熱可塑性樹脂チュープ（以下、樹
脂チューブという）を製造するに際しては、ピン１とダ
イ２との間に流動する溶融した熱可塑性樹脂、すなわち
溶融樹脂５をクロスヘッドＴから樹脂マンドレル３上に
押し出して樹脂チューブ６を連続的に形成させる。この
樹脂チューブ６は、外部の熱可塑性樹脂チューブ引取り
キャタピラー（図示せず）の駆動により連続的に回収さ
れる。得られた樹脂チューブ６の外周面に公知の手法に
て補強層、ゴム製外管等を被覆し、これらを最終的に一
体加硫することにより複層ホースを得ることができる。When a thermoplastic resin tube (hereinafter, referred to as a resin tube) is manufactured using this extruder, a molten thermoplastic resin flowing between the pin 1 and the die 2, that is, The resin tube 6 is extruded onto the mandrel 3 to be continuously formed. The resin tube 6 is continuously collected by driving an external thermoplastic resin tube take-off caterpillar (not shown). A multi-layer hose can be obtained by coating the outer peripheral surface of the obtained resin tube 6 with a reinforcing layer, a rubber outer tube and the like by a known method, and finally vulcanizing them integrally.
本発明では樹脂マンドレル３の外径Ｄとピン１の内径
Ｃとの径差（Ｃ−Ｄ）を1.0mm〜10mmとすると共に、樹
脂マンドレル送り込みキャタピラーと樹脂チューブ引取
りキャタピラーとの間に0.3m/分以下の駆動速度差（樹
脂マンドレルと樹脂チューブとの移動速度差）を設け、
かつ樹脂チューブ引取りキャタピラーの駆動速度の方を
大きくする。これは、以下の理由からである。In the present invention, the diameter difference (CD) between the outer diameter D of the resin mandrel 3 and the inner diameter C of the pin 1 is set to 1.0 mm to 10 mm, and the distance between the resin mandrel feeding caterpillar and the resin tube pulling caterpillar is 0.3 m. / Min drive speed difference (movement speed difference between resin mandrel and resin tube)
In addition, the driving speed of the caterpillar for taking the resin tube is increased. This is for the following reason.
ゴムホースやゴムと熱可塑性樹脂の複層ホースの製造
に使用される樹脂マンドレル３には、耐熱性、柔軟性を
理由に６−ナイロン、66−ナイロン、11−ナイロン、12
−ナイロン、ポリエステル樹脂、ポリテトラメチルヘン
テン樹脂等が一般的に用いられる。一方、樹脂チューブ
６の素材には、ホースの柔軟性を理由に、曲げ弾性率70
00kgf/cm2以下、一般的には5000kgf/cm2以下のもの、具
体的には各種要求性能に応じて、６−ナイロン、66−ナ
イロン、11−ナイロン、12−ナイロン、各種共重合ナイ
ロン、各種ブレンドナイロン、変性ナイロン等のナイロ
ン樹脂、ウレタン樹脂、塩化ビニル樹脂、ポリエステル
エラストマー樹脂、フッ素樹脂等が一般的に使用され
る。樹脂チューブ６の素材の押出成型温度は少なくとも
200℃前後以上を必要とするため、樹脂マンドレル３が
樹脂チューブ６の成型用クロスヘッドＴのピン１に内接
触すれば、樹脂マンドレル３の熱損傷が免れない。さら
に、樹脂マンドレル３のピン１内の樹脂マンドレル３の
ピン１への接触でピン１が冷却される。しかも図に示す
如く、クロスヘッドＴの構造上、ピン１を直接加熱制御
することは一般的にできない。したがって、ピン１が冷
却されるとダイ２とピン１の間から吐出される溶融樹脂
５はピン１の表面で冷却され、溶融樹脂５の高粘度化が
起り、その冷却が進むにつれて樹脂チューブ６の引落し
成型が困難になる。すなわち、樹脂マンドレル３をクロ
スヘッドＴに通さない状態で溶融樹脂５を吐出させる突
出しでは、高粘度樹脂は吐出されず、樹脂マンドレル３
をクロスヘッドＴに通した場合、ピン１が樹脂マンドレ
ル３に冷却されると高粘度樹脂の吐出を誘発し樹脂チュ
ーブ６の成型が不能に至る。The resin mandrel 3 used in the production of rubber hoses or multi-layer hoses of rubber and thermoplastic resin includes 6-nylon, 66-nylon, 11-nylon, 12-nylon for reasons of heat resistance and flexibility.
-Nylon, polyester resin, polytetramethylhenten resin and the like are generally used. On the other hand, the material of the resin tube 6 has a flexural modulus of 70 due to the flexibility of the hose.
00 kgf / cm 2 or less, generally 5000 kgf / cm 2 or less, specifically, according to various required performances, 6-nylon, 66-nylon, 11-nylon, 12-nylon, various copolymer nylon, Nylon resins such as various kinds of blended nylons and modified nylons, urethane resins, vinyl chloride resins, polyester elastomer resins, fluorine resins and the like are generally used. The extrusion temperature of the material of the resin tube 6 is at least
Since the temperature of about 200 ° C. or more is required, if the resin mandrel 3 comes into contact with the pin 1 of the molding crosshead T of the resin tube 6, thermal damage to the resin mandrel 3 is unavoidable. Further, the pin 1 is cooled by the contact of the resin mandrel 3 with the pin 1 in the pin 1 of the resin mandrel 3. Moreover, as shown in the figure, it is generally not possible to directly control the heating of the pin 1 due to the structure of the crosshead T. Therefore, when the pin 1 is cooled, the molten resin 5 discharged from between the die 2 and the pin 1 is cooled on the surface of the pin 1, and the viscosity of the molten resin 5 increases. It becomes difficult to draw down. That is, in the case of projecting the molten resin 5 in a state where the resin mandrel 3 is not passed through the crosshead T, the high-viscosity resin is not discharged, and
Is passed through the crosshead T, when the pin 1 is cooled by the resin mandrel 3, the ejection of the high-viscosity resin is induced, and the molding of the resin tube 6 becomes impossible.
他方、ホースの成型は一般的に、100m/本以上の長さ
の樹脂マンドレル３を使用する。樹脂マンドレル３の保
管およびホース製造工程では樹脂マンドレル３をドラム
巻きにするのが通常で、このため樹脂マンドレル３の曲
り癖は免れず、曲り癖を許容できる樹脂チューブ６の連
続製造方法が強く望まれていた。曲り癖は前記の如く、
ピン１に対する樹脂マンドレル３の芯出し阻害およびピ
ン１の冷却に影響を及ぼす。本発明者らは、両者を回避
する樹脂チューブ６の連続製造方法を鋭意研究し、本発
明をなすに至った。On the other hand, the molding of the hose generally uses a resin mandrel 3 having a length of 100 m / piece or more. In the process of storing the resin mandrel 3 and the hose manufacturing process, the resin mandrel 3 is usually wound around a drum. Therefore, a curving habit of the resin mandrel 3 is inevitable. Was rare. The bending habit is as described above,
It has an effect on centering of the resin mandrel 3 with respect to the pin 1 and cooling of the pin 1. The present inventors have conducted intensive research on a continuous production method of the resin tube 6 that avoids both, and have accomplished the present invention.
特公昭63−45302号公報には、樹脂マンドレル３を予
備加熱する手法が開示されている。しかし、この場合、
高粘度樹脂の吐出がわずかに遅れる効果は有ったが連続
生産にはほど遠い。本発明者らは、種々研究した中で、
樹脂マンドレル３が通過するピン１の内径と樹脂マンド
レル３の外径の差（以下、径差と略す）が最も影響を及
ぼすことを発見した。径差（Ｃ−Ｄ）が0.5mm以下では
高粘度樹脂の吐出は解消されず、0.8mmにすると改善効
果がある。しかし、樹脂マンドレル３の曲り癖があるた
め、樹脂マンドレル３がピン１を出た所で踊る現象が発
生し、樹脂マンドレル３の芯出しが困難となる。樹脂マ
ンドレル３の曲り癖はキャタピラー（樹脂マンドレル送
り込みキャタピラーと樹脂チューブ引取りキャタピラ
ー）間に駆動速度差を設け、かつ樹脂チューブ引取りキ
ャタピラーの駆動速度の方を大きくすることで改善さ
れ、少なくとも大きな曲り癖は解消できる。しかし、キ
ャタピラー間の駆動速度差を大きくするとキャタピラー
ベルトと樹脂チューブ６との間でスベリが発生し、樹脂
チューブ６の損傷が発生する。樹脂マンドレル３の大き
な曲り癖を矯正するのにキャタピラー間の駆動速度差、
換言すれば樹脂マンドレル３と樹脂チューブ６との移動
速度差は0.3m/分以下で充分であり、樹脂チューブ６の
損傷も無く、樹脂マンドレル３の芯出しも可能となる。
キャタピラー間の駆動速度差を0.3m/分以下とし、径差
を0.8mmにすると改善効果はあるが充分で無く、徐々に
ピン１が冷却され、樹脂チューブ６の連続生産には不向
きである。径差を1.0mm以上にすると、ピン１の冷却現
象が著しく改善され、少なくとも1000m〜10000mの連続
生産が可能となる。さらに樹脂マンドレル３のピン１へ
の接触を防止し、安定した連続生産をするためには径差
を1.2mm以上とするのが好ましい。ただし、樹脂チュー
ブ６の引落し率に限界があることおよびピン１の樹脂圧
力に対する機械的強度を考慮すると、径差は10mm以下と
するのがよい。JP-B-63-45302 discloses a method of preheating the resin mandrel 3. But in this case,
Although the effect of slightly delaying the discharge of high-viscosity resin was obtained, it is far from continuous production. The present inventors have studied variously,
It has been discovered that the difference between the inner diameter of the pin 1 through which the resin mandrel 3 passes and the outer diameter of the resin mandrel 3 (hereinafter, abbreviated as the diameter difference) has the greatest effect. When the diameter difference (CD) is 0.5 mm or less, the ejection of the high-viscosity resin is not eliminated, and when the diameter difference is 0.8 mm, there is an improvement effect. However, since the resin mandrel 3 has a bending habit, a phenomenon occurs in which the resin mandrel 3 dances when it comes out of the pin 1, and it becomes difficult to center the resin mandrel 3. The bending tendency of the resin mandrel 3 is improved by providing a driving speed difference between the caterpillars (the resin mandrel feeding caterpillar and the resin tube pulling caterpillar) and increasing the driving speed of the resin tube pulling caterpillar. Habit can be resolved. However, when the driving speed difference between the caterpillars is increased, slippage occurs between the caterpillar belt and the resin tube 6, and the resin tube 6 is damaged. In order to correct a large bending habit of the resin mandrel 3, a driving speed difference between the caterpillars,
In other words, the difference between the moving speeds of the resin mandrel 3 and the resin tube 6 is not more than 0.3 m / min, so that the resin tube 6 is not damaged and the resin mandrel 3 can be centered.
When the difference in driving speed between the caterpillars is set to 0.3 m / min or less and the difference in diameter is set to 0.8 mm, the effect of improvement is not sufficient but the pin 1 is gradually cooled, which is not suitable for continuous production of the resin tube 6. When the diameter difference is 1.0 mm or more, the cooling phenomenon of the pin 1 is remarkably improved, and continuous production of at least 1000 m to 10,000 m becomes possible. Further, in order to prevent the resin mandrel 3 from coming into contact with the pin 1 and to achieve stable continuous production, it is preferable that the diameter difference is 1.2 mm or more. However, considering that there is a limit to the pull-down rate of the resin tube 6 and the mechanical strength of the pin 1 with respect to the resin pressure, the diameter difference is preferably 10 mm or less.
以下に本発明を示す。 The present invention will be described below.
実施例 下記の条件のもとに樹脂チューブの押出成型を行っ
た。Example A resin tube was extruded under the following conditions.
押出機：樹脂押出機（直径40mm） 樹脂マンドレル：ナイロン−11、外径10.8mm、シリコン
離型剤処理 樹脂チューブ：ナイロン−６、内径約10.8mm、肉厚0.2m
m ピン先端樹脂温:260℃設定（樹脂空出時） 樹脂マンドレル送り込みキャタピラー速度:6.0m/分 クロスヘッド：図 上記条件の基に樹脂マンドレルの大きな曲り癖の矯正
を目的に樹脂チューブ引取りキャタピラー速度を6.0m/
分以上とし、駆動速度差の検討を行った。Extruder: Resin extruder (diameter 40mm) Resin mandrel: Nylon-11, outer diameter 10.8mm, silicone release agent treatment Resin tube: Nylon-6, inner diameter about 10.8mm, wall thickness 0.2m
m Pin tip resin temperature: 260 ° C (when resin is empty) Resin mandrel feed caterpillar speed: 6.0m / min Crosshead: Figure Under the above conditions, a resin tube pulling caterpillar is used to correct large bending habits of the resin mandrel. 6.0m / speed
Minutes or more, and the drive speed difference was examined.
この結果を第１表に示す。 Table 1 shows the results.
また、第１表における樹脂チューブの偏肉測定は、高
粘度樹脂が吐出される前に成型したチューブを切り出
し、チューブの周方向に８等分した位置の肉厚をマイク
ロメーターを用いて測定した。８点測定値の最大値と最
小値の差を樹脂チューブの偏肉とし、チューブ長手方向
にランダムに５ヶ所測定し、平均値を第１表に示した。In the measurement of uneven thickness of the resin tube in Table 1, the molded tube was cut out before the high-viscosity resin was discharged, and the thickness of the tube at a position equally divided into eight in the circumferential direction was measured using a micrometer. . The difference between the maximum value and the minimum value of the eight measured values was taken as the unevenness of the thickness of the resin tube, and measured at five places in the longitudinal direction of the tube at random. The average value was shown in Table 1.
第１表から、駆動速度差は0.3m/分以下がよいことを
判る。ただし、0.0m/分を除く。From Table 1, it can be seen that the difference in driving speed is preferably 0.3 m / min or less. However, excluding 0.0m / min.
次に、駆動速度差を0.1m/分に設定し、径差の検討を
繰返数３で行い、第２表の結果を得た。第２表中、樹脂
チューブ成型不能点とは、成型樹脂チューブが高粘度樹
脂吐出のために、樹脂が変形した点で、樹脂チューブ成
型長さを単位とした。また、ピン先端樹脂温度とは、樹
脂チューブ成型不能点での針型熱電対を用いて測定した
樹脂温度で、成型不能点の無い場合は樹脂チューブ成型
終了時点で測定した。 Next, the driving speed difference was set to 0.1 m / min, and the diameter difference was examined at a repetition number of 3 to obtain the results shown in Table 2. In Table 2, the point at which the resin tube cannot be molded is a point at which the resin is deformed due to the ejection of the high-viscosity resin from the molded resin tube. The pin tip resin temperature was a resin temperature measured using a needle type thermocouple at a resin tube molding impossible point, and was measured at the end of resin tube molding when there was no molding impossible point.
第２表から、径差が1.0〜10.0mmにおいて全てに良い
ことが判る。From Table 2, it can be seen that everything is good when the diameter difference is 1.0 to 10.0 mm.
〔発明の効果〕 以上説明したように本発明によれば、樹脂マンドレル
によるピンの冷却を防止することができるので、高粘度
樹脂の吐出が未然防止されるため、品質の安定した樹脂
チューブの連続生産が可能となる。さらに、本発明によ
れば、樹脂マンドレルの熱損傷、樹脂チューブのスベリ
損傷等の防止、および樹脂マンドレルの芯出しができ、
樹脂チューブの偏肉を0.05mm以下に出来る等の利点があ
る。 [Effects of the Invention] As described above, according to the present invention, the cooling of the pin by the resin mandrel can be prevented, so that the ejection of the high-viscosity resin is prevented beforehand. Production becomes possible. Furthermore, according to the present invention, heat damage of the resin mandrel, prevention of slip damage of the resin tube, and centering of the resin mandrel can be performed,
There are advantages such as the uneven thickness of the resin tube can be reduced to 0.05 mm or less.
図は本発明で用いる熱可塑性樹脂押出機のクロスヘッド
の一部切り欠き側面視断面説明図である。 １……ピン、２……ダイ、３……樹脂マンドレル、４…
…ダイカバー、５……溶融樹脂、６……樹脂チューブ、
Ｔ……クロスヘッド。The figure is a partially cutaway side view sectional view of a crosshead of a thermoplastic resin extruder used in the present invention. 1 ... pin, 2 ... die, 3 ... resin mandrel, 4 ...
... die cover, 5 ... molten resin, 6 ... resin tube,
T ... Crosshead.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 47/00 - 47/96 B29D 1/00 - 31/02 B29C 33/00 - 35/18──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B29C 47/00-47/96 B29D 1/00-31/02 B29C 33/00-35/18
Claims (1)
イを設けたクロスヘッドを有し、前記ピン内には熱可塑
性樹脂マンドレルが挿入されて外部の熱可塑性樹脂マン
ドレル送り込みキャタピラーの駆動により該マンドレル
がその軸方向に移動可能となっていて、前記ピンと前記
ダイとの間には溶融した熱可塑性樹脂が流動する熱可塑
性樹脂押出機を用いて、該押出機のクロスヘッドから熱
可塑性樹脂を熱可塑性樹脂マンドレル上に押し出して熱
可塑性樹脂チューブを形成せしめ、この熱可塑性樹脂チ
ューブを外部の熱可塑性樹脂チューブ引取りキャタピラ
ーの駆動により回収する方法において、前記熱可塑性樹
脂マンドレルの外径と前記ピンの内径との径差を1.0mm
〜10mmとすると共に、前記熱可塑性樹脂チューブ引取り
キャタピラーの駆動速度を前記熱可塑性樹脂マンドレル
送り込みキャタピラーの駆動速度よりも0.3m/分以下大
きくしたことを特徴とする熱可塑性樹脂チューブの製造
方法。1. A cross head having a hollow cylindrical die outside a hollow cylindrical pin, wherein a thermoplastic resin mandrel is inserted into the pin to drive an external thermoplastic resin mandrel feeding caterpillar. The mandrel can be moved in the axial direction by using a thermoplastic resin extruder in which a molten thermoplastic resin flows between the pin and the die, and a thermoplastic resin is extruded from a crosshead of the extruder. In a method of extruding a resin onto a thermoplastic resin mandrel to form a thermoplastic resin tube, and recovering the thermoplastic resin tube by driving an external thermoplastic resin tube take-off caterpillar, the outer diameter of the thermoplastic resin mandrel and 1.0mm diameter difference from the inner diameter of the pin
A method for manufacturing a thermoplastic resin tube, wherein the driving speed of the caterpillar for taking the thermoplastic resin tube is 0.3 m / min or less than the driving speed of the caterpillar for feeding the thermoplastic resin mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1255158A JP2808325B2 (en) | 1989-10-02 | 1989-10-02 | Method for producing thermoplastic resin tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1255158A JP2808325B2 (en) | 1989-10-02 | 1989-10-02 | Method for producing thermoplastic resin tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03118135A JPH03118135A (en) | 1991-05-20 |
| JP2808325B2 true JP2808325B2 (en) | 1998-10-08 |
Family
ID=17274870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1255158A Expired - Fee Related JP2808325B2 (en) | 1989-10-02 | 1989-10-02 | Method for producing thermoplastic resin tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2808325B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008136524A (en) * | 2006-11-30 | 2008-06-19 | Sri Sports Ltd | Putter type golf club |
-
1989
- 1989-10-02 JP JP1255158A patent/JP2808325B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03118135A (en) | 1991-05-20 |
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